ViewGroup.java revision 36350a9592425c2bb4984eb2374356d2459238c4
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 54/** 55 * <p> 56 * A <code>ViewGroup</code> is a special view that can contain other views 57 * (called children.) The view group is the base class for layouts and views 58 * containers. This class also defines the 59 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 60 * class for layouts parameters. 61 * </p> 62 * 63 * <p> 64 * Also see {@link LayoutParams} for layout attributes. 65 * </p> 66 * 67 * <div class="special reference"> 68 * <h3>Developer Guides</h3> 69 * <p>For more information about creating user interface layouts, read the 70 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 71 * guide.</p></div> 72 * 73 * <p>Here is a complete implementation of a custom ViewGroup that implements 74 * a simple {@link android.widget.FrameLayout} along with the ability to stack 75 * children in left and right gutters.</p> 76 * 77 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 78 * Complete} 79 * 80 * <p>If you are implementing XML layout attributes as shown in the example, this is the 81 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 82 * 83 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 84 * 85 * <p>Finally the layout manager can be used in an XML layout like so:</p> 86 * 87 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 88 * 89 * @attr ref android.R.styleable#ViewGroup_clipChildren 90 * @attr ref android.R.styleable#ViewGroup_clipToPadding 91 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 92 * @attr ref android.R.styleable#ViewGroup_animationCache 93 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 94 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 95 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 96 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 97 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 98 */ 99public abstract class ViewGroup extends View implements ViewParent, ViewManager { 100 private static final String TAG = "ViewGroup"; 101 102 private static final boolean DBG = false; 103 /** @hide */ 104 public static boolean DEBUG_DRAW = false; 105 106 /** 107 * Views which have been hidden or removed which need to be animated on 108 * their way out. 109 * This field should be made private, so it is hidden from the SDK. 110 * {@hide} 111 */ 112 protected ArrayList<View> mDisappearingChildren; 113 114 /** 115 * Listener used to propagate events indicating when children are added 116 * and/or removed from a view group. 117 * This field should be made private, so it is hidden from the SDK. 118 * {@hide} 119 */ 120 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 121 122 // The view contained within this ViewGroup that has or contains focus. 123 private View mFocused; 124 125 /** 126 * A Transformation used when drawing children, to 127 * apply on the child being drawn. 128 */ 129 final Transformation mChildTransformation = new Transformation(); 130 131 /** 132 * Used to track the current invalidation region. 133 */ 134 RectF mInvalidateRegion; 135 136 /** 137 * A Transformation used to calculate a correct 138 * invalidation area when the application is autoscaled. 139 */ 140 Transformation mInvalidationTransformation; 141 142 // View currently under an ongoing drag 143 private View mCurrentDragView; 144 145 // Metadata about the ongoing drag 146 private DragEvent mCurrentDrag; 147 private HashSet<View> mDragNotifiedChildren; 148 149 // Does this group have a child that can accept the current drag payload? 150 private boolean mChildAcceptsDrag; 151 152 // Used during drag dispatch 153 private final PointF mLocalPoint = new PointF(); 154 155 // Layout animation 156 private LayoutAnimationController mLayoutAnimationController; 157 private Animation.AnimationListener mAnimationListener; 158 159 // First touch target in the linked list of touch targets. 160 private TouchTarget mFirstTouchTarget; 161 162 // For debugging only. You can see these in hierarchyviewer. 163 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 164 @ViewDebug.ExportedProperty(category = "events") 165 private long mLastTouchDownTime; 166 @ViewDebug.ExportedProperty(category = "events") 167 private int mLastTouchDownIndex = -1; 168 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 169 @ViewDebug.ExportedProperty(category = "events") 170 private float mLastTouchDownX; 171 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 172 @ViewDebug.ExportedProperty(category = "events") 173 private float mLastTouchDownY; 174 175 // First hover target in the linked list of hover targets. 176 // The hover targets are children which have received ACTION_HOVER_ENTER. 177 // They might not have actually handled the hover event, but we will 178 // continue sending hover events to them as long as the pointer remains over 179 // their bounds and the view group does not intercept hover. 180 private HoverTarget mFirstHoverTarget; 181 182 // True if the view group itself received a hover event. 183 // It might not have actually handled the hover event. 184 private boolean mHoveredSelf; 185 186 /** 187 * Internal flags. 188 * 189 * This field should be made private, so it is hidden from the SDK. 190 * {@hide} 191 */ 192 @ViewDebug.ExportedProperty(flagMapping = { 193 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 194 name = "CLIP_CHILDREN"), 195 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 196 name = "CLIP_TO_PADDING"), 197 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 198 name = "PADDING_NOT_NULL") 199 }) 200 protected int mGroupFlags; 201 202 /** 203 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 204 */ 205 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 206 207 /** 208 * NOTE: If you change the flags below make sure to reflect the changes 209 * the DisplayList class 210 */ 211 212 // When set, ViewGroup invalidates only the child's rectangle 213 // Set by default 214 static final int FLAG_CLIP_CHILDREN = 0x1; 215 216 // When set, ViewGroup excludes the padding area from the invalidate rectangle 217 // Set by default 218 private static final int FLAG_CLIP_TO_PADDING = 0x2; 219 220 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 221 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 222 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 223 224 // When set, dispatchDraw() will run the layout animation and unset the flag 225 private static final int FLAG_RUN_ANIMATION = 0x8; 226 227 // When set, there is either no layout animation on the ViewGroup or the layout 228 // animation is over 229 // Set by default 230 static final int FLAG_ANIMATION_DONE = 0x10; 231 232 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 233 // to clip it, even if FLAG_CLIP_TO_PADDING is set 234 private static final int FLAG_PADDING_NOT_NULL = 0x20; 235 236 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 237 // Set by default 238 private static final int FLAG_ANIMATION_CACHE = 0x40; 239 240 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 241 // layout animation; this avoid clobbering the hierarchy 242 // Automatically set when the layout animation starts, depending on the animation's 243 // characteristics 244 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 245 246 // When set, the next call to drawChild() will clear mChildTransformation's matrix 247 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 248 249 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 250 // the children's Bitmap caches if necessary 251 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 252 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 253 254 /** 255 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 256 * to get the index of the child to draw for that iteration. 257 * 258 * @hide 259 */ 260 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 261 262 /** 263 * When set, this ViewGroup supports static transformations on children; this causes 264 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 265 * invoked when a child is drawn. 266 * 267 * Any subclass overriding 268 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 269 * set this flags in {@link #mGroupFlags}. 270 * 271 * {@hide} 272 */ 273 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 274 275 // When the previous drawChild() invocation used an alpha value that was lower than 276 // 1.0 and set it in mCachePaint 277 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 278 279 /** 280 * When set, this ViewGroup's drawable states also include those 281 * of its children. 282 */ 283 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 284 285 /** 286 * When set, this ViewGroup tries to always draw its children using their drawing cache. 287 */ 288 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 289 290 /** 291 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 292 * draw its children with their drawing cache. 293 */ 294 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 295 296 /** 297 * When set, this group will go through its list of children to notify them of 298 * any drawable state change. 299 */ 300 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 301 302 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 303 304 /** 305 * This view will get focus before any of its descendants. 306 */ 307 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 308 309 /** 310 * This view will get focus only if none of its descendants want it. 311 */ 312 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 313 314 /** 315 * This view will block any of its descendants from getting focus, even 316 * if they are focusable. 317 */ 318 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 319 320 /** 321 * Used to map between enum in attrubutes and flag values. 322 */ 323 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 324 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 325 FOCUS_BLOCK_DESCENDANTS}; 326 327 /** 328 * When set, this ViewGroup should not intercept touch events. 329 * {@hide} 330 */ 331 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 332 333 /** 334 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 335 */ 336 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 337 338 /** 339 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 340 * to children when adding new views. This is used to prevent multiple 341 * onAttached calls when a ViewGroup adds children in its own onAttached method. 342 */ 343 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 344 345 /** 346 * When true, indicates that a layoutMode has been explicitly set, either with 347 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 348 * This distinguishes the situation in which a layout mode was inherited from 349 * one of the ViewGroup's ancestors and cached locally. 350 */ 351 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 352 353 /** 354 * Indicates which types of drawing caches are to be kept in memory. 355 * This field should be made private, so it is hidden from the SDK. 356 * {@hide} 357 */ 358 protected int mPersistentDrawingCache; 359 360 /** 361 * Used to indicate that no drawing cache should be kept in memory. 362 */ 363 public static final int PERSISTENT_NO_CACHE = 0x0; 364 365 /** 366 * Used to indicate that the animation drawing cache should be kept in memory. 367 */ 368 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 369 370 /** 371 * Used to indicate that the scrolling drawing cache should be kept in memory. 372 */ 373 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 374 375 /** 376 * Used to indicate that all drawing caches should be kept in memory. 377 */ 378 public static final int PERSISTENT_ALL_CACHES = 0x3; 379 380 // Layout Modes 381 382 private static final int LAYOUT_MODE_UNDEFINED = -1; 383 384 /** 385 * This constant is a {@link #setLayoutMode(int) layoutMode}. 386 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 387 * {@link #getRight() right} and {@link #getBottom() bottom}. 388 */ 389 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 390 391 /** 392 * This constant is a {@link #setLayoutMode(int) layoutMode}. 393 * Optical bounds describe where a widget appears to be. They sit inside the clip 394 * bounds which need to cover a larger area to allow other effects, 395 * such as shadows and glows, to be drawn. 396 */ 397 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 398 399 /** @hide */ 400 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 401 402 /** 403 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 404 * are set at the same time. 405 */ 406 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 407 408 // Index of the child's left position in the mLocation array 409 private static final int CHILD_LEFT_INDEX = 0; 410 // Index of the child's top position in the mLocation array 411 private static final int CHILD_TOP_INDEX = 1; 412 413 // Child views of this ViewGroup 414 private View[] mChildren; 415 // Number of valid children in the mChildren array, the rest should be null or not 416 // considered as children 417 418 private boolean mLayoutSuppressed = false; 419 420 private int mChildrenCount; 421 422 private static final int ARRAY_INITIAL_CAPACITY = 12; 423 private static final int ARRAY_CAPACITY_INCREMENT = 12; 424 425 private static Paint sDebugPaint; 426 private static float[] sDebugLines; 427 428 // Used to draw cached views 429 Paint mCachePaint; 430 431 // Used to animate add/remove changes in layout 432 private LayoutTransition mTransition; 433 434 // The set of views that are currently being transitioned. This list is used to track views 435 // being removed that should not actually be removed from the parent yet because they are 436 // being animated. 437 private ArrayList<View> mTransitioningViews; 438 439 // List of children changing visibility. This is used to potentially keep rendering 440 // views during a transition when they otherwise would have become gone/invisible 441 private ArrayList<View> mVisibilityChangingChildren; 442 443 // Indicates how many of this container's child subtrees contain transient state 444 @ViewDebug.ExportedProperty(category = "layout") 445 private int mChildCountWithTransientState = 0; 446 447 public ViewGroup(Context context) { 448 super(context); 449 initViewGroup(); 450 } 451 452 public ViewGroup(Context context, AttributeSet attrs) { 453 super(context, attrs); 454 initViewGroup(); 455 initFromAttributes(context, attrs); 456 } 457 458 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 459 super(context, attrs, defStyle); 460 initViewGroup(); 461 initFromAttributes(context, attrs); 462 } 463 464 private boolean debugDraw() { 465 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 466 } 467 468 private void initViewGroup() { 469 // ViewGroup doesn't draw by default 470 if (!debugDraw()) { 471 setFlags(WILL_NOT_DRAW, DRAW_MASK); 472 } 473 mGroupFlags |= FLAG_CLIP_CHILDREN; 474 mGroupFlags |= FLAG_CLIP_TO_PADDING; 475 mGroupFlags |= FLAG_ANIMATION_DONE; 476 mGroupFlags |= FLAG_ANIMATION_CACHE; 477 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 478 479 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 480 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 481 } 482 483 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 484 485 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 486 mChildrenCount = 0; 487 488 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 489 } 490 491 private void initFromAttributes(Context context, AttributeSet attrs) { 492 TypedArray a = context.obtainStyledAttributes(attrs, 493 R.styleable.ViewGroup); 494 495 final int N = a.getIndexCount(); 496 for (int i = 0; i < N; i++) { 497 int attr = a.getIndex(i); 498 switch (attr) { 499 case R.styleable.ViewGroup_clipChildren: 500 setClipChildren(a.getBoolean(attr, true)); 501 break; 502 case R.styleable.ViewGroup_clipToPadding: 503 setClipToPadding(a.getBoolean(attr, true)); 504 break; 505 case R.styleable.ViewGroup_animationCache: 506 setAnimationCacheEnabled(a.getBoolean(attr, true)); 507 break; 508 case R.styleable.ViewGroup_persistentDrawingCache: 509 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 510 break; 511 case R.styleable.ViewGroup_addStatesFromChildren: 512 setAddStatesFromChildren(a.getBoolean(attr, false)); 513 break; 514 case R.styleable.ViewGroup_alwaysDrawnWithCache: 515 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 516 break; 517 case R.styleable.ViewGroup_layoutAnimation: 518 int id = a.getResourceId(attr, -1); 519 if (id > 0) { 520 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 521 } 522 break; 523 case R.styleable.ViewGroup_descendantFocusability: 524 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 525 break; 526 case R.styleable.ViewGroup_splitMotionEvents: 527 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 528 break; 529 case R.styleable.ViewGroup_animateLayoutChanges: 530 boolean animateLayoutChanges = a.getBoolean(attr, false); 531 if (animateLayoutChanges) { 532 setLayoutTransition(new LayoutTransition()); 533 } 534 break; 535 case R.styleable.ViewGroup_layoutMode: 536 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 537 break; 538 } 539 } 540 541 a.recycle(); 542 } 543 544 /** 545 * Gets the descendant focusability of this view group. The descendant 546 * focusability defines the relationship between this view group and its 547 * descendants when looking for a view to take focus in 548 * {@link #requestFocus(int, android.graphics.Rect)}. 549 * 550 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 551 * {@link #FOCUS_BLOCK_DESCENDANTS}. 552 */ 553 @ViewDebug.ExportedProperty(category = "focus", mapping = { 554 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 555 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 556 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 557 }) 558 public int getDescendantFocusability() { 559 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 560 } 561 562 /** 563 * Set the descendant focusability of this view group. This defines the relationship 564 * between this view group and its descendants when looking for a view to 565 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 566 * 567 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 568 * {@link #FOCUS_BLOCK_DESCENDANTS}. 569 */ 570 public void setDescendantFocusability(int focusability) { 571 switch (focusability) { 572 case FOCUS_BEFORE_DESCENDANTS: 573 case FOCUS_AFTER_DESCENDANTS: 574 case FOCUS_BLOCK_DESCENDANTS: 575 break; 576 default: 577 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 578 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 579 } 580 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 581 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 582 } 583 584 /** 585 * {@inheritDoc} 586 */ 587 @Override 588 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 589 if (mFocused != null) { 590 mFocused.unFocus(); 591 mFocused = null; 592 } 593 super.handleFocusGainInternal(direction, previouslyFocusedRect); 594 } 595 596 /** 597 * {@inheritDoc} 598 */ 599 public void requestChildFocus(View child, View focused) { 600 if (DBG) { 601 System.out.println(this + " requestChildFocus()"); 602 } 603 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 604 return; 605 } 606 607 // Unfocus us, if necessary 608 super.unFocus(); 609 610 // We had a previous notion of who had focus. Clear it. 611 if (mFocused != child) { 612 if (mFocused != null) { 613 mFocused.unFocus(); 614 } 615 616 mFocused = child; 617 } 618 if (mParent != null) { 619 mParent.requestChildFocus(this, focused); 620 } 621 } 622 623 /** 624 * {@inheritDoc} 625 */ 626 public void focusableViewAvailable(View v) { 627 if (mParent != null 628 // shortcut: don't report a new focusable view if we block our descendants from 629 // getting focus 630 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 631 // shortcut: don't report a new focusable view if we already are focused 632 // (and we don't prefer our descendants) 633 // 634 // note: knowing that mFocused is non-null is not a good enough reason 635 // to break the traversal since in that case we'd actually have to find 636 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 637 // an ancestor of v; this will get checked for at ViewAncestor 638 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 639 mParent.focusableViewAvailable(v); 640 } 641 } 642 643 /** 644 * {@inheritDoc} 645 */ 646 public boolean showContextMenuForChild(View originalView) { 647 return mParent != null && mParent.showContextMenuForChild(originalView); 648 } 649 650 /** 651 * {@inheritDoc} 652 */ 653 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 654 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 655 } 656 657 /** 658 * Find the nearest view in the specified direction that wants to take 659 * focus. 660 * 661 * @param focused The view that currently has focus 662 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 663 * FOCUS_RIGHT, or 0 for not applicable. 664 */ 665 public View focusSearch(View focused, int direction) { 666 if (isRootNamespace()) { 667 // root namespace means we should consider ourselves the top of the 668 // tree for focus searching; otherwise we could be focus searching 669 // into other tabs. see LocalActivityManager and TabHost for more info 670 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 671 } else if (mParent != null) { 672 return mParent.focusSearch(focused, direction); 673 } 674 return null; 675 } 676 677 /** 678 * {@inheritDoc} 679 */ 680 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 681 return false; 682 } 683 684 /** 685 * {@inheritDoc} 686 */ 687 @Override 688 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 689 ViewParent parent = mParent; 690 if (parent == null) { 691 return false; 692 } 693 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 694 if (!propagate) { 695 return false; 696 } 697 return parent.requestSendAccessibilityEvent(this, event); 698 } 699 700 /** 701 * Called when a child has requested sending an {@link AccessibilityEvent} and 702 * gives an opportunity to its parent to augment the event. 703 * <p> 704 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 705 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 706 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 707 * is responsible for handling this call. 708 * </p> 709 * 710 * @param child The child which requests sending the event. 711 * @param event The event to be sent. 712 * @return True if the event should be sent. 713 * 714 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 715 */ 716 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 717 if (mAccessibilityDelegate != null) { 718 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 719 } else { 720 return onRequestSendAccessibilityEventInternal(child, event); 721 } 722 } 723 724 /** 725 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 726 * 727 * Note: Called from the default {@link View.AccessibilityDelegate}. 728 */ 729 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 730 return true; 731 } 732 733 /** 734 * Called when a child view has changed whether or not it is tracking transient state. 735 * 736 * @hide 737 */ 738 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 739 final boolean oldHasTransientState = hasTransientState(); 740 if (childHasTransientState) { 741 mChildCountWithTransientState++; 742 } else { 743 mChildCountWithTransientState--; 744 } 745 746 final boolean newHasTransientState = hasTransientState(); 747 if (mParent != null && oldHasTransientState != newHasTransientState) { 748 try { 749 mParent.childHasTransientStateChanged(this, newHasTransientState); 750 } catch (AbstractMethodError e) { 751 Log.e(TAG, mParent.getClass().getSimpleName() + 752 " does not fully implement ViewParent", e); 753 } 754 } 755 } 756 757 /** 758 * @hide 759 */ 760 @Override 761 public boolean hasTransientState() { 762 return mChildCountWithTransientState > 0 || super.hasTransientState(); 763 } 764 765 /** 766 * {@inheritDoc} 767 */ 768 @Override 769 public boolean dispatchUnhandledMove(View focused, int direction) { 770 return mFocused != null && 771 mFocused.dispatchUnhandledMove(focused, direction); 772 } 773 774 /** 775 * {@inheritDoc} 776 */ 777 public void clearChildFocus(View child) { 778 if (DBG) { 779 System.out.println(this + " clearChildFocus()"); 780 } 781 782 mFocused = null; 783 if (mParent != null) { 784 mParent.clearChildFocus(this); 785 } 786 } 787 788 /** 789 * {@inheritDoc} 790 */ 791 @Override 792 public void clearFocus() { 793 if (DBG) { 794 System.out.println(this + " clearFocus()"); 795 } 796 if (mFocused == null) { 797 super.clearFocus(); 798 } else { 799 View focused = mFocused; 800 mFocused = null; 801 focused.clearFocus(); 802 } 803 } 804 805 /** 806 * {@inheritDoc} 807 */ 808 @Override 809 void unFocus() { 810 if (DBG) { 811 System.out.println(this + " unFocus()"); 812 } 813 if (mFocused == null) { 814 super.unFocus(); 815 } else { 816 mFocused.unFocus(); 817 mFocused = null; 818 } 819 } 820 821 /** 822 * Returns the focused child of this view, if any. The child may have focus 823 * or contain focus. 