ViewGroup.java revision ea5e56ad9c2324dd6fbeab64e031878e03122c40
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.DashPathEffect; 27import android.graphics.Insets; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PathEffect; 31import android.graphics.PointF; 32import android.graphics.Rect; 33import android.graphics.RectF; 34import android.graphics.Region; 35import android.os.Build; 36import android.os.Parcelable; 37import android.os.SystemClock; 38import android.util.AttributeSet; 39import android.util.Log; 40import android.util.SparseArray; 41import android.view.accessibility.AccessibilityEvent; 42import android.view.accessibility.AccessibilityNodeInfo; 43import android.view.animation.Animation; 44import android.view.animation.AnimationUtils; 45import android.view.animation.LayoutAnimationController; 46import android.view.animation.Transformation; 47 48import com.android.internal.R; 49import com.android.internal.util.Predicate; 50 51import java.util.ArrayList; 52import java.util.Collections; 53import java.util.HashSet; 54 55/** 56 * <p> 57 * A <code>ViewGroup</code> is a special view that can contain other views 58 * (called children.) The view group is the base class for layouts and views 59 * containers. This class also defines the 60 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 61 * class for layouts parameters. 62 * </p> 63 * 64 * <p> 65 * Also see {@link LayoutParams} for layout attributes. 66 * </p> 67 * 68 * <div class="special reference"> 69 * <h3>Developer Guides</h3> 70 * <p>For more information about creating user interface layouts, read the 71 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 72 * guide.</p></div> 73 * 74 * @attr ref android.R.styleable#ViewGroup_clipChildren 75 * @attr ref android.R.styleable#ViewGroup_clipToPadding 76 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 77 * @attr ref android.R.styleable#ViewGroup_animationCache 78 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 79 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 80 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 81 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 82 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 83 */ 84public abstract class ViewGroup extends View implements ViewParent, ViewManager { 85 private static final String TAG = "ViewGroup"; 86 87 private static final boolean DBG = false; 88 /** @hide */ 89 public static boolean DEBUG_DRAW = false; 90 91 /** 92 * Views which have been hidden or removed which need to be animated on 93 * their way out. 94 * This field should be made private, so it is hidden from the SDK. 95 * {@hide} 96 */ 97 protected ArrayList<View> mDisappearingChildren; 98 99 /** 100 * Listener used to propagate events indicating when children are added 101 * and/or removed from a view group. 102 * This field should be made private, so it is hidden from the SDK. 103 * {@hide} 104 */ 105 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 106 107 // The view contained within this ViewGroup that has or contains focus. 108 private View mFocused; 109 110 /** 111 * A Transformation used when drawing children, to 112 * apply on the child being drawn. 113 */ 114 final Transformation mChildTransformation = new Transformation(); 115 116 /** 117 * Used to track the current invalidation region. 118 */ 119 RectF mInvalidateRegion; 120 121 /** 122 * A Transformation used to calculate a correct 123 * invalidation area when the application is autoscaled. 124 */ 125 Transformation mInvalidationTransformation; 126 127 // View currently under an ongoing drag 128 private View mCurrentDragView; 129 130 // Metadata about the ongoing drag 131 private DragEvent mCurrentDrag; 132 private HashSet<View> mDragNotifiedChildren; 133 134 // Does this group have a child that can accept the current drag payload? 135 private boolean mChildAcceptsDrag; 136 137 // Used during drag dispatch 138 private final PointF mLocalPoint = new PointF(); 139 140 // Layout animation 141 private LayoutAnimationController mLayoutAnimationController; 142 private Animation.AnimationListener mAnimationListener; 143 144 // First touch target in the linked list of touch targets. 145 private TouchTarget mFirstTouchTarget; 146 147 // For debugging only. You can see these in hierarchyviewer. 148 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 149 @ViewDebug.ExportedProperty(category = "events") 150 private long mLastTouchDownTime; 151 @ViewDebug.ExportedProperty(category = "events") 152 private int mLastTouchDownIndex = -1; 153 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 154 @ViewDebug.ExportedProperty(category = "events") 155 private float mLastTouchDownX; 156 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 157 @ViewDebug.ExportedProperty(category = "events") 158 private float mLastTouchDownY; 159 160 // First hover target in the linked list of hover targets. 161 // The hover targets are children which have received ACTION_HOVER_ENTER. 162 // They might not have actually handled the hover event, but we will 163 // continue sending hover events to them as long as the pointer remains over 164 // their bounds and the view group does not intercept hover. 165 private HoverTarget mFirstHoverTarget; 166 167 // True if the view group itself received a hover event. 168 // It might not have actually handled the hover event. 169 private boolean mHoveredSelf; 170 171 /** 172 * Internal flags. 173 * 174 * This field should be made private, so it is hidden from the SDK. 175 * {@hide} 176 */ 177 @ViewDebug.ExportedProperty(flagMapping = { 178 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 179 name = "CLIP_CHILDREN"), 180 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 181 name = "CLIP_TO_PADDING"), 182 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 183 name = "PADDING_NOT_NULL") 184 }) 185 protected int mGroupFlags; 186 187 /** 188 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 189 */ 190 private int mLayoutMode = DEFAULT_LAYOUT_MODE; 191 192 /** 193 * NOTE: If you change the flags below make sure to reflect the changes 194 * the DisplayList class 195 */ 196 197 // When set, ViewGroup invalidates only the child's rectangle 198 // Set by default 199 static final int FLAG_CLIP_CHILDREN = 0x1; 200 201 // When set, ViewGroup excludes the padding area from the invalidate rectangle 202 // Set by default 203 private static final int FLAG_CLIP_TO_PADDING = 0x2; 204 205 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 206 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 207 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 208 209 // When set, dispatchDraw() will run the layout animation and unset the flag 210 private static final int FLAG_RUN_ANIMATION = 0x8; 211 212 // When set, there is either no layout animation on the ViewGroup or the layout 213 // animation is over 214 // Set by default 215 static final int FLAG_ANIMATION_DONE = 0x10; 216 217 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 218 // to clip it, even if FLAG_CLIP_TO_PADDING is set 219 private static final int FLAG_PADDING_NOT_NULL = 0x20; 220 221 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 222 // Set by default 223 private static final int FLAG_ANIMATION_CACHE = 0x40; 224 225 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 226 // layout animation; this avoid clobbering the hierarchy 227 // Automatically set when the layout animation starts, depending on the animation's 228 // characteristics 229 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 230 231 // When set, the next call to drawChild() will clear mChildTransformation's matrix 232 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 233 234 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 235 // the children's Bitmap caches if necessary 236 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 237 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 238 239 /** 240 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 241 * to get the index of the child to draw for that iteration. 242 * 243 * @hide 244 */ 245 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 246 247 /** 248 * When set, this ViewGroup supports static transformations on children; this causes 249 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 250 * invoked when a child is drawn. 251 * 252 * Any subclass overriding 253 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 254 * set this flags in {@link #mGroupFlags}. 255 * 256 * {@hide} 257 */ 258 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 259 260 // When the previous drawChild() invocation used an alpha value that was lower than 261 // 1.0 and set it in mCachePaint 262 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 263 264 /** 265 * When set, this ViewGroup's drawable states also include those 266 * of its children. 267 */ 268 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 269 270 /** 271 * When set, this ViewGroup tries to always draw its children using their drawing cache. 272 */ 273 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 274 275 /** 276 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 277 * draw its children with their drawing cache. 278 */ 279 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 280 281 /** 282 * When set, this group will go through its list of children to notify them of 283 * any drawable state change. 284 */ 285 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 286 287 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 288 289 /** 290 * This view will get focus before any of its descendants. 291 */ 292 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 293 294 /** 295 * This view will get focus only if none of its descendants want it. 296 */ 297 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 298 299 /** 300 * This view will block any of its descendants from getting focus, even 301 * if they are focusable. 302 */ 303 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 304 305 /** 306 * Used to map between enum in attrubutes and flag values. 307 */ 308 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 309 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 310 FOCUS_BLOCK_DESCENDANTS}; 311 312 /** 313 * When set, this ViewGroup should not intercept touch events. 314 * {@hide} 315 */ 316 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 317 318 /** 319 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 320 */ 321 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 322 323 /** 324 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 325 * to children when adding new views. This is used to prevent multiple 326 * onAttached calls when a ViewGroup adds children in its own onAttached method. 327 */ 328 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 329 330 /** 331 * Indicates which types of drawing caches are to be kept in memory. 332 * This field should be made private, so it is hidden from the SDK. 333 * {@hide} 334 */ 335 protected int mPersistentDrawingCache; 336 337 /** 338 * Used to indicate that no drawing cache should be kept in memory. 339 */ 340 public static final int PERSISTENT_NO_CACHE = 0x0; 341 342 /** 343 * Used to indicate that the animation drawing cache should be kept in memory. 344 */ 345 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 346 347 /** 348 * Used to indicate that the scrolling drawing cache should be kept in memory. 349 */ 350 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 351 352 /** 353 * Used to indicate that all drawing caches should be kept in memory. 354 */ 355 public static final int PERSISTENT_ALL_CACHES = 0x3; 356 357 // Layout Modes 358 359 /** 360 * This constant is a {@link #setLayoutMode(int) layoutMode}. 361 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 362 * {@link #getRight() right} and {@link #getBottom() bottom}. 363 */ 364 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 365 366 /** 367 * This constant is a {@link #setLayoutMode(int) layoutMode}. 368 * Optical bounds describe where a widget appears to be. They sit inside the clip 369 * bounds which need to cover a larger area to allow other effects, 370 * such as shadows and glows, to be drawn. 371 */ 372 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 373 374 /** @hide */ 375 public static int DEFAULT_LAYOUT_MODE = LAYOUT_MODE_CLIP_BOUNDS; 376 377 /** 378 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 379 * are set at the same time. 380 */ 381 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 382 383 // Index of the child's left position in the mLocation array 384 private static final int CHILD_LEFT_INDEX = 0; 385 // Index of the child's top position in the mLocation array 386 private static final int CHILD_TOP_INDEX = 1; 387 388 // Child views of this ViewGroup 389 private View[] mChildren; 390 // Number of valid children in the mChildren array, the rest should be null or not 391 // considered as children 392 393 private boolean mLayoutSuppressed = false; 394 395 private int mChildrenCount; 396 397 private static final int ARRAY_INITIAL_CAPACITY = 12; 398 private static final int ARRAY_CAPACITY_INCREMENT = 12; 399 400 private static Paint sDebugPaint; 401 private static float[] sDebugLines; 402 403 // Used to draw cached views 404 Paint mCachePaint; 405 406 // Used to animate add/remove changes in layout 407 private LayoutTransition mTransition; 408 409 // The set of views that are currently being transitioned. This list is used to track views 410 // being removed that should not actually be removed from the parent yet because they are 411 // being animated. 412 private ArrayList<View> mTransitioningViews; 413 414 // List of children changing visibility. This is used to potentially keep rendering 415 // views during a transition when they otherwise would have become gone/invisible 416 private ArrayList<View> mVisibilityChangingChildren; 417 418 // Indicates how many of this container's child subtrees contain transient state 419 @ViewDebug.ExportedProperty(category = "layout") 420 private int mChildCountWithTransientState = 0; 421 422 public ViewGroup(Context context) { 423 super(context); 424 initViewGroup(); 425 } 426 427 public ViewGroup(Context context, AttributeSet attrs) { 428 super(context, attrs); 429 initViewGroup(); 430 initFromAttributes(context, attrs); 431 } 432 433 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 434 super(context, attrs, defStyle); 435 initViewGroup(); 436 initFromAttributes(context, attrs); 437 } 438 439 private boolean debugDraw() { 440 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 441 } 442 443 private void initViewGroup() { 444 // ViewGroup doesn't draw by default 445 if (!debugDraw()) { 446 setFlags(WILL_NOT_DRAW, DRAW_MASK); 447 } 448 mGroupFlags |= FLAG_CLIP_CHILDREN; 449 mGroupFlags |= FLAG_CLIP_TO_PADDING; 450 mGroupFlags |= FLAG_ANIMATION_DONE; 451 mGroupFlags |= FLAG_ANIMATION_CACHE; 452 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 453 454 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 455 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 456 } 457 458 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 459 460 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 461 mChildrenCount = 0; 462 463 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 464 } 465 466 private void initFromAttributes(Context context, AttributeSet attrs) { 467 TypedArray a = context.obtainStyledAttributes(attrs, 468 R.styleable.ViewGroup); 469 470 final int N = a.getIndexCount(); 471 for (int i = 0; i < N; i++) { 472 int attr = a.getIndex(i); 473 switch (attr) { 474 case R.styleable.ViewGroup_clipChildren: 475 setClipChildren(a.getBoolean(attr, true)); 476 break; 477 case R.styleable.ViewGroup_clipToPadding: 478 setClipToPadding(a.getBoolean(attr, true)); 479 break; 480 case R.styleable.ViewGroup_animationCache: 481 setAnimationCacheEnabled(a.getBoolean(attr, true)); 482 break; 483 case R.styleable.ViewGroup_persistentDrawingCache: 484 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 485 break; 486 case R.styleable.ViewGroup_addStatesFromChildren: 487 setAddStatesFromChildren(a.getBoolean(attr, false)); 488 break; 489 case R.styleable.ViewGroup_alwaysDrawnWithCache: 490 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 491 break; 492 case R.styleable.ViewGroup_layoutAnimation: 493 int id = a.getResourceId(attr, -1); 494 if (id > 0) { 495 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 496 } 497 break; 498 case R.styleable.ViewGroup_descendantFocusability: 499 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 500 break; 501 case R.styleable.ViewGroup_splitMotionEvents: 502 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 503 break; 504 case R.styleable.ViewGroup_animateLayoutChanges: 505 boolean animateLayoutChanges = a.getBoolean(attr, false); 506 if (animateLayoutChanges) { 507 setLayoutTransition(new LayoutTransition()); 508 } 509 break; 510 case R.styleable.ViewGroup_layoutMode: 511 setLayoutMode(a.getInt(attr, DEFAULT_LAYOUT_MODE)); 512 break; 513 } 514 } 515 516 a.recycle(); 517 } 518 519 /** 520 * Gets the descendant focusability of this view group. The descendant 521 * focusability defines the relationship between this view group and its 522 * descendants when looking for a view to take focus in 523 * {@link #requestFocus(int, android.graphics.Rect)}. 524 * 525 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 526 * {@link #FOCUS_BLOCK_DESCENDANTS}. 527 */ 528 @ViewDebug.ExportedProperty(category = "focus", mapping = { 529 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 530 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 531 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 532 }) 533 public int getDescendantFocusability() { 534 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 535 } 536 537 /** 538 * Set the descendant focusability of this view group. This defines the relationship 539 * between this view group and its descendants when looking for a view to 540 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 541 * 542 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 543 * {@link #FOCUS_BLOCK_DESCENDANTS}. 544 */ 545 public void setDescendantFocusability(int focusability) { 546 switch (focusability) { 547 case FOCUS_BEFORE_DESCENDANTS: 548 case FOCUS_AFTER_DESCENDANTS: 549 case FOCUS_BLOCK_DESCENDANTS: 550 break; 551 default: 552 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 553 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 554 } 555 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 556 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 557 } 558 559 /** 560 * {@inheritDoc} 561 */ 562 @Override 563 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 564 if (mFocused != null) { 565 mFocused.unFocus(); 566 mFocused = null; 567 } 568 super.handleFocusGainInternal(direction, previouslyFocusedRect); 569 } 570 571 /** 572 * {@inheritDoc} 573 */ 574 public void requestChildFocus(View child, View focused) { 575 if (DBG) { 576 System.out.println(this + " requestChildFocus()"); 577 } 578 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 579 return; 580 } 581 582 // Unfocus us, if necessary 583 super.unFocus(); 584 585 // We had a previous notion of who had focus. Clear it. 586 if (mFocused != child) { 587 if (mFocused != null) { 588 mFocused.unFocus(); 589 } 590 591 mFocused = child; 592 } 593 if (mParent != null) { 594 mParent.requestChildFocus(this, focused); 595 } 596 } 597 598 /** 599 * {@inheritDoc} 600 */ 601 public void focusableViewAvailable(View v) { 602 if (mParent != null 603 // shortcut: don't report a new focusable view if we block our descendants from 604 // getting focus 605 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 606 // shortcut: don't report a new focusable view if we already are focused 607 // (and we don't prefer our descendants) 608 // 609 // note: knowing that mFocused is non-null is not a good enough reason 610 // to break the traversal since in that case we'd actually have to find 611 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 612 // an ancestor of v; this will get checked for at ViewAncestor 613 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 614 mParent.focusableViewAvailable(v); 615 } 616 } 617 618 /** 619 * {@inheritDoc} 620 */ 621 public boolean showContextMenuForChild(View originalView) { 622 return mParent != null && mParent.showContextMenuForChild(originalView); 623 } 624 625 /** 626 * {@inheritDoc} 627 */ 628 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 629 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 630 } 631 632 /** 633 * Find the nearest view in the specified direction that wants to take 634 * focus. 635 * 636 * @param focused The view that currently has focus 637 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 638 * FOCUS_RIGHT, or 0 for not applicable. 639 */ 640 public View focusSearch(View focused, int direction) { 641 if (isRootNamespace()) { 642 // root namespace means we should consider ourselves the top of the 643 // tree for focus searching; otherwise we could be focus searching 644 // into other tabs. see LocalActivityManager and TabHost for more info 645 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 646 } else if (mParent != null) { 647 return mParent.focusSearch(focused, direction); 648 } 649 return null; 650 } 651 652 /** 653 * {@inheritDoc} 654 */ 655 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 656 return false; 657 } 658 659 /** 660 * {@inheritDoc} 661 */ 662 @Override 663 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 664 ViewParent parent = mParent; 665 if (parent == null) { 666 return false; 667 } 668 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 669 if (!propagate) { 670 return false; 671 } 672 return parent.requestSendAccessibilityEvent(this, event); 673 } 674 675 /** 676 * Called when a child has requested sending an {@link AccessibilityEvent} and 677 * gives an opportunity to its parent to augment the event. 678 * <p> 679 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 680 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 681 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 682 * is responsible for handling this call. 683 * </p> 684 * 685 * @param child The child which requests sending the event. 686 * @param event The event to be sent. 687 * @return True if the event should be sent. 688 * 689 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 690 */ 691 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 692 if (mAccessibilityDelegate != null) { 693 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 694 } else { 695 return onRequestSendAccessibilityEventInternal(child, event); 696 } 697 } 698 699 /** 700 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 701 * 702 * Note: Called from the default {@link View.AccessibilityDelegate}. 703 */ 704 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 705 return true; 706 } 707 708 /** 709 * Called when a child view has changed whether or not it is tracking transient state. 710 * 711 * @hide 712 */ 713 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 714 final boolean oldHasTransientState = hasTransientState(); 715 if (childHasTransientState) { 716 mChildCountWithTransientState++; 717 } else { 718 mChildCountWithTransientState--; 719 } 720 721 final boolean newHasTransientState = hasTransientState(); 722 if (mParent != null && oldHasTransientState != newHasTransientState) { 723 try { 724 mParent.childHasTransientStateChanged(this, newHasTransientState); 725 } catch (AbstractMethodError e) { 726 Log.e(TAG, mParent.getClass().getSimpleName() + 727 " does not fully implement ViewParent", e); 728 } 729 } 730 } 731 732 /** 733 * @hide 734 */ 735 @Override 736 public boolean hasTransientState() { 737 return mChildCountWithTransientState > 0 || super.hasTransientState(); 738 } 739 740 /** 741 * {@inheritDoc} 742 */ 743 @Override 744 public boolean dispatchUnhandledMove(View focused, int direction) { 745 return mFocused != null && 746 mFocused.dispatchUnhandledMove(focused, direction); 747 } 748 749 /** 750 * {@inheritDoc} 751 */ 752 public void clearChildFocus(View child) { 753 if (DBG) { 754 System.out.println(this + " clearChildFocus()"); 755 } 756 757 mFocused = null; 758 if (mParent != null) { 759 mParent.clearChildFocus(this); 760 } 761 } 762 763 /** 764 * {@inheritDoc} 765 */ 766 @Override 767 public void clearFocus() { 768 if (DBG) { 769 System.out.println(this + " clearFocus()"); 770 } 771 if (mFocused == null) { 772 super.clearFocus(); 773 } else { 774 View focused = mFocused; 775 mFocused = null; 776 focused.clearFocus(); 777 } 778 } 779 780 /** 781 * {@inheritDoc} 782 */ 783 @Override 784 void unFocus() { 785 if (DBG) { 786 System.out.println(this + " unFocus()"); 787 } 788 if (mFocused == null) { 789 super.unFocus(); 790 } else { 791 mFocused.unFocus(); 792 mFocused = null; 793 } 794 } 795 796 /** 797 * Returns the focused child of this view, if any. The child may have focus 798 * or contain focus. 