ViewGroup.java revision 5429e1d1026db8922478b715672e6c0703bbf4a9
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import com.android.internal.R; 21 22import android.content.Context; 23import android.content.res.Configuration; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Canvas; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.Rect; 30import android.graphics.RectF; 31import android.graphics.Region; 32import android.os.Parcelable; 33import android.os.SystemClock; 34import android.util.AttributeSet; 35import android.util.Log; 36import android.util.SparseArray; 37import android.view.accessibility.AccessibilityEvent; 38import android.view.animation.Animation; 39import android.view.animation.AnimationUtils; 40import android.view.animation.LayoutAnimationController; 41import android.view.animation.Transformation; 42 43import java.util.ArrayList; 44 45/** 46 * <p> 47 * A <code>ViewGroup</code> is a special view that can contain other views 48 * (called children.) The view group is the base class for layouts and views 49 * containers. This class also defines the 50 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 51 * class for layouts parameters. 52 * </p> 53 * 54 * <p> 55 * Also see {@link LayoutParams} for layout attributes. 56 * </p> 57 * 58 * @attr ref android.R.styleable#ViewGroup_clipChildren 59 * @attr ref android.R.styleable#ViewGroup_clipToPadding 60 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 61 * @attr ref android.R.styleable#ViewGroup_animationCache 62 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 63 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 64 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 65 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 66 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 67 */ 68public abstract class ViewGroup extends View implements ViewParent, ViewManager { 69 70 private static final boolean DBG = false; 71 72 /** 73 * Views which have been hidden or removed which need to be animated on 74 * their way out. 75 * This field should be made private, so it is hidden from the SDK. 76 * {@hide} 77 */ 78 protected ArrayList<View> mDisappearingChildren; 79 80 /** 81 * Listener used to propagate events indicating when children are added 82 * and/or removed from a view group. 83 * This field should be made private, so it is hidden from the SDK. 84 * {@hide} 85 */ 86 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 87 88 // The view contained within this ViewGroup that has or contains focus. 89 private View mFocused; 90 91 /** 92 * A Transformation used when drawing children, to 93 * apply on the child being drawn. 94 */ 95 private final Transformation mChildTransformation = new Transformation(); 96 97 /** 98 * Used to track the current invalidation region. 99 */ 100 private RectF mInvalidateRegion; 101 102 /** 103 * A Transformation used to calculate a correct 104 * invalidation area when the application is autoscaled. 105 */ 106 private Transformation mInvalidationTransformation; 107 108 // Target of Motion events 109 private View mMotionTarget; 110 111 // Targets of MotionEvents in split mode 112 private SplitMotionTargets mSplitMotionTargets; 113 114 // Layout animation 115 private LayoutAnimationController mLayoutAnimationController; 116 private Animation.AnimationListener mAnimationListener; 117 118 /** 119 * Internal flags. 120 * 121 * This field should be made private, so it is hidden from the SDK. 122 * {@hide} 123 */ 124 protected int mGroupFlags; 125 126 // When set, ViewGroup invalidates only the child's rectangle 127 // Set by default 128 private static final int FLAG_CLIP_CHILDREN = 0x1; 129 130 // When set, ViewGroup excludes the padding area from the invalidate rectangle 131 // Set by default 132 private static final int FLAG_CLIP_TO_PADDING = 0x2; 133 134 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 135 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 136 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 137 138 // When set, dispatchDraw() will run the layout animation and unset the flag 139 private static final int FLAG_RUN_ANIMATION = 0x8; 140 141 // When set, there is either no layout animation on the ViewGroup or the layout 142 // animation is over 143 // Set by default 144 private static final int FLAG_ANIMATION_DONE = 0x10; 145 146 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 147 // to clip it, even if FLAG_CLIP_TO_PADDING is set 148 private static final int FLAG_PADDING_NOT_NULL = 0x20; 149 150 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 151 // Set by default 152 private static final int FLAG_ANIMATION_CACHE = 0x40; 153 154 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 155 // layout animation; this avoid clobbering the hierarchy 156 // Automatically set when the layout animation starts, depending on the animation's 157 // characteristics 158 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 159 160 // When set, the next call to drawChild() will clear mChildTransformation's matrix 161 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 162 163 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 164 // the children's Bitmap caches if necessary 165 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 166 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 167 168 /** 169 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 170 * to get the index of the child to draw for that iteration. 171 * 172 * @hide 173 */ 174 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 175 176 /** 177 * When set, this ViewGroup supports static transformations on children; this causes 178 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 179 * invoked when a child is drawn. 180 * 181 * Any subclass overriding 182 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 183 * set this flags in {@link #mGroupFlags}. 184 * 185 * {@hide} 186 */ 187 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 188 189 // When the previous drawChild() invocation used an alpha value that was lower than 190 // 1.0 and set it in mCachePaint 191 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 192 193 /** 194 * When set, this ViewGroup's drawable states also include those 195 * of its children. 196 */ 197 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 198 199 /** 200 * When set, this ViewGroup tries to always draw its children using their drawing cache. 201 */ 202 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 203 204 /** 205 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 206 * draw its children with their drawing cache. 207 */ 208 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 209 210 /** 211 * When set, this group will go through its list of children to notify them of 212 * any drawable state change. 213 */ 214 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 215 216 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 217 218 /** 219 * This view will get focus before any of its descendants. 220 */ 221 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 222 223 /** 224 * This view will get focus only if none of its descendants want it. 225 */ 226 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 227 228 /** 229 * This view will block any of its descendants from getting focus, even 230 * if they are focusable. 231 */ 232 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 233 234 /** 235 * Used to map between enum in attrubutes and flag values. 236 */ 237 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 238 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 239 FOCUS_BLOCK_DESCENDANTS}; 240 241 /** 242 * When set, this ViewGroup should not intercept touch events. 243 * {@hide} 244 */ 245 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 246 247 /** 248 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 249 */ 250 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x100000; 251 252 /** 253 * Indicates which types of drawing caches are to be kept in memory. 254 * This field should be made private, so it is hidden from the SDK. 255 * {@hide} 256 */ 257 protected int mPersistentDrawingCache; 258 259 /** 260 * Used to indicate that no drawing cache should be kept in memory. 261 */ 262 public static final int PERSISTENT_NO_CACHE = 0x0; 263 264 /** 265 * Used to indicate that the animation drawing cache should be kept in memory. 266 */ 267 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 268 269 /** 270 * Used to indicate that the scrolling drawing cache should be kept in memory. 271 */ 272 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 273 274 /** 275 * Used to indicate that all drawing caches should be kept in memory. 276 */ 277 public static final int PERSISTENT_ALL_CACHES = 0x3; 278 279 /** 280 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 281 * are set at the same time. 282 */ 283 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 284 285 // Index of the child's left position in the mLocation array 286 private static final int CHILD_LEFT_INDEX = 0; 287 // Index of the child's top position in the mLocation array 288 private static final int CHILD_TOP_INDEX = 1; 289 290 // Child views of this ViewGroup 291 private View[] mChildren; 292 // Number of valid children in the mChildren array, the rest should be null or not 293 // considered as children 294 private int mChildrenCount; 295 296 private static final int ARRAY_INITIAL_CAPACITY = 12; 297 private static final int ARRAY_CAPACITY_INCREMENT = 12; 298 299 // Used to draw cached views 300 private final Paint mCachePaint = new Paint(); 301 302 // Used to animate add/remove changes in layout 303 private LayoutTransition mTransition; 304 305 // The set of views that are currently being transitioned. This list is used to track views 306 // being removed that should not actually be removed from the parent yet because they are 307 // being animated. 308 private ArrayList<View> mTransitioningViews; 309 310 public ViewGroup(Context context) { 311 super(context); 312 initViewGroup(); 313 } 314 315 public ViewGroup(Context context, AttributeSet attrs) { 316 super(context, attrs); 317 initViewGroup(); 318 initFromAttributes(context, attrs); 319 } 320 321 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 322 super(context, attrs, defStyle); 323 initViewGroup(); 324 initFromAttributes(context, attrs); 325 } 326 327 private void initViewGroup() { 328 // ViewGroup doesn't draw by default 329 setFlags(WILL_NOT_DRAW, DRAW_MASK); 330 mGroupFlags |= FLAG_CLIP_CHILDREN; 331 mGroupFlags |= FLAG_CLIP_TO_PADDING; 332 mGroupFlags |= FLAG_ANIMATION_DONE; 333 mGroupFlags |= FLAG_ANIMATION_CACHE; 334 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 335 336 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 337 338 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 339 mChildrenCount = 0; 340 341 mCachePaint.setDither(false); 342 343 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 344 } 345 346 private void initFromAttributes(Context context, AttributeSet attrs) { 347 TypedArray a = context.obtainStyledAttributes(attrs, 348 R.styleable.ViewGroup); 349 350 final int N = a.getIndexCount(); 351 for (int i = 0; i < N; i++) { 352 int attr = a.getIndex(i); 353 switch (attr) { 354 case R.styleable.ViewGroup_clipChildren: 355 setClipChildren(a.getBoolean(attr, true)); 356 break; 357 case R.styleable.ViewGroup_clipToPadding: 358 setClipToPadding(a.getBoolean(attr, true)); 359 break; 360 case R.styleable.ViewGroup_animationCache: 361 setAnimationCacheEnabled(a.getBoolean(attr, true)); 362 break; 363 case R.styleable.ViewGroup_persistentDrawingCache: 364 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 365 break; 366 case R.styleable.ViewGroup_addStatesFromChildren: 367 setAddStatesFromChildren(a.getBoolean(attr, false)); 368 break; 369 case R.styleable.ViewGroup_alwaysDrawnWithCache: 370 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 371 break; 372 case R.styleable.ViewGroup_layoutAnimation: 373 int id = a.getResourceId(attr, -1); 374 if (id > 0) { 375 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 376 } 377 break; 378 case R.styleable.ViewGroup_descendantFocusability: 379 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 380 break; 381 case R.styleable.ViewGroup_splitMotionEvents: 382 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 383 break; 384 case R.styleable.ViewGroup_animateLayoutChanges: 385 boolean animateLayoutChanges = a.getBoolean(attr, false); 386 if (animateLayoutChanges) { 387 setLayoutTransition(new LayoutTransition()); 388 } 389 break; 390 } 391 } 392 393 a.recycle(); 394 } 395 396 /** 397 * Gets the descendant focusability of this view group. The descendant 398 * focusability defines the relationship between this view group and its 399 * descendants when looking for a view to take focus in 400 * {@link #requestFocus(int, android.graphics.Rect)}. 401 * 402 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 403 * {@link #FOCUS_BLOCK_DESCENDANTS}. 404 */ 405 @ViewDebug.ExportedProperty(category = "focus", mapping = { 406 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 407 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 408 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 409 }) 410 public int getDescendantFocusability() { 411 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 412 } 413 414 /** 415 * Set the descendant focusability of this view group. This defines the relationship 416 * between this view group and its descendants when looking for a view to 417 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 418 * 419 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 420 * {@link #FOCUS_BLOCK_DESCENDANTS}. 421 */ 422 public void setDescendantFocusability(int focusability) { 423 switch (focusability) { 424 case FOCUS_BEFORE_DESCENDANTS: 425 case FOCUS_AFTER_DESCENDANTS: 426 case FOCUS_BLOCK_DESCENDANTS: 427 break; 428 default: 429 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 430 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 431 } 432 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 433 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 434 } 435 436 /** 437 * {@inheritDoc} 438 */ 439 @Override 440 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 441 if (mFocused != null) { 442 mFocused.unFocus(); 443 mFocused = null; 444 } 445 super.handleFocusGainInternal(direction, previouslyFocusedRect); 446 } 447 448 /** 449 * {@inheritDoc} 450 */ 451 public void requestChildFocus(View child, View focused) { 452 if (DBG) { 453 System.out.println(this + " requestChildFocus()"); 454 } 455 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 456 return; 457 } 458 459 // Unfocus us, if necessary 460 super.unFocus(); 461 462 // We had a previous notion of who had focus. Clear it. 463 if (mFocused != child) { 464 if (mFocused != null) { 465 mFocused.unFocus(); 466 } 467 468 mFocused = child; 469 } 470 if (mParent != null) { 471 mParent.requestChildFocus(this, focused); 472 } 473 } 474 475 /** 476 * {@inheritDoc} 477 */ 478 public void focusableViewAvailable(View v) { 479 if (mParent != null 480 // shortcut: don't report a new focusable view if we block our descendants from 481 // getting focus 482 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 483 // shortcut: don't report a new focusable view if we already are focused 484 // (and we don't prefer our descendants) 485 // 486 // note: knowing that mFocused is non-null is not a good enough reason 487 // to break the traversal since in that case we'd actually have to find 488 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 489 // an ancestor of v; this will get checked for at ViewRoot 490 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 491 mParent.focusableViewAvailable(v); 492 } 493 } 494 495 /** 496 * {@inheritDoc} 497 */ 498 public boolean showContextMenuForChild(View originalView) { 499 return mParent != null && mParent.showContextMenuForChild(originalView); 500 } 501 502 /** 503 * {@inheritDoc} 504 */ 505 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 506 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 507 } 508 509 /** 510 * Find the nearest view in the specified direction that wants to take 511 * focus. 512 * 513 * @param focused The view that currently has focus 514 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 515 * FOCUS_RIGHT, or 0 for not applicable. 516 */ 517 public View focusSearch(View focused, int direction) { 518 if (isRootNamespace()) { 519 // root namespace means we should consider ourselves the top of the 520 // tree for focus searching; otherwise we could be focus searching 521 // into other tabs. see LocalActivityManager and TabHost for more info 522 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 523 } else if (mParent != null) { 524 return mParent.focusSearch(focused, direction); 525 } 526 return null; 527 } 528 529 /** 530 * {@inheritDoc} 531 */ 532 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 533 return false; 534 } 535 536 /** 537 * {@inheritDoc} 538 */ 539 @Override 540 public boolean dispatchUnhandledMove(View focused, int direction) { 541 return mFocused != null && 542 mFocused.dispatchUnhandledMove(focused, direction); 543 } 544 545 /** 546 * {@inheritDoc} 547 */ 548 public void clearChildFocus(View child) { 549 if (DBG) { 550 System.out.println(this + " clearChildFocus()"); 551 } 552 553 mFocused = null; 554 if (mParent != null) { 555 mParent.clearChildFocus(this); 556 } 557 } 558 559 /** 560 * {@inheritDoc} 561 */ 562 @Override 563 public void clearFocus() { 564 super.clearFocus(); 565 566 // clear any child focus if it exists 567 if (mFocused != null) { 568 mFocused.clearFocus(); 569 } 570 } 571 572 /** 573 * {@inheritDoc} 574 */ 575 @Override 576 void unFocus() { 577 if (DBG) { 578 System.out.println(this + " unFocus()"); 579 } 580 581 super.unFocus(); 582 if (mFocused != null) { 583 mFocused.unFocus(); 584 } 585 mFocused = null; 586 } 587 588 /** 589 * Returns the focused child of this view, if any. The child may have focus 590 * or contain focus. 