ViewGroup.java revision 24443ea3992e372e47daa50266b0f2ec38cac388
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.Region; 28import android.graphics.RectF; 29import android.os.Parcelable; 30import android.os.SystemClock; 31import android.util.AttributeSet; 32import android.util.EventLog; 33import android.util.Log; 34import android.util.SparseArray; 35import android.view.animation.Animation; 36import android.view.animation.AnimationUtils; 37import android.view.animation.LayoutAnimationController; 38import android.view.animation.Transformation; 39 40import java.util.ArrayList; 41 42/** 43 * <p> 44 * A <code>ViewGroup</code> is a special view that can contain other views 45 * (called children.) The view group is the base class for layouts and views 46 * containers. This class also defines the 47 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 48 * class for layouts parameters. 49 * </p> 50 * 51 * <p> 52 * Also see {@link LayoutParams} for layout attributes. 53 * </p> 54 */ 55public abstract class ViewGroup extends View implements ViewParent, ViewManager { 56 private static final boolean DBG = false; 57 58 /** 59 * Views which have been hidden or removed which need to be animated on 60 * their way out. 61 * This field should be made private, so it is hidden from the SDK. 62 * {@hide} 63 */ 64 protected ArrayList<View> mDisappearingChildren; 65 66 /** 67 * Listener used to propagate events indicating when children are added 68 * and/or removed from a view group. 69 * This field should be made private, so it is hidden from the SDK. 70 * {@hide} 71 */ 72 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 73 74 // The view contained within this ViewGroup that has or contains focus. 75 private View mFocused; 76 77 // The current transformation to apply on the child being drawn 78 private Transformation mChildTransformation; 79 private RectF mInvalidateRegion; 80 81 // Target of Motion events 82 private View mMotionTarget; 83 private final Rect mTempRect = new Rect(); 84 85 // Layout animation 86 private LayoutAnimationController mLayoutAnimationController; 87 private Animation.AnimationListener mAnimationListener; 88 89 /** 90 * Internal flags. 91 * 92 * This field should be made private, so it is hidden from the SDK. 93 * {@hide} 94 */ 95 protected int mGroupFlags; 96 97 // When set, ViewGroup invalidates only the child's rectangle 98 // Set by default 99 private static final int FLAG_CLIP_CHILDREN = 0x1; 100 101 // When set, ViewGroup excludes the padding area from the invalidate rectangle 102 // Set by default 103 private static final int FLAG_CLIP_TO_PADDING = 0x2; 104 105 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 106 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 107 private static final int FLAG_INVALIDATE_REQUIRED = 0x4; 108 109 // When set, dispatchDraw() will run the layout animation and unset the flag 110 private static final int FLAG_RUN_ANIMATION = 0x8; 111 112 // When set, there is either no layout animation on the ViewGroup or the layout 113 // animation is over 114 // Set by default 115 private static final int FLAG_ANIMATION_DONE = 0x10; 116 117 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 118 // to clip it, even if FLAG_CLIP_TO_PADDING is set 119 private static final int FLAG_PADDING_NOT_NULL = 0x20; 120 121 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 122 // Set by default 123 private static final int FLAG_ANIMATION_CACHE = 0x40; 124 125 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 126 // layout animation; this avoid clobbering the hierarchy 127 // Automatically set when the layout animation starts, depending on the animation's 128 // characteristics 129 private static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 130 131 // When set, the next call to drawChild() will clear mChildTransformation's matrix 132 private static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 133 134 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 135 // the children's Bitmap caches if necessary 136 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 137 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 138 139 /** 140 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 141 * to get the index of the child to draw for that iteration. 142 */ 143 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 144 145 /** 146 * When set, this ViewGroup supports static transformations on children; this causes 147 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 148 * invoked when a child is drawn. 149 * 150 * Any subclass overriding 151 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 152 * set this flags in {@link #mGroupFlags}. 153 * 154 * {@hide} 155 */ 156 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 157 158 // When the previous drawChild() invocation used an alpha value that was lower than 159 // 1.0 and set it in mCachePaint 160 private static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 161 162 /** 163 * When set, this ViewGroup's drawable states also include those 164 * of its children. 165 */ 166 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 167 168 /** 169 * When set, this ViewGroup tries to always draw its children using their drawing cache. 170 */ 171 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 172 173 /** 174 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 175 * draw its children with their drawing cache. 176 */ 177 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 178 179 /** 180 * When set, this group will go through its list of children to notify them of 181 * any drawable state change. 182 */ 183 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 184 185 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 186 187 /** 188 * This view will get focus before any of its descendants. 189 */ 190 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 191 192 /** 193 * This view will get focus only if none of its descendants want it. 194 */ 195 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 196 197 /** 198 * This view will block any of its descendants from getting focus, even 199 * if they are focusable. 200 */ 201 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 202 203 /** 204 * Used to map between enum in attrubutes and flag values. 205 */ 206 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 207 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 208 FOCUS_BLOCK_DESCENDANTS}; 209 210 /** 211 * When set, this ViewGroup should not intercept touch events. 212 */ 213 private static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 214 215 /** 216 * Indicates which types of drawing caches are to be kept in memory. 217 * This field should be made private, so it is hidden from the SDK. 218 * {@hide} 219 */ 220 protected int mPersistentDrawingCache; 221 222 /** 223 * Used to indicate that no drawing cache should be kept in memory. 224 */ 225 public static final int PERSISTENT_NO_CACHE = 0x0; 226 227 /** 228 * Used to indicate that the animation drawing cache should be kept in memory. 229 */ 230 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 231 232 /** 233 * Used to indicate that the scrolling drawing cache should be kept in memory. 234 */ 235 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 236 237 /** 238 * Used to indicate that all drawing caches should be kept in memory. 239 */ 240 public static final int PERSISTENT_ALL_CACHES = 0x3; 241 242 /** 243 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 244 * are set at the same time. 245 */ 246 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 247 248 // Index of the child's left position in the mLocation array 249 private static final int CHILD_LEFT_INDEX = 0; 250 // Index of the child's top position in the mLocation array 251 private static final int CHILD_TOP_INDEX = 1; 252 253 // Child views of this ViewGroup 254 private View[] mChildren; 255 // Number of valid children in the mChildren array, the rest should be null or not 256 // considered as children 257 private int mChildrenCount; 258 259 private static final int ARRAY_INITIAL_CAPACITY = 12; 260 private static final int ARRAY_CAPACITY_INCREMENT = 12; 261 262 // Used to draw cached views 263 private final Paint mCachePaint = new Paint(); 264 265 public ViewGroup(Context context) { 266 super(context); 267 initViewGroup(); 268 } 269 270 public ViewGroup(Context context, AttributeSet attrs) { 271 super(context, attrs); 272 initViewGroup(); 273 initFromAttributes(context, attrs); 274 } 275 276 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 277 super(context, attrs, defStyle); 278 initViewGroup(); 279 initFromAttributes(context, attrs); 280 } 281 282 private void initViewGroup() { 283 // ViewGroup doesn't draw by default 284 setFlags(WILL_NOT_DRAW, DRAW_MASK); 285 mGroupFlags |= FLAG_CLIP_CHILDREN; 286 mGroupFlags |= FLAG_CLIP_TO_PADDING; 287 mGroupFlags |= FLAG_ANIMATION_DONE; 288 mGroupFlags |= FLAG_ANIMATION_CACHE; 289 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 290 291 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 292 293 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 294 mChildrenCount = 0; 295 296 mCachePaint.setDither(false); 297 298 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 299 } 300 301 private void initFromAttributes(Context context, AttributeSet attrs) { 302 TypedArray a = context.obtainStyledAttributes(attrs, 303 R.styleable.ViewGroup); 304 305 final int N = a.getIndexCount(); 306 for (int i = 0; i < N; i++) { 307 int attr = a.getIndex(i); 308 switch (attr) { 309 case R.styleable.ViewGroup_clipChildren: 310 setClipChildren(a.getBoolean(attr, true)); 311 break; 312 case R.styleable.ViewGroup_clipToPadding: 313 setClipToPadding(a.getBoolean(attr, true)); 314 break; 315 case R.styleable.ViewGroup_animationCache: 316 setAnimationCacheEnabled(a.getBoolean(attr, true)); 317 break; 318 case R.styleable.ViewGroup_persistentDrawingCache: 319 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 320 break; 321 case R.styleable.ViewGroup_addStatesFromChildren: 322 setAddStatesFromChildren(a.getBoolean(attr, false)); 323 break; 324 case R.styleable.ViewGroup_alwaysDrawnWithCache: 325 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 326 break; 327 case R.styleable.ViewGroup_layoutAnimation: 328 int id = a.getResourceId(attr, -1); 329 if (id > 0) { 330 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 331 } 332 break; 333 case R.styleable.ViewGroup_descendantFocusability: 334 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 335 break; 336 } 337 } 338 339 a.recycle(); 340 } 341 342 /** 343 * Gets the descendant focusability of this view group. The descendant 344 * focusability defines the relationship between this view group and its 345 * descendants when looking for a view to take focus in 346 * {@link #requestFocus(int, android.graphics.Rect)}. 347 * 348 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 349 * {@link #FOCUS_BLOCK_DESCENDANTS}. 350 */ 351 @ViewDebug.ExportedProperty(mapping = { 352 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 353 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 354 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 355 }) 356 public int getDescendantFocusability() { 357 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 358 } 359 360 /** 361 * Set the descendant focusability of this view group. This defines the relationship 362 * between this view group and its descendants when looking for a view to 363 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 364 * 365 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 366 * {@link #FOCUS_BLOCK_DESCENDANTS}. 367 */ 368 public void setDescendantFocusability(int focusability) { 369 switch (focusability) { 370 case FOCUS_BEFORE_DESCENDANTS: 371 case FOCUS_AFTER_DESCENDANTS: 372 case FOCUS_BLOCK_DESCENDANTS: 373 break; 374 default: 375 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 376 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 377 } 378 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 379 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 380 } 381 382 /** 383 * {@inheritDoc} 384 */ 385 @Override 386 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 387 if (mFocused != null) { 388 mFocused.unFocus(); 389 mFocused = null; 390 } 391 super.handleFocusGainInternal(direction, previouslyFocusedRect); 392 } 393 394 /** 395 * {@inheritDoc} 396 */ 397 public void requestChildFocus(View child, View focused) { 398 if (DBG) { 399 System.out.println(this + " requestChildFocus()"); 400 } 401 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 402 return; 403 } 404 405 // Unfocus us, if necessary 406 super.unFocus(); 407 408 // We had a previous notion of who had focus. Clear it. 409 if (mFocused != child) { 410 if (mFocused != null) { 411 mFocused.unFocus(); 412 } 413 414 mFocused = child; 415 } 416 if (mParent != null) { 417 mParent.requestChildFocus(this, focused); 418 } 419 } 420 421 /** 422 * {@inheritDoc} 423 */ 424 public void focusableViewAvailable(View v) { 425 if (mParent != null 426 // shortcut: don't report a new focusable view if we block our descendants from 427 // getting focus 428 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 429 // shortcut: don't report a new focusable view if we already are focused 430 // (and we don't prefer our descendants) 431 // 432 // note: knowing that mFocused is non-null is not a good enough reason 433 // to break the traversal since in that case we'd actually have to find 434 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 435 // an ancestor of v; this will get checked for at ViewRoot 436 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 437 mParent.focusableViewAvailable(v); 438 } 439 } 440 441 /** 442 * {@inheritDoc} 443 */ 444 public boolean showContextMenuForChild(View originalView) { 445 return mParent != null && mParent.showContextMenuForChild(originalView); 446 } 447 448 /** 449 * Find the nearest view in the specified direction that wants to take 450 * focus. 