ViewGroup.java revision 684634144b15e4da0ed04baa2c4531ef538652a6
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.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.Pools.SynchronizedPool; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.accessibility.AccessibilityNodeInfo; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import com.android.internal.R; 48import com.android.internal.util.Predicate; 49 50import java.util.ArrayList; 51import java.util.Collections; 52import java.util.HashSet; 53 54import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 55 56/** 57 * <p> 58 * A <code>ViewGroup</code> is a special view that can contain other views 59 * (called children.) The view group is the base class for layouts and views 60 * containers. This class also defines the 61 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 62 * class for layouts parameters. 63 * </p> 64 * 65 * <p> 66 * Also see {@link LayoutParams} for layout attributes. 67 * </p> 68 * 69 * <div class="special reference"> 70 * <h3>Developer Guides</h3> 71 * <p>For more information about creating user interface layouts, read the 72 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 73 * guide.</p></div> 74 * 75 * <p>Here is a complete implementation of a custom ViewGroup that implements 76 * a simple {@link android.widget.FrameLayout} along with the ability to stack 77 * children in left and right gutters.</p> 78 * 79 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 80 * Complete} 81 * 82 * <p>If you are implementing XML layout attributes as shown in the example, this is the 83 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 84 * 85 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 86 * 87 * <p>Finally the layout manager can be used in an XML layout like so:</p> 88 * 89 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 90 * 91 * @attr ref android.R.styleable#ViewGroup_clipChildren 92 * @attr ref android.R.styleable#ViewGroup_clipToPadding 93 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 94 * @attr ref android.R.styleable#ViewGroup_animationCache 95 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 96 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 97 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 98 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 99 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 100 */ 101public abstract class ViewGroup extends View implements ViewParent, ViewManager { 102 private static final String TAG = "ViewGroup"; 103 104 private static final boolean DBG = false; 105 /** @hide */ 106 public static boolean DEBUG_DRAW = false; 107 108 /** 109 * Views which have been hidden or removed which need to be animated on 110 * their way out. 111 * This field should be made private, so it is hidden from the SDK. 112 * {@hide} 113 */ 114 protected ArrayList<View> mDisappearingChildren; 115 116 /** 117 * Listener used to propagate events indicating when children are added 118 * and/or removed from a view group. 119 * This field should be made private, so it is hidden from the SDK. 120 * {@hide} 121 */ 122 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 123 124 // The view contained within this ViewGroup that has or contains focus. 125 private View mFocused; 126 127 /** 128 * A Transformation used when drawing children, to 129 * apply on the child being drawn. 130 */ 131 final Transformation mChildTransformation = new Transformation(); 132 133 /** 134 * Used to track the current invalidation region. 135 */ 136 RectF mInvalidateRegion; 137 138 /** 139 * A Transformation used to calculate a correct 140 * invalidation area when the application is autoscaled. 141 */ 142 Transformation mInvalidationTransformation; 143 144 // View currently under an ongoing drag 145 private View mCurrentDragView; 146 147 // Metadata about the ongoing drag 148 private DragEvent mCurrentDrag; 149 private HashSet<View> mDragNotifiedChildren; 150 151 // Does this group have a child that can accept the current drag payload? 152 private boolean mChildAcceptsDrag; 153 154 // Used during drag dispatch 155 private final PointF mLocalPoint = new PointF(); 156 157 // Layout animation 158 private LayoutAnimationController mLayoutAnimationController; 159 private Animation.AnimationListener mAnimationListener; 160 161 // First touch target in the linked list of touch targets. 162 private TouchTarget mFirstTouchTarget; 163 164 // For debugging only. You can see these in hierarchyviewer. 165 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 166 @ViewDebug.ExportedProperty(category = "events") 167 private long mLastTouchDownTime; 168 @ViewDebug.ExportedProperty(category = "events") 169 private int mLastTouchDownIndex = -1; 170 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 171 @ViewDebug.ExportedProperty(category = "events") 172 private float mLastTouchDownX; 173 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 174 @ViewDebug.ExportedProperty(category = "events") 175 private float mLastTouchDownY; 176 177 // First hover target in the linked list of hover targets. 178 // The hover targets are children which have received ACTION_HOVER_ENTER. 179 // They might not have actually handled the hover event, but we will 180 // continue sending hover events to them as long as the pointer remains over 181 // their bounds and the view group does not intercept hover. 182 private HoverTarget mFirstHoverTarget; 183 184 // True if the view group itself received a hover event. 185 // It might not have actually handled the hover event. 186 private boolean mHoveredSelf; 187 188 /** 189 * Internal flags. 190 * 191 * This field should be made private, so it is hidden from the SDK. 192 * {@hide} 193 */ 194 @ViewDebug.ExportedProperty(flagMapping = { 195 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 196 name = "CLIP_CHILDREN"), 197 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 198 name = "CLIP_TO_PADDING"), 199 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 200 name = "PADDING_NOT_NULL") 201 }) 202 protected int mGroupFlags; 203 204 /** 205 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 206 */ 207 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 208 209 /** 210 * NOTE: If you change the flags below make sure to reflect the changes 211 * the DisplayList class 212 */ 213 214 // When set, ViewGroup invalidates only the child's rectangle 215 // Set by default 216 static final int FLAG_CLIP_CHILDREN = 0x1; 217 218 // When set, ViewGroup excludes the padding area from the invalidate rectangle 219 // Set by default 220 private static final int FLAG_CLIP_TO_PADDING = 0x2; 221 222 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 223 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 224 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 225 226 // When set, dispatchDraw() will run the layout animation and unset the flag 227 private static final int FLAG_RUN_ANIMATION = 0x8; 228 229 // When set, there is either no layout animation on the ViewGroup or the layout 230 // animation is over 231 // Set by default 232 static final int FLAG_ANIMATION_DONE = 0x10; 233 234 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 235 // to clip it, even if FLAG_CLIP_TO_PADDING is set 236 private static final int FLAG_PADDING_NOT_NULL = 0x20; 237 238 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 239 // Set by default 240 private static final int FLAG_ANIMATION_CACHE = 0x40; 241 242 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 243 // layout animation; this avoid clobbering the hierarchy 244 // Automatically set when the layout animation starts, depending on the animation's 245 // characteristics 246 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 247 248 // When set, the next call to drawChild() will clear mChildTransformation's matrix 249 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 250 251 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 252 // the children's Bitmap caches if necessary 253 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 254 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 255 256 /** 257 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 258 * to get the index of the child to draw for that iteration. 259 * 260 * @hide 261 */ 262 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 263 264 /** 265 * When set, this ViewGroup supports static transformations on children; this causes 266 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 267 * invoked when a child is drawn. 268 * 269 * Any subclass overriding 270 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 271 * set this flags in {@link #mGroupFlags}. 272 * 273 * {@hide} 274 */ 275 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 276 277 // When the previous drawChild() invocation used an alpha value that was lower than 278 // 1.0 and set it in mCachePaint 279 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 280 281 /** 282 * When set, this ViewGroup's drawable states also include those 283 * of its children. 284 */ 285 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 286 287 /** 288 * When set, this ViewGroup tries to always draw its children using their drawing cache. 289 */ 290 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 291 292 /** 293 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 294 * draw its children with their drawing cache. 295 */ 296 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 297 298 /** 299 * When set, this group will go through its list of children to notify them of 300 * any drawable state change. 301 */ 302 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 303 304 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 305 306 /** 307 * This view will get focus before any of its descendants. 308 */ 309 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 310 311 /** 312 * This view will get focus only if none of its descendants want it. 313 */ 314 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 315 316 /** 317 * This view will block any of its descendants from getting focus, even 318 * if they are focusable. 319 */ 320 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 321 322 /** 323 * Used to map between enum in attrubutes and flag values. 324 */ 325 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 326 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 327 FOCUS_BLOCK_DESCENDANTS}; 328 329 /** 330 * When set, this ViewGroup should not intercept touch events. 331 * {@hide} 332 */ 333 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 334 335 /** 336 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 337 */ 338 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 339 340 /** 341 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 342 * to children when adding new views. This is used to prevent multiple 343 * onAttached calls when a ViewGroup adds children in its own onAttached method. 344 */ 345 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 346 347 /** 348 * When true, indicates that a layoutMode has been explicitly set, either with 349 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 350 * This distinguishes the situation in which a layout mode was inherited from 351 * one of the ViewGroup's ancestors and cached locally. 352 */ 353 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 354 355 /** 356 * Indicates which types of drawing caches are to be kept in memory. 357 * This field should be made private, so it is hidden from the SDK. 358 * {@hide} 359 */ 360 protected int mPersistentDrawingCache; 361 362 /** 363 * Used to indicate that no drawing cache should be kept in memory. 364 */ 365 public static final int PERSISTENT_NO_CACHE = 0x0; 366 367 /** 368 * Used to indicate that the animation drawing cache should be kept in memory. 369 */ 370 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 371 372 /** 373 * Used to indicate that the scrolling drawing cache should be kept in memory. 374 */ 375 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 376 377 /** 378 * Used to indicate that all drawing caches should be kept in memory. 379 */ 380 public static final int PERSISTENT_ALL_CACHES = 0x3; 381 382 // Layout Modes 383 384 private static final int LAYOUT_MODE_UNDEFINED = -1; 385 386 /** 387 * This constant is a {@link #setLayoutMode(int) layoutMode}. 388 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 389 * {@link #getRight() right} and {@link #getBottom() bottom}. 390 */ 391 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 392 393 /** 394 * This constant is a {@link #setLayoutMode(int) layoutMode}. 395 * Optical bounds describe where a widget appears to be. They sit inside the clip 396 * bounds which need to cover a larger area to allow other effects, 397 * such as shadows and glows, to be drawn. 398 */ 399 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 400 401 /** @hide */ 402 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 403 404 /** 405 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 406 * are set at the same time. 407 */ 408 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 409 410 // Index of the child's left position in the mLocation array 411 private static final int CHILD_LEFT_INDEX = 0; 412 // Index of the child's top position in the mLocation array 413 private static final int CHILD_TOP_INDEX = 1; 414 415 // Child views of this ViewGroup 416 private View[] mChildren; 417 // Number of valid children in the mChildren array, the rest should be null or not 418 // considered as children 419 private int mChildrenCount; 420 421 // Whether layout calls are currently being suppressed, controlled by calls to 422 // suppressLayout() 423 boolean mSuppressLayout = false; 424 425 // Whether any layout calls have actually been suppressed while mSuppressLayout 426 // has been true. This tracks whether we need to issue a requestLayout() when 427 // layout is later re-enabled. 428 private boolean mLayoutCalledWhileSuppressed = false; 429 430 private static final int ARRAY_INITIAL_CAPACITY = 12; 431 private static final int ARRAY_CAPACITY_INCREMENT = 12; 432 433 private static Paint sDebugPaint; 434 private static float[] sDebugLines; 435 436 // Used to draw cached views 437 Paint mCachePaint; 438 439 // Used to animate add/remove changes in layout 440 private LayoutTransition mTransition; 441 442 // The set of views that are currently being transitioned. This list is used to track views 443 // being removed that should not actually be removed from the parent yet because they are 444 // being animated. 445 private ArrayList<View> mTransitioningViews; 446 447 // List of children changing visibility. This is used to potentially keep rendering 448 // views during a transition when they otherwise would have become gone/invisible 449 private ArrayList<View> mVisibilityChangingChildren; 450 451 // Indicates how many of this container's child subtrees contain transient state 452 @ViewDebug.ExportedProperty(category = "layout") 453 private int mChildCountWithTransientState = 0; 454 455 public ViewGroup(Context context) { 456 super(context); 457 initViewGroup(); 458 } 459 460 public ViewGroup(Context context, AttributeSet attrs) { 461 super(context, attrs); 462 initViewGroup(); 463 initFromAttributes(context, attrs); 464 } 465 466 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 467 super(context, attrs, defStyle); 468 initViewGroup(); 469 initFromAttributes(context, attrs); 470 } 471 472 private boolean debugDraw() { 473 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 474 } 475 476 private void initViewGroup() { 477 // ViewGroup doesn't draw by default 478 if (!debugDraw()) { 479 setFlags(WILL_NOT_DRAW, DRAW_MASK); 480 } 481 mGroupFlags |= FLAG_CLIP_CHILDREN; 482 mGroupFlags |= FLAG_CLIP_TO_PADDING; 483 mGroupFlags |= FLAG_ANIMATION_DONE; 484 mGroupFlags |= FLAG_ANIMATION_CACHE; 485 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 486 487 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 488 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 489 } 490 491 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 492 493 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 494 mChildrenCount = 0; 495 496 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 497 } 498 499 private void initFromAttributes(Context context, AttributeSet attrs) { 500 TypedArray a = context.obtainStyledAttributes(attrs, 501 R.styleable.ViewGroup); 502 503 final int N = a.getIndexCount(); 504 for (int i = 0; i < N; i++) { 505 int attr = a.getIndex(i); 506 switch (attr) { 507 case R.styleable.ViewGroup_clipChildren: 508 setClipChildren(a.getBoolean(attr, true)); 509 break; 510 case R.styleable.ViewGroup_clipToPadding: 511 setClipToPadding(a.getBoolean(attr, true)); 512 break; 513 case R.styleable.ViewGroup_animationCache: 514 setAnimationCacheEnabled(a.getBoolean(attr, true)); 515 break; 516 case R.styleable.ViewGroup_persistentDrawingCache: 517 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 518 break; 519 case R.styleable.ViewGroup_addStatesFromChildren: 520 setAddStatesFromChildren(a.getBoolean(attr, false)); 521 break; 522 case R.styleable.ViewGroup_alwaysDrawnWithCache: 523 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 524 break; 525 case R.styleable.ViewGroup_layoutAnimation: 526 int id = a.getResourceId(attr, -1); 527 if (id > 0) { 528 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 529 } 530 break; 531 case R.styleable.ViewGroup_descendantFocusability: 532 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 533 break; 534 case R.styleable.ViewGroup_splitMotionEvents: 535 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 536 break; 537 case R.styleable.ViewGroup_animateLayoutChanges: 538 boolean animateLayoutChanges = a.getBoolean(attr, false); 539 if (animateLayoutChanges) { 540 setLayoutTransition(new LayoutTransition()); 541 } 542 break; 543 case R.styleable.ViewGroup_layoutMode: 544 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 545 break; 546 } 547 } 548 549 a.recycle(); 550 } 551 552 /** 553 * Gets the descendant focusability of this view group. The descendant 554 * focusability defines the relationship between this view group and its 555 * descendants when looking for a view to take focus in 556 * {@link #requestFocus(int, android.graphics.Rect)}. 557 * 558 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 559 * {@link #FOCUS_BLOCK_DESCENDANTS}. 560 */ 561 @ViewDebug.ExportedProperty(category = "focus", mapping = { 562 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 563 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 564 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 565 }) 566 public int getDescendantFocusability() { 567 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 568 } 569 570 /** 571 * Set the descendant focusability of this view group. This defines the relationship 572 * between this view group and its descendants when looking for a view to 573 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 574 * 575 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 576 * {@link #FOCUS_BLOCK_DESCENDANTS}. 577 */ 578 public void setDescendantFocusability(int focusability) { 579 switch (focusability) { 580 case FOCUS_BEFORE_DESCENDANTS: 581 case FOCUS_AFTER_DESCENDANTS: 582 case FOCUS_BLOCK_DESCENDANTS: 583 break; 584 default: 585 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 586 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 587 } 588 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 589 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 590 } 591 592 /** 593 * {@inheritDoc} 594 */ 595 @Override 596 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 597 if (mFocused != null) { 598 mFocused.unFocus(); 599 mFocused = null; 600 } 601 super.handleFocusGainInternal(direction, previouslyFocusedRect); 602 } 603 604 /** 605 * {@inheritDoc} 606 */ 607 public void requestChildFocus(View child, View focused) { 608 if (DBG) { 609 System.out.println(this + " requestChildFocus()"); 610 } 611 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 612 return; 613 } 614 615 // Unfocus us, if necessary 616 super.unFocus(); 617 618 // We had a previous notion of who had focus. Clear it. 619 if (mFocused != child) { 620 if (mFocused != null) { 621 mFocused.unFocus(); 622 } 623 624 mFocused = child; 625 } 626 if (mParent != null) { 627 mParent.requestChildFocus(this, focused); 628 } 629 } 630 631 /** 632 * {@inheritDoc} 633 */ 634 public void focusableViewAvailable(View v) { 635 if (mParent != null 636 // shortcut: don't report a new focusable view if we block our descendants from 637 // getting focus 638 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 639 // shortcut: don't report a new focusable view if we already are focused 640 // (and we don't prefer our descendants) 641 // 642 // note: knowing that mFocused is non-null is not a good enough reason 643 // to break the traversal since in that case we'd actually have to find 644 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 645 // an ancestor of v; this will get checked for at ViewAncestor 646 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 647 mParent.focusableViewAvailable(v); 648 } 649 } 650 651 /** 652 * {@inheritDoc} 653 */ 654 public boolean showContextMenuForChild(View originalView) { 655 return mParent != null && mParent.showContextMenuForChild(originalView); 656 } 657 658 /** 659 * {@inheritDoc} 660 */ 661 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 662 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 663 } 664 665 /** 666 * Find the nearest view in the specified direction that wants to take 667 * focus. 668 * 669 * @param focused The view that currently has focus 670 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 671 * FOCUS_RIGHT, or 0 for not applicable. 672 */ 673 public View focusSearch(View focused, int direction) { 674 if (isRootNamespace()) { 675 // root namespace means we should consider ourselves the top of the 676 // tree for focus searching; otherwise we could be focus searching 677 // into other tabs. see LocalActivityManager and TabHost for more info 678 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 679 } else if (mParent != null) { 680 return mParent.focusSearch(focused, direction); 681 } 682 return null; 683 } 684 685 /** 686 * {@inheritDoc} 687 */ 688 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 689 return false; 690 } 691 692 /** 693 * {@inheritDoc} 694 */ 695 @Override 696 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 697 ViewParent parent = mParent; 698 if (parent == null) { 699 return false; 700 } 701 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 702 if (!propagate) { 703 return false; 704 } 705 return parent.requestSendAccessibilityEvent(this, event); 706 } 707 708 /** 709 * Called when a child has requested sending an {@link AccessibilityEvent} and 710 * gives an opportunity to its parent to augment the event. 711 * <p> 712 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 713 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 714 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 715 * is responsible for handling this call. 716 * </p> 717 * 718 * @param child The child which requests sending the event. 719 * @param event The event to be sent. 720 * @return True if the event should be sent. 721 * 722 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 723 */ 724 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 725 if (mAccessibilityDelegate != null) { 726 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 727 } else { 728 return onRequestSendAccessibilityEventInternal(child, event); 729 } 730 } 731 732 /** 733 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 734 * 735 * Note: Called from the default {@link View.AccessibilityDelegate}. 736 */ 737 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 738 return true; 739 } 740 741 /** 742 * Called when a child view has changed whether or not it is tracking transient state. 743 * 744 * @hide 745 */ 746 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 747 final boolean oldHasTransientState = hasTransientState(); 748 if (childHasTransientState) { 749 mChildCountWithTransientState++; 750 } else { 751 mChildCountWithTransientState--; 752 } 753 754 final boolean newHasTransientState = hasTransientState(); 755 if (mParent != null && oldHasTransientState != newHasTransientState) { 756 try { 757 mParent.childHasTransientStateChanged(this, newHasTransientState); 758 } catch (AbstractMethodError e) { 759 Log.e(TAG, mParent.getClass().getSimpleName() + 760 " does not fully implement ViewParent", e); 761 } 762 } 763 } 764 765 /** 766 * @hide 767 */ 768 @Override 769 public boolean hasTransientState() { 770 return mChildCountWithTransientState > 0 || super.hasTransientState(); 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public boolean dispatchUnhandledMove(View focused, int direction) { 778 return mFocused != null && 779 mFocused.dispatchUnhandledMove(focused, direction); 780 } 781 782 /** 783 * {@inheritDoc} 784 */ 785 public void clearChildFocus(View child) { 786 if (DBG) { 787 System.out.println(this + " clearChildFocus()"); 788 } 789 790 mFocused = null; 791 if (mParent != null) { 792 mParent.clearChildFocus(this); 793 } 794 } 795 796 /** 797 * {@inheritDoc} 798 */ 799 @Override 800 public void clearFocus() { 801 if (DBG) { 802 System.out.println(this + " clearFocus()"); 803 } 804 if (mFocused == null) { 805 super.clearFocus(); 806 } else { 807 View focused = mFocused; 808 mFocused = null; 809 focused.clearFocus(); 810 } 811 } 812 813 /** 814 * {@inheritDoc} 815 */ 816 @Override 817 void unFocus() { 818 if (DBG) { 819 System.out.println(this + " unFocus()"); 820 } 821 if (mFocused == null) { 822 super.unFocus(); 823 } else { 824 mFocused.unFocus(); 825 mFocused = null; 826 } 827 } 828 829 /** 830 * Returns the focused child of this view, if any. The child may have focus 831 * or contain focus. 