ViewGroup.java revision b5de9f3bafae2c30e7a67faa1cdf7d1c161820c3
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.graphics.Matrix; 20import com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.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.accessibility.AccessibilityEvent; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import java.util.ArrayList; 45 46/** 47 * <p> 48 * A <code>ViewGroup</code> is a special view that can contain other views 49 * (called children.) The view group is the base class for layouts and views 50 * containers. This class also defines the 51 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 52 * class for layouts parameters. 53 * </p> 54 * 55 * <p> 56 * Also see {@link LayoutParams} for layout attributes. 57 * </p> 58 * 59 * @attr ref android.R.styleable#ViewGroup_clipChildren 60 * @attr ref android.R.styleable#ViewGroup_clipToPadding 61 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 62 * @attr ref android.R.styleable#ViewGroup_animationCache 63 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 64 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 65 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 66 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 67 */ 68public abstract class ViewGroup extends View implements ViewParent, ViewManager { 69 private static final boolean DBG = false; 70 71 /** 72 * Views which have been hidden or removed which need to be animated on 73 * their way out. 74 * This field should be made private, so it is hidden from the SDK. 75 * {@hide} 76 */ 77 protected ArrayList<View> mDisappearingChildren; 78 79 /** 80 * Listener used to propagate events indicating when children are added 81 * and/or removed from a view group. 82 * This field should be made private, so it is hidden from the SDK. 83 * {@hide} 84 */ 85 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 86 87 // The view contained within this ViewGroup that has or contains focus. 88 private View mFocused; 89 90 /** 91 * A Transformation used when drawing children, to 92 * apply on the child being drawn. 93 */ 94 private final Transformation mChildTransformation = new Transformation(); 95 96 /** 97 * Used to track the current invalidation region. 98 */ 99 private RectF mInvalidateRegion; 100 101 /** 102 * A Transformation used to calculate a correct 103 * invalidation area when the application is autoscaled. 104 */ 105 private Transformation mInvalidationTransformation; 106 107 // Target of Motion events 108 private View mMotionTarget; 109 private final Rect mTempRect = new Rect(); 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 * Find the nearest view in the specified direction that wants to take 479 * focus. 480 * 481 * @param focused The view that currently has focus 482 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 483 * FOCUS_RIGHT, or 0 for not applicable. 484 */ 485 public View focusSearch(View focused, int direction) { 486 if (isRootNamespace()) { 487 // root namespace means we should consider ourselves the top of the 488 // tree for focus searching; otherwise we could be focus searching 489 // into other tabs. see LocalActivityManager and TabHost for more info 490 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 491 } else if (mParent != null) { 492 return mParent.focusSearch(focused, direction); 493 } 494 return null; 495 } 496 497 /** 498 * {@inheritDoc} 499 */ 500 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 501 return false; 502 } 503 504 /** 505 * {@inheritDoc} 506 */ 507 @Override 508 public boolean dispatchUnhandledMove(View focused, int direction) { 509 return mFocused != null && 510 mFocused.dispatchUnhandledMove(focused, direction); 511 } 512 513 /** 514 * {@inheritDoc} 515 */ 516 public void clearChildFocus(View child) { 517 if (DBG) { 518 System.out.println(this + " clearChildFocus()"); 519 } 520 521 mFocused = null; 522 if (mParent != null) { 523 mParent.clearChildFocus(this); 524 } 525 } 526 527 /** 528 * {@inheritDoc} 529 */ 530 @Override 531 public void clearFocus() { 532 super.clearFocus(); 533 534 // clear any child focus if it exists 535 if (mFocused != null) { 536 mFocused.clearFocus(); 537 } 538 } 539 540 /** 541 * {@inheritDoc} 542 */ 543 @Override 544 void unFocus() { 545 if (DBG) { 546 System.out.println(this + " unFocus()"); 547 } 548 549 super.unFocus(); 550 if (mFocused != null) { 551 mFocused.unFocus(); 552 } 553 mFocused = null; 554 } 555 556 /** 557 * Returns the focused child of this view, if any. The child may have focus 558 * or contain focus. 559 * 560 * @return the focused child or null. 561 */ 562 public View getFocusedChild() { 563 return mFocused; 564 } 565 566 /** 567 * Returns true if this view has or contains focus 568 * 569 * @return true if this view has or contains focus 570 */ 571 @Override 572 public boolean hasFocus() { 573 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 574 } 575 576 /* 577 * (non-Javadoc) 578 * 579 * @see android.view.View#findFocus() 580 */ 581 @Override 582 public View findFocus() { 583 if (DBG) { 584 System.out.println("Find focus in " + this + ": flags=" 585 + isFocused() + ", child=" + mFocused); 586 } 587 588 if (isFocused()) { 589 return this; 590 } 591 592 if (mFocused != null) { 593 return mFocused.findFocus(); 594 } 595 return null; 596 } 597 598 /** 599 * {@inheritDoc} 600 */ 601 @Override 602 public boolean hasFocusable() { 603 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 604 return false; 605 } 606 607 if (isFocusable()) { 608 return true; 609 } 610 611 final int descendantFocusability = getDescendantFocusability(); 612 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 613 final int count = mChildrenCount; 614 final View[] children = mChildren; 615 616 for (int i = 0; i < count; i++) { 617 final View child = children[i]; 618 if (child.hasFocusable()) { 619 return true; 620 } 621 } 622 } 623 624 return false; 625 } 626 627 /** 628 * {@inheritDoc} 629 */ 630 @Override 631 public void addFocusables(ArrayList<View> views, int direction) { 632 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 633 } 634 635 /** 636 * {@inheritDoc} 637 */ 638 @Override 639 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 640 final int focusableCount = views.size(); 641 642 final int descendantFocusability = getDescendantFocusability(); 643 644 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 645 final int count = mChildrenCount; 646 final View[] children = mChildren; 647 648 for (int i = 0; i < count; i++) { 649 final View child = children[i]; 650 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 651 child.addFocusables(views, direction, focusableMode); 652 } 653 } 654 } 655 656 // we add ourselves (if focusable) in all cases except for when we are 657 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 658 // to avoid the focus search finding layouts when a more precise search 659 // among the focusable children would be more interesting. 660 if ( 661 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 662 // No focusable descendants 663 (focusableCount == views.size())) { 664 super.addFocusables(views, direction, focusableMode); 665 } 666 } 667 668 /** 669 * {@inheritDoc} 670 */ 671 @Override 672 public void dispatchWindowFocusChanged(boolean hasFocus) { 673 super.dispatchWindowFocusChanged(hasFocus); 674 final int count = mChildrenCount; 675 final View[] children = mChildren; 676 for (int i = 0; i < count; i++) { 677 children[i].dispatchWindowFocusChanged(hasFocus); 678 } 679 } 680 681 /** 682 * {@inheritDoc} 683 */ 684 @Override 685 public void addTouchables(ArrayList<View> views) { 686 super.addTouchables(views); 687 688 final int count = mChildrenCount; 689 final View[] children = mChildren; 690 691 for (int i = 0; i < count; i++) { 692 final View child = children[i]; 693 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 694 child.addTouchables(views); 695 } 696 } 697 } 698 699 /** 700 * {@inheritDoc} 701 */ 702 @Override 703 public void dispatchDisplayHint(int hint) { 704 super.dispatchDisplayHint(hint); 705 final int count = mChildrenCount; 706 final View[] children = mChildren; 707 for (int i = 0; i < count; i++) { 708 children[i].dispatchDisplayHint(hint); 709 } 710 } 711 712 /** 713 * {@inheritDoc} 714 */ 715 @Override 716 protected void dispatchVisibilityChanged(View changedView, int visibility) { 717 super.dispatchVisibilityChanged(changedView, visibility); 718 final int count = mChildrenCount; 719 final View[] children = mChildren; 720 for (int i = 0; i < count; i++) { 721 children[i].dispatchVisibilityChanged(changedView, visibility); 722 } 723 } 724 725 /** 726 * {@inheritDoc} 727 */ 728 @Override 729 public void dispatchWindowVisibilityChanged(int visibility) { 730 super.dispatchWindowVisibilityChanged(visibility); 731 final int count = mChildrenCount; 732 final View[] children = mChildren; 733 for (int i = 0; i < count; i++) { 734 children[i].dispatchWindowVisibilityChanged(visibility); 735 } 736 } 737 738 /** 739 * {@inheritDoc} 740 */ 741 @Override 742 public void dispatchConfigurationChanged(Configuration newConfig) { 743 super.dispatchConfigurationChanged(newConfig); 744 final int count = mChildrenCount; 745 final View[] children = mChildren; 746 for (int i = 0; i < count; i++) { 747 children[i].dispatchConfigurationChanged(newConfig); 748 } 749 } 750 751 /** 752 * {@inheritDoc} 753 */ 754 public void recomputeViewAttributes(View child) { 755 ViewParent parent = mParent; 756 if (parent != null) parent.recomputeViewAttributes(this); 757 } 758 759 @Override 760 void dispatchCollectViewAttributes(int visibility) { 761 visibility |= mViewFlags&VISIBILITY_MASK; 762 super.dispatchCollectViewAttributes(visibility); 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 for (int i = 0; i < count; i++) { 766 children[i].dispatchCollectViewAttributes(visibility); 767 } 768 } 769 770 /** 771 * {@inheritDoc} 772 */ 773 public void bringChildToFront(View child) { 774 int index = indexOfChild(child); 775 if (index >= 0) { 776 removeFromArray(index); 777 addInArray(child, mChildrenCount); 778 child.mParent = this; 779 } 780 } 781 782 /** 783 * {@inheritDoc} 784 */ 785 @Override 786 public boolean dispatchKeyEventPreIme(KeyEvent event) { 787 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 788 return super.dispatchKeyEventPreIme(event); 789 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 790 return mFocused.dispatchKeyEventPreIme(event); 791 } 792 return false; 793 } 794 795 /** 796 * {@inheritDoc} 797 */ 798 @Override 799 public boolean dispatchKeyEvent(KeyEvent event) { 800 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 801 return super.dispatchKeyEvent(event); 802 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 803 return mFocused.dispatchKeyEvent(event); 804 } 805 return false; 806 } 807 808 /** 809 * {@inheritDoc} 810 */ 811 @Override 812 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 813 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 814 return super.dispatchKeyShortcutEvent(event); 815 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 816 return mFocused.dispatchKeyShortcutEvent(event); 817 } 818 return false; 819 } 820 821 /** 822 * {@inheritDoc} 823 */ 824 @Override 825 public boolean dispatchTrackballEvent(MotionEvent event) { 826 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 827 return super.dispatchTrackballEvent(event); 828 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 829 return mFocused.dispatchTrackballEvent(event); 830 } 831 return false; 832 } 833 834 /** 835 * {@inheritDoc} 836 */ 837 @Override 838 public boolean dispatchTouchEvent(MotionEvent ev) { 839 final int action = ev.getAction(); 840 final float xf = ev.getX(); 841 final float yf = ev.getY(); 842 final float scrolledXFloat = xf + mScrollX; 843 final float scrolledYFloat = yf + mScrollY; 844 845 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 846 847 if (action == MotionEvent.ACTION_DOWN) { 848 if (mMotionTarget != null) { 849 // this is weird, we got a pen down, but we thought it was 850 // already down! 851 // XXX: We should probably send an ACTION_UP to the current 852 // target. 853 mMotionTarget = null; 854 } 855 // If we're disallowing intercept or if we're allowing and we didn't 856 // intercept 857 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 858 // reset this event's action (just to protect ourselves) 859 ev.setAction(MotionEvent.ACTION_DOWN); 860 // We know we want to dispatch the event down, find a child 861 // who can handle it, start with the front-most child. 