451 * 452 * @param focused The view that currently has focus 453 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 454 * FOCUS_RIGHT, or 0 for not applicable. 455 */ 456 public View focusSearch(View focused, int direction) { 457 if (isRootNamespace()) { 458 // root namespace means we should consider ourselves the top of the 459 // tree for focus searching; otherwise we could be focus searching 460 // into other tabs. see LocalActivityManager and TabHost for more info 461 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 462 } else if (mParent != null) { 463 return mParent.focusSearch(focused, direction); 464 } 465 return null; 466 } 467 468 /** 469 * {@inheritDoc} 470 */ 471 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 472 return false; 473 } 474 475 /** 476 * {@inheritDoc} 477 */ 478 @Override 479 public boolean dispatchUnhandledMove(View focused, int direction) { 480 return mFocused != null && 481 mFocused.dispatchUnhandledMove(focused, direction); 482 } 483 484 /** 485 * {@inheritDoc} 486 */ 487 public void clearChildFocus(View child) { 488 if (DBG) { 489 System.out.println(this + " clearChildFocus()"); 490 } 491 492 mFocused = null; 493 if (mParent != null) { 494 mParent.clearChildFocus(this); 495 } 496 } 497 498 /** 499 * {@inheritDoc} 500 */ 501 @Override 502 public void clearFocus() { 503 super.clearFocus(); 504 505 // clear any child focus if it exists 506 if (mFocused != null) { 507 mFocused.clearFocus(); 508 } 509 } 510 511 /** 512 * {@inheritDoc} 513 */ 514 @Override 515 void unFocus() { 516 if (DBG) { 517 System.out.println(this + " unFocus()"); 518 } 519 520 super.unFocus(); 521 if (mFocused != null) { 522 mFocused.unFocus(); 523 } 524 mFocused = null; 525 } 526 527 /** 528 * Returns the focused child of this view, if any. The child may have focus 529 * or contain focus. 530 * 531 * @return the focused child or null. 532 */ 533 public View getFocusedChild() { 534 return mFocused; 535 } 536 537 /** 538 * Returns true if this view has or contains focus 539 * 540 * @return true if this view has or contains focus 541 */ 542 @Override 543 public boolean hasFocus() { 544 return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; 545 } 546 547 /* 548 * (non-Javadoc) 549 * 550 * @see android.view.View#findFocus() 551 */ 552 @Override 553 public View findFocus() { 554 if (DBG) { 555 System.out.println("Find focus in " + this + ": flags=" 556 + isFocused() + ", child=" + mFocused); 557 } 558 559 if (isFocused()) { 560 return this; 561 } 562 563 if (mFocused != null) { 564 return mFocused.findFocus(); 565 } 566 return null; 567 } 568 569 /** 570 * {@inheritDoc} 571 */ 572 @Override 573 public boolean hasFocusable() { 574 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 575 return false; 576 } 577 578 if (isFocusable()) { 579 return true; 580 } 581 582 final int descendantFocusability = getDescendantFocusability(); 583 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 584 final int count = mChildrenCount; 585 final View[] children = mChildren; 586 587 for (int i = 0; i < count; i++) { 588 final View child = children[i]; 589 if (child.hasFocusable()) { 590 return true; 591 } 592 } 593 } 594 595 return false; 596 } 597 598 /** 599 * {@inheritDoc} 600 */ 601 @Override 602 public void addFocusables(ArrayList<View> views, int direction) { 603 final int focusableCount = views.size(); 604 605 final int descendantFocusability = getDescendantFocusability(); 606 607 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 608 final int count = mChildrenCount; 609 final View[] children = mChildren; 610 611 for (int i = 0; i < count; i++) { 612 final View child = children[i]; 613 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 614 child.addFocusables(views, direction); 615 } 616 } 617 } 618 619 // we add ourselves (if focusable) in all cases except for when we are 620 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 621 // to avoid the focus search finding layouts when a more precise search 622 // among the focusable children would be more interesting. 623 if ( 624 descendantFocusability != FOCUS_AFTER_DESCENDANTS || 625 // No focusable descendants 626 (focusableCount == views.size())) { 627 super.addFocusables(views, direction); 628 } 629 } 630 631 /** 632 * {@inheritDoc} 633 */ 634 @Override 635 public void dispatchWindowFocusChanged(boolean hasFocus) { 636 super.dispatchWindowFocusChanged(hasFocus); 637 final int count = mChildrenCount; 638 final View[] children = mChildren; 639 for (int i = 0; i < count; i++) { 640 children[i].dispatchWindowFocusChanged(hasFocus); 641 } 642 } 643 644 /** 645 * {@inheritDoc} 646 */ 647 @Override 648 public void addTouchables(ArrayList<View> views) { 649 super.addTouchables(views); 650 651 final int count = mChildrenCount; 652 final View[] children = mChildren; 653 654 for (int i = 0; i < count; i++) { 655 final View child = children[i]; 656 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 657 child.addTouchables(views); 658 } 659 } 660 } 661 662 /** 663 * {@inheritDoc} 664 */ 665 @Override 666 public void dispatchWindowVisibilityChanged(int visibility) { 667 super.dispatchWindowVisibilityChanged(visibility); 668 final int count = mChildrenCount; 669 final View[] children = mChildren; 670 for (int i = 0; i < count; i++) { 671 children[i].dispatchWindowVisibilityChanged(visibility); 672 } 673 } 674 675 /** 676 * {@inheritDoc} 677 */ 678 public void recomputeViewAttributes(View child) { 679 ViewParent parent = mParent; 680 if (parent != null) parent.recomputeViewAttributes(this); 681 } 682 683 @Override 684 void dispatchCollectViewAttributes(int visibility) { 685 visibility |= mViewFlags&VISIBILITY_MASK; 686 super.dispatchCollectViewAttributes(visibility); 687 final int count = mChildrenCount; 688 final View[] children = mChildren; 689 for (int i = 0; i < count; i++) { 690 children[i].dispatchCollectViewAttributes(visibility); 691 } 692 } 693 694 /** 695 * {@inheritDoc} 696 */ 697 public void bringChildToFront(View child) { 698 int index = indexOfChild(child); 699 if (index >= 0) { 700 removeFromArray(index); 701 addInArray(child, mChildrenCount); 702 child.mParent = this; 703 } 704 } 705 706 /** 707 * {@inheritDoc} 708 */ 709 @Override 710 public boolean dispatchKeyEventPreIme(KeyEvent event) { 711 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 712 return super.dispatchKeyEventPreIme(event); 713 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 714 return mFocused.dispatchKeyEventPreIme(event); 715 } 716 return false; 717 } 718 719 /** 720 * {@inheritDoc} 721 */ 722 @Override 723 public boolean dispatchKeyEvent(KeyEvent event) { 724 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 725 return super.dispatchKeyEvent(event); 726 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 727 return mFocused.dispatchKeyEvent(event); 728 } 729 return false; 730 } 731 732 /** 733 * {@inheritDoc} 734 */ 735 @Override 736 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 737 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 738 return super.dispatchKeyShortcutEvent(event); 739 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 740 return mFocused.dispatchKeyShortcutEvent(event); 741 } 742 return false; 743 } 744 745 /** 746 * {@inheritDoc} 747 */ 748 @Override 749 public boolean dispatchTrackballEvent(MotionEvent event) { 750 if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { 751 return super.dispatchTrackballEvent(event); 752 } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 753 return mFocused.dispatchTrackballEvent(event); 754 } 755 return false; 756 } 757 758 /** 759 * {@inheritDoc} 760 */ 761 @Override 762 public boolean dispatchTouchEvent(MotionEvent ev) { 763 final int action = ev.getAction(); 764 final float xf = ev.getX(); 765 final float yf = ev.getY(); 766 final float scrolledXFloat = xf + mScrollX; 767 final float scrolledYFloat = yf + mScrollY; 768 final Rect frame = mTempRect; 769 770 boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 771 772 if (action == MotionEvent.ACTION_DOWN) { 773 if (mMotionTarget != null) { 774 // this is weird, we got a pen down, but we thought it was 775 // already down! 776 // XXX: We should probably send an ACTION_UP to the current 777 // target. 778 mMotionTarget = null; 779 } 780 // If we're disallowing intercept or if we're allowing and we didn't 781 // intercept 782 if (disallowIntercept || !onInterceptTouchEvent(ev)) { 783 // reset this event's action (just to protect ourselves) 784 ev.setAction(MotionEvent.ACTION_DOWN); 785 // We know we want to dispatch the event down, find a child 786 // who can handle it, start with the front-most child. 787 final int scrolledXInt = (int) scrolledXFloat; 788 final int scrolledYInt = (int) scrolledYFloat; 789 final View[] children = mChildren; 790 final int count = mChildrenCount; 791 for (int i = count - 1; i >= 0; i--) { 792 final View child = children[i]; 793 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 794 || child.getAnimation() != null) { 795 child.getHitRect(frame); 796 if (frame.contains(scrolledXInt, scrolledYInt)) { 797 // offset the event to the view's coordinate system 798 final float xc = scrolledXFloat - child.mLeft; 799 final float yc = scrolledYFloat - child.mTop; 800 ev.setLocation(xc, yc); 801 if (child.dispatchTouchEvent(ev)) { 802 // Event handled, we have a target now. 803 mMotionTarget = child; 804 return true; 805 } 806 // The event didn't get handled, try the next view. 807 // Don't reset the event's location, it's not 808 // necessary here. 809 } 810 } 811 } 812 } 813 } 814 815 boolean isUpOrCancel = (action == MotionEvent.ACTION_UP) || 816 (action == MotionEvent.ACTION_CANCEL); 817 818 if (isUpOrCancel) { 819 // Note, we've already copied the previous state to our local 820 // variable, so this takes effect on the next event 821 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 822 } 823 824 // The event wasn't an ACTION_DOWN, dispatch it to our target if 825 // we have one. 826 final View target = mMotionTarget; 827 if (target == null) { 828 // We don't have a target, this means we're handling the 829 // event as a regular view. 830 ev.setLocation(xf, yf); 831 return super.dispatchTouchEvent(ev); 832 } 833 834 // if have a target, see if we're allowed to and want to intercept its 835 // events 836 if (!disallowIntercept && onInterceptTouchEvent(ev)) { 837 final float xc = scrolledXFloat - (float) target.mLeft; 838 final float yc = scrolledYFloat - (float) target.mTop; 839 ev.setAction(MotionEvent.ACTION_CANCEL); 840 ev.setLocation(xc, yc); 841 if (!target.dispatchTouchEvent(ev)) { 842 // target didn't handle ACTION_CANCEL. not much we can do 843 // but they should have. 844 } 845 // clear the target 846 mMotionTarget = null; 847 // Don't dispatch this event to our own view, because we already 848 // saw it when intercepting; we just want to give the following 849 // event to the normal onTouchEvent(). 850 return true; 851 } 852 853 if (isUpOrCancel) { 854 mMotionTarget = null; 855 } 856 857 // finally offset the event to the target's coordinate system and 858 // dispatch the event. 859 final float xc = scrolledXFloat - (float) target.mLeft; 860 final float yc = scrolledYFloat - (float) target.mTop; 861 ev.setLocation(xc, yc); 862 863 return target.dispatchTouchEvent(ev); 864 } 865 866 /** 867 * {@inheritDoc} 868 */ 869 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 870 871 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 872 // We're already in this state, assume our ancestors are too 873 return; 874 } 875 876 if (disallowIntercept) { 877 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 878 } else { 879 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 880 } 881 882 // Pass it up to our parent 883 if (mParent != null) { 884 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 885 } 886 } 887 888 /** 889 * Implement this method to intercept all touch screen motion events. This 890 * allows you to watch events as they are dispatched to your children, and 891 * take ownership of the current gesture at any point. 892 * 893 * <p>Using this function takes some care, as it has a fairly complicated 894 * interaction with {@link View#onTouchEvent(MotionEvent) 895 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 896 * that method as well as this one in the correct way. Events will be 897 * received in the following order: 898 * 899 * <ol> 900 * <li> You will receive the down event here. 901 * <li> The down event will be handled either by a child of this view 902 * group, or given to your own onTouchEvent() method to handle; this means 903 * you should implement onTouchEvent() to return true, so you will 904 * continue to see the rest of the gesture (instead of looking for 905 * a parent view to handle it). Also, by returning true from 906 * onTouchEvent(), you will not receive any following 907 * events in onInterceptTouchEvent() and all touch processing must 908 * happen in onTouchEvent() like normal. 909 * <li> For as long as you return false from this function, each following 910 * event (up to and including the final up) will be delivered first here 911 * and then to the target's onTouchEvent(). 912 * <li> If you return true from here, you will not receive any 913 * following events: the target view will receive the same event but 914 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 915 * events will be delivered to your onTouchEvent() method and no longer 916 * appear here. 917 * </ol> 918 * 919 * @param ev The motion event being dispatched down the hierarchy. 920 * @return Return true to steal motion events from the children and have 921 * them dispatched to this ViewGroup through onTouchEvent(). 