832 * 833 * @return the focused child or null. 834 */ 835 public View getFocusedChild() { 836 return mFocused; 837 } 838 839 /** 840 * Returns true if this view has or contains focus 841 * 842 * @return true if this view has or contains focus 843 */ 844 @Override 845 public boolean hasFocus() { 846 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 847 } 848 849 /* 850 * (non-Javadoc) 851 * 852 * @see android.view.View#findFocus() 853 */ 854 @Override 855 public View findFocus() { 856 if (DBG) { 857 System.out.println("Find focus in " + this + ": flags=" 858 + isFocused() + ", child=" + mFocused); 859 } 860 861 if (isFocused()) { 862 return this; 863 } 864 865 if (mFocused != null) { 866 return mFocused.findFocus(); 867 } 868 return null; 869 } 870 871 /** 872 * {@inheritDoc} 873 */ 874 @Override 875 public boolean hasFocusable() { 876 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 877 return false; 878 } 879 880 if (isFocusable()) { 881 return true; 882 } 883 884 final int descendantFocusability = getDescendantFocusability(); 885 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 886 final int count = mChildrenCount; 887 final View[] children = mChildren; 888 889 for (int i = 0; i < count; i++) { 890 final View child = children[i]; 891 if (child.hasFocusable()) { 892 return true; 893 } 894 } 895 } 896 897 return false; 898 } 899 900 /** 901 * {@inheritDoc} 902 */ 903 @Override 904 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 905 final int focusableCount = views.size(); 906 907 final int descendantFocusability = getDescendantFocusability(); 908 909 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 910 final int count = mChildrenCount; 911 final View[] children = mChildren; 912 913 for (int i = 0; i < count; i++) { 914 final View child = children[i]; 915 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 916 child.addFocusables(views, direction, focusableMode); 917 } 918 } 919 } 920 921 // we add ourselves (if focusable) in all cases except for when we are 922 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 923 // to avoid the focus search finding layouts when a more precise search 924 // among the focusable children would be more interesting. 925 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 926 // No focusable descendants 927 || (focusableCount == views.size())) { 928 super.addFocusables(views, direction, focusableMode); 929 } 930 } 931 932 @Override 933 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 934 super.findViewsWithText(outViews, text, flags); 935 final int childrenCount = mChildrenCount; 936 final View[] children = mChildren; 937 for (int i = 0; i < childrenCount; i++) { 938 View child = children[i]; 939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 940 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 941 child.findViewsWithText(outViews, text, flags); 942 } 943 } 944 } 945 946 @Override 947 View findViewByAccessibilityIdTraversal(int accessibilityId) { 948 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 949 if (foundView != null) { 950 return foundView; 951 } 952 final int childrenCount = mChildrenCount; 953 final View[] children = mChildren; 954 for (int i = 0; i < childrenCount; i++) { 955 View child = children[i]; 956 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 957 if (foundView != null) { 958 return foundView; 959 } 960 } 961 return null; 962 } 963 964 /** 965 * {@inheritDoc} 966 */ 967 @Override 968 public void dispatchWindowFocusChanged(boolean hasFocus) { 969 super.dispatchWindowFocusChanged(hasFocus); 970 final int count = mChildrenCount; 971 final View[] children = mChildren; 972 for (int i = 0; i < count; i++) { 973 children[i].dispatchWindowFocusChanged(hasFocus); 974 } 975 } 976 977 /** 978 * {@inheritDoc} 979 */ 980 @Override 981 public void addTouchables(ArrayList<View> views) { 982 super.addTouchables(views); 983 984 final int count = mChildrenCount; 985 final View[] children = mChildren; 986 987 for (int i = 0; i < count; i++) { 988 final View child = children[i]; 989 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 990 child.addTouchables(views); 991 } 992 } 993 } 994 995 /** 996 * @hide 997 */ 998 @Override 999 public void makeOptionalFitsSystemWindows() { 1000 super.makeOptionalFitsSystemWindows(); 1001 final int count = mChildrenCount; 1002 final View[] children = mChildren; 1003 for (int i = 0; i < count; i++) { 1004 children[i].makeOptionalFitsSystemWindows(); 1005 } 1006 } 1007 1008 /** 1009 * {@inheritDoc} 1010 */ 1011 @Override 1012 public void dispatchDisplayHint(int hint) { 1013 super.dispatchDisplayHint(hint); 1014 final int count = mChildrenCount; 1015 final View[] children = mChildren; 1016 for (int i = 0; i < count; i++) { 1017 children[i].dispatchDisplayHint(hint); 1018 } 1019 } 1020 1021 /** 1022 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1023 * action. 1024 * 1025 * @param child The view whose visibility has changed 1026 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1027 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1028 * @hide 1029 */ 1030 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1031 if (mTransition != null) { 1032 if (newVisibility == VISIBLE) { 1033 mTransition.showChild(this, child, oldVisibility); 1034 } else { 1035 mTransition.hideChild(this, child, newVisibility); 1036 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1037 // Only track this on disappearing views - appearing views are already visible 1038 // and don't need special handling during drawChild() 1039 if (mVisibilityChangingChildren == null) { 1040 mVisibilityChangingChildren = new ArrayList<View>(); 1041 } 1042 mVisibilityChangingChildren.add(child); 1043 addDisappearingView(child); 1044 } 1045 } 1046 } 1047 1048 // in all cases, for drags 1049 if (mCurrentDrag != null) { 1050 if (newVisibility == VISIBLE) { 1051 notifyChildOfDrag(child); 1052 } 1053 } 1054 } 1055 1056 /** 1057 * {@inheritDoc} 1058 */ 1059 @Override 1060 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1061 super.dispatchVisibilityChanged(changedView, visibility); 1062 final int count = mChildrenCount; 1063 final View[] children = mChildren; 1064 for (int i = 0; i < count; i++) { 1065 children[i].dispatchVisibilityChanged(changedView, visibility); 1066 } 1067 } 1068 1069 /** 1070 * {@inheritDoc} 1071 */ 1072 @Override 1073 public void dispatchWindowVisibilityChanged(int visibility) { 1074 super.dispatchWindowVisibilityChanged(visibility); 1075 final int count = mChildrenCount; 1076 final View[] children = mChildren; 1077 for (int i = 0; i < count; i++) { 1078 children[i].dispatchWindowVisibilityChanged(visibility); 1079 } 1080 } 1081 1082 /** 1083 * {@inheritDoc} 1084 */ 1085 @Override 1086 public void dispatchConfigurationChanged(Configuration newConfig) { 1087 super.dispatchConfigurationChanged(newConfig); 1088 final int count = mChildrenCount; 1089 final View[] children = mChildren; 1090 for (int i = 0; i < count; i++) { 1091 children[i].dispatchConfigurationChanged(newConfig); 1092 } 1093 } 1094 1095 /** 1096 * {@inheritDoc} 1097 */ 1098 public void recomputeViewAttributes(View child) { 1099 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1100 ViewParent parent = mParent; 1101 if (parent != null) parent.recomputeViewAttributes(this); 1102 } 1103 } 1104 1105 @Override 1106 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1107 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1108 super.dispatchCollectViewAttributes(attachInfo, visibility); 1109 final int count = mChildrenCount; 1110 final View[] children = mChildren; 1111 for (int i = 0; i < count; i++) { 1112 final View child = children[i]; 1113 child.dispatchCollectViewAttributes(attachInfo, 1114 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1115 } 1116 } 1117 } 1118 1119 /** 1120 * {@inheritDoc} 1121 */ 1122 public void bringChildToFront(View child) { 1123 int index = indexOfChild(child); 1124 if (index >= 0) { 1125 removeFromArray(index); 1126 addInArray(child, mChildrenCount); 1127 child.mParent = this; 1128 } 1129 } 1130 1131 /** 1132 * {@inheritDoc} 1133 */ 1134 // TODO: Write real docs 1135 @Override 1136 public boolean dispatchDragEvent(DragEvent event) { 1137 boolean retval = false; 1138 final float tx = event.mX; 1139 final float ty = event.mY; 1140 1141 ViewRootImpl root = getViewRootImpl(); 1142 1143 // Dispatch down the view hierarchy 1144 switch (event.mAction) { 1145 case DragEvent.ACTION_DRAG_STARTED: { 1146 // clear state to recalculate which views we drag over 1147 mCurrentDragView = null; 1148 1149 // Set up our tracking of drag-started notifications 1150 mCurrentDrag = DragEvent.obtain(event); 1151 if (mDragNotifiedChildren == null) { 1152 mDragNotifiedChildren = new HashSet<View>(); 1153 } else { 1154 mDragNotifiedChildren.clear(); 1155 } 1156 1157 // Now dispatch down to our children, caching the responses 1158 mChildAcceptsDrag = false; 1159 final int count = mChildrenCount; 1160 final View[] children = mChildren; 1161 for (int i = 0; i < count; i++) { 1162 final View child = children[i]; 1163 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1164 if (child.getVisibility() == VISIBLE) { 1165 final boolean handled = notifyChildOfDrag(children[i]); 1166 if (handled) { 1167 mChildAcceptsDrag = true; 1168 } 1169 } 1170 } 1171 1172 // Return HANDLED if one of our children can accept the drag 1173 if (mChildAcceptsDrag) { 1174 retval = true; 1175 } 1176 } break; 1177 1178 case DragEvent.ACTION_DRAG_ENDED: { 1179 // Release the bookkeeping now that the drag lifecycle has ended 1180 if (mDragNotifiedChildren != null) { 1181 for (View child : mDragNotifiedChildren) { 1182 // If a child was notified about an ongoing drag, it's told that it's over 1183 child.dispatchDragEvent(event); 1184 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1185 child.refreshDrawableState(); 1186 } 1187 1188 mDragNotifiedChildren.clear(); 1189 if (mCurrentDrag != null) { 1190 mCurrentDrag.recycle(); 1191 mCurrentDrag = null; 1192 } 1193 } 1194 1195 // We consider drag-ended to have been handled if one of our children 1196 // had offered to handle the drag. 1197 if (mChildAcceptsDrag) { 1198 retval = true; 1199 } 1200 } break; 1201 1202 case DragEvent.ACTION_DRAG_LOCATION: { 1203 // Find the [possibly new] drag target 1204 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1205 1206 // If we've changed apparent drag target, tell the view root which view 1207 // we're over now [for purposes of the eventual drag-recipient-changed 1208 // notifications to the framework] and tell the new target that the drag 1209 // has entered its bounds. The root will see setDragFocus() calls all 1210 // the way down to the final leaf view that is handling the LOCATION event 1211 // before reporting the new potential recipient to the framework. 1212 if (mCurrentDragView != target) { 1213 root.setDragFocus(target); 1214 1215 final int action = event.mAction; 1216 // If we've dragged off of a child view, send it the EXITED message 1217 if (mCurrentDragView != null) { 1218 final View view = mCurrentDragView; 1219 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1220 view.dispatchDragEvent(event); 1221 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1222 view.refreshDrawableState(); 1223 } 1224 mCurrentDragView = target; 1225 1226 // If we've dragged over a new child view, send it the ENTERED message 1227 if (target != null) { 1228 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1229 target.dispatchDragEvent(event); 1230 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1231 target.refreshDrawableState(); 1232 } 1233 event.mAction = action; // restore the event's original state 1234 } 1235 1236 // Dispatch the actual drag location notice, localized into its coordinates 1237 if (target != null) { 1238 event.mX = mLocalPoint.x; 1239 event.mY = mLocalPoint.y; 1240 1241 retval = target.dispatchDragEvent(event); 1242 1243 event.mX = tx; 1244 event.mY = ty; 1245 } 1246 } break; 1247 1248 /* Entered / exited dispatch 1249 * 1250 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1251 * that we're about to get the corresponding LOCATION event, which we will use to 1252 * determine which of our children is the new target; at that point we will 1253 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1254 * 1255 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1256 * drag has left this ViewGroup, we know by definition that every contained subview 1257 * is also no longer under the drag point. 1258 */ 1259 1260 case DragEvent.ACTION_DRAG_EXITED: { 1261 if (mCurrentDragView != null) { 1262 final View view = mCurrentDragView; 1263 view.dispatchDragEvent(event); 1264 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1265 view.refreshDrawableState(); 1266 1267 mCurrentDragView = null; 1268 } 1269 } break; 1270 1271 case DragEvent.ACTION_DROP: { 1272 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1273 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1274 if (target != null) { 1275 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1276 event.mX = mLocalPoint.x; 1277 event.mY = mLocalPoint.y; 1278 retval = target.dispatchDragEvent(event); 1279 event.mX = tx; 1280 event.mY = ty; 1281 } else { 1282 if (ViewDebug.DEBUG_DRAG) { 1283 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1284 } 1285 } 1286 } break; 1287 } 1288 1289 // If none of our children could handle the event, try here 1290 if (!retval) { 1291 // Call up to the View implementation that dispatches to installed listeners 1292 retval = super.dispatchDragEvent(event); 1293 } 1294 return retval; 1295 } 1296 1297 // Find the frontmost child view that lies under the given point, and calculate 1298 // the position within its own local coordinate system. 1299 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1300 final int count = mChildrenCount; 1301 final View[] children = mChildren; 1302 for (int i = count - 1; i >= 0; i--) { 1303 final View child = children[i]; 1304 if (!child.canAcceptDrag()) { 1305 continue; 1306 } 1307 1308 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1309 return child; 1310 } 1311 } 1312 return null; 1313 } 1314 1315 boolean notifyChildOfDrag(View child) { 1316 if (ViewDebug.DEBUG_DRAG) { 1317 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1318 } 1319 1320 boolean canAccept = false; 1321 if (! mDragNotifiedChildren.contains(child)) { 1322 mDragNotifiedChildren.add(child); 1323 canAccept = child.dispatchDragEvent(mCurrentDrag); 1324 if (canAccept && !child.canAcceptDrag()) { 1325 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1326 child.refreshDrawableState(); 1327 } 1328 } 1329 return canAccept; 1330 } 1331 1332 @Override 1333 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1334 super.dispatchWindowSystemUiVisiblityChanged(visible); 1335 1336 final int count = mChildrenCount; 1337 final View[] children = mChildren; 1338 for (int i=0; i <count; i++) { 1339 final View child = children[i]; 1340 child.dispatchWindowSystemUiVisiblityChanged(visible); 1341 } 1342 } 1343 1344 @Override 1345 public void dispatchSystemUiVisibilityChanged(int visible) { 1346 super.dispatchSystemUiVisibilityChanged(visible); 1347 1348 final int count = mChildrenCount; 1349 final View[] children = mChildren; 1350 for (int i=0; i <count; i++) { 1351 final View child = children[i]; 1352 child.dispatchSystemUiVisibilityChanged(visible); 1353 } 1354 } 1355 1356 @Override 1357 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1358 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1359 1360 final int count = mChildrenCount; 1361 final View[] children = mChildren; 1362 for (int i=0; i <count; i++) { 1363 final View child = children[i]; 1364 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1365 } 1366 return changed; 1367 } 1368 1369 /** 1370 * {@inheritDoc} 1371 */ 1372 @Override 1373 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1374 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1375 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1376 return super.dispatchKeyEventPreIme(event); 1377 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1378 == PFLAG_HAS_BOUNDS) { 1379 return mFocused.dispatchKeyEventPreIme(event); 1380 } 1381 return false; 1382 } 1383 1384 /** 1385 * {@inheritDoc} 1386 */ 1387 @Override 1388 public boolean dispatchKeyEvent(KeyEvent event) { 1389 if (mInputEventConsistencyVerifier != null) { 1390 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1391 } 1392 1393 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1394 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1395 if (super.dispatchKeyEvent(event)) { 1396 return true; 1397 } 1398 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1399 == PFLAG_HAS_BOUNDS) { 1400 if (mFocused.dispatchKeyEvent(event)) { 1401 return true; 1402 } 1403 } 1404 1405 if (mInputEventConsistencyVerifier != null) { 1406 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1407 } 1408 return false; 1409 } 1410 1411 /** 1412 * {@inheritDoc} 1413 */ 1414 @Override 1415 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1416 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1417 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1418 return super.dispatchKeyShortcutEvent(event); 1419 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1420 == PFLAG_HAS_BOUNDS) { 1421 return mFocused.dispatchKeyShortcutEvent(event); 1422 } 1423 return false; 1424 } 1425 1426 /** 1427 * {@inheritDoc} 1428 */ 1429 @Override 1430 public boolean dispatchTrackballEvent(MotionEvent event) { 1431 if (mInputEventConsistencyVerifier != null) { 1432 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1433 } 1434 1435 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1436 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1437 if (super.dispatchTrackballEvent(event)) { 1438 return true; 1439 } 1440 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1441 == PFLAG_HAS_BOUNDS) { 1442 if (mFocused.dispatchTrackballEvent(event)) { 1443 return true; 1444 } 1445 } 1446 1447 if (mInputEventConsistencyVerifier != null) { 1448 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1449 } 1450 return false; 1451 } 1452 1453 /** 1454 * {@inheritDoc} 1455 */ 1456 @SuppressWarnings({"ConstantConditions"}) 1457 @Override 1458 protected boolean dispatchHoverEvent(MotionEvent event) { 1459 final int action = event.getAction(); 1460 1461 // First check whether the view group wants to intercept the hover event. 1462 final boolean interceptHover = onInterceptHoverEvent(event); 1463 event.setAction(action); // restore action in case it was changed 1464 1465 MotionEvent eventNoHistory = event; 1466 boolean handled = false; 1467 1468 // Send events to the hovered children and build a new list of hover targets until 1469 // one is found that handles the event. 1470 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1471 mFirstHoverTarget = null; 1472 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1473 final float x = event.getX(); 1474 final float y = event.getY(); 1475 final int childrenCount = mChildrenCount; 1476 if (childrenCount != 0) { 1477 final boolean customChildOrder = isChildrenDrawingOrderEnabled(); 1478 final View[] children = mChildren; 1479 HoverTarget lastHoverTarget = null; 1480 for (int i = childrenCount - 1; i >= 0; i--) { 1481 final int childIndex = customChildOrder 1482 ? getChildDrawingOrder(childrenCount, i) : i; 1483 final View child = children[childIndex]; 1484 if (!canViewReceivePointerEvents(child) 1485 || !isTransformedTouchPointInView(x, y, child, null)) { 1486 continue; 1487 } 1488 1489 // Obtain a hover target for this child. Dequeue it from the 1490 // old hover target list if the child was previously hovered. 1491 HoverTarget hoverTarget = firstOldHoverTarget; 1492 final boolean wasHovered; 1493 for (HoverTarget predecessor = null; ;) { 1494 if (hoverTarget == null) { 1495 hoverTarget = HoverTarget.obtain(child); 1496 wasHovered = false; 1497 break; 1498 } 1499 1500 if (hoverTarget.child == child) { 1501 if (predecessor != null) { 1502 predecessor.next = hoverTarget.next; 1503 } else { 1504 firstOldHoverTarget = hoverTarget.next; 1505 } 1506 hoverTarget.next = null; 1507 wasHovered = true; 1508 break; 1509 } 1510 1511 predecessor = hoverTarget; 1512 hoverTarget = hoverTarget.next; 1513 } 1514 1515 // Enqueue the hover target onto the new hover target list. 1516 if (lastHoverTarget != null) { 1517 lastHoverTarget.next = hoverTarget; 1518 } else { 1519 lastHoverTarget = hoverTarget; 1520 mFirstHoverTarget = hoverTarget; 1521 } 1522 1523 // Dispatch the event to the child. 1524 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1525 if (!wasHovered) { 1526 // Send the enter as is. 1527 handled |= dispatchTransformedGenericPointerEvent( 1528 event, child); // enter 1529 } 1530 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1531 if (!wasHovered) { 1532 // Synthesize an enter from a move. 1533 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1534 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1535 handled |= dispatchTransformedGenericPointerEvent( 1536 eventNoHistory, child); // enter 1537 eventNoHistory.setAction(action); 1538 1539 handled |= dispatchTransformedGenericPointerEvent( 1540 eventNoHistory, child); // move 1541 } else { 1542 // Send the move as is. 1543 handled |= dispatchTransformedGenericPointerEvent(event, child); 1544 } 1545 } 1546 if (handled) { 1547 break; 1548 } 1549 } 1550 } 1551 } 1552 1553 // Send exit events to all previously hovered children that are no longer hovered. 1554 while (firstOldHoverTarget != null) { 1555 final View child = firstOldHoverTarget.child; 1556 1557 // Exit the old hovered child. 1558 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1559 // Send the exit as is. 1560 handled |= dispatchTransformedGenericPointerEvent( 1561 event, child); // exit 1562 } else { 1563 // Synthesize an exit from a move or enter. 1564 // Ignore the result because hover focus has moved to a different view. 1565 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1566 dispatchTransformedGenericPointerEvent( 1567 event, child); // move 1568 } 1569 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1570 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1571 dispatchTransformedGenericPointerEvent( 1572 eventNoHistory, child); // exit 1573 eventNoHistory.setAction(action); 1574 } 1575 1576 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1577 firstOldHoverTarget.recycle(); 1578 firstOldHoverTarget = nextOldHoverTarget; 1579 } 1580 1581 // Send events to the view group itself if no children have handled it. 1582 boolean newHoveredSelf = !handled; 1583 if (newHoveredSelf == mHoveredSelf) { 1584 if (newHoveredSelf) { 1585 // Send event to the view group as before. 1586 handled |= super.dispatchHoverEvent(event); 1587 } 1588 } else { 1589 if (mHoveredSelf) { 1590 // Exit the view group. 1591 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1592 // Send the exit as is. 1593 handled |= super.dispatchHoverEvent(event); // exit 1594 } else { 1595 // Synthesize an exit from a move or enter. 1596 // Ignore the result because hover focus is moving to a different view. 1597 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1598 super.dispatchHoverEvent(event); // move 1599 } 1600 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1601 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1602 super.dispatchHoverEvent(eventNoHistory); // exit 1603 eventNoHistory.setAction(action); 1604 } 1605 mHoveredSelf = false; 1606 } 1607 1608 if (newHoveredSelf) { 1609 // Enter the view group. 1610 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1611 // Send the enter as is. 1612 handled |= super.dispatchHoverEvent(event); // enter 1613 mHoveredSelf = true; 1614 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1615 // Synthesize an enter from a move. 1616 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1617 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1618 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1619 eventNoHistory.setAction(action); 1620 1621 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1622 mHoveredSelf = true; 1623 } 1624 } 1625 } 1626 1627 // Recycle the copy of the event that we made. 1628 if (eventNoHistory != event) { 1629 eventNoHistory.recycle(); 1630 } 1631 1632 // Done. 1633 return handled; 1634 } 1635 1636 private void exitHoverTargets() { 1637 if (mHoveredSelf || mFirstHoverTarget != null) { 1638 final long now = SystemClock.uptimeMillis(); 1639 MotionEvent event = MotionEvent.obtain(now, now, 1640 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1641 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1642 dispatchHoverEvent(event); 1643 event.recycle(); 1644 } 1645 } 1646 1647 private void cancelHoverTarget(View view) { 1648 HoverTarget predecessor = null; 1649 HoverTarget target = mFirstHoverTarget; 1650 while (target != null) { 1651 final HoverTarget next = target.next; 1652 if (target.child == view) { 1653 if (predecessor == null) { 1654 mFirstHoverTarget = next; 1655 } else { 1656 predecessor.next = next; 1657 } 1658 target.recycle(); 1659 1660 final long now = SystemClock.uptimeMillis(); 1661 MotionEvent event = MotionEvent.obtain(now, now, 1662 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1663 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1664 view.dispatchHoverEvent(event); 1665 event.recycle(); 1666 return; 1667 } 1668 predecessor = target; 1669 target = next; 1670 } 1671 } 1672 1673 /** @hide */ 1674 @Override 1675 protected boolean hasHoveredChild() { 1676 return mFirstHoverTarget != null; 1677 } 1678 1679 @Override 1680 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1681 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1682 try { 1683 final int childrenCount = children.getChildCount(); 1684 for (int i = 0; i < childrenCount; i++) { 1685 View child = children.getChildAt(i); 1686 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1687 if (child.includeForAccessibility()) { 1688 childrenForAccessibility.add(child); 1689 } else { 1690 child.addChildrenForAccessibility(childrenForAccessibility); 1691 } 1692 } 1693 } 1694 } finally { 1695 children.recycle(); 1696 } 1697 } 1698 1699 /** 1700 * @hide 1701 */ 1702 @Override 1703 public void childAccessibilityStateChanged(View child) { 1704 if (mParent != null) { 1705 mParent.childAccessibilityStateChanged(child); 1706 } 1707 } 1708 1709 /** 1710 * Implement this method to intercept hover events before they are handled 1711 * by child views. 1712 * <p> 1713 * This method is called before dispatching a hover event to a child of 1714 * the view group or to the view group's own {@link #onHoverEvent} to allow 1715 * the view group a chance to intercept the hover event. 1716 * This method can also be used to watch all pointer motions that occur within 1717 * the bounds of the view group even when the pointer is hovering over 1718 * a child of the view group rather than over the view group itself. 