ViewGroup.java revision 9b34d45c8f164f1d4c51538f241263dfefc0f22e
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20 21import android.content.Context; 22import android.content.res.Configuration; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Canvas; 26import android.graphics.Matrix; 27import android.graphics.Paint; 28import android.graphics.Rect; 29import android.graphics.RectF; 30import android.graphics.Region; 31import android.os.Parcelable; 32import android.os.SystemClock; 33import android.util.AttributeSet; 34import android.util.Config; 35import android.util.EventLog; 36import android.util.Log; 37import android.util.SparseArray; 38import android.view.accessibility.AccessibilityEvent; 39import android.view.animation.Animation; 40import android.view.animation.AnimationUtils; 41import android.view.animation.LayoutAnimationController; 42import android.view.animation.Transformation; 43 44import java.util.ArrayList; 45 46/** 47 * <p> 48 * A <code>ViewGroup</code> is a special view that can contain other views 49 * (called children.) The view group is the base class for layouts and views 50 * containers. This class also defines the 51 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 52 * class for layouts parameters. 53 * </p> 54 * 55 * <p> 56 * Also see {@link LayoutParams} for layout attributes. 57 * </p> 58 * 59 * @attr ref android.R.styleable#ViewGroup_clipChildren 60 * @attr ref android.R.styleable#ViewGroup_clipToPadding 61 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 62 * @attr ref android.R.styleable#ViewGroup_animationCache 63 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 64 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 65 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 66 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 67 */ 68public abstract class ViewGroup extends View implements ViewParent, ViewManager { 69 private static final boolean DBG = false; 70 71 /** 72 * Views which have been hidden or removed which need to be animated on 73 * their way out. 74 * This field should be made private, so it is hidden from the SDK. 75 * {@hide} 76 */ 77 protected ArrayList<View> mDisappearingChildren; 78 79 /** 80 * Listener used to propagate events indicating when children are added 81 * and/or removed from a view group. 82 * This field should be made private, so it is hidden from the SDK. 83 * {@hide} 84 */ 85 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 86 87 // The view contained within this ViewGroup that has or contains focus. 88 private View mFocused; 89 90 /** 91 * A Transformation used when drawing children, to 92 * apply on the child being drawn. 93 */ 94 private final Transformation mChildTransformation = new Transformation(); 95 96 /** 97 * Used to track the current invalidation region. 98 */ 99 private RectF mInvalidateRegion; 100 101 /** 102 * A Transformation used to calculate a correct 103 * invalidation area when the application is autoscaled. 104 */ 105 private Transformation mInvalidationTransformation; 106 107 // Target of Motion events 108 private View mMotionTarget; 109 110 // Targets of MotionEvents in split mode 111 private SplitMotionTargets mSplitMotionTargets; 112 113 // Layout animation 114 private LayoutAnimationController mLayoutAnimationController; 115 private Animation.AnimationListener mAnimationListener; 116 117 /** 118 * Internal flags. 119 * 120 * This field should be made private, so it is hidden from the SDK. 121 * {@hide} 122 */ 123 protected int mGroupFlags; 124 125 // When set, ViewGroup invalidates only the child's rectangle 126 // Set by default 127 private static final int FLAG_CLIP_CHILDREN = 0x1; 128 129 // When set, ViewGroup excludes the padding area from the invalidate rectangle 130 // Set by default 131 private static final int FLAG_CLIP_TO_PADDING = 0x2; 132 133 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 134 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 135 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 136 137 // When set, dispatchDraw() will run the layout animation and unset the flag 138 private static final int FLAG_RUN_ANIMATION = 0x8; 139 140 // When set, there is either no layout animation on the ViewGroup or the layout 141 // animation is over 142 // Set by default 143 private static final int FLAG_ANIMATION_DONE = 0x10; 144 145 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 146 // to clip it, even if FLAG_CLIP_TO_PADDING is set 147 private static final int FLAG_PADDING_NOT_NULL = 0x20; 148 149 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 150 // Set by default 151 private static final int FLAG_ANIMATION_CACHE = 0x40; 152 153 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 154 // layout animation; this avoid clobbering the hierarchy 155 // Automatically set when the layout animation starts, depending on the animation's 156 // characteristics 157 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 158 159 // When set, the next call to drawChild() will clear mChildTransformation's matrix 160 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 161 162 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 163 // the children's Bitmap caches if necessary 164 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 165 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 166 167 /** 168 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 169 * to get the index of the child to draw for that iteration. 170 * 171 * @hide 172 */ 173 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 174 175 /** 176 * When set, this ViewGroup supports static transformations on children; this causes 177 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 178 * invoked when a child is drawn. 179 * 180 * Any subclass overriding 181 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 182 * set this flags in {@link #mGroupFlags}. 183 * 184 * {@hide} 185 */ 186 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 187 188 // When the previous drawChild() invocation used an alpha value that was lower than 189 // 1.0 and set it in mCachePaint 190 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 191 192 /** 193 * When set, this ViewGroup's drawable states also include those 194 * of its children. 195 */ 196 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 197 198 /** 199 * When set, this ViewGroup tries to always draw its children using their drawing cache. 200 */ 201 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 202 203 /** 204 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 205 * draw its children with their drawing cache. 206 */ 207 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 208 209 /** 210 * When set, this group will go through its list of children to notify them of 211 * any drawable state change. 212 */ 213 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 214 215 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 216 217 /** 218 * This view will get focus before any of its descendants. 219 */ 220 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 221 222 /** 223 * This view will get focus only if none of its descendants want it. 224 */ 225 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 226 227 /** 228 * This view will block any of its descendants from getting focus, even 229 * if they are focusable. 230 */ 231 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 232 233 /** 234 * Used to map between enum in attrubutes and flag values. 235 */ 236 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 237 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 238 FOCUS_BLOCK_DESCENDANTS}; 239 240 /** 241 * When set, this ViewGroup should not intercept touch events. 242 * {@hide} 243 */ 244 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 245 246 /** 247 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 248 */ 249 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x100000; 250 251 /** 252 * Indicates which types of drawing caches are to be kept in memory. 253 * This field should be made private, so it is hidden from the SDK. 254 * {@hide} 255 */ 256 protected int mPersistentDrawingCache; 257 258 /** 259 * Used to indicate that no drawing cache should be kept in memory. 260 */ 261 public static final int PERSISTENT_NO_CACHE = 0x0; 262 263 /** 264 * Used to indicate that the animation drawing cache should be kept in memory. 265 */ 266 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 267 268 /** 269 * Used to indicate that the scrolling drawing cache should be kept in memory. 270 */ 271 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 272 273 /** 274 * Used to indicate that all drawing caches should be kept in memory. 275 */ 276 public static final int PERSISTENT_ALL_CACHES = 0x3; 277 278 /** 279 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 280 * are set at the same time. 281 */ 282 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 283 284 // Index of the child's left position in the mLocation array 285 private static final int CHILD_LEFT_INDEX = 0; 286 // Index of the child's top position in the mLocation array 287 private static final int CHILD_TOP_INDEX = 1; 288 289 // Child views of this ViewGroup 290 private View[] mChildren; 291 // Number of valid children in the mChildren array, the rest should be null or not 292 // considered as children 293 private int mChildrenCount; 294 295 private static final int ARRAY_INITIAL_CAPACITY = 12; 296 private static final int ARRAY_CAPACITY_INCREMENT = 12; 297 298 // Used to draw cached views 299 private final Paint mCachePaint = new Paint(); 300 301 public ViewGroup(Context context) { 302 super(context); 303 initViewGroup(); 304 } 305 306 public ViewGroup(Context context, AttributeSet attrs) { 307 super(context, attrs); 308 initViewGroup(); 309 initFromAttributes(context, attrs); 310 } 311 312 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 313 super(context, attrs, defStyle); 314 initViewGroup(); 315 initFromAttributes(context, attrs); 316 } 317 318 private void initViewGroup() { 319 // ViewGroup doesn't draw by default 320 setFlags(WILL_NOT_DRAW, DRAW_MASK); 321 mGroupFlags |= FLAG_CLIP_CHILDREN; 322 mGroupFlags |= FLAG_CLIP_TO_PADDING; 323 mGroupFlags |= FLAG_ANIMATION_DONE; 324 mGroupFlags |= FLAG_ANIMATION_CACHE; 325 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 326 327 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 328 329 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 330 mChildrenCount = 0; 331 332 mCachePaint.setDither(false); 333 334 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 335 } 336 337 private void initFromAttributes(Context context, AttributeSet attrs) { 338 TypedArray a = context.obtainStyledAttributes(attrs, 339 R.styleable.ViewGroup); 340 341 final int N = a.getIndexCount(); 342 for (int i = 0; i < N; i++) { 343 int attr = a.getIndex(i); 344 switch (attr) { 345 case R.styleable.ViewGroup_clipChildren: 346 setClipChildren(a.getBoolean(attr, true)); 347 break; 348 case R.styleable.ViewGroup_clipToPadding: 349 setClipToPadding(a.getBoolean(attr, true)); 350 break; 351 case R.styleable.ViewGroup_animationCache: 352 setAnimationCacheEnabled(a.getBoolean(attr, true)); 353 break; 354 case R.styleable.ViewGroup_persistentDrawingCache: 355 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 356 break; 357 case R.styleable.ViewGroup_addStatesFromChildren: 358 setAddStatesFromChildren(a.getBoolean(attr, false)); 359 break; 360 case R.styleable.ViewGroup_alwaysDrawnWithCache: 361 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 362 break; 363 case R.styleable.ViewGroup_layoutAnimation: 364 int id = a.getResourceId(attr, -1); 365 if (id > 0) { 366 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 367 } 368 break; 369 case R.styleable.ViewGroup_descendantFocusability: 370 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 371 break; 372 case R.styleable.ViewGroup_splitMotionEvents: 373 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 374 break; 375 } 376 } 377 378 a.recycle(); 379 } 380 381 /** 382 * Gets the descendant focusability of this view group. The descendant 383 * focusability defines the relationship between this view group and its 384 * descendants when looking for a view to take focus in 385 * {@link #requestFocus(int, android.graphics.Rect)}. 386 * 387 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 388 * {@link #FOCUS_BLOCK_DESCENDANTS}. 389 */ 390 @ViewDebug.ExportedProperty(category = "focus", mapping = { 391 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 392 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 393 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 394 }) 395 public int getDescendantFocusability() { 396 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 397 } 398 399 /** 400 * Set the descendant focusability of this view group. This defines the relationship 401 * between this view group and its descendants when looking for a view to 402 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 403 * 404 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 405 * {@link #FOCUS_BLOCK_DESCENDANTS}. 406 */ 407 public void setDescendantFocusability(int focusability) { 408 switch (focusability) { 409 case FOCUS_BEFORE_DESCENDANTS: 410 case FOCUS_AFTER_DESCENDANTS: 411 case FOCUS_BLOCK_DESCENDANTS: 412 break; 413 default: 414 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 415 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 416 } 417 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 418 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 419 } 420 421 /** 422 * {@inheritDoc} 423 */ 424 @Override 425 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 426 if (mFocused != null) { 427 mFocused.unFocus(); 428 mFocused = null; 429 } 430 super.handleFocusGainInternal(direction, previouslyFocusedRect); 431 } 432 433 /** 434 * {@inheritDoc} 435 */ 436 public void requestChildFocus(View child, View focused) { 437 if (DBG) { 438 System.out.println(this + " requestChildFocus()"); 439 } 440 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 441 return; 442 } 443 444 // Unfocus us, if necessary 445 super.unFocus(); 446 447 // We had a previous notion of who had focus. Clear it. 448 if (mFocused != child) { 449 if (mFocused != null) { 450 mFocused.unFocus(); 451 } 452 453 mFocused = child; 454 } 455 if (mParent != null) { 456 mParent.requestChildFocus(this, focused); 457 } 458 } 459 460 /** 461 * {@inheritDoc} 462 */ 463 public void focusableViewAvailable(View v) { 464 if (mParent != null 465 // shortcut: don't report a new focusable view if we block our descendants from 466 // getting focus 467 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 468 // shortcut: don't report a new focusable view if we already are focused 469 // (and we don't prefer our descendants) 470 // 471 // note: knowing that mFocused is non-null is not a good enough reason 472 // to break the traversal since in that case we'd actually have to find 473 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 474 // an ancestor of v; this will get checked for at ViewRoot 475 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 476 mParent.focusableViewAvailable(v); 477 } 478 } 479 480 /** 481 * {@inheritDoc} 482 */ 483 public boolean showContextMenuForChild(View originalView) { 484 return mParent != null && mParent.showContextMenuForChild(originalView); 485 } 486 487 /** 488 * {@inheritDoc} 489 */ 490 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 491 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 492 } 493 494 /** 495 * Find the nearest view in the specified direction that wants to take 496 * focus. 497 * 498 * @param focused The view that currently has focus 499 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 500 * FOCUS_RIGHT, or 0 for not applicable. 501 */ 502 public View focusSearch(View focused, int direction) { 503 if (isRootNamespace()) { 504 // root namespace means we should consider ourselves the top of the 505 // tree for focus searching; otherwise we could be focus searching 506 // into other tabs. see LocalActivityManager and TabHost for more info 507 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 508 } else if (mParent != null) { 509 return mParent.focusSearch(focused, direction); 510 } 511 return null; 512 } 513 514 /** 515 * {@inheritDoc} 516 */ 517 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 518 return false; 519 } 520 521 /** 522 * {@inheritDoc} 523 */ 524 @Override 525 public boolean dispatchUnhandledMove(View focused, int direction) { 526 return mFocused != null && 527 mFocused.dispatchUnhandledMove(focused, direction); 528 } 529 530 /** 531 * {@inheritDoc} 532 */ 533 public void clearChildFocus(View child) { 534 if (DBG) { 535 System.out.println(this + " clearChildFocus()"); 536 } 537 538 mFocused = null; 539 if (mParent != null) { 540 mParent.clearChildFocus(this); 541 } 542 } 543 544 /** 545 * {@inheritDoc} 546 */ 547 @Override 548 public void clearFocus() { 549 super.clearFocus(); 550 551 // clear any child focus if it exists 552 if (mFocused != null) { 553 mFocused.clearFocus(); 554 } 555 } 556 557 /** 558 * {@inheritDoc} 559 */ 560 @Override 561 void unFocus() { 562 if (DBG) { 563 System.out.println(this + " unFocus()"); 564 } 565 566 super.unFocus(); 567 if (mFocused != null) { 568 mFocused.unFocus(); 569 } 570 mFocused = null; 571 } 572 573 /** 574 * Returns the focused child of this view, if any. The child may have focus 575 * or contain focus. 