ViewGroup.java revision df030d2c160ff42927c58ff54c51049c69a48312
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 com.android.internal.R; 20 21import android.content.Context; 22import android.content.res.Configuration; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Canvas; 26import android.graphics.Matrix; 27import android.graphics.Paint; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Parcelable; 32import android.os.SystemClock; 33import android.util.AttributeSet; 34import android.util.Config; 35import android.util.EventLog; 36import android.util.Log; 37import android.util.SparseArray; 38import android.view.ViewGroup.LayoutParams; 39import android.view.accessibility.AccessibilityEvent; 40import android.view.animation.Animation; 41import android.view.animation.AnimationUtils; 42import android.view.animation.LayoutAnimationController; 43import android.view.animation.Transformation; 44 45import java.util.ArrayList; 46 47/** 48 * <p> 49 * A <code>ViewGroup</code> is a special view that can contain other views 50 * (called children.) The view group is the base class for layouts and views 51 * containers. This class also defines the 52 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 53 * class for layouts parameters. 54 * </p> 55 * 56 * <p> 57 * Also see {@link LayoutParams} for layout attributes. 58 * </p> 59 * 60 * @attr ref android.R.styleable#ViewGroup_clipChildren 61 * @attr ref android.R.styleable#ViewGroup_clipToPadding 62 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 63 * @attr ref android.R.styleable#ViewGroup_animationCache 64 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 65 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 66 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 67 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 68 */ 69public abstract class ViewGroup extends View implements ViewParent, ViewManager { 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 // Layout animation 112 private LayoutAnimationController mLayoutAnimationController; 113 private Animation.AnimationListener mAnimationListener; 114 115 /** 116 * Internal flags. 117 * 118 * This field should be made private, so it is hidden from the SDK. 119 * {@hide} 120 */ 121 protected int mGroupFlags; 122 123 // When set, ViewGroup invalidates only the child's rectangle 124 // Set by default 125 private static final int FLAG_CLIP_CHILDREN = 0x1; 126 127 // When set, ViewGroup excludes the padding area from the invalidate rectangle 128 // Set by default 129 private static final int FLAG_CLIP_TO_PADDING = 0x2; 130 131 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 132 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 133 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 134 135 // When set, dispatchDraw() will run the layout animation and unset the flag 136 private static final int FLAG_RUN_ANIMATION = 0x8; 137 138 // When set, there is either no layout animation on the ViewGroup or the layout 139 // animation is over 140 // Set by default 141 private static final int FLAG_ANIMATION_DONE = 0x10; 142 143 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 144 // to clip it, even if FLAG_CLIP_TO_PADDING is set 145 private static final int FLAG_PADDING_NOT_NULL = 0x20; 146 147 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 148 // Set by default 149 private static final int FLAG_ANIMATION_CACHE = 0x40; 150 151 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 152 // layout animation; this avoid clobbering the hierarchy 153 // Automatically set when the layout animation starts, depending on the animation's 154 // characteristics 155 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 156 157 // When set, the next call to drawChild() will clear mChildTransformation's matrix 158 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 159 160 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 161 // the children's Bitmap caches if necessary 162 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 163 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 164 165 /** 166 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 167 * to get the index of the child to draw for that iteration. 168 * 169 * @hide 170 */ 171 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 172 173 /** 174 * When set, this ViewGroup supports static transformations on children; this causes 175 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 176 * invoked when a child is drawn. 177 * 178 * Any subclass overriding 179 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 180 * set this flags in {@link #mGroupFlags}. 181 * 182 * {@hide} 183 */ 184 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 185 186 // When the previous drawChild() invocation used an alpha value that was lower than 187 // 1.0 and set it in mCachePaint 188 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 189 190 /** 191 * When set, this ViewGroup's drawable states also include those 192 * of its children. 193 */ 194 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 195 196 /** 197 * When set, this ViewGroup tries to always draw its children using their drawing cache. 198 */ 199 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 200 201 /** 202 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 203 * draw its children with their drawing cache. 204 */ 205 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 206 207 /** 208 * When set, this group will go through its list of children to notify them of 209 * any drawable state change. 210 */ 211 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 212 213 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 214 215 /** 216 * This view will get focus before any of its descendants. 217 */ 218 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 219 220 /** 221 * This view will get focus only if none of its descendants want it. 222 */ 223 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 224 225 /** 226 * This view will block any of its descendants from getting focus, even 227 * if they are focusable. 228 */ 229 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 230 231 /** 232 * Used to map between enum in attrubutes and flag values. 233 */ 234 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 235 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 236 FOCUS_BLOCK_DESCENDANTS}; 237 238 /** 239 * When set, this ViewGroup should not intercept touch events. 240 * {@hide} 241 */ 242 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 243 244 /** 245 * Indicates which types of drawing caches are to be kept in memory. 246 * This field should be made private, so it is hidden from the SDK. 247 * {@hide} 248 */ 249 protected int mPersistentDrawingCache; 250 251 /** 252 * Used to indicate that no drawing cache should be kept in memory. 253 */ 254 public static final int PERSISTENT_NO_CACHE = 0x0; 255 256 /** 257 * Used to indicate that the animation drawing cache should be kept in memory. 258 */ 259 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 260 261 /** 262 * Used to indicate that the scrolling drawing cache should be kept in memory. 263 */ 264 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 265 266 /** 267 * Used to indicate that all drawing caches should be kept in memory. 268 */ 269 public static final int PERSISTENT_ALL_CACHES = 0x3; 270 271 /** 272 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 273 * are set at the same time. 274 */ 275 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 276 277 // Index of the child's left position in the mLocation array 278 private static final int CHILD_LEFT_INDEX = 0; 279 // Index of the child's top position in the mLocation array 280 private static final int CHILD_TOP_INDEX = 1; 281 282 // Child views of this ViewGroup 283 private View[] mChildren; 284 // Number of valid children in the mChildren array, the rest should be null or not 285 // considered as children 286 private int mChildrenCount; 287 288 private static final int ARRAY_INITIAL_CAPACITY = 12; 289 private static final int ARRAY_CAPACITY_INCREMENT = 12; 290 291 // Used to draw cached views 292 private final Paint mCachePaint = new Paint(); 293 294 public ViewGroup(Context context) { 295 super(context); 296 initViewGroup(); 297 } 298 299 public ViewGroup(Context context, AttributeSet attrs) { 300 super(context, attrs); 301 initViewGroup(); 302 initFromAttributes(context, attrs); 303 } 304 305 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 306 super(context, attrs, defStyle); 307 initViewGroup(); 308 initFromAttributes(context, attrs); 309 } 310 311 private void initViewGroup() { 312 // ViewGroup doesn't draw by default 313 setFlags(WILL_NOT_DRAW, DRAW_MASK); 314 mGroupFlags |= FLAG_CLIP_CHILDREN; 315 mGroupFlags |= FLAG_CLIP_TO_PADDING; 316 mGroupFlags |= FLAG_ANIMATION_DONE; 317 mGroupFlags |= FLAG_ANIMATION_CACHE; 318 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 319 320 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 321 322 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 323 mChildrenCount = 0; 324 325 mCachePaint.setDither(false); 326 327 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 328 } 329 330 private void initFromAttributes(Context context, AttributeSet attrs) { 331 TypedArray a = context.obtainStyledAttributes(attrs, 332 R.styleable.ViewGroup); 333 334 final int N = a.getIndexCount(); 335 for (int i = 0; i < N; i++) { 336 int attr = a.getIndex(i); 337 switch (attr) { 338 case R.styleable.ViewGroup_clipChildren: 339 setClipChildren(a.getBoolean(attr, true)); 340 break; 341 case R.styleable.ViewGroup_clipToPadding: 342 setClipToPadding(a.getBoolean(attr, true)); 343 break; 344 case R.styleable.ViewGroup_animationCache: 345 setAnimationCacheEnabled(a.getBoolean(attr, true)); 346 break; 347 case R.styleable.ViewGroup_persistentDrawingCache: 348 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 349 break; 350 case R.styleable.ViewGroup_addStatesFromChildren: 351 setAddStatesFromChildren(a.getBoolean(attr, false)); 352 break; 353 case R.styleable.ViewGroup_alwaysDrawnWithCache: 354 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 355 break; 356 case R.styleable.ViewGroup_layoutAnimation: 357 int id = a.getResourceId(attr, -1); 358 if (id > 0) { 359 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 360 } 361 break; 362 case R.styleable.ViewGroup_descendantFocusability: 363 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 364 break; 365 } 366 } 367 368 a.recycle(); 369 } 370 371 /** 372 * Gets the descendant focusability of this view group. The descendant 373 * focusability defines the relationship between this view group and its 374 * descendants when looking for a view to take focus in 375 * {@link #requestFocus(int, android.graphics.Rect)}. 376 * 377 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 378 * {@link #FOCUS_BLOCK_DESCENDANTS}. 379 */ 380 @ViewDebug.ExportedProperty(mapping = { 381 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 382 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 383 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 384 }) 385 public int getDescendantFocusability() { 386 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 387 } 388 389 /** 390 * Set the descendant focusability of this view group. This defines the relationship 391 * between this view group and its descendants when looking for a view to 392 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 393 * 394 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 395 * {@link #FOCUS_BLOCK_DESCENDANTS}. 396 */ 397 public void setDescendantFocusability(int focusability) { 398 switch (focusability) { 399 case FOCUS_BEFORE_DESCENDANTS: 400 case FOCUS_AFTER_DESCENDANTS: 401 case FOCUS_BLOCK_DESCENDANTS: 402 break; 403 default: 404 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 405 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 406 } 407 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 408 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 409 } 410 411 /** 412 * {@inheritDoc} 413 */ 414 @Override 415 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 416 if (mFocused != null) { 417 mFocused.unFocus(); 418 mFocused = null; 419 } 420 super.handleFocusGainInternal(direction, previouslyFocusedRect); 421 } 422 423 /** 424 * {@inheritDoc} 425 */ 426 public void requestChildFocus(View child, View focused) { 427 if (DBG) { 428 System.out.println(this + " requestChildFocus()"); 429 } 430 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 431 return; 432 } 433 434 // Unfocus us, if necessary 435 super.unFocus(); 436 437 // We had a previous notion of who had focus. Clear it. 438 if (mFocused != child) { 439 if (mFocused != null) { 440 mFocused.unFocus(); 441 } 442 443 mFocused = child; 444 } 445 if (mParent != null) { 446 mParent.requestChildFocus(this, focused); 447 } 448 } 449 450 /** 451 * {@inheritDoc} 452 */ 453 public void focusableViewAvailable(View v) { 454 if (mParent != null 455 // shortcut: don't report a new focusable view if we block our descendants from 456 // getting focus 457 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 458 // shortcut: don't report a new focusable view if we already are focused 459 // (and we don't prefer our descendants) 460 // 461 // note: knowing that mFocused is non-null is not a good enough reason 462 // to break the traversal since in that case we'd actually have to find 463 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 464 // an ancestor of v; this will get checked for at ViewRoot 465 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 466 mParent.focusableViewAvailable(v); 467 } 468 } 469 470 /** 471 * {@inheritDoc} 472 */ 473 public boolean showContextMenuForChild(View originalView) { 474 return mParent != null && mParent.showContextMenuForChild(originalView); 475 } 476 477 /** 478 * {@inheritDoc} 479 */ 480 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 481 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 482 } 483 484 /** 485 * Find the nearest view in the specified direction that wants to take 486 * focus. 487 * 488 * @param focused The view that currently has focus 489 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 490 * FOCUS_RIGHT, or 0 for not applicable. 