591 * 592 * @return the focused child or null. 593 */ 594 public View getFocusedChild() { 595 return mFocused; 596 } 597 598 /** 599 * Returns true if this view has or contains focus 600 * 601 * @return true if this view has or contains focus 602 */ 603 @Override 604 public boolean hasFocus() { 605 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 606 } 607 608 /* 609 * (non-Javadoc) 610 * 611 * @see android.view.View#findFocus() 612 */ 613 @Override 614 public View findFocus() { 615 if (DBG) { 616 System.out.println("Find focus in " + this + ": flags=" 617 + isFocused() + ", child=" + mFocused); 618 } 619 620 if (isFocused()) { 621 return this; 622 } 623 624 if (mFocused != null) { 625 return mFocused.findFocus(); 626 } 627 return null; 628 } 629 630 /** 631 * {@inheritDoc} 632 */ 633 @Override 634 public boolean hasFocusable() { 635 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 636 return false; 637 } 638 639 if (isFocusable()) { 640 return true; 641 } 642 643 final int descendantFocusability = getDescendantFocusability(); 644 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 645 final int count = mChildrenCount; 646 final View[] children = mChildren; 647 648 for (int i = 0; i < count; i++) { 649 final View child = children[i]; 650 if (child.hasFocusable()) { 651 return true; 652 } 653 } 654 } 655 656 return false; 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 @Override 663 public void addFocusables(ArrayList<View> views, int direction) { 664 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 665 } 666 667 /** 668 * {@inheritDoc} 669 */ 670 @Override 671 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 672 final int focusableCount = views.size(); 673 674 final int descendantFocusability = getDescendantFocusability(); 675 676 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 677 final int count = mChildrenCount; 678 final View[] children = mChildren; 679 680 for (int i = 0; i < count; i++) { 681 final View child = children[i]; 682 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 683 child.addFocusables(views, direction, focusableMode); 684 } 685 } 686 } 687 688 // we add ourselves (if focusable) in all cases except for when we are 689 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 690 // to avoid the focus search finding layouts when a more precise search 691 // among the focusable children would be more interesting. 692 if ( 693 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 694 // No focusable descendants 695 (focusableCount == views.size())) { 696 super.addFocusables(views, direction, focusableMode); 697 } 698 } 699 700 /** 701 * {@inheritDoc} 702 */ 703 @Override 704 public void dispatchWindowFocusChanged(boolean hasFocus) { 705 super.dispatchWindowFocusChanged(hasFocus); 706 final int count = mChildrenCount; 707 final View[] children = mChildren; 708 for (int i = 0; i < count; i++) { 709 children[i].dispatchWindowFocusChanged(hasFocus); 710 } 711 } 712 713 /** 714 * {@inheritDoc} 715 */ 716 @Override 717 public void addTouchables(ArrayList<View> views) { 718 super.addTouchables(views); 719 720 final int count = mChildrenCount; 721 final View[] children = mChildren; 722 723 for (int i = 0; i < count; i++) { 724 final View child = children[i]; 725 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 726 child.addTouchables(views); 727 } 728 } 729 } 730 731 /** 732 * {@inheritDoc} 733 */ 734 @Override 735 public void dispatchDisplayHint(int hint) { 736 super.dispatchDisplayHint(hint); 737 final int count = mChildrenCount; 738 final View[] children = mChildren; 739 for (int i = 0; i < count; i++) { 740 children[i].dispatchDisplayHint(hint); 741 } 742 } 743 744 /** 745 * {@inheritDoc} 746 */ 747 @Override 748 protected void dispatchVisibilityChanged(View changedView, int visibility) { 749 super.dispatchVisibilityChanged(changedView, visibility); 750 final int count = mChildrenCount; 751 final View[] children = mChildren; 752 for (int i = 0; i < count; i++) { 753 children[i].dispatchVisibilityChanged(changedView, visibility); 754 } 755 } 756 757 /** 758 * {@inheritDoc} 759 */ 760 @Override 761 public void dispatchWindowVisibilityChanged(int visibility) { 762 super.dispatchWindowVisibilityChanged(visibility); 763 final int count = mChildrenCount; 764 final View[] children = mChildren; 765 for (int i = 0; i < count; i++) { 766 children[i].dispatchWindowVisibilityChanged(visibility); 767 } 768 } 769 770 /** 771 * {@inheritDoc} 772 */ 773 @Override 774 public void dispatchConfigurationChanged(Configuration newConfig) { 775 super.dispatchConfigurationChanged(newConfig); 776 final int count = mChildrenCount; 777 final View[] children = mChildren; 778 for (int i = 0; i < count; i++) { 779 children[i].dispatchConfigurationChanged(newConfig); 780 } 781 } 782 783 /** 784 * {@inheritDoc} 785 */ 786 public void recomputeViewAttributes(View child) { 787 ViewParent parent = mParent; 788 if (parent != null) parent.recomputeViewAttributes(this); 789 } 790 791 @Override 792 void dispatchCollectViewAttributes(int visibility) { 793 visibility |= mViewFlags&VISIBILITY_MASK; 794 super.dispatchCollectViewAttributes(visibility); 795 final int count = mChildrenCount; 796 final View[] children = mChildren; 797 for (int i = 0; i < count; i++) { 798 children[i].dispatchCollectViewAttributes(visibility); 799 } 800 } 801 802 /** 803 * {@inheritDoc} 804 */ 805 public void bringChildToFront(View child) { 806 int index = indexOfChild(child); 807 if (index >= 0) { 808 removeFromArray(index); 809 addInArray(child, mChildrenCount); 810 child.mParent = this; 811 } 812 } 813 814 /** 815 * {@inheritDoc} 816 */ 817 @Override 818 public boolean dispatchKeyEventPreIme(KeyEvent event) { 819 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 820 return super.dispatchKeyEventPreIme(event); 821 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 822 return mFocused.dispatchKeyEventPreIme(event); 823 } 824 return false; 825 } 826 827 /** 828 * {@inheritDoc} 829 */ 830 @Override 831 public boolean dispatchKeyEvent(KeyEvent event) { 832 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 833 return super.dispatchKeyEvent(event); 834 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 835 return mFocused.dispatchKeyEvent(event); 836 } 837 return false; 838 } 839 840 /** 841 * {@inheritDoc} 842 */ 843 @Override 844 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 845 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 846 return super.dispatchKeyShortcutEvent(event); 847 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 848 return mFocused.dispatchKeyShortcutEvent(event); 849 } 850 return false; 851 } 852 853 /** 854 * {@inheritDoc} 855 */ 856 @Override 857 public boolean dispatchTrackballEvent(MotionEvent event) { 858 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 859 return super.dispatchTrackballEvent(event); 860 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 861 return mFocused.dispatchTrackballEvent(event); 862 } 863 return false; 864 } 865 866 /** 867 * {@inheritDoc} 868 */ 869 @Override 870 public boolean dispatchTouchEvent(MotionEvent ev) { 871 if ((mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS) { 872 if (mSplitMotionTargets == null) { 873 mSplitMotionTargets = new SplitMotionTargets(); 874 } 875 return dispatchSplitTouchEvent(ev); 876 } 877 878 final int action = ev.getAction(); 879 final float xf = ev.getX(); 880 final float yf = ev.getY(); 881 final float scrolledXFloat = xf + mScrollX; 882 final float scrolledYFloat = yf + mScrollY; 883 884 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 885 886 if (action == MotionEvent.ACTION_DOWN) { 887 if (mMotionTarget != null) { 888 // this is weird, we got a pen down, but we thought it was 889 // already down! 890 // XXX: We should probably send an ACTION_UP to the current 891 // target. 892 mMotionTarget = null; 893 } 894 // If we're disallowing intercept or if we're allowing and we didn't 895 // intercept 896 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 897 // reset this event's action (just to protect ourselves) 898 ev.setAction(MotionEvent.ACTION_DOWN); 899 // We know we want to dispatch the event down, find a child 900 // who can handle it, start with the front-most child. 901 final View[] children = mChildren; 902 final int count = mChildrenCount; 903 for (int i = count - 1; i >= 0; i--) { 904 final View child = children[i]; 905 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 906 || child.getAnimation() != null) { 907 // Single dispatch always picks its target based on the initial down 908 // event's position - index 0 909 if (dispatchTouchEventIfInView(child, ev, 0)) { 910 mMotionTarget = child; 911 return true; 912 } 913 } 914 } 915 } 916 } 917 918 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 919 (action == MotionEvent.ACTION_CANCEL); 920 921 if (isUpOrCancel) { 922 // Note, we've already copied the previous state to our local 923 // variable, so this takes effect on the next event 924 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 925 } 926 927 // The event wasn't an ACTION_DOWN, dispatch it to our target if 928 // we have one. 929 final View target = mMotionTarget; 930 if (target == null) { 931 // We don't have a target, this means we're handling the 932 // event as a regular view. 933 ev.setLocation(xf, yf); 934 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 935 ev.setAction(MotionEvent.ACTION_CANCEL); 936 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 937 } 938 return super.dispatchTouchEvent(ev); 939 } 940 941 // Calculate the offset point into the target's local coordinates 942 float xc = scrolledXFloat - (float) target.mLeft; 943 float yc = scrolledYFloat - (float) target.mTop; 944 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 945 // non-identity matrix: transform the point into the view's coordinates 946 final float[] localXY = mAttachInfo.mTmpTransformLocation; 947 localXY[0] = xc; 948 localXY[1] = yc; 949 target.getInverseMatrix().mapPoints(localXY); 950 xc = localXY[0]; 951 yc = localXY[1]; 952 } 953 954 // if have a target, see if we're allowed to and want to intercept its 955 // events 956 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 957 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 958 ev.setAction(MotionEvent.ACTION_CANCEL); 959 ev.setLocation(xc, yc); 960 if (!target.dispatchTouchEvent(ev)) { 961 // target didn't handle ACTION_CANCEL. not much we can do 962 // but they should have. 963 } 964 // clear the target 965 mMotionTarget = null; 966 // Don't dispatch this event to our own view, because we already 967 // saw it when intercepting; we just want to give the following 968 // event to the normal onTouchEvent(). 969 return true; 970 } 971 972 if (isUpOrCancel) { 973 mMotionTarget = null; 974 } 975 976 // finally offset the event to the target's coordinate system and 977 // dispatch the event. 978 ev.setLocation(xc, yc); 979 980 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 981 ev.setAction(MotionEvent.ACTION_CANCEL); 982 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 983 mMotionTarget = null; 984 } 985 986 if (target.dispatchTouchEvent(ev)) { 987 return true; 988 } else { 989 ev.setLocation(xf, yf); 990 } 991 return false; 992 } 993 994 /** 995 * This method detects whether the pointer location at <code>pointerIndex</code> within 996 * <code>ev</code> is inside the specified view. If so, the transformed event is dispatched to 997 * <code>child</code>. 998 * 999 * @param child View to hit test against 1000 * @param ev MotionEvent to test 1001 * @param pointerIndex Index of the pointer within <code>ev</code> to test 1002 * @return <code>false</code> if the hit test failed, or the result of 1003 * <code>child.dispatchTouchEvent</code> 1004 */ 1005 private boolean dispatchTouchEventIfInView(View child, MotionEvent ev, int pointerIndex) { 1006 final float x = ev.getX(pointerIndex); 1007 final float y = ev.getY(pointerIndex); 1008 final float scrolledX = x + mScrollX; 1009 final float scrolledY = y + mScrollY; 1010 float localX = scrolledX - child.mLeft; 1011 float localY = scrolledY - child.mTop; 1012 if (!child.hasIdentityMatrix() && mAttachInfo != null) { 1013 // non-identity matrix: transform the point into the view's coordinates 1014 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1015 localXY[0] = localX; 1016 localXY[1] = localY; 1017 child.getInverseMatrix().mapPoints(localXY); 1018 localX = localXY[0]; 1019 localY = localXY[1]; 1020 } 1021 if (localX >= 0 && localY >= 0 && localX < (child.mRight - child.mLeft) && 1022 localY < (child.mBottom - child.mTop)) { 1023 // It would be safer to clone the event here but we don't for performance. 1024 // There are many subtle interactions in touch event dispatch; change at your own risk. 1025 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1026 ev.offsetLocation(localX - x, localY - y); 1027 if (child.dispatchTouchEvent(ev)) { 1028 return true; 1029 } else { 1030 ev.offsetLocation(x - localX, y - localY); 1031 return false; 1032 } 1033 } 1034 return false; 1035 } 1036 1037 private boolean dispatchSplitTouchEvent(MotionEvent ev) { 1038 final SplitMotionTargets targets = mSplitMotionTargets; 1039 final int action = ev.getAction(); 1040 final int maskedAction = ev.getActionMasked(); 1041 float xf = ev.getX(); 1042 float yf = ev.getY(); 1043 float scrolledXFloat = xf + mScrollX; 1044 float scrolledYFloat = yf + mScrollY; 1045 1046 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1047 1048 if (maskedAction == MotionEvent.ACTION_DOWN || 1049 maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 1050 final int actionIndex = ev.getActionIndex(); 1051 final int actionId = ev.getPointerId(actionIndex); 1052 1053 // Clear out any current target for this ID. 1054 // XXX: We should probably send an ACTION_UP to the current 1055 // target if present. 1056 targets.removeById(actionId); 1057 1058 // If we're disallowing intercept or if we're allowing and we didn't 1059 // intercept 1060 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 1061 // reset this event's action (just to protect ourselves) 1062 ev.setAction(action); 1063 // We know we want to dispatch the event down, try to find a child 1064 // who can handle it, start with the front-most child. 1065 final long downTime = ev.getEventTime(); 1066 final View[] children = mChildren; 1067 final int count = mChildrenCount; 1068 for (int i = count - 1; i >= 0; i--) { 1069 final View child = children[i]; 1070 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1071 || child.getAnimation() != null) { 1072 final MotionEvent childEvent = 1073 targets.filterMotionEventForChild(ev, child, downTime); 1074 if (childEvent != null) { 1075 try { 1076 final int childActionIndex = childEvent.findPointerIndex(actionId); 1077 if (dispatchTouchEventIfInView(child, childEvent, 1078 childActionIndex)) { 1079 targets.add(actionId, child, downTime); 1080 1081 return true; 1082 } 1083 } finally { 1084 childEvent.recycle(); 1085 } 1086 } 1087 } 1088 } 1089 1090 // Didn't find a new target. Do we have a "primary" target to send to? 1091 final SplitMotionTargets.TargetInfo primaryTargetInfo = targets.getPrimaryTarget(); 1092 if (primaryTargetInfo != null) { 1093 final View primaryTarget = primaryTargetInfo.view; 1094 final MotionEvent childEvent = targets.filterMotionEventForChild(ev, 1095 primaryTarget, primaryTargetInfo.downTime); 1096 if (childEvent != null) { 1097 try { 1098 // Calculate the offset point into the target's local coordinates 1099 float xc = scrolledXFloat - (float) primaryTarget.mLeft; 1100 float yc = scrolledYFloat - (float) primaryTarget.mTop; 1101 if (!primaryTarget.hasIdentityMatrix() && mAttachInfo != null) { 1102 // non-identity matrix: transform the point into the view's 1103 // coordinates 1104 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1105 localXY[0] = xc; 1106 localXY[1] = yc; 1107 primaryTarget.getInverseMatrix().mapPoints(localXY); 1108 xc = localXY[0]; 1109 yc = localXY[1]; 1110 } 1111 childEvent.setLocation(xc, yc); 1112 if (primaryTarget.dispatchTouchEvent(childEvent)) { 1113 targets.add(actionId, primaryTarget, primaryTargetInfo.downTime); 1114 return true; 1115 } 1116 } finally { 1117 childEvent.recycle(); 1118 } 1119 } 1120 } 1121 } 1122 } 1123 1124 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 1125 (action == MotionEvent.ACTION_CANCEL); 1126 1127 if (isUpOrCancel) { 1128 // Note, we've already copied the previous state to our local 1129 // variable, so this takes effect on the next event 1130 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1131 } 1132 1133 if (targets.isEmpty()) { 1134 // We don't have any targets, this means we're handling the 1135 // event as a regular view. 1136 ev.setLocation(xf, yf); 1137 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1138 ev.setAction(MotionEvent.ACTION_CANCEL); 1139 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1140 } 1141 return super.dispatchTouchEvent(ev); 1142 } 1143 1144 // if we have targets, see if we're allowed to and want to intercept their 1145 // events 1146 int uniqueTargetCount = targets.getUniqueTargetCount(); 1147 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 1148 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1149 1150 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1151 final View target = targets.getUniqueTargetAt(uniqueIndex).view; 1152 1153 // Calculate the offset point into the target's local coordinates 1154 float xc = scrolledXFloat - (float) target.mLeft; 1155 float yc = scrolledYFloat - (float) target.mTop; 1156 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1157 // non-identity matrix: transform the point into the view's coordinates 1158 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1159 localXY[0] = xc; 1160 localXY[1] = yc; 1161 target.getInverseMatrix().mapPoints(localXY); 1162 xc = localXY[0]; 1163 yc = localXY[1]; 1164 } 1165 1166 ev.setAction(MotionEvent.ACTION_CANCEL); 1167 ev.setLocation(xc, yc); 1168 if (!target.dispatchTouchEvent(ev)) { 1169 // target didn't handle ACTION_CANCEL. not much we can do 1170 // but they should have. 1171 } 1172 } 1173 targets.clear(); 1174 // Don't dispatch this event to our own view, because we already 1175 // saw it when intercepting; we just want to give the following 1176 // event to the normal onTouchEvent(). 