ViewGroup.java revision fee6f2b3d30fe222486a70a773683e21d9dd12bf
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 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 101 * @attr ref android.R.styleable#ViewGroup_layoutMode 102 */ 103public abstract class ViewGroup extends View implements ViewParent, ViewManager { 104 private static final String TAG = "ViewGroup"; 105 106 private static final boolean DBG = false; 107 /** @hide */ 108 public static boolean DEBUG_DRAW = false; 109 110 /** 111 * Views which have been hidden or removed which need to be animated on 112 * their way out. 113 * This field should be made private, so it is hidden from the SDK. 114 * {@hide} 115 */ 116 protected ArrayList<View> mDisappearingChildren; 117 118 /** 119 * Listener used to propagate events indicating when children are added 120 * and/or removed from a view group. 121 * This field should be made private, so it is hidden from the SDK. 122 * {@hide} 123 */ 124 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 125 126 // The view contained within this ViewGroup that has or contains focus. 127 private View mFocused; 128 129 /** 130 * A Transformation used when drawing children, to 131 * apply on the child being drawn. 132 */ 133 private Transformation mChildTransformation; 134 135 /** 136 * Used to track the current invalidation region. 137 */ 138 RectF mInvalidateRegion; 139 140 /** 141 * A Transformation used to calculate a correct 142 * invalidation area when the application is autoscaled. 143 */ 144 Transformation mInvalidationTransformation; 145 146 // View currently under an ongoing drag 147 private View mCurrentDragView; 148 149 // Metadata about the ongoing drag 150 private DragEvent mCurrentDrag; 151 private HashSet<View> mDragNotifiedChildren; 152 153 // Does this group have a child that can accept the current drag payload? 154 private boolean mChildAcceptsDrag; 155 156 // Used during drag dispatch 157 private PointF mLocalPoint; 158 159 // Layout animation 160 private LayoutAnimationController mLayoutAnimationController; 161 private Animation.AnimationListener mAnimationListener; 162 163 // First touch target in the linked list of touch targets. 164 private TouchTarget mFirstTouchTarget; 165 166 // For debugging only. You can see these in hierarchyviewer. 167 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 168 @ViewDebug.ExportedProperty(category = "events") 169 private long mLastTouchDownTime; 170 @ViewDebug.ExportedProperty(category = "events") 171 private int mLastTouchDownIndex = -1; 172 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 173 @ViewDebug.ExportedProperty(category = "events") 174 private float mLastTouchDownX; 175 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 176 @ViewDebug.ExportedProperty(category = "events") 177 private float mLastTouchDownY; 178 179 // First hover target in the linked list of hover targets. 180 // The hover targets are children which have received ACTION_HOVER_ENTER. 181 // They might not have actually handled the hover event, but we will 182 // continue sending hover events to them as long as the pointer remains over 183 // their bounds and the view group does not intercept hover. 184 private HoverTarget mFirstHoverTarget; 185 186 // True if the view group itself received a hover event. 187 // It might not have actually handled the hover event. 188 private boolean mHoveredSelf; 189 190 /** 191 * Internal flags. 192 * 193 * This field should be made private, so it is hidden from the SDK. 194 * {@hide} 195 */ 196 @ViewDebug.ExportedProperty(flagMapping = { 197 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 198 name = "CLIP_CHILDREN"), 199 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 200 name = "CLIP_TO_PADDING"), 201 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 202 name = "PADDING_NOT_NULL") 203 }) 204 protected int mGroupFlags; 205 206 /** 207 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 208 */ 209 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 210 211 /** 212 * NOTE: If you change the flags below make sure to reflect the changes 213 * the DisplayList class 214 */ 215 216 // When set, ViewGroup invalidates only the child's rectangle 217 // Set by default 218 static final int FLAG_CLIP_CHILDREN = 0x1; 219 220 // When set, ViewGroup excludes the padding area from the invalidate rectangle 221 // Set by default 222 private static final int FLAG_CLIP_TO_PADDING = 0x2; 223 224 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 225 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 226 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 227 228 // When set, dispatchDraw() will run the layout animation and unset the flag 229 private static final int FLAG_RUN_ANIMATION = 0x8; 230 231 // When set, there is either no layout animation on the ViewGroup or the layout 232 // animation is over 233 // Set by default 234 static final int FLAG_ANIMATION_DONE = 0x10; 235 236 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 237 // to clip it, even if FLAG_CLIP_TO_PADDING is set 238 private static final int FLAG_PADDING_NOT_NULL = 0x20; 239 240 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 241 // Set by default 242 private static final int FLAG_ANIMATION_CACHE = 0x40; 243 244 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 245 // layout animation; this avoid clobbering the hierarchy 246 // Automatically set when the layout animation starts, depending on the animation's 247 // characteristics 248 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 249 250 // When set, the next call to drawChild() will clear mChildTransformation's matrix 251 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 252 253 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 254 // the children's Bitmap caches if necessary 255 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 256 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 257 258 /** 259 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 260 * to get the index of the child to draw for that iteration. 261 * 262 * @hide 263 */ 264 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 265 266 /** 267 * When set, this ViewGroup supports static transformations on children; this causes 268 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 269 * invoked when a child is drawn. 270 * 271 * Any subclass overriding 272 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 273 * set this flags in {@link #mGroupFlags}. 274 * 275 * {@hide} 276 */ 277 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 278 279 // When the previous drawChild() invocation used an alpha value that was lower than 280 // 1.0 and set it in mCachePaint 281 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 282 283 /** 284 * When set, this ViewGroup's drawable states also include those 285 * of its children. 286 */ 287 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 288 289 /** 290 * When set, this ViewGroup tries to always draw its children using their drawing cache. 291 */ 292 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 293 294 /** 295 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 296 * draw its children with their drawing cache. 297 */ 298 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 299 300 /** 301 * When set, this group will go through its list of children to notify them of 302 * any drawable state change. 303 */ 304 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 305 306 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 307 308 /** 309 * This view will get focus before any of its descendants. 310 */ 311 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 312 313 /** 314 * This view will get focus only if none of its descendants want it. 315 */ 316 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 317 318 /** 319 * This view will block any of its descendants from getting focus, even 320 * if they are focusable. 321 */ 322 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 323 324 /** 325 * Used to map between enum in attrubutes and flag values. 326 */ 327 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 328 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 329 FOCUS_BLOCK_DESCENDANTS}; 330 331 /** 332 * When set, this ViewGroup should not intercept touch events. 333 * {@hide} 334 */ 335 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 336 337 /** 338 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 339 */ 340 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 341 342 /** 343 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 344 * to children when adding new views. This is used to prevent multiple 345 * onAttached calls when a ViewGroup adds children in its own onAttached method. 346 */ 347 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 348 349 /** 350 * When true, indicates that a layoutMode has been explicitly set, either with 351 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 352 * This distinguishes the situation in which a layout mode was inherited from 353 * one of the ViewGroup's ancestors and cached locally. 354 */ 355 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 356 357 /** 358 * Indicates which types of drawing caches are to be kept in memory. 359 * This field should be made private, so it is hidden from the SDK. 360 * {@hide} 361 */ 362 protected int mPersistentDrawingCache; 363 364 /** 365 * Used to indicate that no drawing cache should be kept in memory. 366 */ 367 public static final int PERSISTENT_NO_CACHE = 0x0; 368 369 /** 370 * Used to indicate that the animation drawing cache should be kept in memory. 371 */ 372 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 373 374 /** 375 * Used to indicate that the scrolling drawing cache should be kept in memory. 376 */ 377 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 378 379 /** 380 * Used to indicate that all drawing caches should be kept in memory. 381 */ 382 public static final int PERSISTENT_ALL_CACHES = 0x3; 383 384 // Layout Modes 385 386 private static final int LAYOUT_MODE_UNDEFINED = -1; 387 388 /** 389 * This constant is a {@link #setLayoutMode(int) layoutMode}. 390 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 391 * {@link #getRight() right} and {@link #getBottom() bottom}. 392 */ 393 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 394 395 /** 396 * This constant is a {@link #setLayoutMode(int) layoutMode}. 397 * Optical bounds describe where a widget appears to be. They sit inside the clip 398 * bounds which need to cover a larger area to allow other effects, 399 * such as shadows and glows, to be drawn. 400 */ 401 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 402 403 /** @hide */ 404 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 405 406 /** 407 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 408 * are set at the same time. 409 */ 410 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 411 412 // Index of the child's left position in the mLocation array 413 private static final int CHILD_LEFT_INDEX = 0; 414 // Index of the child's top position in the mLocation array 415 private static final int CHILD_TOP_INDEX = 1; 416 417 // Child views of this ViewGroup 418 private View[] mChildren; 419 // Number of valid children in the mChildren array, the rest should be null or not 420 // considered as children 421 private int mChildrenCount; 422 423 // Whether layout calls are currently being suppressed, controlled by calls to 424 // suppressLayout() 425 boolean mSuppressLayout = false; 426 427 // Whether any layout calls have actually been suppressed while mSuppressLayout 428 // has been true. This tracks whether we need to issue a requestLayout() when 429 // layout is later re-enabled. 430 private boolean mLayoutCalledWhileSuppressed = false; 431 432 private static final int ARRAY_INITIAL_CAPACITY = 12; 433 private static final int ARRAY_CAPACITY_INCREMENT = 12; 434 435 private static Paint sDebugPaint; 436 private static float[] sDebugLines; 437 438 // Used to draw cached views 439 Paint mCachePaint; 440 441 // Used to animate add/remove changes in layout 442 private LayoutTransition mTransition; 443 444 // The set of views that are currently being transitioned. This list is used to track views 445 // being removed that should not actually be removed from the parent yet because they are 446 // being animated. 447 private ArrayList<View> mTransitioningViews; 448 449 // List of children changing visibility. This is used to potentially keep rendering 450 // views during a transition when they otherwise would have become gone/invisible 451 private ArrayList<View> mVisibilityChangingChildren; 452 453 // Indicates how many of this container's child subtrees contain transient state 454 @ViewDebug.ExportedProperty(category = "layout") 455 private int mChildCountWithTransientState = 0; 456 457 public ViewGroup(Context context) { 458 super(context); 459 initViewGroup(); 460 } 461 462 public ViewGroup(Context context, AttributeSet attrs) { 463 super(context, attrs); 464 initViewGroup(); 465 initFromAttributes(context, attrs); 466 } 467 468 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 469 super(context, attrs, defStyle); 470 initViewGroup(); 471 initFromAttributes(context, attrs); 472 } 473 474 private boolean debugDraw() { 475 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 476 } 477 478 private void initViewGroup() { 479 // ViewGroup doesn't draw by default 480 if (!debugDraw()) { 481 setFlags(WILL_NOT_DRAW, DRAW_MASK); 482 } 483 mGroupFlags |= FLAG_CLIP_CHILDREN; 484 mGroupFlags |= FLAG_CLIP_TO_PADDING; 485 mGroupFlags |= FLAG_ANIMATION_DONE; 486 mGroupFlags |= FLAG_ANIMATION_CACHE; 487 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 488 489 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 490 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 491 } 492 493 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 494 495 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 496 mChildrenCount = 0; 497 498 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 499 } 500 501 private void initFromAttributes(Context context, AttributeSet attrs) { 502 TypedArray a = context.obtainStyledAttributes(attrs, 503 R.styleable.ViewGroup); 504 505 final int N = a.getIndexCount(); 506 for (int i = 0; i < N; i++) { 507 int attr = a.getIndex(i); 508 switch (attr) { 509 case R.styleable.ViewGroup_clipChildren: 510 setClipChildren(a.getBoolean(attr, true)); 511 break; 512 case R.styleable.ViewGroup_clipToPadding: 513 setClipToPadding(a.getBoolean(attr, true)); 514 break; 515 case R.styleable.ViewGroup_animationCache: 516 setAnimationCacheEnabled(a.getBoolean(attr, true)); 517 break; 518 case R.styleable.ViewGroup_persistentDrawingCache: 519 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 520 break; 521 case R.styleable.ViewGroup_addStatesFromChildren: 522 setAddStatesFromChildren(a.getBoolean(attr, false)); 523 break; 524 case R.styleable.ViewGroup_alwaysDrawnWithCache: 525 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 526 break; 527 case R.styleable.ViewGroup_layoutAnimation: 528 int id = a.getResourceId(attr, -1); 529 if (id > 0) { 530 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 531 } 532 break; 533 case R.styleable.ViewGroup_descendantFocusability: 534 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 535 break; 536 case R.styleable.ViewGroup_splitMotionEvents: 537 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 538 break; 539 case R.styleable.ViewGroup_animateLayoutChanges: 540 boolean animateLayoutChanges = a.getBoolean(attr, false); 541 if (animateLayoutChanges) { 542 setLayoutTransition(new LayoutTransition()); 543 } 544 break; 545 case R.styleable.ViewGroup_layoutMode: 546 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 547 break; 548 } 549 } 550 551 a.recycle(); 552 } 553 554 /** 555 * Gets the descendant focusability of this view group. The descendant 556 * focusability defines the relationship between this view group and its 557 * descendants when looking for a view to take focus in 558 * {@link #requestFocus(int, android.graphics.Rect)}. 559 * 560 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 561 * {@link #FOCUS_BLOCK_DESCENDANTS}. 562 */ 563 @ViewDebug.ExportedProperty(category = "focus", mapping = { 564 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 565 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 566 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 567 }) 568 public int getDescendantFocusability() { 569 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 570 } 571 572 /** 573 * Set the descendant focusability of this view group. This defines the relationship 574 * between this view group and its descendants when looking for a view to 575 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 576 * 577 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 578 * {@link #FOCUS_BLOCK_DESCENDANTS}. 579 */ 580 public void setDescendantFocusability(int focusability) { 581 switch (focusability) { 582 case FOCUS_BEFORE_DESCENDANTS: 583 case FOCUS_AFTER_DESCENDANTS: 584 case FOCUS_BLOCK_DESCENDANTS: 585 break; 586 default: 587 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 588 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 589 } 590 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 591 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 592 } 593 594 /** 595 * {@inheritDoc} 596 */ 597 @Override 598 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 599 if (mFocused != null) { 600 mFocused.unFocus(); 601 mFocused = null; 602 } 603 super.handleFocusGainInternal(direction, previouslyFocusedRect); 604 } 605 606 /** 607 * {@inheritDoc} 608 */ 609 public void requestChildFocus(View child, View focused) { 610 if (DBG) { 611 System.out.println(this + " requestChildFocus()"); 612 } 613 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 614 return; 615 } 616 617 // Unfocus us, if necessary 618 super.unFocus(); 619 620 // We had a previous notion of who had focus. Clear it. 621 if (mFocused != child) { 622 if (mFocused != null) { 623 mFocused.unFocus(); 624 } 625 626 mFocused = child; 627 } 628 if (mParent != null) { 629 mParent.requestChildFocus(this, focused); 630 } 631 } 632 633 /** 634 * {@inheritDoc} 635 */ 636 public void focusableViewAvailable(View v) { 637 if (mParent != null 638 // shortcut: don't report a new focusable view if we block our descendants from 639 // getting focus 640 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 641 // shortcut: don't report a new focusable view if we already are focused 642 // (and we don't prefer our descendants) 643 // 644 // note: knowing that mFocused is non-null is not a good enough reason 645 // to break the traversal since in that case we'd actually have to find 646 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 647 // an ancestor of v; this will get checked for at ViewAncestor 648 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 649 mParent.focusableViewAvailable(v); 650 } 651 } 652 653 /** 654 * {@inheritDoc} 655 */ 656 public boolean showContextMenuForChild(View originalView) { 657 return mParent != null && mParent.showContextMenuForChild(originalView); 658 } 659 660 /** 661 * {@inheritDoc} 662 */ 663 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 664 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 665 } 666 667 /** 668 * Find the nearest view in the specified direction that wants to take 669 * focus. 670 * 671 * @param focused The view that currently has focus 672 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 673 * FOCUS_RIGHT, or 0 for not applicable. 674 */ 675 public View focusSearch(View focused, int direction) { 676 if (isRootNamespace()) { 677 // root namespace means we should consider ourselves the top of the 678 // tree for focus searching; otherwise we could be focus searching 679 // into other tabs. see LocalActivityManager and TabHost for more info 680 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 681 } else if (mParent != null) { 682 return mParent.focusSearch(focused, direction); 683 } 684 return null; 685 } 686 687 /** 688 * {@inheritDoc} 689 */ 690 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 691 return false; 692 } 693 694 /** 695 * {@inheritDoc} 696 */ 697 @Override 698 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 699 ViewParent parent = mParent; 700 if (parent == null) { 701 return false; 702 } 703 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 704 if (!propagate) { 705 return false; 706 } 707 return parent.requestSendAccessibilityEvent(this, event); 708 } 709 710 /** 711 * Called when a child has requested sending an {@link AccessibilityEvent} and 712 * gives an opportunity to its parent to augment the event. 713 * <p> 714 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 715 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 716 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 717 * is responsible for handling this call. 718 * </p> 719 * 720 * @param child The child which requests sending the event. 721 * @param event The event to be sent. 722 * @return True if the event should be sent. 723 * 724 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 725 */ 726 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 727 if (mAccessibilityDelegate != null) { 728 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 729 } else { 730 return onRequestSendAccessibilityEventInternal(child, event); 731 } 732 } 733 734 /** 735 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 736 * 737 * Note: Called from the default {@link View.AccessibilityDelegate}. 738 */ 739 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 740 return true; 741 } 742 743 /** 744 * Called when a child view has changed whether or not it is tracking transient state. 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 @Override 766 public boolean hasTransientState() { 767 return mChildCountWithTransientState > 0 || super.hasTransientState(); 768 } 769 770 /** 771 * {@inheritDoc} 772 */ 773 @Override 774 public boolean dispatchUnhandledMove(View focused, int direction) { 775 return mFocused != null && 776 mFocused.dispatchUnhandledMove(focused, direction); 777 } 778 779 /** 780 * {@inheritDoc} 781 */ 782 public void clearChildFocus(View child) { 783 if (DBG) { 784 System.out.println(this + " clearChildFocus()"); 785 } 786 787 mFocused = null; 788 if (mParent != null) { 789 mParent.clearChildFocus(this); 790 } 791 } 792 793 /** 794 * {@inheritDoc} 795 */ 796 @Override 797 public void clearFocus() { 798 if (DBG) { 799 System.out.println(this + " clearFocus()"); 800 } 801 if (mFocused == null) { 802 super.clearFocus(); 803 } else { 804 View focused = mFocused; 805 mFocused = null; 806 focused.clearFocus(); 807 } 808 } 809 810 /** 811 * {@inheritDoc} 812 */ 813 @Override 814 void unFocus() { 815 if (DBG) { 816 System.out.println(this + " unFocus()"); 817 } 818 if (mFocused == null) { 819 super.unFocus(); 820 } else { 821 mFocused.unFocus(); 822 mFocused = null; 823 } 824 } 825 826 /** 827 * Returns the focused child of this view, if any. The child may have focus 828 * or contain focus. 829 * 830 * @return the focused child or null. 831 */ 832 public View getFocusedChild() { 833 return mFocused; 834 } 835 836 /** 837 * Returns true if this view has or contains focus 838 * 839 * @return true if this view has or contains focus 840 */ 841 @Override 842 public boolean hasFocus() { 843 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 844 } 845 846 /* 847 * (non-Javadoc) 848 * 849 * @see android.view.View#findFocus() 850 */ 851 @Override 852 public View findFocus() { 853 if (DBG) { 854 System.out.println("Find focus in " + this + ": flags=" 855 + isFocused() + ", child=" + mFocused); 856 } 857 858 if (isFocused()) { 859 return this; 860 } 861 862 if (mFocused != null) { 863 return mFocused.findFocus(); 864 } 865 return null; 866 } 867 868 /** 869 * {@inheritDoc} 870 */ 871 @Override 872 public boolean hasFocusable() { 873 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 874 return false; 875 } 876 877 if (isFocusable()) { 878 return true; 879 } 880 881 final int descendantFocusability = getDescendantFocusability(); 882 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 883 final int count = mChildrenCount; 884 final View[] children = mChildren; 885 886 for (int i = 0; i < count; i++) { 887 final View child = children[i]; 888 if (child.hasFocusable()) { 889 return true; 890 } 891 } 892 } 893 894 return false; 895 } 896 897 /** 898 * {@inheritDoc} 899 */ 900 @Override 901 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 902 final int focusableCount = views.size(); 903 904 final int descendantFocusability = getDescendantFocusability(); 905 906 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 907 final int count = mChildrenCount; 908 final View[] children = mChildren; 909 910 for (int i = 0; i < count; i++) { 911 final View child = children[i]; 912 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 913 child.addFocusables(views, direction, focusableMode); 914 } 915 } 916 } 917 918 // we add ourselves (if focusable) in all cases except for when we are 919 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 920 // to avoid the focus search finding layouts when a more precise search 921 // among the focusable children would be more interesting. 