AbsListView.java revision a277db28e990d1f6f74ace0c32fe92401660a840
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.widget; 18 19import android.content.Context; 20import android.content.Intent; 21import android.content.res.TypedArray; 22import android.graphics.Canvas; 23import android.graphics.Rect; 24import android.graphics.drawable.Drawable; 25import android.graphics.drawable.TransitionDrawable; 26import android.os.Bundle; 27import android.os.Debug; 28import android.os.Parcel; 29import android.os.Parcelable; 30import android.os.StrictMode; 31import android.os.Trace; 32import android.text.Editable; 33import android.text.InputType; 34import android.text.TextUtils; 35import android.text.TextWatcher; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.LongSparseArray; 39import android.util.SparseArray; 40import android.util.SparseBooleanArray; 41import android.util.StateSet; 42import android.view.ActionMode; 43import android.view.ContextMenu.ContextMenuInfo; 44import android.view.Gravity; 45import android.view.HapticFeedbackConstants; 46import android.view.InputDevice; 47import android.view.KeyEvent; 48import android.view.LayoutInflater; 49import android.view.Menu; 50import android.view.MenuItem; 51import android.view.MotionEvent; 52import android.view.VelocityTracker; 53import android.view.View; 54import android.view.ViewConfiguration; 55import android.view.ViewDebug; 56import android.view.ViewGroup; 57import android.view.ViewParent; 58import android.view.ViewTreeObserver; 59import android.view.accessibility.AccessibilityEvent; 60import android.view.accessibility.AccessibilityManager; 61import android.view.accessibility.AccessibilityNodeInfo; 62import android.view.accessibility.AccessibilityNodeInfo.CollectionInfo; 63import android.view.animation.Interpolator; 64import android.view.animation.LinearInterpolator; 65import android.view.inputmethod.BaseInputConnection; 66import android.view.inputmethod.CompletionInfo; 67import android.view.inputmethod.CorrectionInfo; 68import android.view.inputmethod.EditorInfo; 69import android.view.inputmethod.ExtractedText; 70import android.view.inputmethod.ExtractedTextRequest; 71import android.view.inputmethod.InputConnection; 72import android.view.inputmethod.InputMethodManager; 73import android.widget.RemoteViews.OnClickHandler; 74 75import com.android.internal.R; 76 77import java.util.ArrayList; 78import java.util.List; 79 80/** 81 * Base class that can be used to implement virtualized lists of items. A list does 82 * not have a spatial definition here. For instance, subclases of this class can 83 * display the content of the list in a grid, in a carousel, as stack, etc. 84 * 85 * @attr ref android.R.styleable#AbsListView_listSelector 86 * @attr ref android.R.styleable#AbsListView_drawSelectorOnTop 87 * @attr ref android.R.styleable#AbsListView_stackFromBottom 88 * @attr ref android.R.styleable#AbsListView_scrollingCache 89 * @attr ref android.R.styleable#AbsListView_textFilterEnabled 90 * @attr ref android.R.styleable#AbsListView_transcriptMode 91 * @attr ref android.R.styleable#AbsListView_cacheColorHint 92 * @attr ref android.R.styleable#AbsListView_fastScrollEnabled 93 * @attr ref android.R.styleable#AbsListView_smoothScrollbar 94 * @attr ref android.R.styleable#AbsListView_choiceMode 95 */ 96public abstract class AbsListView extends AdapterView<ListAdapter> implements TextWatcher, 97 ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener, 98 ViewTreeObserver.OnTouchModeChangeListener, 99 RemoteViewsAdapter.RemoteAdapterConnectionCallback { 100 101 @SuppressWarnings("UnusedDeclaration") 102 private static final String TAG = "AbsListView"; 103 104 /** 105 * Disables the transcript mode. 106 * 107 * @see #setTranscriptMode(int) 108 */ 109 public static final int TRANSCRIPT_MODE_DISABLED = 0; 110 111 /** 112 * The list will automatically scroll to the bottom when a data set change 113 * notification is received and only if the last item is already visible 114 * on screen. 115 * 116 * @see #setTranscriptMode(int) 117 */ 118 public static final int TRANSCRIPT_MODE_NORMAL = 1; 119 120 /** 121 * The list will automatically scroll to the bottom, no matter what items 122 * are currently visible. 123 * 124 * @see #setTranscriptMode(int) 125 */ 126 public static final int TRANSCRIPT_MODE_ALWAYS_SCROLL = 2; 127 128 /** 129 * Indicates that we are not in the middle of a touch gesture 130 */ 131 static final int TOUCH_MODE_REST = -1; 132 133 /** 134 * Indicates we just received the touch event and we are waiting to see if the it is a tap or a 135 * scroll gesture. 136 */ 137 static final int TOUCH_MODE_DOWN = 0; 138 139 /** 140 * Indicates the touch has been recognized as a tap and we are now waiting to see if the touch 141 * is a longpress 142 */ 143 static final int TOUCH_MODE_TAP = 1; 144 145 /** 146 * Indicates we have waited for everything we can wait for, but the user's finger is still down 147 */ 148 static final int TOUCH_MODE_DONE_WAITING = 2; 149 150 /** 151 * Indicates the touch gesture is a scroll 152 */ 153 static final int TOUCH_MODE_SCROLL = 3; 154 155 /** 156 * Indicates the view is in the process of being flung 157 */ 158 static final int TOUCH_MODE_FLING = 4; 159 160 /** 161 * Indicates the touch gesture is an overscroll - a scroll beyond the beginning or end. 162 */ 163 static final int TOUCH_MODE_OVERSCROLL = 5; 164 165 /** 166 * Indicates the view is being flung outside of normal content bounds 167 * and will spring back. 168 */ 169 static final int TOUCH_MODE_OVERFLING = 6; 170 171 /** 172 * Regular layout - usually an unsolicited layout from the view system 173 */ 174 static final int LAYOUT_NORMAL = 0; 175 176 /** 177 * Show the first item 178 */ 179 static final int LAYOUT_FORCE_TOP = 1; 180 181 /** 182 * Force the selected item to be on somewhere on the screen 183 */ 184 static final int LAYOUT_SET_SELECTION = 2; 185 186 /** 187 * Show the last item 188 */ 189 static final int LAYOUT_FORCE_BOTTOM = 3; 190 191 /** 192 * Make a mSelectedItem appear in a specific location and build the rest of 193 * the views from there. The top is specified by mSpecificTop. 194 */ 195 static final int LAYOUT_SPECIFIC = 4; 196 197 /** 198 * Layout to sync as a result of a data change. Restore mSyncPosition to have its top 199 * at mSpecificTop 200 */ 201 static final int LAYOUT_SYNC = 5; 202 203 /** 204 * Layout as a result of using the navigation keys 205 */ 206 static final int LAYOUT_MOVE_SELECTION = 6; 207 208 /** 209 * Normal list that does not indicate choices 210 */ 211 public static final int CHOICE_MODE_NONE = 0; 212 213 /** 214 * The list allows up to one choice 215 */ 216 public static final int CHOICE_MODE_SINGLE = 1; 217 218 /** 219 * The list allows multiple choices 220 */ 221 public static final int CHOICE_MODE_MULTIPLE = 2; 222 223 /** 224 * The list allows multiple choices in a modal selection mode 225 */ 226 public static final int CHOICE_MODE_MULTIPLE_MODAL = 3; 227 228 /** 229 * The thread that created this view. 230 */ 231 private final Thread mOwnerThread; 232 233 /** 234 * Controls if/how the user may choose/check items in the list 235 */ 236 int mChoiceMode = CHOICE_MODE_NONE; 237 238 /** 239 * Controls CHOICE_MODE_MULTIPLE_MODAL. null when inactive. 240 */ 241 ActionMode mChoiceActionMode; 242 243 /** 244 * Wrapper for the multiple choice mode callback; AbsListView needs to perform 245 * a few extra actions around what application code does. 246 */ 247 MultiChoiceModeWrapper mMultiChoiceModeCallback; 248 249 /** 250 * Running count of how many items are currently checked 251 */ 252 int mCheckedItemCount; 253 254 /** 255 * Running state of which positions are currently checked 256 */ 257 SparseBooleanArray mCheckStates; 258 259 /** 260 * Running state of which IDs are currently checked. 261 * If there is a value for a given key, the checked state for that ID is true 262 * and the value holds the last known position in the adapter for that id. 263 */ 264 LongSparseArray<Integer> mCheckedIdStates; 265 266 /** 267 * Controls how the next layout will happen 268 */ 269 int mLayoutMode = LAYOUT_NORMAL; 270 271 /** 272 * Should be used by subclasses to listen to changes in the dataset 273 */ 274 AdapterDataSetObserver mDataSetObserver; 275 276 /** 277 * The adapter containing the data to be displayed by this view 278 */ 279 ListAdapter mAdapter; 280 281 /** 282 * The remote adapter containing the data to be displayed by this view to be set 283 */ 284 private RemoteViewsAdapter mRemoteAdapter; 285 286 /** 287 * If mAdapter != null, whenever this is true the adapter has stable IDs. 288 */ 289 boolean mAdapterHasStableIds; 290 291 /** 292 * This flag indicates the a full notify is required when the RemoteViewsAdapter connects 293 */ 294 private boolean mDeferNotifyDataSetChanged = false; 295 296 /** 297 * Indicates whether the list selector should be drawn on top of the children or behind 298 */ 299 boolean mDrawSelectorOnTop = false; 300 301 /** 302 * The drawable used to draw the selector 303 */ 304 Drawable mSelector; 305 306 /** 307 * The current position of the selector in the list. 308 */ 309 int mSelectorPosition = INVALID_POSITION; 310 311 /** 312 * Defines the selector's location and dimension at drawing time 313 */ 314 Rect mSelectorRect = new Rect(); 315 316 /** 317 * The data set used to store unused views that should be reused during the next layout 318 * to avoid creating new ones 319 */ 320 final RecycleBin mRecycler = new RecycleBin(); 321 322 /** 323 * The selection's left padding 324 */ 325 int mSelectionLeftPadding = 0; 326 327 /** 328 * The selection's top padding 329 */ 330 int mSelectionTopPadding = 0; 331 332 /** 333 * The selection's right padding 334 */ 335 int mSelectionRightPadding = 0; 336 337 /** 338 * The selection's bottom padding 339 */ 340 int mSelectionBottomPadding = 0; 341 342 /** 343 * This view's padding 344 */ 345 Rect mListPadding = new Rect(); 346 347 /** 348 * Subclasses must retain their measure spec from onMeasure() into this member 349 */ 350 int mWidthMeasureSpec = 0; 351 352 /** 353 * The top scroll indicator 354 */ 355 View mScrollUp; 356 357 /** 358 * The down scroll indicator 359 */ 360 View mScrollDown; 361 362 /** 363 * When the view is scrolling, this flag is set to true to indicate subclasses that 364 * the drawing cache was enabled on the children 365 */ 366 boolean mCachingStarted; 367 boolean mCachingActive; 368 369 /** 370 * The position of the view that received the down motion event 371 */ 372 int mMotionPosition; 373 374 /** 375 * The offset to the top of the mMotionPosition view when the down motion event was received 376 */ 377 int mMotionViewOriginalTop; 378 379 /** 380 * The desired offset to the top of the mMotionPosition view after a scroll 381 */ 382 int mMotionViewNewTop; 383 384 /** 385 * The X value associated with the the down motion event 386 */ 387 int mMotionX; 388 389 /** 390 * The Y value associated with the the down motion event 391 */ 392 int mMotionY; 393 394 /** 395 * One of TOUCH_MODE_REST, TOUCH_MODE_DOWN, TOUCH_MODE_TAP, TOUCH_MODE_SCROLL, or 396 * TOUCH_MODE_DONE_WAITING 397 */ 398 int mTouchMode = TOUCH_MODE_REST; 399 400 /** 401 * Y value from on the previous motion event (if any) 402 */ 403 int mLastY; 404 405 /** 406 * How far the finger moved before we started scrolling 407 */ 408 int mMotionCorrection; 409 410 /** 411 * Determines speed during touch scrolling 412 */ 413 private VelocityTracker mVelocityTracker; 414 415 /** 416 * Handles one frame of a fling 417 */ 418 private FlingRunnable mFlingRunnable; 419 420 /** 421 * Handles scrolling between positions within the list. 422 */ 423 AbsPositionScroller mPositionScroller; 424 425 /** 426 * The offset in pixels form the top of the AdapterView to the top 427 * of the currently selected view. Used to save and restore state. 428 */ 429 int mSelectedTop = 0; 430 431 /** 432 * Indicates whether the list is stacked from the bottom edge or 433 * the top edge. 434 */ 435 boolean mStackFromBottom; 436 437 /** 438 * When set to true, the list automatically discards the children's 439 * bitmap cache after scrolling. 440 */ 441 boolean mScrollingCacheEnabled; 442 443 /** 444 * Whether or not to enable the fast scroll feature on this list 445 */ 446 boolean mFastScrollEnabled; 447 448 /** 449 * Whether or not to always show the fast scroll feature on this list 450 */ 451 boolean mFastScrollAlwaysVisible; 452 453 /** 454 * Optional callback to notify client when scroll position has changed 455 */ 456 private OnScrollListener mOnScrollListener; 457 458 /** 459 * Keeps track of our accessory window 460 */ 461 PopupWindow mPopup; 462 463 /** 464 * Used with type filter window 465 */ 466 EditText mTextFilter; 467 468 /** 469 * Indicates whether to use pixels-based or position-based scrollbar 470 * properties. 471 */ 472 private boolean mSmoothScrollbarEnabled = true; 473 474 /** 475 * Indicates that this view supports filtering 476 */ 477 private boolean mTextFilterEnabled; 478 479 /** 480 * Indicates that this view is currently displaying a filtered view of the data 481 */ 482 private boolean mFiltered; 483 484 /** 485 * Rectangle used for hit testing children 486 */ 487 private Rect mTouchFrame; 488 489 /** 490 * The position to resurrect the selected position to. 491 */ 492 int mResurrectToPosition = INVALID_POSITION; 493 494 private ContextMenuInfo mContextMenuInfo = null; 495 496 /** 497 * Maximum distance to record overscroll 498 */ 499 int mOverscrollMax; 500 501 /** 502 * Content height divided by this is the overscroll limit. 503 */ 504 static final int OVERSCROLL_LIMIT_DIVISOR = 3; 505 506 /** 507 * How many positions in either direction we will search to try to 508 * find a checked item with a stable ID that moved position across 509 * a data set change. If the item isn't found it will be unselected. 510 */ 511 private static final int CHECK_POSITION_SEARCH_DISTANCE = 20; 512 513 /** 514 * Used to request a layout when we changed touch mode 515 */ 516 private static final int TOUCH_MODE_UNKNOWN = -1; 517 private static final int TOUCH_MODE_ON = 0; 518 private static final int TOUCH_MODE_OFF = 1; 519 520 private int mLastTouchMode = TOUCH_MODE_UNKNOWN; 521 522 private static final boolean PROFILE_SCROLLING = false; 523 private boolean mScrollProfilingStarted = false; 524 525 private static final boolean PROFILE_FLINGING = false; 526 private boolean mFlingProfilingStarted = false; 527 528 /** 529 * The StrictMode "critical time span" objects to catch animation 530 * stutters. Non-null when a time-sensitive animation is 531 * in-flight. Must call finish() on them when done animating. 532 * These are no-ops on user builds. 533 */ 534 private StrictMode.Span mScrollStrictSpan = null; 535 private StrictMode.Span mFlingStrictSpan = null; 536 537 /** 538 * The last CheckForLongPress runnable we posted, if any 539 */ 540 private CheckForLongPress mPendingCheckForLongPress; 541 542 /** 543 * The last CheckForTap runnable we posted, if any 544 */ 545 private CheckForTap mPendingCheckForTap; 546 547 /** 548 * The last CheckForKeyLongPress runnable we posted, if any 549 */ 550 private CheckForKeyLongPress mPendingCheckForKeyLongPress; 551 552 /** 553 * Acts upon click 554 */ 555 private AbsListView.PerformClick mPerformClick; 556 557 /** 558 * Delayed action for touch mode. 559 */ 560 private Runnable mTouchModeReset; 561 562 /** 563 * This view is in transcript mode -- it shows the bottom of the list when the data 564 * changes 565 */ 566 private int mTranscriptMode; 567 568 /** 569 * Indicates that this list is always drawn on top of a solid, single-color, opaque 570 * background 571 */ 572 private int mCacheColorHint; 573 574 /** 575 * The select child's view (from the adapter's getView) is enabled. 576 */ 577 private boolean mIsChildViewEnabled; 578 579 /** 580 * The last scroll state reported to clients through {@link OnScrollListener}. 581 */ 582 private int mLastScrollState = OnScrollListener.SCROLL_STATE_IDLE; 583 584 /** 585 * Helper object that renders and controls the fast scroll thumb. 