491 */ 492 public View focusSearch(View focused, int direction) { 493 if (isRootNamespace()) { 494 // root namespace means we should consider ourselves the top of the 495 // tree for focus searching; otherwise we could be focus searching 496 // into other tabs. see LocalActivityManager and TabHost for more info 497 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 498 } else if (mParent != null) { 499 return mParent.focusSearch(focused, direction); 500 } 501 return null; 502 } 503 504 /** 505 * {@inheritDoc} 506 */ 507 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 508 return false; 509 } 510 511 /** 512 * {@inheritDoc} 513 */ 514 @Override 515 public boolean dispatchUnhandledMove(View focused, int direction) { 516 return mFocused != null && 517 mFocused.dispatchUnhandledMove(focused, direction); 518 } 519 520 /** 521 * {@inheritDoc} 522 */ 523 public void clearChildFocus(View child) { 524 if (DBG) { 525 System.out.println(this + " clearChildFocus()"); 526 } 527 528 mFocused = null; 529 if (mParent != null) { 530 mParent.clearChildFocus(this); 531 } 532 } 533 534 /** 535 * {@inheritDoc} 536 */ 537 @Override 538 public void clearFocus() { 539 super.clearFocus(); 540 541 // clear any child focus if it exists 542 if (mFocused != null) { 543 mFocused.clearFocus(); 544 } 545 } 546 547 /** 548 * {@inheritDoc} 549 */ 550 @Override 551 void unFocus() { 552 if (DBG) { 553 System.out.println(this + " unFocus()"); 554 } 555 556 super.unFocus(); 557 if (mFocused != null) { 558 mFocused.unFocus(); 559 } 560 mFocused = null; 561 } 562 563 /** 564 * Returns the focused child of this view, if any. The child may have focus 565 * or contain focus. 566 * 567 * @return the focused child or null. 568 */ 569 public View getFocusedChild() { 570 return mFocused; 571 } 572 573 /** 574 * Returns true if this view has or contains focus 575 * 576 * @return true if this view has or contains focus 577 */ 578 @Override 579 public boolean hasFocus() { 580 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 581 } 582 583 /* 584 * (non-Javadoc) 585 * 586 * @see android.view.View#findFocus() 587 */ 588 @Override 589 public View findFocus() { 590 if (DBG) { 591 System.out.println("Find focus in " + this + ": flags=" 592 + isFocused() + ", child=" + mFocused); 593 } 594 595 if (isFocused()) { 596 return this; 597 } 598 599 if (mFocused != null) { 600 return mFocused.findFocus(); 601 } 602 return null; 603 } 604 605 /** 606 * {@inheritDoc} 607 */ 608 @Override 609 public boolean hasFocusable() { 610 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 611 return false; 612 } 613 614 if (isFocusable()) { 615 return true; 616 } 617 618 final int descendantFocusability = getDescendantFocusability(); 619 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 620 final int count = mChildrenCount; 621 final View[] children = mChildren; 622 623 for (int i = 0; i < count; i++) { 624 final View child = children[i]; 625 if (child.hasFocusable()) { 626 return true; 627 } 628 } 629 } 630 631 return false; 632 } 633 634 /** 635 * {@inheritDoc} 636 */ 637 @Override 638 public void addFocusables(ArrayList<View> views, int direction) { 639 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 640 } 641 642 /** 643 * {@inheritDoc} 644 */ 645 @Override 646 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 647 final int focusableCount = views.size(); 648 649 final int descendantFocusability = getDescendantFocusability(); 650 651 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 652 final int count = mChildrenCount; 653 final View[] children = mChildren; 654 655 for (int i = 0; i < count; i++) { 656 final View child = children[i]; 657 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 658 child.addFocusables(views, direction, focusableMode); 659 } 660 } 661 } 662 663 // we add ourselves (if focusable) in all cases except for when we are 664 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 665 // to avoid the focus search finding layouts when a more precise search 666 // among the focusable children would be more interesting. 667 if ( 668 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 669 // No focusable descendants 670 (focusableCount == views.size())) { 671 super.addFocusables(views, direction, focusableMode); 672 } 673 } 674 675 /** 676 * {@inheritDoc} 677 */ 678 @Override 679 public void dispatchWindowFocusChanged(boolean hasFocus) { 680 super.dispatchWindowFocusChanged(hasFocus); 681 final int count = mChildrenCount; 682 final View[] children = mChildren; 683 for (int i = 0; i < count; i++) { 684 children[i].dispatchWindowFocusChanged(hasFocus); 685 } 686 } 687 688 /** 689 * {@inheritDoc} 690 */ 691 @Override 692 public void addTouchables(ArrayList<View> views) { 693 super.addTouchables(views); 694 695 final int count = mChildrenCount; 696 final View[] children = mChildren; 697 698 for (int i = 0; i < count; i++) { 699 final View child = children[i]; 700 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 701 child.addTouchables(views); 702 } 703 } 704 } 705 706 /** 707 * {@inheritDoc} 708 */ 709 @Override 710 public void dispatchDisplayHint(int hint) { 711 super.dispatchDisplayHint(hint); 712 final int count = mChildrenCount; 713 final View[] children = mChildren; 714 for (int i = 0; i < count; i++) { 715 children[i].dispatchDisplayHint(hint); 716 } 717 } 718 719 /** 720 * {@inheritDoc} 721 */ 722 @Override 723 protected void dispatchVisibilityChanged(View changedView, int visibility) { 724 super.dispatchVisibilityChanged(changedView, visibility); 725 final int count = mChildrenCount; 726 final View[] children = mChildren; 727 for (int i = 0; i < count; i++) { 728 children[i].dispatchVisibilityChanged(changedView, visibility); 729 } 730 } 731 732 /** 733 * {@inheritDoc} 734 */ 735 @Override 736 public void dispatchWindowVisibilityChanged(int visibility) { 737 super.dispatchWindowVisibilityChanged(visibility); 738 final int count = mChildrenCount; 739 final View[] children = mChildren; 740 for (int i = 0; i < count; i++) { 741 children[i].dispatchWindowVisibilityChanged(visibility); 742 } 743 } 744 745 /** 746 * {@inheritDoc} 747 */ 748 @Override 749 public void dispatchConfigurationChanged(Configuration newConfig) { 750 super.dispatchConfigurationChanged(newConfig); 751 final int count = mChildrenCount; 752 final View[] children = mChildren; 753 for (int i = 0; i < count; i++) { 754 children[i].dispatchConfigurationChanged(newConfig); 755 } 756 } 757 758 /** 759 * {@inheritDoc} 760 */ 761 public void recomputeViewAttributes(View child) { 762 ViewParent parent = mParent; 763 if (parent != null) parent.recomputeViewAttributes(this); 764 } 765 766 @Override 767 void dispatchCollectViewAttributes(int visibility) { 768 visibility |= mViewFlags&VISIBILITY_MASK; 769 super.dispatchCollectViewAttributes(visibility); 770 final int count = mChildrenCount; 771 final View[] children = mChildren; 772 for (int i = 0; i < count; i++) { 773 children[i].dispatchCollectViewAttributes(visibility); 774 } 775 } 776 777 /** 778 * {@inheritDoc} 779 */ 780 public void bringChildToFront(View child) { 781 int index = indexOfChild(child); 782 if (index >= 0) { 783 removeFromArray(index); 784 addInArray(child, mChildrenCount); 785 child.mParent = this; 786 } 787 } 788 789 /** 790 * {@inheritDoc} 791 */ 792 @Override 793 public boolean dispatchKeyEventPreIme(KeyEvent event) { 794 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 795 return super.dispatchKeyEventPreIme(event); 796 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 797 return mFocused.dispatchKeyEventPreIme(event); 798 } 799 return false; 800 } 801 802 /** 803 * {@inheritDoc} 804 */ 805 @Override 806 public boolean dispatchKeyEvent(KeyEvent event) { 807 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 808 return super.dispatchKeyEvent(event); 809 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 810 return mFocused.dispatchKeyEvent(event); 811 } 812 return false; 813 } 814 815 /** 816 * {@inheritDoc} 817 */ 818 @Override 819 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 820 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 821 return super.dispatchKeyShortcutEvent(event); 822 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 823 return mFocused.dispatchKeyShortcutEvent(event); 824 } 825 return false; 826 } 827 828 /** 829 * {@inheritDoc} 830 */ 831 @Override 832 public boolean dispatchTrackballEvent(MotionEvent event) { 833 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 834 return super.dispatchTrackballEvent(event); 835 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 836 return mFocused.dispatchTrackballEvent(event); 837 } 838 return false; 839 } 840 841 /** 842 * {@inheritDoc} 843 */ 844 @Override 845 public boolean dispatchTouchEvent(MotionEvent ev) { 846 final int action = ev.getAction(); 847 final float xf = ev.getX(); 848 final float yf = ev.getY(); 849 final float scrolledXFloat = xf + mScrollX; 850 final float scrolledYFloat = yf + mScrollY; 851 852 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 853 854 if (action == MotionEvent.ACTION_DOWN) { 855 if (mMotionTarget != null) { 856 // this is weird, we got a pen down, but we thought it was 857 // already down! 858 // XXX: We should probably send an ACTION_UP to the current 859 // target. 860 mMotionTarget = null; 861 } 862 // If we're disallowing intercept or if we're allowing and we didn't 863 // intercept 864 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 865 // reset this event's action (just to protect ourselves) 866 ev.setAction(MotionEvent.ACTION_DOWN); 867 // We know we want to dispatch the event down, find a child 868 // who can handle it, start with the front-most child. 869 final View[] children = mChildren; 870 final int count = mChildrenCount; 871 for (int i = count - 1; i >= 0; i--) { 872 final View child = children[i]; 873 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 874 || child.getAnimation() != null) { 875 if (child.dispatchTouchEvent(ev, scrolledXFloat, scrolledYFloat)) { 876 mMotionTarget = child; 877 return true; 878 } 879 } 880 } 881 } 882 } 883 884 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 885 (action == MotionEvent.ACTION_CANCEL); 886 887 if (isUpOrCancel) { 888 // Note, we've already copied the previous state to our local 889 // variable, so this takes effect on the next event 890 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 891 } 892 893 // The event wasn't an ACTION_DOWN, dispatch it to our target if 894 // we have one. 895 final View target = mMotionTarget; 896 if (target == null) { 897 // We don't have a target, this means we're handling the 898 // event as a regular view. 899 ev.setLocation(xf, yf); 900 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 901 ev.setAction(MotionEvent.ACTION_CANCEL); 902 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 903 } 904 return super.dispatchTouchEvent(ev); 905 } 906 907 // Calculate the offset point into the target's local coordinates 908 float xc; 909 float yc; 910 if (target.hasIdentityMatrix() || mAttachInfo == null) { 911 xc = scrolledXFloat - (float) target.mLeft; 912 yc = scrolledYFloat - (float) target.mTop; 913 } else { 914 // non-identity matrix: transform the point into the view's coordinates 915 final float[] localXY = mAttachInfo.mTmpTransformLocation; 916 localXY[0] = scrolledXFloat; 917 localXY[1] = scrolledYFloat; 918 target.getInverseMatrix().mapPoints(localXY); 919 xc = localXY[0] - (float) target.mLeft; 920 yc = localXY[1] - (float) target.mTop; 921 } 922 923 // if have a target, see if we're allowed to and want to intercept its 924 // events 925 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 926 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 927 ev.setAction(MotionEvent.ACTION_CANCEL); 928 ev.setLocation(xc, yc); 929 if (!target.dispatchTouchEvent(ev)) { 930 // target didn't handle ACTION_CANCEL. not much we can do 931 // but they should have. 932 } 933 // clear the target 934 mMotionTarget = null; 935 // Don't dispatch this event to our own view, because we already 936 // saw it when intercepting; we just want to give the following 937 // event to the normal onTouchEvent(). 938 return true; 939 } 940 941 if (isUpOrCancel) { 942 mMotionTarget = null; 943 } 944 945 // finally offset the event to the target's coordinate system and 946 // dispatch the event. 947 ev.setLocation(xc, yc); 948 949 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 950 ev.setAction(MotionEvent.ACTION_CANCEL); 951 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 952 mMotionTarget = null; 953 } 954 955 return target.dispatchTouchEvent(ev); 956 } 957 958 /** 959 * {@inheritDoc} 960 */ 961 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 962 963 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 964 // We're already in this state, assume our ancestors are too 965 return; 966 } 967 968 if (disallowIntercept) { 969 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 970 } else { 971 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 972 } 973 974 // Pass it up to our parent 975 if (mParent != null) { 976 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 977 } 978 } 979 980 /** 981 * Implement this method to intercept all touch screen motion events. This 982 * allows you to watch events as they are dispatched to your children, and 983 * take ownership of the current gesture at any point. 984 * 985 * <p>Using this function takes some care, as it has a fairly complicated 986 * interaction with {@link View#onTouchEvent(MotionEvent) 987 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 988 * that method as well as this one in the correct way. Events will be 989 * received in the following order: 990 * 991 * <ol> 992 * <li> You will receive the down event here. 993 * <li> The down event will be handled either by a child of this view 994 * group, or given to your own onTouchEvent() method to handle; this means 995 * you should implement onTouchEvent() to return true, so you will 996 * continue to see the rest of the gesture (instead of looking for 997 * a parent view to handle it). Also, by returning true from 998 * onTouchEvent(), you will not receive any following 999 * events in onInterceptTouchEvent() and all touch processing must 1000 * happen in onTouchEvent() like normal. 1001 * <li> For as long as you return false from this function, each following 1002 * event (up to and including the final up) will be delivered first here 1003 * and then to the target's onTouchEvent(). 1004 * <li> If you return true from here, you will not receive any 1005 * following events: the target view will receive the same event but 1006 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1007 * events will be delivered to your onTouchEvent() method and no longer 1008 * appear here. 1009 * </ol> 1010 * 1011 * @param ev The motion event being dispatched down the hierarchy. 1012 * @return Return true to steal motion events from the children and have 1013 * them dispatched to this ViewGroup through onTouchEvent(). 1014 * The current target will receive an ACTION_CANCEL event, and no further 1015 * messages will be delivered here. 1016 */ 1017 public boolean onInterceptTouchEvent(MotionEvent ev) { 1018 return false; 1019 } 1020 1021 /** 1022 * {@inheritDoc} 1023 * 1024 * Looks for a view to give focus to respecting the setting specified by 1025 * {@link #getDescendantFocusability()}. 