799 * 800 * @return the focused child or null. 801 */ 802 public View getFocusedChild() { 803 return mFocused; 804 } 805 806 /** 807 * Returns true if this view has or contains focus 808 * 809 * @return true if this view has or contains focus 810 */ 811 @Override 812 public boolean hasFocus() { 813 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 814 } 815 816 /* 817 * (non-Javadoc) 818 * 819 * @see android.view.View#findFocus() 820 */ 821 @Override 822 public View findFocus() { 823 if (DBG) { 824 System.out.println("Find focus in " + this + ": flags=" 825 + isFocused() + ", child=" + mFocused); 826 } 827 828 if (isFocused()) { 829 return this; 830 } 831 832 if (mFocused != null) { 833 return mFocused.findFocus(); 834 } 835 return null; 836 } 837 838 /** 839 * {@inheritDoc} 840 */ 841 @Override 842 public boolean hasFocusable() { 843 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 844 return false; 845 } 846 847 if (isFocusable()) { 848 return true; 849 } 850 851 final int descendantFocusability = getDescendantFocusability(); 852 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 853 final int count = mChildrenCount; 854 final View[] children = mChildren; 855 856 for (int i = 0; i < count; i++) { 857 final View child = children[i]; 858 if (child.hasFocusable()) { 859 return true; 860 } 861 } 862 } 863 864 return false; 865 } 866 867 /** 868 * {@inheritDoc} 869 */ 870 @Override 871 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 872 final int focusableCount = views.size(); 873 874 final int descendantFocusability = getDescendantFocusability(); 875 876 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 877 final int count = mChildrenCount; 878 final View[] children = mChildren; 879 880 for (int i = 0; i < count; i++) { 881 final View child = children[i]; 882 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 883 child.addFocusables(views, direction, focusableMode); 884 } 885 } 886 } 887 888 // we add ourselves (if focusable) in all cases except for when we are 889 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 890 // to avoid the focus search finding layouts when a more precise search 891 // among the focusable children would be more interesting. 892 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 893 // No focusable descendants 894 || (focusableCount == views.size())) { 895 super.addFocusables(views, direction, focusableMode); 896 } 897 } 898 899 @Override 900 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 901 super.findViewsWithText(outViews, text, flags); 902 final int childrenCount = mChildrenCount; 903 final View[] children = mChildren; 904 for (int i = 0; i < childrenCount; i++) { 905 View child = children[i]; 906 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 907 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 908 child.findViewsWithText(outViews, text, flags); 909 } 910 } 911 } 912 913 @Override 914 View findViewByAccessibilityIdTraversal(int accessibilityId) { 915 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 916 if (foundView != null) { 917 return foundView; 918 } 919 final int childrenCount = mChildrenCount; 920 final View[] children = mChildren; 921 for (int i = 0; i < childrenCount; i++) { 922 View child = children[i]; 923 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 924 if (foundView != null) { 925 return foundView; 926 } 927 } 928 return null; 929 } 930 931 /** 932 * {@inheritDoc} 933 */ 934 @Override 935 public void dispatchWindowFocusChanged(boolean hasFocus) { 936 super.dispatchWindowFocusChanged(hasFocus); 937 final int count = mChildrenCount; 938 final View[] children = mChildren; 939 for (int i = 0; i < count; i++) { 940 children[i].dispatchWindowFocusChanged(hasFocus); 941 } 942 } 943 944 /** 945 * {@inheritDoc} 946 */ 947 @Override 948 public void addTouchables(ArrayList<View> views) { 949 super.addTouchables(views); 950 951 final int count = mChildrenCount; 952 final View[] children = mChildren; 953 954 for (int i = 0; i < count; i++) { 955 final View child = children[i]; 956 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 957 child.addTouchables(views); 958 } 959 } 960 } 961 962 /** 963 * @hide 964 */ 965 @Override 966 public void makeOptionalFitsSystemWindows() { 967 super.makeOptionalFitsSystemWindows(); 968 final int count = mChildrenCount; 969 final View[] children = mChildren; 970 for (int i = 0; i < count; i++) { 971 children[i].makeOptionalFitsSystemWindows(); 972 } 973 } 974 975 /** 976 * {@inheritDoc} 977 */ 978 @Override 979 public void dispatchDisplayHint(int hint) { 980 super.dispatchDisplayHint(hint); 981 final int count = mChildrenCount; 982 final View[] children = mChildren; 983 for (int i = 0; i < count; i++) { 984 children[i].dispatchDisplayHint(hint); 985 } 986 } 987 988 /** 989 * Called when a view's visibility has changed. Notify the parent to take any appropriate 990 * action. 991 * 992 * @param child The view whose visibility has changed 993 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 994 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 995 * @hide 996 */ 997 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 998 if (mTransition != null) { 999 if (newVisibility == VISIBLE) { 1000 mTransition.showChild(this, child, oldVisibility); 1001 } else { 1002 mTransition.hideChild(this, child, newVisibility); 1003 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1004 // Only track this on disappearing views - appearing views are already visible 1005 // and don't need special handling during drawChild() 1006 if (mVisibilityChangingChildren == null) { 1007 mVisibilityChangingChildren = new ArrayList<View>(); 1008 } 1009 mVisibilityChangingChildren.add(child); 1010 addDisappearingView(child); 1011 } 1012 } 1013 } 1014 1015 // in all cases, for drags 1016 if (mCurrentDrag != null) { 1017 if (newVisibility == VISIBLE) { 1018 notifyChildOfDrag(child); 1019 } 1020 } 1021 } 1022 1023 /** 1024 * {@inheritDoc} 1025 */ 1026 @Override 1027 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1028 super.dispatchVisibilityChanged(changedView, visibility); 1029 final int count = mChildrenCount; 1030 final View[] children = mChildren; 1031 for (int i = 0; i < count; i++) { 1032 children[i].dispatchVisibilityChanged(changedView, visibility); 1033 } 1034 } 1035 1036 /** 1037 * {@inheritDoc} 1038 */ 1039 @Override 1040 public void dispatchWindowVisibilityChanged(int visibility) { 1041 super.dispatchWindowVisibilityChanged(visibility); 1042 final int count = mChildrenCount; 1043 final View[] children = mChildren; 1044 for (int i = 0; i < count; i++) { 1045 children[i].dispatchWindowVisibilityChanged(visibility); 1046 } 1047 } 1048 1049 /** 1050 * {@inheritDoc} 1051 */ 1052 @Override 1053 public void dispatchConfigurationChanged(Configuration newConfig) { 1054 super.dispatchConfigurationChanged(newConfig); 1055 final int count = mChildrenCount; 1056 final View[] children = mChildren; 1057 for (int i = 0; i < count; i++) { 1058 children[i].dispatchConfigurationChanged(newConfig); 1059 } 1060 } 1061 1062 /** 1063 * {@inheritDoc} 1064 */ 1065 public void recomputeViewAttributes(View child) { 1066 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1067 ViewParent parent = mParent; 1068 if (parent != null) parent.recomputeViewAttributes(this); 1069 } 1070 } 1071 1072 @Override 1073 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1074 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1075 super.dispatchCollectViewAttributes(attachInfo, visibility); 1076 final int count = mChildrenCount; 1077 final View[] children = mChildren; 1078 for (int i = 0; i < count; i++) { 1079 final View child = children[i]; 1080 child.dispatchCollectViewAttributes(attachInfo, 1081 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1082 } 1083 } 1084 } 1085 1086 /** 1087 * {@inheritDoc} 1088 */ 1089 public void bringChildToFront(View child) { 1090 int index = indexOfChild(child); 1091 if (index >= 0) { 1092 removeFromArray(index); 1093 addInArray(child, mChildrenCount); 1094 child.mParent = this; 1095 } 1096 } 1097 1098 /** 1099 * {@inheritDoc} 1100 */ 1101 // TODO: Write real docs 1102 @Override 1103 public boolean dispatchDragEvent(DragEvent event) { 1104 boolean retval = false; 1105 final float tx = event.mX; 1106 final float ty = event.mY; 1107 1108 ViewRootImpl root = getViewRootImpl(); 1109 1110 // Dispatch down the view hierarchy 1111 switch (event.mAction) { 1112 case DragEvent.ACTION_DRAG_STARTED: { 1113 // clear state to recalculate which views we drag over 1114 mCurrentDragView = null; 1115 1116 // Set up our tracking of drag-started notifications 1117 mCurrentDrag = DragEvent.obtain(event); 1118 if (mDragNotifiedChildren == null) { 1119 mDragNotifiedChildren = new HashSet<View>(); 1120 } else { 1121 mDragNotifiedChildren.clear(); 1122 } 1123 1124 // Now dispatch down to our children, caching the responses 1125 mChildAcceptsDrag = false; 1126 final int count = mChildrenCount; 1127 final View[] children = mChildren; 1128 for (int i = 0; i < count; i++) { 1129 final View child = children[i]; 1130 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1131 if (child.getVisibility() == VISIBLE) { 1132 final boolean handled = notifyChildOfDrag(children[i]); 1133 if (handled) { 1134 mChildAcceptsDrag = true; 1135 } 1136 } 1137 } 1138 1139 // Return HANDLED if one of our children can accept the drag 1140 if (mChildAcceptsDrag) { 1141 retval = true; 1142 } 1143 } break; 1144 1145 case DragEvent.ACTION_DRAG_ENDED: { 1146 // Release the bookkeeping now that the drag lifecycle has ended 1147 if (mDragNotifiedChildren != null) { 1148 for (View child : mDragNotifiedChildren) { 1149 // If a child was notified about an ongoing drag, it's told that it's over 1150 child.dispatchDragEvent(event); 1151 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1152 child.refreshDrawableState(); 1153 } 1154 1155 mDragNotifiedChildren.clear(); 1156 mCurrentDrag.recycle(); 1157 mCurrentDrag = null; 1158 } 1159 1160 // We consider drag-ended to have been handled if one of our children 1161 // had offered to handle the drag. 1162 if (mChildAcceptsDrag) { 1163 retval = true; 1164 } 1165 } break; 1166 1167 case DragEvent.ACTION_DRAG_LOCATION: { 1168 // Find the [possibly new] drag target 1169 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1170 1171 // If we've changed apparent drag target, tell the view root which view 1172 // we're over now [for purposes of the eventual drag-recipient-changed 1173 // notifications to the framework] and tell the new target that the drag 1174 // has entered its bounds. The root will see setDragFocus() calls all 1175 // the way down to the final leaf view that is handling the LOCATION event 1176 // before reporting the new potential recipient to the framework. 1177 if (mCurrentDragView != target) { 1178 root.setDragFocus(target); 1179 1180 final int action = event.mAction; 1181 // If we've dragged off of a child view, send it the EXITED message 1182 if (mCurrentDragView != null) { 1183 final View view = mCurrentDragView; 1184 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1185 view.dispatchDragEvent(event); 1186 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1187 view.refreshDrawableState(); 1188 } 1189 mCurrentDragView = target; 1190 1191 // If we've dragged over a new child view, send it the ENTERED message 1192 if (target != null) { 1193 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1194 target.dispatchDragEvent(event); 1195 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1196 target.refreshDrawableState(); 1197 } 1198 event.mAction = action; // restore the event's original state 1199 } 1200 1201 // Dispatch the actual drag location notice, localized into its coordinates 1202 if (target != null) { 1203 event.mX = mLocalPoint.x; 1204 event.mY = mLocalPoint.y; 1205 1206 retval = target.dispatchDragEvent(event); 1207 1208 event.mX = tx; 1209 event.mY = ty; 1210 } 1211 } break; 1212 1213 /* Entered / exited dispatch 1214 * 1215 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1216 * that we're about to get the corresponding LOCATION event, which we will use to 1217 * determine which of our children is the new target; at that point we will 1218 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1219 * 1220 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1221 * drag has left this ViewGroup, we know by definition that every contained subview 1222 * is also no longer under the drag point. 1223 */ 1224 1225 case DragEvent.ACTION_DRAG_EXITED: { 1226 if (mCurrentDragView != null) { 1227 final View view = mCurrentDragView; 1228 view.dispatchDragEvent(event); 1229 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1230 view.refreshDrawableState(); 1231 1232 mCurrentDragView = null; 1233 } 1234 } break; 1235 1236 case DragEvent.ACTION_DROP: { 1237 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1238 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1239 if (target != null) { 1240 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1241 event.mX = mLocalPoint.x; 1242 event.mY = mLocalPoint.y; 1243 retval = target.dispatchDragEvent(event); 1244 event.mX = tx; 1245 event.mY = ty; 1246 } else { 1247 if (ViewDebug.DEBUG_DRAG) { 1248 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1249 } 1250 } 1251 } break; 1252 } 1253 1254 // If none of our children could handle the event, try here 1255 if (!retval) { 1256 // Call up to the View implementation that dispatches to installed listeners 1257 retval = super.dispatchDragEvent(event); 1258 } 1259 return retval; 1260 } 1261 1262 // Find the frontmost child view that lies under the given point, and calculate 1263 // the position within its own local coordinate system. 1264 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1265 final int count = mChildrenCount; 1266 final View[] children = mChildren; 1267 for (int i = count - 1; i >= 0; i--) { 1268 final View child = children[i]; 1269 if (!child.canAcceptDrag()) { 1270 continue; 1271 } 1272 1273 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1274 return child; 1275 } 1276 } 1277 return null; 1278 } 1279 1280 boolean notifyChildOfDrag(View child) { 1281 if (ViewDebug.DEBUG_DRAG) { 1282 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1283 } 1284 1285 boolean canAccept = false; 1286 if (! mDragNotifiedChildren.contains(child)) { 1287 mDragNotifiedChildren.add(child); 1288 canAccept = child.dispatchDragEvent(mCurrentDrag); 1289 if (canAccept && !child.canAcceptDrag()) { 1290 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1291 child.refreshDrawableState(); 1292 } 1293 } 1294 return canAccept; 1295 } 1296 1297 @Override 1298 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1299 super.dispatchWindowSystemUiVisiblityChanged(visible); 1300 1301 final int count = mChildrenCount; 1302 final View[] children = mChildren; 1303 for (int i=0; i <count; i++) { 1304 final View child = children[i]; 1305 child.dispatchWindowSystemUiVisiblityChanged(visible); 1306 } 1307 } 1308 1309 @Override 1310 public void dispatchSystemUiVisibilityChanged(int visible) { 1311 super.dispatchSystemUiVisibilityChanged(visible); 1312 1313 final int count = mChildrenCount; 1314 final View[] children = mChildren; 1315 for (int i=0; i <count; i++) { 1316 final View child = children[i]; 1317 child.dispatchSystemUiVisibilityChanged(visible); 1318 } 1319 } 1320 1321 @Override 1322 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1323 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1324 1325 final int count = mChildrenCount; 1326 final View[] children = mChildren; 1327 for (int i=0; i <count; i++) { 1328 final View child = children[i]; 1329 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1330 } 1331 return changed; 1332 } 1333 1334 /** 1335 * {@inheritDoc} 1336 */ 1337 @Override 1338 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1339 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1340 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1341 return super.dispatchKeyEventPreIme(event); 1342 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1343 == PFLAG_HAS_BOUNDS) { 1344 return mFocused.dispatchKeyEventPreIme(event); 1345 } 1346 return false; 1347 } 1348 1349 /** 1350 * {@inheritDoc} 1351 */ 1352 @Override 1353 public boolean dispatchKeyEvent(KeyEvent event) { 1354 if (mInputEventConsistencyVerifier != null) { 1355 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1356 } 1357 1358 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1359 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1360 if (super.dispatchKeyEvent(event)) { 1361 return true; 1362 } 1363 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1364 == PFLAG_HAS_BOUNDS) { 1365 if (mFocused.dispatchKeyEvent(event)) { 1366 return true; 1367 } 1368 } 1369 1370 if (mInputEventConsistencyVerifier != null) { 1371 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1372 } 1373 return false; 1374 } 1375 1376 /** 1377 * {@inheritDoc} 1378 */ 1379 @Override 1380 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1381 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1382 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1383 return super.dispatchKeyShortcutEvent(event); 1384 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1385 == PFLAG_HAS_BOUNDS) { 1386 return mFocused.dispatchKeyShortcutEvent(event); 1387 } 1388 return false; 1389 } 1390 1391 /** 1392 * {@inheritDoc} 1393 */ 1394 @Override 1395 public boolean dispatchTrackballEvent(MotionEvent event) { 1396 if (mInputEventConsistencyVerifier != null) { 1397 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1398 } 1399 1400 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1401 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1402 if (super.dispatchTrackballEvent(event)) { 1403 return true; 1404 } 1405 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1406 == PFLAG_HAS_BOUNDS) { 1407 if (mFocused.dispatchTrackballEvent(event)) { 1408 return true; 1409 } 1410 } 1411 1412 if (mInputEventConsistencyVerifier != null) { 1413 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1414 } 1415 return false; 1416 } 1417 1418 /** 1419 * {@inheritDoc} 1420 */ 1421 @SuppressWarnings({"ConstantConditions"}) 1422 @Override 1423 protected boolean dispatchHoverEvent(MotionEvent event) { 1424 final int action = event.getAction(); 1425 1426 // First check whether the view group wants to intercept the hover event. 1427 final boolean interceptHover = onInterceptHoverEvent(event); 1428 event.setAction(action); // restore action in case it was changed 1429 1430 MotionEvent eventNoHistory = event; 1431 boolean handled = false; 1432 1433 // Send events to the hovered children and build a new list of hover targets until 1434 // one is found that handles the event. 1435 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1436 mFirstHoverTarget = null; 1437 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1438 final float x = event.getX(); 1439 final float y = event.getY(); 1440 final int childrenCount = mChildrenCount; 1441 if (childrenCount != 0) { 1442 final View[] children = mChildren; 1443 HoverTarget lastHoverTarget = null; 1444 for (int i = childrenCount - 1; i >= 0; i--) { 1445 final View child = children[i]; 1446 if (!canViewReceivePointerEvents(child) 1447 || !isTransformedTouchPointInView(x, y, child, null)) { 1448 continue; 1449 } 1450 1451 // Obtain a hover target for this child. Dequeue it from the 1452 // old hover target list if the child was previously hovered. 1453 HoverTarget hoverTarget = firstOldHoverTarget; 1454 final boolean wasHovered; 1455 for (HoverTarget predecessor = null; ;) { 1456 if (hoverTarget == null) { 1457 hoverTarget = HoverTarget.obtain(child); 1458 wasHovered = false; 1459 break; 1460 } 1461 1462 if (hoverTarget.child == child) { 1463 if (predecessor != null) { 1464 predecessor.next = hoverTarget.next; 1465 } else { 1466 firstOldHoverTarget = hoverTarget.next; 1467 } 1468 hoverTarget.next = null; 1469 wasHovered = true; 1470 break; 1471 } 1472 1473 predecessor = hoverTarget; 1474 hoverTarget = hoverTarget.next; 1475 } 1476 1477 // Enqueue the hover target onto the new hover target list. 1478 if (lastHoverTarget != null) { 1479 lastHoverTarget.next = hoverTarget; 1480 } else { 1481 lastHoverTarget = hoverTarget; 1482 mFirstHoverTarget = hoverTarget; 1483 } 1484 1485 // Dispatch the event to the child. 1486 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1487 if (!wasHovered) { 1488 // Send the enter as is. 1489 handled |= dispatchTransformedGenericPointerEvent( 1490 event, child); // enter 1491 } 1492 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1493 if (!wasHovered) { 1494 // Synthesize an enter from a move. 1495 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1496 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1497 handled |= dispatchTransformedGenericPointerEvent( 1498 eventNoHistory, child); // enter 1499 eventNoHistory.setAction(action); 1500 1501 handled |= dispatchTransformedGenericPointerEvent( 1502 eventNoHistory, child); // move 1503 } else { 1504 // Send the move as is. 1505 handled |= dispatchTransformedGenericPointerEvent(event, child); 1506 } 1507 } 1508 if (handled) { 1509 break; 1510 } 1511 } 1512 } 1513 } 1514 1515 // Send exit events to all previously hovered children that are no longer hovered. 1516 while (firstOldHoverTarget != null) { 1517 final View child = firstOldHoverTarget.child; 1518 1519 // Exit the old hovered child. 1520 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1521 // Send the exit as is. 1522 handled |= dispatchTransformedGenericPointerEvent( 1523 event, child); // exit 1524 } else { 1525 // Synthesize an exit from a move or enter. 1526 // Ignore the result because hover focus has moved to a different view. 1527 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1528 dispatchTransformedGenericPointerEvent( 1529 event, child); // move 1530 } 1531 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1532 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1533 dispatchTransformedGenericPointerEvent( 1534 eventNoHistory, child); // exit 1535 eventNoHistory.setAction(action); 1536 } 1537 1538 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1539 firstOldHoverTarget.recycle(); 1540 firstOldHoverTarget = nextOldHoverTarget; 1541 } 1542 1543 // Send events to the view group itself if no children have handled it. 1544 boolean newHoveredSelf = !handled; 1545 if (newHoveredSelf == mHoveredSelf) { 1546 if (newHoveredSelf) { 1547 // Send event to the view group as before. 1548 handled |= super.dispatchHoverEvent(event); 1549 } 1550 } else { 1551 if (mHoveredSelf) { 1552 // Exit the view group. 1553 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1554 // Send the exit as is. 1555 handled |= super.dispatchHoverEvent(event); // exit 1556 } else { 1557 // Synthesize an exit from a move or enter. 1558 // Ignore the result because hover focus is moving to a different view. 1559 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1560 super.dispatchHoverEvent(event); // move 1561 } 1562 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1563 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1564 super.dispatchHoverEvent(eventNoHistory); // exit 1565 eventNoHistory.setAction(action); 1566 } 1567 mHoveredSelf = false; 1568 } 1569 1570 if (newHoveredSelf) { 1571 // Enter the view group. 1572 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1573 // Send the enter as is. 1574 handled |= super.dispatchHoverEvent(event); // enter 1575 mHoveredSelf = true; 1576 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1577 // Synthesize an enter from a move. 1578 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1579 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1580 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1581 eventNoHistory.setAction(action); 1582 1583 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1584 mHoveredSelf = true; 1585 } 1586 } 1587 } 1588 1589 // Recycle the copy of the event that we made. 1590 if (eventNoHistory != event) { 1591 eventNoHistory.recycle(); 1592 } 1593 1594 // Done. 1595 return handled; 1596 } 1597 1598 private void exitHoverTargets() { 1599 if (mHoveredSelf || mFirstHoverTarget != null) { 1600 final long now = SystemClock.uptimeMillis(); 1601 MotionEvent event = MotionEvent.obtain(now, now, 1602 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1603 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1604 dispatchHoverEvent(event); 1605 event.recycle(); 1606 } 1607 } 1608 1609 private void cancelHoverTarget(View view) { 1610 HoverTarget predecessor = null; 1611 HoverTarget target = mFirstHoverTarget; 1612 while (target != null) { 1613 final HoverTarget next = target.next; 1614 if (target.child == view) { 1615 if (predecessor == null) { 1616 mFirstHoverTarget = next; 1617 } else { 1618 predecessor.next = next; 1619 } 1620 target.recycle(); 1621 1622 final long now = SystemClock.uptimeMillis(); 1623 MotionEvent event = MotionEvent.obtain(now, now, 1624 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1625 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1626 view.dispatchHoverEvent(event); 1627 event.recycle(); 1628 return; 1629 } 1630 predecessor = target; 1631 target = next; 1632 } 1633 } 1634 1635 /** @hide */ 1636 @Override 1637 protected boolean hasHoveredChild() { 1638 return mFirstHoverTarget != null; 1639 } 1640 1641 @Override 1642 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1643 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1644 try { 1645 final int childrenCount = children.getChildCount(); 1646 for (int i = 0; i < childrenCount; i++) { 1647 View child = children.getChildAt(i); 1648 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1649 if (child.includeForAccessibility()) { 1650 childrenForAccessibility.add(child); 1651 } else { 1652 child.addChildrenForAccessibility(childrenForAccessibility); 1653 } 1654 } 1655 } 1656 } finally { 1657 children.recycle(); 1658 } 1659 } 1660 1661 /** 1662 * @hide 1663 */ 1664 @Override 1665 public void childAccessibilityStateChanged(View child) { 1666 if (mParent != null) { 1667 mParent.childAccessibilityStateChanged(child); 1668 } 1669 } 1670 1671 /** 1672 * Implement this method to intercept hover events before they are handled 1673 * by child views. 