1719 * </p><p> 1720 * The view group can prevent its children from receiving hover events by 1721 * implementing this method and returning <code>true</code> to indicate 1722 * that it would like to intercept hover events. The view group must 1723 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1724 * for as long as it wishes to continue intercepting hover events from 1725 * its children. 1726 * </p><p> 1727 * Interception preserves the invariant that at most one view can be 1728 * hovered at a time by transferring hover focus from the currently hovered 1729 * child to the view group or vice-versa as needed. 1730 * </p><p> 1731 * If this method returns <code>true</code> and a child is already hovered, then the 1732 * child view will first receive a hover exit event and then the view group 1733 * itself will receive a hover enter event in {@link #onHoverEvent}. 1734 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1735 * events and instead returns <code>false</code> while the pointer is hovering 1736 * within the bounds of one of a child, then the view group will first receive a 1737 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1738 * receive a hover enter event. 1739 * </p><p> 1740 * The default implementation always returns false. 1741 * </p> 1742 * 1743 * @param event The motion event that describes the hover. 1744 * @return True if the view group would like to intercept the hover event 1745 * and prevent its children from receiving it. 1746 */ 1747 public boolean onInterceptHoverEvent(MotionEvent event) { 1748 return false; 1749 } 1750 1751 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1752 if (event.getHistorySize() == 0) { 1753 return event; 1754 } 1755 return MotionEvent.obtainNoHistory(event); 1756 } 1757 1758 /** 1759 * {@inheritDoc} 1760 */ 1761 @Override 1762 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1763 // Send the event to the child under the pointer. 1764 final int childrenCount = mChildrenCount; 1765 if (childrenCount != 0) { 1766 final View[] children = mChildren; 1767 final float x = event.getX(); 1768 final float y = event.getY(); 1769 1770 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1771 for (int i = childrenCount - 1; i >= 0; i--) { 1772 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1773 final View child = children[childIndex]; 1774 if (!canViewReceivePointerEvents(child) 1775 || !isTransformedTouchPointInView(x, y, child, null)) { 1776 continue; 1777 } 1778 1779 if (dispatchTransformedGenericPointerEvent(event, child)) { 1780 return true; 1781 } 1782 } 1783 } 1784 1785 // No child handled the event. Send it to this view group. 1786 return super.dispatchGenericPointerEvent(event); 1787 } 1788 1789 /** 1790 * {@inheritDoc} 1791 */ 1792 @Override 1793 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1794 // Send the event to the focused child or to this view group if it has focus. 1795 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1796 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1797 return super.dispatchGenericFocusedEvent(event); 1798 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1799 == PFLAG_HAS_BOUNDS) { 1800 return mFocused.dispatchGenericMotionEvent(event); 1801 } 1802 return false; 1803 } 1804 1805 /** 1806 * Dispatches a generic pointer event to a child, taking into account 1807 * transformations that apply to the child. 1808 * 1809 * @param event The event to send. 1810 * @param child The view to send the event to. 1811 * @return {@code true} if the child handled the event. 1812 */ 1813 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1814 final float offsetX = mScrollX - child.mLeft; 1815 final float offsetY = mScrollY - child.mTop; 1816 1817 boolean handled; 1818 if (!child.hasIdentityMatrix()) { 1819 MotionEvent transformedEvent = MotionEvent.obtain(event); 1820 transformedEvent.offsetLocation(offsetX, offsetY); 1821 transformedEvent.transform(child.getInverseMatrix()); 1822 handled = child.dispatchGenericMotionEvent(transformedEvent); 1823 transformedEvent.recycle(); 1824 } else { 1825 event.offsetLocation(offsetX, offsetY); 1826 handled = child.dispatchGenericMotionEvent(event); 1827 event.offsetLocation(-offsetX, -offsetY); 1828 } 1829 return handled; 1830 } 1831 1832 /** 1833 * {@inheritDoc} 1834 */ 1835 @Override 1836 public boolean dispatchTouchEvent(MotionEvent ev) { 1837 if (mInputEventConsistencyVerifier != null) { 1838 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1839 } 1840 1841 boolean handled = false; 1842 if (onFilterTouchEventForSecurity(ev)) { 1843 final int action = ev.getAction(); 1844 final int actionMasked = action & MotionEvent.ACTION_MASK; 1845 1846 // Handle an initial down. 1847 if (actionMasked == MotionEvent.ACTION_DOWN) { 1848 // Throw away all previous state when starting a new touch gesture. 1849 // The framework may have dropped the up or cancel event for the previous gesture 1850 // due to an app switch, ANR, or some other state change. 1851 cancelAndClearTouchTargets(ev); 1852 resetTouchState(); 1853 } 1854 1855 // Check for interception. 1856 final boolean intercepted; 1857 if (actionMasked == MotionEvent.ACTION_DOWN 1858 || mFirstTouchTarget != null) { 1859 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1860 if (!disallowIntercept) { 1861 intercepted = onInterceptTouchEvent(ev); 1862 ev.setAction(action); // restore action in case it was changed 1863 } else { 1864 intercepted = false; 1865 } 1866 } else { 1867 // There are no touch targets and this action is not an initial down 1868 // so this view group continues to intercept touches. 1869 intercepted = true; 1870 } 1871 1872 // Check for cancelation. 1873 final boolean canceled = resetCancelNextUpFlag(this) 1874 || actionMasked == MotionEvent.ACTION_CANCEL; 1875 1876 // Update list of touch targets for pointer down, if needed. 1877 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1878 TouchTarget newTouchTarget = null; 1879 boolean alreadyDispatchedToNewTouchTarget = false; 1880 if (!canceled && !intercepted) { 1881 if (actionMasked == MotionEvent.ACTION_DOWN 1882 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1883 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1884 final int actionIndex = ev.getActionIndex(); // always 0 for down 1885 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1886 : TouchTarget.ALL_POINTER_IDS; 1887 1888 // Clean up earlier touch targets for this pointer id in case they 1889 // have become out of sync. 1890 removePointersFromTouchTargets(idBitsToAssign); 1891 1892 final int childrenCount = mChildrenCount; 1893 if (newTouchTarget == null && childrenCount != 0) { 1894 final float x = ev.getX(actionIndex); 1895 final float y = ev.getY(actionIndex); 1896 // Find a child that can receive the event. 1897 // Scan children from front to back. 1898 final View[] children = mChildren; 1899 1900 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1901 for (int i = childrenCount - 1; i >= 0; i--) { 1902 final int childIndex = customOrder ? 1903 getChildDrawingOrder(childrenCount, i) : i; 1904 final View child = children[childIndex]; 1905 if (!canViewReceivePointerEvents(child) 1906 || !isTransformedTouchPointInView(x, y, child, null)) { 1907 continue; 1908 } 1909 1910 newTouchTarget = getTouchTarget(child); 1911 if (newTouchTarget != null) { 1912 // Child is already receiving touch within its bounds. 1913 // Give it the new pointer in addition to the ones it is handling. 1914 newTouchTarget.pointerIdBits |= idBitsToAssign; 1915 break; 1916 } 1917 1918 resetCancelNextUpFlag(child); 1919 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1920 // Child wants to receive touch within its bounds. 1921 mLastTouchDownTime = ev.getDownTime(); 1922 mLastTouchDownIndex = childIndex; 1923 mLastTouchDownX = ev.getX(); 1924 mLastTouchDownY = ev.getY(); 1925 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1926 alreadyDispatchedToNewTouchTarget = true; 1927 break; 1928 } 1929 } 1930 } 1931 1932 if (newTouchTarget == null && mFirstTouchTarget != null) { 1933 // Did not find a child to receive the event. 1934 // Assign the pointer to the least recently added target. 1935 newTouchTarget = mFirstTouchTarget; 1936 while (newTouchTarget.next != null) { 1937 newTouchTarget = newTouchTarget.next; 1938 } 1939 newTouchTarget.pointerIdBits |= idBitsToAssign; 1940 } 1941 } 1942 } 1943 1944 // Dispatch to touch targets. 1945 if (mFirstTouchTarget == null) { 1946 // No touch targets so treat this as an ordinary view. 1947 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1948 TouchTarget.ALL_POINTER_IDS); 1949 } else { 1950 // Dispatch to touch targets, excluding the new touch target if we already 1951 // dispatched to it. Cancel touch targets if necessary. 1952 TouchTarget predecessor = null; 1953 TouchTarget target = mFirstTouchTarget; 1954 while (target != null) { 1955 final TouchTarget next = target.next; 1956 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1957 handled = true; 1958 } else { 1959 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1960 || intercepted; 1961 if (dispatchTransformedTouchEvent(ev, cancelChild, 1962 target.child, target.pointerIdBits)) { 1963 handled = true; 1964 } 1965 if (cancelChild) { 1966 if (predecessor == null) { 1967 mFirstTouchTarget = next; 1968 } else { 1969 predecessor.next = next; 1970 } 1971 target.recycle(); 1972 target = next; 1973 continue; 1974 } 1975 } 1976 predecessor = target; 1977 target = next; 1978 } 1979 } 1980 1981 // Update list of touch targets for pointer up or cancel, if needed. 1982 if (canceled 1983 || actionMasked == MotionEvent.ACTION_UP 1984 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1985 resetTouchState(); 1986 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1987 final int actionIndex = ev.getActionIndex(); 1988 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1989 removePointersFromTouchTargets(idBitsToRemove); 1990 } 1991 } 1992 1993 if (!handled && mInputEventConsistencyVerifier != null) { 1994 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1995 } 1996 return handled; 1997 } 1998 1999 /** 2000 * Resets all touch state in preparation for a new cycle. 2001 */ 2002 private void resetTouchState() { 2003 clearTouchTargets(); 2004 resetCancelNextUpFlag(this); 2005 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2006 } 2007 2008 /** 2009 * Resets the cancel next up flag. 2010 * Returns true if the flag was previously set. 2011 */ 2012 private static boolean resetCancelNextUpFlag(View view) { 2013 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2014 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2015 return true; 2016 } 2017 return false; 2018 } 2019 2020 /** 2021 * Clears all touch targets. 2022 */ 2023 private void clearTouchTargets() { 2024 TouchTarget target = mFirstTouchTarget; 2025 if (target != null) { 2026 do { 2027 TouchTarget next = target.next; 2028 target.recycle(); 2029 target = next; 2030 } while (target != null); 2031 mFirstTouchTarget = null; 2032 } 2033 } 2034 2035 /** 2036 * Cancels and clears all touch targets. 2037 */ 2038 private void cancelAndClearTouchTargets(MotionEvent event) { 2039 if (mFirstTouchTarget != null) { 2040 boolean syntheticEvent = false; 2041 if (event == null) { 2042 final long now = SystemClock.uptimeMillis(); 2043 event = MotionEvent.obtain(now, now, 2044 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2045 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2046 syntheticEvent = true; 2047 } 2048 2049 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2050 resetCancelNextUpFlag(target.child); 2051 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2052 } 2053 clearTouchTargets(); 2054 2055 if (syntheticEvent) { 2056 event.recycle(); 2057 } 2058 } 2059 } 2060 2061 /** 2062 * Gets the touch target for specified child view. 2063 * Returns null if not found. 2064 */ 2065 private TouchTarget getTouchTarget(View child) { 2066 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2067 if (target.child == child) { 2068 return target; 2069 } 2070 } 2071 return null; 2072 } 2073 2074 /** 2075 * Adds a touch target for specified child to the beginning of the list. 2076 * Assumes the target child is not already present. 2077 */ 2078 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2079 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2080 target.next = mFirstTouchTarget; 2081 mFirstTouchTarget = target; 2082 return target; 2083 } 2084 2085 /** 2086 * Removes the pointer ids from consideration. 2087 */ 2088 private void removePointersFromTouchTargets(int pointerIdBits) { 2089 TouchTarget predecessor = null; 2090 TouchTarget target = mFirstTouchTarget; 2091 while (target != null) { 2092 final TouchTarget next = target.next; 2093 if ((target.pointerIdBits & pointerIdBits) != 0) { 2094 target.pointerIdBits &= ~pointerIdBits; 2095 if (target.pointerIdBits == 0) { 2096 if (predecessor == null) { 2097 mFirstTouchTarget = next; 2098 } else { 2099 predecessor.next = next; 2100 } 2101 target.recycle(); 2102 target = next; 2103 continue; 2104 } 2105 } 2106 predecessor = target; 2107 target = next; 2108 } 2109 } 2110 2111 private void cancelTouchTarget(View view) { 2112 TouchTarget predecessor = null; 2113 TouchTarget target = mFirstTouchTarget; 2114 while (target != null) { 2115 final TouchTarget next = target.next; 2116 if (target.child == view) { 2117 if (predecessor == null) { 2118 mFirstTouchTarget = next; 2119 } else { 2120 predecessor.next = next; 2121 } 2122 target.recycle(); 2123 2124 final long now = SystemClock.uptimeMillis(); 2125 MotionEvent event = MotionEvent.obtain(now, now, 2126 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2127 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2128 view.dispatchTouchEvent(event); 2129 event.recycle(); 2130 return; 2131 } 2132 predecessor = target; 2133 target = next; 2134 } 2135 } 2136 2137 /** 2138 * Returns true if a child view can receive pointer events. 2139 * @hide 2140 */ 2141 private static boolean canViewReceivePointerEvents(View child) { 2142 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2143 || child.getAnimation() != null; 2144 } 2145 2146 /** 2147 * Returns true if a child view contains the specified point when transformed 2148 * into its coordinate space. 2149 * Child must not be null. 2150 * @hide 2151 */ 2152 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2153 PointF outLocalPoint) { 2154 float localX = x + mScrollX - child.mLeft; 2155 float localY = y + mScrollY - child.mTop; 2156 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2157 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2158 localXY[0] = localX; 2159 localXY[1] = localY; 2160 child.getInverseMatrix().mapPoints(localXY); 2161 localX = localXY[0]; 2162 localY = localXY[1]; 2163 } 2164 final boolean isInView = child.pointInView(localX, localY); 2165 if (isInView && outLocalPoint != null) { 2166 outLocalPoint.set(localX, localY); 2167 } 2168 return isInView; 2169 } 2170 2171 /** 2172 * Transforms a motion event into the coordinate space of a particular child view, 2173 * filters out irrelevant pointer ids, and overrides its action if necessary. 2174 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2175 */ 2176 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2177 View child, int desiredPointerIdBits) { 2178 final boolean handled; 2179 2180 // Canceling motions is a special case. We don't need to perform any transformations 2181 // or filtering. The important part is the action, not the contents. 2182 final int oldAction = event.getAction(); 2183 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2184 event.setAction(MotionEvent.ACTION_CANCEL); 2185 if (child == null) { 2186 handled = super.dispatchTouchEvent(event); 2187 } else { 2188 handled = child.dispatchTouchEvent(event); 2189 } 2190 event.setAction(oldAction); 2191 return handled; 2192 } 2193 2194 // Calculate the number of pointers to deliver. 2195 final int oldPointerIdBits = event.getPointerIdBits(); 2196 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2197 2198 // If for some reason we ended up in an inconsistent state where it looks like we 2199 // might produce a motion event with no pointers in it, then drop the event. 2200 if (newPointerIdBits == 0) { 2201 return false; 2202 } 2203 2204 // If the number of pointers is the same and we don't need to perform any fancy 2205 // irreversible transformations, then we can reuse the motion event for this 2206 // dispatch as long as we are careful to revert any changes we make. 2207 // Otherwise we need to make a copy. 2208 final MotionEvent transformedEvent; 2209 if (newPointerIdBits == oldPointerIdBits) { 2210 if (child == null || child.hasIdentityMatrix()) { 2211 if (child == null) { 2212 handled = super.dispatchTouchEvent(event); 2213 } else { 2214 final float offsetX = mScrollX - child.mLeft; 2215 final float offsetY = mScrollY - child.mTop; 2216 event.offsetLocation(offsetX, offsetY); 2217 2218 handled = child.dispatchTouchEvent(event); 2219 2220 event.offsetLocation(-offsetX, -offsetY); 2221 } 2222 return handled; 2223 } 2224 transformedEvent = MotionEvent.obtain(event); 2225 } else { 2226 transformedEvent = event.split(newPointerIdBits); 2227 } 2228 2229 // Perform any necessary transformations and dispatch. 2230 if (child == null) { 2231 handled = super.dispatchTouchEvent(transformedEvent); 2232 } else { 2233 final float offsetX = mScrollX - child.mLeft; 2234 final float offsetY = mScrollY - child.mTop; 2235 transformedEvent.offsetLocation(offsetX, offsetY); 2236 if (! child.hasIdentityMatrix()) { 2237 transformedEvent.transform(child.getInverseMatrix()); 2238 } 2239 2240 handled = child.dispatchTouchEvent(transformedEvent); 2241 } 2242 2243 // Done. 2244 transformedEvent.recycle(); 2245 return handled; 2246 } 2247 2248 /** 2249 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2250 * dispatch. This behavior is enabled by default for applications that target an 2251 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2252 * 2253 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2254 * views depending on where each pointer initially went down. This allows for user interactions 2255 * such as scrolling two panes of content independently, chording of buttons, and performing 2256 * independent gestures on different pieces of content. 2257 * 2258 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2259 * child views. <code>false</code> to only allow one child view to be the target of 2260 * any MotionEvent received by this ViewGroup. 2261 */ 2262 public void setMotionEventSplittingEnabled(boolean split) { 2263 // TODO Applications really shouldn't change this setting mid-touch event, 2264 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2265 // with gestures in progress when this is changed. 2266 if (split) { 2267 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2268 } else { 2269 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2270 } 2271 } 2272 2273 /** 2274 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2275 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2276 */ 2277 public boolean isMotionEventSplittingEnabled() { 2278 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2279 } 2280 2281 /** 2282 * {@inheritDoc} 2283 */ 2284 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2285 2286 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2287 // We're already in this state, assume our ancestors are too 2288 return; 2289 } 2290 2291 if (disallowIntercept) { 2292 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2293 } else { 2294 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2295 } 2296 2297 // Pass it up to our parent 2298 if (mParent != null) { 2299 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2300 } 2301 } 2302 2303 /** 2304 * Implement this method to intercept all touch screen motion events. This 2305 * allows you to watch events as they are dispatched to your children, and 2306 * take ownership of the current gesture at any point. 2307 * 2308 * <p>Using this function takes some care, as it has a fairly complicated 2309 * interaction with {@link View#onTouchEvent(MotionEvent) 2310 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2311 * that method as well as this one in the correct way. Events will be 2312 * received in the following order: 2313 * 2314 * <ol> 2315 * <li> You will receive the down event here. 2316 * <li> The down event will be handled either by a child of this view 2317 * group, or given to your own onTouchEvent() method to handle; this means 2318 * you should implement onTouchEvent() to return true, so you will 2319 * continue to see the rest of the gesture (instead of looking for 2320 * a parent view to handle it). Also, by returning true from 2321 * onTouchEvent(), you will not receive any following 2322 * events in onInterceptTouchEvent() and all touch processing must 2323 * happen in onTouchEvent() like normal. 2324 * <li> For as long as you return false from this function, each following 2325 * event (up to and including the final up) will be delivered first here 2326 * and then to the target's onTouchEvent(). 2327 * <li> If you return true from here, you will not receive any 2328 * following events: the target view will receive the same event but 2329 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2330 * events will be delivered to your onTouchEvent() method and no longer 2331 * appear here. 2332 * </ol> 2333 * 2334 * @param ev The motion event being dispatched down the hierarchy. 2335 * @return Return true to steal motion events from the children and have 2336 * them dispatched to this ViewGroup through onTouchEvent(). 2337 * The current target will receive an ACTION_CANCEL event, and no further 2338 * messages will be delivered here. 2339 */ 2340 public boolean onInterceptTouchEvent(MotionEvent ev) { 2341 return false; 2342 } 2343 2344 /** 2345 * {@inheritDoc} 2346 * 2347 * Looks for a view to give focus to respecting the setting specified by 2348 * {@link #getDescendantFocusability()}. 2349 * 2350 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2351 * find focus within the children of this group when appropriate. 2352 * 2353 * @see #FOCUS_BEFORE_DESCENDANTS 2354 * @see #FOCUS_AFTER_DESCENDANTS 2355 * @see #FOCUS_BLOCK_DESCENDANTS 2356 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2357 */ 2358 @Override 2359 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2360 if (DBG) { 2361 System.out.println(this + " ViewGroup.requestFocus direction=" 2362 + direction); 2363 } 2364 int descendantFocusability = getDescendantFocusability(); 2365 2366 switch (descendantFocusability) { 2367 case FOCUS_BLOCK_DESCENDANTS: 2368 return super.requestFocus(direction, previouslyFocusedRect); 2369 case FOCUS_BEFORE_DESCENDANTS: { 2370 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2371 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2372 } 2373 case FOCUS_AFTER_DESCENDANTS: { 2374 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2375 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2376 } 2377 default: 2378 throw new IllegalStateException("descendant focusability must be " 2379 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2380 + "but is " + descendantFocusability); 2381 } 2382 } 2383 2384 /** 2385 * Look for a descendant to call {@link View#requestFocus} on. 2386 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2387 * when it wants to request focus within its children. Override this to 2388 * customize how your {@link ViewGroup} requests focus within its children. 2389 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2390 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2391 * to give a finer grained hint about where focus is coming from. May be null 2392 * if there is no hint. 2393 * @return Whether focus was taken. 2394 */ 2395 @SuppressWarnings({"ConstantConditions"}) 2396 protected boolean onRequestFocusInDescendants(int direction, 2397 Rect previouslyFocusedRect) { 2398 int index; 2399 int increment; 2400 int end; 2401 int count = mChildrenCount; 2402 if ((direction & FOCUS_FORWARD) != 0) { 2403 index = 0; 2404 increment = 1; 2405 end = count; 2406 } else { 2407 index = count - 1; 2408 increment = -1; 2409 end = -1; 2410 } 2411 final View[] children = mChildren; 2412 for (int i = index; i != end; i += increment) { 2413 View child = children[i]; 2414 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2415 if (child.requestFocus(direction, previouslyFocusedRect)) { 2416 return true; 2417 } 2418 } 2419 } 2420 return false; 2421 } 2422 2423 /** 2424 * {@inheritDoc} 2425 * 2426 * @hide 2427 */ 2428 @Override 2429 public void dispatchStartTemporaryDetach() { 2430 super.dispatchStartTemporaryDetach(); 2431 final int count = mChildrenCount; 2432 final View[] children = mChildren; 2433 for (int i = 0; i < count; i++) { 2434 children[i].dispatchStartTemporaryDetach(); 2435 } 2436 } 2437 2438 /** 2439 * {@inheritDoc} 2440 * 2441 * @hide 2442 */ 2443 @Override 2444 public void dispatchFinishTemporaryDetach() { 2445 super.dispatchFinishTemporaryDetach(); 2446 final int count = mChildrenCount; 2447 final View[] children = mChildren; 2448 for (int i = 0; i < count; i++) { 2449 children[i].dispatchFinishTemporaryDetach(); 2450 } 2451 } 2452 2453 /** 2454 * {@inheritDoc} 2455 */ 2456 @Override 2457 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2458 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2459 super.dispatchAttachedToWindow(info, visibility); 2460 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2461 2462 final int count = mChildrenCount; 2463 final View[] children = mChildren; 2464 for (int i = 0; i < count; i++) { 2465 final View child = children[i]; 2466 child.dispatchAttachedToWindow(info, 2467 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2468 } 2469 } 2470 2471 @Override 2472 void dispatchScreenStateChanged(int screenState) { 2473 super.dispatchScreenStateChanged(screenState); 2474 2475 final int count = mChildrenCount; 2476 final View[] children = mChildren; 2477 for (int i = 0; i < count; i++) { 2478 children[i].dispatchScreenStateChanged(screenState); 2479 } 2480 } 2481 2482 @Override 2483 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2484 boolean handled = false; 2485 if (includeForAccessibility()) { 2486 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2487 if (handled) { 2488 return handled; 2489 } 2490 } 2491 // Let our children have a shot in populating the event. 