1177 return true; 1178 } 1179 1180 boolean handled = false; 1181 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1182 final SplitMotionTargets.TargetInfo targetInfo = targets.getUniqueTargetAt(uniqueIndex); 1183 final View target = targetInfo.view; 1184 1185 final MotionEvent targetEvent = 1186 targets.filterMotionEventForChild(ev, target, targetInfo.downTime); 1187 if (targetEvent == null) { 1188 continue; 1189 } 1190 1191 try { 1192 // Calculate the offset point into the target's local coordinates 1193 xf = targetEvent.getX(); 1194 yf = targetEvent.getY(); 1195 scrolledXFloat = xf + mScrollX; 1196 scrolledYFloat = yf + mScrollY; 1197 float xc = scrolledXFloat - (float) target.mLeft; 1198 float yc = scrolledYFloat - (float) target.mTop; 1199 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1200 // non-identity matrix: transform the point into the view's coordinates 1201 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1202 localXY[0] = xc; 1203 localXY[1] = yc; 1204 target.getInverseMatrix().mapPoints(localXY); 1205 xc = localXY[0]; 1206 yc = localXY[1]; 1207 } 1208 1209 // finally offset the event to the target's coordinate system and 1210 // dispatch the event. 1211 targetEvent.setLocation(xc, yc); 1212 1213 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1214 targetEvent.setAction(MotionEvent.ACTION_CANCEL); 1215 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1216 targets.removeView(target); 1217 uniqueIndex--; 1218 uniqueTargetCount--; 1219 } 1220 1221 final boolean childHandled = target.dispatchTouchEvent(targetEvent); 1222 handled |= childHandled; 1223 if (!childHandled) { 1224 // Child doesn't want these events anymore, but we're still dispatching 1225 // other split events to children. 1226 targets.removeView(target); 1227 } 1228 } finally { 1229 targetEvent.recycle(); 1230 } 1231 } 1232 1233 if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 1234 final int removeId = ev.getPointerId(ev.getActionIndex()); 1235 targets.removeById(removeId); 1236 } 1237 1238 if (isUpOrCancel) { 1239 targets.clear(); 1240 } 1241 1242 return handled; 1243 } 1244 1245 /** 1246 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1247 * dispatch. This behavior is disabled by default. 1248 * 1249 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1250 * views depending on where each pointer initially went down. This allows for user interactions 1251 * such as scrolling two panes of content independently, chording of buttons, and performing 1252 * independent gestures on different pieces of content. 1253 * 1254 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1255 * child views. <code>false</code> to only allow one child view to be the target of 1256 * any MotionEvent received by this ViewGroup. 1257 */ 1258 public void setMotionEventSplittingEnabled(boolean split) { 1259 // TODO Applications really shouldn't change this setting mid-touch event, 1260 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1261 // with gestures in progress when this is changed. 1262 if (split) { 1263 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1264 } else { 1265 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1266 mSplitMotionTargets = null; 1267 } 1268 } 1269 1270 /** 1271 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1272 */ 1273 public boolean isMotionEventSplittingEnabled() { 1274 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1275 } 1276 1277 /** 1278 * {@inheritDoc} 1279 */ 1280 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1281 1282 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1283 // We're already in this state, assume our ancestors are too 1284 return; 1285 } 1286 1287 if (disallowIntercept) { 1288 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1289 } else { 1290 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1291 } 1292 1293 // Pass it up to our parent 1294 if (mParent != null) { 1295 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1296 } 1297 } 1298 1299 /** 1300 * Implement this method to intercept all touch screen motion events. This 1301 * allows you to watch events as they are dispatched to your children, and 1302 * take ownership of the current gesture at any point. 1303 * 1304 * <p>Using this function takes some care, as it has a fairly complicated 1305 * interaction with {@link View#onTouchEvent(MotionEvent) 1306 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1307 * that method as well as this one in the correct way. Events will be 1308 * received in the following order: 1309 * 1310 * <ol> 1311 * <li> You will receive the down event here. 1312 * <li> The down event will be handled either by a child of this view 1313 * group, or given to your own onTouchEvent() method to handle; this means 1314 * you should implement onTouchEvent() to return true, so you will 1315 * continue to see the rest of the gesture (instead of looking for 1316 * a parent view to handle it). Also, by returning true from 1317 * onTouchEvent(), you will not receive any following 1318 * events in onInterceptTouchEvent() and all touch processing must 1319 * happen in onTouchEvent() like normal. 1320 * <li> For as long as you return false from this function, each following 1321 * event (up to and including the final up) will be delivered first here 1322 * and then to the target's onTouchEvent(). 1323 * <li> If you return true from here, you will not receive any 1324 * following events: the target view will receive the same event but 1325 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1326 * events will be delivered to your onTouchEvent() method and no longer 1327 * appear here. 1328 * </ol> 1329 * 1330 * @param ev The motion event being dispatched down the hierarchy. 1331 * @return Return true to steal motion events from the children and have 1332 * them dispatched to this ViewGroup through onTouchEvent(). 1333 * The current target will receive an ACTION_CANCEL event, and no further 1334 * messages will be delivered here. 1335 */ 1336 public boolean onInterceptTouchEvent(MotionEvent ev) { 1337 return false; 1338 } 1339 1340 /** 1341 * {@inheritDoc} 1342 * 1343 * Looks for a view to give focus to respecting the setting specified by 1344 * {@link #getDescendantFocusability()}. 1345 * 1346 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1347 * find focus within the children of this group when appropriate. 1348 * 1349 * @see #FOCUS_BEFORE_DESCENDANTS 1350 * @see #FOCUS_AFTER_DESCENDANTS 1351 * @see #FOCUS_BLOCK_DESCENDANTS 1352 * @see #onRequestFocusInDescendants 1353 */ 1354 @Override 1355 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1356 if (DBG) { 1357 System.out.println(this + " ViewGroup.requestFocus direction=" 1358 + direction); 1359 } 1360 int descendantFocusability = getDescendantFocusability(); 1361 1362 switch (descendantFocusability) { 1363 case FOCUS_BLOCK_DESCENDANTS: 1364 return super.requestFocus(direction, previouslyFocusedRect); 1365 case FOCUS_BEFORE_DESCENDANTS: { 1366 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1367 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1368 } 1369 case FOCUS_AFTER_DESCENDANTS: { 1370 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1371 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1372 } 1373 default: 1374 throw new IllegalStateException("descendant focusability must be " 1375 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1376 + "but is " + descendantFocusability); 1377 } 1378 } 1379 1380 /** 1381 * Look for a descendant to call {@link View#requestFocus} on. 1382 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1383 * when it wants to request focus within its children. Override this to 1384 * customize how your {@link ViewGroup} requests focus within its children. 1385 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1386 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1387 * to give a finer grained hint about where focus is coming from. May be null 1388 * if there is no hint. 1389 * @return Whether focus was taken. 1390 */ 1391 @SuppressWarnings({"ConstantConditions"}) 1392 protected boolean onRequestFocusInDescendants(int direction, 1393 Rect previouslyFocusedRect) { 1394 int index; 1395 int increment; 1396 int end; 1397 int count = mChildrenCount; 1398 if ((direction & FOCUS_FORWARD) != 0) { 1399 index = 0; 1400 increment = 1; 1401 end = count; 1402 } else { 1403 index = count - 1; 1404 increment = -1; 1405 end = -1; 1406 } 1407 final View[] children = mChildren; 1408 for (int i = index; i != end; i += increment) { 1409 View child = children[i]; 1410 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1411 if (child.requestFocus(direction, previouslyFocusedRect)) { 1412 return true; 1413 } 1414 } 1415 } 1416 return false; 1417 } 1418 1419 /** 1420 * {@inheritDoc} 1421 * 1422 * @hide 1423 */ 1424 @Override 1425 public void dispatchStartTemporaryDetach() { 1426 super.dispatchStartTemporaryDetach(); 1427 final int count = mChildrenCount; 1428 final View[] children = mChildren; 1429 for (int i = 0; i < count; i++) { 1430 children[i].dispatchStartTemporaryDetach(); 1431 } 1432 } 1433 1434 /** 1435 * {@inheritDoc} 1436 * 1437 * @hide 1438 */ 1439 @Override 1440 public void dispatchFinishTemporaryDetach() { 1441 super.dispatchFinishTemporaryDetach(); 1442 final int count = mChildrenCount; 1443 final View[] children = mChildren; 1444 for (int i = 0; i < count; i++) { 1445 children[i].dispatchFinishTemporaryDetach(); 1446 } 1447 } 1448 1449 /** 1450 * {@inheritDoc} 1451 */ 1452 @Override 1453 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1454 super.dispatchAttachedToWindow(info, visibility); 1455 visibility |= mViewFlags & VISIBILITY_MASK; 1456 final int count = mChildrenCount; 1457 final View[] children = mChildren; 1458 for (int i = 0; i < count; i++) { 1459 children[i].dispatchAttachedToWindow(info, visibility); 1460 } 1461 } 1462 1463 @Override 1464 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1465 boolean populated = false; 1466 for (int i = 0, count = getChildCount(); i < count; i++) { 1467 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1468 } 1469 return populated; 1470 } 1471 1472 /** 1473 * {@inheritDoc} 1474 */ 1475 @Override 1476 void dispatchDetachedFromWindow() { 1477 // If we still have a motion target, we are still in the process of 1478 // dispatching motion events to a child; we need to get rid of that 1479 // child to avoid dispatching events to it after the window is torn 1480 // down. To make sure we keep the child in a consistent state, we 1481 // first send it an ACTION_CANCEL motion event. 1482 if (mMotionTarget != null) { 1483 final long now = SystemClock.uptimeMillis(); 1484 final MotionEvent event = MotionEvent.obtain(now, now, 1485 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1486 mMotionTarget.dispatchTouchEvent(event); 1487 event.recycle(); 1488 mMotionTarget = null; 1489 } 1490 1491 final int count = mChildrenCount; 1492 final View[] children = mChildren; 1493 for (int i = 0; i < count; i++) { 1494 children[i].dispatchDetachedFromWindow(); 1495 } 1496 super.dispatchDetachedFromWindow(); 1497 } 1498 1499 /** 1500 * {@inheritDoc} 1501 */ 1502 @Override 1503 public void setPadding(int left, int top, int right, int bottom) { 1504 super.setPadding(left, top, right, bottom); 1505 1506 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1507 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1508 } else { 1509 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1510 } 1511 } 1512 1513 /** 1514 * {@inheritDoc} 1515 */ 1516 @Override 1517 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1518 super.dispatchSaveInstanceState(container); 1519 final int count = mChildrenCount; 1520 final View[] children = mChildren; 1521 for (int i = 0; i < count; i++) { 1522 View c = children[i]; 1523 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1524 c.dispatchSaveInstanceState(container); 1525 } 1526 } 1527 } 1528 1529 /** 1530 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1531 * not to its children. For use when overriding 1532 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1533 * their own state but not the state of their children. 1534 * 1535 * @param container the container 1536 */ 1537 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1538 super.dispatchSaveInstanceState(container); 1539 } 1540 1541 /** 1542 * {@inheritDoc} 1543 */ 1544 @Override 1545 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1546 super.dispatchRestoreInstanceState(container); 1547 final int count = mChildrenCount; 1548 final View[] children = mChildren; 1549 for (int i = 0; i < count; i++) { 1550 View c = children[i]; 1551 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1552 c.dispatchRestoreInstanceState(container); 1553 } 1554 } 1555 } 1556 1557 /** 1558 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1559 * not to its children. For use when overriding 1560 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1561 * their own state but not the state of their children. 1562 * 1563 * @param container the container 1564 */ 1565 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1566 super.dispatchRestoreInstanceState(container); 1567 } 1568 1569 /** 1570 * Enables or disables the drawing cache for each child of this view group. 1571 * 1572 * @param enabled true to enable the cache, false to dispose of it 1573 */ 1574 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1575 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1576 final View[] children = mChildren; 1577 final int count = mChildrenCount; 1578 for (int i = 0; i < count; i++) { 1579 children[i].setDrawingCacheEnabled(enabled); 1580 } 1581 } 1582 } 1583 1584 @Override 1585 protected void onAnimationStart() { 1586 super.onAnimationStart(); 1587 1588 // When this ViewGroup's animation starts, build the cache for the children 1589 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1590 final int count = mChildrenCount; 1591 final View[] children = mChildren; 1592 1593 for (int i = 0; i < count; i++) { 1594 final View child = children[i]; 1595 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1596 child.setDrawingCacheEnabled(true); 1597 child.buildDrawingCache(true); 1598 } 1599 } 1600 1601 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1602 } 1603 } 1604 1605 @Override 1606 protected void onAnimationEnd() { 1607 super.onAnimationEnd(); 1608 1609 // When this ViewGroup's animation ends, destroy the cache of the children 1610 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1611 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1612 1613 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1614 setChildrenDrawingCacheEnabled(false); 1615 } 1616 } 1617 } 1618 1619 @Override 1620 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1621 int count = mChildrenCount; 1622 int[] visibilities = null; 1623 1624 if (skipChildren) { 1625 visibilities = new int[count]; 1626 for (int i = 0; i < count; i++) { 1627 View child = getChildAt(i); 1628 visibilities[i] = child.getVisibility(); 1629 if (visibilities[i] == View.VISIBLE) { 1630 child.setVisibility(INVISIBLE); 1631 } 1632 } 1633 } 1634 1635 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1636 1637 if (skipChildren) { 1638 for (int i = 0; i < count; i++) { 1639 getChildAt(i).setVisibility(visibilities[i]); 1640 } 1641 } 1642 1643 return b; 1644 } 1645 1646 /** 1647 * {@inheritDoc} 1648 */ 1649 @Override 1650 protected void dispatchDraw(Canvas canvas) { 1651 final int count = mChildrenCount; 1652 final View[] children = mChildren; 1653 int flags = mGroupFlags; 1654 1655 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1656 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1657 1658 for (int i = 0; i < count; i++) { 1659 final View child = children[i]; 1660 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1661 final LayoutParams params = child.getLayoutParams(); 1662 attachLayoutAnimationParameters(child, params, i, count); 1663 bindLayoutAnimation(child); 1664 if (cache) { 1665 child.setDrawingCacheEnabled(true); 1666 child.buildDrawingCache(true); 1667 } 1668 } 1669 } 1670 1671 final LayoutAnimationController controller = mLayoutAnimationController; 1672 if (controller.willOverlap()) { 1673 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1674 } 1675 1676 controller.start(); 1677 1678 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1679 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1680 1681 if (cache) { 1682 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1683 } 1684 1685 if (mAnimationListener != null) { 1686 mAnimationListener.onAnimationStart(controller.getAnimation()); 1687 } 1688 } 1689 1690 int saveCount = 0; 1691 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1692 if (clipToPadding) { 1693 saveCount = canvas.save(); 1694 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1695 mScrollX + mRight - mLeft - mPaddingRight, 1696 mScrollY + mBottom - mTop - mPaddingBottom); 1697 1698 } 1699 1700 // We will draw our child's animation, let's reset the flag 1701 mPrivateFlags &= ~DRAW_ANIMATION; 1702 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1703 1704 boolean more = false; 1705 final long drawingTime = getDrawingTime(); 1706 1707 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1708 for (int i = 0; i < count; i++) { 1709 final View child = children[i]; 1710 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1711 more |= drawChild(canvas, child, drawingTime); 1712 } 1713 } 1714 } else { 1715 for (int i = 0; i < count; i++) { 1716 final View child = children[getChildDrawingOrder(count, i)]; 1717 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1718 more |= drawChild(canvas, child, drawingTime); 1719 } 1720 } 1721 } 1722 1723 // Draw any disappearing views that have animations 1724 if (mDisappearingChildren != null) { 1725 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1726 final int disappearingCount = disappearingChildren.size() - 1; 1727 // Go backwards -- we may delete as animations finish 1728 for (int i = disappearingCount; i >= 0; i--) { 1729 final View child = disappearingChildren.get(i); 1730 more |= drawChild(canvas, child, drawingTime); 1731 } 1732 } 1733 1734 if (clipToPadding) { 1735 canvas.restoreToCount(saveCount); 1736 } 1737 1738 // mGroupFlags might have been updated by drawChild() 1739 flags = mGroupFlags; 1740 1741 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1742 invalidate(); 1743 } 1744 1745 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1746 mLayoutAnimationController.isDone() && !more) { 1747 // We want to erase the drawing cache and notify the listener after the 1748 // next frame is drawn because one extra invalidate() is caused by 1749 // drawChild() after the animation is over 1750 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1751 final Runnable end = new Runnable() { 1752 public void run() { 1753 notifyAnimationListener(); 1754 } 1755 }; 1756 post(end); 1757 } 1758 } 1759 1760 /** 1761 * Returns the index of the child to draw for this iteration. Override this 1762 * if you want to change the drawing order of children. By default, it 1763 * returns i. 1764 * <p> 1765 * NOTE: In order for this method to be called, you must enable child ordering 1766 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1767 * 1768 * @param i The current iteration. 