922 * The current target will receive an ACTION_CANCEL event, and no further 923 * messages will be delivered here. 924 */ 925 public boolean onInterceptTouchEvent(MotionEvent ev) { 926 return false; 927 } 928 929 /** 930 * {@inheritDoc} 931 * 932 * Looks for a view to give focus to respecting the setting specified by 933 * {@link #getDescendantFocusability()}. 934 * 935 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 936 * find focus within the children of this group when appropriate. 937 * 938 * @see #FOCUS_BEFORE_DESCENDANTS 939 * @see #FOCUS_AFTER_DESCENDANTS 940 * @see #FOCUS_BLOCK_DESCENDANTS 941 * @see #onRequestFocusInDescendants 942 */ 943 @Override 944 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 945 if (DBG) { 946 System.out.println(this + " ViewGroup.requestFocus direction=" 947 + direction); 948 } 949 int descendantFocusability = getDescendantFocusability(); 950 951 switch (descendantFocusability) { 952 case FOCUS_BLOCK_DESCENDANTS: 953 return super.requestFocus(direction, previouslyFocusedRect); 954 case FOCUS_BEFORE_DESCENDANTS: { 955 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 956 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 957 } 958 case FOCUS_AFTER_DESCENDANTS: { 959 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 960 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 961 } 962 default: 963 throw new IllegalStateException("descendant focusability must be " 964 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 965 + "but is " + descendantFocusability); 966 } 967 } 968 969 /** 970 * Look for a descendant to call {@link View#requestFocus} on. 971 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 972 * when it wants to request focus within its children. Override this to 973 * customize how your {@link ViewGroup} requests focus within its children. 974 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 975 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 976 * to give a finer grained hint about where focus is coming from. May be null 977 * if there is no hint. 978 * @return Whether focus was taken. 979 */ 980 @SuppressWarnings({"ConstantConditions"}) 981 protected boolean onRequestFocusInDescendants(int direction, 982 Rect previouslyFocusedRect) { 983 int index; 984 int increment; 985 int end; 986 int count = mChildrenCount; 987 if ((direction & FOCUS_FORWARD) != 0) { 988 index = 0; 989 increment = 1; 990 end = count; 991 } else { 992 index = count - 1; 993 increment = -1; 994 end = -1; 995 } 996 final View[] children = mChildren; 997 for (int i = index; i != end; i += increment) { 998 View child = children[i]; 999 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1000 if (child.requestFocus(direction, previouslyFocusedRect)) { 1001 return true; 1002 } 1003 } 1004 } 1005 return false; 1006 } 1007 1008 /** 1009 * {@inheritDoc} 1010 */ 1011 @Override 1012 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 1013 super.dispatchAttachedToWindow(info, visibility); 1014 visibility |= mViewFlags & VISIBILITY_MASK; 1015 final int count = mChildrenCount; 1016 final View[] children = mChildren; 1017 for (int i = 0; i < count; i++) { 1018 children[i].dispatchAttachedToWindow(info, visibility); 1019 } 1020 } 1021 1022 /** 1023 * {@inheritDoc} 1024 */ 1025 @Override 1026 void dispatchDetachedFromWindow() { 1027 // If we still have a motion target, we are still in the process of 1028 // dispatching motion events to a child; we need to get rid of that 1029 // child to avoid dispatching events to it after the window is torn 1030 // down. To make sure we keep the child in a consistent state, we 1031 // first send it an ACTION_CANCEL motion event. 1032 if (mMotionTarget != null) { 1033 final long now = SystemClock.uptimeMillis(); 1034 final MotionEvent event = MotionEvent.obtain(now, now, 1035 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 1036 mMotionTarget.dispatchTouchEvent(event); 1037 event.recycle(); 1038 mMotionTarget = null; 1039 } 1040 1041 final int count = mChildrenCount; 1042 final View[] children = mChildren; 1043 for (int i = 0; i < count; i++) { 1044 children[i].dispatchDetachedFromWindow(); 1045 } 1046 super.dispatchDetachedFromWindow(); 1047 } 1048 1049 /** 1050 * {@inheritDoc} 1051 */ 1052 @Override 1053 public void setPadding(int left, int top, int right, int bottom) { 1054 super.setPadding(left, top, right, bottom); 1055 1056 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingRight) != 0) { 1057 mGroupFlags |= FLAG_PADDING_NOT_NULL; 1058 } else { 1059 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 1060 } 1061 } 1062 1063 /** 1064 * {@inheritDoc} 1065 */ 1066 @Override 1067 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 1068 super.dispatchSaveInstanceState(container); 1069 final int count = mChildrenCount; 1070 final View[] children = mChildren; 1071 for (int i = 0; i < count; i++) { 1072 children[i].dispatchSaveInstanceState(container); 1073 } 1074 } 1075 1076 /** 1077 * Perform dispatching of a {@link #saveHierarchyState freeze()} to only this view, 1078 * not to its children. For use when overriding 1079 * {@link #dispatchSaveInstanceState dispatchFreeze()} to allow subclasses to freeze 1080 * their own state but not the state of their children. 1081 * 1082 * @param container the container 1083 */ 1084 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 1085 super.dispatchSaveInstanceState(container); 1086 } 1087 1088 /** 1089 * {@inheritDoc} 1090 */ 1091 @Override 1092 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 1093 super.dispatchRestoreInstanceState(container); 1094 final int count = mChildrenCount; 1095 final View[] children = mChildren; 1096 for (int i = 0; i < count; i++) { 1097 children[i].dispatchRestoreInstanceState(container); 1098 } 1099 } 1100 1101 /** 1102 * Perform dispatching of a {@link #restoreHierarchyState thaw()} to only this view, 1103 * not to its children. For use when overriding 1104 * {@link #dispatchRestoreInstanceState dispatchThaw()} to allow subclasses to thaw 1105 * their own state but not the state of their children. 1106 * 1107 * @param container the container 1108 */ 1109 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 1110 super.dispatchRestoreInstanceState(container); 1111 } 1112 1113 /** 1114 * Enables or disables the drawing cache for each child of this view group. 1115 * 1116 * @param enabled true to enable the cache, false to dispose of it 1117 */ 1118 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 1119 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 1120 final View[] children = mChildren; 1121 final int count = mChildrenCount; 1122 for (int i = 0; i < count; i++) { 1123 children[i].setDrawingCacheEnabled(enabled); 1124 } 1125 } 1126 } 1127 1128 @Override 1129 protected void onAnimationStart() { 1130 super.onAnimationStart(); 1131 1132 // When this ViewGroup's animation starts, build the cache for the children 1133 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1134 final int count = mChildrenCount; 1135 final View[] children = mChildren; 1136 1137 for (int i = 0; i < count; i++) { 1138 final View child = children[i]; 1139 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1140 child.setDrawingCacheEnabled(true); 1141 child.buildDrawingCache(); 1142 } 1143 } 1144 1145 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1146 } 1147 } 1148 1149 @Override 1150 protected void onAnimationEnd() { 1151 super.onAnimationEnd(); 1152 1153 // When this ViewGroup's animation ends, destroy the cache of the children 1154 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1155 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1156 1157 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1158 setChildrenDrawingCacheEnabled(false); 1159 } 1160 } 1161 } 1162 1163 /** 1164 * {@inheritDoc} 1165 */ 1166 @Override 1167 protected void dispatchDraw(Canvas canvas) { 1168 final int count = mChildrenCount; 1169 final View[] children = mChildren; 1170 int flags = mGroupFlags; 1171 1172 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 1173 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 1174 1175 for (int i = 0; i < count; i++) { 1176 final View child = children[i]; 1177 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1178 final LayoutParams params = child.getLayoutParams(); 1179 attachLayoutAnimationParameters(child, params, i, count); 1180 bindLayoutAnimation(child); 1181 if (cache) { 1182 child.setDrawingCacheEnabled(true); 1183 child.buildDrawingCache(); 1184 } 1185 } 1186 } 1187 1188 final LayoutAnimationController controller = mLayoutAnimationController; 1189 if (controller.willOverlap()) { 1190 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 1191 } 1192 1193 controller.start(); 1194 1195 mGroupFlags &= ~FLAG_RUN_ANIMATION; 1196 mGroupFlags &= ~FLAG_ANIMATION_DONE; 1197 1198 if (cache) { 1199 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 1200 } 1201 1202 if (mAnimationListener != null) { 1203 mAnimationListener.onAnimationStart(controller.getAnimation()); 1204 } 1205 } 1206 1207 int saveCount = 0; 1208 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 1209 if (clipToPadding) { 1210 saveCount = canvas.save(); 1211 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 1212 mScrollX + mRight - mLeft - mPaddingRight, 1213 mScrollY + mBottom - mTop - mPaddingBottom); 1214 1215 } 1216 1217 // We will draw our child's animation, let's reset the flag 1218 mPrivateFlags &= ~DRAW_ANIMATION; 1219 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 1220 1221 boolean more = false; 1222 final long drawingTime = getDrawingTime(); 1223 1224 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 1225 for (int i = 0; i < count; i++) { 1226 final View child = children[i]; 1227 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1228 more |= drawChild(canvas, child, drawingTime); 1229 } 1230 } 1231 } else { 1232 for (int i = 0; i < count; i++) { 1233 final View child = children[getChildDrawingOrder(count, i)]; 1234 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 1235 more |= drawChild(canvas, child, drawingTime); 1236 } 1237 } 1238 } 1239 1240 // Draw any disappearing views that have animations 1241 if (mDisappearingChildren != null) { 1242 final ArrayList<View> disappearingChildren = mDisappearingChildren; 1243 final int disappearingCount = disappearingChildren.size() - 1; 1244 // Go backwards -- we may delete as animations finish 1245 for (int i = disappearingCount; i >= 0; i--) { 1246 final View child = disappearingChildren.get(i); 1247 more |= drawChild(canvas, child, drawingTime); 1248 } 1249 } 1250 1251 if (clipToPadding) { 1252 canvas.restoreToCount(saveCount); 1253 } 1254 1255 // mGroupFlags might have been updated by drawChild() 1256 flags = mGroupFlags; 1257 1258 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 1259 invalidate(); 1260 } 1261 1262 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 1263 mLayoutAnimationController.isDone() && !more) { 1264 // We want to erase the drawing cache and notify the listener after the 1265 // next frame is drawn because one extra invalidate() is caused by 1266 // drawChild() after the animation is over 1267 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 1268 final Runnable end = new Runnable() { 1269 public void run() { 1270 notifyAnimationListener(); 1271 } 1272 }; 1273 post(end); 1274 } 1275 } 1276 1277 /** 1278 * Returns the index of the child to draw for this iteration. Override this 1279 * if you want to change the drawing order of children. By default, it 1280 * returns i. 1281 * <p> 1282 * NOTE: In order for this method to be called, the 1283 * {@link #FLAG_USE_CHILD_DRAWING_ORDER} must be set. 1284 * 1285 * @param i The current iteration. 1286 * @return The index of the child to draw this iteration. 1287 */ 1288 protected int getChildDrawingOrder(int childCount, int i) { 1289 return i; 1290 } 1291 1292 private void notifyAnimationListener() { 1293 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 1294 mGroupFlags |= FLAG_ANIMATION_DONE; 1295 1296 if (mAnimationListener != null) { 1297 final Runnable end = new Runnable() { 1298 public void run() { 1299 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 1300 } 1301 }; 1302 post(end); 1303 } 1304 1305 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 1306 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 1307 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 1308 setChildrenDrawingCacheEnabled(false); 1309 } 1310 } 1311 1312 invalidate(); 1313 } 1314 1315 /** 1316 * Draw one child of this View Group. This method is responsible for getting 1317 * the canvas in the right state. This includes clipping, translating so 1318 * that the child's scrolled origin is at 0, 0, and applying any animation 1319 * transformations. 