1026 * 1027 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1028 * find focus within the children of this group when appropriate. 1029 * 1030 * @see #FOCUS_BEFORE_DESCENDANTS 1031 * @see #FOCUS_AFTER_DESCENDANTS 1032 * @see #FOCUS_BLOCK_DESCENDANTS 1033 * @see #onRequestFocusInDescendants 1034 */ 1035 @Override 1036 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1037 if (DBG) { 1038 System.out.println(this + " ViewGroup.requestFocus direction=" 1039 + direction); 1040 } 1041 int descendantFocusability = getDescendantFocusability(); 1042 1043 switch (descendantFocusability) { 1044 case FOCUS_BLOCK_DESCENDANTS: 1045 return super.requestFocus(direction, previouslyFocusedRect); 1046 case FOCUS_BEFORE_DESCENDANTS: { 1047 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1048 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1049 } 1050 case FOCUS_AFTER_DESCENDANTS: { 1051 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1052 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1053 } 1054 default: 1055 throw new IllegalStateException("descendant focusability must be " 1056 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1057 + "but is " + descendantFocusability); 1058 } 1059 } 1060 1061 /** 1062 * Look for a descendant to call {@link View#requestFocus} on. 1063 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1064 * when it wants to request focus within its children. Override this to 1065 * customize how your {@link ViewGroup} requests focus within its children. 1066 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1067 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1068 * to give a finer grained hint about where focus is coming from. May be null 1069 * if there is no hint. 1070 * @return Whether focus was taken. 1071 */ 1072 @SuppressWarnings({"ConstantConditions"}) 1073 protected boolean onRequestFocusInDescendants(int direction, 1074 Rect previouslyFocusedRect) { 1075 int index; 1076 int increment; 1077 int end; 1078 int count = mChildrenCount; 1079 if ((direction & FOCUS_FORWARD) != 0) { 1080 index = 0; 1081 increment = 1; 1082 end = count; 1083 } else { 1084 index = count - 1; 1085 increment = -1; 1086 end = -1; 1087 } 1088 final View[] children = mChildren; 1089 for (int i = index; i != end; i += increment) { 1090 View child = children[i]; 1091 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1092 if (child.requestFocus(direction, previouslyFocusedRect)) { 1093 return true; 1094 } 1095 } 1096 } 1097 return false; 1098 } 1099 1100 /** 1101 * {@inheritDoc} 1102 * 1103 * @hide 1104 */ 1105 @Override 1106 public void dispatchStartTemporaryDetach() { 1107 super.dispatchStartTemporaryDetach(); 1108 final int count = mChildrenCount; 1109 final View[] children = mChildren; 1110 for (int i = 0; i < count; i++) { 1111 children[i].dispatchStartTemporaryDetach(); 1112 } 1113 } 1114 1115 /** 1116 * {@inheritDoc} 1117 * 1118 * @hide 1119 */ 1120 @Override 1121 public void dispatchFinishTemporaryDetach() { 1122 super.dispatchFinishTemporaryDetach(); 1123 final int count = mChildrenCount; 1124 final View[] children = mChildren; 1125 for (int i = 0; i < count; i++) { 1126 children[i].dispatchFinishTemporaryDetach(); 1127 } 1128 } 1129 1130 /** 1131 * {@inheritDoc} 1132 */ 1133 @Override 1134 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1135 super.dispatchAttachedToWindow(info, visibility); 1136 visibility |= mViewFlags & VISIBILITY_MASK; 1137 final int count = mChildrenCount; 1138 final View[] children = mChildren; 1139 for (int i = 0; i < count; i++) { 1140 children[i].dispatchAttachedToWindow(info, visibility); 1141 } 1142 } 1143 1144 @Override 1145 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1146 boolean populated = false; 1147 for (int i = 0, count = getChildCount(); i < count; i++) { 1148 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1149 } 1150 return populated; 1151 } 1152 1153 /** 1154 * {@inheritDoc} 1155 */ 1156 @Override 1157 void dispatchDetachedFromWindow() { 1158 // If we still have a motion target, we are still in the process of 1159 // dispatching motion events to a child; we need to get rid of that 1160 // child to avoid dispatching events to it after the window is torn 1161 // down. To make sure we keep the child in a consistent state, we 1162 // first send it an ACTION_CANCEL motion event. 1163 if (mMotionTarget != null) { 1164 final long now = SystemClock.uptimeMillis(); 1165 final MotionEvent event = MotionEvent.obtain(now, now, 1166 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1167 mMotionTarget.dispatchTouchEvent(event); 1168 event.recycle(); 1169 mMotionTarget = null; 1170 } 1171 1172 final int count = mChildrenCount; 1173 final View[] children = mChildren; 1174 for (int i = 0; i < count; i++) { 1175 children[i].dispatchDetachedFromWindow(); 1176 } 1177 super.dispatchDetachedFromWindow(); 1178 } 1179 1180 /** 1181 * {@inheritDoc} 1182 */ 1183 @Override 1184 public void setPadding(int left, int top, int right, int bottom) { 1185 super.setPadding(left, top, right, bottom); 1186 1187 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1188 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1189 } else { 1190 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1191 } 1192 } 1193 1194 /** 1195 * {@inheritDoc} 1196 */ 1197 @Override 1198 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1199 super.dispatchSaveInstanceState(container); 1200 final int count = mChildrenCount; 1201 final View[] children = mChildren; 1202 for (int i = 0; i < count; i++) { 1203 View c = children[i]; 1204 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1205 c.dispatchSaveInstanceState(container); 1206 } 1207 } 1208 } 1209 1210 /** 1211 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1212 * not to its children. For use when overriding 1213 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1214 * their own state but not the state of their children. 1215 * 1216 * @param container the container 1217 */ 1218 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1219 super.dispatchSaveInstanceState(container); 1220 } 1221 1222 /** 1223 * {@inheritDoc} 1224 */ 1225 @Override 1226 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1227 super.dispatchRestoreInstanceState(container); 1228 final int count = mChildrenCount; 1229 final View[] children = mChildren; 1230 for (int i = 0; i < count; i++) { 1231 View c = children[i]; 1232 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1233 c.dispatchRestoreInstanceState(container); 1234 } 1235 } 1236 } 1237 1238 /** 1239 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1240 * not to its children. For use when overriding 1241 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1242 * their own state but not the state of their children. 1243 * 1244 * @param container the container 1245 */ 1246 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1247 super.dispatchRestoreInstanceState(container); 1248 } 1249 1250 /** 1251 * Enables or disables the drawing cache for each child of this view group. 1252 * 1253 * @param enabled true to enable the cache, false to dispose of it 1254 */ 1255 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1256 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1257 final View[] children = mChildren; 1258 final int count = mChildrenCount; 1259 for (int i = 0; i < count; i++) { 1260 children[i].setDrawingCacheEnabled(enabled); 1261 } 1262 } 1263 } 1264 1265 @Override 1266 protected void onAnimationStart() { 1267 super.onAnimationStart(); 1268 1269 // When this ViewGroup's animation starts, build the cache for the children 1270 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1271 final int count = mChildrenCount; 1272 final View[] children = mChildren; 1273 1274 for (int i = 0; i < count; i++) { 1275 final View child = children[i]; 1276 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1277 child.setDrawingCacheEnabled(true); 1278 child.buildDrawingCache(true); 1279 } 1280 } 1281 1282 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1283 } 1284 } 1285 1286 @Override 1287 protected void onAnimationEnd() { 1288 super.onAnimationEnd(); 1289 1290 // When this ViewGroup's animation ends, destroy the cache of the children 1291 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1292 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1293 1294 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1295 setChildrenDrawingCacheEnabled(false); 1296 } 1297 } 1298 } 1299 1300 @Override 1301 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1302 int count = mChildrenCount; 1303 int[] visibilities = null; 1304 1305 if (skipChildren) { 1306 visibilities = new int[count]; 1307 for (int i = 0; i < count; i++) { 1308 View child = getChildAt(i); 1309 visibilities[i] = child.getVisibility(); 1310 if (visibilities[i] == View.VISIBLE) { 1311 child.setVisibility(INVISIBLE); 1312 } 1313 } 1314 } 1315 1316 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1317 1318 if (skipChildren) { 1319 for (int i = 0; i < count; i++) { 1320 getChildAt(i).setVisibility(visibilities[i]); 1321 } 1322 } 1323 1324 return b; 1325 } 1326 1327 /** 1328 * {@inheritDoc} 1329 */ 1330 @Override 1331 protected void dispatchDraw(Canvas canvas) { 1332 final int count = mChildrenCount; 1333 final View[] children = mChildren; 1334 int flags = mGroupFlags; 1335 1336 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1337 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1338 1339 for (int i = 0; i < count; i++) { 1340 final View child = children[i]; 1341 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1342 final LayoutParams params = child.getLayoutParams(); 1343 attachLayoutAnimationParameters(child, params, i, count); 1344 bindLayoutAnimation(child); 1345 if (cache) { 1346 child.setDrawingCacheEnabled(true); 1347 child.buildDrawingCache(true); 1348 } 1349 } 1350 } 1351 1352 final LayoutAnimationController controller = mLayoutAnimationController; 1353 if (controller.willOverlap()) { 1354 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1355 } 1356 1357 controller.start(); 1358 1359 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1360 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1361 1362 if (cache) { 1363 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1364 } 1365 1366 if (mAnimationListener != null) { 1367 mAnimationListener.onAnimationStart(controller.getAnimation()); 1368 } 1369 } 1370 1371 int saveCount = 0; 1372 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1373 if (clipToPadding) { 1374 saveCount = canvas.save(); 1375 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1376 mScrollX + mRight - mLeft - mPaddingRight, 1377 mScrollY + mBottom - mTop - mPaddingBottom); 1378 1379 } 1380 1381 // We will draw our child's animation, let's reset the flag 1382 mPrivateFlags &= ~DRAW_ANIMATION; 1383 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1384 1385 boolean more = false; 1386 final long drawingTime = getDrawingTime(); 1387 1388 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1389 for (int i = 0; i < count; i++) { 1390 final View child = children[i]; 1391 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1392 more |= drawChild(canvas, child, drawingTime); 1393 } 1394 } 1395 } else { 1396 for (int i = 0; i < count; i++) { 1397 final View child = children[getChildDrawingOrder(count, i)]; 1398 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1399 more |= drawChild(canvas, child, drawingTime); 1400 } 1401 } 1402 } 1403 1404 // Draw any disappearing views that have animations 1405 if (mDisappearingChildren != null) { 1406 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1407 final int disappearingCount = disappearingChildren.size() - 1; 1408 // Go backwards -- we may delete as animations finish 1409 for (int i = disappearingCount; i >= 0; i--) { 1410 final View child = disappearingChildren.get(i); 1411 more |= drawChild(canvas, child, drawingTime); 1412 } 1413 } 1414 1415 if (clipToPadding) { 1416 canvas.restoreToCount(saveCount); 1417 } 1418 1419 // mGroupFlags might have been updated by drawChild() 1420 flags = mGroupFlags; 1421 1422 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1423 invalidate(); 1424 } 1425 1426 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1427 mLayoutAnimationController.isDone() && !more) { 1428 // We want to erase the drawing cache and notify the listener after the 1429 // next frame is drawn because one extra invalidate() is caused by 1430 // drawChild() after the animation is over 1431 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1432 final Runnable end = new Runnable() { 1433 public void run() { 1434 notifyAnimationListener(); 1435 } 1436 }; 1437 post(end); 1438 } 1439 } 1440 1441 /** 1442 * Returns the index of the child to draw for this iteration. Override this 1443 * if you want to change the drawing order of children. By default, it 1444 * returns i. 1445 * <p> 1446 * NOTE: In order for this method to be called, you must enable child ordering 1447 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1448 * 1449 * @param i The current iteration. 1450 * @return The index of the child to draw this iteration. 1451 * 1452 * @see #setChildrenDrawingOrderEnabled(boolean) 1453 * @see #isChildrenDrawingOrderEnabled() 1454 */ 1455 protected int getChildDrawingOrder(int childCount, int i) { 1456 return i; 1457 } 1458 1459 private void notifyAnimationListener() { 1460 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1461 mGroupFlags |= FLAG_ANIMATION_DONE; 1462 1463 if (mAnimationListener != null) { 1464 final Runnable end = new Runnable() { 1465 public void run() { 1466 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1467 } 1468 }; 1469 post(end); 1470 } 1471 1472 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1473 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1474 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1475 setChildrenDrawingCacheEnabled(false); 1476 } 1477 } 1478 1479 invalidate(); 1480 } 1481 1482 /** 1483 * Draw one child of this View Group. This method is responsible for getting 1484 * the canvas in the right state. This includes clipping, translating so 1485 * that the child's scrolled origin is at 0, 0, and applying any animation 1486 * transformations. 