1769 * @return The index of the child to draw this iteration. 1770 * 1771 * @see #setChildrenDrawingOrderEnabled(boolean) 1772 * @see #isChildrenDrawingOrderEnabled() 1773 */ 1774 protected int getChildDrawingOrder(int childCount, int i) { 1775 return i; 1776 } 1777 1778 private void notifyAnimationListener() { 1779 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1780 mGroupFlags |= FLAG_ANIMATION_DONE; 1781 1782 if (mAnimationListener != null) { 1783 final Runnable end = new Runnable() { 1784 public void run() { 1785 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1786 } 1787 }; 1788 post(end); 1789 } 1790 1791 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1792 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1793 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1794 setChildrenDrawingCacheEnabled(false); 1795 } 1796 } 1797 1798 invalidate(); 1799 } 1800 1801 /** 1802 * Draw one child of this View Group. This method is responsible for getting 1803 * the canvas in the right state. This includes clipping, translating so 1804 * that the child's scrolled origin is at 0, 0, and applying any animation 1805 * transformations. 1806 * 1807 * @param canvas The canvas on which to draw the child 1808 * @param child Who to draw 1809 * @param drawingTime The time at which draw is occuring 1810 * @return True if an invalidate() was issued 1811 */ 1812 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1813 boolean more = false; 1814 1815 final int cl = child.mLeft; 1816 final int ct = child.mTop; 1817 final int cr = child.mRight; 1818 final int cb = child.mBottom; 1819 1820 final int flags = mGroupFlags; 1821 1822 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1823 mChildTransformation.clear(); 1824 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1825 } 1826 1827 Transformation transformToApply = null; 1828 Transformation invalidationTransform; 1829 final Animation a = child.getAnimation(); 1830 boolean concatMatrix = false; 1831 1832 boolean scalingRequired = false; 1833 boolean caching = false; 1834 if (!canvas.isHardwareAccelerated() && 1835 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1836 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1837 caching = true; 1838 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1839 } 1840 1841 if (a != null) { 1842 final boolean initialized = a.isInitialized(); 1843 if (!initialized) { 1844 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1845 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1846 child.onAnimationStart(); 1847 } 1848 1849 more = a.getTransformation(drawingTime, mChildTransformation, 1850 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1851 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1852 if (mInvalidationTransformation == null) { 1853 mInvalidationTransformation = new Transformation(); 1854 } 1855 invalidationTransform = mInvalidationTransformation; 1856 a.getTransformation(drawingTime, invalidationTransform, 1f); 1857 } else { 1858 invalidationTransform = mChildTransformation; 1859 } 1860 transformToApply = mChildTransformation; 1861 1862 concatMatrix = a.willChangeTransformationMatrix(); 1863 1864 if (more) { 1865 if (!a.willChangeBounds()) { 1866 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1867 FLAG_OPTIMIZE_INVALIDATE) { 1868 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1869 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1870 // The child need to draw an animation, potentially offscreen, so 1871 // make sure we do not cancel invalidate requests 1872 mPrivateFlags |= DRAW_ANIMATION; 1873 invalidate(cl, ct, cr, cb); 1874 } 1875 } else { 1876 if (mInvalidateRegion == null) { 1877 mInvalidateRegion = new RectF(); 1878 } 1879 final RectF region = mInvalidateRegion; 1880 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1881 1882 // The child need to draw an animation, potentially offscreen, so 1883 // make sure we do not cancel invalidate requests 1884 mPrivateFlags |= DRAW_ANIMATION; 1885 1886 final int left = cl + (int) region.left; 1887 final int top = ct + (int) region.top; 1888 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1889 } 1890 } 1891 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1892 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1893 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1894 if (hasTransform) { 1895 final int transformType = mChildTransformation.getTransformationType(); 1896 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1897 mChildTransformation : null; 1898 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1899 } 1900 } 1901 1902 concatMatrix |= !child.hasIdentityMatrix(); 1903 1904 // Sets the flag as early as possible to allow draw() implementations 1905 // to call invalidate() successfully when doing animations 1906 child.mPrivateFlags |= DRAWN; 1907 1908 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1909 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1910 return more; 1911 } 1912 1913 child.computeScroll(); 1914 1915 final int sx = child.mScrollX; 1916 final int sy = child.mScrollY; 1917 1918 Bitmap cache = null; 1919 if (caching) { 1920 cache = child.getDrawingCache(true); 1921 } 1922 1923 final boolean hasNoCache = cache == null; 1924 1925 final int restoreTo = canvas.save(); 1926 if (hasNoCache) { 1927 canvas.translate(cl - sx, ct - sy); 1928 } else { 1929 canvas.translate(cl, ct); 1930 if (scalingRequired) { 1931 // mAttachInfo cannot be null, otherwise scalingRequired == false 1932 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1933 canvas.scale(scale, scale); 1934 } 1935 } 1936 1937 float alpha = child.getAlpha(); 1938 1939 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1940 int transX = 0; 1941 int transY = 0; 1942 1943 if (hasNoCache) { 1944 transX = -sx; 1945 transY = -sy; 1946 } 1947 1948 if (transformToApply != null) { 1949 if (concatMatrix) { 1950 // Undo the scroll translation, apply the transformation matrix, 1951 // then redo the scroll translate to get the correct result. 1952 canvas.translate(-transX, -transY); 1953 canvas.concat(transformToApply.getMatrix()); 1954 canvas.translate(transX, transY); 1955 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1956 } 1957 1958 float transformAlpha = transformToApply.getAlpha(); 1959 if (transformAlpha < 1.0f) { 1960 alpha *= transformToApply.getAlpha(); 1961 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1962 } 1963 } 1964 1965 if (!child.hasIdentityMatrix()) { 1966 canvas.translate(-transX, -transY); 1967 canvas.concat(child.getMatrix()); 1968 canvas.translate(transX, transY); 1969 } 1970 1971 if (alpha < 1.0f) { 1972 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1973 1974 if (hasNoCache) { 1975 final int multipliedAlpha = (int) (255 * alpha); 1976 if (!child.onSetAlpha(multipliedAlpha)) { 1977 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1978 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1979 } else { 1980 child.mPrivateFlags |= ALPHA_SET; 1981 } 1982 } 1983 } 1984 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1985 child.onSetAlpha(255); 1986 child.mPrivateFlags &= ~ALPHA_SET; 1987 } 1988 1989 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1990 if (hasNoCache) { 1991 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1992 } else { 1993 if (!scalingRequired) { 1994 canvas.clipRect(0, 0, cr - cl, cb - ct); 1995 } else { 1996 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 1997 } 1998 } 1999 } 2000 2001 if (hasNoCache) { 2002 // Fast path for layouts with no backgrounds 2003 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 2004 if (ViewDebug.TRACE_HIERARCHY) { 2005 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 2006 } 2007 child.mPrivateFlags &= ~DIRTY_MASK; 2008 child.dispatchDraw(canvas); 2009 } else { 2010 child.draw(canvas); 2011 } 2012 } else { 2013 final Paint cachePaint = mCachePaint; 2014 if (alpha < 1.0f) { 2015 cachePaint.setAlpha((int) (alpha * 255)); 2016 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2017 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2018 cachePaint.setAlpha(255); 2019 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2020 } 2021 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2022 } 2023 2024 canvas.restoreToCount(restoreTo); 2025 2026 if (a != null && !more) { 2027 child.onSetAlpha(255); 2028 finishAnimatingView(child, a); 2029 } 2030 2031 return more; 2032 } 2033 2034 /** 2035 * By default, children are clipped to their bounds before drawing. This 2036 * allows view groups to override this behavior for animations, etc. 2037 * 2038 * @param clipChildren true to clip children to their bounds, 2039 * false otherwise 2040 * @attr ref android.R.styleable#ViewGroup_clipChildren 2041 */ 2042 public void setClipChildren(boolean clipChildren) { 2043 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2044 } 2045 2046 /** 2047 * By default, children are clipped to the padding of the ViewGroup. This 2048 * allows view groups to override this behavior 2049 * 2050 * @param clipToPadding true to clip children to the padding of the 2051 * group, false otherwise 2052 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2053 */ 2054 public void setClipToPadding(boolean clipToPadding) { 2055 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2056 } 2057 2058 /** 2059 * {@inheritDoc} 2060 */ 2061 @Override 2062 public void dispatchSetSelected(boolean selected) { 2063 final View[] children = mChildren; 2064 final int count = mChildrenCount; 2065 for (int i = 0; i < count; i++) { 2066 2067 children[i].setSelected(selected); 2068 } 2069 } 2070 2071 @Override 2072 protected void dispatchSetPressed(boolean pressed) { 2073 final View[] children = mChildren; 2074 final int count = mChildrenCount; 2075 for (int i = 0; i < count; i++) { 2076 children[i].setPressed(pressed); 2077 } 2078 } 2079 2080 /** 2081 * When this property is set to true, this ViewGroup supports static transformations on 2082 * children; this causes 2083 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2084 * invoked when a child is drawn. 2085 * 2086 * Any subclass overriding 2087 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2088 * set this property to true. 2089 * 2090 * @param enabled True to enable static transformations on children, false otherwise. 2091 * 2092 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2093 */ 2094 protected void setStaticTransformationsEnabled(boolean enabled) { 2095 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2096 } 2097 2098 /** 2099 * {@inheritDoc} 2100 * 2101 * @see #setStaticTransformationsEnabled(boolean) 2102 */ 2103 protected boolean getChildStaticTransformation(View child, Transformation t) { 2104 return false; 2105 } 2106 2107 /** 2108 * {@hide} 2109 */ 2110 @Override 2111 protected View findViewTraversal(int id) { 2112 if (id == mID) { 2113 return this; 2114 } 2115 2116 final View[] where = mChildren; 2117 final int len = mChildrenCount; 2118 2119 for (int i = 0; i < len; i++) { 2120 View v = where[i]; 2121 2122 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2123 v = v.findViewById(id); 2124 2125 if (v != null) { 2126 return v; 2127 } 2128 } 2129 } 2130 2131 return null; 2132 } 2133 2134 /** 2135 * {@hide} 2136 */ 2137 @Override 2138 protected View findViewWithTagTraversal(Object tag) { 2139 if (tag != null && tag.equals(mTag)) { 2140 return this; 2141 } 2142 2143 final View[] where = mChildren; 2144 final int len = mChildrenCount; 2145 2146 for (int i = 0; i < len; i++) { 2147 View v = where[i]; 2148 2149 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2150 v = v.findViewWithTag(tag); 2151 2152 if (v != null) { 2153 return v; 2154 } 2155 } 2156 } 2157 2158 return null; 2159 } 2160 2161 /** 2162 * Adds a child view. If no layout parameters are already set on the child, the 2163 * default parameters for this ViewGroup are set on the child. 2164 * 2165 * @param child the child view to add 2166 * 2167 * @see #generateDefaultLayoutParams() 2168 */ 2169 public void addView(View child) { 2170 addView(child, -1); 2171 } 2172 2173 /** 2174 * Adds a child view. If no layout parameters are already set on the child, the 2175 * default parameters for this ViewGroup are set on the child. 2176 * 2177 * @param child the child view to add 2178 * @param index the position at which to add the child 2179 * 2180 * @see #generateDefaultLayoutParams() 2181 */ 2182 public void addView(View child, int index) { 2183 LayoutParams params = child.getLayoutParams(); 2184 if (params == null) { 2185 params = generateDefaultLayoutParams(); 2186 if (params == null) { 2187 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2188 } 2189 } 2190 addView(child, index, params); 2191 } 2192 2193 /** 2194 * Adds a child view with this ViewGroup's default layout parameters and the 2195 * specified width and height. 2196 * 2197 * @param child the child view to add 2198 */ 2199 public void addView(View child, int width, int height) { 2200 final LayoutParams params = generateDefaultLayoutParams(); 2201 params.width = width; 2202 params.height = height; 2203 addView(child, -1, params); 2204 } 2205 2206 /** 2207 * Adds a child view with the specified layout parameters. 2208 * 2209 * @param child the child view to add 2210 * @param params the layout parameters to set on the child 2211 */ 2212 public void addView(View child, LayoutParams params) { 2213 addView(child, -1, params); 2214 } 2215 2216 /** 2217 * Adds a child view with the specified layout parameters. 2218 * 2219 * @param child the child view to add 2220 * @param index the position at which to add the child 2221 * @param params the layout parameters to set on the child 2222 */ 2223 public void addView(View child, int index, LayoutParams params) { 2224 if (DBG) { 2225 System.out.println(this + " addView"); 2226 } 2227 2228 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2229 // therefore, we call requestLayout() on ourselves before, so that the child's request 2230 // will be blocked at our level 2231 requestLayout(); 2232 invalidate(); 2233 addViewInner(child, index, params, false); 2234 } 2235 2236 /** 2237 * {@inheritDoc} 2238 */ 2239 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2240 if (!checkLayoutParams(params)) { 2241 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2242 } 2243 if (view.mParent != this) { 2244 throw new IllegalArgumentException("Given view not a child of " + this); 2245 } 2246 view.setLayoutParams(params); 2247 } 2248 2249 /** 2250 * {@inheritDoc} 2251 */ 2252 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2253 return p != null; 2254 } 2255 2256 /** 2257 * Interface definition for a callback to be invoked when the hierarchy 2258 * within this view changed. The hierarchy changes whenever a child is added 2259 * to or removed from this view. 2260 */ 2261 public interface OnHierarchyChangeListener { 2262 /** 2263 * Called when a new child is added to a parent view. 2264 * 2265 * @param parent the view in which a child was added 2266 * @param child the new child view added in the hierarchy 2267 */ 2268 void onChildViewAdded(View parent, View child); 2269 2270 /** 2271 * Called when a child is removed from a parent view. 2272 * 2273 * @param parent the view from which the child was removed 2274 * @param child the child removed from the hierarchy 2275 */ 2276 void onChildViewRemoved(View parent, View child); 2277 } 2278 2279 /** 2280 * Register a callback to be invoked when a child is added to or removed 2281 * from this view. 2282 * 2283 * @param listener the callback to invoke on hierarchy change 2284 */ 2285 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2286 mOnHierarchyChangeListener = listener; 2287 } 2288 2289 /** 2290 * Adds a view during layout. This is useful if in your onLayout() method, 2291 * you need to add more views (as does the list view for example). 