862 final View[] children = mChildren; 863 final int count = mChildrenCount; 864 for (int i = count - 1; i >= 0; i--) { 865 final View child = children[i]; 866 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 867 || child.getAnimation() != null) { 868 if (child.dispatchTouchEvent(ev, scrolledXFloat, scrolledYFloat)) { 869 mMotionTarget = child; 870 return true; 871 } 872 } 873 } 874 } 875 } 876 877 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 878 (action == MotionEvent.ACTION_CANCEL); 879 880 if (isUpOrCancel) { 881 // Note, we've already copied the previous state to our local 882 // variable, so this takes effect on the next event 883 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 884 } 885 886 // The event wasn't an ACTION_DOWN, dispatch it to our target if 887 // we have one. 888 final View target = mMotionTarget; 889 if (target == null) { 890 // We don't have a target, this means we're handling the 891 // event as a regular view. 892 ev.setLocation(xf, yf); 893 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 894 ev.setAction(MotionEvent.ACTION_CANCEL); 895 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 896 } 897 return super.dispatchTouchEvent(ev); 898 } 899 900 // if have a target, see if we're allowed to and want to intercept its 901 // events 902 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 903 final float xc = scrolledXFloat - (float) target.mLeft; 904 final float yc = scrolledYFloat - (float) target.mTop; 905 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 906 ev.setAction(MotionEvent.ACTION_CANCEL); 907 ev.setLocation(xc, yc); 908 if (!target.dispatchTouchEvent(ev)) { 909 // target didn't handle ACTION_CANCEL. not much we can do 910 // but they should have. 911 } 912 // clear the target 913 mMotionTarget = null; 914 // Don't dispatch this event to our own view, because we already 915 // saw it when intercepting; we just want to give the following 916 // event to the normal onTouchEvent(). 917 return true; 918 } 919 920 if (isUpOrCancel) { 921 mMotionTarget = null; 922 } 923 924 // finally offset the event to the target's coordinate system and 925 // dispatch the event. 926 float xc; 927 float yc; 928 if (mMatrixIsIdentity || mAttachInfo == null) { 929 xc = scrolledXFloat - (float) target.mLeft; 930 yc = scrolledYFloat - (float) target.mTop; 931 } else { 932 // non-identity matrix: transform the point into the view's coordinates 933 final float[] localXY = mAttachInfo.mTmpTransformLocation; 934 localXY[0] = scrolledXFloat; 935 localXY[1] = scrolledYFloat; 936 getInverseMatrix().mapPoints(localXY); 937 xc = localXY[0] - (float) target.mLeft; 938 yc = localXY[1] - (float) target.mTop; 939 } 940 ev.setLocation(xc, yc); 941 942 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 943 ev.setAction(MotionEvent.ACTION_CANCEL); 944 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 945 mMotionTarget = null; 946 } 947 948 return target.dispatchTouchEvent(ev); 949 } 950 951 /** 952 * {@inheritDoc} 953 */ 954 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 955 956 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 957 // We're already in this state, assume our ancestors are too 958 return; 959 } 960 961 if (disallowIntercept) { 962 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 963 } else { 964 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 965 } 966 967 // Pass it up to our parent 968 if (mParent != null) { 969 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 970 } 971 } 972 973 /** 974 * Implement this method to intercept all touch screen motion events. This 975 * allows you to watch events as they are dispatched to your children, and 976 * take ownership of the current gesture at any point. 977 * 978 * <p>Using this function takes some care, as it has a fairly complicated 979 * interaction with {@link View#onTouchEvent(MotionEvent) 980 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 981 * that method as well as this one in the correct way. Events will be 982 * received in the following order: 983 * 984 * <ol> 985 * <li> You will receive the down event here. 986 * <li> The down event will be handled either by a child of this view 987 * group, or given to your own onTouchEvent() method to handle; this means 988 * you should implement onTouchEvent() to return true, so you will 989 * continue to see the rest of the gesture (instead of looking for 990 * a parent view to handle it). Also, by returning true from 991 * onTouchEvent(), you will not receive any following 992 * events in onInterceptTouchEvent() and all touch processing must 993 * happen in onTouchEvent() like normal. 994 * <li> For as long as you return false from this function, each following 995 * event (up to and including the final up) will be delivered first here 996 * and then to the target's onTouchEvent(). 997 * <li> If you return true from here, you will not receive any 998 * following events: the target view will receive the same event but 999 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1000 * events will be delivered to your onTouchEvent() method and no longer 1001 * appear here. 1002 * </ol> 1003 * 1004 * @param ev The motion event being dispatched down the hierarchy. 1005 * @return Return true to steal motion events from the children and have 1006 * them dispatched to this ViewGroup through onTouchEvent(). 1007 * The current target will receive an ACTION_CANCEL event, and no further 1008 * messages will be delivered here. 1009 */ 1010 public boolean onInterceptTouchEvent(MotionEvent ev) { 1011 return false; 1012 } 1013 1014 /** 1015 * {@inheritDoc} 1016 * 1017 * Looks for a view to give focus to respecting the setting specified by 1018 * {@link #getDescendantFocusability()}. 1019 * 1020 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1021 * find focus within the children of this group when appropriate. 1022 * 1023 * @see #FOCUS_BEFORE_DESCENDANTS 1024 * @see #FOCUS_AFTER_DESCENDANTS 1025 * @see #FOCUS_BLOCK_DESCENDANTS 1026 * @see #onRequestFocusInDescendants 1027 */ 1028 @Override 1029 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1030 if (DBG) { 1031 System.out.println(this + " ViewGroup.requestFocus direction=" 1032 + direction); 1033 } 1034 int descendantFocusability = getDescendantFocusability(); 1035 1036 switch (descendantFocusability) { 1037 case FOCUS_BLOCK_DESCENDANTS: 1038 return super.requestFocus(direction, previouslyFocusedRect); 1039 case FOCUS_BEFORE_DESCENDANTS: { 1040 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1041 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1042 } 1043 case FOCUS_AFTER_DESCENDANTS: { 1044 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1045 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1046 } 1047 default: 1048 throw new IllegalStateException("descendant focusability must be " 1049 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1050 + "but is " + descendantFocusability); 1051 } 1052 } 1053 1054 /** 1055 * Look for a descendant to call {@link View#requestFocus} on. 1056 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1057 * when it wants to request focus within its children. Override this to 1058 * customize how your {@link ViewGroup} requests focus within its children. 1059 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1060 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1061 * to give a finer grained hint about where focus is coming from. May be null 1062 * if there is no hint. 1063 * @return Whether focus was taken. 1064 */ 1065 @SuppressWarnings({"ConstantConditions"}) 1066 protected boolean onRequestFocusInDescendants(int direction, 1067 Rect previouslyFocusedRect) { 1068 int index; 1069 int increment; 1070 int end; 1071 int count = mChildrenCount; 1072 if ((direction & FOCUS_FORWARD) != 0) { 1073 index = 0; 1074 increment = 1; 1075 end = count; 1076 } else { 1077 index = count - 1; 1078 increment = -1; 1079 end = -1; 1080 } 1081 final View[] children = mChildren; 1082 for (int i = index; i != end; i += increment) { 1083 View child = children[i]; 1084 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1085 if (child.requestFocus(direction, previouslyFocusedRect)) { 1086 return true; 1087 } 1088 } 1089 } 1090 return false; 1091 } 1092 1093 /** 1094 * {@inheritDoc} 1095 * 1096 * @hide 1097 */ 1098 @Override 1099 public void dispatchStartTemporaryDetach() { 1100 super.dispatchStartTemporaryDetach(); 1101 final int count = mChildrenCount; 1102 final View[] children = mChildren; 1103 for (int i = 0; i < count; i++) { 1104 children[i].dispatchStartTemporaryDetach(); 1105 } 1106 } 1107 1108 /** 1109 * {@inheritDoc} 1110 * 1111 * @hide 1112 */ 1113 @Override 1114 public void dispatchFinishTemporaryDetach() { 1115 super.dispatchFinishTemporaryDetach(); 1116 final int count = mChildrenCount; 1117 final View[] children = mChildren; 1118 for (int i = 0; i < count; i++) { 1119 children[i].dispatchFinishTemporaryDetach(); 1120 } 1121 } 1122 1123 /** 1124 * {@inheritDoc} 1125 */ 1126 @Override 1127 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1128 super.dispatchAttachedToWindow(info, visibility); 1129 visibility |= mViewFlags & VISIBILITY_MASK; 1130 final int count = mChildrenCount; 1131 final View[] children = mChildren; 1132 for (int i = 0; i < count; i++) { 1133 children[i].dispatchAttachedToWindow(info, visibility); 1134 } 1135 } 1136 1137 @Override 1138 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1139 boolean populated = false; 1140 for (int i = 0, count = getChildCount(); i < count; i++) { 1141 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1142 } 1143 return populated; 1144 } 1145 1146 /** 1147 * {@inheritDoc} 1148 */ 1149 @Override 1150 void dispatchDetachedFromWindow() { 1151 // If we still have a motion target, we are still in the process of 1152 // dispatching motion events to a child; we need to get rid of that 1153 // child to avoid dispatching events to it after the window is torn 1154 // down. To make sure we keep the child in a consistent state, we 1155 // first send it an ACTION_CANCEL motion event. 1156 if (mMotionTarget != null) { 1157 final long now = SystemClock.uptimeMillis(); 1158 final MotionEvent event = MotionEvent.obtain(now, now, 1159 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1160 mMotionTarget.dispatchTouchEvent(event); 1161 event.recycle(); 1162 mMotionTarget = null; 1163 } 1164 1165 final int count = mChildrenCount; 1166 final View[] children = mChildren; 1167 for (int i = 0; i < count; i++) { 1168 children[i].dispatchDetachedFromWindow(); 1169 } 1170 super.dispatchDetachedFromWindow(); 1171 } 1172 1173 /** 1174 * {@inheritDoc} 1175 */ 1176 @Override 1177 public void setPadding(int left, int top, int right, int bottom) { 1178 super.setPadding(left, top, right, bottom); 1179 1180 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1181 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1182 } else { 1183 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1184 } 1185 } 1186 1187 /** 1188 * {@inheritDoc} 1189 */ 1190 @Override 1191 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1192 super.dispatchSaveInstanceState(container); 1193 final int count = mChildrenCount; 1194 final View[] children = mChildren; 1195 for (int i = 0; i < count; i++) { 1196 View c = children[i]; 1197 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1198 c.dispatchSaveInstanceState(container); 1199 } 1200 } 1201 } 1202 1203 /** 1204 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1205 * not to its children. For use when overriding 1206 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1207 * their own state but not the state of their children. 1208 * 1209 * @param container the container 1210 */ 1211 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1212 super.dispatchSaveInstanceState(container); 1213 } 1214 1215 /** 1216 * {@inheritDoc} 1217 */ 1218 @Override 1219 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1220 super.dispatchRestoreInstanceState(container); 1221 final int count = mChildrenCount; 1222 final View[] children = mChildren; 1223 for (int i = 0; i < count; i++) { 1224 View c = children[i]; 1225 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1226 c.dispatchRestoreInstanceState(container); 1227 } 1228 } 1229 } 1230 1231 /** 1232 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1233 * not to its children. For use when overriding 1234 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1235 * their own state but not the state of their children. 1236 * 1237 * @param container the container 1238 */ 1239 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1240 super.dispatchRestoreInstanceState(container); 1241 } 1242 1243 /** 1244 * Enables or disables the drawing cache for each child of this view group. 