1320 * 1321 * @param canvas The canvas on which to draw the child 1322 * @param child Who to draw 1323 * @param drawingTime The time at which draw is occuring 1324 * @return True if an invalidate() was issued 1325 */ 1326 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 1327 boolean more = false; 1328 1329 final int cl = child.mLeft; 1330 final int ct = child.mTop; 1331 final int cr = child.mRight; 1332 final int cb = child.mBottom; 1333 1334 final int flags = mGroupFlags; 1335 1336 if ((flags & FLAG_CLEAR_TRANSFORMATION) == FLAG_CLEAR_TRANSFORMATION) { 1337 if (mChildTransformation != null) { 1338 mChildTransformation.clear(); 1339 } 1340 mGroupFlags &= ~FLAG_CLEAR_TRANSFORMATION; 1341 } 1342 1343 Transformation transformToApply = null; 1344 final Animation a = child.getAnimation(); 1345 boolean concatMatrix = false; 1346 1347 if (a != null) { 1348 if (mInvalidateRegion == null) { 1349 mInvalidateRegion = new RectF(); 1350 } 1351 final RectF region = mInvalidateRegion; 1352 1353 final boolean initialized = a.isInitialized(); 1354 if (!initialized) { 1355 a.initialize(cr - cl, cb - ct, getWidth(), getHeight()); 1356 a.initializeInvalidateRegion(0, 0, cr - cl, cb - ct); 1357 child.onAnimationStart(); 1358 } 1359 1360 if (mChildTransformation == null) { 1361 mChildTransformation = new Transformation(); 1362 } 1363 more = a.getTransformation(drawingTime, mChildTransformation); 1364 transformToApply = mChildTransformation; 1365 1366 concatMatrix = a.willChangeTransformationMatrix(); 1367 1368 if (more) { 1369 if (!a.willChangeBounds()) { 1370 if ((flags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) == 1371 FLAG_OPTIMIZE_INVALIDATE) { 1372 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 1373 } else if ((flags & FLAG_INVALIDATE_REQUIRED) == 0) { 1374 // The child need to draw an animation, potentially offscreen, so 1375 // make sure we do not cancel invalidate requests 1376 mPrivateFlags |= DRAW_ANIMATION; 1377 invalidate(cl, ct, cr, cb); 1378 } 1379 } else { 1380 a.getInvalidateRegion(0, 0, cr - cl, cb - ct, region, transformToApply); 1381 1382 // The child need to draw an animation, potentially offscreen, so 1383 // make sure we do not cancel invalidate requests 1384 mPrivateFlags |= DRAW_ANIMATION; 1385 1386 final int left = cl + (int) region.left; 1387 final int top = ct + (int) region.top; 1388 invalidate(left, top, left + (int) region.width(), top + (int) region.height()); 1389 } 1390 } 1391 } else if ((flags & FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 1392 FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 1393 if (mChildTransformation == null) { 1394 mChildTransformation = new Transformation(); 1395 } 1396 final boolean hasTransform = getChildStaticTransformation(child, mChildTransformation); 1397 if (hasTransform) { 1398 final int transformType = mChildTransformation.getTransformationType(); 1399 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 1400 mChildTransformation : null; 1401 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 1402 } 1403 } 1404 1405 // Clear the flag as early as possible to allow draw() implementations 1406 // to call invalidate() successfully when doing animations 1407 child.mPrivateFlags |= DRAWN; 1408 1409 if (!concatMatrix && canvas.quickReject(cl, ct, cr, cb, Canvas.EdgeType.BW) && 1410 (child.mPrivateFlags & DRAW_ANIMATION) == 0) { 1411 return more; 1412 } 1413 1414 child.computeScroll(); 1415 1416 final int sx = child.mScrollX; 1417 final int sy = child.mScrollY; 1418 1419 Bitmap cache = null; 1420 if ((flags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE || 1421 (flags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE) { 1422 cache = child.getDrawingCache(); 1423 } 1424 1425 final boolean hasNoCache = cache == null; 1426 1427 final int restoreTo = canvas.save(); 1428 if (hasNoCache) { 1429 canvas.translate(cl - sx, ct - sy); 1430 } else { 1431 canvas.translate(cl, ct); 1432 } 1433 1434 float alpha = 1.0f; 1435 1436 if (transformToApply != null) { 1437 if (concatMatrix) { 1438 int transX = 0; 1439 int transY = 0; 1440 if (hasNoCache) { 1441 transX = -sx; 1442 transY = -sy; 1443 } 1444 // Undo the scroll translation, apply the transformation matrix, 1445 // then redo the scroll translate to get the correct result. 1446 canvas.translate(-transX, -transY); 1447 canvas.concat(transformToApply.getMatrix()); 1448 canvas.translate(transX, transY); 1449 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1450 } 1451 1452 alpha = transformToApply.getAlpha(); 1453 if (alpha < 1.0f) { 1454 mGroupFlags |= FLAG_CLEAR_TRANSFORMATION; 1455 } 1456 1457 if (alpha < 1.0f && hasNoCache) { 1458 final int multipliedAlpha = (int) (255 * alpha); 1459 if (!child.onSetAlpha(multipliedAlpha)) { 1460 canvas.saveLayerAlpha(sx, sy, sx + cr - cl, sy + cb - ct, multipliedAlpha, 1461 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 1462 } else { 1463 child.mPrivateFlags |= ALPHA_SET; 1464 } 1465 } 1466 } else if ((child.mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 1467 child.onSetAlpha(255); 1468 } 1469 1470 if ((flags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 1471 if (hasNoCache) { 1472 canvas.clipRect(sx, sy, sx + (cr - cl), sy + (cb - ct)); 1473 } else { 1474 canvas.clipRect(0, 0, cr - cl, cb - ct); 1475 } 1476 } 1477 1478 if (hasNoCache) { 1479 // Fast path for layouts with no backgrounds 1480 if ((child.mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 1481 if (ViewDebug.TRACE_HIERARCHY) { 1482 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 1483 } 1484 child.dispatchDraw(canvas); 1485 } else { 1486 child.draw(canvas); 1487 } 1488 } else { 1489 final Paint cachePaint = mCachePaint; 1490 if (alpha < 1.0f) { 1491 cachePaint.setAlpha((int) (alpha * 255)); 1492 mGroupFlags |= FLAG_ALPHA_LOWER_THAN_ONE; 1493 } else if ((flags & FLAG_ALPHA_LOWER_THAN_ONE) == FLAG_ALPHA_LOWER_THAN_ONE) { 1494 cachePaint.setAlpha(255); 1495 mGroupFlags &= ~FLAG_ALPHA_LOWER_THAN_ONE; 1496 } 1497 if (ViewRoot.PROFILE_DRAWING) { 1498 EventLog.writeEvent(60003, hashCode()); 1499 } 1500 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 1501 } 1502 1503 canvas.restoreToCount(restoreTo); 1504 1505 if (a != null && !more) { 1506 child.onSetAlpha(255); 1507 finishAnimatingView(child, a); 1508 } 1509 1510 return more; 1511 } 1512 1513 /** 1514 * By default, children are clipped to their bounds before drawing. This 1515 * allows view groups to override this behavior for animations, etc. 1516 * 1517 * @param clipChildren true to clip children to their bounds, 1518 * false otherwise 1519 * @attr ref android.R.styleable#ViewGroup_clipChildren 1520 */ 1521 public void setClipChildren(boolean clipChildren) { 1522 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 1523 } 1524 1525 /** 1526 * By default, children are clipped to the padding of the ViewGroup. This 1527 * allows view groups to override this behavior 1528 * 1529 * @param clipToPadding true to clip children to the padding of the 1530 * group, false otherwise 1531 * @attr ref android.R.styleable#ViewGroup_clipToPadding 1532 */ 1533 public void setClipToPadding(boolean clipToPadding) { 1534 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 1535 } 1536 1537 /** 1538 * {@inheritDoc} 1539 */ 1540 @Override 1541 public void dispatchSetSelected(boolean selected) { 1542 final View[] children = mChildren; 1543 final int count = mChildrenCount; 1544 for (int i = 0; i < count; i++) { 1545 children[i].setSelected(selected); 1546 } 1547 } 1548 1549 @Override 1550 protected void dispatchSetPressed(boolean pressed) { 1551 final View[] children = mChildren; 1552 final int count = mChildrenCount; 1553 for (int i = 0; i < count; i++) { 1554 children[i].setPressed(pressed); 1555 } 1556 } 1557 1558 /** 1559 * When this property is set to true, this ViewGroup supports static transformations on 1560 * children; this causes 1561 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 1562 * invoked when a child is drawn. 1563 * 1564 * Any subclass overriding 1565 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 1566 * set this property to true. 1567 * 1568 * @param enabled True to enable static transformations on children, false otherwise. 1569 * 1570 * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS 1571 */ 1572 protected void setStaticTransformationsEnabled(boolean enabled) { 1573 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 1574 } 1575 1576 /** 1577 * {@inheritDoc} 1578 * 1579 * @see #setStaticTransformationsEnabled(boolean) 1580 */ 1581 protected boolean getChildStaticTransformation(View child, Transformation t) { 1582 return false; 1583 } 1584 1585 /** 1586 * {@hide} 1587 */ 1588 @Override 1589 protected View findViewTraversal(int id) { 1590 if (id == mID) { 1591 return this; 1592 } 1593 1594 final View[] where = mChildren; 1595 final int len = mChildrenCount; 1596 1597 for (int i = 0; i < len; i++) { 1598 View v = where[i]; 1599 1600 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1601 v = v.findViewById(id); 1602 1603 if (v != null) { 1604 return v; 1605 } 1606 } 1607 } 1608 1609 return null; 1610 } 1611 1612 /** 1613 * {@hide} 1614 */ 1615 @Override 1616 protected View findViewWithTagTraversal(Object tag) { 1617 if (tag != null && tag.equals(mTag)) { 1618 return this; 1619 } 1620 1621 final View[] where = mChildren; 1622 final int len = mChildrenCount; 1623 1624 for (int i = 0; i < len; i++) { 1625 View v = where[i]; 1626 1627 if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 1628 v = v.findViewWithTag(tag); 1629 1630 if (v != null) { 1631 return v; 1632 } 1633 } 1634 } 1635 1636 return null; 1637 } 1638 1639 /** 1640 * Adds a child view. If no layout parameters are already set on the child, the 1641 * default parameters for this ViewGroup are set on the child. 1642 * 1643 * @param child the child view to add 1644 * 1645 * @see #generateDefaultLayoutParams() 1646 */ 1647 public void addView(View child) { 1648 addView(child, -1); 1649 } 1650 1651 /** 1652 * Adds a child view. If no layout parameters are already set on the child, the 1653 * default parameters for this ViewGroup are set on the child. 1654 * 1655 * @param child the child view to add 1656 * @param index the position at which to add the child 1657 * 1658 * @see #generateDefaultLayoutParams() 1659 */ 1660 public void addView(View child, int index) { 1661 LayoutParams params = child.getLayoutParams(); 1662 if (params == null) { 1663 params = generateDefaultLayoutParams(); 1664 if (params == null) { 1665 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 1666 } 1667 } 1668 addView(child, index, params); 1669 } 1670 1671 /** 1672 * Adds a child view with this ViewGroup's default layout parameters and the 1673 * specified width and height. 1674 * 1675 * @param child the child view to add 1676 */ 1677 public void addView(View child, int width, int height) { 1678 final LayoutParams params = generateDefaultLayoutParams(); 1679 params.width = width; 1680 params.height = height; 1681 addView(child, -1, params); 1682 } 1683 1684 /** 1685 * Adds a child view with the specified layout parameters. 1686 * 1687 * @param child the child view to add 1688 * @param params the layout parameters to set on the child 1689 */ 1690 public void addView(View child, LayoutParams params) { 1691 addView(child, -1, params); 1692 } 1693 1694 /** 1695 * Adds a child view with the specified layout parameters. 1696 * 1697 * @param child the child view to add 1698 * @param index the position at which to add the child 1699 * @param params the layout parameters to set on the child 1700 */ 1701 public void addView(View child, int index, LayoutParams params) { 1702 if (DBG) { 1703 System.out.println(this + " addView"); 1704 } 1705 1706 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 1707 // therefore, we call requestLayout() on ourselves before, so that the child's request 1708 // will be blocked at our level 1709 requestLayout(); 1710 invalidate(); 1711 addViewInner(child, index, params, false); 1712 } 1713 1714 /** 1715 * {@inheritDoc} 1716 */ 1717 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 1718 if (!checkLayoutParams(params)) { 1719 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 1720 } 1721 if (view.mParent != this) { 1722 throw new IllegalArgumentException("Given view not a child of " + this); 1723 } 1724 view.setLayoutParams(params); 1725 } 1726 1727 /** 1728 * {@inheritDoc} 1729 */ 1730 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 1731 return p != null; 1732 } 1733 1734 /** 1735 * Interface definition for a callback to be invoked when the hierarchy 1736 * within this view changed. The hierarchy changes whenever a child is added 1737 * to or removed from this view. 1738 */ 1739 public interface OnHierarchyChangeListener { 1740 /** 1741 * Called when a new child is added to a parent view. 1742 * 1743 * @param parent the view in which a child was added 1744 * @param child the new child view added in the hierarchy 1745 */ 1746 void onChildViewAdded(View parent, View child); 1747 1748 /** 1749 * Called when a child is removed from a parent view. 1750 * 1751 * @param parent the view from which the child was removed 1752 * @param child the child removed from the hierarchy 1753 */ 1754 void onChildViewRemoved(View parent, View child); 1755 } 1756 1757 /** 1758 * Register a callback to be invoked when a child is added to or removed 1759 * from this view. 1760 * 1761 * @param listener the callback to invoke on hierarchy change 1762 */ 1763 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 1764 mOnHierarchyChangeListener = listener; 1765 } 1766 1767 /** 1768 * Adds a view during layout. This is useful if in your onLayout() method, 1769 * you need to add more views (as does the list view for example). 1770 * 1771 * If index is negative, it means put it at the end of the list. 1772 * 1773 * @param child the view to add to the group 1774 * @param index the index at which the child must be added 1775 * @param params the layout parameters to associate with the child 1776 * @return true if the child was added, false otherwise 1777 */ 1778 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 1779 return addViewInLayout(child, index, params, false); 1780 } 1781 1782 /** 1783 * Adds a view during layout. This is useful if in your onLayout() method, 1784 * you need to add more views (as does the list view for example). 