ViewGroup.java revision d6a463a9f23b3901bf729f2f27a6bb8f78b95248
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.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Paint; 26import android.graphics.Rect; 27import android.graphics.RectF; 28import android.graphics.Region; 29import android.os.Parcelable; 30import android.os.SystemClock; 31import android.util.AttributeSet; 32import android.util.Config; 33import android.util.EventLog; 34import android.util.Log; 35import android.util.SparseArray; 36import android.view.accessibility.AccessibilityEvent; 37import android.view.animation.Animation; 38import android.view.animation.AnimationUtils; 39import android.view.animation.LayoutAnimationController; 40import android.view.animation.Transformation; 41 42import java.util.ArrayList; 43 44/** 45 * <p> 46 * A <code>ViewGroup</code> is a special view that can contain other views 47 * (called children.) The view group is the base class for layouts and views 48 * containers. This class also defines the 49 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 50 * class for layouts parameters. 51 * </p> 52 * 53 * <p> 54 * Also see {@link LayoutParams} for layout attributes. 55 * </p> 56 * 57 * @attr ref android.R.styleable#ViewGroup_clipChildren 58 * @attr ref android.R.styleable#ViewGroup_clipToPadding 59 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 60 * @attr ref android.R.styleable#ViewGroup_animationCache 61 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 62 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 63 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 64 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 65 */ 66public abstract class ViewGroup extends View implements ViewParent, ViewManager { 67 private static final boolean DBG = false; 68 69 /** 70 * Views which have been hidden or removed which need to be animated on 71 * their way out. 72 * This field should be made private, so it is hidden from the SDK. 73 * {@hide} 74 */ 75 protected ArrayList<View> mDisappearingChildren; 76 77 /** 78 * Listener used to propagate events indicating when children are added 79 * and/or removed from a view group. 80 * This field should be made private, so it is hidden from the SDK. 81 * {@hide} 82 */ 83 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 84 85 // The view contained within this ViewGroup that has or contains focus. 86 private View mFocused; 87 88 // The current transformation to apply on the child being drawn 89 private Transformation mChildTransformation; 90 private RectF mInvalidateRegion; 91 92 // Target of Motion events 93 private View mMotionTarget; 94 private final Rect mTempRect = new Rect(); 95 96 // Layout animation 97 private LayoutAnimationController mLayoutAnimationController; 98 private Animation.AnimationListener mAnimationListener; 99 100 /** 101 * Internal flags. 102 * 103 * This field should be made private, so it is hidden from the SDK. 104 * {@hide} 105 */ 106 protected int mGroupFlags; 107 108 // When set, ViewGroup invalidates only the child's rectangle 109 // Set by default 110 private static final int FLAG_CLIP_CHILDREN = 0x1; 111 112 // When set, ViewGroup excludes the padding area from the invalidate rectangle 113 // Set by default 114 private static final int FLAG_CLIP_TO_PADDING = 0x2; 115 116 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 117 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 118 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 119 120 // When set, dispatchDraw() will run the layout animation and unset the flag 121 private static final int FLAG_RUN_ANIMATION = 0x8; 122 123 // When set, there is either no layout animation on the ViewGroup or the layout 124 // animation is over 125 // Set by default 126 private static final int FLAG_ANIMATION_DONE = 0x10; 127 128 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 129 // to clip it, even if FLAG_CLIP_TO_PADDING is set 130 private static final int FLAG_PADDING_NOT_NULL = 0x20; 131 132 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 133 // Set by default 134 private static final int FLAG_ANIMATION_CACHE = 0x40; 135 136 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 137 // layout animation; this avoid clobbering the hierarchy 138 // Automatically set when the layout animation starts, depending on the animation's 139 // characteristics 140 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 141 142 // When set, the next call to drawChild() will clear mChildTransformation's matrix 143 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 144 145 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 146 // the children's Bitmap caches if necessary 147 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 148 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 149 150 /** 151 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 152 * to get the index of the child to draw for that iteration. 153 */ 154 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 155 156 /** 157 * When set, this ViewGroup supports static transformations on children; this causes 158 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 159 * invoked when a child is drawn. 160 * 161 * Any subclass overriding 162 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 163 * set this flags in {@link #mGroupFlags}. 164 * 165 * {@hide} 166 */ 167 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 168 169 // When the previous drawChild() invocation used an alpha value that was lower than 170 // 1.0 and set it in mCachePaint 171 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 172 173 /** 174 * When set, this ViewGroup's drawable states also include those 175 * of its children. 176 */ 177 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 178 179 /** 180 * When set, this ViewGroup tries to always draw its children using their drawing cache. 181 */ 182 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 183 184 /** 185 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 186 * draw its children with their drawing cache. 187 */ 188 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 189 190 /** 191 * When set, this group will go through its list of children to notify them of 192 * any drawable state change. 193 */ 194 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 195 196 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 197 198 /** 199 * This view will get focus before any of its descendants. 200 */ 201 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 202 203 /** 204 * This view will get focus only if none of its descendants want it. 205 */ 206 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 207 208 /** 209 * This view will block any of its descendants from getting focus, even 210 * if they are focusable. 211 */ 212 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 213 214 /** 215 * Used to map between enum in attrubutes and flag values. 216 */ 217 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 218 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 219 FOCUS_BLOCK_DESCENDANTS}; 220 221 /** 222 * When set, this ViewGroup should not intercept touch events. 223 */ 224 private static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 225 226 /** 227 * Indicates which types of drawing caches are to be kept in memory. 228 * This field should be made private, so it is hidden from the SDK. 229 * {@hide} 230 */ 231 protected int mPersistentDrawingCache; 232 233 /** 234 * Used to indicate that no drawing cache should be kept in memory. 235 */ 236 public static final int PERSISTENT_NO_CACHE = 0x0; 237 238 /** 239 * Used to indicate that the animation drawing cache should be kept in memory. 240 */ 241 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 242 243 /** 244 * Used to indicate that the scrolling drawing cache should be kept in memory. 245 */ 246 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 247 248 /** 249 * Used to indicate that all drawing caches should be kept in memory. 250 */ 251 public static final int PERSISTENT_ALL_CACHES = 0x3; 252 253 /** 254 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 255 * are set at the same time. 256 */ 257 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 258 259 // Index of the child's left position in the mLocation array 260 private static final int CHILD_LEFT_INDEX = 0; 261 // Index of the child's top position in the mLocation array 262 private static final int CHILD_TOP_INDEX = 1; 263 264 // Child views of this ViewGroup 265 private View[] mChildren; 266 // Number of valid children in the mChildren array, the rest should be null or not 267 // considered as children 268 private int mChildrenCount; 269 270 private static final int ARRAY_INITIAL_CAPACITY = 12; 271 private static final int ARRAY_CAPACITY_INCREMENT = 12; 272 273 // Used to draw cached views 274 private final Paint mCachePaint = new Paint(); 275 276 public ViewGroup(Context context) { 277 super(context); 278 initViewGroup(); 279 } 280 281 public ViewGroup(Context context, AttributeSet attrs) { 282 super(context, attrs); 283 initViewGroup(); 284 initFromAttributes(context, attrs); 285 } 286 287 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 288 super(context, attrs, defStyle); 289 initViewGroup(); 290 initFromAttributes(context, attrs); 291 } 292 293 private void initViewGroup() { 294 // ViewGroup doesn't draw by default 295 setFlags(WILL_NOT_DRAW, DRAW_MASK); 296 mGroupFlags |= FLAG_CLIP_CHILDREN; 297 mGroupFlags |= FLAG_CLIP_TO_PADDING; 298 mGroupFlags |= FLAG_ANIMATION_DONE; 299 mGroupFlags |= FLAG_ANIMATION_CACHE; 300 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 301 302 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 303 304 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 305 mChildrenCount = 0; 306 307 mCachePaint.setDither(false); 308 309 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 310 } 311 312 private void initFromAttributes(Context context, AttributeSet attrs) { 313 TypedArray a = context.obtainStyledAttributes(attrs, 314 R.styleable.ViewGroup); 315 316 final int N = a.getIndexCount(); 317 for (int i = 0; i < N; i++) { 318 int attr = a.getIndex(i); 319 switch (attr) { 320 case R.styleable.ViewGroup_clipChildren: 321 setClipChildren(a.getBoolean(attr, true)); 322 break; 323 case R.styleable.ViewGroup_clipToPadding: 324 setClipToPadding(a.getBoolean(attr, true)); 325 break; 326 case R.styleable.ViewGroup_animationCache: 327 setAnimationCacheEnabled(a.getBoolean(attr, true)); 328 break; 329 case R.styleable.ViewGroup_persistentDrawingCache: 330 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 331 break; 332 case R.styleable.ViewGroup_addStatesFromChildren: 333 setAddStatesFromChildren(a.getBoolean(attr, false)); 334 break; 335 case R.styleable.ViewGroup_alwaysDrawnWithCache: 336 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 337 break; 338 case R.styleable.ViewGroup_layoutAnimation: 339 int id = a.getResourceId(attr, -1); 340 if (id > 0) { 341 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 342 } 343 break; 344 case R.styleable.ViewGroup_descendantFocusability: 345 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 346 break; 347 } 348 } 349 350 a.recycle(); 351 } 352 353 /** 354 * Gets the descendant focusability of this view group. The descendant 355 * focusability defines the relationship between this view group and its 356 * descendants when looking for a view to take focus in 357 * {@link #requestFocus(int, android.graphics.Rect)}. 358 * 359 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 360 * {@link #FOCUS_BLOCK_DESCENDANTS}. 361 */ 362 @ViewDebug.ExportedProperty(mapping = { 363 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 364 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 365 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 366 }) 367 public int getDescendantFocusability() { 368 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 369 } 370 371 /** 372 * Set the descendant focusability of this view group. This defines the relationship 373 * between this view group and its descendants when looking for a view to 374 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 375 * 376 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 377 * {@link #FOCUS_BLOCK_DESCENDANTS}. 378 */ 379 public void setDescendantFocusability(int focusability) { 380 switch (focusability) { 381 case FOCUS_BEFORE_DESCENDANTS: 382 case FOCUS_AFTER_DESCENDANTS: 383 case FOCUS_BLOCK_DESCENDANTS: 384 break; 385 default: 386 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 387 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 388 } 389 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 390 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 391 } 392 393 /** 394 * {@inheritDoc} 395 */ 396 @Override 397 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 398 if (mFocused != null) { 399 mFocused.unFocus(); 400 mFocused = null; 401 } 402 super.handleFocusGainInternal(direction, previouslyFocusedRect); 403 } 404 405 /** 406 * {@inheritDoc} 407 */ 408 public void requestChildFocus(View child, View focused) { 409 if (DBG) { 410 System.out.println(this + " requestChildFocus()"); 411 } 412 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 413 return; 414 } 415 416 // Unfocus us, if necessary 417 super.unFocus(); 418 419 // We had a previous notion of who had focus. Clear it. 420 if (mFocused != child) { 421 if (mFocused != null) { 422 mFocused.unFocus(); 423 } 424 425 mFocused = child; 426 } 427 if (mParent != null) { 428 mParent.requestChildFocus(this, focused); 429 } 430 } 431 432 /** 433 * {@inheritDoc} 434 */ 435 public void focusableViewAvailable(View v) { 436 if (mParent != null 437 // shortcut: don't report a new focusable view if we block our descendants from 438 // getting focus 439 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 440 // shortcut: don't report a new focusable view if we already are focused 441 // (and we don't prefer our descendants) 442 // 443 // note: knowing that mFocused is non-null is not a good enough reason 444 // to break the traversal since in that case we'd actually have to find 445 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 446 // an ancestor of v; this will get checked for at ViewRoot 447 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 448 mParent.focusableViewAvailable(v); 449 } 450 } 451 452 /** 453 * {@inheritDoc} 454 */ 455 public boolean showContextMenuForChild(View originalView) { 456 return mParent != null && mParent.showContextMenuForChild(originalView); 457 } 458 459 /** 460 * Find the nearest view in the specified direction that wants to take 461 * focus. 