ViewGroup.java revision 6410c0aaf13c9aec606b90ee942f2ac2d98b1609
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.Pools.SynchronizedPool; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.accessibility.AccessibilityNodeInfo; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import com.android.internal.R; 48import com.android.internal.util.Predicate; 49 50import java.util.ArrayList; 51import java.util.Collections; 52import java.util.HashSet; 53 54import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 55 56/** 57 * <p> 58 * A <code>ViewGroup</code> is a special view that can contain other views 59 * (called children.) The view group is the base class for layouts and views 60 * containers. This class also defines the 61 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 62 * class for layouts parameters. 63 * </p> 64 * 65 * <p> 66 * Also see {@link LayoutParams} for layout attributes. 67 * </p> 68 * 69 * <div class="special reference"> 70 * <h3>Developer Guides</h3> 71 * <p>For more information about creating user interface layouts, read the 72 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 73 * guide.</p></div> 74 * 75 * <p>Here is a complete implementation of a custom ViewGroup that implements 76 * a simple {@link android.widget.FrameLayout} along with the ability to stack 77 * children in left and right gutters.</p> 78 * 79 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 80 * Complete} 81 * 82 * <p>If you are implementing XML layout attributes as shown in the example, this is the 83 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 84 * 85 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 86 * 87 * <p>Finally the layout manager can be used in an XML layout like so:</p> 88 * 89 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 90 * 91 * @attr ref android.R.styleable#ViewGroup_clipChildren 92 * @attr ref android.R.styleable#ViewGroup_clipToPadding 93 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 94 * @attr ref android.R.styleable#ViewGroup_animationCache 95 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 96 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 97 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 98 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 99 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 100 */ 101public abstract class ViewGroup extends View implements ViewParent, ViewManager { 102 private static final String TAG = "ViewGroup"; 103 104 private static final boolean DBG = false; 105 /** @hide */ 106 public static boolean DEBUG_DRAW = false; 107 108 /** 109 * Views which have been hidden or removed which need to be animated on 110 * their way out. 111 * This field should be made private, so it is hidden from the SDK. 112 * {@hide} 113 */ 114 protected ArrayList<View> mDisappearingChildren; 115 116 /** 117 * Listener used to propagate events indicating when children are added 118 * and/or removed from a view group. 119 * This field should be made private, so it is hidden from the SDK. 120 * {@hide} 121 */ 122 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 123 124 // The view contained within this ViewGroup that has or contains focus. 125 private View mFocused; 126 127 /** 128 * A Transformation used when drawing children, to 129 * apply on the child being drawn. 130 */ 131 private Transformation mChildTransformation; 132 133 /** 134 * Used to track the current invalidation region. 135 */ 136 RectF mInvalidateRegion; 137 138 /** 139 * A Transformation used to calculate a correct 140 * invalidation area when the application is autoscaled. 141 */ 142 Transformation mInvalidationTransformation; 143 144 // View currently under an ongoing drag 145 private View mCurrentDragView; 146 147 // Metadata about the ongoing drag 148 private DragEvent mCurrentDrag; 149 private HashSet<View> mDragNotifiedChildren; 150 151 // Does this group have a child that can accept the current drag payload? 152 private boolean mChildAcceptsDrag; 153 154 // Used during drag dispatch 155 private PointF mLocalPoint; 156 157 // Layout animation 158 private LayoutAnimationController mLayoutAnimationController; 159 private Animation.AnimationListener mAnimationListener; 160 161 // First touch target in the linked list of touch targets. 162 private TouchTarget mFirstTouchTarget; 163 164 // For debugging only. You can see these in hierarchyviewer. 165 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 166 @ViewDebug.ExportedProperty(category = "events") 167 private long mLastTouchDownTime; 168 @ViewDebug.ExportedProperty(category = "events") 169 private int mLastTouchDownIndex = -1; 170 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 171 @ViewDebug.ExportedProperty(category = "events") 172 private float mLastTouchDownX; 173 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 174 @ViewDebug.ExportedProperty(category = "events") 175 private float mLastTouchDownY; 176 177 // First hover target in the linked list of hover targets. 178 // The hover targets are children which have received ACTION_HOVER_ENTER. 179 // They might not have actually handled the hover event, but we will 180 // continue sending hover events to them as long as the pointer remains over 181 // their bounds and the view group does not intercept hover. 182 private HoverTarget mFirstHoverTarget; 183 184 // True if the view group itself received a hover event. 185 // It might not have actually handled the hover event. 186 private boolean mHoveredSelf; 187 188 /** 189 * Internal flags. 190 * 191 * This field should be made private, so it is hidden from the SDK. 192 * {@hide} 193 */ 194 @ViewDebug.ExportedProperty(flagMapping = { 195 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 196 name = "CLIP_CHILDREN"), 197 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 198 name = "CLIP_TO_PADDING"), 199 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 200 name = "PADDING_NOT_NULL") 201 }) 202 protected int mGroupFlags; 203 204 /** 205 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 206 */ 207 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 208 209 /** 210 * NOTE: If you change the flags below make sure to reflect the changes 211 * the DisplayList class 212 */ 213 214 // When set, ViewGroup invalidates only the child's rectangle 215 // Set by default 216 static final int FLAG_CLIP_CHILDREN = 0x1; 217 218 // When set, ViewGroup excludes the padding area from the invalidate rectangle 219 // Set by default 220 private static final int FLAG_CLIP_TO_PADDING = 0x2; 221 222 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 223 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 224 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 225 226 // When set, dispatchDraw() will run the layout animation and unset the flag 227 private static final int FLAG_RUN_ANIMATION = 0x8; 228 229 // When set, there is either no layout animation on the ViewGroup or the layout 230 // animation is over 231 // Set by default 232 static final int FLAG_ANIMATION_DONE = 0x10; 233 234 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 235 // to clip it, even if FLAG_CLIP_TO_PADDING is set 236 private static final int FLAG_PADDING_NOT_NULL = 0x20; 237 238 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 239 // Set by default 240 private static final int FLAG_ANIMATION_CACHE = 0x40; 241 242 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 243 // layout animation; this avoid clobbering the hierarchy 244 // Automatically set when the layout animation starts, depending on the animation's 245 // characteristics 246 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 247 248 // When set, the next call to drawChild() will clear mChildTransformation's matrix 249 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 250 251 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 252 // the children's Bitmap caches if necessary 253 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 254 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 255 256 /** 257 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 258 * to get the index of the child to draw for that iteration. 259 * 260 * @hide 261 */ 262 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 263 264 /** 265 * When set, this ViewGroup supports static transformations on children; this causes 266 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 267 * invoked when a child is drawn. 268 * 269 * Any subclass overriding 270 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 271 * set this flags in {@link #mGroupFlags}. 272 * 273 * {@hide} 274 */ 275 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 276 277 // When the previous drawChild() invocation used an alpha value that was lower than 278 // 1.0 and set it in mCachePaint 279 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 280 281 /** 282 * When set, this ViewGroup's drawable states also include those 283 * of its children. 284 */ 285 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 286 287 /** 288 * When set, this ViewGroup tries to always draw its children using their drawing cache. 289 */ 290 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 291 292 /** 293 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 294 * draw its children with their drawing cache. 295 */ 296 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 297 298 /** 299 * When set, this group will go through its list of children to notify them of 300 * any drawable state change. 301 */ 302 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 303 304 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 305 306 /** 307 * This view will get focus before any of its descendants. 308 */ 309 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 310 311 /** 312 * This view will get focus only if none of its descendants want it. 313 */ 314 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 315 316 /** 317 * This view will block any of its descendants from getting focus, even 318 * if they are focusable. 319 */ 320 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 321 322 /** 323 * Used to map between enum in attrubutes and flag values. 324 */ 325 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 326 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 327 FOCUS_BLOCK_DESCENDANTS}; 328 329 /** 330 * When set, this ViewGroup should not intercept touch events. 331 * {@hide} 332 */ 333 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 334 335 /** 336 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 337 */ 338 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 339 340 /** 341 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 342 * to children when adding new views. This is used to prevent multiple 343 * onAttached calls when a ViewGroup adds children in its own onAttached method. 344 */ 345 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 346 347 /** 348 * When true, indicates that a layoutMode has been explicitly set, either with 349 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 350 * This distinguishes the situation in which a layout mode was inherited from 351 * one of the ViewGroup's ancestors and cached locally. 352 */ 353 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 354 355 /** 356 * Indicates which types of drawing caches are to be kept in memory. 357 * This field should be made private, so it is hidden from the SDK. 358 * {@hide} 359 */ 360 protected int mPersistentDrawingCache; 361 362 /** 363 * Used to indicate that no drawing cache should be kept in memory. 364 */ 365 public static final int PERSISTENT_NO_CACHE = 0x0; 366 367 /** 368 * Used to indicate that the animation drawing cache should be kept in memory. 369 */ 370 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 371 372 /** 373 * Used to indicate that the scrolling drawing cache should be kept in memory. 374 */ 375 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 376 377 /** 378 * Used to indicate that all drawing caches should be kept in memory. 379 */ 380 public static final int PERSISTENT_ALL_CACHES = 0x3; 381 382 // Layout Modes 383 384 private static final int LAYOUT_MODE_UNDEFINED = -1; 385 386 /** 387 * This constant is a {@link #setLayoutMode(int) layoutMode}. 388 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 389 * {@link #getRight() right} and {@link #getBottom() bottom}. 390 */ 391 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 392 393 /** 394 * This constant is a {@link #setLayoutMode(int) layoutMode}. 395 * Optical bounds describe where a widget appears to be. They sit inside the clip 396 * bounds which need to cover a larger area to allow other effects, 397 * such as shadows and glows, to be drawn. 398 */ 399 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 400 401 /** @hide */ 402 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 403 404 /** 405 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 406 * are set at the same time. 407 */ 408 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 409 410 // Index of the child's left position in the mLocation array 411 private static final int CHILD_LEFT_INDEX = 0; 412 // Index of the child's top position in the mLocation array 413 private static final int CHILD_TOP_INDEX = 1; 414 415 // Child views of this ViewGroup 416 private View[] mChildren; 417 // Number of valid children in the mChildren array, the rest should be null or not 418 // considered as children 419 private int mChildrenCount; 420 421 // Whether layout calls are currently being suppressed, controlled by calls to 422 // suppressLayout() 423 boolean mSuppressLayout = false; 424 425 // Whether any layout calls have actually been suppressed while mSuppressLayout 426 // has been true. This tracks whether we need to issue a requestLayout() when 427 // layout is later re-enabled. 428 private boolean mLayoutCalledWhileSuppressed = false; 429 430 private static final int ARRAY_INITIAL_CAPACITY = 12; 431 private static final int ARRAY_CAPACITY_INCREMENT = 12; 432 433 private static Paint sDebugPaint; 434 private static float[] sDebugLines; 435 436 // Used to draw cached views 437 Paint mCachePaint; 438 439 // Used to animate add/remove changes in layout 440 private LayoutTransition mTransition; 441 442 // The set of views that are currently being transitioned. This list is used to track views 443 // being removed that should not actually be removed from the parent yet because they are 444 // being animated. 445 private ArrayList<View> mTransitioningViews; 446 447 // List of children changing visibility. This is used to potentially keep rendering 448 // views during a transition when they otherwise would have become gone/invisible 449 private ArrayList<View> mVisibilityChangingChildren; 450 451 // Indicates how many of this container's child subtrees contain transient state 452 @ViewDebug.ExportedProperty(category = "layout") 453 private int mChildCountWithTransientState = 0; 454 455 public ViewGroup(Context context) { 456 super(context); 457 initViewGroup(); 458 } 459 460 public ViewGroup(Context context, AttributeSet attrs) { 461 super(context, attrs); 462 initViewGroup(); 463 initFromAttributes(context, attrs); 464 } 465 466 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 467 super(context, attrs, defStyle); 468 initViewGroup(); 469 initFromAttributes(context, attrs); 470 } 471 472 private boolean debugDraw() { 473 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 474 } 475 476 private void initViewGroup() { 477 // ViewGroup doesn't draw by default 478 if (!debugDraw()) { 479 setFlags(WILL_NOT_DRAW, DRAW_MASK); 480 } 481 mGroupFlags |= FLAG_CLIP_CHILDREN; 482 mGroupFlags |= FLAG_CLIP_TO_PADDING; 483 mGroupFlags |= FLAG_ANIMATION_DONE; 484 mGroupFlags |= FLAG_ANIMATION_CACHE; 485 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 486 487 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 488 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 489 } 490 491 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 492 493 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 494 mChildrenCount = 0; 495 496 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 497 } 498 499 private void initFromAttributes(Context context, AttributeSet attrs) { 500 TypedArray a = context.obtainStyledAttributes(attrs, 501 R.styleable.ViewGroup); 502 503 final int N = a.getIndexCount(); 504 for (int i = 0; i < N; i++) { 505 int attr = a.getIndex(i); 506 switch (attr) { 507 case R.styleable.ViewGroup_clipChildren: 508 setClipChildren(a.getBoolean(attr, true)); 509 break; 510 case R.styleable.ViewGroup_clipToPadding: 511 setClipToPadding(a.getBoolean(attr, true)); 512 break; 513 case R.styleable.ViewGroup_animationCache: 514 setAnimationCacheEnabled(a.getBoolean(attr, true)); 515 break; 516 case R.styleable.ViewGroup_persistentDrawingCache: 517 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 518 break; 519 case R.styleable.ViewGroup_addStatesFromChildren: 520 setAddStatesFromChildren(a.getBoolean(attr, false)); 521 break; 522 case R.styleable.ViewGroup_alwaysDrawnWithCache: 523 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 524 break; 525 case R.styleable.ViewGroup_layoutAnimation: 526 int id = a.getResourceId(attr, -1); 527 if (id > 0) { 528 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 529 } 530 break; 531 case R.styleable.ViewGroup_descendantFocusability: 532 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 533 break; 534 case R.styleable.ViewGroup_splitMotionEvents: 535 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 536 break; 537 case R.styleable.ViewGroup_animateLayoutChanges: 538 boolean animateLayoutChanges = a.getBoolean(attr, false); 539 if (animateLayoutChanges) { 540 setLayoutTransition(new LayoutTransition()); 541 } 542 break; 543 case R.styleable.ViewGroup_layoutMode: 544 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 545 break; 546 } 547 } 548 549 a.recycle(); 550 } 551 552 /** 553 * Gets the descendant focusability of this view group. The descendant 554 * focusability defines the relationship between this view group and its 555 * descendants when looking for a view to take focus in 556 * {@link #requestFocus(int, android.graphics.Rect)}. 557 * 558 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 559 * {@link #FOCUS_BLOCK_DESCENDANTS}. 560 */ 561 @ViewDebug.ExportedProperty(category = "focus", mapping = { 562 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 563 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 564 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 565 }) 566 public int getDescendantFocusability() { 567 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 568 } 569 570 /** 571 * Set the descendant focusability of this view group. This defines the relationship 572 * between this view group and its descendants when looking for a view to 573 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 574 * 575 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 576 * {@link #FOCUS_BLOCK_DESCENDANTS}. 577 */ 578 public void setDescendantFocusability(int focusability) { 579 switch (focusability) { 580 case FOCUS_BEFORE_DESCENDANTS: 581 case FOCUS_AFTER_DESCENDANTS: 582 case FOCUS_BLOCK_DESCENDANTS: 583 break; 584 default: 585 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 586 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 587 } 588 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 589 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 590 } 591 592 /** 593 * {@inheritDoc} 594 */ 595 @Override 596 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 597 if (mFocused != null) { 598 mFocused.unFocus(); 599 mFocused = null; 600 } 601 super.handleFocusGainInternal(direction, previouslyFocusedRect); 602 } 603 604 /** 605 * {@inheritDoc} 606 */ 607 public void requestChildFocus(View child, View focused) { 608 if (DBG) { 609 System.out.println(this + " requestChildFocus()"); 610 } 611 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 612 return; 613 } 614 615 // Unfocus us, if necessary 616 super.unFocus(); 617 618 // We had a previous notion of who had focus. Clear it. 619 if (mFocused != child) { 620 if (mFocused != null) { 621 mFocused.unFocus(); 622 } 623 624 mFocused = child; 625 } 626 if (mParent != null) { 627 mParent.requestChildFocus(this, focused); 628 } 629 } 630 631 /** 632 * {@inheritDoc} 633 */ 634 public void focusableViewAvailable(View v) { 635 if (mParent != null 636 // shortcut: don't report a new focusable view if we block our descendants from 637 // getting focus 638 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 639 // shortcut: don't report a new focusable view if we already are focused 640 // (and we don't prefer our descendants) 641 // 642 // note: knowing that mFocused is non-null is not a good enough reason 643 // to break the traversal since in that case we'd actually have to find 644 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 645 // an ancestor of v; this will get checked for at ViewAncestor 646 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 647 mParent.focusableViewAvailable(v); 648 } 649 } 650 651 /** 652 * {@inheritDoc} 653 */ 654 public boolean showContextMenuForChild(View originalView) { 655 return mParent != null && mParent.showContextMenuForChild(originalView); 656 } 657 658 /** 659 * {@inheritDoc} 660 */ 661 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 662 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 663 } 664 665 /** 666 * Find the nearest view in the specified direction that wants to take 667 * focus. 668 * 669 * @param focused The view that currently has focus 670 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 671 * FOCUS_RIGHT, or 0 for not applicable. 672 */ 673 public View focusSearch(View focused, int direction) { 674 if (isRootNamespace()) { 675 // root namespace means we should consider ourselves the top of the 676 // tree for focus searching; otherwise we could be focus searching 677 // into other tabs. see LocalActivityManager and TabHost for more info 678 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 679 } else if (mParent != null) { 680 return mParent.focusSearch(focused, direction); 681 } 682 return null; 683 } 684 685 /** 686 * {@inheritDoc} 687 */ 688 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 689 return false; 690 } 691 692 /** 693 * {@inheritDoc} 694 */ 695 @Override 696 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 697 ViewParent parent = mParent; 698 if (parent == null) { 699 return false; 700 } 701 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 702 if (!propagate) { 703 return false; 704 } 705 return parent.requestSendAccessibilityEvent(this, event); 706 } 707 708 /** 709 * Called when a child has requested sending an {@link AccessibilityEvent} and 710 * gives an opportunity to its parent to augment the event. 711 * <p> 712 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 713 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 714 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 715 * is responsible for handling this call. 716 * </p> 717 * 718 * @param child The child which requests sending the event. 719 * @param event The event to be sent. 720 * @return True if the event should be sent. 721 * 722 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 723 */ 724 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 725 if (mAccessibilityDelegate != null) { 726 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 727 } else { 728 return onRequestSendAccessibilityEventInternal(child, event); 729 } 730 } 731 732 /** 733 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 734 * 735 * Note: Called from the default {@link View.AccessibilityDelegate}. 736 */ 737 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 738 return true; 739 } 740 741 /** 742 * Called when a child view has changed whether or not it is tracking transient state. 743 * 744 * @hide 745 */ 746 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 747 final boolean oldHasTransientState = hasTransientState(); 748 if (childHasTransientState) { 749 mChildCountWithTransientState++; 750 } else { 751 mChildCountWithTransientState--; 752 } 753 754 final boolean newHasTransientState = hasTransientState(); 755 if (mParent != null && oldHasTransientState != newHasTransientState) { 756 try { 757 mParent.childHasTransientStateChanged(this, newHasTransientState); 758 } catch (AbstractMethodError e) { 759 Log.e(TAG, mParent.getClass().getSimpleName() + 760 " does not fully implement ViewParent", e); 761 } 762 } 763 } 764 765 /** 766 * @hide 767 */ 768 @Override 769 public boolean hasTransientState() { 770 return mChildCountWithTransientState > 0 || super.hasTransientState(); 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public boolean dispatchUnhandledMove(View focused, int direction) { 778 return mFocused != null && 779 mFocused.dispatchUnhandledMove(focused, direction); 780 } 781 782 /** 783 * {@inheritDoc} 784 */ 785 public void clearChildFocus(View child) { 786 if (DBG) { 787 System.out.println(this + " clearChildFocus()"); 788 } 789 790 mFocused = null; 791 if (mParent != null) { 792 mParent.clearChildFocus(this); 793 } 794 } 795 796 /** 797 * {@inheritDoc} 798 */ 799 @Override 800 public void clearFocus() { 801 if (DBG) { 802 System.out.println(this + " clearFocus()"); 803 } 804 if (mFocused == null) { 805 super.clearFocus(); 806 } else { 807 View focused = mFocused; 808 mFocused = null; 809 focused.clearFocus(); 810 } 811 } 812 813 /** 814 * {@inheritDoc} 815 */ 816 @Override 817 void unFocus() { 818 if (DBG) { 819 System.out.println(this + " unFocus()"); 820 } 821 if (mFocused == null) { 822 super.unFocus(); 823 } else { 824 mFocused.unFocus(); 825 mFocused = null; 826 } 827 } 828 829 /** 830 * Returns the focused child of this view, if any. The child may have focus 831 * or contain focus. 