ViewGroup.java revision 002d43d29b84e8a4e55c995a350783e80132d61a
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.pm.PackageManager; 22import android.content.res.Configuration; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Canvas; 26import android.graphics.Color; 27import android.graphics.Insets; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Build; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.Pools.SynchronizedPool; 40import android.util.SparseArray; 41import android.view.accessibility.AccessibilityEvent; 42import android.view.accessibility.AccessibilityNodeInfo; 43import android.view.animation.Animation; 44import android.view.animation.AnimationUtils; 45import android.view.animation.LayoutAnimationController; 46import android.view.animation.Transformation; 47 48import com.android.internal.R; 49import com.android.internal.util.Predicate; 50 51import java.util.ArrayList; 52import java.util.Collections; 53import java.util.HashSet; 54import java.util.Iterator; 55import java.util.List; 56import java.util.Map; 57import java.util.NoSuchElementException; 58 59import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 60 61/** 62 * <p> 63 * A <code>ViewGroup</code> is a special view that can contain other views 64 * (called children.) The view group is the base class for layouts and views 65 * containers. This class also defines the 66 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 67 * class for layouts parameters. 68 * </p> 69 * 70 * <p> 71 * Also see {@link LayoutParams} for layout attributes. 72 * </p> 73 * 74 * <div class="special reference"> 75 * <h3>Developer Guides</h3> 76 * <p>For more information about creating user interface layouts, read the 77 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 78 * guide.</p></div> 79 * 80 * <p>Here is a complete implementation of a custom ViewGroup that implements 81 * a simple {@link android.widget.FrameLayout} along with the ability to stack 82 * children in left and right gutters.</p> 83 * 84 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 85 * Complete} 86 * 87 * <p>If you are implementing XML layout attributes as shown in the example, this is the 88 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 89 * 90 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 91 * 92 * <p>Finally the layout manager can be used in an XML layout like so:</p> 93 * 94 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 95 * 96 * @attr ref android.R.styleable#ViewGroup_clipChildren 97 * @attr ref android.R.styleable#ViewGroup_clipToPadding 98 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 99 * @attr ref android.R.styleable#ViewGroup_animationCache 100 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 101 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 102 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 103 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 104 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 105 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 106 * @attr ref android.R.styleable#ViewGroup_layoutMode 107 */ 108public abstract class ViewGroup extends View implements ViewParent, ViewManager { 109 private static final String TAG = "ViewGroup"; 110 111 private static final boolean DBG = false; 112 /** @hide */ 113 public static boolean DEBUG_DRAW = false; 114 115 /** 116 * Views which have been hidden or removed which need to be animated on 117 * their way out. 118 * This field should be made private, so it is hidden from the SDK. 119 * {@hide} 120 */ 121 protected ArrayList<View> mDisappearingChildren; 122 123 /** 124 * Listener used to propagate events indicating when children are added 125 * and/or removed from a view group. 126 * This field should be made private, so it is hidden from the SDK. 127 * {@hide} 128 */ 129 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 130 131 // The view contained within this ViewGroup that has or contains focus. 132 private View mFocused; 133 134 /** 135 * A Transformation used when drawing children, to 136 * apply on the child being drawn. 137 */ 138 private Transformation mChildTransformation; 139 140 /** 141 * Used to track the current invalidation region. 142 */ 143 RectF mInvalidateRegion; 144 145 /** 146 * A Transformation used to calculate a correct 147 * invalidation area when the application is autoscaled. 148 */ 149 Transformation mInvalidationTransformation; 150 151 // View currently under an ongoing drag 152 private View mCurrentDragView; 153 154 // Metadata about the ongoing drag 155 private DragEvent mCurrentDrag; 156 private HashSet<View> mDragNotifiedChildren; 157 158 // Does this group have a child that can accept the current drag payload? 159 private boolean mChildAcceptsDrag; 160 161 // Used during drag dispatch 162 private PointF mLocalPoint; 163 164 // Layout animation 165 private LayoutAnimationController mLayoutAnimationController; 166 private Animation.AnimationListener mAnimationListener; 167 168 // First touch target in the linked list of touch targets. 169 private TouchTarget mFirstTouchTarget; 170 171 // For debugging only. You can see these in hierarchyviewer. 172 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 173 @ViewDebug.ExportedProperty(category = "events") 174 private long mLastTouchDownTime; 175 @ViewDebug.ExportedProperty(category = "events") 176 private int mLastTouchDownIndex = -1; 177 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 178 @ViewDebug.ExportedProperty(category = "events") 179 private float mLastTouchDownX; 180 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 181 @ViewDebug.ExportedProperty(category = "events") 182 private float mLastTouchDownY; 183 184 // First hover target in the linked list of hover targets. 185 // The hover targets are children which have received ACTION_HOVER_ENTER. 186 // They might not have actually handled the hover event, but we will 187 // continue sending hover events to them as long as the pointer remains over 188 // their bounds and the view group does not intercept hover. 189 private HoverTarget mFirstHoverTarget; 190 191 // True if the view group itself received a hover event. 192 // It might not have actually handled the hover event. 193 private boolean mHoveredSelf; 194 195 /** 196 * Internal flags. 197 * 198 * This field should be made private, so it is hidden from the SDK. 199 * {@hide} 200 */ 201 @ViewDebug.ExportedProperty(flagMapping = { 202 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 203 name = "CLIP_CHILDREN"), 204 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 205 name = "CLIP_TO_PADDING"), 206 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 207 name = "PADDING_NOT_NULL") 208 }, formatToHexString = true) 209 protected int mGroupFlags; 210 211 /** 212 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 213 */ 214 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 215 216 /** 217 * NOTE: If you change the flags below make sure to reflect the changes 218 * the DisplayList class 219 */ 220 221 // When set, ViewGroup invalidates only the child's rectangle 222 // Set by default 223 static final int FLAG_CLIP_CHILDREN = 0x1; 224 225 // When set, ViewGroup excludes the padding area from the invalidate rectangle 226 // Set by default 227 private static final int FLAG_CLIP_TO_PADDING = 0x2; 228 229 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 230 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 231 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 232 233 // When set, dispatchDraw() will run the layout animation and unset the flag 234 private static final int FLAG_RUN_ANIMATION = 0x8; 235 236 // When set, there is either no layout animation on the ViewGroup or the layout 237 // animation is over 238 // Set by default 239 static final int FLAG_ANIMATION_DONE = 0x10; 240 241 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 242 // to clip it, even if FLAG_CLIP_TO_PADDING is set 243 private static final int FLAG_PADDING_NOT_NULL = 0x20; 244 245 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 246 // Set by default 247 private static final int FLAG_ANIMATION_CACHE = 0x40; 248 249 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 250 // layout animation; this avoid clobbering the hierarchy 251 // Automatically set when the layout animation starts, depending on the animation's 252 // characteristics 253 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 254 255 // When set, the next call to drawChild() will clear mChildTransformation's matrix 256 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 257 258 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 259 // the children's Bitmap caches if necessary 260 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 261 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 262 263 /** 264 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 265 * to get the index of the child to draw for that iteration. 266 * 267 * @hide 268 */ 269 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 270 271 /** 272 * When set, this ViewGroup supports static transformations on children; this causes 273 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 274 * invoked when a child is drawn. 275 * 276 * Any subclass overriding 277 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 278 * set this flags in {@link #mGroupFlags}. 279 * 280 * {@hide} 281 */ 282 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 283 284 // UNUSED FLAG VALUE: 0x1000; 285 286 /** 287 * When set, this ViewGroup's drawable states also include those 288 * of its children. 289 */ 290 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 291 292 /** 293 * When set, this ViewGroup tries to always draw its children using their drawing cache. 294 */ 295 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 296 297 /** 298 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 299 * draw its children with their drawing cache. 300 */ 301 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 302 303 /** 304 * When set, this group will go through its list of children to notify them of 305 * any drawable state change. 306 */ 307 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 308 309 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 310 311 /** 312 * This view will get focus before any of its descendants. 313 */ 314 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 315 316 /** 317 * This view will get focus only if none of its descendants want it. 318 */ 319 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 320 321 /** 322 * This view will block any of its descendants from getting focus, even 323 * if they are focusable. 324 */ 325 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 326 327 /** 328 * Used to map between enum in attrubutes and flag values. 329 */ 330 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 331 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 332 FOCUS_BLOCK_DESCENDANTS}; 333 334 /** 335 * When set, this ViewGroup should not intercept touch events. 336 * {@hide} 337 */ 338 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 339 340 /** 341 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 342 */ 343 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 344 345 /** 346 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 347 * to children when adding new views. This is used to prevent multiple 348 * onAttached calls when a ViewGroup adds children in its own onAttached method. 349 */ 350 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 351 352 /** 353 * When true, indicates that a layoutMode has been explicitly set, either with 354 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 355 * This distinguishes the situation in which a layout mode was inherited from 356 * one of the ViewGroup's ancestors and cached locally. 357 */ 358 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 359 360 static final int FLAG_IS_TRANSITION_GROUP = 0x1000000; 361 362 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000; 363 364 /** 365 * When set, focus will not be permitted to enter this group if a touchscreen is present. 366 */ 367 static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000; 368 369 /** 370 * Indicates which types of drawing caches are to be kept in memory. 371 * This field should be made private, so it is hidden from the SDK. 372 * {@hide} 373 */ 374 protected int mPersistentDrawingCache; 375 376 /** 377 * Used to indicate that no drawing cache should be kept in memory. 378 */ 379 public static final int PERSISTENT_NO_CACHE = 0x0; 380 381 /** 382 * Used to indicate that the animation drawing cache should be kept in memory. 383 */ 384 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 385 386 /** 387 * Used to indicate that the scrolling drawing cache should be kept in memory. 388 */ 389 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 390 391 /** 392 * Used to indicate that all drawing caches should be kept in memory. 393 */ 394 public static final int PERSISTENT_ALL_CACHES = 0x3; 395 396 // Layout Modes 397 398 private static final int LAYOUT_MODE_UNDEFINED = -1; 399 400 /** 401 * This constant is a {@link #setLayoutMode(int) layoutMode}. 402 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 403 * {@link #getRight() right} and {@link #getBottom() bottom}. 404 */ 405 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 406 407 /** 408 * This constant is a {@link #setLayoutMode(int) layoutMode}. 409 * Optical bounds describe where a widget appears to be. They sit inside the clip 410 * bounds which need to cover a larger area to allow other effects, 411 * such as shadows and glows, to be drawn. 412 */ 413 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 414 415 /** @hide */ 416 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 417 418 /** 419 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 420 * are set at the same time. 421 */ 422 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 423 424 // Index of the child's left position in the mLocation array 425 private static final int CHILD_LEFT_INDEX = 0; 426 // Index of the child's top position in the mLocation array 427 private static final int CHILD_TOP_INDEX = 1; 428 429 // Child views of this ViewGroup 430 private View[] mChildren; 431 // Number of valid children in the mChildren array, the rest should be null or not 432 // considered as children 433 private int mChildrenCount; 434 435 // Whether layout calls are currently being suppressed, controlled by calls to 436 // suppressLayout() 437 boolean mSuppressLayout = false; 438 439 // Whether any layout calls have actually been suppressed while mSuppressLayout 440 // has been true. This tracks whether we need to issue a requestLayout() when 441 // layout is later re-enabled. 442 private boolean mLayoutCalledWhileSuppressed = false; 443 444 private static final int ARRAY_INITIAL_CAPACITY = 12; 445 private static final int ARRAY_CAPACITY_INCREMENT = 12; 446 447 private static Paint sDebugPaint; 448 private static float[] sDebugLines; 449 450 // Used to draw cached views 451 Paint mCachePaint; 452 453 // Used to animate add/remove changes in layout 454 private LayoutTransition mTransition; 455 456 // The set of views that are currently being transitioned. This list is used to track views 457 // being removed that should not actually be removed from the parent yet because they are 458 // being animated. 459 private ArrayList<View> mTransitioningViews; 460 461 // List of children changing visibility. This is used to potentially keep rendering 462 // views during a transition when they otherwise would have become gone/invisible 463 private ArrayList<View> mVisibilityChangingChildren; 464 465 // Temporary holder of presorted children, only used for 466 // input/software draw dispatch for correctly Z ordering. 467 private ArrayList<View> mPreSortedChildren; 468 469 // Indicates how many of this container's child subtrees contain transient state 470 @ViewDebug.ExportedProperty(category = "layout") 471 private int mChildCountWithTransientState = 0; 472 473 // Iterator over the children in decreasing Z order (top children first). 474 private OrderedChildIterator mOrderedChildIterator; 475 476 /** 477 * Currently registered axes for nested scrolling. Flag set consisting of 478 * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE} 479 * for null. 480 */ 481 private int mNestedScrollAxes; 482 483 public ViewGroup(Context context) { 484 this(context, null); 485 } 486 487 public ViewGroup(Context context, AttributeSet attrs) { 488 this(context, attrs, 0); 489 } 490 491 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 492 this(context, attrs, defStyleAttr, 0); 493 } 494 495 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 496 super(context, attrs, defStyleAttr, defStyleRes); 497 initViewGroup(); 498 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 499 } 500 501 private boolean debugDraw() { 502 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 503 } 504 505 private void initViewGroup() { 506 // ViewGroup doesn't draw by default 507 if (!debugDraw()) { 508 setFlags(WILL_NOT_DRAW, DRAW_MASK); 509 } 510 mGroupFlags |= FLAG_CLIP_CHILDREN; 511 mGroupFlags |= FLAG_CLIP_TO_PADDING; 512 mGroupFlags |= FLAG_ANIMATION_DONE; 513 mGroupFlags |= FLAG_ANIMATION_CACHE; 514 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 515 516 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 517 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 518 } 519 520 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 521 522 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 523 mChildrenCount = 0; 524 525 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 526 } 527 528 private void initFromAttributes( 529 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 530 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr, 531 defStyleRes); 532 533 final int N = a.getIndexCount(); 534 for (int i = 0; i < N; i++) { 535 int attr = a.getIndex(i); 536 switch (attr) { 537 case R.styleable.ViewGroup_clipChildren: 538 setClipChildren(a.getBoolean(attr, true)); 539 break; 540 case R.styleable.ViewGroup_clipToPadding: 541 setClipToPadding(a.getBoolean(attr, true)); 542 break; 543 case R.styleable.ViewGroup_animationCache: 544 setAnimationCacheEnabled(a.getBoolean(attr, true)); 545 break; 546 case R.styleable.ViewGroup_persistentDrawingCache: 547 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 548 break; 549 case R.styleable.ViewGroup_addStatesFromChildren: 550 setAddStatesFromChildren(a.getBoolean(attr, false)); 551 break; 552 case R.styleable.ViewGroup_alwaysDrawnWithCache: 553 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 554 break; 555 case R.styleable.ViewGroup_layoutAnimation: 556 int id = a.getResourceId(attr, -1); 557 if (id > 0) { 558 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 559 } 560 break; 561 case R.styleable.ViewGroup_descendantFocusability: 562 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 563 break; 564 case R.styleable.ViewGroup_splitMotionEvents: 565 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 566 break; 567 case R.styleable.ViewGroup_animateLayoutChanges: 568 boolean animateLayoutChanges = a.getBoolean(attr, false); 569 if (animateLayoutChanges) { 570 setLayoutTransition(new LayoutTransition()); 571 } 572 break; 573 case R.styleable.ViewGroup_layoutMode: 574 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 575 break; 576 case R.styleable.ViewGroup_transitionGroup: 577 setTransitionGroup(a.getBoolean(attr, false)); 578 break; 579 case R.styleable.ViewGroup_touchscreenBlocksFocus: 580 setTouchscreenBlocksFocus(a.getBoolean(attr, false)); 581 break; 582 } 583 } 584 585 a.recycle(); 586 } 587 588 /** 589 * Gets the descendant focusability of this view group. The descendant 590 * focusability defines the relationship between this view group and its 591 * descendants when looking for a view to take focus in 592 * {@link #requestFocus(int, android.graphics.Rect)}. 593 * 594 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 595 * {@link #FOCUS_BLOCK_DESCENDANTS}. 596 */ 597 @ViewDebug.ExportedProperty(category = "focus", mapping = { 598 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 599 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 600 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 601 }) 602 public int getDescendantFocusability() { 603 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 604 } 605 606 /** 607 * Set the descendant focusability of this view group. This defines the relationship 608 * between this view group and its descendants when looking for a view to 609 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 610 * 611 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 612 * {@link #FOCUS_BLOCK_DESCENDANTS}. 613 */ 614 public void setDescendantFocusability(int focusability) { 615 switch (focusability) { 616 case FOCUS_BEFORE_DESCENDANTS: 617 case FOCUS_AFTER_DESCENDANTS: 618 case FOCUS_BLOCK_DESCENDANTS: 619 break; 620 default: 621 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 622 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 623 } 624 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 625 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 626 } 627 628 /** 629 * {@inheritDoc} 630 */ 631 @Override 632 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 633 if (mFocused != null) { 634 mFocused.unFocus(this); 635 mFocused = null; 636 } 637 super.handleFocusGainInternal(direction, previouslyFocusedRect); 638 } 639 640 /** 641 * {@inheritDoc} 642 */ 643 public void requestChildFocus(View child, View focused) { 644 if (DBG) { 645 System.out.println(this + " requestChildFocus()"); 646 } 647 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 648 return; 649 } 650 651 // Unfocus us, if necessary 652 super.unFocus(focused); 653 654 // We had a previous notion of who had focus. Clear it. 655 if (mFocused != child) { 656 if (mFocused != null) { 657 mFocused.unFocus(focused); 658 } 659 660 mFocused = child; 661 } 662 if (mParent != null) { 663 mParent.requestChildFocus(this, focused); 664 } 665 } 666 667 /** 668 * {@inheritDoc} 669 */ 670 public void focusableViewAvailable(View v) { 671 if (mParent != null 672 // shortcut: don't report a new focusable view if we block our descendants from 673 // getting focus 674 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 675 && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen()) 676 // shortcut: don't report a new focusable view if we already are focused 677 // (and we don't prefer our descendants) 678 // 679 // note: knowing that mFocused is non-null is not a good enough reason 680 // to break the traversal since in that case we'd actually have to find 681 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 682 // an ancestor of v; this will get checked for at ViewAncestor 683 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 684 mParent.focusableViewAvailable(v); 685 } 686 } 687 688 /** 689 * {@inheritDoc} 690 */ 691 public boolean showContextMenuForChild(View originalView) { 692 return mParent != null && mParent.showContextMenuForChild(originalView); 693 } 694 695 /** 696 * {@inheritDoc} 697 */ 698 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 699 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 700 } 701 702 /** 703 * Find the nearest view in the specified direction that wants to take 704 * focus. 705 * 706 * @param focused The view that currently has focus 707 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 708 * FOCUS_RIGHT, or 0 for not applicable. 709 */ 710 public View focusSearch(View focused, int direction) { 711 if (isRootNamespace()) { 712 // root namespace means we should consider ourselves the top of the 713 // tree for focus searching; otherwise we could be focus searching 714 // into other tabs. see LocalActivityManager and TabHost for more info 715 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 716 } else if (mParent != null) { 717 return mParent.focusSearch(focused, direction); 718 } 719 return null; 720 } 721 722 /** 723 * {@inheritDoc} 724 */ 725 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 726 return false; 727 } 728 729 /** 730 * {@inheritDoc} 731 */ 732 @Override 733 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 734 ViewParent parent = mParent; 735 if (parent == null) { 736 return false; 737 } 738 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 739 if (!propagate) { 740 return false; 741 } 742 return parent.requestSendAccessibilityEvent(this, event); 743 } 744 745 /** 746 * Called when a child has requested sending an {@link AccessibilityEvent} and 747 * gives an opportunity to its parent to augment the event. 748 * <p> 749 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 750 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 751 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 752 * is responsible for handling this call. 753 * </p> 754 * 755 * @param child The child which requests sending the event. 756 * @param event The event to be sent. 757 * @return True if the event should be sent. 758 * 759 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 760 */ 761 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 762 if (mAccessibilityDelegate != null) { 763 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 764 } else { 765 return onRequestSendAccessibilityEventInternal(child, event); 766 } 767 } 768 769 /** 770 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 771 * 772 * Note: Called from the default {@link View.AccessibilityDelegate}. 773 */ 774 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 775 return true; 776 } 777 778 /** 779 * Translates the given bounds and intersections from child coordinates to 780 * local coordinates. In case any interactive sibling of the calling child 781 * covers the latter, a new intersections is added to the intersection list. 782 * This method is for the exclusive use by the accessibility layer to compute 783 * a point where a sequence of down and up events would click on a view. 784 * 785 * @param child The child making the call. 786 * @param bounds The bounds to translate in child coordinates. 787 * @param intersections The intersections of interactive views covering the child. 788 * @return True if the bounds and intersections were computed, false otherwise. 789 */ 790 boolean translateBoundsAndIntersectionsInWindowCoordinates(View child, 791 RectF bounds, List<RectF> intersections) { 792 // Not attached, done. 793 if (mAttachInfo == null) { 794 return false; 795 } 796 797 if (getAlpha() <= 0 || getTransitionAlpha() <= 0 || 798 getVisibility() != VISIBLE) { 799 // Cannot click on a view with an invisible predecessor. 800 return false; 801 } 802 803 // Compensate for the child transformation. 804 if (!child.hasIdentityMatrix()) { 805 Matrix matrix = child.getMatrix(); 806 matrix.mapRect(bounds); 807 final int intersectionCount = intersections.size(); 808 for (int i = 0; i < intersectionCount; i++) { 809 RectF intersection = intersections.get(i); 810 matrix.mapRect(intersection); 811 } 812 } 813 814 // Translate the bounds from child to parent coordinates. 815 final int dx = child.mLeft - mScrollX; 816 final int dy = child.mTop - mScrollY; 817 bounds.offset(dx, dy); 818 offsetRects(intersections, dx, dy); 819 820 // If the bounds do not intersect our bounds, done. 821 if (!bounds.intersects(0, 0, getWidth(), getHeight())) { 822 return false; 823 } 824 825 Iterator<View> iterator = obtainOrderedChildIterator(); 826 while (iterator.hasNext()) { 827 View sibling = iterator.next(); 828 829 // We care only about siblings over the child. 830 if (sibling == child) { 831 break; 832 } 833 834 // Ignore invisible views as they are not interactive. 835 if (!isVisible(sibling)) { 836 continue; 837 } 838 839 // Compute the sibling bounds in its coordinates. 840 RectF siblingBounds = mAttachInfo.mTmpTransformRect1; 841 siblingBounds.set(0, 0, sibling.getWidth(), sibling.getHeight()); 842 843 // Translate the sibling bounds to our coordinates. 844 offsetChildRectToMyCoords(siblingBounds, sibling); 845 846 // Compute the intersection between the child and the sibling. 847 if (siblingBounds.intersect(bounds)) { 848 List<RectF> clickableRects = new ArrayList<>(); 849 sibling.addClickableRectsForAccessibility(clickableRects); 850 851 final int clickableRectCount = clickableRects.size(); 852 for (int j = 0; j < clickableRectCount; j++) { 853 RectF clickableRect = clickableRects.get(j); 854 855 // Translate the clickable rect to our coordinates. 856 offsetChildRectToMyCoords(clickableRect, sibling); 857 858 // Compute the intersection between the child and the clickable rects. 859 if (clickableRect.intersect(bounds)) { 860 // If a clickable rect completely covers the child, done. 861 if (clickableRect.equals(bounds)) { 862 releaseOrderedChildIterator(); 863 return false; 864 } 865 // Keep track of the intersection rectangle. 866 intersections.add(clickableRect); 867 } 868 } 869 } 870 } 871 872 releaseOrderedChildIterator(); 873 874 if (mParent instanceof ViewGroup) { 875 ViewGroup parentGroup = (ViewGroup) mParent; 876 return parentGroup.translateBoundsAndIntersectionsInWindowCoordinates( 877 this, bounds, intersections); 878 } 879 880 return true; 881 } 882 883 @Override 884 void addClickableRectsForAccessibility(List<RectF> outRects) { 885 int sizeBefore = outRects.size(); 886 887 super.addClickableRectsForAccessibility(outRects); 888 889 // If we added ourselves, then no need to visit children. 890 if (outRects.size() > sizeBefore) { 891 return; 892 } 893 894 Iterator<View> iterator = obtainOrderedChildIterator(); 895 while (iterator.hasNext()) { 896 View child = iterator.next(); 897 898 // Cannot click on an invisible view. 899 if (!isVisible(child)) { 900 continue; 901 } 902 903 sizeBefore = outRects.size(); 904 905 // Add clickable rects in the child bounds. 