462 * 463 * @param focused The view that currently has focus 464 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 465 * FOCUS_RIGHT, or 0 for not applicable. 466 */ 467 public View focusSearch(View focused, int direction) { 468 if (isRootNamespace()) { 469 // root namespace means we should consider ourselves the top of the 470 // tree for focus searching; otherwise we could be focus searching 471 // into other tabs. see LocalActivityManager and TabHost for more info 472 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 473 } else if (mParent != null) { 474 return mParent.focusSearch(focused, direction); 475 } 476 return null; 477 } 478 479 /** 480 * {@inheritDoc} 481 */ 482 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 483 return false; 484 } 485 486 /** 487 * {@inheritDoc} 488 */ 489 @Override 490 public boolean dispatchUnhandledMove(View focused, int direction) { 491 return mFocused != null && 492 mFocused.dispatchUnhandledMove(focused, direction); 493 } 494 495 /** 496 * {@inheritDoc} 497 */ 498 public void clearChildFocus(View child) { 499 if (DBG) { 500 System.out.println(this + " clearChildFocus()"); 501 } 502 503 mFocused = null; 504 if (mParent != null) { 505 mParent.clearChildFocus(this); 506 } 507 } 508 509 /** 510 * {@inheritDoc} 511 */ 512 @Override 513 public void clearFocus() { 514 super.clearFocus(); 515 516 // clear any child focus if it exists 517 if (mFocused != null) { 518 mFocused.clearFocus(); 519 } 520 } 521 522 /** 523 * {@inheritDoc} 524 */ 525 @Override 526 void unFocus() { 527 if (DBG) { 528 System.out.println(this + " unFocus()"); 529 } 530 531 super.unFocus(); 532 if (mFocused != null) { 533 mFocused.unFocus(); 534 } 535 mFocused = null; 536 } 537 538 /** 539 * Returns the focused child of this view, if any. The child may have focus 540 * or contain focus. 541 * 542 * @return the focused child or null. 543 */ 544 public View getFocusedChild() { 545 return mFocused; 546 } 547 548 /** 549 * Returns true if this view has or contains focus 550 * 551 * @return true if this view has or contains focus 552 */ 553 @Override 554 public boolean hasFocus() { 555 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 556 } 557 558 /* 559 * (non-Javadoc) 560 * 561 * @see android.view.View#findFocus() 562 */ 563 @Override 564 public View findFocus() { 565 if (DBG) { 566 System.out.println("Find focus in " + this + ": flags=" 567 + isFocused() + ", child=" + mFocused); 568 } 569 570 if (isFocused()) { 571 return this; 572 } 573 574 if (mFocused != null) { 575 return mFocused.findFocus(); 576 } 577 return null; 578 } 579 580 /** 581 * {@inheritDoc} 582 */ 583 @Override 584 public boolean hasFocusable() { 585 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 586 return false; 587 } 588 589 if (isFocusable()) { 590 return true; 591 } 592 593 final int descendantFocusability = getDescendantFocusability(); 594 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 595 final int count = mChildrenCount; 596 final View[] children = mChildren; 597 598 for (int i = 0; i < count; i++) { 599 final View child = children[i]; 600 if (child.hasFocusable()) { 601 return true; 602 } 603 } 604 } 605 606 return false; 607 } 608 609 /** 610 * {@inheritDoc} 611 */ 612 @Override 613 public void addFocusables(ArrayList<View> views, int direction) { 614 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 615 } 616 617 /** 618 * {@inheritDoc} 619 */ 620 @Override 621 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 622 final int focusableCount = views.size(); 623 624 final int descendantFocusability = getDescendantFocusability(); 625 626 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 627 final int count = mChildrenCount; 628 final View[] children = mChildren; 629 630 for (int i = 0; i < count; i++) { 631 final View child = children[i]; 632 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 633 child.addFocusables(views, direction, focusableMode); 634 } 635 } 636 } 637 638 // we add ourselves (if focusable) in all cases except for when we are 639 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 640 // to avoid the focus search finding layouts when a more precise search 641 // among the focusable children would be more interesting. 642 if ( 643 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 644 // No focusable descendants 645 (focusableCount == views.size())) { 646 super.addFocusables(views, direction, focusableMode); 647 } 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 @Override 654 public void dispatchWindowFocusChanged(boolean hasFocus) { 655 super.dispatchWindowFocusChanged(hasFocus); 656 final int count = mChildrenCount; 657 final View[] children = mChildren; 658 for (int i = 0; i < count; i++) { 659 children[i].dispatchWindowFocusChanged(hasFocus); 660 } 661 } 662 663 /** 664 * {@inheritDoc} 665 */ 666 @Override 667 public void addTouchables(ArrayList<View> views) { 668 super.addTouchables(views); 669 670 final int count = mChildrenCount; 671 final View[] children = mChildren; 672 673 for (int i = 0; i < count; i++) { 674 final View child = children[i]; 675 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 676 child.addTouchables(views); 677 } 678 } 679 } 680 681 /** 682 * {@inheritDoc} 683 */ 684 @Override 685 public void dispatchWindowVisibilityChanged(int visibility) { 686 super.dispatchWindowVisibilityChanged(visibility); 687 final int count = mChildrenCount; 688 final View[] children = mChildren; 689 for (int i = 0; i < count; i++) { 690 children[i].dispatchWindowVisibilityChanged(visibility); 691 } 692 } 693 694 /** 695 * {@inheritDoc} 696 */ 697 public void recomputeViewAttributes(View child) { 698 ViewParent parent = mParent; 699 if (parent != null) parent.recomputeViewAttributes(this); 700 } 701 702 @Override 703 void dispatchCollectViewAttributes(int visibility) { 704 visibility |= mViewFlags&VISIBILITY_MASK; 705 super.dispatchCollectViewAttributes(visibility); 706 final int count = mChildrenCount; 707 final View[] children = mChildren; 708 for (int i = 0; i < count; i++) { 709 children[i].dispatchCollectViewAttributes(visibility); 710 } 711 } 712 713 /** 714 * {@inheritDoc} 715 */ 716 public void bringChildToFront(View child) { 717 int index = indexOfChild(child); 718 if (index >= 0) { 719 removeFromArray(index); 720 addInArray(child, mChildrenCount); 721 child.mParent = this; 722 } 723 } 724 725 /** 726 * {@inheritDoc} 727 */ 728 @Override 729 public boolean dispatchKeyEventPreIme(KeyEvent event) { 730 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 731 return super.dispatchKeyEventPreIme(event); 732 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 733 return mFocused.dispatchKeyEventPreIme(event); 734 } 735 return false; 736 } 737 738 /** 739 * {@inheritDoc} 740 */ 741 @Override 742 public boolean dispatchKeyEvent(KeyEvent event) { 743 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 744 return super.dispatchKeyEvent(event); 745 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 746 return mFocused.dispatchKeyEvent(event); 747 } 748 return false; 749 } 750 751 /** 752 * {@inheritDoc} 753 */ 754 @Override 755 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 756 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 757 return super.dispatchKeyShortcutEvent(event); 758 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 759 return mFocused.dispatchKeyShortcutEvent(event); 760 } 761 return false; 762 } 763 764 /** 765 * {@inheritDoc} 766 */ 767 @Override 768 public boolean dispatchTrackballEvent(MotionEvent event) { 769 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 770 return super.dispatchTrackballEvent(event); 771 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 772 return mFocused.dispatchTrackballEvent(event); 773 } 774 return false; 775 } 776 777 /** 778 * {@inheritDoc} 779 */ 780 @Override 781 public boolean dispatchTouchEvent(MotionEvent ev) { 782 final int action = ev.getAction(); 783 final float xf = ev.getX(); 784 final float yf = ev.getY(); 785 final float scrolledXFloat = xf + mScrollX; 786 final float scrolledYFloat = yf + mScrollY; 787 final Rect frame = mTempRect; 788 789 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 790 791 if (action == MotionEvent.ACTION_DOWN) { 792 if (mMotionTarget != null) { 793 // this is weird, we got a pen down, but we thought it was 794 // already down! 795 // XXX: We should probably send an ACTION_UP to the current 796 // target. 797 mMotionTarget = null; 798 } 799 // If we're disallowing intercept or if we're allowing and we didn't 800 // intercept 801 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 802 // reset this event's action (just to protect ourselves) 803 ev.setAction(MotionEvent.ACTION_DOWN); 804 // We know we want to dispatch the event down, find a child 805 // who can handle it, start with the front-most child. 806 final int scrolledXInt = (int) scrolledXFloat; 807 final int scrolledYInt = (int) scrolledYFloat; 808 final View[] children = mChildren; 809 final int count = mChildrenCount; 810 for (int i = count - 1; i >= 0; i--) { 811 final View child = children[i]; 812 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 813 || child.getAnimation() != null) { 814 child.getHitRect(frame); 815 if (frame.contains(scrolledXInt, scrolledYInt)) { 816 // offset the event to the view's coordinate system 817 final float xc = scrolledXFloat - child.mLeft; 818 final float yc = scrolledYFloat - child.mTop; 819 ev.setLocation(xc, yc); 820 if (child.dispatchTouchEvent(ev)) { 821 // Event handled, we have a target now. 822 mMotionTarget = child; 823 return true; 824 } 825 // The event didn't get handled, try the next view. 826 // Don't reset the event's location, it's not 827 // necessary here. 828 } 829 } 830 } 831 } 832 } 833 834 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 835 (action == MotionEvent.ACTION_CANCEL); 836 837 if (isUpOrCancel) { 838 // Note, we've already copied the previous state to our local 839 // variable, so this takes effect on the next event 840 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 841 } 842 843 // The event wasn't an ACTION_DOWN, dispatch it to our target if 844 // we have one. 845 final View target = mMotionTarget; 846 if (target == null) { 847 // We don't have a target, this means we're handling the 848 // event as a regular view. 849 ev.setLocation(xf, yf); 850 return super.dispatchTouchEvent(ev); 851 } 852 853 // if have a target, see if we're allowed to and want to intercept its 854 // events 855 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 856 final float xc = scrolledXFloat - (float) target.mLeft; 857 final float yc = scrolledYFloat - (float) target.mTop; 858 ev.setAction(MotionEvent.ACTION_CANCEL); 859 ev.setLocation(xc, yc); 860 if (!target.dispatchTouchEvent(ev)) { 861 // target didn't handle ACTION_CANCEL. not much we can do 862 // but they should have. 863 } 864 // clear the target 865 mMotionTarget = null; 866 // Don't dispatch this event to our own view, because we already 867 // saw it when intercepting; we just want to give the following 868 // event to the normal onTouchEvent(). 869 return true; 870 } 871 872 if (isUpOrCancel) { 873 mMotionTarget = null; 874 } 875 876 // finally offset the event to the target's coordinate system and 877 // dispatch the event. 878 final float xc = scrolledXFloat - (float) target.mLeft; 879 final float yc = scrolledYFloat - (float) target.mTop; 880 ev.setLocation(xc, yc); 881 882 return target.dispatchTouchEvent(ev); 883 } 884 885 /** 886 * {@inheritDoc} 887 */ 888 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 889 890 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 891 // We're already in this state, assume our ancestors are too 892 return; 893 } 894 895 if (disallowIntercept) { 896 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 897 } else { 898 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 899 } 900 901 // Pass it up to our parent 902 if (mParent != null) { 903 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 904 } 905 } 906 907 /** 908 * Implement this method to intercept all touch screen motion events. This 909 * allows you to watch events as they are dispatched to your children, and 910 * take ownership of the current gesture at any point. 911 * 912 * <p>Using this function takes some care, as it has a fairly complicated 913 * interaction with {@link View#onTouchEvent(MotionEvent) 914 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 915 * that method as well as this one in the correct way. Events will be 916 * received in the following order: 917 * 918 * <ol> 919 * <li> You will receive the down event here. 920 * <li> The down event will be handled either by a child of this view 921 * group, or given to your own onTouchEvent() method to handle; this means 922 * you should implement onTouchEvent() to return true, so you will 923 * continue to see the rest of the gesture (instead of looking for 924 * a parent view to handle it). Also, by returning true from 925 * onTouchEvent(), you will not receive any following 926 * events in onInterceptTouchEvent() and all touch processing must 927 * happen in onTouchEvent() like normal. 928 * <li> For as long as you return false from this function, each following 929 * event (up to and including the final up) will be delivered first here 930 * and then to the target's onTouchEvent(). 