922 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 923 // No focusable descendants 924 || (focusableCount == views.size())) { 925 super.addFocusables(views, direction, focusableMode); 926 } 927 } 928 929 @Override 930 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 931 super.findViewsWithText(outViews, text, flags); 932 final int childrenCount = mChildrenCount; 933 final View[] children = mChildren; 934 for (int i = 0; i < childrenCount; i++) { 935 View child = children[i]; 936 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 937 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 938 child.findViewsWithText(outViews, text, flags); 939 } 940 } 941 } 942 943 /** @hide */ 944 @Override 945 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 946 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 947 if (foundView != null) { 948 return foundView; 949 } 950 final int childrenCount = mChildrenCount; 951 final View[] children = mChildren; 952 for (int i = 0; i < childrenCount; i++) { 953 View child = children[i]; 954 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 955 if (foundView != null) { 956 return foundView; 957 } 958 } 959 return null; 960 } 961 962 /** 963 * {@inheritDoc} 964 */ 965 @Override 966 public void dispatchWindowFocusChanged(boolean hasFocus) { 967 super.dispatchWindowFocusChanged(hasFocus); 968 final int count = mChildrenCount; 969 final View[] children = mChildren; 970 for (int i = 0; i < count; i++) { 971 children[i].dispatchWindowFocusChanged(hasFocus); 972 } 973 } 974 975 /** 976 * {@inheritDoc} 977 */ 978 @Override 979 public void addTouchables(ArrayList<View> views) { 980 super.addTouchables(views); 981 982 final int count = mChildrenCount; 983 final View[] children = mChildren; 984 985 for (int i = 0; i < count; i++) { 986 final View child = children[i]; 987 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 988 child.addTouchables(views); 989 } 990 } 991 } 992 993 /** 994 * @hide 995 */ 996 @Override 997 public void makeOptionalFitsSystemWindows() { 998 super.makeOptionalFitsSystemWindows(); 999 final int count = mChildrenCount; 1000 final View[] children = mChildren; 1001 for (int i = 0; i < count; i++) { 1002 children[i].makeOptionalFitsSystemWindows(); 1003 } 1004 } 1005 1006 /** 1007 * {@inheritDoc} 1008 */ 1009 @Override 1010 public void dispatchDisplayHint(int hint) { 1011 super.dispatchDisplayHint(hint); 1012 final int count = mChildrenCount; 1013 final View[] children = mChildren; 1014 for (int i = 0; i < count; i++) { 1015 children[i].dispatchDisplayHint(hint); 1016 } 1017 } 1018 1019 /** 1020 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1021 * action. 1022 * 1023 * @param child The view whose visibility has changed 1024 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1025 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1026 * @hide 1027 */ 1028 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1029 if (mTransition != null) { 1030 if (newVisibility == VISIBLE) { 1031 mTransition.showChild(this, child, oldVisibility); 1032 } else { 1033 mTransition.hideChild(this, child, newVisibility); 1034 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1035 // Only track this on disappearing views - appearing views are already visible 1036 // and don't need special handling during drawChild() 1037 if (mVisibilityChangingChildren == null) { 1038 mVisibilityChangingChildren = new ArrayList<View>(); 1039 } 1040 mVisibilityChangingChildren.add(child); 1041 addDisappearingView(child); 1042 } 1043 } 1044 } 1045 1046 // in all cases, for drags 1047 if (mCurrentDrag != null) { 1048 if (newVisibility == VISIBLE) { 1049 notifyChildOfDrag(child); 1050 } 1051 } 1052 } 1053 1054 /** 1055 * {@inheritDoc} 1056 */ 1057 @Override 1058 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1059 super.dispatchVisibilityChanged(changedView, visibility); 1060 final int count = mChildrenCount; 1061 final View[] children = mChildren; 1062 for (int i = 0; i < count; i++) { 1063 children[i].dispatchVisibilityChanged(changedView, visibility); 1064 } 1065 } 1066 1067 /** 1068 * {@inheritDoc} 1069 */ 1070 @Override 1071 public void dispatchWindowVisibilityChanged(int visibility) { 1072 super.dispatchWindowVisibilityChanged(visibility); 1073 final int count = mChildrenCount; 1074 final View[] children = mChildren; 1075 for (int i = 0; i < count; i++) { 1076 children[i].dispatchWindowVisibilityChanged(visibility); 1077 } 1078 } 1079 1080 /** 1081 * {@inheritDoc} 1082 */ 1083 @Override 1084 public void dispatchConfigurationChanged(Configuration newConfig) { 1085 super.dispatchConfigurationChanged(newConfig); 1086 final int count = mChildrenCount; 1087 final View[] children = mChildren; 1088 for (int i = 0; i < count; i++) { 1089 children[i].dispatchConfigurationChanged(newConfig); 1090 } 1091 } 1092 1093 /** 1094 * {@inheritDoc} 1095 */ 1096 public void recomputeViewAttributes(View child) { 1097 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1098 ViewParent parent = mParent; 1099 if (parent != null) parent.recomputeViewAttributes(this); 1100 } 1101 } 1102 1103 @Override 1104 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1105 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1106 super.dispatchCollectViewAttributes(attachInfo, visibility); 1107 final int count = mChildrenCount; 1108 final View[] children = mChildren; 1109 for (int i = 0; i < count; i++) { 1110 final View child = children[i]; 1111 child.dispatchCollectViewAttributes(attachInfo, 1112 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1113 } 1114 } 1115 } 1116 1117 /** 1118 * {@inheritDoc} 1119 */ 1120 public void bringChildToFront(View child) { 1121 int index = indexOfChild(child); 1122 if (index >= 0) { 1123 removeFromArray(index); 1124 addInArray(child, mChildrenCount); 1125 child.mParent = this; 1126 } 1127 } 1128 1129 private PointF getLocalPoint() { 1130 if (mLocalPoint == null) mLocalPoint = new PointF(); 1131 return mLocalPoint; 1132 } 1133 1134 /** 1135 * {@inheritDoc} 1136 */ 1137 // TODO: Write real docs 1138 @Override 1139 public boolean dispatchDragEvent(DragEvent event) { 1140 boolean retval = false; 1141 final float tx = event.mX; 1142 final float ty = event.mY; 1143 1144 ViewRootImpl root = getViewRootImpl(); 1145 1146 // Dispatch down the view hierarchy 1147 final PointF localPoint = getLocalPoint(); 1148 1149 switch (event.mAction) { 1150 case DragEvent.ACTION_DRAG_STARTED: { 1151 // clear state to recalculate which views we drag over 1152 mCurrentDragView = null; 1153 1154 // Set up our tracking of drag-started notifications 1155 mCurrentDrag = DragEvent.obtain(event); 1156 if (mDragNotifiedChildren == null) { 1157 mDragNotifiedChildren = new HashSet<View>(); 1158 } else { 1159 mDragNotifiedChildren.clear(); 1160 } 1161 1162 // Now dispatch down to our children, caching the responses 1163 mChildAcceptsDrag = false; 1164 final int count = mChildrenCount; 1165 final View[] children = mChildren; 1166 for (int i = 0; i < count; i++) { 1167 final View child = children[i]; 1168 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1169 if (child.getVisibility() == VISIBLE) { 1170 final boolean handled = notifyChildOfDrag(children[i]); 1171 if (handled) { 1172 mChildAcceptsDrag = true; 1173 } 1174 } 1175 } 1176 1177 // Return HANDLED if one of our children can accept the drag 1178 if (mChildAcceptsDrag) { 1179 retval = true; 1180 } 1181 } break; 1182 1183 case DragEvent.ACTION_DRAG_ENDED: { 1184 // Release the bookkeeping now that the drag lifecycle has ended 1185 if (mDragNotifiedChildren != null) { 1186 for (View child : mDragNotifiedChildren) { 1187 // If a child was notified about an ongoing drag, it's told that it's over 1188 child.dispatchDragEvent(event); 1189 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1190 child.refreshDrawableState(); 1191 } 1192 1193 mDragNotifiedChildren.clear(); 1194 if (mCurrentDrag != null) { 1195 mCurrentDrag.recycle(); 1196 mCurrentDrag = null; 1197 } 1198 } 1199 1200 // We consider drag-ended to have been handled if one of our children 1201 // had offered to handle the drag. 1202 if (mChildAcceptsDrag) { 1203 retval = true; 1204 } 1205 } break; 1206 1207 case DragEvent.ACTION_DRAG_LOCATION: { 1208 // Find the [possibly new] drag target 1209 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1210 1211 // If we've changed apparent drag target, tell the view root which view 1212 // we're over now [for purposes of the eventual drag-recipient-changed 1213 // notifications to the framework] and tell the new target that the drag 1214 // has entered its bounds. The root will see setDragFocus() calls all 1215 // the way down to the final leaf view that is handling the LOCATION event 1216 // before reporting the new potential recipient to the framework. 1217 if (mCurrentDragView != target) { 1218 root.setDragFocus(target); 1219 1220 final int action = event.mAction; 1221 // If we've dragged off of a child view, send it the EXITED message 1222 if (mCurrentDragView != null) { 1223 final View view = mCurrentDragView; 1224 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1225 view.dispatchDragEvent(event); 1226 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1227 view.refreshDrawableState(); 1228 } 1229 mCurrentDragView = target; 1230 1231 // If we've dragged over a new child view, send it the ENTERED message 1232 if (target != null) { 1233 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1234 target.dispatchDragEvent(event); 1235 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1236 target.refreshDrawableState(); 1237 } 1238 event.mAction = action; // restore the event's original state 1239 } 1240 1241 // Dispatch the actual drag location notice, localized into its coordinates 1242 if (target != null) { 1243 event.mX = localPoint.x; 1244 event.mY = localPoint.y; 1245 1246 retval = target.dispatchDragEvent(event); 1247 1248 event.mX = tx; 1249 event.mY = ty; 1250 } 1251 } break; 1252 1253 /* Entered / exited dispatch 1254 * 1255 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1256 * that we're about to get the corresponding LOCATION event, which we will use to 1257 * determine which of our children is the new target; at that point we will 1258 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1259 * 1260 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1261 * drag has left this ViewGroup, we know by definition that every contained subview 1262 * is also no longer under the drag point. 1263 */ 1264 1265 case DragEvent.ACTION_DRAG_EXITED: { 1266 if (mCurrentDragView != null) { 1267 final View view = mCurrentDragView; 1268 view.dispatchDragEvent(event); 1269 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1270 view.refreshDrawableState(); 1271 1272 mCurrentDragView = null; 1273 } 1274 } break; 1275 1276 case DragEvent.ACTION_DROP: { 1277 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1278 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1279 if (target != null) { 1280 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1281 event.mX = localPoint.x; 1282 event.mY = localPoint.y; 1283 retval = target.dispatchDragEvent(event); 1284 event.mX = tx; 1285 event.mY = ty; 1286 } else { 1287 if (ViewDebug.DEBUG_DRAG) { 1288 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1289 } 1290 } 1291 } break; 1292 } 1293 1294 // If none of our children could handle the event, try here 1295 if (!retval) { 1296 // Call up to the View implementation that dispatches to installed listeners 1297 retval = super.dispatchDragEvent(event); 1298 } 1299 return retval; 1300 } 1301 1302 // Find the frontmost child view that lies under the given point, and calculate 1303 // the position within its own local coordinate system. 1304 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1305 final int count = mChildrenCount; 1306 final View[] children = mChildren; 1307 for (int i = count - 1; i >= 0; i--) { 1308 final View child = children[i]; 1309 if (!child.canAcceptDrag()) { 1310 continue; 1311 } 1312 1313 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1314 return child; 1315 } 1316 } 1317 return null; 1318 } 1319 1320 boolean notifyChildOfDrag(View child) { 1321 if (ViewDebug.DEBUG_DRAG) { 1322 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1323 } 1324 1325 boolean canAccept = false; 1326 if (! mDragNotifiedChildren.contains(child)) { 1327 mDragNotifiedChildren.add(child); 1328 canAccept = child.dispatchDragEvent(mCurrentDrag); 1329 if (canAccept && !child.canAcceptDrag()) { 1330 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1331 child.refreshDrawableState(); 1332 } 1333 } 1334 return canAccept; 1335 } 1336 1337 @Override 1338 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1339 super.dispatchWindowSystemUiVisiblityChanged(visible); 1340 1341 final int count = mChildrenCount; 1342 final View[] children = mChildren; 1343 for (int i=0; i <count; i++) { 1344 final View child = children[i]; 1345 child.dispatchWindowSystemUiVisiblityChanged(visible); 1346 } 1347 } 1348 1349 @Override 1350 public void dispatchSystemUiVisibilityChanged(int visible) { 1351 super.dispatchSystemUiVisibilityChanged(visible); 1352 1353 final int count = mChildrenCount; 1354 final View[] children = mChildren; 1355 for (int i=0; i <count; i++) { 1356 final View child = children[i]; 1357 child.dispatchSystemUiVisibilityChanged(visible); 1358 } 1359 } 1360 1361 @Override 1362 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1363 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1364 1365 final int count = mChildrenCount; 1366 final View[] children = mChildren; 1367 for (int i=0; i <count; i++) { 1368 final View child = children[i]; 1369 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1370 } 1371 return changed; 1372 } 1373 1374 /** 1375 * {@inheritDoc} 1376 */ 1377 @Override 1378 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1379 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1380 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1381 return super.dispatchKeyEventPreIme(event); 1382 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1383 == PFLAG_HAS_BOUNDS) { 1384 return mFocused.dispatchKeyEventPreIme(event); 1385 } 1386 return false; 1387 } 1388 1389 /** 1390 * {@inheritDoc} 1391 */ 1392 @Override 1393 public boolean dispatchKeyEvent(KeyEvent event) { 1394 if (mInputEventConsistencyVerifier != null) { 1395 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1396 } 1397 1398 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1399 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1400 if (super.dispatchKeyEvent(event)) { 1401 return true; 1402 } 1403 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1404 == PFLAG_HAS_BOUNDS) { 1405 if (mFocused.dispatchKeyEvent(event)) { 1406 return true; 1407 } 1408 } 1409 1410 if (mInputEventConsistencyVerifier != null) { 1411 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1412 } 1413 return false; 1414 } 1415 1416 /** 1417 * {@inheritDoc} 1418 */ 1419 @Override 1420 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1421 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1422 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1423 return super.dispatchKeyShortcutEvent(event); 1424 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1425 == PFLAG_HAS_BOUNDS) { 1426 return mFocused.dispatchKeyShortcutEvent(event); 1427 } 1428 return false; 1429 } 1430 1431 /** 1432 * {@inheritDoc} 1433 */ 1434 @Override 1435 public boolean dispatchTrackballEvent(MotionEvent event) { 1436 if (mInputEventConsistencyVerifier != null) { 1437 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1438 } 1439 1440 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1441 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1442 if (super.dispatchTrackballEvent(event)) { 1443 return true; 1444 } 1445 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1446 == PFLAG_HAS_BOUNDS) { 1447 if (mFocused.dispatchTrackballEvent(event)) { 1448 return true; 1449 } 1450 } 1451 1452 if (mInputEventConsistencyVerifier != null) { 1453 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1454 } 1455 return false; 1456 } 1457 1458 /** 1459 * {@inheritDoc} 1460 */ 1461 @SuppressWarnings({"ConstantConditions"}) 1462 @Override 1463 protected boolean dispatchHoverEvent(MotionEvent event) { 1464 final int action = event.getAction(); 1465 1466 // First check whether the view group wants to intercept the hover event. 1467 final boolean interceptHover = onInterceptHoverEvent(event); 1468 event.setAction(action); // restore action in case it was changed 1469 1470 MotionEvent eventNoHistory = event; 1471 boolean handled = false; 1472 1473 // Send events to the hovered children and build a new list of hover targets until 1474 // one is found that handles the event. 1475 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1476 mFirstHoverTarget = null; 1477 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1478 final float x = event.getX(); 1479 final float y = event.getY(); 1480 final int childrenCount = mChildrenCount; 1481 if (childrenCount != 0) { 1482 final boolean customChildOrder = isChildrenDrawingOrderEnabled(); 1483 final View[] children = mChildren; 1484 HoverTarget lastHoverTarget = null; 1485 for (int i = childrenCount - 1; i >= 0; i--) { 1486 final int childIndex = customChildOrder 1487 ? getChildDrawingOrder(childrenCount, i) : i; 1488 final View child = children[childIndex]; 1489 if (!canViewReceivePointerEvents(child) 1490 || !isTransformedTouchPointInView(x, y, child, null)) { 1491 continue; 1492 } 1493 1494 // Obtain a hover target for this child. Dequeue it from the 1495 // old hover target list if the child was previously hovered. 1496 HoverTarget hoverTarget = firstOldHoverTarget; 1497 final boolean wasHovered; 1498 for (HoverTarget predecessor = null; ;) { 1499 if (hoverTarget == null) { 1500 hoverTarget = HoverTarget.obtain(child); 1501 wasHovered = false; 1502 break; 1503 } 1504 1505 if (hoverTarget.child == child) { 1506 if (predecessor != null) { 1507 predecessor.next = hoverTarget.next; 1508 } else { 1509 firstOldHoverTarget = hoverTarget.next; 1510 } 1511 hoverTarget.next = null; 1512 wasHovered = true; 1513 break; 1514 } 1515 1516 predecessor = hoverTarget; 1517 hoverTarget = hoverTarget.next; 1518 } 1519 1520 // Enqueue the hover target onto the new hover target list. 1521 if (lastHoverTarget != null) { 1522 lastHoverTarget.next = hoverTarget; 1523 } else { 1524 mFirstHoverTarget = hoverTarget; 1525 } 1526 lastHoverTarget = hoverTarget; 1527 1528 // Dispatch the event to the child. 1529 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1530 if (!wasHovered) { 1531 // Send the enter as is. 1532 handled |= dispatchTransformedGenericPointerEvent( 1533 event, child); // enter 1534 } 1535 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1536 if (!wasHovered) { 1537 // Synthesize an enter from a move. 1538 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1539 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1540 handled |= dispatchTransformedGenericPointerEvent( 1541 eventNoHistory, child); // enter 1542 eventNoHistory.setAction(action); 1543 1544 handled |= dispatchTransformedGenericPointerEvent( 1545 eventNoHistory, child); // move 1546 } else { 1547 // Send the move as is. 1548 handled |= dispatchTransformedGenericPointerEvent(event, child); 1549 } 1550 } 1551 if (handled) { 1552 break; 1553 } 1554 } 1555 } 1556 } 1557 1558 // Send exit events to all previously hovered children that are no longer hovered. 1559 while (firstOldHoverTarget != null) { 1560 final View child = firstOldHoverTarget.child; 1561 1562 // Exit the old hovered child. 1563 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1564 // Send the exit as is. 1565 handled |= dispatchTransformedGenericPointerEvent( 1566 event, child); // exit 1567 } else { 1568 // Synthesize an exit from a move or enter. 1569 // Ignore the result because hover focus has moved to a different view. 1570 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1571 dispatchTransformedGenericPointerEvent( 1572 event, child); // move 1573 } 1574 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1575 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1576 dispatchTransformedGenericPointerEvent( 1577 eventNoHistory, child); // exit 1578 eventNoHistory.setAction(action); 1579 } 1580 1581 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1582 firstOldHoverTarget.recycle(); 1583 firstOldHoverTarget = nextOldHoverTarget; 1584 } 1585 1586 // Send events to the view group itself if no children have handled it. 1587 boolean newHoveredSelf = !handled; 1588 if (newHoveredSelf == mHoveredSelf) { 1589 if (newHoveredSelf) { 1590 // Send event to the view group as before. 1591 handled |= super.dispatchHoverEvent(event); 1592 } 1593 } else { 1594 if (mHoveredSelf) { 1595 // Exit the view group. 1596 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1597 // Send the exit as is. 1598 handled |= super.dispatchHoverEvent(event); // exit 1599 } else { 1600 // Synthesize an exit from a move or enter. 1601 // Ignore the result because hover focus is moving to a different view. 1602 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1603 super.dispatchHoverEvent(event); // move 1604 } 1605 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1606 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1607 super.dispatchHoverEvent(eventNoHistory); // exit 1608 eventNoHistory.setAction(action); 1609 } 1610 mHoveredSelf = false; 1611 } 1612 1613 if (newHoveredSelf) { 1614 // Enter the view group. 1615 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1616 // Send the enter as is. 1617 handled |= super.dispatchHoverEvent(event); // enter 1618 mHoveredSelf = true; 1619 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1620 // Synthesize an enter from a move. 1621 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1622 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1623 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1624 eventNoHistory.setAction(action); 1625 1626 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1627 mHoveredSelf = true; 1628 } 1629 } 1630 } 1631 1632 // Recycle the copy of the event that we made. 1633 if (eventNoHistory != event) { 1634 eventNoHistory.recycle(); 1635 } 1636 1637 // Done. 1638 return handled; 1639 } 1640 1641 private void exitHoverTargets() { 1642 if (mHoveredSelf || mFirstHoverTarget != null) { 1643 final long now = SystemClock.uptimeMillis(); 1644 MotionEvent event = MotionEvent.obtain(now, now, 1645 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1646 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1647 dispatchHoverEvent(event); 1648 event.recycle(); 1649 } 1650 } 1651 1652 private void cancelHoverTarget(View view) { 1653 HoverTarget predecessor = null; 1654 HoverTarget target = mFirstHoverTarget; 1655 while (target != null) { 1656 final HoverTarget next = target.next; 1657 if (target.child == view) { 1658 if (predecessor == null) { 1659 mFirstHoverTarget = next; 1660 } else { 1661 predecessor.next = next; 1662 } 1663 target.recycle(); 1664 1665 final long now = SystemClock.uptimeMillis(); 1666 MotionEvent event = MotionEvent.obtain(now, now, 1667 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1668 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1669 view.dispatchHoverEvent(event); 1670 event.recycle(); 1671 return; 1672 } 1673 predecessor = target; 1674 target = next; 1675 } 1676 } 1677 1678 /** @hide */ 1679 @Override 1680 protected boolean hasHoveredChild() { 1681 return mFirstHoverTarget != null; 1682 } 1683 1684 @Override 1685 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1686 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1687 try { 1688 final int childrenCount = children.getChildCount(); 1689 for (int i = 0; i < childrenCount; i++) { 1690 View child = children.getChildAt(i); 1691 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1692 if (child.includeForAccessibility()) { 1693 childrenForAccessibility.add(child); 1694 } else { 1695 child.addChildrenForAccessibility(childrenForAccessibility); 1696 } 1697 } 1698 } 1699 } finally { 1700 children.recycle(); 1701 } 1702 } 1703 1704 /** 1705 * Implement this method to intercept hover events before they are handled 1706 * by child views. 1707 * <p> 1708 * This method is called before dispatching a hover event to a child of 1709 * the view group or to the view group's own {@link #onHoverEvent} to allow 1710 * the view group a chance to intercept the hover event. 1711 * This method can also be used to watch all pointer motions that occur within 1712 * the bounds of the view group even when the pointer is hovering over 1713 * a child of the view group rather than over the view group itself. 1714 * </p><p> 1715 * The view group can prevent its children from receiving hover events by 1716 * implementing this method and returning <code>true</code> to indicate 1717 * that it would like to intercept hover events. The view group must 1718 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1719 * for as long as it wishes to continue intercepting hover events from 1720 * its children. 1721 * </p><p> 1722 * Interception preserves the invariant that at most one view can be 1723 * hovered at a time by transferring hover focus from the currently hovered 1724 * child to the view group or vice-versa as needed. 1725 * </p><p> 1726 * If this method returns <code>true</code> and a child is already hovered, then the 1727 * child view will first receive a hover exit event and then the view group 1728 * itself will receive a hover enter event in {@link #onHoverEvent}. 1729 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1730 * events and instead returns <code>false</code> while the pointer is hovering 1731 * within the bounds of one of a child, then the view group will first receive a 1732 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1733 * receive a hover enter event. 1734 * </p><p> 1735 * The default implementation always returns false. 1736 * </p> 1737 * 1738 * @param event The motion event that describes the hover. 1739 * @return True if the view group would like to intercept the hover event 1740 * and prevent its children from receiving it. 1741 */ 1742 public boolean onInterceptHoverEvent(MotionEvent event) { 1743 return false; 1744 } 1745 1746 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1747 if (event.getHistorySize() == 0) { 1748 return event; 1749 } 1750 return MotionEvent.obtainNoHistory(event); 1751 } 1752 1753 /** 1754 * {@inheritDoc} 1755 */ 1756 @Override 1757 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1758 // Send the event to the child under the pointer. 1759 final int childrenCount = mChildrenCount; 1760 if (childrenCount != 0) { 1761 final View[] children = mChildren; 1762 final float x = event.getX(); 1763 final float y = event.getY(); 1764 1765 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1766 for (int i = childrenCount - 1; i >= 0; i--) { 1767 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1768 final View child = children[childIndex]; 1769 if (!canViewReceivePointerEvents(child) 1770 || !isTransformedTouchPointInView(x, y, child, null)) { 1771 continue; 1772 } 1773 1774 if (dispatchTransformedGenericPointerEvent(event, child)) { 1775 return true; 1776 } 1777 } 1778 } 1779 1780 // No child handled the event. Send it to this view group. 1781 return super.dispatchGenericPointerEvent(event); 1782 } 1783 1784 /** 1785 * {@inheritDoc} 1786 */ 1787 @Override 1788 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1789 // Send the event to the focused child or to this view group if it has focus. 