906 child.addClickableRectsForAccessibility(outRects); 907 908 // Offset the clickable rects for out children to our coordinates. 909 final int sizeAfter = outRects.size(); 910 for (int j = sizeBefore; j < sizeAfter; j++) { 911 RectF rect = outRects.get(j); 912 913 // Translate the clickable rect to our coordinates. 914 offsetChildRectToMyCoords(rect, child); 915 916 // If a clickable rect fills the parent, done. 917 if ((int) rect.left == 0 && (int) rect.top == 0 918 && (int) rect.right == mRight && (int) rect.bottom == mBottom) { 919 releaseOrderedChildIterator(); 920 return; 921 } 922 } 923 } 924 925 releaseOrderedChildIterator(); 926 } 927 928 private void offsetChildRectToMyCoords(RectF rect, View child) { 929 if (!child.hasIdentityMatrix()) { 930 child.getMatrix().mapRect(rect); 931 } 932 final int childDx = child.mLeft - mScrollX; 933 final int childDy = child.mTop - mScrollY; 934 rect.offset(childDx, childDy); 935 } 936 937 private static boolean isVisible(View view) { 938 return (view.getAlpha() > 0 && view.getTransitionAlpha() > 0 && 939 view.getVisibility() == VISIBLE); 940 } 941 942 /** 943 * Obtains the iterator to traverse the children in a descending Z order. 944 * Only one party can use the iterator at any given time and you cannot 945 * modify the children while using this iterator. Acquisition if already 946 * obtained is an error. 947 * 948 * @return The child iterator. 949 */ 950 OrderedChildIterator obtainOrderedChildIterator() { 951 if (mOrderedChildIterator == null) { 952 mOrderedChildIterator = new OrderedChildIterator(); 953 } else if (mOrderedChildIterator.isInitialized()) { 954 throw new IllegalStateException("Already obtained"); 955 } 956 mOrderedChildIterator.initialize(); 957 return mOrderedChildIterator; 958 } 959 960 /** 961 * Releases the iterator to traverse the children in a descending Z order. 962 * Release if not obtained is an error. 963 */ 964 void releaseOrderedChildIterator() { 965 if (mOrderedChildIterator == null || !mOrderedChildIterator.isInitialized()) { 966 throw new IllegalStateException("Not obtained"); 967 } 968 mOrderedChildIterator.release(); 969 } 970 971 /** 972 * Called when a child view has changed whether or not it is tracking transient state. 973 */ 974 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 975 final boolean oldHasTransientState = hasTransientState(); 976 if (childHasTransientState) { 977 mChildCountWithTransientState++; 978 } else { 979 mChildCountWithTransientState--; 980 } 981 982 final boolean newHasTransientState = hasTransientState(); 983 if (mParent != null && oldHasTransientState != newHasTransientState) { 984 try { 985 mParent.childHasTransientStateChanged(this, newHasTransientState); 986 } catch (AbstractMethodError e) { 987 Log.e(TAG, mParent.getClass().getSimpleName() + 988 " does not fully implement ViewParent", e); 989 } 990 } 991 } 992 993 @Override 994 public boolean hasTransientState() { 995 return mChildCountWithTransientState > 0 || super.hasTransientState(); 996 } 997 998 /** 999 * {@inheritDoc} 1000 */ 1001 @Override 1002 public boolean dispatchUnhandledMove(View focused, int direction) { 1003 return mFocused != null && 1004 mFocused.dispatchUnhandledMove(focused, direction); 1005 } 1006 1007 /** 1008 * {@inheritDoc} 1009 */ 1010 public void clearChildFocus(View child) { 1011 if (DBG) { 1012 System.out.println(this + " clearChildFocus()"); 1013 } 1014 1015 mFocused = null; 1016 if (mParent != null) { 1017 mParent.clearChildFocus(this); 1018 } 1019 } 1020 1021 /** 1022 * {@inheritDoc} 1023 */ 1024 @Override 1025 public void clearFocus() { 1026 if (DBG) { 1027 System.out.println(this + " clearFocus()"); 1028 } 1029 if (mFocused == null) { 1030 super.clearFocus(); 1031 } else { 1032 View focused = mFocused; 1033 mFocused = null; 1034 focused.clearFocus(); 1035 } 1036 } 1037 1038 /** 1039 * {@inheritDoc} 1040 */ 1041 @Override 1042 void unFocus(View focused) { 1043 if (DBG) { 1044 System.out.println(this + " unFocus()"); 1045 } 1046 if (mFocused == null) { 1047 super.unFocus(focused); 1048 } else { 1049 mFocused.unFocus(focused); 1050 mFocused = null; 1051 } 1052 } 1053 1054 /** 1055 * Returns the focused child of this view, if any. The child may have focus 1056 * or contain focus. 1057 * 1058 * @return the focused child or null. 1059 */ 1060 public View getFocusedChild() { 1061 return mFocused; 1062 } 1063 1064 View getDeepestFocusedChild() { 1065 View v = this; 1066 while (v != null) { 1067 if (v.isFocused()) { 1068 return v; 1069 } 1070 v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null; 1071 } 1072 return null; 1073 } 1074 1075 /** 1076 * Returns true if this view has or contains focus 1077 * 1078 * @return true if this view has or contains focus 1079 */ 1080 @Override 1081 public boolean hasFocus() { 1082 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 1083 } 1084 1085 /* 1086 * (non-Javadoc) 1087 * 1088 * @see android.view.View#findFocus() 1089 */ 1090 @Override 1091 public View findFocus() { 1092 if (DBG) { 1093 System.out.println("Find focus in " + this + ": flags=" 1094 + isFocused() + ", child=" + mFocused); 1095 } 1096 1097 if (isFocused()) { 1098 return this; 1099 } 1100 1101 if (mFocused != null) { 1102 return mFocused.findFocus(); 1103 } 1104 return null; 1105 } 1106 1107 /** 1108 * {@inheritDoc} 1109 */ 1110 @Override 1111 public boolean hasFocusable() { 1112 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 1113 return false; 1114 } 1115 1116 if (isFocusable()) { 1117 return true; 1118 } 1119 1120 final int descendantFocusability = getDescendantFocusability(); 1121 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1122 final int count = mChildrenCount; 1123 final View[] children = mChildren; 1124 1125 for (int i = 0; i < count; i++) { 1126 final View child = children[i]; 1127 if (child.hasFocusable()) { 1128 return true; 1129 } 1130 } 1131 } 1132 1133 return false; 1134 } 1135 1136 /** 1137 * {@inheritDoc} 1138 */ 1139 @Override 1140 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 1141 final int focusableCount = views.size(); 1142 1143 final int descendantFocusability = getDescendantFocusability(); 1144 1145 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1146 if (shouldBlockFocusForTouchscreen()) { 1147 focusableMode |= FOCUSABLES_TOUCH_MODE; 1148 } 1149 1150 final int count = mChildrenCount; 1151 final View[] children = mChildren; 1152 1153 for (int i = 0; i < count; i++) { 1154 final View child = children[i]; 1155 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1156 child.addFocusables(views, direction, focusableMode); 1157 } 1158 } 1159 } 1160 1161 // we add ourselves (if focusable) in all cases except for when we are 1162 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 1163 // to avoid the focus search finding layouts when a more precise search 1164 // among the focusable children would be more interesting. 1165 if ((descendantFocusability != FOCUS_AFTER_DESCENDANTS 1166 // No focusable descendants 1167 || (focusableCount == views.size())) && 1168 (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())) { 1169 super.addFocusables(views, direction, focusableMode); 1170 } 1171 } 1172 1173 /** 1174 * Set whether this ViewGroup should ignore focus requests for itself and its children. 1175 * If this option is enabled and the ViewGroup or a descendant currently has focus, focus 1176 * will proceed forward. 1177 * 1178 * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen 1179 */ 1180 public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) { 1181 if (touchscreenBlocksFocus) { 1182 mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1183 if (hasFocus()) { 1184 final View focusedChild = getDeepestFocusedChild(); 1185 if (!focusedChild.isFocusableInTouchMode()) { 1186 final View newFocus = focusSearch(FOCUS_FORWARD); 1187 if (newFocus != null) { 1188 newFocus.requestFocus(); 1189 } 1190 } 1191 } 1192 } else { 1193 mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1194 } 1195 } 1196 1197 /** 1198 * Check whether this ViewGroup should ignore focus requests for itself and its children. 1199 */ 1200 public boolean getTouchscreenBlocksFocus() { 1201 return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0; 1202 } 1203 1204 boolean shouldBlockFocusForTouchscreen() { 1205 return getTouchscreenBlocksFocus() && 1206 mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN); 1207 } 1208 1209 @Override 1210 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 1211 super.findViewsWithText(outViews, text, flags); 1212 final int childrenCount = mChildrenCount; 1213 final View[] children = mChildren; 1214 for (int i = 0; i < childrenCount; i++) { 1215 View child = children[i]; 1216 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1217 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 1218 child.findViewsWithText(outViews, text, flags); 1219 } 1220 } 1221 } 1222 1223 /** @hide */ 1224 @Override 1225 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1226 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 1227 if (foundView != null) { 1228 return foundView; 1229 } 1230 final int childrenCount = mChildrenCount; 1231 final View[] children = mChildren; 1232 for (int i = 0; i < childrenCount; i++) { 1233 View child = children[i]; 1234 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 1235 if (foundView != null) { 1236 return foundView; 1237 } 1238 } 1239 return null; 1240 } 1241 1242 /** 1243 * {@inheritDoc} 1244 */ 1245 @Override 1246 public void dispatchWindowFocusChanged(boolean hasFocus) { 1247 super.dispatchWindowFocusChanged(hasFocus); 1248 final int count = mChildrenCount; 1249 final View[] children = mChildren; 1250 for (int i = 0; i < count; i++) { 1251 children[i].dispatchWindowFocusChanged(hasFocus); 1252 } 1253 } 1254 1255 /** 1256 * {@inheritDoc} 1257 */ 1258 @Override 1259 public void addTouchables(ArrayList<View> views) { 1260 super.addTouchables(views); 1261 1262 final int count = mChildrenCount; 1263 final View[] children = mChildren; 1264 1265 for (int i = 0; i < count; i++) { 1266 final View child = children[i]; 1267 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1268 child.addTouchables(views); 1269 } 1270 } 1271 } 1272 1273 /** 1274 * @hide 1275 */ 1276 @Override 1277 public void makeOptionalFitsSystemWindows() { 1278 super.makeOptionalFitsSystemWindows(); 1279 final int count = mChildrenCount; 1280 final View[] children = mChildren; 1281 for (int i = 0; i < count; i++) { 1282 children[i].makeOptionalFitsSystemWindows(); 1283 } 1284 } 1285 1286 /** 1287 * {@inheritDoc} 1288 */ 1289 @Override 1290 public void dispatchDisplayHint(int hint) { 1291 super.dispatchDisplayHint(hint); 1292 final int count = mChildrenCount; 1293 final View[] children = mChildren; 1294 for (int i = 0; i < count; i++) { 1295 children[i].dispatchDisplayHint(hint); 1296 } 1297 } 1298 1299 /** 1300 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1301 * action. 1302 * 1303 * @param child The view whose visibility has changed 1304 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1305 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1306 * @hide 1307 */ 1308 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1309 if (mTransition != null) { 1310 if (newVisibility == VISIBLE) { 1311 mTransition.showChild(this, child, oldVisibility); 1312 } else { 1313 mTransition.hideChild(this, child, newVisibility); 1314 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1315 // Only track this on disappearing views - appearing views are already visible 1316 // and don't need special handling during drawChild() 1317 if (mVisibilityChangingChildren == null) { 1318 mVisibilityChangingChildren = new ArrayList<View>(); 1319 } 1320 mVisibilityChangingChildren.add(child); 1321 addDisappearingView(child); 1322 } 1323 } 1324 } 1325 1326 // in all cases, for drags 1327 if (mCurrentDrag != null) { 1328 if (newVisibility == VISIBLE) { 1329 notifyChildOfDrag(child); 1330 } 1331 } 1332 } 1333 1334 /** 1335 * {@inheritDoc} 1336 */ 1337 @Override 1338 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1339 super.dispatchVisibilityChanged(changedView, visibility); 1340 final int count = mChildrenCount; 1341 final View[] children = mChildren; 1342 for (int i = 0; i < count; i++) { 1343 children[i].dispatchVisibilityChanged(changedView, visibility); 1344 } 1345 } 1346 1347 /** 1348 * {@inheritDoc} 1349 */ 1350 @Override 1351 public void dispatchWindowVisibilityChanged(int visibility) { 1352 super.dispatchWindowVisibilityChanged(visibility); 1353 final int count = mChildrenCount; 1354 final View[] children = mChildren; 1355 for (int i = 0; i < count; i++) { 1356 children[i].dispatchWindowVisibilityChanged(visibility); 1357 } 1358 } 1359 1360 /** 1361 * {@inheritDoc} 1362 */ 1363 @Override 1364 public void dispatchConfigurationChanged(Configuration newConfig) { 1365 super.dispatchConfigurationChanged(newConfig); 1366 final int count = mChildrenCount; 1367 final View[] children = mChildren; 1368 for (int i = 0; i < count; i++) { 1369 children[i].dispatchConfigurationChanged(newConfig); 1370 } 1371 } 1372 1373 /** 1374 * {@inheritDoc} 1375 */ 1376 public void recomputeViewAttributes(View child) { 1377 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1378 ViewParent parent = mParent; 1379 if (parent != null) parent.recomputeViewAttributes(this); 1380 } 1381 } 1382 1383 @Override 1384 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1385 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1386 super.dispatchCollectViewAttributes(attachInfo, visibility); 1387 final int count = mChildrenCount; 1388 final View[] children = mChildren; 1389 for (int i = 0; i < count; i++) { 1390 final View child = children[i]; 1391 child.dispatchCollectViewAttributes(attachInfo, 1392 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1393 } 1394 } 1395 } 1396 1397 /** 1398 * {@inheritDoc} 1399 */ 1400 public void bringChildToFront(View child) { 1401 int index = indexOfChild(child); 1402 if (index >= 0) { 1403 removeFromArray(index); 1404 addInArray(child, mChildrenCount); 1405 child.mParent = this; 1406 requestLayout(); 1407 invalidate(); 1408 } 1409 } 1410 1411 private PointF getLocalPoint() { 1412 if (mLocalPoint == null) mLocalPoint = new PointF(); 1413 return mLocalPoint; 1414 } 1415 1416 /** 1417 * {@inheritDoc} 1418 */ 1419 // TODO: Write real docs 1420 @Override 1421 public boolean dispatchDragEvent(DragEvent event) { 1422 boolean retval = false; 1423 final float tx = event.mX; 1424 final float ty = event.mY; 1425 1426 ViewRootImpl root = getViewRootImpl(); 1427 1428 // Dispatch down the view hierarchy 1429 final PointF localPoint = getLocalPoint(); 1430 1431 switch (event.mAction) { 1432 case DragEvent.ACTION_DRAG_STARTED: { 1433 // clear state to recalculate which views we drag over 1434 mCurrentDragView = null; 1435 1436 // Set up our tracking of drag-started notifications 1437 mCurrentDrag = DragEvent.obtain(event); 1438 if (mDragNotifiedChildren == null) { 1439 mDragNotifiedChildren = new HashSet<View>(); 1440 } else { 1441 mDragNotifiedChildren.clear(); 1442 } 1443 1444 // Now dispatch down to our children, caching the responses 1445 mChildAcceptsDrag = false; 1446 final int count = mChildrenCount; 1447 final View[] children = mChildren; 1448 for (int i = 0; i < count; i++) { 1449 final View child = children[i]; 1450 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1451 if (child.getVisibility() == VISIBLE) { 1452 final boolean handled = notifyChildOfDrag(children[i]); 1453 if (handled) { 1454 mChildAcceptsDrag = true; 1455 } 1456 } 1457 } 1458 1459 // Return HANDLED if one of our children can accept the drag 1460 if (mChildAcceptsDrag) { 1461 retval = true; 1462 } 1463 } break; 1464 1465 case DragEvent.ACTION_DRAG_ENDED: { 1466 // Release the bookkeeping now that the drag lifecycle has ended 1467 if (mDragNotifiedChildren != null) { 1468 for (View child : mDragNotifiedChildren) { 1469 // If a child was notified about an ongoing drag, it's told that it's over 1470 child.dispatchDragEvent(event); 1471 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1472 child.refreshDrawableState(); 1473 } 1474 1475 mDragNotifiedChildren.clear(); 1476 if (mCurrentDrag != null) { 1477 mCurrentDrag.recycle(); 1478 mCurrentDrag = null; 1479 } 1480 } 1481 1482 // We consider drag-ended to have been handled if one of our children 1483 // had offered to handle the drag. 1484 if (mChildAcceptsDrag) { 1485 retval = true; 1486 } 1487 } break; 1488 1489 case DragEvent.ACTION_DRAG_LOCATION: { 1490 // Find the [possibly new] drag target 1491 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1492 1493 // If we've changed apparent drag target, tell the view root which view 1494 // we're over now [for purposes of the eventual drag-recipient-changed 1495 // notifications to the framework] and tell the new target that the drag 1496 // has entered its bounds. The root will see setDragFocus() calls all 1497 // the way down to the final leaf view that is handling the LOCATION event 1498 // before reporting the new potential recipient to the framework. 1499 if (mCurrentDragView != target) { 1500 root.setDragFocus(target); 1501 1502 final int action = event.mAction; 1503 // If we've dragged off of a child view, send it the EXITED message 1504 if (mCurrentDragView != null) { 1505 final View view = mCurrentDragView; 1506 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1507 view.dispatchDragEvent(event); 1508 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1509 view.refreshDrawableState(); 1510 } 1511 mCurrentDragView = target; 1512 1513 // If we've dragged over a new child view, send it the ENTERED message 1514 if (target != null) { 1515 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1516 target.dispatchDragEvent(event); 1517 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1518 target.refreshDrawableState(); 1519 } 1520 event.mAction = action; // restore the event's original state 1521 } 1522 1523 // Dispatch the actual drag location notice, localized into its coordinates 1524 if (target != null) { 1525 event.mX = localPoint.x; 1526 event.mY = localPoint.y; 1527 1528 retval = target.dispatchDragEvent(event); 1529 1530 event.mX = tx; 1531 event.mY = ty; 1532 } 1533 } break; 1534 1535 /* Entered / exited dispatch 1536 * 1537 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1538 * that we're about to get the corresponding LOCATION event, which we will use to 1539 * determine which of our children is the new target; at that point we will 1540 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1541 * 1542 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1543 * drag has left this ViewGroup, we know by definition that every contained subview 1544 * is also no longer under the drag point. 1545 */ 1546 1547 case DragEvent.ACTION_DRAG_EXITED: { 1548 if (mCurrentDragView != null) { 1549 final View view = mCurrentDragView; 1550 view.dispatchDragEvent(event); 1551 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1552 view.refreshDrawableState(); 1553 1554 mCurrentDragView = null; 1555 } 1556 } break; 1557 1558 case DragEvent.ACTION_DROP: { 1559 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1560 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1561 if (target != null) { 1562 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1563 event.mX = localPoint.x; 1564 event.mY = localPoint.y; 1565 retval = target.dispatchDragEvent(event); 1566 event.mX = tx; 1567 event.mY = ty; 1568 } else { 1569 if (ViewDebug.DEBUG_DRAG) { 1570 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1571 } 1572 } 1573 } break; 1574 } 1575 1576 // If none of our children could handle the event, try here 1577 if (!retval) { 1578 // Call up to the View implementation that dispatches to installed listeners 1579 retval = super.dispatchDragEvent(event); 1580 } 1581 return retval; 1582 } 1583 1584 // Find the frontmost child view that lies under the given point, and calculate 1585 // the position within its own local coordinate system. 1586 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1587 final int count = mChildrenCount; 1588 final View[] children = mChildren; 1589 for (int i = count - 1; i >= 0; i--) { 1590 final View child = children[i]; 1591 if (!child.canAcceptDrag()) { 1592 continue; 1593 } 1594 1595 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1596 return child; 1597 } 1598 } 1599 return null; 1600 } 1601 1602 boolean notifyChildOfDrag(View child) { 1603 if (ViewDebug.DEBUG_DRAG) { 1604 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1605 } 1606 1607 boolean canAccept = false; 1608 if (! mDragNotifiedChildren.contains(child)) { 1609 mDragNotifiedChildren.add(child); 1610 canAccept = child.dispatchDragEvent(mCurrentDrag); 1611 if (canAccept && !child.canAcceptDrag()) { 1612 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1613 child.refreshDrawableState(); 1614 } 1615 } 1616 return canAccept; 1617 } 1618 1619 @Override 1620 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1621 super.dispatchWindowSystemUiVisiblityChanged(visible); 1622 1623 final int count = mChildrenCount; 1624 final View[] children = mChildren; 1625 for (int i=0; i <count; i++) { 1626 final View child = children[i]; 1627 child.dispatchWindowSystemUiVisiblityChanged(visible); 1628 } 1629 } 1630 1631 @Override 1632 public void dispatchSystemUiVisibilityChanged(int visible) { 1633 super.dispatchSystemUiVisibilityChanged(visible); 1634 1635 final int count = mChildrenCount; 1636 final View[] children = mChildren; 1637 for (int i=0; i <count; i++) { 1638 final View child = children[i]; 1639 child.dispatchSystemUiVisibilityChanged(visible); 1640 } 1641 } 1642 1643 @Override 1644 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1645 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1646 1647 final int count = mChildrenCount; 1648 final View[] children = mChildren; 1649 for (int i=0; i <count; i++) { 1650 final View child = children[i]; 1651 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1652 } 1653 return changed; 1654 } 1655 1656 /** 1657 * {@inheritDoc} 1658 */ 1659 @Override 1660 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1661 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1662 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1663 return super.dispatchKeyEventPreIme(event); 1664 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1665 == PFLAG_HAS_BOUNDS) { 1666 return mFocused.dispatchKeyEventPreIme(event); 1667 } 1668 return false; 1669 } 1670 1671 /** 1672 * {@inheritDoc} 1673 */ 1674 @Override 1675 public boolean dispatchKeyEvent(KeyEvent event) { 1676 if (mInputEventConsistencyVerifier != null) { 1677 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1678 } 1679 1680 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1681 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1682 if (super.dispatchKeyEvent(event)) { 1683 return true; 1684 } 1685 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1686 == PFLAG_HAS_BOUNDS) { 1687 if (mFocused.dispatchKeyEvent(event)) { 1688 return true; 1689 } 1690 } 1691 1692 if (mInputEventConsistencyVerifier != null) { 1693 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1694 } 1695 return false; 1696 } 1697 1698 /** 1699 * {@inheritDoc} 1700 */ 1701 @Override 1702 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1703 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1704 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1705 return super.dispatchKeyShortcutEvent(event); 1706 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1707 == PFLAG_HAS_BOUNDS) { 1708 return mFocused.dispatchKeyShortcutEvent(event); 1709 } 1710 return false; 1711 } 1712 1713 /** 1714 * {@inheritDoc} 1715 */ 1716 @Override 1717 public boolean dispatchTrackballEvent(MotionEvent event) { 1718 if (mInputEventConsistencyVerifier != null) { 1719 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1720 } 1721 1722 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1723 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1724 if (super.dispatchTrackballEvent(event)) { 1725 return true; 1726 } 1727 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1728 == PFLAG_HAS_BOUNDS) { 1729 if (mFocused.dispatchTrackballEvent(event)) { 1730 return true; 1731 } 1732 } 1733 1734 if (mInputEventConsistencyVerifier != null) { 1735 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1736 } 1737 return false; 1738 } 1739 1740 /** 1741 * {@inheritDoc} 1742 */ 1743 @SuppressWarnings({"ConstantConditions"}) 1744 @Override 1745 protected boolean dispatchHoverEvent(MotionEvent event) { 1746 final int action = event.getAction(); 1747 1748 // First check whether the view group wants to intercept the hover event. 1749 final boolean interceptHover = onInterceptHoverEvent(event); 1750 event.setAction(action); // restore action in case it was changed 1751 1752 MotionEvent eventNoHistory = event; 1753 boolean handled = false; 1754 1755 // Send events to the hovered children and build a new list of hover targets until 1756 // one is found that handles the event. 1757 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1758 mFirstHoverTarget = null; 1759 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1760 final float x = event.getX(); 1761 final float y = event.getY(); 1762 final int childrenCount = mChildrenCount; 1763 if (childrenCount != 0) { 1764 final ArrayList<View> preorderedList = buildOrderedChildList(); 1765 final boolean customOrder = preorderedList == null 1766 && isChildrenDrawingOrderEnabled(); 1767 final View[] children = mChildren; 1768 HoverTarget lastHoverTarget = null; 1769 for (int i = childrenCount - 1; i >= 0; i--) { 1770 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1771 final View child = (preorderedList == null) 1772 ? children[childIndex] : preorderedList.get(childIndex); 1773 if (!canViewReceivePointerEvents(child) 1774 || !isTransformedTouchPointInView(x, y, child, null)) { 1775 continue; 1776 } 1777 1778 // Obtain a hover target for this child. Dequeue it from the 1779 // old hover target list if the child was previously hovered. 1780 HoverTarget hoverTarget = firstOldHoverTarget; 1781 final boolean wasHovered; 1782 for (HoverTarget predecessor = null; ;) { 1783 if (hoverTarget == null) { 1784 hoverTarget = HoverTarget.obtain(child); 1785 wasHovered = false; 1786 break; 1787 } 1788 1789 if (hoverTarget.child == child) { 1790 if (predecessor != null) { 1791 predecessor.next = hoverTarget.next; 1792 } else { 1793 firstOldHoverTarget = hoverTarget.next; 1794 } 1795 hoverTarget.next = null; 1796 wasHovered = true; 1797 break; 1798 } 1799 1800 predecessor = hoverTarget; 1801 hoverTarget = hoverTarget.next; 1802 } 1803 1804 // Enqueue the hover target onto the new hover target list. 1805 if (lastHoverTarget != null) { 1806 lastHoverTarget.next = hoverTarget; 1807 } else { 1808 mFirstHoverTarget = hoverTarget; 1809 } 1810 lastHoverTarget = hoverTarget; 1811 1812 // Dispatch the event to the child. 1813 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1814 if (!wasHovered) { 1815 // Send the enter as is. 1816 handled |= dispatchTransformedGenericPointerEvent( 1817 event, child); // enter 1818 } 1819 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1820 if (!wasHovered) { 1821 // Synthesize an enter from a move. 1822 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1823 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1824 handled |= dispatchTransformedGenericPointerEvent( 1825 eventNoHistory, child); // enter 1826 eventNoHistory.setAction(action); 1827 1828 handled |= dispatchTransformedGenericPointerEvent( 1829 eventNoHistory, child); // move 1830 } else { 1831 // Send the move as is. 1832 handled |= dispatchTransformedGenericPointerEvent(event, child); 1833 } 1834 } 1835 if (handled) { 1836 break; 1837 } 1838 } 1839 if (preorderedList != null) preorderedList.clear(); 1840 } 1841 } 1842 1843 // Send exit events to all previously hovered children that are no longer hovered. 1844 while (firstOldHoverTarget != null) { 1845 final View child = firstOldHoverTarget.child; 1846 1847 // Exit the old hovered child. 1848 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1849 // Send the exit as is. 1850 handled |= dispatchTransformedGenericPointerEvent( 1851 event, child); // exit 1852 } else { 1853 // Synthesize an exit from a move or enter. 1854 // Ignore the result because hover focus has moved to a different view. 1855 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1856 dispatchTransformedGenericPointerEvent( 1857 event, child); // move 1858 } 1859 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1860 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1861 dispatchTransformedGenericPointerEvent( 1862 eventNoHistory, child); // exit 1863 eventNoHistory.setAction(action); 1864 } 1865 1866 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1867 firstOldHoverTarget.recycle(); 1868 firstOldHoverTarget = nextOldHoverTarget; 1869 } 1870 1871 // Send events to the view group itself if no children have handled it. 1872 boolean newHoveredSelf = !handled; 1873 if (newHoveredSelf == mHoveredSelf) { 1874 if (newHoveredSelf) { 1875 // Send event to the view group as before. 1876 handled |= super.dispatchHoverEvent(event); 1877 } 1878 } else { 1879 if (mHoveredSelf) { 1880 // Exit the view group. 1881 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1882 // Send the exit as is. 1883 handled |= super.dispatchHoverEvent(event); // exit 1884 } else { 1885 // Synthesize an exit from a move or enter. 1886 // Ignore the result because hover focus is moving to a different view. 1887 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1888 super.dispatchHoverEvent(event); // move 1889 } 1890 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1891 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1892 super.dispatchHoverEvent(eventNoHistory); // exit 1893 eventNoHistory.setAction(action); 1894 } 1895 mHoveredSelf = false; 1896 } 1897 1898 if (newHoveredSelf) { 1899 // Enter the view group. 