ViewGroup.java revision 6254f4806dd3db53b7380e77fbb183065685573e
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.Pools.SynchronizedPool; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.accessibility.AccessibilityNodeInfo; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import com.android.internal.R; 48import com.android.internal.util.Predicate; 49 50import java.util.ArrayList; 51import java.util.Collections; 52import java.util.HashSet; 53 54import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 55 56/** 57 * <p> 58 * A <code>ViewGroup</code> is a special view that can contain other views 59 * (called children.) The view group is the base class for layouts and views 60 * containers. This class also defines the 61 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 62 * class for layouts parameters. 63 * </p> 64 * 65 * <p> 66 * Also see {@link LayoutParams} for layout attributes. 67 * </p> 68 * 69 * <div class="special reference"> 70 * <h3>Developer Guides</h3> 71 * <p>For more information about creating user interface layouts, read the 72 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 73 * guide.</p></div> 74 * 75 * <p>Here is a complete implementation of a custom ViewGroup that implements 76 * a simple {@link android.widget.FrameLayout} along with the ability to stack 77 * children in left and right gutters.</p> 78 * 79 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 80 * Complete} 81 * 82 * <p>If you are implementing XML layout attributes as shown in the example, this is the 83 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 84 * 85 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 86 * 87 * <p>Finally the layout manager can be used in an XML layout like so:</p> 88 * 89 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 90 * 91 * @attr ref android.R.styleable#ViewGroup_clipChildren 92 * @attr ref android.R.styleable#ViewGroup_clipToPadding 93 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 94 * @attr ref android.R.styleable#ViewGroup_animationCache 95 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 96 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 97 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 98 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 99 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 100 */ 101public abstract class ViewGroup extends View implements ViewParent, ViewManager { 102 private static final String TAG = "ViewGroup"; 103 104 private static final boolean DBG = false; 105 /** @hide */ 106 public static boolean DEBUG_DRAW = false; 107 108 /** 109 * Views which have been hidden or removed which need to be animated on 110 * their way out. 111 * This field should be made private, so it is hidden from the SDK. 112 * {@hide} 113 */ 114 protected ArrayList<View> mDisappearingChildren; 115 116 /** 117 * Listener used to propagate events indicating when children are added 118 * and/or removed from a view group. 119 * This field should be made private, so it is hidden from the SDK. 120 * {@hide} 121 */ 122 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 123 124 // The view contained within this ViewGroup that has or contains focus. 125 private View mFocused; 126 127 /** 128 * A Transformation used when drawing children, to 129 * apply on the child being drawn. 130 */ 131 final Transformation mChildTransformation = new Transformation(); 132 133 /** 134 * Used to track the current invalidation region. 135 */ 136 RectF mInvalidateRegion; 137 138 /** 139 * A Transformation used to calculate a correct 140 * invalidation area when the application is autoscaled. 141 */ 142 Transformation mInvalidationTransformation; 143 144 // View currently under an ongoing drag 145 private View mCurrentDragView; 146 147 // Metadata about the ongoing drag 148 private DragEvent mCurrentDrag; 149 private HashSet<View> mDragNotifiedChildren; 150 151 // Does this group have a child that can accept the current drag payload? 152 private boolean mChildAcceptsDrag; 153 154 // Used during drag dispatch 155 private final PointF mLocalPoint = new PointF(); 156 157 // Layout animation 158 private LayoutAnimationController mLayoutAnimationController; 159 private Animation.AnimationListener mAnimationListener; 160 161 // First touch target in the linked list of touch targets. 162 private TouchTarget mFirstTouchTarget; 163 164 // For debugging only. You can see these in hierarchyviewer. 165 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 166 @ViewDebug.ExportedProperty(category = "events") 167 private long mLastTouchDownTime; 168 @ViewDebug.ExportedProperty(category = "events") 169 private int mLastTouchDownIndex = -1; 170 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 171 @ViewDebug.ExportedProperty(category = "events") 172 private float mLastTouchDownX; 173 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 174 @ViewDebug.ExportedProperty(category = "events") 175 private float mLastTouchDownY; 176 177 // First hover target in the linked list of hover targets. 178 // The hover targets are children which have received ACTION_HOVER_ENTER. 179 // They might not have actually handled the hover event, but we will 180 // continue sending hover events to them as long as the pointer remains over 181 // their bounds and the view group does not intercept hover. 182 private HoverTarget mFirstHoverTarget; 183 184 // True if the view group itself received a hover event. 185 // It might not have actually handled the hover event. 186 private boolean mHoveredSelf; 187 188 /** 189 * Internal flags. 190 * 191 * This field should be made private, so it is hidden from the SDK. 192 * {@hide} 193 */ 194 @ViewDebug.ExportedProperty(flagMapping = { 195 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 196 name = "CLIP_CHILDREN"), 197 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 198 name = "CLIP_TO_PADDING"), 199 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 200 name = "PADDING_NOT_NULL") 201 }) 202 protected int mGroupFlags; 203 204 /** 205 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 206 */ 207 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 208 209 /** 210 * NOTE: If you change the flags below make sure to reflect the changes 211 * the DisplayList class 212 */ 213 214 // When set, ViewGroup invalidates only the child's rectangle 215 // Set by default 216 static final int FLAG_CLIP_CHILDREN = 0x1; 217 218 // When set, ViewGroup excludes the padding area from the invalidate rectangle 219 // Set by default 220 private static final int FLAG_CLIP_TO_PADDING = 0x2; 221 222 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 223 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 224 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 225 226 // When set, dispatchDraw() will run the layout animation and unset the flag 227 private static final int FLAG_RUN_ANIMATION = 0x8; 228 229 // When set, there is either no layout animation on the ViewGroup or the layout 230 // animation is over 231 // Set by default 232 static final int FLAG_ANIMATION_DONE = 0x10; 233 234 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 235 // to clip it, even if FLAG_CLIP_TO_PADDING is set 236 private static final int FLAG_PADDING_NOT_NULL = 0x20; 237 238 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 239 // Set by default 240 private static final int FLAG_ANIMATION_CACHE = 0x40; 241 242 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 243 // layout animation; this avoid clobbering the hierarchy 244 // Automatically set when the layout animation starts, depending on the animation's 245 // characteristics 246 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 247 248 // When set, the next call to drawChild() will clear mChildTransformation's matrix 249 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 250 251 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 252 // the children's Bitmap caches if necessary 253 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 254 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 255 256 /** 257 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 258 * to get the index of the child to draw for that iteration. 259 * 260 * @hide 261 */ 262 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 263 264 /** 265 * When set, this ViewGroup supports static transformations on children; this causes 266 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 267 * invoked when a child is drawn. 268 * 269 * Any subclass overriding 270 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 271 * set this flags in {@link #mGroupFlags}. 272 * 273 * {@hide} 274 */ 275 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 276 277 // When the previous drawChild() invocation used an alpha value that was lower than 278 // 1.0 and set it in mCachePaint 279 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 280 281 /** 282 * When set, this ViewGroup's drawable states also include those 283 * of its children. 284 */ 285 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 286 287 /** 288 * When set, this ViewGroup tries to always draw its children using their drawing cache. 289 */ 290 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 291 292 /** 293 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 294 * draw its children with their drawing cache. 295 */ 296 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 297 298 /** 299 * When set, this group will go through its list of children to notify them of 300 * any drawable state change. 301 */ 302 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 303 304 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 305 306 /** 307 * This view will get focus before any of its descendants. 308 */ 309 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 310 311 /** 312 * This view will get focus only if none of its descendants want it. 313 */ 314 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 315 316 /** 317 * This view will block any of its descendants from getting focus, even 318 * if they are focusable. 319 */ 320 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 321 322 /** 323 * Used to map between enum in attrubutes and flag values. 324 */ 325 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 326 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 327 FOCUS_BLOCK_DESCENDANTS}; 328 329 /** 330 * When set, this ViewGroup should not intercept touch events. 331 * {@hide} 332 */ 333 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 334 335 /** 336 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 337 */ 338 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 339 340 /** 341 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 342 * to children when adding new views. This is used to prevent multiple 343 * onAttached calls when a ViewGroup adds children in its own onAttached method. 344 */ 345 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 346 347 /** 348 * When true, indicates that a layoutMode has been explicitly set, either with 349 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 350 * This distinguishes the situation in which a layout mode was inherited from 351 * one of the ViewGroup's ancestors and cached locally. 352 */ 353 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 354 355 /** 356 * Indicates which types of drawing caches are to be kept in memory. 357 * This field should be made private, so it is hidden from the SDK. 358 * {@hide} 359 */ 360 protected int mPersistentDrawingCache; 361 362 /** 363 * Used to indicate that no drawing cache should be kept in memory. 364 */ 365 public static final int PERSISTENT_NO_CACHE = 0x0; 366 367 /** 368 * Used to indicate that the animation drawing cache should be kept in memory. 369 */ 370 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 371 372 /** 373 * Used to indicate that the scrolling drawing cache should be kept in memory. 374 */ 375 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 376 377 /** 378 * Used to indicate that all drawing caches should be kept in memory. 379 */ 380 public static final int PERSISTENT_ALL_CACHES = 0x3; 381 382 // Layout Modes 383 384 private static final int LAYOUT_MODE_UNDEFINED = -1; 385 386 /** 387 * This constant is a {@link #setLayoutMode(int) layoutMode}. 388 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 389 * {@link #getRight() right} and {@link #getBottom() bottom}. 390 */ 391 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 392 393 /** 394 * This constant is a {@link #setLayoutMode(int) layoutMode}. 395 * Optical bounds describe where a widget appears to be. They sit inside the clip 396 * bounds which need to cover a larger area to allow other effects, 397 * such as shadows and glows, to be drawn. 398 */ 399 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 400 401 /** @hide */ 402 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 403 404 /** 405 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 406 * are set at the same time. 407 */ 408 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 409 410 // Index of the child's left position in the mLocation array 411 private static final int CHILD_LEFT_INDEX = 0; 412 // Index of the child's top position in the mLocation array 413 private static final int CHILD_TOP_INDEX = 1; 414 415 // Child views of this ViewGroup 416 private View[] mChildren; 417 // Number of valid children in the mChildren array, the rest should be null or not 418 // considered as children 419 private int mChildrenCount; 420 421 // Whether layout calls are currently being suppressed, controlled by calls to 422 // suppressLayout() 423 boolean mSuppressLayout = false; 424 425 // Whether any layout calls have actually been suppressed while mSuppressLayout 426 // has been true. This tracks whether we need to issue a requestLayout() when 427 // layout is later re-enabled. 428 private boolean mLayoutCalledWhileSuppressed = false; 429 430 private static final int ARRAY_INITIAL_CAPACITY = 12; 431 private static final int ARRAY_CAPACITY_INCREMENT = 12; 432 433 private static Paint sDebugPaint; 434 private static float[] sDebugLines; 435 436 // Used to draw cached views 437 Paint mCachePaint; 438 439 // Used to animate add/remove changes in layout 440 private LayoutTransition mTransition; 441 442 // The set of views that are currently being transitioned. This list is used to track views 443 // being removed that should not actually be removed from the parent yet because they are 444 // being animated. 445 private ArrayList<View> mTransitioningViews; 446 447 // List of children changing visibility. This is used to potentially keep rendering 448 // views during a transition when they otherwise would have become gone/invisible 449 private ArrayList<View> mVisibilityChangingChildren; 450 451 // Indicates how many of this container's child subtrees contain transient state 452 @ViewDebug.ExportedProperty(category = "layout") 453 private int mChildCountWithTransientState = 0; 454 455 public ViewGroup(Context context) { 456 super(context); 457 initViewGroup(); 458 } 459 460 public ViewGroup(Context context, AttributeSet attrs) { 461 super(context, attrs); 462 initViewGroup(); 463 initFromAttributes(context, attrs); 464 } 465 466 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 467 super(context, attrs, defStyle); 468 initViewGroup(); 469 initFromAttributes(context, attrs); 470 } 471 472 private boolean debugDraw() { 473 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 474 } 475 476 private void initViewGroup() { 477 // ViewGroup doesn't draw by default 478 if (!debugDraw()) { 479 setFlags(WILL_NOT_DRAW, DRAW_MASK); 480 } 481 mGroupFlags |= FLAG_CLIP_CHILDREN; 482 mGroupFlags |= FLAG_CLIP_TO_PADDING; 483 mGroupFlags |= FLAG_ANIMATION_DONE; 484 mGroupFlags |= FLAG_ANIMATION_CACHE; 485 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 486 487 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 488 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 489 } 490 491 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 492 493 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 494 mChildrenCount = 0; 495 496 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 497 } 498 499 private void initFromAttributes(Context context, AttributeSet attrs) { 500 TypedArray a = context.obtainStyledAttributes(attrs, 501 R.styleable.ViewGroup); 502 503 final int N = a.getIndexCount(); 504 for (int i = 0; i < N; i++) { 505 int attr = a.getIndex(i); 506 switch (attr) { 507 case R.styleable.ViewGroup_clipChildren: 508 setClipChildren(a.getBoolean(attr, true)); 509 break; 510 case R.styleable.ViewGroup_clipToPadding: 511 setClipToPadding(a.getBoolean(attr, true)); 512 break; 513 case R.styleable.ViewGroup_animationCache: 514 setAnimationCacheEnabled(a.getBoolean(attr, true)); 515 break; 516 case R.styleable.ViewGroup_persistentDrawingCache: 517 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 518 break; 519 case R.styleable.ViewGroup_addStatesFromChildren: 520 setAddStatesFromChildren(a.getBoolean(attr, false)); 521 break; 522 case R.styleable.ViewGroup_alwaysDrawnWithCache: 523 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 524 break; 525 case R.styleable.ViewGroup_layoutAnimation: 526 int id = a.getResourceId(attr, -1); 527 if (id > 0) { 528 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 529 } 530 break; 531 case R.styleable.ViewGroup_descendantFocusability: 532 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 533 break; 534 case R.styleable.ViewGroup_splitMotionEvents: 535 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 536 break; 537 case R.styleable.ViewGroup_animateLayoutChanges: 538 boolean animateLayoutChanges = a.getBoolean(attr, false); 539 if (animateLayoutChanges) { 540 setLayoutTransition(new LayoutTransition()); 541 } 542 break; 543 case R.styleable.ViewGroup_layoutMode: 544 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 545 break; 546 } 547 } 548 549 a.recycle(); 550 } 551 552 /** 553 * Gets the descendant focusability of this view group. The descendant 554 * focusability defines the relationship between this view group and its 555 * descendants when looking for a view to take focus in 556 * {@link #requestFocus(int, android.graphics.Rect)}. 557 * 558 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 559 * {@link #FOCUS_BLOCK_DESCENDANTS}. 560 */ 561 @ViewDebug.ExportedProperty(category = "focus", mapping = { 562 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 563 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 564 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 565 }) 566 public int getDescendantFocusability() { 567 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 568 } 569 570 /** 571 * Set the descendant focusability of this view group. This defines the relationship 572 * between this view group and its descendants when looking for a view to 573 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 574 * 575 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 576 * {@link #FOCUS_BLOCK_DESCENDANTS}. 577 */ 578 public void setDescendantFocusability(int focusability) { 579 switch (focusability) { 580 case FOCUS_BEFORE_DESCENDANTS: 581 case FOCUS_AFTER_DESCENDANTS: 582 case FOCUS_BLOCK_DESCENDANTS: 583 break; 584 default: 585 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 586 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 587 } 588 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 589 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 590 } 591 592 /** 593 * {@inheritDoc} 594 */ 595 @Override 596 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 597 if (mFocused != null) { 598 mFocused.unFocus(); 599 mFocused = null; 600 } 601 super.handleFocusGainInternal(direction, previouslyFocusedRect); 602 } 603 604 /** 605 * {@inheritDoc} 606 */ 607 public void requestChildFocus(View child, View focused) { 608 if (DBG) { 609 System.out.println(this + " requestChildFocus()"); 610 } 611 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 612 return; 613 } 614 615 // Unfocus us, if necessary 616 super.unFocus(); 617 618 // We had a previous notion of who had focus. Clear it. 619 if (mFocused != child) { 620 if (mFocused != null) { 621 mFocused.unFocus(); 622 } 623 624 mFocused = child; 625 } 626 if (mParent != null) { 627 mParent.requestChildFocus(this, focused); 628 } 629 } 630 631 /** 632 * {@inheritDoc} 633 */ 634 public void focusableViewAvailable(View v) { 635 if (mParent != null 636 // shortcut: don't report a new focusable view if we block our descendants from 637 // getting focus 638 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 639 // shortcut: don't report a new focusable view if we already are focused 640 // (and we don't prefer our descendants) 641 // 642 // note: knowing that mFocused is non-null is not a good enough reason 643 // to break the traversal since in that case we'd actually have to find 644 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 645 // an ancestor of v; this will get checked for at ViewAncestor 646 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 647 mParent.focusableViewAvailable(v); 648 } 649 } 650 651 /** 652 * {@inheritDoc} 653 */ 654 public boolean showContextMenuForChild(View originalView) { 655 return mParent != null && mParent.showContextMenuForChild(originalView); 656 } 657 658 /** 659 * {@inheritDoc} 660 */ 661 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 662 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 663 } 664 665 /** 666 * Find the nearest view in the specified direction that wants to take 667 * focus. 668 * 669 * @param focused The view that currently has focus 670 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 671 * FOCUS_RIGHT, or 0 for not applicable. 672 */ 673 public View focusSearch(View focused, int direction) { 674 if (isRootNamespace()) { 675 // root namespace means we should consider ourselves the top of the 676 // tree for focus searching; otherwise we could be focus searching 677 // into other tabs. see LocalActivityManager and TabHost for more info 678 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 679 } else if (mParent != null) { 680 return mParent.focusSearch(focused, direction); 681 } 682 return null; 683 } 684 685 /** 686 * {@inheritDoc} 687 */ 688 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 689 return false; 690 } 691 692 /** 693 * {@inheritDoc} 694 */ 695 @Override 696 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 697 ViewParent parent = mParent; 698 if (parent == null) { 699 return false; 700 } 701 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 702 if (!propagate) { 703 return false; 704 } 705 return parent.requestSendAccessibilityEvent(this, event); 706 } 707 708 /** 709 * Called when a child has requested sending an {@link AccessibilityEvent} and 710 * gives an opportunity to its parent to augment the event. 711 * <p> 712 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 713 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 714 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 715 * is responsible for handling this call. 716 * </p> 717 * 718 * @param child The child which requests sending the event. 719 * @param event The event to be sent. 720 * @return True if the event should be sent. 721 * 722 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 723 */ 724 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 725 if (mAccessibilityDelegate != null) { 726 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 727 } else { 728 return onRequestSendAccessibilityEventInternal(child, event); 729 } 730 } 731 732 /** 733 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 734 * 735 * Note: Called from the default {@link View.AccessibilityDelegate}. 736 */ 737 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 738 return true; 739 } 740 741 /** 742 * Called when a child view has changed whether or not it is tracking transient state. 743 * 744 * @hide 745 */ 746 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 747 final boolean oldHasTransientState = hasTransientState(); 748 if (childHasTransientState) { 749 mChildCountWithTransientState++; 750 } else { 751 mChildCountWithTransientState--; 752 } 753 754 final boolean newHasTransientState = hasTransientState(); 755 if (mParent != null && oldHasTransientState != newHasTransientState) { 756 try { 757 mParent.childHasTransientStateChanged(this, newHasTransientState); 758 } catch (AbstractMethodError e) { 759 Log.e(TAG, mParent.getClass().getSimpleName() + 760 " does not fully implement ViewParent", e); 761 } 762 } 763 } 764 765 /** 766 * @hide 767 */ 768 @Override 769 public boolean hasTransientState() { 770 return mChildCountWithTransientState > 0 || super.hasTransientState(); 771 } 772 773 /** 774 * {@inheritDoc} 775 */ 776 @Override 777 public boolean dispatchUnhandledMove(View focused, int direction) { 778 return mFocused != null && 779 mFocused.dispatchUnhandledMove(focused, direction); 780 } 781 782 /** 783 * {@inheritDoc} 784 */ 785 public void clearChildFocus(View child) { 786 if (DBG) { 787 System.out.println(this + " clearChildFocus()"); 788 } 789 790 mFocused = null; 791 if (mParent != null) { 792 mParent.clearChildFocus(this); 793 } 794 } 795 796 /** 797 * {@inheritDoc} 798 */ 799 @Override 800 public void clearFocus() { 801 if (DBG) { 802 System.out.println(this + " clearFocus()"); 803 } 804 if (mFocused == null) { 805 super.clearFocus(); 806 } else { 807 View focused = mFocused; 808 mFocused = null; 809 focused.clearFocus(); 810 } 811 } 812 813 /** 814 * {@inheritDoc} 815 */ 816 @Override 817 void unFocus() { 818 if (DBG) { 819 System.out.println(this + " unFocus()"); 820 } 821 if (mFocused == null) { 822 super.unFocus(); 823 } else { 824 mFocused.unFocus(); 825 mFocused = null; 826 } 827 } 828 829 /** 830 * Returns the focused child of this view, if any. The child may have focus 831 * or contain focus. 