1674 * <p> 1675 * This method is called before dispatching a hover event to a child of 1676 * the view group or to the view group's own {@link #onHoverEvent} to allow 1677 * the view group a chance to intercept the hover event. 1678 * This method can also be used to watch all pointer motions that occur within 1679 * the bounds of the view group even when the pointer is hovering over 1680 * a child of the view group rather than over the view group itself. 1681 * </p><p> 1682 * The view group can prevent its children from receiving hover events by 1683 * implementing this method and returning <code>true</code> to indicate 1684 * that it would like to intercept hover events. The view group must 1685 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1686 * for as long as it wishes to continue intercepting hover events from 1687 * its children. 1688 * </p><p> 1689 * Interception preserves the invariant that at most one view can be 1690 * hovered at a time by transferring hover focus from the currently hovered 1691 * child to the view group or vice-versa as needed. 1692 * </p><p> 1693 * If this method returns <code>true</code> and a child is already hovered, then the 1694 * child view will first receive a hover exit event and then the view group 1695 * itself will receive a hover enter event in {@link #onHoverEvent}. 1696 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1697 * events and instead returns <code>false</code> while the pointer is hovering 1698 * within the bounds of one of a child, then the view group will first receive a 1699 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1700 * receive a hover enter event. 1701 * </p><p> 1702 * The default implementation always returns false. 1703 * </p> 1704 * 1705 * @param event The motion event that describes the hover. 1706 * @return True if the view group would like to intercept the hover event 1707 * and prevent its children from receiving it. 1708 */ 1709 public boolean onInterceptHoverEvent(MotionEvent event) { 1710 return false; 1711 } 1712 1713 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1714 if (event.getHistorySize() == 0) { 1715 return event; 1716 } 1717 return MotionEvent.obtainNoHistory(event); 1718 } 1719 1720 /** 1721 * {@inheritDoc} 1722 */ 1723 @Override 1724 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1725 // Send the event to the child under the pointer. 1726 final int childrenCount = mChildrenCount; 1727 if (childrenCount != 0) { 1728 final View[] children = mChildren; 1729 final float x = event.getX(); 1730 final float y = event.getY(); 1731 1732 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1733 for (int i = childrenCount - 1; i >= 0; i--) { 1734 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1735 final View child = children[childIndex]; 1736 if (!canViewReceivePointerEvents(child) 1737 || !isTransformedTouchPointInView(x, y, child, null)) { 1738 continue; 1739 } 1740 1741 if (dispatchTransformedGenericPointerEvent(event, child)) { 1742 return true; 1743 } 1744 } 1745 } 1746 1747 // No child handled the event. Send it to this view group. 1748 return super.dispatchGenericPointerEvent(event); 1749 } 1750 1751 /** 1752 * {@inheritDoc} 1753 */ 1754 @Override 1755 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1756 // Send the event to the focused child or to this view group if it has focus. 1757 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1758 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1759 return super.dispatchGenericFocusedEvent(event); 1760 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1761 == PFLAG_HAS_BOUNDS) { 1762 return mFocused.dispatchGenericMotionEvent(event); 1763 } 1764 return false; 1765 } 1766 1767 /** 1768 * Dispatches a generic pointer event to a child, taking into account 1769 * transformations that apply to the child. 1770 * 1771 * @param event The event to send. 1772 * @param child The view to send the event to. 1773 * @return {@code true} if the child handled the event. 1774 */ 1775 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1776 final float offsetX = mScrollX - child.mLeft; 1777 final float offsetY = mScrollY - child.mTop; 1778 1779 boolean handled; 1780 if (!child.hasIdentityMatrix()) { 1781 MotionEvent transformedEvent = MotionEvent.obtain(event); 1782 transformedEvent.offsetLocation(offsetX, offsetY); 1783 transformedEvent.transform(child.getInverseMatrix()); 1784 handled = child.dispatchGenericMotionEvent(transformedEvent); 1785 transformedEvent.recycle(); 1786 } else { 1787 event.offsetLocation(offsetX, offsetY); 1788 handled = child.dispatchGenericMotionEvent(event); 1789 event.offsetLocation(-offsetX, -offsetY); 1790 } 1791 return handled; 1792 } 1793 1794 /** 1795 * {@inheritDoc} 1796 */ 1797 @Override 1798 public boolean dispatchTouchEvent(MotionEvent ev) { 1799 if (mInputEventConsistencyVerifier != null) { 1800 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1801 } 1802 1803 boolean handled = false; 1804 if (onFilterTouchEventForSecurity(ev)) { 1805 final int action = ev.getAction(); 1806 final int actionMasked = action & MotionEvent.ACTION_MASK; 1807 1808 // Handle an initial down. 1809 if (actionMasked == MotionEvent.ACTION_DOWN) { 1810 // Throw away all previous state when starting a new touch gesture. 1811 // The framework may have dropped the up or cancel event for the previous gesture 1812 // due to an app switch, ANR, or some other state change. 1813 cancelAndClearTouchTargets(ev); 1814 resetTouchState(); 1815 } 1816 1817 // Check for interception. 1818 final boolean intercepted; 1819 if (actionMasked == MotionEvent.ACTION_DOWN 1820 || mFirstTouchTarget != null) { 1821 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1822 if (!disallowIntercept) { 1823 intercepted = onInterceptTouchEvent(ev); 1824 ev.setAction(action); // restore action in case it was changed 1825 } else { 1826 intercepted = false; 1827 } 1828 } else { 1829 // There are no touch targets and this action is not an initial down 1830 // so this view group continues to intercept touches. 1831 intercepted = true; 1832 } 1833 1834 // Check for cancelation. 1835 final boolean canceled = resetCancelNextUpFlag(this) 1836 || actionMasked == MotionEvent.ACTION_CANCEL; 1837 1838 // Update list of touch targets for pointer down, if needed. 1839 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1840 TouchTarget newTouchTarget = null; 1841 boolean alreadyDispatchedToNewTouchTarget = false; 1842 if (!canceled && !intercepted) { 1843 if (actionMasked == MotionEvent.ACTION_DOWN 1844 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1845 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1846 final int actionIndex = ev.getActionIndex(); // always 0 for down 1847 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1848 : TouchTarget.ALL_POINTER_IDS; 1849 1850 // Clean up earlier touch targets for this pointer id in case they 1851 // have become out of sync. 1852 removePointersFromTouchTargets(idBitsToAssign); 1853 1854 final int childrenCount = mChildrenCount; 1855 if (childrenCount != 0) { 1856 // Find a child that can receive the event. 1857 // Scan children from front to back. 1858 final View[] children = mChildren; 1859 final float x = ev.getX(actionIndex); 1860 final float y = ev.getY(actionIndex); 1861 1862 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1863 for (int i = childrenCount - 1; i >= 0; i--) { 1864 final int childIndex = customOrder ? 1865 getChildDrawingOrder(childrenCount, i) : i; 1866 final View child = children[childIndex]; 1867 if (!canViewReceivePointerEvents(child) 1868 || !isTransformedTouchPointInView(x, y, child, null)) { 1869 continue; 1870 } 1871 1872 newTouchTarget = getTouchTarget(child); 1873 if (newTouchTarget != null) { 1874 // Child is already receiving touch within its bounds. 1875 // Give it the new pointer in addition to the ones it is handling. 1876 newTouchTarget.pointerIdBits |= idBitsToAssign; 1877 break; 1878 } 1879 1880 resetCancelNextUpFlag(child); 1881 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1882 // Child wants to receive touch within its bounds. 1883 mLastTouchDownTime = ev.getDownTime(); 1884 mLastTouchDownIndex = childIndex; 1885 mLastTouchDownX = ev.getX(); 1886 mLastTouchDownY = ev.getY(); 1887 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1888 alreadyDispatchedToNewTouchTarget = true; 1889 break; 1890 } 1891 } 1892 } 1893 1894 if (newTouchTarget == null && mFirstTouchTarget != null) { 1895 // Did not find a child to receive the event. 1896 // Assign the pointer to the least recently added target. 1897 newTouchTarget = mFirstTouchTarget; 1898 while (newTouchTarget.next != null) { 1899 newTouchTarget = newTouchTarget.next; 1900 } 1901 newTouchTarget.pointerIdBits |= idBitsToAssign; 1902 } 1903 } 1904 } 1905 1906 // Dispatch to touch targets. 1907 if (mFirstTouchTarget == null) { 1908 // No touch targets so treat this as an ordinary view. 1909 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1910 TouchTarget.ALL_POINTER_IDS); 1911 } else { 1912 // Dispatch to touch targets, excluding the new touch target if we already 1913 // dispatched to it. Cancel touch targets if necessary. 1914 TouchTarget predecessor = null; 1915 TouchTarget target = mFirstTouchTarget; 1916 while (target != null) { 1917 final TouchTarget next = target.next; 1918 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1919 handled = true; 1920 } else { 1921 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1922 || intercepted; 1923 if (dispatchTransformedTouchEvent(ev, cancelChild, 1924 target.child, target.pointerIdBits)) { 1925 handled = true; 1926 } 1927 if (cancelChild) { 1928 if (predecessor == null) { 1929 mFirstTouchTarget = next; 1930 } else { 1931 predecessor.next = next; 1932 } 1933 target.recycle(); 1934 target = next; 1935 continue; 1936 } 1937 } 1938 predecessor = target; 1939 target = next; 1940 } 1941 } 1942 1943 // Update list of touch targets for pointer up or cancel, if needed. 1944 if (canceled 1945 || actionMasked == MotionEvent.ACTION_UP 1946 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1947 resetTouchState(); 1948 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1949 final int actionIndex = ev.getActionIndex(); 1950 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1951 removePointersFromTouchTargets(idBitsToRemove); 1952 } 1953 } 1954 1955 if (!handled && mInputEventConsistencyVerifier != null) { 1956 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1957 } 1958 return handled; 1959 } 1960 1961 /** 1962 * Resets all touch state in preparation for a new cycle. 1963 */ 1964 private void resetTouchState() { 1965 clearTouchTargets(); 1966 resetCancelNextUpFlag(this); 1967 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1968 } 1969 1970 /** 1971 * Resets the cancel next up flag. 1972 * Returns true if the flag was previously set. 1973 */ 1974 private static boolean resetCancelNextUpFlag(View view) { 1975 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 1976 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 1977 return true; 1978 } 1979 return false; 1980 } 1981 1982 /** 1983 * Clears all touch targets. 1984 */ 1985 private void clearTouchTargets() { 1986 TouchTarget target = mFirstTouchTarget; 1987 if (target != null) { 1988 do { 1989 TouchTarget next = target.next; 1990 target.recycle(); 1991 target = next; 1992 } while (target != null); 1993 mFirstTouchTarget = null; 1994 } 1995 } 1996 1997 /** 1998 * Cancels and clears all touch targets. 1999 */ 2000 private void cancelAndClearTouchTargets(MotionEvent event) { 2001 if (mFirstTouchTarget != null) { 2002 boolean syntheticEvent = false; 2003 if (event == null) { 2004 final long now = SystemClock.uptimeMillis(); 2005 event = MotionEvent.obtain(now, now, 2006 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2007 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2008 syntheticEvent = true; 2009 } 2010 2011 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2012 resetCancelNextUpFlag(target.child); 2013 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2014 } 2015 clearTouchTargets(); 2016 2017 if (syntheticEvent) { 2018 event.recycle(); 2019 } 2020 } 2021 } 2022 2023 /** 2024 * Gets the touch target for specified child view. 2025 * Returns null if not found. 2026 */ 2027 private TouchTarget getTouchTarget(View child) { 2028 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2029 if (target.child == child) { 2030 return target; 2031 } 2032 } 2033 return null; 2034 } 2035 2036 /** 2037 * Adds a touch target for specified child to the beginning of the list. 2038 * Assumes the target child is not already present. 2039 */ 2040 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2041 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2042 target.next = mFirstTouchTarget; 2043 mFirstTouchTarget = target; 2044 return target; 2045 } 2046 2047 /** 2048 * Removes the pointer ids from consideration. 2049 */ 2050 private void removePointersFromTouchTargets(int pointerIdBits) { 2051 TouchTarget predecessor = null; 2052 TouchTarget target = mFirstTouchTarget; 2053 while (target != null) { 2054 final TouchTarget next = target.next; 2055 if ((target.pointerIdBits & pointerIdBits) != 0) { 2056 target.pointerIdBits &= ~pointerIdBits; 2057 if (target.pointerIdBits == 0) { 2058 if (predecessor == null) { 2059 mFirstTouchTarget = next; 2060 } else { 2061 predecessor.next = next; 2062 } 2063 target.recycle(); 2064 target = next; 2065 continue; 2066 } 2067 } 2068 predecessor = target; 2069 target = next; 2070 } 2071 } 2072 2073 private void cancelTouchTarget(View view) { 2074 TouchTarget predecessor = null; 2075 TouchTarget target = mFirstTouchTarget; 2076 while (target != null) { 2077 final TouchTarget next = target.next; 2078 if (target.child == view) { 2079 if (predecessor == null) { 2080 mFirstTouchTarget = next; 2081 } else { 2082 predecessor.next = next; 2083 } 2084 target.recycle(); 2085 2086 final long now = SystemClock.uptimeMillis(); 2087 MotionEvent event = MotionEvent.obtain(now, now, 2088 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2089 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2090 view.dispatchTouchEvent(event); 2091 event.recycle(); 2092 return; 2093 } 2094 predecessor = target; 2095 target = next; 2096 } 2097 } 2098 2099 /** 2100 * Returns true if a child view can receive pointer events. 2101 * @hide 2102 */ 2103 private static boolean canViewReceivePointerEvents(View child) { 2104 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2105 || child.getAnimation() != null; 2106 } 2107 2108 /** 2109 * Returns true if a child view contains the specified point when transformed 2110 * into its coordinate space. 2111 * Child must not be null. 2112 * @hide 2113 */ 2114 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2115 PointF outLocalPoint) { 2116 float localX = x + mScrollX - child.mLeft; 2117 float localY = y + mScrollY - child.mTop; 2118 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2119 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2120 localXY[0] = localX; 2121 localXY[1] = localY; 2122 child.getInverseMatrix().mapPoints(localXY); 2123 localX = localXY[0]; 2124 localY = localXY[1]; 2125 } 2126 final boolean isInView = child.pointInView(localX, localY); 2127 if (isInView && outLocalPoint != null) { 2128 outLocalPoint.set(localX, localY); 2129 } 2130 return isInView; 2131 } 2132 2133 /** 2134 * Transforms a motion event into the coordinate space of a particular child view, 2135 * filters out irrelevant pointer ids, and overrides its action if necessary. 2136 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2137 */ 2138 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2139 View child, int desiredPointerIdBits) { 2140 final boolean handled; 2141 2142 // Canceling motions is a special case. We don't need to perform any transformations 2143 // or filtering. The important part is the action, not the contents. 2144 final int oldAction = event.getAction(); 2145 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2146 event.setAction(MotionEvent.ACTION_CANCEL); 2147 if (child == null) { 2148 handled = super.dispatchTouchEvent(event); 2149 } else { 2150 handled = child.dispatchTouchEvent(event); 2151 } 2152 event.setAction(oldAction); 2153 return handled; 2154 } 2155 2156 // Calculate the number of pointers to deliver. 2157 final int oldPointerIdBits = event.getPointerIdBits(); 2158 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2159 2160 // If for some reason we ended up in an inconsistent state where it looks like we 2161 // might produce a motion event with no pointers in it, then drop the event. 2162 if (newPointerIdBits == 0) { 2163 return false; 2164 } 2165 2166 // If the number of pointers is the same and we don't need to perform any fancy 2167 // irreversible transformations, then we can reuse the motion event for this 2168 // dispatch as long as we are careful to revert any changes we make. 2169 // Otherwise we need to make a copy. 2170 final MotionEvent transformedEvent; 2171 if (newPointerIdBits == oldPointerIdBits) { 2172 if (child == null || child.hasIdentityMatrix()) { 2173 if (child == null) { 2174 handled = super.dispatchTouchEvent(event); 2175 } else { 2176 final float offsetX = mScrollX - child.mLeft; 2177 final float offsetY = mScrollY - child.mTop; 2178 event.offsetLocation(offsetX, offsetY); 2179 2180 handled = child.dispatchTouchEvent(event); 2181 2182 event.offsetLocation(-offsetX, -offsetY); 2183 } 2184 return handled; 2185 } 2186 transformedEvent = MotionEvent.obtain(event); 2187 } else { 2188 transformedEvent = event.split(newPointerIdBits); 2189 } 2190 2191 // Perform any necessary transformations and dispatch. 2192 if (child == null) { 2193 handled = super.dispatchTouchEvent(transformedEvent); 2194 } else { 2195 final float offsetX = mScrollX - child.mLeft; 2196 final float offsetY = mScrollY - child.mTop; 2197 transformedEvent.offsetLocation(offsetX, offsetY); 2198 if (! child.hasIdentityMatrix()) { 2199 transformedEvent.transform(child.getInverseMatrix()); 2200 } 2201 2202 handled = child.dispatchTouchEvent(transformedEvent); 2203 } 2204 2205 // Done. 2206 transformedEvent.recycle(); 2207 return handled; 2208 } 2209 2210 /** 2211 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2212 * dispatch. This behavior is enabled by default for applications that target an 2213 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2214 * 2215 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2216 * views depending on where each pointer initially went down. This allows for user interactions 2217 * such as scrolling two panes of content independently, chording of buttons, and performing 2218 * independent gestures on different pieces of content. 2219 * 2220 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2221 * child views. <code>false</code> to only allow one child view to be the target of 2222 * any MotionEvent received by this ViewGroup. 2223 */ 2224 public void setMotionEventSplittingEnabled(boolean split) { 2225 // TODO Applications really shouldn't change this setting mid-touch event, 2226 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2227 // with gestures in progress when this is changed. 2228 if (split) { 2229 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2230 } else { 2231 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2232 } 2233 } 2234 2235 /** 2236 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2237 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2238 */ 2239 public boolean isMotionEventSplittingEnabled() { 2240 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2241 } 2242 2243 /** 2244 * {@inheritDoc} 2245 */ 2246 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2247 2248 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2249 // We're already in this state, assume our ancestors are too 2250 return; 2251 } 2252 2253 if (disallowIntercept) { 2254 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2255 } else { 2256 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2257 } 2258 2259 // Pass it up to our parent 2260 if (mParent != null) { 2261 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2262 } 2263 } 2264 2265 /** 2266 * Implement this method to intercept all touch screen motion events. This 2267 * allows you to watch events as they are dispatched to your children, and 2268 * take ownership of the current gesture at any point. 2269 * 2270 * <p>Using this function takes some care, as it has a fairly complicated 2271 * interaction with {@link View#onTouchEvent(MotionEvent) 2272 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2273 * that method as well as this one in the correct way. Events will be 2274 * received in the following order: 2275 * 2276 * <ol> 2277 * <li> You will receive the down event here. 2278 * <li> The down event will be handled either by a child of this view 2279 * group, or given to your own onTouchEvent() method to handle; this means 2280 * you should implement onTouchEvent() to return true, so you will 2281 * continue to see the rest of the gesture (instead of looking for 2282 * a parent view to handle it). Also, by returning true from 2283 * onTouchEvent(), you will not receive any following 2284 * events in onInterceptTouchEvent() and all touch processing must 2285 * happen in onTouchEvent() like normal. 2286 * <li> For as long as you return false from this function, each following 2287 * event (up to and including the final up) will be delivered first here 2288 * and then to the target's onTouchEvent(). 2289 * <li> If you return true from here, you will not receive any 2290 * following events: the target view will receive the same event but 2291 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2292 * events will be delivered to your onTouchEvent() method and no longer 2293 * appear here. 2294 * </ol> 2295 * 2296 * @param ev The motion event being dispatched down the hierarchy. 2297 * @return Return true to steal motion events from the children and have 2298 * them dispatched to this ViewGroup through onTouchEvent(). 2299 * The current target will receive an ACTION_CANCEL event, and no further 2300 * messages will be delivered here. 2301 */ 2302 public boolean onInterceptTouchEvent(MotionEvent ev) { 2303 return false; 2304 } 2305 2306 /** 2307 * {@inheritDoc} 2308 * 2309 * Looks for a view to give focus to respecting the setting specified by 2310 * {@link #getDescendantFocusability()}. 2311 * 2312 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2313 * find focus within the children of this group when appropriate. 2314 * 2315 * @see #FOCUS_BEFORE_DESCENDANTS 2316 * @see #FOCUS_AFTER_DESCENDANTS 2317 * @see #FOCUS_BLOCK_DESCENDANTS 2318 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2319 */ 2320 @Override 2321 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2322 if (DBG) { 2323 System.out.println(this + " ViewGroup.requestFocus direction=" 2324 + direction); 2325 } 2326 int descendantFocusability = getDescendantFocusability(); 2327 2328 switch (descendantFocusability) { 2329 case FOCUS_BLOCK_DESCENDANTS: 2330 return super.requestFocus(direction, previouslyFocusedRect); 2331 case FOCUS_BEFORE_DESCENDANTS: { 2332 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2333 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2334 } 2335 case FOCUS_AFTER_DESCENDANTS: { 2336 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2337 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2338 } 2339 default: 2340 throw new IllegalStateException("descendant focusability must be " 2341 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2342 + "but is " + descendantFocusability); 2343 } 2344 } 2345 2346 /** 2347 * Look for a descendant to call {@link View#requestFocus} on. 2348 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2349 * when it wants to request focus within its children. Override this to 2350 * customize how your {@link ViewGroup} requests focus within its children. 2351 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2352 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2353 * to give a finer grained hint about where focus is coming from. May be null 2354 * if there is no hint. 2355 * @return Whether focus was taken. 