1900 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1901 // Send the enter as is. 1902 handled |= super.dispatchHoverEvent(event); // enter 1903 mHoveredSelf = true; 1904 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1905 // Synthesize an enter from a move. 1906 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1907 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1908 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1909 eventNoHistory.setAction(action); 1910 1911 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1912 mHoveredSelf = true; 1913 } 1914 } 1915 } 1916 1917 // Recycle the copy of the event that we made. 1918 if (eventNoHistory != event) { 1919 eventNoHistory.recycle(); 1920 } 1921 1922 // Done. 1923 return handled; 1924 } 1925 1926 private void exitHoverTargets() { 1927 if (mHoveredSelf || mFirstHoverTarget != null) { 1928 final long now = SystemClock.uptimeMillis(); 1929 MotionEvent event = MotionEvent.obtain(now, now, 1930 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1931 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1932 dispatchHoverEvent(event); 1933 event.recycle(); 1934 } 1935 } 1936 1937 private void cancelHoverTarget(View view) { 1938 HoverTarget predecessor = null; 1939 HoverTarget target = mFirstHoverTarget; 1940 while (target != null) { 1941 final HoverTarget next = target.next; 1942 if (target.child == view) { 1943 if (predecessor == null) { 1944 mFirstHoverTarget = next; 1945 } else { 1946 predecessor.next = next; 1947 } 1948 target.recycle(); 1949 1950 final long now = SystemClock.uptimeMillis(); 1951 MotionEvent event = MotionEvent.obtain(now, now, 1952 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1953 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1954 view.dispatchHoverEvent(event); 1955 event.recycle(); 1956 return; 1957 } 1958 predecessor = target; 1959 target = next; 1960 } 1961 } 1962 1963 /** @hide */ 1964 @Override 1965 protected boolean hasHoveredChild() { 1966 return mFirstHoverTarget != null; 1967 } 1968 1969 @Override 1970 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1971 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1972 try { 1973 final int childrenCount = children.getChildCount(); 1974 for (int i = 0; i < childrenCount; i++) { 1975 View child = children.getChildAt(i); 1976 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1977 if (child.includeForAccessibility()) { 1978 childrenForAccessibility.add(child); 1979 } else { 1980 child.addChildrenForAccessibility(childrenForAccessibility); 1981 } 1982 } 1983 } 1984 } finally { 1985 children.recycle(); 1986 } 1987 } 1988 1989 /** 1990 * Implement this method to intercept hover events before they are handled 1991 * by child views. 1992 * <p> 1993 * This method is called before dispatching a hover event to a child of 1994 * the view group or to the view group's own {@link #onHoverEvent} to allow 1995 * the view group a chance to intercept the hover event. 1996 * This method can also be used to watch all pointer motions that occur within 1997 * the bounds of the view group even when the pointer is hovering over 1998 * a child of the view group rather than over the view group itself. 1999 * </p><p> 2000 * The view group can prevent its children from receiving hover events by 2001 * implementing this method and returning <code>true</code> to indicate 2002 * that it would like to intercept hover events. The view group must 2003 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 2004 * for as long as it wishes to continue intercepting hover events from 2005 * its children. 2006 * </p><p> 2007 * Interception preserves the invariant that at most one view can be 2008 * hovered at a time by transferring hover focus from the currently hovered 2009 * child to the view group or vice-versa as needed. 2010 * </p><p> 2011 * If this method returns <code>true</code> and a child is already hovered, then the 2012 * child view will first receive a hover exit event and then the view group 2013 * itself will receive a hover enter event in {@link #onHoverEvent}. 2014 * Likewise, if this method had previously returned <code>true</code> to intercept hover 2015 * events and instead returns <code>false</code> while the pointer is hovering 2016 * within the bounds of one of a child, then the view group will first receive a 2017 * hover exit event in {@link #onHoverEvent} and then the hovered child will 2018 * receive a hover enter event. 2019 * </p><p> 2020 * The default implementation always returns false. 2021 * </p> 2022 * 2023 * @param event The motion event that describes the hover. 2024 * @return True if the view group would like to intercept the hover event 2025 * and prevent its children from receiving it. 2026 */ 2027 public boolean onInterceptHoverEvent(MotionEvent event) { 2028 return false; 2029 } 2030 2031 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 2032 if (event.getHistorySize() == 0) { 2033 return event; 2034 } 2035 return MotionEvent.obtainNoHistory(event); 2036 } 2037 2038 /** 2039 * {@inheritDoc} 2040 */ 2041 @Override 2042 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 2043 // Send the event to the child under the pointer. 2044 final int childrenCount = mChildrenCount; 2045 if (childrenCount != 0) { 2046 final float x = event.getX(); 2047 final float y = event.getY(); 2048 2049 final ArrayList<View> preorderedList = buildOrderedChildList(); 2050 final boolean customOrder = preorderedList == null 2051 && isChildrenDrawingOrderEnabled(); 2052 final View[] children = mChildren; 2053 for (int i = childrenCount - 1; i >= 0; i--) { 2054 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 2055 final View child = (preorderedList == null) 2056 ? children[childIndex] : preorderedList.get(childIndex); 2057 if (!canViewReceivePointerEvents(child) 2058 || !isTransformedTouchPointInView(x, y, child, null)) { 2059 continue; 2060 } 2061 2062 if (dispatchTransformedGenericPointerEvent(event, child)) { 2063 if (preorderedList != null) preorderedList.clear(); 2064 return true; 2065 } 2066 } 2067 if (preorderedList != null) preorderedList.clear(); 2068 } 2069 2070 // No child handled the event. Send it to this view group. 2071 return super.dispatchGenericPointerEvent(event); 2072 } 2073 2074 /** 2075 * {@inheritDoc} 2076 */ 2077 @Override 2078 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 2079 // Send the event to the focused child or to this view group if it has focus. 2080 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 2081 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 2082 return super.dispatchGenericFocusedEvent(event); 2083 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 2084 == PFLAG_HAS_BOUNDS) { 2085 return mFocused.dispatchGenericMotionEvent(event); 2086 } 2087 return false; 2088 } 2089 2090 /** 2091 * Dispatches a generic pointer event to a child, taking into account 2092 * transformations that apply to the child. 2093 * 2094 * @param event The event to send. 2095 * @param child The view to send the event to. 2096 * @return {@code true} if the child handled the event. 2097 */ 2098 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 2099 final float offsetX = mScrollX - child.mLeft; 2100 final float offsetY = mScrollY - child.mTop; 2101 2102 boolean handled; 2103 if (!child.hasIdentityMatrix()) { 2104 MotionEvent transformedEvent = MotionEvent.obtain(event); 2105 transformedEvent.offsetLocation(offsetX, offsetY); 2106 transformedEvent.transform(child.getInverseMatrix()); 2107 handled = child.dispatchGenericMotionEvent(transformedEvent); 2108 transformedEvent.recycle(); 2109 } else { 2110 event.offsetLocation(offsetX, offsetY); 2111 handled = child.dispatchGenericMotionEvent(event); 2112 event.offsetLocation(-offsetX, -offsetY); 2113 } 2114 return handled; 2115 } 2116 2117 /** 2118 * {@inheritDoc} 2119 */ 2120 @Override 2121 public boolean dispatchTouchEvent(MotionEvent ev) { 2122 if (mInputEventConsistencyVerifier != null) { 2123 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 2124 } 2125 2126 boolean handled = false; 2127 if (onFilterTouchEventForSecurity(ev)) { 2128 final int action = ev.getAction(); 2129 final int actionMasked = action & MotionEvent.ACTION_MASK; 2130 2131 // Handle an initial down. 2132 if (actionMasked == MotionEvent.ACTION_DOWN) { 2133 // Throw away all previous state when starting a new touch gesture. 2134 // The framework may have dropped the up or cancel event for the previous gesture 2135 // due to an app switch, ANR, or some other state change. 2136 cancelAndClearTouchTargets(ev); 2137 resetTouchState(); 2138 } 2139 2140 // Check for interception. 2141 final boolean intercepted; 2142 if (actionMasked == MotionEvent.ACTION_DOWN 2143 || mFirstTouchTarget != null) { 2144 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 2145 if (!disallowIntercept) { 2146 intercepted = onInterceptTouchEvent(ev); 2147 ev.setAction(action); // restore action in case it was changed 2148 } else { 2149 intercepted = false; 2150 } 2151 } else { 2152 // There are no touch targets and this action is not an initial down 2153 // so this view group continues to intercept touches. 2154 intercepted = true; 2155 } 2156 2157 // Check for cancelation. 2158 final boolean canceled = resetCancelNextUpFlag(this) 2159 || actionMasked == MotionEvent.ACTION_CANCEL; 2160 2161 // Update list of touch targets for pointer down, if needed. 2162 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 2163 TouchTarget newTouchTarget = null; 2164 boolean alreadyDispatchedToNewTouchTarget = false; 2165 if (!canceled && !intercepted) { 2166 if (actionMasked == MotionEvent.ACTION_DOWN 2167 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 2168 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2169 final int actionIndex = ev.getActionIndex(); // always 0 for down 2170 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 2171 : TouchTarget.ALL_POINTER_IDS; 2172 2173 // Clean up earlier touch targets for this pointer id in case they 2174 // have become out of sync. 2175 removePointersFromTouchTargets(idBitsToAssign); 2176 2177 final int childrenCount = mChildrenCount; 2178 if (newTouchTarget == null && childrenCount != 0) { 2179 final float x = ev.getX(actionIndex); 2180 final float y = ev.getY(actionIndex); 2181 // Find a child that can receive the event. 2182 // Scan children from front to back. 2183 final ArrayList<View> preorderedList = buildOrderedChildList(); 2184 final boolean customOrder = preorderedList == null 2185 && isChildrenDrawingOrderEnabled(); 2186 final View[] children = mChildren; 2187 for (int i = childrenCount - 1; i >= 0; i--) { 2188 final int childIndex = customOrder 2189 ? getChildDrawingOrder(childrenCount, i) : i; 2190 final View child = (preorderedList == null) 2191 ? children[childIndex] : preorderedList.get(childIndex); 2192 if (!canViewReceivePointerEvents(child) 2193 || !isTransformedTouchPointInView(x, y, child, null)) { 2194 continue; 2195 } 2196 2197 newTouchTarget = getTouchTarget(child); 2198 if (newTouchTarget != null) { 2199 // Child is already receiving touch within its bounds. 2200 // Give it the new pointer in addition to the ones it is handling. 2201 newTouchTarget.pointerIdBits |= idBitsToAssign; 2202 break; 2203 } 2204 2205 resetCancelNextUpFlag(child); 2206 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 2207 // Child wants to receive touch within its bounds. 2208 mLastTouchDownTime = ev.getDownTime(); 2209 if (preorderedList != null) { 2210 // childIndex points into presorted list, find original index 2211 for (int j = 0; j < childrenCount; j++) { 2212 if (children[childIndex] == mChildren[j]) { 2213 mLastTouchDownIndex = j; 2214 break; 2215 } 2216 } 2217 } else { 2218 mLastTouchDownIndex = childIndex; 2219 } 2220 mLastTouchDownX = ev.getX(); 2221 mLastTouchDownY = ev.getY(); 2222 newTouchTarget = addTouchTarget(child, idBitsToAssign); 2223 alreadyDispatchedToNewTouchTarget = true; 2224 break; 2225 } 2226 } 2227 if (preorderedList != null) preorderedList.clear(); 2228 } 2229 2230 if (newTouchTarget == null && mFirstTouchTarget != null) { 2231 // Did not find a child to receive the event. 2232 // Assign the pointer to the least recently added target. 2233 newTouchTarget = mFirstTouchTarget; 2234 while (newTouchTarget.next != null) { 2235 newTouchTarget = newTouchTarget.next; 2236 } 2237 newTouchTarget.pointerIdBits |= idBitsToAssign; 2238 } 2239 } 2240 } 2241 2242 // Dispatch to touch targets. 2243 if (mFirstTouchTarget == null) { 2244 // No touch targets so treat this as an ordinary view. 2245 handled = dispatchTransformedTouchEvent(ev, canceled, null, 2246 TouchTarget.ALL_POINTER_IDS); 2247 } else { 2248 // Dispatch to touch targets, excluding the new touch target if we already 2249 // dispatched to it. Cancel touch targets if necessary. 2250 TouchTarget predecessor = null; 2251 TouchTarget target = mFirstTouchTarget; 2252 while (target != null) { 2253 final TouchTarget next = target.next; 2254 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 2255 handled = true; 2256 } else { 2257 final boolean cancelChild = resetCancelNextUpFlag(target.child) 2258 || intercepted; 2259 if (dispatchTransformedTouchEvent(ev, cancelChild, 2260 target.child, target.pointerIdBits)) { 2261 handled = true; 2262 } 2263 if (cancelChild) { 2264 if (predecessor == null) { 2265 mFirstTouchTarget = next; 2266 } else { 2267 predecessor.next = next; 2268 } 2269 target.recycle(); 2270 target = next; 2271 continue; 2272 } 2273 } 2274 predecessor = target; 2275 target = next; 2276 } 2277 } 2278 2279 // Update list of touch targets for pointer up or cancel, if needed. 2280 if (canceled 2281 || actionMasked == MotionEvent.ACTION_UP 2282 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2283 resetTouchState(); 2284 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2285 final int actionIndex = ev.getActionIndex(); 2286 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2287 removePointersFromTouchTargets(idBitsToRemove); 2288 } 2289 } 2290 2291 if (!handled && mInputEventConsistencyVerifier != null) { 2292 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2293 } 2294 return handled; 2295 } 2296 2297 /** 2298 * Resets all touch state in preparation for a new cycle. 2299 */ 2300 private void resetTouchState() { 2301 clearTouchTargets(); 2302 resetCancelNextUpFlag(this); 2303 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2304 mNestedScrollAxes = SCROLL_AXIS_NONE; 2305 } 2306 2307 /** 2308 * Resets the cancel next up flag. 2309 * Returns true if the flag was previously set. 2310 */ 2311 private static boolean resetCancelNextUpFlag(View view) { 2312 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2313 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2314 return true; 2315 } 2316 return false; 2317 } 2318 2319 /** 2320 * Clears all touch targets. 2321 */ 2322 private void clearTouchTargets() { 2323 TouchTarget target = mFirstTouchTarget; 2324 if (target != null) { 2325 do { 2326 TouchTarget next = target.next; 2327 target.recycle(); 2328 target = next; 2329 } while (target != null); 2330 mFirstTouchTarget = null; 2331 } 2332 } 2333 2334 /** 2335 * Cancels and clears all touch targets. 2336 */ 2337 private void cancelAndClearTouchTargets(MotionEvent event) { 2338 if (mFirstTouchTarget != null) { 2339 boolean syntheticEvent = false; 2340 if (event == null) { 2341 final long now = SystemClock.uptimeMillis(); 2342 event = MotionEvent.obtain(now, now, 2343 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2344 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2345 syntheticEvent = true; 2346 } 2347 2348 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2349 resetCancelNextUpFlag(target.child); 2350 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2351 } 2352 clearTouchTargets(); 2353 2354 if (syntheticEvent) { 2355 event.recycle(); 2356 } 2357 } 2358 } 2359 2360 /** 2361 * Gets the touch target for specified child view. 2362 * Returns null if not found. 2363 */ 2364 private TouchTarget getTouchTarget(View child) { 2365 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2366 if (target.child == child) { 2367 return target; 2368 } 2369 } 2370 return null; 2371 } 2372 2373 /** 2374 * Adds a touch target for specified child to the beginning of the list. 2375 * Assumes the target child is not already present. 2376 */ 2377 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2378 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2379 target.next = mFirstTouchTarget; 2380 mFirstTouchTarget = target; 2381 return target; 2382 } 2383 2384 /** 2385 * Removes the pointer ids from consideration. 2386 */ 2387 private void removePointersFromTouchTargets(int pointerIdBits) { 2388 TouchTarget predecessor = null; 2389 TouchTarget target = mFirstTouchTarget; 2390 while (target != null) { 2391 final TouchTarget next = target.next; 2392 if ((target.pointerIdBits & pointerIdBits) != 0) { 2393 target.pointerIdBits &= ~pointerIdBits; 2394 if (target.pointerIdBits == 0) { 2395 if (predecessor == null) { 2396 mFirstTouchTarget = next; 2397 } else { 2398 predecessor.next = next; 2399 } 2400 target.recycle(); 2401 target = next; 2402 continue; 2403 } 2404 } 2405 predecessor = target; 2406 target = next; 2407 } 2408 } 2409 2410 private void cancelTouchTarget(View view) { 2411 TouchTarget predecessor = null; 2412 TouchTarget target = mFirstTouchTarget; 2413 while (target != null) { 2414 final TouchTarget next = target.next; 2415 if (target.child == view) { 2416 if (predecessor == null) { 2417 mFirstTouchTarget = next; 2418 } else { 2419 predecessor.next = next; 2420 } 2421 target.recycle(); 2422 2423 final long now = SystemClock.uptimeMillis(); 2424 MotionEvent event = MotionEvent.obtain(now, now, 2425 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2426 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2427 view.dispatchTouchEvent(event); 2428 event.recycle(); 2429 return; 2430 } 2431 predecessor = target; 2432 target = next; 2433 } 2434 } 2435 2436 /** 2437 * Returns true if a child view can receive pointer events. 2438 * @hide 2439 */ 2440 private static boolean canViewReceivePointerEvents(View child) { 2441 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2442 || child.getAnimation() != null; 2443 } 2444 2445 /** 2446 * Returns true if a child view contains the specified point when transformed 2447 * into its coordinate space. 2448 * Child must not be null. 2449 * @hide 2450 */ 2451 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2452 PointF outLocalPoint) { 2453 float localX = x + mScrollX - child.mLeft; 2454 float localY = y + mScrollY - child.mTop; 2455 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2456 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2457 localXY[0] = localX; 2458 localXY[1] = localY; 2459 child.getInverseMatrix().mapPoints(localXY); 2460 localX = localXY[0]; 2461 localY = localXY[1]; 2462 } 2463 final boolean isInView = child.pointInView(localX, localY); 2464 if (isInView && outLocalPoint != null) { 2465 outLocalPoint.set(localX, localY); 2466 } 2467 return isInView; 2468 } 2469 2470 /** 2471 * Transforms a motion event into the coordinate space of a particular child view, 2472 * filters out irrelevant pointer ids, and overrides its action if necessary. 2473 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2474 */ 2475 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2476 View child, int desiredPointerIdBits) { 2477 final boolean handled; 2478 2479 // Canceling motions is a special case. We don't need to perform any transformations 2480 // or filtering. The important part is the action, not the contents. 2481 final int oldAction = event.getAction(); 2482 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2483 event.setAction(MotionEvent.ACTION_CANCEL); 2484 if (child == null) { 2485 handled = super.dispatchTouchEvent(event); 2486 } else { 2487 handled = child.dispatchTouchEvent(event); 2488 } 2489 event.setAction(oldAction); 2490 return handled; 2491 } 2492 2493 // Calculate the number of pointers to deliver. 2494 final int oldPointerIdBits = event.getPointerIdBits(); 2495 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2496 2497 // If for some reason we ended up in an inconsistent state where it looks like we 2498 // might produce a motion event with no pointers in it, then drop the event. 2499 if (newPointerIdBits == 0) { 2500 return false; 2501 } 2502 2503 // If the number of pointers is the same and we don't need to perform any fancy 2504 // irreversible transformations, then we can reuse the motion event for this 2505 // dispatch as long as we are careful to revert any changes we make. 2506 // Otherwise we need to make a copy. 2507 final MotionEvent transformedEvent; 2508 if (newPointerIdBits == oldPointerIdBits) { 2509 if (child == null || child.hasIdentityMatrix()) { 2510 if (child == null) { 2511 handled = super.dispatchTouchEvent(event); 2512 } else { 2513 final float offsetX = mScrollX - child.mLeft; 2514 final float offsetY = mScrollY - child.mTop; 2515 event.offsetLocation(offsetX, offsetY); 2516 2517 handled = child.dispatchTouchEvent(event); 2518 2519 event.offsetLocation(-offsetX, -offsetY); 2520 } 2521 return handled; 2522 } 2523 transformedEvent = MotionEvent.obtain(event); 2524 } else { 2525 transformedEvent = event.split(newPointerIdBits); 2526 } 2527 2528 // Perform any necessary transformations and dispatch. 2529 if (child == null) { 2530 handled = super.dispatchTouchEvent(transformedEvent); 2531 } else { 2532 final float offsetX = mScrollX - child.mLeft; 2533 final float offsetY = mScrollY - child.mTop; 2534 transformedEvent.offsetLocation(offsetX, offsetY); 2535 if (! child.hasIdentityMatrix()) { 2536 transformedEvent.transform(child.getInverseMatrix()); 2537 } 2538 2539 handled = child.dispatchTouchEvent(transformedEvent); 2540 } 2541 2542 // Done. 2543 transformedEvent.recycle(); 2544 return handled; 2545 } 2546 2547 /** 2548 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2549 * dispatch. This behavior is enabled by default for applications that target an 2550 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2551 * 2552 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2553 * views depending on where each pointer initially went down. This allows for user interactions 2554 * such as scrolling two panes of content independently, chording of buttons, and performing 2555 * independent gestures on different pieces of content. 2556 * 2557 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2558 * child views. <code>false</code> to only allow one child view to be the target of 2559 * any MotionEvent received by this ViewGroup. 2560 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2561 */ 2562 public void setMotionEventSplittingEnabled(boolean split) { 2563 // TODO Applications really shouldn't change this setting mid-touch event, 2564 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2565 // with gestures in progress when this is changed. 2566 if (split) { 2567 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2568 } else { 2569 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2570 } 2571 } 2572 2573 /** 2574 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2575 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2576 */ 2577 public boolean isMotionEventSplittingEnabled() { 2578 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2579 } 2580 2581 /** 2582 * Returns true if this ViewGroup should be considered as a single entity for removal 2583 * when executing an Activity transition. If this is false, child elements will move 2584 * individually during the transition. 2585 * @return True if the ViewGroup should be acted on together during an Activity transition. 2586 * The default value is false when the background is null and true when the background 2587 * is not null or if {@link #getTransitionName()} is not null. 2588 */ 2589 public boolean isTransitionGroup() { 2590 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2591 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2592 } else { 2593 return getBackground() != null || getTransitionName() != null; 2594 } 2595 } 2596 2597 /** 2598 * Changes whether or not this ViewGroup should be treated as a single entity during 2599 * Activity Transitions. 2600 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2601 * in Activity transitions. If false, the ViewGroup won't transition, 2602 * only its children. If true, the entire ViewGroup will transition 2603 * together. 2604 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity, 2605 * android.util.Pair[]) 2606 */ 2607 public void setTransitionGroup(boolean isTransitionGroup) { 2608 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2609 if (isTransitionGroup) { 2610 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2611 } else { 2612 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2613 } 2614 } 2615 2616 /** 2617 * {@inheritDoc} 2618 */ 2619 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2620 2621 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2622 // We're already in this state, assume our ancestors are too 2623 return; 2624 } 2625 2626 if (disallowIntercept) { 2627 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2628 } else { 2629 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2630 } 2631 2632 // Pass it up to our parent 2633 if (mParent != null) { 2634 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2635 } 2636 } 2637 2638 /** 2639 * Implement this method to intercept all touch screen motion events. This 2640 * allows you to watch events as they are dispatched to your children, and 2641 * take ownership of the current gesture at any point. 2642 * 2643 * <p>Using this function takes some care, as it has a fairly complicated 2644 * interaction with {@link View#onTouchEvent(MotionEvent) 2645 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2646 * that method as well as this one in the correct way. Events will be 2647 * received in the following order: 2648 * 2649 * <ol> 2650 * <li> You will receive the down event here. 2651 * <li> The down event will be handled either by a child of this view 2652 * group, or given to your own onTouchEvent() method to handle; this means 2653 * you should implement onTouchEvent() to return true, so you will 2654 * continue to see the rest of the gesture (instead of looking for 2655 * a parent view to handle it). Also, by returning true from 2656 * onTouchEvent(), you will not receive any following 2657 * events in onInterceptTouchEvent() and all touch processing must 2658 * happen in onTouchEvent() like normal. 2659 * <li> For as long as you return false from this function, each following 2660 * event (up to and including the final up) will be delivered first here 2661 * and then to the target's onTouchEvent(). 2662 * <li> If you return true from here, you will not receive any 2663 * following events: the target view will receive the same event but 2664 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2665 * events will be delivered to your onTouchEvent() method and no longer 2666 * appear here. 2667 * </ol> 2668 * 2669 * @param ev The motion event being dispatched down the hierarchy. 2670 * @return Return true to steal motion events from the children and have 2671 * them dispatched to this ViewGroup through onTouchEvent(). 2672 * The current target will receive an ACTION_CANCEL event, and no further 2673 * messages will be delivered here. 2674 */ 2675 public boolean onInterceptTouchEvent(MotionEvent ev) { 2676 return false; 2677 } 2678 2679 /** 2680 * {@inheritDoc} 2681 * 2682 * Looks for a view to give focus to respecting the setting specified by 2683 * {@link #getDescendantFocusability()}. 2684 * 2685 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2686 * find focus within the children of this group when appropriate. 2687 * 2688 * @see #FOCUS_BEFORE_DESCENDANTS 2689 * @see #FOCUS_AFTER_DESCENDANTS 2690 * @see #FOCUS_BLOCK_DESCENDANTS 2691 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2692 */ 2693 @Override 2694 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2695 if (DBG) { 2696 System.out.println(this + " ViewGroup.requestFocus direction=" 2697 + direction); 2698 } 2699 int descendantFocusability = getDescendantFocusability(); 2700 2701 switch (descendantFocusability) { 2702 case FOCUS_BLOCK_DESCENDANTS: 2703 return super.requestFocus(direction, previouslyFocusedRect); 2704 case FOCUS_BEFORE_DESCENDANTS: { 2705 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2706 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2707 } 2708 case FOCUS_AFTER_DESCENDANTS: { 2709 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2710 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2711 } 2712 default: 2713 throw new IllegalStateException("descendant focusability must be " 2714 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2715 + "but is " + descendantFocusability); 2716 } 2717 } 2718 2719 /** 2720 * Look for a descendant to call {@link View#requestFocus} on. 2721 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2722 * when it wants to request focus within its children. Override this to 2723 * customize how your {@link ViewGroup} requests focus within its children. 2724 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2725 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2726 * to give a finer grained hint about where focus is coming from. May be null 2727 * if there is no hint. 2728 * @return Whether focus was taken. 