ViewGroup.java revision dd26bfc13e119c67ea7cfd5f0fb457d592a2ce89
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.annotation.IdRes; 21import android.annotation.NonNull; 22import android.annotation.UiThread; 23import android.content.Context; 24import android.content.Intent; 25import android.content.pm.PackageManager; 26import android.content.res.Configuration; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Canvas; 30import android.graphics.Color; 31import android.graphics.Insets; 32import android.graphics.Matrix; 33import android.graphics.Paint; 34import android.graphics.PointF; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.os.Build; 39import android.os.Bundle; 40import android.os.Parcelable; 41import android.os.SystemClock; 42import android.util.AttributeSet; 43import android.util.Log; 44import android.util.Pools.SynchronizedPool; 45import android.util.SparseArray; 46import android.util.SparseBooleanArray; 47import android.view.accessibility.AccessibilityEvent; 48import android.view.accessibility.AccessibilityNodeInfo; 49import android.view.animation.Animation; 50import android.view.animation.AnimationUtils; 51import android.view.animation.LayoutAnimationController; 52import android.view.animation.Transformation; 53 54import com.android.internal.R; 55import com.android.internal.util.Predicate; 56 57import java.util.ArrayList; 58import java.util.Collections; 59import java.util.HashSet; 60import java.util.List; 61import java.util.Map; 62import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 63 64/** 65 * <p> 66 * A <code>ViewGroup</code> is a special view that can contain other views 67 * (called children.) The view group is the base class for layouts and views 68 * containers. This class also defines the 69 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 70 * class for layouts parameters. 71 * </p> 72 * 73 * <p> 74 * Also see {@link LayoutParams} for layout attributes. 75 * </p> 76 * 77 * <div class="special reference"> 78 * <h3>Developer Guides</h3> 79 * <p>For more information about creating user interface layouts, read the 80 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 81 * guide.</p></div> 82 * 83 * <p>Here is a complete implementation of a custom ViewGroup that implements 84 * a simple {@link android.widget.FrameLayout} along with the ability to stack 85 * children in left and right gutters.</p> 86 * 87 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 88 * Complete} 89 * 90 * <p>If you are implementing XML layout attributes as shown in the example, this is the 91 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 92 * 93 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 94 * 95 * <p>Finally the layout manager can be used in an XML layout like so:</p> 96 * 97 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 98 * 99 * @attr ref android.R.styleable#ViewGroup_clipChildren 100 * @attr ref android.R.styleable#ViewGroup_clipToPadding 101 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 102 * @attr ref android.R.styleable#ViewGroup_animationCache 103 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 104 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 105 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 106 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 107 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 108 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 109 * @attr ref android.R.styleable#ViewGroup_layoutMode 110 */ 111@UiThread 112public abstract class ViewGroup extends View implements ViewParent, ViewManager { 113 private static final String TAG = "ViewGroup"; 114 115 private static final boolean DBG = false; 116 /** @hide */ 117 public static boolean DEBUG_DRAW = false; 118 119 /** 120 * Views which have been hidden or removed which need to be animated on 121 * their way out. 122 * This field should be made private, so it is hidden from the SDK. 123 * {@hide} 124 */ 125 protected ArrayList<View> mDisappearingChildren; 126 127 /** 128 * Listener used to propagate events indicating when children are added 129 * and/or removed from a view group. 130 * This field should be made private, so it is hidden from the SDK. 131 * {@hide} 132 */ 133 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 134 135 // The view contained within this ViewGroup that has or contains focus. 136 private View mFocused; 137 138 /** 139 * A Transformation used when drawing children, to 140 * apply on the child being drawn. 141 */ 142 private Transformation mChildTransformation; 143 144 /** 145 * Used to track the current invalidation region. 146 */ 147 RectF mInvalidateRegion; 148 149 /** 150 * A Transformation used to calculate a correct 151 * invalidation area when the application is autoscaled. 152 */ 153 Transformation mInvalidationTransformation; 154 155 // View currently under an ongoing drag. Can be null, a child or this window. 156 private View mCurrentDragView; 157 158 // Metadata about the ongoing drag 159 private DragEvent mCurrentDragStartEvent; 160 private boolean mIsInterestedInDrag; 161 private HashSet<View> mChildrenInterestedInDrag; 162 163 // Used during drag dispatch 164 private PointF mLocalPoint; 165 166 // Lazily-created holder for point computations. 167 private float[] mTempPoint; 168 169 // Layout animation 170 private LayoutAnimationController mLayoutAnimationController; 171 private Animation.AnimationListener mAnimationListener; 172 173 // First touch target in the linked list of touch targets. 174 private TouchTarget mFirstTouchTarget; 175 176 // For debugging only. You can see these in hierarchyviewer. 177 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 178 @ViewDebug.ExportedProperty(category = "events") 179 private long mLastTouchDownTime; 180 @ViewDebug.ExportedProperty(category = "events") 181 private int mLastTouchDownIndex = -1; 182 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 183 @ViewDebug.ExportedProperty(category = "events") 184 private float mLastTouchDownX; 185 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 186 @ViewDebug.ExportedProperty(category = "events") 187 private float mLastTouchDownY; 188 189 // First hover target in the linked list of hover targets. 190 // The hover targets are children which have received ACTION_HOVER_ENTER. 191 // They might not have actually handled the hover event, but we will 192 // continue sending hover events to them as long as the pointer remains over 193 // their bounds and the view group does not intercept hover. 194 private HoverTarget mFirstHoverTarget; 195 196 // True if the view group itself received a hover event. 197 // It might not have actually handled the hover event. 198 private boolean mHoveredSelf; 199 200 /** 201 * Internal flags. 202 * 203 * This field should be made private, so it is hidden from the SDK. 204 * {@hide} 205 */ 206 @ViewDebug.ExportedProperty(flagMapping = { 207 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 208 name = "CLIP_CHILDREN"), 209 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 210 name = "CLIP_TO_PADDING"), 211 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 212 name = "PADDING_NOT_NULL") 213 }, formatToHexString = true) 214 protected int mGroupFlags; 215 216 /** 217 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 218 */ 219 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 220 221 /** 222 * NOTE: If you change the flags below make sure to reflect the changes 223 * the DisplayList class 224 */ 225 226 // When set, ViewGroup invalidates only the child's rectangle 227 // Set by default 228 static final int FLAG_CLIP_CHILDREN = 0x1; 229 230 // When set, ViewGroup excludes the padding area from the invalidate rectangle 231 // Set by default 232 private static final int FLAG_CLIP_TO_PADDING = 0x2; 233 234 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 235 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 236 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 237 238 // When set, dispatchDraw() will run the layout animation and unset the flag 239 private static final int FLAG_RUN_ANIMATION = 0x8; 240 241 // When set, there is either no layout animation on the ViewGroup or the layout 242 // animation is over 243 // Set by default 244 static final int FLAG_ANIMATION_DONE = 0x10; 245 246 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 247 // to clip it, even if FLAG_CLIP_TO_PADDING is set 248 private static final int FLAG_PADDING_NOT_NULL = 0x20; 249 250 /** @deprecated - functionality removed */ 251 private static final int FLAG_ANIMATION_CACHE = 0x40; 252 253 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 254 // layout animation; this avoid clobbering the hierarchy 255 // Automatically set when the layout animation starts, depending on the animation's 256 // characteristics 257 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 258 259 // When set, the next call to drawChild() will clear mChildTransformation's matrix 260 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 261 262 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 263 // the children's Bitmap caches if necessary 264 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 265 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 266 267 /** 268 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 269 * to get the index of the child to draw for that iteration. 270 * 271 * @hide 272 */ 273 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 274 275 /** 276 * When set, this ViewGroup supports static transformations on children; this causes 277 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 278 * invoked when a child is drawn. 279 * 280 * Any subclass overriding 281 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 282 * set this flags in {@link #mGroupFlags}. 283 * 284 * {@hide} 285 */ 286 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 287 288 // UNUSED FLAG VALUE: 0x1000; 289 290 /** 291 * When set, this ViewGroup's drawable states also include those 292 * of its children. 293 */ 294 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 295 296 /** @deprecated functionality removed */ 297 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 298 299 /** @deprecated functionality removed */ 300 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 301 302 /** 303 * When set, this group will go through its list of children to notify them of 304 * any drawable state change. 305 */ 306 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 307 308 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 309 310 /** 311 * This view will get focus before any of its descendants. 312 */ 313 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 314 315 /** 316 * This view will get focus only if none of its descendants want it. 317 */ 318 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 319 320 /** 321 * This view will block any of its descendants from getting focus, even 322 * if they are focusable. 323 */ 324 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 325 326 /** 327 * Used to map between enum in attrubutes and flag values. 328 */ 329 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 330 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 331 FOCUS_BLOCK_DESCENDANTS}; 332 333 /** 334 * When set, this ViewGroup should not intercept touch events. 335 * {@hide} 336 */ 337 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 338 339 /** 340 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 341 */ 342 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 343 344 /** 345 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 346 * to children when adding new views. This is used to prevent multiple 347 * onAttached calls when a ViewGroup adds children in its own onAttached method. 348 */ 349 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 350 351 /** 352 * When true, indicates that a layoutMode has been explicitly set, either with 353 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 354 * This distinguishes the situation in which a layout mode was inherited from 355 * one of the ViewGroup's ancestors and cached locally. 356 */ 357 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 358 359 static final int FLAG_IS_TRANSITION_GROUP = 0x1000000; 360 361 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000; 362 363 /** 364 * When set, focus will not be permitted to enter this group if a touchscreen is present. 365 */ 366 static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000; 367 368 /** 369 * When true, indicates that a call to startActionModeForChild was made with the type parameter 370 * and should not be ignored. This helps in backwards compatibility with the existing method 371 * without a type. 372 * 373 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 374 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 375 */ 376 private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED = 0x8000000; 377 378 /** 379 * When true, indicates that a call to startActionModeForChild was made without the type 380 * parameter. This helps in backwards compatibility with the existing method 381 * without a type. 382 * 383 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 384 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 385 */ 386 private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED = 0x10000000; 387 388 /** 389 * Indicates which types of drawing caches are to be kept in memory. 390 * This field should be made private, so it is hidden from the SDK. 391 * {@hide} 392 */ 393 protected int mPersistentDrawingCache; 394 395 /** 396 * Used to indicate that no drawing cache should be kept in memory. 397 */ 398 public static final int PERSISTENT_NO_CACHE = 0x0; 399 400 /** 401 * Used to indicate that the animation drawing cache should be kept in memory. 402 */ 403 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 404 405 /** 406 * Used to indicate that the scrolling drawing cache should be kept in memory. 407 */ 408 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 409 410 /** 411 * Used to indicate that all drawing caches should be kept in memory. 412 */ 413 public static final int PERSISTENT_ALL_CACHES = 0x3; 414 415 // Layout Modes 416 417 private static final int LAYOUT_MODE_UNDEFINED = -1; 418 419 /** 420 * This constant is a {@link #setLayoutMode(int) layoutMode}. 421 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 422 * {@link #getRight() right} and {@link #getBottom() bottom}. 423 */ 424 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 425 426 /** 427 * This constant is a {@link #setLayoutMode(int) layoutMode}. 428 * Optical bounds describe where a widget appears to be. They sit inside the clip 429 * bounds which need to cover a larger area to allow other effects, 430 * such as shadows and glows, to be drawn. 431 */ 432 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 433 434 /** @hide */ 435 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 436 437 /** 438 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 439 * are set at the same time. 440 */ 441 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 442 443 // Index of the child's left position in the mLocation array 444 private static final int CHILD_LEFT_INDEX = 0; 445 // Index of the child's top position in the mLocation array 446 private static final int CHILD_TOP_INDEX = 1; 447 448 // Child views of this ViewGroup 449 private View[] mChildren; 450 // Number of valid children in the mChildren array, the rest should be null or not 451 // considered as children 452 private int mChildrenCount; 453 454 // Whether layout calls are currently being suppressed, controlled by calls to 455 // suppressLayout() 456 boolean mSuppressLayout = false; 457 458 // Whether any layout calls have actually been suppressed while mSuppressLayout 459 // has been true. This tracks whether we need to issue a requestLayout() when 460 // layout is later re-enabled. 461 private boolean mLayoutCalledWhileSuppressed = false; 462 463 private static final int ARRAY_INITIAL_CAPACITY = 12; 464 private static final int ARRAY_CAPACITY_INCREMENT = 12; 465 466 private static Paint sDebugPaint; 467 private static float[] sDebugLines; 468 469 // Used to draw cached views 470 Paint mCachePaint; 471 472 // Used to animate add/remove changes in layout 473 private LayoutTransition mTransition; 474 475 // The set of views that are currently being transitioned. This list is used to track views 476 // being removed that should not actually be removed from the parent yet because they are 477 // being animated. 478 private ArrayList<View> mTransitioningViews; 479 480 // List of children changing visibility. This is used to potentially keep rendering 481 // views during a transition when they otherwise would have become gone/invisible 482 private ArrayList<View> mVisibilityChangingChildren; 483 484 // Temporary holder of presorted children, only used for 485 // input/software draw dispatch for correctly Z ordering. 486 private ArrayList<View> mPreSortedChildren; 487 488 // Indicates how many of this container's child subtrees contain transient state 489 @ViewDebug.ExportedProperty(category = "layout") 490 private int mChildCountWithTransientState = 0; 491 492 /** 493 * Currently registered axes for nested scrolling. Flag set consisting of 494 * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE} 495 * for null. 496 */ 497 private int mNestedScrollAxes; 498 499 // Used to manage the list of transient views, added by addTransientView() 500 private List<Integer> mTransientIndices = null; 501 private List<View> mTransientViews = null; 502 503 504 /** 505 * Empty ActionMode used as a sentinel in recursive entries to startActionModeForChild. 506 * 507 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 508 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 509 */ 510 private static final ActionMode SENTINEL_ACTION_MODE = new ActionMode() { 511 @Override 512 public void setTitle(CharSequence title) {} 513 514 @Override 515 public void setTitle(int resId) {} 516 517 @Override 518 public void setSubtitle(CharSequence subtitle) {} 519 520 @Override 521 public void setSubtitle(int resId) {} 522 523 @Override 524 public void setCustomView(View view) {} 525 526 @Override 527 public void invalidate() {} 528 529 @Override 530 public void finish() {} 531 532 @Override 533 public Menu getMenu() { 534 return null; 535 } 536 537 @Override 538 public CharSequence getTitle() { 539 return null; 540 } 541 542 @Override 543 public CharSequence getSubtitle() { 544 return null; 545 } 546 547 @Override 548 public View getCustomView() { 549 return null; 550 } 551 552 @Override 553 public MenuInflater getMenuInflater() { 554 return null; 555 } 556 }; 557 558 public ViewGroup(Context context) { 559 this(context, null); 560 } 561 562 public ViewGroup(Context context, AttributeSet attrs) { 563 this(context, attrs, 0); 564 } 565 566 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 567 this(context, attrs, defStyleAttr, 0); 568 } 569 570 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 571 super(context, attrs, defStyleAttr, defStyleRes); 572 initViewGroup(); 573 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 574 } 575 576 private boolean debugDraw() { 577 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 578 } 579 580 private void initViewGroup() { 581 // ViewGroup doesn't draw by default 582 if (!debugDraw()) { 583 setFlags(WILL_NOT_DRAW, DRAW_MASK); 584 } 585 mGroupFlags |= FLAG_CLIP_CHILDREN; 586 mGroupFlags |= FLAG_CLIP_TO_PADDING; 587 mGroupFlags |= FLAG_ANIMATION_DONE; 588 mGroupFlags |= FLAG_ANIMATION_CACHE; 589 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 590 591 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 592 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 593 } 594 595 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 596 597 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 598 mChildrenCount = 0; 599 600 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 601 } 602 603 private void initFromAttributes( 604 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 605 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr, 606 defStyleRes); 607 608 final int N = a.getIndexCount(); 609 for (int i = 0; i < N; i++) { 610 int attr = a.getIndex(i); 611 switch (attr) { 612 case R.styleable.ViewGroup_clipChildren: 613 setClipChildren(a.getBoolean(attr, true)); 614 break; 615 case R.styleable.ViewGroup_clipToPadding: 616 setClipToPadding(a.getBoolean(attr, true)); 617 break; 618 case R.styleable.ViewGroup_animationCache: 619 setAnimationCacheEnabled(a.getBoolean(attr, true)); 620 break; 621 case R.styleable.ViewGroup_persistentDrawingCache: 622 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 623 break; 624 case R.styleable.ViewGroup_addStatesFromChildren: 625 setAddStatesFromChildren(a.getBoolean(attr, false)); 626 break; 627 case R.styleable.ViewGroup_alwaysDrawnWithCache: 628 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 629 break; 630 case R.styleable.ViewGroup_layoutAnimation: 631 int id = a.getResourceId(attr, -1); 632 if (id > 0) { 633 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 634 } 635 break; 636 case R.styleable.ViewGroup_descendantFocusability: 637 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 638 break; 639 case R.styleable.ViewGroup_splitMotionEvents: 640 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 641 break; 642 case R.styleable.ViewGroup_animateLayoutChanges: 643 boolean animateLayoutChanges = a.getBoolean(attr, false); 644 if (animateLayoutChanges) { 645 setLayoutTransition(new LayoutTransition()); 646 } 647 break; 648 case R.styleable.ViewGroup_layoutMode: 649 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 650 break; 651 case R.styleable.ViewGroup_transitionGroup: 652 setTransitionGroup(a.getBoolean(attr, false)); 653 break; 654 case R.styleable.ViewGroup_touchscreenBlocksFocus: 655 setTouchscreenBlocksFocus(a.getBoolean(attr, false)); 656 break; 657 } 658 } 659 660 a.recycle(); 661 } 662 663 /** 664 * Gets the descendant focusability of this view group. The descendant 665 * focusability defines the relationship between this view group and its 666 * descendants when looking for a view to take focus in 667 * {@link #requestFocus(int, android.graphics.Rect)}. 668 * 669 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 670 * {@link #FOCUS_BLOCK_DESCENDANTS}. 671 */ 672 @ViewDebug.ExportedProperty(category = "focus", mapping = { 673 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 674 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 675 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 676 }) 677 public int getDescendantFocusability() { 678 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 679 } 680 681 /** 682 * Set the descendant focusability of this view group. This defines the relationship 683 * between this view group and its descendants when looking for a view to 684 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 685 * 686 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 687 * {@link #FOCUS_BLOCK_DESCENDANTS}. 688 */ 689 public void setDescendantFocusability(int focusability) { 690 switch (focusability) { 691 case FOCUS_BEFORE_DESCENDANTS: 692 case FOCUS_AFTER_DESCENDANTS: 693 case FOCUS_BLOCK_DESCENDANTS: 694 break; 695 default: 696 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 697 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 698 } 699 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 700 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 701 } 702 703 @Override 704 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 705 if (mFocused != null) { 706 mFocused.unFocus(this); 707 mFocused = null; 708 } 709 super.handleFocusGainInternal(direction, previouslyFocusedRect); 710 } 711 712 @Override 713 public void requestChildFocus(View child, View focused) { 714 if (DBG) { 715 System.out.println(this + " requestChildFocus()"); 716 } 717 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 718 return; 719 } 720 721 // Unfocus us, if necessary 722 super.unFocus(focused); 723 724 // We had a previous notion of who had focus. Clear it. 725 if (mFocused != child) { 726 if (mFocused != null) { 727 mFocused.unFocus(focused); 728 } 729 730 mFocused = child; 731 } 732 if (mParent != null) { 733 mParent.requestChildFocus(this, focused); 734 } 735 } 736 737 @Override 738 public void focusableViewAvailable(View v) { 739 if (mParent != null 740 // shortcut: don't report a new focusable view if we block our descendants from 741 // getting focus 742 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 743 && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen()) 744 // shortcut: don't report a new focusable view if we already are focused 745 // (and we don't prefer our descendants) 746 // 747 // note: knowing that mFocused is non-null is not a good enough reason 748 // to break the traversal since in that case we'd actually have to find 749 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 750 // an ancestor of v; this will get checked for at ViewAncestor 751 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 752 mParent.focusableViewAvailable(v); 753 } 754 } 755 756 @Override 757 public boolean showContextMenuForChild(View originalView) { 758 return mParent != null && mParent.showContextMenuForChild(originalView); 759 } 760 761 @Override 762 public boolean showContextMenuForChild(View originalView, float x, float y) { 763 return mParent != null && mParent.showContextMenuForChild(originalView, x, y); 764 } 765 766 @Override 767 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 768 if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED) == 0) { 769 // This is the original call. 770 try { 771 mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED; 772 return startActionModeForChild(originalView, callback, ActionMode.TYPE_PRIMARY); 773 } finally { 774 mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED; 775 } 776 } else { 777 // We are being called from the new method with type. 778 return SENTINEL_ACTION_MODE; 779 } 780 } 781 782 @Override 783 public ActionMode startActionModeForChild( 784 View originalView, ActionMode.Callback callback, int type) { 785 if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED) == 0 786 && type == ActionMode.TYPE_PRIMARY) { 787 ActionMode mode; 788 try { 789 mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED; 790 mode = startActionModeForChild(originalView, callback); 791 } finally { 792 mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED; 793 } 794 if (mode != SENTINEL_ACTION_MODE) { 795 return mode; 796 } 797 } 798 if (mParent != null) { 799 try { 800 return mParent.startActionModeForChild(originalView, callback, type); 801 } catch (AbstractMethodError ame) { 802 // Custom view parents might not implement this method. 803 return mParent.startActionModeForChild(originalView, callback); 804 } 805 } 806 return null; 807 } 808 809 /** 810 * @hide 811 */ 812 @Override 813 public boolean dispatchActivityResult( 814 String who, int requestCode, int resultCode, Intent data) { 815 if (super.dispatchActivityResult(who, requestCode, resultCode, data)) { 816 return true; 817 } 818 int childCount = getChildCount(); 819 for (int i = 0; i < childCount; i++) { 820 View child = getChildAt(i); 821 if (child.dispatchActivityResult(who, requestCode, resultCode, data)) { 822 return true; 823 } 824 } 825 return false; 826 } 827 828 /** 829 * Find the nearest view in the specified direction that wants to take 830 * focus. 831 * 832 * @param focused The view that currently has focus 833 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 834 * FOCUS_RIGHT, or 0 for not applicable. 835 */ 836 @Override 837 public View focusSearch(View focused, int direction) { 838 if (isRootNamespace()) { 839 // root namespace means we should consider ourselves the top of the 840 // tree for focus searching; otherwise we could be focus searching 841 // into other tabs. see LocalActivityManager and TabHost for more info 842 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 843 } else if (mParent != null) { 844 return mParent.focusSearch(focused, direction); 845 } 846 return null; 847 } 848 849 @Override 850 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 851 return false; 852 } 853 854 @Override 855 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 856 ViewParent parent = mParent; 857 if (parent == null) { 858 return false; 859 } 860 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 861 if (!propagate) { 862 return false; 863 } 864 return parent.requestSendAccessibilityEvent(this, event); 865 } 866 867 /** 868 * Called when a child has requested sending an {@link AccessibilityEvent} and 869 * gives an opportunity to its parent to augment the event. 870 * <p> 871 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 872 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 873 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 874 * is responsible for handling this call. 875 * </p> 876 * 877 * @param child The child which requests sending the event. 878 * @param event The event to be sent. 879 * @return True if the event should be sent. 880 * 881 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 882 */ 883 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 884 if (mAccessibilityDelegate != null) { 885 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 886 } else { 887 return onRequestSendAccessibilityEventInternal(child, event); 888 } 889 } 890 891 /** 892 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 893 * 894 * Note: Called from the default {@link View.AccessibilityDelegate}. 895 * 896 * @hide 897 */ 898 public boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 899 return true; 900 } 901 902 /** 903 * Called when a child view has changed whether or not it is tracking transient state. 904 */ 905 @Override 906 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 907 final boolean oldHasTransientState = hasTransientState(); 908 if (childHasTransientState) { 909 mChildCountWithTransientState++; 910 } else { 911 mChildCountWithTransientState--; 912 } 913 914 final boolean newHasTransientState = hasTransientState(); 915 if (mParent != null && oldHasTransientState != newHasTransientState) { 916 try { 917 mParent.childHasTransientStateChanged(this, newHasTransientState); 918 } catch (AbstractMethodError e) { 919 Log.e(TAG, mParent.getClass().getSimpleName() + 920 " does not fully implement ViewParent", e); 921 } 922 } 923 } 924 925 @Override 926 public boolean hasTransientState() { 927 return mChildCountWithTransientState > 0 || super.hasTransientState(); 928 } 929 930 @Override 931 public boolean dispatchUnhandledMove(View focused, int direction) { 932 return mFocused != null && 933 mFocused.dispatchUnhandledMove(focused, direction); 934 } 935 936 @Override 937 public void clearChildFocus(View child) { 938 if (DBG) { 939 System.out.println(this + " clearChildFocus()"); 940 } 941 942 mFocused = null; 943 if (mParent != null) { 944 mParent.clearChildFocus(this); 945 } 946 } 947 948 @Override 949 public void clearFocus() { 950 if (DBG) { 951 System.out.println(this + " clearFocus()"); 952 } 953 if (mFocused == null) { 954 super.clearFocus(); 955 } else { 956 View focused = mFocused; 957 mFocused = null; 958 focused.clearFocus(); 959 } 960 } 961 962 @Override 963 void unFocus(View focused) { 964 if (DBG) { 965 System.out.println(this + " unFocus()"); 966 } 967 if (mFocused == null) { 968 super.unFocus(focused); 969 } else { 970 mFocused.unFocus(focused); 971 mFocused = null; 972 } 973 } 974 975 /** 976 * Returns the focused child of this view, if any. The child may have focus 977 * or contain focus. 