832 * 833 * @return the focused child or null. 834 */ 835 public View getFocusedChild() { 836 return mFocused; 837 } 838 839 /** 840 * Returns true if this view has or contains focus 841 * 842 * @return true if this view has or contains focus 843 */ 844 @Override 845 public boolean hasFocus() { 846 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 847 } 848 849 /* 850 * (non-Javadoc) 851 * 852 * @see android.view.View#findFocus() 853 */ 854 @Override 855 public View findFocus() { 856 if (DBG) { 857 System.out.println("Find focus in " + this + ": flags=" 858 + isFocused() + ", child=" + mFocused); 859 } 860 861 if (isFocused()) { 862 return this; 863 } 864 865 if (mFocused != null) { 866 return mFocused.findFocus(); 867 } 868 return null; 869 } 870 871 /** 872 * {@inheritDoc} 873 */ 874 @Override 875 public boolean hasFocusable() { 876 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 877 return false; 878 } 879 880 if (isFocusable()) { 881 return true; 882 } 883 884 final int descendantFocusability = getDescendantFocusability(); 885 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 886 final int count = mChildrenCount; 887 final View[] children = mChildren; 888 889 for (int i = 0; i < count; i++) { 890 final View child = children[i]; 891 if (child.hasFocusable()) { 892 return true; 893 } 894 } 895 } 896 897 return false; 898 } 899 900 /** 901 * {@inheritDoc} 902 */ 903 @Override 904 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 905 final int focusableCount = views.size(); 906 907 final int descendantFocusability = getDescendantFocusability(); 908 909 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 910 final int count = mChildrenCount; 911 final View[] children = mChildren; 912 913 for (int i = 0; i < count; i++) { 914 final View child = children[i]; 915 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 916 child.addFocusables(views, direction, focusableMode); 917 } 918 } 919 } 920 921 // we add ourselves (if focusable) in all cases except for when we are 922 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 923 // to avoid the focus search finding layouts when a more precise search 924 // among the focusable children would be more interesting. 925 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 926 // No focusable descendants 927 || (focusableCount == views.size())) { 928 super.addFocusables(views, direction, focusableMode); 929 } 930 } 931 932 @Override 933 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 934 super.findViewsWithText(outViews, text, flags); 935 final int childrenCount = mChildrenCount; 936 final View[] children = mChildren; 937 for (int i = 0; i < childrenCount; i++) { 938 View child = children[i]; 939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 940 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 941 child.findViewsWithText(outViews, text, flags); 942 } 943 } 944 } 945 946 /** @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 /** 1133 * {@inheritDoc} 1134 */ 1135 // TODO: Write real docs 1136 @Override 1137 public boolean dispatchDragEvent(DragEvent event) { 1138 boolean retval = false; 1139 final float tx = event.mX; 1140 final float ty = event.mY; 1141 1142 ViewRootImpl root = getViewRootImpl(); 1143 1144 // Dispatch down the view hierarchy 1145 switch (event.mAction) { 1146 case DragEvent.ACTION_DRAG_STARTED: { 1147 // clear state to recalculate which views we drag over 1148 mCurrentDragView = null; 1149 1150 // Set up our tracking of drag-started notifications 1151 mCurrentDrag = DragEvent.obtain(event); 1152 if (mDragNotifiedChildren == null) { 1153 mDragNotifiedChildren = new HashSet<View>(); 1154 } else { 1155 mDragNotifiedChildren.clear(); 1156 } 1157 1158 // Now dispatch down to our children, caching the responses 1159 mChildAcceptsDrag = false; 1160 final int count = mChildrenCount; 1161 final View[] children = mChildren; 1162 for (int i = 0; i < count; i++) { 1163 final View child = children[i]; 1164 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1165 if (child.getVisibility() == VISIBLE) { 1166 final boolean handled = notifyChildOfDrag(children[i]); 1167 if (handled) { 1168 mChildAcceptsDrag = true; 1169 } 1170 } 1171 } 1172 1173 // Return HANDLED if one of our children can accept the drag 1174 if (mChildAcceptsDrag) { 1175 retval = true; 1176 } 1177 } break; 1178 1179 case DragEvent.ACTION_DRAG_ENDED: { 1180 // Release the bookkeeping now that the drag lifecycle has ended 1181 if (mDragNotifiedChildren != null) { 1182 for (View child : mDragNotifiedChildren) { 1183 // If a child was notified about an ongoing drag, it's told that it's over 1184 child.dispatchDragEvent(event); 1185 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1186 child.refreshDrawableState(); 1187 } 1188 1189 mDragNotifiedChildren.clear(); 1190 if (mCurrentDrag != null) { 1191 mCurrentDrag.recycle(); 1192 mCurrentDrag = null; 1193 } 1194 } 1195 1196 // We consider drag-ended to have been handled if one of our children 1197 // had offered to handle the drag. 1198 if (mChildAcceptsDrag) { 1199 retval = true; 1200 } 1201 } break; 1202 1203 case DragEvent.ACTION_DRAG_LOCATION: { 1204 // Find the [possibly new] drag target 1205 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1206 1207 // If we've changed apparent drag target, tell the view root which view 1208 // we're over now [for purposes of the eventual drag-recipient-changed 1209 // notifications to the framework] and tell the new target that the drag 1210 // has entered its bounds. The root will see setDragFocus() calls all 1211 // the way down to the final leaf view that is handling the LOCATION event 1212 // before reporting the new potential recipient to the framework. 1213 if (mCurrentDragView != target) { 1214 root.setDragFocus(target); 1215 1216 final int action = event.mAction; 1217 // If we've dragged off of a child view, send it the EXITED message 1218 if (mCurrentDragView != null) { 1219 final View view = mCurrentDragView; 1220 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1221 view.dispatchDragEvent(event); 1222 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1223 view.refreshDrawableState(); 1224 } 1225 mCurrentDragView = target; 1226 1227 // If we've dragged over a new child view, send it the ENTERED message 1228 if (target != null) { 1229 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1230 target.dispatchDragEvent(event); 1231 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1232 target.refreshDrawableState(); 1233 } 1234 event.mAction = action; // restore the event's original state 1235 } 1236 1237 // Dispatch the actual drag location notice, localized into its coordinates 1238 if (target != null) { 1239 event.mX = mLocalPoint.x; 1240 event.mY = mLocalPoint.y; 1241 1242 retval = target.dispatchDragEvent(event); 1243 1244 event.mX = tx; 1245 event.mY = ty; 1246 } 1247 } break; 1248 1249 /* Entered / exited dispatch 1250 * 1251 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1252 * that we're about to get the corresponding LOCATION event, which we will use to 1253 * determine which of our children is the new target; at that point we will 1254 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1255 * 1256 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1257 * drag has left this ViewGroup, we know by definition that every contained subview 1258 * is also no longer under the drag point. 1259 */ 1260 1261 case DragEvent.ACTION_DRAG_EXITED: { 1262 if (mCurrentDragView != null) { 1263 final View view = mCurrentDragView; 1264 view.dispatchDragEvent(event); 1265 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1266 view.refreshDrawableState(); 1267 1268 mCurrentDragView = null; 1269 } 1270 } break; 1271 1272 case DragEvent.ACTION_DROP: { 1273 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1274 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1275 if (target != null) { 1276 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1277 event.mX = mLocalPoint.x; 1278 event.mY = mLocalPoint.y; 1279 retval = target.dispatchDragEvent(event); 1280 event.mX = tx; 1281 event.mY = ty; 1282 } else { 1283 if (ViewDebug.DEBUG_DRAG) { 1284 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1285 } 1286 } 1287 } break; 1288 } 1289 1290 // If none of our children could handle the event, try here 1291 if (!retval) { 1292 // Call up to the View implementation that dispatches to installed listeners 1293 retval = super.dispatchDragEvent(event); 1294 } 1295 return retval; 1296 } 1297 1298 // Find the frontmost child view that lies under the given point, and calculate 1299 // the position within its own local coordinate system. 1300 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1301 final int count = mChildrenCount; 1302 final View[] children = mChildren; 1303 for (int i = count - 1; i >= 0; i--) { 1304 final View child = children[i]; 1305 if (!child.canAcceptDrag()) { 1306 continue; 1307 } 1308 1309 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1310 return child; 1311 } 1312 } 1313 return null; 1314 } 1315 1316 boolean notifyChildOfDrag(View child) { 1317 if (ViewDebug.DEBUG_DRAG) { 1318 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1319 } 1320 1321 boolean canAccept = false; 1322 if (! mDragNotifiedChildren.contains(child)) { 1323 mDragNotifiedChildren.add(child); 1324 canAccept = child.dispatchDragEvent(mCurrentDrag); 1325 if (canAccept && !child.canAcceptDrag()) { 1326 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1327 child.refreshDrawableState(); 1328 } 1329 } 1330 return canAccept; 1331 } 1332 1333 @Override 1334 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1335 super.dispatchWindowSystemUiVisiblityChanged(visible); 1336 1337 final int count = mChildrenCount; 1338 final View[] children = mChildren; 1339 for (int i=0; i <count; i++) { 1340 final View child = children[i]; 1341 child.dispatchWindowSystemUiVisiblityChanged(visible); 1342 } 1343 } 1344 1345 @Override 1346 public void dispatchSystemUiVisibilityChanged(int visible) { 1347 super.dispatchSystemUiVisibilityChanged(visible); 1348 1349 final int count = mChildrenCount; 1350 final View[] children = mChildren; 1351 for (int i=0; i <count; i++) { 1352 final View child = children[i]; 1353 child.dispatchSystemUiVisibilityChanged(visible); 1354 } 1355 } 1356 1357 @Override 1358 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1359 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1360 1361 final int count = mChildrenCount; 1362 final View[] children = mChildren; 1363 for (int i=0; i <count; i++) { 1364 final View child = children[i]; 1365 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1366 } 1367 return changed; 1368 } 1369 1370 /** 1371 * {@inheritDoc} 1372 */ 1373 @Override 1374 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1375 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1376 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1377 return super.dispatchKeyEventPreIme(event); 1378 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1379 == PFLAG_HAS_BOUNDS) { 1380 return mFocused.dispatchKeyEventPreIme(event); 1381 } 1382 return false; 1383 } 1384 1385 /** 1386 * {@inheritDoc} 1387 */ 1388 @Override 1389 public boolean dispatchKeyEvent(KeyEvent event) { 1390 if (mInputEventConsistencyVerifier != null) { 1391 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1392 } 1393 1394 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1395 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1396 if (super.dispatchKeyEvent(event)) { 1397 return true; 1398 } 1399 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1400 == PFLAG_HAS_BOUNDS) { 1401 if (mFocused.dispatchKeyEvent(event)) { 1402 return true; 1403 } 1404 } 1405 1406 if (mInputEventConsistencyVerifier != null) { 1407 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1408 } 1409 return false; 1410 } 1411 1412 /** 1413 * {@inheritDoc} 1414 */ 1415 @Override 1416 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1417 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1418 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1419 return super.dispatchKeyShortcutEvent(event); 1420 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1421 == PFLAG_HAS_BOUNDS) { 1422 return mFocused.dispatchKeyShortcutEvent(event); 1423 } 1424 return false; 1425 } 1426 1427 /** 1428 * {@inheritDoc} 1429 */ 1430 @Override 1431 public boolean dispatchTrackballEvent(MotionEvent event) { 1432 if (mInputEventConsistencyVerifier != null) { 1433 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1434 } 1435 1436 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1437 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1438 if (super.dispatchTrackballEvent(event)) { 1439 return true; 1440 } 1441 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1442 == PFLAG_HAS_BOUNDS) { 1443 if (mFocused.dispatchTrackballEvent(event)) { 1444 return true; 1445 } 1446 } 1447 1448 if (mInputEventConsistencyVerifier != null) { 1449 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1450 } 1451 return false; 1452 } 1453 1454 /** 1455 * {@inheritDoc} 1456 */ 1457 @SuppressWarnings({"ConstantConditions"}) 1458 @Override 1459 protected boolean dispatchHoverEvent(MotionEvent event) { 1460 final int action = event.getAction(); 1461 1462 // First check whether the view group wants to intercept the hover event. 1463 final boolean interceptHover = onInterceptHoverEvent(event); 1464 event.setAction(action); // restore action in case it was changed 1465 1466 MotionEvent eventNoHistory = event; 1467 boolean handled = false; 1468 1469 // Send events to the hovered children and build a new list of hover targets until 1470 // one is found that handles the event. 1471 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1472 mFirstHoverTarget = null; 1473 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1474 final float x = event.getX(); 1475 final float y = event.getY(); 1476 final int childrenCount = mChildrenCount; 1477 if (childrenCount != 0) { 1478 final boolean customChildOrder = isChildrenDrawingOrderEnabled(); 1479 final View[] children = mChildren; 1480 HoverTarget lastHoverTarget = null; 1481 for (int i = childrenCount - 1; i >= 0; i--) { 1482 final int childIndex = customChildOrder 1483 ? getChildDrawingOrder(childrenCount, i) : i; 1484 final View child = children[childIndex]; 1485 if (!canViewReceivePointerEvents(child) 1486 || !isTransformedTouchPointInView(x, y, child, null)) { 1487 continue; 1488 } 1489 1490 // Obtain a hover target for this child. Dequeue it from the 1491 // old hover target list if the child was previously hovered. 1492 HoverTarget hoverTarget = firstOldHoverTarget; 1493 final boolean wasHovered; 1494 for (HoverTarget predecessor = null; ;) { 1495 if (hoverTarget == null) { 1496 hoverTarget = HoverTarget.obtain(child); 1497 wasHovered = false; 1498 break; 1499 } 1500 1501 if (hoverTarget.child == child) { 1502 if (predecessor != null) { 1503 predecessor.next = hoverTarget.next; 1504 } else { 1505 firstOldHoverTarget = hoverTarget.next; 1506 } 1507 hoverTarget.next = null; 1508 wasHovered = true; 1509 break; 1510 } 1511 1512 predecessor = hoverTarget; 1513 hoverTarget = hoverTarget.next; 1514 } 1515 1516 // Enqueue the hover target onto the new hover target list. 1517 if (lastHoverTarget != null) { 1518 lastHoverTarget.next = hoverTarget; 1519 } else { 1520 mFirstHoverTarget = hoverTarget; 1521 } 1522 lastHoverTarget = hoverTarget; 1523 1524 // Dispatch the event to the child. 1525 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1526 if (!wasHovered) { 1527 // Send the enter as is. 1528 handled |= dispatchTransformedGenericPointerEvent( 1529 event, child); // enter 1530 } 1531 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1532 if (!wasHovered) { 1533 // Synthesize an enter from a move. 1534 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1535 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1536 handled |= dispatchTransformedGenericPointerEvent( 1537 eventNoHistory, child); // enter 1538 eventNoHistory.setAction(action); 1539 1540 handled |= dispatchTransformedGenericPointerEvent( 1541 eventNoHistory, child); // move 1542 } else { 1543 // Send the move as is. 1544 handled |= dispatchTransformedGenericPointerEvent(event, child); 1545 } 1546 } 1547 if (handled) { 1548 break; 1549 } 1550 } 1551 } 1552 } 1553 1554 // Send exit events to all previously hovered children that are no longer hovered. 1555 while (firstOldHoverTarget != null) { 1556 final View child = firstOldHoverTarget.child; 1557 1558 // Exit the old hovered child. 1559 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1560 // Send the exit as is. 1561 handled |= dispatchTransformedGenericPointerEvent( 1562 event, child); // exit 1563 } else { 1564 // Synthesize an exit from a move or enter. 1565 // Ignore the result because hover focus has moved to a different view. 1566 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1567 dispatchTransformedGenericPointerEvent( 1568 event, child); // move 1569 } 1570 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1571 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1572 dispatchTransformedGenericPointerEvent( 1573 eventNoHistory, child); // exit 1574 eventNoHistory.setAction(action); 1575 } 1576 1577 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1578 firstOldHoverTarget.recycle(); 1579 firstOldHoverTarget = nextOldHoverTarget; 1580 } 1581 1582 // Send events to the view group itself if no children have handled it. 1583 boolean newHoveredSelf = !handled; 1584 if (newHoveredSelf == mHoveredSelf) { 1585 if (newHoveredSelf) { 1586 // Send event to the view group as before. 1587 handled |= super.dispatchHoverEvent(event); 1588 } 1589 } else { 1590 if (mHoveredSelf) { 1591 // Exit the view group. 1592 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1593 // Send the exit as is. 1594 handled |= super.dispatchHoverEvent(event); // exit 1595 } else { 1596 // Synthesize an exit from a move or enter. 1597 // Ignore the result because hover focus is moving to a different view. 1598 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1599 super.dispatchHoverEvent(event); // move 1600 } 1601 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1602 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1603 super.dispatchHoverEvent(eventNoHistory); // exit 1604 eventNoHistory.setAction(action); 1605 } 1606 mHoveredSelf = false; 1607 } 1608 1609 if (newHoveredSelf) { 1610 // Enter the view group. 1611 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1612 // Send the enter as is. 1613 handled |= super.dispatchHoverEvent(event); // enter 1614 mHoveredSelf = true; 1615 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1616 // Synthesize an enter from a move. 1617 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1618 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1619 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1620 eventNoHistory.setAction(action); 1621 1622 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1623 mHoveredSelf = true; 1624 } 1625 } 1626 } 1627 1628 // Recycle the copy of the event that we made. 1629 if (eventNoHistory != event) { 1630 eventNoHistory.recycle(); 1631 } 1632 1633 // Done. 1634 return handled; 1635 } 1636 1637 private void exitHoverTargets() { 1638 if (mHoveredSelf || mFirstHoverTarget != null) { 1639 final long now = SystemClock.uptimeMillis(); 1640 MotionEvent event = MotionEvent.obtain(now, now, 1641 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1642 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1643 dispatchHoverEvent(event); 1644 event.recycle(); 1645 } 1646 } 1647 1648 private void cancelHoverTarget(View view) { 1649 HoverTarget predecessor = null; 1650 HoverTarget target = mFirstHoverTarget; 1651 while (target != null) { 1652 final HoverTarget next = target.next; 1653 if (target.child == view) { 1654 if (predecessor == null) { 1655 mFirstHoverTarget = next; 1656 } else { 1657 predecessor.next = next; 1658 } 1659 target.recycle(); 1660 1661 final long now = SystemClock.uptimeMillis(); 1662 MotionEvent event = MotionEvent.obtain(now, now, 1663 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1664 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1665 view.dispatchHoverEvent(event); 1666 event.recycle(); 1667 return; 1668 } 1669 predecessor = target; 1670 target = next; 1671 } 1672 } 1673 1674 /** @hide */ 1675 @Override 1676 protected boolean hasHoveredChild() { 1677 return mFirstHoverTarget != null; 1678 } 1679 1680 @Override 1681 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1682 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1683 try { 1684 final int childrenCount = children.getChildCount(); 1685 for (int i = 0; i < childrenCount; i++) { 1686 View child = children.getChildAt(i); 1687 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1688 if (child.includeForAccessibility()) { 1689 childrenForAccessibility.add(child); 1690 } else { 1691 child.addChildrenForAccessibility(childrenForAccessibility); 1692 } 1693 } 1694 } 1695 } finally { 1696 children.recycle(); 1697 } 1698 } 1699 1700 /** 1701 * Implement this method to intercept hover events before they are handled 1702 * by child views. 1703 * <p> 1704 * This method is called before dispatching a hover event to a child of 1705 * the view group or to the view group's own {@link #onHoverEvent} to allow 1706 * the view group a chance to intercept the hover event. 1707 * This method can also be used to watch all pointer motions that occur within 1708 * the bounds of the view group even when the pointer is hovering over 1709 * a child of the view group rather than over the view group itself. 1710 * </p><p> 1711 * The view group can prevent its children from receiving hover events by 1712 * implementing this method and returning <code>true</code> to indicate 1713 * that it would like to intercept hover events. The view group must 1714 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1715 * for as long as it wishes to continue intercepting hover events from 1716 * its children. 1717 * </p><p> 1718 * Interception preserves the invariant that at most one view can be 1719 * hovered at a time by transferring hover focus from the currently hovered 1720 * child to the view group or vice-versa as needed. 1721 * </p><p> 1722 * If this method returns <code>true</code> and a child is already hovered, then the 1723 * child view will first receive a hover exit event and then the view group 1724 * itself will receive a hover enter event in {@link #onHoverEvent}. 1725 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1726 * events and instead returns <code>false</code> while the pointer is hovering 1727 * within the bounds of one of a child, then the view group will first receive a 1728 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1729 * receive a hover enter event. 1730 * </p><p> 1731 * The default implementation always returns false. 1732 * </p> 1733 * 1734 * @param event The motion event that describes the hover. 1735 * @return True if the view group would like to intercept the hover event 1736 * and prevent its children from receiving it. 1737 */ 1738 public boolean onInterceptHoverEvent(MotionEvent event) { 1739 return false; 1740 } 1741 1742 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1743 if (event.getHistorySize() == 0) { 1744 return event; 1745 } 1746 return MotionEvent.obtainNoHistory(event); 1747 } 1748 1749 /** 1750 * {@inheritDoc} 1751 */ 1752 @Override 1753 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1754 // Send the event to the child under the pointer. 1755 final int childrenCount = mChildrenCount; 1756 if (childrenCount != 0) { 1757 final View[] children = mChildren; 1758 final float x = event.getX(); 1759 final float y = event.getY(); 1760 1761 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1762 for (int i = childrenCount - 1; i >= 0; i--) { 1763 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1764 final View child = children[childIndex]; 1765 if (!canViewReceivePointerEvents(child) 1766 || !isTransformedTouchPointInView(x, y, child, null)) { 1767 continue; 1768 } 1769 1770 if (dispatchTransformedGenericPointerEvent(event, child)) { 1771 return true; 1772 } 1773 } 1774 } 1775 1776 // No child handled the event. Send it to this view group. 1777 return super.dispatchGenericPointerEvent(event); 1778 } 1779 1780 /** 1781 * {@inheritDoc} 1782 */ 1783 @Override 1784 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1785 // Send the event to the focused child or to this view group if it has focus. 1786 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1787 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1788 return super.dispatchGenericFocusedEvent(event); 1789 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1790 == PFLAG_HAS_BOUNDS) { 1791 return mFocused.dispatchGenericMotionEvent(event); 1792 } 1793 return false; 1794 } 1795 1796 /** 1797 * Dispatches a generic pointer event to a child, taking into account 1798 * transformations that apply to the child. 1799 * 1800 * @param event The event to send. 1801 * @param child The view to send the event to. 1802 * @return {@code true} if the child handled the event. 1803 */ 1804 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1805 final float offsetX = mScrollX - child.mLeft; 1806 final float offsetY = mScrollY - child.mTop; 1807 1808 boolean handled; 1809 if (!child.hasIdentityMatrix()) { 1810 MotionEvent transformedEvent = MotionEvent.obtain(event); 1811 transformedEvent.offsetLocation(offsetX, offsetY); 1812 transformedEvent.transform(child.getInverseMatrix()); 1813 handled = child.dispatchGenericMotionEvent(transformedEvent); 1814 transformedEvent.recycle(); 1815 } else { 1816 event.offsetLocation(offsetX, offsetY); 1817 handled = child.dispatchGenericMotionEvent(event); 1818 event.offsetLocation(-offsetX, -offsetY); 1819 } 1820 return handled; 1821 } 1822 1823 /** 1824 * {@inheritDoc} 1825 */ 1826 @Override 1827 public boolean dispatchTouchEvent(MotionEvent ev) { 1828 if (mInputEventConsistencyVerifier != null) { 1829 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1830 } 1831 1832 boolean handled = false; 1833 if (onFilterTouchEventForSecurity(ev)) { 1834 final int action = ev.getAction(); 1835 final int actionMasked = action & MotionEvent.ACTION_MASK; 1836 1837 // Handle an initial down. 1838 if (actionMasked == MotionEvent.ACTION_DOWN) { 1839 // Throw away all previous state when starting a new touch gesture. 