1245 * 1246 * @param enabled true to enable the cache, false to dispose of it 1247 */ 1248 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1249 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1250 final View[] children = mChildren; 1251 final int count = mChildrenCount; 1252 for (int i = 0; i < count; i++) { 1253 children[i].setDrawingCacheEnabled(enabled); 1254 } 1255 } 1256 } 1257 1258 @Override 1259 protected void onAnimationStart() { 1260 super.onAnimationStart(); 1261 1262 // When this ViewGroup's animation starts, build the cache for the children 1263 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1264 final int count = mChildrenCount; 1265 final View[] children = mChildren; 1266 1267 for (int i = 0; i < count; i++) { 1268 final View child = children[i]; 1269 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1270 child.setDrawingCacheEnabled(true); 1271 child.buildDrawingCache(true); 1272 } 1273 } 1274 1275 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1276 } 1277 } 1278 1279 @Override 1280 protected void onAnimationEnd() { 1281 super.onAnimationEnd(); 1282 1283 // When this ViewGroup's animation ends, destroy the cache of the children 1284 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1285 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1286 1287 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1288 setChildrenDrawingCacheEnabled(false); 1289 } 1290 } 1291 } 1292 1293 @Override 1294 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1295 int count = mChildrenCount; 1296 int[] visibilities = null; 1297 1298 if (skipChildren) { 1299 visibilities = new int[count]; 1300 for (int i = 0; i < count; i++) { 1301 View child = getChildAt(i); 1302 visibilities[i] = child.getVisibility(); 1303 if (visibilities[i] == View.VISIBLE) { 1304 child.setVisibility(INVISIBLE); 1305 } 1306 } 1307 } 1308 1309 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1310 1311 if (skipChildren) { 1312 for (int i = 0; i < count; i++) { 1313 getChildAt(i).setVisibility(visibilities[i]); 1314 } 1315 } 1316 1317 return b; 1318 } 1319 1320 /** 1321 * {@inheritDoc} 1322 */ 1323 @Override 1324 protected void dispatchDraw(Canvas canvas) { 1325 final int count = mChildrenCount; 1326 final View[] children = mChildren; 1327 int flags = mGroupFlags; 1328 1329 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1330 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1331 1332 for (int i = 0; i < count; i++) { 1333 final View child = children[i]; 1334 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1335 final LayoutParams params = child.getLayoutParams(); 1336 attachLayoutAnimationParameters(child, params, i, count); 1337 bindLayoutAnimation(child); 1338 if (cache) { 1339 child.setDrawingCacheEnabled(true); 1340 child.buildDrawingCache(true); 1341 } 1342 } 1343 } 1344 1345 final LayoutAnimationController controller = mLayoutAnimationController; 1346 if (controller.willOverlap()) { 1347 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1348 } 1349 1350 controller.start(); 1351 1352 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1353 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1354 1355 if (cache) { 1356 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1357 } 1358 1359 if (mAnimationListener != null) { 1360 mAnimationListener.onAnimationStart(controller.getAnimation()); 1361 } 1362 } 1363 1364 int saveCount = 0; 1365 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1366 if (clipToPadding) { 1367 saveCount = canvas.save(); 1368 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1369 mScrollX + mRight - mLeft - mPaddingRight, 1370 mScrollY + mBottom - mTop - mPaddingBottom); 1371 1372 } 1373 1374 // We will draw our child's animation, let's reset the flag 1375 mPrivateFlags &= ~DRAW_ANIMATION; 1376 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1377 1378 boolean more = false; 1379 final long drawingTime = getDrawingTime(); 1380 1381 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1382 for (int i = 0; i < count; i++) { 1383 final View child = children[i]; 1384 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1385 more |= drawChild(canvas, child, drawingTime); 1386 } 1387 } 1388 } else { 1389 for (int i = 0; i < count; i++) { 1390 final View child = children[getChildDrawingOrder(count, i)]; 1391 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1392 more |= drawChild(canvas, child, drawingTime); 1393 } 1394 } 1395 } 1396 1397 // Draw any disappearing views that have animations 1398 if (mDisappearingChildren != null) { 1399 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1400 final int disappearingCount = disappearingChildren.size() - 1; 1401 // Go backwards -- we may delete as animations finish 1402 for (int i = disappearingCount; i >= 0; i--) { 1403 final View child = disappearingChildren.get(i); 1404 more |= drawChild(canvas, child, drawingTime); 1405 } 1406 } 1407 1408 if (clipToPadding) { 1409 canvas.restoreToCount(saveCount); 1410 } 1411 1412 // mGroupFlags might have been updated by drawChild() 1413 flags = mGroupFlags; 1414 1415 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1416 invalidate(); 1417 } 1418 1419 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1420 mLayoutAnimationController.isDone() && !more) { 1421 // We want to erase the drawing cache and notify the listener after the 1422 // next frame is drawn because one extra invalidate() is caused by 1423 // drawChild() after the animation is over 1424 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1425 final Runnable end = new Runnable() { 1426 public void run() { 1427 notifyAnimationListener(); 1428 } 1429 }; 1430 post(end); 1431 } 1432 } 1433 1434 /** 1435 * Returns the index of the child to draw for this iteration. Override this 1436 * if you want to change the drawing order of children. By default, it 1437 * returns i. 1438 * <p> 1439 * NOTE: In order for this method to be called, you must enable child ordering 1440 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1441 * 1442 * @param i The current iteration. 1443 * @return The index of the child to draw this iteration. 1444 * 1445 * @see #setChildrenDrawingOrderEnabled(boolean) 1446 * @see #isChildrenDrawingOrderEnabled() 1447 */ 1448 protected int getChildDrawingOrder(int childCount, int i) { 1449 return i; 1450 } 1451 1452 private void notifyAnimationListener() { 1453 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1454 mGroupFlags |= FLAG_ANIMATION_DONE; 1455 1456 if (mAnimationListener != null) { 1457 final Runnable end = new Runnable() { 1458 public void run() { 1459 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1460 } 1461 }; 1462 post(end); 1463 } 1464 1465 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1466 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1467 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1468 setChildrenDrawingCacheEnabled(false); 1469 } 1470 } 1471 1472 invalidate(); 1473 } 1474 1475 /** 1476 * Draw one child of this View Group. This method is responsible for getting 1477 * the canvas in the right state. This includes clipping, translating so 1478 * that the child's scrolled origin is at 0, 0, and applying any animation 1479 * transformations. 1480 * 1481 * @param canvas The canvas on which to draw the child 1482 * @param child Who to draw 1483 * @param drawingTime The time at which draw is occuring 1484 * @return True if an invalidate() was issued 1485 */ 1486 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1487 boolean more = false; 1488 1489 final int cl = child.mLeft; 1490 final int ct = child.mTop; 1491 final int cr = child.mRight; 1492 final int cb = child.mBottom; 1493 1494 final int flags = mGroupFlags; 1495 1496 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1497 mChildTransformation.clear(); 1498 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1499 } 1500 1501 Transformation transformToApply = null; 1502 Transformation invalidationTransform; 1503 final Animation a = child.getAnimation(); 1504 boolean concatMatrix = false; 1505 1506 boolean scalingRequired = false; 1507 boolean caching = false; 1508 if (!canvas.isHardwareAccelerated() && 1509 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1510 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1511 caching = true; 1512 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1513 } 1514 1515 if (a != null) { 1516 1517 final boolean initialized = a.isInitialized(); 1518 if (!initialized) { 1519 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1520 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1521 child.onAnimationStart(); 1522 } 1523 1524 more = a.getTransformation(drawingTime, mChildTransformation, 1525 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1526 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1527 if (mInvalidationTransformation == null) { 1528 mInvalidationTransformation = new Transformation(); 1529 } 1530 invalidationTransform = mInvalidationTransformation; 1531 a.getTransformation(drawingTime, invalidationTransform, 1f); 1532 } else { 1533 invalidationTransform = mChildTransformation; 1534 } 1535 transformToApply = mChildTransformation; 1536 1537 concatMatrix = a.willChangeTransformationMatrix(); 1538 1539 if (more) { 1540 if (!a.willChangeBounds()) { 1541 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1542 FLAG_OPTIMIZE_INVALIDATE) { 1543 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1544 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1545 // The child need to draw an animation, potentially offscreen, so 1546 // make sure we do not cancel invalidate requests 1547 mPrivateFlags |= DRAW_ANIMATION; 1548 invalidate(cl, ct, cr, cb); 1549 } 1550 } else { 1551 if (mInvalidateRegion == null) { 1552 mInvalidateRegion = new RectF(); 1553 } 1554 final RectF region = mInvalidateRegion; 1555 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1556 1557 // The child need to draw an animation, potentially offscreen, so 1558 // make sure we do not cancel invalidate requests 1559 mPrivateFlags |= DRAW_ANIMATION; 1560 1561 final int left = cl + (int) region.left; 1562 final int top = ct + (int) region.top; 1563 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1564 } 1565 } 1566 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1567 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1568 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1569 if (hasTransform) { 1570 final int transformType = mChildTransformation.getTransformationType(); 1571 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1572 mChildTransformation : null; 1573 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1574 } 1575 } 1576 1577 // Sets the flag as early as possible to allow draw() implementations 1578 // to call invalidate() successfully when doing animations 1579 child.mPrivateFlags |= DRAWN; 1580 1581 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1582 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1583 return more; 1584 } 1585 1586 child.computeScroll(); 1587 1588 final int sx = child.mScrollX; 1589 final int sy = child.mScrollY; 1590 1591 Bitmap cache = null; 1592 if (caching) { 1593 cache = child.getDrawingCache(true); 1594 } 1595 1596 final boolean hasNoCache = cache == null; 1597 1598 final int restoreTo = canvas.save(); 1599 if (hasNoCache) { 1600 canvas.translate(cl - sx, ct - sy); 1601 } else { 1602 canvas.translate(cl, ct); 1603 if (scalingRequired) { 1604 // mAttachInfo cannot be null, otherwise scalingRequired == false 1605 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1606 canvas.scale(scale, scale); 1607 } 1608 } 1609 1610 float alpha = child.getAlpha(); 1611 1612 if (transformToApply != null || alpha < 1.0f || !child.mMatrixIsIdentity) { 1613 int transX = 0; 1614 int transY = 0; 1615 if (hasNoCache) { 1616 transX = -sx; 1617 transY = -sy; 1618 } 1619 if (transformToApply != null) { 1620 if (concatMatrix) { 1621 // Undo the scroll translation, apply the transformation matrix, 1622 // then redo the scroll translate to get the correct result. 1623 canvas.translate(-transX, -transY); 1624 canvas.concat(transformToApply.getMatrix()); 1625 canvas.translate(transX, transY); 1626 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1627 } 1628 float transformAlpha = transformToApply.getAlpha(); 1629 if (transformAlpha < 1.0f) { 1630 alpha *= transformToApply.getAlpha(); 1631 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1632 } 1633 } 1634 if (!child.mMatrixIsIdentity) { 1635 canvas.translate(-transX, -transY); 1636 canvas.concat(child.getMatrix()); 1637 canvas.translate(transX, transY); 1638 } 1639 if (alpha < 1.0f) { 1640 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1641 } 1642 1643 if (alpha < 1.0f && hasNoCache) { 1644 final int multipliedAlpha = (int) (255 * alpha); 1645 if (!child.onSetAlpha(multipliedAlpha)) { 1646 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1647 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1648 } else { 1649 child.mPrivateFlags |= ALPHA_SET; 1650 } 1651 } 1652 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1653 child.onSetAlpha(255); 1654 } 1655 1656 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1657 if (hasNoCache) { 1658 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1659 } else { 1660 if (!scalingRequired) { 1661 canvas.clipRect(0, 0, cr - cl, cb - ct); 1662 } else { 1663 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 1664 } 1665 } 1666 } 1667 1668 if (hasNoCache) { 1669 // Fast path for layouts with no backgrounds 1670 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 1671 if (ViewDebug.TRACE_HIERARCHY) { 1672 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 1673 } 1674 child.mPrivateFlags &= ~DIRTY_MASK; 1675 child.dispatchDraw(canvas); 1676 } else { 1677 child.draw(canvas); 1678 } 1679 } else { 1680 final Paint cachePaint = mCachePaint; 1681 if (alpha < 1.0f) { 1682 cachePaint.setAlpha((int) (alpha * 255)); 1683 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 1684 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 1685 cachePaint.setAlpha(255); 1686 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 1687 } 1688 if (Config.DEBUG && ViewDebug.profileDrawing) { 1689 EventLog.writeEvent(60003, hashCode()); 1690 } 1691 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 1692 } 1693 1694 canvas.restoreToCount(restoreTo); 1695 1696 if (a != null && !more) { 1697 child.onSetAlpha(255); 1698 finishAnimatingView(child, a); 1699 } 1700 1701 return more; 1702 } 1703 1704 /** 1705 * By default, children are clipped to their bounds before drawing. This 1706 * allows view groups to override this behavior for animations, etc. 1707 * 1708 * @param clipChildren true to clip children to their bounds, 1709 * false otherwise 1710 * @attr ref android.R.styleable#ViewGroup_clipChildren 1711 */ 1712 public void setClipChildren(boolean clipChildren) { 1713 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 1714 } 1715 1716 /** 1717 * By default, children are clipped to the padding of the ViewGroup. This 1718 * allows view groups to override this behavior 1719 * 1720 * @param clipToPadding true to clip children to the padding of the 1721 * group, false otherwise 1722 * @attr ref android.R.styleable#ViewGroup_clipToPadding 1723 */ 1724 public void setClipToPadding(boolean clipToPadding) { 1725 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 1726 } 1727 1728 /** 1729 * {@inheritDoc} 1730 */ 1731 @Override 1732 public void dispatchSetSelected(boolean selected) { 1733 final View[] children = mChildren; 1734 final int count = mChildrenCount; 1735 for (int i = 0; i < count; i++) { 1736 children[i].setSelected(selected); 1737 } 1738 } 1739 1740 @Override 1741 protected void dispatchSetPressed(boolean pressed) { 1742 final View[] children = mChildren; 1743 final int count = mChildrenCount; 1744 for (int i = 0; i < count; i++) { 1745 children[i].setPressed(pressed); 1746 } 1747 } 1748 1749 /** 1750 * When this property is set to true, this ViewGroup supports static transformations on 1751 * children; this causes 1752 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 1753 * invoked when a child is drawn. 