931 * <li> If you return true from here, you will not receive any 932 * following events: the target view will receive the same event but 933 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 934 * events will be delivered to your onTouchEvent() method and no longer 935 * appear here. 936 * </ol> 937 * 938 * @param ev The motion event being dispatched down the hierarchy. 939 * @return Return true to steal motion events from the children and have 940 * them dispatched to this ViewGroup through onTouchEvent(). 941 * The current target will receive an ACTION_CANCEL event, and no further 942 * messages will be delivered here. 943 */ 944 public boolean onInterceptTouchEvent(MotionEvent ev) { 945 return false; 946 } 947 948 /** 949 * {@inheritDoc} 950 * 951 * Looks for a view to give focus to respecting the setting specified by 952 * {@link #getDescendantFocusability()}. 953 * 954 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 955 * find focus within the children of this group when appropriate. 956 * 957 * @see #FOCUS_BEFORE_DESCENDANTS 958 * @see #FOCUS_AFTER_DESCENDANTS 959 * @see #FOCUS_BLOCK_DESCENDANTS 960 * @see #onRequestFocusInDescendants 961 */ 962 @Override 963 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 964 if (DBG) { 965 System.out.println(this + " ViewGroup.requestFocus direction=" 966 + direction); 967 } 968 int descendantFocusability = getDescendantFocusability(); 969 970 switch (descendantFocusability) { 971 case FOCUS_BLOCK_DESCENDANTS: 972 return super.requestFocus(direction, previouslyFocusedRect); 973 case FOCUS_BEFORE_DESCENDANTS: { 974 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 975 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 976 } 977 case FOCUS_AFTER_DESCENDANTS: { 978 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 979 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 980 } 981 default: 982 throw new IllegalStateException("descendant focusability must be " 983 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 984 + "but is " + descendantFocusability); 985 } 986 } 987 988 /** 989 * Look for a descendant to call {@link View#requestFocus} on. 990 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 991 * when it wants to request focus within its children. Override this to 992 * customize how your {@link ViewGroup} requests focus within its children. 993 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 994 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 995 * to give a finer grained hint about where focus is coming from. May be null 996 * if there is no hint. 997 * @return Whether focus was taken. 998 */ 999 @SuppressWarnings({"ConstantConditions"}) 1000 protected boolean onRequestFocusInDescendants(int direction, 1001 Rect previouslyFocusedRect) { 1002 int index; 1003 int increment; 1004 int end; 1005 int count = mChildrenCount; 1006 if ((direction & FOCUS_FORWARD) != 0) { 1007 index = 0; 1008 increment = 1; 1009 end = count; 1010 } else { 1011 index = count - 1; 1012 increment = -1; 1013 end = -1; 1014 } 1015 final View[] children = mChildren; 1016 for (int i = index; i != end; i += increment) { 1017 View child = children[i]; 1018 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1019 if (child.requestFocus(direction, previouslyFocusedRect)) { 1020 return true; 1021 } 1022 } 1023 } 1024 return false; 1025 } 1026 1027 /** 1028 * {@inheritDoc} 1029 */ 1030 @Override 1031 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1032 super.dispatchAttachedToWindow(info, visibility); 1033 visibility |= mViewFlags & VISIBILITY_MASK; 1034 final int count = mChildrenCount; 1035 final View[] children = mChildren; 1036 for (int i = 0; i < count; i++) { 1037 children[i].dispatchAttachedToWindow(info, visibility); 1038 } 1039 } 1040 1041 @Override 1042 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 1043 boolean populated = false; 1044 for (int i = 0, count = getChildCount(); i < count; i++) { 1045 populated |= getChildAt(i).dispatchPopulateAccessibilityEvent(event); 1046 } 1047 return populated; 1048 } 1049 1050 /** 1051 * {@inheritDoc} 1052 */ 1053 @Override 1054 void dispatchDetachedFromWindow() { 1055 // If we still have a motion target, we are still in the process of 1056 // dispatching motion events to a child; we need to get rid of that 1057 // child to avoid dispatching events to it after the window is torn 1058 // down. To make sure we keep the child in a consistent state, we 1059 // first send it an ACTION_CANCEL motion event. 1060 if (mMotionTarget != null) { 1061 final long now = SystemClock.uptimeMillis(); 1062 final MotionEvent event = MotionEvent.obtain(now, now, 1063 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1064 mMotionTarget.dispatchTouchEvent(event); 1065 event.recycle(); 1066 mMotionTarget = null; 1067 } 1068 1069 final int count = mChildrenCount; 1070 final View[] children = mChildren; 1071 for (int i = 0; i < count; i++) { 1072 children[i].dispatchDetachedFromWindow(); 1073 } 1074 super.dispatchDetachedFromWindow(); 1075 } 1076 1077 /** 1078 * {@inheritDoc} 1079 */ 1080 @Override 1081 public void setPadding(int left, int top, int right, int bottom) { 1082 super.setPadding(left, top, right, bottom); 1083 1084 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1085 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1086 } else { 1087 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1088 } 1089 } 1090 1091 /** 1092 * {@inheritDoc} 1093 */ 1094 @Override 1095 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1096 super.dispatchSaveInstanceState(container); 1097 final int count = mChildrenCount; 1098 final View[] children = mChildren; 1099 for (int i = 0; i < count; i++) { 1100 children[i].dispatchSaveInstanceState(container); 1101 } 1102 } 1103 1104 /** 1105 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1106 * not to its children. For use when overriding 1107 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1108 * their own state but not the state of their children. 1109 * 1110 * @param container the container 1111 */ 1112 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1113 super.dispatchSaveInstanceState(container); 1114 } 1115 1116 /** 1117 * {@inheritDoc} 1118 */ 1119 @Override 1120 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1121 super.dispatchRestoreInstanceState(container); 1122 final int count = mChildrenCount; 1123 final View[] children = mChildren; 1124 for (int i = 0; i < count; i++) { 1125 children[i].dispatchRestoreInstanceState(container); 1126 } 1127 } 1128 1129 /** 1130 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1131 * not to its children. For use when overriding 1132 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1133 * their own state but not the state of their children. 1134 * 1135 * @param container the container 1136 */ 1137 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1138 super.dispatchRestoreInstanceState(container); 1139 } 1140 1141 /** 1142 * Enables or disables the drawing cache for each child of this view group. 1143 * 1144 * @param enabled true to enable the cache, false to dispose of it 1145 */ 1146 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1147 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1148 final View[] children = mChildren; 1149 final int count = mChildrenCount; 1150 for (int i = 0; i < count; i++) { 1151 children[i].setDrawingCacheEnabled(enabled); 1152 } 1153 } 1154 } 1155 1156 @Override 1157 protected void onAnimationStart() { 1158 super.onAnimationStart(); 1159 1160 // When this ViewGroup's animation starts, build the cache for the children 1161 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1162 final int count = mChildrenCount; 1163 final View[] children = mChildren; 1164 1165 for (int i = 0; i < count; i++) { 1166 final View child = children[i]; 1167 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1168 child.setDrawingCacheEnabled(true); 1169 child.buildDrawingCache(); 1170 } 1171 } 1172 1173 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1174 } 1175 } 1176 1177 @Override 1178 protected void onAnimationEnd() { 1179 super.onAnimationEnd(); 1180 1181 // When this ViewGroup's animation ends, destroy the cache of the children 1182 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1183 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1184 1185 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1186 setChildrenDrawingCacheEnabled(false); 1187 } 1188 } 1189 } 1190 1191 /** 1192 * {@inheritDoc} 1193 */ 1194 @Override 1195 protected void dispatchDraw(Canvas canvas) { 1196 final int count = mChildrenCount; 1197 final View[] children = mChildren; 1198 int flags = mGroupFlags; 1199 1200 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1201 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1202 1203 for (int i = 0; i < count; i++) { 1204 final View child = children[i]; 1205 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1206 final LayoutParams params = child.getLayoutParams(); 1207 attachLayoutAnimationParameters(child, params, i, count); 1208 bindLayoutAnimation(child); 1209 if (cache) { 1210 child.setDrawingCacheEnabled(true); 1211 child.buildDrawingCache(); 1212 } 1213 } 1214 } 1215 1216 final LayoutAnimationController controller = mLayoutAnimationController; 1217 if (controller.willOverlap()) { 1218 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1219 } 1220 1221 controller.start(); 1222 1223 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1224 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1225 1226 if (cache) { 1227 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1228 } 1229 1230 if (mAnimationListener != null) { 1231 mAnimationListener.onAnimationStart(controller.getAnimation()); 1232 } 1233 } 1234 1235 int saveCount = 0; 1236 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1237 if (clipToPadding) { 1238 saveCount = canvas.save(); 1239 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1240 mScrollX + mRight - mLeft - mPaddingRight, 1241 mScrollY + mBottom - mTop - mPaddingBottom); 1242 1243 } 1244 1245 // We will draw our child's animation, let's reset the flag 1246 mPrivateFlags &= ~DRAW_ANIMATION; 1247 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1248 1249 boolean more = false; 1250 final long drawingTime = getDrawingTime(); 1251 1252 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1253 for (int i = 0; i < count; i++) { 1254 final View child = children[i]; 1255 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1256 more |= drawChild(canvas, child, drawingTime); 1257 } 1258 } 1259 } else { 1260 for (int i = 0; i < count; i++) { 1261 final View child = children[getChildDrawingOrder(count, i)]; 1262 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1263 more |= drawChild(canvas, child, drawingTime); 1264 } 1265 } 1266 } 1267 1268 // Draw any disappearing views that have animations 1269 if (mDisappearingChildren != null) { 1270 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1271 final int disappearingCount = disappearingChildren.size() - 1; 1272 // Go backwards -- we may delete as animations finish 1273 for (int i = disappearingCount; i >= 0; i--) { 1274 final View child = disappearingChildren.get(i); 1275 more |= drawChild(canvas, child, drawingTime); 1276 } 1277 } 1278 1279 if (clipToPadding) { 1280 canvas.restoreToCount(saveCount); 1281 } 1282 1283 // mGroupFlags might have been updated by drawChild() 1284 flags = mGroupFlags; 1285 1286 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1287 invalidate(); 1288 } 1289 1290 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1291 mLayoutAnimationController.isDone() && !more) { 1292 // We want to erase the drawing cache and notify the listener after the 1293 // next frame is drawn because one extra invalidate() is caused by 1294 // drawChild() after the animation is over 1295 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1296 final Runnable end = new Runnable() { 1297 public void run() { 1298 notifyAnimationListener(); 1299 } 1300 }; 1301 post(end); 1302 } 1303 } 1304 1305 /** 1306 * Returns the index of the child to draw for this iteration. Override this 1307 * if you want to change the drawing order of children. By default, it 1308 * returns i. 1309 * <p> 1310 * NOTE: In order for this method to be called, the 1311 * {@link #FLAG_USE_CHILD_DRAWING_ORDER} must be set. 1312 * 1313 * @param i The current iteration. 1314 * @return The index of the child to draw this iteration. 1315 */ 1316 protected int getChildDrawingOrder(int childCount, int i) { 1317 return i; 1318 } 1319 1320 private void notifyAnimationListener() { 1321 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1322 mGroupFlags |= FLAG_ANIMATION_DONE; 1323 1324 if (mAnimationListener != null) { 1325 final Runnable end = new Runnable() { 1326 public void run() { 1327 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1328 } 1329 }; 1330 post(end); 1331 } 1332 1333 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1334 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1335 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1336 setChildrenDrawingCacheEnabled(false); 1337 } 1338 } 1339 1340 invalidate(); 1341 } 1342 1343 /** 1344 * Draw one child of this View Group. This method is responsible for getting 1345 * the canvas in the right state. This includes clipping, translating so 1346 * that the child's scrolled origin is at 0, 0, and applying any animation 1347 * transformations. 