ViewGroup.java revision 0a778eda690a66173733a63622886e888d405c45
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.Pools.SynchronizedPool; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.accessibility.AccessibilityNodeInfo; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import com.android.internal.R; 48import com.android.internal.util.Predicate; 49 50import java.util.ArrayList; 51import java.util.Collections; 52import java.util.HashSet; 53 54import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 55 56/** 57 * <p> 58 * A <code>ViewGroup</code> is a special view that can contain other views 59 * (called children.) The view group is the base class for layouts and views 60 * containers. This class also defines the 61 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 62 * class for layouts parameters. 63 * </p> 64 * 65 * <p> 66 * Also see {@link LayoutParams} for layout attributes. 67 * </p> 68 * 69 * <div class="special reference"> 70 * <h3>Developer Guides</h3> 71 * <p>For more information about creating user interface layouts, read the 72 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 73 * guide.</p></div> 74 * 75 * <p>Here is a complete implementation of a custom ViewGroup that implements 76 * a simple {@link android.widget.FrameLayout} along with the ability to stack 77 * children in left and right gutters.</p> 78 * 79 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 80 * Complete} 81 * 82 * <p>If you are implementing XML layout attributes as shown in the example, this is the 83 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 84 * 85 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 86 * 87 * <p>Finally the layout manager can be used in an XML layout like so:</p> 88 * 89 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 90 * 91 * @attr ref android.R.styleable#ViewGroup_clipChildren 92 * @attr ref android.R.styleable#ViewGroup_clipToPadding 93 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 94 * @attr ref android.R.styleable#ViewGroup_animationCache 95 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 96 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 97 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 98 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 99 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 100 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 101 * @attr ref android.R.styleable#ViewGroup_layoutMode 102 */ 103public abstract class ViewGroup extends View implements ViewParent, ViewManager { 104 private static final String TAG = "ViewGroup"; 105 106 private static final boolean DBG = false; 107 /** @hide */ 108 public static boolean DEBUG_DRAW = false; 109 110 /** 111 * Views which have been hidden or removed which need to be animated on 112 * their way out. 113 * This field should be made private, so it is hidden from the SDK. 114 * {@hide} 115 */ 116 protected ArrayList<View> mDisappearingChildren; 117 118 /** 119 * Listener used to propagate events indicating when children are added 120 * and/or removed from a view group. 121 * This field should be made private, so it is hidden from the SDK. 122 * {@hide} 123 */ 124 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 125 126 // The view contained within this ViewGroup that has or contains focus. 127 private View mFocused; 128 129 /** 130 * A Transformation used when drawing children, to 131 * apply on the child being drawn. 132 */ 133 private Transformation mChildTransformation; 134 135 /** 136 * Used to track the current invalidation region. 137 */ 138 RectF mInvalidateRegion; 139 140 /** 141 * A Transformation used to calculate a correct 142 * invalidation area when the application is autoscaled. 143 */ 144 Transformation mInvalidationTransformation; 145 146 // View currently under an ongoing drag 147 private View mCurrentDragView; 148 149 // Metadata about the ongoing drag 150 private DragEvent mCurrentDrag; 151 private HashSet<View> mDragNotifiedChildren; 152 153 // Does this group have a child that can accept the current drag payload? 154 private boolean mChildAcceptsDrag; 155 156 // Used during drag dispatch 157 private PointF mLocalPoint; 158 159 // Layout animation 160 private LayoutAnimationController mLayoutAnimationController; 161 private Animation.AnimationListener mAnimationListener; 162 163 // First touch target in the linked list of touch targets. 164 private TouchTarget mFirstTouchTarget; 165 166 // For debugging only. You can see these in hierarchyviewer. 167 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 168 @ViewDebug.ExportedProperty(category = "events") 169 private long mLastTouchDownTime; 170 @ViewDebug.ExportedProperty(category = "events") 171 private int mLastTouchDownIndex = -1; 172 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 173 @ViewDebug.ExportedProperty(category = "events") 174 private float mLastTouchDownX; 175 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 176 @ViewDebug.ExportedProperty(category = "events") 177 private float mLastTouchDownY; 178 179 // First hover target in the linked list of hover targets. 180 // The hover targets are children which have received ACTION_HOVER_ENTER. 181 // They might not have actually handled the hover event, but we will 182 // continue sending hover events to them as long as the pointer remains over 183 // their bounds and the view group does not intercept hover. 184 private HoverTarget mFirstHoverTarget; 185 186 // True if the view group itself received a hover event. 187 // It might not have actually handled the hover event. 188 private boolean mHoveredSelf; 189 190 /** 191 * Internal flags. 192 * 193 * This field should be made private, so it is hidden from the SDK. 194 * {@hide} 195 */ 196 @ViewDebug.ExportedProperty(flagMapping = { 197 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 198 name = "CLIP_CHILDREN"), 199 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 200 name = "CLIP_TO_PADDING"), 201 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 202 name = "PADDING_NOT_NULL") 203 }) 204 protected int mGroupFlags; 205 206 /** 207 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 208 */ 209 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 210 211 /** 212 * NOTE: If you change the flags below make sure to reflect the changes 213 * the DisplayList class 214 */ 215 216 // When set, ViewGroup invalidates only the child's rectangle 217 // Set by default 218 static final int FLAG_CLIP_CHILDREN = 0x1; 219 220 // When set, ViewGroup excludes the padding area from the invalidate rectangle 221 // Set by default 222 private static final int FLAG_CLIP_TO_PADDING = 0x2; 223 224 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 225 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 226 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 227 228 // When set, dispatchDraw() will run the layout animation and unset the flag 229 private static final int FLAG_RUN_ANIMATION = 0x8; 230 231 // When set, there is either no layout animation on the ViewGroup or the layout 232 // animation is over 233 // Set by default 234 static final int FLAG_ANIMATION_DONE = 0x10; 235 236 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 237 // to clip it, even if FLAG_CLIP_TO_PADDING is set 238 private static final int FLAG_PADDING_NOT_NULL = 0x20; 239 240 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 241 // Set by default 242 private static final int FLAG_ANIMATION_CACHE = 0x40; 243 244 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 245 // layout animation; this avoid clobbering the hierarchy 246 // Automatically set when the layout animation starts, depending on the animation's 247 // characteristics 248 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 249 250 // When set, the next call to drawChild() will clear mChildTransformation's matrix 251 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 252 253 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 254 // the children's Bitmap caches if necessary 255 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 256 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 257 258 /** 259 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 260 * to get the index of the child to draw for that iteration. 261 * 262 * @hide 263 */ 264 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 265 266 /** 267 * When set, this ViewGroup supports static transformations on children; this causes 268 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 269 * invoked when a child is drawn. 270 * 271 * Any subclass overriding 272 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 273 * set this flags in {@link #mGroupFlags}. 274 * 275 * {@hide} 276 */ 277 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 278 279 // When the previous drawChild() invocation used an alpha value that was lower than 280 // 1.0 and set it in mCachePaint 281 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 282 283 /** 284 * When set, this ViewGroup's drawable states also include those 285 * of its children. 286 */ 287 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 288 289 /** 290 * When set, this ViewGroup tries to always draw its children using their drawing cache. 291 */ 292 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 293 294 /** 295 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 296 * draw its children with their drawing cache. 297 */ 298 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 299 300 /** 301 * When set, this group will go through its list of children to notify them of 302 * any drawable state change. 303 */ 304 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 305 306 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 307 308 /** 309 * This view will get focus before any of its descendants. 310 */ 311 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 312 313 /** 314 * This view will get focus only if none of its descendants want it. 315 */ 316 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 317 318 /** 319 * This view will block any of its descendants from getting focus, even 320 * if they are focusable. 321 */ 322 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 323 324 /** 325 * Used to map between enum in attrubutes and flag values. 326 */ 327 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 328 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 329 FOCUS_BLOCK_DESCENDANTS}; 330 331 /** 332 * When set, this ViewGroup should not intercept touch events. 333 * {@hide} 334 */ 335 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 336 337 /** 338 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 339 */ 340 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 341 342 /** 343 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 344 * to children when adding new views. This is used to prevent multiple 345 * onAttached calls when a ViewGroup adds children in its own onAttached method. 346 */ 347 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 348 349 /** 350 * When true, indicates that a layoutMode has been explicitly set, either with 351 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 352 * This distinguishes the situation in which a layout mode was inherited from 353 * one of the ViewGroup's ancestors and cached locally. 354 */ 355 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 356 357 /** 358 * When true, indicates that all 3d composited descendents are contained within this group, and 359 * will not be interleaved with other 3d composited content. 360 */ 361 static final int FLAG_ISOLATED_Z_VOLUME = 0x1000000; 362 363 static final int FLAG_IS_TRANSITION_GROUP = 0x2000000; 364 365 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x4000000; 366 367 /** 368 * Indicates which types of drawing caches are to be kept in memory. 369 * This field should be made private, so it is hidden from the SDK. 370 * {@hide} 371 */ 372 protected int mPersistentDrawingCache; 373 374 /** 375 * Used to indicate that no drawing cache should be kept in memory. 376 */ 377 public static final int PERSISTENT_NO_CACHE = 0x0; 378 379 /** 380 * Used to indicate that the animation drawing cache should be kept in memory. 381 */ 382 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 383 384 /** 385 * Used to indicate that the scrolling drawing cache should be kept in memory. 386 */ 387 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 388 389 /** 390 * Used to indicate that all drawing caches should be kept in memory. 391 */ 392 public static final int PERSISTENT_ALL_CACHES = 0x3; 393 394 // Layout Modes 395 396 private static final int LAYOUT_MODE_UNDEFINED = -1; 397 398 /** 399 * This constant is a {@link #setLayoutMode(int) layoutMode}. 400 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 401 * {@link #getRight() right} and {@link #getBottom() bottom}. 402 */ 403 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 404 405 /** 406 * This constant is a {@link #setLayoutMode(int) layoutMode}. 407 * Optical bounds describe where a widget appears to be. They sit inside the clip 408 * bounds which need to cover a larger area to allow other effects, 409 * such as shadows and glows, to be drawn. 410 */ 411 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 412 413 /** @hide */ 414 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 415 416 /** 417 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 418 * are set at the same time. 419 */ 420 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 421 422 // Index of the child's left position in the mLocation array 423 private static final int CHILD_LEFT_INDEX = 0; 424 // Index of the child's top position in the mLocation array 425 private static final int CHILD_TOP_INDEX = 1; 426 427 // Child views of this ViewGroup 428 private View[] mChildren; 429 // Number of valid children in the mChildren array, the rest should be null or not 430 // considered as children 431 private int mChildrenCount; 432 433 // Whether layout calls are currently being suppressed, controlled by calls to 434 // suppressLayout() 435 boolean mSuppressLayout = false; 436 437 // Whether any layout calls have actually been suppressed while mSuppressLayout 438 // has been true. This tracks whether we need to issue a requestLayout() when 439 // layout is later re-enabled. 440 private boolean mLayoutCalledWhileSuppressed = false; 441 442 private static final int ARRAY_INITIAL_CAPACITY = 12; 443 private static final int ARRAY_CAPACITY_INCREMENT = 12; 444 445 private static Paint sDebugPaint; 446 private static float[] sDebugLines; 447 448 // Used to draw cached views 449 Paint mCachePaint; 450 451 // Used to animate add/remove changes in layout 452 private LayoutTransition mTransition; 453 454 // The set of views that are currently being transitioned. This list is used to track views 455 // being removed that should not actually be removed from the parent yet because they are 456 // being animated. 457 private ArrayList<View> mTransitioningViews; 458 459 // List of children changing visibility. This is used to potentially keep rendering 460 // views during a transition when they otherwise would have become gone/invisible 461 private ArrayList<View> mVisibilityChangingChildren; 462 463 // Indicates how many of this container's child subtrees contain transient state 464 @ViewDebug.ExportedProperty(category = "layout") 465 private int mChildCountWithTransientState = 0; 466 467 public ViewGroup(Context context) { 468 this(context, null); 469 } 470 471 public ViewGroup(Context context, AttributeSet attrs) { 472 this(context, attrs, 0); 473 } 474 475 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 476 this(context, attrs, defStyleAttr, 0); 477 } 478 479 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 480 super(context, attrs, defStyleAttr, defStyleRes); 481 initViewGroup(); 482 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 483 } 484 485 private boolean debugDraw() { 486 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 487 } 488 489 private void initViewGroup() { 490 // ViewGroup doesn't draw by default 491 if (!debugDraw()) { 492 setFlags(WILL_NOT_DRAW, DRAW_MASK); 493 } 494 mGroupFlags |= FLAG_CLIP_CHILDREN; 495 mGroupFlags |= FLAG_CLIP_TO_PADDING; 496 mGroupFlags |= FLAG_ANIMATION_DONE; 497 mGroupFlags |= FLAG_ANIMATION_CACHE; 498 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 499 mGroupFlags |= FLAG_ISOLATED_Z_VOLUME; 500 501 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 502 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 503 } 504 505 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 506 507 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 508 mChildrenCount = 0; 509 510 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 511 } 512 513 private void initFromAttributes( 514 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 515 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup); 516 517 final int N = a.getIndexCount(); 518 for (int i = 0; i < N; i++) { 519 int attr = a.getIndex(i); 520 switch (attr) { 521 case R.styleable.ViewGroup_clipChildren: 522 setClipChildren(a.getBoolean(attr, true)); 523 break; 524 case R.styleable.ViewGroup_clipToPadding: 525 setClipToPadding(a.getBoolean(attr, true)); 526 break; 527 case R.styleable.ViewGroup_isolatedZVolume: 528 setIsolatedZVolume(a.getBoolean(attr, true)); 529 break; 530 case R.styleable.ViewGroup_animationCache: 531 setAnimationCacheEnabled(a.getBoolean(attr, true)); 532 break; 533 case R.styleable.ViewGroup_persistentDrawingCache: 534 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 535 break; 536 case R.styleable.ViewGroup_addStatesFromChildren: 537 setAddStatesFromChildren(a.getBoolean(attr, false)); 538 break; 539 case R.styleable.ViewGroup_alwaysDrawnWithCache: 540 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 541 break; 542 case R.styleable.ViewGroup_layoutAnimation: 543 int id = a.getResourceId(attr, -1); 544 if (id > 0) { 545 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 546 } 547 break; 548 case R.styleable.ViewGroup_descendantFocusability: 549 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 550 break; 551 case R.styleable.ViewGroup_splitMotionEvents: 552 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 553 break; 554 case R.styleable.ViewGroup_animateLayoutChanges: 555 boolean animateLayoutChanges = a.getBoolean(attr, false); 556 if (animateLayoutChanges) { 557 setLayoutTransition(new LayoutTransition()); 558 } 559 break; 560 case R.styleable.ViewGroup_layoutMode: 561 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 562 break; 563 case R.styleable.ViewGroup_transitionGroup: 564 setTransitionGroup(a.getBoolean(attr, false)); 565 break; 566 } 567 } 568 569 a.recycle(); 570 } 571 572 /** 573 * Gets the descendant focusability of this view group. The descendant 574 * focusability defines the relationship between this view group and its 575 * descendants when looking for a view to take focus in 576 * {@link #requestFocus(int, android.graphics.Rect)}. 577 * 578 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 579 * {@link #FOCUS_BLOCK_DESCENDANTS}. 580 */ 581 @ViewDebug.ExportedProperty(category = "focus", mapping = { 582 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 583 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 584 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 585 }) 586 public int getDescendantFocusability() { 587 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 588 } 589 590 /** 591 * Set the descendant focusability of this view group. This defines the relationship 592 * between this view group and its descendants when looking for a view to 593 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 594 * 595 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 596 * {@link #FOCUS_BLOCK_DESCENDANTS}. 597 */ 598 public void setDescendantFocusability(int focusability) { 599 switch (focusability) { 600 case FOCUS_BEFORE_DESCENDANTS: 601 case FOCUS_AFTER_DESCENDANTS: 602 case FOCUS_BLOCK_DESCENDANTS: 603 break; 604 default: 605 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 606 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 607 } 608 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 609 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 610 } 611 612 /** 613 * {@inheritDoc} 614 */ 615 @Override 616 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 617 if (mFocused != null) { 618 mFocused.unFocus(this); 619 mFocused = null; 620 } 621 super.handleFocusGainInternal(direction, previouslyFocusedRect); 622 } 623 624 /** 625 * {@inheritDoc} 626 */ 627 public void requestChildFocus(View child, View focused) { 628 if (DBG) { 629 System.out.println(this + " requestChildFocus()"); 630 } 631 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 632 return; 633 } 634 635 // Unfocus us, if necessary 636 super.unFocus(focused); 637 638 // We had a previous notion of who had focus. Clear it. 639 if (mFocused != child) { 640 if (mFocused != null) { 641 mFocused.unFocus(focused); 642 } 643 644 mFocused = child; 645 } 646 if (mParent != null) { 647 mParent.requestChildFocus(this, focused); 648 } 649 } 650 651 /** 652 * {@inheritDoc} 653 */ 654 public void focusableViewAvailable(View v) { 655 if (mParent != null 656 // shortcut: don't report a new focusable view if we block our descendants from 657 // getting focus 658 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 659 // shortcut: don't report a new focusable view if we already are focused 660 // (and we don't prefer our descendants) 661 // 662 // note: knowing that mFocused is non-null is not a good enough reason 663 // to break the traversal since in that case we'd actually have to find 664 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 665 // an ancestor of v; this will get checked for at ViewAncestor 666 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 667 mParent.focusableViewAvailable(v); 668 } 669 } 670 671 /** 672 * {@inheritDoc} 673 */ 674 public boolean showContextMenuForChild(View originalView) { 675 return mParent != null && mParent.showContextMenuForChild(originalView); 676 } 677 678 /** 679 * {@inheritDoc} 680 */ 681 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 682 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 683 } 684 685 /** 686 * Find the nearest view in the specified direction that wants to take 687 * focus. 688 * 689 * @param focused The view that currently has focus 690 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 691 * FOCUS_RIGHT, or 0 for not applicable. 692 */ 693 public View focusSearch(View focused, int direction) { 694 if (isRootNamespace()) { 695 // root namespace means we should consider ourselves the top of the 696 // tree for focus searching; otherwise we could be focus searching 697 // into other tabs. see LocalActivityManager and TabHost for more info 698 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 699 } else if (mParent != null) { 700 return mParent.focusSearch(focused, direction); 701 } 702 return null; 703 } 704 705 /** 706 * {@inheritDoc} 707 */ 708 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 709 return false; 710 } 711 712 /** 713 * {@inheritDoc} 714 */ 715 @Override 716 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 717 ViewParent parent = mParent; 718 if (parent == null) { 719 return false; 720 } 721 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 722 if (!propagate) { 723 return false; 724 } 725 return parent.requestSendAccessibilityEvent(this, event); 726 } 727 728 /** 729 * Called when a child has requested sending an {@link AccessibilityEvent} and 730 * gives an opportunity to its parent to augment the event. 731 * <p> 732 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 733 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 734 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 735 * is responsible for handling this call. 736 * </p> 737 * 738 * @param child The child which requests sending the event. 739 * @param event The event to be sent. 740 * @return True if the event should be sent. 741 * 742 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 743 */ 744 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 745 if (mAccessibilityDelegate != null) { 746 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 747 } else { 748 return onRequestSendAccessibilityEventInternal(child, event); 749 } 750 } 751 752 /** 753 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 754 * 755 * Note: Called from the default {@link View.AccessibilityDelegate}. 756 */ 757 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 758 return true; 759 } 760 761 /** 762 * Called when a child view has changed whether or not it is tracking transient state. 763 */ 764 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 765 final boolean oldHasTransientState = hasTransientState(); 766 if (childHasTransientState) { 767 mChildCountWithTransientState++; 768 } else { 769 mChildCountWithTransientState--; 770 } 771 772 final boolean newHasTransientState = hasTransientState(); 773 if (mParent != null && oldHasTransientState != newHasTransientState) { 774 try { 775 mParent.childHasTransientStateChanged(this, newHasTransientState); 776 } catch (AbstractMethodError e) { 777 Log.e(TAG, mParent.getClass().getSimpleName() + 778 " does not fully implement ViewParent", e); 779 } 780 } 781 } 782 783 @Override 784 public boolean hasTransientState() { 785 return mChildCountWithTransientState > 0 || super.hasTransientState(); 786 } 787 788 /** 789 * {@inheritDoc} 790 */ 791 @Override 792 public boolean dispatchUnhandledMove(View focused, int direction) { 793 return mFocused != null && 794 mFocused.dispatchUnhandledMove(focused, direction); 795 } 796 797 /** 798 * {@inheritDoc} 799 */ 800 public void clearChildFocus(View child) { 801 if (DBG) { 802 System.out.println(this + " clearChildFocus()"); 803 } 804 805 mFocused = null; 806 if (mParent != null) { 807 mParent.clearChildFocus(this); 808 } 809 } 810 811 /** 812 * {@inheritDoc} 813 */ 814 @Override 815 public void clearFocus() { 816 if (DBG) { 817 System.out.println(this + " clearFocus()"); 818 } 819 if (mFocused == null) { 820 super.clearFocus(); 821 } else { 822 View focused = mFocused; 823 mFocused = null; 824 focused.clearFocus(); 825 } 826 } 827 828 /** 829 * {@inheritDoc} 830 */ 831 @Override 832 void unFocus(View focused) { 833 if (DBG) { 834 System.out.println(this + " unFocus()"); 835 } 836 if (mFocused == null) { 837 super.unFocus(focused); 838 } else { 839 mFocused.unFocus(focused); 840 mFocused = null; 841 } 842 } 843 844 /** 845 * Returns the focused child of this view, if any. The child may have focus 846 * or contain focus. 