832 * 833 * @return the focused child or null. 834 */ 835 public View getFocusedChild() { 836 return mFocused; 837 } 838 839 /** 840 * Returns true if this view has or contains focus 841 * 842 * @return true if this view has or contains focus 843 */ 844 @Override 845 public boolean hasFocus() { 846 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 847 } 848 849 /* 850 * (non-Javadoc) 851 * 852 * @see android.view.View#findFocus() 853 */ 854 @Override 855 public View findFocus() { 856 if (DBG) { 857 System.out.println("Find focus in " + this + ": flags=" 858 + isFocused() + ", child=" + mFocused); 859 } 860 861 if (isFocused()) { 862 return this; 863 } 864 865 if (mFocused != null) { 866 return mFocused.findFocus(); 867 } 868 return null; 869 } 870 871 /** 872 * {@inheritDoc} 873 */ 874 @Override 875 public boolean hasFocusable() { 876 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 877 return false; 878 } 879 880 if (isFocusable()) { 881 return true; 882 } 883 884 final int descendantFocusability = getDescendantFocusability(); 885 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 886 final int count = mChildrenCount; 887 final View[] children = mChildren; 888 889 for (int i = 0; i < count; i++) { 890 final View child = children[i]; 891 if (child.hasFocusable()) { 892 return true; 893 } 894 } 895 } 896 897 return false; 898 } 899 900 /** 901 * {@inheritDoc} 902 */ 903 @Override 904 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 905 final int focusableCount = views.size(); 906 907 final int descendantFocusability = getDescendantFocusability(); 908 909 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 910 final int count = mChildrenCount; 911 final View[] children = mChildren; 912 913 for (int i = 0; i < count; i++) { 914 final View child = children[i]; 915 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 916 child.addFocusables(views, direction, focusableMode); 917 } 918 } 919 } 920 921 // we add ourselves (if focusable) in all cases except for when we are 922 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 923 // to avoid the focus search finding layouts when a more precise search 924 // among the focusable children would be more interesting. 925 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 926 // No focusable descendants 927 || (focusableCount == views.size())) { 928 super.addFocusables(views, direction, focusableMode); 929 } 930 } 931 932 @Override 933 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 934 super.findViewsWithText(outViews, text, flags); 935 final int childrenCount = mChildrenCount; 936 final View[] children = mChildren; 937 for (int i = 0; i < childrenCount; i++) { 938 View child = children[i]; 939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 940 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 941 child.findViewsWithText(outViews, text, flags); 942 } 943 } 944 } 945 946 /** @hide */ 947 @Override 948 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 949 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 950 if (foundView != null) { 951 return foundView; 952 } 953 final int childrenCount = mChildrenCount; 954 final View[] children = mChildren; 955 for (int i = 0; i < childrenCount; i++) { 956 View child = children[i]; 957 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 958 if (foundView != null) { 959 return foundView; 960 } 961 } 962 return null; 963 } 964 965 /** 966 * {@inheritDoc} 967 */ 968 @Override 969 public void dispatchWindowFocusChanged(boolean hasFocus) { 970 super.dispatchWindowFocusChanged(hasFocus); 971 final int count = mChildrenCount; 972 final View[] children = mChildren; 973 for (int i = 0; i < count; i++) { 974 children[i].dispatchWindowFocusChanged(hasFocus); 975 } 976 } 977 978 /** 979 * {@inheritDoc} 980 */ 981 @Override 982 public void addTouchables(ArrayList<View> views) { 983 super.addTouchables(views); 984 985 final int count = mChildrenCount; 986 final View[] children = mChildren; 987 988 for (int i = 0; i < count; i++) { 989 final View child = children[i]; 990 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 991 child.addTouchables(views); 992 } 993 } 994 } 995 996 /** 997 * @hide 998 */ 999 @Override 1000 public void makeOptionalFitsSystemWindows() { 1001 super.makeOptionalFitsSystemWindows(); 1002 final int count = mChildrenCount; 1003 final View[] children = mChildren; 1004 for (int i = 0; i < count; i++) { 1005 children[i].makeOptionalFitsSystemWindows(); 1006 } 1007 } 1008 1009 /** 1010 * {@inheritDoc} 1011 */ 1012 @Override 1013 public void dispatchDisplayHint(int hint) { 1014 super.dispatchDisplayHint(hint); 1015 final int count = mChildrenCount; 1016 final View[] children = mChildren; 1017 for (int i = 0; i < count; i++) { 1018 children[i].dispatchDisplayHint(hint); 1019 } 1020 } 1021 1022 /** 1023 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1024 * action. 1025 * 1026 * @param child The view whose visibility has changed 1027 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1028 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1029 * @hide 1030 */ 1031 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1032 if (mTransition != null) { 1033 if (newVisibility == VISIBLE) { 1034 mTransition.showChild(this, child, oldVisibility); 1035 } else { 1036 mTransition.hideChild(this, child, newVisibility); 1037 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1038 // Only track this on disappearing views - appearing views are already visible 1039 // and don't need special handling during drawChild() 1040 if (mVisibilityChangingChildren == null) { 1041 mVisibilityChangingChildren = new ArrayList<View>(); 1042 } 1043 mVisibilityChangingChildren.add(child); 1044 addDisappearingView(child); 1045 } 1046 } 1047 } 1048 1049 // in all cases, for drags 1050 if (mCurrentDrag != null) { 1051 if (newVisibility == VISIBLE) { 1052 notifyChildOfDrag(child); 1053 } 1054 } 1055 } 1056 1057 /** 1058 * {@inheritDoc} 1059 */ 1060 @Override 1061 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1062 super.dispatchVisibilityChanged(changedView, visibility); 1063 final int count = mChildrenCount; 1064 final View[] children = mChildren; 1065 for (int i = 0; i < count; i++) { 1066 children[i].dispatchVisibilityChanged(changedView, visibility); 1067 } 1068 } 1069 1070 /** 1071 * {@inheritDoc} 1072 */ 1073 @Override 1074 public void dispatchWindowVisibilityChanged(int visibility) { 1075 super.dispatchWindowVisibilityChanged(visibility); 1076 final int count = mChildrenCount; 1077 final View[] children = mChildren; 1078 for (int i = 0; i < count; i++) { 1079 children[i].dispatchWindowVisibilityChanged(visibility); 1080 } 1081 } 1082 1083 /** 1084 * {@inheritDoc} 1085 */ 1086 @Override 1087 public void dispatchConfigurationChanged(Configuration newConfig) { 1088 super.dispatchConfigurationChanged(newConfig); 1089 final int count = mChildrenCount; 1090 final View[] children = mChildren; 1091 for (int i = 0; i < count; i++) { 1092 children[i].dispatchConfigurationChanged(newConfig); 1093 } 1094 } 1095 1096 /** 1097 * {@inheritDoc} 1098 */ 1099 public void recomputeViewAttributes(View child) { 1100 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1101 ViewParent parent = mParent; 1102 if (parent != null) parent.recomputeViewAttributes(this); 1103 } 1104 } 1105 1106 @Override 1107 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1108 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1109 super.dispatchCollectViewAttributes(attachInfo, visibility); 1110 final int count = mChildrenCount; 1111 final View[] children = mChildren; 1112 for (int i = 0; i < count; i++) { 1113 final View child = children[i]; 1114 child.dispatchCollectViewAttributes(attachInfo, 1115 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1116 } 1117 } 1118 } 1119 1120 /** 1121 * {@inheritDoc} 1122 */ 1123 public void bringChildToFront(View child) { 1124 int index = indexOfChild(child); 1125 if (index >= 0) { 1126 removeFromArray(index); 1127 addInArray(child, mChildrenCount); 1128 child.mParent = this; 1129 } 1130 } 1131 1132 private PointF getLocalPoint() { 1133 if (mLocalPoint == null) mLocalPoint = new PointF(); 1134 return mLocalPoint; 1135 } 1136 1137 /** 1138 * {@inheritDoc} 1139 */ 1140 // TODO: Write real docs 1141 @Override 1142 public boolean dispatchDragEvent(DragEvent event) { 1143 boolean retval = false; 1144 final float tx = event.mX; 1145 final float ty = event.mY; 1146 1147 ViewRootImpl root = getViewRootImpl(); 1148 1149 // Dispatch down the view hierarchy 1150 final PointF localPoint = getLocalPoint(); 1151 1152 switch (event.mAction) { 1153 case DragEvent.ACTION_DRAG_STARTED: { 1154 // clear state to recalculate which views we drag over 1155 mCurrentDragView = null; 1156 1157 // Set up our tracking of drag-started notifications 1158 mCurrentDrag = DragEvent.obtain(event); 1159 if (mDragNotifiedChildren == null) { 1160 mDragNotifiedChildren = new HashSet<View>(); 1161 } else { 1162 mDragNotifiedChildren.clear(); 1163 } 1164 1165 // Now dispatch down to our children, caching the responses 1166 mChildAcceptsDrag = false; 1167 final int count = mChildrenCount; 1168 final View[] children = mChildren; 1169 for (int i = 0; i < count; i++) { 1170 final View child = children[i]; 1171 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1172 if (child.getVisibility() == VISIBLE) { 1173 final boolean handled = notifyChildOfDrag(children[i]); 1174 if (handled) { 1175 mChildAcceptsDrag = true; 1176 } 1177 } 1178 } 1179 1180 // Return HANDLED if one of our children can accept the drag 1181 if (mChildAcceptsDrag) { 1182 retval = true; 1183 } 1184 } break; 1185 1186 case DragEvent.ACTION_DRAG_ENDED: { 1187 // Release the bookkeeping now that the drag lifecycle has ended 1188 if (mDragNotifiedChildren != null) { 1189 for (View child : mDragNotifiedChildren) { 1190 // If a child was notified about an ongoing drag, it's told that it's over 1191 child.dispatchDragEvent(event); 1192 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1193 child.refreshDrawableState(); 1194 } 1195 1196 mDragNotifiedChildren.clear(); 1197 if (mCurrentDrag != null) { 1198 mCurrentDrag.recycle(); 1199 mCurrentDrag = null; 1200 } 1201 } 1202 1203 // We consider drag-ended to have been handled if one of our children 1204 // had offered to handle the drag. 1205 if (mChildAcceptsDrag) { 1206 retval = true; 1207 } 1208 } break; 1209 1210 case DragEvent.ACTION_DRAG_LOCATION: { 1211 // Find the [possibly new] drag target 1212 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1213 1214 // If we've changed apparent drag target, tell the view root which view 1215 // we're over now [for purposes of the eventual drag-recipient-changed 1216 // notifications to the framework] and tell the new target that the drag 1217 // has entered its bounds. The root will see setDragFocus() calls all 1218 // the way down to the final leaf view that is handling the LOCATION event 1219 // before reporting the new potential recipient to the framework. 1220 if (mCurrentDragView != target) { 1221 root.setDragFocus(target); 1222 1223 final int action = event.mAction; 1224 // If we've dragged off of a child view, send it the EXITED message 1225 if (mCurrentDragView != null) { 1226 final View view = mCurrentDragView; 1227 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1228 view.dispatchDragEvent(event); 1229 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1230 view.refreshDrawableState(); 1231 } 1232 mCurrentDragView = target; 1233 1234 // If we've dragged over a new child view, send it the ENTERED message 1235 if (target != null) { 1236 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1237 target.dispatchDragEvent(event); 1238 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1239 target.refreshDrawableState(); 1240 } 1241 event.mAction = action; // restore the event's original state 1242 } 1243 1244 // Dispatch the actual drag location notice, localized into its coordinates 1245 if (target != null) { 1246 event.mX = localPoint.x; 1247 event.mY = localPoint.y; 1248 1249 retval = target.dispatchDragEvent(event); 1250 1251 event.mX = tx; 1252 event.mY = ty; 1253 } 1254 } break; 1255 1256 /* Entered / exited dispatch 1257 * 1258 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1259 * that we're about to get the corresponding LOCATION event, which we will use to 1260 * determine which of our children is the new target; at that point we will 1261 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1262 * 1263 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1264 * drag has left this ViewGroup, we know by definition that every contained subview 1265 * is also no longer under the drag point. 1266 */ 1267 1268 case DragEvent.ACTION_DRAG_EXITED: { 1269 if (mCurrentDragView != null) { 1270 final View view = mCurrentDragView; 1271 view.dispatchDragEvent(event); 1272 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1273 view.refreshDrawableState(); 1274 1275 mCurrentDragView = null; 1276 } 1277 } break; 1278 1279 case DragEvent.ACTION_DROP: { 1280 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1281 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1282 if (target != null) { 1283 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1284 event.mX = localPoint.x; 1285 event.mY = localPoint.y; 1286 retval = target.dispatchDragEvent(event); 1287 event.mX = tx; 1288 event.mY = ty; 1289 } else { 1290 if (ViewDebug.DEBUG_DRAG) { 1291 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1292 } 1293 } 1294 } break; 1295 } 1296 1297 // If none of our children could handle the event, try here 1298 if (!retval) { 1299 // Call up to the View implementation that dispatches to installed listeners 1300 retval = super.dispatchDragEvent(event); 1301 } 1302 return retval; 1303 } 1304 1305 // Find the frontmost child view that lies under the given point, and calculate 1306 // the position within its own local coordinate system. 1307 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1308 final int count = mChildrenCount; 1309 final View[] children = mChildren; 1310 for (int i = count - 1; i >= 0; i--) { 1311 final View child = children[i]; 1312 if (!child.canAcceptDrag()) { 1313 continue; 1314 } 1315 1316 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1317 return child; 1318 } 1319 } 1320 return null; 1321 } 1322 1323 boolean notifyChildOfDrag(View child) { 1324 if (ViewDebug.DEBUG_DRAG) { 1325 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1326 } 1327 1328 boolean canAccept = false; 1329 if (! mDragNotifiedChildren.contains(child)) { 1330 mDragNotifiedChildren.add(child); 1331 canAccept = child.dispatchDragEvent(mCurrentDrag); 1332 if (canAccept && !child.canAcceptDrag()) { 1333 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1334 child.refreshDrawableState(); 1335 } 1336 } 1337 return canAccept; 1338 } 1339 1340 @Override 1341 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1342 super.dispatchWindowSystemUiVisiblityChanged(visible); 1343 1344 final int count = mChildrenCount; 1345 final View[] children = mChildren; 1346 for (int i=0; i <count; i++) { 1347 final View child = children[i]; 1348 child.dispatchWindowSystemUiVisiblityChanged(visible); 1349 } 1350 } 1351 1352 @Override 1353 public void dispatchSystemUiVisibilityChanged(int visible) { 1354 super.dispatchSystemUiVisibilityChanged(visible); 1355 1356 final int count = mChildrenCount; 1357 final View[] children = mChildren; 1358 for (int i=0; i <count; i++) { 1359 final View child = children[i]; 1360 child.dispatchSystemUiVisibilityChanged(visible); 1361 } 1362 } 1363 1364 @Override 1365 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1366 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1367 1368 final int count = mChildrenCount; 1369 final View[] children = mChildren; 1370 for (int i=0; i <count; i++) { 1371 final View child = children[i]; 1372 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1373 } 1374 return changed; 1375 } 1376 1377 /** 1378 * {@inheritDoc} 1379 */ 1380 @Override 1381 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1382 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1383 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1384 return super.dispatchKeyEventPreIme(event); 1385 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1386 == PFLAG_HAS_BOUNDS) { 1387 return mFocused.dispatchKeyEventPreIme(event); 1388 } 1389 return false; 1390 } 1391 1392 /** 1393 * {@inheritDoc} 1394 */ 1395 @Override 1396 public boolean dispatchKeyEvent(KeyEvent event) { 1397 if (mInputEventConsistencyVerifier != null) { 1398 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1399 } 1400 1401 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1402 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1403 if (super.dispatchKeyEvent(event)) { 1404 return true; 1405 } 1406 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1407 == PFLAG_HAS_BOUNDS) { 1408 if (mFocused.dispatchKeyEvent(event)) { 1409 return true; 1410 } 1411 } 1412 1413 if (mInputEventConsistencyVerifier != null) { 1414 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1415 } 1416 return false; 1417 } 1418 1419 /** 1420 * {@inheritDoc} 1421 */ 1422 @Override 1423 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1424 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1425 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1426 return super.dispatchKeyShortcutEvent(event); 1427 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1428 == PFLAG_HAS_BOUNDS) { 1429 return mFocused.dispatchKeyShortcutEvent(event); 1430 } 1431 return false; 1432 } 1433 1434 /** 1435 * {@inheritDoc} 1436 */ 1437 @Override 1438 public boolean dispatchTrackballEvent(MotionEvent event) { 1439 if (mInputEventConsistencyVerifier != null) { 1440 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1441 } 1442 1443 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1444 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1445 if (super.dispatchTrackballEvent(event)) { 1446 return true; 1447 } 1448 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1449 == PFLAG_HAS_BOUNDS) { 1450 if (mFocused.dispatchTrackballEvent(event)) { 1451 return true; 1452 } 1453 } 1454 1455 if (mInputEventConsistencyVerifier != null) { 1456 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1457 } 1458 return false; 1459 } 1460 1461 /** 1462 * {@inheritDoc} 1463 */ 1464 @SuppressWarnings({"ConstantConditions"}) 1465 @Override 1466 protected boolean dispatchHoverEvent(MotionEvent event) { 1467 final int action = event.getAction(); 1468 1469 // First check whether the view group wants to intercept the hover event. 1470 final boolean interceptHover = onInterceptHoverEvent(event); 1471 event.setAction(action); // restore action in case it was changed 1472 1473 MotionEvent eventNoHistory = event; 1474 boolean handled = false; 1475 1476 // Send events to the hovered children and build a new list of hover targets until 1477 // one is found that handles the event. 1478 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1479 mFirstHoverTarget = null; 1480 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1481 final float x = event.getX(); 1482 final float y = event.getY(); 1483 final int childrenCount = mChildrenCount; 1484 if (childrenCount != 0) { 1485 final boolean customChildOrder = isChildrenDrawingOrderEnabled(); 1486 final View[] children = mChildren; 1487 HoverTarget lastHoverTarget = null; 1488 for (int i = childrenCount - 1; i >= 0; i--) { 1489 final int childIndex = customChildOrder 1490 ? getChildDrawingOrder(childrenCount, i) : i; 1491 final View child = children[childIndex]; 1492 if (!canViewReceivePointerEvents(child) 1493 || !isTransformedTouchPointInView(x, y, child, null)) { 1494 continue; 1495 } 1496 1497 // Obtain a hover target for this child. Dequeue it from the 1498 // old hover target list if the child was previously hovered. 1499 HoverTarget hoverTarget = firstOldHoverTarget; 1500 final boolean wasHovered; 1501 for (HoverTarget predecessor = null; ;) { 1502 if (hoverTarget == null) { 1503 hoverTarget = HoverTarget.obtain(child); 1504 wasHovered = false; 1505 break; 1506 } 1507 1508 if (hoverTarget.child == child) { 1509 if (predecessor != null) { 1510 predecessor.next = hoverTarget.next; 1511 } else { 1512 firstOldHoverTarget = hoverTarget.next; 1513 } 1514 hoverTarget.next = null; 1515 wasHovered = true; 1516 break; 1517 } 1518 1519 predecessor = hoverTarget; 1520 hoverTarget = hoverTarget.next; 1521 } 1522 1523 // Enqueue the hover target onto the new hover target list. 1524 if (lastHoverTarget != null) { 1525 lastHoverTarget.next = hoverTarget; 1526 } else { 1527 mFirstHoverTarget = hoverTarget; 1528 } 1529 lastHoverTarget = hoverTarget; 1530 1531 // Dispatch the event to the child. 1532 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1533 if (!wasHovered) { 1534 // Send the enter as is. 1535 handled |= dispatchTransformedGenericPointerEvent( 1536 event, child); // enter 1537 } 1538 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1539 if (!wasHovered) { 1540 // Synthesize an enter from a move. 1541 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1542 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1543 handled |= dispatchTransformedGenericPointerEvent( 1544 eventNoHistory, child); // enter 1545 eventNoHistory.setAction(action); 1546 1547 handled |= dispatchTransformedGenericPointerEvent( 1548 eventNoHistory, child); // move 1549 } else { 1550 // Send the move as is. 1551 handled |= dispatchTransformedGenericPointerEvent(event, child); 1552 } 1553 } 1554 if (handled) { 1555 break; 1556 } 1557 } 1558 } 1559 } 1560 1561 // Send exit events to all previously hovered children that are no longer hovered. 1562 while (firstOldHoverTarget != null) { 1563 final View child = firstOldHoverTarget.child; 1564 1565 // Exit the old hovered child. 1566 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1567 // Send the exit as is. 1568 handled |= dispatchTransformedGenericPointerEvent( 1569 event, child); // exit 1570 } else { 1571 // Synthesize an exit from a move or enter. 1572 // Ignore the result because hover focus has moved to a different view. 1573 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1574 dispatchTransformedGenericPointerEvent( 1575 event, child); // move 1576 } 1577 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1578 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1579 dispatchTransformedGenericPointerEvent( 1580 eventNoHistory, child); // exit 1581 eventNoHistory.setAction(action); 1582 } 1583 1584 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1585 firstOldHoverTarget.recycle(); 1586 firstOldHoverTarget = nextOldHoverTarget; 1587 } 1588 1589 // Send events to the view group itself if no children have handled it. 1590 boolean newHoveredSelf = !handled; 1591 if (newHoveredSelf == mHoveredSelf) { 1592 if (newHoveredSelf) { 1593 // Send event to the view group as before. 1594 handled |= super.dispatchHoverEvent(event); 1595 } 1596 } else { 1597 if (mHoveredSelf) { 1598 // Exit the view group. 1599 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1600 // Send the exit as is. 1601 handled |= super.dispatchHoverEvent(event); // exit 1602 } else { 1603 // Synthesize an exit from a move or enter. 1604 // Ignore the result because hover focus is moving to a different view. 1605 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1606 super.dispatchHoverEvent(event); // move 1607 } 1608 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1609 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1610 super.dispatchHoverEvent(eventNoHistory); // exit 1611 eventNoHistory.setAction(action); 1612 } 1613 mHoveredSelf = false; 1614 } 1615 1616 if (newHoveredSelf) { 1617 // Enter the view group. 1618 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1619 // Send the enter as is. 1620 handled |= super.dispatchHoverEvent(event); // enter 1621 mHoveredSelf = true; 1622 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1623 // Synthesize an enter from a move. 1624 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1625 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1626 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1627 eventNoHistory.setAction(action); 1628 1629 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1630 mHoveredSelf = true; 1631 } 1632 } 1633 } 1634 1635 // Recycle the copy of the event that we made. 1636 if (eventNoHistory != event) { 1637 eventNoHistory.recycle(); 1638 } 1639 1640 // Done. 1641 return handled; 1642 } 1643 1644 private void exitHoverTargets() { 1645 if (mHoveredSelf || mFirstHoverTarget != null) { 1646 final long now = SystemClock.uptimeMillis(); 1647 MotionEvent event = MotionEvent.obtain(now, now, 1648 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1649 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1650 dispatchHoverEvent(event); 1651 event.recycle(); 1652 } 1653 } 1654 1655 private void cancelHoverTarget(View view) { 1656 HoverTarget predecessor = null; 1657 HoverTarget target = mFirstHoverTarget; 1658 while (target != null) { 1659 final HoverTarget next = target.next; 1660 if (target.child == view) { 1661 if (predecessor == null) { 1662 mFirstHoverTarget = next; 1663 } else { 1664 predecessor.next = next; 1665 } 1666 target.recycle(); 1667 1668 final long now = SystemClock.uptimeMillis(); 1669 MotionEvent event = MotionEvent.obtain(now, now, 1670 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1671 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1672 view.dispatchHoverEvent(event); 1673 event.recycle(); 1674 return; 1675 } 1676 predecessor = target; 1677 target = next; 1678 } 1679 } 1680 1681 /** @hide */ 1682 @Override 1683 protected boolean hasHoveredChild() { 1684 return mFirstHoverTarget != null; 1685 } 1686 1687 @Override 1688 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1689 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1690 try { 1691 final int childrenCount = children.getChildCount(); 1692 for (int i = 0; i < childrenCount; i++) { 1693 View child = children.getChildAt(i); 1694 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1695 if (child.includeForAccessibility()) { 1696 childrenForAccessibility.add(child); 1697 } else { 1698 child.addChildrenForAccessibility(childrenForAccessibility); 1699 } 1700 } 1701 } 1702 } finally { 1703 children.recycle(); 1704 } 1705 } 1706 1707 /** 1708 * Implement this method to intercept hover events before they are handled 1709 * by child views. 1710 * <p> 1711 * This method is called before dispatching a hover event to a child of 1712 * the view group or to the view group's own {@link #onHoverEvent} to allow 1713 * the view group a chance to intercept the hover event. 1714 * This method can also be used to watch all pointer motions that occur within 1715 * the bounds of the view group even when the pointer is hovering over 1716 * a child of the view group rather than over the view group itself. 1717 * </p><p> 1718 * The view group can prevent its children from receiving hover events by 1719 * implementing this method and returning <code>true</code> to indicate 1720 * that it would like to intercept hover events. The view group must 1721 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1722 * for as long as it wishes to continue intercepting hover events from 1723 * its children. 1724 * </p><p> 1725 * Interception preserves the invariant that at most one view can be 1726 * hovered at a time by transferring hover focus from the currently hovered 1727 * child to the view group or vice-versa as needed. 