1487 * 1488 * @param canvas The canvas on which to draw the child 1489 * @param child Who to draw 1490 * @param drawingTime The time at which draw is occuring 1491 * @return True if an invalidate() was issued 1492 */ 1493 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1494 boolean more = false; 1495 1496 final int cl = child.mLeft; 1497 final int ct = child.mTop; 1498 final int cr = child.mRight; 1499 final int cb = child.mBottom; 1500 1501 final int flags = mGroupFlags; 1502 1503 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1504 mChildTransformation.clear(); 1505 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1506 } 1507 1508 Transformation transformToApply = null; 1509 Transformation invalidationTransform; 1510 final Animation a = child.getAnimation(); 1511 boolean concatMatrix = false; 1512 1513 boolean scalingRequired = false; 1514 boolean caching = false; 1515 if (!canvas.isHardwareAccelerated() && 1516 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1517 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1518 caching = true; 1519 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1520 } 1521 1522 if (a != null) { 1523 final boolean initialized = a.isInitialized(); 1524 if (!initialized) { 1525 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1526 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1527 child.onAnimationStart(); 1528 } 1529 1530 more = a.getTransformation(drawingTime, mChildTransformation, 1531 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1532 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1533 if (mInvalidationTransformation == null) { 1534 mInvalidationTransformation = new Transformation(); 1535 } 1536 invalidationTransform = mInvalidationTransformation; 1537 a.getTransformation(drawingTime, invalidationTransform, 1f); 1538 } else { 1539 invalidationTransform = mChildTransformation; 1540 } 1541 transformToApply = mChildTransformation; 1542 1543 concatMatrix = a.willChangeTransformationMatrix(); 1544 1545 if (more) { 1546 if (!a.willChangeBounds()) { 1547 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1548 FLAG_OPTIMIZE_INVALIDATE) { 1549 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1550 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1551 // The child need to draw an animation, potentially offscreen, so 1552 // make sure we do not cancel invalidate requests 1553 mPrivateFlags |= DRAW_ANIMATION; 1554 invalidate(cl, ct, cr, cb); 1555 } 1556 } else { 1557 if (mInvalidateRegion == null) { 1558 mInvalidateRegion = new RectF(); 1559 } 1560 final RectF region = mInvalidateRegion; 1561 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1562 1563 // The child need to draw an animation, potentially offscreen, so 1564 // make sure we do not cancel invalidate requests 1565 mPrivateFlags |= DRAW_ANIMATION; 1566 1567 final int left = cl + (int) region.left; 1568 final int top = ct + (int) region.top; 1569 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1570 } 1571 } 1572 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1573 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1574 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1575 if (hasTransform) { 1576 final int transformType = mChildTransformation.getTransformationType(); 1577 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1578 mChildTransformation : null; 1579 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1580 } 1581 } 1582 1583 concatMatrix |= !child.hasIdentityMatrix(); 1584 1585 // Sets the flag as early as possible to allow draw() implementations 1586 // to call invalidate() successfully when doing animations 1587 child.mPrivateFlags |= DRAWN; 1588 1589 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1590 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1591 return more; 1592 } 1593 1594 child.computeScroll(); 1595 1596 final int sx = child.mScrollX; 1597 final int sy = child.mScrollY; 1598 1599 Bitmap cache = null; 1600 if (caching) { 1601 cache = child.getDrawingCache(true); 1602 } 1603 1604 final boolean hasNoCache = cache == null; 1605 1606 final int restoreTo = canvas.save(); 1607 if (hasNoCache) { 1608 canvas.translate(cl - sx, ct - sy); 1609 } else { 1610 canvas.translate(cl, ct); 1611 if (scalingRequired) { 1612 // mAttachInfo cannot be null, otherwise scalingRequired == false 1613 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1614 canvas.scale(scale, scale); 1615 } 1616 } 1617 1618 float alpha = child.getAlpha(); 1619 1620 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1621 int transX = 0; 1622 int transY = 0; 1623 1624 if (hasNoCache) { 1625 transX = -sx; 1626 transY = -sy; 1627 } 1628 1629 if (transformToApply != null) { 1630 if (concatMatrix) { 1631 // Undo the scroll translation, apply the transformation matrix, 1632 // then redo the scroll translate to get the correct result. 1633 canvas.translate(-transX, -transY); 1634 canvas.concat(transformToApply.getMatrix()); 1635 canvas.translate(transX, transY); 1636 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1637 } 1638 1639 float transformAlpha = transformToApply.getAlpha(); 1640 if (transformAlpha < 1.0f) { 1641 alpha *= transformToApply.getAlpha(); 1642 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1643 } 1644 } 1645 1646 if (!child.hasIdentityMatrix()) { 1647 canvas.translate(-transX, -transY); 1648 canvas.concat(child.getMatrix()); 1649 canvas.translate(transX, transY); 1650 } 1651 1652 if (alpha < 1.0f) { 1653 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1654 1655 if (hasNoCache) { 1656 final int multipliedAlpha = (int) (255 * alpha); 1657 if (!child.onSetAlpha(multipliedAlpha)) { 1658 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1659 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1660 } else { 1661 child.mPrivateFlags |= ALPHA_SET; 1662 } 1663 } 1664 } 1665 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1666 child.onSetAlpha(255); 1667 } 1668 1669 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1670 if (hasNoCache) { 1671 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1672 } else { 1673 if (!scalingRequired) { 1674 canvas.clipRect(0, 0, cr - cl, cb - ct); 1675 } else { 1676 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 1677 } 1678 } 1679 } 1680 1681 if (hasNoCache) { 1682 // Fast path for layouts with no backgrounds 1683 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 1684 if (ViewDebug.TRACE_HIERARCHY) { 1685 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 1686 } 1687 child.mPrivateFlags &= ~DIRTY_MASK; 1688 child.dispatchDraw(canvas); 1689 } else { 1690 child.draw(canvas); 1691 } 1692 } else { 1693 final Paint cachePaint = mCachePaint; 1694 if (alpha < 1.0f) { 1695 cachePaint.setAlpha((int) (alpha * 255)); 1696 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 1697 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 1698 cachePaint.setAlpha(255); 1699 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 1700 } 1701 if (Config.DEBUG && ViewDebug.profileDrawing) { 1702 EventLog.writeEvent(60003, hashCode()); 1703 } 1704 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 1705 } 1706 1707 canvas.restoreToCount(restoreTo); 1708 1709 if (a != null && !more) { 1710 child.onSetAlpha(255); 1711 finishAnimatingView(child, a); 1712 } 1713 1714 return more; 1715 } 1716 1717 /** 1718 * By default, children are clipped to their bounds before drawing. This 1719 * allows view groups to override this behavior for animations, etc. 1720 * 1721 * @param clipChildren true to clip children to their bounds, 1722 * false otherwise 1723 * @attr ref android.R.styleable#ViewGroup_clipChildren 1724 */ 1725 public void setClipChildren(boolean clipChildren) { 1726 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 1727 } 1728 1729 /** 1730 * By default, children are clipped to the padding of the ViewGroup. This 1731 * allows view groups to override this behavior 1732 * 1733 * @param clipToPadding true to clip children to the padding of the 1734 * group, false otherwise 1735 * @attr ref android.R.styleable#ViewGroup_clipToPadding 1736 */ 1737 public void setClipToPadding(boolean clipToPadding) { 1738 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 1739 } 1740 1741 /** 1742 * {@inheritDoc} 1743 */ 1744 @Override 1745 public void dispatchSetSelected(boolean selected) { 1746 final View[] children = mChildren; 1747 final int count = mChildrenCount; 1748 for (int i = 0; i < count; i++) { 1749 1750 children[i].setSelected(selected); 1751 } 1752 } 1753 1754 @Override 1755 protected void dispatchSetPressed(boolean pressed) { 1756 final View[] children = mChildren; 1757 final int count = mChildrenCount; 1758 for (int i = 0; i < count; i++) { 1759 children[i].setPressed(pressed); 1760 } 1761 } 1762 1763 /** 1764 * When this property is set to true, this ViewGroup supports static transformations on 1765 * children; this causes 1766 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 1767 * invoked when a child is drawn. 1768 * 1769 * Any subclass overriding 1770 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 1771 * set this property to true. 1772 * 1773 * @param enabled True to enable static transformations on children, false otherwise. 1774 * 1775 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 1776 */ 1777 protected void setStaticTransformationsEnabled(boolean enabled) { 1778 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 1779 } 1780 1781 /** 1782 * {@inheritDoc} 1783 * 1784 * @see #setStaticTransformationsEnabled(boolean) 1785 */ 1786 protected boolean getChildStaticTransformation(View child, Transformation t) { 1787 return false; 1788 } 1789 1790 /** 1791 * {@hide} 1792 */ 1793 @Override 1794 protected View findViewTraversal(int id) { 1795 if (id == mID) { 1796 return this; 1797 } 1798 1799 final View[] where = mChildren; 1800 final int len = mChildrenCount; 1801 1802 for (int i = 0; i < len; i++) { 1803 View v = where[i]; 1804 1805 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1806 v = v.findViewById(id); 1807 1808 if (v != null) { 1809 return v; 1810 } 1811 } 1812 } 1813 1814 return null; 1815 } 1816 1817 /** 1818 * {@hide} 1819 */ 1820 @Override 1821 protected View findViewWithTagTraversal(Object tag) { 1822 if (tag != null && tag.equals(mTag)) { 1823 return this; 1824 } 1825 1826 final View[] where = mChildren; 1827 final int len = mChildrenCount; 1828 1829 for (int i = 0; i < len; i++) { 1830 View v = where[i]; 1831 1832 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1833 v = v.findViewWithTag(tag); 1834 1835 if (v != null) { 1836 return v; 1837 } 1838 } 1839 } 1840 1841 return null; 1842 } 1843 1844 /** 1845 * Adds a child view. If no layout parameters are already set on the child, the 1846 * default parameters for this ViewGroup are set on the child. 1847 * 1848 * @param child the child view to add 1849 * 1850 * @see #generateDefaultLayoutParams() 1851 */ 1852 public void addView(View child) { 1853 addView(child, -1); 1854 } 1855 1856 /** 1857 * Adds a child view. If no layout parameters are already set on the child, the 1858 * default parameters for this ViewGroup are set on the child. 1859 * 1860 * @param child the child view to add 1861 * @param index the position at which to add the child 1862 * 1863 * @see #generateDefaultLayoutParams() 1864 */ 1865 public void addView(View child, int index) { 1866 LayoutParams params = child.getLayoutParams(); 1867 if (params == null) { 1868 params = generateDefaultLayoutParams(); 1869 if (params == null) { 1870 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 1871 } 1872 } 1873 addView(child, index, params); 1874 } 1875 1876 /** 1877 * Adds a child view with this ViewGroup's default layout parameters and the 1878 * specified width and height. 1879 * 1880 * @param child the child view to add 1881 */ 1882 public void addView(View child, int width, int height) { 1883 final LayoutParams params = generateDefaultLayoutParams(); 1884 params.width = width; 1885 params.height = height; 1886 addView(child, -1, params); 1887 } 1888 1889 /** 1890 * Adds a child view with the specified layout parameters. 1891 * 1892 * @param child the child view to add 1893 * @param params the layout parameters to set on the child 1894 */ 1895 public void addView(View child, LayoutParams params) { 1896 addView(child, -1, params); 1897 } 1898 1899 /** 1900 * Adds a child view with the specified layout parameters. 1901 * 1902 * @param child the child view to add 1903 * @param index the position at which to add the child 1904 * @param params the layout parameters to set on the child 1905 */ 1906 public void addView(View child, int index, LayoutParams params) { 1907 if (DBG) { 1908 System.out.println(this + " addView"); 1909 } 1910 1911 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 1912 // therefore, we call requestLayout() on ourselves before, so that the child's request 1913 // will be blocked at our level 1914 requestLayout(); 1915 invalidate(); 1916 addViewInner(child, index, params, false); 1917 } 1918 1919 /** 1920 * {@inheritDoc} 1921 */ 1922 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 1923 if (!checkLayoutParams(params)) { 1924 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 1925 } 1926 if (view.mParent != this) { 1927 throw new IllegalArgumentException("Given view not a child of " + this); 1928 } 1929 view.setLayoutParams(params); 1930 } 1931 1932 /** 1933 * {@inheritDoc} 1934 */ 1935 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 1936 return p != null; 1937 } 1938 1939 /** 1940 * Interface definition for a callback to be invoked when the hierarchy 1941 * within this view changed. The hierarchy changes whenever a child is added 1942 * to or removed from this view. 1943 */ 1944 public interface OnHierarchyChangeListener { 1945 /** 1946 * Called when a new child is added to a parent view. 1947 * 1948 * @param parent the view in which a child was added 1949 * @param child the new child view added in the hierarchy 1950 */ 1951 void onChildViewAdded(View parent, View child); 1952 1953 /** 1954 * Called when a child is removed from a parent view. 1955 * 1956 * @param parent the view from which the child was removed 1957 * @param child the child removed from the hierarchy 1958 */ 1959 void onChildViewRemoved(View parent, View child); 1960 } 1961 1962 /** 1963 * Register a callback to be invoked when a child is added to or removed 1964 * from this view. 1965 * 1966 * @param listener the callback to invoke on hierarchy change 1967 */ 1968 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 1969 mOnHierarchyChangeListener = listener; 1970 } 1971 1972 /** 1973 * Adds a view during layout. This is useful if in your onLayout() method, 1974 * you need to add more views (as does the list view for example). 1975 * 1976 * If index is negative, it means put it at the end of the list. 1977 * 1978 * @param child the view to add to the group 1979 * @param index the index at which the child must be added 1980 * @param params the layout parameters to associate with the child 1981 * @return true if the child was added, false otherwise 1982 */ 1983 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 1984 return addViewInLayout(child, index, params, false); 1985 } 1986 1987 /** 1988 * Adds a view during layout. This is useful if in your onLayout() method, 1989 * you need to add more views (as does the list view for example). 