2292 * 2293 * If index is negative, it means put it at the end of the list. 2294 * 2295 * @param child the view to add to the group 2296 * @param index the index at which the child must be added 2297 * @param params the layout parameters to associate with the child 2298 * @return true if the child was added, false otherwise 2299 */ 2300 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2301 return addViewInLayout(child, index, params, false); 2302 } 2303 2304 /** 2305 * Adds a view during layout. This is useful if in your onLayout() method, 2306 * you need to add more views (as does the list view for example). 2307 * 2308 * If index is negative, it means put it at the end of the list. 2309 * 2310 * @param child the view to add to the group 2311 * @param index the index at which the child must be added 2312 * @param params the layout parameters to associate with the child 2313 * @param preventRequestLayout if true, calling this method will not trigger a 2314 * layout request on child 2315 * @return true if the child was added, false otherwise 2316 */ 2317 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2318 boolean preventRequestLayout) { 2319 child.mParent = null; 2320 addViewInner(child, index, params, preventRequestLayout); 2321 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2322 return true; 2323 } 2324 2325 /** 2326 * Prevents the specified child to be laid out during the next layout pass. 2327 * 2328 * @param child the child on which to perform the cleanup 2329 */ 2330 protected void cleanupLayoutState(View child) { 2331 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2332 } 2333 2334 private void addViewInner(View child, int index, LayoutParams params, 2335 boolean preventRequestLayout) { 2336 2337 if (child.getParent() != null) { 2338 throw new IllegalStateException("The specified child already has a parent. " + 2339 "You must call removeView() on the child's parent first."); 2340 } 2341 2342 if (mTransition != null) { 2343 mTransition.childAdd(this, child); 2344 } 2345 2346 if (!checkLayoutParams(params)) { 2347 params = generateLayoutParams(params); 2348 } 2349 2350 if (preventRequestLayout) { 2351 child.mLayoutParams = params; 2352 } else { 2353 child.setLayoutParams(params); 2354 } 2355 2356 if (index < 0) { 2357 index = mChildrenCount; 2358 } 2359 2360 addInArray(child, index); 2361 2362 // tell our children 2363 if (preventRequestLayout) { 2364 child.assignParent(this); 2365 } else { 2366 child.mParent = this; 2367 } 2368 2369 if (child.hasFocus()) { 2370 requestChildFocus(child, child.findFocus()); 2371 } 2372 2373 AttachInfo ai = mAttachInfo; 2374 if (ai != null) { 2375 boolean lastKeepOn = ai.mKeepScreenOn; 2376 ai.mKeepScreenOn = false; 2377 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2378 if (ai.mKeepScreenOn) { 2379 needGlobalAttributesUpdate(true); 2380 } 2381 ai.mKeepScreenOn = lastKeepOn; 2382 } 2383 2384 if (mOnHierarchyChangeListener != null) { 2385 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2386 } 2387 2388 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2389 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2390 } 2391 } 2392 2393 private void addInArray(View child, int index) { 2394 View[] children = mChildren; 2395 final int count = mChildrenCount; 2396 final int size = children.length; 2397 if (index == count) { 2398 if (size == count) { 2399 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2400 System.arraycopy(children, 0, mChildren, 0, size); 2401 children = mChildren; 2402 } 2403 children[mChildrenCount++] = child; 2404 } else if (index < count) { 2405 if (size == count) { 2406 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2407 System.arraycopy(children, 0, mChildren, 0, index); 2408 System.arraycopy(children, index, mChildren, index + 1, count - index); 2409 children = mChildren; 2410 } else { 2411 System.arraycopy(children, index, children, index + 1, count - index); 2412 } 2413 children[index] = child; 2414 mChildrenCount++; 2415 } else { 2416 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2417 } 2418 } 2419 2420 // This method also sets the child's mParent to null 2421 private void removeFromArray(int index) { 2422 final View[] children = mChildren; 2423 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 2424 children[index].mParent = null; 2425 } 2426 final int count = mChildrenCount; 2427 if (index == count - 1) { 2428 children[--mChildrenCount] = null; 2429 } else if (index >= 0 && index < count) { 2430 System.arraycopy(children, index + 1, children, index, count - index - 1); 2431 children[--mChildrenCount] = null; 2432 } else { 2433 throw new IndexOutOfBoundsException(); 2434 } 2435 } 2436 2437 // This method also sets the children's mParent to null 2438 private void removeFromArray(int start, int count) { 2439 final View[] children = mChildren; 2440 final int childrenCount = mChildrenCount; 2441 2442 start = Math.max(0, start); 2443 final int end = Math.min(childrenCount, start + count); 2444 2445 if (start == end) { 2446 return; 2447 } 2448 2449 if (end == childrenCount) { 2450 for (int i = start; i < end; i++) { 2451 children[i].mParent = null; 2452 children[i] = null; 2453 } 2454 } else { 2455 for (int i = start; i < end; i++) { 2456 children[i].mParent = null; 2457 } 2458 2459 // Since we're looping above, we might as well do the copy, but is arraycopy() 2460 // faster than the extra 2 bounds checks we would do in the loop? 2461 System.arraycopy(children, end, children, start, childrenCount - end); 2462 2463 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2464 children[i] = null; 2465 } 2466 } 2467 2468 mChildrenCount -= (end - start); 2469 } 2470 2471 private void bindLayoutAnimation(View child) { 2472 Animation a = mLayoutAnimationController.getAnimationForView(child); 2473 child.setAnimation(a); 2474 } 2475 2476 /** 2477 * Subclasses should override this method to set layout animation 2478 * parameters on the supplied child. 2479 * 2480 * @param child the child to associate with animation parameters 2481 * @param params the child's layout parameters which hold the animation 2482 * parameters 2483 * @param index the index of the child in the view group 2484 * @param count the number of children in the view group 2485 */ 2486 protected void attachLayoutAnimationParameters(View child, 2487 LayoutParams params, int index, int count) { 2488 LayoutAnimationController.AnimationParameters animationParams = 2489 params.layoutAnimationParameters; 2490 if (animationParams == null) { 2491 animationParams = new LayoutAnimationController.AnimationParameters(); 2492 params.layoutAnimationParameters = animationParams; 2493 } 2494 2495 animationParams.count = count; 2496 animationParams.index = index; 2497 } 2498 2499 /** 2500 * {@inheritDoc} 2501 */ 2502 public void removeView(View view) { 2503 removeViewInternal(view); 2504 requestLayout(); 2505 invalidate(); 2506 } 2507 2508 /** 2509 * Removes a view during layout. This is useful if in your onLayout() method, 2510 * you need to remove more views. 2511 * 2512 * @param view the view to remove from the group 2513 */ 2514 public void removeViewInLayout(View view) { 2515 removeViewInternal(view); 2516 } 2517 2518 /** 2519 * Removes a range of views during layout. This is useful if in your onLayout() method, 2520 * you need to remove more views. 2521 * 2522 * @param start the index of the first view to remove from the group 2523 * @param count the number of views to remove from the group 2524 */ 2525 public void removeViewsInLayout(int start, int count) { 2526 removeViewsInternal(start, count); 2527 } 2528 2529 /** 2530 * Removes the view at the specified position in the group. 2531 * 2532 * @param index the position in the group of the view to remove 2533 */ 2534 public void removeViewAt(int index) { 2535 removeViewInternal(index, getChildAt(index)); 2536 requestLayout(); 2537 invalidate(); 2538 } 2539 2540 /** 2541 * Removes the specified range of views from the group. 2542 * 2543 * @param start the first position in the group of the range of views to remove 2544 * @param count the number of views to remove 2545 */ 2546 public void removeViews(int start, int count) { 2547 removeViewsInternal(start, count); 2548 requestLayout(); 2549 invalidate(); 2550 } 2551 2552 private void removeViewInternal(View view) { 2553 final int index = indexOfChild(view); 2554 if (index >= 0) { 2555 removeViewInternal(index, view); 2556 } 2557 } 2558 2559 private void removeViewInternal(int index, View view) { 2560 2561 if (mTransition != null) { 2562 mTransition.childRemove(this, view); 2563 } 2564 2565 boolean clearChildFocus = false; 2566 if (view == mFocused) { 2567 view.clearFocusForRemoval(); 2568 clearChildFocus = true; 2569 } 2570 2571 if (view.getAnimation() != null || 2572 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2573 addDisappearingView(view); 2574 } else if (view.mAttachInfo != null) { 2575 view.dispatchDetachedFromWindow(); 2576 } 2577 2578 if (mOnHierarchyChangeListener != null) { 2579 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2580 } 2581 2582 needGlobalAttributesUpdate(false); 2583 2584 removeFromArray(index); 2585 2586 if (clearChildFocus) { 2587 clearChildFocus(view); 2588 } 2589 } 2590 2591 /** 2592 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2593 * not null, changes in layout which occur because of children being added to or removed from 2594 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2595 * object. By default, the transition object is null (so layout changes are not animated). 2596 * 2597 * @param transition The LayoutTransition object that will animated changes in layout. A value 2598 * of <code>null</code> means no transition will run on layout changes. 2599 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 2600 */ 2601 public void setLayoutTransition(LayoutTransition transition) { 2602 mTransition = transition; 2603 if (mTransition != null) { 2604 mTransition.addTransitionListener(mLayoutTransitionListener); 2605 } 2606 } 2607 2608 /** 2609 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 2610 * not null, changes in layout which occur because of children being added to or removed from 2611 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 2612 * object. By default, the transition object is null (so layout changes are not animated). 2613 * 2614 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 2615 * A value of <code>null</code> means no transition will run on layout changes. 2616 */ 2617 public LayoutTransition getLayoutTransition() { 2618 return mTransition; 2619 } 2620 2621 private void removeViewsInternal(int start, int count) { 2622 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2623 final boolean notifyListener = onHierarchyChangeListener != null; 2624 final View focused = mFocused; 2625 final boolean detach = mAttachInfo != null; 2626 View clearChildFocus = null; 2627 2628 final View[] children = mChildren; 2629 final int end = start + count; 2630 2631 for (int i = start; i < end; i++) { 2632 final View view = children[i]; 2633 2634 if (mTransition != null) { 2635 mTransition.childRemove(this, view); 2636 } 2637 2638 if (view == focused) { 2639 view.clearFocusForRemoval(); 2640 clearChildFocus = view; 2641 } 2642 2643 if (view.getAnimation() != null || 2644 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2645 addDisappearingView(view); 2646 } else if (detach) { 2647 view.dispatchDetachedFromWindow(); 2648 } 2649 2650 needGlobalAttributesUpdate(false); 2651 2652 if (notifyListener) { 2653 onHierarchyChangeListener.onChildViewRemoved(this, view); 2654 } 2655 } 2656 2657 removeFromArray(start, count); 2658 2659 if (clearChildFocus != null) { 2660 clearChildFocus(clearChildFocus); 2661 } 2662 } 2663 2664 /** 2665 * Call this method to remove all child views from the 2666 * ViewGroup. 2667 */ 2668 public void removeAllViews() { 2669 removeAllViewsInLayout(); 2670 requestLayout(); 2671 invalidate(); 2672 } 2673 2674 /** 2675 * Called by a ViewGroup subclass to remove child views from itself, 2676 * when it must first know its size on screen before it can calculate how many 2677 * child views it will render. An example is a Gallery or a ListView, which 2678 * may "have" 50 children, but actually only render the number of children 2679 * that can currently fit inside the object on screen. Do not call 2680 * this method unless you are extending ViewGroup and understand the 2681 * view measuring and layout pipeline. 2682 */ 2683 public void removeAllViewsInLayout() { 2684 final int count = mChildrenCount; 2685 if (count <= 0) { 2686 return; 2687 } 2688 2689 final View[] children = mChildren; 2690 mChildrenCount = 0; 2691 2692 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2693 final boolean notify = listener != null; 2694 final View focused = mFocused; 2695 final boolean detach = mAttachInfo != null; 2696 View clearChildFocus = null; 2697 2698 needGlobalAttributesUpdate(false); 2699 2700 for (int i = count - 1; i >= 0; i--) { 2701 final View view = children[i]; 2702 2703 if (mTransition != null) { 2704 mTransition.childRemove(this, view); 2705 } 2706 2707 if (view == focused) { 2708 view.clearFocusForRemoval(); 2709 clearChildFocus = view; 2710 } 2711 2712 if (view.getAnimation() != null || 2713 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 2714 addDisappearingView(view); 2715 } else if (detach) { 2716 view.dispatchDetachedFromWindow(); 2717 } 2718 2719 if (notify) { 2720 listener.onChildViewRemoved(this, view); 2721 } 2722 2723 view.mParent = null; 2724 children[i] = null; 2725 } 2726 2727 if (clearChildFocus != null) { 2728 clearChildFocus(clearChildFocus); 2729 } 2730 } 2731 2732 /** 2733 * Finishes the removal of a detached view. This method will dispatch the detached from 2734 * window event and notify the hierarchy change listener. 2735 * 2736 * @param child the child to be definitely removed from the view hierarchy 2737 * @param animate if true and the view has an animation, the view is placed in the 2738 * disappearing views list, otherwise, it is detached from the window 2739 * 2740 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2741 * @see #detachAllViewsFromParent() 2742 * @see #detachViewFromParent(View) 2743 * @see #detachViewFromParent(int) 2744 */ 2745 protected void removeDetachedView(View child, boolean animate) { 2746 if (mTransition != null) { 2747 mTransition.childRemove(this, child); 2748 } 2749 2750 if (child == mFocused) { 2751 child.clearFocus(); 2752 } 2753 2754 if ((animate && child.getAnimation() != null) || 2755 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 2756 addDisappearingView(child); 2757 } else if (child.mAttachInfo != null) { 2758 child.dispatchDetachedFromWindow(); 2759 } 2760 2761 if (mOnHierarchyChangeListener != null) { 2762 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2763 } 2764 } 2765 2766 /** 2767 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2768 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2769 * by calling {@link #getChildAt(int)}. 2770 * 2771 * This method should be called only for view which were detached from their parent. 2772 * 2773 * @param child the child to attach 2774 * @param index the index at which the child should be attached 2775 * @param params the layout parameters of the child 2776 * 2777 * @see #removeDetachedView(View, boolean) 2778 * @see #detachAllViewsFromParent() 2779 * @see #detachViewFromParent(View) 2780 * @see #detachViewFromParent(int) 2781 */ 2782 protected void attachViewToParent(View child, int index, LayoutParams params) { 2783 child.mLayoutParams = params; 2784 2785 if (index < 0) { 2786 index = mChildrenCount; 2787 } 2788 2789 addInArray(child, index); 2790 2791 child.mParent = this; 2792 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2793 2794 if (child.hasFocus()) { 2795 requestChildFocus(child, child.findFocus()); 2796 } 2797 } 2798 2799 /** 2800 * Detaches a view from its parent. Detaching a view should be temporary and followed 2801 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2802 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2803 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2804 * 2805 * @param child the child to detach 2806 * 2807 * @see #detachViewFromParent(int) 2808 * @see #detachViewsFromParent(int, int) 2809 * @see #detachAllViewsFromParent() 2810 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2811 * @see #removeDetachedView(View, boolean) 2812 */ 2813 protected void detachViewFromParent(View child) { 2814 removeFromArray(indexOfChild(child)); 2815 } 2816 2817 /** 2818 * Detaches a view from its parent. Detaching a view should be temporary and followed 2819 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2820 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2821 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2822 * 2823 * @param index the index of the child to detach 2824 * 2825 * @see #detachViewFromParent(View) 2826 * @see #detachAllViewsFromParent() 2827 * @see #detachViewsFromParent(int, int) 2828 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2829 * @see #removeDetachedView(View, boolean) 2830 */ 2831 protected void detachViewFromParent(int index) { 2832 removeFromArray(index); 2833 } 2834 2835 /** 2836 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2837 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2838 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2839 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2840 * 2841 * @param start the first index of the childrend range to detach 2842 * @param count the number of children to detach 2843 * 2844 * @see #detachViewFromParent(View) 2845 * @see #detachViewFromParent(int) 2846 * @see #detachAllViewsFromParent() 2847 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2848 * @see #removeDetachedView(View, boolean) 2849 */ 2850 protected void detachViewsFromParent(int start, int count) { 2851 removeFromArray(start, count); 2852 } 2853 2854 /** 2855 * Detaches all views from the parent. Detaching a view should be temporary and followed 2856 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2857 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2858 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2859 * 2860 * @see #detachViewFromParent(View) 2861 * @see #detachViewFromParent(int) 2862 * @see #detachViewsFromParent(int, int) 2863 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2864 * @see #removeDetachedView(View, boolean) 2865 */ 2866 protected void detachAllViewsFromParent() { 2867 final int count = mChildrenCount; 2868 if (count <= 0) { 2869 return; 2870 } 2871 2872 final View[] children = mChildren; 2873 mChildrenCount = 0; 2874 2875 for (int i = count - 1; i >= 0; i--) { 2876 children[i].mParent = null; 2877 children[i] = null; 2878 } 2879 } 2880 2881 /** 2882 * Don't call or override this method. It is used for the implementation of 2883 * the view hierarchy. 