1728 * </p><p> 1729 * If this method returns <code>true</code> and a child is already hovered, then the 1730 * child view will first receive a hover exit event and then the view group 1731 * itself will receive a hover enter event in {@link #onHoverEvent}. 1732 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1733 * events and instead returns <code>false</code> while the pointer is hovering 1734 * within the bounds of one of a child, then the view group will first receive a 1735 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1736 * receive a hover enter event. 1737 * </p><p> 1738 * The default implementation always returns false. 1739 * </p> 1740 * 1741 * @param event The motion event that describes the hover. 1742 * @return True if the view group would like to intercept the hover event 1743 * and prevent its children from receiving it. 1744 */ 1745 public boolean onInterceptHoverEvent(MotionEvent event) { 1746 return false; 1747 } 1748 1749 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1750 if (event.getHistorySize() == 0) { 1751 return event; 1752 } 1753 return MotionEvent.obtainNoHistory(event); 1754 } 1755 1756 /** 1757 * {@inheritDoc} 1758 */ 1759 @Override 1760 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1761 // Send the event to the child under the pointer. 1762 final int childrenCount = mChildrenCount; 1763 if (childrenCount != 0) { 1764 final View[] children = mChildren; 1765 final float x = event.getX(); 1766 final float y = event.getY(); 1767 1768 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1769 for (int i = childrenCount - 1; i >= 0; i--) { 1770 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1771 final View child = children[childIndex]; 1772 if (!canViewReceivePointerEvents(child) 1773 || !isTransformedTouchPointInView(x, y, child, null)) { 1774 continue; 1775 } 1776 1777 if (dispatchTransformedGenericPointerEvent(event, child)) { 1778 return true; 1779 } 1780 } 1781 } 1782 1783 // No child handled the event. Send it to this view group. 1784 return super.dispatchGenericPointerEvent(event); 1785 } 1786 1787 /** 1788 * {@inheritDoc} 1789 */ 1790 @Override 1791 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1792 // Send the event to the focused child or to this view group if it has focus. 1793 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1794 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1795 return super.dispatchGenericFocusedEvent(event); 1796 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1797 == PFLAG_HAS_BOUNDS) { 1798 return mFocused.dispatchGenericMotionEvent(event); 1799 } 1800 return false; 1801 } 1802 1803 /** 1804 * Dispatches a generic pointer event to a child, taking into account 1805 * transformations that apply to the child. 1806 * 1807 * @param event The event to send. 1808 * @param child The view to send the event to. 1809 * @return {@code true} if the child handled the event. 1810 */ 1811 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1812 final float offsetX = mScrollX - child.mLeft; 1813 final float offsetY = mScrollY - child.mTop; 1814 1815 boolean handled; 1816 if (!child.hasIdentityMatrix()) { 1817 MotionEvent transformedEvent = MotionEvent.obtain(event); 1818 transformedEvent.offsetLocation(offsetX, offsetY); 1819 transformedEvent.transform(child.getInverseMatrix()); 1820 handled = child.dispatchGenericMotionEvent(transformedEvent); 1821 transformedEvent.recycle(); 1822 } else { 1823 event.offsetLocation(offsetX, offsetY); 1824 handled = child.dispatchGenericMotionEvent(event); 1825 event.offsetLocation(-offsetX, -offsetY); 1826 } 1827 return handled; 1828 } 1829 1830 /** 1831 * {@inheritDoc} 1832 */ 1833 @Override 1834 public boolean dispatchTouchEvent(MotionEvent ev) { 1835 if (mInputEventConsistencyVerifier != null) { 1836 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1837 } 1838 1839 boolean handled = false; 1840 if (onFilterTouchEventForSecurity(ev)) { 1841 final int action = ev.getAction(); 1842 final int actionMasked = action & MotionEvent.ACTION_MASK; 1843 1844 // Handle an initial down. 1845 if (actionMasked == MotionEvent.ACTION_DOWN) { 1846 // Throw away all previous state when starting a new touch gesture. 1847 // The framework may have dropped the up or cancel event for the previous gesture 1848 // due to an app switch, ANR, or some other state change. 1849 cancelAndClearTouchTargets(ev); 1850 resetTouchState(); 1851 } 1852 1853 // Check for interception. 1854 final boolean intercepted; 1855 if (actionMasked == MotionEvent.ACTION_DOWN 1856 || mFirstTouchTarget != null) { 1857 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1858 if (!disallowIntercept) { 1859 intercepted = onInterceptTouchEvent(ev); 1860 ev.setAction(action); // restore action in case it was changed 1861 } else { 1862 intercepted = false; 1863 } 1864 } else { 1865 // There are no touch targets and this action is not an initial down 1866 // so this view group continues to intercept touches. 1867 intercepted = true; 1868 } 1869 1870 // Check for cancelation. 1871 final boolean canceled = resetCancelNextUpFlag(this) 1872 || actionMasked == MotionEvent.ACTION_CANCEL; 1873 1874 // Update list of touch targets for pointer down, if needed. 1875 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1876 TouchTarget newTouchTarget = null; 1877 boolean alreadyDispatchedToNewTouchTarget = false; 1878 if (!canceled && !intercepted) { 1879 if (actionMasked == MotionEvent.ACTION_DOWN 1880 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1881 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1882 final int actionIndex = ev.getActionIndex(); // always 0 for down 1883 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1884 : TouchTarget.ALL_POINTER_IDS; 1885 1886 // Clean up earlier touch targets for this pointer id in case they 1887 // have become out of sync. 1888 removePointersFromTouchTargets(idBitsToAssign); 1889 1890 final int childrenCount = mChildrenCount; 1891 if (newTouchTarget == null && childrenCount != 0) { 1892 final float x = ev.getX(actionIndex); 1893 final float y = ev.getY(actionIndex); 1894 // Find a child that can receive the event. 1895 // Scan children from front to back. 1896 final View[] children = mChildren; 1897 1898 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1899 for (int i = childrenCount - 1; i >= 0; i--) { 1900 final int childIndex = customOrder ? 1901 getChildDrawingOrder(childrenCount, i) : i; 1902 final View child = children[childIndex]; 1903 if (!canViewReceivePointerEvents(child) 1904 || !isTransformedTouchPointInView(x, y, child, null)) { 1905 continue; 1906 } 1907 1908 newTouchTarget = getTouchTarget(child); 1909 if (newTouchTarget != null) { 1910 // Child is already receiving touch within its bounds. 1911 // Give it the new pointer in addition to the ones it is handling. 1912 newTouchTarget.pointerIdBits |= idBitsToAssign; 1913 break; 1914 } 1915 1916 resetCancelNextUpFlag(child); 1917 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1918 // Child wants to receive touch within its bounds. 1919 mLastTouchDownTime = ev.getDownTime(); 1920 mLastTouchDownIndex = childIndex; 1921 mLastTouchDownX = ev.getX(); 1922 mLastTouchDownY = ev.getY(); 1923 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1924 alreadyDispatchedToNewTouchTarget = true; 1925 break; 1926 } 1927 } 1928 } 1929 1930 if (newTouchTarget == null && mFirstTouchTarget != null) { 1931 // Did not find a child to receive the event. 1932 // Assign the pointer to the least recently added target. 1933 newTouchTarget = mFirstTouchTarget; 1934 while (newTouchTarget.next != null) { 1935 newTouchTarget = newTouchTarget.next; 1936 } 1937 newTouchTarget.pointerIdBits |= idBitsToAssign; 1938 } 1939 } 1940 } 1941 1942 // Dispatch to touch targets. 1943 if (mFirstTouchTarget == null) { 1944 // No touch targets so treat this as an ordinary view. 1945 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1946 TouchTarget.ALL_POINTER_IDS); 1947 } else { 1948 // Dispatch to touch targets, excluding the new touch target if we already 1949 // dispatched to it. Cancel touch targets if necessary. 1950 TouchTarget predecessor = null; 1951 TouchTarget target = mFirstTouchTarget; 1952 while (target != null) { 1953 final TouchTarget next = target.next; 1954 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1955 handled = true; 1956 } else { 1957 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1958 || intercepted; 1959 if (dispatchTransformedTouchEvent(ev, cancelChild, 1960 target.child, target.pointerIdBits)) { 1961 handled = true; 1962 } 1963 if (cancelChild) { 1964 if (predecessor == null) { 1965 mFirstTouchTarget = next; 1966 } else { 1967 predecessor.next = next; 1968 } 1969 target.recycle(); 1970 target = next; 1971 continue; 1972 } 1973 } 1974 predecessor = target; 1975 target = next; 1976 } 1977 } 1978 1979 // Update list of touch targets for pointer up or cancel, if needed. 1980 if (canceled 1981 || actionMasked == MotionEvent.ACTION_UP 1982 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1983 resetTouchState(); 1984 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1985 final int actionIndex = ev.getActionIndex(); 1986 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1987 removePointersFromTouchTargets(idBitsToRemove); 1988 } 1989 } 1990 1991 if (!handled && mInputEventConsistencyVerifier != null) { 1992 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1993 } 1994 return handled; 1995 } 1996 1997 /** 1998 * Resets all touch state in preparation for a new cycle. 1999 */ 2000 private void resetTouchState() { 2001 clearTouchTargets(); 2002 resetCancelNextUpFlag(this); 2003 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2004 } 2005 2006 /** 2007 * Resets the cancel next up flag. 2008 * Returns true if the flag was previously set. 2009 */ 2010 private static boolean resetCancelNextUpFlag(View view) { 2011 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2012 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2013 return true; 2014 } 2015 return false; 2016 } 2017 2018 /** 2019 * Clears all touch targets. 2020 */ 2021 private void clearTouchTargets() { 2022 TouchTarget target = mFirstTouchTarget; 2023 if (target != null) { 2024 do { 2025 TouchTarget next = target.next; 2026 target.recycle(); 2027 target = next; 2028 } while (target != null); 2029 mFirstTouchTarget = null; 2030 } 2031 } 2032 2033 /** 2034 * Cancels and clears all touch targets. 2035 */ 2036 private void cancelAndClearTouchTargets(MotionEvent event) { 2037 if (mFirstTouchTarget != null) { 2038 boolean syntheticEvent = false; 2039 if (event == null) { 2040 final long now = SystemClock.uptimeMillis(); 2041 event = MotionEvent.obtain(now, now, 2042 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2043 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2044 syntheticEvent = true; 2045 } 2046 2047 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2048 resetCancelNextUpFlag(target.child); 2049 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2050 } 2051 clearTouchTargets(); 2052 2053 if (syntheticEvent) { 2054 event.recycle(); 2055 } 2056 } 2057 } 2058 2059 /** 2060 * Gets the touch target for specified child view. 2061 * Returns null if not found. 2062 */ 2063 private TouchTarget getTouchTarget(View child) { 2064 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2065 if (target.child == child) { 2066 return target; 2067 } 2068 } 2069 return null; 2070 } 2071 2072 /** 2073 * Adds a touch target for specified child to the beginning of the list. 2074 * Assumes the target child is not already present. 2075 */ 2076 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2077 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2078 target.next = mFirstTouchTarget; 2079 mFirstTouchTarget = target; 2080 return target; 2081 } 2082 2083 /** 2084 * Removes the pointer ids from consideration. 2085 */ 2086 private void removePointersFromTouchTargets(int pointerIdBits) { 2087 TouchTarget predecessor = null; 2088 TouchTarget target = mFirstTouchTarget; 2089 while (target != null) { 2090 final TouchTarget next = target.next; 2091 if ((target.pointerIdBits & pointerIdBits) != 0) { 2092 target.pointerIdBits &= ~pointerIdBits; 2093 if (target.pointerIdBits == 0) { 2094 if (predecessor == null) { 2095 mFirstTouchTarget = next; 2096 } else { 2097 predecessor.next = next; 2098 } 2099 target.recycle(); 2100 target = next; 2101 continue; 2102 } 2103 } 2104 predecessor = target; 2105 target = next; 2106 } 2107 } 2108 2109 private void cancelTouchTarget(View view) { 2110 TouchTarget predecessor = null; 2111 TouchTarget target = mFirstTouchTarget; 2112 while (target != null) { 2113 final TouchTarget next = target.next; 2114 if (target.child == view) { 2115 if (predecessor == null) { 2116 mFirstTouchTarget = next; 2117 } else { 2118 predecessor.next = next; 2119 } 2120 target.recycle(); 2121 2122 final long now = SystemClock.uptimeMillis(); 2123 MotionEvent event = MotionEvent.obtain(now, now, 2124 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2125 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2126 view.dispatchTouchEvent(event); 2127 event.recycle(); 2128 return; 2129 } 2130 predecessor = target; 2131 target = next; 2132 } 2133 } 2134 2135 /** 2136 * Returns true if a child view can receive pointer events. 2137 * @hide 2138 */ 2139 private static boolean canViewReceivePointerEvents(View child) { 2140 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2141 || child.getAnimation() != null; 2142 } 2143 2144 /** 2145 * Returns true if a child view contains the specified point when transformed 2146 * into its coordinate space. 2147 * Child must not be null. 2148 * @hide 2149 */ 2150 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2151 PointF outLocalPoint) { 2152 float localX = x + mScrollX - child.mLeft; 2153 float localY = y + mScrollY - child.mTop; 2154 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2155 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2156 localXY[0] = localX; 2157 localXY[1] = localY; 2158 child.getInverseMatrix().mapPoints(localXY); 2159 localX = localXY[0]; 2160 localY = localXY[1]; 2161 } 2162 final boolean isInView = child.pointInView(localX, localY); 2163 if (isInView && outLocalPoint != null) { 2164 outLocalPoint.set(localX, localY); 2165 } 2166 return isInView; 2167 } 2168 2169 /** 2170 * Transforms a motion event into the coordinate space of a particular child view, 2171 * filters out irrelevant pointer ids, and overrides its action if necessary. 2172 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2173 */ 2174 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2175 View child, int desiredPointerIdBits) { 2176 final boolean handled; 2177 2178 // Canceling motions is a special case. We don't need to perform any transformations 2179 // or filtering. The important part is the action, not the contents. 2180 final int oldAction = event.getAction(); 2181 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2182 event.setAction(MotionEvent.ACTION_CANCEL); 2183 if (child == null) { 2184 handled = super.dispatchTouchEvent(event); 2185 } else { 2186 handled = child.dispatchTouchEvent(event); 2187 } 2188 event.setAction(oldAction); 2189 return handled; 2190 } 2191 2192 // Calculate the number of pointers to deliver. 2193 final int oldPointerIdBits = event.getPointerIdBits(); 2194 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2195 2196 // If for some reason we ended up in an inconsistent state where it looks like we 2197 // might produce a motion event with no pointers in it, then drop the event. 2198 if (newPointerIdBits == 0) { 2199 return false; 2200 } 2201 2202 // If the number of pointers is the same and we don't need to perform any fancy 2203 // irreversible transformations, then we can reuse the motion event for this 2204 // dispatch as long as we are careful to revert any changes we make. 2205 // Otherwise we need to make a copy. 2206 final MotionEvent transformedEvent; 2207 if (newPointerIdBits == oldPointerIdBits) { 2208 if (child == null || child.hasIdentityMatrix()) { 2209 if (child == null) { 2210 handled = super.dispatchTouchEvent(event); 2211 } else { 2212 final float offsetX = mScrollX - child.mLeft; 2213 final float offsetY = mScrollY - child.mTop; 2214 event.offsetLocation(offsetX, offsetY); 2215 2216 handled = child.dispatchTouchEvent(event); 2217 2218 event.offsetLocation(-offsetX, -offsetY); 2219 } 2220 return handled; 2221 } 2222 transformedEvent = MotionEvent.obtain(event); 2223 } else { 2224 transformedEvent = event.split(newPointerIdBits); 2225 } 2226 2227 // Perform any necessary transformations and dispatch. 2228 if (child == null) { 2229 handled = super.dispatchTouchEvent(transformedEvent); 2230 } else { 2231 final float offsetX = mScrollX - child.mLeft; 2232 final float offsetY = mScrollY - child.mTop; 2233 transformedEvent.offsetLocation(offsetX, offsetY); 2234 if (! child.hasIdentityMatrix()) { 2235 transformedEvent.transform(child.getInverseMatrix()); 2236 } 2237 2238 handled = child.dispatchTouchEvent(transformedEvent); 2239 } 2240 2241 // Done. 2242 transformedEvent.recycle(); 2243 return handled; 2244 } 2245 2246 /** 2247 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2248 * dispatch. This behavior is enabled by default for applications that target an 2249 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2250 * 2251 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2252 * views depending on where each pointer initially went down. This allows for user interactions 2253 * such as scrolling two panes of content independently, chording of buttons, and performing 2254 * independent gestures on different pieces of content. 2255 * 2256 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2257 * child views. <code>false</code> to only allow one child view to be the target of 2258 * any MotionEvent received by this ViewGroup. 2259 */ 2260 public void setMotionEventSplittingEnabled(boolean split) { 2261 // TODO Applications really shouldn't change this setting mid-touch event, 2262 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2263 // with gestures in progress when this is changed. 2264 if (split) { 2265 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2266 } else { 2267 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2268 } 2269 } 2270 2271 /** 2272 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2273 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2274 */ 2275 public boolean isMotionEventSplittingEnabled() { 2276 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2277 } 2278 2279 /** 2280 * {@inheritDoc} 2281 */ 2282 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2283 2284 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2285 // We're already in this state, assume our ancestors are too 2286 return; 2287 } 2288 2289 if (disallowIntercept) { 2290 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2291 } else { 2292 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2293 } 2294 2295 // Pass it up to our parent 2296 if (mParent != null) { 2297 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2298 } 2299 } 2300 2301 /** 2302 * Implement this method to intercept all touch screen motion events. This 2303 * allows you to watch events as they are dispatched to your children, and 2304 * take ownership of the current gesture at any point. 2305 * 2306 * <p>Using this function takes some care, as it has a fairly complicated 2307 * interaction with {@link View#onTouchEvent(MotionEvent) 2308 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2309 * that method as well as this one in the correct way. Events will be 2310 * received in the following order: 2311 * 2312 * <ol> 2313 * <li> You will receive the down event here. 2314 * <li> The down event will be handled either by a child of this view 2315 * group, or given to your own onTouchEvent() method to handle; this means 2316 * you should implement onTouchEvent() to return true, so you will 2317 * continue to see the rest of the gesture (instead of looking for 2318 * a parent view to handle it). Also, by returning true from 2319 * onTouchEvent(), you will not receive any following 2320 * events in onInterceptTouchEvent() and all touch processing must 2321 * happen in onTouchEvent() like normal. 2322 * <li> For as long as you return false from this function, each following 2323 * event (up to and including the final up) will be delivered first here 2324 * and then to the target's onTouchEvent(). 2325 * <li> If you return true from here, you will not receive any 2326 * following events: the target view will receive the same event but 2327 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2328 * events will be delivered to your onTouchEvent() method and no longer 2329 * appear here. 2330 * </ol> 2331 * 2332 * @param ev The motion event being dispatched down the hierarchy. 2333 * @return Return true to steal motion events from the children and have 2334 * them dispatched to this ViewGroup through onTouchEvent(). 2335 * The current target will receive an ACTION_CANCEL event, and no further 2336 * messages will be delivered here. 2337 */ 2338 public boolean onInterceptTouchEvent(MotionEvent ev) { 2339 return false; 2340 } 2341 2342 /** 2343 * {@inheritDoc} 2344 * 2345 * Looks for a view to give focus to respecting the setting specified by 2346 * {@link #getDescendantFocusability()}. 2347 * 2348 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2349 * find focus within the children of this group when appropriate. 2350 * 2351 * @see #FOCUS_BEFORE_DESCENDANTS 2352 * @see #FOCUS_AFTER_DESCENDANTS 2353 * @see #FOCUS_BLOCK_DESCENDANTS 2354 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2355 */ 2356 @Override 2357 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2358 if (DBG) { 2359 System.out.println(this + " ViewGroup.requestFocus direction=" 2360 + direction); 2361 } 2362 int descendantFocusability = getDescendantFocusability(); 2363 2364 switch (descendantFocusability) { 2365 case FOCUS_BLOCK_DESCENDANTS: 2366 return super.requestFocus(direction, previouslyFocusedRect); 2367 case FOCUS_BEFORE_DESCENDANTS: { 2368 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2369 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2370 } 2371 case FOCUS_AFTER_DESCENDANTS: { 2372 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2373 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2374 } 2375 default: 2376 throw new IllegalStateException("descendant focusability must be " 2377 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2378 + "but is " + descendantFocusability); 2379 } 2380 } 2381 2382 /** 2383 * Look for a descendant to call {@link View#requestFocus} on. 2384 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2385 * when it wants to request focus within its children. Override this to 2386 * customize how your {@link ViewGroup} requests focus within its children. 2387 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2388 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2389 * to give a finer grained hint about where focus is coming from. May be null 2390 * if there is no hint. 2391 * @return Whether focus was taken. 2392 */ 2393 @SuppressWarnings({"ConstantConditions"}) 2394 protected boolean onRequestFocusInDescendants(int direction, 2395 Rect previouslyFocusedRect) { 2396 int index; 2397 int increment; 2398 int end; 2399 int count = mChildrenCount; 2400 if ((direction & FOCUS_FORWARD) != 0) { 2401 index = 0; 2402 increment = 1; 2403 end = count; 2404 } else { 2405 index = count - 1; 2406 increment = -1; 2407 end = -1; 2408 } 2409 final View[] children = mChildren; 2410 for (int i = index; i != end; i += increment) { 2411 View child = children[i]; 2412 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2413 if (child.requestFocus(direction, previouslyFocusedRect)) { 2414 return true; 2415 } 2416 } 2417 } 2418 return false; 2419 } 2420 2421 /** 2422 * {@inheritDoc} 2423 * 2424 * @hide 2425 */ 2426 @Override 2427 public void dispatchStartTemporaryDetach() { 2428 super.dispatchStartTemporaryDetach(); 2429 final int count = mChildrenCount; 2430 final View[] children = mChildren; 2431 for (int i = 0; i < count; i++) { 2432 children[i].dispatchStartTemporaryDetach(); 2433 } 2434 } 2435 2436 /** 2437 * {@inheritDoc} 2438 * 2439 * @hide 2440 */ 2441 @Override 2442 public void dispatchFinishTemporaryDetach() { 2443 super.dispatchFinishTemporaryDetach(); 2444 final int count = mChildrenCount; 2445 final View[] children = mChildren; 2446 for (int i = 0; i < count; i++) { 2447 children[i].dispatchFinishTemporaryDetach(); 2448 } 2449 } 2450 2451 /** 2452 * {@inheritDoc} 2453 */ 2454 @Override 2455 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2456 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2457 super.dispatchAttachedToWindow(info, visibility); 2458 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2459 2460 final int count = mChildrenCount; 2461 final View[] children = mChildren; 2462 for (int i = 0; i < count; i++) { 2463 final View child = children[i]; 2464 child.dispatchAttachedToWindow(info, 2465 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2466 } 2467 } 2468 2469 @Override 2470 void dispatchScreenStateChanged(int screenState) { 2471 super.dispatchScreenStateChanged(screenState); 2472 2473 final int count = mChildrenCount; 2474 final View[] children = mChildren; 2475 for (int i = 0; i < count; i++) { 2476 children[i].dispatchScreenStateChanged(screenState); 2477 } 2478 } 2479 2480 @Override 2481 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2482 boolean handled = false; 2483 if (includeForAccessibility()) { 2484 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2485 if (handled) { 2486 return handled; 2487 } 2488 } 2489 // Let our children have a shot in populating the event. 