978 * 979 * @return the focused child or null. 980 */ 981 public View getFocusedChild() { 982 return mFocused; 983 } 984 985 View getDeepestFocusedChild() { 986 View v = this; 987 while (v != null) { 988 if (v.isFocused()) { 989 return v; 990 } 991 v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null; 992 } 993 return null; 994 } 995 996 /** 997 * Returns true if this view has or contains focus 998 * 999 * @return true if this view has or contains focus 1000 */ 1001 @Override 1002 public boolean hasFocus() { 1003 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 1004 } 1005 1006 /* 1007 * (non-Javadoc) 1008 * 1009 * @see android.view.View#findFocus() 1010 */ 1011 @Override 1012 public View findFocus() { 1013 if (DBG) { 1014 System.out.println("Find focus in " + this + ": flags=" 1015 + isFocused() + ", child=" + mFocused); 1016 } 1017 1018 if (isFocused()) { 1019 return this; 1020 } 1021 1022 if (mFocused != null) { 1023 return mFocused.findFocus(); 1024 } 1025 return null; 1026 } 1027 1028 @Override 1029 public boolean hasFocusable() { 1030 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 1031 return false; 1032 } 1033 1034 if (isFocusable()) { 1035 return true; 1036 } 1037 1038 final int descendantFocusability = getDescendantFocusability(); 1039 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1040 final int count = mChildrenCount; 1041 final View[] children = mChildren; 1042 1043 for (int i = 0; i < count; i++) { 1044 final View child = children[i]; 1045 if (child.hasFocusable()) { 1046 return true; 1047 } 1048 } 1049 } 1050 1051 return false; 1052 } 1053 1054 @Override 1055 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 1056 final int focusableCount = views.size(); 1057 1058 final int descendantFocusability = getDescendantFocusability(); 1059 1060 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1061 if (shouldBlockFocusForTouchscreen()) { 1062 focusableMode |= FOCUSABLES_TOUCH_MODE; 1063 } 1064 1065 final int count = mChildrenCount; 1066 final View[] children = mChildren; 1067 1068 for (int i = 0; i < count; i++) { 1069 final View child = children[i]; 1070 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1071 child.addFocusables(views, direction, focusableMode); 1072 } 1073 } 1074 } 1075 1076 // we add ourselves (if focusable) in all cases except for when we are 1077 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 1078 // to avoid the focus search finding layouts when a more precise search 1079 // among the focusable children would be more interesting. 1080 if ((descendantFocusability != FOCUS_AFTER_DESCENDANTS 1081 // No focusable descendants 1082 || (focusableCount == views.size())) && 1083 (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())) { 1084 super.addFocusables(views, direction, focusableMode); 1085 } 1086 } 1087 1088 /** 1089 * Set whether this ViewGroup should ignore focus requests for itself and its children. 1090 * If this option is enabled and the ViewGroup or a descendant currently has focus, focus 1091 * will proceed forward. 1092 * 1093 * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen 1094 */ 1095 public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) { 1096 if (touchscreenBlocksFocus) { 1097 mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1098 if (hasFocus()) { 1099 final View focusedChild = getDeepestFocusedChild(); 1100 if (!focusedChild.isFocusableInTouchMode()) { 1101 final View newFocus = focusSearch(FOCUS_FORWARD); 1102 if (newFocus != null) { 1103 newFocus.requestFocus(); 1104 } 1105 } 1106 } 1107 } else { 1108 mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1109 } 1110 } 1111 1112 /** 1113 * Check whether this ViewGroup should ignore focus requests for itself and its children. 1114 */ 1115 public boolean getTouchscreenBlocksFocus() { 1116 return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0; 1117 } 1118 1119 boolean shouldBlockFocusForTouchscreen() { 1120 return getTouchscreenBlocksFocus() && 1121 mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN); 1122 } 1123 1124 @Override 1125 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 1126 super.findViewsWithText(outViews, text, flags); 1127 final int childrenCount = mChildrenCount; 1128 final View[] children = mChildren; 1129 for (int i = 0; i < childrenCount; i++) { 1130 View child = children[i]; 1131 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1132 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 1133 child.findViewsWithText(outViews, text, flags); 1134 } 1135 } 1136 } 1137 1138 /** @hide */ 1139 @Override 1140 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1141 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 1142 if (foundView != null) { 1143 return foundView; 1144 } 1145 1146 if (getAccessibilityNodeProvider() != null) { 1147 return null; 1148 } 1149 1150 final int childrenCount = mChildrenCount; 1151 final View[] children = mChildren; 1152 for (int i = 0; i < childrenCount; i++) { 1153 View child = children[i]; 1154 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 1155 if (foundView != null) { 1156 return foundView; 1157 } 1158 } 1159 1160 return null; 1161 } 1162 1163 @Override 1164 public void dispatchWindowFocusChanged(boolean hasFocus) { 1165 super.dispatchWindowFocusChanged(hasFocus); 1166 final int count = mChildrenCount; 1167 final View[] children = mChildren; 1168 for (int i = 0; i < count; i++) { 1169 children[i].dispatchWindowFocusChanged(hasFocus); 1170 } 1171 } 1172 1173 @Override 1174 public void addTouchables(ArrayList<View> views) { 1175 super.addTouchables(views); 1176 1177 final int count = mChildrenCount; 1178 final View[] children = mChildren; 1179 1180 for (int i = 0; i < count; i++) { 1181 final View child = children[i]; 1182 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1183 child.addTouchables(views); 1184 } 1185 } 1186 } 1187 1188 /** 1189 * @hide 1190 */ 1191 @Override 1192 public void makeOptionalFitsSystemWindows() { 1193 super.makeOptionalFitsSystemWindows(); 1194 final int count = mChildrenCount; 1195 final View[] children = mChildren; 1196 for (int i = 0; i < count; i++) { 1197 children[i].makeOptionalFitsSystemWindows(); 1198 } 1199 } 1200 1201 @Override 1202 public void dispatchDisplayHint(int hint) { 1203 super.dispatchDisplayHint(hint); 1204 final int count = mChildrenCount; 1205 final View[] children = mChildren; 1206 for (int i = 0; i < count; i++) { 1207 children[i].dispatchDisplayHint(hint); 1208 } 1209 } 1210 1211 /** 1212 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1213 * action. 1214 * 1215 * @param child The view whose visibility has changed 1216 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1217 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1218 * @hide 1219 */ 1220 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1221 if (mTransition != null) { 1222 if (newVisibility == VISIBLE) { 1223 mTransition.showChild(this, child, oldVisibility); 1224 } else { 1225 mTransition.hideChild(this, child, newVisibility); 1226 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1227 // Only track this on disappearing views - appearing views are already visible 1228 // and don't need special handling during drawChild() 1229 if (mVisibilityChangingChildren == null) { 1230 mVisibilityChangingChildren = new ArrayList<View>(); 1231 } 1232 mVisibilityChangingChildren.add(child); 1233 addDisappearingView(child); 1234 } 1235 } 1236 } 1237 1238 // in all cases, for drags 1239 if (newVisibility == VISIBLE && mCurrentDragStartEvent != null) { 1240 if (!mChildrenInterestedInDrag.contains(child)) { 1241 notifyChildOfDragStart(child); 1242 } 1243 } 1244 } 1245 1246 @Override 1247 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1248 super.dispatchVisibilityChanged(changedView, visibility); 1249 final int count = mChildrenCount; 1250 final View[] children = mChildren; 1251 for (int i = 0; i < count; i++) { 1252 children[i].dispatchVisibilityChanged(changedView, visibility); 1253 } 1254 } 1255 1256 @Override 1257 public void dispatchWindowVisibilityChanged(int visibility) { 1258 super.dispatchWindowVisibilityChanged(visibility); 1259 final int count = mChildrenCount; 1260 final View[] children = mChildren; 1261 for (int i = 0; i < count; i++) { 1262 children[i].dispatchWindowVisibilityChanged(visibility); 1263 } 1264 } 1265 1266 @Override 1267 public void dispatchConfigurationChanged(Configuration newConfig) { 1268 super.dispatchConfigurationChanged(newConfig); 1269 final int count = mChildrenCount; 1270 final View[] children = mChildren; 1271 for (int i = 0; i < count; i++) { 1272 children[i].dispatchConfigurationChanged(newConfig); 1273 } 1274 } 1275 1276 @Override 1277 public void recomputeViewAttributes(View child) { 1278 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1279 ViewParent parent = mParent; 1280 if (parent != null) parent.recomputeViewAttributes(this); 1281 } 1282 } 1283 1284 @Override 1285 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1286 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1287 super.dispatchCollectViewAttributes(attachInfo, visibility); 1288 final int count = mChildrenCount; 1289 final View[] children = mChildren; 1290 for (int i = 0; i < count; i++) { 1291 final View child = children[i]; 1292 child.dispatchCollectViewAttributes(attachInfo, 1293 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1294 } 1295 } 1296 } 1297 1298 @Override 1299 public void bringChildToFront(View child) { 1300 final int index = indexOfChild(child); 1301 if (index >= 0) { 1302 removeFromArray(index); 1303 addInArray(child, mChildrenCount); 1304 child.mParent = this; 1305 requestLayout(); 1306 invalidate(); 1307 } 1308 } 1309 1310 private PointF getLocalPoint() { 1311 if (mLocalPoint == null) mLocalPoint = new PointF(); 1312 return mLocalPoint; 1313 } 1314 1315 // TODO: Write real docs 1316 @Override 1317 public boolean dispatchDragEvent(DragEvent event) { 1318 boolean retval = false; 1319 final float tx = event.mX; 1320 final float ty = event.mY; 1321 1322 ViewRootImpl root = getViewRootImpl(); 1323 1324 // Dispatch down the view hierarchy 1325 final PointF localPoint = getLocalPoint(); 1326 1327 switch (event.mAction) { 1328 case DragEvent.ACTION_DRAG_STARTED: { 1329 // clear state to recalculate which views we drag over 1330 mCurrentDragView = null; 1331 1332 // Set up our tracking of drag-started notifications 1333 mCurrentDragStartEvent = DragEvent.obtain(event); 1334 if (mChildrenInterestedInDrag == null) { 1335 mChildrenInterestedInDrag = new HashSet<View>(); 1336 } else { 1337 mChildrenInterestedInDrag.clear(); 1338 } 1339 1340 // Now dispatch down to our children, caching the responses 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.mPrivateFlags2 &= ~View.DRAG_MASK; 1346 if (child.getVisibility() == VISIBLE) { 1347 if (notifyChildOfDragStart(children[i])) { 1348 retval = true; 1349 } 1350 } 1351 } 1352 1353 // Notify itself of the drag start. 1354 mIsInterestedInDrag = super.dispatchDragEvent(event); 1355 if (mIsInterestedInDrag) { 1356 retval = true; 1357 } 1358 } break; 1359 1360 case DragEvent.ACTION_DRAG_ENDED: { 1361 // Release the bookkeeping now that the drag lifecycle has ended 1362 final HashSet<View> childrenInterestedInDrag = mChildrenInterestedInDrag; 1363 if (childrenInterestedInDrag != null) { 1364 for (View child : childrenInterestedInDrag) { 1365 // If a child was interested in the ongoing drag, it's told that it's over 1366 if (child.dispatchDragEvent(event)) { 1367 retval = true; 1368 } 1369 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1370 child.refreshDrawableState(); 1371 } 1372 childrenInterestedInDrag.clear(); 1373 } 1374 if (mCurrentDragStartEvent != null) { 1375 mCurrentDragStartEvent.recycle(); 1376 mCurrentDragStartEvent = null; 1377 } 1378 1379 if (mIsInterestedInDrag) { 1380 if (super.dispatchDragEvent(event)) { 1381 retval = true; 1382 } 1383 mIsInterestedInDrag = false; 1384 } 1385 } break; 1386 1387 case DragEvent.ACTION_DRAG_LOCATION: { 1388 // Find the [possibly new] drag target 1389 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1390 if (target == null && mIsInterestedInDrag) { 1391 target = this; 1392 } 1393 1394 // If we've changed apparent drag target, tell the view root which view 1395 // we're over now [for purposes of the eventual drag-recipient-changed 1396 // notifications to the framework] and tell the new target that the drag 1397 // has entered its bounds. The root will see setDragFocus() calls all 1398 // the way down to the final leaf view that is handling the LOCATION event 1399 // before reporting the new potential recipient to the framework. 1400 if (mCurrentDragView != target) { 1401 root.setDragFocus(target); 1402 1403 final int action = event.mAction; 1404 // If we've dragged off of a child view or this window, send it the EXITED message 1405 if (mCurrentDragView != null) { 1406 final View view = mCurrentDragView; 1407 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1408 if (view != this) { 1409 view.dispatchDragEvent(event); 1410 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1411 view.refreshDrawableState(); 1412 } else { 1413 super.dispatchDragEvent(event); 1414 } 1415 } 1416 1417 mCurrentDragView = target; 1418 1419 // If we've dragged over a new child view, send it the ENTERED message, otherwise 1420 // send it to this window. 1421 if (target != null) { 1422 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1423 if (target != this) { 1424 target.dispatchDragEvent(event); 1425 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1426 target.refreshDrawableState(); 1427 } else { 1428 super.dispatchDragEvent(event); 1429 } 1430 } 1431 event.mAction = action; // restore the event's original state 1432 } 1433 1434 // Dispatch the actual drag location notice, localized into its coordinates 1435 if (target != null) { 1436 if (target != this) { 1437 event.mX = localPoint.x; 1438 event.mY = localPoint.y; 1439 1440 retval = target.dispatchDragEvent(event); 1441 1442 event.mX = tx; 1443 event.mY = ty; 1444 } else { 1445 retval = super.dispatchDragEvent(event); 1446 } 1447 } 1448 } break; 1449 1450 /* Entered / exited dispatch 1451 * 1452 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1453 * that we're about to get the corresponding LOCATION event, which we will use to 1454 * determine which of our children is the new target; at that point we will 1455 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1456 * If no suitable child is detected, dispatch to this window. 1457 * 1458 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1459 * drag has left this ViewGroup, we know by definition that every contained subview 1460 * is also no longer under the drag point. 1461 */ 1462 1463 case DragEvent.ACTION_DRAG_EXITED: { 1464 if (mCurrentDragView != null) { 1465 final View view = mCurrentDragView; 1466 if (view != this) { 1467 view.dispatchDragEvent(event); 1468 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1469 view.refreshDrawableState(); 1470 } else { 1471 super.dispatchDragEvent(event); 1472 } 1473 1474 mCurrentDragView = null; 1475 } 1476 } break; 1477 1478 case DragEvent.ACTION_DROP: { 1479 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1480 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1481 if (target != null) { 1482 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1483 event.mX = localPoint.x; 1484 event.mY = localPoint.y; 1485 retval = target.dispatchDragEvent(event); 1486 event.mX = tx; 1487 event.mY = ty; 1488 } else if (mIsInterestedInDrag) { 1489 retval = super.dispatchDragEvent(event); 1490 } else { 1491 if (ViewDebug.DEBUG_DRAG) { 1492 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1493 } 1494 } 1495 } break; 1496 } 1497 1498 return retval; 1499 } 1500 1501 // Find the frontmost child view that lies under the given point, and calculate 1502 // the position within its own local coordinate system. 1503 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1504 final int count = mChildrenCount; 1505 final View[] children = mChildren; 1506 for (int i = count - 1; i >= 0; i--) { 1507 final View child = children[i]; 1508 if (!child.canAcceptDrag()) { 1509 continue; 1510 } 1511 1512 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1513 return child; 1514 } 1515 } 1516 return null; 1517 } 1518 1519 boolean notifyChildOfDragStart(View child) { 1520 // The caller guarantees that the child is not in mChildrenInterestedInDrag yet. 1521 1522 if (ViewDebug.DEBUG_DRAG) { 1523 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1524 } 1525 1526 final boolean canAccept = child.dispatchDragEvent(mCurrentDragStartEvent); 1527 if (canAccept) { 1528 mChildrenInterestedInDrag.add(child); 1529 if (!child.canAcceptDrag()) { 1530 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1531 child.refreshDrawableState(); 1532 } 1533 } 1534 return canAccept; 1535 } 1536 1537 @Override 1538 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1539 super.dispatchWindowSystemUiVisiblityChanged(visible); 1540 1541 final int count = mChildrenCount; 1542 final View[] children = mChildren; 1543 for (int i=0; i <count; i++) { 1544 final View child = children[i]; 1545 child.dispatchWindowSystemUiVisiblityChanged(visible); 1546 } 1547 } 1548 1549 @Override 1550 public void dispatchSystemUiVisibilityChanged(int visible) { 1551 super.dispatchSystemUiVisibilityChanged(visible); 1552 1553 final int count = mChildrenCount; 1554 final View[] children = mChildren; 1555 for (int i=0; i <count; i++) { 1556 final View child = children[i]; 1557 child.dispatchSystemUiVisibilityChanged(visible); 1558 } 1559 } 1560 1561 @Override 1562 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1563 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1564 1565 final int count = mChildrenCount; 1566 final View[] children = mChildren; 1567 for (int i=0; i <count; i++) { 1568 final View child = children[i]; 1569 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1570 } 1571 return changed; 1572 } 1573 1574 @Override 1575 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1576 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1577 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1578 return super.dispatchKeyEventPreIme(event); 1579 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1580 == PFLAG_HAS_BOUNDS) { 1581 return mFocused.dispatchKeyEventPreIme(event); 1582 } 1583 return false; 1584 } 1585 1586 @Override 1587 public boolean dispatchKeyEvent(KeyEvent event) { 1588 if (mInputEventConsistencyVerifier != null) { 1589 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1590 } 1591 1592 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1593 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1594 if (super.dispatchKeyEvent(event)) { 1595 return true; 1596 } 1597 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1598 == PFLAG_HAS_BOUNDS) { 1599 if (mFocused.dispatchKeyEvent(event)) { 1600 return true; 1601 } 1602 } 1603 1604 if (mInputEventConsistencyVerifier != null) { 1605 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1606 } 1607 return false; 1608 } 1609 1610 @Override 1611 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1612 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1613 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1614 return super.dispatchKeyShortcutEvent(event); 1615 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1616 == PFLAG_HAS_BOUNDS) { 1617 return mFocused.dispatchKeyShortcutEvent(event); 1618 } 1619 return false; 1620 } 1621 1622 @Override 1623 public boolean dispatchTrackballEvent(MotionEvent event) { 1624 if (mInputEventConsistencyVerifier != null) { 1625 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1626 } 1627 1628 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1629 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1630 if (super.dispatchTrackballEvent(event)) { 1631 return true; 1632 } 1633 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1634 == PFLAG_HAS_BOUNDS) { 1635 if (mFocused.dispatchTrackballEvent(event)) { 1636 return true; 1637 } 1638 } 1639 1640 if (mInputEventConsistencyVerifier != null) { 1641 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1642 } 1643 return false; 1644 } 1645 1646 @Override 1647 public PointerIcon getPointerIcon(MotionEvent event, float x, float y) { 1648 // Check what the child under the pointer says about the pointer. 1649 final int childrenCount = mChildrenCount; 1650 if (childrenCount != 0) { 1651 final ArrayList<View> preorderedList = buildOrderedChildList(); 1652 final boolean customOrder = preorderedList == null 1653 && isChildrenDrawingOrderEnabled(); 1654 final View[] children = mChildren; 1655 for (int i = childrenCount - 1; i >= 0; i--) { 1656 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1657 final View child = (preorderedList == null) 1658 ? children[childIndex] : preorderedList.get(childIndex); 1659 PointF point = getLocalPoint(); 1660 if (isTransformedTouchPointInView(x, y, child, point)) { 1661 final PointerIcon pointerIcon = child.getPointerIcon(event, point.x, point.y); 1662 if (pointerIcon != null) { 1663 return pointerIcon; 1664 } 1665 break; 1666 } 1667 } 1668 } 1669 1670 // The pointer is not a child or the child has no preferences, returning the default 1671 // implementation. 1672 return super.getPointerIcon(event, x, y); 1673 } 1674 1675 @SuppressWarnings({"ConstantConditions"}) 1676 @Override 1677 protected boolean dispatchHoverEvent(MotionEvent event) { 1678 final int action = event.getAction(); 1679 1680 // First check whether the view group wants to intercept the hover event. 1681 final boolean interceptHover = onInterceptHoverEvent(event); 1682 event.setAction(action); // restore action in case it was changed 1683 1684 MotionEvent eventNoHistory = event; 1685 boolean handled = false; 1686 1687 // Send events to the hovered children and build a new list of hover targets until 1688 // one is found that handles the event. 1689 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1690 mFirstHoverTarget = null; 1691 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1692 final float x = event.getX(); 1693 final float y = event.getY(); 1694 final int childrenCount = mChildrenCount; 1695 if (childrenCount != 0) { 1696 final ArrayList<View> preorderedList = buildOrderedChildList(); 1697 final boolean customOrder = preorderedList == null 1698 && isChildrenDrawingOrderEnabled(); 1699 final View[] children = mChildren; 1700 HoverTarget lastHoverTarget = null; 1701 for (int i = childrenCount - 1; i >= 0; i--) { 1702 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1703 final View child = (preorderedList == null) 1704 ? children[childIndex] : preorderedList.get(childIndex); 1705 if (!canViewReceivePointerEvents(child) 1706 || !isTransformedTouchPointInView(x, y, child, null)) { 1707 continue; 1708 } 1709 1710 // Obtain a hover target for this child. Dequeue it from the 1711 // old hover target list if the child was previously hovered. 1712 HoverTarget hoverTarget = firstOldHoverTarget; 1713 final boolean wasHovered; 1714 for (HoverTarget predecessor = null; ;) { 1715 if (hoverTarget == null) { 1716 hoverTarget = HoverTarget.obtain(child); 1717 wasHovered = false; 1718 break; 1719 } 1720 1721 if (hoverTarget.child == child) { 1722 if (predecessor != null) { 1723 predecessor.next = hoverTarget.next; 1724 } else { 1725 firstOldHoverTarget = hoverTarget.next; 1726 } 1727 hoverTarget.next = null; 1728 wasHovered = true; 1729 break; 1730 } 1731 1732 predecessor = hoverTarget; 1733 hoverTarget = hoverTarget.next; 1734 } 1735 1736 // Enqueue the hover target onto the new hover target list. 1737 if (lastHoverTarget != null) { 1738 lastHoverTarget.next = hoverTarget; 1739 } else { 1740 mFirstHoverTarget = hoverTarget; 1741 } 1742 lastHoverTarget = hoverTarget; 1743 1744 // Dispatch the event to the child. 1745 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1746 if (!wasHovered) { 1747 // Send the enter as is. 1748 handled |= dispatchTransformedGenericPointerEvent( 1749 event, child); // enter 1750 } 1751 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1752 if (!wasHovered) { 1753 // Synthesize an enter from a move. 1754 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1755 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1756 handled |= dispatchTransformedGenericPointerEvent( 1757 eventNoHistory, child); // enter 1758 eventNoHistory.setAction(action); 1759 1760 handled |= dispatchTransformedGenericPointerEvent( 1761 eventNoHistory, child); // move 1762 } else { 1763 // Send the move as is. 1764 handled |= dispatchTransformedGenericPointerEvent(event, child); 1765 } 1766 } 1767 if (handled) { 1768 break; 1769 } 1770 } 1771 if (preorderedList != null) preorderedList.clear(); 1772 } 1773 } 1774 1775 // Send exit events to all previously hovered children that are no longer hovered. 1776 while (firstOldHoverTarget != null) { 1777 final View child = firstOldHoverTarget.child; 1778 1779 // Exit the old hovered child. 1780 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1781 // Send the exit as is. 1782 handled |= dispatchTransformedGenericPointerEvent( 1783 event, child); // exit 1784 } else { 1785 // Synthesize an exit from a move or enter. 1786 // Ignore the result because hover focus has moved to a different view. 1787 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1788 dispatchTransformedGenericPointerEvent( 1789 event, child); // move 1790 } 1791 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1792 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1793 dispatchTransformedGenericPointerEvent( 1794 eventNoHistory, child); // exit 1795 eventNoHistory.setAction(action); 1796 } 1797 1798 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1799 firstOldHoverTarget.recycle(); 1800 firstOldHoverTarget = nextOldHoverTarget; 1801 } 1802 1803 // Send events to the view group itself if no children have handled it. 1804 boolean newHoveredSelf = !handled; 1805 if (newHoveredSelf == mHoveredSelf) { 1806 if (newHoveredSelf) { 1807 // Send event to the view group as before. 1808 handled |= super.dispatchHoverEvent(event); 1809 } 1810 } else { 1811 if (mHoveredSelf) { 1812 // Exit the view group. 1813 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1814 // Send the exit as is. 1815 handled |= super.dispatchHoverEvent(event); // exit 1816 } else { 1817 // Synthesize an exit from a move or enter. 1818 // Ignore the result because hover focus is moving to a different view. 1819 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1820 super.dispatchHoverEvent(event); // move 1821 } 1822 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1823 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1824 super.dispatchHoverEvent(eventNoHistory); // exit 1825 eventNoHistory.setAction(action); 1826 } 1827 mHoveredSelf = false; 1828 } 1829 1830 if (newHoveredSelf) { 1831 // Enter the view group. 1832 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1833 // Send the enter as is. 1834 handled |= super.dispatchHoverEvent(event); // enter 1835 mHoveredSelf = true; 1836 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1837 // Synthesize an enter from a move. 1838 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1839 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1840 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1841 eventNoHistory.setAction(action); 1842 1843 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1844 mHoveredSelf = true; 1845 } 1846 } 1847 } 1848 1849 // Recycle the copy of the event that we made. 1850 if (eventNoHistory != event) { 1851 eventNoHistory.recycle(); 1852 } 1853 1854 // Done. 1855 return handled; 1856 } 1857 1858 private void exitHoverTargets() { 1859 if (mHoveredSelf || mFirstHoverTarget != null) { 1860 final long now = SystemClock.uptimeMillis(); 1861 MotionEvent event = MotionEvent.obtain(now, now, 1862 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1863 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1864 dispatchHoverEvent(event); 1865 event.recycle(); 1866 } 1867 } 1868 1869 private void cancelHoverTarget(View view) { 1870 HoverTarget predecessor = null; 1871 HoverTarget target = mFirstHoverTarget; 1872 while (target != null) { 1873 final HoverTarget next = target.next; 1874 if (target.child == view) { 1875 if (predecessor == null) { 1876 mFirstHoverTarget = next; 1877 } else { 1878 predecessor.next = next; 1879 } 1880 target.recycle(); 1881 1882 final long now = SystemClock.uptimeMillis(); 1883 MotionEvent event = MotionEvent.obtain(now, now, 1884 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1885 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1886 view.dispatchHoverEvent(event); 1887 event.recycle(); 1888 return; 1889 } 1890 predecessor = target; 1891 target = next; 1892 } 1893 } 1894 1895 /** @hide */ 1896 @Override 1897 protected boolean hasHoveredChild() { 1898 return mFirstHoverTarget != null; 1899 } 1900 1901 @Override 1902 public void addChildrenForAccessibility(ArrayList<View> outChildren) { 1903 if (getAccessibilityNodeProvider() != null) { 1904 return; 1905 } 1906 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1907 try { 1908 final int childrenCount = children.getChildCount(); 1909 for (int i = 0; i < childrenCount; i++) { 1910 View child = children.getChildAt(i); 1911 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1912 if (child.includeForAccessibility()) { 1913 outChildren.add(child); 1914 } else { 1915 child.addChildrenForAccessibility(outChildren); 1916 } 1917 } 1918 } 1919 } finally { 1920 children.recycle(); 1921 } 1922 } 1923 1924 /** 1925 * Implement this method to intercept hover events before they are handled 1926 * by child views. 1927 * <p> 1928 * This method is called before dispatching a hover event to a child of 1929 * the view group or to the view group's own {@link #onHoverEvent} to allow 1930 * the view group a chance to intercept the hover event. 1931 * This method can also be used to watch all pointer motions that occur within 1932 * the bounds of the view group even when the pointer is hovering over 1933 * a child of the view group rather than over the view group itself. 1934 * </p><p> 1935 * The view group can prevent its children from receiving hover events by 1936 * implementing this method and returning <code>true</code> to indicate 1937 * that it would like to intercept hover events. The view group must 1938 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1939 * for as long as it wishes to continue intercepting hover events from 1940 * its children. 1941 * </p><p> 1942 * Interception preserves the invariant that at most one view can be 1943 * hovered at a time by transferring hover focus from the currently hovered 1944 * child to the view group or vice-versa as needed. 1945 * </p><p> 1946 * If this method returns <code>true</code> and a child is already hovered, then the 1947 * child view will first receive a hover exit event and then the view group 1948 * itself will receive a hover enter event in {@link #onHoverEvent}. 1949 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1950 * events and instead returns <code>false</code> while the pointer is hovering 1951 * within the bounds of one of a child, then the view group will first receive a 1952 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1953 * receive a hover enter event. 1954 * </p><p> 1955 * The default implementation always returns false. 1956 * </p> 1957 * 1958 * @param event The motion event that describes the hover. 1959 * @return True if the view group would like to intercept the hover event 1960 * and prevent its children from receiving it. 1961 */ 1962 public boolean onInterceptHoverEvent(MotionEvent event) { 1963 return false; 1964 } 1965 1966 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1967 if (event.getHistorySize() == 0) { 1968 return event; 1969 } 1970 return MotionEvent.obtainNoHistory(event); 1971 } 1972 1973 @Override 1974 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1975 // Send the event to the child under the pointer. 