1754 * 1755 * Any subclass overriding 1756 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 1757 * set this property to true. 1758 * 1759 * @param enabled True to enable static transformations on children, false otherwise. 1760 * 1761 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 1762 */ 1763 protected void setStaticTransformationsEnabled(boolean enabled) { 1764 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 1765 } 1766 1767 /** 1768 * {@inheritDoc} 1769 * 1770 * @see #setStaticTransformationsEnabled(boolean) 1771 */ 1772 protected boolean getChildStaticTransformation(View child, Transformation t) { 1773 return false; 1774 } 1775 1776 /** 1777 * {@hide} 1778 */ 1779 @Override 1780 protected View findViewTraversal(int id) { 1781 if (id == mID) { 1782 return this; 1783 } 1784 1785 final View[] where = mChildren; 1786 final int len = mChildrenCount; 1787 1788 for (int i = 0; i < len; i++) { 1789 View v = where[i]; 1790 1791 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1792 v = v.findViewById(id); 1793 1794 if (v != null) { 1795 return v; 1796 } 1797 } 1798 } 1799 1800 return null; 1801 } 1802 1803 /** 1804 * {@hide} 1805 */ 1806 @Override 1807 protected View findViewWithTagTraversal(Object tag) { 1808 if (tag != null && tag.equals(mTag)) { 1809 return this; 1810 } 1811 1812 final View[] where = mChildren; 1813 final int len = mChildrenCount; 1814 1815 for (int i = 0; i < len; i++) { 1816 View v = where[i]; 1817 1818 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1819 v = v.findViewWithTag(tag); 1820 1821 if (v != null) { 1822 return v; 1823 } 1824 } 1825 } 1826 1827 return null; 1828 } 1829 1830 /** 1831 * Adds a child view. If no layout parameters are already set on the child, the 1832 * default parameters for this ViewGroup are set on the child. 1833 * 1834 * @param child the child view to add 1835 * 1836 * @see #generateDefaultLayoutParams() 1837 */ 1838 public void addView(View child) { 1839 addView(child, -1); 1840 } 1841 1842 /** 1843 * Adds a child view. If no layout parameters are already set on the child, the 1844 * default parameters for this ViewGroup are set on the child. 1845 * 1846 * @param child the child view to add 1847 * @param index the position at which to add the child 1848 * 1849 * @see #generateDefaultLayoutParams() 1850 */ 1851 public void addView(View child, int index) { 1852 LayoutParams params = child.getLayoutParams(); 1853 if (params == null) { 1854 params = generateDefaultLayoutParams(); 1855 if (params == null) { 1856 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 1857 } 1858 } 1859 addView(child, index, params); 1860 } 1861 1862 /** 1863 * Adds a child view with this ViewGroup's default layout parameters and the 1864 * specified width and height. 1865 * 1866 * @param child the child view to add 1867 */ 1868 public void addView(View child, int width, int height) { 1869 final LayoutParams params = generateDefaultLayoutParams(); 1870 params.width = width; 1871 params.height = height; 1872 addView(child, -1, params); 1873 } 1874 1875 /** 1876 * Adds a child view with the specified layout parameters. 1877 * 1878 * @param child the child view to add 1879 * @param params the layout parameters to set on the child 1880 */ 1881 public void addView(View child, LayoutParams params) { 1882 addView(child, -1, params); 1883 } 1884 1885 /** 1886 * Adds a child view with the specified layout parameters. 1887 * 1888 * @param child the child view to add 1889 * @param index the position at which to add the child 1890 * @param params the layout parameters to set on the child 1891 */ 1892 public void addView(View child, int index, LayoutParams params) { 1893 if (DBG) { 1894 System.out.println(this + " addView"); 1895 } 1896 1897 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 1898 // therefore, we call requestLayout() on ourselves before, so that the child's request 1899 // will be blocked at our level 1900 requestLayout(); 1901 invalidate(); 1902 addViewInner(child, index, params, false); 1903 } 1904 1905 /** 1906 * {@inheritDoc} 1907 */ 1908 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 1909 if (!checkLayoutParams(params)) { 1910 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 1911 } 1912 if (view.mParent != this) { 1913 throw new IllegalArgumentException("Given view not a child of " + this); 1914 } 1915 view.setLayoutParams(params); 1916 } 1917 1918 /** 1919 * {@inheritDoc} 1920 */ 1921 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 1922 return p != null; 1923 } 1924 1925 /** 1926 * Interface definition for a callback to be invoked when the hierarchy 1927 * within this view changed. The hierarchy changes whenever a child is added 1928 * to or removed from this view. 1929 */ 1930 public interface OnHierarchyChangeListener { 1931 /** 1932 * Called when a new child is added to a parent view. 1933 * 1934 * @param parent the view in which a child was added 1935 * @param child the new child view added in the hierarchy 1936 */ 1937 void onChildViewAdded(View parent, View child); 1938 1939 /** 1940 * Called when a child is removed from a parent view. 1941 * 1942 * @param parent the view from which the child was removed 1943 * @param child the child removed from the hierarchy 1944 */ 1945 void onChildViewRemoved(View parent, View child); 1946 } 1947 1948 /** 1949 * Register a callback to be invoked when a child is added to or removed 1950 * from this view. 1951 * 1952 * @param listener the callback to invoke on hierarchy change 1953 */ 1954 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 1955 mOnHierarchyChangeListener = listener; 1956 } 1957 1958 /** 1959 * Adds a view during layout. This is useful if in your onLayout() method, 1960 * you need to add more views (as does the list view for example). 1961 * 1962 * If index is negative, it means put it at the end of the list. 1963 * 1964 * @param child the view to add to the group 1965 * @param index the index at which the child must be added 1966 * @param params the layout parameters to associate with the child 1967 * @return true if the child was added, false otherwise 1968 */ 1969 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 1970 return addViewInLayout(child, index, params, false); 1971 } 1972 1973 /** 1974 * Adds a view during layout. This is useful if in your onLayout() method, 1975 * you need to add more views (as does the list view for example). 1976 * 1977 * If index is negative, it means put it at the end of the list. 1978 * 1979 * @param child the view to add to the group 1980 * @param index the index at which the child must be added 1981 * @param params the layout parameters to associate with the child 1982 * @param preventRequestLayout if true, calling this method will not trigger a 1983 * layout request on child 1984 * @return true if the child was added, false otherwise 1985 */ 1986 protected boolean addViewInLayout(View child, int index, LayoutParams params, 1987 boolean preventRequestLayout) { 1988 child.mParent = null; 1989 addViewInner(child, index, params, preventRequestLayout); 1990 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 1991 return true; 1992 } 1993 1994 /** 1995 * Prevents the specified child to be laid out during the next layout pass. 1996 * 1997 * @param child the child on which to perform the cleanup 1998 */ 1999 protected void cleanupLayoutState(View child) { 2000 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2001 } 2002 2003 private void addViewInner(View child, int index, LayoutParams params, 2004 boolean preventRequestLayout) { 2005 2006 if (child.getParent() != null) { 2007 throw new IllegalStateException("The specified child already has a parent. " + 2008 "You must call removeView() on the child's parent first."); 2009 } 2010 2011 if (!checkLayoutParams(params)) { 2012 params = generateLayoutParams(params); 2013 } 2014 2015 if (preventRequestLayout) { 2016 child.mLayoutParams = params; 2017 } else { 2018 child.setLayoutParams(params); 2019 } 2020 2021 if (index < 0) { 2022 index = mChildrenCount; 2023 } 2024 2025 addInArray(child, index); 2026 2027 // tell our children 2028 if (preventRequestLayout) { 2029 child.assignParent(this); 2030 } else { 2031 child.mParent = this; 2032 } 2033 2034 if (child.hasFocus()) { 2035 requestChildFocus(child, child.findFocus()); 2036 } 2037 2038 AttachInfo ai = mAttachInfo; 2039 if (ai != null) { 2040 boolean lastKeepOn = ai.mKeepScreenOn; 2041 ai.mKeepScreenOn = false; 2042 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2043 if (ai.mKeepScreenOn) { 2044 needGlobalAttributesUpdate(true); 2045 } 2046 ai.mKeepScreenOn = lastKeepOn; 2047 } 2048 2049 if (mOnHierarchyChangeListener != null) { 2050 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2051 } 2052 2053 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2054 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2055 } 2056 } 2057 2058 private void addInArray(View child, int index) { 2059 View[] children = mChildren; 2060 final int count = mChildrenCount; 2061 final int size = children.length; 2062 if (index == count) { 2063 if (size == count) { 2064 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2065 System.arraycopy(children, 0, mChildren, 0, size); 2066 children = mChildren; 2067 } 2068 children[mChildrenCount++] = child; 2069 } else if (index < count) { 2070 if (size == count) { 2071 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2072 System.arraycopy(children, 0, mChildren, 0, index); 2073 System.arraycopy(children, index, mChildren, index + 1, count - index); 2074 children = mChildren; 2075 } else { 2076 System.arraycopy(children, index, children, index + 1, count - index); 2077 } 2078 children[index] = child; 2079 mChildrenCount++; 2080 } else { 2081 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2082 } 2083 } 2084 2085 // This method also sets the child's mParent to null 2086 private void removeFromArray(int index) { 2087 final View[] children = mChildren; 2088 children[index].mParent = null; 2089 final int count = mChildrenCount; 2090 if (index == count - 1) { 2091 children[--mChildrenCount] = null; 2092 } else if (index >= 0 && index < count) { 2093 System.arraycopy(children, index + 1, children, index, count - index - 1); 2094 children[--mChildrenCount] = null; 2095 } else { 2096 throw new IndexOutOfBoundsException(); 2097 } 2098 } 2099 2100 // This method also sets the children's mParent to null 2101 private void removeFromArray(int start, int count) { 2102 final View[] children = mChildren; 2103 final int childrenCount = mChildrenCount; 2104 2105 start = Math.max(0, start); 2106 final int end = Math.min(childrenCount, start + count); 2107 2108 if (start == end) { 2109 return; 2110 } 2111 2112 if (end == childrenCount) { 2113 for (int i = start; i < end; i++) { 2114 children[i].mParent = null; 2115 children[i] = null; 2116 } 2117 } else { 2118 for (int i = start; i < end; i++) { 2119 children[i].mParent = null; 2120 } 2121 2122 // Since we're looping above, we might as well do the copy, but is arraycopy() 2123 // faster than the extra 2 bounds checks we would do in the loop? 2124 System.arraycopy(children, end, children, start, childrenCount - end); 2125 2126 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2127 children[i] = null; 2128 } 2129 } 2130 2131 mChildrenCount -= (end - start); 2132 } 2133 2134 private void bindLayoutAnimation(View child) { 2135 Animation a = mLayoutAnimationController.getAnimationForView(child); 2136 child.setAnimation(a); 2137 } 2138 2139 /** 2140 * Subclasses should override this method to set layout animation 2141 * parameters on the supplied child. 2142 * 2143 * @param child the child to associate with animation parameters 2144 * @param params the child's layout parameters which hold the animation 2145 * parameters 2146 * @param index the index of the child in the view group 2147 * @param count the number of children in the view group 2148 */ 2149 protected void attachLayoutAnimationParameters(View child, 2150 LayoutParams params, int index, int count) { 2151 LayoutAnimationController.AnimationParameters animationParams = 2152 params.layoutAnimationParameters; 2153 if (animationParams == null) { 2154 animationParams = new LayoutAnimationController.AnimationParameters(); 2155 params.layoutAnimationParameters = animationParams; 2156 } 2157 2158 animationParams.count = count; 2159 animationParams.index = index; 2160 } 2161 2162 /** 2163 * {@inheritDoc} 2164 */ 2165 public void removeView(View view) { 2166 removeViewInternal(view); 2167 requestLayout(); 2168 invalidate(); 2169 } 2170 2171 /** 2172 * Removes a view during layout. This is useful if in your onLayout() method, 2173 * you need to remove more views. 