847 * 848 * @return the focused child or null. 849 */ 850 public View getFocusedChild() { 851 return mFocused; 852 } 853 854 /** 855 * Returns true if this view has or contains focus 856 * 857 * @return true if this view has or contains focus 858 */ 859 @Override 860 public boolean hasFocus() { 861 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 862 } 863 864 /* 865 * (non-Javadoc) 866 * 867 * @see android.view.View#findFocus() 868 */ 869 @Override 870 public View findFocus() { 871 if (DBG) { 872 System.out.println("Find focus in " + this + ": flags=" 873 + isFocused() + ", child=" + mFocused); 874 } 875 876 if (isFocused()) { 877 return this; 878 } 879 880 if (mFocused != null) { 881 return mFocused.findFocus(); 882 } 883 return null; 884 } 885 886 /** 887 * {@inheritDoc} 888 */ 889 @Override 890 public boolean hasFocusable() { 891 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 892 return false; 893 } 894 895 if (isFocusable()) { 896 return true; 897 } 898 899 final int descendantFocusability = getDescendantFocusability(); 900 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 901 final int count = mChildrenCount; 902 final View[] children = mChildren; 903 904 for (int i = 0; i < count; i++) { 905 final View child = children[i]; 906 if (child.hasFocusable()) { 907 return true; 908 } 909 } 910 } 911 912 return false; 913 } 914 915 /** 916 * {@inheritDoc} 917 */ 918 @Override 919 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 920 final int focusableCount = views.size(); 921 922 final int descendantFocusability = getDescendantFocusability(); 923 924 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 925 final int count = mChildrenCount; 926 final View[] children = mChildren; 927 928 for (int i = 0; i < count; i++) { 929 final View child = children[i]; 930 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 931 child.addFocusables(views, direction, focusableMode); 932 } 933 } 934 } 935 936 // we add ourselves (if focusable) in all cases except for when we are 937 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 938 // to avoid the focus search finding layouts when a more precise search 939 // among the focusable children would be more interesting. 940 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 941 // No focusable descendants 942 || (focusableCount == views.size())) { 943 super.addFocusables(views, direction, focusableMode); 944 } 945 } 946 947 @Override 948 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 949 super.findViewsWithText(outViews, text, flags); 950 final int childrenCount = mChildrenCount; 951 final View[] children = mChildren; 952 for (int i = 0; i < childrenCount; i++) { 953 View child = children[i]; 954 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 955 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 956 child.findViewsWithText(outViews, text, flags); 957 } 958 } 959 } 960 961 /** @hide */ 962 @Override 963 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 964 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 965 if (foundView != null) { 966 return foundView; 967 } 968 final int childrenCount = mChildrenCount; 969 final View[] children = mChildren; 970 for (int i = 0; i < childrenCount; i++) { 971 View child = children[i]; 972 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 973 if (foundView != null) { 974 return foundView; 975 } 976 } 977 return null; 978 } 979 980 /** 981 * {@inheritDoc} 982 */ 983 @Override 984 public void dispatchWindowFocusChanged(boolean hasFocus) { 985 super.dispatchWindowFocusChanged(hasFocus); 986 final int count = mChildrenCount; 987 final View[] children = mChildren; 988 for (int i = 0; i < count; i++) { 989 children[i].dispatchWindowFocusChanged(hasFocus); 990 } 991 } 992 993 /** 994 * {@inheritDoc} 995 */ 996 @Override 997 public void addTouchables(ArrayList<View> views) { 998 super.addTouchables(views); 999 1000 final int count = mChildrenCount; 1001 final View[] children = mChildren; 1002 1003 for (int i = 0; i < count; i++) { 1004 final View child = children[i]; 1005 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1006 child.addTouchables(views); 1007 } 1008 } 1009 } 1010 1011 /** 1012 * @hide 1013 */ 1014 @Override 1015 public void makeOptionalFitsSystemWindows() { 1016 super.makeOptionalFitsSystemWindows(); 1017 final int count = mChildrenCount; 1018 final View[] children = mChildren; 1019 for (int i = 0; i < count; i++) { 1020 children[i].makeOptionalFitsSystemWindows(); 1021 } 1022 } 1023 1024 /** 1025 * {@inheritDoc} 1026 */ 1027 @Override 1028 public void dispatchDisplayHint(int hint) { 1029 super.dispatchDisplayHint(hint); 1030 final int count = mChildrenCount; 1031 final View[] children = mChildren; 1032 for (int i = 0; i < count; i++) { 1033 children[i].dispatchDisplayHint(hint); 1034 } 1035 } 1036 1037 /** 1038 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1039 * action. 1040 * 1041 * @param child The view whose visibility has changed 1042 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1043 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1044 * @hide 1045 */ 1046 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1047 if (mTransition != null) { 1048 if (newVisibility == VISIBLE) { 1049 mTransition.showChild(this, child, oldVisibility); 1050 } else { 1051 mTransition.hideChild(this, child, newVisibility); 1052 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1053 // Only track this on disappearing views - appearing views are already visible 1054 // and don't need special handling during drawChild() 1055 if (mVisibilityChangingChildren == null) { 1056 mVisibilityChangingChildren = new ArrayList<View>(); 1057 } 1058 mVisibilityChangingChildren.add(child); 1059 addDisappearingView(child); 1060 } 1061 } 1062 } 1063 1064 // in all cases, for drags 1065 if (mCurrentDrag != null) { 1066 if (newVisibility == VISIBLE) { 1067 notifyChildOfDrag(child); 1068 } 1069 } 1070 } 1071 1072 /** 1073 * {@inheritDoc} 1074 */ 1075 @Override 1076 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1077 super.dispatchVisibilityChanged(changedView, visibility); 1078 final int count = mChildrenCount; 1079 final View[] children = mChildren; 1080 for (int i = 0; i < count; i++) { 1081 children[i].dispatchVisibilityChanged(changedView, visibility); 1082 } 1083 } 1084 1085 /** 1086 * {@inheritDoc} 1087 */ 1088 @Override 1089 public void dispatchWindowVisibilityChanged(int visibility) { 1090 super.dispatchWindowVisibilityChanged(visibility); 1091 final int count = mChildrenCount; 1092 final View[] children = mChildren; 1093 for (int i = 0; i < count; i++) { 1094 children[i].dispatchWindowVisibilityChanged(visibility); 1095 } 1096 } 1097 1098 /** 1099 * {@inheritDoc} 1100 */ 1101 @Override 1102 public void dispatchConfigurationChanged(Configuration newConfig) { 1103 super.dispatchConfigurationChanged(newConfig); 1104 final int count = mChildrenCount; 1105 final View[] children = mChildren; 1106 for (int i = 0; i < count; i++) { 1107 children[i].dispatchConfigurationChanged(newConfig); 1108 } 1109 } 1110 1111 /** 1112 * {@inheritDoc} 1113 */ 1114 public void recomputeViewAttributes(View child) { 1115 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1116 ViewParent parent = mParent; 1117 if (parent != null) parent.recomputeViewAttributes(this); 1118 } 1119 } 1120 1121 @Override 1122 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1123 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1124 super.dispatchCollectViewAttributes(attachInfo, visibility); 1125 final int count = mChildrenCount; 1126 final View[] children = mChildren; 1127 for (int i = 0; i < count; i++) { 1128 final View child = children[i]; 1129 child.dispatchCollectViewAttributes(attachInfo, 1130 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1131 } 1132 } 1133 } 1134 1135 /** 1136 * {@inheritDoc} 1137 */ 1138 public void bringChildToFront(View child) { 1139 int index = indexOfChild(child); 1140 if (index >= 0) { 1141 removeFromArray(index); 1142 addInArray(child, mChildrenCount); 1143 child.mParent = this; 1144 requestLayout(); 1145 invalidate(); 1146 } 1147 } 1148 1149 private PointF getLocalPoint() { 1150 if (mLocalPoint == null) mLocalPoint = new PointF(); 1151 return mLocalPoint; 1152 } 1153 1154 /** 1155 * {@inheritDoc} 1156 */ 1157 // TODO: Write real docs 1158 @Override 1159 public boolean dispatchDragEvent(DragEvent event) { 1160 boolean retval = false; 1161 final float tx = event.mX; 1162 final float ty = event.mY; 1163 1164 ViewRootImpl root = getViewRootImpl(); 1165 1166 // Dispatch down the view hierarchy 1167 final PointF localPoint = getLocalPoint(); 1168 1169 switch (event.mAction) { 1170 case DragEvent.ACTION_DRAG_STARTED: { 1171 // clear state to recalculate which views we drag over 1172 mCurrentDragView = null; 1173 1174 // Set up our tracking of drag-started notifications 1175 mCurrentDrag = DragEvent.obtain(event); 1176 if (mDragNotifiedChildren == null) { 1177 mDragNotifiedChildren = new HashSet<View>(); 1178 } else { 1179 mDragNotifiedChildren.clear(); 1180 } 1181 1182 // Now dispatch down to our children, caching the responses 1183 mChildAcceptsDrag = false; 1184 final int count = mChildrenCount; 1185 final View[] children = mChildren; 1186 for (int i = 0; i < count; i++) { 1187 final View child = children[i]; 1188 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1189 if (child.getVisibility() == VISIBLE) { 1190 final boolean handled = notifyChildOfDrag(children[i]); 1191 if (handled) { 1192 mChildAcceptsDrag = true; 1193 } 1194 } 1195 } 1196 1197 // Return HANDLED if one of our children can accept the drag 1198 if (mChildAcceptsDrag) { 1199 retval = true; 1200 } 1201 } break; 1202 1203 case DragEvent.ACTION_DRAG_ENDED: { 1204 // Release the bookkeeping now that the drag lifecycle has ended 1205 if (mDragNotifiedChildren != null) { 1206 for (View child : mDragNotifiedChildren) { 1207 // If a child was notified about an ongoing drag, it's told that it's over 1208 child.dispatchDragEvent(event); 1209 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1210 child.refreshDrawableState(); 1211 } 1212 1213 mDragNotifiedChildren.clear(); 1214 if (mCurrentDrag != null) { 1215 mCurrentDrag.recycle(); 1216 mCurrentDrag = null; 1217 } 1218 } 1219 1220 // We consider drag-ended to have been handled if one of our children 1221 // had offered to handle the drag. 1222 if (mChildAcceptsDrag) { 1223 retval = true; 1224 } 1225 } break; 1226 1227 case DragEvent.ACTION_DRAG_LOCATION: { 1228 // Find the [possibly new] drag target 1229 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1230 1231 // If we've changed apparent drag target, tell the view root which view 1232 // we're over now [for purposes of the eventual drag-recipient-changed 1233 // notifications to the framework] and tell the new target that the drag 1234 // has entered its bounds. The root will see setDragFocus() calls all 1235 // the way down to the final leaf view that is handling the LOCATION event 1236 // before reporting the new potential recipient to the framework. 1237 if (mCurrentDragView != target) { 1238 root.setDragFocus(target); 1239 1240 final int action = event.mAction; 1241 // If we've dragged off of a child view, send it the EXITED message 1242 if (mCurrentDragView != null) { 1243 final View view = mCurrentDragView; 1244 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1245 view.dispatchDragEvent(event); 1246 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1247 view.refreshDrawableState(); 1248 } 1249 mCurrentDragView = target; 1250 1251 // If we've dragged over a new child view, send it the ENTERED message 1252 if (target != null) { 1253 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1254 target.dispatchDragEvent(event); 1255 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1256 target.refreshDrawableState(); 1257 } 1258 event.mAction = action; // restore the event's original state 1259 } 1260 1261 // Dispatch the actual drag location notice, localized into its coordinates 1262 if (target != null) { 1263 event.mX = localPoint.x; 1264 event.mY = localPoint.y; 1265 1266 retval = target.dispatchDragEvent(event); 1267 1268 event.mX = tx; 1269 event.mY = ty; 1270 } 1271 } break; 1272 1273 /* Entered / exited dispatch 1274 * 1275 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1276 * that we're about to get the corresponding LOCATION event, which we will use to 1277 * determine which of our children is the new target; at that point we will 1278 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1279 * 1280 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1281 * drag has left this ViewGroup, we know by definition that every contained subview 1282 * is also no longer under the drag point. 1283 */ 1284 1285 case DragEvent.ACTION_DRAG_EXITED: { 1286 if (mCurrentDragView != null) { 1287 final View view = mCurrentDragView; 1288 view.dispatchDragEvent(event); 1289 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1290 view.refreshDrawableState(); 1291 1292 mCurrentDragView = null; 1293 } 1294 } break; 1295 1296 case DragEvent.ACTION_DROP: { 1297 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1298 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1299 if (target != null) { 1300 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1301 event.mX = localPoint.x; 1302 event.mY = localPoint.y; 1303 retval = target.dispatchDragEvent(event); 1304 event.mX = tx; 1305 event.mY = ty; 1306 } else { 1307 if (ViewDebug.DEBUG_DRAG) { 1308 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1309 } 1310 } 1311 } break; 1312 } 1313 1314 // If none of our children could handle the event, try here 1315 if (!retval) { 1316 // Call up to the View implementation that dispatches to installed listeners 1317 retval = super.dispatchDragEvent(event); 1318 } 1319 return retval; 1320 } 1321 1322 // Find the frontmost child view that lies under the given point, and calculate 1323 // the position within its own local coordinate system. 1324 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1325 final int count = mChildrenCount; 1326 final View[] children = mChildren; 1327 for (int i = count - 1; i >= 0; i--) { 1328 final View child = children[i]; 1329 if (!child.canAcceptDrag()) { 1330 continue; 1331 } 1332 1333 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1334 return child; 1335 } 1336 } 1337 return null; 1338 } 1339 1340 boolean notifyChildOfDrag(View child) { 1341 if (ViewDebug.DEBUG_DRAG) { 1342 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1343 } 1344 1345 boolean canAccept = false; 1346 if (! mDragNotifiedChildren.contains(child)) { 1347 mDragNotifiedChildren.add(child); 1348 canAccept = child.dispatchDragEvent(mCurrentDrag); 1349 if (canAccept && !child.canAcceptDrag()) { 1350 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1351 child.refreshDrawableState(); 1352 } 1353 } 1354 return canAccept; 1355 } 1356 1357 @Override 1358 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1359 super.dispatchWindowSystemUiVisiblityChanged(visible); 1360 1361 final int count = mChildrenCount; 1362 final View[] children = mChildren; 1363 for (int i=0; i <count; i++) { 1364 final View child = children[i]; 1365 child.dispatchWindowSystemUiVisiblityChanged(visible); 1366 } 1367 } 1368 1369 @Override 1370 public void dispatchSystemUiVisibilityChanged(int visible) { 1371 super.dispatchSystemUiVisibilityChanged(visible); 1372 1373 final int count = mChildrenCount; 1374 final View[] children = mChildren; 1375 for (int i=0; i <count; i++) { 1376 final View child = children[i]; 1377 child.dispatchSystemUiVisibilityChanged(visible); 1378 } 1379 } 1380 1381 @Override 1382 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1383 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1384 1385 final int count = mChildrenCount; 1386 final View[] children = mChildren; 1387 for (int i=0; i <count; i++) { 1388 final View child = children[i]; 1389 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1390 } 1391 return changed; 1392 } 1393 1394 /** 1395 * {@inheritDoc} 1396 */ 1397 @Override 1398 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1399 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1400 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1401 return super.dispatchKeyEventPreIme(event); 1402 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1403 == PFLAG_HAS_BOUNDS) { 1404 return mFocused.dispatchKeyEventPreIme(event); 1405 } 1406 return false; 1407 } 1408 1409 /** 1410 * {@inheritDoc} 1411 */ 1412 @Override 1413 public boolean dispatchKeyEvent(KeyEvent event) { 1414 if (mInputEventConsistencyVerifier != null) { 1415 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1416 } 1417 1418 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1419 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1420 if (super.dispatchKeyEvent(event)) { 1421 return true; 1422 } 1423 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1424 == PFLAG_HAS_BOUNDS) { 1425 if (mFocused.dispatchKeyEvent(event)) { 1426 return true; 1427 } 1428 } 1429 1430 if (mInputEventConsistencyVerifier != null) { 1431 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1432 } 1433 return false; 1434 } 1435 1436 /** 1437 * {@inheritDoc} 1438 */ 1439 @Override 1440 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1441 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1442 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1443 return super.dispatchKeyShortcutEvent(event); 1444 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1445 == PFLAG_HAS_BOUNDS) { 1446 return mFocused.dispatchKeyShortcutEvent(event); 1447 } 1448 return false; 1449 } 1450 1451 /** 1452 * {@inheritDoc} 1453 */ 1454 @Override 1455 public boolean dispatchTrackballEvent(MotionEvent event) { 1456 if (mInputEventConsistencyVerifier != null) { 1457 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1458 } 1459 1460 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1461 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1462 if (super.dispatchTrackballEvent(event)) { 1463 return true; 1464 } 1465 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1466 == PFLAG_HAS_BOUNDS) { 1467 if (mFocused.dispatchTrackballEvent(event)) { 1468 return true; 1469 } 1470 } 1471 1472 if (mInputEventConsistencyVerifier != null) { 1473 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1474 } 1475 return false; 1476 } 1477 1478 /** 1479 * {@inheritDoc} 1480 */ 1481 @SuppressWarnings({"ConstantConditions"}) 1482 @Override 1483 protected boolean dispatchHoverEvent(MotionEvent event) { 1484 final int action = event.getAction(); 1485 1486 // First check whether the view group wants to intercept the hover event. 1487 final boolean interceptHover = onInterceptHoverEvent(event); 1488 event.setAction(action); // restore action in case it was changed 1489 1490 MotionEvent eventNoHistory = event; 1491 boolean handled = false; 1492 1493 // Send events to the hovered children and build a new list of hover targets until 1494 // one is found that handles the event. 1495 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1496 mFirstHoverTarget = null; 1497 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1498 final float x = event.getX(); 1499 final float y = event.getY(); 1500 final int childrenCount = mChildrenCount; 1501 if (childrenCount != 0) { 1502 final boolean customChildOrder = isChildrenDrawingOrderEnabled(); 1503 final View[] children = mChildren; 1504 HoverTarget lastHoverTarget = null; 1505 for (int i = childrenCount - 1; i >= 0; i--) { 1506 final int childIndex = customChildOrder 1507 ? getChildDrawingOrder(childrenCount, i) : i; 1508 final View child = children[childIndex]; 1509 if (!canViewReceivePointerEvents(child) 1510 || !isTransformedTouchPointInView(x, y, child, null)) { 1511 continue; 1512 } 1513 1514 // Obtain a hover target for this child. Dequeue it from the 1515 // old hover target list if the child was previously hovered. 1516 HoverTarget hoverTarget = firstOldHoverTarget; 1517 final boolean wasHovered; 1518 for (HoverTarget predecessor = null; ;) { 1519 if (hoverTarget == null) { 1520 hoverTarget = HoverTarget.obtain(child); 1521 wasHovered = false; 1522 break; 1523 } 1524 1525 if (hoverTarget.child == child) { 1526 if (predecessor != null) { 1527 predecessor.next = hoverTarget.next; 1528 } else { 1529 firstOldHoverTarget = hoverTarget.next; 1530 } 1531 hoverTarget.next = null; 1532 wasHovered = true; 1533 break; 1534 } 1535 1536 predecessor = hoverTarget; 1537 hoverTarget = hoverTarget.next; 1538 } 1539 1540 // Enqueue the hover target onto the new hover target list. 1541 if (lastHoverTarget != null) { 1542 lastHoverTarget.next = hoverTarget; 1543 } else { 1544 mFirstHoverTarget = hoverTarget; 1545 } 1546 lastHoverTarget = hoverTarget; 1547 1548 // Dispatch the event to the child. 1549 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1550 if (!wasHovered) { 1551 // Send the enter as is. 1552 handled |= dispatchTransformedGenericPointerEvent( 1553 event, child); // enter 1554 } 1555 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1556 if (!wasHovered) { 1557 // Synthesize an enter from a move. 1558 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1559 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1560 handled |= dispatchTransformedGenericPointerEvent( 1561 eventNoHistory, child); // enter 1562 eventNoHistory.setAction(action); 1563 1564 handled |= dispatchTransformedGenericPointerEvent( 1565 eventNoHistory, child); // move 1566 } else { 1567 // Send the move as is. 1568 handled |= dispatchTransformedGenericPointerEvent(event, child); 1569 } 1570 } 1571 if (handled) { 1572 break; 1573 } 1574 } 1575 } 1576 } 1577 1578 // Send exit events to all previously hovered children that are no longer hovered. 1579 while (firstOldHoverTarget != null) { 1580 final View child = firstOldHoverTarget.child; 1581 1582 // Exit the old hovered child. 1583 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1584 // Send the exit as is. 1585 handled |= dispatchTransformedGenericPointerEvent( 1586 event, child); // exit 1587 } else { 1588 // Synthesize an exit from a move or enter. 1589 // Ignore the result because hover focus has moved to a different view. 1590 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1591 dispatchTransformedGenericPointerEvent( 1592 event, child); // move 1593 } 1594 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1595 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1596 dispatchTransformedGenericPointerEvent( 1597 eventNoHistory, child); // exit 1598 eventNoHistory.setAction(action); 1599 } 1600 1601 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1602 firstOldHoverTarget.recycle(); 1603 firstOldHoverTarget = nextOldHoverTarget; 1604 } 1605 1606 // Send events to the view group itself if no children have handled it. 1607 boolean newHoveredSelf = !handled; 1608 if (newHoveredSelf == mHoveredSelf) { 1609 if (newHoveredSelf) { 1610 // Send event to the view group as before. 1611 handled |= super.dispatchHoverEvent(event); 1612 } 1613 } else { 1614 if (mHoveredSelf) { 1615 // Exit the view group. 1616 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1617 // Send the exit as is. 1618 handled |= super.dispatchHoverEvent(event); // exit 1619 } else { 1620 // Synthesize an exit from a move or enter. 1621 // Ignore the result because hover focus is moving to a different view. 1622 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1623 super.dispatchHoverEvent(event); // move 1624 } 1625 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1626 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1627 super.dispatchHoverEvent(eventNoHistory); // exit 1628 eventNoHistory.setAction(action); 1629 } 1630 mHoveredSelf = false; 1631 } 1632 1633 if (newHoveredSelf) { 1634 // Enter the view group. 1635 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1636 // Send the enter as is. 1637 handled |= super.dispatchHoverEvent(event); // enter 1638 mHoveredSelf = true; 1639 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1640 // Synthesize an enter from a move. 1641 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1642 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1643 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1644 eventNoHistory.setAction(action); 1645 1646 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1647 mHoveredSelf = true; 1648 } 1649 } 1650 } 1651 1652 // Recycle the copy of the event that we made. 1653 if (eventNoHistory != event) { 1654 eventNoHistory.recycle(); 1655 } 1656 1657 // Done. 1658 return handled; 1659 } 1660 1661 private void exitHoverTargets() { 1662 if (mHoveredSelf || mFirstHoverTarget != null) { 1663 final long now = SystemClock.uptimeMillis(); 1664 MotionEvent event = MotionEvent.obtain(now, now, 1665 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1666 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1667 dispatchHoverEvent(event); 1668 event.recycle(); 1669 } 1670 } 1671 1672 private void cancelHoverTarget(View view) { 1673 HoverTarget predecessor = null; 1674 HoverTarget target = mFirstHoverTarget; 1675 while (target != null) { 1676 final HoverTarget next = target.next; 1677 if (target.child == view) { 1678 if (predecessor == null) { 1679 mFirstHoverTarget = next; 1680 } else { 1681 predecessor.next = next; 1682 } 1683 target.recycle(); 1684 1685 final long now = SystemClock.uptimeMillis(); 1686 MotionEvent event = MotionEvent.obtain(now, now, 1687 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1688 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1689 view.dispatchHoverEvent(event); 1690 event.recycle(); 1691 return; 1692 } 1693 predecessor = target; 1694 target = next; 1695 } 1696 } 1697 1698 /** @hide */ 1699 @Override 1700 protected boolean hasHoveredChild() { 1701 return mFirstHoverTarget != null; 1702 } 1703 1704 @Override 1705 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1706 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1707 try { 1708 final int childrenCount = children.getChildCount(); 1709 for (int i = 0; i < childrenCount; i++) { 1710 View child = children.getChildAt(i); 1711 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1712 if (child.includeForAccessibility()) { 1713 childrenForAccessibility.add(child); 1714 } else { 1715 child.addChildrenForAccessibility(childrenForAccessibility); 1716 } 1717 } 1718 } 1719 } finally { 1720 children.recycle(); 1721 } 1722 } 1723 1724 /** 1725 * Implement this method to intercept hover events before they are handled 1726 * by child views. 1727 * <p> 1728 * This method is called before dispatching a hover event to a child of 1729 * the view group or to the view group's own {@link #onHoverEvent} to allow 1730 * the view group a chance to intercept the hover event. 1731 * This method can also be used to watch all pointer motions that occur within 1732 * the bounds of the view group even when the pointer is hovering over 1733 * a child of the view group rather than over the view group itself. 1734 * </p><p> 1735 * The view group can prevent its children from receiving hover events by 1736 * implementing this method and returning <code>true</code> to indicate 1737 * that it would like to intercept hover events. The view group must 1738 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1739 * for as long as it wishes to continue intercepting hover events from 1740 * its children. 1741 * </p><p> 1742 * Interception preserves the invariant that at most one view can be 1743 * hovered at a time by transferring hover focus from the currently hovered 1744 * child to the view group or vice-versa as needed. 1745 * </p><p> 1746 * If this method returns <code>true</code> and a child is already hovered, then the 1747 * child view will first receive a hover exit event and then the view group 1748 * itself will receive a hover enter event in {@link #onHoverEvent}. 