2492 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2493 try { 2494 final int childCount = children.getChildCount(); 2495 for (int i = 0; i < childCount; i++) { 2496 View child = children.getChildAt(i); 2497 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2498 handled = child.dispatchPopulateAccessibilityEvent(event); 2499 if (handled) { 2500 return handled; 2501 } 2502 } 2503 } 2504 } finally { 2505 children.recycle(); 2506 } 2507 return false; 2508 } 2509 2510 @Override 2511 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2512 super.onInitializeAccessibilityNodeInfoInternal(info); 2513 if (mAttachInfo != null) { 2514 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2515 childrenForAccessibility.clear(); 2516 addChildrenForAccessibility(childrenForAccessibility); 2517 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2518 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2519 View child = childrenForAccessibility.get(i); 2520 info.addChild(child); 2521 } 2522 childrenForAccessibility.clear(); 2523 } 2524 } 2525 2526 @Override 2527 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2528 super.onInitializeAccessibilityEventInternal(event); 2529 event.setClassName(ViewGroup.class.getName()); 2530 } 2531 2532 /** 2533 * @hide 2534 */ 2535 @Override 2536 public void resetAccessibilityStateChanged() { 2537 super.resetAccessibilityStateChanged(); 2538 View[] children = mChildren; 2539 final int childCount = mChildrenCount; 2540 for (int i = 0; i < childCount; i++) { 2541 View child = children[i]; 2542 child.resetAccessibilityStateChanged(); 2543 } 2544 } 2545 2546 /** 2547 * {@inheritDoc} 2548 */ 2549 @Override 2550 void dispatchDetachedFromWindow() { 2551 // If we still have a touch target, we are still in the process of 2552 // dispatching motion events to a child; we need to get rid of that 2553 // child to avoid dispatching events to it after the window is torn 2554 // down. To make sure we keep the child in a consistent state, we 2555 // first send it an ACTION_CANCEL motion event. 2556 cancelAndClearTouchTargets(null); 2557 2558 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2559 exitHoverTargets(); 2560 2561 // In case view is detached while transition is running 2562 mLayoutCalledWhileSuppressed = false; 2563 2564 // Tear down our drag tracking 2565 mDragNotifiedChildren = null; 2566 if (mCurrentDrag != null) { 2567 mCurrentDrag.recycle(); 2568 mCurrentDrag = null; 2569 } 2570 2571 final int count = mChildrenCount; 2572 final View[] children = mChildren; 2573 for (int i = 0; i < count; i++) { 2574 children[i].dispatchDetachedFromWindow(); 2575 } 2576 super.dispatchDetachedFromWindow(); 2577 } 2578 2579 /** 2580 * @hide 2581 */ 2582 @Override 2583 protected void internalSetPadding(int left, int top, int right, int bottom) { 2584 super.internalSetPadding(left, top, right, bottom); 2585 2586 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2587 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2588 } else { 2589 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2590 } 2591 } 2592 2593 /** 2594 * {@inheritDoc} 2595 */ 2596 @Override 2597 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2598 super.dispatchSaveInstanceState(container); 2599 final int count = mChildrenCount; 2600 final View[] children = mChildren; 2601 for (int i = 0; i < count; i++) { 2602 View c = children[i]; 2603 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2604 c.dispatchSaveInstanceState(container); 2605 } 2606 } 2607 } 2608 2609 /** 2610 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2611 * to only this view, not to its children. For use when overriding 2612 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2613 * subclasses to freeze their own state but not the state of their children. 2614 * 2615 * @param container the container 2616 */ 2617 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2618 super.dispatchSaveInstanceState(container); 2619 } 2620 2621 /** 2622 * {@inheritDoc} 2623 */ 2624 @Override 2625 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2626 super.dispatchRestoreInstanceState(container); 2627 final int count = mChildrenCount; 2628 final View[] children = mChildren; 2629 for (int i = 0; i < count; i++) { 2630 View c = children[i]; 2631 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2632 c.dispatchRestoreInstanceState(container); 2633 } 2634 } 2635 } 2636 2637 /** 2638 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2639 * to only this view, not to its children. For use when overriding 2640 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2641 * subclasses to thaw their own state but not the state of their children. 2642 * 2643 * @param container the container 2644 */ 2645 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2646 super.dispatchRestoreInstanceState(container); 2647 } 2648 2649 /** 2650 * Enables or disables the drawing cache for each child of this view group. 2651 * 2652 * @param enabled true to enable the cache, false to dispose of it 2653 */ 2654 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2655 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2656 final View[] children = mChildren; 2657 final int count = mChildrenCount; 2658 for (int i = 0; i < count; i++) { 2659 children[i].setDrawingCacheEnabled(enabled); 2660 } 2661 } 2662 } 2663 2664 @Override 2665 protected void onAnimationStart() { 2666 super.onAnimationStart(); 2667 2668 // When this ViewGroup's animation starts, build the cache for the children 2669 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2670 final int count = mChildrenCount; 2671 final View[] children = mChildren; 2672 final boolean buildCache = !isHardwareAccelerated(); 2673 2674 for (int i = 0; i < count; i++) { 2675 final View child = children[i]; 2676 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2677 child.setDrawingCacheEnabled(true); 2678 if (buildCache) { 2679 child.buildDrawingCache(true); 2680 } 2681 } 2682 } 2683 2684 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2685 } 2686 } 2687 2688 @Override 2689 protected void onAnimationEnd() { 2690 super.onAnimationEnd(); 2691 2692 // When this ViewGroup's animation ends, destroy the cache of the children 2693 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2694 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2695 2696 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2697 setChildrenDrawingCacheEnabled(false); 2698 } 2699 } 2700 } 2701 2702 @Override 2703 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2704 int count = mChildrenCount; 2705 int[] visibilities = null; 2706 2707 if (skipChildren) { 2708 visibilities = new int[count]; 2709 for (int i = 0; i < count; i++) { 2710 View child = getChildAt(i); 2711 visibilities[i] = child.getVisibility(); 2712 if (visibilities[i] == View.VISIBLE) { 2713 child.setVisibility(INVISIBLE); 2714 } 2715 } 2716 } 2717 2718 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2719 2720 if (skipChildren) { 2721 for (int i = 0; i < count; i++) { 2722 getChildAt(i).setVisibility(visibilities[i]); 2723 } 2724 } 2725 2726 return b; 2727 } 2728 2729 /** Return true if this ViewGroup is laying out using optical bounds. */ 2730 boolean isLayoutModeOptical() { 2731 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2732 } 2733 2734 Insets computeOpticalInsets() { 2735 if (isLayoutModeOptical()) { 2736 int left = 0; 2737 int top = 0; 2738 int right = 0; 2739 int bottom = 0; 2740 for (int i = 0; i < mChildrenCount; i++) { 2741 View child = getChildAt(i); 2742 if (child.getVisibility() == VISIBLE) { 2743 Insets insets = child.getOpticalInsets(); 2744 left = Math.max(left, insets.left); 2745 top = Math.max(top, insets.top); 2746 right = Math.max(right, insets.right); 2747 bottom = Math.max(bottom, insets.bottom); 2748 } 2749 } 2750 return Insets.of(left, top, right, bottom); 2751 } else { 2752 return Insets.NONE; 2753 } 2754 } 2755 2756 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2757 if (x1 != x2 && y1 != y2) { 2758 if (x1 > x2) { 2759 int tmp = x1; x1 = x2; x2 = tmp; 2760 } 2761 if (y1 > y2) { 2762 int tmp = y1; y1 = y2; y2 = tmp; 2763 } 2764 canvas.drawRect(x1, y1, x2, y2, paint); 2765 } 2766 } 2767 2768 private static int sign(int x) { 2769 return (x >= 0) ? 1 : -1; 2770 } 2771 2772 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2773 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2774 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2775 } 2776 2777 private int dipsToPixels(int dips) { 2778 float scale = getContext().getResources().getDisplayMetrics().density; 2779 return (int) (dips * scale + 0.5f); 2780 } 2781 2782 private void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2783 int lineLength, int lineWidth) { 2784 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2785 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2786 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2787 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2788 } 2789 2790 private static void fillDifference(Canvas canvas, 2791 int x2, int y2, int x3, int y3, 2792 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2793 int x1 = x2 - dx1; 2794 int y1 = y2 - dy1; 2795 2796 int x4 = x3 + dx2; 2797 int y4 = y3 + dy2; 2798 2799 fillRect(canvas, paint, x1, y1, x4, y2); 2800 fillRect(canvas, paint, x1, y2, x2, y3); 2801 fillRect(canvas, paint, x3, y2, x4, y3); 2802 fillRect(canvas, paint, x1, y3, x4, y4); 2803 } 2804 2805 /** 2806 * @hide 2807 */ 2808 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2809 for (int i = 0; i < getChildCount(); i++) { 2810 View c = getChildAt(i); 2811 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2812 } 2813 } 2814 2815 /** 2816 * @hide 2817 */ 2818 protected void onDebugDraw(Canvas canvas) { 2819 Paint paint = getDebugPaint(); 2820 2821 // Draw optical bounds 2822 { 2823 paint.setColor(Color.RED); 2824 paint.setStyle(Paint.Style.STROKE); 2825 2826 for (int i = 0; i < getChildCount(); i++) { 2827 View c = getChildAt(i); 2828 Insets insets = c.getOpticalInsets(); 2829 2830 drawRect(canvas, paint, 2831 c.getLeft() + insets.left, 2832 c.getTop() + insets.top, 2833 c.getRight() - insets.right - 1, 2834 c.getBottom() - insets.bottom - 1); 2835 } 2836 } 2837 2838 // Draw margins 2839 { 2840 paint.setColor(Color.argb(63, 255, 0, 255)); 2841 paint.setStyle(Paint.Style.FILL); 2842 2843 onDebugDrawMargins(canvas, paint); 2844 } 2845 2846 // Draw clip bounds 2847 { 2848 paint.setColor(Color.rgb(63, 127, 255)); 2849 paint.setStyle(Paint.Style.FILL); 2850 2851 int lineLength = dipsToPixels(8); 2852 int lineWidth = dipsToPixels(1); 2853 for (int i = 0; i < getChildCount(); i++) { 2854 View c = getChildAt(i); 2855 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2856 paint, lineLength, lineWidth); 2857 } 2858 } 2859 } 2860 2861 /** 2862 * {@inheritDoc} 2863 */ 2864 @Override 2865 protected void dispatchDraw(Canvas canvas) { 2866 final int count = mChildrenCount; 2867 final View[] children = mChildren; 2868 int flags = mGroupFlags; 2869 2870 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2871 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2872 2873 final boolean buildCache = !isHardwareAccelerated(); 2874 for (int i = 0; i < count; i++) { 2875 final View child = children[i]; 2876 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2877 final LayoutParams params = child.getLayoutParams(); 2878 attachLayoutAnimationParameters(child, params, i, count); 2879 bindLayoutAnimation(child); 2880 if (cache) { 2881 child.setDrawingCacheEnabled(true); 2882 if (buildCache) { 2883 child.buildDrawingCache(true); 2884 } 2885 } 2886 } 2887 } 2888 2889 final LayoutAnimationController controller = mLayoutAnimationController; 2890 if (controller.willOverlap()) { 2891 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2892 } 2893 2894 controller.start(); 2895 2896 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2897 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2898 2899 if (cache) { 2900 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2901 } 2902 2903 if (mAnimationListener != null) { 2904 mAnimationListener.onAnimationStart(controller.getAnimation()); 2905 } 2906 } 2907 2908 int saveCount = 0; 2909 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2910 if (clipToPadding) { 2911 saveCount = canvas.save(); 2912 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2913 mScrollX + mRight - mLeft - mPaddingRight, 2914 mScrollY + mBottom - mTop - mPaddingBottom); 2915 2916 } 2917 2918 // We will draw our child's animation, let's reset the flag 2919 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2920 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2921 2922 boolean more = false; 2923 final long drawingTime = getDrawingTime(); 2924 2925 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2926 for (int i = 0; i < count; i++) { 2927 final View child = children[i]; 2928 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2929 more |= drawChild(canvas, child, drawingTime); 2930 } 2931 } 2932 } else { 2933 for (int i = 0; i < count; i++) { 2934 final View child = children[getChildDrawingOrder(count, i)]; 2935 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2936 more |= drawChild(canvas, child, drawingTime); 2937 } 2938 } 2939 } 2940 2941 // Draw any disappearing views that have animations 2942 if (mDisappearingChildren != null) { 2943 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2944 final int disappearingCount = disappearingChildren.size() - 1; 2945 // Go backwards -- we may delete as animations finish 2946 for (int i = disappearingCount; i >= 0; i--) { 2947 final View child = disappearingChildren.get(i); 2948 more |= drawChild(canvas, child, drawingTime); 2949 } 2950 } 2951 2952 if (debugDraw()) { 2953 onDebugDraw(canvas); 2954 } 2955 2956 if (clipToPadding) { 2957 canvas.restoreToCount(saveCount); 2958 } 2959 2960 // mGroupFlags might have been updated by drawChild() 2961 flags = mGroupFlags; 2962 2963 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2964 invalidate(true); 2965 } 2966 2967 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2968 mLayoutAnimationController.isDone() && !more) { 2969 // We want to erase the drawing cache and notify the listener after the 2970 // next frame is drawn because one extra invalidate() is caused by 2971 // drawChild() after the animation is over 2972 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2973 final Runnable end = new Runnable() { 2974 public void run() { 2975 notifyAnimationListener(); 2976 } 2977 }; 2978 post(end); 2979 } 2980 } 2981 2982 /** 2983 * Returns the ViewGroupOverlay for this view group, creating it if it does 2984 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 2985 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 2986 * views, like overlay drawables, are visual-only; they do not receive input 2987 * events and should not be used as anything other than a temporary 2988 * representation of a view in a parent container, such as might be used 2989 * by an animation effect. 2990 * 2991 * <p>Note: Overlays do not currently work correctly with {@link 2992 * SurfaceView} or {@link TextureView}; contents in overlays for these 2993 * types of views may not display correctly.</p> 2994 * 2995 * @return The ViewGroupOverlay object for this view. 2996 * @see ViewGroupOverlay 2997 */ 2998 @Override 2999 public ViewGroupOverlay getOverlay() { 3000 if (mOverlay == null) { 3001 mOverlay = new ViewGroupOverlay(mContext, this); 3002 } 3003 return (ViewGroupOverlay) mOverlay; 3004 } 3005 3006 /** 3007 * Returns the index of the child to draw for this iteration. Override this 3008 * if you want to change the drawing order of children. By default, it 3009 * returns i. 3010 * <p> 3011 * NOTE: In order for this method to be called, you must enable child ordering 3012 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3013 * 3014 * @param i The current iteration. 3015 * @return The index of the child to draw this iteration. 3016 * 3017 * @see #setChildrenDrawingOrderEnabled(boolean) 3018 * @see #isChildrenDrawingOrderEnabled() 3019 */ 3020 protected int getChildDrawingOrder(int childCount, int i) { 3021 return i; 3022 } 3023 3024 private void notifyAnimationListener() { 3025 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3026 mGroupFlags |= FLAG_ANIMATION_DONE; 3027 3028 if (mAnimationListener != null) { 3029 final Runnable end = new Runnable() { 3030 public void run() { 3031 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3032 } 3033 }; 3034 post(end); 3035 } 3036 3037 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3038 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3039 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3040 setChildrenDrawingCacheEnabled(false); 3041 } 3042 } 3043 3044 invalidate(true); 3045 } 3046 3047 /** 3048 * This method is used to cause children of this ViewGroup to restore or recreate their 3049 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3050 * to recreate its own display list, which would happen if it went through the normal 3051 * draw/dispatchDraw mechanisms. 3052 * 3053 * @hide 3054 */ 3055 @Override 3056 protected void dispatchGetDisplayList() { 3057 final int count = mChildrenCount; 3058 final View[] children = mChildren; 3059 for (int i = 0; i < count; i++) { 3060 final View child = children[i]; 3061 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3062 child.hasStaticLayer()) { 3063 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3064 == PFLAG_INVALIDATED; 3065 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3066 child.getDisplayList(); 3067 child.mRecreateDisplayList = false; 3068 } 3069 } 3070 if (mOverlay != null) { 3071 View overlayView = mOverlay.getOverlayView(); 3072 overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) 3073 == PFLAG_INVALIDATED; 3074 overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; 3075 overlayView.getDisplayList(); 3076 overlayView.mRecreateDisplayList = false; 3077 } 3078 } 3079 3080 /** 3081 * Draw one child of this View Group. This method is responsible for getting 3082 * the canvas in the right state. This includes clipping, translating so 3083 * that the child's scrolled origin is at 0, 0, and applying any animation 3084 * transformations. 3085 * 3086 * @param canvas The canvas on which to draw the child 3087 * @param child Who to draw 3088 * @param drawingTime The time at which draw is occurring 3089 * @return True if an invalidate() was issued 3090 */ 3091 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3092 return child.draw(canvas, this, drawingTime); 3093 } 3094 3095 /** 3096 * Returns whether ths group's children are clipped to their bounds before drawing. 3097 * The default value is true. 3098 * @see #setClipChildren(boolean) 3099 * 3100 * @return True if the group's children will be clipped to their bounds, 3101 * false otherwise. 3102 */ 3103 public boolean getClipChildren() { 3104 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3105 } 3106 3107 /** 3108 * By default, children are clipped to their bounds before drawing. This 3109 * allows view groups to override this behavior for animations, etc. 3110 * 3111 * @param clipChildren true to clip children to their bounds, 3112 * false otherwise 3113 * @attr ref android.R.styleable#ViewGroup_clipChildren 3114 */ 3115 public void setClipChildren(boolean clipChildren) { 3116 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3117 if (clipChildren != previousValue) { 3118 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3119 for (int i = 0; i < mChildrenCount; ++i) { 3120 View child = getChildAt(i); 3121 if (child.mDisplayList != null) { 3122 child.mDisplayList.setClipToBounds(clipChildren); 3123 } 3124 } 3125 } 3126 } 3127 3128 /** 3129 * By default, children are clipped to the padding of the ViewGroup. This 3130 * allows view groups to override this behavior 3131 * 3132 * @param clipToPadding true to clip children to the padding of the 3133 * group, false otherwise 3134 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3135 */ 3136 public void setClipToPadding(boolean clipToPadding) { 3137 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3138 } 3139 3140 /** 3141 * {@inheritDoc} 3142 */ 3143 @Override 3144 public void dispatchSetSelected(boolean selected) { 3145 final View[] children = mChildren; 3146 final int count = mChildrenCount; 3147 for (int i = 0; i < count; i++) { 3148 children[i].setSelected(selected); 3149 } 3150 } 3151 3152 /** 3153 * {@inheritDoc} 3154 */ 3155 @Override 3156 public void dispatchSetActivated(boolean activated) { 3157 final View[] children = mChildren; 3158 final int count = mChildrenCount; 3159 for (int i = 0; i < count; i++) { 3160 children[i].setActivated(activated); 3161 } 3162 } 3163 3164 @Override 3165 protected void dispatchSetPressed(boolean pressed) { 3166 final View[] children = mChildren; 3167 final int count = mChildrenCount; 3168 for (int i = 0; i < count; i++) { 3169 final View child = children[i]; 3170 // Children that are clickable on their own should not 3171 // show a pressed state when their parent view does. 3172 // Clearing a pressed state always propagates. 3173 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3174 child.setPressed(pressed); 3175 } 3176 } 3177 } 3178 3179 /** 3180 * When this property is set to true, this ViewGroup supports static transformations on 3181 * children; this causes 3182 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3183 * invoked when a child is drawn. 3184 * 3185 * Any subclass overriding 3186 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3187 * set this property to true. 3188 * 3189 * @param enabled True to enable static transformations on children, false otherwise. 3190 * 3191 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3192 */ 3193 protected void setStaticTransformationsEnabled(boolean enabled) { 3194 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3195 } 3196 3197 /** 3198 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3199 * boolean to indicate whether a static transform was set. The default implementation 3200 * simply returns <code>false</code>; subclasses may override this method for different 3201 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3202 * for this method to be called. 3203 * 3204 * @param child The child view whose static transform is being requested 3205 * @param t The Transformation which will hold the result 3206 * @return true if the transformation was set, false otherwise 3207 * @see #setStaticTransformationsEnabled(boolean) 3208 */ 3209 protected boolean getChildStaticTransformation(View child, Transformation t) { 3210 return false; 3211 } 3212 3213 /** 3214 * {@hide} 3215 */ 3216 @Override 3217 protected View findViewTraversal(int id) { 3218 if (id == mID) { 3219 return this; 3220 } 3221 3222 final View[] where = mChildren; 3223 final int len = mChildrenCount; 3224 3225 for (int i = 0; i < len; i++) { 3226 View v = where[i]; 3227 3228 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3229 v = v.findViewById(id); 3230 3231 if (v != null) { 3232 return v; 3233 } 3234 } 3235 } 3236 3237 return null; 3238 } 3239 3240 /** 3241 * {@hide} 3242 */ 3243 @Override 3244 protected View findViewWithTagTraversal(Object tag) { 3245 if (tag != null && tag.equals(mTag)) { 3246 return this; 3247 } 3248 3249 final View[] where = mChildren; 3250 final int len = mChildrenCount; 3251 3252 for (int i = 0; i < len; i++) { 3253 View v = where[i]; 3254 3255 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3256 v = v.findViewWithTag(tag); 3257 3258 if (v != null) { 3259 return v; 3260 } 3261 } 3262 } 3263 3264 return null; 3265 } 3266 3267 /** 3268 * {@hide} 3269 */ 3270 @Override 3271 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3272 if (predicate.apply(this)) { 3273 return this; 3274 } 3275 3276 final View[] where = mChildren; 3277 final int len = mChildrenCount; 3278 3279 for (int i = 0; i < len; i++) { 3280 View v = where[i]; 3281 3282 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3283 v = v.findViewByPredicate(predicate); 3284 3285 if (v != null) { 3286 return v; 3287 } 3288 } 3289 } 3290 3291 return null; 3292 } 3293 3294 /** 3295 * <p>Adds a child view. If no layout parameters are already set on the child, the 3296 * default parameters for this ViewGroup are set on the child.</p> 3297 * 3298 * <p><strong>Note:</strong> do not invoke this method from 3299 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3300 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3301 * 3302 * @param child the child view to add 3303 * 3304 * @see #generateDefaultLayoutParams() 3305 */ 3306 public void addView(View child) { 3307 addView(child, -1); 3308 } 3309 3310 /** 3311 * Adds a child view. If no layout parameters are already set on the child, the 3312 * default parameters for this ViewGroup are set on the child. 3313 * 3314 * <p><strong>Note:</strong> do not invoke this method from 3315 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3316 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3317 * 3318 * @param child the child view to add 3319 * @param index the position at which to add the child 3320 * 3321 * @see #generateDefaultLayoutParams() 3322 */ 3323 public void addView(View child, int index) { 3324 LayoutParams params = child.getLayoutParams(); 3325 if (params == null) { 3326 params = generateDefaultLayoutParams(); 3327 if (params == null) { 3328 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3329 } 3330 } 3331 addView(child, index, params); 3332 } 3333 3334 /** 3335 * Adds a child view with this ViewGroup's default layout parameters and the 3336 * specified width and height. 3337 * 3338 * <p><strong>Note:</strong> do not invoke this method from 3339 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3340 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3341 * 3342 * @param child the child view to add 3343 */ 3344 public void addView(View child, int width, int height) { 3345 final LayoutParams params = generateDefaultLayoutParams(); 3346 params.width = width; 3347 params.height = height; 3348 addView(child, -1, params); 3349 } 3350 3351 /** 3352 * Adds a child view with the specified layout parameters. 3353 * 3354 * <p><strong>Note:</strong> do not invoke this method from 3355 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3356 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3357 * 3358 * @param child the child view to add 3359 * @param params the layout parameters to set on the child 3360 */ 3361 public void addView(View child, LayoutParams params) { 3362 addView(child, -1, params); 3363 } 3364 3365 /** 3366 * Adds a child view with the specified layout parameters. 