586 */ 587 private FastScroller mFastScroll; 588 589 /** 590 * Temporary holder for fast scroller style until a FastScroller object 591 * is created. 592 */ 593 private int mFastScrollStyle; 594 595 private boolean mGlobalLayoutListenerAddedFilter; 596 597 private int mTouchSlop; 598 private float mDensityScale; 599 600 private InputConnection mDefInputConnection; 601 private InputConnectionWrapper mPublicInputConnection; 602 603 private Runnable mClearScrollingCache; 604 Runnable mPositionScrollAfterLayout; 605 private int mMinimumVelocity; 606 private int mMaximumVelocity; 607 private float mVelocityScale = 1.0f; 608 609 final boolean[] mIsScrap = new boolean[1]; 610 611 private final int[] mScrollOffset = new int[2]; 612 private final int[] mScrollConsumed = new int[2]; 613 614 // True when the popup should be hidden because of a call to 615 // dispatchDisplayHint() 616 private boolean mPopupHidden; 617 618 /** 619 * ID of the active pointer. This is used to retain consistency during 620 * drags/flings if multiple pointers are used. 621 */ 622 private int mActivePointerId = INVALID_POINTER; 623 624 /** 625 * Sentinel value for no current active pointer. 626 * Used by {@link #mActivePointerId}. 627 */ 628 private static final int INVALID_POINTER = -1; 629 630 /** 631 * Maximum distance to overscroll by during edge effects 632 */ 633 int mOverscrollDistance; 634 635 /** 636 * Maximum distance to overfling during edge effects 637 */ 638 int mOverflingDistance; 639 640 // These two EdgeGlows are always set and used together. 641 // Checking one for null is as good as checking both. 642 643 /** 644 * Tracks the state of the top edge glow. 645 */ 646 private EdgeEffect mEdgeGlowTop; 647 648 /** 649 * Tracks the state of the bottom edge glow. 650 */ 651 private EdgeEffect mEdgeGlowBottom; 652 653 /** 654 * An estimate of how many pixels are between the top of the list and 655 * the top of the first position in the adapter, based on the last time 656 * we saw it. Used to hint where to draw edge glows. 657 */ 658 private int mFirstPositionDistanceGuess; 659 660 /** 661 * An estimate of how many pixels are between the bottom of the list and 662 * the bottom of the last position in the adapter, based on the last time 663 * we saw it. Used to hint where to draw edge glows. 664 */ 665 private int mLastPositionDistanceGuess; 666 667 /** 668 * Used for determining when to cancel out of overscroll. 669 */ 670 private int mDirection = 0; 671 672 /** 673 * Tracked on measurement in transcript mode. Makes sure that we can still pin to 674 * the bottom correctly on resizes. 675 */ 676 private boolean mForceTranscriptScroll; 677 678 private int mGlowPaddingLeft; 679 private int mGlowPaddingRight; 680 681 /** 682 * Used for interacting with list items from an accessibility service. 683 */ 684 private ListItemAccessibilityDelegate mAccessibilityDelegate; 685 686 private int mLastAccessibilityScrollEventFromIndex; 687 private int mLastAccessibilityScrollEventToIndex; 688 689 /** 690 * Track the item count from the last time we handled a data change. 691 */ 692 private int mLastHandledItemCount; 693 694 /** 695 * Used for smooth scrolling at a consistent rate 696 */ 697 static final Interpolator sLinearInterpolator = new LinearInterpolator(); 698 699 /** 700 * The saved state that we will be restoring from when we next sync. 701 * Kept here so that if we happen to be asked to save our state before 702 * the sync happens, we can return this existing data rather than losing 703 * it. 704 */ 705 private SavedState mPendingSync; 706 707 /** 708 * Whether the view is in the process of detaching from its window. 709 */ 710 private boolean mIsDetaching; 711 712 /** 713 * Interface definition for a callback to be invoked when the list or grid 714 * has been scrolled. 715 */ 716 public interface OnScrollListener { 717 718 /** 719 * The view is not scrolling. Note navigating the list using the trackball counts as 720 * being in the idle state since these transitions are not animated. 721 */ 722 public static int SCROLL_STATE_IDLE = 0; 723 724 /** 725 * The user is scrolling using touch, and their finger is still on the screen 726 */ 727 public static int SCROLL_STATE_TOUCH_SCROLL = 1; 728 729 /** 730 * The user had previously been scrolling using touch and had performed a fling. The 731 * animation is now coasting to a stop 732 */ 733 public static int SCROLL_STATE_FLING = 2; 734 735 /** 736 * Callback method to be invoked while the list view or grid view is being scrolled. If the 737 * view is being scrolled, this method will be called before the next frame of the scroll is 738 * rendered. In particular, it will be called before any calls to 739 * {@link Adapter#getView(int, View, ViewGroup)}. 740 * 741 * @param view The view whose scroll state is being reported 742 * 743 * @param scrollState The current scroll state. One of 744 * {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}. 745 */ 746 public void onScrollStateChanged(AbsListView view, int scrollState); 747 748 /** 749 * Callback method to be invoked when the list or grid has been scrolled. This will be 750 * called after the scroll has completed 751 * @param view The view whose scroll state is being reported 752 * @param firstVisibleItem the index of the first visible cell (ignore if 753 * visibleItemCount == 0) 754 * @param visibleItemCount the number of visible cells 755 * @param totalItemCount the number of items in the list adaptor 756 */ 757 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, 758 int totalItemCount); 759 } 760 761 /** 762 * The top-level view of a list item can implement this interface to allow 763 * itself to modify the bounds of the selection shown for that item. 764 */ 765 public interface SelectionBoundsAdjuster { 766 /** 767 * Called to allow the list item to adjust the bounds shown for 768 * its selection. 769 * 770 * @param bounds On call, this contains the bounds the list has 771 * selected for the item (that is the bounds of the entire view). The 772 * values can be modified as desired. 773 */ 774 public void adjustListItemSelectionBounds(Rect bounds); 775 } 776 777 public AbsListView(Context context) { 778 super(context); 779 initAbsListView(); 780 781 mOwnerThread = Thread.currentThread(); 782 783 setVerticalScrollBarEnabled(true); 784 TypedArray a = context.obtainStyledAttributes(R.styleable.View); 785 initializeScrollbarsInternal(a); 786 a.recycle(); 787 } 788 789 public AbsListView(Context context, AttributeSet attrs) { 790 this(context, attrs, com.android.internal.R.attr.absListViewStyle); 791 } 792 793 public AbsListView(Context context, AttributeSet attrs, int defStyleAttr) { 794 this(context, attrs, defStyleAttr, 0); 795 } 796 797 public AbsListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 798 super(context, attrs, defStyleAttr, defStyleRes); 799 initAbsListView(); 800 801 mOwnerThread = Thread.currentThread(); 802 803 final TypedArray a = context.obtainStyledAttributes( 804 attrs, com.android.internal.R.styleable.AbsListView, defStyleAttr, defStyleRes); 805 806 Drawable d = a.getDrawable(com.android.internal.R.styleable.AbsListView_listSelector); 807 if (d != null) { 808 setSelector(d); 809 } 810 811 mDrawSelectorOnTop = a.getBoolean( 812 com.android.internal.R.styleable.AbsListView_drawSelectorOnTop, false); 813 814 boolean stackFromBottom = a.getBoolean(R.styleable.AbsListView_stackFromBottom, false); 815 setStackFromBottom(stackFromBottom); 816 817 boolean scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, true); 818 setScrollingCacheEnabled(scrollingCacheEnabled); 819 820 boolean useTextFilter = a.getBoolean(R.styleable.AbsListView_textFilterEnabled, false); 821 setTextFilterEnabled(useTextFilter); 822 823 int transcriptMode = a.getInt(R.styleable.AbsListView_transcriptMode, 824 TRANSCRIPT_MODE_DISABLED); 825 setTranscriptMode(transcriptMode); 826 827 int color = a.getColor(R.styleable.AbsListView_cacheColorHint, 0); 828 setCacheColorHint(color); 829 830 boolean enableFastScroll = a.getBoolean(R.styleable.AbsListView_fastScrollEnabled, false); 831 setFastScrollEnabled(enableFastScroll); 832 833 int fastScrollStyle = a.getResourceId(R.styleable.AbsListView_fastScrollStyle, 0); 834 setFastScrollStyle(fastScrollStyle); 835 836 boolean smoothScrollbar = a.getBoolean(R.styleable.AbsListView_smoothScrollbar, true); 837 setSmoothScrollbarEnabled(smoothScrollbar); 838 839 setChoiceMode(a.getInt(R.styleable.AbsListView_choiceMode, CHOICE_MODE_NONE)); 840 setFastScrollAlwaysVisible( 841 a.getBoolean(R.styleable.AbsListView_fastScrollAlwaysVisible, false)); 842 843 a.recycle(); 844 } 845 846 private void initAbsListView() { 847 // Setting focusable in touch mode will set the focusable property to true 848 setClickable(true); 849 setFocusableInTouchMode(true); 850 setWillNotDraw(false); 851 setAlwaysDrawnWithCacheEnabled(false); 852 setScrollingCacheEnabled(true); 853 854 final ViewConfiguration configuration = ViewConfiguration.get(mContext); 855 mTouchSlop = configuration.getScaledTouchSlop(); 856 mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 857 mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 858 mOverscrollDistance = configuration.getScaledOverscrollDistance(); 859 mOverflingDistance = configuration.getScaledOverflingDistance(); 860 861 mDensityScale = getContext().getResources().getDisplayMetrics().density; 862 } 863 864 @Override 865 public void setOverScrollMode(int mode) { 866 if (mode != OVER_SCROLL_NEVER) { 867 if (mEdgeGlowTop == null) { 868 Context context = getContext(); 869 mEdgeGlowTop = new EdgeEffect(context); 870 mEdgeGlowBottom = new EdgeEffect(context); 871 } 872 } else { 873 mEdgeGlowTop = null; 874 mEdgeGlowBottom = null; 875 } 876 super.setOverScrollMode(mode); 877 } 878 879 /** 880 * {@inheritDoc} 881 */ 882 @Override 883 public void setAdapter(ListAdapter adapter) { 884 if (adapter != null) { 885 mAdapterHasStableIds = mAdapter.hasStableIds(); 886 if (mChoiceMode != CHOICE_MODE_NONE && mAdapterHasStableIds && 887 mCheckedIdStates == null) { 888 mCheckedIdStates = new LongSparseArray<Integer>(); 889 } 890 } 891 892 if (mCheckStates != null) { 893 mCheckStates.clear(); 894 } 895 896 if (mCheckedIdStates != null) { 897 mCheckedIdStates.clear(); 898 } 899 } 900 901 /** 902 * Returns the number of items currently selected. This will only be valid 903 * if the choice mode is not {@link #CHOICE_MODE_NONE} (default). 904 * 905 * <p>To determine the specific items that are currently selected, use one of 906 * the <code>getChecked*</code> methods. 907 * 908 * @return The number of items currently selected 909 * 910 * @see #getCheckedItemPosition() 911 * @see #getCheckedItemPositions() 912 * @see #getCheckedItemIds() 913 */ 914 public int getCheckedItemCount() { 915 return mCheckedItemCount; 916 } 917 918 /** 919 * Returns the checked state of the specified position. The result is only 920 * valid if the choice mode has been set to {@link #CHOICE_MODE_SINGLE} 921 * or {@link #CHOICE_MODE_MULTIPLE}. 922 * 923 * @param position The item whose checked state to return 924 * @return The item's checked state or <code>false</code> if choice mode 925 * is invalid 926 * 927 * @see #setChoiceMode(int) 928 */ 929 public boolean isItemChecked(int position) { 930 if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { 931 return mCheckStates.get(position); 932 } 933 934 return false; 935 } 936 937 /** 938 * Returns the currently checked item. The result is only valid if the choice 939 * mode has been set to {@link #CHOICE_MODE_SINGLE}. 940 * 941 * @return The position of the currently checked item or 942 * {@link #INVALID_POSITION} if nothing is selected 943 * 944 * @see #setChoiceMode(int) 945 */ 946 public int getCheckedItemPosition() { 947 if (mChoiceMode == CHOICE_MODE_SINGLE && mCheckStates != null && mCheckStates.size() == 1) { 948 return mCheckStates.keyAt(0); 949 } 950 951 return INVALID_POSITION; 952 } 953 954 /** 955 * Returns the set of checked items in the list. The result is only valid if 956 * the choice mode has not been set to {@link #CHOICE_MODE_NONE}. 957 * 958 * @return A SparseBooleanArray which will return true for each call to 959 * get(int position) where position is a checked position in the 960 * list and false otherwise, or <code>null</code> if the choice 961 * mode is set to {@link #CHOICE_MODE_NONE}. 962 */ 963 public SparseBooleanArray getCheckedItemPositions() { 964 if (mChoiceMode != CHOICE_MODE_NONE) { 965 return mCheckStates; 966 } 967 return null; 968 } 969 970 /** 971 * Returns the set of checked items ids. The result is only valid if the 972 * choice mode has not been set to {@link #CHOICE_MODE_NONE} and the adapter 973 * has stable IDs. ({@link ListAdapter#hasStableIds()} == {@code true}) 974 * 975 * @return A new array which contains the id of each checked item in the 976 * list. 977 */ 978 public long[] getCheckedItemIds() { 979 if (mChoiceMode == CHOICE_MODE_NONE || mCheckedIdStates == null || mAdapter == null) { 980 return new long[0]; 981 } 982 983 final LongSparseArray<Integer> idStates = mCheckedIdStates; 984 final int count = idStates.size(); 985 final long[] ids = new long[count]; 986 987 for (int i = 0; i < count; i++) { 988 ids[i] = idStates.keyAt(i); 989 } 990 991 return ids; 992 } 993 994 /** 995 * Clear any choices previously set 996 */ 997 public void clearChoices() { 998 if (mCheckStates != null) { 999 mCheckStates.clear(); 1000 } 1001 if (mCheckedIdStates != null) { 1002 mCheckedIdStates.clear(); 1003 } 1004 mCheckedItemCount = 0; 1005 } 1006 1007 /** 1008 * Sets the checked state of the specified position. The is only valid if 1009 * the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or 1010 * {@link #CHOICE_MODE_MULTIPLE}. 1011 * 1012 * @param position The item whose checked state is to be checked 1013 * @param value The new checked state for the item 1014 */ 1015 public void setItemChecked(int position, boolean value) { 1016 if (mChoiceMode == CHOICE_MODE_NONE) { 1017 return; 1018 } 1019 1020 // Start selection mode if needed. We don't need to if we're unchecking something. 