2174 * 2175 * @param view the view to remove from the group 2176 */ 2177 public void removeViewInLayout(View view) { 2178 removeViewInternal(view); 2179 } 2180 2181 /** 2182 * Removes a range of views during layout. This is useful if in your onLayout() method, 2183 * you need to remove more views. 2184 * 2185 * @param start the index of the first view to remove from the group 2186 * @param count the number of views to remove from the group 2187 */ 2188 public void removeViewsInLayout(int start, int count) { 2189 removeViewsInternal(start, count); 2190 } 2191 2192 /** 2193 * Removes the view at the specified position in the group. 2194 * 2195 * @param index the position in the group of the view to remove 2196 */ 2197 public void removeViewAt(int index) { 2198 removeViewInternal(index, getChildAt(index)); 2199 requestLayout(); 2200 invalidate(); 2201 } 2202 2203 /** 2204 * Removes the specified range of views from the group. 2205 * 2206 * @param start the first position in the group of the range of views to remove 2207 * @param count the number of views to remove 2208 */ 2209 public void removeViews(int start, int count) { 2210 removeViewsInternal(start, count); 2211 requestLayout(); 2212 invalidate(); 2213 } 2214 2215 private void removeViewInternal(View view) { 2216 final int index = indexOfChild(view); 2217 if (index >= 0) { 2218 removeViewInternal(index, view); 2219 } 2220 } 2221 2222 private void removeViewInternal(int index, View view) { 2223 boolean clearChildFocus = false; 2224 if (view == mFocused) { 2225 view.clearFocusForRemoval(); 2226 clearChildFocus = true; 2227 } 2228 2229 if (view.getAnimation() != null) { 2230 addDisappearingView(view); 2231 } else if (view.mAttachInfo != null) { 2232 view.dispatchDetachedFromWindow(); 2233 } 2234 2235 if (mOnHierarchyChangeListener != null) { 2236 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2237 } 2238 2239 needGlobalAttributesUpdate(false); 2240 2241 removeFromArray(index); 2242 2243 if (clearChildFocus) { 2244 clearChildFocus(view); 2245 } 2246 } 2247 2248 private void removeViewsInternal(int start, int count) { 2249 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2250 final boolean notifyListener = onHierarchyChangeListener != null; 2251 final View focused = mFocused; 2252 final boolean detach = mAttachInfo != null; 2253 View clearChildFocus = null; 2254 2255 final View[] children = mChildren; 2256 final int end = start + count; 2257 2258 for (int i = start; i < end; i++) { 2259 final View view = children[i]; 2260 2261 if (view == focused) { 2262 view.clearFocusForRemoval(); 2263 clearChildFocus = view; 2264 } 2265 2266 if (view.getAnimation() != null) { 2267 addDisappearingView(view); 2268 } else if (detach) { 2269 view.dispatchDetachedFromWindow(); 2270 } 2271 2272 needGlobalAttributesUpdate(false); 2273 2274 if (notifyListener) { 2275 onHierarchyChangeListener.onChildViewRemoved(this, view); 2276 } 2277 } 2278 2279 removeFromArray(start, count); 2280 2281 if (clearChildFocus != null) { 2282 clearChildFocus(clearChildFocus); 2283 } 2284 } 2285 2286 /** 2287 * Call this method to remove all child views from the 2288 * ViewGroup. 2289 */ 2290 public void removeAllViews() { 2291 removeAllViewsInLayout(); 2292 requestLayout(); 2293 invalidate(); 2294 } 2295 2296 /** 2297 * Called by a ViewGroup subclass to remove child views from itself, 2298 * when it must first know its size on screen before it can calculate how many 2299 * child views it will render. An example is a Gallery or a ListView, which 2300 * may "have" 50 children, but actually only render the number of children 2301 * that can currently fit inside the object on screen. Do not call 2302 * this method unless you are extending ViewGroup and understand the 2303 * view measuring and layout pipeline. 2304 */ 2305 public void removeAllViewsInLayout() { 2306 final int count = mChildrenCount; 2307 if (count <= 0) { 2308 return; 2309 } 2310 2311 final View[] children = mChildren; 2312 mChildrenCount = 0; 2313 2314 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2315 final boolean notify = listener != null; 2316 final View focused = mFocused; 2317 final boolean detach = mAttachInfo != null; 2318 View clearChildFocus = null; 2319 2320 needGlobalAttributesUpdate(false); 2321 2322 for (int i = count - 1; i >= 0; i--) { 2323 final View view = children[i]; 2324 2325 if (view == focused) { 2326 view.clearFocusForRemoval(); 2327 clearChildFocus = view; 2328 } 2329 2330 if (view.getAnimation() != null) { 2331 addDisappearingView(view); 2332 } else if (detach) { 2333 view.dispatchDetachedFromWindow(); 2334 } 2335 2336 if (notify) { 2337 listener.onChildViewRemoved(this, view); 2338 } 2339 2340 view.mParent = null; 2341 children[i] = null; 2342 } 2343 2344 if (clearChildFocus != null) { 2345 clearChildFocus(clearChildFocus); 2346 } 2347 } 2348 2349 /** 2350 * Finishes the removal of a detached view. This method will dispatch the detached from 2351 * window event and notify the hierarchy change listener. 2352 * 2353 * @param child the child to be definitely removed from the view hierarchy 2354 * @param animate if true and the view has an animation, the view is placed in the 2355 * disappearing views list, otherwise, it is detached from the window 2356 * 2357 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2358 * @see #detachAllViewsFromParent() 2359 * @see #detachViewFromParent(View) 2360 * @see #detachViewFromParent(int) 2361 */ 2362 protected void removeDetachedView(View child, boolean animate) { 2363 if (child == mFocused) { 2364 child.clearFocus(); 2365 } 2366 2367 if (animate && child.getAnimation() != null) { 2368 addDisappearingView(child); 2369 } else if (child.mAttachInfo != null) { 2370 child.dispatchDetachedFromWindow(); 2371 } 2372 2373 if (mOnHierarchyChangeListener != null) { 2374 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2375 } 2376 } 2377 2378 /** 2379 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2380 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2381 * by calling {@link #getChildAt(int)}. 2382 * 2383 * This method should be called only for view which were detached from their parent. 2384 * 2385 * @param child the child to attach 2386 * @param index the index at which the child should be attached 2387 * @param params the layout parameters of the child 2388 * 2389 * @see #removeDetachedView(View, boolean) 2390 * @see #detachAllViewsFromParent() 2391 * @see #detachViewFromParent(View) 2392 * @see #detachViewFromParent(int) 2393 */ 2394 protected void attachViewToParent(View child, int index, LayoutParams params) { 2395 child.mLayoutParams = params; 2396 2397 if (index < 0) { 2398 index = mChildrenCount; 2399 } 2400 2401 addInArray(child, index); 2402 2403 child.mParent = this; 2404 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2405 2406 if (child.hasFocus()) { 2407 requestChildFocus(child, child.findFocus()); 2408 } 2409 } 2410 2411 /** 2412 * Detaches a view from its parent. Detaching a view should be temporary and followed 2413 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2414 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2415 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2416 * 2417 * @param child the child to detach 2418 * 2419 * @see #detachViewFromParent(int) 2420 * @see #detachViewsFromParent(int, int) 2421 * @see #detachAllViewsFromParent() 2422 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2423 * @see #removeDetachedView(View, boolean) 2424 */ 2425 protected void detachViewFromParent(View child) { 2426 removeFromArray(indexOfChild(child)); 2427 } 2428 2429 /** 2430 * Detaches a view from its parent. Detaching a view should be temporary and followed 2431 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2432 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2433 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2434 * 2435 * @param index the index of the child to detach 2436 * 2437 * @see #detachViewFromParent(View) 2438 * @see #detachAllViewsFromParent() 2439 * @see #detachViewsFromParent(int, int) 2440 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2441 * @see #removeDetachedView(View, boolean) 2442 */ 2443 protected void detachViewFromParent(int index) { 2444 removeFromArray(index); 2445 } 2446 2447 /** 2448 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2449 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2450 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2451 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2452 * 2453 * @param start the first index of the childrend range to detach 2454 * @param count the number of children to detach 2455 * 2456 * @see #detachViewFromParent(View) 2457 * @see #detachViewFromParent(int) 2458 * @see #detachAllViewsFromParent() 2459 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2460 * @see #removeDetachedView(View, boolean) 2461 */ 2462 protected void detachViewsFromParent(int start, int count) { 2463 removeFromArray(start, count); 2464 } 2465 2466 /** 2467 * Detaches all views from the parent. Detaching a view should be temporary and followed 2468 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2469 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2470 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2471 * 2472 * @see #detachViewFromParent(View) 2473 * @see #detachViewFromParent(int) 2474 * @see #detachViewsFromParent(int, int) 2475 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2476 * @see #removeDetachedView(View, boolean) 2477 */ 2478 protected void detachAllViewsFromParent() { 2479 final int count = mChildrenCount; 2480 if (count <= 0) { 2481 return; 2482 } 2483 2484 final View[] children = mChildren; 2485 mChildrenCount = 0; 2486 2487 for (int i = count - 1; i >= 0; i--) { 2488 children[i].mParent = null; 2489 children[i] = null; 2490 } 2491 } 2492 2493 /** 2494 * Don't call or override this method. It is used for the implementation of 2495 * the view hierarchy. 2496 */ 2497 public final void invalidateChild(View child, final Rect dirty) { 2498 if (ViewDebug.TRACE_HIERARCHY) { 2499 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2500 } 2501 2502 ViewParent parent = this; 2503 2504 final AttachInfo attachInfo = mAttachInfo; 2505 if (attachInfo != null) { 2506 final int[] location = attachInfo.mInvalidateChildLocation; 2507 location[CHILD_LEFT_INDEX] = child.mLeft; 2508 location[CHILD_TOP_INDEX] = child.mTop; 2509 Matrix childMatrix = child.getMatrix(); 2510 if (!childMatrix.isIdentity()) { 2511 RectF boundingRect = attachInfo.mTmpTransformRect; 2512 boundingRect.set(dirty); 2513 childMatrix.mapRect(boundingRect); 2514 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2515 (int) (boundingRect.right + 0.5f), 2516 (int) (boundingRect.bottom + 0.5f)); 2517 } 2518 2519 // If the child is drawing an animation, we want to copy this flag onto 2520 // ourselves and the parent to make sure the invalidate request goes 2521 // through 2522 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2523 2524 // Check whether the child that requests the invalidate is fully opaque 2525 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2526 child.getAnimation() != null; 2527 // Mark the child as dirty, using the appropriate flag 2528 // Make sure we do not set both flags at the same time 2529 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2530 2531 do { 2532 View view = null; 2533 if (parent instanceof View) { 2534 view = (View) parent; 2535 } 2536 2537 if (drawAnimation) { 2538 if (view != null) { 2539 view.mPrivateFlags |= DRAW_ANIMATION; 2540 } else if (parent instanceof ViewRoot) { 2541 ((ViewRoot) parent).mIsAnimating = true; 2542 } 2543 } 2544 2545 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2546 // flag coming from the child that initiated the invalidate 2547 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2548 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2549 } 2550 2551 parent = parent.invalidateChildInParent(location, dirty); 2552 if (view != null) { 2553 // Account for transform on current parent 2554 Matrix m = view.getMatrix(); 2555 if (!m.isIdentity()) { 2556 RectF boundingRect = attachInfo.mTmpTransformRect; 2557 boundingRect.set(dirty); 2558 m.mapRect(boundingRect); 2559 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2560 (int) (boundingRect.right + 0.5f), 2561 (int) (boundingRect.bottom + 0.5f)); 2562 } 2563 } 2564 } while (parent != null); 2565 } 2566 } 2567 2568 /** 2569 * Don't call or override this method. It is used for the implementation of 2570 * the view hierarchy. 2571 * 2572 * This implementation returns null if this ViewGroup does not have a parent, 2573 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2574 * does not intersect with this ViewGroup's bounds. 