576 * 577 * @return the focused child or null. 578 */ 579 public View getFocusedChild() { 580 return mFocused; 581 } 582 583 /** 584 * Returns true if this view has or contains focus 585 * 586 * @return true if this view has or contains focus 587 */ 588 @Override 589 public boolean hasFocus() { 590 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 591 } 592 593 /* 594 * (non-Javadoc) 595 * 596 * @see android.view.View#findFocus() 597 */ 598 @Override 599 public View findFocus() { 600 if (DBG) { 601 System.out.println("Find focus in " + this + ": flags=" 602 + isFocused() + ", child=" + mFocused); 603 } 604 605 if (isFocused()) { 606 return this; 607 } 608 609 if (mFocused != null) { 610 return mFocused.findFocus(); 611 } 612 return null; 613 } 614 615 /** 616 * {@inheritDoc} 617 */ 618 @Override 619 public boolean hasFocusable() { 620 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 621 return false; 622 } 623 624 if (isFocusable()) { 625 return true; 626 } 627 628 final int descendantFocusability = getDescendantFocusability(); 629 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 630 final int count = mChildrenCount; 631 final View[] children = mChildren; 632 633 for (int i = 0; i < count; i++) { 634 final View child = children[i]; 635 if (child.hasFocusable()) { 636 return true; 637 } 638 } 639 } 640 641 return false; 642 } 643 644 /** 645 * {@inheritDoc} 646 */ 647 @Override 648 public void addFocusables(ArrayList<View> views, int direction) { 649 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 650 } 651 652 /** 653 * {@inheritDoc} 654 */ 655 @Override 656 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 657 final int focusableCount = views.size(); 658 659 final int descendantFocusability = getDescendantFocusability(); 660 661 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 662 final int count = mChildrenCount; 663 final View[] children = mChildren; 664 665 for (int i = 0; i < count; i++) { 666 final View child = children[i]; 667 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 668 child.addFocusables(views, direction, focusableMode); 669 } 670 } 671 } 672 673 // we add ourselves (if focusable) in all cases except for when we are 674 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 675 // to avoid the focus search finding layouts when a more precise search 676 // among the focusable children would be more interesting. 677 if ( 678 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 679 // No focusable descendants 680 (focusableCount == views.size())) { 681 super.addFocusables(views, direction, focusableMode); 682 } 683 } 684 685 /** 686 * {@inheritDoc} 687 */ 688 @Override 689 public void dispatchWindowFocusChanged(boolean hasFocus) { 690 super.dispatchWindowFocusChanged(hasFocus); 691 final int count = mChildrenCount; 692 final View[] children = mChildren; 693 for (int i = 0; i < count; i++) { 694 children[i].dispatchWindowFocusChanged(hasFocus); 695 } 696 } 697 698 /** 699 * {@inheritDoc} 700 */ 701 @Override 702 public void addTouchables(ArrayList<View> views) { 703 super.addTouchables(views); 704 705 final int count = mChildrenCount; 706 final View[] children = mChildren; 707 708 for (int i = 0; i < count; i++) { 709 final View child = children[i]; 710 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 711 child.addTouchables(views); 712 } 713 } 714 } 715 716 /** 717 * {@inheritDoc} 718 */ 719 @Override 720 public void dispatchDisplayHint(int hint) { 721 super.dispatchDisplayHint(hint); 722 final int count = mChildrenCount; 723 final View[] children = mChildren; 724 for (int i = 0; i < count; i++) { 725 children[i].dispatchDisplayHint(hint); 726 } 727 } 728 729 /** 730 * {@inheritDoc} 731 */ 732 @Override 733 protected void dispatchVisibilityChanged(View changedView, int visibility) { 734 super.dispatchVisibilityChanged(changedView, visibility); 735 final int count = mChildrenCount; 736 final View[] children = mChildren; 737 for (int i = 0; i < count; i++) { 738 children[i].dispatchVisibilityChanged(changedView, visibility); 739 } 740 } 741 742 /** 743 * {@inheritDoc} 744 */ 745 @Override 746 public void dispatchWindowVisibilityChanged(int visibility) { 747 super.dispatchWindowVisibilityChanged(visibility); 748 final int count = mChildrenCount; 749 final View[] children = mChildren; 750 for (int i = 0; i < count; i++) { 751 children[i].dispatchWindowVisibilityChanged(visibility); 752 } 753 } 754 755 /** 756 * {@inheritDoc} 757 */ 758 @Override 759 public void dispatchConfigurationChanged(Configuration newConfig) { 760 super.dispatchConfigurationChanged(newConfig); 761 final int count = mChildrenCount; 762 final View[] children = mChildren; 763 for (int i = 0; i < count; i++) { 764 children[i].dispatchConfigurationChanged(newConfig); 765 } 766 } 767 768 /** 769 * {@inheritDoc} 770 */ 771 public void recomputeViewAttributes(View child) { 772 ViewParent parent = mParent; 773 if (parent != null) parent.recomputeViewAttributes(this); 774 } 775 776 @Override 777 void dispatchCollectViewAttributes(int visibility) { 778 visibility |= mViewFlags&VISIBILITY_MASK; 779 super.dispatchCollectViewAttributes(visibility); 780 final int count = mChildrenCount; 781 final View[] children = mChildren; 782 for (int i = 0; i < count; i++) { 783 children[i].dispatchCollectViewAttributes(visibility); 784 } 785 } 786 787 /** 788 * {@inheritDoc} 789 */ 790 public void bringChildToFront(View child) { 791 int index = indexOfChild(child); 792 if (index >= 0) { 793 removeFromArray(index); 794 addInArray(child, mChildrenCount); 795 child.mParent = this; 796 } 797 } 798 799 /** 800 * {@inheritDoc} 801 */ 802 @Override 803 public boolean dispatchKeyEventPreIme(KeyEvent event) { 804 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 805 return super.dispatchKeyEventPreIme(event); 806 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 807 return mFocused.dispatchKeyEventPreIme(event); 808 } 809 return false; 810 } 811 812 /** 813 * {@inheritDoc} 814 */ 815 @Override 816 public boolean dispatchKeyEvent(KeyEvent event) { 817 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 818 return super.dispatchKeyEvent(event); 819 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 820 return mFocused.dispatchKeyEvent(event); 821 } 822 return false; 823 } 824 825 /** 826 * {@inheritDoc} 827 */ 828 @Override 829 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 830 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 831 return super.dispatchKeyShortcutEvent(event); 832 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 833 return mFocused.dispatchKeyShortcutEvent(event); 834 } 835 return false; 836 } 837 838 /** 839 * {@inheritDoc} 840 */ 841 @Override 842 public boolean dispatchTrackballEvent(MotionEvent event) { 843 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 844 return super.dispatchTrackballEvent(event); 845 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 846 return mFocused.dispatchTrackballEvent(event); 847 } 848 return false; 849 } 850 851 /** 852 * {@inheritDoc} 853 */ 854 @Override 855 public boolean dispatchTouchEvent(MotionEvent ev) { 856 if ((mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS) { 857 if (mSplitMotionTargets == null) { 858 mSplitMotionTargets = new SplitMotionTargets(); 859 } 860 return dispatchSplitTouchEvent(ev); 861 } 862 863 final int action = ev.getAction(); 864 final float xf = ev.getX(); 865 final float yf = ev.getY(); 866 final float scrolledXFloat = xf + mScrollX; 867 final float scrolledYFloat = yf + mScrollY; 868 869 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 870 871 if (action == MotionEvent.ACTION_DOWN) { 872 if (mMotionTarget != null) { 873 // this is weird, we got a pen down, but we thought it was 874 // already down! 875 // XXX: We should probably send an ACTION_UP to the current 876 // target. 877 mMotionTarget = null; 878 } 879 // If we're disallowing intercept or if we're allowing and we didn't 880 // intercept 881 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 882 // reset this event's action (just to protect ourselves) 883 ev.setAction(MotionEvent.ACTION_DOWN); 884 // We know we want to dispatch the event down, find a child 885 // who can handle it, start with the front-most child. 886 final View[] children = mChildren; 887 final int count = mChildrenCount; 888 for (int i = count - 1; i >= 0; i--) { 889 final View child = children[i]; 890 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 891 || child.getAnimation() != null) { 892 // Single dispatch always picks its target based on the initial down 893 // event's position - index 0 894 if (dispatchTouchEventIfInView(child, ev, 0)) { 895 mMotionTarget = child; 896 return true; 897 } 898 } 899 } 900 } 901 } 902 903 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 904 (action == MotionEvent.ACTION_CANCEL); 905 906 if (isUpOrCancel) { 907 // Note, we've already copied the previous state to our local 908 // variable, so this takes effect on the next event 909 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 910 } 911 912 // The event wasn't an ACTION_DOWN, dispatch it to our target if 913 // we have one. 914 final View target = mMotionTarget; 915 if (target == null) { 916 // We don't have a target, this means we're handling the 917 // event as a regular view. 918 ev.setLocation(xf, yf); 919 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 920 ev.setAction(MotionEvent.ACTION_CANCEL); 921 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 922 } 923 return super.dispatchTouchEvent(ev); 924 } 925 926 // Calculate the offset point into the target's local coordinates 927 float xc = scrolledXFloat - (float) target.mLeft; 928 float yc = scrolledYFloat - (float) target.mTop; 929 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 930 // non-identity matrix: transform the point into the view's coordinates 931 final float[] localXY = mAttachInfo.mTmpTransformLocation; 932 localXY[0] = xc; 933 localXY[1] = yc; 934 target.getInverseMatrix().mapPoints(localXY); 935 xc = localXY[0]; 936 yc = localXY[1]; 937 } 938 939 // if have a target, see if we're allowed to and want to intercept its 940 // events 941 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 942 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 943 ev.setAction(MotionEvent.ACTION_CANCEL); 944 ev.setLocation(xc, yc); 945 if (!target.dispatchTouchEvent(ev)) { 946 // target didn't handle ACTION_CANCEL. not much we can do 947 // but they should have. 948 } 949 // clear the target 950 mMotionTarget = null; 951 // Don't dispatch this event to our own view, because we already 952 // saw it when intercepting; we just want to give the following 953 // event to the normal onTouchEvent(). 954 return true; 955 } 956 957 if (isUpOrCancel) { 958 mMotionTarget = null; 959 } 960 961 // finally offset the event to the target's coordinate system and 962 // dispatch the event. 963 ev.setLocation(xc, yc); 964 965 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 966 ev.setAction(MotionEvent.ACTION_CANCEL); 967 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 968 mMotionTarget = null; 969 } 970 971 if (target.dispatchTouchEvent(ev)) { 972 return true; 973 } else { 974 ev.setLocation(xf, yf); 975 } 976 return false; 977 } 978 979 /** 980 * This method detects whether the pointer location at <code>pointerIndex</code> within 981 * <code>ev</code> is inside the specified view. If so, the transformed event is dispatched to 982 * <code>child</code>. 983 * 984 * @param child View to hit test against 985 * @param ev MotionEvent to test 986 * @param pointerIndex Index of the pointer within <code>ev</code> to test 987 * @return <code>false</code> if the hit test failed, or the result of 988 * <code>child.dispatchTouchEvent</code> 989 */ 990 private boolean dispatchTouchEventIfInView(View child, MotionEvent ev, int pointerIndex) { 991 final float x = ev.getX(pointerIndex); 992 final float y = ev.getY(pointerIndex); 993 final float scrolledX = x + mScrollX; 994 final float scrolledY = y + mScrollY; 995 float localX = scrolledX - child.mLeft; 996 float localY = scrolledY - child.mTop; 997 if (!child.hasIdentityMatrix() && mAttachInfo != null) { 998 // non-identity matrix: transform the point into the view's coordinates 999 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1000 localXY[0] = localX; 1001 localXY[1] = localY; 1002 child.getInverseMatrix().mapPoints(localXY); 1003 localX = localXY[0]; 1004 localY = localXY[1]; 1005 } 1006 if (localX >= 0 && localY >= 0 && localX < (child.mRight - child.mLeft) && 1007 localY < (child.mBottom - child.mTop)) { 1008 // It would be safer to clone the event here but we don't for performance. 1009 // There are many subtle interactions in touch event dispatch; change at your own risk. 1010 child.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1011 ev.offsetLocation(localX - x, localY - y); 1012 if (child.dispatchTouchEvent(ev)) { 1013 return true; 1014 } else { 1015 ev.offsetLocation(x - localX, y - localY); 1016 return false; 1017 } 1018 } 1019 return false; 1020 } 1021 1022 private boolean dispatchSplitTouchEvent(MotionEvent ev) { 1023 final SplitMotionTargets targets = mSplitMotionTargets; 1024 final int action = ev.getAction(); 1025 final int maskedAction = ev.getActionMasked(); 1026 float xf = ev.getX(); 1027 float yf = ev.getY(); 1028 float scrolledXFloat = xf + mScrollX; 1029 float scrolledYFloat = yf + mScrollY; 1030 1031 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1032 1033 if (maskedAction == MotionEvent.ACTION_DOWN || 1034 maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 1035 final int actionIndex = ev.getActionIndex(); 1036 final int actionId = ev.getPointerId(actionIndex); 1037 1038 // Clear out any current target for this ID. 1039 // XXX: We should probably send an ACTION_UP to the current 1040 // target if present. 1041 targets.removeById(actionId); 1042 1043 // If we're disallowing intercept or if we're allowing and we didn't 1044 // intercept 1045 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 1046 // reset this event's action (just to protect ourselves) 1047 ev.setAction(action); 1048 // We know we want to dispatch the event down, try to find a child 1049 // who can handle it, start with the front-most child. 1050 final long downTime = ev.getEventTime(); 1051 final View[] children = mChildren; 1052 final int count = mChildrenCount; 1053 for (int i = count - 1; i >= 0; i--) { 1054 final View child = children[i]; 1055 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1056 || child.getAnimation() != null) { 1057 final MotionEvent childEvent = 1058 targets.filterMotionEventForChild(ev, child, downTime); 1059 if (childEvent != null) { 1060 try { 1061 final int childActionIndex = childEvent.findPointerIndex(actionId); 1062 if (dispatchTouchEventIfInView(child, childEvent, 1063 childActionIndex)) { 1064 targets.add(actionId, child, downTime); 1065 1066 return true; 1067 } 1068 } finally { 1069 childEvent.recycle(); 1070 } 1071 } 1072 } 1073 } 1074 1075 // Didn't find a new target. Do we have a "primary" target to send to? 1076 final SplitMotionTargets.TargetInfo primaryTargetInfo = targets.getPrimaryTarget(); 1077 if (primaryTargetInfo != null) { 1078 final View primaryTarget = primaryTargetInfo.view; 1079 final MotionEvent childEvent = targets.filterMotionEventForChild(ev, 1080 primaryTarget, primaryTargetInfo.downTime); 1081 if (childEvent != null) { 1082 try { 1083 // Calculate the offset point into the target's local coordinates 1084 float xc = scrolledXFloat - (float) primaryTarget.mLeft; 1085 float yc = scrolledYFloat - (float) primaryTarget.mTop; 1086 if (!primaryTarget.hasIdentityMatrix() && mAttachInfo != null) { 1087 // non-identity matrix: transform the point into the view's 1088 // coordinates 1089 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1090 localXY[0] = xc; 1091 localXY[1] = yc; 1092 primaryTarget.getInverseMatrix().mapPoints(localXY); 1093 xc = localXY[0]; 1094 yc = localXY[1]; 1095 } 1096 childEvent.setLocation(xc, yc); 1097 if (primaryTarget.dispatchTouchEvent(childEvent)) { 1098 targets.add(actionId, primaryTarget, primaryTargetInfo.downTime); 1099 return true; 1100 } 1101 } finally { 1102 childEvent.recycle(); 1103 } 1104 } 1105 } 1106 } 1107 } 1108 1109 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 1110 (action == MotionEvent.ACTION_CANCEL); 1111 1112 if (isUpOrCancel) { 1113 // Note, we've already copied the previous state to our local 1114 // variable, so this takes effect on the next event 1115 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1116 } 1117 1118 if (targets.isEmpty()) { 1119 // We don't have any targets, this means we're handling the 1120 // event as a regular view. 1121 ev.setLocation(xf, yf); 1122 if ((mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1123 ev.setAction(MotionEvent.ACTION_CANCEL); 1124 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1125 } 1126 return super.dispatchTouchEvent(ev); 1127 } 1128 1129 // if we have targets, see if we're allowed to and want to intercept their 1130 // events 1131 int uniqueTargetCount = targets.getUniqueTargetCount(); 1132 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 1133 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1134 1135 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1136 final View target = targets.getUniqueTargetAt(uniqueIndex).view; 1137 1138 // Calculate the offset point into the target's local coordinates 1139 float xc = scrolledXFloat - (float) target.mLeft; 1140 float yc = scrolledYFloat - (float) target.mTop; 1141 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1142 // non-identity matrix: transform the point into the view's coordinates 1143 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1144 localXY[0] = xc; 1145 localXY[1] = yc; 1146 target.getInverseMatrix().mapPoints(localXY); 1147 xc = localXY[0]; 1148 yc = localXY[1]; 1149 } 1150 1151 ev.setAction(MotionEvent.ACTION_CANCEL); 1152 ev.setLocation(xc, yc); 1153 if (!target.dispatchTouchEvent(ev)) { 1154 // target didn't handle ACTION_CANCEL. not much we can do 1155 // but they should have. 1156 } 1157 } 1158 targets.clear(); 1159 // Don't dispatch this event to our own view, because we already 1160 // saw it when intercepting; we just want to give the following 1161 // event to the normal onTouchEvent(). 