1790 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1791 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1792 return super.dispatchGenericFocusedEvent(event); 1793 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1794 == PFLAG_HAS_BOUNDS) { 1795 return mFocused.dispatchGenericMotionEvent(event); 1796 } 1797 return false; 1798 } 1799 1800 /** 1801 * Dispatches a generic pointer event to a child, taking into account 1802 * transformations that apply to the child. 1803 * 1804 * @param event The event to send. 1805 * @param child The view to send the event to. 1806 * @return {@code true} if the child handled the event. 1807 */ 1808 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1809 final float offsetX = mScrollX - child.mLeft; 1810 final float offsetY = mScrollY - child.mTop; 1811 1812 boolean handled; 1813 if (!child.hasIdentityMatrix()) { 1814 MotionEvent transformedEvent = MotionEvent.obtain(event); 1815 transformedEvent.offsetLocation(offsetX, offsetY); 1816 transformedEvent.transform(child.getInverseMatrix()); 1817 handled = child.dispatchGenericMotionEvent(transformedEvent); 1818 transformedEvent.recycle(); 1819 } else { 1820 event.offsetLocation(offsetX, offsetY); 1821 handled = child.dispatchGenericMotionEvent(event); 1822 event.offsetLocation(-offsetX, -offsetY); 1823 } 1824 return handled; 1825 } 1826 1827 /** 1828 * {@inheritDoc} 1829 */ 1830 @Override 1831 public boolean dispatchTouchEvent(MotionEvent ev) { 1832 if (mInputEventConsistencyVerifier != null) { 1833 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1834 } 1835 1836 boolean handled = false; 1837 if (onFilterTouchEventForSecurity(ev)) { 1838 final int action = ev.getAction(); 1839 final int actionMasked = action & MotionEvent.ACTION_MASK; 1840 1841 // Handle an initial down. 1842 if (actionMasked == MotionEvent.ACTION_DOWN) { 1843 // Throw away all previous state when starting a new touch gesture. 1844 // The framework may have dropped the up or cancel event for the previous gesture 1845 // due to an app switch, ANR, or some other state change. 1846 cancelAndClearTouchTargets(ev); 1847 resetTouchState(); 1848 } 1849 1850 // Check for interception. 1851 final boolean intercepted; 1852 if (actionMasked == MotionEvent.ACTION_DOWN 1853 || mFirstTouchTarget != null) { 1854 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1855 if (!disallowIntercept) { 1856 intercepted = onInterceptTouchEvent(ev); 1857 ev.setAction(action); // restore action in case it was changed 1858 } else { 1859 intercepted = false; 1860 } 1861 } else { 1862 // There are no touch targets and this action is not an initial down 1863 // so this view group continues to intercept touches. 1864 intercepted = true; 1865 } 1866 1867 // Check for cancelation. 1868 final boolean canceled = resetCancelNextUpFlag(this) 1869 || actionMasked == MotionEvent.ACTION_CANCEL; 1870 1871 // Update list of touch targets for pointer down, if needed. 1872 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1873 TouchTarget newTouchTarget = null; 1874 boolean alreadyDispatchedToNewTouchTarget = false; 1875 if (!canceled && !intercepted) { 1876 if (actionMasked == MotionEvent.ACTION_DOWN 1877 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1878 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1879 final int actionIndex = ev.getActionIndex(); // always 0 for down 1880 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1881 : TouchTarget.ALL_POINTER_IDS; 1882 1883 // Clean up earlier touch targets for this pointer id in case they 1884 // have become out of sync. 1885 removePointersFromTouchTargets(idBitsToAssign); 1886 1887 final int childrenCount = mChildrenCount; 1888 if (newTouchTarget == null && childrenCount != 0) { 1889 final float x = ev.getX(actionIndex); 1890 final float y = ev.getY(actionIndex); 1891 // Find a child that can receive the event. 1892 // Scan children from front to back. 1893 final View[] children = mChildren; 1894 1895 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1896 for (int i = childrenCount - 1; i >= 0; i--) { 1897 final int childIndex = customOrder ? 1898 getChildDrawingOrder(childrenCount, i) : i; 1899 final View child = children[childIndex]; 1900 if (!canViewReceivePointerEvents(child) 1901 || !isTransformedTouchPointInView(x, y, child, null)) { 1902 continue; 1903 } 1904 1905 newTouchTarget = getTouchTarget(child); 1906 if (newTouchTarget != null) { 1907 // Child is already receiving touch within its bounds. 1908 // Give it the new pointer in addition to the ones it is handling. 1909 newTouchTarget.pointerIdBits |= idBitsToAssign; 1910 break; 1911 } 1912 1913 resetCancelNextUpFlag(child); 1914 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1915 // Child wants to receive touch within its bounds. 1916 mLastTouchDownTime = ev.getDownTime(); 1917 mLastTouchDownIndex = childIndex; 1918 mLastTouchDownX = ev.getX(); 1919 mLastTouchDownY = ev.getY(); 1920 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1921 alreadyDispatchedToNewTouchTarget = true; 1922 break; 1923 } 1924 } 1925 } 1926 1927 if (newTouchTarget == null && mFirstTouchTarget != null) { 1928 // Did not find a child to receive the event. 1929 // Assign the pointer to the least recently added target. 1930 newTouchTarget = mFirstTouchTarget; 1931 while (newTouchTarget.next != null) { 1932 newTouchTarget = newTouchTarget.next; 1933 } 1934 newTouchTarget.pointerIdBits |= idBitsToAssign; 1935 } 1936 } 1937 } 1938 1939 // Dispatch to touch targets. 1940 if (mFirstTouchTarget == null) { 1941 // No touch targets so treat this as an ordinary view. 1942 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1943 TouchTarget.ALL_POINTER_IDS); 1944 } else { 1945 // Dispatch to touch targets, excluding the new touch target if we already 1946 // dispatched to it. Cancel touch targets if necessary. 1947 TouchTarget predecessor = null; 1948 TouchTarget target = mFirstTouchTarget; 1949 while (target != null) { 1950 final TouchTarget next = target.next; 1951 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1952 handled = true; 1953 } else { 1954 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1955 || intercepted; 1956 if (dispatchTransformedTouchEvent(ev, cancelChild, 1957 target.child, target.pointerIdBits)) { 1958 handled = true; 1959 } 1960 if (cancelChild) { 1961 if (predecessor == null) { 1962 mFirstTouchTarget = next; 1963 } else { 1964 predecessor.next = next; 1965 } 1966 target.recycle(); 1967 target = next; 1968 continue; 1969 } 1970 } 1971 predecessor = target; 1972 target = next; 1973 } 1974 } 1975 1976 // Update list of touch targets for pointer up or cancel, if needed. 1977 if (canceled 1978 || actionMasked == MotionEvent.ACTION_UP 1979 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1980 resetTouchState(); 1981 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1982 final int actionIndex = ev.getActionIndex(); 1983 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1984 removePointersFromTouchTargets(idBitsToRemove); 1985 } 1986 } 1987 1988 if (!handled && mInputEventConsistencyVerifier != null) { 1989 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1990 } 1991 return handled; 1992 } 1993 1994 /** 1995 * Resets all touch state in preparation for a new cycle. 1996 */ 1997 private void resetTouchState() { 1998 clearTouchTargets(); 1999 resetCancelNextUpFlag(this); 2000 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2001 } 2002 2003 /** 2004 * Resets the cancel next up flag. 2005 * Returns true if the flag was previously set. 2006 */ 2007 private static boolean resetCancelNextUpFlag(View view) { 2008 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2009 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2010 return true; 2011 } 2012 return false; 2013 } 2014 2015 /** 2016 * Clears all touch targets. 2017 */ 2018 private void clearTouchTargets() { 2019 TouchTarget target = mFirstTouchTarget; 2020 if (target != null) { 2021 do { 2022 TouchTarget next = target.next; 2023 target.recycle(); 2024 target = next; 2025 } while (target != null); 2026 mFirstTouchTarget = null; 2027 } 2028 } 2029 2030 /** 2031 * Cancels and clears all touch targets. 2032 */ 2033 private void cancelAndClearTouchTargets(MotionEvent event) { 2034 if (mFirstTouchTarget != null) { 2035 boolean syntheticEvent = false; 2036 if (event == null) { 2037 final long now = SystemClock.uptimeMillis(); 2038 event = MotionEvent.obtain(now, now, 2039 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2040 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2041 syntheticEvent = true; 2042 } 2043 2044 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2045 resetCancelNextUpFlag(target.child); 2046 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2047 } 2048 clearTouchTargets(); 2049 2050 if (syntheticEvent) { 2051 event.recycle(); 2052 } 2053 } 2054 } 2055 2056 /** 2057 * Gets the touch target for specified child view. 2058 * Returns null if not found. 2059 */ 2060 private TouchTarget getTouchTarget(View child) { 2061 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2062 if (target.child == child) { 2063 return target; 2064 } 2065 } 2066 return null; 2067 } 2068 2069 /** 2070 * Adds a touch target for specified child to the beginning of the list. 2071 * Assumes the target child is not already present. 2072 */ 2073 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2074 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2075 target.next = mFirstTouchTarget; 2076 mFirstTouchTarget = target; 2077 return target; 2078 } 2079 2080 /** 2081 * Removes the pointer ids from consideration. 2082 */ 2083 private void removePointersFromTouchTargets(int pointerIdBits) { 2084 TouchTarget predecessor = null; 2085 TouchTarget target = mFirstTouchTarget; 2086 while (target != null) { 2087 final TouchTarget next = target.next; 2088 if ((target.pointerIdBits & pointerIdBits) != 0) { 2089 target.pointerIdBits &= ~pointerIdBits; 2090 if (target.pointerIdBits == 0) { 2091 if (predecessor == null) { 2092 mFirstTouchTarget = next; 2093 } else { 2094 predecessor.next = next; 2095 } 2096 target.recycle(); 2097 target = next; 2098 continue; 2099 } 2100 } 2101 predecessor = target; 2102 target = next; 2103 } 2104 } 2105 2106 private void cancelTouchTarget(View view) { 2107 TouchTarget predecessor = null; 2108 TouchTarget target = mFirstTouchTarget; 2109 while (target != null) { 2110 final TouchTarget next = target.next; 2111 if (target.child == view) { 2112 if (predecessor == null) { 2113 mFirstTouchTarget = next; 2114 } else { 2115 predecessor.next = next; 2116 } 2117 target.recycle(); 2118 2119 final long now = SystemClock.uptimeMillis(); 2120 MotionEvent event = MotionEvent.obtain(now, now, 2121 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2122 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2123 view.dispatchTouchEvent(event); 2124 event.recycle(); 2125 return; 2126 } 2127 predecessor = target; 2128 target = next; 2129 } 2130 } 2131 2132 /** 2133 * Returns true if a child view can receive pointer events. 2134 * @hide 2135 */ 2136 private static boolean canViewReceivePointerEvents(View child) { 2137 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2138 || child.getAnimation() != null; 2139 } 2140 2141 /** 2142 * Returns true if a child view contains the specified point when transformed 2143 * into its coordinate space. 2144 * Child must not be null. 2145 * @hide 2146 */ 2147 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2148 PointF outLocalPoint) { 2149 float localX = x + mScrollX - child.mLeft; 2150 float localY = y + mScrollY - child.mTop; 2151 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2152 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2153 localXY[0] = localX; 2154 localXY[1] = localY; 2155 child.getInverseMatrix().mapPoints(localXY); 2156 localX = localXY[0]; 2157 localY = localXY[1]; 2158 } 2159 final boolean isInView = child.pointInView(localX, localY); 2160 if (isInView && outLocalPoint != null) { 2161 outLocalPoint.set(localX, localY); 2162 } 2163 return isInView; 2164 } 2165 2166 /** 2167 * Transforms a motion event into the coordinate space of a particular child view, 2168 * filters out irrelevant pointer ids, and overrides its action if necessary. 2169 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2170 */ 2171 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2172 View child, int desiredPointerIdBits) { 2173 final boolean handled; 2174 2175 // Canceling motions is a special case. We don't need to perform any transformations 2176 // or filtering. The important part is the action, not the contents. 2177 final int oldAction = event.getAction(); 2178 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2179 event.setAction(MotionEvent.ACTION_CANCEL); 2180 if (child == null) { 2181 handled = super.dispatchTouchEvent(event); 2182 } else { 2183 handled = child.dispatchTouchEvent(event); 2184 } 2185 event.setAction(oldAction); 2186 return handled; 2187 } 2188 2189 // Calculate the number of pointers to deliver. 2190 final int oldPointerIdBits = event.getPointerIdBits(); 2191 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2192 2193 // If for some reason we ended up in an inconsistent state where it looks like we 2194 // might produce a motion event with no pointers in it, then drop the event. 2195 if (newPointerIdBits == 0) { 2196 return false; 2197 } 2198 2199 // If the number of pointers is the same and we don't need to perform any fancy 2200 // irreversible transformations, then we can reuse the motion event for this 2201 // dispatch as long as we are careful to revert any changes we make. 2202 // Otherwise we need to make a copy. 2203 final MotionEvent transformedEvent; 2204 if (newPointerIdBits == oldPointerIdBits) { 2205 if (child == null || child.hasIdentityMatrix()) { 2206 if (child == null) { 2207 handled = super.dispatchTouchEvent(event); 2208 } else { 2209 final float offsetX = mScrollX - child.mLeft; 2210 final float offsetY = mScrollY - child.mTop; 2211 event.offsetLocation(offsetX, offsetY); 2212 2213 handled = child.dispatchTouchEvent(event); 2214 2215 event.offsetLocation(-offsetX, -offsetY); 2216 } 2217 return handled; 2218 } 2219 transformedEvent = MotionEvent.obtain(event); 2220 } else { 2221 transformedEvent = event.split(newPointerIdBits); 2222 } 2223 2224 // Perform any necessary transformations and dispatch. 2225 if (child == null) { 2226 handled = super.dispatchTouchEvent(transformedEvent); 2227 } else { 2228 final float offsetX = mScrollX - child.mLeft; 2229 final float offsetY = mScrollY - child.mTop; 2230 transformedEvent.offsetLocation(offsetX, offsetY); 2231 if (! child.hasIdentityMatrix()) { 2232 transformedEvent.transform(child.getInverseMatrix()); 2233 } 2234 2235 handled = child.dispatchTouchEvent(transformedEvent); 2236 } 2237 2238 // Done. 2239 transformedEvent.recycle(); 2240 return handled; 2241 } 2242 2243 /** 2244 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2245 * dispatch. This behavior is enabled by default for applications that target an 2246 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2247 * 2248 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2249 * views depending on where each pointer initially went down. This allows for user interactions 2250 * such as scrolling two panes of content independently, chording of buttons, and performing 2251 * independent gestures on different pieces of content. 2252 * 2253 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2254 * child views. <code>false</code> to only allow one child view to be the target of 2255 * any MotionEvent received by this ViewGroup. 2256 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2257 */ 2258 public void setMotionEventSplittingEnabled(boolean split) { 2259 // TODO Applications really shouldn't change this setting mid-touch event, 2260 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2261 // with gestures in progress when this is changed. 2262 if (split) { 2263 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2264 } else { 2265 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2266 } 2267 } 2268 2269 /** 2270 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2271 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2272 */ 2273 public boolean isMotionEventSplittingEnabled() { 2274 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2275 } 2276 2277 /** 2278 * {@inheritDoc} 2279 */ 2280 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2281 2282 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2283 // We're already in this state, assume our ancestors are too 2284 return; 2285 } 2286 2287 if (disallowIntercept) { 2288 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2289 } else { 2290 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2291 } 2292 2293 // Pass it up to our parent 2294 if (mParent != null) { 2295 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2296 } 2297 } 2298 2299 /** 2300 * Implement this method to intercept all touch screen motion events. This 2301 * allows you to watch events as they are dispatched to your children, and 2302 * take ownership of the current gesture at any point. 2303 * 2304 * <p>Using this function takes some care, as it has a fairly complicated 2305 * interaction with {@link View#onTouchEvent(MotionEvent) 2306 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2307 * that method as well as this one in the correct way. Events will be 2308 * received in the following order: 2309 * 2310 * <ol> 2311 * <li> You will receive the down event here. 2312 * <li> The down event will be handled either by a child of this view 2313 * group, or given to your own onTouchEvent() method to handle; this means 2314 * you should implement onTouchEvent() to return true, so you will 2315 * continue to see the rest of the gesture (instead of looking for 2316 * a parent view to handle it). Also, by returning true from 2317 * onTouchEvent(), you will not receive any following 2318 * events in onInterceptTouchEvent() and all touch processing must 2319 * happen in onTouchEvent() like normal. 2320 * <li> For as long as you return false from this function, each following 2321 * event (up to and including the final up) will be delivered first here 2322 * and then to the target's onTouchEvent(). 2323 * <li> If you return true from here, you will not receive any 2324 * following events: the target view will receive the same event but 2325 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2326 * events will be delivered to your onTouchEvent() method and no longer 2327 * appear here. 2328 * </ol> 2329 * 2330 * @param ev The motion event being dispatched down the hierarchy. 2331 * @return Return true to steal motion events from the children and have 2332 * them dispatched to this ViewGroup through onTouchEvent(). 2333 * The current target will receive an ACTION_CANCEL event, and no further 2334 * messages will be delivered here. 2335 */ 2336 public boolean onInterceptTouchEvent(MotionEvent ev) { 2337 return false; 2338 } 2339 2340 /** 2341 * {@inheritDoc} 2342 * 2343 * Looks for a view to give focus to respecting the setting specified by 2344 * {@link #getDescendantFocusability()}. 2345 * 2346 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2347 * find focus within the children of this group when appropriate. 2348 * 2349 * @see #FOCUS_BEFORE_DESCENDANTS 2350 * @see #FOCUS_AFTER_DESCENDANTS 2351 * @see #FOCUS_BLOCK_DESCENDANTS 2352 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2353 */ 2354 @Override 2355 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2356 if (DBG) { 2357 System.out.println(this + " ViewGroup.requestFocus direction=" 2358 + direction); 2359 } 2360 int descendantFocusability = getDescendantFocusability(); 2361 2362 switch (descendantFocusability) { 2363 case FOCUS_BLOCK_DESCENDANTS: 2364 return super.requestFocus(direction, previouslyFocusedRect); 2365 case FOCUS_BEFORE_DESCENDANTS: { 2366 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2367 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2368 } 2369 case FOCUS_AFTER_DESCENDANTS: { 2370 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2371 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2372 } 2373 default: 2374 throw new IllegalStateException("descendant focusability must be " 2375 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2376 + "but is " + descendantFocusability); 2377 } 2378 } 2379 2380 /** 2381 * Look for a descendant to call {@link View#requestFocus} on. 2382 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2383 * when it wants to request focus within its children. Override this to 2384 * customize how your {@link ViewGroup} requests focus within its children. 2385 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2386 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2387 * to give a finer grained hint about where focus is coming from. May be null 2388 * if there is no hint. 2389 * @return Whether focus was taken. 2390 */ 2391 @SuppressWarnings({"ConstantConditions"}) 2392 protected boolean onRequestFocusInDescendants(int direction, 2393 Rect previouslyFocusedRect) { 2394 int index; 2395 int increment; 2396 int end; 2397 int count = mChildrenCount; 2398 if ((direction & FOCUS_FORWARD) != 0) { 2399 index = 0; 2400 increment = 1; 2401 end = count; 2402 } else { 2403 index = count - 1; 2404 increment = -1; 2405 end = -1; 2406 } 2407 final View[] children = mChildren; 2408 for (int i = index; i != end; i += increment) { 2409 View child = children[i]; 2410 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2411 if (child.requestFocus(direction, previouslyFocusedRect)) { 2412 return true; 2413 } 2414 } 2415 } 2416 return false; 2417 } 2418 2419 /** 2420 * {@inheritDoc} 2421 * 2422 * @hide 2423 */ 2424 @Override 2425 public void dispatchStartTemporaryDetach() { 2426 super.dispatchStartTemporaryDetach(); 2427 final int count = mChildrenCount; 2428 final View[] children = mChildren; 2429 for (int i = 0; i < count; i++) { 2430 children[i].dispatchStartTemporaryDetach(); 2431 } 2432 } 2433 2434 /** 2435 * {@inheritDoc} 2436 * 2437 * @hide 2438 */ 2439 @Override 2440 public void dispatchFinishTemporaryDetach() { 2441 super.dispatchFinishTemporaryDetach(); 2442 final int count = mChildrenCount; 2443 final View[] children = mChildren; 2444 for (int i = 0; i < count; i++) { 2445 children[i].dispatchFinishTemporaryDetach(); 2446 } 2447 } 2448 2449 /** 2450 * {@inheritDoc} 2451 */ 2452 @Override 2453 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2454 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2455 super.dispatchAttachedToWindow(info, visibility); 2456 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2457 2458 final int count = mChildrenCount; 2459 final View[] children = mChildren; 2460 for (int i = 0; i < count; i++) { 2461 final View child = children[i]; 2462 child.dispatchAttachedToWindow(info, 2463 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2464 } 2465 } 2466 2467 @Override 2468 void dispatchScreenStateChanged(int screenState) { 2469 super.dispatchScreenStateChanged(screenState); 2470 2471 final int count = mChildrenCount; 2472 final View[] children = mChildren; 2473 for (int i = 0; i < count; i++) { 2474 children[i].dispatchScreenStateChanged(screenState); 2475 } 2476 } 2477 2478 @Override 2479 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2480 boolean handled = false; 2481 if (includeForAccessibility()) { 2482 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2483 if (handled) { 2484 return handled; 2485 } 2486 } 2487 // Let our children have a shot in populating the event. 2488 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2489 try { 2490 final int childCount = children.getChildCount(); 2491 for (int i = 0; i < childCount; i++) { 2492 View child = children.getChildAt(i); 2493 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2494 handled = child.dispatchPopulateAccessibilityEvent(event); 2495 if (handled) { 2496 return handled; 2497 } 2498 } 2499 } 2500 } finally { 2501 children.recycle(); 2502 } 2503 return false; 2504 } 2505 2506 @Override 2507 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2508 super.onInitializeAccessibilityNodeInfoInternal(info); 2509 if (mAttachInfo != null) { 2510 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2511 childrenForAccessibility.clear(); 2512 addChildrenForAccessibility(childrenForAccessibility); 2513 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2514 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2515 View child = childrenForAccessibility.get(i); 2516 info.addChild(child); 2517 } 2518 childrenForAccessibility.clear(); 2519 } 2520 } 2521 2522 @Override 2523 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2524 super.onInitializeAccessibilityEventInternal(event); 2525 event.setClassName(ViewGroup.class.getName()); 2526 } 2527 2528 @Override 2529 public void childAccessibilityStateChanged(View root) { 2530 if (mParent != null) { 2531 try { 2532 mParent.childAccessibilityStateChanged(root); 2533 } catch (AbstractMethodError e) { 2534 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2535 " does not fully implement ViewParent", e); 2536 } 2537 } 2538 } 2539 2540 @Override 2541 void resetSubtreeAccessibilityStateChanged() { 2542 super.resetSubtreeAccessibilityStateChanged(); 2543 View[] children = mChildren; 2544 final int childCount = mChildrenCount; 2545 for (int i = 0; i < childCount; i++) { 2546 children[i].resetSubtreeAccessibilityStateChanged(); 2547 } 2548 } 2549 2550 /** 2551 * {@inheritDoc} 2552 */ 2553 @Override 2554 void dispatchDetachedFromWindow() { 2555 // If we still have a touch target, we are still in the process of 2556 // dispatching motion events to a child; we need to get rid of that 2557 // child to avoid dispatching events to it after the window is torn 2558 // down. To make sure we keep the child in a consistent state, we 2559 // first send it an ACTION_CANCEL motion event. 