2490 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2491 try { 2492 final int childCount = children.getChildCount(); 2493 for (int i = 0; i < childCount; i++) { 2494 View child = children.getChildAt(i); 2495 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2496 handled = child.dispatchPopulateAccessibilityEvent(event); 2497 if (handled) { 2498 return handled; 2499 } 2500 } 2501 } 2502 } finally { 2503 children.recycle(); 2504 } 2505 return false; 2506 } 2507 2508 @Override 2509 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2510 super.onInitializeAccessibilityNodeInfoInternal(info); 2511 if (mAttachInfo != null) { 2512 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2513 childrenForAccessibility.clear(); 2514 addChildrenForAccessibility(childrenForAccessibility); 2515 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2516 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2517 View child = childrenForAccessibility.get(i); 2518 info.addChild(child); 2519 } 2520 childrenForAccessibility.clear(); 2521 } 2522 } 2523 2524 @Override 2525 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2526 super.onInitializeAccessibilityEventInternal(event); 2527 event.setClassName(ViewGroup.class.getName()); 2528 } 2529 2530 /** 2531 * @hide 2532 */ 2533 @Override 2534 public void childAccessibilityStateChanged(View root) { 2535 if (mParent != null) { 2536 mParent.childAccessibilityStateChanged(root); 2537 } 2538 } 2539 2540 @Override 2541 void resetSubtreeAccessibilityStateChanged() { 2542 super.resetSubtreeAccessibilityStateChanged(); 2543 View[] children = mChildren; 2544 final int childCount = mChildrenCount; 2545 for (int i = 0; i < childCount; i++) { 2546 children[i].resetSubtreeAccessibilityStateChanged(); 2547 } 2548 } 2549 2550 /** 2551 * {@inheritDoc} 2552 */ 2553 @Override 2554 void dispatchDetachedFromWindow() { 2555 // If we still have a touch target, we are still in the process of 2556 // dispatching motion events to a child; we need to get rid of that 2557 // child to avoid dispatching events to it after the window is torn 2558 // down. To make sure we keep the child in a consistent state, we 2559 // first send it an ACTION_CANCEL motion event. 2560 cancelAndClearTouchTargets(null); 2561 2562 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2563 exitHoverTargets(); 2564 2565 // In case view is detached while transition is running 2566 mLayoutCalledWhileSuppressed = false; 2567 2568 // Tear down our drag tracking 2569 mDragNotifiedChildren = null; 2570 if (mCurrentDrag != null) { 2571 mCurrentDrag.recycle(); 2572 mCurrentDrag = null; 2573 } 2574 2575 final int count = mChildrenCount; 2576 final View[] children = mChildren; 2577 for (int i = 0; i < count; i++) { 2578 children[i].dispatchDetachedFromWindow(); 2579 } 2580 super.dispatchDetachedFromWindow(); 2581 } 2582 2583 /** 2584 * @hide 2585 */ 2586 @Override 2587 protected void internalSetPadding(int left, int top, int right, int bottom) { 2588 super.internalSetPadding(left, top, right, bottom); 2589 2590 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2591 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2592 } else { 2593 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2594 } 2595 } 2596 2597 /** 2598 * {@inheritDoc} 2599 */ 2600 @Override 2601 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2602 super.dispatchSaveInstanceState(container); 2603 final int count = mChildrenCount; 2604 final View[] children = mChildren; 2605 for (int i = 0; i < count; i++) { 2606 View c = children[i]; 2607 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2608 c.dispatchSaveInstanceState(container); 2609 } 2610 } 2611 } 2612 2613 /** 2614 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2615 * to only this view, not to its children. For use when overriding 2616 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2617 * subclasses to freeze their own state but not the state of their children. 2618 * 2619 * @param container the container 2620 */ 2621 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2622 super.dispatchSaveInstanceState(container); 2623 } 2624 2625 /** 2626 * {@inheritDoc} 2627 */ 2628 @Override 2629 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2630 super.dispatchRestoreInstanceState(container); 2631 final int count = mChildrenCount; 2632 final View[] children = mChildren; 2633 for (int i = 0; i < count; i++) { 2634 View c = children[i]; 2635 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2636 c.dispatchRestoreInstanceState(container); 2637 } 2638 } 2639 } 2640 2641 /** 2642 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2643 * to only this view, not to its children. For use when overriding 2644 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2645 * subclasses to thaw their own state but not the state of their children. 2646 * 2647 * @param container the container 2648 */ 2649 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2650 super.dispatchRestoreInstanceState(container); 2651 } 2652 2653 /** 2654 * Enables or disables the drawing cache for each child of this view group. 2655 * 2656 * @param enabled true to enable the cache, false to dispose of it 2657 */ 2658 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2659 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2660 final View[] children = mChildren; 2661 final int count = mChildrenCount; 2662 for (int i = 0; i < count; i++) { 2663 children[i].setDrawingCacheEnabled(enabled); 2664 } 2665 } 2666 } 2667 2668 @Override 2669 protected void onAnimationStart() { 2670 super.onAnimationStart(); 2671 2672 // When this ViewGroup's animation starts, build the cache for the children 2673 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2674 final int count = mChildrenCount; 2675 final View[] children = mChildren; 2676 final boolean buildCache = !isHardwareAccelerated(); 2677 2678 for (int i = 0; i < count; i++) { 2679 final View child = children[i]; 2680 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2681 child.setDrawingCacheEnabled(true); 2682 if (buildCache) { 2683 child.buildDrawingCache(true); 2684 } 2685 } 2686 } 2687 2688 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2689 } 2690 } 2691 2692 @Override 2693 protected void onAnimationEnd() { 2694 super.onAnimationEnd(); 2695 2696 // When this ViewGroup's animation ends, destroy the cache of the children 2697 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2698 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2699 2700 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2701 setChildrenDrawingCacheEnabled(false); 2702 } 2703 } 2704 } 2705 2706 @Override 2707 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2708 int count = mChildrenCount; 2709 int[] visibilities = null; 2710 2711 if (skipChildren) { 2712 visibilities = new int[count]; 2713 for (int i = 0; i < count; i++) { 2714 View child = getChildAt(i); 2715 visibilities[i] = child.getVisibility(); 2716 if (visibilities[i] == View.VISIBLE) { 2717 child.setVisibility(INVISIBLE); 2718 } 2719 } 2720 } 2721 2722 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2723 2724 if (skipChildren) { 2725 for (int i = 0; i < count; i++) { 2726 getChildAt(i).setVisibility(visibilities[i]); 2727 } 2728 } 2729 2730 return b; 2731 } 2732 2733 /** Return true if this ViewGroup is laying out using optical bounds. */ 2734 boolean isLayoutModeOptical() { 2735 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2736 } 2737 2738 Insets computeOpticalInsets() { 2739 if (isLayoutModeOptical()) { 2740 int left = 0; 2741 int top = 0; 2742 int right = 0; 2743 int bottom = 0; 2744 for (int i = 0; i < mChildrenCount; i++) { 2745 View child = getChildAt(i); 2746 if (child.getVisibility() == VISIBLE) { 2747 Insets insets = child.getOpticalInsets(); 2748 left = Math.max(left, insets.left); 2749 top = Math.max(top, insets.top); 2750 right = Math.max(right, insets.right); 2751 bottom = Math.max(bottom, insets.bottom); 2752 } 2753 } 2754 return Insets.of(left, top, right, bottom); 2755 } else { 2756 return Insets.NONE; 2757 } 2758 } 2759 2760 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2761 if (x1 != x2 && y1 != y2) { 2762 if (x1 > x2) { 2763 int tmp = x1; x1 = x2; x2 = tmp; 2764 } 2765 if (y1 > y2) { 2766 int tmp = y1; y1 = y2; y2 = tmp; 2767 } 2768 canvas.drawRect(x1, y1, x2, y2, paint); 2769 } 2770 } 2771 2772 private static int sign(int x) { 2773 return (x >= 0) ? 1 : -1; 2774 } 2775 2776 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2777 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2778 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2779 } 2780 2781 private int dipsToPixels(int dips) { 2782 float scale = getContext().getResources().getDisplayMetrics().density; 2783 return (int) (dips * scale + 0.5f); 2784 } 2785 2786 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2787 int lineLength, int lineWidth) { 2788 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2789 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2790 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2791 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2792 } 2793 2794 private static void fillDifference(Canvas canvas, 2795 int x2, int y2, int x3, int y3, 2796 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2797 int x1 = x2 - dx1; 2798 int y1 = y2 - dy1; 2799 2800 int x4 = x3 + dx2; 2801 int y4 = y3 + dy2; 2802 2803 fillRect(canvas, paint, x1, y1, x4, y2); 2804 fillRect(canvas, paint, x1, y2, x2, y3); 2805 fillRect(canvas, paint, x3, y2, x4, y3); 2806 fillRect(canvas, paint, x1, y3, x4, y4); 2807 } 2808 2809 /** 2810 * @hide 2811 */ 2812 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2813 for (int i = 0; i < getChildCount(); i++) { 2814 View c = getChildAt(i); 2815 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2816 } 2817 } 2818 2819 /** 2820 * @hide 2821 */ 2822 protected void onDebugDraw(Canvas canvas) { 2823 Paint paint = getDebugPaint(); 2824 2825 // Draw optical bounds 2826 { 2827 paint.setColor(Color.RED); 2828 paint.setStyle(Paint.Style.STROKE); 2829 2830 for (int i = 0; i < getChildCount(); i++) { 2831 View c = getChildAt(i); 2832 Insets insets = c.getOpticalInsets(); 2833 2834 drawRect(canvas, paint, 2835 c.getLeft() + insets.left, 2836 c.getTop() + insets.top, 2837 c.getRight() - insets.right - 1, 2838 c.getBottom() - insets.bottom - 1); 2839 } 2840 } 2841 2842 // Draw margins 2843 { 2844 paint.setColor(Color.argb(63, 255, 0, 255)); 2845 paint.setStyle(Paint.Style.FILL); 2846 2847 onDebugDrawMargins(canvas, paint); 2848 } 2849 2850 // Draw clip bounds 2851 { 2852 paint.setColor(Color.rgb(63, 127, 255)); 2853 paint.setStyle(Paint.Style.FILL); 2854 2855 int lineLength = dipsToPixels(8); 2856 int lineWidth = dipsToPixels(1); 2857 for (int i = 0; i < getChildCount(); i++) { 2858 View c = getChildAt(i); 2859 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2860 paint, lineLength, lineWidth); 2861 } 2862 } 2863 } 2864 2865 /** 2866 * {@inheritDoc} 2867 */ 2868 @Override 2869 protected void dispatchDraw(Canvas canvas) { 2870 final int count = mChildrenCount; 2871 final View[] children = mChildren; 2872 int flags = mGroupFlags; 2873 2874 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2875 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2876 2877 final boolean buildCache = !isHardwareAccelerated(); 2878 for (int i = 0; i < count; i++) { 2879 final View child = children[i]; 2880 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2881 final LayoutParams params = child.getLayoutParams(); 2882 attachLayoutAnimationParameters(child, params, i, count); 2883 bindLayoutAnimation(child); 2884 if (cache) { 2885 child.setDrawingCacheEnabled(true); 2886 if (buildCache) { 2887 child.buildDrawingCache(true); 2888 } 2889 } 2890 } 2891 } 2892 2893 final LayoutAnimationController controller = mLayoutAnimationController; 2894 if (controller.willOverlap()) { 2895 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2896 } 2897 2898 controller.start(); 2899 2900 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2901 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2902 2903 if (cache) { 2904 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2905 } 2906 2907 if (mAnimationListener != null) { 2908 mAnimationListener.onAnimationStart(controller.getAnimation()); 2909 } 2910 } 2911 2912 int saveCount = 0; 2913 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2914 if (clipToPadding) { 2915 saveCount = canvas.save(); 2916 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2917 mScrollX + mRight - mLeft - mPaddingRight, 2918 mScrollY + mBottom - mTop - mPaddingBottom); 2919 2920 } 2921 2922 // We will draw our child's animation, let's reset the flag 2923 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2924 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2925 2926 boolean more = false; 2927 final long drawingTime = getDrawingTime(); 2928 2929 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2930 for (int i = 0; i < count; i++) { 2931 final View child = children[i]; 2932 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2933 more |= drawChild(canvas, child, drawingTime); 2934 } 2935 } 2936 } else { 2937 for (int i = 0; i < count; i++) { 2938 final View child = children[getChildDrawingOrder(count, i)]; 2939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2940 more |= drawChild(canvas, child, drawingTime); 2941 } 2942 } 2943 } 2944 2945 // Draw any disappearing views that have animations 2946 if (mDisappearingChildren != null) { 2947 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2948 final int disappearingCount = disappearingChildren.size() - 1; 2949 // Go backwards -- we may delete as animations finish 2950 for (int i = disappearingCount; i >= 0; i--) { 2951 final View child = disappearingChildren.get(i); 2952 more |= drawChild(canvas, child, drawingTime); 2953 } 2954 } 2955 2956 if (debugDraw()) { 2957 onDebugDraw(canvas); 2958 } 2959 2960 if (clipToPadding) { 2961 canvas.restoreToCount(saveCount); 2962 } 2963 2964 // mGroupFlags might have been updated by drawChild() 2965 flags = mGroupFlags; 2966 2967 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2968 invalidate(true); 2969 } 2970 2971 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2972 mLayoutAnimationController.isDone() && !more) { 2973 // We want to erase the drawing cache and notify the listener after the 2974 // next frame is drawn because one extra invalidate() is caused by 2975 // drawChild() after the animation is over 2976 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2977 final Runnable end = new Runnable() { 2978 public void run() { 2979 notifyAnimationListener(); 2980 } 2981 }; 2982 post(end); 2983 } 2984 } 2985 2986 /** 2987 * Returns the ViewGroupOverlay for this view group, creating it if it does 2988 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 2989 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 2990 * views, like overlay drawables, are visual-only; they do not receive input 2991 * events and should not be used as anything other than a temporary 2992 * representation of a view in a parent container, such as might be used 2993 * by an animation effect. 2994 * 2995 * <p>Note: Overlays do not currently work correctly with {@link 2996 * SurfaceView} or {@link TextureView}; contents in overlays for these 2997 * types of views may not display correctly.</p> 2998 * 2999 * @return The ViewGroupOverlay object for this view. 3000 * @see ViewGroupOverlay 3001 */ 3002 @Override 3003 public ViewGroupOverlay getOverlay() { 3004 if (mOverlay == null) { 3005 mOverlay = new ViewGroupOverlay(mContext, this); 3006 } 3007 return (ViewGroupOverlay) mOverlay; 3008 } 3009 3010 /** 3011 * Returns the index of the child to draw for this iteration. Override this 3012 * if you want to change the drawing order of children. By default, it 3013 * returns i. 3014 * <p> 3015 * NOTE: In order for this method to be called, you must enable child ordering 3016 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3017 * 3018 * @param i The current iteration. 3019 * @return The index of the child to draw this iteration. 3020 * 3021 * @see #setChildrenDrawingOrderEnabled(boolean) 3022 * @see #isChildrenDrawingOrderEnabled() 3023 */ 3024 protected int getChildDrawingOrder(int childCount, int i) { 3025 return i; 3026 } 3027 3028 private void notifyAnimationListener() { 3029 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3030 mGroupFlags |= FLAG_ANIMATION_DONE; 3031 3032 if (mAnimationListener != null) { 3033 final Runnable end = new Runnable() { 3034 public void run() { 3035 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3036 } 3037 }; 3038 post(end); 3039 } 3040 3041 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3042 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3043 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3044 setChildrenDrawingCacheEnabled(false); 3045 } 3046 } 3047 3048 invalidate(true); 3049 } 3050 3051 /** 3052 * This method is used to cause children of this ViewGroup to restore or recreate their 3053 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3054 * to recreate its own display list, which would happen if it went through the normal 3055 * draw/dispatchDraw mechanisms. 3056 * 3057 * @hide 3058 */ 3059 @Override 3060 protected void dispatchGetDisplayList() { 3061 final int count = mChildrenCount; 3062 final View[] children = mChildren; 3063 for (int i = 0; i < count; i++) { 3064 final View child = children[i]; 3065 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3066 child.hasStaticLayer()) { 3067 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3068 == PFLAG_INVALIDATED; 3069 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3070 child.getDisplayList(); 3071 child.mRecreateDisplayList = false; 3072 } 3073 } 3074 if (mOverlay != null) { 3075 View overlayView = mOverlay.getOverlayView(); 3076 overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) 3077 == PFLAG_INVALIDATED; 3078 overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; 3079 overlayView.getDisplayList(); 3080 overlayView.mRecreateDisplayList = false; 3081 } 3082 } 3083 3084 /** 3085 * Draw one child of this View Group. This method is responsible for getting 3086 * the canvas in the right state. This includes clipping, translating so 3087 * that the child's scrolled origin is at 0, 0, and applying any animation 3088 * transformations. 3089 * 3090 * @param canvas The canvas on which to draw the child 3091 * @param child Who to draw 3092 * @param drawingTime The time at which draw is occurring 3093 * @return True if an invalidate() was issued 3094 */ 3095 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3096 return child.draw(canvas, this, drawingTime); 3097 } 3098 3099 /** 3100 * Returns whether ths group's children are clipped to their bounds before drawing. 3101 * The default value is true. 3102 * @see #setClipChildren(boolean) 3103 * 3104 * @return True if the group's children will be clipped to their bounds, 3105 * false otherwise. 3106 */ 3107 public boolean getClipChildren() { 3108 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3109 } 3110 3111 /** 3112 * By default, children are clipped to their bounds before drawing. This 3113 * allows view groups to override this behavior for animations, etc. 3114 * 3115 * @param clipChildren true to clip children to their bounds, 3116 * false otherwise 3117 * @attr ref android.R.styleable#ViewGroup_clipChildren 3118 */ 3119 public void setClipChildren(boolean clipChildren) { 3120 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3121 if (clipChildren != previousValue) { 3122 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3123 for (int i = 0; i < mChildrenCount; ++i) { 3124 View child = getChildAt(i); 3125 if (child.mDisplayList != null) { 3126 child.mDisplayList.setClipToBounds(clipChildren); 3127 } 3128 } 3129 } 3130 } 3131 3132 /** 3133 * By default, children are clipped to the padding of the ViewGroup. This 3134 * allows view groups to override this behavior 3135 * 3136 * @param clipToPadding true to clip children to the padding of the 3137 * group, false otherwise 3138 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3139 */ 3140 public void setClipToPadding(boolean clipToPadding) { 3141 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3142 } 3143 3144 /** 3145 * {@inheritDoc} 3146 */ 3147 @Override 3148 public void dispatchSetSelected(boolean selected) { 3149 final View[] children = mChildren; 3150 final int count = mChildrenCount; 3151 for (int i = 0; i < count; i++) { 3152 children[i].setSelected(selected); 3153 } 3154 } 3155 3156 /** 3157 * {@inheritDoc} 3158 */ 3159 @Override 3160 public void dispatchSetActivated(boolean activated) { 3161 final View[] children = mChildren; 3162 final int count = mChildrenCount; 3163 for (int i = 0; i < count; i++) { 3164 children[i].setActivated(activated); 3165 } 3166 } 3167 3168 @Override 3169 protected void dispatchSetPressed(boolean pressed) { 3170 final View[] children = mChildren; 3171 final int count = mChildrenCount; 3172 for (int i = 0; i < count; i++) { 3173 final View child = children[i]; 3174 // Children that are clickable on their own should not 3175 // show a pressed state when their parent view does. 3176 // Clearing a pressed state always propagates. 3177 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3178 child.setPressed(pressed); 3179 } 3180 } 3181 } 3182 3183 /** 3184 * When this property is set to true, this ViewGroup supports static transformations on 3185 * children; this causes 3186 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3187 * invoked when a child is drawn. 3188 * 3189 * Any subclass overriding 3190 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3191 * set this property to true. 3192 * 3193 * @param enabled True to enable static transformations on children, false otherwise. 3194 * 3195 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3196 */ 3197 protected void setStaticTransformationsEnabled(boolean enabled) { 3198 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3199 } 3200 3201 /** 3202 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3203 * boolean to indicate whether a static transform was set. The default implementation 3204 * simply returns <code>false</code>; subclasses may override this method for different 3205 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3206 * for this method to be called. 3207 * 3208 * @param child The child view whose static transform is being requested 3209 * @param t The Transformation which will hold the result 3210 * @return true if the transformation was set, false otherwise 3211 * @see #setStaticTransformationsEnabled(boolean) 3212 */ 3213 protected boolean getChildStaticTransformation(View child, Transformation t) { 3214 return false; 3215 } 3216 3217 Transformation getChildTransformation() { 3218 if (mChildTransformation == null) { 3219 mChildTransformation = new Transformation(); 3220 } 3221 return mChildTransformation; 3222 } 3223 3224 /** 3225 * {@hide} 3226 */ 3227 @Override 3228 protected View findViewTraversal(int id) { 3229 if (id == mID) { 3230 return this; 3231 } 3232 3233 final View[] where = mChildren; 3234 final int len = mChildrenCount; 3235 3236 for (int i = 0; i < len; i++) { 3237 View v = where[i]; 3238 3239 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3240 v = v.findViewById(id); 3241 3242 if (v != null) { 3243 return v; 3244 } 3245 } 3246 } 3247 3248 return null; 3249 } 3250 3251 /** 3252 * {@hide} 3253 */ 3254 @Override 3255 protected View findViewWithTagTraversal(Object tag) { 3256 if (tag != null && tag.equals(mTag)) { 3257 return this; 3258 } 3259 3260 final View[] where = mChildren; 3261 final int len = mChildrenCount; 3262 3263 for (int i = 0; i < len; i++) { 3264 View v = where[i]; 3265 3266 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3267 v = v.findViewWithTag(tag); 3268 3269 if (v != null) { 3270 return v; 3271 } 3272 } 3273 } 3274 3275 return null; 3276 } 3277 3278 /** 3279 * {@hide} 3280 */ 3281 @Override 3282 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3283 if (predicate.apply(this)) { 3284 return this; 3285 } 3286 3287 final View[] where = mChildren; 3288 final int len = mChildrenCount; 3289 3290 for (int i = 0; i < len; i++) { 3291 View v = where[i]; 3292 3293 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3294 v = v.findViewByPredicate(predicate); 3295 3296 if (v != null) { 3297 return v; 3298 } 3299 } 3300 } 3301 3302 return null; 3303 } 3304 3305 /** 3306 * <p>Adds a child view. If no layout parameters are already set on the child, the 3307 * default parameters for this ViewGroup are set on the child.</p> 3308 * 3309 * <p><strong>Note:</strong> do not invoke this method from 3310 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3311 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3312 * 3313 * @param child the child view to add 3314 * 3315 * @see #generateDefaultLayoutParams() 3316 */ 3317 public void addView(View child) { 3318 addView(child, -1); 3319 } 3320 3321 /** 3322 * Adds a child view. If no layout parameters are already set on the child, the 3323 * default parameters for this ViewGroup are set on the child. 3324 * 3325 * <p><strong>Note:</strong> do not invoke this method from 3326 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3327 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3328 * 3329 * @param child the child view to add 3330 * @param index the position at which to add the child 3331 * 3332 * @see #generateDefaultLayoutParams() 3333 */ 3334 public void addView(View child, int index) { 3335 LayoutParams params = child.getLayoutParams(); 3336 if (params == null) { 3337 params = generateDefaultLayoutParams(); 3338 if (params == null) { 3339 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3340 } 3341 } 3342 addView(child, index, params); 3343 } 3344 3345 /** 3346 * Adds a child view with this ViewGroup's default layout parameters and the 3347 * specified width and height. 3348 * 3349 * <p><strong>Note:</strong> do not invoke this method from 3350 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3351 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3352 * 3353 * @param child the child view to add 3354 */ 3355 public void addView(View child, int width, int height) { 3356 final LayoutParams params = generateDefaultLayoutParams(); 3357 params.width = width; 3358 params.height = height; 3359 addView(child, -1, params); 3360 } 3361 3362 /** 3363 * Adds a child view with the specified layout parameters. 3364 * 3365 * <p><strong>Note:</strong> do not invoke this method from 3366 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3367 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3368 * 3369 * @param child the child view to add 3370 * @param params the layout parameters to set on the child 3371 */ 3372 public void addView(View child, LayoutParams params) { 3373 addView(child, -1, params); 3374 } 3375 3376 /** 3377 * Adds a child view with the specified layout parameters. 