ViewGroup.java revision b051e895ccb696604349c6c5efe7c4747e1d1ab6
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 = 0x200000; 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; 907 908 for (int i = count - 1; i >= 0; i--) { 909 final View child = children[i]; 910 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 911 || child.getAnimation() != null) { 912 // Single dispatch always picks its target based on the initial down 913 // event's position - index 0 914 if (dispatchTouchEventIfInView(child, ev, 0)) { 915 mMotionTarget = child; 916 return true; 917 } 918 } 919 } 920 } 921 } 922 923 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 924 (action == MotionEvent.ACTION_CANCEL); 925 926 if (isUpOrCancel) { 927 // Note, we've already copied the previous state to our local 928 // variable, so this takes effect on the next event 929 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 930 } 931 932 // The event wasn't an ACTION_DOWN, dispatch it to our target if 933 // we have one. 934 final View target = mMotionTarget; 935 if (target == null) { 936 // We don't have a target, this means we're handling the 937 // event as a regular view. 938 ev.setLocation(xf, yf); 939 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 940 ev.setAction(MotionEvent.ACTION_CANCEL); 941 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 942 } 943 return super.dispatchTouchEvent(ev); 944 } 945 946 // Calculate the offset point into the target's local coordinates 947 float xc = scrolledXFloat - (float) target.mLeft; 948 float yc = scrolledYFloat - (float) target.mTop; 949 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 950 // non-identity matrix: transform the point into the view's coordinates 951 final float[] localXY = mAttachInfo.mTmpTransformLocation; 952 localXY[0] = xc; 953 localXY[1] = yc; 954 target.getInverseMatrix().mapPoints(localXY); 955 xc = localXY[0]; 956 yc = localXY[1]; 957 } 958 959 // if have a target, see if we're allowed to and want to intercept its 960 // events 961 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 962 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 963 ev.setAction(MotionEvent.ACTION_CANCEL); 964 ev.setLocation(xc, yc); 965 if (!target.dispatchTouchEvent(ev)) { 966 // target didn't handle ACTION_CANCEL. not much we can do 967 // but they should have. 968 } 969 // clear the target 970 mMotionTarget = null; 971 // Don't dispatch this event to our own view, because we already 972 // saw it when intercepting; we just want to give the following 973 // event to the normal onTouchEvent(). 974 return true; 975 } 976 977 if (isUpOrCancel) { 978 mMotionTarget = null; 979 } 980 981 // finally offset the event to the target's coordinate system and 982 // dispatch the event. 983 ev.setLocation(xc, yc); 984 985 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 986 ev.setAction(MotionEvent.ACTION_CANCEL); 987 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 988 mMotionTarget = null; 989 } 990 991 if (target.dispatchTouchEvent(ev)) { 992 return true; 993 } else { 994 ev.setLocation(xf, yf); 995 } 996 return false; 997 } 998 999 /** 1000 * This method detects whether the pointer location at <code>pointerIndex</code> within 1001 * <code>ev</code> is inside the specified view. If so, the transformed event is dispatched to 1002 * <code>child</code>. 1003 * 1004 * @param child View to hit test against 1005 * @param ev MotionEvent to test 1006 * @param pointerIndex Index of the pointer within <code>ev</code> to test 1007 * @return <code>false</code> if the hit test failed, or the result of 1008 * <code>child.dispatchTouchEvent</code> 1009 */ 1010 private boolean dispatchTouchEventIfInView(View child, MotionEvent ev, int pointerIndex) { 1011 final float x = ev.getX(pointerIndex); 1012 final float y = ev.getY(pointerIndex); 1013 final float scrolledX = x + mScrollX; 1014 final float scrolledY = y + mScrollY; 1015 float localX = scrolledX - child.mLeft; 1016 float localY = scrolledY - child.mTop; 1017 if (!child.hasIdentityMatrix() && mAttachInfo != null) { 1018 // non-identity matrix: transform the point into the view's coordinates 1019 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1020 localXY[0] = localX; 1021 localXY[1] = localY; 1022 child.getInverseMatrix().mapPoints(localXY); 1023 localX = localXY[0]; 1024 localY = localXY[1]; 1025 } 1026 if (localX >= 0 && localY >= 0 && localX < (child.mRight - child.mLeft) && 1027 localY < (child.mBottom - child.mTop)) { 1028 // It would be safer to clone the event here but we don't for performance. 1029 // There are many subtle interactions in touch event dispatch; change at your own risk. 1030 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1031 ev.offsetLocation(localX - x, localY - y); 1032 if (child.dispatchTouchEvent(ev)) { 1033 return true; 1034 } else { 1035 ev.offsetLocation(x - localX, y - localY); 1036 return false; 1037 } 1038 } 1039 return false; 1040 } 1041 1042 private boolean dispatchSplitTouchEvent(MotionEvent ev) { 1043 final SplitMotionTargets targets = mSplitMotionTargets; 1044 final int action = ev.getAction(); 1045 final int maskedAction = ev.getActionMasked(); 1046 float xf = ev.getX(); 1047 float yf = ev.getY(); 1048 float scrolledXFloat = xf + mScrollX; 1049 float scrolledYFloat = yf + mScrollY; 1050 1051 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1052 1053 if (maskedAction == MotionEvent.ACTION_DOWN || 1054 maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 1055 final int actionIndex = ev.getActionIndex(); 1056 final int actionId = ev.getPointerId(actionIndex); 1057 1058 // Clear out any current target for this ID. 1059 // XXX: We should probably send an ACTION_UP to the current 1060 // target if present. 1061 targets.removeById(actionId); 1062 1063 // If we're disallowing intercept or if we're allowing and we didn't 1064 // intercept 1065 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 1066 // reset this event's action (just to protect ourselves) 1067 ev.setAction(action); 1068 // We know we want to dispatch the event down, try to find a child 1069 // who can handle it, start with the front-most child. 1070 final long downTime = ev.getEventTime(); 1071 final View[] children = mChildren; 1072 final int count = mChildrenCount; 1073 for (int i = count - 1; i >= 0; i--) { 1074 final View child = children[i]; 1075 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1076 || child.getAnimation() != null) { 1077 final MotionEvent childEvent = 1078 targets.filterMotionEventForChild(ev, child, downTime); 1079 if (childEvent != null) { 1080 try { 1081 final int childActionIndex = childEvent.findPointerIndex(actionId); 1082 if (dispatchTouchEventIfInView(child, childEvent, 1083 childActionIndex)) { 1084 targets.add(actionId, child, downTime); 1085 1086 return true; 1087 } 1088 } finally { 1089 childEvent.recycle(); 1090 } 1091 } 1092 } 1093 } 1094 1095 // Didn't find a new target. Do we have a "primary" target to send to? 1096 final SplitMotionTargets.TargetInfo primaryTargetInfo = targets.getPrimaryTarget(); 1097 if (primaryTargetInfo != null) { 1098 final View primaryTarget = primaryTargetInfo.view; 1099 final MotionEvent childEvent = targets.filterMotionEventForChild(ev, 1100 primaryTarget, primaryTargetInfo.downTime); 1101 if (childEvent != null) { 1102 try { 1103 // Calculate the offset point into the target's local coordinates 1104 float xc = scrolledXFloat - (float) primaryTarget.mLeft; 1105 float yc = scrolledYFloat - (float) primaryTarget.mTop; 1106 if (!primaryTarget.hasIdentityMatrix() && mAttachInfo != null) { 1107 // non-identity matrix: transform the point into the view's 1108 // coordinates 1109 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1110 localXY[0] = xc; 1111 localXY[1] = yc; 1112 primaryTarget.getInverseMatrix().mapPoints(localXY); 1113 xc = localXY[0]; 1114 yc = localXY[1]; 1115 } 1116 childEvent.setLocation(xc, yc); 1117 if (primaryTarget.dispatchTouchEvent(childEvent)) { 1118 targets.add(actionId, primaryTarget, primaryTargetInfo.downTime); 1119 return true; 1120 } 1121 } finally { 1122 childEvent.recycle(); 1123 } 1124 } 1125 } 1126 } 1127 } 1128 1129 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 1130 (action == MotionEvent.ACTION_CANCEL); 1131 1132 if (isUpOrCancel) { 1133 // Note, we've already copied the previous state to our local 1134 // variable, so this takes effect on the next event 1135 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1136 } 1137 1138 if (targets.isEmpty()) { 1139 // We don't have any targets, this means we're handling the 1140 // event as a regular view. 1141 ev.setLocation(xf, yf); 1142 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1143 ev.setAction(MotionEvent.ACTION_CANCEL); 1144 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1145 } 1146 return super.dispatchTouchEvent(ev); 1147 } 1148 1149 // if we have targets, see if we're allowed to and want to intercept their 1150 // events 1151 int uniqueTargetCount = targets.getUniqueTargetCount(); 1152 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 1153 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1154 1155 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1156 final View target = targets.getUniqueTargetAt(uniqueIndex).view; 1157 1158 // Calculate the offset point into the target's local coordinates 1159 float xc = scrolledXFloat - (float) target.mLeft; 1160 float yc = scrolledYFloat - (float) target.mTop; 1161 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1162 // non-identity matrix: transform the point into the view's coordinates 1163 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1164 localXY[0] = xc; 1165 localXY[1] = yc; 1166 target.getInverseMatrix().mapPoints(localXY); 1167 xc = localXY[0]; 1168 yc = localXY[1]; 1169 } 1170 1171 ev.setAction(MotionEvent.ACTION_CANCEL); 1172 ev.setLocation(xc, yc); 1173 if (!target.dispatchTouchEvent(ev)) { 1174 // target didn't handle ACTION_CANCEL. not much we can do 1175 // but they should have. 1176 } 1177 } 1178 targets.clear(); 1179 // Don't dispatch this event to our own view, because we already 1180 // saw it when intercepting; we just want to give the following 1181 // event to the normal onTouchEvent(). 1182 return true; 1183 } 1184 1185 boolean handled = false; 1186 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1187 final SplitMotionTargets.TargetInfo targetInfo = targets.getUniqueTargetAt(uniqueIndex); 1188 final View target = targetInfo.view; 1189 1190 final MotionEvent targetEvent = 1191 targets.filterMotionEventForChild(ev, target, targetInfo.downTime); 1192 if (targetEvent == null) { 1193 continue; 1194 } 1195 1196 try { 1197 // Calculate the offset point into the target's local coordinates 1198 xf = targetEvent.getX(); 1199 yf = targetEvent.getY(); 1200 scrolledXFloat = xf + mScrollX; 1201 scrolledYFloat = yf + mScrollY; 1202 float xc = scrolledXFloat - (float) target.mLeft; 1203 float yc = scrolledYFloat - (float) target.mTop; 1204 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1205 // non-identity matrix: transform the point into the view's coordinates 1206 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1207 localXY[0] = xc; 1208 localXY[1] = yc; 1209 target.getInverseMatrix().mapPoints(localXY); 1210 xc = localXY[0]; 1211 yc = localXY[1]; 1212 } 1213 1214 // finally offset the event to the target's coordinate system and 1215 // dispatch the event. 1216 targetEvent.setLocation(xc, yc); 1217 1218 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1219 targetEvent.setAction(MotionEvent.ACTION_CANCEL); 1220 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1221 targets.removeView(target); 1222 uniqueIndex--; 1223 uniqueTargetCount--; 1224 } 1225 1226 handled |= target.dispatchTouchEvent(targetEvent); 1227 } finally { 1228 targetEvent.recycle(); 1229 } 1230 } 1231 1232 if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 1233 final int removeId = ev.getPointerId(ev.getActionIndex()); 1234 targets.removeById(removeId); 1235 } 1236 1237 if (isUpOrCancel) { 1238 targets.clear(); 1239 } 1240 1241 return handled; 1242 } 1243 1244 /** 1245 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1246 * dispatch. This behavior is disabled by default. 1247 * 1248 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1249 * views depending on where each pointer initially went down. This allows for user interactions 1250 * such as scrolling two panes of content independently, chording of buttons, and performing 1251 * independent gestures on different pieces of content. 1252 * 1253 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1254 * child views. <code>false</code> to only allow one child view to be the target of 1255 * any MotionEvent received by this ViewGroup. 1256 */ 1257 public void setMotionEventSplittingEnabled(boolean split) { 1258 // TODO Applications really shouldn't change this setting mid-touch event, 1259 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1260 // with gestures in progress when this is changed. 1261 if (split) { 1262 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1263 } else { 1264 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1265 mSplitMotionTargets = null; 1266 } 1267 } 1268 1269 /** 1270 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1271 */ 1272 public boolean isMotionEventSplittingEnabled() { 1273 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1274 } 1275 1276 /** 1277 * {@inheritDoc} 1278 */ 1279 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1280 1281 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1282 // We're already in this state, assume our ancestors are too 1283 return; 1284 } 1285 1286 if (disallowIntercept) { 1287 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1288 } else { 1289 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1290 } 1291 1292 // Pass it up to our parent 1293 if (mParent != null) { 1294 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1295 } 1296 } 1297 1298 /** 1299 * Implement this method to intercept all touch screen motion events. This 1300 * allows you to watch events as they are dispatched to your children, and 1301 * take ownership of the current gesture at any point. 