1990 * 1991 * If index is negative, it means put it at the end of the list. 1992 * 1993 * @param child the view to add to the group 1994 * @param index the index at which the child must be added 1995 * @param params the layout parameters to associate with the child 1996 * @param preventRequestLayout if true, calling this method will not trigger a 1997 * layout request on child 1998 * @return true if the child was added, false otherwise 1999 */ 2000 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2001 boolean preventRequestLayout) { 2002 child.mParent = null; 2003 addViewInner(child, index, params, preventRequestLayout); 2004 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2005 return true; 2006 } 2007 2008 /** 2009 * Prevents the specified child to be laid out during the next layout pass. 2010 * 2011 * @param child the child on which to perform the cleanup 2012 */ 2013 protected void cleanupLayoutState(View child) { 2014 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2015 } 2016 2017 private void addViewInner(View child, int index, LayoutParams params, 2018 boolean preventRequestLayout) { 2019 2020 if (child.getParent() != null) { 2021 throw new IllegalStateException("The specified child already has a parent. " + 2022 "You must call removeView() on the child's parent first."); 2023 } 2024 2025 if (!checkLayoutParams(params)) { 2026 params = generateLayoutParams(params); 2027 } 2028 2029 if (preventRequestLayout) { 2030 child.mLayoutParams = params; 2031 } else { 2032 child.setLayoutParams(params); 2033 } 2034 2035 if (index < 0) { 2036 index = mChildrenCount; 2037 } 2038 2039 addInArray(child, index); 2040 2041 // tell our children 2042 if (preventRequestLayout) { 2043 child.assignParent(this); 2044 } else { 2045 child.mParent = this; 2046 } 2047 2048 if (child.hasFocus()) { 2049 requestChildFocus(child, child.findFocus()); 2050 } 2051 2052 AttachInfo ai = mAttachInfo; 2053 if (ai != null) { 2054 boolean lastKeepOn = ai.mKeepScreenOn; 2055 ai.mKeepScreenOn = false; 2056 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2057 if (ai.mKeepScreenOn) { 2058 needGlobalAttributesUpdate(true); 2059 } 2060 ai.mKeepScreenOn = lastKeepOn; 2061 } 2062 2063 if (mOnHierarchyChangeListener != null) { 2064 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2065 } 2066 2067 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2068 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2069 } 2070 } 2071 2072 private void addInArray(View child, int index) { 2073 View[] children = mChildren; 2074 final int count = mChildrenCount; 2075 final int size = children.length; 2076 if (index == count) { 2077 if (size == count) { 2078 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2079 System.arraycopy(children, 0, mChildren, 0, size); 2080 children = mChildren; 2081 } 2082 children[mChildrenCount++] = child; 2083 } else if (index < count) { 2084 if (size == count) { 2085 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2086 System.arraycopy(children, 0, mChildren, 0, index); 2087 System.arraycopy(children, index, mChildren, index + 1, count - index); 2088 children = mChildren; 2089 } else { 2090 System.arraycopy(children, index, children, index + 1, count - index); 2091 } 2092 children[index] = child; 2093 mChildrenCount++; 2094 } else { 2095 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2096 } 2097 } 2098 2099 // This method also sets the child's mParent to null 2100 private void removeFromArray(int index) { 2101 final View[] children = mChildren; 2102 children[index].mParent = null; 2103 final int count = mChildrenCount; 2104 if (index == count - 1) { 2105 children[--mChildrenCount] = null; 2106 } else if (index >= 0 && index < count) { 2107 System.arraycopy(children, index + 1, children, index, count - index - 1); 2108 children[--mChildrenCount] = null; 2109 } else { 2110 throw new IndexOutOfBoundsException(); 2111 } 2112 } 2113 2114 // This method also sets the children's mParent to null 2115 private void removeFromArray(int start, int count) { 2116 final View[] children = mChildren; 2117 final int childrenCount = mChildrenCount; 2118 2119 start = Math.max(0, start); 2120 final int end = Math.min(childrenCount, start + count); 2121 2122 if (start == end) { 2123 return; 2124 } 2125 2126 if (end == childrenCount) { 2127 for (int i = start; i < end; i++) { 2128 children[i].mParent = null; 2129 children[i] = null; 2130 } 2131 } else { 2132 for (int i = start; i < end; i++) { 2133 children[i].mParent = null; 2134 } 2135 2136 // Since we're looping above, we might as well do the copy, but is arraycopy() 2137 // faster than the extra 2 bounds checks we would do in the loop? 2138 System.arraycopy(children, end, children, start, childrenCount - end); 2139 2140 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2141 children[i] = null; 2142 } 2143 } 2144 2145 mChildrenCount -= (end - start); 2146 } 2147 2148 private void bindLayoutAnimation(View child) { 2149 Animation a = mLayoutAnimationController.getAnimationForView(child); 2150 child.setAnimation(a); 2151 } 2152 2153 /** 2154 * Subclasses should override this method to set layout animation 2155 * parameters on the supplied child. 2156 * 2157 * @param child the child to associate with animation parameters 2158 * @param params the child's layout parameters which hold the animation 2159 * parameters 2160 * @param index the index of the child in the view group 2161 * @param count the number of children in the view group 2162 */ 2163 protected void attachLayoutAnimationParameters(View child, 2164 LayoutParams params, int index, int count) { 2165 LayoutAnimationController.AnimationParameters animationParams = 2166 params.layoutAnimationParameters; 2167 if (animationParams == null) { 2168 animationParams = new LayoutAnimationController.AnimationParameters(); 2169 params.layoutAnimationParameters = animationParams; 2170 } 2171 2172 animationParams.count = count; 2173 animationParams.index = index; 2174 } 2175 2176 /** 2177 * {@inheritDoc} 2178 */ 2179 public void removeView(View view) { 2180 removeViewInternal(view); 2181 requestLayout(); 2182 invalidate(); 2183 } 2184 2185 /** 2186 * Removes a view during layout. This is useful if in your onLayout() method, 2187 * you need to remove more views. 2188 * 2189 * @param view the view to remove from the group 2190 */ 2191 public void removeViewInLayout(View view) { 2192 removeViewInternal(view); 2193 } 2194 2195 /** 2196 * Removes a range of views during layout. This is useful if in your onLayout() method, 2197 * you need to remove more views. 2198 * 2199 * @param start the index of the first view to remove from the group 2200 * @param count the number of views to remove from the group 2201 */ 2202 public void removeViewsInLayout(int start, int count) { 2203 removeViewsInternal(start, count); 2204 } 2205 2206 /** 2207 * Removes the view at the specified position in the group. 2208 * 2209 * @param index the position in the group of the view to remove 2210 */ 2211 public void removeViewAt(int index) { 2212 removeViewInternal(index, getChildAt(index)); 2213 requestLayout(); 2214 invalidate(); 2215 } 2216 2217 /** 2218 * Removes the specified range of views from the group. 2219 * 2220 * @param start the first position in the group of the range of views to remove 2221 * @param count the number of views to remove 2222 */ 2223 public void removeViews(int start, int count) { 2224 removeViewsInternal(start, count); 2225 requestLayout(); 2226 invalidate(); 2227 } 2228 2229 private void removeViewInternal(View view) { 2230 final int index = indexOfChild(view); 2231 if (index >= 0) { 2232 removeViewInternal(index, view); 2233 } 2234 } 2235 2236 private void removeViewInternal(int index, View view) { 2237 boolean clearChildFocus = false; 2238 if (view == mFocused) { 2239 view.clearFocusForRemoval(); 2240 clearChildFocus = true; 2241 } 2242 2243 if (view.getAnimation() != null) { 2244 addDisappearingView(view); 2245 } else if (view.mAttachInfo != null) { 2246 view.dispatchDetachedFromWindow(); 2247 } 2248 2249 if (mOnHierarchyChangeListener != null) { 2250 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2251 } 2252 2253 needGlobalAttributesUpdate(false); 2254 2255 removeFromArray(index); 2256 2257 if (clearChildFocus) { 2258 clearChildFocus(view); 2259 } 2260 } 2261 2262 private void removeViewsInternal(int start, int count) { 2263 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2264 final boolean notifyListener = onHierarchyChangeListener != null; 2265 final View focused = mFocused; 2266 final boolean detach = mAttachInfo != null; 2267 View clearChildFocus = null; 2268 2269 final View[] children = mChildren; 2270 final int end = start + count; 2271 2272 for (int i = start; i < end; i++) { 2273 final View view = children[i]; 2274 2275 if (view == focused) { 2276 view.clearFocusForRemoval(); 2277 clearChildFocus = view; 2278 } 2279 2280 if (view.getAnimation() != null) { 2281 addDisappearingView(view); 2282 } else if (detach) { 2283 view.dispatchDetachedFromWindow(); 2284 } 2285 2286 needGlobalAttributesUpdate(false); 2287 2288 if (notifyListener) { 2289 onHierarchyChangeListener.onChildViewRemoved(this, view); 2290 } 2291 } 2292 2293 removeFromArray(start, count); 2294 2295 if (clearChildFocus != null) { 2296 clearChildFocus(clearChildFocus); 2297 } 2298 } 2299 2300 /** 2301 * Call this method to remove all child views from the 2302 * ViewGroup. 2303 */ 2304 public void removeAllViews() { 2305 removeAllViewsInLayout(); 2306 requestLayout(); 2307 invalidate(); 2308 } 2309 2310 /** 2311 * Called by a ViewGroup subclass to remove child views from itself, 2312 * when it must first know its size on screen before it can calculate how many 2313 * child views it will render. An example is a Gallery or a ListView, which 2314 * may "have" 50 children, but actually only render the number of children 2315 * that can currently fit inside the object on screen. Do not call 2316 * this method unless you are extending ViewGroup and understand the 2317 * view measuring and layout pipeline. 2318 */ 2319 public void removeAllViewsInLayout() { 2320 final int count = mChildrenCount; 2321 if (count <= 0) { 2322 return; 2323 } 2324 2325 final View[] children = mChildren; 2326 mChildrenCount = 0; 2327 2328 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2329 final boolean notify = listener != null; 2330 final View focused = mFocused; 2331 final boolean detach = mAttachInfo != null; 2332 View clearChildFocus = null; 2333 2334 needGlobalAttributesUpdate(false); 2335 2336 for (int i = count - 1; i >= 0; i--) { 2337 final View view = children[i]; 2338 2339 if (view == focused) { 2340 view.clearFocusForRemoval(); 2341 clearChildFocus = view; 2342 } 2343 2344 if (view.getAnimation() != null) { 2345 addDisappearingView(view); 2346 } else if (detach) { 2347 view.dispatchDetachedFromWindow(); 2348 } 2349 2350 if (notify) { 2351 listener.onChildViewRemoved(this, view); 2352 } 2353 2354 view.mParent = null; 2355 children[i] = null; 2356 } 2357 2358 if (clearChildFocus != null) { 2359 clearChildFocus(clearChildFocus); 2360 } 2361 } 2362 2363 /** 2364 * Finishes the removal of a detached view. This method will dispatch the detached from 2365 * window event and notify the hierarchy change listener. 2366 * 2367 * @param child the child to be definitely removed from the view hierarchy 2368 * @param animate if true and the view has an animation, the view is placed in the 2369 * disappearing views list, otherwise, it is detached from the window 2370 * 2371 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2372 * @see #detachAllViewsFromParent() 2373 * @see #detachViewFromParent(View) 2374 * @see #detachViewFromParent(int) 2375 */ 2376 protected void removeDetachedView(View child, boolean animate) { 2377 if (child == mFocused) { 2378 child.clearFocus(); 2379 } 2380 2381 if (animate && child.getAnimation() != null) { 2382 addDisappearingView(child); 2383 } else if (child.mAttachInfo != null) { 2384 child.dispatchDetachedFromWindow(); 2385 } 2386 2387 if (mOnHierarchyChangeListener != null) { 2388 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2389 } 2390 } 2391 2392 /** 2393 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2394 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2395 * by calling {@link #getChildAt(int)}. 2396 * 2397 * This method should be called only for view which were detached from their parent. 2398 * 2399 * @param child the child to attach 2400 * @param index the index at which the child should be attached 2401 * @param params the layout parameters of the child 2402 * 2403 * @see #removeDetachedView(View, boolean) 2404 * @see #detachAllViewsFromParent() 2405 * @see #detachViewFromParent(View) 2406 * @see #detachViewFromParent(int) 2407 */ 2408 protected void attachViewToParent(View child, int index, LayoutParams params) { 2409 child.mLayoutParams = params; 2410 2411 if (index < 0) { 2412 index = mChildrenCount; 2413 } 2414 2415 addInArray(child, index); 2416 2417 child.mParent = this; 2418 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2419 2420 if (child.hasFocus()) { 2421 requestChildFocus(child, child.findFocus()); 2422 } 2423 } 2424 2425 /** 2426 * Detaches a view from its parent. Detaching a view should be temporary and followed 2427 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2428 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2429 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2430 * 2431 * @param child the child to detach 2432 * 2433 * @see #detachViewFromParent(int) 2434 * @see #detachViewsFromParent(int, int) 2435 * @see #detachAllViewsFromParent() 2436 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2437 * @see #removeDetachedView(View, boolean) 2438 */ 2439 protected void detachViewFromParent(View child) { 2440 removeFromArray(indexOfChild(child)); 2441 } 2442 2443 /** 2444 * Detaches a view from its parent. Detaching a view should be temporary and followed 2445 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2446 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2447 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2448 * 2449 * @param index the index of the child to detach 2450 * 2451 * @see #detachViewFromParent(View) 2452 * @see #detachAllViewsFromParent() 2453 * @see #detachViewsFromParent(int, int) 2454 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2455 * @see #removeDetachedView(View, boolean) 2456 */ 2457 protected void detachViewFromParent(int index) { 2458 removeFromArray(index); 2459 } 2460 2461 /** 2462 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2463 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2464 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2465 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2466 * 2467 * @param start the first index of the childrend range to detach 2468 * @param count the number of children to detach 2469 * 2470 * @see #detachViewFromParent(View) 2471 * @see #detachViewFromParent(int) 2472 * @see #detachAllViewsFromParent() 2473 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2474 * @see #removeDetachedView(View, boolean) 2475 */ 2476 protected void detachViewsFromParent(int start, int count) { 2477 removeFromArray(start, count); 2478 } 2479 2480 /** 2481 * Detaches all views from the parent. Detaching a view should be temporary and followed 2482 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2483 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2484 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2485 * 2486 * @see #detachViewFromParent(View) 2487 * @see #detachViewFromParent(int) 2488 * @see #detachViewsFromParent(int, int) 2489 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2490 * @see #removeDetachedView(View, boolean) 2491 */ 2492 protected void detachAllViewsFromParent() { 2493 final int count = mChildrenCount; 2494 if (count <= 0) { 2495 return; 2496 } 2497 2498 final View[] children = mChildren; 2499 mChildrenCount = 0; 2500 2501 for (int i = count - 1; i >= 0; i--) { 2502 children[i].mParent = null; 2503 children[i] = null; 2504 } 2505 } 2506 2507 /** 2508 * Don't call or override this method. It is used for the implementation of 2509 * the view hierarchy. 