3378 * 3379 * <p><strong>Note:</strong> do not invoke this method from 3380 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3381 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3382 * 3383 * @param child the child view to add 3384 * @param index the position at which to add the child 3385 * @param params the layout parameters to set on the child 3386 */ 3387 public void addView(View child, int index, LayoutParams params) { 3388 if (DBG) { 3389 System.out.println(this + " addView"); 3390 } 3391 3392 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3393 // therefore, we call requestLayout() on ourselves before, so that the child's request 3394 // will be blocked at our level 3395 requestLayout(); 3396 invalidate(true); 3397 addViewInner(child, index, params, false); 3398 } 3399 3400 /** 3401 * {@inheritDoc} 3402 */ 3403 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3404 if (!checkLayoutParams(params)) { 3405 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3406 } 3407 if (view.mParent != this) { 3408 throw new IllegalArgumentException("Given view not a child of " + this); 3409 } 3410 view.setLayoutParams(params); 3411 } 3412 3413 /** 3414 * {@inheritDoc} 3415 */ 3416 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3417 return p != null; 3418 } 3419 3420 /** 3421 * Interface definition for a callback to be invoked when the hierarchy 3422 * within this view changed. The hierarchy changes whenever a child is added 3423 * to or removed from this view. 3424 */ 3425 public interface OnHierarchyChangeListener { 3426 /** 3427 * Called when a new child is added to a parent view. 3428 * 3429 * @param parent the view in which a child was added 3430 * @param child the new child view added in the hierarchy 3431 */ 3432 void onChildViewAdded(View parent, View child); 3433 3434 /** 3435 * Called when a child is removed from a parent view. 3436 * 3437 * @param parent the view from which the child was removed 3438 * @param child the child removed from the hierarchy 3439 */ 3440 void onChildViewRemoved(View parent, View child); 3441 } 3442 3443 /** 3444 * Register a callback to be invoked when a child is added to or removed 3445 * from this view. 3446 * 3447 * @param listener the callback to invoke on hierarchy change 3448 */ 3449 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3450 mOnHierarchyChangeListener = listener; 3451 } 3452 3453 /** 3454 * @hide 3455 */ 3456 protected void onViewAdded(View child) { 3457 if (mOnHierarchyChangeListener != null) { 3458 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3459 } 3460 } 3461 3462 /** 3463 * @hide 3464 */ 3465 protected void onViewRemoved(View child) { 3466 if (mOnHierarchyChangeListener != null) { 3467 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3468 } 3469 } 3470 3471 private void clearCachedLayoutMode() { 3472 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3473 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3474 } 3475 } 3476 3477 @Override 3478 protected void onAttachedToWindow() { 3479 super.onAttachedToWindow(); 3480 clearCachedLayoutMode(); 3481 } 3482 3483 @Override 3484 protected void onDetachedFromWindow() { 3485 super.onDetachedFromWindow(); 3486 clearCachedLayoutMode(); 3487 } 3488 3489 /** 3490 * Adds a view during layout. This is useful if in your onLayout() method, 3491 * you need to add more views (as does the list view for example). 3492 * 3493 * If index is negative, it means put it at the end of the list. 3494 * 3495 * @param child the view to add to the group 3496 * @param index the index at which the child must be added 3497 * @param params the layout parameters to associate with the child 3498 * @return true if the child was added, false otherwise 3499 */ 3500 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3501 return addViewInLayout(child, index, params, false); 3502 } 3503 3504 /** 3505 * Adds a view during layout. This is useful if in your onLayout() method, 3506 * you need to add more views (as does the list view for example). 3507 * 3508 * If index is negative, it means put it at the end of the list. 3509 * 3510 * @param child the view to add to the group 3511 * @param index the index at which the child must be added 3512 * @param params the layout parameters to associate with the child 3513 * @param preventRequestLayout if true, calling this method will not trigger a 3514 * layout request on child 3515 * @return true if the child was added, false otherwise 3516 */ 3517 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3518 boolean preventRequestLayout) { 3519 child.mParent = null; 3520 addViewInner(child, index, params, preventRequestLayout); 3521 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3522 return true; 3523 } 3524 3525 /** 3526 * Prevents the specified child to be laid out during the next layout pass. 3527 * 3528 * @param child the child on which to perform the cleanup 3529 */ 3530 protected void cleanupLayoutState(View child) { 3531 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3532 } 3533 3534 private void addViewInner(View child, int index, LayoutParams params, 3535 boolean preventRequestLayout) { 3536 3537 if (mTransition != null) { 3538 // Don't prevent other add transitions from completing, but cancel remove 3539 // transitions to let them complete the process before we add to the container 3540 mTransition.cancel(LayoutTransition.DISAPPEARING); 3541 } 3542 3543 if (child.getParent() != null) { 3544 throw new IllegalStateException("The specified child already has a parent. " + 3545 "You must call removeView() on the child's parent first."); 3546 } 3547 3548 if (mTransition != null) { 3549 mTransition.addChild(this, child); 3550 } 3551 3552 if (!checkLayoutParams(params)) { 3553 params = generateLayoutParams(params); 3554 } 3555 3556 if (preventRequestLayout) { 3557 child.mLayoutParams = params; 3558 } else { 3559 child.setLayoutParams(params); 3560 } 3561 3562 if (index < 0) { 3563 index = mChildrenCount; 3564 } 3565 3566 addInArray(child, index); 3567 3568 // tell our children 3569 if (preventRequestLayout) { 3570 child.assignParent(this); 3571 } else { 3572 child.mParent = this; 3573 } 3574 3575 if (child.hasFocus()) { 3576 requestChildFocus(child, child.findFocus()); 3577 } 3578 3579 AttachInfo ai = mAttachInfo; 3580 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3581 boolean lastKeepOn = ai.mKeepScreenOn; 3582 ai.mKeepScreenOn = false; 3583 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3584 if (ai.mKeepScreenOn) { 3585 needGlobalAttributesUpdate(true); 3586 } 3587 ai.mKeepScreenOn = lastKeepOn; 3588 } 3589 3590 if (child.isLayoutDirectionInherited()) { 3591 child.resetRtlProperties(); 3592 } 3593 3594 onViewAdded(child); 3595 3596 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3597 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3598 } 3599 3600 if (child.hasTransientState()) { 3601 childHasTransientStateChanged(child, true); 3602 } 3603 3604 if (child.isImportantForAccessibility() && child.getVisibility() != View.GONE) { 3605 notifySubtreeAccessibilityStateChangedIfNeeded(); 3606 } 3607 } 3608 3609 private void addInArray(View child, int index) { 3610 View[] children = mChildren; 3611 final int count = mChildrenCount; 3612 final int size = children.length; 3613 if (index == count) { 3614 if (size == count) { 3615 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3616 System.arraycopy(children, 0, mChildren, 0, size); 3617 children = mChildren; 3618 } 3619 children[mChildrenCount++] = child; 3620 } else if (index < count) { 3621 if (size == count) { 3622 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3623 System.arraycopy(children, 0, mChildren, 0, index); 3624 System.arraycopy(children, index, mChildren, index + 1, count - index); 3625 children = mChildren; 3626 } else { 3627 System.arraycopy(children, index, children, index + 1, count - index); 3628 } 3629 children[index] = child; 3630 mChildrenCount++; 3631 if (mLastTouchDownIndex >= index) { 3632 mLastTouchDownIndex++; 3633 } 3634 } else { 3635 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3636 } 3637 } 3638 3639 // This method also sets the child's mParent to null 3640 private void removeFromArray(int index) { 3641 final View[] children = mChildren; 3642 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3643 children[index].mParent = null; 3644 } 3645 final int count = mChildrenCount; 3646 if (index == count - 1) { 3647 children[--mChildrenCount] = null; 3648 } else if (index >= 0 && index < count) { 3649 System.arraycopy(children, index + 1, children, index, count - index - 1); 3650 children[--mChildrenCount] = null; 3651 } else { 3652 throw new IndexOutOfBoundsException(); 3653 } 3654 if (mLastTouchDownIndex == index) { 3655 mLastTouchDownTime = 0; 3656 mLastTouchDownIndex = -1; 3657 } else if (mLastTouchDownIndex > index) { 3658 mLastTouchDownIndex--; 3659 } 3660 } 3661 3662 // This method also sets the children's mParent to null 3663 private void removeFromArray(int start, int count) { 3664 final View[] children = mChildren; 3665 final int childrenCount = mChildrenCount; 3666 3667 start = Math.max(0, start); 3668 final int end = Math.min(childrenCount, start + count); 3669 3670 if (start == end) { 3671 return; 3672 } 3673 3674 if (end == childrenCount) { 3675 for (int i = start; i < end; i++) { 3676 children[i].mParent = null; 3677 children[i] = null; 3678 } 3679 } else { 3680 for (int i = start; i < end; i++) { 3681 children[i].mParent = null; 3682 } 3683 3684 // Since we're looping above, we might as well do the copy, but is arraycopy() 3685 // faster than the extra 2 bounds checks we would do in the loop? 3686 System.arraycopy(children, end, children, start, childrenCount - end); 3687 3688 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3689 children[i] = null; 3690 } 3691 } 3692 3693 mChildrenCount -= (end - start); 3694 } 3695 3696 private void bindLayoutAnimation(View child) { 3697 Animation a = mLayoutAnimationController.getAnimationForView(child); 3698 child.setAnimation(a); 3699 } 3700 3701 /** 3702 * Subclasses should override this method to set layout animation 3703 * parameters on the supplied child. 3704 * 3705 * @param child the child to associate with animation parameters 3706 * @param params the child's layout parameters which hold the animation 3707 * parameters 3708 * @param index the index of the child in the view group 3709 * @param count the number of children in the view group 3710 */ 3711 protected void attachLayoutAnimationParameters(View child, 3712 LayoutParams params, int index, int count) { 3713 LayoutAnimationController.AnimationParameters animationParams = 3714 params.layoutAnimationParameters; 3715 if (animationParams == null) { 3716 animationParams = new LayoutAnimationController.AnimationParameters(); 3717 params.layoutAnimationParameters = animationParams; 3718 } 3719 3720 animationParams.count = count; 3721 animationParams.index = index; 3722 } 3723 3724 /** 3725 * {@inheritDoc} 3726 * 3727 * <p><strong>Note:</strong> do not invoke this method from 3728 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3729 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3730 */ 3731 public void removeView(View view) { 3732 removeViewInternal(view); 3733 requestLayout(); 3734 invalidate(true); 3735 } 3736 3737 /** 3738 * Removes a view during layout. This is useful if in your onLayout() method, 3739 * you need to remove more views. 3740 * 3741 * <p><strong>Note:</strong> do not invoke this method from 3742 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3743 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3744 * 3745 * @param view the view to remove from the group 3746 */ 3747 public void removeViewInLayout(View view) { 3748 removeViewInternal(view); 3749 } 3750 3751 /** 3752 * Removes a range of views during layout. This is useful if in your onLayout() method, 3753 * you need to remove more views. 3754 * 3755 * <p><strong>Note:</strong> do not invoke this method from 3756 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3757 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3758 * 3759 * @param start the index of the first view to remove from the group 3760 * @param count the number of views to remove from the group 3761 */ 3762 public void removeViewsInLayout(int start, int count) { 3763 removeViewsInternal(start, count); 3764 } 3765 3766 /** 3767 * Removes the view at the specified position in the group. 3768 * 3769 * <p><strong>Note:</strong> do not invoke this method from 3770 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3771 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3772 * 3773 * @param index the position in the group of the view to remove 3774 */ 3775 public void removeViewAt(int index) { 3776 removeViewInternal(index, getChildAt(index)); 3777 requestLayout(); 3778 invalidate(true); 3779 } 3780 3781 /** 3782 * Removes the specified range of views from the group. 3783 * 3784 * <p><strong>Note:</strong> do not invoke this method from 3785 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3786 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3787 * 3788 * @param start the first position in the group of the range of views to remove 3789 * @param count the number of views to remove 3790 */ 3791 public void removeViews(int start, int count) { 3792 removeViewsInternal(start, count); 3793 requestLayout(); 3794 invalidate(true); 3795 } 3796 3797 private void removeViewInternal(View view) { 3798 final int index = indexOfChild(view); 3799 if (index >= 0) { 3800 removeViewInternal(index, view); 3801 } 3802 } 3803 3804 private void removeViewInternal(int index, View view) { 3805 3806 if (mTransition != null) { 3807 mTransition.removeChild(this, view); 3808 } 3809 3810 boolean clearChildFocus = false; 3811 if (view == mFocused) { 3812 view.unFocus(); 3813 clearChildFocus = true; 3814 } 3815 3816 if (view.isAccessibilityFocused()) { 3817 view.clearAccessibilityFocus(); 3818 } 3819 3820 cancelTouchTarget(view); 3821 cancelHoverTarget(view); 3822 3823 if (view.getAnimation() != null || 3824 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3825 addDisappearingView(view); 3826 } else if (view.mAttachInfo != null) { 3827 view.dispatchDetachedFromWindow(); 3828 } 3829 3830 if (view.hasTransientState()) { 3831 childHasTransientStateChanged(view, false); 3832 } 3833 3834 needGlobalAttributesUpdate(false); 3835 3836 removeFromArray(index); 3837 3838 if (clearChildFocus) { 3839 clearChildFocus(view); 3840 if (!rootViewRequestFocus()) { 3841 notifyGlobalFocusCleared(this); 3842 } 3843 } 3844 3845 onViewRemoved(view); 3846 3847 if (view.isImportantForAccessibility() && view.getVisibility() != View.GONE) { 3848 notifySubtreeAccessibilityStateChangedIfNeeded(); 3849 } 3850 } 3851 3852 /** 3853 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3854 * not null, changes in layout which occur because of children being added to or removed from 3855 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3856 * object. By default, the transition object is null (so layout changes are not animated). 3857 * 3858 * @param transition The LayoutTransition object that will animated changes in layout. A value 3859 * of <code>null</code> means no transition will run on layout changes. 3860 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3861 */ 3862 public void setLayoutTransition(LayoutTransition transition) { 3863 if (mTransition != null) { 3864 mTransition.removeTransitionListener(mLayoutTransitionListener); 3865 } 3866 mTransition = transition; 3867 if (mTransition != null) { 3868 mTransition.addTransitionListener(mLayoutTransitionListener); 3869 } 3870 } 3871 3872 /** 3873 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3874 * not null, changes in layout which occur because of children being added to or removed from 3875 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3876 * object. By default, the transition object is null (so layout changes are not animated). 3877 * 3878 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3879 * A value of <code>null</code> means no transition will run on layout changes. 3880 */ 3881 public LayoutTransition getLayoutTransition() { 3882 return mTransition; 3883 } 3884 3885 private void removeViewsInternal(int start, int count) { 3886 final View focused = mFocused; 3887 final boolean detach = mAttachInfo != null; 3888 boolean clearChildFocus = false; 3889 3890 final View[] children = mChildren; 3891 final int end = start + count; 3892 3893 for (int i = start; i < end; i++) { 3894 final View view = children[i]; 3895 3896 if (mTransition != null) { 3897 mTransition.removeChild(this, view); 3898 } 3899 3900 if (view == focused) { 3901 view.unFocus(); 3902 clearChildFocus = true; 3903 } 3904 3905 if (view.isAccessibilityFocused()) { 3906 view.clearAccessibilityFocus(); 3907 } 3908 3909 cancelTouchTarget(view); 3910 cancelHoverTarget(view); 3911 3912 if (view.getAnimation() != null || 3913 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3914 addDisappearingView(view); 3915 } else if (detach) { 3916 view.dispatchDetachedFromWindow(); 3917 } 3918 3919 if (view.hasTransientState()) { 3920 childHasTransientStateChanged(view, false); 3921 } 3922 3923 needGlobalAttributesUpdate(false); 3924 3925 onViewRemoved(view); 3926 } 3927 3928 removeFromArray(start, count); 3929 3930 if (clearChildFocus) { 3931 clearChildFocus(focused); 3932 if (!rootViewRequestFocus()) { 3933 notifyGlobalFocusCleared(focused); 3934 } 3935 } 3936 } 3937 3938 /** 3939 * Call this method to remove all child views from the 3940 * ViewGroup. 3941 * 3942 * <p><strong>Note:</strong> do not invoke this method from 3943 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3944 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3945 */ 3946 public void removeAllViews() { 3947 removeAllViewsInLayout(); 3948 requestLayout(); 3949 invalidate(true); 3950 } 3951 3952 /** 3953 * Called by a ViewGroup subclass to remove child views from itself, 3954 * when it must first know its size on screen before it can calculate how many 3955 * child views it will render. An example is a Gallery or a ListView, which 3956 * may "have" 50 children, but actually only render the number of children 3957 * that can currently fit inside the object on screen. Do not call 3958 * this method unless you are extending ViewGroup and understand the 3959 * view measuring and layout pipeline. 3960 * 3961 * <p><strong>Note:</strong> do not invoke this method from 3962 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3963 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3964 */ 3965 public void removeAllViewsInLayout() { 3966 final int count = mChildrenCount; 3967 if (count <= 0) { 3968 return; 3969 } 3970 3971 final View[] children = mChildren; 3972 mChildrenCount = 0; 3973 3974 final View focused = mFocused; 3975 final boolean detach = mAttachInfo != null; 3976 boolean clearChildFocus = false; 3977 3978 needGlobalAttributesUpdate(false); 3979 3980 for (int i = count - 1; i >= 0; i--) { 3981 final View view = children[i]; 3982 3983 if (mTransition != null) { 3984 mTransition.removeChild(this, view); 3985 } 3986 3987 if (view == focused) { 3988 view.unFocus(); 3989 clearChildFocus = true; 3990 } 3991 3992 if (view.isAccessibilityFocused()) { 3993 view.clearAccessibilityFocus(); 3994 } 3995 3996 cancelTouchTarget(view); 3997 cancelHoverTarget(view); 3998 3999 if (view.getAnimation() != null || 4000 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4001 addDisappearingView(view); 4002 } else if (detach) { 4003 view.dispatchDetachedFromWindow(); 4004 } 4005 4006 if (view.hasTransientState()) { 4007 childHasTransientStateChanged(view, false); 4008 } 4009 4010 onViewRemoved(view); 4011 4012 view.mParent = null; 4013 children[i] = null; 4014 } 4015 4016 if (clearChildFocus) { 4017 clearChildFocus(focused); 4018 if (!rootViewRequestFocus()) { 4019 notifyGlobalFocusCleared(focused); 4020 } 4021 } 4022 } 4023 4024 /** 4025 * Finishes the removal of a detached view. This method will dispatch the detached from 4026 * window event and notify the hierarchy change listener. 4027 * <p> 4028 * This method is intended to be lightweight and makes no assumptions about whether the 4029 * parent or child should be redrawn. Proper use of this method will include also making 4030 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4031 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4032 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4033 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4034 * 4035 * @param child the child to be definitely removed from the view hierarchy 4036 * @param animate if true and the view has an animation, the view is placed in the 4037 * disappearing views list, otherwise, it is detached from the window 4038 * 4039 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4040 * @see #detachAllViewsFromParent() 4041 * @see #detachViewFromParent(View) 4042 * @see #detachViewFromParent(int) 4043 */ 4044 protected void removeDetachedView(View child, boolean animate) { 4045 if (mTransition != null) { 4046 mTransition.removeChild(this, child); 4047 } 4048 4049 if (child == mFocused) { 4050 child.clearFocus(); 4051 } 4052 4053 child.clearAccessibilityFocus(); 4054 4055 cancelTouchTarget(child); 4056 cancelHoverTarget(child); 4057 4058 if ((animate && child.getAnimation() != null) || 4059 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4060 addDisappearingView(child); 4061 } else if (child.mAttachInfo != null) { 4062 child.dispatchDetachedFromWindow(); 4063 } 4064 4065 if (child.hasTransientState()) { 4066 childHasTransientStateChanged(child, false); 4067 } 4068 4069 onViewRemoved(child); 4070 } 4071 4072 /** 4073 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4074 * sets the layout parameters and puts the view in the list of children so that 4075 * it can be retrieved by calling {@link #getChildAt(int)}. 4076 * <p> 4077 * This method is intended to be lightweight and makes no assumptions about whether the 4078 * parent or child should be redrawn. Proper use of this method will include also making 4079 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4080 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4081 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4082 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4083 * <p> 4084 * This method should be called only for views which were detached from their parent. 4085 * 4086 * @param child the child to attach 4087 * @param index the index at which the child should be attached 4088 * @param params the layout parameters of the child 4089 * 4090 * @see #removeDetachedView(View, boolean) 4091 * @see #detachAllViewsFromParent() 4092 * @see #detachViewFromParent(View) 4093 * @see #detachViewFromParent(int) 4094 */ 4095 protected void attachViewToParent(View child, int index, LayoutParams params) { 4096 child.mLayoutParams = params; 4097 4098 if (index < 0) { 4099 index = mChildrenCount; 4100 } 4101 4102 addInArray(child, index); 4103 4104 child.mParent = this; 4105 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4106 & ~PFLAG_DRAWING_CACHE_VALID) 4107 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4108 this.mPrivateFlags |= PFLAG_INVALIDATED; 4109 4110 if (child.hasFocus()) { 4111 requestChildFocus(child, child.findFocus()); 4112 } 4113 } 4114 4115 /** 4116 * Detaches a view from its parent. Detaching a view should be followed 4117 * either by a call to 4118 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4119 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4120 * temporary; reattachment or removal should happen within the same drawing cycle as 4121 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4122 * call to {@link #getChildAt(int)}. 4123 * 4124 * @param child the child to detach 4125 * 4126 * @see #detachViewFromParent(int) 4127 * @see #detachViewsFromParent(int, int) 4128 * @see #detachAllViewsFromParent() 4129 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4130 * @see #removeDetachedView(View, boolean) 4131 */ 4132 protected void detachViewFromParent(View child) { 4133 removeFromArray(indexOfChild(child)); 4134 } 4135 4136 /** 4137 * Detaches a view from its parent. Detaching a view should be followed 4138 * either by a call to 4139 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4140 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4141 * temporary; reattachment or removal should happen within the same drawing cycle as 4142 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4143 * call to {@link #getChildAt(int)}. 4144 * 4145 * @param index the index of the child to detach 4146 * 4147 * @see #detachViewFromParent(View) 4148 * @see #detachAllViewsFromParent() 4149 * @see #detachViewsFromParent(int, int) 4150 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4151 * @see #removeDetachedView(View, boolean) 4152 */ 4153 protected void detachViewFromParent(int index) { 4154 removeFromArray(index); 4155 } 4156 4157 /** 4158 * Detaches a range of views from their parents. Detaching a view should be followed 4159 * either by a call to 4160 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4161 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4162 * temporary; reattachment or removal should happen within the same drawing cycle as 4163 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4164 * call to {@link #getChildAt(int)}. 4165 * 4166 * @param start the first index of the childrend range to detach 4167 * @param count the number of children to detach 4168 * 4169 * @see #detachViewFromParent(View) 4170 * @see #detachViewFromParent(int) 4171 * @see #detachAllViewsFromParent() 4172 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4173 * @see #removeDetachedView(View, boolean) 4174 */ 4175 protected void detachViewsFromParent(int start, int count) { 4176 removeFromArray(start, count); 4177 } 4178 4179 /** 4180 * Detaches all views from the parent. Detaching a view should be followed 4181 * either by a call to 4182 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4183 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4184 * temporary; reattachment or removal should happen within the same drawing cycle as 4185 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4186 * call to {@link #getChildAt(int)}. 4187 * 4188 * @see #detachViewFromParent(View) 4189 * @see #detachViewFromParent(int) 4190 * @see #detachViewsFromParent(int, int) 4191 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4192 * @see #removeDetachedView(View, boolean) 4193 */ 4194 protected void detachAllViewsFromParent() { 4195 final int count = mChildrenCount; 4196 if (count <= 0) { 4197 return; 4198 } 4199 4200 final View[] children = mChildren; 4201 mChildrenCount = 0; 4202 4203 for (int i = count - 1; i >= 0; i--) { 4204 children[i].mParent = null; 4205 children[i] = null; 4206 } 4207 } 4208 4209 /** 4210 * Don't call or override this method. It is used for the implementation of 4211 * the view hierarchy. 