2356 */ 2357 @SuppressWarnings({"ConstantConditions"}) 2358 protected boolean onRequestFocusInDescendants(int direction, 2359 Rect previouslyFocusedRect) { 2360 int index; 2361 int increment; 2362 int end; 2363 int count = mChildrenCount; 2364 if ((direction & FOCUS_FORWARD) != 0) { 2365 index = 0; 2366 increment = 1; 2367 end = count; 2368 } else { 2369 index = count - 1; 2370 increment = -1; 2371 end = -1; 2372 } 2373 final View[] children = mChildren; 2374 for (int i = index; i != end; i += increment) { 2375 View child = children[i]; 2376 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2377 if (child.requestFocus(direction, previouslyFocusedRect)) { 2378 return true; 2379 } 2380 } 2381 } 2382 return false; 2383 } 2384 2385 /** 2386 * {@inheritDoc} 2387 * 2388 * @hide 2389 */ 2390 @Override 2391 public void dispatchStartTemporaryDetach() { 2392 super.dispatchStartTemporaryDetach(); 2393 final int count = mChildrenCount; 2394 final View[] children = mChildren; 2395 for (int i = 0; i < count; i++) { 2396 children[i].dispatchStartTemporaryDetach(); 2397 } 2398 } 2399 2400 /** 2401 * {@inheritDoc} 2402 * 2403 * @hide 2404 */ 2405 @Override 2406 public void dispatchFinishTemporaryDetach() { 2407 super.dispatchFinishTemporaryDetach(); 2408 final int count = mChildrenCount; 2409 final View[] children = mChildren; 2410 for (int i = 0; i < count; i++) { 2411 children[i].dispatchFinishTemporaryDetach(); 2412 } 2413 } 2414 2415 /** 2416 * {@inheritDoc} 2417 */ 2418 @Override 2419 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2420 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2421 super.dispatchAttachedToWindow(info, visibility); 2422 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2423 2424 final int count = mChildrenCount; 2425 final View[] children = mChildren; 2426 for (int i = 0; i < count; i++) { 2427 final View child = children[i]; 2428 child.dispatchAttachedToWindow(info, 2429 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2430 } 2431 } 2432 2433 @Override 2434 void dispatchScreenStateChanged(int screenState) { 2435 super.dispatchScreenStateChanged(screenState); 2436 2437 final int count = mChildrenCount; 2438 final View[] children = mChildren; 2439 for (int i = 0; i < count; i++) { 2440 children[i].dispatchScreenStateChanged(screenState); 2441 } 2442 } 2443 2444 @Override 2445 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2446 boolean handled = false; 2447 if (includeForAccessibility()) { 2448 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2449 if (handled) { 2450 return handled; 2451 } 2452 } 2453 // Let our children have a shot in populating the event. 2454 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2455 try { 2456 final int childCount = children.getChildCount(); 2457 for (int i = 0; i < childCount; i++) { 2458 View child = children.getChildAt(i); 2459 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2460 handled = child.dispatchPopulateAccessibilityEvent(event); 2461 if (handled) { 2462 return handled; 2463 } 2464 } 2465 } 2466 } finally { 2467 children.recycle(); 2468 } 2469 return false; 2470 } 2471 2472 @Override 2473 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2474 super.onInitializeAccessibilityNodeInfoInternal(info); 2475 if (mAttachInfo != null) { 2476 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2477 childrenForAccessibility.clear(); 2478 addChildrenForAccessibility(childrenForAccessibility); 2479 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2480 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2481 View child = childrenForAccessibility.get(i); 2482 info.addChild(child); 2483 } 2484 childrenForAccessibility.clear(); 2485 } 2486 } 2487 2488 @Override 2489 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2490 super.onInitializeAccessibilityEventInternal(event); 2491 event.setClassName(ViewGroup.class.getName()); 2492 } 2493 2494 /** 2495 * @hide 2496 */ 2497 @Override 2498 public void resetAccessibilityStateChanged() { 2499 super.resetAccessibilityStateChanged(); 2500 View[] children = mChildren; 2501 final int childCount = mChildrenCount; 2502 for (int i = 0; i < childCount; i++) { 2503 View child = children[i]; 2504 child.resetAccessibilityStateChanged(); 2505 } 2506 } 2507 2508 /** 2509 * {@inheritDoc} 2510 */ 2511 @Override 2512 void dispatchDetachedFromWindow() { 2513 // If we still have a touch target, we are still in the process of 2514 // dispatching motion events to a child; we need to get rid of that 2515 // child to avoid dispatching events to it after the window is torn 2516 // down. To make sure we keep the child in a consistent state, we 2517 // first send it an ACTION_CANCEL motion event. 2518 cancelAndClearTouchTargets(null); 2519 2520 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2521 exitHoverTargets(); 2522 2523 // In case view is detached while transition is running 2524 mLayoutSuppressed = false; 2525 2526 // Tear down our drag tracking 2527 mDragNotifiedChildren = null; 2528 if (mCurrentDrag != null) { 2529 mCurrentDrag.recycle(); 2530 mCurrentDrag = null; 2531 } 2532 2533 final int count = mChildrenCount; 2534 final View[] children = mChildren; 2535 for (int i = 0; i < count; i++) { 2536 children[i].dispatchDetachedFromWindow(); 2537 } 2538 super.dispatchDetachedFromWindow(); 2539 } 2540 2541 /** 2542 * @hide 2543 */ 2544 @Override 2545 protected void internalSetPadding(int left, int top, int right, int bottom) { 2546 super.internalSetPadding(left, top, right, bottom); 2547 2548 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2549 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2550 } else { 2551 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2552 } 2553 } 2554 2555 /** 2556 * {@inheritDoc} 2557 */ 2558 @Override 2559 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2560 super.dispatchSaveInstanceState(container); 2561 final int count = mChildrenCount; 2562 final View[] children = mChildren; 2563 for (int i = 0; i < count; i++) { 2564 View c = children[i]; 2565 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2566 c.dispatchSaveInstanceState(container); 2567 } 2568 } 2569 } 2570 2571 /** 2572 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2573 * to only this view, not to its children. For use when overriding 2574 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2575 * subclasses to freeze their own state but not the state of their children. 2576 * 2577 * @param container the container 2578 */ 2579 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2580 super.dispatchSaveInstanceState(container); 2581 } 2582 2583 /** 2584 * {@inheritDoc} 2585 */ 2586 @Override 2587 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2588 super.dispatchRestoreInstanceState(container); 2589 final int count = mChildrenCount; 2590 final View[] children = mChildren; 2591 for (int i = 0; i < count; i++) { 2592 View c = children[i]; 2593 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2594 c.dispatchRestoreInstanceState(container); 2595 } 2596 } 2597 } 2598 2599 /** 2600 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2601 * to only this view, not to its children. For use when overriding 2602 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2603 * subclasses to thaw their own state but not the state of their children. 2604 * 2605 * @param container the container 2606 */ 2607 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2608 super.dispatchRestoreInstanceState(container); 2609 } 2610 2611 /** 2612 * Enables or disables the drawing cache for each child of this view group. 2613 * 2614 * @param enabled true to enable the cache, false to dispose of it 2615 */ 2616 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2617 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2618 final View[] children = mChildren; 2619 final int count = mChildrenCount; 2620 for (int i = 0; i < count; i++) { 2621 children[i].setDrawingCacheEnabled(enabled); 2622 } 2623 } 2624 } 2625 2626 @Override 2627 protected void onAnimationStart() { 2628 super.onAnimationStart(); 2629 2630 // When this ViewGroup's animation starts, build the cache for the children 2631 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2632 final int count = mChildrenCount; 2633 final View[] children = mChildren; 2634 final boolean buildCache = !isHardwareAccelerated(); 2635 2636 for (int i = 0; i < count; i++) { 2637 final View child = children[i]; 2638 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2639 child.setDrawingCacheEnabled(true); 2640 if (buildCache) { 2641 child.buildDrawingCache(true); 2642 } 2643 } 2644 } 2645 2646 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2647 } 2648 } 2649 2650 @Override 2651 protected void onAnimationEnd() { 2652 super.onAnimationEnd(); 2653 2654 // When this ViewGroup's animation ends, destroy the cache of the children 2655 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2656 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2657 2658 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2659 setChildrenDrawingCacheEnabled(false); 2660 } 2661 } 2662 } 2663 2664 @Override 2665 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2666 int count = mChildrenCount; 2667 int[] visibilities = null; 2668 2669 if (skipChildren) { 2670 visibilities = new int[count]; 2671 for (int i = 0; i < count; i++) { 2672 View child = getChildAt(i); 2673 visibilities[i] = child.getVisibility(); 2674 if (visibilities[i] == View.VISIBLE) { 2675 child.setVisibility(INVISIBLE); 2676 } 2677 } 2678 } 2679 2680 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2681 2682 if (skipChildren) { 2683 for (int i = 0; i < count; i++) { 2684 getChildAt(i).setVisibility(visibilities[i]); 2685 } 2686 } 2687 2688 return b; 2689 } 2690 2691 /** Return true if this ViewGroup is laying out using optical bounds. */ 2692 boolean isLayoutModeOptical() { 2693 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2694 } 2695 2696 Insets computeOpticalInsets() { 2697 if (isLayoutModeOptical()) { 2698 int left = 0; 2699 int top = 0; 2700 int right = 0; 2701 int bottom = 0; 2702 for (int i = 0; i < mChildrenCount; i++) { 2703 View child = getChildAt(i); 2704 if (child.getVisibility() == VISIBLE) { 2705 Insets insets = child.getOpticalInsets(); 2706 left = Math.max(left, insets.left); 2707 top = Math.max(top, insets.top); 2708 right = Math.max(right, insets.right); 2709 bottom = Math.max(bottom, insets.bottom); 2710 } 2711 } 2712 return Insets.of(left, top, right, bottom); 2713 } else { 2714 return Insets.NONE; 2715 } 2716 } 2717 2718 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2719 if (x1 != x2 && y1 != y2) { 2720 if (x1 > x2) { 2721 int tmp = x1; x1 = x2; x2 = tmp; 2722 } 2723 if (y1 > y2) { 2724 int tmp = y1; y1 = y2; y2 = tmp; 2725 } 2726 canvas.drawRect(x1, y1, x2, y2, paint); 2727 } 2728 } 2729 2730 private static int sign(int x) { 2731 return (x >= 0) ? 1 : -1; 2732 } 2733 2734 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2735 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2736 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2737 } 2738 2739 private int dipsToPixels(int dips) { 2740 float scale = getContext().getResources().getDisplayMetrics().density; 2741 return (int) (dips * scale + 0.5f); 2742 } 2743 2744 private void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2745 int lineLength, int lineWidth) { 2746 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2747 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2748 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2749 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2750 } 2751 2752 private static void fillDifference(Canvas canvas, 2753 int x2, int y2, int x3, int y3, 2754 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2755 int x1 = x2 - dx1; 2756 int y1 = y2 - dy1; 2757 2758 int x4 = x3 + dx2; 2759 int y4 = y3 + dy2; 2760 2761 fillRect(canvas, paint, x1, y1, x4, y2); 2762 fillRect(canvas, paint, x1, y2, x2, y3); 2763 fillRect(canvas, paint, x3, y2, x4, y3); 2764 fillRect(canvas, paint, x1, y3, x4, y4); 2765 } 2766 2767 /** 2768 * @hide 2769 */ 2770 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2771 for (int i = 0; i < getChildCount(); i++) { 2772 View c = getChildAt(i); 2773 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2774 } 2775 } 2776 2777 /** 2778 * @hide 2779 */ 2780 protected void onDebugDraw(Canvas canvas) { 2781 Paint paint = getDebugPaint(); 2782 2783 // Draw optical bounds 2784 { 2785 paint.setColor(Color.RED); 2786 paint.setStyle(Paint.Style.STROKE); 2787 2788 for (int i = 0; i < getChildCount(); i++) { 2789 View c = getChildAt(i); 2790 Insets insets = c.getOpticalInsets(); 2791 2792 drawRect(canvas, paint, 2793 c.getLeft() + insets.left, 2794 c.getTop() + insets.top, 2795 c.getRight() - insets.right - 1, 2796 c.getBottom() - insets.bottom - 1); 2797 } 2798 } 2799 2800 // Draw margins 2801 { 2802 paint.setColor(Color.argb(63, 255, 0, 255)); 2803 paint.setStyle(Paint.Style.FILL); 2804 2805 onDebugDrawMargins(canvas, paint); 2806 } 2807 2808 // Draw clip bounds 2809 { 2810 paint.setColor(Color.rgb(63, 127, 255)); 2811 paint.setStyle(Paint.Style.FILL); 2812 2813 int lineLength = dipsToPixels(8); 2814 int lineWidth = dipsToPixels(1); 2815 for (int i = 0; i < getChildCount(); i++) { 2816 View c = getChildAt(i); 2817 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2818 paint, lineLength, lineWidth); 2819 } 2820 } 2821 } 2822 2823 /** 2824 * {@inheritDoc} 2825 */ 2826 @Override 2827 protected void dispatchDraw(Canvas canvas) { 2828 final int count = mChildrenCount; 2829 final View[] children = mChildren; 2830 int flags = mGroupFlags; 2831 2832 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2833 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2834 2835 final boolean buildCache = !isHardwareAccelerated(); 2836 for (int i = 0; i < count; i++) { 2837 final View child = children[i]; 2838 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2839 final LayoutParams params = child.getLayoutParams(); 2840 attachLayoutAnimationParameters(child, params, i, count); 2841 bindLayoutAnimation(child); 2842 if (cache) { 2843 child.setDrawingCacheEnabled(true); 2844 if (buildCache) { 2845 child.buildDrawingCache(true); 2846 } 2847 } 2848 } 2849 } 2850 2851 final LayoutAnimationController controller = mLayoutAnimationController; 2852 if (controller.willOverlap()) { 2853 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2854 } 2855 2856 controller.start(); 2857 2858 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2859 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2860 2861 if (cache) { 2862 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2863 } 2864 2865 if (mAnimationListener != null) { 2866 mAnimationListener.onAnimationStart(controller.getAnimation()); 2867 } 2868 } 2869 2870 int saveCount = 0; 2871 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2872 if (clipToPadding) { 2873 saveCount = canvas.save(); 2874 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2875 mScrollX + mRight - mLeft - mPaddingRight, 2876 mScrollY + mBottom - mTop - mPaddingBottom); 2877 2878 } 2879 2880 // We will draw our child's animation, let's reset the flag 2881 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2882 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2883 2884 boolean more = false; 2885 final long drawingTime = getDrawingTime(); 2886 2887 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2888 for (int i = 0; i < count; i++) { 2889 final View child = children[i]; 2890 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2891 more |= drawChild(canvas, child, drawingTime); 2892 } 2893 } 2894 } else { 2895 for (int i = 0; i < count; i++) { 2896 final View child = children[getChildDrawingOrder(count, i)]; 2897 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2898 more |= drawChild(canvas, child, drawingTime); 2899 } 2900 } 2901 } 2902 2903 // Draw any disappearing views that have animations 2904 if (mDisappearingChildren != null) { 2905 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2906 final int disappearingCount = disappearingChildren.size() - 1; 2907 // Go backwards -- we may delete as animations finish 2908 for (int i = disappearingCount; i >= 0; i--) { 2909 final View child = disappearingChildren.get(i); 2910 more |= drawChild(canvas, child, drawingTime); 2911 } 2912 } 2913 2914 if (debugDraw()) { 2915 onDebugDraw(canvas); 2916 } 2917 2918 if (clipToPadding) { 2919 canvas.restoreToCount(saveCount); 2920 } 2921 2922 // mGroupFlags might have been updated by drawChild() 2923 flags = mGroupFlags; 2924 2925 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2926 invalidate(true); 2927 } 2928 2929 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2930 mLayoutAnimationController.isDone() && !more) { 2931 // We want to erase the drawing cache and notify the listener after the 2932 // next frame is drawn because one extra invalidate() is caused by 2933 // drawChild() after the animation is over 2934 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2935 final Runnable end = new Runnable() { 2936 public void run() { 2937 notifyAnimationListener(); 2938 } 2939 }; 2940 post(end); 2941 } 2942 } 2943 2944 /** 2945 * Returns the index of the child to draw for this iteration. Override this 2946 * if you want to change the drawing order of children. By default, it 2947 * returns i. 2948 * <p> 2949 * NOTE: In order for this method to be called, you must enable child ordering 2950 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2951 * 2952 * @param i The current iteration. 2953 * @return The index of the child to draw this iteration. 2954 * 2955 * @see #setChildrenDrawingOrderEnabled(boolean) 2956 * @see #isChildrenDrawingOrderEnabled() 2957 */ 2958 protected int getChildDrawingOrder(int childCount, int i) { 2959 return i; 2960 } 2961 2962 private void notifyAnimationListener() { 2963 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2964 mGroupFlags |= FLAG_ANIMATION_DONE; 2965 2966 if (mAnimationListener != null) { 2967 final Runnable end = new Runnable() { 2968 public void run() { 2969 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2970 } 2971 }; 2972 post(end); 2973 } 2974 2975 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2976 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2977 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2978 setChildrenDrawingCacheEnabled(false); 2979 } 2980 } 2981 2982 invalidate(true); 2983 } 2984 2985 /** 2986 * This method is used to cause children of this ViewGroup to restore or recreate their 2987 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2988 * to recreate its own display list, which would happen if it went through the normal 2989 * draw/dispatchDraw mechanisms. 2990 * 2991 * @hide 2992 */ 2993 @Override 2994 protected void dispatchGetDisplayList() { 2995 final int count = mChildrenCount; 2996 final View[] children = mChildren; 2997 for (int i = 0; i < count; i++) { 2998 final View child = children[i]; 2999 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3000 child.hasStaticLayer()) { 3001 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3002 == PFLAG_INVALIDATED; 3003 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3004 child.getDisplayList(); 3005 child.mRecreateDisplayList = false; 3006 } 3007 } 3008 } 3009 3010 /** 3011 * Draw one child of this View Group. This method is responsible for getting 3012 * the canvas in the right state. This includes clipping, translating so 3013 * that the child's scrolled origin is at 0, 0, and applying any animation 3014 * transformations. 3015 * 3016 * @param canvas The canvas on which to draw the child 3017 * @param child Who to draw 3018 * @param drawingTime The time at which draw is occurring 3019 * @return True if an invalidate() was issued 3020 */ 3021 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3022 return child.draw(canvas, this, drawingTime); 3023 } 3024 3025 /** 3026 * By default, children are clipped to their bounds before drawing. This 3027 * allows view groups to override this behavior for animations, etc. 3028 * 3029 * @param clipChildren true to clip children to their bounds, 3030 * false otherwise 3031 * @attr ref android.R.styleable#ViewGroup_clipChildren 3032 */ 3033 public void setClipChildren(boolean clipChildren) { 3034 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3035 if (clipChildren != previousValue) { 3036 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3037 for (int i = 0; i < mChildrenCount; ++i) { 3038 View child = getChildAt(i); 3039 if (child.mDisplayList != null) { 3040 child.mDisplayList.setClipChildren(clipChildren); 3041 } 3042 } 3043 } 3044 } 3045 3046 /** 3047 * By default, children are clipped to the padding of the ViewGroup. This 3048 * allows view groups to override this behavior 3049 * 3050 * @param clipToPadding true to clip children to the padding of the 3051 * group, false otherwise 3052 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3053 */ 3054 public void setClipToPadding(boolean clipToPadding) { 3055 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3056 } 3057 3058 /** 3059 * {@inheritDoc} 3060 */ 3061 @Override 3062 public void dispatchSetSelected(boolean selected) { 3063 final View[] children = mChildren; 3064 final int count = mChildrenCount; 3065 for (int i = 0; i < count; i++) { 3066 children[i].setSelected(selected); 3067 } 3068 } 3069 3070 /** 3071 * {@inheritDoc} 3072 */ 3073 @Override 3074 public void dispatchSetActivated(boolean activated) { 3075 final View[] children = mChildren; 3076 final int count = mChildrenCount; 3077 for (int i = 0; i < count; i++) { 3078 children[i].setActivated(activated); 3079 } 3080 } 3081 3082 @Override 3083 protected void dispatchSetPressed(boolean pressed) { 3084 final View[] children = mChildren; 3085 final int count = mChildrenCount; 3086 for (int i = 0; i < count; i++) { 3087 final View child = children[i]; 3088 // Children that are clickable on their own should not 3089 // show a pressed state when their parent view does. 3090 // Clearing a pressed state always propagates. 3091 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3092 child.setPressed(pressed); 3093 } 3094 } 3095 } 3096 3097 /** 3098 * When this property is set to true, this ViewGroup supports static transformations on 3099 * children; this causes 3100 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3101 * invoked when a child is drawn. 3102 * 3103 * Any subclass overriding 3104 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3105 * set this property to true. 3106 * 3107 * @param enabled True to enable static transformations on children, false otherwise. 3108 * 3109 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3110 */ 3111 protected void setStaticTransformationsEnabled(boolean enabled) { 3112 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3113 } 3114 3115 /** 3116 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3117 * boolean to indicate whether a static transform was set. The default implementation 3118 * simply returns <code>false</code>; subclasses may override this method for different 3119 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3120 * for this method to be called. 3121 * 3122 * @param child The child view whose static transform is being requested 3123 * @param t The Transformation which will hold the result 3124 * @return true if the transformation was set, false otherwise 3125 * @see #setStaticTransformationsEnabled(boolean) 3126 */ 3127 protected boolean getChildStaticTransformation(View child, Transformation t) { 3128 return false; 3129 } 3130 3131 /** 3132 * {@hide} 3133 */ 3134 @Override 3135 protected View findViewTraversal(int id) { 3136 if (id == mID) { 3137 return this; 3138 } 3139 3140 final View[] where = mChildren; 3141 final int len = mChildrenCount; 3142 3143 for (int i = 0; i < len; i++) { 3144 View v = where[i]; 3145 3146 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3147 v = v.findViewById(id); 3148 3149 if (v != null) { 3150 return v; 3151 } 3152 } 3153 } 3154 3155 return null; 3156 } 3157 3158 /** 3159 * {@hide} 3160 */ 3161 @Override 3162 protected View findViewWithTagTraversal(Object tag) { 3163 if (tag != null && tag.equals(mTag)) { 3164 return this; 3165 } 3166 3167 final View[] where = mChildren; 3168 final int len = mChildrenCount; 3169 3170 for (int i = 0; i < len; i++) { 3171 View v = where[i]; 3172 3173 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3174 v = v.findViewWithTag(tag); 3175 3176 if (v != null) { 3177 return v; 3178 } 3179 } 3180 } 3181 3182 return null; 3183 } 3184 3185 /** 3186 * {@hide} 3187 */ 3188 @Override 3189 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3190 if (predicate.apply(this)) { 3191 return this; 3192 } 3193 3194 final View[] where = mChildren; 3195 final int len = mChildrenCount; 3196 3197 for (int i = 0; i < len; i++) { 3198 View v = where[i]; 3199 3200 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3201 v = v.findViewByPredicate(predicate); 3202 3203 if (v != null) { 3204 return v; 3205 } 3206 } 3207 } 3208 3209 return null; 3210 } 3211 3212 /** 3213 * <p>Adds a child view. If no layout parameters are already set on the child, the 3214 * default parameters for this ViewGroup are set on the child.</p> 3215 * 3216 * <p><strong>Note:</strong> do not invoke this method from 3217 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3218 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3219 * 3220 * @param child the child view to add 3221 * 3222 * @see #generateDefaultLayoutParams() 3223 */ 3224 public void addView(View child) { 3225 addView(child, -1); 3226 } 3227 3228 /** 3229 * Adds a child view. If no layout parameters are already set on the child, the 3230 * default parameters for this ViewGroup are set on the child. 3231 * 3232 * <p><strong>Note:</strong> do not invoke this method from 3233 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3234 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3235 * 3236 * @param child the child view to add 3237 * @param index the position at which to add the child 3238 * 3239 * @see #generateDefaultLayoutParams() 3240 */ 3241 public void addView(View child, int index) { 3242 LayoutParams params = child.getLayoutParams(); 3243 if (params == null) { 3244 params = generateDefaultLayoutParams(); 3245 if (params == null) { 3246 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3247 } 3248 } 3249 addView(child, index, params); 3250 } 3251 3252 /** 3253 * Adds a child view with this ViewGroup's default layout parameters and the 3254 * specified width and height. 