2575 */ 2576 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2577 if (ViewDebug.TRACE_HIERARCHY) { 2578 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2579 } 2580 2581 if ((mPrivateFlags & DRAWN) == DRAWN) { 2582 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2583 FLAG_OPTIMIZE_INVALIDATE) { 2584 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2585 location[CHILD_TOP_INDEX] - mScrollY); 2586 2587 final int left = mLeft; 2588 final int top = mTop; 2589 2590 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2591 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2592 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2593 2594 location[CHILD_LEFT_INDEX] = left; 2595 location[CHILD_TOP_INDEX] = top; 2596 2597 return mParent; 2598 } 2599 } else { 2600 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2601 2602 location[CHILD_LEFT_INDEX] = mLeft; 2603 location[CHILD_TOP_INDEX] = mTop; 2604 2605 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2606 mBottom - location[CHILD_TOP_INDEX]); 2607 2608 return mParent; 2609 } 2610 } 2611 2612 return null; 2613 } 2614 2615 /** 2616 * Offset a rectangle that is in a descendant's coordinate 2617 * space into our coordinate space. 2618 * @param descendant A descendant of this view 2619 * @param rect A rectangle defined in descendant's coordinate space. 2620 */ 2621 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 2622 offsetRectBetweenParentAndChild(descendant, rect, true, false); 2623 } 2624 2625 /** 2626 * Offset a rectangle that is in our coordinate space into an ancestor's 2627 * coordinate space. 2628 * @param descendant A descendant of this view 2629 * @param rect A rectangle defined in descendant's coordinate space. 2630 */ 2631 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 2632 offsetRectBetweenParentAndChild(descendant, rect, false, false); 2633 } 2634 2635 /** 2636 * Helper method that offsets a rect either from parent to descendant or 2637 * descendant to parent. 2638 */ 2639 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 2640 boolean offsetFromChildToParent, boolean clipToBounds) { 2641 2642 // already in the same coord system :) 2643 if (descendant == this) { 2644 return; 2645 } 2646 2647 ViewParent theParent = descendant.mParent; 2648 2649 // search and offset up to the parent 2650 while ((theParent != null) 2651 && (theParent instanceof View) 2652 && (theParent != this)) { 2653 2654 if (offsetFromChildToParent) { 2655 rect.offset(descendant.mLeft - descendant.mScrollX, 2656 descendant.mTop - descendant.mScrollY); 2657 if (clipToBounds) { 2658 View p = (View) theParent; 2659 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2660 } 2661 } else { 2662 if (clipToBounds) { 2663 View p = (View) theParent; 2664 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2665 } 2666 rect.offset(descendant.mScrollX - descendant.mLeft, 2667 descendant.mScrollY - descendant.mTop); 2668 } 2669 2670 descendant = (View) theParent; 2671 theParent = descendant.mParent; 2672 } 2673 2674 // now that we are up to this view, need to offset one more time 2675 // to get into our coordinate space 2676 if (theParent == this) { 2677 if (offsetFromChildToParent) { 2678 rect.offset(descendant.mLeft - descendant.mScrollX, 2679 descendant.mTop - descendant.mScrollY); 2680 } else { 2681 rect.offset(descendant.mScrollX - descendant.mLeft, 2682 descendant.mScrollY - descendant.mTop); 2683 } 2684 } else { 2685 throw new IllegalArgumentException("parameter must be a descendant of this view"); 2686 } 2687 } 2688 2689 /** 2690 * Offset the vertical location of all children of this view by the specified number of pixels. 2691 * 2692 * @param offset the number of pixels to offset 2693 * 2694 * @hide 2695 */ 2696 public void offsetChildrenTopAndBottom(int offset) { 2697 final int count = mChildrenCount; 2698 final View[] children = mChildren; 2699 2700 for (int i = 0; i < count; i++) { 2701 final View v = children[i]; 2702 v.mTop += offset; 2703 v.mBottom += offset; 2704 } 2705 } 2706 2707 /** 2708 * {@inheritDoc} 2709 */ 2710 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 2711 int dx = child.mLeft - mScrollX; 2712 int dy = child.mTop - mScrollY; 2713 if (offset != null) { 2714 offset.x += dx; 2715 offset.y += dy; 2716 } 2717 r.offset(dx, dy); 2718 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 2719 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 2720 } 2721 2722 /** 2723 * {@inheritDoc} 2724 */ 2725 @Override 2726 protected abstract void onLayout(boolean changed, 2727 int l, int t, int r, int b); 2728 2729 /** 2730 * Indicates whether the view group has the ability to animate its children 2731 * after the first layout. 2732 * 2733 * @return true if the children can be animated, false otherwise 2734 */ 2735 protected boolean canAnimate() { 2736 return mLayoutAnimationController != null; 2737 } 2738 2739 /** 2740 * Runs the layout animation. Calling this method triggers a relayout of 2741 * this view group. 2742 */ 2743 public void startLayoutAnimation() { 2744 if (mLayoutAnimationController != null) { 2745 mGroupFlags |= FLAG_RUN_ANIMATION; 2746 requestLayout(); 2747 } 2748 } 2749 2750 /** 2751 * Schedules the layout animation to be played after the next layout pass 2752 * of this view group. This can be used to restart the layout animation 2753 * when the content of the view group changes or when the activity is 2754 * paused and resumed. 2755 */ 2756 public void scheduleLayoutAnimation() { 2757 mGroupFlags |= FLAG_RUN_ANIMATION; 2758 } 2759 2760 /** 2761 * Sets the layout animation controller used to animate the group's 2762 * children after the first layout. 2763 * 2764 * @param controller the animation controller 2765 */ 2766 public void setLayoutAnimation(LayoutAnimationController controller) { 2767 mLayoutAnimationController = controller; 2768 if (mLayoutAnimationController != null) { 2769 mGroupFlags |= FLAG_RUN_ANIMATION; 2770 } 2771 } 2772 2773 /** 2774 * Returns the layout animation controller used to animate the group's 2775 * children. 2776 * 2777 * @return the current animation controller 2778 */ 2779 public LayoutAnimationController getLayoutAnimation() { 2780 return mLayoutAnimationController; 2781 } 2782 2783 /** 2784 * Indicates whether the children's drawing cache is used during a layout 2785 * animation. By default, the drawing cache is enabled but this will prevent 2786 * nested layout animations from working. To nest animations, you must disable 2787 * the cache. 2788 * 2789 * @return true if the animation cache is enabled, false otherwise 2790 * 2791 * @see #setAnimationCacheEnabled(boolean) 2792 * @see View#setDrawingCacheEnabled(boolean) 2793 */ 2794 @ViewDebug.ExportedProperty 2795 public boolean isAnimationCacheEnabled() { 2796 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2797 } 2798 2799 /** 2800 * Enables or disables the children's drawing cache during a layout animation. 2801 * By default, the drawing cache is enabled but this will prevent nested 2802 * layout animations from working. To nest animations, you must disable the 2803 * cache. 2804 * 2805 * @param enabled true to enable the animation cache, false otherwise 2806 * 2807 * @see #isAnimationCacheEnabled() 2808 * @see View#setDrawingCacheEnabled(boolean) 2809 */ 2810 public void setAnimationCacheEnabled(boolean enabled) { 2811 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 2812 } 2813 2814 /** 2815 * Indicates whether this ViewGroup will always try to draw its children using their 2816 * drawing cache. By default this property is enabled. 2817 * 2818 * @return true if the animation cache is enabled, false otherwise 2819 * 2820 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2821 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2822 * @see View#setDrawingCacheEnabled(boolean) 2823 */ 2824 @ViewDebug.ExportedProperty 2825 public boolean isAlwaysDrawnWithCacheEnabled() { 2826 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 2827 } 2828 2829 /** 2830 * Indicates whether this ViewGroup will always try to draw its children using their 2831 * drawing cache. This property can be set to true when the cache rendering is 2832 * slightly different from the children's normal rendering. Renderings can be different, 2833 * for instance, when the cache's quality is set to low. 2834 * 2835 * When this property is disabled, the ViewGroup will use the drawing cache of its 2836 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 2837 * when to start using the drawing cache and when to stop using it. 2838 * 2839 * @param always true to always draw with the drawing cache, false otherwise 2840 * 2841 * @see #isAlwaysDrawnWithCacheEnabled() 2842 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2843 * @see View#setDrawingCacheEnabled(boolean) 2844 * @see View#setDrawingCacheQuality(int) 2845 */ 2846 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 2847 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 2848 } 2849 2850 /** 2851 * Indicates whether the ViewGroup is currently drawing its children using 2852 * their drawing cache. 2853 * 2854 * @return true if children should be drawn with their cache, false otherwise 2855 * 2856 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2857 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2858 */ 2859 @ViewDebug.ExportedProperty 2860 protected boolean isChildrenDrawnWithCacheEnabled() { 2861 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 2862 } 2863 2864 /** 2865 * Tells the ViewGroup to draw its children using their drawing cache. This property 2866 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 2867 * will be used only if it has been enabled. 2868 * 2869 * Subclasses should call this method to start and stop using the drawing cache when 2870 * they perform performance sensitive operations, like scrolling or animating. 2871 * 2872 * @param enabled true if children should be drawn with their cache, false otherwise 2873 * 2874 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2875 * @see #isChildrenDrawnWithCacheEnabled() 2876 */ 2877 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 2878 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 2879 } 2880 2881 /** 2882 * Indicates whether the ViewGroup is drawing its children in the order defined by 2883 * {@link #getChildDrawingOrder(int, int)}. 2884 * 2885 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 2886 * false otherwise 2887 * 2888 * @see #setChildrenDrawingOrderEnabled(boolean) 2889 * @see #getChildDrawingOrder(int, int) 2890 */ 2891 @ViewDebug.ExportedProperty 2892 protected boolean isChildrenDrawingOrderEnabled() { 2893 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 2894 } 2895 2896 /** 2897 * Tells the ViewGroup whether to draw its children in the order defined by the method 2898 * {@link #getChildDrawingOrder(int, int)}. 2899 * 2900 * @param enabled true if the order of the children when drawing is determined by 2901 * {@link #getChildDrawingOrder(int, int)}, false otherwise 2902 * 2903 * @see #isChildrenDrawingOrderEnabled() 2904 * @see #getChildDrawingOrder(int, int) 2905 */ 2906 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 2907 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 2908 } 2909 2910 private void setBooleanFlag(int flag, boolean value) { 2911 if (value) { 2912 mGroupFlags |= flag; 2913 } else { 2914 mGroupFlags &= ~flag; 2915 } 2916 } 2917 2918 /** 2919 * Returns an integer indicating what types of drawing caches are kept in memory. 2920 * 2921 * @see #setPersistentDrawingCache(int) 2922 * @see #setAnimationCacheEnabled(boolean) 2923 * 2924 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 2925 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2926 * and {@link #PERSISTENT_ALL_CACHES} 2927 */ 2928 @ViewDebug.ExportedProperty(mapping = { 2929 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 2930 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 2931 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 2932 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 2933 }) 2934 public int getPersistentDrawingCache() { 2935 return mPersistentDrawingCache; 2936 } 2937 2938 /** 2939 * Indicates what types of drawing caches should be kept in memory after 2940 * they have been created. 2941 * 2942 * @see #getPersistentDrawingCache() 2943 * @see #setAnimationCacheEnabled(boolean) 2944 * 2945 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 2946 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2947 * and {@link #PERSISTENT_ALL_CACHES} 2948 */ 2949 public void setPersistentDrawingCache(int drawingCacheToKeep) { 2950 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 2951 } 2952 2953 /** 2954 * Returns a new set of layout parameters based on the supplied attributes set. 2955 * 2956 * @param attrs the attributes to build the layout parameters from 2957 * 2958 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2959 * of its descendants 2960 */ 2961 public LayoutParams generateLayoutParams(AttributeSet attrs) { 2962 return new LayoutParams(getContext(), attrs); 2963 } 2964 2965 /** 2966 * Returns a safe set of layout parameters based on the supplied layout params. 2967 * When a ViewGroup is passed a View whose layout params do not pass the test of 2968 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 2969 * is invoked. This method should return a new set of layout params suitable for 2970 * this ViewGroup, possibly by copying the appropriate attributes from the 2971 * specified set of layout params. 2972 * 2973 * @param p The layout parameters to convert into a suitable set of layout parameters 2974 * for this ViewGroup. 