1840 // The framework may have dropped the up or cancel event for the previous gesture 1841 // due to an app switch, ANR, or some other state change. 1842 cancelAndClearTouchTargets(ev); 1843 resetTouchState(); 1844 } 1845 1846 // Check for interception. 1847 final boolean intercepted; 1848 if (actionMasked == MotionEvent.ACTION_DOWN 1849 || mFirstTouchTarget != null) { 1850 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1851 if (!disallowIntercept) { 1852 intercepted = onInterceptTouchEvent(ev); 1853 ev.setAction(action); // restore action in case it was changed 1854 } else { 1855 intercepted = false; 1856 } 1857 } else { 1858 // There are no touch targets and this action is not an initial down 1859 // so this view group continues to intercept touches. 1860 intercepted = true; 1861 } 1862 1863 // Check for cancelation. 1864 final boolean canceled = resetCancelNextUpFlag(this) 1865 || actionMasked == MotionEvent.ACTION_CANCEL; 1866 1867 // Update list of touch targets for pointer down, if needed. 1868 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1869 TouchTarget newTouchTarget = null; 1870 boolean alreadyDispatchedToNewTouchTarget = false; 1871 if (!canceled && !intercepted) { 1872 if (actionMasked == MotionEvent.ACTION_DOWN 1873 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1874 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1875 final int actionIndex = ev.getActionIndex(); // always 0 for down 1876 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1877 : TouchTarget.ALL_POINTER_IDS; 1878 1879 // Clean up earlier touch targets for this pointer id in case they 1880 // have become out of sync. 1881 removePointersFromTouchTargets(idBitsToAssign); 1882 1883 final int childrenCount = mChildrenCount; 1884 if (newTouchTarget == null && childrenCount != 0) { 1885 final float x = ev.getX(actionIndex); 1886 final float y = ev.getY(actionIndex); 1887 // Find a child that can receive the event. 1888 // Scan children from front to back. 1889 final View[] children = mChildren; 1890 1891 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1892 for (int i = childrenCount - 1; i >= 0; i--) { 1893 final int childIndex = customOrder ? 1894 getChildDrawingOrder(childrenCount, i) : i; 1895 final View child = children[childIndex]; 1896 if (!canViewReceivePointerEvents(child) 1897 || !isTransformedTouchPointInView(x, y, child, null)) { 1898 continue; 1899 } 1900 1901 newTouchTarget = getTouchTarget(child); 1902 if (newTouchTarget != null) { 1903 // Child is already receiving touch within its bounds. 1904 // Give it the new pointer in addition to the ones it is handling. 1905 newTouchTarget.pointerIdBits |= idBitsToAssign; 1906 break; 1907 } 1908 1909 resetCancelNextUpFlag(child); 1910 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1911 // Child wants to receive touch within its bounds. 1912 mLastTouchDownTime = ev.getDownTime(); 1913 mLastTouchDownIndex = childIndex; 1914 mLastTouchDownX = ev.getX(); 1915 mLastTouchDownY = ev.getY(); 1916 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1917 alreadyDispatchedToNewTouchTarget = true; 1918 break; 1919 } 1920 } 1921 } 1922 1923 if (newTouchTarget == null && mFirstTouchTarget != null) { 1924 // Did not find a child to receive the event. 1925 // Assign the pointer to the least recently added target. 1926 newTouchTarget = mFirstTouchTarget; 1927 while (newTouchTarget.next != null) { 1928 newTouchTarget = newTouchTarget.next; 1929 } 1930 newTouchTarget.pointerIdBits |= idBitsToAssign; 1931 } 1932 } 1933 } 1934 1935 // Dispatch to touch targets. 1936 if (mFirstTouchTarget == null) { 1937 // No touch targets so treat this as an ordinary view. 1938 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1939 TouchTarget.ALL_POINTER_IDS); 1940 } else { 1941 // Dispatch to touch targets, excluding the new touch target if we already 1942 // dispatched to it. Cancel touch targets if necessary. 1943 TouchTarget predecessor = null; 1944 TouchTarget target = mFirstTouchTarget; 1945 while (target != null) { 1946 final TouchTarget next = target.next; 1947 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1948 handled = true; 1949 } else { 1950 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1951 || intercepted; 1952 if (dispatchTransformedTouchEvent(ev, cancelChild, 1953 target.child, target.pointerIdBits)) { 1954 handled = true; 1955 } 1956 if (cancelChild) { 1957 if (predecessor == null) { 1958 mFirstTouchTarget = next; 1959 } else { 1960 predecessor.next = next; 1961 } 1962 target.recycle(); 1963 target = next; 1964 continue; 1965 } 1966 } 1967 predecessor = target; 1968 target = next; 1969 } 1970 } 1971 1972 // Update list of touch targets for pointer up or cancel, if needed. 1973 if (canceled 1974 || actionMasked == MotionEvent.ACTION_UP 1975 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1976 resetTouchState(); 1977 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1978 final int actionIndex = ev.getActionIndex(); 1979 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1980 removePointersFromTouchTargets(idBitsToRemove); 1981 } 1982 } 1983 1984 if (!handled && mInputEventConsistencyVerifier != null) { 1985 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1986 } 1987 return handled; 1988 } 1989 1990 /** 1991 * Resets all touch state in preparation for a new cycle. 1992 */ 1993 private void resetTouchState() { 1994 clearTouchTargets(); 1995 resetCancelNextUpFlag(this); 1996 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1997 } 1998 1999 /** 2000 * Resets the cancel next up flag. 2001 * Returns true if the flag was previously set. 2002 */ 2003 private static boolean resetCancelNextUpFlag(View view) { 2004 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2005 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2006 return true; 2007 } 2008 return false; 2009 } 2010 2011 /** 2012 * Clears all touch targets. 2013 */ 2014 private void clearTouchTargets() { 2015 TouchTarget target = mFirstTouchTarget; 2016 if (target != null) { 2017 do { 2018 TouchTarget next = target.next; 2019 target.recycle(); 2020 target = next; 2021 } while (target != null); 2022 mFirstTouchTarget = null; 2023 } 2024 } 2025 2026 /** 2027 * Cancels and clears all touch targets. 2028 */ 2029 private void cancelAndClearTouchTargets(MotionEvent event) { 2030 if (mFirstTouchTarget != null) { 2031 boolean syntheticEvent = false; 2032 if (event == null) { 2033 final long now = SystemClock.uptimeMillis(); 2034 event = MotionEvent.obtain(now, now, 2035 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2036 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2037 syntheticEvent = true; 2038 } 2039 2040 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2041 resetCancelNextUpFlag(target.child); 2042 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2043 } 2044 clearTouchTargets(); 2045 2046 if (syntheticEvent) { 2047 event.recycle(); 2048 } 2049 } 2050 } 2051 2052 /** 2053 * Gets the touch target for specified child view. 2054 * Returns null if not found. 2055 */ 2056 private TouchTarget getTouchTarget(View child) { 2057 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2058 if (target.child == child) { 2059 return target; 2060 } 2061 } 2062 return null; 2063 } 2064 2065 /** 2066 * Adds a touch target for specified child to the beginning of the list. 2067 * Assumes the target child is not already present. 2068 */ 2069 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2070 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2071 target.next = mFirstTouchTarget; 2072 mFirstTouchTarget = target; 2073 return target; 2074 } 2075 2076 /** 2077 * Removes the pointer ids from consideration. 2078 */ 2079 private void removePointersFromTouchTargets(int pointerIdBits) { 2080 TouchTarget predecessor = null; 2081 TouchTarget target = mFirstTouchTarget; 2082 while (target != null) { 2083 final TouchTarget next = target.next; 2084 if ((target.pointerIdBits & pointerIdBits) != 0) { 2085 target.pointerIdBits &= ~pointerIdBits; 2086 if (target.pointerIdBits == 0) { 2087 if (predecessor == null) { 2088 mFirstTouchTarget = next; 2089 } else { 2090 predecessor.next = next; 2091 } 2092 target.recycle(); 2093 target = next; 2094 continue; 2095 } 2096 } 2097 predecessor = target; 2098 target = next; 2099 } 2100 } 2101 2102 private void cancelTouchTarget(View view) { 2103 TouchTarget predecessor = null; 2104 TouchTarget target = mFirstTouchTarget; 2105 while (target != null) { 2106 final TouchTarget next = target.next; 2107 if (target.child == view) { 2108 if (predecessor == null) { 2109 mFirstTouchTarget = next; 2110 } else { 2111 predecessor.next = next; 2112 } 2113 target.recycle(); 2114 2115 final long now = SystemClock.uptimeMillis(); 2116 MotionEvent event = MotionEvent.obtain(now, now, 2117 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2118 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2119 view.dispatchTouchEvent(event); 2120 event.recycle(); 2121 return; 2122 } 2123 predecessor = target; 2124 target = next; 2125 } 2126 } 2127 2128 /** 2129 * Returns true if a child view can receive pointer events. 2130 * @hide 2131 */ 2132 private static boolean canViewReceivePointerEvents(View child) { 2133 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2134 || child.getAnimation() != null; 2135 } 2136 2137 /** 2138 * Returns true if a child view contains the specified point when transformed 2139 * into its coordinate space. 2140 * Child must not be null. 2141 * @hide 2142 */ 2143 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2144 PointF outLocalPoint) { 2145 float localX = x + mScrollX - child.mLeft; 2146 float localY = y + mScrollY - child.mTop; 2147 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2148 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2149 localXY[0] = localX; 2150 localXY[1] = localY; 2151 child.getInverseMatrix().mapPoints(localXY); 2152 localX = localXY[0]; 2153 localY = localXY[1]; 2154 } 2155 final boolean isInView = child.pointInView(localX, localY); 2156 if (isInView && outLocalPoint != null) { 2157 outLocalPoint.set(localX, localY); 2158 } 2159 return isInView; 2160 } 2161 2162 /** 2163 * Transforms a motion event into the coordinate space of a particular child view, 2164 * filters out irrelevant pointer ids, and overrides its action if necessary. 2165 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2166 */ 2167 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2168 View child, int desiredPointerIdBits) { 2169 final boolean handled; 2170 2171 // Canceling motions is a special case. We don't need to perform any transformations 2172 // or filtering. The important part is the action, not the contents. 2173 final int oldAction = event.getAction(); 2174 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2175 event.setAction(MotionEvent.ACTION_CANCEL); 2176 if (child == null) { 2177 handled = super.dispatchTouchEvent(event); 2178 } else { 2179 handled = child.dispatchTouchEvent(event); 2180 } 2181 event.setAction(oldAction); 2182 return handled; 2183 } 2184 2185 // Calculate the number of pointers to deliver. 2186 final int oldPointerIdBits = event.getPointerIdBits(); 2187 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2188 2189 // If for some reason we ended up in an inconsistent state where it looks like we 2190 // might produce a motion event with no pointers in it, then drop the event. 2191 if (newPointerIdBits == 0) { 2192 return false; 2193 } 2194 2195 // If the number of pointers is the same and we don't need to perform any fancy 2196 // irreversible transformations, then we can reuse the motion event for this 2197 // dispatch as long as we are careful to revert any changes we make. 2198 // Otherwise we need to make a copy. 2199 final MotionEvent transformedEvent; 2200 if (newPointerIdBits == oldPointerIdBits) { 2201 if (child == null || child.hasIdentityMatrix()) { 2202 if (child == null) { 2203 handled = super.dispatchTouchEvent(event); 2204 } else { 2205 final float offsetX = mScrollX - child.mLeft; 2206 final float offsetY = mScrollY - child.mTop; 2207 event.offsetLocation(offsetX, offsetY); 2208 2209 handled = child.dispatchTouchEvent(event); 2210 2211 event.offsetLocation(-offsetX, -offsetY); 2212 } 2213 return handled; 2214 } 2215 transformedEvent = MotionEvent.obtain(event); 2216 } else { 2217 transformedEvent = event.split(newPointerIdBits); 2218 } 2219 2220 // Perform any necessary transformations and dispatch. 2221 if (child == null) { 2222 handled = super.dispatchTouchEvent(transformedEvent); 2223 } else { 2224 final float offsetX = mScrollX - child.mLeft; 2225 final float offsetY = mScrollY - child.mTop; 2226 transformedEvent.offsetLocation(offsetX, offsetY); 2227 if (! child.hasIdentityMatrix()) { 2228 transformedEvent.transform(child.getInverseMatrix()); 2229 } 2230 2231 handled = child.dispatchTouchEvent(transformedEvent); 2232 } 2233 2234 // Done. 2235 transformedEvent.recycle(); 2236 return handled; 2237 } 2238 2239 /** 2240 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2241 * dispatch. This behavior is enabled by default for applications that target an 2242 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2243 * 2244 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2245 * views depending on where each pointer initially went down. This allows for user interactions 2246 * such as scrolling two panes of content independently, chording of buttons, and performing 2247 * independent gestures on different pieces of content. 2248 * 2249 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2250 * child views. <code>false</code> to only allow one child view to be the target of 2251 * any MotionEvent received by this ViewGroup. 2252 */ 2253 public void setMotionEventSplittingEnabled(boolean split) { 2254 // TODO Applications really shouldn't change this setting mid-touch event, 2255 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2256 // with gestures in progress when this is changed. 2257 if (split) { 2258 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2259 } else { 2260 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2261 } 2262 } 2263 2264 /** 2265 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2266 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2267 */ 2268 public boolean isMotionEventSplittingEnabled() { 2269 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2270 } 2271 2272 /** 2273 * {@inheritDoc} 2274 */ 2275 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2276 2277 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2278 // We're already in this state, assume our ancestors are too 2279 return; 2280 } 2281 2282 if (disallowIntercept) { 2283 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2284 } else { 2285 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2286 } 2287 2288 // Pass it up to our parent 2289 if (mParent != null) { 2290 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2291 } 2292 } 2293 2294 /** 2295 * Implement this method to intercept all touch screen motion events. This 2296 * allows you to watch events as they are dispatched to your children, and 2297 * take ownership of the current gesture at any point. 2298 * 2299 * <p>Using this function takes some care, as it has a fairly complicated 2300 * interaction with {@link View#onTouchEvent(MotionEvent) 2301 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2302 * that method as well as this one in the correct way. Events will be 2303 * received in the following order: 2304 * 2305 * <ol> 2306 * <li> You will receive the down event here. 2307 * <li> The down event will be handled either by a child of this view 2308 * group, or given to your own onTouchEvent() method to handle; this means 2309 * you should implement onTouchEvent() to return true, so you will 2310 * continue to see the rest of the gesture (instead of looking for 2311 * a parent view to handle it). Also, by returning true from 2312 * onTouchEvent(), you will not receive any following 2313 * events in onInterceptTouchEvent() and all touch processing must 2314 * happen in onTouchEvent() like normal. 2315 * <li> For as long as you return false from this function, each following 2316 * event (up to and including the final up) will be delivered first here 2317 * and then to the target's onTouchEvent(). 2318 * <li> If you return true from here, you will not receive any 2319 * following events: the target view will receive the same event but 2320 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2321 * events will be delivered to your onTouchEvent() method and no longer 2322 * appear here. 2323 * </ol> 2324 * 2325 * @param ev The motion event being dispatched down the hierarchy. 2326 * @return Return true to steal motion events from the children and have 2327 * them dispatched to this ViewGroup through onTouchEvent(). 2328 * The current target will receive an ACTION_CANCEL event, and no further 2329 * messages will be delivered here. 2330 */ 2331 public boolean onInterceptTouchEvent(MotionEvent ev) { 2332 return false; 2333 } 2334 2335 /** 2336 * {@inheritDoc} 2337 * 2338 * Looks for a view to give focus to respecting the setting specified by 2339 * {@link #getDescendantFocusability()}. 2340 * 2341 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2342 * find focus within the children of this group when appropriate. 2343 * 2344 * @see #FOCUS_BEFORE_DESCENDANTS 2345 * @see #FOCUS_AFTER_DESCENDANTS 2346 * @see #FOCUS_BLOCK_DESCENDANTS 2347 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2348 */ 2349 @Override 2350 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2351 if (DBG) { 2352 System.out.println(this + " ViewGroup.requestFocus direction=" 2353 + direction); 2354 } 2355 int descendantFocusability = getDescendantFocusability(); 2356 2357 switch (descendantFocusability) { 2358 case FOCUS_BLOCK_DESCENDANTS: 2359 return super.requestFocus(direction, previouslyFocusedRect); 2360 case FOCUS_BEFORE_DESCENDANTS: { 2361 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2362 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2363 } 2364 case FOCUS_AFTER_DESCENDANTS: { 2365 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2366 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2367 } 2368 default: 2369 throw new IllegalStateException("descendant focusability must be " 2370 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2371 + "but is " + descendantFocusability); 2372 } 2373 } 2374 2375 /** 2376 * Look for a descendant to call {@link View#requestFocus} on. 2377 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2378 * when it wants to request focus within its children. Override this to 2379 * customize how your {@link ViewGroup} requests focus within its children. 2380 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2381 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2382 * to give a finer grained hint about where focus is coming from. May be null 2383 * if there is no hint. 2384 * @return Whether focus was taken. 2385 */ 2386 @SuppressWarnings({"ConstantConditions"}) 2387 protected boolean onRequestFocusInDescendants(int direction, 2388 Rect previouslyFocusedRect) { 2389 int index; 2390 int increment; 2391 int end; 2392 int count = mChildrenCount; 2393 if ((direction & FOCUS_FORWARD) != 0) { 2394 index = 0; 2395 increment = 1; 2396 end = count; 2397 } else { 2398 index = count - 1; 2399 increment = -1; 2400 end = -1; 2401 } 2402 final View[] children = mChildren; 2403 for (int i = index; i != end; i += increment) { 2404 View child = children[i]; 2405 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2406 if (child.requestFocus(direction, previouslyFocusedRect)) { 2407 return true; 2408 } 2409 } 2410 } 2411 return false; 2412 } 2413 2414 /** 2415 * {@inheritDoc} 2416 * 2417 * @hide 2418 */ 2419 @Override 2420 public void dispatchStartTemporaryDetach() { 2421 super.dispatchStartTemporaryDetach(); 2422 final int count = mChildrenCount; 2423 final View[] children = mChildren; 2424 for (int i = 0; i < count; i++) { 2425 children[i].dispatchStartTemporaryDetach(); 2426 } 2427 } 2428 2429 /** 2430 * {@inheritDoc} 2431 * 2432 * @hide 2433 */ 2434 @Override 2435 public void dispatchFinishTemporaryDetach() { 2436 super.dispatchFinishTemporaryDetach(); 2437 final int count = mChildrenCount; 2438 final View[] children = mChildren; 2439 for (int i = 0; i < count; i++) { 2440 children[i].dispatchFinishTemporaryDetach(); 2441 } 2442 } 2443 2444 /** 2445 * {@inheritDoc} 2446 */ 2447 @Override 2448 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2449 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2450 super.dispatchAttachedToWindow(info, visibility); 2451 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2452 2453 final int count = mChildrenCount; 2454 final View[] children = mChildren; 2455 for (int i = 0; i < count; i++) { 2456 final View child = children[i]; 2457 child.dispatchAttachedToWindow(info, 2458 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2459 } 2460 } 2461 2462 @Override 2463 void dispatchScreenStateChanged(int screenState) { 2464 super.dispatchScreenStateChanged(screenState); 2465 2466 final int count = mChildrenCount; 2467 final View[] children = mChildren; 2468 for (int i = 0; i < count; i++) { 2469 children[i].dispatchScreenStateChanged(screenState); 2470 } 2471 } 2472 2473 @Override 2474 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2475 boolean handled = false; 2476 if (includeForAccessibility()) { 2477 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2478 if (handled) { 2479 return handled; 2480 } 2481 } 2482 // Let our children have a shot in populating the event. 2483 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2484 try { 2485 final int childCount = children.getChildCount(); 2486 for (int i = 0; i < childCount; i++) { 2487 View child = children.getChildAt(i); 2488 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2489 handled = child.dispatchPopulateAccessibilityEvent(event); 2490 if (handled) { 2491 return handled; 2492 } 2493 } 2494 } 2495 } finally { 2496 children.recycle(); 2497 } 2498 return false; 2499 } 2500 2501 @Override 2502 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2503 super.onInitializeAccessibilityNodeInfoInternal(info); 2504 if (mAttachInfo != null) { 2505 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2506 childrenForAccessibility.clear(); 2507 addChildrenForAccessibility(childrenForAccessibility); 2508 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2509 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2510 View child = childrenForAccessibility.get(i); 2511 info.addChild(child); 2512 } 2513 childrenForAccessibility.clear(); 2514 } 2515 } 2516 2517 @Override 2518 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2519 super.onInitializeAccessibilityEventInternal(event); 2520 event.setClassName(ViewGroup.class.getName()); 2521 } 2522 2523 /** 2524 * @hide 2525 */ 2526 @Override 2527 public void childAccessibilityStateChanged(View root) { 2528 if (mParent != null) { 2529 mParent.childAccessibilityStateChanged(root); 2530 } 2531 } 2532 2533 @Override 2534 void resetSubtreeAccessibilityStateChanged() { 2535 super.resetSubtreeAccessibilityStateChanged(); 2536 View[] children = mChildren; 2537 final int childCount = mChildrenCount; 2538 for (int i = 0; i < childCount; i++) { 2539 children[i].resetSubtreeAccessibilityStateChanged(); 2540 } 2541 } 2542 2543 /** 2544 * {@inheritDoc} 2545 */ 2546 @Override 2547 void dispatchDetachedFromWindow() { 2548 // If we still have a touch target, we are still in the process of 2549 // dispatching motion events to a child; we need to get rid of that 2550 // child to avoid dispatching events to it after the window is torn 2551 // down. To make sure we keep the child in a consistent state, we 2552 // first send it an ACTION_CANCEL motion event. 2553 cancelAndClearTouchTargets(null); 2554 2555 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2556 exitHoverTargets(); 2557 2558 // In case view is detached while transition is running 2559 mLayoutCalledWhileSuppressed = false; 2560 2561 // Tear down our drag tracking 2562 mDragNotifiedChildren = null; 2563 if (mCurrentDrag != null) { 2564 mCurrentDrag.recycle(); 2565 mCurrentDrag = null; 2566 } 2567 2568 final int count = mChildrenCount; 2569 final View[] children = mChildren; 2570 for (int i = 0; i < count; i++) { 2571 children[i].dispatchDetachedFromWindow(); 2572 } 2573 super.dispatchDetachedFromWindow(); 2574 } 2575 2576 /** 2577 * @hide 2578 */ 2579 @Override 2580 protected void internalSetPadding(int left, int top, int right, int bottom) { 2581 super.internalSetPadding(left, top, right, bottom); 2582 2583 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2584 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2585 } else { 2586 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2587 } 2588 } 2589 2590 /** 2591 * {@inheritDoc} 2592 */ 2593 @Override 2594 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2595 super.dispatchSaveInstanceState(container); 2596 final int count = mChildrenCount; 2597 final View[] children = mChildren; 2598 for (int i = 0; i < count; i++) { 2599 View c = children[i]; 2600 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2601 c.dispatchSaveInstanceState(container); 2602 } 2603 } 2604 } 2605 2606 /** 2607 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2608 * to only this view, not to its children. For use when overriding 2609 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2610 * subclasses to freeze their own state but not the state of their children. 