3255 * 3256 * <p><strong>Note:</strong> do not invoke this method from 3257 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3258 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3259 * 3260 * @param child the child view to add 3261 */ 3262 public void addView(View child, int width, int height) { 3263 final LayoutParams params = generateDefaultLayoutParams(); 3264 params.width = width; 3265 params.height = height; 3266 addView(child, -1, params); 3267 } 3268 3269 /** 3270 * Adds a child view with the specified layout parameters. 3271 * 3272 * <p><strong>Note:</strong> do not invoke this method from 3273 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3274 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3275 * 3276 * @param child the child view to add 3277 * @param params the layout parameters to set on the child 3278 */ 3279 public void addView(View child, LayoutParams params) { 3280 addView(child, -1, params); 3281 } 3282 3283 /** 3284 * Adds a child view with the specified layout parameters. 3285 * 3286 * <p><strong>Note:</strong> do not invoke this method from 3287 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3288 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3289 * 3290 * @param child the child view to add 3291 * @param index the position at which to add the child 3292 * @param params the layout parameters to set on the child 3293 */ 3294 public void addView(View child, int index, LayoutParams params) { 3295 if (DBG) { 3296 System.out.println(this + " addView"); 3297 } 3298 3299 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3300 // therefore, we call requestLayout() on ourselves before, so that the child's request 3301 // will be blocked at our level 3302 requestLayout(); 3303 invalidate(true); 3304 addViewInner(child, index, params, false); 3305 } 3306 3307 /** 3308 * {@inheritDoc} 3309 */ 3310 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3311 if (!checkLayoutParams(params)) { 3312 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3313 } 3314 if (view.mParent != this) { 3315 throw new IllegalArgumentException("Given view not a child of " + this); 3316 } 3317 view.setLayoutParams(params); 3318 } 3319 3320 /** 3321 * {@inheritDoc} 3322 */ 3323 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3324 return p != null; 3325 } 3326 3327 /** 3328 * Interface definition for a callback to be invoked when the hierarchy 3329 * within this view changed. The hierarchy changes whenever a child is added 3330 * to or removed from this view. 3331 */ 3332 public interface OnHierarchyChangeListener { 3333 /** 3334 * Called when a new child is added to a parent view. 3335 * 3336 * @param parent the view in which a child was added 3337 * @param child the new child view added in the hierarchy 3338 */ 3339 void onChildViewAdded(View parent, View child); 3340 3341 /** 3342 * Called when a child is removed from a parent view. 3343 * 3344 * @param parent the view from which the child was removed 3345 * @param child the child removed from the hierarchy 3346 */ 3347 void onChildViewRemoved(View parent, View child); 3348 } 3349 3350 /** 3351 * Register a callback to be invoked when a child is added to or removed 3352 * from this view. 3353 * 3354 * @param listener the callback to invoke on hierarchy change 3355 */ 3356 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3357 mOnHierarchyChangeListener = listener; 3358 } 3359 3360 /** 3361 * @hide 3362 */ 3363 protected void onViewAdded(View child) { 3364 if (mOnHierarchyChangeListener != null) { 3365 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3366 } 3367 } 3368 3369 /** 3370 * @hide 3371 */ 3372 protected void onViewRemoved(View child) { 3373 if (mOnHierarchyChangeListener != null) { 3374 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3375 } 3376 } 3377 3378 /** 3379 * Adds a view during layout. This is useful if in your onLayout() method, 3380 * you need to add more views (as does the list view for example). 3381 * 3382 * If index is negative, it means put it at the end of the list. 3383 * 3384 * @param child the view to add to the group 3385 * @param index the index at which the child must be added 3386 * @param params the layout parameters to associate with the child 3387 * @return true if the child was added, false otherwise 3388 */ 3389 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3390 return addViewInLayout(child, index, params, false); 3391 } 3392 3393 /** 3394 * Adds a view during layout. This is useful if in your onLayout() method, 3395 * you need to add more views (as does the list view for example). 3396 * 3397 * If index is negative, it means put it at the end of the list. 3398 * 3399 * @param child the view to add to the group 3400 * @param index the index at which the child must be added 3401 * @param params the layout parameters to associate with the child 3402 * @param preventRequestLayout if true, calling this method will not trigger a 3403 * layout request on child 3404 * @return true if the child was added, false otherwise 3405 */ 3406 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3407 boolean preventRequestLayout) { 3408 child.mParent = null; 3409 addViewInner(child, index, params, preventRequestLayout); 3410 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3411 return true; 3412 } 3413 3414 /** 3415 * Prevents the specified child to be laid out during the next layout pass. 3416 * 3417 * @param child the child on which to perform the cleanup 3418 */ 3419 protected void cleanupLayoutState(View child) { 3420 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3421 } 3422 3423 private void addViewInner(View child, int index, LayoutParams params, 3424 boolean preventRequestLayout) { 3425 3426 if (mTransition != null) { 3427 // Don't prevent other add transitions from completing, but cancel remove 3428 // transitions to let them complete the process before we add to the container 3429 mTransition.cancel(LayoutTransition.DISAPPEARING); 3430 } 3431 3432 if (child.getParent() != null) { 3433 throw new IllegalStateException("The specified child already has a parent. " + 3434 "You must call removeView() on the child's parent first."); 3435 } 3436 3437 if (mTransition != null) { 3438 mTransition.addChild(this, child); 3439 } 3440 3441 if (!checkLayoutParams(params)) { 3442 params = generateLayoutParams(params); 3443 } 3444 3445 if (preventRequestLayout) { 3446 child.mLayoutParams = params; 3447 } else { 3448 child.setLayoutParams(params); 3449 } 3450 3451 if (index < 0) { 3452 index = mChildrenCount; 3453 } 3454 3455 addInArray(child, index); 3456 3457 // tell our children 3458 if (preventRequestLayout) { 3459 child.assignParent(this); 3460 } else { 3461 child.mParent = this; 3462 } 3463 3464 if (child.hasFocus()) { 3465 requestChildFocus(child, child.findFocus()); 3466 } 3467 3468 AttachInfo ai = mAttachInfo; 3469 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3470 boolean lastKeepOn = ai.mKeepScreenOn; 3471 ai.mKeepScreenOn = false; 3472 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3473 if (ai.mKeepScreenOn) { 3474 needGlobalAttributesUpdate(true); 3475 } 3476 ai.mKeepScreenOn = lastKeepOn; 3477 } 3478 3479 if (child.isLayoutDirectionInherited()) { 3480 child.resetRtlProperties(); 3481 } 3482 3483 onViewAdded(child); 3484 3485 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3486 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3487 } 3488 3489 if (child.hasTransientState()) { 3490 childHasTransientStateChanged(child, true); 3491 } 3492 } 3493 3494 private void addInArray(View child, int index) { 3495 View[] children = mChildren; 3496 final int count = mChildrenCount; 3497 final int size = children.length; 3498 if (index == count) { 3499 if (size == count) { 3500 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3501 System.arraycopy(children, 0, mChildren, 0, size); 3502 children = mChildren; 3503 } 3504 children[mChildrenCount++] = child; 3505 } else if (index < count) { 3506 if (size == count) { 3507 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3508 System.arraycopy(children, 0, mChildren, 0, index); 3509 System.arraycopy(children, index, mChildren, index + 1, count - index); 3510 children = mChildren; 3511 } else { 3512 System.arraycopy(children, index, children, index + 1, count - index); 3513 } 3514 children[index] = child; 3515 mChildrenCount++; 3516 if (mLastTouchDownIndex >= index) { 3517 mLastTouchDownIndex++; 3518 } 3519 } else { 3520 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3521 } 3522 } 3523 3524 // This method also sets the child's mParent to null 3525 private void removeFromArray(int index) { 3526 final View[] children = mChildren; 3527 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3528 children[index].mParent = null; 3529 } 3530 final int count = mChildrenCount; 3531 if (index == count - 1) { 3532 children[--mChildrenCount] = null; 3533 } else if (index >= 0 && index < count) { 3534 System.arraycopy(children, index + 1, children, index, count - index - 1); 3535 children[--mChildrenCount] = null; 3536 } else { 3537 throw new IndexOutOfBoundsException(); 3538 } 3539 if (mLastTouchDownIndex == index) { 3540 mLastTouchDownTime = 0; 3541 mLastTouchDownIndex = -1; 3542 } else if (mLastTouchDownIndex > index) { 3543 mLastTouchDownIndex--; 3544 } 3545 } 3546 3547 // This method also sets the children's mParent to null 3548 private void removeFromArray(int start, int count) { 3549 final View[] children = mChildren; 3550 final int childrenCount = mChildrenCount; 3551 3552 start = Math.max(0, start); 3553 final int end = Math.min(childrenCount, start + count); 3554 3555 if (start == end) { 3556 return; 3557 } 3558 3559 if (end == childrenCount) { 3560 for (int i = start; i < end; i++) { 3561 children[i].mParent = null; 3562 children[i] = null; 3563 } 3564 } else { 3565 for (int i = start; i < end; i++) { 3566 children[i].mParent = null; 3567 } 3568 3569 // Since we're looping above, we might as well do the copy, but is arraycopy() 3570 // faster than the extra 2 bounds checks we would do in the loop? 3571 System.arraycopy(children, end, children, start, childrenCount - end); 3572 3573 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3574 children[i] = null; 3575 } 3576 } 3577 3578 mChildrenCount -= (end - start); 3579 } 3580 3581 private void bindLayoutAnimation(View child) { 3582 Animation a = mLayoutAnimationController.getAnimationForView(child); 3583 child.setAnimation(a); 3584 } 3585 3586 /** 3587 * Subclasses should override this method to set layout animation 3588 * parameters on the supplied child. 3589 * 3590 * @param child the child to associate with animation parameters 3591 * @param params the child's layout parameters which hold the animation 3592 * parameters 3593 * @param index the index of the child in the view group 3594 * @param count the number of children in the view group 3595 */ 3596 protected void attachLayoutAnimationParameters(View child, 3597 LayoutParams params, int index, int count) { 3598 LayoutAnimationController.AnimationParameters animationParams = 3599 params.layoutAnimationParameters; 3600 if (animationParams == null) { 3601 animationParams = new LayoutAnimationController.AnimationParameters(); 3602 params.layoutAnimationParameters = animationParams; 3603 } 3604 3605 animationParams.count = count; 3606 animationParams.index = index; 3607 } 3608 3609 /** 3610 * {@inheritDoc} 3611 * 3612 * <p><strong>Note:</strong> do not invoke this method from 3613 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3614 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3615 */ 3616 public void removeView(View view) { 3617 removeViewInternal(view); 3618 requestLayout(); 3619 invalidate(true); 3620 } 3621 3622 /** 3623 * Removes a view during layout. This is useful if in your onLayout() method, 3624 * you need to remove more views. 3625 * 3626 * <p><strong>Note:</strong> do not invoke this method from 3627 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3628 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3629 * 3630 * @param view the view to remove from the group 3631 */ 3632 public void removeViewInLayout(View view) { 3633 removeViewInternal(view); 3634 } 3635 3636 /** 3637 * Removes a range of views during layout. This is useful if in your onLayout() method, 3638 * you need to remove more views. 3639 * 3640 * <p><strong>Note:</strong> do not invoke this method from 3641 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3642 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3643 * 3644 * @param start the index of the first view to remove from the group 3645 * @param count the number of views to remove from the group 3646 */ 3647 public void removeViewsInLayout(int start, int count) { 3648 removeViewsInternal(start, count); 3649 } 3650 3651 /** 3652 * Removes the view at the specified position in the group. 3653 * 3654 * <p><strong>Note:</strong> do not invoke this method from 3655 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3656 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3657 * 3658 * @param index the position in the group of the view to remove 3659 */ 3660 public void removeViewAt(int index) { 3661 removeViewInternal(index, getChildAt(index)); 3662 requestLayout(); 3663 invalidate(true); 3664 } 3665 3666 /** 3667 * Removes the specified range of views from the group. 3668 * 3669 * <p><strong>Note:</strong> do not invoke this method from 3670 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3671 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3672 * 3673 * @param start the first position in the group of the range of views to remove 3674 * @param count the number of views to remove 3675 */ 3676 public void removeViews(int start, int count) { 3677 removeViewsInternal(start, count); 3678 requestLayout(); 3679 invalidate(true); 3680 } 3681 3682 private void removeViewInternal(View view) { 3683 final int index = indexOfChild(view); 3684 if (index >= 0) { 3685 removeViewInternal(index, view); 3686 } 3687 } 3688 3689 private void removeViewInternal(int index, View view) { 3690 3691 if (mTransition != null) { 3692 mTransition.removeChild(this, view); 3693 } 3694 3695 boolean clearChildFocus = false; 3696 if (view == mFocused) { 3697 view.unFocus(); 3698 clearChildFocus = true; 3699 } 3700 3701 view.clearAccessibilityFocus(); 3702 3703 cancelTouchTarget(view); 3704 cancelHoverTarget(view); 3705 3706 if (view.getAnimation() != null || 3707 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3708 addDisappearingView(view); 3709 } else if (view.mAttachInfo != null) { 3710 view.dispatchDetachedFromWindow(); 3711 } 3712 3713 if (view.hasTransientState()) { 3714 childHasTransientStateChanged(view, false); 3715 } 3716 3717 view.resetRtlProperties(); 3718 3719 onViewRemoved(view); 3720 3721 needGlobalAttributesUpdate(false); 3722 3723 removeFromArray(index); 3724 3725 if (clearChildFocus) { 3726 clearChildFocus(view); 3727 ensureInputFocusOnFirstFocusable(); 3728 } 3729 3730 if (view.isAccessibilityFocused()) { 3731 view.clearAccessibilityFocus(); 3732 } 3733 } 3734 3735 /** 3736 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3737 * not null, changes in layout which occur because of children being added to or removed from 3738 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3739 * object. By default, the transition object is null (so layout changes are not animated). 3740 * 3741 * @param transition The LayoutTransition object that will animated changes in layout. A value 3742 * of <code>null</code> means no transition will run on layout changes. 3743 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3744 */ 3745 public void setLayoutTransition(LayoutTransition transition) { 3746 if (mTransition != null) { 3747 mTransition.removeTransitionListener(mLayoutTransitionListener); 3748 } 3749 mTransition = transition; 3750 if (mTransition != null) { 3751 mTransition.addTransitionListener(mLayoutTransitionListener); 3752 } 3753 } 3754 3755 /** 3756 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3757 * not null, changes in layout which occur because of children being added to or removed from 3758 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3759 * object. By default, the transition object is null (so layout changes are not animated). 3760 * 3761 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3762 * A value of <code>null</code> means no transition will run on layout changes. 3763 */ 3764 public LayoutTransition getLayoutTransition() { 3765 return mTransition; 3766 } 3767 3768 private void removeViewsInternal(int start, int count) { 3769 final View focused = mFocused; 3770 final boolean detach = mAttachInfo != null; 3771 View clearChildFocus = null; 3772 3773 final View[] children = mChildren; 3774 final int end = start + count; 3775 3776 for (int i = start; i < end; i++) { 3777 final View view = children[i]; 3778 3779 if (mTransition != null) { 3780 mTransition.removeChild(this, view); 3781 } 3782 3783 if (view == focused) { 3784 view.unFocus(); 3785 clearChildFocus = view; 3786 } 3787 3788 view.clearAccessibilityFocus(); 3789 3790 cancelTouchTarget(view); 3791 cancelHoverTarget(view); 3792 3793 if (view.getAnimation() != null || 3794 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3795 addDisappearingView(view); 3796 } else if (detach) { 3797 view.dispatchDetachedFromWindow(); 3798 } 3799 3800 if (view.hasTransientState()) { 3801 childHasTransientStateChanged(view, false); 3802 } 3803 3804 needGlobalAttributesUpdate(false); 3805 3806 onViewRemoved(view); 3807 } 3808 3809 removeFromArray(start, count); 3810 3811 if (clearChildFocus != null) { 3812 clearChildFocus(clearChildFocus); 3813 ensureInputFocusOnFirstFocusable(); 3814 } 3815 } 3816 3817 /** 3818 * Call this method to remove all child views from the 3819 * ViewGroup. 3820 * 3821 * <p><strong>Note:</strong> do not invoke this method from 3822 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3823 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3824 */ 3825 public void removeAllViews() { 3826 removeAllViewsInLayout(); 3827 requestLayout(); 3828 invalidate(true); 3829 } 3830 3831 /** 3832 * Called by a ViewGroup subclass to remove child views from itself, 3833 * when it must first know its size on screen before it can calculate how many 3834 * child views it will render. An example is a Gallery or a ListView, which 3835 * may "have" 50 children, but actually only render the number of children 3836 * that can currently fit inside the object on screen. Do not call 3837 * this method unless you are extending ViewGroup and understand the 3838 * view measuring and layout pipeline. 3839 * 3840 * <p><strong>Note:</strong> do not invoke this method from 3841 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3842 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3843 */ 3844 public void removeAllViewsInLayout() { 3845 final int count = mChildrenCount; 3846 if (count <= 0) { 3847 return; 3848 } 3849 3850 final View[] children = mChildren; 3851 mChildrenCount = 0; 3852 3853 final View focused = mFocused; 3854 final boolean detach = mAttachInfo != null; 3855 View clearChildFocus = null; 3856 3857 needGlobalAttributesUpdate(false); 3858 3859 for (int i = count - 1; i >= 0; i--) { 3860 final View view = children[i]; 3861 3862 if (mTransition != null) { 3863 mTransition.removeChild(this, view); 3864 } 3865 3866 if (view == focused) { 3867 view.unFocus(); 3868 clearChildFocus = view; 3869 } 3870 3871 view.clearAccessibilityFocus(); 3872 3873 cancelTouchTarget(view); 3874 cancelHoverTarget(view); 3875 3876 if (view.getAnimation() != null || 3877 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3878 addDisappearingView(view); 3879 } else if (detach) { 3880 view.dispatchDetachedFromWindow(); 3881 } 3882 3883 if (view.hasTransientState()) { 3884 childHasTransientStateChanged(view, false); 3885 } 3886 3887 onViewRemoved(view); 3888 3889 view.mParent = null; 3890 children[i] = null; 3891 } 3892 3893 if (clearChildFocus != null) { 3894 clearChildFocus(clearChildFocus); 3895 ensureInputFocusOnFirstFocusable(); 3896 } 3897 } 3898 3899 /** 3900 * Finishes the removal of a detached view. This method will dispatch the detached from 3901 * window event and notify the hierarchy change listener. 3902 * <p> 3903 * This method is intended to be lightweight and makes no assumptions about whether the 3904 * parent or child should be redrawn. Proper use of this method will include also making 3905 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3906 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3907 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 3908 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3909 * 3910 * @param child the child to be definitely removed from the view hierarchy 3911 * @param animate if true and the view has an animation, the view is placed in the 3912 * disappearing views list, otherwise, it is detached from the window 3913 * 3914 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3915 * @see #detachAllViewsFromParent() 3916 * @see #detachViewFromParent(View) 3917 * @see #detachViewFromParent(int) 3918 */ 3919 protected void removeDetachedView(View child, boolean animate) { 3920 if (mTransition != null) { 3921 mTransition.removeChild(this, child); 3922 } 3923 3924 if (child == mFocused) { 3925 child.clearFocus(); 3926 } 3927 3928 child.clearAccessibilityFocus(); 3929 3930 cancelTouchTarget(child); 3931 cancelHoverTarget(child); 3932 3933 if ((animate && child.getAnimation() != null) || 3934 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3935 addDisappearingView(child); 3936 } else if (child.mAttachInfo != null) { 3937 child.dispatchDetachedFromWindow(); 3938 } 3939 3940 if (child.hasTransientState()) { 3941 childHasTransientStateChanged(child, false); 3942 } 3943 3944 onViewRemoved(child); 3945 } 3946 3947 /** 3948 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3949 * sets the layout parameters and puts the view in the list of children so that 3950 * it can be retrieved by calling {@link #getChildAt(int)}. 3951 * <p> 3952 * This method is intended to be lightweight and makes no assumptions about whether the 3953 * parent or child should be redrawn. Proper use of this method will include also making 3954 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3955 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3956 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 3957 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3958 * <p> 3959 * This method should be called only for views which were detached from their parent. 3960 * 3961 * @param child the child to attach 3962 * @param index the index at which the child should be attached 3963 * @param params the layout parameters of the child 3964 * 3965 * @see #removeDetachedView(View, boolean) 3966 * @see #detachAllViewsFromParent() 3967 * @see #detachViewFromParent(View) 3968 * @see #detachViewFromParent(int) 3969 */ 3970 protected void attachViewToParent(View child, int index, LayoutParams params) { 3971 child.mLayoutParams = params; 3972 3973 if (index < 0) { 3974 index = mChildrenCount; 3975 } 3976 3977 addInArray(child, index); 3978 3979 child.mParent = this; 3980 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 3981 & ~PFLAG_DRAWING_CACHE_VALID) 3982 | PFLAG_DRAWN | PFLAG_INVALIDATED; 3983 this.mPrivateFlags |= PFLAG_INVALIDATED; 3984 3985 if (child.hasFocus()) { 3986 requestChildFocus(child, child.findFocus()); 3987 } 3988 } 3989 3990 /** 3991 * Detaches a view from its parent. Detaching a view should be followed 3992 * either by a call to 3993 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 3994 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 3995 * temporary; reattachment or removal should happen within the same drawing cycle as 3996 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 3997 * call to {@link #getChildAt(int)}. 3998 * 3999 * @param child the child to detach 4000 * 4001 * @see #detachViewFromParent(int) 4002 * @see #detachViewsFromParent(int, int) 4003 * @see #detachAllViewsFromParent() 4004 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4005 * @see #removeDetachedView(View, boolean) 4006 */ 4007 protected void detachViewFromParent(View child) { 4008 removeFromArray(indexOfChild(child)); 4009 } 4010 4011 /** 4012 * Detaches a view from its parent. Detaching a view should be followed 4013 * either by a call to 4014 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4015 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4016 * temporary; reattachment or removal should happen within the same drawing cycle as 4017 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4018 * call to {@link #getChildAt(int)}. 4019 * 4020 * @param index the index of the child to detach 4021 * 4022 * @see #detachViewFromParent(View) 4023 * @see #detachAllViewsFromParent() 4024 * @see #detachViewsFromParent(int, int) 4025 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4026 * @see #removeDetachedView(View, boolean) 4027 */ 4028 protected void detachViewFromParent(int index) { 4029 removeFromArray(index); 4030 } 4031 4032 /** 4033 * Detaches a range of views from their parents. Detaching a view should be followed 4034 * either by a call to 4035 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4036 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4037 * temporary; reattachment or removal should happen within the same drawing cycle as 4038 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4039 * call to {@link #getChildAt(int)}. 