1976 final int childrenCount = mChildrenCount; 1977 if (childrenCount != 0) { 1978 final float x = event.getX(); 1979 final float y = event.getY(); 1980 1981 final ArrayList<View> preorderedList = buildOrderedChildList(); 1982 final boolean customOrder = preorderedList == null 1983 && isChildrenDrawingOrderEnabled(); 1984 final View[] children = mChildren; 1985 for (int i = childrenCount - 1; i >= 0; i--) { 1986 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1987 final View child = (preorderedList == null) 1988 ? children[childIndex] : preorderedList.get(childIndex); 1989 if (!canViewReceivePointerEvents(child) 1990 || !isTransformedTouchPointInView(x, y, child, null)) { 1991 continue; 1992 } 1993 1994 if (dispatchTransformedGenericPointerEvent(event, child)) { 1995 if (preorderedList != null) preorderedList.clear(); 1996 return true; 1997 } 1998 } 1999 if (preorderedList != null) preorderedList.clear(); 2000 } 2001 2002 // No child handled the event. Send it to this view group. 2003 return super.dispatchGenericPointerEvent(event); 2004 } 2005 2006 @Override 2007 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 2008 // Send the event to the focused child or to this view group if it has focus. 2009 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 2010 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 2011 return super.dispatchGenericFocusedEvent(event); 2012 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 2013 == PFLAG_HAS_BOUNDS) { 2014 return mFocused.dispatchGenericMotionEvent(event); 2015 } 2016 return false; 2017 } 2018 2019 /** 2020 * Dispatches a generic pointer event to a child, taking into account 2021 * transformations that apply to the child. 2022 * 2023 * @param event The event to send. 2024 * @param child The view to send the event to. 2025 * @return {@code true} if the child handled the event. 2026 */ 2027 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 2028 final float offsetX = mScrollX - child.mLeft; 2029 final float offsetY = mScrollY - child.mTop; 2030 2031 boolean handled; 2032 if (!child.hasIdentityMatrix()) { 2033 MotionEvent transformedEvent = MotionEvent.obtain(event); 2034 transformedEvent.offsetLocation(offsetX, offsetY); 2035 transformedEvent.transform(child.getInverseMatrix()); 2036 handled = child.dispatchGenericMotionEvent(transformedEvent); 2037 transformedEvent.recycle(); 2038 } else { 2039 event.offsetLocation(offsetX, offsetY); 2040 handled = child.dispatchGenericMotionEvent(event); 2041 event.offsetLocation(-offsetX, -offsetY); 2042 } 2043 return handled; 2044 } 2045 2046 @Override 2047 public boolean dispatchTouchEvent(MotionEvent ev) { 2048 if (mInputEventConsistencyVerifier != null) { 2049 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 2050 } 2051 2052 // If the event targets the accessibility focused view and this is it, start 2053 // normal event dispatch. Maybe a descendant is what will handle the click. 2054 if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) { 2055 ev.setTargetAccessibilityFocus(false); 2056 } 2057 2058 boolean handled = false; 2059 if (onFilterTouchEventForSecurity(ev)) { 2060 final int action = ev.getAction(); 2061 final int actionMasked = action & MotionEvent.ACTION_MASK; 2062 2063 // Handle an initial down. 2064 if (actionMasked == MotionEvent.ACTION_DOWN) { 2065 // Throw away all previous state when starting a new touch gesture. 2066 // The framework may have dropped the up or cancel event for the previous gesture 2067 // due to an app switch, ANR, or some other state change. 2068 cancelAndClearTouchTargets(ev); 2069 resetTouchState(); 2070 } 2071 2072 // Check for interception. 2073 final boolean intercepted; 2074 if (actionMasked == MotionEvent.ACTION_DOWN 2075 || mFirstTouchTarget != null) { 2076 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 2077 if (!disallowIntercept) { 2078 intercepted = onInterceptTouchEvent(ev); 2079 ev.setAction(action); // restore action in case it was changed 2080 } else { 2081 intercepted = false; 2082 } 2083 } else { 2084 // There are no touch targets and this action is not an initial down 2085 // so this view group continues to intercept touches. 2086 intercepted = true; 2087 } 2088 2089 // If intercepted, start normal event dispatch. Also if there is already 2090 // a view that is handling the gesture, do normal event dispatch. 2091 if (intercepted || mFirstTouchTarget != null) { 2092 ev.setTargetAccessibilityFocus(false); 2093 } 2094 2095 // Check for cancelation. 2096 final boolean canceled = resetCancelNextUpFlag(this) 2097 || actionMasked == MotionEvent.ACTION_CANCEL; 2098 2099 // Update list of touch targets for pointer down, if needed. 2100 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 2101 TouchTarget newTouchTarget = null; 2102 boolean alreadyDispatchedToNewTouchTarget = false; 2103 if (!canceled && !intercepted) { 2104 2105 // If the event is targeting accessiiblity focus we give it to the 2106 // view that has accessibility focus and if it does not handle it 2107 // we clear the flag and dispatch the event to all children as usual. 2108 // We are looking up the accessibility focused host to avoid keeping 2109 // state since these events are very rare. 2110 View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus() 2111 ? findChildWithAccessibilityFocus() : null; 2112 2113 if (actionMasked == MotionEvent.ACTION_DOWN 2114 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 2115 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2116 final int actionIndex = ev.getActionIndex(); // always 0 for down 2117 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 2118 : TouchTarget.ALL_POINTER_IDS; 2119 2120 // Clean up earlier touch targets for this pointer id in case they 2121 // have become out of sync. 2122 removePointersFromTouchTargets(idBitsToAssign); 2123 2124 final int childrenCount = mChildrenCount; 2125 if (newTouchTarget == null && childrenCount != 0) { 2126 final float x = ev.getX(actionIndex); 2127 final float y = ev.getY(actionIndex); 2128 // Find a child that can receive the event. 2129 // Scan children from front to back. 2130 final ArrayList<View> preorderedList = buildTouchDispatchChildList(); 2131 final boolean customOrder = preorderedList == null 2132 && isChildrenDrawingOrderEnabled(); 2133 final View[] children = mChildren; 2134 for (int i = childrenCount - 1; i >= 0; i--) { 2135 final int childIndex = customOrder 2136 ? getChildDrawingOrder(childrenCount, i) : i; 2137 final View child = (preorderedList == null) 2138 ? children[childIndex] : preorderedList.get(childIndex); 2139 2140 // If there is a view that has accessibility focus we want it 2141 // to get the event first and if not handled we will perform a 2142 // normal dispatch. We may do a double iteration but this is 2143 // safer given the timeframe. 2144 if (childWithAccessibilityFocus != null) { 2145 if (childWithAccessibilityFocus != child) { 2146 continue; 2147 } 2148 childWithAccessibilityFocus = null; 2149 i = childrenCount - 1; 2150 } 2151 2152 if (!canViewReceivePointerEvents(child) 2153 || !isTransformedTouchPointInView(x, y, child, null)) { 2154 ev.setTargetAccessibilityFocus(false); 2155 continue; 2156 } 2157 2158 newTouchTarget = getTouchTarget(child); 2159 if (newTouchTarget != null) { 2160 // Child is already receiving touch within its bounds. 2161 // Give it the new pointer in addition to the ones it is handling. 2162 newTouchTarget.pointerIdBits |= idBitsToAssign; 2163 break; 2164 } 2165 2166 resetCancelNextUpFlag(child); 2167 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 2168 // Child wants to receive touch within its bounds. 2169 mLastTouchDownTime = ev.getDownTime(); 2170 if (preorderedList != null) { 2171 // childIndex points into presorted list, find original index 2172 for (int j = 0; j < childrenCount; j++) { 2173 if (children[childIndex] == mChildren[j]) { 2174 mLastTouchDownIndex = j; 2175 break; 2176 } 2177 } 2178 } else { 2179 mLastTouchDownIndex = childIndex; 2180 } 2181 mLastTouchDownX = ev.getX(); 2182 mLastTouchDownY = ev.getY(); 2183 newTouchTarget = addTouchTarget(child, idBitsToAssign); 2184 alreadyDispatchedToNewTouchTarget = true; 2185 break; 2186 } 2187 2188 // The accessibility focus didn't handle the event, so clear 2189 // the flag and do a normal dispatch to all children. 2190 ev.setTargetAccessibilityFocus(false); 2191 } 2192 if (preorderedList != null) preorderedList.clear(); 2193 } 2194 2195 if (newTouchTarget == null && mFirstTouchTarget != null) { 2196 // Did not find a child to receive the event. 2197 // Assign the pointer to the least recently added target. 2198 newTouchTarget = mFirstTouchTarget; 2199 while (newTouchTarget.next != null) { 2200 newTouchTarget = newTouchTarget.next; 2201 } 2202 newTouchTarget.pointerIdBits |= idBitsToAssign; 2203 } 2204 } 2205 } 2206 2207 // Dispatch to touch targets. 2208 if (mFirstTouchTarget == null) { 2209 // No touch targets so treat this as an ordinary view. 2210 handled = dispatchTransformedTouchEvent(ev, canceled, null, 2211 TouchTarget.ALL_POINTER_IDS); 2212 } else { 2213 // Dispatch to touch targets, excluding the new touch target if we already 2214 // dispatched to it. Cancel touch targets if necessary. 2215 TouchTarget predecessor = null; 2216 TouchTarget target = mFirstTouchTarget; 2217 while (target != null) { 2218 final TouchTarget next = target.next; 2219 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 2220 handled = true; 2221 } else { 2222 final boolean cancelChild = resetCancelNextUpFlag(target.child) 2223 || intercepted; 2224 if (dispatchTransformedTouchEvent(ev, cancelChild, 2225 target.child, target.pointerIdBits)) { 2226 handled = true; 2227 } 2228 if (cancelChild) { 2229 if (predecessor == null) { 2230 mFirstTouchTarget = next; 2231 } else { 2232 predecessor.next = next; 2233 } 2234 target.recycle(); 2235 target = next; 2236 continue; 2237 } 2238 } 2239 predecessor = target; 2240 target = next; 2241 } 2242 } 2243 2244 // Update list of touch targets for pointer up or cancel, if needed. 2245 if (canceled 2246 || actionMasked == MotionEvent.ACTION_UP 2247 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2248 resetTouchState(); 2249 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2250 final int actionIndex = ev.getActionIndex(); 2251 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2252 removePointersFromTouchTargets(idBitsToRemove); 2253 } 2254 } 2255 2256 if (!handled && mInputEventConsistencyVerifier != null) { 2257 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2258 } 2259 return handled; 2260 } 2261 2262 /** 2263 * Provide custom ordering of views in which the touch will be dispatched. 2264 * 2265 * This is called within a tight loop, so you are not allowed to allocate objects, including 2266 * the return array. Instead, you should return a pre-allocated list that will be cleared 2267 * after the dispatch is finished. 2268 * @hide 2269 */ 2270 public ArrayList<View> buildTouchDispatchChildList() { 2271 return buildOrderedChildList(); 2272 } 2273 2274 /** 2275 * Finds the child which has accessibility focus. 2276 * 2277 * @return The child that has focus. 2278 */ 2279 private View findChildWithAccessibilityFocus() { 2280 ViewRootImpl viewRoot = getViewRootImpl(); 2281 if (viewRoot == null) { 2282 return null; 2283 } 2284 2285 View current = viewRoot.getAccessibilityFocusedHost(); 2286 if (current == null) { 2287 return null; 2288 } 2289 2290 ViewParent parent = current.getParent(); 2291 while (parent instanceof View) { 2292 if (parent == this) { 2293 return current; 2294 } 2295 current = (View) parent; 2296 parent = current.getParent(); 2297 } 2298 2299 return null; 2300 } 2301 2302 /** 2303 * Resets all touch state in preparation for a new cycle. 2304 */ 2305 private void resetTouchState() { 2306 clearTouchTargets(); 2307 resetCancelNextUpFlag(this); 2308 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2309 mNestedScrollAxes = SCROLL_AXIS_NONE; 2310 } 2311 2312 /** 2313 * Resets the cancel next up flag. 2314 * Returns true if the flag was previously set. 2315 */ 2316 private static boolean resetCancelNextUpFlag(View view) { 2317 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2318 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2319 return true; 2320 } 2321 return false; 2322 } 2323 2324 /** 2325 * Clears all touch targets. 2326 */ 2327 private void clearTouchTargets() { 2328 TouchTarget target = mFirstTouchTarget; 2329 if (target != null) { 2330 do { 2331 TouchTarget next = target.next; 2332 target.recycle(); 2333 target = next; 2334 } while (target != null); 2335 mFirstTouchTarget = null; 2336 } 2337 } 2338 2339 /** 2340 * Cancels and clears all touch targets. 2341 */ 2342 private void cancelAndClearTouchTargets(MotionEvent event) { 2343 if (mFirstTouchTarget != null) { 2344 boolean syntheticEvent = false; 2345 if (event == null) { 2346 final long now = SystemClock.uptimeMillis(); 2347 event = MotionEvent.obtain(now, now, 2348 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2349 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2350 syntheticEvent = true; 2351 } 2352 2353 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2354 resetCancelNextUpFlag(target.child); 2355 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2356 } 2357 clearTouchTargets(); 2358 2359 if (syntheticEvent) { 2360 event.recycle(); 2361 } 2362 } 2363 } 2364 2365 /** 2366 * Gets the touch target for specified child view. 2367 * Returns null if not found. 2368 */ 2369 private TouchTarget getTouchTarget(View child) { 2370 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2371 if (target.child == child) { 2372 return target; 2373 } 2374 } 2375 return null; 2376 } 2377 2378 /** 2379 * Adds a touch target for specified child to the beginning of the list. 2380 * Assumes the target child is not already present. 2381 */ 2382 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2383 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2384 target.next = mFirstTouchTarget; 2385 mFirstTouchTarget = target; 2386 return target; 2387 } 2388 2389 /** 2390 * Removes the pointer ids from consideration. 2391 */ 2392 private void removePointersFromTouchTargets(int pointerIdBits) { 2393 TouchTarget predecessor = null; 2394 TouchTarget target = mFirstTouchTarget; 2395 while (target != null) { 2396 final TouchTarget next = target.next; 2397 if ((target.pointerIdBits & pointerIdBits) != 0) { 2398 target.pointerIdBits &= ~pointerIdBits; 2399 if (target.pointerIdBits == 0) { 2400 if (predecessor == null) { 2401 mFirstTouchTarget = next; 2402 } else { 2403 predecessor.next = next; 2404 } 2405 target.recycle(); 2406 target = next; 2407 continue; 2408 } 2409 } 2410 predecessor = target; 2411 target = next; 2412 } 2413 } 2414 2415 private void cancelTouchTarget(View view) { 2416 TouchTarget predecessor = null; 2417 TouchTarget target = mFirstTouchTarget; 2418 while (target != null) { 2419 final TouchTarget next = target.next; 2420 if (target.child == view) { 2421 if (predecessor == null) { 2422 mFirstTouchTarget = next; 2423 } else { 2424 predecessor.next = next; 2425 } 2426 target.recycle(); 2427 2428 final long now = SystemClock.uptimeMillis(); 2429 MotionEvent event = MotionEvent.obtain(now, now, 2430 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2431 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2432 view.dispatchTouchEvent(event); 2433 event.recycle(); 2434 return; 2435 } 2436 predecessor = target; 2437 target = next; 2438 } 2439 } 2440 2441 /** 2442 * Returns true if a child view can receive pointer events. 2443 * @hide 2444 */ 2445 private static boolean canViewReceivePointerEvents(View child) { 2446 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2447 || child.getAnimation() != null; 2448 } 2449 2450 private float[] getTempPoint() { 2451 if (mTempPoint == null) { 2452 mTempPoint = new float[2]; 2453 } 2454 return mTempPoint; 2455 } 2456 2457 /** 2458 * Returns true if a child view contains the specified point when transformed 2459 * into its coordinate space. 2460 * Child must not be null. 2461 * @hide 2462 */ 2463 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2464 PointF outLocalPoint) { 2465 final float[] point = getTempPoint(); 2466 point[0] = x; 2467 point[1] = y; 2468 transformPointToViewLocal(point, child); 2469 final boolean isInView = child.pointInView(point[0], point[1]); 2470 if (isInView && outLocalPoint != null) { 2471 outLocalPoint.set(point[0], point[1]); 2472 } 2473 return isInView; 2474 } 2475 2476 /** 2477 * @hide 2478 */ 2479 public void transformPointToViewLocal(float[] point, View child) { 2480 point[0] += mScrollX - child.mLeft; 2481 point[1] += mScrollY - child.mTop; 2482 2483 if (!child.hasIdentityMatrix()) { 2484 child.getInverseMatrix().mapPoints(point); 2485 } 2486 } 2487 2488 /** 2489 * Transforms a motion event into the coordinate space of a particular child view, 2490 * filters out irrelevant pointer ids, and overrides its action if necessary. 2491 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2492 */ 2493 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2494 View child, int desiredPointerIdBits) { 2495 final boolean handled; 2496 2497 // Canceling motions is a special case. We don't need to perform any transformations 2498 // or filtering. The important part is the action, not the contents. 2499 final int oldAction = event.getAction(); 2500 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2501 event.setAction(MotionEvent.ACTION_CANCEL); 2502 if (child == null) { 2503 handled = super.dispatchTouchEvent(event); 2504 } else { 2505 handled = child.dispatchTouchEvent(event); 2506 } 2507 event.setAction(oldAction); 2508 return handled; 2509 } 2510 2511 // Calculate the number of pointers to deliver. 2512 final int oldPointerIdBits = event.getPointerIdBits(); 2513 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2514 2515 // If for some reason we ended up in an inconsistent state where it looks like we 2516 // might produce a motion event with no pointers in it, then drop the event. 2517 if (newPointerIdBits == 0) { 2518 return false; 2519 } 2520 2521 // If the number of pointers is the same and we don't need to perform any fancy 2522 // irreversible transformations, then we can reuse the motion event for this 2523 // dispatch as long as we are careful to revert any changes we make. 2524 // Otherwise we need to make a copy. 2525 final MotionEvent transformedEvent; 2526 if (newPointerIdBits == oldPointerIdBits) { 2527 if (child == null || child.hasIdentityMatrix()) { 2528 if (child == null) { 2529 handled = super.dispatchTouchEvent(event); 2530 } else { 2531 final float offsetX = mScrollX - child.mLeft; 2532 final float offsetY = mScrollY - child.mTop; 2533 event.offsetLocation(offsetX, offsetY); 2534 2535 handled = child.dispatchTouchEvent(event); 2536 2537 event.offsetLocation(-offsetX, -offsetY); 2538 } 2539 return handled; 2540 } 2541 transformedEvent = MotionEvent.obtain(event); 2542 } else { 2543 transformedEvent = event.split(newPointerIdBits); 2544 } 2545 2546 // Perform any necessary transformations and dispatch. 2547 if (child == null) { 2548 handled = super.dispatchTouchEvent(transformedEvent); 2549 } else { 2550 final float offsetX = mScrollX - child.mLeft; 2551 final float offsetY = mScrollY - child.mTop; 2552 transformedEvent.offsetLocation(offsetX, offsetY); 2553 if (! child.hasIdentityMatrix()) { 2554 transformedEvent.transform(child.getInverseMatrix()); 2555 } 2556 2557 handled = child.dispatchTouchEvent(transformedEvent); 2558 } 2559 2560 // Done. 2561 transformedEvent.recycle(); 2562 return handled; 2563 } 2564 2565 /** 2566 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2567 * dispatch. This behavior is enabled by default for applications that target an 2568 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2569 * 2570 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2571 * views depending on where each pointer initially went down. This allows for user interactions 2572 * such as scrolling two panes of content independently, chording of buttons, and performing 2573 * independent gestures on different pieces of content. 2574 * 2575 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2576 * child views. <code>false</code> to only allow one child view to be the target of 2577 * any MotionEvent received by this ViewGroup. 2578 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2579 */ 2580 public void setMotionEventSplittingEnabled(boolean split) { 2581 // TODO Applications really shouldn't change this setting mid-touch event, 2582 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2583 // with gestures in progress when this is changed. 2584 if (split) { 2585 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2586 } else { 2587 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2588 } 2589 } 2590 2591 /** 2592 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2593 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2594 */ 2595 public boolean isMotionEventSplittingEnabled() { 2596 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2597 } 2598 2599 /** 2600 * Returns true if this ViewGroup should be considered as a single entity for removal 2601 * when executing an Activity transition. If this is false, child elements will move 2602 * individually during the transition. 2603 * 2604 * @return True if the ViewGroup should be acted on together during an Activity transition. 2605 * The default value is true when there is a non-null background or if 2606 * {@link #getTransitionName()} is not null or if a 2607 * non-null {@link android.view.ViewOutlineProvider} other than 2608 * {@link android.view.ViewOutlineProvider#BACKGROUND} was given to 2609 * {@link #setOutlineProvider(ViewOutlineProvider)} and false otherwise. 2610 */ 2611 public boolean isTransitionGroup() { 2612 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2613 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2614 } else { 2615 final ViewOutlineProvider outlineProvider = getOutlineProvider(); 2616 return getBackground() != null || getTransitionName() != null || 2617 (outlineProvider != null && outlineProvider != ViewOutlineProvider.BACKGROUND); 2618 } 2619 } 2620 2621 /** 2622 * Changes whether or not this ViewGroup should be treated as a single entity during 2623 * Activity Transitions. 2624 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2625 * in Activity transitions. If false, the ViewGroup won't transition, 2626 * only its children. If true, the entire ViewGroup will transition 2627 * together. 2628 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity, 2629 * android.util.Pair[]) 2630 */ 2631 public void setTransitionGroup(boolean isTransitionGroup) { 2632 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2633 if (isTransitionGroup) { 2634 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2635 } else { 2636 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2637 } 2638 } 2639 2640 @Override 2641 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2642 2643 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2644 // We're already in this state, assume our ancestors are too 2645 return; 2646 } 2647 2648 if (disallowIntercept) { 2649 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2650 } else { 2651 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2652 } 2653 2654 // Pass it up to our parent 2655 if (mParent != null) { 2656 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2657 } 2658 } 2659 2660 /** 2661 * Implement this method to intercept all touch screen motion events. This 2662 * allows you to watch events as they are dispatched to your children, and 2663 * take ownership of the current gesture at any point. 2664 * 2665 * <p>Using this function takes some care, as it has a fairly complicated 2666 * interaction with {@link View#onTouchEvent(MotionEvent) 2667 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2668 * that method as well as this one in the correct way. Events will be 2669 * received in the following order: 2670 * 2671 * <ol> 2672 * <li> You will receive the down event here. 2673 * <li> The down event will be handled either by a child of this view 2674 * group, or given to your own onTouchEvent() method to handle; this means 2675 * you should implement onTouchEvent() to return true, so you will 2676 * continue to see the rest of the gesture (instead of looking for 2677 * a parent view to handle it). Also, by returning true from 2678 * onTouchEvent(), you will not receive any following 2679 * events in onInterceptTouchEvent() and all touch processing must 2680 * happen in onTouchEvent() like normal. 2681 * <li> For as long as you return false from this function, each following 2682 * event (up to and including the final up) will be delivered first here 2683 * and then to the target's onTouchEvent(). 2684 * <li> If you return true from here, you will not receive any 2685 * following events: the target view will receive the same event but 2686 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2687 * events will be delivered to your onTouchEvent() method and no longer 2688 * appear here. 2689 * </ol> 2690 * 2691 * @param ev The motion event being dispatched down the hierarchy. 2692 * @return Return true to steal motion events from the children and have 2693 * them dispatched to this ViewGroup through onTouchEvent(). 2694 * The current target will receive an ACTION_CANCEL event, and no further 2695 * messages will be delivered here. 2696 */ 2697 public boolean onInterceptTouchEvent(MotionEvent ev) { 2698 return false; 2699 } 2700 2701 /** 2702 * {@inheritDoc} 2703 * 2704 * Looks for a view to give focus to respecting the setting specified by 2705 * {@link #getDescendantFocusability()}. 2706 * 2707 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2708 * find focus within the children of this group when appropriate. 2709 * 2710 * @see #FOCUS_BEFORE_DESCENDANTS 2711 * @see #FOCUS_AFTER_DESCENDANTS 2712 * @see #FOCUS_BLOCK_DESCENDANTS 2713 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2714 */ 2715 @Override 2716 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2717 if (DBG) { 2718 System.out.println(this + " ViewGroup.requestFocus direction=" 2719 + direction); 2720 } 2721 int descendantFocusability = getDescendantFocusability(); 2722 2723 switch (descendantFocusability) { 2724 case FOCUS_BLOCK_DESCENDANTS: 2725 return super.requestFocus(direction, previouslyFocusedRect); 2726 case FOCUS_BEFORE_DESCENDANTS: { 2727 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2728 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2729 } 2730 case FOCUS_AFTER_DESCENDANTS: { 2731 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2732 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2733 } 2734 default: 2735 throw new IllegalStateException("descendant focusability must be " 2736 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2737 + "but is " + descendantFocusability); 2738 } 2739 } 2740 2741 /** 2742 * Look for a descendant to call {@link View#requestFocus} on. 2743 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2744 * when it wants to request focus within its children. Override this to 2745 * customize how your {@link ViewGroup} requests focus within its children. 2746 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2747 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2748 * to give a finer grained hint about where focus is coming from. May be null 2749 * if there is no hint. 2750 * @return Whether focus was taken. 2751 */ 2752 @SuppressWarnings({"ConstantConditions"}) 2753 protected boolean onRequestFocusInDescendants(int direction, 2754 Rect previouslyFocusedRect) { 2755 int index; 2756 int increment; 2757 int end; 2758 int count = mChildrenCount; 2759 if ((direction & FOCUS_FORWARD) != 0) { 2760 index = 0; 2761 increment = 1; 2762 end = count; 2763 } else { 2764 index = count - 1; 2765 increment = -1; 2766 end = -1; 2767 } 2768 final View[] children = mChildren; 2769 for (int i = index; i != end; i += increment) { 2770 View child = children[i]; 2771 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2772 if (child.requestFocus(direction, previouslyFocusedRect)) { 2773 return true; 2774 } 2775 } 2776 } 2777 return false; 2778 } 2779 2780 /** 2781 * {@inheritDoc} 2782 * 2783 * @hide 2784 */ 2785 @Override 2786 public void dispatchStartTemporaryDetach() { 2787 super.dispatchStartTemporaryDetach(); 2788 final int count = mChildrenCount; 2789 final View[] children = mChildren; 2790 for (int i = 0; i < count; i++) { 2791 children[i].dispatchStartTemporaryDetach(); 2792 } 2793 } 2794 2795 /** 2796 * {@inheritDoc} 2797 * 2798 * @hide 2799 */ 2800 @Override 2801 public void dispatchFinishTemporaryDetach() { 2802 super.dispatchFinishTemporaryDetach(); 2803 final int count = mChildrenCount; 2804 final View[] children = mChildren; 2805 for (int i = 0; i < count; i++) { 2806 children[i].dispatchFinishTemporaryDetach(); 2807 } 2808 } 2809 2810 @Override 2811 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2812 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2813 super.dispatchAttachedToWindow(info, visibility); 2814 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2815 2816 final int count = mChildrenCount; 2817 final View[] children = mChildren; 2818 for (int i = 0; i < count; i++) { 2819 final View child = children[i]; 2820 child.dispatchAttachedToWindow(info, 2821 combineVisibility(visibility, child.getVisibility())); 2822 } 2823 final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 2824 for (int i = 0; i < transientCount; ++i) { 2825 View view = mTransientViews.get(i); 2826 view.dispatchAttachedToWindow(info, 2827 combineVisibility(visibility, view.getVisibility())); 2828 } 2829 } 2830 2831 @Override 2832 void dispatchScreenStateChanged(int screenState) { 2833 super.dispatchScreenStateChanged(screenState); 2834 2835 final int count = mChildrenCount; 2836 final View[] children = mChildren; 2837 for (int i = 0; i < count; i++) { 2838 children[i].dispatchScreenStateChanged(screenState); 2839 } 2840 } 2841 2842 /** @hide */ 2843 @Override 2844 public boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2845 boolean handled = false; 2846 if (includeForAccessibility()) { 2847 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2848 if (handled) { 2849 return handled; 2850 } 2851 } 2852 // Let our children have a shot in populating the event. 2853 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2854 try { 2855 final int childCount = children.getChildCount(); 2856 for (int i = 0; i < childCount; i++) { 2857 View child = children.getChildAt(i); 2858 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2859 handled = child.dispatchPopulateAccessibilityEvent(event); 2860 if (handled) { 2861 return handled; 2862 } 2863 } 2864 } 2865 } finally { 2866 children.recycle(); 2867 } 2868 return false; 2869 } 2870 2871 /** 2872 * Dispatch creation of {@link ViewStructure} down the hierarchy. This implementation 2873 * adds in all child views of the view group, in addition to calling the default View 2874 * implementation. 2875 */ 2876 @Override 2877 public void dispatchProvideStructure(ViewStructure structure) { 2878 super.dispatchProvideStructure(structure); 2879 if (!isAssistBlocked()) { 2880 if (structure.getChildCount() == 0) { 2881 final int childrenCount = getChildCount(); 2882 if (childrenCount > 0) { 2883 structure.setChildCount(childrenCount); 2884 ArrayList<View> preorderedList = buildOrderedChildList(); 2885 boolean customOrder = preorderedList == null 2886 && isChildrenDrawingOrderEnabled(); 2887 final View[] children = mChildren; 2888 for (int i=0; i<childrenCount; i++) { 2889 int childIndex; 2890 try { 2891 childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 2892 } catch (IndexOutOfBoundsException e) { 2893 childIndex = i; 2894 if (mContext.getApplicationInfo().targetSdkVersion 2895 < Build.VERSION_CODES.M) { 2896 Log.w(TAG, "Bad getChildDrawingOrder while collecting assist @ " 2897 + i + " of " + childrenCount, e); 2898 // At least one app is failing when we call getChildDrawingOrder 2899 // at this point, so deal semi-gracefully with it by falling back 2900 // on the basic order. 