2729 */ 2730 @SuppressWarnings({"ConstantConditions"}) 2731 protected boolean onRequestFocusInDescendants(int direction, 2732 Rect previouslyFocusedRect) { 2733 int index; 2734 int increment; 2735 int end; 2736 int count = mChildrenCount; 2737 if ((direction & FOCUS_FORWARD) != 0) { 2738 index = 0; 2739 increment = 1; 2740 end = count; 2741 } else { 2742 index = count - 1; 2743 increment = -1; 2744 end = -1; 2745 } 2746 final View[] children = mChildren; 2747 for (int i = index; i != end; i += increment) { 2748 View child = children[i]; 2749 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2750 if (child.requestFocus(direction, previouslyFocusedRect)) { 2751 return true; 2752 } 2753 } 2754 } 2755 return false; 2756 } 2757 2758 /** 2759 * {@inheritDoc} 2760 * 2761 * @hide 2762 */ 2763 @Override 2764 public void dispatchStartTemporaryDetach() { 2765 super.dispatchStartTemporaryDetach(); 2766 final int count = mChildrenCount; 2767 final View[] children = mChildren; 2768 for (int i = 0; i < count; i++) { 2769 children[i].dispatchStartTemporaryDetach(); 2770 } 2771 } 2772 2773 /** 2774 * {@inheritDoc} 2775 * 2776 * @hide 2777 */ 2778 @Override 2779 public void dispatchFinishTemporaryDetach() { 2780 super.dispatchFinishTemporaryDetach(); 2781 final int count = mChildrenCount; 2782 final View[] children = mChildren; 2783 for (int i = 0; i < count; i++) { 2784 children[i].dispatchFinishTemporaryDetach(); 2785 } 2786 } 2787 2788 /** 2789 * {@inheritDoc} 2790 */ 2791 @Override 2792 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2793 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2794 super.dispatchAttachedToWindow(info, visibility); 2795 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2796 2797 final int count = mChildrenCount; 2798 final View[] children = mChildren; 2799 for (int i = 0; i < count; i++) { 2800 final View child = children[i]; 2801 child.dispatchAttachedToWindow(info, 2802 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2803 } 2804 } 2805 2806 @Override 2807 void dispatchScreenStateChanged(int screenState) { 2808 super.dispatchScreenStateChanged(screenState); 2809 2810 final int count = mChildrenCount; 2811 final View[] children = mChildren; 2812 for (int i = 0; i < count; i++) { 2813 children[i].dispatchScreenStateChanged(screenState); 2814 } 2815 } 2816 2817 @Override 2818 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2819 boolean handled = false; 2820 if (includeForAccessibility()) { 2821 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2822 if (handled) { 2823 return handled; 2824 } 2825 } 2826 // Let our children have a shot in populating the event. 2827 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2828 try { 2829 final int childCount = children.getChildCount(); 2830 for (int i = 0; i < childCount; i++) { 2831 View child = children.getChildAt(i); 2832 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2833 handled = child.dispatchPopulateAccessibilityEvent(event); 2834 if (handled) { 2835 return handled; 2836 } 2837 } 2838 } 2839 } finally { 2840 children.recycle(); 2841 } 2842 return false; 2843 } 2844 2845 @Override 2846 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2847 super.onInitializeAccessibilityNodeInfoInternal(info); 2848 if (mAttachInfo != null) { 2849 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2850 childrenForAccessibility.clear(); 2851 addChildrenForAccessibility(childrenForAccessibility); 2852 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2853 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2854 final View child = childrenForAccessibility.get(i); 2855 info.addChildUnchecked(child); 2856 } 2857 childrenForAccessibility.clear(); 2858 } 2859 } 2860 2861 @Override 2862 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2863 super.onInitializeAccessibilityEventInternal(event); 2864 event.setClassName(ViewGroup.class.getName()); 2865 } 2866 2867 @Override 2868 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2869 // If this is a live region, we should send a subtree change event 2870 // from this view. Otherwise, we can let it propagate up. 2871 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2872 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2873 } else if (mParent != null) { 2874 try { 2875 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2876 } catch (AbstractMethodError e) { 2877 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2878 " does not fully implement ViewParent", e); 2879 } 2880 } 2881 } 2882 2883 @Override 2884 void resetSubtreeAccessibilityStateChanged() { 2885 super.resetSubtreeAccessibilityStateChanged(); 2886 View[] children = mChildren; 2887 final int childCount = mChildrenCount; 2888 for (int i = 0; i < childCount; i++) { 2889 children[i].resetSubtreeAccessibilityStateChanged(); 2890 } 2891 } 2892 2893 /** 2894 * {@inheritDoc} 2895 */ 2896 @Override 2897 void dispatchDetachedFromWindow() { 2898 // If we still have a touch target, we are still in the process of 2899 // dispatching motion events to a child; we need to get rid of that 2900 // child to avoid dispatching events to it after the window is torn 2901 // down. To make sure we keep the child in a consistent state, we 2902 // first send it an ACTION_CANCEL motion event. 2903 cancelAndClearTouchTargets(null); 2904 2905 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2906 exitHoverTargets(); 2907 2908 // In case view is detached while transition is running 2909 mLayoutCalledWhileSuppressed = false; 2910 2911 // Tear down our drag tracking 2912 mDragNotifiedChildren = null; 2913 if (mCurrentDrag != null) { 2914 mCurrentDrag.recycle(); 2915 mCurrentDrag = null; 2916 } 2917 2918 final int count = mChildrenCount; 2919 final View[] children = mChildren; 2920 for (int i = 0; i < count; i++) { 2921 children[i].dispatchDetachedFromWindow(); 2922 } 2923 clearDisappearingChildren(); 2924 super.dispatchDetachedFromWindow(); 2925 } 2926 2927 /** 2928 * @hide 2929 */ 2930 @Override 2931 protected void internalSetPadding(int left, int top, int right, int bottom) { 2932 super.internalSetPadding(left, top, right, bottom); 2933 2934 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2935 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2936 } else { 2937 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2938 } 2939 } 2940 2941 /** 2942 * {@inheritDoc} 2943 */ 2944 @Override 2945 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2946 super.dispatchSaveInstanceState(container); 2947 final int count = mChildrenCount; 2948 final View[] children = mChildren; 2949 for (int i = 0; i < count; i++) { 2950 View c = children[i]; 2951 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2952 c.dispatchSaveInstanceState(container); 2953 } 2954 } 2955 } 2956 2957 /** 2958 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2959 * to only this view, not to its children. For use when overriding 2960 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2961 * subclasses to freeze their own state but not the state of their children. 2962 * 2963 * @param container the container 2964 */ 2965 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2966 super.dispatchSaveInstanceState(container); 2967 } 2968 2969 /** 2970 * {@inheritDoc} 2971 */ 2972 @Override 2973 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2974 super.dispatchRestoreInstanceState(container); 2975 final int count = mChildrenCount; 2976 final View[] children = mChildren; 2977 for (int i = 0; i < count; i++) { 2978 View c = children[i]; 2979 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2980 c.dispatchRestoreInstanceState(container); 2981 } 2982 } 2983 } 2984 2985 /** 2986 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2987 * to only this view, not to its children. For use when overriding 2988 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2989 * subclasses to thaw their own state but not the state of their children. 2990 * 2991 * @param container the container 2992 */ 2993 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2994 super.dispatchRestoreInstanceState(container); 2995 } 2996 2997 /** 2998 * Enables or disables the drawing cache for each child of this view group. 2999 * 3000 * @param enabled true to enable the cache, false to dispose of it 3001 */ 3002 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 3003 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 3004 final View[] children = mChildren; 3005 final int count = mChildrenCount; 3006 for (int i = 0; i < count; i++) { 3007 children[i].setDrawingCacheEnabled(enabled); 3008 } 3009 } 3010 } 3011 3012 @Override 3013 protected void onAnimationStart() { 3014 super.onAnimationStart(); 3015 3016 // When this ViewGroup's animation starts, build the cache for the children 3017 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3018 final int count = mChildrenCount; 3019 final View[] children = mChildren; 3020 final boolean buildCache = !isHardwareAccelerated(); 3021 3022 for (int i = 0; i < count; i++) { 3023 final View child = children[i]; 3024 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3025 child.setDrawingCacheEnabled(true); 3026 if (buildCache) { 3027 child.buildDrawingCache(true); 3028 } 3029 } 3030 } 3031 3032 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3033 } 3034 } 3035 3036 @Override 3037 protected void onAnimationEnd() { 3038 super.onAnimationEnd(); 3039 3040 // When this ViewGroup's animation ends, destroy the cache of the children 3041 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3042 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3043 3044 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3045 setChildrenDrawingCacheEnabled(false); 3046 } 3047 } 3048 } 3049 3050 @Override 3051 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 3052 int count = mChildrenCount; 3053 int[] visibilities = null; 3054 3055 if (skipChildren) { 3056 visibilities = new int[count]; 3057 for (int i = 0; i < count; i++) { 3058 View child = getChildAt(i); 3059 visibilities[i] = child.getVisibility(); 3060 if (visibilities[i] == View.VISIBLE) { 3061 child.setVisibility(INVISIBLE); 3062 } 3063 } 3064 } 3065 3066 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 3067 3068 if (skipChildren) { 3069 for (int i = 0; i < count; i++) { 3070 getChildAt(i).setVisibility(visibilities[i]); 3071 } 3072 } 3073 3074 return b; 3075 } 3076 3077 /** Return true if this ViewGroup is laying out using optical bounds. */ 3078 boolean isLayoutModeOptical() { 3079 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 3080 } 3081 3082 Insets computeOpticalInsets() { 3083 if (isLayoutModeOptical()) { 3084 int left = 0; 3085 int top = 0; 3086 int right = 0; 3087 int bottom = 0; 3088 for (int i = 0; i < mChildrenCount; i++) { 3089 View child = getChildAt(i); 3090 if (child.getVisibility() == VISIBLE) { 3091 Insets insets = child.getOpticalInsets(); 3092 left = Math.max(left, insets.left); 3093 top = Math.max(top, insets.top); 3094 right = Math.max(right, insets.right); 3095 bottom = Math.max(bottom, insets.bottom); 3096 } 3097 } 3098 return Insets.of(left, top, right, bottom); 3099 } else { 3100 return Insets.NONE; 3101 } 3102 } 3103 3104 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 3105 if (x1 != x2 && y1 != y2) { 3106 if (x1 > x2) { 3107 int tmp = x1; x1 = x2; x2 = tmp; 3108 } 3109 if (y1 > y2) { 3110 int tmp = y1; y1 = y2; y2 = tmp; 3111 } 3112 canvas.drawRect(x1, y1, x2, y2, paint); 3113 } 3114 } 3115 3116 private static int sign(int x) { 3117 return (x >= 0) ? 1 : -1; 3118 } 3119 3120 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 3121 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 3122 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 3123 } 3124 3125 private int dipsToPixels(int dips) { 3126 float scale = getContext().getResources().getDisplayMetrics().density; 3127 return (int) (dips * scale + 0.5f); 3128 } 3129 3130 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 3131 int lineLength, int lineWidth) { 3132 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 3133 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 3134 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 3135 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 3136 } 3137 3138 private static void fillDifference(Canvas canvas, 3139 int x2, int y2, int x3, int y3, 3140 int dx1, int dy1, int dx2, int dy2, Paint paint) { 3141 int x1 = x2 - dx1; 3142 int y1 = y2 - dy1; 3143 3144 int x4 = x3 + dx2; 3145 int y4 = y3 + dy2; 3146 3147 fillRect(canvas, paint, x1, y1, x4, y2); 3148 fillRect(canvas, paint, x1, y2, x2, y3); 3149 fillRect(canvas, paint, x3, y2, x4, y3); 3150 fillRect(canvas, paint, x1, y3, x4, y4); 3151 } 3152 3153 /** 3154 * @hide 3155 */ 3156 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 3157 for (int i = 0; i < getChildCount(); i++) { 3158 View c = getChildAt(i); 3159 c.getLayoutParams().onDebugDraw(c, canvas, paint); 3160 } 3161 } 3162 3163 /** 3164 * @hide 3165 */ 3166 protected void onDebugDraw(Canvas canvas) { 3167 Paint paint = getDebugPaint(); 3168 3169 // Draw optical bounds 3170 { 3171 paint.setColor(Color.RED); 3172 paint.setStyle(Paint.Style.STROKE); 3173 3174 for (int i = 0; i < getChildCount(); i++) { 3175 View c = getChildAt(i); 3176 Insets insets = c.getOpticalInsets(); 3177 3178 drawRect(canvas, paint, 3179 c.getLeft() + insets.left, 3180 c.getTop() + insets.top, 3181 c.getRight() - insets.right - 1, 3182 c.getBottom() - insets.bottom - 1); 3183 } 3184 } 3185 3186 // Draw margins 3187 { 3188 paint.setColor(Color.argb(63, 255, 0, 255)); 3189 paint.setStyle(Paint.Style.FILL); 3190 3191 onDebugDrawMargins(canvas, paint); 3192 } 3193 3194 // Draw clip bounds 3195 { 3196 paint.setColor(Color.rgb(63, 127, 255)); 3197 paint.setStyle(Paint.Style.FILL); 3198 3199 int lineLength = dipsToPixels(8); 3200 int lineWidth = dipsToPixels(1); 3201 for (int i = 0; i < getChildCount(); i++) { 3202 View c = getChildAt(i); 3203 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 3204 paint, lineLength, lineWidth); 3205 } 3206 } 3207 } 3208 3209 /** 3210 * {@inheritDoc} 3211 */ 3212 @Override 3213 protected void dispatchDraw(Canvas canvas) { 3214 boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode); 3215 final int childrenCount = mChildrenCount; 3216 final View[] children = mChildren; 3217 int flags = mGroupFlags; 3218 3219 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 3220 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3221 3222 final boolean buildCache = !isHardwareAccelerated(); 3223 for (int i = 0; i < childrenCount; i++) { 3224 final View child = children[i]; 3225 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3226 final LayoutParams params = child.getLayoutParams(); 3227 attachLayoutAnimationParameters(child, params, i, childrenCount); 3228 bindLayoutAnimation(child); 3229 if (cache) { 3230 child.setDrawingCacheEnabled(true); 3231 if (buildCache) { 3232 child.buildDrawingCache(true); 3233 } 3234 } 3235 } 3236 } 3237 3238 final LayoutAnimationController controller = mLayoutAnimationController; 3239 if (controller.willOverlap()) { 3240 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 3241 } 3242 3243 controller.start(); 3244 3245 mGroupFlags &= ~FLAG_RUN_ANIMATION; 3246 mGroupFlags &= ~FLAG_ANIMATION_DONE; 3247 3248 if (cache) { 3249 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3250 } 3251 3252 if (mAnimationListener != null) { 3253 mAnimationListener.onAnimationStart(controller.getAnimation()); 3254 } 3255 } 3256 3257 int clipSaveCount = 0; 3258 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3259 if (clipToPadding) { 3260 clipSaveCount = canvas.save(); 3261 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 3262 mScrollX + mRight - mLeft - mPaddingRight, 3263 mScrollY + mBottom - mTop - mPaddingBottom); 3264 } 3265 3266 // We will draw our child's animation, let's reset the flag 3267 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 3268 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 3269 3270 boolean more = false; 3271 final long drawingTime = getDrawingTime(); 3272 3273 if (usingRenderNodeProperties) canvas.insertReorderBarrier(); 3274 // Only use the preordered list if not HW accelerated, since the HW pipeline will do the 3275 // draw reordering internally 3276 final ArrayList<View> preorderedList = usingRenderNodeProperties 3277 ? null : buildOrderedChildList(); 3278 final boolean customOrder = preorderedList == null 3279 && isChildrenDrawingOrderEnabled(); 3280 for (int i = 0; i < childrenCount; i++) { 3281 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 3282 final View child = (preorderedList == null) 3283 ? children[childIndex] : preorderedList.get(childIndex); 3284 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 3285 more |= drawChild(canvas, child, drawingTime); 3286 } 3287 } 3288 if (preorderedList != null) preorderedList.clear(); 3289 3290 // Draw any disappearing views that have animations 3291 if (mDisappearingChildren != null) { 3292 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3293 final int disappearingCount = disappearingChildren.size() - 1; 3294 // Go backwards -- we may delete as animations finish 3295 for (int i = disappearingCount; i >= 0; i--) { 3296 final View child = disappearingChildren.get(i); 3297 more |= drawChild(canvas, child, drawingTime); 3298 } 3299 } 3300 if (usingRenderNodeProperties) canvas.insertInorderBarrier(); 3301 3302 if (debugDraw()) { 3303 onDebugDraw(canvas); 3304 } 3305 3306 if (clipToPadding) { 3307 canvas.restoreToCount(clipSaveCount); 3308 } 3309 3310 // mGroupFlags might have been updated by drawChild() 3311 flags = mGroupFlags; 3312 3313 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3314 invalidate(true); 3315 } 3316 3317 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3318 mLayoutAnimationController.isDone() && !more) { 3319 // We want to erase the drawing cache and notify the listener after the 3320 // next frame is drawn because one extra invalidate() is caused by 3321 // drawChild() after the animation is over 3322 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3323 final Runnable end = new Runnable() { 3324 public void run() { 3325 notifyAnimationListener(); 3326 } 3327 }; 3328 post(end); 3329 } 3330 } 3331 3332 /** 3333 * Returns the ViewGroupOverlay for this view group, creating it if it does 3334 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3335 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3336 * views, like overlay drawables, are visual-only; they do not receive input 3337 * events and should not be used as anything other than a temporary 3338 * representation of a view in a parent container, such as might be used 3339 * by an animation effect. 3340 * 3341 * <p>Note: Overlays do not currently work correctly with {@link 3342 * SurfaceView} or {@link TextureView}; contents in overlays for these 3343 * types of views may not display correctly.</p> 3344 * 3345 * @return The ViewGroupOverlay object for this view. 3346 * @see ViewGroupOverlay 3347 */ 3348 @Override 3349 public ViewGroupOverlay getOverlay() { 3350 if (mOverlay == null) { 3351 mOverlay = new ViewGroupOverlay(mContext, this); 3352 } 3353 return (ViewGroupOverlay) mOverlay; 3354 } 3355 3356 /** 3357 * Returns the index of the child to draw for this iteration. Override this 3358 * if you want to change the drawing order of children. By default, it 3359 * returns i. 3360 * <p> 3361 * NOTE: In order for this method to be called, you must enable child ordering 3362 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3363 * 3364 * @param i The current iteration. 3365 * @return The index of the child to draw this iteration. 3366 * 3367 * @see #setChildrenDrawingOrderEnabled(boolean) 3368 * @see #isChildrenDrawingOrderEnabled() 3369 */ 3370 protected int getChildDrawingOrder(int childCount, int i) { 3371 return i; 3372 } 3373 3374 private boolean hasChildWithZ() { 3375 for (int i = 0; i < mChildrenCount; i++) { 3376 if (mChildren[i].getZ() != 0) return true; 3377 } 3378 return false; 3379 } 3380 3381 /** 3382 * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children, 3383 * sorted first by Z, then by child drawing order (if applicable). This list must be cleared 3384 * after use to avoid leaking child Views. 3385 * 3386 * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated 3387 * children. 3388 */ 3389 ArrayList<View> buildOrderedChildList() { 3390 final int count = mChildrenCount; 3391 if (count <= 1 || !hasChildWithZ()) return null; 3392 3393 if (mPreSortedChildren == null) { 3394 mPreSortedChildren = new ArrayList<View>(count); 3395 } else { 3396 mPreSortedChildren.ensureCapacity(count); 3397 } 3398 3399 final boolean useCustomOrder = isChildrenDrawingOrderEnabled(); 3400 for (int i = 0; i < mChildrenCount; i++) { 3401 // add next child (in child order) to end of list 3402 int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i; 3403 View nextChild = mChildren[childIndex]; 3404 float currentZ = nextChild.getZ(); 3405 3406 // insert ahead of any Views with greater Z 3407 int insertIndex = i; 3408 while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) { 3409 insertIndex--; 3410 } 3411 mPreSortedChildren.add(insertIndex, nextChild); 3412 } 3413 return mPreSortedChildren; 3414 } 3415 3416 private void notifyAnimationListener() { 3417 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3418 mGroupFlags |= FLAG_ANIMATION_DONE; 3419 3420 if (mAnimationListener != null) { 3421 final Runnable end = new Runnable() { 3422 public void run() { 3423 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3424 } 3425 }; 3426 post(end); 3427 } 3428 3429 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3430 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3431 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3432 setChildrenDrawingCacheEnabled(false); 3433 } 3434 } 3435 3436 invalidate(true); 3437 } 3438 3439 /** 3440 * This method is used to cause children of this ViewGroup to restore or recreate their 3441 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3442 * to recreate its own display list, which would happen if it went through the normal 3443 * draw/dispatchDraw mechanisms. 3444 * 3445 * @hide 3446 */ 3447 @Override 3448 protected void dispatchGetDisplayList() { 3449 final int count = mChildrenCount; 3450 final View[] children = mChildren; 3451 for (int i = 0; i < count; i++) { 3452 final View child = children[i]; 3453 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3454 child.hasStaticLayer()) { 3455 recreateChildDisplayList(child); 3456 } 3457 } 3458 if (mOverlay != null) { 3459 View overlayView = mOverlay.getOverlayView(); 3460 recreateChildDisplayList(overlayView); 3461 } 3462 if (mDisappearingChildren != null) { 3463 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3464 final int disappearingCount = disappearingChildren.size(); 3465 for (int i = 0; i < disappearingCount; ++i) { 3466 final View child = disappearingChildren.get(i); 3467 recreateChildDisplayList(child); 3468 } 3469 } 3470 } 3471 3472 private void recreateChildDisplayList(View child) { 3473 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3474 == PFLAG_INVALIDATED; 3475 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3476 child.getDisplayList(); 3477 child.mRecreateDisplayList = false; 3478 } 3479 3480 /** 3481 * Draw one child of this View Group. This method is responsible for getting 3482 * the canvas in the right state. This includes clipping, translating so 3483 * that the child's scrolled origin is at 0, 0, and applying any animation 3484 * transformations. 3485 * 3486 * @param canvas The canvas on which to draw the child 3487 * @param child Who to draw 3488 * @param drawingTime The time at which draw is occurring 3489 * @return True if an invalidate() was issued 3490 */ 3491 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3492 return child.draw(canvas, this, drawingTime); 3493 } 3494 3495 /** 3496 * Returns whether this group's children are clipped to their bounds before drawing. 3497 * The default value is true. 3498 * @see #setClipChildren(boolean) 3499 * 3500 * @return True if the group's children will be clipped to their bounds, 3501 * false otherwise. 3502 */ 3503 @ViewDebug.ExportedProperty(category = "drawing") 3504 public boolean getClipChildren() { 3505 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3506 } 3507 3508 /** 3509 * By default, children are clipped to their bounds before drawing. This 3510 * allows view groups to override this behavior for animations, etc. 3511 * 3512 * @param clipChildren true to clip children to their bounds, 3513 * false otherwise 3514 * @attr ref android.R.styleable#ViewGroup_clipChildren 3515 */ 3516 public void setClipChildren(boolean clipChildren) { 3517 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3518 if (clipChildren != previousValue) { 3519 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3520 for (int i = 0; i < mChildrenCount; ++i) { 3521 View child = getChildAt(i); 3522 if (child.mRenderNode != null) { 3523 child.mRenderNode.setClipToBounds(clipChildren); 3524 } 3525 } 3526 invalidate(true); 3527 } 3528 } 3529 3530 /** 3531 * By default, children are clipped to the padding of the ViewGroup. This 3532 * allows view groups to override this behavior 3533 * 3534 * @param clipToPadding true to clip children to the padding of the 3535 * group, false otherwise 3536 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3537 */ 3538 public void setClipToPadding(boolean clipToPadding) { 3539 if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) { 3540 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3541 invalidate(true); 3542 } 3543 } 3544 3545 /** 3546 * Check if this ViewGroup is configured to clip child views to its padding. 3547 * 3548 * @return true if this ViewGroup clips children to its padding, false otherwise 3549 * 3550 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3551 */ 3552 @ViewDebug.ExportedProperty(category = "drawing") 3553 public boolean getClipToPadding() { 3554 return hasBooleanFlag(FLAG_CLIP_TO_PADDING); 3555 } 3556 3557 /** 3558 * {@inheritDoc} 3559 */ 3560 @Override 3561 public void dispatchSetSelected(boolean selected) { 3562 final View[] children = mChildren; 3563 final int count = mChildrenCount; 3564 for (int i = 0; i < count; i++) { 3565 children[i].setSelected(selected); 3566 } 3567 } 3568 3569 /** 3570 * {@inheritDoc} 3571 */ 3572 @Override 3573 public void dispatchSetActivated(boolean activated) { 3574 final View[] children = mChildren; 3575 final int count = mChildrenCount; 3576 for (int i = 0; i < count; i++) { 3577 children[i].setActivated(activated); 3578 } 3579 } 3580 3581 @Override 3582 protected void dispatchSetPressed(boolean pressed) { 3583 final View[] children = mChildren; 3584 final int count = mChildrenCount; 3585 for (int i = 0; i < count; i++) { 3586 final View child = children[i]; 3587 // Children that are clickable on their own should not 3588 // show a pressed state when their parent view does. 3589 // Clearing a pressed state always propagates. 3590 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3591 child.setPressed(pressed); 3592 } 3593 } 3594 } 3595 3596 @Override 3597 void dispatchCancelPendingInputEvents() { 3598 super.dispatchCancelPendingInputEvents(); 3599 3600 final View[] children = mChildren; 3601 final int count = mChildrenCount; 3602 for (int i = 0; i < count; i++) { 3603 children[i].dispatchCancelPendingInputEvents(); 3604 } 3605 } 3606 3607 /** 3608 * When this property is set to true, this ViewGroup supports static transformations on 3609 * children; this causes 3610 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3611 * invoked when a child is drawn. 3612 * 3613 * Any subclass overriding 3614 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3615 * set this property to true. 3616 * 3617 * @param enabled True to enable static transformations on children, false otherwise. 3618 * 3619 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3620 */ 3621 protected void setStaticTransformationsEnabled(boolean enabled) { 3622 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3623 } 3624 3625 /** 3626 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3627 * boolean to indicate whether a static transform was set. The default implementation 3628 * simply returns <code>false</code>; subclasses may override this method for different 3629 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3630 * for this method to be called. 3631 * 3632 * @param child The child view whose static transform is being requested 3633 * @param t The Transformation which will hold the result 3634 * @return true if the transformation was set, false otherwise 3635 * @see #setStaticTransformationsEnabled(boolean) 3636 */ 3637 protected boolean getChildStaticTransformation(View child, Transformation t) { 3638 return false; 3639 } 3640 3641 Transformation getChildTransformation() { 3642 if (mChildTransformation == null) { 3643 mChildTransformation = new Transformation(); 3644 } 3645 return mChildTransformation; 3646 } 3647 3648 /** 3649 * {@hide} 3650 */ 3651 @Override 3652 protected View findViewTraversal(int id) { 3653 if (id == mID) { 3654 return this; 3655 } 3656 3657 final View[] where = mChildren; 3658 final int len = mChildrenCount; 3659 3660 for (int i = 0; i < len; i++) { 3661 View v = where[i]; 3662 3663 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3664 v = v.findViewById(id); 3665 3666 if (v != null) { 3667 return v; 3668 } 3669 } 3670 } 3671 3672 return null; 3673 } 3674 3675 /** 3676 * {@hide} 3677 */ 3678 @Override 3679 protected View findViewWithTagTraversal(Object tag) { 3680 if (tag != null && tag.equals(mTag)) { 3681 return this; 3682 } 3683 3684 final View[] where = mChildren; 3685 final int len = mChildrenCount; 3686 3687 for (int i = 0; i < len; i++) { 3688 View v = where[i]; 3689 3690 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3691 v = v.findViewWithTag(tag); 3692 3693 if (v != null) { 3694 return v; 3695 } 3696 } 3697 } 3698 3699 return null; 3700 } 3701 3702 /** 3703 * {@hide} 3704 */ 3705 @Override 3706 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3707 if (predicate.apply(this)) { 3708 return this; 3709 } 3710 3711 final View[] where = mChildren; 3712 final int len = mChildrenCount; 3713 3714 for (int i = 0; i < len; i++) { 3715 View v = where[i]; 3716 3717 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3718 v = v.findViewByPredicate(predicate); 3719 3720 if (v != null) { 3721 return v; 3722 } 3723 } 3724 } 3725 3726 return null; 3727 } 3728 3729 /** 3730 * <p>Adds a child view. If no layout parameters are already set on the child, the 3731 * default parameters for this ViewGroup are set on the child.