ViewGroup.java revision b2847afde24aac22c8fb804cdce0c24b8a7c40c4
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.content.Context; 22import android.content.Intent; 23import android.content.pm.PackageManager; 24import android.content.res.Configuration; 25import android.content.res.TypedArray; 26import android.graphics.Bitmap; 27import android.graphics.Canvas; 28import android.graphics.Color; 29import android.graphics.Insets; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PointF; 33import android.graphics.Rect; 34import android.graphics.RectF; 35import android.graphics.Region; 36import android.os.Build; 37import android.os.Bundle; 38import android.os.Parcelable; 39import android.os.SystemClock; 40import android.util.AttributeSet; 41import android.util.Log; 42import android.util.Pools.SynchronizedPool; 43import android.util.SparseArray; 44import android.view.accessibility.AccessibilityEvent; 45import android.view.accessibility.AccessibilityNodeInfo; 46import android.view.animation.Animation; 47import android.view.animation.AnimationUtils; 48import android.view.animation.LayoutAnimationController; 49import android.view.animation.Transformation; 50 51import com.android.internal.R; 52import com.android.internal.util.Predicate; 53 54import java.util.ArrayList; 55import java.util.Collections; 56import java.util.HashSet; 57import java.util.List; 58import java.util.Map; 59import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 60 61/** 62 * <p> 63 * A <code>ViewGroup</code> is a special view that can contain other views 64 * (called children.) The view group is the base class for layouts and views 65 * containers. This class also defines the 66 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 67 * class for layouts parameters. 68 * </p> 69 * 70 * <p> 71 * Also see {@link LayoutParams} for layout attributes. 72 * </p> 73 * 74 * <div class="special reference"> 75 * <h3>Developer Guides</h3> 76 * <p>For more information about creating user interface layouts, read the 77 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 78 * guide.</p></div> 79 * 80 * <p>Here is a complete implementation of a custom ViewGroup that implements 81 * a simple {@link android.widget.FrameLayout} along with the ability to stack 82 * children in left and right gutters.</p> 83 * 84 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 85 * Complete} 86 * 87 * <p>If you are implementing XML layout attributes as shown in the example, this is the 88 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 89 * 90 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 91 * 92 * <p>Finally the layout manager can be used in an XML layout like so:</p> 93 * 94 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 95 * 96 * @attr ref android.R.styleable#ViewGroup_clipChildren 97 * @attr ref android.R.styleable#ViewGroup_clipToPadding 98 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 99 * @attr ref android.R.styleable#ViewGroup_animationCache 100 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 101 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 102 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 103 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 104 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 105 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 106 * @attr ref android.R.styleable#ViewGroup_layoutMode 107 */ 108public abstract class ViewGroup extends View implements ViewParent, ViewManager { 109 private static final String TAG = "ViewGroup"; 110 111 private static final boolean DBG = false; 112 /** @hide */ 113 public static boolean DEBUG_DRAW = false; 114 115 /** 116 * Views which have been hidden or removed which need to be animated on 117 * their way out. 118 * This field should be made private, so it is hidden from the SDK. 119 * {@hide} 120 */ 121 protected ArrayList<View> mDisappearingChildren; 122 123 /** 124 * Listener used to propagate events indicating when children are added 125 * and/or removed from a view group. 126 * This field should be made private, so it is hidden from the SDK. 127 * {@hide} 128 */ 129 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 130 131 // The view contained within this ViewGroup that has or contains focus. 132 private View mFocused; 133 134 /** 135 * A Transformation used when drawing children, to 136 * apply on the child being drawn. 137 */ 138 private Transformation mChildTransformation; 139 140 /** 141 * Used to track the current invalidation region. 142 */ 143 RectF mInvalidateRegion; 144 145 /** 146 * A Transformation used to calculate a correct 147 * invalidation area when the application is autoscaled. 148 */ 149 Transformation mInvalidationTransformation; 150 151 // View currently under an ongoing drag 152 private View mCurrentDragView; 153 154 // Metadata about the ongoing drag 155 private DragEvent mCurrentDrag; 156 private HashSet<View> mDragNotifiedChildren; 157 158 // Does this group have a child that can accept the current drag payload? 159 private boolean mChildAcceptsDrag; 160 161 // Used during drag dispatch 162 private PointF mLocalPoint; 163 164 // Lazily-created holder for point computations. 165 private float[] mTempPoint; 166 167 // Layout animation 168 private LayoutAnimationController mLayoutAnimationController; 169 private Animation.AnimationListener mAnimationListener; 170 171 // First touch target in the linked list of touch targets. 172 private TouchTarget mFirstTouchTarget; 173 174 // For debugging only. You can see these in hierarchyviewer. 175 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 176 @ViewDebug.ExportedProperty(category = "events") 177 private long mLastTouchDownTime; 178 @ViewDebug.ExportedProperty(category = "events") 179 private int mLastTouchDownIndex = -1; 180 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 181 @ViewDebug.ExportedProperty(category = "events") 182 private float mLastTouchDownX; 183 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 184 @ViewDebug.ExportedProperty(category = "events") 185 private float mLastTouchDownY; 186 187 // First hover target in the linked list of hover targets. 188 // The hover targets are children which have received ACTION_HOVER_ENTER. 189 // They might not have actually handled the hover event, but we will 190 // continue sending hover events to them as long as the pointer remains over 191 // their bounds and the view group does not intercept hover. 192 private HoverTarget mFirstHoverTarget; 193 194 // True if the view group itself received a hover event. 195 // It might not have actually handled the hover event. 196 private boolean mHoveredSelf; 197 198 /** 199 * Internal flags. 200 * 201 * This field should be made private, so it is hidden from the SDK. 202 * {@hide} 203 */ 204 @ViewDebug.ExportedProperty(flagMapping = { 205 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 206 name = "CLIP_CHILDREN"), 207 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 208 name = "CLIP_TO_PADDING"), 209 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 210 name = "PADDING_NOT_NULL") 211 }, formatToHexString = true) 212 protected int mGroupFlags; 213 214 /** 215 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 216 */ 217 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 218 219 /** 220 * NOTE: If you change the flags below make sure to reflect the changes 221 * the DisplayList class 222 */ 223 224 // When set, ViewGroup invalidates only the child's rectangle 225 // Set by default 226 static final int FLAG_CLIP_CHILDREN = 0x1; 227 228 // When set, ViewGroup excludes the padding area from the invalidate rectangle 229 // Set by default 230 private static final int FLAG_CLIP_TO_PADDING = 0x2; 231 232 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 233 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 234 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 235 236 // When set, dispatchDraw() will run the layout animation and unset the flag 237 private static final int FLAG_RUN_ANIMATION = 0x8; 238 239 // When set, there is either no layout animation on the ViewGroup or the layout 240 // animation is over 241 // Set by default 242 static final int FLAG_ANIMATION_DONE = 0x10; 243 244 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 245 // to clip it, even if FLAG_CLIP_TO_PADDING is set 246 private static final int FLAG_PADDING_NOT_NULL = 0x20; 247 248 /** @deprecated - functionality removed */ 249 private static final int FLAG_ANIMATION_CACHE = 0x40; 250 251 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 252 // layout animation; this avoid clobbering the hierarchy 253 // Automatically set when the layout animation starts, depending on the animation's 254 // characteristics 255 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 256 257 // When set, the next call to drawChild() will clear mChildTransformation's matrix 258 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 259 260 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 261 // the children's Bitmap caches if necessary 262 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 263 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 264 265 /** 266 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 267 * to get the index of the child to draw for that iteration. 268 * 269 * @hide 270 */ 271 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 272 273 /** 274 * When set, this ViewGroup supports static transformations on children; this causes 275 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 276 * invoked when a child is drawn. 277 * 278 * Any subclass overriding 279 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 280 * set this flags in {@link #mGroupFlags}. 281 * 282 * {@hide} 283 */ 284 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 285 286 // UNUSED FLAG VALUE: 0x1000; 287 288 /** 289 * When set, this ViewGroup's drawable states also include those 290 * of its children. 291 */ 292 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 293 294 /** @deprecated functionality removed */ 295 private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 296 297 /** @deprecated functionality removed */ 298 private static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 299 300 /** 301 * When set, this group will go through its list of children to notify them of 302 * any drawable state change. 303 */ 304 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 305 306 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 307 308 /** 309 * This view will get focus before any of its descendants. 310 */ 311 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 312 313 /** 314 * This view will get focus only if none of its descendants want it. 315 */ 316 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 317 318 /** 319 * This view will block any of its descendants from getting focus, even 320 * if they are focusable. 321 */ 322 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 323 324 /** 325 * Used to map between enum in attrubutes and flag values. 326 */ 327 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 328 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 329 FOCUS_BLOCK_DESCENDANTS}; 330 331 /** 332 * When set, this ViewGroup should not intercept touch events. 333 * {@hide} 334 */ 335 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 336 337 /** 338 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 339 */ 340 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 341 342 /** 343 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 344 * to children when adding new views. This is used to prevent multiple 345 * onAttached calls when a ViewGroup adds children in its own onAttached method. 346 */ 347 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 348 349 /** 350 * When true, indicates that a layoutMode has been explicitly set, either with 351 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 352 * This distinguishes the situation in which a layout mode was inherited from 353 * one of the ViewGroup's ancestors and cached locally. 354 */ 355 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 356 357 static final int FLAG_IS_TRANSITION_GROUP = 0x1000000; 358 359 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000; 360 361 /** 362 * When set, focus will not be permitted to enter this group if a touchscreen is present. 363 */ 364 static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000; 365 366 /** 367 * When true, indicates that a call to startActionModeForChild was made with the type parameter 368 * and should not be ignored. This helps in backwards compatibility with the existing method 369 * without a type. 370 * 371 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 372 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 373 */ 374 private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED = 0x8000000; 375 376 /** 377 * When true, indicates that a call to startActionModeForChild was made without the type 378 * parameter. This helps in backwards compatibility with the existing method 379 * without a type. 380 * 381 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 382 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 383 */ 384 private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED = 0x10000000; 385 386 /** 387 * Indicates which types of drawing caches are to be kept in memory. 388 * This field should be made private, so it is hidden from the SDK. 389 * {@hide} 390 */ 391 protected int mPersistentDrawingCache; 392 393 /** 394 * Used to indicate that no drawing cache should be kept in memory. 395 */ 396 public static final int PERSISTENT_NO_CACHE = 0x0; 397 398 /** 399 * Used to indicate that the animation drawing cache should be kept in memory. 400 */ 401 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 402 403 /** 404 * Used to indicate that the scrolling drawing cache should be kept in memory. 405 */ 406 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 407 408 /** 409 * Used to indicate that all drawing caches should be kept in memory. 410 */ 411 public static final int PERSISTENT_ALL_CACHES = 0x3; 412 413 // Layout Modes 414 415 private static final int LAYOUT_MODE_UNDEFINED = -1; 416 417 /** 418 * This constant is a {@link #setLayoutMode(int) layoutMode}. 419 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 420 * {@link #getRight() right} and {@link #getBottom() bottom}. 421 */ 422 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 423 424 /** 425 * This constant is a {@link #setLayoutMode(int) layoutMode}. 426 * Optical bounds describe where a widget appears to be. They sit inside the clip 427 * bounds which need to cover a larger area to allow other effects, 428 * such as shadows and glows, to be drawn. 429 */ 430 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 431 432 /** @hide */ 433 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 434 435 /** 436 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 437 * are set at the same time. 438 */ 439 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 440 441 // Index of the child's left position in the mLocation array 442 private static final int CHILD_LEFT_INDEX = 0; 443 // Index of the child's top position in the mLocation array 444 private static final int CHILD_TOP_INDEX = 1; 445 446 // Child views of this ViewGroup 447 private View[] mChildren; 448 // Number of valid children in the mChildren array, the rest should be null or not 449 // considered as children 450 private int mChildrenCount; 451 452 // Whether layout calls are currently being suppressed, controlled by calls to 453 // suppressLayout() 454 boolean mSuppressLayout = false; 455 456 // Whether any layout calls have actually been suppressed while mSuppressLayout 457 // has been true. This tracks whether we need to issue a requestLayout() when 458 // layout is later re-enabled. 459 private boolean mLayoutCalledWhileSuppressed = false; 460 461 private static final int ARRAY_INITIAL_CAPACITY = 12; 462 private static final int ARRAY_CAPACITY_INCREMENT = 12; 463 464 private static Paint sDebugPaint; 465 private static float[] sDebugLines; 466 467 // Used to draw cached views 468 Paint mCachePaint; 469 470 // Used to animate add/remove changes in layout 471 private LayoutTransition mTransition; 472 473 // The set of views that are currently being transitioned. This list is used to track views 474 // being removed that should not actually be removed from the parent yet because they are 475 // being animated. 476 private ArrayList<View> mTransitioningViews; 477 478 // List of children changing visibility. This is used to potentially keep rendering 479 // views during a transition when they otherwise would have become gone/invisible 480 private ArrayList<View> mVisibilityChangingChildren; 481 482 // Temporary holder of presorted children, only used for 483 // input/software draw dispatch for correctly Z ordering. 484 private ArrayList<View> mPreSortedChildren; 485 486 // Indicates how many of this container's child subtrees contain transient state 487 @ViewDebug.ExportedProperty(category = "layout") 488 private int mChildCountWithTransientState = 0; 489 490 /** 491 * Currently registered axes for nested scrolling. Flag set consisting of 492 * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE} 493 * for null. 494 */ 495 private int mNestedScrollAxes; 496 497 // Used to manage the list of transient views, added by addTransientView() 498 private List<Integer> mTransientIndices = null; 499 private List<View> mTransientViews = null; 500 501 502 /** 503 * Empty ActionMode used as a sentinel in recursive entries to startActionModeForChild. 504 * 505 * @see #startActionModeForChild(View, android.view.ActionMode.Callback) 506 * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 507 */ 508 private static final ActionMode SENTINEL_ACTION_MODE = new ActionMode() { 509 @Override 510 public void setTitle(CharSequence title) {} 511 512 @Override 513 public void setTitle(int resId) {} 514 515 @Override 516 public void setSubtitle(CharSequence subtitle) {} 517 518 @Override 519 public void setSubtitle(int resId) {} 520 521 @Override 522 public void setCustomView(View view) {} 523 524 @Override 525 public void invalidate() {} 526 527 @Override 528 public void finish() {} 529 530 @Override 531 public Menu getMenu() { 532 return null; 533 } 534 535 @Override 536 public CharSequence getTitle() { 537 return null; 538 } 539 540 @Override 541 public CharSequence getSubtitle() { 542 return null; 543 } 544 545 @Override 546 public View getCustomView() { 547 return null; 548 } 549 550 @Override 551 public MenuInflater getMenuInflater() { 552 return null; 553 } 554 }; 555 556 public ViewGroup(Context context) { 557 this(context, null); 558 } 559 560 public ViewGroup(Context context, AttributeSet attrs) { 561 this(context, attrs, 0); 562 } 563 564 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 565 this(context, attrs, defStyleAttr, 0); 566 } 567 568 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 569 super(context, attrs, defStyleAttr, defStyleRes); 570 initViewGroup(); 571 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 572 } 573 574 private boolean debugDraw() { 575 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 576 } 577 578 private void initViewGroup() { 579 // ViewGroup doesn't draw by default 580 if (!debugDraw()) { 581 setFlags(WILL_NOT_DRAW, DRAW_MASK); 582 } 583 mGroupFlags |= FLAG_CLIP_CHILDREN; 584 mGroupFlags |= FLAG_CLIP_TO_PADDING; 585 mGroupFlags |= FLAG_ANIMATION_DONE; 586 587 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 588 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 589 } 590 591 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 592 593 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 594 mChildrenCount = 0; 595 596 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 597 } 598 599 private void initFromAttributes( 600 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 601 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr, 602 defStyleRes); 603 604 final int N = a.getIndexCount(); 605 for (int i = 0; i < N; i++) { 606 int attr = a.getIndex(i); 607 switch (attr) { 608 case R.styleable.ViewGroup_clipChildren: 609 setClipChildren(a.getBoolean(attr, true)); 610 break; 611 case R.styleable.ViewGroup_clipToPadding: 612 setClipToPadding(a.getBoolean(attr, true)); 613 break; 614 case R.styleable.ViewGroup_animationCache: 615 setAnimationCacheEnabled(a.getBoolean(attr, true)); 616 break; 617 case R.styleable.ViewGroup_persistentDrawingCache: 618 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 619 break; 620 case R.styleable.ViewGroup_addStatesFromChildren: 621 setAddStatesFromChildren(a.getBoolean(attr, false)); 622 break; 623 case R.styleable.ViewGroup_alwaysDrawnWithCache: 624 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 625 break; 626 case R.styleable.ViewGroup_layoutAnimation: 627 int id = a.getResourceId(attr, -1); 628 if (id > 0) { 629 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 630 } 631 break; 632 case R.styleable.ViewGroup_descendantFocusability: 633 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 634 break; 635 case R.styleable.ViewGroup_splitMotionEvents: 636 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 637 break; 638 case R.styleable.ViewGroup_animateLayoutChanges: 639 boolean animateLayoutChanges = a.getBoolean(attr, false); 640 if (animateLayoutChanges) { 641 setLayoutTransition(new LayoutTransition()); 642 } 643 break; 644 case R.styleable.ViewGroup_layoutMode: 645 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 646 break; 647 case R.styleable.ViewGroup_transitionGroup: 648 setTransitionGroup(a.getBoolean(attr, false)); 649 break; 650 case R.styleable.ViewGroup_touchscreenBlocksFocus: 651 setTouchscreenBlocksFocus(a.getBoolean(attr, false)); 652 break; 653 } 654 } 655 656 a.recycle(); 657 } 658 659 /** 660 * Gets the descendant focusability of this view group. The descendant 661 * focusability defines the relationship between this view group and its 662 * descendants when looking for a view to take focus in 663 * {@link #requestFocus(int, android.graphics.Rect)}. 664 * 665 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 666 * {@link #FOCUS_BLOCK_DESCENDANTS}. 667 */ 668 @ViewDebug.ExportedProperty(category = "focus", mapping = { 669 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 670 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 671 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 672 }) 673 public int getDescendantFocusability() { 674 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 675 } 676 677 /** 678 * Set the descendant focusability of this view group. This defines the relationship 679 * between this view group and its descendants when looking for a view to 680 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 681 * 682 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 683 * {@link #FOCUS_BLOCK_DESCENDANTS}. 684 */ 685 public void setDescendantFocusability(int focusability) { 686 switch (focusability) { 687 case FOCUS_BEFORE_DESCENDANTS: 688 case FOCUS_AFTER_DESCENDANTS: 689 case FOCUS_BLOCK_DESCENDANTS: 690 break; 691 default: 692 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 693 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 694 } 695 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 696 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 697 } 698 699 /** 700 * {@inheritDoc} 701 */ 702 @Override 703 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 704 if (mFocused != null) { 705 mFocused.unFocus(this); 706 mFocused = null; 707 } 708 super.handleFocusGainInternal(direction, previouslyFocusedRect); 709 } 710 711 /** 712 * {@inheritDoc} 713 */ 714 public void requestChildFocus(View child, View focused) { 715 if (DBG) { 716 System.out.println(this + " requestChildFocus()"); 717 } 718 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 719 return; 720 } 721 722 // Unfocus us, if necessary 723 super.unFocus(focused); 724 725 // We had a previous notion of who had focus. Clear it. 726 if (mFocused != child) { 727 if (mFocused != null) { 728 mFocused.unFocus(focused); 729 } 730 731 mFocused = child; 732 } 733 if (mParent != null) { 734 mParent.requestChildFocus(this, focused); 735 } 736 } 737 738 /** 739 * {@inheritDoc} 740 */ 741 public void focusableViewAvailable(View v) { 742 if (mParent != null 743 // shortcut: don't report a new focusable view if we block our descendants from 744 // getting focus 745 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 746 && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen()) 747 // shortcut: don't report a new focusable view if we already are focused 748 // (and we don't prefer our descendants) 749 // 750 // note: knowing that mFocused is non-null is not a good enough reason 751 // to break the traversal since in that case we'd actually have to find 752 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 753 // an ancestor of v; this will get checked for at ViewAncestor 754 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 755 mParent.focusableViewAvailable(v); 756 } 757 } 758 759 /** 760 * {@inheritDoc} 761 */ 762 public boolean showContextMenuForChild(View originalView) { 763 return mParent != null && mParent.showContextMenuForChild(originalView); 764 } 765 766 /** 767 * {@inheritDoc} 768 */ 769 @Override 770 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 771 if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED) == 0) { 772 // This is the original call. 773 try { 774 mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED; 775 return startActionModeForChild(originalView, callback, ActionMode.TYPE_PRIMARY); 776 } finally { 777 mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED; 778 } 779 } else { 780 // We are being called from the new method with type. 781 return SENTINEL_ACTION_MODE; 782 } 783 } 784 785 /** 786 * {@inheritDoc} 787 */ 788 @Override 789 public ActionMode startActionModeForChild( 790 View originalView, ActionMode.Callback callback, int type) { 791 if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED) == 0) { 792 ActionMode mode; 793 try { 794 mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED; 795 mode = startActionModeForChild(originalView, callback); 796 } finally { 797 mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED; 798 } 799 if (mode != SENTINEL_ACTION_MODE) { 800 return mode; 801 } 802 } 803 if (mParent != null) { 804 try { 805 return mParent.startActionModeForChild(originalView, callback, type); 806 } catch (AbstractMethodError ame) { 807 // Custom view parents might not implement this method. 808 return mParent.startActionModeForChild(originalView, callback); 809 } 810 } 811 return null; 812 } 813 814 /** 815 * @hide 816 */ 817 @Override 818 public boolean dispatchActivityResult( 819 String who, int requestCode, int resultCode, Intent data) { 820 if (super.dispatchActivityResult(who, requestCode, resultCode, data)) { 821 return true; 822 } 823 int childCount = getChildCount(); 824 for (int i = 0; i < childCount; i++) { 825 View child = getChildAt(i); 826 if (child.dispatchActivityResult(who, requestCode, resultCode, data)) { 827 return true; 828 } 829 } 830 return false; 831 } 832 833 /** 834 * Find the nearest view in the specified direction that wants to take 835 * focus. 836 * 837 * @param focused The view that currently has focus 838 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 839 * FOCUS_RIGHT, or 0 for not applicable. 840 */ 841 public View focusSearch(View focused, int direction) { 842 if (isRootNamespace()) { 843 // root namespace means we should consider ourselves the top of the 844 // tree for focus searching; otherwise we could be focus searching 845 // into other tabs. see LocalActivityManager and TabHost for more info 846 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 847 } else if (mParent != null) { 848 return mParent.focusSearch(focused, direction); 849 } 850 return null; 851 } 852 853 /** 854 * {@inheritDoc} 855 */ 856 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 857 return false; 858 } 859 860 /** 861 * {@inheritDoc} 862 */ 863 @Override 864 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 865 ViewParent parent = mParent; 866 if (parent == null) { 867 return false; 868 } 869 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 870 if (!propagate) { 871 return false; 872 } 873 return parent.requestSendAccessibilityEvent(this, event); 874 } 875 876 /** 877 * Called when a child has requested sending an {@link AccessibilityEvent} and 878 * gives an opportunity to its parent to augment the event. 879 * <p> 880 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 881 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 882 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 883 * is responsible for handling this call. 884 * </p> 885 * 886 * @param child The child which requests sending the event. 887 * @param event The event to be sent. 888 * @return True if the event should be sent. 889 * 890 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 891 */ 892 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 893 if (mAccessibilityDelegate != null) { 894 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 895 } else { 896 return onRequestSendAccessibilityEventInternal(child, event); 897 } 898 } 899 900 /** 901 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 902 * 903 * Note: Called from the default {@link View.AccessibilityDelegate}. 904 * 905 * @hide 906 */ 907 public boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 908 return true; 909 } 910 911 /** 912 * Called when a child view has changed whether or not it is tracking transient state. 913 */ 914 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 915 final boolean oldHasTransientState = hasTransientState(); 916 if (childHasTransientState) { 917 mChildCountWithTransientState++; 918 } else { 919 mChildCountWithTransientState--; 920 } 921 922 final boolean newHasTransientState = hasTransientState(); 923 if (mParent != null && oldHasTransientState != newHasTransientState) { 924 try { 925 mParent.childHasTransientStateChanged(this, newHasTransientState); 926 } catch (AbstractMethodError e) { 927 Log.e(TAG, mParent.getClass().getSimpleName() + 928 " does not fully implement ViewParent", e); 929 } 930 } 931 } 932 933 @Override 934 public boolean hasTransientState() { 935 return mChildCountWithTransientState > 0 || super.hasTransientState(); 936 } 937 938 /** 939 * {@inheritDoc} 940 */ 941 @Override 942 public boolean dispatchUnhandledMove(View focused, int direction) { 943 return mFocused != null && 944 mFocused.dispatchUnhandledMove(focused, direction); 945 } 946 947 /** 948 * {@inheritDoc} 949 */ 950 public void clearChildFocus(View child) { 951 if (DBG) { 952 System.out.println(this + " clearChildFocus()"); 953 } 954 955 mFocused = null; 956 if (mParent != null) { 957 mParent.clearChildFocus(this); 958 } 959 } 960 961 /** 962 * {@inheritDoc} 963 */ 964 @Override 965 public void clearFocus() { 966 if (DBG) { 967 System.out.println(this + " clearFocus()"); 968 } 969 if (mFocused == null) { 970 super.clearFocus(); 971 } else { 972 View focused = mFocused; 973 mFocused = null; 974 focused.clearFocus(); 975 } 976 } 977 978 /** 979 * {@inheritDoc} 980 */ 981 @Override 982 void unFocus(View focused) { 983 if (DBG) { 984 System.out.println(this + " unFocus()"); 985 } 986 if (mFocused == null) { 987 super.unFocus(focused); 988 } else { 989 mFocused.unFocus(focused); 990 mFocused = null; 991 } 992 } 993 994 /** 995 * Returns the focused child of this view, if any. The child may have focus 996 * or contain focus. 