2901 customOrder = false; 2902 if (i > 0) { 2903 // If we failed at the first index, there really isn't 2904 // anything to do -- we will just proceed with the simple 2905 // sequence order. 2906 // Otherwise, we failed in the middle, so need to come up 2907 // with an order for the remaining indices and use that. 2908 // Failed at the first one, easy peasy. 2909 int[] permutation = new int[childrenCount]; 2910 SparseBooleanArray usedIndices = new SparseBooleanArray(); 2911 // Go back and collected the indices we have done so far. 2912 for (int j=0; j<i; j++) { 2913 permutation[j] = getChildDrawingOrder(childrenCount, j); 2914 usedIndices.put(permutation[j], true); 2915 } 2916 // Fill in the remaining indices with indices that have not 2917 // yet been used. 2918 int nextIndex = 0; 2919 for (int j=i; j<childrenCount; j++) { 2920 while (usedIndices.get(nextIndex, false)) { 2921 nextIndex++; 2922 } 2923 permutation[j] = nextIndex; 2924 nextIndex++; 2925 } 2926 // Build the final view list. 2927 preorderedList = new ArrayList<>(childrenCount); 2928 for (int j=0; j<childrenCount; j++) { 2929 preorderedList.add(children[permutation[j]]); 2930 } 2931 } 2932 } else { 2933 throw e; 2934 } 2935 } 2936 final View child = (preorderedList == null) 2937 ? children[childIndex] : preorderedList.get(childIndex); 2938 ViewStructure cstructure = structure.newChild(i); 2939 child.dispatchProvideStructure(cstructure); 2940 } 2941 } 2942 } 2943 } 2944 } 2945 2946 /** @hide */ 2947 @Override 2948 public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2949 super.onInitializeAccessibilityNodeInfoInternal(info); 2950 if (getAccessibilityNodeProvider() != null) { 2951 return; 2952 } 2953 if (mAttachInfo != null) { 2954 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2955 childrenForAccessibility.clear(); 2956 addChildrenForAccessibility(childrenForAccessibility); 2957 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2958 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2959 final View child = childrenForAccessibility.get(i); 2960 info.addChildUnchecked(child); 2961 } 2962 childrenForAccessibility.clear(); 2963 } 2964 } 2965 2966 @Override 2967 public CharSequence getAccessibilityClassName() { 2968 return ViewGroup.class.getName(); 2969 } 2970 2971 @Override 2972 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2973 // If this is a live region, we should send a subtree change event 2974 // from this view. Otherwise, we can let it propagate up. 2975 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2976 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2977 } else if (mParent != null) { 2978 try { 2979 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2980 } catch (AbstractMethodError e) { 2981 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2982 " does not fully implement ViewParent", e); 2983 } 2984 } 2985 } 2986 2987 @Override 2988 void resetSubtreeAccessibilityStateChanged() { 2989 super.resetSubtreeAccessibilityStateChanged(); 2990 View[] children = mChildren; 2991 final int childCount = mChildrenCount; 2992 for (int i = 0; i < childCount; i++) { 2993 children[i].resetSubtreeAccessibilityStateChanged(); 2994 } 2995 } 2996 2997 /** 2998 * Counts the number of children of this View that will be sent to an accessibility service. 2999 * 3000 * @return The number of children an {@code AccessibilityNodeInfo} rooted at this View 3001 * would have. 3002 */ 3003 int getNumChildrenForAccessibility() { 3004 int numChildrenForAccessibility = 0; 3005 for (int i = 0; i < getChildCount(); i++) { 3006 View child = getChildAt(i); 3007 if (child.includeForAccessibility()) { 3008 numChildrenForAccessibility++; 3009 } else if (child instanceof ViewGroup) { 3010 numChildrenForAccessibility += ((ViewGroup) child) 3011 .getNumChildrenForAccessibility(); 3012 } 3013 } 3014 return numChildrenForAccessibility; 3015 } 3016 3017 /** 3018 * {@inheritDoc} 3019 * 3020 * <p>Subclasses should always call <code>super.onNestedPrePerformAccessibilityAction</code></p> 3021 * 3022 * @param target The target view dispatching this action 3023 * @param action Action being performed; see 3024 * {@link android.view.accessibility.AccessibilityNodeInfo} 3025 * @param args Optional action arguments 3026 * @return false by default. Subclasses should return true if they handle the event. 3027 */ 3028 @Override 3029 public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle args) { 3030 return false; 3031 } 3032 3033 @Override 3034 void dispatchDetachedFromWindow() { 3035 // If we still have a touch target, we are still in the process of 3036 // dispatching motion events to a child; we need to get rid of that 3037 // child to avoid dispatching events to it after the window is torn 3038 // down. To make sure we keep the child in a consistent state, we 3039 // first send it an ACTION_CANCEL motion event. 3040 cancelAndClearTouchTargets(null); 3041 3042 // Similarly, set ACTION_EXIT to all hover targets and clear them. 3043 exitHoverTargets(); 3044 3045 // In case view is detached while transition is running 3046 mLayoutCalledWhileSuppressed = false; 3047 3048 // Tear down our drag tracking 3049 mChildrenInterestedInDrag = null; 3050 mIsInterestedInDrag = false; 3051 if (mCurrentDragStartEvent != null) { 3052 mCurrentDragStartEvent.recycle(); 3053 mCurrentDragStartEvent = null; 3054 } 3055 3056 final int count = mChildrenCount; 3057 final View[] children = mChildren; 3058 for (int i = 0; i < count; i++) { 3059 children[i].dispatchDetachedFromWindow(); 3060 } 3061 clearDisappearingChildren(); 3062 final int transientCount = mTransientViews == null ? 0 : mTransientIndices.size(); 3063 for (int i = 0; i < transientCount; ++i) { 3064 View view = mTransientViews.get(i); 3065 view.dispatchDetachedFromWindow(); 3066 } 3067 super.dispatchDetachedFromWindow(); 3068 } 3069 3070 /** 3071 * @hide 3072 */ 3073 @Override 3074 protected void internalSetPadding(int left, int top, int right, int bottom) { 3075 super.internalSetPadding(left, top, right, bottom); 3076 3077 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 3078 mGroupFlags |= FLAG_PADDING_NOT_NULL; 3079 } else { 3080 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 3081 } 3082 } 3083 3084 @Override 3085 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 3086 super.dispatchSaveInstanceState(container); 3087 final int count = mChildrenCount; 3088 final View[] children = mChildren; 3089 for (int i = 0; i < count; i++) { 3090 View c = children[i]; 3091 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3092 c.dispatchSaveInstanceState(container); 3093 } 3094 } 3095 } 3096 3097 /** 3098 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 3099 * to only this view, not to its children. For use when overriding 3100 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 3101 * subclasses to freeze their own state but not the state of their children. 3102 * 3103 * @param container the container 3104 */ 3105 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 3106 super.dispatchSaveInstanceState(container); 3107 } 3108 3109 @Override 3110 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 3111 super.dispatchRestoreInstanceState(container); 3112 final int count = mChildrenCount; 3113 final View[] children = mChildren; 3114 for (int i = 0; i < count; i++) { 3115 View c = children[i]; 3116 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3117 c.dispatchRestoreInstanceState(container); 3118 } 3119 } 3120 } 3121 3122 /** 3123 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 3124 * to only this view, not to its children. For use when overriding 3125 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 3126 * subclasses to thaw their own state but not the state of their children. 3127 * 3128 * @param container the container 3129 */ 3130 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 3131 super.dispatchRestoreInstanceState(container); 3132 } 3133 3134 /** 3135 * Enables or disables the drawing cache for each child of this view group. 3136 * 3137 * @param enabled true to enable the cache, false to dispose of it 3138 */ 3139 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 3140 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 3141 final View[] children = mChildren; 3142 final int count = mChildrenCount; 3143 for (int i = 0; i < count; i++) { 3144 children[i].setDrawingCacheEnabled(enabled); 3145 } 3146 } 3147 } 3148 3149 @Override 3150 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 3151 int count = mChildrenCount; 3152 int[] visibilities = null; 3153 3154 if (skipChildren) { 3155 visibilities = new int[count]; 3156 for (int i = 0; i < count; i++) { 3157 View child = getChildAt(i); 3158 visibilities[i] = child.getVisibility(); 3159 if (visibilities[i] == View.VISIBLE) { 3160 child.setVisibility(INVISIBLE); 3161 } 3162 } 3163 } 3164 3165 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 3166 3167 if (skipChildren) { 3168 for (int i = 0; i < count; i++) { 3169 getChildAt(i).setVisibility(visibilities[i]); 3170 } 3171 } 3172 3173 return b; 3174 } 3175 3176 /** Return true if this ViewGroup is laying out using optical bounds. */ 3177 boolean isLayoutModeOptical() { 3178 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 3179 } 3180 3181 @Override 3182 Insets computeOpticalInsets() { 3183 if (isLayoutModeOptical()) { 3184 int left = 0; 3185 int top = 0; 3186 int right = 0; 3187 int bottom = 0; 3188 for (int i = 0; i < mChildrenCount; i++) { 3189 View child = getChildAt(i); 3190 if (child.getVisibility() == VISIBLE) { 3191 Insets insets = child.getOpticalInsets(); 3192 left = Math.max(left, insets.left); 3193 top = Math.max(top, insets.top); 3194 right = Math.max(right, insets.right); 3195 bottom = Math.max(bottom, insets.bottom); 3196 } 3197 } 3198 return Insets.of(left, top, right, bottom); 3199 } else { 3200 return Insets.NONE; 3201 } 3202 } 3203 3204 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 3205 if (x1 != x2 && y1 != y2) { 3206 if (x1 > x2) { 3207 int tmp = x1; x1 = x2; x2 = tmp; 3208 } 3209 if (y1 > y2) { 3210 int tmp = y1; y1 = y2; y2 = tmp; 3211 } 3212 canvas.drawRect(x1, y1, x2, y2, paint); 3213 } 3214 } 3215 3216 private static int sign(int x) { 3217 return (x >= 0) ? 1 : -1; 3218 } 3219 3220 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 3221 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 3222 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 3223 } 3224 3225 private int dipsToPixels(int dips) { 3226 float scale = getContext().getResources().getDisplayMetrics().density; 3227 return (int) (dips * scale + 0.5f); 3228 } 3229 3230 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 3231 int lineLength, int lineWidth) { 3232 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 3233 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 3234 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 3235 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 3236 } 3237 3238 private static void fillDifference(Canvas canvas, 3239 int x2, int y2, int x3, int y3, 3240 int dx1, int dy1, int dx2, int dy2, Paint paint) { 3241 int x1 = x2 - dx1; 3242 int y1 = y2 - dy1; 3243 3244 int x4 = x3 + dx2; 3245 int y4 = y3 + dy2; 3246 3247 fillRect(canvas, paint, x1, y1, x4, y2); 3248 fillRect(canvas, paint, x1, y2, x2, y3); 3249 fillRect(canvas, paint, x3, y2, x4, y3); 3250 fillRect(canvas, paint, x1, y3, x4, y4); 3251 } 3252 3253 /** 3254 * @hide 3255 */ 3256 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 3257 for (int i = 0; i < getChildCount(); i++) { 3258 View c = getChildAt(i); 3259 c.getLayoutParams().onDebugDraw(c, canvas, paint); 3260 } 3261 } 3262 3263 /** 3264 * @hide 3265 */ 3266 protected void onDebugDraw(Canvas canvas) { 3267 Paint paint = getDebugPaint(); 3268 3269 // Draw optical bounds 3270 { 3271 paint.setColor(Color.RED); 3272 paint.setStyle(Paint.Style.STROKE); 3273 3274 for (int i = 0; i < getChildCount(); i++) { 3275 View c = getChildAt(i); 3276 if (c.getVisibility() != View.GONE) { 3277 Insets insets = c.getOpticalInsets(); 3278 3279 drawRect(canvas, paint, 3280 c.getLeft() + insets.left, 3281 c.getTop() + insets.top, 3282 c.getRight() - insets.right - 1, 3283 c.getBottom() - insets.bottom - 1); 3284 } 3285 } 3286 } 3287 3288 // Draw margins 3289 { 3290 paint.setColor(Color.argb(63, 255, 0, 255)); 3291 paint.setStyle(Paint.Style.FILL); 3292 3293 onDebugDrawMargins(canvas, paint); 3294 } 3295 3296 // Draw clip bounds 3297 { 3298 paint.setColor(Color.rgb(63, 127, 255)); 3299 paint.setStyle(Paint.Style.FILL); 3300 3301 int lineLength = dipsToPixels(8); 3302 int lineWidth = dipsToPixels(1); 3303 for (int i = 0; i < getChildCount(); i++) { 3304 View c = getChildAt(i); 3305 if (c.getVisibility() != View.GONE) { 3306 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 3307 paint, lineLength, lineWidth); 3308 } 3309 } 3310 } 3311 } 3312 3313 @Override 3314 protected void dispatchDraw(Canvas canvas) { 3315 boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode); 3316 final int childrenCount = mChildrenCount; 3317 final View[] children = mChildren; 3318 int flags = mGroupFlags; 3319 3320 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 3321 final boolean buildCache = !isHardwareAccelerated(); 3322 for (int i = 0; i < childrenCount; i++) { 3323 final View child = children[i]; 3324 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3325 final LayoutParams params = child.getLayoutParams(); 3326 attachLayoutAnimationParameters(child, params, i, childrenCount); 3327 bindLayoutAnimation(child); 3328 } 3329 } 3330 3331 final LayoutAnimationController controller = mLayoutAnimationController; 3332 if (controller.willOverlap()) { 3333 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 3334 } 3335 3336 controller.start(); 3337 3338 mGroupFlags &= ~FLAG_RUN_ANIMATION; 3339 mGroupFlags &= ~FLAG_ANIMATION_DONE; 3340 3341 if (mAnimationListener != null) { 3342 mAnimationListener.onAnimationStart(controller.getAnimation()); 3343 } 3344 } 3345 3346 int clipSaveCount = 0; 3347 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3348 if (clipToPadding) { 3349 clipSaveCount = canvas.save(); 3350 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 3351 mScrollX + mRight - mLeft - mPaddingRight, 3352 mScrollY + mBottom - mTop - mPaddingBottom); 3353 } 3354 3355 // We will draw our child's animation, let's reset the flag 3356 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 3357 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 3358 3359 boolean more = false; 3360 final long drawingTime = getDrawingTime(); 3361 3362 if (usingRenderNodeProperties) canvas.insertReorderBarrier(); 3363 final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 3364 int transientIndex = transientCount != 0 ? 0 : -1; 3365 // Only use the preordered list if not HW accelerated, since the HW pipeline will do the 3366 // draw reordering internally 3367 final ArrayList<View> preorderedList = usingRenderNodeProperties 3368 ? null : buildOrderedChildList(); 3369 final boolean customOrder = preorderedList == null 3370 && isChildrenDrawingOrderEnabled(); 3371 for (int i = 0; i < childrenCount; i++) { 3372 while (transientIndex >= 0 && mTransientIndices.get(transientIndex) == i) { 3373 final View transientChild = mTransientViews.get(transientIndex); 3374 if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE || 3375 transientChild.getAnimation() != null) { 3376 more |= drawChild(canvas, transientChild, drawingTime); 3377 } 3378 transientIndex++; 3379 if (transientIndex >= transientCount) { 3380 transientIndex = -1; 3381 } 3382 } 3383 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 3384 final View child = (preorderedList == null) 3385 ? children[childIndex] : preorderedList.get(childIndex); 3386 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 3387 more |= drawChild(canvas, child, drawingTime); 3388 } 3389 } 3390 while (transientIndex >= 0) { 3391 // there may be additional transient views after the normal views 3392 final View transientChild = mTransientViews.get(transientIndex); 3393 if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE || 3394 transientChild.getAnimation() != null) { 3395 more |= drawChild(canvas, transientChild, drawingTime); 3396 } 3397 transientIndex++; 3398 if (transientIndex >= transientCount) { 3399 break; 3400 } 3401 } 3402 if (preorderedList != null) preorderedList.clear(); 3403 3404 // Draw any disappearing views that have animations 3405 if (mDisappearingChildren != null) { 3406 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3407 final int disappearingCount = disappearingChildren.size() - 1; 3408 // Go backwards -- we may delete as animations finish 3409 for (int i = disappearingCount; i >= 0; i--) { 3410 final View child = disappearingChildren.get(i); 3411 more |= drawChild(canvas, child, drawingTime); 3412 } 3413 } 3414 if (usingRenderNodeProperties) canvas.insertInorderBarrier(); 3415 3416 if (debugDraw()) { 3417 onDebugDraw(canvas); 3418 } 3419 3420 if (clipToPadding) { 3421 canvas.restoreToCount(clipSaveCount); 3422 } 3423 3424 // mGroupFlags might have been updated by drawChild() 3425 flags = mGroupFlags; 3426 3427 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3428 invalidate(true); 3429 } 3430 3431 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3432 mLayoutAnimationController.isDone() && !more) { 3433 // We want to erase the drawing cache and notify the listener after the 3434 // next frame is drawn because one extra invalidate() is caused by 3435 // drawChild() after the animation is over 3436 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3437 final Runnable end = new Runnable() { 3438 @Override 3439 public void run() { 3440 notifyAnimationListener(); 3441 } 3442 }; 3443 post(end); 3444 } 3445 } 3446 3447 /** 3448 * Returns the ViewGroupOverlay for this view group, creating it if it does 3449 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3450 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3451 * views, like overlay drawables, are visual-only; they do not receive input 3452 * events and should not be used as anything other than a temporary 3453 * representation of a view in a parent container, such as might be used 3454 * by an animation effect. 3455 * 3456 * <p>Note: Overlays do not currently work correctly with {@link 3457 * SurfaceView} or {@link TextureView}; contents in overlays for these 3458 * types of views may not display correctly.</p> 3459 * 3460 * @return The ViewGroupOverlay object for this view. 3461 * @see ViewGroupOverlay 3462 */ 3463 @Override 3464 public ViewGroupOverlay getOverlay() { 3465 if (mOverlay == null) { 3466 mOverlay = new ViewGroupOverlay(mContext, this); 3467 } 3468 return (ViewGroupOverlay) mOverlay; 3469 } 3470 3471 /** 3472 * Returns the index of the child to draw for this iteration. Override this 3473 * if you want to change the drawing order of children. By default, it 3474 * returns i. 3475 * <p> 3476 * NOTE: In order for this method to be called, you must enable child ordering 3477 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3478 * 3479 * @param i The current iteration. 3480 * @return The index of the child to draw this iteration. 3481 * 3482 * @see #setChildrenDrawingOrderEnabled(boolean) 3483 * @see #isChildrenDrawingOrderEnabled() 3484 */ 3485 protected int getChildDrawingOrder(int childCount, int i) { 3486 return i; 3487 } 3488 3489 private boolean hasChildWithZ() { 3490 for (int i = 0; i < mChildrenCount; i++) { 3491 if (mChildren[i].getZ() != 0) return true; 3492 } 3493 return false; 3494 } 3495 3496 /** 3497 * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children, 3498 * sorted first by Z, then by child drawing order (if applicable). This list must be cleared 3499 * after use to avoid leaking child Views. 3500 * 3501 * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated 3502 * children. 3503 */ 3504 ArrayList<View> buildOrderedChildList() { 3505 final int count = mChildrenCount; 3506 if (count <= 1 || !hasChildWithZ()) return null; 3507 3508 if (mPreSortedChildren == null) { 3509 mPreSortedChildren = new ArrayList<View>(count); 3510 } else { 3511 mPreSortedChildren.ensureCapacity(count); 3512 } 3513 3514 final boolean useCustomOrder = isChildrenDrawingOrderEnabled(); 3515 for (int i = 0; i < mChildrenCount; i++) { 3516 // add next child (in child order) to end of list 3517 int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i; 3518 View nextChild = mChildren[childIndex]; 3519 float currentZ = nextChild.getZ(); 3520 3521 // insert ahead of any Views with greater Z 3522 int insertIndex = i; 3523 while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) { 3524 insertIndex--; 3525 } 3526 mPreSortedChildren.add(insertIndex, nextChild); 3527 } 3528 return mPreSortedChildren; 3529 } 3530 3531 private void notifyAnimationListener() { 3532 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3533 mGroupFlags |= FLAG_ANIMATION_DONE; 3534 3535 if (mAnimationListener != null) { 3536 final Runnable end = new Runnable() { 3537 @Override 3538 public void run() { 3539 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3540 } 3541 }; 3542 post(end); 3543 } 3544 3545 invalidate(true); 3546 } 3547 3548 /** 3549 * This method is used to cause children of this ViewGroup to restore or recreate their 3550 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3551 * to recreate its own display list, which would happen if it went through the normal 3552 * draw/dispatchDraw mechanisms. 3553 * 3554 * @hide 3555 */ 3556 @Override 3557 protected void dispatchGetDisplayList() { 3558 final int count = mChildrenCount; 3559 final View[] children = mChildren; 3560 for (int i = 0; i < count; i++) { 3561 final View child = children[i]; 3562 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null)) { 3563 recreateChildDisplayList(child); 3564 } 3565 } 3566 if (mOverlay != null) { 3567 View overlayView = mOverlay.getOverlayView(); 3568 recreateChildDisplayList(overlayView); 3569 } 3570 if (mDisappearingChildren != null) { 3571 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3572 final int disappearingCount = disappearingChildren.size(); 3573 for (int i = 0; i < disappearingCount; ++i) { 3574 final View child = disappearingChildren.get(i); 3575 recreateChildDisplayList(child); 3576 } 3577 } 3578 } 3579 3580 private void recreateChildDisplayList(View child) { 3581 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) != 0; 3582 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3583 child.updateDisplayListIfDirty(); 3584 child.mRecreateDisplayList = false; 3585 } 3586 3587 /** 3588 * Draw one child of this View Group. This method is responsible for getting 3589 * the canvas in the right state. This includes clipping, translating so 3590 * that the child's scrolled origin is at 0, 0, and applying any animation 3591 * transformations. 3592 * 3593 * @param canvas The canvas on which to draw the child 3594 * @param child Who to draw 3595 * @param drawingTime The time at which draw is occurring 3596 * @return True if an invalidate() was issued 3597 */ 3598 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3599 return child.draw(canvas, this, drawingTime); 3600 } 3601 3602 @Override 3603 void getScrollIndicatorBounds(@NonNull Rect out) { 3604 super.getScrollIndicatorBounds(out); 3605 3606 // If we have padding and we're supposed to clip children to that 3607 // padding, offset the scroll indicators to match our clip bounds. 3608 final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3609 if (clipToPadding) { 3610 out.left += mPaddingLeft; 3611 out.right -= mPaddingRight; 3612 out.top += mPaddingTop; 3613 out.bottom -= mPaddingBottom; 3614 } 3615 } 3616 3617 /** 3618 * Returns whether this group's children are clipped to their bounds before drawing. 3619 * The default value is true. 3620 * @see #setClipChildren(boolean) 3621 * 3622 * @return True if the group's children will be clipped to their bounds, 3623 * false otherwise. 3624 */ 3625 @ViewDebug.ExportedProperty(category = "drawing") 3626 public boolean getClipChildren() { 3627 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3628 } 3629 3630 /** 3631 * By default, children are clipped to their bounds before drawing. This 3632 * allows view groups to override this behavior for animations, etc. 3633 * 3634 * @param clipChildren true to clip children to their bounds, 3635 * false otherwise 3636 * @attr ref android.R.styleable#ViewGroup_clipChildren 3637 */ 3638 public void setClipChildren(boolean clipChildren) { 3639 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3640 if (clipChildren != previousValue) { 3641 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3642 for (int i = 0; i < mChildrenCount; ++i) { 3643 View child = getChildAt(i); 3644 if (child.mRenderNode != null) { 3645 child.mRenderNode.setClipToBounds(clipChildren); 3646 } 3647 } 3648 invalidate(true); 3649 } 3650 } 3651 3652 /** 3653 * Sets whether this ViewGroup will clip its children to its padding and resize (but not 3654 * clip) any EdgeEffect to the padded region, if padding is present. 3655 * <p> 3656 * By default, children are clipped to the padding of their parent 3657 * ViewGroup. This clipping behavior is only enabled if padding is non-zero. 3658 * 3659 * @param clipToPadding true to clip children to the padding of the group, and resize (but 3660 * not clip) any EdgeEffect to the padded region. False otherwise. 3661 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3662 */ 3663 public void setClipToPadding(boolean clipToPadding) { 3664 if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) { 3665 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3666 invalidate(true); 3667 } 3668 } 3669 3670 /** 3671 * Returns whether this ViewGroup will clip its children to its padding, and resize (but 3672 * not clip) any EdgeEffect to the padded region, if padding is present. 3673 * <p> 3674 * By default, children are clipped to the padding of their parent 3675 * Viewgroup. This clipping behavior is only enabled if padding is non-zero. 3676 * 3677 * @return true if this ViewGroup clips children to its padding and resizes (but doesn't 3678 * clip) any EdgeEffect to the padded region, false otherwise. 3679 * 3680 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3681 */ 3682 @ViewDebug.ExportedProperty(category = "drawing") 3683 public boolean getClipToPadding() { 3684 return hasBooleanFlag(FLAG_CLIP_TO_PADDING); 3685 } 3686 3687 @Override 3688 public void dispatchSetSelected(boolean selected) { 3689 final View[] children = mChildren; 3690 final int count = mChildrenCount; 3691 for (int i = 0; i < count; i++) { 3692 children[i].setSelected(selected); 3693 } 3694 } 3695 3696 @Override 3697 public void dispatchSetActivated(boolean activated) { 3698 final View[] children = mChildren; 3699 final int count = mChildrenCount; 3700 for (int i = 0; i < count; i++) { 3701 children[i].setActivated(activated); 3702 } 3703 } 3704 3705 @Override 3706 protected void dispatchSetPressed(boolean pressed) { 3707 final View[] children = mChildren; 3708 final int count = mChildrenCount; 3709 for (int i = 0; i < count; i++) { 3710 final View child = children[i]; 3711 // Children that are clickable on their own should not 3712 // show a pressed state when their parent view does. 3713 // Clearing a pressed state always propagates. 3714 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3715 child.setPressed(pressed); 3716 } 3717 } 3718 } 3719 3720 /** 3721 * Dispatches drawable hotspot changes to child views that meet at least 3722 * one of the following criteria: 3723 * <ul> 3724 * <li>Returns {@code false} from both {@link View#isClickable()} and 3725 * {@link View#isLongClickable()}</li> 3726 * <li>Requests duplication of parent state via 3727 * {@link View#setDuplicateParentStateEnabled(boolean)}</li> 3728 * </ul> 3729 * 3730 * @param x hotspot x coordinate 3731 * @param y hotspot y coordinate 3732 * @see #drawableHotspotChanged(float, float) 3733 */ 3734 @Override 3735 public void dispatchDrawableHotspotChanged(float x, float y) { 3736 final int count = mChildrenCount; 3737 if (count == 0) { 3738 return; 3739 } 3740 3741 final View[] children = mChildren; 3742 for (int i = 0; i < count; i++) { 3743 final View child = children[i]; 3744 // Children that are clickable on their own should not 3745 // receive hotspots when their parent view does. 3746 final boolean nonActionable = !child.isClickable() && !child.isLongClickable(); 3747 final boolean duplicatesState = (child.mViewFlags & DUPLICATE_PARENT_STATE) != 0; 3748 if (nonActionable || duplicatesState) { 3749 final float[] point = getTempPoint(); 3750 point[0] = x; 3751 point[1] = y; 3752 transformPointToViewLocal(point, child); 3753 child.drawableHotspotChanged(point[0], point[1]); 3754 } 3755 } 3756 } 3757 3758 @Override 3759 void dispatchCancelPendingInputEvents() { 3760 super.dispatchCancelPendingInputEvents(); 3761 3762 final View[] children = mChildren; 3763 final int count = mChildrenCount; 3764 for (int i = 0; i < count; i++) { 3765 children[i].dispatchCancelPendingInputEvents(); 3766 } 3767 } 3768 3769 /** 3770 * When this property is set to true, this ViewGroup supports static transformations on 3771 * children; this causes 3772 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3773 * invoked when a child is drawn. 3774 * 3775 * Any subclass overriding 3776 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3777 * set this property to true. 3778 * 3779 * @param enabled True to enable static transformations on children, false otherwise. 3780 * 3781 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3782 */ 3783 protected void setStaticTransformationsEnabled(boolean enabled) { 3784 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3785 } 3786 3787 /** 3788 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3789 * boolean to indicate whether a static transform was set. The default implementation 3790 * simply returns <code>false</code>; subclasses may override this method for different 3791 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3792 * for this method to be called. 3793 * 3794 * @param child The child view whose static transform is being requested 3795 * @param t The Transformation which will hold the result 3796 * @return true if the transformation was set, false otherwise 3797 * @see #setStaticTransformationsEnabled(boolean) 3798 */ 3799 protected boolean getChildStaticTransformation(View child, Transformation t) { 3800 return false; 3801 } 3802 3803 Transformation getChildTransformation() { 3804 if (mChildTransformation == null) { 3805 mChildTransformation = new Transformation(); 3806 } 3807 return mChildTransformation; 3808 } 3809 3810 /** 3811 * {@hide} 3812 */ 3813 @Override 3814 protected View findViewTraversal(@IdRes int id) { 3815 if (id == mID) { 3816 return this; 3817 } 3818 3819 final View[] where = mChildren; 3820 final int len = mChildrenCount; 3821 3822 for (int i = 0; i < len; i++) { 3823 View v = where[i]; 3824 3825 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3826 v = v.findViewById(id); 3827 3828 if (v != null) { 3829 return v; 3830 } 3831 } 3832 } 3833 3834 return null; 3835 } 3836 3837 /** 3838 * {@hide} 3839 */ 3840 @Override 3841 protected View findViewWithTagTraversal(Object tag) { 3842 if (tag != null && tag.equals(mTag)) { 3843 return this; 3844 } 3845 3846 final View[] where = mChildren; 3847 final int len = mChildrenCount; 3848 3849 for (int i = 0; i < len; i++) { 3850 View v = where[i]; 3851 3852 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3853 v = v.findViewWithTag(tag); 3854 3855 if (v != null) { 3856 return v; 3857 } 3858 } 3859 } 3860 3861 return null; 3862 } 3863 3864 /** 3865 * {@hide} 3866 */ 3867 @Override 3868 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3869 if (predicate.apply(this)) { 3870 return this; 3871 } 3872 3873 final View[] where = mChildren; 3874 final int len = mChildrenCount; 3875 3876 for (int i = 0; i < len; i++) { 3877 View v = where[i]; 3878 3879 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3880 v = v.findViewByPredicate(predicate); 3881 3882 if (v != null) { 3883 return v; 3884 } 3885 } 3886 } 3887 3888 return null; 3889 } 3890 3891 /** 3892 * This method adds a view to this container at the specified index purely for the 3893 * purposes of allowing that view to draw even though it is not a normal child of 3894 * the container. That is, the view does not participate in layout, focus, accessibility, 3895 * input, or other normal view operations; it is purely an item to be drawn during the normal 3896 * rendering operation of this container. The index that it is added at is the order 3897 * in which it will be drawn, with respect to the other views in the container. 