1785 * 1786 * If index is negative, it means put it at the end of the list. 1787 * 1788 * @param child the view to add to the group 1789 * @param index the index at which the child must be added 1790 * @param params the layout parameters to associate with the child 1791 * @param preventRequestLayout if true, calling this method will not trigger a 1792 * layout request on child 1793 * @return true if the child was added, false otherwise 1794 */ 1795 protected boolean addViewInLayout(View child, int index, LayoutParams params, 1796 boolean preventRequestLayout) { 1797 child.mParent = null; 1798 addViewInner(child, index, params, preventRequestLayout); 1799 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 1800 return true; 1801 } 1802 1803 /** 1804 * Prevents the specified child to be laid out during the next layout pass. 1805 * 1806 * @param child the child on which to perform the cleanup 1807 */ 1808 protected void cleanupLayoutState(View child) { 1809 child.mPrivateFlags &= ~View.FORCE_LAYOUT; 1810 } 1811 1812 private void addViewInner(View child, int index, LayoutParams params, 1813 boolean preventRequestLayout) { 1814 1815 if (child.getParent() != null) { 1816 throw new IllegalStateException("The specified child already has a parent. " + 1817 "You must call removeView() on the child's parent first."); 1818 } 1819 1820 if (!checkLayoutParams(params)) { 1821 params = generateLayoutParams(params); 1822 } 1823 1824 if (preventRequestLayout) { 1825 child.mLayoutParams = params; 1826 } else { 1827 child.setLayoutParams(params); 1828 } 1829 1830 if (index < 0) { 1831 index = mChildrenCount; 1832 } 1833 1834 addInArray(child, index); 1835 1836 // tell our children 1837 if (preventRequestLayout) { 1838 child.assignParent(this); 1839 } else { 1840 child.mParent = this; 1841 } 1842 1843 if (child.hasFocus()) { 1844 requestChildFocus(child, child.findFocus()); 1845 } 1846 1847 AttachInfo ai = mAttachInfo; 1848 if (ai != null) { 1849 boolean lastKeepOn = ai.mKeepScreenOn; 1850 ai.mKeepScreenOn = false; 1851 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 1852 if (ai.mKeepScreenOn) { 1853 needGlobalAttributesUpdate(true); 1854 } 1855 ai.mKeepScreenOn = lastKeepOn; 1856 } 1857 1858 if (mOnHierarchyChangeListener != null) { 1859 mOnHierarchyChangeListener.onChildViewAdded(this, child); 1860 } 1861 1862 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 1863 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 1864 } 1865 } 1866 1867 private void addInArray(View child, int index) { 1868 View[] children = mChildren; 1869 final int count = mChildrenCount; 1870 final int size = children.length; 1871 if (index == count) { 1872 if (size == count) { 1873 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 1874 System.arraycopy(children, 0, mChildren, 0, size); 1875 children = mChildren; 1876 } 1877 children[mChildrenCount++] = child; 1878 } else if (index < count) { 1879 if (size == count) { 1880 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 1881 System.arraycopy(children, 0, mChildren, 0, index); 1882 System.arraycopy(children, index, mChildren, index + 1, count - index); 1883 children = mChildren; 1884 } else { 1885 System.arraycopy(children, index, children, index + 1, count - index); 1886 } 1887 children[index] = child; 1888 mChildrenCount++; 1889 } else { 1890 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 1891 } 1892 } 1893 1894 // This method also sets the child's mParent to null 1895 private void removeFromArray(int index) { 1896 final View[] children = mChildren; 1897 children[index].mParent = null; 1898 final int count = mChildrenCount; 1899 if (index == count - 1) { 1900 children[--mChildrenCount] = null; 1901 } else if (index >= 0 && index < count) { 1902 System.arraycopy(children, index + 1, children, index, count - index - 1); 1903 children[--mChildrenCount] = null; 1904 } else { 1905 throw new IndexOutOfBoundsException(); 1906 } 1907 } 1908 1909 // This method also sets the children's mParent to null 1910 private void removeFromArray(int start, int count) { 1911 final View[] children = mChildren; 1912 final int childrenCount = mChildrenCount; 1913 1914 start = Math.max(0, start); 1915 final int end = Math.min(childrenCount, start + count); 1916 1917 if (start == end) { 1918 return; 1919 } 1920 1921 if (end == childrenCount) { 1922 for (int i = start; i < end; i++) { 1923 children[i].mParent = null; 1924 children[i] = null; 1925 } 1926 } else { 1927 for (int i = start; i < end; i++) { 1928 children[i].mParent = null; 1929 } 1930 1931 // Since we're looping above, we might as well do the copy, but is arraycopy() 1932 // faster than the extra 2 bounds checks we would do in the loop? 1933 System.arraycopy(children, end, children, start, childrenCount - end); 1934 1935 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 1936 children[i] = null; 1937 } 1938 } 1939 1940 mChildrenCount -= (end - start); 1941 } 1942 1943 private void bindLayoutAnimation(View child) { 1944 Animation a = mLayoutAnimationController.getAnimationForView(child); 1945 child.setAnimation(a); 1946 } 1947 1948 /** 1949 * Subclasses should override this method to set layout animation 1950 * parameters on the supplied child. 1951 * 1952 * @param child the child to associate with animation parameters 1953 * @param params the child's layout parameters which hold the animation 1954 * parameters 1955 * @param index the index of the child in the view group 1956 * @param count the number of children in the view group 1957 */ 1958 protected void attachLayoutAnimationParameters(View child, 1959 LayoutParams params, int index, int count) { 1960 LayoutAnimationController.AnimationParameters animationParams = 1961 params.layoutAnimationParameters; 1962 if (animationParams == null) { 1963 animationParams = new LayoutAnimationController.AnimationParameters(); 1964 params.layoutAnimationParameters = animationParams; 1965 } 1966 1967 animationParams.count = count; 1968 animationParams.index = index; 1969 } 1970 1971 /** 1972 * {@inheritDoc} 1973 */ 1974 public void removeView(View view) { 1975 removeViewInternal(view); 1976 requestLayout(); 1977 invalidate(); 1978 } 1979 1980 /** 1981 * Removes a view during layout. This is useful if in your onLayout() method, 1982 * you need to remove more views. 1983 * 1984 * @param view the view to remove from the group 1985 */ 1986 public void removeViewInLayout(View view) { 1987 removeViewInternal(view); 1988 } 1989 1990 /** 1991 * Removes a range of views during layout. This is useful if in your onLayout() method, 1992 * you need to remove more views. 1993 * 1994 * @param start the index of the first view to remove from the group 1995 * @param count the number of views to remove from the group 1996 */ 1997 public void removeViewsInLayout(int start, int count) { 1998 removeViewsInternal(start, count); 1999 } 2000 2001 /** 2002 * Removes the view at the specified position in the group. 2003 * 2004 * @param index the position in the group of the view to remove 2005 */ 2006 public void removeViewAt(int index) { 2007 removeViewInternal(index, getChildAt(index)); 2008 requestLayout(); 2009 invalidate(); 2010 } 2011 2012 /** 2013 * Removes the specified range of views from the group. 2014 * 2015 * @param start the first position in the group of the range of views to remove 2016 * @param count the number of views to remove 2017 */ 2018 public void removeViews(int start, int count) { 2019 removeViewsInternal(start, count); 2020 requestLayout(); 2021 invalidate(); 2022 } 2023 2024 private void removeViewInternal(View view) { 2025 final int index = indexOfChild(view); 2026 if (index >= 0) { 2027 removeViewInternal(index, view); 2028 } 2029 } 2030 2031 private void removeViewInternal(int index, View view) { 2032 boolean clearChildFocus = false; 2033 if (view == mFocused) { 2034 view.clearFocusForRemoval(); 2035 clearChildFocus = true; 2036 } 2037 2038 if (view.getAnimation() != null) { 2039 addDisappearingView(view); 2040 } else if (view.mAttachInfo != null) { 2041 view.dispatchDetachedFromWindow(); 2042 } 2043 2044 if (mOnHierarchyChangeListener != null) { 2045 mOnHierarchyChangeListener.onChildViewRemoved(this, view); 2046 } 2047 2048 needGlobalAttributesUpdate(false); 2049 2050 removeFromArray(index); 2051 2052 if (clearChildFocus) { 2053 clearChildFocus(view); 2054 } 2055 } 2056 2057 private void removeViewsInternal(int start, int count) { 2058 final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener; 2059 final boolean notifyListener = onHierarchyChangeListener != null; 2060 final View focused = mFocused; 2061 final boolean detach = mAttachInfo != null; 2062 View clearChildFocus = null; 2063 2064 final View[] children = mChildren; 2065 final int end = start + count; 2066 2067 for (int i = start; i < end; i++) { 2068 final View view = children[i]; 2069 2070 if (view == focused) { 2071 view.clearFocusForRemoval(); 2072 clearChildFocus = view; 2073 } 2074 2075 if (view.getAnimation() != null) { 2076 addDisappearingView(view); 2077 } else if (detach) { 2078 view.dispatchDetachedFromWindow(); 2079 } 2080 2081 needGlobalAttributesUpdate(false); 2082 2083 if (notifyListener) { 2084 onHierarchyChangeListener.onChildViewRemoved(this, view); 2085 } 2086 } 2087 2088 removeFromArray(start, count); 2089 2090 if (clearChildFocus != null) { 2091 clearChildFocus(clearChildFocus); 2092 } 2093 } 2094 2095 /** 2096 * Call this method to remove all child views from the 2097 * ViewGroup. 2098 */ 2099 public void removeAllViews() { 2100 removeAllViewsInLayout(); 2101 requestLayout(); 2102 invalidate(); 2103 } 2104 2105 /** 2106 * Called by a ViewGroup subclass to remove child views from itself, 2107 * when it must first know its size on screen before it can calculate how many 2108 * child views it will render. An example is a Gallery or a ListView, which 2109 * may "have" 50 children, but actually only render the number of children 2110 * that can currently fit inside the object on screen. Do not call 2111 * this method unless you are extending ViewGroup and understand the 2112 * view measuring and layout pipeline. 2113 */ 2114 public void removeAllViewsInLayout() { 2115 final int count = mChildrenCount; 2116 if (count <= 0) { 2117 return; 2118 } 2119 2120 final View[] children = mChildren; 2121 mChildrenCount = 0; 2122 2123 final OnHierarchyChangeListener listener = mOnHierarchyChangeListener; 2124 final boolean notify = listener != null; 2125 final View focused = mFocused; 2126 final boolean detach = mAttachInfo != null; 2127 View clearChildFocus = null; 2128 2129 needGlobalAttributesUpdate(false); 2130 2131 for (int i = count - 1; i >= 0; i--) { 2132 final View view = children[i]; 2133 2134 if (view == focused) { 2135 view.clearFocusForRemoval(); 2136 clearChildFocus = view; 2137 } 2138 2139 if (view.getAnimation() != null) { 2140 addDisappearingView(view); 2141 } else if (detach) { 2142 view.dispatchDetachedFromWindow(); 2143 } 2144 2145 if (notify) { 2146 listener.onChildViewRemoved(this, view); 2147 } 2148 2149 view.mParent = null; 2150 children[i] = null; 2151 } 2152 2153 if (clearChildFocus != null) { 2154 clearChildFocus(clearChildFocus); 2155 } 2156 } 2157 2158 /** 2159 * Finishes the removal of a detached view. This method will dispatch the detached from 2160 * window event and notify the hierarchy change listener. 2161 * 2162 * @param child the child to be definitely removed from the view hierarchy 2163 * @param animate if true and the view has an animation, the view is placed in the 2164 * disappearing views list, otherwise, it is detached from the window 2165 * 2166 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2167 * @see #detachAllViewsFromParent() 2168 * @see #detachViewFromParent(View) 2169 * @see #detachViewFromParent(int) 2170 */ 2171 protected void removeDetachedView(View child, boolean animate) { 2172 if (child == mFocused) { 2173 child.clearFocus(); 2174 } 2175 2176 if (animate && child.getAnimation() != null) { 2177 addDisappearingView(child); 2178 } else if (child.mAttachInfo != null) { 2179 child.dispatchDetachedFromWindow(); 2180 } 2181 2182 if (mOnHierarchyChangeListener != null) { 2183 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 2184 } 2185 } 2186 2187 /** 2188 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 2189 * sets the layout parameters and puts the view in the list of children so it can be retrieved 2190 * by calling {@link #getChildAt(int)}. 2191 * 2192 * This method should be called only for view which were detached from their parent. 2193 * 2194 * @param child the child to attach 2195 * @param index the index at which the child should be attached 2196 * @param params the layout parameters of the child 2197 * 2198 * @see #removeDetachedView(View, boolean) 2199 * @see #detachAllViewsFromParent() 2200 * @see #detachViewFromParent(View) 2201 * @see #detachViewFromParent(int) 2202 */ 2203 protected void attachViewToParent(View child, int index, LayoutParams params) { 2204 child.mLayoutParams = params; 2205 2206 if (index < 0) { 2207 index = mChildrenCount; 2208 } 2209 2210 addInArray(child, index); 2211 2212 child.mParent = this; 2213 child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; 2214 2215 if (child.hasFocus()) { 2216 requestChildFocus(child, child.findFocus()); 2217 } 2218 } 2219 2220 /** 2221 * Detaches a view from its parent. Detaching a view should be temporary and followed 2222 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2223 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2224 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2225 * 2226 * @param child the child to detach 2227 * 2228 * @see #detachViewFromParent(int) 2229 * @see #detachViewsFromParent(int, int) 2230 * @see #detachAllViewsFromParent() 2231 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2232 * @see #removeDetachedView(View, boolean) 2233 */ 2234 protected void detachViewFromParent(View child) { 2235 removeFromArray(indexOfChild(child)); 2236 } 2237 2238 /** 2239 * Detaches a view from its parent. Detaching a view should be temporary and followed 2240 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2241 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2242 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2243 * 2244 * @param index the index of the child to detach 2245 * 2246 * @see #detachViewFromParent(View) 2247 * @see #detachAllViewsFromParent() 2248 * @see #detachViewsFromParent(int, int) 2249 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2250 * @see #removeDetachedView(View, boolean) 2251 */ 2252 protected void detachViewFromParent(int index) { 2253 removeFromArray(index); 2254 } 2255 2256 /** 2257 * Detaches a range of view from their parent. Detaching a view should be temporary and followed 2258 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2259 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its 2260 * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2261 * 2262 * @param start the first index of the childrend range to detach 2263 * @param count the number of children to detach 2264 * 2265 * @see #detachViewFromParent(View) 2266 * @see #detachViewFromParent(int) 2267 * @see #detachAllViewsFromParent() 2268 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2269 * @see #removeDetachedView(View, boolean) 2270 */ 2271 protected void detachViewsFromParent(int start, int count) { 2272 removeFromArray(start, count); 2273 } 2274 2275 /** 2276 * Detaches all views from the parent. Detaching a view should be temporary and followed 2277 * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 2278 * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, 2279 * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. 