2611 * 2612 * @param container the container 2613 */ 2614 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2615 super.dispatchSaveInstanceState(container); 2616 } 2617 2618 /** 2619 * {@inheritDoc} 2620 */ 2621 @Override 2622 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2623 super.dispatchRestoreInstanceState(container); 2624 final int count = mChildrenCount; 2625 final View[] children = mChildren; 2626 for (int i = 0; i < count; i++) { 2627 View c = children[i]; 2628 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2629 c.dispatchRestoreInstanceState(container); 2630 } 2631 } 2632 } 2633 2634 /** 2635 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2636 * to only this view, not to its children. For use when overriding 2637 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2638 * subclasses to thaw their own state but not the state of their children. 2639 * 2640 * @param container the container 2641 */ 2642 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2643 super.dispatchRestoreInstanceState(container); 2644 } 2645 2646 /** 2647 * Enables or disables the drawing cache for each child of this view group. 2648 * 2649 * @param enabled true to enable the cache, false to dispose of it 2650 */ 2651 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2652 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2653 final View[] children = mChildren; 2654 final int count = mChildrenCount; 2655 for (int i = 0; i < count; i++) { 2656 children[i].setDrawingCacheEnabled(enabled); 2657 } 2658 } 2659 } 2660 2661 @Override 2662 protected void onAnimationStart() { 2663 super.onAnimationStart(); 2664 2665 // When this ViewGroup's animation starts, build the cache for the children 2666 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2667 final int count = mChildrenCount; 2668 final View[] children = mChildren; 2669 final boolean buildCache = !isHardwareAccelerated(); 2670 2671 for (int i = 0; i < count; i++) { 2672 final View child = children[i]; 2673 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2674 child.setDrawingCacheEnabled(true); 2675 if (buildCache) { 2676 child.buildDrawingCache(true); 2677 } 2678 } 2679 } 2680 2681 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2682 } 2683 } 2684 2685 @Override 2686 protected void onAnimationEnd() { 2687 super.onAnimationEnd(); 2688 2689 // When this ViewGroup's animation ends, destroy the cache of the children 2690 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2691 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2692 2693 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2694 setChildrenDrawingCacheEnabled(false); 2695 } 2696 } 2697 } 2698 2699 @Override 2700 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2701 int count = mChildrenCount; 2702 int[] visibilities = null; 2703 2704 if (skipChildren) { 2705 visibilities = new int[count]; 2706 for (int i = 0; i < count; i++) { 2707 View child = getChildAt(i); 2708 visibilities[i] = child.getVisibility(); 2709 if (visibilities[i] == View.VISIBLE) { 2710 child.setVisibility(INVISIBLE); 2711 } 2712 } 2713 } 2714 2715 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2716 2717 if (skipChildren) { 2718 for (int i = 0; i < count; i++) { 2719 getChildAt(i).setVisibility(visibilities[i]); 2720 } 2721 } 2722 2723 return b; 2724 } 2725 2726 /** Return true if this ViewGroup is laying out using optical bounds. */ 2727 boolean isLayoutModeOptical() { 2728 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2729 } 2730 2731 Insets computeOpticalInsets() { 2732 if (isLayoutModeOptical()) { 2733 int left = 0; 2734 int top = 0; 2735 int right = 0; 2736 int bottom = 0; 2737 for (int i = 0; i < mChildrenCount; i++) { 2738 View child = getChildAt(i); 2739 if (child.getVisibility() == VISIBLE) { 2740 Insets insets = child.getOpticalInsets(); 2741 left = Math.max(left, insets.left); 2742 top = Math.max(top, insets.top); 2743 right = Math.max(right, insets.right); 2744 bottom = Math.max(bottom, insets.bottom); 2745 } 2746 } 2747 return Insets.of(left, top, right, bottom); 2748 } else { 2749 return Insets.NONE; 2750 } 2751 } 2752 2753 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2754 if (x1 != x2 && y1 != y2) { 2755 if (x1 > x2) { 2756 int tmp = x1; x1 = x2; x2 = tmp; 2757 } 2758 if (y1 > y2) { 2759 int tmp = y1; y1 = y2; y2 = tmp; 2760 } 2761 canvas.drawRect(x1, y1, x2, y2, paint); 2762 } 2763 } 2764 2765 private static int sign(int x) { 2766 return (x >= 0) ? 1 : -1; 2767 } 2768 2769 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2770 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2771 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2772 } 2773 2774 private int dipsToPixels(int dips) { 2775 float scale = getContext().getResources().getDisplayMetrics().density; 2776 return (int) (dips * scale + 0.5f); 2777 } 2778 2779 private void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2780 int lineLength, int lineWidth) { 2781 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2782 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2783 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2784 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2785 } 2786 2787 private static void fillDifference(Canvas canvas, 2788 int x2, int y2, int x3, int y3, 2789 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2790 int x1 = x2 - dx1; 2791 int y1 = y2 - dy1; 2792 2793 int x4 = x3 + dx2; 2794 int y4 = y3 + dy2; 2795 2796 fillRect(canvas, paint, x1, y1, x4, y2); 2797 fillRect(canvas, paint, x1, y2, x2, y3); 2798 fillRect(canvas, paint, x3, y2, x4, y3); 2799 fillRect(canvas, paint, x1, y3, x4, y4); 2800 } 2801 2802 /** 2803 * @hide 2804 */ 2805 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2806 for (int i = 0; i < getChildCount(); i++) { 2807 View c = getChildAt(i); 2808 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2809 } 2810 } 2811 2812 /** 2813 * @hide 2814 */ 2815 protected void onDebugDraw(Canvas canvas) { 2816 Paint paint = getDebugPaint(); 2817 2818 // Draw optical bounds 2819 { 2820 paint.setColor(Color.RED); 2821 paint.setStyle(Paint.Style.STROKE); 2822 2823 for (int i = 0; i < getChildCount(); i++) { 2824 View c = getChildAt(i); 2825 Insets insets = c.getOpticalInsets(); 2826 2827 drawRect(canvas, paint, 2828 c.getLeft() + insets.left, 2829 c.getTop() + insets.top, 2830 c.getRight() - insets.right - 1, 2831 c.getBottom() - insets.bottom - 1); 2832 } 2833 } 2834 2835 // Draw margins 2836 { 2837 paint.setColor(Color.argb(63, 255, 0, 255)); 2838 paint.setStyle(Paint.Style.FILL); 2839 2840 onDebugDrawMargins(canvas, paint); 2841 } 2842 2843 // Draw clip bounds 2844 { 2845 paint.setColor(Color.rgb(63, 127, 255)); 2846 paint.setStyle(Paint.Style.FILL); 2847 2848 int lineLength = dipsToPixels(8); 2849 int lineWidth = dipsToPixels(1); 2850 for (int i = 0; i < getChildCount(); i++) { 2851 View c = getChildAt(i); 2852 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2853 paint, lineLength, lineWidth); 2854 } 2855 } 2856 } 2857 2858 /** 2859 * {@inheritDoc} 2860 */ 2861 @Override 2862 protected void dispatchDraw(Canvas canvas) { 2863 final int count = mChildrenCount; 2864 final View[] children = mChildren; 2865 int flags = mGroupFlags; 2866 2867 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2868 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2869 2870 final boolean buildCache = !isHardwareAccelerated(); 2871 for (int i = 0; i < count; i++) { 2872 final View child = children[i]; 2873 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2874 final LayoutParams params = child.getLayoutParams(); 2875 attachLayoutAnimationParameters(child, params, i, count); 2876 bindLayoutAnimation(child); 2877 if (cache) { 2878 child.setDrawingCacheEnabled(true); 2879 if (buildCache) { 2880 child.buildDrawingCache(true); 2881 } 2882 } 2883 } 2884 } 2885 2886 final LayoutAnimationController controller = mLayoutAnimationController; 2887 if (controller.willOverlap()) { 2888 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2889 } 2890 2891 controller.start(); 2892 2893 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2894 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2895 2896 if (cache) { 2897 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2898 } 2899 2900 if (mAnimationListener != null) { 2901 mAnimationListener.onAnimationStart(controller.getAnimation()); 2902 } 2903 } 2904 2905 int saveCount = 0; 2906 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2907 if (clipToPadding) { 2908 saveCount = canvas.save(); 2909 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2910 mScrollX + mRight - mLeft - mPaddingRight, 2911 mScrollY + mBottom - mTop - mPaddingBottom); 2912 2913 } 2914 2915 // We will draw our child's animation, let's reset the flag 2916 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2917 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2918 2919 boolean more = false; 2920 final long drawingTime = getDrawingTime(); 2921 2922 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2923 for (int i = 0; i < count; i++) { 2924 final View child = children[i]; 2925 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2926 more |= drawChild(canvas, child, drawingTime); 2927 } 2928 } 2929 } else { 2930 for (int i = 0; i < count; i++) { 2931 final View child = children[getChildDrawingOrder(count, i)]; 2932 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2933 more |= drawChild(canvas, child, drawingTime); 2934 } 2935 } 2936 } 2937 2938 // Draw any disappearing views that have animations 2939 if (mDisappearingChildren != null) { 2940 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2941 final int disappearingCount = disappearingChildren.size() - 1; 2942 // Go backwards -- we may delete as animations finish 2943 for (int i = disappearingCount; i >= 0; i--) { 2944 final View child = disappearingChildren.get(i); 2945 more |= drawChild(canvas, child, drawingTime); 2946 } 2947 } 2948 2949 if (debugDraw()) { 2950 onDebugDraw(canvas); 2951 } 2952 2953 if (clipToPadding) { 2954 canvas.restoreToCount(saveCount); 2955 } 2956 2957 // mGroupFlags might have been updated by drawChild() 2958 flags = mGroupFlags; 2959 2960 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2961 invalidate(true); 2962 } 2963 2964 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2965 mLayoutAnimationController.isDone() && !more) { 2966 // We want to erase the drawing cache and notify the listener after the 2967 // next frame is drawn because one extra invalidate() is caused by 2968 // drawChild() after the animation is over 2969 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2970 final Runnable end = new Runnable() { 2971 public void run() { 2972 notifyAnimationListener(); 2973 } 2974 }; 2975 post(end); 2976 } 2977 } 2978 2979 /** 2980 * Returns the ViewGroupOverlay for this view group, creating it if it does 2981 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 2982 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 2983 * views, like overlay drawables, are visual-only; they do not receive input 2984 * events and should not be used as anything other than a temporary 2985 * representation of a view in a parent container, such as might be used 2986 * by an animation effect. 2987 * 2988 * <p>Note: Overlays do not currently work correctly with {@link 2989 * SurfaceView} or {@link TextureView}; contents in overlays for these 2990 * types of views may not display correctly.</p> 2991 * 2992 * @return The ViewGroupOverlay object for this view. 2993 * @see ViewGroupOverlay 2994 */ 2995 @Override 2996 public ViewGroupOverlay getOverlay() { 2997 if (mOverlay == null) { 2998 mOverlay = new ViewGroupOverlay(mContext, this); 2999 } 3000 return (ViewGroupOverlay) mOverlay; 3001 } 3002 3003 /** 3004 * Returns the index of the child to draw for this iteration. Override this 3005 * if you want to change the drawing order of children. By default, it 3006 * returns i. 3007 * <p> 3008 * NOTE: In order for this method to be called, you must enable child ordering 3009 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3010 * 3011 * @param i The current iteration. 3012 * @return The index of the child to draw this iteration. 3013 * 3014 * @see #setChildrenDrawingOrderEnabled(boolean) 3015 * @see #isChildrenDrawingOrderEnabled() 3016 */ 3017 protected int getChildDrawingOrder(int childCount, int i) { 3018 return i; 3019 } 3020 3021 private void notifyAnimationListener() { 3022 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3023 mGroupFlags |= FLAG_ANIMATION_DONE; 3024 3025 if (mAnimationListener != null) { 3026 final Runnable end = new Runnable() { 3027 public void run() { 3028 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3029 } 3030 }; 3031 post(end); 3032 } 3033 3034 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3035 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3036 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3037 setChildrenDrawingCacheEnabled(false); 3038 } 3039 } 3040 3041 invalidate(true); 3042 } 3043 3044 /** 3045 * This method is used to cause children of this ViewGroup to restore or recreate their 3046 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3047 * to recreate its own display list, which would happen if it went through the normal 3048 * draw/dispatchDraw mechanisms. 3049 * 3050 * @hide 3051 */ 3052 @Override 3053 protected void dispatchGetDisplayList() { 3054 final int count = mChildrenCount; 3055 final View[] children = mChildren; 3056 for (int i = 0; i < count; i++) { 3057 final View child = children[i]; 3058 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3059 child.hasStaticLayer()) { 3060 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3061 == PFLAG_INVALIDATED; 3062 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3063 child.getDisplayList(); 3064 child.mRecreateDisplayList = false; 3065 } 3066 } 3067 if (mOverlay != null) { 3068 View overlayView = mOverlay.getOverlayView(); 3069 overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) 3070 == PFLAG_INVALIDATED; 3071 overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; 3072 overlayView.getDisplayList(); 3073 overlayView.mRecreateDisplayList = false; 3074 } 3075 } 3076 3077 /** 3078 * Draw one child of this View Group. This method is responsible for getting 3079 * the canvas in the right state. This includes clipping, translating so 3080 * that the child's scrolled origin is at 0, 0, and applying any animation 3081 * transformations. 3082 * 3083 * @param canvas The canvas on which to draw the child 3084 * @param child Who to draw 3085 * @param drawingTime The time at which draw is occurring 3086 * @return True if an invalidate() was issued 3087 */ 3088 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3089 return child.draw(canvas, this, drawingTime); 3090 } 3091 3092 /** 3093 * Returns whether ths group's children are clipped to their bounds before drawing. 3094 * The default value is true. 3095 * @see #setClipChildren(boolean) 3096 * 3097 * @return True if the group's children will be clipped to their bounds, 3098 * false otherwise. 3099 */ 3100 public boolean getClipChildren() { 3101 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3102 } 3103 3104 /** 3105 * By default, children are clipped to their bounds before drawing. This 3106 * allows view groups to override this behavior for animations, etc. 3107 * 3108 * @param clipChildren true to clip children to their bounds, 3109 * false otherwise 3110 * @attr ref android.R.styleable#ViewGroup_clipChildren 3111 */ 3112 public void setClipChildren(boolean clipChildren) { 3113 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3114 if (clipChildren != previousValue) { 3115 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3116 for (int i = 0; i < mChildrenCount; ++i) { 3117 View child = getChildAt(i); 3118 if (child.mDisplayList != null) { 3119 child.mDisplayList.setClipToBounds(clipChildren); 3120 } 3121 } 3122 } 3123 } 3124 3125 /** 3126 * By default, children are clipped to the padding of the ViewGroup. This 3127 * allows view groups to override this behavior 3128 * 3129 * @param clipToPadding true to clip children to the padding of the 3130 * group, false otherwise 3131 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3132 */ 3133 public void setClipToPadding(boolean clipToPadding) { 3134 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3135 } 3136 3137 /** 3138 * {@inheritDoc} 3139 */ 3140 @Override 3141 public void dispatchSetSelected(boolean selected) { 3142 final View[] children = mChildren; 3143 final int count = mChildrenCount; 3144 for (int i = 0; i < count; i++) { 3145 children[i].setSelected(selected); 3146 } 3147 } 3148 3149 /** 3150 * {@inheritDoc} 3151 */ 3152 @Override 3153 public void dispatchSetActivated(boolean activated) { 3154 final View[] children = mChildren; 3155 final int count = mChildrenCount; 3156 for (int i = 0; i < count; i++) { 3157 children[i].setActivated(activated); 3158 } 3159 } 3160 3161 @Override 3162 protected void dispatchSetPressed(boolean pressed) { 3163 final View[] children = mChildren; 3164 final int count = mChildrenCount; 3165 for (int i = 0; i < count; i++) { 3166 final View child = children[i]; 3167 // Children that are clickable on their own should not 3168 // show a pressed state when their parent view does. 3169 // Clearing a pressed state always propagates. 3170 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3171 child.setPressed(pressed); 3172 } 3173 } 3174 } 3175 3176 /** 3177 * When this property is set to true, this ViewGroup supports static transformations on 3178 * children; this causes 3179 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3180 * invoked when a child is drawn. 3181 * 3182 * Any subclass overriding 3183 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3184 * set this property to true. 3185 * 3186 * @param enabled True to enable static transformations on children, false otherwise. 3187 * 3188 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3189 */ 3190 protected void setStaticTransformationsEnabled(boolean enabled) { 3191 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3192 } 3193 3194 /** 3195 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3196 * boolean to indicate whether a static transform was set. The default implementation 3197 * simply returns <code>false</code>; subclasses may override this method for different 3198 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3199 * for this method to be called. 3200 * 3201 * @param child The child view whose static transform is being requested 3202 * @param t The Transformation which will hold the result 3203 * @return true if the transformation was set, false otherwise 3204 * @see #setStaticTransformationsEnabled(boolean) 3205 */ 3206 protected boolean getChildStaticTransformation(View child, Transformation t) { 3207 return false; 3208 } 3209 3210 /** 3211 * {@hide} 3212 */ 3213 @Override 3214 protected View findViewTraversal(int id) { 3215 if (id == mID) { 3216 return this; 3217 } 3218 3219 final View[] where = mChildren; 3220 final int len = mChildrenCount; 3221 3222 for (int i = 0; i < len; i++) { 3223 View v = where[i]; 3224 3225 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3226 v = v.findViewById(id); 3227 3228 if (v != null) { 3229 return v; 3230 } 3231 } 3232 } 3233 3234 return null; 3235 } 3236 3237 /** 3238 * {@hide} 3239 */ 3240 @Override 3241 protected View findViewWithTagTraversal(Object tag) { 3242 if (tag != null && tag.equals(mTag)) { 3243 return this; 3244 } 3245 3246 final View[] where = mChildren; 3247 final int len = mChildrenCount; 3248 3249 for (int i = 0; i < len; i++) { 3250 View v = where[i]; 3251 3252 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3253 v = v.findViewWithTag(tag); 3254 3255 if (v != null) { 3256 return v; 3257 } 3258 } 3259 } 3260 3261 return null; 3262 } 3263 3264 /** 3265 * {@hide} 3266 */ 3267 @Override 3268 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3269 if (predicate.apply(this)) { 3270 return this; 3271 } 3272 3273 final View[] where = mChildren; 3274 final int len = mChildrenCount; 3275 3276 for (int i = 0; i < len; i++) { 3277 View v = where[i]; 3278 3279 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3280 v = v.findViewByPredicate(predicate); 3281 3282 if (v != null) { 3283 return v; 3284 } 3285 } 3286 } 3287 3288 return null; 3289 } 3290 3291 /** 3292 * <p>Adds a child view. If no layout parameters are already set on the child, the 3293 * default parameters for this ViewGroup are set on the child.</p> 3294 * 3295 * <p><strong>Note:</strong> do not invoke this method from 3296 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3297 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3298 * 3299 * @param child the child view to add 3300 * 3301 * @see #generateDefaultLayoutParams() 3302 */ 3303 public void addView(View child) { 3304 addView(child, -1); 3305 } 3306 3307 /** 3308 * Adds a child view. If no layout parameters are already set on the child, the 3309 * default parameters for this ViewGroup are set on the child. 3310 * 3311 * <p><strong>Note:</strong> do not invoke this method from 3312 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3313 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3314 * 3315 * @param child the child view to add 3316 * @param index the position at which to add the child 3317 * 3318 * @see #generateDefaultLayoutParams() 3319 */ 3320 public void addView(View child, int index) { 3321 LayoutParams params = child.getLayoutParams(); 3322 if (params == null) { 3323 params = generateDefaultLayoutParams(); 3324 if (params == null) { 3325 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3326 } 3327 } 3328 addView(child, index, params); 3329 } 3330 3331 /** 3332 * Adds a child view with this ViewGroup's default layout parameters and the 3333 * specified width and height. 3334 * 3335 * <p><strong>Note:</strong> do not invoke this method from 3336 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3337 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3338 * 3339 * @param child the child view to add 3340 */ 3341 public void addView(View child, int width, int height) { 3342 final LayoutParams params = generateDefaultLayoutParams(); 3343 params.width = width; 3344 params.height = height; 3345 addView(child, -1, params); 3346 } 3347 3348 /** 3349 * Adds a child view with the specified layout parameters. 3350 * 3351 * <p><strong>Note:</strong> do not invoke this method from 3352 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3353 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3354 * 3355 * @param child the child view to add 3356 * @param params the layout parameters to set on the child 3357 */ 3358 public void addView(View child, LayoutParams params) { 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 index the position at which to add the child 3371 * @param params the layout parameters to set on the child 3372 */ 3373 public void addView(View child, int index, LayoutParams params) { 3374 if (DBG) { 3375 System.out.println(this + " addView"); 3376 } 3377 3378 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3379 // therefore, we call requestLayout() on ourselves before, so that the child's request 3380 // will be blocked at our level 3381 requestLayout(); 3382 invalidate(true); 3383 addViewInner(child, index, params, false); 3384 } 3385 3386 /** 3387 * {@inheritDoc} 3388 */ 3389 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3390 if (!checkLayoutParams(params)) { 3391 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3392 } 3393 if (view.mParent != this) { 3394 throw new IllegalArgumentException("Given view not a child of " + this); 3395 } 3396 view.setLayoutParams(params); 3397 } 3398 3399 /** 3400 * {@inheritDoc} 3401 */ 3402 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3403 return p != null; 3404 } 3405 3406 /** 3407 * Interface definition for a callback to be invoked when the hierarchy 3408 * within this view changed. The hierarchy changes whenever a child is added 3409 * to or removed from this view. 3410 */ 3411 public interface OnHierarchyChangeListener { 3412 /** 3413 * Called when a new child is added to a parent view. 3414 * 3415 * @param parent the view in which a child was added 3416 * @param child the new child view added in the hierarchy 3417 */ 3418 void onChildViewAdded(View parent, View child); 3419 3420 /** 3421 * Called when a child is removed from a parent view. 3422 * 3423 * @param parent the view from which the child was removed 3424 * @param child the child removed from the hierarchy 3425 */ 3426 void onChildViewRemoved(View parent, View child); 3427 } 3428 3429 /** 3430 * Register a callback to be invoked when a child is added to or removed 3431 * from this view. 3432 * 3433 * @param listener the callback to invoke on hierarchy change 3434 */ 3435 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3436 mOnHierarchyChangeListener = listener; 3437 } 3438 3439 /** 3440 * @hide 3441 */ 3442 protected void onViewAdded(View child) { 3443 if (mOnHierarchyChangeListener != null) { 3444 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3445 } 3446 } 3447 3448 /** 3449 * @hide 3450 */ 3451 protected void onViewRemoved(View child) { 3452 if (mOnHierarchyChangeListener != null) { 3453 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3454 } 3455 } 3456 3457 private void clearCachedLayoutMode() { 3458 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3459 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3460 } 3461 } 3462 3463 @Override 3464 protected void onAttachedToWindow() { 3465 super.onAttachedToWindow(); 3466 clearCachedLayoutMode(); 3467 } 3468 3469 @Override 3470 protected void onDetachedFromWindow() { 3471 super.onDetachedFromWindow(); 3472 clearCachedLayoutMode(); 3473 } 3474 3475 /** 3476 * Adds a view during layout. This is useful if in your onLayout() method, 3477 * you need to add more views (as does the list view for example). 