1348 * 1349 * @param canvas The canvas on which to draw the child 1350 * @param child Who to draw 1351 * @param drawingTime The time at which draw is occuring 1352 * @return True if an invalidate() was issued 1353 */ 1354 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1355 boolean more = false; 1356 1357 final int cl = child.mLeft; 1358 final int ct = child.mTop; 1359 final int cr = child.mRight; 1360 final int cb = child.mBottom; 1361 1362 final int flags = mGroupFlags; 1363 1364 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1365 if (mChildTransformation != null) { 1366 mChildTransformation.clear(); 1367 } 1368 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1369 } 1370 1371 Transformation transformToApply = null; 1372 final Animation a = child.getAnimation(); 1373 boolean concatMatrix = false; 1374 1375 if (a != null) { 1376 if (mInvalidateRegion == null) { 1377 mInvalidateRegion = new RectF(); 1378 } 1379 final RectF region = mInvalidateRegion; 1380 1381 final boolean initialized = a.isInitialized(); 1382 if (!initialized) { 1383 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1384 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1385 child.onAnimationStart(); 1386 } 1387 1388 if (mChildTransformation == null) { 1389 mChildTransformation = new Transformation(); 1390 } 1391 more = a.getTransformation(drawingTime, mChildTransformation); 1392 transformToApply = mChildTransformation; 1393 1394 concatMatrix = a.willChangeTransformationMatrix(); 1395 1396 if (more) { 1397 if (!a.willChangeBounds()) { 1398 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1399 FLAG_OPTIMIZE_INVALIDATE) { 1400 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1401 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1402 // The child need to draw an animation, potentially offscreen, so 1403 // make sure we do not cancel invalidate requests 1404 mPrivateFlags |= DRAW_ANIMATION; 1405 invalidate(cl, ct, cr, cb); 1406 } 1407 } else { 1408 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, transformToApply); 1409 1410 // The child need to draw an animation, potentially offscreen, so 1411 // make sure we do not cancel invalidate requests 1412 mPrivateFlags |= DRAW_ANIMATION; 1413 1414 final int left = cl + (int) region.left; 1415 final int top = ct + (int) region.top; 1416 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1417 } 1418 } 1419 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1420 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1421 if (mChildTransformation == null) { 1422 mChildTransformation = new Transformation(); 1423 } 1424 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1425 if (hasTransform) { 1426 final int transformType = mChildTransformation.getTransformationType(); 1427 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1428 mChildTransformation : null; 1429 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1430 } 1431 } 1432 1433 // Sets the flag as early as possible to allow draw() implementations 1434 // to call invalidate() successfully when doing animations 1435 child.mPrivateFlags |= DRAWN; 1436 1437 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1438 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1439 return more; 1440 } 1441 1442 child.computeScroll(); 1443 1444 final int sx = child.mScrollX; 1445 final int sy = child.mScrollY; 1446 1447 Bitmap cache = null; 1448 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1449 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1450 cache = child.getDrawingCache(); 1451 } 1452 1453 final boolean hasNoCache = cache == null; 1454 1455 final int restoreTo = canvas.save(); 1456 if (hasNoCache) { 1457 canvas.translate(cl - sx, ct - sy); 1458 } else { 1459 canvas.translate(cl, ct); 1460 } 1461 1462 float alpha = 1.0f; 1463 1464 if (transformToApply != null) { 1465 if (concatMatrix) { 1466 int transX = 0; 1467 int transY = 0; 1468 if (hasNoCache) { 1469 transX = -sx; 1470 transY = -sy; 1471 } 1472 // Undo the scroll translation, apply the transformation matrix, 1473 // then redo the scroll translate to get the correct result. 1474 canvas.translate(-transX, -transY); 1475 canvas.concat(transformToApply.getMatrix()); 1476 canvas.translate(transX, transY); 1477 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1478 } 1479 1480 alpha = transformToApply.getAlpha(); 1481 if (alpha < 1.0f) { 1482 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1483 } 1484 1485 if (alpha < 1.0f && hasNoCache) { 1486 final int multipliedAlpha = (int) (255 * alpha); 1487 if (!child.onSetAlpha(multipliedAlpha)) { 1488 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1489 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1490 } else { 1491 child.mPrivateFlags |= ALPHA_SET; 1492 } 1493 } 1494 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1495 child.onSetAlpha(255); 1496 } 1497 1498 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1499 if (hasNoCache) { 1500 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1501 } else { 1502 canvas.clipRect(0, 0, cr - cl, cb - ct); 1503 } 1504 } 1505 1506 if (hasNoCache) { 1507 // Fast path for layouts with no backgrounds 1508 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 1509 if (ViewDebug.TRACE_HIERARCHY) { 1510 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 1511 } 1512 child.mPrivateFlags &= ~DIRTY_MASK; 1513 child.dispatchDraw(canvas); 1514 } else { 1515 child.draw(canvas); 1516 } 1517 } else { 1518 final Paint cachePaint = mCachePaint; 1519 if (alpha < 1.0f) { 1520 cachePaint.setAlpha((int) (alpha * 255)); 1521 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 1522 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 1523 cachePaint.setAlpha(255); 1524 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 1525 } 1526 if (Config.DEBUG && ViewDebug.profileDrawing) { 1527 EventLog.writeEvent(60003, hashCode()); 1528 } 1529 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 1530 } 1531 1532 canvas.restoreToCount(restoreTo); 1533 1534 if (a != null && !more) { 1535 child.onSetAlpha(255); 1536 finishAnimatingView(child, a); 1537 } 1538 1539 return more; 1540 } 1541 1542 /** 1543 * By default, children are clipped to their bounds before drawing. This 1544 * allows view groups to override this behavior for animations, etc. 1545 * 1546 * @param clipChildren true to clip children to their bounds, 1547 * false otherwise 1548 * @attr ref android.R.styleable#ViewGroup_clipChildren 1549 */ 1550 public void setClipChildren(boolean clipChildren) { 1551 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 1552 } 1553 1554 /** 1555 * By default, children are clipped to the padding of the ViewGroup. This 1556 * allows view groups to override this behavior 1557 * 1558 * @param clipToPadding true to clip children to the padding of the 1559 * group, false otherwise 1560 * @attr ref android.R.styleable#ViewGroup_clipToPadding 1561 */ 1562 public void setClipToPadding(boolean clipToPadding) { 1563 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 1564 } 1565 1566 /** 1567 * {@inheritDoc} 1568 */ 1569 @Override 1570 public void dispatchSetSelected(boolean selected) { 1571 final View[] children = mChildren; 1572 final int count = mChildrenCount; 1573 for (int i = 0; i < count; i++) { 1574 children[i].setSelected(selected); 1575 } 1576 } 1577 1578 @Override 1579 protected void dispatchSetPressed(boolean pressed) { 1580 final View[] children = mChildren; 1581 final int count = mChildrenCount; 1582 for (int i = 0; i < count; i++) { 1583 children[i].setPressed(pressed); 1584 } 1585 } 1586 1587 /** 1588 * When this property is set to true, this ViewGroup supports static transformations on 1589 * children; this causes 1590 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 1591 * invoked when a child is drawn. 1592 * 1593 * Any subclass overriding 1594 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 1595 * set this property to true. 1596 * 1597 * @param enabled True to enable static transformations on children, false otherwise. 1598 * 1599 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 1600 */ 1601 protected void setStaticTransformationsEnabled(boolean enabled) { 1602 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 1603 } 1604 1605 /** 1606 * {@inheritDoc} 1607 * 1608 * @see #setStaticTransformationsEnabled(boolean) 1609 */ 1610 protected boolean getChildStaticTransformation(View child, Transformation t) { 1611 return false; 1612 } 1613 1614 /** 1615 * {@hide} 1616 */ 1617 @Override 1618 protected View findViewTraversal(int id) { 1619 if (id == mID) { 1620 return this; 1621 } 1622 1623 final View[] where = mChildren; 1624 final int len = mChildrenCount; 1625 1626 for (int i = 0; i < len; i++) { 1627 View v = where[i]; 1628 1629 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1630 v = v.findViewById(id); 1631 1632 if (v != null) { 1633 return v; 1634 } 1635 } 1636 } 1637 1638 return null; 1639 } 1640 1641 /** 1642 * {@hide} 1643 */ 1644 @Override 1645 protected View findViewWithTagTraversal(Object tag) { 1646 if (tag != null && tag.equals(mTag)) { 1647 return this; 1648 } 1649 1650 final View[] where = mChildren; 1651 final int len = mChildrenCount; 1652 1653 for (int i = 0; i < len; i++) { 1654 View v = where[i]; 1655 1656 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1657 v = v.findViewWithTag(tag); 1658 1659 if (v != null) { 1660 return v; 1661 } 1662 } 1663 } 1664 1665 return null; 1666 } 1667 1668 /** 1669 * Adds a child view. If no layout parameters are already set on the child, the 1670 * default parameters for this ViewGroup are set on the child. 1671 * 1672 * @param child the child view to add 1673 * 1674 * @see #generateDefaultLayoutParams() 1675 */ 1676 public void addView(View child) { 1677 addView(child, -1); 1678 } 1679 1680 /** 1681 * Adds a child view. If no layout parameters are already set on the child, the 1682 * default parameters for this ViewGroup are set on the child. 1683 * 1684 * @param child the child view to add 1685 * @param index the position at which to add the child 1686 * 1687 * @see #generateDefaultLayoutParams() 1688 */ 1689 public void addView(View child, int index) { 1690 LayoutParams params = child.getLayoutParams(); 1691 if (params == null) { 1692 params = generateDefaultLayoutParams(); 1693 if (params == null) { 1694 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 1695 } 1696 } 1697 addView(child, index, params); 1698 } 1699 1700 /** 1701 * Adds a child view with this ViewGroup's default layout parameters and the 1702 * specified width and height. 1703 * 1704 * @param child the child view to add 1705 */ 1706 public void addView(View child, int width, int height) { 1707 final LayoutParams params = generateDefaultLayoutParams(); 1708 params.width = width; 1709 params.height = height; 1710 addView(child, -1, params); 1711 } 1712 1713 /** 1714 * Adds a child view with the specified layout parameters. 1715 * 1716 * @param child the child view to add 1717 * @param params the layout parameters to set on the child 1718 */ 1719 public void addView(View child, LayoutParams params) { 1720 addView(child, -1, params); 1721 } 1722 1723 /** 1724 * Adds a child view with the specified layout parameters. 1725 * 1726 * @param child the child view to add 1727 * @param index the position at which to add the child 1728 * @param params the layout parameters to set on the child 1729 */ 1730 public void addView(View child, int index, LayoutParams params) { 1731 if (DBG) { 1732 System.out.println(this + " addView"); 1733 } 1734 1735 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 1736 // therefore, we call requestLayout() on ourselves before, so that the child's request 1737 // will be blocked at our level 1738 requestLayout(); 1739 invalidate(); 1740 addViewInner(child, index, params, false); 1741 } 1742 1743 /** 1744 * {@inheritDoc} 1745 */ 1746 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 1747 if (!checkLayoutParams(params)) { 1748 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 1749 } 1750 if (view.mParent != this) { 1751 throw new IllegalArgumentException("Given view not a child of " + this); 1752 } 1753 view.setLayoutParams(params); 1754 } 1755 1756 /** 1757 * {@inheritDoc} 1758 */ 1759 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 1760 return p != null; 1761 } 1762 1763 /** 1764 * Interface definition for a callback to be invoked when the hierarchy 1765 * within this view changed. The hierarchy changes whenever a child is added 1766 * to or removed from this view. 1767 */ 1768 public interface OnHierarchyChangeListener { 1769 /** 1770 * Called when a new child is added to a parent view. 1771 * 1772 * @param parent the view in which a child was added 1773 * @param child the new child view added in the hierarchy 1774 */ 1775 void onChildViewAdded(View parent, View child); 1776 1777 /** 1778 * Called when a child is removed from a parent view. 1779 * 1780 * @param parent the view from which the child was removed 1781 * @param child the child removed from the hierarchy 1782 */ 1783 void onChildViewRemoved(View parent, View child); 1784 } 1785 1786 /** 1787 * Register a callback to be invoked when a child is added to or removed 1788 * from this view. 1789 * 1790 * @param listener the callback to invoke on hierarchy change 1791 */ 1792 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 1793 mOnHierarchyChangeListener = listener; 1794 } 1795 1796 /** 1797 * Adds a view during layout. This is useful if in your onLayout() method, 1798 * you need to add more views (as does the list view for example). 1799 * 1800 * If index is negative, it means put it at the end of the list. 1801 * 1802 * @param child the view to add to the group 1803 * @param index the index at which the child must be added 1804 * @param params the layout parameters to associate with the child 1805 * @return true if the child was added, false otherwise 1806 */ 1807 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 1808 return addViewInLayout(child, index, params, false); 1809 } 1810 1811 /** 1812 * Adds a view during layout. This is useful if in your onLayout() method, 1813 * you need to add more views (as does the list view for example). 