1021 if (value && mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode == null) { 1022 if (mMultiChoiceModeCallback == null || 1023 !mMultiChoiceModeCallback.hasWrappedCallback()) { 1024 throw new IllegalStateException("AbsListView: attempted to start selection mode " + 1025 "for CHOICE_MODE_MULTIPLE_MODAL but no choice mode callback was " + 1026 "supplied. Call setMultiChoiceModeListener to set a callback."); 1027 } 1028 mChoiceActionMode = startActionMode(mMultiChoiceModeCallback); 1029 } 1030 1031 if (mChoiceMode == CHOICE_MODE_MULTIPLE || mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { 1032 boolean oldValue = mCheckStates.get(position); 1033 mCheckStates.put(position, value); 1034 if (mCheckedIdStates != null && mAdapter.hasStableIds()) { 1035 if (value) { 1036 mCheckedIdStates.put(mAdapter.getItemId(position), position); 1037 } else { 1038 mCheckedIdStates.delete(mAdapter.getItemId(position)); 1039 } 1040 } 1041 if (oldValue != value) { 1042 if (value) { 1043 mCheckedItemCount++; 1044 } else { 1045 mCheckedItemCount--; 1046 } 1047 } 1048 if (mChoiceActionMode != null) { 1049 final long id = mAdapter.getItemId(position); 1050 mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, 1051 position, id, value); 1052 } 1053 } else { 1054 boolean updateIds = mCheckedIdStates != null && mAdapter.hasStableIds(); 1055 // Clear all values if we're checking something, or unchecking the currently 1056 // selected item 1057 if (value || isItemChecked(position)) { 1058 mCheckStates.clear(); 1059 if (updateIds) { 1060 mCheckedIdStates.clear(); 1061 } 1062 } 1063 // this may end up selecting the value we just cleared but this way 1064 // we ensure length of mCheckStates is 1, a fact getCheckedItemPosition relies on 1065 if (value) { 1066 mCheckStates.put(position, true); 1067 if (updateIds) { 1068 mCheckedIdStates.put(mAdapter.getItemId(position), position); 1069 } 1070 mCheckedItemCount = 1; 1071 } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) { 1072 mCheckedItemCount = 0; 1073 } 1074 } 1075 1076 // Do not generate a data change while we are in the layout phase 1077 if (!mInLayout && !mBlockLayoutRequests) { 1078 mDataChanged = true; 1079 rememberSyncState(); 1080 requestLayout(); 1081 } 1082 } 1083 1084 @Override 1085 public boolean performItemClick(View view, int position, long id) { 1086 boolean handled = false; 1087 boolean dispatchItemClick = true; 1088 1089 if (mChoiceMode != CHOICE_MODE_NONE) { 1090 handled = true; 1091 boolean checkedStateChanged = false; 1092 1093 if (mChoiceMode == CHOICE_MODE_MULTIPLE || 1094 (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode != null)) { 1095 boolean checked = !mCheckStates.get(position, false); 1096 mCheckStates.put(position, checked); 1097 if (mCheckedIdStates != null && mAdapter.hasStableIds()) { 1098 if (checked) { 1099 mCheckedIdStates.put(mAdapter.getItemId(position), position); 1100 } else { 1101 mCheckedIdStates.delete(mAdapter.getItemId(position)); 1102 } 1103 } 1104 if (checked) { 1105 mCheckedItemCount++; 1106 } else { 1107 mCheckedItemCount--; 1108 } 1109 if (mChoiceActionMode != null) { 1110 mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, 1111 position, id, checked); 1112 dispatchItemClick = false; 1113 } 1114 checkedStateChanged = true; 1115 } else if (mChoiceMode == CHOICE_MODE_SINGLE) { 1116 boolean checked = !mCheckStates.get(position, false); 1117 if (checked) { 1118 mCheckStates.clear(); 1119 mCheckStates.put(position, true); 1120 if (mCheckedIdStates != null && mAdapter.hasStableIds()) { 1121 mCheckedIdStates.clear(); 1122 mCheckedIdStates.put(mAdapter.getItemId(position), position); 1123 } 1124 mCheckedItemCount = 1; 1125 } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) { 1126 mCheckedItemCount = 0; 1127 } 1128 checkedStateChanged = true; 1129 } 1130 1131 if (checkedStateChanged) { 1132 updateOnScreenCheckedViews(); 1133 } 1134 } 1135 1136 if (dispatchItemClick) { 1137 handled |= super.performItemClick(view, position, id); 1138 } 1139 1140 return handled; 1141 } 1142 1143 /** 1144 * Perform a quick, in-place update of the checked or activated state 1145 * on all visible item views. This should only be called when a valid 1146 * choice mode is active. 1147 */ 1148 private void updateOnScreenCheckedViews() { 1149 final int firstPos = mFirstPosition; 1150 final int count = getChildCount(); 1151 final boolean useActivated = getContext().getApplicationInfo().targetSdkVersion 1152 >= android.os.Build.VERSION_CODES.HONEYCOMB; 1153 for (int i = 0; i < count; i++) { 1154 final View child = getChildAt(i); 1155 final int position = firstPos + i; 1156 1157 if (child instanceof Checkable) { 1158 ((Checkable) child).setChecked(mCheckStates.get(position)); 1159 } else if (useActivated) { 1160 child.setActivated(mCheckStates.get(position)); 1161 } 1162 } 1163 } 1164 1165 /** 1166 * @see #setChoiceMode(int) 1167 * 1168 * @return The current choice mode 1169 */ 1170 public int getChoiceMode() { 1171 return mChoiceMode; 1172 } 1173 1174 /** 1175 * Defines the choice behavior for the List. By default, Lists do not have any choice behavior 1176 * ({@link #CHOICE_MODE_NONE}). By setting the choiceMode to {@link #CHOICE_MODE_SINGLE}, the 1177 * List allows up to one item to be in a chosen state. By setting the choiceMode to 1178 * {@link #CHOICE_MODE_MULTIPLE}, the list allows any number of items to be chosen. 1179 * 1180 * @param choiceMode One of {@link #CHOICE_MODE_NONE}, {@link #CHOICE_MODE_SINGLE}, or 1181 * {@link #CHOICE_MODE_MULTIPLE} 1182 */ 1183 public void setChoiceMode(int choiceMode) { 1184 mChoiceMode = choiceMode; 1185 if (mChoiceActionMode != null) { 1186 mChoiceActionMode.finish(); 1187 mChoiceActionMode = null; 1188 } 1189 if (mChoiceMode != CHOICE_MODE_NONE) { 1190 if (mCheckStates == null) { 1191 mCheckStates = new SparseBooleanArray(0); 1192 } 1193 if (mCheckedIdStates == null && mAdapter != null && mAdapter.hasStableIds()) { 1194 mCheckedIdStates = new LongSparseArray<Integer>(0); 1195 } 1196 // Modal multi-choice mode only has choices when the mode is active. Clear them. 1197 if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { 1198 clearChoices(); 1199 setLongClickable(true); 1200 } 1201 } 1202 } 1203 1204 /** 1205 * Set a {@link MultiChoiceModeListener} that will manage the lifecycle of the 1206 * selection {@link ActionMode}. Only used when the choice mode is set to 1207 * {@link #CHOICE_MODE_MULTIPLE_MODAL}. 1208 * 1209 * @param listener Listener that will manage the selection mode 1210 * 1211 * @see #setChoiceMode(int) 1212 */ 1213 public void setMultiChoiceModeListener(MultiChoiceModeListener listener) { 1214 if (mMultiChoiceModeCallback == null) { 1215 mMultiChoiceModeCallback = new MultiChoiceModeWrapper(); 1216 } 1217 mMultiChoiceModeCallback.setWrapped(listener); 1218 } 1219 1220 /** 1221 * @return true if all list content currently fits within the view boundaries 1222 */ 1223 private boolean contentFits() { 1224 final int childCount = getChildCount(); 1225 if (childCount == 0) return true; 1226 if (childCount != mItemCount) return false; 1227 1228 return getChildAt(0).getTop() >= mListPadding.top && 1229 getChildAt(childCount - 1).getBottom() <= getHeight() - mListPadding.bottom; 1230 } 1231 1232 /** 1233 * Specifies whether fast scrolling is enabled or disabled. 1234 * <p> 1235 * When fast scrolling is enabled, the user can quickly scroll through lists 1236 * by dragging the fast scroll thumb. 1237 * <p> 1238 * If the adapter backing this list implements {@link SectionIndexer}, the 1239 * fast scroller will display section header previews as the user scrolls. 1240 * Additionally, the user will be able to quickly jump between sections by 1241 * tapping along the length of the scroll bar. 1242 * 1243 * @see SectionIndexer 1244 * @see #isFastScrollEnabled() 1245 * @param enabled true to enable fast scrolling, false otherwise 1246 */ 1247 public void setFastScrollEnabled(final boolean enabled) { 1248 if (mFastScrollEnabled != enabled) { 1249 mFastScrollEnabled = enabled; 1250 1251 if (isOwnerThread()) { 1252 setFastScrollerEnabledUiThread(enabled); 1253 } else { 1254 post(new Runnable() { 1255 @Override 1256 public void run() { 1257 setFastScrollerEnabledUiThread(enabled); 1258 } 1259 }); 1260 } 1261 } 1262 } 1263 1264 private void setFastScrollerEnabledUiThread(boolean enabled) { 1265 if (mFastScroll != null) { 1266 mFastScroll.setEnabled(enabled); 1267 } else if (enabled) { 1268 mFastScroll = new FastScroller(this, mFastScrollStyle); 1269 mFastScroll.setEnabled(true); 1270 } 1271 1272 resolvePadding(); 1273 1274 if (mFastScroll != null) { 1275 mFastScroll.updateLayout(); 1276 } 1277 } 1278 1279 /** 1280 * Specifies the style of the fast scroller decorations. 1281 * 1282 * @param styleResId style resource containing fast scroller properties 1283 * @see android.R.styleable#FastScroll 1284 */ 1285 public void setFastScrollStyle(int styleResId) { 1286 if (mFastScroll == null) { 1287 mFastScrollStyle = styleResId; 1288 } else { 1289 mFastScroll.setStyle(styleResId); 1290 } 1291 } 1292 1293 /** 1294 * Set whether or not the fast scroller should always be shown in place of 1295 * the standard scroll bars. This will enable fast scrolling if it is not 1296 * already enabled. 1297 * <p> 1298 * Fast scrollers shown in this way will not fade out and will be a 1299 * permanent fixture within the list. This is best combined with an inset 1300 * scroll bar style to ensure the scroll bar does not overlap content. 1301 * 1302 * @param alwaysShow true if the fast scroller should always be displayed, 1303 * false otherwise 1304 * @see #setScrollBarStyle(int) 1305 * @see #setFastScrollEnabled(boolean) 1306 */ 1307 public void setFastScrollAlwaysVisible(final boolean alwaysShow) { 1308 if (mFastScrollAlwaysVisible != alwaysShow) { 1309 if (alwaysShow && !mFastScrollEnabled) { 1310 setFastScrollEnabled(true); 1311 } 1312 1313 mFastScrollAlwaysVisible = alwaysShow; 1314 1315 if (isOwnerThread()) { 1316 setFastScrollerAlwaysVisibleUiThread(alwaysShow); 1317 } else { 1318 post(new Runnable() { 1319 @Override 1320 public void run() { 1321 setFastScrollerAlwaysVisibleUiThread(alwaysShow); 1322 } 1323 }); 1324 } 1325 } 1326 } 1327 1328 private void setFastScrollerAlwaysVisibleUiThread(boolean alwaysShow) { 1329 if (mFastScroll != null) { 1330 mFastScroll.setAlwaysShow(alwaysShow); 1331 } 1332 } 1333 1334 /** 1335 * @return whether the current thread is the one that created the view 1336 */ 1337 private boolean isOwnerThread() { 1338 return mOwnerThread == Thread.currentThread(); 1339 } 1340 1341 /** 1342 * Returns true if the fast scroller is set to always show on this view. 1343 * 1344 * @return true if the fast scroller will always show 1345 * @see #setFastScrollAlwaysVisible(boolean) 1346 */ 1347 public boolean isFastScrollAlwaysVisible() { 1348 if (mFastScroll == null) { 1349 return mFastScrollEnabled && mFastScrollAlwaysVisible; 1350 } else { 1351 return mFastScroll.isEnabled() && mFastScroll.isAlwaysShowEnabled(); 1352 } 1353 } 1354 1355 @Override 1356 public int getVerticalScrollbarWidth() { 1357 if (mFastScroll != null && mFastScroll.isEnabled()) { 1358 return Math.max(super.getVerticalScrollbarWidth(), mFastScroll.getWidth()); 1359 } 1360 return super.getVerticalScrollbarWidth(); 1361 } 1362 1363 /** 1364 * Returns true if the fast scroller is enabled. 1365 * 1366 * @see #setFastScrollEnabled(boolean) 1367 * @return true if fast scroll is enabled, false otherwise 1368 */ 1369 @ViewDebug.ExportedProperty 1370 public boolean isFastScrollEnabled() { 1371 if (mFastScroll == null) { 1372 return mFastScrollEnabled; 1373 } else { 1374 return mFastScroll.isEnabled(); 1375 } 1376 } 1377 1378 @Override 1379 public void setVerticalScrollbarPosition(int position) { 1380 super.setVerticalScrollbarPosition(position); 1381 if (mFastScroll != null) { 1382 mFastScroll.setScrollbarPosition(position); 1383 } 1384 } 1385 1386 @Override 1387 public void setScrollBarStyle(int style) { 1388 super.setScrollBarStyle(style); 1389 if (mFastScroll != null) { 1390 mFastScroll.setScrollBarStyle(style); 1391 } 1392 } 1393 1394 /** 1395 * If fast scroll is enabled, then don't draw the vertical scrollbar. 1396 * @hide 1397 */ 1398 @Override 1399 protected boolean isVerticalScrollBarHidden() { 1400 return isFastScrollEnabled(); 1401 } 1402 1403 /** 1404 * When smooth scrollbar is enabled, the position and size of the scrollbar thumb 1405 * is computed based on the number of visible pixels in the visible items. This 1406 * however assumes that all list items have the same height. If you use a list in 1407 * which items have different heights, the scrollbar will change appearance as the 1408 * user scrolls through the list. To avoid this issue, you need to disable this 1409 * property. 1410 * 1411 * When smooth scrollbar is disabled, the position and size of the scrollbar thumb 1412 * is based solely on the number of items in the adapter and the position of the 1413 * visible items inside the adapter. This provides a stable scrollbar as the user 1414 * navigates through a list of items with varying heights. 1415 * 1416 * @param enabled Whether or not to enable smooth scrollbar. 1417 * 1418 * @see #setSmoothScrollbarEnabled(boolean) 1419 * @attr ref android.R.styleable#AbsListView_smoothScrollbar 1420 */ 1421 public void setSmoothScrollbarEnabled(boolean enabled) { 1422 mSmoothScrollbarEnabled = enabled; 1423 } 1424 1425 /** 1426 * Returns the current state of the fast scroll feature. 1427 * 1428 * @return True if smooth scrollbar is enabled is enabled, false otherwise. 1429 * 1430 * @see #setSmoothScrollbarEnabled(boolean) 1431 */ 1432 @ViewDebug.ExportedProperty 1433 public boolean isSmoothScrollbarEnabled() { 1434 return mSmoothScrollbarEnabled; 1435 } 1436 1437 /** 1438 * Set the listener that will receive notifications every time the list scrolls. 1439 * 1440 * @param l the scroll listener 1441 */ 1442 public void setOnScrollListener(OnScrollListener l) { 1443 mOnScrollListener = l; 1444 invokeOnItemScrollListener(); 1445 } 1446 1447 /** 1448 * Notify our scroll listener (if there is one) of a change in scroll state 1449 */ 1450 void invokeOnItemScrollListener() { 1451 if (mFastScroll != null) { 1452 mFastScroll.onScroll(mFirstPosition, getChildCount(), mItemCount); 1453 } 1454 if (mOnScrollListener != null) { 1455 mOnScrollListener.onScroll(this, mFirstPosition, getChildCount(), mItemCount); 1456 } 1457 onScrollChanged(0, 0, 0, 0); // dummy values, View's implementation does not use these. 1458 } 1459 1460 @Override 1461 public void sendAccessibilityEvent(int eventType) { 1462 // Since this class calls onScrollChanged even if the mFirstPosition and the 1463 // child count have not changed we will avoid sending duplicate accessibility 1464 // events. 1465 if (eventType == AccessibilityEvent.TYPE_VIEW_SCROLLED) { 1466 final int firstVisiblePosition = getFirstVisiblePosition(); 1467 final int lastVisiblePosition = getLastVisiblePosition(); 1468 if (mLastAccessibilityScrollEventFromIndex == firstVisiblePosition 1469 && mLastAccessibilityScrollEventToIndex == lastVisiblePosition) { 1470 return; 1471 } else { 1472 mLastAccessibilityScrollEventFromIndex = firstVisiblePosition; 1473 mLastAccessibilityScrollEventToIndex = lastVisiblePosition; 1474 } 1475 } 1476 super.sendAccessibilityEvent(eventType); 1477 } 1478 1479 @Override 1480 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 1481 super.onInitializeAccessibilityEvent(event); 1482 event.setClassName(AbsListView.class.getName()); 1483 } 1484 1485 @Override 1486 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 1487 super.onInitializeAccessibilityNodeInfo(info); 1488 info.setClassName(AbsListView.class.getName()); 1489 if (isEnabled()) { 1490 if (getFirstVisiblePosition() > 0) { 1491 info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); 1492 info.setScrollable(true); 1493 } 1494 if (getLastVisiblePosition() < getCount() - 1) { 1495 info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); 1496 info.setScrollable(true); 1497 } 1498 } 1499 } 1500 1501 int getSelectionModeForAccessibility() { 1502 final int choiceMode = getChoiceMode(); 1503 switch (choiceMode) { 1504 case CHOICE_MODE_NONE: 1505 return CollectionInfo.SELECTION_MODE_NONE; 1506 case CHOICE_MODE_SINGLE: 1507 return CollectionInfo.SELECTION_MODE_SINGLE; 1508 case CHOICE_MODE_MULTIPLE: 1509 case CHOICE_MODE_MULTIPLE_MODAL: 1510 return CollectionInfo.SELECTION_MODE_MULTIPLE; 1511 default: 1512 return CollectionInfo.SELECTION_MODE_NONE; 1513 } 1514 } 1515 1516 @Override 1517 public boolean performAccessibilityAction(int action, Bundle arguments) { 1518 if (super.performAccessibilityAction(action, arguments)) { 1519 return true; 1520 } 1521 switch (action) { 1522 case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { 1523 if (isEnabled() && getLastVisiblePosition() < getCount() - 1) { 1524 final int viewportHeight = getHeight() - mListPadding.top - mListPadding.bottom; 1525 smoothScrollBy(viewportHeight, PositionScroller.SCROLL_DURATION); 1526 return true; 1527 } 1528 } return false; 1529 case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { 1530 if (isEnabled() && mFirstPosition > 0) { 1531 final int viewportHeight = getHeight() - mListPadding.top - mListPadding.bottom; 1532 smoothScrollBy(-viewportHeight, PositionScroller.SCROLL_DURATION); 1533 return true; 1534 } 1535 } return false; 1536 } 1537 return false; 1538 } 1539 1540 /** @hide */ 1541 @Override 1542 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1543 if (accessibilityId == getAccessibilityViewId()) { 1544 return this; 1545 } 1546 // If the data changed the children are invalid since the data model changed. 1547 // Hence, we pretend they do not exist. After a layout the children will sync 1548 // with the model at which point we notify that the accessibility state changed, 1549 // so a service will be able to re-fetch the views. 1550 if (mDataChanged) { 1551 return null; 1552 } 1553 return super.findViewByAccessibilityIdTraversal(accessibilityId); 1554 } 1555 1556 /** 1557 * Indicates whether the children's drawing cache is used during a scroll. 