3367 * 3368 * <p><strong>Note:</strong> do not invoke this method from 3369 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3370 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3371 * 3372 * @param child the child view to add 3373 * @param index the position at which to add the child 3374 * @param params the layout parameters to set on the child 3375 */ 3376 public void addView(View child, int index, LayoutParams params) { 3377 if (DBG) { 3378 System.out.println(this + " addView"); 3379 } 3380 3381 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3382 // therefore, we call requestLayout() on ourselves before, so that the child's request 3383 // will be blocked at our level 3384 requestLayout(); 3385 invalidate(true); 3386 addViewInner(child, index, params, false); 3387 } 3388 3389 /** 3390 * {@inheritDoc} 3391 */ 3392 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3393 if (!checkLayoutParams(params)) { 3394 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3395 } 3396 if (view.mParent != this) { 3397 throw new IllegalArgumentException("Given view not a child of " + this); 3398 } 3399 view.setLayoutParams(params); 3400 } 3401 3402 /** 3403 * {@inheritDoc} 3404 */ 3405 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3406 return p != null; 3407 } 3408 3409 /** 3410 * Interface definition for a callback to be invoked when the hierarchy 3411 * within this view changed. The hierarchy changes whenever a child is added 3412 * to or removed from this view. 3413 */ 3414 public interface OnHierarchyChangeListener { 3415 /** 3416 * Called when a new child is added to a parent view. 3417 * 3418 * @param parent the view in which a child was added 3419 * @param child the new child view added in the hierarchy 3420 */ 3421 void onChildViewAdded(View parent, View child); 3422 3423 /** 3424 * Called when a child is removed from a parent view. 3425 * 3426 * @param parent the view from which the child was removed 3427 * @param child the child removed from the hierarchy 3428 */ 3429 void onChildViewRemoved(View parent, View child); 3430 } 3431 3432 /** 3433 * Register a callback to be invoked when a child is added to or removed 3434 * from this view. 3435 * 3436 * @param listener the callback to invoke on hierarchy change 3437 */ 3438 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3439 mOnHierarchyChangeListener = listener; 3440 } 3441 3442 /** 3443 * @hide 3444 */ 3445 protected void onViewAdded(View child) { 3446 if (mOnHierarchyChangeListener != null) { 3447 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3448 } 3449 } 3450 3451 /** 3452 * @hide 3453 */ 3454 protected void onViewRemoved(View child) { 3455 if (mOnHierarchyChangeListener != null) { 3456 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3457 } 3458 } 3459 3460 private void clearCachedLayoutMode() { 3461 if (!getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3462 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3463 } 3464 } 3465 3466 @Override 3467 protected void onAttachedToWindow() { 3468 super.onAttachedToWindow(); 3469 clearCachedLayoutMode(); 3470 } 3471 3472 @Override 3473 protected void onDetachedFromWindow() { 3474 super.onDetachedFromWindow(); 3475 clearCachedLayoutMode(); 3476 } 3477 3478 /** 3479 * Adds a view during layout. This is useful if in your onLayout() method, 3480 * you need to add more views (as does the list view for example). 3481 * 3482 * If index is negative, it means put it at the end of the list. 3483 * 3484 * @param child the view to add to the group 3485 * @param index the index at which the child must be added 3486 * @param params the layout parameters to associate with the child 3487 * @return true if the child was added, false otherwise 3488 */ 3489 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3490 return addViewInLayout(child, index, params, false); 3491 } 3492 3493 /** 3494 * Adds a view during layout. This is useful if in your onLayout() method, 3495 * you need to add more views (as does the list view for example). 3496 * 3497 * If index is negative, it means put it at the end of the list. 3498 * 3499 * @param child the view to add to the group 3500 * @param index the index at which the child must be added 3501 * @param params the layout parameters to associate with the child 3502 * @param preventRequestLayout if true, calling this method will not trigger a 3503 * layout request on child 3504 * @return true if the child was added, false otherwise 3505 */ 3506 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3507 boolean preventRequestLayout) { 3508 child.mParent = null; 3509 addViewInner(child, index, params, preventRequestLayout); 3510 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3511 return true; 3512 } 3513 3514 /** 3515 * Prevents the specified child to be laid out during the next layout pass. 3516 * 3517 * @param child the child on which to perform the cleanup 3518 */ 3519 protected void cleanupLayoutState(View child) { 3520 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3521 } 3522 3523 private void addViewInner(View child, int index, LayoutParams params, 3524 boolean preventRequestLayout) { 3525 3526 if (mTransition != null) { 3527 // Don't prevent other add transitions from completing, but cancel remove 3528 // transitions to let them complete the process before we add to the container 3529 mTransition.cancel(LayoutTransition.DISAPPEARING); 3530 } 3531 3532 if (child.getParent() != null) { 3533 throw new IllegalStateException("The specified child already has a parent. " + 3534 "You must call removeView() on the child's parent first."); 3535 } 3536 3537 if (mTransition != null) { 3538 mTransition.addChild(this, child); 3539 } 3540 3541 if (!checkLayoutParams(params)) { 3542 params = generateLayoutParams(params); 3543 } 3544 3545 if (preventRequestLayout) { 3546 child.mLayoutParams = params; 3547 } else { 3548 child.setLayoutParams(params); 3549 } 3550 3551 if (index < 0) { 3552 index = mChildrenCount; 3553 } 3554 3555 addInArray(child, index); 3556 3557 // tell our children 3558 if (preventRequestLayout) { 3559 child.assignParent(this); 3560 } else { 3561 child.mParent = this; 3562 } 3563 3564 if (child.hasFocus()) { 3565 requestChildFocus(child, child.findFocus()); 3566 } 3567 3568 AttachInfo ai = mAttachInfo; 3569 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3570 boolean lastKeepOn = ai.mKeepScreenOn; 3571 ai.mKeepScreenOn = false; 3572 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3573 if (ai.mKeepScreenOn) { 3574 needGlobalAttributesUpdate(true); 3575 } 3576 ai.mKeepScreenOn = lastKeepOn; 3577 } 3578 3579 if (child.isLayoutDirectionInherited()) { 3580 child.resetRtlProperties(); 3581 } 3582 3583 onViewAdded(child); 3584 3585 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3586 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3587 } 3588 3589 if (child.hasTransientState()) { 3590 childHasTransientStateChanged(child, true); 3591 } 3592 } 3593 3594 private void addInArray(View child, int index) { 3595 View[] children = mChildren; 3596 final int count = mChildrenCount; 3597 final int size = children.length; 3598 if (index == count) { 3599 if (size == count) { 3600 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3601 System.arraycopy(children, 0, mChildren, 0, size); 3602 children = mChildren; 3603 } 3604 children[mChildrenCount++] = child; 3605 } else if (index < count) { 3606 if (size == count) { 3607 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3608 System.arraycopy(children, 0, mChildren, 0, index); 3609 System.arraycopy(children, index, mChildren, index + 1, count - index); 3610 children = mChildren; 3611 } else { 3612 System.arraycopy(children, index, children, index + 1, count - index); 3613 } 3614 children[index] = child; 3615 mChildrenCount++; 3616 if (mLastTouchDownIndex >= index) { 3617 mLastTouchDownIndex++; 3618 } 3619 } else { 3620 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3621 } 3622 } 3623 3624 // This method also sets the child's mParent to null 3625 private void removeFromArray(int index) { 3626 final View[] children = mChildren; 3627 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3628 children[index].mParent = null; 3629 } 3630 final int count = mChildrenCount; 3631 if (index == count - 1) { 3632 children[--mChildrenCount] = null; 3633 } else if (index >= 0 && index < count) { 3634 System.arraycopy(children, index + 1, children, index, count - index - 1); 3635 children[--mChildrenCount] = null; 3636 } else { 3637 throw new IndexOutOfBoundsException(); 3638 } 3639 if (mLastTouchDownIndex == index) { 3640 mLastTouchDownTime = 0; 3641 mLastTouchDownIndex = -1; 3642 } else if (mLastTouchDownIndex > index) { 3643 mLastTouchDownIndex--; 3644 } 3645 } 3646 3647 // This method also sets the children's mParent to null 3648 private void removeFromArray(int start, int count) { 3649 final View[] children = mChildren; 3650 final int childrenCount = mChildrenCount; 3651 3652 start = Math.max(0, start); 3653 final int end = Math.min(childrenCount, start + count); 3654 3655 if (start == end) { 3656 return; 3657 } 3658 3659 if (end == childrenCount) { 3660 for (int i = start; i < end; i++) { 3661 children[i].mParent = null; 3662 children[i] = null; 3663 } 3664 } else { 3665 for (int i = start; i < end; i++) { 3666 children[i].mParent = null; 3667 } 3668 3669 // Since we're looping above, we might as well do the copy, but is arraycopy() 3670 // faster than the extra 2 bounds checks we would do in the loop? 3671 System.arraycopy(children, end, children, start, childrenCount - end); 3672 3673 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3674 children[i] = null; 3675 } 3676 } 3677 3678 mChildrenCount -= (end - start); 3679 } 3680 3681 private void bindLayoutAnimation(View child) { 3682 Animation a = mLayoutAnimationController.getAnimationForView(child); 3683 child.setAnimation(a); 3684 } 3685 3686 /** 3687 * Subclasses should override this method to set layout animation 3688 * parameters on the supplied child. 3689 * 3690 * @param child the child to associate with animation parameters 3691 * @param params the child's layout parameters which hold the animation 3692 * parameters 3693 * @param index the index of the child in the view group 3694 * @param count the number of children in the view group 3695 */ 3696 protected void attachLayoutAnimationParameters(View child, 3697 LayoutParams params, int index, int count) { 3698 LayoutAnimationController.AnimationParameters animationParams = 3699 params.layoutAnimationParameters; 3700 if (animationParams == null) { 3701 animationParams = new LayoutAnimationController.AnimationParameters(); 3702 params.layoutAnimationParameters = animationParams; 3703 } 3704 3705 animationParams.count = count; 3706 animationParams.index = index; 3707 } 3708 3709 /** 3710 * {@inheritDoc} 3711 * 3712 * <p><strong>Note:</strong> do not invoke this method from 3713 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3714 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3715 */ 3716 public void removeView(View view) { 3717 removeViewInternal(view); 3718 requestLayout(); 3719 invalidate(true); 3720 } 3721 3722 /** 3723 * Removes a view during layout. This is useful if in your onLayout() method, 3724 * you need to remove more views. 3725 * 3726 * <p><strong>Note:</strong> do not invoke this method from 3727 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3728 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3729 * 3730 * @param view the view to remove from the group 3731 */ 3732 public void removeViewInLayout(View view) { 3733 removeViewInternal(view); 3734 } 3735 3736 /** 3737 * Removes a range of views during layout. This is useful if in your onLayout() method, 3738 * you need to remove more views. 3739 * 3740 * <p><strong>Note:</strong> do not invoke this method from 3741 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3742 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3743 * 3744 * @param start the index of the first view to remove from the group 3745 * @param count the number of views to remove from the group 3746 */ 3747 public void removeViewsInLayout(int start, int count) { 3748 removeViewsInternal(start, count); 3749 } 3750 3751 /** 3752 * Removes the view at the specified position in the group. 3753 * 3754 * <p><strong>Note:</strong> do not invoke this method from 3755 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3756 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3757 * 3758 * @param index the position in the group of the view to remove 3759 */ 3760 public void removeViewAt(int index) { 3761 removeViewInternal(index, getChildAt(index)); 3762 requestLayout(); 3763 invalidate(true); 3764 } 3765 3766 /** 3767 * Removes the specified range of views from the group. 3768 * 3769 * <p><strong>Note:</strong> do not invoke this method from 3770 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3771 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3772 * 3773 * @param start the first position in the group of the range of views to remove 3774 * @param count the number of views to remove 3775 */ 3776 public void removeViews(int start, int count) { 3777 removeViewsInternal(start, count); 3778 requestLayout(); 3779 invalidate(true); 3780 } 3781 3782 private void removeViewInternal(View view) { 3783 final int index = indexOfChild(view); 3784 if (index >= 0) { 3785 removeViewInternal(index, view); 3786 } 3787 } 3788 3789 private void removeViewInternal(int index, View view) { 3790 3791 if (mTransition != null) { 3792 mTransition.removeChild(this, view); 3793 } 3794 3795 boolean clearChildFocus = false; 3796 if (view == mFocused) { 3797 view.unFocus(); 3798 clearChildFocus = true; 3799 } 3800 3801 if (view.isAccessibilityFocused()) { 3802 view.clearAccessibilityFocus(); 3803 } 3804 3805 cancelTouchTarget(view); 3806 cancelHoverTarget(view); 3807 3808 if (view.getAnimation() != null || 3809 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3810 addDisappearingView(view); 3811 } else if (view.mAttachInfo != null) { 3812 view.dispatchDetachedFromWindow(); 3813 } 3814 3815 if (view.hasTransientState()) { 3816 childHasTransientStateChanged(view, false); 3817 } 3818 3819 needGlobalAttributesUpdate(false); 3820 3821 removeFromArray(index); 3822 3823 if (clearChildFocus) { 3824 clearChildFocus(view); 3825 if (!rootViewRequestFocus()) { 3826 notifyGlobalFocusCleared(this); 3827 } 3828 } 3829 3830 onViewRemoved(view); 3831 } 3832 3833 /** 3834 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3835 * not null, changes in layout which occur because of children being added to or removed from 3836 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3837 * object. By default, the transition object is null (so layout changes are not animated). 3838 * 3839 * @param transition The LayoutTransition object that will animated changes in layout. A value 3840 * of <code>null</code> means no transition will run on layout changes. 3841 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3842 */ 3843 public void setLayoutTransition(LayoutTransition transition) { 3844 if (mTransition != null) { 3845 mTransition.removeTransitionListener(mLayoutTransitionListener); 3846 } 3847 mTransition = transition; 3848 if (mTransition != null) { 3849 mTransition.addTransitionListener(mLayoutTransitionListener); 3850 } 3851 } 3852 3853 /** 3854 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3855 * not null, changes in layout which occur because of children being added to or removed from 3856 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3857 * object. By default, the transition object is null (so layout changes are not animated). 3858 * 3859 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3860 * A value of <code>null</code> means no transition will run on layout changes. 3861 */ 3862 public LayoutTransition getLayoutTransition() { 3863 return mTransition; 3864 } 3865 3866 private void removeViewsInternal(int start, int count) { 3867 final View focused = mFocused; 3868 final boolean detach = mAttachInfo != null; 3869 boolean clearChildFocus = false; 3870 3871 final View[] children = mChildren; 3872 final int end = start + count; 3873 3874 for (int i = start; i < end; i++) { 3875 final View view = children[i]; 3876 3877 if (mTransition != null) { 3878 mTransition.removeChild(this, view); 3879 } 3880 3881 if (view == focused) { 3882 view.unFocus(); 3883 clearChildFocus = true; 3884 } 3885 3886 if (view.isAccessibilityFocused()) { 3887 view.clearAccessibilityFocus(); 3888 } 3889 3890 cancelTouchTarget(view); 3891 cancelHoverTarget(view); 3892 3893 if (view.getAnimation() != null || 3894 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3895 addDisappearingView(view); 3896 } else if (detach) { 3897 view.dispatchDetachedFromWindow(); 3898 } 3899 3900 if (view.hasTransientState()) { 3901 childHasTransientStateChanged(view, false); 3902 } 3903 3904 needGlobalAttributesUpdate(false); 3905 3906 onViewRemoved(view); 3907 } 3908 3909 removeFromArray(start, count); 3910 3911 if (clearChildFocus) { 3912 clearChildFocus(focused); 3913 if (!rootViewRequestFocus()) { 3914 notifyGlobalFocusCleared(focused); 3915 } 3916 } 3917 } 3918 3919 /** 3920 * Call this method to remove all child views from the 3921 * ViewGroup. 3922 * 3923 * <p><strong>Note:</strong> do not invoke this method from 3924 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3925 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3926 */ 3927 public void removeAllViews() { 3928 removeAllViewsInLayout(); 3929 requestLayout(); 3930 invalidate(true); 3931 } 3932 3933 /** 3934 * Called by a ViewGroup subclass to remove child views from itself, 3935 * when it must first know its size on screen before it can calculate how many 3936 * child views it will render. An example is a Gallery or a ListView, which 3937 * may "have" 50 children, but actually only render the number of children 3938 * that can currently fit inside the object on screen. Do not call 3939 * this method unless you are extending ViewGroup and understand the 3940 * view measuring and layout pipeline. 3941 * 3942 * <p><strong>Note:</strong> do not invoke this method from 3943 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3944 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3945 */ 3946 public void removeAllViewsInLayout() { 3947 final int count = mChildrenCount; 3948 if (count <= 0) { 3949 return; 3950 } 3951 3952 final View[] children = mChildren; 3953 mChildrenCount = 0; 3954 3955 final View focused = mFocused; 3956 final boolean detach = mAttachInfo != null; 3957 boolean clearChildFocus = false; 3958 3959 needGlobalAttributesUpdate(false); 3960 3961 for (int i = count - 1; i >= 0; i--) { 3962 final View view = children[i]; 3963 3964 if (mTransition != null) { 3965 mTransition.removeChild(this, view); 3966 } 3967 3968 if (view == focused) { 3969 view.unFocus(); 3970 clearChildFocus = true; 3971 } 3972 3973 if (view.isAccessibilityFocused()) { 3974 view.clearAccessibilityFocus(); 3975 } 3976 3977 cancelTouchTarget(view); 3978 cancelHoverTarget(view); 3979 3980 if (view.getAnimation() != null || 3981 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3982 addDisappearingView(view); 3983 } else if (detach) { 3984 view.dispatchDetachedFromWindow(); 3985 } 3986 3987 if (view.hasTransientState()) { 3988 childHasTransientStateChanged(view, false); 3989 } 3990 3991 onViewRemoved(view); 3992 3993 view.mParent = null; 3994 children[i] = null; 3995 } 3996 3997 if (clearChildFocus) { 3998 clearChildFocus(focused); 3999 if (!rootViewRequestFocus()) { 4000 notifyGlobalFocusCleared(focused); 4001 } 4002 } 4003 } 4004 4005 /** 4006 * Finishes the removal of a detached view. This method will dispatch the detached from 4007 * window event and notify the hierarchy change listener. 4008 * <p> 4009 * This method is intended to be lightweight and makes no assumptions about whether the 4010 * parent or child should be redrawn. Proper use of this method will include also making 4011 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4012 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4013 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4014 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4015 * 4016 * @param child the child to be definitely removed from the view hierarchy 4017 * @param animate if true and the view has an animation, the view is placed in the 4018 * disappearing views list, otherwise, it is detached from the window 4019 * 4020 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4021 * @see #detachAllViewsFromParent() 4022 * @see #detachViewFromParent(View) 4023 * @see #detachViewFromParent(int) 4024 */ 4025 protected void removeDetachedView(View child, boolean animate) { 4026 if (mTransition != null) { 4027 mTransition.removeChild(this, child); 4028 } 4029 4030 if (child == mFocused) { 4031 child.clearFocus(); 4032 } 4033 4034 child.clearAccessibilityFocus(); 4035 4036 cancelTouchTarget(child); 4037 cancelHoverTarget(child); 4038 4039 if ((animate && child.getAnimation() != null) || 4040 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4041 addDisappearingView(child); 4042 } else if (child.mAttachInfo != null) { 4043 child.dispatchDetachedFromWindow(); 4044 } 4045 4046 if (child.hasTransientState()) { 4047 childHasTransientStateChanged(child, false); 4048 } 4049 4050 onViewRemoved(child); 4051 } 4052 4053 /** 4054 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4055 * sets the layout parameters and puts the view in the list of children so that 4056 * it can be retrieved by calling {@link #getChildAt(int)}. 4057 * <p> 4058 * This method is intended to be lightweight and makes no assumptions about whether the 4059 * parent or child should be redrawn. Proper use of this method will include also making 4060 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4061 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4062 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4063 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4064 * <p> 4065 * This method should be called only for views which were detached from their parent. 4066 * 4067 * @param child the child to attach 4068 * @param index the index at which the child should be attached 4069 * @param params the layout parameters of the child 4070 * 4071 * @see #removeDetachedView(View, boolean) 4072 * @see #detachAllViewsFromParent() 4073 * @see #detachViewFromParent(View) 4074 * @see #detachViewFromParent(int) 4075 */ 4076 protected void attachViewToParent(View child, int index, LayoutParams params) { 4077 child.mLayoutParams = params; 4078 4079 if (index < 0) { 4080 index = mChildrenCount; 4081 } 4082 4083 addInArray(child, index); 4084 4085 child.mParent = this; 4086 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4087 & ~PFLAG_DRAWING_CACHE_VALID) 4088 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4089 this.mPrivateFlags |= PFLAG_INVALIDATED; 4090 4091 if (child.hasFocus()) { 4092 requestChildFocus(child, child.findFocus()); 4093 } 4094 } 4095 4096 /** 4097 * Detaches a view from its parent. Detaching a view should be followed 4098 * either by a call to 4099 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4100 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4101 * temporary; reattachment or removal should happen within the same drawing cycle as 4102 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4103 * call to {@link #getChildAt(int)}. 4104 * 4105 * @param child the child to detach 4106 * 4107 * @see #detachViewFromParent(int) 4108 * @see #detachViewsFromParent(int, int) 4109 * @see #detachAllViewsFromParent() 4110 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4111 * @see #removeDetachedView(View, boolean) 4112 */ 4113 protected void detachViewFromParent(View child) { 4114 removeFromArray(indexOfChild(child)); 4115 } 4116 4117 /** 4118 * Detaches a view from its parent. Detaching a view should be followed 4119 * either by a call to 4120 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4121 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4122 * temporary; reattachment or removal should happen within the same drawing cycle as 4123 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4124 * call to {@link #getChildAt(int)}. 4125 * 4126 * @param index the index of the child to detach 4127 * 4128 * @see #detachViewFromParent(View) 4129 * @see #detachAllViewsFromParent() 4130 * @see #detachViewsFromParent(int, int) 4131 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4132 * @see #removeDetachedView(View, boolean) 4133 */ 4134 protected void detachViewFromParent(int index) { 4135 removeFromArray(index); 4136 } 4137 4138 /** 4139 * Detaches a range of views from their parents. Detaching a view should be followed 4140 * either by a call to 4141 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4142 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4143 * temporary; reattachment or removal should happen within the same drawing cycle as 4144 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4145 * call to {@link #getChildAt(int)}. 4146 * 4147 * @param start the first index of the childrend range to detach 4148 * @param count the number of children to detach 4149 * 4150 * @see #detachViewFromParent(View) 4151 * @see #detachViewFromParent(int) 4152 * @see #detachAllViewsFromParent() 4153 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4154 * @see #removeDetachedView(View, boolean) 4155 */ 4156 protected void detachViewsFromParent(int start, int count) { 4157 removeFromArray(start, count); 4158 } 4159 4160 /** 4161 * Detaches all views from the parent. Detaching a view should be followed 4162 * either by a call to 4163 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4164 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4165 * temporary; reattachment or removal should happen within the same drawing cycle as 4166 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4167 * call to {@link #getChildAt(int)}. 4168 * 4169 * @see #detachViewFromParent(View) 4170 * @see #detachViewFromParent(int) 4171 * @see #detachViewsFromParent(int, int) 4172 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4173 * @see #removeDetachedView(View, boolean) 4174 */ 4175 protected void detachAllViewsFromParent() { 4176 final int count = mChildrenCount; 4177 if (count <= 0) { 4178 return; 4179 } 4180 4181 final View[] children = mChildren; 4182 mChildrenCount = 0; 4183 4184 for (int i = count - 1; i >= 0; i--) { 4185 children[i].mParent = null; 4186 children[i] = null; 4187 } 4188 } 4189 4190 /** 4191 * Don't call or override this method. It is used for the implementation of 4192 * the view hierarchy. 