2560 cancelAndClearTouchTargets(null); 2561 2562 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2563 exitHoverTargets(); 2564 2565 // In case view is detached while transition is running 2566 mLayoutCalledWhileSuppressed = false; 2567 2568 // Tear down our drag tracking 2569 mDragNotifiedChildren = null; 2570 if (mCurrentDrag != null) { 2571 mCurrentDrag.recycle(); 2572 mCurrentDrag = null; 2573 } 2574 2575 final int count = mChildrenCount; 2576 final View[] children = mChildren; 2577 for (int i = 0; i < count; i++) { 2578 children[i].dispatchDetachedFromWindow(); 2579 } 2580 super.dispatchDetachedFromWindow(); 2581 } 2582 2583 /** 2584 * @hide 2585 */ 2586 @Override 2587 protected void internalSetPadding(int left, int top, int right, int bottom) { 2588 super.internalSetPadding(left, top, right, bottom); 2589 2590 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2591 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2592 } else { 2593 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2594 } 2595 } 2596 2597 /** 2598 * {@inheritDoc} 2599 */ 2600 @Override 2601 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2602 super.dispatchSaveInstanceState(container); 2603 final int count = mChildrenCount; 2604 final View[] children = mChildren; 2605 for (int i = 0; i < count; i++) { 2606 View c = children[i]; 2607 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2608 c.dispatchSaveInstanceState(container); 2609 } 2610 } 2611 } 2612 2613 /** 2614 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2615 * to only this view, not to its children. For use when overriding 2616 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2617 * subclasses to freeze their own state but not the state of their children. 2618 * 2619 * @param container the container 2620 */ 2621 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2622 super.dispatchSaveInstanceState(container); 2623 } 2624 2625 /** 2626 * {@inheritDoc} 2627 */ 2628 @Override 2629 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2630 super.dispatchRestoreInstanceState(container); 2631 final int count = mChildrenCount; 2632 final View[] children = mChildren; 2633 for (int i = 0; i < count; i++) { 2634 View c = children[i]; 2635 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2636 c.dispatchRestoreInstanceState(container); 2637 } 2638 } 2639 } 2640 2641 /** 2642 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2643 * to only this view, not to its children. For use when overriding 2644 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2645 * subclasses to thaw their own state but not the state of their children. 2646 * 2647 * @param container the container 2648 */ 2649 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2650 super.dispatchRestoreInstanceState(container); 2651 } 2652 2653 /** 2654 * Enables or disables the drawing cache for each child of this view group. 2655 * 2656 * @param enabled true to enable the cache, false to dispose of it 2657 */ 2658 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2659 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2660 final View[] children = mChildren; 2661 final int count = mChildrenCount; 2662 for (int i = 0; i < count; i++) { 2663 children[i].setDrawingCacheEnabled(enabled); 2664 } 2665 } 2666 } 2667 2668 @Override 2669 protected void onAnimationStart() { 2670 super.onAnimationStart(); 2671 2672 // When this ViewGroup's animation starts, build the cache for the children 2673 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2674 final int count = mChildrenCount; 2675 final View[] children = mChildren; 2676 final boolean buildCache = !isHardwareAccelerated(); 2677 2678 for (int i = 0; i < count; i++) { 2679 final View child = children[i]; 2680 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2681 child.setDrawingCacheEnabled(true); 2682 if (buildCache) { 2683 child.buildDrawingCache(true); 2684 } 2685 } 2686 } 2687 2688 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2689 } 2690 } 2691 2692 @Override 2693 protected void onAnimationEnd() { 2694 super.onAnimationEnd(); 2695 2696 // When this ViewGroup's animation ends, destroy the cache of the children 2697 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2698 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2699 2700 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2701 setChildrenDrawingCacheEnabled(false); 2702 } 2703 } 2704 } 2705 2706 @Override 2707 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2708 int count = mChildrenCount; 2709 int[] visibilities = null; 2710 2711 if (skipChildren) { 2712 visibilities = new int[count]; 2713 for (int i = 0; i < count; i++) { 2714 View child = getChildAt(i); 2715 visibilities[i] = child.getVisibility(); 2716 if (visibilities[i] == View.VISIBLE) { 2717 child.setVisibility(INVISIBLE); 2718 } 2719 } 2720 } 2721 2722 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2723 2724 if (skipChildren) { 2725 for (int i = 0; i < count; i++) { 2726 getChildAt(i).setVisibility(visibilities[i]); 2727 } 2728 } 2729 2730 return b; 2731 } 2732 2733 /** Return true if this ViewGroup is laying out using optical bounds. */ 2734 boolean isLayoutModeOptical() { 2735 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2736 } 2737 2738 Insets computeOpticalInsets() { 2739 if (isLayoutModeOptical()) { 2740 int left = 0; 2741 int top = 0; 2742 int right = 0; 2743 int bottom = 0; 2744 for (int i = 0; i < mChildrenCount; i++) { 2745 View child = getChildAt(i); 2746 if (child.getVisibility() == VISIBLE) { 2747 Insets insets = child.getOpticalInsets(); 2748 left = Math.max(left, insets.left); 2749 top = Math.max(top, insets.top); 2750 right = Math.max(right, insets.right); 2751 bottom = Math.max(bottom, insets.bottom); 2752 } 2753 } 2754 return Insets.of(left, top, right, bottom); 2755 } else { 2756 return Insets.NONE; 2757 } 2758 } 2759 2760 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2761 if (x1 != x2 && y1 != y2) { 2762 if (x1 > x2) { 2763 int tmp = x1; x1 = x2; x2 = tmp; 2764 } 2765 if (y1 > y2) { 2766 int tmp = y1; y1 = y2; y2 = tmp; 2767 } 2768 canvas.drawRect(x1, y1, x2, y2, paint); 2769 } 2770 } 2771 2772 private static int sign(int x) { 2773 return (x >= 0) ? 1 : -1; 2774 } 2775 2776 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2777 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2778 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2779 } 2780 2781 private int dipsToPixels(int dips) { 2782 float scale = getContext().getResources().getDisplayMetrics().density; 2783 return (int) (dips * scale + 0.5f); 2784 } 2785 2786 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2787 int lineLength, int lineWidth) { 2788 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2789 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2790 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2791 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2792 } 2793 2794 private static void fillDifference(Canvas canvas, 2795 int x2, int y2, int x3, int y3, 2796 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2797 int x1 = x2 - dx1; 2798 int y1 = y2 - dy1; 2799 2800 int x4 = x3 + dx2; 2801 int y4 = y3 + dy2; 2802 2803 fillRect(canvas, paint, x1, y1, x4, y2); 2804 fillRect(canvas, paint, x1, y2, x2, y3); 2805 fillRect(canvas, paint, x3, y2, x4, y3); 2806 fillRect(canvas, paint, x1, y3, x4, y4); 2807 } 2808 2809 /** 2810 * @hide 2811 */ 2812 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2813 for (int i = 0; i < getChildCount(); i++) { 2814 View c = getChildAt(i); 2815 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2816 } 2817 } 2818 2819 /** 2820 * @hide 2821 */ 2822 protected void onDebugDraw(Canvas canvas) { 2823 Paint paint = getDebugPaint(); 2824 2825 // Draw optical bounds 2826 { 2827 paint.setColor(Color.RED); 2828 paint.setStyle(Paint.Style.STROKE); 2829 2830 for (int i = 0; i < getChildCount(); i++) { 2831 View c = getChildAt(i); 2832 Insets insets = c.getOpticalInsets(); 2833 2834 drawRect(canvas, paint, 2835 c.getLeft() + insets.left, 2836 c.getTop() + insets.top, 2837 c.getRight() - insets.right - 1, 2838 c.getBottom() - insets.bottom - 1); 2839 } 2840 } 2841 2842 // Draw margins 2843 { 2844 paint.setColor(Color.argb(63, 255, 0, 255)); 2845 paint.setStyle(Paint.Style.FILL); 2846 2847 onDebugDrawMargins(canvas, paint); 2848 } 2849 2850 // Draw clip bounds 2851 { 2852 paint.setColor(Color.rgb(63, 127, 255)); 2853 paint.setStyle(Paint.Style.FILL); 2854 2855 int lineLength = dipsToPixels(8); 2856 int lineWidth = dipsToPixels(1); 2857 for (int i = 0; i < getChildCount(); i++) { 2858 View c = getChildAt(i); 2859 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2860 paint, lineLength, lineWidth); 2861 } 2862 } 2863 } 2864 2865 /** 2866 * {@inheritDoc} 2867 */ 2868 @Override 2869 protected void dispatchDraw(Canvas canvas) { 2870 final int count = mChildrenCount; 2871 final View[] children = mChildren; 2872 int flags = mGroupFlags; 2873 2874 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2875 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2876 2877 final boolean buildCache = !isHardwareAccelerated(); 2878 for (int i = 0; i < count; i++) { 2879 final View child = children[i]; 2880 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2881 final LayoutParams params = child.getLayoutParams(); 2882 attachLayoutAnimationParameters(child, params, i, count); 2883 bindLayoutAnimation(child); 2884 if (cache) { 2885 child.setDrawingCacheEnabled(true); 2886 if (buildCache) { 2887 child.buildDrawingCache(true); 2888 } 2889 } 2890 } 2891 } 2892 2893 final LayoutAnimationController controller = mLayoutAnimationController; 2894 if (controller.willOverlap()) { 2895 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2896 } 2897 2898 controller.start(); 2899 2900 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2901 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2902 2903 if (cache) { 2904 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2905 } 2906 2907 if (mAnimationListener != null) { 2908 mAnimationListener.onAnimationStart(controller.getAnimation()); 2909 } 2910 } 2911 2912 int saveCount = 0; 2913 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2914 if (clipToPadding) { 2915 saveCount = canvas.save(); 2916 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2917 mScrollX + mRight - mLeft - mPaddingRight, 2918 mScrollY + mBottom - mTop - mPaddingBottom); 2919 2920 } 2921 2922 // We will draw our child's animation, let's reset the flag 2923 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2924 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2925 2926 boolean more = false; 2927 final long drawingTime = getDrawingTime(); 2928 2929 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2930 for (int i = 0; i < count; i++) { 2931 final View child = children[i]; 2932 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2933 more |= drawChild(canvas, child, drawingTime); 2934 } 2935 } 2936 } else { 2937 for (int i = 0; i < count; i++) { 2938 final View child = children[getChildDrawingOrder(count, i)]; 2939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2940 more |= drawChild(canvas, child, drawingTime); 2941 } 2942 } 2943 } 2944 2945 // Draw any disappearing views that have animations 2946 if (mDisappearingChildren != null) { 2947 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2948 final int disappearingCount = disappearingChildren.size() - 1; 2949 // Go backwards -- we may delete as animations finish 2950 for (int i = disappearingCount; i >= 0; i--) { 2951 final View child = disappearingChildren.get(i); 2952 more |= drawChild(canvas, child, drawingTime); 2953 } 2954 } 2955 2956 if (debugDraw()) { 2957 onDebugDraw(canvas); 2958 } 2959 2960 if (clipToPadding) { 2961 canvas.restoreToCount(saveCount); 2962 } 2963 2964 // mGroupFlags might have been updated by drawChild() 2965 flags = mGroupFlags; 2966 2967 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2968 invalidate(true); 2969 } 2970 2971 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2972 mLayoutAnimationController.isDone() && !more) { 2973 // We want to erase the drawing cache and notify the listener after the 2974 // next frame is drawn because one extra invalidate() is caused by 2975 // drawChild() after the animation is over 2976 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2977 final Runnable end = new Runnable() { 2978 public void run() { 2979 notifyAnimationListener(); 2980 } 2981 }; 2982 post(end); 2983 } 2984 } 2985 2986 /** 2987 * Returns the ViewGroupOverlay for this view group, creating it if it does 2988 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 2989 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 2990 * views, like overlay drawables, are visual-only; they do not receive input 2991 * events and should not be used as anything other than a temporary 2992 * representation of a view in a parent container, such as might be used 2993 * by an animation effect. 2994 * 2995 * <p>Note: Overlays do not currently work correctly with {@link 2996 * SurfaceView} or {@link TextureView}; contents in overlays for these 2997 * types of views may not display correctly.</p> 2998 * 2999 * @return The ViewGroupOverlay object for this view. 3000 * @see ViewGroupOverlay 3001 */ 3002 @Override 3003 public ViewGroupOverlay getOverlay() { 3004 if (mOverlay == null) { 3005 mOverlay = new ViewGroupOverlay(mContext, this); 3006 } 3007 return (ViewGroupOverlay) mOverlay; 3008 } 3009 3010 /** 3011 * Returns the index of the child to draw for this iteration. Override this 3012 * if you want to change the drawing order of children. By default, it 3013 * returns i. 3014 * <p> 3015 * NOTE: In order for this method to be called, you must enable child ordering 3016 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3017 * 3018 * @param i The current iteration. 3019 * @return The index of the child to draw this iteration. 3020 * 3021 * @see #setChildrenDrawingOrderEnabled(boolean) 3022 * @see #isChildrenDrawingOrderEnabled() 3023 */ 3024 protected int getChildDrawingOrder(int childCount, int i) { 3025 return i; 3026 } 3027 3028 private void notifyAnimationListener() { 3029 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3030 mGroupFlags |= FLAG_ANIMATION_DONE; 3031 3032 if (mAnimationListener != null) { 3033 final Runnable end = new Runnable() { 3034 public void run() { 3035 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3036 } 3037 }; 3038 post(end); 3039 } 3040 3041 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3042 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3043 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3044 setChildrenDrawingCacheEnabled(false); 3045 } 3046 } 3047 3048 invalidate(true); 3049 } 3050 3051 /** 3052 * This method is used to cause children of this ViewGroup to restore or recreate their 3053 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3054 * to recreate its own display list, which would happen if it went through the normal 3055 * draw/dispatchDraw mechanisms. 3056 * 3057 * @hide 3058 */ 3059 @Override 3060 protected void dispatchGetDisplayList() { 3061 final int count = mChildrenCount; 3062 final View[] children = mChildren; 3063 for (int i = 0; i < count; i++) { 3064 final View child = children[i]; 3065 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3066 child.hasStaticLayer()) { 3067 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3068 == PFLAG_INVALIDATED; 3069 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3070 child.getDisplayList(); 3071 child.mRecreateDisplayList = false; 3072 } 3073 } 3074 if (mOverlay != null) { 3075 View overlayView = mOverlay.getOverlayView(); 3076 overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) 3077 == PFLAG_INVALIDATED; 3078 overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; 3079 overlayView.getDisplayList(); 3080 overlayView.mRecreateDisplayList = false; 3081 } 3082 } 3083 3084 /** 3085 * Draw one child of this View Group. This method is responsible for getting 3086 * the canvas in the right state. This includes clipping, translating so 3087 * that the child's scrolled origin is at 0, 0, and applying any animation 3088 * transformations. 3089 * 3090 * @param canvas The canvas on which to draw the child 3091 * @param child Who to draw 3092 * @param drawingTime The time at which draw is occurring 3093 * @return True if an invalidate() was issued 3094 */ 3095 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3096 return child.draw(canvas, this, drawingTime); 3097 } 3098 3099 /** 3100 * Returns whether ths group's children are clipped to their bounds before drawing. 3101 * The default value is true. 3102 * @see #setClipChildren(boolean) 3103 * 3104 * @return True if the group's children will be clipped to their bounds, 3105 * false otherwise. 3106 */ 3107 public boolean getClipChildren() { 3108 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3109 } 3110 3111 /** 3112 * By default, children are clipped to their bounds before drawing. This 3113 * allows view groups to override this behavior for animations, etc. 3114 * 3115 * @param clipChildren true to clip children to their bounds, 3116 * false otherwise 3117 * @attr ref android.R.styleable#ViewGroup_clipChildren 3118 */ 3119 public void setClipChildren(boolean clipChildren) { 3120 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3121 if (clipChildren != previousValue) { 3122 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3123 for (int i = 0; i < mChildrenCount; ++i) { 3124 View child = getChildAt(i); 3125 if (child.mDisplayList != null) { 3126 child.mDisplayList.setClipToBounds(clipChildren); 3127 } 3128 } 3129 } 3130 } 3131 3132 /** 3133 * By default, children are clipped to the padding of the ViewGroup. This 3134 * allows view groups to override this behavior 3135 * 3136 * @param clipToPadding true to clip children to the padding of the 3137 * group, false otherwise 3138 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3139 */ 3140 public void setClipToPadding(boolean clipToPadding) { 3141 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3142 } 3143 3144 /** 3145 * {@inheritDoc} 3146 */ 3147 @Override 3148 public void dispatchSetSelected(boolean selected) { 3149 final View[] children = mChildren; 3150 final int count = mChildrenCount; 3151 for (int i = 0; i < count; i++) { 3152 children[i].setSelected(selected); 3153 } 3154 } 3155 3156 /** 3157 * {@inheritDoc} 3158 */ 3159 @Override 3160 public void dispatchSetActivated(boolean activated) { 3161 final View[] children = mChildren; 3162 final int count = mChildrenCount; 3163 for (int i = 0; i < count; i++) { 3164 children[i].setActivated(activated); 3165 } 3166 } 3167 3168 @Override 3169 protected void dispatchSetPressed(boolean pressed) { 3170 final View[] children = mChildren; 3171 final int count = mChildrenCount; 3172 for (int i = 0; i < count; i++) { 3173 final View child = children[i]; 3174 // Children that are clickable on their own should not 3175 // show a pressed state when their parent view does. 3176 // Clearing a pressed state always propagates. 3177 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3178 child.setPressed(pressed); 3179 } 3180 } 3181 } 3182 3183 /** 3184 * When this property is set to true, this ViewGroup supports static transformations on 3185 * children; this causes 3186 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3187 * invoked when a child is drawn. 3188 * 3189 * Any subclass overriding 3190 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3191 * set this property to true. 3192 * 3193 * @param enabled True to enable static transformations on children, false otherwise. 3194 * 3195 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3196 */ 3197 protected void setStaticTransformationsEnabled(boolean enabled) { 3198 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3199 } 3200 3201 /** 3202 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3203 * boolean to indicate whether a static transform was set. The default implementation 3204 * simply returns <code>false</code>; subclasses may override this method for different 3205 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3206 * for this method to be called. 3207 * 3208 * @param child The child view whose static transform is being requested 3209 * @param t The Transformation which will hold the result 3210 * @return true if the transformation was set, false otherwise 3211 * @see #setStaticTransformationsEnabled(boolean) 3212 */ 3213 protected boolean getChildStaticTransformation(View child, Transformation t) { 3214 return false; 3215 } 3216 3217 Transformation getChildTransformation() { 3218 if (mChildTransformation == null) { 3219 mChildTransformation = new Transformation(); 3220 } 3221 return mChildTransformation; 3222 } 3223 3224 /** 3225 * {@hide} 3226 */ 3227 @Override 3228 protected View findViewTraversal(int id) { 3229 if (id == mID) { 3230 return this; 3231 } 3232 3233 final View[] where = mChildren; 3234 final int len = mChildrenCount; 3235 3236 for (int i = 0; i < len; i++) { 3237 View v = where[i]; 3238 3239 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3240 v = v.findViewById(id); 3241 3242 if (v != null) { 3243 return v; 3244 } 3245 } 3246 } 3247 3248 return null; 3249 } 3250 3251 /** 3252 * {@hide} 3253 */ 3254 @Override 3255 protected View findViewWithTagTraversal(Object tag) { 3256 if (tag != null && tag.equals(mTag)) { 3257 return this; 3258 } 3259 3260 final View[] where = mChildren; 3261 final int len = mChildrenCount; 3262 3263 for (int i = 0; i < len; i++) { 3264 View v = where[i]; 3265 3266 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3267 v = v.findViewWithTag(tag); 3268 3269 if (v != null) { 3270 return v; 3271 } 3272 } 3273 } 3274 3275 return null; 3276 } 3277 3278 /** 3279 * {@hide} 3280 */ 3281 @Override 3282 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3283 if (predicate.apply(this)) { 3284 return this; 3285 } 3286 3287 final View[] where = mChildren; 3288 final int len = mChildrenCount; 3289 3290 for (int i = 0; i < len; i++) { 3291 View v = where[i]; 3292 3293 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3294 v = v.findViewByPredicate(predicate); 3295 3296 if (v != null) { 3297 return v; 3298 } 3299 } 3300 } 3301 3302 return null; 3303 } 3304 3305 /** 3306 * <p>Adds a child view. If no layout parameters are already set on the child, the 3307 * default parameters for this ViewGroup are set on the child.</p> 3308 * 3309 * <p><strong>Note:</strong> do not invoke this method from 3310 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3311 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3312 * 3313 * @param child the child view to add 3314 * 3315 * @see #generateDefaultLayoutParams() 3316 */ 3317 public void addView(View child) { 3318 addView(child, -1); 3319 } 3320 3321 /** 3322 * Adds a child view. If no layout parameters are already set on the child, the 3323 * default parameters for this ViewGroup are set on the child. 3324 * 3325 * <p><strong>Note:</strong> do not invoke this method from 3326 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3327 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3328 * 3329 * @param child the child view to add 3330 * @param index the position at which to add the child 3331 * 3332 * @see #generateDefaultLayoutParams() 3333 */ 3334 public void addView(View child, int index) { 3335 LayoutParams params = child.getLayoutParams(); 3336 if (params == null) { 3337 params = generateDefaultLayoutParams(); 3338 if (params == null) { 3339 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3340 } 3341 } 3342 addView(child, index, params); 3343 } 3344 3345 /** 3346 * Adds a child view with this ViewGroup's default layout parameters and the 3347 * specified width and height. 3348 * 3349 * <p><strong>Note:</strong> do not invoke this method from 3350 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3351 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3352 * 3353 * @param child the child view to add 3354 */ 3355 public void addView(View child, int width, int height) { 3356 final LayoutParams params = generateDefaultLayoutParams(); 3357 params.width = width; 3358 params.height = height; 3359 addView(child, -1, params); 3360 } 3361 3362 /** 3363 * Adds a child view with the specified layout parameters. 3364 * 3365 * <p><strong>Note:</strong> do not invoke this method from 3366 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3367 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3368 * 3369 * @param child the child view to add 3370 * @param params the layout parameters to set on the child 3371 */ 3372 public void addView(View child, LayoutParams params) { 3373 addView(child, -1, params); 3374 } 3375 3376 /** 3377 * Adds a child view with the specified layout parameters. 3378 * 3379 * <p><strong>Note:</strong> do not invoke this method from 3380 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3381 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3382 * 3383 * @param child the child view to add 3384 * @param index the position at which to add the child 3385 * @param params the layout parameters to set on the child 3386 */ 3387 public void addView(View child, int index, LayoutParams params) { 3388 if (DBG) { 3389 System.out.println(this + " addView"); 3390 } 3391 3392 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3393 // therefore, we call requestLayout() on ourselves before, so that the child's request 3394 // will be blocked at our level 3395 requestLayout(); 3396 invalidate(true); 3397 addViewInner(child, index, params, false); 3398 } 3399 3400 /** 3401 * {@inheritDoc} 3402 */ 3403 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3404 if (!checkLayoutParams(params)) { 3405 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3406 } 3407 if (view.mParent != this) { 3408 throw new IllegalArgumentException("Given view not a child of " + this); 3409 } 3410 view.setLayoutParams(params); 3411 } 3412 3413 /** 3414 * {@inheritDoc} 3415 */ 3416 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3417 return p != null; 3418 } 3419 3420 /** 3421 * Interface definition for a callback to be invoked when the hierarchy 3422 * within this view changed. The hierarchy changes whenever a child is added 3423 * to or removed from this view. 3424 */ 3425 public interface OnHierarchyChangeListener { 3426 /** 3427 * Called when a new child is added to a parent view. 3428 * 3429 * @param parent the view in which a child was added 3430 * @param child the new child view added in the hierarchy 3431 */ 3432 void onChildViewAdded(View parent, View child); 3433 3434 /** 3435 * Called when a child is removed from a parent view. 3436 * 3437 * @param parent the view from which the child was removed 3438 * @param child the child removed from the hierarchy 3439 */ 3440 void onChildViewRemoved(View parent, View child); 3441 } 3442 3443 /** 3444 * Register a callback to be invoked when a child is added to or removed 3445 * from this view. 3446 * 3447 * @param listener the callback to invoke on hierarchy change 3448 */ 3449 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3450 mOnHierarchyChangeListener = listener; 3451 } 3452 3453 /** 3454 * @hide 3455 */ 3456 protected void onViewAdded(View child) { 3457 if (mOnHierarchyChangeListener != null) { 3458 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3459 } 3460 } 3461 3462 /** 3463 * @hide 3464 */ 3465 protected void onViewRemoved(View child) { 3466 if (mOnHierarchyChangeListener != null) { 3467 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3468 } 3469 } 3470 3471 private void clearCachedLayoutMode() { 3472 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3473 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3474 } 3475 } 3476 3477 @Override 3478 protected void onAttachedToWindow() { 3479 super.onAttachedToWindow(); 3480 clearCachedLayoutMode(); 3481 } 3482 3483 @Override 3484 protected void onDetachedFromWindow() { 3485 super.onDetachedFromWindow(); 3486 clearCachedLayoutMode(); 3487 } 3488 3489 /** 3490 * Adds a view during layout. This is useful if in your onLayout() method, 3491 * you need to add more views (as does the list view for example). 