997 * 998 * @return the focused child or null. 999 */ 1000 public View getFocusedChild() { 1001 return mFocused; 1002 } 1003 1004 View getDeepestFocusedChild() { 1005 View v = this; 1006 while (v != null) { 1007 if (v.isFocused()) { 1008 return v; 1009 } 1010 v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null; 1011 } 1012 return null; 1013 } 1014 1015 /** 1016 * Returns true if this view has or contains focus 1017 * 1018 * @return true if this view has or contains focus 1019 */ 1020 @Override 1021 public boolean hasFocus() { 1022 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 1023 } 1024 1025 /* 1026 * (non-Javadoc) 1027 * 1028 * @see android.view.View#findFocus() 1029 */ 1030 @Override 1031 public View findFocus() { 1032 if (DBG) { 1033 System.out.println("Find focus in " + this + ": flags=" 1034 + isFocused() + ", child=" + mFocused); 1035 } 1036 1037 if (isFocused()) { 1038 return this; 1039 } 1040 1041 if (mFocused != null) { 1042 return mFocused.findFocus(); 1043 } 1044 return null; 1045 } 1046 1047 /** 1048 * {@inheritDoc} 1049 */ 1050 @Override 1051 public boolean hasFocusable() { 1052 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 1053 return false; 1054 } 1055 1056 if (isFocusable()) { 1057 return true; 1058 } 1059 1060 final int descendantFocusability = getDescendantFocusability(); 1061 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1062 final int count = mChildrenCount; 1063 final View[] children = mChildren; 1064 1065 for (int i = 0; i < count; i++) { 1066 final View child = children[i]; 1067 if (child.hasFocusable()) { 1068 return true; 1069 } 1070 } 1071 } 1072 1073 return false; 1074 } 1075 1076 /** 1077 * {@inheritDoc} 1078 */ 1079 @Override 1080 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 1081 final int focusableCount = views.size(); 1082 1083 final int descendantFocusability = getDescendantFocusability(); 1084 1085 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1086 if (shouldBlockFocusForTouchscreen()) { 1087 focusableMode |= FOCUSABLES_TOUCH_MODE; 1088 } 1089 1090 final int count = mChildrenCount; 1091 final View[] children = mChildren; 1092 1093 for (int i = 0; i < count; i++) { 1094 final View child = children[i]; 1095 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1096 child.addFocusables(views, direction, focusableMode); 1097 } 1098 } 1099 } 1100 1101 // we add ourselves (if focusable) in all cases except for when we are 1102 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 1103 // to avoid the focus search finding layouts when a more precise search 1104 // among the focusable children would be more interesting. 1105 if ((descendantFocusability != FOCUS_AFTER_DESCENDANTS 1106 // No focusable descendants 1107 || (focusableCount == views.size())) && 1108 (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())) { 1109 super.addFocusables(views, direction, focusableMode); 1110 } 1111 } 1112 1113 /** 1114 * Set whether this ViewGroup should ignore focus requests for itself and its children. 1115 * If this option is enabled and the ViewGroup or a descendant currently has focus, focus 1116 * will proceed forward. 1117 * 1118 * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen 1119 */ 1120 public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) { 1121 if (touchscreenBlocksFocus) { 1122 mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1123 if (hasFocus()) { 1124 final View focusedChild = getDeepestFocusedChild(); 1125 if (!focusedChild.isFocusableInTouchMode()) { 1126 final View newFocus = focusSearch(FOCUS_FORWARD); 1127 if (newFocus != null) { 1128 newFocus.requestFocus(); 1129 } 1130 } 1131 } 1132 } else { 1133 mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1134 } 1135 } 1136 1137 /** 1138 * Check whether this ViewGroup should ignore focus requests for itself and its children. 1139 */ 1140 public boolean getTouchscreenBlocksFocus() { 1141 return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0; 1142 } 1143 1144 boolean shouldBlockFocusForTouchscreen() { 1145 return getTouchscreenBlocksFocus() && 1146 mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN); 1147 } 1148 1149 @Override 1150 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 1151 super.findViewsWithText(outViews, text, flags); 1152 final int childrenCount = mChildrenCount; 1153 final View[] children = mChildren; 1154 for (int i = 0; i < childrenCount; i++) { 1155 View child = children[i]; 1156 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1157 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 1158 child.findViewsWithText(outViews, text, flags); 1159 } 1160 } 1161 } 1162 1163 /** @hide */ 1164 @Override 1165 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1166 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 1167 if (foundView != null) { 1168 return foundView; 1169 } 1170 final int childrenCount = mChildrenCount; 1171 final View[] children = mChildren; 1172 for (int i = 0; i < childrenCount; i++) { 1173 View child = children[i]; 1174 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 1175 if (foundView != null) { 1176 return foundView; 1177 } 1178 } 1179 return null; 1180 } 1181 1182 /** 1183 * {@inheritDoc} 1184 */ 1185 @Override 1186 public void dispatchWindowFocusChanged(boolean hasFocus) { 1187 super.dispatchWindowFocusChanged(hasFocus); 1188 final int count = mChildrenCount; 1189 final View[] children = mChildren; 1190 for (int i = 0; i < count; i++) { 1191 children[i].dispatchWindowFocusChanged(hasFocus); 1192 } 1193 } 1194 1195 /** 1196 * {@inheritDoc} 1197 */ 1198 @Override 1199 public void addTouchables(ArrayList<View> views) { 1200 super.addTouchables(views); 1201 1202 final int count = mChildrenCount; 1203 final View[] children = mChildren; 1204 1205 for (int i = 0; i < count; i++) { 1206 final View child = children[i]; 1207 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1208 child.addTouchables(views); 1209 } 1210 } 1211 } 1212 1213 /** 1214 * @hide 1215 */ 1216 @Override 1217 public void makeOptionalFitsSystemWindows() { 1218 super.makeOptionalFitsSystemWindows(); 1219 final int count = mChildrenCount; 1220 final View[] children = mChildren; 1221 for (int i = 0; i < count; i++) { 1222 children[i].makeOptionalFitsSystemWindows(); 1223 } 1224 } 1225 1226 /** 1227 * {@inheritDoc} 1228 */ 1229 @Override 1230 public void dispatchDisplayHint(int hint) { 1231 super.dispatchDisplayHint(hint); 1232 final int count = mChildrenCount; 1233 final View[] children = mChildren; 1234 for (int i = 0; i < count; i++) { 1235 children[i].dispatchDisplayHint(hint); 1236 } 1237 } 1238 1239 /** 1240 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1241 * action. 1242 * 1243 * @param child The view whose visibility has changed 1244 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1245 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1246 * @hide 1247 */ 1248 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1249 if (mTransition != null) { 1250 if (newVisibility == VISIBLE) { 1251 mTransition.showChild(this, child, oldVisibility); 1252 } else { 1253 mTransition.hideChild(this, child, newVisibility); 1254 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1255 // Only track this on disappearing views - appearing views are already visible 1256 // and don't need special handling during drawChild() 1257 if (mVisibilityChangingChildren == null) { 1258 mVisibilityChangingChildren = new ArrayList<View>(); 1259 } 1260 mVisibilityChangingChildren.add(child); 1261 addDisappearingView(child); 1262 } 1263 } 1264 } 1265 1266 // in all cases, for drags 1267 if (mCurrentDrag != null) { 1268 if (newVisibility == VISIBLE) { 1269 notifyChildOfDrag(child); 1270 } 1271 } 1272 } 1273 1274 /** 1275 * {@inheritDoc} 1276 */ 1277 @Override 1278 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1279 super.dispatchVisibilityChanged(changedView, visibility); 1280 final int count = mChildrenCount; 1281 final View[] children = mChildren; 1282 for (int i = 0; i < count; i++) { 1283 children[i].dispatchVisibilityChanged(changedView, visibility); 1284 } 1285 } 1286 1287 /** 1288 * {@inheritDoc} 1289 */ 1290 @Override 1291 public void dispatchWindowVisibilityChanged(int visibility) { 1292 super.dispatchWindowVisibilityChanged(visibility); 1293 final int count = mChildrenCount; 1294 final View[] children = mChildren; 1295 for (int i = 0; i < count; i++) { 1296 children[i].dispatchWindowVisibilityChanged(visibility); 1297 } 1298 } 1299 1300 /** 1301 * {@inheritDoc} 1302 */ 1303 @Override 1304 public void dispatchConfigurationChanged(Configuration newConfig) { 1305 super.dispatchConfigurationChanged(newConfig); 1306 final int count = mChildrenCount; 1307 final View[] children = mChildren; 1308 for (int i = 0; i < count; i++) { 1309 children[i].dispatchConfigurationChanged(newConfig); 1310 } 1311 } 1312 1313 /** 1314 * {@inheritDoc} 1315 */ 1316 public void recomputeViewAttributes(View child) { 1317 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1318 ViewParent parent = mParent; 1319 if (parent != null) parent.recomputeViewAttributes(this); 1320 } 1321 } 1322 1323 @Override 1324 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1325 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1326 super.dispatchCollectViewAttributes(attachInfo, visibility); 1327 final int count = mChildrenCount; 1328 final View[] children = mChildren; 1329 for (int i = 0; i < count; i++) { 1330 final View child = children[i]; 1331 child.dispatchCollectViewAttributes(attachInfo, 1332 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1333 } 1334 } 1335 } 1336 1337 /** 1338 * {@inheritDoc} 1339 */ 1340 public void bringChildToFront(View child) { 1341 final int index = indexOfChild(child); 1342 if (index >= 0) { 1343 removeFromArray(index); 1344 addInArray(child, mChildrenCount); 1345 child.mParent = this; 1346 requestLayout(); 1347 invalidate(); 1348 } 1349 } 1350 1351 private PointF getLocalPoint() { 1352 if (mLocalPoint == null) mLocalPoint = new PointF(); 1353 return mLocalPoint; 1354 } 1355 1356 /** 1357 * {@inheritDoc} 1358 */ 1359 // TODO: Write real docs 1360 @Override 1361 public boolean dispatchDragEvent(DragEvent event) { 1362 boolean retval = false; 1363 final float tx = event.mX; 1364 final float ty = event.mY; 1365 1366 ViewRootImpl root = getViewRootImpl(); 1367 1368 // Dispatch down the view hierarchy 1369 final PointF localPoint = getLocalPoint(); 1370 1371 switch (event.mAction) { 1372 case DragEvent.ACTION_DRAG_STARTED: { 1373 // clear state to recalculate which views we drag over 1374 mCurrentDragView = null; 1375 1376 // Set up our tracking of drag-started notifications 1377 mCurrentDrag = DragEvent.obtain(event); 1378 if (mDragNotifiedChildren == null) { 1379 mDragNotifiedChildren = new HashSet<View>(); 1380 } else { 1381 mDragNotifiedChildren.clear(); 1382 } 1383 1384 // Now dispatch down to our children, caching the responses 1385 mChildAcceptsDrag = false; 1386 final int count = mChildrenCount; 1387 final View[] children = mChildren; 1388 for (int i = 0; i < count; i++) { 1389 final View child = children[i]; 1390 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1391 if (child.getVisibility() == VISIBLE) { 1392 final boolean handled = notifyChildOfDrag(children[i]); 1393 if (handled) { 1394 mChildAcceptsDrag = true; 1395 } 1396 } 1397 } 1398 1399 // Return HANDLED if one of our children can accept the drag 1400 if (mChildAcceptsDrag) { 1401 retval = true; 1402 } 1403 } break; 1404 1405 case DragEvent.ACTION_DRAG_ENDED: { 1406 // Release the bookkeeping now that the drag lifecycle has ended 1407 if (mDragNotifiedChildren != null) { 1408 for (View child : mDragNotifiedChildren) { 1409 // If a child was notified about an ongoing drag, it's told that it's over 1410 child.dispatchDragEvent(event); 1411 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1412 child.refreshDrawableState(); 1413 } 1414 1415 mDragNotifiedChildren.clear(); 1416 if (mCurrentDrag != null) { 1417 mCurrentDrag.recycle(); 1418 mCurrentDrag = null; 1419 } 1420 } 1421 1422 // We consider drag-ended to have been handled if one of our children 1423 // had offered to handle the drag. 1424 if (mChildAcceptsDrag) { 1425 retval = true; 1426 } 1427 } break; 1428 1429 case DragEvent.ACTION_DRAG_LOCATION: { 1430 // Find the [possibly new] drag target 1431 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1432 1433 // If we've changed apparent drag target, tell the view root which view 1434 // we're over now [for purposes of the eventual drag-recipient-changed 1435 // notifications to the framework] and tell the new target that the drag 1436 // has entered its bounds. The root will see setDragFocus() calls all 1437 // the way down to the final leaf view that is handling the LOCATION event 1438 // before reporting the new potential recipient to the framework. 1439 if (mCurrentDragView != target) { 1440 root.setDragFocus(target); 1441 1442 final int action = event.mAction; 1443 // If we've dragged off of a child view, send it the EXITED message 1444 if (mCurrentDragView != null) { 1445 final View view = mCurrentDragView; 1446 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1447 view.dispatchDragEvent(event); 1448 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1449 view.refreshDrawableState(); 1450 } 1451 mCurrentDragView = target; 1452 1453 // If we've dragged over a new child view, send it the ENTERED message 1454 if (target != null) { 1455 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1456 target.dispatchDragEvent(event); 1457 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1458 target.refreshDrawableState(); 1459 } 1460 event.mAction = action; // restore the event's original state 1461 } 1462 1463 // Dispatch the actual drag location notice, localized into its coordinates 1464 if (target != null) { 1465 event.mX = localPoint.x; 1466 event.mY = localPoint.y; 1467 1468 retval = target.dispatchDragEvent(event); 1469 1470 event.mX = tx; 1471 event.mY = ty; 1472 } 1473 } break; 1474 1475 /* Entered / exited dispatch 1476 * 1477 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1478 * that we're about to get the corresponding LOCATION event, which we will use to 1479 * determine which of our children is the new target; at that point we will 1480 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1481 * 1482 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1483 * drag has left this ViewGroup, we know by definition that every contained subview 1484 * is also no longer under the drag point. 1485 */ 1486 1487 case DragEvent.ACTION_DRAG_EXITED: { 1488 if (mCurrentDragView != null) { 1489 final View view = mCurrentDragView; 1490 view.dispatchDragEvent(event); 1491 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1492 view.refreshDrawableState(); 1493 1494 mCurrentDragView = null; 1495 } 1496 } break; 1497 1498 case DragEvent.ACTION_DROP: { 1499 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1500 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1501 if (target != null) { 1502 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1503 event.mX = localPoint.x; 1504 event.mY = localPoint.y; 1505 retval = target.dispatchDragEvent(event); 1506 event.mX = tx; 1507 event.mY = ty; 1508 } else { 1509 if (ViewDebug.DEBUG_DRAG) { 1510 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1511 } 1512 } 1513 } break; 1514 } 1515 1516 // If none of our children could handle the event, try here 1517 if (!retval) { 1518 // Call up to the View implementation that dispatches to installed listeners 1519 retval = super.dispatchDragEvent(event); 1520 } 1521 return retval; 1522 } 1523 1524 // Find the frontmost child view that lies under the given point, and calculate 1525 // the position within its own local coordinate system. 1526 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1527 final int count = mChildrenCount; 1528 final View[] children = mChildren; 1529 for (int i = count - 1; i >= 0; i--) { 1530 final View child = children[i]; 1531 if (!child.canAcceptDrag()) { 1532 continue; 1533 } 1534 1535 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1536 return child; 1537 } 1538 } 1539 return null; 1540 } 1541 1542 boolean notifyChildOfDrag(View child) { 1543 if (ViewDebug.DEBUG_DRAG) { 1544 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1545 } 1546 1547 boolean canAccept = false; 1548 if (! mDragNotifiedChildren.contains(child)) { 1549 mDragNotifiedChildren.add(child); 1550 canAccept = child.dispatchDragEvent(mCurrentDrag); 1551 if (canAccept && !child.canAcceptDrag()) { 1552 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1553 child.refreshDrawableState(); 1554 } 1555 } 1556 return canAccept; 1557 } 1558 1559 @Override 1560 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1561 super.dispatchWindowSystemUiVisiblityChanged(visible); 1562 1563 final int count = mChildrenCount; 1564 final View[] children = mChildren; 1565 for (int i=0; i <count; i++) { 1566 final View child = children[i]; 1567 child.dispatchWindowSystemUiVisiblityChanged(visible); 1568 } 1569 } 1570 1571 @Override 1572 public void dispatchSystemUiVisibilityChanged(int visible) { 1573 super.dispatchSystemUiVisibilityChanged(visible); 1574 1575 final int count = mChildrenCount; 1576 final View[] children = mChildren; 1577 for (int i=0; i <count; i++) { 1578 final View child = children[i]; 1579 child.dispatchSystemUiVisibilityChanged(visible); 1580 } 1581 } 1582 1583 @Override 1584 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1585 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1586 1587 final int count = mChildrenCount; 1588 final View[] children = mChildren; 1589 for (int i=0; i <count; i++) { 1590 final View child = children[i]; 1591 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1592 } 1593 return changed; 1594 } 1595 1596 /** 1597 * {@inheritDoc} 1598 */ 1599 @Override 1600 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1601 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1602 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1603 return super.dispatchKeyEventPreIme(event); 1604 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1605 == PFLAG_HAS_BOUNDS) { 1606 return mFocused.dispatchKeyEventPreIme(event); 1607 } 1608 return false; 1609 } 1610 1611 /** 1612 * {@inheritDoc} 1613 */ 1614 @Override 1615 public boolean dispatchKeyEvent(KeyEvent event) { 1616 if (mInputEventConsistencyVerifier != null) { 1617 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1618 } 1619 1620 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1621 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1622 if (super.dispatchKeyEvent(event)) { 1623 return true; 1624 } 1625 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1626 == PFLAG_HAS_BOUNDS) { 1627 if (mFocused.dispatchKeyEvent(event)) { 1628 return true; 1629 } 1630 } 1631 1632 if (mInputEventConsistencyVerifier != null) { 1633 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1634 } 1635 return false; 1636 } 1637 1638 /** 1639 * {@inheritDoc} 1640 */ 1641 @Override 1642 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1643 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1644 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1645 return super.dispatchKeyShortcutEvent(event); 1646 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1647 == PFLAG_HAS_BOUNDS) { 1648 return mFocused.dispatchKeyShortcutEvent(event); 1649 } 1650 return false; 1651 } 1652 1653 /** 1654 * {@inheritDoc} 1655 */ 1656 @Override 1657 public boolean dispatchTrackballEvent(MotionEvent event) { 1658 if (mInputEventConsistencyVerifier != null) { 1659 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1660 } 1661 1662 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1663 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1664 if (super.dispatchTrackballEvent(event)) { 1665 return true; 1666 } 1667 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1668 == PFLAG_HAS_BOUNDS) { 1669 if (mFocused.dispatchTrackballEvent(event)) { 1670 return true; 1671 } 1672 } 1673 1674 if (mInputEventConsistencyVerifier != null) { 1675 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1676 } 1677 return false; 1678 } 1679 1680 /** 1681 * {@inheritDoc} 1682 */ 1683 @SuppressWarnings({"ConstantConditions"}) 1684 @Override 1685 protected boolean dispatchHoverEvent(MotionEvent event) { 1686 final int action = event.getAction(); 1687 1688 // First check whether the view group wants to intercept the hover event. 1689 final boolean interceptHover = onInterceptHoverEvent(event); 1690 event.setAction(action); // restore action in case it was changed 1691 1692 MotionEvent eventNoHistory = event; 1693 boolean handled = false; 1694 1695 // Send events to the hovered children and build a new list of hover targets until 1696 // one is found that handles the event. 1697 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1698 mFirstHoverTarget = null; 1699 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1700 final float x = event.getX(); 1701 final float y = event.getY(); 1702 final int childrenCount = mChildrenCount; 1703 if (childrenCount != 0) { 1704 final ArrayList<View> preorderedList = buildOrderedChildList(); 1705 final boolean customOrder = preorderedList == null 1706 && isChildrenDrawingOrderEnabled(); 1707 final View[] children = mChildren; 1708 HoverTarget lastHoverTarget = null; 1709 for (int i = childrenCount - 1; i >= 0; i--) { 1710 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1711 final View child = (preorderedList == null) 1712 ? children[childIndex] : preorderedList.get(childIndex); 1713 if (!canViewReceivePointerEvents(child) 1714 || !isTransformedTouchPointInView(x, y, child, null)) { 1715 continue; 1716 } 1717 1718 // Obtain a hover target for this child. Dequeue it from the 1719 // old hover target list if the child was previously hovered. 1720 HoverTarget hoverTarget = firstOldHoverTarget; 1721 final boolean wasHovered; 1722 for (HoverTarget predecessor = null; ;) { 1723 if (hoverTarget == null) { 1724 hoverTarget = HoverTarget.obtain(child); 1725 wasHovered = false; 1726 break; 1727 } 1728 1729 if (hoverTarget.child == child) { 1730 if (predecessor != null) { 1731 predecessor.next = hoverTarget.next; 1732 } else { 1733 firstOldHoverTarget = hoverTarget.next; 1734 } 1735 hoverTarget.next = null; 1736 wasHovered = true; 1737 break; 1738 } 1739 1740 predecessor = hoverTarget; 1741 hoverTarget = hoverTarget.next; 1742 } 1743 1744 // Enqueue the hover target onto the new hover target list. 1745 if (lastHoverTarget != null) { 1746 lastHoverTarget.next = hoverTarget; 1747 } else { 1748 mFirstHoverTarget = hoverTarget; 1749 } 1750 lastHoverTarget = hoverTarget; 1751 1752 // Dispatch the event to the child. 1753 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1754 if (!wasHovered) { 1755 // Send the enter as is. 1756 handled |= dispatchTransformedGenericPointerEvent( 1757 event, child); // enter 1758 } 1759 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1760 if (!wasHovered) { 1761 // Synthesize an enter from a move. 1762 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1763 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1764 handled |= dispatchTransformedGenericPointerEvent( 1765 eventNoHistory, child); // enter 1766 eventNoHistory.setAction(action); 1767 1768 handled |= dispatchTransformedGenericPointerEvent( 1769 eventNoHistory, child); // move 1770 } else { 1771 // Send the move as is. 1772 handled |= dispatchTransformedGenericPointerEvent(event, child); 1773 } 1774 } 1775 if (handled) { 1776 break; 1777 } 1778 } 1779 if (preorderedList != null) preorderedList.clear(); 1780 } 1781 } 1782 1783 // Send exit events to all previously hovered children that are no longer hovered. 1784 while (firstOldHoverTarget != null) { 1785 final View child = firstOldHoverTarget.child; 1786 1787 // Exit the old hovered child. 1788 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1789 // Send the exit as is. 1790 handled |= dispatchTransformedGenericPointerEvent( 1791 event, child); // exit 1792 } else { 1793 // Synthesize an exit from a move or enter. 1794 // Ignore the result because hover focus has moved to a different view. 1795 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1796 dispatchTransformedGenericPointerEvent( 1797 event, child); // move 1798 } 1799 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1800 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1801 dispatchTransformedGenericPointerEvent( 1802 eventNoHistory, child); // exit 1803 eventNoHistory.setAction(action); 1804 } 1805 1806 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1807 firstOldHoverTarget.recycle(); 1808 firstOldHoverTarget = nextOldHoverTarget; 1809 } 1810 1811 // Send events to the view group itself if no children have handled it. 1812 boolean newHoveredSelf = !handled; 1813 if (newHoveredSelf == mHoveredSelf) { 1814 if (newHoveredSelf) { 1815 // Send event to the view group as before. 1816 handled |= super.dispatchHoverEvent(event); 1817 } 1818 } else { 1819 if (mHoveredSelf) { 1820 // Exit the view group. 1821 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1822 // Send the exit as is. 1823 handled |= super.dispatchHoverEvent(event); // exit 1824 } else { 1825 // Synthesize an exit from a move or enter. 1826 // Ignore the result because hover focus is moving to a different view. 1827 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1828 super.dispatchHoverEvent(event); // move 1829 } 1830 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1831 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1832 super.dispatchHoverEvent(eventNoHistory); // exit 1833 eventNoHistory.setAction(action); 1834 } 1835 mHoveredSelf = false; 1836 } 1837 1838 if (newHoveredSelf) { 1839 // Enter the view group. 1840 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1841 // Send the enter as is. 1842 handled |= super.dispatchHoverEvent(event); // enter 1843 mHoveredSelf = true; 1844 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1845 // Synthesize an enter from a move. 1846 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1847 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1848 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1849 eventNoHistory.setAction(action); 1850 1851 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1852 mHoveredSelf = true; 1853 } 1854 } 1855 } 1856 1857 // Recycle the copy of the event that we made. 1858 if (eventNoHistory != event) { 1859 eventNoHistory.recycle(); 1860 } 1861 1862 // Done. 1863 return handled; 1864 } 1865 1866 private void exitHoverTargets() { 1867 if (mHoveredSelf || mFirstHoverTarget != null) { 1868 final long now = SystemClock.uptimeMillis(); 1869 MotionEvent event = MotionEvent.obtain(now, now, 1870 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1871 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1872 dispatchHoverEvent(event); 1873 event.recycle(); 1874 } 1875 } 1876 1877 private void cancelHoverTarget(View view) { 1878 HoverTarget predecessor = null; 1879 HoverTarget target = mFirstHoverTarget; 1880 while (target != null) { 1881 final HoverTarget next = target.next; 1882 if (target.child == view) { 1883 if (predecessor == null) { 1884 mFirstHoverTarget = next; 1885 } else { 1886 predecessor.next = next; 1887 } 1888 target.recycle(); 1889 1890 final long now = SystemClock.uptimeMillis(); 1891 MotionEvent event = MotionEvent.obtain(now, now, 1892 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1893 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1894 view.dispatchHoverEvent(event); 1895 event.recycle(); 1896 return; 1897 } 1898 predecessor = target; 1899 target = next; 1900 } 1901 } 1902 1903 /** @hide */ 1904 @Override 1905 protected boolean hasHoveredChild() { 1906 return mFirstHoverTarget != null; 1907 } 1908 1909 @Override 1910 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1911 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1912 try { 1913 final int childrenCount = children.getChildCount(); 1914 for (int i = 0; i < childrenCount; i++) { 1915 View child = children.getChildAt(i); 1916 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1917 if (child.includeForAccessibility()) { 1918 childrenForAccessibility.add(child); 1919 } else { 1920 child.addChildrenForAccessibility(childrenForAccessibility); 1921 } 1922 } 1923 } 1924 } finally { 1925 children.recycle(); 1926 } 1927 } 1928 1929 /** 1930 * Implement this method to intercept hover events before they are handled 1931 * by child views. 1932 * <p> 1933 * This method is called before dispatching a hover event to a child of 1934 * the view group or to the view group's own {@link #onHoverEvent} to allow 1935 * the view group a chance to intercept the hover event. 1936 * This method can also be used to watch all pointer motions that occur within 1937 * the bounds of the view group even when the pointer is hovering over 1938 * a child of the view group rather than over the view group itself. 1939 * </p><p> 1940 * The view group can prevent its children from receiving hover events by 1941 * implementing this method and returning <code>true</code> to indicate 1942 * that it would like to intercept hover events. The view group must 1943 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1944 * for as long as it wishes to continue intercepting hover events from 1945 * its children. 1946 * </p><p> 1947 * Interception preserves the invariant that at most one view can be 1948 * hovered at a time by transferring hover focus from the currently hovered 1949 * child to the view group or vice-versa as needed. 1950 * </p><p> 1951 * If this method returns <code>true</code> and a child is already hovered, then the 1952 * child view will first receive a hover exit event and then the view group 1953 * itself will receive a hover enter event in {@link #onHoverEvent}. 1954 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1955 * events and instead returns <code>false</code> while the pointer is hovering 1956 * within the bounds of one of a child, then the view group will first receive a 1957 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1958 * receive a hover enter event. 1959 * </p><p> 1960 * The default implementation always returns false. 1961 * </p> 1962 * 1963 * @param event The motion event that describes the hover. 