2884 */ 2885 public final void invalidateChild(View child, final Rect dirty) { 2886 if (ViewDebug.TRACE_HIERARCHY) { 2887 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2888 } 2889 2890 ViewParent parent = this; 2891 2892 final AttachInfo attachInfo = mAttachInfo; 2893 if (attachInfo != null) { 2894 final int[] location = attachInfo.mInvalidateChildLocation; 2895 location[CHILD_LEFT_INDEX] = child.mLeft; 2896 location[CHILD_TOP_INDEX] = child.mTop; 2897 Matrix childMatrix = child.getMatrix(); 2898 if (!childMatrix.isIdentity()) { 2899 RectF boundingRect = attachInfo.mTmpTransformRect; 2900 boundingRect.set(dirty); 2901 childMatrix.mapRect(boundingRect); 2902 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2903 (int) (boundingRect.right + 0.5f), 2904 (int) (boundingRect.bottom + 0.5f)); 2905 } 2906 2907 // If the child is drawing an animation, we want to copy this flag onto 2908 // ourselves and the parent to make sure the invalidate request goes 2909 // through 2910 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2911 2912 // Check whether the child that requests the invalidate is fully opaque 2913 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2914 child.getAnimation() != null; 2915 // Mark the child as dirty, using the appropriate flag 2916 // Make sure we do not set both flags at the same time 2917 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2918 2919 do { 2920 View view = null; 2921 if (parent instanceof View) { 2922 view = (View) parent; 2923 } 2924 2925 if (drawAnimation) { 2926 if (view != null) { 2927 view.mPrivateFlags |= DRAW_ANIMATION; 2928 } else if (parent instanceof ViewRoot) { 2929 ((ViewRoot) parent).mIsAnimating = true; 2930 } 2931 } 2932 2933 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2934 // flag coming from the child that initiated the invalidate 2935 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2936 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2937 } 2938 2939 parent = parent.invalidateChildInParent(location, dirty); 2940 if (view != null) { 2941 // Account for transform on current parent 2942 Matrix m = view.getMatrix(); 2943 if (!m.isIdentity()) { 2944 RectF boundingRect = attachInfo.mTmpTransformRect; 2945 boundingRect.set(dirty); 2946 m.mapRect(boundingRect); 2947 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2948 (int) (boundingRect.right + 0.5f), 2949 (int) (boundingRect.bottom + 0.5f)); 2950 } 2951 } 2952 } while (parent != null); 2953 } 2954 } 2955 2956 /** 2957 * Don't call or override this method. It is used for the implementation of 2958 * the view hierarchy. 2959 * 2960 * This implementation returns null if this ViewGroup does not have a parent, 2961 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2962 * does not intersect with this ViewGroup's bounds. 2963 */ 2964 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2965 if (ViewDebug.TRACE_HIERARCHY) { 2966 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2967 } 2968 2969 if ((mPrivateFlags & DRAWN) == DRAWN) { 2970 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2971 FLAG_OPTIMIZE_INVALIDATE) { 2972 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2973 location[CHILD_TOP_INDEX] - mScrollY); 2974 2975 final int left = mLeft; 2976 final int top = mTop; 2977 2978 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2979 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2980 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2981 2982 location[CHILD_LEFT_INDEX] = left; 2983 location[CHILD_TOP_INDEX] = top; 2984 2985 return mParent; 2986 } 2987 } else { 2988 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2989 2990 location[CHILD_LEFT_INDEX] = mLeft; 2991 location[CHILD_TOP_INDEX] = mTop; 2992 2993 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2994 mBottom - location[CHILD_TOP_INDEX]); 2995 2996 return mParent; 2997 } 2998 } 2999 3000 return null; 3001 } 3002 3003 /** 3004 * Offset a rectangle that is in a descendant's coordinate 3005 * space into our coordinate space. 3006 * @param descendant A descendant of this view 3007 * @param rect A rectangle defined in descendant's coordinate space. 3008 */ 3009 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 3010 offsetRectBetweenParentAndChild(descendant, rect, true, false); 3011 } 3012 3013 /** 3014 * Offset a rectangle that is in our coordinate space into an ancestor's 3015 * coordinate space. 3016 * @param descendant A descendant of this view 3017 * @param rect A rectangle defined in descendant's coordinate space. 3018 */ 3019 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 3020 offsetRectBetweenParentAndChild(descendant, rect, false, false); 3021 } 3022 3023 /** 3024 * Helper method that offsets a rect either from parent to descendant or 3025 * descendant to parent. 3026 */ 3027 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 3028 boolean offsetFromChildToParent, boolean clipToBounds) { 3029 3030 // already in the same coord system :) 3031 if (descendant == this) { 3032 return; 3033 } 3034 3035 ViewParent theParent = descendant.mParent; 3036 3037 // search and offset up to the parent 3038 while ((theParent != null) 3039 && (theParent instanceof View) 3040 && (theParent != this)) { 3041 3042 if (offsetFromChildToParent) { 3043 rect.offset(descendant.mLeft - descendant.mScrollX, 3044 descendant.mTop - descendant.mScrollY); 3045 if (clipToBounds) { 3046 View p = (View) theParent; 3047 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3048 } 3049 } else { 3050 if (clipToBounds) { 3051 View p = (View) theParent; 3052 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 3053 } 3054 rect.offset(descendant.mScrollX - descendant.mLeft, 3055 descendant.mScrollY - descendant.mTop); 3056 } 3057 3058 descendant = (View) theParent; 3059 theParent = descendant.mParent; 3060 } 3061 3062 // now that we are up to this view, need to offset one more time 3063 // to get into our coordinate space 3064 if (theParent == this) { 3065 if (offsetFromChildToParent) { 3066 rect.offset(descendant.mLeft - descendant.mScrollX, 3067 descendant.mTop - descendant.mScrollY); 3068 } else { 3069 rect.offset(descendant.mScrollX - descendant.mLeft, 3070 descendant.mScrollY - descendant.mTop); 3071 } 3072 } else { 3073 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3074 } 3075 } 3076 3077 /** 3078 * Offset the vertical location of all children of this view by the specified number of pixels. 3079 * 3080 * @param offset the number of pixels to offset 3081 * 3082 * @hide 3083 */ 3084 public void offsetChildrenTopAndBottom(int offset) { 3085 final int count = mChildrenCount; 3086 final View[] children = mChildren; 3087 3088 for (int i = 0; i < count; i++) { 3089 final View v = children[i]; 3090 v.mTop += offset; 3091 v.mBottom += offset; 3092 } 3093 } 3094 3095 /** 3096 * {@inheritDoc} 3097 */ 3098 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3099 int dx = child.mLeft - mScrollX; 3100 int dy = child.mTop - mScrollY; 3101 if (offset != null) { 3102 offset.x += dx; 3103 offset.y += dy; 3104 } 3105 r.offset(dx, dy); 3106 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3107 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3108 } 3109 3110 /** 3111 * {@inheritDoc} 3112 */ 3113 @Override 3114 protected abstract void onLayout(boolean changed, 3115 int l, int t, int r, int b); 3116 3117 /** 3118 * Indicates whether the view group has the ability to animate its children 3119 * after the first layout. 3120 * 3121 * @return true if the children can be animated, false otherwise 3122 */ 3123 protected boolean canAnimate() { 3124 return mLayoutAnimationController != null; 3125 } 3126 3127 /** 3128 * Runs the layout animation. Calling this method triggers a relayout of 3129 * this view group. 3130 */ 3131 public void startLayoutAnimation() { 3132 if (mLayoutAnimationController != null) { 3133 mGroupFlags |= FLAG_RUN_ANIMATION; 3134 requestLayout(); 3135 } 3136 } 3137 3138 /** 3139 * Schedules the layout animation to be played after the next layout pass 3140 * of this view group. This can be used to restart the layout animation 3141 * when the content of the view group changes or when the activity is 3142 * paused and resumed. 3143 */ 3144 public void scheduleLayoutAnimation() { 3145 mGroupFlags |= FLAG_RUN_ANIMATION; 3146 } 3147 3148 /** 3149 * Sets the layout animation controller used to animate the group's 3150 * children after the first layout. 3151 * 3152 * @param controller the animation controller 3153 */ 3154 public void setLayoutAnimation(LayoutAnimationController controller) { 3155 mLayoutAnimationController = controller; 3156 if (mLayoutAnimationController != null) { 3157 mGroupFlags |= FLAG_RUN_ANIMATION; 3158 } 3159 } 3160 3161 /** 3162 * Returns the layout animation controller used to animate the group's 3163 * children. 3164 * 3165 * @return the current animation controller 3166 */ 3167 public LayoutAnimationController getLayoutAnimation() { 3168 return mLayoutAnimationController; 3169 } 3170 3171 /** 3172 * Indicates whether the children's drawing cache is used during a layout 3173 * animation. By default, the drawing cache is enabled but this will prevent 3174 * nested layout animations from working. To nest animations, you must disable 3175 * the cache. 3176 * 3177 * @return true if the animation cache is enabled, false otherwise 3178 * 3179 * @see #setAnimationCacheEnabled(boolean) 3180 * @see View#setDrawingCacheEnabled(boolean) 3181 */ 3182 @ViewDebug.ExportedProperty 3183 public boolean isAnimationCacheEnabled() { 3184 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3185 } 3186 3187 /** 3188 * Enables or disables the children's drawing cache during a layout animation. 3189 * By default, the drawing cache is enabled but this will prevent nested 3190 * layout animations from working. To nest animations, you must disable the 3191 * cache. 3192 * 3193 * @param enabled true to enable the animation cache, false otherwise 3194 * 3195 * @see #isAnimationCacheEnabled() 3196 * @see View#setDrawingCacheEnabled(boolean) 3197 */ 3198 public void setAnimationCacheEnabled(boolean enabled) { 3199 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3200 } 3201 3202 /** 3203 * Indicates whether this ViewGroup will always try to draw its children using their 3204 * drawing cache. By default this property is enabled. 3205 * 3206 * @return true if the animation cache is enabled, false otherwise 3207 * 3208 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3209 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3210 * @see View#setDrawingCacheEnabled(boolean) 3211 */ 3212 @ViewDebug.ExportedProperty(category = "drawing") 3213 public boolean isAlwaysDrawnWithCacheEnabled() { 3214 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3215 } 3216 3217 /** 3218 * Indicates whether this ViewGroup will always try to draw its children using their 3219 * drawing cache. This property can be set to true when the cache rendering is 3220 * slightly different from the children's normal rendering. Renderings can be different, 3221 * for instance, when the cache's quality is set to low. 3222 * 3223 * When this property is disabled, the ViewGroup will use the drawing cache of its 3224 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3225 * when to start using the drawing cache and when to stop using it. 3226 * 3227 * @param always true to always draw with the drawing cache, false otherwise 3228 * 3229 * @see #isAlwaysDrawnWithCacheEnabled() 3230 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3231 * @see View#setDrawingCacheEnabled(boolean) 3232 * @see View#setDrawingCacheQuality(int) 3233 */ 3234 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3235 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3236 } 3237 3238 /** 3239 * Indicates whether the ViewGroup is currently drawing its children using 3240 * their drawing cache. 3241 * 3242 * @return true if children should be drawn with their cache, false otherwise 3243 * 3244 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3245 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3246 */ 3247 @ViewDebug.ExportedProperty(category = "drawing") 3248 protected boolean isChildrenDrawnWithCacheEnabled() { 3249 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3250 } 3251 3252 /** 3253 * Tells the ViewGroup to draw its children using their drawing cache. This property 3254 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3255 * will be used only if it has been enabled. 3256 * 3257 * Subclasses should call this method to start and stop using the drawing cache when 3258 * they perform performance sensitive operations, like scrolling or animating. 3259 * 3260 * @param enabled true if children should be drawn with their cache, false otherwise 3261 * 3262 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3263 * @see #isChildrenDrawnWithCacheEnabled() 3264 */ 3265 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3266 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3267 } 3268 3269 /** 3270 * Indicates whether the ViewGroup is drawing its children in the order defined by 3271 * {@link #getChildDrawingOrder(int, int)}. 3272 * 3273 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3274 * false otherwise 3275 * 3276 * @see #setChildrenDrawingOrderEnabled(boolean) 3277 * @see #getChildDrawingOrder(int, int) 3278 */ 3279 @ViewDebug.ExportedProperty(category = "drawing") 3280 protected boolean isChildrenDrawingOrderEnabled() { 3281 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3282 } 3283 3284 /** 3285 * Tells the ViewGroup whether to draw its children in the order defined by the method 3286 * {@link #getChildDrawingOrder(int, int)}. 3287 * 3288 * @param enabled true if the order of the children when drawing is determined by 3289 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3290 * 3291 * @see #isChildrenDrawingOrderEnabled() 3292 * @see #getChildDrawingOrder(int, int) 3293 */ 3294 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3295 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3296 } 3297 3298 private void setBooleanFlag(int flag, boolean value) { 3299 if (value) { 3300 mGroupFlags |= flag; 3301 } else { 3302 mGroupFlags &= ~flag; 3303 } 3304 } 3305 3306 /** 3307 * Returns an integer indicating what types of drawing caches are kept in memory. 3308 * 3309 * @see #setPersistentDrawingCache(int) 3310 * @see #setAnimationCacheEnabled(boolean) 3311 * 3312 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3313 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3314 * and {@link #PERSISTENT_ALL_CACHES} 3315 */ 3316 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3317 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3318 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3319 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3320 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3321 }) 3322 public int getPersistentDrawingCache() { 3323 return mPersistentDrawingCache; 3324 } 3325 3326 /** 3327 * Indicates what types of drawing caches should be kept in memory after 3328 * they have been created. 3329 * 3330 * @see #getPersistentDrawingCache() 3331 * @see #setAnimationCacheEnabled(boolean) 3332 * 3333 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3334 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3335 * and {@link #PERSISTENT_ALL_CACHES} 3336 */ 3337 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3338 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3339 } 3340 3341 /** 3342 * Returns a new set of layout parameters based on the supplied attributes set. 3343 * 3344 * @param attrs the attributes to build the layout parameters from 3345 * 3346 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3347 * of its descendants 3348 */ 3349 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3350 return new LayoutParams(getContext(), attrs); 3351 } 3352 3353 /** 3354 * Returns a safe set of layout parameters based on the supplied layout params. 3355 * When a ViewGroup is passed a View whose layout params do not pass the test of 3356 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3357 * is invoked. This method should return a new set of layout params suitable for 3358 * this ViewGroup, possibly by copying the appropriate attributes from the 3359 * specified set of layout params. 3360 * 3361 * @param p The layout parameters to convert into a suitable set of layout parameters 3362 * for this ViewGroup. 3363 * 3364 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3365 * of its descendants 3366 */ 3367 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3368 return p; 3369 } 3370 3371 /** 3372 * Returns a set of default layout parameters. These parameters are requested 3373 * when the View passed to {@link #addView(View)} has no layout parameters 3374 * already set. If null is returned, an exception is thrown from addView. 