4040 * 4041 * @param start the first index of the childrend range to detach 4042 * @param count the number of children to detach 4043 * 4044 * @see #detachViewFromParent(View) 4045 * @see #detachViewFromParent(int) 4046 * @see #detachAllViewsFromParent() 4047 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4048 * @see #removeDetachedView(View, boolean) 4049 */ 4050 protected void detachViewsFromParent(int start, int count) { 4051 removeFromArray(start, count); 4052 } 4053 4054 /** 4055 * Detaches all views from the parent. Detaching a view should be followed 4056 * either by a call to 4057 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4058 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4059 * temporary; reattachment or removal should happen within the same drawing cycle as 4060 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4061 * call to {@link #getChildAt(int)}. 4062 * 4063 * @see #detachViewFromParent(View) 4064 * @see #detachViewFromParent(int) 4065 * @see #detachViewsFromParent(int, int) 4066 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4067 * @see #removeDetachedView(View, boolean) 4068 */ 4069 protected void detachAllViewsFromParent() { 4070 final int count = mChildrenCount; 4071 if (count <= 0) { 4072 return; 4073 } 4074 4075 final View[] children = mChildren; 4076 mChildrenCount = 0; 4077 4078 for (int i = count - 1; i >= 0; i--) { 4079 children[i].mParent = null; 4080 children[i] = null; 4081 } 4082 } 4083 4084 /** 4085 * Don't call or override this method. It is used for the implementation of 4086 * the view hierarchy. 4087 */ 4088 public final void invalidateChild(View child, final Rect dirty) { 4089 ViewParent parent = this; 4090 4091 final AttachInfo attachInfo = mAttachInfo; 4092 if (attachInfo != null) { 4093 // If the child is drawing an animation, we want to copy this flag onto 4094 // ourselves and the parent to make sure the invalidate request goes 4095 // through 4096 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4097 == PFLAG_DRAW_ANIMATION; 4098 4099 // Check whether the child that requests the invalidate is fully opaque 4100 // Views being animated or transformed are not considered opaque because we may 4101 // be invalidating their old position and need the parent to paint behind them. 4102 Matrix childMatrix = child.getMatrix(); 4103 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4104 child.getAnimation() == null && childMatrix.isIdentity(); 4105 // Mark the child as dirty, using the appropriate flag 4106 // Make sure we do not set both flags at the same time 4107 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4108 4109 if (child.mLayerType != LAYER_TYPE_NONE) { 4110 mPrivateFlags |= PFLAG_INVALIDATED; 4111 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4112 child.mLocalDirtyRect.union(dirty); 4113 } 4114 4115 final int[] location = attachInfo.mInvalidateChildLocation; 4116 location[CHILD_LEFT_INDEX] = child.mLeft; 4117 location[CHILD_TOP_INDEX] = child.mTop; 4118 if (!childMatrix.isIdentity() || 4119 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4120 RectF boundingRect = attachInfo.mTmpTransformRect; 4121 boundingRect.set(dirty); 4122 Matrix transformMatrix; 4123 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4124 Transformation t = attachInfo.mTmpTransformation; 4125 boolean transformed = getChildStaticTransformation(child, t); 4126 if (transformed) { 4127 transformMatrix = attachInfo.mTmpMatrix; 4128 transformMatrix.set(t.getMatrix()); 4129 if (!childMatrix.isIdentity()) { 4130 transformMatrix.preConcat(childMatrix); 4131 } 4132 } else { 4133 transformMatrix = childMatrix; 4134 } 4135 } else { 4136 transformMatrix = childMatrix; 4137 } 4138 transformMatrix.mapRect(boundingRect); 4139 dirty.set((int) (boundingRect.left - 0.5f), 4140 (int) (boundingRect.top - 0.5f), 4141 (int) (boundingRect.right + 0.5f), 4142 (int) (boundingRect.bottom + 0.5f)); 4143 } 4144 4145 do { 4146 View view = null; 4147 if (parent instanceof View) { 4148 view = (View) parent; 4149 } 4150 4151 if (drawAnimation) { 4152 if (view != null) { 4153 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4154 } else if (parent instanceof ViewRootImpl) { 4155 ((ViewRootImpl) parent).mIsAnimating = true; 4156 } 4157 } 4158 4159 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4160 // flag coming from the child that initiated the invalidate 4161 if (view != null) { 4162 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4163 view.getSolidColor() == 0) { 4164 opaqueFlag = PFLAG_DIRTY; 4165 } 4166 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4167 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4168 } 4169 } 4170 4171 parent = parent.invalidateChildInParent(location, dirty); 4172 if (view != null) { 4173 // Account for transform on current parent 4174 Matrix m = view.getMatrix(); 4175 if (!m.isIdentity()) { 4176 RectF boundingRect = attachInfo.mTmpTransformRect; 4177 boundingRect.set(dirty); 4178 m.mapRect(boundingRect); 4179 dirty.set((int) (boundingRect.left - 0.5f), 4180 (int) (boundingRect.top - 0.5f), 4181 (int) (boundingRect.right + 0.5f), 4182 (int) (boundingRect.bottom + 0.5f)); 4183 } 4184 } 4185 } while (parent != null); 4186 } 4187 } 4188 4189 /** 4190 * Don't call or override this method. It is used for the implementation of 4191 * the view hierarchy. 4192 * 4193 * This implementation returns null if this ViewGroup does not have a parent, 4194 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4195 * does not intersect with this ViewGroup's bounds. 4196 */ 4197 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4198 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4199 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4200 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4201 FLAG_OPTIMIZE_INVALIDATE) { 4202 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4203 location[CHILD_TOP_INDEX] - mScrollY); 4204 4205 final int left = mLeft; 4206 final int top = mTop; 4207 4208 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4209 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4210 dirty.setEmpty(); 4211 } 4212 } 4213 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4214 4215 location[CHILD_LEFT_INDEX] = left; 4216 location[CHILD_TOP_INDEX] = top; 4217 4218 if (mLayerType != LAYER_TYPE_NONE) { 4219 mPrivateFlags |= PFLAG_INVALIDATED; 4220 mLocalDirtyRect.union(dirty); 4221 } 4222 4223 return mParent; 4224 4225 } else { 4226 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4227 4228 location[CHILD_LEFT_INDEX] = mLeft; 4229 location[CHILD_TOP_INDEX] = mTop; 4230 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4231 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4232 } else { 4233 // in case the dirty rect extends outside the bounds of this container 4234 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4235 } 4236 4237 if (mLayerType != LAYER_TYPE_NONE) { 4238 mPrivateFlags |= PFLAG_INVALIDATED; 4239 mLocalDirtyRect.union(dirty); 4240 } 4241 4242 return mParent; 4243 } 4244 } 4245 4246 return null; 4247 } 4248 4249 /** 4250 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4251 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4252 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4253 * 4254 * @hide 4255 */ 4256 public void invalidateChildFast(View child, final Rect dirty) { 4257 ViewParent parent = this; 4258 4259 final AttachInfo attachInfo = mAttachInfo; 4260 if (attachInfo != null) { 4261 if (child.mLayerType != LAYER_TYPE_NONE) { 4262 child.mLocalDirtyRect.union(dirty); 4263 } 4264 4265 int left = child.mLeft; 4266 int top = child.mTop; 4267 if (!child.getMatrix().isIdentity()) { 4268 child.transformRect(dirty); 4269 } 4270 4271 do { 4272 if (parent instanceof ViewGroup) { 4273 ViewGroup parentVG = (ViewGroup) parent; 4274 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4275 // Layered parents should be recreated, not just re-issued 4276 parentVG.invalidate(); 4277 parent = null; 4278 } else { 4279 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4280 left = parentVG.mLeft; 4281 top = parentVG.mTop; 4282 } 4283 } else { 4284 // Reached the top; this calls into the usual invalidate method in 4285 // ViewRootImpl, which schedules a traversal 4286 final int[] location = attachInfo.mInvalidateChildLocation; 4287 location[0] = left; 4288 location[1] = top; 4289 parent = parent.invalidateChildInParent(location, dirty); 4290 } 4291 } while (parent != null); 4292 } 4293 } 4294 4295 /** 4296 * Quick invalidation method that simply transforms the dirty rect into the parent's 4297 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4298 */ 4299 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4300 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4301 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4302 dirty.offset(left - mScrollX, top - mScrollY); 4303 4304 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4305 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4306 4307 if (mLayerType != LAYER_TYPE_NONE) { 4308 mLocalDirtyRect.union(dirty); 4309 } 4310 if (!getMatrix().isIdentity()) { 4311 transformRect(dirty); 4312 } 4313 4314 return mParent; 4315 } 4316 } 4317 4318 return null; 4319 } 4320 4321 /** 4322 * Offset a rectangle that is in a descendant's coordinate 4323 * space into our coordinate space. 4324 * @param descendant A descendant of this view 4325 * @param rect A rectangle defined in descendant's coordinate space. 4326 */ 4327 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4328 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4329 } 4330 4331 /** 4332 * Offset a rectangle that is in our coordinate space into an ancestor's 4333 * coordinate space. 4334 * @param descendant A descendant of this view 4335 * @param rect A rectangle defined in descendant's coordinate space. 4336 */ 4337 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4338 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4339 } 4340 4341 /** 4342 * Helper method that offsets a rect either from parent to descendant or 4343 * descendant to parent. 4344 */ 4345 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4346 boolean offsetFromChildToParent, boolean clipToBounds) { 4347 4348 // already in the same coord system :) 4349 if (descendant == this) { 4350 return; 4351 } 4352 4353 ViewParent theParent = descendant.mParent; 4354 4355 // search and offset up to the parent 4356 while ((theParent != null) 4357 && (theParent instanceof View) 4358 && (theParent != this)) { 4359 4360 if (offsetFromChildToParent) { 4361 rect.offset(descendant.mLeft - descendant.mScrollX, 4362 descendant.mTop - descendant.mScrollY); 4363 if (clipToBounds) { 4364 View p = (View) theParent; 4365 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4366 } 4367 } else { 4368 if (clipToBounds) { 4369 View p = (View) theParent; 4370 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4371 } 4372 rect.offset(descendant.mScrollX - descendant.mLeft, 4373 descendant.mScrollY - descendant.mTop); 4374 } 4375 4376 descendant = (View) theParent; 4377 theParent = descendant.mParent; 4378 } 4379 4380 // now that we are up to this view, need to offset one more time 4381 // to get into our coordinate space 4382 if (theParent == this) { 4383 if (offsetFromChildToParent) { 4384 rect.offset(descendant.mLeft - descendant.mScrollX, 4385 descendant.mTop - descendant.mScrollY); 4386 } else { 4387 rect.offset(descendant.mScrollX - descendant.mLeft, 4388 descendant.mScrollY - descendant.mTop); 4389 } 4390 } else { 4391 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4392 } 4393 } 4394 4395 /** 4396 * Offset the vertical location of all children of this view by the specified number of pixels. 4397 * 4398 * @param offset the number of pixels to offset 4399 * 4400 * @hide 4401 */ 4402 public void offsetChildrenTopAndBottom(int offset) { 4403 final int count = mChildrenCount; 4404 final View[] children = mChildren; 4405 4406 for (int i = 0; i < count; i++) { 4407 final View v = children[i]; 4408 v.mTop += offset; 4409 v.mBottom += offset; 4410 if (v.mDisplayList != null) { 4411 v.mDisplayList.offsetTopBottom(offset); 4412 invalidateViewProperty(false, false); 4413 } 4414 } 4415 } 4416 4417 /** 4418 * {@inheritDoc} 4419 */ 4420 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4421 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4422 // but for some simple tests it can be useful. If we don't have attach info this 4423 // will allocate memory. 4424 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4425 rect.set(r); 4426 4427 if (!child.hasIdentityMatrix()) { 4428 child.getMatrix().mapRect(rect); 4429 } 4430 4431 int dx = child.mLeft - mScrollX; 4432 int dy = child.mTop - mScrollY; 4433 4434 rect.offset(dx, dy); 4435 4436 if (offset != null) { 4437 if (!child.hasIdentityMatrix()) { 4438 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4439 : new float[2]; 4440 position[0] = offset.x; 4441 position[1] = offset.y; 4442 child.getMatrix().mapPoints(position); 4443 offset.x = (int) (position[0] + 0.5f); 4444 offset.y = (int) (position[1] + 0.5f); 4445 } 4446 offset.x += dx; 4447 offset.y += dy; 4448 } 4449 4450 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4451 if (mParent == null) return true; 4452 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4453 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4454 return mParent.getChildVisibleRect(this, r, offset); 4455 } 4456 4457 return false; 4458 } 4459 4460 /** 4461 * {@inheritDoc} 4462 */ 4463 @Override 4464 public final void layout(int l, int t, int r, int b) { 4465 if (mTransition == null || !mTransition.isChangingLayout()) { 4466 if (mTransition != null) { 4467 mTransition.layoutChange(this); 4468 } 4469 super.layout(l, t, r, b); 4470 } else { 4471 // record the fact that we noop'd it; request layout when transition finishes 4472 mLayoutSuppressed = true; 4473 } 4474 } 4475 4476 /** 4477 * {@inheritDoc} 4478 */ 4479 @Override 4480 protected abstract void onLayout(boolean changed, 4481 int l, int t, int r, int b); 4482 4483 /** 4484 * Indicates whether the view group has the ability to animate its children 4485 * after the first layout. 4486 * 4487 * @return true if the children can be animated, false otherwise 4488 */ 4489 protected boolean canAnimate() { 4490 return mLayoutAnimationController != null; 4491 } 4492 4493 /** 4494 * Runs the layout animation. Calling this method triggers a relayout of 4495 * this view group. 4496 */ 4497 public void startLayoutAnimation() { 4498 if (mLayoutAnimationController != null) { 4499 mGroupFlags |= FLAG_RUN_ANIMATION; 4500 requestLayout(); 4501 } 4502 } 4503 4504 /** 4505 * Schedules the layout animation to be played after the next layout pass 4506 * of this view group. This can be used to restart the layout animation 4507 * when the content of the view group changes or when the activity is 4508 * paused and resumed. 4509 */ 4510 public void scheduleLayoutAnimation() { 4511 mGroupFlags |= FLAG_RUN_ANIMATION; 4512 } 4513 4514 /** 4515 * Sets the layout animation controller used to animate the group's 4516 * children after the first layout. 4517 * 4518 * @param controller the animation controller 4519 */ 4520 public void setLayoutAnimation(LayoutAnimationController controller) { 4521 mLayoutAnimationController = controller; 4522 if (mLayoutAnimationController != null) { 4523 mGroupFlags |= FLAG_RUN_ANIMATION; 4524 } 4525 } 4526 4527 /** 4528 * Returns the layout animation controller used to animate the group's 4529 * children. 4530 * 4531 * @return the current animation controller 4532 */ 4533 public LayoutAnimationController getLayoutAnimation() { 4534 return mLayoutAnimationController; 4535 } 4536 4537 /** 4538 * Indicates whether the children's drawing cache is used during a layout 4539 * animation. By default, the drawing cache is enabled but this will prevent 4540 * nested layout animations from working. To nest animations, you must disable 4541 * the cache. 4542 * 4543 * @return true if the animation cache is enabled, false otherwise 4544 * 4545 * @see #setAnimationCacheEnabled(boolean) 4546 * @see View#setDrawingCacheEnabled(boolean) 4547 */ 4548 @ViewDebug.ExportedProperty 4549 public boolean isAnimationCacheEnabled() { 4550 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4551 } 4552 4553 /** 4554 * Enables or disables the children's drawing cache during a layout animation. 4555 * By default, the drawing cache is enabled but this will prevent nested 4556 * layout animations from working. To nest animations, you must disable the 4557 * cache. 4558 * 4559 * @param enabled true to enable the animation cache, false otherwise 4560 * 4561 * @see #isAnimationCacheEnabled() 4562 * @see View#setDrawingCacheEnabled(boolean) 4563 */ 4564 public void setAnimationCacheEnabled(boolean enabled) { 4565 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4566 } 4567 4568 /** 4569 * Indicates whether this ViewGroup will always try to draw its children using their 4570 * drawing cache. By default this property is enabled. 4571 * 4572 * @return true if the animation cache is enabled, false otherwise 4573 * 4574 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4575 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4576 * @see View#setDrawingCacheEnabled(boolean) 4577 */ 4578 @ViewDebug.ExportedProperty(category = "drawing") 4579 public boolean isAlwaysDrawnWithCacheEnabled() { 4580 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4581 } 4582 4583 /** 4584 * Indicates whether this ViewGroup will always try to draw its children using their 4585 * drawing cache. This property can be set to true when the cache rendering is 4586 * slightly different from the children's normal rendering. Renderings can be different, 4587 * for instance, when the cache's quality is set to low. 4588 * 4589 * When this property is disabled, the ViewGroup will use the drawing cache of its 4590 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4591 * when to start using the drawing cache and when to stop using it. 4592 * 4593 * @param always true to always draw with the drawing cache, false otherwise 4594 * 4595 * @see #isAlwaysDrawnWithCacheEnabled() 4596 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4597 * @see View#setDrawingCacheEnabled(boolean) 4598 * @see View#setDrawingCacheQuality(int) 4599 */ 4600 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4601 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4602 } 4603 4604 /** 4605 * Indicates whether the ViewGroup is currently drawing its children using 4606 * their drawing cache. 4607 * 4608 * @return true if children should be drawn with their cache, false otherwise 4609 * 4610 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4611 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4612 */ 4613 @ViewDebug.ExportedProperty(category = "drawing") 4614 protected boolean isChildrenDrawnWithCacheEnabled() { 4615 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4616 } 4617 4618 /** 4619 * Tells the ViewGroup to draw its children using their drawing cache. This property 4620 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4621 * will be used only if it has been enabled. 4622 * 4623 * Subclasses should call this method to start and stop using the drawing cache when 4624 * they perform performance sensitive operations, like scrolling or animating. 4625 * 4626 * @param enabled true if children should be drawn with their cache, false otherwise 4627 * 4628 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4629 * @see #isChildrenDrawnWithCacheEnabled() 4630 */ 4631 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4632 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4633 } 4634 4635 /** 4636 * Indicates whether the ViewGroup is drawing its children in the order defined by 4637 * {@link #getChildDrawingOrder(int, int)}. 4638 * 4639 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4640 * false otherwise 4641 * 4642 * @see #setChildrenDrawingOrderEnabled(boolean) 4643 * @see #getChildDrawingOrder(int, int) 4644 */ 4645 @ViewDebug.ExportedProperty(category = "drawing") 4646 protected boolean isChildrenDrawingOrderEnabled() { 4647 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4648 } 4649 4650 /** 4651 * Tells the ViewGroup whether to draw its children in the order defined by the method 4652 * {@link #getChildDrawingOrder(int, int)}. 4653 * 4654 * @param enabled true if the order of the children when drawing is determined by 4655 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4656 * 4657 * @see #isChildrenDrawingOrderEnabled() 4658 * @see #getChildDrawingOrder(int, int) 4659 */ 4660 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4661 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4662 } 4663 4664 private void setBooleanFlag(int flag, boolean value) { 4665 if (value) { 4666 mGroupFlags |= flag; 4667 } else { 4668 mGroupFlags &= ~flag; 4669 } 4670 } 4671 4672 /** 4673 * Returns an integer indicating what types of drawing caches are kept in memory. 4674 * 4675 * @see #setPersistentDrawingCache(int) 4676 * @see #setAnimationCacheEnabled(boolean) 4677 * 4678 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4679 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4680 * and {@link #PERSISTENT_ALL_CACHES} 4681 */ 4682 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4683 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4684 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4685 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4686 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4687 }) 4688 public int getPersistentDrawingCache() { 4689 return mPersistentDrawingCache; 4690 } 4691 4692 /** 4693 * Indicates what types of drawing caches should be kept in memory after 4694 * they have been created. 4695 * 4696 * @see #getPersistentDrawingCache() 4697 * @see #setAnimationCacheEnabled(boolean) 4698 * 4699 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4700 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4701 * and {@link #PERSISTENT_ALL_CACHES} 4702 */ 4703 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4704 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4705 } 4706 4707 /** 4708 * Returns the basis of alignment during layout operations on this view group: 4709 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4710 * 4711 * @return the layout mode to use during layout operations 4712 * 4713 * @see #setLayoutMode(int) 4714 */ 4715 public int getLayoutMode() { 4716 return mLayoutMode; 4717 } 4718 4719 /** 4720 * Sets the basis of alignment during the layout of this view group. 4721 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4722 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4723 * <p> 4724 * The default is {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4725 * 4726 * @param layoutMode the layout mode to use during layout operations 4727 * 4728 * @see #getLayoutMode() 4729 */ 4730 public void setLayoutMode(int layoutMode) { 4731 if (mLayoutMode != layoutMode) { 4732 mLayoutMode = layoutMode; 4733 requestLayout(); 4734 } 4735 } 4736 4737 /** 4738 * Returns a new set of layout parameters based on the supplied attributes set. 4739 * 4740 * @param attrs the attributes to build the layout parameters from 4741 * 4742 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4743 * of its descendants 4744 */ 4745 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4746 return new LayoutParams(getContext(), attrs); 4747 } 4748 4749 /** 4750 * Returns a safe set of layout parameters based on the supplied layout params. 4751 * When a ViewGroup is passed a View whose layout params do not pass the test of 4752 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4753 * is invoked. This method should return a new set of layout params suitable for 4754 * this ViewGroup, possibly by copying the appropriate attributes from the 4755 * specified set of layout params. 4756 * 4757 * @param p The layout parameters to convert into a suitable set of layout parameters 4758 * for this ViewGroup. 4759 * 4760 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4761 * of its descendants 4762 */ 4763 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4764 return p; 4765 } 4766 4767 /** 4768 * Returns a set of default layout parameters. These parameters are requested 4769 * when the View passed to {@link #addView(View)} has no layout parameters 4770 * already set. If null is returned, an exception is thrown from addView. 