3898 * For example, a transient view added at index 0 will be drawn before all other views 3899 * in the container because it will be drawn first (including before any real view 3900 * at index 0). There can be more than one transient view at any particular index; 3901 * these views will be drawn in the order in which they were added to the list of 3902 * transient views. The index of transient views can also be greater than the number 3903 * of normal views in the container; that just means that they will be drawn after all 3904 * other views are drawn. 3905 * 3906 * <p>Note that since transient views do not participate in layout, they must be sized 3907 * manually or, more typically, they should just use the size that they had before they 3908 * were removed from their container.</p> 3909 * 3910 * <p>Transient views are useful for handling animations of views that have been removed 3911 * from the container, but which should be animated out after the removal. Adding these 3912 * views as transient views allows them to participate in drawing without side-effecting 3913 * the layout of the container.</p> 3914 * 3915 * <p>Transient views must always be explicitly {@link #removeTransientView(View) removed} 3916 * from the container when they are no longer needed. For example, a transient view 3917 * which is added in order to fade it out in its old location should be removed 3918 * once the animation is complete.</p> 3919 * 3920 * @param view The view to be added 3921 * @param index The index at which this view should be drawn, must be >= 0. 3922 * This value is relative to the {@link #getChildAt(int) index} values in the normal 3923 * child list of this container, where any transient view at a particular index will 3924 * be drawn before any normal child at that same index. 3925 * 3926 * @hide 3927 */ 3928 public void addTransientView(View view, int index) { 3929 if (index < 0) { 3930 return; 3931 } 3932 if (mTransientIndices == null) { 3933 mTransientIndices = new ArrayList<Integer>(); 3934 mTransientViews = new ArrayList<View>(); 3935 } 3936 final int oldSize = mTransientIndices.size(); 3937 if (oldSize > 0) { 3938 int insertionIndex; 3939 for (insertionIndex = 0; insertionIndex < oldSize; ++insertionIndex) { 3940 if (index < mTransientIndices.get(insertionIndex)) { 3941 break; 3942 } 3943 } 3944 mTransientIndices.add(insertionIndex, index); 3945 mTransientViews.add(insertionIndex, view); 3946 } else { 3947 mTransientIndices.add(index); 3948 mTransientViews.add(view); 3949 } 3950 view.mParent = this; 3951 view.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3952 invalidate(true); 3953 } 3954 3955 /** 3956 * Removes a view from the list of transient views in this container. If there is no 3957 * such transient view, this method does nothing. 3958 * 3959 * @param view The transient view to be removed 3960 * 3961 * @hide 3962 */ 3963 public void removeTransientView(View view) { 3964 if (mTransientViews == null) { 3965 return; 3966 } 3967 final int size = mTransientViews.size(); 3968 for (int i = 0; i < size; ++i) { 3969 if (view == mTransientViews.get(i)) { 3970 mTransientViews.remove(i); 3971 mTransientIndices.remove(i); 3972 view.mParent = null; 3973 view.dispatchDetachedFromWindow(); 3974 invalidate(true); 3975 return; 3976 } 3977 } 3978 } 3979 3980 /** 3981 * Returns the number of transient views in this container. Specific transient 3982 * views and the index at which they were added can be retrieved via 3983 * {@link #getTransientView(int)} and {@link #getTransientViewIndex(int)}. 3984 * 3985 * @see #addTransientView(View, int) 3986 * @return The number of transient views in this container 3987 * 3988 * @hide 3989 */ 3990 public int getTransientViewCount() { 3991 return mTransientIndices == null ? 0 : mTransientIndices.size(); 3992 } 3993 3994 /** 3995 * Given a valid position within the list of transient views, returns the index of 3996 * the transient view at that position. 3997 * 3998 * @param position The position of the index being queried. Must be at least 0 3999 * and less than the value returned by {@link #getTransientViewCount()}. 4000 * @return The index of the transient view stored in the given position if the 4001 * position is valid, otherwise -1 4002 * 4003 * @hide 4004 */ 4005 public int getTransientViewIndex(int position) { 4006 if (position < 0 || mTransientIndices == null || position >= mTransientIndices.size()) { 4007 return -1; 4008 } 4009 return mTransientIndices.get(position); 4010 } 4011 4012 /** 4013 * Given a valid position within the list of transient views, returns the 4014 * transient view at that position. 4015 * 4016 * @param position The position of the view being queried. Must be at least 0 4017 * and less than the value returned by {@link #getTransientViewCount()}. 4018 * @return The transient view stored in the given position if the 4019 * position is valid, otherwise null 4020 * 4021 * @hide 4022 */ 4023 public View getTransientView(int position) { 4024 if (mTransientViews == null || position >= mTransientViews.size()) { 4025 return null; 4026 } 4027 return mTransientViews.get(position); 4028 } 4029 4030 /** 4031 * <p>Adds a child view. If no layout parameters are already set on the child, the 4032 * default parameters for this ViewGroup are set on the child.</p> 4033 * 4034 * <p><strong>Note:</strong> do not invoke this method from 4035 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4036 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4037 * 4038 * @param child the child view to add 4039 * 4040 * @see #generateDefaultLayoutParams() 4041 */ 4042 public void addView(View child) { 4043 addView(child, -1); 4044 } 4045 4046 /** 4047 * Adds a child view. If no layout parameters are already set on the child, the 4048 * default parameters for this ViewGroup are set on the child. 4049 * 4050 * <p><strong>Note:</strong> do not invoke this method from 4051 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4052 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4053 * 4054 * @param child the child view to add 4055 * @param index the position at which to add the child 4056 * 4057 * @see #generateDefaultLayoutParams() 4058 */ 4059 public void addView(View child, int index) { 4060 if (child == null) { 4061 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4062 } 4063 LayoutParams params = child.getLayoutParams(); 4064 if (params == null) { 4065 params = generateDefaultLayoutParams(); 4066 if (params == null) { 4067 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 4068 } 4069 } 4070 addView(child, index, params); 4071 } 4072 4073 /** 4074 * Adds a child view with this ViewGroup's default layout parameters and the 4075 * specified width and height. 4076 * 4077 * <p><strong>Note:</strong> do not invoke this method from 4078 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4079 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4080 * 4081 * @param child the child view to add 4082 */ 4083 public void addView(View child, int width, int height) { 4084 final LayoutParams params = generateDefaultLayoutParams(); 4085 params.width = width; 4086 params.height = height; 4087 addView(child, -1, params); 4088 } 4089 4090 /** 4091 * Adds a child view with the specified layout parameters. 4092 * 4093 * <p><strong>Note:</strong> do not invoke this method from 4094 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4095 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4096 * 4097 * @param child the child view to add 4098 * @param params the layout parameters to set on the child 4099 */ 4100 @Override 4101 public void addView(View child, LayoutParams params) { 4102 addView(child, -1, params); 4103 } 4104 4105 /** 4106 * Adds a child view with the specified layout parameters. 4107 * 4108 * <p><strong>Note:</strong> do not invoke this method from 4109 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4110 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4111 * 4112 * @param child the child view to add 4113 * @param index the position at which to add the child or -1 to add last 4114 * @param params the layout parameters to set on the child 4115 */ 4116 public void addView(View child, int index, LayoutParams params) { 4117 if (DBG) { 4118 System.out.println(this + " addView"); 4119 } 4120 4121 if (child == null) { 4122 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4123 } 4124 4125 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 4126 // therefore, we call requestLayout() on ourselves before, so that the child's request 4127 // will be blocked at our level 4128 requestLayout(); 4129 invalidate(true); 4130 addViewInner(child, index, params, false); 4131 } 4132 4133 @Override 4134 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 4135 if (!checkLayoutParams(params)) { 4136 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 4137 } 4138 if (view.mParent != this) { 4139 throw new IllegalArgumentException("Given view not a child of " + this); 4140 } 4141 view.setLayoutParams(params); 4142 } 4143 4144 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 4145 return p != null; 4146 } 4147 4148 /** 4149 * Interface definition for a callback to be invoked when the hierarchy 4150 * within this view changed. The hierarchy changes whenever a child is added 4151 * to or removed from this view. 4152 */ 4153 public interface OnHierarchyChangeListener { 4154 /** 4155 * Called when a new child is added to a parent view. 4156 * 4157 * @param parent the view in which a child was added 4158 * @param child the new child view added in the hierarchy 4159 */ 4160 void onChildViewAdded(View parent, View child); 4161 4162 /** 4163 * Called when a child is removed from a parent view. 4164 * 4165 * @param parent the view from which the child was removed 4166 * @param child the child removed from the hierarchy 4167 */ 4168 void onChildViewRemoved(View parent, View child); 4169 } 4170 4171 /** 4172 * Register a callback to be invoked when a child is added to or removed 4173 * from this view. 4174 * 4175 * @param listener the callback to invoke on hierarchy change 4176 */ 4177 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 4178 mOnHierarchyChangeListener = listener; 4179 } 4180 4181 void dispatchViewAdded(View child) { 4182 onViewAdded(child); 4183 if (mOnHierarchyChangeListener != null) { 4184 mOnHierarchyChangeListener.onChildViewAdded(this, child); 4185 } 4186 } 4187 4188 /** 4189 * Called when a new child is added to this ViewGroup. Overrides should always 4190 * call super.onViewAdded. 4191 * 4192 * @param child the added child view 4193 */ 4194 public void onViewAdded(View child) { 4195 } 4196 4197 void dispatchViewRemoved(View child) { 4198 onViewRemoved(child); 4199 if (mOnHierarchyChangeListener != null) { 4200 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 4201 } 4202 } 4203 4204 /** 4205 * Called when a child view is removed from this ViewGroup. Overrides should always 4206 * call super.onViewRemoved. 4207 * 4208 * @param child the removed child view 4209 */ 4210 public void onViewRemoved(View child) { 4211 } 4212 4213 private void clearCachedLayoutMode() { 4214 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4215 mLayoutMode = LAYOUT_MODE_UNDEFINED; 4216 } 4217 } 4218 4219 @Override 4220 protected void onAttachedToWindow() { 4221 super.onAttachedToWindow(); 4222 clearCachedLayoutMode(); 4223 } 4224 4225 @Override 4226 protected void onDetachedFromWindow() { 4227 super.onDetachedFromWindow(); 4228 clearCachedLayoutMode(); 4229 } 4230 4231 /** 4232 * Adds a view during layout. This is useful if in your onLayout() method, 4233 * you need to add more views (as does the list view for example). 4234 * 4235 * If index is negative, it means put it at the end of the list. 4236 * 4237 * @param child the view to add to the group 4238 * @param index the index at which the child must be added or -1 to add last 4239 * @param params the layout parameters to associate with the child 4240 * @return true if the child was added, false otherwise 4241 */ 4242 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 4243 return addViewInLayout(child, index, params, false); 4244 } 4245 4246 /** 4247 * Adds a view during layout. This is useful if in your onLayout() method, 4248 * you need to add more views (as does the list view for example). 4249 * 4250 * If index is negative, it means put it at the end of the list. 4251 * 4252 * @param child the view to add to the group 4253 * @param index the index at which the child must be added or -1 to add last 4254 * @param params the layout parameters to associate with the child 4255 * @param preventRequestLayout if true, calling this method will not trigger a 4256 * layout request on child 4257 * @return true if the child was added, false otherwise 4258 */ 4259 protected boolean addViewInLayout(View child, int index, LayoutParams params, 4260 boolean preventRequestLayout) { 4261 if (child == null) { 4262 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4263 } 4264 child.mParent = null; 4265 addViewInner(child, index, params, preventRequestLayout); 4266 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 4267 return true; 4268 } 4269 4270 /** 4271 * Prevents the specified child to be laid out during the next layout pass. 4272 * 4273 * @param child the child on which to perform the cleanup 4274 */ 4275 protected void cleanupLayoutState(View child) { 4276 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 4277 } 4278 4279 private void addViewInner(View child, int index, LayoutParams params, 4280 boolean preventRequestLayout) { 4281 4282 if (mTransition != null) { 4283 // Don't prevent other add transitions from completing, but cancel remove 4284 // transitions to let them complete the process before we add to the container 4285 mTransition.cancel(LayoutTransition.DISAPPEARING); 4286 } 4287 4288 if (child.getParent() != null) { 4289 throw new IllegalStateException("The specified child already has a parent. " + 4290 "You must call removeView() on the child's parent first."); 4291 } 4292 4293 if (mTransition != null) { 4294 mTransition.addChild(this, child); 4295 } 4296 4297 if (!checkLayoutParams(params)) { 4298 params = generateLayoutParams(params); 4299 } 4300 4301 if (preventRequestLayout) { 4302 child.mLayoutParams = params; 4303 } else { 4304 child.setLayoutParams(params); 4305 } 4306 4307 if (index < 0) { 4308 index = mChildrenCount; 4309 } 4310 4311 addInArray(child, index); 4312 4313 // tell our children 4314 if (preventRequestLayout) { 4315 child.assignParent(this); 4316 } else { 4317 child.mParent = this; 4318 } 4319 4320 if (child.hasFocus()) { 4321 requestChildFocus(child, child.findFocus()); 4322 } 4323 4324 AttachInfo ai = mAttachInfo; 4325 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 4326 boolean lastKeepOn = ai.mKeepScreenOn; 4327 ai.mKeepScreenOn = false; 4328 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 4329 if (ai.mKeepScreenOn) { 4330 needGlobalAttributesUpdate(true); 4331 } 4332 ai.mKeepScreenOn = lastKeepOn; 4333 } 4334 4335 if (child.isLayoutDirectionInherited()) { 4336 child.resetRtlProperties(); 4337 } 4338 4339 dispatchViewAdded(child); 4340 4341 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 4342 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 4343 } 4344 4345 if (child.hasTransientState()) { 4346 childHasTransientStateChanged(child, true); 4347 } 4348 4349 if (child.getVisibility() != View.GONE) { 4350 notifySubtreeAccessibilityStateChangedIfNeeded(); 4351 } 4352 4353 if (mTransientIndices != null) { 4354 final int transientCount = mTransientIndices.size(); 4355 for (int i = 0; i < transientCount; ++i) { 4356 final int oldIndex = mTransientIndices.get(i); 4357 if (index <= oldIndex) { 4358 mTransientIndices.set(i, oldIndex + 1); 4359 } 4360 } 4361 } 4362 4363 if (mCurrentDragStartEvent != null && child.getVisibility() == VISIBLE) { 4364 notifyChildOfDragStart(child); 4365 } 4366 } 4367 4368 private void addInArray(View child, int index) { 4369 View[] children = mChildren; 4370 final int count = mChildrenCount; 4371 final int size = children.length; 4372 if (index == count) { 4373 if (size == count) { 4374 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4375 System.arraycopy(children, 0, mChildren, 0, size); 4376 children = mChildren; 4377 } 4378 children[mChildrenCount++] = child; 4379 } else if (index < count) { 4380 if (size == count) { 4381 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4382 System.arraycopy(children, 0, mChildren, 0, index); 4383 System.arraycopy(children, index, mChildren, index + 1, count - index); 4384 children = mChildren; 4385 } else { 4386 System.arraycopy(children, index, children, index + 1, count - index); 4387 } 4388 children[index] = child; 4389 mChildrenCount++; 4390 if (mLastTouchDownIndex >= index) { 4391 mLastTouchDownIndex++; 4392 } 4393 } else { 4394 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 4395 } 4396 } 4397 4398 // This method also sets the child's mParent to null 4399 private void removeFromArray(int index) { 4400 final View[] children = mChildren; 4401 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 4402 children[index].mParent = null; 4403 } 4404 final int count = mChildrenCount; 4405 if (index == count - 1) { 4406 children[--mChildrenCount] = null; 4407 } else if (index >= 0 && index < count) { 4408 System.arraycopy(children, index + 1, children, index, count - index - 1); 4409 children[--mChildrenCount] = null; 4410 } else { 4411 throw new IndexOutOfBoundsException(); 4412 } 4413 if (mLastTouchDownIndex == index) { 4414 mLastTouchDownTime = 0; 4415 mLastTouchDownIndex = -1; 4416 } else if (mLastTouchDownIndex > index) { 4417 mLastTouchDownIndex--; 4418 } 4419 } 4420 4421 // This method also sets the children's mParent to null 4422 private void removeFromArray(int start, int count) { 4423 final View[] children = mChildren; 4424 final int childrenCount = mChildrenCount; 4425 4426 start = Math.max(0, start); 4427 final int end = Math.min(childrenCount, start + count); 4428 4429 if (start == end) { 4430 return; 4431 } 4432 4433 if (end == childrenCount) { 4434 for (int i = start; i < end; i++) { 4435 children[i].mParent = null; 4436 children[i] = null; 4437 } 4438 } else { 4439 for (int i = start; i < end; i++) { 4440 children[i].mParent = null; 4441 } 4442 4443 // Since we're looping above, we might as well do the copy, but is arraycopy() 4444 // faster than the extra 2 bounds checks we would do in the loop? 4445 System.arraycopy(children, end, children, start, childrenCount - end); 4446 4447 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 4448 children[i] = null; 4449 } 4450 } 4451 4452 mChildrenCount -= (end - start); 4453 } 4454 4455 private void bindLayoutAnimation(View child) { 4456 Animation a = mLayoutAnimationController.getAnimationForView(child); 4457 child.setAnimation(a); 4458 } 4459 4460 /** 4461 * Subclasses should override this method to set layout animation 4462 * parameters on the supplied child. 4463 * 4464 * @param child the child to associate with animation parameters 4465 * @param params the child's layout parameters which hold the animation 4466 * parameters 4467 * @param index the index of the child in the view group 4468 * @param count the number of children in the view group 4469 */ 4470 protected void attachLayoutAnimationParameters(View child, 4471 LayoutParams params, int index, int count) { 4472 LayoutAnimationController.AnimationParameters animationParams = 4473 params.layoutAnimationParameters; 4474 if (animationParams == null) { 4475 animationParams = new LayoutAnimationController.AnimationParameters(); 4476 params.layoutAnimationParameters = animationParams; 4477 } 4478 4479 animationParams.count = count; 4480 animationParams.index = index; 4481 } 4482 4483 /** 4484 * {@inheritDoc} 4485 * 4486 * <p><strong>Note:</strong> do not invoke this method from 4487 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4488 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4489 */ 4490 @Override 4491 public void removeView(View view) { 4492 if (removeViewInternal(view)) { 4493 requestLayout(); 4494 invalidate(true); 4495 } 4496 } 4497 4498 /** 4499 * Removes a view during layout. This is useful if in your onLayout() method, 4500 * you need to remove more views. 4501 * 4502 * <p><strong>Note:</strong> do not invoke this method from 4503 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4504 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4505 * 4506 * @param view the view to remove from the group 4507 */ 4508 public void removeViewInLayout(View view) { 4509 removeViewInternal(view); 4510 } 4511 4512 /** 4513 * Removes a range of views during layout. This is useful if in your onLayout() method, 4514 * you need to remove more views. 4515 * 4516 * <p><strong>Note:</strong> do not invoke this method from 4517 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4518 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4519 * 4520 * @param start the index of the first view to remove from the group 4521 * @param count the number of views to remove from the group 4522 */ 4523 public void removeViewsInLayout(int start, int count) { 4524 removeViewsInternal(start, count); 4525 } 4526 4527 /** 4528 * Removes the view at the specified position in the group. 4529 * 4530 * <p><strong>Note:</strong> do not invoke this method from 4531 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4532 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4533 * 4534 * @param index the position in the group of the view to remove 4535 */ 4536 public void removeViewAt(int index) { 4537 removeViewInternal(index, getChildAt(index)); 4538 requestLayout(); 4539 invalidate(true); 4540 } 4541 4542 /** 4543 * Removes the specified range of views from the group. 4544 * 4545 * <p><strong>Note:</strong> do not invoke this method from 4546 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4547 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4548 * 4549 * @param start the first position in the group of the range of views to remove 4550 * @param count the number of views to remove 4551 */ 4552 public void removeViews(int start, int count) { 4553 removeViewsInternal(start, count); 4554 requestLayout(); 4555 invalidate(true); 4556 } 4557 4558 private boolean removeViewInternal(View view) { 4559 final int index = indexOfChild(view); 4560 if (index >= 0) { 4561 removeViewInternal(index, view); 4562 return true; 4563 } 4564 return false; 4565 } 4566 4567 private void removeViewInternal(int index, View view) { 4568 if (mTransition != null) { 4569 mTransition.removeChild(this, view); 4570 } 4571 4572 boolean clearChildFocus = false; 4573 if (view == mFocused) { 4574 view.unFocus(null); 4575 clearChildFocus = true; 4576 } 4577 4578 view.clearAccessibilityFocus(); 4579 4580 cancelTouchTarget(view); 4581 cancelHoverTarget(view); 4582 4583 if (view.getAnimation() != null || 4584 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4585 addDisappearingView(view); 4586 } else if (view.mAttachInfo != null) { 4587 view.dispatchDetachedFromWindow(); 4588 } 4589 4590 if (view.hasTransientState()) { 4591 childHasTransientStateChanged(view, false); 4592 } 4593 4594 needGlobalAttributesUpdate(false); 4595 4596 removeFromArray(index); 4597 4598 if (clearChildFocus) { 4599 clearChildFocus(view); 4600 if (!rootViewRequestFocus()) { 4601 notifyGlobalFocusCleared(this); 4602 } 4603 } 4604 4605 dispatchViewRemoved(view); 4606 4607 if (view.getVisibility() != View.GONE) { 4608 notifySubtreeAccessibilityStateChangedIfNeeded(); 4609 } 4610 4611 int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 4612 for (int i = 0; i < transientCount; ++i) { 4613 final int oldIndex = mTransientIndices.get(i); 4614 if (index < oldIndex) { 4615 mTransientIndices.set(i, oldIndex - 1); 4616 } 4617 } 4618 4619 if (mCurrentDragStartEvent != null) { 4620 mChildrenInterestedInDrag.remove(view); 4621 } 4622 } 4623 4624 /** 4625 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4626 * not null, changes in layout which occur because of children being added to or removed from 4627 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4628 * object. By default, the transition object is null (so layout changes are not animated). 4629 * 4630 * <p>Replacing a non-null transition will cause that previous transition to be 4631 * canceled, if it is currently running, to restore this container to 4632 * its correct post-transition state.</p> 4633 * 4634 * @param transition The LayoutTransition object that will animated changes in layout. A value 4635 * of <code>null</code> means no transition will run on layout changes. 4636 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 4637 */ 4638 public void setLayoutTransition(LayoutTransition transition) { 4639 if (mTransition != null) { 4640 LayoutTransition previousTransition = mTransition; 4641 previousTransition.cancel(); 4642 previousTransition.removeTransitionListener(mLayoutTransitionListener); 4643 } 4644 mTransition = transition; 4645 if (mTransition != null) { 4646 mTransition.addTransitionListener(mLayoutTransitionListener); 4647 } 4648 } 4649 4650 /** 4651 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4652 * not null, changes in layout which occur because of children being added to or removed from 4653 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4654 * object. By default, the transition object is null (so layout changes are not animated). 4655 * 4656 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 4657 * A value of <code>null</code> means no transition will run on layout changes. 4658 */ 4659 public LayoutTransition getLayoutTransition() { 4660 return mTransition; 4661 } 4662 4663 private void removeViewsInternal(int start, int count) { 4664 final int end = start + count; 4665 4666 if (start < 0 || count < 0 || end > mChildrenCount) { 4667 throw new IndexOutOfBoundsException(); 4668 } 4669 4670 final View focused = mFocused; 4671 final boolean detach = mAttachInfo != null; 4672 boolean clearChildFocus = false; 4673 4674 final View[] children = mChildren; 4675 4676 for (int i = start; i < end; i++) { 4677 final View view = children[i]; 4678 4679 if (mTransition != null) { 4680 mTransition.removeChild(this, view); 4681 } 4682 4683 if (view == focused) { 4684 view.unFocus(null); 4685 clearChildFocus = true; 4686 } 4687 4688 view.clearAccessibilityFocus(); 4689 4690 cancelTouchTarget(view); 4691 cancelHoverTarget(view); 4692 4693 if (view.getAnimation() != null || 4694 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4695 addDisappearingView(view); 4696 } else if (detach) { 4697 view.dispatchDetachedFromWindow(); 4698 } 4699 4700 if (view.hasTransientState()) { 4701 childHasTransientStateChanged(view, false); 4702 } 4703 4704 needGlobalAttributesUpdate(false); 4705 4706 dispatchViewRemoved(view); 4707 } 4708 4709 removeFromArray(start, count); 4710 4711 if (clearChildFocus) { 4712 clearChildFocus(focused); 4713 if (!rootViewRequestFocus()) { 4714 notifyGlobalFocusCleared(focused); 4715 } 4716 } 4717 } 4718 4719 /** 4720 * Call this method to remove all child views from the 4721 * ViewGroup. 4722 * 4723 * <p><strong>Note:</strong> do not invoke this method from 4724 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4725 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4726 */ 4727 public void removeAllViews() { 4728 removeAllViewsInLayout(); 4729 requestLayout(); 4730 invalidate(true); 4731 } 4732 4733 /** 4734 * Called by a ViewGroup subclass to remove child views from itself, 4735 * when it must first know its size on screen before it can calculate how many 4736 * child views it will render. An example is a Gallery or a ListView, which 4737 * may "have" 50 children, but actually only render the number of children 4738 * that can currently fit inside the object on screen. Do not call 4739 * this method unless you are extending ViewGroup and understand the 4740 * view measuring and layout pipeline. 4741 * 4742 * <p><strong>Note:</strong> do not invoke this method from 4743 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4744 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4745 */ 4746 public void removeAllViewsInLayout() { 4747 final int count = mChildrenCount; 4748 if (count <= 0) { 4749 return; 4750 } 4751 4752 final View[] children = mChildren; 4753 mChildrenCount = 0; 4754 4755 final View focused = mFocused; 4756 final boolean detach = mAttachInfo != null; 4757 boolean clearChildFocus = false; 4758 4759 needGlobalAttributesUpdate(false); 4760 4761 for (int i = count - 1; i >= 0; i--) { 4762 final View view = children[i]; 4763 4764 if (mTransition != null) { 4765 mTransition.removeChild(this, view); 4766 } 4767 4768 if (view == focused) { 4769 view.unFocus(null); 4770 clearChildFocus = true; 4771 } 4772 4773 view.clearAccessibilityFocus(); 4774 4775 cancelTouchTarget(view); 4776 cancelHoverTarget(view); 4777 4778 if (view.getAnimation() != null || 4779 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4780 addDisappearingView(view); 4781 } else if (detach) { 4782 view.dispatchDetachedFromWindow(); 4783 } 4784 4785 if (view.hasTransientState()) { 4786 childHasTransientStateChanged(view, false); 4787 } 4788 4789 dispatchViewRemoved(view); 4790 4791 view.mParent = null; 4792 children[i] = null; 4793 } 4794 4795 if (clearChildFocus) { 4796 clearChildFocus(focused); 4797 if (!rootViewRequestFocus()) { 4798 notifyGlobalFocusCleared(focused); 4799 } 4800 } 4801 } 4802 4803 /** 4804 * Finishes the removal of a detached view. This method will dispatch the detached from 4805 * window event and notify the hierarchy change listener. 4806 * <p> 4807 * This method is intended to be lightweight and makes no assumptions about whether the 4808 * parent or child should be redrawn. Proper use of this method will include also making 4809 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4810 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4811 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4812 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4813 * 4814 * @param child the child to be definitely removed from the view hierarchy 4815 * @param animate if true and the view has an animation, the view is placed in the 4816 * disappearing views list, otherwise, it is detached from the window 4817 * 4818 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4819 * @see #detachAllViewsFromParent() 4820 * @see #detachViewFromParent(View) 4821 * @see #detachViewFromParent(int) 4822 */ 4823 protected void removeDetachedView(View child, boolean animate) { 4824 if (mTransition != null) { 4825 mTransition.removeChild(this, child); 4826 } 4827 4828 if (child == mFocused) { 4829 child.clearFocus(); 4830 } 4831 4832 child.clearAccessibilityFocus(); 4833 4834 cancelTouchTarget(child); 4835 cancelHoverTarget(child); 4836 4837 if ((animate && child.getAnimation() != null) || 4838 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4839 addDisappearingView(child); 4840 } else if (child.mAttachInfo != null) { 4841 child.dispatchDetachedFromWindow(); 4842 } 4843 4844 if (child.hasTransientState()) { 4845 childHasTransientStateChanged(child, false); 4846 } 4847 4848 dispatchViewRemoved(child); 4849 } 4850 4851 /** 4852 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4853 * sets the layout parameters and puts the view in the list of children so that 4854 * it can be retrieved by calling {@link #getChildAt(int)}. 