2510 */ 2511 public final void invalidateChild(View child, final Rect dirty) { 2512 if (ViewDebug.TRACE_HIERARCHY) { 2513 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2514 } 2515 2516 ViewParent parent = this; 2517 2518 final AttachInfo attachInfo = mAttachInfo; 2519 if (attachInfo != null) { 2520 final int[] location = attachInfo.mInvalidateChildLocation; 2521 location[CHILD_LEFT_INDEX] = child.mLeft; 2522 location[CHILD_TOP_INDEX] = child.mTop; 2523 Matrix childMatrix = child.getMatrix(); 2524 if (!childMatrix.isIdentity()) { 2525 RectF boundingRect = attachInfo.mTmpTransformRect; 2526 boundingRect.set(dirty); 2527 childMatrix.mapRect(boundingRect); 2528 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2529 (int) (boundingRect.right + 0.5f), 2530 (int) (boundingRect.bottom + 0.5f)); 2531 } 2532 2533 // If the child is drawing an animation, we want to copy this flag onto 2534 // ourselves and the parent to make sure the invalidate request goes 2535 // through 2536 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2537 2538 // Check whether the child that requests the invalidate is fully opaque 2539 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2540 child.getAnimation() != null; 2541 // Mark the child as dirty, using the appropriate flag 2542 // Make sure we do not set both flags at the same time 2543 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2544 2545 do { 2546 View view = null; 2547 if (parent instanceof View) { 2548 view = (View) parent; 2549 } 2550 2551 if (drawAnimation) { 2552 if (view != null) { 2553 view.mPrivateFlags |= DRAW_ANIMATION; 2554 } else if (parent instanceof ViewRoot) { 2555 ((ViewRoot) parent).mIsAnimating = true; 2556 } 2557 } 2558 2559 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2560 // flag coming from the child that initiated the invalidate 2561 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2562 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2563 } 2564 2565 parent = parent.invalidateChildInParent(location, dirty); 2566 if (view != null) { 2567 // Account for transform on current parent 2568 Matrix m = view.getMatrix(); 2569 if (!m.isIdentity()) { 2570 RectF boundingRect = attachInfo.mTmpTransformRect; 2571 boundingRect.set(dirty); 2572 m.mapRect(boundingRect); 2573 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2574 (int) (boundingRect.right + 0.5f), 2575 (int) (boundingRect.bottom + 0.5f)); 2576 } 2577 } 2578 } while (parent != null); 2579 } 2580 } 2581 2582 /** 2583 * Don't call or override this method. It is used for the implementation of 2584 * the view hierarchy. 2585 * 2586 * This implementation returns null if this ViewGroup does not have a parent, 2587 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2588 * does not intersect with this ViewGroup's bounds. 2589 */ 2590 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2591 if (ViewDebug.TRACE_HIERARCHY) { 2592 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2593 } 2594 2595 if ((mPrivateFlags & DRAWN) == DRAWN) { 2596 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2597 FLAG_OPTIMIZE_INVALIDATE) { 2598 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2599 location[CHILD_TOP_INDEX] - mScrollY); 2600 2601 final int left = mLeft; 2602 final int top = mTop; 2603 2604 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2605 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2606 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2607 2608 location[CHILD_LEFT_INDEX] = left; 2609 location[CHILD_TOP_INDEX] = top; 2610 2611 return mParent; 2612 } 2613 } else { 2614 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2615 2616 location[CHILD_LEFT_INDEX] = mLeft; 2617 location[CHILD_TOP_INDEX] = mTop; 2618 2619 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2620 mBottom - location[CHILD_TOP_INDEX]); 2621 2622 return mParent; 2623 } 2624 } 2625 2626 return null; 2627 } 2628 2629 /** 2630 * Offset a rectangle that is in a descendant's coordinate 2631 * space into our coordinate space. 2632 * @param descendant A descendant of this view 2633 * @param rect A rectangle defined in descendant's coordinate space. 2634 */ 2635 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 2636 offsetRectBetweenParentAndChild(descendant, rect, true, false); 2637 } 2638 2639 /** 2640 * Offset a rectangle that is in our coordinate space into an ancestor's 2641 * coordinate space. 2642 * @param descendant A descendant of this view 2643 * @param rect A rectangle defined in descendant's coordinate space. 2644 */ 2645 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 2646 offsetRectBetweenParentAndChild(descendant, rect, false, false); 2647 } 2648 2649 /** 2650 * Helper method that offsets a rect either from parent to descendant or 2651 * descendant to parent. 2652 */ 2653 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 2654 boolean offsetFromChildToParent, boolean clipToBounds) { 2655 2656 // already in the same coord system :) 2657 if (descendant == this) { 2658 return; 2659 } 2660 2661 ViewParent theParent = descendant.mParent; 2662 2663 // search and offset up to the parent 2664 while ((theParent != null) 2665 && (theParent instanceof View) 2666 && (theParent != this)) { 2667 2668 if (offsetFromChildToParent) { 2669 rect.offset(descendant.mLeft - descendant.mScrollX, 2670 descendant.mTop - descendant.mScrollY); 2671 if (clipToBounds) { 2672 View p = (View) theParent; 2673 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2674 } 2675 } else { 2676 if (clipToBounds) { 2677 View p = (View) theParent; 2678 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2679 } 2680 rect.offset(descendant.mScrollX - descendant.mLeft, 2681 descendant.mScrollY - descendant.mTop); 2682 } 2683 2684 descendant = (View) theParent; 2685 theParent = descendant.mParent; 2686 } 2687 2688 // now that we are up to this view, need to offset one more time 2689 // to get into our coordinate space 2690 if (theParent == this) { 2691 if (offsetFromChildToParent) { 2692 rect.offset(descendant.mLeft - descendant.mScrollX, 2693 descendant.mTop - descendant.mScrollY); 2694 } else { 2695 rect.offset(descendant.mScrollX - descendant.mLeft, 2696 descendant.mScrollY - descendant.mTop); 2697 } 2698 } else { 2699 throw new IllegalArgumentException("parameter must be a descendant of this view"); 2700 } 2701 } 2702 2703 /** 2704 * Offset the vertical location of all children of this view by the specified number of pixels. 2705 * 2706 * @param offset the number of pixels to offset 2707 * 2708 * @hide 2709 */ 2710 public void offsetChildrenTopAndBottom(int offset) { 2711 final int count = mChildrenCount; 2712 final View[] children = mChildren; 2713 2714 for (int i = 0; i < count; i++) { 2715 final View v = children[i]; 2716 v.mTop += offset; 2717 v.mBottom += offset; 2718 } 2719 } 2720 2721 /** 2722 * {@inheritDoc} 2723 */ 2724 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 2725 int dx = child.mLeft - mScrollX; 2726 int dy = child.mTop - mScrollY; 2727 if (offset != null) { 2728 offset.x += dx; 2729 offset.y += dy; 2730 } 2731 r.offset(dx, dy); 2732 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 2733 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 2734 } 2735 2736 /** 2737 * {@inheritDoc} 2738 */ 2739 @Override 2740 protected abstract void onLayout(boolean changed, 2741 int l, int t, int r, int b); 2742 2743 /** 2744 * Indicates whether the view group has the ability to animate its children 2745 * after the first layout. 2746 * 2747 * @return true if the children can be animated, false otherwise 2748 */ 2749 protected boolean canAnimate() { 2750 return mLayoutAnimationController != null; 2751 } 2752 2753 /** 2754 * Runs the layout animation. Calling this method triggers a relayout of 2755 * this view group. 2756 */ 2757 public void startLayoutAnimation() { 2758 if (mLayoutAnimationController != null) { 2759 mGroupFlags |= FLAG_RUN_ANIMATION; 2760 requestLayout(); 2761 } 2762 } 2763 2764 /** 2765 * Schedules the layout animation to be played after the next layout pass 2766 * of this view group. This can be used to restart the layout animation 2767 * when the content of the view group changes or when the activity is 2768 * paused and resumed. 2769 */ 2770 public void scheduleLayoutAnimation() { 2771 mGroupFlags |= FLAG_RUN_ANIMATION; 2772 } 2773 2774 /** 2775 * Sets the layout animation controller used to animate the group's 2776 * children after the first layout. 2777 * 2778 * @param controller the animation controller 2779 */ 2780 public void setLayoutAnimation(LayoutAnimationController controller) { 2781 mLayoutAnimationController = controller; 2782 if (mLayoutAnimationController != null) { 2783 mGroupFlags |= FLAG_RUN_ANIMATION; 2784 } 2785 } 2786 2787 /** 2788 * Returns the layout animation controller used to animate the group's 2789 * children. 2790 * 2791 * @return the current animation controller 2792 */ 2793 public LayoutAnimationController getLayoutAnimation() { 2794 return mLayoutAnimationController; 2795 } 2796 2797 /** 2798 * Indicates whether the children's drawing cache is used during a layout 2799 * animation. By default, the drawing cache is enabled but this will prevent 2800 * nested layout animations from working. To nest animations, you must disable 2801 * the cache. 2802 * 2803 * @return true if the animation cache is enabled, false otherwise 2804 * 2805 * @see #setAnimationCacheEnabled(boolean) 2806 * @see View#setDrawingCacheEnabled(boolean) 2807 */ 2808 @ViewDebug.ExportedProperty 2809 public boolean isAnimationCacheEnabled() { 2810 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2811 } 2812 2813 /** 2814 * Enables or disables the children's drawing cache during a layout animation. 2815 * By default, the drawing cache is enabled but this will prevent nested 2816 * layout animations from working. To nest animations, you must disable the 2817 * cache. 2818 * 2819 * @param enabled true to enable the animation cache, false otherwise 2820 * 2821 * @see #isAnimationCacheEnabled() 2822 * @see View#setDrawingCacheEnabled(boolean) 2823 */ 2824 public void setAnimationCacheEnabled(boolean enabled) { 2825 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 2826 } 2827 2828 /** 2829 * Indicates whether this ViewGroup will always try to draw its children using their 2830 * drawing cache. By default this property is enabled. 2831 * 2832 * @return true if the animation cache is enabled, false otherwise 2833 * 2834 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2835 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2836 * @see View#setDrawingCacheEnabled(boolean) 2837 */ 2838 @ViewDebug.ExportedProperty 2839 public boolean isAlwaysDrawnWithCacheEnabled() { 2840 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 2841 } 2842 2843 /** 2844 * Indicates whether this ViewGroup will always try to draw its children using their 2845 * drawing cache. This property can be set to true when the cache rendering is 2846 * slightly different from the children's normal rendering. Renderings can be different, 2847 * for instance, when the cache's quality is set to low. 2848 * 2849 * When this property is disabled, the ViewGroup will use the drawing cache of its 2850 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 2851 * when to start using the drawing cache and when to stop using it. 2852 * 2853 * @param always true to always draw with the drawing cache, false otherwise 2854 * 2855 * @see #isAlwaysDrawnWithCacheEnabled() 2856 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2857 * @see View#setDrawingCacheEnabled(boolean) 2858 * @see View#setDrawingCacheQuality(int) 2859 */ 2860 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 2861 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 2862 } 2863 2864 /** 2865 * Indicates whether the ViewGroup is currently drawing its children using 2866 * their drawing cache. 2867 * 2868 * @return true if children should be drawn with their cache, false otherwise 2869 * 2870 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2871 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2872 */ 2873 @ViewDebug.ExportedProperty 2874 protected boolean isChildrenDrawnWithCacheEnabled() { 2875 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 2876 } 2877 2878 /** 2879 * Tells the ViewGroup to draw its children using their drawing cache. This property 2880 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 2881 * will be used only if it has been enabled. 2882 * 2883 * Subclasses should call this method to start and stop using the drawing cache when 2884 * they perform performance sensitive operations, like scrolling or animating. 2885 * 2886 * @param enabled true if children should be drawn with their cache, false otherwise 2887 * 2888 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2889 * @see #isChildrenDrawnWithCacheEnabled() 2890 */ 2891 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 2892 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 2893 } 2894 2895 /** 2896 * Indicates whether the ViewGroup is drawing its children in the order defined by 2897 * {@link #getChildDrawingOrder(int, int)}. 2898 * 2899 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 2900 * false otherwise 2901 * 2902 * @see #setChildrenDrawingOrderEnabled(boolean) 2903 * @see #getChildDrawingOrder(int, int) 2904 */ 2905 @ViewDebug.ExportedProperty 2906 protected boolean isChildrenDrawingOrderEnabled() { 2907 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 2908 } 2909 2910 /** 2911 * Tells the ViewGroup whether to draw its children in the order defined by the method 2912 * {@link #getChildDrawingOrder(int, int)}. 