1162 return true; 1163 } 1164 1165 boolean handled = false; 1166 for (int uniqueIndex = 0; uniqueIndex < uniqueTargetCount; uniqueIndex++) { 1167 final SplitMotionTargets.TargetInfo targetInfo = targets.getUniqueTargetAt(uniqueIndex); 1168 final View target = targetInfo.view; 1169 1170 final MotionEvent targetEvent = 1171 targets.filterMotionEventForChild(ev, target, targetInfo.downTime); 1172 if (targetEvent == null) { 1173 continue; 1174 } 1175 1176 try { 1177 // Calculate the offset point into the target's local coordinates 1178 xf = targetEvent.getX(); 1179 yf = targetEvent.getY(); 1180 scrolledXFloat = xf + mScrollX; 1181 scrolledYFloat = yf + mScrollY; 1182 float xc = scrolledXFloat - (float) target.mLeft; 1183 float yc = scrolledYFloat - (float) target.mTop; 1184 if (!target.hasIdentityMatrix() && mAttachInfo != null) { 1185 // non-identity matrix: transform the point into the view's coordinates 1186 final float[] localXY = mAttachInfo.mTmpTransformLocation; 1187 localXY[0] = xc; 1188 localXY[1] = yc; 1189 target.getInverseMatrix().mapPoints(localXY); 1190 xc = localXY[0]; 1191 yc = localXY[1]; 1192 } 1193 1194 // finally offset the event to the target's coordinate system and 1195 // dispatch the event. 1196 targetEvent.setLocation(xc, yc); 1197 1198 if ((target.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { 1199 targetEvent.setAction(MotionEvent.ACTION_CANCEL); 1200 target.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 1201 targets.removeView(target); 1202 uniqueIndex--; 1203 uniqueTargetCount--; 1204 } 1205 1206 final boolean childHandled = target.dispatchTouchEvent(targetEvent); 1207 handled |= childHandled; 1208 if (!childHandled) { 1209 // Child doesn't want these events anymore, but we're still dispatching 1210 // other split events to children. 1211 targets.removeView(target); 1212 } 1213 } finally { 1214 targetEvent.recycle(); 1215 } 1216 } 1217 1218 if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 1219 final int removeId = ev.getPointerId(ev.getActionIndex()); 1220 targets.removeById(removeId); 1221 } 1222 1223 if (isUpOrCancel) { 1224 targets.clear(); 1225 } 1226 1227 return handled; 1228 } 1229 1230 /** 1231 * Enable or disable the splitting of MotionEvents to multiple children during touch event 1232 * dispatch. This behavior is disabled by default. 1233 * 1234 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 1235 * views depending on where each pointer initially went down. This allows for user interactions 1236 * such as scrolling two panes of content independently, chording of buttons, and performing 1237 * independent gestures on different pieces of content. 1238 * 1239 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 1240 * child views. <code>false</code> to only allow one child view to be the target of 1241 * any MotionEvent received by this ViewGroup. 1242 */ 1243 public void setMotionEventSplittingEnabled(boolean split) { 1244 // TODO Applications really shouldn't change this setting mid-touch event, 1245 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 1246 // with gestures in progress when this is changed. 1247 if (split) { 1248 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 1249 } else { 1250 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 1251 mSplitMotionTargets = null; 1252 } 1253 } 1254 1255 /** 1256 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 1257 */ 1258 public boolean isMotionEventSplittingEnabled() { 1259 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 1260 } 1261 1262 /** 1263 * {@inheritDoc} 1264 */ 1265 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 1266 1267 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 1268 // We're already in this state, assume our ancestors are too 1269 return; 1270 } 1271 1272 if (disallowIntercept) { 1273 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 1274 } else { 1275 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1276 } 1277 1278 // Pass it up to our parent 1279 if (mParent != null) { 1280 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 1281 } 1282 } 1283 1284 /** 1285 * Implement this method to intercept all touch screen motion events. This 1286 * allows you to watch events as they are dispatched to your children, and 1287 * take ownership of the current gesture at any point. 1288 * 1289 * <p>Using this function takes some care, as it has a fairly complicated 1290 * interaction with {@link View#onTouchEvent(MotionEvent) 1291 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 1292 * that method as well as this one in the correct way. Events will be 1293 * received in the following order: 1294 * 1295 * <ol> 1296 * <li> You will receive the down event here. 1297 * <li> The down event will be handled either by a child of this view 1298 * group, or given to your own onTouchEvent() method to handle; this means 1299 * you should implement onTouchEvent() to return true, so you will 1300 * continue to see the rest of the gesture (instead of looking for 1301 * a parent view to handle it). Also, by returning true from 1302 * onTouchEvent(), you will not receive any following 1303 * events in onInterceptTouchEvent() and all touch processing must 1304 * happen in onTouchEvent() like normal. 1305 * <li> For as long as you return false from this function, each following 1306 * event (up to and including the final up) will be delivered first here 1307 * and then to the target's onTouchEvent(). 1308 * <li> If you return true from here, you will not receive any 1309 * following events: the target view will receive the same event but 1310 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 1311 * events will be delivered to your onTouchEvent() method and no longer 1312 * appear here. 1313 * </ol> 1314 * 1315 * @param ev The motion event being dispatched down the hierarchy. 1316 * @return Return true to steal motion events from the children and have 1317 * them dispatched to this ViewGroup through onTouchEvent(). 1318 * The current target will receive an ACTION_CANCEL event, and no further 1319 * messages will be delivered here. 1320 */ 1321 public boolean onInterceptTouchEvent(MotionEvent ev) { 1322 return false; 1323 } 1324 1325 /** 1326 * {@inheritDoc} 1327 * 1328 * Looks for a view to give focus to respecting the setting specified by 1329 * {@link #getDescendantFocusability()}. 1330 * 1331 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 1332 * find focus within the children of this group when appropriate. 1333 * 1334 * @see #FOCUS_BEFORE_DESCENDANTS 1335 * @see #FOCUS_AFTER_DESCENDANTS 1336 * @see #FOCUS_BLOCK_DESCENDANTS 1337 * @see #onRequestFocusInDescendants 1338 */ 1339 @Override 1340 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 1341 if (DBG) { 1342 System.out.println(this + " ViewGroup.requestFocus direction=" 1343 + direction); 1344 } 1345 int descendantFocusability = getDescendantFocusability(); 1346 1347 switch (descendantFocusability) { 1348 case FOCUS_BLOCK_DESCENDANTS: 1349 return super.requestFocus(direction, previouslyFocusedRect); 1350 case FOCUS_BEFORE_DESCENDANTS: { 1351 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 1352 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 1353 } 1354 case FOCUS_AFTER_DESCENDANTS: { 1355 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 1356 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 1357 } 1358 default: 1359 throw new IllegalStateException("descendant focusability must be " 1360 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 1361 + "but is " + descendantFocusability); 1362 } 1363 } 1364 1365 /** 1366 * Look for a descendant to call {@link View#requestFocus} on. 1367 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 1368 * when it wants to request focus within its children. Override this to 1369 * customize how your {@link ViewGroup} requests focus within its children. 1370 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1371 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 1372 * to give a finer grained hint about where focus is coming from. May be null 1373 * if there is no hint. 1374 * @return Whether focus was taken. 1375 */ 1376 @SuppressWarnings({"ConstantConditions"}) 1377 protected boolean onRequestFocusInDescendants(int direction, 1378 Rect previouslyFocusedRect) { 1379 int index; 1380 int increment; 1381 int end; 1382 int count = mChildrenCount; 1383 if ((direction & FOCUS_FORWARD) != 0) { 1384 index = 0; 1385 increment = 1; 1386 end = count; 1387 } else { 1388 index = count - 1; 1389 increment = -1; 1390 end = -1; 1391 } 1392 final View[] children = mChildren; 1393 for (int i = index; i != end; i += increment) { 1394 View child = children[i]; 1395 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1396 if (child.requestFocus(direction, previouslyFocusedRect)) { 1397 return true; 1398 } 1399 } 1400 } 1401 return false; 1402 } 1403 1404 /** 1405 * {@inheritDoc} 1406 * 1407 * @hide 1408 */ 1409 @Override 1410 public void dispatchStartTemporaryDetach() { 1411 super.dispatchStartTemporaryDetach(); 1412 final int count = mChildrenCount; 1413 final View[] children = mChildren; 1414 for (int i = 0; i < count; i++) { 1415 children[i].dispatchStartTemporaryDetach(); 1416 } 1417 } 1418 1419 /** 1420 * {@inheritDoc} 1421 * 1422 * @hide 1423 */ 1424 @Override 1425 public void dispatchFinishTemporaryDetach() { 1426 super.dispatchFinishTemporaryDetach(); 1427 final int count = mChildrenCount; 1428 final View[] children = mChildren; 1429 for (int i = 0; i < count; i++) { 1430 children[i].dispatchFinishTemporaryDetach(); 1431 } 1432 } 1433 1434 /** 1435 * {@inheritDoc} 1436 */ 1437 @Override 1438 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1439 super.dispatchAttachedToWindow(info, visibility); 1440 visibility |= mViewFlags & VISIBILITY_MASK; 1441 final int count = mChildrenCount; 1442 final View[] children = mChildren; 1443 for (int i = 0; i < count; i++) { 1444 children[i].dispatchAttachedToWindow(info, visibility); 1445 } 1446 } 1447 1448 @Override 1449 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1450 boolean populated = false; 1451 for (int i = 0, count = getChildCount(); i < count; i++) { 1452 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1453 } 1454 return populated; 1455 } 1456 1457 /** 1458 * {@inheritDoc} 1459 */ 1460 @Override 1461 void dispatchDetachedFromWindow() { 1462 // If we still have a motion target, we are still in the process of 1463 // dispatching motion events to a child; we need to get rid of that 1464 // child to avoid dispatching events to it after the window is torn 1465 // down. To make sure we keep the child in a consistent state, we 1466 // first send it an ACTION_CANCEL motion event. 1467 if (mMotionTarget != null) { 1468 final long now = SystemClock.uptimeMillis(); 1469 final MotionEvent event = MotionEvent.obtain(now, now, 1470 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1471 mMotionTarget.dispatchTouchEvent(event); 1472 event.recycle(); 1473 mMotionTarget = null; 1474 } 1475 1476 final int count = mChildrenCount; 1477 final View[] children = mChildren; 1478 for (int i = 0; i < count; i++) { 1479 children[i].dispatchDetachedFromWindow(); 1480 } 1481 super.dispatchDetachedFromWindow(); 1482 } 1483 1484 /** 1485 * {@inheritDoc} 1486 */ 1487 @Override 1488 public void setPadding(int left, int top, int right, int bottom) { 1489 super.setPadding(left, top, right, bottom); 1490 1491 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1492 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1493 } else { 1494 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1495 } 1496 } 1497 1498 /** 1499 * {@inheritDoc} 1500 */ 1501 @Override 1502 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1503 super.dispatchSaveInstanceState(container); 1504 final int count = mChildrenCount; 1505 final View[] children = mChildren; 1506 for (int i = 0; i < count; i++) { 1507 View c = children[i]; 1508 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1509 c.dispatchSaveInstanceState(container); 1510 } 1511 } 1512 } 1513 1514 /** 1515 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1516 * not to its children. For use when overriding 1517 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1518 * their own state but not the state of their children. 1519 * 1520 * @param container the container 1521 */ 1522 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1523 super.dispatchSaveInstanceState(container); 1524 } 1525 1526 /** 1527 * {@inheritDoc} 1528 */ 1529 @Override 1530 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1531 super.dispatchRestoreInstanceState(container); 1532 final int count = mChildrenCount; 1533 final View[] children = mChildren; 1534 for (int i = 0; i < count; i++) { 1535 View c = children[i]; 1536 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 1537 c.dispatchRestoreInstanceState(container); 1538 } 1539 } 1540 } 1541 1542 /** 1543 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1544 * not to its children. For use when overriding 1545 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1546 * their own state but not the state of their children. 1547 * 1548 * @param container the container 1549 */ 1550 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1551 super.dispatchRestoreInstanceState(container); 1552 } 1553 1554 /** 1555 * Enables or disables the drawing cache for each child of this view group. 1556 * 1557 * @param enabled true to enable the cache, false to dispose of it 1558 */ 1559 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1560 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1561 final View[] children = mChildren; 1562 final int count = mChildrenCount; 1563 for (int i = 0; i < count; i++) { 1564 children[i].setDrawingCacheEnabled(enabled); 1565 } 1566 } 1567 } 1568 1569 @Override 1570 protected void onAnimationStart() { 1571 super.onAnimationStart(); 1572 1573 // When this ViewGroup's animation starts, build the cache for the children 1574 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1575 final int count = mChildrenCount; 1576 final View[] children = mChildren; 1577 1578 for (int i = 0; i < count; i++) { 1579 final View child = children[i]; 1580 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1581 child.setDrawingCacheEnabled(true); 1582 child.buildDrawingCache(true); 1583 } 1584 } 1585 1586 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1587 } 1588 } 1589 1590 @Override 1591 protected void onAnimationEnd() { 1592 super.onAnimationEnd(); 1593 1594 // When this ViewGroup's animation ends, destroy the cache of the children 1595 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1596 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1597 1598 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1599 setChildrenDrawingCacheEnabled(false); 1600 } 1601 } 1602 } 1603 1604 @Override 1605 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 1606 int count = mChildrenCount; 1607 int[] visibilities = null; 1608 1609 if (skipChildren) { 1610 visibilities = new int[count]; 1611 for (int i = 0; i < count; i++) { 1612 View child = getChildAt(i); 1613 visibilities[i] = child.getVisibility(); 1614 if (visibilities[i] == View.VISIBLE) { 1615 child.setVisibility(INVISIBLE); 1616 } 1617 } 1618 } 1619 1620 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 1621 1622 if (skipChildren) { 1623 for (int i = 0; i < count; i++) { 1624 getChildAt(i).setVisibility(visibilities[i]); 1625 } 1626 } 1627 1628 return b; 1629 } 1630 1631 /** 1632 * {@inheritDoc} 1633 */ 1634 @Override 1635 protected void dispatchDraw(Canvas canvas) { 1636 final int count = mChildrenCount; 1637 final View[] children = mChildren; 1638 int flags = mGroupFlags; 1639 1640 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1641 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1642 1643 for (int i = 0; i < count; i++) { 1644 final View child = children[i]; 1645 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1646 final LayoutParams params = child.getLayoutParams(); 1647 attachLayoutAnimationParameters(child, params, i, count); 1648 bindLayoutAnimation(child); 1649 if (cache) { 1650 child.setDrawingCacheEnabled(true); 1651 child.buildDrawingCache(true); 1652 } 1653 } 1654 } 1655 1656 final LayoutAnimationController controller = mLayoutAnimationController; 1657 if (controller.willOverlap()) { 1658 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1659 } 1660 1661 controller.start(); 1662 1663 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1664 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1665 1666 if (cache) { 1667 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1668 } 1669 1670 if (mAnimationListener != null) { 