3478 * 3479 * If index is negative, it means put it at the end of the list. 3480 * 3481 * @param child the view to add to the group 3482 * @param index the index at which the child must be added 3483 * @param params the layout parameters to associate with the child 3484 * @return true if the child was added, false otherwise 3485 */ 3486 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3487 return addViewInLayout(child, index, params, false); 3488 } 3489 3490 /** 3491 * Adds a view during layout. This is useful if in your onLayout() method, 3492 * you need to add more views (as does the list view for example). 3493 * 3494 * If index is negative, it means put it at the end of the list. 3495 * 3496 * @param child the view to add to the group 3497 * @param index the index at which the child must be added 3498 * @param params the layout parameters to associate with the child 3499 * @param preventRequestLayout if true, calling this method will not trigger a 3500 * layout request on child 3501 * @return true if the child was added, false otherwise 3502 */ 3503 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3504 boolean preventRequestLayout) { 3505 child.mParent = null; 3506 addViewInner(child, index, params, preventRequestLayout); 3507 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3508 return true; 3509 } 3510 3511 /** 3512 * Prevents the specified child to be laid out during the next layout pass. 3513 * 3514 * @param child the child on which to perform the cleanup 3515 */ 3516 protected void cleanupLayoutState(View child) { 3517 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3518 } 3519 3520 private void addViewInner(View child, int index, LayoutParams params, 3521 boolean preventRequestLayout) { 3522 3523 if (mTransition != null) { 3524 // Don't prevent other add transitions from completing, but cancel remove 3525 // transitions to let them complete the process before we add to the container 3526 mTransition.cancel(LayoutTransition.DISAPPEARING); 3527 } 3528 3529 if (child.getParent() != null) { 3530 throw new IllegalStateException("The specified child already has a parent. " + 3531 "You must call removeView() on the child's parent first."); 3532 } 3533 3534 if (mTransition != null) { 3535 mTransition.addChild(this, child); 3536 } 3537 3538 if (!checkLayoutParams(params)) { 3539 params = generateLayoutParams(params); 3540 } 3541 3542 if (preventRequestLayout) { 3543 child.mLayoutParams = params; 3544 } else { 3545 child.setLayoutParams(params); 3546 } 3547 3548 if (index < 0) { 3549 index = mChildrenCount; 3550 } 3551 3552 addInArray(child, index); 3553 3554 // tell our children 3555 if (preventRequestLayout) { 3556 child.assignParent(this); 3557 } else { 3558 child.mParent = this; 3559 } 3560 3561 if (child.hasFocus()) { 3562 requestChildFocus(child, child.findFocus()); 3563 } 3564 3565 AttachInfo ai = mAttachInfo; 3566 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3567 boolean lastKeepOn = ai.mKeepScreenOn; 3568 ai.mKeepScreenOn = false; 3569 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3570 if (ai.mKeepScreenOn) { 3571 needGlobalAttributesUpdate(true); 3572 } 3573 ai.mKeepScreenOn = lastKeepOn; 3574 } 3575 3576 if (child.isLayoutDirectionInherited()) { 3577 child.resetRtlProperties(); 3578 } 3579 3580 onViewAdded(child); 3581 3582 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3583 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3584 } 3585 3586 if (child.hasTransientState()) { 3587 childHasTransientStateChanged(child, true); 3588 } 3589 3590 if (child.isImportantForAccessibility() && child.getVisibility() != View.GONE) { 3591 childAccessibilityStateChanged(child); 3592 } 3593 } 3594 3595 private void addInArray(View child, int index) { 3596 View[] children = mChildren; 3597 final int count = mChildrenCount; 3598 final int size = children.length; 3599 if (index == count) { 3600 if (size == count) { 3601 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3602 System.arraycopy(children, 0, mChildren, 0, size); 3603 children = mChildren; 3604 } 3605 children[mChildrenCount++] = child; 3606 } else if (index < count) { 3607 if (size == count) { 3608 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3609 System.arraycopy(children, 0, mChildren, 0, index); 3610 System.arraycopy(children, index, mChildren, index + 1, count - index); 3611 children = mChildren; 3612 } else { 3613 System.arraycopy(children, index, children, index + 1, count - index); 3614 } 3615 children[index] = child; 3616 mChildrenCount++; 3617 if (mLastTouchDownIndex >= index) { 3618 mLastTouchDownIndex++; 3619 } 3620 } else { 3621 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3622 } 3623 } 3624 3625 // This method also sets the child's mParent to null 3626 private void removeFromArray(int index) { 3627 final View[] children = mChildren; 3628 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3629 children[index].mParent = null; 3630 } 3631 final int count = mChildrenCount; 3632 if (index == count - 1) { 3633 children[--mChildrenCount] = null; 3634 } else if (index >= 0 && index < count) { 3635 System.arraycopy(children, index + 1, children, index, count - index - 1); 3636 children[--mChildrenCount] = null; 3637 } else { 3638 throw new IndexOutOfBoundsException(); 3639 } 3640 if (mLastTouchDownIndex == index) { 3641 mLastTouchDownTime = 0; 3642 mLastTouchDownIndex = -1; 3643 } else if (mLastTouchDownIndex > index) { 3644 mLastTouchDownIndex--; 3645 } 3646 } 3647 3648 // This method also sets the children's mParent to null 3649 private void removeFromArray(int start, int count) { 3650 final View[] children = mChildren; 3651 final int childrenCount = mChildrenCount; 3652 3653 start = Math.max(0, start); 3654 final int end = Math.min(childrenCount, start + count); 3655 3656 if (start == end) { 3657 return; 3658 } 3659 3660 if (end == childrenCount) { 3661 for (int i = start; i < end; i++) { 3662 children[i].mParent = null; 3663 children[i] = null; 3664 } 3665 } else { 3666 for (int i = start; i < end; i++) { 3667 children[i].mParent = null; 3668 } 3669 3670 // Since we're looping above, we might as well do the copy, but is arraycopy() 3671 // faster than the extra 2 bounds checks we would do in the loop? 3672 System.arraycopy(children, end, children, start, childrenCount - end); 3673 3674 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3675 children[i] = null; 3676 } 3677 } 3678 3679 mChildrenCount -= (end - start); 3680 } 3681 3682 private void bindLayoutAnimation(View child) { 3683 Animation a = mLayoutAnimationController.getAnimationForView(child); 3684 child.setAnimation(a); 3685 } 3686 3687 /** 3688 * Subclasses should override this method to set layout animation 3689 * parameters on the supplied child. 3690 * 3691 * @param child the child to associate with animation parameters 3692 * @param params the child's layout parameters which hold the animation 3693 * parameters 3694 * @param index the index of the child in the view group 3695 * @param count the number of children in the view group 3696 */ 3697 protected void attachLayoutAnimationParameters(View child, 3698 LayoutParams params, int index, int count) { 3699 LayoutAnimationController.AnimationParameters animationParams = 3700 params.layoutAnimationParameters; 3701 if (animationParams == null) { 3702 animationParams = new LayoutAnimationController.AnimationParameters(); 3703 params.layoutAnimationParameters = animationParams; 3704 } 3705 3706 animationParams.count = count; 3707 animationParams.index = index; 3708 } 3709 3710 /** 3711 * {@inheritDoc} 3712 * 3713 * <p><strong>Note:</strong> do not invoke this method from 3714 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3715 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3716 */ 3717 public void removeView(View view) { 3718 removeViewInternal(view); 3719 requestLayout(); 3720 invalidate(true); 3721 } 3722 3723 /** 3724 * Removes a view during layout. This is useful if in your onLayout() method, 3725 * you need to remove more views. 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 * @param view the view to remove from the group 3732 */ 3733 public void removeViewInLayout(View view) { 3734 removeViewInternal(view); 3735 } 3736 3737 /** 3738 * Removes a range of views 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 start the index of the first view to remove from the group 3746 * @param count the number of views to remove from the group 3747 */ 3748 public void removeViewsInLayout(int start, int count) { 3749 removeViewsInternal(start, count); 3750 } 3751 3752 /** 3753 * Removes the view at the specified position in the group. 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 index the position in the group of the view to remove 3760 */ 3761 public void removeViewAt(int index) { 3762 removeViewInternal(index, getChildAt(index)); 3763 requestLayout(); 3764 invalidate(true); 3765 } 3766 3767 /** 3768 * Removes the specified range of views from the group. 3769 * 3770 * <p><strong>Note:</strong> do not invoke this method from 3771 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3772 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3773 * 3774 * @param start the first position in the group of the range of views to remove 3775 * @param count the number of views to remove 3776 */ 3777 public void removeViews(int start, int count) { 3778 removeViewsInternal(start, count); 3779 requestLayout(); 3780 invalidate(true); 3781 } 3782 3783 private void removeViewInternal(View view) { 3784 final int index = indexOfChild(view); 3785 if (index >= 0) { 3786 removeViewInternal(index, view); 3787 } 3788 } 3789 3790 private void removeViewInternal(int index, View view) { 3791 3792 if (mTransition != null) { 3793 mTransition.removeChild(this, view); 3794 } 3795 3796 boolean clearChildFocus = false; 3797 if (view == mFocused) { 3798 view.unFocus(); 3799 clearChildFocus = true; 3800 } 3801 3802 if (view.isAccessibilityFocused()) { 3803 view.clearAccessibilityFocus(); 3804 } 3805 3806 cancelTouchTarget(view); 3807 cancelHoverTarget(view); 3808 3809 if (view.getAnimation() != null || 3810 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3811 addDisappearingView(view); 3812 } else if (view.mAttachInfo != null) { 3813 view.dispatchDetachedFromWindow(); 3814 } 3815 3816 if (view.hasTransientState()) { 3817 childHasTransientStateChanged(view, false); 3818 } 3819 3820 needGlobalAttributesUpdate(false); 3821 3822 removeFromArray(index); 3823 3824 if (clearChildFocus) { 3825 clearChildFocus(view); 3826 if (!rootViewRequestFocus()) { 3827 notifyGlobalFocusCleared(this); 3828 } 3829 } 3830 3831 onViewRemoved(view); 3832 3833 if (view.isImportantForAccessibility() && view.getVisibility() != View.GONE) { 3834 childAccessibilityStateChanged(view); 3835 } 3836 } 3837 3838 /** 3839 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3840 * not null, changes in layout which occur because of children being added to or removed from 3841 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3842 * object. By default, the transition object is null (so layout changes are not animated). 3843 * 3844 * @param transition The LayoutTransition object that will animated changes in layout. A value 3845 * of <code>null</code> means no transition will run on layout changes. 3846 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3847 */ 3848 public void setLayoutTransition(LayoutTransition transition) { 3849 if (mTransition != null) { 3850 mTransition.removeTransitionListener(mLayoutTransitionListener); 3851 } 3852 mTransition = transition; 3853 if (mTransition != null) { 3854 mTransition.addTransitionListener(mLayoutTransitionListener); 3855 } 3856 } 3857 3858 /** 3859 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3860 * not null, changes in layout which occur because of children being added to or removed from 3861 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3862 * object. By default, the transition object is null (so layout changes are not animated). 3863 * 3864 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3865 * A value of <code>null</code> means no transition will run on layout changes. 3866 */ 3867 public LayoutTransition getLayoutTransition() { 3868 return mTransition; 3869 } 3870 3871 private void removeViewsInternal(int start, int count) { 3872 final View focused = mFocused; 3873 final boolean detach = mAttachInfo != null; 3874 boolean clearChildFocus = false; 3875 3876 final View[] children = mChildren; 3877 final int end = start + count; 3878 3879 for (int i = start; i < end; i++) { 3880 final View view = children[i]; 3881 3882 if (mTransition != null) { 3883 mTransition.removeChild(this, view); 3884 } 3885 3886 if (view == focused) { 3887 view.unFocus(); 3888 clearChildFocus = true; 3889 } 3890 3891 if (view.isAccessibilityFocused()) { 3892 view.clearAccessibilityFocus(); 3893 } 3894 3895 cancelTouchTarget(view); 3896 cancelHoverTarget(view); 3897 3898 if (view.getAnimation() != null || 3899 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3900 addDisappearingView(view); 3901 } else if (detach) { 3902 view.dispatchDetachedFromWindow(); 3903 } 3904 3905 if (view.hasTransientState()) { 3906 childHasTransientStateChanged(view, false); 3907 } 3908 3909 needGlobalAttributesUpdate(false); 3910 3911 onViewRemoved(view); 3912 } 3913 3914 removeFromArray(start, count); 3915 3916 if (clearChildFocus) { 3917 clearChildFocus(focused); 3918 if (!rootViewRequestFocus()) { 3919 notifyGlobalFocusCleared(focused); 3920 } 3921 } 3922 } 3923 3924 /** 3925 * Call this method to remove all child views from the 3926 * ViewGroup. 3927 * 3928 * <p><strong>Note:</strong> do not invoke this method from 3929 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3930 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3931 */ 3932 public void removeAllViews() { 3933 removeAllViewsInLayout(); 3934 requestLayout(); 3935 invalidate(true); 3936 } 3937 3938 /** 3939 * Called by a ViewGroup subclass to remove child views from itself, 3940 * when it must first know its size on screen before it can calculate how many 3941 * child views it will render. An example is a Gallery or a ListView, which 3942 * may "have" 50 children, but actually only render the number of children 3943 * that can currently fit inside the object on screen. Do not call 3944 * this method unless you are extending ViewGroup and understand the 3945 * view measuring and layout pipeline. 3946 * 3947 * <p><strong>Note:</strong> do not invoke this method from 3948 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3949 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3950 */ 3951 public void removeAllViewsInLayout() { 3952 final int count = mChildrenCount; 3953 if (count <= 0) { 3954 return; 3955 } 3956 3957 final View[] children = mChildren; 3958 mChildrenCount = 0; 3959 3960 final View focused = mFocused; 3961 final boolean detach = mAttachInfo != null; 3962 boolean clearChildFocus = false; 3963 3964 needGlobalAttributesUpdate(false); 3965 3966 for (int i = count - 1; i >= 0; i--) { 3967 final View view = children[i]; 3968 3969 if (mTransition != null) { 3970 mTransition.removeChild(this, view); 3971 } 3972 3973 if (view == focused) { 3974 view.unFocus(); 3975 clearChildFocus = true; 3976 } 3977 3978 if (view.isAccessibilityFocused()) { 3979 view.clearAccessibilityFocus(); 3980 } 3981 3982 cancelTouchTarget(view); 3983 cancelHoverTarget(view); 3984 3985 if (view.getAnimation() != null || 3986 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3987 addDisappearingView(view); 3988 } else if (detach) { 3989 view.dispatchDetachedFromWindow(); 3990 } 3991 3992 if (view.hasTransientState()) { 3993 childHasTransientStateChanged(view, false); 3994 } 3995 3996 onViewRemoved(view); 3997 3998 view.mParent = null; 3999 children[i] = null; 4000 } 4001 4002 if (clearChildFocus) { 4003 clearChildFocus(focused); 4004 if (!rootViewRequestFocus()) { 4005 notifyGlobalFocusCleared(focused); 4006 } 4007 } 4008 } 4009 4010 /** 4011 * Finishes the removal of a detached view. This method will dispatch the detached from 4012 * window event and notify the hierarchy change listener. 4013 * <p> 4014 * This method is intended to be lightweight and makes no assumptions about whether the 4015 * parent or child should be redrawn. Proper use of this method will include also making 4016 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4017 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4018 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4019 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4020 * 4021 * @param child the child to be definitely removed from the view hierarchy 4022 * @param animate if true and the view has an animation, the view is placed in the 4023 * disappearing views list, otherwise, it is detached from the window 4024 * 4025 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4026 * @see #detachAllViewsFromParent() 4027 * @see #detachViewFromParent(View) 4028 * @see #detachViewFromParent(int) 4029 */ 4030 protected void removeDetachedView(View child, boolean animate) { 4031 if (mTransition != null) { 4032 mTransition.removeChild(this, child); 4033 } 4034 4035 if (child == mFocused) { 4036 child.clearFocus(); 4037 } 4038 4039 child.clearAccessibilityFocus(); 4040 4041 cancelTouchTarget(child); 4042 cancelHoverTarget(child); 4043 4044 if ((animate && child.getAnimation() != null) || 4045 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4046 addDisappearingView(child); 4047 } else if (child.mAttachInfo != null) { 4048 child.dispatchDetachedFromWindow(); 4049 } 4050 4051 if (child.hasTransientState()) { 4052 childHasTransientStateChanged(child, false); 4053 } 4054 4055 onViewRemoved(child); 4056 } 4057 4058 /** 4059 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4060 * sets the layout parameters and puts the view in the list of children so that 4061 * it can be retrieved by calling {@link #getChildAt(int)}. 4062 * <p> 4063 * This method is intended to be lightweight and makes no assumptions about whether the 4064 * parent or child should be redrawn. Proper use of this method will include also making 4065 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4066 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4067 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4068 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4069 * <p> 4070 * This method should be called only for views which were detached from their parent. 4071 * 4072 * @param child the child to attach 4073 * @param index the index at which the child should be attached 4074 * @param params the layout parameters of the child 4075 * 4076 * @see #removeDetachedView(View, boolean) 4077 * @see #detachAllViewsFromParent() 4078 * @see #detachViewFromParent(View) 4079 * @see #detachViewFromParent(int) 4080 */ 4081 protected void attachViewToParent(View child, int index, LayoutParams params) { 4082 child.mLayoutParams = params; 4083 4084 if (index < 0) { 4085 index = mChildrenCount; 4086 } 4087 4088 addInArray(child, index); 4089 4090 child.mParent = this; 4091 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4092 & ~PFLAG_DRAWING_CACHE_VALID) 4093 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4094 this.mPrivateFlags |= PFLAG_INVALIDATED; 4095 4096 if (child.hasFocus()) { 4097 requestChildFocus(child, child.findFocus()); 4098 } 4099 } 4100 4101 /** 4102 * Detaches a view from its parent. Detaching a view should be followed 4103 * either by a call to 4104 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4105 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4106 * temporary; reattachment or removal should happen within the same drawing cycle as 4107 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4108 * call to {@link #getChildAt(int)}. 4109 * 4110 * @param child the child to detach 4111 * 4112 * @see #detachViewFromParent(int) 4113 * @see #detachViewsFromParent(int, int) 4114 * @see #detachAllViewsFromParent() 4115 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4116 * @see #removeDetachedView(View, boolean) 4117 */ 4118 protected void detachViewFromParent(View child) { 4119 removeFromArray(indexOfChild(child)); 4120 } 4121 4122 /** 4123 * Detaches a view from its parent. Detaching a view should be followed 4124 * either by a call to 4125 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4126 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4127 * temporary; reattachment or removal should happen within the same drawing cycle as 4128 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4129 * call to {@link #getChildAt(int)}. 4130 * 4131 * @param index the index of the child to detach 4132 * 4133 * @see #detachViewFromParent(View) 4134 * @see #detachAllViewsFromParent() 4135 * @see #detachViewsFromParent(int, int) 4136 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4137 * @see #removeDetachedView(View, boolean) 4138 */ 4139 protected void detachViewFromParent(int index) { 4140 removeFromArray(index); 4141 } 4142 4143 /** 4144 * Detaches a range of views from their parents. Detaching a view should be followed 4145 * either by a call to 4146 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4147 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4148 * temporary; reattachment or removal should happen within the same drawing cycle as 4149 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4150 * call to {@link #getChildAt(int)}. 4151 * 4152 * @param start the first index of the childrend range to detach 4153 * @param count the number of children to detach 4154 * 4155 * @see #detachViewFromParent(View) 4156 * @see #detachViewFromParent(int) 4157 * @see #detachAllViewsFromParent() 4158 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4159 * @see #removeDetachedView(View, boolean) 4160 */ 4161 protected void detachViewsFromParent(int start, int count) { 4162 removeFromArray(start, count); 4163 } 4164 4165 /** 4166 * Detaches all views from the parent. Detaching a view should be followed 4167 * either by a call to 4168 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4169 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4170 * temporary; reattachment or removal should happen within the same drawing cycle as 4171 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4172 * call to {@link #getChildAt(int)}. 4173 * 4174 * @see #detachViewFromParent(View) 4175 * @see #detachViewFromParent(int) 4176 * @see #detachViewsFromParent(int, int) 4177 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4178 * @see #removeDetachedView(View, boolean) 4179 */ 4180 protected void detachAllViewsFromParent() { 4181 final int count = mChildrenCount; 4182 if (count <= 0) { 4183 return; 4184 } 4185 4186 final View[] children = mChildren; 4187 mChildrenCount = 0; 4188 4189 for (int i = count - 1; i >= 0; i--) { 4190 children[i].mParent = null; 4191 children[i] = null; 4192 } 4193 } 4194 4195 /** 4196 * Don't call or override this method. It is used for the implementation of 4197 * the view hierarchy. 4198 */ 4199 public final void invalidateChild(View child, final Rect dirty) { 4200 ViewParent parent = this; 4201 4202 final AttachInfo attachInfo = mAttachInfo; 4203 if (attachInfo != null) { 4204 // If the child is drawing an animation, we want to copy this flag onto 4205 // ourselves and the parent to make sure the invalidate request goes 4206 // through 4207 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4208 == PFLAG_DRAW_ANIMATION; 4209 4210 // Check whether the child that requests the invalidate is fully opaque 4211 // Views being animated or transformed are not considered opaque because we may 4212 // be invalidating their old position and need the parent to paint behind them. 4213 Matrix childMatrix = child.getMatrix(); 4214 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4215 child.getAnimation() == null && childMatrix.isIdentity(); 4216 // Mark the child as dirty, using the appropriate flag 4217 // Make sure we do not set both flags at the same time 4218 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4219 4220 if (child.mLayerType != LAYER_TYPE_NONE) { 4221 mPrivateFlags |= PFLAG_INVALIDATED; 4222 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4223 child.mLocalDirtyRect.union(dirty); 4224 } 4225 4226 final int[] location = attachInfo.mInvalidateChildLocation; 4227 location[CHILD_LEFT_INDEX] = child.mLeft; 4228 location[CHILD_TOP_INDEX] = child.mTop; 4229 if (!childMatrix.isIdentity() || 4230 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4231 RectF boundingRect = attachInfo.mTmpTransformRect; 4232 boundingRect.set(dirty); 4233 Matrix transformMatrix; 4234 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4235 Transformation t = attachInfo.mTmpTransformation; 4236 boolean transformed = getChildStaticTransformation(child, t); 4237 if (transformed) { 4238 transformMatrix = attachInfo.mTmpMatrix; 4239 transformMatrix.set(t.getMatrix()); 4240 if (!childMatrix.isIdentity()) { 4241 transformMatrix.preConcat(childMatrix); 4242 } 4243 } else { 4244 transformMatrix = childMatrix; 4245 } 4246 } else { 4247 transformMatrix = childMatrix; 4248 } 4249 transformMatrix.mapRect(boundingRect); 4250 dirty.set((int) (boundingRect.left - 0.5f), 4251 (int) (boundingRect.top - 0.5f), 4252 (int) (boundingRect.right + 0.5f), 4253 (int) (boundingRect.bottom + 0.5f)); 4254 } 4255 4256 do { 4257 View view = null; 4258 if (parent instanceof View) { 4259 view = (View) parent; 4260 } 4261 4262 if (drawAnimation) { 4263 if (view != null) { 4264 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4265 } else if (parent instanceof ViewRootImpl) { 4266 ((ViewRootImpl) parent).mIsAnimating = true; 4267 } 4268 } 4269 4270 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4271 // flag coming from the child that initiated the invalidate 4272 if (view != null) { 4273 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4274 view.getSolidColor() == 0) { 4275 opaqueFlag = PFLAG_DIRTY; 4276 } 4277 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4278 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4279 } 4280 } 4281 4282 parent = parent.invalidateChildInParent(location, dirty); 4283 if (view != null) { 4284 // Account for transform on current parent 4285 Matrix m = view.getMatrix(); 4286 if (!m.isIdentity()) { 4287 RectF boundingRect = attachInfo.mTmpTransformRect; 4288 boundingRect.set(dirty); 4289 m.mapRect(boundingRect); 4290 dirty.set((int) (boundingRect.left - 0.5f), 4291 (int) (boundingRect.top - 0.5f), 4292 (int) (boundingRect.right + 0.5f), 4293 (int) (boundingRect.bottom + 0.5f)); 4294 } 4295 } 4296 } while (parent != null); 4297 } 4298 } 4299 4300 /** 4301 * Don't call or override this method. It is used for the implementation of 4302 * the view hierarchy. 