2913 * 2914 * @param enabled true if the order of the children when drawing is determined by 2915 * {@link #getChildDrawingOrder(int, int)}, false otherwise 2916 * 2917 * @see #isChildrenDrawingOrderEnabled() 2918 * @see #getChildDrawingOrder(int, int) 2919 */ 2920 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 2921 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 2922 } 2923 2924 private void setBooleanFlag(int flag, boolean value) { 2925 if (value) { 2926 mGroupFlags |= flag; 2927 } else { 2928 mGroupFlags &= ~flag; 2929 } 2930 } 2931 2932 /** 2933 * Returns an integer indicating what types of drawing caches are kept in memory. 2934 * 2935 * @see #setPersistentDrawingCache(int) 2936 * @see #setAnimationCacheEnabled(boolean) 2937 * 2938 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 2939 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2940 * and {@link #PERSISTENT_ALL_CACHES} 2941 */ 2942 @ViewDebug.ExportedProperty(mapping = { 2943 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 2944 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 2945 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 2946 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 2947 }) 2948 public int getPersistentDrawingCache() { 2949 return mPersistentDrawingCache; 2950 } 2951 2952 /** 2953 * Indicates what types of drawing caches should be kept in memory after 2954 * they have been created. 2955 * 2956 * @see #getPersistentDrawingCache() 2957 * @see #setAnimationCacheEnabled(boolean) 2958 * 2959 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 2960 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2961 * and {@link #PERSISTENT_ALL_CACHES} 2962 */ 2963 public void setPersistentDrawingCache(int drawingCacheToKeep) { 2964 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 2965 } 2966 2967 /** 2968 * Returns a new set of layout parameters based on the supplied attributes set. 2969 * 2970 * @param attrs the attributes to build the layout parameters from 2971 * 2972 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2973 * of its descendants 2974 */ 2975 public LayoutParams generateLayoutParams(AttributeSet attrs) { 2976 return new LayoutParams(getContext(), attrs); 2977 } 2978 2979 /** 2980 * Returns a safe set of layout parameters based on the supplied layout params. 2981 * When a ViewGroup is passed a View whose layout params do not pass the test of 2982 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 2983 * is invoked. This method should return a new set of layout params suitable for 2984 * this ViewGroup, possibly by copying the appropriate attributes from the 2985 * specified set of layout params. 2986 * 2987 * @param p The layout parameters to convert into a suitable set of layout parameters 2988 * for this ViewGroup. 2989 * 2990 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2991 * of its descendants 2992 */ 2993 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 2994 return p; 2995 } 2996 2997 /** 2998 * Returns a set of default layout parameters. These parameters are requested 2999 * when the View passed to {@link #addView(View)} has no layout parameters 3000 * already set. If null is returned, an exception is thrown from addView. 3001 * 3002 * @return a set of default layout parameters or null 3003 */ 3004 protected LayoutParams generateDefaultLayoutParams() { 3005 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3006 } 3007 3008 /** 3009 * @hide 3010 */ 3011 @Override 3012 protected boolean dispatchConsistencyCheck(int consistency) { 3013 boolean result = super.dispatchConsistencyCheck(consistency); 3014 3015 final int count = mChildrenCount; 3016 final View[] children = mChildren; 3017 for (int i = 0; i < count; i++) { 3018 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3019 } 3020 3021 return result; 3022 } 3023 3024 /** 3025 * @hide 3026 */ 3027 @Override 3028 protected boolean onConsistencyCheck(int consistency) { 3029 boolean result = super.onConsistencyCheck(consistency); 3030 3031 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3032 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3033 3034 if (checkLayout) { 3035 final int count = mChildrenCount; 3036 final View[] children = mChildren; 3037 for (int i = 0; i < count; i++) { 3038 if (children[i].getParent() != this) { 3039 result = false; 3040 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3041 "View " + children[i] + " has no parent/a parent that is not " + this); 3042 } 3043 } 3044 } 3045 3046 if (checkDrawing) { 3047 // If this group is dirty, check that the parent is dirty as well 3048 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3049 final ViewParent parent = getParent(); 3050 if (parent != null && !(parent instanceof ViewRoot)) { 3051 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3052 result = false; 3053 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3054 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3055 } 3056 } 3057 } 3058 } 3059 3060 return result; 3061 } 3062 3063 /** 3064 * {@inheritDoc} 3065 */ 3066 @Override 3067 protected void debug(int depth) { 3068 super.debug(depth); 3069 String output; 3070 3071 if (mFocused != null) { 3072 output = debugIndent(depth); 3073 output += "mFocused"; 3074 Log.d(VIEW_LOG_TAG, output); 3075 } 3076 if (mChildrenCount != 0) { 3077 output = debugIndent(depth); 3078 output += "{"; 3079 Log.d(VIEW_LOG_TAG, output); 3080 } 3081 int count = mChildrenCount; 3082 for (int i = 0; i < count; i++) { 3083 View child = mChildren[i]; 3084 child.debug(depth + 1); 3085 } 3086 3087 if (mChildrenCount != 0) { 3088 output = debugIndent(depth); 3089 output += "}"; 3090 Log.d(VIEW_LOG_TAG, output); 3091 } 3092 } 3093 3094 /** 3095 * Returns the position in the group of the specified child view. 3096 * 3097 * @param child the view for which to get the position 3098 * @return a positive integer representing the position of the view in the 3099 * group, or -1 if the view does not exist in the group 3100 */ 3101 public int indexOfChild(View child) { 3102 final int count = mChildrenCount; 3103 final View[] children = mChildren; 3104 for (int i = 0; i < count; i++) { 3105 if (children[i] == child) { 3106 return i; 3107 } 3108 } 3109 return -1; 3110 } 3111 3112 /** 3113 * Returns the number of children in the group. 3114 * 3115 * @return a positive integer representing the number of children in 3116 * the group 3117 */ 3118 public int getChildCount() { 3119 return mChildrenCount; 3120 } 3121 3122 /** 3123 * Returns the view at the specified position in the group. 3124 * 3125 * @param index the position at which to get the view from 3126 * @return the view at the specified position or null if the position 3127 * does not exist within the group 3128 */ 3129 public View getChildAt(int index) { 3130 try { 3131 return mChildren[index]; 3132 } catch (IndexOutOfBoundsException ex) { 3133 return null; 3134 } 3135 } 3136 3137 /** 3138 * Ask all of the children of this view to measure themselves, taking into 3139 * account both the MeasureSpec requirements for this view and its padding. 3140 * We skip children that are in the GONE state The heavy lifting is done in 3141 * getChildMeasureSpec. 3142 * 3143 * @param widthMeasureSpec The width requirements for this view 3144 * @param heightMeasureSpec The height requirements for this view 3145 */ 3146 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3147 final int size = mChildrenCount; 3148 final View[] children = mChildren; 3149 for (int i = 0; i < size; ++i) { 3150 final View child = children[i]; 3151 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3152 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3153 } 3154 } 3155 } 3156 3157 /** 3158 * Ask one of the children of this view to measure itself, taking into 3159 * account both the MeasureSpec requirements for this view and its padding. 3160 * The heavy lifting is done in getChildMeasureSpec. 3161 * 3162 * @param child The child to measure 3163 * @param parentWidthMeasureSpec The width requirements for this view 3164 * @param parentHeightMeasureSpec The height requirements for this view 3165 */ 3166 protected void measureChild(View child, int parentWidthMeasureSpec, 3167 int parentHeightMeasureSpec) { 3168 final LayoutParams lp = child.getLayoutParams(); 3169 3170 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3171 mPaddingLeft + mPaddingRight, lp.width); 3172 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3173 mPaddingTop + mPaddingBottom, lp.height); 3174 3175 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3176 } 3177 3178 /** 3179 * Ask one of the children of this view to measure itself, taking into 3180 * account both the MeasureSpec requirements for this view and its padding 3181 * and margins. The child must have MarginLayoutParams The heavy lifting is 3182 * done in getChildMeasureSpec. 3183 * 3184 * @param child The child to measure 3185 * @param parentWidthMeasureSpec The width requirements for this view 3186 * @param widthUsed Extra space that has been used up by the parent 3187 * horizontally (possibly by other children of the parent) 3188 * @param parentHeightMeasureSpec The height requirements for this view 3189 * @param heightUsed Extra space that has been used up by the parent 3190 * vertically (possibly by other children of the parent) 3191 */ 3192 protected void measureChildWithMargins(View child, 3193 int parentWidthMeasureSpec, int widthUsed, 3194 int parentHeightMeasureSpec, int heightUsed) { 3195 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3196 3197 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3198 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3199 + widthUsed, lp.width); 3200 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3201 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3202 + heightUsed, lp.height); 3203 3204 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3205 } 3206 3207 /** 3208 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3209 * pass to a particular child. This method figures out the right MeasureSpec 3210 * for one dimension (height or width) of one child view. 3211 * 3212 * The goal is to combine information from our MeasureSpec with the 3213 * LayoutParams of the child to get the best possible results. For example, 3214 * if the this view knows its size (because its MeasureSpec has a mode of 3215 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3216 * to be the same size as the parent, the parent should ask the child to 3217 * layout given an exact size. 3218 * 3219 * @param spec The requirements for this view 3220 * @param padding The padding of this view for the current dimension and 3221 * margins, if applicable 3222 * @param childDimension How big the child wants to be in the current 3223 * dimension 3224 * @return a MeasureSpec integer for the child 3225 */ 3226 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3227 int specMode = MeasureSpec.getMode(spec); 3228 int specSize = MeasureSpec.getSize(spec); 3229 3230 int size = Math.max(0, specSize - padding); 3231 3232 int resultSize = 0; 3233 int resultMode = 0; 3234 3235 switch (specMode) { 3236 // Parent has imposed an exact size on us 3237 case MeasureSpec.EXACTLY: 3238 if (childDimension >= 0) { 3239 resultSize = childDimension; 3240 resultMode = MeasureSpec.EXACTLY; 3241 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3242 // Child wants to be our size. So be it. 3243 resultSize = size; 3244 resultMode = MeasureSpec.EXACTLY; 3245 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3246 // Child wants to determine its own size. It can't be 3247 // bigger than us. 3248 resultSize = size; 3249 resultMode = MeasureSpec.AT_MOST; 3250 } 3251 break; 3252 3253 // Parent has imposed a maximum size on us 3254 case MeasureSpec.AT_MOST: 3255 if (childDimension >= 0) { 3256 // Child wants a specific size... so be it 3257 resultSize = childDimension; 3258 resultMode = MeasureSpec.EXACTLY; 3259 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3260 // Child wants to be our size, but our size is not fixed. 3261 // Constrain child to not be bigger than us. 3262 resultSize = size; 3263 resultMode = MeasureSpec.AT_MOST; 3264 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3265 // Child wants to determine its own size. It can't be 3266 // bigger than us. 3267 resultSize = size; 3268 resultMode = MeasureSpec.AT_MOST; 3269 } 3270 break; 3271 3272 // Parent asked to see how big we want to be 3273 case MeasureSpec.UNSPECIFIED: 3274 if (childDimension >= 0) { 3275 // Child wants a specific size... let him have it 3276 resultSize = childDimension; 3277 resultMode = MeasureSpec.EXACTLY; 3278 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3279 // Child wants to be our size... find out how big it should 3280 // be 3281 resultSize = 0; 3282 resultMode = MeasureSpec.UNSPECIFIED; 3283 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3284 // Child wants to determine its own size.... find out how 3285 // big it should be 3286 resultSize = 0; 3287 resultMode = MeasureSpec.UNSPECIFIED; 3288 } 3289 break; 3290 } 3291 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3292 } 3293 3294 3295 /** 3296 * Removes any pending animations for views that have been removed. Call 3297 * this if you don't want animations for exiting views to stack up. 3298 */ 3299 public void clearDisappearingChildren() { 3300 if (mDisappearingChildren != null) { 3301 mDisappearingChildren.clear(); 3302 } 3303 } 3304 3305 /** 3306 * Add a view which is removed from mChildren but still needs animation 3307 * 3308 * @param v View to add 3309 */ 3310 private void addDisappearingView(View v) { 3311 ArrayList<View> disappearingChildren = mDisappearingChildren; 3312 3313 if (disappearingChildren == null) { 3314 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3315 } 3316 3317 disappearingChildren.add(v); 3318 } 3319 3320 /** 3321 * Cleanup a view when its animation is done. This may mean removing it from 3322 * the list of disappearing views. 3323 * 3324 * @param view The view whose animation has finished 3325 * @param animation The animation, cannot be null 3326 */ 3327 private void finishAnimatingView(final View view, Animation animation) { 3328 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3329 if (disappearingChildren != null) { 3330 if (disappearingChildren.contains(view)) { 3331 disappearingChildren.remove(view); 3332 3333 if (view.mAttachInfo != null) { 3334 view.dispatchDetachedFromWindow(); 3335 } 3336 3337 view.clearAnimation(); 3338 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3339 } 3340 } 3341 3342 if (animation != null && !animation.getFillAfter()) { 3343 view.clearAnimation(); 3344 } 3345 3346 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3347 view.onAnimationEnd(); 3348 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3349 // so we'd rather be safe than sorry 3350 view.mPrivateFlags &= ~ANIMATION_STARTED; 3351 // Draw one more frame after the animation is done 3352 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3353 } 3354 } 3355 3356 /** 3357 * {@inheritDoc} 3358 */ 3359 @Override 3360 public boolean gatherTransparentRegion(Region region) { 3361 // If no transparent regions requested, we are always opaque. 