1302 * 1303 * <p>Using this function takes some care, as it has a fairly complicated 1304 * interaction with {@link View#onTouchEvent(MotionEvent) 1305 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1306 * that method as well as this one in the correct way. Events will be 1307 * received in the following order: 1308 * 1309 * <ol> 1310 * <li> You will receive the down event here. 1311 * <li> The down event will be handled either by a child of this view 1312 * group, or given to your own onTouchEvent() method to handle; this means 1313 * you should implement onTouchEvent() to return true, so you will 1314 * continue to see the rest of the gesture (instead of looking for 1315 * a parent view to handle it). Also, by returning true from 1316 * onTouchEvent(), you will not receive any following 1317 * events in onInterceptTouchEvent() and all touch processing must 1318 * happen in onTouchEvent() like normal. 1319 * <li> For as long as you return false from this function, each following 1320 * event (up to and including the final up) will be delivered first here 1321 * and then to the target's onTouchEvent(). 1322 * <li> If you return true from here, you will not receive any 1323 * following events: the target view will receive the same event but 1324 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1325 * events will be delivered to your onTouchEvent() method and no longer 1326 * appear here. 1327 * </ol> 1328 * 1329 * @param ev The motion event being dispatched down the hierarchy. 1330 * @return Return true to steal motion events from the children and have 1331 * them dispatched to this ViewGroup through onTouchEvent(). 1332 * The current target will receive an ACTION_CANCEL event, and no further 1333 * messages will be delivered here. 1334 */ 1335 public boolean onInterceptTouchEvent(MotionEvent ev) { 1336 return false; 1337 } 1338 1339 /** 1340 * {@inheritDoc} 1341 * 1342 * Looks for a view to give focus to respecting the setting specified by 1343 * {@link #getDescendantFocusability()}. 1344 * 1345 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1346 * find focus within the children of this group when appropriate. 1347 * 1348 * @see #FOCUS_BEFORE_DESCENDANTS 1349 * @see #FOCUS_AFTER_DESCENDANTS 1350 * @see #FOCUS_BLOCK_DESCENDANTS 1351 * @see #onRequestFocusInDescendants 1352 */ 1353 @Override 1354 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1355 if (DBG) { 1356 System.out.println(this + " ViewGroup.requestFocus direction=" 1357 + direction); 1358 } 1359 int descendantFocusability = getDescendantFocusability(); 1360 1361 switch (descendantFocusability) { 1362 case FOCUS_BLOCK_DESCENDANTS: 1363 return super.requestFocus(direction, previouslyFocusedRect); 1364 case FOCUS_BEFORE_DESCENDANTS: { 1365 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1366 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1367 } 1368 case FOCUS_AFTER_DESCENDANTS: { 1369 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1370 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1371 } 1372 default: 1373 throw new IllegalStateException("descendant focusability must be " 1374 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1375 + "but is " + descendantFocusability); 1376 } 1377 } 1378 1379 /** 1380 * Look for a descendant to call {@link View#requestFocus} on. 1381 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1382 * when it wants to request focus within its children. Override this to 1383 * customize how your {@link ViewGroup} requests focus within its children. 1384 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1385 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1386 * to give a finer grained hint about where focus is coming from. May be null 1387 * if there is no hint. 1388 * @return Whether focus was taken. 1389 */ 1390 @SuppressWarnings({"ConstantConditions"}) 1391 protected boolean onRequestFocusInDescendants(int direction, 1392 Rect previouslyFocusedRect) { 1393 int index; 1394 int increment; 1395 int end; 1396 int count = mChildrenCount; 1397 if ((direction & FOCUS_FORWARD) != 0) { 1398 index = 0; 1399 increment = 1; 1400 end = count; 1401 } else { 1402 index = count - 1; 1403 increment = -1; 1404 end = -1; 1405 } 1406 final View[] children = mChildren; 1407 for (int i = index; i != end; i += increment) { 1408 View child = children[i]; 1409 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1410 if (child.requestFocus(direction, previouslyFocusedRect)) { 1411 return true; 1412 } 1413 } 1414 } 1415 return false; 1416 } 1417 1418 /** 1419 * {@inheritDoc} 1420 * 1421 * @hide 1422 */ 1423 @Override 1424 public void dispatchStartTemporaryDetach() { 1425 super.dispatchStartTemporaryDetach(); 1426 final int count = mChildrenCount; 1427 final View[] children = mChildren; 1428 for (int i = 0; i < count; i++) { 1429 children[i].dispatchStartTemporaryDetach(); 1430 } 1431 } 1432 1433 /** 1434 * {@inheritDoc} 1435 * 1436 * @hide 1437 */ 1438 @Override 1439 public void dispatchFinishTemporaryDetach() { 1440 super.dispatchFinishTemporaryDetach(); 1441 final int count = mChildrenCount; 1442 final View[] children = mChildren; 1443 for (int i = 0; i < count; i++) { 1444 children[i].dispatchFinishTemporaryDetach(); 1445 } 1446 } 1447 1448 /** 1449 * {@inheritDoc} 1450 */ 1451 @Override 1452 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1453 super.dispatchAttachedToWindow(info, visibility); 1454 visibility |= mViewFlags & VISIBILITY_MASK; 1455 final int count = mChildrenCount; 1456 final View[] children = mChildren; 1457 for (int i = 0; i < count; i++) { 1458 children[i].dispatchAttachedToWindow(info, visibility); 1459 } 1460 } 1461 1462 @Override 1463 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1464 boolean populated = false; 1465 for (int i = 0, count = getChildCount(); i < count; i++) { 1466 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1467 } 1468 return populated; 1469 } 1470 1471 /** 1472 * {@inheritDoc} 1473 */ 1474 @Override 1475 void dispatchDetachedFromWindow() { 1476 // If we still have a motion target, we are still in the process of 1477 // dispatching motion events to a child; we need to get rid of that 1478 // child to avoid dispatching events to it after the window is torn 1479 // down. To make sure we keep the child in a consistent state, we 1480 // first send it an ACTION_CANCEL motion event. 1481 if (mMotionTarget != null) { 1482 final long now = SystemClock.uptimeMillis(); 1483 final MotionEvent event = MotionEvent.obtain(now, now, 1484 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1485 mMotionTarget.dispatchTouchEvent(event); 1486 event.recycle(); 1487 mMotionTarget = null; 1488 } 1489 1490 final int count = mChildrenCount; 1491 final View[] children = mChildren; 1492 for (int i = 0; i < count; i++) { 1493 children[i].dispatchDetachedFromWindow(); 1494 } 1495 super.dispatchDetachedFromWindow(); 1496 } 1497 1498 /** 1499 * {@inheritDoc} 1500 */ 1501 @Override 1502 public void setPadding(int left, int top, int right, int bottom) { 1503 super.setPadding(left, top, right, bottom); 1504 1505 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1506 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1507 } else { 1508 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1509 } 1510 } 1511 1512 /** 1513 * {@inheritDoc} 1514 */ 1515 @Override 1516 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1517 super.dispatchSaveInstanceState(container); 1518 final int count = mChildrenCount; 1519 final View[] children = mChildren; 1520 for (int i = 0; i < count; i++) { 1521 View c = children[i]; 1522 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1523 c.dispatchSaveInstanceState(container); 1524 } 1525 } 1526 } 1527 1528 /** 1529 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1530 * not to its children. For use when overriding 1531 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1532 * their own state but not the state of their children. 1533 * 1534 * @param container the container 1535 */ 1536 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1537 super.dispatchSaveInstanceState(container); 1538 } 1539 1540 /** 1541 * {@inheritDoc} 1542 */ 1543 @Override 1544 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1545 super.dispatchRestoreInstanceState(container); 1546 final int count = mChildrenCount; 1547 final View[] children = mChildren; 1548 for (int i = 0; i < count; i++) { 1549 View c = children[i]; 1550 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1551 c.dispatchRestoreInstanceState(container); 1552 } 1553 } 1554 } 1555 1556 /** 1557 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1558 * not to its children. For use when overriding 1559 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1560 * their own state but not the state of their children. 1561 * 1562 * @param container the container 1563 */ 1564 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1565 super.dispatchRestoreInstanceState(container); 1566 } 1567 1568 /** 1569 * Enables or disables the drawing cache for each child of this view group. 1570 * 1571 * @param enabled true to enable the cache, false to dispose of it 1572 */ 1573 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1574 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1575 final View[] children = mChildren; 1576 final int count = mChildrenCount; 1577 for (int i = 0; i < count; i++) { 1578 children[i].setDrawingCacheEnabled(enabled); 1579 } 1580 } 1581 } 1582 1583 @Override 1584 protected void onAnimationStart() { 1585 super.onAnimationStart(); 1586 1587 // When this ViewGroup's animation starts, build the cache for the children 1588 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1589 final int count = mChildrenCount; 1590 final View[] children = mChildren; 1591 1592 for (int i = 0; i < count; i++) { 1593 final View child = children[i]; 1594 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1595 child.setDrawingCacheEnabled(true); 1596 child.buildDrawingCache(true); 1597 } 1598 } 1599 1600 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1601 } 1602 } 1603 1604 @Override 1605 protected void onAnimationEnd() { 1606 super.onAnimationEnd(); 1607 1608 // When this ViewGroup's animation ends, destroy the cache of the children 1609 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1610 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1611 1612 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1613 setChildrenDrawingCacheEnabled(false); 1614 } 1615 } 1616 } 1617 1618 @Override 1619 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1620 int count = mChildrenCount; 1621 int[] visibilities = null; 1622 1623 if (skipChildren) { 1624 visibilities = new int[count]; 1625 for (int i = 0; i < count; i++) { 1626 View child = getChildAt(i); 1627 visibilities[i] = child.getVisibility(); 1628 if (visibilities[i] == View.VISIBLE) { 1629 child.setVisibility(INVISIBLE); 1630 } 1631 } 1632 } 1633 1634 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1635 1636 if (skipChildren) { 1637 for (int i = 0; i < count; i++) { 1638 getChildAt(i).setVisibility(visibilities[i]); 1639 } 1640 } 1641 1642 return b; 1643 } 1644 1645 /** 1646 * {@inheritDoc} 1647 */ 1648 @Override 1649 protected void dispatchDraw(Canvas canvas) { 1650 final int count = mChildrenCount; 1651 final View[] children = mChildren; 1652 int flags = mGroupFlags; 1653 1654 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1655 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1656 1657 for (int i = 0; i < count; i++) { 1658 final View child = children[i]; 1659 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1660 final LayoutParams params = child.getLayoutParams(); 1661 attachLayoutAnimationParameters(child, params, i, count); 1662 bindLayoutAnimation(child); 1663 if (cache) { 1664 child.setDrawingCacheEnabled(true); 1665 child.buildDrawingCache(true); 1666 } 1667 } 1668 } 1669 1670 final LayoutAnimationController controller = mLayoutAnimationController; 1671 if (controller.willOverlap()) { 1672 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1673 } 1674 1675 controller.start(); 1676 1677 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1678 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1679 1680 if (cache) { 1681 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1682 } 1683 1684 if (mAnimationListener != null) { 1685 mAnimationListener.onAnimationStart(controller.getAnimation()); 1686 } 1687 } 1688 1689 int saveCount = 0; 1690 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1691 if (clipToPadding) { 1692 saveCount = canvas.save(); 1693 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1694 mScrollX + mRight - mLeft - mPaddingRight, 1695 mScrollY + mBottom - mTop - mPaddingBottom); 1696 1697 } 1698 1699 // We will draw our child's animation, let's reset the flag 1700 mPrivateFlags &= ~DRAW_ANIMATION; 1701 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1702 1703 boolean more = false; 1704 final long drawingTime = getDrawingTime(); 1705 1706 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1707 for (int i = 0; i < count; i++) { 1708 final View child = children[i]; 1709 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1710 more |= drawChild(canvas, child, drawingTime); 1711 } 1712 } 1713 } else { 1714 for (int i = 0; i < count; i++) { 1715 final View child = children[getChildDrawingOrder(count, i)]; 1716 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1717 more |= drawChild(canvas, child, drawingTime); 1718 } 1719 } 1720 } 1721 1722 // Draw any disappearing views that have animations 1723 if (mDisappearingChildren != null) { 1724 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1725 final int disappearingCount = disappearingChildren.size() - 1; 1726 // Go backwards -- we may delete as animations finish 1727 for (int i = disappearingCount; i >= 0; i--) { 1728 final View child = disappearingChildren.get(i); 1729 more |= drawChild(canvas, child, drawingTime); 1730 } 1731 } 1732 1733 if (clipToPadding) { 1734 canvas.restoreToCount(saveCount); 1735 } 1736 1737 // mGroupFlags might have been updated by drawChild() 1738 flags = mGroupFlags; 1739 1740 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1741 invalidate(); 1742 } 1743 1744 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1745 mLayoutAnimationController.isDone() && !more) { 1746 // We want to erase the drawing cache and notify the listener after the 1747 // next frame is drawn because one extra invalidate() is caused by 1748 // drawChild() after the animation is over 1749 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1750 final Runnable end = new Runnable() { 1751 public void run() { 1752 notifyAnimationListener(); 1753 } 1754 }; 1755 post(end); 1756 } 1757 } 1758 1759 /** 1760 * Returns the index of the child to draw for this iteration. Override this 1761 * if you want to change the drawing order of children. By default, it 1762 * returns i. 1763 * <p> 1764 * NOTE: In order for this method to be called, you must enable child ordering 1765 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1766 * 1767 * @param i The current iteration. 