3492 * 3493 * If index is negative, it means put it at the end of the list. 3494 * 3495 * @param child the view to add to the group 3496 * @param index the index at which the child must be added 3497 * @param params the layout parameters to associate with the child 3498 * @return true if the child was added, false otherwise 3499 */ 3500 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3501 return addViewInLayout(child, index, params, false); 3502 } 3503 3504 /** 3505 * Adds a view during layout. This is useful if in your onLayout() method, 3506 * you need to add more views (as does the list view for example). 3507 * 3508 * If index is negative, it means put it at the end of the list. 3509 * 3510 * @param child the view to add to the group 3511 * @param index the index at which the child must be added 3512 * @param params the layout parameters to associate with the child 3513 * @param preventRequestLayout if true, calling this method will not trigger a 3514 * layout request on child 3515 * @return true if the child was added, false otherwise 3516 */ 3517 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3518 boolean preventRequestLayout) { 3519 child.mParent = null; 3520 addViewInner(child, index, params, preventRequestLayout); 3521 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3522 return true; 3523 } 3524 3525 /** 3526 * Prevents the specified child to be laid out during the next layout pass. 3527 * 3528 * @param child the child on which to perform the cleanup 3529 */ 3530 protected void cleanupLayoutState(View child) { 3531 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3532 } 3533 3534 private void addViewInner(View child, int index, LayoutParams params, 3535 boolean preventRequestLayout) { 3536 3537 if (mTransition != null) { 3538 // Don't prevent other add transitions from completing, but cancel remove 3539 // transitions to let them complete the process before we add to the container 3540 mTransition.cancel(LayoutTransition.DISAPPEARING); 3541 } 3542 3543 if (child.getParent() != null) { 3544 throw new IllegalStateException("The specified child already has a parent. " + 3545 "You must call removeView() on the child's parent first."); 3546 } 3547 3548 if (mTransition != null) { 3549 mTransition.addChild(this, child); 3550 } 3551 3552 if (!checkLayoutParams(params)) { 3553 params = generateLayoutParams(params); 3554 } 3555 3556 if (preventRequestLayout) { 3557 child.mLayoutParams = params; 3558 } else { 3559 child.setLayoutParams(params); 3560 } 3561 3562 if (index < 0) { 3563 index = mChildrenCount; 3564 } 3565 3566 addInArray(child, index); 3567 3568 // tell our children 3569 if (preventRequestLayout) { 3570 child.assignParent(this); 3571 } else { 3572 child.mParent = this; 3573 } 3574 3575 if (child.hasFocus()) { 3576 requestChildFocus(child, child.findFocus()); 3577 } 3578 3579 AttachInfo ai = mAttachInfo; 3580 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3581 boolean lastKeepOn = ai.mKeepScreenOn; 3582 ai.mKeepScreenOn = false; 3583 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3584 if (ai.mKeepScreenOn) { 3585 needGlobalAttributesUpdate(true); 3586 } 3587 ai.mKeepScreenOn = lastKeepOn; 3588 } 3589 3590 if (child.isLayoutDirectionInherited()) { 3591 child.resetRtlProperties(); 3592 } 3593 3594 onViewAdded(child); 3595 3596 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3597 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3598 } 3599 3600 if (child.hasTransientState()) { 3601 childHasTransientStateChanged(child, true); 3602 } 3603 3604 if (child.isImportantForAccessibility() && child.getVisibility() != View.GONE) { 3605 notifySubtreeAccessibilityStateChangedIfNeeded(); 3606 } 3607 } 3608 3609 private void addInArray(View child, int index) { 3610 View[] children = mChildren; 3611 final int count = mChildrenCount; 3612 final int size = children.length; 3613 if (index == count) { 3614 if (size == count) { 3615 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3616 System.arraycopy(children, 0, mChildren, 0, size); 3617 children = mChildren; 3618 } 3619 children[mChildrenCount++] = child; 3620 } else if (index < count) { 3621 if (size == count) { 3622 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3623 System.arraycopy(children, 0, mChildren, 0, index); 3624 System.arraycopy(children, index, mChildren, index + 1, count - index); 3625 children = mChildren; 3626 } else { 3627 System.arraycopy(children, index, children, index + 1, count - index); 3628 } 3629 children[index] = child; 3630 mChildrenCount++; 3631 if (mLastTouchDownIndex >= index) { 3632 mLastTouchDownIndex++; 3633 } 3634 } else { 3635 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3636 } 3637 } 3638 3639 // This method also sets the child's mParent to null 3640 private void removeFromArray(int index) { 3641 final View[] children = mChildren; 3642 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3643 children[index].mParent = null; 3644 } 3645 final int count = mChildrenCount; 3646 if (index == count - 1) { 3647 children[--mChildrenCount] = null; 3648 } else if (index >= 0 && index < count) { 3649 System.arraycopy(children, index + 1, children, index, count - index - 1); 3650 children[--mChildrenCount] = null; 3651 } else { 3652 throw new IndexOutOfBoundsException(); 3653 } 3654 if (mLastTouchDownIndex == index) { 3655 mLastTouchDownTime = 0; 3656 mLastTouchDownIndex = -1; 3657 } else if (mLastTouchDownIndex > index) { 3658 mLastTouchDownIndex--; 3659 } 3660 } 3661 3662 // This method also sets the children's mParent to null 3663 private void removeFromArray(int start, int count) { 3664 final View[] children = mChildren; 3665 final int childrenCount = mChildrenCount; 3666 3667 start = Math.max(0, start); 3668 final int end = Math.min(childrenCount, start + count); 3669 3670 if (start == end) { 3671 return; 3672 } 3673 3674 if (end == childrenCount) { 3675 for (int i = start; i < end; i++) { 3676 children[i].mParent = null; 3677 children[i] = null; 3678 } 3679 } else { 3680 for (int i = start; i < end; i++) { 3681 children[i].mParent = null; 3682 } 3683 3684 // Since we're looping above, we might as well do the copy, but is arraycopy() 3685 // faster than the extra 2 bounds checks we would do in the loop? 3686 System.arraycopy(children, end, children, start, childrenCount - end); 3687 3688 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3689 children[i] = null; 3690 } 3691 } 3692 3693 mChildrenCount -= (end - start); 3694 } 3695 3696 private void bindLayoutAnimation(View child) { 3697 Animation a = mLayoutAnimationController.getAnimationForView(child); 3698 child.setAnimation(a); 3699 } 3700 3701 /** 3702 * Subclasses should override this method to set layout animation 3703 * parameters on the supplied child. 3704 * 3705 * @param child the child to associate with animation parameters 3706 * @param params the child's layout parameters which hold the animation 3707 * parameters 3708 * @param index the index of the child in the view group 3709 * @param count the number of children in the view group 3710 */ 3711 protected void attachLayoutAnimationParameters(View child, 3712 LayoutParams params, int index, int count) { 3713 LayoutAnimationController.AnimationParameters animationParams = 3714 params.layoutAnimationParameters; 3715 if (animationParams == null) { 3716 animationParams = new LayoutAnimationController.AnimationParameters(); 3717 params.layoutAnimationParameters = animationParams; 3718 } 3719 3720 animationParams.count = count; 3721 animationParams.index = index; 3722 } 3723 3724 /** 3725 * {@inheritDoc} 3726 * 3727 * <p><strong>Note:</strong> do not invoke this method from 3728 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3729 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3730 */ 3731 public void removeView(View view) { 3732 removeViewInternal(view); 3733 requestLayout(); 3734 invalidate(true); 3735 } 3736 3737 /** 3738 * Removes a view during layout. This is useful if in your onLayout() method, 3739 * you need to remove more views. 3740 * 3741 * <p><strong>Note:</strong> do not invoke this method from 3742 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3743 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3744 * 3745 * @param view the view to remove from the group 3746 */ 3747 public void removeViewInLayout(View view) { 3748 removeViewInternal(view); 3749 } 3750 3751 /** 3752 * Removes a range of views during layout. This is useful if in your onLayout() method, 3753 * you need to remove more views. 3754 * 3755 * <p><strong>Note:</strong> do not invoke this method from 3756 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3757 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3758 * 3759 * @param start the index of the first view to remove from the group 3760 * @param count the number of views to remove from the group 3761 */ 3762 public void removeViewsInLayout(int start, int count) { 3763 removeViewsInternal(start, count); 3764 } 3765 3766 /** 3767 * Removes the view at the specified position in the group. 3768 * 3769 * <p><strong>Note:</strong> do not invoke this method from 3770 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3771 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3772 * 3773 * @param index the position in the group of the view to remove 3774 */ 3775 public void removeViewAt(int index) { 3776 removeViewInternal(index, getChildAt(index)); 3777 requestLayout(); 3778 invalidate(true); 3779 } 3780 3781 /** 3782 * Removes the specified range of views from the group. 3783 * 3784 * <p><strong>Note:</strong> do not invoke this method from 3785 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3786 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3787 * 3788 * @param start the first position in the group of the range of views to remove 3789 * @param count the number of views to remove 3790 */ 3791 public void removeViews(int start, int count) { 3792 removeViewsInternal(start, count); 3793 requestLayout(); 3794 invalidate(true); 3795 } 3796 3797 private void removeViewInternal(View view) { 3798 final int index = indexOfChild(view); 3799 if (index >= 0) { 3800 removeViewInternal(index, view); 3801 } 3802 } 3803 3804 private void removeViewInternal(int index, View view) { 3805 3806 if (mTransition != null) { 3807 mTransition.removeChild(this, view); 3808 } 3809 3810 boolean clearChildFocus = false; 3811 if (view == mFocused) { 3812 view.unFocus(); 3813 clearChildFocus = true; 3814 } 3815 3816 if (view.isAccessibilityFocused()) { 3817 view.clearAccessibilityFocus(); 3818 } 3819 3820 cancelTouchTarget(view); 3821 cancelHoverTarget(view); 3822 3823 if (view.getAnimation() != null || 3824 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3825 addDisappearingView(view); 3826 } else if (view.mAttachInfo != null) { 3827 view.dispatchDetachedFromWindow(); 3828 } 3829 3830 if (view.hasTransientState()) { 3831 childHasTransientStateChanged(view, false); 3832 } 3833 3834 needGlobalAttributesUpdate(false); 3835 3836 removeFromArray(index); 3837 3838 if (clearChildFocus) { 3839 clearChildFocus(view); 3840 if (!rootViewRequestFocus()) { 3841 notifyGlobalFocusCleared(this); 3842 } 3843 } 3844 3845 onViewRemoved(view); 3846 3847 if (view.isImportantForAccessibility() && view.getVisibility() != View.GONE) { 3848 notifySubtreeAccessibilityStateChangedIfNeeded(); 3849 } 3850 } 3851 3852 /** 3853 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3854 * not null, changes in layout which occur because of children being added to or removed from 3855 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3856 * object. By default, the transition object is null (so layout changes are not animated). 3857 * 3858 * <p>Replacing a non-null transition will cause that previous transition to be 3859 * canceled, if it is currently running, to restore this container to 3860 * its correct post-transition state.</p> 3861 * 3862 * @param transition The LayoutTransition object that will animated changes in layout. A value 3863 * of <code>null</code> means no transition will run on layout changes. 3864 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3865 */ 3866 public void setLayoutTransition(LayoutTransition transition) { 3867 if (mTransition != null) { 3868 LayoutTransition previousTransition = mTransition; 3869 previousTransition.cancel(); 3870 previousTransition.removeTransitionListener(mLayoutTransitionListener); 3871 } 3872 mTransition = transition; 3873 if (mTransition != null) { 3874 mTransition.addTransitionListener(mLayoutTransitionListener); 3875 } 3876 } 3877 3878 /** 3879 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3880 * not null, changes in layout which occur because of children being added to or removed from 3881 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3882 * object. By default, the transition object is null (so layout changes are not animated). 3883 * 3884 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3885 * A value of <code>null</code> means no transition will run on layout changes. 3886 */ 3887 public LayoutTransition getLayoutTransition() { 3888 return mTransition; 3889 } 3890 3891 private void removeViewsInternal(int start, int count) { 3892 final View focused = mFocused; 3893 final boolean detach = mAttachInfo != null; 3894 boolean clearChildFocus = false; 3895 3896 final View[] children = mChildren; 3897 final int end = start + count; 3898 3899 for (int i = start; i < end; i++) { 3900 final View view = children[i]; 3901 3902 if (mTransition != null) { 3903 mTransition.removeChild(this, view); 3904 } 3905 3906 if (view == focused) { 3907 view.unFocus(); 3908 clearChildFocus = true; 3909 } 3910 3911 if (view.isAccessibilityFocused()) { 3912 view.clearAccessibilityFocus(); 3913 } 3914 3915 cancelTouchTarget(view); 3916 cancelHoverTarget(view); 3917 3918 if (view.getAnimation() != null || 3919 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3920 addDisappearingView(view); 3921 } else if (detach) { 3922 view.dispatchDetachedFromWindow(); 3923 } 3924 3925 if (view.hasTransientState()) { 3926 childHasTransientStateChanged(view, false); 3927 } 3928 3929 needGlobalAttributesUpdate(false); 3930 3931 onViewRemoved(view); 3932 } 3933 3934 removeFromArray(start, count); 3935 3936 if (clearChildFocus) { 3937 clearChildFocus(focused); 3938 if (!rootViewRequestFocus()) { 3939 notifyGlobalFocusCleared(focused); 3940 } 3941 } 3942 } 3943 3944 /** 3945 * Call this method to remove all child views from the 3946 * ViewGroup. 3947 * 3948 * <p><strong>Note:</strong> do not invoke this method from 3949 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3950 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3951 */ 3952 public void removeAllViews() { 3953 removeAllViewsInLayout(); 3954 requestLayout(); 3955 invalidate(true); 3956 } 3957 3958 /** 3959 * Called by a ViewGroup subclass to remove child views from itself, 3960 * when it must first know its size on screen before it can calculate how many 3961 * child views it will render. An example is a Gallery or a ListView, which 3962 * may "have" 50 children, but actually only render the number of children 3963 * that can currently fit inside the object on screen. Do not call 3964 * this method unless you are extending ViewGroup and understand the 3965 * view measuring and layout pipeline. 3966 * 3967 * <p><strong>Note:</strong> do not invoke this method from 3968 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3969 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3970 */ 3971 public void removeAllViewsInLayout() { 3972 final int count = mChildrenCount; 3973 if (count <= 0) { 3974 return; 3975 } 3976 3977 final View[] children = mChildren; 3978 mChildrenCount = 0; 3979 3980 final View focused = mFocused; 3981 final boolean detach = mAttachInfo != null; 3982 boolean clearChildFocus = false; 3983 3984 needGlobalAttributesUpdate(false); 3985 3986 for (int i = count - 1; i >= 0; i--) { 3987 final View view = children[i]; 3988 3989 if (mTransition != null) { 3990 mTransition.removeChild(this, view); 3991 } 3992 3993 if (view == focused) { 3994 view.unFocus(); 3995 clearChildFocus = true; 3996 } 3997 3998 if (view.isAccessibilityFocused()) { 3999 view.clearAccessibilityFocus(); 4000 } 4001 4002 cancelTouchTarget(view); 4003 cancelHoverTarget(view); 4004 4005 if (view.getAnimation() != null || 4006 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4007 addDisappearingView(view); 4008 } else if (detach) { 4009 view.dispatchDetachedFromWindow(); 4010 } 4011 4012 if (view.hasTransientState()) { 4013 childHasTransientStateChanged(view, false); 4014 } 4015 4016 onViewRemoved(view); 4017 4018 view.mParent = null; 4019 children[i] = null; 4020 } 4021 4022 if (clearChildFocus) { 4023 clearChildFocus(focused); 4024 if (!rootViewRequestFocus()) { 4025 notifyGlobalFocusCleared(focused); 4026 } 4027 } 4028 } 4029 4030 /** 4031 * Finishes the removal of a detached view. This method will dispatch the detached from 4032 * window event and notify the hierarchy change listener. 4033 * <p> 4034 * This method is intended to be lightweight and makes no assumptions about whether the 4035 * parent or child should be redrawn. Proper use of this method will include also making 4036 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4037 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4038 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4039 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4040 * 4041 * @param child the child to be definitely removed from the view hierarchy 4042 * @param animate if true and the view has an animation, the view is placed in the 4043 * disappearing views list, otherwise, it is detached from the window 4044 * 4045 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4046 * @see #detachAllViewsFromParent() 4047 * @see #detachViewFromParent(View) 4048 * @see #detachViewFromParent(int) 4049 */ 4050 protected void removeDetachedView(View child, boolean animate) { 4051 if (mTransition != null) { 4052 mTransition.removeChild(this, child); 4053 } 4054 4055 if (child == mFocused) { 4056 child.clearFocus(); 4057 } 4058 4059 child.clearAccessibilityFocus(); 4060 4061 cancelTouchTarget(child); 4062 cancelHoverTarget(child); 4063 4064 if ((animate && child.getAnimation() != null) || 4065 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4066 addDisappearingView(child); 4067 } else if (child.mAttachInfo != null) { 4068 child.dispatchDetachedFromWindow(); 4069 } 4070 4071 if (child.hasTransientState()) { 4072 childHasTransientStateChanged(child, false); 4073 } 4074 4075 onViewRemoved(child); 4076 } 4077 4078 /** 4079 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4080 * sets the layout parameters and puts the view in the list of children so that 4081 * it can be retrieved by calling {@link #getChildAt(int)}. 4082 * <p> 4083 * This method is intended to be lightweight and makes no assumptions about whether the 4084 * parent or child should be redrawn. Proper use of this method will include also making 4085 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4086 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4087 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4088 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4089 * <p> 4090 * This method should be called only for views which were detached from their parent. 4091 * 4092 * @param child the child to attach 4093 * @param index the index at which the child should be attached 4094 * @param params the layout parameters of the child 4095 * 4096 * @see #removeDetachedView(View, boolean) 4097 * @see #detachAllViewsFromParent() 4098 * @see #detachViewFromParent(View) 4099 * @see #detachViewFromParent(int) 4100 */ 4101 protected void attachViewToParent(View child, int index, LayoutParams params) { 4102 child.mLayoutParams = params; 4103 4104 if (index < 0) { 4105 index = mChildrenCount; 4106 } 4107 4108 addInArray(child, index); 4109 4110 child.mParent = this; 4111 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4112 & ~PFLAG_DRAWING_CACHE_VALID) 4113 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4114 this.mPrivateFlags |= PFLAG_INVALIDATED; 4115 4116 if (child.hasFocus()) { 4117 requestChildFocus(child, child.findFocus()); 4118 } 4119 } 4120 4121 /** 4122 * Detaches a view from its parent. Detaching a view should be followed 4123 * either by a call to 4124 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4125 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4126 * temporary; reattachment or removal should happen within the same drawing cycle as 4127 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4128 * call to {@link #getChildAt(int)}. 4129 * 4130 * @param child the child to detach 4131 * 4132 * @see #detachViewFromParent(int) 4133 * @see #detachViewsFromParent(int, int) 4134 * @see #detachAllViewsFromParent() 4135 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4136 * @see #removeDetachedView(View, boolean) 4137 */ 4138 protected void detachViewFromParent(View child) { 4139 removeFromArray(indexOfChild(child)); 4140 } 4141 4142 /** 4143 * Detaches a view from its parent. Detaching a view should be followed 4144 * either by a call to 4145 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4146 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4147 * temporary; reattachment or removal should happen within the same drawing cycle as 4148 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4149 * call to {@link #getChildAt(int)}. 4150 * 4151 * @param index the index of the child to detach 4152 * 4153 * @see #detachViewFromParent(View) 4154 * @see #detachAllViewsFromParent() 4155 * @see #detachViewsFromParent(int, int) 4156 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4157 * @see #removeDetachedView(View, boolean) 4158 */ 4159 protected void detachViewFromParent(int index) { 4160 removeFromArray(index); 4161 } 4162 4163 /** 4164 * Detaches a range of views from their parents. Detaching a view should be followed 4165 * either by a call to 4166 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4167 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4168 * temporary; reattachment or removal should happen within the same drawing cycle as 4169 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4170 * call to {@link #getChildAt(int)}. 4171 * 4172 * @param start the first index of the childrend range to detach 4173 * @param count the number of children to detach 4174 * 4175 * @see #detachViewFromParent(View) 4176 * @see #detachViewFromParent(int) 4177 * @see #detachAllViewsFromParent() 4178 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4179 * @see #removeDetachedView(View, boolean) 4180 */ 4181 protected void detachViewsFromParent(int start, int count) { 4182 removeFromArray(start, count); 4183 } 4184 4185 /** 4186 * Detaches all views from the parent. Detaching a view should be followed 4187 * either by a call to 4188 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4189 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4190 * temporary; reattachment or removal should happen within the same drawing cycle as 4191 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4192 * call to {@link #getChildAt(int)}. 4193 * 4194 * @see #detachViewFromParent(View) 4195 * @see #detachViewFromParent(int) 4196 * @see #detachViewsFromParent(int, int) 4197 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4198 * @see #removeDetachedView(View, boolean) 4199 */ 4200 protected void detachAllViewsFromParent() { 4201 final int count = mChildrenCount; 4202 if (count <= 0) { 4203 return; 4204 } 4205 4206 final View[] children = mChildren; 4207 mChildrenCount = 0; 4208 4209 for (int i = count - 1; i >= 0; i--) { 4210 children[i].mParent = null; 4211 children[i] = null; 4212 } 4213 } 4214 4215 /** 4216 * Don't call or override this method. It is used for the implementation of 4217 * the view hierarchy. 