2280 * 2281 * @see #detachViewFromParent(View) 2282 * @see #detachViewFromParent(int) 2283 * @see #detachViewsFromParent(int, int) 2284 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 2285 * @see #removeDetachedView(View, boolean) 2286 */ 2287 protected void detachAllViewsFromParent() { 2288 final int count = mChildrenCount; 2289 if (count <= 0) { 2290 return; 2291 } 2292 2293 final View[] children = mChildren; 2294 mChildrenCount = 0; 2295 2296 for (int i = count - 1; i >= 0; i--) { 2297 children[i].mParent = null; 2298 children[i] = null; 2299 } 2300 } 2301 2302 /** 2303 * Don't call or override this method. It is used for the implementation of 2304 * the view hierarchy. 2305 */ 2306 public final void invalidateChild(View child, final Rect dirty) { 2307 if (ViewDebug.TRACE_HIERARCHY) { 2308 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); 2309 } 2310 2311 ViewParent parent = this; 2312 2313 final AttachInfo attachInfo = mAttachInfo; 2314 if (attachInfo != null) { 2315 final int[] location = attachInfo.mInvalidateChildLocation; 2316 location[CHILD_LEFT_INDEX] = child.mLeft; 2317 location[CHILD_TOP_INDEX] = child.mTop; 2318 2319 // If the child is drawing an animation, we want to copy this flag onto 2320 // ourselves and the parent to make sure the invalidate request goes 2321 // through 2322 final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; 2323 2324 // Check whether the child that requests the invalidate is fully opaque 2325 final boolean isOpaque = child.isOpaque(); 2326 // Mark the child as dirty, using the appropriate flag 2327 // Make sure we do not set both flags at the same time 2328 final int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; 2329 2330 do { 2331 View view = null; 2332 if (parent instanceof View) { 2333 view = (View) parent; 2334 } 2335 2336 if (drawAnimation) { 2337 if (view != null) { 2338 view.mPrivateFlags |= DRAW_ANIMATION; 2339 } else if (parent instanceof ViewRoot) { 2340 ((ViewRoot) parent).mIsAnimating = true; 2341 } 2342 } 2343 2344 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 2345 // flag coming from the child that initiated the invalidate 2346 if (view != null && (view.mPrivateFlags & DIRTY_MASK) != DIRTY) { 2347 view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; 2348 } 2349 2350 parent = parent.invalidateChildInParent(location, dirty); 2351 } while (parent != null); 2352 } 2353 } 2354 2355 /** 2356 * Don't call or override this method. It is used for the implementation of 2357 * the view hierarchy. 2358 * 2359 * This implementation returns null if this ViewGroup does not have a parent, 2360 * if this ViewGroup is already fully invalidated or if the dirty rectangle 2361 * does not intersect with this ViewGroup's bounds. 2362 */ 2363 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 2364 if (ViewDebug.TRACE_HIERARCHY) { 2365 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); 2366 } 2367 2368 if ((mPrivateFlags & DRAWN) == DRAWN) { 2369 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 2370 FLAG_OPTIMIZE_INVALIDATE) { 2371 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 2372 location[CHILD_TOP_INDEX] - mScrollY); 2373 2374 final int left = mLeft; 2375 final int top = mTop; 2376 2377 if (dirty.intersect(0, 0, mRight - left, mBottom - top) || 2378 (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 2379 mPrivateFlags &= ~DRAWING_CACHE_VALID; 2380 2381 location[CHILD_LEFT_INDEX] = left; 2382 location[CHILD_TOP_INDEX] = top; 2383 2384 return mParent; 2385 } 2386 } else { 2387 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 2388 2389 location[CHILD_LEFT_INDEX] = mLeft; 2390 location[CHILD_TOP_INDEX] = mTop; 2391 2392 dirty.set(0, 0, mRight - location[CHILD_LEFT_INDEX], 2393 mBottom - location[CHILD_TOP_INDEX]); 2394 2395 return mParent; 2396 } 2397 } 2398 2399 return null; 2400 } 2401 2402 /** 2403 * Offset a rectangle that is in a descendant's coordinate 2404 * space into our coordinate space. 2405 * @param descendant A descendant of this view 2406 * @param rect A rectangle defined in descendant's coordinate space. 2407 */ 2408 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 2409 offsetRectBetweenParentAndChild(descendant, rect, true, false); 2410 } 2411 2412 /** 2413 * Offset a rectangle that is in our coordinate space into an ancestor's 2414 * coordinate space. 2415 * @param descendant A descendant of this view 2416 * @param rect A rectangle defined in descendant's coordinate space. 2417 */ 2418 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 2419 offsetRectBetweenParentAndChild(descendant, rect, false, false); 2420 } 2421 2422 /** 2423 * Helper method that offsets a rect either from parent to descendant or 2424 * descendant to parent. 2425 */ 2426 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 2427 boolean offsetFromChildToParent, boolean clipToBounds) { 2428 2429 // already in the same coord system :) 2430 if (descendant == this) { 2431 return; 2432 } 2433 2434 ViewParent theParent = descendant.mParent; 2435 2436 // search and offset up to the parent 2437 while ((theParent != null) 2438 && (theParent instanceof View) 2439 && (theParent != this)) { 2440 2441 if (offsetFromChildToParent) { 2442 rect.offset(descendant.mLeft - descendant.mScrollX, 2443 descendant.mTop - descendant.mScrollY); 2444 if (clipToBounds) { 2445 View p = (View) theParent; 2446 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2447 } 2448 } else { 2449 if (clipToBounds) { 2450 View p = (View) theParent; 2451 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 2452 } 2453 rect.offset(descendant.mScrollX - descendant.mLeft, 2454 descendant.mScrollY - descendant.mTop); 2455 } 2456 2457 descendant = (View) theParent; 2458 theParent = descendant.mParent; 2459 } 2460 2461 // now that we are up to this view, need to offset one more time 2462 // to get into our coordinate space 2463 if (theParent == this) { 2464 if (offsetFromChildToParent) { 2465 rect.offset(descendant.mLeft - descendant.mScrollX, 2466 descendant.mTop - descendant.mScrollY); 2467 } else { 2468 rect.offset(descendant.mScrollX - descendant.mLeft, 2469 descendant.mScrollY - descendant.mTop); 2470 } 2471 } else { 2472 throw new IllegalArgumentException("parameter must be a descendant of this view"); 2473 } 2474 } 2475 2476 /** 2477 * Offset the vertical location of all children of this view by the specified number of pixels. 2478 * 2479 * @param offset the number of pixels to offset 2480 * 2481 * @hide 2482 */ 2483 public void offsetChildrenTopAndBottom(int offset) { 2484 final int count = mChildrenCount; 2485 final View[] children = mChildren; 2486 2487 for (int i = 0; i < count; i++) { 2488 final View v = children[i]; 2489 v.mTop += offset; 2490 v.mBottom += offset; 2491 } 2492 } 2493 2494 /** 2495 * {@inheritDoc} 2496 */ 2497 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 2498 int dx = child.mLeft - mScrollX; 2499 int dy = child.mTop - mScrollY; 2500 if (offset != null) { 2501 offset.x += dx; 2502 offset.y += dy; 2503 } 2504 r.offset(dx, dy); 2505 return r.intersect(0, 0, mRight - mLeft, mBottom - mTop) && 2506 (mParent == null || mParent.getChildVisibleRect(this, r, offset)); 2507 } 2508 2509 /** 2510 * {@inheritDoc} 2511 */ 2512 @Override 2513 protected abstract void onLayout(boolean changed, 2514 int l, int t, int r, int b); 2515 2516 /** 2517 * Indicates whether the view group has the ability to animate its children 2518 * after the first layout. 2519 * 2520 * @return true if the children can be animated, false otherwise 2521 */ 2522 protected boolean canAnimate() { 2523 return mLayoutAnimationController != null; 2524 } 2525 2526 /** 2527 * Runs the layout animation. Calling this method triggers a relayout of 2528 * this view group. 2529 */ 2530 public void startLayoutAnimation() { 2531 if (mLayoutAnimationController != null) { 2532 mGroupFlags |= FLAG_RUN_ANIMATION; 2533 requestLayout(); 2534 } 2535 } 2536 2537 /** 2538 * Schedules the layout animation to be played after the next layout pass 2539 * of this view group. This can be used to restart the layout animation 2540 * when the content of the view group changes or when the activity is 2541 * paused and resumed. 2542 */ 2543 public void scheduleLayoutAnimation() { 2544 mGroupFlags |= FLAG_RUN_ANIMATION; 2545 } 2546 2547 /** 2548 * Sets the layout animation controller used to animate the group's 2549 * children after the first layout. 2550 * 2551 * @param controller the animation controller 2552 */ 2553 public void setLayoutAnimation(LayoutAnimationController controller) { 2554 mLayoutAnimationController = controller; 2555 if (mLayoutAnimationController != null) { 2556 mGroupFlags |= FLAG_RUN_ANIMATION; 2557 } 2558 } 2559 2560 /** 2561 * Returns the layout animation controller used to animate the group's 2562 * children. 2563 * 2564 * @return the current animation controller 2565 */ 2566 public LayoutAnimationController getLayoutAnimation() { 2567 return mLayoutAnimationController; 2568 } 2569 2570 /** 2571 * Indicates whether the children's drawing cache is used during a layout 2572 * animation. By default, the drawing cache is enabled but this will prevent 2573 * nested layout animations from working. To nest animations, you must disable 2574 * the cache. 2575 * 2576 * @return true if the animation cache is enabled, false otherwise 2577 * 2578 * @see #setAnimationCacheEnabled(boolean) 2579 * @see View#setDrawingCacheEnabled(boolean) 2580 */ 2581 @ViewDebug.ExportedProperty 2582 public boolean isAnimationCacheEnabled() { 2583 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2584 } 2585 2586 /** 2587 * Enables or disables the children's drawing cache during a layout animation. 2588 * By default, the drawing cache is enabled but this will prevent nested 2589 * layout animations from working. To nest animations, you must disable the 2590 * cache. 2591 * 2592 * @param enabled true to enable the animation cache, false otherwise 2593 * 2594 * @see #isAnimationCacheEnabled() 2595 * @see View#setDrawingCacheEnabled(boolean) 2596 */ 2597 public void setAnimationCacheEnabled(boolean enabled) { 2598 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 2599 } 2600 2601 /** 2602 * Indicates whether this ViewGroup will always try to draw its children using their 2603 * drawing cache. By default this property is enabled. 2604 * 2605 * @return true if the animation cache is enabled, false otherwise 2606 * 2607 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2608 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2609 * @see View#setDrawingCacheEnabled(boolean) 2610 */ 2611 @ViewDebug.ExportedProperty 2612 public boolean isAlwaysDrawnWithCacheEnabled() { 2613 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 2614 } 2615 2616 /** 2617 * Indicates whether this ViewGroup will always try to draw its children using their 2618 * drawing cache. This property can be set to true when the cache rendering is 2619 * slightly different from the children's normal rendering. Renderings can be different, 2620 * for instance, when the cache's quality is set to low. 2621 * 2622 * When this property is disabled, the ViewGroup will use the drawing cache of its 2623 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 2624 * when to start using the drawing cache and when to stop using it. 2625 * 2626 * @param always true to always draw with the drawing cache, false otherwise 2627 * 2628 * @see #isAlwaysDrawnWithCacheEnabled() 2629 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2630 * @see View#setDrawingCacheEnabled(boolean) 2631 * @see View#setDrawingCacheQuality(int) 2632 */ 2633 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 2634 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 2635 } 2636 2637 /** 2638 * Indicates whether the ViewGroup is currently drawing its children using 2639 * their drawing cache. 2640 * 2641 * @return true if children should be drawn with their cache, false otherwise 2642 * 2643 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2644 * @see #setChildrenDrawnWithCacheEnabled(boolean) 2645 */ 2646 @ViewDebug.ExportedProperty 2647 protected boolean isChildrenDrawnWithCacheEnabled() { 2648 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 2649 } 2650 2651 /** 2652 * Tells the ViewGroup to draw its children using their drawing cache. This property 2653 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 2654 * will be used only if it has been enabled. 