1814 * 1815 * If index is negative, it means put it at the end of the list. 1816 * 1817 * @param child the view to add to the group 1818 * @param index the index at which the child must be added 1819 * @param params the layout parameters to associate with the child 1820 * @param preventRequestLayout if true, calling this method will not trigger a 1821 * layout request on child 1822 * @return true if the child was added, false otherwise 1823 */ 1824 protected boolean addViewInLayout(View child, int index, LayoutParams params, 1825 boolean preventRequestLayout) { 1826 child.mParent = null; 1827 addViewInner(child, index, params, preventRequestLayout); 1828 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 1829 return true; 1830 } 1831 1832 /** 1833 * Prevents the specified child to be laid out during the next layout pass. 1834 * 1835 * @param child the child on which to perform the cleanup 1836 */ 1837 protected void cleanupLayoutState(View child) { 1838 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 1839 } 1840 1841 private void addViewInner(View child, int index, LayoutParams params, 1842 boolean preventRequestLayout) { 1843 1844 if (child.getParent() != null) { 1845 throw new IllegalStateException("The specified child already has a parent. " + 1846 "You must call removeView() on the child's parent first."); 1847 } 1848 1849 if (!checkLayoutParams(params)) { 1850 params = generateLayoutParams(params); 1851 } 1852 1853 if (preventRequestLayout) { 1854 child.mLayoutParams = params; 1855 } else { 1856 child.setLayoutParams(params); 1857 } 1858 1859 if (index < 0) { 1860 index = mChildrenCount; 1861 } 1862 1863 addInArray(child, index); 1864 1865 // tell our children 1866 if (preventRequestLayout) { 1867 child.assignParent(this); 1868 } else { 1869 child.mParent = this; 1870 } 1871 1872 if (child.hasFocus()) { 1873 requestChildFocus(child, child.findFocus()); 1874 } 1875 1876 AttachInfo ai = mAttachInfo; 1877 if (ai != null) { 1878 boolean lastKeepOn = ai.mKeepScreenOn; 1879 ai.mKeepScreenOn = false; 1880 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 1881 if (ai.mKeepScreenOn) { 1882 needGlobalAttributesUpdate(true); 1883 } 1884 ai.mKeepScreenOn = lastKeepOn; 1885 } 1886 1887 if (mOnHierarchyChangeListener != null) { 1888 mOnHierarchyChangeListener.onChildViewAdded(this, child); 1889 } 1890 1891 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 1892 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 1893 } 1894 } 1895 1896 private void addInArray(View child, int index) { 1897 View[] children = mChildren; 1898 final int count = mChildrenCount; 1899 final int size = children.length; 1900 if (index == count) { 1901 if (size == count) { 1902 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 1903 System.arraycopy(children, 0, mChildren, 0, size); 1904 children = mChildren; 1905 } 1906 children[mChildrenCount++] = child; 1907 } else if (index < count) { 1908 if (size == count) { 1909 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 1910 System.arraycopy(children, 0, mChildren, 0, index); 1911 System.arraycopy(children, index, mChildren, index + 1, count - index); 1912 children = mChildren; 1913 } else { 1914 System.arraycopy(children, index, children, index + 1, count - index); 1915 } 1916 children[index] = child; 1917 mChildrenCount++; 1918 } else { 1919 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 1920 } 1921 } 1922 1923 // This method also sets the child's mParent to null 1924 private void removeFromArray(int index) { 1925 final View[] children = mChildren; 1926 children[index].mParent = null; 1927 final int count = mChildrenCount; 1928 if (index == count - 1) { 1929 children[--mChildrenCount] = null; 1930 } else if (index >= 0 && index < count) { 1931 System.arraycopy(children, index + 1, children, index, count - index - 1); 1932 children[--mChildrenCount] = null; 1933 } else { 1934 throw new IndexOutOfBoundsException(); 1935 } 1936 } 1937 1938 // This method also sets the children's mParent to null 1939 private void removeFromArray(int start, int count) { 1940 final View[] children = mChildren; 1941 final int childrenCount = mChildrenCount; 1942 1943 start = Math.max(0, start); 1944 final int end = Math.min(childrenCount, start + count); 1945 1946 if (start == end) { 1947 return; 1948 } 1949 1950 if (end == childrenCount) { 1951 for (int i = start; i < end; i++) { 1952 children[i].mParent = null; 1953 children[i] = null; 1954 } 1955 } else { 1956 for (int i = start; i < end; i++) { 1957 children[i].mParent = null; 1958 } 1959 1960 // Since we're looping above, we might as well do the copy, but is arraycopy() 1961 // faster than the extra 2 bounds checks we would do in the loop? 1962 System.arraycopy(children, end, children, start, childrenCount - end); 1963 1964 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 1965 children[i] = null; 1966 } 1967 } 1968 1969 mChildrenCount -= (end - start); 1970 } 1971 1972 private void bindLayoutAnimation(View child) { 1973 Animation a = mLayoutAnimationController.getAnimationForView(child); 1974 child.setAnimation(a); 1975 } 1976 1977 /** 1978 * Subclasses should override this method to set layout animation 1979 * parameters on the supplied child. 1980 * 1981 * @param child the child to associate with animation parameters 1982 * @param params the child's layout parameters which hold the animation 1983 * parameters 1984 * @param index the index of the child in the view group 1985 * @param count the number of children in the view group 1986 */ 1987 protected void attachLayoutAnimationParameters(View child, 1988 LayoutParams params, int index, int count) { 1989 LayoutAnimationController.AnimationParameters animationParams = 1990 params.layoutAnimationParameters; 1991 if (animationParams == null) { 1992 animationParams = new LayoutAnimationController.AnimationParameters(); 1993 params.layoutAnimationParameters = animationParams; 1994 } 1995 1996 animationParams.count = count; 1997 animationParams.index = index; 1998 } 1999 2000 /** 2001 * {@inheritDoc} 2002 */ 2003 public void removeView(View view) { 2004 removeViewInternal(view); 2005 requestLayout(); 2006 invalidate(); 2007 } 2008 2009 /** 2010 * Removes a view during layout. This is useful if in your onLayout() method, 2011 * you need to remove more views. 2012 * 2013 * @param view the view to remove from the group 2014 */ 2015 public void removeViewInLayout(View view) { 2016 removeViewInternal(view); 2017 } 2018 2019 /** 2020 * Removes a range of views during layout. This is useful if in your onLayout() method, 2021 * you need to remove more views. 2022 * 2023 * @param start the index of the first view to remove from the group 2024 * @param count the number of views to remove from the group 2025 */ 2026 public void removeViewsInLayout(int start, int count) { 2027 removeViewsInternal(start, count); 2028 } 2029 2030 /** 2031 * Removes the view at the specified position in the group. 2032 * 2033 * @param index the position in the group of the view to remove 2034 */ 2035 public void removeViewAt(int index) { 2036 removeViewInternal(index, getChildAt(index)); 2037 requestLayout(); 2038 invalidate(); 2039 } 2040 2041 /** 2042 * Removes the specified range of views from the group. 2043 * 2044 * @param start the first position in the group of the range of views to remove 2045 * @param count the number of views to remove 2046 */ 2047 public void removeViews(int start, int count) { 2048 removeViewsInternal(start, count); 2049 requestLayout(); 2050 invalidate(); 2051 } 2052 2053 private void removeViewInternal(View view) { 2054 final int index = indexOfChild(view); 2055 if (index >= 0) { 2056 removeViewInternal(index, view); 2057 } 2058 } 2059 2060 private void removeViewInternal(int index, View view) { 2061 boolean clearChildFocus = false; 2062 if (view == mFocused) { 2063 view.clearFocusForRemoval(); 2064 clearChildFocus = true; 2065 } 2066 2067 if (view.getAnimation() != null) { 2068 addDisappearingView(view); 2069 } else if (view.mAttachInfo != null) { 2070 view.dispatchDetachedFromWindow(); 2071 } 2072 2073 if (mOnHierarchyChangeListener != null) { 2074 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2075 } 2076 2077 needGlobalAttributesUpdate(false); 2078 2079 removeFromArray(index); 2080 2081 if (clearChildFocus) { 2082 clearChildFocus(view); 2083 } 2084 } 2085 2086 private void removeViewsInternal(int start, int count) { 2087 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2088 final boolean notifyListener = onHierarchyChangeListener != null; 2089 final View focused = mFocused; 2090 final boolean detach = mAttachInfo != null; 2091 View clearChildFocus = null; 2092 2093 final View[] children = mChildren; 2094 final int end = start + count; 2095 2096 for (int i = start; i < end; i++) { 2097 final View view = children[i]; 2098 2099 if (view == focused) { 2100 view.clearFocusForRemoval(); 2101 clearChildFocus = view; 2102 } 2103 2104 if (view.getAnimation() != null) { 2105 addDisappearingView(view); 2106 } else if (detach) { 2107 view.dispatchDetachedFromWindow(); 2108 } 2109 2110 needGlobalAttributesUpdate(false); 2111 2112 if (notifyListener) { 2113 onHierarchyChangeListener.onChildViewRemoved(this, view); 2114 } 2115 } 2116 2117 removeFromArray(start, count); 2118 2119 if (clearChildFocus != null) { 2120 clearChildFocus(clearChildFocus); 2121 } 2122 } 2123 2124 /** 2125 * Call this method to remove all child views from the 2126 * ViewGroup. 2127 */ 2128 public void removeAllViews() { 2129 removeAllViewsInLayout(); 2130 requestLayout(); 2131 invalidate(); 2132 } 2133 2134 /** 2135 * Called by a ViewGroup subclass to remove child views from itself, 2136 * when it must first know its size on screen before it can calculate how many 2137 * child views it will render. An example is a Gallery or a ListView, which 2138 * may "have" 50 children, but actually only render the number of children 2139 * that can currently fit inside the object on screen. Do not call 2140 * this method unless you are extending ViewGroup and understand the 2141 * view measuring and layout pipeline. 2142 */ 2143 public void removeAllViewsInLayout() { 2144 final int count = mChildrenCount; 2145 if (count <= 0) { 2146 return; 2147 } 2148 2149 final View[] children = mChildren; 2150 mChildrenCount = 0; 2151 2152 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2153 final boolean notify = listener != null; 2154 final View focused = mFocused; 2155 final boolean detach = mAttachInfo != null; 2156 View clearChildFocus = null; 2157 2158 needGlobalAttributesUpdate(false); 2159 2160 for (int i = count - 1; i >= 0; i--) { 2161 final View view = children[i]; 2162 2163 if (view == focused) { 2164 view.clearFocusForRemoval(); 2165 clearChildFocus = view; 2166 } 2167 2168 if (view.getAnimation() != null) { 2169 addDisappearingView(view); 2170 } else if (detach) { 2171 view.dispatchDetachedFromWindow(); 2172 } 2173 2174 if (notify) { 2175 listener.onChildViewRemoved(this, view); 2176 } 2177 2178 view.mParent = null; 2179 children[i] = null; 2180 } 2181 2182 if (clearChildFocus != null) { 2183 clearChildFocus(clearChildFocus); 2184 } 2185 } 2186 2187 /** 2188 * Finishes the removal of a detached view. This method will dispatch the detached from 2189 * window event and notify the hierarchy change listener. 2190 * 2191 * @param child the child to be definitely removed from the view hierarchy 2192 * @param animate if true and the view has an animation, the view is placed in the 2193 * disappearing views list, otherwise, it is detached from the window 2194 * 2195 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2196 * @see #detachAllViewsFromParent() 2197 * @see #detachViewFromParent(View) 2198 * @see #detachViewFromParent(int) 2199 */ 2200 protected void removeDetachedView(View child, boolean animate) { 2201 if (child == mFocused) { 2202 child.clearFocus(); 2203 } 2204 2205 if (animate && child.getAnimation() != null) { 2206 addDisappearingView(child); 2207 } else if (child.mAttachInfo != null) { 2208 child.dispatchDetachedFromWindow(); 2209 } 2210 2211 if (mOnHierarchyChangeListener != null) { 2212 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2213 } 2214 } 2215 2216 /** 2217 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2218 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2219 * by calling {@link #getChildAt(int)}. 2220 * 2221 * This method should be called only for view which were detached from their parent. 2222 * 2223 * @param child the child to attach 2224 * @param index the index at which the child should be attached 2225 * @param params the layout parameters of the child 2226 * 2227 * @see #removeDetachedView(View, boolean) 2228 * @see #detachAllViewsFromParent() 2229 * @see #detachViewFromParent(View) 2230 * @see #detachViewFromParent(int) 2231 */ 2232 protected void attachViewToParent(View child, int index, LayoutParams params) { 2233 child.mLayoutParams = params; 2234 2235 if (index < 0) { 2236 index = mChildrenCount; 2237 } 2238 2239 addInArray(child, index); 2240 2241 child.mParent = this; 2242 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2243 2244 if (child.hasFocus()) { 2245 requestChildFocus(child, child.findFocus()); 2246 } 2247 } 2248 2249 /** 2250 * Detaches a view from its parent. Detaching a view should be temporary and followed 2251 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2252 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2253 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2254 * 2255 * @param child the child to detach 2256 * 2257 * @see #detachViewFromParent(int) 2258 * @see #detachViewsFromParent(int, int) 2259 * @see #detachAllViewsFromParent() 2260 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2261 * @see #removeDetachedView(View, boolean) 2262 */ 2263 protected void detachViewFromParent(View child) { 2264 removeFromArray(indexOfChild(child)); 2265 } 2266 2267 /** 2268 * Detaches a view from its parent. Detaching a view should be temporary and followed 2269 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2270 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2271 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2272 * 2273 * @param index the index of the child to detach 2274 * 2275 * @see #detachViewFromParent(View) 2276 * @see #detachAllViewsFromParent() 2277 * @see #detachViewsFromParent(int, int) 2278 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2279 * @see #removeDetachedView(View, boolean) 2280 */ 2281 protected void detachViewFromParent(int index) { 2282 removeFromArray(index); 2283 } 2284 2285 /** 2286 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2287 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2288 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2289 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2290 * 2291 * @param start the first index of the childrend range to detach 2292 * @param count the number of children to detach 2293 * 2294 * @see #detachViewFromParent(View) 2295 * @see #detachViewFromParent(int) 2296 * @see #detachAllViewsFromParent() 2297 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2298 * @see #removeDetachedView(View, boolean) 2299 */ 2300 protected void detachViewsFromParent(int start, int count) { 2301 removeFromArray(start, count); 2302 } 2303 2304 /** 2305 * Detaches all views from the parent. Detaching a view should be temporary and followed 2306 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2307 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2308 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2309 * 2310 * @see #detachViewFromParent(View) 2311 * @see #detachViewFromParent(int) 2312 * @see #detachViewsFromParent(int, int) 2313 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2314 * @see #removeDetachedView(View, boolean) 2315 */ 2316 protected void detachAllViewsFromParent() { 2317 final int count = mChildrenCount; 2318 if (count <= 0) { 2319 return; 2320 } 2321 2322 final View[] children = mChildren; 2323 mChildrenCount = 0; 2324 2325 for (int i = count - 1; i >= 0; i--) { 2326 children[i].mParent = null; 2327 children[i] = null; 2328 } 2329 } 2330 2331 /** 2332 * Don't call or override this method. It is used for the implementation of 2333 * the view hierarchy. 