1749 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1750 * events and instead returns <code>false</code> while the pointer is hovering 1751 * within the bounds of one of a child, then the view group will first receive a 1752 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1753 * receive a hover enter event. 1754 * </p><p> 1755 * The default implementation always returns false. 1756 * </p> 1757 * 1758 * @param event The motion event that describes the hover. 1759 * @return True if the view group would like to intercept the hover event 1760 * and prevent its children from receiving it. 1761 */ 1762 public boolean onInterceptHoverEvent(MotionEvent event) { 1763 return false; 1764 } 1765 1766 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1767 if (event.getHistorySize() == 0) { 1768 return event; 1769 } 1770 return MotionEvent.obtainNoHistory(event); 1771 } 1772 1773 /** 1774 * {@inheritDoc} 1775 */ 1776 @Override 1777 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1778 // Send the event to the child under the pointer. 1779 final int childrenCount = mChildrenCount; 1780 if (childrenCount != 0) { 1781 final View[] children = mChildren; 1782 final float x = event.getX(); 1783 final float y = event.getY(); 1784 1785 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1786 for (int i = childrenCount - 1; i >= 0; i--) { 1787 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1788 final View child = children[childIndex]; 1789 if (!canViewReceivePointerEvents(child) 1790 || !isTransformedTouchPointInView(x, y, child, null)) { 1791 continue; 1792 } 1793 1794 if (dispatchTransformedGenericPointerEvent(event, child)) { 1795 return true; 1796 } 1797 } 1798 } 1799 1800 // No child handled the event. Send it to this view group. 1801 return super.dispatchGenericPointerEvent(event); 1802 } 1803 1804 /** 1805 * {@inheritDoc} 1806 */ 1807 @Override 1808 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1809 // Send the event to the focused child or to this view group if it has focus. 1810 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1811 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1812 return super.dispatchGenericFocusedEvent(event); 1813 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1814 == PFLAG_HAS_BOUNDS) { 1815 return mFocused.dispatchGenericMotionEvent(event); 1816 } 1817 return false; 1818 } 1819 1820 /** 1821 * Dispatches a generic pointer event to a child, taking into account 1822 * transformations that apply to the child. 1823 * 1824 * @param event The event to send. 1825 * @param child The view to send the event to. 1826 * @return {@code true} if the child handled the event. 1827 */ 1828 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1829 final float offsetX = mScrollX - child.mLeft; 1830 final float offsetY = mScrollY - child.mTop; 1831 1832 boolean handled; 1833 if (!child.hasIdentityMatrix()) { 1834 MotionEvent transformedEvent = MotionEvent.obtain(event); 1835 transformedEvent.offsetLocation(offsetX, offsetY); 1836 transformedEvent.transform(child.getInverseMatrix()); 1837 handled = child.dispatchGenericMotionEvent(transformedEvent); 1838 transformedEvent.recycle(); 1839 } else { 1840 event.offsetLocation(offsetX, offsetY); 1841 handled = child.dispatchGenericMotionEvent(event); 1842 event.offsetLocation(-offsetX, -offsetY); 1843 } 1844 return handled; 1845 } 1846 1847 /** 1848 * {@inheritDoc} 1849 */ 1850 @Override 1851 public boolean dispatchTouchEvent(MotionEvent ev) { 1852 if (mInputEventConsistencyVerifier != null) { 1853 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1854 } 1855 1856 boolean handled = false; 1857 if (onFilterTouchEventForSecurity(ev)) { 1858 final int action = ev.getAction(); 1859 final int actionMasked = action & MotionEvent.ACTION_MASK; 1860 1861 // Handle an initial down. 1862 if (actionMasked == MotionEvent.ACTION_DOWN) { 1863 // Throw away all previous state when starting a new touch gesture. 1864 // The framework may have dropped the up or cancel event for the previous gesture 1865 // due to an app switch, ANR, or some other state change. 1866 cancelAndClearTouchTargets(ev); 1867 resetTouchState(); 1868 } 1869 1870 // Check for interception. 1871 final boolean intercepted; 1872 if (actionMasked == MotionEvent.ACTION_DOWN 1873 || mFirstTouchTarget != null) { 1874 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1875 if (!disallowIntercept) { 1876 intercepted = onInterceptTouchEvent(ev); 1877 ev.setAction(action); // restore action in case it was changed 1878 } else { 1879 intercepted = false; 1880 } 1881 } else { 1882 // There are no touch targets and this action is not an initial down 1883 // so this view group continues to intercept touches. 1884 intercepted = true; 1885 } 1886 1887 // Check for cancelation. 1888 final boolean canceled = resetCancelNextUpFlag(this) 1889 || actionMasked == MotionEvent.ACTION_CANCEL; 1890 1891 // Update list of touch targets for pointer down, if needed. 1892 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1893 TouchTarget newTouchTarget = null; 1894 boolean alreadyDispatchedToNewTouchTarget = false; 1895 if (!canceled && !intercepted) { 1896 if (actionMasked == MotionEvent.ACTION_DOWN 1897 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1898 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1899 final int actionIndex = ev.getActionIndex(); // always 0 for down 1900 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1901 : TouchTarget.ALL_POINTER_IDS; 1902 1903 // Clean up earlier touch targets for this pointer id in case they 1904 // have become out of sync. 1905 removePointersFromTouchTargets(idBitsToAssign); 1906 1907 final int childrenCount = mChildrenCount; 1908 if (newTouchTarget == null && childrenCount != 0) { 1909 final float x = ev.getX(actionIndex); 1910 final float y = ev.getY(actionIndex); 1911 // Find a child that can receive the event. 1912 // Scan children from front to back. 1913 final View[] children = mChildren; 1914 1915 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1916 for (int i = childrenCount - 1; i >= 0; i--) { 1917 final int childIndex = customOrder ? 1918 getChildDrawingOrder(childrenCount, i) : i; 1919 final View child = children[childIndex]; 1920 if (!canViewReceivePointerEvents(child) 1921 || !isTransformedTouchPointInView(x, y, child, null)) { 1922 continue; 1923 } 1924 1925 newTouchTarget = getTouchTarget(child); 1926 if (newTouchTarget != null) { 1927 // Child is already receiving touch within its bounds. 1928 // Give it the new pointer in addition to the ones it is handling. 1929 newTouchTarget.pointerIdBits |= idBitsToAssign; 1930 break; 1931 } 1932 1933 resetCancelNextUpFlag(child); 1934 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1935 // Child wants to receive touch within its bounds. 1936 mLastTouchDownTime = ev.getDownTime(); 1937 mLastTouchDownIndex = childIndex; 1938 mLastTouchDownX = ev.getX(); 1939 mLastTouchDownY = ev.getY(); 1940 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1941 alreadyDispatchedToNewTouchTarget = true; 1942 break; 1943 } 1944 } 1945 } 1946 1947 if (newTouchTarget == null && mFirstTouchTarget != null) { 1948 // Did not find a child to receive the event. 1949 // Assign the pointer to the least recently added target. 1950 newTouchTarget = mFirstTouchTarget; 1951 while (newTouchTarget.next != null) { 1952 newTouchTarget = newTouchTarget.next; 1953 } 1954 newTouchTarget.pointerIdBits |= idBitsToAssign; 1955 } 1956 } 1957 } 1958 1959 // Dispatch to touch targets. 1960 if (mFirstTouchTarget == null) { 1961 // No touch targets so treat this as an ordinary view. 1962 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1963 TouchTarget.ALL_POINTER_IDS); 1964 } else { 1965 // Dispatch to touch targets, excluding the new touch target if we already 1966 // dispatched to it. Cancel touch targets if necessary. 1967 TouchTarget predecessor = null; 1968 TouchTarget target = mFirstTouchTarget; 1969 while (target != null) { 1970 final TouchTarget next = target.next; 1971 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1972 handled = true; 1973 } else { 1974 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1975 || intercepted; 1976 if (dispatchTransformedTouchEvent(ev, cancelChild, 1977 target.child, target.pointerIdBits)) { 1978 handled = true; 1979 } 1980 if (cancelChild) { 1981 if (predecessor == null) { 1982 mFirstTouchTarget = next; 1983 } else { 1984 predecessor.next = next; 1985 } 1986 target.recycle(); 1987 target = next; 1988 continue; 1989 } 1990 } 1991 predecessor = target; 1992 target = next; 1993 } 1994 } 1995 1996 // Update list of touch targets for pointer up or cancel, if needed. 1997 if (canceled 1998 || actionMasked == MotionEvent.ACTION_UP 1999 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2000 resetTouchState(); 2001 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2002 final int actionIndex = ev.getActionIndex(); 2003 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2004 removePointersFromTouchTargets(idBitsToRemove); 2005 } 2006 } 2007 2008 if (!handled && mInputEventConsistencyVerifier != null) { 2009 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2010 } 2011 return handled; 2012 } 2013 2014 /** 2015 * Resets all touch state in preparation for a new cycle. 2016 */ 2017 private void resetTouchState() { 2018 clearTouchTargets(); 2019 resetCancelNextUpFlag(this); 2020 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2021 } 2022 2023 /** 2024 * Resets the cancel next up flag. 2025 * Returns true if the flag was previously set. 2026 */ 2027 private static boolean resetCancelNextUpFlag(View view) { 2028 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2029 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2030 return true; 2031 } 2032 return false; 2033 } 2034 2035 /** 2036 * Clears all touch targets. 2037 */ 2038 private void clearTouchTargets() { 2039 TouchTarget target = mFirstTouchTarget; 2040 if (target != null) { 2041 do { 2042 TouchTarget next = target.next; 2043 target.recycle(); 2044 target = next; 2045 } while (target != null); 2046 mFirstTouchTarget = null; 2047 } 2048 } 2049 2050 /** 2051 * Cancels and clears all touch targets. 2052 */ 2053 private void cancelAndClearTouchTargets(MotionEvent event) { 2054 if (mFirstTouchTarget != null) { 2055 boolean syntheticEvent = false; 2056 if (event == null) { 2057 final long now = SystemClock.uptimeMillis(); 2058 event = MotionEvent.obtain(now, now, 2059 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2060 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2061 syntheticEvent = true; 2062 } 2063 2064 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2065 resetCancelNextUpFlag(target.child); 2066 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2067 } 2068 clearTouchTargets(); 2069 2070 if (syntheticEvent) { 2071 event.recycle(); 2072 } 2073 } 2074 } 2075 2076 /** 2077 * Gets the touch target for specified child view. 2078 * Returns null if not found. 2079 */ 2080 private TouchTarget getTouchTarget(View child) { 2081 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2082 if (target.child == child) { 2083 return target; 2084 } 2085 } 2086 return null; 2087 } 2088 2089 /** 2090 * Adds a touch target for specified child to the beginning of the list. 2091 * Assumes the target child is not already present. 2092 */ 2093 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2094 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2095 target.next = mFirstTouchTarget; 2096 mFirstTouchTarget = target; 2097 return target; 2098 } 2099 2100 /** 2101 * Removes the pointer ids from consideration. 2102 */ 2103 private void removePointersFromTouchTargets(int pointerIdBits) { 2104 TouchTarget predecessor = null; 2105 TouchTarget target = mFirstTouchTarget; 2106 while (target != null) { 2107 final TouchTarget next = target.next; 2108 if ((target.pointerIdBits & pointerIdBits) != 0) { 2109 target.pointerIdBits &= ~pointerIdBits; 2110 if (target.pointerIdBits == 0) { 2111 if (predecessor == null) { 2112 mFirstTouchTarget = next; 2113 } else { 2114 predecessor.next = next; 2115 } 2116 target.recycle(); 2117 target = next; 2118 continue; 2119 } 2120 } 2121 predecessor = target; 2122 target = next; 2123 } 2124 } 2125 2126 private void cancelTouchTarget(View view) { 2127 TouchTarget predecessor = null; 2128 TouchTarget target = mFirstTouchTarget; 2129 while (target != null) { 2130 final TouchTarget next = target.next; 2131 if (target.child == view) { 2132 if (predecessor == null) { 2133 mFirstTouchTarget = next; 2134 } else { 2135 predecessor.next = next; 2136 } 2137 target.recycle(); 2138 2139 final long now = SystemClock.uptimeMillis(); 2140 MotionEvent event = MotionEvent.obtain(now, now, 2141 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2142 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2143 view.dispatchTouchEvent(event); 2144 event.recycle(); 2145 return; 2146 } 2147 predecessor = target; 2148 target = next; 2149 } 2150 } 2151 2152 /** 2153 * Returns true if a child view can receive pointer events. 2154 * @hide 2155 */ 2156 private static boolean canViewReceivePointerEvents(View child) { 2157 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2158 || child.getAnimation() != null; 2159 } 2160 2161 /** 2162 * Returns true if a child view contains the specified point when transformed 2163 * into its coordinate space. 2164 * Child must not be null. 2165 * @hide 2166 */ 2167 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2168 PointF outLocalPoint) { 2169 float localX = x + mScrollX - child.mLeft; 2170 float localY = y + mScrollY - child.mTop; 2171 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2172 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2173 localXY[0] = localX; 2174 localXY[1] = localY; 2175 child.getInverseMatrix().mapPoints(localXY); 2176 localX = localXY[0]; 2177 localY = localXY[1]; 2178 } 2179 final boolean isInView = child.pointInView(localX, localY); 2180 if (isInView && outLocalPoint != null) { 2181 outLocalPoint.set(localX, localY); 2182 } 2183 return isInView; 2184 } 2185 2186 /** 2187 * Transforms a motion event into the coordinate space of a particular child view, 2188 * filters out irrelevant pointer ids, and overrides its action if necessary. 2189 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2190 */ 2191 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2192 View child, int desiredPointerIdBits) { 2193 final boolean handled; 2194 2195 // Canceling motions is a special case. We don't need to perform any transformations 2196 // or filtering. The important part is the action, not the contents. 2197 final int oldAction = event.getAction(); 2198 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2199 event.setAction(MotionEvent.ACTION_CANCEL); 2200 if (child == null) { 2201 handled = super.dispatchTouchEvent(event); 2202 } else { 2203 handled = child.dispatchTouchEvent(event); 2204 } 2205 event.setAction(oldAction); 2206 return handled; 2207 } 2208 2209 // Calculate the number of pointers to deliver. 2210 final int oldPointerIdBits = event.getPointerIdBits(); 2211 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2212 2213 // If for some reason we ended up in an inconsistent state where it looks like we 2214 // might produce a motion event with no pointers in it, then drop the event. 2215 if (newPointerIdBits == 0) { 2216 return false; 2217 } 2218 2219 // If the number of pointers is the same and we don't need to perform any fancy 2220 // irreversible transformations, then we can reuse the motion event for this 2221 // dispatch as long as we are careful to revert any changes we make. 2222 // Otherwise we need to make a copy. 2223 final MotionEvent transformedEvent; 2224 if (newPointerIdBits == oldPointerIdBits) { 2225 if (child == null || child.hasIdentityMatrix()) { 2226 if (child == null) { 2227 handled = super.dispatchTouchEvent(event); 2228 } else { 2229 final float offsetX = mScrollX - child.mLeft; 2230 final float offsetY = mScrollY - child.mTop; 2231 event.offsetLocation(offsetX, offsetY); 2232 2233 handled = child.dispatchTouchEvent(event); 2234 2235 event.offsetLocation(-offsetX, -offsetY); 2236 } 2237 return handled; 2238 } 2239 transformedEvent = MotionEvent.obtain(event); 2240 } else { 2241 transformedEvent = event.split(newPointerIdBits); 2242 } 2243 2244 // Perform any necessary transformations and dispatch. 2245 if (child == null) { 2246 handled = super.dispatchTouchEvent(transformedEvent); 2247 } else { 2248 final float offsetX = mScrollX - child.mLeft; 2249 final float offsetY = mScrollY - child.mTop; 2250 transformedEvent.offsetLocation(offsetX, offsetY); 2251 if (! child.hasIdentityMatrix()) { 2252 transformedEvent.transform(child.getInverseMatrix()); 2253 } 2254 2255 handled = child.dispatchTouchEvent(transformedEvent); 2256 } 2257 2258 // Done. 2259 transformedEvent.recycle(); 2260 return handled; 2261 } 2262 2263 /** 2264 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2265 * dispatch. This behavior is enabled by default for applications that target an 2266 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2267 * 2268 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2269 * views depending on where each pointer initially went down. This allows for user interactions 2270 * such as scrolling two panes of content independently, chording of buttons, and performing 2271 * independent gestures on different pieces of content. 2272 * 2273 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2274 * child views. <code>false</code> to only allow one child view to be the target of 2275 * any MotionEvent received by this ViewGroup. 2276 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2277 */ 2278 public void setMotionEventSplittingEnabled(boolean split) { 2279 // TODO Applications really shouldn't change this setting mid-touch event, 2280 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2281 // with gestures in progress when this is changed. 2282 if (split) { 2283 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2284 } else { 2285 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2286 } 2287 } 2288 2289 /** 2290 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2291 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2292 */ 2293 public boolean isMotionEventSplittingEnabled() { 2294 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2295 } 2296 2297 /** 2298 * Returns true if this ViewGroup should be considered as a single entity for removal 2299 * when executing an Activity transition. If this is false, child elements will move 2300 * individually during the transition. 2301 * @return True if the ViewGroup should be acted on together during an Activity transition. 2302 * The default value is false when the background is null and true when the background 2303 * is not null. 2304 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.os.Bundle) 2305 */ 2306 public boolean isTransitionGroup() { 2307 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2308 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2309 } else { 2310 return getBackground() != null; 2311 } 2312 } 2313 2314 /** 2315 * Changes whether or not this ViewGroup should be treated as a single entity during 2316 * ActivityTransitions. 2317 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2318 * in Activity transitions. If false, the ViewGroup won't transition, 2319 * only its children. If true, the entire ViewGroup will transition 2320 * together. 2321 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.os.Bundle) 2322 */ 2323 public void setTransitionGroup(boolean isTransitionGroup) { 2324 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2325 if (isTransitionGroup) { 2326 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2327 } else { 2328 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2329 } 2330 } 2331 2332 /** 2333 * {@inheritDoc} 2334 */ 2335 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2336 2337 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2338 // We're already in this state, assume our ancestors are too 2339 return; 2340 } 2341 2342 if (disallowIntercept) { 2343 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2344 } else { 2345 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2346 } 2347 2348 // Pass it up to our parent 2349 if (mParent != null) { 2350 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2351 } 2352 } 2353 2354 /** 2355 * Implement this method to intercept all touch screen motion events. This 2356 * allows you to watch events as they are dispatched to your children, and 2357 * take ownership of the current gesture at any point. 2358 * 2359 * <p>Using this function takes some care, as it has a fairly complicated 2360 * interaction with {@link View#onTouchEvent(MotionEvent) 2361 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2362 * that method as well as this one in the correct way. Events will be 2363 * received in the following order: 2364 * 2365 * <ol> 2366 * <li> You will receive the down event here. 2367 * <li> The down event will be handled either by a child of this view 2368 * group, or given to your own onTouchEvent() method to handle; this means 2369 * you should implement onTouchEvent() to return true, so you will 2370 * continue to see the rest of the gesture (instead of looking for 2371 * a parent view to handle it). Also, by returning true from 2372 * onTouchEvent(), you will not receive any following 2373 * events in onInterceptTouchEvent() and all touch processing must 2374 * happen in onTouchEvent() like normal. 2375 * <li> For as long as you return false from this function, each following 2376 * event (up to and including the final up) will be delivered first here 2377 * and then to the target's onTouchEvent(). 2378 * <li> If you return true from here, you will not receive any 2379 * following events: the target view will receive the same event but 2380 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2381 * events will be delivered to your onTouchEvent() method and no longer 2382 * appear here. 2383 * </ol> 2384 * 2385 * @param ev The motion event being dispatched down the hierarchy. 2386 * @return Return true to steal motion events from the children and have 2387 * them dispatched to this ViewGroup through onTouchEvent(). 2388 * The current target will receive an ACTION_CANCEL event, and no further 2389 * messages will be delivered here. 2390 */ 2391 public boolean onInterceptTouchEvent(MotionEvent ev) { 2392 return false; 2393 } 2394 2395 /** 2396 * {@inheritDoc} 2397 * 2398 * Looks for a view to give focus to respecting the setting specified by 2399 * {@link #getDescendantFocusability()}. 2400 * 2401 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2402 * find focus within the children of this group when appropriate. 2403 * 2404 * @see #FOCUS_BEFORE_DESCENDANTS 2405 * @see #FOCUS_AFTER_DESCENDANTS 2406 * @see #FOCUS_BLOCK_DESCENDANTS 2407 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2408 */ 2409 @Override 2410 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2411 if (DBG) { 2412 System.out.println(this + " ViewGroup.requestFocus direction=" 2413 + direction); 2414 } 2415 int descendantFocusability = getDescendantFocusability(); 2416 2417 switch (descendantFocusability) { 2418 case FOCUS_BLOCK_DESCENDANTS: 2419 return super.requestFocus(direction, previouslyFocusedRect); 2420 case FOCUS_BEFORE_DESCENDANTS: { 2421 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2422 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2423 } 2424 case FOCUS_AFTER_DESCENDANTS: { 2425 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2426 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2427 } 2428 default: 2429 throw new IllegalStateException("descendant focusability must be " 2430 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2431 + "but is " + descendantFocusability); 2432 } 2433 } 2434 2435 /** 2436 * Look for a descendant to call {@link View#requestFocus} on. 2437 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2438 * when it wants to request focus within its children. Override this to 2439 * customize how your {@link ViewGroup} requests focus within its children. 2440 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2441 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2442 * to give a finer grained hint about where focus is coming from. May be null 2443 * if there is no hint. 2444 * @return Whether focus was taken. 2445 */ 2446 @SuppressWarnings({"ConstantConditions"}) 2447 protected boolean onRequestFocusInDescendants(int direction, 2448 Rect previouslyFocusedRect) { 2449 int index; 2450 int increment; 2451 int end; 2452 int count = mChildrenCount; 2453 if ((direction & FOCUS_FORWARD) != 0) { 2454 index = 0; 2455 increment = 1; 2456 end = count; 2457 } else { 2458 index = count - 1; 2459 increment = -1; 2460 end = -1; 2461 } 2462 final View[] children = mChildren; 2463 for (int i = index; i != end; i += increment) { 2464 View child = children[i]; 2465 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2466 if (child.requestFocus(direction, previouslyFocusedRect)) { 2467 return true; 2468 } 2469 } 2470 } 2471 return false; 2472 } 2473 2474 /** 2475 * {@inheritDoc} 2476 * 2477 * @hide 2478 */ 2479 @Override 2480 public void dispatchStartTemporaryDetach() { 2481 super.dispatchStartTemporaryDetach(); 2482 final int count = mChildrenCount; 2483 final View[] children = mChildren; 2484 for (int i = 0; i < count; i++) { 2485 children[i].dispatchStartTemporaryDetach(); 2486 } 2487 } 2488 2489 /** 2490 * {@inheritDoc} 2491 * 2492 * @hide 2493 */ 2494 @Override 2495 public void dispatchFinishTemporaryDetach() { 2496 super.dispatchFinishTemporaryDetach(); 2497 final int count = mChildrenCount; 2498 final View[] children = mChildren; 2499 for (int i = 0; i < count; i++) { 2500 children[i].dispatchFinishTemporaryDetach(); 2501 } 2502 } 2503 2504 /** 2505 * {@inheritDoc} 2506 */ 2507 @Override 2508 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2509 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2510 super.dispatchAttachedToWindow(info, visibility); 2511 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2512 2513 final int count = mChildrenCount; 2514 final View[] children = mChildren; 2515 for (int i = 0; i < count; i++) { 2516 final View child = children[i]; 2517 child.dispatchAttachedToWindow(info, 2518 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2519 } 2520 } 2521 2522 @Override 2523 void dispatchScreenStateChanged(int screenState) { 2524 super.dispatchScreenStateChanged(screenState); 2525 2526 final int count = mChildrenCount; 2527 final View[] children = mChildren; 2528 for (int i = 0; i < count; i++) { 2529 children[i].dispatchScreenStateChanged(screenState); 2530 } 2531 } 2532 2533 @Override 2534 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2535 boolean handled = false; 2536 if (includeForAccessibility()) { 2537 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2538 if (handled) { 2539 return handled; 2540 } 2541 } 2542 // Let our children have a shot in populating the event. 