1768 * @return The index of the child to draw this iteration. 1769 * 1770 * @see #setChildrenDrawingOrderEnabled(boolean) 1771 * @see #isChildrenDrawingOrderEnabled() 1772 */ 1773 protected int getChildDrawingOrder(int childCount, int i) { 1774 return i; 1775 } 1776 1777 private void notifyAnimationListener() { 1778 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1779 mGroupFlags |= FLAG_ANIMATION_DONE; 1780 1781 if (mAnimationListener != null) { 1782 final Runnable end = new Runnable() { 1783 public void run() { 1784 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1785 } 1786 }; 1787 post(end); 1788 } 1789 1790 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1791 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1792 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1793 setChildrenDrawingCacheEnabled(false); 1794 } 1795 } 1796 1797 invalidate(); 1798 } 1799 1800 /** 1801 * Draw one child of this View Group. This method is responsible for getting 1802 * the canvas in the right state. This includes clipping, translating so 1803 * that the child's scrolled origin is at 0, 0, and applying any animation 1804 * transformations. 1805 * 1806 * @param canvas The canvas on which to draw the child 1807 * @param child Who to draw 1808 * @param drawingTime The time at which draw is occuring 1809 * @return True if an invalidate() was issued 1810 */ 1811 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1812 boolean more = false; 1813 1814 final int cl = child.mLeft; 1815 final int ct = child.mTop; 1816 final int cr = child.mRight; 1817 final int cb = child.mBottom; 1818 1819 final int flags = mGroupFlags; 1820 1821 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1822 mChildTransformation.clear(); 1823 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1824 } 1825 1826 Transformation transformToApply = null; 1827 Transformation invalidationTransform; 1828 final Animation a = child.getAnimation(); 1829 boolean concatMatrix = false; 1830 1831 boolean scalingRequired = false; 1832 boolean caching = false; 1833 if ((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 DisplayList displayList = null; 1917 Bitmap cache = null; 1918 if (caching) { 1919 if (!canvas.isHardwareAccelerated()) { 1920 cache = child.getDrawingCache(true); 1921 } else { 1922 displayList = child.getDisplayList(); 1923 } 1924 } 1925 1926 final boolean hasDisplayList = displayList != null && displayList.isReady(); 1927 final boolean hasNoCache = cache == null || hasDisplayList; 1928 1929 final int restoreTo = canvas.save(); 1930 if (hasNoCache) { 1931 canvas.translate(cl - sx, ct - sy); 1932 } else { 1933 canvas.translate(cl, ct); 1934 if (scalingRequired) { 1935 // mAttachInfo cannot be null, otherwise scalingRequired == false 1936 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1937 canvas.scale(scale, scale); 1938 } 1939 } 1940 1941 float alpha = child.getAlpha(); 1942 1943 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1944 int transX = 0; 1945 int transY = 0; 1946 1947 if (hasNoCache) { 1948 transX = -sx; 1949 transY = -sy; 1950 } 1951 1952 if (transformToApply != null) { 1953 if (concatMatrix) { 1954 // Undo the scroll translation, apply the transformation matrix, 1955 // then redo the scroll translate to get the correct result. 1956 canvas.translate(-transX, -transY); 1957 canvas.concat(transformToApply.getMatrix()); 1958 canvas.translate(transX, transY); 1959 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1960 } 1961 1962 float transformAlpha = transformToApply.getAlpha(); 1963 if (transformAlpha < 1.0f) { 1964 alpha *= transformToApply.getAlpha(); 1965 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1966 } 1967 } 1968 1969 if (!child.hasIdentityMatrix()) { 1970 canvas.translate(-transX, -transY); 1971 canvas.concat(child.getMatrix()); 1972 canvas.translate(transX, transY); 1973 } 1974 1975 if (alpha < 1.0f) { 1976 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1977 1978 if (hasNoCache) { 1979 final int multipliedAlpha = (int) (255 * alpha); 1980 if (!child.onSetAlpha(multipliedAlpha)) { 1981 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 1982 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1983 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 1984 } 1985 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1986 layerFlags); 1987 } else { 1988 child.mPrivateFlags |= ALPHA_SET; 1989 } 1990 } 1991 } 1992 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1993 child.onSetAlpha(255); 1994 child.mPrivateFlags &= ~ALPHA_SET; 1995 } 1996 1997 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1998 if (hasNoCache) { 1999 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 2000 } else { 2001 if (!scalingRequired) { 2002 canvas.clipRect(0, 0, cr - cl, cb - ct); 2003 } else { 2004 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 2005 } 2006 } 2007 } 2008 2009 if (hasNoCache) { 2010 if (!hasDisplayList) { 2011 // Fast path for layouts with no backgrounds 2012 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2013 if (ViewDebug.TRACE_HIERARCHY) { 2014 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2015 } 2016 child.mPrivateFlags &= ~DIRTY_MASK; 2017 child.dispatchDraw(canvas); 2018 } else { 2019 child.draw(canvas); 2020 } 2021 } else { 2022 ((HardwareCanvas) canvas).drawDisplayList(displayList); 2023 } 2024 } else if (cache != null) { 2025 final Paint cachePaint = mCachePaint; 2026 if (alpha < 1.0f) { 2027 cachePaint.setAlpha((int) (alpha * 255)); 2028 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2029 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2030 cachePaint.setAlpha(255); 2031 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2032 } 2033 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2034 } 2035 2036 canvas.restoreToCount(restoreTo); 2037 2038 if (a != null && !more) { 2039 child.onSetAlpha(255); 2040 finishAnimatingView(child, a); 2041 } 2042 2043 return more; 2044 } 2045 2046 /** 2047 * By default, children are clipped to their bounds before drawing. This 2048 * allows view groups to override this behavior for animations, etc. 2049 * 2050 * @param clipChildren true to clip children to their bounds, 2051 * false otherwise 2052 * @attr ref android.R.styleable#ViewGroup_clipChildren 2053 */ 2054 public void setClipChildren(boolean clipChildren) { 2055 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2056 } 2057 2058 /** 2059 * By default, children are clipped to the padding of the ViewGroup. This 2060 * allows view groups to override this behavior 2061 * 2062 * @param clipToPadding true to clip children to the padding of the 2063 * group, false otherwise 2064 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2065 */ 2066 public void setClipToPadding(boolean clipToPadding) { 2067 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2068 } 2069 2070 /** 2071 * {@inheritDoc} 2072 */ 2073 @Override 2074 public void dispatchSetSelected(boolean selected) { 2075 final View[] children = mChildren; 2076 final int count = mChildrenCount; 2077 for (int i = 0; i < count; i++) { 2078 2079 children[i].setSelected(selected); 2080 } 2081 } 2082 2083 /** 2084 * {@inheritDoc} 2085 */ 2086 @Override 2087 public void dispatchSetActivated(boolean activated) { 2088 final View[] children = mChildren; 2089 final int count = mChildrenCount; 2090 for (int i = 0; i < count; i++) { 2091 2092 children[i].setActivated(activated); 2093 } 2094 } 2095 2096 @Override 2097 protected void dispatchSetPressed(boolean pressed) { 2098 final View[] children = mChildren; 2099 final int count = mChildrenCount; 2100 for (int i = 0; i < count; i++) { 2101 children[i].setPressed(pressed); 2102 } 2103 } 2104 2105 /** 2106 * When this property is set to true, this ViewGroup supports static transformations on 2107 * children; this causes 2108 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2109 * invoked when a child is drawn. 2110 * 2111 * Any subclass overriding 2112 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2113 * set this property to true. 2114 * 2115 * @param enabled True to enable static transformations on children, false otherwise. 2116 * 2117 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2118 */ 2119 protected void setStaticTransformationsEnabled(boolean enabled) { 2120 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2121 } 2122 2123 /** 2124 * {@inheritDoc} 2125 * 2126 * @see #setStaticTransformationsEnabled(boolean) 2127 */ 2128 protected boolean getChildStaticTransformation(View child, Transformation t) { 2129 return false; 2130 } 2131 2132 /** 2133 * {@hide} 2134 */ 2135 @Override 2136 protected View findViewTraversal(int id) { 2137 if (id == mID) { 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.findViewById(id); 2149 2150 if (v != null) { 2151 return v; 2152 } 2153 } 2154 } 2155 2156 return null; 2157 } 2158 2159 /** 2160 * {@hide} 2161 */ 2162 @Override 2163 protected View findViewWithTagTraversal(Object tag) { 2164 if (tag != null && tag.equals(mTag)) { 2165 return this; 2166 } 2167 2168 final View[] where = mChildren; 2169 final int len = mChildrenCount; 2170 2171 for (int i = 0; i < len; i++) { 2172 View v = where[i]; 2173 2174 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2175 v = v.findViewWithTag(tag); 2176 2177 if (v != null) { 2178 return v; 2179 } 2180 } 2181 } 2182 2183 return null; 2184 } 2185 2186 /** 2187 * Adds a child view. If no layout parameters are already set on the child, the 2188 * default parameters for this ViewGroup are set on the child. 2189 * 2190 * @param child the child view to add 2191 * 2192 * @see #generateDefaultLayoutParams() 2193 */ 2194 public void addView(View child) { 2195 addView(child, -1); 2196 } 2197 2198 /** 2199 * Adds a child view. If no layout parameters are already set on the child, the 2200 * default parameters for this ViewGroup are set on the child. 2201 * 2202 * @param child the child view to add 2203 * @param index the position at which to add the child 2204 * 2205 * @see #generateDefaultLayoutParams() 2206 */ 2207 public void addView(View child, int index) { 2208 LayoutParams params = child.getLayoutParams(); 2209 if (params == null) { 2210 params = generateDefaultLayoutParams(); 2211 if (params == null) { 2212 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2213 } 2214 } 2215 addView(child, index, params); 2216 } 2217 2218 /** 2219 * Adds a child view with this ViewGroup's default layout parameters and the 2220 * specified width and height. 2221 * 2222 * @param child the child view to add 2223 */ 2224 public void addView(View child, int width, int height) { 2225 final LayoutParams params = generateDefaultLayoutParams(); 2226 params.width = width; 2227 params.height = height; 2228 addView(child, -1, params); 2229 } 2230 2231 /** 2232 * Adds a child view with the specified layout parameters. 2233 * 2234 * @param child the child view to add 2235 * @param params the layout parameters to set on the child 2236 */ 2237 public void addView(View child, LayoutParams params) { 2238 addView(child, -1, params); 2239 } 2240 2241 /** 2242 * Adds a child view with the specified layout parameters. 2243 * 2244 * @param child the child view to add 2245 * @param index the position at which to add the child 2246 * @param params the layout parameters to set on the child 2247 */ 2248 public void addView(View child, int index, LayoutParams params) { 2249 if (DBG) { 2250 System.out.println(this + " addView"); 2251 } 2252 2253 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2254 // therefore, we call requestLayout() on ourselves before, so that the child's request 2255 // will be blocked at our level 2256 requestLayout(); 2257 invalidate(); 2258 addViewInner(child, index, params, false); 2259 } 2260 2261 /** 2262 * {@inheritDoc} 2263 */ 2264 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2265 if (!checkLayoutParams(params)) { 2266 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2267 } 2268 if (view.mParent != this) { 2269 throw new IllegalArgumentException("Given view not a child of " + this); 2270 } 2271 view.setLayoutParams(params); 2272 } 2273 2274 /** 2275 * {@inheritDoc} 2276 */ 2277 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2278 return p != null; 2279 } 2280 2281 /** 2282 * Interface definition for a callback to be invoked when the hierarchy 2283 * within this view changed. The hierarchy changes whenever a child is added 2284 * to or removed from this view. 2285 */ 2286 public interface OnHierarchyChangeListener { 2287 /** 2288 * Called when a new child is added to a parent view. 2289 * 2290 * @param parent the view in which a child was added 2291 * @param child the new child view added in the hierarchy 2292 */ 2293 void onChildViewAdded(View parent, View child); 2294 2295 /** 2296 * Called when a child is removed from a parent view. 2297 * 2298 * @param parent the view from which the child was removed 2299 * @param child the child removed from the hierarchy 2300 */ 2301 void onChildViewRemoved(View parent, View child); 2302 } 2303 2304 /** 2305 * Register a callback to be invoked when a child is added to or removed 2306 * from this view. 2307 * 2308 * @param listener the callback to invoke on hierarchy change 2309 */ 2310 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2311 mOnHierarchyChangeListener = listener; 2312 } 2313 2314 /** 2315 * Adds a view during layout. This is useful if in your onLayout() method, 2316 * you need to add more views (as does the list view for example). 2317 * 2318 * If index is negative, it means put it at the end of the list. 2319 * 2320 * @param child the view to add to the group 2321 * @param index the index at which the child must be added 2322 * @param params the layout parameters to associate with the child 2323 * @return true if the child was added, false otherwise 2324 */ 2325 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2326 return addViewInLayout(child, index, params, false); 2327 } 2328 2329 /** 2330 * Adds a view during layout. This is useful if in your onLayout() method, 2331 * you need to add more views (as does the list view for example). 