4212 */ 4213 public final void invalidateChild(View child, final Rect dirty) { 4214 ViewParent parent = this; 4215 4216 final AttachInfo attachInfo = mAttachInfo; 4217 if (attachInfo != null) { 4218 // If the child is drawing an animation, we want to copy this flag onto 4219 // ourselves and the parent to make sure the invalidate request goes 4220 // through 4221 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4222 == PFLAG_DRAW_ANIMATION; 4223 4224 // Check whether the child that requests the invalidate is fully opaque 4225 // Views being animated or transformed are not considered opaque because we may 4226 // be invalidating their old position and need the parent to paint behind them. 4227 Matrix childMatrix = child.getMatrix(); 4228 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4229 child.getAnimation() == null && childMatrix.isIdentity(); 4230 // Mark the child as dirty, using the appropriate flag 4231 // Make sure we do not set both flags at the same time 4232 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4233 4234 if (child.mLayerType != LAYER_TYPE_NONE) { 4235 mPrivateFlags |= PFLAG_INVALIDATED; 4236 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4237 child.mLocalDirtyRect.union(dirty); 4238 } 4239 4240 final int[] location = attachInfo.mInvalidateChildLocation; 4241 location[CHILD_LEFT_INDEX] = child.mLeft; 4242 location[CHILD_TOP_INDEX] = child.mTop; 4243 if (!childMatrix.isIdentity() || 4244 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4245 RectF boundingRect = attachInfo.mTmpTransformRect; 4246 boundingRect.set(dirty); 4247 Matrix transformMatrix; 4248 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4249 Transformation t = attachInfo.mTmpTransformation; 4250 boolean transformed = getChildStaticTransformation(child, t); 4251 if (transformed) { 4252 transformMatrix = attachInfo.mTmpMatrix; 4253 transformMatrix.set(t.getMatrix()); 4254 if (!childMatrix.isIdentity()) { 4255 transformMatrix.preConcat(childMatrix); 4256 } 4257 } else { 4258 transformMatrix = childMatrix; 4259 } 4260 } else { 4261 transformMatrix = childMatrix; 4262 } 4263 transformMatrix.mapRect(boundingRect); 4264 dirty.set((int) (boundingRect.left - 0.5f), 4265 (int) (boundingRect.top - 0.5f), 4266 (int) (boundingRect.right + 0.5f), 4267 (int) (boundingRect.bottom + 0.5f)); 4268 } 4269 4270 do { 4271 View view = null; 4272 if (parent instanceof View) { 4273 view = (View) parent; 4274 } 4275 4276 if (drawAnimation) { 4277 if (view != null) { 4278 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4279 } else if (parent instanceof ViewRootImpl) { 4280 ((ViewRootImpl) parent).mIsAnimating = true; 4281 } 4282 } 4283 4284 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4285 // flag coming from the child that initiated the invalidate 4286 if (view != null) { 4287 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4288 view.getSolidColor() == 0) { 4289 opaqueFlag = PFLAG_DIRTY; 4290 } 4291 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4292 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4293 } 4294 } 4295 4296 parent = parent.invalidateChildInParent(location, dirty); 4297 if (view != null) { 4298 // Account for transform on current parent 4299 Matrix m = view.getMatrix(); 4300 if (!m.isIdentity()) { 4301 RectF boundingRect = attachInfo.mTmpTransformRect; 4302 boundingRect.set(dirty); 4303 m.mapRect(boundingRect); 4304 dirty.set((int) (boundingRect.left - 0.5f), 4305 (int) (boundingRect.top - 0.5f), 4306 (int) (boundingRect.right + 0.5f), 4307 (int) (boundingRect.bottom + 0.5f)); 4308 } 4309 } 4310 } while (parent != null); 4311 } 4312 } 4313 4314 /** 4315 * Don't call or override this method. It is used for the implementation of 4316 * the view hierarchy. 4317 * 4318 * This implementation returns null if this ViewGroup does not have a parent, 4319 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4320 * does not intersect with this ViewGroup's bounds. 4321 */ 4322 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4323 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4324 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4325 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4326 FLAG_OPTIMIZE_INVALIDATE) { 4327 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4328 location[CHILD_TOP_INDEX] - mScrollY); 4329 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4330 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4331 } 4332 4333 final int left = mLeft; 4334 final int top = mTop; 4335 4336 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4337 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4338 dirty.setEmpty(); 4339 } 4340 } 4341 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4342 4343 location[CHILD_LEFT_INDEX] = left; 4344 location[CHILD_TOP_INDEX] = top; 4345 4346 if (mLayerType != LAYER_TYPE_NONE) { 4347 mPrivateFlags |= PFLAG_INVALIDATED; 4348 mLocalDirtyRect.union(dirty); 4349 } 4350 4351 return mParent; 4352 4353 } else { 4354 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4355 4356 location[CHILD_LEFT_INDEX] = mLeft; 4357 location[CHILD_TOP_INDEX] = mTop; 4358 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4359 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4360 } else { 4361 // in case the dirty rect extends outside the bounds of this container 4362 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4363 } 4364 4365 if (mLayerType != LAYER_TYPE_NONE) { 4366 mPrivateFlags |= PFLAG_INVALIDATED; 4367 mLocalDirtyRect.union(dirty); 4368 } 4369 4370 return mParent; 4371 } 4372 } 4373 4374 return null; 4375 } 4376 4377 /** 4378 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4379 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4380 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4381 * 4382 * @hide 4383 */ 4384 public void invalidateChildFast(View child, final Rect dirty) { 4385 ViewParent parent = this; 4386 4387 final AttachInfo attachInfo = mAttachInfo; 4388 if (attachInfo != null) { 4389 if (child.mLayerType != LAYER_TYPE_NONE) { 4390 child.mLocalDirtyRect.union(dirty); 4391 } 4392 4393 int left = child.mLeft; 4394 int top = child.mTop; 4395 if (!child.getMatrix().isIdentity()) { 4396 child.transformRect(dirty); 4397 } 4398 4399 do { 4400 if (parent instanceof ViewGroup) { 4401 ViewGroup parentVG = (ViewGroup) parent; 4402 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4403 // Layered parents should be recreated, not just re-issued 4404 parentVG.invalidate(); 4405 parent = null; 4406 } else { 4407 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4408 left = parentVG.mLeft; 4409 top = parentVG.mTop; 4410 } 4411 } else { 4412 // Reached the top; this calls into the usual invalidate method in 4413 // ViewRootImpl, which schedules a traversal 4414 final int[] location = attachInfo.mInvalidateChildLocation; 4415 location[0] = left; 4416 location[1] = top; 4417 parent = parent.invalidateChildInParent(location, dirty); 4418 } 4419 } while (parent != null); 4420 } 4421 } 4422 4423 /** 4424 * Quick invalidation method that simply transforms the dirty rect into the parent's 4425 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4426 */ 4427 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4428 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4429 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4430 dirty.offset(left - mScrollX, top - mScrollY); 4431 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4432 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4433 } 4434 4435 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4436 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4437 4438 if (mLayerType != LAYER_TYPE_NONE) { 4439 mLocalDirtyRect.union(dirty); 4440 } 4441 if (!getMatrix().isIdentity()) { 4442 transformRect(dirty); 4443 } 4444 4445 return mParent; 4446 } 4447 } 4448 4449 return null; 4450 } 4451 4452 /** 4453 * Offset a rectangle that is in a descendant's coordinate 4454 * space into our coordinate space. 4455 * @param descendant A descendant of this view 4456 * @param rect A rectangle defined in descendant's coordinate space. 4457 */ 4458 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4459 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4460 } 4461 4462 /** 4463 * Offset a rectangle that is in our coordinate space into an ancestor's 4464 * coordinate space. 4465 * @param descendant A descendant of this view 4466 * @param rect A rectangle defined in descendant's coordinate space. 4467 */ 4468 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4469 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4470 } 4471 4472 /** 4473 * Helper method that offsets a rect either from parent to descendant or 4474 * descendant to parent. 4475 */ 4476 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4477 boolean offsetFromChildToParent, boolean clipToBounds) { 4478 4479 // already in the same coord system :) 4480 if (descendant == this) { 4481 return; 4482 } 4483 4484 ViewParent theParent = descendant.mParent; 4485 4486 // search and offset up to the parent 4487 while ((theParent != null) 4488 && (theParent instanceof View) 4489 && (theParent != this)) { 4490 4491 if (offsetFromChildToParent) { 4492 rect.offset(descendant.mLeft - descendant.mScrollX, 4493 descendant.mTop - descendant.mScrollY); 4494 if (clipToBounds) { 4495 View p = (View) theParent; 4496 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4497 } 4498 } else { 4499 if (clipToBounds) { 4500 View p = (View) theParent; 4501 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4502 } 4503 rect.offset(descendant.mScrollX - descendant.mLeft, 4504 descendant.mScrollY - descendant.mTop); 4505 } 4506 4507 descendant = (View) theParent; 4508 theParent = descendant.mParent; 4509 } 4510 4511 // now that we are up to this view, need to offset one more time 4512 // to get into our coordinate space 4513 if (theParent == this) { 4514 if (offsetFromChildToParent) { 4515 rect.offset(descendant.mLeft - descendant.mScrollX, 4516 descendant.mTop - descendant.mScrollY); 4517 } else { 4518 rect.offset(descendant.mScrollX - descendant.mLeft, 4519 descendant.mScrollY - descendant.mTop); 4520 } 4521 } else { 4522 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4523 } 4524 } 4525 4526 /** 4527 * Offset the vertical location of all children of this view by the specified number of pixels. 4528 * 4529 * @param offset the number of pixels to offset 4530 * 4531 * @hide 4532 */ 4533 public void offsetChildrenTopAndBottom(int offset) { 4534 final int count = mChildrenCount; 4535 final View[] children = mChildren; 4536 boolean invalidate = false; 4537 4538 for (int i = 0; i < count; i++) { 4539 final View v = children[i]; 4540 v.mTop += offset; 4541 v.mBottom += offset; 4542 if (v.mDisplayList != null) { 4543 invalidate = true; 4544 v.mDisplayList.offsetTopAndBottom(offset); 4545 } 4546 } 4547 4548 if (invalidate) { 4549 invalidateViewProperty(false, false); 4550 } 4551 } 4552 4553 /** 4554 * {@inheritDoc} 4555 */ 4556 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4557 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4558 // but for some simple tests it can be useful. If we don't have attach info this 4559 // will allocate memory. 4560 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4561 rect.set(r); 4562 4563 if (!child.hasIdentityMatrix()) { 4564 child.getMatrix().mapRect(rect); 4565 } 4566 4567 int dx = child.mLeft - mScrollX; 4568 int dy = child.mTop - mScrollY; 4569 4570 rect.offset(dx, dy); 4571 4572 if (offset != null) { 4573 if (!child.hasIdentityMatrix()) { 4574 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4575 : new float[2]; 4576 position[0] = offset.x; 4577 position[1] = offset.y; 4578 child.getMatrix().mapPoints(position); 4579 offset.x = (int) (position[0] + 0.5f); 4580 offset.y = (int) (position[1] + 0.5f); 4581 } 4582 offset.x += dx; 4583 offset.y += dy; 4584 } 4585 4586 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4587 if (mParent == null) return true; 4588 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4589 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4590 return mParent.getChildVisibleRect(this, r, offset); 4591 } 4592 4593 return false; 4594 } 4595 4596 /** 4597 * {@inheritDoc} 4598 */ 4599 @Override 4600 public final void layout(int l, int t, int r, int b) { 4601 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 4602 if (mTransition != null) { 4603 mTransition.layoutChange(this); 4604 } 4605 super.layout(l, t, r, b); 4606 } else { 4607 // record the fact that we noop'd it; request layout when transition finishes 4608 mLayoutCalledWhileSuppressed = true; 4609 } 4610 } 4611 4612 /** 4613 * {@inheritDoc} 4614 */ 4615 @Override 4616 protected abstract void onLayout(boolean changed, 4617 int l, int t, int r, int b); 4618 4619 /** 4620 * Indicates whether the view group has the ability to animate its children 4621 * after the first layout. 4622 * 4623 * @return true if the children can be animated, false otherwise 4624 */ 4625 protected boolean canAnimate() { 4626 return mLayoutAnimationController != null; 4627 } 4628 4629 /** 4630 * Runs the layout animation. Calling this method triggers a relayout of 4631 * this view group. 4632 */ 4633 public void startLayoutAnimation() { 4634 if (mLayoutAnimationController != null) { 4635 mGroupFlags |= FLAG_RUN_ANIMATION; 4636 requestLayout(); 4637 } 4638 } 4639 4640 /** 4641 * Schedules the layout animation to be played after the next layout pass 4642 * of this view group. This can be used to restart the layout animation 4643 * when the content of the view group changes or when the activity is 4644 * paused and resumed. 4645 */ 4646 public void scheduleLayoutAnimation() { 4647 mGroupFlags |= FLAG_RUN_ANIMATION; 4648 } 4649 4650 /** 4651 * Sets the layout animation controller used to animate the group's 4652 * children after the first layout. 4653 * 4654 * @param controller the animation controller 4655 */ 4656 public void setLayoutAnimation(LayoutAnimationController controller) { 4657 mLayoutAnimationController = controller; 4658 if (mLayoutAnimationController != null) { 4659 mGroupFlags |= FLAG_RUN_ANIMATION; 4660 } 4661 } 4662 4663 /** 4664 * Returns the layout animation controller used to animate the group's 4665 * children. 4666 * 4667 * @return the current animation controller 4668 */ 4669 public LayoutAnimationController getLayoutAnimation() { 4670 return mLayoutAnimationController; 4671 } 4672 4673 /** 4674 * Indicates whether the children's drawing cache is used during a layout 4675 * animation. By default, the drawing cache is enabled but this will prevent 4676 * nested layout animations from working. To nest animations, you must disable 4677 * the cache. 4678 * 4679 * @return true if the animation cache is enabled, false otherwise 4680 * 4681 * @see #setAnimationCacheEnabled(boolean) 4682 * @see View#setDrawingCacheEnabled(boolean) 4683 */ 4684 @ViewDebug.ExportedProperty 4685 public boolean isAnimationCacheEnabled() { 4686 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4687 } 4688 4689 /** 4690 * Enables or disables the children's drawing cache during a layout animation. 4691 * By default, the drawing cache is enabled but this will prevent nested 4692 * layout animations from working. To nest animations, you must disable the 4693 * cache. 4694 * 4695 * @param enabled true to enable the animation cache, false otherwise 4696 * 4697 * @see #isAnimationCacheEnabled() 4698 * @see View#setDrawingCacheEnabled(boolean) 4699 */ 4700 public void setAnimationCacheEnabled(boolean enabled) { 4701 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4702 } 4703 4704 /** 4705 * Indicates whether this ViewGroup will always try to draw its children using their 4706 * drawing cache. By default this property is enabled. 4707 * 4708 * @return true if the animation cache is enabled, false otherwise 4709 * 4710 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4711 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4712 * @see View#setDrawingCacheEnabled(boolean) 4713 */ 4714 @ViewDebug.ExportedProperty(category = "drawing") 4715 public boolean isAlwaysDrawnWithCacheEnabled() { 4716 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4717 } 4718 4719 /** 4720 * Indicates whether this ViewGroup will always try to draw its children using their 4721 * drawing cache. This property can be set to true when the cache rendering is 4722 * slightly different from the children's normal rendering. Renderings can be different, 4723 * for instance, when the cache's quality is set to low. 4724 * 4725 * When this property is disabled, the ViewGroup will use the drawing cache of its 4726 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4727 * when to start using the drawing cache and when to stop using it. 4728 * 4729 * @param always true to always draw with the drawing cache, false otherwise 4730 * 4731 * @see #isAlwaysDrawnWithCacheEnabled() 4732 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4733 * @see View#setDrawingCacheEnabled(boolean) 4734 * @see View#setDrawingCacheQuality(int) 4735 */ 4736 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4737 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4738 } 4739 4740 /** 4741 * Indicates whether the ViewGroup is currently drawing its children using 4742 * their drawing cache. 4743 * 4744 * @return true if children should be drawn with their cache, false otherwise 4745 * 4746 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4747 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4748 */ 4749 @ViewDebug.ExportedProperty(category = "drawing") 4750 protected boolean isChildrenDrawnWithCacheEnabled() { 4751 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4752 } 4753 4754 /** 4755 * Tells the ViewGroup to draw its children using their drawing cache. This property 4756 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4757 * will be used only if it has been enabled. 4758 * 4759 * Subclasses should call this method to start and stop using the drawing cache when 4760 * they perform performance sensitive operations, like scrolling or animating. 4761 * 4762 * @param enabled true if children should be drawn with their cache, false otherwise 4763 * 4764 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4765 * @see #isChildrenDrawnWithCacheEnabled() 4766 */ 4767 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4768 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4769 } 4770 4771 /** 4772 * Indicates whether the ViewGroup is drawing its children in the order defined by 4773 * {@link #getChildDrawingOrder(int, int)}. 4774 * 4775 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4776 * false otherwise 4777 * 4778 * @see #setChildrenDrawingOrderEnabled(boolean) 4779 * @see #getChildDrawingOrder(int, int) 4780 */ 4781 @ViewDebug.ExportedProperty(category = "drawing") 4782 protected boolean isChildrenDrawingOrderEnabled() { 4783 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4784 } 4785 4786 /** 4787 * Tells the ViewGroup whether to draw its children in the order defined by the method 4788 * {@link #getChildDrawingOrder(int, int)}. 4789 * 4790 * @param enabled true if the order of the children when drawing is determined by 4791 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4792 * 4793 * @see #isChildrenDrawingOrderEnabled() 4794 * @see #getChildDrawingOrder(int, int) 4795 */ 4796 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4797 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4798 } 4799 4800 private boolean hasBooleanFlag(int flag) { 4801 return (mGroupFlags & flag) == flag; 4802 } 4803 4804 private void setBooleanFlag(int flag, boolean value) { 4805 if (value) { 4806 mGroupFlags |= flag; 4807 } else { 4808 mGroupFlags &= ~flag; 4809 } 4810 } 4811 4812 /** 4813 * Returns an integer indicating what types of drawing caches are kept in memory. 4814 * 4815 * @see #setPersistentDrawingCache(int) 4816 * @see #setAnimationCacheEnabled(boolean) 4817 * 4818 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4819 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4820 * and {@link #PERSISTENT_ALL_CACHES} 4821 */ 4822 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4823 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4824 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4825 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4826 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4827 }) 4828 public int getPersistentDrawingCache() { 4829 return mPersistentDrawingCache; 4830 } 4831 4832 /** 4833 * Indicates what types of drawing caches should be kept in memory after 4834 * they have been created. 4835 * 4836 * @see #getPersistentDrawingCache() 4837 * @see #setAnimationCacheEnabled(boolean) 4838 * 4839 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4840 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4841 * and {@link #PERSISTENT_ALL_CACHES} 4842 */ 4843 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4844 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4845 } 4846 4847 private void setLayoutMode(int layoutMode, boolean explicitly) { 4848 mLayoutMode = layoutMode; 4849 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4850 } 4851 4852 /** 4853 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4854 * descendants that had inherited a different layoutMode from a previous parent. 4855 * Recursion terminates when a descendant's mode is: 4856 * <ul> 4857 * <li>Undefined</li> 4858 * <li>The same as the root node's</li> 4859 * <li>A mode that had been explicitly set</li> 4860 * <ul/> 4861 * The first two clauses are optimizations. 4862 * @param layoutModeOfRoot 4863 */ 4864 @Override 4865 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4866 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4867 mLayoutMode == layoutModeOfRoot || 4868 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4869 return; 4870 } 4871 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4872 4873 // apply recursively 4874 for (int i = 0, N = getChildCount(); i < N; i++) { 4875 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4876 } 4877 } 4878 4879 /** 4880 * Returns the basis of alignment during layout operations on this ViewGroup: 4881 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4882 * <p> 4883 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4884 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4885 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4886 * 4887 * @return the layout mode to use during layout operations 4888 * 4889 * @see #setLayoutMode(int) 4890 */ 4891 public int getLayoutMode() { 4892 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4893 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4894 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4895 setLayoutMode(inheritedLayoutMode, false); 4896 } 4897 return mLayoutMode; 4898 } 4899 4900 /** 4901 * Sets the basis of alignment during the layout of this ViewGroup. 4902 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4903 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4904 * 4905 * @param layoutMode the layout mode to use during layout operations 4906 * 4907 * @see #getLayoutMode() 4908 */ 4909 public void setLayoutMode(int layoutMode) { 4910 if (mLayoutMode != layoutMode) { 4911 invalidateInheritedLayoutMode(layoutMode); 4912 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4913 requestLayout(); 4914 } 4915 } 4916 4917 /** 4918 * Returns a new set of layout parameters based on the supplied attributes set. 4919 * 4920 * @param attrs the attributes to build the layout parameters from 4921 * 4922 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4923 * of its descendants 4924 */ 4925 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4926 return new LayoutParams(getContext(), attrs); 4927 } 4928 4929 /** 4930 * Returns a safe set of layout parameters based on the supplied layout params. 4931 * When a ViewGroup is passed a View whose layout params do not pass the test of 4932 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4933 * is invoked. This method should return a new set of layout params suitable for 4934 * this ViewGroup, possibly by copying the appropriate attributes from the 4935 * specified set of layout params. 4936 * 4937 * @param p The layout parameters to convert into a suitable set of layout parameters 4938 * for this ViewGroup. 4939 * 4940 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4941 * of its descendants 4942 */ 4943 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4944 return p; 4945 } 4946 4947 /** 4948 * Returns a set of default layout parameters. These parameters are requested 4949 * when the View passed to {@link #addView(View)} has no layout parameters 4950 * already set. If null is returned, an exception is thrown from addView. 4951 * 4952 * @return a set of default layout parameters or null 4953 */ 4954 protected LayoutParams generateDefaultLayoutParams() { 4955 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4956 } 4957 4958 /** 4959 * {@inheritDoc} 4960 */ 4961 @Override 4962 protected void debug(int depth) { 4963 super.debug(depth); 4964 String output; 4965 4966 if (mFocused != null) { 4967 output = debugIndent(depth); 4968 output += "mFocused"; 4969 Log.d(VIEW_LOG_TAG, output); 4970 } 4971 if (mChildrenCount != 0) { 4972 output = debugIndent(depth); 4973 output += "{"; 4974 Log.d(VIEW_LOG_TAG, output); 4975 } 4976 int count = mChildrenCount; 4977 for (int i = 0; i < count; i++) { 4978 View child = mChildren[i]; 4979 child.debug(depth + 1); 4980 } 4981 4982 if (mChildrenCount != 0) { 4983 output = debugIndent(depth); 4984 output += "}"; 4985 Log.d(VIEW_LOG_TAG, output); 4986 } 4987 } 4988 4989 /** 4990 * Returns the position in the group of the specified child view. 4991 * 4992 * @param child the view for which to get the position 4993 * @return a positive integer representing the position of the view in the 4994 * group, or -1 if the view does not exist in the group 4995 */ 4996 public int indexOfChild(View child) { 4997 final int count = mChildrenCount; 4998 final View[] children = mChildren; 4999 for (int i = 0; i < count; i++) { 5000 if (children[i] == child) { 5001 return i; 5002 } 5003 } 5004 return -1; 5005 } 5006 5007 /** 5008 * Returns the number of children in the group. 5009 * 5010 * @return a positive integer representing the number of children in 5011 * the group 5012 */ 5013 public int getChildCount() { 5014 return mChildrenCount; 5015 } 5016 5017 /** 5018 * Returns the view at the specified position in the group. 5019 * 5020 * @param index the position at which to get the view from 5021 * @return the view at the specified position or null if the position 5022 * does not exist within the group 5023 */ 5024 public View getChildAt(int index) { 5025 if (index < 0 || index >= mChildrenCount) { 5026 return null; 5027 } 5028 return mChildren[index]; 5029 } 5030 5031 /** 5032 * Ask all of the children of this view to measure themselves, taking into 5033 * account both the MeasureSpec requirements for this view and its padding. 