</p> 3732 * 3733 * <p><strong>Note:</strong> do not invoke this method from 3734 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3735 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3736 * 3737 * @param child the child view to add 3738 * 3739 * @see #generateDefaultLayoutParams() 3740 */ 3741 public void addView(View child) { 3742 addView(child, -1); 3743 } 3744 3745 /** 3746 * Adds a child view. If no layout parameters are already set on the child, the 3747 * default parameters for this ViewGroup are set on the child. 3748 * 3749 * <p><strong>Note:</strong> do not invoke this method from 3750 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3751 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3752 * 3753 * @param child the child view to add 3754 * @param index the position at which to add the child 3755 * 3756 * @see #generateDefaultLayoutParams() 3757 */ 3758 public void addView(View child, int index) { 3759 if (child == null) { 3760 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3761 } 3762 LayoutParams params = child.getLayoutParams(); 3763 if (params == null) { 3764 params = generateDefaultLayoutParams(); 3765 if (params == null) { 3766 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3767 } 3768 } 3769 addView(child, index, params); 3770 } 3771 3772 /** 3773 * Adds a child view with this ViewGroup's default layout parameters and the 3774 * specified width and height. 3775 * 3776 * <p><strong>Note:</strong> do not invoke this method from 3777 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3778 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3779 * 3780 * @param child the child view to add 3781 */ 3782 public void addView(View child, int width, int height) { 3783 final LayoutParams params = generateDefaultLayoutParams(); 3784 params.width = width; 3785 params.height = height; 3786 addView(child, -1, params); 3787 } 3788 3789 /** 3790 * Adds a child view with the specified layout parameters. 3791 * 3792 * <p><strong>Note:</strong> do not invoke this method from 3793 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3794 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3795 * 3796 * @param child the child view to add 3797 * @param params the layout parameters to set on the child 3798 */ 3799 public void addView(View child, LayoutParams params) { 3800 addView(child, -1, params); 3801 } 3802 3803 /** 3804 * Adds a child view with the specified layout parameters. 3805 * 3806 * <p><strong>Note:</strong> do not invoke this method from 3807 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3808 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3809 * 3810 * @param child the child view to add 3811 * @param index the position at which to add the child 3812 * @param params the layout parameters to set on the child 3813 */ 3814 public void addView(View child, int index, LayoutParams params) { 3815 if (DBG) { 3816 System.out.println(this + " addView"); 3817 } 3818 3819 if (child == null) { 3820 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3821 } 3822 3823 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3824 // therefore, we call requestLayout() on ourselves before, so that the child's request 3825 // will be blocked at our level 3826 requestLayout(); 3827 invalidate(true); 3828 addViewInner(child, index, params, false); 3829 } 3830 3831 /** 3832 * {@inheritDoc} 3833 */ 3834 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3835 if (!checkLayoutParams(params)) { 3836 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3837 } 3838 if (view.mParent != this) { 3839 throw new IllegalArgumentException("Given view not a child of " + this); 3840 } 3841 view.setLayoutParams(params); 3842 } 3843 3844 /** 3845 * {@inheritDoc} 3846 */ 3847 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3848 return p != null; 3849 } 3850 3851 /** 3852 * Interface definition for a callback to be invoked when the hierarchy 3853 * within this view changed. The hierarchy changes whenever a child is added 3854 * to or removed from this view. 3855 */ 3856 public interface OnHierarchyChangeListener { 3857 /** 3858 * Called when a new child is added to a parent view. 3859 * 3860 * @param parent the view in which a child was added 3861 * @param child the new child view added in the hierarchy 3862 */ 3863 void onChildViewAdded(View parent, View child); 3864 3865 /** 3866 * Called when a child is removed from a parent view. 3867 * 3868 * @param parent the view from which the child was removed 3869 * @param child the child removed from the hierarchy 3870 */ 3871 void onChildViewRemoved(View parent, View child); 3872 } 3873 3874 /** 3875 * Register a callback to be invoked when a child is added to or removed 3876 * from this view. 3877 * 3878 * @param listener the callback to invoke on hierarchy change 3879 */ 3880 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3881 mOnHierarchyChangeListener = listener; 3882 } 3883 3884 /** 3885 * @hide 3886 */ 3887 protected void onViewAdded(View child) { 3888 if (mOnHierarchyChangeListener != null) { 3889 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3890 } 3891 } 3892 3893 /** 3894 * @hide 3895 */ 3896 protected void onViewRemoved(View child) { 3897 if (mOnHierarchyChangeListener != null) { 3898 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3899 } 3900 } 3901 3902 private void clearCachedLayoutMode() { 3903 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3904 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3905 } 3906 } 3907 3908 @Override 3909 protected void onAttachedToWindow() { 3910 super.onAttachedToWindow(); 3911 clearCachedLayoutMode(); 3912 } 3913 3914 @Override 3915 protected void onDetachedFromWindow() { 3916 super.onDetachedFromWindow(); 3917 clearCachedLayoutMode(); 3918 } 3919 3920 /** 3921 * Adds a view during layout. This is useful if in your onLayout() method, 3922 * you need to add more views (as does the list view for example). 3923 * 3924 * If index is negative, it means put it at the end of the list. 3925 * 3926 * @param child the view to add to the group 3927 * @param index the index at which the child must be added 3928 * @param params the layout parameters to associate with the child 3929 * @return true if the child was added, false otherwise 3930 */ 3931 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3932 return addViewInLayout(child, index, params, false); 3933 } 3934 3935 /** 3936 * Adds a view during layout. This is useful if in your onLayout() method, 3937 * you need to add more views (as does the list view for example). 3938 * 3939 * If index is negative, it means put it at the end of the list. 3940 * 3941 * @param child the view to add to the group 3942 * @param index the index at which the child must be added 3943 * @param params the layout parameters to associate with the child 3944 * @param preventRequestLayout if true, calling this method will not trigger a 3945 * layout request on child 3946 * @return true if the child was added, false otherwise 3947 */ 3948 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3949 boolean preventRequestLayout) { 3950 if (child == null) { 3951 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3952 } 3953 child.mParent = null; 3954 addViewInner(child, index, params, preventRequestLayout); 3955 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3956 return true; 3957 } 3958 3959 /** 3960 * Prevents the specified child to be laid out during the next layout pass. 3961 * 3962 * @param child the child on which to perform the cleanup 3963 */ 3964 protected void cleanupLayoutState(View child) { 3965 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3966 } 3967 3968 private void addViewInner(View child, int index, LayoutParams params, 3969 boolean preventRequestLayout) { 3970 3971 if (mTransition != null) { 3972 // Don't prevent other add transitions from completing, but cancel remove 3973 // transitions to let them complete the process before we add to the container 3974 mTransition.cancel(LayoutTransition.DISAPPEARING); 3975 } 3976 3977 if (child.getParent() != null) { 3978 throw new IllegalStateException("The specified child already has a parent. " + 3979 "You must call removeView() on the child's parent first."); 3980 } 3981 3982 if (mTransition != null) { 3983 mTransition.addChild(this, child); 3984 } 3985 3986 if (!checkLayoutParams(params)) { 3987 params = generateLayoutParams(params); 3988 } 3989 3990 if (preventRequestLayout) { 3991 child.mLayoutParams = params; 3992 } else { 3993 child.setLayoutParams(params); 3994 } 3995 3996 if (index < 0) { 3997 index = mChildrenCount; 3998 } 3999 4000 addInArray(child, index); 4001 4002 // tell our children 4003 if (preventRequestLayout) { 4004 child.assignParent(this); 4005 } else { 4006 child.mParent = this; 4007 } 4008 4009 if (child.hasFocus()) { 4010 requestChildFocus(child, child.findFocus()); 4011 } 4012 4013 AttachInfo ai = mAttachInfo; 4014 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 4015 boolean lastKeepOn = ai.mKeepScreenOn; 4016 ai.mKeepScreenOn = false; 4017 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 4018 if (ai.mKeepScreenOn) { 4019 needGlobalAttributesUpdate(true); 4020 } 4021 ai.mKeepScreenOn = lastKeepOn; 4022 } 4023 4024 if (child.isLayoutDirectionInherited()) { 4025 child.resetRtlProperties(); 4026 } 4027 4028 onViewAdded(child); 4029 4030 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 4031 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 4032 } 4033 4034 if (child.hasTransientState()) { 4035 childHasTransientStateChanged(child, true); 4036 } 4037 4038 if (child.getVisibility() != View.GONE) { 4039 notifySubtreeAccessibilityStateChangedIfNeeded(); 4040 } 4041 } 4042 4043 private void addInArray(View child, int index) { 4044 View[] children = mChildren; 4045 final int count = mChildrenCount; 4046 final int size = children.length; 4047 if (index == count) { 4048 if (size == count) { 4049 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4050 System.arraycopy(children, 0, mChildren, 0, size); 4051 children = mChildren; 4052 } 4053 children[mChildrenCount++] = child; 4054 } else if (index < count) { 4055 if (size == count) { 4056 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4057 System.arraycopy(children, 0, mChildren, 0, index); 4058 System.arraycopy(children, index, mChildren, index + 1, count - index); 4059 children = mChildren; 4060 } else { 4061 System.arraycopy(children, index, children, index + 1, count - index); 4062 } 4063 children[index] = child; 4064 mChildrenCount++; 4065 if (mLastTouchDownIndex >= index) { 4066 mLastTouchDownIndex++; 4067 } 4068 } else { 4069 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 4070 } 4071 } 4072 4073 // This method also sets the child's mParent to null 4074 private void removeFromArray(int index) { 4075 final View[] children = mChildren; 4076 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 4077 children[index].mParent = null; 4078 } 4079 final int count = mChildrenCount; 4080 if (index == count - 1) { 4081 children[--mChildrenCount] = null; 4082 } else if (index >= 0 && index < count) { 4083 System.arraycopy(children, index + 1, children, index, count - index - 1); 4084 children[--mChildrenCount] = null; 4085 } else { 4086 throw new IndexOutOfBoundsException(); 4087 } 4088 if (mLastTouchDownIndex == index) { 4089 mLastTouchDownTime = 0; 4090 mLastTouchDownIndex = -1; 4091 } else if (mLastTouchDownIndex > index) { 4092 mLastTouchDownIndex--; 4093 } 4094 } 4095 4096 // This method also sets the children's mParent to null 4097 private void removeFromArray(int start, int count) { 4098 final View[] children = mChildren; 4099 final int childrenCount = mChildrenCount; 4100 4101 start = Math.max(0, start); 4102 final int end = Math.min(childrenCount, start + count); 4103 4104 if (start == end) { 4105 return; 4106 } 4107 4108 if (end == childrenCount) { 4109 for (int i = start; i < end; i++) { 4110 children[i].mParent = null; 4111 children[i] = null; 4112 } 4113 } else { 4114 for (int i = start; i < end; i++) { 4115 children[i].mParent = null; 4116 } 4117 4118 // Since we're looping above, we might as well do the copy, but is arraycopy() 4119 // faster than the extra 2 bounds checks we would do in the loop? 4120 System.arraycopy(children, end, children, start, childrenCount - end); 4121 4122 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 4123 children[i] = null; 4124 } 4125 } 4126 4127 mChildrenCount -= (end - start); 4128 } 4129 4130 private void bindLayoutAnimation(View child) { 4131 Animation a = mLayoutAnimationController.getAnimationForView(child); 4132 child.setAnimation(a); 4133 } 4134 4135 /** 4136 * Subclasses should override this method to set layout animation 4137 * parameters on the supplied child. 4138 * 4139 * @param child the child to associate with animation parameters 4140 * @param params the child's layout parameters which hold the animation 4141 * parameters 4142 * @param index the index of the child in the view group 4143 * @param count the number of children in the view group 4144 */ 4145 protected void attachLayoutAnimationParameters(View child, 4146 LayoutParams params, int index, int count) { 4147 LayoutAnimationController.AnimationParameters animationParams = 4148 params.layoutAnimationParameters; 4149 if (animationParams == null) { 4150 animationParams = new LayoutAnimationController.AnimationParameters(); 4151 params.layoutAnimationParameters = animationParams; 4152 } 4153 4154 animationParams.count = count; 4155 animationParams.index = index; 4156 } 4157 4158 /** 4159 * {@inheritDoc} 4160 * 4161 * <p><strong>Note:</strong> do not invoke this method from 4162 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4163 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4164 */ 4165 public void removeView(View view) { 4166 if (removeViewInternal(view)) { 4167 requestLayout(); 4168 invalidate(true); 4169 } 4170 } 4171 4172 /** 4173 * Removes a view during layout. This is useful if in your onLayout() method, 4174 * you need to remove more views. 4175 * 4176 * <p><strong>Note:</strong> do not invoke this method from 4177 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4178 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4179 * 4180 * @param view the view to remove from the group 4181 */ 4182 public void removeViewInLayout(View view) { 4183 removeViewInternal(view); 4184 } 4185 4186 /** 4187 * Removes a range of views during layout. This is useful if in your onLayout() method, 4188 * you need to remove more views. 4189 * 4190 * <p><strong>Note:</strong> do not invoke this method from 4191 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4192 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4193 * 4194 * @param start the index of the first view to remove from the group 4195 * @param count the number of views to remove from the group 4196 */ 4197 public void removeViewsInLayout(int start, int count) { 4198 removeViewsInternal(start, count); 4199 } 4200 4201 /** 4202 * Removes the view at the specified position in the group. 4203 * 4204 * <p><strong>Note:</strong> do not invoke this method from 4205 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4206 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4207 * 4208 * @param index the position in the group of the view to remove 4209 */ 4210 public void removeViewAt(int index) { 4211 removeViewInternal(index, getChildAt(index)); 4212 requestLayout(); 4213 invalidate(true); 4214 } 4215 4216 /** 4217 * Removes the specified range of views from the group. 4218 * 4219 * <p><strong>Note:</strong> do not invoke this method from 4220 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4221 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4222 * 4223 * @param start the first position in the group of the range of views to remove 4224 * @param count the number of views to remove 4225 */ 4226 public void removeViews(int start, int count) { 4227 removeViewsInternal(start, count); 4228 requestLayout(); 4229 invalidate(true); 4230 } 4231 4232 private boolean removeViewInternal(View view) { 4233 final int index = indexOfChild(view); 4234 if (index >= 0) { 4235 removeViewInternal(index, view); 4236 return true; 4237 } 4238 return false; 4239 } 4240 4241 private void removeViewInternal(int index, View view) { 4242 4243 if (mTransition != null) { 4244 mTransition.removeChild(this, view); 4245 } 4246 4247 boolean clearChildFocus = false; 4248 if (view == mFocused) { 4249 view.unFocus(null); 4250 clearChildFocus = true; 4251 } 4252 4253 view.clearAccessibilityFocus(); 4254 4255 cancelTouchTarget(view); 4256 cancelHoverTarget(view); 4257 4258 if (view.getAnimation() != null || 4259 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4260 addDisappearingView(view); 4261 } else if (view.mAttachInfo != null) { 4262 view.dispatchDetachedFromWindow(); 4263 } 4264 4265 if (view.hasTransientState()) { 4266 childHasTransientStateChanged(view, false); 4267 } 4268 4269 needGlobalAttributesUpdate(false); 4270 4271 removeFromArray(index); 4272 4273 if (clearChildFocus) { 4274 clearChildFocus(view); 4275 if (!rootViewRequestFocus()) { 4276 notifyGlobalFocusCleared(this); 4277 } 4278 } 4279 4280 onViewRemoved(view); 4281 4282 if (view.getVisibility() != View.GONE) { 4283 notifySubtreeAccessibilityStateChangedIfNeeded(); 4284 } 4285 } 4286 4287 /** 4288 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4289 * not null, changes in layout which occur because of children being added to or removed from 4290 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4291 * object. By default, the transition object is null (so layout changes are not animated). 4292 * 4293 * <p>Replacing a non-null transition will cause that previous transition to be 4294 * canceled, if it is currently running, to restore this container to 4295 * its correct post-transition state.</p> 4296 * 4297 * @param transition The LayoutTransition object that will animated changes in layout. A value 4298 * of <code>null</code> means no transition will run on layout changes. 4299 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 4300 */ 4301 public void setLayoutTransition(LayoutTransition transition) { 4302 if (mTransition != null) { 4303 LayoutTransition previousTransition = mTransition; 4304 previousTransition.cancel(); 4305 previousTransition.removeTransitionListener(mLayoutTransitionListener); 4306 } 4307 mTransition = transition; 4308 if (mTransition != null) { 4309 mTransition.addTransitionListener(mLayoutTransitionListener); 4310 } 4311 } 4312 4313 /** 4314 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4315 * not null, changes in layout which occur because of children being added to or removed from 4316 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4317 * object. By default, the transition object is null (so layout changes are not animated). 4318 * 4319 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 4320 * A value of <code>null</code> means no transition will run on layout changes. 4321 */ 4322 public LayoutTransition getLayoutTransition() { 4323 return mTransition; 4324 } 4325 4326 private void removeViewsInternal(int start, int count) { 4327 final View focused = mFocused; 4328 final boolean detach = mAttachInfo != null; 4329 boolean clearChildFocus = false; 4330 4331 final View[] children = mChildren; 4332 final int end = start + count; 4333 4334 for (int i = start; i < end; i++) { 4335 final View view = children[i]; 4336 4337 if (mTransition != null) { 4338 mTransition.removeChild(this, view); 4339 } 4340 4341 if (view == focused) { 4342 view.unFocus(null); 4343 clearChildFocus = true; 4344 } 4345 4346 view.clearAccessibilityFocus(); 4347 4348 cancelTouchTarget(view); 4349 cancelHoverTarget(view); 4350 4351 if (view.getAnimation() != null || 4352 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4353 addDisappearingView(view); 4354 } else if (detach) { 4355 view.dispatchDetachedFromWindow(); 4356 } 4357 4358 if (view.hasTransientState()) { 4359 childHasTransientStateChanged(view, false); 4360 } 4361 4362 needGlobalAttributesUpdate(false); 4363 4364 onViewRemoved(view); 4365 } 4366 4367 removeFromArray(start, count); 4368 4369 if (clearChildFocus) { 4370 clearChildFocus(focused); 4371 if (!rootViewRequestFocus()) { 4372 notifyGlobalFocusCleared(focused); 4373 } 4374 } 4375 } 4376 4377 /** 4378 * Call this method to remove all child views from the 4379 * ViewGroup. 4380 * 4381 * <p><strong>Note:</strong> do not invoke this method from 4382 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4383 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4384 */ 4385 public void removeAllViews() { 4386 removeAllViewsInLayout(); 4387 requestLayout(); 4388 invalidate(true); 4389 } 4390 4391 /** 4392 * Called by a ViewGroup subclass to remove child views from itself, 4393 * when it must first know its size on screen before it can calculate how many 4394 * child views it will render. An example is a Gallery or a ListView, which 4395 * may "have" 50 children, but actually only render the number of children 4396 * that can currently fit inside the object on screen. Do not call 4397 * this method unless you are extending ViewGroup and understand the 4398 * view measuring and layout pipeline. 4399 * 4400 * <p><strong>Note:</strong> do not invoke this method from 4401 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4402 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4403 */ 4404 public void removeAllViewsInLayout() { 4405 final int count = mChildrenCount; 4406 if (count <= 0) { 4407 return; 4408 } 4409 4410 final View[] children = mChildren; 4411 mChildrenCount = 0; 4412 4413 final View focused = mFocused; 4414 final boolean detach = mAttachInfo != null; 4415 boolean clearChildFocus = false; 4416 4417 needGlobalAttributesUpdate(false); 4418 4419 for (int i = count - 1; i >= 0; i--) { 4420 final View view = children[i]; 4421 4422 if (mTransition != null) { 4423 mTransition.removeChild(this, view); 4424 } 4425 4426 if (view == focused) { 4427 view.unFocus(null); 4428 clearChildFocus = true; 4429 } 4430 4431 view.clearAccessibilityFocus(); 4432 4433 cancelTouchTarget(view); 4434 cancelHoverTarget(view); 4435 4436 if (view.getAnimation() != null || 4437 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4438 addDisappearingView(view); 4439 } else if (detach) { 4440 view.dispatchDetachedFromWindow(); 4441 } 4442 4443 if (view.hasTransientState()) { 4444 childHasTransientStateChanged(view, false); 4445 } 4446 4447 onViewRemoved(view); 4448 4449 view.mParent = null; 4450 children[i] = null; 4451 } 4452 4453 if (clearChildFocus) { 4454 clearChildFocus(focused); 4455 if (!rootViewRequestFocus()) { 4456 notifyGlobalFocusCleared(focused); 4457 } 4458 } 4459 } 4460 4461 /** 4462 * Finishes the removal of a detached view. This method will dispatch the detached from 4463 * window event and notify the hierarchy change listener. 4464 * <p> 4465 * This method is intended to be lightweight and makes no assumptions about whether the 4466 * parent or child should be redrawn. Proper use of this method will include also making 4467 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4468 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4469 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4470 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4471 * 4472 * @param child the child to be definitely removed from the view hierarchy 4473 * @param animate if true and the view has an animation, the view is placed in the 4474 * disappearing views list, otherwise, it is detached from the window 4475 * 4476 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4477 * @see #detachAllViewsFromParent() 4478 * @see #detachViewFromParent(View) 4479 * @see #detachViewFromParent(int) 4480 */ 4481 protected void removeDetachedView(View child, boolean animate) { 4482 if (mTransition != null) { 4483 mTransition.removeChild(this, child); 4484 } 4485 4486 if (child == mFocused) { 4487 child.clearFocus(); 4488 } 4489 4490 child.clearAccessibilityFocus(); 4491 4492 cancelTouchTarget(child); 4493 cancelHoverTarget(child); 4494 4495 if ((animate && child.getAnimation() != null) || 4496 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4497 addDisappearingView(child); 4498 } else if (child.mAttachInfo != null) { 4499 child.dispatchDetachedFromWindow(); 4500 } 4501 4502 if (child.hasTransientState()) { 4503 childHasTransientStateChanged(child, false); 4504 } 4505 4506 onViewRemoved(child); 4507 } 4508 4509 /** 4510 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4511 * sets the layout parameters and puts the view in the list of children so that 4512 * it can be retrieved by calling {@link #getChildAt(int)}. 4513 * <p> 4514 * This method is intended to be lightweight and makes no assumptions about whether the 4515 * parent or child should be redrawn. Proper use of this method will include also making 4516 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4517 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4518 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4519 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4520 * <p> 4521 * This method should be called only for views which were detached from their parent. 4522 * 4523 * @param child the child to attach 4524 * @param index the index at which the child should be attached 4525 * @param params the layout parameters of the child 4526 * 4527 * @see #removeDetachedView(View, boolean) 4528 * @see #detachAllViewsFromParent() 4529 * @see #detachViewFromParent(View) 4530 * @see #detachViewFromParent(int) 4531 */ 4532 protected void attachViewToParent(View child, int index, LayoutParams params) { 4533 child.mLayoutParams = params; 4534 4535 if (index < 0) { 4536 index = mChildrenCount; 4537 } 4538 4539 addInArray(child, index); 4540 4541 child.mParent = this; 4542 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4543 & ~PFLAG_DRAWING_CACHE_VALID) 4544 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4545 this.mPrivateFlags |= PFLAG_INVALIDATED; 4546 4547 if (child.hasFocus()) { 4548 requestChildFocus(child, child.findFocus()); 4549 } 4550 } 4551 4552 /** 4553 * Detaches a view from its parent. Detaching a view should be followed 4554 * either by a call to 4555 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4556 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4557 * temporary; reattachment or removal should happen within the same drawing cycle as 4558 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4559 * call to {@link #getChildAt(int)}. 4560 * 4561 * @param child the child to detach 4562 * 4563 * @see #detachViewFromParent(int) 4564 * @see #detachViewsFromParent(int, int) 4565 * @see #detachAllViewsFromParent() 4566 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4567 * @see #removeDetachedView(View, boolean) 4568 */ 4569 protected void detachViewFromParent(View child) { 4570 removeFromArray(indexOfChild(child)); 4571 } 4572 4573 /** 4574 * Detaches a view from its parent. Detaching a view should be followed 4575 * either by a call to 4576 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4577 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4578 * temporary; reattachment or removal should happen within the same drawing cycle as 4579 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4580 * call to {@link #getChildAt(int)}. 4581 * 4582 * @param index the index of the child to detach 4583 * 4584 * @see #detachViewFromParent(View) 4585 * @see #detachAllViewsFromParent() 4586 * @see #detachViewsFromParent(int, int) 4587 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4588 * @see #removeDetachedView(View, boolean) 4589 */ 4590 protected void detachViewFromParent(int index) { 4591 removeFromArray(index); 4592 } 4593 4594 /** 4595 * Detaches a range of views from their parents. Detaching a view should be followed 4596 * either by a call to 4597 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4598 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4599 * temporary; reattachment or removal should happen within the same drawing cycle as 4600 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4601 * call to {@link #getChildAt(int)}. 4602 * 4603 * @param start the first index of the childrend range to detach 4604 * @param count the number of children to detach 4605 * 4606 * @see #detachViewFromParent(View) 4607 * @see #detachViewFromParent(int) 4608 * @see #detachAllViewsFromParent() 4609 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4610 * @see #removeDetachedView(View, boolean) 4611 */ 4612 protected void detachViewsFromParent(int start, int count) { 4613 removeFromArray(start, count); 4614 } 4615 4616 /** 4617 * Detaches all views from the parent. Detaching a view should be followed 4618 * either by a call to 4619 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4620 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4621 * temporary; reattachment or removal should happen within the same drawing cycle as 4622 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4623 * call to {@link #getChildAt(int)}. 