2332 * 2333 * If index is negative, it means put it at the end of the list. 2334 * 2335 * @param child the view to add to the group 2336 * @param index the index at which the child must be added 2337 * @param params the layout parameters to associate with the child 2338 * @param preventRequestLayout if true, calling this method will not trigger a 2339 * layout request on child 2340 * @return true if the child was added, false otherwise 2341 */ 2342 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2343 boolean preventRequestLayout) { 2344 child.mParent = null; 2345 addViewInner(child, index, params, preventRequestLayout); 2346 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2347 return true; 2348 } 2349 2350 /** 2351 * Prevents the specified child to be laid out during the next layout pass. 2352 * 2353 * @param child the child on which to perform the cleanup 2354 */ 2355 protected void cleanupLayoutState(View child) { 2356 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2357 } 2358 2359 private void addViewInner(View child, int index, LayoutParams params, 2360 boolean preventRequestLayout) { 2361 2362 if (child.getParent() != null) { 2363 throw new IllegalStateException("The specified child already has a parent. " + 2364 "You must call removeView() on the child's parent first."); 2365 } 2366 2367 if (mTransition != null) { 2368 mTransition.childAdd(this, child); 2369 } 2370 2371 if (!checkLayoutParams(params)) { 2372 params = generateLayoutParams(params); 2373 } 2374 2375 if (preventRequestLayout) { 2376 child.mLayoutParams = params; 2377 } else { 2378 child.setLayoutParams(params); 2379 } 2380 2381 if (index < 0) { 2382 index = mChildrenCount; 2383 } 2384 2385 addInArray(child, index); 2386 2387 // tell our children 2388 if (preventRequestLayout) { 2389 child.assignParent(this); 2390 } else { 2391 child.mParent = this; 2392 } 2393 2394 if (child.hasFocus()) { 2395 requestChildFocus(child, child.findFocus()); 2396 } 2397 2398 AttachInfo ai = mAttachInfo; 2399 if (ai != null) { 2400 boolean lastKeepOn = ai.mKeepScreenOn; 2401 ai.mKeepScreenOn = false; 2402 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2403 if (ai.mKeepScreenOn) { 2404 needGlobalAttributesUpdate(true); 2405 } 2406 ai.mKeepScreenOn = lastKeepOn; 2407 } 2408 2409 if (mOnHierarchyChangeListener != null) { 2410 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2411 } 2412 2413 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2414 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2415 } 2416 } 2417 2418 private void addInArray(View child, int index) { 2419 View[] children = mChildren; 2420 final int count = mChildrenCount; 2421 final int size = children.length; 2422 if (index == count) { 2423 if (size == count) { 2424 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2425 System.arraycopy(children, 0, mChildren, 0, size); 2426 children = mChildren; 2427 } 2428 children[mChildrenCount++] = child; 2429 } else if (index < count) { 2430 if (size == count) { 2431 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2432 System.arraycopy(children, 0, mChildren, 0, index); 2433 System.arraycopy(children, index, mChildren, index + 1, count - index); 2434 children = mChildren; 2435 } else { 2436 System.arraycopy(children, index, children, index + 1, count - index); 2437 } 2438 children[index] = child; 2439 mChildrenCount++; 2440 } else { 2441 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2442 } 2443 } 2444 2445 // This method also sets the child's mParent to null 2446 private void removeFromArray(int index) { 2447 final View[] children = mChildren; 2448 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2449 children[index].mParent = null; 2450 } 2451 final int count = mChildrenCount; 2452 if (index == count - 1) { 2453 children[--mChildrenCount] = null; 2454 } else if (index >= 0 && index < count) { 2455 System.arraycopy(children, index + 1, children, index, count - index - 1); 2456 children[--mChildrenCount] = null; 2457 } else { 2458 throw new IndexOutOfBoundsException(); 2459 } 2460 } 2461 2462 // This method also sets the children's mParent to null 2463 private void removeFromArray(int start, int count) { 2464 final View[] children = mChildren; 2465 final int childrenCount = mChildrenCount; 2466 2467 start = Math.max(0, start); 2468 final int end = Math.min(childrenCount, start + count); 2469 2470 if (start == end) { 2471 return; 2472 } 2473 2474 if (end == childrenCount) { 2475 for (int i = start; i < end; i++) { 2476 children[i].mParent = null; 2477 children[i] = null; 2478 } 2479 } else { 2480 for (int i = start; i < end; i++) { 2481 children[i].mParent = null; 2482 } 2483 2484 // Since we're looping above, we might as well do the copy, but is arraycopy() 2485 // faster than the extra 2 bounds checks we would do in the loop? 2486 System.arraycopy(children, end, children, start, childrenCount - end); 2487 2488 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2489 children[i] = null; 2490 } 2491 } 2492 2493 mChildrenCount -= (end - start); 2494 } 2495 2496 private void bindLayoutAnimation(View child) { 2497 Animation a = mLayoutAnimationController.getAnimationForView(child); 2498 child.setAnimation(a); 2499 } 2500 2501 /** 2502 * Subclasses should override this method to set layout animation 2503 * parameters on the supplied child. 2504 * 2505 * @param child the child to associate with animation parameters 2506 * @param params the child's layout parameters which hold the animation 2507 * parameters 2508 * @param index the index of the child in the view group 2509 * @param count the number of children in the view group 2510 */ 2511 protected void attachLayoutAnimationParameters(View child, 2512 LayoutParams params, int index, int count) { 2513 LayoutAnimationController.AnimationParameters animationParams = 2514 params.layoutAnimationParameters; 2515 if (animationParams == null) { 2516 animationParams = new LayoutAnimationController.AnimationParameters(); 2517 params.layoutAnimationParameters = animationParams; 2518 } 2519 2520 animationParams.count = count; 2521 animationParams.index = index; 2522 } 2523 2524 /** 2525 * {@inheritDoc} 2526 */ 2527 public void removeView(View view) { 2528 removeViewInternal(view); 2529 requestLayout(); 2530 invalidate(); 2531 } 2532 2533 /** 2534 * Removes a view during layout. This is useful if in your onLayout() method, 2535 * you need to remove more views. 2536 * 2537 * @param view the view to remove from the group 2538 */ 2539 public void removeViewInLayout(View view) { 2540 removeViewInternal(view); 2541 } 2542 2543 /** 2544 * Removes a range of views during layout. This is useful if in your onLayout() method, 2545 * you need to remove more views. 2546 * 2547 * @param start the index of the first view to remove from the group 2548 * @param count the number of views to remove from the group 2549 */ 2550 public void removeViewsInLayout(int start, int count) { 2551 removeViewsInternal(start, count); 2552 } 2553 2554 /** 2555 * Removes the view at the specified position in the group. 2556 * 2557 * @param index the position in the group of the view to remove 2558 */ 2559 public void removeViewAt(int index) { 2560 removeViewInternal(index, getChildAt(index)); 2561 requestLayout(); 2562 invalidate(); 2563 } 2564 2565 /** 2566 * Removes the specified range of views from the group. 2567 * 2568 * @param start the first position in the group of the range of views to remove 2569 * @param count the number of views to remove 2570 */ 2571 public void removeViews(int start, int count) { 2572 removeViewsInternal(start, count); 2573 requestLayout(); 2574 invalidate(); 2575 } 2576 2577 private void removeViewInternal(View view) { 2578 final int index = indexOfChild(view); 2579 if (index >= 0) { 2580 removeViewInternal(index, view); 2581 } 2582 } 2583 2584 private void removeViewInternal(int index, View view) { 2585 2586 if (mTransition != null) { 2587 mTransition.childRemove(this, view); 2588 } 2589 2590 boolean clearChildFocus = false; 2591 if (view == mFocused) { 2592 view.clearFocusForRemoval(); 2593 clearChildFocus = true; 2594 } 2595 2596 if (view.getAnimation() != null || 2597 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2598 addDisappearingView(view); 2599 } else if (view.mAttachInfo != null) { 2600 view.dispatchDetachedFromWindow(); 2601 } 2602 2603 if (mOnHierarchyChangeListener != null) { 2604 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2605 } 2606 2607 needGlobalAttributesUpdate(false); 2608 2609 removeFromArray(index); 2610 2611 if (clearChildFocus) { 2612 clearChildFocus(view); 2613 } 2614 } 2615 2616 /** 2617 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2618 * not null, changes in layout which occur because of children being added to or removed from 2619 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2620 * object. By default, the transition object is null (so layout changes are not animated). 2621 * 2622 * @param transition The LayoutTransition object that will animated changes in layout. A value 2623 * of <code>null</code> means no transition will run on layout changes. 2624 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2625 */ 2626 public void setLayoutTransition(LayoutTransition transition) { 2627 if (mTransition != null) { 2628 mTransition.removeTransitionListener(mLayoutTransitionListener); 2629 } 2630 mTransition = transition; 2631 if (mTransition != null) { 2632 mTransition.addTransitionListener(mLayoutTransitionListener); 2633 } 2634 } 2635 2636 /** 2637 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2638 * not null, changes in layout which occur because of children being added to or removed from 2639 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2640 * object. By default, the transition object is null (so layout changes are not animated). 2641 * 2642 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2643 * A value of <code>null</code> means no transition will run on layout changes. 2644 */ 2645 public LayoutTransition getLayoutTransition() { 2646 return mTransition; 2647 } 2648 2649 private void removeViewsInternal(int start, int count) { 2650 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2651 final boolean notifyListener = onHierarchyChangeListener != null; 2652 final View focused = mFocused; 2653 final boolean detach = mAttachInfo != null; 2654 View clearChildFocus = null; 2655 2656 final View[] children = mChildren; 2657 final int end = start + count; 2658 2659 for (int i = start; i < end; i++) { 2660 final View view = children[i]; 2661 2662 if (mTransition != null) { 2663 mTransition.childRemove(this, view); 2664 } 2665 2666 if (view == focused) { 2667 view.clearFocusForRemoval(); 2668 clearChildFocus = view; 2669 } 2670 2671 if (view.getAnimation() != null || 2672 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2673 addDisappearingView(view); 2674 } else if (detach) { 2675 view.dispatchDetachedFromWindow(); 2676 } 2677 2678 needGlobalAttributesUpdate(false); 2679 2680 if (notifyListener) { 2681 onHierarchyChangeListener.onChildViewRemoved(this, view); 2682 } 2683 } 2684 2685 removeFromArray(start, count); 2686 2687 if (clearChildFocus != null) { 2688 clearChildFocus(clearChildFocus); 2689 } 2690 } 2691 2692 /** 2693 * Call this method to remove all child views from the 2694 * ViewGroup. 2695 */ 2696 public void removeAllViews() { 2697 removeAllViewsInLayout(); 2698 requestLayout(); 2699 invalidate(); 2700 } 2701 2702 /** 2703 * Called by a ViewGroup subclass to remove child views from itself, 2704 * when it must first know its size on screen before it can calculate how many 2705 * child views it will render. An example is a Gallery or a ListView, which 2706 * may "have" 50 children, but actually only render the number of children 2707 * that can currently fit inside the object on screen. Do not call 2708 * this method unless you are extending ViewGroup and understand the 2709 * view measuring and layout pipeline. 2710 */ 2711 public void removeAllViewsInLayout() { 2712 final int count = mChildrenCount; 2713 if (count <= 0) { 2714 return; 2715 } 2716 2717 final View[] children = mChildren; 2718 mChildrenCount = 0; 2719 2720 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2721 final boolean notify = listener != null; 2722 final View focused = mFocused; 2723 final boolean detach = mAttachInfo != null; 2724 View clearChildFocus = null; 2725 2726 needGlobalAttributesUpdate(false); 2727 2728 for (int i = count - 1; i >= 0; i--) { 2729 final View view = children[i]; 2730 2731 if (mTransition != null) { 2732 mTransition.childRemove(this, view); 2733 } 2734 2735 if (view == focused) { 2736 view.clearFocusForRemoval(); 2737 clearChildFocus = view; 2738 } 2739 2740 if (view.getAnimation() != null || 2741 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2742 addDisappearingView(view); 2743 } else if (detach) { 2744 view.dispatchDetachedFromWindow(); 2745 } 2746 2747 if (notify) { 2748 listener.onChildViewRemoved(this, view); 2749 } 2750 2751 view.mParent = null; 2752 children[i] = null; 2753 } 2754 2755 if (clearChildFocus != null) { 2756 clearChildFocus(clearChildFocus); 2757 } 2758 } 2759 2760 /** 2761 * Finishes the removal of a detached view. This method will dispatch the detached from 2762 * window event and notify the hierarchy change listener. 2763 * 2764 * @param child the child to be definitely removed from the view hierarchy 2765 * @param animate if true and the view has an animation, the view is placed in the 2766 * disappearing views list, otherwise, it is detached from the window 2767 * 2768 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2769 * @see #detachAllViewsFromParent() 2770 * @see #detachViewFromParent(View) 2771 * @see #detachViewFromParent(int) 2772 */ 2773 protected void removeDetachedView(View child, boolean animate) { 2774 if (mTransition != null) { 2775 mTransition.childRemove(this, child); 2776 } 2777 2778 if (child == mFocused) { 2779 child.clearFocus(); 2780 } 2781 2782 if ((animate && child.getAnimation() != null) || 2783 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 2784 addDisappearingView(child); 2785 } else if (child.mAttachInfo != null) { 2786 child.dispatchDetachedFromWindow(); 2787 } 2788 2789 if (mOnHierarchyChangeListener != null) { 2790 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2791 } 2792 } 2793 2794 /** 2795 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2796 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2797 * by calling {@link #getChildAt(int)}. 2798 * 2799 * This method should be called only for view which were detached from their parent. 