4193 */ 4194 public final void invalidateChild(View child, final Rect dirty) { 4195 ViewParent parent = this; 4196 4197 final AttachInfo attachInfo = mAttachInfo; 4198 if (attachInfo != null) { 4199 // If the child is drawing an animation, we want to copy this flag onto 4200 // ourselves and the parent to make sure the invalidate request goes 4201 // through 4202 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4203 == PFLAG_DRAW_ANIMATION; 4204 4205 // Check whether the child that requests the invalidate is fully opaque 4206 // Views being animated or transformed are not considered opaque because we may 4207 // be invalidating their old position and need the parent to paint behind them. 4208 Matrix childMatrix = child.getMatrix(); 4209 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4210 child.getAnimation() == null && childMatrix.isIdentity(); 4211 // Mark the child as dirty, using the appropriate flag 4212 // Make sure we do not set both flags at the same time 4213 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4214 4215 if (child.mLayerType != LAYER_TYPE_NONE) { 4216 mPrivateFlags |= PFLAG_INVALIDATED; 4217 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4218 child.mLocalDirtyRect.union(dirty); 4219 } 4220 4221 final int[] location = attachInfo.mInvalidateChildLocation; 4222 location[CHILD_LEFT_INDEX] = child.mLeft; 4223 location[CHILD_TOP_INDEX] = child.mTop; 4224 if (!childMatrix.isIdentity() || 4225 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4226 RectF boundingRect = attachInfo.mTmpTransformRect; 4227 boundingRect.set(dirty); 4228 Matrix transformMatrix; 4229 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4230 Transformation t = attachInfo.mTmpTransformation; 4231 boolean transformed = getChildStaticTransformation(child, t); 4232 if (transformed) { 4233 transformMatrix = attachInfo.mTmpMatrix; 4234 transformMatrix.set(t.getMatrix()); 4235 if (!childMatrix.isIdentity()) { 4236 transformMatrix.preConcat(childMatrix); 4237 } 4238 } else { 4239 transformMatrix = childMatrix; 4240 } 4241 } else { 4242 transformMatrix = childMatrix; 4243 } 4244 transformMatrix.mapRect(boundingRect); 4245 dirty.set((int) (boundingRect.left - 0.5f), 4246 (int) (boundingRect.top - 0.5f), 4247 (int) (boundingRect.right + 0.5f), 4248 (int) (boundingRect.bottom + 0.5f)); 4249 } 4250 4251 do { 4252 View view = null; 4253 if (parent instanceof View) { 4254 view = (View) parent; 4255 } 4256 4257 if (drawAnimation) { 4258 if (view != null) { 4259 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4260 } else if (parent instanceof ViewRootImpl) { 4261 ((ViewRootImpl) parent).mIsAnimating = true; 4262 } 4263 } 4264 4265 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4266 // flag coming from the child that initiated the invalidate 4267 if (view != null) { 4268 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4269 view.getSolidColor() == 0) { 4270 opaqueFlag = PFLAG_DIRTY; 4271 } 4272 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4273 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4274 } 4275 } 4276 4277 parent = parent.invalidateChildInParent(location, dirty); 4278 if (view != null) { 4279 // Account for transform on current parent 4280 Matrix m = view.getMatrix(); 4281 if (!m.isIdentity()) { 4282 RectF boundingRect = attachInfo.mTmpTransformRect; 4283 boundingRect.set(dirty); 4284 m.mapRect(boundingRect); 4285 dirty.set((int) (boundingRect.left - 0.5f), 4286 (int) (boundingRect.top - 0.5f), 4287 (int) (boundingRect.right + 0.5f), 4288 (int) (boundingRect.bottom + 0.5f)); 4289 } 4290 } 4291 } while (parent != null); 4292 } 4293 } 4294 4295 /** 4296 * Don't call or override this method. It is used for the implementation of 4297 * the view hierarchy. 4298 * 4299 * This implementation returns null if this ViewGroup does not have a parent, 4300 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4301 * does not intersect with this ViewGroup's bounds. 4302 */ 4303 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4304 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4305 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4306 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4307 FLAG_OPTIMIZE_INVALIDATE) { 4308 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4309 location[CHILD_TOP_INDEX] - mScrollY); 4310 4311 final int left = mLeft; 4312 final int top = mTop; 4313 4314 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4315 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4316 dirty.setEmpty(); 4317 } 4318 } 4319 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4320 4321 location[CHILD_LEFT_INDEX] = left; 4322 location[CHILD_TOP_INDEX] = top; 4323 4324 if (mLayerType != LAYER_TYPE_NONE) { 4325 mPrivateFlags |= PFLAG_INVALIDATED; 4326 mLocalDirtyRect.union(dirty); 4327 } 4328 4329 return mParent; 4330 4331 } else { 4332 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4333 4334 location[CHILD_LEFT_INDEX] = mLeft; 4335 location[CHILD_TOP_INDEX] = mTop; 4336 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4337 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4338 } else { 4339 // in case the dirty rect extends outside the bounds of this container 4340 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4341 } 4342 4343 if (mLayerType != LAYER_TYPE_NONE) { 4344 mPrivateFlags |= PFLAG_INVALIDATED; 4345 mLocalDirtyRect.union(dirty); 4346 } 4347 4348 return mParent; 4349 } 4350 } 4351 4352 return null; 4353 } 4354 4355 /** 4356 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4357 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4358 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4359 * 4360 * @hide 4361 */ 4362 public void invalidateChildFast(View child, final Rect dirty) { 4363 ViewParent parent = this; 4364 4365 final AttachInfo attachInfo = mAttachInfo; 4366 if (attachInfo != null) { 4367 if (child.mLayerType != LAYER_TYPE_NONE) { 4368 child.mLocalDirtyRect.union(dirty); 4369 } 4370 4371 int left = child.mLeft; 4372 int top = child.mTop; 4373 if (!child.getMatrix().isIdentity()) { 4374 child.transformRect(dirty); 4375 } 4376 4377 do { 4378 if (parent instanceof ViewGroup) { 4379 ViewGroup parentVG = (ViewGroup) parent; 4380 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4381 // Layered parents should be recreated, not just re-issued 4382 parentVG.invalidate(); 4383 parent = null; 4384 } else { 4385 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4386 left = parentVG.mLeft; 4387 top = parentVG.mTop; 4388 } 4389 } else { 4390 // Reached the top; this calls into the usual invalidate method in 4391 // ViewRootImpl, which schedules a traversal 4392 final int[] location = attachInfo.mInvalidateChildLocation; 4393 location[0] = left; 4394 location[1] = top; 4395 parent = parent.invalidateChildInParent(location, dirty); 4396 } 4397 } while (parent != null); 4398 } 4399 } 4400 4401 /** 4402 * Quick invalidation method that simply transforms the dirty rect into the parent's 4403 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4404 */ 4405 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4406 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4407 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4408 dirty.offset(left - mScrollX, top - mScrollY); 4409 4410 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4411 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4412 4413 if (mLayerType != LAYER_TYPE_NONE) { 4414 mLocalDirtyRect.union(dirty); 4415 } 4416 if (!getMatrix().isIdentity()) { 4417 transformRect(dirty); 4418 } 4419 4420 return mParent; 4421 } 4422 } 4423 4424 return null; 4425 } 4426 4427 /** 4428 * Offset a rectangle that is in a descendant's coordinate 4429 * space into our coordinate space. 4430 * @param descendant A descendant of this view 4431 * @param rect A rectangle defined in descendant's coordinate space. 4432 */ 4433 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4434 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4435 } 4436 4437 /** 4438 * Offset a rectangle that is in our coordinate space into an ancestor's 4439 * coordinate space. 4440 * @param descendant A descendant of this view 4441 * @param rect A rectangle defined in descendant's coordinate space. 4442 */ 4443 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4444 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4445 } 4446 4447 /** 4448 * Helper method that offsets a rect either from parent to descendant or 4449 * descendant to parent. 4450 */ 4451 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4452 boolean offsetFromChildToParent, boolean clipToBounds) { 4453 4454 // already in the same coord system :) 4455 if (descendant == this) { 4456 return; 4457 } 4458 4459 ViewParent theParent = descendant.mParent; 4460 4461 // search and offset up to the parent 4462 while ((theParent != null) 4463 && (theParent instanceof View) 4464 && (theParent != this)) { 4465 4466 if (offsetFromChildToParent) { 4467 rect.offset(descendant.mLeft - descendant.mScrollX, 4468 descendant.mTop - descendant.mScrollY); 4469 if (clipToBounds) { 4470 View p = (View) theParent; 4471 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4472 } 4473 } else { 4474 if (clipToBounds) { 4475 View p = (View) theParent; 4476 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4477 } 4478 rect.offset(descendant.mScrollX - descendant.mLeft, 4479 descendant.mScrollY - descendant.mTop); 4480 } 4481 4482 descendant = (View) theParent; 4483 theParent = descendant.mParent; 4484 } 4485 4486 // now that we are up to this view, need to offset one more time 4487 // to get into our coordinate space 4488 if (theParent == this) { 4489 if (offsetFromChildToParent) { 4490 rect.offset(descendant.mLeft - descendant.mScrollX, 4491 descendant.mTop - descendant.mScrollY); 4492 } else { 4493 rect.offset(descendant.mScrollX - descendant.mLeft, 4494 descendant.mScrollY - descendant.mTop); 4495 } 4496 } else { 4497 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4498 } 4499 } 4500 4501 /** 4502 * Offset the vertical location of all children of this view by the specified number of pixels. 4503 * 4504 * @param offset the number of pixels to offset 4505 * 4506 * @hide 4507 */ 4508 public void offsetChildrenTopAndBottom(int offset) { 4509 final int count = mChildrenCount; 4510 final View[] children = mChildren; 4511 4512 for (int i = 0; i < count; i++) { 4513 final View v = children[i]; 4514 v.mTop += offset; 4515 v.mBottom += offset; 4516 if (v.mDisplayList != null) { 4517 v.mDisplayList.offsetTopAndBottom(offset); 4518 invalidateViewProperty(false, false); 4519 } 4520 } 4521 } 4522 4523 /** 4524 * {@inheritDoc} 4525 */ 4526 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4527 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4528 // but for some simple tests it can be useful. If we don't have attach info this 4529 // will allocate memory. 4530 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4531 rect.set(r); 4532 4533 if (!child.hasIdentityMatrix()) { 4534 child.getMatrix().mapRect(rect); 4535 } 4536 4537 int dx = child.mLeft - mScrollX; 4538 int dy = child.mTop - mScrollY; 4539 4540 rect.offset(dx, dy); 4541 4542 if (offset != null) { 4543 if (!child.hasIdentityMatrix()) { 4544 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4545 : new float[2]; 4546 position[0] = offset.x; 4547 position[1] = offset.y; 4548 child.getMatrix().mapPoints(position); 4549 offset.x = (int) (position[0] + 0.5f); 4550 offset.y = (int) (position[1] + 0.5f); 4551 } 4552 offset.x += dx; 4553 offset.y += dy; 4554 } 4555 4556 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4557 if (mParent == null) return true; 4558 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4559 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4560 return mParent.getChildVisibleRect(this, r, offset); 4561 } 4562 4563 return false; 4564 } 4565 4566 /** 4567 * {@inheritDoc} 4568 */ 4569 @Override 4570 public final void layout(int l, int t, int r, int b) { 4571 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 4572 if (mTransition != null) { 4573 mTransition.layoutChange(this); 4574 } 4575 super.layout(l, t, r, b); 4576 } else { 4577 // record the fact that we noop'd it; request layout when transition finishes 4578 mLayoutCalledWhileSuppressed = true; 4579 } 4580 } 4581 4582 /** 4583 * {@inheritDoc} 4584 */ 4585 @Override 4586 protected abstract void onLayout(boolean changed, 4587 int l, int t, int r, int b); 4588 4589 /** 4590 * Indicates whether the view group has the ability to animate its children 4591 * after the first layout. 4592 * 4593 * @return true if the children can be animated, false otherwise 4594 */ 4595 protected boolean canAnimate() { 4596 return mLayoutAnimationController != null; 4597 } 4598 4599 /** 4600 * Runs the layout animation. Calling this method triggers a relayout of 4601 * this view group. 4602 */ 4603 public void startLayoutAnimation() { 4604 if (mLayoutAnimationController != null) { 4605 mGroupFlags |= FLAG_RUN_ANIMATION; 4606 requestLayout(); 4607 } 4608 } 4609 4610 /** 4611 * Schedules the layout animation to be played after the next layout pass 4612 * of this view group. This can be used to restart the layout animation 4613 * when the content of the view group changes or when the activity is 4614 * paused and resumed. 4615 */ 4616 public void scheduleLayoutAnimation() { 4617 mGroupFlags |= FLAG_RUN_ANIMATION; 4618 } 4619 4620 /** 4621 * Sets the layout animation controller used to animate the group's 4622 * children after the first layout. 4623 * 4624 * @param controller the animation controller 4625 */ 4626 public void setLayoutAnimation(LayoutAnimationController controller) { 4627 mLayoutAnimationController = controller; 4628 if (mLayoutAnimationController != null) { 4629 mGroupFlags |= FLAG_RUN_ANIMATION; 4630 } 4631 } 4632 4633 /** 4634 * Returns the layout animation controller used to animate the group's 4635 * children. 4636 * 4637 * @return the current animation controller 4638 */ 4639 public LayoutAnimationController getLayoutAnimation() { 4640 return mLayoutAnimationController; 4641 } 4642 4643 /** 4644 * Indicates whether the children's drawing cache is used during a layout 4645 * animation. By default, the drawing cache is enabled but this will prevent 4646 * nested layout animations from working. To nest animations, you must disable 4647 * the cache. 4648 * 4649 * @return true if the animation cache is enabled, false otherwise 4650 * 4651 * @see #setAnimationCacheEnabled(boolean) 4652 * @see View#setDrawingCacheEnabled(boolean) 4653 */ 4654 @ViewDebug.ExportedProperty 4655 public boolean isAnimationCacheEnabled() { 4656 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4657 } 4658 4659 /** 4660 * Enables or disables the children's drawing cache during a layout animation. 4661 * By default, the drawing cache is enabled but this will prevent nested 4662 * layout animations from working. To nest animations, you must disable the 4663 * cache. 4664 * 4665 * @param enabled true to enable the animation cache, false otherwise 4666 * 4667 * @see #isAnimationCacheEnabled() 4668 * @see View#setDrawingCacheEnabled(boolean) 4669 */ 4670 public void setAnimationCacheEnabled(boolean enabled) { 4671 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4672 } 4673 4674 /** 4675 * Indicates whether this ViewGroup will always try to draw its children using their 4676 * drawing cache. By default this property is enabled. 4677 * 4678 * @return true if the animation cache is enabled, false otherwise 4679 * 4680 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4681 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4682 * @see View#setDrawingCacheEnabled(boolean) 4683 */ 4684 @ViewDebug.ExportedProperty(category = "drawing") 4685 public boolean isAlwaysDrawnWithCacheEnabled() { 4686 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4687 } 4688 4689 /** 4690 * Indicates whether this ViewGroup will always try to draw its children using their 4691 * drawing cache. This property can be set to true when the cache rendering is 4692 * slightly different from the children's normal rendering. Renderings can be different, 4693 * for instance, when the cache's quality is set to low. 4694 * 4695 * When this property is disabled, the ViewGroup will use the drawing cache of its 4696 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4697 * when to start using the drawing cache and when to stop using it. 4698 * 4699 * @param always true to always draw with the drawing cache, false otherwise 4700 * 4701 * @see #isAlwaysDrawnWithCacheEnabled() 4702 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4703 * @see View#setDrawingCacheEnabled(boolean) 4704 * @see View#setDrawingCacheQuality(int) 4705 */ 4706 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4707 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4708 } 4709 4710 /** 4711 * Indicates whether the ViewGroup is currently drawing its children using 4712 * their drawing cache. 4713 * 4714 * @return true if children should be drawn with their cache, false otherwise 4715 * 4716 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4717 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4718 */ 4719 @ViewDebug.ExportedProperty(category = "drawing") 4720 protected boolean isChildrenDrawnWithCacheEnabled() { 4721 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4722 } 4723 4724 /** 4725 * Tells the ViewGroup to draw its children using their drawing cache. This property 4726 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4727 * will be used only if it has been enabled. 4728 * 4729 * Subclasses should call this method to start and stop using the drawing cache when 4730 * they perform performance sensitive operations, like scrolling or animating. 4731 * 4732 * @param enabled true if children should be drawn with their cache, false otherwise 4733 * 4734 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4735 * @see #isChildrenDrawnWithCacheEnabled() 4736 */ 4737 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4738 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4739 } 4740 4741 /** 4742 * Indicates whether the ViewGroup is drawing its children in the order defined by 4743 * {@link #getChildDrawingOrder(int, int)}. 4744 * 4745 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4746 * false otherwise 4747 * 4748 * @see #setChildrenDrawingOrderEnabled(boolean) 4749 * @see #getChildDrawingOrder(int, int) 4750 */ 4751 @ViewDebug.ExportedProperty(category = "drawing") 4752 protected boolean isChildrenDrawingOrderEnabled() { 4753 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4754 } 4755 4756 /** 4757 * Tells the ViewGroup whether to draw its children in the order defined by the method 4758 * {@link #getChildDrawingOrder(int, int)}. 4759 * 4760 * @param enabled true if the order of the children when drawing is determined by 4761 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4762 * 4763 * @see #isChildrenDrawingOrderEnabled() 4764 * @see #getChildDrawingOrder(int, int) 4765 */ 4766 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4767 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4768 } 4769 4770 private boolean getBooleanFlag(int flag) { 4771 return (mGroupFlags & flag) == flag; 4772 } 4773 4774 private void setBooleanFlag(int flag, boolean value) { 4775 if (value) { 4776 mGroupFlags |= flag; 4777 } else { 4778 mGroupFlags &= ~flag; 4779 } 4780 } 4781 4782 /** 4783 * Returns an integer indicating what types of drawing caches are kept in memory. 4784 * 4785 * @see #setPersistentDrawingCache(int) 4786 * @see #setAnimationCacheEnabled(boolean) 4787 * 4788 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4789 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4790 * and {@link #PERSISTENT_ALL_CACHES} 4791 */ 4792 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4793 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4794 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4795 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4796 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4797 }) 4798 public int getPersistentDrawingCache() { 4799 return mPersistentDrawingCache; 4800 } 4801 4802 /** 4803 * Indicates what types of drawing caches should be kept in memory after 4804 * they have been created. 4805 * 4806 * @see #getPersistentDrawingCache() 4807 * @see #setAnimationCacheEnabled(boolean) 4808 * 4809 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4810 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4811 * and {@link #PERSISTENT_ALL_CACHES} 4812 */ 4813 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4814 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4815 } 4816 4817 private void setLayoutMode(int layoutMode, boolean explicitly) { 4818 mLayoutMode = layoutMode; 4819 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4820 } 4821 4822 /** 4823 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4824 * descendants that had inherited a different layoutMode from a previous parent. 4825 * Recursion terminates when a descendant's mode is: 4826 * <ul> 4827 * <li>Undefined</li> 4828 * <li>The same as the root node's</li> 4829 * <li>A mode that had been explicitly set</li> 4830 * <ul/> 4831 * The first two clauses are optimizations. 4832 * @param layoutModeOfRoot 4833 */ 4834 @Override 4835 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4836 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4837 mLayoutMode == layoutModeOfRoot || 4838 getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4839 return; 4840 } 4841 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4842 4843 // apply recursively 4844 for (int i = 0, N = getChildCount(); i < N; i++) { 4845 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4846 } 4847 } 4848 4849 /** 4850 * Returns the basis of alignment during layout operations on this ViewGroup: 4851 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4852 * <p> 4853 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4854 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4855 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4856 * 4857 * @return the layout mode to use during layout operations 4858 * 4859 * @see #setLayoutMode(int) 4860 */ 4861 public int getLayoutMode() { 4862 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4863 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4864 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4865 setLayoutMode(inheritedLayoutMode, false); 4866 } 4867 return mLayoutMode; 4868 } 4869 4870 /** 4871 * Sets the basis of alignment during the layout of this ViewGroup. 4872 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4873 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4874 * 4875 * @param layoutMode the layout mode to use during layout operations 4876 * 4877 * @see #getLayoutMode() 4878 */ 4879 public void setLayoutMode(int layoutMode) { 4880 if (mLayoutMode != layoutMode) { 4881 invalidateInheritedLayoutMode(layoutMode); 4882 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4883 requestLayout(); 4884 } 4885 } 4886 4887 /** 4888 * Returns a new set of layout parameters based on the supplied attributes set. 4889 * 4890 * @param attrs the attributes to build the layout parameters from 4891 * 4892 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4893 * of its descendants 4894 */ 4895 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4896 return new LayoutParams(getContext(), attrs); 4897 } 4898 4899 /** 4900 * Returns a safe set of layout parameters based on the supplied layout params. 4901 * When a ViewGroup is passed a View whose layout params do not pass the test of 4902 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4903 * is invoked. This method should return a new set of layout params suitable for 4904 * this ViewGroup, possibly by copying the appropriate attributes from the 4905 * specified set of layout params. 4906 * 4907 * @param p The layout parameters to convert into a suitable set of layout parameters 4908 * for this ViewGroup. 4909 * 4910 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4911 * of its descendants 4912 */ 4913 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4914 return p; 4915 } 4916 4917 /** 4918 * Returns a set of default layout parameters. These parameters are requested 4919 * when the View passed to {@link #addView(View)} has no layout parameters 4920 * already set. If null is returned, an exception is thrown from addView. 4921 * 4922 * @return a set of default layout parameters or null 4923 */ 4924 protected LayoutParams generateDefaultLayoutParams() { 4925 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4926 } 4927 4928 /** 4929 * {@inheritDoc} 4930 */ 4931 @Override 4932 protected void debug(int depth) { 4933 super.debug(depth); 4934 String output; 4935 4936 if (mFocused != null) { 4937 output = debugIndent(depth); 4938 output += "mFocused"; 4939 Log.d(VIEW_LOG_TAG, output); 4940 } 4941 if (mChildrenCount != 0) { 4942 output = debugIndent(depth); 4943 output += "{"; 4944 Log.d(VIEW_LOG_TAG, output); 4945 } 4946 int count = mChildrenCount; 4947 for (int i = 0; i < count; i++) { 4948 View child = mChildren[i]; 4949 child.debug(depth + 1); 4950 } 4951 4952 if (mChildrenCount != 0) { 4953 output = debugIndent(depth); 4954 output += "}"; 4955 Log.d(VIEW_LOG_TAG, output); 4956 } 4957 } 4958 4959 /** 4960 * Returns the position in the group of the specified child view. 4961 * 4962 * @param child the view for which to get the position 4963 * @return a positive integer representing the position of the view in the 4964 * group, or -1 if the view does not exist in the group 4965 */ 4966 public int indexOfChild(View child) { 4967 final int count = mChildrenCount; 4968 final View[] children = mChildren; 4969 for (int i = 0; i < count; i++) { 4970 if (children[i] == child) { 4971 return i; 4972 } 4973 } 4974 return -1; 4975 } 4976 4977 /** 4978 * Returns the number of children in the group. 4979 * 4980 * @return a positive integer representing the number of children in 4981 * the group 4982 */ 4983 public int getChildCount() { 4984 return mChildrenCount; 4985 } 4986 4987 /** 4988 * Returns the view at the specified position in the group. 4989 * 4990 * @param index the position at which to get the view from 4991 * @return the view at the specified position or null if the position 4992 * does not exist within the group 4993 */ 4994 public View getChildAt(int index) { 4995 if (index < 0 || index >= mChildrenCount) { 4996 return null; 4997 } 4998 return mChildren[index]; 4999 } 5000 5001 /** 5002 * Ask all of the children of this view to measure themselves, taking into 5003 * account both the MeasureSpec requirements for this view and its padding. 