4771 * 4772 * @return a set of default layout parameters or null 4773 */ 4774 protected LayoutParams generateDefaultLayoutParams() { 4775 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4776 } 4777 4778 /** 4779 * {@inheritDoc} 4780 */ 4781 @Override 4782 protected void debug(int depth) { 4783 super.debug(depth); 4784 String output; 4785 4786 if (mFocused != null) { 4787 output = debugIndent(depth); 4788 output += "mFocused"; 4789 Log.d(VIEW_LOG_TAG, output); 4790 } 4791 if (mChildrenCount != 0) { 4792 output = debugIndent(depth); 4793 output += "{"; 4794 Log.d(VIEW_LOG_TAG, output); 4795 } 4796 int count = mChildrenCount; 4797 for (int i = 0; i < count; i++) { 4798 View child = mChildren[i]; 4799 child.debug(depth + 1); 4800 } 4801 4802 if (mChildrenCount != 0) { 4803 output = debugIndent(depth); 4804 output += "}"; 4805 Log.d(VIEW_LOG_TAG, output); 4806 } 4807 } 4808 4809 /** 4810 * Returns the position in the group of the specified child view. 4811 * 4812 * @param child the view for which to get the position 4813 * @return a positive integer representing the position of the view in the 4814 * group, or -1 if the view does not exist in the group 4815 */ 4816 public int indexOfChild(View child) { 4817 final int count = mChildrenCount; 4818 final View[] children = mChildren; 4819 for (int i = 0; i < count; i++) { 4820 if (children[i] == child) { 4821 return i; 4822 } 4823 } 4824 return -1; 4825 } 4826 4827 /** 4828 * Returns the number of children in the group. 4829 * 4830 * @return a positive integer representing the number of children in 4831 * the group 4832 */ 4833 public int getChildCount() { 4834 return mChildrenCount; 4835 } 4836 4837 /** 4838 * Returns the view at the specified position in the group. 4839 * 4840 * @param index the position at which to get the view from 4841 * @return the view at the specified position or null if the position 4842 * does not exist within the group 4843 */ 4844 public View getChildAt(int index) { 4845 if (index < 0 || index >= mChildrenCount) { 4846 return null; 4847 } 4848 return mChildren[index]; 4849 } 4850 4851 /** 4852 * Ask all of the children of this view to measure themselves, taking into 4853 * account both the MeasureSpec requirements for this view and its padding. 4854 * We skip children that are in the GONE state The heavy lifting is done in 4855 * getChildMeasureSpec. 4856 * 4857 * @param widthMeasureSpec The width requirements for this view 4858 * @param heightMeasureSpec The height requirements for this view 4859 */ 4860 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4861 final int size = mChildrenCount; 4862 final View[] children = mChildren; 4863 for (int i = 0; i < size; ++i) { 4864 final View child = children[i]; 4865 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4866 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4867 } 4868 } 4869 } 4870 4871 /** 4872 * Ask one of the children of this view to measure itself, taking into 4873 * account both the MeasureSpec requirements for this view and its padding. 4874 * The heavy lifting is done in getChildMeasureSpec. 4875 * 4876 * @param child The child to measure 4877 * @param parentWidthMeasureSpec The width requirements for this view 4878 * @param parentHeightMeasureSpec The height requirements for this view 4879 */ 4880 protected void measureChild(View child, int parentWidthMeasureSpec, 4881 int parentHeightMeasureSpec) { 4882 final LayoutParams lp = child.getLayoutParams(); 4883 4884 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4885 mPaddingLeft + mPaddingRight, lp.width); 4886 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4887 mPaddingTop + mPaddingBottom, lp.height); 4888 4889 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4890 } 4891 4892 /** 4893 * Ask one of the children of this view to measure itself, taking into 4894 * account both the MeasureSpec requirements for this view and its padding 4895 * and margins. The child must have MarginLayoutParams The heavy lifting is 4896 * done in getChildMeasureSpec. 4897 * 4898 * @param child The child to measure 4899 * @param parentWidthMeasureSpec The width requirements for this view 4900 * @param widthUsed Extra space that has been used up by the parent 4901 * horizontally (possibly by other children of the parent) 4902 * @param parentHeightMeasureSpec The height requirements for this view 4903 * @param heightUsed Extra space that has been used up by the parent 4904 * vertically (possibly by other children of the parent) 4905 */ 4906 protected void measureChildWithMargins(View child, 4907 int parentWidthMeasureSpec, int widthUsed, 4908 int parentHeightMeasureSpec, int heightUsed) { 4909 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4910 4911 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4912 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4913 + widthUsed, lp.width); 4914 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4915 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4916 + heightUsed, lp.height); 4917 4918 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4919 } 4920 4921 /** 4922 * Does the hard part of measureChildren: figuring out the MeasureSpec to 4923 * pass to a particular child. This method figures out the right MeasureSpec 4924 * for one dimension (height or width) of one child view. 4925 * 4926 * The goal is to combine information from our MeasureSpec with the 4927 * LayoutParams of the child to get the best possible results. For example, 4928 * if the this view knows its size (because its MeasureSpec has a mode of 4929 * EXACTLY), and the child has indicated in its LayoutParams that it wants 4930 * to be the same size as the parent, the parent should ask the child to 4931 * layout given an exact size. 4932 * 4933 * @param spec The requirements for this view 4934 * @param padding The padding of this view for the current dimension and 4935 * margins, if applicable 4936 * @param childDimension How big the child wants to be in the current 4937 * dimension 4938 * @return a MeasureSpec integer for the child 4939 */ 4940 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 4941 int specMode = MeasureSpec.getMode(spec); 4942 int specSize = MeasureSpec.getSize(spec); 4943 4944 int size = Math.max(0, specSize - padding); 4945 4946 int resultSize = 0; 4947 int resultMode = 0; 4948 4949 switch (specMode) { 4950 // Parent has imposed an exact size on us 4951 case MeasureSpec.EXACTLY: 4952 if (childDimension >= 0) { 4953 resultSize = childDimension; 4954 resultMode = MeasureSpec.EXACTLY; 4955 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4956 // Child wants to be our size. So be it. 4957 resultSize = size; 4958 resultMode = MeasureSpec.EXACTLY; 4959 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4960 // Child wants to determine its own size. It can't be 4961 // bigger than us. 4962 resultSize = size; 4963 resultMode = MeasureSpec.AT_MOST; 4964 } 4965 break; 4966 4967 // Parent has imposed a maximum size on us 4968 case MeasureSpec.AT_MOST: 4969 if (childDimension >= 0) { 4970 // Child wants a specific size... so be it 4971 resultSize = childDimension; 4972 resultMode = MeasureSpec.EXACTLY; 4973 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4974 // Child wants to be our size, but our size is not fixed. 4975 // Constrain child to not be bigger than us. 4976 resultSize = size; 4977 resultMode = MeasureSpec.AT_MOST; 4978 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4979 // Child wants to determine its own size. It can't be 4980 // bigger than us. 4981 resultSize = size; 4982 resultMode = MeasureSpec.AT_MOST; 4983 } 4984 break; 4985 4986 // Parent asked to see how big we want to be 4987 case MeasureSpec.UNSPECIFIED: 4988 if (childDimension >= 0) { 4989 // Child wants a specific size... let him have it 4990 resultSize = childDimension; 4991 resultMode = MeasureSpec.EXACTLY; 4992 } else if (childDimension == LayoutParams.MATCH_PARENT) { 4993 // Child wants to be our size... find out how big it should 4994 // be 4995 resultSize = 0; 4996 resultMode = MeasureSpec.UNSPECIFIED; 4997 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 4998 // Child wants to determine its own size.... find out how 4999 // big it should be 5000 resultSize = 0; 5001 resultMode = MeasureSpec.UNSPECIFIED; 5002 } 5003 break; 5004 } 5005 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5006 } 5007 5008 5009 /** 5010 * Removes any pending animations for views that have been removed. Call 5011 * this if you don't want animations for exiting views to stack up. 5012 */ 5013 public void clearDisappearingChildren() { 5014 if (mDisappearingChildren != null) { 5015 mDisappearingChildren.clear(); 5016 invalidate(); 5017 } 5018 } 5019 5020 /** 5021 * Add a view which is removed from mChildren but still needs animation 5022 * 5023 * @param v View to add 5024 */ 5025 private void addDisappearingView(View v) { 5026 ArrayList<View> disappearingChildren = mDisappearingChildren; 5027 5028 if (disappearingChildren == null) { 5029 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5030 } 5031 5032 disappearingChildren.add(v); 5033 } 5034 5035 /** 5036 * Cleanup a view when its animation is done. This may mean removing it from 5037 * the list of disappearing views. 5038 * 5039 * @param view The view whose animation has finished 5040 * @param animation The animation, cannot be null 5041 */ 5042 void finishAnimatingView(final View view, Animation animation) { 5043 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5044 if (disappearingChildren != null) { 5045 if (disappearingChildren.contains(view)) { 5046 disappearingChildren.remove(view); 5047 5048 if (view.mAttachInfo != null) { 5049 view.dispatchDetachedFromWindow(); 5050 } 5051 5052 view.clearAnimation(); 5053 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5054 } 5055 } 5056 5057 if (animation != null && !animation.getFillAfter()) { 5058 view.clearAnimation(); 5059 } 5060 5061 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5062 view.onAnimationEnd(); 5063 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5064 // so we'd rather be safe than sorry 5065 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5066 // Draw one more frame after the animation is done 5067 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5068 } 5069 } 5070 5071 /** 5072 * Utility function called by View during invalidation to determine whether a view that 5073 * is invisible or gone should still be invalidated because it is being transitioned (and 5074 * therefore still needs to be drawn). 5075 */ 5076 boolean isViewTransitioning(View view) { 5077 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5078 } 5079 5080 /** 5081 * This method tells the ViewGroup that the given View object, which should have this 5082 * ViewGroup as its parent, 5083 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5084 * is removed from its parent. This allows animations, such as those used by 5085 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5086 * the removal of views. A call to this method should always be accompanied by a later call 5087 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5088 * so that the View finally gets removed. 5089 * 5090 * @param view The View object to be kept visible even if it gets removed from its parent. 5091 */ 5092 public void startViewTransition(View view) { 5093 if (view.mParent == this) { 5094 if (mTransitioningViews == null) { 5095 mTransitioningViews = new ArrayList<View>(); 5096 } 5097 mTransitioningViews.add(view); 5098 } 5099 } 5100 5101 /** 5102 * This method should always be called following an earlier call to 5103 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5104 * and will no longer be displayed. Note that this method does not perform the functionality 5105 * of removing a view from its parent; it just discontinues the display of a View that 5106 * has previously been removed. 5107 * 5108 * @return view The View object that has been removed but is being kept around in the visible 5109 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5110 */ 5111 public void endViewTransition(View view) { 5112 if (mTransitioningViews != null) { 5113 mTransitioningViews.remove(view); 5114 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5115 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5116 disappearingChildren.remove(view); 5117 if (mVisibilityChangingChildren != null && 5118 mVisibilityChangingChildren.contains(view)) { 5119 mVisibilityChangingChildren.remove(view); 5120 } else { 5121 if (view.mAttachInfo != null) { 5122 view.dispatchDetachedFromWindow(); 5123 } 5124 if (view.mParent != null) { 5125 view.mParent = null; 5126 } 5127 } 5128 invalidate(); 5129 } 5130 } 5131 } 5132 5133 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5134 new LayoutTransition.TransitionListener() { 5135 @Override 5136 public void startTransition(LayoutTransition transition, ViewGroup container, 5137 View view, int transitionType) { 5138 // We only care about disappearing items, since we need special logic to keep 5139 // those items visible after they've been 'removed' 5140 if (transitionType == LayoutTransition.DISAPPEARING) { 5141 startViewTransition(view); 5142 } 5143 } 5144 5145 @Override 5146 public void endTransition(LayoutTransition transition, ViewGroup container, 5147 View view, int transitionType) { 5148 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5149 requestLayout(); 5150 mLayoutSuppressed = false; 5151 } 5152 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5153 endViewTransition(view); 5154 } 5155 } 5156 }; 5157 5158 /** 5159 * {@inheritDoc} 5160 */ 5161 @Override 5162 public boolean gatherTransparentRegion(Region region) { 5163 // If no transparent regions requested, we are always opaque. 5164 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5165 if (meOpaque && region == null) { 5166 // The caller doesn't care about the region, so stop now. 5167 return true; 5168 } 5169 super.gatherTransparentRegion(region); 5170 final View[] children = mChildren; 5171 final int count = mChildrenCount; 5172 boolean noneOfTheChildrenAreTransparent = true; 5173 for (int i = 0; i < count; i++) { 5174 final View child = children[i]; 5175 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5176 if (!child.gatherTransparentRegion(region)) { 5177 noneOfTheChildrenAreTransparent = false; 5178 } 5179 } 5180 } 5181 return meOpaque || noneOfTheChildrenAreTransparent; 5182 } 5183 5184 /** 5185 * {@inheritDoc} 5186 */ 5187 public void requestTransparentRegion(View child) { 5188 if (child != null) { 5189 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5190 if (mParent != null) { 5191 mParent.requestTransparentRegion(this); 5192 } 5193 } 5194 } 5195 5196 5197 @Override 5198 protected boolean fitSystemWindows(Rect insets) { 5199 boolean done = super.fitSystemWindows(insets); 5200 if (!done) { 5201 final int count = mChildrenCount; 5202 final View[] children = mChildren; 5203 for (int i = 0; i < count; i++) { 5204 done = children[i].fitSystemWindows(insets); 5205 if (done) { 5206 break; 5207 } 5208 } 5209 } 5210 return done; 5211 } 5212 5213 /** 5214 * Returns the animation listener to which layout animation events are 5215 * sent. 5216 * 5217 * @return an {@link android.view.animation.Animation.AnimationListener} 5218 */ 5219 public Animation.AnimationListener getLayoutAnimationListener() { 5220 return mAnimationListener; 5221 } 5222 5223 @Override 5224 protected void drawableStateChanged() { 5225 super.drawableStateChanged(); 5226 5227 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5228 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5229 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5230 + " child has duplicateParentState set to true"); 5231 } 5232 5233 final View[] children = mChildren; 5234 final int count = mChildrenCount; 5235 5236 for (int i = 0; i < count; i++) { 5237 final View child = children[i]; 5238 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5239 child.refreshDrawableState(); 5240 } 5241 } 5242 } 5243 } 5244 5245 @Override 5246 public void jumpDrawablesToCurrentState() { 5247 super.jumpDrawablesToCurrentState(); 5248 final View[] children = mChildren; 5249 final int count = mChildrenCount; 5250 for (int i = 0; i < count; i++) { 5251 children[i].jumpDrawablesToCurrentState(); 5252 } 5253 } 5254 5255 @Override 5256 protected int[] onCreateDrawableState(int extraSpace) { 5257 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5258 return super.onCreateDrawableState(extraSpace); 5259 } 5260 5261 int need = 0; 5262 int n = getChildCount(); 5263 for (int i = 0; i < n; i++) { 5264 int[] childState = getChildAt(i).getDrawableState(); 5265 5266 if (childState != null) { 5267 need += childState.length; 5268 } 5269 } 5270 5271 int[] state = super.onCreateDrawableState(extraSpace + need); 5272 5273 for (int i = 0; i < n; i++) { 5274 int[] childState = getChildAt(i).getDrawableState(); 5275 5276 if (childState != null) { 5277 state = mergeDrawableStates(state, childState); 5278 } 5279 } 5280 5281 return state; 5282 } 5283 5284 /** 5285 * Sets whether this ViewGroup's drawable states also include 5286 * its children's drawable states. This is used, for example, to 5287 * make a group appear to be focused when its child EditText or button 5288 * is focused. 5289 */ 5290 public void setAddStatesFromChildren(boolean addsStates) { 5291 if (addsStates) { 5292 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5293 } else { 5294 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5295 } 5296 5297 refreshDrawableState(); 5298 } 5299 5300 /** 5301 * Returns whether this ViewGroup's drawable states also include 5302 * its children's drawable states. This is used, for example, to 5303 * make a group appear to be focused when its child EditText or button 5304 * is focused. 5305 */ 5306 public boolean addStatesFromChildren() { 5307 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5308 } 5309 5310 /** 5311 * If {@link #addStatesFromChildren} is true, refreshes this group's 5312 * drawable state (to include the states from its children). 5313 */ 5314 public void childDrawableStateChanged(View child) { 5315 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5316 refreshDrawableState(); 5317 } 5318 } 5319 5320 /** 5321 * Specifies the animation listener to which layout animation events must 5322 * be sent. Only 5323 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5324 * and 5325 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5326 * are invoked. 5327 * 5328 * @param animationListener the layout animation listener 5329 */ 5330 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5331 mAnimationListener = animationListener; 5332 } 5333 5334 /** 5335 * This method is called by LayoutTransition when there are 'changing' animations that need 5336 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5337 * starts all pending transitions prior to the drawing phase in the current traversal. 5338 * 5339 * @param transition The LayoutTransition to be started on the next traversal. 5340 * 5341 * @hide 5342 */ 5343 public void requestTransitionStart(LayoutTransition transition) { 5344 ViewRootImpl viewAncestor = getViewRootImpl(); 5345 if (viewAncestor != null) { 5346 viewAncestor.requestTransitionStart(transition); 5347 } 5348 } 5349 5350 /** 5351 * @hide 5352 */ 5353 @Override 5354 public void resolveRtlPropertiesIfNeeded() { 5355 super.resolveRtlPropertiesIfNeeded(); 5356 int count = getChildCount(); 5357 for (int i = 0; i < count; i++) { 5358 final View child = getChildAt(i); 5359 if (child.isLayoutDirectionInherited()) { 5360 child.resolveRtlPropertiesIfNeeded(); 5361 } 5362 } 5363 } 5364 5365 /** 5366 * @hide 5367 */ 5368 @Override 5369 public boolean resolveLayoutDirection() { 5370 final boolean result = super.resolveLayoutDirection(); 5371 if (result) { 5372 int count = getChildCount(); 5373 for (int i = 0; i < count; i++) { 5374 final View child = getChildAt(i); 5375 if (child.isLayoutDirectionInherited()) { 5376 child.resolveLayoutDirection(); 5377 } 5378 } 5379 } 5380 return result; 5381 } 5382 5383 /** 5384 * @hide 5385 */ 5386 @Override 5387 public boolean resolveTextDirection() { 5388 final boolean result = super.resolveTextDirection(); 5389 if (result) { 5390 int count = getChildCount(); 5391 for (int i = 0; i < count; i++) { 5392 final View child = getChildAt(i); 5393 if (child.isTextDirectionInherited()) { 5394 child.resolveTextDirection(); 5395 } 5396 } 5397 } 5398 return result; 5399 } 5400 5401 /** 5402 * @hide 5403 */ 5404 @Override 5405 public boolean resolveTextAlignment() { 5406 final boolean result = super.resolveTextAlignment(); 5407 if (result) { 5408 int count = getChildCount(); 5409 for (int i = 0; i < count; i++) { 5410 final View child = getChildAt(i); 5411 if (child.isTextAlignmentInherited()) { 5412 child.resolveTextAlignment(); 5413 } 5414 } 5415 } 5416 return result; 5417 } 5418 5419 /** 5420 * @hide 5421 */ 5422 @Override 5423 public void resolvePadding() { 5424 super.resolvePadding(); 5425 int count = getChildCount(); 5426 for (int i = 0; i < count; i++) { 5427 final View child = getChildAt(i); 5428 if (child.isLayoutDirectionInherited()) { 5429 child.resolvePadding(); 5430 } 5431 } 5432 } 5433 5434 /** 5435 * @hide 5436 */ 5437 @Override 5438 protected void resolveDrawables() { 5439 super.resolveDrawables(); 5440 int count = getChildCount(); 5441 for (int i = 0; i < count; i++) { 5442 final View child = getChildAt(i); 5443 if (child.isLayoutDirectionInherited()) { 5444 child.resolveDrawables(); 5445 } 5446 } 5447 } 5448 5449 /** 5450 * @hide 5451 */ 5452 @Override 5453 public void resolveLayoutParams() { 5454 super.resolveLayoutParams(); 5455 int count = getChildCount(); 5456 for (int i = 0; i < count; i++) { 5457 final View child = getChildAt(i); 5458 child.resolveLayoutParams(); 5459 } 5460 } 5461 5462 /** 5463 * @hide 5464 */ 5465 @Override 5466 public void resetRtlProperties() { 5467 super.resetRtlProperties(); 5468 int count = getChildCount(); 5469 for (int i = 0; i < count; i++) { 5470 final View child = getChildAt(i); 5471 if (child.isLayoutDirectionInherited()) { 5472 child.resetRtlProperties(); 5473 } 5474 } 5475 } 5476 5477 /** 5478 * @hide 5479 */ 5480 @Override 5481 public void resetResolvedLayoutDirection() { 5482 super.resetResolvedLayoutDirection(); 5483 5484 int count = getChildCount(); 5485 for (int i = 0; i < count; i++) { 5486 final View child = getChildAt(i); 5487 if (child.isLayoutDirectionInherited()) { 5488 child.resetResolvedLayoutDirection(); 5489 } 5490 } 5491 } 5492 5493 /** 5494 * @hide 5495 */ 5496 @Override 5497 public void resetResolvedTextDirection() { 5498 super.resetResolvedTextDirection(); 5499 5500 int count = getChildCount(); 5501 for (int i = 0; i < count; i++) { 5502 final View child = getChildAt(i); 5503 if (child.isTextDirectionInherited()) { 5504 child.resetResolvedTextDirection(); 5505 } 5506 } 5507 } 5508 5509 /** 5510 * @hide 5511 */ 5512 @Override 5513 public void resetResolvedTextAlignment() { 5514 super.resetResolvedTextAlignment(); 5515 5516 int count = getChildCount(); 5517 for (int i = 0; i < count; i++) { 5518 final View child = getChildAt(i); 5519 if (child.isTextAlignmentInherited()) { 5520 child.resetResolvedTextAlignment(); 5521 } 5522 } 5523 } 5524 5525 /** 5526 * @hide 5527 */ 5528 @Override 5529 public void resetResolvedPadding() { 5530 super.resetResolvedPadding(); 5531 5532 int count = getChildCount(); 5533 for (int i = 0; i < count; i++) { 5534 final View child = getChildAt(i); 5535 if (child.isLayoutDirectionInherited()) { 5536 child.resetResolvedPadding(); 5537 } 5538 } 5539 } 5540 5541 /** 5542 * @hide 5543 */ 5544 @Override 5545 protected void resetResolvedDrawables() { 5546 super.resetResolvedDrawables(); 5547 5548 int count = getChildCount(); 5549 for (int i = 0; i < count; i++) { 5550 final View child = getChildAt(i); 5551 if (child.isLayoutDirectionInherited()) { 5552 child.resetResolvedDrawables(); 5553 } 5554 } 5555 } 5556 5557 /** 5558 * Return true if the pressed state should be delayed for children or descendants of this 5559 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5560 * This prevents the pressed state from appearing when the user is actually trying to scroll 5561 * the content. 5562 * 5563 * The default implementation returns true for compatibility reasons. Subclasses that do 5564 * not scroll should generally override this method and return false. 5565 */ 5566 public boolean shouldDelayChildPressedState() { 5567 return true; 5568 } 5569 5570 /** @hide */ 5571 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5572 } 5573 5574 /** 5575 * LayoutParams are used by views to tell their parents how they want to be 5576 * laid out. See 5577 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5578 * for a list of all child view attributes that this class supports. 5579 * 5580 * <p> 5581 * The base LayoutParams class just describes how big the view wants to be 5582 * for both width and height. For each dimension, it can specify one of: 5583 * <ul> 5584 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5585 * means that the view wants to be as big as its parent (minus padding) 5586 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5587 * to enclose its content (plus padding) 5588 * <li> an exact number 5589 * </ul> 5590 * There are subclasses of LayoutParams for different subclasses of 5591 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5592 * LayoutParams which adds an X and Y value.</p> 5593 * 5594 * <div class="special reference"> 5595 * <h3>Developer Guides</h3> 5596 * <p>For more information about creating user interface layouts, read the 5597 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5598 * guide.</p></div> 5599 * 5600 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5601 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5602 */ 5603 public static class LayoutParams { 5604 /** 5605 * Special value for the height or width requested by a View. 5606 * FILL_PARENT means that the view wants to be as big as its parent, 5607 * minus the parent's padding, if any. This value is deprecated 5608 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5609 */ 5610 @SuppressWarnings({"UnusedDeclaration"}) 5611 @Deprecated 5612 public static final int FILL_PARENT = -1; 5613 5614 /** 5615 * Special value for the height or width requested by a View. 5616 * MATCH_PARENT means that the view wants to be as big as its parent, 5617 * minus the parent's padding, if any. Introduced in API Level 8. 