2800 * 2801 * @param child the child to attach 2802 * @param index the index at which the child should be attached 2803 * @param params the layout parameters of the child 2804 * 2805 * @see #removeDetachedView(View, boolean) 2806 * @see #detachAllViewsFromParent() 2807 * @see #detachViewFromParent(View) 2808 * @see #detachViewFromParent(int) 2809 */ 2810 protected void attachViewToParent(View child, int index, LayoutParams params) { 2811 child.mLayoutParams = params; 2812 2813 if (index < 0) { 2814 index = mChildrenCount; 2815 } 2816 2817 addInArray(child, index); 2818 2819 child.mParent = this; 2820 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2821 2822 if (child.hasFocus()) { 2823 requestChildFocus(child, child.findFocus()); 2824 } 2825 } 2826 2827 /** 2828 * Detaches a view from its parent. Detaching a view should be temporary and followed 2829 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2830 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2831 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2832 * 2833 * @param child the child to detach 2834 * 2835 * @see #detachViewFromParent(int) 2836 * @see #detachViewsFromParent(int, int) 2837 * @see #detachAllViewsFromParent() 2838 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2839 * @see #removeDetachedView(View, boolean) 2840 */ 2841 protected void detachViewFromParent(View child) { 2842 removeFromArray(indexOfChild(child)); 2843 } 2844 2845 /** 2846 * Detaches a view from its parent. Detaching a view should be temporary and followed 2847 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2848 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2849 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2850 * 2851 * @param index the index of the child to detach 2852 * 2853 * @see #detachViewFromParent(View) 2854 * @see #detachAllViewsFromParent() 2855 * @see #detachViewsFromParent(int, int) 2856 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2857 * @see #removeDetachedView(View, boolean) 2858 */ 2859 protected void detachViewFromParent(int index) { 2860 removeFromArray(index); 2861 } 2862 2863 /** 2864 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2865 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2866 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2867 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2868 * 2869 * @param start the first index of the childrend range to detach 2870 * @param count the number of children to detach 2871 * 2872 * @see #detachViewFromParent(View) 2873 * @see #detachViewFromParent(int) 2874 * @see #detachAllViewsFromParent() 2875 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2876 * @see #removeDetachedView(View, boolean) 2877 */ 2878 protected void detachViewsFromParent(int start, int count) { 2879 removeFromArray(start, count); 2880 } 2881 2882 /** 2883 * Detaches all views from the parent. Detaching a view should be temporary and followed 2884 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2885 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2886 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2887 * 2888 * @see #detachViewFromParent(View) 2889 * @see #detachViewFromParent(int) 2890 * @see #detachViewsFromParent(int, int) 2891 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2892 * @see #removeDetachedView(View, boolean) 2893 */ 2894 protected void detachAllViewsFromParent() { 2895 final int count = mChildrenCount; 2896 if (count <= 0) { 2897 return; 2898 } 2899 2900 final View[] children = mChildren; 2901 mChildrenCount = 0; 2902 2903 for (int i = count - 1; i >= 0; i--) { 2904 children[i].mParent = null; 2905 children[i] = null; 2906 } 2907 } 2908 2909 /** 2910 * Don't call or override this method. It is used for the implementation of 2911 * the view hierarchy. 2912 */ 2913 public final void invalidateChild(View child, final Rect dirty) { 2914 if (ViewDebug.TRACE_HIERARCHY) { 2915 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2916 } 2917 2918 ViewParent parent = this; 2919 2920 final AttachInfo attachInfo = mAttachInfo; 2921 if (attachInfo != null) { 2922 final int[] location = attachInfo.mInvalidateChildLocation; 2923 location[CHILD_LEFT_INDEX] = child.mLeft; 2924 location[CHILD_TOP_INDEX] = child.mTop; 2925 Matrix childMatrix = child.getMatrix(); 2926 if (!childMatrix.isIdentity()) { 2927 RectF boundingRect = attachInfo.mTmpTransformRect; 2928 boundingRect.set(dirty); 2929 childMatrix.mapRect(boundingRect); 2930 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2931 (int) (boundingRect.right + 0.5f), 2932 (int) (boundingRect.bottom + 0.5f)); 2933 } 2934 2935 // If the child is drawing an animation, we want to copy this flag onto 2936 // ourselves and the parent to make sure the invalidate request goes 2937 // through 2938 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2939 2940 // Check whether the child that requests the invalidate is fully opaque 2941 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2942 child.getAnimation() != null; 2943 // Mark the child as dirty, using the appropriate flag 2944 // Make sure we do not set both flags at the same time 2945 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2946 2947 do { 2948 View view = null; 2949 if (parent instanceof View) { 2950 view = (View) parent; 2951 } 2952 2953 if (drawAnimation) { 2954 if (view != null) { 2955 view.mPrivateFlags |= DRAW_ANIMATION; 2956 } else if (parent instanceof ViewRoot) { 2957 ((ViewRoot) parent).mIsAnimating = true; 2958 } 2959 } 2960 2961 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2962 // flag coming from the child that initiated the invalidate 2963 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2964 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2965 } 2966 2967 parent = parent.invalidateChildInParent(location, dirty); 2968 if (view != null) { 2969 // Account for transform on current parent 2970 Matrix m = view.getMatrix(); 2971 if (!m.isIdentity()) { 2972 RectF boundingRect = attachInfo.mTmpTransformRect; 2973 boundingRect.set(dirty); 2974 m.mapRect(boundingRect); 2975 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2976 (int) (boundingRect.right + 0.5f), 2977 (int) (boundingRect.bottom + 0.5f)); 2978 } 2979 } 2980 } while (parent != null); 2981 } 2982 } 2983 2984 /** 2985 * Don't call or override this method. It is used for the implementation of 2986 * the view hierarchy. 2987 * 2988 * This implementation returns null if this ViewGroup does not have a parent, 2989 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2990 * does not intersect with this ViewGroup's bounds. 2991 */ 2992 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2993 if (ViewDebug.TRACE_HIERARCHY) { 2994 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2995 } 2996 2997 if ((mPrivateFlags & DRAWN) == DRAWN) { 2998 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2999 FLAG_OPTIMIZE_INVALIDATE) { 3000 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 3001 location[CHILD_TOP_INDEX] - mScrollY); 3002 3003 final int left = mLeft; 3004 final int top = mTop; 3005 3006 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 3007 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 3008 mPrivateFlags &= ~DRAWING_CACHE_VALID; 3009 3010 location[CHILD_LEFT_INDEX] = left; 3011 location[CHILD_TOP_INDEX] = top; 3012 3013 return mParent; 3014 } 3015 } else { 3016 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 3017 3018 location[CHILD_LEFT_INDEX] = mLeft; 3019 location[CHILD_TOP_INDEX] = mTop; 3020 3021 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 3022 mBottom - location[CHILD_TOP_INDEX]); 3023 3024 return mParent; 3025 } 3026 } 3027 3028 return null; 3029 } 3030 3031 /** 3032 * Offset a rectangle that is in a descendant's coordinate 3033 * space into our coordinate space. 3034 * @param descendant A descendant of this view 3035 * @param rect A rectangle defined in descendant's coordinate space. 3036 */ 3037 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3038 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3039 } 3040 3041 /** 3042 * Offset a rectangle that is in our coordinate space into an ancestor's 3043 * coordinate space. 3044 * @param descendant A descendant of this view 3045 * @param rect A rectangle defined in descendant's coordinate space. 3046 */ 3047 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3048 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3049 } 3050 3051 /** 3052 * Helper method that offsets a rect either from parent to descendant or 3053 * descendant to parent. 3054 */ 3055 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3056 boolean offsetFromChildToParent, boolean clipToBounds) { 3057 3058 // already in the same coord system :) 3059 if (descendant == this) { 3060 return; 3061 } 3062 3063 ViewParent theParent = descendant.mParent; 3064 3065 // search and offset up to the parent 3066 while ((theParent != null) 3067 && (theParent instanceof View) 3068 && (theParent != this)) { 3069 3070 if (offsetFromChildToParent) { 3071 rect.offset(descendant.mLeft - descendant.mScrollX, 3072 descendant.mTop - descendant.mScrollY); 3073 if (clipToBounds) { 3074 View p = (View) theParent; 3075 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3076 } 3077 } else { 3078 if (clipToBounds) { 3079 View p = (View) theParent; 3080 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3081 } 3082 rect.offset(descendant.mScrollX - descendant.mLeft, 3083 descendant.mScrollY - descendant.mTop); 3084 } 3085 3086 descendant = (View) theParent; 3087 theParent = descendant.mParent; 3088 } 3089 3090 // now that we are up to this view, need to offset one more time 3091 // to get into our coordinate space 3092 if (theParent == this) { 3093 if (offsetFromChildToParent) { 3094 rect.offset(descendant.mLeft - descendant.mScrollX, 3095 descendant.mTop - descendant.mScrollY); 3096 } else { 3097 rect.offset(descendant.mScrollX - descendant.mLeft, 3098 descendant.mScrollY - descendant.mTop); 3099 } 3100 } else { 3101 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3102 } 3103 } 3104 3105 /** 3106 * Offset the vertical location of all children of this view by the specified number of pixels. 3107 * 3108 * @param offset the number of pixels to offset 3109 * 3110 * @hide 3111 */ 3112 public void offsetChildrenTopAndBottom(int offset) { 3113 final int count = mChildrenCount; 3114 final View[] children = mChildren; 3115 3116 for (int i = 0; i < count; i++) { 3117 final View v = children[i]; 3118 v.mTop += offset; 3119 v.mBottom += offset; 3120 } 3121 } 3122 3123 /** 3124 * {@inheritDoc} 3125 */ 3126 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3127 int dx = child.mLeft - mScrollX; 3128 int dy = child.mTop - mScrollY; 3129 if (offset != null) { 3130 offset.x += dx; 3131 offset.y += dy; 3132 } 3133 r.offset(dx, dy); 3134 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3135 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3136 } 3137 3138 /** 3139 * {@inheritDoc} 3140 */ 3141 @Override 3142 protected abstract void onLayout(boolean changed, 3143 int l, int t, int r, int b); 3144 3145 /** 3146 * Indicates whether the view group has the ability to animate its children 3147 * after the first layout. 3148 * 3149 * @return true if the children can be animated, false otherwise 3150 */ 3151 protected boolean canAnimate() { 3152 return mLayoutAnimationController != null; 3153 } 3154 3155 /** 3156 * Runs the layout animation. Calling this method triggers a relayout of 3157 * this view group. 3158 */ 3159 public void startLayoutAnimation() { 3160 if (mLayoutAnimationController != null) { 3161 mGroupFlags |= FLAG_RUN_ANIMATION; 3162 requestLayout(); 3163 } 3164 } 3165 3166 /** 3167 * Schedules the layout animation to be played after the next layout pass 3168 * of this view group. This can be used to restart the layout animation 3169 * when the content of the view group changes or when the activity is 3170 * paused and resumed. 3171 */ 3172 public void scheduleLayoutAnimation() { 3173 mGroupFlags |= FLAG_RUN_ANIMATION; 3174 } 3175 3176 /** 3177 * Sets the layout animation controller used to animate the group's 3178 * children after the first layout. 3179 * 3180 * @param controller the animation controller 3181 */ 3182 public void setLayoutAnimation(LayoutAnimationController controller) { 3183 mLayoutAnimationController = controller; 3184 if (mLayoutAnimationController != null) { 3185 mGroupFlags |= FLAG_RUN_ANIMATION; 3186 } 3187 } 3188 3189 /** 3190 * Returns the layout animation controller used to animate the group's 3191 * children. 3192 * 3193 * @return the current animation controller 3194 */ 3195 public LayoutAnimationController getLayoutAnimation() { 3196 return mLayoutAnimationController; 3197 } 3198 3199 /** 3200 * Indicates whether the children's drawing cache is used during a layout 3201 * animation. By default, the drawing cache is enabled but this will prevent 3202 * nested layout animations from working. To nest animations, you must disable 3203 * the cache. 3204 * 3205 * @return true if the animation cache is enabled, false otherwise 3206 * 3207 * @see #setAnimationCacheEnabled(boolean) 3208 * @see View#setDrawingCacheEnabled(boolean) 3209 */ 3210 @ViewDebug.ExportedProperty 3211 public boolean isAnimationCacheEnabled() { 3212 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3213 } 3214 3215 /** 3216 * Enables or disables the children's drawing cache during a layout animation. 3217 * By default, the drawing cache is enabled but this will prevent nested 3218 * layout animations from working. To nest animations, you must disable the 3219 * cache. 3220 * 3221 * @param enabled true to enable the animation cache, false otherwise 3222 * 3223 * @see #isAnimationCacheEnabled() 3224 * @see View#setDrawingCacheEnabled(boolean) 3225 */ 3226 public void setAnimationCacheEnabled(boolean enabled) { 3227 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3228 } 3229 3230 /** 3231 * Indicates whether this ViewGroup will always try to draw its children using their 3232 * drawing cache. By default this property is enabled. 