1671 mAnimationListener.onAnimationStart(controller.getAnimation()); 1672 } 1673 } 1674 1675 int saveCount = 0; 1676 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1677 if (clipToPadding) { 1678 saveCount = canvas.save(); 1679 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1680 mScrollX + mRight - mLeft - mPaddingRight, 1681 mScrollY + mBottom - mTop - mPaddingBottom); 1682 1683 } 1684 1685 // We will draw our child's animation, let's reset the flag 1686 mPrivateFlags &= ~DRAW_ANIMATION; 1687 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1688 1689 boolean more = false; 1690 final long drawingTime = getDrawingTime(); 1691 1692 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1693 for (int i = 0; i < count; i++) { 1694 final View child = children[i]; 1695 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1696 more |= drawChild(canvas, child, drawingTime); 1697 } 1698 } 1699 } else { 1700 for (int i = 0; i < count; i++) { 1701 final View child = children[getChildDrawingOrder(count, i)]; 1702 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1703 more |= drawChild(canvas, child, drawingTime); 1704 } 1705 } 1706 } 1707 1708 // Draw any disappearing views that have animations 1709 if (mDisappearingChildren != null) { 1710 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1711 final int disappearingCount = disappearingChildren.size() - 1; 1712 // Go backwards -- we may delete as animations finish 1713 for (int i = disappearingCount; i >= 0; i--) { 1714 final View child = disappearingChildren.get(i); 1715 more |= drawChild(canvas, child, drawingTime); 1716 } 1717 } 1718 1719 if (clipToPadding) { 1720 canvas.restoreToCount(saveCount); 1721 } 1722 1723 // mGroupFlags might have been updated by drawChild() 1724 flags = mGroupFlags; 1725 1726 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1727 invalidate(); 1728 } 1729 1730 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1731 mLayoutAnimationController.isDone() && !more) { 1732 // We want to erase the drawing cache and notify the listener after the 1733 // next frame is drawn because one extra invalidate() is caused by 1734 // drawChild() after the animation is over 1735 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1736 final Runnable end = new Runnable() { 1737 public void run() { 1738 notifyAnimationListener(); 1739 } 1740 }; 1741 post(end); 1742 } 1743 } 1744 1745 /** 1746 * Returns the index of the child to draw for this iteration. Override this 1747 * if you want to change the drawing order of children. By default, it 1748 * returns i. 1749 * <p> 1750 * NOTE: In order for this method to be called, you must enable child ordering 1751 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 1752 * 1753 * @param i The current iteration. 1754 * @return The index of the child to draw this iteration. 1755 * 1756 * @see #setChildrenDrawingOrderEnabled(boolean) 1757 * @see #isChildrenDrawingOrderEnabled() 1758 */ 1759 protected int getChildDrawingOrder(int childCount, int i) { 1760 return i; 1761 } 1762 1763 private void notifyAnimationListener() { 1764 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1765 mGroupFlags |= FLAG_ANIMATION_DONE; 1766 1767 if (mAnimationListener != null) { 1768 final Runnable end = new Runnable() { 1769 public void run() { 1770 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1771 } 1772 }; 1773 post(end); 1774 } 1775 1776 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1777 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1778 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1779 setChildrenDrawingCacheEnabled(false); 1780 } 1781 } 1782 1783 invalidate(); 1784 } 1785 1786 /** 1787 * Draw one child of this View Group. This method is responsible for getting 1788 * the canvas in the right state. This includes clipping, translating so 1789 * that the child's scrolled origin is at 0, 0, and applying any animation 1790 * transformations. 1791 * 1792 * @param canvas The canvas on which to draw the child 1793 * @param child Who to draw 1794 * @param drawingTime The time at which draw is occuring 1795 * @return True if an invalidate() was issued 1796 */ 1797 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1798 boolean more = false; 1799 1800 final int cl = child.mLeft; 1801 final int ct = child.mTop; 1802 final int cr = child.mRight; 1803 final int cb = child.mBottom; 1804 1805 final int flags = mGroupFlags; 1806 1807 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1808 mChildTransformation.clear(); 1809 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1810 } 1811 1812 Transformation transformToApply = null; 1813 Transformation invalidationTransform; 1814 final Animation a = child.getAnimation(); 1815 boolean concatMatrix = false; 1816 1817 boolean scalingRequired = false; 1818 boolean caching = false; 1819 if (!canvas.isHardwareAccelerated() && 1820 (flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1821 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1822 caching = true; 1823 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 1824 } 1825 1826 if (a != null) { 1827 final boolean initialized = a.isInitialized(); 1828 if (!initialized) { 1829 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1830 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1831 child.onAnimationStart(); 1832 } 1833 1834 more = a.getTransformation(drawingTime, mChildTransformation, 1835 scalingRequired ? mAttachInfo.mApplicationScale : 1f); 1836 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 1837 if (mInvalidationTransformation == null) { 1838 mInvalidationTransformation = new Transformation(); 1839 } 1840 invalidationTransform = mInvalidationTransformation; 1841 a.getTransformation(drawingTime, invalidationTransform, 1f); 1842 } else { 1843 invalidationTransform = mChildTransformation; 1844 } 1845 transformToApply = mChildTransformation; 1846 1847 concatMatrix = a.willChangeTransformationMatrix(); 1848 1849 if (more) { 1850 if (!a.willChangeBounds()) { 1851 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1852 FLAG_OPTIMIZE_INVALIDATE) { 1853 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1854 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1855 // The child need to draw an animation, potentially offscreen, so 1856 // make sure we do not cancel invalidate requests 1857 mPrivateFlags |= DRAW_ANIMATION; 1858 invalidate(cl, ct, cr, cb); 1859 } 1860 } else { 1861 if (mInvalidateRegion == null) { 1862 mInvalidateRegion = new RectF(); 1863 } 1864 final RectF region = mInvalidateRegion; 1865 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, invalidationTransform); 1866 1867 // The child need to draw an animation, potentially offscreen, so 1868 // make sure we do not cancel invalidate requests 1869 mPrivateFlags |= DRAW_ANIMATION; 1870 1871 final int left = cl + (int) region.left; 1872 final int top = ct + (int) region.top; 1873 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1874 } 1875 } 1876 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1877 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1878 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1879 if (hasTransform) { 1880 final int transformType = mChildTransformation.getTransformationType(); 1881 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1882 mChildTransformation : null; 1883 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1884 } 1885 } 1886 1887 concatMatrix |= !child.hasIdentityMatrix(); 1888 1889 // Sets the flag as early as possible to allow draw() implementations 1890 // to call invalidate() successfully when doing animations 1891 child.mPrivateFlags |= DRAWN; 1892 1893 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1894 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1895 return more; 1896 } 1897 1898 child.computeScroll(); 1899 1900 final int sx = child.mScrollX; 1901 final int sy = child.mScrollY; 1902 1903 Bitmap cache = null; 1904 if (caching) { 1905 cache = child.getDrawingCache(true); 1906 } 1907 1908 final boolean hasNoCache = cache == null; 1909 1910 final int restoreTo = canvas.save(); 1911 if (hasNoCache) { 1912 canvas.translate(cl - sx, ct - sy); 1913 } else { 1914 canvas.translate(cl, ct); 1915 if (scalingRequired) { 1916 // mAttachInfo cannot be null, otherwise scalingRequired == false 1917 final float scale = 1.0f / mAttachInfo.mApplicationScale; 1918 canvas.scale(scale, scale); 1919 } 1920 } 1921 1922 float alpha = child.getAlpha(); 1923 1924 if (transformToApply != null || alpha < 1.0f || !child.hasIdentityMatrix()) { 1925 int transX = 0; 1926 int transY = 0; 1927 1928 if (hasNoCache) { 1929 transX = -sx; 1930 transY = -sy; 1931 } 1932 1933 if (transformToApply != null) { 1934 if (concatMatrix) { 1935 // Undo the scroll translation, apply the transformation matrix, 1936 // then redo the scroll translate to get the correct result. 1937 canvas.translate(-transX, -transY); 1938 canvas.concat(transformToApply.getMatrix()); 1939 canvas.translate(transX, transY); 1940 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1941 } 1942 1943 float transformAlpha = transformToApply.getAlpha(); 1944 if (transformAlpha < 1.0f) { 1945 alpha *= transformToApply.getAlpha(); 1946 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1947 } 1948 } 1949 1950 if (!child.hasIdentityMatrix()) { 1951 canvas.translate(-transX, -transY); 1952 canvas.concat(child.getMatrix()); 1953 canvas.translate(transX, transY); 1954 } 1955 1956 if (alpha < 1.0f) { 1957 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1958 1959 if (hasNoCache) { 1960 final int multipliedAlpha = (int) (255 * alpha); 1961 if (!child.onSetAlpha(multipliedAlpha)) { 1962 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1963 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1964 } else { 1965 child.mPrivateFlags |= ALPHA_SET; 1966 } 1967 } 1968 } 1969 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1970 child.onSetAlpha(255); 1971 child.mPrivateFlags &= ~ALPHA_SET; 1972 } 1973 1974 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1975 if (hasNoCache) { 1976 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1977 } else { 1978 if (!scalingRequired) { 1979 canvas.clipRect(0, 0, cr - cl, cb - ct); 1980 } else { 1981 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 1982 } 1983 } 1984 } 1985 1986 if (hasNoCache) { 1987 // Fast path for layouts with no backgrounds 1988 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 1989 if (ViewDebug.TRACE_HIERARCHY) { 1990 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 1991 } 1992 child.mPrivateFlags &= ~DIRTY_MASK; 1993 child.dispatchDraw(canvas); 1994 } else { 1995 child.draw(canvas); 1996 } 1997 } else { 1998 final Paint cachePaint = mCachePaint; 1999 if (alpha < 1.0f) { 2000 cachePaint.setAlpha((int) (alpha * 255)); 2001 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 2002 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 2003 cachePaint.setAlpha(255); 2004 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 2005 } 2006 if (Config.DEBUG && ViewDebug.profileDrawing) { 2007 EventLog.writeEvent(60003, hashCode()); 2008 } 2009 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 2010 } 2011 2012 canvas.restoreToCount(restoreTo); 2013 2014 if (a != null && !more) { 2015 child.onSetAlpha(255); 2016 finishAnimatingView(child, a); 2017 } 2018 2019 return more; 2020 } 2021 2022 /** 2023 * By default, children are clipped to their bounds before drawing. This 2024 * allows view groups to override this behavior for animations, etc. 2025 * 2026 * @param clipChildren true to clip children to their bounds, 2027 * false otherwise 2028 * @attr ref android.R.styleable#ViewGroup_clipChildren 2029 */ 2030 public void setClipChildren(boolean clipChildren) { 2031 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 2032 } 2033 2034 /** 2035 * By default, children are clipped to the padding of the ViewGroup. This 2036 * allows view groups to override this behavior 2037 * 2038 * @param clipToPadding true to clip children to the padding of the 2039 * group, false otherwise 2040 * @attr ref android.R.styleable#ViewGroup_clipToPadding 2041 */ 2042 public void setClipToPadding(boolean clipToPadding) { 2043 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 2044 } 2045 2046 /** 2047 * {@inheritDoc} 2048 */ 2049 @Override 2050 public void dispatchSetSelected(boolean selected) { 2051 final View[] children = mChildren; 2052 final int count = mChildrenCount; 2053 for (int i = 0; i < count; i++) { 2054 2055 children[i].setSelected(selected); 2056 } 2057 } 2058 2059 @Override 2060 protected void dispatchSetPressed(boolean pressed) { 2061 final View[] children = mChildren; 2062 final int count = mChildrenCount; 2063 for (int i = 0; i < count; i++) { 2064 children[i].setPressed(pressed); 2065 } 2066 } 2067 2068 /** 2069 * When this property is set to true, this ViewGroup supports static transformations on 2070 * children; this causes 2071 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 2072 * invoked when a child is drawn. 2073 * 2074 * Any subclass overriding 2075 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 2076 * set this property to true. 2077 * 2078 * @param enabled True to enable static transformations on children, false otherwise. 2079 * 2080 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 2081 */ 2082 protected void setStaticTransformationsEnabled(boolean enabled) { 2083 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 2084 } 2085 2086 /** 2087 * {@inheritDoc} 2088 * 2089 * @see #setStaticTransformationsEnabled(boolean) 2090 */ 2091 protected boolean getChildStaticTransformation(View child, Transformation t) { 2092 return false; 2093 } 2094 2095 /** 2096 * {@hide} 2097 */ 2098 @Override 2099 protected View findViewTraversal(int id) { 2100 if (id == mID) { 2101 return this; 2102 } 2103 2104 final View[] where = mChildren; 2105 final int len = mChildrenCount; 2106 2107 for (int i = 0; i < len; i++) { 2108 View v = where[i]; 2109 2110 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2111 v = v.findViewById(id); 2112 2113 if (v != null) { 2114 return v; 2115 } 2116 } 2117 } 2118 2119 return null; 2120 } 2121 2122 /** 2123 * {@hide} 2124 */ 2125 @Override 2126 protected View findViewWithTagTraversal(Object tag) { 2127 if (tag != null && tag.equals(mTag)) { 2128 return this; 2129 } 2130 2131 final View[] where = mChildren; 2132 final int len = mChildrenCount; 2133 2134 for (int i = 0; i < len; i++) { 2135 View v = where[i]; 2136 2137 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 2138 v = v.findViewWithTag(tag); 2139 2140 if (v != null) { 2141 return v; 2142 } 2143 } 2144 } 2145 2146 return null; 2147 } 2148 2149 /** 2150 * Adds a child view. If no layout parameters are already set on the child, the 2151 * default parameters for this ViewGroup are set on the child. 2152 * 2153 * @param child the child view to add 2154 * 2155 * @see #generateDefaultLayoutParams() 2156 */ 2157 public void addView(View child) { 2158 addView(child, -1); 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 * @param index the position at which to add the child 2167 * 2168 * @see #generateDefaultLayoutParams() 2169 */ 2170 public void addView(View child, int index) { 2171 LayoutParams params = child.getLayoutParams(); 2172 if (params == null) { 2173 params = generateDefaultLayoutParams(); 2174 if (params == null) { 2175 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 2176 } 2177 } 2178 addView(child, index, params); 2179 } 2180 2181 /** 2182 * Adds a child view with this ViewGroup's default layout parameters and the 2183 * specified width and height. 2184 * 2185 * @param child the child view to add 2186 */ 2187 public void addView(View child, int width, int height) { 2188 final LayoutParams params = generateDefaultLayoutParams(); 2189 params.width = width; 2190 params.height = height; 2191 addView(child, -1, params); 2192 } 2193 2194 /** 2195 * Adds a child view with the specified layout parameters. 2196 * 2197 * @param child the child view to add 2198 * @param params the layout parameters to set on the child 2199 */ 2200 public void addView(View child, LayoutParams params) { 2201 addView(child, -1, params); 2202 } 2203 2204 /** 2205 * Adds a child view with the specified layout parameters. 2206 * 2207 * @param child the child view to add 2208 * @param index the position at which to add the child 2209 * @param params the layout parameters to set on the child 2210 */ 2211 public void addView(View child, int index, LayoutParams params) { 2212 if (DBG) { 2213 System.out.println(this + " addView"); 2214 } 2215 2216 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 2217 // therefore, we call requestLayout() on ourselves before, so that the child's request 2218 // will be blocked at our level 2219 requestLayout(); 2220 invalidate(); 2221 addViewInner(child, index, params, false); 2222 } 2223 2224 /** 2225 * {@inheritDoc} 2226 */ 2227 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 2228 if (!checkLayoutParams(params)) { 2229 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 2230 } 2231 if (view.mParent != this) { 2232 throw new IllegalArgumentException("Given view not a child of " + this); 2233 } 2234 view.setLayoutParams(params); 2235 } 2236 2237 /** 2238 * {@inheritDoc} 2239 */ 2240 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 2241 return p != null; 2242 } 2243 2244 /** 2245 * Interface definition for a callback to be invoked when the hierarchy 2246 * within this view changed. The hierarchy changes whenever a child is added 2247 * to or removed from this view. 2248 */ 2249 public interface OnHierarchyChangeListener { 2250 /** 2251 * Called when a new child is added to a parent view. 2252 * 2253 * @param parent the view in which a child was added 2254 * @param child the new child view added in the hierarchy 2255 */ 2256 void onChildViewAdded(View parent, View child); 2257 2258 /** 2259 * Called when a child is removed from a parent view. 2260 * 2261 * @param parent the view from which the child was removed 2262 * @param child the child removed from the hierarchy 2263 */ 2264 void onChildViewRemoved(View parent, View child); 2265 } 2266 2267 /** 2268 * Register a callback to be invoked when a child is added to or removed 2269 * from this view. 2270 * 2271 * @param listener the callback to invoke on hierarchy change 2272 */ 2273 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 2274 mOnHierarchyChangeListener = listener; 2275 } 2276 2277 /** 2278 * Adds a view during layout. This is useful if in your onLayout() method, 2279 * you need to add more views (as does the list view for example). 