824 * 825 * @return the focused child or null. 826 */ 827 public View getFocusedChild() { 828 return mFocused; 829 } 830 831 /** 832 * Returns true if this view has or contains focus 833 * 834 * @return true if this view has or contains focus 835 */ 836 @Override 837 public boolean hasFocus() { 838 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 839 } 840 841 /* 842 * (non-Javadoc) 843 * 844 * @see android.view.View#findFocus() 845 */ 846 @Override 847 public View findFocus() { 848 if (DBG) { 849 System.out.println("Find focus in " + this + ": flags=" 850 + isFocused() + ", child=" + mFocused); 851 } 852 853 if (isFocused()) { 854 return this; 855 } 856 857 if (mFocused != null) { 858 return mFocused.findFocus(); 859 } 860 return null; 861 } 862 863 /** 864 * {@inheritDoc} 865 */ 866 @Override 867 public boolean hasFocusable() { 868 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 869 return false; 870 } 871 872 if (isFocusable()) { 873 return true; 874 } 875 876 final int descendantFocusability = getDescendantFocusability(); 877 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 878 final int count = mChildrenCount; 879 final View[] children = mChildren; 880 881 for (int i = 0; i < count; i++) { 882 final View child = children[i]; 883 if (child.hasFocusable()) { 884 return true; 885 } 886 } 887 } 888 889 return false; 890 } 891 892 /** 893 * {@inheritDoc} 894 */ 895 @Override 896 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 897 final int focusableCount = views.size(); 898 899 final int descendantFocusability = getDescendantFocusability(); 900 901 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 902 final int count = mChildrenCount; 903 final View[] children = mChildren; 904 905 for (int i = 0; i < count; i++) { 906 final View child = children[i]; 907 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 908 child.addFocusables(views, direction, focusableMode); 909 } 910 } 911 } 912 913 // we add ourselves (if focusable) in all cases except for when we are 914 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 915 // to avoid the focus search finding layouts when a more precise search 916 // among the focusable children would be more interesting. 917 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 918 // No focusable descendants 919 || (focusableCount == views.size())) { 920 super.addFocusables(views, direction, focusableMode); 921 } 922 } 923 924 @Override 925 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 926 super.findViewsWithText(outViews, text, flags); 927 final int childrenCount = mChildrenCount; 928 final View[] children = mChildren; 929 for (int i = 0; i < childrenCount; i++) { 930 View child = children[i]; 931 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 932 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 933 child.findViewsWithText(outViews, text, flags); 934 } 935 } 936 } 937 938 @Override 939 View findViewByAccessibilityIdTraversal(int accessibilityId) { 940 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 941 if (foundView != null) { 942 return foundView; 943 } 944 final int childrenCount = mChildrenCount; 945 final View[] children = mChildren; 946 for (int i = 0; i < childrenCount; i++) { 947 View child = children[i]; 948 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 949 if (foundView != null) { 950 return foundView; 951 } 952 } 953 return null; 954 } 955 956 /** 957 * {@inheritDoc} 958 */ 959 @Override 960 public void dispatchWindowFocusChanged(boolean hasFocus) { 961 super.dispatchWindowFocusChanged(hasFocus); 962 final int count = mChildrenCount; 963 final View[] children = mChildren; 964 for (int i = 0; i < count; i++) { 965 children[i].dispatchWindowFocusChanged(hasFocus); 966 } 967 } 968 969 /** 970 * {@inheritDoc} 971 */ 972 @Override 973 public void addTouchables(ArrayList<View> views) { 974 super.addTouchables(views); 975 976 final int count = mChildrenCount; 977 final View[] children = mChildren; 978 979 for (int i = 0; i < count; i++) { 980 final View child = children[i]; 981 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 982 child.addTouchables(views); 983 } 984 } 985 } 986 987 /** 988 * @hide 989 */ 990 @Override 991 public void makeOptionalFitsSystemWindows() { 992 super.makeOptionalFitsSystemWindows(); 993 final int count = mChildrenCount; 994 final View[] children = mChildren; 995 for (int i = 0; i < count; i++) { 996 children[i].makeOptionalFitsSystemWindows(); 997 } 998 } 999 1000 /** 1001 * {@inheritDoc} 1002 */ 1003 @Override 1004 public void dispatchDisplayHint(int hint) { 1005 super.dispatchDisplayHint(hint); 1006 final int count = mChildrenCount; 1007 final View[] children = mChildren; 1008 for (int i = 0; i < count; i++) { 1009 children[i].dispatchDisplayHint(hint); 1010 } 1011 } 1012 1013 /** 1014 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1015 * action. 1016 * 1017 * @param child The view whose visibility has changed 1018 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1019 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1020 * @hide 1021 */ 1022 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1023 if (mTransition != null) { 1024 if (newVisibility == VISIBLE) { 1025 mTransition.showChild(this, child, oldVisibility); 1026 } else { 1027 mTransition.hideChild(this, child, newVisibility); 1028 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1029 // Only track this on disappearing views - appearing views are already visible 1030 // and don't need special handling during drawChild() 1031 if (mVisibilityChangingChildren == null) { 1032 mVisibilityChangingChildren = new ArrayList<View>(); 1033 } 1034 mVisibilityChangingChildren.add(child); 1035 addDisappearingView(child); 1036 } 1037 } 1038 } 1039 1040 // in all cases, for drags 1041 if (mCurrentDrag != null) { 1042 if (newVisibility == VISIBLE) { 1043 notifyChildOfDrag(child); 1044 } 1045 } 1046 } 1047 1048 /** 1049 * {@inheritDoc} 1050 */ 1051 @Override 1052 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1053 super.dispatchVisibilityChanged(changedView, visibility); 1054 final int count = mChildrenCount; 1055 final View[] children = mChildren; 1056 for (int i = 0; i < count; i++) { 1057 children[i].dispatchVisibilityChanged(changedView, visibility); 1058 } 1059 } 1060 1061 /** 1062 * {@inheritDoc} 1063 */ 1064 @Override 1065 public void dispatchWindowVisibilityChanged(int visibility) { 1066 super.dispatchWindowVisibilityChanged(visibility); 1067 final int count = mChildrenCount; 1068 final View[] children = mChildren; 1069 for (int i = 0; i < count; i++) { 1070 children[i].dispatchWindowVisibilityChanged(visibility); 1071 } 1072 } 1073 1074 /** 1075 * {@inheritDoc} 1076 */ 1077 @Override 1078 public void dispatchConfigurationChanged(Configuration newConfig) { 1079 super.dispatchConfigurationChanged(newConfig); 1080 final int count = mChildrenCount; 1081 final View[] children = mChildren; 1082 for (int i = 0; i < count; i++) { 1083 children[i].dispatchConfigurationChanged(newConfig); 1084 } 1085 } 1086 1087 /** 1088 * {@inheritDoc} 1089 */ 1090 public void recomputeViewAttributes(View child) { 1091 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1092 ViewParent parent = mParent; 1093 if (parent != null) parent.recomputeViewAttributes(this); 1094 } 1095 } 1096 1097 @Override 1098 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1099 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1100 super.dispatchCollectViewAttributes(attachInfo, visibility); 1101 final int count = mChildrenCount; 1102 final View[] children = mChildren; 1103 for (int i = 0; i < count; i++) { 1104 final View child = children[i]; 1105 child.dispatchCollectViewAttributes(attachInfo, 1106 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1107 } 1108 } 1109 } 1110 1111 /** 1112 * {@inheritDoc} 1113 */ 1114 public void bringChildToFront(View child) { 1115 int index = indexOfChild(child); 1116 if (index >= 0) { 1117 removeFromArray(index); 1118 addInArray(child, mChildrenCount); 1119 child.mParent = this; 1120 } 1121 } 1122 1123 /** 1124 * {@inheritDoc} 1125 */ 1126 // TODO: Write real docs 1127 @Override 1128 public boolean dispatchDragEvent(DragEvent event) { 1129 boolean retval = false; 1130 final float tx = event.mX; 1131 final float ty = event.mY; 1132 1133 ViewRootImpl root = getViewRootImpl(); 1134 1135 // Dispatch down the view hierarchy 1136 switch (event.mAction) { 1137 case DragEvent.ACTION_DRAG_STARTED: { 1138 // clear state to recalculate which views we drag over 1139 mCurrentDragView = null; 1140 1141 // Set up our tracking of drag-started notifications 1142 mCurrentDrag = DragEvent.obtain(event); 1143 if (mDragNotifiedChildren == null) { 1144 mDragNotifiedChildren = new HashSet<View>(); 1145 } else { 1146 mDragNotifiedChildren.clear(); 1147 } 1148 1149 // Now dispatch down to our children, caching the responses 1150 mChildAcceptsDrag = false; 1151 final int count = mChildrenCount; 1152 final View[] children = mChildren; 1153 for (int i = 0; i < count; i++) { 1154 final View child = children[i]; 1155 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1156 if (child.getVisibility() == VISIBLE) { 1157 final boolean handled = notifyChildOfDrag(children[i]); 1158 if (handled) { 1159 mChildAcceptsDrag = true; 1160 } 1161 } 1162 } 1163 1164 // Return HANDLED if one of our children can accept the drag 1165 if (mChildAcceptsDrag) { 1166 retval = true; 1167 } 1168 } break; 1169 1170 case DragEvent.ACTION_DRAG_ENDED: { 1171 // Release the bookkeeping now that the drag lifecycle has ended 1172 if (mDragNotifiedChildren != null) { 1173 for (View child : mDragNotifiedChildren) { 1174 // If a child was notified about an ongoing drag, it's told that it's over 1175 child.dispatchDragEvent(event); 1176 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1177 child.refreshDrawableState(); 1178 } 1179 1180 mDragNotifiedChildren.clear(); 1181 if (mCurrentDrag != null) { 1182 mCurrentDrag.recycle(); 1183 mCurrentDrag = null; 1184 } 1185 } 1186 1187 // We consider drag-ended to have been handled if one of our children 1188 // had offered to handle the drag. 1189 if (mChildAcceptsDrag) { 1190 retval = true; 1191 } 1192 } break; 1193 1194 case DragEvent.ACTION_DRAG_LOCATION: { 1195 // Find the [possibly new] drag target 1196 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1197 1198 // If we've changed apparent drag target, tell the view root which view 1199 // we're over now [for purposes of the eventual drag-recipient-changed 1200 // notifications to the framework] and tell the new target that the drag 1201 // has entered its bounds. The root will see setDragFocus() calls all 1202 // the way down to the final leaf view that is handling the LOCATION event 1203 // before reporting the new potential recipient to the framework. 1204 if (mCurrentDragView != target) { 1205 root.setDragFocus(target); 1206 1207 final int action = event.mAction; 1208 // If we've dragged off of a child view, send it the EXITED message 1209 if (mCurrentDragView != null) { 1210 final View view = mCurrentDragView; 1211 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1212 view.dispatchDragEvent(event); 1213 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1214 view.refreshDrawableState(); 1215 } 1216 mCurrentDragView = target; 1217 1218 // If we've dragged over a new child view, send it the ENTERED message 1219 if (target != null) { 1220 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1221 target.dispatchDragEvent(event); 1222 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1223 target.refreshDrawableState(); 1224 } 1225 event.mAction = action; // restore the event's original state 1226 } 1227 1228 // Dispatch the actual drag location notice, localized into its coordinates 1229 if (target != null) { 1230 event.mX = mLocalPoint.x; 1231 event.mY = mLocalPoint.y; 1232 1233 retval = target.dispatchDragEvent(event); 1234 1235 event.mX = tx; 1236 event.mY = ty; 1237 } 1238 } break; 1239 1240 /* Entered / exited dispatch 1241 * 1242 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1243 * that we're about to get the corresponding LOCATION event, which we will use to 1244 * determine which of our children is the new target; at that point we will 1245 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1246 * 1247 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1248 * drag has left this ViewGroup, we know by definition that every contained subview 1249 * is also no longer under the drag point. 1250 */ 1251 1252 case DragEvent.ACTION_DRAG_EXITED: { 1253 if (mCurrentDragView != null) { 1254 final View view = mCurrentDragView; 1255 view.dispatchDragEvent(event); 1256 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1257 view.refreshDrawableState(); 1258 1259 mCurrentDragView = null; 1260 } 1261 } break; 1262 1263 case DragEvent.ACTION_DROP: { 1264 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1265 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1266 if (target != null) { 1267 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1268 event.mX = mLocalPoint.x; 1269 event.mY = mLocalPoint.y; 1270 retval = target.dispatchDragEvent(event); 1271 event.mX = tx; 1272 event.mY = ty; 1273 } else { 1274 if (ViewDebug.DEBUG_DRAG) { 1275 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1276 } 1277 } 1278 } break; 1279 } 1280 1281 // If none of our children could handle the event, try here 1282 if (!retval) { 1283 // Call up to the View implementation that dispatches to installed listeners 1284 retval = super.dispatchDragEvent(event); 1285 } 1286 return retval; 1287 } 1288 1289 // Find the frontmost child view that lies under the given point, and calculate 1290 // the position within its own local coordinate system. 1291 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1292 final int count = mChildrenCount; 1293 final View[] children = mChildren; 1294 for (int i = count - 1; i >= 0; i--) { 1295 final View child = children[i]; 1296 if (!child.canAcceptDrag()) { 1297 continue; 1298 } 1299 1300 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1301 return child; 1302 } 1303 } 1304 return null; 1305 } 1306 1307 boolean notifyChildOfDrag(View child) { 1308 if (ViewDebug.DEBUG_DRAG) { 1309 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1310 } 1311 1312 boolean canAccept = false; 1313 if (! mDragNotifiedChildren.contains(child)) { 1314 mDragNotifiedChildren.add(child); 1315 canAccept = child.dispatchDragEvent(mCurrentDrag); 1316 if (canAccept && !child.canAcceptDrag()) { 1317 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1318 child.refreshDrawableState(); 1319 } 1320 } 1321 return canAccept; 1322 } 1323 1324 @Override 1325 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1326 super.dispatchWindowSystemUiVisiblityChanged(visible); 1327 1328 final int count = mChildrenCount; 1329 final View[] children = mChildren; 1330 for (int i=0; i <count; i++) { 1331 final View child = children[i]; 1332 child.dispatchWindowSystemUiVisiblityChanged(visible); 1333 } 1334 } 1335 1336 @Override 1337 public void dispatchSystemUiVisibilityChanged(int visible) { 1338 super.dispatchSystemUiVisibilityChanged(visible); 1339 1340 final int count = mChildrenCount; 1341 final View[] children = mChildren; 1342 for (int i=0; i <count; i++) { 1343 final View child = children[i]; 1344 child.dispatchSystemUiVisibilityChanged(visible); 1345 } 1346 } 1347 1348 @Override 1349 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1350 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1351 1352 final int count = mChildrenCount; 1353 final View[] children = mChildren; 1354 for (int i=0; i <count; i++) { 1355 final View child = children[i]; 1356 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1357 } 1358 return changed; 1359 } 1360 1361 /** 1362 * {@inheritDoc} 1363 */ 1364 @Override 1365 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1366 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1367 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1368 return super.dispatchKeyEventPreIme(event); 1369 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1370 == PFLAG_HAS_BOUNDS) { 1371 return mFocused.dispatchKeyEventPreIme(event); 1372 } 1373 return false; 1374 } 1375 1376 /** 1377 * {@inheritDoc} 1378 */ 1379 @Override 1380 public boolean dispatchKeyEvent(KeyEvent event) { 1381 if (mInputEventConsistencyVerifier != null) { 1382 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1383 } 1384 1385 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1386 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1387 if (super.dispatchKeyEvent(event)) { 1388 return true; 1389 } 1390 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1391 == PFLAG_HAS_BOUNDS) { 1392 if (mFocused.dispatchKeyEvent(event)) { 1393 return true; 1394 } 1395 } 1396 1397 if (mInputEventConsistencyVerifier != null) { 1398 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1399 } 1400 return false; 1401 } 1402 1403 /** 1404 * {@inheritDoc} 1405 */ 1406 @Override 1407 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1408 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1409 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1410 return super.dispatchKeyShortcutEvent(event); 1411 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1412 == PFLAG_HAS_BOUNDS) { 1413 return mFocused.dispatchKeyShortcutEvent(event); 1414 } 1415 return false; 1416 } 1417 1418 /** 1419 * {@inheritDoc} 1420 */ 1421 @Override 1422 public boolean dispatchTrackballEvent(MotionEvent event) { 1423 if (mInputEventConsistencyVerifier != null) { 1424 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1425 } 1426 1427 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1428 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1429 if (super.dispatchTrackballEvent(event)) { 1430 return true; 1431 } 1432 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1433 == PFLAG_HAS_BOUNDS) { 1434 if (mFocused.dispatchTrackballEvent(event)) { 1435 return true; 1436 } 1437 } 1438 1439 if (mInputEventConsistencyVerifier != null) { 1440 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1441 } 1442 return false; 1443 } 1444 1445 /** 1446 * {@inheritDoc} 1447 */ 1448 @SuppressWarnings({"ConstantConditions"}) 1449 @Override 1450 protected boolean dispatchHoverEvent(MotionEvent event) { 1451 final int action = event.getAction(); 1452 1453 // First check whether the view group wants to intercept the hover event. 1454 final boolean interceptHover = onInterceptHoverEvent(event); 1455 event.setAction(action); // restore action in case it was changed 1456 1457 MotionEvent eventNoHistory = event; 1458 boolean handled = false; 1459 1460 // Send events to the hovered children and build a new list of hover targets until 1461 // one is found that handles the event. 1462 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1463 mFirstHoverTarget = null; 1464 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1465 final float x = event.getX(); 1466 final float y = event.getY(); 1467 final int childrenCount = mChildrenCount; 1468 if (childrenCount != 0) { 1469 final View[] children = mChildren; 1470 HoverTarget lastHoverTarget = null; 1471 for (int i = childrenCount - 1; i >= 0; i--) { 1472 final View child = children[i]; 1473 if (!canViewReceivePointerEvents(child) 1474 || !isTransformedTouchPointInView(x, y, child, null)) { 1475 continue; 1476 } 1477 1478 // Obtain a hover target for this child. Dequeue it from the 1479 // old hover target list if the child was previously hovered. 1480 HoverTarget hoverTarget = firstOldHoverTarget; 1481 final boolean wasHovered; 1482 for (HoverTarget predecessor = null; ;) { 1483 if (hoverTarget == null) { 1484 hoverTarget = HoverTarget.obtain(child); 1485 wasHovered = false; 1486 break; 1487 } 1488 1489 if (hoverTarget.child == child) { 1490 if (predecessor != null) { 1491 predecessor.next = hoverTarget.next; 1492 } else { 1493 firstOldHoverTarget = hoverTarget.next; 1494 } 1495 hoverTarget.next = null; 1496 wasHovered = true; 1497 break; 1498 } 1499 1500 predecessor = hoverTarget; 1501 hoverTarget = hoverTarget.next; 1502 } 1503 1504 // Enqueue the hover target onto the new hover target list. 1505 if (lastHoverTarget != null) { 1506 lastHoverTarget.next = hoverTarget; 1507 } else { 1508 lastHoverTarget = hoverTarget; 1509 mFirstHoverTarget = hoverTarget; 1510 } 1511 1512 // Dispatch the event to the child. 1513 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1514 if (!wasHovered) { 1515 // Send the enter as is. 1516 handled |= dispatchTransformedGenericPointerEvent( 1517 event, child); // enter 1518 } 1519 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1520 if (!wasHovered) { 1521 // Synthesize an enter from a move. 1522 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1523 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1524 handled |= dispatchTransformedGenericPointerEvent( 1525 eventNoHistory, child); // enter 1526 eventNoHistory.setAction(action); 1527 1528 handled |= dispatchTransformedGenericPointerEvent( 1529 eventNoHistory, child); // move 1530 } else { 1531 // Send the move as is. 1532 handled |= dispatchTransformedGenericPointerEvent(event, child); 1533 } 1534 } 1535 if (handled) { 1536 break; 1537 } 1538 } 1539 } 1540 } 1541 1542 // Send exit events to all previously hovered children that are no longer hovered. 1543 while (firstOldHoverTarget != null) { 1544 final View child = firstOldHoverTarget.child; 1545 1546 // Exit the old hovered child. 1547 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1548 // Send the exit as is. 1549 handled |= dispatchTransformedGenericPointerEvent( 1550 event, child); // exit 1551 } else { 1552 // Synthesize an exit from a move or enter. 1553 // Ignore the result because hover focus has moved to a different view. 1554 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1555 dispatchTransformedGenericPointerEvent( 1556 event, child); // move 1557 } 1558 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1559 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1560 dispatchTransformedGenericPointerEvent( 1561 eventNoHistory, child); // exit 1562 eventNoHistory.setAction(action); 1563 } 1564 1565 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1566 firstOldHoverTarget.recycle(); 1567 firstOldHoverTarget = nextOldHoverTarget; 1568 } 1569 1570 // Send events to the view group itself if no children have handled it. 1571 boolean newHoveredSelf = !handled; 1572 if (newHoveredSelf == mHoveredSelf) { 1573 if (newHoveredSelf) { 1574 // Send event to the view group as before. 1575 handled |= super.dispatchHoverEvent(event); 1576 } 1577 } else { 1578 if (mHoveredSelf) { 1579 // Exit the view group. 1580 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1581 // Send the exit as is. 1582 handled |= super.dispatchHoverEvent(event); // exit 1583 } else { 1584 // Synthesize an exit from a move or enter. 1585 // Ignore the result because hover focus is moving to a different view. 1586 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1587 super.dispatchHoverEvent(event); // move 1588 } 1589 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1590 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1591 super.dispatchHoverEvent(eventNoHistory); // exit 1592 eventNoHistory.setAction(action); 1593 } 1594 mHoveredSelf = false; 1595 } 1596 1597 if (newHoveredSelf) { 1598 // Enter the view group. 1599 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1600 // Send the enter as is. 1601 handled |= super.dispatchHoverEvent(event); // enter 1602 mHoveredSelf = true; 1603 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1604 // Synthesize an enter from a move. 1605 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1606 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1607 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1608 eventNoHistory.setAction(action); 1609 1610 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1611 mHoveredSelf = true; 1612 } 1613 } 1614 } 1615 1616 // Recycle the copy of the event that we made. 1617 if (eventNoHistory != event) { 1618 eventNoHistory.recycle(); 1619 } 1620 1621 // Done. 1622 return handled; 1623 } 1624 1625 private void exitHoverTargets() { 1626 if (mHoveredSelf || mFirstHoverTarget != null) { 1627 final long now = SystemClock.uptimeMillis(); 1628 MotionEvent event = MotionEvent.obtain(now, now, 1629 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1630 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1631 dispatchHoverEvent(event); 1632 event.recycle(); 1633 } 1634 } 1635 1636 private void cancelHoverTarget(View view) { 1637 HoverTarget predecessor = null; 1638 HoverTarget target = mFirstHoverTarget; 1639 while (target != null) { 1640 final HoverTarget next = target.next; 1641 if (target.child == view) { 1642 if (predecessor == null) { 1643 mFirstHoverTarget = next; 1644 } else { 1645 predecessor.next = next; 1646 } 1647 target.recycle(); 1648 1649 final long now = SystemClock.uptimeMillis(); 1650 MotionEvent event = MotionEvent.obtain(now, now, 1651 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1652 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1653 view.dispatchHoverEvent(event); 1654 event.recycle(); 1655 return; 1656 } 1657 predecessor = target; 1658 target = next; 1659 } 1660 } 1661 1662 /** @hide */ 1663 @Override 1664 protected boolean hasHoveredChild() { 1665 return mFirstHoverTarget != null; 1666 } 1667 1668 @Override 1669 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1670 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1671 try { 1672 final int childrenCount = children.getChildCount(); 1673 for (int i = 0; i < childrenCount; i++) { 1674 View child = children.getChildAt(i); 1675 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1676 if (child.includeForAccessibility()) { 1677 childrenForAccessibility.add(child); 1678 } else { 1679 child.addChildrenForAccessibility(childrenForAccessibility); 1680 } 1681 } 1682 } 1683 } finally { 1684 children.recycle(); 1685 } 1686 } 1687 1688 /** 1689 * @hide 1690 */ 1691 @Override 1692 public void childAccessibilityStateChanged(View child) { 1693 if (mParent != null) { 1694 mParent.childAccessibilityStateChanged(child); 1695 } 1696 } 1697 1698 /** 1699 * Implement this method to intercept hover events before they are handled 1700 * by child views. 