3233 * 3234 * @return true if the animation cache is enabled, false otherwise 3235 * 3236 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3237 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3238 * @see View#setDrawingCacheEnabled(boolean) 3239 */ 3240 @ViewDebug.ExportedProperty(category = "drawing") 3241 public boolean isAlwaysDrawnWithCacheEnabled() { 3242 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3243 } 3244 3245 /** 3246 * Indicates whether this ViewGroup will always try to draw its children using their 3247 * drawing cache. This property can be set to true when the cache rendering is 3248 * slightly different from the children's normal rendering. Renderings can be different, 3249 * for instance, when the cache's quality is set to low. 3250 * 3251 * When this property is disabled, the ViewGroup will use the drawing cache of its 3252 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3253 * when to start using the drawing cache and when to stop using it. 3254 * 3255 * @param always true to always draw with the drawing cache, false otherwise 3256 * 3257 * @see #isAlwaysDrawnWithCacheEnabled() 3258 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3259 * @see View#setDrawingCacheEnabled(boolean) 3260 * @see View#setDrawingCacheQuality(int) 3261 */ 3262 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3263 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3264 } 3265 3266 /** 3267 * Indicates whether the ViewGroup is currently drawing its children using 3268 * their drawing cache. 3269 * 3270 * @return true if children should be drawn with their cache, false otherwise 3271 * 3272 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3273 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3274 */ 3275 @ViewDebug.ExportedProperty(category = "drawing") 3276 protected boolean isChildrenDrawnWithCacheEnabled() { 3277 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3278 } 3279 3280 /** 3281 * Tells the ViewGroup to draw its children using their drawing cache. This property 3282 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3283 * will be used only if it has been enabled. 3284 * 3285 * Subclasses should call this method to start and stop using the drawing cache when 3286 * they perform performance sensitive operations, like scrolling or animating. 3287 * 3288 * @param enabled true if children should be drawn with their cache, false otherwise 3289 * 3290 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3291 * @see #isChildrenDrawnWithCacheEnabled() 3292 */ 3293 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3294 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3295 } 3296 3297 /** 3298 * Indicates whether the ViewGroup is drawing its children in the order defined by 3299 * {@link #getChildDrawingOrder(int, int)}. 3300 * 3301 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3302 * false otherwise 3303 * 3304 * @see #setChildrenDrawingOrderEnabled(boolean) 3305 * @see #getChildDrawingOrder(int, int) 3306 */ 3307 @ViewDebug.ExportedProperty(category = "drawing") 3308 protected boolean isChildrenDrawingOrderEnabled() { 3309 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3310 } 3311 3312 /** 3313 * Tells the ViewGroup whether to draw its children in the order defined by the method 3314 * {@link #getChildDrawingOrder(int, int)}. 3315 * 3316 * @param enabled true if the order of the children when drawing is determined by 3317 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3318 * 3319 * @see #isChildrenDrawingOrderEnabled() 3320 * @see #getChildDrawingOrder(int, int) 3321 */ 3322 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3323 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3324 } 3325 3326 private void setBooleanFlag(int flag, boolean value) { 3327 if (value) { 3328 mGroupFlags |= flag; 3329 } else { 3330 mGroupFlags &= ~flag; 3331 } 3332 } 3333 3334 /** 3335 * Returns an integer indicating what types of drawing caches are kept in memory. 3336 * 3337 * @see #setPersistentDrawingCache(int) 3338 * @see #setAnimationCacheEnabled(boolean) 3339 * 3340 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3341 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3342 * and {@link #PERSISTENT_ALL_CACHES} 3343 */ 3344 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3345 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3346 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3347 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3348 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3349 }) 3350 public int getPersistentDrawingCache() { 3351 return mPersistentDrawingCache; 3352 } 3353 3354 /** 3355 * Indicates what types of drawing caches should be kept in memory after 3356 * they have been created. 3357 * 3358 * @see #getPersistentDrawingCache() 3359 * @see #setAnimationCacheEnabled(boolean) 3360 * 3361 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3362 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3363 * and {@link #PERSISTENT_ALL_CACHES} 3364 */ 3365 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3366 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3367 } 3368 3369 /** 3370 * Returns a new set of layout parameters based on the supplied attributes set. 3371 * 3372 * @param attrs the attributes to build the layout parameters from 3373 * 3374 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3375 * of its descendants 3376 */ 3377 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3378 return new LayoutParams(getContext(), attrs); 3379 } 3380 3381 /** 3382 * Returns a safe set of layout parameters based on the supplied layout params. 3383 * When a ViewGroup is passed a View whose layout params do not pass the test of 3384 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3385 * is invoked. This method should return a new set of layout params suitable for 3386 * this ViewGroup, possibly by copying the appropriate attributes from the 3387 * specified set of layout params. 3388 * 3389 * @param p The layout parameters to convert into a suitable set of layout parameters 3390 * for this ViewGroup. 3391 * 3392 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3393 * of its descendants 3394 */ 3395 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3396 return p; 3397 } 3398 3399 /** 3400 * Returns a set of default layout parameters. These parameters are requested 3401 * when the View passed to {@link #addView(View)} has no layout parameters 3402 * already set. If null is returned, an exception is thrown from addView. 3403 * 3404 * @return a set of default layout parameters or null 3405 */ 3406 protected LayoutParams generateDefaultLayoutParams() { 3407 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3408 } 3409 3410 /** 3411 * @hide 3412 */ 3413 @Override 3414 protected boolean dispatchConsistencyCheck(int consistency) { 3415 boolean result = super.dispatchConsistencyCheck(consistency); 3416 3417 final int count = mChildrenCount; 3418 final View[] children = mChildren; 3419 for (int i = 0; i < count; i++) { 3420 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3421 } 3422 3423 return result; 3424 } 3425 3426 /** 3427 * @hide 3428 */ 3429 @Override 3430 protected boolean onConsistencyCheck(int consistency) { 3431 boolean result = super.onConsistencyCheck(consistency); 3432 3433 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3434 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3435 3436 if (checkLayout) { 3437 final int count = mChildrenCount; 3438 final View[] children = mChildren; 3439 for (int i = 0; i < count; i++) { 3440 if (children[i].getParent() != this) { 3441 result = false; 3442 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3443 "View " + children[i] + " has no parent/a parent that is not " + this); 3444 } 3445 } 3446 } 3447 3448 if (checkDrawing) { 3449 // If this group is dirty, check that the parent is dirty as well 3450 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3451 final ViewParent parent = getParent(); 3452 if (parent != null && !(parent instanceof ViewRoot)) { 3453 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3454 result = false; 3455 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3456 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3457 } 3458 } 3459 } 3460 } 3461 3462 return result; 3463 } 3464 3465 /** 3466 * {@inheritDoc} 3467 */ 3468 @Override 3469 protected void debug(int depth) { 3470 super.debug(depth); 3471 String output; 3472 3473 if (mFocused != null) { 3474 output = debugIndent(depth); 3475 output += "mFocused"; 3476 Log.d(VIEW_LOG_TAG, output); 3477 } 3478 if (mChildrenCount != 0) { 3479 output = debugIndent(depth); 3480 output += "{"; 3481 Log.d(VIEW_LOG_TAG, output); 3482 } 3483 int count = mChildrenCount; 3484 for (int i = 0; i < count; i++) { 3485 View child = mChildren[i]; 3486 child.debug(depth + 1); 3487 } 3488 3489 if (mChildrenCount != 0) { 3490 output = debugIndent(depth); 3491 output += "}"; 3492 Log.d(VIEW_LOG_TAG, output); 3493 } 3494 } 3495 3496 /** 3497 * Returns the position in the group of the specified child view. 3498 * 3499 * @param child the view for which to get the position 3500 * @return a positive integer representing the position of the view in the 3501 * group, or -1 if the view does not exist in the group 3502 */ 3503 public int indexOfChild(View child) { 3504 final int count = mChildrenCount; 3505 final View[] children = mChildren; 3506 for (int i = 0; i < count; i++) { 3507 if (children[i] == child) { 3508 return i; 3509 } 3510 } 3511 return -1; 3512 } 3513 3514 /** 3515 * Returns the number of children in the group. 3516 * 3517 * @return a positive integer representing the number of children in 3518 * the group 3519 */ 3520 public int getChildCount() { 3521 return mChildrenCount; 3522 } 3523 3524 /** 3525 * Returns the view at the specified position in the group. 3526 * 3527 * @param index the position at which to get the view from 3528 * @return the view at the specified position or null if the position 3529 * does not exist within the group 3530 */ 3531 public View getChildAt(int index) { 3532 try { 3533 return mChildren[index]; 3534 } catch (IndexOutOfBoundsException ex) { 3535 return null; 3536 } 3537 } 3538 3539 /** 3540 * Ask all of the children of this view to measure themselves, taking into 3541 * account both the MeasureSpec requirements for this view and its padding. 3542 * We skip children that are in the GONE state The heavy lifting is done in 3543 * getChildMeasureSpec. 3544 * 3545 * @param widthMeasureSpec The width requirements for this view 3546 * @param heightMeasureSpec The height requirements for this view 3547 */ 3548 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3549 final int size = mChildrenCount; 3550 final View[] children = mChildren; 3551 for (int i = 0; i < size; ++i) { 3552 final View child = children[i]; 3553 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3554 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3555 } 3556 } 3557 } 3558 3559 /** 3560 * Ask one of the children of this view to measure itself, taking into 3561 * account both the MeasureSpec requirements for this view and its padding. 3562 * The heavy lifting is done in getChildMeasureSpec. 3563 * 3564 * @param child The child to measure 3565 * @param parentWidthMeasureSpec The width requirements for this view 3566 * @param parentHeightMeasureSpec The height requirements for this view 3567 */ 3568 protected void measureChild(View child, int parentWidthMeasureSpec, 3569 int parentHeightMeasureSpec) { 3570 final LayoutParams lp = child.getLayoutParams(); 3571 3572 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3573 mPaddingLeft + mPaddingRight, lp.width); 3574 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3575 mPaddingTop + mPaddingBottom, lp.height); 3576 3577 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3578 } 3579 3580 /** 3581 * Ask one of the children of this view to measure itself, taking into 3582 * account both the MeasureSpec requirements for this view and its padding 3583 * and margins. The child must have MarginLayoutParams The heavy lifting is 3584 * done in getChildMeasureSpec. 3585 * 3586 * @param child The child to measure 3587 * @param parentWidthMeasureSpec The width requirements for this view 3588 * @param widthUsed Extra space that has been used up by the parent 3589 * horizontally (possibly by other children of the parent) 3590 * @param parentHeightMeasureSpec The height requirements for this view 3591 * @param heightUsed Extra space that has been used up by the parent 3592 * vertically (possibly by other children of the parent) 3593 */ 3594 protected void measureChildWithMargins(View child, 3595 int parentWidthMeasureSpec, int widthUsed, 3596 int parentHeightMeasureSpec, int heightUsed) { 3597 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3598 3599 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3600 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3601 + widthUsed, lp.width); 3602 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3603 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3604 + heightUsed, lp.height); 3605 3606 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3607 } 3608 3609 /** 3610 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3611 * pass to a particular child. This method figures out the right MeasureSpec 3612 * for one dimension (height or width) of one child view. 3613 * 3614 * The goal is to combine information from our MeasureSpec with the 3615 * LayoutParams of the child to get the best possible results. For example, 3616 * if the this view knows its size (because its MeasureSpec has a mode of 3617 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3618 * to be the same size as the parent, the parent should ask the child to 3619 * layout given an exact size. 3620 * 3621 * @param spec The requirements for this view 3622 * @param padding The padding of this view for the current dimension and 3623 * margins, if applicable 3624 * @param childDimension How big the child wants to be in the current 3625 * dimension 3626 * @return a MeasureSpec integer for the child 3627 */ 3628 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3629 int specMode = MeasureSpec.getMode(spec); 3630 int specSize = MeasureSpec.getSize(spec); 3631 3632 int size = Math.max(0, specSize - padding); 3633 3634 int resultSize = 0; 3635 int resultMode = 0; 3636 3637 switch (specMode) { 3638 // Parent has imposed an exact size on us 3639 case MeasureSpec.EXACTLY: 3640 if (childDimension >= 0) { 3641 resultSize = childDimension; 3642 resultMode = MeasureSpec.EXACTLY; 3643 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3644 // Child wants to be our size. So be it. 3645 resultSize = size; 3646 resultMode = MeasureSpec.EXACTLY; 3647 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3648 // Child wants to determine its own size. It can't be 3649 // bigger than us. 3650 resultSize = size; 3651 resultMode = MeasureSpec.AT_MOST; 3652 } 3653 break; 3654 3655 // Parent has imposed a maximum size on us 3656 case MeasureSpec.AT_MOST: 3657 if (childDimension >= 0) { 3658 // Child wants a specific size... so be it 3659 resultSize = childDimension; 3660 resultMode = MeasureSpec.EXACTLY; 3661 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3662 // Child wants to be our size, but our size is not fixed. 