2280 * 2281 * If index is negative, it means put it at the end of the list. 2282 * 2283 * @param child the view to add to the group 2284 * @param index the index at which the child must be added 2285 * @param params the layout parameters to associate with the child 2286 * @return true if the child was added, false otherwise 2287 */ 2288 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 2289 return addViewInLayout(child, index, params, false); 2290 } 2291 2292 /** 2293 * Adds a view during layout. This is useful if in your onLayout() method, 2294 * you need to add more views (as does the list view for example). 2295 * 2296 * If index is negative, it means put it at the end of the list. 2297 * 2298 * @param child the view to add to the group 2299 * @param index the index at which the child must be added 2300 * @param params the layout parameters to associate with the child 2301 * @param preventRequestLayout if true, calling this method will not trigger a 2302 * layout request on child 2303 * @return true if the child was added, false otherwise 2304 */ 2305 protected boolean addViewInLayout(View child, int index, LayoutParams params, 2306 boolean preventRequestLayout) { 2307 child.mParent = null; 2308 addViewInner(child, index, params, preventRequestLayout); 2309 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2310 return true; 2311 } 2312 2313 /** 2314 * Prevents the specified child to be laid out during the next layout pass. 2315 * 2316 * @param child the child on which to perform the cleanup 2317 */ 2318 protected void cleanupLayoutState(View child) { 2319 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 2320 } 2321 2322 private void addViewInner(View child, int index, LayoutParams params, 2323 boolean preventRequestLayout) { 2324 2325 if (child.getParent() != null) { 2326 throw new IllegalStateException("The specified child already has a parent. " + 2327 "You must call removeView() on the child's parent first."); 2328 } 2329 2330 if (!checkLayoutParams(params)) { 2331 params = generateLayoutParams(params); 2332 } 2333 2334 if (preventRequestLayout) { 2335 child.mLayoutParams = params; 2336 } else { 2337 child.setLayoutParams(params); 2338 } 2339 2340 if (index < 0) { 2341 index = mChildrenCount; 2342 } 2343 2344 addInArray(child, index); 2345 2346 // tell our children 2347 if (preventRequestLayout) { 2348 child.assignParent(this); 2349 } else { 2350 child.mParent = this; 2351 } 2352 2353 if (child.hasFocus()) { 2354 requestChildFocus(child, child.findFocus()); 2355 } 2356 2357 AttachInfo ai = mAttachInfo; 2358 if (ai != null) { 2359 boolean lastKeepOn = ai.mKeepScreenOn; 2360 ai.mKeepScreenOn = false; 2361 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 2362 if (ai.mKeepScreenOn) { 2363 needGlobalAttributesUpdate(true); 2364 } 2365 ai.mKeepScreenOn = lastKeepOn; 2366 } 2367 2368 if (mOnHierarchyChangeListener != null) { 2369 mOnHierarchyChangeListener.onChildViewAdded(this, child); 2370 } 2371 2372 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 2373 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 2374 } 2375 } 2376 2377 private void addInArray(View child, int index) { 2378 View[] children = mChildren; 2379 final int count = mChildrenCount; 2380 final int size = children.length; 2381 if (index == count) { 2382 if (size == count) { 2383 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2384 System.arraycopy(children, 0, mChildren, 0, size); 2385 children = mChildren; 2386 } 2387 children[mChildrenCount++] = child; 2388 } else if (index < count) { 2389 if (size == count) { 2390 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 2391 System.arraycopy(children, 0, mChildren, 0, index); 2392 System.arraycopy(children, index, mChildren, index + 1, count - index); 2393 children = mChildren; 2394 } else { 2395 System.arraycopy(children, index, children, index + 1, count - index); 2396 } 2397 children[index] = child; 2398 mChildrenCount++; 2399 } else { 2400 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 2401 } 2402 } 2403 2404 // This method also sets the child's mParent to null 2405 private void removeFromArray(int index) { 2406 final View[] children = mChildren; 2407 children[index].mParent = null; 2408 final int count = mChildrenCount; 2409 if (index == count - 1) { 2410 children[--mChildrenCount] = null; 2411 } else if (index >= 0 && index < count) { 2412 System.arraycopy(children, index + 1, children, index, count - index - 1); 2413 children[--mChildrenCount] = null; 2414 } else { 2415 throw new IndexOutOfBoundsException(); 2416 } 2417 } 2418 2419 // This method also sets the children's mParent to null 2420 private void removeFromArray(int start, int count) { 2421 final View[] children = mChildren; 2422 final int childrenCount = mChildrenCount; 2423 2424 start = Math.max(0, start); 2425 final int end = Math.min(childrenCount, start + count); 2426 2427 if (start == end) { 2428 return; 2429 } 2430 2431 if (end == childrenCount) { 2432 for (int i = start; i < end; i++) { 2433 children[i].mParent = null; 2434 children[i] = null; 2435 } 2436 } else { 2437 for (int i = start; i < end; i++) { 2438 children[i].mParent = null; 2439 } 2440 2441 // Since we're looping above, we might as well do the copy, but is arraycopy() 2442 // faster than the extra 2 bounds checks we would do in the loop? 2443 System.arraycopy(children, end, children, start, childrenCount - end); 2444 2445 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 2446 children[i] = null; 2447 } 2448 } 2449 2450 mChildrenCount -= (end - start); 2451 } 2452 2453 private void bindLayoutAnimation(View child) { 2454 Animation a = mLayoutAnimationController.getAnimationForView(child); 2455 child.setAnimation(a); 2456 } 2457 2458 /** 2459 * Subclasses should override this method to set layout animation 2460 * parameters on the supplied child. 2461 * 2462 * @param child the child to associate with animation parameters 2463 * @param params the child's layout parameters which hold the animation 2464 * parameters 2465 * @param index the index of the child in the view group 2466 * @param count the number of children in the view group 2467 */ 2468 protected void attachLayoutAnimationParameters(View child, 2469 LayoutParams params, int index, int count) { 2470 LayoutAnimationController.AnimationParameters animationParams = 2471 params.layoutAnimationParameters; 2472 if (animationParams == null) { 2473 animationParams = new LayoutAnimationController.AnimationParameters(); 2474 params.layoutAnimationParameters = animationParams; 2475 } 2476 2477 animationParams.count = count; 2478 animationParams.index = index; 2479 } 2480 2481 /** 2482 * {@inheritDoc} 2483 */ 2484 public void removeView(View view) { 2485 removeViewInternal(view); 2486 requestLayout(); 2487 invalidate(); 2488 } 2489 2490 /** 2491 * Removes a view during layout. This is useful if in your onLayout() method, 2492 * you need to remove more views. 2493 * 2494 * @param view the view to remove from the group 2495 */ 2496 public void removeViewInLayout(View view) { 2497 removeViewInternal(view); 2498 } 2499 2500 /** 2501 * Removes a range of views during layout. This is useful if in your onLayout() method, 2502 * you need to remove more views. 2503 * 2504 * @param start the index of the first view to remove from the group 2505 * @param count the number of views to remove from the group 2506 */ 2507 public void removeViewsInLayout(int start, int count) { 2508 removeViewsInternal(start, count); 2509 } 2510 2511 /** 2512 * Removes the view at the specified position in the group. 2513 * 2514 * @param index the position in the group of the view to remove 2515 */ 2516 public void removeViewAt(int index) { 2517 removeViewInternal(index, getChildAt(index)); 2518 requestLayout(); 2519 invalidate(); 2520 } 2521 2522 /** 2523 * Removes the specified range of views from the group. 2524 * 2525 * @param start the first position in the group of the range of views to remove 2526 * @param count the number of views to remove 2527 */ 2528 public void removeViews(int start, int count) { 2529 removeViewsInternal(start, count); 2530 requestLayout(); 2531 invalidate(); 2532 } 2533 2534 private void removeViewInternal(View view) { 2535 final int index = indexOfChild(view); 2536 if (index >= 0) { 2537 removeViewInternal(index, view); 2538 } 2539 } 2540 2541 private void removeViewInternal(int index, View view) { 2542 boolean clearChildFocus = false; 2543 if (view == mFocused) { 2544 view.clearFocusForRemoval(); 2545 clearChildFocus = true; 2546 } 2547 2548 if (view.getAnimation() != null) { 2549 addDisappearingView(view); 2550 } else if (view.mAttachInfo != null) { 2551 view.dispatchDetachedFromWindow(); 2552 } 2553 2554 if (mOnHierarchyChangeListener != null) { 2555 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2556 } 2557 2558 needGlobalAttributesUpdate(false); 2559 2560 removeFromArray(index); 2561 2562 if (clearChildFocus) { 2563 clearChildFocus(view); 2564 } 2565 } 2566 2567 private void removeViewsInternal(int start, int count) { 2568 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2569 final boolean notifyListener = onHierarchyChangeListener != null; 2570 final View focused = mFocused; 2571 final boolean detach = mAttachInfo != null; 2572 View clearChildFocus = null; 2573 2574 final View[] children = mChildren; 2575 final int end = start + count; 2576 2577 for (int i = start; i < end; i++) { 2578 final View view = children[i]; 2579 2580 if (view == focused) { 2581 view.clearFocusForRemoval(); 2582 clearChildFocus = view; 2583 } 2584 2585 if (view.getAnimation() != null) { 2586 addDisappearingView(view); 2587 } else if (detach) { 2588 view.dispatchDetachedFromWindow(); 2589 } 2590 2591 needGlobalAttributesUpdate(false); 2592 2593 if (notifyListener) { 2594 onHierarchyChangeListener.onChildViewRemoved(this, view); 2595 } 2596 } 2597 2598 removeFromArray(start, count); 2599 2600 if (clearChildFocus != null) { 2601 clearChildFocus(clearChildFocus); 2602 } 2603 } 2604 2605 /** 2606 * Call this method to remove all child views from the 2607 * ViewGroup. 2608 */ 2609 public void removeAllViews() { 2610 removeAllViewsInLayout(); 2611 requestLayout(); 2612 invalidate(); 2613 } 2614 2615 /** 2616 * Called by a ViewGroup subclass to remove child views from itself, 2617 * when it must first know its size on screen before it can calculate how many 2618 * child views it will render. An example is a Gallery or a ListView, which 2619 * may "have" 50 children, but actually only render the number of children 2620 * that can currently fit inside the object on screen. Do not call 2621 * this method unless you are extending ViewGroup and understand the 2622 * view measuring and layout pipeline. 2623 */ 2624 public void removeAllViewsInLayout() { 2625 final int count = mChildrenCount; 2626 if (count <= 0) { 2627 return; 2628 } 2629 2630 final View[] children = mChildren; 2631 mChildrenCount = 0; 2632 2633 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2634 final boolean notify = listener != null; 2635 final View focused = mFocused; 2636 final boolean detach = mAttachInfo != null; 2637 View clearChildFocus = null; 2638 2639 needGlobalAttributesUpdate(false); 2640 2641 for (int i = count - 1; i >= 0; i--) { 2642 final View view = children[i]; 2643 2644 if (view == focused) { 2645 view.clearFocusForRemoval(); 2646 clearChildFocus = view; 2647 } 2648 2649 if (view.getAnimation() != null) { 2650 addDisappearingView(view); 2651 } else if (detach) { 2652 view.dispatchDetachedFromWindow(); 2653 } 2654 2655 if (notify) { 2656 listener.onChildViewRemoved(this, view); 2657 } 2658 2659 view.mParent = null; 2660 children[i] = null; 2661 } 2662 2663 if (clearChildFocus != null) { 2664 clearChildFocus(clearChildFocus); 2665 } 2666 } 2667 2668 /** 2669 * Finishes the removal of a detached view. This method will dispatch the detached from 2670 * window event and notify the hierarchy change listener. 2671 * 2672 * @param child the child to be definitely removed from the view hierarchy 2673 * @param animate if true and the view has an animation, the view is placed in the 2674 * disappearing views list, otherwise, it is detached from the window 2675 * 2676 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2677 * @see #detachAllViewsFromParent() 2678 * @see #detachViewFromParent(View) 2679 * @see #detachViewFromParent(int) 2680 */ 2681 protected void removeDetachedView(View child, boolean animate) { 2682 if (child == mFocused) { 2683 child.clearFocus(); 2684 } 2685 2686 if (animate && child.getAnimation() != null) { 2687 addDisappearingView(child); 2688 } else if (child.mAttachInfo != null) { 2689 child.dispatchDetachedFromWindow(); 2690 } 2691 2692 if (mOnHierarchyChangeListener != null) { 2693 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2694 } 2695 } 2696 2697 /** 2698 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2699 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2700 * by calling {@link #getChildAt(int)}. 2701 * 2702 * This method should be called only for view which were detached from their parent. 2703 * 2704 * @param child the child to attach 2705 * @param index the index at which the child should be attached 2706 * @param params the layout parameters of the child 2707 * 2708 * @see #removeDetachedView(View, boolean) 2709 * @see #detachAllViewsFromParent() 2710 * @see #detachViewFromParent(View) 2711 * @see #detachViewFromParent(int) 2712 */ 2713 protected void attachViewToParent(View child, int index, LayoutParams params) { 2714 child.mLayoutParams = params; 2715 2716 if (index < 0) { 2717 index = mChildrenCount; 2718 } 2719 2720 addInArray(child, index); 2721 2722 child.mParent = this; 2723 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | DRAWN; 2724 2725 if (child.hasFocus()) { 2726 requestChildFocus(child, child.findFocus()); 2727 } 2728 } 2729 2730 /** 2731 * Detaches a view from its parent. Detaching a view should be temporary and followed 2732 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2733 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2734 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2735 * 2736 * @param child the child to detach 2737 * 2738 * @see #detachViewFromParent(int) 2739 * @see #detachViewsFromParent(int, int) 2740 * @see #detachAllViewsFromParent() 2741 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2742 * @see #removeDetachedView(View, boolean) 2743 */ 2744 protected void detachViewFromParent(View child) { 2745 removeFromArray(indexOfChild(child)); 2746 } 2747 2748 /** 2749 * Detaches a view from its parent. Detaching a view should be temporary and followed 2750 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2751 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2752 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2753 * 2754 * @param index the index of the child to detach 2755 * 2756 * @see #detachViewFromParent(View) 2757 * @see #detachAllViewsFromParent() 2758 * @see #detachViewsFromParent(int, int) 2759 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2760 * @see #removeDetachedView(View, boolean) 2761 */ 2762 protected void detachViewFromParent(int index) { 2763 removeFromArray(index); 2764 } 2765 2766 /** 2767 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2768 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2769 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2770 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2771 * 2772 * @param start the first index of the childrend range to detach 2773 * @param count the number of children to detach 2774 * 2775 * @see #detachViewFromParent(View) 2776 * @see #detachViewFromParent(int) 2777 * @see #detachAllViewsFromParent() 2778 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2779 * @see #removeDetachedView(View, boolean) 2780 */ 2781 protected void detachViewsFromParent(int start, int count) { 2782 removeFromArray(start, count); 2783 } 2784 2785 /** 2786 * Detaches all views from the parent. Detaching a view should be temporary and followed 2787 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2788 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2789 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2790 * 2791 * @see #detachViewFromParent(View) 2792 * @see #detachViewFromParent(int) 2793 * @see #detachViewsFromParent(int, int) 2794 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2795 * @see #removeDetachedView(View, boolean) 2796 */ 2797 protected void detachAllViewsFromParent() { 2798 final int count = mChildrenCount; 2799 if (count <= 0) { 2800 return; 2801 } 2802 2803 final View[] children = mChildren; 2804 mChildrenCount = 0; 2805 2806 for (int i = count - 1; i >= 0; i--) { 2807 children[i].mParent = null; 2808 children[i] = null; 2809 } 2810 } 2811 2812 /** 2813 * Don't call or override this method. It is used for the implementation of 2814 * the view hierarchy. 