1701 * <p> 1702 * This method is called before dispatching a hover event to a child of 1703 * the view group or to the view group's own {@link #onHoverEvent} to allow 1704 * the view group a chance to intercept the hover event. 1705 * This method can also be used to watch all pointer motions that occur within 1706 * the bounds of the view group even when the pointer is hovering over 1707 * a child of the view group rather than over the view group itself. 1708 * </p><p> 1709 * The view group can prevent its children from receiving hover events by 1710 * implementing this method and returning <code>true</code> to indicate 1711 * that it would like to intercept hover events. The view group must 1712 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1713 * for as long as it wishes to continue intercepting hover events from 1714 * its children. 1715 * </p><p> 1716 * Interception preserves the invariant that at most one view can be 1717 * hovered at a time by transferring hover focus from the currently hovered 1718 * child to the view group or vice-versa as needed. 1719 * </p><p> 1720 * If this method returns <code>true</code> and a child is already hovered, then the 1721 * child view will first receive a hover exit event and then the view group 1722 * itself will receive a hover enter event in {@link #onHoverEvent}. 1723 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1724 * events and instead returns <code>false</code> while the pointer is hovering 1725 * within the bounds of one of a child, then the view group will first receive a 1726 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1727 * receive a hover enter event. 1728 * </p><p> 1729 * The default implementation always returns false. 1730 * </p> 1731 * 1732 * @param event The motion event that describes the hover. 1733 * @return True if the view group would like to intercept the hover event 1734 * and prevent its children from receiving it. 1735 */ 1736 public boolean onInterceptHoverEvent(MotionEvent event) { 1737 return false; 1738 } 1739 1740 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1741 if (event.getHistorySize() == 0) { 1742 return event; 1743 } 1744 return MotionEvent.obtainNoHistory(event); 1745 } 1746 1747 /** 1748 * {@inheritDoc} 1749 */ 1750 @Override 1751 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1752 // Send the event to the child under the pointer. 1753 final int childrenCount = mChildrenCount; 1754 if (childrenCount != 0) { 1755 final View[] children = mChildren; 1756 final float x = event.getX(); 1757 final float y = event.getY(); 1758 1759 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1760 for (int i = childrenCount - 1; i >= 0; i--) { 1761 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1762 final View child = children[childIndex]; 1763 if (!canViewReceivePointerEvents(child) 1764 || !isTransformedTouchPointInView(x, y, child, null)) { 1765 continue; 1766 } 1767 1768 if (dispatchTransformedGenericPointerEvent(event, child)) { 1769 return true; 1770 } 1771 } 1772 } 1773 1774 // No child handled the event. Send it to this view group. 1775 return super.dispatchGenericPointerEvent(event); 1776 } 1777 1778 /** 1779 * {@inheritDoc} 1780 */ 1781 @Override 1782 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1783 // Send the event to the focused child or to this view group if it has focus. 1784 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1785 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1786 return super.dispatchGenericFocusedEvent(event); 1787 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1788 == PFLAG_HAS_BOUNDS) { 1789 return mFocused.dispatchGenericMotionEvent(event); 1790 } 1791 return false; 1792 } 1793 1794 /** 1795 * Dispatches a generic pointer event to a child, taking into account 1796 * transformations that apply to the child. 1797 * 1798 * @param event The event to send. 1799 * @param child The view to send the event to. 1800 * @return {@code true} if the child handled the event. 1801 */ 1802 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1803 final float offsetX = mScrollX - child.mLeft; 1804 final float offsetY = mScrollY - child.mTop; 1805 1806 boolean handled; 1807 if (!child.hasIdentityMatrix()) { 1808 MotionEvent transformedEvent = MotionEvent.obtain(event); 1809 transformedEvent.offsetLocation(offsetX, offsetY); 1810 transformedEvent.transform(child.getInverseMatrix()); 1811 handled = child.dispatchGenericMotionEvent(transformedEvent); 1812 transformedEvent.recycle(); 1813 } else { 1814 event.offsetLocation(offsetX, offsetY); 1815 handled = child.dispatchGenericMotionEvent(event); 1816 event.offsetLocation(-offsetX, -offsetY); 1817 } 1818 return handled; 1819 } 1820 1821 /** 1822 * {@inheritDoc} 1823 */ 1824 @Override 1825 public boolean dispatchTouchEvent(MotionEvent ev) { 1826 if (mInputEventConsistencyVerifier != null) { 1827 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1828 } 1829 1830 boolean handled = false; 1831 if (onFilterTouchEventForSecurity(ev)) { 1832 final int action = ev.getAction(); 1833 final int actionMasked = action & MotionEvent.ACTION_MASK; 1834 1835 // Handle an initial down. 1836 if (actionMasked == MotionEvent.ACTION_DOWN) { 1837 // Throw away all previous state when starting a new touch gesture. 1838 // The framework may have dropped the up or cancel event for the previous gesture 1839 // due to an app switch, ANR, or some other state change. 1840 cancelAndClearTouchTargets(ev); 1841 resetTouchState(); 1842 } 1843 1844 // Check for interception. 1845 final boolean intercepted; 1846 if (actionMasked == MotionEvent.ACTION_DOWN 1847 || mFirstTouchTarget != null) { 1848 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1849 if (!disallowIntercept) { 1850 intercepted = onInterceptTouchEvent(ev); 1851 ev.setAction(action); // restore action in case it was changed 1852 } else { 1853 intercepted = false; 1854 } 1855 } else { 1856 // There are no touch targets and this action is not an initial down 1857 // so this view group continues to intercept touches. 1858 intercepted = true; 1859 } 1860 1861 // Check for cancelation. 1862 final boolean canceled = resetCancelNextUpFlag(this) 1863 || actionMasked == MotionEvent.ACTION_CANCEL; 1864 1865 // Update list of touch targets for pointer down, if needed. 1866 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1867 TouchTarget newTouchTarget = null; 1868 boolean alreadyDispatchedToNewTouchTarget = false; 1869 if (!canceled && !intercepted) { 1870 if (actionMasked == MotionEvent.ACTION_DOWN 1871 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1872 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1873 final int actionIndex = ev.getActionIndex(); // always 0 for down 1874 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1875 : TouchTarget.ALL_POINTER_IDS; 1876 1877 // Clean up earlier touch targets for this pointer id in case they 1878 // have become out of sync. 1879 removePointersFromTouchTargets(idBitsToAssign); 1880 1881 final int childrenCount = mChildrenCount; 1882 if (childrenCount != 0 || mOverlay != null) { 1883 // Find a child that can receive the event. 1884 // Scan children from front to back. 1885 final View[] children = mChildren; 1886 final float x = ev.getX(actionIndex); 1887 final float y = ev.getY(actionIndex); 1888 1889 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1890 for (int i = childrenCount - 1; i >= 0; i--) { 1891 final int childIndex = customOrder ? 1892 getChildDrawingOrder(childrenCount, i) : i; 1893 final View child = children[childIndex]; 1894 if (!canViewReceivePointerEvents(child) 1895 || !isTransformedTouchPointInView(x, y, child, null)) { 1896 continue; 1897 } 1898 1899 newTouchTarget = getTouchTarget(child); 1900 if (newTouchTarget != null) { 1901 // Child is already receiving touch within its bounds. 1902 // Give it the new pointer in addition to the ones it is handling. 1903 newTouchTarget.pointerIdBits |= idBitsToAssign; 1904 break; 1905 } 1906 1907 resetCancelNextUpFlag(child); 1908 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1909 // Child wants to receive touch within its bounds. 1910 mLastTouchDownTime = ev.getDownTime(); 1911 mLastTouchDownIndex = childIndex; 1912 mLastTouchDownX = ev.getX(); 1913 mLastTouchDownY = ev.getY(); 1914 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1915 alreadyDispatchedToNewTouchTarget = true; 1916 break; 1917 } 1918 } 1919 if (mOverlay != null && newTouchTarget == null) { 1920 // Check to see whether the overlay can handle the event 1921 final View child = mOverlay; 1922 if (canViewReceivePointerEvents(child) && 1923 isTransformedTouchPointInView(x, y, child, null)) { 1924 newTouchTarget = getTouchTarget(child); 1925 if (newTouchTarget != null) { 1926 newTouchTarget.pointerIdBits |= idBitsToAssign; 1927 } else { 1928 resetCancelNextUpFlag(child); 1929 if (dispatchTransformedTouchEvent(ev, false, child, 1930 idBitsToAssign)) { 1931 mLastTouchDownTime = ev.getDownTime(); 1932 mLastTouchDownX = ev.getX(); 1933 mLastTouchDownY = ev.getY(); 1934 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1935 alreadyDispatchedToNewTouchTarget = true; 1936 } 1937 } 1938 } 1939 } 1940 } 1941 1942 if (newTouchTarget == null && mFirstTouchTarget != null) { 1943 // Did not find a child to receive the event. 1944 // Assign the pointer to the least recently added target. 1945 newTouchTarget = mFirstTouchTarget; 1946 while (newTouchTarget.next != null) { 1947 newTouchTarget = newTouchTarget.next; 1948 } 1949 newTouchTarget.pointerIdBits |= idBitsToAssign; 1950 } 1951 } 1952 } 1953 1954 // Dispatch to touch targets. 1955 if (mFirstTouchTarget == null) { 1956 // No touch targets so treat this as an ordinary view. 1957 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1958 TouchTarget.ALL_POINTER_IDS); 1959 } else { 1960 // Dispatch to touch targets, excluding the new touch target if we already 1961 // dispatched to it. Cancel touch targets if necessary. 1962 TouchTarget predecessor = null; 1963 TouchTarget target = mFirstTouchTarget; 1964 while (target != null) { 1965 final TouchTarget next = target.next; 1966 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1967 handled = true; 1968 } else { 1969 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1970 || intercepted; 1971 if (dispatchTransformedTouchEvent(ev, cancelChild, 1972 target.child, target.pointerIdBits)) { 1973 handled = true; 1974 } 1975 if (cancelChild) { 1976 if (predecessor == null) { 1977 mFirstTouchTarget = next; 1978 } else { 1979 predecessor.next = next; 1980 } 1981 target.recycle(); 1982 target = next; 1983 continue; 1984 } 1985 } 1986 predecessor = target; 1987 target = next; 1988 } 1989 } 1990 1991 // Update list of touch targets for pointer up or cancel, if needed. 1992 if (canceled 1993 || actionMasked == MotionEvent.ACTION_UP 1994 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1995 resetTouchState(); 1996 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1997 final int actionIndex = ev.getActionIndex(); 1998 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1999 removePointersFromTouchTargets(idBitsToRemove); 2000 } 2001 } 2002 2003 if (!handled && mInputEventConsistencyVerifier != null) { 2004 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2005 } 2006 return handled; 2007 } 2008 2009 /** 2010 * Resets all touch state in preparation for a new cycle. 2011 */ 2012 private void resetTouchState() { 2013 clearTouchTargets(); 2014 resetCancelNextUpFlag(this); 2015 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2016 } 2017 2018 /** 2019 * Resets the cancel next up flag. 2020 * Returns true if the flag was previously set. 2021 */ 2022 private static boolean resetCancelNextUpFlag(View view) { 2023 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2024 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2025 return true; 2026 } 2027 return false; 2028 } 2029 2030 /** 2031 * Clears all touch targets. 2032 */ 2033 private void clearTouchTargets() { 2034 TouchTarget target = mFirstTouchTarget; 2035 if (target != null) { 2036 do { 2037 TouchTarget next = target.next; 2038 target.recycle(); 2039 target = next; 2040 } while (target != null); 2041 mFirstTouchTarget = null; 2042 } 2043 } 2044 2045 /** 2046 * Cancels and clears all touch targets. 2047 */ 2048 private void cancelAndClearTouchTargets(MotionEvent event) { 2049 if (mFirstTouchTarget != null) { 2050 boolean syntheticEvent = false; 2051 if (event == null) { 2052 final long now = SystemClock.uptimeMillis(); 2053 event = MotionEvent.obtain(now, now, 2054 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2055 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2056 syntheticEvent = true; 2057 } 2058 2059 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2060 resetCancelNextUpFlag(target.child); 2061 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2062 } 2063 clearTouchTargets(); 2064 2065 if (syntheticEvent) { 2066 event.recycle(); 2067 } 2068 } 2069 } 2070 2071 /** 2072 * Gets the touch target for specified child view. 2073 * Returns null if not found. 2074 */ 2075 private TouchTarget getTouchTarget(View child) { 2076 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2077 if (target.child == child) { 2078 return target; 2079 } 2080 } 2081 return null; 2082 } 2083 2084 /** 2085 * Adds a touch target for specified child to the beginning of the list. 2086 * Assumes the target child is not already present. 2087 */ 2088 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2089 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2090 target.next = mFirstTouchTarget; 2091 mFirstTouchTarget = target; 2092 return target; 2093 } 2094 2095 /** 2096 * Removes the pointer ids from consideration. 2097 */ 2098 private void removePointersFromTouchTargets(int pointerIdBits) { 2099 TouchTarget predecessor = null; 2100 TouchTarget target = mFirstTouchTarget; 2101 while (target != null) { 2102 final TouchTarget next = target.next; 2103 if ((target.pointerIdBits & pointerIdBits) != 0) { 2104 target.pointerIdBits &= ~pointerIdBits; 2105 if (target.pointerIdBits == 0) { 2106 if (predecessor == null) { 2107 mFirstTouchTarget = next; 2108 } else { 2109 predecessor.next = next; 2110 } 2111 target.recycle(); 2112 target = next; 2113 continue; 2114 } 2115 } 2116 predecessor = target; 2117 target = next; 2118 } 2119 } 2120 2121 private void cancelTouchTarget(View view) { 2122 TouchTarget predecessor = null; 2123 TouchTarget target = mFirstTouchTarget; 2124 while (target != null) { 2125 final TouchTarget next = target.next; 2126 if (target.child == view) { 2127 if (predecessor == null) { 2128 mFirstTouchTarget = next; 2129 } else { 2130 predecessor.next = next; 2131 } 2132 target.recycle(); 2133 2134 final long now = SystemClock.uptimeMillis(); 2135 MotionEvent event = MotionEvent.obtain(now, now, 2136 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2137 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2138 view.dispatchTouchEvent(event); 2139 event.recycle(); 2140 return; 2141 } 2142 predecessor = target; 2143 target = next; 2144 } 2145 } 2146 2147 /** 2148 * Returns true if a child view can receive pointer events. 2149 * @hide 2150 */ 2151 private static boolean canViewReceivePointerEvents(View child) { 2152 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2153 || child.getAnimation() != null; 2154 } 2155 2156 /** 2157 * Returns true if a child view contains the specified point when transformed 2158 * into its coordinate space. 2159 * Child must not be null. 2160 * @hide 2161 */ 2162 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2163 PointF outLocalPoint) { 2164 float localX = x + mScrollX - child.mLeft; 2165 float localY = y + mScrollY - child.mTop; 2166 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2167 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2168 localXY[0] = localX; 2169 localXY[1] = localY; 2170 child.getInverseMatrix().mapPoints(localXY); 2171 localX = localXY[0]; 2172 localY = localXY[1]; 2173 } 2174 final boolean isInView = child.pointInView(localX, localY); 2175 if (isInView && outLocalPoint != null) { 2176 outLocalPoint.set(localX, localY); 2177 } 2178 return isInView; 2179 } 2180 2181 /** 2182 * Transforms a motion event into the coordinate space of a particular child view, 2183 * filters out irrelevant pointer ids, and overrides its action if necessary. 2184 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2185 */ 2186 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2187 View child, int desiredPointerIdBits) { 2188 final boolean handled; 2189 2190 // Canceling motions is a special case. We don't need to perform any transformations 2191 // or filtering. The important part is the action, not the contents. 2192 final int oldAction = event.getAction(); 2193 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2194 event.setAction(MotionEvent.ACTION_CANCEL); 2195 if (child == null) { 2196 handled = super.dispatchTouchEvent(event); 2197 } else { 2198 handled = child.dispatchTouchEvent(event); 2199 } 2200 event.setAction(oldAction); 2201 return handled; 2202 } 2203 2204 // Calculate the number of pointers to deliver. 2205 final int oldPointerIdBits = event.getPointerIdBits(); 2206 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2207 2208 // If for some reason we ended up in an inconsistent state where it looks like we 2209 // might produce a motion event with no pointers in it, then drop the event. 2210 if (newPointerIdBits == 0) { 2211 return false; 2212 } 2213 2214 // If the number of pointers is the same and we don't need to perform any fancy 2215 // irreversible transformations, then we can reuse the motion event for this 2216 // dispatch as long as we are careful to revert any changes we make. 2217 // Otherwise we need to make a copy. 2218 final MotionEvent transformedEvent; 2219 if (newPointerIdBits == oldPointerIdBits) { 2220 if (child == null || child.hasIdentityMatrix()) { 2221 if (child == null) { 2222 handled = super.dispatchTouchEvent(event); 2223 } else { 2224 final float offsetX = mScrollX - child.mLeft; 2225 final float offsetY = mScrollY - child.mTop; 2226 event.offsetLocation(offsetX, offsetY); 2227 2228 handled = child.dispatchTouchEvent(event); 2229 2230 event.offsetLocation(-offsetX, -offsetY); 2231 } 2232 return handled; 2233 } 2234 transformedEvent = MotionEvent.obtain(event); 2235 } else { 2236 transformedEvent = event.split(newPointerIdBits); 2237 } 2238 2239 // Perform any necessary transformations and dispatch. 2240 if (child == null) { 2241 handled = super.dispatchTouchEvent(transformedEvent); 2242 } else { 2243 final float offsetX = mScrollX - child.mLeft; 2244 final float offsetY = mScrollY - child.mTop; 2245 transformedEvent.offsetLocation(offsetX, offsetY); 2246 if (! child.hasIdentityMatrix()) { 2247 transformedEvent.transform(child.getInverseMatrix()); 2248 } 2249 2250 handled = child.dispatchTouchEvent(transformedEvent); 2251 } 2252 2253 // Done. 2254 transformedEvent.recycle(); 2255 return handled; 2256 } 2257 2258 /** 2259 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2260 * dispatch. This behavior is enabled by default for applications that target an 2261 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2262 * 2263 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2264 * views depending on where each pointer initially went down. This allows for user interactions 2265 * such as scrolling two panes of content independently, chording of buttons, and performing 2266 * independent gestures on different pieces of content. 2267 * 2268 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2269 * child views. <code>false</code> to only allow one child view to be the target of 2270 * any MotionEvent received by this ViewGroup. 2271 */ 2272 public void setMotionEventSplittingEnabled(boolean split) { 2273 // TODO Applications really shouldn't change this setting mid-touch event, 2274 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2275 // with gestures in progress when this is changed. 2276 if (split) { 2277 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2278 } else { 2279 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2280 } 2281 } 2282 2283 /** 2284 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2285 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2286 */ 2287 public boolean isMotionEventSplittingEnabled() { 2288 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2289 } 2290 2291 /** 2292 * {@inheritDoc} 2293 */ 2294 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2295 2296 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2297 // We're already in this state, assume our ancestors are too 2298 return; 2299 } 2300 2301 if (disallowIntercept) { 2302 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2303 } else { 2304 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2305 } 2306 2307 // Pass it up to our parent 2308 if (mParent != null) { 2309 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2310 } 2311 } 2312 2313 /** 2314 * Implement this method to intercept all touch screen motion events. This 2315 * allows you to watch events as they are dispatched to your children, and 2316 * take ownership of the current gesture at any point. 2317 * 2318 * <p>Using this function takes some care, as it has a fairly complicated 2319 * interaction with {@link View#onTouchEvent(MotionEvent) 2320 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2321 * that method as well as this one in the correct way. Events will be 2322 * received in the following order: 2323 * 2324 * <ol> 2325 * <li> You will receive the down event here. 2326 * <li> The down event will be handled either by a child of this view 2327 * group, or given to your own onTouchEvent() method to handle; this means 2328 * you should implement onTouchEvent() to return true, so you will 2329 * continue to see the rest of the gesture (instead of looking for 2330 * a parent view to handle it). Also, by returning true from 2331 * onTouchEvent(), you will not receive any following 2332 * events in onInterceptTouchEvent() and all touch processing must 2333 * happen in onTouchEvent() like normal. 2334 * <li> For as long as you return false from this function, each following 2335 * event (up to and including the final up) will be delivered first here 2336 * and then to the target's onTouchEvent(). 2337 * <li> If you return true from here, you will not receive any 2338 * following events: the target view will receive the same event but 2339 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2340 * events will be delivered to your onTouchEvent() method and no longer 2341 * appear here. 2342 * </ol> 2343 * 2344 * @param ev The motion event being dispatched down the hierarchy. 2345 * @return Return true to steal motion events from the children and have 2346 * them dispatched to this ViewGroup through onTouchEvent(). 2347 * The current target will receive an ACTION_CANCEL event, and no further 2348 * messages will be delivered here. 2349 */ 2350 public boolean onInterceptTouchEvent(MotionEvent ev) { 2351 return false; 2352 } 2353 2354 /** 2355 * {@inheritDoc} 2356 * 2357 * Looks for a view to give focus to respecting the setting specified by 2358 * {@link #getDescendantFocusability()}. 2359 * 2360 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2361 * find focus within the children of this group when appropriate. 2362 * 2363 * @see #FOCUS_BEFORE_DESCENDANTS 2364 * @see #FOCUS_AFTER_DESCENDANTS 2365 * @see #FOCUS_BLOCK_DESCENDANTS 2366 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2367 */ 2368 @Override 2369 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2370 if (DBG) { 2371 System.out.println(this + " ViewGroup.requestFocus direction=" 2372 + direction); 2373 } 2374 int descendantFocusability = getDescendantFocusability(); 2375 2376 switch (descendantFocusability) { 2377 case FOCUS_BLOCK_DESCENDANTS: 2378 return super.requestFocus(direction, previouslyFocusedRect); 2379 case FOCUS_BEFORE_DESCENDANTS: { 2380 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2381 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2382 } 2383 case FOCUS_AFTER_DESCENDANTS: { 2384 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2385 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2386 } 2387 default: 2388 throw new IllegalStateException("descendant focusability must be " 2389 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2390 + "but is " + descendantFocusability); 2391 } 2392 } 2393 2394 /** 2395 * Look for a descendant to call {@link View#requestFocus} on. 2396 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2397 * when it wants to request focus within its children. Override this to 2398 * customize how your {@link ViewGroup} requests focus within its children. 2399 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2400 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2401 * to give a finer grained hint about where focus is coming from. May be null 2402 * if there is no hint. 2403 * @return Whether focus was taken. 