4855 * <p> 4856 * This method is intended to be lightweight and makes no assumptions about whether the 4857 * parent or child should be redrawn. Proper use of this method will include also making 4858 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4859 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4860 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4861 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4862 * <p> 4863 * This method should be called only for views which were detached from their parent. 4864 * 4865 * @param child the child to attach 4866 * @param index the index at which the child should be attached 4867 * @param params the layout parameters of the child 4868 * 4869 * @see #removeDetachedView(View, boolean) 4870 * @see #detachAllViewsFromParent() 4871 * @see #detachViewFromParent(View) 4872 * @see #detachViewFromParent(int) 4873 */ 4874 protected void attachViewToParent(View child, int index, LayoutParams params) { 4875 child.mLayoutParams = params; 4876 4877 if (index < 0) { 4878 index = mChildrenCount; 4879 } 4880 4881 addInArray(child, index); 4882 4883 child.mParent = this; 4884 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4885 & ~PFLAG_DRAWING_CACHE_VALID) 4886 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4887 this.mPrivateFlags |= PFLAG_INVALIDATED; 4888 4889 if (child.hasFocus()) { 4890 requestChildFocus(child, child.findFocus()); 4891 } 4892 } 4893 4894 /** 4895 * Detaches a view from its parent. Detaching a view should be followed 4896 * either by a call to 4897 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4898 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4899 * temporary; reattachment or removal should happen within the same drawing cycle as 4900 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4901 * call to {@link #getChildAt(int)}. 4902 * 4903 * @param child the child to detach 4904 * 4905 * @see #detachViewFromParent(int) 4906 * @see #detachViewsFromParent(int, int) 4907 * @see #detachAllViewsFromParent() 4908 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4909 * @see #removeDetachedView(View, boolean) 4910 */ 4911 protected void detachViewFromParent(View child) { 4912 removeFromArray(indexOfChild(child)); 4913 } 4914 4915 /** 4916 * Detaches a view from its parent. Detaching a view should be followed 4917 * either by a call to 4918 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4919 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4920 * temporary; reattachment or removal should happen within the same drawing cycle as 4921 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4922 * call to {@link #getChildAt(int)}. 4923 * 4924 * @param index the index of the child to detach 4925 * 4926 * @see #detachViewFromParent(View) 4927 * @see #detachAllViewsFromParent() 4928 * @see #detachViewsFromParent(int, int) 4929 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4930 * @see #removeDetachedView(View, boolean) 4931 */ 4932 protected void detachViewFromParent(int index) { 4933 removeFromArray(index); 4934 } 4935 4936 /** 4937 * Detaches a range of views from their parents. Detaching a view should be followed 4938 * either by a call to 4939 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4940 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4941 * temporary; reattachment or removal should happen within the same drawing cycle as 4942 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4943 * call to {@link #getChildAt(int)}. 4944 * 4945 * @param start the first index of the childrend range to detach 4946 * @param count the number of children to detach 4947 * 4948 * @see #detachViewFromParent(View) 4949 * @see #detachViewFromParent(int) 4950 * @see #detachAllViewsFromParent() 4951 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4952 * @see #removeDetachedView(View, boolean) 4953 */ 4954 protected void detachViewsFromParent(int start, int count) { 4955 removeFromArray(start, count); 4956 } 4957 4958 /** 4959 * Detaches all views from the parent. Detaching a view should be followed 4960 * either by a call to 4961 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4962 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4963 * temporary; reattachment or removal should happen within the same drawing cycle as 4964 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4965 * call to {@link #getChildAt(int)}. 4966 * 4967 * @see #detachViewFromParent(View) 4968 * @see #detachViewFromParent(int) 4969 * @see #detachViewsFromParent(int, int) 4970 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4971 * @see #removeDetachedView(View, boolean) 4972 */ 4973 protected void detachAllViewsFromParent() { 4974 final int count = mChildrenCount; 4975 if (count <= 0) { 4976 return; 4977 } 4978 4979 final View[] children = mChildren; 4980 mChildrenCount = 0; 4981 4982 for (int i = count - 1; i >= 0; i--) { 4983 children[i].mParent = null; 4984 children[i] = null; 4985 } 4986 } 4987 4988 /** 4989 * Don't call or override this method. It is used for the implementation of 4990 * the view hierarchy. 4991 */ 4992 @Override 4993 public final void invalidateChild(View child, final Rect dirty) { 4994 ViewParent parent = this; 4995 4996 final AttachInfo attachInfo = mAttachInfo; 4997 if (attachInfo != null) { 4998 // If the child is drawing an animation, we want to copy this flag onto 4999 // ourselves and the parent to make sure the invalidate request goes 5000 // through 5001 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 5002 == PFLAG_DRAW_ANIMATION; 5003 5004 // Check whether the child that requests the invalidate is fully opaque 5005 // Views being animated or transformed are not considered opaque because we may 5006 // be invalidating their old position and need the parent to paint behind them. 5007 Matrix childMatrix = child.getMatrix(); 5008 final boolean isOpaque = child.isOpaque() && !drawAnimation && 5009 child.getAnimation() == null && childMatrix.isIdentity(); 5010 // Mark the child as dirty, using the appropriate flag 5011 // Make sure we do not set both flags at the same time 5012 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 5013 5014 if (child.mLayerType != LAYER_TYPE_NONE) { 5015 mPrivateFlags |= PFLAG_INVALIDATED; 5016 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 5017 } 5018 5019 final int[] location = attachInfo.mInvalidateChildLocation; 5020 location[CHILD_LEFT_INDEX] = child.mLeft; 5021 location[CHILD_TOP_INDEX] = child.mTop; 5022 if (!childMatrix.isIdentity() || 5023 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 5024 RectF boundingRect = attachInfo.mTmpTransformRect; 5025 boundingRect.set(dirty); 5026 Matrix transformMatrix; 5027 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 5028 Transformation t = attachInfo.mTmpTransformation; 5029 boolean transformed = getChildStaticTransformation(child, t); 5030 if (transformed) { 5031 transformMatrix = attachInfo.mTmpMatrix; 5032 transformMatrix.set(t.getMatrix()); 5033 if (!childMatrix.isIdentity()) { 5034 transformMatrix.preConcat(childMatrix); 5035 } 5036 } else { 5037 transformMatrix = childMatrix; 5038 } 5039 } else { 5040 transformMatrix = childMatrix; 5041 } 5042 transformMatrix.mapRect(boundingRect); 5043 dirty.set((int) Math.floor(boundingRect.left), 5044 (int) Math.floor(boundingRect.top), 5045 (int) Math.ceil(boundingRect.right), 5046 (int) Math.ceil(boundingRect.bottom)); 5047 } 5048 5049 do { 5050 View view = null; 5051 if (parent instanceof View) { 5052 view = (View) parent; 5053 } 5054 5055 if (drawAnimation) { 5056 if (view != null) { 5057 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 5058 } else if (parent instanceof ViewRootImpl) { 5059 ((ViewRootImpl) parent).mIsAnimating = true; 5060 } 5061 } 5062 5063 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 5064 // flag coming from the child that initiated the invalidate 5065 if (view != null) { 5066 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 5067 view.getSolidColor() == 0) { 5068 opaqueFlag = PFLAG_DIRTY; 5069 } 5070 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 5071 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 5072 } 5073 } 5074 5075 parent = parent.invalidateChildInParent(location, dirty); 5076 if (view != null) { 5077 // Account for transform on current parent 5078 Matrix m = view.getMatrix(); 5079 if (!m.isIdentity()) { 5080 RectF boundingRect = attachInfo.mTmpTransformRect; 5081 boundingRect.set(dirty); 5082 m.mapRect(boundingRect); 5083 dirty.set((int) Math.floor(boundingRect.left), 5084 (int) Math.floor(boundingRect.top), 5085 (int) Math.ceil(boundingRect.right), 5086 (int) Math.ceil(boundingRect.bottom)); 5087 } 5088 } 5089 } while (parent != null); 5090 } 5091 } 5092 5093 /** 5094 * Don't call or override this method. It is used for the implementation of 5095 * the view hierarchy. 5096 * 5097 * This implementation returns null if this ViewGroup does not have a parent, 5098 * if this ViewGroup is already fully invalidated or if the dirty rectangle 5099 * does not intersect with this ViewGroup's bounds. 5100 */ 5101 @Override 5102 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 5103 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 5104 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 5105 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 5106 FLAG_OPTIMIZE_INVALIDATE) { 5107 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 5108 location[CHILD_TOP_INDEX] - mScrollY); 5109 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 5110 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5111 } 5112 5113 final int left = mLeft; 5114 final int top = mTop; 5115 5116 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 5117 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 5118 dirty.setEmpty(); 5119 } 5120 } 5121 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 5122 5123 location[CHILD_LEFT_INDEX] = left; 5124 location[CHILD_TOP_INDEX] = top; 5125 5126 if (mLayerType != LAYER_TYPE_NONE) { 5127 mPrivateFlags |= PFLAG_INVALIDATED; 5128 } 5129 5130 return mParent; 5131 5132 } else { 5133 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 5134 5135 location[CHILD_LEFT_INDEX] = mLeft; 5136 location[CHILD_TOP_INDEX] = mTop; 5137 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 5138 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 5139 } else { 5140 // in case the dirty rect extends outside the bounds of this container 5141 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5142 } 5143 5144 if (mLayerType != LAYER_TYPE_NONE) { 5145 mPrivateFlags |= PFLAG_INVALIDATED; 5146 } 5147 5148 return mParent; 5149 } 5150 } 5151 5152 return null; 5153 } 5154 5155 /** 5156 * Native-calculated damage path 5157 * Returns false if this path was unable to complete successfully. This means 5158 * it hit a ViewParent it doesn't recognize and needs to fall back to calculating 5159 * damage area 5160 * @hide 5161 */ 5162 public boolean damageChildDeferred(View child) { 5163 ViewParent parent = getParent(); 5164 while (parent != null) { 5165 if (parent instanceof ViewGroup) { 5166 parent = parent.getParent(); 5167 } else if (parent instanceof ViewRootImpl) { 5168 ((ViewRootImpl) parent).invalidate(); 5169 return true; 5170 } else { 5171 parent = null; 5172 } 5173 } 5174 return false; 5175 } 5176 5177 /** 5178 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 5179 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 5180 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 5181 * 5182 * @hide 5183 */ 5184 public void damageChild(View child, final Rect dirty) { 5185 if (damageChildDeferred(child)) { 5186 return; 5187 } 5188 5189 ViewParent parent = this; 5190 5191 final AttachInfo attachInfo = mAttachInfo; 5192 if (attachInfo != null) { 5193 int left = child.mLeft; 5194 int top = child.mTop; 5195 if (!child.getMatrix().isIdentity()) { 5196 child.transformRect(dirty); 5197 } 5198 5199 do { 5200 if (parent instanceof ViewGroup) { 5201 ViewGroup parentVG = (ViewGroup) parent; 5202 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 5203 // Layered parents should be recreated, not just re-issued 5204 parentVG.invalidate(); 5205 parent = null; 5206 } else { 5207 parent = parentVG.damageChildInParent(left, top, dirty); 5208 left = parentVG.mLeft; 5209 top = parentVG.mTop; 5210 } 5211 } else { 5212 // Reached the top; this calls into the usual invalidate method in 5213 // ViewRootImpl, which schedules a traversal 5214 final int[] location = attachInfo.mInvalidateChildLocation; 5215 location[0] = left; 5216 location[1] = top; 5217 parent = parent.invalidateChildInParent(location, dirty); 5218 } 5219 } while (parent != null); 5220 } 5221 } 5222 5223 /** 5224 * Quick invalidation method that simply transforms the dirty rect into the parent's 5225 * coordinate system, pruning the invalidation if the parent has already been invalidated. 5226 * 5227 * @hide 5228 */ 5229 protected ViewParent damageChildInParent(int left, int top, final Rect dirty) { 5230 if ((mPrivateFlags & PFLAG_DRAWN) != 0 5231 || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) != 0) { 5232 dirty.offset(left - mScrollX, top - mScrollY); 5233 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 5234 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5235 } 5236 5237 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 5238 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 5239 5240 if (!getMatrix().isIdentity()) { 5241 transformRect(dirty); 5242 } 5243 5244 return mParent; 5245 } 5246 } 5247 5248 return null; 5249 } 5250 5251 /** 5252 * Offset a rectangle that is in a descendant's coordinate 5253 * space into our coordinate space. 5254 * @param descendant A descendant of this view 5255 * @param rect A rectangle defined in descendant's coordinate space. 5256 */ 5257 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 5258 offsetRectBetweenParentAndChild(descendant, rect, true, false); 5259 } 5260 5261 /** 5262 * Offset a rectangle that is in our coordinate space into an ancestor's 5263 * coordinate space. 5264 * @param descendant A descendant of this view 5265 * @param rect A rectangle defined in descendant's coordinate space. 5266 */ 5267 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 5268 offsetRectBetweenParentAndChild(descendant, rect, false, false); 5269 } 5270 5271 /** 5272 * Helper method that offsets a rect either from parent to descendant or 5273 * descendant to parent. 5274 */ 5275 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 5276 boolean offsetFromChildToParent, boolean clipToBounds) { 5277 5278 final RectF rectF = mAttachInfo != null ? mAttachInfo.mTmpTransformRect1 : new RectF(); 5279 final Matrix inverse = mAttachInfo != null ? mAttachInfo.mTmpMatrix : new Matrix(); 5280 5281 // already in the same coord system :) 5282 if (descendant == this) { 5283 return; 5284 } 5285 5286 ViewParent theParent = descendant.mParent; 5287 5288 // search and offset up to the parent 5289 while ((theParent != null) 5290 && (theParent instanceof View) 5291 && (theParent != this)) { 5292 5293 if (offsetFromChildToParent) { 5294 rect.offset(-descendant.mScrollX, -descendant.mScrollY); 5295 5296 if (!descendant.hasIdentityMatrix()) { 5297 rectF.set(rect); 5298 descendant.getMatrix().mapRect(rectF); 5299 rectF.roundOut(rect); 5300 } 5301 5302 rect.offset(descendant.mLeft, descendant.mTop); 5303 5304 if (clipToBounds) { 5305 View p = (View) theParent; 5306 boolean intersected = rect.intersect(0, 0, p.mRight - p.mLeft, 5307 p.mBottom - p.mTop); 5308 if (!intersected) { 5309 rect.setEmpty(); 5310 } 5311 } 5312 } else { 5313 if (clipToBounds) { 5314 View p = (View) theParent; 5315 boolean intersected = rect.intersect(0, 0, p.mRight - p.mLeft, 5316 p.mBottom - p.mTop); 5317 if (!intersected) { 5318 rect.setEmpty(); 5319 } 5320 } 5321 rect.offset(-descendant.mLeft, -descendant.mTop); 5322 5323 if (!descendant.hasIdentityMatrix()) { 5324 descendant.getMatrix().invert(inverse); 5325 rectF.set(rect); 5326 inverse.mapRect(rectF); 5327 rectF.roundOut(rect); 5328 } 5329 5330 rect.offset(descendant.mScrollX, descendant.mScrollY); 5331 } 5332 5333 descendant = (View) theParent; 5334 theParent = descendant.mParent; 5335 } 5336 5337 // now that we are up to this view, need to offset one more time 5338 // to get into our coordinate space 5339 if (theParent == this) { 5340 if (offsetFromChildToParent) { 5341 rect.offset(-descendant.mScrollX, -descendant.mScrollY); 5342 5343 if (!descendant.hasIdentityMatrix()) { 5344 rectF.set(rect); 5345 descendant.getMatrix().mapRect(rectF); 5346 rectF.roundOut(rect); 5347 } 5348 5349 rect.offset(descendant.mLeft, descendant.mTop); 5350 } else { 5351 rect.offset(-descendant.mLeft, -descendant.mTop); 5352 5353 if (!descendant.hasIdentityMatrix()) { 5354 descendant.getMatrix().invert(inverse); 5355 rectF.set(rect); 5356 inverse.mapRect(rectF); 5357 rectF.roundOut(rect); 5358 } 5359 5360 rect.offset(descendant.mScrollX, descendant.mScrollY); 5361 } 5362 } else { 5363 throw new IllegalArgumentException("parameter must be a descendant of this view"); 5364 } 5365 } 5366 5367 /** 5368 * Offset the vertical location of all children of this view by the specified number of pixels. 5369 * 5370 * @param offset the number of pixels to offset 5371 * 5372 * @hide 5373 */ 5374 public void offsetChildrenTopAndBottom(int offset) { 5375 final int count = mChildrenCount; 5376 final View[] children = mChildren; 5377 boolean invalidate = false; 5378 5379 for (int i = 0; i < count; i++) { 5380 final View v = children[i]; 5381 v.mTop += offset; 5382 v.mBottom += offset; 5383 if (v.mRenderNode != null) { 5384 invalidate = true; 5385 v.mRenderNode.offsetTopAndBottom(offset); 5386 } 5387 } 5388 5389 if (invalidate) { 5390 invalidateViewProperty(false, false); 5391 } 5392 notifySubtreeAccessibilityStateChangedIfNeeded(); 5393 } 5394 5395 @Override 5396 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 5397 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 5398 // but for some simple tests it can be useful. If we don't have attach info this 5399 // will allocate memory. 5400 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 5401 rect.set(r); 5402 5403 if (!child.hasIdentityMatrix()) { 5404 child.getMatrix().mapRect(rect); 5405 } 5406 5407 final int dx = child.mLeft - mScrollX; 5408 final int dy = child.mTop - mScrollY; 5409 5410 rect.offset(dx, dy); 5411 5412 if (offset != null) { 5413 if (!child.hasIdentityMatrix()) { 5414 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 5415 : new float[2]; 5416 position[0] = offset.x; 5417 position[1] = offset.y; 5418 child.getMatrix().mapPoints(position); 5419 offset.x = Math.round(position[0]); 5420 offset.y = Math.round(position[1]); 5421 } 5422 offset.x += dx; 5423 offset.y += dy; 5424 } 5425 5426 final int width = mRight - mLeft; 5427 final int height = mBottom - mTop; 5428 5429 boolean rectIsVisible = true; 5430 if (mParent == null || 5431 (mParent instanceof ViewGroup && ((ViewGroup) mParent).getClipChildren())) { 5432 // Clip to bounds. 5433 rectIsVisible = rect.intersect(0, 0, width, height); 5434 } 5435 5436 if (rectIsVisible && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 5437 // Clip to padding. 5438 rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop, 5439 width - mPaddingRight, height - mPaddingBottom); 5440 } 5441 5442 if (rectIsVisible && mClipBounds != null) { 5443 // Clip to clipBounds. 5444 rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right, 5445 mClipBounds.bottom); 5446 } 5447 r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top), 5448 (int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom)); 5449 if (rectIsVisible && mParent != null) { 5450 rectIsVisible = mParent.getChildVisibleRect(this, r, offset); 5451 } 5452 return rectIsVisible; 5453 } 5454 5455 @Override 5456 public final void layout(int l, int t, int r, int b) { 5457 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 5458 if (mTransition != null) { 5459 mTransition.layoutChange(this); 5460 } 5461 super.layout(l, t, r, b); 5462 } else { 5463 // record the fact that we noop'd it; request layout when transition finishes 5464 mLayoutCalledWhileSuppressed = true; 5465 } 5466 } 5467 5468 @Override 5469 protected abstract void onLayout(boolean changed, 5470 int l, int t, int r, int b); 5471 5472 /** 5473 * Indicates whether the view group has the ability to animate its children 5474 * after the first layout. 5475 * 5476 * @return true if the children can be animated, false otherwise 5477 */ 5478 protected boolean canAnimate() { 5479 return mLayoutAnimationController != null; 5480 } 5481 5482 /** 5483 * Runs the layout animation. Calling this method triggers a relayout of 5484 * this view group. 5485 */ 5486 public void startLayoutAnimation() { 5487 if (mLayoutAnimationController != null) { 5488 mGroupFlags |= FLAG_RUN_ANIMATION; 5489 requestLayout(); 5490 } 5491 } 5492 5493 /** 5494 * Schedules the layout animation to be played after the next layout pass 5495 * of this view group. This can be used to restart the layout animation 5496 * when the content of the view group changes or when the activity is 5497 * paused and resumed. 5498 */ 5499 public void scheduleLayoutAnimation() { 5500 mGroupFlags |= FLAG_RUN_ANIMATION; 5501 } 5502 5503 /** 5504 * Sets the layout animation controller used to animate the group's 5505 * children after the first layout. 5506 * 5507 * @param controller the animation controller 5508 */ 5509 public void setLayoutAnimation(LayoutAnimationController controller) { 5510 mLayoutAnimationController = controller; 5511 if (mLayoutAnimationController != null) { 5512 mGroupFlags |= FLAG_RUN_ANIMATION; 5513 } 5514 } 5515 5516 /** 5517 * Returns the layout animation controller used to animate the group's 5518 * children. 5519 * 5520 * @return the current animation controller 5521 */ 5522 public LayoutAnimationController getLayoutAnimation() { 5523 return mLayoutAnimationController; 5524 } 5525 5526 /** 5527 * Indicates whether the children's drawing cache is used during a layout 5528 * animation. By default, the drawing cache is enabled but this will prevent 5529 * nested layout animations from working. To nest animations, you must disable 5530 * the cache. 5531 * 5532 * @return true if the animation cache is enabled, false otherwise 5533 * 5534 * @see #setAnimationCacheEnabled(boolean) 5535 * @see View#setDrawingCacheEnabled(boolean) 5536 * 5537 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5538 * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}. 5539 */ 5540 public boolean isAnimationCacheEnabled() { 5541 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 5542 } 5543 5544 /** 5545 * Enables or disables the children's drawing cache during a layout animation. 5546 * By default, the drawing cache is enabled but this will prevent nested 5547 * layout animations from working. To nest animations, you must disable the 5548 * cache. 5549 * 5550 * @param enabled true to enable the animation cache, false otherwise 5551 * 5552 * @see #isAnimationCacheEnabled() 5553 * @see View#setDrawingCacheEnabled(boolean) 5554 * 5555 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5556 * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}. 5557 */ 5558 public void setAnimationCacheEnabled(boolean enabled) { 5559 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 5560 } 5561 5562 /** 5563 * Indicates whether this ViewGroup will always try to draw its children using their 5564 * drawing cache. By default this property is enabled. 5565 * 5566 * @return true if the animation cache is enabled, false otherwise 5567 * 5568 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5569 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5570 * @see View#setDrawingCacheEnabled(boolean) 5571 * 5572 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5573 * Child views may no longer have their caching behavior disabled by parents. 5574 */ 5575 public boolean isAlwaysDrawnWithCacheEnabled() { 5576 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 5577 } 5578 5579 /** 5580 * Indicates whether this ViewGroup will always try to draw its children using their 5581 * drawing cache. This property can be set to true when the cache rendering is 5582 * slightly different from the children's normal rendering. Renderings can be different, 5583 * for instance, when the cache's quality is set to low. 5584 * 5585 * When this property is disabled, the ViewGroup will use the drawing cache of its 5586 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 5587 * when to start using the drawing cache and when to stop using it. 5588 * 5589 * @param always true to always draw with the drawing cache, false otherwise 5590 * 5591 * @see #isAlwaysDrawnWithCacheEnabled() 5592 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5593 * @see View#setDrawingCacheEnabled(boolean) 5594 * @see View#setDrawingCacheQuality(int) 5595 * 5596 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5597 * Child views may no longer have their caching behavior disabled by parents. 5598 */ 5599 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 5600 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 5601 } 5602 5603 /** 5604 * Indicates whether the ViewGroup is currently drawing its children using 5605 * their drawing cache. 5606 * 5607 * @return true if children should be drawn with their cache, false otherwise 5608 * 5609 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5610 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5611 * 5612 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5613 * Child views may no longer be forced to cache their rendering state by their parents. 5614 * Use {@link View#setLayerType(int, Paint)} on individual Views instead. 5615 */ 5616 protected boolean isChildrenDrawnWithCacheEnabled() { 5617 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 5618 } 5619 5620 /** 5621 * Tells the ViewGroup to draw its children using their drawing cache. This property 5622 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 5623 * will be used only if it has been enabled. 5624 * 5625 * Subclasses should call this method to start and stop using the drawing cache when 5626 * they perform performance sensitive operations, like scrolling or animating. 5627 * 5628 * @param enabled true if children should be drawn with their cache, false otherwise 5629 * 5630 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5631 * @see #isChildrenDrawnWithCacheEnabled() 5632 * 5633 * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored. 5634 * Child views may no longer be forced to cache their rendering state by their parents. 5635 * Use {@link View#setLayerType(int, Paint)} on individual Views instead. 5636 */ 5637 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 5638 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 5639 } 5640 5641 /** 5642 * Indicates whether the ViewGroup is drawing its children in the order defined by 5643 * {@link #getChildDrawingOrder(int, int)}. 5644 * 5645 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 5646 * false otherwise 5647 * 5648 * @see #setChildrenDrawingOrderEnabled(boolean) 5649 * @see #getChildDrawingOrder(int, int) 5650 */ 5651 @ViewDebug.ExportedProperty(category = "drawing") 5652 protected boolean isChildrenDrawingOrderEnabled() { 5653 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 5654 } 5655 5656 /** 5657 * Tells the ViewGroup whether to draw its children in the order defined by the method 5658 * {@link #getChildDrawingOrder(int, int)}. 5659 * <p> 5660 * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)}, 5661 * will override custom child ordering done via this method. 5662 * 5663 * @param enabled true if the order of the children when drawing is determined by 5664 * {@link #getChildDrawingOrder(int, int)}, false otherwise 5665 * 5666 * @see #isChildrenDrawingOrderEnabled() 5667 * @see #getChildDrawingOrder(int, int) 5668 */ 5669 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 5670 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 5671 } 5672 5673 private boolean hasBooleanFlag(int flag) { 5674 return (mGroupFlags & flag) == flag; 5675 } 5676 5677 private void setBooleanFlag(int flag, boolean value) { 5678 if (value) { 5679 mGroupFlags |= flag; 5680 } else { 5681 mGroupFlags &= ~flag; 5682 } 5683 } 5684 5685 /** 5686 * Returns an integer indicating what types of drawing caches are kept in memory. 5687 * 5688 * @see #setPersistentDrawingCache(int) 5689 * @see #setAnimationCacheEnabled(boolean) 5690 * 5691 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 5692 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5693 * and {@link #PERSISTENT_ALL_CACHES} 5694 */ 5695 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 5696 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 5697 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 5698 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 5699 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 5700 }) 5701 public int getPersistentDrawingCache() { 5702 return mPersistentDrawingCache; 5703 } 5704 5705 /** 5706 * Indicates what types of drawing caches should be kept in memory after 5707 * they have been created. 5708 * 5709 * @see #getPersistentDrawingCache() 5710 * @see #setAnimationCacheEnabled(boolean) 5711 * 5712 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 5713 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5714 * and {@link #PERSISTENT_ALL_CACHES} 5715 */ 5716 public void setPersistentDrawingCache(int drawingCacheToKeep) { 5717 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 5718 } 5719 5720 private void setLayoutMode(int layoutMode, boolean explicitly) { 5721 mLayoutMode = layoutMode; 5722 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 5723 } 5724 5725 /** 5726 * Recursively traverse the view hierarchy, resetting the layoutMode of any 5727 * descendants that had inherited a different layoutMode from a previous parent. 5728 * Recursion terminates when a descendant's mode is: 5729 * <ul> 5730 * <li>Undefined</li> 5731 * <li>The same as the root node's</li> 5732 * <li>A mode that had been explicitly set</li> 5733 * <ul/> 5734 * The first two clauses are optimizations. 5735 * @param layoutModeOfRoot 5736 */ 5737 @Override 5738 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 5739 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 5740 mLayoutMode == layoutModeOfRoot || 5741 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 5742 return; 5743 } 5744 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 5745 5746 // apply recursively 5747 for (int i = 0, N = getChildCount(); i < N; i++) { 5748 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 5749 } 5750 } 5751 5752 /** 5753 * Returns the basis of alignment during layout operations on this ViewGroup: 5754 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5755 * <p> 5756 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 5757 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 5758 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 5759 * 5760 * @return the layout mode to use during layout operations 5761 * 5762 * @see #setLayoutMode(int) 5763 */ 5764 public int getLayoutMode() { 5765 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5766 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5767 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5768 setLayoutMode(inheritedLayoutMode, false); 5769 } 5770 return mLayoutMode; 5771 } 5772 5773 /** 5774 * Sets the basis of alignment during the layout of this ViewGroup. 