2815 */ 2816 public final void invalidateChild(View child, final Rect dirty) { 2817 if (ViewDebug.TRACE_HIERARCHY) { 2818 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2819 } 2820 2821 ViewParent parent = this; 2822 2823 final AttachInfo attachInfo = mAttachInfo; 2824 if (attachInfo != null) { 2825 final int[] location = attachInfo.mInvalidateChildLocation; 2826 location[CHILD_LEFT_INDEX] = child.mLeft; 2827 location[CHILD_TOP_INDEX] = child.mTop; 2828 Matrix childMatrix = child.getMatrix(); 2829 if (!childMatrix.isIdentity()) { 2830 RectF boundingRect = attachInfo.mTmpTransformRect; 2831 boundingRect.set(dirty); 2832 childMatrix.mapRect(boundingRect); 2833 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2834 (int) (boundingRect.right + 0.5f), 2835 (int) (boundingRect.bottom + 0.5f)); 2836 } 2837 2838 // If the child is drawing an animation, we want to copy this flag onto 2839 // ourselves and the parent to make sure the invalidate request goes 2840 // through 2841 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2842 2843 // Check whether the child that requests the invalidate is fully opaque 2844 final boolean isOpaque = child.isOpaque() && !drawAnimation && 2845 child.getAnimation() != null; 2846 // Mark the child as dirty, using the appropriate flag 2847 // Make sure we do not set both flags at the same time 2848 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2849 2850 do { 2851 View view = null; 2852 if (parent instanceof View) { 2853 view = (View) parent; 2854 } 2855 2856 if (drawAnimation) { 2857 if (view != null) { 2858 view.mPrivateFlags |= DRAW_ANIMATION; 2859 } else if (parent instanceof ViewRoot) { 2860 ((ViewRoot) parent).mIsAnimating = true; 2861 } 2862 } 2863 2864 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2865 // flag coming from the child that initiated the invalidate 2866 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2867 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2868 } 2869 2870 parent = parent.invalidateChildInParent(location, dirty); 2871 if (view != null) { 2872 // Account for transform on current parent 2873 Matrix m = view.getMatrix(); 2874 if (!m.isIdentity()) { 2875 RectF boundingRect = attachInfo.mTmpTransformRect; 2876 boundingRect.set(dirty); 2877 m.mapRect(boundingRect); 2878 dirty.set((int) boundingRect.left, (int) boundingRect.top, 2879 (int) (boundingRect.right + 0.5f), 2880 (int) (boundingRect.bottom + 0.5f)); 2881 } 2882 } 2883 } while (parent != null); 2884 } 2885 } 2886 2887 /** 2888 * Don't call or override this method. It is used for the implementation of 2889 * the view hierarchy. 2890 * 2891 * This implementation returns null if this ViewGroup does not have a parent, 2892 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2893 * does not intersect with this ViewGroup's bounds. 2894 */ 2895 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2896 if (ViewDebug.TRACE_HIERARCHY) { 2897 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2898 } 2899 2900 if ((mPrivateFlags & DRAWN) == DRAWN) { 2901 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2902 FLAG_OPTIMIZE_INVALIDATE) { 2903 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2904 location[CHILD_TOP_INDEX] - mScrollY); 2905 2906 final int left = mLeft; 2907 final int top = mTop; 2908 2909 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2910 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2911 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2912 2913 location[CHILD_LEFT_INDEX] = left; 2914 location[CHILD_TOP_INDEX] = top; 2915 2916 return mParent; 2917 } 2918 } else { 2919 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2920 2921 location[CHILD_LEFT_INDEX] = mLeft; 2922 location[CHILD_TOP_INDEX] = mTop; 2923 2924 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2925 mBottom - location[CHILD_TOP_INDEX]); 2926 2927 return mParent; 2928 } 2929 } 2930 2931 return null; 2932 } 2933 2934 /** 2935 * Offset a rectangle that is in a descendant's coordinate 2936 * space into our coordinate space. 2937 * @param descendant A descendant of this view 2938 * @param rect A rectangle defined in descendant's coordinate space. 2939 */ 2940 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 2941 offsetRectBetweenParentAndChild(descendant, rect, true, false); 2942 } 2943 2944 /** 2945 * Offset a rectangle that is in our coordinate space into an ancestor's 2946 * coordinate space. 2947 * @param descendant A descendant of this view 2948 * @param rect A rectangle defined in descendant's coordinate space. 2949 */ 2950 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 2951 offsetRectBetweenParentAndChild(descendant, rect, false, false); 2952 } 2953 2954 /** 2955 * Helper method that offsets a rect either from parent to descendant or 2956 * descendant to parent. 2957 */ 2958 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 2959 boolean offsetFromChildToParent, boolean clipToBounds) { 2960 2961 // already in the same coord system :) 2962 if (descendant == this) { 2963 return; 2964 } 2965 2966 ViewParent theParent = descendant.mParent; 2967 2968 // search and offset up to the parent 2969 while ((theParent != null) 2970 && (theParent instanceof View) 2971 && (theParent != this)) { 2972 2973 if (offsetFromChildToParent) { 2974 rect.offset(descendant.mLeft - descendant.mScrollX, 2975 descendant.mTop - descendant.mScrollY); 2976 if (clipToBounds) { 2977 View p = (View) theParent; 2978 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2979 } 2980 } else { 2981 if (clipToBounds) { 2982 View p = (View) theParent; 2983 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2984 } 2985 rect.offset(descendant.mScrollX - descendant.mLeft, 2986 descendant.mScrollY - descendant.mTop); 2987 } 2988 2989 descendant = (View) theParent; 2990 theParent = descendant.mParent; 2991 } 2992 2993 // now that we are up to this view, need to offset one more time 2994 // to get into our coordinate space 2995 if (theParent == this) { 2996 if (offsetFromChildToParent) { 2997 rect.offset(descendant.mLeft - descendant.mScrollX, 2998 descendant.mTop - descendant.mScrollY); 2999 } else { 3000 rect.offset(descendant.mScrollX - descendant.mLeft, 3001 descendant.mScrollY - descendant.mTop); 3002 } 3003 } else { 3004 throw new IllegalArgumentException("parameter must be a descendant of this view"); 3005 } 3006 } 3007 3008 /** 3009 * Offset the vertical location of all children of this view by the specified number of pixels. 3010 * 3011 * @param offset the number of pixels to offset 3012 * 3013 * @hide 3014 */ 3015 public void offsetChildrenTopAndBottom(int offset) { 3016 final int count = mChildrenCount; 3017 final View[] children = mChildren; 3018 3019 for (int i = 0; i < count; i++) { 3020 final View v = children[i]; 3021 v.mTop += offset; 3022 v.mBottom += offset; 3023 } 3024 } 3025 3026 /** 3027 * {@inheritDoc} 3028 */ 3029 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 3030 int dx = child.mLeft - mScrollX; 3031 int dy = child.mTop - mScrollY; 3032 if (offset != null) { 3033 offset.x += dx; 3034 offset.y += dy; 3035 } 3036 r.offset(dx, dy); 3037 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 3038 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 3039 } 3040 3041 /** 3042 * {@inheritDoc} 3043 */ 3044 @Override 3045 protected abstract void onLayout(boolean changed, 3046 int l, int t, int r, int b); 3047 3048 /** 3049 * Indicates whether the view group has the ability to animate its children 3050 * after the first layout. 3051 * 3052 * @return true if the children can be animated, false otherwise 3053 */ 3054 protected boolean canAnimate() { 3055 return mLayoutAnimationController != null; 3056 } 3057 3058 /** 3059 * Runs the layout animation. Calling this method triggers a relayout of 3060 * this view group. 3061 */ 3062 public void startLayoutAnimation() { 3063 if (mLayoutAnimationController != null) { 3064 mGroupFlags |= FLAG_RUN_ANIMATION; 3065 requestLayout(); 3066 } 3067 } 3068 3069 /** 3070 * Schedules the layout animation to be played after the next layout pass 3071 * of this view group. This can be used to restart the layout animation 3072 * when the content of the view group changes or when the activity is 3073 * paused and resumed. 3074 */ 3075 public void scheduleLayoutAnimation() { 3076 mGroupFlags |= FLAG_RUN_ANIMATION; 3077 } 3078 3079 /** 3080 * Sets the layout animation controller used to animate the group's 3081 * children after the first layout. 3082 * 3083 * @param controller the animation controller 3084 */ 3085 public void setLayoutAnimation(LayoutAnimationController controller) { 3086 mLayoutAnimationController = controller; 3087 if (mLayoutAnimationController != null) { 3088 mGroupFlags |= FLAG_RUN_ANIMATION; 3089 } 3090 } 3091 3092 /** 3093 * Returns the layout animation controller used to animate the group's 3094 * children. 3095 * 3096 * @return the current animation controller 3097 */ 3098 public LayoutAnimationController getLayoutAnimation() { 3099 return mLayoutAnimationController; 3100 } 3101 3102 /** 3103 * Indicates whether the children's drawing cache is used during a layout 3104 * animation. By default, the drawing cache is enabled but this will prevent 3105 * nested layout animations from working. To nest animations, you must disable 3106 * the cache. 3107 * 3108 * @return true if the animation cache is enabled, false otherwise 3109 * 3110 * @see #setAnimationCacheEnabled(boolean) 3111 * @see View#setDrawingCacheEnabled(boolean) 3112 */ 3113 @ViewDebug.ExportedProperty 3114 public boolean isAnimationCacheEnabled() { 3115 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3116 } 3117 3118 /** 3119 * Enables or disables the children's drawing cache during a layout animation. 3120 * By default, the drawing cache is enabled but this will prevent nested 3121 * layout animations from working. To nest animations, you must disable the 3122 * cache. 3123 * 3124 * @param enabled true to enable the animation cache, false otherwise 3125 * 3126 * @see #isAnimationCacheEnabled() 3127 * @see View#setDrawingCacheEnabled(boolean) 3128 */ 3129 public void setAnimationCacheEnabled(boolean enabled) { 3130 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 3131 } 3132 3133 /** 3134 * Indicates whether this ViewGroup will always try to draw its children using their 3135 * drawing cache. By default this property is enabled. 3136 * 3137 * @return true if the animation cache is enabled, false otherwise 3138 * 3139 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3140 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3141 * @see View#setDrawingCacheEnabled(boolean) 3142 */ 3143 @ViewDebug.ExportedProperty(category = "drawing") 3144 public boolean isAlwaysDrawnWithCacheEnabled() { 3145 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 3146 } 3147 3148 /** 3149 * Indicates whether this ViewGroup will always try to draw its children using their 3150 * drawing cache. This property can be set to true when the cache rendering is 3151 * slightly different from the children's normal rendering. Renderings can be different, 3152 * for instance, when the cache's quality is set to low. 3153 * 3154 * When this property is disabled, the ViewGroup will use the drawing cache of its 3155 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 3156 * when to start using the drawing cache and when to stop using it. 3157 * 3158 * @param always true to always draw with the drawing cache, false otherwise 3159 * 3160 * @see #isAlwaysDrawnWithCacheEnabled() 3161 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3162 * @see View#setDrawingCacheEnabled(boolean) 3163 * @see View#setDrawingCacheQuality(int) 3164 */ 3165 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 3166 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 3167 } 3168 3169 /** 3170 * Indicates whether the ViewGroup is currently drawing its children using 3171 * their drawing cache. 3172 * 3173 * @return true if children should be drawn with their cache, false otherwise 3174 * 3175 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3176 * @see #setChildrenDrawnWithCacheEnabled(boolean) 3177 */ 3178 @ViewDebug.ExportedProperty(category = "drawing") 3179 protected boolean isChildrenDrawnWithCacheEnabled() { 3180 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 3181 } 3182 3183 /** 3184 * Tells the ViewGroup to draw its children using their drawing cache. This property 3185 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 3186 * will be used only if it has been enabled. 3187 * 3188 * Subclasses should call this method to start and stop using the drawing cache when 3189 * they perform performance sensitive operations, like scrolling or animating. 3190 * 3191 * @param enabled true if children should be drawn with their cache, false otherwise 3192 * 3193 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 3194 * @see #isChildrenDrawnWithCacheEnabled() 3195 */ 3196 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 3197 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 3198 } 3199 3200 /** 3201 * Indicates whether the ViewGroup is drawing its children in the order defined by 3202 * {@link #getChildDrawingOrder(int, int)}. 3203 * 3204 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 3205 * false otherwise 3206 * 3207 * @see #setChildrenDrawingOrderEnabled(boolean) 3208 * @see #getChildDrawingOrder(int, int) 3209 */ 3210 @ViewDebug.ExportedProperty(category = "drawing") 3211 protected boolean isChildrenDrawingOrderEnabled() { 3212 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 3213 } 3214 3215 /** 3216 * Tells the ViewGroup whether to draw its children in the order defined by the method 3217 * {@link #getChildDrawingOrder(int, int)}. 3218 * 3219 * @param enabled true if the order of the children when drawing is determined by 3220 * {@link #getChildDrawingOrder(int, int)}, false otherwise 3221 * 3222 * @see #isChildrenDrawingOrderEnabled() 3223 * @see #getChildDrawingOrder(int, int) 3224 */ 3225 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 3226 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 3227 } 3228 3229 private void setBooleanFlag(int flag, boolean value) { 3230 if (value) { 3231 mGroupFlags |= flag; 3232 } else { 3233 mGroupFlags &= ~flag; 3234 } 3235 } 3236 3237 /** 3238 * Returns an integer indicating what types of drawing caches are kept in memory. 3239 * 3240 * @see #setPersistentDrawingCache(int) 3241 * @see #setAnimationCacheEnabled(boolean) 3242 * 3243 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 3244 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3245 * and {@link #PERSISTENT_ALL_CACHES} 3246 */ 3247 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3248 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 3249 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 3250 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 3251 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 3252 }) 3253 public int getPersistentDrawingCache() { 3254 return mPersistentDrawingCache; 3255 } 3256 3257 /** 3258 * Indicates what types of drawing caches should be kept in memory after 3259 * they have been created. 3260 * 3261 * @see #getPersistentDrawingCache() 3262 * @see #setAnimationCacheEnabled(boolean) 3263 * 3264 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 3265 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 3266 * and {@link #PERSISTENT_ALL_CACHES} 3267 */ 3268 public void setPersistentDrawingCache(int drawingCacheToKeep) { 3269 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 3270 } 3271 3272 /** 3273 * Returns a new set of layout parameters based on the supplied attributes set. 3274 * 3275 * @param attrs the attributes to build the layout parameters from 3276 * 3277 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3278 * of its descendants 3279 */ 3280 public LayoutParams generateLayoutParams(AttributeSet attrs) { 3281 return new LayoutParams(getContext(), attrs); 3282 } 3283 3284 /** 3285 * Returns a safe set of layout parameters based on the supplied layout params. 3286 * When a ViewGroup is passed a View whose layout params do not pass the test of 3287 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 3288 * is invoked. This method should return a new set of layout params suitable for 3289 * this ViewGroup, possibly by copying the appropriate attributes from the 3290 * specified set of layout params. 3291 * 3292 * @param p The layout parameters to convert into a suitable set of layout parameters 3293 * for this ViewGroup. 3294 * 3295 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 3296 * of its descendants 3297 */ 3298 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3299 return p; 3300 } 3301 3302 /** 3303 * Returns a set of default layout parameters. These parameters are requested 3304 * when the View passed to {@link #addView(View)} has no layout parameters 3305 * already set. If null is returned, an exception is thrown from addView. 