2543 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2544 try { 2545 final int childCount = children.getChildCount(); 2546 for (int i = 0; i < childCount; i++) { 2547 View child = children.getChildAt(i); 2548 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2549 handled = child.dispatchPopulateAccessibilityEvent(event); 2550 if (handled) { 2551 return handled; 2552 } 2553 } 2554 } 2555 } finally { 2556 children.recycle(); 2557 } 2558 return false; 2559 } 2560 2561 @Override 2562 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2563 super.onInitializeAccessibilityNodeInfoInternal(info); 2564 if (mAttachInfo != null) { 2565 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2566 childrenForAccessibility.clear(); 2567 addChildrenForAccessibility(childrenForAccessibility); 2568 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2569 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2570 final View child = childrenForAccessibility.get(i); 2571 info.addChildUnchecked(child); 2572 } 2573 childrenForAccessibility.clear(); 2574 } 2575 } 2576 2577 @Override 2578 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2579 super.onInitializeAccessibilityEventInternal(event); 2580 event.setClassName(ViewGroup.class.getName()); 2581 } 2582 2583 @Override 2584 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2585 // If this is a live region, we should send a subtree change event 2586 // from this view. Otherwise, we can let it propagate up. 2587 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2588 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2589 } else if (mParent != null) { 2590 try { 2591 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2592 } catch (AbstractMethodError e) { 2593 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2594 " does not fully implement ViewParent", e); 2595 } 2596 } 2597 } 2598 2599 @Override 2600 void resetSubtreeAccessibilityStateChanged() { 2601 super.resetSubtreeAccessibilityStateChanged(); 2602 View[] children = mChildren; 2603 final int childCount = mChildrenCount; 2604 for (int i = 0; i < childCount; i++) { 2605 children[i].resetSubtreeAccessibilityStateChanged(); 2606 } 2607 } 2608 2609 /** 2610 * {@inheritDoc} 2611 */ 2612 @Override 2613 void dispatchDetachedFromWindow() { 2614 // If we still have a touch target, we are still in the process of 2615 // dispatching motion events to a child; we need to get rid of that 2616 // child to avoid dispatching events to it after the window is torn 2617 // down. To make sure we keep the child in a consistent state, we 2618 // first send it an ACTION_CANCEL motion event. 2619 cancelAndClearTouchTargets(null); 2620 2621 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2622 exitHoverTargets(); 2623 2624 // In case view is detached while transition is running 2625 mLayoutCalledWhileSuppressed = false; 2626 2627 // Tear down our drag tracking 2628 mDragNotifiedChildren = null; 2629 if (mCurrentDrag != null) { 2630 mCurrentDrag.recycle(); 2631 mCurrentDrag = null; 2632 } 2633 2634 final int count = mChildrenCount; 2635 final View[] children = mChildren; 2636 for (int i = 0; i < count; i++) { 2637 children[i].dispatchDetachedFromWindow(); 2638 } 2639 super.dispatchDetachedFromWindow(); 2640 } 2641 2642 /** 2643 * @hide 2644 */ 2645 @Override 2646 protected void internalSetPadding(int left, int top, int right, int bottom) { 2647 super.internalSetPadding(left, top, right, bottom); 2648 2649 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2650 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2651 } else { 2652 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2653 } 2654 } 2655 2656 /** 2657 * {@inheritDoc} 2658 */ 2659 @Override 2660 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2661 super.dispatchSaveInstanceState(container); 2662 final int count = mChildrenCount; 2663 final View[] children = mChildren; 2664 for (int i = 0; i < count; i++) { 2665 View c = children[i]; 2666 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2667 c.dispatchSaveInstanceState(container); 2668 } 2669 } 2670 } 2671 2672 /** 2673 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2674 * to only this view, not to its children. For use when overriding 2675 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2676 * subclasses to freeze their own state but not the state of their children. 2677 * 2678 * @param container the container 2679 */ 2680 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2681 super.dispatchSaveInstanceState(container); 2682 } 2683 2684 /** 2685 * {@inheritDoc} 2686 */ 2687 @Override 2688 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2689 super.dispatchRestoreInstanceState(container); 2690 final int count = mChildrenCount; 2691 final View[] children = mChildren; 2692 for (int i = 0; i < count; i++) { 2693 View c = children[i]; 2694 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2695 c.dispatchRestoreInstanceState(container); 2696 } 2697 } 2698 } 2699 2700 /** 2701 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2702 * to only this view, not to its children. For use when overriding 2703 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2704 * subclasses to thaw their own state but not the state of their children. 2705 * 2706 * @param container the container 2707 */ 2708 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2709 super.dispatchRestoreInstanceState(container); 2710 } 2711 2712 /** 2713 * Enables or disables the drawing cache for each child of this view group. 2714 * 2715 * @param enabled true to enable the cache, false to dispose of it 2716 */ 2717 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2718 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2719 final View[] children = mChildren; 2720 final int count = mChildrenCount; 2721 for (int i = 0; i < count; i++) { 2722 children[i].setDrawingCacheEnabled(enabled); 2723 } 2724 } 2725 } 2726 2727 @Override 2728 protected void onAnimationStart() { 2729 super.onAnimationStart(); 2730 2731 // When this ViewGroup's animation starts, build the cache for the children 2732 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2733 final int count = mChildrenCount; 2734 final View[] children = mChildren; 2735 final boolean buildCache = !isHardwareAccelerated(); 2736 2737 for (int i = 0; i < count; i++) { 2738 final View child = children[i]; 2739 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2740 child.setDrawingCacheEnabled(true); 2741 if (buildCache) { 2742 child.buildDrawingCache(true); 2743 } 2744 } 2745 } 2746 2747 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2748 } 2749 } 2750 2751 @Override 2752 protected void onAnimationEnd() { 2753 super.onAnimationEnd(); 2754 2755 // When this ViewGroup's animation ends, destroy the cache of the children 2756 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2757 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2758 2759 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2760 setChildrenDrawingCacheEnabled(false); 2761 } 2762 } 2763 } 2764 2765 @Override 2766 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2767 int count = mChildrenCount; 2768 int[] visibilities = null; 2769 2770 if (skipChildren) { 2771 visibilities = new int[count]; 2772 for (int i = 0; i < count; i++) { 2773 View child = getChildAt(i); 2774 visibilities[i] = child.getVisibility(); 2775 if (visibilities[i] == View.VISIBLE) { 2776 child.setVisibility(INVISIBLE); 2777 } 2778 } 2779 } 2780 2781 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2782 2783 if (skipChildren) { 2784 for (int i = 0; i < count; i++) { 2785 getChildAt(i).setVisibility(visibilities[i]); 2786 } 2787 } 2788 2789 return b; 2790 } 2791 2792 /** Return true if this ViewGroup is laying out using optical bounds. */ 2793 boolean isLayoutModeOptical() { 2794 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2795 } 2796 2797 Insets computeOpticalInsets() { 2798 if (isLayoutModeOptical()) { 2799 int left = 0; 2800 int top = 0; 2801 int right = 0; 2802 int bottom = 0; 2803 for (int i = 0; i < mChildrenCount; i++) { 2804 View child = getChildAt(i); 2805 if (child.getVisibility() == VISIBLE) { 2806 Insets insets = child.getOpticalInsets(); 2807 left = Math.max(left, insets.left); 2808 top = Math.max(top, insets.top); 2809 right = Math.max(right, insets.right); 2810 bottom = Math.max(bottom, insets.bottom); 2811 } 2812 } 2813 return Insets.of(left, top, right, bottom); 2814 } else { 2815 return Insets.NONE; 2816 } 2817 } 2818 2819 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2820 if (x1 != x2 && y1 != y2) { 2821 if (x1 > x2) { 2822 int tmp = x1; x1 = x2; x2 = tmp; 2823 } 2824 if (y1 > y2) { 2825 int tmp = y1; y1 = y2; y2 = tmp; 2826 } 2827 canvas.drawRect(x1, y1, x2, y2, paint); 2828 } 2829 } 2830 2831 private static int sign(int x) { 2832 return (x >= 0) ? 1 : -1; 2833 } 2834 2835 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2836 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2837 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2838 } 2839 2840 private int dipsToPixels(int dips) { 2841 float scale = getContext().getResources().getDisplayMetrics().density; 2842 return (int) (dips * scale + 0.5f); 2843 } 2844 2845 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2846 int lineLength, int lineWidth) { 2847 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2848 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2849 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2850 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2851 } 2852 2853 private static void fillDifference(Canvas canvas, 2854 int x2, int y2, int x3, int y3, 2855 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2856 int x1 = x2 - dx1; 2857 int y1 = y2 - dy1; 2858 2859 int x4 = x3 + dx2; 2860 int y4 = y3 + dy2; 2861 2862 fillRect(canvas, paint, x1, y1, x4, y2); 2863 fillRect(canvas, paint, x1, y2, x2, y3); 2864 fillRect(canvas, paint, x3, y2, x4, y3); 2865 fillRect(canvas, paint, x1, y3, x4, y4); 2866 } 2867 2868 /** 2869 * @hide 2870 */ 2871 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2872 for (int i = 0; i < getChildCount(); i++) { 2873 View c = getChildAt(i); 2874 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2875 } 2876 } 2877 2878 /** 2879 * @hide 2880 */ 2881 protected void onDebugDraw(Canvas canvas) { 2882 Paint paint = getDebugPaint(); 2883 2884 // Draw optical bounds 2885 { 2886 paint.setColor(Color.RED); 2887 paint.setStyle(Paint.Style.STROKE); 2888 2889 for (int i = 0; i < getChildCount(); i++) { 2890 View c = getChildAt(i); 2891 Insets insets = c.getOpticalInsets(); 2892 2893 drawRect(canvas, paint, 2894 c.getLeft() + insets.left, 2895 c.getTop() + insets.top, 2896 c.getRight() - insets.right - 1, 2897 c.getBottom() - insets.bottom - 1); 2898 } 2899 } 2900 2901 // Draw margins 2902 { 2903 paint.setColor(Color.argb(63, 255, 0, 255)); 2904 paint.setStyle(Paint.Style.FILL); 2905 2906 onDebugDrawMargins(canvas, paint); 2907 } 2908 2909 // Draw clip bounds 2910 { 2911 paint.setColor(Color.rgb(63, 127, 255)); 2912 paint.setStyle(Paint.Style.FILL); 2913 2914 int lineLength = dipsToPixels(8); 2915 int lineWidth = dipsToPixels(1); 2916 for (int i = 0; i < getChildCount(); i++) { 2917 View c = getChildAt(i); 2918 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2919 paint, lineLength, lineWidth); 2920 } 2921 } 2922 } 2923 2924 /** 2925 * {@inheritDoc} 2926 */ 2927 @Override 2928 protected void dispatchDraw(Canvas canvas) { 2929 final int count = mChildrenCount; 2930 final View[] children = mChildren; 2931 int flags = mGroupFlags; 2932 2933 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2934 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2935 2936 final boolean buildCache = !isHardwareAccelerated(); 2937 for (int i = 0; i < count; i++) { 2938 final View child = children[i]; 2939 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2940 final LayoutParams params = child.getLayoutParams(); 2941 attachLayoutAnimationParameters(child, params, i, count); 2942 bindLayoutAnimation(child); 2943 if (cache) { 2944 child.setDrawingCacheEnabled(true); 2945 if (buildCache) { 2946 child.buildDrawingCache(true); 2947 } 2948 } 2949 } 2950 } 2951 2952 final LayoutAnimationController controller = mLayoutAnimationController; 2953 if (controller.willOverlap()) { 2954 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2955 } 2956 2957 controller.start(); 2958 2959 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2960 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2961 2962 if (cache) { 2963 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2964 } 2965 2966 if (mAnimationListener != null) { 2967 mAnimationListener.onAnimationStart(controller.getAnimation()); 2968 } 2969 } 2970 2971 int saveCount = 0; 2972 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2973 if (clipToPadding) { 2974 saveCount = canvas.save(); 2975 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2976 mScrollX + mRight - mLeft - mPaddingRight, 2977 mScrollY + mBottom - mTop - mPaddingBottom); 2978 2979 } 2980 2981 // We will draw our child's animation, let's reset the flag 2982 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2983 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2984 2985 boolean more = false; 2986 final long drawingTime = getDrawingTime(); 2987 2988 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2989 for (int i = 0; i < count; i++) { 2990 final View child = children[i]; 2991 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2992 more |= drawChild(canvas, child, drawingTime); 2993 } 2994 } 2995 } else { 2996 for (int i = 0; i < count; i++) { 2997 final View child = children[getChildDrawingOrder(count, i)]; 2998 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2999 more |= drawChild(canvas, child, drawingTime); 3000 } 3001 } 3002 } 3003 3004 // Draw any disappearing views that have animations 3005 if (mDisappearingChildren != null) { 3006 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3007 final int disappearingCount = disappearingChildren.size() - 1; 3008 // Go backwards -- we may delete as animations finish 3009 for (int i = disappearingCount; i >= 0; i--) { 3010 final View child = disappearingChildren.get(i); 3011 more |= drawChild(canvas, child, drawingTime); 3012 } 3013 } 3014 3015 if (debugDraw()) { 3016 onDebugDraw(canvas); 3017 } 3018 3019 if (clipToPadding) { 3020 canvas.restoreToCount(saveCount); 3021 } 3022 3023 // mGroupFlags might have been updated by drawChild() 3024 flags = mGroupFlags; 3025 3026 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3027 invalidate(true); 3028 } 3029 3030 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3031 mLayoutAnimationController.isDone() && !more) { 3032 // We want to erase the drawing cache and notify the listener after the 3033 // next frame is drawn because one extra invalidate() is caused by 3034 // drawChild() after the animation is over 3035 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3036 final Runnable end = new Runnable() { 3037 public void run() { 3038 notifyAnimationListener(); 3039 } 3040 }; 3041 post(end); 3042 } 3043 } 3044 3045 /** 3046 * Returns the ViewGroupOverlay for this view group, creating it if it does 3047 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3048 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3049 * views, like overlay drawables, are visual-only; they do not receive input 3050 * events and should not be used as anything other than a temporary 3051 * representation of a view in a parent container, such as might be used 3052 * by an animation effect. 3053 * 3054 * <p>Note: Overlays do not currently work correctly with {@link 3055 * SurfaceView} or {@link TextureView}; contents in overlays for these 3056 * types of views may not display correctly.</p> 3057 * 3058 * @return The ViewGroupOverlay object for this view. 3059 * @see ViewGroupOverlay 3060 */ 3061 @Override 3062 public ViewGroupOverlay getOverlay() { 3063 if (mOverlay == null) { 3064 mOverlay = new ViewGroupOverlay(mContext, this); 3065 } 3066 return (ViewGroupOverlay) mOverlay; 3067 } 3068 3069 /** 3070 * Returns the index of the child to draw for this iteration. Override this 3071 * if you want to change the drawing order of children. By default, it 3072 * returns i. 3073 * <p> 3074 * NOTE: In order for this method to be called, you must enable child ordering 3075 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3076 * 3077 * @param i The current iteration. 3078 * @return The index of the child to draw this iteration. 3079 * 3080 * @see #setChildrenDrawingOrderEnabled(boolean) 3081 * @see #isChildrenDrawingOrderEnabled() 3082 */ 3083 protected int getChildDrawingOrder(int childCount, int i) { 3084 return i; 3085 } 3086 3087 private void notifyAnimationListener() { 3088 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3089 mGroupFlags |= FLAG_ANIMATION_DONE; 3090 3091 if (mAnimationListener != null) { 3092 final Runnable end = new Runnable() { 3093 public void run() { 3094 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3095 } 3096 }; 3097 post(end); 3098 } 3099 3100 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3101 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3102 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3103 setChildrenDrawingCacheEnabled(false); 3104 } 3105 } 3106 3107 invalidate(true); 3108 } 3109 3110 /** 3111 * This method is used to cause children of this ViewGroup to restore or recreate their 3112 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3113 * to recreate its own display list, which would happen if it went through the normal 3114 * draw/dispatchDraw mechanisms. 3115 * 3116 * @hide 3117 */ 3118 @Override 3119 protected void dispatchGetDisplayList() { 3120 final int count = mChildrenCount; 3121 final View[] children = mChildren; 3122 for (int i = 0; i < count; i++) { 3123 final View child = children[i]; 3124 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3125 child.hasStaticLayer()) { 3126 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3127 == PFLAG_INVALIDATED; 3128 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3129 child.getDisplayList(); 3130 child.mRecreateDisplayList = false; 3131 } 3132 } 3133 if (mOverlay != null) { 3134 View overlayView = mOverlay.getOverlayView(); 3135 overlayView.mRecreateDisplayList = (overlayView.mPrivateFlags & PFLAG_INVALIDATED) 3136 == PFLAG_INVALIDATED; 3137 overlayView.mPrivateFlags &= ~PFLAG_INVALIDATED; 3138 overlayView.getDisplayList(); 3139 overlayView.mRecreateDisplayList = false; 3140 } 3141 } 3142 3143 /** 3144 * Draw one child of this View Group. This method is responsible for getting 3145 * the canvas in the right state. This includes clipping, translating so 3146 * that the child's scrolled origin is at 0, 0, and applying any animation 3147 * transformations. 3148 * 3149 * @param canvas The canvas on which to draw the child 3150 * @param child Who to draw 3151 * @param drawingTime The time at which draw is occurring 3152 * @return True if an invalidate() was issued 3153 */ 3154 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3155 return child.draw(canvas, this, drawingTime); 3156 } 3157 3158 /** 3159 * Returns whether this group's descendents are drawn in their own 3160 * independent Z volume. Views drawn in one contained volume will not 3161 * interleave with views in another, even if their Z values are interleaved. 3162 * The default value is true. 3163 * @see #setIsolatedZVolume(boolean) 3164 * 3165 * @return True if the ViewGroup has an isolated Z volume. 3166 */ 3167 public boolean hasIsolatedZVolume() { 3168 return ((mGroupFlags & FLAG_ISOLATED_Z_VOLUME) != 0); 3169 } 3170 3171 /** 3172 * By default, only direct children of a group can interleave drawing order 3173 * by interleaving Z values. Set to false on individual groups to enable Z 3174 * interleaving of views that aren't direct siblings. 3175 * 3176 * @return True if the group should be an isolated Z volume with its own Z 3177 * ordering space, false if its decendents should inhabit the 3178 * inherited Z ordering volume. 3179 */ 3180 public void setIsolatedZVolume(boolean isolateZVolume) { 3181 boolean previousValue = (mGroupFlags & FLAG_ISOLATED_Z_VOLUME) == FLAG_ISOLATED_Z_VOLUME; 3182 if (isolateZVolume != previousValue) { 3183 setBooleanFlag(FLAG_ISOLATED_Z_VOLUME, isolateZVolume); 3184 if (mDisplayList != null) { 3185 mDisplayList.setIsolatedZVolume(isolateZVolume); 3186 } 3187 } 3188 } 3189 3190 /** 3191 * Returns whether this group's children are clipped to their bounds before drawing. 3192 * The default value is true. 3193 * @see #setClipChildren(boolean) 3194 * 3195 * @return True if the group's children will be clipped to their bounds, 3196 * false otherwise. 3197 */ 3198 public boolean getClipChildren() { 3199 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3200 } 3201 3202 /** 3203 * By default, children are clipped to their bounds before drawing. This 3204 * allows view groups to override this behavior for animations, etc. 3205 * 3206 * @param clipChildren true to clip children to their bounds, 3207 * false otherwise 3208 * @attr ref android.R.styleable#ViewGroup_clipChildren 3209 */ 3210 public void setClipChildren(boolean clipChildren) { 3211 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3212 if (clipChildren != previousValue) { 3213 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3214 for (int i = 0; i < mChildrenCount; ++i) { 3215 View child = getChildAt(i); 3216 if (child.mDisplayList != null) { 3217 child.mDisplayList.setClipToBounds(clipChildren); 3218 } 3219 } 3220 } 3221 } 3222 3223 /** 3224 * By default, children are clipped to the padding of the ViewGroup. This 3225 * allows view groups to override this behavior 3226 * 3227 * @param clipToPadding true to clip children to the padding of the 3228 * group, false otherwise 3229 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3230 */ 3231 public void setClipToPadding(boolean clipToPadding) { 3232 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3233 } 3234 3235 /** 3236 * {@inheritDoc} 3237 */ 3238 @Override 3239 public void dispatchSetSelected(boolean selected) { 3240 final View[] children = mChildren; 3241 final int count = mChildrenCount; 3242 for (int i = 0; i < count; i++) { 3243 children[i].setSelected(selected); 3244 } 3245 } 3246 3247 /** 3248 * {@inheritDoc} 3249 */ 3250 @Override 3251 public void dispatchSetActivated(boolean activated) { 3252 final View[] children = mChildren; 3253 final int count = mChildrenCount; 3254 for (int i = 0; i < count; i++) { 3255 children[i].setActivated(activated); 3256 } 3257 } 3258 3259 @Override 3260 protected void dispatchSetPressed(boolean pressed) { 3261 final View[] children = mChildren; 3262 final int count = mChildrenCount; 3263 for (int i = 0; i < count; i++) { 3264 final View child = children[i]; 3265 // Children that are clickable on their own should not 3266 // show a pressed state when their parent view does. 3267 // Clearing a pressed state always propagates. 3268 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3269 child.setPressed(pressed); 3270 } 3271 } 3272 } 3273 3274 @Override 3275 void dispatchCancelPendingInputEvents() { 3276 super.dispatchCancelPendingInputEvents(); 3277 3278 final View[] children = mChildren; 3279 final int count = mChildrenCount; 3280 for (int i = 0; i < count; i++) { 3281 children[i].dispatchCancelPendingInputEvents(); 3282 } 3283 } 3284 3285 /** 3286 * When this property is set to true, this ViewGroup supports static transformations on 3287 * children; this causes 3288 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3289 * invoked when a child is drawn. 3290 * 3291 * Any subclass overriding 3292 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3293 * set this property to true. 3294 * 3295 * @param enabled True to enable static transformations on children, false otherwise. 3296 * 3297 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3298 */ 3299 protected void setStaticTransformationsEnabled(boolean enabled) { 3300 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3301 } 3302 3303 /** 3304 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3305 * boolean to indicate whether a static transform was set. The default implementation 3306 * simply returns <code>false</code>; subclasses may override this method for different 3307 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3308 * for this method to be called. 3309 * 3310 * @param child The child view whose static transform is being requested 3311 * @param t The Transformation which will hold the result 3312 * @return true if the transformation was set, false otherwise 3313 * @see #setStaticTransformationsEnabled(boolean) 3314 */ 3315 protected boolean getChildStaticTransformation(View child, Transformation t) { 3316 return false; 3317 } 3318 3319 Transformation getChildTransformation() { 3320 if (mChildTransformation == null) { 3321 mChildTransformation = new Transformation(); 3322 } 3323 return mChildTransformation; 3324 } 3325 3326 /** 3327 * {@hide} 3328 */ 3329 @Override 3330 protected View findViewTraversal(int id) { 3331 if (id == mID) { 3332 return this; 3333 } 3334 3335 final View[] where = mChildren; 3336 final int len = mChildrenCount; 3337 3338 for (int i = 0; i < len; i++) { 3339 View v = where[i]; 3340 3341 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3342 v = v.findViewById(id); 3343 3344 if (v != null) { 3345 return v; 3346 } 3347 } 3348 } 3349 3350 return null; 3351 } 3352 3353 /** 3354 * {@hide} 3355 */ 3356 @Override 3357 protected View findViewWithTagTraversal(Object tag) { 3358 if (tag != null && tag.equals(mTag)) { 3359 return this; 3360 } 3361 3362 final View[] where = mChildren; 3363 final int len = mChildrenCount; 3364 3365 for (int i = 0; i < len; i++) { 3366 View v = where[i]; 3367 3368 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3369 v = v.findViewWithTag(tag); 3370 3371 if (v != null) { 3372 return v; 3373 } 3374 } 3375 } 3376 3377 return null; 3378 } 3379 3380 /** 3381 * {@hide} 3382 */ 3383 @Override 3384 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3385 if (predicate.apply(this)) { 3386 return this; 3387 } 3388 3389 final View[] where = mChildren; 3390 final int len = mChildrenCount; 3391 3392 for (int i = 0; i < len; i++) { 3393 View v = where[i]; 3394 3395 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3396 v = v.findViewByPredicate(predicate); 3397 3398 if (v != null) { 3399 return v; 3400 } 3401 } 3402 } 3403 3404 return null; 3405 } 3406 3407 /** 3408 * <p>Adds a child view. If no layout parameters are already set on the child, the 3409 * default parameters for this ViewGroup are set on the child.</p> 3410 * 3411 * <p><strong>Note:</strong> do not invoke this method from 3412 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3413 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3414 * 3415 * @param child the child view to add 3416 * 3417 * @see #generateDefaultLayoutParams() 3418 */ 3419 public void addView(View child) { 3420 addView(child, -1); 3421 } 3422 3423 /** 3424 * Adds a child view. If no layout parameters are already set on the child, the 3425 * default parameters for this ViewGroup are set on the child. 3426 * 3427 * <p><strong>Note:</strong> do not invoke this method from 3428 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3429 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3430 * 3431 * @param child the child view to add 3432 * @param index the position at which to add the child 3433 * 3434 * @see #generateDefaultLayoutParams() 3435 */ 3436 public void addView(View child, int index) { 3437 LayoutParams params = child.getLayoutParams(); 3438 if (params == null) { 3439 params = generateDefaultLayoutParams(); 3440 if (params == null) { 3441 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3442 } 3443 } 3444 addView(child, index, params); 3445 } 3446 3447 /** 3448 * Adds a child view with this ViewGroup's default layout parameters and the 3449 * specified width and height. 