2655 * 2656 * Subclasses should call this method to start and stop using the drawing cache when 2657 * they perform performance sensitive operations, like scrolling or animating. 2658 * 2659 * @param enabled true if children should be drawn with their cache, false otherwise 2660 * 2661 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 2662 * @see #isChildrenDrawnWithCacheEnabled() 2663 */ 2664 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 2665 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 2666 } 2667 2668 private void setBooleanFlag(int flag, boolean value) { 2669 if (value) { 2670 mGroupFlags |= flag; 2671 } else { 2672 mGroupFlags &= ~flag; 2673 } 2674 } 2675 2676 /** 2677 * Returns an integer indicating what types of drawing caches are kept in memory. 2678 * 2679 * @see #setPersistentDrawingCache(int) 2680 * @see #setAnimationCacheEnabled(boolean) 2681 * 2682 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 2683 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2684 * and {@link #PERSISTENT_ALL_CACHES} 2685 */ 2686 @ViewDebug.ExportedProperty(mapping = { 2687 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 2688 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ANIMATION"), 2689 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 2690 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 2691 }) 2692 public int getPersistentDrawingCache() { 2693 return mPersistentDrawingCache; 2694 } 2695 2696 /** 2697 * Indicates what types of drawing caches should be kept in memory after 2698 * they have been created. 2699 * 2700 * @see #getPersistentDrawingCache() 2701 * @see #setAnimationCacheEnabled(boolean) 2702 * 2703 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 2704 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 2705 * and {@link #PERSISTENT_ALL_CACHES} 2706 */ 2707 public void setPersistentDrawingCache(int drawingCacheToKeep) { 2708 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 2709 } 2710 2711 /** 2712 * Returns a new set of layout parameters based on the supplied attributes set. 2713 * 2714 * @param attrs the attributes to build the layout parameters from 2715 * 2716 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2717 * of its descendants 2718 */ 2719 public LayoutParams generateLayoutParams(AttributeSet attrs) { 2720 return new LayoutParams(getContext(), attrs); 2721 } 2722 2723 /** 2724 * Returns a safe set of layout parameters based on the supplied layout params. 2725 * When a ViewGroup is passed a View whose layout params do not pass the test of 2726 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 2727 * is invoked. This method should return a new set of layout params suitable for 2728 * this ViewGroup, possibly by copying the appropriate attributes from the 2729 * specified set of layout params. 2730 * 2731 * @param p The layout parameters to convert into a suitable set of layout parameters 2732 * for this ViewGroup. 2733 * 2734 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 2735 * of its descendants 2736 */ 2737 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 2738 return p; 2739 } 2740 2741 /** 2742 * Returns a set of default layout parameters. These parameters are requested 2743 * when the View passed to {@link #addView(View)} has no layout parameters 2744 * already set. If null is returned, an exception is thrown from addView. 2745 * 2746 * @return a set of default layout parameters or null 2747 */ 2748 protected LayoutParams generateDefaultLayoutParams() { 2749 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 2750 } 2751 2752 /** 2753 * {@inheritDoc} 2754 */ 2755 @Override 2756 protected void debug(int depth) { 2757 super.debug(depth); 2758 String output; 2759 2760 if (mFocused != null) { 2761 output = debugIndent(depth); 2762 output += "mFocused"; 2763 Log.d(VIEW_LOG_TAG, output); 2764 } 2765 if (mChildrenCount != 0) { 2766 output = debugIndent(depth); 2767 output += "{"; 2768 Log.d(VIEW_LOG_TAG, output); 2769 } 2770 int count = mChildrenCount; 2771 for (int i = 0; i < count; i++) { 2772 View child = mChildren[i]; 2773 child.debug(depth + 1); 2774 } 2775 2776 if (mChildrenCount != 0) { 2777 output = debugIndent(depth); 2778 output += "}"; 2779 Log.d(VIEW_LOG_TAG, output); 2780 } 2781 } 2782 2783 /** 2784 * Returns the position in the group of the specified child view. 2785 * 2786 * @param child the view for which to get the position 2787 * @return a positive integer representing the position of the view in the 2788 * group, or -1 if the view does not exist in the group 2789 */ 2790 public int indexOfChild(View child) { 2791 final int count = mChildrenCount; 2792 final View[] children = mChildren; 2793 for (int i = 0; i < count; i++) { 2794 if (children[i] == child) { 2795 return i; 2796 } 2797 } 2798 return -1; 2799 } 2800 2801 /** 2802 * Returns the number of children in the group. 2803 * 2804 * @return a positive integer representing the number of children in 2805 * the group 2806 */ 2807 public int getChildCount() { 2808 return mChildrenCount; 2809 } 2810 2811 /** 2812 * Returns the view at the specified position in the group. 2813 * 2814 * @param index the position at which to get the view from 2815 * @return the view at the specified position or null if the position 2816 * does not exist within the group 2817 */ 2818 public View getChildAt(int index) { 2819 try { 2820 return mChildren[index]; 2821 } catch (IndexOutOfBoundsException ex) { 2822 return null; 2823 } 2824 } 2825 2826 /** 2827 * Ask all of the children of this view to measure themselves, taking into 2828 * account both the MeasureSpec requirements for this view and its padding. 2829 * We skip children that are in the GONE state The heavy lifting is done in 2830 * getChildMeasureSpec. 2831 * 2832 * @param widthMeasureSpec The width requirements for this view 2833 * @param heightMeasureSpec The height requirements for this view 2834 */ 2835 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 2836 final int size = mChildrenCount; 2837 final View[] children = mChildren; 2838 for (int i = 0; i < size; ++i) { 2839 final View child = children[i]; 2840 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 2841 measureChild(child, widthMeasureSpec, heightMeasureSpec); 2842 } 2843 } 2844 } 2845 2846 /** 2847 * Ask one of the children of this view to measure itself, taking into 2848 * account both the MeasureSpec requirements for this view and its padding. 2849 * The heavy lifting is done in getChildMeasureSpec. 2850 * 2851 * @param child The child to measure 2852 * @param parentWidthMeasureSpec The width requirements for this view 2853 * @param parentHeightMeasureSpec The height requirements for this view 2854 */ 2855 protected void measureChild(View child, int parentWidthMeasureSpec, 2856 int parentHeightMeasureSpec) { 2857 final LayoutParams lp = child.getLayoutParams(); 2858 2859 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 2860 mPaddingLeft + mPaddingRight, lp.width); 2861 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 2862 mPaddingTop + mPaddingBottom, lp.height); 2863 2864 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 2865 } 2866 2867 /** 2868 * Ask one of the children of this view to measure itself, taking into 2869 * account both the MeasureSpec requirements for this view and its padding 2870 * and margins. The child must have MarginLayoutParams The heavy lifting is 2871 * done in getChildMeasureSpec. 2872 * 2873 * @param child The child to measure 2874 * @param parentWidthMeasureSpec The width requirements for this view 2875 * @param widthUsed Extra space that has been used up by the parent 2876 * horizontally (possibly by other children of the parent) 2877 * @param parentHeightMeasureSpec The height requirements for this view 2878 * @param heightUsed Extra space that has been used up by the parent 2879 * vertically (possibly by other children of the parent) 2880 */ 2881 protected void measureChildWithMargins(View child, 2882 int parentWidthMeasureSpec, int widthUsed, 2883 int parentHeightMeasureSpec, int heightUsed) { 2884 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 2885 2886 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 2887 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 2888 + widthUsed, lp.width); 2889 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 2890 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 2891 + heightUsed, lp.height); 2892 2893 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 2894 } 2895 2896 /** 2897 * Does the hard part of measureChildren: figuring out the MeasureSpec to 2898 * pass to a particular child. This method figures out the right MeasureSpec 2899 * for one dimension (height or width) of one child view. 2900 * 2901 * The goal is to combine information from our MeasureSpec with the 2902 * LayoutParams of the child to get the best possible results. For example, 2903 * if the this view knows its size (because its MeasureSpec has a mode of 2904 * EXACTLY), and the child has indicated in its LayoutParams that it wants 2905 * to be the same size as the parent, the parent should ask the child to 2906 * layout given an exact size. 2907 * 2908 * @param spec The requirements for this view 2909 * @param padding The padding of this view for the current dimension and 2910 * margins, if applicable 2911 * @param childDimension How big the child wants to be in the current 2912 * dimension 2913 * @return a MeasureSpec integer for the child 2914 */ 2915 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 2916 int specMode = MeasureSpec.getMode(spec); 2917 int specSize = MeasureSpec.getSize(spec); 2918 2919 int size = Math.max(0, specSize - padding); 2920 2921 int resultSize = 0; 2922 int resultMode = 0; 2923 2924 switch (specMode) { 2925 // Parent has imposed an exact size on us 2926 case MeasureSpec.EXACTLY: 2927 if (childDimension >= 0) { 2928 resultSize = childDimension; 2929 resultMode = MeasureSpec.EXACTLY; 2930 } else if (childDimension == LayoutParams.FILL_PARENT) { 2931 // Child wants to be our size. So be it. 2932 resultSize = size; 2933 resultMode = MeasureSpec.EXACTLY; 2934 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 2935 // Child wants to determine its own size. It can't be 2936 // bigger than us. 2937 resultSize = size; 2938 resultMode = MeasureSpec.AT_MOST; 2939 } 2940 break; 2941 2942 // Parent has imposed a maximum size on us 2943 case MeasureSpec.AT_MOST: 2944 if (childDimension >= 0) { 2945 // Child wants a specific size... so be it 2946 resultSize = childDimension; 2947 resultMode = MeasureSpec.EXACTLY; 2948 } else if (childDimension == LayoutParams.FILL_PARENT) { 2949 // Child wants to be our size, but our size is not fixed. 2950 // Constrain child to not be bigger than us. 2951 resultSize = size; 2952 resultMode = MeasureSpec.AT_MOST; 2953 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 2954 // Child wants to determine its own size. It can't be 2955 // bigger than us. 2956 resultSize = size; 2957 resultMode = MeasureSpec.AT_MOST; 2958 } 2959 break; 2960 2961 // Parent asked to see how big we want to be 2962 case MeasureSpec.UNSPECIFIED: 2963 if (childDimension >= 0) { 2964 // Child wants a specific size... let him have it 2965 resultSize = childDimension; 2966 resultMode = MeasureSpec.EXACTLY; 2967 } else if (childDimension == LayoutParams.FILL_PARENT) { 2968 // Child wants to be our size... find out how big it should 2969 // be 2970 resultSize = 0; 2971 resultMode = MeasureSpec.UNSPECIFIED; 2972 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 2973 // Child wants to determine its own size.... find out how 2974 // big it should be 2975 resultSize = 0; 2976 resultMode = MeasureSpec.UNSPECIFIED; 2977 } 2978 break; 2979 } 2980 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 2981 } 2982 2983 2984 /** 2985 * Removes any pending animations for views that have been removed. Call 2986 * this if you don't want animations for exiting views to stack up. 2987 */ 2988 public void clearDisappearingChildren() { 2989 if (mDisappearingChildren != null) { 2990 mDisappearingChildren.clear(); 2991 } 2992 } 2993 2994 /** 2995 * Add a view which is removed from mChildren but still needs animation 2996 * 2997 * @param v View to add 2998 */ 2999 private void addDisappearingView(View v) { 3000 ArrayList<View> disappearingChildren = mDisappearingChildren; 3001 3002 if (disappearingChildren == null) { 3003 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 3004 } 3005 3006 disappearingChildren.add(v); 3007 } 3008 3009 /** 3010 * Cleanup a view when its animation is done. This may mean removing it from 3011 * the list of disappearing views. 3012 * 3013 * @param view The view whose animation has finished 3014 * @param animation The animation, cannot be null 3015 */ 3016 private void finishAnimatingView(final View view, Animation animation) { 3017 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3018 if (disappearingChildren != null) { 3019 if (disappearingChildren.contains(view)) { 3020 disappearingChildren.remove(view); 3021 3022 if (view.mAttachInfo != null) { 3023 view.dispatchDetachedFromWindow(); 3024 } 3025 3026 view.clearAnimation(); 3027 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3028 } 3029 } 3030 3031 if (animation != null && !animation.getFillAfter()) { 3032 view.clearAnimation(); 3033 } 3034 3035 if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { 3036 view.onAnimationEnd(); 3037 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 3038 // so we'd rather be safe than sorry 3039 view.mPrivateFlags &= ~ANIMATION_STARTED; 3040 // Draw one more frame after the animation is done 3041 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 3042 } 3043 } 3044 3045 /** 3046 * {@inheritDoc} 3047 */ 3048 @Override 3049 public boolean gatherTransparentRegion(Region region) { 3050 // If no transparent regions requested, we are always opaque. 