2404 */ 2405 @SuppressWarnings({"ConstantConditions"}) 2406 protected boolean onRequestFocusInDescendants(int direction, 2407 Rect previouslyFocusedRect) { 2408 int index; 2409 int increment; 2410 int end; 2411 int count = mChildrenCount; 2412 if ((direction & FOCUS_FORWARD) != 0) { 2413 index = 0; 2414 increment = 1; 2415 end = count; 2416 } else { 2417 index = count - 1; 2418 increment = -1; 2419 end = -1; 2420 } 2421 final View[] children = mChildren; 2422 for (int i = index; i != end; i += increment) { 2423 View child = children[i]; 2424 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2425 if (child.requestFocus(direction, previouslyFocusedRect)) { 2426 return true; 2427 } 2428 } 2429 } 2430 return false; 2431 } 2432 2433 /** 2434 * {@inheritDoc} 2435 * 2436 * @hide 2437 */ 2438 @Override 2439 public void dispatchStartTemporaryDetach() { 2440 super.dispatchStartTemporaryDetach(); 2441 final int count = mChildrenCount; 2442 final View[] children = mChildren; 2443 for (int i = 0; i < count; i++) { 2444 children[i].dispatchStartTemporaryDetach(); 2445 } 2446 } 2447 2448 /** 2449 * {@inheritDoc} 2450 * 2451 * @hide 2452 */ 2453 @Override 2454 public void dispatchFinishTemporaryDetach() { 2455 super.dispatchFinishTemporaryDetach(); 2456 final int count = mChildrenCount; 2457 final View[] children = mChildren; 2458 for (int i = 0; i < count; i++) { 2459 children[i].dispatchFinishTemporaryDetach(); 2460 } 2461 } 2462 2463 /** 2464 * {@inheritDoc} 2465 */ 2466 @Override 2467 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2468 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2469 super.dispatchAttachedToWindow(info, visibility); 2470 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2471 2472 final int count = mChildrenCount; 2473 final View[] children = mChildren; 2474 for (int i = 0; i < count; i++) { 2475 final View child = children[i]; 2476 child.dispatchAttachedToWindow(info, 2477 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2478 } 2479 } 2480 2481 @Override 2482 void dispatchScreenStateChanged(int screenState) { 2483 super.dispatchScreenStateChanged(screenState); 2484 2485 final int count = mChildrenCount; 2486 final View[] children = mChildren; 2487 for (int i = 0; i < count; i++) { 2488 children[i].dispatchScreenStateChanged(screenState); 2489 } 2490 } 2491 2492 @Override 2493 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2494 boolean handled = false; 2495 if (includeForAccessibility()) { 2496 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2497 if (handled) { 2498 return handled; 2499 } 2500 } 2501 // Let our children have a shot in populating the event. 2502 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2503 try { 2504 final int childCount = children.getChildCount(); 2505 for (int i = 0; i < childCount; i++) { 2506 View child = children.getChildAt(i); 2507 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2508 handled = child.dispatchPopulateAccessibilityEvent(event); 2509 if (handled) { 2510 return handled; 2511 } 2512 } 2513 } 2514 } finally { 2515 children.recycle(); 2516 } 2517 return false; 2518 } 2519 2520 @Override 2521 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2522 super.onInitializeAccessibilityNodeInfoInternal(info); 2523 if (mAttachInfo != null) { 2524 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2525 childrenForAccessibility.clear(); 2526 addChildrenForAccessibility(childrenForAccessibility); 2527 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2528 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2529 View child = childrenForAccessibility.get(i); 2530 info.addChild(child); 2531 } 2532 childrenForAccessibility.clear(); 2533 } 2534 } 2535 2536 @Override 2537 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2538 super.onInitializeAccessibilityEventInternal(event); 2539 event.setClassName(ViewGroup.class.getName()); 2540 } 2541 2542 /** 2543 * @hide 2544 */ 2545 @Override 2546 public void resetAccessibilityStateChanged() { 2547 super.resetAccessibilityStateChanged(); 2548 View[] children = mChildren; 2549 final int childCount = mChildrenCount; 2550 for (int i = 0; i < childCount; i++) { 2551 View child = children[i]; 2552 child.resetAccessibilityStateChanged(); 2553 } 2554 } 2555 2556 /** 2557 * {@inheritDoc} 2558 */ 2559 @Override 2560 void dispatchDetachedFromWindow() { 2561 // If we still have a touch target, we are still in the process of 2562 // dispatching motion events to a child; we need to get rid of that 2563 // child to avoid dispatching events to it after the window is torn 2564 // down. To make sure we keep the child in a consistent state, we 2565 // first send it an ACTION_CANCEL motion event. 2566 cancelAndClearTouchTargets(null); 2567 2568 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2569 exitHoverTargets(); 2570 2571 // In case view is detached while transition is running 2572 mLayoutSuppressed = false; 2573 2574 // Tear down our drag tracking 2575 mDragNotifiedChildren = null; 2576 if (mCurrentDrag != null) { 2577 mCurrentDrag.recycle(); 2578 mCurrentDrag = null; 2579 } 2580 2581 final int count = mChildrenCount; 2582 final View[] children = mChildren; 2583 for (int i = 0; i < count; i++) { 2584 children[i].dispatchDetachedFromWindow(); 2585 } 2586 super.dispatchDetachedFromWindow(); 2587 } 2588 2589 /** 2590 * @hide 2591 */ 2592 @Override 2593 protected void internalSetPadding(int left, int top, int right, int bottom) { 2594 super.internalSetPadding(left, top, right, bottom); 2595 2596 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2597 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2598 } else { 2599 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2600 } 2601 } 2602 2603 /** 2604 * {@inheritDoc} 2605 */ 2606 @Override 2607 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2608 super.dispatchSaveInstanceState(container); 2609 final int count = mChildrenCount; 2610 final View[] children = mChildren; 2611 for (int i = 0; i < count; i++) { 2612 View c = children[i]; 2613 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2614 c.dispatchSaveInstanceState(container); 2615 } 2616 } 2617 } 2618 2619 /** 2620 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2621 * to only this view, not to its children. For use when overriding 2622 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2623 * subclasses to freeze their own state but not the state of their children. 2624 * 2625 * @param container the container 2626 */ 2627 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2628 super.dispatchSaveInstanceState(container); 2629 } 2630 2631 /** 2632 * {@inheritDoc} 2633 */ 2634 @Override 2635 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2636 super.dispatchRestoreInstanceState(container); 2637 final int count = mChildrenCount; 2638 final View[] children = mChildren; 2639 for (int i = 0; i < count; i++) { 2640 View c = children[i]; 2641 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2642 c.dispatchRestoreInstanceState(container); 2643 } 2644 } 2645 } 2646 2647 /** 2648 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2649 * to only this view, not to its children. For use when overriding 2650 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2651 * subclasses to thaw their own state but not the state of their children. 2652 * 2653 * @param container the container 2654 */ 2655 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2656 super.dispatchRestoreInstanceState(container); 2657 } 2658 2659 /** 2660 * Enables or disables the drawing cache for each child of this view group. 2661 * 2662 * @param enabled true to enable the cache, false to dispose of it 2663 */ 2664 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2665 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2666 final View[] children = mChildren; 2667 final int count = mChildrenCount; 2668 for (int i = 0; i < count; i++) { 2669 children[i].setDrawingCacheEnabled(enabled); 2670 } 2671 } 2672 } 2673 2674 @Override 2675 protected void onAnimationStart() { 2676 super.onAnimationStart(); 2677 2678 // When this ViewGroup's animation starts, build the cache for the children 2679 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2680 final int count = mChildrenCount; 2681 final View[] children = mChildren; 2682 final boolean buildCache = !isHardwareAccelerated(); 2683 2684 for (int i = 0; i < count; i++) { 2685 final View child = children[i]; 2686 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2687 child.setDrawingCacheEnabled(true); 2688 if (buildCache) { 2689 child.buildDrawingCache(true); 2690 } 2691 } 2692 } 2693 2694 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2695 } 2696 } 2697 2698 @Override 2699 protected void onAnimationEnd() { 2700 super.onAnimationEnd(); 2701 2702 // When this ViewGroup's animation ends, destroy the cache of the children 2703 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2704 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2705 2706 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2707 setChildrenDrawingCacheEnabled(false); 2708 } 2709 } 2710 } 2711 2712 @Override 2713 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2714 int count = mChildrenCount; 2715 int[] visibilities = null; 2716 2717 if (skipChildren) { 2718 visibilities = new int[count]; 2719 for (int i = 0; i < count; i++) { 2720 View child = getChildAt(i); 2721 visibilities[i] = child.getVisibility(); 2722 if (visibilities[i] == View.VISIBLE) { 2723 child.setVisibility(INVISIBLE); 2724 } 2725 } 2726 } 2727 2728 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2729 2730 if (skipChildren) { 2731 for (int i = 0; i < count; i++) { 2732 getChildAt(i).setVisibility(visibilities[i]); 2733 } 2734 } 2735 2736 return b; 2737 } 2738 2739 /** Return true if this ViewGroup is laying out using optical bounds. */ 2740 boolean isLayoutModeOptical() { 2741 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2742 } 2743 2744 Insets computeOpticalInsets() { 2745 if (isLayoutModeOptical()) { 2746 int left = 0; 2747 int top = 0; 2748 int right = 0; 2749 int bottom = 0; 2750 for (int i = 0; i < mChildrenCount; i++) { 2751 View child = getChildAt(i); 2752 if (child.getVisibility() == VISIBLE) { 2753 Insets insets = child.getOpticalInsets(); 2754 left = Math.max(left, insets.left); 2755 top = Math.max(top, insets.top); 2756 right = Math.max(right, insets.right); 2757 bottom = Math.max(bottom, insets.bottom); 2758 } 2759 } 2760 return Insets.of(left, top, right, bottom); 2761 } else { 2762 return Insets.NONE; 2763 } 2764 } 2765 2766 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2767 if (x1 != x2 && y1 != y2) { 2768 if (x1 > x2) { 2769 int tmp = x1; x1 = x2; x2 = tmp; 2770 } 2771 if (y1 > y2) { 2772 int tmp = y1; y1 = y2; y2 = tmp; 2773 } 2774 canvas.drawRect(x1, y1, x2, y2, paint); 2775 } 2776 } 2777 2778 private static int sign(int x) { 2779 return (x >= 0) ? 1 : -1; 2780 } 2781 2782 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2783 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2784 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2785 } 2786 2787 private int dipsToPixels(int dips) { 2788 float scale = getContext().getResources().getDisplayMetrics().density; 2789 return (int) (dips * scale + 0.5f); 2790 } 2791 2792 private void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2793 int lineLength, int lineWidth) { 2794 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2795 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2796 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2797 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2798 } 2799 2800 private static void fillDifference(Canvas canvas, 2801 int x2, int y2, int x3, int y3, 2802 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2803 int x1 = x2 - dx1; 2804 int y1 = y2 - dy1; 2805 2806 int x4 = x3 + dx2; 2807 int y4 = y3 + dy2; 2808 2809 fillRect(canvas, paint, x1, y1, x4, y2); 2810 fillRect(canvas, paint, x1, y2, x2, y3); 2811 fillRect(canvas, paint, x3, y2, x4, y3); 2812 fillRect(canvas, paint, x1, y3, x4, y4); 2813 } 2814 2815 /** 2816 * @hide 2817 */ 2818 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2819 for (int i = 0; i < getChildCount(); i++) { 2820 View c = getChildAt(i); 2821 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2822 } 2823 } 2824 2825 /** 2826 * @hide 2827 */ 2828 protected void onDebugDraw(Canvas canvas) { 2829 Paint paint = getDebugPaint(); 2830 2831 // Draw optical bounds 2832 { 2833 paint.setColor(Color.RED); 2834 paint.setStyle(Paint.Style.STROKE); 2835 2836 for (int i = 0; i < getChildCount(); i++) { 2837 View c = getChildAt(i); 2838 Insets insets = c.getOpticalInsets(); 2839 2840 drawRect(canvas, paint, 2841 c.getLeft() + insets.left, 2842 c.getTop() + insets.top, 2843 c.getRight() - insets.right - 1, 2844 c.getBottom() - insets.bottom - 1); 2845 } 2846 } 2847 2848 // Draw margins 2849 { 2850 paint.setColor(Color.argb(63, 255, 0, 255)); 2851 paint.setStyle(Paint.Style.FILL); 2852 2853 onDebugDrawMargins(canvas, paint); 2854 } 2855 2856 // Draw clip bounds 2857 { 2858 paint.setColor(Color.rgb(63, 127, 255)); 2859 paint.setStyle(Paint.Style.FILL); 2860 2861 int lineLength = dipsToPixels(8); 2862 int lineWidth = dipsToPixels(1); 2863 for (int i = 0; i < getChildCount(); i++) { 2864 View c = getChildAt(i); 2865 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2866 paint, lineLength, lineWidth); 2867 } 2868 } 2869 } 2870 2871 /** 2872 * {@inheritDoc} 2873 */ 2874 @Override 2875 protected void dispatchDraw(Canvas canvas) { 2876 final int count = mChildrenCount; 2877 final View[] children = mChildren; 2878 int flags = mGroupFlags; 2879 2880 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2881 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2882 2883 final boolean buildCache = !isHardwareAccelerated(); 2884 for (int i = 0; i < count; i++) { 2885 final View child = children[i]; 2886 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2887 final LayoutParams params = child.getLayoutParams(); 2888 attachLayoutAnimationParameters(child, params, i, count); 2889 bindLayoutAnimation(child); 2890 if (cache) { 2891 child.setDrawingCacheEnabled(true); 2892 if (buildCache) { 2893 child.buildDrawingCache(true); 2894 } 2895 } 2896 } 2897 } 2898 2899 final LayoutAnimationController controller = mLayoutAnimationController; 2900 if (controller.willOverlap()) { 2901 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2902 } 2903 2904 controller.start(); 2905 2906 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2907 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2908 2909 if (cache) { 2910 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2911 } 2912 2913 if (mAnimationListener != null) { 2914 mAnimationListener.onAnimationStart(controller.getAnimation()); 2915 } 2916 } 2917 2918 int saveCount = 0; 2919 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2920 if (clipToPadding) { 2921 saveCount = canvas.save(); 2922 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2923 mScrollX + mRight - mLeft - mPaddingRight, 2924 mScrollY + mBottom - mTop - mPaddingBottom); 2925 2926 } 2927 2928 // We will draw our child's animation, let's reset the flag 2929 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2930 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2931 2932 boolean more = false; 2933 final long drawingTime = getDrawingTime(); 2934 2935 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2936 for (int i = 0; i < count; i++) { 2937 final View child = children[i]; 2938 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2939 more |= drawChild(canvas, child, drawingTime); 2940 } 2941 } 2942 } else { 2943 for (int i = 0; i < count; i++) { 2944 final View child = children[getChildDrawingOrder(count, i)]; 2945 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2946 more |= drawChild(canvas, child, drawingTime); 2947 } 2948 } 2949 } 2950 2951 // Draw any disappearing views that have animations 2952 if (mDisappearingChildren != null) { 2953 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2954 final int disappearingCount = disappearingChildren.size() - 1; 2955 // Go backwards -- we may delete as animations finish 2956 for (int i = disappearingCount; i >= 0; i--) { 2957 final View child = disappearingChildren.get(i); 2958 more |= drawChild(canvas, child, drawingTime); 2959 } 2960 } 2961 2962 if (debugDraw()) { 2963 onDebugDraw(canvas); 2964 } 2965 2966 if (clipToPadding) { 2967 canvas.restoreToCount(saveCount); 2968 } 2969 2970 // mGroupFlags might have been updated by drawChild() 2971 flags = mGroupFlags; 2972 2973 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2974 invalidate(true); 2975 } 2976 2977 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2978 mLayoutAnimationController.isDone() && !more) { 2979 // We want to erase the drawing cache and notify the listener after the 2980 // next frame is drawn because one extra invalidate() is caused by 2981 // drawChild() after the animation is over 2982 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2983 final Runnable end = new Runnable() { 2984 public void run() { 2985 notifyAnimationListener(); 2986 } 2987 }; 2988 post(end); 2989 } 2990 } 2991 2992 /** 2993 * Returns the index of the child to draw for this iteration. Override this 2994 * if you want to change the drawing order of children. By default, it 2995 * returns i. 2996 * <p> 2997 * NOTE: In order for this method to be called, you must enable child ordering 2998 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2999 * 3000 * @param i The current iteration. 3001 * @return The index of the child to draw this iteration. 3002 * 3003 * @see #setChildrenDrawingOrderEnabled(boolean) 3004 * @see #isChildrenDrawingOrderEnabled() 3005 */ 3006 protected int getChildDrawingOrder(int childCount, int i) { 3007 return i; 3008 } 3009 3010 private void notifyAnimationListener() { 3011 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3012 mGroupFlags |= FLAG_ANIMATION_DONE; 3013 3014 if (mAnimationListener != null) { 3015 final Runnable end = new Runnable() { 3016 public void run() { 3017 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3018 } 3019 }; 3020 post(end); 3021 } 3022 3023 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3024 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3025 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3026 setChildrenDrawingCacheEnabled(false); 3027 } 3028 } 3029 3030 invalidate(true); 3031 } 3032 3033 /** 3034 * This method is used to cause children of this ViewGroup to restore or recreate their 3035 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3036 * to recreate its own display list, which would happen if it went through the normal 3037 * draw/dispatchDraw mechanisms. 3038 * 3039 * @hide 3040 */ 3041 @Override 3042 protected void dispatchGetDisplayList() { 3043 final int count = mChildrenCount; 3044 final View[] children = mChildren; 3045 for (int i = 0; i < count; i++) { 3046 final View child = children[i]; 3047 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3048 child.hasStaticLayer()) { 3049 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3050 == PFLAG_INVALIDATED; 3051 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3052 child.getDisplayList(); 3053 child.mRecreateDisplayList = false; 3054 } 3055 } 3056 if (mOverlay != null) { 3057 mOverlay.mRecreateDisplayList = (mOverlay.mPrivateFlags & PFLAG_INVALIDATED) 3058 == PFLAG_INVALIDATED; 3059 mOverlay.mPrivateFlags &= ~PFLAG_INVALIDATED; 3060 mOverlay.getDisplayList(); 3061 mOverlay.mRecreateDisplayList = false; 3062 } 3063 } 3064 3065 /** 3066 * Draw one child of this View Group. This method is responsible for getting 3067 * the canvas in the right state. This includes clipping, translating so 3068 * that the child's scrolled origin is at 0, 0, and applying any animation 3069 * transformations. 3070 * 3071 * @param canvas The canvas on which to draw the child 3072 * @param child Who to draw 3073 * @param drawingTime The time at which draw is occurring 3074 * @return True if an invalidate() was issued 3075 */ 3076 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3077 return child.draw(canvas, this, drawingTime); 3078 } 3079 3080 /** 3081 * By default, children are clipped to their bounds before drawing. This 3082 * allows view groups to override this behavior for animations, etc. 3083 * 3084 * @param clipChildren true to clip children to their bounds, 3085 * false otherwise 3086 * @attr ref android.R.styleable#ViewGroup_clipChildren 3087 */ 3088 public void setClipChildren(boolean clipChildren) { 3089 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3090 if (clipChildren != previousValue) { 3091 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3092 for (int i = 0; i < mChildrenCount; ++i) { 3093 View child = getChildAt(i); 3094 if (child.mDisplayList != null) { 3095 child.mDisplayList.setClipChildren(clipChildren); 3096 } 3097 } 3098 } 3099 } 3100 3101 /** 3102 * By default, children are clipped to the padding of the ViewGroup. This 3103 * allows view groups to override this behavior 3104 * 3105 * @param clipToPadding true to clip children to the padding of the 3106 * group, false otherwise 3107 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3108 */ 3109 public void setClipToPadding(boolean clipToPadding) { 3110 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3111 } 3112 3113 /** 3114 * {@inheritDoc} 3115 */ 3116 @Override 3117 public void dispatchSetSelected(boolean selected) { 3118 final View[] children = mChildren; 3119 final int count = mChildrenCount; 3120 for (int i = 0; i < count; i++) { 3121 children[i].setSelected(selected); 3122 } 3123 } 3124 3125 /** 3126 * {@inheritDoc} 3127 */ 3128 @Override 3129 public void dispatchSetActivated(boolean activated) { 3130 final View[] children = mChildren; 3131 final int count = mChildrenCount; 3132 for (int i = 0; i < count; i++) { 3133 children[i].setActivated(activated); 3134 } 3135 } 3136 3137 @Override 3138 protected void dispatchSetPressed(boolean pressed) { 3139 final View[] children = mChildren; 3140 final int count = mChildrenCount; 3141 for (int i = 0; i < count; i++) { 3142 final View child = children[i]; 3143 // Children that are clickable on their own should not 3144 // show a pressed state when their parent view does. 3145 // Clearing a pressed state always propagates. 3146 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3147 child.setPressed(pressed); 3148 } 3149 } 3150 } 3151 3152 /** 3153 * When this property is set to true, this ViewGroup supports static transformations on 3154 * children; this causes 3155 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3156 * invoked when a child is drawn. 3157 * 3158 * Any subclass overriding 3159 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3160 * set this property to true. 3161 * 3162 * @param enabled True to enable static transformations on children, false otherwise. 3163 * 3164 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3165 */ 3166 protected void setStaticTransformationsEnabled(boolean enabled) { 3167 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3168 } 3169 3170 /** 3171 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3172 * boolean to indicate whether a static transform was set. The default implementation 3173 * simply returns <code>false</code>; subclasses may override this method for different 3174 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3175 * for this method to be called. 3176 * 3177 * @param child The child view whose static transform is being requested 3178 * @param t The Transformation which will hold the result 3179 * @return true if the transformation was set, false otherwise 3180 * @see #setStaticTransformationsEnabled(boolean) 3181 */ 3182 protected boolean getChildStaticTransformation(View child, Transformation t) { 3183 return false; 3184 } 3185 3186 /** 3187 * {@hide} 3188 */ 3189 @Override 3190 protected View findViewTraversal(int id) { 3191 if (id == mID) { 3192 return this; 3193 } 3194 3195 final View[] where = mChildren; 3196 final int len = mChildrenCount; 3197 3198 for (int i = 0; i < len; i++) { 3199 View v = where[i]; 3200 3201 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3202 v = v.findViewById(id); 3203 3204 if (v != null) { 3205 return v; 3206 } 3207 } 3208 } 3209 3210 return null; 3211 } 3212 3213 /** 3214 * {@hide} 3215 */ 3216 @Override 3217 protected View findViewWithTagTraversal(Object tag) { 3218 if (tag != null && tag.equals(mTag)) { 3219 return this; 3220 } 3221 3222 final View[] where = mChildren; 3223 final int len = mChildrenCount; 3224 3225 for (int i = 0; i < len; i++) { 3226 View v = where[i]; 3227 3228 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3229 v = v.findViewWithTag(tag); 3230 3231 if (v != null) { 3232 return v; 3233 } 3234 } 3235 } 3236 3237 return null; 3238 } 3239 3240 /** 3241 * {@hide} 3242 */ 3243 @Override 3244 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3245 if (predicate.apply(this)) { 3246 return this; 3247 } 3248 3249 final View[] where = mChildren; 3250 final int len = mChildrenCount; 3251 3252 for (int i = 0; i < len; i++) { 3253 View v = where[i]; 3254 3255 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3256 v = v.findViewByPredicate(predicate); 3257 3258 if (v != null) { 3259 return v; 3260 } 3261 } 3262 } 3263 3264 return null; 3265 } 3266 3267 /** 3268 * <p>Adds a child view. If no layout parameters are already set on the child, the 3269 * default parameters for this ViewGroup are set on the child.</p> 3270 * 3271 * <p><strong>Note:</strong> do not invoke this method from 3272 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3273 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3274 * 3275 * @param child the child view to add 3276 * 3277 * @see #generateDefaultLayoutParams() 3278 */ 3279 public void addView(View child) { 3280 addView(child, -1); 3281 } 3282 3283 /** 3284 * Adds a child view. If no layout parameters are already set on the child, the 3285 * default parameters for this ViewGroup are set on the child. 