5004 * We skip children that are in the GONE state The heavy lifting is done in 5005 * getChildMeasureSpec. 5006 * 5007 * @param widthMeasureSpec The width requirements for this view 5008 * @param heightMeasureSpec The height requirements for this view 5009 */ 5010 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5011 final int size = mChildrenCount; 5012 final View[] children = mChildren; 5013 for (int i = 0; i < size; ++i) { 5014 final View child = children[i]; 5015 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5016 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5017 } 5018 } 5019 } 5020 5021 /** 5022 * Ask one of the children of this view to measure itself, taking into 5023 * account both the MeasureSpec requirements for this view and its padding. 5024 * The heavy lifting is done in getChildMeasureSpec. 5025 * 5026 * @param child The child to measure 5027 * @param parentWidthMeasureSpec The width requirements for this view 5028 * @param parentHeightMeasureSpec The height requirements for this view 5029 */ 5030 protected void measureChild(View child, int parentWidthMeasureSpec, 5031 int parentHeightMeasureSpec) { 5032 final LayoutParams lp = child.getLayoutParams(); 5033 5034 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5035 mPaddingLeft + mPaddingRight, lp.width); 5036 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5037 mPaddingTop + mPaddingBottom, lp.height); 5038 5039 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5040 } 5041 5042 /** 5043 * Ask one of the children of this view to measure itself, taking into 5044 * account both the MeasureSpec requirements for this view and its padding 5045 * and margins. The child must have MarginLayoutParams The heavy lifting is 5046 * done in getChildMeasureSpec. 5047 * 5048 * @param child The child to measure 5049 * @param parentWidthMeasureSpec The width requirements for this view 5050 * @param widthUsed Extra space that has been used up by the parent 5051 * horizontally (possibly by other children of the parent) 5052 * @param parentHeightMeasureSpec The height requirements for this view 5053 * @param heightUsed Extra space that has been used up by the parent 5054 * vertically (possibly by other children of the parent) 5055 */ 5056 protected void measureChildWithMargins(View child, 5057 int parentWidthMeasureSpec, int widthUsed, 5058 int parentHeightMeasureSpec, int heightUsed) { 5059 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5060 5061 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5062 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5063 + widthUsed, lp.width); 5064 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5065 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5066 + heightUsed, lp.height); 5067 5068 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5069 } 5070 5071 /** 5072 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5073 * pass to a particular child. This method figures out the right MeasureSpec 5074 * for one dimension (height or width) of one child view. 5075 * 5076 * The goal is to combine information from our MeasureSpec with the 5077 * LayoutParams of the child to get the best possible results. For example, 5078 * if the this view knows its size (because its MeasureSpec has a mode of 5079 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5080 * to be the same size as the parent, the parent should ask the child to 5081 * layout given an exact size. 5082 * 5083 * @param spec The requirements for this view 5084 * @param padding The padding of this view for the current dimension and 5085 * margins, if applicable 5086 * @param childDimension How big the child wants to be in the current 5087 * dimension 5088 * @return a MeasureSpec integer for the child 5089 */ 5090 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5091 int specMode = MeasureSpec.getMode(spec); 5092 int specSize = MeasureSpec.getSize(spec); 5093 5094 int size = Math.max(0, specSize - padding); 5095 5096 int resultSize = 0; 5097 int resultMode = 0; 5098 5099 switch (specMode) { 5100 // Parent has imposed an exact size on us 5101 case MeasureSpec.EXACTLY: 5102 if (childDimension >= 0) { 5103 resultSize = childDimension; 5104 resultMode = MeasureSpec.EXACTLY; 5105 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5106 // Child wants to be our size. So be it. 5107 resultSize = size; 5108 resultMode = MeasureSpec.EXACTLY; 5109 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5110 // Child wants to determine its own size. It can't be 5111 // bigger than us. 5112 resultSize = size; 5113 resultMode = MeasureSpec.AT_MOST; 5114 } 5115 break; 5116 5117 // Parent has imposed a maximum size on us 5118 case MeasureSpec.AT_MOST: 5119 if (childDimension >= 0) { 5120 // Child wants a specific size... so be it 5121 resultSize = childDimension; 5122 resultMode = MeasureSpec.EXACTLY; 5123 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5124 // Child wants to be our size, but our size is not fixed. 5125 // Constrain child to not be bigger than us. 5126 resultSize = size; 5127 resultMode = MeasureSpec.AT_MOST; 5128 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5129 // Child wants to determine its own size. It can't be 5130 // bigger than us. 5131 resultSize = size; 5132 resultMode = MeasureSpec.AT_MOST; 5133 } 5134 break; 5135 5136 // Parent asked to see how big we want to be 5137 case MeasureSpec.UNSPECIFIED: 5138 if (childDimension >= 0) { 5139 // Child wants a specific size... let him have it 5140 resultSize = childDimension; 5141 resultMode = MeasureSpec.EXACTLY; 5142 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5143 // Child wants to be our size... find out how big it should 5144 // be 5145 resultSize = 0; 5146 resultMode = MeasureSpec.UNSPECIFIED; 5147 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5148 // Child wants to determine its own size.... find out how 5149 // big it should be 5150 resultSize = 0; 5151 resultMode = MeasureSpec.UNSPECIFIED; 5152 } 5153 break; 5154 } 5155 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5156 } 5157 5158 5159 /** 5160 * Removes any pending animations for views that have been removed. Call 5161 * this if you don't want animations for exiting views to stack up. 5162 */ 5163 public void clearDisappearingChildren() { 5164 if (mDisappearingChildren != null) { 5165 mDisappearingChildren.clear(); 5166 invalidate(); 5167 } 5168 } 5169 5170 /** 5171 * Add a view which is removed from mChildren but still needs animation 5172 * 5173 * @param v View to add 5174 */ 5175 private void addDisappearingView(View v) { 5176 ArrayList<View> disappearingChildren = mDisappearingChildren; 5177 5178 if (disappearingChildren == null) { 5179 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5180 } 5181 5182 disappearingChildren.add(v); 5183 } 5184 5185 /** 5186 * Cleanup a view when its animation is done. This may mean removing it from 5187 * the list of disappearing views. 5188 * 5189 * @param view The view whose animation has finished 5190 * @param animation The animation, cannot be null 5191 */ 5192 void finishAnimatingView(final View view, Animation animation) { 5193 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5194 if (disappearingChildren != null) { 5195 if (disappearingChildren.contains(view)) { 5196 disappearingChildren.remove(view); 5197 5198 if (view.mAttachInfo != null) { 5199 view.dispatchDetachedFromWindow(); 5200 } 5201 5202 view.clearAnimation(); 5203 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5204 } 5205 } 5206 5207 if (animation != null && !animation.getFillAfter()) { 5208 view.clearAnimation(); 5209 } 5210 5211 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5212 view.onAnimationEnd(); 5213 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5214 // so we'd rather be safe than sorry 5215 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5216 // Draw one more frame after the animation is done 5217 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5218 } 5219 } 5220 5221 /** 5222 * Utility function called by View during invalidation to determine whether a view that 5223 * is invisible or gone should still be invalidated because it is being transitioned (and 5224 * therefore still needs to be drawn). 5225 */ 5226 boolean isViewTransitioning(View view) { 5227 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5228 } 5229 5230 /** 5231 * This method tells the ViewGroup that the given View object, which should have this 5232 * ViewGroup as its parent, 5233 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5234 * is removed from its parent. This allows animations, such as those used by 5235 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5236 * the removal of views. A call to this method should always be accompanied by a later call 5237 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5238 * so that the View finally gets removed. 5239 * 5240 * @param view The View object to be kept visible even if it gets removed from its parent. 5241 */ 5242 public void startViewTransition(View view) { 5243 if (view.mParent == this) { 5244 if (mTransitioningViews == null) { 5245 mTransitioningViews = new ArrayList<View>(); 5246 } 5247 mTransitioningViews.add(view); 5248 } 5249 } 5250 5251 /** 5252 * This method should always be called following an earlier call to 5253 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5254 * and will no longer be displayed. Note that this method does not perform the functionality 5255 * of removing a view from its parent; it just discontinues the display of a View that 5256 * has previously been removed. 5257 * 5258 * @return view The View object that has been removed but is being kept around in the visible 5259 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5260 */ 5261 public void endViewTransition(View view) { 5262 if (mTransitioningViews != null) { 5263 mTransitioningViews.remove(view); 5264 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5265 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5266 disappearingChildren.remove(view); 5267 if (mVisibilityChangingChildren != null && 5268 mVisibilityChangingChildren.contains(view)) { 5269 mVisibilityChangingChildren.remove(view); 5270 } else { 5271 if (view.mAttachInfo != null) { 5272 view.dispatchDetachedFromWindow(); 5273 } 5274 if (view.mParent != null) { 5275 view.mParent = null; 5276 } 5277 } 5278 invalidate(); 5279 } 5280 } 5281 } 5282 5283 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5284 new LayoutTransition.TransitionListener() { 5285 @Override 5286 public void startTransition(LayoutTransition transition, ViewGroup container, 5287 View view, int transitionType) { 5288 // We only care about disappearing items, since we need special logic to keep 5289 // those items visible after they've been 'removed' 5290 if (transitionType == LayoutTransition.DISAPPEARING) { 5291 startViewTransition(view); 5292 } 5293 } 5294 5295 @Override 5296 public void endTransition(LayoutTransition transition, ViewGroup container, 5297 View view, int transitionType) { 5298 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5299 requestLayout(); 5300 mLayoutCalledWhileSuppressed = false; 5301 } 5302 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5303 endViewTransition(view); 5304 } 5305 } 5306 }; 5307 5308 /** 5309 * Tells this ViewGroup to suppress all layout() calls until layout 5310 * suppression is disabled with a later call to suppressLayout(false). 5311 * When layout suppression is disabled, a requestLayout() call is sent 5312 * if layout() was attempted while layout was being suppressed. 5313 * 5314 * @hide 5315 */ 5316 public void suppressLayout(boolean suppress) { 5317 mSuppressLayout = suppress; 5318 if (!suppress) { 5319 if (mLayoutCalledWhileSuppressed) { 5320 requestLayout(); 5321 mLayoutCalledWhileSuppressed = false; 5322 } 5323 } 5324 } 5325 5326 /** 5327 * {@inheritDoc} 5328 */ 5329 @Override 5330 public boolean gatherTransparentRegion(Region region) { 5331 // If no transparent regions requested, we are always opaque. 5332 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5333 if (meOpaque && region == null) { 5334 // The caller doesn't care about the region, so stop now. 5335 return true; 5336 } 5337 super.gatherTransparentRegion(region); 5338 final View[] children = mChildren; 5339 final int count = mChildrenCount; 5340 boolean noneOfTheChildrenAreTransparent = true; 5341 for (int i = 0; i < count; i++) { 5342 final View child = children[i]; 5343 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5344 if (!child.gatherTransparentRegion(region)) { 5345 noneOfTheChildrenAreTransparent = false; 5346 } 5347 } 5348 } 5349 return meOpaque || noneOfTheChildrenAreTransparent; 5350 } 5351 5352 /** 5353 * {@inheritDoc} 5354 */ 5355 public void requestTransparentRegion(View child) { 5356 if (child != null) { 5357 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5358 if (mParent != null) { 5359 mParent.requestTransparentRegion(this); 5360 } 5361 } 5362 } 5363 5364 5365 @Override 5366 protected boolean fitSystemWindows(Rect insets) { 5367 boolean done = super.fitSystemWindows(insets); 5368 if (!done) { 5369 final int count = mChildrenCount; 5370 final View[] children = mChildren; 5371 for (int i = 0; i < count; i++) { 5372 done = children[i].fitSystemWindows(insets); 5373 if (done) { 5374 break; 5375 } 5376 } 5377 } 5378 return done; 5379 } 5380 5381 /** 5382 * Returns the animation listener to which layout animation events are 5383 * sent. 5384 * 5385 * @return an {@link android.view.animation.Animation.AnimationListener} 5386 */ 5387 public Animation.AnimationListener getLayoutAnimationListener() { 5388 return mAnimationListener; 5389 } 5390 5391 @Override 5392 protected void drawableStateChanged() { 5393 super.drawableStateChanged(); 5394 5395 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5396 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5397 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5398 + " child has duplicateParentState set to true"); 5399 } 5400 5401 final View[] children = mChildren; 5402 final int count = mChildrenCount; 5403 5404 for (int i = 0; i < count; i++) { 5405 final View child = children[i]; 5406 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5407 child.refreshDrawableState(); 5408 } 5409 } 5410 } 5411 } 5412 5413 @Override 5414 public void jumpDrawablesToCurrentState() { 5415 super.jumpDrawablesToCurrentState(); 5416 final View[] children = mChildren; 5417 final int count = mChildrenCount; 5418 for (int i = 0; i < count; i++) { 5419 children[i].jumpDrawablesToCurrentState(); 5420 } 5421 } 5422 5423 @Override 5424 protected int[] onCreateDrawableState(int extraSpace) { 5425 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5426 return super.onCreateDrawableState(extraSpace); 5427 } 5428 5429 int need = 0; 5430 int n = getChildCount(); 5431 for (int i = 0; i < n; i++) { 5432 int[] childState = getChildAt(i).getDrawableState(); 5433 5434 if (childState != null) { 5435 need += childState.length; 5436 } 5437 } 5438 5439 int[] state = super.onCreateDrawableState(extraSpace + need); 5440 5441 for (int i = 0; i < n; i++) { 5442 int[] childState = getChildAt(i).getDrawableState(); 5443 5444 if (childState != null) { 5445 state = mergeDrawableStates(state, childState); 5446 } 5447 } 5448 5449 return state; 5450 } 5451 5452 /** 5453 * Sets whether this ViewGroup's drawable states also include 5454 * its children's drawable states. This is used, for example, to 5455 * make a group appear to be focused when its child EditText or button 5456 * is focused. 5457 */ 5458 public void setAddStatesFromChildren(boolean addsStates) { 5459 if (addsStates) { 5460 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5461 } else { 5462 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5463 } 5464 5465 refreshDrawableState(); 5466 } 5467 5468 /** 5469 * Returns whether this ViewGroup's drawable states also include 5470 * its children's drawable states. This is used, for example, to 5471 * make a group appear to be focused when its child EditText or button 5472 * is focused. 5473 */ 5474 public boolean addStatesFromChildren() { 5475 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5476 } 5477 5478 /** 5479 * If {@link #addStatesFromChildren} is true, refreshes this group's 5480 * drawable state (to include the states from its children). 5481 */ 5482 public void childDrawableStateChanged(View child) { 5483 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5484 refreshDrawableState(); 5485 } 5486 } 5487 5488 /** 5489 * Specifies the animation listener to which layout animation events must 5490 * be sent. Only 5491 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5492 * and 5493 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5494 * are invoked. 5495 * 5496 * @param animationListener the layout animation listener 5497 */ 5498 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5499 mAnimationListener = animationListener; 5500 } 5501 5502 /** 5503 * This method is called by LayoutTransition when there are 'changing' animations that need 5504 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5505 * starts all pending transitions prior to the drawing phase in the current traversal. 5506 * 5507 * @param transition The LayoutTransition to be started on the next traversal. 5508 * 5509 * @hide 5510 */ 5511 public void requestTransitionStart(LayoutTransition transition) { 5512 ViewRootImpl viewAncestor = getViewRootImpl(); 5513 if (viewAncestor != null) { 5514 viewAncestor.requestTransitionStart(transition); 5515 } 5516 } 5517 5518 /** 5519 * @hide 5520 */ 5521 @Override 5522 public void resolveRtlPropertiesIfNeeded() { 5523 super.resolveRtlPropertiesIfNeeded(); 5524 int count = getChildCount(); 5525 for (int i = 0; i < count; i++) { 5526 final View child = getChildAt(i); 5527 if (child.isLayoutDirectionInherited()) { 5528 child.resolveRtlPropertiesIfNeeded(); 5529 } 5530 } 5531 } 5532 5533 /** 5534 * @hide 5535 */ 5536 @Override 5537 public boolean resolveLayoutDirection() { 5538 final boolean result = super.resolveLayoutDirection(); 5539 if (result) { 5540 int count = getChildCount(); 5541 for (int i = 0; i < count; i++) { 5542 final View child = getChildAt(i); 5543 if (child.isLayoutDirectionInherited()) { 5544 child.resolveLayoutDirection(); 5545 } 5546 } 5547 } 5548 return result; 5549 } 5550 5551 /** 5552 * @hide 5553 */ 5554 @Override 5555 public boolean resolveTextDirection() { 5556 final boolean result = super.resolveTextDirection(); 5557 if (result) { 5558 int count = getChildCount(); 5559 for (int i = 0; i < count; i++) { 5560 final View child = getChildAt(i); 5561 if (child.isTextDirectionInherited()) { 5562 child.resolveTextDirection(); 5563 } 5564 } 5565 } 5566 return result; 5567 } 5568 5569 /** 5570 * @hide 5571 */ 5572 @Override 5573 public boolean resolveTextAlignment() { 5574 final boolean result = super.resolveTextAlignment(); 5575 if (result) { 5576 int count = getChildCount(); 5577 for (int i = 0; i < count; i++) { 5578 final View child = getChildAt(i); 5579 if (child.isTextAlignmentInherited()) { 5580 child.resolveTextAlignment(); 5581 } 5582 } 5583 } 5584 return result; 5585 } 5586 5587 /** 5588 * @hide 5589 */ 5590 @Override 5591 public void resolvePadding() { 5592 super.resolvePadding(); 5593 int count = getChildCount(); 5594 for (int i = 0; i < count; i++) { 5595 final View child = getChildAt(i); 5596 if (child.isLayoutDirectionInherited()) { 5597 child.resolvePadding(); 5598 } 5599 } 5600 } 5601 5602 /** 5603 * @hide 5604 */ 5605 @Override 5606 protected void resolveDrawables() { 5607 super.resolveDrawables(); 5608 int count = getChildCount(); 5609 for (int i = 0; i < count; i++) { 5610 final View child = getChildAt(i); 5611 if (child.isLayoutDirectionInherited()) { 5612 child.resolveDrawables(); 5613 } 5614 } 5615 } 5616 5617 /** 5618 * @hide 5619 */ 5620 @Override 5621 public void resolveLayoutParams() { 5622 super.resolveLayoutParams(); 5623 int count = getChildCount(); 5624 for (int i = 0; i < count; i++) { 5625 final View child = getChildAt(i); 5626 child.resolveLayoutParams(); 5627 } 5628 } 5629 5630 /** 5631 * @hide 5632 */ 5633 @Override 5634 public void resetResolvedLayoutDirection() { 5635 super.resetResolvedLayoutDirection(); 5636 5637 int count = getChildCount(); 5638 for (int i = 0; i < count; i++) { 5639 final View child = getChildAt(i); 5640 if (child.isLayoutDirectionInherited()) { 5641 child.resetResolvedLayoutDirection(); 5642 } 5643 } 5644 } 5645 5646 /** 5647 * @hide 5648 */ 5649 @Override 5650 public void resetResolvedTextDirection() { 5651 super.resetResolvedTextDirection(); 5652 5653 int count = getChildCount(); 5654 for (int i = 0; i < count; i++) { 5655 final View child = getChildAt(i); 5656 if (child.isTextDirectionInherited()) { 5657 child.resetResolvedTextDirection(); 5658 } 5659 } 5660 } 5661 5662 /** 5663 * @hide 5664 */ 5665 @Override 5666 public void resetResolvedTextAlignment() { 5667 super.resetResolvedTextAlignment(); 5668 5669 int count = getChildCount(); 5670 for (int i = 0; i < count; i++) { 5671 final View child = getChildAt(i); 5672 if (child.isTextAlignmentInherited()) { 5673 child.resetResolvedTextAlignment(); 5674 } 5675 } 5676 } 5677 5678 /** 5679 * @hide 5680 */ 5681 @Override 5682 public void resetResolvedPadding() { 5683 super.resetResolvedPadding(); 5684 5685 int count = getChildCount(); 5686 for (int i = 0; i < count; i++) { 5687 final View child = getChildAt(i); 5688 if (child.isLayoutDirectionInherited()) { 5689 child.resetResolvedPadding(); 5690 } 5691 } 5692 } 5693 5694 /** 5695 * @hide 5696 */ 5697 @Override 5698 protected void resetResolvedDrawables() { 5699 super.resetResolvedDrawables(); 5700 5701 int count = getChildCount(); 5702 for (int i = 0; i < count; i++) { 5703 final View child = getChildAt(i); 5704 if (child.isLayoutDirectionInherited()) { 5705 child.resetResolvedDrawables(); 5706 } 5707 } 5708 } 5709 5710 /** 5711 * Return true if the pressed state should be delayed for children or descendants of this 5712 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5713 * This prevents the pressed state from appearing when the user is actually trying to scroll 5714 * the content. 5715 * 5716 * The default implementation returns true for compatibility reasons. Subclasses that do 5717 * not scroll should generally override this method and return false. 5718 */ 5719 public boolean shouldDelayChildPressedState() { 5720 return true; 5721 } 5722 5723 /** @hide */ 5724 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5725 } 5726 5727 /** 5728 * LayoutParams are used by views to tell their parents how they want to be 5729 * laid out. See 5730 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5731 * for a list of all child view attributes that this class supports. 5732 * 5733 * <p> 5734 * The base LayoutParams class just describes how big the view wants to be 5735 * for both width and height. For each dimension, it can specify one of: 5736 * <ul> 5737 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5738 * means that the view wants to be as big as its parent (minus padding) 5739 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5740 * to enclose its content (plus padding) 5741 * <li> an exact number 5742 * </ul> 5743 * There are subclasses of LayoutParams for different subclasses of 5744 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5745 * LayoutParams which adds an X and Y value.</p> 5746 * 5747 * <div class="special reference"> 5748 * <h3>Developer Guides</h3> 5749 * <p>For more information about creating user interface layouts, read the 5750 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5751 * guide.</p></div> 5752 * 5753 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5754 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5755 */ 5756 public static class LayoutParams { 5757 /** 5758 * Special value for the height or width requested by a View. 5759 * FILL_PARENT means that the view wants to be as big as its parent, 5760 * minus the parent's padding, if any. This value is deprecated 5761 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5762 */ 5763 @SuppressWarnings({"UnusedDeclaration"}) 5764 @Deprecated 5765 public static final int FILL_PARENT = -1; 5766 5767 /** 5768 * Special value for the height or width requested by a View. 5769 * MATCH_PARENT means that the view wants to be as big as its parent, 5770 * minus the parent's padding, if any. Introduced in API Level 8. 5771 */ 5772 public static final int MATCH_PARENT = -1; 5773 5774 /** 5775 * Special value for the height or width requested by a View. 5776 * WRAP_CONTENT means that the view wants to be just large enough to fit 5777 * its own internal content, taking its own padding into account. 5778 */ 5779 public static final int WRAP_CONTENT = -2; 5780 5781 /** 5782 * Information about how wide the view wants to be. Can be one of the 5783 * constants FILL_PARENT (replaced by MATCH_PARENT , 5784 * in API Level 8) or WRAP_CONTENT. or an exact size. 5785 */ 5786 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5787 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5788 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5789 }) 5790 public int width; 5791 5792 /** 5793 * Information about how tall the view wants to be. Can be one of the 5794 * constants FILL_PARENT (replaced by MATCH_PARENT , 5795 * in API Level 8) or WRAP_CONTENT. or an exact size. 5796 */ 5797 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5798 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5799 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5800 }) 5801 public int height; 5802 5803 /** 5804 * Used to animate layouts. 5805 */ 5806 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5807 5808 /** 5809 * Creates a new set of layout parameters. The values are extracted from 5810 * the supplied attributes set and context. The XML attributes mapped 5811 * to this set of layout parameters are: 5812 * 5813 * <ul> 5814 * <li><code>layout_width</code>: the width, either an exact value, 5815 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5816 * {@link #MATCH_PARENT} in API Level 8)</li> 5817 * <li><code>layout_height</code>: the height, either an exact value, 5818 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5819 * {@link #MATCH_PARENT} in API Level 8)</li> 5820 * </ul> 5821 * 5822 * @param c the application environment 5823 * @param attrs the set of attributes from which to extract the layout 5824 * parameters' values 5825 */ 5826 public LayoutParams(Context c, AttributeSet attrs) { 5827 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5828 setBaseAttributes(a, 5829 R.styleable.ViewGroup_Layout_layout_width, 5830 R.styleable.ViewGroup_Layout_layout_height); 5831 a.recycle(); 5832 } 5833 5834 /** 5835 * Creates a new set of layout parameters with the specified width 5836 * and height. 