1964 * @return True if the view group would like to intercept the hover event 1965 * and prevent its children from receiving it. 1966 */ 1967 public boolean onInterceptHoverEvent(MotionEvent event) { 1968 return false; 1969 } 1970 1971 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1972 if (event.getHistorySize() == 0) { 1973 return event; 1974 } 1975 return MotionEvent.obtainNoHistory(event); 1976 } 1977 1978 /** 1979 * {@inheritDoc} 1980 */ 1981 @Override 1982 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1983 // Send the event to the child under the pointer. 1984 final int childrenCount = mChildrenCount; 1985 if (childrenCount != 0) { 1986 final float x = event.getX(); 1987 final float y = event.getY(); 1988 1989 final ArrayList<View> preorderedList = buildOrderedChildList(); 1990 final boolean customOrder = preorderedList == null 1991 && isChildrenDrawingOrderEnabled(); 1992 final View[] children = mChildren; 1993 for (int i = childrenCount - 1; i >= 0; i--) { 1994 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1995 final View child = (preorderedList == null) 1996 ? children[childIndex] : preorderedList.get(childIndex); 1997 if (!canViewReceivePointerEvents(child) 1998 || !isTransformedTouchPointInView(x, y, child, null)) { 1999 continue; 2000 } 2001 2002 if (dispatchTransformedGenericPointerEvent(event, child)) { 2003 if (preorderedList != null) preorderedList.clear(); 2004 return true; 2005 } 2006 } 2007 if (preorderedList != null) preorderedList.clear(); 2008 } 2009 2010 // No child handled the event. Send it to this view group. 2011 return super.dispatchGenericPointerEvent(event); 2012 } 2013 2014 /** 2015 * {@inheritDoc} 2016 */ 2017 @Override 2018 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 2019 // Send the event to the focused child or to this view group if it has focus. 2020 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 2021 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 2022 return super.dispatchGenericFocusedEvent(event); 2023 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 2024 == PFLAG_HAS_BOUNDS) { 2025 return mFocused.dispatchGenericMotionEvent(event); 2026 } 2027 return false; 2028 } 2029 2030 /** 2031 * Dispatches a generic pointer event to a child, taking into account 2032 * transformations that apply to the child. 2033 * 2034 * @param event The event to send. 2035 * @param child The view to send the event to. 2036 * @return {@code true} if the child handled the event. 2037 */ 2038 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 2039 final float offsetX = mScrollX - child.mLeft; 2040 final float offsetY = mScrollY - child.mTop; 2041 2042 boolean handled; 2043 if (!child.hasIdentityMatrix()) { 2044 MotionEvent transformedEvent = MotionEvent.obtain(event); 2045 transformedEvent.offsetLocation(offsetX, offsetY); 2046 transformedEvent.transform(child.getInverseMatrix()); 2047 handled = child.dispatchGenericMotionEvent(transformedEvent); 2048 transformedEvent.recycle(); 2049 } else { 2050 event.offsetLocation(offsetX, offsetY); 2051 handled = child.dispatchGenericMotionEvent(event); 2052 event.offsetLocation(-offsetX, -offsetY); 2053 } 2054 return handled; 2055 } 2056 2057 /** 2058 * {@inheritDoc} 2059 */ 2060 @Override 2061 public boolean dispatchTouchEvent(MotionEvent ev) { 2062 if (mInputEventConsistencyVerifier != null) { 2063 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 2064 } 2065 2066 // If the event targets the accessibility focused view and this is it, start 2067 // normal event dispatch. Maybe a descendant is what will handle the click. 2068 if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) { 2069 ev.setTargetAccessibilityFocus(false); 2070 } 2071 2072 boolean handled = false; 2073 if (onFilterTouchEventForSecurity(ev)) { 2074 final int action = ev.getAction(); 2075 final int actionMasked = action & MotionEvent.ACTION_MASK; 2076 2077 // Handle an initial down. 2078 if (actionMasked == MotionEvent.ACTION_DOWN) { 2079 // Throw away all previous state when starting a new touch gesture. 2080 // The framework may have dropped the up or cancel event for the previous gesture 2081 // due to an app switch, ANR, or some other state change. 2082 cancelAndClearTouchTargets(ev); 2083 resetTouchState(); 2084 } 2085 2086 // Check for interception. 2087 final boolean intercepted; 2088 if (actionMasked == MotionEvent.ACTION_DOWN 2089 || mFirstTouchTarget != null) { 2090 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 2091 if (!disallowIntercept) { 2092 intercepted = onInterceptTouchEvent(ev); 2093 ev.setAction(action); // restore action in case it was changed 2094 } else { 2095 intercepted = false; 2096 } 2097 } else { 2098 // There are no touch targets and this action is not an initial down 2099 // so this view group continues to intercept touches. 2100 intercepted = true; 2101 } 2102 2103 // If intercepted, start normal event dispatch. Also if there is already 2104 // a view that is handling the gesture, do normal event dispatch. 2105 if (intercepted || mFirstTouchTarget != null) { 2106 ev.setTargetAccessibilityFocus(false); 2107 } 2108 2109 // Check for cancelation. 2110 final boolean canceled = resetCancelNextUpFlag(this) 2111 || actionMasked == MotionEvent.ACTION_CANCEL; 2112 2113 // Update list of touch targets for pointer down, if needed. 2114 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 2115 TouchTarget newTouchTarget = null; 2116 boolean alreadyDispatchedToNewTouchTarget = false; 2117 if (!canceled && !intercepted) { 2118 2119 // If the event is targeting accessiiblity focus we give it to the 2120 // view that has accessibility focus and if it does not handle it 2121 // we clear the flag and dispatch the event to all children as usual. 2122 // We are looking up the accessibility focused host to avoid keeping 2123 // state since these events are very rare. 2124 View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus() 2125 ? findChildWithAccessibilityFocus() : null; 2126 2127 if (actionMasked == MotionEvent.ACTION_DOWN 2128 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 2129 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2130 final int actionIndex = ev.getActionIndex(); // always 0 for down 2131 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 2132 : TouchTarget.ALL_POINTER_IDS; 2133 2134 // Clean up earlier touch targets for this pointer id in case they 2135 // have become out of sync. 2136 removePointersFromTouchTargets(idBitsToAssign); 2137 2138 final int childrenCount = mChildrenCount; 2139 if (newTouchTarget == null && childrenCount != 0) { 2140 final float x = ev.getX(actionIndex); 2141 final float y = ev.getY(actionIndex); 2142 // Find a child that can receive the event. 2143 // Scan children from front to back. 2144 final ArrayList<View> preorderedList = buildOrderedChildList(); 2145 final boolean customOrder = preorderedList == null 2146 && isChildrenDrawingOrderEnabled(); 2147 final View[] children = mChildren; 2148 for (int i = childrenCount - 1; i >= 0; i--) { 2149 final int childIndex = customOrder 2150 ? getChildDrawingOrder(childrenCount, i) : i; 2151 final View child = (preorderedList == null) 2152 ? children[childIndex] : preorderedList.get(childIndex); 2153 2154 // If there is a view that has accessibility focus we want it 2155 // to get the event first and if not handled we will perform a 2156 // normal dispatch. We may do a double iteration but this is 2157 // safer given the timeframe. 2158 if (childWithAccessibilityFocus != null) { 2159 if (childWithAccessibilityFocus != child) { 2160 continue; 2161 } 2162 childWithAccessibilityFocus = null; 2163 i = childrenCount - 1; 2164 } 2165 2166 if (!canViewReceivePointerEvents(child) 2167 || !isTransformedTouchPointInView(x, y, child, null)) { 2168 ev.setTargetAccessibilityFocus(false); 2169 continue; 2170 } 2171 2172 newTouchTarget = getTouchTarget(child); 2173 if (newTouchTarget != null) { 2174 // Child is already receiving touch within its bounds. 2175 // Give it the new pointer in addition to the ones it is handling. 2176 newTouchTarget.pointerIdBits |= idBitsToAssign; 2177 break; 2178 } 2179 2180 resetCancelNextUpFlag(child); 2181 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 2182 // Child wants to receive touch within its bounds. 2183 mLastTouchDownTime = ev.getDownTime(); 2184 if (preorderedList != null) { 2185 // childIndex points into presorted list, find original index 2186 for (int j = 0; j < childrenCount; j++) { 2187 if (children[childIndex] == mChildren[j]) { 2188 mLastTouchDownIndex = j; 2189 break; 2190 } 2191 } 2192 } else { 2193 mLastTouchDownIndex = childIndex; 2194 } 2195 mLastTouchDownX = ev.getX(); 2196 mLastTouchDownY = ev.getY(); 2197 newTouchTarget = addTouchTarget(child, idBitsToAssign); 2198 alreadyDispatchedToNewTouchTarget = true; 2199 break; 2200 } 2201 2202 // The accessibility focus didn't handle the event, so clear 2203 // the flag and do a normal dispatch to all children. 2204 ev.setTargetAccessibilityFocus(false); 2205 } 2206 if (preorderedList != null) preorderedList.clear(); 2207 } 2208 2209 if (newTouchTarget == null && mFirstTouchTarget != null) { 2210 // Did not find a child to receive the event. 2211 // Assign the pointer to the least recently added target. 2212 newTouchTarget = mFirstTouchTarget; 2213 while (newTouchTarget.next != null) { 2214 newTouchTarget = newTouchTarget.next; 2215 } 2216 newTouchTarget.pointerIdBits |= idBitsToAssign; 2217 } 2218 } 2219 } 2220 2221 // Dispatch to touch targets. 2222 if (mFirstTouchTarget == null) { 2223 // No touch targets so treat this as an ordinary view. 2224 handled = dispatchTransformedTouchEvent(ev, canceled, null, 2225 TouchTarget.ALL_POINTER_IDS); 2226 } else { 2227 // Dispatch to touch targets, excluding the new touch target if we already 2228 // dispatched to it. Cancel touch targets if necessary. 2229 TouchTarget predecessor = null; 2230 TouchTarget target = mFirstTouchTarget; 2231 while (target != null) { 2232 final TouchTarget next = target.next; 2233 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 2234 handled = true; 2235 } else { 2236 final boolean cancelChild = resetCancelNextUpFlag(target.child) 2237 || intercepted; 2238 if (dispatchTransformedTouchEvent(ev, cancelChild, 2239 target.child, target.pointerIdBits)) { 2240 handled = true; 2241 } 2242 if (cancelChild) { 2243 if (predecessor == null) { 2244 mFirstTouchTarget = next; 2245 } else { 2246 predecessor.next = next; 2247 } 2248 target.recycle(); 2249 target = next; 2250 continue; 2251 } 2252 } 2253 predecessor = target; 2254 target = next; 2255 } 2256 } 2257 2258 // Update list of touch targets for pointer up or cancel, if needed. 2259 if (canceled 2260 || actionMasked == MotionEvent.ACTION_UP 2261 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2262 resetTouchState(); 2263 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2264 final int actionIndex = ev.getActionIndex(); 2265 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2266 removePointersFromTouchTargets(idBitsToRemove); 2267 } 2268 } 2269 2270 if (!handled && mInputEventConsistencyVerifier != null) { 2271 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2272 } 2273 return handled; 2274 } 2275 2276 /** 2277 * Finds the child which has accessibility focus. 2278 * 2279 * @return The child that has focus. 2280 */ 2281 private View findChildWithAccessibilityFocus() { 2282 ViewRootImpl viewRoot = getViewRootImpl(); 2283 if (viewRoot == null) { 2284 return null; 2285 } 2286 2287 View current = viewRoot.getAccessibilityFocusedHost(); 2288 if (current == null) { 2289 return null; 2290 } 2291 2292 ViewParent parent = current.getParent(); 2293 while (parent instanceof View) { 2294 if (parent == this) { 2295 return current; 2296 } 2297 current = (View) parent; 2298 parent = current.getParent(); 2299 } 2300 2301 return null; 2302 } 2303 2304 /** 2305 * Resets all touch state in preparation for a new cycle. 2306 */ 2307 private void resetTouchState() { 2308 clearTouchTargets(); 2309 resetCancelNextUpFlag(this); 2310 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2311 mNestedScrollAxes = SCROLL_AXIS_NONE; 2312 } 2313 2314 /** 2315 * Resets the cancel next up flag. 2316 * Returns true if the flag was previously set. 2317 */ 2318 private static boolean resetCancelNextUpFlag(View view) { 2319 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2320 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2321 return true; 2322 } 2323 return false; 2324 } 2325 2326 /** 2327 * Clears all touch targets. 2328 */ 2329 private void clearTouchTargets() { 2330 TouchTarget target = mFirstTouchTarget; 2331 if (target != null) { 2332 do { 2333 TouchTarget next = target.next; 2334 target.recycle(); 2335 target = next; 2336 } while (target != null); 2337 mFirstTouchTarget = null; 2338 } 2339 } 2340 2341 /** 2342 * Cancels and clears all touch targets. 2343 */ 2344 private void cancelAndClearTouchTargets(MotionEvent event) { 2345 if (mFirstTouchTarget != null) { 2346 boolean syntheticEvent = false; 2347 if (event == null) { 2348 final long now = SystemClock.uptimeMillis(); 2349 event = MotionEvent.obtain(now, now, 2350 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2351 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2352 syntheticEvent = true; 2353 } 2354 2355 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2356 resetCancelNextUpFlag(target.child); 2357 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2358 } 2359 clearTouchTargets(); 2360 2361 if (syntheticEvent) { 2362 event.recycle(); 2363 } 2364 } 2365 } 2366 2367 /** 2368 * Gets the touch target for specified child view. 2369 * Returns null if not found. 2370 */ 2371 private TouchTarget getTouchTarget(View child) { 2372 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2373 if (target.child == child) { 2374 return target; 2375 } 2376 } 2377 return null; 2378 } 2379 2380 /** 2381 * Adds a touch target for specified child to the beginning of the list. 2382 * Assumes the target child is not already present. 2383 */ 2384 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2385 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2386 target.next = mFirstTouchTarget; 2387 mFirstTouchTarget = target; 2388 return target; 2389 } 2390 2391 /** 2392 * Removes the pointer ids from consideration. 2393 */ 2394 private void removePointersFromTouchTargets(int pointerIdBits) { 2395 TouchTarget predecessor = null; 2396 TouchTarget target = mFirstTouchTarget; 2397 while (target != null) { 2398 final TouchTarget next = target.next; 2399 if ((target.pointerIdBits & pointerIdBits) != 0) { 2400 target.pointerIdBits &= ~pointerIdBits; 2401 if (target.pointerIdBits == 0) { 2402 if (predecessor == null) { 2403 mFirstTouchTarget = next; 2404 } else { 2405 predecessor.next = next; 2406 } 2407 target.recycle(); 2408 target = next; 2409 continue; 2410 } 2411 } 2412 predecessor = target; 2413 target = next; 2414 } 2415 } 2416 2417 private void cancelTouchTarget(View view) { 2418 TouchTarget predecessor = null; 2419 TouchTarget target = mFirstTouchTarget; 2420 while (target != null) { 2421 final TouchTarget next = target.next; 2422 if (target.child == view) { 2423 if (predecessor == null) { 2424 mFirstTouchTarget = next; 2425 } else { 2426 predecessor.next = next; 2427 } 2428 target.recycle(); 2429 2430 final long now = SystemClock.uptimeMillis(); 2431 MotionEvent event = MotionEvent.obtain(now, now, 2432 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2433 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2434 view.dispatchTouchEvent(event); 2435 event.recycle(); 2436 return; 2437 } 2438 predecessor = target; 2439 target = next; 2440 } 2441 } 2442 2443 /** 2444 * Returns true if a child view can receive pointer events. 2445 * @hide 2446 */ 2447 private static boolean canViewReceivePointerEvents(View child) { 2448 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2449 || child.getAnimation() != null; 2450 } 2451 2452 private float[] getTempPoint() { 2453 if (mTempPoint == null) { 2454 mTempPoint = new float[2]; 2455 } 2456 return mTempPoint; 2457 } 2458 2459 /** 2460 * Returns true if a child view contains the specified point when transformed 2461 * into its coordinate space. 2462 * Child must not be null. 2463 * @hide 2464 */ 2465 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2466 PointF outLocalPoint) { 2467 final float[] point = getTempPoint(); 2468 point[0] = x; 2469 point[1] = y; 2470 transformPointToViewLocal(point, child); 2471 final boolean isInView = child.pointInView(point[0], point[1]); 2472 if (isInView && outLocalPoint != null) { 2473 outLocalPoint.set(point[0], point[1]); 2474 } 2475 return isInView; 2476 } 2477 2478 /** 2479 * @hide 2480 */ 2481 public void transformPointToViewLocal(float[] point, View child) { 2482 point[0] += mScrollX - child.mLeft; 2483 point[1] += mScrollY - child.mTop; 2484 2485 if (!child.hasIdentityMatrix()) { 2486 child.getInverseMatrix().mapPoints(point); 2487 } 2488 } 2489 2490 /** 2491 * Transforms a motion event into the coordinate space of a particular child view, 2492 * filters out irrelevant pointer ids, and overrides its action if necessary. 2493 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2494 */ 2495 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2496 View child, int desiredPointerIdBits) { 2497 final boolean handled; 2498 2499 // Canceling motions is a special case. We don't need to perform any transformations 2500 // or filtering. The important part is the action, not the contents. 2501 final int oldAction = event.getAction(); 2502 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2503 event.setAction(MotionEvent.ACTION_CANCEL); 2504 if (child == null) { 2505 handled = super.dispatchTouchEvent(event); 2506 } else { 2507 handled = child.dispatchTouchEvent(event); 2508 } 2509 event.setAction(oldAction); 2510 return handled; 2511 } 2512 2513 // Calculate the number of pointers to deliver. 2514 final int oldPointerIdBits = event.getPointerIdBits(); 2515 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2516 2517 // If for some reason we ended up in an inconsistent state where it looks like we 2518 // might produce a motion event with no pointers in it, then drop the event. 2519 if (newPointerIdBits == 0) { 2520 return false; 2521 } 2522 2523 // If the number of pointers is the same and we don't need to perform any fancy 2524 // irreversible transformations, then we can reuse the motion event for this 2525 // dispatch as long as we are careful to revert any changes we make. 2526 // Otherwise we need to make a copy. 2527 final MotionEvent transformedEvent; 2528 if (newPointerIdBits == oldPointerIdBits) { 2529 if (child == null || child.hasIdentityMatrix()) { 2530 if (child == null) { 2531 handled = super.dispatchTouchEvent(event); 2532 } else { 2533 final float offsetX = mScrollX - child.mLeft; 2534 final float offsetY = mScrollY - child.mTop; 2535 event.offsetLocation(offsetX, offsetY); 2536 2537 handled = child.dispatchTouchEvent(event); 2538 2539 event.offsetLocation(-offsetX, -offsetY); 2540 } 2541 return handled; 2542 } 2543 transformedEvent = MotionEvent.obtain(event); 2544 } else { 2545 transformedEvent = event.split(newPointerIdBits); 2546 } 2547 2548 // Perform any necessary transformations and dispatch. 2549 if (child == null) { 2550 handled = super.dispatchTouchEvent(transformedEvent); 2551 } else { 2552 final float offsetX = mScrollX - child.mLeft; 2553 final float offsetY = mScrollY - child.mTop; 2554 transformedEvent.offsetLocation(offsetX, offsetY); 2555 if (! child.hasIdentityMatrix()) { 2556 transformedEvent.transform(child.getInverseMatrix()); 2557 } 2558 2559 handled = child.dispatchTouchEvent(transformedEvent); 2560 } 2561 2562 // Done. 2563 transformedEvent.recycle(); 2564 return handled; 2565 } 2566 2567 /** 2568 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2569 * dispatch. This behavior is enabled by default for applications that target an 2570 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2571 * 2572 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2573 * views depending on where each pointer initially went down. This allows for user interactions 2574 * such as scrolling two panes of content independently, chording of buttons, and performing 2575 * independent gestures on different pieces of content. 2576 * 2577 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2578 * child views. <code>false</code> to only allow one child view to be the target of 2579 * any MotionEvent received by this ViewGroup. 2580 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2581 */ 2582 public void setMotionEventSplittingEnabled(boolean split) { 2583 // TODO Applications really shouldn't change this setting mid-touch event, 2584 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2585 // with gestures in progress when this is changed. 2586 if (split) { 2587 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2588 } else { 2589 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2590 } 2591 } 2592 2593 /** 2594 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2595 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2596 */ 2597 public boolean isMotionEventSplittingEnabled() { 2598 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2599 } 2600 2601 /** 2602 * Returns true if this ViewGroup should be considered as a single entity for removal 2603 * when executing an Activity transition. If this is false, child elements will move 2604 * individually during the transition. 2605 * 2606 * @return True if the ViewGroup should be acted on together during an Activity transition. 2607 * The default value is true when there is a non-null background or if 2608 * {@link #getTransitionName()} is not null or if a 2609 * non-null {@link android.view.ViewOutlineProvider} other than 2610 * {@link android.view.ViewOutlineProvider#BACKGROUND} was given to 2611 * {@link #setOutlineProvider(ViewOutlineProvider)} and false otherwise. 2612 */ 2613 public boolean isTransitionGroup() { 2614 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2615 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2616 } else { 2617 final ViewOutlineProvider outlineProvider = getOutlineProvider(); 2618 return getBackground() != null || getTransitionName() != null || 2619 (outlineProvider != null && outlineProvider != ViewOutlineProvider.BACKGROUND); 2620 } 2621 } 2622 2623 /** 2624 * Changes whether or not this ViewGroup should be treated as a single entity during 2625 * Activity Transitions. 2626 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2627 * in Activity transitions. If false, the ViewGroup won't transition, 2628 * only its children. If true, the entire ViewGroup will transition 2629 * together. 2630 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity, 2631 * android.util.Pair[]) 2632 */ 2633 public void setTransitionGroup(boolean isTransitionGroup) { 2634 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2635 if (isTransitionGroup) { 2636 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2637 } else { 2638 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2639 } 2640 } 2641 2642 /** 2643 * {@inheritDoc} 2644 */ 2645 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2646 2647 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2648 // We're already in this state, assume our ancestors are too 2649 return; 2650 } 2651 2652 if (disallowIntercept) { 2653 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2654 } else { 2655 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2656 } 2657 2658 // Pass it up to our parent 2659 if (mParent != null) { 2660 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2661 } 2662 } 2663 2664 /** 2665 * Implement this method to intercept all touch screen motion events. This 2666 * allows you to watch events as they are dispatched to your children, and 2667 * take ownership of the current gesture at any point. 2668 * 2669 * <p>Using this function takes some care, as it has a fairly complicated 2670 * interaction with {@link View#onTouchEvent(MotionEvent) 2671 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2672 * that method as well as this one in the correct way. Events will be 2673 * received in the following order: 2674 * 2675 * <ol> 2676 * <li> You will receive the down event here. 2677 * <li> The down event will be handled either by a child of this view 2678 * group, or given to your own onTouchEvent() method to handle; this means 2679 * you should implement onTouchEvent() to return true, so you will 2680 * continue to see the rest of the gesture (instead of looking for 2681 * a parent view to handle it). Also, by returning true from 2682 * onTouchEvent(), you will not receive any following 2683 * events in onInterceptTouchEvent() and all touch processing must 2684 * happen in onTouchEvent() like normal. 2685 * <li> For as long as you return false from this function, each following 2686 * event (up to and including the final up) will be delivered first here 2687 * and then to the target's onTouchEvent(). 2688 * <li> If you return true from here, you will not receive any 2689 * following events: the target view will receive the same event but 2690 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2691 * events will be delivered to your onTouchEvent() method and no longer 2692 * appear here. 2693 * </ol> 2694 * 2695 * @param ev The motion event being dispatched down the hierarchy. 2696 * @return Return true to steal motion events from the children and have 2697 * them dispatched to this ViewGroup through onTouchEvent(). 2698 * The current target will receive an ACTION_CANCEL event, and no further 2699 * messages will be delivered here. 2700 */ 2701 public boolean onInterceptTouchEvent(MotionEvent ev) { 2702 return false; 2703 } 2704 2705 /** 2706 * {@inheritDoc} 2707 * 2708 * Looks for a view to give focus to respecting the setting specified by 2709 * {@link #getDescendantFocusability()}. 2710 * 2711 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2712 * find focus within the children of this group when appropriate. 2713 * 2714 * @see #FOCUS_BEFORE_DESCENDANTS 2715 * @see #FOCUS_AFTER_DESCENDANTS 2716 * @see #FOCUS_BLOCK_DESCENDANTS 2717 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2718 */ 2719 @Override 2720 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2721 if (DBG) { 2722 System.out.println(this + " ViewGroup.requestFocus direction=" 2723 + direction); 2724 } 2725 int descendantFocusability = getDescendantFocusability(); 2726 2727 switch (descendantFocusability) { 2728 case FOCUS_BLOCK_DESCENDANTS: 2729 return super.requestFocus(direction, previouslyFocusedRect); 2730 case FOCUS_BEFORE_DESCENDANTS: { 2731 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2732 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2733 } 2734 case FOCUS_AFTER_DESCENDANTS: { 2735 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2736 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2737 } 2738 default: 2739 throw new IllegalStateException("descendant focusability must be " 2740 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2741 + "but is " + descendantFocusability); 2742 } 2743 } 2744 2745 /** 2746 * Look for a descendant to call {@link View#requestFocus} on. 2747 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2748 * when it wants to request focus within its children. Override this to 2749 * customize how your {@link ViewGroup} requests focus within its children. 2750 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2751 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2752 * to give a finer grained hint about where focus is coming from. May be null 2753 * if there is no hint. 2754 * @return Whether focus was taken. 2755 */ 2756 @SuppressWarnings({"ConstantConditions"}) 2757 protected boolean onRequestFocusInDescendants(int direction, 2758 Rect previouslyFocusedRect) { 2759 int index; 2760 int increment; 2761 int end; 2762 int count = mChildrenCount; 2763 if ((direction & FOCUS_FORWARD) != 0) { 2764 index = 0; 2765 increment = 1; 2766 end = count; 2767 } else { 2768 index = count - 1; 2769 increment = -1; 2770 end = -1; 2771 } 2772 final View[] children = mChildren; 2773 for (int i = index; i != end; i += increment) { 2774 View child = children[i]; 2775 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2776 if (child.requestFocus(direction, previouslyFocusedRect)) { 2777 return true; 2778 } 2779 } 2780 } 2781 return false; 2782 } 2783 2784 /** 2785 * {@inheritDoc} 2786 * 2787 * @hide 2788 */ 2789 @Override 2790 public void dispatchStartTemporaryDetach() { 2791 super.dispatchStartTemporaryDetach(); 2792 final int count = mChildrenCount; 2793 final View[] children = mChildren; 2794 for (int i = 0; i < count; i++) { 2795 children[i].dispatchStartTemporaryDetach(); 2796 } 2797 } 2798 2799 /** 2800 * {@inheritDoc} 2801 * 2802 * @hide 2803 */ 2804 @Override 2805 public void dispatchFinishTemporaryDetach() { 2806 super.dispatchFinishTemporaryDetach(); 2807 final int count = mChildrenCount; 2808 final View[] children = mChildren; 2809 for (int i = 0; i < count; i++) { 2810 children[i].dispatchFinishTemporaryDetach(); 2811 } 2812 } 2813 2814 /** 2815 * {@inheritDoc} 2816 */ 2817 @Override 2818 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2819 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2820 super.dispatchAttachedToWindow(info, visibility); 2821 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2822 2823 final int count = mChildrenCount; 2824 final View[] children = mChildren; 2825 for (int i = 0; i < count; i++) { 2826 final View child = children[i]; 2827 child.dispatchAttachedToWindow(info, 2828 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2829 } 2830 final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 2831 for (int i = 0; i < transientCount; ++i) { 2832 View view = mTransientViews.get(i); 2833 view.dispatchAttachedToWindow(info, visibility | (view.mViewFlags & VISIBILITY_MASK)); 2834 } 2835 } 2836 2837 @Override 2838 void dispatchScreenStateChanged(int screenState) { 2839 super.dispatchScreenStateChanged(screenState); 2840 2841 final int count = mChildrenCount; 2842 final View[] children = mChildren; 2843 for (int i = 0; i < count; i++) { 2844 children[i].dispatchScreenStateChanged(screenState); 2845 } 2846 } 2847 2848 /** @hide */ 2849 @Override 2850 public boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2851 boolean handled = false; 2852 if (includeForAccessibility()) { 2853 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2854 if (handled) { 2855 return handled; 2856 } 2857 } 2858 // Let our children have a shot in populating the event. 2859 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2860 try { 2861 final int childCount = children.getChildCount(); 2862 for (int i = 0; i < childCount; i++) { 2863 View child = children.getChildAt(i); 2864 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2865 handled = child.dispatchPopulateAccessibilityEvent(event); 2866 if (handled) { 2867 return handled; 2868 } 2869 } 2870 } 2871 } finally { 2872 children.recycle(); 2873 } 2874 return false; 2875 } 2876 2877 /** 2878 * Dispatch creation of {@link ViewAssistStructure} down the hierarchy. This implementation 2879 * adds in all child views of the view group, in addition to calling the default View 2880 * implementation. 