2975 * 2976 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2977 * of its descendants 2978 */ 2979 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 2980 return p; 2981 } 2982 2983 /** 2984 * Returns a set of default layout parameters. These parameters are requested 2985 * when the View passed to {@link #addView(View)} has no layout parameters 2986 * already set. If null is returned, an exception is thrown from addView. 2987 * 2988 * @return a set of default layout parameters or null 2989 */ 2990 protected LayoutParams generateDefaultLayoutParams() { 2991 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 2992 } 2993 2994 /** 2995 * @hide 2996 */ 2997 @Override 2998 protected boolean dispatchConsistencyCheck(int consistency) { 2999 boolean result = super.dispatchConsistencyCheck(consistency); 3000 3001 final int count = mChildrenCount; 3002 final View[] children = mChildren; 3003 for (int i = 0; i < count; i++) { 3004 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3005 } 3006 3007 return result; 3008 } 3009 3010 /** 3011 * @hide 3012 */ 3013 @Override 3014 protected boolean onConsistencyCheck(int consistency) { 3015 boolean result = super.onConsistencyCheck(consistency); 3016 3017 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3018 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3019 3020 if (checkLayout) { 3021 final int count = mChildrenCount; 3022 final View[] children = mChildren; 3023 for (int i = 0; i < count; i++) { 3024 if (children[i].getParent() != this) { 3025 result = false; 3026 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3027 "View " + children[i] + " has no parent/a parent that is not " + this); 3028 } 3029 } 3030 } 3031 3032 if (checkDrawing) { 3033 // If this group is dirty, check that the parent is dirty as well 3034 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3035 final ViewParent parent = getParent(); 3036 if (parent != null && !(parent instanceof ViewRoot)) { 3037 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3038 result = false; 3039 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3040 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3041 } 3042 } 3043 } 3044 } 3045 3046 return result; 3047 } 3048 3049 /** 3050 * {@inheritDoc} 3051 */ 3052 @Override 3053 protected void debug(int depth) { 3054 super.debug(depth); 3055 String output; 3056 3057 if (mFocused != null) { 3058 output = debugIndent(depth); 3059 output += "mFocused"; 3060 Log.d(VIEW_LOG_TAG, output); 3061 } 3062 if (mChildrenCount != 0) { 3063 output = debugIndent(depth); 3064 output += "{"; 3065 Log.d(VIEW_LOG_TAG, output); 3066 } 3067 int count = mChildrenCount; 3068 for (int i = 0; i < count; i++) { 3069 View child = mChildren[i]; 3070 child.debug(depth + 1); 3071 } 3072 3073 if (mChildrenCount != 0) { 3074 output = debugIndent(depth); 3075 output += "}"; 3076 Log.d(VIEW_LOG_TAG, output); 3077 } 3078 } 3079 3080 /** 3081 * Returns the position in the group of the specified child view. 3082 * 3083 * @param child the view for which to get the position 3084 * @return a positive integer representing the position of the view in the 3085 * group, or -1 if the view does not exist in the group 3086 */ 3087 public int indexOfChild(View child) { 3088 final int count = mChildrenCount; 3089 final View[] children = mChildren; 3090 for (int i = 0; i < count; i++) { 3091 if (children[i] == child) { 3092 return i; 3093 } 3094 } 3095 return -1; 3096 } 3097 3098 /** 3099 * Returns the number of children in the group. 3100 * 3101 * @return a positive integer representing the number of children in 3102 * the group 3103 */ 3104 public int getChildCount() { 3105 return mChildrenCount; 3106 } 3107 3108 /** 3109 * Returns the view at the specified position in the group. 3110 * 3111 * @param index the position at which to get the view from 3112 * @return the view at the specified position or null if the position 3113 * does not exist within the group 3114 */ 3115 public View getChildAt(int index) { 3116 try { 3117 return mChildren[index]; 3118 } catch (IndexOutOfBoundsException ex) { 3119 return null; 3120 } 3121 } 3122 3123 /** 3124 * Ask all of the children of this view to measure themselves, taking into 3125 * account both the MeasureSpec requirements for this view and its padding. 3126 * We skip children that are in the GONE state The heavy lifting is done in 3127 * getChildMeasureSpec. 3128 * 3129 * @param widthMeasureSpec The width requirements for this view 3130 * @param heightMeasureSpec The height requirements for this view 3131 */ 3132 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3133 final int size = mChildrenCount; 3134 final View[] children = mChildren; 3135 for (int i = 0; i < size; ++i) { 3136 final View child = children[i]; 3137 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3138 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3139 } 3140 } 3141 } 3142 3143 /** 3144 * Ask one of the children of this view to measure itself, taking into 3145 * account both the MeasureSpec requirements for this view and its padding. 3146 * The heavy lifting is done in getChildMeasureSpec. 3147 * 3148 * @param child The child to measure 3149 * @param parentWidthMeasureSpec The width requirements for this view 3150 * @param parentHeightMeasureSpec The height requirements for this view 3151 */ 3152 protected void measureChild(View child, int parentWidthMeasureSpec, 3153 int parentHeightMeasureSpec) { 3154 final LayoutParams lp = child.getLayoutParams(); 3155 3156 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3157 mPaddingLeft + mPaddingRight, lp.width); 3158 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3159 mPaddingTop + mPaddingBottom, lp.height); 3160 3161 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3162 } 3163 3164 /** 3165 * Ask one of the children of this view to measure itself, taking into 3166 * account both the MeasureSpec requirements for this view and its padding 3167 * and margins. The child must have MarginLayoutParams The heavy lifting is 3168 * done in getChildMeasureSpec. 3169 * 3170 * @param child The child to measure 3171 * @param parentWidthMeasureSpec The width requirements for this view 3172 * @param widthUsed Extra space that has been used up by the parent 3173 * horizontally (possibly by other children of the parent) 3174 * @param parentHeightMeasureSpec The height requirements for this view 3175 * @param heightUsed Extra space that has been used up by the parent 3176 * vertically (possibly by other children of the parent) 3177 */ 3178 protected void measureChildWithMargins(View child, 3179 int parentWidthMeasureSpec, int widthUsed, 3180 int parentHeightMeasureSpec, int heightUsed) { 3181 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3182 3183 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3184 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3185 + widthUsed, lp.width); 3186 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3187 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3188 + heightUsed, lp.height); 3189 3190 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3191 } 3192 3193 /** 3194 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3195 * pass to a particular child. This method figures out the right MeasureSpec 3196 * for one dimension (height or width) of one child view. 3197 * 3198 * The goal is to combine information from our MeasureSpec with the 3199 * LayoutParams of the child to get the best possible results. For example, 3200 * if the this view knows its size (because its MeasureSpec has a mode of 3201 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3202 * to be the same size as the parent, the parent should ask the child to 3203 * layout given an exact size. 3204 * 3205 * @param spec The requirements for this view 3206 * @param padding The padding of this view for the current dimension and 3207 * margins, if applicable 3208 * @param childDimension How big the child wants to be in the current 3209 * dimension 3210 * @return a MeasureSpec integer for the child 3211 */ 3212 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3213 int specMode = MeasureSpec.getMode(spec); 3214 int specSize = MeasureSpec.getSize(spec); 3215 3216 int size = Math.max(0, specSize - padding); 3217 3218 int resultSize = 0; 3219 int resultMode = 0; 3220 3221 switch (specMode) { 3222 // Parent has imposed an exact size on us 3223 case MeasureSpec.EXACTLY: 3224 if (childDimension >= 0) { 3225 resultSize = childDimension; 3226 resultMode = MeasureSpec.EXACTLY; 3227 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3228 // Child wants to be our size. So be it. 3229 resultSize = size; 3230 resultMode = MeasureSpec.EXACTLY; 3231 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3232 // Child wants to determine its own size. It can't be 3233 // bigger than us. 3234 resultSize = size; 3235 resultMode = MeasureSpec.AT_MOST; 3236 } 3237 break; 3238 3239 // Parent has imposed a maximum size on us 3240 case MeasureSpec.AT_MOST: 3241 if (childDimension >= 0) { 3242 // Child wants a specific size... so be it 3243 resultSize = childDimension; 3244 resultMode = MeasureSpec.EXACTLY; 3245 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3246 // Child wants to be our size, but our size is not fixed. 3247 // Constrain child to not be bigger than us. 3248 resultSize = size; 3249 resultMode = MeasureSpec.AT_MOST; 3250 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3251 // Child wants to determine its own size. It can't be 3252 // bigger than us. 3253 resultSize = size; 3254 resultMode = MeasureSpec.AT_MOST; 3255 } 3256 break; 3257 3258 // Parent asked to see how big we want to be 3259 case MeasureSpec.UNSPECIFIED: 3260 if (childDimension >= 0) { 3261 // Child wants a specific size... let him have it 3262 resultSize = childDimension; 3263 resultMode = MeasureSpec.EXACTLY; 3264 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3265 // Child wants to be our size... find out how big it should 3266 // be 3267 resultSize = 0; 3268 resultMode = MeasureSpec.UNSPECIFIED; 3269 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3270 // Child wants to determine its own size.... find out how 3271 // big it should be 3272 resultSize = 0; 3273 resultMode = MeasureSpec.UNSPECIFIED; 3274 } 3275 break; 3276 } 3277 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3278 } 3279 3280 3281 /** 3282 * Removes any pending animations for views that have been removed. Call 3283 * this if you don't want animations for exiting views to stack up. 3284 */ 3285 public void clearDisappearingChildren() { 3286 if (mDisappearingChildren != null) { 3287 mDisappearingChildren.clear(); 3288 } 3289 } 3290 3291 /** 3292 * Add a view which is removed from mChildren but still needs animation 3293 * 3294 * @param v View to add 3295 */ 3296 private void addDisappearingView(View v) { 3297 ArrayList<View> disappearingChildren = mDisappearingChildren; 3298 3299 if (disappearingChildren == null) { 3300 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3301 } 3302 3303 disappearingChildren.add(v); 3304 } 3305 3306 /** 3307 * Cleanup a view when its animation is done. This may mean removing it from 3308 * the list of disappearing views. 3309 * 3310 * @param view The view whose animation has finished 3311 * @param animation The animation, cannot be null 3312 */ 3313 private void finishAnimatingView(final View view, Animation animation) { 3314 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3315 if (disappearingChildren != null) { 3316 if (disappearingChildren.contains(view)) { 3317 disappearingChildren.remove(view); 3318 3319 if (view.mAttachInfo != null) { 3320 view.dispatchDetachedFromWindow(); 3321 } 3322 3323 view.clearAnimation(); 3324 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3325 } 3326 } 3327 3328 if (animation != null && !animation.getFillAfter()) { 3329 view.clearAnimation(); 3330 } 3331 3332 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3333 view.onAnimationEnd(); 3334 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3335 // so we'd rather be safe than sorry 3336 view.mPrivateFlags &= ~ANIMATION_STARTED; 3337 // Draw one more frame after the animation is done 3338 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3339 } 3340 } 3341 3342 /** 3343 * {@inheritDoc} 3344 */ 3345 @Override 3346 public boolean gatherTransparentRegion(Region region) { 3347 // If no transparent regions requested, we are always opaque. 