5775 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5776 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5777 * 5778 * @param layoutMode the layout mode to use during layout operations 5779 * 5780 * @see #getLayoutMode() 5781 * @attr ref android.R.styleable#ViewGroup_layoutMode 5782 */ 5783 public void setLayoutMode(int layoutMode) { 5784 if (mLayoutMode != layoutMode) { 5785 invalidateInheritedLayoutMode(layoutMode); 5786 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5787 requestLayout(); 5788 } 5789 } 5790 5791 /** 5792 * Returns a new set of layout parameters based on the supplied attributes set. 5793 * 5794 * @param attrs the attributes to build the layout parameters from 5795 * 5796 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5797 * of its descendants 5798 */ 5799 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5800 return new LayoutParams(getContext(), attrs); 5801 } 5802 5803 /** 5804 * Returns a safe set of layout parameters based on the supplied layout params. 5805 * When a ViewGroup is passed a View whose layout params do not pass the test of 5806 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5807 * is invoked. This method should return a new set of layout params suitable for 5808 * this ViewGroup, possibly by copying the appropriate attributes from the 5809 * specified set of layout params. 5810 * 5811 * @param p The layout parameters to convert into a suitable set of layout parameters 5812 * for this ViewGroup. 5813 * 5814 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5815 * of its descendants 5816 */ 5817 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5818 return p; 5819 } 5820 5821 /** 5822 * Returns a set of default layout parameters. These parameters are requested 5823 * when the View passed to {@link #addView(View)} has no layout parameters 5824 * already set. If null is returned, an exception is thrown from addView. 5825 * 5826 * @return a set of default layout parameters or null 5827 */ 5828 protected LayoutParams generateDefaultLayoutParams() { 5829 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5830 } 5831 5832 @Override 5833 protected void debug(int depth) { 5834 super.debug(depth); 5835 String output; 5836 5837 if (mFocused != null) { 5838 output = debugIndent(depth); 5839 output += "mFocused"; 5840 Log.d(VIEW_LOG_TAG, output); 5841 } 5842 if (mChildrenCount != 0) { 5843 output = debugIndent(depth); 5844 output += "{"; 5845 Log.d(VIEW_LOG_TAG, output); 5846 } 5847 int count = mChildrenCount; 5848 for (int i = 0; i < count; i++) { 5849 View child = mChildren[i]; 5850 child.debug(depth + 1); 5851 } 5852 5853 if (mChildrenCount != 0) { 5854 output = debugIndent(depth); 5855 output += "}"; 5856 Log.d(VIEW_LOG_TAG, output); 5857 } 5858 } 5859 5860 /** 5861 * Returns the position in the group of the specified child view. 5862 * 5863 * @param child the view for which to get the position 5864 * @return a positive integer representing the position of the view in the 5865 * group, or -1 if the view does not exist in the group 5866 */ 5867 public int indexOfChild(View child) { 5868 final int count = mChildrenCount; 5869 final View[] children = mChildren; 5870 for (int i = 0; i < count; i++) { 5871 if (children[i] == child) { 5872 return i; 5873 } 5874 } 5875 return -1; 5876 } 5877 5878 /** 5879 * Returns the number of children in the group. 5880 * 5881 * @return a positive integer representing the number of children in 5882 * the group 5883 */ 5884 public int getChildCount() { 5885 return mChildrenCount; 5886 } 5887 5888 /** 5889 * Returns the view at the specified position in the group. 5890 * 5891 * @param index the position at which to get the view from 5892 * @return the view at the specified position or null if the position 5893 * does not exist within the group 5894 */ 5895 public View getChildAt(int index) { 5896 if (index < 0 || index >= mChildrenCount) { 5897 return null; 5898 } 5899 return mChildren[index]; 5900 } 5901 5902 /** 5903 * Ask all of the children of this view to measure themselves, taking into 5904 * account both the MeasureSpec requirements for this view and its padding. 5905 * We skip children that are in the GONE state The heavy lifting is done in 5906 * getChildMeasureSpec. 5907 * 5908 * @param widthMeasureSpec The width requirements for this view 5909 * @param heightMeasureSpec The height requirements for this view 5910 */ 5911 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5912 final int size = mChildrenCount; 5913 final View[] children = mChildren; 5914 for (int i = 0; i < size; ++i) { 5915 final View child = children[i]; 5916 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5917 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5918 } 5919 } 5920 } 5921 5922 /** 5923 * Ask one of the children of this view to measure itself, taking into 5924 * account both the MeasureSpec requirements for this view and its padding. 5925 * The heavy lifting is done in getChildMeasureSpec. 5926 * 5927 * @param child The child to measure 5928 * @param parentWidthMeasureSpec The width requirements for this view 5929 * @param parentHeightMeasureSpec The height requirements for this view 5930 */ 5931 protected void measureChild(View child, int parentWidthMeasureSpec, 5932 int parentHeightMeasureSpec) { 5933 final LayoutParams lp = child.getLayoutParams(); 5934 5935 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5936 mPaddingLeft + mPaddingRight, lp.width); 5937 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5938 mPaddingTop + mPaddingBottom, lp.height); 5939 5940 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5941 } 5942 5943 /** 5944 * Ask one of the children of this view to measure itself, taking into 5945 * account both the MeasureSpec requirements for this view and its padding 5946 * and margins. The child must have MarginLayoutParams The heavy lifting is 5947 * done in getChildMeasureSpec. 5948 * 5949 * @param child The child to measure 5950 * @param parentWidthMeasureSpec The width requirements for this view 5951 * @param widthUsed Extra space that has been used up by the parent 5952 * horizontally (possibly by other children of the parent) 5953 * @param parentHeightMeasureSpec The height requirements for this view 5954 * @param heightUsed Extra space that has been used up by the parent 5955 * vertically (possibly by other children of the parent) 5956 */ 5957 protected void measureChildWithMargins(View child, 5958 int parentWidthMeasureSpec, int widthUsed, 5959 int parentHeightMeasureSpec, int heightUsed) { 5960 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5961 5962 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5963 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5964 + widthUsed, lp.width); 5965 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5966 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5967 + heightUsed, lp.height); 5968 5969 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5970 } 5971 5972 /** 5973 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5974 * pass to a particular child. This method figures out the right MeasureSpec 5975 * for one dimension (height or width) of one child view. 5976 * 5977 * The goal is to combine information from our MeasureSpec with the 5978 * LayoutParams of the child to get the best possible results. For example, 5979 * if the this view knows its size (because its MeasureSpec has a mode of 5980 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5981 * to be the same size as the parent, the parent should ask the child to 5982 * layout given an exact size. 5983 * 5984 * @param spec The requirements for this view 5985 * @param padding The padding of this view for the current dimension and 5986 * margins, if applicable 5987 * @param childDimension How big the child wants to be in the current 5988 * dimension 5989 * @return a MeasureSpec integer for the child 5990 */ 5991 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5992 int specMode = MeasureSpec.getMode(spec); 5993 int specSize = MeasureSpec.getSize(spec); 5994 5995 int size = Math.max(0, specSize - padding); 5996 5997 int resultSize = 0; 5998 int resultMode = 0; 5999 6000 switch (specMode) { 6001 // Parent has imposed an exact size on us 6002 case MeasureSpec.EXACTLY: 6003 if (childDimension >= 0) { 6004 resultSize = childDimension; 6005 resultMode = MeasureSpec.EXACTLY; 6006 } else if (childDimension == LayoutParams.MATCH_PARENT) { 6007 // Child wants to be our size. So be it. 6008 resultSize = size; 6009 resultMode = MeasureSpec.EXACTLY; 6010 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 6011 // Child wants to determine its own size. It can't be 6012 // bigger than us. 6013 resultSize = size; 6014 resultMode = MeasureSpec.AT_MOST; 6015 } 6016 break; 6017 6018 // Parent has imposed a maximum size on us 6019 case MeasureSpec.AT_MOST: 6020 if (childDimension >= 0) { 6021 // Child wants a specific size... so be it 6022 resultSize = childDimension; 6023 resultMode = MeasureSpec.EXACTLY; 6024 } else if (childDimension == LayoutParams.MATCH_PARENT) { 6025 // Child wants to be our size, but our size is not fixed. 6026 // Constrain child to not be bigger than us. 6027 resultSize = size; 6028 resultMode = MeasureSpec.AT_MOST; 6029 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 6030 // Child wants to determine its own size. It can't be 6031 // bigger than us. 6032 resultSize = size; 6033 resultMode = MeasureSpec.AT_MOST; 6034 } 6035 break; 6036 6037 // Parent asked to see how big we want to be 6038 case MeasureSpec.UNSPECIFIED: 6039 if (childDimension >= 0) { 6040 // Child wants a specific size... let him have it 6041 resultSize = childDimension; 6042 resultMode = MeasureSpec.EXACTLY; 6043 } else if (childDimension == LayoutParams.MATCH_PARENT) { 6044 // Child wants to be our size... find out how big it should 6045 // be 6046 resultSize = View.sUseZeroUnspecifiedMeasureSpec ? 0 : size; 6047 resultMode = MeasureSpec.UNSPECIFIED; 6048 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 6049 // Child wants to determine its own size.... find out how 6050 // big it should be 6051 resultSize = View.sUseZeroUnspecifiedMeasureSpec ? 0 : size; 6052 resultMode = MeasureSpec.UNSPECIFIED; 6053 } 6054 break; 6055 } 6056 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 6057 } 6058 6059 6060 /** 6061 * Removes any pending animations for views that have been removed. Call 6062 * this if you don't want animations for exiting views to stack up. 6063 */ 6064 public void clearDisappearingChildren() { 6065 final ArrayList<View> disappearingChildren = mDisappearingChildren; 6066 if (disappearingChildren != null) { 6067 final int count = disappearingChildren.size(); 6068 for (int i = 0; i < count; i++) { 6069 final View view = disappearingChildren.get(i); 6070 if (view.mAttachInfo != null) { 6071 view.dispatchDetachedFromWindow(); 6072 } 6073 view.clearAnimation(); 6074 } 6075 disappearingChildren.clear(); 6076 invalidate(); 6077 } 6078 } 6079 6080 /** 6081 * Add a view which is removed from mChildren but still needs animation 6082 * 6083 * @param v View to add 6084 */ 6085 private void addDisappearingView(View v) { 6086 ArrayList<View> disappearingChildren = mDisappearingChildren; 6087 6088 if (disappearingChildren == null) { 6089 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 6090 } 6091 6092 disappearingChildren.add(v); 6093 } 6094 6095 /** 6096 * Cleanup a view when its animation is done. This may mean removing it from 6097 * the list of disappearing views. 6098 * 6099 * @param view The view whose animation has finished 6100 * @param animation The animation, cannot be null 6101 */ 6102 void finishAnimatingView(final View view, Animation animation) { 6103 final ArrayList<View> disappearingChildren = mDisappearingChildren; 6104 if (disappearingChildren != null) { 6105 if (disappearingChildren.contains(view)) { 6106 disappearingChildren.remove(view); 6107 6108 if (view.mAttachInfo != null) { 6109 view.dispatchDetachedFromWindow(); 6110 } 6111 6112 view.clearAnimation(); 6113 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 6114 } 6115 } 6116 6117 if (animation != null && !animation.getFillAfter()) { 6118 view.clearAnimation(); 6119 } 6120 6121 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 6122 view.onAnimationEnd(); 6123 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 6124 // so we'd rather be safe than sorry 6125 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 6126 // Draw one more frame after the animation is done 6127 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 6128 } 6129 } 6130 6131 /** 6132 * Utility function called by View during invalidation to determine whether a view that 6133 * is invisible or gone should still be invalidated because it is being transitioned (and 6134 * therefore still needs to be drawn). 6135 */ 6136 boolean isViewTransitioning(View view) { 6137 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 6138 } 6139 6140 /** 6141 * This method tells the ViewGroup that the given View object, which should have this 6142 * ViewGroup as its parent, 6143 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 6144 * is removed from its parent. This allows animations, such as those used by 6145 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 6146 * the removal of views. A call to this method should always be accompanied by a later call 6147 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 6148 * so that the View finally gets removed. 6149 * 6150 * @param view The View object to be kept visible even if it gets removed from its parent. 6151 */ 6152 public void startViewTransition(View view) { 6153 if (view.mParent == this) { 6154 if (mTransitioningViews == null) { 6155 mTransitioningViews = new ArrayList<View>(); 6156 } 6157 mTransitioningViews.add(view); 6158 } 6159 } 6160 6161 /** 6162 * This method should always be called following an earlier call to 6163 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 6164 * and will no longer be displayed. Note that this method does not perform the functionality 6165 * of removing a view from its parent; it just discontinues the display of a View that 6166 * has previously been removed. 6167 * 6168 * @return view The View object that has been removed but is being kept around in the visible 6169 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 6170 */ 6171 public void endViewTransition(View view) { 6172 if (mTransitioningViews != null) { 6173 mTransitioningViews.remove(view); 6174 final ArrayList<View> disappearingChildren = mDisappearingChildren; 6175 if (disappearingChildren != null && disappearingChildren.contains(view)) { 6176 disappearingChildren.remove(view); 6177 if (mVisibilityChangingChildren != null && 6178 mVisibilityChangingChildren.contains(view)) { 6179 mVisibilityChangingChildren.remove(view); 6180 } else { 6181 if (view.mAttachInfo != null) { 6182 view.dispatchDetachedFromWindow(); 6183 } 6184 if (view.mParent != null) { 6185 view.mParent = null; 6186 } 6187 } 6188 invalidate(); 6189 } 6190 } 6191 } 6192 6193 private LayoutTransition.TransitionListener mLayoutTransitionListener = 6194 new LayoutTransition.TransitionListener() { 6195 @Override 6196 public void startTransition(LayoutTransition transition, ViewGroup container, 6197 View view, int transitionType) { 6198 // We only care about disappearing items, since we need special logic to keep 6199 // those items visible after they've been 'removed' 6200 if (transitionType == LayoutTransition.DISAPPEARING) { 6201 startViewTransition(view); 6202 } 6203 } 6204 6205 @Override 6206 public void endTransition(LayoutTransition transition, ViewGroup container, 6207 View view, int transitionType) { 6208 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 6209 requestLayout(); 6210 mLayoutCalledWhileSuppressed = false; 6211 } 6212 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 6213 endViewTransition(view); 6214 } 6215 } 6216 }; 6217 6218 /** 6219 * Tells this ViewGroup to suppress all layout() calls until layout 6220 * suppression is disabled with a later call to suppressLayout(false). 6221 * When layout suppression is disabled, a requestLayout() call is sent 6222 * if layout() was attempted while layout was being suppressed. 6223 * 6224 * @hide 6225 */ 6226 public void suppressLayout(boolean suppress) { 6227 mSuppressLayout = suppress; 6228 if (!suppress) { 6229 if (mLayoutCalledWhileSuppressed) { 6230 requestLayout(); 6231 mLayoutCalledWhileSuppressed = false; 6232 } 6233 } 6234 } 6235 6236 /** 6237 * Returns whether layout calls on this container are currently being 6238 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 6239 * 6240 * @return true if layout calls are currently suppressed, false otherwise. 6241 * 6242 * @hide 6243 */ 6244 public boolean isLayoutSuppressed() { 6245 return mSuppressLayout; 6246 } 6247 6248 @Override 6249 public boolean gatherTransparentRegion(Region region) { 6250 // If no transparent regions requested, we are always opaque. 6251 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 6252 if (meOpaque && region == null) { 6253 // The caller doesn't care about the region, so stop now. 6254 return true; 6255 } 6256 super.gatherTransparentRegion(region); 6257 final View[] children = mChildren; 6258 final int count = mChildrenCount; 6259 boolean noneOfTheChildrenAreTransparent = true; 6260 for (int i = 0; i < count; i++) { 6261 final View child = children[i]; 6262 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 6263 if (!child.gatherTransparentRegion(region)) { 6264 noneOfTheChildrenAreTransparent = false; 6265 } 6266 } 6267 } 6268 return meOpaque || noneOfTheChildrenAreTransparent; 6269 } 6270 6271 @Override 6272 public void requestTransparentRegion(View child) { 6273 if (child != null) { 6274 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 6275 if (mParent != null) { 6276 mParent.requestTransparentRegion(this); 6277 } 6278 } 6279 } 6280 6281 @Override 6282 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 6283 insets = super.dispatchApplyWindowInsets(insets); 6284 if (!insets.isConsumed()) { 6285 final int count = getChildCount(); 6286 for (int i = 0; i < count; i++) { 6287 insets = getChildAt(i).dispatchApplyWindowInsets(insets); 6288 if (insets.isConsumed()) { 6289 break; 6290 } 6291 } 6292 } 6293 return insets; 6294 } 6295 6296 /** 6297 * Returns the animation listener to which layout animation events are 6298 * sent. 6299 * 6300 * @return an {@link android.view.animation.Animation.AnimationListener} 6301 */ 6302 public Animation.AnimationListener getLayoutAnimationListener() { 6303 return mAnimationListener; 6304 } 6305 6306 @Override 6307 protected void drawableStateChanged() { 6308 super.drawableStateChanged(); 6309 6310 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 6311 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6312 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 6313 + " child has duplicateParentState set to true"); 6314 } 6315 6316 final View[] children = mChildren; 6317 final int count = mChildrenCount; 6318 6319 for (int i = 0; i < count; i++) { 6320 final View child = children[i]; 6321 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 6322 child.refreshDrawableState(); 6323 } 6324 } 6325 } 6326 } 6327 6328 @Override 6329 public void jumpDrawablesToCurrentState() { 6330 super.jumpDrawablesToCurrentState(); 6331 final View[] children = mChildren; 6332 final int count = mChildrenCount; 6333 for (int i = 0; i < count; i++) { 6334 children[i].jumpDrawablesToCurrentState(); 6335 } 6336 } 6337 6338 @Override 6339 protected int[] onCreateDrawableState(int extraSpace) { 6340 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 6341 return super.onCreateDrawableState(extraSpace); 6342 } 6343 6344 int need = 0; 6345 int n = getChildCount(); 6346 for (int i = 0; i < n; i++) { 6347 int[] childState = getChildAt(i).getDrawableState(); 6348 6349 if (childState != null) { 6350 need += childState.length; 6351 } 6352 } 6353 6354 int[] state = super.onCreateDrawableState(extraSpace + need); 6355 6356 for (int i = 0; i < n; i++) { 6357 int[] childState = getChildAt(i).getDrawableState(); 6358 6359 if (childState != null) { 6360 state = mergeDrawableStates(state, childState); 6361 } 6362 } 6363 6364 return state; 6365 } 6366 6367 /** 6368 * Sets whether this ViewGroup's drawable states also include 6369 * its children's drawable states. This is used, for example, to 6370 * make a group appear to be focused when its child EditText or button 6371 * is focused. 6372 */ 6373 public void setAddStatesFromChildren(boolean addsStates) { 6374 if (addsStates) { 6375 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 6376 } else { 6377 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 6378 } 6379 6380 refreshDrawableState(); 6381 } 6382 6383 /** 6384 * Returns whether this ViewGroup's drawable states also include 6385 * its children's drawable states. This is used, for example, to 6386 * make a group appear to be focused when its child EditText or button 6387 * is focused. 6388 */ 6389 public boolean addStatesFromChildren() { 6390 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 6391 } 6392 6393 /** 6394 * If {@link #addStatesFromChildren} is true, refreshes this group's 6395 * drawable state (to include the states from its children). 6396 */ 6397 @Override 6398 public void childDrawableStateChanged(View child) { 6399 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6400 refreshDrawableState(); 6401 } 6402 } 6403 6404 /** 6405 * Specifies the animation listener to which layout animation events must 6406 * be sent. Only 6407 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 6408 * and 6409 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 6410 * are invoked. 6411 * 6412 * @param animationListener the layout animation listener 6413 */ 6414 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 6415 mAnimationListener = animationListener; 6416 } 6417 6418 /** 6419 * This method is called by LayoutTransition when there are 'changing' animations that need 6420 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 6421 * starts all pending transitions prior to the drawing phase in the current traversal. 6422 * 6423 * @param transition The LayoutTransition to be started on the next traversal. 6424 * 6425 * @hide 6426 */ 6427 public void requestTransitionStart(LayoutTransition transition) { 6428 ViewRootImpl viewAncestor = getViewRootImpl(); 6429 if (viewAncestor != null) { 6430 viewAncestor.requestTransitionStart(transition); 6431 } 6432 } 6433 6434 /** 6435 * @hide 6436 */ 6437 @Override 6438 public boolean resolveRtlPropertiesIfNeeded() { 6439 final boolean result = super.resolveRtlPropertiesIfNeeded(); 6440 // We dont need to resolve the children RTL properties if nothing has changed for the parent 6441 if (result) { 6442 int count = getChildCount(); 6443 for (int i = 0; i < count; i++) { 6444 final View child = getChildAt(i); 6445 if (child.isLayoutDirectionInherited()) { 6446 child.resolveRtlPropertiesIfNeeded(); 6447 } 6448 } 6449 } 6450 return result; 6451 } 6452 6453 /** 6454 * @hide 6455 */ 6456 @Override 6457 public boolean resolveLayoutDirection() { 6458 final boolean result = super.resolveLayoutDirection(); 6459 if (result) { 6460 int count = getChildCount(); 6461 for (int i = 0; i < count; i++) { 6462 final View child = getChildAt(i); 6463 if (child.isLayoutDirectionInherited()) { 6464 child.resolveLayoutDirection(); 6465 } 6466 } 6467 } 6468 return result; 6469 } 6470 6471 /** 6472 * @hide 6473 */ 6474 @Override 6475 public boolean resolveTextDirection() { 6476 final boolean result = super.resolveTextDirection(); 6477 if (result) { 6478 int count = getChildCount(); 6479 for (int i = 0; i < count; i++) { 6480 final View child = getChildAt(i); 6481 if (child.isTextDirectionInherited()) { 6482 child.resolveTextDirection(); 6483 } 6484 } 6485 } 6486 return result; 6487 } 6488 6489 /** 6490 * @hide 6491 */ 6492 @Override 6493 public boolean resolveTextAlignment() { 6494 final boolean result = super.resolveTextAlignment(); 6495 if (result) { 6496 int count = getChildCount(); 6497 for (int i = 0; i < count; i++) { 6498 final View child = getChildAt(i); 6499 if (child.isTextAlignmentInherited()) { 6500 child.resolveTextAlignment(); 6501 } 6502 } 6503 } 6504 return result; 6505 } 6506 6507 /** 6508 * @hide 6509 */ 6510 @Override 6511 public void resolvePadding() { 6512 super.resolvePadding(); 6513 int count = getChildCount(); 6514 for (int i = 0; i < count; i++) { 6515 final View child = getChildAt(i); 6516 if (child.isLayoutDirectionInherited() && !child.isPaddingResolved()) { 6517 child.resolvePadding(); 6518 } 6519 } 6520 } 6521 6522 /** 6523 * @hide 6524 */ 6525 @Override 6526 protected void resolveDrawables() { 6527 super.resolveDrawables(); 6528 int count = getChildCount(); 6529 for (int i = 0; i < count; i++) { 6530 final View child = getChildAt(i); 6531 if (child.isLayoutDirectionInherited() && !child.areDrawablesResolved()) { 6532 child.resolveDrawables(); 6533 } 6534 } 6535 } 6536 6537 /** 6538 * @hide 6539 */ 6540 @Override 6541 public void resolveLayoutParams() { 6542 super.resolveLayoutParams(); 6543 int count = getChildCount(); 6544 for (int i = 0; i < count; i++) { 6545 final View child = getChildAt(i); 6546 child.resolveLayoutParams(); 6547 } 6548 } 6549 6550 /** 6551 * @hide 6552 */ 6553 @Override 6554 public void resetResolvedLayoutDirection() { 6555 super.resetResolvedLayoutDirection(); 6556 6557 int count = getChildCount(); 6558 for (int i = 0; i < count; i++) { 6559 final View child = getChildAt(i); 6560 if (child.isLayoutDirectionInherited()) { 6561 child.resetResolvedLayoutDirection(); 6562 } 6563 } 6564 } 6565 6566 /** 6567 * @hide 6568 */ 6569 @Override 6570 public void resetResolvedTextDirection() { 6571 super.resetResolvedTextDirection(); 6572 6573 int count = getChildCount(); 6574 for (int i = 0; i < count; i++) { 6575 final View child = getChildAt(i); 6576 if (child.isTextDirectionInherited()) { 6577 child.resetResolvedTextDirection(); 6578 } 6579 } 6580 } 6581 6582 /** 6583 * @hide 6584 */ 6585 @Override 6586 public void resetResolvedTextAlignment() { 6587 super.resetResolvedTextAlignment(); 6588 6589 int count = getChildCount(); 6590 for (int i = 0; i < count; i++) { 6591 final View child = getChildAt(i); 6592 if (child.isTextAlignmentInherited()) { 6593 child.resetResolvedTextAlignment(); 6594 } 6595 } 6596 } 6597 6598 /** 6599 * @hide 6600 */ 6601 @Override 6602 public void resetResolvedPadding() { 6603 super.resetResolvedPadding(); 6604 6605 int count = getChildCount(); 6606 for (int i = 0; i < count; i++) { 6607 final View child = getChildAt(i); 6608 if (child.isLayoutDirectionInherited()) { 6609 child.resetResolvedPadding(); 6610 } 6611 } 6612 } 6613 6614 /** 6615 * @hide 6616 */ 6617 @Override 6618 protected void resetResolvedDrawables() { 6619 super.resetResolvedDrawables(); 6620 6621 int count = getChildCount(); 6622 for (int i = 0; i < count; i++) { 6623 final View child = getChildAt(i); 6624 if (child.isLayoutDirectionInherited()) { 6625 child.resetResolvedDrawables(); 6626 } 6627 } 6628 } 6629 6630 /** 6631 * Return true if the pressed state should be delayed for children or descendants of this 6632 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 6633 * This prevents the pressed state from appearing when the user is actually trying to scroll 6634 * the content. 6635 * 6636 * The default implementation returns true for compatibility reasons. Subclasses that do 6637 * not scroll should generally override this method and return false. 6638 */ 6639 public boolean shouldDelayChildPressedState() { 6640 return true; 6641 } 6642 6643 /** 6644 * @inheritDoc 6645 */ 6646 @Override 6647 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 6648 return false; 6649 } 6650 6651 /** 6652 * @inheritDoc 6653 */ 6654 @Override 6655 public void onNestedScrollAccepted(View child, View target, int axes) { 6656 mNestedScrollAxes = axes; 6657 } 6658 6659 /** 6660 * @inheritDoc 6661 * 6662 * <p>The default implementation of onStopNestedScroll calls 6663 * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p> 6664 */ 6665 @Override 6666 public void onStopNestedScroll(View child) { 6667 // Stop any recursive nested scrolling. 6668 stopNestedScroll(); 6669 mNestedScrollAxes = 0; 6670 } 6671 6672 /** 6673 * @inheritDoc 6674 */ 6675 @Override 6676 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 6677 int dxUnconsumed, int dyUnconsumed) { 6678 // Do nothing 6679 } 6680 6681 /** 6682 * @inheritDoc 6683 */ 6684 @Override 6685 public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 6686 // Do nothing 6687 } 6688 6689 /** 6690 * @inheritDoc 6691 */ 6692 @Override 6693 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 6694 return false; 6695 } 6696 6697 /** 6698 * @inheritDoc 6699 */ 6700 @Override 6701 public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 6702 return false; 6703 } 6704 6705 /** 6706 * Return the current axes of nested scrolling for this ViewGroup. 6707 * 6708 * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently 6709 * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p> 6710 * 6711 * @return Flags indicating the current axes of nested scrolling 6712 * @see #SCROLL_AXIS_HORIZONTAL 6713 * @see #SCROLL_AXIS_VERTICAL 6714 * @see #SCROLL_AXIS_NONE 6715 */ 6716 public int getNestedScrollAxes() { 6717 return mNestedScrollAxes; 6718 } 6719 6720 /** @hide */ 6721 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 6722 } 6723 6724 /** @hide */ 6725 @Override 6726 public void captureTransitioningViews(List<View> transitioningViews) { 6727 if (getVisibility() != View.VISIBLE) { 6728 return; 6729 } 6730 if (isTransitionGroup()) { 6731 transitioningViews.add(this); 6732 } else { 6733 int count = getChildCount(); 6734 for (int i = 0; i < count; i++) { 6735 View child = getChildAt(i); 6736 child.captureTransitioningViews(transitioningViews); 6737 } 6738 } 6739 } 6740 6741 /** @hide */ 6742 @Override 6743 public void findNamedViews(Map<String, View> namedElements) { 6744 if (getVisibility() != VISIBLE && mGhostView == null) { 6745 return; 6746 } 6747 super.findNamedViews(namedElements); 6748 int count = getChildCount(); 6749 for (int i = 0; i < count; i++) { 6750 View child = getChildAt(i); 6751 child.findNamedViews(namedElements); 6752 } 6753 } 6754 6755 /** 6756 * LayoutParams are used by views to tell their parents how they want to be 6757 * laid out. See 6758 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 6759 * for a list of all child view attributes that this class supports. 6760 * 6761 * <p> 6762 * The base LayoutParams class just describes how big the view wants to be 6763 * for both width and height. For each dimension, it can specify one of: 6764 * <ul> 6765 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 6766 * means that the view wants to be as big as its parent (minus padding) 6767 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 6768 * to enclose its content (plus padding) 6769 * <li> an exact number 6770 * </ul> 6771 * There are subclasses of LayoutParams for different subclasses of 6772 * ViewGroup. For example, AbsoluteLayout has its own subclass of 6773 * LayoutParams which adds an X and Y value.</p> 6774 * 6775 * <div class="special reference"> 6776 * <h3>Developer Guides</h3> 6777 * <p>For more information about creating user interface layouts, read the 6778 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 6779 * guide.</p></div> 6780 * 6781 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 6782 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 6783 */ 6784 public static class LayoutParams { 6785 /** 6786 * Special value for the height or width requested by a View. 6787 * FILL_PARENT means that the view wants to be as big as its parent, 6788 * minus the parent's padding, if any. This value is deprecated 6789 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 6790 */ 6791 @SuppressWarnings({"UnusedDeclaration"}) 6792 @Deprecated 6793 public static final int FILL_PARENT = -1; 6794 6795 /** 6796 * Special value for the height or width requested by a View. 6797 * MATCH_PARENT means that the view wants to be as big as its parent, 6798 * minus the parent's padding, if any. Introduced in API Level 8. 