2881 */ 2882 public void dispatchProvideAssistStructure(ViewAssistStructure structure) { 2883 super.dispatchProvideAssistStructure(structure); 2884 if (!isAssistBlocked()) { 2885 if (structure.getChildCount() == 0) { 2886 final int childrenCount = getChildCount(); 2887 if (childrenCount > 0) { 2888 structure.setChildCount(childrenCount); 2889 final ArrayList<View> preorderedList = buildOrderedChildList(); 2890 final boolean customOrder = preorderedList == null 2891 && isChildrenDrawingOrderEnabled(); 2892 final View[] children = mChildren; 2893 for (int i=0; i<childrenCount; i++) { 2894 final int childIndex = customOrder 2895 ? getChildDrawingOrder(childrenCount, i) : i; 2896 final View child = (preorderedList == null) 2897 ? children[childIndex] : preorderedList.get(childIndex); 2898 ViewAssistStructure cstructure = structure.newChild(i); 2899 child.dispatchProvideAssistStructure(cstructure); 2900 } 2901 } 2902 } 2903 } 2904 } 2905 2906 /** @hide */ 2907 @Override 2908 public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2909 super.onInitializeAccessibilityNodeInfoInternal(info); 2910 if (getAccessibilityNodeProvider() != null) { 2911 return; 2912 } 2913 if (mAttachInfo != null) { 2914 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2915 childrenForAccessibility.clear(); 2916 addChildrenForAccessibility(childrenForAccessibility); 2917 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2918 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2919 final View child = childrenForAccessibility.get(i); 2920 info.addChildUnchecked(child); 2921 } 2922 childrenForAccessibility.clear(); 2923 } 2924 } 2925 2926 /** @hide */ 2927 @Override 2928 public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2929 super.onInitializeAccessibilityEventInternal(event); 2930 event.setClassName(ViewGroup.class.getName()); 2931 } 2932 2933 @Override 2934 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2935 // If this is a live region, we should send a subtree change event 2936 // from this view. Otherwise, we can let it propagate up. 2937 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2938 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2939 } else if (mParent != null) { 2940 try { 2941 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2942 } catch (AbstractMethodError e) { 2943 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2944 " does not fully implement ViewParent", e); 2945 } 2946 } 2947 } 2948 2949 @Override 2950 void resetSubtreeAccessibilityStateChanged() { 2951 super.resetSubtreeAccessibilityStateChanged(); 2952 View[] children = mChildren; 2953 final int childCount = mChildrenCount; 2954 for (int i = 0; i < childCount; i++) { 2955 children[i].resetSubtreeAccessibilityStateChanged(); 2956 } 2957 } 2958 2959 /** 2960 * {@inheritDoc} 2961 * 2962 * <p>Subclasses should always call <code>super.onNestedPrePerformAccessibilityAction</code></p> 2963 * 2964 * @param target The target view dispatching this action 2965 * @param action Action being performed; see 2966 * {@link android.view.accessibility.AccessibilityNodeInfo} 2967 * @param args Optional action arguments 2968 * @return false by default. Subclasses should return true if they handle the event. 2969 */ 2970 @Override 2971 public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle args) { 2972 return false; 2973 } 2974 2975 /** 2976 * {@inheritDoc} 2977 */ 2978 @Override 2979 void dispatchDetachedFromWindow() { 2980 // If we still have a touch target, we are still in the process of 2981 // dispatching motion events to a child; we need to get rid of that 2982 // child to avoid dispatching events to it after the window is torn 2983 // down. To make sure we keep the child in a consistent state, we 2984 // first send it an ACTION_CANCEL motion event. 2985 cancelAndClearTouchTargets(null); 2986 2987 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2988 exitHoverTargets(); 2989 2990 // In case view is detached while transition is running 2991 mLayoutCalledWhileSuppressed = false; 2992 2993 // Tear down our drag tracking 2994 mDragNotifiedChildren = null; 2995 if (mCurrentDrag != null) { 2996 mCurrentDrag.recycle(); 2997 mCurrentDrag = null; 2998 } 2999 3000 final int count = mChildrenCount; 3001 final View[] children = mChildren; 3002 for (int i = 0; i < count; i++) { 3003 children[i].dispatchDetachedFromWindow(); 3004 } 3005 clearDisappearingChildren(); 3006 final int transientCount = mTransientViews == null ? 0 : mTransientIndices.size(); 3007 for (int i = 0; i < transientCount; ++i) { 3008 View view = mTransientViews.get(i); 3009 view.dispatchDetachedFromWindow(); 3010 } 3011 super.dispatchDetachedFromWindow(); 3012 } 3013 3014 /** 3015 * @hide 3016 */ 3017 @Override 3018 protected void internalSetPadding(int left, int top, int right, int bottom) { 3019 super.internalSetPadding(left, top, right, bottom); 3020 3021 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 3022 mGroupFlags |= FLAG_PADDING_NOT_NULL; 3023 } else { 3024 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 3025 } 3026 } 3027 3028 /** 3029 * {@inheritDoc} 3030 */ 3031 @Override 3032 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 3033 super.dispatchSaveInstanceState(container); 3034 final int count = mChildrenCount; 3035 final View[] children = mChildren; 3036 for (int i = 0; i < count; i++) { 3037 View c = children[i]; 3038 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3039 c.dispatchSaveInstanceState(container); 3040 } 3041 } 3042 } 3043 3044 /** 3045 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 3046 * to only this view, not to its children. For use when overriding 3047 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 3048 * subclasses to freeze their own state but not the state of their children. 3049 * 3050 * @param container the container 3051 */ 3052 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 3053 super.dispatchSaveInstanceState(container); 3054 } 3055 3056 /** 3057 * {@inheritDoc} 3058 */ 3059 @Override 3060 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 3061 super.dispatchRestoreInstanceState(container); 3062 final int count = mChildrenCount; 3063 final View[] children = mChildren; 3064 for (int i = 0; i < count; i++) { 3065 View c = children[i]; 3066 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3067 c.dispatchRestoreInstanceState(container); 3068 } 3069 } 3070 } 3071 3072 /** 3073 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 3074 * to only this view, not to its children. For use when overriding 3075 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 3076 * subclasses to thaw their own state but not the state of their children. 3077 * 3078 * @param container the container 3079 */ 3080 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 3081 super.dispatchRestoreInstanceState(container); 3082 } 3083 3084 /** 3085 * Enables or disables the drawing cache for each child of this view group. 3086 * 3087 * @param enabled true to enable the cache, false to dispose of it 3088 */ 3089 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 3090 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 3091 final View[] children = mChildren; 3092 final int count = mChildrenCount; 3093 for (int i = 0; i < count; i++) { 3094 children[i].setDrawingCacheEnabled(enabled); 3095 } 3096 } 3097 } 3098 3099 @Override 3100 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 3101 int count = mChildrenCount; 3102 int[] visibilities = null; 3103 3104 if (skipChildren) { 3105 visibilities = new int[count]; 3106 for (int i = 0; i < count; i++) { 3107 View child = getChildAt(i); 3108 visibilities[i] = child.getVisibility(); 3109 if (visibilities[i] == View.VISIBLE) { 3110 child.setVisibility(INVISIBLE); 3111 } 3112 } 3113 } 3114 3115 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 3116 3117 if (skipChildren) { 3118 for (int i = 0; i < count; i++) { 3119 getChildAt(i).setVisibility(visibilities[i]); 3120 } 3121 } 3122 3123 return b; 3124 } 3125 3126 /** Return true if this ViewGroup is laying out using optical bounds. */ 3127 boolean isLayoutModeOptical() { 3128 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 3129 } 3130 3131 Insets computeOpticalInsets() { 3132 if (isLayoutModeOptical()) { 3133 int left = 0; 3134 int top = 0; 3135 int right = 0; 3136 int bottom = 0; 3137 for (int i = 0; i < mChildrenCount; i++) { 3138 View child = getChildAt(i); 3139 if (child.getVisibility() == VISIBLE) { 3140 Insets insets = child.getOpticalInsets(); 3141 left = Math.max(left, insets.left); 3142 top = Math.max(top, insets.top); 3143 right = Math.max(right, insets.right); 3144 bottom = Math.max(bottom, insets.bottom); 3145 } 3146 } 3147 return Insets.of(left, top, right, bottom); 3148 } else { 3149 return Insets.NONE; 3150 } 3151 } 3152 3153 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 3154 if (x1 != x2 && y1 != y2) { 3155 if (x1 > x2) { 3156 int tmp = x1; x1 = x2; x2 = tmp; 3157 } 3158 if (y1 > y2) { 3159 int tmp = y1; y1 = y2; y2 = tmp; 3160 } 3161 canvas.drawRect(x1, y1, x2, y2, paint); 3162 } 3163 } 3164 3165 private static int sign(int x) { 3166 return (x >= 0) ? 1 : -1; 3167 } 3168 3169 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 3170 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 3171 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 3172 } 3173 3174 private int dipsToPixels(int dips) { 3175 float scale = getContext().getResources().getDisplayMetrics().density; 3176 return (int) (dips * scale + 0.5f); 3177 } 3178 3179 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 3180 int lineLength, int lineWidth) { 3181 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 3182 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 3183 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 3184 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 3185 } 3186 3187 private static void fillDifference(Canvas canvas, 3188 int x2, int y2, int x3, int y3, 3189 int dx1, int dy1, int dx2, int dy2, Paint paint) { 3190 int x1 = x2 - dx1; 3191 int y1 = y2 - dy1; 3192 3193 int x4 = x3 + dx2; 3194 int y4 = y3 + dy2; 3195 3196 fillRect(canvas, paint, x1, y1, x4, y2); 3197 fillRect(canvas, paint, x1, y2, x2, y3); 3198 fillRect(canvas, paint, x3, y2, x4, y3); 3199 fillRect(canvas, paint, x1, y3, x4, y4); 3200 } 3201 3202 /** 3203 * @hide 3204 */ 3205 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 3206 for (int i = 0; i < getChildCount(); i++) { 3207 View c = getChildAt(i); 3208 c.getLayoutParams().onDebugDraw(c, canvas, paint); 3209 } 3210 } 3211 3212 /** 3213 * @hide 3214 */ 3215 protected void onDebugDraw(Canvas canvas) { 3216 Paint paint = getDebugPaint(); 3217 3218 // Draw optical bounds 3219 { 3220 paint.setColor(Color.RED); 3221 paint.setStyle(Paint.Style.STROKE); 3222 3223 for (int i = 0; i < getChildCount(); i++) { 3224 View c = getChildAt(i); 3225 Insets insets = c.getOpticalInsets(); 3226 3227 drawRect(canvas, paint, 3228 c.getLeft() + insets.left, 3229 c.getTop() + insets.top, 3230 c.getRight() - insets.right - 1, 3231 c.getBottom() - insets.bottom - 1); 3232 } 3233 } 3234 3235 // Draw margins 3236 { 3237 paint.setColor(Color.argb(63, 255, 0, 255)); 3238 paint.setStyle(Paint.Style.FILL); 3239 3240 onDebugDrawMargins(canvas, paint); 3241 } 3242 3243 // Draw clip bounds 3244 { 3245 paint.setColor(Color.rgb(63, 127, 255)); 3246 paint.setStyle(Paint.Style.FILL); 3247 3248 int lineLength = dipsToPixels(8); 3249 int lineWidth = dipsToPixels(1); 3250 for (int i = 0; i < getChildCount(); i++) { 3251 View c = getChildAt(i); 3252 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 3253 paint, lineLength, lineWidth); 3254 } 3255 } 3256 } 3257 3258 /** 3259 * {@inheritDoc} 3260 */ 3261 @Override 3262 protected void dispatchDraw(Canvas canvas) { 3263 boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode); 3264 final int childrenCount = mChildrenCount; 3265 final View[] children = mChildren; 3266 int flags = mGroupFlags; 3267 3268 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 3269 final boolean buildCache = !isHardwareAccelerated(); 3270 for (int i = 0; i < childrenCount; i++) { 3271 final View child = children[i]; 3272 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3273 final LayoutParams params = child.getLayoutParams(); 3274 attachLayoutAnimationParameters(child, params, i, childrenCount); 3275 bindLayoutAnimation(child); 3276 } 3277 } 3278 3279 final LayoutAnimationController controller = mLayoutAnimationController; 3280 if (controller.willOverlap()) { 3281 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 3282 } 3283 3284 controller.start(); 3285 3286 mGroupFlags &= ~FLAG_RUN_ANIMATION; 3287 mGroupFlags &= ~FLAG_ANIMATION_DONE; 3288 3289 if (mAnimationListener != null) { 3290 mAnimationListener.onAnimationStart(controller.getAnimation()); 3291 } 3292 } 3293 3294 int clipSaveCount = 0; 3295 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3296 if (clipToPadding) { 3297 clipSaveCount = canvas.save(); 3298 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 3299 mScrollX + mRight - mLeft - mPaddingRight, 3300 mScrollY + mBottom - mTop - mPaddingBottom); 3301 } 3302 3303 // We will draw our child's animation, let's reset the flag 3304 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 3305 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 3306 3307 boolean more = false; 3308 final long drawingTime = getDrawingTime(); 3309 3310 if (usingRenderNodeProperties) canvas.insertReorderBarrier(); 3311 final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 3312 int transientIndex = transientCount != 0 ? 0 : -1; 3313 // Only use the preordered list if not HW accelerated, since the HW pipeline will do the 3314 // draw reordering internally 3315 final ArrayList<View> preorderedList = usingRenderNodeProperties 3316 ? null : buildOrderedChildList(); 3317 final boolean customOrder = preorderedList == null 3318 && isChildrenDrawingOrderEnabled(); 3319 for (int i = 0; i < childrenCount; i++) { 3320 while (transientIndex >= 0 && mTransientIndices.get(transientIndex) == i) { 3321 final View transientChild = mTransientViews.get(transientIndex); 3322 if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE || 3323 transientChild.getAnimation() != null) { 3324 more |= drawChild(canvas, transientChild, drawingTime); 3325 } 3326 transientIndex++; 3327 if (transientIndex >= transientCount) { 3328 transientIndex = -1; 3329 } 3330 } 3331 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 3332 final View child = (preorderedList == null) 3333 ? children[childIndex] : preorderedList.get(childIndex); 3334 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 3335 more |= drawChild(canvas, child, drawingTime); 3336 } 3337 } 3338 while (transientIndex >= 0) { 3339 // there may be additional transient views after the normal views 3340 final View transientChild = mTransientViews.get(transientIndex); 3341 if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE || 3342 transientChild.getAnimation() != null) { 3343 more |= drawChild(canvas, transientChild, drawingTime); 3344 } 3345 transientIndex++; 3346 if (transientIndex >= transientCount) { 3347 break; 3348 } 3349 } 3350 if (preorderedList != null) preorderedList.clear(); 3351 3352 // Draw any disappearing views that have animations 3353 if (mDisappearingChildren != null) { 3354 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3355 final int disappearingCount = disappearingChildren.size() - 1; 3356 // Go backwards -- we may delete as animations finish 3357 for (int i = disappearingCount; i >= 0; i--) { 3358 final View child = disappearingChildren.get(i); 3359 more |= drawChild(canvas, child, drawingTime); 3360 } 3361 } 3362 if (usingRenderNodeProperties) canvas.insertInorderBarrier(); 3363 3364 if (debugDraw()) { 3365 onDebugDraw(canvas); 3366 } 3367 3368 if (clipToPadding) { 3369 canvas.restoreToCount(clipSaveCount); 3370 } 3371 3372 // mGroupFlags might have been updated by drawChild() 3373 flags = mGroupFlags; 3374 3375 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3376 invalidate(true); 3377 } 3378 3379 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3380 mLayoutAnimationController.isDone() && !more) { 3381 // We want to erase the drawing cache and notify the listener after the 3382 // next frame is drawn because one extra invalidate() is caused by 3383 // drawChild() after the animation is over 3384 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3385 final Runnable end = new Runnable() { 3386 public void run() { 3387 notifyAnimationListener(); 3388 } 3389 }; 3390 post(end); 3391 } 3392 } 3393 3394 /** 3395 * Returns the ViewGroupOverlay for this view group, creating it if it does 3396 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3397 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3398 * views, like overlay drawables, are visual-only; they do not receive input 3399 * events and should not be used as anything other than a temporary 3400 * representation of a view in a parent container, such as might be used 3401 * by an animation effect. 3402 * 3403 * <p>Note: Overlays do not currently work correctly with {@link 3404 * SurfaceView} or {@link TextureView}; contents in overlays for these 3405 * types of views may not display correctly.</p> 3406 * 3407 * @return The ViewGroupOverlay object for this view. 3408 * @see ViewGroupOverlay 3409 */ 3410 @Override 3411 public ViewGroupOverlay getOverlay() { 3412 if (mOverlay == null) { 3413 mOverlay = new ViewGroupOverlay(mContext, this); 3414 } 3415 return (ViewGroupOverlay) mOverlay; 3416 } 3417 3418 /** 3419 * Returns the index of the child to draw for this iteration. Override this 3420 * if you want to change the drawing order of children. By default, it 3421 * returns i. 3422 * <p> 3423 * NOTE: In order for this method to be called, you must enable child ordering 3424 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3425 * 3426 * @param i The current iteration. 3427 * @return The index of the child to draw this iteration. 3428 * 3429 * @see #setChildrenDrawingOrderEnabled(boolean) 3430 * @see #isChildrenDrawingOrderEnabled() 3431 */ 3432 protected int getChildDrawingOrder(int childCount, int i) { 3433 return i; 3434 } 3435 3436 private boolean hasChildWithZ() { 3437 for (int i = 0; i < mChildrenCount; i++) { 3438 if (mChildren[i].getZ() != 0) return true; 3439 } 3440 return false; 3441 } 3442 3443 /** 3444 * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children, 3445 * sorted first by Z, then by child drawing order (if applicable). This list must be cleared 3446 * after use to avoid leaking child Views. 3447 * 3448 * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated 3449 * children. 3450 */ 3451 ArrayList<View> buildOrderedChildList() { 3452 final int count = mChildrenCount; 3453 if (count <= 1 || !hasChildWithZ()) return null; 3454 3455 if (mPreSortedChildren == null) { 3456 mPreSortedChildren = new ArrayList<View>(count); 3457 } else { 3458 mPreSortedChildren.ensureCapacity(count); 3459 } 3460 3461 final boolean useCustomOrder = isChildrenDrawingOrderEnabled(); 3462 for (int i = 0; i < mChildrenCount; i++) { 3463 // add next child (in child order) to end of list 3464 int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i; 3465 View nextChild = mChildren[childIndex]; 3466 float currentZ = nextChild.getZ(); 3467 3468 // insert ahead of any Views with greater Z 3469 int insertIndex = i; 3470 while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) { 3471 insertIndex--; 3472 } 3473 mPreSortedChildren.add(insertIndex, nextChild); 3474 } 3475 return mPreSortedChildren; 3476 } 3477 3478 private void notifyAnimationListener() { 3479 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3480 mGroupFlags |= FLAG_ANIMATION_DONE; 3481 3482 if (mAnimationListener != null) { 3483 final Runnable end = new Runnable() { 3484 public void run() { 3485 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3486 } 3487 }; 3488 post(end); 3489 } 3490 3491 invalidate(true); 3492 } 3493 3494 /** 3495 * This method is used to cause children of this ViewGroup to restore or recreate their 3496 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3497 * to recreate its own display list, which would happen if it went through the normal 3498 * draw/dispatchDraw mechanisms. 3499 * 3500 * @hide 3501 */ 3502 @Override 3503 protected void dispatchGetDisplayList() { 3504 final int count = mChildrenCount; 3505 final View[] children = mChildren; 3506 for (int i = 0; i < count; i++) { 3507 final View child = children[i]; 3508 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null)) { 3509 recreateChildDisplayList(child); 3510 } 3511 } 3512 if (mOverlay != null) { 3513 View overlayView = mOverlay.getOverlayView(); 3514 recreateChildDisplayList(overlayView); 3515 } 3516 if (mDisappearingChildren != null) { 3517 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3518 final int disappearingCount = disappearingChildren.size(); 3519 for (int i = 0; i < disappearingCount; ++i) { 3520 final View child = disappearingChildren.get(i); 3521 recreateChildDisplayList(child); 3522 } 3523 } 3524 } 3525 3526 private void recreateChildDisplayList(View child) { 3527 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3528 == PFLAG_INVALIDATED; 3529 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3530 child.getDisplayList(); 3531 child.mRecreateDisplayList = false; 3532 } 3533 3534 /** 3535 * Draw one child of this View Group. This method is responsible for getting 3536 * the canvas in the right state. This includes clipping, translating so 3537 * that the child's scrolled origin is at 0, 0, and applying any animation 3538 * transformations. 3539 * 3540 * @param canvas The canvas on which to draw the child 3541 * @param child Who to draw 3542 * @param drawingTime The time at which draw is occurring 3543 * @return True if an invalidate() was issued 3544 */ 3545 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3546 return child.draw(canvas, this, drawingTime); 3547 } 3548 3549 /** 3550 * Returns whether this group's children are clipped to their bounds before drawing. 3551 * The default value is true. 3552 * @see #setClipChildren(boolean) 3553 * 3554 * @return True if the group's children will be clipped to their bounds, 3555 * false otherwise. 3556 */ 3557 @ViewDebug.ExportedProperty(category = "drawing") 3558 public boolean getClipChildren() { 3559 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3560 } 3561 3562 /** 3563 * By default, children are clipped to their bounds before drawing. This 3564 * allows view groups to override this behavior for animations, etc. 3565 * 3566 * @param clipChildren true to clip children to their bounds, 3567 * false otherwise 3568 * @attr ref android.R.styleable#ViewGroup_clipChildren 3569 */ 3570 public void setClipChildren(boolean clipChildren) { 3571 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3572 if (clipChildren != previousValue) { 3573 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3574 for (int i = 0; i < mChildrenCount; ++i) { 3575 View child = getChildAt(i); 3576 if (child.mRenderNode != null) { 3577 child.mRenderNode.setClipToBounds(clipChildren); 3578 } 3579 } 3580 invalidate(true); 3581 } 3582 } 3583 3584 /** 3585 * Sets whether this ViewGroup will clip its children to its padding, if 3586 * padding is present. 3587 * <p> 3588 * By default, children are clipped to the padding of their parent 3589 * Viewgroup. This clipping behavior is only enabled if padding is non-zero. 3590 * 3591 * @param clipToPadding true to clip children to the padding of the 3592 * group, false otherwise 3593 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3594 */ 3595 public void setClipToPadding(boolean clipToPadding) { 3596 if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) { 3597 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3598 invalidate(true); 3599 } 3600 } 3601 3602 /** 3603 * Returns whether this ViewGroup will clip its children to its padding, if 3604 * padding is present. 3605 * <p> 3606 * By default, children are clipped to the padding of their parent 3607 * Viewgroup. This clipping behavior is only enabled if padding is non-zero. 3608 * 3609 * @return true if this ViewGroup clips children to its padding, false otherwise 3610 * 3611 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3612 */ 3613 @ViewDebug.ExportedProperty(category = "drawing") 3614 public boolean getClipToPadding() { 3615 return hasBooleanFlag(FLAG_CLIP_TO_PADDING); 3616 } 3617 3618 /** 3619 * {@inheritDoc} 3620 */ 3621 @Override 3622 public void dispatchSetSelected(boolean selected) { 3623 final View[] children = mChildren; 3624 final int count = mChildrenCount; 3625 for (int i = 0; i < count; i++) { 3626 children[i].setSelected(selected); 3627 } 3628 } 3629 3630 /** 3631 * {@inheritDoc} 3632 */ 3633 @Override 3634 public void dispatchSetActivated(boolean activated) { 3635 final View[] children = mChildren; 3636 final int count = mChildrenCount; 3637 for (int i = 0; i < count; i++) { 3638 children[i].setActivated(activated); 3639 } 3640 } 3641 3642 @Override 3643 protected void dispatchSetPressed(boolean pressed) { 3644 final View[] children = mChildren; 3645 final int count = mChildrenCount; 3646 for (int i = 0; i < count; i++) { 3647 final View child = children[i]; 3648 // Children that are clickable on their own should not 3649 // show a pressed state when their parent view does. 3650 // Clearing a pressed state always propagates. 3651 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3652 child.setPressed(pressed); 3653 } 3654 } 3655 } 3656 3657 /** 3658 * Dispatches drawable hotspot changes to child views that meet at least 3659 * one of the following criteria: 3660 * <ul> 3661 * <li>Returns {@code false} from both {@link View#isClickable()} and 3662 * {@link View#isLongClickable()}</li> 3663 * <li>Requests duplication of parent state via 3664 * {@link View#setDuplicateParentStateEnabled(boolean)}</li> 3665 * </ul> 3666 * 3667 * @param x hotspot x coordinate 3668 * @param y hotspot y coordinate 3669 * @see #drawableHotspotChanged(float, float) 3670 */ 3671 @Override 3672 public void dispatchDrawableHotspotChanged(float x, float y) { 3673 final int count = mChildrenCount; 3674 if (count == 0) { 3675 return; 3676 } 3677 3678 final View[] children = mChildren; 3679 for (int i = 0; i < count; i++) { 3680 final View child = children[i]; 3681 // Children that are clickable on their own should not 3682 // receive hotspots when their parent view does. 3683 final boolean nonActionable = !child.isClickable() && !child.isLongClickable(); 3684 final boolean duplicatesState = (child.mViewFlags & DUPLICATE_PARENT_STATE) != 0; 3685 if (nonActionable || duplicatesState) { 3686 final float[] point = getTempPoint(); 3687 point[0] = x; 3688 point[1] = y; 3689 transformPointToViewLocal(point, child); 3690 child.drawableHotspotChanged(point[0], point[1]); 3691 } 3692 } 3693 } 3694 3695 @Override 3696 void dispatchCancelPendingInputEvents() { 3697 super.dispatchCancelPendingInputEvents(); 3698 3699 final View[] children = mChildren; 3700 final int count = mChildrenCount; 3701 for (int i = 0; i < count; i++) { 3702 children[i].dispatchCancelPendingInputEvents(); 3703 } 3704 } 3705 3706 /** 3707 * When this property is set to true, this ViewGroup supports static transformations on 3708 * children; this causes 3709 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3710 * invoked when a child is drawn. 3711 * 3712 * Any subclass overriding 3713 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3714 * set this property to true. 3715 * 3716 * @param enabled True to enable static transformations on children, false otherwise. 3717 * 3718 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3719 */ 3720 protected void setStaticTransformationsEnabled(boolean enabled) { 3721 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3722 } 3723 3724 /** 3725 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3726 * boolean to indicate whether a static transform was set. The default implementation 3727 * simply returns <code>false</code>; subclasses may override this method for different 3728 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3729 * for this method to be called. 3730 * 3731 * @param child The child view whose static transform is being requested 3732 * @param t The Transformation which will hold the result 3733 * @return true if the transformation was set, false otherwise 3734 * @see #setStaticTransformationsEnabled(boolean) 3735 */ 3736 protected boolean getChildStaticTransformation(View child, Transformation t) { 3737 return false; 3738 } 3739 3740 Transformation getChildTransformation() { 3741 if (mChildTransformation == null) { 3742 mChildTransformation = new Transformation(); 3743 } 3744 return mChildTransformation; 3745 } 3746 3747 /** 3748 * {@hide} 3749 */ 3750 @Override 3751 protected View findViewTraversal(@IdRes int id) { 3752 if (id == mID) { 3753 return this; 3754 } 3755 3756 final View[] where = mChildren; 3757 final int len = mChildrenCount; 3758 3759 for (int i = 0; i < len; i++) { 3760 View v = where[i]; 3761 3762 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3763 v = v.findViewById(id); 3764 3765 if (v != null) { 3766 return v; 3767 } 3768 } 3769 } 3770 3771 return null; 3772 } 3773 3774 /** 3775 * {@hide} 3776 */ 3777 @Override 3778 protected View findViewWithTagTraversal(Object tag) { 3779 if (tag != null && tag.equals(mTag)) { 3780 return this; 3781 } 3782 3783 final View[] where = mChildren; 3784 final int len = mChildrenCount; 3785 3786 for (int i = 0; i < len; i++) { 3787 View v = where[i]; 3788 3789 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3790 v = v.findViewWithTag(tag); 3791 3792 if (v != null) { 3793 return v; 3794 } 3795 } 3796 } 3797 3798 return null; 3799 } 3800 3801 /** 3802 * {@hide} 3803 */ 3804 @Override 3805 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3806 if (predicate.apply(this)) { 3807 return this; 3808 } 3809 3810 final View[] where = mChildren; 3811 final int len = mChildrenCount; 3812 3813 for (int i = 0; i < len; i++) { 3814 View v = where[i]; 3815 3816 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3817 v = v.findViewByPredicate(predicate); 3818 3819 if (v != null) { 3820 return v; 3821 } 3822 } 3823 } 3824 3825 return null; 3826 } 3827 3828 /** 3829 * This method adds a view to this container at the specified index purely for the 3830 * purposes of allowing that view to draw even though it is not a normal child of 3831 * the container. That is, the view does not participate in layout, focus, accessibility, 3832 * input, or other normal view operations; it is purely an item to be drawn during the normal 3833 * rendering operation of this container. The index that it is added at is the order 3834 * in which it will be drawn, with respect to the other views in the container. 