4303 * 4304 * This implementation returns null if this ViewGroup does not have a parent, 4305 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4306 * does not intersect with this ViewGroup's bounds. 4307 */ 4308 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4309 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4310 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4311 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4312 FLAG_OPTIMIZE_INVALIDATE) { 4313 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4314 location[CHILD_TOP_INDEX] - mScrollY); 4315 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4316 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4317 } 4318 4319 final int left = mLeft; 4320 final int top = mTop; 4321 4322 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4323 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4324 dirty.setEmpty(); 4325 } 4326 } 4327 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4328 4329 location[CHILD_LEFT_INDEX] = left; 4330 location[CHILD_TOP_INDEX] = top; 4331 4332 if (mLayerType != LAYER_TYPE_NONE) { 4333 mPrivateFlags |= PFLAG_INVALIDATED; 4334 mLocalDirtyRect.union(dirty); 4335 } 4336 4337 return mParent; 4338 4339 } else { 4340 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4341 4342 location[CHILD_LEFT_INDEX] = mLeft; 4343 location[CHILD_TOP_INDEX] = mTop; 4344 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4345 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4346 } else { 4347 // in case the dirty rect extends outside the bounds of this container 4348 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4349 } 4350 4351 if (mLayerType != LAYER_TYPE_NONE) { 4352 mPrivateFlags |= PFLAG_INVALIDATED; 4353 mLocalDirtyRect.union(dirty); 4354 } 4355 4356 return mParent; 4357 } 4358 } 4359 4360 return null; 4361 } 4362 4363 /** 4364 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4365 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4366 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4367 * 4368 * @hide 4369 */ 4370 public void invalidateChildFast(View child, final Rect dirty) { 4371 ViewParent parent = this; 4372 4373 final AttachInfo attachInfo = mAttachInfo; 4374 if (attachInfo != null) { 4375 if (child.mLayerType != LAYER_TYPE_NONE) { 4376 child.mLocalDirtyRect.union(dirty); 4377 } 4378 4379 int left = child.mLeft; 4380 int top = child.mTop; 4381 if (!child.getMatrix().isIdentity()) { 4382 child.transformRect(dirty); 4383 } 4384 4385 do { 4386 if (parent instanceof ViewGroup) { 4387 ViewGroup parentVG = (ViewGroup) parent; 4388 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4389 // Layered parents should be recreated, not just re-issued 4390 parentVG.invalidate(); 4391 parent = null; 4392 } else { 4393 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4394 left = parentVG.mLeft; 4395 top = parentVG.mTop; 4396 } 4397 } else { 4398 // Reached the top; this calls into the usual invalidate method in 4399 // ViewRootImpl, which schedules a traversal 4400 final int[] location = attachInfo.mInvalidateChildLocation; 4401 location[0] = left; 4402 location[1] = top; 4403 parent = parent.invalidateChildInParent(location, dirty); 4404 } 4405 } while (parent != null); 4406 } 4407 } 4408 4409 /** 4410 * Quick invalidation method that simply transforms the dirty rect into the parent's 4411 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4412 */ 4413 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4414 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4415 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4416 dirty.offset(left - mScrollX, top - mScrollY); 4417 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4418 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4419 } 4420 4421 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4422 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4423 4424 if (mLayerType != LAYER_TYPE_NONE) { 4425 mLocalDirtyRect.union(dirty); 4426 } 4427 if (!getMatrix().isIdentity()) { 4428 transformRect(dirty); 4429 } 4430 4431 return mParent; 4432 } 4433 } 4434 4435 return null; 4436 } 4437 4438 /** 4439 * Offset a rectangle that is in a descendant's coordinate 4440 * space into our coordinate space. 4441 * @param descendant A descendant of this view 4442 * @param rect A rectangle defined in descendant's coordinate space. 4443 */ 4444 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4445 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4446 } 4447 4448 /** 4449 * Offset a rectangle that is in our coordinate space into an ancestor's 4450 * coordinate space. 4451 * @param descendant A descendant of this view 4452 * @param rect A rectangle defined in descendant's coordinate space. 4453 */ 4454 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4455 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4456 } 4457 4458 /** 4459 * Helper method that offsets a rect either from parent to descendant or 4460 * descendant to parent. 4461 */ 4462 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4463 boolean offsetFromChildToParent, boolean clipToBounds) { 4464 4465 // already in the same coord system :) 4466 if (descendant == this) { 4467 return; 4468 } 4469 4470 ViewParent theParent = descendant.mParent; 4471 4472 // search and offset up to the parent 4473 while ((theParent != null) 4474 && (theParent instanceof View) 4475 && (theParent != this)) { 4476 4477 if (offsetFromChildToParent) { 4478 rect.offset(descendant.mLeft - descendant.mScrollX, 4479 descendant.mTop - descendant.mScrollY); 4480 if (clipToBounds) { 4481 View p = (View) theParent; 4482 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4483 } 4484 } else { 4485 if (clipToBounds) { 4486 View p = (View) theParent; 4487 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4488 } 4489 rect.offset(descendant.mScrollX - descendant.mLeft, 4490 descendant.mScrollY - descendant.mTop); 4491 } 4492 4493 descendant = (View) theParent; 4494 theParent = descendant.mParent; 4495 } 4496 4497 // now that we are up to this view, need to offset one more time 4498 // to get into our coordinate space 4499 if (theParent == this) { 4500 if (offsetFromChildToParent) { 4501 rect.offset(descendant.mLeft - descendant.mScrollX, 4502 descendant.mTop - descendant.mScrollY); 4503 } else { 4504 rect.offset(descendant.mScrollX - descendant.mLeft, 4505 descendant.mScrollY - descendant.mTop); 4506 } 4507 } else { 4508 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4509 } 4510 } 4511 4512 /** 4513 * Offset the vertical location of all children of this view by the specified number of pixels. 4514 * 4515 * @param offset the number of pixels to offset 4516 * 4517 * @hide 4518 */ 4519 public void offsetChildrenTopAndBottom(int offset) { 4520 final int count = mChildrenCount; 4521 final View[] children = mChildren; 4522 boolean invalidate = false; 4523 4524 for (int i = 0; i < count; i++) { 4525 final View v = children[i]; 4526 v.mTop += offset; 4527 v.mBottom += offset; 4528 if (v.mDisplayList != null) { 4529 invalidate = true; 4530 v.mDisplayList.offsetTopAndBottom(offset); 4531 } 4532 } 4533 4534 if (invalidate) { 4535 invalidateViewProperty(false, false); 4536 } 4537 } 4538 4539 /** 4540 * {@inheritDoc} 4541 */ 4542 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4543 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4544 // but for some simple tests it can be useful. If we don't have attach info this 4545 // will allocate memory. 4546 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4547 rect.set(r); 4548 4549 if (!child.hasIdentityMatrix()) { 4550 child.getMatrix().mapRect(rect); 4551 } 4552 4553 int dx = child.mLeft - mScrollX; 4554 int dy = child.mTop - mScrollY; 4555 4556 rect.offset(dx, dy); 4557 4558 if (offset != null) { 4559 if (!child.hasIdentityMatrix()) { 4560 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4561 : new float[2]; 4562 position[0] = offset.x; 4563 position[1] = offset.y; 4564 child.getMatrix().mapPoints(position); 4565 offset.x = (int) (position[0] + 0.5f); 4566 offset.y = (int) (position[1] + 0.5f); 4567 } 4568 offset.x += dx; 4569 offset.y += dy; 4570 } 4571 4572 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4573 if (mParent == null) return true; 4574 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4575 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4576 return mParent.getChildVisibleRect(this, r, offset); 4577 } 4578 4579 return false; 4580 } 4581 4582 /** 4583 * {@inheritDoc} 4584 */ 4585 @Override 4586 public final void layout(int l, int t, int r, int b) { 4587 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 4588 if (mTransition != null) { 4589 mTransition.layoutChange(this); 4590 } 4591 super.layout(l, t, r, b); 4592 } else { 4593 // record the fact that we noop'd it; request layout when transition finishes 4594 mLayoutCalledWhileSuppressed = true; 4595 } 4596 } 4597 4598 /** 4599 * {@inheritDoc} 4600 */ 4601 @Override 4602 protected abstract void onLayout(boolean changed, 4603 int l, int t, int r, int b); 4604 4605 /** 4606 * Indicates whether the view group has the ability to animate its children 4607 * after the first layout. 4608 * 4609 * @return true if the children can be animated, false otherwise 4610 */ 4611 protected boolean canAnimate() { 4612 return mLayoutAnimationController != null; 4613 } 4614 4615 /** 4616 * Runs the layout animation. Calling this method triggers a relayout of 4617 * this view group. 4618 */ 4619 public void startLayoutAnimation() { 4620 if (mLayoutAnimationController != null) { 4621 mGroupFlags |= FLAG_RUN_ANIMATION; 4622 requestLayout(); 4623 } 4624 } 4625 4626 /** 4627 * Schedules the layout animation to be played after the next layout pass 4628 * of this view group. This can be used to restart the layout animation 4629 * when the content of the view group changes or when the activity is 4630 * paused and resumed. 4631 */ 4632 public void scheduleLayoutAnimation() { 4633 mGroupFlags |= FLAG_RUN_ANIMATION; 4634 } 4635 4636 /** 4637 * Sets the layout animation controller used to animate the group's 4638 * children after the first layout. 4639 * 4640 * @param controller the animation controller 4641 */ 4642 public void setLayoutAnimation(LayoutAnimationController controller) { 4643 mLayoutAnimationController = controller; 4644 if (mLayoutAnimationController != null) { 4645 mGroupFlags |= FLAG_RUN_ANIMATION; 4646 } 4647 } 4648 4649 /** 4650 * Returns the layout animation controller used to animate the group's 4651 * children. 4652 * 4653 * @return the current animation controller 4654 */ 4655 public LayoutAnimationController getLayoutAnimation() { 4656 return mLayoutAnimationController; 4657 } 4658 4659 /** 4660 * Indicates whether the children's drawing cache is used during a layout 4661 * animation. By default, the drawing cache is enabled but this will prevent 4662 * nested layout animations from working. To nest animations, you must disable 4663 * the cache. 4664 * 4665 * @return true if the animation cache is enabled, false otherwise 4666 * 4667 * @see #setAnimationCacheEnabled(boolean) 4668 * @see View#setDrawingCacheEnabled(boolean) 4669 */ 4670 @ViewDebug.ExportedProperty 4671 public boolean isAnimationCacheEnabled() { 4672 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4673 } 4674 4675 /** 4676 * Enables or disables the children's drawing cache during a layout animation. 4677 * By default, the drawing cache is enabled but this will prevent nested 4678 * layout animations from working. To nest animations, you must disable the 4679 * cache. 4680 * 4681 * @param enabled true to enable the animation cache, false otherwise 4682 * 4683 * @see #isAnimationCacheEnabled() 4684 * @see View#setDrawingCacheEnabled(boolean) 4685 */ 4686 public void setAnimationCacheEnabled(boolean enabled) { 4687 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4688 } 4689 4690 /** 4691 * Indicates whether this ViewGroup will always try to draw its children using their 4692 * drawing cache. By default this property is enabled. 4693 * 4694 * @return true if the animation cache is enabled, false otherwise 4695 * 4696 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4697 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4698 * @see View#setDrawingCacheEnabled(boolean) 4699 */ 4700 @ViewDebug.ExportedProperty(category = "drawing") 4701 public boolean isAlwaysDrawnWithCacheEnabled() { 4702 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4703 } 4704 4705 /** 4706 * Indicates whether this ViewGroup will always try to draw its children using their 4707 * drawing cache. This property can be set to true when the cache rendering is 4708 * slightly different from the children's normal rendering. Renderings can be different, 4709 * for instance, when the cache's quality is set to low. 4710 * 4711 * When this property is disabled, the ViewGroup will use the drawing cache of its 4712 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4713 * when to start using the drawing cache and when to stop using it. 4714 * 4715 * @param always true to always draw with the drawing cache, false otherwise 4716 * 4717 * @see #isAlwaysDrawnWithCacheEnabled() 4718 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4719 * @see View#setDrawingCacheEnabled(boolean) 4720 * @see View#setDrawingCacheQuality(int) 4721 */ 4722 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4723 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4724 } 4725 4726 /** 4727 * Indicates whether the ViewGroup is currently drawing its children using 4728 * their drawing cache. 4729 * 4730 * @return true if children should be drawn with their cache, false otherwise 4731 * 4732 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4733 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4734 */ 4735 @ViewDebug.ExportedProperty(category = "drawing") 4736 protected boolean isChildrenDrawnWithCacheEnabled() { 4737 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4738 } 4739 4740 /** 4741 * Tells the ViewGroup to draw its children using their drawing cache. This property 4742 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4743 * will be used only if it has been enabled. 4744 * 4745 * Subclasses should call this method to start and stop using the drawing cache when 4746 * they perform performance sensitive operations, like scrolling or animating. 4747 * 4748 * @param enabled true if children should be drawn with their cache, false otherwise 4749 * 4750 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4751 * @see #isChildrenDrawnWithCacheEnabled() 4752 */ 4753 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4754 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4755 } 4756 4757 /** 4758 * Indicates whether the ViewGroup is drawing its children in the order defined by 4759 * {@link #getChildDrawingOrder(int, int)}. 4760 * 4761 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4762 * false otherwise 4763 * 4764 * @see #setChildrenDrawingOrderEnabled(boolean) 4765 * @see #getChildDrawingOrder(int, int) 4766 */ 4767 @ViewDebug.ExportedProperty(category = "drawing") 4768 protected boolean isChildrenDrawingOrderEnabled() { 4769 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4770 } 4771 4772 /** 4773 * Tells the ViewGroup whether to draw its children in the order defined by the method 4774 * {@link #getChildDrawingOrder(int, int)}. 4775 * 4776 * @param enabled true if the order of the children when drawing is determined by 4777 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4778 * 4779 * @see #isChildrenDrawingOrderEnabled() 4780 * @see #getChildDrawingOrder(int, int) 4781 */ 4782 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4783 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4784 } 4785 4786 private boolean hasBooleanFlag(int flag) { 4787 return (mGroupFlags & flag) == flag; 4788 } 4789 4790 private void setBooleanFlag(int flag, boolean value) { 4791 if (value) { 4792 mGroupFlags |= flag; 4793 } else { 4794 mGroupFlags &= ~flag; 4795 } 4796 } 4797 4798 /** 4799 * Returns an integer indicating what types of drawing caches are kept in memory. 4800 * 4801 * @see #setPersistentDrawingCache(int) 4802 * @see #setAnimationCacheEnabled(boolean) 4803 * 4804 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4805 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4806 * and {@link #PERSISTENT_ALL_CACHES} 4807 */ 4808 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4809 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4810 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4811 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4812 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4813 }) 4814 public int getPersistentDrawingCache() { 4815 return mPersistentDrawingCache; 4816 } 4817 4818 /** 4819 * Indicates what types of drawing caches should be kept in memory after 4820 * they have been created. 4821 * 4822 * @see #getPersistentDrawingCache() 4823 * @see #setAnimationCacheEnabled(boolean) 4824 * 4825 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4826 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4827 * and {@link #PERSISTENT_ALL_CACHES} 4828 */ 4829 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4830 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4831 } 4832 4833 private void setLayoutMode(int layoutMode, boolean explicitly) { 4834 mLayoutMode = layoutMode; 4835 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4836 } 4837 4838 /** 4839 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4840 * descendants that had inherited a different layoutMode from a previous parent. 4841 * Recursion terminates when a descendant's mode is: 4842 * <ul> 4843 * <li>Undefined</li> 4844 * <li>The same as the root node's</li> 4845 * <li>A mode that had been explicitly set</li> 4846 * <ul/> 4847 * The first two clauses are optimizations. 4848 * @param layoutModeOfRoot 4849 */ 4850 @Override 4851 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4852 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4853 mLayoutMode == layoutModeOfRoot || 4854 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4855 return; 4856 } 4857 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4858 4859 // apply recursively 4860 for (int i = 0, N = getChildCount(); i < N; i++) { 4861 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4862 } 4863 } 4864 4865 /** 4866 * Returns the basis of alignment during layout operations on this ViewGroup: 4867 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4868 * <p> 4869 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4870 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4871 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4872 * 4873 * @return the layout mode to use during layout operations 4874 * 4875 * @see #setLayoutMode(int) 4876 */ 4877 public int getLayoutMode() { 4878 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4879 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4880 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4881 setLayoutMode(inheritedLayoutMode, false); 4882 } 4883 return mLayoutMode; 4884 } 4885 4886 /** 4887 * Sets the basis of alignment during the layout of this ViewGroup. 4888 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4889 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4890 * 4891 * @param layoutMode the layout mode to use during layout operations 4892 * 4893 * @see #getLayoutMode() 4894 */ 4895 public void setLayoutMode(int layoutMode) { 4896 if (mLayoutMode != layoutMode) { 4897 invalidateInheritedLayoutMode(layoutMode); 4898 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4899 requestLayout(); 4900 } 4901 } 4902 4903 /** 4904 * Returns a new set of layout parameters based on the supplied attributes set. 4905 * 4906 * @param attrs the attributes to build the layout parameters from 4907 * 4908 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4909 * of its descendants 4910 */ 4911 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4912 return new LayoutParams(getContext(), attrs); 4913 } 4914 4915 /** 4916 * Returns a safe set of layout parameters based on the supplied layout params. 4917 * When a ViewGroup is passed a View whose layout params do not pass the test of 4918 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4919 * is invoked. This method should return a new set of layout params suitable for 4920 * this ViewGroup, possibly by copying the appropriate attributes from the 4921 * specified set of layout params. 4922 * 4923 * @param p The layout parameters to convert into a suitable set of layout parameters 4924 * for this ViewGroup. 4925 * 4926 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4927 * of its descendants 4928 */ 4929 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4930 return p; 4931 } 4932 4933 /** 4934 * Returns a set of default layout parameters. These parameters are requested 4935 * when the View passed to {@link #addView(View)} has no layout parameters 4936 * already set. If null is returned, an exception is thrown from addView. 4937 * 4938 * @return a set of default layout parameters or null 4939 */ 4940 protected LayoutParams generateDefaultLayoutParams() { 4941 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4942 } 4943 4944 /** 4945 * {@inheritDoc} 4946 */ 4947 @Override 4948 protected void debug(int depth) { 4949 super.debug(depth); 4950 String output; 4951 4952 if (mFocused != null) { 4953 output = debugIndent(depth); 4954 output += "mFocused"; 4955 Log.d(VIEW_LOG_TAG, output); 4956 } 4957 if (mChildrenCount != 0) { 4958 output = debugIndent(depth); 4959 output += "{"; 4960 Log.d(VIEW_LOG_TAG, output); 4961 } 4962 int count = mChildrenCount; 4963 for (int i = 0; i < count; i++) { 4964 View child = mChildren[i]; 4965 child.debug(depth + 1); 4966 } 4967 4968 if (mChildrenCount != 0) { 4969 output = debugIndent(depth); 4970 output += "}"; 4971 Log.d(VIEW_LOG_TAG, output); 4972 } 4973 } 4974 4975 /** 4976 * Returns the position in the group of the specified child view. 4977 * 4978 * @param child the view for which to get the position 4979 * @return a positive integer representing the position of the view in the 4980 * group, or -1 if the view does not exist in the group 4981 */ 4982 public int indexOfChild(View child) { 4983 final int count = mChildrenCount; 4984 final View[] children = mChildren; 4985 for (int i = 0; i < count; i++) { 4986 if (children[i] == child) { 4987 return i; 4988 } 4989 } 4990 return -1; 4991 } 4992 4993 /** 4994 * Returns the number of children in the group. 4995 * 4996 * @return a positive integer representing the number of children in 4997 * the group 4998 */ 4999 public int getChildCount() { 5000 return mChildrenCount; 5001 } 5002 5003 /** 5004 * Returns the view at the specified position in the group. 5005 * 5006 * @param index the position at which to get the view from 5007 * @return the view at the specified position or null if the position 5008 * does not exist within the group 5009 */ 5010 public View getChildAt(int index) { 5011 if (index < 0 || index >= mChildrenCount) { 5012 return null; 5013 } 5014 return mChildren[index]; 5015 } 5016 5017 /** 5018 * Ask all of the children of this view to measure themselves, taking into 5019 * account both the MeasureSpec requirements for this view and its padding. 5020 * We skip children that are in the GONE state The heavy lifting is done in 5021 * getChildMeasureSpec. 5022 * 5023 * @param widthMeasureSpec The width requirements for this view 5024 * @param heightMeasureSpec The height requirements for this view 5025 */ 5026 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5027 final int size = mChildrenCount; 5028 final View[] children = mChildren; 5029 for (int i = 0; i < size; ++i) { 5030 final View child = children[i]; 5031 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5032 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5033 } 5034 } 5035 } 5036 5037 /** 5038 * Ask one of the children of this view to measure itself, taking into 5039 * account both the MeasureSpec requirements for this view and its padding. 5040 * The heavy lifting is done in getChildMeasureSpec. 5041 * 5042 * @param child The child to measure 5043 * @param parentWidthMeasureSpec The width requirements for this view 5044 * @param parentHeightMeasureSpec The height requirements for this view 5045 */ 5046 protected void measureChild(View child, int parentWidthMeasureSpec, 5047 int parentHeightMeasureSpec) { 5048 final LayoutParams lp = child.getLayoutParams(); 5049 5050 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5051 mPaddingLeft + mPaddingRight, lp.width); 5052 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5053 mPaddingTop + mPaddingBottom, lp.height); 5054 5055 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5056 } 5057 5058 /** 5059 * Ask one of the children of this view to measure itself, taking into 5060 * account both the MeasureSpec requirements for this view and its padding 5061 * and margins. The child must have MarginLayoutParams The heavy lifting is 5062 * done in getChildMeasureSpec. 