4218 */ 4219 public final void invalidateChild(View child, final Rect dirty) { 4220 ViewParent parent = this; 4221 4222 final AttachInfo attachInfo = mAttachInfo; 4223 if (attachInfo != null) { 4224 // If the child is drawing an animation, we want to copy this flag onto 4225 // ourselves and the parent to make sure the invalidate request goes 4226 // through 4227 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4228 == PFLAG_DRAW_ANIMATION; 4229 4230 // Check whether the child that requests the invalidate is fully opaque 4231 // Views being animated or transformed are not considered opaque because we may 4232 // be invalidating their old position and need the parent to paint behind them. 4233 Matrix childMatrix = child.getMatrix(); 4234 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4235 child.getAnimation() == null && childMatrix.isIdentity(); 4236 // Mark the child as dirty, using the appropriate flag 4237 // Make sure we do not set both flags at the same time 4238 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4239 4240 if (child.mLayerType != LAYER_TYPE_NONE) { 4241 mPrivateFlags |= PFLAG_INVALIDATED; 4242 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4243 child.mLocalDirtyRect.union(dirty); 4244 } 4245 4246 final int[] location = attachInfo.mInvalidateChildLocation; 4247 location[CHILD_LEFT_INDEX] = child.mLeft; 4248 location[CHILD_TOP_INDEX] = child.mTop; 4249 if (!childMatrix.isIdentity() || 4250 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4251 RectF boundingRect = attachInfo.mTmpTransformRect; 4252 boundingRect.set(dirty); 4253 Matrix transformMatrix; 4254 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4255 Transformation t = attachInfo.mTmpTransformation; 4256 boolean transformed = getChildStaticTransformation(child, t); 4257 if (transformed) { 4258 transformMatrix = attachInfo.mTmpMatrix; 4259 transformMatrix.set(t.getMatrix()); 4260 if (!childMatrix.isIdentity()) { 4261 transformMatrix.preConcat(childMatrix); 4262 } 4263 } else { 4264 transformMatrix = childMatrix; 4265 } 4266 } else { 4267 transformMatrix = childMatrix; 4268 } 4269 transformMatrix.mapRect(boundingRect); 4270 dirty.set((int) (boundingRect.left - 0.5f), 4271 (int) (boundingRect.top - 0.5f), 4272 (int) (boundingRect.right + 0.5f), 4273 (int) (boundingRect.bottom + 0.5f)); 4274 } 4275 4276 do { 4277 View view = null; 4278 if (parent instanceof View) { 4279 view = (View) parent; 4280 } 4281 4282 if (drawAnimation) { 4283 if (view != null) { 4284 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4285 } else if (parent instanceof ViewRootImpl) { 4286 ((ViewRootImpl) parent).mIsAnimating = true; 4287 } 4288 } 4289 4290 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4291 // flag coming from the child that initiated the invalidate 4292 if (view != null) { 4293 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4294 view.getSolidColor() == 0) { 4295 opaqueFlag = PFLAG_DIRTY; 4296 } 4297 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4298 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4299 } 4300 } 4301 4302 parent = parent.invalidateChildInParent(location, dirty); 4303 if (view != null) { 4304 // Account for transform on current parent 4305 Matrix m = view.getMatrix(); 4306 if (!m.isIdentity()) { 4307 RectF boundingRect = attachInfo.mTmpTransformRect; 4308 boundingRect.set(dirty); 4309 m.mapRect(boundingRect); 4310 dirty.set((int) (boundingRect.left - 0.5f), 4311 (int) (boundingRect.top - 0.5f), 4312 (int) (boundingRect.right + 0.5f), 4313 (int) (boundingRect.bottom + 0.5f)); 4314 } 4315 } 4316 } while (parent != null); 4317 } 4318 } 4319 4320 /** 4321 * Don't call or override this method. It is used for the implementation of 4322 * the view hierarchy. 4323 * 4324 * This implementation returns null if this ViewGroup does not have a parent, 4325 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4326 * does not intersect with this ViewGroup's bounds. 4327 */ 4328 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4329 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4330 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4331 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4332 FLAG_OPTIMIZE_INVALIDATE) { 4333 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4334 location[CHILD_TOP_INDEX] - mScrollY); 4335 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4336 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4337 } 4338 4339 final int left = mLeft; 4340 final int top = mTop; 4341 4342 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4343 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4344 dirty.setEmpty(); 4345 } 4346 } 4347 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4348 4349 location[CHILD_LEFT_INDEX] = left; 4350 location[CHILD_TOP_INDEX] = top; 4351 4352 if (mLayerType != LAYER_TYPE_NONE) { 4353 mPrivateFlags |= PFLAG_INVALIDATED; 4354 mLocalDirtyRect.union(dirty); 4355 } 4356 4357 return mParent; 4358 4359 } else { 4360 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4361 4362 location[CHILD_LEFT_INDEX] = mLeft; 4363 location[CHILD_TOP_INDEX] = mTop; 4364 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4365 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4366 } else { 4367 // in case the dirty rect extends outside the bounds of this container 4368 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4369 } 4370 4371 if (mLayerType != LAYER_TYPE_NONE) { 4372 mPrivateFlags |= PFLAG_INVALIDATED; 4373 mLocalDirtyRect.union(dirty); 4374 } 4375 4376 return mParent; 4377 } 4378 } 4379 4380 return null; 4381 } 4382 4383 /** 4384 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4385 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4386 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4387 * 4388 * @hide 4389 */ 4390 public void invalidateChildFast(View child, final Rect dirty) { 4391 ViewParent parent = this; 4392 4393 final AttachInfo attachInfo = mAttachInfo; 4394 if (attachInfo != null) { 4395 if (child.mLayerType != LAYER_TYPE_NONE) { 4396 child.mLocalDirtyRect.union(dirty); 4397 } 4398 4399 int left = child.mLeft; 4400 int top = child.mTop; 4401 if (!child.getMatrix().isIdentity()) { 4402 child.transformRect(dirty); 4403 } 4404 4405 do { 4406 if (parent instanceof ViewGroup) { 4407 ViewGroup parentVG = (ViewGroup) parent; 4408 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4409 // Layered parents should be recreated, not just re-issued 4410 parentVG.invalidate(); 4411 parent = null; 4412 } else { 4413 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4414 left = parentVG.mLeft; 4415 top = parentVG.mTop; 4416 } 4417 } else { 4418 // Reached the top; this calls into the usual invalidate method in 4419 // ViewRootImpl, which schedules a traversal 4420 final int[] location = attachInfo.mInvalidateChildLocation; 4421 location[0] = left; 4422 location[1] = top; 4423 parent = parent.invalidateChildInParent(location, dirty); 4424 } 4425 } while (parent != null); 4426 } 4427 } 4428 4429 /** 4430 * Quick invalidation method that simply transforms the dirty rect into the parent's 4431 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4432 * 4433 * @hide 4434 */ 4435 protected ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4436 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4437 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4438 dirty.offset(left - mScrollX, top - mScrollY); 4439 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4440 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4441 } 4442 4443 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4444 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4445 4446 if (mLayerType != LAYER_TYPE_NONE) { 4447 mLocalDirtyRect.union(dirty); 4448 } 4449 if (!getMatrix().isIdentity()) { 4450 transformRect(dirty); 4451 } 4452 4453 return mParent; 4454 } 4455 } 4456 4457 return null; 4458 } 4459 4460 /** 4461 * Offset a rectangle that is in a descendant's coordinate 4462 * space into our coordinate space. 4463 * @param descendant A descendant of this view 4464 * @param rect A rectangle defined in descendant's coordinate space. 4465 */ 4466 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4467 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4468 } 4469 4470 /** 4471 * Offset a rectangle that is in our coordinate space into an ancestor's 4472 * coordinate space. 4473 * @param descendant A descendant of this view 4474 * @param rect A rectangle defined in descendant's coordinate space. 4475 */ 4476 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4477 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4478 } 4479 4480 /** 4481 * Helper method that offsets a rect either from parent to descendant or 4482 * descendant to parent. 4483 */ 4484 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4485 boolean offsetFromChildToParent, boolean clipToBounds) { 4486 4487 // already in the same coord system :) 4488 if (descendant == this) { 4489 return; 4490 } 4491 4492 ViewParent theParent = descendant.mParent; 4493 4494 // search and offset up to the parent 4495 while ((theParent != null) 4496 && (theParent instanceof View) 4497 && (theParent != this)) { 4498 4499 if (offsetFromChildToParent) { 4500 rect.offset(descendant.mLeft - descendant.mScrollX, 4501 descendant.mTop - descendant.mScrollY); 4502 if (clipToBounds) { 4503 View p = (View) theParent; 4504 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4505 } 4506 } else { 4507 if (clipToBounds) { 4508 View p = (View) theParent; 4509 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4510 } 4511 rect.offset(descendant.mScrollX - descendant.mLeft, 4512 descendant.mScrollY - descendant.mTop); 4513 } 4514 4515 descendant = (View) theParent; 4516 theParent = descendant.mParent; 4517 } 4518 4519 // now that we are up to this view, need to offset one more time 4520 // to get into our coordinate space 4521 if (theParent == this) { 4522 if (offsetFromChildToParent) { 4523 rect.offset(descendant.mLeft - descendant.mScrollX, 4524 descendant.mTop - descendant.mScrollY); 4525 } else { 4526 rect.offset(descendant.mScrollX - descendant.mLeft, 4527 descendant.mScrollY - descendant.mTop); 4528 } 4529 } else { 4530 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4531 } 4532 } 4533 4534 /** 4535 * Offset the vertical location of all children of this view by the specified number of pixels. 4536 * 4537 * @param offset the number of pixels to offset 4538 * 4539 * @hide 4540 */ 4541 public void offsetChildrenTopAndBottom(int offset) { 4542 final int count = mChildrenCount; 4543 final View[] children = mChildren; 4544 boolean invalidate = false; 4545 4546 for (int i = 0; i < count; i++) { 4547 final View v = children[i]; 4548 v.mTop += offset; 4549 v.mBottom += offset; 4550 if (v.mDisplayList != null) { 4551 invalidate = true; 4552 v.mDisplayList.offsetTopAndBottom(offset); 4553 } 4554 } 4555 4556 if (invalidate) { 4557 invalidateViewProperty(false, false); 4558 } 4559 } 4560 4561 /** 4562 * {@inheritDoc} 4563 */ 4564 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4565 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4566 // but for some simple tests it can be useful. If we don't have attach info this 4567 // will allocate memory. 4568 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4569 rect.set(r); 4570 4571 if (!child.hasIdentityMatrix()) { 4572 child.getMatrix().mapRect(rect); 4573 } 4574 4575 int dx = child.mLeft - mScrollX; 4576 int dy = child.mTop - mScrollY; 4577 4578 rect.offset(dx, dy); 4579 4580 if (offset != null) { 4581 if (!child.hasIdentityMatrix()) { 4582 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4583 : new float[2]; 4584 position[0] = offset.x; 4585 position[1] = offset.y; 4586 child.getMatrix().mapPoints(position); 4587 offset.x = (int) (position[0] + 0.5f); 4588 offset.y = (int) (position[1] + 0.5f); 4589 } 4590 offset.x += dx; 4591 offset.y += dy; 4592 } 4593 4594 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4595 if (mParent == null) return true; 4596 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4597 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4598 return mParent.getChildVisibleRect(this, r, offset); 4599 } 4600 4601 return false; 4602 } 4603 4604 /** 4605 * {@inheritDoc} 4606 */ 4607 @Override 4608 public final void layout(int l, int t, int r, int b) { 4609 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 4610 if (mTransition != null) { 4611 mTransition.layoutChange(this); 4612 } 4613 super.layout(l, t, r, b); 4614 } else { 4615 // record the fact that we noop'd it; request layout when transition finishes 4616 mLayoutCalledWhileSuppressed = true; 4617 } 4618 } 4619 4620 /** 4621 * {@inheritDoc} 4622 */ 4623 @Override 4624 protected abstract void onLayout(boolean changed, 4625 int l, int t, int r, int b); 4626 4627 /** 4628 * Indicates whether the view group has the ability to animate its children 4629 * after the first layout. 4630 * 4631 * @return true if the children can be animated, false otherwise 4632 */ 4633 protected boolean canAnimate() { 4634 return mLayoutAnimationController != null; 4635 } 4636 4637 /** 4638 * Runs the layout animation. Calling this method triggers a relayout of 4639 * this view group. 4640 */ 4641 public void startLayoutAnimation() { 4642 if (mLayoutAnimationController != null) { 4643 mGroupFlags |= FLAG_RUN_ANIMATION; 4644 requestLayout(); 4645 } 4646 } 4647 4648 /** 4649 * Schedules the layout animation to be played after the next layout pass 4650 * of this view group. This can be used to restart the layout animation 4651 * when the content of the view group changes or when the activity is 4652 * paused and resumed. 4653 */ 4654 public void scheduleLayoutAnimation() { 4655 mGroupFlags |= FLAG_RUN_ANIMATION; 4656 } 4657 4658 /** 4659 * Sets the layout animation controller used to animate the group's 4660 * children after the first layout. 4661 * 4662 * @param controller the animation controller 4663 */ 4664 public void setLayoutAnimation(LayoutAnimationController controller) { 4665 mLayoutAnimationController = controller; 4666 if (mLayoutAnimationController != null) { 4667 mGroupFlags |= FLAG_RUN_ANIMATION; 4668 } 4669 } 4670 4671 /** 4672 * Returns the layout animation controller used to animate the group's 4673 * children. 4674 * 4675 * @return the current animation controller 4676 */ 4677 public LayoutAnimationController getLayoutAnimation() { 4678 return mLayoutAnimationController; 4679 } 4680 4681 /** 4682 * Indicates whether the children's drawing cache is used during a layout 4683 * animation. By default, the drawing cache is enabled but this will prevent 4684 * nested layout animations from working. To nest animations, you must disable 4685 * the cache. 4686 * 4687 * @return true if the animation cache is enabled, false otherwise 4688 * 4689 * @see #setAnimationCacheEnabled(boolean) 4690 * @see View#setDrawingCacheEnabled(boolean) 4691 */ 4692 @ViewDebug.ExportedProperty 4693 public boolean isAnimationCacheEnabled() { 4694 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4695 } 4696 4697 /** 4698 * Enables or disables the children's drawing cache during a layout animation. 4699 * By default, the drawing cache is enabled but this will prevent nested 4700 * layout animations from working. To nest animations, you must disable the 4701 * cache. 4702 * 4703 * @param enabled true to enable the animation cache, false otherwise 4704 * 4705 * @see #isAnimationCacheEnabled() 4706 * @see View#setDrawingCacheEnabled(boolean) 4707 */ 4708 public void setAnimationCacheEnabled(boolean enabled) { 4709 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4710 } 4711 4712 /** 4713 * Indicates whether this ViewGroup will always try to draw its children using their 4714 * drawing cache. By default this property is enabled. 4715 * 4716 * @return true if the animation cache is enabled, false otherwise 4717 * 4718 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4719 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4720 * @see View#setDrawingCacheEnabled(boolean) 4721 */ 4722 @ViewDebug.ExportedProperty(category = "drawing") 4723 public boolean isAlwaysDrawnWithCacheEnabled() { 4724 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4725 } 4726 4727 /** 4728 * Indicates whether this ViewGroup will always try to draw its children using their 4729 * drawing cache. This property can be set to true when the cache rendering is 4730 * slightly different from the children's normal rendering. Renderings can be different, 4731 * for instance, when the cache's quality is set to low. 4732 * 4733 * When this property is disabled, the ViewGroup will use the drawing cache of its 4734 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4735 * when to start using the drawing cache and when to stop using it. 4736 * 4737 * @param always true to always draw with the drawing cache, false otherwise 4738 * 4739 * @see #isAlwaysDrawnWithCacheEnabled() 4740 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4741 * @see View#setDrawingCacheEnabled(boolean) 4742 * @see View#setDrawingCacheQuality(int) 4743 */ 4744 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4745 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4746 } 4747 4748 /** 4749 * Indicates whether the ViewGroup is currently drawing its children using 4750 * their drawing cache. 4751 * 4752 * @return true if children should be drawn with their cache, false otherwise 4753 * 4754 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4755 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4756 */ 4757 @ViewDebug.ExportedProperty(category = "drawing") 4758 protected boolean isChildrenDrawnWithCacheEnabled() { 4759 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4760 } 4761 4762 /** 4763 * Tells the ViewGroup to draw its children using their drawing cache. This property 4764 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4765 * will be used only if it has been enabled. 4766 * 4767 * Subclasses should call this method to start and stop using the drawing cache when 4768 * they perform performance sensitive operations, like scrolling or animating. 4769 * 4770 * @param enabled true if children should be drawn with their cache, false otherwise 4771 * 4772 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4773 * @see #isChildrenDrawnWithCacheEnabled() 4774 */ 4775 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4776 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4777 } 4778 4779 /** 4780 * Indicates whether the ViewGroup is drawing its children in the order defined by 4781 * {@link #getChildDrawingOrder(int, int)}. 4782 * 4783 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4784 * false otherwise 4785 * 4786 * @see #setChildrenDrawingOrderEnabled(boolean) 4787 * @see #getChildDrawingOrder(int, int) 4788 */ 4789 @ViewDebug.ExportedProperty(category = "drawing") 4790 protected boolean isChildrenDrawingOrderEnabled() { 4791 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4792 } 4793 4794 /** 4795 * Tells the ViewGroup whether to draw its children in the order defined by the method 4796 * {@link #getChildDrawingOrder(int, int)}. 4797 * 4798 * @param enabled true if the order of the children when drawing is determined by 4799 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4800 * 4801 * @see #isChildrenDrawingOrderEnabled() 4802 * @see #getChildDrawingOrder(int, int) 4803 */ 4804 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4805 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4806 } 4807 4808 private boolean hasBooleanFlag(int flag) { 4809 return (mGroupFlags & flag) == flag; 4810 } 4811 4812 private void setBooleanFlag(int flag, boolean value) { 4813 if (value) { 4814 mGroupFlags |= flag; 4815 } else { 4816 mGroupFlags &= ~flag; 4817 } 4818 } 4819 4820 /** 4821 * Returns an integer indicating what types of drawing caches are kept in memory. 4822 * 4823 * @see #setPersistentDrawingCache(int) 4824 * @see #setAnimationCacheEnabled(boolean) 4825 * 4826 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4827 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4828 * and {@link #PERSISTENT_ALL_CACHES} 4829 */ 4830 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4831 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4832 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4833 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4834 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4835 }) 4836 public int getPersistentDrawingCache() { 4837 return mPersistentDrawingCache; 4838 } 4839 4840 /** 4841 * Indicates what types of drawing caches should be kept in memory after 4842 * they have been created. 4843 * 4844 * @see #getPersistentDrawingCache() 4845 * @see #setAnimationCacheEnabled(boolean) 4846 * 4847 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4848 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4849 * and {@link #PERSISTENT_ALL_CACHES} 4850 */ 4851 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4852 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4853 } 4854 4855 private void setLayoutMode(int layoutMode, boolean explicitly) { 4856 mLayoutMode = layoutMode; 4857 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4858 } 4859 4860 /** 4861 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4862 * descendants that had inherited a different layoutMode from a previous parent. 4863 * Recursion terminates when a descendant's mode is: 4864 * <ul> 4865 * <li>Undefined</li> 4866 * <li>The same as the root node's</li> 4867 * <li>A mode that had been explicitly set</li> 4868 * <ul/> 4869 * The first two clauses are optimizations. 4870 * @param layoutModeOfRoot 4871 */ 4872 @Override 4873 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4874 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4875 mLayoutMode == layoutModeOfRoot || 4876 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4877 return; 4878 } 4879 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4880 4881 // apply recursively 4882 for (int i = 0, N = getChildCount(); i < N; i++) { 4883 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4884 } 4885 } 4886 4887 /** 4888 * Returns the basis of alignment during layout operations on this ViewGroup: 4889 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4890 * <p> 4891 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4892 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4893 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4894 * 4895 * @return the layout mode to use during layout operations 4896 * 4897 * @see #setLayoutMode(int) 4898 */ 4899 public int getLayoutMode() { 4900 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4901 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4902 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4903 setLayoutMode(inheritedLayoutMode, false); 4904 } 4905 return mLayoutMode; 4906 } 4907 4908 /** 4909 * Sets the basis of alignment during the layout of this ViewGroup. 4910 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4911 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4912 * 4913 * @param layoutMode the layout mode to use during layout operations 4914 * 4915 * @see #getLayoutMode() 4916 * @attr ref android.R.styleable#ViewGroup_layoutMode 4917 */ 4918 public void setLayoutMode(int layoutMode) { 4919 if (mLayoutMode != layoutMode) { 4920 invalidateInheritedLayoutMode(layoutMode); 4921 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4922 requestLayout(); 4923 } 4924 } 4925 4926 /** 4927 * Returns a new set of layout parameters based on the supplied attributes set. 4928 * 4929 * @param attrs the attributes to build the layout parameters from 4930 * 4931 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4932 * of its descendants 4933 */ 4934 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4935 return new LayoutParams(getContext(), attrs); 4936 } 4937 4938 /** 4939 * Returns a safe set of layout parameters based on the supplied layout params. 4940 * When a ViewGroup is passed a View whose layout params do not pass the test of 4941 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4942 * is invoked. This method should return a new set of layout params suitable for 4943 * this ViewGroup, possibly by copying the appropriate attributes from the 4944 * specified set of layout params. 4945 * 4946 * @param p The layout parameters to convert into a suitable set of layout parameters 4947 * for this ViewGroup. 4948 * 4949 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4950 * of its descendants 4951 */ 4952 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4953 return p; 4954 } 4955 4956 /** 4957 * Returns a set of default layout parameters. These parameters are requested 4958 * when the View passed to {@link #addView(View)} has no layout parameters 4959 * already set. If null is returned, an exception is thrown from addView. 4960 * 4961 * @return a set of default layout parameters or null 4962 */ 4963 protected LayoutParams generateDefaultLayoutParams() { 4964 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4965 } 4966 4967 /** 4968 * {@inheritDoc} 4969 */ 4970 @Override 4971 protected void debug(int depth) { 4972 super.debug(depth); 4973 String output; 4974 4975 if (mFocused != null) { 4976 output = debugIndent(depth); 4977 output += "mFocused"; 4978 Log.d(VIEW_LOG_TAG, output); 4979 } 4980 if (mChildrenCount != 0) { 4981 output = debugIndent(depth); 4982 output += "{"; 4983 Log.d(VIEW_LOG_TAG, output); 4984 } 4985 int count = mChildrenCount; 4986 for (int i = 0; i < count; i++) { 4987 View child = mChildren[i]; 4988 child.debug(depth + 1); 4989 } 4990 4991 if (mChildrenCount != 0) { 4992 output = debugIndent(depth); 4993 output += "}"; 4994 Log.d(VIEW_LOG_TAG, output); 4995 } 4996 } 4997 4998 /** 4999 * Returns the position in the group of the specified child view. 5000 * 5001 * @param child the view for which to get the position 5002 * @return a positive integer representing the position of the view in the 5003 * group, or -1 if the view does not exist in the group 5004 */ 5005 public int indexOfChild(View child) { 5006 final int count = mChildrenCount; 5007 final View[] children = mChildren; 5008 for (int i = 0; i < count; i++) { 5009 if (children[i] == child) { 5010 return i; 5011 } 5012 } 5013 return -1; 5014 } 5015 5016 /** 5017 * Returns the number of children in the group. 5018 * 5019 * @return a positive integer representing the number of children in 5020 * the group 5021 */ 5022 public int getChildCount() { 5023 return mChildrenCount; 5024 } 5025 5026 /** 5027 * Returns the view at the specified position in the group. 5028 * 5029 * @param index the position at which to get the view from 5030 * @return the view at the specified position or null if the position 5031 * does not exist within the group 5032 */ 5033 public View getChildAt(int index) { 5034 if (index < 0 || index >= mChildrenCount) { 5035 return null; 5036 } 5037 return mChildren[index]; 5038 } 5039 5040 /** 5041 * Ask all of the children of this view to measure themselves, taking into 5042 * account both the MeasureSpec requirements for this view and its padding. 5043 * We skip children that are in the GONE state The heavy lifting is done in 5044 * getChildMeasureSpec. 5045 * 5046 * @param widthMeasureSpec The width requirements for this view 5047 * @param heightMeasureSpec The height requirements for this view 5048 */ 5049 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5050 final int size = mChildrenCount; 5051 final View[] children = mChildren; 5052 for (int i = 0; i < size; ++i) { 5053 final View child = children[i]; 5054 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5055 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5056 } 5057 } 5058 } 5059 5060 /** 5061 * Ask one of the children of this view to measure itself, taking into 5062 * account both the MeasureSpec requirements for this view and its padding. 