3375 * 3376 * @return a set of default layout parameters or null 3377 */ 3378 protected LayoutParams generateDefaultLayoutParams() { 3379 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3380 } 3381 3382 /** 3383 * @hide 3384 */ 3385 @Override 3386 protected boolean dispatchConsistencyCheck(int consistency) { 3387 boolean result = super.dispatchConsistencyCheck(consistency); 3388 3389 final int count = mChildrenCount; 3390 final View[] children = mChildren; 3391 for (int i = 0; i < count; i++) { 3392 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3393 } 3394 3395 return result; 3396 } 3397 3398 /** 3399 * @hide 3400 */ 3401 @Override 3402 protected boolean onConsistencyCheck(int consistency) { 3403 boolean result = super.onConsistencyCheck(consistency); 3404 3405 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3406 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3407 3408 if (checkLayout) { 3409 final int count = mChildrenCount; 3410 final View[] children = mChildren; 3411 for (int i = 0; i < count; i++) { 3412 if (children[i].getParent() != this) { 3413 result = false; 3414 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3415 "View " + children[i] + " has no parent/a parent that is not " + this); 3416 } 3417 } 3418 } 3419 3420 if (checkDrawing) { 3421 // If this group is dirty, check that the parent is dirty as well 3422 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3423 final ViewParent parent = getParent(); 3424 if (parent != null && !(parent instanceof ViewRoot)) { 3425 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3426 result = false; 3427 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3428 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3429 } 3430 } 3431 } 3432 } 3433 3434 return result; 3435 } 3436 3437 /** 3438 * {@inheritDoc} 3439 */ 3440 @Override 3441 protected void debug(int depth) { 3442 super.debug(depth); 3443 String output; 3444 3445 if (mFocused != null) { 3446 output = debugIndent(depth); 3447 output += "mFocused"; 3448 Log.d(VIEW_LOG_TAG, output); 3449 } 3450 if (mChildrenCount != 0) { 3451 output = debugIndent(depth); 3452 output += "{"; 3453 Log.d(VIEW_LOG_TAG, output); 3454 } 3455 int count = mChildrenCount; 3456 for (int i = 0; i < count; i++) { 3457 View child = mChildren[i]; 3458 child.debug(depth + 1); 3459 } 3460 3461 if (mChildrenCount != 0) { 3462 output = debugIndent(depth); 3463 output += "}"; 3464 Log.d(VIEW_LOG_TAG, output); 3465 } 3466 } 3467 3468 /** 3469 * Returns the position in the group of the specified child view. 3470 * 3471 * @param child the view for which to get the position 3472 * @return a positive integer representing the position of the view in the 3473 * group, or -1 if the view does not exist in the group 3474 */ 3475 public int indexOfChild(View child) { 3476 final int count = mChildrenCount; 3477 final View[] children = mChildren; 3478 for (int i = 0; i < count; i++) { 3479 if (children[i] == child) { 3480 return i; 3481 } 3482 } 3483 return -1; 3484 } 3485 3486 /** 3487 * Returns the number of children in the group. 3488 * 3489 * @return a positive integer representing the number of children in 3490 * the group 3491 */ 3492 public int getChildCount() { 3493 return mChildrenCount; 3494 } 3495 3496 /** 3497 * Returns the view at the specified position in the group. 3498 * 3499 * @param index the position at which to get the view from 3500 * @return the view at the specified position or null if the position 3501 * does not exist within the group 3502 */ 3503 public View getChildAt(int index) { 3504 try { 3505 return mChildren[index]; 3506 } catch (IndexOutOfBoundsException ex) { 3507 return null; 3508 } 3509 } 3510 3511 /** 3512 * Ask all of the children of this view to measure themselves, taking into 3513 * account both the MeasureSpec requirements for this view and its padding. 3514 * We skip children that are in the GONE state The heavy lifting is done in 3515 * getChildMeasureSpec. 3516 * 3517 * @param widthMeasureSpec The width requirements for this view 3518 * @param heightMeasureSpec The height requirements for this view 3519 */ 3520 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3521 final int size = mChildrenCount; 3522 final View[] children = mChildren; 3523 for (int i = 0; i < size; ++i) { 3524 final View child = children[i]; 3525 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3526 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3527 } 3528 } 3529 } 3530 3531 /** 3532 * Ask one of the children of this view to measure itself, taking into 3533 * account both the MeasureSpec requirements for this view and its padding. 3534 * The heavy lifting is done in getChildMeasureSpec. 3535 * 3536 * @param child The child to measure 3537 * @param parentWidthMeasureSpec The width requirements for this view 3538 * @param parentHeightMeasureSpec The height requirements for this view 3539 */ 3540 protected void measureChild(View child, int parentWidthMeasureSpec, 3541 int parentHeightMeasureSpec) { 3542 final LayoutParams lp = child.getLayoutParams(); 3543 3544 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3545 mPaddingLeft + mPaddingRight, lp.width); 3546 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3547 mPaddingTop + mPaddingBottom, lp.height); 3548 3549 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3550 } 3551 3552 /** 3553 * Ask one of the children of this view to measure itself, taking into 3554 * account both the MeasureSpec requirements for this view and its padding 3555 * and margins. The child must have MarginLayoutParams The heavy lifting is 3556 * done in getChildMeasureSpec. 3557 * 3558 * @param child The child to measure 3559 * @param parentWidthMeasureSpec The width requirements for this view 3560 * @param widthUsed Extra space that has been used up by the parent 3561 * horizontally (possibly by other children of the parent) 3562 * @param parentHeightMeasureSpec The height requirements for this view 3563 * @param heightUsed Extra space that has been used up by the parent 3564 * vertically (possibly by other children of the parent) 3565 */ 3566 protected void measureChildWithMargins(View child, 3567 int parentWidthMeasureSpec, int widthUsed, 3568 int parentHeightMeasureSpec, int heightUsed) { 3569 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3570 3571 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3572 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3573 + widthUsed, lp.width); 3574 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3575 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3576 + heightUsed, lp.height); 3577 3578 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3579 } 3580 3581 /** 3582 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3583 * pass to a particular child. This method figures out the right MeasureSpec 3584 * for one dimension (height or width) of one child view. 3585 * 3586 * The goal is to combine information from our MeasureSpec with the 3587 * LayoutParams of the child to get the best possible results. For example, 3588 * if the this view knows its size (because its MeasureSpec has a mode of 3589 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3590 * to be the same size as the parent, the parent should ask the child to 3591 * layout given an exact size. 3592 * 3593 * @param spec The requirements for this view 3594 * @param padding The padding of this view for the current dimension and 3595 * margins, if applicable 3596 * @param childDimension How big the child wants to be in the current 3597 * dimension 3598 * @return a MeasureSpec integer for the child 3599 */ 3600 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3601 int specMode = MeasureSpec.getMode(spec); 3602 int specSize = MeasureSpec.getSize(spec); 3603 3604 int size = Math.max(0, specSize - padding); 3605 3606 int resultSize = 0; 3607 int resultMode = 0; 3608 3609 switch (specMode) { 3610 // Parent has imposed an exact size on us 3611 case MeasureSpec.EXACTLY: 3612 if (childDimension >= 0) { 3613 resultSize = childDimension; 3614 resultMode = MeasureSpec.EXACTLY; 3615 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3616 // Child wants to be our size. So be it. 3617 resultSize = size; 3618 resultMode = MeasureSpec.EXACTLY; 3619 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3620 // Child wants to determine its own size. It can't be 3621 // bigger than us. 3622 resultSize = size; 3623 resultMode = MeasureSpec.AT_MOST; 3624 } 3625 break; 3626 3627 // Parent has imposed a maximum size on us 3628 case MeasureSpec.AT_MOST: 3629 if (childDimension >= 0) { 3630 // Child wants a specific size... so be it 3631 resultSize = childDimension; 3632 resultMode = MeasureSpec.EXACTLY; 3633 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3634 // Child wants to be our size, but our size is not fixed. 3635 // Constrain child to not be bigger than us. 3636 resultSize = size; 3637 resultMode = MeasureSpec.AT_MOST; 3638 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3639 // Child wants to determine its own size. It can't be 3640 // bigger than us. 3641 resultSize = size; 3642 resultMode = MeasureSpec.AT_MOST; 3643 } 3644 break; 3645 3646 // Parent asked to see how big we want to be 3647 case MeasureSpec.UNSPECIFIED: 3648 if (childDimension >= 0) { 3649 // Child wants a specific size... let him have it 3650 resultSize = childDimension; 3651 resultMode = MeasureSpec.EXACTLY; 3652 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3653 // Child wants to be our size... find out how big it should 3654 // be 3655 resultSize = 0; 3656 resultMode = MeasureSpec.UNSPECIFIED; 3657 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3658 // Child wants to determine its own size.... find out how 3659 // big it should be 3660 resultSize = 0; 3661 resultMode = MeasureSpec.UNSPECIFIED; 3662 } 3663 break; 3664 } 3665 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3666 } 3667 3668 3669 /** 3670 * Removes any pending animations for views that have been removed. Call 3671 * this if you don't want animations for exiting views to stack up. 3672 */ 3673 public void clearDisappearingChildren() { 3674 if (mDisappearingChildren != null) { 3675 mDisappearingChildren.clear(); 3676 } 3677 } 3678 3679 /** 3680 * Add a view which is removed from mChildren but still needs animation 3681 * 3682 * @param v View to add 3683 */ 3684 private void addDisappearingView(View v) { 3685 ArrayList<View> disappearingChildren = mDisappearingChildren; 3686 3687 if (disappearingChildren == null) { 3688 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3689 } 3690 3691 disappearingChildren.add(v); 3692 } 3693 3694 /** 3695 * Cleanup a view when its animation is done. This may mean removing it from 3696 * the list of disappearing views. 3697 * 3698 * @param view The view whose animation has finished 3699 * @param animation The animation, cannot be null 3700 */ 3701 private void finishAnimatingView(final View view, Animation animation) { 3702 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3703 if (disappearingChildren != null) { 3704 if (disappearingChildren.contains(view)) { 3705 disappearingChildren.remove(view); 3706 3707 if (view.mAttachInfo != null) { 3708 view.dispatchDetachedFromWindow(); 3709 } 3710 3711 view.clearAnimation(); 3712 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3713 } 3714 } 3715 3716 if (animation != null && !animation.getFillAfter()) { 3717 view.clearAnimation(); 3718 } 3719 3720 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3721 view.onAnimationEnd(); 3722 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3723 // so we'd rather be safe than sorry 3724 view.mPrivateFlags &= ~ANIMATION_STARTED; 3725 // Draw one more frame after the animation is done 3726 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3727 } 3728 } 3729 3730 private LayoutTransition.TransitionListener mLayoutTransitionListener = 3731 new LayoutTransition.TransitionListener() { 3732 @Override 3733 public void startTransition(LayoutTransition transition, ViewGroup container, 3734 View view, int transitionType) { 3735 // We only care about disappearing items, since we need special logic to keep 3736 // those items visible after they've been 'removed' 3737 if (transitionType == LayoutTransition.DISAPPEARING) { 3738 if (mTransitioningViews == null) { 3739 mTransitioningViews = new ArrayList<View>(); 3740 } 3741 mTransitioningViews.add(view); 3742 } 3743 } 3744 3745 @Override 3746 public void endTransition(LayoutTransition transition, ViewGroup container, 3747 View view, int transitionType) { 3748 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 3749 mTransitioningViews.remove(view); 3750 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3751 if (disappearingChildren != null && disappearingChildren.contains(view)) { 3752 disappearingChildren.remove(view); 3753 if (view.mAttachInfo != null) { 3754 view.dispatchDetachedFromWindow(); 3755 } 3756 if (view.mParent != null) { 3757 view.mParent = null; 3758 } 3759 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3760 } 3761 } 3762 } 3763 }; 3764 3765 /** 3766 * {@inheritDoc} 3767 */ 3768 @Override 3769 public boolean gatherTransparentRegion(Region region) { 3770 // If no transparent regions requested, we are always opaque. 3771 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3772 if (meOpaque && region == null) { 3773 // The caller doesn't care about the region, so stop now. 3774 return true; 3775 } 3776 super.gatherTransparentRegion(region); 3777 final View[] children = mChildren; 3778 final int count = mChildrenCount; 3779 boolean noneOfTheChildrenAreTransparent = true; 3780 for (int i = 0; i < count; i++) { 3781 final View child = children[i]; 3782 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3783 if (!child.gatherTransparentRegion(region)) { 3784 noneOfTheChildrenAreTransparent = false; 3785 } 3786 } 3787 } 3788 return meOpaque || noneOfTheChildrenAreTransparent; 3789 } 3790 3791 /** 3792 * {@inheritDoc} 3793 */ 3794 public void requestTransparentRegion(View child) { 3795 if (child != null) { 3796 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3797 if (mParent != null) { 3798 mParent.requestTransparentRegion(this); 3799 } 3800 } 3801 } 3802 3803 3804 @Override 3805 protected boolean fitSystemWindows(Rect insets) { 3806 boolean done = super.fitSystemWindows(insets); 3807 if (!done) { 3808 final int count = mChildrenCount; 3809 final View[] children = mChildren; 3810 for (int i = 0; i < count; i++) { 3811 done = children[i].fitSystemWindows(insets); 3812 if (done) { 3813 break; 3814 } 3815 } 3816 } 3817 return done; 3818 } 3819 3820 /** 3821 * Returns the animation listener to which layout animation events are 3822 * sent. 3823 * 3824 * @return an {@link android.view.animation.Animation.AnimationListener} 3825 */ 3826 public Animation.AnimationListener getLayoutAnimationListener() { 3827 return mAnimationListener; 3828 } 3829 3830 @Override 3831 protected void drawableStateChanged() { 3832 super.drawableStateChanged(); 3833 3834 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3835 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3836 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3837 + " child has duplicateParentState set to true"); 3838 } 3839 3840 final View[] children = mChildren; 3841 final int count = mChildrenCount; 3842 3843 for (int i = 0; i < count; i++) { 3844 final View child = children[i]; 3845 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3846 child.refreshDrawableState(); 3847 } 3848 } 3849 } 3850 } 3851 3852 @Override 3853 protected int[] onCreateDrawableState(int extraSpace) { 3854 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3855 return super.onCreateDrawableState(extraSpace); 3856 } 3857 3858 int need = 0; 3859 int n = getChildCount(); 3860 for (int i = 0; i < n; i++) { 3861 int[] childState = getChildAt(i).getDrawableState(); 3862 3863 if (childState != null) { 3864 need += childState.length; 3865 } 3866 } 3867 3868 int[] state = super.onCreateDrawableState(extraSpace + need); 3869 3870 for (int i = 0; i < n; i++) { 3871 int[] childState = getChildAt(i).getDrawableState(); 3872 3873 if (childState != null) { 3874 state = mergeDrawableStates(state, childState); 3875 } 3876 } 3877 3878 return state; 3879 } 3880 3881 /** 3882 * Sets whether this ViewGroup's drawable states also include 3883 * its children's drawable states. This is used, for example, to 3884 * make a group appear to be focused when its child EditText or button 3885 * is focused. 3886 */ 3887 public void setAddStatesFromChildren(boolean addsStates) { 3888 if (addsStates) { 3889 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3890 } else { 3891 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3892 } 3893 3894 refreshDrawableState(); 3895 } 3896 3897 /** 3898 * Returns whether this ViewGroup's drawable states also include 3899 * its children's drawable states. This is used, for example, to 3900 * make a group appear to be focused when its child EditText or button 3901 * is focused. 3902 */ 3903 public boolean addStatesFromChildren() { 3904 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3905 } 3906 3907 /** 3908 * If {link #addStatesFromChildren} is true, refreshes this group's 3909 * drawable state (to include the states from its children). 3910 */ 3911 public void childDrawableStateChanged(View child) { 3912 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3913 refreshDrawableState(); 3914 } 3915 } 3916 3917 /** 3918 * Specifies the animation listener to which layout animation events must 3919 * be sent. Only 3920 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3921 * and 3922 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3923 * are invoked. 3924 * 3925 * @param animationListener the layout animation listener 3926 */ 3927 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3928 mAnimationListener = animationListener; 3929 } 3930 3931 /** 3932 * LayoutParams are used by views to tell their parents how they want to be 3933 * laid out. See 3934 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3935 * for a list of all child view attributes that this class supports. 