5063 * 5064 * @param child The child to measure 5065 * @param parentWidthMeasureSpec The width requirements for this view 5066 * @param widthUsed Extra space that has been used up by the parent 5067 * horizontally (possibly by other children of the parent) 5068 * @param parentHeightMeasureSpec The height requirements for this view 5069 * @param heightUsed Extra space that has been used up by the parent 5070 * vertically (possibly by other children of the parent) 5071 */ 5072 protected void measureChildWithMargins(View child, 5073 int parentWidthMeasureSpec, int widthUsed, 5074 int parentHeightMeasureSpec, int heightUsed) { 5075 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5076 5077 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5078 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5079 + widthUsed, lp.width); 5080 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5081 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5082 + heightUsed, lp.height); 5083 5084 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5085 } 5086 5087 /** 5088 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5089 * pass to a particular child. This method figures out the right MeasureSpec 5090 * for one dimension (height or width) of one child view. 5091 * 5092 * The goal is to combine information from our MeasureSpec with the 5093 * LayoutParams of the child to get the best possible results. For example, 5094 * if the this view knows its size (because its MeasureSpec has a mode of 5095 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5096 * to be the same size as the parent, the parent should ask the child to 5097 * layout given an exact size. 5098 * 5099 * @param spec The requirements for this view 5100 * @param padding The padding of this view for the current dimension and 5101 * margins, if applicable 5102 * @param childDimension How big the child wants to be in the current 5103 * dimension 5104 * @return a MeasureSpec integer for the child 5105 */ 5106 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5107 int specMode = MeasureSpec.getMode(spec); 5108 int specSize = MeasureSpec.getSize(spec); 5109 5110 int size = Math.max(0, specSize - padding); 5111 5112 int resultSize = 0; 5113 int resultMode = 0; 5114 5115 switch (specMode) { 5116 // Parent has imposed an exact size on us 5117 case MeasureSpec.EXACTLY: 5118 if (childDimension >= 0) { 5119 resultSize = childDimension; 5120 resultMode = MeasureSpec.EXACTLY; 5121 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5122 // Child wants to be our size. So be it. 5123 resultSize = size; 5124 resultMode = MeasureSpec.EXACTLY; 5125 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5126 // Child wants to determine its own size. It can't be 5127 // bigger than us. 5128 resultSize = size; 5129 resultMode = MeasureSpec.AT_MOST; 5130 } 5131 break; 5132 5133 // Parent has imposed a maximum size on us 5134 case MeasureSpec.AT_MOST: 5135 if (childDimension >= 0) { 5136 // Child wants a specific size... so be it 5137 resultSize = childDimension; 5138 resultMode = MeasureSpec.EXACTLY; 5139 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5140 // Child wants to be our size, but our size is not fixed. 5141 // Constrain child to not be bigger than us. 5142 resultSize = size; 5143 resultMode = MeasureSpec.AT_MOST; 5144 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5145 // Child wants to determine its own size. It can't be 5146 // bigger than us. 5147 resultSize = size; 5148 resultMode = MeasureSpec.AT_MOST; 5149 } 5150 break; 5151 5152 // Parent asked to see how big we want to be 5153 case MeasureSpec.UNSPECIFIED: 5154 if (childDimension >= 0) { 5155 // Child wants a specific size... let him have it 5156 resultSize = childDimension; 5157 resultMode = MeasureSpec.EXACTLY; 5158 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5159 // Child wants to be our size... find out how big it should 5160 // be 5161 resultSize = 0; 5162 resultMode = MeasureSpec.UNSPECIFIED; 5163 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5164 // Child wants to determine its own size.... find out how 5165 // big it should be 5166 resultSize = 0; 5167 resultMode = MeasureSpec.UNSPECIFIED; 5168 } 5169 break; 5170 } 5171 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5172 } 5173 5174 5175 /** 5176 * Removes any pending animations for views that have been removed. Call 5177 * this if you don't want animations for exiting views to stack up. 5178 */ 5179 public void clearDisappearingChildren() { 5180 if (mDisappearingChildren != null) { 5181 mDisappearingChildren.clear(); 5182 invalidate(); 5183 } 5184 } 5185 5186 /** 5187 * Add a view which is removed from mChildren but still needs animation 5188 * 5189 * @param v View to add 5190 */ 5191 private void addDisappearingView(View v) { 5192 ArrayList<View> disappearingChildren = mDisappearingChildren; 5193 5194 if (disappearingChildren == null) { 5195 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5196 } 5197 5198 disappearingChildren.add(v); 5199 } 5200 5201 /** 5202 * Cleanup a view when its animation is done. This may mean removing it from 5203 * the list of disappearing views. 5204 * 5205 * @param view The view whose animation has finished 5206 * @param animation The animation, cannot be null 5207 */ 5208 void finishAnimatingView(final View view, Animation animation) { 5209 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5210 if (disappearingChildren != null) { 5211 if (disappearingChildren.contains(view)) { 5212 disappearingChildren.remove(view); 5213 5214 if (view.mAttachInfo != null) { 5215 view.dispatchDetachedFromWindow(); 5216 } 5217 5218 view.clearAnimation(); 5219 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5220 } 5221 } 5222 5223 if (animation != null && !animation.getFillAfter()) { 5224 view.clearAnimation(); 5225 } 5226 5227 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5228 view.onAnimationEnd(); 5229 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5230 // so we'd rather be safe than sorry 5231 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5232 // Draw one more frame after the animation is done 5233 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5234 } 5235 } 5236 5237 /** 5238 * Utility function called by View during invalidation to determine whether a view that 5239 * is invisible or gone should still be invalidated because it is being transitioned (and 5240 * therefore still needs to be drawn). 5241 */ 5242 boolean isViewTransitioning(View view) { 5243 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5244 } 5245 5246 /** 5247 * This method tells the ViewGroup that the given View object, which should have this 5248 * ViewGroup as its parent, 5249 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5250 * is removed from its parent. This allows animations, such as those used by 5251 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5252 * the removal of views. A call to this method should always be accompanied by a later call 5253 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5254 * so that the View finally gets removed. 5255 * 5256 * @param view The View object to be kept visible even if it gets removed from its parent. 5257 */ 5258 public void startViewTransition(View view) { 5259 if (view.mParent == this) { 5260 if (mTransitioningViews == null) { 5261 mTransitioningViews = new ArrayList<View>(); 5262 } 5263 mTransitioningViews.add(view); 5264 } 5265 } 5266 5267 /** 5268 * This method should always be called following an earlier call to 5269 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5270 * and will no longer be displayed. Note that this method does not perform the functionality 5271 * of removing a view from its parent; it just discontinues the display of a View that 5272 * has previously been removed. 5273 * 5274 * @return view The View object that has been removed but is being kept around in the visible 5275 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5276 */ 5277 public void endViewTransition(View view) { 5278 if (mTransitioningViews != null) { 5279 mTransitioningViews.remove(view); 5280 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5281 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5282 disappearingChildren.remove(view); 5283 if (mVisibilityChangingChildren != null && 5284 mVisibilityChangingChildren.contains(view)) { 5285 mVisibilityChangingChildren.remove(view); 5286 } else { 5287 if (view.mAttachInfo != null) { 5288 view.dispatchDetachedFromWindow(); 5289 } 5290 if (view.mParent != null) { 5291 view.mParent = null; 5292 } 5293 } 5294 invalidate(); 5295 } 5296 } 5297 } 5298 5299 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5300 new LayoutTransition.TransitionListener() { 5301 @Override 5302 public void startTransition(LayoutTransition transition, ViewGroup container, 5303 View view, int transitionType) { 5304 // We only care about disappearing items, since we need special logic to keep 5305 // those items visible after they've been 'removed' 5306 if (transitionType == LayoutTransition.DISAPPEARING) { 5307 startViewTransition(view); 5308 } 5309 } 5310 5311 @Override 5312 public void endTransition(LayoutTransition transition, ViewGroup container, 5313 View view, int transitionType) { 5314 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5315 requestLayout(); 5316 mLayoutCalledWhileSuppressed = false; 5317 } 5318 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5319 endViewTransition(view); 5320 } 5321 } 5322 }; 5323 5324 /** 5325 * Tells this ViewGroup to suppress all layout() calls until layout 5326 * suppression is disabled with a later call to suppressLayout(false). 5327 * When layout suppression is disabled, a requestLayout() call is sent 5328 * if layout() was attempted while layout was being suppressed. 5329 * 5330 * @hide 5331 */ 5332 public void suppressLayout(boolean suppress) { 5333 mSuppressLayout = suppress; 5334 if (!suppress) { 5335 if (mLayoutCalledWhileSuppressed) { 5336 requestLayout(); 5337 mLayoutCalledWhileSuppressed = false; 5338 } 5339 } 5340 } 5341 5342 /** 5343 * {@inheritDoc} 5344 */ 5345 @Override 5346 public boolean gatherTransparentRegion(Region region) { 5347 // If no transparent regions requested, we are always opaque. 5348 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5349 if (meOpaque && region == null) { 5350 // The caller doesn't care about the region, so stop now. 5351 return true; 5352 } 5353 super.gatherTransparentRegion(region); 5354 final View[] children = mChildren; 5355 final int count = mChildrenCount; 5356 boolean noneOfTheChildrenAreTransparent = true; 5357 for (int i = 0; i < count; i++) { 5358 final View child = children[i]; 5359 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5360 if (!child.gatherTransparentRegion(region)) { 5361 noneOfTheChildrenAreTransparent = false; 5362 } 5363 } 5364 } 5365 return meOpaque || noneOfTheChildrenAreTransparent; 5366 } 5367 5368 /** 5369 * {@inheritDoc} 5370 */ 5371 public void requestTransparentRegion(View child) { 5372 if (child != null) { 5373 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5374 if (mParent != null) { 5375 mParent.requestTransparentRegion(this); 5376 } 5377 } 5378 } 5379 5380 5381 @Override 5382 protected boolean fitSystemWindows(Rect insets) { 5383 boolean done = super.fitSystemWindows(insets); 5384 if (!done) { 5385 final int count = mChildrenCount; 5386 final View[] children = mChildren; 5387 for (int i = 0; i < count; i++) { 5388 done = children[i].fitSystemWindows(insets); 5389 if (done) { 5390 break; 5391 } 5392 } 5393 } 5394 return done; 5395 } 5396 5397 /** 5398 * Returns the animation listener to which layout animation events are 5399 * sent. 5400 * 5401 * @return an {@link android.view.animation.Animation.AnimationListener} 5402 */ 5403 public Animation.AnimationListener getLayoutAnimationListener() { 5404 return mAnimationListener; 5405 } 5406 5407 @Override 5408 protected void drawableStateChanged() { 5409 super.drawableStateChanged(); 5410 5411 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5412 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5413 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5414 + " child has duplicateParentState set to true"); 5415 } 5416 5417 final View[] children = mChildren; 5418 final int count = mChildrenCount; 5419 5420 for (int i = 0; i < count; i++) { 5421 final View child = children[i]; 5422 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5423 child.refreshDrawableState(); 5424 } 5425 } 5426 } 5427 } 5428 5429 @Override 5430 public void jumpDrawablesToCurrentState() { 5431 super.jumpDrawablesToCurrentState(); 5432 final View[] children = mChildren; 5433 final int count = mChildrenCount; 5434 for (int i = 0; i < count; i++) { 5435 children[i].jumpDrawablesToCurrentState(); 5436 } 5437 } 5438 5439 @Override 5440 protected int[] onCreateDrawableState(int extraSpace) { 5441 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5442 return super.onCreateDrawableState(extraSpace); 5443 } 5444 5445 int need = 0; 5446 int n = getChildCount(); 5447 for (int i = 0; i < n; i++) { 5448 int[] childState = getChildAt(i).getDrawableState(); 5449 5450 if (childState != null) { 5451 need += childState.length; 5452 } 5453 } 5454 5455 int[] state = super.onCreateDrawableState(extraSpace + need); 5456 5457 for (int i = 0; i < n; i++) { 5458 int[] childState = getChildAt(i).getDrawableState(); 5459 5460 if (childState != null) { 5461 state = mergeDrawableStates(state, childState); 5462 } 5463 } 5464 5465 return state; 5466 } 5467 5468 /** 5469 * Sets whether this ViewGroup's drawable states also include 5470 * its children's drawable states. This is used, for example, to 5471 * make a group appear to be focused when its child EditText or button 5472 * is focused. 5473 */ 5474 public void setAddStatesFromChildren(boolean addsStates) { 5475 if (addsStates) { 5476 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5477 } else { 5478 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5479 } 5480 5481 refreshDrawableState(); 5482 } 5483 5484 /** 5485 * Returns whether this ViewGroup's drawable states also include 5486 * its children's drawable states. This is used, for example, to 5487 * make a group appear to be focused when its child EditText or button 5488 * is focused. 5489 */ 5490 public boolean addStatesFromChildren() { 5491 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5492 } 5493 5494 /** 5495 * If {@link #addStatesFromChildren} is true, refreshes this group's 5496 * drawable state (to include the states from its children). 5497 */ 5498 public void childDrawableStateChanged(View child) { 5499 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5500 refreshDrawableState(); 5501 } 5502 } 5503 5504 /** 5505 * Specifies the animation listener to which layout animation events must 5506 * be sent. Only 5507 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5508 * and 5509 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5510 * are invoked. 5511 * 5512 * @param animationListener the layout animation listener 5513 */ 5514 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5515 mAnimationListener = animationListener; 5516 } 5517 5518 /** 5519 * This method is called by LayoutTransition when there are 'changing' animations that need 5520 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5521 * starts all pending transitions prior to the drawing phase in the current traversal. 5522 * 5523 * @param transition The LayoutTransition to be started on the next traversal. 5524 * 5525 * @hide 5526 */ 5527 public void requestTransitionStart(LayoutTransition transition) { 5528 ViewRootImpl viewAncestor = getViewRootImpl(); 5529 if (viewAncestor != null) { 5530 viewAncestor.requestTransitionStart(transition); 5531 } 5532 } 5533 5534 /** 5535 * @hide 5536 */ 5537 @Override 5538 public boolean resolveRtlPropertiesIfNeeded() { 5539 final boolean result = super.resolveRtlPropertiesIfNeeded(); 5540 // We dont need to resolve the children RTL properties if nothing has changed for the parent 5541 if (result) { 5542 int count = getChildCount(); 5543 for (int i = 0; i < count; i++) { 5544 final View child = getChildAt(i); 5545 if (child.isLayoutDirectionInherited()) { 5546 child.resolveRtlPropertiesIfNeeded(); 5547 } 5548 } 5549 } 5550 return result; 5551 } 5552 5553 /** 5554 * @hide 5555 */ 5556 @Override 5557 public boolean resolveLayoutDirection() { 5558 final boolean result = super.resolveLayoutDirection(); 5559 if (result) { 5560 int count = getChildCount(); 5561 for (int i = 0; i < count; i++) { 5562 final View child = getChildAt(i); 5563 if (child.isLayoutDirectionInherited()) { 5564 child.resolveLayoutDirection(); 5565 } 5566 } 5567 } 5568 return result; 5569 } 5570 5571 /** 5572 * @hide 5573 */ 5574 @Override 5575 public boolean resolveTextDirection() { 5576 final boolean result = super.resolveTextDirection(); 5577 if (result) { 5578 int count = getChildCount(); 5579 for (int i = 0; i < count; i++) { 5580 final View child = getChildAt(i); 5581 if (child.isTextDirectionInherited()) { 5582 child.resolveTextDirection(); 5583 } 5584 } 5585 } 5586 return result; 5587 } 5588 5589 /** 5590 * @hide 5591 */ 5592 @Override 5593 public boolean resolveTextAlignment() { 5594 final boolean result = super.resolveTextAlignment(); 5595 if (result) { 5596 int count = getChildCount(); 5597 for (int i = 0; i < count; i++) { 5598 final View child = getChildAt(i); 5599 if (child.isTextAlignmentInherited()) { 5600 child.resolveTextAlignment(); 5601 } 5602 } 5603 } 5604 return result; 5605 } 5606 5607 /** 5608 * @hide 5609 */ 5610 @Override 5611 public void resolvePadding() { 5612 super.resolvePadding(); 5613 int count = getChildCount(); 5614 for (int i = 0; i < count; i++) { 5615 final View child = getChildAt(i); 5616 if (child.isLayoutDirectionInherited()) { 5617 child.resolvePadding(); 5618 } 5619 } 5620 } 5621 5622 /** 5623 * @hide 5624 */ 5625 @Override 5626 protected void resolveDrawables() { 5627 super.resolveDrawables(); 5628 int count = getChildCount(); 5629 for (int i = 0; i < count; i++) { 5630 final View child = getChildAt(i); 5631 if (child.isLayoutDirectionInherited()) { 5632 child.resolveDrawables(); 5633 } 5634 } 5635 } 5636 5637 /** 5638 * @hide 5639 */ 5640 @Override 5641 public void resolveLayoutParams() { 5642 super.resolveLayoutParams(); 5643 int count = getChildCount(); 5644 for (int i = 0; i < count; i++) { 5645 final View child = getChildAt(i); 5646 child.resolveLayoutParams(); 5647 } 5648 } 5649 5650 /** 5651 * @hide 5652 */ 5653 @Override 5654 public void resetResolvedLayoutDirection() { 5655 super.resetResolvedLayoutDirection(); 5656 5657 int count = getChildCount(); 5658 for (int i = 0; i < count; i++) { 5659 final View child = getChildAt(i); 5660 if (child.isLayoutDirectionInherited()) { 5661 child.resetResolvedLayoutDirection(); 5662 } 5663 } 5664 } 5665 5666 /** 5667 * @hide 5668 */ 5669 @Override 5670 public void resetResolvedTextDirection() { 5671 super.resetResolvedTextDirection(); 5672 5673 int count = getChildCount(); 5674 for (int i = 0; i < count; i++) { 5675 final View child = getChildAt(i); 5676 if (child.isTextDirectionInherited()) { 5677 child.resetResolvedTextDirection(); 5678 } 5679 } 5680 } 5681 5682 /** 5683 * @hide 5684 */ 5685 @Override 5686 public void resetResolvedTextAlignment() { 5687 super.resetResolvedTextAlignment(); 5688 5689 int count = getChildCount(); 5690 for (int i = 0; i < count; i++) { 5691 final View child = getChildAt(i); 5692 if (child.isTextAlignmentInherited()) { 5693 child.resetResolvedTextAlignment(); 5694 } 5695 } 5696 } 5697 5698 /** 5699 * @hide 5700 */ 5701 @Override 5702 public void resetResolvedPadding() { 5703 super.resetResolvedPadding(); 5704 5705 int count = getChildCount(); 5706 for (int i = 0; i < count; i++) { 5707 final View child = getChildAt(i); 5708 if (child.isLayoutDirectionInherited()) { 5709 child.resetResolvedPadding(); 5710 } 5711 } 5712 } 5713 5714 /** 5715 * @hide 5716 */ 5717 @Override 5718 protected void resetResolvedDrawables() { 5719 super.resetResolvedDrawables(); 5720 5721 int count = getChildCount(); 5722 for (int i = 0; i < count; i++) { 5723 final View child = getChildAt(i); 5724 if (child.isLayoutDirectionInherited()) { 5725 child.resetResolvedDrawables(); 5726 } 5727 } 5728 } 5729 5730 /** 5731 * Return true if the pressed state should be delayed for children or descendants of this 5732 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5733 * This prevents the pressed state from appearing when the user is actually trying to scroll 5734 * the content. 5735 * 5736 * The default implementation returns true for compatibility reasons. Subclasses that do 5737 * not scroll should generally override this method and return false. 5738 */ 5739 public boolean shouldDelayChildPressedState() { 5740 return true; 5741 } 5742 5743 /** @hide */ 5744 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5745 } 5746 5747 /** 5748 * LayoutParams are used by views to tell their parents how they want to be 5749 * laid out. See 5750 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5751 * for a list of all child view attributes that this class supports. 5752 * 5753 * <p> 5754 * The base LayoutParams class just describes how big the view wants to be 5755 * for both width and height. For each dimension, it can specify one of: 5756 * <ul> 5757 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5758 * means that the view wants to be as big as its parent (minus padding) 5759 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5760 * to enclose its content (plus padding) 5761 * <li> an exact number 5762 * </ul> 5763 * There are subclasses of LayoutParams for different subclasses of 5764 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5765 * LayoutParams which adds an X and Y value.</p> 5766 * 5767 * <div class="special reference"> 5768 * <h3>Developer Guides</h3> 5769 * <p>For more information about creating user interface layouts, read the 5770 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5771 * guide.</p></div> 5772 * 5773 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5774 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5775 */ 5776 public static class LayoutParams { 5777 /** 5778 * Special value for the height or width requested by a View. 5779 * FILL_PARENT means that the view wants to be as big as its parent, 5780 * minus the parent's padding, if any. This value is deprecated 5781 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5782 */ 5783 @SuppressWarnings({"UnusedDeclaration"}) 5784 @Deprecated 5785 public static final int FILL_PARENT = -1; 5786 5787 /** 5788 * Special value for the height or width requested by a View. 5789 * MATCH_PARENT means that the view wants to be as big as its parent, 5790 * minus the parent's padding, if any. Introduced in API Level 8. 5791 */ 5792 public static final int MATCH_PARENT = -1; 5793 5794 /** 5795 * Special value for the height or width requested by a View. 5796 * WRAP_CONTENT means that the view wants to be just large enough to fit 5797 * its own internal content, taking its own padding into account. 5798 */ 5799 public static final int WRAP_CONTENT = -2; 5800 5801 /** 5802 * Information about how wide the view wants to be. Can be one of the 5803 * constants FILL_PARENT (replaced by MATCH_PARENT , 5804 * in API Level 8) or WRAP_CONTENT. or an exact size. 5805 */ 5806 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5807 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5808 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5809 }) 5810 public int width; 5811 5812 /** 5813 * Information about how tall the view wants to be. Can be one of the 5814 * constants FILL_PARENT (replaced by MATCH_PARENT , 5815 * in API Level 8) or WRAP_CONTENT. or an exact size. 5816 */ 5817 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5818 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5819 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5820 }) 5821 public int height; 5822 5823 /** 5824 * Used to animate layouts. 5825 */ 5826 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5827 5828 /** 5829 * Creates a new set of layout parameters. The values are extracted from 5830 * the supplied attributes set and context. The XML attributes mapped 5831 * to this set of layout parameters are: 5832 * 5833 * <ul> 5834 * <li><code>layout_width</code>: the width, either an exact value, 5835 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5836 * {@link #MATCH_PARENT} in API Level 8)</li> 5837 * <li><code>layout_height</code>: the height, either an exact value, 5838 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5839 * {@link #MATCH_PARENT} in API Level 8)</li> 5840 * </ul> 5841 * 5842 * @param c the application environment 5843 * @param attrs the set of attributes from which to extract the layout 5844 * parameters' values 5845 */ 5846 public LayoutParams(Context c, AttributeSet attrs) { 5847 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5848 setBaseAttributes(a, 5849 R.styleable.ViewGroup_Layout_layout_width, 5850 R.styleable.ViewGroup_Layout_layout_height); 5851 a.recycle(); 5852 } 5853 5854 /** 5855 * Creates a new set of layout parameters with the specified width 5856 * and height. 