3286 * 3287 * <p><strong>Note:</strong> do not invoke this method from 3288 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3289 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3290 * 3291 * @param child the child view to add 3292 * @param index the position at which to add the child 3293 * 3294 * @see #generateDefaultLayoutParams() 3295 */ 3296 public void addView(View child, int index) { 3297 LayoutParams params = child.getLayoutParams(); 3298 if (params == null) { 3299 params = generateDefaultLayoutParams(); 3300 if (params == null) { 3301 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3302 } 3303 } 3304 addView(child, index, params); 3305 } 3306 3307 /** 3308 * Adds a child view with this ViewGroup's default layout parameters and the 3309 * specified width and height. 3310 * 3311 * <p><strong>Note:</strong> do not invoke this method from 3312 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3313 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3314 * 3315 * @param child the child view to add 3316 */ 3317 public void addView(View child, int width, int height) { 3318 final LayoutParams params = generateDefaultLayoutParams(); 3319 params.width = width; 3320 params.height = height; 3321 addView(child, -1, params); 3322 } 3323 3324 /** 3325 * Adds a child view with the specified layout parameters. 3326 * 3327 * <p><strong>Note:</strong> do not invoke this method from 3328 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3329 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3330 * 3331 * @param child the child view to add 3332 * @param params the layout parameters to set on the child 3333 */ 3334 public void addView(View child, LayoutParams params) { 3335 addView(child, -1, params); 3336 } 3337 3338 /** 3339 * Adds a child view with the specified layout parameters. 3340 * 3341 * <p><strong>Note:</strong> do not invoke this method from 3342 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3343 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3344 * 3345 * @param child the child view to add 3346 * @param index the position at which to add the child 3347 * @param params the layout parameters to set on the child 3348 */ 3349 public void addView(View child, int index, LayoutParams params) { 3350 if (DBG) { 3351 System.out.println(this + " addView"); 3352 } 3353 3354 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3355 // therefore, we call requestLayout() on ourselves before, so that the child's request 3356 // will be blocked at our level 3357 requestLayout(); 3358 invalidate(true); 3359 addViewInner(child, index, params, false); 3360 } 3361 3362 /** 3363 * {@inheritDoc} 3364 */ 3365 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3366 if (!checkLayoutParams(params)) { 3367 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3368 } 3369 if (view.mParent != this) { 3370 throw new IllegalArgumentException("Given view not a child of " + this); 3371 } 3372 view.setLayoutParams(params); 3373 } 3374 3375 /** 3376 * {@inheritDoc} 3377 */ 3378 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3379 return p != null; 3380 } 3381 3382 /** 3383 * Interface definition for a callback to be invoked when the hierarchy 3384 * within this view changed. The hierarchy changes whenever a child is added 3385 * to or removed from this view. 3386 */ 3387 public interface OnHierarchyChangeListener { 3388 /** 3389 * Called when a new child is added to a parent view. 3390 * 3391 * @param parent the view in which a child was added 3392 * @param child the new child view added in the hierarchy 3393 */ 3394 void onChildViewAdded(View parent, View child); 3395 3396 /** 3397 * Called when a child is removed from a parent view. 3398 * 3399 * @param parent the view from which the child was removed 3400 * @param child the child removed from the hierarchy 3401 */ 3402 void onChildViewRemoved(View parent, View child); 3403 } 3404 3405 /** 3406 * Register a callback to be invoked when a child is added to or removed 3407 * from this view. 3408 * 3409 * @param listener the callback to invoke on hierarchy change 3410 */ 3411 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3412 mOnHierarchyChangeListener = listener; 3413 } 3414 3415 /** 3416 * @hide 3417 */ 3418 protected void onViewAdded(View child) { 3419 if (mOnHierarchyChangeListener != null) { 3420 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3421 } 3422 } 3423 3424 /** 3425 * @hide 3426 */ 3427 protected void onViewRemoved(View child) { 3428 if (mOnHierarchyChangeListener != null) { 3429 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3430 } 3431 } 3432 3433 private void clearCachedLayoutMode() { 3434 if (!getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3435 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3436 } 3437 } 3438 3439 @Override 3440 protected void onAttachedToWindow() { 3441 super.onAttachedToWindow(); 3442 clearCachedLayoutMode(); 3443 } 3444 3445 @Override 3446 protected void onDetachedFromWindow() { 3447 super.onDetachedFromWindow(); 3448 clearCachedLayoutMode(); 3449 } 3450 3451 /** 3452 * Adds a view during layout. This is useful if in your onLayout() method, 3453 * you need to add more views (as does the list view for example). 3454 * 3455 * If index is negative, it means put it at the end of the list. 3456 * 3457 * @param child the view to add to the group 3458 * @param index the index at which the child must be added 3459 * @param params the layout parameters to associate with the child 3460 * @return true if the child was added, false otherwise 3461 */ 3462 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3463 return addViewInLayout(child, index, params, false); 3464 } 3465 3466 /** 3467 * Adds a view during layout. This is useful if in your onLayout() method, 3468 * you need to add more views (as does the list view for example). 3469 * 3470 * If index is negative, it means put it at the end of the list. 3471 * 3472 * @param child the view to add to the group 3473 * @param index the index at which the child must be added 3474 * @param params the layout parameters to associate with the child 3475 * @param preventRequestLayout if true, calling this method will not trigger a 3476 * layout request on child 3477 * @return true if the child was added, false otherwise 3478 */ 3479 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3480 boolean preventRequestLayout) { 3481 child.mParent = null; 3482 addViewInner(child, index, params, preventRequestLayout); 3483 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3484 return true; 3485 } 3486 3487 /** 3488 * Prevents the specified child to be laid out during the next layout pass. 3489 * 3490 * @param child the child on which to perform the cleanup 3491 */ 3492 protected void cleanupLayoutState(View child) { 3493 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3494 } 3495 3496 private void addViewInner(View child, int index, LayoutParams params, 3497 boolean preventRequestLayout) { 3498 3499 if (mTransition != null) { 3500 // Don't prevent other add transitions from completing, but cancel remove 3501 // transitions to let them complete the process before we add to the container 3502 mTransition.cancel(LayoutTransition.DISAPPEARING); 3503 } 3504 3505 if (child.getParent() != null) { 3506 throw new IllegalStateException("The specified child already has a parent. " + 3507 "You must call removeView() on the child's parent first."); 3508 } 3509 3510 if (mTransition != null) { 3511 mTransition.addChild(this, child); 3512 } 3513 3514 if (!checkLayoutParams(params)) { 3515 params = generateLayoutParams(params); 3516 } 3517 3518 if (preventRequestLayout) { 3519 child.mLayoutParams = params; 3520 } else { 3521 child.setLayoutParams(params); 3522 } 3523 3524 if (index < 0) { 3525 index = mChildrenCount; 3526 } 3527 3528 addInArray(child, index); 3529 3530 // tell our children 3531 if (preventRequestLayout) { 3532 child.assignParent(this); 3533 } else { 3534 child.mParent = this; 3535 } 3536 3537 if (child.hasFocus()) { 3538 requestChildFocus(child, child.findFocus()); 3539 } 3540 3541 AttachInfo ai = mAttachInfo; 3542 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3543 boolean lastKeepOn = ai.mKeepScreenOn; 3544 ai.mKeepScreenOn = false; 3545 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3546 if (ai.mKeepScreenOn) { 3547 needGlobalAttributesUpdate(true); 3548 } 3549 ai.mKeepScreenOn = lastKeepOn; 3550 } 3551 3552 if (child.isLayoutDirectionInherited()) { 3553 child.resetRtlProperties(); 3554 } 3555 3556 onViewAdded(child); 3557 3558 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3559 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3560 } 3561 3562 if (child.hasTransientState()) { 3563 childHasTransientStateChanged(child, true); 3564 } 3565 } 3566 3567 private void addInArray(View child, int index) { 3568 View[] children = mChildren; 3569 final int count = mChildrenCount; 3570 final int size = children.length; 3571 if (index == count) { 3572 if (size == count) { 3573 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3574 System.arraycopy(children, 0, mChildren, 0, size); 3575 children = mChildren; 3576 } 3577 children[mChildrenCount++] = child; 3578 } else if (index < count) { 3579 if (size == count) { 3580 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3581 System.arraycopy(children, 0, mChildren, 0, index); 3582 System.arraycopy(children, index, mChildren, index + 1, count - index); 3583 children = mChildren; 3584 } else { 3585 System.arraycopy(children, index, children, index + 1, count - index); 3586 } 3587 children[index] = child; 3588 mChildrenCount++; 3589 if (mLastTouchDownIndex >= index) { 3590 mLastTouchDownIndex++; 3591 } 3592 } else { 3593 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3594 } 3595 } 3596 3597 // This method also sets the child's mParent to null 3598 private void removeFromArray(int index) { 3599 final View[] children = mChildren; 3600 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3601 children[index].mParent = null; 3602 } 3603 final int count = mChildrenCount; 3604 if (index == count - 1) { 3605 children[--mChildrenCount] = null; 3606 } else if (index >= 0 && index < count) { 3607 System.arraycopy(children, index + 1, children, index, count - index - 1); 3608 children[--mChildrenCount] = null; 3609 } else { 3610 throw new IndexOutOfBoundsException(); 3611 } 3612 if (mLastTouchDownIndex == index) { 3613 mLastTouchDownTime = 0; 3614 mLastTouchDownIndex = -1; 3615 } else if (mLastTouchDownIndex > index) { 3616 mLastTouchDownIndex--; 3617 } 3618 } 3619 3620 // This method also sets the children's mParent to null 3621 private void removeFromArray(int start, int count) { 3622 final View[] children = mChildren; 3623 final int childrenCount = mChildrenCount; 3624 3625 start = Math.max(0, start); 3626 final int end = Math.min(childrenCount, start + count); 3627 3628 if (start == end) { 3629 return; 3630 } 3631 3632 if (end == childrenCount) { 3633 for (int i = start; i < end; i++) { 3634 children[i].mParent = null; 3635 children[i] = null; 3636 } 3637 } else { 3638 for (int i = start; i < end; i++) { 3639 children[i].mParent = null; 3640 } 3641 3642 // Since we're looping above, we might as well do the copy, but is arraycopy() 3643 // faster than the extra 2 bounds checks we would do in the loop? 3644 System.arraycopy(children, end, children, start, childrenCount - end); 3645 3646 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3647 children[i] = null; 3648 } 3649 } 3650 3651 mChildrenCount -= (end - start); 3652 } 3653 3654 private void bindLayoutAnimation(View child) { 3655 Animation a = mLayoutAnimationController.getAnimationForView(child); 3656 child.setAnimation(a); 3657 } 3658 3659 /** 3660 * Subclasses should override this method to set layout animation 3661 * parameters on the supplied child. 3662 * 3663 * @param child the child to associate with animation parameters 3664 * @param params the child's layout parameters which hold the animation 3665 * parameters 3666 * @param index the index of the child in the view group 3667 * @param count the number of children in the view group 3668 */ 3669 protected void attachLayoutAnimationParameters(View child, 3670 LayoutParams params, int index, int count) { 3671 LayoutAnimationController.AnimationParameters animationParams = 3672 params.layoutAnimationParameters; 3673 if (animationParams == null) { 3674 animationParams = new LayoutAnimationController.AnimationParameters(); 3675 params.layoutAnimationParameters = animationParams; 3676 } 3677 3678 animationParams.count = count; 3679 animationParams.index = index; 3680 } 3681 3682 /** 3683 * {@inheritDoc} 3684 * 3685 * <p><strong>Note:</strong> do not invoke this method from 3686 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3687 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3688 */ 3689 public void removeView(View view) { 3690 removeViewInternal(view); 3691 requestLayout(); 3692 invalidate(true); 3693 } 3694 3695 /** 3696 * Removes a view during layout. This is useful if in your onLayout() method, 3697 * you need to remove more views. 3698 * 3699 * <p><strong>Note:</strong> do not invoke this method from 3700 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3701 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3702 * 3703 * @param view the view to remove from the group 3704 */ 3705 public void removeViewInLayout(View view) { 3706 removeViewInternal(view); 3707 } 3708 3709 /** 3710 * Removes a range of views during layout. This is useful if in your onLayout() method, 3711 * you need to remove more views. 3712 * 3713 * <p><strong>Note:</strong> do not invoke this method from 3714 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3715 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3716 * 3717 * @param start the index of the first view to remove from the group 3718 * @param count the number of views to remove from the group 3719 */ 3720 public void removeViewsInLayout(int start, int count) { 3721 removeViewsInternal(start, count); 3722 } 3723 3724 /** 3725 * Removes the view at the specified position in the group. 3726 * 3727 * <p><strong>Note:</strong> do not invoke this method from 3728 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3729 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3730 * 3731 * @param index the position in the group of the view to remove 3732 */ 3733 public void removeViewAt(int index) { 3734 removeViewInternal(index, getChildAt(index)); 3735 requestLayout(); 3736 invalidate(true); 3737 } 3738 3739 /** 3740 * Removes the specified range of views from the group. 3741 * 3742 * <p><strong>Note:</strong> do not invoke this method from 3743 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3744 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3745 * 3746 * @param start the first position in the group of the range of views to remove 3747 * @param count the number of views to remove 3748 */ 3749 public void removeViews(int start, int count) { 3750 removeViewsInternal(start, count); 3751 requestLayout(); 3752 invalidate(true); 3753 } 3754 3755 private void removeViewInternal(View view) { 3756 final int index = indexOfChild(view); 3757 if (index >= 0) { 3758 removeViewInternal(index, view); 3759 } 3760 } 3761 3762 private void removeViewInternal(int index, View view) { 3763 3764 if (mTransition != null) { 3765 mTransition.removeChild(this, view); 3766 } 3767 3768 boolean clearChildFocus = false; 3769 if (view == mFocused) { 3770 view.unFocus(); 3771 clearChildFocus = true; 3772 } 3773 3774 if (view.isAccessibilityFocused()) { 3775 view.clearAccessibilityFocus(); 3776 } 3777 3778 cancelTouchTarget(view); 3779 cancelHoverTarget(view); 3780 3781 if (view.getAnimation() != null || 3782 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3783 addDisappearingView(view); 3784 } else if (view.mAttachInfo != null) { 3785 view.dispatchDetachedFromWindow(); 3786 } 3787 3788 if (view.hasTransientState()) { 3789 childHasTransientStateChanged(view, false); 3790 } 3791 3792 needGlobalAttributesUpdate(false); 3793 3794 removeFromArray(index); 3795 3796 if (clearChildFocus) { 3797 clearChildFocus(view); 3798 if (!rootViewRequestFocus()) { 3799 notifyGlobalFocusCleared(this); 3800 } 3801 } 3802 3803 onViewRemoved(view); 3804 } 3805 3806 /** 3807 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3808 * not null, changes in layout which occur because of children being added to or removed from 3809 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3810 * object. By default, the transition object is null (so layout changes are not animated). 3811 * 3812 * @param transition The LayoutTransition object that will animated changes in layout. A value 3813 * of <code>null</code> means no transition will run on layout changes. 3814 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3815 */ 3816 public void setLayoutTransition(LayoutTransition transition) { 3817 if (mTransition != null) { 3818 mTransition.removeTransitionListener(mLayoutTransitionListener); 3819 } 3820 mTransition = transition; 3821 if (mTransition != null) { 3822 mTransition.addTransitionListener(mLayoutTransitionListener); 3823 } 3824 } 3825 3826 /** 3827 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3828 * not null, changes in layout which occur because of children being added to or removed from 3829 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3830 * object. By default, the transition object is null (so layout changes are not animated). 3831 * 3832 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3833 * A value of <code>null</code> means no transition will run on layout changes. 3834 */ 3835 public LayoutTransition getLayoutTransition() { 3836 return mTransition; 3837 } 3838 3839 private void removeViewsInternal(int start, int count) { 3840 final View focused = mFocused; 3841 final boolean detach = mAttachInfo != null; 3842 boolean clearChildFocus = false; 3843 3844 final View[] children = mChildren; 3845 final int end = start + count; 3846 3847 for (int i = start; i < end; i++) { 3848 final View view = children[i]; 3849 3850 if (mTransition != null) { 3851 mTransition.removeChild(this, view); 3852 } 3853 3854 if (view == focused) { 3855 view.unFocus(); 3856 clearChildFocus = true; 3857 } 3858 3859 if (view.isAccessibilityFocused()) { 3860 view.clearAccessibilityFocus(); 3861 } 3862 3863 cancelTouchTarget(view); 3864 cancelHoverTarget(view); 3865 3866 if (view.getAnimation() != null || 3867 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3868 addDisappearingView(view); 3869 } else if (detach) { 3870 view.dispatchDetachedFromWindow(); 3871 } 3872 3873 if (view.hasTransientState()) { 3874 childHasTransientStateChanged(view, false); 3875 } 3876 3877 needGlobalAttributesUpdate(false); 3878 3879 onViewRemoved(view); 3880 } 3881 3882 removeFromArray(start, count); 3883 3884 if (clearChildFocus) { 3885 clearChildFocus(focused); 3886 if (!rootViewRequestFocus()) { 3887 notifyGlobalFocusCleared(focused); 3888 } 3889 } 3890 } 3891 3892 /** 3893 * Call this method to remove all child views from the 3894 * ViewGroup. 3895 * 3896 * <p><strong>Note:</strong> do not invoke this method from 3897 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3898 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3899 */ 3900 public void removeAllViews() { 3901 removeAllViewsInLayout(); 3902 requestLayout(); 3903 invalidate(true); 3904 } 3905 3906 /** 3907 * Called by a ViewGroup subclass to remove child views from itself, 3908 * when it must first know its size on screen before it can calculate how many 3909 * child views it will render. An example is a Gallery or a ListView, which 3910 * may "have" 50 children, but actually only render the number of children 3911 * that can currently fit inside the object on screen. Do not call 3912 * this method unless you are extending ViewGroup and understand the 3913 * view measuring and layout pipeline. 3914 * 3915 * <p><strong>Note:</strong> do not invoke this method from 3916 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3917 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3918 */ 3919 public void removeAllViewsInLayout() { 3920 final int count = mChildrenCount; 3921 if (count <= 0) { 3922 return; 3923 } 3924 3925 final View[] children = mChildren; 3926 mChildrenCount = 0; 3927 3928 final View focused = mFocused; 3929 final boolean detach = mAttachInfo != null; 3930 boolean clearChildFocus = false; 3931 3932 needGlobalAttributesUpdate(false); 3933 3934 for (int i = count - 1; i >= 0; i--) { 3935 final View view = children[i]; 3936 3937 if (mTransition != null) { 3938 mTransition.removeChild(this, view); 3939 } 3940 3941 if (view == focused) { 3942 view.unFocus(); 3943 clearChildFocus = true; 3944 } 3945 3946 if (view.isAccessibilityFocused()) { 3947 view.clearAccessibilityFocus(); 3948 } 3949 3950 cancelTouchTarget(view); 3951 cancelHoverTarget(view); 3952 3953 if (view.getAnimation() != null || 3954 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3955 addDisappearingView(view); 3956 } else if (detach) { 3957 view.dispatchDetachedFromWindow(); 3958 } 3959 3960 if (view.hasTransientState()) { 3961 childHasTransientStateChanged(view, false); 3962 } 3963 3964 onViewRemoved(view); 3965 3966 view.mParent = null; 3967 children[i] = null; 3968 } 3969 3970 if (clearChildFocus) { 3971 clearChildFocus(focused); 3972 if (!rootViewRequestFocus()) { 3973 notifyGlobalFocusCleared(focused); 3974 } 3975 } 3976 } 3977 3978 /** 3979 * Finishes the removal of a detached view. This method will dispatch the detached from 3980 * window event and notify the hierarchy change listener. 3981 * <p> 3982 * This method is intended to be lightweight and makes no assumptions about whether the 3983 * parent or child should be redrawn. Proper use of this method will include also making 3984 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3985 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3986 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 3987 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3988 * 3989 * @param child the child to be definitely removed from the view hierarchy 3990 * @param animate if true and the view has an animation, the view is placed in the 3991 * disappearing views list, otherwise, it is detached from the window 3992 * 3993 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3994 * @see #detachAllViewsFromParent() 3995 * @see #detachViewFromParent(View) 3996 * @see #detachViewFromParent(int) 3997 */ 3998 protected void removeDetachedView(View child, boolean animate) { 3999 if (mTransition != null) { 4000 mTransition.removeChild(this, child); 4001 } 4002 4003 if (child == mFocused) { 4004 child.clearFocus(); 4005 } 4006 4007 child.clearAccessibilityFocus(); 4008 4009 cancelTouchTarget(child); 4010 cancelHoverTarget(child); 4011 4012 if ((animate && child.getAnimation() != null) || 4013 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4014 addDisappearingView(child); 4015 } else if (child.mAttachInfo != null) { 4016 child.dispatchDetachedFromWindow(); 4017 } 4018 4019 if (child.hasTransientState()) { 4020 childHasTransientStateChanged(child, false); 4021 } 4022 4023 onViewRemoved(child); 4024 } 4025 4026 /** 4027 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4028 * sets the layout parameters and puts the view in the list of children so that 4029 * it can be retrieved by calling {@link #getChildAt(int)}. 4030 * <p> 4031 * This method is intended to be lightweight and makes no assumptions about whether the 4032 * parent or child should be redrawn. Proper use of this method will include also making 4033 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4034 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4035 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4036 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4037 * <p> 4038 * This method should be called only for views which were detached from their parent. 4039 * 4040 * @param child the child to attach 4041 * @param index the index at which the child should be attached 4042 * @param params the layout parameters of the child 4043 * 4044 * @see #removeDetachedView(View, boolean) 4045 * @see #detachAllViewsFromParent() 4046 * @see #detachViewFromParent(View) 4047 * @see #detachViewFromParent(int) 4048 */ 4049 protected void attachViewToParent(View child, int index, LayoutParams params) { 4050 child.mLayoutParams = params; 4051 4052 if (index < 0) { 4053 index = mChildrenCount; 4054 } 4055 4056 addInArray(child, index); 4057 4058 child.mParent = this; 4059 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4060 & ~PFLAG_DRAWING_CACHE_VALID) 4061 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4062 this.mPrivateFlags |= PFLAG_INVALIDATED; 4063 4064 if (child.hasFocus()) { 4065 requestChildFocus(child, child.findFocus()); 4066 } 4067 } 4068 4069 /** 4070 * Detaches a view from its parent. Detaching a view should be followed 4071 * either by a call to 4072 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4073 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4074 * temporary; reattachment or removal should happen within the same drawing cycle as 4075 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4076 * call to {@link #getChildAt(int)}. 4077 * 4078 * @param child the child to detach 4079 * 4080 * @see #detachViewFromParent(int) 4081 * @see #detachViewsFromParent(int, int) 4082 * @see #detachAllViewsFromParent() 4083 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4084 * @see #removeDetachedView(View, boolean) 4085 */ 4086 protected void detachViewFromParent(View child) { 4087 removeFromArray(indexOfChild(child)); 4088 } 4089 4090 /** 4091 * Detaches a view from its parent. Detaching a view should be followed 4092 * either by a call to 4093 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4094 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4095 * temporary; reattachment or removal should happen within the same drawing cycle as 4096 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4097 * call to {@link #getChildAt(int)}. 