3306 * 3307 * @return a set of default layout parameters or null 3308 */ 3309 protected LayoutParams generateDefaultLayoutParams() { 3310 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 3311 } 3312 3313 /** 3314 * @hide 3315 */ 3316 @Override 3317 protected boolean dispatchConsistencyCheck(int consistency) { 3318 boolean result = super.dispatchConsistencyCheck(consistency); 3319 3320 final int count = mChildrenCount; 3321 final View[] children = mChildren; 3322 for (int i = 0; i < count; i++) { 3323 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 3324 } 3325 3326 return result; 3327 } 3328 3329 /** 3330 * @hide 3331 */ 3332 @Override 3333 protected boolean onConsistencyCheck(int consistency) { 3334 boolean result = super.onConsistencyCheck(consistency); 3335 3336 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 3337 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 3338 3339 if (checkLayout) { 3340 final int count = mChildrenCount; 3341 final View[] children = mChildren; 3342 for (int i = 0; i < count; i++) { 3343 if (children[i].getParent() != this) { 3344 result = false; 3345 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3346 "View " + children[i] + " has no parent/a parent that is not " + this); 3347 } 3348 } 3349 } 3350 3351 if (checkDrawing) { 3352 // If this group is dirty, check that the parent is dirty as well 3353 if ((mPrivateFlags & DIRTY_MASK) != 0) { 3354 final ViewParent parent = getParent(); 3355 if (parent != null && !(parent instanceof ViewRoot)) { 3356 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 3357 result = false; 3358 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 3359 "ViewGroup " + this + " is dirty but its parent is not: " + this); 3360 } 3361 } 3362 } 3363 } 3364 3365 return result; 3366 } 3367 3368 /** 3369 * {@inheritDoc} 3370 */ 3371 @Override 3372 protected void debug(int depth) { 3373 super.debug(depth); 3374 String output; 3375 3376 if (mFocused != null) { 3377 output = debugIndent(depth); 3378 output += "mFocused"; 3379 Log.d(VIEW_LOG_TAG, output); 3380 } 3381 if (mChildrenCount != 0) { 3382 output = debugIndent(depth); 3383 output += "{"; 3384 Log.d(VIEW_LOG_TAG, output); 3385 } 3386 int count = mChildrenCount; 3387 for (int i = 0; i < count; i++) { 3388 View child = mChildren[i]; 3389 child.debug(depth + 1); 3390 } 3391 3392 if (mChildrenCount != 0) { 3393 output = debugIndent(depth); 3394 output += "}"; 3395 Log.d(VIEW_LOG_TAG, output); 3396 } 3397 } 3398 3399 /** 3400 * Returns the position in the group of the specified child view. 3401 * 3402 * @param child the view for which to get the position 3403 * @return a positive integer representing the position of the view in the 3404 * group, or -1 if the view does not exist in the group 3405 */ 3406 public int indexOfChild(View child) { 3407 final int count = mChildrenCount; 3408 final View[] children = mChildren; 3409 for (int i = 0; i < count; i++) { 3410 if (children[i] == child) { 3411 return i; 3412 } 3413 } 3414 return -1; 3415 } 3416 3417 /** 3418 * Returns the number of children in the group. 3419 * 3420 * @return a positive integer representing the number of children in 3421 * the group 3422 */ 3423 public int getChildCount() { 3424 return mChildrenCount; 3425 } 3426 3427 /** 3428 * Returns the view at the specified position in the group. 3429 * 3430 * @param index the position at which to get the view from 3431 * @return the view at the specified position or null if the position 3432 * does not exist within the group 3433 */ 3434 public View getChildAt(int index) { 3435 try { 3436 return mChildren[index]; 3437 } catch (IndexOutOfBoundsException ex) { 3438 return null; 3439 } 3440 } 3441 3442 /** 3443 * Ask all of the children of this view to measure themselves, taking into 3444 * account both the MeasureSpec requirements for this view and its padding. 3445 * We skip children that are in the GONE state The heavy lifting is done in 3446 * getChildMeasureSpec. 3447 * 3448 * @param widthMeasureSpec The width requirements for this view 3449 * @param heightMeasureSpec The height requirements for this view 3450 */ 3451 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 3452 final int size = mChildrenCount; 3453 final View[] children = mChildren; 3454 for (int i = 0; i < size; ++i) { 3455 final View child = children[i]; 3456 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 3457 measureChild(child, widthMeasureSpec, heightMeasureSpec); 3458 } 3459 } 3460 } 3461 3462 /** 3463 * Ask one of the children of this view to measure itself, taking into 3464 * account both the MeasureSpec requirements for this view and its padding. 3465 * The heavy lifting is done in getChildMeasureSpec. 3466 * 3467 * @param child The child to measure 3468 * @param parentWidthMeasureSpec The width requirements for this view 3469 * @param parentHeightMeasureSpec The height requirements for this view 3470 */ 3471 protected void measureChild(View child, int parentWidthMeasureSpec, 3472 int parentHeightMeasureSpec) { 3473 final LayoutParams lp = child.getLayoutParams(); 3474 3475 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3476 mPaddingLeft + mPaddingRight, lp.width); 3477 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3478 mPaddingTop + mPaddingBottom, lp.height); 3479 3480 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3481 } 3482 3483 /** 3484 * Ask one of the children of this view to measure itself, taking into 3485 * account both the MeasureSpec requirements for this view and its padding 3486 * and margins. The child must have MarginLayoutParams The heavy lifting is 3487 * done in getChildMeasureSpec. 3488 * 3489 * @param child The child to measure 3490 * @param parentWidthMeasureSpec The width requirements for this view 3491 * @param widthUsed Extra space that has been used up by the parent 3492 * horizontally (possibly by other children of the parent) 3493 * @param parentHeightMeasureSpec The height requirements for this view 3494 * @param heightUsed Extra space that has been used up by the parent 3495 * vertically (possibly by other children of the parent) 3496 */ 3497 protected void measureChildWithMargins(View child, 3498 int parentWidthMeasureSpec, int widthUsed, 3499 int parentHeightMeasureSpec, int heightUsed) { 3500 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 3501 3502 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 3503 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 3504 + widthUsed, lp.width); 3505 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 3506 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 3507 + heightUsed, lp.height); 3508 3509 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 3510 } 3511 3512 /** 3513 * Does the hard part of measureChildren: figuring out the MeasureSpec to 3514 * pass to a particular child. This method figures out the right MeasureSpec 3515 * for one dimension (height or width) of one child view. 3516 * 3517 * The goal is to combine information from our MeasureSpec with the 3518 * LayoutParams of the child to get the best possible results. For example, 3519 * if the this view knows its size (because its MeasureSpec has a mode of 3520 * EXACTLY), and the child has indicated in its LayoutParams that it wants 3521 * to be the same size as the parent, the parent should ask the child to 3522 * layout given an exact size. 3523 * 3524 * @param spec The requirements for this view 3525 * @param padding The padding of this view for the current dimension and 3526 * margins, if applicable 3527 * @param childDimension How big the child wants to be in the current 3528 * dimension 3529 * @return a MeasureSpec integer for the child 3530 */ 3531 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3532 int specMode = MeasureSpec.getMode(spec); 3533 int specSize = MeasureSpec.getSize(spec); 3534 3535 int size = Math.max(0, specSize - padding); 3536 3537 int resultSize = 0; 3538 int resultMode = 0; 3539 3540 switch (specMode) { 3541 // Parent has imposed an exact size on us 3542 case MeasureSpec.EXACTLY: 3543 if (childDimension >= 0) { 3544 resultSize = childDimension; 3545 resultMode = MeasureSpec.EXACTLY; 3546 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3547 // Child wants to be our size. So be it. 3548 resultSize = size; 3549 resultMode = MeasureSpec.EXACTLY; 3550 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3551 // Child wants to determine its own size. It can't be 3552 // bigger than us. 3553 resultSize = size; 3554 resultMode = MeasureSpec.AT_MOST; 3555 } 3556 break; 3557 3558 // Parent has imposed a maximum size on us 3559 case MeasureSpec.AT_MOST: 3560 if (childDimension >= 0) { 3561 // Child wants a specific size... so be it 3562 resultSize = childDimension; 3563 resultMode = MeasureSpec.EXACTLY; 3564 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3565 // Child wants to be our size, but our size is not fixed. 3566 // Constrain child to not be bigger than us. 3567 resultSize = size; 3568 resultMode = MeasureSpec.AT_MOST; 3569 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3570 // Child wants to determine its own size. It can't be 3571 // bigger than us. 3572 resultSize = size; 3573 resultMode = MeasureSpec.AT_MOST; 3574 } 3575 break; 3576 3577 // Parent asked to see how big we want to be 3578 case MeasureSpec.UNSPECIFIED: 3579 if (childDimension >= 0) { 3580 // Child wants a specific size... let him have it 3581 resultSize = childDimension; 3582 resultMode = MeasureSpec.EXACTLY; 3583 } else if (childDimension == LayoutParams.MATCH_PARENT) { 3584 // Child wants to be our size... find out how big it should 3585 // be 3586 resultSize = 0; 3587 resultMode = MeasureSpec.UNSPECIFIED; 3588 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3589 // Child wants to determine its own size.... find out how 3590 // big it should be 3591 resultSize = 0; 3592 resultMode = MeasureSpec.UNSPECIFIED; 3593 } 3594 break; 3595 } 3596 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3597 } 3598 3599 3600 /** 3601 * Removes any pending animations for views that have been removed. Call 3602 * this if you don't want animations for exiting views to stack up. 3603 */ 3604 public void clearDisappearingChildren() { 3605 if (mDisappearingChildren != null) { 3606 mDisappearingChildren.clear(); 3607 } 3608 } 3609 3610 /** 3611 * Add a view which is removed from mChildren but still needs animation 3612 * 3613 * @param v View to add 3614 */ 3615 private void addDisappearingView(View v) { 3616 ArrayList<View> disappearingChildren = mDisappearingChildren; 3617 3618 if (disappearingChildren == null) { 3619 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3620 } 3621 3622 disappearingChildren.add(v); 3623 } 3624 3625 /** 3626 * Cleanup a view when its animation is done. This may mean removing it from 3627 * the list of disappearing views. 3628 * 3629 * @param view The view whose animation has finished 3630 * @param animation The animation, cannot be null 3631 */ 3632 private void finishAnimatingView(final View view, Animation animation) { 3633 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3634 if (disappearingChildren != null) { 3635 if (disappearingChildren.contains(view)) { 3636 disappearingChildren.remove(view); 3637 3638 if (view.mAttachInfo != null) { 3639 view.dispatchDetachedFromWindow(); 3640 } 3641 3642 view.clearAnimation(); 3643 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3644 } 3645 } 3646 3647 if (animation != null && !animation.getFillAfter()) { 3648 view.clearAnimation(); 3649 } 3650 3651 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3652 view.onAnimationEnd(); 3653 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3654 // so we'd rather be safe than sorry 3655 view.mPrivateFlags &= ~ANIMATION_STARTED; 3656 // Draw one more frame after the animation is done 3657 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3658 } 3659 } 3660 3661 /** 3662 * {@inheritDoc} 3663 */ 3664 @Override 3665 public boolean gatherTransparentRegion(Region region) { 3666 // If no transparent regions requested, we are always opaque. 3667 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3668 if (meOpaque && region == null) { 3669 // The caller doesn't care about the region, so stop now. 3670 return true; 3671 } 3672 super.gatherTransparentRegion(region); 3673 final View[] children = mChildren; 3674 final int count = mChildrenCount; 3675 boolean noneOfTheChildrenAreTransparent = true; 3676 for (int i = 0; i < count; i++) { 3677 final View child = children[i]; 3678 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3679 if (!child.gatherTransparentRegion(region)) { 3680 noneOfTheChildrenAreTransparent = false; 3681 } 3682 } 3683 } 3684 return meOpaque || noneOfTheChildrenAreTransparent; 3685 } 3686 3687 /** 3688 * {@inheritDoc} 3689 */ 3690 public void requestTransparentRegion(View child) { 3691 if (child != null) { 3692 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3693 if (mParent != null) { 3694 mParent.requestTransparentRegion(this); 3695 } 3696 } 3697 } 3698 3699 3700 @Override 3701 protected boolean fitSystemWindows(Rect insets) { 3702 boolean done = super.fitSystemWindows(insets); 3703 if (!done) { 3704 final int count = mChildrenCount; 3705 final View[] children = mChildren; 3706 for (int i = 0; i < count; i++) { 3707 done = children[i].fitSystemWindows(insets); 3708 if (done) { 3709 break; 3710 } 3711 } 3712 } 3713 return done; 3714 } 3715 3716 /** 3717 * Returns the animation listener to which layout animation events are 3718 * sent. 3719 * 3720 * @return an {@link android.view.animation.Animation.AnimationListener} 3721 */ 3722 public Animation.AnimationListener getLayoutAnimationListener() { 3723 return mAnimationListener; 3724 } 3725 3726 @Override 3727 protected void drawableStateChanged() { 3728 super.drawableStateChanged(); 3729 3730 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3731 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3732 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3733 + " child has duplicateParentState set to true"); 3734 } 3735 3736 final View[] children = mChildren; 3737 final int count = mChildrenCount; 3738 3739 for (int i = 0; i < count; i++) { 3740 final View child = children[i]; 3741 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3742 child.refreshDrawableState(); 3743 } 3744 } 3745 } 3746 } 3747 3748 @Override 3749 protected int[] onCreateDrawableState(int extraSpace) { 3750 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3751 return super.onCreateDrawableState(extraSpace); 3752 } 3753 3754 int need = 0; 3755 int n = getChildCount(); 3756 for (int i = 0; i < n; i++) { 3757 int[] childState = getChildAt(i).getDrawableState(); 3758 3759 if (childState != null) { 3760 need += childState.length; 3761 } 3762 } 3763 3764 int[] state = super.onCreateDrawableState(extraSpace + need); 3765 3766 for (int i = 0; i < n; i++) { 3767 int[] childState = getChildAt(i).getDrawableState(); 3768 3769 if (childState != null) { 3770 state = mergeDrawableStates(state, childState); 3771 } 3772 } 3773 3774 return state; 3775 } 3776 3777 /** 3778 * Sets whether this ViewGroup's drawable states also include 3779 * its children's drawable states. This is used, for example, to 3780 * make a group appear to be focused when its child EditText or button 3781 * is focused. 3782 */ 3783 public void setAddStatesFromChildren(boolean addsStates) { 3784 if (addsStates) { 3785 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3786 } else { 3787 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3788 } 3789 3790 refreshDrawableState(); 3791 } 3792 3793 /** 3794 * Returns whether this ViewGroup's drawable states also include 3795 * its children's drawable states. This is used, for example, to 3796 * make a group appear to be focused when its child EditText or button 3797 * is focused. 3798 */ 3799 public boolean addStatesFromChildren() { 3800 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3801 } 3802 3803 /** 3804 * If {link #addStatesFromChildren} is true, refreshes this group's 3805 * drawable state (to include the states from its children). 3806 */ 3807 public void childDrawableStateChanged(View child) { 3808 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3809 refreshDrawableState(); 3810 } 3811 } 3812 3813 /** 3814 * Specifies the animation listener to which layout animation events must 3815 * be sent. Only 3816 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3817 * and 3818 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3819 * are invoked. 3820 * 3821 * @param animationListener the layout animation listener 3822 */ 3823 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3824 mAnimationListener = animationListener; 3825 } 3826 3827 /** 3828 * LayoutParams are used by views to tell their parents how they want to be 3829 * laid out. See 3830 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3831 * for a list of all child view attributes that this class supports. 3832 * 3833 * <p> 3834 * The base LayoutParams class just describes how big the view wants to be 3835 * for both width and height. For each dimension, it can specify one of: 3836 * <ul> 3837 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 3838 * means that the view wants to be as big as its parent (minus padding) 3839 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3840 * to enclose its content (plus padding) 3841 * <li> an exact number 3842 * </ul> 3843 * There are subclasses of LayoutParams for different subclasses of 3844 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3845 * LayoutParams which adds an X and Y value. 