3936 * 3937 * <p> 3938 * The base LayoutParams class just describes how big the view wants to be 3939 * for both width and height. For each dimension, it can specify one of: 3940 * <ul> 3941 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 3942 * means that the view wants to be as big as its parent (minus padding) 3943 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3944 * to enclose its content (plus padding) 3945 * <li> an exact number 3946 * </ul> 3947 * There are subclasses of LayoutParams for different subclasses of 3948 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3949 * LayoutParams which adds an X and Y value. 3950 * 3951 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3952 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3953 */ 3954 public static class LayoutParams { 3955 /** 3956 * Special value for the height or width requested by a View. 3957 * FILL_PARENT means that the view wants to be as big as its parent, 3958 * minus the parent's padding, if any. This value is deprecated 3959 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 3960 */ 3961 @SuppressWarnings({"UnusedDeclaration"}) 3962 @Deprecated 3963 public static final int FILL_PARENT = -1; 3964 3965 /** 3966 * Special value for the height or width requested by a View. 3967 * MATCH_PARENT means that the view wants to be as big as its parent, 3968 * minus the parent's padding, if any. Introduced in API Level 8. 3969 */ 3970 public static final int MATCH_PARENT = -1; 3971 3972 /** 3973 * Special value for the height or width requested by a View. 3974 * WRAP_CONTENT means that the view wants to be just large enough to fit 3975 * its own internal content, taking its own padding into account. 3976 */ 3977 public static final int WRAP_CONTENT = -2; 3978 3979 /** 3980 * Information about how wide the view wants to be. Can be one of the 3981 * constants FILL_PARENT (replaced by MATCH_PARENT , 3982 * in API Level 8) or WRAP_CONTENT. or an exact size. 3983 */ 3984 @ViewDebug.ExportedProperty(category = "layout", mapping = { 3985 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3986 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3987 }) 3988 public int width; 3989 3990 /** 3991 * Information about how tall the view wants to be. Can be one of the 3992 * constants FILL_PARENT (replaced by MATCH_PARENT , 3993 * in API Level 8) or WRAP_CONTENT. or an exact size. 3994 */ 3995 @ViewDebug.ExportedProperty(category = "layout", mapping = { 3996 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3997 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3998 }) 3999 public int height; 4000 4001 /** 4002 * Used to animate layouts. 4003 */ 4004 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 4005 4006 /** 4007 * Creates a new set of layout parameters. The values are extracted from 4008 * the supplied attributes set and context. The XML attributes mapped 4009 * to this set of layout parameters are: 4010 * 4011 * <ul> 4012 * <li><code>layout_width</code>: the width, either an exact value, 4013 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4014 * {@link #MATCH_PARENT} in API Level 8)</li> 4015 * <li><code>layout_height</code>: the height, either an exact value, 4016 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 4017 * {@link #MATCH_PARENT} in API Level 8)</li> 4018 * </ul> 4019 * 4020 * @param c the application environment 4021 * @param attrs the set of attributes from which to extract the layout 4022 * parameters' values 4023 */ 4024 public LayoutParams(Context c, AttributeSet attrs) { 4025 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 4026 setBaseAttributes(a, 4027 R.styleable.ViewGroup_Layout_layout_width, 4028 R.styleable.ViewGroup_Layout_layout_height); 4029 a.recycle(); 4030 } 4031 4032 /** 4033 * Creates a new set of layout parameters with the specified width 4034 * and height. 4035 * 4036 * @param width the width, either {@link #WRAP_CONTENT}, 4037 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4038 * API Level 8), or a fixed size in pixels 4039 * @param height the height, either {@link #WRAP_CONTENT}, 4040 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 4041 * API Level 8), or a fixed size in pixels 4042 */ 4043 public LayoutParams(int width, int height) { 4044 this.width = width; 4045 this.height = height; 4046 } 4047 4048 /** 4049 * Copy constructor. Clones the width and height values of the source. 4050 * 4051 * @param source The layout params to copy from. 4052 */ 4053 public LayoutParams(LayoutParams source) { 4054 this.width = source.width; 4055 this.height = source.height; 4056 } 4057 4058 /** 4059 * Used internally by MarginLayoutParams. 4060 * @hide 4061 */ 4062 LayoutParams() { 4063 } 4064 4065 /** 4066 * Extracts the layout parameters from the supplied attributes. 4067 * 4068 * @param a the style attributes to extract the parameters from 4069 * @param widthAttr the identifier of the width attribute 4070 * @param heightAttr the identifier of the height attribute 4071 */ 4072 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 4073 width = a.getLayoutDimension(widthAttr, "layout_width"); 4074 height = a.getLayoutDimension(heightAttr, "layout_height"); 4075 } 4076 4077 /** 4078 * Returns a String representation of this set of layout parameters. 4079 * 4080 * @param output the String to prepend to the internal representation 4081 * @return a String with the following format: output + 4082 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 4083 * 4084 * @hide 4085 */ 4086 public String debug(String output) { 4087 return output + "ViewGroup.LayoutParams={ width=" 4088 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 4089 } 4090 4091 /** 4092 * Converts the specified size to a readable String. 4093 * 4094 * @param size the size to convert 4095 * @return a String instance representing the supplied size 4096 * 4097 * @hide 4098 */ 4099 protected static String sizeToString(int size) { 4100 if (size == WRAP_CONTENT) { 4101 return "wrap-content"; 4102 } 4103 if (size == MATCH_PARENT) { 4104 return "match-parent"; 4105 } 4106 return String.valueOf(size); 4107 } 4108 } 4109 4110 /** 4111 * Per-child layout information for layouts that support margins. 4112 * See 4113 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4114 * for a list of all child view attributes that this class supports. 4115 */ 4116 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4117 /** 4118 * The left margin in pixels of the child. 4119 */ 4120 @ViewDebug.ExportedProperty(category = "layout") 4121 public int leftMargin; 4122 4123 /** 4124 * The top margin in pixels of the child. 4125 */ 4126 @ViewDebug.ExportedProperty(category = "layout") 4127 public int topMargin; 4128 4129 /** 4130 * The right margin in pixels of the child. 4131 */ 4132 @ViewDebug.ExportedProperty(category = "layout") 4133 public int rightMargin; 4134 4135 /** 4136 * The bottom margin in pixels of the child. 4137 */ 4138 @ViewDebug.ExportedProperty(category = "layout") 4139 public int bottomMargin; 4140 4141 /** 4142 * Creates a new set of layout parameters. The values are extracted from 4143 * the supplied attributes set and context. 4144 * 4145 * @param c the application environment 4146 * @param attrs the set of attributes from which to extract the layout 4147 * parameters' values 4148 */ 4149 public MarginLayoutParams(Context c, AttributeSet attrs) { 4150 super(); 4151 4152 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4153 setBaseAttributes(a, 4154 R.styleable.ViewGroup_MarginLayout_layout_width, 4155 R.styleable.ViewGroup_MarginLayout_layout_height); 4156 4157 int margin = a.getDimensionPixelSize( 4158 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4159 if (margin >= 0) { 4160 leftMargin = margin; 4161 topMargin = margin; 4162 rightMargin= margin; 4163 bottomMargin = margin; 4164 } else { 4165 leftMargin = a.getDimensionPixelSize( 4166 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4167 topMargin = a.getDimensionPixelSize( 4168 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4169 rightMargin = a.getDimensionPixelSize( 4170 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4171 bottomMargin = a.getDimensionPixelSize( 4172 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4173 } 4174 4175 a.recycle(); 4176 } 4177 4178 /** 4179 * {@inheritDoc} 4180 */ 4181 public MarginLayoutParams(int width, int height) { 4182 super(width, height); 4183 } 4184 4185 /** 4186 * Copy constructor. Clones the width, height and margin values of the source. 4187 * 4188 * @param source The layout params to copy from. 4189 */ 4190 public MarginLayoutParams(MarginLayoutParams source) { 4191 this.width = source.width; 4192 this.height = source.height; 4193 4194 this.leftMargin = source.leftMargin; 4195 this.topMargin = source.topMargin; 4196 this.rightMargin = source.rightMargin; 4197 this.bottomMargin = source.bottomMargin; 4198 } 4199 4200 /** 4201 * {@inheritDoc} 4202 */ 4203 public MarginLayoutParams(LayoutParams source) { 4204 super(source); 4205 } 4206 4207 /** 4208 * Sets the margins, in pixels. 4209 * 4210 * @param left the left margin size 4211 * @param top the top margin size 4212 * @param right the right margin size 4213 * @param bottom the bottom margin size 4214 * 4215 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4216 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4217 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4218 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4219 */ 4220 public void setMargins(int left, int top, int right, int bottom) { 4221 leftMargin = left; 4222 topMargin = top; 4223 rightMargin = right; 4224 bottomMargin = bottom; 4225 } 4226 } 4227 4228 private static class SplitMotionTargets { 4229 private SparseArray<View> mTargets; 4230 private TargetInfo[] mUniqueTargets; 4231 private int mUniqueTargetCount; 4232 private MotionEvent.PointerCoords[] mPointerCoords; 4233 private int[] mPointerIds; 4234 4235 private static final int INITIAL_UNIQUE_MOTION_TARGETS_SIZE = 5; 4236 private static final int INITIAL_BUCKET_SIZE = 5; 4237 4238 public SplitMotionTargets() { 4239 mTargets = new SparseArray<View>(); 4240 mUniqueTargets = new TargetInfo[INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4241 mPointerIds = new int[INITIAL_BUCKET_SIZE]; 4242 mPointerCoords = new MotionEvent.PointerCoords[INITIAL_BUCKET_SIZE]; 4243 for (int i = 0; i < INITIAL_BUCKET_SIZE; i++) { 4244 mPointerCoords[i] = new MotionEvent.PointerCoords(); 4245 } 4246 } 4247 4248 public void clear() { 4249 mTargets.clear(); 4250 final int count = mUniqueTargetCount; 4251 for (int i = 0; i < count; i++) { 4252 mUniqueTargets[i].recycle(); 4253 mUniqueTargets[i] = null; 4254 } 4255 mUniqueTargetCount = 0; 4256 } 4257 4258 public void add(int pointerId, View target, long downTime) { 4259 mTargets.put(pointerId, target); 4260 4261 final int uniqueCount = mUniqueTargetCount; 4262 boolean addUnique = true; 4263 for (int i = 0; i < uniqueCount; i++) { 4264 if (mUniqueTargets[i].view == target) { 4265 addUnique = false; 4266 } 4267 } 4268 if (addUnique) { 4269 if (mUniqueTargets.length == uniqueCount) { 4270 TargetInfo[] newTargets = 4271 new TargetInfo[uniqueCount + INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4272 System.arraycopy(mUniqueTargets, 0, newTargets, 0, uniqueCount); 4273 mUniqueTargets = newTargets; 4274 } 4275 mUniqueTargets[uniqueCount] = TargetInfo.obtain(target, downTime); 4276 mUniqueTargetCount++; 4277 } 4278 } 4279 4280 public int getIdCount() { 4281 return mTargets.size(); 4282 } 4283 4284 public int getUniqueTargetCount() { 4285 return mUniqueTargetCount; 4286 } 4287 4288 public TargetInfo getUniqueTargetAt(int index) { 4289 return mUniqueTargets[index]; 4290 } 4291 4292 public View get(int id) { 4293 return mTargets.get(id); 4294 } 4295 4296 public int indexOfTarget(View target) { 4297 return mTargets.indexOfValue(target); 4298 } 4299 4300 public View targetAt(int index) { 4301 return mTargets.valueAt(index); 4302 } 4303 4304 public TargetInfo getPrimaryTarget() { 4305 if (!isEmpty()) { 4306 // Find the longest-lived target 4307 long firstTime = Long.MAX_VALUE; 4308 int firstIndex = 0; 4309 final int uniqueCount = mUniqueTargetCount; 4310 for (int i = 0; i < uniqueCount; i++) { 4311 TargetInfo info = mUniqueTargets[i]; 4312 if (info.downTime < firstTime) { 4313 firstTime = info.downTime; 4314 firstIndex = i; 4315 } 4316 } 4317 return mUniqueTargets[firstIndex]; 4318 } 4319 return null; 4320 } 4321 4322 public boolean isEmpty() { 4323 return mUniqueTargetCount == 0; 4324 } 4325 4326 public void removeById(int id) { 4327 final int index = mTargets.indexOfKey(id); 4328 removeAt(index); 4329 } 4330 4331 public void removeView(View view) { 4332 int i = 0; 4333 while (i < mTargets.size()) { 4334 if (mTargets.valueAt(i) == view) { 4335 mTargets.removeAt(i); 4336 } else { 4337 i++; 4338 } 4339 } 4340 removeUnique(view); 4341 } 4342 4343 public void removeAt(int index) { 4344 if (index < 0 || index >= mTargets.size()) { 4345 return; 4346 } 4347 4348 final View removeView = mTargets.valueAt(index); 4349 mTargets.removeAt(index); 4350 if (mTargets.indexOfValue(removeView) < 0) { 4351 removeUnique(removeView); 4352 } 4353 } 4354 4355 private void removeUnique(View removeView) { 4356 TargetInfo[] unique = mUniqueTargets; 4357 int uniqueCount = mUniqueTargetCount; 4358 for (int i = 0; i < uniqueCount; i++) { 4359 if (unique[i].view == removeView) { 4360 unique[i].recycle(); 4361 unique[i] = unique[--uniqueCount]; 4362 unique[uniqueCount] = null; 4363 break; 4364 } 4365 } 4366 4367 mUniqueTargetCount = uniqueCount; 4368 } 4369 4370 /** 4371 * Return a new (obtain()ed) MotionEvent containing only data for pointers that should 4372 * be dispatched to child. Don't forget to recycle it! 4373 */ 4374 public MotionEvent filterMotionEventForChild(MotionEvent ev, View child, long downTime) { 4375 int action = ev.getAction(); 4376 final int maskedAction = action & MotionEvent.ACTION_MASK; 4377 4378 // Only send pointer up events if this child was the target. Drop it otherwise. 4379 if (maskedAction == MotionEvent.ACTION_POINTER_UP && 4380 get(ev.getPointerId(ev.getActionIndex())) != child) { 4381 return null; 4382 } 4383 4384 int pointerCount = 0; 4385 final int idCount = getIdCount(); 4386 for (int i = 0; i < idCount; i++) { 4387 if (targetAt(i) == child) { 4388 pointerCount++; 4389 } 4390 } 4391 4392 int actionId = -1; 4393 boolean needsNewIndex = false; // True if we should fill in the action's masked index 4394 4395 // If we have a down event, it wasn't counted above. 4396 if (maskedAction == MotionEvent.ACTION_DOWN) { 4397 pointerCount++; 4398 actionId = ev.getPointerId(0); 4399 } else if (maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 4400 pointerCount++; 4401 4402 actionId = ev.getPointerId(ev.getActionIndex()); 4403 4404 if (indexOfTarget(child) < 0) { 4405 // The new action should be ACTION_DOWN if this child isn't currently getting 4406 // any events. 4407 action = MotionEvent.ACTION_DOWN; 4408 } else { 4409 // Fill in the index portion of the action later. 4410 needsNewIndex = true; 4411 } 4412 } else if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 4413 actionId = ev.getPointerId(ev.getActionIndex()); 4414 if (pointerCount == 1) { 4415 // The new action should be ACTION_UP if there's only one pointer left for 4416 // this target. 4417 action = MotionEvent.ACTION_UP; 4418 } else { 4419 // Fill in the index portion of the action later. 4420 needsNewIndex = true; 4421 } 4422 } 4423 4424 if (pointerCount == 0) { 4425 return null; 4426 } 4427 4428 // Fill the buckets with pointer data! 4429 final int eventPointerCount = ev.getPointerCount(); 4430 int bucketIndex = 0; 4431 int newActionIndex = -1; 4432 for (int evp = 0; evp < eventPointerCount; evp++) { 4433 final int id = ev.getPointerId(evp); 4434 4435 // Add this pointer to the bucket if it is new or targeted at child 4436 if (id == actionId || get(id) == child) { 4437 // Expand scratch arrays if needed 4438 if (mPointerCoords.length <= bucketIndex) { 4439 int[] pointerIds = new int[pointerCount]; 4440 MotionEvent.PointerCoords[] pointerCoords = 4441 new MotionEvent.PointerCoords[pointerCount]; 4442 for (int i = mPointerCoords.length; i < pointerCoords.length; i++) { 4443 pointerCoords[i] = new MotionEvent.PointerCoords(); 4444 } 4445 4446 System.arraycopy(mPointerCoords, 0, 4447 pointerCoords, 0, mPointerCoords.length); 4448 System.arraycopy(mPointerIds, 0, pointerIds, 0, mPointerIds.length); 4449 4450 mPointerCoords = pointerCoords; 4451 mPointerIds = pointerIds; 4452 } 4453 4454 mPointerIds[bucketIndex] = id; 4455 ev.getPointerCoords(evp, mPointerCoords[bucketIndex]); 4456 4457 if (needsNewIndex && id == actionId) { 4458 newActionIndex = bucketIndex; 4459 } 4460 4461 bucketIndex++; 4462 } 4463 } 4464 4465 // Encode the new action index if we have one 4466 if (newActionIndex >= 0) { 4467 action = (action & MotionEvent.ACTION_MASK) | 4468 (newActionIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 4469 } 4470 4471 return MotionEvent.obtain(downTime, ev.getEventTime(), 4472 action, pointerCount, mPointerIds, mPointerCoords, ev.getMetaState(), 4473 ev.getXPrecision(), ev.getYPrecision(), ev.getDeviceId(), ev.getEdgeFlags(), 4474 ev.getSource()); 4475 } 4476 4477 static class TargetInfo { 4478 public View view; 4479 public long downTime; 4480 4481 private TargetInfo mNextRecycled; 4482 4483 private static TargetInfo sRecycleBin; 4484 private static int sRecycledCount; 4485 4486 private static int MAX_RECYCLED = 15; 4487 4488 private TargetInfo() { 4489 } 4490 4491 public static TargetInfo obtain(View v, long time) { 4492 TargetInfo info; 4493 if (sRecycleBin == null) { 4494 info = new TargetInfo(); 4495 } else { 4496 info = sRecycleBin; 4497 sRecycleBin = info.mNextRecycled; 4498 sRecycledCount--; 4499 } 4500 info.view = v; 4501 info.downTime = time; 4502 return info; 4503 } 4504 4505 public void recycle() { 4506 if (sRecycledCount >= MAX_RECYCLED) { 4507 return; 4508 } 4509 mNextRecycled = sRecycleBin; 4510 sRecycleBin = this; 4511 sRecycledCount++; 4512 } 4513 } 4514 } 4515} 4516