4098 * 4099 * @param index the index of the child to detach 4100 * 4101 * @see #detachViewFromParent(View) 4102 * @see #detachAllViewsFromParent() 4103 * @see #detachViewsFromParent(int, int) 4104 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4105 * @see #removeDetachedView(View, boolean) 4106 */ 4107 protected void detachViewFromParent(int index) { 4108 removeFromArray(index); 4109 } 4110 4111 /** 4112 * Detaches a range of views from their parents. Detaching a view should be followed 4113 * either by a call to 4114 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4115 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4116 * temporary; reattachment or removal should happen within the same drawing cycle as 4117 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4118 * call to {@link #getChildAt(int)}. 4119 * 4120 * @param start the first index of the childrend range to detach 4121 * @param count the number of children to detach 4122 * 4123 * @see #detachViewFromParent(View) 4124 * @see #detachViewFromParent(int) 4125 * @see #detachAllViewsFromParent() 4126 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4127 * @see #removeDetachedView(View, boolean) 4128 */ 4129 protected void detachViewsFromParent(int start, int count) { 4130 removeFromArray(start, count); 4131 } 4132 4133 /** 4134 * Detaches all views from the parent. Detaching a view should be followed 4135 * either by a call to 4136 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4137 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4138 * temporary; reattachment or removal should happen within the same drawing cycle as 4139 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4140 * call to {@link #getChildAt(int)}. 4141 * 4142 * @see #detachViewFromParent(View) 4143 * @see #detachViewFromParent(int) 4144 * @see #detachViewsFromParent(int, int) 4145 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4146 * @see #removeDetachedView(View, boolean) 4147 */ 4148 protected void detachAllViewsFromParent() { 4149 final int count = mChildrenCount; 4150 if (count <= 0) { 4151 return; 4152 } 4153 4154 final View[] children = mChildren; 4155 mChildrenCount = 0; 4156 4157 for (int i = count - 1; i >= 0; i--) { 4158 children[i].mParent = null; 4159 children[i] = null; 4160 } 4161 } 4162 4163 /** 4164 * Don't call or override this method. It is used for the implementation of 4165 * the view hierarchy. 4166 */ 4167 public final void invalidateChild(View child, final Rect dirty) { 4168 ViewParent parent = this; 4169 4170 final AttachInfo attachInfo = mAttachInfo; 4171 if (attachInfo != null) { 4172 // If the child is drawing an animation, we want to copy this flag onto 4173 // ourselves and the parent to make sure the invalidate request goes 4174 // through 4175 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4176 == PFLAG_DRAW_ANIMATION; 4177 4178 // Check whether the child that requests the invalidate is fully opaque 4179 // Views being animated or transformed are not considered opaque because we may 4180 // be invalidating their old position and need the parent to paint behind them. 4181 Matrix childMatrix = child.getMatrix(); 4182 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4183 child.getAnimation() == null && childMatrix.isIdentity(); 4184 // Mark the child as dirty, using the appropriate flag 4185 // Make sure we do not set both flags at the same time 4186 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4187 4188 if (child.mLayerType != LAYER_TYPE_NONE) { 4189 mPrivateFlags |= PFLAG_INVALIDATED; 4190 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4191 child.mLocalDirtyRect.union(dirty); 4192 } 4193 4194 final int[] location = attachInfo.mInvalidateChildLocation; 4195 location[CHILD_LEFT_INDEX] = child.mLeft; 4196 location[CHILD_TOP_INDEX] = child.mTop; 4197 if (!childMatrix.isIdentity() || 4198 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4199 RectF boundingRect = attachInfo.mTmpTransformRect; 4200 boundingRect.set(dirty); 4201 Matrix transformMatrix; 4202 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4203 Transformation t = attachInfo.mTmpTransformation; 4204 boolean transformed = getChildStaticTransformation(child, t); 4205 if (transformed) { 4206 transformMatrix = attachInfo.mTmpMatrix; 4207 transformMatrix.set(t.getMatrix()); 4208 if (!childMatrix.isIdentity()) { 4209 transformMatrix.preConcat(childMatrix); 4210 } 4211 } else { 4212 transformMatrix = childMatrix; 4213 } 4214 } else { 4215 transformMatrix = childMatrix; 4216 } 4217 transformMatrix.mapRect(boundingRect); 4218 dirty.set((int) (boundingRect.left - 0.5f), 4219 (int) (boundingRect.top - 0.5f), 4220 (int) (boundingRect.right + 0.5f), 4221 (int) (boundingRect.bottom + 0.5f)); 4222 } 4223 4224 do { 4225 View view = null; 4226 if (parent instanceof View) { 4227 view = (View) parent; 4228 } 4229 4230 if (drawAnimation) { 4231 if (view != null) { 4232 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4233 } else if (parent instanceof ViewRootImpl) { 4234 ((ViewRootImpl) parent).mIsAnimating = true; 4235 } 4236 } 4237 4238 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4239 // flag coming from the child that initiated the invalidate 4240 if (view != null) { 4241 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4242 view.getSolidColor() == 0) { 4243 opaqueFlag = PFLAG_DIRTY; 4244 } 4245 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4246 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4247 } 4248 } 4249 4250 parent = parent.invalidateChildInParent(location, dirty); 4251 if (view != null) { 4252 // Account for transform on current parent 4253 Matrix m = view.getMatrix(); 4254 if (!m.isIdentity()) { 4255 RectF boundingRect = attachInfo.mTmpTransformRect; 4256 boundingRect.set(dirty); 4257 m.mapRect(boundingRect); 4258 dirty.set((int) (boundingRect.left - 0.5f), 4259 (int) (boundingRect.top - 0.5f), 4260 (int) (boundingRect.right + 0.5f), 4261 (int) (boundingRect.bottom + 0.5f)); 4262 } 4263 } 4264 } while (parent != null); 4265 } 4266 } 4267 4268 /** 4269 * Don't call or override this method. It is used for the implementation of 4270 * the view hierarchy. 4271 * 4272 * This implementation returns null if this ViewGroup does not have a parent, 4273 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4274 * does not intersect with this ViewGroup's bounds. 4275 */ 4276 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4277 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4278 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4279 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4280 FLAG_OPTIMIZE_INVALIDATE) { 4281 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4282 location[CHILD_TOP_INDEX] - mScrollY); 4283 4284 final int left = mLeft; 4285 final int top = mTop; 4286 4287 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4288 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4289 dirty.setEmpty(); 4290 } 4291 } 4292 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4293 4294 location[CHILD_LEFT_INDEX] = left; 4295 location[CHILD_TOP_INDEX] = top; 4296 4297 if (mLayerType != LAYER_TYPE_NONE) { 4298 mPrivateFlags |= PFLAG_INVALIDATED; 4299 mLocalDirtyRect.union(dirty); 4300 } 4301 4302 return mParent; 4303 4304 } else { 4305 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4306 4307 location[CHILD_LEFT_INDEX] = mLeft; 4308 location[CHILD_TOP_INDEX] = mTop; 4309 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4310 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4311 } else { 4312 // in case the dirty rect extends outside the bounds of this container 4313 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4314 } 4315 4316 if (mLayerType != LAYER_TYPE_NONE) { 4317 mPrivateFlags |= PFLAG_INVALIDATED; 4318 mLocalDirtyRect.union(dirty); 4319 } 4320 4321 return mParent; 4322 } 4323 } 4324 4325 return null; 4326 } 4327 4328 /** 4329 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4330 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4331 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4332 * 4333 * @hide 4334 */ 4335 public void invalidateChildFast(View child, final Rect dirty) { 4336 ViewParent parent = this; 4337 4338 final AttachInfo attachInfo = mAttachInfo; 4339 if (attachInfo != null) { 4340 if (child.mLayerType != LAYER_TYPE_NONE) { 4341 child.mLocalDirtyRect.union(dirty); 4342 } 4343 4344 int left = child.mLeft; 4345 int top = child.mTop; 4346 if (!child.getMatrix().isIdentity()) { 4347 child.transformRect(dirty); 4348 } 4349 4350 do { 4351 if (parent instanceof ViewGroup) { 4352 ViewGroup parentVG = (ViewGroup) parent; 4353 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4354 // Layered parents should be recreated, not just re-issued 4355 parentVG.invalidate(); 4356 parent = null; 4357 } else { 4358 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4359 left = parentVG.mLeft; 4360 top = parentVG.mTop; 4361 } 4362 } else { 4363 // Reached the top; this calls into the usual invalidate method in 4364 // ViewRootImpl, which schedules a traversal 4365 final int[] location = attachInfo.mInvalidateChildLocation; 4366 location[0] = left; 4367 location[1] = top; 4368 parent = parent.invalidateChildInParent(location, dirty); 4369 } 4370 } while (parent != null); 4371 } 4372 } 4373 4374 /** 4375 * Quick invalidation method that simply transforms the dirty rect into the parent's 4376 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4377 */ 4378 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4379 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4380 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4381 dirty.offset(left - mScrollX, top - mScrollY); 4382 4383 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4384 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4385 4386 if (mLayerType != LAYER_TYPE_NONE) { 4387 mLocalDirtyRect.union(dirty); 4388 } 4389 if (!getMatrix().isIdentity()) { 4390 transformRect(dirty); 4391 } 4392 4393 return mParent; 4394 } 4395 } 4396 4397 return null; 4398 } 4399 4400 /** 4401 * Offset a rectangle that is in a descendant's coordinate 4402 * space into our coordinate space. 4403 * @param descendant A descendant of this view 4404 * @param rect A rectangle defined in descendant's coordinate space. 4405 */ 4406 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4407 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4408 } 4409 4410 /** 4411 * Offset a rectangle that is in our coordinate space into an ancestor's 4412 * coordinate space. 4413 * @param descendant A descendant of this view 4414 * @param rect A rectangle defined in descendant's coordinate space. 4415 */ 4416 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4417 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4418 } 4419 4420 /** 4421 * Helper method that offsets a rect either from parent to descendant or 4422 * descendant to parent. 4423 */ 4424 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4425 boolean offsetFromChildToParent, boolean clipToBounds) { 4426 4427 // already in the same coord system :) 4428 if (descendant == this) { 4429 return; 4430 } 4431 4432 ViewParent theParent = descendant.mParent; 4433 4434 // search and offset up to the parent 4435 while ((theParent != null) 4436 && (theParent instanceof View) 4437 && (theParent != this)) { 4438 4439 if (offsetFromChildToParent) { 4440 rect.offset(descendant.mLeft - descendant.mScrollX, 4441 descendant.mTop - descendant.mScrollY); 4442 if (clipToBounds) { 4443 View p = (View) theParent; 4444 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4445 } 4446 } else { 4447 if (clipToBounds) { 4448 View p = (View) theParent; 4449 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4450 } 4451 rect.offset(descendant.mScrollX - descendant.mLeft, 4452 descendant.mScrollY - descendant.mTop); 4453 } 4454 4455 descendant = (View) theParent; 4456 theParent = descendant.mParent; 4457 } 4458 4459 // now that we are up to this view, need to offset one more time 4460 // to get into our coordinate space 4461 if (theParent == this) { 4462 if (offsetFromChildToParent) { 4463 rect.offset(descendant.mLeft - descendant.mScrollX, 4464 descendant.mTop - descendant.mScrollY); 4465 } else { 4466 rect.offset(descendant.mScrollX - descendant.mLeft, 4467 descendant.mScrollY - descendant.mTop); 4468 } 4469 } else { 4470 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4471 } 4472 } 4473 4474 /** 4475 * Offset the vertical location of all children of this view by the specified number of pixels. 4476 * 4477 * @param offset the number of pixels to offset 4478 * 4479 * @hide 4480 */ 4481 public void offsetChildrenTopAndBottom(int offset) { 4482 final int count = mChildrenCount; 4483 final View[] children = mChildren; 4484 4485 for (int i = 0; i < count; i++) { 4486 final View v = children[i]; 4487 v.mTop += offset; 4488 v.mBottom += offset; 4489 if (v.mDisplayList != null) { 4490 v.mDisplayList.offsetTopAndBottom(offset); 4491 invalidateViewProperty(false, false); 4492 } 4493 } 4494 } 4495 4496 /** 4497 * {@inheritDoc} 4498 */ 4499 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4500 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4501 // but for some simple tests it can be useful. If we don't have attach info this 4502 // will allocate memory. 4503 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4504 rect.set(r); 4505 4506 if (!child.hasIdentityMatrix()) { 4507 child.getMatrix().mapRect(rect); 4508 } 4509 4510 int dx = child.mLeft - mScrollX; 4511 int dy = child.mTop - mScrollY; 4512 4513 rect.offset(dx, dy); 4514 4515 if (offset != null) { 4516 if (!child.hasIdentityMatrix()) { 4517 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4518 : new float[2]; 4519 position[0] = offset.x; 4520 position[1] = offset.y; 4521 child.getMatrix().mapPoints(position); 4522 offset.x = (int) (position[0] + 0.5f); 4523 offset.y = (int) (position[1] + 0.5f); 4524 } 4525 offset.x += dx; 4526 offset.y += dy; 4527 } 4528 4529 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4530 if (mParent == null) return true; 4531 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4532 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4533 return mParent.getChildVisibleRect(this, r, offset); 4534 } 4535 4536 return false; 4537 } 4538 4539 /** 4540 * {@inheritDoc} 4541 */ 4542 @Override 4543 public final void layout(int l, int t, int r, int b) { 4544 if (mTransition == null || !mTransition.isChangingLayout()) { 4545 if (mTransition != null) { 4546 mTransition.layoutChange(this); 4547 } 4548 super.layout(l, t, r, b); 4549 } else { 4550 // record the fact that we noop'd it; request layout when transition finishes 4551 mLayoutSuppressed = true; 4552 } 4553 } 4554 4555 /** 4556 * {@inheritDoc} 4557 */ 4558 @Override 4559 protected abstract void onLayout(boolean changed, 4560 int l, int t, int r, int b); 4561 4562 /** 4563 * Indicates whether the view group has the ability to animate its children 4564 * after the first layout. 4565 * 4566 * @return true if the children can be animated, false otherwise 4567 */ 4568 protected boolean canAnimate() { 4569 return mLayoutAnimationController != null; 4570 } 4571 4572 /** 4573 * Runs the layout animation. Calling this method triggers a relayout of 4574 * this view group. 4575 */ 4576 public void startLayoutAnimation() { 4577 if (mLayoutAnimationController != null) { 4578 mGroupFlags |= FLAG_RUN_ANIMATION; 4579 requestLayout(); 4580 } 4581 } 4582 4583 /** 4584 * Schedules the layout animation to be played after the next layout pass 4585 * of this view group. This can be used to restart the layout animation 4586 * when the content of the view group changes or when the activity is 4587 * paused and resumed. 4588 */ 4589 public void scheduleLayoutAnimation() { 4590 mGroupFlags |= FLAG_RUN_ANIMATION; 4591 } 4592 4593 /** 4594 * Sets the layout animation controller used to animate the group's 4595 * children after the first layout. 4596 * 4597 * @param controller the animation controller 4598 */ 4599 public void setLayoutAnimation(LayoutAnimationController controller) { 4600 mLayoutAnimationController = controller; 4601 if (mLayoutAnimationController != null) { 4602 mGroupFlags |= FLAG_RUN_ANIMATION; 4603 } 4604 } 4605 4606 /** 4607 * Returns the layout animation controller used to animate the group's 4608 * children. 4609 * 4610 * @return the current animation controller 4611 */ 4612 public LayoutAnimationController getLayoutAnimation() { 4613 return mLayoutAnimationController; 4614 } 4615 4616 /** 4617 * Indicates whether the children's drawing cache is used during a layout 4618 * animation. By default, the drawing cache is enabled but this will prevent 4619 * nested layout animations from working. To nest animations, you must disable 4620 * the cache. 4621 * 4622 * @return true if the animation cache is enabled, false otherwise 4623 * 4624 * @see #setAnimationCacheEnabled(boolean) 4625 * @see View#setDrawingCacheEnabled(boolean) 4626 */ 4627 @ViewDebug.ExportedProperty 4628 public boolean isAnimationCacheEnabled() { 4629 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4630 } 4631 4632 /** 4633 * Enables or disables the children's drawing cache during a layout animation. 4634 * By default, the drawing cache is enabled but this will prevent nested 4635 * layout animations from working. To nest animations, you must disable the 4636 * cache. 4637 * 4638 * @param enabled true to enable the animation cache, false otherwise 4639 * 4640 * @see #isAnimationCacheEnabled() 4641 * @see View#setDrawingCacheEnabled(boolean) 4642 */ 4643 public void setAnimationCacheEnabled(boolean enabled) { 4644 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4645 } 4646 4647 /** 4648 * Indicates whether this ViewGroup will always try to draw its children using their 4649 * drawing cache. By default this property is enabled. 4650 * 4651 * @return true if the animation cache is enabled, false otherwise 4652 * 4653 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4654 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4655 * @see View#setDrawingCacheEnabled(boolean) 4656 */ 4657 @ViewDebug.ExportedProperty(category = "drawing") 4658 public boolean isAlwaysDrawnWithCacheEnabled() { 4659 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4660 } 4661 4662 /** 4663 * Indicates whether this ViewGroup will always try to draw its children using their 4664 * drawing cache. This property can be set to true when the cache rendering is 4665 * slightly different from the children's normal rendering. Renderings can be different, 4666 * for instance, when the cache's quality is set to low. 4667 * 4668 * When this property is disabled, the ViewGroup will use the drawing cache of its 4669 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4670 * when to start using the drawing cache and when to stop using it. 4671 * 4672 * @param always true to always draw with the drawing cache, false otherwise 4673 * 4674 * @see #isAlwaysDrawnWithCacheEnabled() 4675 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4676 * @see View#setDrawingCacheEnabled(boolean) 4677 * @see View#setDrawingCacheQuality(int) 4678 */ 4679 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4680 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4681 } 4682 4683 /** 4684 * Indicates whether the ViewGroup is currently drawing its children using 4685 * their drawing cache. 4686 * 4687 * @return true if children should be drawn with their cache, false otherwise 4688 * 4689 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4690 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4691 */ 4692 @ViewDebug.ExportedProperty(category = "drawing") 4693 protected boolean isChildrenDrawnWithCacheEnabled() { 4694 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4695 } 4696 4697 /** 4698 * Tells the ViewGroup to draw its children using their drawing cache. This property 4699 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4700 * will be used only if it has been enabled. 4701 * 4702 * Subclasses should call this method to start and stop using the drawing cache when 4703 * they perform performance sensitive operations, like scrolling or animating. 4704 * 4705 * @param enabled true if children should be drawn with their cache, false otherwise 4706 * 4707 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4708 * @see #isChildrenDrawnWithCacheEnabled() 4709 */ 4710 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4711 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4712 } 4713 4714 /** 4715 * Indicates whether the ViewGroup is drawing its children in the order defined by 4716 * {@link #getChildDrawingOrder(int, int)}. 4717 * 4718 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4719 * false otherwise 4720 * 4721 * @see #setChildrenDrawingOrderEnabled(boolean) 4722 * @see #getChildDrawingOrder(int, int) 4723 */ 4724 @ViewDebug.ExportedProperty(category = "drawing") 4725 protected boolean isChildrenDrawingOrderEnabled() { 4726 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4727 } 4728 4729 /** 4730 * Tells the ViewGroup whether to draw its children in the order defined by the method 4731 * {@link #getChildDrawingOrder(int, int)}. 4732 * 4733 * @param enabled true if the order of the children when drawing is determined by 4734 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4735 * 4736 * @see #isChildrenDrawingOrderEnabled() 4737 * @see #getChildDrawingOrder(int, int) 4738 */ 4739 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4740 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4741 } 4742 4743 private boolean getBooleanFlag(int flag) { 4744 return (mGroupFlags & flag) == flag; 4745 } 4746 4747 private void setBooleanFlag(int flag, boolean value) { 4748 if (value) { 4749 mGroupFlags |= flag; 4750 } else { 4751 mGroupFlags &= ~flag; 4752 } 4753 } 4754 4755 /** 4756 * Returns an integer indicating what types of drawing caches are kept in memory. 4757 * 4758 * @see #setPersistentDrawingCache(int) 4759 * @see #setAnimationCacheEnabled(boolean) 4760 * 4761 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4762 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4763 * and {@link #PERSISTENT_ALL_CACHES} 4764 */ 4765 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4766 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4767 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4768 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4769 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4770 }) 4771 public int getPersistentDrawingCache() { 4772 return mPersistentDrawingCache; 4773 } 4774 4775 /** 4776 * Indicates what types of drawing caches should be kept in memory after 4777 * they have been created. 4778 * 4779 * @see #getPersistentDrawingCache() 4780 * @see #setAnimationCacheEnabled(boolean) 4781 * 4782 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4783 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4784 * and {@link #PERSISTENT_ALL_CACHES} 4785 */ 4786 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4787 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4788 } 4789 4790 private void setLayoutMode(int layoutMode, boolean explicitly) { 4791 mLayoutMode = layoutMode; 4792 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4793 } 4794 4795 /** 4796 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4797 * descendants that had inherited a different layoutMode from a previous parent. 4798 * Recursion terminates when a descendant's mode is: 4799 * <ul> 4800 * <li>Undefined</li> 4801 * <li>The same as the root node's</li> 4802 * <li>A mode that had been explicitly set</li> 4803 * <ul/> 4804 * The first two clauses are optimizations. 4805 * @param layoutModeOfRoot 4806 */ 4807 @Override 4808 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4809 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4810 mLayoutMode == layoutModeOfRoot || 4811 getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4812 return; 4813 } 4814 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4815 4816 // apply recursively 4817 for (int i = 0, N = getChildCount(); i < N; i++) { 4818 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4819 } 4820 } 4821 4822 /** 4823 * Returns the basis of alignment during layout operations on this ViewGroup: 4824 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4825 * <p> 4826 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4827 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4828 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4829 * 4830 * @return the layout mode to use during layout operations 4831 * 4832 * @see #setLayoutMode(int) 4833 */ 4834 public int getLayoutMode() { 4835 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4836 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4837 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4838 setLayoutMode(inheritedLayoutMode, false); 4839 } 4840 return mLayoutMode; 4841 } 4842 4843 /** 4844 * Sets the basis of alignment during the layout of this ViewGroup. 4845 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4846 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4847 * 4848 * @param layoutMode the layout mode to use during layout operations 4849 * 4850 * @see #getLayoutMode() 4851 */ 4852 public void setLayoutMode(int layoutMode) { 4853 if (mLayoutMode != layoutMode) { 4854 invalidateInheritedLayoutMode(layoutMode); 4855 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4856 requestLayout(); 4857 } 4858 } 4859 4860 /** 4861 * Returns a new set of layout parameters based on the supplied attributes set. 4862 * 4863 * @param attrs the attributes to build the layout parameters from 4864 * 4865 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4866 * of its descendants 4867 */ 4868 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4869 return new LayoutParams(getContext(), attrs); 4870 } 4871 4872 /** 4873 * Returns a safe set of layout parameters based on the supplied layout params. 