3450 * 3451 * <p><strong>Note:</strong> do not invoke this method from 3452 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3453 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3454 * 3455 * @param child the child view to add 3456 */ 3457 public void addView(View child, int width, int height) { 3458 final LayoutParams params = generateDefaultLayoutParams(); 3459 params.width = width; 3460 params.height = height; 3461 addView(child, -1, params); 3462 } 3463 3464 /** 3465 * Adds a child view with the specified layout parameters. 3466 * 3467 * <p><strong>Note:</strong> do not invoke this method from 3468 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3469 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3470 * 3471 * @param child the child view to add 3472 * @param params the layout parameters to set on the child 3473 */ 3474 public void addView(View child, LayoutParams params) { 3475 addView(child, -1, params); 3476 } 3477 3478 /** 3479 * Adds a child view with the specified layout parameters. 3480 * 3481 * <p><strong>Note:</strong> do not invoke this method from 3482 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3483 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3484 * 3485 * @param child the child view to add 3486 * @param index the position at which to add the child 3487 * @param params the layout parameters to set on the child 3488 */ 3489 public void addView(View child, int index, LayoutParams params) { 3490 if (DBG) { 3491 System.out.println(this + " addView"); 3492 } 3493 3494 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3495 // therefore, we call requestLayout() on ourselves before, so that the child's request 3496 // will be blocked at our level 3497 requestLayout(); 3498 invalidate(true); 3499 addViewInner(child, index, params, false); 3500 } 3501 3502 /** 3503 * {@inheritDoc} 3504 */ 3505 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3506 if (!checkLayoutParams(params)) { 3507 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3508 } 3509 if (view.mParent != this) { 3510 throw new IllegalArgumentException("Given view not a child of " + this); 3511 } 3512 view.setLayoutParams(params); 3513 } 3514 3515 /** 3516 * {@inheritDoc} 3517 */ 3518 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3519 return p != null; 3520 } 3521 3522 /** 3523 * Interface definition for a callback to be invoked when the hierarchy 3524 * within this view changed. The hierarchy changes whenever a child is added 3525 * to or removed from this view. 3526 */ 3527 public interface OnHierarchyChangeListener { 3528 /** 3529 * Called when a new child is added to a parent view. 3530 * 3531 * @param parent the view in which a child was added 3532 * @param child the new child view added in the hierarchy 3533 */ 3534 void onChildViewAdded(View parent, View child); 3535 3536 /** 3537 * Called when a child is removed from a parent view. 3538 * 3539 * @param parent the view from which the child was removed 3540 * @param child the child removed from the hierarchy 3541 */ 3542 void onChildViewRemoved(View parent, View child); 3543 } 3544 3545 /** 3546 * Register a callback to be invoked when a child is added to or removed 3547 * from this view. 3548 * 3549 * @param listener the callback to invoke on hierarchy change 3550 */ 3551 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3552 mOnHierarchyChangeListener = listener; 3553 } 3554 3555 /** 3556 * @hide 3557 */ 3558 protected void onViewAdded(View child) { 3559 if (mOnHierarchyChangeListener != null) { 3560 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3561 } 3562 } 3563 3564 /** 3565 * @hide 3566 */ 3567 protected void onViewRemoved(View child) { 3568 if (mOnHierarchyChangeListener != null) { 3569 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3570 } 3571 } 3572 3573 private void clearCachedLayoutMode() { 3574 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3575 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3576 } 3577 } 3578 3579 @Override 3580 protected void onAttachedToWindow() { 3581 super.onAttachedToWindow(); 3582 clearCachedLayoutMode(); 3583 } 3584 3585 @Override 3586 protected void onDetachedFromWindow() { 3587 super.onDetachedFromWindow(); 3588 clearCachedLayoutMode(); 3589 } 3590 3591 /** 3592 * Adds a view during layout. This is useful if in your onLayout() method, 3593 * you need to add more views (as does the list view for example). 3594 * 3595 * If index is negative, it means put it at the end of the list. 3596 * 3597 * @param child the view to add to the group 3598 * @param index the index at which the child must be added 3599 * @param params the layout parameters to associate with the child 3600 * @return true if the child was added, false otherwise 3601 */ 3602 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3603 return addViewInLayout(child, index, params, false); 3604 } 3605 3606 /** 3607 * Adds a view during layout. This is useful if in your onLayout() method, 3608 * you need to add more views (as does the list view for example). 3609 * 3610 * If index is negative, it means put it at the end of the list. 3611 * 3612 * @param child the view to add to the group 3613 * @param index the index at which the child must be added 3614 * @param params the layout parameters to associate with the child 3615 * @param preventRequestLayout if true, calling this method will not trigger a 3616 * layout request on child 3617 * @return true if the child was added, false otherwise 3618 */ 3619 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3620 boolean preventRequestLayout) { 3621 child.mParent = null; 3622 addViewInner(child, index, params, preventRequestLayout); 3623 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3624 return true; 3625 } 3626 3627 /** 3628 * Prevents the specified child to be laid out during the next layout pass. 3629 * 3630 * @param child the child on which to perform the cleanup 3631 */ 3632 protected void cleanupLayoutState(View child) { 3633 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3634 } 3635 3636 private void addViewInner(View child, int index, LayoutParams params, 3637 boolean preventRequestLayout) { 3638 3639 if (mTransition != null) { 3640 // Don't prevent other add transitions from completing, but cancel remove 3641 // transitions to let them complete the process before we add to the container 3642 mTransition.cancel(LayoutTransition.DISAPPEARING); 3643 } 3644 3645 if (child.getParent() != null) { 3646 throw new IllegalStateException("The specified child already has a parent. " + 3647 "You must call removeView() on the child's parent first."); 3648 } 3649 3650 if (mTransition != null) { 3651 mTransition.addChild(this, child); 3652 } 3653 3654 if (!checkLayoutParams(params)) { 3655 params = generateLayoutParams(params); 3656 } 3657 3658 if (preventRequestLayout) { 3659 child.mLayoutParams = params; 3660 } else { 3661 child.setLayoutParams(params); 3662 } 3663 3664 if (index < 0) { 3665 index = mChildrenCount; 3666 } 3667 3668 addInArray(child, index); 3669 3670 // tell our children 3671 if (preventRequestLayout) { 3672 child.assignParent(this); 3673 } else { 3674 child.mParent = this; 3675 } 3676 3677 if (child.hasFocus()) { 3678 requestChildFocus(child, child.findFocus()); 3679 } 3680 3681 AttachInfo ai = mAttachInfo; 3682 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3683 boolean lastKeepOn = ai.mKeepScreenOn; 3684 ai.mKeepScreenOn = false; 3685 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3686 if (ai.mKeepScreenOn) { 3687 needGlobalAttributesUpdate(true); 3688 } 3689 ai.mKeepScreenOn = lastKeepOn; 3690 } 3691 3692 if (child.isLayoutDirectionInherited()) { 3693 child.resetRtlProperties(); 3694 } 3695 3696 onViewAdded(child); 3697 3698 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3699 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3700 } 3701 3702 if (child.hasTransientState()) { 3703 childHasTransientStateChanged(child, true); 3704 } 3705 3706 if (child.isImportantForAccessibility() && child.getVisibility() != View.GONE) { 3707 notifySubtreeAccessibilityStateChangedIfNeeded(); 3708 } 3709 } 3710 3711 private void addInArray(View child, int index) { 3712 View[] children = mChildren; 3713 final int count = mChildrenCount; 3714 final int size = children.length; 3715 if (index == count) { 3716 if (size == count) { 3717 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3718 System.arraycopy(children, 0, mChildren, 0, size); 3719 children = mChildren; 3720 } 3721 children[mChildrenCount++] = child; 3722 } else if (index < count) { 3723 if (size == count) { 3724 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3725 System.arraycopy(children, 0, mChildren, 0, index); 3726 System.arraycopy(children, index, mChildren, index + 1, count - index); 3727 children = mChildren; 3728 } else { 3729 System.arraycopy(children, index, children, index + 1, count - index); 3730 } 3731 children[index] = child; 3732 mChildrenCount++; 3733 if (mLastTouchDownIndex >= index) { 3734 mLastTouchDownIndex++; 3735 } 3736 } else { 3737 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3738 } 3739 } 3740 3741 // This method also sets the child's mParent to null 3742 private void removeFromArray(int index) { 3743 final View[] children = mChildren; 3744 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3745 children[index].mParent = null; 3746 } 3747 final int count = mChildrenCount; 3748 if (index == count - 1) { 3749 children[--mChildrenCount] = null; 3750 } else if (index >= 0 && index < count) { 3751 System.arraycopy(children, index + 1, children, index, count - index - 1); 3752 children[--mChildrenCount] = null; 3753 } else { 3754 throw new IndexOutOfBoundsException(); 3755 } 3756 if (mLastTouchDownIndex == index) { 3757 mLastTouchDownTime = 0; 3758 mLastTouchDownIndex = -1; 3759 } else if (mLastTouchDownIndex > index) { 3760 mLastTouchDownIndex--; 3761 } 3762 } 3763 3764 // This method also sets the children's mParent to null 3765 private void removeFromArray(int start, int count) { 3766 final View[] children = mChildren; 3767 final int childrenCount = mChildrenCount; 3768 3769 start = Math.max(0, start); 3770 final int end = Math.min(childrenCount, start + count); 3771 3772 if (start == end) { 3773 return; 3774 } 3775 3776 if (end == childrenCount) { 3777 for (int i = start; i < end; i++) { 3778 children[i].mParent = null; 3779 children[i] = null; 3780 } 3781 } else { 3782 for (int i = start; i < end; i++) { 3783 children[i].mParent = null; 3784 } 3785 3786 // Since we're looping above, we might as well do the copy, but is arraycopy() 3787 // faster than the extra 2 bounds checks we would do in the loop? 3788 System.arraycopy(children, end, children, start, childrenCount - end); 3789 3790 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3791 children[i] = null; 3792 } 3793 } 3794 3795 mChildrenCount -= (end - start); 3796 } 3797 3798 private void bindLayoutAnimation(View child) { 3799 Animation a = mLayoutAnimationController.getAnimationForView(child); 3800 child.setAnimation(a); 3801 } 3802 3803 /** 3804 * Subclasses should override this method to set layout animation 3805 * parameters on the supplied child. 3806 * 3807 * @param child the child to associate with animation parameters 3808 * @param params the child's layout parameters which hold the animation 3809 * parameters 3810 * @param index the index of the child in the view group 3811 * @param count the number of children in the view group 3812 */ 3813 protected void attachLayoutAnimationParameters(View child, 3814 LayoutParams params, int index, int count) { 3815 LayoutAnimationController.AnimationParameters animationParams = 3816 params.layoutAnimationParameters; 3817 if (animationParams == null) { 3818 animationParams = new LayoutAnimationController.AnimationParameters(); 3819 params.layoutAnimationParameters = animationParams; 3820 } 3821 3822 animationParams.count = count; 3823 animationParams.index = index; 3824 } 3825 3826 /** 3827 * {@inheritDoc} 3828 * 3829 * <p><strong>Note:</strong> do not invoke this method from 3830 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3831 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3832 */ 3833 public void removeView(View view) { 3834 removeViewInternal(view); 3835 requestLayout(); 3836 invalidate(true); 3837 } 3838 3839 /** 3840 * Removes a view during layout. This is useful if in your onLayout() method, 3841 * you need to remove more views. 3842 * 3843 * <p><strong>Note:</strong> do not invoke this method from 3844 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3845 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3846 * 3847 * @param view the view to remove from the group 3848 */ 3849 public void removeViewInLayout(View view) { 3850 removeViewInternal(view); 3851 } 3852 3853 /** 3854 * Removes a range of views during layout. This is useful if in your onLayout() method, 3855 * you need to remove more views. 3856 * 3857 * <p><strong>Note:</strong> do not invoke this method from 3858 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3859 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3860 * 3861 * @param start the index of the first view to remove from the group 3862 * @param count the number of views to remove from the group 3863 */ 3864 public void removeViewsInLayout(int start, int count) { 3865 removeViewsInternal(start, count); 3866 } 3867 3868 /** 3869 * Removes the view at the specified position in the group. 3870 * 3871 * <p><strong>Note:</strong> do not invoke this method from 3872 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3873 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3874 * 3875 * @param index the position in the group of the view to remove 3876 */ 3877 public void removeViewAt(int index) { 3878 removeViewInternal(index, getChildAt(index)); 3879 requestLayout(); 3880 invalidate(true); 3881 } 3882 3883 /** 3884 * Removes the specified range of views from the group. 3885 * 3886 * <p><strong>Note:</strong> do not invoke this method from 3887 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3888 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3889 * 3890 * @param start the first position in the group of the range of views to remove 3891 * @param count the number of views to remove 3892 */ 3893 public void removeViews(int start, int count) { 3894 removeViewsInternal(start, count); 3895 requestLayout(); 3896 invalidate(true); 3897 } 3898 3899 private void removeViewInternal(View view) { 3900 final int index = indexOfChild(view); 3901 if (index >= 0) { 3902 removeViewInternal(index, view); 3903 } 3904 } 3905 3906 private void removeViewInternal(int index, View view) { 3907 3908 if (mTransition != null) { 3909 mTransition.removeChild(this, view); 3910 } 3911 3912 boolean clearChildFocus = false; 3913 if (view == mFocused) { 3914 view.unFocus(null); 3915 clearChildFocus = true; 3916 } 3917 3918 if (view.isAccessibilityFocused()) { 3919 view.clearAccessibilityFocus(); 3920 } 3921 3922 cancelTouchTarget(view); 3923 cancelHoverTarget(view); 3924 3925 if (view.getAnimation() != null || 3926 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3927 addDisappearingView(view); 3928 } else if (view.mAttachInfo != null) { 3929 view.dispatchDetachedFromWindow(); 3930 } 3931 3932 if (view.hasTransientState()) { 3933 childHasTransientStateChanged(view, false); 3934 } 3935 3936 needGlobalAttributesUpdate(false); 3937 3938 removeFromArray(index); 3939 3940 if (clearChildFocus) { 3941 clearChildFocus(view); 3942 if (!rootViewRequestFocus()) { 3943 notifyGlobalFocusCleared(this); 3944 } 3945 } 3946 3947 onViewRemoved(view); 3948 3949 if (view.isImportantForAccessibility() && view.getVisibility() != View.GONE) { 3950 notifySubtreeAccessibilityStateChangedIfNeeded(); 3951 } 3952 } 3953 3954 /** 3955 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3956 * not null, changes in layout which occur because of children being added to or removed from 3957 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3958 * object. By default, the transition object is null (so layout changes are not animated). 3959 * 3960 * <p>Replacing a non-null transition will cause that previous transition to be 3961 * canceled, if it is currently running, to restore this container to 3962 * its correct post-transition state.</p> 3963 * 3964 * @param transition The LayoutTransition object that will animated changes in layout. A value 3965 * of <code>null</code> means no transition will run on layout changes. 3966 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3967 */ 3968 public void setLayoutTransition(LayoutTransition transition) { 3969 if (mTransition != null) { 3970 LayoutTransition previousTransition = mTransition; 3971 previousTransition.cancel(); 3972 previousTransition.removeTransitionListener(mLayoutTransitionListener); 3973 } 3974 mTransition = transition; 3975 if (mTransition != null) { 3976 mTransition.addTransitionListener(mLayoutTransitionListener); 3977 } 3978 } 3979 3980 /** 3981 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3982 * not null, changes in layout which occur because of children being added to or removed from 3983 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3984 * object. By default, the transition object is null (so layout changes are not animated). 3985 * 3986 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3987 * A value of <code>null</code> means no transition will run on layout changes. 3988 */ 3989 public LayoutTransition getLayoutTransition() { 3990 return mTransition; 3991 } 3992 3993 private void removeViewsInternal(int start, int count) { 3994 final View focused = mFocused; 3995 final boolean detach = mAttachInfo != null; 3996 boolean clearChildFocus = false; 3997 3998 final View[] children = mChildren; 3999 final int end = start + count; 4000 4001 for (int i = start; i < end; i++) { 4002 final View view = children[i]; 4003 4004 if (mTransition != null) { 4005 mTransition.removeChild(this, view); 4006 } 4007 4008 if (view == focused) { 4009 view.unFocus(null); 4010 clearChildFocus = true; 4011 } 4012 4013 if (view.isAccessibilityFocused()) { 4014 view.clearAccessibilityFocus(); 4015 } 4016 4017 cancelTouchTarget(view); 4018 cancelHoverTarget(view); 4019 4020 if (view.getAnimation() != null || 4021 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4022 addDisappearingView(view); 4023 } else if (detach) { 4024 view.dispatchDetachedFromWindow(); 4025 } 4026 4027 if (view.hasTransientState()) { 4028 childHasTransientStateChanged(view, false); 4029 } 4030 4031 needGlobalAttributesUpdate(false); 4032 4033 onViewRemoved(view); 4034 } 4035 4036 removeFromArray(start, count); 4037 4038 if (clearChildFocus) { 4039 clearChildFocus(focused); 4040 if (!rootViewRequestFocus()) { 4041 notifyGlobalFocusCleared(focused); 4042 } 4043 } 4044 } 4045 4046 /** 4047 * Call this method to remove all child views from the 4048 * ViewGroup. 4049 * 4050 * <p><strong>Note:</strong> do not invoke this method from 4051 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4052 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4053 */ 4054 public void removeAllViews() { 4055 removeAllViewsInLayout(); 4056 requestLayout(); 4057 invalidate(true); 4058 } 4059 4060 /** 4061 * Called by a ViewGroup subclass to remove child views from itself, 4062 * when it must first know its size on screen before it can calculate how many 4063 * child views it will render. An example is a Gallery or a ListView, which 4064 * may "have" 50 children, but actually only render the number of children 4065 * that can currently fit inside the object on screen. Do not call 4066 * this method unless you are extending ViewGroup and understand the 4067 * view measuring and layout pipeline. 4068 * 4069 * <p><strong>Note:</strong> do not invoke this method from 4070 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4071 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4072 */ 4073 public void removeAllViewsInLayout() { 4074 final int count = mChildrenCount; 4075 if (count <= 0) { 4076 return; 4077 } 4078 4079 final View[] children = mChildren; 4080 mChildrenCount = 0; 4081 4082 final View focused = mFocused; 4083 final boolean detach = mAttachInfo != null; 4084 boolean clearChildFocus = false; 4085 4086 needGlobalAttributesUpdate(false); 4087 4088 for (int i = count - 1; i >= 0; i--) { 4089 final View view = children[i]; 4090 4091 if (mTransition != null) { 4092 mTransition.removeChild(this, view); 4093 } 4094 4095 if (view == focused) { 4096 view.unFocus(null); 4097 clearChildFocus = true; 4098 } 4099 4100 if (view.isAccessibilityFocused()) { 4101 view.clearAccessibilityFocus(); 4102 } 4103 4104 cancelTouchTarget(view); 4105 cancelHoverTarget(view); 4106 4107 if (view.getAnimation() != null || 4108 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4109 addDisappearingView(view); 4110 } else if (detach) { 4111 view.dispatchDetachedFromWindow(); 4112 } 4113 4114 if (view.hasTransientState()) { 4115 childHasTransientStateChanged(view, false); 4116 } 4117 4118 onViewRemoved(view); 4119 4120 view.mParent = null; 4121 children[i] = null; 4122 } 4123 4124 if (clearChildFocus) { 4125 clearChildFocus(focused); 4126 if (!rootViewRequestFocus()) { 4127 notifyGlobalFocusCleared(focused); 4128 } 4129 } 4130 } 4131 4132 /** 4133 * Finishes the removal of a detached view. This method will dispatch the detached from 4134 * window event and notify the hierarchy change listener. 4135 * <p> 4136 * This method is intended to be lightweight and makes no assumptions about whether the 4137 * parent or child should be redrawn. Proper use of this method will include also making 4138 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4139 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4140 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4141 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4142 * 4143 * @param child the child to be definitely removed from the view hierarchy 4144 * @param animate if true and the view has an animation, the view is placed in the 4145 * disappearing views list, otherwise, it is detached from the window 4146 * 4147 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4148 * @see #detachAllViewsFromParent() 4149 * @see #detachViewFromParent(View) 4150 * @see #detachViewFromParent(int) 4151 */ 4152 protected void removeDetachedView(View child, boolean animate) { 4153 if (mTransition != null) { 4154 mTransition.removeChild(this, child); 4155 } 4156 4157 if (child == mFocused) { 4158 child.clearFocus(); 4159 } 4160 4161 child.clearAccessibilityFocus(); 4162 4163 cancelTouchTarget(child); 4164 cancelHoverTarget(child); 4165 4166 if ((animate && child.getAnimation() != null) || 4167 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4168 addDisappearingView(child); 4169 } else if (child.mAttachInfo != null) { 4170 child.dispatchDetachedFromWindow(); 4171 } 4172 4173 if (child.hasTransientState()) { 4174 childHasTransientStateChanged(child, false); 4175 } 4176 4177 onViewRemoved(child); 4178 } 4179 4180 /** 4181 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4182 * sets the layout parameters and puts the view in the list of children so that 4183 * it can be retrieved by calling {@link #getChildAt(int)}. 4184 * <p> 4185 * This method is intended to be lightweight and makes no assumptions about whether the 4186 * parent or child should be redrawn. Proper use of this method will include also making 4187 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4188 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4189 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4190 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4191 * <p> 4192 * This method should be called only for views which were detached from their parent. 4193 * 4194 * @param child the child to attach 4195 * @param index the index at which the child should be attached 4196 * @param params the layout parameters of the child 4197 * 4198 * @see #removeDetachedView(View, boolean) 4199 * @see #detachAllViewsFromParent() 4200 * @see #detachViewFromParent(View) 4201 * @see #detachViewFromParent(int) 4202 */ 4203 protected void attachViewToParent(View child, int index, LayoutParams params) { 4204 child.mLayoutParams = params; 4205 4206 if (index < 0) { 4207 index = mChildrenCount; 4208 } 4209 4210 addInArray(child, index); 4211 4212 child.mParent = this; 4213 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4214 & ~PFLAG_DRAWING_CACHE_VALID) 4215 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4216 this.mPrivateFlags |= PFLAG_INVALIDATED; 4217 4218 if (child.hasFocus()) { 4219 requestChildFocus(child, child.findFocus()); 4220 } 4221 } 4222 4223 /** 4224 * Detaches a view from its parent. Detaching a view should be followed 4225 * either by a call to 4226 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4227 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4228 * temporary; reattachment or removal should happen within the same drawing cycle as 4229 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4230 * call to {@link #getChildAt(int)}. 4231 * 4232 * @param child the child to detach 4233 * 4234 * @see #detachViewFromParent(int) 4235 * @see #detachViewsFromParent(int, int) 4236 * @see #detachAllViewsFromParent() 4237 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4238 * @see #removeDetachedView(View, boolean) 4239 */ 4240 protected void detachViewFromParent(View child) { 4241 removeFromArray(indexOfChild(child)); 4242 } 4243 4244 /** 4245 * Detaches a view from its parent. Detaching a view should be followed 4246 * either by a call to 4247 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4248 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4249 * temporary; reattachment or removal should happen within the same drawing cycle as 4250 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4251 * call to {@link #getChildAt(int)}. 4252 * 4253 * @param index the index of the child to detach 4254 * 4255 * @see #detachViewFromParent(View) 4256 * @see #detachAllViewsFromParent() 4257 * @see #detachViewsFromParent(int, int) 4258 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4259 * @see #removeDetachedView(View, boolean) 4260 */ 4261 protected void detachViewFromParent(int index) { 4262 removeFromArray(index); 4263 } 4264 4265 /** 4266 * Detaches a range of views from their parents. Detaching a view should be followed 4267 * either by a call to 4268 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4269 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4270 * temporary; reattachment or removal should happen within the same drawing cycle as 4271 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4272 * call to {@link #getChildAt(int)}. 