2334 */ 2335 public final void invalidateChild(View child, final Rect dirty) { 2336 if (ViewDebug.TRACE_HIERARCHY) { 2337 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2338 } 2339 2340 ViewParent parent = this; 2341 2342 final AttachInfo attachInfo = mAttachInfo; 2343 if (attachInfo != null) { 2344 final int[] location = attachInfo.mInvalidateChildLocation; 2345 location[CHILD_LEFT_INDEX] = child.mLeft; 2346 location[CHILD_TOP_INDEX] = child.mTop; 2347 2348 // If the child is drawing an animation, we want to copy this flag onto 2349 // ourselves and the parent to make sure the invalidate request goes 2350 // through 2351 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2352 2353 // Check whether the child that requests the invalidate is fully opaque 2354 final boolean isOpaque = child.isOpaque(); 2355 // Mark the child as dirty, using the appropriate flag 2356 // Make sure we do not set both flags at the same time 2357 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2358 2359 do { 2360 View view = null; 2361 if (parent instanceof View) { 2362 view = (View) parent; 2363 } 2364 2365 if (drawAnimation) { 2366 if (view != null) { 2367 view.mPrivateFlags |= DRAW_ANIMATION; 2368 } else if (parent instanceof ViewRoot) { 2369 ((ViewRoot) parent).mIsAnimating = true; 2370 } 2371 } 2372 2373 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2374 // flag coming from the child that initiated the invalidate 2375 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2376 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2377 } 2378 2379 parent = parent.invalidateChildInParent(location, dirty); 2380 } while (parent != null); 2381 } 2382 } 2383 2384 /** 2385 * Don't call or override this method. It is used for the implementation of 2386 * the view hierarchy. 2387 * 2388 * This implementation returns null if this ViewGroup does not have a parent, 2389 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2390 * does not intersect with this ViewGroup's bounds. 2391 */ 2392 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2393 if (ViewDebug.TRACE_HIERARCHY) { 2394 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2395 } 2396 2397 if ((mPrivateFlags & DRAWN) == DRAWN) { 2398 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2399 FLAG_OPTIMIZE_INVALIDATE) { 2400 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2401 location[CHILD_TOP_INDEX] - mScrollY); 2402 2403 final int left = mLeft; 2404 final int top = mTop; 2405 2406 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2407 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2408 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2409 2410 location[CHILD_LEFT_INDEX] = left; 2411 location[CHILD_TOP_INDEX] = top; 2412 2413 return mParent; 2414 } 2415 } else { 2416 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2417 2418 location[CHILD_LEFT_INDEX] = mLeft; 2419 location[CHILD_TOP_INDEX] = mTop; 2420 2421 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2422 mBottom - location[CHILD_TOP_INDEX]); 2423 2424 return mParent; 2425 } 2426 } 2427 2428 return null; 2429 } 2430 2431 /** 2432 * Offset a rectangle that is in a descendant's coordinate 2433 * space into our coordinate space. 2434 * @param descendant A descendant of this view 2435 * @param rect A rectangle defined in descendant's coordinate space. 2436 */ 2437 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 2438 offsetRectBetweenParentAndChild(descendant, rect, true, false); 2439 } 2440 2441 /** 2442 * Offset a rectangle that is in our coordinate space into an ancestor's 2443 * coordinate space. 2444 * @param descendant A descendant of this view 2445 * @param rect A rectangle defined in descendant's coordinate space. 2446 */ 2447 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 2448 offsetRectBetweenParentAndChild(descendant, rect, false, false); 2449 } 2450 2451 /** 2452 * Helper method that offsets a rect either from parent to descendant or 2453 * descendant to parent. 2454 */ 2455 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 2456 boolean offsetFromChildToParent, boolean clipToBounds) { 2457 2458 // already in the same coord system :) 2459 if (descendant == this) { 2460 return; 2461 } 2462 2463 ViewParent theParent = descendant.mParent; 2464 2465 // search and offset up to the parent 2466 while ((theParent != null) 2467 && (theParent instanceof View) 2468 && (theParent != this)) { 2469 2470 if (offsetFromChildToParent) { 2471 rect.offset(descendant.mLeft - descendant.mScrollX, 2472 descendant.mTop - descendant.mScrollY); 2473 if (clipToBounds) { 2474 View p = (View) theParent; 2475 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2476 } 2477 } else { 2478 if (clipToBounds) { 2479 View p = (View) theParent; 2480 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2481 } 2482 rect.offset(descendant.mScrollX - descendant.mLeft, 2483 descendant.mScrollY - descendant.mTop); 2484 } 2485 2486 descendant = (View) theParent; 2487 theParent = descendant.mParent; 2488 } 2489 2490 // now that we are up to this view, need to offset one more time 2491 // to get into our coordinate space 2492 if (theParent == this) { 2493 if (offsetFromChildToParent) { 2494 rect.offset(descendant.mLeft - descendant.mScrollX, 2495 descendant.mTop - descendant.mScrollY); 2496 } else { 2497 rect.offset(descendant.mScrollX - descendant.mLeft, 2498 descendant.mScrollY - descendant.mTop); 2499 } 2500 } else { 2501 throw new IllegalArgumentException("parameter must be a descendant of this view"); 2502 } 2503 } 2504 2505 /** 2506 * Offset the vertical location of all children of this view by the specified number of pixels. 2507 * 2508 * @param offset the number of pixels to offset 2509 * 2510 * @hide 2511 */ 2512 public void offsetChildrenTopAndBottom(int offset) { 2513 final int count = mChildrenCount; 2514 final View[] children = mChildren; 2515 2516 for (int i = 0; i < count; i++) { 2517 final View v = children[i]; 2518 v.mTop += offset; 2519 v.mBottom += offset; 2520 } 2521 } 2522 2523 /** 2524 * {@inheritDoc} 2525 */ 2526 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 2527 int dx = child.mLeft - mScrollX; 2528 int dy = child.mTop - mScrollY; 2529 if (offset != null) { 2530 offset.x += dx; 2531 offset.y += dy; 2532 } 2533 r.offset(dx, dy); 2534 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 2535 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 2536 } 2537 2538 /** 2539 * {@inheritDoc} 2540 */ 2541 @Override 2542 protected abstract void onLayout(boolean changed, 2543 int l, int t, int r, int b); 2544 2545 /** 2546 * Indicates whether the view group has the ability to animate its children 2547 * after the first layout. 2548 * 2549 * @return true if the children can be animated, false otherwise 2550 */ 2551 protected boolean canAnimate() { 2552 return mLayoutAnimationController != null; 2553 } 2554 2555 /** 2556 * Runs the layout animation. Calling this method triggers a relayout of 2557 * this view group. 2558 */ 2559 public void startLayoutAnimation() { 2560 if (mLayoutAnimationController != null) { 2561 mGroupFlags |= FLAG_RUN_ANIMATION; 2562 requestLayout(); 2563 } 2564 } 2565 2566 /** 2567 * Schedules the layout animation to be played after the next layout pass 2568 * of this view group. This can be used to restart the layout animation 2569 * when the content of the view group changes or when the activity is 2570 * paused and resumed. 2571 */ 2572 public void scheduleLayoutAnimation() { 2573 mGroupFlags |= FLAG_RUN_ANIMATION; 2574 } 2575 2576 /** 2577 * Sets the layout animation controller used to animate the group's 2578 * children after the first layout. 2579 * 2580 * @param controller the animation controller 2581 */ 2582 public void setLayoutAnimation(LayoutAnimationController controller) { 2583 mLayoutAnimationController = controller; 2584 if (mLayoutAnimationController != null) { 2585 mGroupFlags |= FLAG_RUN_ANIMATION; 2586 } 2587 } 2588 2589 /** 2590 * Returns the layout animation controller used to animate the group's 2591 * children. 2592 * 2593 * @return the current animation controller 2594 */ 2595 public LayoutAnimationController getLayoutAnimation() { 2596 return mLayoutAnimationController; 2597 } 2598 2599 /** 2600 * Indicates whether the children's drawing cache is used during a layout 2601 * animation. By default, the drawing cache is enabled but this will prevent 2602 * nested layout animations from working. To nest animations, you must disable 2603 * the cache. 2604 * 2605 * @return true if the animation cache is enabled, false otherwise 2606 * 2607 * @see #setAnimationCacheEnabled(boolean) 2608 * @see View#setDrawingCacheEnabled(boolean) 2609 */ 2610 @ViewDebug.ExportedProperty 2611 public boolean isAnimationCacheEnabled() { 2612 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2613 } 2614 2615 /** 2616 * Enables or disables the children's drawing cache during a layout animation. 2617 * By default, the drawing cache is enabled but this will prevent nested 2618 * layout animations from working. To nest animations, you must disable the 2619 * cache. 2620 * 2621 * @param enabled true to enable the animation cache, false otherwise 2622 * 2623 * @see #isAnimationCacheEnabled() 2624 * @see View#setDrawingCacheEnabled(boolean) 2625 */ 2626 public void setAnimationCacheEnabled(boolean enabled) { 2627 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 2628 } 2629 2630 /** 2631 * Indicates whether this ViewGroup will always try to draw its children using their 2632 * drawing cache. By default this property is enabled. 2633 * 2634 * @return true if the animation cache is enabled, false otherwise 2635 * 2636 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2637 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2638 * @see View#setDrawingCacheEnabled(boolean) 2639 */ 2640 @ViewDebug.ExportedProperty 2641 public boolean isAlwaysDrawnWithCacheEnabled() { 2642 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 2643 } 2644 2645 /** 2646 * Indicates whether this ViewGroup will always try to draw its children using their 2647 * drawing cache. This property can be set to true when the cache rendering is 2648 * slightly different from the children's normal rendering. Renderings can be different, 2649 * for instance, when the cache's quality is set to low. 2650 * 2651 * When this property is disabled, the ViewGroup will use the drawing cache of its 2652 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 2653 * when to start using the drawing cache and when to stop using it. 2654 * 2655 * @param always true to always draw with the drawing cache, false otherwise 2656 * 2657 * @see #isAlwaysDrawnWithCacheEnabled() 2658 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2659 * @see View#setDrawingCacheEnabled(boolean) 2660 * @see View#setDrawingCacheQuality(int) 2661 */ 2662 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 2663 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 2664 } 2665 2666 /** 2667 * Indicates whether the ViewGroup is currently drawing its children using 2668 * their drawing cache. 2669 * 2670 * @return true if children should be drawn with their cache, false otherwise 2671 * 2672 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2673 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2674 */ 2675 @ViewDebug.ExportedProperty 2676 protected boolean isChildrenDrawnWithCacheEnabled() { 2677 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 2678 } 2679 2680 /** 2681 * Tells the ViewGroup to draw its children using their drawing cache. This property 2682 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 2683 * will be used only if it has been enabled. 2684 * 2685 * Subclasses should call this method to start and stop using the drawing cache when 2686 * they perform performance sensitive operations, like scrolling or animating. 2687 * 2688 * @param enabled true if children should be drawn with their cache, false otherwise 2689 * 2690 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2691 * @see #isChildrenDrawnWithCacheEnabled() 2692 */ 2693 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 2694 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 2695 } 2696 2697 private void setBooleanFlag(int flag, boolean value) { 2698 if (value) { 2699 mGroupFlags |= flag; 2700 } else { 2701 mGroupFlags &= ~flag; 2702 } 2703 } 2704 2705 /** 2706 * Returns an integer indicating what types of drawing caches are kept in memory. 