5063 * The heavy lifting is done in getChildMeasureSpec. 5064 * 5065 * @param child The child to measure 5066 * @param parentWidthMeasureSpec The width requirements for this view 5067 * @param parentHeightMeasureSpec The height requirements for this view 5068 */ 5069 protected void measureChild(View child, int parentWidthMeasureSpec, 5070 int parentHeightMeasureSpec) { 5071 final LayoutParams lp = child.getLayoutParams(); 5072 5073 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5074 mPaddingLeft + mPaddingRight, lp.width); 5075 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5076 mPaddingTop + mPaddingBottom, lp.height); 5077 5078 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5079 } 5080 5081 /** 5082 * Ask one of the children of this view to measure itself, taking into 5083 * account both the MeasureSpec requirements for this view and its padding 5084 * and margins. The child must have MarginLayoutParams The heavy lifting is 5085 * done in getChildMeasureSpec. 5086 * 5087 * @param child The child to measure 5088 * @param parentWidthMeasureSpec The width requirements for this view 5089 * @param widthUsed Extra space that has been used up by the parent 5090 * horizontally (possibly by other children of the parent) 5091 * @param parentHeightMeasureSpec The height requirements for this view 5092 * @param heightUsed Extra space that has been used up by the parent 5093 * vertically (possibly by other children of the parent) 5094 */ 5095 protected void measureChildWithMargins(View child, 5096 int parentWidthMeasureSpec, int widthUsed, 5097 int parentHeightMeasureSpec, int heightUsed) { 5098 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5099 5100 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5101 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5102 + widthUsed, lp.width); 5103 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5104 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5105 + heightUsed, lp.height); 5106 5107 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5108 } 5109 5110 /** 5111 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5112 * pass to a particular child. This method figures out the right MeasureSpec 5113 * for one dimension (height or width) of one child view. 5114 * 5115 * The goal is to combine information from our MeasureSpec with the 5116 * LayoutParams of the child to get the best possible results. For example, 5117 * if the this view knows its size (because its MeasureSpec has a mode of 5118 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5119 * to be the same size as the parent, the parent should ask the child to 5120 * layout given an exact size. 5121 * 5122 * @param spec The requirements for this view 5123 * @param padding The padding of this view for the current dimension and 5124 * margins, if applicable 5125 * @param childDimension How big the child wants to be in the current 5126 * dimension 5127 * @return a MeasureSpec integer for the child 5128 */ 5129 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5130 int specMode = MeasureSpec.getMode(spec); 5131 int specSize = MeasureSpec.getSize(spec); 5132 5133 int size = Math.max(0, specSize - padding); 5134 5135 int resultSize = 0; 5136 int resultMode = 0; 5137 5138 switch (specMode) { 5139 // Parent has imposed an exact size on us 5140 case MeasureSpec.EXACTLY: 5141 if (childDimension >= 0) { 5142 resultSize = childDimension; 5143 resultMode = MeasureSpec.EXACTLY; 5144 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5145 // Child wants to be our size. So be it. 5146 resultSize = size; 5147 resultMode = MeasureSpec.EXACTLY; 5148 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5149 // Child wants to determine its own size. It can't be 5150 // bigger than us. 5151 resultSize = size; 5152 resultMode = MeasureSpec.AT_MOST; 5153 } 5154 break; 5155 5156 // Parent has imposed a maximum size on us 5157 case MeasureSpec.AT_MOST: 5158 if (childDimension >= 0) { 5159 // Child wants a specific size... so be it 5160 resultSize = childDimension; 5161 resultMode = MeasureSpec.EXACTLY; 5162 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5163 // Child wants to be our size, but our size is not fixed. 5164 // Constrain child to not be bigger than us. 5165 resultSize = size; 5166 resultMode = MeasureSpec.AT_MOST; 5167 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5168 // Child wants to determine its own size. It can't be 5169 // bigger than us. 5170 resultSize = size; 5171 resultMode = MeasureSpec.AT_MOST; 5172 } 5173 break; 5174 5175 // Parent asked to see how big we want to be 5176 case MeasureSpec.UNSPECIFIED: 5177 if (childDimension >= 0) { 5178 // Child wants a specific size... let him have it 5179 resultSize = childDimension; 5180 resultMode = MeasureSpec.EXACTLY; 5181 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5182 // Child wants to be our size... find out how big it should 5183 // be 5184 resultSize = 0; 5185 resultMode = MeasureSpec.UNSPECIFIED; 5186 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5187 // Child wants to determine its own size.... find out how 5188 // big it should be 5189 resultSize = 0; 5190 resultMode = MeasureSpec.UNSPECIFIED; 5191 } 5192 break; 5193 } 5194 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5195 } 5196 5197 5198 /** 5199 * Removes any pending animations for views that have been removed. Call 5200 * this if you don't want animations for exiting views to stack up. 5201 */ 5202 public void clearDisappearingChildren() { 5203 if (mDisappearingChildren != null) { 5204 mDisappearingChildren.clear(); 5205 invalidate(); 5206 } 5207 } 5208 5209 /** 5210 * Add a view which is removed from mChildren but still needs animation 5211 * 5212 * @param v View to add 5213 */ 5214 private void addDisappearingView(View v) { 5215 ArrayList<View> disappearingChildren = mDisappearingChildren; 5216 5217 if (disappearingChildren == null) { 5218 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5219 } 5220 5221 disappearingChildren.add(v); 5222 } 5223 5224 /** 5225 * Cleanup a view when its animation is done. This may mean removing it from 5226 * the list of disappearing views. 5227 * 5228 * @param view The view whose animation has finished 5229 * @param animation The animation, cannot be null 5230 */ 5231 void finishAnimatingView(final View view, Animation animation) { 5232 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5233 if (disappearingChildren != null) { 5234 if (disappearingChildren.contains(view)) { 5235 disappearingChildren.remove(view); 5236 5237 if (view.mAttachInfo != null) { 5238 view.dispatchDetachedFromWindow(); 5239 } 5240 5241 view.clearAnimation(); 5242 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5243 } 5244 } 5245 5246 if (animation != null && !animation.getFillAfter()) { 5247 view.clearAnimation(); 5248 } 5249 5250 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5251 view.onAnimationEnd(); 5252 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5253 // so we'd rather be safe than sorry 5254 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5255 // Draw one more frame after the animation is done 5256 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5257 } 5258 } 5259 5260 /** 5261 * Utility function called by View during invalidation to determine whether a view that 5262 * is invisible or gone should still be invalidated because it is being transitioned (and 5263 * therefore still needs to be drawn). 5264 */ 5265 boolean isViewTransitioning(View view) { 5266 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5267 } 5268 5269 /** 5270 * This method tells the ViewGroup that the given View object, which should have this 5271 * ViewGroup as its parent, 5272 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5273 * is removed from its parent. This allows animations, such as those used by 5274 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5275 * the removal of views. A call to this method should always be accompanied by a later call 5276 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5277 * so that the View finally gets removed. 5278 * 5279 * @param view The View object to be kept visible even if it gets removed from its parent. 5280 */ 5281 public void startViewTransition(View view) { 5282 if (view.mParent == this) { 5283 if (mTransitioningViews == null) { 5284 mTransitioningViews = new ArrayList<View>(); 5285 } 5286 mTransitioningViews.add(view); 5287 } 5288 } 5289 5290 /** 5291 * This method should always be called following an earlier call to 5292 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5293 * and will no longer be displayed. Note that this method does not perform the functionality 5294 * of removing a view from its parent; it just discontinues the display of a View that 5295 * has previously been removed. 5296 * 5297 * @return view The View object that has been removed but is being kept around in the visible 5298 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5299 */ 5300 public void endViewTransition(View view) { 5301 if (mTransitioningViews != null) { 5302 mTransitioningViews.remove(view); 5303 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5304 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5305 disappearingChildren.remove(view); 5306 if (mVisibilityChangingChildren != null && 5307 mVisibilityChangingChildren.contains(view)) { 5308 mVisibilityChangingChildren.remove(view); 5309 } else { 5310 if (view.mAttachInfo != null) { 5311 view.dispatchDetachedFromWindow(); 5312 } 5313 if (view.mParent != null) { 5314 view.mParent = null; 5315 } 5316 } 5317 invalidate(); 5318 } 5319 } 5320 } 5321 5322 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5323 new LayoutTransition.TransitionListener() { 5324 @Override 5325 public void startTransition(LayoutTransition transition, ViewGroup container, 5326 View view, int transitionType) { 5327 // We only care about disappearing items, since we need special logic to keep 5328 // those items visible after they've been 'removed' 5329 if (transitionType == LayoutTransition.DISAPPEARING) { 5330 startViewTransition(view); 5331 } 5332 } 5333 5334 @Override 5335 public void endTransition(LayoutTransition transition, ViewGroup container, 5336 View view, int transitionType) { 5337 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5338 requestLayout(); 5339 mLayoutCalledWhileSuppressed = false; 5340 } 5341 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5342 endViewTransition(view); 5343 } 5344 } 5345 }; 5346 5347 /** 5348 * Tells this ViewGroup to suppress all layout() calls until layout 5349 * suppression is disabled with a later call to suppressLayout(false). 5350 * When layout suppression is disabled, a requestLayout() call is sent 5351 * if layout() was attempted while layout was being suppressed. 5352 * 5353 * @hide 5354 */ 5355 public void suppressLayout(boolean suppress) { 5356 mSuppressLayout = suppress; 5357 if (!suppress) { 5358 if (mLayoutCalledWhileSuppressed) { 5359 requestLayout(); 5360 mLayoutCalledWhileSuppressed = false; 5361 } 5362 } 5363 } 5364 5365 /** 5366 * Returns whether layout calls on this container are currently being 5367 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 5368 * 5369 * @return true if layout calls are currently suppressed, false otherwise. 5370 * 5371 * @hide 5372 */ 5373 public boolean isLayoutSuppressed() { 5374 return mSuppressLayout; 5375 } 5376 5377 /** 5378 * {@inheritDoc} 5379 */ 5380 @Override 5381 public boolean gatherTransparentRegion(Region region) { 5382 // If no transparent regions requested, we are always opaque. 5383 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5384 if (meOpaque && region == null) { 5385 // The caller doesn't care about the region, so stop now. 5386 return true; 5387 } 5388 super.gatherTransparentRegion(region); 5389 final View[] children = mChildren; 5390 final int count = mChildrenCount; 5391 boolean noneOfTheChildrenAreTransparent = true; 5392 for (int i = 0; i < count; i++) { 5393 final View child = children[i]; 5394 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5395 if (!child.gatherTransparentRegion(region)) { 5396 noneOfTheChildrenAreTransparent = false; 5397 } 5398 } 5399 } 5400 return meOpaque || noneOfTheChildrenAreTransparent; 5401 } 5402 5403 /** 5404 * {@inheritDoc} 5405 */ 5406 public void requestTransparentRegion(View child) { 5407 if (child != null) { 5408 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5409 if (mParent != null) { 5410 mParent.requestTransparentRegion(this); 5411 } 5412 } 5413 } 5414 5415 5416 @Override 5417 protected boolean fitSystemWindows(Rect insets) { 5418 boolean done = super.fitSystemWindows(insets); 5419 if (!done) { 5420 final int count = mChildrenCount; 5421 final View[] children = mChildren; 5422 for (int i = 0; i < count; i++) { 5423 done = children[i].fitSystemWindows(insets); 5424 if (done) { 5425 break; 5426 } 5427 } 5428 } 5429 return done; 5430 } 5431 5432 /** 5433 * Returns the animation listener to which layout animation events are 5434 * sent. 5435 * 5436 * @return an {@link android.view.animation.Animation.AnimationListener} 5437 */ 5438 public Animation.AnimationListener getLayoutAnimationListener() { 5439 return mAnimationListener; 5440 } 5441 5442 @Override 5443 protected void drawableStateChanged() { 5444 super.drawableStateChanged(); 5445 5446 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5447 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5448 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5449 + " child has duplicateParentState set to true"); 5450 } 5451 5452 final View[] children = mChildren; 5453 final int count = mChildrenCount; 5454 5455 for (int i = 0; i < count; i++) { 5456 final View child = children[i]; 5457 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5458 child.refreshDrawableState(); 5459 } 5460 } 5461 } 5462 } 5463 5464 @Override 5465 public void jumpDrawablesToCurrentState() { 5466 super.jumpDrawablesToCurrentState(); 5467 final View[] children = mChildren; 5468 final int count = mChildrenCount; 5469 for (int i = 0; i < count; i++) { 5470 children[i].jumpDrawablesToCurrentState(); 5471 } 5472 } 5473 5474 @Override 5475 protected int[] onCreateDrawableState(int extraSpace) { 5476 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5477 return super.onCreateDrawableState(extraSpace); 5478 } 5479 5480 int need = 0; 5481 int n = getChildCount(); 5482 for (int i = 0; i < n; i++) { 5483 int[] childState = getChildAt(i).getDrawableState(); 5484 5485 if (childState != null) { 5486 need += childState.length; 5487 } 5488 } 5489 5490 int[] state = super.onCreateDrawableState(extraSpace + need); 5491 5492 for (int i = 0; i < n; i++) { 5493 int[] childState = getChildAt(i).getDrawableState(); 5494 5495 if (childState != null) { 5496 state = mergeDrawableStates(state, childState); 5497 } 5498 } 5499 5500 return state; 5501 } 5502 5503 /** 5504 * Sets whether this ViewGroup's drawable states also include 5505 * its children's drawable states. This is used, for example, to 5506 * make a group appear to be focused when its child EditText or button 5507 * is focused. 5508 */ 5509 public void setAddStatesFromChildren(boolean addsStates) { 5510 if (addsStates) { 5511 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5512 } else { 5513 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5514 } 5515 5516 refreshDrawableState(); 5517 } 5518 5519 /** 5520 * Returns whether this ViewGroup's drawable states also include 5521 * its children's drawable states. This is used, for example, to 5522 * make a group appear to be focused when its child EditText or button 5523 * is focused. 5524 */ 5525 public boolean addStatesFromChildren() { 5526 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5527 } 5528 5529 /** 5530 * If {@link #addStatesFromChildren} is true, refreshes this group's 5531 * drawable state (to include the states from its children). 5532 */ 5533 public void childDrawableStateChanged(View child) { 5534 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5535 refreshDrawableState(); 5536 } 5537 } 5538 5539 /** 5540 * Specifies the animation listener to which layout animation events must 5541 * be sent. Only 5542 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5543 * and 5544 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5545 * are invoked. 5546 * 5547 * @param animationListener the layout animation listener 5548 */ 5549 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5550 mAnimationListener = animationListener; 5551 } 5552 5553 /** 5554 * This method is called by LayoutTransition when there are 'changing' animations that need 5555 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5556 * starts all pending transitions prior to the drawing phase in the current traversal. 5557 * 5558 * @param transition The LayoutTransition to be started on the next traversal. 5559 * 5560 * @hide 5561 */ 5562 public void requestTransitionStart(LayoutTransition transition) { 5563 ViewRootImpl viewAncestor = getViewRootImpl(); 5564 if (viewAncestor != null) { 5565 viewAncestor.requestTransitionStart(transition); 5566 } 5567 } 5568 5569 /** 5570 * @hide 5571 */ 5572 @Override 5573 public boolean resolveRtlPropertiesIfNeeded() { 5574 final boolean result = super.resolveRtlPropertiesIfNeeded(); 5575 // We dont need to resolve the children RTL properties if nothing has changed for the parent 5576 if (result) { 5577 int count = getChildCount(); 5578 for (int i = 0; i < count; i++) { 5579 final View child = getChildAt(i); 5580 if (child.isLayoutDirectionInherited()) { 5581 child.resolveRtlPropertiesIfNeeded(); 5582 } 5583 } 5584 } 5585 return result; 5586 } 5587 5588 /** 5589 * @hide 5590 */ 5591 @Override 5592 public boolean resolveLayoutDirection() { 5593 final boolean result = super.resolveLayoutDirection(); 5594 if (result) { 5595 int count = getChildCount(); 5596 for (int i = 0; i < count; i++) { 5597 final View child = getChildAt(i); 5598 if (child.isLayoutDirectionInherited()) { 5599 child.resolveLayoutDirection(); 5600 } 5601 } 5602 } 5603 return result; 5604 } 5605 5606 /** 5607 * @hide 5608 */ 5609 @Override 5610 public boolean resolveTextDirection() { 5611 final boolean result = super.resolveTextDirection(); 5612 if (result) { 5613 int count = getChildCount(); 5614 for (int i = 0; i < count; i++) { 5615 final View child = getChildAt(i); 5616 if (child.isTextDirectionInherited()) { 5617 child.resolveTextDirection(); 5618 } 5619 } 5620 } 5621 return result; 5622 } 5623 5624 /** 5625 * @hide 5626 */ 5627 @Override 5628 public boolean resolveTextAlignment() { 5629 final boolean result = super.resolveTextAlignment(); 5630 if (result) { 5631 int count = getChildCount(); 5632 for (int i = 0; i < count; i++) { 5633 final View child = getChildAt(i); 5634 if (child.isTextAlignmentInherited()) { 5635 child.resolveTextAlignment(); 5636 } 5637 } 5638 } 5639 return result; 5640 } 5641 5642 /** 5643 * @hide 5644 */ 5645 @Override 5646 public void resolvePadding() { 5647 super.resolvePadding(); 5648 int count = getChildCount(); 5649 for (int i = 0; i < count; i++) { 5650 final View child = getChildAt(i); 5651 if (child.isLayoutDirectionInherited()) { 5652 child.resolvePadding(); 5653 } 5654 } 5655 } 5656 5657 /** 5658 * @hide 5659 */ 5660 @Override 5661 protected void resolveDrawables() { 5662 super.resolveDrawables(); 5663 int count = getChildCount(); 5664 for (int i = 0; i < count; i++) { 5665 final View child = getChildAt(i); 5666 if (child.isLayoutDirectionInherited()) { 5667 child.resolveDrawables(); 5668 } 5669 } 5670 } 5671 5672 /** 5673 * @hide 5674 */ 5675 @Override 5676 public void resolveLayoutParams() { 5677 super.resolveLayoutParams(); 5678 int count = getChildCount(); 5679 for (int i = 0; i < count; i++) { 5680 final View child = getChildAt(i); 5681 child.resolveLayoutParams(); 5682 } 5683 } 5684 5685 /** 5686 * @hide 5687 */ 5688 @Override 5689 public void resetResolvedLayoutDirection() { 5690 super.resetResolvedLayoutDirection(); 5691 5692 int count = getChildCount(); 5693 for (int i = 0; i < count; i++) { 5694 final View child = getChildAt(i); 5695 if (child.isLayoutDirectionInherited()) { 5696 child.resetResolvedLayoutDirection(); 5697 } 5698 } 5699 } 5700 5701 /** 5702 * @hide 5703 */ 5704 @Override 5705 public void resetResolvedTextDirection() { 5706 super.resetResolvedTextDirection(); 5707 5708 int count = getChildCount(); 5709 for (int i = 0; i < count; i++) { 5710 final View child = getChildAt(i); 5711 if (child.isTextDirectionInherited()) { 5712 child.resetResolvedTextDirection(); 5713 } 5714 } 5715 } 5716 5717 /** 5718 * @hide 5719 */ 5720 @Override 5721 public void resetResolvedTextAlignment() { 5722 super.resetResolvedTextAlignment(); 5723 5724 int count = getChildCount(); 5725 for (int i = 0; i < count; i++) { 5726 final View child = getChildAt(i); 5727 if (child.isTextAlignmentInherited()) { 5728 child.resetResolvedTextAlignment(); 5729 } 5730 } 5731 } 5732 5733 /** 5734 * @hide 5735 */ 5736 @Override 5737 public void resetResolvedPadding() { 5738 super.resetResolvedPadding(); 5739 5740 int count = getChildCount(); 5741 for (int i = 0; i < count; i++) { 5742 final View child = getChildAt(i); 5743 if (child.isLayoutDirectionInherited()) { 5744 child.resetResolvedPadding(); 5745 } 5746 } 5747 } 5748 5749 /** 5750 * @hide 5751 */ 5752 @Override 5753 protected void resetResolvedDrawables() { 5754 super.resetResolvedDrawables(); 5755 5756 int count = getChildCount(); 5757 for (int i = 0; i < count; i++) { 5758 final View child = getChildAt(i); 5759 if (child.isLayoutDirectionInherited()) { 5760 child.resetResolvedDrawables(); 5761 } 5762 } 5763 } 5764 5765 /** 5766 * Return true if the pressed state should be delayed for children or descendants of this 5767 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5768 * This prevents the pressed state from appearing when the user is actually trying to scroll 5769 * the content. 5770 * 5771 * The default implementation returns true for compatibility reasons. Subclasses that do 5772 * not scroll should generally override this method and return false. 5773 */ 5774 public boolean shouldDelayChildPressedState() { 5775 return true; 5776 } 5777 5778 /** @hide */ 5779 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5780 } 5781 5782 /** 5783 * LayoutParams are used by views to tell their parents how they want to be 5784 * laid out. See 5785 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5786 * for a list of all child view attributes that this class supports. 5787 * 5788 * <p> 5789 * The base LayoutParams class just describes how big the view wants to be 5790 * for both width and height. For each dimension, it can specify one of: 5791 * <ul> 5792 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5793 * means that the view wants to be as big as its parent (minus padding) 5794 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5795 * to enclose its content (plus padding) 5796 * <li> an exact number 5797 * </ul> 5798 * There are subclasses of LayoutParams for different subclasses of 5799 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5800 * LayoutParams which adds an X and Y value.</p> 5801 * 5802 * <div class="special reference"> 5803 * <h3>Developer Guides</h3> 5804 * <p>For more information about creating user interface layouts, read the 5805 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5806 * guide.</p></div> 5807 * 5808 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5809 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5810 */ 5811 public static class LayoutParams { 5812 /** 5813 * Special value for the height or width requested by a View. 5814 * FILL_PARENT means that the view wants to be as big as its parent, 5815 * minus the parent's padding, if any. This value is deprecated 5816 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5817 */ 5818 @SuppressWarnings({"UnusedDeclaration"}) 5819 @Deprecated 5820 public static final int FILL_PARENT = -1; 5821 5822 /** 5823 * Special value for the height or width requested by a View. 5824 * MATCH_PARENT means that the view wants to be as big as its parent, 5825 * minus the parent's padding, if any. Introduced in API Level 8. 5826 */ 5827 public static final int MATCH_PARENT = -1; 5828 5829 /** 5830 * Special value for the height or width requested by a View. 5831 * WRAP_CONTENT means that the view wants to be just large enough to fit 5832 * its own internal content, taking its own padding into account. 5833 */ 5834 public static final int WRAP_CONTENT = -2; 5835 5836 /** 5837 * Information about how wide the view wants to be. Can be one of the 5838 * constants FILL_PARENT (replaced by MATCH_PARENT , 5839 * in API Level 8) or WRAP_CONTENT. or an exact size. 5840 */ 5841 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5842 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5843 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5844 }) 5845 public int width; 5846 5847 /** 5848 * Information about how tall the view wants to be. Can be one of the 5849 * constants FILL_PARENT (replaced by MATCH_PARENT , 5850 * in API Level 8) or WRAP_CONTENT. or an exact size. 5851 */ 5852 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5853 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5854 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5855 }) 5856 public int height; 5857 5858 /** 5859 * Used to animate layouts. 5860 */ 5861 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5862 5863 /** 5864 * Creates a new set of layout parameters. The values are extracted from 5865 * the supplied attributes set and context. The XML attributes mapped 5866 * to this set of layout parameters are: 5867 * 5868 * <ul> 5869 * <li><code>layout_width</code>: the width, either an exact value, 5870 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5871 * {@link #MATCH_PARENT} in API Level 8)</li> 5872 * <li><code>layout_height</code>: the height, either an exact value, 5873 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5874 * {@link #MATCH_PARENT} in API Level 8)</li> 5875 * </ul> 5876 * 5877 * @param c the application environment 5878 * @param attrs the set of attributes from which to extract the layout 5879 * parameters' values 5880 */ 5881 public LayoutParams(Context c, AttributeSet attrs) { 5882 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5883 setBaseAttributes(a, 5884 R.styleable.ViewGroup_Layout_layout_width, 5885 R.styleable.ViewGroup_Layout_layout_height); 5886 a.recycle(); 5887 } 5888 5889 /** 5890 * Creates a new set of layout parameters with the specified width 5891 * and height. 