5837 * 5838 * @param width the width, either {@link #WRAP_CONTENT}, 5839 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5840 * API Level 8), or a fixed size in pixels 5841 * @param height the height, either {@link #WRAP_CONTENT}, 5842 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5843 * API Level 8), or a fixed size in pixels 5844 */ 5845 public LayoutParams(int width, int height) { 5846 this.width = width; 5847 this.height = height; 5848 } 5849 5850 /** 5851 * Copy constructor. Clones the width and height values of the source. 5852 * 5853 * @param source The layout params to copy from. 5854 */ 5855 public LayoutParams(LayoutParams source) { 5856 this.width = source.width; 5857 this.height = source.height; 5858 } 5859 5860 /** 5861 * Used internally by MarginLayoutParams. 5862 * @hide 5863 */ 5864 LayoutParams() { 5865 } 5866 5867 /** 5868 * Extracts the layout parameters from the supplied attributes. 5869 * 5870 * @param a the style attributes to extract the parameters from 5871 * @param widthAttr the identifier of the width attribute 5872 * @param heightAttr the identifier of the height attribute 5873 */ 5874 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5875 width = a.getLayoutDimension(widthAttr, "layout_width"); 5876 height = a.getLayoutDimension(heightAttr, "layout_height"); 5877 } 5878 5879 /** 5880 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5881 * layoutDirection changes should override this method. The default implementation does 5882 * nothing. 5883 * 5884 * @param layoutDirection the direction of the layout 5885 * 5886 * {@link View#LAYOUT_DIRECTION_LTR} 5887 * {@link View#LAYOUT_DIRECTION_RTL} 5888 */ 5889 public void resolveLayoutDirection(int layoutDirection) { 5890 } 5891 5892 /** 5893 * Returns a String representation of this set of layout parameters. 5894 * 5895 * @param output the String to prepend to the internal representation 5896 * @return a String with the following format: output + 5897 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5898 * 5899 * @hide 5900 */ 5901 public String debug(String output) { 5902 return output + "ViewGroup.LayoutParams={ width=" 5903 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5904 } 5905 5906 /** 5907 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5908 * 5909 * @param view the view that contains these layout parameters 5910 * @param canvas the canvas on which to draw 5911 * 5912 * @hide 5913 */ 5914 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5915 } 5916 5917 /** 5918 * Converts the specified size to a readable String. 5919 * 5920 * @param size the size to convert 5921 * @return a String instance representing the supplied size 5922 * 5923 * @hide 5924 */ 5925 protected static String sizeToString(int size) { 5926 if (size == WRAP_CONTENT) { 5927 return "wrap-content"; 5928 } 5929 if (size == MATCH_PARENT) { 5930 return "match-parent"; 5931 } 5932 return String.valueOf(size); 5933 } 5934 } 5935 5936 /** 5937 * Per-child layout information for layouts that support margins. 5938 * See 5939 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5940 * for a list of all child view attributes that this class supports. 5941 */ 5942 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5943 /** 5944 * The left margin in pixels of the child. 5945 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5946 * to this field. 5947 */ 5948 @ViewDebug.ExportedProperty(category = "layout") 5949 public int leftMargin; 5950 5951 /** 5952 * The top margin in pixels of the child. 5953 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5954 * to this field. 5955 */ 5956 @ViewDebug.ExportedProperty(category = "layout") 5957 public int topMargin; 5958 5959 /** 5960 * The right margin in pixels of the child. 5961 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5962 * to this field. 5963 */ 5964 @ViewDebug.ExportedProperty(category = "layout") 5965 public int rightMargin; 5966 5967 /** 5968 * The bottom margin in pixels of the child. 5969 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5970 * to this field. 5971 */ 5972 @ViewDebug.ExportedProperty(category = "layout") 5973 public int bottomMargin; 5974 5975 /** 5976 * The start margin in pixels of the child. 5977 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5978 * to this field. 5979 */ 5980 @ViewDebug.ExportedProperty(category = "layout") 5981 private int startMargin = DEFAULT_MARGIN_RELATIVE; 5982 5983 /** 5984 * The end margin in pixels of the child. 5985 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5986 * to this field. 5987 */ 5988 @ViewDebug.ExportedProperty(category = "layout") 5989 private int endMargin = DEFAULT_MARGIN_RELATIVE; 5990 5991 /** 5992 * The default start and end margin. 5993 * @hide 5994 */ 5995 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 5996 5997 /** 5998 * Bit 0: layout direction 5999 * Bit 1: layout direction 6000 * Bit 2: left margin undefined 6001 * Bit 3: right margin undefined 6002 * Bit 4: is RTL compatibility mode 6003 * Bit 5: need resolution 6004 * 6005 * Bit 6 to 7 not used 6006 * 6007 * @hide 6008 */ 6009 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6010 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6011 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6012 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6013 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6014 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6015 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6016 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6017 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6018 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6019 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6020 }) 6021 byte mMarginFlags; 6022 6023 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6024 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6025 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6026 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6027 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6028 6029 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6030 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6031 6032 /** 6033 * Creates a new set of layout parameters. The values are extracted from 6034 * the supplied attributes set and context. 6035 * 6036 * @param c the application environment 6037 * @param attrs the set of attributes from which to extract the layout 6038 * parameters' values 6039 */ 6040 public MarginLayoutParams(Context c, AttributeSet attrs) { 6041 super(); 6042 6043 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6044 setBaseAttributes(a, 6045 R.styleable.ViewGroup_MarginLayout_layout_width, 6046 R.styleable.ViewGroup_MarginLayout_layout_height); 6047 6048 int margin = a.getDimensionPixelSize( 6049 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6050 if (margin >= 0) { 6051 leftMargin = margin; 6052 topMargin = margin; 6053 rightMargin= margin; 6054 bottomMargin = margin; 6055 } else { 6056 leftMargin = a.getDimensionPixelSize( 6057 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6058 UNDEFINED_MARGIN); 6059 if (leftMargin == UNDEFINED_MARGIN) { 6060 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6061 leftMargin = DEFAULT_MARGIN_RESOLVED; 6062 } 6063 rightMargin = a.getDimensionPixelSize( 6064 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6065 UNDEFINED_MARGIN); 6066 if (rightMargin == UNDEFINED_MARGIN) { 6067 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6068 rightMargin = DEFAULT_MARGIN_RESOLVED; 6069 } 6070 6071 topMargin = a.getDimensionPixelSize( 6072 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6073 DEFAULT_MARGIN_RESOLVED); 6074 bottomMargin = a.getDimensionPixelSize( 6075 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6076 DEFAULT_MARGIN_RESOLVED); 6077 6078 startMargin = a.getDimensionPixelSize( 6079 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6080 DEFAULT_MARGIN_RELATIVE); 6081 endMargin = a.getDimensionPixelSize( 6082 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6083 DEFAULT_MARGIN_RELATIVE); 6084 6085 if (isMarginRelative()) { 6086 mMarginFlags |= NEED_RESOLUTION_MASK; 6087 } 6088 } 6089 6090 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6091 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6092 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6093 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6094 } 6095 6096 // Layout direction is LTR by default 6097 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6098 6099 a.recycle(); 6100 } 6101 6102 /** 6103 * {@inheritDoc} 6104 */ 6105 public MarginLayoutParams(int width, int height) { 6106 super(width, height); 6107 6108 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6109 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6110 6111 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6112 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6113 } 6114 6115 /** 6116 * Copy constructor. Clones the width, height and margin values of the source. 6117 * 6118 * @param source The layout params to copy from. 6119 */ 6120 public MarginLayoutParams(MarginLayoutParams source) { 6121 this.width = source.width; 6122 this.height = source.height; 6123 6124 this.leftMargin = source.leftMargin; 6125 this.topMargin = source.topMargin; 6126 this.rightMargin = source.rightMargin; 6127 this.bottomMargin = source.bottomMargin; 6128 this.startMargin = source.startMargin; 6129 this.endMargin = source.endMargin; 6130 6131 this.mMarginFlags = source.mMarginFlags; 6132 } 6133 6134 /** 6135 * {@inheritDoc} 6136 */ 6137 public MarginLayoutParams(LayoutParams source) { 6138 super(source); 6139 6140 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6141 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6142 6143 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6144 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6145 } 6146 6147 /** 6148 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6149 * to be done so that the new margins are taken into account. Left and right margins may be 6150 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6151 * 6152 * @param left the left margin size 6153 * @param top the top margin size 6154 * @param right the right margin size 6155 * @param bottom the bottom margin size 6156 * 6157 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6158 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6159 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6160 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6161 */ 6162 public void setMargins(int left, int top, int right, int bottom) { 6163 leftMargin = left; 6164 topMargin = top; 6165 rightMargin = right; 6166 bottomMargin = bottom; 6167 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6168 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6169 if (isMarginRelative()) { 6170 mMarginFlags |= NEED_RESOLUTION_MASK; 6171 } else { 6172 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6173 } 6174 } 6175 6176 /** 6177 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6178 * needs to be done so that the new relative margins are taken into account. Left and right 6179 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6180 * direction. 6181 * 6182 * @param start the start margin size 6183 * @param top the top margin size 6184 * @param end the right margin size 6185 * @param bottom the bottom margin size 6186 * 6187 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6188 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6189 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6190 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6191 * 6192 * @hide 6193 */ 6194 public void setMarginsRelative(int start, int top, int end, int bottom) { 6195 startMargin = start; 6196 topMargin = top; 6197 endMargin = end; 6198 bottomMargin = bottom; 6199 mMarginFlags |= NEED_RESOLUTION_MASK; 6200 } 6201 6202 /** 6203 * Sets the relative start margin. 6204 * 6205 * @param start the start margin size 6206 * 6207 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6208 */ 6209 public void setMarginStart(int start) { 6210 startMargin = start; 6211 mMarginFlags |= NEED_RESOLUTION_MASK; 6212 } 6213 6214 /** 6215 * Returns the start margin in pixels. 6216 * 6217 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6218 * 6219 * @return the start margin in pixels. 6220 */ 6221 public int getMarginStart() { 6222 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6223 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6224 doResolveMargins(); 6225 } 6226 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6227 case View.LAYOUT_DIRECTION_RTL: 6228 return rightMargin; 6229 case View.LAYOUT_DIRECTION_LTR: 6230 default: 6231 return leftMargin; 6232 } 6233 } 6234 6235 /** 6236 * Sets the relative end margin. 6237 * 6238 * @param end the end margin size 6239 * 6240 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6241 */ 6242 public void setMarginEnd(int end) { 6243 endMargin = end; 6244 mMarginFlags |= NEED_RESOLUTION_MASK; 6245 } 6246 6247 /** 6248 * Returns the end margin in pixels. 6249 * 6250 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6251 * 6252 * @return the end margin in pixels. 6253 */ 6254 public int getMarginEnd() { 6255 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6256 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6257 doResolveMargins(); 6258 } 6259 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6260 case View.LAYOUT_DIRECTION_RTL: 6261 return leftMargin; 6262 case View.LAYOUT_DIRECTION_LTR: 6263 default: 6264 return rightMargin; 6265 } 6266 } 6267 6268 /** 6269 * Check if margins are relative. 6270 * 6271 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6272 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6273 * 6274 * @return true if either marginStart or marginEnd has been set. 6275 */ 6276 public boolean isMarginRelative() { 6277 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6278 } 6279 6280 /** 6281 * Set the layout direction 6282 * @param layoutDirection the layout direction. 6283 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6284 * or {@link View#LAYOUT_DIRECTION_RTL}. 6285 */ 6286 public void setLayoutDirection(int layoutDirection) { 6287 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6288 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6289 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6290 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6291 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6292 if (isMarginRelative()) { 6293 mMarginFlags |= NEED_RESOLUTION_MASK; 6294 } else { 6295 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6296 } 6297 } 6298 } 6299 6300 /** 6301 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6302 * {@link View#LAYOUT_DIRECTION_RTL}. 6303 * 6304 * @return the layout direction. 6305 */ 6306 public int getLayoutDirection() { 6307 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6308 } 6309 6310 /** 6311 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6312 * may be overridden depending on layout direction. 6313 */ 6314 @Override 6315 public void resolveLayoutDirection(int layoutDirection) { 6316 setLayoutDirection(layoutDirection); 6317 6318 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6319 // Will use the left and right margins if no relative margin is defined. 6320 if (!isMarginRelative() || 6321 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6322 6323 // Proceed with resolution 6324 doResolveMargins(); 6325 } 6326 6327 private void doResolveMargins() { 6328 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 6329 // if left or right margins are not defined and if we have some start or end margin 6330 // defined then use those start and end margins. 6331 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 6332 && startMargin > DEFAULT_MARGIN_RELATIVE) { 6333 leftMargin = startMargin; 6334 } 6335 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 6336 && endMargin > DEFAULT_MARGIN_RELATIVE) { 6337 rightMargin = endMargin; 6338 } 6339 } else { 6340 // We have some relative margins (either the start one or the end one or both). So use 6341 // them and override what has been defined for left and right margins. If either start 6342 // or end margin is not defined, just set it to default "0". 6343 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6344 case View.LAYOUT_DIRECTION_RTL: 6345 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6346 endMargin : DEFAULT_MARGIN_RESOLVED; 6347 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6348 startMargin : DEFAULT_MARGIN_RESOLVED; 6349 break; 6350 case View.LAYOUT_DIRECTION_LTR: 6351 default: 6352 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6353 startMargin : DEFAULT_MARGIN_RESOLVED; 6354 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6355 endMargin : DEFAULT_MARGIN_RESOLVED; 6356 break; 6357 } 6358 } 6359 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6360 } 6361 6362 /** 6363 * @hide 6364 */ 6365 public boolean isLayoutRtl() { 6366 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 6367 } 6368 6369 /** 6370 * @hide 6371 */ 6372 @Override 6373 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6374 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6375 6376 fillDifference(canvas, 6377 view.getLeft() + oi.left, 6378 view.getTop() + oi.top, 6379 view.getRight() - oi.right, 6380 view.getBottom() - oi.bottom, 6381 leftMargin, 6382 topMargin, 6383 rightMargin, 6384 bottomMargin, 6385 paint); 6386 } 6387 } 6388 6389 /* Describes a touched view and the ids of the pointers that it has captured. 6390 * 6391 * This code assumes that pointer ids are always in the range 0..31 such that 6392 * it can use a bitfield to track which pointer ids are present. 6393 * As it happens, the lower layers of the input dispatch pipeline also use the 6394 * same trick so the assumption should be safe here... 6395 */ 6396 private static final class TouchTarget { 6397 private static final int MAX_RECYCLED = 32; 6398 private static final Object sRecycleLock = new Object(); 6399 private static TouchTarget sRecycleBin; 6400 private static int sRecycledCount; 6401 6402 public static final int ALL_POINTER_IDS = -1; // all ones 6403 6404 // The touched child view. 6405 public View child; 6406 6407 // The combined bit mask of pointer ids for all pointers captured by the target. 6408 public int pointerIdBits; 6409 6410 // The next target in the target list. 6411 public TouchTarget next; 6412 6413 private TouchTarget() { 6414 } 6415 6416 public static TouchTarget obtain(View child, int pointerIdBits) { 6417 final TouchTarget target; 6418 synchronized (sRecycleLock) { 6419 if (sRecycleBin == null) { 6420 target = new TouchTarget(); 6421 } else { 6422 target = sRecycleBin; 6423 sRecycleBin = target.next; 6424 sRecycledCount--; 6425 target.next = null; 6426 } 6427 } 6428 target.child = child; 6429 target.pointerIdBits = pointerIdBits; 6430 return target; 6431 } 6432 6433 public void recycle() { 6434 synchronized (sRecycleLock) { 6435 if (sRecycledCount < MAX_RECYCLED) { 6436 next = sRecycleBin; 6437 sRecycleBin = this; 6438 sRecycledCount += 1; 6439 } else { 6440 next = null; 6441 } 6442 child = null; 6443 } 6444 } 6445 } 6446 6447 /* Describes a hovered view. */ 6448 private static final class HoverTarget { 6449 private static final int MAX_RECYCLED = 32; 6450 private static final Object sRecycleLock = new Object(); 6451 private static HoverTarget sRecycleBin; 6452 private static int sRecycledCount; 6453 6454 // The hovered child view. 6455 public View child; 6456 6457 // The next target in the target list. 6458 public HoverTarget next; 6459 6460 private HoverTarget() { 6461 } 6462 6463 public static HoverTarget obtain(View child) { 6464 final HoverTarget target; 6465 synchronized (sRecycleLock) { 6466 if (sRecycleBin == null) { 6467 target = new HoverTarget(); 6468 } else { 6469 target = sRecycleBin; 6470 sRecycleBin = target.next; 6471 sRecycledCount--; 6472 target.next = null; 6473 } 6474 } 6475 target.child = child; 6476 return target; 6477 } 6478 6479 public void recycle() { 6480 synchronized (sRecycleLock) { 6481 if (sRecycledCount < MAX_RECYCLED) { 6482 next = sRecycleBin; 6483 sRecycleBin = this; 6484 sRecycledCount += 1; 6485 } else { 6486 next = null; 6487 } 6488 child = null; 6489 } 6490 } 6491 } 6492 6493 /** 6494 * Pooled class that orderes the children of a ViewGroup from start 6495 * to end based on how they are laid out and the layout direction. 6496 */ 6497 static class ChildListForAccessibility { 6498 6499 private static final int MAX_POOL_SIZE = 32; 6500 6501 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6502 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6503 6504 private final ArrayList<View> mChildren = new ArrayList<View>(); 6505 6506 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6507 6508 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6509 ChildListForAccessibility list = sPool.acquire(); 6510 if (list == null) { 6511 list = new ChildListForAccessibility(); 6512 } 6513 list.init(parent, sort); 6514 return list; 6515 } 6516 6517 public void recycle() { 6518 clear(); 6519 sPool.release(this); 6520 } 6521 6522 public int getChildCount() { 6523 return mChildren.size(); 6524 } 6525 6526 public View getChildAt(int index) { 6527 return mChildren.get(index); 6528 } 6529 6530 public int getChildIndex(View child) { 6531 return mChildren.indexOf(child); 6532 } 6533 6534 private void init(ViewGroup parent, boolean sort) { 6535 ArrayList<View> children = mChildren; 6536 final int childCount = parent.getChildCount(); 6537 for (int i = 0; i < childCount; i++) { 6538 View child = parent.getChildAt(i); 6539 children.add(child); 6540 } 6541 if (sort) { 6542 ArrayList<ViewLocationHolder> holders = mHolders; 6543 for (int i = 0; i < childCount; i++) { 6544 View child = children.get(i); 6545 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6546 holders.add(holder); 6547 } 6548 Collections.sort(holders); 6549 for (int i = 0; i < childCount; i++) { 6550 ViewLocationHolder holder = holders.get(i); 6551 children.set(i, holder.mView); 6552 holder.recycle(); 6553 } 6554 holders.clear(); 6555 } 6556 } 6557 6558 private void clear() { 6559 mChildren.clear(); 6560 } 6561 } 6562 6563 /** 6564 * Pooled class that holds a View and its location with respect to 6565 * a specified root. This enables sorting of views based on their 6566 * coordinates without recomputing the position relative to the root 6567 * on every comparison. 6568 */ 6569 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6570 6571 private static final int MAX_POOL_SIZE = 32; 6572 6573 private static final SynchronizedPool<ViewLocationHolder> sPool = 6574 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6575 6576 private final Rect mLocation = new Rect(); 6577 6578 public View mView; 6579 6580 private int mLayoutDirection; 6581 6582 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6583 ViewLocationHolder holder = sPool.acquire(); 6584 if (holder == null) { 6585 holder = new ViewLocationHolder(); 6586 } 6587 holder.init(root, view); 6588 return holder; 6589 } 6590 6591 public void recycle() { 6592 clear(); 6593 sPool.release(this); 6594 } 6595 6596 @Override 6597 public int compareTo(ViewLocationHolder another) { 6598 // This instance is greater than an invalid argument. 6599 if (another == null) { 6600 return 1; 6601 } 6602 if (getClass() != another.getClass()) { 6603 return 1; 6604 } 6605 // First is above second. 6606 if (mLocation.bottom - another.mLocation.top <= 0) { 6607 return -1; 6608 } 6609 // First is below second. 6610 if (mLocation.top - another.mLocation.bottom >= 0) { 6611 return 1; 6612 } 6613 // LTR 6614 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6615 final int leftDifference = mLocation.left - another.mLocation.left; 6616 // First more to the left than second. 6617 if (leftDifference != 0) { 6618 return leftDifference; 6619 } 6620 } else { // RTL 6621 final int rightDifference = mLocation.right - another.mLocation.right; 6622 // First more to the right than second. 6623 if (rightDifference != 0) { 6624 return -rightDifference; 6625 } 6626 } 6627 // Break tie by top. 6628 final int topDiference = mLocation.top - another.mLocation.top; 6629 if (topDiference != 0) { 6630 return topDiference; 6631 } 6632 // Break tie by height. 6633 final int heightDiference = mLocation.height() - another.mLocation.height(); 6634 if (heightDiference != 0) { 6635 return -heightDiference; 6636 } 6637 // Break tie by width. 6638 final int widthDiference = mLocation.width() - another.mLocation.width(); 6639 if (widthDiference != 0) { 6640 return -widthDiference; 6641 } 6642 // Just break the tie somehow. The accessibliity ids are unique 6643 // and stable, hence this is deterministic tie breaking. 6644 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6645 } 6646 6647 private void init(ViewGroup root, View view) { 6648 Rect viewLocation = mLocation; 6649 view.getDrawingRect(viewLocation); 6650 root.offsetDescendantRectToMyCoords(view, viewLocation); 6651 mView = view; 6652 mLayoutDirection = root.getLayoutDirection(); 6653 } 6654 6655 private void clear() { 6656 mView = null; 6657 mLocation.set(0, 0, 0, 0); 6658 } 6659 } 6660 6661 private static Paint getDebugPaint() { 6662 if (sDebugPaint == null) { 6663 sDebugPaint = new Paint(); 6664 sDebugPaint.setAntiAlias(false); 6665 } 6666 return sDebugPaint; 6667 } 6668 6669 private void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6670 if (sDebugLines== null) { 6671 sDebugLines = new float[16]; 6672 } 6673 6674 sDebugLines[0] = x1; 6675 sDebugLines[1] = y1; 6676 sDebugLines[2] = x2; 6677 sDebugLines[3] = y1; 6678 6679 sDebugLines[4] = x2; 6680 sDebugLines[5] = y1; 6681 sDebugLines[6] = x2; 6682 sDebugLines[7] = y2; 6683 6684 sDebugLines[8] = x2; 6685 sDebugLines[9] = y2; 6686 sDebugLines[10] = x1; 6687 sDebugLines[11] = y2; 6688 6689 sDebugLines[12] = x1; 6690 sDebugLines[13] = y2; 6691 sDebugLines[14] = x1; 6692 sDebugLines[15] = y1; 6693 6694 canvas.drawLines(sDebugLines, paint); 6695 } 6696} 6697