3835 * For example, a transient view added at index 0 will be drawn before all other views 3836 * in the container because it will be drawn first (including before any real view 3837 * at index 0). There can be more than one transient view at any particular index; 3838 * these views will be drawn in the order in which they were added to the list of 3839 * transient views. The index of transient views can also be greater than the number 3840 * of normal views in the container; that just means that they will be drawn after all 3841 * other views are drawn. 3842 * 3843 * <p>Note that since transient views do not participate in layout, they must be sized 3844 * manually or, more typically, they should just use the size that they had before they 3845 * were removed from their container.</p> 3846 * 3847 * <p>Transient views are useful for handling animations of views that have been removed 3848 * from the container, but which should be animated out after the removal. Adding these 3849 * views as transient views allows them to participate in drawing without side-effecting 3850 * the layout of the container.</p> 3851 * 3852 * <p>Transient views must always be explicitly {@link #removeTransientView(View) removed} 3853 * from the container when they are no longer needed. For example, a transient view 3854 * which is added in order to fade it out in its old location should be removed 3855 * once the animation is complete.</p> 3856 * 3857 * @param view The view to be added 3858 * @param index The index at which this view should be drawn, must be >= 0. 3859 * This value is relative to the {@link #getChildAt(int) index} values in the normal 3860 * child list of this container, where any transient view at a particular index will 3861 * be drawn before any normal child at that same index. 3862 * 3863 * @hide 3864 */ 3865 public void addTransientView(View view, int index) { 3866 if (index < 0) { 3867 return; 3868 } 3869 if (mTransientIndices == null) { 3870 mTransientIndices = new ArrayList<Integer>(); 3871 mTransientViews = new ArrayList<View>(); 3872 } 3873 final int oldSize = mTransientIndices.size(); 3874 if (oldSize > 0) { 3875 int insertionIndex; 3876 for (insertionIndex = 0; insertionIndex < oldSize; ++insertionIndex) { 3877 if (index < mTransientIndices.get(insertionIndex)) { 3878 break; 3879 } 3880 } 3881 mTransientIndices.add(insertionIndex, index); 3882 mTransientViews.add(insertionIndex, view); 3883 } else { 3884 mTransientIndices.add(index); 3885 mTransientViews.add(view); 3886 } 3887 view.mParent = this; 3888 view.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3889 invalidate(true); 3890 } 3891 3892 /** 3893 * Removes a view from the list of transient views in this container. If there is no 3894 * such transient view, this method does nothing. 3895 * 3896 * @param view The transient view to be removed 3897 * 3898 * @hide 3899 */ 3900 public void removeTransientView(View view) { 3901 if (mTransientViews == null) { 3902 return; 3903 } 3904 final int size = mTransientViews.size(); 3905 for (int i = 0; i < size; ++i) { 3906 if (view == mTransientViews.get(i)) { 3907 mTransientViews.remove(i); 3908 mTransientIndices.remove(i); 3909 view.mParent = null; 3910 view.dispatchDetachedFromWindow(); 3911 invalidate(true); 3912 return; 3913 } 3914 } 3915 } 3916 3917 /** 3918 * Returns the number of transient views in this container. Specific transient 3919 * views and the index at which they were added can be retrieved via 3920 * {@link #getTransientView(int)} and {@link #getTransientViewIndex(int)}. 3921 * 3922 * @see #addTransientView(View, int) 3923 * @return The number of transient views in this container 3924 * 3925 * @hide 3926 */ 3927 public int getTransientViewCount() { 3928 return mTransientIndices == null ? 0 : mTransientIndices.size(); 3929 } 3930 3931 /** 3932 * Given a valid position within the list of transient views, returns the index of 3933 * the transient view at that position. 3934 * 3935 * @param position The position of the index being queried. Must be at least 0 3936 * and less than the value returned by {@link #getTransientViewCount()}. 3937 * @return The index of the transient view stored in the given position if the 3938 * position is valid, otherwise -1 3939 * 3940 * @hide 3941 */ 3942 public int getTransientViewIndex(int position) { 3943 if (position < 0 || mTransientIndices == null || position >= mTransientIndices.size()) { 3944 return -1; 3945 } 3946 return mTransientIndices.get(position); 3947 } 3948 3949 /** 3950 * Given a valid position within the list of transient views, returns the 3951 * transient view at that position. 3952 * 3953 * @param position The position of the view being queried. Must be at least 0 3954 * and less than the value returned by {@link #getTransientViewCount()}. 3955 * @return The transient view stored in the given position if the 3956 * position is valid, otherwise null 3957 * 3958 * @hide 3959 */ 3960 public View getTransientView(int position) { 3961 if (mTransientViews == null || position >= mTransientViews.size()) { 3962 return null; 3963 } 3964 return mTransientViews.get(position); 3965 } 3966 3967 /** 3968 * <p>Adds a child view. If no layout parameters are already set on the child, the 3969 * default parameters for this ViewGroup are set on the child.</p> 3970 * 3971 * <p><strong>Note:</strong> do not invoke this method from 3972 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3973 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3974 * 3975 * @param child the child view to add 3976 * 3977 * @see #generateDefaultLayoutParams() 3978 */ 3979 public void addView(View child) { 3980 addView(child, -1); 3981 } 3982 3983 /** 3984 * Adds a child view. If no layout parameters are already set on the child, the 3985 * default parameters for this ViewGroup are set on the child. 3986 * 3987 * <p><strong>Note:</strong> do not invoke this method from 3988 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3989 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3990 * 3991 * @param child the child view to add 3992 * @param index the position at which to add the child 3993 * 3994 * @see #generateDefaultLayoutParams() 3995 */ 3996 public void addView(View child, int index) { 3997 if (child == null) { 3998 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3999 } 4000 LayoutParams params = child.getLayoutParams(); 4001 if (params == null) { 4002 params = generateDefaultLayoutParams(); 4003 if (params == null) { 4004 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 4005 } 4006 } 4007 addView(child, index, params); 4008 } 4009 4010 /** 4011 * Adds a child view with this ViewGroup's default layout parameters and the 4012 * specified width and height. 4013 * 4014 * <p><strong>Note:</strong> do not invoke this method from 4015 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4016 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4017 * 4018 * @param child the child view to add 4019 */ 4020 public void addView(View child, int width, int height) { 4021 final LayoutParams params = generateDefaultLayoutParams(); 4022 params.width = width; 4023 params.height = height; 4024 addView(child, -1, params); 4025 } 4026 4027 /** 4028 * Adds a child view with the specified layout parameters. 4029 * 4030 * <p><strong>Note:</strong> do not invoke this method from 4031 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4032 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4033 * 4034 * @param child the child view to add 4035 * @param params the layout parameters to set on the child 4036 */ 4037 public void addView(View child, LayoutParams params) { 4038 addView(child, -1, params); 4039 } 4040 4041 /** 4042 * Adds a child view with the specified layout parameters. 4043 * 4044 * <p><strong>Note:</strong> do not invoke this method from 4045 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4046 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4047 * 4048 * @param child the child view to add 4049 * @param index the position at which to add the child or -1 to add last 4050 * @param params the layout parameters to set on the child 4051 */ 4052 public void addView(View child, int index, LayoutParams params) { 4053 if (DBG) { 4054 System.out.println(this + " addView"); 4055 } 4056 4057 if (child == null) { 4058 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4059 } 4060 4061 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 4062 // therefore, we call requestLayout() on ourselves before, so that the child's request 4063 // will be blocked at our level 4064 requestLayout(); 4065 invalidate(true); 4066 addViewInner(child, index, params, false); 4067 } 4068 4069 /** 4070 * {@inheritDoc} 4071 */ 4072 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 4073 if (!checkLayoutParams(params)) { 4074 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 4075 } 4076 if (view.mParent != this) { 4077 throw new IllegalArgumentException("Given view not a child of " + this); 4078 } 4079 view.setLayoutParams(params); 4080 } 4081 4082 /** 4083 * {@inheritDoc} 4084 */ 4085 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 4086 return p != null; 4087 } 4088 4089 /** 4090 * Interface definition for a callback to be invoked when the hierarchy 4091 * within this view changed. The hierarchy changes whenever a child is added 4092 * to or removed from this view. 4093 */ 4094 public interface OnHierarchyChangeListener { 4095 /** 4096 * Called when a new child is added to a parent view. 4097 * 4098 * @param parent the view in which a child was added 4099 * @param child the new child view added in the hierarchy 4100 */ 4101 void onChildViewAdded(View parent, View child); 4102 4103 /** 4104 * Called when a child is removed from a parent view. 4105 * 4106 * @param parent the view from which the child was removed 4107 * @param child the child removed from the hierarchy 4108 */ 4109 void onChildViewRemoved(View parent, View child); 4110 } 4111 4112 /** 4113 * Register a callback to be invoked when a child is added to or removed 4114 * from this view. 4115 * 4116 * @param listener the callback to invoke on hierarchy change 4117 */ 4118 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 4119 mOnHierarchyChangeListener = listener; 4120 } 4121 4122 /** 4123 * @hide 4124 */ 4125 protected void onViewAdded(View child) { 4126 if (mOnHierarchyChangeListener != null) { 4127 mOnHierarchyChangeListener.onChildViewAdded(this, child); 4128 } 4129 } 4130 4131 /** 4132 * @hide 4133 */ 4134 protected void onViewRemoved(View child) { 4135 if (mOnHierarchyChangeListener != null) { 4136 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 4137 } 4138 } 4139 4140 private void clearCachedLayoutMode() { 4141 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4142 mLayoutMode = LAYOUT_MODE_UNDEFINED; 4143 } 4144 } 4145 4146 @Override 4147 protected void onAttachedToWindow() { 4148 super.onAttachedToWindow(); 4149 clearCachedLayoutMode(); 4150 } 4151 4152 @Override 4153 protected void onDetachedFromWindow() { 4154 super.onDetachedFromWindow(); 4155 clearCachedLayoutMode(); 4156 } 4157 4158 /** 4159 * Adds a view during layout. This is useful if in your onLayout() method, 4160 * you need to add more views (as does the list view for example). 4161 * 4162 * If index is negative, it means put it at the end of the list. 4163 * 4164 * @param child the view to add to the group 4165 * @param index the index at which the child must be added or -1 to add last 4166 * @param params the layout parameters to associate with the child 4167 * @return true if the child was added, false otherwise 4168 */ 4169 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 4170 return addViewInLayout(child, index, params, false); 4171 } 4172 4173 /** 4174 * Adds a view during layout. This is useful if in your onLayout() method, 4175 * you need to add more views (as does the list view for example). 4176 * 4177 * If index is negative, it means put it at the end of the list. 4178 * 4179 * @param child the view to add to the group 4180 * @param index the index at which the child must be added or -1 to add last 4181 * @param params the layout parameters to associate with the child 4182 * @param preventRequestLayout if true, calling this method will not trigger a 4183 * layout request on child 4184 * @return true if the child was added, false otherwise 4185 */ 4186 protected boolean addViewInLayout(View child, int index, LayoutParams params, 4187 boolean preventRequestLayout) { 4188 if (child == null) { 4189 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4190 } 4191 child.mParent = null; 4192 addViewInner(child, index, params, preventRequestLayout); 4193 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 4194 return true; 4195 } 4196 4197 /** 4198 * Prevents the specified child to be laid out during the next layout pass. 4199 * 4200 * @param child the child on which to perform the cleanup 4201 */ 4202 protected void cleanupLayoutState(View child) { 4203 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 4204 } 4205 4206 private void addViewInner(View child, int index, LayoutParams params, 4207 boolean preventRequestLayout) { 4208 4209 if (mTransition != null) { 4210 // Don't prevent other add transitions from completing, but cancel remove 4211 // transitions to let them complete the process before we add to the container 4212 mTransition.cancel(LayoutTransition.DISAPPEARING); 4213 } 4214 4215 if (child.getParent() != null) { 4216 throw new IllegalStateException("The specified child already has a parent. " + 4217 "You must call removeView() on the child's parent first."); 4218 } 4219 4220 if (mTransition != null) { 4221 mTransition.addChild(this, child); 4222 } 4223 4224 if (!checkLayoutParams(params)) { 4225 params = generateLayoutParams(params); 4226 } 4227 4228 if (preventRequestLayout) { 4229 child.mLayoutParams = params; 4230 } else { 4231 child.setLayoutParams(params); 4232 } 4233 4234 if (index < 0) { 4235 index = mChildrenCount; 4236 } 4237 4238 addInArray(child, index); 4239 4240 // tell our children 4241 if (preventRequestLayout) { 4242 child.assignParent(this); 4243 } else { 4244 child.mParent = this; 4245 } 4246 4247 if (child.hasFocus()) { 4248 requestChildFocus(child, child.findFocus()); 4249 } 4250 4251 AttachInfo ai = mAttachInfo; 4252 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 4253 boolean lastKeepOn = ai.mKeepScreenOn; 4254 ai.mKeepScreenOn = false; 4255 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 4256 if (ai.mKeepScreenOn) { 4257 needGlobalAttributesUpdate(true); 4258 } 4259 ai.mKeepScreenOn = lastKeepOn; 4260 } 4261 4262 if (child.isLayoutDirectionInherited()) { 4263 child.resetRtlProperties(); 4264 } 4265 4266 onViewAdded(child); 4267 4268 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 4269 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 4270 } 4271 4272 if (child.hasTransientState()) { 4273 childHasTransientStateChanged(child, true); 4274 } 4275 4276 if (child.getVisibility() != View.GONE) { 4277 notifySubtreeAccessibilityStateChangedIfNeeded(); 4278 } 4279 4280 if (mTransientIndices != null) { 4281 final int transientCount = mTransientIndices.size(); 4282 for (int i = 0; i < transientCount; ++i) { 4283 final int oldIndex = mTransientIndices.get(i); 4284 if (index <= oldIndex) { 4285 mTransientIndices.set(i, oldIndex + 1); 4286 } 4287 } 4288 } 4289 } 4290 4291 private void addInArray(View child, int index) { 4292 View[] children = mChildren; 4293 final int count = mChildrenCount; 4294 final int size = children.length; 4295 if (index == count) { 4296 if (size == count) { 4297 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4298 System.arraycopy(children, 0, mChildren, 0, size); 4299 children = mChildren; 4300 } 4301 children[mChildrenCount++] = child; 4302 } else if (index < count) { 4303 if (size == count) { 4304 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4305 System.arraycopy(children, 0, mChildren, 0, index); 4306 System.arraycopy(children, index, mChildren, index + 1, count - index); 4307 children = mChildren; 4308 } else { 4309 System.arraycopy(children, index, children, index + 1, count - index); 4310 } 4311 children[index] = child; 4312 mChildrenCount++; 4313 if (mLastTouchDownIndex >= index) { 4314 mLastTouchDownIndex++; 4315 } 4316 } else { 4317 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 4318 } 4319 } 4320 4321 // This method also sets the child's mParent to null 4322 private void removeFromArray(int index) { 4323 final View[] children = mChildren; 4324 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 4325 children[index].mParent = null; 4326 } 4327 final int count = mChildrenCount; 4328 if (index == count - 1) { 4329 children[--mChildrenCount] = null; 4330 } else if (index >= 0 && index < count) { 4331 System.arraycopy(children, index + 1, children, index, count - index - 1); 4332 children[--mChildrenCount] = null; 4333 } else { 4334 throw new IndexOutOfBoundsException(); 4335 } 4336 if (mLastTouchDownIndex == index) { 4337 mLastTouchDownTime = 0; 4338 mLastTouchDownIndex = -1; 4339 } else if (mLastTouchDownIndex > index) { 4340 mLastTouchDownIndex--; 4341 } 4342 } 4343 4344 // This method also sets the children's mParent to null 4345 private void removeFromArray(int start, int count) { 4346 final View[] children = mChildren; 4347 final int childrenCount = mChildrenCount; 4348 4349 start = Math.max(0, start); 4350 final int end = Math.min(childrenCount, start + count); 4351 4352 if (start == end) { 4353 return; 4354 } 4355 4356 if (end == childrenCount) { 4357 for (int i = start; i < end; i++) { 4358 children[i].mParent = null; 4359 children[i] = null; 4360 } 4361 } else { 4362 for (int i = start; i < end; i++) { 4363 children[i].mParent = null; 4364 } 4365 4366 // Since we're looping above, we might as well do the copy, but is arraycopy() 4367 // faster than the extra 2 bounds checks we would do in the loop? 4368 System.arraycopy(children, end, children, start, childrenCount - end); 4369 4370 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 4371 children[i] = null; 4372 } 4373 } 4374 4375 mChildrenCount -= (end - start); 4376 } 4377 4378 private void bindLayoutAnimation(View child) { 4379 Animation a = mLayoutAnimationController.getAnimationForView(child); 4380 child.setAnimation(a); 4381 } 4382 4383 /** 4384 * Subclasses should override this method to set layout animation 4385 * parameters on the supplied child. 4386 * 4387 * @param child the child to associate with animation parameters 4388 * @param params the child's layout parameters which hold the animation 4389 * parameters 4390 * @param index the index of the child in the view group 4391 * @param count the number of children in the view group 4392 */ 4393 protected void attachLayoutAnimationParameters(View child, 4394 LayoutParams params, int index, int count) { 4395 LayoutAnimationController.AnimationParameters animationParams = 4396 params.layoutAnimationParameters; 4397 if (animationParams == null) { 4398 animationParams = new LayoutAnimationController.AnimationParameters(); 4399 params.layoutAnimationParameters = animationParams; 4400 } 4401 4402 animationParams.count = count; 4403 animationParams.index = index; 4404 } 4405 4406 /** 4407 * {@inheritDoc} 4408 * 4409 * <p><strong>Note:</strong> do not invoke this method from 4410 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4411 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4412 */ 4413 public void removeView(View view) { 4414 if (removeViewInternal(view)) { 4415 requestLayout(); 4416 invalidate(true); 4417 } 4418 } 4419 4420 /** 4421 * Removes a view during layout. This is useful if in your onLayout() method, 4422 * you need to remove more views. 4423 * 4424 * <p><strong>Note:</strong> do not invoke this method from 4425 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4426 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4427 * 4428 * @param view the view to remove from the group 4429 */ 4430 public void removeViewInLayout(View view) { 4431 removeViewInternal(view); 4432 } 4433 4434 /** 4435 * Removes a range of views during layout. This is useful if in your onLayout() method, 4436 * you need to remove more views. 4437 * 4438 * <p><strong>Note:</strong> do not invoke this method from 4439 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4440 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4441 * 4442 * @param start the index of the first view to remove from the group 4443 * @param count the number of views to remove from the group 4444 */ 4445 public void removeViewsInLayout(int start, int count) { 4446 removeViewsInternal(start, count); 4447 } 4448 4449 /** 4450 * Removes the view at the specified position in the group. 4451 * 4452 * <p><strong>Note:</strong> do not invoke this method from 4453 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4454 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4455 * 4456 * @param index the position in the group of the view to remove 4457 */ 4458 public void removeViewAt(int index) { 4459 removeViewInternal(index, getChildAt(index)); 4460 requestLayout(); 4461 invalidate(true); 4462 } 4463 4464 /** 4465 * Removes the specified range of views from the group. 4466 * 4467 * <p><strong>Note:</strong> do not invoke this method from 4468 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4469 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4470 * 4471 * @param start the first position in the group of the range of views to remove 4472 * @param count the number of views to remove 4473 */ 4474 public void removeViews(int start, int count) { 4475 removeViewsInternal(start, count); 4476 requestLayout(); 4477 invalidate(true); 4478 } 4479 4480 private boolean removeViewInternal(View view) { 4481 final int index = indexOfChild(view); 4482 if (index >= 0) { 4483 removeViewInternal(index, view); 4484 return true; 4485 } 4486 return false; 4487 } 4488 4489 private void removeViewInternal(int index, View view) { 4490 4491 if (mTransition != null) { 4492 mTransition.removeChild(this, view); 4493 } 4494 4495 boolean clearChildFocus = false; 4496 if (view == mFocused) { 4497 view.unFocus(null); 4498 clearChildFocus = true; 4499 } 4500 4501 view.clearAccessibilityFocus(); 4502 4503 cancelTouchTarget(view); 4504 cancelHoverTarget(view); 4505 4506 if (view.getAnimation() != null || 4507 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4508 addDisappearingView(view); 4509 } else if (view.mAttachInfo != null) { 4510 view.dispatchDetachedFromWindow(); 4511 } 4512 4513 if (view.hasTransientState()) { 4514 childHasTransientStateChanged(view, false); 4515 } 4516 4517 needGlobalAttributesUpdate(false); 4518 4519 removeFromArray(index); 4520 4521 if (clearChildFocus) { 4522 clearChildFocus(view); 4523 if (!rootViewRequestFocus()) { 4524 notifyGlobalFocusCleared(this); 4525 } 4526 } 4527 4528 onViewRemoved(view); 4529 4530 if (view.getVisibility() != View.GONE) { 4531 notifySubtreeAccessibilityStateChangedIfNeeded(); 4532 } 4533 4534 int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size(); 4535 for (int i = 0; i < transientCount; ++i) { 4536 final int oldIndex = mTransientIndices.get(i); 4537 if (index < oldIndex) { 4538 mTransientIndices.set(i, oldIndex - 1); 4539 } 4540 } 4541 } 4542 4543 /** 4544 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4545 * not null, changes in layout which occur because of children being added to or removed from 4546 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4547 * object. By default, the transition object is null (so layout changes are not animated). 4548 * 4549 * <p>Replacing a non-null transition will cause that previous transition to be 4550 * canceled, if it is currently running, to restore this container to 4551 * its correct post-transition state.</p> 4552 * 4553 * @param transition The LayoutTransition object that will animated changes in layout. A value 4554 * of <code>null</code> means no transition will run on layout changes. 4555 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 4556 */ 4557 public void setLayoutTransition(LayoutTransition transition) { 4558 if (mTransition != null) { 4559 LayoutTransition previousTransition = mTransition; 4560 previousTransition.cancel(); 4561 previousTransition.removeTransitionListener(mLayoutTransitionListener); 4562 } 4563 mTransition = transition; 4564 if (mTransition != null) { 4565 mTransition.addTransitionListener(mLayoutTransitionListener); 4566 } 4567 } 4568 4569 /** 4570 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4571 * not null, changes in layout which occur because of children being added to or removed from 4572 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4573 * object. By default, the transition object is null (so layout changes are not animated). 4574 * 4575 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 4576 * A value of <code>null</code> means no transition will run on layout changes. 4577 */ 4578 public LayoutTransition getLayoutTransition() { 4579 return mTransition; 4580 } 4581 4582 private void removeViewsInternal(int start, int count) { 4583 final View focused = mFocused; 4584 final boolean detach = mAttachInfo != null; 4585 boolean clearChildFocus = false; 4586 4587 final View[] children = mChildren; 4588 final int end = start + count; 4589 4590 for (int i = start; i < end; i++) { 4591 final View view = children[i]; 4592 4593 if (mTransition != null) { 4594 mTransition.removeChild(this, view); 4595 } 4596 4597 if (view == focused) { 4598 view.unFocus(null); 4599 clearChildFocus = true; 4600 } 4601 4602 view.clearAccessibilityFocus(); 4603 4604 cancelTouchTarget(view); 4605 cancelHoverTarget(view); 4606 4607 if (view.getAnimation() != null || 4608 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4609 addDisappearingView(view); 4610 } else if (detach) { 4611 view.dispatchDetachedFromWindow(); 4612 } 4613 4614 if (view.hasTransientState()) { 4615 childHasTransientStateChanged(view, false); 4616 } 4617 4618 needGlobalAttributesUpdate(false); 4619 4620 onViewRemoved(view); 4621 } 4622 4623 removeFromArray(start, count); 4624 4625 if (clearChildFocus) { 4626 clearChildFocus(focused); 4627 if (!rootViewRequestFocus()) { 4628 notifyGlobalFocusCleared(focused); 4629 } 4630 } 4631 } 4632 4633 /** 4634 * Call this method to remove all child views from the 4635 * ViewGroup. 4636 * 4637 * <p><strong>Note:</strong> do not invoke this method from 4638 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4639 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4640 */ 4641 public void removeAllViews() { 4642 removeAllViewsInLayout(); 4643 requestLayout(); 4644 invalidate(true); 4645 } 4646 4647 /** 4648 * Called by a ViewGroup subclass to remove child views from itself, 4649 * when it must first know its size on screen before it can calculate how many 4650 * child views it will render. An example is a Gallery or a ListView, which 4651 * may "have" 50 children, but actually only render the number of children 4652 * that can currently fit inside the object on screen. Do not call 4653 * this method unless you are extending ViewGroup and understand the 4654 * view measuring and layout pipeline. 4655 * 4656 * <p><strong>Note:</strong> do not invoke this method from 4657 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4658 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4659 */ 4660 public void removeAllViewsInLayout() { 4661 final int count = mChildrenCount; 4662 if (count <= 0) { 4663 return; 4664 } 4665 4666 final View[] children = mChildren; 4667 mChildrenCount = 0; 4668 4669 final View focused = mFocused; 4670 final boolean detach = mAttachInfo != null; 4671 boolean clearChildFocus = false; 4672 4673 needGlobalAttributesUpdate(false); 4674 4675 for (int i = count - 1; i >= 0; i--) { 4676 final View view = children[i]; 4677 4678 if (mTransition != null) { 4679 mTransition.removeChild(this, view); 4680 } 4681 4682 if (view == focused) { 4683 view.unFocus(null); 4684 clearChildFocus = true; 4685 } 4686 4687 view.clearAccessibilityFocus(); 4688 4689 cancelTouchTarget(view); 4690 cancelHoverTarget(view); 4691 4692 if (view.getAnimation() != null || 4693 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4694 addDisappearingView(view); 4695 } else if (detach) { 4696 view.dispatchDetachedFromWindow(); 4697 } 4698 4699 if (view.hasTransientState()) { 4700 childHasTransientStateChanged(view, false); 4701 } 4702 4703 onViewRemoved(view); 4704 4705 view.mParent = null; 4706 children[i] = null; 4707 } 4708 4709 if (clearChildFocus) { 4710 clearChildFocus(focused); 4711 if (!rootViewRequestFocus()) { 4712 notifyGlobalFocusCleared(focused); 4713 } 4714 } 4715 } 4716 4717 /** 4718 * Finishes the removal of a detached view. This method will dispatch the detached from 4719 * window event and notify the hierarchy change listener. 4720 * <p> 4721 * This method is intended to be lightweight and makes no assumptions about whether the 4722 * parent or child should be redrawn. Proper use of this method will include also making 4723 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4724 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4725 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4726 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4727 * 4728 * @param child the child to be definitely removed from the view hierarchy 4729 * @param animate if true and the view has an animation, the view is placed in the 4730 * disappearing views list, otherwise, it is detached from the window 4731 * 4732 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4733 * @see #detachAllViewsFromParent() 4734 * @see #detachViewFromParent(View) 4735 * @see #detachViewFromParent(int) 4736 */ 4737 protected void removeDetachedView(View child, boolean animate) { 4738 if (mTransition != null) { 4739 mTransition.removeChild(this, child); 4740 } 4741 4742 if (child == mFocused) { 4743 child.clearFocus(); 4744 } 4745 4746 child.clearAccessibilityFocus(); 4747 4748 cancelTouchTarget(child); 4749 cancelHoverTarget(child); 4750 4751 if ((animate && child.getAnimation() != null) || 4752 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4753 addDisappearingView(child); 4754 } else if (child.mAttachInfo != null) { 4755 child.dispatchDetachedFromWindow(); 4756 } 4757 4758 if (child.hasTransientState()) { 4759 childHasTransientStateChanged(child, false); 4760 } 4761 4762 onViewRemoved(child); 4763 } 4764 4765 /** 4766 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4767 * sets the layout parameters and puts the view in the list of children so that 4768 * it can be retrieved by calling {@link #getChildAt(int)}. 