5892 * 5893 * @param width the width, either {@link #WRAP_CONTENT}, 5894 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5895 * API Level 8), or a fixed size in pixels 5896 * @param height the height, either {@link #WRAP_CONTENT}, 5897 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5898 * API Level 8), or a fixed size in pixels 5899 */ 5900 public LayoutParams(int width, int height) { 5901 this.width = width; 5902 this.height = height; 5903 } 5904 5905 /** 5906 * Copy constructor. Clones the width and height values of the source. 5907 * 5908 * @param source The layout params to copy from. 5909 */ 5910 public LayoutParams(LayoutParams source) { 5911 this.width = source.width; 5912 this.height = source.height; 5913 } 5914 5915 /** 5916 * Used internally by MarginLayoutParams. 5917 * @hide 5918 */ 5919 LayoutParams() { 5920 } 5921 5922 /** 5923 * Extracts the layout parameters from the supplied attributes. 5924 * 5925 * @param a the style attributes to extract the parameters from 5926 * @param widthAttr the identifier of the width attribute 5927 * @param heightAttr the identifier of the height attribute 5928 */ 5929 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5930 width = a.getLayoutDimension(widthAttr, "layout_width"); 5931 height = a.getLayoutDimension(heightAttr, "layout_height"); 5932 } 5933 5934 /** 5935 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5936 * layoutDirection changes should override this method. The default implementation does 5937 * nothing. 5938 * 5939 * @param layoutDirection the direction of the layout 5940 * 5941 * {@link View#LAYOUT_DIRECTION_LTR} 5942 * {@link View#LAYOUT_DIRECTION_RTL} 5943 */ 5944 public void resolveLayoutDirection(int layoutDirection) { 5945 } 5946 5947 /** 5948 * Returns a String representation of this set of layout parameters. 5949 * 5950 * @param output the String to prepend to the internal representation 5951 * @return a String with the following format: output + 5952 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5953 * 5954 * @hide 5955 */ 5956 public String debug(String output) { 5957 return output + "ViewGroup.LayoutParams={ width=" 5958 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5959 } 5960 5961 /** 5962 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5963 * 5964 * @param view the view that contains these layout parameters 5965 * @param canvas the canvas on which to draw 5966 * 5967 * @hide 5968 */ 5969 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5970 } 5971 5972 /** 5973 * Converts the specified size to a readable String. 5974 * 5975 * @param size the size to convert 5976 * @return a String instance representing the supplied size 5977 * 5978 * @hide 5979 */ 5980 protected static String sizeToString(int size) { 5981 if (size == WRAP_CONTENT) { 5982 return "wrap-content"; 5983 } 5984 if (size == MATCH_PARENT) { 5985 return "match-parent"; 5986 } 5987 return String.valueOf(size); 5988 } 5989 } 5990 5991 /** 5992 * Per-child layout information for layouts that support margins. 5993 * See 5994 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5995 * for a list of all child view attributes that this class supports. 5996 */ 5997 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5998 /** 5999 * The left margin in pixels of the child. 6000 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6001 * to this field. 6002 */ 6003 @ViewDebug.ExportedProperty(category = "layout") 6004 public int leftMargin; 6005 6006 /** 6007 * The top margin in pixels of the child. 6008 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6009 * to this field. 6010 */ 6011 @ViewDebug.ExportedProperty(category = "layout") 6012 public int topMargin; 6013 6014 /** 6015 * The right margin in pixels of the child. 6016 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6017 * to this field. 6018 */ 6019 @ViewDebug.ExportedProperty(category = "layout") 6020 public int rightMargin; 6021 6022 /** 6023 * The bottom margin in pixels of the child. 6024 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6025 * to this field. 6026 */ 6027 @ViewDebug.ExportedProperty(category = "layout") 6028 public int bottomMargin; 6029 6030 /** 6031 * The start margin in pixels of the child. 6032 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6033 * to this field. 6034 */ 6035 @ViewDebug.ExportedProperty(category = "layout") 6036 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6037 6038 /** 6039 * The end margin in pixels of the child. 6040 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6041 * to this field. 6042 */ 6043 @ViewDebug.ExportedProperty(category = "layout") 6044 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6045 6046 /** 6047 * The default start and end margin. 6048 * @hide 6049 */ 6050 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6051 6052 /** 6053 * Bit 0: layout direction 6054 * Bit 1: layout direction 6055 * Bit 2: left margin undefined 6056 * Bit 3: right margin undefined 6057 * Bit 4: is RTL compatibility mode 6058 * Bit 5: need resolution 6059 * 6060 * Bit 6 to 7 not used 6061 * 6062 * @hide 6063 */ 6064 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6065 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6066 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6067 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6068 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6069 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6070 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6071 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6072 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6073 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6074 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6075 }) 6076 byte mMarginFlags; 6077 6078 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6079 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6080 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6081 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6082 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6083 6084 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6085 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6086 6087 /** 6088 * Creates a new set of layout parameters. The values are extracted from 6089 * the supplied attributes set and context. 6090 * 6091 * @param c the application environment 6092 * @param attrs the set of attributes from which to extract the layout 6093 * parameters' values 6094 */ 6095 public MarginLayoutParams(Context c, AttributeSet attrs) { 6096 super(); 6097 6098 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6099 setBaseAttributes(a, 6100 R.styleable.ViewGroup_MarginLayout_layout_width, 6101 R.styleable.ViewGroup_MarginLayout_layout_height); 6102 6103 int margin = a.getDimensionPixelSize( 6104 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6105 if (margin >= 0) { 6106 leftMargin = margin; 6107 topMargin = margin; 6108 rightMargin= margin; 6109 bottomMargin = margin; 6110 } else { 6111 leftMargin = a.getDimensionPixelSize( 6112 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6113 UNDEFINED_MARGIN); 6114 if (leftMargin == UNDEFINED_MARGIN) { 6115 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6116 leftMargin = DEFAULT_MARGIN_RESOLVED; 6117 } 6118 rightMargin = a.getDimensionPixelSize( 6119 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6120 UNDEFINED_MARGIN); 6121 if (rightMargin == UNDEFINED_MARGIN) { 6122 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6123 rightMargin = DEFAULT_MARGIN_RESOLVED; 6124 } 6125 6126 topMargin = a.getDimensionPixelSize( 6127 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6128 DEFAULT_MARGIN_RESOLVED); 6129 bottomMargin = a.getDimensionPixelSize( 6130 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6131 DEFAULT_MARGIN_RESOLVED); 6132 6133 startMargin = a.getDimensionPixelSize( 6134 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6135 DEFAULT_MARGIN_RELATIVE); 6136 endMargin = a.getDimensionPixelSize( 6137 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6138 DEFAULT_MARGIN_RELATIVE); 6139 6140 if (isMarginRelative()) { 6141 mMarginFlags |= NEED_RESOLUTION_MASK; 6142 } 6143 } 6144 6145 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6146 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6147 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6148 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6149 } 6150 6151 // Layout direction is LTR by default 6152 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6153 6154 a.recycle(); 6155 } 6156 6157 /** 6158 * {@inheritDoc} 6159 */ 6160 public MarginLayoutParams(int width, int height) { 6161 super(width, height); 6162 6163 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6164 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6165 6166 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6167 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6168 } 6169 6170 /** 6171 * Copy constructor. Clones the width, height and margin values of the source. 6172 * 6173 * @param source The layout params to copy from. 6174 */ 6175 public MarginLayoutParams(MarginLayoutParams source) { 6176 this.width = source.width; 6177 this.height = source.height; 6178 6179 this.leftMargin = source.leftMargin; 6180 this.topMargin = source.topMargin; 6181 this.rightMargin = source.rightMargin; 6182 this.bottomMargin = source.bottomMargin; 6183 this.startMargin = source.startMargin; 6184 this.endMargin = source.endMargin; 6185 6186 this.mMarginFlags = source.mMarginFlags; 6187 } 6188 6189 /** 6190 * {@inheritDoc} 6191 */ 6192 public MarginLayoutParams(LayoutParams source) { 6193 super(source); 6194 6195 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6196 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6197 6198 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6199 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6200 } 6201 6202 /** 6203 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6204 * to be done so that the new margins are taken into account. Left and right margins may be 6205 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6206 * 6207 * @param left the left margin size 6208 * @param top the top margin size 6209 * @param right the right margin size 6210 * @param bottom the bottom margin size 6211 * 6212 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6213 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6214 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6215 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6216 */ 6217 public void setMargins(int left, int top, int right, int bottom) { 6218 leftMargin = left; 6219 topMargin = top; 6220 rightMargin = right; 6221 bottomMargin = bottom; 6222 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6223 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6224 if (isMarginRelative()) { 6225 mMarginFlags |= NEED_RESOLUTION_MASK; 6226 } else { 6227 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6228 } 6229 } 6230 6231 /** 6232 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6233 * needs to be done so that the new relative margins are taken into account. Left and right 6234 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6235 * direction. 6236 * 6237 * @param start the start margin size 6238 * @param top the top margin size 6239 * @param end the right margin size 6240 * @param bottom the bottom margin size 6241 * 6242 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6243 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6244 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6245 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6246 * 6247 * @hide 6248 */ 6249 public void setMarginsRelative(int start, int top, int end, int bottom) { 6250 startMargin = start; 6251 topMargin = top; 6252 endMargin = end; 6253 bottomMargin = bottom; 6254 mMarginFlags |= NEED_RESOLUTION_MASK; 6255 } 6256 6257 /** 6258 * Sets the relative start margin. 6259 * 6260 * @param start the start margin size 6261 * 6262 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6263 */ 6264 public void setMarginStart(int start) { 6265 startMargin = start; 6266 mMarginFlags |= NEED_RESOLUTION_MASK; 6267 } 6268 6269 /** 6270 * Returns the start margin in pixels. 6271 * 6272 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6273 * 6274 * @return the start margin in pixels. 6275 */ 6276 public int getMarginStart() { 6277 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6278 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6279 doResolveMargins(); 6280 } 6281 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6282 case View.LAYOUT_DIRECTION_RTL: 6283 return rightMargin; 6284 case View.LAYOUT_DIRECTION_LTR: 6285 default: 6286 return leftMargin; 6287 } 6288 } 6289 6290 /** 6291 * Sets the relative end margin. 6292 * 6293 * @param end the end margin size 6294 * 6295 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6296 */ 6297 public void setMarginEnd(int end) { 6298 endMargin = end; 6299 mMarginFlags |= NEED_RESOLUTION_MASK; 6300 } 6301 6302 /** 6303 * Returns the end margin in pixels. 6304 * 6305 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6306 * 6307 * @return the end margin in pixels. 6308 */ 6309 public int getMarginEnd() { 6310 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6311 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6312 doResolveMargins(); 6313 } 6314 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6315 case View.LAYOUT_DIRECTION_RTL: 6316 return leftMargin; 6317 case View.LAYOUT_DIRECTION_LTR: 6318 default: 6319 return rightMargin; 6320 } 6321 } 6322 6323 /** 6324 * Check if margins are relative. 6325 * 6326 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6327 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6328 * 6329 * @return true if either marginStart or marginEnd has been set. 6330 */ 6331 public boolean isMarginRelative() { 6332 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6333 } 6334 6335 /** 6336 * Set the layout direction 6337 * @param layoutDirection the layout direction. 6338 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6339 * or {@link View#LAYOUT_DIRECTION_RTL}. 6340 */ 6341 public void setLayoutDirection(int layoutDirection) { 6342 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6343 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6344 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6345 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6346 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6347 if (isMarginRelative()) { 6348 mMarginFlags |= NEED_RESOLUTION_MASK; 6349 } else { 6350 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6351 } 6352 } 6353 } 6354 6355 /** 6356 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6357 * {@link View#LAYOUT_DIRECTION_RTL}. 6358 * 6359 * @return the layout direction. 6360 */ 6361 public int getLayoutDirection() { 6362 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6363 } 6364 6365 /** 6366 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6367 * may be overridden depending on layout direction. 6368 */ 6369 @Override 6370 public void resolveLayoutDirection(int layoutDirection) { 6371 setLayoutDirection(layoutDirection); 6372 6373 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6374 // Will use the left and right margins if no relative margin is defined. 6375 if (!isMarginRelative() || 6376 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6377 6378 // Proceed with resolution 6379 doResolveMargins(); 6380 } 6381 6382 private void doResolveMargins() { 6383 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 6384 // if left or right margins are not defined and if we have some start or end margin 6385 // defined then use those start and end margins. 6386 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 6387 && startMargin > DEFAULT_MARGIN_RELATIVE) { 6388 leftMargin = startMargin; 6389 } 6390 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 6391 && endMargin > DEFAULT_MARGIN_RELATIVE) { 6392 rightMargin = endMargin; 6393 } 6394 } else { 6395 // We have some relative margins (either the start one or the end one or both). So use 6396 // them and override what has been defined for left and right margins. If either start 6397 // or end margin is not defined, just set it to default "0". 6398 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6399 case View.LAYOUT_DIRECTION_RTL: 6400 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6401 endMargin : DEFAULT_MARGIN_RESOLVED; 6402 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6403 startMargin : DEFAULT_MARGIN_RESOLVED; 6404 break; 6405 case View.LAYOUT_DIRECTION_LTR: 6406 default: 6407 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6408 startMargin : DEFAULT_MARGIN_RESOLVED; 6409 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6410 endMargin : DEFAULT_MARGIN_RESOLVED; 6411 break; 6412 } 6413 } 6414 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6415 } 6416 6417 /** 6418 * @hide 6419 */ 6420 public boolean isLayoutRtl() { 6421 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 6422 } 6423 6424 /** 6425 * @hide 6426 */ 6427 @Override 6428 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6429 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6430 6431 fillDifference(canvas, 6432 view.getLeft() + oi.left, 6433 view.getTop() + oi.top, 6434 view.getRight() - oi.right, 6435 view.getBottom() - oi.bottom, 6436 leftMargin, 6437 topMargin, 6438 rightMargin, 6439 bottomMargin, 6440 paint); 6441 } 6442 } 6443 6444 /* Describes a touched view and the ids of the pointers that it has captured. 6445 * 6446 * This code assumes that pointer ids are always in the range 0..31 such that 6447 * it can use a bitfield to track which pointer ids are present. 6448 * As it happens, the lower layers of the input dispatch pipeline also use the 6449 * same trick so the assumption should be safe here... 6450 */ 6451 private static final class TouchTarget { 6452 private static final int MAX_RECYCLED = 32; 6453 private static final Object sRecycleLock = new Object[0]; 6454 private static TouchTarget sRecycleBin; 6455 private static int sRecycledCount; 6456 6457 public static final int ALL_POINTER_IDS = -1; // all ones 6458 6459 // The touched child view. 6460 public View child; 6461 6462 // The combined bit mask of pointer ids for all pointers captured by the target. 6463 public int pointerIdBits; 6464 6465 // The next target in the target list. 6466 public TouchTarget next; 6467 6468 private TouchTarget() { 6469 } 6470 6471 public static TouchTarget obtain(View child, int pointerIdBits) { 6472 final TouchTarget target; 6473 synchronized (sRecycleLock) { 6474 if (sRecycleBin == null) { 6475 target = new TouchTarget(); 6476 } else { 6477 target = sRecycleBin; 6478 sRecycleBin = target.next; 6479 sRecycledCount--; 6480 target.next = null; 6481 } 6482 } 6483 target.child = child; 6484 target.pointerIdBits = pointerIdBits; 6485 return target; 6486 } 6487 6488 public void recycle() { 6489 synchronized (sRecycleLock) { 6490 if (sRecycledCount < MAX_RECYCLED) { 6491 next = sRecycleBin; 6492 sRecycleBin = this; 6493 sRecycledCount += 1; 6494 } else { 6495 next = null; 6496 } 6497 child = null; 6498 } 6499 } 6500 } 6501 6502 /* Describes a hovered view. */ 6503 private static final class HoverTarget { 6504 private static final int MAX_RECYCLED = 32; 6505 private static final Object sRecycleLock = new Object[0]; 6506 private static HoverTarget sRecycleBin; 6507 private static int sRecycledCount; 6508 6509 // The hovered child view. 6510 public View child; 6511 6512 // The next target in the target list. 6513 public HoverTarget next; 6514 6515 private HoverTarget() { 6516 } 6517 6518 public static HoverTarget obtain(View child) { 6519 final HoverTarget target; 6520 synchronized (sRecycleLock) { 6521 if (sRecycleBin == null) { 6522 target = new HoverTarget(); 6523 } else { 6524 target = sRecycleBin; 6525 sRecycleBin = target.next; 6526 sRecycledCount--; 6527 target.next = null; 6528 } 6529 } 6530 target.child = child; 6531 return target; 6532 } 6533 6534 public void recycle() { 6535 synchronized (sRecycleLock) { 6536 if (sRecycledCount < MAX_RECYCLED) { 6537 next = sRecycleBin; 6538 sRecycleBin = this; 6539 sRecycledCount += 1; 6540 } else { 6541 next = null; 6542 } 6543 child = null; 6544 } 6545 } 6546 } 6547 6548 /** 6549 * Pooled class that orderes the children of a ViewGroup from start 6550 * to end based on how they are laid out and the layout direction. 6551 */ 6552 static class ChildListForAccessibility { 6553 6554 private static final int MAX_POOL_SIZE = 32; 6555 6556 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6557 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6558 6559 private final ArrayList<View> mChildren = new ArrayList<View>(); 6560 6561 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6562 6563 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6564 ChildListForAccessibility list = sPool.acquire(); 6565 if (list == null) { 6566 list = new ChildListForAccessibility(); 6567 } 6568 list.init(parent, sort); 6569 return list; 6570 } 6571 6572 public void recycle() { 6573 clear(); 6574 sPool.release(this); 6575 } 6576 6577 public int getChildCount() { 6578 return mChildren.size(); 6579 } 6580 6581 public View getChildAt(int index) { 6582 return mChildren.get(index); 6583 } 6584 6585 public int getChildIndex(View child) { 6586 return mChildren.indexOf(child); 6587 } 6588 6589 private void init(ViewGroup parent, boolean sort) { 6590 ArrayList<View> children = mChildren; 6591 final int childCount = parent.getChildCount(); 6592 for (int i = 0; i < childCount; i++) { 6593 View child = parent.getChildAt(i); 6594 children.add(child); 6595 } 6596 if (sort) { 6597 ArrayList<ViewLocationHolder> holders = mHolders; 6598 for (int i = 0; i < childCount; i++) { 6599 View child = children.get(i); 6600 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6601 holders.add(holder); 6602 } 6603 Collections.sort(holders); 6604 for (int i = 0; i < childCount; i++) { 6605 ViewLocationHolder holder = holders.get(i); 6606 children.set(i, holder.mView); 6607 holder.recycle(); 6608 } 6609 holders.clear(); 6610 } 6611 } 6612 6613 private void clear() { 6614 mChildren.clear(); 6615 } 6616 } 6617 6618 /** 6619 * Pooled class that holds a View and its location with respect to 6620 * a specified root. This enables sorting of views based on their 6621 * coordinates without recomputing the position relative to the root 6622 * on every comparison. 6623 */ 6624 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6625 6626 private static final int MAX_POOL_SIZE = 32; 6627 6628 private static final SynchronizedPool<ViewLocationHolder> sPool = 6629 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6630 6631 private final Rect mLocation = new Rect(); 6632 6633 public View mView; 6634 6635 private int mLayoutDirection; 6636 6637 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6638 ViewLocationHolder holder = sPool.acquire(); 6639 if (holder == null) { 6640 holder = new ViewLocationHolder(); 6641 } 6642 holder.init(root, view); 6643 return holder; 6644 } 6645 6646 public void recycle() { 6647 clear(); 6648 sPool.release(this); 6649 } 6650 6651 @Override 6652 public int compareTo(ViewLocationHolder another) { 6653 // This instance is greater than an invalid argument. 6654 if (another == null) { 6655 return 1; 6656 } 6657 if (getClass() != another.getClass()) { 6658 return 1; 6659 } 6660 // First is above second. 6661 if (mLocation.bottom - another.mLocation.top <= 0) { 6662 return -1; 6663 } 6664 // First is below second. 6665 if (mLocation.top - another.mLocation.bottom >= 0) { 6666 return 1; 6667 } 6668 // LTR 6669 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6670 final int leftDifference = mLocation.left - another.mLocation.left; 6671 // First more to the left than second. 6672 if (leftDifference != 0) { 6673 return leftDifference; 6674 } 6675 } else { // RTL 6676 final int rightDifference = mLocation.right - another.mLocation.right; 6677 // First more to the right than second. 6678 if (rightDifference != 0) { 6679 return -rightDifference; 6680 } 6681 } 6682 // Break tie by top. 6683 final int topDiference = mLocation.top - another.mLocation.top; 6684 if (topDiference != 0) { 6685 return topDiference; 6686 } 6687 // Break tie by height. 6688 final int heightDiference = mLocation.height() - another.mLocation.height(); 6689 if (heightDiference != 0) { 6690 return -heightDiference; 6691 } 6692 // Break tie by width. 6693 final int widthDiference = mLocation.width() - another.mLocation.width(); 6694 if (widthDiference != 0) { 6695 return -widthDiference; 6696 } 6697 // Just break the tie somehow. The accessibliity ids are unique 6698 // and stable, hence this is deterministic tie breaking. 6699 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6700 } 6701 6702 private void init(ViewGroup root, View view) { 6703 Rect viewLocation = mLocation; 6704 view.getDrawingRect(viewLocation); 6705 root.offsetDescendantRectToMyCoords(view, viewLocation); 6706 mView = view; 6707 mLayoutDirection = root.getLayoutDirection(); 6708 } 6709 6710 private void clear() { 6711 mView = null; 6712 mLocation.set(0, 0, 0, 0); 6713 } 6714 } 6715 6716 private static Paint getDebugPaint() { 6717 if (sDebugPaint == null) { 6718 sDebugPaint = new Paint(); 6719 sDebugPaint.setAntiAlias(false); 6720 } 6721 return sDebugPaint; 6722 } 6723 6724 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6725 if (sDebugLines== null) { 6726 // TODO: This won't work with multiple UI threads in a single process 6727 sDebugLines = new float[16]; 6728 } 6729 6730 sDebugLines[0] = x1; 6731 sDebugLines[1] = y1; 6732 sDebugLines[2] = x2; 6733 sDebugLines[3] = y1; 6734 6735 sDebugLines[4] = x2; 6736 sDebugLines[5] = y1; 6737 sDebugLines[6] = x2; 6738 sDebugLines[7] = y2; 6739 6740 sDebugLines[8] = x2; 6741 sDebugLines[9] = y2; 6742 sDebugLines[10] = x1; 6743 sDebugLines[11] = y2; 6744 6745 sDebugLines[12] = x1; 6746 sDebugLines[13] = y2; 6747 sDebugLines[14] = x1; 6748 sDebugLines[15] = y1; 6749 6750 canvas.drawLines(sDebugLines, paint); 6751 } 6752} 6753