5034 * We skip children that are in the GONE state The heavy lifting is done in 5035 * getChildMeasureSpec. 5036 * 5037 * @param widthMeasureSpec The width requirements for this view 5038 * @param heightMeasureSpec The height requirements for this view 5039 */ 5040 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5041 final int size = mChildrenCount; 5042 final View[] children = mChildren; 5043 for (int i = 0; i < size; ++i) { 5044 final View child = children[i]; 5045 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5046 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5047 } 5048 } 5049 } 5050 5051 /** 5052 * Ask one of the children of this view to measure itself, taking into 5053 * account both the MeasureSpec requirements for this view and its padding. 5054 * The heavy lifting is done in getChildMeasureSpec. 5055 * 5056 * @param child The child to measure 5057 * @param parentWidthMeasureSpec The width requirements for this view 5058 * @param parentHeightMeasureSpec The height requirements for this view 5059 */ 5060 protected void measureChild(View child, int parentWidthMeasureSpec, 5061 int parentHeightMeasureSpec) { 5062 final LayoutParams lp = child.getLayoutParams(); 5063 5064 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5065 mPaddingLeft + mPaddingRight, lp.width); 5066 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5067 mPaddingTop + mPaddingBottom, lp.height); 5068 5069 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5070 } 5071 5072 /** 5073 * Ask one of the children of this view to measure itself, taking into 5074 * account both the MeasureSpec requirements for this view and its padding 5075 * and margins. The child must have MarginLayoutParams The heavy lifting is 5076 * done in getChildMeasureSpec. 5077 * 5078 * @param child The child to measure 5079 * @param parentWidthMeasureSpec The width requirements for this view 5080 * @param widthUsed Extra space that has been used up by the parent 5081 * horizontally (possibly by other children of the parent) 5082 * @param parentHeightMeasureSpec The height requirements for this view 5083 * @param heightUsed Extra space that has been used up by the parent 5084 * vertically (possibly by other children of the parent) 5085 */ 5086 protected void measureChildWithMargins(View child, 5087 int parentWidthMeasureSpec, int widthUsed, 5088 int parentHeightMeasureSpec, int heightUsed) { 5089 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5090 5091 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5092 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5093 + widthUsed, lp.width); 5094 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5095 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5096 + heightUsed, lp.height); 5097 5098 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5099 } 5100 5101 /** 5102 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5103 * pass to a particular child. This method figures out the right MeasureSpec 5104 * for one dimension (height or width) of one child view. 5105 * 5106 * The goal is to combine information from our MeasureSpec with the 5107 * LayoutParams of the child to get the best possible results. For example, 5108 * if the this view knows its size (because its MeasureSpec has a mode of 5109 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5110 * to be the same size as the parent, the parent should ask the child to 5111 * layout given an exact size. 5112 * 5113 * @param spec The requirements for this view 5114 * @param padding The padding of this view for the current dimension and 5115 * margins, if applicable 5116 * @param childDimension How big the child wants to be in the current 5117 * dimension 5118 * @return a MeasureSpec integer for the child 5119 */ 5120 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5121 int specMode = MeasureSpec.getMode(spec); 5122 int specSize = MeasureSpec.getSize(spec); 5123 5124 int size = Math.max(0, specSize - padding); 5125 5126 int resultSize = 0; 5127 int resultMode = 0; 5128 5129 switch (specMode) { 5130 // Parent has imposed an exact size on us 5131 case MeasureSpec.EXACTLY: 5132 if (childDimension >= 0) { 5133 resultSize = childDimension; 5134 resultMode = MeasureSpec.EXACTLY; 5135 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5136 // Child wants to be our size. So be it. 5137 resultSize = size; 5138 resultMode = MeasureSpec.EXACTLY; 5139 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5140 // Child wants to determine its own size. It can't be 5141 // bigger than us. 5142 resultSize = size; 5143 resultMode = MeasureSpec.AT_MOST; 5144 } 5145 break; 5146 5147 // Parent has imposed a maximum size on us 5148 case MeasureSpec.AT_MOST: 5149 if (childDimension >= 0) { 5150 // Child wants a specific size... so be it 5151 resultSize = childDimension; 5152 resultMode = MeasureSpec.EXACTLY; 5153 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5154 // Child wants to be our size, but our size is not fixed. 5155 // Constrain child to not be bigger than us. 5156 resultSize = size; 5157 resultMode = MeasureSpec.AT_MOST; 5158 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5159 // Child wants to determine its own size. It can't be 5160 // bigger than us. 5161 resultSize = size; 5162 resultMode = MeasureSpec.AT_MOST; 5163 } 5164 break; 5165 5166 // Parent asked to see how big we want to be 5167 case MeasureSpec.UNSPECIFIED: 5168 if (childDimension >= 0) { 5169 // Child wants a specific size... let him have it 5170 resultSize = childDimension; 5171 resultMode = MeasureSpec.EXACTLY; 5172 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5173 // Child wants to be our size... find out how big it should 5174 // be 5175 resultSize = 0; 5176 resultMode = MeasureSpec.UNSPECIFIED; 5177 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5178 // Child wants to determine its own size.... find out how 5179 // big it should be 5180 resultSize = 0; 5181 resultMode = MeasureSpec.UNSPECIFIED; 5182 } 5183 break; 5184 } 5185 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5186 } 5187 5188 5189 /** 5190 * Removes any pending animations for views that have been removed. Call 5191 * this if you don't want animations for exiting views to stack up. 5192 */ 5193 public void clearDisappearingChildren() { 5194 if (mDisappearingChildren != null) { 5195 mDisappearingChildren.clear(); 5196 invalidate(); 5197 } 5198 } 5199 5200 /** 5201 * Add a view which is removed from mChildren but still needs animation 5202 * 5203 * @param v View to add 5204 */ 5205 private void addDisappearingView(View v) { 5206 ArrayList<View> disappearingChildren = mDisappearingChildren; 5207 5208 if (disappearingChildren == null) { 5209 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5210 } 5211 5212 disappearingChildren.add(v); 5213 } 5214 5215 /** 5216 * Cleanup a view when its animation is done. This may mean removing it from 5217 * the list of disappearing views. 5218 * 5219 * @param view The view whose animation has finished 5220 * @param animation The animation, cannot be null 5221 */ 5222 void finishAnimatingView(final View view, Animation animation) { 5223 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5224 if (disappearingChildren != null) { 5225 if (disappearingChildren.contains(view)) { 5226 disappearingChildren.remove(view); 5227 5228 if (view.mAttachInfo != null) { 5229 view.dispatchDetachedFromWindow(); 5230 } 5231 5232 view.clearAnimation(); 5233 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5234 } 5235 } 5236 5237 if (animation != null && !animation.getFillAfter()) { 5238 view.clearAnimation(); 5239 } 5240 5241 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5242 view.onAnimationEnd(); 5243 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5244 // so we'd rather be safe than sorry 5245 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5246 // Draw one more frame after the animation is done 5247 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5248 } 5249 } 5250 5251 /** 5252 * Utility function called by View during invalidation to determine whether a view that 5253 * is invisible or gone should still be invalidated because it is being transitioned (and 5254 * therefore still needs to be drawn). 5255 */ 5256 boolean isViewTransitioning(View view) { 5257 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5258 } 5259 5260 /** 5261 * This method tells the ViewGroup that the given View object, which should have this 5262 * ViewGroup as its parent, 5263 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5264 * is removed from its parent. This allows animations, such as those used by 5265 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5266 * the removal of views. A call to this method should always be accompanied by a later call 5267 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5268 * so that the View finally gets removed. 5269 * 5270 * @param view The View object to be kept visible even if it gets removed from its parent. 5271 */ 5272 public void startViewTransition(View view) { 5273 if (view.mParent == this) { 5274 if (mTransitioningViews == null) { 5275 mTransitioningViews = new ArrayList<View>(); 5276 } 5277 mTransitioningViews.add(view); 5278 } 5279 } 5280 5281 /** 5282 * This method should always be called following an earlier call to 5283 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5284 * and will no longer be displayed. Note that this method does not perform the functionality 5285 * of removing a view from its parent; it just discontinues the display of a View that 5286 * has previously been removed. 5287 * 5288 * @return view The View object that has been removed but is being kept around in the visible 5289 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5290 */ 5291 public void endViewTransition(View view) { 5292 if (mTransitioningViews != null) { 5293 mTransitioningViews.remove(view); 5294 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5295 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5296 disappearingChildren.remove(view); 5297 if (mVisibilityChangingChildren != null && 5298 mVisibilityChangingChildren.contains(view)) { 5299 mVisibilityChangingChildren.remove(view); 5300 } else { 5301 if (view.mAttachInfo != null) { 5302 view.dispatchDetachedFromWindow(); 5303 } 5304 if (view.mParent != null) { 5305 view.mParent = null; 5306 } 5307 } 5308 invalidate(); 5309 } 5310 } 5311 } 5312 5313 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5314 new LayoutTransition.TransitionListener() { 5315 @Override 5316 public void startTransition(LayoutTransition transition, ViewGroup container, 5317 View view, int transitionType) { 5318 // We only care about disappearing items, since we need special logic to keep 5319 // those items visible after they've been 'removed' 5320 if (transitionType == LayoutTransition.DISAPPEARING) { 5321 startViewTransition(view); 5322 } 5323 } 5324 5325 @Override 5326 public void endTransition(LayoutTransition transition, ViewGroup container, 5327 View view, int transitionType) { 5328 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5329 requestLayout(); 5330 mLayoutCalledWhileSuppressed = false; 5331 } 5332 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5333 endViewTransition(view); 5334 } 5335 } 5336 }; 5337 5338 /** 5339 * Tells this ViewGroup to suppress all layout() calls until layout 5340 * suppression is disabled with a later call to suppressLayout(false). 5341 * When layout suppression is disabled, a requestLayout() call is sent 5342 * if layout() was attempted while layout was being suppressed. 5343 * 5344 * @hide 5345 */ 5346 public void suppressLayout(boolean suppress) { 5347 mSuppressLayout = suppress; 5348 if (!suppress) { 5349 if (mLayoutCalledWhileSuppressed) { 5350 requestLayout(); 5351 mLayoutCalledWhileSuppressed = false; 5352 } 5353 } 5354 } 5355 5356 /** 5357 * {@inheritDoc} 5358 */ 5359 @Override 5360 public boolean gatherTransparentRegion(Region region) { 5361 // If no transparent regions requested, we are always opaque. 5362 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5363 if (meOpaque && region == null) { 5364 // The caller doesn't care about the region, so stop now. 5365 return true; 5366 } 5367 super.gatherTransparentRegion(region); 5368 final View[] children = mChildren; 5369 final int count = mChildrenCount; 5370 boolean noneOfTheChildrenAreTransparent = true; 5371 for (int i = 0; i < count; i++) { 5372 final View child = children[i]; 5373 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5374 if (!child.gatherTransparentRegion(region)) { 5375 noneOfTheChildrenAreTransparent = false; 5376 } 5377 } 5378 } 5379 return meOpaque || noneOfTheChildrenAreTransparent; 5380 } 5381 5382 /** 5383 * {@inheritDoc} 5384 */ 5385 public void requestTransparentRegion(View child) { 5386 if (child != null) { 5387 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5388 if (mParent != null) { 5389 mParent.requestTransparentRegion(this); 5390 } 5391 } 5392 } 5393 5394 5395 @Override 5396 protected boolean fitSystemWindows(Rect insets) { 5397 boolean done = super.fitSystemWindows(insets); 5398 if (!done) { 5399 final int count = mChildrenCount; 5400 final View[] children = mChildren; 5401 for (int i = 0; i < count; i++) { 5402 done = children[i].fitSystemWindows(insets); 5403 if (done) { 5404 break; 5405 } 5406 } 5407 } 5408 return done; 5409 } 5410 5411 /** 5412 * Returns the animation listener to which layout animation events are 5413 * sent. 5414 * 5415 * @return an {@link android.view.animation.Animation.AnimationListener} 5416 */ 5417 public Animation.AnimationListener getLayoutAnimationListener() { 5418 return mAnimationListener; 5419 } 5420 5421 @Override 5422 protected void drawableStateChanged() { 5423 super.drawableStateChanged(); 5424 5425 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5426 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5427 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5428 + " child has duplicateParentState set to true"); 5429 } 5430 5431 final View[] children = mChildren; 5432 final int count = mChildrenCount; 5433 5434 for (int i = 0; i < count; i++) { 5435 final View child = children[i]; 5436 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5437 child.refreshDrawableState(); 5438 } 5439 } 5440 } 5441 } 5442 5443 @Override 5444 public void jumpDrawablesToCurrentState() { 5445 super.jumpDrawablesToCurrentState(); 5446 final View[] children = mChildren; 5447 final int count = mChildrenCount; 5448 for (int i = 0; i < count; i++) { 5449 children[i].jumpDrawablesToCurrentState(); 5450 } 5451 } 5452 5453 @Override 5454 protected int[] onCreateDrawableState(int extraSpace) { 5455 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5456 return super.onCreateDrawableState(extraSpace); 5457 } 5458 5459 int need = 0; 5460 int n = getChildCount(); 5461 for (int i = 0; i < n; i++) { 5462 int[] childState = getChildAt(i).getDrawableState(); 5463 5464 if (childState != null) { 5465 need += childState.length; 5466 } 5467 } 5468 5469 int[] state = super.onCreateDrawableState(extraSpace + need); 5470 5471 for (int i = 0; i < n; i++) { 5472 int[] childState = getChildAt(i).getDrawableState(); 5473 5474 if (childState != null) { 5475 state = mergeDrawableStates(state, childState); 5476 } 5477 } 5478 5479 return state; 5480 } 5481 5482 /** 5483 * Sets whether this ViewGroup's drawable states also include 5484 * its children's drawable states. This is used, for example, to 5485 * make a group appear to be focused when its child EditText or button 5486 * is focused. 5487 */ 5488 public void setAddStatesFromChildren(boolean addsStates) { 5489 if (addsStates) { 5490 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5491 } else { 5492 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5493 } 5494 5495 refreshDrawableState(); 5496 } 5497 5498 /** 5499 * Returns whether this ViewGroup's drawable states also include 5500 * its children's drawable states. This is used, for example, to 5501 * make a group appear to be focused when its child EditText or button 5502 * is focused. 5503 */ 5504 public boolean addStatesFromChildren() { 5505 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5506 } 5507 5508 /** 5509 * If {@link #addStatesFromChildren} is true, refreshes this group's 5510 * drawable state (to include the states from its children). 5511 */ 5512 public void childDrawableStateChanged(View child) { 5513 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5514 refreshDrawableState(); 5515 } 5516 } 5517 5518 /** 5519 * Specifies the animation listener to which layout animation events must 5520 * be sent. Only 5521 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5522 * and 5523 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5524 * are invoked. 5525 * 5526 * @param animationListener the layout animation listener 5527 */ 5528 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5529 mAnimationListener = animationListener; 5530 } 5531 5532 /** 5533 * This method is called by LayoutTransition when there are 'changing' animations that need 5534 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5535 * starts all pending transitions prior to the drawing phase in the current traversal. 5536 * 5537 * @param transition The LayoutTransition to be started on the next traversal. 5538 * 5539 * @hide 5540 */ 5541 public void requestTransitionStart(LayoutTransition transition) { 5542 ViewRootImpl viewAncestor = getViewRootImpl(); 5543 if (viewAncestor != null) { 5544 viewAncestor.requestTransitionStart(transition); 5545 } 5546 } 5547 5548 /** 5549 * @hide 5550 */ 5551 @Override 5552 public boolean resolveRtlPropertiesIfNeeded() { 5553 final boolean result = super.resolveRtlPropertiesIfNeeded(); 5554 // We dont need to resolve the children RTL properties if nothing has changed for the parent 5555 if (result) { 5556 int count = getChildCount(); 5557 for (int i = 0; i < count; i++) { 5558 final View child = getChildAt(i); 5559 if (child.isLayoutDirectionInherited()) { 5560 child.resolveRtlPropertiesIfNeeded(); 5561 } 5562 } 5563 } 5564 return result; 5565 } 5566 5567 /** 5568 * @hide 5569 */ 5570 @Override 5571 public boolean resolveLayoutDirection() { 5572 final boolean result = super.resolveLayoutDirection(); 5573 if (result) { 5574 int count = getChildCount(); 5575 for (int i = 0; i < count; i++) { 5576 final View child = getChildAt(i); 5577 if (child.isLayoutDirectionInherited()) { 5578 child.resolveLayoutDirection(); 5579 } 5580 } 5581 } 5582 return result; 5583 } 5584 5585 /** 5586 * @hide 5587 */ 5588 @Override 5589 public boolean resolveTextDirection() { 5590 final boolean result = super.resolveTextDirection(); 5591 if (result) { 5592 int count = getChildCount(); 5593 for (int i = 0; i < count; i++) { 5594 final View child = getChildAt(i); 5595 if (child.isTextDirectionInherited()) { 5596 child.resolveTextDirection(); 5597 } 5598 } 5599 } 5600 return result; 5601 } 5602 5603 /** 5604 * @hide 5605 */ 5606 @Override 5607 public boolean resolveTextAlignment() { 5608 final boolean result = super.resolveTextAlignment(); 5609 if (result) { 5610 int count = getChildCount(); 5611 for (int i = 0; i < count; i++) { 5612 final View child = getChildAt(i); 5613 if (child.isTextAlignmentInherited()) { 5614 child.resolveTextAlignment(); 5615 } 5616 } 5617 } 5618 return result; 5619 } 5620 5621 /** 5622 * @hide 5623 */ 5624 @Override 5625 public void resolvePadding() { 5626 super.resolvePadding(); 5627 int count = getChildCount(); 5628 for (int i = 0; i < count; i++) { 5629 final View child = getChildAt(i); 5630 if (child.isLayoutDirectionInherited()) { 5631 child.resolvePadding(); 5632 } 5633 } 5634 } 5635 5636 /** 5637 * @hide 5638 */ 5639 @Override 5640 protected void resolveDrawables() { 5641 super.resolveDrawables(); 5642 int count = getChildCount(); 5643 for (int i = 0; i < count; i++) { 5644 final View child = getChildAt(i); 5645 if (child.isLayoutDirectionInherited()) { 5646 child.resolveDrawables(); 5647 } 5648 } 5649 } 5650 5651 /** 5652 * @hide 5653 */ 5654 @Override 5655 public void resolveLayoutParams() { 5656 super.resolveLayoutParams(); 5657 int count = getChildCount(); 5658 for (int i = 0; i < count; i++) { 5659 final View child = getChildAt(i); 5660 child.resolveLayoutParams(); 5661 } 5662 } 5663 5664 /** 5665 * @hide 5666 */ 5667 @Override 5668 public void resetResolvedLayoutDirection() { 5669 super.resetResolvedLayoutDirection(); 5670 5671 int count = getChildCount(); 5672 for (int i = 0; i < count; i++) { 5673 final View child = getChildAt(i); 5674 if (child.isLayoutDirectionInherited()) { 5675 child.resetResolvedLayoutDirection(); 5676 } 5677 } 5678 } 5679 5680 /** 5681 * @hide 5682 */ 5683 @Override 5684 public void resetResolvedTextDirection() { 5685 super.resetResolvedTextDirection(); 5686 5687 int count = getChildCount(); 5688 for (int i = 0; i < count; i++) { 5689 final View child = getChildAt(i); 5690 if (child.isTextDirectionInherited()) { 5691 child.resetResolvedTextDirection(); 5692 } 5693 } 5694 } 5695 5696 /** 5697 * @hide 5698 */ 5699 @Override 5700 public void resetResolvedTextAlignment() { 5701 super.resetResolvedTextAlignment(); 5702 5703 int count = getChildCount(); 5704 for (int i = 0; i < count; i++) { 5705 final View child = getChildAt(i); 5706 if (child.isTextAlignmentInherited()) { 5707 child.resetResolvedTextAlignment(); 5708 } 5709 } 5710 } 5711 5712 /** 5713 * @hide 5714 */ 5715 @Override 5716 public void resetResolvedPadding() { 5717 super.resetResolvedPadding(); 5718 5719 int count = getChildCount(); 5720 for (int i = 0; i < count; i++) { 5721 final View child = getChildAt(i); 5722 if (child.isLayoutDirectionInherited()) { 5723 child.resetResolvedPadding(); 5724 } 5725 } 5726 } 5727 5728 /** 5729 * @hide 5730 */ 5731 @Override 5732 protected void resetResolvedDrawables() { 5733 super.resetResolvedDrawables(); 5734 5735 int count = getChildCount(); 5736 for (int i = 0; i < count; i++) { 5737 final View child = getChildAt(i); 5738 if (child.isLayoutDirectionInherited()) { 5739 child.resetResolvedDrawables(); 5740 } 5741 } 5742 } 5743 5744 /** 5745 * Return true if the pressed state should be delayed for children or descendants of this 5746 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5747 * This prevents the pressed state from appearing when the user is actually trying to scroll 5748 * the content. 5749 * 5750 * The default implementation returns true for compatibility reasons. Subclasses that do 5751 * not scroll should generally override this method and return false. 5752 */ 5753 public boolean shouldDelayChildPressedState() { 5754 return true; 5755 } 5756 5757 /** @hide */ 5758 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5759 } 5760 5761 /** 5762 * LayoutParams are used by views to tell their parents how they want to be 5763 * laid out. See 5764 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5765 * for a list of all child view attributes that this class supports. 5766 * 5767 * <p> 5768 * The base LayoutParams class just describes how big the view wants to be 5769 * for both width and height. For each dimension, it can specify one of: 5770 * <ul> 5771 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5772 * means that the view wants to be as big as its parent (minus padding) 5773 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5774 * to enclose its content (plus padding) 5775 * <li> an exact number 5776 * </ul> 5777 * There are subclasses of LayoutParams for different subclasses of 5778 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5779 * LayoutParams which adds an X and Y value.</p> 5780 * 5781 * <div class="special reference"> 5782 * <h3>Developer Guides</h3> 5783 * <p>For more information about creating user interface layouts, read the 5784 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5785 * guide.</p></div> 5786 * 5787 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5788 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5789 */ 5790 public static class LayoutParams { 5791 /** 5792 * Special value for the height or width requested by a View. 5793 * FILL_PARENT means that the view wants to be as big as its parent, 5794 * minus the parent's padding, if any. This value is deprecated 5795 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5796 */ 5797 @SuppressWarnings({"UnusedDeclaration"}) 5798 @Deprecated 5799 public static final int FILL_PARENT = -1; 5800 5801 /** 5802 * Special value for the height or width requested by a View. 5803 * MATCH_PARENT means that the view wants to be as big as its parent, 5804 * minus the parent's padding, if any. Introduced in API Level 8. 5805 */ 5806 public static final int MATCH_PARENT = -1; 5807 5808 /** 5809 * Special value for the height or width requested by a View. 5810 * WRAP_CONTENT means that the view wants to be just large enough to fit 5811 * its own internal content, taking its own padding into account. 5812 */ 5813 public static final int WRAP_CONTENT = -2; 5814 5815 /** 5816 * Information about how wide the view wants to be. Can be one of the 5817 * constants FILL_PARENT (replaced by MATCH_PARENT , 5818 * in API Level 8) or WRAP_CONTENT. or an exact size. 5819 */ 5820 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5821 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5822 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5823 }) 5824 public int width; 5825 5826 /** 5827 * Information about how tall the view wants to be. Can be one of the 5828 * constants FILL_PARENT (replaced by MATCH_PARENT , 5829 * in API Level 8) or WRAP_CONTENT. or an exact size. 5830 */ 5831 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5832 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5833 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5834 }) 5835 public int height; 5836 5837 /** 5838 * Used to animate layouts. 5839 */ 5840 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5841 5842 /** 5843 * Creates a new set of layout parameters. The values are extracted from 5844 * the supplied attributes set and context. The XML attributes mapped 5845 * to this set of layout parameters are: 5846 * 5847 * <ul> 5848 * <li><code>layout_width</code>: the width, either an exact value, 5849 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5850 * {@link #MATCH_PARENT} in API Level 8)</li> 5851 * <li><code>layout_height</code>: the height, either an exact value, 5852 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5853 * {@link #MATCH_PARENT} in API Level 8)</li> 5854 * </ul> 5855 * 5856 * @param c the application environment 5857 * @param attrs the set of attributes from which to extract the layout 5858 * parameters' values 5859 */ 5860 public LayoutParams(Context c, AttributeSet attrs) { 5861 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5862 setBaseAttributes(a, 5863 R.styleable.ViewGroup_Layout_layout_width, 5864 R.styleable.ViewGroup_Layout_layout_height); 5865 a.recycle(); 5866 } 5867 5868 /** 5869 * Creates a new set of layout parameters with the specified width 5870 * and height. 