4273 * 4274 * @param start the first index of the childrend range to detach 4275 * @param count the number of children to detach 4276 * 4277 * @see #detachViewFromParent(View) 4278 * @see #detachViewFromParent(int) 4279 * @see #detachAllViewsFromParent() 4280 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4281 * @see #removeDetachedView(View, boolean) 4282 */ 4283 protected void detachViewsFromParent(int start, int count) { 4284 removeFromArray(start, count); 4285 } 4286 4287 /** 4288 * Detaches all views from the parent. Detaching a view should be followed 4289 * either by a call to 4290 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4291 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4292 * temporary; reattachment or removal should happen within the same drawing cycle as 4293 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4294 * call to {@link #getChildAt(int)}. 4295 * 4296 * @see #detachViewFromParent(View) 4297 * @see #detachViewFromParent(int) 4298 * @see #detachViewsFromParent(int, int) 4299 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4300 * @see #removeDetachedView(View, boolean) 4301 */ 4302 protected void detachAllViewsFromParent() { 4303 final int count = mChildrenCount; 4304 if (count <= 0) { 4305 return; 4306 } 4307 4308 final View[] children = mChildren; 4309 mChildrenCount = 0; 4310 4311 for (int i = count - 1; i >= 0; i--) { 4312 children[i].mParent = null; 4313 children[i] = null; 4314 } 4315 } 4316 4317 /** 4318 * Don't call or override this method. It is used for the implementation of 4319 * the view hierarchy. 4320 */ 4321 public final void invalidateChild(View child, final Rect dirty) { 4322 ViewParent parent = this; 4323 4324 final AttachInfo attachInfo = mAttachInfo; 4325 if (attachInfo != null) { 4326 // If the child is drawing an animation, we want to copy this flag onto 4327 // ourselves and the parent to make sure the invalidate request goes 4328 // through 4329 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4330 == PFLAG_DRAW_ANIMATION; 4331 4332 // Check whether the child that requests the invalidate is fully opaque 4333 // Views being animated or transformed are not considered opaque because we may 4334 // be invalidating their old position and need the parent to paint behind them. 4335 Matrix childMatrix = child.getMatrix(); 4336 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4337 child.getAnimation() == null && childMatrix.isIdentity(); 4338 // Mark the child as dirty, using the appropriate flag 4339 // Make sure we do not set both flags at the same time 4340 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4341 4342 if (child.mLayerType != LAYER_TYPE_NONE) { 4343 mPrivateFlags |= PFLAG_INVALIDATED; 4344 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4345 child.mLocalDirtyRect.union(dirty); 4346 } 4347 4348 final int[] location = attachInfo.mInvalidateChildLocation; 4349 location[CHILD_LEFT_INDEX] = child.mLeft; 4350 location[CHILD_TOP_INDEX] = child.mTop; 4351 if (!childMatrix.isIdentity() || 4352 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4353 RectF boundingRect = attachInfo.mTmpTransformRect; 4354 boundingRect.set(dirty); 4355 Matrix transformMatrix; 4356 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4357 Transformation t = attachInfo.mTmpTransformation; 4358 boolean transformed = getChildStaticTransformation(child, t); 4359 if (transformed) { 4360 transformMatrix = attachInfo.mTmpMatrix; 4361 transformMatrix.set(t.getMatrix()); 4362 if (!childMatrix.isIdentity()) { 4363 transformMatrix.preConcat(childMatrix); 4364 } 4365 } else { 4366 transformMatrix = childMatrix; 4367 } 4368 } else { 4369 transformMatrix = childMatrix; 4370 } 4371 transformMatrix.mapRect(boundingRect); 4372 dirty.set((int) (boundingRect.left - 0.5f), 4373 (int) (boundingRect.top - 0.5f), 4374 (int) (boundingRect.right + 0.5f), 4375 (int) (boundingRect.bottom + 0.5f)); 4376 } 4377 4378 do { 4379 View view = null; 4380 if (parent instanceof View) { 4381 view = (View) parent; 4382 } 4383 4384 if (drawAnimation) { 4385 if (view != null) { 4386 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4387 } else if (parent instanceof ViewRootImpl) { 4388 ((ViewRootImpl) parent).mIsAnimating = true; 4389 } 4390 } 4391 4392 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4393 // flag coming from the child that initiated the invalidate 4394 if (view != null) { 4395 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4396 view.getSolidColor() == 0) { 4397 opaqueFlag = PFLAG_DIRTY; 4398 } 4399 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4400 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4401 } 4402 } 4403 4404 parent = parent.invalidateChildInParent(location, dirty); 4405 if (view != null) { 4406 // Account for transform on current parent 4407 Matrix m = view.getMatrix(); 4408 if (!m.isIdentity()) { 4409 RectF boundingRect = attachInfo.mTmpTransformRect; 4410 boundingRect.set(dirty); 4411 m.mapRect(boundingRect); 4412 dirty.set((int) (boundingRect.left - 0.5f), 4413 (int) (boundingRect.top - 0.5f), 4414 (int) (boundingRect.right + 0.5f), 4415 (int) (boundingRect.bottom + 0.5f)); 4416 } 4417 } 4418 } while (parent != null); 4419 } 4420 } 4421 4422 /** 4423 * Don't call or override this method. It is used for the implementation of 4424 * the view hierarchy. 4425 * 4426 * This implementation returns null if this ViewGroup does not have a parent, 4427 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4428 * does not intersect with this ViewGroup's bounds. 4429 */ 4430 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4431 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4432 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4433 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4434 FLAG_OPTIMIZE_INVALIDATE) { 4435 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4436 location[CHILD_TOP_INDEX] - mScrollY); 4437 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4438 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4439 } 4440 4441 final int left = mLeft; 4442 final int top = mTop; 4443 4444 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4445 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4446 dirty.setEmpty(); 4447 } 4448 } 4449 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4450 4451 location[CHILD_LEFT_INDEX] = left; 4452 location[CHILD_TOP_INDEX] = top; 4453 4454 if (mLayerType != LAYER_TYPE_NONE) { 4455 mPrivateFlags |= PFLAG_INVALIDATED; 4456 mLocalDirtyRect.union(dirty); 4457 } 4458 4459 return mParent; 4460 4461 } else { 4462 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4463 4464 location[CHILD_LEFT_INDEX] = mLeft; 4465 location[CHILD_TOP_INDEX] = mTop; 4466 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4467 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4468 } else { 4469 // in case the dirty rect extends outside the bounds of this container 4470 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4471 } 4472 4473 if (mLayerType != LAYER_TYPE_NONE) { 4474 mPrivateFlags |= PFLAG_INVALIDATED; 4475 mLocalDirtyRect.union(dirty); 4476 } 4477 4478 return mParent; 4479 } 4480 } 4481 4482 return null; 4483 } 4484 4485 /** 4486 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4487 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4488 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4489 * 4490 * @hide 4491 */ 4492 public void invalidateChildFast(View child, final Rect dirty) { 4493 ViewParent parent = this; 4494 4495 final AttachInfo attachInfo = mAttachInfo; 4496 if (attachInfo != null) { 4497 if (child.mLayerType != LAYER_TYPE_NONE) { 4498 child.mLocalDirtyRect.union(dirty); 4499 } 4500 4501 int left = child.mLeft; 4502 int top = child.mTop; 4503 if (!child.getMatrix().isIdentity()) { 4504 child.transformRect(dirty); 4505 } 4506 4507 do { 4508 if (parent instanceof ViewGroup) { 4509 ViewGroup parentVG = (ViewGroup) parent; 4510 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4511 // Layered parents should be recreated, not just re-issued 4512 parentVG.invalidate(); 4513 parent = null; 4514 } else { 4515 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4516 left = parentVG.mLeft; 4517 top = parentVG.mTop; 4518 } 4519 } else { 4520 // Reached the top; this calls into the usual invalidate method in 4521 // ViewRootImpl, which schedules a traversal 4522 final int[] location = attachInfo.mInvalidateChildLocation; 4523 location[0] = left; 4524 location[1] = top; 4525 parent = parent.invalidateChildInParent(location, dirty); 4526 } 4527 } while (parent != null); 4528 } 4529 } 4530 4531 /** 4532 * Quick invalidation method that simply transforms the dirty rect into the parent's 4533 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4534 * 4535 * @hide 4536 */ 4537 protected ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4538 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4539 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4540 dirty.offset(left - mScrollX, top - mScrollY); 4541 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4542 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4543 } 4544 4545 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4546 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4547 4548 if (mLayerType != LAYER_TYPE_NONE) { 4549 mLocalDirtyRect.union(dirty); 4550 } 4551 if (!getMatrix().isIdentity()) { 4552 transformRect(dirty); 4553 } 4554 4555 return mParent; 4556 } 4557 } 4558 4559 return null; 4560 } 4561 4562 /** 4563 * Offset a rectangle that is in a descendant's coordinate 4564 * space into our coordinate space. 4565 * @param descendant A descendant of this view 4566 * @param rect A rectangle defined in descendant's coordinate space. 4567 */ 4568 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4569 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4570 } 4571 4572 /** 4573 * Offset a rectangle that is in our coordinate space into an ancestor's 4574 * coordinate space. 4575 * @param descendant A descendant of this view 4576 * @param rect A rectangle defined in descendant's coordinate space. 4577 */ 4578 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4579 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4580 } 4581 4582 /** 4583 * Helper method that offsets a rect either from parent to descendant or 4584 * descendant to parent. 4585 */ 4586 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4587 boolean offsetFromChildToParent, boolean clipToBounds) { 4588 4589 // already in the same coord system :) 4590 if (descendant == this) { 4591 return; 4592 } 4593 4594 ViewParent theParent = descendant.mParent; 4595 4596 // search and offset up to the parent 4597 while ((theParent != null) 4598 && (theParent instanceof View) 4599 && (theParent != this)) { 4600 4601 if (offsetFromChildToParent) { 4602 rect.offset(descendant.mLeft - descendant.mScrollX, 4603 descendant.mTop - descendant.mScrollY); 4604 if (clipToBounds) { 4605 View p = (View) theParent; 4606 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4607 } 4608 } else { 4609 if (clipToBounds) { 4610 View p = (View) theParent; 4611 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4612 } 4613 rect.offset(descendant.mScrollX - descendant.mLeft, 4614 descendant.mScrollY - descendant.mTop); 4615 } 4616 4617 descendant = (View) theParent; 4618 theParent = descendant.mParent; 4619 } 4620 4621 // now that we are up to this view, need to offset one more time 4622 // to get into our coordinate space 4623 if (theParent == this) { 4624 if (offsetFromChildToParent) { 4625 rect.offset(descendant.mLeft - descendant.mScrollX, 4626 descendant.mTop - descendant.mScrollY); 4627 } else { 4628 rect.offset(descendant.mScrollX - descendant.mLeft, 4629 descendant.mScrollY - descendant.mTop); 4630 } 4631 } else { 4632 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4633 } 4634 } 4635 4636 /** 4637 * Offset the vertical location of all children of this view by the specified number of pixels. 4638 * 4639 * @param offset the number of pixels to offset 4640 * 4641 * @hide 4642 */ 4643 public void offsetChildrenTopAndBottom(int offset) { 4644 final int count = mChildrenCount; 4645 final View[] children = mChildren; 4646 boolean invalidate = false; 4647 4648 for (int i = 0; i < count; i++) { 4649 final View v = children[i]; 4650 v.mTop += offset; 4651 v.mBottom += offset; 4652 if (v.mDisplayList != null) { 4653 invalidate = true; 4654 v.mDisplayList.offsetTopAndBottom(offset); 4655 } 4656 } 4657 4658 if (invalidate) { 4659 invalidateViewProperty(false, false); 4660 } 4661 } 4662 4663 /** 4664 * {@inheritDoc} 4665 */ 4666 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4667 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4668 // but for some simple tests it can be useful. If we don't have attach info this 4669 // will allocate memory. 4670 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4671 rect.set(r); 4672 4673 if (!child.hasIdentityMatrix()) { 4674 child.getMatrix().mapRect(rect); 4675 } 4676 4677 int dx = child.mLeft - mScrollX; 4678 int dy = child.mTop - mScrollY; 4679 4680 rect.offset(dx, dy); 4681 4682 if (offset != null) { 4683 if (!child.hasIdentityMatrix()) { 4684 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4685 : new float[2]; 4686 position[0] = offset.x; 4687 position[1] = offset.y; 4688 child.getMatrix().mapPoints(position); 4689 offset.x = (int) (position[0] + 0.5f); 4690 offset.y = (int) (position[1] + 0.5f); 4691 } 4692 offset.x += dx; 4693 offset.y += dy; 4694 } 4695 4696 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4697 if (mParent == null) return true; 4698 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4699 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4700 return mParent.getChildVisibleRect(this, r, offset); 4701 } 4702 4703 return false; 4704 } 4705 4706 /** 4707 * {@inheritDoc} 4708 */ 4709 @Override 4710 public final void layout(int l, int t, int r, int b) { 4711 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 4712 if (mTransition != null) { 4713 mTransition.layoutChange(this); 4714 } 4715 super.layout(l, t, r, b); 4716 } else { 4717 // record the fact that we noop'd it; request layout when transition finishes 4718 mLayoutCalledWhileSuppressed = true; 4719 } 4720 } 4721 4722 /** 4723 * {@inheritDoc} 4724 */ 4725 @Override 4726 protected abstract void onLayout(boolean changed, 4727 int l, int t, int r, int b); 4728 4729 /** 4730 * Indicates whether the view group has the ability to animate its children 4731 * after the first layout. 4732 * 4733 * @return true if the children can be animated, false otherwise 4734 */ 4735 protected boolean canAnimate() { 4736 return mLayoutAnimationController != null; 4737 } 4738 4739 /** 4740 * Runs the layout animation. Calling this method triggers a relayout of 4741 * this view group. 4742 */ 4743 public void startLayoutAnimation() { 4744 if (mLayoutAnimationController != null) { 4745 mGroupFlags |= FLAG_RUN_ANIMATION; 4746 requestLayout(); 4747 } 4748 } 4749 4750 /** 4751 * Schedules the layout animation to be played after the next layout pass 4752 * of this view group. This can be used to restart the layout animation 4753 * when the content of the view group changes or when the activity is 4754 * paused and resumed. 4755 */ 4756 public void scheduleLayoutAnimation() { 4757 mGroupFlags |= FLAG_RUN_ANIMATION; 4758 } 4759 4760 /** 4761 * Sets the layout animation controller used to animate the group's 4762 * children after the first layout. 4763 * 4764 * @param controller the animation controller 4765 */ 4766 public void setLayoutAnimation(LayoutAnimationController controller) { 4767 mLayoutAnimationController = controller; 4768 if (mLayoutAnimationController != null) { 4769 mGroupFlags |= FLAG_RUN_ANIMATION; 4770 } 4771 } 4772 4773 /** 4774 * Returns the layout animation controller used to animate the group's 4775 * children. 4776 * 4777 * @return the current animation controller 4778 */ 4779 public LayoutAnimationController getLayoutAnimation() { 4780 return mLayoutAnimationController; 4781 } 4782 4783 /** 4784 * Indicates whether the children's drawing cache is used during a layout 4785 * animation. By default, the drawing cache is enabled but this will prevent 4786 * nested layout animations from working. To nest animations, you must disable 4787 * the cache. 4788 * 4789 * @return true if the animation cache is enabled, false otherwise 4790 * 4791 * @see #setAnimationCacheEnabled(boolean) 4792 * @see View#setDrawingCacheEnabled(boolean) 4793 */ 4794 @ViewDebug.ExportedProperty 4795 public boolean isAnimationCacheEnabled() { 4796 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4797 } 4798 4799 /** 4800 * Enables or disables the children's drawing cache during a layout animation. 4801 * By default, the drawing cache is enabled but this will prevent nested 4802 * layout animations from working. To nest animations, you must disable the 4803 * cache. 4804 * 4805 * @param enabled true to enable the animation cache, false otherwise 4806 * 4807 * @see #isAnimationCacheEnabled() 4808 * @see View#setDrawingCacheEnabled(boolean) 4809 */ 4810 public void setAnimationCacheEnabled(boolean enabled) { 4811 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4812 } 4813 4814 /** 4815 * Indicates whether this ViewGroup will always try to draw its children using their 4816 * drawing cache. By default this property is enabled. 4817 * 4818 * @return true if the animation cache is enabled, false otherwise 4819 * 4820 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4821 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4822 * @see View#setDrawingCacheEnabled(boolean) 4823 */ 4824 @ViewDebug.ExportedProperty(category = "drawing") 4825 public boolean isAlwaysDrawnWithCacheEnabled() { 4826 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4827 } 4828 4829 /** 4830 * Indicates whether this ViewGroup will always try to draw its children using their 4831 * drawing cache. This property can be set to true when the cache rendering is 4832 * slightly different from the children's normal rendering. Renderings can be different, 4833 * for instance, when the cache's quality is set to low. 4834 * 4835 * When this property is disabled, the ViewGroup will use the drawing cache of its 4836 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4837 * when to start using the drawing cache and when to stop using it. 4838 * 4839 * @param always true to always draw with the drawing cache, false otherwise 4840 * 4841 * @see #isAlwaysDrawnWithCacheEnabled() 4842 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4843 * @see View#setDrawingCacheEnabled(boolean) 4844 * @see View#setDrawingCacheQuality(int) 4845 */ 4846 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4847 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4848 } 4849 4850 /** 4851 * Indicates whether the ViewGroup is currently drawing its children using 4852 * their drawing cache. 4853 * 4854 * @return true if children should be drawn with their cache, false otherwise 4855 * 4856 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4857 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4858 */ 4859 @ViewDebug.ExportedProperty(category = "drawing") 4860 protected boolean isChildrenDrawnWithCacheEnabled() { 4861 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4862 } 4863 4864 /** 4865 * Tells the ViewGroup to draw its children using their drawing cache. This property 4866 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4867 * will be used only if it has been enabled. 4868 * 4869 * Subclasses should call this method to start and stop using the drawing cache when 4870 * they perform performance sensitive operations, like scrolling or animating. 4871 * 4872 * @param enabled true if children should be drawn with their cache, false otherwise 4873 * 4874 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4875 * @see #isChildrenDrawnWithCacheEnabled() 4876 */ 4877 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4878 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4879 } 4880 4881 /** 4882 * Indicates whether the ViewGroup is drawing its children in the order defined by 4883 * {@link #getChildDrawingOrder(int, int)}. 4884 * 4885 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4886 * false otherwise 4887 * 4888 * @see #setChildrenDrawingOrderEnabled(boolean) 4889 * @see #getChildDrawingOrder(int, int) 4890 */ 4891 @ViewDebug.ExportedProperty(category = "drawing") 4892 protected boolean isChildrenDrawingOrderEnabled() { 4893 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4894 } 4895 4896 /** 4897 * Tells the ViewGroup whether to draw its children in the order defined by the method 4898 * {@link #getChildDrawingOrder(int, int)}. 4899 * 4900 * @param enabled true if the order of the children when drawing is determined by 4901 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4902 * 4903 * @see #isChildrenDrawingOrderEnabled() 4904 * @see #getChildDrawingOrder(int, int) 4905 */ 4906 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4907 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4908 } 4909 4910 private boolean hasBooleanFlag(int flag) { 4911 return (mGroupFlags & flag) == flag; 4912 } 4913 4914 private void setBooleanFlag(int flag, boolean value) { 4915 if (value) { 4916 mGroupFlags |= flag; 4917 } else { 4918 mGroupFlags &= ~flag; 4919 } 4920 } 4921 4922 /** 4923 * Returns an integer indicating what types of drawing caches are kept in memory. 4924 * 4925 * @see #setPersistentDrawingCache(int) 4926 * @see #setAnimationCacheEnabled(boolean) 4927 * 4928 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4929 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4930 * and {@link #PERSISTENT_ALL_CACHES} 4931 */ 4932 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4933 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4934 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4935 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4936 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4937 }) 4938 public int getPersistentDrawingCache() { 4939 return mPersistentDrawingCache; 4940 } 4941 4942 /** 4943 * Indicates what types of drawing caches should be kept in memory after 4944 * they have been created. 4945 * 4946 * @see #getPersistentDrawingCache() 4947 * @see #setAnimationCacheEnabled(boolean) 4948 * 4949 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4950 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4951 * and {@link #PERSISTENT_ALL_CACHES} 4952 */ 4953 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4954 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4955 } 4956 4957 private void setLayoutMode(int layoutMode, boolean explicitly) { 4958 mLayoutMode = layoutMode; 4959 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4960 } 4961 4962 /** 4963 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4964 * descendants that had inherited a different layoutMode from a previous parent. 4965 * Recursion terminates when a descendant's mode is: 4966 * <ul> 4967 * <li>Undefined</li> 4968 * <li>The same as the root node's</li> 4969 * <li>A mode that had been explicitly set</li> 4970 * <ul/> 4971 * The first two clauses are optimizations. 4972 * @param layoutModeOfRoot 4973 */ 4974 @Override 4975 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4976 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4977 mLayoutMode == layoutModeOfRoot || 4978 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4979 return; 4980 } 4981 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4982 4983 // apply recursively 4984 for (int i = 0, N = getChildCount(); i < N; i++) { 4985 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4986 } 4987 } 4988 4989 /** 4990 * Returns the basis of alignment during layout operations on this ViewGroup: 4991 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4992 * <p> 4993 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4994 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4995 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4996 * 4997 * @return the layout mode to use during layout operations 4998 * 4999 * @see #setLayoutMode(int) 5000 */ 5001 public int getLayoutMode() { 5002 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5003 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5004 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5005 setLayoutMode(inheritedLayoutMode, false); 5006 } 5007 return mLayoutMode; 5008 } 5009 5010 /** 5011 * Sets the basis of alignment during the layout of this ViewGroup. 5012 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5013 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5014 * 5015 * @param layoutMode the layout mode to use during layout operations 5016 * 5017 * @see #getLayoutMode() 5018 * @attr ref android.R.styleable#ViewGroup_layoutMode 5019 */ 5020 public void setLayoutMode(int layoutMode) { 5021 if (mLayoutMode != layoutMode) { 5022 invalidateInheritedLayoutMode(layoutMode); 5023 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5024 requestLayout(); 5025 } 5026 } 5027 5028 /** 5029 * Returns a new set of layout parameters based on the supplied attributes set. 5030 * 5031 * @param attrs the attributes to build the layout parameters from 5032 * 5033 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5034 * of its descendants 5035 */ 5036 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5037 return new LayoutParams(getContext(), attrs); 5038 } 5039 5040 /** 5041 * Returns a safe set of layout parameters based on the supplied layout params. 5042 * When a ViewGroup is passed a View whose layout params do not pass the test of 5043 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5044 * is invoked. This method should return a new set of layout params suitable for 5045 * this ViewGroup, possibly by copying the appropriate attributes from the 5046 * specified set of layout params. 5047 * 5048 * @param p The layout parameters to convert into a suitable set of layout parameters 5049 * for this ViewGroup. 5050 * 5051 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5052 * of its descendants 5053 */ 5054 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5055 return p; 5056 } 5057 5058 /** 5059 * Returns a set of default layout parameters. These parameters are requested 5060 * when the View passed to {@link #addView(View)} has no layout parameters 5061 * already set. If null is returned, an exception is thrown from addView. 5062 * 5063 * @return a set of default layout parameters or null 5064 */ 5065 protected LayoutParams generateDefaultLayoutParams() { 5066 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5067 } 5068 5069 /** 5070 * {@inheritDoc} 5071 */ 5072 @Override 5073 protected void debug(int depth) { 5074 super.debug(depth); 5075 String output; 5076 5077 if (mFocused != null) { 5078 output = debugIndent(depth); 5079 output += "mFocused"; 5080 Log.d(VIEW_LOG_TAG, output); 5081 } 5082 if (mChildrenCount != 0) { 5083 output = debugIndent(depth); 5084 output += "{"; 5085 Log.d(VIEW_LOG_TAG, output); 5086 } 5087 int count = mChildrenCount; 5088 for (int i = 0; i < count; i++) { 5089 View child = mChildren[i]; 5090 child.debug(depth + 1); 5091 } 5092 5093 if (mChildrenCount != 0) { 5094 output = debugIndent(depth); 5095 output += "}"; 5096 Log.d(VIEW_LOG_TAG, output); 5097 } 5098 } 5099 5100 /** 5101 * Returns the position in the group of the specified child view. 5102 * 5103 * @param child the view for which to get the position 5104 * @return a positive integer representing the position of the view in the 5105 * group, or -1 if the view does not exist in the group 5106 */ 5107 public int indexOfChild(View child) { 5108 final int count = mChildrenCount; 5109 final View[] children = mChildren; 5110 for (int i = 0; i < count; i++) { 5111 if (children[i] == child) { 5112 return i; 5113 } 5114 } 5115 return -1; 5116 } 5117 5118 /** 5119 * Returns the number of children in the group. 