4624 * 4625 * @see #detachViewFromParent(View) 4626 * @see #detachViewFromParent(int) 4627 * @see #detachViewsFromParent(int, int) 4628 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4629 * @see #removeDetachedView(View, boolean) 4630 */ 4631 protected void detachAllViewsFromParent() { 4632 final int count = mChildrenCount; 4633 if (count <= 0) { 4634 return; 4635 } 4636 4637 final View[] children = mChildren; 4638 mChildrenCount = 0; 4639 4640 for (int i = count - 1; i >= 0; i--) { 4641 children[i].mParent = null; 4642 children[i] = null; 4643 } 4644 } 4645 4646 /** 4647 * Don't call or override this method. It is used for the implementation of 4648 * the view hierarchy. 4649 */ 4650 public final void invalidateChild(View child, final Rect dirty) { 4651 ViewParent parent = this; 4652 4653 final AttachInfo attachInfo = mAttachInfo; 4654 if (attachInfo != null) { 4655 // If the child is drawing an animation, we want to copy this flag onto 4656 // ourselves and the parent to make sure the invalidate request goes 4657 // through 4658 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4659 == PFLAG_DRAW_ANIMATION; 4660 4661 // Check whether the child that requests the invalidate is fully opaque 4662 // Views being animated or transformed are not considered opaque because we may 4663 // be invalidating their old position and need the parent to paint behind them. 4664 Matrix childMatrix = child.getMatrix(); 4665 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4666 child.getAnimation() == null && childMatrix.isIdentity(); 4667 // Mark the child as dirty, using the appropriate flag 4668 // Make sure we do not set both flags at the same time 4669 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4670 4671 if (child.mLayerType != LAYER_TYPE_NONE) { 4672 mPrivateFlags |= PFLAG_INVALIDATED; 4673 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4674 } 4675 4676 final int[] location = attachInfo.mInvalidateChildLocation; 4677 location[CHILD_LEFT_INDEX] = child.mLeft; 4678 location[CHILD_TOP_INDEX] = child.mTop; 4679 if (!childMatrix.isIdentity() || 4680 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4681 RectF boundingRect = attachInfo.mTmpTransformRect; 4682 boundingRect.set(dirty); 4683 Matrix transformMatrix; 4684 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4685 Transformation t = attachInfo.mTmpTransformation; 4686 boolean transformed = getChildStaticTransformation(child, t); 4687 if (transformed) { 4688 transformMatrix = attachInfo.mTmpMatrix; 4689 transformMatrix.set(t.getMatrix()); 4690 if (!childMatrix.isIdentity()) { 4691 transformMatrix.preConcat(childMatrix); 4692 } 4693 } else { 4694 transformMatrix = childMatrix; 4695 } 4696 } else { 4697 transformMatrix = childMatrix; 4698 } 4699 transformMatrix.mapRect(boundingRect); 4700 dirty.set((int) (boundingRect.left - 0.5f), 4701 (int) (boundingRect.top - 0.5f), 4702 (int) (boundingRect.right + 0.5f), 4703 (int) (boundingRect.bottom + 0.5f)); 4704 } 4705 4706 do { 4707 View view = null; 4708 if (parent instanceof View) { 4709 view = (View) parent; 4710 } 4711 4712 if (drawAnimation) { 4713 if (view != null) { 4714 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4715 } else if (parent instanceof ViewRootImpl) { 4716 ((ViewRootImpl) parent).mIsAnimating = true; 4717 } 4718 } 4719 4720 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4721 // flag coming from the child that initiated the invalidate 4722 if (view != null) { 4723 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4724 view.getSolidColor() == 0) { 4725 opaqueFlag = PFLAG_DIRTY; 4726 } 4727 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4728 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4729 } 4730 } 4731 4732 parent = parent.invalidateChildInParent(location, dirty); 4733 if (view != null) { 4734 // Account for transform on current parent 4735 Matrix m = view.getMatrix(); 4736 if (!m.isIdentity()) { 4737 RectF boundingRect = attachInfo.mTmpTransformRect; 4738 boundingRect.set(dirty); 4739 m.mapRect(boundingRect); 4740 dirty.set((int) (boundingRect.left - 0.5f), 4741 (int) (boundingRect.top - 0.5f), 4742 (int) (boundingRect.right + 0.5f), 4743 (int) (boundingRect.bottom + 0.5f)); 4744 } 4745 } 4746 } while (parent != null); 4747 } 4748 } 4749 4750 /** 4751 * Don't call or override this method. It is used for the implementation of 4752 * the view hierarchy. 4753 * 4754 * This implementation returns null if this ViewGroup does not have a parent, 4755 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4756 * does not intersect with this ViewGroup's bounds. 4757 */ 4758 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4759 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4760 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4761 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4762 FLAG_OPTIMIZE_INVALIDATE) { 4763 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4764 location[CHILD_TOP_INDEX] - mScrollY); 4765 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4766 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4767 } 4768 4769 final int left = mLeft; 4770 final int top = mTop; 4771 4772 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4773 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4774 dirty.setEmpty(); 4775 } 4776 } 4777 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4778 4779 location[CHILD_LEFT_INDEX] = left; 4780 location[CHILD_TOP_INDEX] = top; 4781 4782 if (mLayerType != LAYER_TYPE_NONE) { 4783 mPrivateFlags |= PFLAG_INVALIDATED; 4784 } 4785 4786 return mParent; 4787 4788 } else { 4789 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4790 4791 location[CHILD_LEFT_INDEX] = mLeft; 4792 location[CHILD_TOP_INDEX] = mTop; 4793 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4794 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4795 } else { 4796 // in case the dirty rect extends outside the bounds of this container 4797 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4798 } 4799 4800 if (mLayerType != LAYER_TYPE_NONE) { 4801 mPrivateFlags |= PFLAG_INVALIDATED; 4802 } 4803 4804 return mParent; 4805 } 4806 } 4807 4808 return null; 4809 } 4810 4811 /** 4812 * Native-calculated damage path 4813 * Returns false if this path was unable to complete successfully. This means 4814 * it hit a ViewParent it doesn't recognize and needs to fall back to calculating 4815 * damage area 4816 * @hide 4817 */ 4818 public boolean damageChildDeferred(View child) { 4819 ViewParent parent = getParent(); 4820 while (parent != null) { 4821 if (parent instanceof ViewGroup) { 4822 parent = parent.getParent(); 4823 } else if (parent instanceof ViewRootImpl) { 4824 ((ViewRootImpl) parent).invalidate(); 4825 return true; 4826 } else { 4827 parent = null; 4828 } 4829 } 4830 return false; 4831 } 4832 4833 /** 4834 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4835 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4836 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4837 * 4838 * @hide 4839 */ 4840 public void damageChild(View child, final Rect dirty) { 4841 if (damageChildDeferred(child)) { 4842 return; 4843 } 4844 4845 ViewParent parent = this; 4846 4847 final AttachInfo attachInfo = mAttachInfo; 4848 if (attachInfo != null) { 4849 int left = child.mLeft; 4850 int top = child.mTop; 4851 if (!child.getMatrix().isIdentity()) { 4852 child.transformRect(dirty); 4853 } 4854 4855 do { 4856 if (parent instanceof ViewGroup) { 4857 ViewGroup parentVG = (ViewGroup) parent; 4858 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4859 // Layered parents should be recreated, not just re-issued 4860 parentVG.invalidate(); 4861 parent = null; 4862 } else { 4863 parent = parentVG.damageChildInParent(left, top, dirty); 4864 left = parentVG.mLeft; 4865 top = parentVG.mTop; 4866 } 4867 } else { 4868 // Reached the top; this calls into the usual invalidate method in 4869 // ViewRootImpl, which schedules a traversal 4870 final int[] location = attachInfo.mInvalidateChildLocation; 4871 location[0] = left; 4872 location[1] = top; 4873 parent = parent.invalidateChildInParent(location, dirty); 4874 } 4875 } while (parent != null); 4876 } 4877 } 4878 4879 /** 4880 * Quick invalidation method that simply transforms the dirty rect into the parent's 4881 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4882 * 4883 * @hide 4884 */ 4885 protected ViewParent damageChildInParent(int left, int top, final Rect dirty) { 4886 if ((mPrivateFlags & PFLAG_DRAWN) != 0 4887 || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) != 0) { 4888 dirty.offset(left - mScrollX, top - mScrollY); 4889 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4890 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4891 } 4892 4893 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4894 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4895 4896 if (!getMatrix().isIdentity()) { 4897 transformRect(dirty); 4898 } 4899 4900 return mParent; 4901 } 4902 } 4903 4904 return null; 4905 } 4906 4907 /** 4908 * Offset a rectangle that is in a descendant's coordinate 4909 * space into our coordinate space. 4910 * @param descendant A descendant of this view 4911 * @param rect A rectangle defined in descendant's coordinate space. 4912 */ 4913 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4914 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4915 } 4916 4917 /** 4918 * Offset a rectangle that is in our coordinate space into an ancestor's 4919 * coordinate space. 4920 * @param descendant A descendant of this view 4921 * @param rect A rectangle defined in descendant's coordinate space. 4922 */ 4923 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4924 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4925 } 4926 4927 /** 4928 * Helper method that offsets a rect either from parent to descendant or 4929 * descendant to parent. 4930 */ 4931 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4932 boolean offsetFromChildToParent, boolean clipToBounds) { 4933 4934 // already in the same coord system :) 4935 if (descendant == this) { 4936 return; 4937 } 4938 4939 ViewParent theParent = descendant.mParent; 4940 4941 // search and offset up to the parent 4942 while ((theParent != null) 4943 && (theParent instanceof View) 4944 && (theParent != this)) { 4945 4946 if (offsetFromChildToParent) { 4947 rect.offset(descendant.mLeft - descendant.mScrollX, 4948 descendant.mTop - descendant.mScrollY); 4949 if (clipToBounds) { 4950 View p = (View) theParent; 4951 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4952 } 4953 } else { 4954 if (clipToBounds) { 4955 View p = (View) theParent; 4956 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4957 } 4958 rect.offset(descendant.mScrollX - descendant.mLeft, 4959 descendant.mScrollY - descendant.mTop); 4960 } 4961 4962 descendant = (View) theParent; 4963 theParent = descendant.mParent; 4964 } 4965 4966 // now that we are up to this view, need to offset one more time 4967 // to get into our coordinate space 4968 if (theParent == this) { 4969 if (offsetFromChildToParent) { 4970 rect.offset(descendant.mLeft - descendant.mScrollX, 4971 descendant.mTop - descendant.mScrollY); 4972 } else { 4973 rect.offset(descendant.mScrollX - descendant.mLeft, 4974 descendant.mScrollY - descendant.mTop); 4975 } 4976 } else { 4977 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4978 } 4979 } 4980 4981 /** 4982 * Offset the vertical location of all children of this view by the specified number of pixels. 4983 * 4984 * @param offset the number of pixels to offset 4985 * 4986 * @hide 4987 */ 4988 public void offsetChildrenTopAndBottom(int offset) { 4989 final int count = mChildrenCount; 4990 final View[] children = mChildren; 4991 boolean invalidate = false; 4992 4993 for (int i = 0; i < count; i++) { 4994 final View v = children[i]; 4995 v.mTop += offset; 4996 v.mBottom += offset; 4997 if (v.mRenderNode != null) { 4998 invalidate = true; 4999 v.mRenderNode.offsetTopAndBottom(offset); 5000 } 5001 } 5002 5003 if (invalidate) { 5004 invalidateViewProperty(false, false); 5005 } 5006 notifySubtreeAccessibilityStateChangedIfNeeded(); 5007 } 5008 5009 /** 5010 * {@inheritDoc} 5011 */ 5012 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 5013 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 5014 // but for some simple tests it can be useful. If we don't have attach info this 5015 // will allocate memory. 5016 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 5017 rect.set(r); 5018 5019 if (!child.hasIdentityMatrix()) { 5020 child.getMatrix().mapRect(rect); 5021 } 5022 5023 int dx = child.mLeft - mScrollX; 5024 int dy = child.mTop - mScrollY; 5025 5026 rect.offset(dx, dy); 5027 5028 if (offset != null) { 5029 if (!child.hasIdentityMatrix()) { 5030 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 5031 : new float[2]; 5032 position[0] = offset.x; 5033 position[1] = offset.y; 5034 child.getMatrix().mapPoints(position); 5035 offset.x = (int) (position[0] + 0.5f); 5036 offset.y = (int) (position[1] + 0.5f); 5037 } 5038 offset.x += dx; 5039 offset.y += dy; 5040 } 5041 5042 boolean rectIsVisible = true; 5043 if (mParent instanceof ViewGroup && ((ViewGroup)mParent).getClipChildren()) { 5044 // clipChildren clips to the child's bounds 5045 rectIsVisible = rect.intersect(0, 0, mRight - mLeft, mBottom - mTop); 5046 } 5047 5048 if (rectIsVisible && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 5049 // Clip to padding 5050 rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop, 5051 mRight - mLeft - mPaddingLeft - mPaddingRight, 5052 mBottom - mTop - mPaddingTop - mPaddingBottom); 5053 } 5054 5055 if (rectIsVisible && mClipBounds != null) { 5056 // Clip to clipBounds 5057 rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right, 5058 mClipBounds.bottom); 5059 } 5060 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), (int) (rect.right + 0.5f), 5061 (int) (rect.bottom + 0.5f)); 5062 if (rectIsVisible && mParent != null) { 5063 rectIsVisible = mParent.getChildVisibleRect(this, r, offset); 5064 } 5065 return rectIsVisible; 5066 } 5067 5068 /** 5069 * {@inheritDoc} 5070 */ 5071 @Override 5072 public final void layout(int l, int t, int r, int b) { 5073 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 5074 if (mTransition != null) { 5075 mTransition.layoutChange(this); 5076 } 5077 super.layout(l, t, r, b); 5078 } else { 5079 // record the fact that we noop'd it; request layout when transition finishes 5080 mLayoutCalledWhileSuppressed = true; 5081 } 5082 } 5083 5084 /** 5085 * {@inheritDoc} 5086 */ 5087 @Override 5088 protected abstract void onLayout(boolean changed, 5089 int l, int t, int r, int b); 5090 5091 /** 5092 * Indicates whether the view group has the ability to animate its children 5093 * after the first layout. 5094 * 5095 * @return true if the children can be animated, false otherwise 5096 */ 5097 protected boolean canAnimate() { 5098 return mLayoutAnimationController != null; 5099 } 5100 5101 /** 5102 * Runs the layout animation. Calling this method triggers a relayout of 5103 * this view group. 5104 */ 5105 public void startLayoutAnimation() { 5106 if (mLayoutAnimationController != null) { 5107 mGroupFlags |= FLAG_RUN_ANIMATION; 5108 requestLayout(); 5109 } 5110 } 5111 5112 /** 5113 * Schedules the layout animation to be played after the next layout pass 5114 * of this view group. This can be used to restart the layout animation 5115 * when the content of the view group changes or when the activity is 5116 * paused and resumed. 5117 */ 5118 public void scheduleLayoutAnimation() { 5119 mGroupFlags |= FLAG_RUN_ANIMATION; 5120 } 5121 5122 /** 5123 * Sets the layout animation controller used to animate the group's 5124 * children after the first layout. 5125 * 5126 * @param controller the animation controller 5127 */ 5128 public void setLayoutAnimation(LayoutAnimationController controller) { 5129 mLayoutAnimationController = controller; 5130 if (mLayoutAnimationController != null) { 5131 mGroupFlags |= FLAG_RUN_ANIMATION; 5132 } 5133 } 5134 5135 /** 5136 * Returns the layout animation controller used to animate the group's 5137 * children. 5138 * 5139 * @return the current animation controller 5140 */ 5141 public LayoutAnimationController getLayoutAnimation() { 5142 return mLayoutAnimationController; 5143 } 5144 5145 /** 5146 * Indicates whether the children's drawing cache is used during a layout 5147 * animation. By default, the drawing cache is enabled but this will prevent 5148 * nested layout animations from working. To nest animations, you must disable 5149 * the cache. 5150 * 5151 * @return true if the animation cache is enabled, false otherwise 5152 * 5153 * @see #setAnimationCacheEnabled(boolean) 5154 * @see View#setDrawingCacheEnabled(boolean) 5155 */ 5156 @ViewDebug.ExportedProperty 5157 public boolean isAnimationCacheEnabled() { 5158 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 5159 } 5160 5161 /** 5162 * Enables or disables the children's drawing cache during a layout animation. 5163 * By default, the drawing cache is enabled but this will prevent nested 5164 * layout animations from working. To nest animations, you must disable the 5165 * cache. 5166 * 5167 * @param enabled true to enable the animation cache, false otherwise 5168 * 5169 * @see #isAnimationCacheEnabled() 5170 * @see View#setDrawingCacheEnabled(boolean) 5171 */ 5172 public void setAnimationCacheEnabled(boolean enabled) { 5173 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 5174 } 5175 5176 /** 5177 * Indicates whether this ViewGroup will always try to draw its children using their 5178 * drawing cache. By default this property is enabled. 5179 * 5180 * @return true if the animation cache is enabled, false otherwise 5181 * 5182 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5183 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5184 * @see View#setDrawingCacheEnabled(boolean) 5185 */ 5186 @ViewDebug.ExportedProperty(category = "drawing") 5187 public boolean isAlwaysDrawnWithCacheEnabled() { 5188 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 5189 } 5190 5191 /** 5192 * Indicates whether this ViewGroup will always try to draw its children using their 5193 * drawing cache. This property can be set to true when the cache rendering is 5194 * slightly different from the children's normal rendering. Renderings can be different, 5195 * for instance, when the cache's quality is set to low. 5196 * 5197 * When this property is disabled, the ViewGroup will use the drawing cache of its 5198 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 5199 * when to start using the drawing cache and when to stop using it. 5200 * 5201 * @param always true to always draw with the drawing cache, false otherwise 5202 * 5203 * @see #isAlwaysDrawnWithCacheEnabled() 5204 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5205 * @see View#setDrawingCacheEnabled(boolean) 5206 * @see View#setDrawingCacheQuality(int) 5207 */ 5208 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 5209 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 5210 } 5211 5212 /** 5213 * Indicates whether the ViewGroup is currently drawing its children using 5214 * their drawing cache. 5215 * 5216 * @return true if children should be drawn with their cache, false otherwise 5217 * 5218 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5219 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5220 */ 5221 @ViewDebug.ExportedProperty(category = "drawing") 5222 protected boolean isChildrenDrawnWithCacheEnabled() { 5223 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 5224 } 5225 5226 /** 5227 * Tells the ViewGroup to draw its children using their drawing cache. This property 5228 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 5229 * will be used only if it has been enabled. 5230 * 5231 * Subclasses should call this method to start and stop using the drawing cache when 5232 * they perform performance sensitive operations, like scrolling or animating. 5233 * 5234 * @param enabled true if children should be drawn with their cache, false otherwise 5235 * 5236 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5237 * @see #isChildrenDrawnWithCacheEnabled() 5238 */ 5239 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 5240 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 5241 } 5242 5243 /** 5244 * Indicates whether the ViewGroup is drawing its children in the order defined by 5245 * {@link #getChildDrawingOrder(int, int)}. 5246 * 5247 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 5248 * false otherwise 5249 * 5250 * @see #setChildrenDrawingOrderEnabled(boolean) 5251 * @see #getChildDrawingOrder(int, int) 5252 */ 5253 @ViewDebug.ExportedProperty(category = "drawing") 5254 protected boolean isChildrenDrawingOrderEnabled() { 5255 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 5256 } 5257 5258 /** 5259 * Tells the ViewGroup whether to draw its children in the order defined by the method 5260 * {@link #getChildDrawingOrder(int, int)}. 5261 * <p> 5262 * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)}, 5263 * will override custom child ordering done via this method. 5264 * 5265 * @param enabled true if the order of the children when drawing is determined by 5266 * {@link #getChildDrawingOrder(int, int)}, false otherwise 5267 * 5268 * @see #isChildrenDrawingOrderEnabled() 5269 * @see #getChildDrawingOrder(int, int) 5270 */ 5271 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 5272 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 5273 } 5274 5275 private boolean hasBooleanFlag(int flag) { 5276 return (mGroupFlags & flag) == flag; 5277 } 5278 5279 private void setBooleanFlag(int flag, boolean value) { 5280 if (value) { 5281 mGroupFlags |= flag; 5282 } else { 5283 mGroupFlags &= ~flag; 5284 } 5285 } 5286 5287 /** 5288 * Returns an integer indicating what types of drawing caches are kept in memory. 5289 * 5290 * @see #setPersistentDrawingCache(int) 5291 * @see #setAnimationCacheEnabled(boolean) 5292 * 5293 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 5294 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5295 * and {@link #PERSISTENT_ALL_CACHES} 5296 */ 5297 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 5298 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 5299 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 5300 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 5301 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 5302 }) 5303 public int getPersistentDrawingCache() { 5304 return mPersistentDrawingCache; 5305 } 5306 5307 /** 5308 * Indicates what types of drawing caches should be kept in memory after 5309 * they have been created. 5310 * 5311 * @see #getPersistentDrawingCache() 5312 * @see #setAnimationCacheEnabled(boolean) 5313 * 5314 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 5315 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5316 * and {@link #PERSISTENT_ALL_CACHES} 5317 */ 5318 public void setPersistentDrawingCache(int drawingCacheToKeep) { 5319 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 5320 } 5321 5322 private void setLayoutMode(int layoutMode, boolean explicitly) { 5323 mLayoutMode = layoutMode; 5324 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 5325 } 5326 5327 /** 5328 * Recursively traverse the view hierarchy, resetting the layoutMode of any 5329 * descendants that had inherited a different layoutMode from a previous parent. 5330 * Recursion terminates when a descendant's mode is: 5331 * <ul> 5332 * <li>Undefined</li> 5333 * <li>The same as the root node's</li> 5334 * <li>A mode that had been explicitly set</li> 5335 * <ul/> 5336 * The first two clauses are optimizations. 5337 * @param layoutModeOfRoot 5338 */ 5339 @Override 5340 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 5341 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 5342 mLayoutMode == layoutModeOfRoot || 5343 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 5344 return; 5345 } 5346 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 5347 5348 // apply recursively 5349 for (int i = 0, N = getChildCount(); i < N; i++) { 5350 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 5351 } 5352 } 5353 5354 /** 5355 * Returns the basis of alignment during layout operations on this ViewGroup: 5356 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5357 * <p> 5358 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 5359 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 5360 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 5361 * 5362 * @return the layout mode to use during layout operations 5363 * 5364 * @see #setLayoutMode(int) 5365 */ 5366 public int getLayoutMode() { 5367 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5368 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5369 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5370 setLayoutMode(inheritedLayoutMode, false); 5371 } 5372 return mLayoutMode; 5373 } 5374 5375 /** 5376 * Sets the basis of alignment during the layout of this ViewGroup. 5377 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5378 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5379 * 5380 * @param layoutMode the layout mode to use during layout operations 5381 * 5382 * @see #getLayoutMode() 5383 * @attr ref android.R.styleable#ViewGroup_layoutMode 5384 */ 5385 public void setLayoutMode(int layoutMode) { 5386 if (mLayoutMode != layoutMode) { 5387 invalidateInheritedLayoutMode(layoutMode); 5388 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5389 requestLayout(); 5390 } 5391 } 5392 5393 /** 5394 * Returns a new set of layout parameters based on the supplied attributes set. 5395 * 5396 * @param attrs the attributes to build the layout parameters from 5397 * 5398 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5399 * of its descendants 5400 */ 5401 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5402 return new LayoutParams(getContext(), attrs); 5403 } 5404 5405 /** 5406 * Returns a safe set of layout parameters based on the supplied layout params. 5407 * When a ViewGroup is passed a View whose layout params do not pass the test of 5408 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5409 * is invoked. This method should return a new set of layout params suitable for 5410 * this ViewGroup, possibly by copying the appropriate attributes from the 5411 * specified set of layout params. 5412 * 5413 * @param p The layout parameters to convert into a suitable set of layout parameters 5414 * for this ViewGroup. 5415 * 5416 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5417 * of its descendants 5418 */ 5419 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5420 return p; 5421 } 5422 5423 /** 5424 * Returns a set of default layout parameters. These parameters are requested 5425 * when the View passed to {@link #addView(View)} has no layout parameters 5426 * already set. If null is returned, an exception is thrown from addView. 5427 * 5428 * @return a set of default layout parameters or null 5429 */ 5430 protected LayoutParams generateDefaultLayoutParams() { 5431 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5432 } 5433 5434 /** 5435 * {@inheritDoc} 5436 */ 5437 @Override 5438 protected void debug(int depth) { 5439 super.debug(depth); 5440 String output; 5441 5442 if (mFocused != null) { 5443 output = debugIndent(depth); 5444 output += "mFocused"; 5445 Log.d(VIEW_LOG_TAG, output); 5446 } 5447 if (mChildrenCount != 0) { 5448 output = debugIndent(depth); 5449 output += "{"; 5450 Log.d(VIEW_LOG_TAG, output); 5451 } 5452 int count = mChildrenCount; 5453 for (int i = 0; i < count; i++) { 5454 View child = mChildren[i]; 5455 child.debug(depth + 1); 5456 } 5457 5458 if (mChildrenCount != 0) { 5459 output = debugIndent(depth); 5460 output += "}"; 5461 Log.d(VIEW_LOG_TAG, output); 5462 } 5463 } 5464 5465 /** 5466 * Returns the position in the group of the specified child view. 5467 * 5468 * @param child the view for which to get the position 5469 * @return a positive integer representing the position of the view in the 5470 * group, or -1 if the view does not exist in the group 5471 */ 5472 public int indexOfChild(View child) { 5473 final int count = mChildrenCount; 5474 final View[] children = mChildren; 5475 for (int i = 0; i < count; i++) { 5476 if (children[i] == child) { 5477 return i; 5478 } 5479 } 5480 return -1; 5481 } 5482 5483 /** 5484 * Returns the number of children in the group. 5485 * 5486 * @return a positive integer representing the number of children in 5487 * the group 5488 */ 5489 public int getChildCount() { 5490 return mChildrenCount; 5491 } 5492 5493 /** 5494 * Returns the view at the specified position in the group. 5495 * 5496 * @param index the position at which to get the view from 5497 * @return the view at the specified position or null if the position 5498 * does not exist within the group 5499 */ 5500 public View getChildAt(int index) { 5501 if (index < 0 || index >= mChildrenCount) { 5502 return null; 5503 } 5504 return mChildren[index]; 5505 } 5506 5507 /** 5508 * Ask all of the children of this view to measure themselves, taking into 5509 * account both the MeasureSpec requirements for this view and its padding. 5510 * We skip children that are in the GONE state The heavy lifting is done in 5511 * getChildMeasureSpec. 5512 * 5513 * @param widthMeasureSpec The width requirements for this view 5514 * @param heightMeasureSpec The height requirements for this view 5515 */ 5516 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5517 final int size = mChildrenCount; 5518 final View[] children = mChildren; 5519 for (int i = 0; i < size; ++i) { 5520 final View child = children[i]; 5521 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5522 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5523 } 5524 } 5525 } 5526 5527 /** 5528 * Ask one of the children of this view to measure itself, taking into 5529 * account both the MeasureSpec requirements for this view and its padding. 