4769 * <p> 4770 * This method is intended to be lightweight and makes no assumptions about whether the 4771 * parent or child should be redrawn. Proper use of this method will include also making 4772 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4773 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4774 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4775 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4776 * <p> 4777 * This method should be called only for views which were detached from their parent. 4778 * 4779 * @param child the child to attach 4780 * @param index the index at which the child should be attached 4781 * @param params the layout parameters of the child 4782 * 4783 * @see #removeDetachedView(View, boolean) 4784 * @see #detachAllViewsFromParent() 4785 * @see #detachViewFromParent(View) 4786 * @see #detachViewFromParent(int) 4787 */ 4788 protected void attachViewToParent(View child, int index, LayoutParams params) { 4789 child.mLayoutParams = params; 4790 4791 if (index < 0) { 4792 index = mChildrenCount; 4793 } 4794 4795 addInArray(child, index); 4796 4797 child.mParent = this; 4798 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4799 & ~PFLAG_DRAWING_CACHE_VALID) 4800 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4801 this.mPrivateFlags |= PFLAG_INVALIDATED; 4802 4803 if (child.hasFocus()) { 4804 requestChildFocus(child, child.findFocus()); 4805 } 4806 } 4807 4808 /** 4809 * Detaches a view from its parent. Detaching a view should be followed 4810 * either by a call to 4811 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4812 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4813 * temporary; reattachment or removal should happen within the same drawing cycle as 4814 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4815 * call to {@link #getChildAt(int)}. 4816 * 4817 * @param child the child to detach 4818 * 4819 * @see #detachViewFromParent(int) 4820 * @see #detachViewsFromParent(int, int) 4821 * @see #detachAllViewsFromParent() 4822 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4823 * @see #removeDetachedView(View, boolean) 4824 */ 4825 protected void detachViewFromParent(View child) { 4826 removeFromArray(indexOfChild(child)); 4827 } 4828 4829 /** 4830 * Detaches a view from its parent. Detaching a view should be followed 4831 * either by a call to 4832 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4833 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4834 * temporary; reattachment or removal should happen within the same drawing cycle as 4835 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4836 * call to {@link #getChildAt(int)}. 4837 * 4838 * @param index the index of the child to detach 4839 * 4840 * @see #detachViewFromParent(View) 4841 * @see #detachAllViewsFromParent() 4842 * @see #detachViewsFromParent(int, int) 4843 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4844 * @see #removeDetachedView(View, boolean) 4845 */ 4846 protected void detachViewFromParent(int index) { 4847 removeFromArray(index); 4848 } 4849 4850 /** 4851 * Detaches a range of views from their parents. Detaching a view should be followed 4852 * either by a call to 4853 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4854 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4855 * temporary; reattachment or removal should happen within the same drawing cycle as 4856 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4857 * call to {@link #getChildAt(int)}. 4858 * 4859 * @param start the first index of the childrend range to detach 4860 * @param count the number of children to detach 4861 * 4862 * @see #detachViewFromParent(View) 4863 * @see #detachViewFromParent(int) 4864 * @see #detachAllViewsFromParent() 4865 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4866 * @see #removeDetachedView(View, boolean) 4867 */ 4868 protected void detachViewsFromParent(int start, int count) { 4869 removeFromArray(start, count); 4870 } 4871 4872 /** 4873 * Detaches all views from the parent. Detaching a view should be followed 4874 * either by a call to 4875 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4876 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4877 * temporary; reattachment or removal should happen within the same drawing cycle as 4878 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4879 * call to {@link #getChildAt(int)}. 4880 * 4881 * @see #detachViewFromParent(View) 4882 * @see #detachViewFromParent(int) 4883 * @see #detachViewsFromParent(int, int) 4884 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4885 * @see #removeDetachedView(View, boolean) 4886 */ 4887 protected void detachAllViewsFromParent() { 4888 final int count = mChildrenCount; 4889 if (count <= 0) { 4890 return; 4891 } 4892 4893 final View[] children = mChildren; 4894 mChildrenCount = 0; 4895 4896 for (int i = count - 1; i >= 0; i--) { 4897 children[i].mParent = null; 4898 children[i] = null; 4899 } 4900 } 4901 4902 /** 4903 * Don't call or override this method. It is used for the implementation of 4904 * the view hierarchy. 4905 */ 4906 public final void invalidateChild(View child, final Rect dirty) { 4907 ViewParent parent = this; 4908 4909 final AttachInfo attachInfo = mAttachInfo; 4910 if (attachInfo != null) { 4911 // If the child is drawing an animation, we want to copy this flag onto 4912 // ourselves and the parent to make sure the invalidate request goes 4913 // through 4914 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4915 == PFLAG_DRAW_ANIMATION; 4916 4917 // Check whether the child that requests the invalidate is fully opaque 4918 // Views being animated or transformed are not considered opaque because we may 4919 // be invalidating their old position and need the parent to paint behind them. 4920 Matrix childMatrix = child.getMatrix(); 4921 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4922 child.getAnimation() == null && childMatrix.isIdentity(); 4923 // Mark the child as dirty, using the appropriate flag 4924 // Make sure we do not set both flags at the same time 4925 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4926 4927 if (child.mLayerType != LAYER_TYPE_NONE) { 4928 mPrivateFlags |= PFLAG_INVALIDATED; 4929 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4930 } 4931 4932 final int[] location = attachInfo.mInvalidateChildLocation; 4933 location[CHILD_LEFT_INDEX] = child.mLeft; 4934 location[CHILD_TOP_INDEX] = child.mTop; 4935 if (!childMatrix.isIdentity() || 4936 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4937 RectF boundingRect = attachInfo.mTmpTransformRect; 4938 boundingRect.set(dirty); 4939 Matrix transformMatrix; 4940 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4941 Transformation t = attachInfo.mTmpTransformation; 4942 boolean transformed = getChildStaticTransformation(child, t); 4943 if (transformed) { 4944 transformMatrix = attachInfo.mTmpMatrix; 4945 transformMatrix.set(t.getMatrix()); 4946 if (!childMatrix.isIdentity()) { 4947 transformMatrix.preConcat(childMatrix); 4948 } 4949 } else { 4950 transformMatrix = childMatrix; 4951 } 4952 } else { 4953 transformMatrix = childMatrix; 4954 } 4955 transformMatrix.mapRect(boundingRect); 4956 dirty.set((int) (boundingRect.left - 0.5f), 4957 (int) (boundingRect.top - 0.5f), 4958 (int) (boundingRect.right + 0.5f), 4959 (int) (boundingRect.bottom + 0.5f)); 4960 } 4961 4962 do { 4963 View view = null; 4964 if (parent instanceof View) { 4965 view = (View) parent; 4966 } 4967 4968 if (drawAnimation) { 4969 if (view != null) { 4970 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4971 } else if (parent instanceof ViewRootImpl) { 4972 ((ViewRootImpl) parent).mIsAnimating = true; 4973 } 4974 } 4975 4976 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4977 // flag coming from the child that initiated the invalidate 4978 if (view != null) { 4979 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4980 view.getSolidColor() == 0) { 4981 opaqueFlag = PFLAG_DIRTY; 4982 } 4983 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4984 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4985 } 4986 } 4987 4988 parent = parent.invalidateChildInParent(location, dirty); 4989 if (view != null) { 4990 // Account for transform on current parent 4991 Matrix m = view.getMatrix(); 4992 if (!m.isIdentity()) { 4993 RectF boundingRect = attachInfo.mTmpTransformRect; 4994 boundingRect.set(dirty); 4995 m.mapRect(boundingRect); 4996 dirty.set((int) (boundingRect.left - 0.5f), 4997 (int) (boundingRect.top - 0.5f), 4998 (int) (boundingRect.right + 0.5f), 4999 (int) (boundingRect.bottom + 0.5f)); 5000 } 5001 } 5002 } while (parent != null); 5003 } 5004 } 5005 5006 /** 5007 * Don't call or override this method. It is used for the implementation of 5008 * the view hierarchy. 5009 * 5010 * This implementation returns null if this ViewGroup does not have a parent, 5011 * if this ViewGroup is already fully invalidated or if the dirty rectangle 5012 * does not intersect with this ViewGroup's bounds. 5013 */ 5014 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 5015 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 5016 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 5017 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 5018 FLAG_OPTIMIZE_INVALIDATE) { 5019 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 5020 location[CHILD_TOP_INDEX] - mScrollY); 5021 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 5022 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5023 } 5024 5025 final int left = mLeft; 5026 final int top = mTop; 5027 5028 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 5029 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 5030 dirty.setEmpty(); 5031 } 5032 } 5033 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 5034 5035 location[CHILD_LEFT_INDEX] = left; 5036 location[CHILD_TOP_INDEX] = top; 5037 5038 if (mLayerType != LAYER_TYPE_NONE) { 5039 mPrivateFlags |= PFLAG_INVALIDATED; 5040 } 5041 5042 return mParent; 5043 5044 } else { 5045 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 5046 5047 location[CHILD_LEFT_INDEX] = mLeft; 5048 location[CHILD_TOP_INDEX] = mTop; 5049 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 5050 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 5051 } else { 5052 // in case the dirty rect extends outside the bounds of this container 5053 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5054 } 5055 5056 if (mLayerType != LAYER_TYPE_NONE) { 5057 mPrivateFlags |= PFLAG_INVALIDATED; 5058 } 5059 5060 return mParent; 5061 } 5062 } 5063 5064 return null; 5065 } 5066 5067 /** 5068 * Native-calculated damage path 5069 * Returns false if this path was unable to complete successfully. This means 5070 * it hit a ViewParent it doesn't recognize and needs to fall back to calculating 5071 * damage area 5072 * @hide 5073 */ 5074 public boolean damageChildDeferred(View child) { 5075 ViewParent parent = getParent(); 5076 while (parent != null) { 5077 if (parent instanceof ViewGroup) { 5078 parent = parent.getParent(); 5079 } else if (parent instanceof ViewRootImpl) { 5080 ((ViewRootImpl) parent).invalidate(); 5081 return true; 5082 } else { 5083 parent = null; 5084 } 5085 } 5086 return false; 5087 } 5088 5089 /** 5090 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 5091 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 5092 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 5093 * 5094 * @hide 5095 */ 5096 public void damageChild(View child, final Rect dirty) { 5097 if (damageChildDeferred(child)) { 5098 return; 5099 } 5100 5101 ViewParent parent = this; 5102 5103 final AttachInfo attachInfo = mAttachInfo; 5104 if (attachInfo != null) { 5105 int left = child.mLeft; 5106 int top = child.mTop; 5107 if (!child.getMatrix().isIdentity()) { 5108 child.transformRect(dirty); 5109 } 5110 5111 do { 5112 if (parent instanceof ViewGroup) { 5113 ViewGroup parentVG = (ViewGroup) parent; 5114 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 5115 // Layered parents should be recreated, not just re-issued 5116 parentVG.invalidate(); 5117 parent = null; 5118 } else { 5119 parent = parentVG.damageChildInParent(left, top, dirty); 5120 left = parentVG.mLeft; 5121 top = parentVG.mTop; 5122 } 5123 } else { 5124 // Reached the top; this calls into the usual invalidate method in 5125 // ViewRootImpl, which schedules a traversal 5126 final int[] location = attachInfo.mInvalidateChildLocation; 5127 location[0] = left; 5128 location[1] = top; 5129 parent = parent.invalidateChildInParent(location, dirty); 5130 } 5131 } while (parent != null); 5132 } 5133 } 5134 5135 /** 5136 * Quick invalidation method that simply transforms the dirty rect into the parent's 5137 * coordinate system, pruning the invalidation if the parent has already been invalidated. 5138 * 5139 * @hide 5140 */ 5141 protected ViewParent damageChildInParent(int left, int top, final Rect dirty) { 5142 if ((mPrivateFlags & PFLAG_DRAWN) != 0 5143 || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) != 0) { 5144 dirty.offset(left - mScrollX, top - mScrollY); 5145 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 5146 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 5147 } 5148 5149 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 5150 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 5151 5152 if (!getMatrix().isIdentity()) { 5153 transformRect(dirty); 5154 } 5155 5156 return mParent; 5157 } 5158 } 5159 5160 return null; 5161 } 5162 5163 /** 5164 * Offset a rectangle that is in a descendant's coordinate 5165 * space into our coordinate space. 5166 * @param descendant A descendant of this view 5167 * @param rect A rectangle defined in descendant's coordinate space. 5168 */ 5169 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 5170 offsetRectBetweenParentAndChild(descendant, rect, true, false); 5171 } 5172 5173 /** 5174 * Offset a rectangle that is in our coordinate space into an ancestor's 5175 * coordinate space. 5176 * @param descendant A descendant of this view 5177 * @param rect A rectangle defined in descendant's coordinate space. 5178 */ 5179 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 5180 offsetRectBetweenParentAndChild(descendant, rect, false, false); 5181 } 5182 5183 /** 5184 * Helper method that offsets a rect either from parent to descendant or 5185 * descendant to parent. 5186 */ 5187 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 5188 boolean offsetFromChildToParent, boolean clipToBounds) { 5189 5190 // already in the same coord system :) 5191 if (descendant == this) { 5192 return; 5193 } 5194 5195 ViewParent theParent = descendant.mParent; 5196 5197 // search and offset up to the parent 5198 while ((theParent != null) 5199 && (theParent instanceof View) 5200 && (theParent != this)) { 5201 5202 if (offsetFromChildToParent) { 5203 rect.offset(descendant.mLeft - descendant.mScrollX, 5204 descendant.mTop - descendant.mScrollY); 5205 if (clipToBounds) { 5206 View p = (View) theParent; 5207 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 5208 } 5209 } else { 5210 if (clipToBounds) { 5211 View p = (View) theParent; 5212 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 5213 } 5214 rect.offset(descendant.mScrollX - descendant.mLeft, 5215 descendant.mScrollY - descendant.mTop); 5216 } 5217 5218 descendant = (View) theParent; 5219 theParent = descendant.mParent; 5220 } 5221 5222 // now that we are up to this view, need to offset one more time 5223 // to get into our coordinate space 5224 if (theParent == this) { 5225 if (offsetFromChildToParent) { 5226 rect.offset(descendant.mLeft - descendant.mScrollX, 5227 descendant.mTop - descendant.mScrollY); 5228 } else { 5229 rect.offset(descendant.mScrollX - descendant.mLeft, 5230 descendant.mScrollY - descendant.mTop); 5231 } 5232 } else { 5233 throw new IllegalArgumentException("parameter must be a descendant of this view"); 5234 } 5235 } 5236 5237 /** 5238 * Offset the vertical location of all children of this view by the specified number of pixels. 5239 * 5240 * @param offset the number of pixels to offset 5241 * 5242 * @hide 5243 */ 5244 public void offsetChildrenTopAndBottom(int offset) { 5245 final int count = mChildrenCount; 5246 final View[] children = mChildren; 5247 boolean invalidate = false; 5248 5249 for (int i = 0; i < count; i++) { 5250 final View v = children[i]; 5251 v.mTop += offset; 5252 v.mBottom += offset; 5253 if (v.mRenderNode != null) { 5254 invalidate = true; 5255 v.mRenderNode.offsetTopAndBottom(offset); 5256 } 5257 } 5258 5259 if (invalidate) { 5260 invalidateViewProperty(false, false); 5261 } 5262 notifySubtreeAccessibilityStateChangedIfNeeded(); 5263 } 5264 5265 /** 5266 * {@inheritDoc} 5267 */ 5268 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 5269 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 5270 // but for some simple tests it can be useful. If we don't have attach info this 5271 // will allocate memory. 5272 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 5273 rect.set(r); 5274 5275 if (!child.hasIdentityMatrix()) { 5276 child.getMatrix().mapRect(rect); 5277 } 5278 5279 final int dx = child.mLeft - mScrollX; 5280 final int dy = child.mTop - mScrollY; 5281 5282 rect.offset(dx, dy); 5283 5284 if (offset != null) { 5285 if (!child.hasIdentityMatrix()) { 5286 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 5287 : new float[2]; 5288 position[0] = offset.x; 5289 position[1] = offset.y; 5290 child.getMatrix().mapPoints(position); 5291 offset.x = (int) (position[0] + 0.5f); 5292 offset.y = (int) (position[1] + 0.5f); 5293 } 5294 offset.x += dx; 5295 offset.y += dy; 5296 } 5297 5298 final int width = mRight - mLeft; 5299 final int height = mBottom - mTop; 5300 5301 boolean rectIsVisible = true; 5302 if (mParent == null || 5303 (mParent instanceof ViewGroup && ((ViewGroup) mParent).getClipChildren())) { 5304 // Clip to bounds. 5305 rectIsVisible = rect.intersect(0, 0, width, height); 5306 } 5307 5308 if (rectIsVisible && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 5309 // Clip to padding. 5310 rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop, 5311 width - mPaddingRight, height - mPaddingBottom); 5312 } 5313 5314 if (rectIsVisible && mClipBounds != null) { 5315 // Clip to clipBounds. 5316 rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right, 5317 mClipBounds.bottom); 5318 } 5319 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), (int) (rect.right + 0.5f), 5320 (int) (rect.bottom + 0.5f)); 5321 if (rectIsVisible && mParent != null) { 5322 rectIsVisible = mParent.getChildVisibleRect(this, r, offset); 5323 } 5324 return rectIsVisible; 5325 } 5326 5327 /** 5328 * {@inheritDoc} 5329 */ 5330 @Override 5331 public final void layout(int l, int t, int r, int b) { 5332 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 5333 if (mTransition != null) { 5334 mTransition.layoutChange(this); 5335 } 5336 super.layout(l, t, r, b); 5337 } else { 5338 // record the fact that we noop'd it; request layout when transition finishes 5339 mLayoutCalledWhileSuppressed = true; 5340 } 5341 } 5342 5343 /** 5344 * {@inheritDoc} 5345 */ 5346 @Override 5347 protected abstract void onLayout(boolean changed, 5348 int l, int t, int r, int b); 5349 5350 /** 5351 * Indicates whether the view group has the ability to animate its children 5352 * after the first layout. 5353 * 5354 * @return true if the children can be animated, false otherwise 5355 */ 5356 protected boolean canAnimate() { 5357 return mLayoutAnimationController != null; 5358 } 5359 5360 /** 5361 * Runs the layout animation. Calling this method triggers a relayout of 5362 * this view group. 5363 */ 5364 public void startLayoutAnimation() { 5365 if (mLayoutAnimationController != null) { 5366 mGroupFlags |= FLAG_RUN_ANIMATION; 5367 requestLayout(); 5368 } 5369 } 5370 5371 /** 5372 * Schedules the layout animation to be played after the next layout pass 5373 * of this view group. This can be used to restart the layout animation 5374 * when the content of the view group changes or when the activity is 5375 * paused and resumed. 5376 */ 5377 public void scheduleLayoutAnimation() { 5378 mGroupFlags |= FLAG_RUN_ANIMATION; 5379 } 5380 5381 /** 5382 * Sets the layout animation controller used to animate the group's 5383 * children after the first layout. 5384 * 5385 * @param controller the animation controller 5386 */ 5387 public void setLayoutAnimation(LayoutAnimationController controller) { 5388 mLayoutAnimationController = controller; 5389 if (mLayoutAnimationController != null) { 5390 mGroupFlags |= FLAG_RUN_ANIMATION; 5391 } 5392 } 5393 5394 /** 5395 * Returns the layout animation controller used to animate the group's 5396 * children. 5397 * 5398 * @return the current animation controller 5399 */ 5400 public LayoutAnimationController getLayoutAnimation() { 5401 return mLayoutAnimationController; 5402 } 5403 5404 /** 5405 * Indicates whether the children's drawing cache is used during a layout 5406 * animation. By default, the drawing cache is enabled but this will prevent 5407 * nested layout animations from working. To nest animations, you must disable 5408 * the cache. 5409 * 5410 * @return true if the animation cache is enabled, false otherwise 5411 * 5412 * @see #setAnimationCacheEnabled(boolean) 5413 * @see View#setDrawingCacheEnabled(boolean) 5414 * 5415 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5416 * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}. 5417 */ 5418 public boolean isAnimationCacheEnabled() { 5419 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 5420 } 5421 5422 /** 5423 * Enables or disables the children's drawing cache during a layout animation. 5424 * By default, the drawing cache is enabled but this will prevent nested 5425 * layout animations from working. To nest animations, you must disable the 5426 * cache. 5427 * 5428 * @param enabled true to enable the animation cache, false otherwise 5429 * 5430 * @see #isAnimationCacheEnabled() 5431 * @see View#setDrawingCacheEnabled(boolean) 5432 * 5433 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5434 * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}. 5435 */ 5436 public void setAnimationCacheEnabled(boolean enabled) { 5437 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 5438 } 5439 5440 /** 5441 * Indicates whether this ViewGroup will always try to draw its children using their 5442 * drawing cache. By default this property is enabled. 5443 * 5444 * @return true if the animation cache is enabled, false otherwise 5445 * 5446 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5447 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5448 * @see View#setDrawingCacheEnabled(boolean) 5449 * 5450 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5451 * Child views may no longer have their caching behavior disabled by parents. 5452 */ 5453 public boolean isAlwaysDrawnWithCacheEnabled() { 5454 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 5455 } 5456 5457 /** 5458 * Indicates whether this ViewGroup will always try to draw its children using their 5459 * drawing cache. This property can be set to true when the cache rendering is 5460 * slightly different from the children's normal rendering. Renderings can be different, 5461 * for instance, when the cache's quality is set to low. 5462 * 5463 * When this property is disabled, the ViewGroup will use the drawing cache of its 5464 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 5465 * when to start using the drawing cache and when to stop using it. 5466 * 5467 * @param always true to always draw with the drawing cache, false otherwise 5468 * 5469 * @see #isAlwaysDrawnWithCacheEnabled() 5470 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5471 * @see View#setDrawingCacheEnabled(boolean) 5472 * @see View#setDrawingCacheQuality(int) 5473 * 5474 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5475 * Child views may no longer have their caching behavior disabled by parents. 5476 */ 5477 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 5478 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 5479 } 5480 5481 /** 5482 * Indicates whether the ViewGroup is currently drawing its children using 5483 * their drawing cache. 5484 * 5485 * @return true if children should be drawn with their cache, false otherwise 5486 * 5487 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5488 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5489 * 5490 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5491 * Child views may no longer be forced to cache their rendering state by their parents. 5492 * Use {@link View#setLayerType(int, Paint)} on individual Views instead. 5493 */ 5494 protected boolean isChildrenDrawnWithCacheEnabled() { 5495 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 5496 } 5497 5498 /** 5499 * Tells the ViewGroup to draw its children using their drawing cache. This property 5500 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 5501 * will be used only if it has been enabled. 5502 * 5503 * Subclasses should call this method to start and stop using the drawing cache when 5504 * they perform performance sensitive operations, like scrolling or animating. 5505 * 5506 * @param enabled true if children should be drawn with their cache, false otherwise 5507 * 5508 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5509 * @see #isChildrenDrawnWithCacheEnabled() 5510 * 5511 * @deprecated As of {@link android.os.Build.VERSION_CODES#MNC}, this property is ignored. 5512 * Child views may no longer be forced to cache their rendering state by their parents. 5513 * Use {@link View#setLayerType(int, Paint)} on individual Views instead. 5514 */ 5515 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 5516 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 5517 } 5518 5519 /** 5520 * Indicates whether the ViewGroup is drawing its children in the order defined by 5521 * {@link #getChildDrawingOrder(int, int)}. 5522 * 5523 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 5524 * false otherwise 5525 * 5526 * @see #setChildrenDrawingOrderEnabled(boolean) 5527 * @see #getChildDrawingOrder(int, int) 5528 */ 5529 @ViewDebug.ExportedProperty(category = "drawing") 5530 protected boolean isChildrenDrawingOrderEnabled() { 5531 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 5532 } 5533 5534 /** 5535 * Tells the ViewGroup whether to draw its children in the order defined by the method 5536 * {@link #getChildDrawingOrder(int, int)}. 5537 * <p> 5538 * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)}, 5539 * will override custom child ordering done via this method. 5540 * 5541 * @param enabled true if the order of the children when drawing is determined by 5542 * {@link #getChildDrawingOrder(int, int)}, false otherwise 5543 * 5544 * @see #isChildrenDrawingOrderEnabled() 5545 * @see #getChildDrawingOrder(int, int) 5546 */ 5547 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 5548 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 5549 } 5550 5551 private boolean hasBooleanFlag(int flag) { 5552 return (mGroupFlags & flag) == flag; 5553 } 5554 5555 private void setBooleanFlag(int flag, boolean value) { 5556 if (value) { 5557 mGroupFlags |= flag; 5558 } else { 5559 mGroupFlags &= ~flag; 5560 } 5561 } 5562 5563 /** 5564 * Returns an integer indicating what types of drawing caches are kept in memory. 5565 * 5566 * @see #setPersistentDrawingCache(int) 5567 * @see #setAnimationCacheEnabled(boolean) 5568 * 5569 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 5570 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5571 * and {@link #PERSISTENT_ALL_CACHES} 5572 */ 5573 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 5574 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 5575 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 5576 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 5577 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 5578 }) 5579 public int getPersistentDrawingCache() { 5580 return mPersistentDrawingCache; 5581 } 5582 5583 /** 5584 * Indicates what types of drawing caches should be kept in memory after 5585 * they have been created. 5586 * 5587 * @see #getPersistentDrawingCache() 5588 * @see #setAnimationCacheEnabled(boolean) 5589 * 5590 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 5591 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5592 * and {@link #PERSISTENT_ALL_CACHES} 5593 */ 5594 public void setPersistentDrawingCache(int drawingCacheToKeep) { 5595 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 5596 } 5597 5598 private void setLayoutMode(int layoutMode, boolean explicitly) { 5599 mLayoutMode = layoutMode; 5600 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 5601 } 5602 5603 /** 5604 * Recursively traverse the view hierarchy, resetting the layoutMode of any 5605 * descendants that had inherited a different layoutMode from a previous parent. 5606 * Recursion terminates when a descendant's mode is: 5607 * <ul> 5608 * <li>Undefined</li> 5609 * <li>The same as the root node's</li> 5610 * <li>A mode that had been explicitly set</li> 5611 * <ul/> 5612 * The first two clauses are optimizations. 5613 * @param layoutModeOfRoot 5614 */ 5615 @Override 5616 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 5617 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 5618 mLayoutMode == layoutModeOfRoot || 5619 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 5620 return; 5621 } 5622 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 5623 5624 // apply recursively 5625 for (int i = 0, N = getChildCount(); i < N; i++) { 5626 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 5627 } 5628 } 5629 5630 /** 5631 * Returns the basis of alignment during layout operations on this ViewGroup: 5632 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5633 * <p> 5634 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 5635 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 5636 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 5637 * 5638 * @return the layout mode to use during layout operations 5639 * 5640 * @see #setLayoutMode(int) 5641 */ 5642 public int getLayoutMode() { 5643 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5644 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5645 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5646 setLayoutMode(inheritedLayoutMode, false); 5647 } 5648 return mLayoutMode; 5649 } 5650 5651 /** 5652 * Sets the basis of alignment during the layout of this ViewGroup. 5653 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5654 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5655 * 5656 * @param layoutMode the layout mode to use during layout operations 5657 * 5658 * @see #getLayoutMode() 5659 * @attr ref android.R.styleable#ViewGroup_layoutMode 5660 */ 5661 public void setLayoutMode(int layoutMode) { 5662 if (mLayoutMode != layoutMode) { 5663 invalidateInheritedLayoutMode(layoutMode); 5664 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5665 requestLayout(); 5666 } 5667 } 5668 5669 /** 5670 * Returns a new set of layout parameters based on the supplied attributes set. 5671 * 5672 * @param attrs the attributes to build the layout parameters from 5673 * 5674 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5675 * of its descendants 5676 */ 5677 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5678 return new LayoutParams(getContext(), attrs); 5679 } 5680 5681 /** 5682 * Returns a safe set of layout parameters based on the supplied layout params. 