2707 * 2708 * @see #setPersistentDrawingCache(int) 2709 * @see #setAnimationCacheEnabled(boolean) 2710 * 2711 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 2712 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2713 * and {@link #PERSISTENT_ALL_CACHES} 2714 */ 2715 @ViewDebug.ExportedProperty(mapping = { 2716 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 2717 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ANIMATION"), 2718 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 2719 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 2720 }) 2721 public int getPersistentDrawingCache() { 2722 return mPersistentDrawingCache; 2723 } 2724 2725 /** 2726 * Indicates what types of drawing caches should be kept in memory after 2727 * they have been created. 2728 * 2729 * @see #getPersistentDrawingCache() 2730 * @see #setAnimationCacheEnabled(boolean) 2731 * 2732 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 2733 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2734 * and {@link #PERSISTENT_ALL_CACHES} 2735 */ 2736 public void setPersistentDrawingCache(int drawingCacheToKeep) { 2737 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 2738 } 2739 2740 /** 2741 * Returns a new set of layout parameters based on the supplied attributes set. 2742 * 2743 * @param attrs the attributes to build the layout parameters from 2744 * 2745 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2746 * of its descendants 2747 */ 2748 public LayoutParams generateLayoutParams(AttributeSet attrs) { 2749 return new LayoutParams(getContext(), attrs); 2750 } 2751 2752 /** 2753 * Returns a safe set of layout parameters based on the supplied layout params. 2754 * When a ViewGroup is passed a View whose layout params do not pass the test of 2755 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 2756 * is invoked. This method should return a new set of layout params suitable for 2757 * this ViewGroup, possibly by copying the appropriate attributes from the 2758 * specified set of layout params. 2759 * 2760 * @param p The layout parameters to convert into a suitable set of layout parameters 2761 * for this ViewGroup. 2762 * 2763 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2764 * of its descendants 2765 */ 2766 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 2767 return p; 2768 } 2769 2770 /** 2771 * Returns a set of default layout parameters. These parameters are requested 2772 * when the View passed to {@link #addView(View)} has no layout parameters 2773 * already set. If null is returned, an exception is thrown from addView. 2774 * 2775 * @return a set of default layout parameters or null 2776 */ 2777 protected LayoutParams generateDefaultLayoutParams() { 2778 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 2779 } 2780 2781 /** 2782 * @hide 2783 */ 2784 @Override 2785 protected boolean dispatchConsistencyCheck(int consistency) { 2786 boolean result = super.dispatchConsistencyCheck(consistency); 2787 2788 final int count = mChildrenCount; 2789 final View[] children = mChildren; 2790 for (int i = 0; i < count; i++) { 2791 if (!children[i].dispatchConsistencyCheck(consistency)) result = false; 2792 } 2793 2794 return result; 2795 } 2796 2797 /** 2798 * @hide 2799 */ 2800 @Override 2801 protected boolean onConsistencyCheck(int consistency) { 2802 boolean result = super.onConsistencyCheck(consistency); 2803 2804 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 2805 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 2806 2807 if (checkLayout) { 2808 final int count = mChildrenCount; 2809 final View[] children = mChildren; 2810 for (int i = 0; i < count; i++) { 2811 if (children[i].getParent() != this) { 2812 result = false; 2813 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 2814 "View " + children[i] + " has no parent/a parent that is not " + this); 2815 } 2816 } 2817 } 2818 2819 if (checkDrawing) { 2820 // If this group is dirty, check that the parent is dirty as well 2821 if ((mPrivateFlags & DIRTY_MASK) != 0) { 2822 final ViewParent parent = getParent(); 2823 if (parent != null && !(parent instanceof ViewRoot)) { 2824 if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { 2825 result = false; 2826 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 2827 "ViewGroup " + this + " is dirty but its parent is not: " + this); 2828 } 2829 } 2830 } 2831 } 2832 2833 return result; 2834 } 2835 2836 /** 2837 * {@inheritDoc} 2838 */ 2839 @Override 2840 protected void debug(int depth) { 2841 super.debug(depth); 2842 String output; 2843 2844 if (mFocused != null) { 2845 output = debugIndent(depth); 2846 output += "mFocused"; 2847 Log.d(VIEW_LOG_TAG, output); 2848 } 2849 if (mChildrenCount != 0) { 2850 output = debugIndent(depth); 2851 output += "{"; 2852 Log.d(VIEW_LOG_TAG, output); 2853 } 2854 int count = mChildrenCount; 2855 for (int i = 0; i < count; i++) { 2856 View child = mChildren[i]; 2857 child.debug(depth + 1); 2858 } 2859 2860 if (mChildrenCount != 0) { 2861 output = debugIndent(depth); 2862 output += "}"; 2863 Log.d(VIEW_LOG_TAG, output); 2864 } 2865 } 2866 2867 /** 2868 * Returns the position in the group of the specified child view. 2869 * 2870 * @param child the view for which to get the position 2871 * @return a positive integer representing the position of the view in the 2872 * group, or -1 if the view does not exist in the group 2873 */ 2874 public int indexOfChild(View child) { 2875 final int count = mChildrenCount; 2876 final View[] children = mChildren; 2877 for (int i = 0; i < count; i++) { 2878 if (children[i] == child) { 2879 return i; 2880 } 2881 } 2882 return -1; 2883 } 2884 2885 /** 2886 * Returns the number of children in the group. 2887 * 2888 * @return a positive integer representing the number of children in 2889 * the group 2890 */ 2891 public int getChildCount() { 2892 return mChildrenCount; 2893 } 2894 2895 /** 2896 * Returns the view at the specified position in the group. 2897 * 2898 * @param index the position at which to get the view from 2899 * @return the view at the specified position or null if the position 2900 * does not exist within the group 2901 */ 2902 public View getChildAt(int index) { 2903 try { 2904 return mChildren[index]; 2905 } catch (IndexOutOfBoundsException ex) { 2906 return null; 2907 } 2908 } 2909 2910 /** 2911 * Ask all of the children of this view to measure themselves, taking into 2912 * account both the MeasureSpec requirements for this view and its padding. 2913 * We skip children that are in the GONE state The heavy lifting is done in 2914 * getChildMeasureSpec. 2915 * 2916 * @param widthMeasureSpec The width requirements for this view 2917 * @param heightMeasureSpec The height requirements for this view 2918 */ 2919 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 2920 final int size = mChildrenCount; 2921 final View[] children = mChildren; 2922 for (int i = 0; i < size; ++i) { 2923 final View child = children[i]; 2924 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 2925 measureChild(child, widthMeasureSpec, heightMeasureSpec); 2926 } 2927 } 2928 } 2929 2930 /** 2931 * Ask one of the children of this view to measure itself, taking into 2932 * account both the MeasureSpec requirements for this view and its padding. 2933 * The heavy lifting is done in getChildMeasureSpec. 2934 * 2935 * @param child The child to measure 2936 * @param parentWidthMeasureSpec The width requirements for this view 2937 * @param parentHeightMeasureSpec The height requirements for this view 2938 */ 2939 protected void measureChild(View child, int parentWidthMeasureSpec, 2940 int parentHeightMeasureSpec) { 2941 final LayoutParams lp = child.getLayoutParams(); 2942 2943 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 2944 mPaddingLeft + mPaddingRight, lp.width); 2945 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 2946 mPaddingTop + mPaddingBottom, lp.height); 2947 2948 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 2949 } 2950 2951 /** 2952 * Ask one of the children of this view to measure itself, taking into 2953 * account both the MeasureSpec requirements for this view and its padding 2954 * and margins. The child must have MarginLayoutParams The heavy lifting is 2955 * done in getChildMeasureSpec. 2956 * 2957 * @param child The child to measure 2958 * @param parentWidthMeasureSpec The width requirements for this view 2959 * @param widthUsed Extra space that has been used up by the parent 2960 * horizontally (possibly by other children of the parent) 2961 * @param parentHeightMeasureSpec The height requirements for this view 2962 * @param heightUsed Extra space that has been used up by the parent 2963 * vertically (possibly by other children of the parent) 2964 */ 2965 protected void measureChildWithMargins(View child, 2966 int parentWidthMeasureSpec, int widthUsed, 2967 int parentHeightMeasureSpec, int heightUsed) { 2968 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 2969 2970 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 2971 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 2972 + widthUsed, lp.width); 2973 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 2974 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 2975 + heightUsed, lp.height); 2976 2977 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 2978 } 2979 2980 /** 2981 * Does the hard part of measureChildren: figuring out the MeasureSpec to 2982 * pass to a particular child. This method figures out the right MeasureSpec 2983 * for one dimension (height or width) of one child view. 2984 * 2985 * The goal is to combine information from our MeasureSpec with the 2986 * LayoutParams of the child to get the best possible results. For example, 2987 * if the this view knows its size (because its MeasureSpec has a mode of 2988 * EXACTLY), and the child has indicated in its LayoutParams that it wants 2989 * to be the same size as the parent, the parent should ask the child to 2990 * layout given an exact size. 2991 * 2992 * @param spec The requirements for this view 2993 * @param padding The padding of this view for the current dimension and 2994 * margins, if applicable 2995 * @param childDimension How big the child wants to be in the current 2996 * dimension 2997 * @return a MeasureSpec integer for the child 2998 */ 2999 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 3000 int specMode = MeasureSpec.getMode(spec); 3001 int specSize = MeasureSpec.getSize(spec); 3002 3003 int size = Math.max(0, specSize - padding); 3004 3005 int resultSize = 0; 3006 int resultMode = 0; 3007 3008 switch (specMode) { 3009 // Parent has imposed an exact size on us 3010 case MeasureSpec.EXACTLY: 3011 if (childDimension >= 0) { 3012 resultSize = childDimension; 3013 resultMode = MeasureSpec.EXACTLY; 3014 } else if (childDimension == LayoutParams.FILL_PARENT) { 3015 // Child wants to be our size. So be it. 3016 resultSize = size; 3017 resultMode = MeasureSpec.EXACTLY; 3018 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3019 // Child wants to determine its own size. It can't be 3020 // bigger than us. 3021 resultSize = size; 3022 resultMode = MeasureSpec.AT_MOST; 3023 } 3024 break; 3025 3026 // Parent has imposed a maximum size on us 3027 case MeasureSpec.AT_MOST: 3028 if (childDimension >= 0) { 3029 // Child wants a specific size... so be it 3030 resultSize = childDimension; 3031 resultMode = MeasureSpec.EXACTLY; 3032 } else if (childDimension == LayoutParams.FILL_PARENT) { 3033 // Child wants to be our size, but our size is not fixed. 3034 // Constrain child to not be bigger than us. 3035 resultSize = size; 3036 resultMode = MeasureSpec.AT_MOST; 3037 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3038 // Child wants to determine its own size. It can't be 3039 // bigger than us. 3040 resultSize = size; 3041 resultMode = MeasureSpec.AT_MOST; 3042 } 3043 break; 3044 3045 // Parent asked to see how big we want to be 3046 case MeasureSpec.UNSPECIFIED: 3047 if (childDimension >= 0) { 3048 // Child wants a specific size... let him have it 3049 resultSize = childDimension; 3050 resultMode = MeasureSpec.EXACTLY; 3051 } else if (childDimension == LayoutParams.FILL_PARENT) { 3052 // Child wants to be our size... find out how big it should 3053 // be 3054 resultSize = 0; 3055 resultMode = MeasureSpec.UNSPECIFIED; 3056 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 3057 // Child wants to determine its own size.... find out how 3058 // big it should be 3059 resultSize = 0; 3060 resultMode = MeasureSpec.UNSPECIFIED; 3061 } 3062 break; 3063 } 3064 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 3065 } 3066 3067 3068 /** 3069 * Removes any pending animations for views that have been removed. Call 3070 * this if you don't want animations for exiting views to stack up. 3071 */ 3072 public void clearDisappearingChildren() { 3073 if (mDisappearingChildren != null) { 3074 mDisappearingChildren.clear(); 3075 } 3076 } 3077 3078 /** 3079 * Add a view which is removed from mChildren but still needs animation 3080 * 3081 * @param v View to add 3082 */ 3083 private void addDisappearingView(View v) { 3084 ArrayList<View> disappearingChildren = mDisappearingChildren; 3085 3086 if (disappearingChildren == null) { 3087 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3088 } 3089 3090 disappearingChildren.add(v); 3091 } 3092 3093 /** 3094 * Cleanup a view when its animation is done. This may mean removing it from 3095 * the list of disappearing views. 3096 * 3097 * @param view The view whose animation has finished 3098 * @param animation The animation, cannot be null 3099 */ 3100 private void finishAnimatingView(final View view, Animation animation) { 3101 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3102 if (disappearingChildren != null) { 3103 if (disappearingChildren.contains(view)) { 3104 disappearingChildren.remove(view); 3105 3106 if (view.mAttachInfo != null) { 3107 view.dispatchDetachedFromWindow(); 3108 } 3109 3110 view.clearAnimation(); 3111 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3112 } 3113 } 3114 3115 if (animation != null && !animation.getFillAfter()) { 3116 view.clearAnimation(); 3117 } 3118 3119 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3120 view.onAnimationEnd(); 3121 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3122 // so we'd rather be safe than sorry 3123 view.mPrivateFlags &= ~ANIMATION_STARTED; 3124 // Draw one more frame after the animation is done 3125 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3126 } 3127 } 3128 3129 /** 3130 * {@inheritDoc} 3131 */ 3132 @Override 3133 public boolean gatherTransparentRegion(Region region) { 3134 // If no transparent regions requested, we are always opaque. 