3663 // Constrain child to not be bigger than us. 3664 resultSize = size; 3665 resultMode = MeasureSpec.AT_MOST; 3666 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3667 // Child wants to determine its own size. It can't be 3668 // bigger than us. 3669 resultSize = size; 3670 resultMode = MeasureSpec.AT_MOST; 3671 } 3672 break; 3673 3674 // Parent asked to see how big we want to be 3675 case MeasureSpec.UNSPECIFIED: 3676 if (childDimension >= 0) { 3677 // Child wants a specific size... let him have it 3678 resultSize = childDimension; 3679 resultMode = MeasureSpec.EXACTLY; 3680 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3681 // Child wants to be our size... find out how big it should 3682 // be 3683 resultSize = 0; 3684 resultMode = MeasureSpec.UNSPECIFIED; 3685 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3686 // Child wants to determine its own size.... find out how 3687 // big it should be 3688 resultSize = 0; 3689 resultMode = MeasureSpec.UNSPECIFIED; 3690 } 3691 break; 3692 } 3693 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3694 } 3695 3696 3697 /** 3698 * Removes any pending animations for views that have been removed. Call 3699 * this if you don't want animations for exiting views to stack up. 3700 */ 3701 public void clearDisappearingChildren() { 3702 if (mDisappearingChildren != null) { 3703 mDisappearingChildren.clear(); 3704 } 3705 } 3706 3707 /** 3708 * Add a view which is removed from mChildren but still needs animation 3709 * 3710 * @param v View to add 3711 */ 3712 private void addDisappearingView(View v) { 3713 ArrayList<View> disappearingChildren = mDisappearingChildren; 3714 3715 if (disappearingChildren == null) { 3716 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3717 } 3718 3719 disappearingChildren.add(v); 3720 } 3721 3722 /** 3723 * Cleanup a view when its animation is done. This may mean removing it from 3724 * the list of disappearing views. 3725 * 3726 * @param view The view whose animation has finished 3727 * @param animation The animation, cannot be null 3728 */ 3729 private void finishAnimatingView(final View view, Animation animation) { 3730 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3731 if (disappearingChildren != null) { 3732 if (disappearingChildren.contains(view)) { 3733 disappearingChildren.remove(view); 3734 3735 if (view.mAttachInfo != null) { 3736 view.dispatchDetachedFromWindow(); 3737 } 3738 3739 view.clearAnimation(); 3740 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3741 } 3742 } 3743 3744 if (animation != null && !animation.getFillAfter()) { 3745 view.clearAnimation(); 3746 } 3747 3748 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3749 view.onAnimationEnd(); 3750 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3751 // so we'd rather be safe than sorry 3752 view.mPrivateFlags &= ~ANIMATION_STARTED; 3753 // Draw one more frame after the animation is done 3754 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3755 } 3756 } 3757 3758 /** 3759 * This method tells the ViewGroup that the given View object, which should have this 3760 * ViewGroup as its parent, 3761 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 3762 * is removed from its parent. This allows animations, such as those used by 3763 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 3764 * the removal of views. A call to this method should always be accompanied by a later call 3765 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 3766 * so that the View finally gets removed. 3767 * 3768 * @param view The View object to be kept visible even if it gets removed from its parent. 3769 */ 3770 public void startViewTransition(View view) { 3771 if (view.mParent == this) { 3772 if (mTransitioningViews == null) { 3773 mTransitioningViews = new ArrayList<View>(); 3774 } 3775 mTransitioningViews.add(view); 3776 } 3777 } 3778 3779 /** 3780 * This method should always be called following an earlier call to 3781 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 3782 * and will no longer be displayed. Note that this method does not perform the functionality 3783 * of removing a view from its parent; it just discontinues the display of a View that 3784 * has previously been removed. 3785 * 3786 * @return view The View object that has been removed but is being kept around in the visible 3787 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 3788 */ 3789 public void endViewTransition(View view) { 3790 if (mTransitioningViews != null) { 3791 mTransitioningViews.remove(view); 3792 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3793 if (disappearingChildren != null && disappearingChildren.contains(view)) { 3794 disappearingChildren.remove(view); 3795 if (view.mAttachInfo != null) { 3796 view.dispatchDetachedFromWindow(); 3797 } 3798 if (view.mParent != null) { 3799 view.mParent = null; 3800 } 3801 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3802 } 3803 } 3804 } 3805 3806 private LayoutTransition.TransitionListener mLayoutTransitionListener = 3807 new LayoutTransition.TransitionListener() { 3808 @Override 3809 public void startTransition(LayoutTransition transition, ViewGroup container, 3810 View view, int transitionType) { 3811 // We only care about disappearing items, since we need special logic to keep 3812 // those items visible after they've been 'removed' 3813 if (transitionType == LayoutTransition.DISAPPEARING) { 3814 startViewTransition(view); 3815 } 3816 } 3817 3818 @Override 3819 public void endTransition(LayoutTransition transition, ViewGroup container, 3820 View view, int transitionType) { 3821 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 3822 endViewTransition(view); 3823 } 3824 } 3825 }; 3826 3827 /** 3828 * {@inheritDoc} 3829 */ 3830 @Override 3831 public boolean gatherTransparentRegion(Region region) { 3832 // If no transparent regions requested, we are always opaque. 3833 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3834 if (meOpaque && region == null) { 3835 // The caller doesn't care about the region, so stop now. 3836 return true; 3837 } 3838 super.gatherTransparentRegion(region); 3839 final View[] children = mChildren; 3840 final int count = mChildrenCount; 3841 boolean noneOfTheChildrenAreTransparent = true; 3842 for (int i = 0; i < count; i++) { 3843 final View child = children[i]; 3844 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3845 if (!child.gatherTransparentRegion(region)) { 3846 noneOfTheChildrenAreTransparent = false; 3847 } 3848 } 3849 } 3850 return meOpaque || noneOfTheChildrenAreTransparent; 3851 } 3852 3853 /** 3854 * {@inheritDoc} 3855 */ 3856 public void requestTransparentRegion(View child) { 3857 if (child != null) { 3858 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3859 if (mParent != null) { 3860 mParent.requestTransparentRegion(this); 3861 } 3862 } 3863 } 3864 3865 3866 @Override 3867 protected boolean fitSystemWindows(Rect insets) { 3868 boolean done = super.fitSystemWindows(insets); 3869 if (!done) { 3870 final int count = mChildrenCount; 3871 final View[] children = mChildren; 3872 for (int i = 0; i < count; i++) { 3873 done = children[i].fitSystemWindows(insets); 3874 if (done) { 3875 break; 3876 } 3877 } 3878 } 3879 return done; 3880 } 3881 3882 /** 3883 * Returns the animation listener to which layout animation events are 3884 * sent. 3885 * 3886 * @return an {@link android.view.animation.Animation.AnimationListener} 3887 */ 3888 public Animation.AnimationListener getLayoutAnimationListener() { 3889 return mAnimationListener; 3890 } 3891 3892 @Override 3893 protected void drawableStateChanged() { 3894 super.drawableStateChanged(); 3895 3896 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3897 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3898 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3899 + " child has duplicateParentState set to true"); 3900 } 3901 3902 final View[] children = mChildren; 3903 final int count = mChildrenCount; 3904 3905 for (int i = 0; i < count; i++) { 3906 final View child = children[i]; 3907 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3908 child.refreshDrawableState(); 3909 } 3910 } 3911 } 3912 } 3913 3914 @Override 3915 protected int[] onCreateDrawableState(int extraSpace) { 3916 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3917 return super.onCreateDrawableState(extraSpace); 3918 } 3919 3920 int need = 0; 3921 int n = getChildCount(); 3922 for (int i = 0; i < n; i++) { 3923 int[] childState = getChildAt(i).getDrawableState(); 3924 3925 if (childState != null) { 3926 need += childState.length; 3927 } 3928 } 3929 3930 int[] state = super.onCreateDrawableState(extraSpace + need); 3931 3932 for (int i = 0; i < n; i++) { 3933 int[] childState = getChildAt(i).getDrawableState(); 3934 3935 if (childState != null) { 3936 state = mergeDrawableStates(state, childState); 3937 } 3938 } 3939 3940 return state; 3941 } 3942 3943 /** 3944 * Sets whether this ViewGroup's drawable states also include 3945 * its children's drawable states. This is used, for example, to 3946 * make a group appear to be focused when its child EditText or button 3947 * is focused. 3948 */ 3949 public void setAddStatesFromChildren(boolean addsStates) { 3950 if (addsStates) { 3951 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3952 } else { 3953 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3954 } 3955 3956 refreshDrawableState(); 3957 } 3958 3959 /** 3960 * Returns whether this ViewGroup's drawable states also include 3961 * its children's drawable states. This is used, for example, to 3962 * make a group appear to be focused when its child EditText or button 3963 * is focused. 3964 */ 3965 public boolean addStatesFromChildren() { 3966 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3967 } 3968 3969 /** 3970 * If {link #addStatesFromChildren} is true, refreshes this group's 3971 * drawable state (to include the states from its children). 3972 */ 3973 public void childDrawableStateChanged(View child) { 3974 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3975 refreshDrawableState(); 3976 } 3977 } 3978 3979 /** 3980 * Specifies the animation listener to which layout animation events must 3981 * be sent. Only 3982 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3983 * and 3984 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3985 * are invoked. 3986 * 3987 * @param animationListener the layout animation listener 3988 */ 3989 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3990 mAnimationListener = animationListener; 3991 } 3992 3993 /** 3994 * LayoutParams are used by views to tell their parents how they want to be 3995 * laid out. See 3996 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3997 * for a list of all child view attributes that this class supports. 3998 * 3999 * <p> 4000 * The base LayoutParams class just describes how big the view wants to be 4001 * for both width and height. For each dimension, it can specify one of: 4002 * <ul> 4003 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 4004 * means that the view wants to be as big as its parent (minus padding) 4005 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 4006 * to enclose its content (plus padding) 4007 * <li> an exact number 4008 * </ul> 4009 * There are subclasses of LayoutParams for different subclasses of 4010 * ViewGroup. For example, AbsoluteLayout has its own subclass of 4011 * LayoutParams which adds an X and Y value. 4012 * 4013 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 4014 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 4015 */ 4016 public static class LayoutParams { 4017 /** 4018 * Special value for the height or width requested by a View. 4019 * FILL_PARENT means that the view wants to be as big as its parent, 4020 * minus the parent's padding, if any. This value is deprecated 4021 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 4022 */ 4023 @SuppressWarnings({"UnusedDeclaration"}) 4024 @Deprecated 4025 public static final int FILL_PARENT = -1; 4026 4027 /** 4028 * Special value for the height or width requested by a View. 4029 * MATCH_PARENT means that the view wants to be as big as its parent, 4030 * minus the parent's padding, if any. Introduced in API Level 8. 4031 */ 4032 public static final int MATCH_PARENT = -1; 4033 4034 /** 4035 * Special value for the height or width requested by a View. 4036 * WRAP_CONTENT means that the view wants to be just large enough to fit 4037 * its own internal content, taking its own padding into account. 4038 */ 4039 public static final int WRAP_CONTENT = -2; 4040 4041 /** 4042 * Information about how wide the view wants to be. Can be one of the 4043 * constants FILL_PARENT (replaced by MATCH_PARENT , 4044 * in API Level 8) or WRAP_CONTENT. or an exact size. 4045 */ 4046 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4047 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4048 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4049 }) 4050 public int width; 4051 4052 /** 4053 * Information about how tall the view wants to be. Can be one of the 4054 * constants FILL_PARENT (replaced by MATCH_PARENT , 4055 * in API Level 8) or WRAP_CONTENT. or an exact size. 4056 */ 4057 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4058 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 4059 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 4060 }) 4061 public int height; 4062 4063 /** 4064 * Used to animate layouts. 4065 */ 4066 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4067 4068 /** 4069 * Creates a new set of layout parameters. The values are extracted from 4070 * the supplied attributes set and context. The XML attributes mapped 4071 * to this set of layout parameters are: 4072 * 4073 * <ul> 4074 * <li><code>layout_width</code>: the width, either an exact value, 4075 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4076 * {@link #MATCH_PARENT} in API Level 8)</li> 4077 * <li><code>layout_height</code>: the height, either an exact value, 4078 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4079 * {@link #MATCH_PARENT} in API Level 8)</li> 4080 * </ul> 4081 * 4082 * @param c the application environment 4083 * @param attrs the set of attributes from which to extract the layout 4084 * parameters' values 4085 */ 4086 public LayoutParams(Context c, AttributeSet attrs) { 4087 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4088 setBaseAttributes(a, 4089 R.styleable.ViewGroup_Layout_layout_width, 4090 R.styleable.ViewGroup_Layout_layout_height); 4091 a.recycle(); 4092 } 4093 4094 /** 4095 * Creates a new set of layout parameters with the specified width 4096 * and height. 