1558 * By default, the drawing cache is enabled but this will consume more memory. 1559 * 1560 * @return true if the scrolling cache is enabled, false otherwise 1561 * 1562 * @see #setScrollingCacheEnabled(boolean) 1563 * @see View#setDrawingCacheEnabled(boolean) 1564 */ 1565 @ViewDebug.ExportedProperty 1566 public boolean isScrollingCacheEnabled() { 1567 return mScrollingCacheEnabled; 1568 } 1569 1570 /** 1571 * Enables or disables the children's drawing cache during a scroll. 1572 * By default, the drawing cache is enabled but this will use more memory. 1573 * 1574 * When the scrolling cache is enabled, the caches are kept after the 1575 * first scrolling. You can manually clear the cache by calling 1576 * {@link android.view.ViewGroup#setChildrenDrawingCacheEnabled(boolean)}. 1577 * 1578 * @param enabled true to enable the scroll cache, false otherwise 1579 * 1580 * @see #isScrollingCacheEnabled() 1581 * @see View#setDrawingCacheEnabled(boolean) 1582 */ 1583 public void setScrollingCacheEnabled(boolean enabled) { 1584 if (mScrollingCacheEnabled && !enabled) { 1585 clearScrollingCache(); 1586 } 1587 mScrollingCacheEnabled = enabled; 1588 } 1589 1590 /** 1591 * Enables or disables the type filter window. If enabled, typing when 1592 * this view has focus will filter the children to match the users input. 1593 * Note that the {@link Adapter} used by this view must implement the 1594 * {@link Filterable} interface. 1595 * 1596 * @param textFilterEnabled true to enable type filtering, false otherwise 1597 * 1598 * @see Filterable 1599 */ 1600 public void setTextFilterEnabled(boolean textFilterEnabled) { 1601 mTextFilterEnabled = textFilterEnabled; 1602 } 1603 1604 /** 1605 * Indicates whether type filtering is enabled for this view 1606 * 1607 * @return true if type filtering is enabled, false otherwise 1608 * 1609 * @see #setTextFilterEnabled(boolean) 1610 * @see Filterable 1611 */ 1612 @ViewDebug.ExportedProperty 1613 public boolean isTextFilterEnabled() { 1614 return mTextFilterEnabled; 1615 } 1616 1617 @Override 1618 public void getFocusedRect(Rect r) { 1619 View view = getSelectedView(); 1620 if (view != null && view.getParent() == this) { 1621 // the focused rectangle of the selected view offset into the 1622 // coordinate space of this view. 1623 view.getFocusedRect(r); 1624 offsetDescendantRectToMyCoords(view, r); 1625 } else { 1626 // otherwise, just the norm 1627 super.getFocusedRect(r); 1628 } 1629 } 1630 1631 private void useDefaultSelector() { 1632 setSelector(getContext().getDrawable( 1633 com.android.internal.R.drawable.list_selector_background)); 1634 } 1635 1636 /** 1637 * Indicates whether the content of this view is pinned to, or stacked from, 1638 * the bottom edge. 1639 * 1640 * @return true if the content is stacked from the bottom edge, false otherwise 1641 */ 1642 @ViewDebug.ExportedProperty 1643 public boolean isStackFromBottom() { 1644 return mStackFromBottom; 1645 } 1646 1647 /** 1648 * When stack from bottom is set to true, the list fills its content starting from 1649 * the bottom of the view. 1650 * 1651 * @param stackFromBottom true to pin the view's content to the bottom edge, 1652 * false to pin the view's content to the top edge 1653 */ 1654 public void setStackFromBottom(boolean stackFromBottom) { 1655 if (mStackFromBottom != stackFromBottom) { 1656 mStackFromBottom = stackFromBottom; 1657 requestLayoutIfNecessary(); 1658 } 1659 } 1660 1661 void requestLayoutIfNecessary() { 1662 if (getChildCount() > 0) { 1663 resetList(); 1664 requestLayout(); 1665 invalidate(); 1666 } 1667 } 1668 1669 static class SavedState extends BaseSavedState { 1670 long selectedId; 1671 long firstId; 1672 int viewTop; 1673 int position; 1674 int height; 1675 String filter; 1676 boolean inActionMode; 1677 int checkedItemCount; 1678 SparseBooleanArray checkState; 1679 LongSparseArray<Integer> checkIdState; 1680 1681 /** 1682 * Constructor called from {@link AbsListView#onSaveInstanceState()} 1683 */ 1684 SavedState(Parcelable superState) { 1685 super(superState); 1686 } 1687 1688 /** 1689 * Constructor called from {@link #CREATOR} 1690 */ 1691 private SavedState(Parcel in) { 1692 super(in); 1693 selectedId = in.readLong(); 1694 firstId = in.readLong(); 1695 viewTop = in.readInt(); 1696 position = in.readInt(); 1697 height = in.readInt(); 1698 filter = in.readString(); 1699 inActionMode = in.readByte() != 0; 1700 checkedItemCount = in.readInt(); 1701 checkState = in.readSparseBooleanArray(); 1702 final int N = in.readInt(); 1703 if (N > 0) { 1704 checkIdState = new LongSparseArray<Integer>(); 1705 for (int i=0; i<N; i++) { 1706 final long key = in.readLong(); 1707 final int value = in.readInt(); 1708 checkIdState.put(key, value); 1709 } 1710 } 1711 } 1712 1713 @Override 1714 public void writeToParcel(Parcel out, int flags) { 1715 super.writeToParcel(out, flags); 1716 out.writeLong(selectedId); 1717 out.writeLong(firstId); 1718 out.writeInt(viewTop); 1719 out.writeInt(position); 1720 out.writeInt(height); 1721 out.writeString(filter); 1722 out.writeByte((byte) (inActionMode ? 1 : 0)); 1723 out.writeInt(checkedItemCount); 1724 out.writeSparseBooleanArray(checkState); 1725 final int N = checkIdState != null ? checkIdState.size() : 0; 1726 out.writeInt(N); 1727 for (int i=0; i<N; i++) { 1728 out.writeLong(checkIdState.keyAt(i)); 1729 out.writeInt(checkIdState.valueAt(i)); 1730 } 1731 } 1732 1733 @Override 1734 public String toString() { 1735 return "AbsListView.SavedState{" 1736 + Integer.toHexString(System.identityHashCode(this)) 1737 + " selectedId=" + selectedId 1738 + " firstId=" + firstId 1739 + " viewTop=" + viewTop 1740 + " position=" + position 1741 + " height=" + height 1742 + " filter=" + filter 1743 + " checkState=" + checkState + "}"; 1744 } 1745 1746 public static final Parcelable.Creator<SavedState> CREATOR 1747 = new Parcelable.Creator<SavedState>() { 1748 @Override 1749 public SavedState createFromParcel(Parcel in) { 1750 return new SavedState(in); 1751 } 1752 1753 @Override 1754 public SavedState[] newArray(int size) { 1755 return new SavedState[size]; 1756 } 1757 }; 1758 } 1759 1760 @Override 1761 public Parcelable onSaveInstanceState() { 1762 /* 1763 * This doesn't really make sense as the place to dismiss the 1764 * popups, but there don't seem to be any other useful hooks 1765 * that happen early enough to keep from getting complaints 1766 * about having leaked the window. 1767 */ 1768 dismissPopup(); 1769 1770 Parcelable superState = super.onSaveInstanceState(); 1771 1772 SavedState ss = new SavedState(superState); 1773 1774 if (mPendingSync != null) { 1775 // Just keep what we last restored. 1776 ss.selectedId = mPendingSync.selectedId; 1777 ss.firstId = mPendingSync.firstId; 1778 ss.viewTop = mPendingSync.viewTop; 1779 ss.position = mPendingSync.position; 1780 ss.height = mPendingSync.height; 1781 ss.filter = mPendingSync.filter; 1782 ss.inActionMode = mPendingSync.inActionMode; 1783 ss.checkedItemCount = mPendingSync.checkedItemCount; 1784 ss.checkState = mPendingSync.checkState; 1785 ss.checkIdState = mPendingSync.checkIdState; 1786 return ss; 1787 } 1788 1789 boolean haveChildren = getChildCount() > 0 && mItemCount > 0; 1790 long selectedId = getSelectedItemId(); 1791 ss.selectedId = selectedId; 1792 ss.height = getHeight(); 1793 1794 if (selectedId >= 0) { 1795 // Remember the selection 1796 ss.viewTop = mSelectedTop; 1797 ss.position = getSelectedItemPosition(); 1798 ss.firstId = INVALID_POSITION; 1799 } else { 1800 if (haveChildren && mFirstPosition > 0) { 1801 // Remember the position of the first child. 1802 // We only do this if we are not currently at the top of 1803 // the list, for two reasons: 1804 // (1) The list may be in the process of becoming empty, in 1805 // which case mItemCount may not be 0, but if we try to 1806 // ask for any information about position 0 we will crash. 1807 // (2) Being "at the top" seems like a special case, anyway, 1808 // and the user wouldn't expect to end up somewhere else when 1809 // they revisit the list even if its content has changed. 1810 View v = getChildAt(0); 1811 ss.viewTop = v.getTop(); 1812 int firstPos = mFirstPosition; 1813 if (firstPos >= mItemCount) { 1814 firstPos = mItemCount - 1; 1815 } 1816 ss.position = firstPos; 1817 ss.firstId = mAdapter.getItemId(firstPos); 1818 } else { 1819 ss.viewTop = 0; 1820 ss.firstId = INVALID_POSITION; 1821 ss.position = 0; 1822 } 1823 } 1824 1825 ss.filter = null; 1826 if (mFiltered) { 1827 final EditText textFilter = mTextFilter; 1828 if (textFilter != null) { 1829 Editable filterText = textFilter.getText(); 1830 if (filterText != null) { 1831 ss.filter = filterText.toString(); 1832 } 1833 } 1834 } 1835 1836 ss.inActionMode = mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode != null; 1837 1838 if (mCheckStates != null) { 1839 ss.checkState = mCheckStates.clone(); 1840 } 1841 if (mCheckedIdStates != null) { 1842 final LongSparseArray<Integer> idState = new LongSparseArray<Integer>(); 1843 final int count = mCheckedIdStates.size(); 1844 for (int i = 0; i < count; i++) { 1845 idState.put(mCheckedIdStates.keyAt(i), mCheckedIdStates.valueAt(i)); 1846 } 1847 ss.checkIdState = idState; 1848 } 1849 ss.checkedItemCount = mCheckedItemCount; 1850 1851 if (mRemoteAdapter != null) { 1852 mRemoteAdapter.saveRemoteViewsCache(); 1853 } 1854 1855 return ss; 1856 } 1857 1858 @Override 1859 public void onRestoreInstanceState(Parcelable state) { 1860 SavedState ss = (SavedState) state; 1861 1862 super.onRestoreInstanceState(ss.getSuperState()); 1863 mDataChanged = true; 1864 1865 mSyncHeight = ss.height; 1866 1867 if (ss.selectedId >= 0) { 1868 mNeedSync = true; 1869 mPendingSync = ss; 1870 mSyncRowId = ss.selectedId; 1871 mSyncPosition = ss.position; 1872 mSpecificTop = ss.viewTop; 1873 mSyncMode = SYNC_SELECTED_POSITION; 1874 } else if (ss.firstId >= 0) { 1875 setSelectedPositionInt(INVALID_POSITION); 1876 // Do this before setting mNeedSync since setNextSelectedPosition looks at mNeedSync 1877 setNextSelectedPositionInt(INVALID_POSITION); 1878 mSelectorPosition = INVALID_POSITION; 1879 mNeedSync = true; 1880 mPendingSync = ss; 1881 mSyncRowId = ss.firstId; 1882 mSyncPosition = ss.position; 1883 mSpecificTop = ss.viewTop; 1884 mSyncMode = SYNC_FIRST_POSITION; 1885 } 1886 1887 setFilterText(ss.filter); 1888 1889 if (ss.checkState != null) { 1890 mCheckStates = ss.checkState; 1891 } 1892 1893 if (ss.checkIdState != null) { 1894 mCheckedIdStates = ss.checkIdState; 1895 } 1896 1897 mCheckedItemCount = ss.checkedItemCount; 1898 1899 if (ss.inActionMode && mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && 1900 mMultiChoiceModeCallback != null) { 1901 mChoiceActionMode = startActionMode(mMultiChoiceModeCallback); 1902 } 1903 1904 requestLayout(); 1905 } 1906 1907 private boolean acceptFilter() { 1908 return mTextFilterEnabled && getAdapter() instanceof Filterable && 1909 ((Filterable) getAdapter()).getFilter() != null; 1910 } 1911 1912 /** 1913 * Sets the initial value for the text filter. 1914 * @param filterText The text to use for the filter. 1915 * 1916 * @see #setTextFilterEnabled 1917 */ 1918 public void setFilterText(String filterText) { 1919 // TODO: Should we check for acceptFilter()? 1920 if (mTextFilterEnabled && !TextUtils.isEmpty(filterText)) { 1921 createTextFilter(false); 1922 // This is going to call our listener onTextChanged, but we might not 1923 // be ready to bring up a window yet 1924 mTextFilter.setText(filterText); 1925 mTextFilter.setSelection(filterText.length()); 1926 if (mAdapter instanceof Filterable) { 1927 // if mPopup is non-null, then onTextChanged will do the filtering 1928 if (mPopup == null) { 1929 Filter f = ((Filterable) mAdapter).getFilter(); 1930 f.filter(filterText); 1931 } 1932 // Set filtered to true so we will display the filter window when our main 1933 // window is ready 1934 mFiltered = true; 1935 mDataSetObserver.clearSavedState(); 1936 } 1937 } 1938 } 1939 1940 /** 1941 * Returns the list's text filter, if available. 1942 * @return the list's text filter or null if filtering isn't enabled 1943 */ 1944 public CharSequence getTextFilter() { 1945 if (mTextFilterEnabled && mTextFilter != null) { 1946 return mTextFilter.getText(); 1947 } 1948 return null; 1949 } 1950 1951 @Override 1952 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 1953 super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); 1954 if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) { 1955 if (!isAttachedToWindow() && mAdapter != null) { 1956 // Data may have changed while we were detached and it's valid 1957 // to change focus while detached. Refresh so we don't die. 1958 mDataChanged = true; 1959 mOldItemCount = mItemCount; 1960 mItemCount = mAdapter.getCount(); 1961 } 1962 resurrectSelection(); 1963 } 1964 } 1965 1966 @Override 1967 public void requestLayout() { 1968 if (!mBlockLayoutRequests && !mInLayout) { 1969 super.requestLayout(); 1970 } 1971 } 1972 1973 /** 1974 * The list is empty. Clear everything out. 1975 */ 1976 void resetList() { 1977 removeAllViewsInLayout(); 1978 mFirstPosition = 0; 1979 mDataChanged = false; 1980 mPositionScrollAfterLayout = null; 1981 mNeedSync = false; 1982 mPendingSync = null; 1983 mOldSelectedPosition = INVALID_POSITION; 1984 mOldSelectedRowId = INVALID_ROW_ID; 1985 setSelectedPositionInt(INVALID_POSITION); 1986 setNextSelectedPositionInt(INVALID_POSITION); 1987 mSelectedTop = 0; 1988 mSelectorPosition = INVALID_POSITION; 1989 mSelectorRect.setEmpty(); 1990 invalidate(); 1991 } 1992 1993 @Override 1994 protected int computeVerticalScrollExtent() { 1995 final int count = getChildCount(); 1996 if (count > 0) { 1997 if (mSmoothScrollbarEnabled) { 1998 int extent = count * 100; 1999 2000 View view = getChildAt(0); 2001 final int top = view.getTop(); 2002 int height = view.getHeight(); 2003 if (height > 0) { 2004 extent += (top * 100) / height; 2005 } 2006 2007 view = getChildAt(count - 1); 2008 final int bottom = view.getBottom(); 2009 height = view.getHeight(); 2010 if (height > 0) { 2011 extent -= ((bottom - getHeight()) * 100) / height; 2012 } 2013 2014 return extent; 2015 } else { 2016 return 1; 2017 } 2018 } 2019 return 0; 2020 } 2021 2022 @Override 2023 protected int computeVerticalScrollOffset() { 2024 final int firstPosition = mFirstPosition; 2025 final int childCount = getChildCount(); 2026 if (firstPosition >= 0 && childCount > 0) { 2027 if (mSmoothScrollbarEnabled) { 2028 final View view = getChildAt(0); 2029 final int top = view.getTop(); 2030 int height = view.getHeight(); 2031 if (height > 0) { 2032 return Math.max(firstPosition * 100 - (top * 100) / height + 2033 (int)((float)mScrollY / getHeight() * mItemCount * 100), 0); 2034 } 2035 } else { 2036 int index; 2037 final int count = mItemCount; 2038 if (firstPosition == 0) { 2039 index = 0; 2040 } else if (firstPosition + childCount == count) { 2041 index = count; 2042 } else { 2043 index = firstPosition + childCount / 2; 2044 } 2045 return (int) (firstPosition + childCount * (index / (float) count)); 2046 } 2047 } 2048 return 0; 2049 } 2050 2051 @Override 2052 protected int computeVerticalScrollRange() { 2053 int result; 2054 if (mSmoothScrollbarEnabled) { 2055 result = Math.max(mItemCount * 100, 0); 2056 if (mScrollY != 0) { 2057 // Compensate for overscroll 2058 result += Math.abs((int) ((float) mScrollY / getHeight() * mItemCount * 100)); 2059 } 2060 } else { 2061 result = mItemCount; 2062 } 2063 return result; 2064 } 2065 2066 @Override 2067 protected float getTopFadingEdgeStrength() { 2068 final int count = getChildCount(); 2069 final float fadeEdge = super.getTopFadingEdgeStrength(); 2070 if (count == 0) { 2071 return fadeEdge; 2072 } else { 2073 if (mFirstPosition > 0) { 2074 return 1.0f; 2075 } 2076 2077 final int top = getChildAt(0).getTop(); 2078 final float fadeLength = getVerticalFadingEdgeLength(); 2079 return top < mPaddingTop ? -(top - mPaddingTop) / fadeLength : fadeEdge; 2080 } 2081 } 2082 2083 @Override 2084 protected float getBottomFadingEdgeStrength() { 2085 final int count = getChildCount(); 2086 final float fadeEdge = super.getBottomFadingEdgeStrength(); 2087 if (count == 0) { 2088 return fadeEdge; 2089 } else { 2090 if (mFirstPosition + count - 1 < mItemCount - 1) { 2091 return 1.0f; 2092 } 2093 2094 final int bottom = getChildAt(count - 1).getBottom(); 2095 final int height = getHeight(); 2096 final float fadeLength = getVerticalFadingEdgeLength(); 2097 return bottom > height - mPaddingBottom ? 