5618 */ 5619 public static final int MATCH_PARENT = -1; 5620 5621 /** 5622 * Special value for the height or width requested by a View. 5623 * WRAP_CONTENT means that the view wants to be just large enough to fit 5624 * its own internal content, taking its own padding into account. 5625 */ 5626 public static final int WRAP_CONTENT = -2; 5627 5628 /** 5629 * Information about how wide the view wants to be. Can be one of the 5630 * constants FILL_PARENT (replaced by MATCH_PARENT , 5631 * in API Level 8) or WRAP_CONTENT. or an exact size. 5632 */ 5633 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5634 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5635 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5636 }) 5637 public int width; 5638 5639 /** 5640 * Information about how tall the view wants to be. Can be one of the 5641 * constants FILL_PARENT (replaced by MATCH_PARENT , 5642 * in API Level 8) or WRAP_CONTENT. or an exact size. 5643 */ 5644 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5645 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5646 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5647 }) 5648 public int height; 5649 5650 /** 5651 * Used to animate layouts. 5652 */ 5653 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5654 5655 /** 5656 * Creates a new set of layout parameters. The values are extracted from 5657 * the supplied attributes set and context. The XML attributes mapped 5658 * to this set of layout parameters are: 5659 * 5660 * <ul> 5661 * <li><code>layout_width</code>: the width, either an exact value, 5662 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5663 * {@link #MATCH_PARENT} in API Level 8)</li> 5664 * <li><code>layout_height</code>: the height, either an exact value, 5665 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5666 * {@link #MATCH_PARENT} in API Level 8)</li> 5667 * </ul> 5668 * 5669 * @param c the application environment 5670 * @param attrs the set of attributes from which to extract the layout 5671 * parameters' values 5672 */ 5673 public LayoutParams(Context c, AttributeSet attrs) { 5674 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5675 setBaseAttributes(a, 5676 R.styleable.ViewGroup_Layout_layout_width, 5677 R.styleable.ViewGroup_Layout_layout_height); 5678 a.recycle(); 5679 } 5680 5681 /** 5682 * Creates a new set of layout parameters with the specified width 5683 * and height. 5684 * 5685 * @param width the width, either {@link #WRAP_CONTENT}, 5686 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5687 * API Level 8), or a fixed size in pixels 5688 * @param height the height, either {@link #WRAP_CONTENT}, 5689 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5690 * API Level 8), or a fixed size in pixels 5691 */ 5692 public LayoutParams(int width, int height) { 5693 this.width = width; 5694 this.height = height; 5695 } 5696 5697 /** 5698 * Copy constructor. Clones the width and height values of the source. 5699 * 5700 * @param source The layout params to copy from. 5701 */ 5702 public LayoutParams(LayoutParams source) { 5703 this.width = source.width; 5704 this.height = source.height; 5705 } 5706 5707 /** 5708 * Used internally by MarginLayoutParams. 5709 * @hide 5710 */ 5711 LayoutParams() { 5712 } 5713 5714 /** 5715 * Extracts the layout parameters from the supplied attributes. 5716 * 5717 * @param a the style attributes to extract the parameters from 5718 * @param widthAttr the identifier of the width attribute 5719 * @param heightAttr the identifier of the height attribute 5720 */ 5721 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5722 width = a.getLayoutDimension(widthAttr, "layout_width"); 5723 height = a.getLayoutDimension(heightAttr, "layout_height"); 5724 } 5725 5726 /** 5727 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5728 * layoutDirection changes should override this method. The default implementation does 5729 * nothing. 5730 * 5731 * @param layoutDirection the direction of the layout 5732 * 5733 * {@link View#LAYOUT_DIRECTION_LTR} 5734 * {@link View#LAYOUT_DIRECTION_RTL} 5735 */ 5736 public void resolveLayoutDirection(int layoutDirection) { 5737 } 5738 5739 /** 5740 * Returns a String representation of this set of layout parameters. 5741 * 5742 * @param output the String to prepend to the internal representation 5743 * @return a String with the following format: output + 5744 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5745 * 5746 * @hide 5747 */ 5748 public String debug(String output) { 5749 return output + "ViewGroup.LayoutParams={ width=" 5750 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5751 } 5752 5753 /** 5754 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5755 * 5756 * @param view the view that contains these layout parameters 5757 * @param canvas the canvas on which to draw 5758 * 5759 * @hide 5760 */ 5761 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5762 } 5763 5764 /** 5765 * Converts the specified size to a readable String. 5766 * 5767 * @param size the size to convert 5768 * @return a String instance representing the supplied size 5769 * 5770 * @hide 5771 */ 5772 protected static String sizeToString(int size) { 5773 if (size == WRAP_CONTENT) { 5774 return "wrap-content"; 5775 } 5776 if (size == MATCH_PARENT) { 5777 return "match-parent"; 5778 } 5779 return String.valueOf(size); 5780 } 5781 } 5782 5783 /** 5784 * Per-child layout information for layouts that support margins. 5785 * See 5786 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5787 * for a list of all child view attributes that this class supports. 5788 */ 5789 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5790 /** 5791 * The left margin in pixels of the child. 5792 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5793 * to this field. 5794 */ 5795 @ViewDebug.ExportedProperty(category = "layout") 5796 public int leftMargin; 5797 5798 /** 5799 * The top margin in pixels of the child. 5800 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5801 * to this field. 5802 */ 5803 @ViewDebug.ExportedProperty(category = "layout") 5804 public int topMargin; 5805 5806 /** 5807 * The right margin in pixels of the child. 5808 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5809 * to this field. 5810 */ 5811 @ViewDebug.ExportedProperty(category = "layout") 5812 public int rightMargin; 5813 5814 /** 5815 * The bottom margin in pixels of the child. 5816 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5817 * to this field. 5818 */ 5819 @ViewDebug.ExportedProperty(category = "layout") 5820 public int bottomMargin; 5821 5822 /** 5823 * The start margin in pixels of the child. 5824 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5825 * to this field. 5826 */ 5827 @ViewDebug.ExportedProperty(category = "layout") 5828 private int startMargin = DEFAULT_RELATIVE; 5829 5830 /** 5831 * The end margin in pixels of the child. 5832 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5833 * to this field. 5834 */ 5835 @ViewDebug.ExportedProperty(category = "layout") 5836 private int endMargin = DEFAULT_RELATIVE; 5837 5838 /** 5839 * The default start and end margin. 5840 * @hide 5841 */ 5842 public static final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5843 5844 private int initialLeftMargin; 5845 private int initialRightMargin; 5846 5847 private static int LAYOUT_DIRECTION_UNDEFINED = -1; 5848 5849 // Layout direction undefined by default 5850 private int layoutDirection = LAYOUT_DIRECTION_UNDEFINED; 5851 5852 /** 5853 * Creates a new set of layout parameters. The values are extracted from 5854 * the supplied attributes set and context. 5855 * 5856 * @param c the application environment 5857 * @param attrs the set of attributes from which to extract the layout 5858 * parameters' values 5859 */ 5860 public MarginLayoutParams(Context c, AttributeSet attrs) { 5861 super(); 5862 5863 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5864 setBaseAttributes(a, 5865 R.styleable.ViewGroup_MarginLayout_layout_width, 5866 R.styleable.ViewGroup_MarginLayout_layout_height); 5867 5868 int margin = a.getDimensionPixelSize( 5869 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5870 if (margin >= 0) { 5871 leftMargin = margin; 5872 topMargin = margin; 5873 rightMargin= margin; 5874 bottomMargin = margin; 5875 } else { 5876 leftMargin = a.getDimensionPixelSize( 5877 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5878 topMargin = a.getDimensionPixelSize( 5879 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5880 rightMargin = a.getDimensionPixelSize( 5881 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5882 bottomMargin = a.getDimensionPixelSize( 5883 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5884 startMargin = a.getDimensionPixelSize( 5885 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5886 endMargin = a.getDimensionPixelSize( 5887 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5888 } 5889 5890 initialLeftMargin = leftMargin; 5891 initialRightMargin = rightMargin; 5892 5893 a.recycle(); 5894 } 5895 5896 /** 5897 * {@inheritDoc} 5898 */ 5899 public MarginLayoutParams(int width, int height) { 5900 super(width, height); 5901 } 5902 5903 /** 5904 * Copy constructor. Clones the width, height and margin values of the source. 5905 * 5906 * @param source The layout params to copy from. 5907 */ 5908 public MarginLayoutParams(MarginLayoutParams source) { 5909 this.width = source.width; 5910 this.height = source.height; 5911 5912 this.leftMargin = source.leftMargin; 5913 this.topMargin = source.topMargin; 5914 this.rightMargin = source.rightMargin; 5915 this.bottomMargin = source.bottomMargin; 5916 this.startMargin = source.startMargin; 5917 this.endMargin = source.endMargin; 5918 5919 this.initialLeftMargin = source.leftMargin; 5920 this.initialRightMargin = source.rightMargin; 5921 5922 setLayoutDirection(source.layoutDirection); 5923 } 5924 5925 /** 5926 * {@inheritDoc} 5927 */ 5928 public MarginLayoutParams(LayoutParams source) { 5929 super(source); 5930 } 5931 5932 /** 5933 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5934 * to be done so that the new margins are taken into account. Left and right margins may be 5935 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 5936 * 5937 * @param left the left margin size 5938 * @param top the top margin size 5939 * @param right the right margin size 5940 * @param bottom the bottom margin size 5941 * 5942 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 5943 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5944 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 5945 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5946 */ 5947 public void setMargins(int left, int top, int right, int bottom) { 5948 leftMargin = left; 5949 topMargin = top; 5950 rightMargin = right; 5951 bottomMargin = bottom; 5952 initialLeftMargin = left; 5953 initialRightMargin = right; 5954 } 5955 5956 /** 5957 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 5958 * needs to be done so that the new relative margins are taken into account. Left and right 5959 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 5960 * direction. 5961 * 5962 * @param start the start margin size 5963 * @param top the top margin size 5964 * @param end the right margin size 5965 * @param bottom the bottom margin size 5966 * 5967 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5968 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 5969 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 5970 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 5971 * 5972 * @hide 5973 */ 5974 public void setMarginsRelative(int start, int top, int end, int bottom) { 5975 startMargin = start; 5976 topMargin = top; 5977 endMargin = end; 5978 bottomMargin = bottom; 5979 initialLeftMargin = 0; 5980 initialRightMargin = 0; 5981 } 5982 5983 /** 5984 * Sets the relative start margin. 5985 * 5986 * @param start the start margin size 5987 * 5988 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5989 */ 5990 public void setMarginStart(int start) { 5991 startMargin = start; 5992 } 5993 5994 /** 5995 * Returns the start margin in pixels. 5996 * 5997 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 5998 * 5999 * @return the start margin in pixels. 6000 */ 6001 public int getMarginStart() { 6002 if (startMargin != DEFAULT_RELATIVE) return startMargin; 6003 switch(layoutDirection) { 6004 case View.LAYOUT_DIRECTION_RTL: 6005 return rightMargin; 6006 case View.LAYOUT_DIRECTION_LTR: 6007 default: 6008 return leftMargin; 6009 } 6010 } 6011 6012 /** 6013 * Sets the relative end margin. 6014 * 6015 * @param end the end margin size 6016 * 6017 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6018 */ 6019 public void setMarginEnd(int end) { 6020 endMargin = end; 6021 } 6022 6023 /** 6024 * Returns the end margin in pixels. 6025 * 6026 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6027 * 6028 * @return the end margin in pixels. 6029 */ 6030 public int getMarginEnd() { 6031 if (endMargin != DEFAULT_RELATIVE) return endMargin; 6032 switch(layoutDirection) { 6033 case View.LAYOUT_DIRECTION_RTL: 6034 return leftMargin; 6035 case View.LAYOUT_DIRECTION_LTR: 6036 default: 6037 return rightMargin; 6038 } 6039 } 6040 6041 /** 6042 * Check if margins are relative. 6043 * 6044 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6045 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6046 * 6047 * @return true if either marginStart or marginEnd has been set. 6048 */ 6049 public boolean isMarginRelative() { 6050 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 6051 } 6052 6053 /** 6054 * Set the layout direction 6055 * @param layoutDirection the layout direction. 6056 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6057 * or {@link View#LAYOUT_DIRECTION_RTL}. 6058 */ 6059 public void setLayoutDirection(int layoutDirection) { 6060 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6061 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6062 this.layoutDirection = layoutDirection; 6063 } 6064 6065 /** 6066 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6067 * {@link View#LAYOUT_DIRECTION_RTL}. 6068 * 6069 * @return the layout direction. 6070 */ 6071 public int getLayoutDirection() { 6072 return layoutDirection; 6073 } 6074 6075 /** 6076 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6077 * may be overridden depending on layout direction. 6078 */ 6079 @Override 6080 public void resolveLayoutDirection(int layoutDirection) { 6081 setLayoutDirection(layoutDirection); 6082 6083 if (!isMarginRelative()) return; 6084 6085 switch(layoutDirection) { 6086 case View.LAYOUT_DIRECTION_RTL: 6087 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialLeftMargin; 6088 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialRightMargin; 6089 break; 6090 case View.LAYOUT_DIRECTION_LTR: 6091 default: 6092 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialLeftMargin; 6093 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialRightMargin; 6094 break; 6095 } 6096 } 6097 6098 /** 6099 * @hide 6100 */ 6101 public boolean isLayoutRtl() { 6102 return (layoutDirection == View.LAYOUT_DIRECTION_RTL); 6103 } 6104 6105 /** 6106 * @hide 6107 */ 6108 @Override 6109 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6110 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6111 6112 fillDifference(canvas, 6113 view.getLeft() + oi.left, 6114 view.getTop() + oi.top, 6115 view.getRight() - oi.right, 6116 view.getBottom() - oi.bottom, 6117 leftMargin, 6118 topMargin, 6119 rightMargin, 6120 bottomMargin, 6121 paint); 6122 } 6123 } 6124 6125 /* Describes a touched view and the ids of the pointers that it has captured. 6126 * 6127 * This code assumes that pointer ids are always in the range 0..31 such that 6128 * it can use a bitfield to track which pointer ids are present. 6129 * As it happens, the lower layers of the input dispatch pipeline also use the 6130 * same trick so the assumption should be safe here... 6131 */ 6132 private static final class TouchTarget { 6133 private static final int MAX_RECYCLED = 32; 6134 private static final Object sRecycleLock = new Object(); 6135 private static TouchTarget sRecycleBin; 6136 private static int sRecycledCount; 6137 6138 public static final int ALL_POINTER_IDS = -1; // all ones 6139 6140 // The touched child view. 6141 public View child; 6142 6143 // The combined bit mask of pointer ids for all pointers captured by the target. 6144 public int pointerIdBits; 6145 6146 // The next target in the target list. 6147 public TouchTarget next; 6148 6149 private TouchTarget() { 6150 } 6151 6152 public static TouchTarget obtain(View child, int pointerIdBits) { 6153 final TouchTarget target; 6154 synchronized (sRecycleLock) { 6155 if (sRecycleBin == null) { 6156 target = new TouchTarget(); 6157 } else { 6158 target = sRecycleBin; 6159 sRecycleBin = target.next; 6160 sRecycledCount--; 6161 target.next = null; 6162 } 6163 } 6164 target.child = child; 6165 target.pointerIdBits = pointerIdBits; 6166 return target; 6167 } 6168 6169 public void recycle() { 6170 synchronized (sRecycleLock) { 6171 if (sRecycledCount < MAX_RECYCLED) { 6172 next = sRecycleBin; 6173 sRecycleBin = this; 6174 sRecycledCount += 1; 6175 } else { 6176 next = null; 6177 } 6178 child = null; 6179 } 6180 } 6181 } 6182 6183 /* Describes a hovered view. */ 6184 private static final class HoverTarget { 6185 private static final int MAX_RECYCLED = 32; 6186 private static final Object sRecycleLock = new Object(); 6187 private static HoverTarget sRecycleBin; 6188 private static int sRecycledCount; 6189 6190 // The hovered child view. 6191 public View child; 6192 6193 // The next target in the target list. 6194 public HoverTarget next; 6195 6196 private HoverTarget() { 6197 } 6198 6199 public static HoverTarget obtain(View child) { 6200 final HoverTarget target; 6201 synchronized (sRecycleLock) { 6202 if (sRecycleBin == null) { 6203 target = new HoverTarget(); 6204 } else { 6205 target = sRecycleBin; 6206 sRecycleBin = target.next; 6207 sRecycledCount--; 6208 target.next = null; 6209 } 6210 } 6211 target.child = child; 6212 return target; 6213 } 6214 6215 public void recycle() { 6216 synchronized (sRecycleLock) { 6217 if (sRecycledCount < MAX_RECYCLED) { 6218 next = sRecycleBin; 6219 sRecycleBin = this; 6220 sRecycledCount += 1; 6221 } else { 6222 next = null; 6223 } 6224 child = null; 6225 } 6226 } 6227 } 6228 6229 /** 6230 * Pooled class that orderes the children of a ViewGroup from start 6231 * to end based on how they are laid out and the layout direction. 6232 */ 6233 static class ChildListForAccessibility { 6234 6235 private static final int MAX_POOL_SIZE = 32; 6236 6237 private static final Object sPoolLock = new Object(); 6238 6239 private static ChildListForAccessibility sPool; 6240 6241 private static int sPoolSize; 6242 6243 private boolean mIsPooled; 6244 6245 private ChildListForAccessibility mNext; 6246 6247 private final ArrayList<View> mChildren = new ArrayList<View>(); 6248 6249 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6250 6251 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6252 ChildListForAccessibility list = null; 6253 synchronized (sPoolLock) { 6254 if (sPool != null) { 6255 list = sPool; 6256 sPool = list.mNext; 6257 list.mNext = null; 6258 list.mIsPooled = false; 6259 sPoolSize--; 6260 } else { 6261 list = new ChildListForAccessibility(); 6262 } 6263 list.init(parent, sort); 6264 return list; 6265 } 6266 } 6267 6268 public void recycle() { 6269 if (mIsPooled) { 6270 throw new IllegalStateException("Instance already recycled."); 6271 } 6272 clear(); 6273 synchronized (sPoolLock) { 6274 if (sPoolSize < MAX_POOL_SIZE) { 6275 mNext = sPool; 6276 mIsPooled = true; 6277 sPool = this; 6278 sPoolSize++; 6279 } 6280 } 6281 } 6282 6283 public int getChildCount() { 6284 return mChildren.size(); 6285 } 6286 6287 public View getChildAt(int index) { 6288 return mChildren.get(index); 6289 } 6290 6291 public int getChildIndex(View child) { 6292 return mChildren.indexOf(child); 6293 } 6294 6295 private void init(ViewGroup parent, boolean sort) { 6296 ArrayList<View> children = mChildren; 6297 final int childCount = parent.getChildCount(); 6298 for (int i = 0; i < childCount; i++) { 6299 View child = parent.getChildAt(i); 6300 children.add(child); 6301 } 6302 if (sort) { 6303 ArrayList<ViewLocationHolder> holders = mHolders; 6304 for (int i = 0; i < childCount; i++) { 6305 View child = children.get(i); 6306 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6307 holders.add(holder); 6308 } 6309 Collections.sort(holders); 6310 for (int i = 0; i < childCount; i++) { 6311 ViewLocationHolder holder = holders.get(i); 6312 children.set(i, holder.mView); 6313 holder.recycle(); 6314 } 6315 holders.clear(); 6316 } 6317 } 6318 6319 private void clear() { 6320 mChildren.clear(); 6321 } 6322 } 6323 6324 /** 6325 * Pooled class that holds a View and its location with respect to 6326 * a specified root. This enables sorting of views based on their 6327 * coordinates without recomputing the position relative to the root 6328 * on every comparison. 6329 */ 6330 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6331 6332 private static final int MAX_POOL_SIZE = 32; 6333 6334 private static final Object sPoolLock = new Object(); 6335 6336 private static ViewLocationHolder sPool; 6337 6338 private static int sPoolSize; 6339 6340 private boolean mIsPooled; 6341 6342 private ViewLocationHolder mNext; 6343 6344 private final Rect mLocation = new Rect(); 6345 6346 public View mView; 6347 6348 private int mLayoutDirection; 6349 6350 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6351 ViewLocationHolder holder = null; 6352 synchronized (sPoolLock) { 6353 if (sPool != null) { 6354 holder = sPool; 6355 sPool = holder.mNext; 6356 holder.mNext = null; 6357 holder.mIsPooled = false; 6358 sPoolSize--; 6359 } else { 6360 holder = new ViewLocationHolder(); 6361 } 6362 holder.init(root, view); 6363 return holder; 6364 } 6365 } 6366 6367 public void recycle() { 6368 if (mIsPooled) { 6369 throw new IllegalStateException("Instance already recycled."); 6370 } 6371 clear(); 6372 synchronized (sPoolLock) { 6373 if (sPoolSize < MAX_POOL_SIZE) { 6374 mNext = sPool; 6375 mIsPooled = true; 6376 sPool = this; 6377 sPoolSize++; 6378 } 6379 } 6380 } 6381 6382 @Override 6383 public int compareTo(ViewLocationHolder another) { 6384 // This instance is greater than an invalid argument. 6385 if (another == null) { 6386 return 1; 6387 } 6388 if (getClass() != another.getClass()) { 6389 return 1; 6390 } 6391 // First is above second. 6392 if (mLocation.bottom - another.mLocation.top <= 0) { 6393 return -1; 6394 } 6395 // First is below second. 6396 if (mLocation.top - another.mLocation.bottom >= 0) { 6397 return 1; 6398 } 6399 // LTR 6400 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6401 final int leftDifference = mLocation.left - another.mLocation.left; 6402 // First more to the left than second. 6403 if (leftDifference != 0) { 6404 return leftDifference; 6405 } 6406 } else { // RTL 6407 final int rightDifference = mLocation.right - another.mLocation.right; 6408 // First more to the right than second. 6409 if (rightDifference != 0) { 6410 return -rightDifference; 6411 } 6412 } 6413 // Break tie by top. 6414 final int topDiference = mLocation.top - another.mLocation.top; 6415 if (topDiference != 0) { 6416 return topDiference; 6417 } 6418 // Break tie by height. 6419 final int heightDiference = mLocation.height() - another.mLocation.height(); 6420 if (heightDiference != 0) { 6421 return -heightDiference; 6422 } 6423 // Break tie by width. 6424 final int widthDiference = mLocation.width() - another.mLocation.width(); 6425 if (widthDiference != 0) { 6426 return -widthDiference; 6427 } 6428 // Just break the tie somehow. The accessibliity ids are unique 6429 // and stable, hence this is deterministic tie breaking. 6430 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6431 } 6432 6433 private void init(ViewGroup root, View view) { 6434 Rect viewLocation = mLocation; 6435 view.getDrawingRect(viewLocation); 6436 root.offsetDescendantRectToMyCoords(view, viewLocation); 6437 mView = view; 6438 mLayoutDirection = root.getLayoutDirection(); 6439 } 6440 6441 private void clear() { 6442 mView = null; 6443 mLocation.set(0, 0, 0, 0); 6444 } 6445 } 6446 6447 private static Paint getDebugPaint() { 6448 if (sDebugPaint == null) { 6449 sDebugPaint = new Paint(); 6450 sDebugPaint.setAntiAlias(false); 6451 } 6452 return sDebugPaint; 6453 } 6454 6455 private void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6456 if (sDebugLines== null) { 6457 sDebugLines = new float[16]; 6458 } 6459 6460 sDebugLines[0] = x1; 6461 sDebugLines[1] = y1; 6462 sDebugLines[2] = x2; 6463 sDebugLines[3] = y1; 6464 6465 sDebugLines[4] = x2; 6466 sDebugLines[5] = y1; 6467 sDebugLines[6] = x2; 6468 sDebugLines[7] = y2; 6469 6470 sDebugLines[8] = x2; 6471 sDebugLines[9] = y2; 6472 sDebugLines[10] = x1; 6473 sDebugLines[11] = y2; 6474 6475 sDebugLines[12] = x1; 6476 sDebugLines[13] = y2; 6477 sDebugLines[14] = x1; 6478 sDebugLines[15] = y1; 6479 6480 canvas.drawLines(sDebugLines, paint); 6481 } 6482} 6483