4874 * When a ViewGroup is passed a View whose layout params do not pass the test of 4875 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4876 * is invoked. This method should return a new set of layout params suitable for 4877 * this ViewGroup, possibly by copying the appropriate attributes from the 4878 * specified set of layout params. 4879 * 4880 * @param p The layout parameters to convert into a suitable set of layout parameters 4881 * for this ViewGroup. 4882 * 4883 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4884 * of its descendants 4885 */ 4886 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4887 return p; 4888 } 4889 4890 /** 4891 * Returns a set of default layout parameters. These parameters are requested 4892 * when the View passed to {@link #addView(View)} has no layout parameters 4893 * already set. If null is returned, an exception is thrown from addView. 4894 * 4895 * @return a set of default layout parameters or null 4896 */ 4897 protected LayoutParams generateDefaultLayoutParams() { 4898 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4899 } 4900 4901 /** 4902 * {@inheritDoc} 4903 */ 4904 @Override 4905 protected void debug(int depth) { 4906 super.debug(depth); 4907 String output; 4908 4909 if (mFocused != null) { 4910 output = debugIndent(depth); 4911 output += "mFocused"; 4912 Log.d(VIEW_LOG_TAG, output); 4913 } 4914 if (mChildrenCount != 0) { 4915 output = debugIndent(depth); 4916 output += "{"; 4917 Log.d(VIEW_LOG_TAG, output); 4918 } 4919 int count = mChildrenCount; 4920 for (int i = 0; i < count; i++) { 4921 View child = mChildren[i]; 4922 child.debug(depth + 1); 4923 } 4924 4925 if (mChildrenCount != 0) { 4926 output = debugIndent(depth); 4927 output += "}"; 4928 Log.d(VIEW_LOG_TAG, output); 4929 } 4930 } 4931 4932 /** 4933 * Returns the position in the group of the specified child view. 4934 * 4935 * @param child the view for which to get the position 4936 * @return a positive integer representing the position of the view in the 4937 * group, or -1 if the view does not exist in the group 4938 */ 4939 public int indexOfChild(View child) { 4940 final int count = mChildrenCount; 4941 final View[] children = mChildren; 4942 for (int i = 0; i < count; i++) { 4943 if (children[i] == child) { 4944 return i; 4945 } 4946 } 4947 return -1; 4948 } 4949 4950 /** 4951 * Returns the number of children in the group. 4952 * 4953 * @return a positive integer representing the number of children in 4954 * the group 4955 */ 4956 public int getChildCount() { 4957 return mChildrenCount; 4958 } 4959 4960 /** 4961 * Returns the view at the specified position in the group. 4962 * 4963 * @param index the position at which to get the view from 4964 * @return the view at the specified position or null if the position 4965 * does not exist within the group 4966 */ 4967 public View getChildAt(int index) { 4968 if (index < 0 || index >= mChildrenCount) { 4969 return null; 4970 } 4971 return mChildren[index]; 4972 } 4973 4974 /** 4975 * Ask all of the children of this view to measure themselves, taking into 4976 * account both the MeasureSpec requirements for this view and its padding. 4977 * We skip children that are in the GONE state The heavy lifting is done in 4978 * getChildMeasureSpec. 4979 * 4980 * @param widthMeasureSpec The width requirements for this view 4981 * @param heightMeasureSpec The height requirements for this view 4982 */ 4983 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4984 final int size = mChildrenCount; 4985 final View[] children = mChildren; 4986 for (int i = 0; i < size; ++i) { 4987 final View child = children[i]; 4988 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4989 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4990 } 4991 } 4992 } 4993 4994 /** 4995 * Ask one of the children of this view to measure itself, taking into 4996 * account both the MeasureSpec requirements for this view and its padding. 4997 * The heavy lifting is done in getChildMeasureSpec. 4998 * 4999 * @param child The child to measure 5000 * @param parentWidthMeasureSpec The width requirements for this view 5001 * @param parentHeightMeasureSpec The height requirements for this view 5002 */ 5003 protected void measureChild(View child, int parentWidthMeasureSpec, 5004 int parentHeightMeasureSpec) { 5005 final LayoutParams lp = child.getLayoutParams(); 5006 5007 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5008 mPaddingLeft + mPaddingRight, lp.width); 5009 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5010 mPaddingTop + mPaddingBottom, lp.height); 5011 5012 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5013 } 5014 5015 /** 5016 * Ask one of the children of this view to measure itself, taking into 5017 * account both the MeasureSpec requirements for this view and its padding 5018 * and margins. The child must have MarginLayoutParams The heavy lifting is 5019 * done in getChildMeasureSpec. 5020 * 5021 * @param child The child to measure 5022 * @param parentWidthMeasureSpec The width requirements for this view 5023 * @param widthUsed Extra space that has been used up by the parent 5024 * horizontally (possibly by other children of the parent) 5025 * @param parentHeightMeasureSpec The height requirements for this view 5026 * @param heightUsed Extra space that has been used up by the parent 5027 * vertically (possibly by other children of the parent) 5028 */ 5029 protected void measureChildWithMargins(View child, 5030 int parentWidthMeasureSpec, int widthUsed, 5031 int parentHeightMeasureSpec, int heightUsed) { 5032 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5033 5034 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5035 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5036 + widthUsed, lp.width); 5037 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5038 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5039 + heightUsed, lp.height); 5040 5041 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5042 } 5043 5044 /** 5045 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5046 * pass to a particular child. This method figures out the right MeasureSpec 5047 * for one dimension (height or width) of one child view. 5048 * 5049 * The goal is to combine information from our MeasureSpec with the 5050 * LayoutParams of the child to get the best possible results. For example, 5051 * if the this view knows its size (because its MeasureSpec has a mode of 5052 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5053 * to be the same size as the parent, the parent should ask the child to 5054 * layout given an exact size. 5055 * 5056 * @param spec The requirements for this view 5057 * @param padding The padding of this view for the current dimension and 5058 * margins, if applicable 5059 * @param childDimension How big the child wants to be in the current 5060 * dimension 5061 * @return a MeasureSpec integer for the child 5062 */ 5063 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5064 int specMode = MeasureSpec.getMode(spec); 5065 int specSize = MeasureSpec.getSize(spec); 5066 5067 int size = Math.max(0, specSize - padding); 5068 5069 int resultSize = 0; 5070 int resultMode = 0; 5071 5072 switch (specMode) { 5073 // Parent has imposed an exact size on us 5074 case MeasureSpec.EXACTLY: 5075 if (childDimension >= 0) { 5076 resultSize = childDimension; 5077 resultMode = MeasureSpec.EXACTLY; 5078 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5079 // Child wants to be our size. So be it. 5080 resultSize = size; 5081 resultMode = MeasureSpec.EXACTLY; 5082 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5083 // Child wants to determine its own size. It can't be 5084 // bigger than us. 5085 resultSize = size; 5086 resultMode = MeasureSpec.AT_MOST; 5087 } 5088 break; 5089 5090 // Parent has imposed a maximum size on us 5091 case MeasureSpec.AT_MOST: 5092 if (childDimension >= 0) { 5093 // Child wants a specific size... so be it 5094 resultSize = childDimension; 5095 resultMode = MeasureSpec.EXACTLY; 5096 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5097 // Child wants to be our size, but our size is not fixed. 5098 // Constrain child to not be bigger than us. 5099 resultSize = size; 5100 resultMode = MeasureSpec.AT_MOST; 5101 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5102 // Child wants to determine its own size. It can't be 5103 // bigger than us. 5104 resultSize = size; 5105 resultMode = MeasureSpec.AT_MOST; 5106 } 5107 break; 5108 5109 // Parent asked to see how big we want to be 5110 case MeasureSpec.UNSPECIFIED: 5111 if (childDimension >= 0) { 5112 // Child wants a specific size... let him have it 5113 resultSize = childDimension; 5114 resultMode = MeasureSpec.EXACTLY; 5115 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5116 // Child wants to be our size... find out how big it should 5117 // be 5118 resultSize = 0; 5119 resultMode = MeasureSpec.UNSPECIFIED; 5120 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5121 // Child wants to determine its own size.... find out how 5122 // big it should be 5123 resultSize = 0; 5124 resultMode = MeasureSpec.UNSPECIFIED; 5125 } 5126 break; 5127 } 5128 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5129 } 5130 5131 5132 /** 5133 * Removes any pending animations for views that have been removed. Call 5134 * this if you don't want animations for exiting views to stack up. 5135 */ 5136 public void clearDisappearingChildren() { 5137 if (mDisappearingChildren != null) { 5138 mDisappearingChildren.clear(); 5139 invalidate(); 5140 } 5141 } 5142 5143 /** 5144 * Add a view which is removed from mChildren but still needs animation 5145 * 5146 * @param v View to add 5147 */ 5148 private void addDisappearingView(View v) { 5149 ArrayList<View> disappearingChildren = mDisappearingChildren; 5150 5151 if (disappearingChildren == null) { 5152 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5153 } 5154 5155 disappearingChildren.add(v); 5156 } 5157 5158 /** 5159 * Cleanup a view when its animation is done. This may mean removing it from 5160 * the list of disappearing views. 5161 * 5162 * @param view The view whose animation has finished 5163 * @param animation The animation, cannot be null 5164 */ 5165 void finishAnimatingView(final View view, Animation animation) { 5166 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5167 if (disappearingChildren != null) { 5168 if (disappearingChildren.contains(view)) { 5169 disappearingChildren.remove(view); 5170 5171 if (view.mAttachInfo != null) { 5172 view.dispatchDetachedFromWindow(); 5173 } 5174 5175 view.clearAnimation(); 5176 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5177 } 5178 } 5179 5180 if (animation != null && !animation.getFillAfter()) { 5181 view.clearAnimation(); 5182 } 5183 5184 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5185 view.onAnimationEnd(); 5186 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5187 // so we'd rather be safe than sorry 5188 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5189 // Draw one more frame after the animation is done 5190 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5191 } 5192 } 5193 5194 /** 5195 * Utility function called by View during invalidation to determine whether a view that 5196 * is invisible or gone should still be invalidated because it is being transitioned (and 5197 * therefore still needs to be drawn). 5198 */ 5199 boolean isViewTransitioning(View view) { 5200 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5201 } 5202 5203 /** 5204 * This method tells the ViewGroup that the given View object, which should have this 5205 * ViewGroup as its parent, 5206 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5207 * is removed from its parent. This allows animations, such as those used by 5208 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5209 * the removal of views. A call to this method should always be accompanied by a later call 5210 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5211 * so that the View finally gets removed. 5212 * 5213 * @param view The View object to be kept visible even if it gets removed from its parent. 5214 */ 5215 public void startViewTransition(View view) { 5216 if (view.mParent == this) { 5217 if (mTransitioningViews == null) { 5218 mTransitioningViews = new ArrayList<View>(); 5219 } 5220 mTransitioningViews.add(view); 5221 } 5222 } 5223 5224 /** 5225 * This method should always be called following an earlier call to 5226 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5227 * and will no longer be displayed. Note that this method does not perform the functionality 5228 * of removing a view from its parent; it just discontinues the display of a View that 5229 * has previously been removed. 5230 * 5231 * @return view The View object that has been removed but is being kept around in the visible 5232 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5233 */ 5234 public void endViewTransition(View view) { 5235 if (mTransitioningViews != null) { 5236 mTransitioningViews.remove(view); 5237 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5238 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5239 disappearingChildren.remove(view); 5240 if (mVisibilityChangingChildren != null && 5241 mVisibilityChangingChildren.contains(view)) { 5242 mVisibilityChangingChildren.remove(view); 5243 } else { 5244 if (view.mAttachInfo != null) { 5245 view.dispatchDetachedFromWindow(); 5246 } 5247 if (view.mParent != null) { 5248 view.mParent = null; 5249 } 5250 } 5251 invalidate(); 5252 } 5253 } 5254 } 5255 5256 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5257 new LayoutTransition.TransitionListener() { 5258 @Override 5259 public void startTransition(LayoutTransition transition, ViewGroup container, 5260 View view, int transitionType) { 5261 // We only care about disappearing items, since we need special logic to keep 5262 // those items visible after they've been 'removed' 5263 if (transitionType == LayoutTransition.DISAPPEARING) { 5264 startViewTransition(view); 5265 } 5266 } 5267 5268 @Override 5269 public void endTransition(LayoutTransition transition, ViewGroup container, 5270 View view, int transitionType) { 5271 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5272 requestLayout(); 5273 mLayoutSuppressed = false; 5274 } 5275 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5276 endViewTransition(view); 5277 } 5278 } 5279 }; 5280 5281 /** 5282 * {@inheritDoc} 5283 */ 5284 @Override 5285 public boolean gatherTransparentRegion(Region region) { 5286 // If no transparent regions requested, we are always opaque. 5287 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5288 if (meOpaque && region == null) { 5289 // The caller doesn't care about the region, so stop now. 5290 return true; 5291 } 5292 super.gatherTransparentRegion(region); 5293 final View[] children = mChildren; 5294 final int count = mChildrenCount; 5295 boolean noneOfTheChildrenAreTransparent = true; 5296 for (int i = 0; i < count; i++) { 5297 final View child = children[i]; 5298 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5299 if (!child.gatherTransparentRegion(region)) { 5300 noneOfTheChildrenAreTransparent = false; 5301 } 5302 } 5303 } 5304 return meOpaque || noneOfTheChildrenAreTransparent; 5305 } 5306 5307 /** 5308 * {@inheritDoc} 5309 */ 5310 public void requestTransparentRegion(View child) { 5311 if (child != null) { 5312 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5313 if (mParent != null) { 5314 mParent.requestTransparentRegion(this); 5315 } 5316 } 5317 } 5318 5319 5320 @Override 5321 protected boolean fitSystemWindows(Rect insets) { 5322 boolean done = super.fitSystemWindows(insets); 5323 if (!done) { 5324 final int count = mChildrenCount; 5325 final View[] children = mChildren; 5326 for (int i = 0; i < count; i++) { 5327 done = children[i].fitSystemWindows(insets); 5328 if (done) { 5329 break; 5330 } 5331 } 5332 } 5333 return done; 5334 } 5335 5336 /** 5337 * Returns the animation listener to which layout animation events are 5338 * sent. 5339 * 5340 * @return an {@link android.view.animation.Animation.AnimationListener} 5341 */ 5342 public Animation.AnimationListener getLayoutAnimationListener() { 5343 return mAnimationListener; 5344 } 5345 5346 @Override 5347 protected void drawableStateChanged() { 5348 super.drawableStateChanged(); 5349 5350 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5351 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5352 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5353 + " child has duplicateParentState set to true"); 5354 } 5355 5356 final View[] children = mChildren; 5357 final int count = mChildrenCount; 5358 5359 for (int i = 0; i < count; i++) { 5360 final View child = children[i]; 5361 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5362 child.refreshDrawableState(); 5363 } 5364 } 5365 } 5366 } 5367 5368 @Override 5369 public void jumpDrawablesToCurrentState() { 5370 super.jumpDrawablesToCurrentState(); 5371 final View[] children = mChildren; 5372 final int count = mChildrenCount; 5373 for (int i = 0; i < count; i++) { 5374 children[i].jumpDrawablesToCurrentState(); 5375 } 5376 } 5377 5378 @Override 5379 protected int[] onCreateDrawableState(int extraSpace) { 5380 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5381 return super.onCreateDrawableState(extraSpace); 5382 } 5383 5384 int need = 0; 5385 int n = getChildCount(); 5386 for (int i = 0; i < n; i++) { 5387 int[] childState = getChildAt(i).getDrawableState(); 5388 5389 if (childState != null) { 5390 need += childState.length; 5391 } 5392 } 5393 5394 int[] state = super.onCreateDrawableState(extraSpace + need); 5395 5396 for (int i = 0; i < n; i++) { 5397 int[] childState = getChildAt(i).getDrawableState(); 5398 5399 if (childState != null) { 5400 state = mergeDrawableStates(state, childState); 5401 } 5402 } 5403 5404 return state; 5405 } 5406 5407 /** 5408 * Sets whether this ViewGroup's drawable states also include 5409 * its children's drawable states. This is used, for example, to 5410 * make a group appear to be focused when its child EditText or button 5411 * is focused. 5412 */ 5413 public void setAddStatesFromChildren(boolean addsStates) { 5414 if (addsStates) { 5415 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5416 } else { 5417 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5418 } 5419 5420 refreshDrawableState(); 5421 } 5422 5423 /** 5424 * Returns whether this ViewGroup's drawable states also include 5425 * its children's drawable states. This is used, for example, to 5426 * make a group appear to be focused when its child EditText or button 5427 * is focused. 5428 */ 5429 public boolean addStatesFromChildren() { 5430 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5431 } 5432 5433 /** 5434 * If {@link #addStatesFromChildren} is true, refreshes this group's 5435 * drawable state (to include the states from its children). 5436 */ 5437 public void childDrawableStateChanged(View child) { 5438 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5439 refreshDrawableState(); 5440 } 5441 } 5442 5443 /** 5444 * Specifies the animation listener to which layout animation events must 5445 * be sent. Only 5446 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5447 * and 5448 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5449 * are invoked. 5450 * 5451 * @param animationListener the layout animation listener 5452 */ 5453 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5454 mAnimationListener = animationListener; 5455 } 5456 5457 /** 5458 * This method is called by LayoutTransition when there are 'changing' animations that need 5459 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5460 * starts all pending transitions prior to the drawing phase in the current traversal. 5461 * 5462 * @param transition The LayoutTransition to be started on the next traversal. 5463 * 5464 * @hide 5465 */ 5466 public void requestTransitionStart(LayoutTransition transition) { 5467 ViewRootImpl viewAncestor = getViewRootImpl(); 5468 if (viewAncestor != null) { 5469 viewAncestor.requestTransitionStart(transition); 5470 } 5471 } 5472 5473 /** 5474 * @hide 5475 */ 5476 @Override 5477 public void resolveRtlPropertiesIfNeeded() { 5478 super.resolveRtlPropertiesIfNeeded(); 5479 int count = getChildCount(); 5480 for (int i = 0; i < count; i++) { 5481 final View child = getChildAt(i); 5482 if (child.isLayoutDirectionInherited()) { 5483 child.resolveRtlPropertiesIfNeeded(); 5484 } 5485 } 5486 } 5487 5488 /** 5489 * @hide 5490 */ 5491 @Override 5492 public boolean resolveLayoutDirection() { 5493 final boolean result = super.resolveLayoutDirection(); 5494 if (result) { 5495 int count = getChildCount(); 5496 for (int i = 0; i < count; i++) { 5497 final View child = getChildAt(i); 5498 if (child.isLayoutDirectionInherited()) { 5499 child.resolveLayoutDirection(); 5500 } 5501 } 5502 } 5503 return result; 5504 } 5505 5506 /** 5507 * @hide 5508 */ 5509 @Override 5510 public boolean resolveTextDirection() { 5511 final boolean result = super.resolveTextDirection(); 5512 if (result) { 5513 int count = getChildCount(); 5514 for (int i = 0; i < count; i++) { 5515 final View child = getChildAt(i); 5516 if (child.isTextDirectionInherited()) { 5517 child.resolveTextDirection(); 5518 } 5519 } 5520 } 5521 return result; 5522 } 5523 5524 /** 5525 * @hide 5526 */ 5527 @Override 5528 public boolean resolveTextAlignment() { 5529 final boolean result = super.resolveTextAlignment(); 5530 if (result) { 5531 int count = getChildCount(); 5532 for (int i = 0; i < count; i++) { 5533 final View child = getChildAt(i); 5534 if (child.isTextAlignmentInherited()) { 5535 child.resolveTextAlignment(); 5536 } 5537 } 5538 } 5539 return result; 5540 } 5541 5542 /** 5543 * @hide 5544 */ 5545 @Override 5546 public void resolvePadding() { 5547 super.resolvePadding(); 5548 int count = getChildCount(); 5549 for (int i = 0; i < count; i++) { 5550 final View child = getChildAt(i); 5551 if (child.isLayoutDirectionInherited()) { 5552 child.resolvePadding(); 5553 } 5554 } 5555 } 5556 5557 /** 5558 * @hide 5559 */ 5560 @Override 5561 protected void resolveDrawables() { 5562 super.resolveDrawables(); 5563 int count = getChildCount(); 5564 for (int i = 0; i < count; i++) { 5565 final View child = getChildAt(i); 5566 if (child.isLayoutDirectionInherited()) { 5567 child.resolveDrawables(); 5568 } 5569 } 5570 } 5571 5572 /** 5573 * @hide 5574 */ 5575 @Override 5576 public void resolveLayoutParams() { 5577 super.resolveLayoutParams(); 5578 int count = getChildCount(); 5579 for (int i = 0; i < count; i++) { 5580 final View child = getChildAt(i); 5581 child.resolveLayoutParams(); 5582 } 5583 } 5584 5585 /** 5586 * @hide 5587 */ 5588 @Override 5589 public void resetResolvedLayoutDirection() { 5590 super.resetResolvedLayoutDirection(); 5591 5592 int count = getChildCount(); 5593 for (int i = 0; i < count; i++) { 5594 final View child = getChildAt(i); 5595 if (child.isLayoutDirectionInherited()) { 5596 child.resetResolvedLayoutDirection(); 5597 } 5598 } 5599 } 5600 5601 /** 5602 * @hide 5603 */ 5604 @Override 5605 public void resetResolvedTextDirection() { 5606 super.resetResolvedTextDirection(); 5607 5608 int count = getChildCount(); 5609 for (int i = 0; i < count; i++) { 5610 final View child = getChildAt(i); 5611 if (child.isTextDirectionInherited()) { 5612 child.resetResolvedTextDirection(); 5613 } 5614 } 5615 } 5616 5617 /** 5618 * @hide 5619 */ 5620 @Override 5621 public void resetResolvedTextAlignment() { 5622 super.resetResolvedTextAlignment(); 5623 5624 int count = getChildCount(); 5625 for (int i = 0; i < count; i++) { 5626 final View child = getChildAt(i); 5627 if (child.isTextAlignmentInherited()) { 5628 child.resetResolvedTextAlignment(); 5629 } 5630 } 5631 } 5632 5633 /** 5634 * @hide 5635 */ 5636 @Override 5637 public void resetResolvedPadding() { 5638 super.resetResolvedPadding(); 5639 5640 int count = getChildCount(); 5641 for (int i = 0; i < count; i++) { 5642 final View child = getChildAt(i); 5643 if (child.isLayoutDirectionInherited()) { 5644 child.resetResolvedPadding(); 5645 } 5646 } 5647 } 5648 5649 /** 5650 * @hide 5651 */ 5652 @Override 5653 protected void resetResolvedDrawables() { 5654 super.resetResolvedDrawables(); 5655 5656 int count = getChildCount(); 5657 for (int i = 0; i < count; i++) { 5658 final View child = getChildAt(i); 5659 if (child.isLayoutDirectionInherited()) { 5660 child.resetResolvedDrawables(); 5661 } 5662 } 5663 } 5664 5665 /** 5666 * Return true if the pressed state should be delayed for children or descendants of this 5667 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5668 * This prevents the pressed state from appearing when the user is actually trying to scroll 5669 * the content. 5670 * 5671 * The default implementation returns true for compatibility reasons. Subclasses that do 5672 * not scroll should generally override this method and return false. 5673 */ 5674 public boolean shouldDelayChildPressedState() { 5675 return true; 5676 } 5677 5678 /** @hide */ 5679 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5680 } 5681 5682 /** 5683 * LayoutParams are used by views to tell their parents how they want to be 5684 * laid out. See 5685 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5686 * for a list of all child view attributes that this class supports. 