5683 * When a ViewGroup is passed a View whose layout params do not pass the test of 5684 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5685 * is invoked. This method should return a new set of layout params suitable for 5686 * this ViewGroup, possibly by copying the appropriate attributes from the 5687 * specified set of layout params. 5688 * 5689 * @param p The layout parameters to convert into a suitable set of layout parameters 5690 * for this ViewGroup. 5691 * 5692 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5693 * of its descendants 5694 */ 5695 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5696 return p; 5697 } 5698 5699 /** 5700 * Returns a set of default layout parameters. These parameters are requested 5701 * when the View passed to {@link #addView(View)} has no layout parameters 5702 * already set. If null is returned, an exception is thrown from addView. 5703 * 5704 * @return a set of default layout parameters or null 5705 */ 5706 protected LayoutParams generateDefaultLayoutParams() { 5707 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5708 } 5709 5710 /** 5711 * {@inheritDoc} 5712 */ 5713 @Override 5714 protected void debug(int depth) { 5715 super.debug(depth); 5716 String output; 5717 5718 if (mFocused != null) { 5719 output = debugIndent(depth); 5720 output += "mFocused"; 5721 Log.d(VIEW_LOG_TAG, output); 5722 } 5723 if (mChildrenCount != 0) { 5724 output = debugIndent(depth); 5725 output += "{"; 5726 Log.d(VIEW_LOG_TAG, output); 5727 } 5728 int count = mChildrenCount; 5729 for (int i = 0; i < count; i++) { 5730 View child = mChildren[i]; 5731 child.debug(depth + 1); 5732 } 5733 5734 if (mChildrenCount != 0) { 5735 output = debugIndent(depth); 5736 output += "}"; 5737 Log.d(VIEW_LOG_TAG, output); 5738 } 5739 } 5740 5741 /** 5742 * Returns the position in the group of the specified child view. 5743 * 5744 * @param child the view for which to get the position 5745 * @return a positive integer representing the position of the view in the 5746 * group, or -1 if the view does not exist in the group 5747 */ 5748 public int indexOfChild(View child) { 5749 final int count = mChildrenCount; 5750 final View[] children = mChildren; 5751 for (int i = 0; i < count; i++) { 5752 if (children[i] == child) { 5753 return i; 5754 } 5755 } 5756 return -1; 5757 } 5758 5759 /** 5760 * Returns the number of children in the group. 5761 * 5762 * @return a positive integer representing the number of children in 5763 * the group 5764 */ 5765 public int getChildCount() { 5766 return mChildrenCount; 5767 } 5768 5769 /** 5770 * Returns the view at the specified position in the group. 5771 * 5772 * @param index the position at which to get the view from 5773 * @return the view at the specified position or null if the position 5774 * does not exist within the group 5775 */ 5776 public View getChildAt(int index) { 5777 if (index < 0 || index >= mChildrenCount) { 5778 return null; 5779 } 5780 return mChildren[index]; 5781 } 5782 5783 /** 5784 * Ask all of the children of this view to measure themselves, taking into 5785 * account both the MeasureSpec requirements for this view and its padding. 5786 * We skip children that are in the GONE state The heavy lifting is done in 5787 * getChildMeasureSpec. 5788 * 5789 * @param widthMeasureSpec The width requirements for this view 5790 * @param heightMeasureSpec The height requirements for this view 5791 */ 5792 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5793 final int size = mChildrenCount; 5794 final View[] children = mChildren; 5795 for (int i = 0; i < size; ++i) { 5796 final View child = children[i]; 5797 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5798 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5799 } 5800 } 5801 } 5802 5803 /** 5804 * Ask one of the children of this view to measure itself, taking into 5805 * account both the MeasureSpec requirements for this view and its padding. 5806 * The heavy lifting is done in getChildMeasureSpec. 5807 * 5808 * @param child The child to measure 5809 * @param parentWidthMeasureSpec The width requirements for this view 5810 * @param parentHeightMeasureSpec The height requirements for this view 5811 */ 5812 protected void measureChild(View child, int parentWidthMeasureSpec, 5813 int parentHeightMeasureSpec) { 5814 final LayoutParams lp = child.getLayoutParams(); 5815 5816 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5817 mPaddingLeft + mPaddingRight, lp.width); 5818 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5819 mPaddingTop + mPaddingBottom, lp.height); 5820 5821 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5822 } 5823 5824 /** 5825 * Ask one of the children of this view to measure itself, taking into 5826 * account both the MeasureSpec requirements for this view and its padding 5827 * and margins. The child must have MarginLayoutParams The heavy lifting is 5828 * done in getChildMeasureSpec. 5829 * 5830 * @param child The child to measure 5831 * @param parentWidthMeasureSpec The width requirements for this view 5832 * @param widthUsed Extra space that has been used up by the parent 5833 * horizontally (possibly by other children of the parent) 5834 * @param parentHeightMeasureSpec The height requirements for this view 5835 * @param heightUsed Extra space that has been used up by the parent 5836 * vertically (possibly by other children of the parent) 5837 */ 5838 protected void measureChildWithMargins(View child, 5839 int parentWidthMeasureSpec, int widthUsed, 5840 int parentHeightMeasureSpec, int heightUsed) { 5841 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5842 5843 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5844 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5845 + widthUsed, lp.width); 5846 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5847 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5848 + heightUsed, lp.height); 5849 5850 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5851 } 5852 5853 /** 5854 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5855 * pass to a particular child. This method figures out the right MeasureSpec 5856 * for one dimension (height or width) of one child view. 5857 * 5858 * The goal is to combine information from our MeasureSpec with the 5859 * LayoutParams of the child to get the best possible results. For example, 5860 * if the this view knows its size (because its MeasureSpec has a mode of 5861 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5862 * to be the same size as the parent, the parent should ask the child to 5863 * layout given an exact size. 5864 * 5865 * @param spec The requirements for this view 5866 * @param padding The padding of this view for the current dimension and 5867 * margins, if applicable 5868 * @param childDimension How big the child wants to be in the current 5869 * dimension 5870 * @return a MeasureSpec integer for the child 5871 */ 5872 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5873 int specMode = MeasureSpec.getMode(spec); 5874 int specSize = MeasureSpec.getSize(spec); 5875 5876 int size = Math.max(0, specSize - padding); 5877 5878 int resultSize = 0; 5879 int resultMode = 0; 5880 5881 switch (specMode) { 5882 // Parent has imposed an exact size on us 5883 case MeasureSpec.EXACTLY: 5884 if (childDimension >= 0) { 5885 resultSize = childDimension; 5886 resultMode = MeasureSpec.EXACTLY; 5887 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5888 // Child wants to be our size. So be it. 5889 resultSize = size; 5890 resultMode = MeasureSpec.EXACTLY; 5891 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5892 // Child wants to determine its own size. It can't be 5893 // bigger than us. 5894 resultSize = size; 5895 resultMode = MeasureSpec.AT_MOST; 5896 } 5897 break; 5898 5899 // Parent has imposed a maximum size on us 5900 case MeasureSpec.AT_MOST: 5901 if (childDimension >= 0) { 5902 // Child wants a specific size... so be it 5903 resultSize = childDimension; 5904 resultMode = MeasureSpec.EXACTLY; 5905 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5906 // Child wants to be our size, but our size is not fixed. 5907 // Constrain child to not be bigger than us. 5908 resultSize = size; 5909 resultMode = MeasureSpec.AT_MOST; 5910 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5911 // Child wants to determine its own size. It can't be 5912 // bigger than us. 5913 resultSize = size; 5914 resultMode = MeasureSpec.AT_MOST; 5915 } 5916 break; 5917 5918 // Parent asked to see how big we want to be 5919 case MeasureSpec.UNSPECIFIED: 5920 if (childDimension >= 0) { 5921 // Child wants a specific size... let him have it 5922 resultSize = childDimension; 5923 resultMode = MeasureSpec.EXACTLY; 5924 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5925 // Child wants to be our size... find out how big it should 5926 // be 5927 resultSize = size; 5928 resultMode = MeasureSpec.UNSPECIFIED; 5929 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5930 // Child wants to determine its own size.... find out how 5931 // big it should be 5932 resultSize = size; 5933 resultMode = MeasureSpec.UNSPECIFIED; 5934 } 5935 break; 5936 } 5937 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5938 } 5939 5940 5941 /** 5942 * Removes any pending animations for views that have been removed. Call 5943 * this if you don't want animations for exiting views to stack up. 5944 */ 5945 public void clearDisappearingChildren() { 5946 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5947 if (disappearingChildren != null) { 5948 final int count = disappearingChildren.size(); 5949 for (int i = 0; i < count; i++) { 5950 final View view = disappearingChildren.get(i); 5951 if (view.mAttachInfo != null) { 5952 view.dispatchDetachedFromWindow(); 5953 } 5954 view.clearAnimation(); 5955 } 5956 disappearingChildren.clear(); 5957 invalidate(); 5958 } 5959 } 5960 5961 /** 5962 * Add a view which is removed from mChildren but still needs animation 5963 * 5964 * @param v View to add 5965 */ 5966 private void addDisappearingView(View v) { 5967 ArrayList<View> disappearingChildren = mDisappearingChildren; 5968 5969 if (disappearingChildren == null) { 5970 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5971 } 5972 5973 disappearingChildren.add(v); 5974 } 5975 5976 /** 5977 * Cleanup a view when its animation is done. This may mean removing it from 5978 * the list of disappearing views. 5979 * 5980 * @param view The view whose animation has finished 5981 * @param animation The animation, cannot be null 5982 */ 5983 void finishAnimatingView(final View view, Animation animation) { 5984 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5985 if (disappearingChildren != null) { 5986 if (disappearingChildren.contains(view)) { 5987 disappearingChildren.remove(view); 5988 5989 if (view.mAttachInfo != null) { 5990 view.dispatchDetachedFromWindow(); 5991 } 5992 5993 view.clearAnimation(); 5994 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5995 } 5996 } 5997 5998 if (animation != null && !animation.getFillAfter()) { 5999 view.clearAnimation(); 6000 } 6001 6002 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 6003 view.onAnimationEnd(); 6004 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 6005 // so we'd rather be safe than sorry 6006 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 6007 // Draw one more frame after the animation is done 6008 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 6009 } 6010 } 6011 6012 /** 6013 * Utility function called by View during invalidation to determine whether a view that 6014 * is invisible or gone should still be invalidated because it is being transitioned (and 6015 * therefore still needs to be drawn). 6016 */ 6017 boolean isViewTransitioning(View view) { 6018 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 6019 } 6020 6021 /** 6022 * This method tells the ViewGroup that the given View object, which should have this 6023 * ViewGroup as its parent, 6024 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 6025 * is removed from its parent. This allows animations, such as those used by 6026 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 6027 * the removal of views. A call to this method should always be accompanied by a later call 6028 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 6029 * so that the View finally gets removed. 6030 * 6031 * @param view The View object to be kept visible even if it gets removed from its parent. 6032 */ 6033 public void startViewTransition(View view) { 6034 if (view.mParent == this) { 6035 if (mTransitioningViews == null) { 6036 mTransitioningViews = new ArrayList<View>(); 6037 } 6038 mTransitioningViews.add(view); 6039 } 6040 } 6041 6042 /** 6043 * This method should always be called following an earlier call to 6044 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 6045 * and will no longer be displayed. Note that this method does not perform the functionality 6046 * of removing a view from its parent; it just discontinues the display of a View that 6047 * has previously been removed. 6048 * 6049 * @return view The View object that has been removed but is being kept around in the visible 6050 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 6051 */ 6052 public void endViewTransition(View view) { 6053 if (mTransitioningViews != null) { 6054 mTransitioningViews.remove(view); 6055 final ArrayList<View> disappearingChildren = mDisappearingChildren; 6056 if (disappearingChildren != null && disappearingChildren.contains(view)) { 6057 disappearingChildren.remove(view); 6058 if (mVisibilityChangingChildren != null && 6059 mVisibilityChangingChildren.contains(view)) { 6060 mVisibilityChangingChildren.remove(view); 6061 } else { 6062 if (view.mAttachInfo != null) { 6063 view.dispatchDetachedFromWindow(); 6064 } 6065 if (view.mParent != null) { 6066 view.mParent = null; 6067 } 6068 } 6069 invalidate(); 6070 } 6071 } 6072 } 6073 6074 private LayoutTransition.TransitionListener mLayoutTransitionListener = 6075 new LayoutTransition.TransitionListener() { 6076 @Override 6077 public void startTransition(LayoutTransition transition, ViewGroup container, 6078 View view, int transitionType) { 6079 // We only care about disappearing items, since we need special logic to keep 6080 // those items visible after they've been 'removed' 6081 if (transitionType == LayoutTransition.DISAPPEARING) { 6082 startViewTransition(view); 6083 } 6084 } 6085 6086 @Override 6087 public void endTransition(LayoutTransition transition, ViewGroup container, 6088 View view, int transitionType) { 6089 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 6090 requestLayout(); 6091 mLayoutCalledWhileSuppressed = false; 6092 } 6093 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 6094 endViewTransition(view); 6095 } 6096 } 6097 }; 6098 6099 /** 6100 * Tells this ViewGroup to suppress all layout() calls until layout 6101 * suppression is disabled with a later call to suppressLayout(false). 6102 * When layout suppression is disabled, a requestLayout() call is sent 6103 * if layout() was attempted while layout was being suppressed. 6104 * 6105 * @hide 6106 */ 6107 public void suppressLayout(boolean suppress) { 6108 mSuppressLayout = suppress; 6109 if (!suppress) { 6110 if (mLayoutCalledWhileSuppressed) { 6111 requestLayout(); 6112 mLayoutCalledWhileSuppressed = false; 6113 } 6114 } 6115 } 6116 6117 /** 6118 * Returns whether layout calls on this container are currently being 6119 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 6120 * 6121 * @return true if layout calls are currently suppressed, false otherwise. 6122 * 6123 * @hide 6124 */ 6125 public boolean isLayoutSuppressed() { 6126 return mSuppressLayout; 6127 } 6128 6129 /** 6130 * {@inheritDoc} 6131 */ 6132 @Override 6133 public boolean gatherTransparentRegion(Region region) { 6134 // If no transparent regions requested, we are always opaque. 6135 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 6136 if (meOpaque && region == null) { 6137 // The caller doesn't care about the region, so stop now. 6138 return true; 6139 } 6140 super.gatherTransparentRegion(region); 6141 final View[] children = mChildren; 6142 final int count = mChildrenCount; 6143 boolean noneOfTheChildrenAreTransparent = true; 6144 for (int i = 0; i < count; i++) { 6145 final View child = children[i]; 6146 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 6147 if (!child.gatherTransparentRegion(region)) { 6148 noneOfTheChildrenAreTransparent = false; 6149 } 6150 } 6151 } 6152 return meOpaque || noneOfTheChildrenAreTransparent; 6153 } 6154 6155 /** 6156 * {@inheritDoc} 6157 */ 6158 public void requestTransparentRegion(View child) { 6159 if (child != null) { 6160 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 6161 if (mParent != null) { 6162 mParent.requestTransparentRegion(this); 6163 } 6164 } 6165 } 6166 6167 @Override 6168 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 6169 insets = super.dispatchApplyWindowInsets(insets); 6170 if (!insets.isConsumed()) { 6171 final int count = getChildCount(); 6172 for (int i = 0; i < count; i++) { 6173 insets = getChildAt(i).dispatchApplyWindowInsets(insets); 6174 if (insets.isConsumed()) { 6175 break; 6176 } 6177 } 6178 } 6179 return insets; 6180 } 6181 6182 /** 6183 * Returns the animation listener to which layout animation events are 6184 * sent. 6185 * 6186 * @return an {@link android.view.animation.Animation.AnimationListener} 6187 */ 6188 public Animation.AnimationListener getLayoutAnimationListener() { 6189 return mAnimationListener; 6190 } 6191 6192 @Override 6193 protected void drawableStateChanged() { 6194 super.drawableStateChanged(); 6195 6196 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 6197 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6198 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 6199 + " child has duplicateParentState set to true"); 6200 } 6201 6202 final View[] children = mChildren; 6203 final int count = mChildrenCount; 6204 6205 for (int i = 0; i < count; i++) { 6206 final View child = children[i]; 6207 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 6208 child.refreshDrawableState(); 6209 } 6210 } 6211 } 6212 } 6213 6214 @Override 6215 public void jumpDrawablesToCurrentState() { 6216 super.jumpDrawablesToCurrentState(); 6217 final View[] children = mChildren; 6218 final int count = mChildrenCount; 6219 for (int i = 0; i < count; i++) { 6220 children[i].jumpDrawablesToCurrentState(); 6221 } 6222 } 6223 6224 @Override 6225 protected int[] onCreateDrawableState(int extraSpace) { 6226 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 6227 return super.onCreateDrawableState(extraSpace); 6228 } 6229 6230 int need = 0; 6231 int n = getChildCount(); 6232 for (int i = 0; i < n; i++) { 6233 int[] childState = getChildAt(i).getDrawableState(); 6234 6235 if (childState != null) { 6236 need += childState.length; 6237 } 6238 } 6239 6240 int[] state = super.onCreateDrawableState(extraSpace + need); 6241 6242 for (int i = 0; i < n; i++) { 6243 int[] childState = getChildAt(i).getDrawableState(); 6244 6245 if (childState != null) { 6246 state = mergeDrawableStates(state, childState); 6247 } 6248 } 6249 6250 return state; 6251 } 6252 6253 /** 6254 * Sets whether this ViewGroup's drawable states also include 6255 * its children's drawable states. This is used, for example, to 6256 * make a group appear to be focused when its child EditText or button 6257 * is focused. 6258 */ 6259 public void setAddStatesFromChildren(boolean addsStates) { 6260 if (addsStates) { 6261 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 6262 } else { 6263 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 6264 } 6265 6266 refreshDrawableState(); 6267 } 6268 6269 /** 6270 * Returns whether this ViewGroup's drawable states also include 6271 * its children's drawable states. This is used, for example, to 6272 * make a group appear to be focused when its child EditText or button 6273 * is focused. 6274 */ 6275 public boolean addStatesFromChildren() { 6276 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 6277 } 6278 6279 /** 6280 * If {@link #addStatesFromChildren} is true, refreshes this group's 6281 * drawable state (to include the states from its children). 6282 */ 6283 public void childDrawableStateChanged(View child) { 6284 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6285 refreshDrawableState(); 6286 } 6287 } 6288 6289 /** 6290 * Specifies the animation listener to which layout animation events must 6291 * be sent. Only 6292 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 6293 * and 6294 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 6295 * are invoked. 6296 * 6297 * @param animationListener the layout animation listener 6298 */ 6299 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 6300 mAnimationListener = animationListener; 6301 } 6302 6303 /** 6304 * This method is called by LayoutTransition when there are 'changing' animations that need 6305 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 6306 * starts all pending transitions prior to the drawing phase in the current traversal. 6307 * 6308 * @param transition The LayoutTransition to be started on the next traversal. 6309 * 6310 * @hide 6311 */ 6312 public void requestTransitionStart(LayoutTransition transition) { 6313 ViewRootImpl viewAncestor = getViewRootImpl(); 6314 if (viewAncestor != null) { 6315 viewAncestor.requestTransitionStart(transition); 6316 } 6317 } 6318 6319 /** 6320 * @hide 6321 */ 6322 @Override 6323 public boolean resolveRtlPropertiesIfNeeded() { 6324 final boolean result = super.resolveRtlPropertiesIfNeeded(); 6325 // We dont need to resolve the children RTL properties if nothing has changed for the parent 6326 if (result) { 6327 int count = getChildCount(); 6328 for (int i = 0; i < count; i++) { 6329 final View child = getChildAt(i); 6330 if (child.isLayoutDirectionInherited()) { 6331 child.resolveRtlPropertiesIfNeeded(); 6332 } 6333 } 6334 } 6335 return result; 6336 } 6337 6338 /** 6339 * @hide 6340 */ 6341 @Override 6342 public boolean resolveLayoutDirection() { 6343 final boolean result = super.resolveLayoutDirection(); 6344 if (result) { 6345 int count = getChildCount(); 6346 for (int i = 0; i < count; i++) { 6347 final View child = getChildAt(i); 6348 if (child.isLayoutDirectionInherited()) { 6349 child.resolveLayoutDirection(); 6350 } 6351 } 6352 } 6353 return result; 6354 } 6355 6356 /** 6357 * @hide 6358 */ 6359 @Override 6360 public boolean resolveTextDirection() { 6361 final boolean result = super.resolveTextDirection(); 6362 if (result) { 6363 int count = getChildCount(); 6364 for (int i = 0; i < count; i++) { 6365 final View child = getChildAt(i); 6366 if (child.isTextDirectionInherited()) { 6367 child.resolveTextDirection(); 6368 } 6369 } 6370 } 6371 return result; 6372 } 6373 6374 /** 6375 * @hide 6376 */ 6377 @Override 6378 public boolean resolveTextAlignment() { 6379 final boolean result = super.resolveTextAlignment(); 6380 if (result) { 6381 int count = getChildCount(); 6382 for (int i = 0; i < count; i++) { 6383 final View child = getChildAt(i); 6384 if (child.isTextAlignmentInherited()) { 6385 child.resolveTextAlignment(); 6386 } 6387 } 6388 } 6389 return result; 6390 } 6391 6392 /** 6393 * @hide 6394 */ 6395 @Override 6396 public void resolvePadding() { 6397 super.resolvePadding(); 6398 int count = getChildCount(); 6399 for (int i = 0; i < count; i++) { 6400 final View child = getChildAt(i); 6401 if (child.isLayoutDirectionInherited() && !child.isPaddingResolved()) { 6402 child.resolvePadding(); 6403 } 6404 } 6405 } 6406 6407 /** 6408 * @hide 6409 */ 6410 @Override 6411 protected void resolveDrawables() { 6412 super.resolveDrawables(); 6413 int count = getChildCount(); 6414 for (int i = 0; i < count; i++) { 6415 final View child = getChildAt(i); 6416 if (child.isLayoutDirectionInherited() && !child.areDrawablesResolved()) { 6417 child.resolveDrawables(); 6418 } 6419 } 6420 } 6421 6422 /** 6423 * @hide 6424 */ 6425 @Override 6426 public void resolveLayoutParams() { 6427 super.resolveLayoutParams(); 6428 int count = getChildCount(); 6429 for (int i = 0; i < count; i++) { 6430 final View child = getChildAt(i); 6431 child.resolveLayoutParams(); 6432 } 6433 } 6434 6435 /** 6436 * @hide 6437 */ 6438 @Override 6439 public void resetResolvedLayoutDirection() { 6440 super.resetResolvedLayoutDirection(); 6441 6442 int count = getChildCount(); 6443 for (int i = 0; i < count; i++) { 6444 final View child = getChildAt(i); 6445 if (child.isLayoutDirectionInherited()) { 6446 child.resetResolvedLayoutDirection(); 6447 } 6448 } 6449 } 6450 6451 /** 6452 * @hide 6453 */ 6454 @Override 6455 public void resetResolvedTextDirection() { 6456 super.resetResolvedTextDirection(); 6457 6458 int count = getChildCount(); 6459 for (int i = 0; i < count; i++) { 6460 final View child = getChildAt(i); 6461 if (child.isTextDirectionInherited()) { 6462 child.resetResolvedTextDirection(); 6463 } 6464 } 6465 } 6466 6467 /** 6468 * @hide 6469 */ 6470 @Override 6471 public void resetResolvedTextAlignment() { 6472 super.resetResolvedTextAlignment(); 6473 6474 int count = getChildCount(); 6475 for (int i = 0; i < count; i++) { 6476 final View child = getChildAt(i); 6477 if (child.isTextAlignmentInherited()) { 6478 child.resetResolvedTextAlignment(); 6479 } 6480 } 6481 } 6482 6483 /** 6484 * @hide 6485 */ 6486 @Override 6487 public void resetResolvedPadding() { 6488 super.resetResolvedPadding(); 6489 6490 int count = getChildCount(); 6491 for (int i = 0; i < count; i++) { 6492 final View child = getChildAt(i); 6493 if (child.isLayoutDirectionInherited()) { 6494 child.resetResolvedPadding(); 6495 } 6496 } 6497 } 6498 6499 /** 6500 * @hide 6501 */ 6502 @Override 6503 protected void resetResolvedDrawables() { 6504 super.resetResolvedDrawables(); 6505 6506 int count = getChildCount(); 6507 for (int i = 0; i < count; i++) { 6508 final View child = getChildAt(i); 6509 if (child.isLayoutDirectionInherited()) { 6510 child.resetResolvedDrawables(); 6511 } 6512 } 6513 } 6514 6515 /** 6516 * Return true if the pressed state should be delayed for children or descendants of this 6517 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 6518 * This prevents the pressed state from appearing when the user is actually trying to scroll 6519 * the content. 6520 * 6521 * The default implementation returns true for compatibility reasons. Subclasses that do 6522 * not scroll should generally override this method and return false. 6523 */ 6524 public boolean shouldDelayChildPressedState() { 6525 return true; 6526 } 6527 6528 /** 6529 * @inheritDoc 6530 */ 6531 @Override 6532 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 6533 return false; 6534 } 6535 6536 /** 6537 * @inheritDoc 6538 */ 6539 @Override 6540 public void onNestedScrollAccepted(View child, View target, int axes) { 6541 mNestedScrollAxes = axes; 6542 } 6543 6544 /** 6545 * @inheritDoc 6546 * 6547 * <p>The default implementation of onStopNestedScroll calls 6548 * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p> 6549 */ 6550 @Override 6551 public void onStopNestedScroll(View child) { 6552 // Stop any recursive nested scrolling. 6553 stopNestedScroll(); 6554 mNestedScrollAxes = 0; 6555 } 6556 6557 /** 6558 * @inheritDoc 6559 */ 6560 @Override 6561 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 6562 int dxUnconsumed, int dyUnconsumed) { 6563 // Do nothing 6564 } 6565 6566 /** 6567 * @inheritDoc 6568 */ 6569 @Override 6570 public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 6571 // Do nothing 6572 } 6573 6574 /** 6575 * @inheritDoc 6576 */ 6577 @Override 6578 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 6579 return false; 6580 } 6581 6582 /** 6583 * @inheritDoc 6584 */ 6585 @Override 6586 public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 6587 return false; 6588 } 6589 6590 /** 6591 * Return the current axes of nested scrolling for this ViewGroup. 6592 * 6593 * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently 6594 * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p> 6595 * 6596 * @return Flags indicating the current axes of nested scrolling 6597 * @see #SCROLL_AXIS_HORIZONTAL 6598 * @see #SCROLL_AXIS_VERTICAL 6599 * @see #SCROLL_AXIS_NONE 6600 */ 6601 public int getNestedScrollAxes() { 6602 return mNestedScrollAxes; 6603 } 6604 6605 /** @hide */ 6606 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 6607 } 6608 6609 /** @hide */ 6610 @Override 6611 public void captureTransitioningViews(List<View> transitioningViews) { 6612 if (getVisibility() != View.VISIBLE) { 6613 return; 6614 } 6615 if (isTransitionGroup()) { 6616 transitioningViews.add(this); 6617 } else { 6618 int count = getChildCount(); 6619 for (int i = 0; i < count; i++) { 6620 View child = getChildAt(i); 6621 child.captureTransitioningViews(transitioningViews); 6622 } 6623 } 6624 } 6625 6626 /** @hide */ 6627 @Override 6628 public void findNamedViews(Map<String, View> namedElements) { 6629 if (getVisibility() != VISIBLE && mGhostView == null) { 6630 return; 6631 } 6632 super.findNamedViews(namedElements); 6633 int count = getChildCount(); 6634 for (int i = 0; i < count; i++) { 6635 View child = getChildAt(i); 6636 child.findNamedViews(namedElements); 6637 } 6638 } 6639 6640 /** 6641 * LayoutParams are used by views to tell their parents how they want to be 6642 * laid out. See 6643 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 6644 * for a list of all child view attributes that this class supports. 6645 * 6646 * <p> 6647 * The base LayoutParams class just describes how big the view wants to be 6648 * for both width and height. For each dimension, it can specify one of: 6649 * <ul> 6650 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 6651 * means that the view wants to be as big as its parent (minus padding) 6652 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 6653 * to enclose its content (plus padding) 6654 * <li> an exact number 6655 * </ul> 6656 * There are subclasses of LayoutParams for different subclasses of 6657 * ViewGroup. For example, AbsoluteLayout has its own subclass of 6658 * LayoutParams which adds an X and Y value.</p> 6659 * 6660 * <div class="special reference"> 6661 * <h3>Developer Guides</h3> 6662 * <p>For more information about creating user interface layouts, read the 6663 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 6664 * guide.