2098 (bottom - height + mPaddingBottom) / fadeLength : fadeEdge; 2099 } 2100 } 2101 2102 @Override 2103 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2104 if (mSelector == null) { 2105 useDefaultSelector(); 2106 } 2107 final Rect listPadding = mListPadding; 2108 listPadding.left = mSelectionLeftPadding + mPaddingLeft; 2109 listPadding.top = mSelectionTopPadding + mPaddingTop; 2110 listPadding.right = mSelectionRightPadding + mPaddingRight; 2111 listPadding.bottom = mSelectionBottomPadding + mPaddingBottom; 2112 2113 // Check if our previous measured size was at a point where we should scroll later. 2114 if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) { 2115 final int childCount = getChildCount(); 2116 final int listBottom = getHeight() - getPaddingBottom(); 2117 final View lastChild = getChildAt(childCount - 1); 2118 final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom; 2119 mForceTranscriptScroll = mFirstPosition + childCount >= mLastHandledItemCount && 2120 lastBottom <= listBottom; 2121 } 2122 } 2123 2124 /** 2125 * Subclasses should NOT override this method but 2126 * {@link #layoutChildren()} instead. 2127 */ 2128 @Override 2129 protected void onLayout(boolean changed, int l, int t, int r, int b) { 2130 super.onLayout(changed, l, t, r, b); 2131 2132 mInLayout = true; 2133 2134 final int childCount = getChildCount(); 2135 if (changed) { 2136 for (int i = 0; i < childCount; i++) { 2137 getChildAt(i).forceLayout(); 2138 } 2139 mRecycler.markChildrenDirty(); 2140 } 2141 2142 layoutChildren(); 2143 mInLayout = false; 2144 2145 mOverscrollMax = (b - t) / OVERSCROLL_LIMIT_DIVISOR; 2146 2147 // TODO: Move somewhere sane. This doesn't belong in onLayout(). 2148 if (mFastScroll != null) { 2149 mFastScroll.onItemCountChanged(getChildCount(), mItemCount); 2150 } 2151 } 2152 2153 /** 2154 * @hide 2155 */ 2156 @Override 2157 protected boolean setFrame(int left, int top, int right, int bottom) { 2158 final boolean changed = super.setFrame(left, top, right, bottom); 2159 2160 if (changed) { 2161 // Reposition the popup when the frame has changed. This includes 2162 // translating the widget, not just changing its dimension. The 2163 // filter popup needs to follow the widget. 2164 final boolean visible = getWindowVisibility() == View.VISIBLE; 2165 if (mFiltered && visible && mPopup != null && mPopup.isShowing()) { 2166 positionPopup(); 2167 } 2168 } 2169 2170 return changed; 2171 } 2172 2173 /** 2174 * Subclasses must override this method to layout their children. 2175 */ 2176 protected void layoutChildren() { 2177 } 2178 2179 /** 2180 * @param focusedView view that holds accessibility focus 2181 * @return direct child that contains accessibility focus, or null if no 2182 * child contains accessibility focus 2183 */ 2184 View getAccessibilityFocusedChild(View focusedView) { 2185 ViewParent viewParent = focusedView.getParent(); 2186 while ((viewParent instanceof View) && (viewParent != this)) { 2187 focusedView = (View) viewParent; 2188 viewParent = viewParent.getParent(); 2189 } 2190 2191 if (!(viewParent instanceof View)) { 2192 return null; 2193 } 2194 2195 return focusedView; 2196 } 2197 2198 void updateScrollIndicators() { 2199 if (mScrollUp != null) { 2200 boolean canScrollUp; 2201 // 0th element is not visible 2202 canScrollUp = mFirstPosition > 0; 2203 2204 // ... Or top of 0th element is not visible 2205 if (!canScrollUp) { 2206 if (getChildCount() > 0) { 2207 View child = getChildAt(0); 2208 canScrollUp = child.getTop() < mListPadding.top; 2209 } 2210 } 2211 2212 mScrollUp.setVisibility(canScrollUp ? View.VISIBLE : View.INVISIBLE); 2213 } 2214 2215 if (mScrollDown != null) { 2216 boolean canScrollDown; 2217 int count = getChildCount(); 2218 2219 // Last item is not visible 2220 canScrollDown = (mFirstPosition + count) < mItemCount; 2221 2222 // ... Or bottom of the last element is not visible 2223 if (!canScrollDown && count > 0) { 2224 View child = getChildAt(count - 1); 2225 canScrollDown = child.getBottom() > mBottom - mListPadding.bottom; 2226 } 2227 2228 mScrollDown.setVisibility(canScrollDown ? View.VISIBLE : View.INVISIBLE); 2229 } 2230 } 2231 2232 @Override 2233 @ViewDebug.ExportedProperty 2234 public View getSelectedView() { 2235 if (mItemCount > 0 && mSelectedPosition >= 0) { 2236 return getChildAt(mSelectedPosition - mFirstPosition); 2237 } else { 2238 return null; 2239 } 2240 } 2241 2242 /** 2243 * List padding is the maximum of the normal view's padding and the padding of the selector. 2244 * 2245 * @see android.view.View#getPaddingTop() 2246 * @see #getSelector() 2247 * 2248 * @return The top list padding. 2249 */ 2250 public int getListPaddingTop() { 2251 return mListPadding.top; 2252 } 2253 2254 /** 2255 * List padding is the maximum of the normal view's padding and the padding of the selector. 2256 * 2257 * @see android.view.View#getPaddingBottom() 2258 * @see #getSelector() 2259 * 2260 * @return The bottom list padding. 2261 */ 2262 public int getListPaddingBottom() { 2263 return mListPadding.bottom; 2264 } 2265 2266 /** 2267 * List padding is the maximum of the normal view's padding and the padding of the selector. 2268 * 2269 * @see android.view.View#getPaddingLeft() 2270 * @see #getSelector() 2271 * 2272 * @return The left list padding. 2273 */ 2274 public int getListPaddingLeft() { 2275 return mListPadding.left; 2276 } 2277 2278 /** 2279 * List padding is the maximum of the normal view's padding and the padding of the selector. 2280 * 2281 * @see android.view.View#getPaddingRight() 2282 * @see #getSelector() 2283 * 2284 * @return The right list padding. 2285 */ 2286 public int getListPaddingRight() { 2287 return mListPadding.right; 2288 } 2289 2290 /** 2291 * Get a view and have it show the data associated with the specified 2292 * position. This is called when we have already discovered that the view is 2293 * not available for reuse in the recycle bin. The only choices left are 2294 * converting an old view or making a new one. 2295 * 2296 * @param position The position to display 2297 * @param isScrap Array of at least 1 boolean, the first entry will become true if 2298 * the returned view was taken from the scrap heap, false if otherwise. 2299 * 2300 * @return A view displaying the data associated with the specified position 2301 */ 2302 View obtainView(int position, boolean[] isScrap) { 2303 Trace.traceBegin(Trace.TRACE_TAG_VIEW, "obtainView"); 2304 2305 isScrap[0] = false; 2306 2307 // Check whether we have a transient state view. Attempt to re-bind the 2308 // data and discard the view if we fail. 2309 final View transientView = mRecycler.getTransientStateView(position); 2310 if (transientView != null) { 2311 final LayoutParams params = (LayoutParams) transientView.getLayoutParams(); 2312 2313 // If the view type hasn't changed, attempt to re-bind the data. 2314 if (params.viewType == mAdapter.getItemViewType(position)) { 2315 final View updatedView = mAdapter.getView(position, transientView, this); 2316 2317 // If we failed to re-bind the data, scrap the obtained view. 2318 if (updatedView != transientView) { 2319 setItemViewLayoutParams(updatedView, position); 2320 mRecycler.addScrapView(updatedView, position); 2321 } 2322 } 2323 2324 // Scrap view implies temporary detachment. 2325 isScrap[0] = true; 2326 return transientView; 2327 } 2328 2329 final View scrapView = mRecycler.getScrapView(position); 2330 final View child = mAdapter.getView(position, scrapView, this); 2331 if (scrapView != null) { 2332 if (child != scrapView) { 2333 // Failed to re-bind the data, return scrap to the heap. 2334 mRecycler.addScrapView(scrapView, position); 2335 } else { 2336 isScrap[0] = true; 2337 2338 child.dispatchFinishTemporaryDetach(); 2339 } 2340 } 2341 2342 if (mCacheColorHint != 0) { 2343 child.setDrawingCacheBackgroundColor(mCacheColorHint); 2344 } 2345 2346 if (child.getImportantForAccessibility() == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { 2347 child.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES); 2348 } 2349 2350 setItemViewLayoutParams(child, position); 2351 2352 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 2353 if (mAccessibilityDelegate == null) { 2354 mAccessibilityDelegate = new ListItemAccessibilityDelegate(); 2355 } 2356 if (child.getAccessibilityDelegate() == null) { 2357 child.setAccessibilityDelegate(mAccessibilityDelegate); 2358 } 2359 } 2360 2361 Trace.traceEnd(Trace.TRACE_TAG_VIEW); 2362 2363 return child; 2364 } 2365 2366 private void setItemViewLayoutParams(View child, int position) { 2367 final ViewGroup.LayoutParams vlp = child.getLayoutParams(); 2368 LayoutParams lp; 2369 if (vlp == null) { 2370 lp = (LayoutParams) generateDefaultLayoutParams(); 2371 } else if (!checkLayoutParams(vlp)) { 2372 lp = (LayoutParams) generateLayoutParams(vlp); 2373 } else { 2374 lp = (LayoutParams) vlp; 2375 } 2376 2377 if (mAdapterHasStableIds) { 2378 lp.itemId = mAdapter.getItemId(position); 2379 } 2380 lp.viewType = mAdapter.getItemViewType(position); 2381 child.setLayoutParams(lp); 2382 } 2383 2384 class ListItemAccessibilityDelegate extends AccessibilityDelegate { 2385 @Override 2386 public AccessibilityNodeInfo createAccessibilityNodeInfo(View host) { 2387 // If the data changed the children are invalid since the data model changed. 2388 // Hence, we pretend they do not exist. After a layout the children will sync 2389 // with the model at which point we notify that the accessibility state changed, 2390 // so a service will be able to re-fetch the views. 2391 if (mDataChanged) { 2392 return null; 2393 } 2394 return super.createAccessibilityNodeInfo(host); 2395 } 2396 2397 @Override 2398 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 2399 super.onInitializeAccessibilityNodeInfo(host, info); 2400 2401 final int position = getPositionForView(host); 2402 onInitializeAccessibilityNodeInfoForItem(host, position, info); 2403 } 2404 2405 @Override 2406 public boolean performAccessibilityAction(View host, int action, Bundle arguments) { 2407 if (super.performAccessibilityAction(host, action, arguments)) { 2408 return true; 2409 } 2410 2411 final int position = getPositionForView(host); 2412 final ListAdapter adapter = getAdapter(); 2413 2414 if ((position == INVALID_POSITION) || (adapter == null)) { 2415 // Cannot perform actions on invalid items. 2416 return false; 2417 } 2418 2419 if (!isEnabled() || !adapter.isEnabled(position)) { 2420 // Cannot perform actions on disabled items. 2421 return false; 2422 } 2423 2424 final long id = getItemIdAtPosition(position); 2425 2426 switch (action) { 2427 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 2428 if (getSelectedItemPosition() == position) { 2429 setSelection(INVALID_POSITION); 2430 return true; 2431 } 2432 } return false; 2433 case AccessibilityNodeInfo.ACTION_SELECT: { 2434 if (getSelectedItemPosition() != position) { 2435 setSelection(position); 2436 return true; 2437 } 2438 } return false; 2439 case AccessibilityNodeInfo.ACTION_CLICK: { 2440 if (isClickable()) { 2441 return performItemClick(host, position, id); 2442 } 2443 } return false; 2444 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 2445 if (isLongClickable()) { 2446 return performLongPress(host, position, id); 2447 } 2448 } return false; 2449 } 2450 2451 return false; 2452 } 2453 } 2454 2455 /** 2456 * Initializes an {@link AccessibilityNodeInfo} with information about a 2457 * particular item in the list. 2458 * 2459 * @param view View representing the list item. 2460 * @param position Position of the list item within the adapter. 2461 * @param info Node info to populate. 2462 */ 2463 public void onInitializeAccessibilityNodeInfoForItem( 2464 View view, int position, AccessibilityNodeInfo info) { 2465 final ListAdapter adapter = getAdapter(); 2466 if (position == INVALID_POSITION || adapter == null) { 2467 // The item doesn't exist, so there's not much we can do here. 2468 return; 2469 } 2470 2471 if (!isEnabled() || !adapter.isEnabled(position)) { 2472 info.setEnabled(false); 2473 return; 2474 } 2475 2476 if (position == getSelectedItemPosition()) { 2477 info.setSelected(true); 2478 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 2479 } else { 2480 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 2481 } 2482 2483 if (isClickable()) { 2484 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 2485 info.setClickable(true); 2486 } 2487 2488 if (isLongClickable()) { 2489 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 2490 info.setLongClickable(true); 2491 } 2492 } 2493 2494 /** 2495 * Positions the selector in a way that mimics touch. 2496 */ 2497 void positionSelectorLikeTouch(int position, View sel, float x, float y) { 2498 positionSelectorLikeFocus(position, sel); 2499 2500 if (mSelector != null && position != INVALID_POSITION) { 2501 mSelector.setHotspot(x, y); 2502 } 2503 } 2504 2505 /** 2506 * Positions the selector in a way that mimics keyboard focus. 2507 */ 2508 void positionSelectorLikeFocus(int position, View sel) { 2509 // If we're changing position, update the visibility since the selector 2510 // is technically being detached from the previous selection. 2511 final Drawable selector = mSelector; 2512 final boolean manageState = selector != null && mSelectorPosition != position 2513 && position != INVALID_POSITION; 2514 if (manageState) { 2515 selector.setVisible(false, false); 2516 } 2517 2518 positionSelector(position, sel); 2519 2520 if (manageState) { 2521 final Rect bounds = mSelectorRect; 2522 final float x = bounds.exactCenterX(); 2523 final float y = bounds.exactCenterY(); 2524 selector.setVisible(getVisibility() == VISIBLE, false); 2525 selector.setHotspot(x, y); 2526 } 2527 } 2528 2529 void positionSelector(int position, View sel) { 2530 if (position != INVALID_POSITION) { 2531 mSelectorPosition = position; 2532 } 2533 2534 final Rect selectorRect = mSelectorRect; 2535 selectorRect.set(sel.getLeft(), sel.getTop(), sel.getRight(), sel.getBottom()); 2536 if (sel instanceof SelectionBoundsAdjuster) { 2537 ((SelectionBoundsAdjuster)sel).adjustListItemSelectionBounds(selectorRect); 2538 } 2539 2540 // Adjust for selection padding. 2541 selectorRect.left -= mSelectionLeftPadding; 2542 selectorRect.top -= mSelectionTopPadding; 2543 selectorRect.right += mSelectionRightPadding; 2544 selectorRect.bottom += mSelectionBottomPadding; 2545 2546 // Update the selector drawable. 2547 final Drawable selector = mSelector; 2548 if (selector != null) { 2549 selector.setBounds(selectorRect); 2550 } 2551 2552 final boolean isChildViewEnabled = mIsChildViewEnabled; 2553 if (sel.isEnabled() != isChildViewEnabled) { 2554 mIsChildViewEnabled = !isChildViewEnabled; 2555 if (getSelectedItemPosition() != INVALID_POSITION) { 2556 refreshDrawableState(); 2557 } 2558 } 2559 } 2560 2561 @Override 2562 protected void dispatchDraw(Canvas canvas) { 2563 int saveCount = 0; 2564 final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2565 if (clipToPadding) { 2566 saveCount = canvas.save(); 2567 final int scrollX = mScrollX; 2568 final int scrollY = mScrollY; 2569 canvas.clipRect(scrollX + mPaddingLeft, scrollY + mPaddingTop, 2570 scrollX + mRight - mLeft - mPaddingRight, 2571 scrollY + mBottom - mTop - mPaddingBottom); 2572 mGroupFlags &= ~CLIP_TO_PADDING_MASK; 2573 } 2574 2575 final boolean drawSelectorOnTop = mDrawSelectorOnTop; 2576 if (!drawSelectorOnTop) { 2577 drawSelector(canvas); 2578 } 2579 2580 super.dispatchDraw(canvas); 2581 2582 if (drawSelectorOnTop) { 2583 drawSelector(canvas); 2584 } 2585 2586 if (clipToPadding) { 2587 canvas.restoreToCount(saveCount); 2588 mGroupFlags |= CLIP_TO_PADDING_MASK; 2589 } 2590 } 2591 2592 @Override 2593 protected boolean isPaddingOffsetRequired() { 2594 return (mGroupFlags & CLIP_TO_PADDING_MASK) != CLIP_TO_PADDING_MASK; 2595 } 2596 2597 @Override 2598 protected int getLeftPaddingOffset() { 2599 return (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK ? 