6799 */ 6800 public static final int MATCH_PARENT = -1; 6801 6802 /** 6803 * Special value for the height or width requested by a View. 6804 * WRAP_CONTENT means that the view wants to be just large enough to fit 6805 * its own internal content, taking its own padding into account. 6806 */ 6807 public static final int WRAP_CONTENT = -2; 6808 6809 /** 6810 * Information about how wide the view wants to be. Can be one of the 6811 * constants FILL_PARENT (replaced by MATCH_PARENT 6812 * in API Level 8) or WRAP_CONTENT, or an exact size. 6813 */ 6814 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6815 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6816 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6817 }) 6818 public int width; 6819 6820 /** 6821 * Information about how tall the view wants to be. Can be one of the 6822 * constants FILL_PARENT (replaced by MATCH_PARENT 6823 * in API Level 8) or WRAP_CONTENT, or an exact size. 6824 */ 6825 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6826 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6827 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6828 }) 6829 public int height; 6830 6831 /** 6832 * Used to animate layouts. 6833 */ 6834 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 6835 6836 /** 6837 * Creates a new set of layout parameters. The values are extracted from 6838 * the supplied attributes set and context. The XML attributes mapped 6839 * to this set of layout parameters are: 6840 * 6841 * <ul> 6842 * <li><code>layout_width</code>: the width, either an exact value, 6843 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6844 * {@link #MATCH_PARENT} in API Level 8)</li> 6845 * <li><code>layout_height</code>: the height, either an exact value, 6846 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6847 * {@link #MATCH_PARENT} in API Level 8)</li> 6848 * </ul> 6849 * 6850 * @param c the application environment 6851 * @param attrs the set of attributes from which to extract the layout 6852 * parameters' values 6853 */ 6854 public LayoutParams(Context c, AttributeSet attrs) { 6855 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 6856 setBaseAttributes(a, 6857 R.styleable.ViewGroup_Layout_layout_width, 6858 R.styleable.ViewGroup_Layout_layout_height); 6859 a.recycle(); 6860 } 6861 6862 /** 6863 * Creates a new set of layout parameters with the specified width 6864 * and height. 6865 * 6866 * @param width the width, either {@link #WRAP_CONTENT}, 6867 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6868 * API Level 8), or a fixed size in pixels 6869 * @param height the height, either {@link #WRAP_CONTENT}, 6870 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6871 * API Level 8), or a fixed size in pixels 6872 */ 6873 public LayoutParams(int width, int height) { 6874 this.width = width; 6875 this.height = height; 6876 } 6877 6878 /** 6879 * Copy constructor. Clones the width and height values of the source. 6880 * 6881 * @param source The layout params to copy from. 6882 */ 6883 public LayoutParams(LayoutParams source) { 6884 this.width = source.width; 6885 this.height = source.height; 6886 } 6887 6888 /** 6889 * Used internally by MarginLayoutParams. 6890 * @hide 6891 */ 6892 LayoutParams() { 6893 } 6894 6895 /** 6896 * Extracts the layout parameters from the supplied attributes. 6897 * 6898 * @param a the style attributes to extract the parameters from 6899 * @param widthAttr the identifier of the width attribute 6900 * @param heightAttr the identifier of the height attribute 6901 */ 6902 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6903 width = a.getLayoutDimension(widthAttr, "layout_width"); 6904 height = a.getLayoutDimension(heightAttr, "layout_height"); 6905 } 6906 6907 /** 6908 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6909 * layoutDirection changes should override this method. The default implementation does 6910 * nothing. 6911 * 6912 * @param layoutDirection the direction of the layout 6913 * 6914 * {@link View#LAYOUT_DIRECTION_LTR} 6915 * {@link View#LAYOUT_DIRECTION_RTL} 6916 */ 6917 public void resolveLayoutDirection(int layoutDirection) { 6918 } 6919 6920 /** 6921 * Returns a String representation of this set of layout parameters. 6922 * 6923 * @param output the String to prepend to the internal representation 6924 * @return a String with the following format: output + 6925 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6926 * 6927 * @hide 6928 */ 6929 public String debug(String output) { 6930 return output + "ViewGroup.LayoutParams={ width=" 6931 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6932 } 6933 6934 /** 6935 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6936 * 6937 * @param view the view that contains these layout parameters 6938 * @param canvas the canvas on which to draw 6939 * 6940 * @hide 6941 */ 6942 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6943 } 6944 6945 /** 6946 * Converts the specified size to a readable String. 6947 * 6948 * @param size the size to convert 6949 * @return a String instance representing the supplied size 6950 * 6951 * @hide 6952 */ 6953 protected static String sizeToString(int size) { 6954 if (size == WRAP_CONTENT) { 6955 return "wrap-content"; 6956 } 6957 if (size == MATCH_PARENT) { 6958 return "match-parent"; 6959 } 6960 return String.valueOf(size); 6961 } 6962 6963 /** @hide */ 6964 void encode(@NonNull ViewHierarchyEncoder encoder) { 6965 encoder.beginObject(this); 6966 encodeProperties(encoder); 6967 encoder.endObject(); 6968 } 6969 6970 /** @hide */ 6971 protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) { 6972 encoder.addProperty("width", width); 6973 encoder.addProperty("height", height); 6974 } 6975 } 6976 6977 /** 6978 * Per-child layout information for layouts that support margins. 6979 * See 6980 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6981 * for a list of all child view attributes that this class supports. 6982 */ 6983 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6984 /** 6985 * The left margin in pixels of the child. Margin values should be positive. 6986 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6987 * to this field. 6988 */ 6989 @ViewDebug.ExportedProperty(category = "layout") 6990 public int leftMargin; 6991 6992 /** 6993 * The top margin in pixels of the child. Margin values should be positive. 6994 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6995 * to this field. 6996 */ 6997 @ViewDebug.ExportedProperty(category = "layout") 6998 public int topMargin; 6999 7000 /** 7001 * The right margin in pixels of the child. Margin values should be positive. 7002 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 7003 * to this field. 7004 */ 7005 @ViewDebug.ExportedProperty(category = "layout") 7006 public int rightMargin; 7007 7008 /** 7009 * The bottom margin in pixels of the child. Margin values should be positive. 7010 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 7011 * to this field. 7012 */ 7013 @ViewDebug.ExportedProperty(category = "layout") 7014 public int bottomMargin; 7015 7016 /** 7017 * The start margin in pixels of the child. Margin values should be positive. 7018 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 7019 * to this field. 7020 */ 7021 @ViewDebug.ExportedProperty(category = "layout") 7022 private int startMargin = DEFAULT_MARGIN_RELATIVE; 7023 7024 /** 7025 * The end margin in pixels of the child. Margin values should be positive. 7026 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 7027 * to this field. 7028 */ 7029 @ViewDebug.ExportedProperty(category = "layout") 7030 private int endMargin = DEFAULT_MARGIN_RELATIVE; 7031 7032 /** 7033 * The default start and end margin. 7034 * @hide 7035 */ 7036 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 7037 7038 /** 7039 * Bit 0: layout direction 7040 * Bit 1: layout direction 7041 * Bit 2: left margin undefined 7042 * Bit 3: right margin undefined 7043 * Bit 4: is RTL compatibility mode 7044 * Bit 5: need resolution 7045 * 7046 * Bit 6 to 7 not used 7047 * 7048 * @hide 7049 */ 7050 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 7051 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 7052 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 7053 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 7054 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 7055 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 7056 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 7057 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 7058 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 7059 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 7060 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 7061 }, formatToHexString = true) 7062 byte mMarginFlags; 7063 7064 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 7065 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 7066 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 7067 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 7068 private static final int NEED_RESOLUTION_MASK = 0x00000020; 7069 7070 private static final int DEFAULT_MARGIN_RESOLVED = 0; 7071 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 7072 7073 /** 7074 * Creates a new set of layout parameters. The values are extracted from 7075 * the supplied attributes set and context. 7076 * 7077 * @param c the application environment 7078 * @param attrs the set of attributes from which to extract the layout 7079 * parameters' values 7080 */ 7081 public MarginLayoutParams(Context c, AttributeSet attrs) { 7082 super(); 7083 7084 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 7085 setBaseAttributes(a, 7086 R.styleable.ViewGroup_MarginLayout_layout_width, 7087 R.styleable.ViewGroup_MarginLayout_layout_height); 7088 7089 int margin = a.getDimensionPixelSize( 7090 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 7091 if (margin >= 0) { 7092 leftMargin = margin; 7093 topMargin = margin; 7094 rightMargin= margin; 7095 bottomMargin = margin; 7096 } else { 7097 leftMargin = a.getDimensionPixelSize( 7098 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 7099 UNDEFINED_MARGIN); 7100 if (leftMargin == UNDEFINED_MARGIN) { 7101 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 7102 leftMargin = DEFAULT_MARGIN_RESOLVED; 7103 } 7104 rightMargin = a.getDimensionPixelSize( 7105 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 7106 UNDEFINED_MARGIN); 7107 if (rightMargin == UNDEFINED_MARGIN) { 7108 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 7109 rightMargin = DEFAULT_MARGIN_RESOLVED; 7110 } 7111 7112 topMargin = a.getDimensionPixelSize( 7113 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 7114 DEFAULT_MARGIN_RESOLVED); 7115 bottomMargin = a.getDimensionPixelSize( 7116 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 7117 DEFAULT_MARGIN_RESOLVED); 7118 7119 startMargin = a.getDimensionPixelSize( 7120 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 7121 DEFAULT_MARGIN_RELATIVE); 7122 endMargin = a.getDimensionPixelSize( 7123 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 7124 DEFAULT_MARGIN_RELATIVE); 7125 7126 if (isMarginRelative()) { 7127 mMarginFlags |= NEED_RESOLUTION_MASK; 7128 } 7129 } 7130 7131 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 7132 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 7133 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 7134 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 7135 } 7136 7137 // Layout direction is LTR by default 7138 mMarginFlags |= LAYOUT_DIRECTION_LTR; 7139 7140 a.recycle(); 7141 } 7142 7143 public MarginLayoutParams(int width, int height) { 7144 super(width, height); 7145 7146 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 7147 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 7148 7149 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7150 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 7151 } 7152 7153 /** 7154 * Copy constructor. Clones the width, height and margin values of the source. 7155 * 7156 * @param source The layout params to copy from. 7157 */ 7158 public MarginLayoutParams(MarginLayoutParams source) { 7159 this.width = source.width; 7160 this.height = source.height; 7161 7162 this.leftMargin = source.leftMargin; 7163 this.topMargin = source.topMargin; 7164 this.rightMargin = source.rightMargin; 7165 this.bottomMargin = source.bottomMargin; 7166 this.startMargin = source.startMargin; 7167 this.endMargin = source.endMargin; 7168 7169 this.mMarginFlags = source.mMarginFlags; 7170 } 7171 7172 public MarginLayoutParams(LayoutParams source) { 7173 super(source); 7174 7175 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 7176 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 7177 7178 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7179 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 7180 } 7181 7182 /** 7183 * @hide Used internally. 7184 */ 7185 public final void copyMarginsFrom(MarginLayoutParams source) { 7186 this.leftMargin = source.leftMargin; 7187 this.topMargin = source.topMargin; 7188 this.rightMargin = source.rightMargin; 7189 this.bottomMargin = source.bottomMargin; 7190 this.startMargin = source.startMargin; 7191 this.endMargin = source.endMargin; 7192 7193 this.mMarginFlags = source.mMarginFlags; 7194 } 7195 7196 /** 7197 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 7198 * to be done so that the new margins are taken into account. Left and right margins may be 7199 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 7200 * Margin values should be positive. 7201 * 7202 * @param left the left margin size 7203 * @param top the top margin size 7204 * @param right the right margin size 7205 * @param bottom the bottom margin size 7206 * 7207 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 7208 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 7209 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 7210 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 7211 */ 7212 public void setMargins(int left, int top, int right, int bottom) { 7213 leftMargin = left; 7214 topMargin = top; 7215 rightMargin = right; 7216 bottomMargin = bottom; 7217 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 7218 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 7219 if (isMarginRelative()) { 7220 mMarginFlags |= NEED_RESOLUTION_MASK; 7221 } else { 7222 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7223 } 7224 } 7225 7226 /** 7227 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 7228 * needs to be done so that the new relative margins are taken into account. Left and right 7229 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 7230 * direction. Margin values should be positive. 7231 * 7232 * @param start the start margin size 7233 * @param top the top margin size 7234 * @param end the right margin size 7235 * @param bottom the bottom margin size 7236 * 7237 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7238 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 7239 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7240 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 7241 * 7242 * @hide 7243 */ 7244 public void setMarginsRelative(int start, int top, int end, int bottom) { 7245 startMargin = start; 7246 topMargin = top; 7247 endMargin = end; 7248 bottomMargin = bottom; 7249 mMarginFlags |= NEED_RESOLUTION_MASK; 7250 } 7251 7252 /** 7253 * Sets the relative start margin. Margin values should be positive. 7254 * 7255 * @param start the start margin size 7256 * 7257 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7258 */ 7259 public void setMarginStart(int start) { 7260 startMargin = start; 7261 mMarginFlags |= NEED_RESOLUTION_MASK; 7262 } 7263 7264 /** 7265 * Returns the start margin in pixels. 7266 * 7267 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7268 * 7269 * @return the start margin in pixels. 7270 */ 7271 public int getMarginStart() { 7272 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 7273 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 7274 doResolveMargins(); 7275 } 7276 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7277 case View.LAYOUT_DIRECTION_RTL: 7278 return rightMargin; 7279 case View.LAYOUT_DIRECTION_LTR: 7280 default: 7281 return leftMargin; 7282 } 7283 } 7284 7285 /** 7286 * Sets the relative end margin. Margin values should be positive. 7287 * 7288 * @param end the end margin size 7289 * 7290 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7291 */ 7292 public void setMarginEnd(int end) { 7293 endMargin = end; 7294 mMarginFlags |= NEED_RESOLUTION_MASK; 7295 } 7296 7297 /** 7298 * Returns the end margin in pixels. 7299 * 7300 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7301 * 7302 * @return the end margin in pixels. 7303 */ 7304 public int getMarginEnd() { 7305 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 7306 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 7307 doResolveMargins(); 7308 } 7309 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7310 case View.LAYOUT_DIRECTION_RTL: 7311 return leftMargin; 7312 case View.LAYOUT_DIRECTION_LTR: 7313 default: 7314 return rightMargin; 7315 } 7316 } 7317 7318 /** 7319 * Check if margins are relative. 7320 * 7321 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7322 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7323 * 7324 * @return true if either marginStart or marginEnd has been set. 7325 */ 7326 public boolean isMarginRelative() { 7327 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 7328 } 7329 7330 /** 7331 * Set the layout direction 7332 * @param layoutDirection the layout direction. 7333 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 7334 * or {@link View#LAYOUT_DIRECTION_RTL}. 7335 */ 7336 public void setLayoutDirection(int layoutDirection) { 7337 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 7338 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 7339 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 7340 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 7341 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 7342 if (isMarginRelative()) { 7343 mMarginFlags |= NEED_RESOLUTION_MASK; 7344 } else { 7345 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7346 } 7347 } 7348 } 7349 7350 /** 7351 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 7352 * {@link View#LAYOUT_DIRECTION_RTL}. 7353 * 7354 * @return the layout direction. 7355 */ 7356 public int getLayoutDirection() { 7357 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 7358 } 7359 7360 /** 7361 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 7362 * may be overridden depending on layout direction. 7363 */ 7364 @Override 7365 public void resolveLayoutDirection(int layoutDirection) { 7366 setLayoutDirection(layoutDirection); 7367 7368 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 7369 // Will use the left and right margins if no relative margin is defined. 7370 if (!isMarginRelative() || 7371 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 7372 7373 // Proceed with resolution 7374 doResolveMargins(); 7375 } 7376 7377 private void doResolveMargins() { 7378 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 7379 // if left or right margins are not defined and if we have some start or end margin 7380 // defined then use those start and end margins. 7381 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 7382 && startMargin > DEFAULT_MARGIN_RELATIVE) { 7383 leftMargin = startMargin; 7384 } 7385 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 7386 && endMargin > DEFAULT_MARGIN_RELATIVE) { 7387 rightMargin = endMargin; 7388 } 7389 } else { 7390 // We have some relative margins (either the start one or the end one or both). So use 7391 // them and override what has been defined for left and right margins. If either start 7392 // or end margin is not defined, just set it to default "0". 7393 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7394 case View.LAYOUT_DIRECTION_RTL: 7395 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7396 endMargin : DEFAULT_MARGIN_RESOLVED; 7397 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7398 startMargin : DEFAULT_MARGIN_RESOLVED; 7399 break; 7400 case View.LAYOUT_DIRECTION_LTR: 7401 default: 7402 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7403 startMargin : DEFAULT_MARGIN_RESOLVED; 7404 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7405 endMargin : DEFAULT_MARGIN_RESOLVED; 7406 break; 7407 } 7408 } 7409 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7410 } 7411 7412 /** 7413 * @hide 7414 */ 7415 public boolean isLayoutRtl() { 7416 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 7417 } 7418 7419 /** 7420 * @hide 7421 */ 7422 @Override 7423 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 7424 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 7425 7426 fillDifference(canvas, 7427 view.getLeft() + oi.left, 7428 view.getTop() + oi.top, 7429 view.getRight() - oi.right, 7430 view.getBottom() - oi.bottom, 7431 leftMargin, 7432 topMargin, 7433 rightMargin, 7434 bottomMargin, 7435 paint); 7436 } 7437 7438 /** @hide */ 7439 @Override 7440 protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) { 7441 super.encodeProperties(encoder); 7442 encoder.addProperty("leftMargin", leftMargin); 7443 encoder.addProperty("topMargin", topMargin); 7444 encoder.addProperty("rightMargin", rightMargin); 7445 encoder.addProperty("bottomMargin", bottomMargin); 7446 encoder.addProperty("startMargin", startMargin); 7447 encoder.addProperty("endMargin", endMargin); 7448 } 7449 } 7450 7451 /* Describes a touched view and the ids of the pointers that it has captured. 7452 * 7453 * This code assumes that pointer ids are always in the range 0..31 such that 7454 * it can use a bitfield to track which pointer ids are present. 7455 * As it happens, the lower layers of the input dispatch pipeline also use the 7456 * same trick so the assumption should be safe here... 7457 */ 7458 private static final class TouchTarget { 7459 private static final int MAX_RECYCLED = 32; 7460 private static final Object sRecycleLock = new Object[0]; 7461 private static TouchTarget sRecycleBin; 7462 private static int sRecycledCount; 7463 7464 public static final int ALL_POINTER_IDS = -1; // all ones 7465 7466 // The touched child view. 7467 public View child; 7468 7469 // The combined bit mask of pointer ids for all pointers captured by the target. 7470 public int pointerIdBits; 7471 7472 // The next target in the target list. 7473 public TouchTarget next; 7474 7475 private TouchTarget() { 7476 } 7477 7478 public static TouchTarget obtain(View child, int pointerIdBits) { 7479 final TouchTarget target; 7480 synchronized (sRecycleLock) { 7481 if (sRecycleBin == null) { 7482 target = new TouchTarget(); 7483 } else { 7484 target = sRecycleBin; 7485 sRecycleBin = target.next; 7486 sRecycledCount--; 7487 target.next = null; 7488 } 7489 } 7490 target.child = child; 7491 target.pointerIdBits = pointerIdBits; 7492 return target; 7493 } 7494 7495 public void recycle() { 7496 synchronized (sRecycleLock) { 7497 if (sRecycledCount < MAX_RECYCLED) { 7498 next = sRecycleBin; 7499 sRecycleBin = this; 7500 sRecycledCount += 1; 7501 } else { 7502 next = null; 7503 } 7504 child = null; 7505 } 7506 } 7507 } 7508 7509 /* Describes a hovered view. */ 7510 private static final class HoverTarget { 7511 private static final int MAX_RECYCLED = 32; 7512 private static final Object sRecycleLock = new Object[0]; 7513 private static HoverTarget sRecycleBin; 7514 private static int sRecycledCount; 7515 7516 // The hovered child view. 7517 public View child; 7518 7519 // The next target in the target list. 7520 public HoverTarget next; 7521 7522 private HoverTarget() { 7523 } 7524 7525 public static HoverTarget obtain(View child) { 7526 final HoverTarget target; 7527 synchronized (sRecycleLock) { 7528 if (sRecycleBin == null) { 7529 target = new HoverTarget(); 7530 } else { 7531 target = sRecycleBin; 7532 sRecycleBin = target.next; 7533 sRecycledCount--; 7534 target.next = null; 7535 } 7536 } 7537 target.child = child; 7538 return target; 7539 } 7540 7541 public void recycle() { 7542 synchronized (sRecycleLock) { 7543 if (sRecycledCount < MAX_RECYCLED) { 7544 next = sRecycleBin; 7545 sRecycleBin = this; 7546 sRecycledCount += 1; 7547 } else { 7548 next = null; 7549 } 7550 child = null; 7551 } 7552 } 7553 } 7554 7555 /** 7556 * Pooled class that orderes the children of a ViewGroup from start 7557 * to end based on how they are laid out and the layout direction. 7558 */ 7559 static class ChildListForAccessibility { 7560 7561 private static final int MAX_POOL_SIZE = 32; 7562 7563 private static final SynchronizedPool<ChildListForAccessibility> sPool = 7564 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 7565 7566 private final ArrayList<View> mChildren = new ArrayList<View>(); 7567 7568 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 7569 7570 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 7571 ChildListForAccessibility list = sPool.acquire(); 7572 if (list == null) { 7573 list = new ChildListForAccessibility(); 7574 } 7575 list.init(parent, sort); 7576 return list; 7577 } 7578 7579 public void recycle() { 7580 clear(); 7581 sPool.release(this); 7582 } 7583 7584 public int getChildCount() { 7585 return mChildren.size(); 7586 } 7587 7588 public View getChildAt(int index) { 7589 return mChildren.get(index); 7590 } 7591 7592 public int getChildIndex(View child) { 7593 return mChildren.indexOf(child); 7594 } 7595 7596 private void init(ViewGroup parent, boolean sort) { 7597 ArrayList<View> children = mChildren; 7598 final int childCount = parent.getChildCount(); 7599 for (int i = 0; i < childCount; i++) { 7600 View child = parent.getChildAt(i); 7601 children.add(child); 7602 } 7603 if (sort) { 7604 ArrayList<ViewLocationHolder> holders = mHolders; 7605 for (int i = 0; i < childCount; i++) { 7606 View child = children.get(i); 7607 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 7608 holders.add(holder); 7609 } 7610 sort(holders); 7611 for (int i = 0; i < childCount; i++) { 7612 ViewLocationHolder holder = holders.get(i); 7613 children.set(i, holder.mView); 7614 holder.recycle(); 7615 } 7616 holders.clear(); 7617 } 7618 } 7619 7620 private void sort(ArrayList<ViewLocationHolder> holders) { 7621 // This is gross but the least risky solution. The current comparison 7622 // strategy breaks transitivity but produces very good results. Coming 7623 // up with a new strategy requires time which we do not have, so ... 7624 try { 7625 ViewLocationHolder.setComparisonStrategy( 7626 ViewLocationHolder.COMPARISON_STRATEGY_STRIPE); 7627 Collections.sort(holders); 7628 } catch (IllegalArgumentException iae) { 7629 // Note that in practice this occurs extremely rarely in a couple 7630 // of pathological cases. 7631 ViewLocationHolder.setComparisonStrategy( 7632 ViewLocationHolder.COMPARISON_STRATEGY_LOCATION); 7633 Collections.sort(holders); 7634 } 7635 } 7636 7637 private void clear() { 7638 mChildren.clear(); 7639 } 7640 } 7641 7642 /** 7643 * Pooled class that holds a View and its location with respect to 7644 * a specified root. This enables sorting of views based on their 7645 * coordinates without recomputing the position relative to the root 7646 * on every comparison. 7647 */ 7648 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 7649 7650 private static final int MAX_POOL_SIZE = 32; 7651 7652 private static final SynchronizedPool<ViewLocationHolder> sPool = 7653 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 7654 7655 public static final int COMPARISON_STRATEGY_STRIPE = 1; 7656 7657 public static final int COMPARISON_STRATEGY_LOCATION = 2; 7658 7659 private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE; 7660 7661 private final Rect mLocation = new Rect(); 7662 7663 public View mView; 7664 7665 private int mLayoutDirection; 7666 7667 public static ViewLocationHolder obtain(ViewGroup root, View view) { 7668 ViewLocationHolder holder = sPool.acquire(); 7669 if (holder == null) { 7670 holder = new ViewLocationHolder(); 7671 } 7672 holder.init(root, view); 7673 return holder; 7674 } 7675 7676 public static void setComparisonStrategy(int strategy) { 7677 sComparisonStrategy = strategy; 7678 } 7679 7680 public void recycle() { 7681 clear(); 7682 sPool.release(this); 7683 } 7684 7685 @Override 7686 public int compareTo(ViewLocationHolder another) { 7687 // This instance is greater than an invalid argument. 7688 if (another == null) { 7689 return 1; 7690 } 7691 7692 if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { 7693 // First is above second. 7694 if (mLocation.bottom - another.mLocation.top <= 0) { 7695 return -1; 7696 } 7697 // First is below second. 7698 if (mLocation.top - another.mLocation.bottom >= 0) { 7699 return 1; 7700 } 7701 } 7702 7703 // We are ordering left-to-right, top-to-bottom. 7704 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 7705 final int leftDifference = mLocation.left - another.mLocation.left; 7706 if (leftDifference != 0) { 7707 return leftDifference; 7708 } 7709 } else { // RTL 7710 final int rightDifference = mLocation.right - another.mLocation.right; 7711 if (rightDifference != 0) { 7712 return -rightDifference; 7713 } 7714 } 7715 // We are ordering left-to-right, top-to-bottom. 7716 final int topDifference = mLocation.top - another.mLocation.top; 7717 if (topDifference != 0) { 7718 return topDifference; 7719 } 7720 // Break tie by height. 7721 final int heightDiference = mLocation.height() - another.mLocation.height(); 7722 if (heightDiference != 0) { 7723 return -heightDiference; 7724 } 7725 // Break tie by width. 7726 final int widthDiference = mLocation.width() - another.mLocation.width(); 7727 if (widthDiference != 0) { 7728 return -widthDiference; 7729 } 7730 // Just break the tie somehow. The accessibliity ids are unique 7731 // and stable, hence this is deterministic tie breaking. 7732 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 7733 } 7734 7735 private void init(ViewGroup root, View view) { 7736 Rect viewLocation = mLocation; 7737 view.getDrawingRect(viewLocation); 7738 root.offsetDescendantRectToMyCoords(view, viewLocation); 7739 mView = view; 7740 mLayoutDirection = root.getLayoutDirection(); 7741 } 7742 7743 private void clear() { 7744 mView = null; 7745 mLocation.set(0, 0, 0, 0); 7746 } 7747 } 7748 7749 private static Paint getDebugPaint() { 7750 if (sDebugPaint == null) { 7751 sDebugPaint = new Paint(); 7752 sDebugPaint.setAntiAlias(false); 7753 } 7754 return sDebugPaint; 7755 } 7756 7757 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 7758 if (sDebugLines== null) { 7759 // TODO: This won't work with multiple UI threads in a single process 7760 sDebugLines = new float[16]; 7761 } 7762 7763 sDebugLines[0] = x1; 7764 sDebugLines[1] = y1; 7765 sDebugLines[2] = x2; 7766 sDebugLines[3] = y1; 7767 7768 sDebugLines[4] = x2; 7769 sDebugLines[5] = y1; 7770 sDebugLines[6] = x2; 7771 sDebugLines[7] = y2; 7772 7773 sDebugLines[8] = x2; 7774 sDebugLines[9] = y2; 7775 sDebugLines[10] = x1; 7776 sDebugLines[11] = y2; 7777 7778 sDebugLines[12] = x1; 7779 sDebugLines[13] = y2; 7780 sDebugLines[14] = x1; 7781 sDebugLines[15] = y1; 7782 7783 canvas.drawLines(sDebugLines, paint); 7784 } 7785 7786 /** @hide */ 7787 @Override 7788 protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) { 7789 super.encodeProperties(encoder); 7790 7791 encoder.addProperty("focus:descendantFocusability", getDescendantFocusability()); 7792 encoder.addProperty("drawing:clipChildren", getClipChildren()); 7793 encoder.addProperty("drawing:clipToPadding", getClipToPadding()); 7794 encoder.addProperty("drawing:childrenDrawingOrderEnabled", isChildrenDrawingOrderEnabled()); 7795 encoder.addProperty("drawing:persistentDrawingCache", getPersistentDrawingCache()); 7796 7797 int n = getChildCount(); 7798 encoder.addProperty("meta:__childCount__", (short)n); 7799 for (int i = 0; i < n; i++) { 7800 encoder.addPropertyKey("meta:__child__" + i); 7801 getChildAt(i).encode(encoder); 7802 } 7803 } 7804} 7805