5530 * The heavy lifting is done in getChildMeasureSpec. 5531 * 5532 * @param child The child to measure 5533 * @param parentWidthMeasureSpec The width requirements for this view 5534 * @param parentHeightMeasureSpec The height requirements for this view 5535 */ 5536 protected void measureChild(View child, int parentWidthMeasureSpec, 5537 int parentHeightMeasureSpec) { 5538 final LayoutParams lp = child.getLayoutParams(); 5539 5540 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5541 mPaddingLeft + mPaddingRight, lp.width); 5542 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5543 mPaddingTop + mPaddingBottom, lp.height); 5544 5545 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5546 } 5547 5548 /** 5549 * Ask one of the children of this view to measure itself, taking into 5550 * account both the MeasureSpec requirements for this view and its padding 5551 * and margins. The child must have MarginLayoutParams The heavy lifting is 5552 * done in getChildMeasureSpec. 5553 * 5554 * @param child The child to measure 5555 * @param parentWidthMeasureSpec The width requirements for this view 5556 * @param widthUsed Extra space that has been used up by the parent 5557 * horizontally (possibly by other children of the parent) 5558 * @param parentHeightMeasureSpec The height requirements for this view 5559 * @param heightUsed Extra space that has been used up by the parent 5560 * vertically (possibly by other children of the parent) 5561 */ 5562 protected void measureChildWithMargins(View child, 5563 int parentWidthMeasureSpec, int widthUsed, 5564 int parentHeightMeasureSpec, int heightUsed) { 5565 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5566 5567 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5568 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5569 + widthUsed, lp.width); 5570 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5571 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5572 + heightUsed, lp.height); 5573 5574 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5575 } 5576 5577 /** 5578 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5579 * pass to a particular child. This method figures out the right MeasureSpec 5580 * for one dimension (height or width) of one child view. 5581 * 5582 * The goal is to combine information from our MeasureSpec with the 5583 * LayoutParams of the child to get the best possible results. For example, 5584 * if the this view knows its size (because its MeasureSpec has a mode of 5585 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5586 * to be the same size as the parent, the parent should ask the child to 5587 * layout given an exact size. 5588 * 5589 * @param spec The requirements for this view 5590 * @param padding The padding of this view for the current dimension and 5591 * margins, if applicable 5592 * @param childDimension How big the child wants to be in the current 5593 * dimension 5594 * @return a MeasureSpec integer for the child 5595 */ 5596 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5597 int specMode = MeasureSpec.getMode(spec); 5598 int specSize = MeasureSpec.getSize(spec); 5599 5600 int size = Math.max(0, specSize - padding); 5601 5602 int resultSize = 0; 5603 int resultMode = 0; 5604 5605 switch (specMode) { 5606 // Parent has imposed an exact size on us 5607 case MeasureSpec.EXACTLY: 5608 if (childDimension >= 0) { 5609 resultSize = childDimension; 5610 resultMode = MeasureSpec.EXACTLY; 5611 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5612 // Child wants to be our size. So be it. 5613 resultSize = size; 5614 resultMode = MeasureSpec.EXACTLY; 5615 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5616 // Child wants to determine its own size. It can't be 5617 // bigger than us. 5618 resultSize = size; 5619 resultMode = MeasureSpec.AT_MOST; 5620 } 5621 break; 5622 5623 // Parent has imposed a maximum size on us 5624 case MeasureSpec.AT_MOST: 5625 if (childDimension >= 0) { 5626 // Child wants a specific size... so be it 5627 resultSize = childDimension; 5628 resultMode = MeasureSpec.EXACTLY; 5629 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5630 // Child wants to be our size, but our size is not fixed. 5631 // Constrain child to not be bigger than us. 5632 resultSize = size; 5633 resultMode = MeasureSpec.AT_MOST; 5634 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5635 // Child wants to determine its own size. It can't be 5636 // bigger than us. 5637 resultSize = size; 5638 resultMode = MeasureSpec.AT_MOST; 5639 } 5640 break; 5641 5642 // Parent asked to see how big we want to be 5643 case MeasureSpec.UNSPECIFIED: 5644 if (childDimension >= 0) { 5645 // Child wants a specific size... let him have it 5646 resultSize = childDimension; 5647 resultMode = MeasureSpec.EXACTLY; 5648 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5649 // Child wants to be our size... find out how big it should 5650 // be 5651 resultSize = 0; 5652 resultMode = MeasureSpec.UNSPECIFIED; 5653 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5654 // Child wants to determine its own size.... find out how 5655 // big it should be 5656 resultSize = 0; 5657 resultMode = MeasureSpec.UNSPECIFIED; 5658 } 5659 break; 5660 } 5661 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5662 } 5663 5664 5665 /** 5666 * Removes any pending animations for views that have been removed. Call 5667 * this if you don't want animations for exiting views to stack up. 5668 */ 5669 public void clearDisappearingChildren() { 5670 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5671 if (disappearingChildren != null) { 5672 final int count = disappearingChildren.size(); 5673 for (int i = 0; i < count; i++) { 5674 final View view = disappearingChildren.get(i); 5675 if (view.mAttachInfo != null) { 5676 view.dispatchDetachedFromWindow(); 5677 } 5678 view.clearAnimation(); 5679 } 5680 disappearingChildren.clear(); 5681 invalidate(); 5682 } 5683 } 5684 5685 /** 5686 * Add a view which is removed from mChildren but still needs animation 5687 * 5688 * @param v View to add 5689 */ 5690 private void addDisappearingView(View v) { 5691 ArrayList<View> disappearingChildren = mDisappearingChildren; 5692 5693 if (disappearingChildren == null) { 5694 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5695 } 5696 5697 disappearingChildren.add(v); 5698 } 5699 5700 /** 5701 * Cleanup a view when its animation is done. This may mean removing it from 5702 * the list of disappearing views. 5703 * 5704 * @param view The view whose animation has finished 5705 * @param animation The animation, cannot be null 5706 */ 5707 void finishAnimatingView(final View view, Animation animation) { 5708 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5709 if (disappearingChildren != null) { 5710 if (disappearingChildren.contains(view)) { 5711 disappearingChildren.remove(view); 5712 5713 if (view.mAttachInfo != null) { 5714 view.dispatchDetachedFromWindow(); 5715 } 5716 5717 view.clearAnimation(); 5718 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5719 } 5720 } 5721 5722 if (animation != null && !animation.getFillAfter()) { 5723 view.clearAnimation(); 5724 } 5725 5726 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5727 view.onAnimationEnd(); 5728 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5729 // so we'd rather be safe than sorry 5730 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5731 // Draw one more frame after the animation is done 5732 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5733 } 5734 } 5735 5736 /** 5737 * Utility function called by View during invalidation to determine whether a view that 5738 * is invisible or gone should still be invalidated because it is being transitioned (and 5739 * therefore still needs to be drawn). 5740 */ 5741 boolean isViewTransitioning(View view) { 5742 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5743 } 5744 5745 /** 5746 * This method tells the ViewGroup that the given View object, which should have this 5747 * ViewGroup as its parent, 5748 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5749 * is removed from its parent. This allows animations, such as those used by 5750 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5751 * the removal of views. A call to this method should always be accompanied by a later call 5752 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5753 * so that the View finally gets removed. 5754 * 5755 * @param view The View object to be kept visible even if it gets removed from its parent. 5756 */ 5757 public void startViewTransition(View view) { 5758 if (view.mParent == this) { 5759 if (mTransitioningViews == null) { 5760 mTransitioningViews = new ArrayList<View>(); 5761 } 5762 mTransitioningViews.add(view); 5763 } 5764 } 5765 5766 /** 5767 * This method should always be called following an earlier call to 5768 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5769 * and will no longer be displayed. Note that this method does not perform the functionality 5770 * of removing a view from its parent; it just discontinues the display of a View that 5771 * has previously been removed. 5772 * 5773 * @return view The View object that has been removed but is being kept around in the visible 5774 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5775 */ 5776 public void endViewTransition(View view) { 5777 if (mTransitioningViews != null) { 5778 mTransitioningViews.remove(view); 5779 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5780 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5781 disappearingChildren.remove(view); 5782 if (mVisibilityChangingChildren != null && 5783 mVisibilityChangingChildren.contains(view)) { 5784 mVisibilityChangingChildren.remove(view); 5785 } else { 5786 if (view.mAttachInfo != null) { 5787 view.dispatchDetachedFromWindow(); 5788 } 5789 if (view.mParent != null) { 5790 view.mParent = null; 5791 } 5792 } 5793 invalidate(); 5794 } 5795 } 5796 } 5797 5798 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5799 new LayoutTransition.TransitionListener() { 5800 @Override 5801 public void startTransition(LayoutTransition transition, ViewGroup container, 5802 View view, int transitionType) { 5803 // We only care about disappearing items, since we need special logic to keep 5804 // those items visible after they've been 'removed' 5805 if (transitionType == LayoutTransition.DISAPPEARING) { 5806 startViewTransition(view); 5807 } 5808 } 5809 5810 @Override 5811 public void endTransition(LayoutTransition transition, ViewGroup container, 5812 View view, int transitionType) { 5813 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5814 requestLayout(); 5815 mLayoutCalledWhileSuppressed = false; 5816 } 5817 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5818 endViewTransition(view); 5819 } 5820 } 5821 }; 5822 5823 /** 5824 * Tells this ViewGroup to suppress all layout() calls until layout 5825 * suppression is disabled with a later call to suppressLayout(false). 5826 * When layout suppression is disabled, a requestLayout() call is sent 5827 * if layout() was attempted while layout was being suppressed. 5828 * 5829 * @hide 5830 */ 5831 public void suppressLayout(boolean suppress) { 5832 mSuppressLayout = suppress; 5833 if (!suppress) { 5834 if (mLayoutCalledWhileSuppressed) { 5835 requestLayout(); 5836 mLayoutCalledWhileSuppressed = false; 5837 } 5838 } 5839 } 5840 5841 /** 5842 * Returns whether layout calls on this container are currently being 5843 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 5844 * 5845 * @return true if layout calls are currently suppressed, false otherwise. 5846 * 5847 * @hide 5848 */ 5849 public boolean isLayoutSuppressed() { 5850 return mSuppressLayout; 5851 } 5852 5853 /** 5854 * {@inheritDoc} 5855 */ 5856 @Override 5857 public boolean gatherTransparentRegion(Region region) { 5858 // If no transparent regions requested, we are always opaque. 5859 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5860 if (meOpaque && region == null) { 5861 // The caller doesn't care about the region, so stop now. 5862 return true; 5863 } 5864 super.gatherTransparentRegion(region); 5865 final View[] children = mChildren; 5866 final int count = mChildrenCount; 5867 boolean noneOfTheChildrenAreTransparent = true; 5868 for (int i = 0; i < count; i++) { 5869 final View child = children[i]; 5870 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5871 if (!child.gatherTransparentRegion(region)) { 5872 noneOfTheChildrenAreTransparent = false; 5873 } 5874 } 5875 } 5876 return meOpaque || noneOfTheChildrenAreTransparent; 5877 } 5878 5879 /** 5880 * {@inheritDoc} 5881 */ 5882 public void requestTransparentRegion(View child) { 5883 if (child != null) { 5884 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5885 if (mParent != null) { 5886 mParent.requestTransparentRegion(this); 5887 } 5888 } 5889 } 5890 5891 @Override 5892 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 5893 insets = super.dispatchApplyWindowInsets(insets); 5894 if (!insets.isConsumed()) { 5895 final int count = getChildCount(); 5896 for (int i = 0; i < count; i++) { 5897 insets = getChildAt(i).dispatchApplyWindowInsets(insets); 5898 if (insets.isConsumed()) { 5899 break; 5900 } 5901 } 5902 } 5903 return insets; 5904 } 5905 5906 /** 5907 * Returns the animation listener to which layout animation events are 5908 * sent. 5909 * 5910 * @return an {@link android.view.animation.Animation.AnimationListener} 5911 */ 5912 public Animation.AnimationListener getLayoutAnimationListener() { 5913 return mAnimationListener; 5914 } 5915 5916 @Override 5917 protected void drawableStateChanged() { 5918 super.drawableStateChanged(); 5919 5920 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5921 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5922 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5923 + " child has duplicateParentState set to true"); 5924 } 5925 5926 final View[] children = mChildren; 5927 final int count = mChildrenCount; 5928 5929 for (int i = 0; i < count; i++) { 5930 final View child = children[i]; 5931 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5932 child.refreshDrawableState(); 5933 } 5934 } 5935 } 5936 } 5937 5938 @Override 5939 public void jumpDrawablesToCurrentState() { 5940 super.jumpDrawablesToCurrentState(); 5941 final View[] children = mChildren; 5942 final int count = mChildrenCount; 5943 for (int i = 0; i < count; i++) { 5944 children[i].jumpDrawablesToCurrentState(); 5945 } 5946 } 5947 5948 @Override 5949 public void drawableHotspotChanged(float x, float y) { 5950 super.drawableHotspotChanged(x, y); 5951 5952 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5953 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5954 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5955 + " child has duplicateParentState set to true"); 5956 } 5957 5958 final View[] children = mChildren; 5959 final int count = mChildrenCount; 5960 5961 for (int i = 0; i < count; i++) { 5962 final View child = children[i]; 5963 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5964 child.drawableHotspotChanged(x, y); 5965 } 5966 } 5967 } 5968 } 5969 5970 @Override 5971 protected int[] onCreateDrawableState(int extraSpace) { 5972 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5973 return super.onCreateDrawableState(extraSpace); 5974 } 5975 5976 int need = 0; 5977 int n = getChildCount(); 5978 for (int i = 0; i < n; i++) { 5979 int[] childState = getChildAt(i).getDrawableState(); 5980 5981 if (childState != null) { 5982 need += childState.length; 5983 } 5984 } 5985 5986 int[] state = super.onCreateDrawableState(extraSpace + need); 5987 5988 for (int i = 0; i < n; i++) { 5989 int[] childState = getChildAt(i).getDrawableState(); 5990 5991 if (childState != null) { 5992 state = mergeDrawableStates(state, childState); 5993 } 5994 } 5995 5996 return state; 5997 } 5998 5999 /** 6000 * Sets whether this ViewGroup's drawable states also include 6001 * its children's drawable states. This is used, for example, to 6002 * make a group appear to be focused when its child EditText or button 6003 * is focused. 6004 */ 6005 public void setAddStatesFromChildren(boolean addsStates) { 6006 if (addsStates) { 6007 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 6008 } else { 6009 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 6010 } 6011 6012 refreshDrawableState(); 6013 } 6014 6015 /** 6016 * Returns whether this ViewGroup's drawable states also include 6017 * its children's drawable states. This is used, for example, to 6018 * make a group appear to be focused when its child EditText or button 6019 * is focused. 6020 */ 6021 public boolean addStatesFromChildren() { 6022 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 6023 } 6024 6025 /** 6026 * If {@link #addStatesFromChildren} is true, refreshes this group's 6027 * drawable state (to include the states from its children). 6028 */ 6029 public void childDrawableStateChanged(View child) { 6030 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6031 refreshDrawableState(); 6032 } 6033 } 6034 6035 /** 6036 * Specifies the animation listener to which layout animation events must 6037 * be sent. Only 6038 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 6039 * and 6040 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 6041 * are invoked. 6042 * 6043 * @param animationListener the layout animation listener 6044 */ 6045 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 6046 mAnimationListener = animationListener; 6047 } 6048 6049 /** 6050 * This method is called by LayoutTransition when there are 'changing' animations that need 6051 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 6052 * starts all pending transitions prior to the drawing phase in the current traversal. 6053 * 6054 * @param transition The LayoutTransition to be started on the next traversal. 6055 * 6056 * @hide 6057 */ 6058 public void requestTransitionStart(LayoutTransition transition) { 6059 ViewRootImpl viewAncestor = getViewRootImpl(); 6060 if (viewAncestor != null) { 6061 viewAncestor.requestTransitionStart(transition); 6062 } 6063 } 6064 6065 /** 6066 * @hide 6067 */ 6068 @Override 6069 public boolean resolveRtlPropertiesIfNeeded() { 6070 final boolean result = super.resolveRtlPropertiesIfNeeded(); 6071 // We dont need to resolve the children RTL properties if nothing has changed for the parent 6072 if (result) { 6073 int count = getChildCount(); 6074 for (int i = 0; i < count; i++) { 6075 final View child = getChildAt(i); 6076 if (child.isLayoutDirectionInherited()) { 6077 child.resolveRtlPropertiesIfNeeded(); 6078 } 6079 } 6080 } 6081 return result; 6082 } 6083 6084 /** 6085 * @hide 6086 */ 6087 @Override 6088 public boolean resolveLayoutDirection() { 6089 final boolean result = super.resolveLayoutDirection(); 6090 if (result) { 6091 int count = getChildCount(); 6092 for (int i = 0; i < count; i++) { 6093 final View child = getChildAt(i); 6094 if (child.isLayoutDirectionInherited()) { 6095 child.resolveLayoutDirection(); 6096 } 6097 } 6098 } 6099 return result; 6100 } 6101 6102 /** 6103 * @hide 6104 */ 6105 @Override 6106 public boolean resolveTextDirection() { 6107 final boolean result = super.resolveTextDirection(); 6108 if (result) { 6109 int count = getChildCount(); 6110 for (int i = 0; i < count; i++) { 6111 final View child = getChildAt(i); 6112 if (child.isTextDirectionInherited()) { 6113 child.resolveTextDirection(); 6114 } 6115 } 6116 } 6117 return result; 6118 } 6119 6120 /** 6121 * @hide 6122 */ 6123 @Override 6124 public boolean resolveTextAlignment() { 6125 final boolean result = super.resolveTextAlignment(); 6126 if (result) { 6127 int count = getChildCount(); 6128 for (int i = 0; i < count; i++) { 6129 final View child = getChildAt(i); 6130 if (child.isTextAlignmentInherited()) { 6131 child.resolveTextAlignment(); 6132 } 6133 } 6134 } 6135 return result; 6136 } 6137 6138 /** 6139 * @hide 6140 */ 6141 @Override 6142 public void resolvePadding() { 6143 super.resolvePadding(); 6144 int count = getChildCount(); 6145 for (int i = 0; i < count; i++) { 6146 final View child = getChildAt(i); 6147 if (child.isLayoutDirectionInherited()) { 6148 child.resolvePadding(); 6149 } 6150 } 6151 } 6152 6153 /** 6154 * @hide 6155 */ 6156 @Override 6157 protected void resolveDrawables() { 6158 super.resolveDrawables(); 6159 int count = getChildCount(); 6160 for (int i = 0; i < count; i++) { 6161 final View child = getChildAt(i); 6162 if (child.isLayoutDirectionInherited()) { 6163 child.resolveDrawables(); 6164 } 6165 } 6166 } 6167 6168 /** 6169 * @hide 6170 */ 6171 @Override 6172 public void resolveLayoutParams() { 6173 super.resolveLayoutParams(); 6174 int count = getChildCount(); 6175 for (int i = 0; i < count; i++) { 6176 final View child = getChildAt(i); 6177 child.resolveLayoutParams(); 6178 } 6179 } 6180 6181 /** 6182 * @hide 6183 */ 6184 @Override 6185 public void resetResolvedLayoutDirection() { 6186 super.resetResolvedLayoutDirection(); 6187 6188 int count = getChildCount(); 6189 for (int i = 0; i < count; i++) { 6190 final View child = getChildAt(i); 6191 if (child.isLayoutDirectionInherited()) { 6192 child.resetResolvedLayoutDirection(); 6193 } 6194 } 6195 } 6196 6197 /** 6198 * @hide 6199 */ 6200 @Override 6201 public void resetResolvedTextDirection() { 6202 super.resetResolvedTextDirection(); 6203 6204 int count = getChildCount(); 6205 for (int i = 0; i < count; i++) { 6206 final View child = getChildAt(i); 6207 if (child.isTextDirectionInherited()) { 6208 child.resetResolvedTextDirection(); 6209 } 6210 } 6211 } 6212 6213 /** 6214 * @hide 6215 */ 6216 @Override 6217 public void resetResolvedTextAlignment() { 6218 super.resetResolvedTextAlignment(); 6219 6220 int count = getChildCount(); 6221 for (int i = 0; i < count; i++) { 6222 final View child = getChildAt(i); 6223 if (child.isTextAlignmentInherited()) { 6224 child.resetResolvedTextAlignment(); 6225 } 6226 } 6227 } 6228 6229 /** 6230 * @hide 6231 */ 6232 @Override 6233 public void resetResolvedPadding() { 6234 super.resetResolvedPadding(); 6235 6236 int count = getChildCount(); 6237 for (int i = 0; i < count; i++) { 6238 final View child = getChildAt(i); 6239 if (child.isLayoutDirectionInherited()) { 6240 child.resetResolvedPadding(); 6241 } 6242 } 6243 } 6244 6245 /** 6246 * @hide 6247 */ 6248 @Override 6249 protected void resetResolvedDrawables() { 6250 super.resetResolvedDrawables(); 6251 6252 int count = getChildCount(); 6253 for (int i = 0; i < count; i++) { 6254 final View child = getChildAt(i); 6255 if (child.isLayoutDirectionInherited()) { 6256 child.resetResolvedDrawables(); 6257 } 6258 } 6259 } 6260 6261 /** 6262 * Return true if the pressed state should be delayed for children or descendants of this 6263 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 6264 * This prevents the pressed state from appearing when the user is actually trying to scroll 6265 * the content. 6266 * 6267 * The default implementation returns true for compatibility reasons. Subclasses that do 6268 * not scroll should generally override this method and return false. 6269 */ 6270 public boolean shouldDelayChildPressedState() { 6271 return true; 6272 } 6273 6274 /** 6275 * @inheritDoc 6276 */ 6277 @Override 6278 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 6279 return false; 6280 } 6281 6282 /** 6283 * @inheritDoc 6284 */ 6285 @Override 6286 public void onNestedScrollAccepted(View child, View target, int axes) { 6287 mNestedScrollAxes = axes; 6288 } 6289 6290 /** 6291 * @inheritDoc 6292 * 6293 * <p>The default implementation of onStopNestedScroll calls 6294 * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p> 6295 */ 6296 @Override 6297 public void onStopNestedScroll(View child) { 6298 // Stop any recursive nested scrolling. 6299 stopNestedScroll(); 6300 } 6301 6302 /** 6303 * @inheritDoc 6304 */ 6305 @Override 6306 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 6307 int dxUnconsumed, int dyUnconsumed) { 6308 // Do nothing 6309 } 6310 6311 /** 6312 * @inheritDoc 6313 */ 6314 @Override 6315 public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 6316 // Do nothing 6317 } 6318 6319 /** 6320 * @inheritDoc 6321 */ 6322 @Override 6323 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 6324 return false; 6325 } 6326 6327 /** 6328 * @inheritDoc 6329 */ 6330 @Override 6331 public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 6332 return false; 6333 } 6334 6335 /** 6336 * Return the current axes of nested scrolling for this ViewGroup. 6337 * 6338 * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently 6339 * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p> 6340 * 6341 * @return Flags indicating the current axes of nested scrolling 6342 * @see #SCROLL_AXIS_HORIZONTAL 6343 * @see #SCROLL_AXIS_VERTICAL 6344 * @see #SCROLL_AXIS_NONE 6345 */ 6346 public int getNestedScrollAxes() { 6347 return mNestedScrollAxes; 6348 } 6349 6350 /** @hide */ 6351 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 6352 } 6353 6354 /** @hide */ 6355 @Override 6356 public void captureTransitioningViews(List<View> transitioningViews) { 6357 if (getVisibility() != View.VISIBLE) { 6358 return; 6359 } 6360 if (isTransitionGroup()) { 6361 transitioningViews.add(this); 6362 } else { 6363 int count = getChildCount(); 6364 for (int i = 0; i < count; i++) { 6365 View child = getChildAt(i); 6366 child.captureTransitioningViews(transitioningViews); 6367 } 6368 } 6369 } 6370 6371 /** @hide */ 6372 @Override 6373 public void findNamedViews(Map<String, View> namedElements) { 6374 if (getVisibility() != VISIBLE && mGhostView == null) { 6375 return; 6376 } 6377 super.findNamedViews(namedElements); 6378 int count = getChildCount(); 6379 for (int i = 0; i < count; i++) { 6380 View child = getChildAt(i); 6381 child.findNamedViews(namedElements); 6382 } 6383 } 6384 6385 /** 6386 * LayoutParams are used by views to tell their parents how they want to be 6387 * laid out. See 6388 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 6389 * for a list of all child view attributes that this class supports. 6390 * 6391 * <p> 6392 * The base LayoutParams class just describes how big the view wants to be 6393 * for both width and height. For each dimension, it can specify one of: 6394 * <ul> 6395 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 6396 * means that the view wants to be as big as its parent (minus padding) 6397 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 6398 * to enclose its content (plus padding) 6399 * <li> an exact number 6400 * </ul> 6401 * There are subclasses of LayoutParams for different subclasses of 6402 * ViewGroup. For example, AbsoluteLayout has its own subclass of 6403 * LayoutParams which adds an X and Y value.</p> 6404 * 6405 * <div class="special reference"> 6406 * <h3>Developer Guides</h3> 6407 * <p>For more information about creating user interface layouts, read the 6408 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 6409 * guide.</p></div> 6410 * 6411 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 6412 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 6413 */ 6414 public static class LayoutParams { 6415 /** 6416 * Special value for the height or width requested by a View. 6417 * FILL_PARENT means that the view wants to be as big as its parent, 6418 * minus the parent's padding, if any. This value is deprecated 6419 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 6420 */ 6421 @SuppressWarnings({"UnusedDeclaration"}) 6422 @Deprecated 6423 public static final int FILL_PARENT = -1; 6424 6425 /** 6426 * Special value for the height or width requested by a View. 6427 * MATCH_PARENT means that the view wants to be as big as its parent, 6428 * minus the parent's padding, if any. Introduced in API Level 8. 6429 */ 6430 public static final int MATCH_PARENT = -1; 6431 6432 /** 6433 * Special value for the height or width requested by a View. 6434 * WRAP_CONTENT means that the view wants to be just large enough to fit 6435 * its own internal content, taking its own padding into account. 6436 */ 6437 public static final int WRAP_CONTENT = -2; 6438 6439 /** 6440 * Information about how wide the view wants to be. Can be one of the 6441 * constants FILL_PARENT (replaced by MATCH_PARENT , 6442 * in API Level 8) or WRAP_CONTENT. or an exact size. 6443 */ 6444 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6445 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6446 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6447 }) 6448 public int width; 6449 6450 /** 6451 * Information about how tall the view wants to be. Can be one of the 6452 * constants FILL_PARENT (replaced by MATCH_PARENT , 6453 * in API Level 8) or WRAP_CONTENT. or an exact size. 6454 */ 6455 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6456 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6457 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6458 }) 6459 public int height; 6460 6461 /** 6462 * Used to animate layouts. 6463 */ 6464 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 6465 6466 /** 6467 * Creates a new set of layout parameters. The values are extracted from 6468 * the supplied attributes set and context. The XML attributes mapped 6469 * to this set of layout parameters are: 6470 * 6471 * <ul> 6472 * <li><code>layout_width</code>: the width, either an exact value, 6473 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6474 * {@link #MATCH_PARENT} in API Level 8)</li> 6475 * <li><code>layout_height</code>: the height, either an exact value, 6476 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6477 * {@link #MATCH_PARENT} in API Level 8)</li> 6478 * </ul> 6479 * 6480 * @param c the application environment 6481 * @param attrs the set of attributes from which to extract the layout 6482 * parameters' values 6483 */ 6484 public LayoutParams(Context c, AttributeSet attrs) { 6485 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 6486 setBaseAttributes(a, 6487 R.styleable.ViewGroup_Layout_layout_width, 6488 R.styleable.ViewGroup_Layout_layout_height); 6489 a.recycle(); 6490 } 6491 6492 /** 6493 * Creates a new set of layout parameters with the specified width 6494 * and height. 