5120 * 5121 * @return a positive integer representing the number of children in 5122 * the group 5123 */ 5124 public int getChildCount() { 5125 return mChildrenCount; 5126 } 5127 5128 /** 5129 * Returns the view at the specified position in the group. 5130 * 5131 * @param index the position at which to get the view from 5132 * @return the view at the specified position or null if the position 5133 * does not exist within the group 5134 */ 5135 public View getChildAt(int index) { 5136 if (index < 0 || index >= mChildrenCount) { 5137 return null; 5138 } 5139 return mChildren[index]; 5140 } 5141 5142 /** 5143 * Ask all of the children of this view to measure themselves, taking into 5144 * account both the MeasureSpec requirements for this view and its padding. 5145 * We skip children that are in the GONE state The heavy lifting is done in 5146 * getChildMeasureSpec. 5147 * 5148 * @param widthMeasureSpec The width requirements for this view 5149 * @param heightMeasureSpec The height requirements for this view 5150 */ 5151 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5152 final int size = mChildrenCount; 5153 final View[] children = mChildren; 5154 for (int i = 0; i < size; ++i) { 5155 final View child = children[i]; 5156 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5157 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5158 } 5159 } 5160 } 5161 5162 /** 5163 * Ask one of the children of this view to measure itself, taking into 5164 * account both the MeasureSpec requirements for this view and its padding. 5165 * The heavy lifting is done in getChildMeasureSpec. 5166 * 5167 * @param child The child to measure 5168 * @param parentWidthMeasureSpec The width requirements for this view 5169 * @param parentHeightMeasureSpec The height requirements for this view 5170 */ 5171 protected void measureChild(View child, int parentWidthMeasureSpec, 5172 int parentHeightMeasureSpec) { 5173 final LayoutParams lp = child.getLayoutParams(); 5174 5175 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5176 mPaddingLeft + mPaddingRight, lp.width); 5177 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5178 mPaddingTop + mPaddingBottom, lp.height); 5179 5180 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5181 } 5182 5183 /** 5184 * Ask one of the children of this view to measure itself, taking into 5185 * account both the MeasureSpec requirements for this view and its padding 5186 * and margins. The child must have MarginLayoutParams The heavy lifting is 5187 * done in getChildMeasureSpec. 5188 * 5189 * @param child The child to measure 5190 * @param parentWidthMeasureSpec The width requirements for this view 5191 * @param widthUsed Extra space that has been used up by the parent 5192 * horizontally (possibly by other children of the parent) 5193 * @param parentHeightMeasureSpec The height requirements for this view 5194 * @param heightUsed Extra space that has been used up by the parent 5195 * vertically (possibly by other children of the parent) 5196 */ 5197 protected void measureChildWithMargins(View child, 5198 int parentWidthMeasureSpec, int widthUsed, 5199 int parentHeightMeasureSpec, int heightUsed) { 5200 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5201 5202 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5203 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5204 + widthUsed, lp.width); 5205 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5206 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5207 + heightUsed, lp.height); 5208 5209 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5210 } 5211 5212 /** 5213 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5214 * pass to a particular child. This method figures out the right MeasureSpec 5215 * for one dimension (height or width) of one child view. 5216 * 5217 * The goal is to combine information from our MeasureSpec with the 5218 * LayoutParams of the child to get the best possible results. For example, 5219 * if the this view knows its size (because its MeasureSpec has a mode of 5220 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5221 * to be the same size as the parent, the parent should ask the child to 5222 * layout given an exact size. 5223 * 5224 * @param spec The requirements for this view 5225 * @param padding The padding of this view for the current dimension and 5226 * margins, if applicable 5227 * @param childDimension How big the child wants to be in the current 5228 * dimension 5229 * @return a MeasureSpec integer for the child 5230 */ 5231 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5232 int specMode = MeasureSpec.getMode(spec); 5233 int specSize = MeasureSpec.getSize(spec); 5234 5235 int size = Math.max(0, specSize - padding); 5236 5237 int resultSize = 0; 5238 int resultMode = 0; 5239 5240 switch (specMode) { 5241 // Parent has imposed an exact size on us 5242 case MeasureSpec.EXACTLY: 5243 if (childDimension >= 0) { 5244 resultSize = childDimension; 5245 resultMode = MeasureSpec.EXACTLY; 5246 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5247 // Child wants to be our size. So be it. 5248 resultSize = size; 5249 resultMode = MeasureSpec.EXACTLY; 5250 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5251 // Child wants to determine its own size. It can't be 5252 // bigger than us. 5253 resultSize = size; 5254 resultMode = MeasureSpec.AT_MOST; 5255 } 5256 break; 5257 5258 // Parent has imposed a maximum size on us 5259 case MeasureSpec.AT_MOST: 5260 if (childDimension >= 0) { 5261 // Child wants a specific size... so be it 5262 resultSize = childDimension; 5263 resultMode = MeasureSpec.EXACTLY; 5264 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5265 // Child wants to be our size, but our size is not fixed. 5266 // Constrain child to not be bigger than us. 5267 resultSize = size; 5268 resultMode = MeasureSpec.AT_MOST; 5269 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5270 // Child wants to determine its own size. It can't be 5271 // bigger than us. 5272 resultSize = size; 5273 resultMode = MeasureSpec.AT_MOST; 5274 } 5275 break; 5276 5277 // Parent asked to see how big we want to be 5278 case MeasureSpec.UNSPECIFIED: 5279 if (childDimension >= 0) { 5280 // Child wants a specific size... let him have it 5281 resultSize = childDimension; 5282 resultMode = MeasureSpec.EXACTLY; 5283 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5284 // Child wants to be our size... find out how big it should 5285 // be 5286 resultSize = 0; 5287 resultMode = MeasureSpec.UNSPECIFIED; 5288 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5289 // Child wants to determine its own size.... find out how 5290 // big it should be 5291 resultSize = 0; 5292 resultMode = MeasureSpec.UNSPECIFIED; 5293 } 5294 break; 5295 } 5296 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5297 } 5298 5299 5300 /** 5301 * Removes any pending animations for views that have been removed. Call 5302 * this if you don't want animations for exiting views to stack up. 5303 */ 5304 public void clearDisappearingChildren() { 5305 if (mDisappearingChildren != null) { 5306 mDisappearingChildren.clear(); 5307 invalidate(); 5308 } 5309 } 5310 5311 /** 5312 * Add a view which is removed from mChildren but still needs animation 5313 * 5314 * @param v View to add 5315 */ 5316 private void addDisappearingView(View v) { 5317 ArrayList<View> disappearingChildren = mDisappearingChildren; 5318 5319 if (disappearingChildren == null) { 5320 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5321 } 5322 5323 disappearingChildren.add(v); 5324 } 5325 5326 /** 5327 * Cleanup a view when its animation is done. This may mean removing it from 5328 * the list of disappearing views. 5329 * 5330 * @param view The view whose animation has finished 5331 * @param animation The animation, cannot be null 5332 */ 5333 void finishAnimatingView(final View view, Animation animation) { 5334 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5335 if (disappearingChildren != null) { 5336 if (disappearingChildren.contains(view)) { 5337 disappearingChildren.remove(view); 5338 5339 if (view.mAttachInfo != null) { 5340 view.dispatchDetachedFromWindow(); 5341 } 5342 5343 view.clearAnimation(); 5344 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5345 } 5346 } 5347 5348 if (animation != null && !animation.getFillAfter()) { 5349 view.clearAnimation(); 5350 } 5351 5352 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5353 view.onAnimationEnd(); 5354 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5355 // so we'd rather be safe than sorry 5356 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5357 // Draw one more frame after the animation is done 5358 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5359 } 5360 } 5361 5362 /** 5363 * Utility function called by View during invalidation to determine whether a view that 5364 * is invisible or gone should still be invalidated because it is being transitioned (and 5365 * therefore still needs to be drawn). 5366 */ 5367 boolean isViewTransitioning(View view) { 5368 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5369 } 5370 5371 /** 5372 * This method tells the ViewGroup that the given View object, which should have this 5373 * ViewGroup as its parent, 5374 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5375 * is removed from its parent. This allows animations, such as those used by 5376 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5377 * the removal of views. A call to this method should always be accompanied by a later call 5378 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5379 * so that the View finally gets removed. 5380 * 5381 * @param view The View object to be kept visible even if it gets removed from its parent. 5382 */ 5383 public void startViewTransition(View view) { 5384 if (view.mParent == this) { 5385 if (mTransitioningViews == null) { 5386 mTransitioningViews = new ArrayList<View>(); 5387 } 5388 mTransitioningViews.add(view); 5389 } 5390 } 5391 5392 /** 5393 * This method should always be called following an earlier call to 5394 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5395 * and will no longer be displayed. Note that this method does not perform the functionality 5396 * of removing a view from its parent; it just discontinues the display of a View that 5397 * has previously been removed. 5398 * 5399 * @return view The View object that has been removed but is being kept around in the visible 5400 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5401 */ 5402 public void endViewTransition(View view) { 5403 if (mTransitioningViews != null) { 5404 mTransitioningViews.remove(view); 5405 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5406 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5407 disappearingChildren.remove(view); 5408 if (mVisibilityChangingChildren != null && 5409 mVisibilityChangingChildren.contains(view)) { 5410 mVisibilityChangingChildren.remove(view); 5411 } else { 5412 if (view.mAttachInfo != null) { 5413 view.dispatchDetachedFromWindow(); 5414 } 5415 if (view.mParent != null) { 5416 view.mParent = null; 5417 } 5418 } 5419 invalidate(); 5420 } 5421 } 5422 } 5423 5424 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5425 new LayoutTransition.TransitionListener() { 5426 @Override 5427 public void startTransition(LayoutTransition transition, ViewGroup container, 5428 View view, int transitionType) { 5429 // We only care about disappearing items, since we need special logic to keep 5430 // those items visible after they've been 'removed' 5431 if (transitionType == LayoutTransition.DISAPPEARING) { 5432 startViewTransition(view); 5433 } 5434 } 5435 5436 @Override 5437 public void endTransition(LayoutTransition transition, ViewGroup container, 5438 View view, int transitionType) { 5439 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5440 requestLayout(); 5441 mLayoutCalledWhileSuppressed = false; 5442 } 5443 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5444 endViewTransition(view); 5445 } 5446 } 5447 }; 5448 5449 /** 5450 * Tells this ViewGroup to suppress all layout() calls until layout 5451 * suppression is disabled with a later call to suppressLayout(false). 5452 * When layout suppression is disabled, a requestLayout() call is sent 5453 * if layout() was attempted while layout was being suppressed. 5454 * 5455 * @hide 5456 */ 5457 public void suppressLayout(boolean suppress) { 5458 mSuppressLayout = suppress; 5459 if (!suppress) { 5460 if (mLayoutCalledWhileSuppressed) { 5461 requestLayout(); 5462 mLayoutCalledWhileSuppressed = false; 5463 } 5464 } 5465 } 5466 5467 /** 5468 * Returns whether layout calls on this container are currently being 5469 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 5470 * 5471 * @return true if layout calls are currently suppressed, false otherwise. 5472 * 5473 * @hide 5474 */ 5475 public boolean isLayoutSuppressed() { 5476 return mSuppressLayout; 5477 } 5478 5479 /** 5480 * {@inheritDoc} 5481 */ 5482 @Override 5483 public boolean gatherTransparentRegion(Region region) { 5484 // If no transparent regions requested, we are always opaque. 5485 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5486 if (meOpaque && region == null) { 5487 // The caller doesn't care about the region, so stop now. 5488 return true; 5489 } 5490 super.gatherTransparentRegion(region); 5491 final View[] children = mChildren; 5492 final int count = mChildrenCount; 5493 boolean noneOfTheChildrenAreTransparent = true; 5494 for (int i = 0; i < count; i++) { 5495 final View child = children[i]; 5496 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5497 if (!child.gatherTransparentRegion(region)) { 5498 noneOfTheChildrenAreTransparent = false; 5499 } 5500 } 5501 } 5502 return meOpaque || noneOfTheChildrenAreTransparent; 5503 } 5504 5505 /** 5506 * {@inheritDoc} 5507 */ 5508 public void requestTransparentRegion(View child) { 5509 if (child != null) { 5510 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5511 if (mParent != null) { 5512 mParent.requestTransparentRegion(this); 5513 } 5514 } 5515 } 5516 5517 5518 @Override 5519 protected boolean fitSystemWindows(Rect insets) { 5520 boolean done = super.fitSystemWindows(insets); 5521 if (!done) { 5522 final int count = mChildrenCount; 5523 final View[] children = mChildren; 5524 for (int i = 0; i < count; i++) { 5525 done = children[i].fitSystemWindows(insets); 5526 if (done) { 5527 break; 5528 } 5529 } 5530 } 5531 return done; 5532 } 5533 5534 /** 5535 * Returns the animation listener to which layout animation events are 5536 * sent. 5537 * 5538 * @return an {@link android.view.animation.Animation.AnimationListener} 5539 */ 5540 public Animation.AnimationListener getLayoutAnimationListener() { 5541 return mAnimationListener; 5542 } 5543 5544 @Override 5545 protected void drawableStateChanged() { 5546 super.drawableStateChanged(); 5547 5548 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5549 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5550 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5551 + " child has duplicateParentState set to true"); 5552 } 5553 5554 final View[] children = mChildren; 5555 final int count = mChildrenCount; 5556 5557 for (int i = 0; i < count; i++) { 5558 final View child = children[i]; 5559 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5560 child.refreshDrawableState(); 5561 } 5562 } 5563 } 5564 } 5565 5566 @Override 5567 public void jumpDrawablesToCurrentState() { 5568 super.jumpDrawablesToCurrentState(); 5569 final View[] children = mChildren; 5570 final int count = mChildrenCount; 5571 for (int i = 0; i < count; i++) { 5572 children[i].jumpDrawablesToCurrentState(); 5573 } 5574 } 5575 5576 @Override 5577 protected int[] onCreateDrawableState(int extraSpace) { 5578 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5579 return super.onCreateDrawableState(extraSpace); 5580 } 5581 5582 int need = 0; 5583 int n = getChildCount(); 5584 for (int i = 0; i < n; i++) { 5585 int[] childState = getChildAt(i).getDrawableState(); 5586 5587 if (childState != null) { 5588 need += childState.length; 5589 } 5590 } 5591 5592 int[] state = super.onCreateDrawableState(extraSpace + need); 5593 5594 for (int i = 0; i < n; i++) { 5595 int[] childState = getChildAt(i).getDrawableState(); 5596 5597 if (childState != null) { 5598 state = mergeDrawableStates(state, childState); 5599 } 5600 } 5601 5602 return state; 5603 } 5604 5605 /** 5606 * Sets whether this ViewGroup's drawable states also include 5607 * its children's drawable states. This is used, for example, to 5608 * make a group appear to be focused when its child EditText or button 5609 * is focused. 5610 */ 5611 public void setAddStatesFromChildren(boolean addsStates) { 5612 if (addsStates) { 5613 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5614 } else { 5615 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5616 } 5617 5618 refreshDrawableState(); 5619 } 5620 5621 /** 5622 * Returns whether this ViewGroup's drawable states also include 5623 * its children's drawable states. This is used, for example, to 5624 * make a group appear to be focused when its child EditText or button 5625 * is focused. 5626 */ 5627 public boolean addStatesFromChildren() { 5628 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5629 } 5630 5631 /** 5632 * If {@link #addStatesFromChildren} is true, refreshes this group's 5633 * drawable state (to include the states from its children). 5634 */ 5635 public void childDrawableStateChanged(View child) { 5636 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5637 refreshDrawableState(); 5638 } 5639 } 5640 5641 /** 5642 * Specifies the animation listener to which layout animation events must 5643 * be sent. Only 5644 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5645 * and 5646 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5647 * are invoked. 5648 * 5649 * @param animationListener the layout animation listener 5650 */ 5651 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5652 mAnimationListener = animationListener; 5653 } 5654 5655 /** 5656 * This method is called by LayoutTransition when there are 'changing' animations that need 5657 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5658 * starts all pending transitions prior to the drawing phase in the current traversal. 5659 * 5660 * @param transition The LayoutTransition to be started on the next traversal. 5661 * 5662 * @hide 5663 */ 5664 public void requestTransitionStart(LayoutTransition transition) { 5665 ViewRootImpl viewAncestor = getViewRootImpl(); 5666 if (viewAncestor != null) { 5667 viewAncestor.requestTransitionStart(transition); 5668 } 5669 } 5670 5671 /** 5672 * @hide 5673 */ 5674 @Override 5675 public boolean resolveRtlPropertiesIfNeeded() { 5676 final boolean result = super.resolveRtlPropertiesIfNeeded(); 5677 // We dont need to resolve the children RTL properties if nothing has changed for the parent 5678 if (result) { 5679 int count = getChildCount(); 5680 for (int i = 0; i < count; i++) { 5681 final View child = getChildAt(i); 5682 if (child.isLayoutDirectionInherited()) { 5683 child.resolveRtlPropertiesIfNeeded(); 5684 } 5685 } 5686 } 5687 return result; 5688 } 5689 5690 /** 5691 * @hide 5692 */ 5693 @Override 5694 public boolean resolveLayoutDirection() { 5695 final boolean result = super.resolveLayoutDirection(); 5696 if (result) { 5697 int count = getChildCount(); 5698 for (int i = 0; i < count; i++) { 5699 final View child = getChildAt(i); 5700 if (child.isLayoutDirectionInherited()) { 5701 child.resolveLayoutDirection(); 5702 } 5703 } 5704 } 5705 return result; 5706 } 5707 5708 /** 5709 * @hide 5710 */ 5711 @Override 5712 public boolean resolveTextDirection() { 5713 final boolean result = super.resolveTextDirection(); 5714 if (result) { 5715 int count = getChildCount(); 5716 for (int i = 0; i < count; i++) { 5717 final View child = getChildAt(i); 5718 if (child.isTextDirectionInherited()) { 5719 child.resolveTextDirection(); 5720 } 5721 } 5722 } 5723 return result; 5724 } 5725 5726 /** 5727 * @hide 5728 */ 5729 @Override 5730 public boolean resolveTextAlignment() { 5731 final boolean result = super.resolveTextAlignment(); 5732 if (result) { 5733 int count = getChildCount(); 5734 for (int i = 0; i < count; i++) { 5735 final View child = getChildAt(i); 5736 if (child.isTextAlignmentInherited()) { 5737 child.resolveTextAlignment(); 5738 } 5739 } 5740 } 5741 return result; 5742 } 5743 5744 /** 5745 * @hide 5746 */ 5747 @Override 5748 public void resolvePadding() { 5749 super.resolvePadding(); 5750 int count = getChildCount(); 5751 for (int i = 0; i < count; i++) { 5752 final View child = getChildAt(i); 5753 if (child.isLayoutDirectionInherited()) { 5754 child.resolvePadding(); 5755 } 5756 } 5757 } 5758 5759 /** 5760 * @hide 5761 */ 5762 @Override 5763 protected void resolveDrawables() { 5764 super.resolveDrawables(); 5765 int count = getChildCount(); 5766 for (int i = 0; i < count; i++) { 5767 final View child = getChildAt(i); 5768 if (child.isLayoutDirectionInherited()) { 5769 child.resolveDrawables(); 5770 } 5771 } 5772 } 5773 5774 /** 5775 * @hide 5776 */ 5777 @Override 5778 public void resolveLayoutParams() { 5779 super.resolveLayoutParams(); 5780 int count = getChildCount(); 5781 for (int i = 0; i < count; i++) { 5782 final View child = getChildAt(i); 5783 child.resolveLayoutParams(); 5784 } 5785 } 5786 5787 /** 5788 * @hide 5789 */ 5790 @Override 5791 public void resetResolvedLayoutDirection() { 5792 super.resetResolvedLayoutDirection(); 5793 5794 int count = getChildCount(); 5795 for (int i = 0; i < count; i++) { 5796 final View child = getChildAt(i); 5797 if (child.isLayoutDirectionInherited()) { 5798 child.resetResolvedLayoutDirection(); 5799 } 5800 } 5801 } 5802 5803 /** 5804 * @hide 5805 */ 5806 @Override 5807 public void resetResolvedTextDirection() { 5808 super.resetResolvedTextDirection(); 5809 5810 int count = getChildCount(); 5811 for (int i = 0; i < count; i++) { 5812 final View child = getChildAt(i); 5813 if (child.isTextDirectionInherited()) { 5814 child.resetResolvedTextDirection(); 5815 } 5816 } 5817 } 5818 5819 /** 5820 * @hide 5821 */ 5822 @Override 5823 public void resetResolvedTextAlignment() { 5824 super.resetResolvedTextAlignment(); 5825 5826 int count = getChildCount(); 5827 for (int i = 0; i < count; i++) { 5828 final View child = getChildAt(i); 5829 if (child.isTextAlignmentInherited()) { 5830 child.resetResolvedTextAlignment(); 5831 } 5832 } 5833 } 5834 5835 /** 5836 * @hide 5837 */ 5838 @Override 5839 public void resetResolvedPadding() { 5840 super.resetResolvedPadding(); 5841 5842 int count = getChildCount(); 5843 for (int i = 0; i < count; i++) { 5844 final View child = getChildAt(i); 5845 if (child.isLayoutDirectionInherited()) { 5846 child.resetResolvedPadding(); 5847 } 5848 } 5849 } 5850 5851 /** 5852 * @hide 5853 */ 5854 @Override 5855 protected void resetResolvedDrawables() { 5856 super.resetResolvedDrawables(); 5857 5858 int count = getChildCount(); 5859 for (int i = 0; i < count; i++) { 5860 final View child = getChildAt(i); 5861 if (child.isLayoutDirectionInherited()) { 5862 child.resetResolvedDrawables(); 5863 } 5864 } 5865 } 5866 5867 /** 5868 * Return true if the pressed state should be delayed for children or descendants of this 5869 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5870 * This prevents the pressed state from appearing when the user is actually trying to scroll 5871 * the content. 5872 * 5873 * The default implementation returns true for compatibility reasons. Subclasses that do 5874 * not scroll should generally override this method and return false. 5875 */ 5876 public boolean shouldDelayChildPressedState() { 5877 return true; 5878 } 5879 5880 /** @hide */ 5881 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5882 } 5883 5884 /** 5885 * LayoutParams are used by views to tell their parents how they want to be 5886 * laid out. See 5887 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5888 * for a list of all child view attributes that this class supports. 5889 * 5890 * <p> 5891 * The base LayoutParams class just describes how big the view wants to be 5892 * for both width and height. For each dimension, it can specify one of: 5893 * <ul> 5894 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5895 * means that the view wants to be as big as its parent (minus padding) 5896 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5897 * to enclose its content (plus padding) 5898 * <li> an exact number 5899 * </ul> 5900 * There are subclasses of LayoutParams for different subclasses of 5901 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5902 * LayoutParams which adds an X and Y value.</p> 5903 * 5904 * <div class="special reference"> 5905 * <h3>Developer Guides</h3> 5906 * <p>For more information about creating user interface layouts, read the 5907 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5908 * guide.</p></div> 5909 * 5910 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5911 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5912 */ 5913 public static class LayoutParams { 5914 /** 5915 * Special value for the height or width requested by a View. 5916 * FILL_PARENT means that the view wants to be as big as its parent, 5917 * minus the parent's padding, if any. This value is deprecated 5918 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5919 */ 5920 @SuppressWarnings({"UnusedDeclaration"}) 5921 @Deprecated 5922 public static final int FILL_PARENT = -1; 5923 5924 /** 5925 * Special value for the height or width requested by a View. 5926 * MATCH_PARENT means that the view wants to be as big as its parent, 5927 * minus the parent's padding, if any. Introduced in API Level 8. 5928 */ 5929 public static final int MATCH_PARENT = -1; 5930 5931 /** 5932 * Special value for the height or width requested by a View. 5933 * WRAP_CONTENT means that the view wants to be just large enough to fit 5934 * its own internal content, taking its own padding into account. 5935 */ 5936 public static final int WRAP_CONTENT = -2; 5937 5938 /** 5939 * Information about how wide the view wants to be. Can be one of the 5940 * constants FILL_PARENT (replaced by MATCH_PARENT , 5941 * in API Level 8) or WRAP_CONTENT. or an exact size. 5942 */ 5943 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5944 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5945 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5946 }) 5947 public int width; 5948 5949 /** 5950 * Information about how tall the view wants to be. Can be one of the 5951 * constants FILL_PARENT (replaced by MATCH_PARENT , 5952 * in API Level 8) or WRAP_CONTENT. or an exact size. 5953 */ 5954 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5955 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5956 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5957 }) 5958 public int height; 5959 5960 /** 5961 * Used to animate layouts. 