</p></div> 6665 * 6666 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 6667 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 6668 */ 6669 public static class LayoutParams { 6670 /** 6671 * Special value for the height or width requested by a View. 6672 * FILL_PARENT means that the view wants to be as big as its parent, 6673 * minus the parent's padding, if any. This value is deprecated 6674 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 6675 */ 6676 @SuppressWarnings({"UnusedDeclaration"}) 6677 @Deprecated 6678 public static final int FILL_PARENT = -1; 6679 6680 /** 6681 * Special value for the height or width requested by a View. 6682 * MATCH_PARENT means that the view wants to be as big as its parent, 6683 * minus the parent's padding, if any. Introduced in API Level 8. 6684 */ 6685 public static final int MATCH_PARENT = -1; 6686 6687 /** 6688 * Special value for the height or width requested by a View. 6689 * WRAP_CONTENT means that the view wants to be just large enough to fit 6690 * its own internal content, taking its own padding into account. 6691 */ 6692 public static final int WRAP_CONTENT = -2; 6693 6694 /** 6695 * Information about how wide the view wants to be. Can be one of the 6696 * constants FILL_PARENT (replaced by MATCH_PARENT 6697 * in API Level 8) or WRAP_CONTENT, or an exact size. 6698 */ 6699 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6700 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6701 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6702 }) 6703 public int width; 6704 6705 /** 6706 * Information about how tall the view wants to be. Can be one of the 6707 * constants FILL_PARENT (replaced by MATCH_PARENT 6708 * in API Level 8) or WRAP_CONTENT, or an exact size. 6709 */ 6710 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6711 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6712 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6713 }) 6714 public int height; 6715 6716 /** 6717 * Used to animate layouts. 6718 */ 6719 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 6720 6721 /** 6722 * Creates a new set of layout parameters. The values are extracted from 6723 * the supplied attributes set and context. The XML attributes mapped 6724 * to this set of layout parameters are: 6725 * 6726 * <ul> 6727 * <li><code>layout_width</code>: the width, either an exact value, 6728 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6729 * {@link #MATCH_PARENT} in API Level 8)</li> 6730 * <li><code>layout_height</code>: the height, either an exact value, 6731 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6732 * {@link #MATCH_PARENT} in API Level 8)</li> 6733 * </ul> 6734 * 6735 * @param c the application environment 6736 * @param attrs the set of attributes from which to extract the layout 6737 * parameters' values 6738 */ 6739 public LayoutParams(Context c, AttributeSet attrs) { 6740 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 6741 setBaseAttributes(a, 6742 R.styleable.ViewGroup_Layout_layout_width, 6743 R.styleable.ViewGroup_Layout_layout_height); 6744 a.recycle(); 6745 } 6746 6747 /** 6748 * Creates a new set of layout parameters with the specified width 6749 * and height. 6750 * 6751 * @param width the width, either {@link #WRAP_CONTENT}, 6752 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6753 * API Level 8), or a fixed size in pixels 6754 * @param height the height, either {@link #WRAP_CONTENT}, 6755 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6756 * API Level 8), or a fixed size in pixels 6757 */ 6758 public LayoutParams(int width, int height) { 6759 this.width = width; 6760 this.height = height; 6761 } 6762 6763 /** 6764 * Copy constructor. Clones the width and height values of the source. 6765 * 6766 * @param source The layout params to copy from. 6767 */ 6768 public LayoutParams(LayoutParams source) { 6769 this.width = source.width; 6770 this.height = source.height; 6771 } 6772 6773 /** 6774 * Used internally by MarginLayoutParams. 6775 * @hide 6776 */ 6777 LayoutParams() { 6778 } 6779 6780 /** 6781 * Extracts the layout parameters from the supplied attributes. 6782 * 6783 * @param a the style attributes to extract the parameters from 6784 * @param widthAttr the identifier of the width attribute 6785 * @param heightAttr the identifier of the height attribute 6786 */ 6787 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6788 width = a.getLayoutDimension(widthAttr, "layout_width"); 6789 height = a.getLayoutDimension(heightAttr, "layout_height"); 6790 } 6791 6792 /** 6793 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6794 * layoutDirection changes should override this method. The default implementation does 6795 * nothing. 6796 * 6797 * @param layoutDirection the direction of the layout 6798 * 6799 * {@link View#LAYOUT_DIRECTION_LTR} 6800 * {@link View#LAYOUT_DIRECTION_RTL} 6801 */ 6802 public void resolveLayoutDirection(int layoutDirection) { 6803 } 6804 6805 /** 6806 * Returns a String representation of this set of layout parameters. 6807 * 6808 * @param output the String to prepend to the internal representation 6809 * @return a String with the following format: output + 6810 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6811 * 6812 * @hide 6813 */ 6814 public String debug(String output) { 6815 return output + "ViewGroup.LayoutParams={ width=" 6816 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6817 } 6818 6819 /** 6820 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6821 * 6822 * @param view the view that contains these layout parameters 6823 * @param canvas the canvas on which to draw 6824 * 6825 * @hide 6826 */ 6827 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6828 } 6829 6830 /** 6831 * Converts the specified size to a readable String. 6832 * 6833 * @param size the size to convert 6834 * @return a String instance representing the supplied size 6835 * 6836 * @hide 6837 */ 6838 protected static String sizeToString(int size) { 6839 if (size == WRAP_CONTENT) { 6840 return "wrap-content"; 6841 } 6842 if (size == MATCH_PARENT) { 6843 return "match-parent"; 6844 } 6845 return String.valueOf(size); 6846 } 6847 } 6848 6849 /** 6850 * Per-child layout information for layouts that support margins. 6851 * See 6852 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6853 * for a list of all child view attributes that this class supports. 6854 */ 6855 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6856 /** 6857 * The left margin in pixels of the child. Margin values should be positive. 6858 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6859 * to this field. 6860 */ 6861 @ViewDebug.ExportedProperty(category = "layout") 6862 public int leftMargin; 6863 6864 /** 6865 * The top margin in pixels of the child. Margin values should be positive. 6866 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6867 * to this field. 6868 */ 6869 @ViewDebug.ExportedProperty(category = "layout") 6870 public int topMargin; 6871 6872 /** 6873 * The right margin in pixels of the child. Margin values should be positive. 6874 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6875 * to this field. 6876 */ 6877 @ViewDebug.ExportedProperty(category = "layout") 6878 public int rightMargin; 6879 6880 /** 6881 * The bottom margin in pixels of the child. Margin values should be positive. 6882 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6883 * to this field. 6884 */ 6885 @ViewDebug.ExportedProperty(category = "layout") 6886 public int bottomMargin; 6887 6888 /** 6889 * The start margin in pixels of the child. Margin values should be positive. 6890 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6891 * to this field. 6892 */ 6893 @ViewDebug.ExportedProperty(category = "layout") 6894 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6895 6896 /** 6897 * The end margin in pixels of the child. Margin values should be positive. 6898 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6899 * to this field. 6900 */ 6901 @ViewDebug.ExportedProperty(category = "layout") 6902 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6903 6904 /** 6905 * The default start and end margin. 6906 * @hide 6907 */ 6908 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6909 6910 /** 6911 * Bit 0: layout direction 6912 * Bit 1: layout direction 6913 * Bit 2: left margin undefined 6914 * Bit 3: right margin undefined 6915 * Bit 4: is RTL compatibility mode 6916 * Bit 5: need resolution 6917 * 6918 * Bit 6 to 7 not used 6919 * 6920 * @hide 6921 */ 6922 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6923 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6924 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6925 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6926 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6927 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6928 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6929 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6930 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6931 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6932 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6933 }, formatToHexString = true) 6934 byte mMarginFlags; 6935 6936 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6937 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6938 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6939 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6940 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6941 6942 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6943 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6944 6945 /** 6946 * Creates a new set of layout parameters. The values are extracted from 6947 * the supplied attributes set and context. 6948 * 6949 * @param c the application environment 6950 * @param attrs the set of attributes from which to extract the layout 6951 * parameters' values 6952 */ 6953 public MarginLayoutParams(Context c, AttributeSet attrs) { 6954 super(); 6955 6956 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6957 setBaseAttributes(a, 6958 R.styleable.ViewGroup_MarginLayout_layout_width, 6959 R.styleable.ViewGroup_MarginLayout_layout_height); 6960 6961 int margin = a.getDimensionPixelSize( 6962 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6963 if (margin >= 0) { 6964 leftMargin = margin; 6965 topMargin = margin; 6966 rightMargin= margin; 6967 bottomMargin = margin; 6968 } else { 6969 leftMargin = a.getDimensionPixelSize( 6970 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6971 UNDEFINED_MARGIN); 6972 if (leftMargin == UNDEFINED_MARGIN) { 6973 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6974 leftMargin = DEFAULT_MARGIN_RESOLVED; 6975 } 6976 rightMargin = a.getDimensionPixelSize( 6977 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6978 UNDEFINED_MARGIN); 6979 if (rightMargin == UNDEFINED_MARGIN) { 6980 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6981 rightMargin = DEFAULT_MARGIN_RESOLVED; 6982 } 6983 6984 topMargin = a.getDimensionPixelSize( 6985 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6986 DEFAULT_MARGIN_RESOLVED); 6987 bottomMargin = a.getDimensionPixelSize( 6988 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6989 DEFAULT_MARGIN_RESOLVED); 6990 6991 startMargin = a.getDimensionPixelSize( 6992 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6993 DEFAULT_MARGIN_RELATIVE); 6994 endMargin = a.getDimensionPixelSize( 6995 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6996 DEFAULT_MARGIN_RELATIVE); 6997 6998 if (isMarginRelative()) { 6999 mMarginFlags |= NEED_RESOLUTION_MASK; 7000 } 7001 } 7002 7003 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 7004 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 7005 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 7006 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 7007 } 7008 7009 // Layout direction is LTR by default 7010 mMarginFlags |= LAYOUT_DIRECTION_LTR; 7011 7012 a.recycle(); 7013 } 7014 7015 /** 7016 * {@inheritDoc} 7017 */ 7018 public MarginLayoutParams(int width, int height) { 7019 super(width, height); 7020 7021 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 7022 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 7023 7024 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7025 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 7026 } 7027 7028 /** 7029 * Copy constructor. Clones the width, height and margin values of the source. 7030 * 7031 * @param source The layout params to copy from. 7032 */ 7033 public MarginLayoutParams(MarginLayoutParams source) { 7034 this.width = source.width; 7035 this.height = source.height; 7036 7037 this.leftMargin = source.leftMargin; 7038 this.topMargin = source.topMargin; 7039 this.rightMargin = source.rightMargin; 7040 this.bottomMargin = source.bottomMargin; 7041 this.startMargin = source.startMargin; 7042 this.endMargin = source.endMargin; 7043 7044 this.mMarginFlags = source.mMarginFlags; 7045 } 7046 7047 /** 7048 * {@inheritDoc} 7049 */ 7050 public MarginLayoutParams(LayoutParams source) { 7051 super(source); 7052 7053 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 7054 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 7055 7056 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7057 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 7058 } 7059 7060 /** 7061 * @hide Used internally. 7062 */ 7063 public final void copyMarginsFrom(MarginLayoutParams source) { 7064 this.leftMargin = source.leftMargin; 7065 this.topMargin = source.topMargin; 7066 this.rightMargin = source.rightMargin; 7067 this.bottomMargin = source.bottomMargin; 7068 this.startMargin = source.startMargin; 7069 this.endMargin = source.endMargin; 7070 7071 this.mMarginFlags = source.mMarginFlags; 7072 } 7073 7074 /** 7075 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 7076 * to be done so that the new margins are taken into account. Left and right margins may be 7077 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 7078 * Margin values should be positive. 7079 * 7080 * @param left the left margin size 7081 * @param top the top margin size 7082 * @param right the right margin size 7083 * @param bottom the bottom margin size 7084 * 7085 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 7086 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 7087 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 7088 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 7089 */ 7090 public void setMargins(int left, int top, int right, int bottom) { 7091 leftMargin = left; 7092 topMargin = top; 7093 rightMargin = right; 7094 bottomMargin = bottom; 7095 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 7096 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 7097 if (isMarginRelative()) { 7098 mMarginFlags |= NEED_RESOLUTION_MASK; 7099 } else { 7100 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7101 } 7102 } 7103 7104 /** 7105 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 7106 * needs to be done so that the new relative margins are taken into account. Left and right 7107 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 7108 * direction. Margin values should be positive. 7109 * 7110 * @param start the start margin size 7111 * @param top the top margin size 7112 * @param end the right margin size 7113 * @param bottom the bottom margin size 7114 * 7115 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7116 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 7117 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7118 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 7119 * 7120 * @hide 7121 */ 7122 public void setMarginsRelative(int start, int top, int end, int bottom) { 7123 startMargin = start; 7124 topMargin = top; 7125 endMargin = end; 7126 bottomMargin = bottom; 7127 mMarginFlags |= NEED_RESOLUTION_MASK; 7128 } 7129 7130 /** 7131 * Sets the relative start margin. Margin values should be positive. 7132 * 7133 * @param start the start margin size 7134 * 7135 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7136 */ 7137 public void setMarginStart(int start) { 7138 startMargin = start; 7139 mMarginFlags |= NEED_RESOLUTION_MASK; 7140 } 7141 7142 /** 7143 * Returns the start margin in pixels. 7144 * 7145 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7146 * 7147 * @return the start margin in pixels. 7148 */ 7149 public int getMarginStart() { 7150 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 7151 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 7152 doResolveMargins(); 7153 } 7154 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7155 case View.LAYOUT_DIRECTION_RTL: 7156 return rightMargin; 7157 case View.LAYOUT_DIRECTION_LTR: 7158 default: 7159 return leftMargin; 7160 } 7161 } 7162 7163 /** 7164 * Sets the relative end margin. Margin values should be positive. 7165 * 7166 * @param end the end margin size 7167 * 7168 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7169 */ 7170 public void setMarginEnd(int end) { 7171 endMargin = end; 7172 mMarginFlags |= NEED_RESOLUTION_MASK; 7173 } 7174 7175 /** 7176 * Returns the end margin in pixels. 7177 * 7178 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7179 * 7180 * @return the end margin in pixels. 7181 */ 7182 public int getMarginEnd() { 7183 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 7184 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 7185 doResolveMargins(); 7186 } 7187 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7188 case View.LAYOUT_DIRECTION_RTL: 7189 return leftMargin; 7190 case View.LAYOUT_DIRECTION_LTR: 7191 default: 7192 return rightMargin; 7193 } 7194 } 7195 7196 /** 7197 * Check if margins are relative. 7198 * 7199 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7200 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7201 * 7202 * @return true if either marginStart or marginEnd has been set. 7203 */ 7204 public boolean isMarginRelative() { 7205 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 7206 } 7207 7208 /** 7209 * Set the layout direction 7210 * @param layoutDirection the layout direction. 7211 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 7212 * or {@link View#LAYOUT_DIRECTION_RTL}. 7213 */ 7214 public void setLayoutDirection(int layoutDirection) { 7215 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 7216 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 7217 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 7218 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 7219 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 7220 if (isMarginRelative()) { 7221 mMarginFlags |= NEED_RESOLUTION_MASK; 7222 } else { 7223 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7224 } 7225 } 7226 } 7227 7228 /** 7229 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 7230 * {@link View#LAYOUT_DIRECTION_RTL}. 7231 * 7232 * @return the layout direction. 7233 */ 7234 public int getLayoutDirection() { 7235 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 7236 } 7237 7238 /** 7239 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 7240 * may be overridden depending on layout direction. 7241 */ 7242 @Override 7243 public void resolveLayoutDirection(int layoutDirection) { 7244 setLayoutDirection(layoutDirection); 7245 7246 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 7247 // Will use the left and right margins if no relative margin is defined. 7248 if (!isMarginRelative() || 7249 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 7250 7251 // Proceed with resolution 7252 doResolveMargins(); 7253 } 7254 7255 private void doResolveMargins() { 7256 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 7257 // if left or right margins are not defined and if we have some start or end margin 7258 // defined then use those start and end margins. 7259 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 7260 && startMargin > DEFAULT_MARGIN_RELATIVE) { 7261 leftMargin = startMargin; 7262 } 7263 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 7264 && endMargin > DEFAULT_MARGIN_RELATIVE) { 7265 rightMargin = endMargin; 7266 } 7267 } else { 7268 // We have some relative margins (either the start one or the end one or both). So use 7269 // them and override what has been defined for left and right margins. If either start 7270 // or end margin is not defined, just set it to default "0". 7271 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7272 case View.LAYOUT_DIRECTION_RTL: 7273 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7274 endMargin : DEFAULT_MARGIN_RESOLVED; 7275 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7276 startMargin : DEFAULT_MARGIN_RESOLVED; 7277 break; 7278 case View.LAYOUT_DIRECTION_LTR: 7279 default: 7280 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7281 startMargin : DEFAULT_MARGIN_RESOLVED; 7282 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7283 endMargin : DEFAULT_MARGIN_RESOLVED; 7284 break; 7285 } 7286 } 7287 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7288 } 7289 7290 /** 7291 * @hide 7292 */ 7293 public boolean isLayoutRtl() { 7294 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 7295 } 7296 7297 /** 7298 * @hide 7299 */ 7300 @Override 7301 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 7302 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 7303 7304 fillDifference(canvas, 7305 view.getLeft() + oi.left, 7306 view.getTop() + oi.top, 7307 view.getRight() - oi.right, 7308 view.getBottom() - oi.bottom, 7309 leftMargin, 7310 topMargin, 7311 rightMargin, 7312 bottomMargin, 7313 paint); 7314 } 7315 } 7316 7317 /* Describes a touched view and the ids of the pointers that it has captured. 7318 * 7319 * This code assumes that pointer ids are always in the range 0..31 such that 7320 * it can use a bitfield to track which pointer ids are present. 7321 * As it happens, the lower layers of the input dispatch pipeline also use the 7322 * same trick so the assumption should be safe here... 7323 */ 7324 private static final class TouchTarget { 7325 private static final int MAX_RECYCLED = 32; 7326 private static final Object sRecycleLock = new Object[0]; 7327 private static TouchTarget sRecycleBin; 7328 private static int sRecycledCount; 7329 7330 public static final int ALL_POINTER_IDS = -1; // all ones 7331 7332 // The touched child view. 7333 public View child; 7334 7335 // The combined bit mask of pointer ids for all pointers captured by the target. 7336 public int pointerIdBits; 7337 7338 // The next target in the target list. 7339 public TouchTarget next; 7340 7341 private TouchTarget() { 7342 } 7343 7344 public static TouchTarget obtain(View child, int pointerIdBits) { 7345 final TouchTarget target; 7346 synchronized (sRecycleLock) { 7347 if (sRecycleBin == null) { 7348 target = new TouchTarget(); 7349 } else { 7350 target = sRecycleBin; 7351 sRecycleBin = target.next; 7352 sRecycledCount--; 7353 target.next = null; 7354 } 7355 } 7356 target.child = child; 7357 target.pointerIdBits = pointerIdBits; 7358 return target; 7359 } 7360 7361 public void recycle() { 7362 synchronized (sRecycleLock) { 7363 if (sRecycledCount < MAX_RECYCLED) { 7364 next = sRecycleBin; 7365 sRecycleBin = this; 7366 sRecycledCount += 1; 7367 } else { 7368 next = null; 7369 } 7370 child = null; 7371 } 7372 } 7373 } 7374 7375 /* Describes a hovered view. */ 7376 private static final class HoverTarget { 7377 private static final int MAX_RECYCLED = 32; 7378 private static final Object sRecycleLock = new Object[0]; 7379 private static HoverTarget sRecycleBin; 7380 private static int sRecycledCount; 7381 7382 // The hovered child view. 7383 public View child; 7384 7385 // The next target in the target list. 7386 public HoverTarget next; 7387 7388 private HoverTarget() { 7389 } 7390 7391 public static HoverTarget obtain(View child) { 7392 final HoverTarget target; 7393 synchronized (sRecycleLock) { 7394 if (sRecycleBin == null) { 7395 target = new HoverTarget(); 7396 } else { 7397 target = sRecycleBin; 7398 sRecycleBin = target.next; 7399 sRecycledCount--; 7400 target.next = null; 7401 } 7402 } 7403 target.child = child; 7404 return target; 7405 } 7406 7407 public void recycle() { 7408 synchronized (sRecycleLock) { 7409 if (sRecycledCount < MAX_RECYCLED) { 7410 next = sRecycleBin; 7411 sRecycleBin = this; 7412 sRecycledCount += 1; 7413 } else { 7414 next = null; 7415 } 7416 child = null; 7417 } 7418 } 7419 } 7420 7421 /** 7422 * Pooled class that orderes the children of a ViewGroup from start 7423 * to end based on how they are laid out and the layout direction. 7424 */ 7425 static class ChildListForAccessibility { 7426 7427 private static final int MAX_POOL_SIZE = 32; 7428 7429 private static final SynchronizedPool<ChildListForAccessibility> sPool = 7430 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 7431 7432 private final ArrayList<View> mChildren = new ArrayList<View>(); 7433 7434 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 7435 7436 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 7437 ChildListForAccessibility list = sPool.acquire(); 7438 if (list == null) { 7439 list = new ChildListForAccessibility(); 7440 } 7441 list.init(parent, sort); 7442 return list; 7443 } 7444 7445 public void recycle() { 7446 clear(); 7447 sPool.release(this); 7448 } 7449 7450 public int getChildCount() { 7451 return mChildren.size(); 7452 } 7453 7454 public View getChildAt(int index) { 7455 return mChildren.get(index); 7456 } 7457 7458 public int getChildIndex(View child) { 7459 return mChildren.indexOf(child); 7460 } 7461 7462 private void init(ViewGroup parent, boolean sort) { 7463 ArrayList<View> children = mChildren; 7464 final int childCount = parent.getChildCount(); 7465 for (int i = 0; i < childCount; i++) { 7466 View child = parent.getChildAt(i); 7467 children.add(child); 7468 } 7469 if (sort) { 7470 ArrayList<ViewLocationHolder> holders = mHolders; 7471 for (int i = 0; i < childCount; i++) { 7472 View child = children.get(i); 7473 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 7474 holders.add(holder); 7475 } 7476 sort(holders); 7477 for (int i = 0; i < childCount; i++) { 7478 ViewLocationHolder holder = holders.get(i); 7479 children.set(i, holder.mView); 7480 holder.recycle(); 7481 } 7482 holders.clear(); 7483 } 7484 } 7485 7486 private void sort(ArrayList<ViewLocationHolder> holders) { 7487 // This is gross but the least risky solution. The current comparison 7488 // strategy breaks transitivity but produces very good results. Coming 7489 // up with a new strategy requires time which we do not have, so ... 7490 try { 7491 ViewLocationHolder.setComparisonStrategy( 7492 ViewLocationHolder.COMPARISON_STRATEGY_STRIPE); 7493 Collections.sort(holders); 7494 } catch (IllegalArgumentException iae) { 7495 // Note that in practice this occurs extremely rarely in a couple 7496 // of pathological cases. 7497 ViewLocationHolder.setComparisonStrategy( 7498 ViewLocationHolder.COMPARISON_STRATEGY_LOCATION); 7499 Collections.sort(holders); 7500 } 7501 } 7502 7503 private void clear() { 7504 mChildren.clear(); 7505 } 7506 } 7507 7508 /** 7509 * Pooled class that holds a View and its location with respect to 7510 * a specified root. This enables sorting of views based on their 7511 * coordinates without recomputing the position relative to the root 7512 * on every comparison. 7513 */ 7514 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 7515 7516 private static final int MAX_POOL_SIZE = 32; 7517 7518 private static final SynchronizedPool<ViewLocationHolder> sPool = 7519 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 7520 7521 public static final int COMPARISON_STRATEGY_STRIPE = 1; 7522 7523 public static final int COMPARISON_STRATEGY_LOCATION = 2; 7524 7525 private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE; 7526 7527 private final Rect mLocation = new Rect(); 7528 7529 public View mView; 7530 7531 private int mLayoutDirection; 7532 7533 public static ViewLocationHolder obtain(ViewGroup root, View view) { 7534 ViewLocationHolder holder = sPool.acquire(); 7535 if (holder == null) { 7536 holder = new ViewLocationHolder(); 7537 } 7538 holder.init(root, view); 7539 return holder; 7540 } 7541 7542 public static void setComparisonStrategy(int strategy) { 7543 sComparisonStrategy = strategy; 7544 } 7545 7546 public void recycle() { 7547 clear(); 7548 sPool.release(this); 7549 } 7550 7551 @Override 7552 public int compareTo(ViewLocationHolder another) { 7553 // This instance is greater than an invalid argument. 7554 if (another == null) { 7555 return 1; 7556 } 7557 7558 if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { 7559 // First is above second. 7560 if (mLocation.bottom - another.mLocation.top <= 0) { 7561 return -1; 7562 } 7563 // First is below second. 7564 if (mLocation.top - another.mLocation.bottom >= 0) { 7565 return 1; 7566 } 7567 } 7568 7569 // We are ordering left-to-right, top-to-bottom. 7570 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 7571 final int leftDifference = mLocation.left - another.mLocation.left; 7572 if (leftDifference != 0) { 7573 return leftDifference; 7574 } 7575 } else { // RTL 7576 final int rightDifference = mLocation.right - another.mLocation.right; 7577 if (rightDifference != 0) { 7578 return -rightDifference; 7579 } 7580 } 7581 // We are ordering left-to-right, top-to-bottom. 7582 final int topDifference = mLocation.top - another.mLocation.top; 7583 if (topDifference != 0) { 7584 return topDifference; 7585 } 7586 // Break tie by height. 7587 final int heightDiference = mLocation.height() - another.mLocation.height(); 7588 if (heightDiference != 0) { 7589 return -heightDiference; 7590 } 7591 // Break tie by width. 7592 final int widthDiference = mLocation.width() - another.mLocation.width(); 7593 if (widthDiference != 0) { 7594 return -widthDiference; 7595 } 7596 // Just break the tie somehow. The accessibliity ids are unique 7597 // and stable, hence this is deterministic tie breaking. 7598 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 7599 } 7600 7601 private void init(ViewGroup root, View view) { 7602 Rect viewLocation = mLocation; 7603 view.getDrawingRect(viewLocation); 7604 root.offsetDescendantRectToMyCoords(view, viewLocation); 7605 mView = view; 7606 mLayoutDirection = root.getLayoutDirection(); 7607 } 7608 7609 private void clear() { 7610 mView = null; 7611 mLocation.set(0, 0, 0, 0); 7612 } 7613 } 7614 7615 private static Paint getDebugPaint() { 7616 if (sDebugPaint == null) { 7617 sDebugPaint = new Paint(); 7618 sDebugPaint.setAntiAlias(false); 7619 } 7620 return sDebugPaint; 7621 } 7622 7623 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 7624 if (sDebugLines== null) { 7625 // TODO: This won't work with multiple UI threads in a single process 7626 sDebugLines = new float[16]; 7627 } 7628 7629 sDebugLines[0] = x1; 7630 sDebugLines[1] = y1; 7631 sDebugLines[2] = x2; 7632 sDebugLines[3] = y1; 7633 7634 sDebugLines[4] = x2; 7635 sDebugLines[5] = y1; 7636 sDebugLines[6] = x2; 7637 sDebugLines[7] = y2; 7638 7639 sDebugLines[8] = x2; 7640 sDebugLines[9] = y2; 7641 sDebugLines[10] = x1; 7642 sDebugLines[11] = y2; 7643 7644 sDebugLines[12] = x1; 7645 sDebugLines[13] = y2; 7646 sDebugLines[14] = x1; 7647 sDebugLines[15] = y1; 7648 7649 canvas.drawLines(sDebugLines, paint); 7650 } 7651} 7652