3362 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3363 if (meOpaque && region == null) { 3364 // The caller doesn't care about the region, so stop now. 3365 return true; 3366 } 3367 super.gatherTransparentRegion(region); 3368 final View[] children = mChildren; 3369 final int count = mChildrenCount; 3370 boolean noneOfTheChildrenAreTransparent = true; 3371 for (int i = 0; i < count; i++) { 3372 final View child = children[i]; 3373 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3374 if (!child.gatherTransparentRegion(region)) { 3375 noneOfTheChildrenAreTransparent = false; 3376 } 3377 } 3378 } 3379 return meOpaque || noneOfTheChildrenAreTransparent; 3380 } 3381 3382 /** 3383 * {@inheritDoc} 3384 */ 3385 public void requestTransparentRegion(View child) { 3386 if (child != null) { 3387 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3388 if (mParent != null) { 3389 mParent.requestTransparentRegion(this); 3390 } 3391 } 3392 } 3393 3394 3395 @Override 3396 protected boolean fitSystemWindows(Rect insets) { 3397 boolean done = super.fitSystemWindows(insets); 3398 if (!done) { 3399 final int count = mChildrenCount; 3400 final View[] children = mChildren; 3401 for (int i = 0; i < count; i++) { 3402 done = children[i].fitSystemWindows(insets); 3403 if (done) { 3404 break; 3405 } 3406 } 3407 } 3408 return done; 3409 } 3410 3411 /** 3412 * Returns the animation listener to which layout animation events are 3413 * sent. 3414 * 3415 * @return an {@link android.view.animation.Animation.AnimationListener} 3416 */ 3417 public Animation.AnimationListener getLayoutAnimationListener() { 3418 return mAnimationListener; 3419 } 3420 3421 @Override 3422 protected void drawableStateChanged() { 3423 super.drawableStateChanged(); 3424 3425 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3426 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3427 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3428 + " child has duplicateParentState set to true"); 3429 } 3430 3431 final View[] children = mChildren; 3432 final int count = mChildrenCount; 3433 3434 for (int i = 0; i < count; i++) { 3435 final View child = children[i]; 3436 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3437 child.refreshDrawableState(); 3438 } 3439 } 3440 } 3441 } 3442 3443 @Override 3444 protected int[] onCreateDrawableState(int extraSpace) { 3445 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3446 return super.onCreateDrawableState(extraSpace); 3447 } 3448 3449 int need = 0; 3450 int n = getChildCount(); 3451 for (int i = 0; i < n; i++) { 3452 int[] childState = getChildAt(i).getDrawableState(); 3453 3454 if (childState != null) { 3455 need += childState.length; 3456 } 3457 } 3458 3459 int[] state = super.onCreateDrawableState(extraSpace + need); 3460 3461 for (int i = 0; i < n; i++) { 3462 int[] childState = getChildAt(i).getDrawableState(); 3463 3464 if (childState != null) { 3465 state = mergeDrawableStates(state, childState); 3466 } 3467 } 3468 3469 return state; 3470 } 3471 3472 /** 3473 * Sets whether this ViewGroup's drawable states also include 3474 * its children's drawable states. This is used, for example, to 3475 * make a group appear to be focused when its child EditText or button 3476 * is focused. 3477 */ 3478 public void setAddStatesFromChildren(boolean addsStates) { 3479 if (addsStates) { 3480 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3481 } else { 3482 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3483 } 3484 3485 refreshDrawableState(); 3486 } 3487 3488 /** 3489 * Returns whether this ViewGroup's drawable states also include 3490 * its children's drawable states. This is used, for example, to 3491 * make a group appear to be focused when its child EditText or button 3492 * is focused. 3493 */ 3494 public boolean addStatesFromChildren() { 3495 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3496 } 3497 3498 /** 3499 * If {link #addStatesFromChildren} is true, refreshes this group's 3500 * drawable state (to include the states from its children). 3501 */ 3502 public void childDrawableStateChanged(View child) { 3503 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3504 refreshDrawableState(); 3505 } 3506 } 3507 3508 /** 3509 * Specifies the animation listener to which layout animation events must 3510 * be sent. Only 3511 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3512 * and 3513 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3514 * are invoked. 3515 * 3516 * @param animationListener the layout animation listener 3517 */ 3518 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3519 mAnimationListener = animationListener; 3520 } 3521 3522 /** 3523 * LayoutParams are used by views to tell their parents how they want to be 3524 * laid out. See 3525 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3526 * for a list of all child view attributes that this class supports. 3527 * 3528 * <p> 3529 * The base LayoutParams class just describes how big the view wants to be 3530 * for both width and height. For each dimension, it can specify one of: 3531 * <ul> 3532 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 3533 * means that the view wants to be as big as its parent (minus padding) 3534 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3535 * to enclose its content (plus padding) 3536 * <li> an exact number 3537 * </ul> 3538 * There are subclasses of LayoutParams for different subclasses of 3539 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3540 * LayoutParams which adds an X and Y value. 3541 * 3542 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3543 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3544 */ 3545 public static class LayoutParams { 3546 /** 3547 * Special value for the height or width requested by a View. 3548 * FILL_PARENT means that the view wants to be as big as its parent, 3549 * minus the parent's padding, if any. This value is deprecated 3550 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 3551 */ 3552 @SuppressWarnings({"UnusedDeclaration"}) 3553 @Deprecated 3554 public static final int FILL_PARENT = -1; 3555 3556 /** 3557 * Special value for the height or width requested by a View. 3558 * MATCH_PARENT means that the view wants to be as big as its parent, 3559 * minus the parent's padding, if any. Introduced in API Level 8. 3560 */ 3561 public static final int MATCH_PARENT = -1; 3562 3563 /** 3564 * Special value for the height or width requested by a View. 3565 * WRAP_CONTENT means that the view wants to be just large enough to fit 3566 * its own internal content, taking its own padding into account. 3567 */ 3568 public static final int WRAP_CONTENT = -2; 3569 3570 /** 3571 * Information about how wide the view wants to be. Can be one of the 3572 * constants FILL_PARENT (replaced by MATCH_PARENT , 3573 * in API Level 8) or WRAP_CONTENT. or an exact size. 3574 */ 3575 @ViewDebug.ExportedProperty(mapping = { 3576 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3577 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3578 }) 3579 public int width; 3580 3581 /** 3582 * Information about how tall the view wants to be. Can be one of the 3583 * constants FILL_PARENT (replaced by MATCH_PARENT , 3584 * in API Level 8) or WRAP_CONTENT. or an exact size. 3585 */ 3586 @ViewDebug.ExportedProperty(mapping = { 3587 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3588 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3589 }) 3590 public int height; 3591 3592 /** 3593 * Used to animate layouts. 3594 */ 3595 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 3596 3597 /** 3598 * Creates a new set of layout parameters. The values are extracted from 3599 * the supplied attributes set and context. The XML attributes mapped 3600 * to this set of layout parameters are: 3601 * 3602 * <ul> 3603 * <li><code>layout_width</code>: the width, either an exact value, 3604 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3605 * {@link #MATCH_PARENT} in API Level 8)</li> 3606 * <li><code>layout_height</code>: the height, either an exact value, 3607 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3608 * {@link #MATCH_PARENT} in API Level 8)</li> 3609 * </ul> 3610 * 3611 * @param c the application environment 3612 * @param attrs the set of attributes from which to extract the layout 3613 * parameters' values 3614 */ 3615 public LayoutParams(Context c, AttributeSet attrs) { 3616 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 3617 setBaseAttributes(a, 3618 R.styleable.ViewGroup_Layout_layout_width, 3619 R.styleable.ViewGroup_Layout_layout_height); 3620 a.recycle(); 3621 } 3622 3623 /** 3624 * Creates a new set of layout parameters with the specified width 3625 * and height. 3626 * 3627 * @param width the width, either {@link #WRAP_CONTENT}, 3628 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3629 * API Level 8), or a fixed size in pixels 3630 * @param height the height, either {@link #WRAP_CONTENT}, 3631 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3632 * API Level 8), or a fixed size in pixels 3633 */ 3634 public LayoutParams(int width, int height) { 3635 this.width = width; 3636 this.height = height; 3637 } 3638 3639 /** 3640 * Copy constructor. Clones the width and height values of the source. 3641 * 3642 * @param source The layout params to copy from. 3643 */ 3644 public LayoutParams(LayoutParams source) { 3645 this.width = source.width; 3646 this.height = source.height; 3647 } 3648 3649 /** 3650 * Used internally by MarginLayoutParams. 3651 * @hide 3652 */ 3653 LayoutParams() { 3654 } 3655 3656 /** 3657 * Extracts the layout parameters from the supplied attributes. 3658 * 3659 * @param a the style attributes to extract the parameters from 3660 * @param widthAttr the identifier of the width attribute 3661 * @param heightAttr the identifier of the height attribute 3662 */ 3663 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 3664 width = a.getLayoutDimension(widthAttr, "layout_width"); 3665 height = a.getLayoutDimension(heightAttr, "layout_height"); 3666 } 3667 3668 /** 3669 * Returns a String representation of this set of layout parameters. 3670 * 3671 * @param output the String to prepend to the internal representation 3672 * @return a String with the following format: output + 3673 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 3674 * 3675 * @hide 3676 */ 3677 public String debug(String output) { 3678 return output + "ViewGroup.LayoutParams={ width=" 3679 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 3680 } 3681 3682 /** 3683 * Converts the specified size to a readable String. 3684 * 3685 * @param size the size to convert 3686 * @return a String instance representing the supplied size 3687 * 3688 * @hide 3689 */ 3690 protected static String sizeToString(int size) { 3691 if (size == WRAP_CONTENT) { 3692 return "wrap-content"; 3693 } 3694 if (size == MATCH_PARENT) { 3695 return "match-parent"; 3696 } 3697 return String.valueOf(size); 3698 } 3699 } 3700 3701 /** 3702 * Per-child layout information for layouts that support margins. 3703 * See 3704 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 3705 * for a list of all child view attributes that this class supports. 3706 */ 3707 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 3708 /** 3709 * The left margin in pixels of the child. 3710 */ 3711 @ViewDebug.ExportedProperty 3712 public int leftMargin; 3713 3714 /** 3715 * The top margin in pixels of the child. 3716 */ 3717 @ViewDebug.ExportedProperty 3718 public int topMargin; 3719 3720 /** 3721 * The right margin in pixels of the child. 3722 */ 3723 @ViewDebug.ExportedProperty 3724 public int rightMargin; 3725 3726 /** 3727 * The bottom margin in pixels of the child. 3728 */ 3729 @ViewDebug.ExportedProperty 3730 public int bottomMargin; 3731 3732 /** 3733 * Creates a new set of layout parameters. The values are extracted from 3734 * the supplied attributes set and context. 3735 * 3736 * @param c the application environment 3737 * @param attrs the set of attributes from which to extract the layout 3738 * parameters' values 3739 */ 3740 public MarginLayoutParams(Context c, AttributeSet attrs) { 3741 super(); 3742 3743 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 3744 setBaseAttributes(a, 3745 R.styleable.ViewGroup_MarginLayout_layout_width, 3746 R.styleable.ViewGroup_MarginLayout_layout_height); 3747 3748 int margin = a.getDimensionPixelSize( 3749 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 3750 if (margin >= 0) { 3751 leftMargin = margin; 3752 topMargin = margin; 3753 rightMargin= margin; 3754 bottomMargin = margin; 3755 } else { 3756 leftMargin = a.getDimensionPixelSize( 3757 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 3758 topMargin = a.getDimensionPixelSize( 3759 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 3760 rightMargin = a.getDimensionPixelSize( 3761 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 3762 bottomMargin = a.getDimensionPixelSize( 3763 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 3764 } 3765 3766 a.recycle(); 3767 } 3768 3769 /** 3770 * {@inheritDoc} 3771 */ 3772 public MarginLayoutParams(int width, int height) { 3773 super(width, height); 3774 } 3775 3776 /** 3777 * Copy constructor. Clones the width, height and margin values of the source. 3778 * 3779 * @param source The layout params to copy from. 3780 */ 3781 public MarginLayoutParams(MarginLayoutParams source) { 3782 this.width = source.width; 3783 this.height = source.height; 3784 3785 this.leftMargin = source.leftMargin; 3786 this.topMargin = source.topMargin; 3787 this.rightMargin = source.rightMargin; 3788 this.bottomMargin = source.bottomMargin; 3789 } 3790 3791 /** 3792 * {@inheritDoc} 3793 */ 3794 public MarginLayoutParams(LayoutParams source) { 3795 super(source); 3796 } 3797 3798 /** 3799 * Sets the margins, in pixels. 3800 * 3801 * @param left the left margin size 3802 * @param top the top margin size 3803 * @param right the right margin size 3804 * @param bottom the bottom margin size 3805 * 3806 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 3807 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 3808 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 3809 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 3810 */ 3811 public void setMargins(int left, int top, int right, int bottom) { 3812 leftMargin = left; 3813 topMargin = top; 3814 rightMargin = right; 3815 bottomMargin = bottom; 3816 } 3817 } 3818} 3819