3348 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3349 if (meOpaque && region == null) { 3350 // The caller doesn't care about the region, so stop now. 3351 return true; 3352 } 3353 super.gatherTransparentRegion(region); 3354 final View[] children = mChildren; 3355 final int count = mChildrenCount; 3356 boolean noneOfTheChildrenAreTransparent = true; 3357 for (int i = 0; i < count; i++) { 3358 final View child = children[i]; 3359 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3360 if (!child.gatherTransparentRegion(region)) { 3361 noneOfTheChildrenAreTransparent = false; 3362 } 3363 } 3364 } 3365 return meOpaque || noneOfTheChildrenAreTransparent; 3366 } 3367 3368 /** 3369 * {@inheritDoc} 3370 */ 3371 public void requestTransparentRegion(View child) { 3372 if (child != null) { 3373 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3374 if (mParent != null) { 3375 mParent.requestTransparentRegion(this); 3376 } 3377 } 3378 } 3379 3380 3381 @Override 3382 protected boolean fitSystemWindows(Rect insets) { 3383 boolean done = super.fitSystemWindows(insets); 3384 if (!done) { 3385 final int count = mChildrenCount; 3386 final View[] children = mChildren; 3387 for (int i = 0; i < count; i++) { 3388 done = children[i].fitSystemWindows(insets); 3389 if (done) { 3390 break; 3391 } 3392 } 3393 } 3394 return done; 3395 } 3396 3397 /** 3398 * Returns the animation listener to which layout animation events are 3399 * sent. 3400 * 3401 * @return an {@link android.view.animation.Animation.AnimationListener} 3402 */ 3403 public Animation.AnimationListener getLayoutAnimationListener() { 3404 return mAnimationListener; 3405 } 3406 3407 @Override 3408 protected void drawableStateChanged() { 3409 super.drawableStateChanged(); 3410 3411 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3412 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3413 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3414 + " child has duplicateParentState set to true"); 3415 } 3416 3417 final View[] children = mChildren; 3418 final int count = mChildrenCount; 3419 3420 for (int i = 0; i < count; i++) { 3421 final View child = children[i]; 3422 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3423 child.refreshDrawableState(); 3424 } 3425 } 3426 } 3427 } 3428 3429 @Override 3430 protected int[] onCreateDrawableState(int extraSpace) { 3431 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3432 return super.onCreateDrawableState(extraSpace); 3433 } 3434 3435 int need = 0; 3436 int n = getChildCount(); 3437 for (int i = 0; i < n; i++) { 3438 int[] childState = getChildAt(i).getDrawableState(); 3439 3440 if (childState != null) { 3441 need += childState.length; 3442 } 3443 } 3444 3445 int[] state = super.onCreateDrawableState(extraSpace + need); 3446 3447 for (int i = 0; i < n; i++) { 3448 int[] childState = getChildAt(i).getDrawableState(); 3449 3450 if (childState != null) { 3451 state = mergeDrawableStates(state, childState); 3452 } 3453 } 3454 3455 return state; 3456 } 3457 3458 /** 3459 * Sets whether this ViewGroup's drawable states also include 3460 * its children's drawable states. This is used, for example, to 3461 * make a group appear to be focused when its child EditText or button 3462 * is focused. 3463 */ 3464 public void setAddStatesFromChildren(boolean addsStates) { 3465 if (addsStates) { 3466 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3467 } else { 3468 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3469 } 3470 3471 refreshDrawableState(); 3472 } 3473 3474 /** 3475 * Returns whether this ViewGroup's drawable states also include 3476 * its children's drawable states. This is used, for example, to 3477 * make a group appear to be focused when its child EditText or button 3478 * is focused. 3479 */ 3480 public boolean addStatesFromChildren() { 3481 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3482 } 3483 3484 /** 3485 * If {link #addStatesFromChildren} is true, refreshes this group's 3486 * drawable state (to include the states from its children). 3487 */ 3488 public void childDrawableStateChanged(View child) { 3489 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3490 refreshDrawableState(); 3491 } 3492 } 3493 3494 /** 3495 * Specifies the animation listener to which layout animation events must 3496 * be sent. Only 3497 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3498 * and 3499 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3500 * are invoked. 3501 * 3502 * @param animationListener the layout animation listener 3503 */ 3504 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3505 mAnimationListener = animationListener; 3506 } 3507 3508 /** 3509 * LayoutParams are used by views to tell their parents how they want to be 3510 * laid out. See 3511 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3512 * for a list of all child view attributes that this class supports. 3513 * 3514 * <p> 3515 * The base LayoutParams class just describes how big the view wants to be 3516 * for both width and height. For each dimension, it can specify one of: 3517 * <ul> 3518 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 3519 * means that the view wants to be as big as its parent (minus padding) 3520 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3521 * to enclose its content (plus padding) 3522 * <li> an exact number 3523 * </ul> 3524 * There are subclasses of LayoutParams for different subclasses of 3525 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3526 * LayoutParams which adds an X and Y value. 3527 * 3528 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3529 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3530 */ 3531 public static class LayoutParams { 3532 /** 3533 * Special value for the height or width requested by a View. 3534 * FILL_PARENT means that the view wants to be as big as its parent, 3535 * minus the parent's padding, if any. This value is deprecated 3536 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 3537 */ 3538 @SuppressWarnings({"UnusedDeclaration"}) 3539 @Deprecated 3540 public static final int FILL_PARENT = -1; 3541 3542 /** 3543 * Special value for the height or width requested by a View. 3544 * MATCH_PARENT means that the view wants to be as big as its parent, 3545 * minus the parent's padding, if any. Introduced in API Level 8. 3546 */ 3547 public static final int MATCH_PARENT = -1; 3548 3549 /** 3550 * Special value for the height or width requested by a View. 3551 * WRAP_CONTENT means that the view wants to be just large enough to fit 3552 * its own internal content, taking its own padding into account. 3553 */ 3554 public static final int WRAP_CONTENT = -2; 3555 3556 /** 3557 * Information about how wide the view wants to be. Can be one of the 3558 * constants FILL_PARENT (replaced by MATCH_PARENT , 3559 * in API Level 8) or WRAP_CONTENT. or an exact size. 3560 */ 3561 @ViewDebug.ExportedProperty(mapping = { 3562 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3563 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3564 }) 3565 public int width; 3566 3567 /** 3568 * Information about how tall the view wants to be. Can be one of the 3569 * constants FILL_PARENT (replaced by MATCH_PARENT , 3570 * in API Level 8) or WRAP_CONTENT. or an exact size. 3571 */ 3572 @ViewDebug.ExportedProperty(mapping = { 3573 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3574 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3575 }) 3576 public int height; 3577 3578 /** 3579 * Used to animate layouts. 3580 */ 3581 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 3582 3583 /** 3584 * Creates a new set of layout parameters. The values are extracted from 3585 * the supplied attributes set and context. The XML attributes mapped 3586 * to this set of layout parameters are: 3587 * 3588 * <ul> 3589 * <li><code>layout_width</code>: the width, either an exact value, 3590 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3591 * {@link #MATCH_PARENT} in API Level 8)</li> 3592 * <li><code>layout_height</code>: the height, either an exact value, 3593 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3594 * {@link #MATCH_PARENT} in API Level 8)</li> 3595 * </ul> 3596 * 3597 * @param c the application environment 3598 * @param attrs the set of attributes from which to extract the layout 3599 * parameters' values 3600 */ 3601 public LayoutParams(Context c, AttributeSet attrs) { 3602 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 3603 setBaseAttributes(a, 3604 R.styleable.ViewGroup_Layout_layout_width, 3605 R.styleable.ViewGroup_Layout_layout_height); 3606 a.recycle(); 3607 } 3608 3609 /** 3610 * Creates a new set of layout parameters with the specified width 3611 * and height. 3612 * 3613 * @param width the width, either {@link #WRAP_CONTENT}, 3614 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3615 * API Level 8), or a fixed size in pixels 3616 * @param height the height, either {@link #WRAP_CONTENT}, 3617 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3618 * API Level 8), or a fixed size in pixels 3619 */ 3620 public LayoutParams(int width, int height) { 3621 this.width = width; 3622 this.height = height; 3623 } 3624 3625 /** 3626 * Copy constructor. Clones the width and height values of the source. 3627 * 3628 * @param source The layout params to copy from. 3629 */ 3630 public LayoutParams(LayoutParams source) { 3631 this.width = source.width; 3632 this.height = source.height; 3633 } 3634 3635 /** 3636 * Used internally by MarginLayoutParams. 3637 * @hide 3638 */ 3639 LayoutParams() { 3640 } 3641 3642 /** 3643 * Extracts the layout parameters from the supplied attributes. 3644 * 3645 * @param a the style attributes to extract the parameters from 3646 * @param widthAttr the identifier of the width attribute 3647 * @param heightAttr the identifier of the height attribute 3648 */ 3649 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 3650 width = a.getLayoutDimension(widthAttr, "layout_width"); 3651 height = a.getLayoutDimension(heightAttr, "layout_height"); 3652 } 3653 3654 /** 3655 * Returns a String representation of this set of layout parameters. 3656 * 3657 * @param output the String to prepend to the internal representation 3658 * @return a String with the following format: output + 3659 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 3660 * 3661 * @hide 3662 */ 3663 public String debug(String output) { 3664 return output + "ViewGroup.LayoutParams={ width=" 3665 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 3666 } 3667 3668 /** 3669 * Converts the specified size to a readable String. 3670 * 3671 * @param size the size to convert 3672 * @return a String instance representing the supplied size 3673 * 3674 * @hide 3675 */ 3676 protected static String sizeToString(int size) { 3677 if (size == WRAP_CONTENT) { 3678 return "wrap-content"; 3679 } 3680 if (size == MATCH_PARENT) { 3681 return "match-parent"; 3682 } 3683 return String.valueOf(size); 3684 } 3685 } 3686 3687 /** 3688 * Per-child layout information for layouts that support margins. 3689 * See 3690 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 3691 * for a list of all child view attributes that this class supports. 3692 */ 3693 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 3694 /** 3695 * The left margin in pixels of the child. 3696 */ 3697 @ViewDebug.ExportedProperty 3698 public int leftMargin; 3699 3700 /** 3701 * The top margin in pixels of the child. 3702 */ 3703 @ViewDebug.ExportedProperty 3704 public int topMargin; 3705 3706 /** 3707 * The right margin in pixels of the child. 3708 */ 3709 @ViewDebug.ExportedProperty 3710 public int rightMargin; 3711 3712 /** 3713 * The bottom margin in pixels of the child. 3714 */ 3715 @ViewDebug.ExportedProperty 3716 public int bottomMargin; 3717 3718 /** 3719 * Creates a new set of layout parameters. The values are extracted from 3720 * the supplied attributes set and context. 3721 * 3722 * @param c the application environment 3723 * @param attrs the set of attributes from which to extract the layout 3724 * parameters' values 3725 */ 3726 public MarginLayoutParams(Context c, AttributeSet attrs) { 3727 super(); 3728 3729 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 3730 setBaseAttributes(a, 3731 R.styleable.ViewGroup_MarginLayout_layout_width, 3732 R.styleable.ViewGroup_MarginLayout_layout_height); 3733 3734 int margin = a.getDimensionPixelSize( 3735 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 3736 if (margin >= 0) { 3737 leftMargin = margin; 3738 topMargin = margin; 3739 rightMargin= margin; 3740 bottomMargin = margin; 3741 } else { 3742 leftMargin = a.getDimensionPixelSize( 3743 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 3744 topMargin = a.getDimensionPixelSize( 3745 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 3746 rightMargin = a.getDimensionPixelSize( 3747 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 3748 bottomMargin = a.getDimensionPixelSize( 3749 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 3750 } 3751 3752 a.recycle(); 3753 } 3754 3755 /** 3756 * {@inheritDoc} 3757 */ 3758 public MarginLayoutParams(int width, int height) { 3759 super(width, height); 3760 } 3761 3762 /** 3763 * Copy constructor. Clones the width, height and margin values of the source. 3764 * 3765 * @param source The layout params to copy from. 3766 */ 3767 public MarginLayoutParams(MarginLayoutParams source) { 3768 this.width = source.width; 3769 this.height = source.height; 3770 3771 this.leftMargin = source.leftMargin; 3772 this.topMargin = source.topMargin; 3773 this.rightMargin = source.rightMargin; 3774 this.bottomMargin = source.bottomMargin; 3775 } 3776 3777 /** 3778 * {@inheritDoc} 3779 */ 3780 public MarginLayoutParams(LayoutParams source) { 3781 super(source); 3782 } 3783 3784 /** 3785 * Sets the margins, in pixels. 3786 * 3787 * @param left the left margin size 3788 * @param top the top margin size 3789 * @param right the right margin size 3790 * @param bottom the bottom margin size 3791 * 3792 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 3793 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 3794 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 3795 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 3796 */ 3797 public void setMargins(int left, int top, int right, int bottom) { 3798 leftMargin = left; 3799 topMargin = top; 3800 rightMargin = right; 3801 bottomMargin = bottom; 3802 } 3803 } 3804} 3805