4097 * 4098 * @param width the width, either {@link #WRAP_CONTENT}, 4099 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4100 * API Level 8), or a fixed size in pixels 4101 * @param height the height, either {@link #WRAP_CONTENT}, 4102 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4103 * API Level 8), or a fixed size in pixels 4104 */ 4105 public LayoutParams(int width, int height) { 4106 this.width = width; 4107 this.height = height; 4108 } 4109 4110 /** 4111 * Copy constructor. Clones the width and height values of the source. 4112 * 4113 * @param source The layout params to copy from. 4114 */ 4115 public LayoutParams(LayoutParams source) { 4116 this.width = source.width; 4117 this.height = source.height; 4118 } 4119 4120 /** 4121 * Used internally by MarginLayoutParams. 4122 * @hide 4123 */ 4124 LayoutParams() { 4125 } 4126 4127 /** 4128 * Extracts the layout parameters from the supplied attributes. 4129 * 4130 * @param a the style attributes to extract the parameters from 4131 * @param widthAttr the identifier of the width attribute 4132 * @param heightAttr the identifier of the height attribute 4133 */ 4134 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4135 width = a.getLayoutDimension(widthAttr, "layout_width"); 4136 height = a.getLayoutDimension(heightAttr, "layout_height"); 4137 } 4138 4139 /** 4140 * Returns a String representation of this set of layout parameters. 4141 * 4142 * @param output the String to prepend to the internal representation 4143 * @return a String with the following format: output + 4144 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4145 * 4146 * @hide 4147 */ 4148 public String debug(String output) { 4149 return output + "ViewGroup.LayoutParams={ width=" 4150 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4151 } 4152 4153 /** 4154 * Converts the specified size to a readable String. 4155 * 4156 * @param size the size to convert 4157 * @return a String instance representing the supplied size 4158 * 4159 * @hide 4160 */ 4161 protected static String sizeToString(int size) { 4162 if (size == WRAP_CONTENT) { 4163 return "wrap-content"; 4164 } 4165 if (size == MATCH_PARENT) { 4166 return "match-parent"; 4167 } 4168 return String.valueOf(size); 4169 } 4170 } 4171 4172 /** 4173 * Per-child layout information for layouts that support margins. 4174 * See 4175 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4176 * for a list of all child view attributes that this class supports. 4177 */ 4178 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4179 /** 4180 * The left margin in pixels of the child. 4181 */ 4182 @ViewDebug.ExportedProperty(category = "layout") 4183 public int leftMargin; 4184 4185 /** 4186 * The top margin in pixels of the child. 4187 */ 4188 @ViewDebug.ExportedProperty(category = "layout") 4189 public int topMargin; 4190 4191 /** 4192 * The right margin in pixels of the child. 4193 */ 4194 @ViewDebug.ExportedProperty(category = "layout") 4195 public int rightMargin; 4196 4197 /** 4198 * The bottom margin in pixels of the child. 4199 */ 4200 @ViewDebug.ExportedProperty(category = "layout") 4201 public int bottomMargin; 4202 4203 /** 4204 * Creates a new set of layout parameters. The values are extracted from 4205 * the supplied attributes set and context. 4206 * 4207 * @param c the application environment 4208 * @param attrs the set of attributes from which to extract the layout 4209 * parameters' values 4210 */ 4211 public MarginLayoutParams(Context c, AttributeSet attrs) { 4212 super(); 4213 4214 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4215 setBaseAttributes(a, 4216 R.styleable.ViewGroup_MarginLayout_layout_width, 4217 R.styleable.ViewGroup_MarginLayout_layout_height); 4218 4219 int margin = a.getDimensionPixelSize( 4220 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4221 if (margin >= 0) { 4222 leftMargin = margin; 4223 topMargin = margin; 4224 rightMargin= margin; 4225 bottomMargin = margin; 4226 } else { 4227 leftMargin = a.getDimensionPixelSize( 4228 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4229 topMargin = a.getDimensionPixelSize( 4230 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4231 rightMargin = a.getDimensionPixelSize( 4232 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4233 bottomMargin = a.getDimensionPixelSize( 4234 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4235 } 4236 4237 a.recycle(); 4238 } 4239 4240 /** 4241 * {@inheritDoc} 4242 */ 4243 public MarginLayoutParams(int width, int height) { 4244 super(width, height); 4245 } 4246 4247 /** 4248 * Copy constructor. Clones the width, height and margin values of the source. 4249 * 4250 * @param source The layout params to copy from. 4251 */ 4252 public MarginLayoutParams(MarginLayoutParams source) { 4253 this.width = source.width; 4254 this.height = source.height; 4255 4256 this.leftMargin = source.leftMargin; 4257 this.topMargin = source.topMargin; 4258 this.rightMargin = source.rightMargin; 4259 this.bottomMargin = source.bottomMargin; 4260 } 4261 4262 /** 4263 * {@inheritDoc} 4264 */ 4265 public MarginLayoutParams(LayoutParams source) { 4266 super(source); 4267 } 4268 4269 /** 4270 * Sets the margins, in pixels. 4271 * 4272 * @param left the left margin size 4273 * @param top the top margin size 4274 * @param right the right margin size 4275 * @param bottom the bottom margin size 4276 * 4277 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4278 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4279 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4280 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4281 */ 4282 public void setMargins(int left, int top, int right, int bottom) { 4283 leftMargin = left; 4284 topMargin = top; 4285 rightMargin = right; 4286 bottomMargin = bottom; 4287 } 4288 } 4289 4290 private static class SplitMotionTargets { 4291 private SparseArray<View> mTargets; 4292 private TargetInfo[] mUniqueTargets; 4293 private int mUniqueTargetCount; 4294 private MotionEvent.PointerCoords[] mPointerCoords; 4295 private int[] mPointerIds; 4296 4297 private static final int INITIAL_UNIQUE_MOTION_TARGETS_SIZE = 5; 4298 private static final int INITIAL_BUCKET_SIZE = 5; 4299 4300 public SplitMotionTargets() { 4301 mTargets = new SparseArray<View>(); 4302 mUniqueTargets = new TargetInfo[INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4303 mPointerIds = new int[INITIAL_BUCKET_SIZE]; 4304 mPointerCoords = new MotionEvent.PointerCoords[INITIAL_BUCKET_SIZE]; 4305 for (int i = 0; i < INITIAL_BUCKET_SIZE; i++) { 4306 mPointerCoords[i] = new MotionEvent.PointerCoords(); 4307 } 4308 } 4309 4310 public void clear() { 4311 mTargets.clear(); 4312 final int count = mUniqueTargetCount; 4313 for (int i = 0; i < count; i++) { 4314 mUniqueTargets[i].recycle(); 4315 mUniqueTargets[i] = null; 4316 } 4317 mUniqueTargetCount = 0; 4318 } 4319 4320 public void add(int pointerId, View target, long downTime) { 4321 mTargets.put(pointerId, target); 4322 4323 final int uniqueCount = mUniqueTargetCount; 4324 boolean addUnique = true; 4325 for (int i = 0; i < uniqueCount; i++) { 4326 if (mUniqueTargets[i].view == target) { 4327 addUnique = false; 4328 } 4329 } 4330 if (addUnique) { 4331 if (mUniqueTargets.length == uniqueCount) { 4332 TargetInfo[] newTargets = 4333 new TargetInfo[uniqueCount + INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4334 System.arraycopy(mUniqueTargets, 0, newTargets, 0, uniqueCount); 4335 mUniqueTargets = newTargets; 4336 } 4337 mUniqueTargets[uniqueCount] = TargetInfo.obtain(target, downTime); 4338 mUniqueTargetCount++; 4339 } 4340 } 4341 4342 public int getIdCount() { 4343 return mTargets.size(); 4344 } 4345 4346 public int getUniqueTargetCount() { 4347 return mUniqueTargetCount; 4348 } 4349 4350 public TargetInfo getUniqueTargetAt(int index) { 4351 return mUniqueTargets[index]; 4352 } 4353 4354 public View get(int id) { 4355 return mTargets.get(id); 4356 } 4357 4358 public int indexOfTarget(View target) { 4359 return mTargets.indexOfValue(target); 4360 } 4361 4362 public View targetAt(int index) { 4363 return mTargets.valueAt(index); 4364 } 4365 4366 public TargetInfo getPrimaryTarget() { 4367 if (!isEmpty()) { 4368 // Find the longest-lived target 4369 long firstTime = Long.MAX_VALUE; 4370 int firstIndex = 0; 4371 final int uniqueCount = mUniqueTargetCount; 4372 for (int i = 0; i < uniqueCount; i++) { 4373 TargetInfo info = mUniqueTargets[i]; 4374 if (info.downTime < firstTime) { 4375 firstTime = info.downTime; 4376 firstIndex = i; 4377 } 4378 } 4379 return mUniqueTargets[firstIndex]; 4380 } 4381 return null; 4382 } 4383 4384 public boolean isEmpty() { 4385 return mUniqueTargetCount == 0; 4386 } 4387 4388 public void removeById(int id) { 4389 final int index = mTargets.indexOfKey(id); 4390 removeAt(index); 4391 } 4392 4393 public void removeView(View view) { 4394 int i = 0; 4395 while (i < mTargets.size()) { 4396 if (mTargets.valueAt(i) == view) { 4397 mTargets.removeAt(i); 4398 } else { 4399 i++; 4400 } 4401 } 4402 removeUnique(view); 4403 } 4404 4405 public void removeAt(int index) { 4406 if (index < 0 || index >= mTargets.size()) { 4407 return; 4408 } 4409 4410 final View removeView = mTargets.valueAt(index); 4411 mTargets.removeAt(index); 4412 if (mTargets.indexOfValue(removeView) < 0) { 4413 removeUnique(removeView); 4414 } 4415 } 4416 4417 private void removeUnique(View removeView) { 4418 TargetInfo[] unique = mUniqueTargets; 4419 int uniqueCount = mUniqueTargetCount; 4420 for (int i = 0; i < uniqueCount; i++) { 4421 if (unique[i].view == removeView) { 4422 unique[i].recycle(); 4423 unique[i] = unique[--uniqueCount]; 4424 unique[uniqueCount] = null; 4425 break; 4426 } 4427 } 4428 4429 mUniqueTargetCount = uniqueCount; 4430 } 4431 4432 /** 4433 * Return a new (obtain()ed) MotionEvent containing only data for pointers that should 4434 * be dispatched to child. Don't forget to recycle it! 4435 */ 4436 public MotionEvent filterMotionEventForChild(MotionEvent ev, View child, long downTime) { 4437 int action = ev.getAction(); 4438 final int maskedAction = action & MotionEvent.ACTION_MASK; 4439 4440 // Only send pointer up events if this child was the target. Drop it otherwise. 4441 if (maskedAction == MotionEvent.ACTION_POINTER_UP && 4442 get(ev.getPointerId(ev.getActionIndex())) != child) { 4443 return null; 4444 } 4445 4446 int pointerCount = 0; 4447 final int idCount = getIdCount(); 4448 for (int i = 0; i < idCount; i++) { 4449 if (targetAt(i) == child) { 4450 pointerCount++; 4451 } 4452 } 4453 4454 int actionId = -1; 4455 boolean needsNewIndex = false; // True if we should fill in the action's masked index 4456 4457 // If we have a down event, it wasn't counted above. 4458 if (maskedAction == MotionEvent.ACTION_DOWN) { 4459 pointerCount++; 4460 actionId = ev.getPointerId(0); 4461 } else if (maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 4462 pointerCount++; 4463 4464 actionId = ev.getPointerId(ev.getActionIndex()); 4465 4466 if (indexOfTarget(child) < 0) { 4467 // The new action should be ACTION_DOWN if this child isn't currently getting 4468 // any events. 4469 action = MotionEvent.ACTION_DOWN; 4470 } else { 4471 // Fill in the index portion of the action later. 4472 needsNewIndex = true; 4473 } 4474 } else if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 4475 actionId = ev.getPointerId(ev.getActionIndex()); 4476 if (pointerCount == 1) { 4477 // The new action should be ACTION_UP if there's only one pointer left for 4478 // this target. 4479 action = MotionEvent.ACTION_UP; 4480 } else { 4481 // Fill in the index portion of the action later. 4482 needsNewIndex = true; 4483 } 4484 } 4485 4486 if (pointerCount == 0) { 4487 return null; 4488 } 4489 4490 // Fill the buckets with pointer data! 4491 final int eventPointerCount = ev.getPointerCount(); 4492 int bucketIndex = 0; 4493 int newActionIndex = -1; 4494 for (int evp = 0; evp < eventPointerCount; evp++) { 4495 final int id = ev.getPointerId(evp); 4496 4497 // Add this pointer to the bucket if it is new or targeted at child 4498 if (id == actionId || get(id) == child) { 4499 // Expand scratch arrays if needed 4500 if (mPointerCoords.length <= bucketIndex) { 4501 int[] pointerIds = new int[pointerCount]; 4502 MotionEvent.PointerCoords[] pointerCoords = 4503 new MotionEvent.PointerCoords[pointerCount]; 4504 for (int i = mPointerCoords.length; i < pointerCoords.length; i++) { 4505 pointerCoords[i] = new MotionEvent.PointerCoords(); 4506 } 4507 4508 System.arraycopy(mPointerCoords, 0, 4509 pointerCoords, 0, mPointerCoords.length); 4510 System.arraycopy(mPointerIds, 0, pointerIds, 0, mPointerIds.length); 4511 4512 mPointerCoords = pointerCoords; 4513 mPointerIds = pointerIds; 4514 } 4515 4516 mPointerIds[bucketIndex] = id; 4517 ev.getPointerCoords(evp, mPointerCoords[bucketIndex]); 4518 4519 if (needsNewIndex && id == actionId) { 4520 newActionIndex = bucketIndex; 4521 } 4522 4523 bucketIndex++; 4524 } 4525 } 4526 4527 // Encode the new action index if we have one 4528 if (newActionIndex >= 0) { 4529 action = (action & MotionEvent.ACTION_MASK) | 4530 (newActionIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 4531 } 4532 4533 return MotionEvent.obtain(downTime, ev.getEventTime(), 4534 action, pointerCount, mPointerIds, mPointerCoords, ev.getMetaState(), 4535 ev.getXPrecision(), ev.getYPrecision(), ev.getDeviceId(), ev.getEdgeFlags(), 4536 ev.getSource(), ev.getFlags()); 4537 } 4538 4539 static class TargetInfo { 4540 public View view; 4541 public long downTime; 4542 4543 private TargetInfo mNextRecycled; 4544 4545 private static TargetInfo sRecycleBin; 4546 private static int sRecycledCount; 4547 4548 private static int MAX_RECYCLED = 15; 4549 4550 private TargetInfo() { 4551 } 4552 4553 public static TargetInfo obtain(View v, long time) { 4554 TargetInfo info; 4555 if (sRecycleBin == null) { 4556 info = new TargetInfo(); 4557 } else { 4558 info = sRecycleBin; 4559 sRecycleBin = info.mNextRecycled; 4560 sRecycledCount--; 4561 } 4562 info.view = v; 4563 info.downTime = time; 4564 return info; 4565 } 4566 4567 public void recycle() { 4568 if (sRecycledCount >= MAX_RECYCLED) { 4569 return; 4570 } 4571 mNextRecycled = sRecycleBin; 4572 sRecycleBin = this; 4573 sRecycledCount++; 4574 } 4575 } 4576 } 4577} 4578