5857 * 5858 * @param width the width, either {@link #WRAP_CONTENT}, 5859 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5860 * API Level 8), or a fixed size in pixels 5861 * @param height the height, either {@link #WRAP_CONTENT}, 5862 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5863 * API Level 8), or a fixed size in pixels 5864 */ 5865 public LayoutParams(int width, int height) { 5866 this.width = width; 5867 this.height = height; 5868 } 5869 5870 /** 5871 * Copy constructor. Clones the width and height values of the source. 5872 * 5873 * @param source The layout params to copy from. 5874 */ 5875 public LayoutParams(LayoutParams source) { 5876 this.width = source.width; 5877 this.height = source.height; 5878 } 5879 5880 /** 5881 * Used internally by MarginLayoutParams. 5882 * @hide 5883 */ 5884 LayoutParams() { 5885 } 5886 5887 /** 5888 * Extracts the layout parameters from the supplied attributes. 5889 * 5890 * @param a the style attributes to extract the parameters from 5891 * @param widthAttr the identifier of the width attribute 5892 * @param heightAttr the identifier of the height attribute 5893 */ 5894 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5895 width = a.getLayoutDimension(widthAttr, "layout_width"); 5896 height = a.getLayoutDimension(heightAttr, "layout_height"); 5897 } 5898 5899 /** 5900 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5901 * layoutDirection changes should override this method. The default implementation does 5902 * nothing. 5903 * 5904 * @param layoutDirection the direction of the layout 5905 * 5906 * {@link View#LAYOUT_DIRECTION_LTR} 5907 * {@link View#LAYOUT_DIRECTION_RTL} 5908 */ 5909 public void resolveLayoutDirection(int layoutDirection) { 5910 } 5911 5912 /** 5913 * Returns a String representation of this set of layout parameters. 5914 * 5915 * @param output the String to prepend to the internal representation 5916 * @return a String with the following format: output + 5917 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5918 * 5919 * @hide 5920 */ 5921 public String debug(String output) { 5922 return output + "ViewGroup.LayoutParams={ width=" 5923 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5924 } 5925 5926 /** 5927 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5928 * 5929 * @param view the view that contains these layout parameters 5930 * @param canvas the canvas on which to draw 5931 * 5932 * @hide 5933 */ 5934 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5935 } 5936 5937 /** 5938 * Converts the specified size to a readable String. 5939 * 5940 * @param size the size to convert 5941 * @return a String instance representing the supplied size 5942 * 5943 * @hide 5944 */ 5945 protected static String sizeToString(int size) { 5946 if (size == WRAP_CONTENT) { 5947 return "wrap-content"; 5948 } 5949 if (size == MATCH_PARENT) { 5950 return "match-parent"; 5951 } 5952 return String.valueOf(size); 5953 } 5954 } 5955 5956 /** 5957 * Per-child layout information for layouts that support margins. 5958 * See 5959 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5960 * for a list of all child view attributes that this class supports. 5961 */ 5962 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5963 /** 5964 * The left margin in pixels of the child. 5965 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5966 * to this field. 5967 */ 5968 @ViewDebug.ExportedProperty(category = "layout") 5969 public int leftMargin; 5970 5971 /** 5972 * The top margin in pixels of the child. 5973 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5974 * to this field. 5975 */ 5976 @ViewDebug.ExportedProperty(category = "layout") 5977 public int topMargin; 5978 5979 /** 5980 * The right margin in pixels of the child. 5981 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5982 * to this field. 5983 */ 5984 @ViewDebug.ExportedProperty(category = "layout") 5985 public int rightMargin; 5986 5987 /** 5988 * The bottom margin in pixels of the child. 5989 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5990 * to this field. 5991 */ 5992 @ViewDebug.ExportedProperty(category = "layout") 5993 public int bottomMargin; 5994 5995 /** 5996 * The start margin in pixels of the child. 5997 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5998 * to this field. 5999 */ 6000 @ViewDebug.ExportedProperty(category = "layout") 6001 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6002 6003 /** 6004 * The end margin in pixels of the child. 6005 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6006 * to this field. 6007 */ 6008 @ViewDebug.ExportedProperty(category = "layout") 6009 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6010 6011 /** 6012 * The default start and end margin. 6013 * @hide 6014 */ 6015 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6016 6017 /** 6018 * Bit 0: layout direction 6019 * Bit 1: layout direction 6020 * Bit 2: left margin undefined 6021 * Bit 3: right margin undefined 6022 * Bit 4: is RTL compatibility mode 6023 * Bit 5: need resolution 6024 * 6025 * Bit 6 to 7 not used 6026 * 6027 * @hide 6028 */ 6029 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6030 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6031 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6032 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6033 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6034 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6035 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6036 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6037 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6038 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6039 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6040 }) 6041 byte mMarginFlags; 6042 6043 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6044 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6045 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6046 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6047 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6048 6049 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6050 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6051 6052 /** 6053 * Creates a new set of layout parameters. The values are extracted from 6054 * the supplied attributes set and context. 6055 * 6056 * @param c the application environment 6057 * @param attrs the set of attributes from which to extract the layout 6058 * parameters' values 6059 */ 6060 public MarginLayoutParams(Context c, AttributeSet attrs) { 6061 super(); 6062 6063 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6064 setBaseAttributes(a, 6065 R.styleable.ViewGroup_MarginLayout_layout_width, 6066 R.styleable.ViewGroup_MarginLayout_layout_height); 6067 6068 int margin = a.getDimensionPixelSize( 6069 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6070 if (margin >= 0) { 6071 leftMargin = margin; 6072 topMargin = margin; 6073 rightMargin= margin; 6074 bottomMargin = margin; 6075 } else { 6076 leftMargin = a.getDimensionPixelSize( 6077 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6078 UNDEFINED_MARGIN); 6079 if (leftMargin == UNDEFINED_MARGIN) { 6080 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6081 leftMargin = DEFAULT_MARGIN_RESOLVED; 6082 } 6083 rightMargin = a.getDimensionPixelSize( 6084 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6085 UNDEFINED_MARGIN); 6086 if (rightMargin == UNDEFINED_MARGIN) { 6087 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6088 rightMargin = DEFAULT_MARGIN_RESOLVED; 6089 } 6090 6091 topMargin = a.getDimensionPixelSize( 6092 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6093 DEFAULT_MARGIN_RESOLVED); 6094 bottomMargin = a.getDimensionPixelSize( 6095 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6096 DEFAULT_MARGIN_RESOLVED); 6097 6098 startMargin = a.getDimensionPixelSize( 6099 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6100 DEFAULT_MARGIN_RELATIVE); 6101 endMargin = a.getDimensionPixelSize( 6102 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6103 DEFAULT_MARGIN_RELATIVE); 6104 6105 if (isMarginRelative()) { 6106 mMarginFlags |= NEED_RESOLUTION_MASK; 6107 } 6108 } 6109 6110 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6111 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6112 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6113 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6114 } 6115 6116 // Layout direction is LTR by default 6117 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6118 6119 a.recycle(); 6120 } 6121 6122 /** 6123 * {@inheritDoc} 6124 */ 6125 public MarginLayoutParams(int width, int height) { 6126 super(width, height); 6127 6128 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6129 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6130 6131 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6132 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6133 } 6134 6135 /** 6136 * Copy constructor. Clones the width, height and margin values of the source. 6137 * 6138 * @param source The layout params to copy from. 6139 */ 6140 public MarginLayoutParams(MarginLayoutParams source) { 6141 this.width = source.width; 6142 this.height = source.height; 6143 6144 this.leftMargin = source.leftMargin; 6145 this.topMargin = source.topMargin; 6146 this.rightMargin = source.rightMargin; 6147 this.bottomMargin = source.bottomMargin; 6148 this.startMargin = source.startMargin; 6149 this.endMargin = source.endMargin; 6150 6151 this.mMarginFlags = source.mMarginFlags; 6152 } 6153 6154 /** 6155 * {@inheritDoc} 6156 */ 6157 public MarginLayoutParams(LayoutParams source) { 6158 super(source); 6159 6160 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6161 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6162 6163 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6164 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6165 } 6166 6167 /** 6168 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6169 * to be done so that the new margins are taken into account. Left and right margins may be 6170 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6171 * 6172 * @param left the left margin size 6173 * @param top the top margin size 6174 * @param right the right margin size 6175 * @param bottom the bottom margin size 6176 * 6177 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6178 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6179 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6180 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6181 */ 6182 public void setMargins(int left, int top, int right, int bottom) { 6183 leftMargin = left; 6184 topMargin = top; 6185 rightMargin = right; 6186 bottomMargin = bottom; 6187 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6188 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6189 if (isMarginRelative()) { 6190 mMarginFlags |= NEED_RESOLUTION_MASK; 6191 } else { 6192 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6193 } 6194 } 6195 6196 /** 6197 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6198 * needs to be done so that the new relative margins are taken into account. Left and right 6199 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6200 * direction. 6201 * 6202 * @param start the start margin size 6203 * @param top the top margin size 6204 * @param end the right margin size 6205 * @param bottom the bottom margin size 6206 * 6207 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6208 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6209 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6210 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6211 * 6212 * @hide 6213 */ 6214 public void setMarginsRelative(int start, int top, int end, int bottom) { 6215 startMargin = start; 6216 topMargin = top; 6217 endMargin = end; 6218 bottomMargin = bottom; 6219 mMarginFlags |= NEED_RESOLUTION_MASK; 6220 } 6221 6222 /** 6223 * Sets the relative start margin. 6224 * 6225 * @param start the start margin size 6226 * 6227 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6228 */ 6229 public void setMarginStart(int start) { 6230 startMargin = start; 6231 mMarginFlags |= NEED_RESOLUTION_MASK; 6232 } 6233 6234 /** 6235 * Returns the start margin in pixels. 6236 * 6237 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6238 * 6239 * @return the start margin in pixels. 6240 */ 6241 public int getMarginStart() { 6242 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6243 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6244 doResolveMargins(); 6245 } 6246 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6247 case View.LAYOUT_DIRECTION_RTL: 6248 return rightMargin; 6249 case View.LAYOUT_DIRECTION_LTR: 6250 default: 6251 return leftMargin; 6252 } 6253 } 6254 6255 /** 6256 * Sets the relative end margin. 6257 * 6258 * @param end the end margin size 6259 * 6260 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6261 */ 6262 public void setMarginEnd(int end) { 6263 endMargin = end; 6264 mMarginFlags |= NEED_RESOLUTION_MASK; 6265 } 6266 6267 /** 6268 * Returns the end margin in pixels. 6269 * 6270 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6271 * 6272 * @return the end margin in pixels. 6273 */ 6274 public int getMarginEnd() { 6275 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6276 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6277 doResolveMargins(); 6278 } 6279 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6280 case View.LAYOUT_DIRECTION_RTL: 6281 return leftMargin; 6282 case View.LAYOUT_DIRECTION_LTR: 6283 default: 6284 return rightMargin; 6285 } 6286 } 6287 6288 /** 6289 * Check if margins are relative. 6290 * 6291 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6292 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6293 * 6294 * @return true if either marginStart or marginEnd has been set. 6295 */ 6296 public boolean isMarginRelative() { 6297 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6298 } 6299 6300 /** 6301 * Set the layout direction 6302 * @param layoutDirection the layout direction. 6303 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6304 * or {@link View#LAYOUT_DIRECTION_RTL}. 6305 */ 6306 public void setLayoutDirection(int layoutDirection) { 6307 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6308 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6309 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6310 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6311 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6312 if (isMarginRelative()) { 6313 mMarginFlags |= NEED_RESOLUTION_MASK; 6314 } else { 6315 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6316 } 6317 } 6318 } 6319 6320 /** 6321 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6322 * {@link View#LAYOUT_DIRECTION_RTL}. 6323 * 6324 * @return the layout direction. 6325 */ 6326 public int getLayoutDirection() { 6327 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6328 } 6329 6330 /** 6331 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6332 * may be overridden depending on layout direction. 6333 */ 6334 @Override 6335 public void resolveLayoutDirection(int layoutDirection) { 6336 setLayoutDirection(layoutDirection); 6337 6338 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6339 // Will use the left and right margins if no relative margin is defined. 6340 if (!isMarginRelative() || 6341 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6342 6343 // Proceed with resolution 6344 doResolveMargins(); 6345 } 6346 6347 private void doResolveMargins() { 6348 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 6349 // if left or right margins are not defined and if we have some start or end margin 6350 // defined then use those start and end margins. 6351 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 6352 && startMargin > DEFAULT_MARGIN_RELATIVE) { 6353 leftMargin = startMargin; 6354 } 6355 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 6356 && endMargin > DEFAULT_MARGIN_RELATIVE) { 6357 rightMargin = endMargin; 6358 } 6359 } else { 6360 // We have some relative margins (either the start one or the end one or both). So use 6361 // them and override what has been defined for left and right margins. If either start 6362 // or end margin is not defined, just set it to default "0". 6363 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6364 case View.LAYOUT_DIRECTION_RTL: 6365 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6366 endMargin : DEFAULT_MARGIN_RESOLVED; 6367 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6368 startMargin : DEFAULT_MARGIN_RESOLVED; 6369 break; 6370 case View.LAYOUT_DIRECTION_LTR: 6371 default: 6372 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6373 startMargin : DEFAULT_MARGIN_RESOLVED; 6374 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6375 endMargin : DEFAULT_MARGIN_RESOLVED; 6376 break; 6377 } 6378 } 6379 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6380 } 6381 6382 /** 6383 * @hide 6384 */ 6385 public boolean isLayoutRtl() { 6386 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 6387 } 6388 6389 /** 6390 * @hide 6391 */ 6392 @Override 6393 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6394 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6395 6396 fillDifference(canvas, 6397 view.getLeft() + oi.left, 6398 view.getTop() + oi.top, 6399 view.getRight() - oi.right, 6400 view.getBottom() - oi.bottom, 6401 leftMargin, 6402 topMargin, 6403 rightMargin, 6404 bottomMargin, 6405 paint); 6406 } 6407 } 6408 6409 /* Describes a touched view and the ids of the pointers that it has captured. 6410 * 6411 * This code assumes that pointer ids are always in the range 0..31 such that 6412 * it can use a bitfield to track which pointer ids are present. 6413 * As it happens, the lower layers of the input dispatch pipeline also use the 6414 * same trick so the assumption should be safe here... 6415 */ 6416 private static final class TouchTarget { 6417 private static final int MAX_RECYCLED = 32; 6418 private static final Object sRecycleLock = new Object(); 6419 private static TouchTarget sRecycleBin; 6420 private static int sRecycledCount; 6421 6422 public static final int ALL_POINTER_IDS = -1; // all ones 6423 6424 // The touched child view. 6425 public View child; 6426 6427 // The combined bit mask of pointer ids for all pointers captured by the target. 6428 public int pointerIdBits; 6429 6430 // The next target in the target list. 6431 public TouchTarget next; 6432 6433 private TouchTarget() { 6434 } 6435 6436 public static TouchTarget obtain(View child, int pointerIdBits) { 6437 final TouchTarget target; 6438 synchronized (sRecycleLock) { 6439 if (sRecycleBin == null) { 6440 target = new TouchTarget(); 6441 } else { 6442 target = sRecycleBin; 6443 sRecycleBin = target.next; 6444 sRecycledCount--; 6445 target.next = null; 6446 } 6447 } 6448 target.child = child; 6449 target.pointerIdBits = pointerIdBits; 6450 return target; 6451 } 6452 6453 public void recycle() { 6454 synchronized (sRecycleLock) { 6455 if (sRecycledCount < MAX_RECYCLED) { 6456 next = sRecycleBin; 6457 sRecycleBin = this; 6458 sRecycledCount += 1; 6459 } else { 6460 next = null; 6461 } 6462 child = null; 6463 } 6464 } 6465 } 6466 6467 /* Describes a hovered view. */ 6468 private static final class HoverTarget { 6469 private static final int MAX_RECYCLED = 32; 6470 private static final Object sRecycleLock = new Object(); 6471 private static HoverTarget sRecycleBin; 6472 private static int sRecycledCount; 6473 6474 // The hovered child view. 6475 public View child; 6476 6477 // The next target in the target list. 6478 public HoverTarget next; 6479 6480 private HoverTarget() { 6481 } 6482 6483 public static HoverTarget obtain(View child) { 6484 final HoverTarget target; 6485 synchronized (sRecycleLock) { 6486 if (sRecycleBin == null) { 6487 target = new HoverTarget(); 6488 } else { 6489 target = sRecycleBin; 6490 sRecycleBin = target.next; 6491 sRecycledCount--; 6492 target.next = null; 6493 } 6494 } 6495 target.child = child; 6496 return target; 6497 } 6498 6499 public void recycle() { 6500 synchronized (sRecycleLock) { 6501 if (sRecycledCount < MAX_RECYCLED) { 6502 next = sRecycleBin; 6503 sRecycleBin = this; 6504 sRecycledCount += 1; 6505 } else { 6506 next = null; 6507 } 6508 child = null; 6509 } 6510 } 6511 } 6512 6513 /** 6514 * Pooled class that orderes the children of a ViewGroup from start 6515 * to end based on how they are laid out and the layout direction. 6516 */ 6517 static class ChildListForAccessibility { 6518 6519 private static final int MAX_POOL_SIZE = 32; 6520 6521 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6522 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6523 6524 private final ArrayList<View> mChildren = new ArrayList<View>(); 6525 6526 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6527 6528 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6529 ChildListForAccessibility list = sPool.acquire(); 6530 if (list == null) { 6531 list = new ChildListForAccessibility(); 6532 } 6533 list.init(parent, sort); 6534 return list; 6535 } 6536 6537 public void recycle() { 6538 clear(); 6539 sPool.release(this); 6540 } 6541 6542 public int getChildCount() { 6543 return mChildren.size(); 6544 } 6545 6546 public View getChildAt(int index) { 6547 return mChildren.get(index); 6548 } 6549 6550 public int getChildIndex(View child) { 6551 return mChildren.indexOf(child); 6552 } 6553 6554 private void init(ViewGroup parent, boolean sort) { 6555 ArrayList<View> children = mChildren; 6556 final int childCount = parent.getChildCount(); 6557 for (int i = 0; i < childCount; i++) { 6558 View child = parent.getChildAt(i); 6559 children.add(child); 6560 } 6561 if (sort) { 6562 ArrayList<ViewLocationHolder> holders = mHolders; 6563 for (int i = 0; i < childCount; i++) { 6564 View child = children.get(i); 6565 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6566 holders.add(holder); 6567 } 6568 Collections.sort(holders); 6569 for (int i = 0; i < childCount; i++) { 6570 ViewLocationHolder holder = holders.get(i); 6571 children.set(i, holder.mView); 6572 holder.recycle(); 6573 } 6574 holders.clear(); 6575 } 6576 } 6577 6578 private void clear() { 6579 mChildren.clear(); 6580 } 6581 } 6582 6583 /** 6584 * Pooled class that holds a View and its location with respect to 6585 * a specified root. This enables sorting of views based on their 6586 * coordinates without recomputing the position relative to the root 6587 * on every comparison. 6588 */ 6589 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6590 6591 private static final int MAX_POOL_SIZE = 32; 6592 6593 private static final SynchronizedPool<ViewLocationHolder> sPool = 6594 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6595 6596 private final Rect mLocation = new Rect(); 6597 6598 public View mView; 6599 6600 private int mLayoutDirection; 6601 6602 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6603 ViewLocationHolder holder = sPool.acquire(); 6604 if (holder == null) { 6605 holder = new ViewLocationHolder(); 6606 } 6607 holder.init(root, view); 6608 return holder; 6609 } 6610 6611 public void recycle() { 6612 clear(); 6613 sPool.release(this); 6614 } 6615 6616 @Override 6617 public int compareTo(ViewLocationHolder another) { 6618 // This instance is greater than an invalid argument. 6619 if (another == null) { 6620 return 1; 6621 } 6622 if (getClass() != another.getClass()) { 6623 return 1; 6624 } 6625 // First is above second. 6626 if (mLocation.bottom - another.mLocation.top <= 0) { 6627 return -1; 6628 } 6629 // First is below second. 6630 if (mLocation.top - another.mLocation.bottom >= 0) { 6631 return 1; 6632 } 6633 // LTR 6634 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6635 final int leftDifference = mLocation.left - another.mLocation.left; 6636 // First more to the left than second. 6637 if (leftDifference != 0) { 6638 return leftDifference; 6639 } 6640 } else { // RTL 6641 final int rightDifference = mLocation.right - another.mLocation.right; 6642 // First more to the right than second. 6643 if (rightDifference != 0) { 6644 return -rightDifference; 6645 } 6646 } 6647 // Break tie by top. 6648 final int topDiference = mLocation.top - another.mLocation.top; 6649 if (topDiference != 0) { 6650 return topDiference; 6651 } 6652 // Break tie by height. 6653 final int heightDiference = mLocation.height() - another.mLocation.height(); 6654 if (heightDiference != 0) { 6655 return -heightDiference; 6656 } 6657 // Break tie by width. 6658 final int widthDiference = mLocation.width() - another.mLocation.width(); 6659 if (widthDiference != 0) { 6660 return -widthDiference; 6661 } 6662 // Just break the tie somehow. The accessibliity ids are unique 6663 // and stable, hence this is deterministic tie breaking. 6664 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6665 } 6666 6667 private void init(ViewGroup root, View view) { 6668 Rect viewLocation = mLocation; 6669 view.getDrawingRect(viewLocation); 6670 root.offsetDescendantRectToMyCoords(view, viewLocation); 6671 mView = view; 6672 mLayoutDirection = root.getLayoutDirection(); 6673 } 6674 6675 private void clear() { 6676 mView = null; 6677 mLocation.set(0, 0, 0, 0); 6678 } 6679 } 6680 6681 private static Paint getDebugPaint() { 6682 if (sDebugPaint == null) { 6683 sDebugPaint = new Paint(); 6684 sDebugPaint.setAntiAlias(false); 6685 } 6686 return sDebugPaint; 6687 } 6688 6689 private void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6690 if (sDebugLines== null) { 6691 sDebugLines = new float[16]; 6692 } 6693 6694 sDebugLines[0] = x1; 6695 sDebugLines[1] = y1; 6696 sDebugLines[2] = x2; 6697 sDebugLines[3] = y1; 6698 6699 sDebugLines[4] = x2; 6700 sDebugLines[5] = y1; 6701 sDebugLines[6] = x2; 6702 sDebugLines[7] = y2; 6703 6704 sDebugLines[8] = x2; 6705 sDebugLines[9] = y2; 6706 sDebugLines[10] = x1; 6707 sDebugLines[11] = y2; 6708 6709 sDebugLines[12] = x1; 6710 sDebugLines[13] = y2; 6711 sDebugLines[14] = x1; 6712 sDebugLines[15] = y1; 6713 6714 canvas.drawLines(sDebugLines, paint); 6715 } 6716} 6717