3051 final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; 3052 if (meOpaque && region == null) { 3053 // The caller doesn't care about the region, so stop now. 3054 return true; 3055 } 3056 super.gatherTransparentRegion(region); 3057 final View[] children = mChildren; 3058 final int count = mChildrenCount; 3059 boolean noneOfTheChildrenAreTransparent = true; 3060 for (int i = 0; i < count; i++) { 3061 final View child = children[i]; 3062 if ((child.mViewFlags & VISIBILITY_MASK) != GONE || child.getAnimation() != null) { 3063 if (!child.gatherTransparentRegion(region)) { 3064 noneOfTheChildrenAreTransparent = false; 3065 } 3066 } 3067 } 3068 return meOpaque || noneOfTheChildrenAreTransparent; 3069 } 3070 3071 /** 3072 * {@inheritDoc} 3073 */ 3074 public void requestTransparentRegion(View child) { 3075 if (child != null) { 3076 child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; 3077 if (mParent != null) { 3078 mParent.requestTransparentRegion(this); 3079 } 3080 } 3081 } 3082 3083 3084 @Override 3085 protected boolean fitSystemWindows(Rect insets) { 3086 boolean done = super.fitSystemWindows(insets); 3087 if (!done) { 3088 final int count = mChildrenCount; 3089 final View[] children = mChildren; 3090 for (int i = 0; i < count; i++) { 3091 done = children[i].fitSystemWindows(insets); 3092 if (done) { 3093 break; 3094 } 3095 } 3096 } 3097 return done; 3098 } 3099 3100 /** 3101 * Returns the animation listener to which layout animation events are 3102 * sent. 3103 * 3104 * @return an {@link android.view.animation.Animation.AnimationListener} 3105 */ 3106 public Animation.AnimationListener getLayoutAnimationListener() { 3107 return mAnimationListener; 3108 } 3109 3110 @Override 3111 protected void drawableStateChanged() { 3112 super.drawableStateChanged(); 3113 3114 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 3115 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3116 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 3117 + " child has duplicateParentState set to true"); 3118 } 3119 3120 final View[] children = mChildren; 3121 final int count = mChildrenCount; 3122 3123 for (int i = 0; i < count; i++) { 3124 final View child = children[i]; 3125 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 3126 child.refreshDrawableState(); 3127 } 3128 } 3129 } 3130 } 3131 3132 @Override 3133 protected int[] onCreateDrawableState(int extraSpace) { 3134 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 3135 return super.onCreateDrawableState(extraSpace); 3136 } 3137 3138 int need = 0; 3139 int n = getChildCount(); 3140 for (int i = 0; i < n; i++) { 3141 int[] childState = getChildAt(i).getDrawableState(); 3142 3143 if (childState != null) { 3144 need += childState.length; 3145 } 3146 } 3147 3148 int[] state = super.onCreateDrawableState(extraSpace + need); 3149 3150 for (int i = 0; i < n; i++) { 3151 int[] childState = getChildAt(i).getDrawableState(); 3152 3153 if (childState != null) { 3154 state = mergeDrawableStates(state, childState); 3155 } 3156 } 3157 3158 return state; 3159 } 3160 3161 /** 3162 * Sets whether this ViewGroup's drawable states also include 3163 * its children's drawable states. This is used, for example, to 3164 * make a group appear to be focused when its child EditText or button 3165 * is focused. 3166 */ 3167 public void setAddStatesFromChildren(boolean addsStates) { 3168 if (addsStates) { 3169 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 3170 } else { 3171 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 3172 } 3173 3174 refreshDrawableState(); 3175 } 3176 3177 /** 3178 * Returns whether this ViewGroup's drawable states also include 3179 * its children's drawable states. This is used, for example, to 3180 * make a group appear to be focused when its child EditText or button 3181 * is focused. 3182 */ 3183 public boolean addStatesFromChildren() { 3184 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 3185 } 3186 3187 /** 3188 * If {link #addStatesFromChildren} is true, refreshes this group's 3189 * drawable state (to include the states from its children). 3190 */ 3191 public void childDrawableStateChanged(View child) { 3192 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 3193 refreshDrawableState(); 3194 } 3195 } 3196 3197 /** 3198 * Specifies the animation listener to which layout animation events must 3199 * be sent. Only 3200 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 3201 * and 3202 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 3203 * are invoked. 3204 * 3205 * @param animationListener the layout animation listener 3206 */ 3207 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 3208 mAnimationListener = animationListener; 3209 } 3210 3211 /** 3212 * LayoutParams are used by views to tell their parents how they want to be 3213 * laid out. See 3214 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 3215 * for a list of all child view attributes that this class supports. 3216 * 3217 * <p> 3218 * The base LayoutParams class just describes how big the view wants to be 3219 * for both width and height. For each dimension, it can specify one of: 3220 * <ul> 3221 * <li> an exact number 3222 * <li>FILL_PARENT, which means the view wants to be as big as its parent 3223 * (minus padding) 3224 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 3225 * to enclose its content (plus padding) 3226 * </ul> 3227 * There are subclasses of LayoutParams for different subclasses of 3228 * ViewGroup. For example, AbsoluteLayout has its own subclass of 3229 * LayoutParams which adds an X and Y value. 3230 * 3231 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 3232 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 3233 */ 3234 public static class LayoutParams { 3235 /** 3236 * Special value for the height or width requested by a View. 3237 * FILL_PARENT means that the view wants to fill the available space 3238 * within the parent, taking the parent's padding into account. 3239 */ 3240 public static final int FILL_PARENT = -1; 3241 3242 /** 3243 * Special value for the height or width requested by a View. 3244 * WRAP_CONTENT means that the view wants to be just large enough to fit 3245 * its own internal content, taking its own padding into account. 3246 */ 3247 public static final int WRAP_CONTENT = -2; 3248 3249 /** 3250 * Information about how wide the view wants to be. Can be an exact 3251 * size, or one of the constants FILL_PARENT or WRAP_CONTENT. 3252 */ 3253 @ViewDebug.ExportedProperty(mapping = { 3254 @ViewDebug.IntToString(from = FILL_PARENT, to = "FILL_PARENT"), 3255 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3256 }) 3257 public int width; 3258 3259 /** 3260 * Information about how tall the view wants to be. Can be an exact 3261 * size, or one of the constants FILL_PARENT or WRAP_CONTENT. 3262 */ 3263 @ViewDebug.ExportedProperty(mapping = { 3264 @ViewDebug.IntToString(from = FILL_PARENT, to = "FILL_PARENT"), 3265 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 3266 }) 3267 public int height; 3268 3269 /** 3270 * Used to animate layouts. 3271 */ 3272 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 3273 3274 /** 3275 * Creates a new set of layout parameters. The values are extracted from 3276 * the supplied attributes set and context. The XML attributes mapped 3277 * to this set of layout parameters are: 3278 * 3279 * <ul> 3280 * <li><code>layout_width</code>: the width, either an exact value, 3281 * {@link #WRAP_CONTENT} or {@link #FILL_PARENT}</li> 3282 * <li><code>layout_height</code>: the height, either an exact value, 3283 * {@link #WRAP_CONTENT} or {@link #FILL_PARENT}</li> 3284 * </ul> 3285 * 3286 * @param c the application environment 3287 * @param attrs the set of attributes from which to extract the layout 3288 * parameters' values 3289 */ 3290 public LayoutParams(Context c, AttributeSet attrs) { 3291 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 3292 setBaseAttributes(a, 3293 R.styleable.ViewGroup_Layout_layout_width, 3294 R.styleable.ViewGroup_Layout_layout_height); 3295 a.recycle(); 3296 } 3297 3298 /** 3299 * Creates a new set of layout parameters with the specified width 3300 * and height. 3301 * 3302 * @param width the width, either {@link #FILL_PARENT}, 3303 * {@link #WRAP_CONTENT} or a fixed size in pixels 3304 * @param height the height, either {@link #FILL_PARENT}, 3305 * {@link #WRAP_CONTENT} or a fixed size in pixels 3306 */ 3307 public LayoutParams(int width, int height) { 3308 this.width = width; 3309 this.height = height; 3310 } 3311 3312 /** 3313 * Copy constructor. Clones the width and height values of the source. 3314 * 3315 * @param source The layout params to copy from. 3316 */ 3317 public LayoutParams(LayoutParams source) { 3318 this.width = source.width; 3319 this.height = source.height; 3320 } 3321 3322 /** 3323 * Used internally by MarginLayoutParams. 3324 * @hide 3325 */ 3326 LayoutParams() { 3327 } 3328 3329 /** 3330 * Extracts the layout parameters from the supplied attributes. 3331 * 3332 * @param a the style attributes to extract the parameters from 3333 * @param widthAttr the identifier of the width attribute 3334 * @param heightAttr the identifier of the height attribute 3335 */ 3336 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 3337 width = a.getLayoutDimension(widthAttr, "layout_width"); 3338 height = a.getLayoutDimension(heightAttr, "layout_height"); 3339 } 3340 3341 /** 3342 * Returns a String representation of this set of layout parameters. 3343 * 3344 * @param output the String to prepend to the internal representation 3345 * @return a String with the following format: output + 3346 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 3347 * 3348 * @hide 3349 */ 3350 public String debug(String output) { 3351 return output + "ViewGroup.LayoutParams={ width=" 3352 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 3353 } 3354 3355 /** 3356 * Converts the specified size to a readable String. 3357 * 3358 * @param size the size to convert 3359 * @return a String instance representing the supplied size 3360 * 3361 * @hide 3362 */ 3363 protected static String sizeToString(int size) { 3364 if (size == WRAP_CONTENT) { 3365 return "wrap-content"; 3366 } 3367 if (size == FILL_PARENT) { 3368 return "fill-parent"; 3369 } 3370 return String.valueOf(size); 3371 } 3372 } 3373 3374 /** 3375 * Per-child layout information for layouts that support margins. 3376 * See 3377 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 3378 * for a list of all child view attributes that this class supports. 3379 */ 3380 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 3381 /** 3382 * The left margin in pixels of the child. 3383 */ 3384 @ViewDebug.ExportedProperty 3385 public int leftMargin; 3386 3387 /** 3388 * The top margin in pixels of the child. 3389 */ 3390 @ViewDebug.ExportedProperty 3391 public int topMargin; 3392 3393 /** 3394 * The right margin in pixels of the child. 3395 */ 3396 @ViewDebug.ExportedProperty 3397 public int rightMargin; 3398 3399 /** 3400 * The bottom margin in pixels of the child. 3401 */ 3402 @ViewDebug.ExportedProperty 3403 public int bottomMargin; 3404 3405 /** 3406 * Creates a new set of layout parameters. The values are extracted from 3407 * the supplied attributes set and context. 3408 * 3409 * @param c the application environment 3410 * @param attrs the set of attributes from which to extract the layout 3411 * parameters' values 3412 */ 3413 public MarginLayoutParams(Context c, AttributeSet attrs) { 3414 super(); 3415 3416 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 3417 setBaseAttributes(a, 3418 R.styleable.ViewGroup_MarginLayout_layout_width, 3419 R.styleable.ViewGroup_MarginLayout_layout_height); 3420 3421 int margin = a.getDimensionPixelSize( 3422 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 3423 if (margin >= 0) { 3424 leftMargin = margin; 3425 topMargin = margin; 3426 rightMargin= margin; 3427 bottomMargin = margin; 3428 } else { 3429 leftMargin = a.getDimensionPixelSize( 3430 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 3431 topMargin = a.getDimensionPixelSize( 3432 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 3433 rightMargin = a.getDimensionPixelSize( 3434 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 3435 bottomMargin = a.getDimensionPixelSize( 3436 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 3437 } 3438 3439 a.recycle(); 3440 } 3441 3442 /** 3443 * {@inheritDoc} 3444 */ 3445 public MarginLayoutParams(int width, int height) { 3446 super(width, height); 3447 } 3448 3449 /** 3450 * Copy constructor. Clones the width, height and margin values of the source. 3451 * 3452 * @param source The layout params to copy from. 3453 */ 3454 public MarginLayoutParams(MarginLayoutParams source) { 3455 this.width = source.width; 3456 this.height = source.height; 3457 3458 this.leftMargin = source.leftMargin; 3459 this.topMargin = source.topMargin; 3460 this.rightMargin = source.rightMargin; 3461 this.bottomMargin = source.bottomMargin; 3462 } 3463 3464 /** 3465 * {@inheritDoc} 3466 */ 3467 public MarginLayoutParams(LayoutParams source) { 3468 super(source); 3469 } 3470 3471 /** 3472 * Sets the margins, in pixels. 3473 * 3474 * @param left the left margin size 3475 * @param top the top margin size 3476 * @param right the right margin size 3477 * @param bottom the bottom margin size 3478 * 3479 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 3480 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 3481 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 3482 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 3483 */ 3484 public void setMargins(int left, int top, int right, int bottom) { 3485 leftMargin = left; 3486 topMargin = top; 3487 rightMargin = right; 3488 bottomMargin = bottom; 3489 } 3490 } 3491} 3492