0 : -mPaddingLeft; 2600 } 2601 2602 @Override 2603 protected int getTopPaddingOffset() { 2604 return (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK ? 0 : -mPaddingTop; 2605 } 2606 2607 @Override 2608 protected int getRightPaddingOffset() { 2609 return (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK ? 0 : mPaddingRight; 2610 } 2611 2612 @Override 2613 protected int getBottomPaddingOffset() { 2614 return (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK ? 0 : mPaddingBottom; 2615 } 2616 2617 @Override 2618 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 2619 if (getChildCount() > 0) { 2620 mDataChanged = true; 2621 rememberSyncState(); 2622 } 2623 2624 if (mFastScroll != null) { 2625 mFastScroll.onSizeChanged(w, h, oldw, oldh); 2626 } 2627 } 2628 2629 /** 2630 * @return True if the current touch mode requires that we draw the selector in the pressed 2631 * state. 2632 */ 2633 boolean touchModeDrawsInPressedState() { 2634 // FIXME use isPressed for this 2635 switch (mTouchMode) { 2636 case TOUCH_MODE_TAP: 2637 case TOUCH_MODE_DONE_WAITING: 2638 return true; 2639 default: 2640 return false; 2641 } 2642 } 2643 2644 /** 2645 * Indicates whether this view is in a state where the selector should be drawn. This will 2646 * happen if we have focus but are not in touch mode, or we are in the middle of displaying 2647 * the pressed state for an item. 2648 * 2649 * @return True if the selector should be shown 2650 */ 2651 boolean shouldShowSelector() { 2652 return (!isInTouchMode()) || (touchModeDrawsInPressedState() && isPressed()); 2653 } 2654 2655 private void drawSelector(Canvas canvas) { 2656 if (!mSelectorRect.isEmpty()) { 2657 final Drawable selector = mSelector; 2658 selector.setBounds(mSelectorRect); 2659 selector.draw(canvas); 2660 } 2661 } 2662 2663 /** 2664 * Controls whether the selection highlight drawable should be drawn on top of the item or 2665 * behind it. 2666 * 2667 * @param onTop If true, the selector will be drawn on the item it is highlighting. The default 2668 * is false. 2669 * 2670 * @attr ref android.R.styleable#AbsListView_drawSelectorOnTop 2671 */ 2672 public void setDrawSelectorOnTop(boolean onTop) { 2673 mDrawSelectorOnTop = onTop; 2674 } 2675 2676 /** 2677 * Set a Drawable that should be used to highlight the currently selected item. 2678 * 2679 * @param resID A Drawable resource to use as the selection highlight. 2680 * 2681 * @attr ref android.R.styleable#AbsListView_listSelector 2682 */ 2683 public void setSelector(int resID) { 2684 setSelector(getContext().getDrawable(resID)); 2685 } 2686 2687 public void setSelector(Drawable sel) { 2688 if (mSelector != null) { 2689 mSelector.setCallback(null); 2690 unscheduleDrawable(mSelector); 2691 } 2692 mSelector = sel; 2693 Rect padding = new Rect(); 2694 sel.getPadding(padding); 2695 mSelectionLeftPadding = padding.left; 2696 mSelectionTopPadding = padding.top; 2697 mSelectionRightPadding = padding.right; 2698 mSelectionBottomPadding = padding.bottom; 2699 sel.setCallback(this); 2700 updateSelectorState(); 2701 } 2702 2703 /** 2704 * Returns the selector {@link android.graphics.drawable.Drawable} that is used to draw the 2705 * selection in the list. 2706 * 2707 * @return the drawable used to display the selector 2708 */ 2709 public Drawable getSelector() { 2710 return mSelector; 2711 } 2712 2713 /** 2714 * Sets the selector state to "pressed" and posts a CheckForKeyLongPress to see if 2715 * this is a long press. 2716 */ 2717 void keyPressed() { 2718 if (!isEnabled() || !isClickable()) { 2719 return; 2720 } 2721 2722 Drawable selector = mSelector; 2723 Rect selectorRect = mSelectorRect; 2724 if (selector != null && (isFocused() || touchModeDrawsInPressedState()) 2725 && !selectorRect.isEmpty()) { 2726 2727 final View v = getChildAt(mSelectedPosition - mFirstPosition); 2728 2729 if (v != null) { 2730 if (v.hasFocusable()) return; 2731 v.setPressed(true); 2732 } 2733 setPressed(true); 2734 2735 final boolean longClickable = isLongClickable(); 2736 Drawable d = selector.getCurrent(); 2737 if (d != null && d instanceof TransitionDrawable) { 2738 if (longClickable) { 2739 ((TransitionDrawable) d).startTransition( 2740 ViewConfiguration.getLongPressTimeout()); 2741 } else { 2742 ((TransitionDrawable) d).resetTransition(); 2743 } 2744 } 2745 if (longClickable && !mDataChanged) { 2746 if (mPendingCheckForKeyLongPress == null) { 2747 mPendingCheckForKeyLongPress = new CheckForKeyLongPress(); 2748 } 2749 mPendingCheckForKeyLongPress.rememberWindowAttachCount(); 2750 postDelayed(mPendingCheckForKeyLongPress, ViewConfiguration.getLongPressTimeout()); 2751 } 2752 } 2753 } 2754 2755 public void setScrollIndicators(View up, View down) { 2756 mScrollUp = up; 2757 mScrollDown = down; 2758 } 2759 2760 void updateSelectorState() { 2761 if (mSelector != null) { 2762 if (shouldShowSelector()) { 2763 mSelector.setState(getDrawableState()); 2764 } else { 2765 mSelector.setState(StateSet.NOTHING); 2766 } 2767 } 2768 } 2769 2770 @Override 2771 protected void drawableStateChanged() { 2772 super.drawableStateChanged(); 2773 updateSelectorState(); 2774 } 2775 2776 @Override 2777 protected int[] onCreateDrawableState(int extraSpace) { 2778 // If the child view is enabled then do the default behavior. 2779 if (mIsChildViewEnabled) { 2780 // Common case 2781 return super.onCreateDrawableState(extraSpace); 2782 } 2783 2784 // The selector uses this View's drawable state. The selected child view 2785 // is disabled, so we need to remove the enabled state from the drawable 2786 // states. 2787 final int enabledState = ENABLED_STATE_SET[0]; 2788 2789 // If we don't have any extra space, it will return one of the static state arrays, 2790 // and clearing the enabled state on those arrays is a bad thing! If we specify 2791 // we need extra space, it will create+copy into a new array that safely mutable. 2792 int[] state = super.onCreateDrawableState(extraSpace + 1); 2793 int enabledPos = -1; 2794 for (int i = state.length - 1; i >= 0; i--) { 2795 if (state[i] == enabledState) { 2796 enabledPos = i; 2797 break; 2798 } 2799 } 2800 2801 // Remove the enabled state 2802 if (enabledPos >= 0) { 2803 System.arraycopy(state, enabledPos + 1, state, enabledPos, 2804 state.length - enabledPos - 1); 2805 } 2806 2807 return state; 2808 } 2809 2810 @Override 2811 public boolean verifyDrawable(Drawable dr) { 2812 return mSelector == dr || super.verifyDrawable(dr); 2813 } 2814 2815 @Override 2816 public void jumpDrawablesToCurrentState() { 2817 super.jumpDrawablesToCurrentState(); 2818 if (mSelector != null) mSelector.jumpToCurrentState(); 2819 } 2820 2821 @Override 2822 protected void onAttachedToWindow() { 2823 super.onAttachedToWindow(); 2824 2825 final ViewTreeObserver treeObserver = getViewTreeObserver(); 2826 treeObserver.addOnTouchModeChangeListener(this); 2827 if (mTextFilterEnabled && mPopup != null && !mGlobalLayoutListenerAddedFilter) { 2828 treeObserver.addOnGlobalLayoutListener(this); 2829 } 2830 2831 if (mAdapter != null && mDataSetObserver == null) { 2832 mDataSetObserver = new AdapterDataSetObserver(); 2833 mAdapter.registerDataSetObserver(mDataSetObserver); 2834 2835 // Data may have changed while we were detached. Refresh. 2836 mDataChanged = true; 2837 mOldItemCount = mItemCount; 2838 mItemCount = mAdapter.getCount(); 2839 } 2840 } 2841 2842 @Override 2843 protected void onDetachedFromWindow() { 2844 super.onDetachedFromWindow(); 2845 2846 mIsDetaching = true; 2847 2848 // Dismiss the popup in case onSaveInstanceState() was not invoked 2849 dismissPopup(); 2850 2851 // Detach any view left in the scrap heap 2852 mRecycler.clear(); 2853 2854 final ViewTreeObserver treeObserver = getViewTreeObserver(); 2855 treeObserver.removeOnTouchModeChangeListener(this); 2856 if (mTextFilterEnabled && mPopup != null) { 2857 treeObserver.removeOnGlobalLayoutListener(this); 2858 mGlobalLayoutListenerAddedFilter = false; 2859 } 2860 2861 if (mAdapter != null && mDataSetObserver != null) { 2862 mAdapter.unregisterDataSetObserver(mDataSetObserver); 2863 mDataSetObserver = null; 2864 } 2865 2866 if (mScrollStrictSpan != null) { 2867 mScrollStrictSpan.finish(); 2868 mScrollStrictSpan = null; 2869 } 2870 2871 if (mFlingStrictSpan != null) { 2872 mFlingStrictSpan.finish(); 2873 mFlingStrictSpan = null; 2874 } 2875 2876 if (mFlingRunnable != null) { 2877 removeCallbacks(mFlingRunnable); 2878 } 2879 2880 if (mPositionScroller != null) { 2881 mPositionScroller.stop(); 2882 } 2883 2884 if (mClearScrollingCache != null) { 2885 removeCallbacks(mClearScrollingCache); 2886 } 2887 2888 if (mPerformClick != null) { 2889 removeCallbacks(mPerformClick); 2890 } 2891 2892 if (mTouchModeReset != null) { 2893 removeCallbacks(mTouchModeReset); 2894 mTouchModeReset.run(); 2895 } 2896 2897 mIsDetaching = false; 2898 } 2899 2900 @Override 2901 public void onWindowFocusChanged(boolean hasWindowFocus) { 2902 super.onWindowFocusChanged(hasWindowFocus); 2903 2904 final int touchMode = isInTouchMode() ? TOUCH_MODE_ON : TOUCH_MODE_OFF; 2905 2906 if (!hasWindowFocus) { 2907 setChildrenDrawingCacheEnabled(false); 2908 if (mFlingRunnable != null) { 2909 removeCallbacks(mFlingRunnable); 2910 // let the fling runnable report it's new state which 2911 // should be idle 2912 mFlingRunnable.endFling(); 2913 if (mPositionScroller != null) { 2914 mPositionScroller.stop(); 2915 } 2916 if (mScrollY != 0) { 2917 mScrollY = 0; 2918 invalidateParentCaches(); 2919 finishGlows(); 2920 invalidate(); 2921 } 2922 } 2923 // Always hide the type filter 2924 dismissPopup(); 2925 2926 if (touchMode == TOUCH_MODE_OFF) { 2927 // Remember the last selected element 2928 mResurrectToPosition = mSelectedPosition; 2929 } 2930 } else { 2931 if (mFiltered && !mPopupHidden) { 2932 // Show the type filter only if a filter is in effect 2933 showPopup(); 2934 } 2935 2936 // If we changed touch mode since the last time we had focus 2937 if (touchMode != mLastTouchMode && mLastTouchMode != TOUCH_MODE_UNKNOWN) { 2938 // If we come back in trackball mode, we bring the selection back 2939 if (touchMode == TOUCH_MODE_OFF) { 2940 // This will trigger a layout 2941 resurrectSelection(); 2942 2943 // If we come back in touch mode, then we want to hide the selector 2944 } else { 2945 hideSelector(); 2946 mLayoutMode = LAYOUT_NORMAL; 2947 layoutChildren(); 2948 } 2949 } 2950 } 2951 2952 mLastTouchMode = touchMode; 2953 } 2954 2955 @Override 2956 public void onRtlPropertiesChanged(int layoutDirection) { 2957 super.onRtlPropertiesChanged(layoutDirection); 2958 if (mFastScroll != null) { 2959 mFastScroll.setScrollbarPosition(getVerticalScrollbarPosition()); 2960 } 2961 } 2962 2963 /** 2964 * Creates the ContextMenuInfo returned from {@link #getContextMenuInfo()}. This 2965 * methods knows the view, position and ID of the item that received the 2966 * long press. 2967 * 2968 * @param view The view that received the long press. 2969 * @param position The position of the item that received the long press. 2970 * @param id The ID of the item that received the long press. 2971 * @return The extra information that should be returned by 2972 * {@link #getContextMenuInfo()}. 2973 */ 2974 ContextMenuInfo createContextMenuInfo(View view, int position, long id) { 2975 return new AdapterContextMenuInfo(view, position, id); 2976 } 2977 2978 @Override 2979 public void onCancelPendingInputEvents() { 2980 super.onCancelPendingInputEvents(); 2981 if (mPerformClick != null) { 2982 removeCallbacks(mPerformClick); 2983 } 2984 if (mPendingCheckForTap != null) { 2985 removeCallbacks(mPendingCheckForTap); 2986 } 2987 if (mPendingCheckForLongPress != null) { 2988 removeCallbacks(mPendingCheckForLongPress); 2989 } 2990 if (mPendingCheckForKeyLongPress != null) { 2991 removeCallbacks(mPendingCheckForKeyLongPress); 2992 } 2993 } 2994 2995 /** 2996 * A base class for Runnables that will check that their view is still attached to 2997 * the original window as when the Runnable was created. 2998 * 2999 */ 3000 private class WindowRunnnable { 3001 private int mOriginalAttachCount; 3002 3003 public void rememberWindowAttachCount() { 3004 mOriginalAttachCount = getWindowAttachCount(); 3005 } 3006 3007 public boolean sameWindow() { 3008 return getWindowAttachCount() == mOriginalAttachCount; 3009 } 3010 } 3011 3012 private class PerformClick extends WindowRunnnable implements Runnable { 3013 int mClickMotionPosition; 3014 3015 @Override 3016 public void run() { 3017 // The data has changed since we posted this action in the event queue, 3018 // bail out before bad things happen 3019 if (mDataChanged) return; 3020 3021 final ListAdapter adapter = mAdapter; 3022 final int motionPosition = mClickMotionPosition; 3023 if (adapter != null && mItemCount > 0 && 3024 motionPosition != INVALID_POSITION && 3025 motionPosition < adapter.getCount() && sameWindow()) { 3026 final View view = getChildAt(motionPosition - mFirstPosition); 3027 // If there is no view, something bad happened (the view scrolled off the 3028 // screen, etc.) and we should cancel the click 3029 if (view != null) { 3030 performItemClick(view, motionPosition, adapter.getItemId(motionPosition)); 3031 } 3032 } 3033 } 3034 } 3035 3036 private class CheckForLongPress extends WindowRunnnable implements Runnable { 3037 @Override 3038 public void run() { 3039 final int motionPosition = mMotionPosition; 3040 final View child = getChildAt(motionPosition - mFirstPosition); 3041 if (child != null) { 3042 final int longPressPosition = mMotionPosition; 3043 final long longPressId = mAdapter.getItemId(mMotionPosition); 3044 3045 boolean handled = false; 3046 if (sameWindow() && !mDataChanged) { 3047 handled = performLongPress(child, longPressPosition, longPressId); 3048 } 3049 if (handled) { 3050 mTouchMode = TOUCH_MODE_REST; 3051 setPressed(false); 3052 child.setPressed(false); 3053 } else { 3054 mTouchMode = TOUCH_MODE_DONE_WAITING; 3055 } 3056 } 3057 } 3058 } 3059 3060 private class CheckForKeyLongPress extends WindowRunnnable implements Runnable { 3061 @Override 3062 public void run() { 3063 if (isPressed() && mSelectedPosition >= 0) { 3064 int index = mSelectedPosition - mFirstPosition; 3065 View v = getChildAt(index); 3066 3067 if (!mDataChanged) { 3068 boolean handled = false; 3069 if (sameWindow()) { 3070 handled = performLongPress(v, mSelectedPosition, mSelectedRowId); 3071 } 3072 if (handled) { 3073 setPressed(false); 3074 v.setPressed(false); 3075 } 3076 } else { 3077 setPressed(false); 3078 if (v != null) v.setPressed(false); 3079 } 3080 } 3081 } 3082 } 3083 3084 boolean performLongPress(final View child, 3085 final int longPressPosition, final long longPressId) { 3086 // CHOICE_MODE_MULTIPLE_MODAL takes over long press. 