3846 * 3847 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3848 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3849 */ 3850 public static class LayoutParams { 3851 /** 3852 * Special value for the height or width requested by a View. 3853 * FILL_PARENT means that the view wants to be as big as its parent, 3854 * minus the parent's padding, if any. This value is deprecated 3855 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 3856 */ 3857 @SuppressWarnings({"UnusedDeclaration"}) 3858 @Deprecated 3859 public static final int FILL_PARENT = -1; 3860 3861 /** 3862 * Special value for the height or width requested by a View. 3863 * MATCH_PARENT means that the view wants to be as big as its parent, 3864 * minus the parent's padding, if any. Introduced in API Level 8. 3865 */ 3866 public static final int MATCH_PARENT = -1; 3867 3868 /** 3869 * Special value for the height or width requested by a View. 3870 * WRAP_CONTENT means that the view wants to be just large enough to fit 3871 * its own internal content, taking its own padding into account. 3872 */ 3873 public static final int WRAP_CONTENT = -2; 3874 3875 /** 3876 * Information about how wide the view wants to be. Can be one of the 3877 * constants FILL_PARENT (replaced by MATCH_PARENT , 3878 * in API Level 8) or WRAP_CONTENT. or an exact size. 3879 */ 3880 @ViewDebug.ExportedProperty(category = "layout", mapping = { 3881 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3882 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3883 }) 3884 public int width; 3885 3886 /** 3887 * Information about how tall the view wants to be. Can be one of the 3888 * constants FILL_PARENT (replaced by MATCH_PARENT , 3889 * in API Level 8) or WRAP_CONTENT. or an exact size. 3890 */ 3891 @ViewDebug.ExportedProperty(category = "layout", mapping = { 3892 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 3893 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3894 }) 3895 public int height; 3896 3897 /** 3898 * Used to animate layouts. 3899 */ 3900 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 3901 3902 /** 3903 * Creates a new set of layout parameters. The values are extracted from 3904 * the supplied attributes set and context. The XML attributes mapped 3905 * to this set of layout parameters are: 3906 * 3907 * <ul> 3908 * <li><code>layout_width</code>: the width, either an exact value, 3909 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3910 * {@link #MATCH_PARENT} in API Level 8)</li> 3911 * <li><code>layout_height</code>: the height, either an exact value, 3912 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 3913 * {@link #MATCH_PARENT} in API Level 8)</li> 3914 * </ul> 3915 * 3916 * @param c the application environment 3917 * @param attrs the set of attributes from which to extract the layout 3918 * parameters' values 3919 */ 3920 public LayoutParams(Context c, AttributeSet attrs) { 3921 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 3922 setBaseAttributes(a, 3923 R.styleable.ViewGroup_Layout_layout_width, 3924 R.styleable.ViewGroup_Layout_layout_height); 3925 a.recycle(); 3926 } 3927 3928 /** 3929 * Creates a new set of layout parameters with the specified width 3930 * and height. 3931 * 3932 * @param width the width, either {@link #WRAP_CONTENT}, 3933 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3934 * API Level 8), or a fixed size in pixels 3935 * @param height the height, either {@link #WRAP_CONTENT}, 3936 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 3937 * API Level 8), or a fixed size in pixels 3938 */ 3939 public LayoutParams(int width, int height) { 3940 this.width = width; 3941 this.height = height; 3942 } 3943 3944 /** 3945 * Copy constructor. Clones the width and height values of the source. 3946 * 3947 * @param source The layout params to copy from. 3948 */ 3949 public LayoutParams(LayoutParams source) { 3950 this.width = source.width; 3951 this.height = source.height; 3952 } 3953 3954 /** 3955 * Used internally by MarginLayoutParams. 3956 * @hide 3957 */ 3958 LayoutParams() { 3959 } 3960 3961 /** 3962 * Extracts the layout parameters from the supplied attributes. 3963 * 3964 * @param a the style attributes to extract the parameters from 3965 * @param widthAttr the identifier of the width attribute 3966 * @param heightAttr the identifier of the height attribute 3967 */ 3968 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 3969 width = a.getLayoutDimension(widthAttr, "layout_width"); 3970 height = a.getLayoutDimension(heightAttr, "layout_height"); 3971 } 3972 3973 /** 3974 * Returns a String representation of this set of layout parameters. 3975 * 3976 * @param output the String to prepend to the internal representation 3977 * @return a String with the following format: output + 3978 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 3979 * 3980 * @hide 3981 */ 3982 public String debug(String output) { 3983 return output + "ViewGroup.LayoutParams={ width=" 3984 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 3985 } 3986 3987 /** 3988 * Converts the specified size to a readable String. 3989 * 3990 * @param size the size to convert 3991 * @return a String instance representing the supplied size 3992 * 3993 * @hide 3994 */ 3995 protected static String sizeToString(int size) { 3996 if (size == WRAP_CONTENT) { 3997 return "wrap-content"; 3998 } 3999 if (size == MATCH_PARENT) { 4000 return "match-parent"; 4001 } 4002 return String.valueOf(size); 4003 } 4004 } 4005 4006 /** 4007 * Per-child layout information for layouts that support margins. 4008 * See 4009 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 4010 * for a list of all child view attributes that this class supports. 4011 */ 4012 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 4013 /** 4014 * The left margin in pixels of the child. 4015 */ 4016 @ViewDebug.ExportedProperty(category = "layout") 4017 public int leftMargin; 4018 4019 /** 4020 * The top margin in pixels of the child. 4021 */ 4022 @ViewDebug.ExportedProperty(category = "layout") 4023 public int topMargin; 4024 4025 /** 4026 * The right margin in pixels of the child. 4027 */ 4028 @ViewDebug.ExportedProperty(category = "layout") 4029 public int rightMargin; 4030 4031 /** 4032 * The bottom margin in pixels of the child. 4033 */ 4034 @ViewDebug.ExportedProperty(category = "layout") 4035 public int bottomMargin; 4036 4037 /** 4038 * Creates a new set of layout parameters. The values are extracted from 4039 * the supplied attributes set and context. 4040 * 4041 * @param c the application environment 4042 * @param attrs the set of attributes from which to extract the layout 4043 * parameters' values 4044 */ 4045 public MarginLayoutParams(Context c, AttributeSet attrs) { 4046 super(); 4047 4048 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 4049 setBaseAttributes(a, 4050 R.styleable.ViewGroup_MarginLayout_layout_width, 4051 R.styleable.ViewGroup_MarginLayout_layout_height); 4052 4053 int margin = a.getDimensionPixelSize( 4054 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 4055 if (margin >= 0) { 4056 leftMargin = margin; 4057 topMargin = margin; 4058 rightMargin= margin; 4059 bottomMargin = margin; 4060 } else { 4061 leftMargin = a.getDimensionPixelSize( 4062 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 4063 topMargin = a.getDimensionPixelSize( 4064 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 4065 rightMargin = a.getDimensionPixelSize( 4066 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 4067 bottomMargin = a.getDimensionPixelSize( 4068 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 4069 } 4070 4071 a.recycle(); 4072 } 4073 4074 /** 4075 * {@inheritDoc} 4076 */ 4077 public MarginLayoutParams(int width, int height) { 4078 super(width, height); 4079 } 4080 4081 /** 4082 * Copy constructor. Clones the width, height and margin values of the source. 4083 * 4084 * @param source The layout params to copy from. 4085 */ 4086 public MarginLayoutParams(MarginLayoutParams source) { 4087 this.width = source.width; 4088 this.height = source.height; 4089 4090 this.leftMargin = source.leftMargin; 4091 this.topMargin = source.topMargin; 4092 this.rightMargin = source.rightMargin; 4093 this.bottomMargin = source.bottomMargin; 4094 } 4095 4096 /** 4097 * {@inheritDoc} 4098 */ 4099 public MarginLayoutParams(LayoutParams source) { 4100 super(source); 4101 } 4102 4103 /** 4104 * Sets the margins, in pixels. 4105 * 4106 * @param left the left margin size 4107 * @param top the top margin size 4108 * @param right the right margin size 4109 * @param bottom the bottom margin size 4110 * 4111 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 4112 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 4113 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 4114 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 4115 */ 4116 public void setMargins(int left, int top, int right, int bottom) { 4117 leftMargin = left; 4118 topMargin = top; 4119 rightMargin = right; 4120 bottomMargin = bottom; 4121 } 4122 } 4123 4124 private static class SplitMotionTargets { 4125 private SparseArray<View> mTargets; 4126 private TargetInfo[] mUniqueTargets; 4127 private int mUniqueTargetCount; 4128 private MotionEvent.PointerCoords[] mPointerCoords; 4129 private int[] mPointerIds; 4130 4131 private static final int INITIAL_UNIQUE_MOTION_TARGETS_SIZE = 5; 4132 private static final int INITIAL_BUCKET_SIZE = 5; 4133 4134 public SplitMotionTargets() { 4135 mTargets = new SparseArray<View>(); 4136 mUniqueTargets = new TargetInfo[INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4137 mPointerIds = new int[INITIAL_BUCKET_SIZE]; 4138 mPointerCoords = new MotionEvent.PointerCoords[INITIAL_BUCKET_SIZE]; 4139 for (int i = 0; i < INITIAL_BUCKET_SIZE; i++) { 4140 mPointerCoords[i] = new MotionEvent.PointerCoords(); 4141 } 4142 } 4143 4144 public void clear() { 4145 mTargets.clear(); 4146 final int count = mUniqueTargetCount; 4147 for (int i = 0; i < count; i++) { 4148 mUniqueTargets[i].recycle(); 4149 mUniqueTargets[i] = null; 4150 } 4151 mUniqueTargetCount = 0; 4152 } 4153 4154 public void add(int pointerId, View target, long downTime) { 4155 mTargets.put(pointerId, target); 4156 4157 final int uniqueCount = mUniqueTargetCount; 4158 boolean addUnique = true; 4159 for (int i = 0; i < uniqueCount; i++) { 4160 if (mUniqueTargets[i].view == target) { 4161 addUnique = false; 4162 } 4163 } 4164 if (addUnique) { 4165 if (mUniqueTargets.length == uniqueCount) { 4166 TargetInfo[] newTargets = 4167 new TargetInfo[uniqueCount + INITIAL_UNIQUE_MOTION_TARGETS_SIZE]; 4168 System.arraycopy(mUniqueTargets, 0, newTargets, 0, uniqueCount); 4169 mUniqueTargets = newTargets; 4170 } 4171 mUniqueTargets[uniqueCount] = TargetInfo.obtain(target, downTime); 4172 mUniqueTargetCount++; 4173 } 4174 } 4175 4176 public int getIdCount() { 4177 return mTargets.size(); 4178 } 4179 4180 public int getUniqueTargetCount() { 4181 return mUniqueTargetCount; 4182 } 4183 4184 public TargetInfo getUniqueTargetAt(int index) { 4185 return mUniqueTargets[index]; 4186 } 4187 4188 public View get(int id) { 4189 return mTargets.get(id); 4190 } 4191 4192 public int indexOfTarget(View target) { 4193 return mTargets.indexOfValue(target); 4194 } 4195 4196 public View targetAt(int index) { 4197 return mTargets.valueAt(index); 4198 } 4199 4200 public TargetInfo getPrimaryTarget() { 4201 if (!isEmpty()) { 4202 // Find the longest-lived target 4203 long firstTime = Long.MAX_VALUE; 4204 int firstIndex = 0; 4205 final int uniqueCount = mUniqueTargetCount; 4206 for (int i = 0; i < uniqueCount; i++) { 4207 TargetInfo info = mUniqueTargets[i]; 4208 if (info.downTime < firstTime) { 4209 firstTime = info.downTime; 4210 firstIndex = i; 4211 } 4212 } 4213 return mUniqueTargets[firstIndex]; 4214 } 4215 return null; 4216 } 4217 4218 public boolean isEmpty() { 4219 return mUniqueTargetCount == 0; 4220 } 4221 4222 public void removeById(int id) { 4223 final int index = mTargets.indexOfKey(id); 4224 removeAt(index); 4225 } 4226 4227 public void removeView(View view) { 4228 int i = 0; 4229 while (i < mTargets.size()) { 4230 if (mTargets.valueAt(i) == view) { 4231 mTargets.removeAt(i); 4232 } else { 4233 i++; 4234 } 4235 } 4236 removeUnique(view); 4237 } 4238 4239 public void removeAt(int index) { 4240 if (index < 0 || index >= mTargets.size()) { 4241 return; 4242 } 4243 4244 final View removeView = mTargets.valueAt(index); 4245 mTargets.removeAt(index); 4246 if (mTargets.indexOfValue(removeView) < 0) { 4247 removeUnique(removeView); 4248 } 4249 } 4250 4251 private void removeUnique(View removeView) { 4252 TargetInfo[] unique = mUniqueTargets; 4253 int uniqueCount = mUniqueTargetCount; 4254 for (int i = 0; i < uniqueCount; i++) { 4255 if (unique[i].view == removeView) { 4256 unique[i].recycle(); 4257 unique[i] = unique[--uniqueCount]; 4258 unique[uniqueCount] = null; 4259 break; 4260 } 4261 } 4262 4263 mUniqueTargetCount = uniqueCount; 4264 } 4265 4266 /** 4267 * Return a new (obtain()ed) MotionEvent containing only data for pointers that should 4268 * be dispatched to child. Don't forget to recycle it! 4269 */ 4270 public MotionEvent filterMotionEventForChild(MotionEvent ev, View child, long downTime) { 4271 int action = ev.getAction(); 4272 final int maskedAction = action & MotionEvent.ACTION_MASK; 4273 4274 // Only send pointer up events if this child was the target. Drop it otherwise. 4275 if (maskedAction == MotionEvent.ACTION_POINTER_UP && 4276 get(ev.getPointerId(ev.getActionIndex())) != child) { 4277 return null; 4278 } 4279 4280 int pointerCount = 0; 4281 final int idCount = getIdCount(); 4282 for (int i = 0; i < idCount; i++) { 4283 if (targetAt(i) == child) { 4284 pointerCount++; 4285 } 4286 } 4287 4288 int actionId = -1; 4289 boolean needsNewIndex = false; // True if we should fill in the action's masked index 4290 4291 // If we have a down event, it wasn't counted above. 4292 if (maskedAction == MotionEvent.ACTION_DOWN) { 4293 pointerCount++; 4294 actionId = ev.getPointerId(0); 4295 } else if (maskedAction == MotionEvent.ACTION_POINTER_DOWN) { 4296 pointerCount++; 4297 4298 actionId = ev.getPointerId(ev.getActionIndex()); 4299 4300 if (indexOfTarget(child) < 0) { 4301 // The new action should be ACTION_DOWN if this child isn't currently getting 4302 // any events. 4303 action = MotionEvent.ACTION_DOWN; 4304 } else { 4305 // Fill in the index portion of the action later. 4306 needsNewIndex = true; 4307 } 4308 } else if (maskedAction == MotionEvent.ACTION_POINTER_UP) { 4309 actionId = ev.getPointerId(ev.getActionIndex()); 4310 if (pointerCount == 1) { 4311 // The new action should be ACTION_UP if there's only one pointer left for 4312 // this target. 4313 action = MotionEvent.ACTION_UP; 4314 } else { 4315 // Fill in the index portion of the action later. 4316 needsNewIndex = true; 4317 } 4318 } 4319 4320 if (pointerCount == 0) { 4321 return null; 4322 } 4323 4324 // Fill the buckets with pointer data! 4325 final int eventPointerCount = ev.getPointerCount(); 4326 int bucketIndex = 0; 4327 int newActionIndex = -1; 4328 for (int evp = 0; evp < eventPointerCount; evp++) { 4329 final int id = ev.getPointerId(evp); 4330 4331 // Add this pointer to the bucket if it is new or targeted at child 4332 if (id == actionId || get(id) == child) { 4333 // Expand scratch arrays if needed 4334 if (mPointerCoords.length <= bucketIndex) { 4335 int[] pointerIds = new int[pointerCount]; 4336 MotionEvent.PointerCoords[] pointerCoords = 4337 new MotionEvent.PointerCoords[pointerCount]; 4338 for (int i = mPointerCoords.length; i < pointerCoords.length; i++) { 4339 pointerCoords[i] = new MotionEvent.PointerCoords(); 4340 } 4341 4342 System.arraycopy(mPointerCoords, 0, 4343 pointerCoords, 0, mPointerCoords.length); 4344 System.arraycopy(mPointerIds, 0, pointerIds, 0, mPointerIds.length); 4345 4346 mPointerCoords = pointerCoords; 4347 mPointerIds = pointerIds; 4348 } 4349 4350 mPointerIds[bucketIndex] = id; 4351 ev.getPointerCoords(evp, mPointerCoords[bucketIndex]); 4352 4353 if (needsNewIndex && id == actionId) { 4354 newActionIndex = bucketIndex; 4355 } 4356 4357 bucketIndex++; 4358 } 4359 } 4360 4361 // Encode the new action index if we have one 4362 if (newActionIndex >= 0) { 4363 action = (action & MotionEvent.ACTION_MASK) | 4364 (newActionIndex << MotionEvent.ACTION_POINTER_INDEX_SHIFT); 4365 } 4366 4367 return MotionEvent.obtain(downTime, ev.getEventTime(), 4368 action, pointerCount, mPointerIds, mPointerCoords, ev.getMetaState(), 4369 ev.getXPrecision(), ev.getYPrecision(), ev.getDeviceId(), ev.getEdgeFlags(), 4370 ev.getSource()); 4371 } 4372 4373 static class TargetInfo { 4374 public View view; 4375 public long downTime; 4376 4377 private TargetInfo mNextRecycled; 4378 4379 private static TargetInfo sRecycleBin; 4380 private static int sRecycledCount; 4381 4382 private static int MAX_RECYCLED = 15; 4383 4384 private TargetInfo() { 4385 } 4386 4387 public static TargetInfo obtain(View v, long time) { 4388 TargetInfo info; 4389 if (sRecycleBin == null) { 4390 info = new TargetInfo(); 4391 } else { 4392 info = sRecycleBin; 4393 sRecycleBin = info.mNextRecycled; 4394 sRecycledCount--; 4395 } 4396 info.view = v; 4397 info.downTime = time; 4398 return info; 4399 } 4400 4401 public void recycle() { 4402 if (sRecycledCount >= MAX_RECYCLED) { 4403 return; 4404 } 4405 mNextRecycled = sRecycleBin; 4406 sRecycleBin = this; 4407 sRecycledCount++; 4408 } 4409 } 4410 } 4411} 4412