3135 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3136 if (meOpaque && region == null) { 3137 // The caller doesn't care about the region, so stop now. 3138 return true; 3139 } 3140 super.gatherTransparentRegion(region); 3141 final View[] children = mChildren; 3142 final int count = mChildrenCount; 3143 boolean noneOfTheChildrenAreTransparent = true; 3144 for (int i = 0; i < count; i++) { 3145 final View child = children[i]; 3146 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3147 if (!child.gatherTransparentRegion(region)) { 3148 noneOfTheChildrenAreTransparent = false; 3149 } 3150 } 3151 } 3152 return meOpaque || noneOfTheChildrenAreTransparent; 3153 } 3154 3155 /** 3156 * {@inheritDoc} 3157 */ 3158 public void requestTransparentRegion(View child) { 3159 if (child != null) { 3160 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3161 if (mParent != null) { 3162 mParent.requestTransparentRegion(this); 3163 } 3164 } 3165 } 3166 3167 3168 @Override 3169 protected boolean fitSystemWindows(Rect insets) { 3170 boolean done = super.fitSystemWindows(insets); 3171 if (!done) { 3172 final int count = mChildrenCount; 3173 final View[] children = mChildren; 3174 for (int i = 0; i < count; i++) { 3175 done = children[i].fitSystemWindows(insets); 3176 if (done) { 3177 break; 3178 } 3179 } 3180 } 3181 return done; 3182 } 3183 3184 /** 3185 * Returns the animation listener to which layout animation events are 3186 * sent. 3187 * 3188 * @return an {@link android.view.animation.Animation.AnimationListener} 3189 */ 3190 public Animation.AnimationListener getLayoutAnimationListener() { 3191 return mAnimationListener; 3192 } 3193 3194 @Override 3195 protected void drawableStateChanged() { 3196 super.drawableStateChanged(); 3197 3198 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3199 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3200 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3201 + " child has duplicateParentState set to true"); 3202 } 3203 3204 final View[] children = mChildren; 3205 final int count = mChildrenCount; 3206 3207 for (int i = 0; i < count; i++) { 3208 final View child = children[i]; 3209 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3210 child.refreshDrawableState(); 3211 } 3212 } 3213 } 3214 } 3215 3216 @Override 3217 protected int[] onCreateDrawableState(int extraSpace) { 3218 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3219 return super.onCreateDrawableState(extraSpace); 3220 } 3221 3222 int need = 0; 3223 int n = getChildCount(); 3224 for (int i = 0; i < n; i++) { 3225 int[] childState = getChildAt(i).getDrawableState(); 3226 3227 if (childState != null) { 3228 need += childState.length; 3229 } 3230 } 3231 3232 int[] state = super.onCreateDrawableState(extraSpace + need); 3233 3234 for (int i = 0; i < n; i++) { 3235 int[] childState = getChildAt(i).getDrawableState(); 3236 3237 if (childState != null) { 3238 state = mergeDrawableStates(state, childState); 3239 } 3240 } 3241 3242 return state; 3243 } 3244 3245 /** 3246 * Sets whether this ViewGroup's drawable states also include 3247 * its children's drawable states. This is used, for example, to 3248 * make a group appear to be focused when its child EditText or button 3249 * is focused. 3250 */ 3251 public void setAddStatesFromChildren(boolean addsStates) { 3252 if (addsStates) { 3253 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3254 } else { 3255 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3256 } 3257 3258 refreshDrawableState(); 3259 } 3260 3261 /** 3262 * Returns whether this ViewGroup's drawable states also include 3263 * its children's drawable states. This is used, for example, to 3264 * make a group appear to be focused when its child EditText or button 3265 * is focused. 3266 */ 3267 public boolean addStatesFromChildren() { 3268 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3269 } 3270 3271 /** 3272 * If {link #addStatesFromChildren} is true, refreshes this group's 3273 * drawable state (to include the states from its children). 3274 */ 3275 public void childDrawableStateChanged(View child) { 3276 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3277 refreshDrawableState(); 3278 } 3279 } 3280 3281 /** 3282 * Specifies the animation listener to which layout animation events must 3283 * be sent. Only 3284 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3285 * and 3286 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3287 * are invoked. 3288 * 3289 * @param animationListener the layout animation listener 3290 */ 3291 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3292 mAnimationListener = animationListener; 3293 } 3294 3295 /** 3296 * LayoutParams are used by views to tell their parents how they want to be 3297 * laid out. See 3298 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3299 * for a list of all child view attributes that this class supports. 3300 * 3301 * <p> 3302 * The base LayoutParams class just describes how big the view wants to be 3303 * for both width and height. For each dimension, it can specify one of: 3304 * <ul> 3305 * <li> an exact number 3306 * <li>FILL_PARENT, which means the view wants to be as big as its parent 3307 * (minus padding) 3308 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3309 * to enclose its content (plus padding) 3310 * </ul> 3311 * There are subclasses of LayoutParams for different subclasses of 3312 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3313 * LayoutParams which adds an X and Y value. 3314 * 3315 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3316 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3317 */ 3318 public static class LayoutParams { 3319 /** 3320 * Special value for the height or width requested by a View. 3321 * FILL_PARENT means that the view wants to fill the available space 3322 * within the parent, taking the parent's padding into account. 3323 */ 3324 public static final int FILL_PARENT = -1; 3325 3326 /** 3327 * Special value for the height or width requested by a View. 3328 * WRAP_CONTENT means that the view wants to be just large enough to fit 3329 * its own internal content, taking its own padding into account. 3330 */ 3331 public static final int WRAP_CONTENT = -2; 3332 3333 /** 3334 * Information about how wide the view wants to be. Can be an exact 3335 * size, or one of the constants FILL_PARENT or WRAP_CONTENT. 3336 */ 3337 @ViewDebug.ExportedProperty(mapping = { 3338 @ViewDebug.IntToString(from = FILL_PARENT, to = "FILL_PARENT"), 3339 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3340 }) 3341 public int width; 3342 3343 /** 3344 * Information about how tall the view wants to be. Can be an exact 3345 * size, or one of the constants FILL_PARENT or WRAP_CONTENT. 3346 */ 3347 @ViewDebug.ExportedProperty(mapping = { 3348 @ViewDebug.IntToString(from = FILL_PARENT, to = "FILL_PARENT"), 3349 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3350 }) 3351 public int height; 3352 3353 /** 3354 * Used to animate layouts. 3355 */ 3356 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 3357 3358 /** 3359 * Creates a new set of layout parameters. The values are extracted from 3360 * the supplied attributes set and context. The XML attributes mapped 3361 * to this set of layout parameters are: 3362 * 3363 * <ul> 3364 * <li><code>layout_width</code>: the width, either an exact value, 3365 * {@link #WRAP_CONTENT} or {@link #FILL_PARENT}</li> 3366 * <li><code>layout_height</code>: the height, either an exact value, 3367 * {@link #WRAP_CONTENT} or {@link #FILL_PARENT}</li> 3368 * </ul> 3369 * 3370 * @param c the application environment 3371 * @param attrs the set of attributes from which to extract the layout 3372 * parameters' values 3373 */ 3374 public LayoutParams(Context c, AttributeSet attrs) { 3375 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 3376 setBaseAttributes(a, 3377 R.styleable.ViewGroup_Layout_layout_width, 3378 R.styleable.ViewGroup_Layout_layout_height); 3379 a.recycle(); 3380 } 3381 3382 /** 3383 * Creates a new set of layout parameters with the specified width 3384 * and height. 3385 * 3386 * @param width the width, either {@link #FILL_PARENT}, 3387 * {@link #WRAP_CONTENT} or a fixed size in pixels 3388 * @param height the height, either {@link #FILL_PARENT}, 3389 * {@link #WRAP_CONTENT} or a fixed size in pixels 3390 */ 3391 public LayoutParams(int width, int height) { 3392 this.width = width; 3393 this.height = height; 3394 } 3395 3396 /** 3397 * Copy constructor. Clones the width and height values of the source. 3398 * 3399 * @param source The layout params to copy from. 3400 */ 3401 public LayoutParams(LayoutParams source) { 3402 this.width = source.width; 3403 this.height = source.height; 3404 } 3405 3406 /** 3407 * Used internally by MarginLayoutParams. 3408 * @hide 3409 */ 3410 LayoutParams() { 3411 } 3412 3413 /** 3414 * Extracts the layout parameters from the supplied attributes. 3415 * 3416 * @param a the style attributes to extract the parameters from 3417 * @param widthAttr the identifier of the width attribute 3418 * @param heightAttr the identifier of the height attribute 3419 */ 3420 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 3421 width = a.getLayoutDimension(widthAttr, "layout_width"); 3422 height = a.getLayoutDimension(heightAttr, "layout_height"); 3423 } 3424 3425 /** 3426 * Returns a String representation of this set of layout parameters. 3427 * 3428 * @param output the String to prepend to the internal representation 3429 * @return a String with the following format: output + 3430 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 3431 * 3432 * @hide 3433 */ 3434 public String debug(String output) { 3435 return output + "ViewGroup.LayoutParams={ width=" 3436 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 3437 } 3438 3439 /** 3440 * Converts the specified size to a readable String. 3441 * 3442 * @param size the size to convert 3443 * @return a String instance representing the supplied size 3444 * 3445 * @hide 3446 */ 3447 protected static String sizeToString(int size) { 3448 if (size == WRAP_CONTENT) { 3449 return "wrap-content"; 3450 } 3451 if (size == FILL_PARENT) { 3452 return "fill-parent"; 3453 } 3454 return String.valueOf(size); 3455 } 3456 } 3457 3458 /** 3459 * Per-child layout information for layouts that support margins. 3460 * See 3461 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 3462 * for a list of all child view attributes that this class supports. 3463 */ 3464 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 3465 /** 3466 * The left margin in pixels of the child. 3467 */ 3468 @ViewDebug.ExportedProperty 3469 public int leftMargin; 3470 3471 /** 3472 * The top margin in pixels of the child. 3473 */ 3474 @ViewDebug.ExportedProperty 3475 public int topMargin; 3476 3477 /** 3478 * The right margin in pixels of the child. 3479 */ 3480 @ViewDebug.ExportedProperty 3481 public int rightMargin; 3482 3483 /** 3484 * The bottom margin in pixels of the child. 3485 */ 3486 @ViewDebug.ExportedProperty 3487 public int bottomMargin; 3488 3489 /** 3490 * Creates a new set of layout parameters. The values are extracted from 3491 * the supplied attributes set and context. 3492 * 3493 * @param c the application environment 3494 * @param attrs the set of attributes from which to extract the layout 3495 * parameters' values 3496 */ 3497 public MarginLayoutParams(Context c, AttributeSet attrs) { 3498 super(); 3499 3500 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 3501 setBaseAttributes(a, 3502 R.styleable.ViewGroup_MarginLayout_layout_width, 3503 R.styleable.ViewGroup_MarginLayout_layout_height); 3504 3505 int margin = a.getDimensionPixelSize( 3506 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 3507 if (margin >= 0) { 3508 leftMargin = margin; 3509 topMargin = margin; 3510 rightMargin= margin; 3511 bottomMargin = margin; 3512 } else { 3513 leftMargin = a.getDimensionPixelSize( 3514 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 3515 topMargin = a.getDimensionPixelSize( 3516 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 3517 rightMargin = a.getDimensionPixelSize( 3518 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 3519 bottomMargin = a.getDimensionPixelSize( 3520 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 3521 } 3522 3523 a.recycle(); 3524 } 3525 3526 /** 3527 * {@inheritDoc} 3528 */ 3529 public MarginLayoutParams(int width, int height) { 3530 super(width, height); 3531 } 3532 3533 /** 3534 * Copy constructor. Clones the width, height and margin values of the source. 3535 * 3536 * @param source The layout params to copy from. 3537 */ 3538 public MarginLayoutParams(MarginLayoutParams source) { 3539 this.width = source.width; 3540 this.height = source.height; 3541 3542 this.leftMargin = source.leftMargin; 3543 this.topMargin = source.topMargin; 3544 this.rightMargin = source.rightMargin; 3545 this.bottomMargin = source.bottomMargin; 3546 } 3547 3548 /** 3549 * {@inheritDoc} 3550 */ 3551 public MarginLayoutParams(LayoutParams source) { 3552 super(source); 3553 } 3554 3555 /** 3556 * Sets the margins, in pixels. 3557 * 3558 * @param left the left margin size 3559 * @param top the top margin size 3560 * @param right the right margin size 3561 * @param bottom the bottom margin size 3562 * 3563 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 3564 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 3565 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 3566 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 3567 */ 3568 public void setMargins(int left, int top, int right, int bottom) { 3569 leftMargin = left; 3570 topMargin = top; 3571 rightMargin = right; 3572 bottomMargin = bottom; 3573 } 3574 } 3575} 3576