3087 if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { 3088 if (mChoiceActionMode == null && 3089 (mChoiceActionMode = startActionMode(mMultiChoiceModeCallback)) != null) { 3090 setItemChecked(longPressPosition, true); 3091 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3092 } 3093 return true; 3094 } 3095 3096 boolean handled = false; 3097 if (mOnItemLongClickListener != null) { 3098 handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, child, 3099 longPressPosition, longPressId); 3100 } 3101 if (!handled) { 3102 mContextMenuInfo = createContextMenuInfo(child, longPressPosition, longPressId); 3103 handled = super.showContextMenuForChild(AbsListView.this); 3104 } 3105 if (handled) { 3106 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3107 } 3108 return handled; 3109 } 3110 3111 @Override 3112 protected ContextMenuInfo getContextMenuInfo() { 3113 return mContextMenuInfo; 3114 } 3115 3116 /** @hide */ 3117 @Override 3118 public boolean showContextMenu(float x, float y, int metaState) { 3119 final int position = pointToPosition((int)x, (int)y); 3120 if (position != INVALID_POSITION) { 3121 final long id = mAdapter.getItemId(position); 3122 View child = getChildAt(position - mFirstPosition); 3123 if (child != null) { 3124 mContextMenuInfo = createContextMenuInfo(child, position, id); 3125 return super.showContextMenuForChild(AbsListView.this); 3126 } 3127 } 3128 return super.showContextMenu(x, y, metaState); 3129 } 3130 3131 @Override 3132 public boolean showContextMenuForChild(View originalView) { 3133 final int longPressPosition = getPositionForView(originalView); 3134 if (longPressPosition >= 0) { 3135 final long longPressId = mAdapter.getItemId(longPressPosition); 3136 boolean handled = false; 3137 3138 if (mOnItemLongClickListener != null) { 3139 handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, originalView, 3140 longPressPosition, longPressId); 3141 } 3142 if (!handled) { 3143 mContextMenuInfo = createContextMenuInfo( 3144 getChildAt(longPressPosition - mFirstPosition), 3145 longPressPosition, longPressId); 3146 handled = super.showContextMenuForChild(originalView); 3147 } 3148 3149 return handled; 3150 } 3151 return false; 3152 } 3153 3154 @Override 3155 public boolean onKeyDown(int keyCode, KeyEvent event) { 3156 return false; 3157 } 3158 3159 @Override 3160 public boolean onKeyUp(int keyCode, KeyEvent event) { 3161 if (KeyEvent.isConfirmKey(keyCode)) { 3162 if (!isEnabled()) { 3163 return true; 3164 } 3165 if (isClickable() && isPressed() && 3166 mSelectedPosition >= 0 && mAdapter != null && 3167 mSelectedPosition < mAdapter.getCount()) { 3168 3169 final View view = getChildAt(mSelectedPosition - mFirstPosition); 3170 if (view != null) { 3171 performItemClick(view, mSelectedPosition, mSelectedRowId); 3172 view.setPressed(false); 3173 } 3174 setPressed(false); 3175 return true; 3176 } 3177 } 3178 return super.onKeyUp(keyCode, event); 3179 } 3180 3181 @Override 3182 protected void dispatchSetPressed(boolean pressed) { 3183 // Don't dispatch setPressed to our children. We call setPressed on ourselves to 3184 // get the selector in the right state, but we don't want to press each child. 3185 } 3186 3187 /** 3188 * Maps a point to a position in the list. 3189 * 3190 * @param x X in local coordinate 3191 * @param y Y in local coordinate 3192 * @return The position of the item which contains the specified point, or 3193 * {@link #INVALID_POSITION} if the point does not intersect an item. 3194 */ 3195 public int pointToPosition(int x, int y) { 3196 Rect frame = mTouchFrame; 3197 if (frame == null) { 3198 mTouchFrame = new Rect(); 3199 frame = mTouchFrame; 3200 } 3201 3202 final int count = getChildCount(); 3203 for (int i = count - 1; i >= 0; i--) { 3204 final View child = getChildAt(i); 3205 if (child.getVisibility() == View.VISIBLE) { 3206 child.getHitRect(frame); 3207 if (frame.contains(x, y)) { 3208 return mFirstPosition + i; 3209 } 3210 } 3211 } 3212 return INVALID_POSITION; 3213 } 3214 3215 3216 /** 3217 * Maps a point to a the rowId of the item which intersects that point. 3218 * 3219 * @param x X in local coordinate 3220 * @param y Y in local coordinate 3221 * @return The rowId of the item which contains the specified point, or {@link #INVALID_ROW_ID} 3222 * if the point does not intersect an item. 3223 */ 3224 public long pointToRowId(int x, int y) { 3225 int position = pointToPosition(x, y); 3226 if (position >= 0) { 3227 return mAdapter.getItemId(position); 3228 } 3229 return INVALID_ROW_ID; 3230 } 3231 3232 private final class CheckForTap implements Runnable { 3233 float x; 3234 float y; 3235 3236 @Override 3237 public void run() { 3238 if (mTouchMode == TOUCH_MODE_DOWN) { 3239 mTouchMode = TOUCH_MODE_TAP; 3240 final View child = getChildAt(mMotionPosition - mFirstPosition); 3241 if (child != null && !child.hasFocusable()) { 3242 mLayoutMode = LAYOUT_NORMAL; 3243 3244 if (!mDataChanged) { 3245 child.setPressed(true); 3246 setPressed(true); 3247 layoutChildren(); 3248 positionSelector(mMotionPosition, child); 3249 refreshDrawableState(); 3250 3251 final int longPressTimeout = ViewConfiguration.getLongPressTimeout(); 3252 final boolean longClickable = isLongClickable(); 3253 3254 if (mSelector != null) { 3255 final Drawable d = mSelector.getCurrent(); 3256 if (d != null && d instanceof TransitionDrawable) { 3257 if (longClickable) { 3258 ((TransitionDrawable) d).startTransition(longPressTimeout); 3259 } else { 3260 ((TransitionDrawable) d).resetTransition(); 3261 } 3262 } 3263 mSelector.setHotspot(x, y); 3264 } 3265 3266 if (longClickable) { 3267 if (mPendingCheckForLongPress == null) { 3268 mPendingCheckForLongPress = new CheckForLongPress(); 3269 } 3270 mPendingCheckForLongPress.rememberWindowAttachCount(); 3271 postDelayed(mPendingCheckForLongPress, longPressTimeout); 3272 } else { 3273 mTouchMode = TOUCH_MODE_DONE_WAITING; 3274 } 3275 } else { 3276 mTouchMode = TOUCH_MODE_DONE_WAITING; 3277 } 3278 } 3279 } 3280 } 3281 } 3282 3283 private boolean startScrollIfNeeded(int x, int y, MotionEvent vtev) { 3284 // Check if we have moved far enough that it looks more like a 3285 // scroll than a tap 3286 final int deltaY = y - mMotionY; 3287 final int distance = Math.abs(deltaY); 3288 final boolean overscroll = mScrollY != 0; 3289 if ((overscroll || distance > mTouchSlop) && 3290 (getNestedScrollAxes() & SCROLL_AXIS_VERTICAL) == 0) { 3291 createScrollingCache(); 3292 if (overscroll) { 3293 mTouchMode = TOUCH_MODE_OVERSCROLL; 3294 mMotionCorrection = 0; 3295 } else { 3296 mTouchMode = TOUCH_MODE_SCROLL; 3297 mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop; 3298 } 3299 removeCallbacks(mPendingCheckForLongPress); 3300 setPressed(false); 3301 final View motionView = getChildAt(mMotionPosition - mFirstPosition); 3302 if (motionView != null) { 3303 motionView.setPressed(false); 3304 } 3305 reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 3306 // Time to start stealing events! Once we've stolen them, don't let anyone 3307 // steal from us 3308 final ViewParent parent = getParent(); 3309 if (parent != null) { 3310 parent.requestDisallowInterceptTouchEvent(true); 3311 } 3312 scrollIfNeeded(x, y, vtev); 3313 return true; 3314 } 3315 3316 return false; 3317 } 3318 3319 private void scrollIfNeeded(int x, int y, MotionEvent vtev) { 3320 int rawDeltaY = y - mMotionY; 3321 int scrollOffsetCorrection = 0; 3322 int scrollConsumedCorrection = 0; 3323 if (mLastY == Integer.MIN_VALUE) { 3324 rawDeltaY -= mMotionCorrection; 3325 } 3326 if (dispatchNestedPreScroll(0, -rawDeltaY, mScrollConsumed, mScrollOffset)) { 3327 rawDeltaY += mScrollConsumed[1]; 3328 scrollOffsetCorrection -= mScrollOffset[1]; 3329 scrollConsumedCorrection -= mScrollConsumed[1]; 3330 if (vtev != null) { 3331 vtev.offsetLocation(0, mScrollOffset[1]); 3332 } 3333 } 3334 final int deltaY = rawDeltaY; 3335 int incrementalDeltaY = 3336 mLastY != Integer.MIN_VALUE ? y - mLastY + scrollConsumedCorrection : deltaY; 3337 int lastYCorrection = 0; 3338 3339 if (mTouchMode == TOUCH_MODE_SCROLL) { 3340 if (PROFILE_SCROLLING) { 3341 if (!mScrollProfilingStarted) { 3342 Debug.startMethodTracing("AbsListViewScroll"); 3343 mScrollProfilingStarted = true; 3344 } 3345 } 3346 3347 if (mScrollStrictSpan == null) { 3348 // If it's non-null, we're already in a scroll. 3349 mScrollStrictSpan = StrictMode.enterCriticalSpan("AbsListView-scroll"); 3350 } 3351 3352 if (y != mLastY) { 3353 // We may be here after stopping a fling and continuing to scroll. 3354 // If so, we haven't disallowed intercepting touch events yet. 3355 // Make sure that we do so in case we're in a parent that can intercept. 3356 if ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) == 0 && 3357 Math.abs(rawDeltaY) > mTouchSlop) { 3358 final ViewParent parent = getParent(); 3359 if (parent != null) { 3360 parent.requestDisallowInterceptTouchEvent(true); 3361 } 3362 } 3363 3364 final int motionIndex; 3365 if (mMotionPosition >= 0) { 3366 motionIndex = mMotionPosition - mFirstPosition; 3367 } else { 3368 // If we don't have a motion position that we can reliably track, 3369 // pick something in the middle to make a best guess at things below. 3370 motionIndex = getChildCount() / 2; 3371 } 3372 3373 int motionViewPrevTop = 0; 3374 View motionView = this.getChildAt(motionIndex); 3375 if (motionView != null) { 3376 motionViewPrevTop = motionView.getTop(); 3377 } 3378 3379 // No need to do all this work if we're not going to move anyway 3380 boolean atEdge = false; 3381 if (incrementalDeltaY != 0) { 3382 atEdge = trackMotionScroll(deltaY, incrementalDeltaY); 3383 } 3384 3385 // Check to see if we have bumped into the scroll limit 3386 motionView = this.getChildAt(motionIndex); 3387 if (motionView != null) { 3388 // Check if the top of the motion view is where it is 3389 // supposed to be 3390 final int motionViewRealTop = motionView.getTop(); 3391 if (atEdge) { 3392 // Apply overscroll 3393 3394 int overscroll = -incrementalDeltaY - 3395 (motionViewRealTop - motionViewPrevTop); 3396 if (dispatchNestedScroll(0, overscroll - incrementalDeltaY, 0, overscroll, 3397 mScrollOffset)) { 3398 lastYCorrection -= mScrollOffset[1]; 3399 if (vtev != null) { 3400 vtev.offsetLocation(0, mScrollOffset[1]); 3401 } 3402 } else { 3403 final boolean atOverscrollEdge = overScrollBy(0, overscroll, 3404 0, mScrollY, 0, 0, 0, mOverscrollDistance, true); 3405 3406 if (atOverscrollEdge && mVelocityTracker != null) { 3407 // Don't allow overfling if we're at the edge 3408 mVelocityTracker.clear(); 3409 } 3410 3411 final int overscrollMode = getOverScrollMode(); 3412 if (overscrollMode == OVER_SCROLL_ALWAYS || 3413 (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && 3414 !contentFits())) { 3415 if (!atOverscrollEdge) { 3416 mDirection = 0; // Reset when entering overscroll. 3417 mTouchMode = TOUCH_MODE_OVERSCROLL; 3418 } 3419 if (incrementalDeltaY > 0) { 3420 mEdgeGlowTop.onPull((float) -overscroll / getHeight(), 3421 (float) x / getWidth()); 3422 if (!mEdgeGlowBottom.isFinished()) { 3423 mEdgeGlowBottom.onRelease(); 3424 } 3425 invalidate(0, 0, getWidth(), 3426 mEdgeGlowTop.getMaxHeight() + getPaddingTop()); 3427 } else if (incrementalDeltaY < 0) { 3428 mEdgeGlowBottom.onPull((float) overscroll / getHeight(), 3429 1.f - (float) x / getWidth()); 3430 if (!mEdgeGlowTop.isFinished()) { 3431 mEdgeGlowTop.onRelease(); 3432 } 3433 invalidate(0, getHeight() - getPaddingBottom() - 3434 mEdgeGlowBottom.getMaxHeight(), getWidth(), 3435 getHeight()); 3436 } 3437 } 3438 } 3439 } 3440 mMotionY = y + scrollOffsetCorrection; 3441 } 3442 mLastY = y + lastYCorrection + scrollOffsetCorrection; 3443 } 3444 } else if (mTouchMode == TOUCH_MODE_OVERSCROLL) { 3445 if (y != mLastY) { 3446 final int oldScroll = mScrollY; 3447 final int newScroll = oldScroll - incrementalDeltaY; 3448 int newDirection = y > mLastY ? 1 : -1; 3449 3450 if (mDirection == 0) { 3451 mDirection = newDirection; 3452 } 3453 3454 int overScrollDistance = -incrementalDeltaY; 3455 if ((newScroll < 0 && oldScroll >= 0) || (newScroll > 0 && oldScroll <= 0)) { 3456 overScrollDistance = -oldScroll; 3457 incrementalDeltaY += overScrollDistance; 3458 } else { 3459 incrementalDeltaY = 0; 3460 } 3461 3462 if (overScrollDistance != 0) { 3463 overScrollBy(0, overScrollDistance, 0, mScrollY, 0, 0, 3464 0, mOverscrollDistance, true); 3465 final int overscrollMode = getOverScrollMode(); 3466 if (overscrollMode == OVER_SCROLL_ALWAYS || 3467 (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && 3468 !contentFits())) { 3469 if (rawDeltaY > 0) { 3470 mEdgeGlowTop.onPull((float) overScrollDistance / getHeight(), 3471 (float) x / getWidth()); 3472 if (!mEdgeGlowBottom.isFinished()) { 3473 mEdgeGlowBottom.onRelease(); 3474 } 3475 invalidate(0, 0, getWidth(), 3476 mEdgeGlowTop.getMaxHeight() + getPaddingTop()); 3477 } else if (rawDeltaY < 0) { 3478 mEdgeGlowBottom.onPull((float) overScrollDistance / getHeight(), 3479 1.f - (float) x / getWidth()); 3480 if (!mEdgeGlowTop.isFinished()) { 3481 mEdgeGlowTop.onRelease(); 3482 } 3483 invalidate(0, getHeight() - getPaddingBottom() - 3484 mEdgeGlowBottom.getMaxHeight(), getWidth(), 3485 getHeight()); 3486 } 3487 } 3488 } 3489 3490 if (incrementalDeltaY != 0) { 3491 // Coming back to 'real' list scrolling 3492 if (mScrollY != 0) { 3493 mScrollY = 0; 3494 invalidateParentIfNeeded(); 3495 } 3496 3497 trackMotionScroll(incrementalDeltaY, incrementalDeltaY); 3498 3499 mTouchMode = TOUCH_MODE_SCROLL; 3500 3501 // We did not scroll the full amount. Treat this essentially like the 3502 // start of a new touch scroll 3503 final int motionPosition = findClosestMotionRow(y); 3504 3505 mMotionCorrection = 0; 3506 View motionView = getChildAt(motionPosition - mFirstPosition); 3507 mMotionViewOriginalTop = motionView != null ? motionView.getTop() : 0; 3508 mMotionY = y; 3509 mMotionPosition = motionPosition; 3510 } 3511 mLastY = y; 3512 mDirection = newDirection; 3513 } 3514 } 3515 } 3516 3517 @Override 3518 public void onTouchModeChanged(boolean isInTouchMode) { 3519 if (isInTouchMode) { 3520 // Get rid of the selection when we enter touch mode 3521 hideSelector(); 3522 // Layout, but only if we already have done so previously. 3523 // (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore 3524 // state.) 3525 if (getHeight() > 0 && getChildCount() > 0) { 3526 // We do not lose focus initiating a touch (since AbsListView is focusable in 3527 // touch mode). Force an initial layout to get rid of the selection. 3528 layoutChildren(); 3529 } 3530 updateSelectorState(); 3531 } else { 3532 int touchMode = mTouchMode; 3533 if (touchMode == TOUCH_MODE_OVERSCROLL || touchMode == TOUCH_MODE_OVERFLING) { 3534 if (mFlingRunnable != null) { 3535 mFlingRunnable.endFling(); 3536 } 3537 if (mPositionScroller != null) { 3538 mPositionScroller.stop(); 3539 } 3540 3541 if (mScrollY != 0) { 3542 mScrollY = 0; 3543 invalidateParentCaches(); 3544 finishGlows(); 3545 invalidate(); 3546 } 3547 } 3548 } 3549 } 3550 3551 @Override 3552 public boolean onTouchEvent(MotionEvent ev) { 3553 if (!isEnabled()) { 3554 // A disabled view that is clickable still consumes the touch 3555 // events, it just doesn't respond to them. 3556 return isClickable() || isLongClickable(); 3557 } 3558 3559 if (mPositionScroller != null) { 3560 mPositionScroller.stop(); 3561 } 3562 3563 if (mIsDetaching || !isAttachedToWindow()) { 3564 // Something isn't right. 3565 // Since we rely on being attached to get data set change notifications, 3566 // don't risk doing anything where we might try to resync and find things 3567 // in a bogus state. 3568 return false; 3569 } 3570 3571 startNestedScroll(SCROLL_AXIS_VERTICAL); 3572 3573 if (mFastScroll != null) { 3574 boolean intercepted = mFastScroll.onTouchEvent(ev); 3575 if (intercepted) { 3576 return true; 3577 } 3578 } 3579 3580 initVelocityTrackerIfNotExists(); 3581 final MotionEvent vtev = MotionEvent.obtain(ev); 3582 3583 final int actionMasked = ev.getActionMasked(); 3584 switch (actionMasked) { 3585 case MotionEvent.ACTION_DOWN: { 3586 onTouchDown(ev); 3587 break; 3588 } 3589 3590 case MotionEvent.ACTION_MOVE: { 3591 onTouchMove(ev, vtev); 3592 break; 3593 } 3594 3595 case MotionEvent.ACTION_UP: { 3596 onTouchUp(ev); 3597 break; 3598 } 3599 3600 case MotionEvent.ACTION_CANCEL: { 3601 onTouchCancel(); 3602 break; 3603 } 3604 3605 case MotionEvent.ACTION_POINTER_UP: { 3606 onSecondaryPointerUp(ev); 3607 final int x = mMotionX; 3608 final int y = mMotionY; 3609 final int motionPosition = pointToPosition(x, y); 3610 if (motionPosition >= 0) { 3611 // Remember where the motion event started 3612 final View child = getChildAt(motionPosition - mFirstPosition); 3613 mMotionViewOriginalTop = child.getTop(); 3614 mMotionPosition = motionPosition; 3615 } 3616 mLastY = y; 3617 break; 3618 } 3619 3620 case MotionEvent.ACTION_POINTER_DOWN: { 3621 // New pointers take over dragging duties 3622 final int index = ev.getActionIndex(); 3623 final int id = ev.getPointerId(index); 3624 final int x = (int) ev.getX(index); 3625 final int y = (int) ev.getY(index); 3626 mMotionCorrection = 0; 3627 mActivePointerId = id; 3628 mMotionX = x; 3629 mMotionY = y; 3630 final int motionPosition = pointToPosition(x, y); 3631 if (motionPosition >= 0) { 3632 // Remember where the motion event started 3633 final View child = getChildAt(motionPosition - mFirstPosition); 3634 mMotionViewOriginalTop = child.getTop(); 3635 mMotionPosition = motionPosition; 3636 } 3637 mLastY = y; 3638 break; 3639 } 3640 } 3641 3642 if (mVelocityTracker != null) { 3643 mVelocityTracker.addMovement(vtev); 3644 } 3645 vtev.recycle(); 3646 return true; 3647 } 3648 3649 private void onTouchDown(MotionEvent ev) { 3650 mActivePointerId = ev.getPointerId(0); 3651 3652 if (mTouchMode == TOUCH_MODE_OVERFLING) { 3653 // Stopped the fling. It is a scroll. 