5687 * 5688 * <p> 5689 * The base LayoutParams class just describes how big the view wants to be 5690 * for both width and height. For each dimension, it can specify one of: 5691 * <ul> 5692 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5693 * means that the view wants to be as big as its parent (minus padding) 5694 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5695 * to enclose its content (plus padding) 5696 * <li> an exact number 5697 * </ul> 5698 * There are subclasses of LayoutParams for different subclasses of 5699 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5700 * LayoutParams which adds an X and Y value.</p> 5701 * 5702 * <div class="special reference"> 5703 * <h3>Developer Guides</h3> 5704 * <p>For more information about creating user interface layouts, read the 5705 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5706 * guide.</p></div> 5707 * 5708 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5709 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5710 */ 5711 public static class LayoutParams { 5712 /** 5713 * Special value for the height or width requested by a View. 5714 * FILL_PARENT means that the view wants to be as big as its parent, 5715 * minus the parent's padding, if any. This value is deprecated 5716 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5717 */ 5718 @SuppressWarnings({"UnusedDeclaration"}) 5719 @Deprecated 5720 public static final int FILL_PARENT = -1; 5721 5722 /** 5723 * Special value for the height or width requested by a View. 5724 * MATCH_PARENT means that the view wants to be as big as its parent, 5725 * minus the parent's padding, if any. Introduced in API Level 8. 5726 */ 5727 public static final int MATCH_PARENT = -1; 5728 5729 /** 5730 * Special value for the height or width requested by a View. 5731 * WRAP_CONTENT means that the view wants to be just large enough to fit 5732 * its own internal content, taking its own padding into account. 5733 */ 5734 public static final int WRAP_CONTENT = -2; 5735 5736 /** 5737 * Information about how wide the view wants to be. Can be one of the 5738 * constants FILL_PARENT (replaced by MATCH_PARENT , 5739 * in API Level 8) or WRAP_CONTENT. or an exact size. 5740 */ 5741 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5742 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5743 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5744 }) 5745 public int width; 5746 5747 /** 5748 * Information about how tall the view wants to be. Can be one of the 5749 * constants FILL_PARENT (replaced by MATCH_PARENT , 5750 * in API Level 8) or WRAP_CONTENT. or an exact size. 5751 */ 5752 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5753 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5754 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5755 }) 5756 public int height; 5757 5758 /** 5759 * Used to animate layouts. 5760 */ 5761 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5762 5763 /** 5764 * Creates a new set of layout parameters. The values are extracted from 5765 * the supplied attributes set and context. The XML attributes mapped 5766 * to this set of layout parameters are: 5767 * 5768 * <ul> 5769 * <li><code>layout_width</code>: the width, either an exact value, 5770 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5771 * {@link #MATCH_PARENT} in API Level 8)</li> 5772 * <li><code>layout_height</code>: the height, either an exact value, 5773 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5774 * {@link #MATCH_PARENT} in API Level 8)</li> 5775 * </ul> 5776 * 5777 * @param c the application environment 5778 * @param attrs the set of attributes from which to extract the layout 5779 * parameters' values 5780 */ 5781 public LayoutParams(Context c, AttributeSet attrs) { 5782 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5783 setBaseAttributes(a, 5784 R.styleable.ViewGroup_Layout_layout_width, 5785 R.styleable.ViewGroup_Layout_layout_height); 5786 a.recycle(); 5787 } 5788 5789 /** 5790 * Creates a new set of layout parameters with the specified width 5791 * and height. 5792 * 5793 * @param width the width, either {@link #WRAP_CONTENT}, 5794 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5795 * API Level 8), or a fixed size in pixels 5796 * @param height the height, either {@link #WRAP_CONTENT}, 5797 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5798 * API Level 8), or a fixed size in pixels 5799 */ 5800 public LayoutParams(int width, int height) { 5801 this.width = width; 5802 this.height = height; 5803 } 5804 5805 /** 5806 * Copy constructor. Clones the width and height values of the source. 5807 * 5808 * @param source The layout params to copy from. 5809 */ 5810 public LayoutParams(LayoutParams source) { 5811 this.width = source.width; 5812 this.height = source.height; 5813 } 5814 5815 /** 5816 * Used internally by MarginLayoutParams. 5817 * @hide 5818 */ 5819 LayoutParams() { 5820 } 5821 5822 /** 5823 * Extracts the layout parameters from the supplied attributes. 5824 * 5825 * @param a the style attributes to extract the parameters from 5826 * @param widthAttr the identifier of the width attribute 5827 * @param heightAttr the identifier of the height attribute 5828 */ 5829 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5830 width = a.getLayoutDimension(widthAttr, "layout_width"); 5831 height = a.getLayoutDimension(heightAttr, "layout_height"); 5832 } 5833 5834 /** 5835 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5836 * layoutDirection changes should override this method. The default implementation does 5837 * nothing. 5838 * 5839 * @param layoutDirection the direction of the layout 5840 * 5841 * {@link View#LAYOUT_DIRECTION_LTR} 5842 * {@link View#LAYOUT_DIRECTION_RTL} 5843 */ 5844 public void resolveLayoutDirection(int layoutDirection) { 5845 } 5846 5847 /** 5848 * Returns a String representation of this set of layout parameters. 5849 * 5850 * @param output the String to prepend to the internal representation 5851 * @return a String with the following format: output + 5852 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5853 * 5854 * @hide 5855 */ 5856 public String debug(String output) { 5857 return output + "ViewGroup.LayoutParams={ width=" 5858 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5859 } 5860 5861 /** 5862 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5863 * 5864 * @param view the view that contains these layout parameters 5865 * @param canvas the canvas on which to draw 5866 * 5867 * @hide 5868 */ 5869 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5870 } 5871 5872 /** 5873 * Converts the specified size to a readable String. 5874 * 5875 * @param size the size to convert 5876 * @return a String instance representing the supplied size 5877 * 5878 * @hide 5879 */ 5880 protected static String sizeToString(int size) { 5881 if (size == WRAP_CONTENT) { 5882 return "wrap-content"; 5883 } 5884 if (size == MATCH_PARENT) { 5885 return "match-parent"; 5886 } 5887 return String.valueOf(size); 5888 } 5889 } 5890 5891 /** 5892 * Per-child layout information for layouts that support margins. 5893 * See 5894 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5895 * for a list of all child view attributes that this class supports. 5896 */ 5897 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5898 /** 5899 * The left margin in pixels of the child. 5900 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5901 * to this field. 5902 */ 5903 @ViewDebug.ExportedProperty(category = "layout") 5904 public int leftMargin; 5905 5906 /** 5907 * The top margin in pixels of the child. 5908 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5909 * to this field. 5910 */ 5911 @ViewDebug.ExportedProperty(category = "layout") 5912 public int topMargin; 5913 5914 /** 5915 * The right margin in pixels of the child. 5916 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5917 * to this field. 5918 */ 5919 @ViewDebug.ExportedProperty(category = "layout") 5920 public int rightMargin; 5921 5922 /** 5923 * The bottom margin in pixels of the child. 5924 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5925 * to this field. 5926 */ 5927 @ViewDebug.ExportedProperty(category = "layout") 5928 public int bottomMargin; 5929 5930 /** 5931 * The start margin in pixels of the child. 5932 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5933 * to this field. 5934 */ 5935 @ViewDebug.ExportedProperty(category = "layout") 5936 private int startMargin = DEFAULT_RELATIVE; 5937 5938 /** 5939 * The end margin in pixels of the child. 5940 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5941 * to this field. 5942 */ 5943 @ViewDebug.ExportedProperty(category = "layout") 5944 private int endMargin = DEFAULT_RELATIVE; 5945 5946 /** 5947 * The default start and end margin. 5948 * @hide 5949 */ 5950 public static final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5951 5952 private int initialLeftMargin; 5953 private int initialRightMargin; 5954 5955 private static int LAYOUT_DIRECTION_UNDEFINED = -1; 5956 5957 // Layout direction undefined by default 5958 private int layoutDirection = LAYOUT_DIRECTION_UNDEFINED; 5959 5960 /** 5961 * Creates a new set of layout parameters. The values are extracted from 5962 * the supplied attributes set and context. 5963 * 5964 * @param c the application environment 5965 * @param attrs the set of attributes from which to extract the layout 5966 * parameters' values 5967 */ 5968 public MarginLayoutParams(Context c, AttributeSet attrs) { 5969 super(); 5970 5971 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5972 setBaseAttributes(a, 5973 R.styleable.ViewGroup_MarginLayout_layout_width, 5974 R.styleable.ViewGroup_MarginLayout_layout_height); 5975 5976 int margin = a.getDimensionPixelSize( 5977 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5978 if (margin >= 0) { 5979 leftMargin = margin; 5980 topMargin = margin; 5981 rightMargin= margin; 5982 bottomMargin = margin; 5983 } else { 5984 leftMargin = a.getDimensionPixelSize( 5985 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5986 topMargin = a.getDimensionPixelSize( 5987 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5988 rightMargin = a.getDimensionPixelSize( 5989 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5990 bottomMargin = a.getDimensionPixelSize( 5991 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5992 startMargin = a.getDimensionPixelSize( 5993 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5994 endMargin = a.getDimensionPixelSize( 5995 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5996 } 5997 5998 initialLeftMargin = leftMargin; 5999 initialRightMargin = rightMargin; 6000 6001 a.recycle(); 6002 } 6003 6004 /** 6005 * {@inheritDoc} 6006 */ 6007 public MarginLayoutParams(int width, int height) { 6008 super(width, height); 6009 } 6010 6011 /** 6012 * Copy constructor. Clones the width, height and margin values of the source. 6013 * 6014 * @param source The layout params to copy from. 6015 */ 6016 public MarginLayoutParams(MarginLayoutParams source) { 6017 this.width = source.width; 6018 this.height = source.height; 6019 6020 this.leftMargin = source.leftMargin; 6021 this.topMargin = source.topMargin; 6022 this.rightMargin = source.rightMargin; 6023 this.bottomMargin = source.bottomMargin; 6024 this.startMargin = source.startMargin; 6025 this.endMargin = source.endMargin; 6026 6027 this.initialLeftMargin = source.leftMargin; 6028 this.initialRightMargin = source.rightMargin; 6029 6030 setLayoutDirection(source.layoutDirection); 6031 } 6032 6033 /** 6034 * {@inheritDoc} 6035 */ 6036 public MarginLayoutParams(LayoutParams source) { 6037 super(source); 6038 } 6039 6040 /** 6041 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6042 * to be done so that the new margins are taken into account. Left and right margins may be 6043 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6044 * 6045 * @param left the left margin size 6046 * @param top the top margin size 6047 * @param right the right margin size 6048 * @param bottom the bottom margin size 6049 * 6050 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6051 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6052 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6053 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6054 */ 6055 public void setMargins(int left, int top, int right, int bottom) { 6056 leftMargin = left; 6057 topMargin = top; 6058 rightMargin = right; 6059 bottomMargin = bottom; 6060 initialLeftMargin = left; 6061 initialRightMargin = right; 6062 } 6063 6064 /** 6065 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6066 * needs to be done so that the new relative margins are taken into account. Left and right 6067 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6068 * direction. 6069 * 6070 * @param start the start margin size 6071 * @param top the top margin size 6072 * @param end the right margin size 6073 * @param bottom the bottom margin size 6074 * 6075 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6076 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6077 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6078 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6079 * 6080 * @hide 6081 */ 6082 public void setMarginsRelative(int start, int top, int end, int bottom) { 6083 startMargin = start; 6084 topMargin = top; 6085 endMargin = end; 6086 bottomMargin = bottom; 6087 initialLeftMargin = 0; 6088 initialRightMargin = 0; 6089 } 6090 6091 /** 6092 * Sets the relative start margin. 6093 * 6094 * @param start the start margin size 6095 * 6096 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6097 */ 6098 public void setMarginStart(int start) { 6099 startMargin = start; 6100 } 6101 6102 /** 6103 * Returns the start margin in pixels. 6104 * 6105 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6106 * 6107 * @return the start margin in pixels. 6108 */ 6109 public int getMarginStart() { 6110 if (startMargin != DEFAULT_RELATIVE) return startMargin; 6111 switch(layoutDirection) { 6112 case View.LAYOUT_DIRECTION_RTL: 6113 return rightMargin; 6114 case View.LAYOUT_DIRECTION_LTR: 6115 default: 6116 return leftMargin; 6117 } 6118 } 6119 6120 /** 6121 * Sets the relative end margin. 6122 * 6123 * @param end the end margin size 6124 * 6125 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6126 */ 6127 public void setMarginEnd(int end) { 6128 endMargin = end; 6129 } 6130 6131 /** 6132 * Returns the end margin in pixels. 6133 * 6134 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6135 * 6136 * @return the end margin in pixels. 6137 */ 6138 public int getMarginEnd() { 6139 if (endMargin != DEFAULT_RELATIVE) return endMargin; 6140 switch(layoutDirection) { 6141 case View.LAYOUT_DIRECTION_RTL: 6142 return leftMargin; 6143 case View.LAYOUT_DIRECTION_LTR: 6144 default: 6145 return rightMargin; 6146 } 6147 } 6148 6149 /** 6150 * Check if margins are relative. 6151 * 6152 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6153 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6154 * 6155 * @return true if either marginStart or marginEnd has been set. 6156 */ 6157 public boolean isMarginRelative() { 6158 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 6159 } 6160 6161 /** 6162 * Set the layout direction 6163 * @param layoutDirection the layout direction. 6164 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6165 * or {@link View#LAYOUT_DIRECTION_RTL}. 6166 */ 6167 public void setLayoutDirection(int layoutDirection) { 6168 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6169 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6170 this.layoutDirection = layoutDirection; 6171 } 6172 6173 /** 6174 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6175 * {@link View#LAYOUT_DIRECTION_RTL}. 6176 * 6177 * @return the layout direction. 6178 */ 6179 public int getLayoutDirection() { 6180 return layoutDirection; 6181 } 6182 6183 /** 6184 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6185 * may be overridden depending on layout direction. 6186 */ 6187 @Override 6188 public void resolveLayoutDirection(int layoutDirection) { 6189 setLayoutDirection(layoutDirection); 6190 6191 if (!isMarginRelative()) return; 6192 6193 switch(layoutDirection) { 6194 case View.LAYOUT_DIRECTION_RTL: 6195 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialLeftMargin; 6196 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialRightMargin; 6197 break; 6198 case View.LAYOUT_DIRECTION_LTR: 6199 default: 6200 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialLeftMargin; 6201 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialRightMargin; 6202 break; 6203 } 6204 } 6205 6206 /** 6207 * @hide 6208 */ 6209 public boolean isLayoutRtl() { 6210 return (layoutDirection == View.LAYOUT_DIRECTION_RTL); 6211 } 6212 6213 /** 6214 * @hide 6215 */ 6216 @Override 6217 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6218 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6219 6220 fillDifference(canvas, 6221 view.getLeft() + oi.left, 6222 view.getTop() + oi.top, 6223 view.getRight() - oi.right, 6224 view.getBottom() - oi.bottom, 6225 leftMargin, 6226 topMargin, 6227 rightMargin, 6228 bottomMargin, 6229 paint); 6230 } 6231 } 6232 6233 /* Describes a touched view and the ids of the pointers that it has captured. 6234 * 6235 * This code assumes that pointer ids are always in the range 0..31 such that 6236 * it can use a bitfield to track which pointer ids are present. 6237 * As it happens, the lower layers of the input dispatch pipeline also use the 6238 * same trick so the assumption should be safe here... 6239 */ 6240 private static final class TouchTarget { 6241 private static final int MAX_RECYCLED = 32; 6242 private static final Object sRecycleLock = new Object(); 6243 private static TouchTarget sRecycleBin; 6244 private static int sRecycledCount; 6245 6246 public static final int ALL_POINTER_IDS = -1; // all ones 6247 6248 // The touched child view. 6249 public View child; 6250 6251 // The combined bit mask of pointer ids for all pointers captured by the target. 6252 public int pointerIdBits; 6253 6254 // The next target in the target list. 6255 public TouchTarget next; 6256 6257 private TouchTarget() { 6258 } 6259 6260 public static TouchTarget obtain(View child, int pointerIdBits) { 6261 final TouchTarget target; 6262 synchronized (sRecycleLock) { 6263 if (sRecycleBin == null) { 6264 target = new TouchTarget(); 6265 } else { 6266 target = sRecycleBin; 6267 sRecycleBin = target.next; 6268 sRecycledCount--; 6269 target.next = null; 6270 } 6271 } 6272 target.child = child; 6273 target.pointerIdBits = pointerIdBits; 6274 return target; 6275 } 6276 6277 public void recycle() { 6278 synchronized (sRecycleLock) { 6279 if (sRecycledCount < MAX_RECYCLED) { 6280 next = sRecycleBin; 6281 sRecycleBin = this; 6282 sRecycledCount += 1; 6283 } else { 6284 next = null; 6285 } 6286 child = null; 6287 } 6288 } 6289 } 6290 6291 /* Describes a hovered view. */ 6292 private static final class HoverTarget { 6293 private static final int MAX_RECYCLED = 32; 6294 private static final Object sRecycleLock = new Object(); 6295 private static HoverTarget sRecycleBin; 6296 private static int sRecycledCount; 6297 6298 // The hovered child view. 6299 public View child; 6300 6301 // The next target in the target list. 6302 public HoverTarget next; 6303 6304 private HoverTarget() { 6305 } 6306 6307 public static HoverTarget obtain(View child) { 6308 final HoverTarget target; 6309 synchronized (sRecycleLock) { 6310 if (sRecycleBin == null) { 6311 target = new HoverTarget(); 6312 } else { 6313 target = sRecycleBin; 6314 sRecycleBin = target.next; 6315 sRecycledCount--; 6316 target.next = null; 6317 } 6318 } 6319 target.child = child; 6320 return target; 6321 } 6322 6323 public void recycle() { 6324 synchronized (sRecycleLock) { 6325 if (sRecycledCount < MAX_RECYCLED) { 6326 next = sRecycleBin; 6327 sRecycleBin = this; 6328 sRecycledCount += 1; 6329 } else { 6330 next = null; 6331 } 6332 child = null; 6333 } 6334 } 6335 } 6336 6337 /** 6338 * Pooled class that orderes the children of a ViewGroup from start 6339 * to end based on how they are laid out and the layout direction. 6340 */ 6341 static class ChildListForAccessibility { 6342 6343 private static final int MAX_POOL_SIZE = 32; 6344 6345 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6346 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6347 6348 private final ArrayList<View> mChildren = new ArrayList<View>(); 6349 6350 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6351 6352 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6353 ChildListForAccessibility list = sPool.acquire(); 6354 if (list == null) { 6355 list = new ChildListForAccessibility(); 6356 } 6357 list.init(parent, sort); 6358 return list; 6359 } 6360 6361 public void recycle() { 6362 clear(); 6363 sPool.release(this); 6364 } 6365 6366 public int getChildCount() { 6367 return mChildren.size(); 6368 } 6369 6370 public View getChildAt(int index) { 6371 return mChildren.get(index); 6372 } 6373 6374 public int getChildIndex(View child) { 6375 return mChildren.indexOf(child); 6376 } 6377 6378 private void init(ViewGroup parent, boolean sort) { 6379 ArrayList<View> children = mChildren; 6380 final int childCount = parent.getChildCount(); 6381 for (int i = 0; i < childCount; i++) { 6382 View child = parent.getChildAt(i); 6383 children.add(child); 6384 } 6385 if (sort) { 6386 ArrayList<ViewLocationHolder> holders = mHolders; 6387 for (int i = 0; i < childCount; i++) { 6388 View child = children.get(i); 6389 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6390 holders.add(holder); 6391 } 6392 Collections.sort(holders); 6393 for (int i = 0; i < childCount; i++) { 6394 ViewLocationHolder holder = holders.get(i); 6395 children.set(i, holder.mView); 6396 holder.recycle(); 6397 } 6398 holders.clear(); 6399 } 6400 } 6401 6402 private void clear() { 6403 mChildren.clear(); 6404 } 6405 } 6406 6407 /** 6408 * Pooled class that holds a View and its location with respect to 6409 * a specified root. This enables sorting of views based on their 6410 * coordinates without recomputing the position relative to the root 6411 * on every comparison. 6412 */ 6413 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6414 6415 private static final int MAX_POOL_SIZE = 32; 6416 6417 private static final SynchronizedPool<ViewLocationHolder> sPool = 6418 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6419 6420 private final Rect mLocation = new Rect(); 6421 6422 public View mView; 6423 6424 private int mLayoutDirection; 6425 6426 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6427 ViewLocationHolder holder = sPool.acquire(); 6428 if (holder == null) { 6429 holder = new ViewLocationHolder(); 6430 } 6431 holder.init(root, view); 6432 return holder; 6433 } 6434 6435 public void recycle() { 6436 clear(); 6437 sPool.release(this); 6438 } 6439 6440 @Override 6441 public int compareTo(ViewLocationHolder another) { 6442 // This instance is greater than an invalid argument. 6443 if (another == null) { 6444 return 1; 6445 } 6446 if (getClass() != another.getClass()) { 6447 return 1; 6448 } 6449 // First is above second. 6450 if (mLocation.bottom - another.mLocation.top <= 0) { 6451 return -1; 6452 } 6453 // First is below second. 6454 if (mLocation.top - another.mLocation.bottom >= 0) { 6455 return 1; 6456 } 6457 // LTR 6458 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6459 final int leftDifference = mLocation.left - another.mLocation.left; 6460 // First more to the left than second. 6461 if (leftDifference != 0) { 6462 return leftDifference; 6463 } 6464 } else { // RTL 6465 final int rightDifference = mLocation.right - another.mLocation.right; 6466 // First more to the right than second. 6467 if (rightDifference != 0) { 6468 return -rightDifference; 6469 } 6470 } 6471 // Break tie by top. 6472 final int topDiference = mLocation.top - another.mLocation.top; 6473 if (topDiference != 0) { 6474 return topDiference; 6475 } 6476 // Break tie by height. 6477 final int heightDiference = mLocation.height() - another.mLocation.height(); 6478 if (heightDiference != 0) { 6479 return -heightDiference; 6480 } 6481 // Break tie by width. 6482 final int widthDiference = mLocation.width() - another.mLocation.width(); 6483 if (widthDiference != 0) { 6484 return -widthDiference; 6485 } 6486 // Just break the tie somehow. The accessibliity ids are unique 6487 // and stable, hence this is deterministic tie breaking. 6488 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6489 } 6490 6491 private void init(ViewGroup root, View view) { 6492 Rect viewLocation = mLocation; 6493 view.getDrawingRect(viewLocation); 6494 root.offsetDescendantRectToMyCoords(view, viewLocation); 6495 mView = view; 6496 mLayoutDirection = root.getLayoutDirection(); 6497 } 6498 6499 private void clear() { 6500 mView = null; 6501 mLocation.set(0, 0, 0, 0); 6502 } 6503 } 6504 6505 private static Paint getDebugPaint() { 6506 if (sDebugPaint == null) { 6507 sDebugPaint = new Paint(); 6508 sDebugPaint.setAntiAlias(false); 6509 } 6510 return sDebugPaint; 6511 } 6512 6513 private void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6514 if (sDebugLines== null) { 6515 sDebugLines = new float[16]; 6516 } 6517 6518 sDebugLines[0] = x1; 6519 sDebugLines[1] = y1; 6520 sDebugLines[2] = x2; 6521 sDebugLines[3] = y1; 6522 6523 sDebugLines[4] = x2; 6524 sDebugLines[5] = y1; 6525 sDebugLines[6] = x2; 6526 sDebugLines[7] = y2; 6527 6528 sDebugLines[8] = x2; 6529 sDebugLines[9] = y2; 6530 sDebugLines[10] = x1; 6531 sDebugLines[11] = y2; 6532 6533 sDebugLines[12] = x1; 6534 sDebugLines[13] = y2; 6535 sDebugLines[14] = x1; 6536 sDebugLines[15] = y1; 6537 6538 canvas.drawLines(sDebugLines, paint); 6539 } 6540} 6541