5962 */ 5963 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5964 5965 /** 5966 * Creates a new set of layout parameters. The values are extracted from 5967 * the supplied attributes set and context. The XML attributes mapped 5968 * to this set of layout parameters are: 5969 * 5970 * <ul> 5971 * <li><code>layout_width</code>: the width, either an exact value, 5972 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5973 * {@link #MATCH_PARENT} in API Level 8)</li> 5974 * <li><code>layout_height</code>: the height, either an exact value, 5975 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5976 * {@link #MATCH_PARENT} in API Level 8)</li> 5977 * </ul> 5978 * 5979 * @param c the application environment 5980 * @param attrs the set of attributes from which to extract the layout 5981 * parameters' values 5982 */ 5983 public LayoutParams(Context c, AttributeSet attrs) { 5984 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5985 setBaseAttributes(a, 5986 R.styleable.ViewGroup_Layout_layout_width, 5987 R.styleable.ViewGroup_Layout_layout_height); 5988 a.recycle(); 5989 } 5990 5991 /** 5992 * Creates a new set of layout parameters with the specified width 5993 * and height. 5994 * 5995 * @param width the width, either {@link #WRAP_CONTENT}, 5996 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5997 * API Level 8), or a fixed size in pixels 5998 * @param height the height, either {@link #WRAP_CONTENT}, 5999 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6000 * API Level 8), or a fixed size in pixels 6001 */ 6002 public LayoutParams(int width, int height) { 6003 this.width = width; 6004 this.height = height; 6005 } 6006 6007 /** 6008 * Copy constructor. Clones the width and height values of the source. 6009 * 6010 * @param source The layout params to copy from. 6011 */ 6012 public LayoutParams(LayoutParams source) { 6013 this.width = source.width; 6014 this.height = source.height; 6015 } 6016 6017 /** 6018 * Used internally by MarginLayoutParams. 6019 * @hide 6020 */ 6021 LayoutParams() { 6022 } 6023 6024 /** 6025 * Extracts the layout parameters from the supplied attributes. 6026 * 6027 * @param a the style attributes to extract the parameters from 6028 * @param widthAttr the identifier of the width attribute 6029 * @param heightAttr the identifier of the height attribute 6030 */ 6031 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6032 width = a.getLayoutDimension(widthAttr, "layout_width"); 6033 height = a.getLayoutDimension(heightAttr, "layout_height"); 6034 } 6035 6036 /** 6037 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6038 * layoutDirection changes should override this method. The default implementation does 6039 * nothing. 6040 * 6041 * @param layoutDirection the direction of the layout 6042 * 6043 * {@link View#LAYOUT_DIRECTION_LTR} 6044 * {@link View#LAYOUT_DIRECTION_RTL} 6045 */ 6046 public void resolveLayoutDirection(int layoutDirection) { 6047 } 6048 6049 /** 6050 * Returns a String representation of this set of layout parameters. 6051 * 6052 * @param output the String to prepend to the internal representation 6053 * @return a String with the following format: output + 6054 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6055 * 6056 * @hide 6057 */ 6058 public String debug(String output) { 6059 return output + "ViewGroup.LayoutParams={ width=" 6060 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6061 } 6062 6063 /** 6064 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6065 * 6066 * @param view the view that contains these layout parameters 6067 * @param canvas the canvas on which to draw 6068 * 6069 * @hide 6070 */ 6071 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6072 } 6073 6074 /** 6075 * Converts the specified size to a readable String. 6076 * 6077 * @param size the size to convert 6078 * @return a String instance representing the supplied size 6079 * 6080 * @hide 6081 */ 6082 protected static String sizeToString(int size) { 6083 if (size == WRAP_CONTENT) { 6084 return "wrap-content"; 6085 } 6086 if (size == MATCH_PARENT) { 6087 return "match-parent"; 6088 } 6089 return String.valueOf(size); 6090 } 6091 } 6092 6093 /** 6094 * Per-child layout information for layouts that support margins. 6095 * See 6096 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6097 * for a list of all child view attributes that this class supports. 6098 */ 6099 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6100 /** 6101 * The left margin in pixels of the child. 6102 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6103 * to this field. 6104 */ 6105 @ViewDebug.ExportedProperty(category = "layout") 6106 public int leftMargin; 6107 6108 /** 6109 * The top margin in pixels of the child. 6110 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6111 * to this field. 6112 */ 6113 @ViewDebug.ExportedProperty(category = "layout") 6114 public int topMargin; 6115 6116 /** 6117 * The right margin in pixels of the child. 6118 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6119 * to this field. 6120 */ 6121 @ViewDebug.ExportedProperty(category = "layout") 6122 public int rightMargin; 6123 6124 /** 6125 * The bottom margin in pixels of the child. 6126 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6127 * to this field. 6128 */ 6129 @ViewDebug.ExportedProperty(category = "layout") 6130 public int bottomMargin; 6131 6132 /** 6133 * The start margin in pixels of the child. 6134 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6135 * to this field. 6136 */ 6137 @ViewDebug.ExportedProperty(category = "layout") 6138 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6139 6140 /** 6141 * The end margin in pixels of the child. 6142 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6143 * to this field. 6144 */ 6145 @ViewDebug.ExportedProperty(category = "layout") 6146 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6147 6148 /** 6149 * The default start and end margin. 6150 * @hide 6151 */ 6152 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6153 6154 /** 6155 * Bit 0: layout direction 6156 * Bit 1: layout direction 6157 * Bit 2: left margin undefined 6158 * Bit 3: right margin undefined 6159 * Bit 4: is RTL compatibility mode 6160 * Bit 5: need resolution 6161 * 6162 * Bit 6 to 7 not used 6163 * 6164 * @hide 6165 */ 6166 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6167 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6168 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6169 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6170 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6171 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6172 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6173 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6174 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6175 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6176 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6177 }) 6178 byte mMarginFlags; 6179 6180 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6181 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6182 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6183 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6184 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6185 6186 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6187 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6188 6189 /** 6190 * Creates a new set of layout parameters. The values are extracted from 6191 * the supplied attributes set and context. 6192 * 6193 * @param c the application environment 6194 * @param attrs the set of attributes from which to extract the layout 6195 * parameters' values 6196 */ 6197 public MarginLayoutParams(Context c, AttributeSet attrs) { 6198 super(); 6199 6200 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6201 setBaseAttributes(a, 6202 R.styleable.ViewGroup_MarginLayout_layout_width, 6203 R.styleable.ViewGroup_MarginLayout_layout_height); 6204 6205 int margin = a.getDimensionPixelSize( 6206 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6207 if (margin >= 0) { 6208 leftMargin = margin; 6209 topMargin = margin; 6210 rightMargin= margin; 6211 bottomMargin = margin; 6212 } else { 6213 leftMargin = a.getDimensionPixelSize( 6214 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6215 UNDEFINED_MARGIN); 6216 if (leftMargin == UNDEFINED_MARGIN) { 6217 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6218 leftMargin = DEFAULT_MARGIN_RESOLVED; 6219 } 6220 rightMargin = a.getDimensionPixelSize( 6221 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6222 UNDEFINED_MARGIN); 6223 if (rightMargin == UNDEFINED_MARGIN) { 6224 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6225 rightMargin = DEFAULT_MARGIN_RESOLVED; 6226 } 6227 6228 topMargin = a.getDimensionPixelSize( 6229 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6230 DEFAULT_MARGIN_RESOLVED); 6231 bottomMargin = a.getDimensionPixelSize( 6232 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6233 DEFAULT_MARGIN_RESOLVED); 6234 6235 startMargin = a.getDimensionPixelSize( 6236 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6237 DEFAULT_MARGIN_RELATIVE); 6238 endMargin = a.getDimensionPixelSize( 6239 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6240 DEFAULT_MARGIN_RELATIVE); 6241 6242 if (isMarginRelative()) { 6243 mMarginFlags |= NEED_RESOLUTION_MASK; 6244 } 6245 } 6246 6247 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6248 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6249 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6250 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6251 } 6252 6253 // Layout direction is LTR by default 6254 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6255 6256 a.recycle(); 6257 } 6258 6259 /** 6260 * {@inheritDoc} 6261 */ 6262 public MarginLayoutParams(int width, int height) { 6263 super(width, height); 6264 6265 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6266 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6267 6268 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6269 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6270 } 6271 6272 /** 6273 * Copy constructor. Clones the width, height and margin values of the source. 6274 * 6275 * @param source The layout params to copy from. 6276 */ 6277 public MarginLayoutParams(MarginLayoutParams source) { 6278 this.width = source.width; 6279 this.height = source.height; 6280 6281 this.leftMargin = source.leftMargin; 6282 this.topMargin = source.topMargin; 6283 this.rightMargin = source.rightMargin; 6284 this.bottomMargin = source.bottomMargin; 6285 this.startMargin = source.startMargin; 6286 this.endMargin = source.endMargin; 6287 6288 this.mMarginFlags = source.mMarginFlags; 6289 } 6290 6291 /** 6292 * {@inheritDoc} 6293 */ 6294 public MarginLayoutParams(LayoutParams source) { 6295 super(source); 6296 6297 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6298 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6299 6300 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6301 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6302 } 6303 6304 /** 6305 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6306 * to be done so that the new margins are taken into account. Left and right margins may be 6307 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6308 * 6309 * @param left the left margin size 6310 * @param top the top margin size 6311 * @param right the right margin size 6312 * @param bottom the bottom margin size 6313 * 6314 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6315 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6316 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6317 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6318 */ 6319 public void setMargins(int left, int top, int right, int bottom) { 6320 leftMargin = left; 6321 topMargin = top; 6322 rightMargin = right; 6323 bottomMargin = bottom; 6324 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6325 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6326 if (isMarginRelative()) { 6327 mMarginFlags |= NEED_RESOLUTION_MASK; 6328 } else { 6329 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6330 } 6331 } 6332 6333 /** 6334 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6335 * needs to be done so that the new relative margins are taken into account. Left and right 6336 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6337 * direction. 6338 * 6339 * @param start the start margin size 6340 * @param top the top margin size 6341 * @param end the right margin size 6342 * @param bottom the bottom margin size 6343 * 6344 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6345 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6346 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6347 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6348 * 6349 * @hide 6350 */ 6351 public void setMarginsRelative(int start, int top, int end, int bottom) { 6352 startMargin = start; 6353 topMargin = top; 6354 endMargin = end; 6355 bottomMargin = bottom; 6356 mMarginFlags |= NEED_RESOLUTION_MASK; 6357 } 6358 6359 /** 6360 * Sets the relative start margin. 6361 * 6362 * @param start the start margin size 6363 * 6364 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6365 */ 6366 public void setMarginStart(int start) { 6367 startMargin = start; 6368 mMarginFlags |= NEED_RESOLUTION_MASK; 6369 } 6370 6371 /** 6372 * Returns the start margin in pixels. 6373 * 6374 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6375 * 6376 * @return the start margin in pixels. 6377 */ 6378 public int getMarginStart() { 6379 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6380 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6381 doResolveMargins(); 6382 } 6383 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6384 case View.LAYOUT_DIRECTION_RTL: 6385 return rightMargin; 6386 case View.LAYOUT_DIRECTION_LTR: 6387 default: 6388 return leftMargin; 6389 } 6390 } 6391 6392 /** 6393 * Sets the relative end margin. 6394 * 6395 * @param end the end margin size 6396 * 6397 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6398 */ 6399 public void setMarginEnd(int end) { 6400 endMargin = end; 6401 mMarginFlags |= NEED_RESOLUTION_MASK; 6402 } 6403 6404 /** 6405 * Returns the end margin in pixels. 6406 * 6407 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6408 * 6409 * @return the end margin in pixels. 6410 */ 6411 public int getMarginEnd() { 6412 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6413 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6414 doResolveMargins(); 6415 } 6416 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6417 case View.LAYOUT_DIRECTION_RTL: 6418 return leftMargin; 6419 case View.LAYOUT_DIRECTION_LTR: 6420 default: 6421 return rightMargin; 6422 } 6423 } 6424 6425 /** 6426 * Check if margins are relative. 6427 * 6428 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6429 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6430 * 6431 * @return true if either marginStart or marginEnd has been set. 6432 */ 6433 public boolean isMarginRelative() { 6434 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6435 } 6436 6437 /** 6438 * Set the layout direction 6439 * @param layoutDirection the layout direction. 6440 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6441 * or {@link View#LAYOUT_DIRECTION_RTL}. 6442 */ 6443 public void setLayoutDirection(int layoutDirection) { 6444 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6445 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6446 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6447 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6448 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6449 if (isMarginRelative()) { 6450 mMarginFlags |= NEED_RESOLUTION_MASK; 6451 } else { 6452 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6453 } 6454 } 6455 } 6456 6457 /** 6458 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6459 * {@link View#LAYOUT_DIRECTION_RTL}. 6460 * 6461 * @return the layout direction. 6462 */ 6463 public int getLayoutDirection() { 6464 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6465 } 6466 6467 /** 6468 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6469 * may be overridden depending on layout direction. 6470 */ 6471 @Override 6472 public void resolveLayoutDirection(int layoutDirection) { 6473 setLayoutDirection(layoutDirection); 6474 6475 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6476 // Will use the left and right margins if no relative margin is defined. 6477 if (!isMarginRelative() || 6478 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 6479 6480 // Proceed with resolution 6481 doResolveMargins(); 6482 } 6483 6484 private void doResolveMargins() { 6485 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 6486 // if left or right margins are not defined and if we have some start or end margin 6487 // defined then use those start and end margins. 6488 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 6489 && startMargin > DEFAULT_MARGIN_RELATIVE) { 6490 leftMargin = startMargin; 6491 } 6492 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 6493 && endMargin > DEFAULT_MARGIN_RELATIVE) { 6494 rightMargin = endMargin; 6495 } 6496 } else { 6497 // We have some relative margins (either the start one or the end one or both). So use 6498 // them and override what has been defined for left and right margins. If either start 6499 // or end margin is not defined, just set it to default "0". 6500 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6501 case View.LAYOUT_DIRECTION_RTL: 6502 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6503 endMargin : DEFAULT_MARGIN_RESOLVED; 6504 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6505 startMargin : DEFAULT_MARGIN_RESOLVED; 6506 break; 6507 case View.LAYOUT_DIRECTION_LTR: 6508 default: 6509 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 6510 startMargin : DEFAULT_MARGIN_RESOLVED; 6511 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 6512 endMargin : DEFAULT_MARGIN_RESOLVED; 6513 break; 6514 } 6515 } 6516 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6517 } 6518 6519 /** 6520 * @hide 6521 */ 6522 public boolean isLayoutRtl() { 6523 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 6524 } 6525 6526 /** 6527 * @hide 6528 */ 6529 @Override 6530 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6531 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6532 6533 fillDifference(canvas, 6534 view.getLeft() + oi.left, 6535 view.getTop() + oi.top, 6536 view.getRight() - oi.right, 6537 view.getBottom() - oi.bottom, 6538 leftMargin, 6539 topMargin, 6540 rightMargin, 6541 bottomMargin, 6542 paint); 6543 } 6544 } 6545 6546 /* Describes a touched view and the ids of the pointers that it has captured. 6547 * 6548 * This code assumes that pointer ids are always in the range 0..31 such that 6549 * it can use a bitfield to track which pointer ids are present. 6550 * As it happens, the lower layers of the input dispatch pipeline also use the 6551 * same trick so the assumption should be safe here... 6552 */ 6553 private static final class TouchTarget { 6554 private static final int MAX_RECYCLED = 32; 6555 private static final Object sRecycleLock = new Object[0]; 6556 private static TouchTarget sRecycleBin; 6557 private static int sRecycledCount; 6558 6559 public static final int ALL_POINTER_IDS = -1; // all ones 6560 6561 // The touched child view. 6562 public View child; 6563 6564 // The combined bit mask of pointer ids for all pointers captured by the target. 6565 public int pointerIdBits; 6566 6567 // The next target in the target list. 6568 public TouchTarget next; 6569 6570 private TouchTarget() { 6571 } 6572 6573 public static TouchTarget obtain(View child, int pointerIdBits) { 6574 final TouchTarget target; 6575 synchronized (sRecycleLock) { 6576 if (sRecycleBin == null) { 6577 target = new TouchTarget(); 6578 } else { 6579 target = sRecycleBin; 6580 sRecycleBin = target.next; 6581 sRecycledCount--; 6582 target.next = null; 6583 } 6584 } 6585 target.child = child; 6586 target.pointerIdBits = pointerIdBits; 6587 return target; 6588 } 6589 6590 public void recycle() { 6591 synchronized (sRecycleLock) { 6592 if (sRecycledCount < MAX_RECYCLED) { 6593 next = sRecycleBin; 6594 sRecycleBin = this; 6595 sRecycledCount += 1; 6596 } else { 6597 next = null; 6598 } 6599 child = null; 6600 } 6601 } 6602 } 6603 6604 /* Describes a hovered view. */ 6605 private static final class HoverTarget { 6606 private static final int MAX_RECYCLED = 32; 6607 private static final Object sRecycleLock = new Object[0]; 6608 private static HoverTarget sRecycleBin; 6609 private static int sRecycledCount; 6610 6611 // The hovered child view. 6612 public View child; 6613 6614 // The next target in the target list. 6615 public HoverTarget next; 6616 6617 private HoverTarget() { 6618 } 6619 6620 public static HoverTarget obtain(View child) { 6621 final HoverTarget target; 6622 synchronized (sRecycleLock) { 6623 if (sRecycleBin == null) { 6624 target = new HoverTarget(); 6625 } else { 6626 target = sRecycleBin; 6627 sRecycleBin = target.next; 6628 sRecycledCount--; 6629 target.next = null; 6630 } 6631 } 6632 target.child = child; 6633 return target; 6634 } 6635 6636 public void recycle() { 6637 synchronized (sRecycleLock) { 6638 if (sRecycledCount < MAX_RECYCLED) { 6639 next = sRecycleBin; 6640 sRecycleBin = this; 6641 sRecycledCount += 1; 6642 } else { 6643 next = null; 6644 } 6645 child = null; 6646 } 6647 } 6648 } 6649 6650 /** 6651 * Pooled class that orderes the children of a ViewGroup from start 6652 * to end based on how they are laid out and the layout direction. 6653 */ 6654 static class ChildListForAccessibility { 6655 6656 private static final int MAX_POOL_SIZE = 32; 6657 6658 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6659 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6660 6661 private final ArrayList<View> mChildren = new ArrayList<View>(); 6662 6663 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6664 6665 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6666 ChildListForAccessibility list = sPool.acquire(); 6667 if (list == null) { 6668 list = new ChildListForAccessibility(); 6669 } 6670 list.init(parent, sort); 6671 return list; 6672 } 6673 6674 public void recycle() { 6675 clear(); 6676 sPool.release(this); 6677 } 6678 6679 public int getChildCount() { 6680 return mChildren.size(); 6681 } 6682 6683 public View getChildAt(int index) { 6684 return mChildren.get(index); 6685 } 6686 6687 public int getChildIndex(View child) { 6688 return mChildren.indexOf(child); 6689 } 6690 6691 private void init(ViewGroup parent, boolean sort) { 6692 ArrayList<View> children = mChildren; 6693 final int childCount = parent.getChildCount(); 6694 for (int i = 0; i < childCount; i++) { 6695 View child = parent.getChildAt(i); 6696 children.add(child); 6697 } 6698 if (sort) { 6699 ArrayList<ViewLocationHolder> holders = mHolders; 6700 for (int i = 0; i < childCount; i++) { 6701 View child = children.get(i); 6702 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6703 holders.add(holder); 6704 } 6705 Collections.sort(holders); 6706 for (int i = 0; i < childCount; i++) { 6707 ViewLocationHolder holder = holders.get(i); 6708 children.set(i, holder.mView); 6709 holder.recycle(); 6710 } 6711 holders.clear(); 6712 } 6713 } 6714 6715 private void clear() { 6716 mChildren.clear(); 6717 } 6718 } 6719 6720 /** 6721 * Pooled class that holds a View and its location with respect to 6722 * a specified root. This enables sorting of views based on their 6723 * coordinates without recomputing the position relative to the root 6724 * on every comparison. 6725 */ 6726 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6727 6728 private static final int MAX_POOL_SIZE = 32; 6729 6730 private static final SynchronizedPool<ViewLocationHolder> sPool = 6731 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6732 6733 private final Rect mLocation = new Rect(); 6734 6735 public View mView; 6736 6737 private int mLayoutDirection; 6738 6739 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6740 ViewLocationHolder holder = sPool.acquire(); 6741 if (holder == null) { 6742 holder = new ViewLocationHolder(); 6743 } 6744 holder.init(root, view); 6745 return holder; 6746 } 6747 6748 public void recycle() { 6749 clear(); 6750 sPool.release(this); 6751 } 6752 6753 @Override 6754 public int compareTo(ViewLocationHolder another) { 6755 // This instance is greater than an invalid argument. 6756 if (another == null) { 6757 return 1; 6758 } 6759 if (getClass() != another.getClass()) { 6760 return 1; 6761 } 6762 // First is above second. 6763 if (mLocation.bottom - another.mLocation.top <= 0) { 6764 return -1; 6765 } 6766 // First is below second. 6767 if (mLocation.top - another.mLocation.bottom >= 0) { 6768 return 1; 6769 } 6770 // LTR 6771 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6772 final int leftDifference = mLocation.left - another.mLocation.left; 6773 // First more to the left than second. 6774 if (leftDifference != 0) { 6775 return leftDifference; 6776 } 6777 } else { // RTL 6778 final int rightDifference = mLocation.right - another.mLocation.right; 6779 // First more to the right than second. 6780 if (rightDifference != 0) { 6781 return -rightDifference; 6782 } 6783 } 6784 // Break tie by top. 6785 final int topDiference = mLocation.top - another.mLocation.top; 6786 if (topDiference != 0) { 6787 return topDiference; 6788 } 6789 // Break tie by height. 6790 final int heightDiference = mLocation.height() - another.mLocation.height(); 6791 if (heightDiference != 0) { 6792 return -heightDiference; 6793 } 6794 // Break tie by width. 6795 final int widthDiference = mLocation.width() - another.mLocation.width(); 6796 if (widthDiference != 0) { 6797 return -widthDiference; 6798 } 6799 // Just break the tie somehow. The accessibliity ids are unique 6800 // and stable, hence this is deterministic tie breaking. 6801 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6802 } 6803 6804 private void init(ViewGroup root, View view) { 6805 Rect viewLocation = mLocation; 6806 view.getDrawingRect(viewLocation); 6807 root.offsetDescendantRectToMyCoords(view, viewLocation); 6808 mView = view; 6809 mLayoutDirection = root.getLayoutDirection(); 6810 } 6811 6812 private void clear() { 6813 mView = null; 6814 mLocation.set(0, 0, 0, 0); 6815 } 6816 } 6817 6818 private static Paint getDebugPaint() { 6819 if (sDebugPaint == null) { 6820 sDebugPaint = new Paint(); 6821 sDebugPaint.setAntiAlias(false); 6822 } 6823 return sDebugPaint; 6824 } 6825 6826 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6827 if (sDebugLines== null) { 6828 // TODO: This won't work with multiple UI threads in a single process 6829 sDebugLines = new float[16]; 6830 } 6831 6832 sDebugLines[0] = x1; 6833 sDebugLines[1] = y1; 6834 sDebugLines[2] = x2; 6835 sDebugLines[3] = y1; 6836 6837 sDebugLines[4] = x2; 6838 sDebugLines[5] = y1; 6839 sDebugLines[6] = x2; 6840 sDebugLines[7] = y2; 6841 6842 sDebugLines[8] = x2; 6843 sDebugLines[9] = y2; 6844 sDebugLines[10] = x1; 6845 sDebugLines[11] = y2; 6846 6847 sDebugLines[12] = x1; 6848 sDebugLines[13] = y2; 6849 sDebugLines[14] = x1; 6850 sDebugLines[15] = y1; 6851 6852 canvas.drawLines(sDebugLines, paint); 6853 } 6854} 6855