6495 * 6496 * @param width the width, either {@link #WRAP_CONTENT}, 6497 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6498 * API Level 8), or a fixed size in pixels 6499 * @param height the height, either {@link #WRAP_CONTENT}, 6500 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6501 * API Level 8), or a fixed size in pixels 6502 */ 6503 public LayoutParams(int width, int height) { 6504 this.width = width; 6505 this.height = height; 6506 } 6507 6508 /** 6509 * Copy constructor. Clones the width and height values of the source. 6510 * 6511 * @param source The layout params to copy from. 6512 */ 6513 public LayoutParams(LayoutParams source) { 6514 this.width = source.width; 6515 this.height = source.height; 6516 } 6517 6518 /** 6519 * Used internally by MarginLayoutParams. 6520 * @hide 6521 */ 6522 LayoutParams() { 6523 } 6524 6525 /** 6526 * Extracts the layout parameters from the supplied attributes. 6527 * 6528 * @param a the style attributes to extract the parameters from 6529 * @param widthAttr the identifier of the width attribute 6530 * @param heightAttr the identifier of the height attribute 6531 */ 6532 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6533 width = a.getLayoutDimension(widthAttr, "layout_width"); 6534 height = a.getLayoutDimension(heightAttr, "layout_height"); 6535 } 6536 6537 /** 6538 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6539 * layoutDirection changes should override this method. The default implementation does 6540 * nothing. 6541 * 6542 * @param layoutDirection the direction of the layout 6543 * 6544 * {@link View#LAYOUT_DIRECTION_LTR} 6545 * {@link View#LAYOUT_DIRECTION_RTL} 6546 */ 6547 public void resolveLayoutDirection(int layoutDirection) { 6548 } 6549 6550 /** 6551 * Returns a String representation of this set of layout parameters. 6552 * 6553 * @param output the String to prepend to the internal representation 6554 * @return a String with the following format: output + 6555 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6556 * 6557 * @hide 6558 */ 6559 public String debug(String output) { 6560 return output + "ViewGroup.LayoutParams={ width=" 6561 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6562 } 6563 6564 /** 6565 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6566 * 6567 * @param view the view that contains these layout parameters 6568 * @param canvas the canvas on which to draw 6569 * 6570 * @hide 6571 */ 6572 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6573 } 6574 6575 /** 6576 * Converts the specified size to a readable String. 6577 * 6578 * @param size the size to convert 6579 * @return a String instance representing the supplied size 6580 * 6581 * @hide 6582 */ 6583 protected static String sizeToString(int size) { 6584 if (size == WRAP_CONTENT) { 6585 return "wrap-content"; 6586 } 6587 if (size == MATCH_PARENT) { 6588 return "match-parent"; 6589 } 6590 return String.valueOf(size); 6591 } 6592 } 6593 6594 /** 6595 * Per-child layout information for layouts that support margins. 6596 * See 6597 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6598 * for a list of all child view attributes that this class supports. 6599 */ 6600 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6601 /** 6602 * The left margin in pixels of the child. Margin values should be positive. 6603 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6604 * to this field. 6605 */ 6606 @ViewDebug.ExportedProperty(category = "layout") 6607 public int leftMargin; 6608 6609 /** 6610 * The top margin in pixels of the child. Margin values should be positive. 6611 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6612 * to this field. 6613 */ 6614 @ViewDebug.ExportedProperty(category = "layout") 6615 public int topMargin; 6616 6617 /** 6618 * The right margin in pixels of the child. Margin values should be positive. 6619 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6620 * to this field. 6621 */ 6622 @ViewDebug.ExportedProperty(category = "layout") 6623 public int rightMargin; 6624 6625 /** 6626 * The bottom margin in pixels of the child. Margin values should be positive. 6627 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6628 * to this field. 6629 */ 6630 @ViewDebug.ExportedProperty(category = "layout") 6631 public int bottomMargin; 6632 6633 /** 6634 * The start margin in pixels of the child. Margin values should be positive. 6635 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6636 * to this field. 6637 */ 6638 @ViewDebug.ExportedProperty(category = "layout") 6639 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6640 6641 /** 6642 * The end margin in pixels of the child. Margin values should be positive. 6643 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6644 * to this field. 6645 */ 6646 @ViewDebug.ExportedProperty(category = "layout") 6647 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6648 6649 /** 6650 * The default start and end margin. 6651 * @hide 6652 */ 6653 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6654 6655 /** 6656 * Bit 0: layout direction 6657 * Bit 1: layout direction 6658 * Bit 2: left margin undefined 6659 * Bit 3: right margin undefined 6660 * Bit 4: is RTL compatibility mode 6661 * Bit 5: need resolution 6662 * 6663 * Bit 6 to 7 not used 6664 * 6665 * @hide 6666 */ 6667 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6668 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6669 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6670 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6671 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6672 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6673 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6674 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6675 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6676 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6677 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6678 }, formatToHexString = true) 6679 byte mMarginFlags; 6680 6681 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6682 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6683 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6684 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6685 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6686 6687 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6688 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6689 6690 /** 6691 * Creates a new set of layout parameters. The values are extracted from 6692 * the supplied attributes set and context. 6693 * 6694 * @param c the application environment 6695 * @param attrs the set of attributes from which to extract the layout 6696 * parameters' values 6697 */ 6698 public MarginLayoutParams(Context c, AttributeSet attrs) { 6699 super(); 6700 6701 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6702 setBaseAttributes(a, 6703 R.styleable.ViewGroup_MarginLayout_layout_width, 6704 R.styleable.ViewGroup_MarginLayout_layout_height); 6705 6706 int margin = a.getDimensionPixelSize( 6707 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6708 if (margin >= 0) { 6709 leftMargin = margin; 6710 topMargin = margin; 6711 rightMargin= margin; 6712 bottomMargin = margin; 6713 } else { 6714 leftMargin = a.getDimensionPixelSize( 6715 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6716 UNDEFINED_MARGIN); 6717 if (leftMargin == UNDEFINED_MARGIN) { 6718 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6719 leftMargin = DEFAULT_MARGIN_RESOLVED; 6720 } 6721 rightMargin = a.getDimensionPixelSize( 6722 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6723 UNDEFINED_MARGIN); 6724 if (rightMargin == UNDEFINED_MARGIN) { 6725 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6726 rightMargin = DEFAULT_MARGIN_RESOLVED; 6727 } 6728 6729 topMargin = a.getDimensionPixelSize( 6730 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6731 DEFAULT_MARGIN_RESOLVED); 6732 bottomMargin = a.getDimensionPixelSize( 6733 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6734 DEFAULT_MARGIN_RESOLVED); 6735 6736 startMargin = a.getDimensionPixelSize( 6737 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6738 DEFAULT_MARGIN_RELATIVE); 6739 endMargin = a.getDimensionPixelSize( 6740 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6741 DEFAULT_MARGIN_RELATIVE); 6742 6743 if (isMarginRelative()) { 6744 mMarginFlags |= NEED_RESOLUTION_MASK; 6745 } 6746 } 6747 6748 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6749 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6750 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6751 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6752 } 6753 6754 // Layout direction is LTR by default 6755 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6756 6757 a.recycle(); 6758 } 6759 6760 /** 6761 * {@inheritDoc} 6762 */ 6763 public MarginLayoutParams(int width, int height) { 6764 super(width, height); 6765 6766 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6767 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6768 6769 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6770 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6771 } 6772 6773 /** 6774 * Copy constructor. Clones the width, height and margin values of the source. 6775 * 6776 * @param source The layout params to copy from. 6777 */ 6778 public MarginLayoutParams(MarginLayoutParams source) { 6779 this.width = source.width; 6780 this.height = source.height; 6781 6782 this.leftMargin = source.leftMargin; 6783 this.topMargin = source.topMargin; 6784 this.rightMargin = source.rightMargin; 6785 this.bottomMargin = source.bottomMargin; 6786 this.startMargin = source.startMargin; 6787 this.endMargin = source.endMargin; 6788 6789 this.mMarginFlags = source.mMarginFlags; 6790 } 6791 6792 /** 6793 * {@inheritDoc} 6794 */ 6795 public MarginLayoutParams(LayoutParams source) { 6796 super(source); 6797 6798 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6799 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6800 6801 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6802 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6803 } 6804 6805 /** 6806 * @hide Used internally. 6807 */ 6808 public final void copyMarginsFrom(MarginLayoutParams source) { 6809 this.leftMargin = source.leftMargin; 6810 this.topMargin = source.topMargin; 6811 this.rightMargin = source.rightMargin; 6812 this.bottomMargin = source.bottomMargin; 6813 this.startMargin = source.startMargin; 6814 this.endMargin = source.endMargin; 6815 6816 this.mMarginFlags = source.mMarginFlags; 6817 } 6818 6819 /** 6820 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6821 * to be done so that the new margins are taken into account. Left and right margins may be 6822 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6823 * Margin values should be positive. 6824 * 6825 * @param left the left margin size 6826 * @param top the top margin size 6827 * @param right the right margin size 6828 * @param bottom the bottom margin size 6829 * 6830 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6831 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6832 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6833 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6834 */ 6835 public void setMargins(int left, int top, int right, int bottom) { 6836 leftMargin = left; 6837 topMargin = top; 6838 rightMargin = right; 6839 bottomMargin = bottom; 6840 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6841 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6842 if (isMarginRelative()) { 6843 mMarginFlags |= NEED_RESOLUTION_MASK; 6844 } else { 6845 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6846 } 6847 } 6848 6849 /** 6850 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6851 * needs to be done so that the new relative margins are taken into account. Left and right 6852 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6853 * direction. Margin values should be positive. 6854 * 6855 * @param start the start margin size 6856 * @param top the top margin size 6857 * @param end the right margin size 6858 * @param bottom the bottom margin size 6859 * 6860 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6861 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6862 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6863 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6864 * 6865 * @hide 6866 */ 6867 public void setMarginsRelative(int start, int top, int end, int bottom) { 6868 startMargin = start; 6869 topMargin = top; 6870 endMargin = end; 6871 bottomMargin = bottom; 6872 mMarginFlags |= NEED_RESOLUTION_MASK; 6873 } 6874 6875 /** 6876 * Sets the relative start margin. Margin values should be positive. 6877 * 6878 * @param start the start margin size 6879 * 6880 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6881 */ 6882 public void setMarginStart(int start) { 6883 startMargin = start; 6884 mMarginFlags |= NEED_RESOLUTION_MASK; 6885 } 6886 6887 /** 6888 * Returns the start margin in pixels. 6889 * 6890 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6891 * 6892 * @return the start margin in pixels. 6893 */ 6894 public int getMarginStart() { 6895 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6896 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6897 doResolveMargins(); 6898 } 6899 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6900 case View.LAYOUT_DIRECTION_RTL: 6901 return rightMargin; 6902 case View.LAYOUT_DIRECTION_LTR: 6903 default: 6904 return leftMargin; 6905 } 6906 } 6907 6908 /** 6909 * Sets the relative end margin. Margin values should be positive. 6910 * 6911 * @param end the end margin size 6912 * 6913 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6914 */ 6915 public void setMarginEnd(int end) { 6916 endMargin = end; 6917 mMarginFlags |= NEED_RESOLUTION_MASK; 6918 } 6919 6920 /** 6921 * Returns the end margin in pixels. 6922 * 6923 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6924 * 6925 * @return the end margin in pixels. 6926 */ 6927 public int getMarginEnd() { 6928 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6929 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6930 doResolveMargins(); 6931 } 6932 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6933 case View.LAYOUT_DIRECTION_RTL: 6934 return leftMargin; 6935 case View.LAYOUT_DIRECTION_LTR: 6936 default: 6937 return rightMargin; 6938 } 6939 } 6940 6941 /** 6942 * Check if margins are relative. 6943 * 6944 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6945 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6946 * 6947 * @return true if either marginStart or marginEnd has been set. 6948 */ 6949 public boolean isMarginRelative() { 6950 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6951 } 6952 6953 /** 6954 * Set the layout direction 6955 * @param layoutDirection the layout direction. 6956 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6957 * or {@link View#LAYOUT_DIRECTION_RTL}. 6958 */ 6959 public void setLayoutDirection(int layoutDirection) { 6960 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6961 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6962 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6963 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6964 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6965 if (isMarginRelative()) { 6966 mMarginFlags |= NEED_RESOLUTION_MASK; 6967 } else { 6968 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6969 } 6970 } 6971 } 6972 6973 /** 6974 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6975 * {@link View#LAYOUT_DIRECTION_RTL}. 6976 * 6977 * @return the layout direction. 6978 */ 6979 public int getLayoutDirection() { 6980 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6981 } 6982 6983 /** 6984 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6985 * may be overridden depending on layout direction. 6986 */ 6987 @Override 6988 public void resolveLayoutDirection(int layoutDirection) { 6989 setLayoutDirection(layoutDirection); 6990 6991 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6992 // Will use the left and right margins if no relative margin is defined. 6993 if (!isMarginRelative() || 6994 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6995 6996 // Proceed with resolution 6997 doResolveMargins(); 6998 } 6999 7000 private void doResolveMargins() { 7001 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 7002 // if left or right margins are not defined and if we have some start or end margin 7003 // defined then use those start and end margins. 7004 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 7005 && startMargin > DEFAULT_MARGIN_RELATIVE) { 7006 leftMargin = startMargin; 7007 } 7008 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 7009 && endMargin > DEFAULT_MARGIN_RELATIVE) { 7010 rightMargin = endMargin; 7011 } 7012 } else { 7013 // We have some relative margins (either the start one or the end one or both). So use 7014 // them and override what has been defined for left and right margins. If either start 7015 // or end margin is not defined, just set it to default "0". 7016 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7017 case View.LAYOUT_DIRECTION_RTL: 7018 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7019 endMargin : DEFAULT_MARGIN_RESOLVED; 7020 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7021 startMargin : DEFAULT_MARGIN_RESOLVED; 7022 break; 7023 case View.LAYOUT_DIRECTION_LTR: 7024 default: 7025 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7026 startMargin : DEFAULT_MARGIN_RESOLVED; 7027 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7028 endMargin : DEFAULT_MARGIN_RESOLVED; 7029 break; 7030 } 7031 } 7032 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7033 } 7034 7035 /** 7036 * @hide 7037 */ 7038 public boolean isLayoutRtl() { 7039 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 7040 } 7041 7042 /** 7043 * @hide 7044 */ 7045 @Override 7046 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 7047 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 7048 7049 fillDifference(canvas, 7050 view.getLeft() + oi.left, 7051 view.getTop() + oi.top, 7052 view.getRight() - oi.right, 7053 view.getBottom() - oi.bottom, 7054 leftMargin, 7055 topMargin, 7056 rightMargin, 7057 bottomMargin, 7058 paint); 7059 } 7060 } 7061 7062 /* Describes a touched view and the ids of the pointers that it has captured. 7063 * 7064 * This code assumes that pointer ids are always in the range 0..31 such that 7065 * it can use a bitfield to track which pointer ids are present. 7066 * As it happens, the lower layers of the input dispatch pipeline also use the 7067 * same trick so the assumption should be safe here... 7068 */ 7069 private static final class TouchTarget { 7070 private static final int MAX_RECYCLED = 32; 7071 private static final Object sRecycleLock = new Object[0]; 7072 private static TouchTarget sRecycleBin; 7073 private static int sRecycledCount; 7074 7075 public static final int ALL_POINTER_IDS = -1; // all ones 7076 7077 // The touched child view. 7078 public View child; 7079 7080 // The combined bit mask of pointer ids for all pointers captured by the target. 7081 public int pointerIdBits; 7082 7083 // The next target in the target list. 7084 public TouchTarget next; 7085 7086 private TouchTarget() { 7087 } 7088 7089 public static TouchTarget obtain(View child, int pointerIdBits) { 7090 final TouchTarget target; 7091 synchronized (sRecycleLock) { 7092 if (sRecycleBin == null) { 7093 target = new TouchTarget(); 7094 } else { 7095 target = sRecycleBin; 7096 sRecycleBin = target.next; 7097 sRecycledCount--; 7098 target.next = null; 7099 } 7100 } 7101 target.child = child; 7102 target.pointerIdBits = pointerIdBits; 7103 return target; 7104 } 7105 7106 public void recycle() { 7107 synchronized (sRecycleLock) { 7108 if (sRecycledCount < MAX_RECYCLED) { 7109 next = sRecycleBin; 7110 sRecycleBin = this; 7111 sRecycledCount += 1; 7112 } else { 7113 next = null; 7114 } 7115 child = null; 7116 } 7117 } 7118 } 7119 7120 /* Describes a hovered view. */ 7121 private static final class HoverTarget { 7122 private static final int MAX_RECYCLED = 32; 7123 private static final Object sRecycleLock = new Object[0]; 7124 private static HoverTarget sRecycleBin; 7125 private static int sRecycledCount; 7126 7127 // The hovered child view. 7128 public View child; 7129 7130 // The next target in the target list. 7131 public HoverTarget next; 7132 7133 private HoverTarget() { 7134 } 7135 7136 public static HoverTarget obtain(View child) { 7137 final HoverTarget target; 7138 synchronized (sRecycleLock) { 7139 if (sRecycleBin == null) { 7140 target = new HoverTarget(); 7141 } else { 7142 target = sRecycleBin; 7143 sRecycleBin = target.next; 7144 sRecycledCount--; 7145 target.next = null; 7146 } 7147 } 7148 target.child = child; 7149 return target; 7150 } 7151 7152 public void recycle() { 7153 synchronized (sRecycleLock) { 7154 if (sRecycledCount < MAX_RECYCLED) { 7155 next = sRecycleBin; 7156 sRecycleBin = this; 7157 sRecycledCount += 1; 7158 } else { 7159 next = null; 7160 } 7161 child = null; 7162 } 7163 } 7164 } 7165 7166 /** 7167 * Pooled class that orderes the children of a ViewGroup from start 7168 * to end based on how they are laid out and the layout direction. 7169 */ 7170 static class ChildListForAccessibility { 7171 7172 private static final int MAX_POOL_SIZE = 32; 7173 7174 private static final SynchronizedPool<ChildListForAccessibility> sPool = 7175 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 7176 7177 private final ArrayList<View> mChildren = new ArrayList<View>(); 7178 7179 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 7180 7181 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 7182 ChildListForAccessibility list = sPool.acquire(); 7183 if (list == null) { 7184 list = new ChildListForAccessibility(); 7185 } 7186 list.init(parent, sort); 7187 return list; 7188 } 7189 7190 public void recycle() { 7191 clear(); 7192 sPool.release(this); 7193 } 7194 7195 public int getChildCount() { 7196 return mChildren.size(); 7197 } 7198 7199 public View getChildAt(int index) { 7200 return mChildren.get(index); 7201 } 7202 7203 public int getChildIndex(View child) { 7204 return mChildren.indexOf(child); 7205 } 7206 7207 private void init(ViewGroup parent, boolean sort) { 7208 ArrayList<View> children = mChildren; 7209 final int childCount = parent.getChildCount(); 7210 for (int i = 0; i < childCount; i++) { 7211 View child = parent.getChildAt(i); 7212 children.add(child); 7213 } 7214 if (sort) { 7215 ArrayList<ViewLocationHolder> holders = mHolders; 7216 for (int i = 0; i < childCount; i++) { 7217 View child = children.get(i); 7218 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 7219 holders.add(holder); 7220 } 7221 sort(holders); 7222 for (int i = 0; i < childCount; i++) { 7223 ViewLocationHolder holder = holders.get(i); 7224 children.set(i, holder.mView); 7225 holder.recycle(); 7226 } 7227 holders.clear(); 7228 } 7229 } 7230 7231 private void sort(ArrayList<ViewLocationHolder> holders) { 7232 // This is gross but the least risky solution. The current comparison 7233 // strategy breaks transitivity but produces very good results. Coming 7234 // up with a new strategy requires time which we do not have, so ... 7235 try { 7236 ViewLocationHolder.setComparisonStrategy( 7237 ViewLocationHolder.COMPARISON_STRATEGY_STRIPE); 7238 Collections.sort(holders); 7239 } catch (IllegalArgumentException iae) { 7240 // Note that in practice this occurs extremely rarely in a couple 7241 // of pathological cases. 7242 ViewLocationHolder.setComparisonStrategy( 7243 ViewLocationHolder.COMPARISON_STRATEGY_LOCATION); 7244 Collections.sort(holders); 7245 } 7246 } 7247 7248 private void clear() { 7249 mChildren.clear(); 7250 } 7251 } 7252 7253 /** 7254 * Pooled class that holds a View and its location with respect to 7255 * a specified root. This enables sorting of views based on their 7256 * coordinates without recomputing the position relative to the root 7257 * on every comparison. 7258 */ 7259 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 7260 7261 private static final int MAX_POOL_SIZE = 32; 7262 7263 private static final SynchronizedPool<ViewLocationHolder> sPool = 7264 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 7265 7266 public static final int COMPARISON_STRATEGY_STRIPE = 1; 7267 7268 public static final int COMPARISON_STRATEGY_LOCATION = 2; 7269 7270 private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE; 7271 7272 private final Rect mLocation = new Rect(); 7273 7274 public View mView; 7275 7276 private int mLayoutDirection; 7277 7278 public static ViewLocationHolder obtain(ViewGroup root, View view) { 7279 ViewLocationHolder holder = sPool.acquire(); 7280 if (holder == null) { 7281 holder = new ViewLocationHolder(); 7282 } 7283 holder.init(root, view); 7284 return holder; 7285 } 7286 7287 public static void setComparisonStrategy(int strategy) { 7288 sComparisonStrategy = strategy; 7289 } 7290 7291 public void recycle() { 7292 clear(); 7293 sPool.release(this); 7294 } 7295 7296 @Override 7297 public int compareTo(ViewLocationHolder another) { 7298 // This instance is greater than an invalid argument. 7299 if (another == null) { 7300 return 1; 7301 } 7302 7303 if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { 7304 // First is above second. 7305 if (mLocation.bottom - another.mLocation.top <= 0) { 7306 return -1; 7307 } 7308 // First is below second. 7309 if (mLocation.top - another.mLocation.bottom >= 0) { 7310 return 1; 7311 } 7312 } 7313 7314 // We are ordering left-to-right, top-to-bottom. 7315 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 7316 final int leftDifference = mLocation.left - another.mLocation.left; 7317 if (leftDifference != 0) { 7318 return leftDifference; 7319 } 7320 } else { // RTL 7321 final int rightDifference = mLocation.right - another.mLocation.right; 7322 if (rightDifference != 0) { 7323 return -rightDifference; 7324 } 7325 } 7326 // We are ordering left-to-right, top-to-bottom. 7327 final int topDifference = mLocation.top - another.mLocation.top; 7328 if (topDifference != 0) { 7329 return topDifference; 7330 } 7331 // Break tie by height. 7332 final int heightDiference = mLocation.height() - another.mLocation.height(); 7333 if (heightDiference != 0) { 7334 return -heightDiference; 7335 } 7336 // Break tie by width. 7337 final int widthDiference = mLocation.width() - another.mLocation.width(); 7338 if (widthDiference != 0) { 7339 return -widthDiference; 7340 } 7341 // Just break the tie somehow. The accessibliity ids are unique 7342 // and stable, hence this is deterministic tie breaking. 7343 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 7344 } 7345 7346 private void init(ViewGroup root, View view) { 7347 Rect viewLocation = mLocation; 7348 view.getDrawingRect(viewLocation); 7349 root.offsetDescendantRectToMyCoords(view, viewLocation); 7350 mView = view; 7351 mLayoutDirection = root.getLayoutDirection(); 7352 } 7353 7354 private void clear() { 7355 mView = null; 7356 mLocation.set(0, 0, 0, 0); 7357 } 7358 } 7359 7360 private static Paint getDebugPaint() { 7361 if (sDebugPaint == null) { 7362 sDebugPaint = new Paint(); 7363 sDebugPaint.setAntiAlias(false); 7364 } 7365 return sDebugPaint; 7366 } 7367 7368 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 7369 if (sDebugLines== null) { 7370 // TODO: This won't work with multiple UI threads in a single process 7371 sDebugLines = new float[16]; 7372 } 7373 7374 sDebugLines[0] = x1; 7375 sDebugLines[1] = y1; 7376 sDebugLines[2] = x2; 7377 sDebugLines[3] = y1; 7378 7379 sDebugLines[4] = x2; 7380 sDebugLines[5] = y1; 7381 sDebugLines[6] = x2; 7382 sDebugLines[7] = y2; 7383 7384 sDebugLines[8] = x2; 7385 sDebugLines[9] = y2; 7386 sDebugLines[10] = x1; 7387 sDebugLines[11] = y2; 7388 7389 sDebugLines[12] = x1; 7390 sDebugLines[13] = y2; 7391 sDebugLines[14] = x1; 7392 sDebugLines[15] = y1; 7393 7394 canvas.drawLines(sDebugLines, paint); 7395 } 7396 7397 private final class OrderedChildIterator implements Iterator<View> { 7398 private List<View> mOrderedChildList; 7399 private boolean mUseCustomOrder; 7400 private int mCurrentIndex; 7401 private boolean mInitialized; 7402 7403 public void initialize() { 7404 mOrderedChildList = buildOrderedChildList(); 7405 mUseCustomOrder = (mOrderedChildList == null) 7406 && isChildrenDrawingOrderEnabled(); 7407 mCurrentIndex = mChildrenCount - 1; 7408 mInitialized = true; 7409 } 7410 7411 public void release() { 7412 if (mOrderedChildList != null) { 7413 mOrderedChildList.clear(); 7414 } 7415 mUseCustomOrder = false; 7416 mCurrentIndex = 0; 7417 mInitialized = false; 7418 } 7419 7420 public boolean isInitialized() { 7421 return mInitialized; 7422 } 7423 7424 @Override 7425 public boolean hasNext() { 7426 return (mCurrentIndex >= 0); 7427 } 7428 7429 @Override 7430 public View next() { 7431 if (!hasNext()) { 7432 throw new NoSuchElementException("No such element"); 7433 } 7434 return getChild(mCurrentIndex--); 7435 } 7436 7437 private View getChild(int index) { 7438 final int childIndex = mUseCustomOrder 7439 ? getChildDrawingOrder(mChildrenCount, index) : index; 7440 return (mOrderedChildList == null) 7441 ? mChildren[childIndex] : mOrderedChildList.get(childIndex); 7442 } 7443 7444 @Override 7445 public void remove() { 7446 throw new UnsupportedOperationException(); 7447 } 7448 } 7449} 7450