5871 * 5872 * @param width the width, either {@link #WRAP_CONTENT}, 5873 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5874 * API Level 8), or a fixed size in pixels 5875 * @param height the height, either {@link #WRAP_CONTENT}, 5876 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5877 * API Level 8), or a fixed size in pixels 5878 */ 5879 public LayoutParams(int width, int height) { 5880 this.width = width; 5881 this.height = height; 5882 } 5883 5884 /** 5885 * Copy constructor. Clones the width and height values of the source. 5886 * 5887 * @param source The layout params to copy from. 5888 */ 5889 public LayoutParams(LayoutParams source) { 5890 this.width = source.width; 5891 this.height = source.height; 5892 } 5893 5894 /** 5895 * Used internally by MarginLayoutParams. 5896 * @hide 5897 */ 5898 LayoutParams() { 5899 } 5900 5901 /** 5902 * Extracts the layout parameters from the supplied attributes. 5903 * 5904 * @param a the style attributes to extract the parameters from 5905 * @param widthAttr the identifier of the width attribute 5906 * @param heightAttr the identifier of the height attribute 5907 */ 5908 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5909 width = a.getLayoutDimension(widthAttr, "layout_width"); 5910 height = a.getLayoutDimension(heightAttr, "layout_height"); 5911 } 5912 5913 /** 5914 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5915 * layoutDirection changes should override this method. The default implementation does 5916 * nothing. 5917 * 5918 * @param layoutDirection the direction of the layout 5919 * 5920 * {@link View#LAYOUT_DIRECTION_LTR} 5921 * {@link View#LAYOUT_DIRECTION_RTL} 5922 */ 5923 public void resolveLayoutDirection(int layoutDirection) { 5924 } 5925 5926 /** 5927 * Returns a String representation of this set of layout parameters. 5928 * 5929 * @param output the String to prepend to the internal representation 5930 * @return a String with the following format: output + 5931 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5932 * 5933 * @hide 5934 */ 5935 public String debug(String output) { 5936 return output + "ViewGroup.LayoutParams={ width=" 5937 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5938 } 5939 5940 /** 5941 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5942 * 5943 * @param view the view that contains these layout parameters 5944 * @param canvas the canvas on which to draw 5945 * 5946 * @hide 5947 */ 5948 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5949 } 5950 5951 /** 5952 * Converts the specified size to a readable String. 5953 * 5954 * @param size the size to convert 5955 * @return a String instance representing the supplied size 5956 * 5957 * @hide 5958 */ 5959 protected static String sizeToString(int size) { 5960 if (size == WRAP_CONTENT) { 5961 return "wrap-content"; 5962 } 5963 if (size == MATCH_PARENT) { 5964 return "match-parent"; 5965 } 5966 return String.valueOf(size); 5967 } 5968 } 5969 5970 /** 5971 * Per-child layout information for layouts that support margins. 5972 * See 5973 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5974 * for a list of all child view attributes that this class supports. 5975 */ 5976 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5977 /** 5978 * The left margin in pixels of the child. 5979 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5980 * to this field. 5981 */ 5982 @ViewDebug.ExportedProperty(category = "layout") 5983 public int leftMargin; 5984 5985 /** 5986 * The top margin in pixels of the child. 5987 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5988 * to this field. 5989 */ 5990 @ViewDebug.ExportedProperty(category = "layout") 5991 public int topMargin; 5992 5993 /** 5994 * The right margin in pixels of the child. 5995 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5996 * to this field. 5997 */ 5998 @ViewDebug.ExportedProperty(category = "layout") 5999 public int rightMargin; 6000 6001 /** 6002 * The bottom margin in pixels of the child. 6003 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6004 * to this field. 6005 */ 6006 @ViewDebug.ExportedProperty(category = "layout") 6007 public int bottomMargin; 6008 6009 /** 6010 * The start margin in pixels of the child. 6011 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6012 * to this field. 6013 */ 6014 @ViewDebug.ExportedProperty(category = "layout") 6015 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6016 6017 /** 6018 * The end margin in pixels of the child. 6019 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6020 * to this field. 6021 */ 6022 @ViewDebug.ExportedProperty(category = "layout") 6023 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6024 6025 /** 6026 * The default start and end margin. 6027 * @hide 6028 */ 6029 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6030 6031 /** 6032 * Bit 0: layout direction 6033 * Bit 1: layout direction 6034 * Bit 2: left margin undefined 6035 * Bit 3: right margin undefined 6036 * Bit 4: is RTL compatibility mode 6037 * Bit 5: need resolution 6038 * 6039 * Bit 6 to 7 not used 6040 * 6041 * @hide 6042 */ 6043 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6044 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6045 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6046 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6047 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6048 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6049 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6050 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6051 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6052 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6053 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6054 }) 6055 byte mMarginFlags; 6056 6057 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6058 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6059 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6060 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6061 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6062 6063 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6064 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6065 6066 /** 6067 * Creates a new set of layout parameters. The values are extracted from 6068 * the supplied attributes set and context. 6069 * 6070 * @param c the application environment 6071 * @param attrs the set of attributes from which to extract the layout 6072 * parameters' values 6073 */ 6074 public MarginLayoutParams(Context c, AttributeSet attrs) { 6075 super(); 6076 6077 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6078 setBaseAttributes(a, 6079 R.styleable.ViewGroup_MarginLayout_layout_width, 6080 R.styleable.ViewGroup_MarginLayout_layout_height); 6081 6082 int margin = a.getDimensionPixelSize( 6083 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6084 if (margin >= 0) { 6085 leftMargin = margin; 6086 topMargin = margin; 6087 rightMargin= margin; 6088 bottomMargin = margin; 6089 } else { 6090 leftMargin = a.getDimensionPixelSize( 6091 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6092 UNDEFINED_MARGIN); 6093 if (leftMargin == UNDEFINED_MARGIN) { 6094 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6095 leftMargin = DEFAULT_MARGIN_RESOLVED; 6096 } 6097 rightMargin = a.getDimensionPixelSize( 6098 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6099 UNDEFINED_MARGIN); 6100 if (rightMargin == UNDEFINED_MARGIN) { 6101 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6102 rightMargin = DEFAULT_MARGIN_RESOLVED; 6103 } 6104 6105 topMargin = a.getDimensionPixelSize( 6106 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6107 DEFAULT_MARGIN_RESOLVED); 6108 bottomMargin = a.getDimensionPixelSize( 6109 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6110 DEFAULT_MARGIN_RESOLVED); 6111 6112 startMargin = a.getDimensionPixelSize( 6113 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6114 DEFAULT_MARGIN_RELATIVE); 6115 endMargin = a.getDimensionPixelSize( 6116 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6117 DEFAULT_MARGIN_RELATIVE); 6118 6119 if (isMarginRelative()) { 6120 mMarginFlags |= NEED_RESOLUTION_MASK; 6121 } 6122 } 6123 6124 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6125 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6126 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6127 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6128 } 6129 6130 // Layout direction is LTR by default 6131 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6132 6133 a.recycle(); 6134 } 6135 6136 /** 6137 * {@inheritDoc} 6138 */ 6139 public MarginLayoutParams(int width, int height) { 6140 super(width, height); 6141 6142 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6143 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6144 6145 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6146 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6147 } 6148 6149 /** 6150 * Copy constructor. Clones the width, height and margin values of the source. 6151 * 6152 * @param source The layout params to copy from. 6153 */ 6154 public MarginLayoutParams(MarginLayoutParams source) { 6155 this.width = source.width; 6156 this.height = source.height; 6157 6158 this.leftMargin = source.leftMargin; 6159 this.topMargin = source.topMargin; 6160 this.rightMargin = source.rightMargin; 6161 this.bottomMargin = source.bottomMargin; 6162 this.startMargin = source.startMargin; 6163 this.endMargin = source.endMargin; 6164 6165 this.mMarginFlags = source.mMarginFlags; 6166 } 6167 6168 /** 6169 * {@inheritDoc} 6170 */ 6171 public MarginLayoutParams(LayoutParams source) { 6172 super(source); 6173 6174 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6175 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6176 6177 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6178 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6179 } 6180 6181 /** 6182 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6183 * to be done so that the new margins are taken into account. Left and right margins may be 6184 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6185 * 6186 * @param left the left margin size 6187 * @param top the top margin size 6188 * @param right the right margin size 6189 * @param bottom the bottom margin size 6190 * 6191 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6192 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6193 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6194 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6195 */ 6196 public void setMargins(int left, int top, int right, int bottom) { 6197 leftMargin = left; 6198 topMargin = top; 6199 rightMargin = right; 6200 bottomMargin = bottom; 6201 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6202 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6203 if (isMarginRelative()) { 6204 mMarginFlags |= NEED_RESOLUTION_MASK; 6205 } else { 6206 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6207 } 6208 } 6209 6210 /** 6211 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6212 * needs to be done so that the new relative margins are taken into account. Left and right 6213 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6214 * direction. 6215 * 6216 * @param start the start margin size 6217 * @param top the top margin size 6218 * @param end the right margin size 6219 * @param bottom the bottom margin size 6220 * 6221 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6222 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6223 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6224 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6225 * 6226 * @hide 6227 */ 6228 public void setMarginsRelative(int start, int top, int end, int bottom) { 6229 startMargin = start; 6230 topMargin = top; 6231 endMargin = end; 6232 bottomMargin = bottom; 6233 mMarginFlags |= NEED_RESOLUTION_MASK; 6234 } 6235 6236 /** 6237 * Sets the relative start margin. 6238 * 6239 * @param start the start margin size 6240 * 6241 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6242 */ 6243 public void setMarginStart(int start) { 6244 startMargin = start; 6245 mMarginFlags |= NEED_RESOLUTION_MASK; 6246 } 6247 6248 /** 6249 * Returns the start margin in pixels. 6250 * 6251 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6252 * 6253 * @return the start margin in pixels. 6254 */ 6255 public int getMarginStart() { 6256 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6257 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6258 doResolveMargins(); 6259 } 6260 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6261 case View.LAYOUT_DIRECTION_RTL: 6262 return rightMargin; 6263 case View.LAYOUT_DIRECTION_LTR: 6264 default: 6265 return leftMargin; 6266 } 6267 } 6268 6269 /** 6270 * Sets the relative end margin. 6271 * 6272 * @param end the end margin size 6273 * 6274 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6275 */ 6276 public void setMarginEnd(int end) { 6277 endMargin = end; 6278 mMarginFlags |= NEED_RESOLUTION_MASK; 6279 } 6280 6281 /** 6282 * Returns the end margin in pixels. 6283 * 6284 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6285 * 6286 * @return the end margin in pixels. 6287 */ 6288 public int getMarginEnd() { 6289 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6290 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6291 doResolveMargins(); 6292 } 6293 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6294 case View.LAYOUT_DIRECTION_RTL: 6295 return leftMargin; 6296 case View.LAYOUT_DIRECTION_LTR: 6297 default: 6298 return rightMargin; 6299 } 6300 } 6301 6302 /** 6303 * Check if margins are relative. 6304 * 6305 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6306 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6307 * 6308 * @return true if either marginStart or marginEnd has been set. 6309 */ 6310 public boolean isMarginRelative() { 6311 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6312 } 6313 6314 /** 6315 * Set the layout direction 6316 * @param layoutDirection the layout direction. 6317 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6318 * or {@link View#LAYOUT_DIRECTION_RTL}. 6319 */ 6320 public void setLayoutDirection(int layoutDirection) { 6321 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6322 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6323 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6324 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6325 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6326 if (isMarginRelative()) { 6327 mMarginFlags |= NEED_RESOLUTION_MASK; 6328 } else { 6329 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6330 } 6331 } 6332 } 6333 6334 /** 6335 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6336 * {@link View#LAYOUT_DIRECTION_RTL}. 6337 * 6338 * @return the layout direction. 6339 */ 6340 public int getLayoutDirection() { 6341 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6342 } 6343 6344 /** 6345 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6346 * may be overridden depending on layout direction. 6347 */ 6348 @Override 6349 public void resolveLayoutDirection(int layoutDirection) { 6350 setLayoutDirection(layoutDirection); 6351 6352 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6353 // Will use the left and right margins if no relative margin is defined. 6354 if (!isMarginRelative() || 6355 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6356 6357 // Proceed with resolution 6358 doResolveMargins(); 6359 } 6360 6361 private void doResolveMargins() { 6362 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 6363 // if left or right margins are not defined and if we have some start or end margin 6364 // defined then use those start and end margins. 6365 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 6366 && startMargin > DEFAULT_MARGIN_RELATIVE) { 6367 leftMargin = startMargin; 6368 } 6369 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 6370 && endMargin > DEFAULT_MARGIN_RELATIVE) { 6371 rightMargin = endMargin; 6372 } 6373 } else { 6374 // We have some relative margins (either the start one or the end one or both). So use 6375 // them and override what has been defined for left and right margins. If either start 6376 // or end margin is not defined, just set it to default "0". 6377 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6378 case View.LAYOUT_DIRECTION_RTL: 6379 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6380 endMargin : DEFAULT_MARGIN_RESOLVED; 6381 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6382 startMargin : DEFAULT_MARGIN_RESOLVED; 6383 break; 6384 case View.LAYOUT_DIRECTION_LTR: 6385 default: 6386 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6387 startMargin : DEFAULT_MARGIN_RESOLVED; 6388 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6389 endMargin : DEFAULT_MARGIN_RESOLVED; 6390 break; 6391 } 6392 } 6393 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6394 } 6395 6396 /** 6397 * @hide 6398 */ 6399 public boolean isLayoutRtl() { 6400 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 6401 } 6402 6403 /** 6404 * @hide 6405 */ 6406 @Override 6407 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6408 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6409 6410 fillDifference(canvas, 6411 view.getLeft() + oi.left, 6412 view.getTop() + oi.top, 6413 view.getRight() - oi.right, 6414 view.getBottom() - oi.bottom, 6415 leftMargin, 6416 topMargin, 6417 rightMargin, 6418 bottomMargin, 6419 paint); 6420 } 6421 } 6422 6423 /* Describes a touched view and the ids of the pointers that it has captured. 6424 * 6425 * This code assumes that pointer ids are always in the range 0..31 such that 6426 * it can use a bitfield to track which pointer ids are present. 6427 * As it happens, the lower layers of the input dispatch pipeline also use the 6428 * same trick so the assumption should be safe here... 6429 */ 6430 private static final class TouchTarget { 6431 private static final int MAX_RECYCLED = 32; 6432 private static final Object sRecycleLock = new Object[0]; 6433 private static TouchTarget sRecycleBin; 6434 private static int sRecycledCount; 6435 6436 public static final int ALL_POINTER_IDS = -1; // all ones 6437 6438 // The touched child view. 6439 public View child; 6440 6441 // The combined bit mask of pointer ids for all pointers captured by the target. 6442 public int pointerIdBits; 6443 6444 // The next target in the target list. 6445 public TouchTarget next; 6446 6447 private TouchTarget() { 6448 } 6449 6450 public static TouchTarget obtain(View child, int pointerIdBits) { 6451 final TouchTarget target; 6452 synchronized (sRecycleLock) { 6453 if (sRecycleBin == null) { 6454 target = new TouchTarget(); 6455 } else { 6456 target = sRecycleBin; 6457 sRecycleBin = target.next; 6458 sRecycledCount--; 6459 target.next = null; 6460 } 6461 } 6462 target.child = child; 6463 target.pointerIdBits = pointerIdBits; 6464 return target; 6465 } 6466 6467 public void recycle() { 6468 synchronized (sRecycleLock) { 6469 if (sRecycledCount < MAX_RECYCLED) { 6470 next = sRecycleBin; 6471 sRecycleBin = this; 6472 sRecycledCount += 1; 6473 } else { 6474 next = null; 6475 } 6476 child = null; 6477 } 6478 } 6479 } 6480 6481 /* Describes a hovered view. */ 6482 private static final class HoverTarget { 6483 private static final int MAX_RECYCLED = 32; 6484 private static final Object sRecycleLock = new Object[0]; 6485 private static HoverTarget sRecycleBin; 6486 private static int sRecycledCount; 6487 6488 // The hovered child view. 6489 public View child; 6490 6491 // The next target in the target list. 6492 public HoverTarget next; 6493 6494 private HoverTarget() { 6495 } 6496 6497 public static HoverTarget obtain(View child) { 6498 final HoverTarget target; 6499 synchronized (sRecycleLock) { 6500 if (sRecycleBin == null) { 6501 target = new HoverTarget(); 6502 } else { 6503 target = sRecycleBin; 6504 sRecycleBin = target.next; 6505 sRecycledCount--; 6506 target.next = null; 6507 } 6508 } 6509 target.child = child; 6510 return target; 6511 } 6512 6513 public void recycle() { 6514 synchronized (sRecycleLock) { 6515 if (sRecycledCount < MAX_RECYCLED) { 6516 next = sRecycleBin; 6517 sRecycleBin = this; 6518 sRecycledCount += 1; 6519 } else { 6520 next = null; 6521 } 6522 child = null; 6523 } 6524 } 6525 } 6526 6527 /** 6528 * Pooled class that orderes the children of a ViewGroup from start 6529 * to end based on how they are laid out and the layout direction. 6530 */ 6531 static class ChildListForAccessibility { 6532 6533 private static final int MAX_POOL_SIZE = 32; 6534 6535 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6536 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6537 6538 private final ArrayList<View> mChildren = new ArrayList<View>(); 6539 6540 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6541 6542 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6543 ChildListForAccessibility list = sPool.acquire(); 6544 if (list == null) { 6545 list = new ChildListForAccessibility(); 6546 } 6547 list.init(parent, sort); 6548 return list; 6549 } 6550 6551 public void recycle() { 6552 clear(); 6553 sPool.release(this); 6554 } 6555 6556 public int getChildCount() { 6557 return mChildren.size(); 6558 } 6559 6560 public View getChildAt(int index) { 6561 return mChildren.get(index); 6562 } 6563 6564 public int getChildIndex(View child) { 6565 return mChildren.indexOf(child); 6566 } 6567 6568 private void init(ViewGroup parent, boolean sort) { 6569 ArrayList<View> children = mChildren; 6570 final int childCount = parent.getChildCount(); 6571 for (int i = 0; i < childCount; i++) { 6572 View child = parent.getChildAt(i); 6573 children.add(child); 6574 } 6575 if (sort) { 6576 ArrayList<ViewLocationHolder> holders = mHolders; 6577 for (int i = 0; i < childCount; i++) { 6578 View child = children.get(i); 6579 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6580 holders.add(holder); 6581 } 6582 Collections.sort(holders); 6583 for (int i = 0; i < childCount; i++) { 6584 ViewLocationHolder holder = holders.get(i); 6585 children.set(i, holder.mView); 6586 holder.recycle(); 6587 } 6588 holders.clear(); 6589 } 6590 } 6591 6592 private void clear() { 6593 mChildren.clear(); 6594 } 6595 } 6596 6597 /** 6598 * Pooled class that holds a View and its location with respect to 6599 * a specified root. This enables sorting of views based on their 6600 * coordinates without recomputing the position relative to the root 6601 * on every comparison. 6602 */ 6603 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6604 6605 private static final int MAX_POOL_SIZE = 32; 6606 6607 private static final SynchronizedPool<ViewLocationHolder> sPool = 6608 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6609 6610 private final Rect mLocation = new Rect(); 6611 6612 public View mView; 6613 6614 private int mLayoutDirection; 6615 6616 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6617 ViewLocationHolder holder = sPool.acquire(); 6618 if (holder == null) { 6619 holder = new ViewLocationHolder(); 6620 } 6621 holder.init(root, view); 6622 return holder; 6623 } 6624 6625 public void recycle() { 6626 clear(); 6627 sPool.release(this); 6628 } 6629 6630 @Override 6631 public int compareTo(ViewLocationHolder another) { 6632 // This instance is greater than an invalid argument. 6633 if (another == null) { 6634 return 1; 6635 } 6636 if (getClass() != another.getClass()) { 6637 return 1; 6638 } 6639 // First is above second. 6640 if (mLocation.bottom - another.mLocation.top <= 0) { 6641 return -1; 6642 } 6643 // First is below second. 6644 if (mLocation.top - another.mLocation.bottom >= 0) { 6645 return 1; 6646 } 6647 // LTR 6648 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6649 final int leftDifference = mLocation.left - another.mLocation.left; 6650 // First more to the left than second. 6651 if (leftDifference != 0) { 6652 return leftDifference; 6653 } 6654 } else { // RTL 6655 final int rightDifference = mLocation.right - another.mLocation.right; 6656 // First more to the right than second. 6657 if (rightDifference != 0) { 6658 return -rightDifference; 6659 } 6660 } 6661 // Break tie by top. 6662 final int topDiference = mLocation.top - another.mLocation.top; 6663 if (topDiference != 0) { 6664 return topDiference; 6665 } 6666 // Break tie by height. 6667 final int heightDiference = mLocation.height() - another.mLocation.height(); 6668 if (heightDiference != 0) { 6669 return -heightDiference; 6670 } 6671 // Break tie by width. 6672 final int widthDiference = mLocation.width() - another.mLocation.width(); 6673 if (widthDiference != 0) { 6674 return -widthDiference; 6675 } 6676 // Just break the tie somehow. The accessibliity ids are unique 6677 // and stable, hence this is deterministic tie breaking. 6678 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6679 } 6680 6681 private void init(ViewGroup root, View view) { 6682 Rect viewLocation = mLocation; 6683 view.getDrawingRect(viewLocation); 6684 root.offsetDescendantRectToMyCoords(view, viewLocation); 6685 mView = view; 6686 mLayoutDirection = root.getLayoutDirection(); 6687 } 6688 6689 private void clear() { 6690 mView = null; 6691 mLocation.set(0, 0, 0, 0); 6692 } 6693 } 6694 6695 private static Paint getDebugPaint() { 6696 if (sDebugPaint == null) { 6697 sDebugPaint = new Paint(); 6698 sDebugPaint.setAntiAlias(false); 6699 } 6700 return sDebugPaint; 6701 } 6702 6703 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6704 if (sDebugLines== null) { 6705 // TODO: This won't work with multiple UI threads in a single process 6706 sDebugLines = new float[16]; 6707 } 6708 6709 sDebugLines[0] = x1; 6710 sDebugLines[1] = y1; 6711 sDebugLines[2] = x2; 6712 sDebugLines[3] = y1; 6713 6714 sDebugLines[4] = x2; 6715 sDebugLines[5] = y1; 6716 sDebugLines[6] = x2; 6717 sDebugLines[7] = y2; 6718 6719 sDebugLines[8] = x2; 6720 sDebugLines[9] = y2; 6721 sDebugLines[10] = x1; 6722 sDebugLines[11] = y2; 6723 6724 sDebugLines[12] = x1; 6725 sDebugLines[13] = y2; 6726 sDebugLines[14] = x1; 6727 sDebugLines[15] = y1; 6728 6729 canvas.drawLines(sDebugLines, paint); 6730 } 6731} 6732