3654 mFlingRunnable.endFling(); 3655 if (mPositionScroller != null) { 3656 mPositionScroller.stop(); 3657 } 3658 mTouchMode = TOUCH_MODE_OVERSCROLL; 3659 mMotionX = (int) ev.getX(); 3660 mMotionY = (int) ev.getY(); 3661 mLastY = mMotionY; 3662 mMotionCorrection = 0; 3663 mDirection = 0; 3664 } else { 3665 final int x = (int) ev.getX(); 3666 final int y = (int) ev.getY(); 3667 int motionPosition = pointToPosition(x, y); 3668 3669 if (!mDataChanged) { 3670 if (mTouchMode == TOUCH_MODE_FLING) { 3671 // Stopped a fling. It is a scroll. 3672 createScrollingCache(); 3673 mTouchMode = TOUCH_MODE_SCROLL; 3674 mMotionCorrection = 0; 3675 motionPosition = findMotionRow(y); 3676 mFlingRunnable.flywheelTouch(); 3677 } else if ((motionPosition >= 0) && getAdapter().isEnabled(motionPosition)) { 3678 // User clicked on an actual view (and was not stopping a 3679 // fling). It might be a click or a scroll. Assume it is a 3680 // click until proven otherwise. 3681 mTouchMode = TOUCH_MODE_DOWN; 3682 3683 // FIXME Debounce 3684 if (mPendingCheckForTap == null) { 3685 mPendingCheckForTap = new CheckForTap(); 3686 } 3687 3688 mPendingCheckForTap.x = ev.getX(); 3689 mPendingCheckForTap.y = ev.getY(); 3690 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 3691 } 3692 } 3693 3694 if (motionPosition >= 0) { 3695 // Remember where the motion event started 3696 final View v = getChildAt(motionPosition - mFirstPosition); 3697 mMotionViewOriginalTop = v.getTop(); 3698 } 3699 3700 mMotionX = x; 3701 mMotionY = y; 3702 mMotionPosition = motionPosition; 3703 mLastY = Integer.MIN_VALUE; 3704 } 3705 3706 if (mTouchMode == TOUCH_MODE_DOWN && mMotionPosition != INVALID_POSITION 3707 && performButtonActionOnTouchDown(ev)) { 3708 removeCallbacks(mPendingCheckForTap); 3709 } 3710 } 3711 3712 private void onTouchMove(MotionEvent ev, MotionEvent vtev) { 3713 int pointerIndex = ev.findPointerIndex(mActivePointerId); 3714 if (pointerIndex == -1) { 3715 pointerIndex = 0; 3716 mActivePointerId = ev.getPointerId(pointerIndex); 3717 } 3718 3719 if (mDataChanged) { 3720 // Re-sync everything if data has been changed 3721 // since the scroll operation can query the adapter. 3722 layoutChildren(); 3723 } 3724 3725 final int y = (int) ev.getY(pointerIndex); 3726 3727 switch (mTouchMode) { 3728 case TOUCH_MODE_DOWN: 3729 case TOUCH_MODE_TAP: 3730 case TOUCH_MODE_DONE_WAITING: 3731 // Check if we have moved far enough that it looks more like a 3732 // scroll than a tap. If so, we'll enter scrolling mode. 3733 if (startScrollIfNeeded((int) ev.getX(pointerIndex), y, vtev)) { 3734 break; 3735 } 3736 // Otherwise, check containment within list bounds. If we're 3737 // outside bounds, cancel any active presses. 3738 final float x = ev.getX(pointerIndex); 3739 if (!pointInView(x, y, mTouchSlop)) { 3740 setPressed(false); 3741 final View motionView = getChildAt(mMotionPosition - mFirstPosition); 3742 if (motionView != null) { 3743 motionView.setPressed(false); 3744 } 3745 removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ? 3746 mPendingCheckForTap : mPendingCheckForLongPress); 3747 mTouchMode = TOUCH_MODE_DONE_WAITING; 3748 updateSelectorState(); 3749 } 3750 break; 3751 case TOUCH_MODE_SCROLL: 3752 case TOUCH_MODE_OVERSCROLL: 3753 scrollIfNeeded((int) ev.getX(pointerIndex), y, vtev); 3754 break; 3755 } 3756 } 3757 3758 private void onTouchUp(MotionEvent ev) { 3759 switch (mTouchMode) { 3760 case TOUCH_MODE_DOWN: 3761 case TOUCH_MODE_TAP: 3762 case TOUCH_MODE_DONE_WAITING: 3763 final int motionPosition = mMotionPosition; 3764 final View child = getChildAt(motionPosition - mFirstPosition); 3765 if (child != null) { 3766 if (mTouchMode != TOUCH_MODE_DOWN) { 3767 child.setPressed(false); 3768 } 3769 3770 final float x = ev.getX(); 3771 final boolean inList = x > mListPadding.left && x < getWidth() - mListPadding.right; 3772 if (inList && !child.hasFocusable()) { 3773 if (mPerformClick == null) { 3774 mPerformClick = new PerformClick(); 3775 } 3776 3777 final AbsListView.PerformClick performClick = mPerformClick; 3778 performClick.mClickMotionPosition = motionPosition; 3779 performClick.rememberWindowAttachCount(); 3780 3781 mResurrectToPosition = motionPosition; 3782 3783 if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) { 3784 removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ? 3785 mPendingCheckForTap : mPendingCheckForLongPress); 3786 mLayoutMode = LAYOUT_NORMAL; 3787 if (!mDataChanged && mAdapter.isEnabled(motionPosition)) { 3788 mTouchMode = TOUCH_MODE_TAP; 3789 setSelectedPositionInt(mMotionPosition); 3790 layoutChildren(); 3791 child.setPressed(true); 3792 positionSelector(mMotionPosition, child); 3793 setPressed(true); 3794 if (mSelector != null) { 3795 Drawable d = mSelector.getCurrent(); 3796 if (d != null && d instanceof TransitionDrawable) { 3797 ((TransitionDrawable) d).resetTransition(); 3798 } 3799 mSelector.setHotspot(x, ev.getY()); 3800 } 3801 if (mTouchModeReset != null) { 3802 removeCallbacks(mTouchModeReset); 3803 } 3804 mTouchModeReset = new Runnable() { 3805 @Override 3806 public void run() { 3807 mTouchModeReset = null; 3808 mTouchMode = TOUCH_MODE_REST; 3809 child.setPressed(false); 3810 setPressed(false); 3811 if (!mDataChanged && !mIsDetaching && isAttachedToWindow()) { 3812 performClick.run(); 3813 } 3814 } 3815 }; 3816 postDelayed(mTouchModeReset, 3817 ViewConfiguration.getPressedStateDuration()); 3818 } else { 3819 mTouchMode = TOUCH_MODE_REST; 3820 updateSelectorState(); 3821 } 3822 return; 3823 } else if (!mDataChanged && mAdapter.isEnabled(motionPosition)) { 3824 performClick.run(); 3825 } 3826 } 3827 } 3828 mTouchMode = TOUCH_MODE_REST; 3829 updateSelectorState(); 3830 break; 3831 case TOUCH_MODE_SCROLL: 3832 final int childCount = getChildCount(); 3833 if (childCount > 0) { 3834 final int firstChildTop = getChildAt(0).getTop(); 3835 final int lastChildBottom = getChildAt(childCount - 1).getBottom(); 3836 final int contentTop = mListPadding.top; 3837 final int contentBottom = getHeight() - mListPadding.bottom; 3838 if (mFirstPosition == 0 && firstChildTop >= contentTop && 3839 mFirstPosition + childCount < mItemCount && 3840 lastChildBottom <= getHeight() - contentBottom) { 3841 mTouchMode = TOUCH_MODE_REST; 3842 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 3843 } else { 3844 final VelocityTracker velocityTracker = mVelocityTracker; 3845 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 3846 3847 final int initialVelocity = (int) 3848 (velocityTracker.getYVelocity(mActivePointerId) * mVelocityScale); 3849 // Fling if we have enough velocity and we aren't at a boundary. 3850 // Since we can potentially overfling more than we can overscroll, don't 3851 // allow the weird behavior where you can scroll to a boundary then 3852 // fling further. 3853 boolean flingVelocity = Math.abs(initialVelocity) > mMinimumVelocity; 3854 if (flingVelocity && 3855 !((mFirstPosition == 0 && 3856 firstChildTop == contentTop - mOverscrollDistance) || 3857 (mFirstPosition + childCount == mItemCount && 3858 lastChildBottom == contentBottom + mOverscrollDistance))) { 3859 if (!dispatchNestedPreFling(0, -initialVelocity)) { 3860 if (mFlingRunnable == null) { 3861 mFlingRunnable = new FlingRunnable(); 3862 } 3863 reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 3864 mFlingRunnable.start(-initialVelocity); 3865 dispatchNestedFling(0, -initialVelocity, true); 3866 } else { 3867 mTouchMode = TOUCH_MODE_REST; 3868 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 3869 } 3870 } else { 3871 mTouchMode = TOUCH_MODE_REST; 3872 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 3873 if (mFlingRunnable != null) { 3874 mFlingRunnable.endFling(); 3875 } 3876 if (mPositionScroller != null) { 3877 mPositionScroller.stop(); 3878 } 3879 if (flingVelocity) { 3880 dispatchNestedFling(0, -initialVelocity, false); 3881 } 3882 } 3883 } 3884 } else { 3885 mTouchMode = TOUCH_MODE_REST; 3886 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 3887 } 3888 break; 3889 3890 case TOUCH_MODE_OVERSCROLL: 3891 if (mFlingRunnable == null) { 3892 mFlingRunnable = new FlingRunnable(); 3893 } 3894 final VelocityTracker velocityTracker = mVelocityTracker; 3895 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 3896 final int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 3897 3898 reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 3899 if (Math.abs(initialVelocity) > mMinimumVelocity) { 3900 mFlingRunnable.startOverfling(-initialVelocity); 3901 } else { 3902 mFlingRunnable.startSpringback(); 3903 } 3904 3905 break; 3906 } 3907 3908 setPressed(false); 3909 3910 if (mEdgeGlowTop != null) { 3911 mEdgeGlowTop.onRelease(); 3912 mEdgeGlowBottom.onRelease(); 3913 } 3914 3915 // Need to redraw since we probably aren't drawing the selector anymore 3916 invalidate(); 3917 removeCallbacks(mPendingCheckForLongPress); 3918 recycleVelocityTracker(); 3919 3920 mActivePointerId = INVALID_POINTER; 3921 3922 if (PROFILE_SCROLLING) { 3923 if (mScrollProfilingStarted) { 3924 Debug.stopMethodTracing(); 3925 mScrollProfilingStarted = false; 3926 } 3927 } 3928 3929 if (mScrollStrictSpan != null) { 3930 mScrollStrictSpan.finish(); 3931 mScrollStrictSpan = null; 3932 } 3933 } 3934 3935 private void onTouchCancel() { 3936 switch (mTouchMode) { 3937 case TOUCH_MODE_OVERSCROLL: 3938 if (mFlingRunnable == null) { 3939 mFlingRunnable = new FlingRunnable(); 3940 } 3941 mFlingRunnable.startSpringback(); 3942 break; 3943 3944 case TOUCH_MODE_OVERFLING: 3945 // Do nothing - let it play out. 3946 break; 3947 3948 default: 3949 mTouchMode = TOUCH_MODE_REST; 3950 setPressed(false); 3951 final View motionView = this.getChildAt(mMotionPosition - mFirstPosition); 3952 if (motionView != null) { 3953 motionView.setPressed(false); 3954 } 3955 clearScrollingCache(); 3956 removeCallbacks(mPendingCheckForLongPress); 3957 recycleVelocityTracker(); 3958 } 3959 3960 if (mEdgeGlowTop != null) { 3961 mEdgeGlowTop.onRelease(); 3962 mEdgeGlowBottom.onRelease(); 3963 } 3964 mActivePointerId = INVALID_POINTER; 3965 } 3966 3967 @Override 3968 protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) { 3969 if (mScrollY != scrollY) { 3970 onScrollChanged(mScrollX, scrollY, mScrollX, mScrollY); 3971 mScrollY = scrollY; 3972 invalidateParentIfNeeded(); 3973 3974 awakenScrollBars(); 3975 } 3976 } 3977 3978 @Override 3979 public boolean onGenericMotionEvent(MotionEvent event) { 3980 if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 3981 switch (event.getAction()) { 3982 case MotionEvent.ACTION_SCROLL: { 3983 if (mTouchMode == TOUCH_MODE_REST) { 3984 final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 3985 if (vscroll != 0) { 3986 final int delta = (int) (vscroll * getVerticalScrollFactor()); 3987 if (!trackMotionScroll(delta, delta)) { 3988 return true; 3989 } 3990 } 3991 } 3992 } 3993 } 3994 } 3995 return super.onGenericMotionEvent(event); 3996 } 3997 3998 /** 3999 * Initiate a fling with the given velocity. 4000 * 4001 * <p>Applications can use this method to manually initiate a fling as if the user 4002 * initiated it via touch interaction.</p> 4003 * 4004 * @param velocityY Vertical velocity in pixels per second 4005 */ 4006 public void fling(int velocityY) { 4007 if (mFlingRunnable == null) { 4008 mFlingRunnable = new FlingRunnable(); 4009 } 4010 reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 4011 mFlingRunnable.start(-velocityY); 4012 } 4013 4014 @Override 4015 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 4016 return ((nestedScrollAxes & SCROLL_AXIS_VERTICAL) != 0); 4017 } 4018 4019 @Override 4020 public void onNestedScrollAccepted(View child, View target, int axes) { 4021 super.onNestedScrollAccepted(child, target, axes); 4022 startNestedScroll(SCROLL_AXIS_VERTICAL); 4023 } 4024 4025 @Override 4026 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 4027 int dxUnconsumed, int dyUnconsumed) { 4028 final int motionIndex = getChildCount() / 2; 4029 final View motionView = getChildAt(motionIndex); 4030 final int oldTop = motionView != null ? motionView.getTop() : 0; 4031 if (motionView == null || trackMotionScroll(-dyUnconsumed, -dyUnconsumed)) { 4032 int myUnconsumed = dyUnconsumed; 4033 int myConsumed = 0; 4034 if (motionView != null) { 4035 myConsumed = motionView.getTop() - oldTop; 4036 myUnconsumed -= myConsumed; 4037 } 4038 dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null); 4039 } 4040 } 4041 4042 @Override 4043 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 4044 final int childCount = getChildCount(); 4045 if (!consumed && childCount > 0 && canScrollList((int) velocityY) && 4046 Math.abs(velocityY) > mMinimumVelocity) { 4047 reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 4048 if (mFlingRunnable == null) { 4049 mFlingRunnable = new FlingRunnable(); 4050 } 4051 if (!dispatchNestedPreFling(0, velocityY)) { 4052 mFlingRunnable.start((int) velocityY); 4053 } 4054 return true; 4055 } 4056 return dispatchNestedFling(velocityX, velocityY, consumed); 4057 } 4058 4059 @Override 4060 public void draw(Canvas canvas) { 4061 super.draw(canvas); 4062 if (mEdgeGlowTop != null) { 4063 final int scrollY = mScrollY; 4064 if (!mEdgeGlowTop.isFinished()) { 4065 final int restoreCount = canvas.save(); 4066 final int width = getWidth(); 4067 4068 int edgeY = Math.min(0, scrollY + mFirstPositionDistanceGuess); 4069 canvas.translate(0, edgeY); 4070 mEdgeGlowTop.setSize(width, getHeight()); 4071 if (mEdgeGlowTop.draw(canvas)) { 4072 invalidate(0, 0, getWidth(), 4073 mEdgeGlowTop.getMaxHeight() + getPaddingTop()); 4074 } 4075 canvas.restoreToCount(restoreCount); 4076 } 4077 if (!mEdgeGlowBottom.isFinished()) { 4078 final int restoreCount = canvas.save(); 4079 final int width = getWidth(); 4080 final int height = getHeight(); 4081 4082 int edgeX = -width; 4083 int edgeY = Math.max(height, scrollY + mLastPositionDistanceGuess); 4084 canvas.translate(edgeX, edgeY); 4085 canvas.rotate(180, width, 0); 4086 mEdgeGlowBottom.setSize(width, height); 4087 if (mEdgeGlowBottom.draw(canvas)) { 4088 invalidate(0, getHeight() - getPaddingBottom() - 4089 mEdgeGlowBottom.getMaxHeight(), getWidth(), 4090 getHeight()); 4091 } 4092 canvas.restoreToCount(restoreCount); 4093 } 4094 } 4095 } 4096 4097 /** 4098 * @hide 4099 */ 4100 public void setOverScrollEffectPadding(int leftPadding, int rightPadding) { 4101 mGlowPaddingLeft = leftPadding; 4102 mGlowPaddingRight = rightPadding; 4103 } 4104 4105 private void initOrResetVelocityTracker() { 4106 if (mVelocityTracker == null) { 4107 mVelocityTracker = VelocityTracker.obtain(); 4108 } else { 4109 mVelocityTracker.clear(); 4110 } 4111 } 4112 4113 private void initVelocityTrackerIfNotExists() { 4114 if (mVelocityTracker == null) { 4115 mVelocityTracker = VelocityTracker.obtain(); 4116 } 4117 } 4118 4119 private void recycleVelocityTracker() { 4120 if (mVelocityTracker != null) { 4121 mVelocityTracker.recycle(); 4122 mVelocityTracker = null; 4123 } 4124 } 4125 4126 @Override 4127 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 4128 if (disallowIntercept) { 4129 recycleVelocityTracker(); 4130 } 4131 super.requestDisallowInterceptTouchEvent(disallowIntercept); 4132 } 4133 4134 @Override 4135 public boolean onInterceptHoverEvent(MotionEvent event) { 4136 if (mFastScroll != null && mFastScroll.onInterceptHoverEvent(event)) { 4137 return true; 4138 } 4139 4140 return super.onInterceptHoverEvent(event); 4141 } 4142 4143 @Override 4144 public boolean onInterceptTouchEvent(MotionEvent ev) { 4145 int action = ev.getAction(); 4146 View v; 4147 4148 if (mPositionScroller != null) { 4149 mPositionScroller.stop(); 4150 } 4151 4152 if (mIsDetaching || !isAttachedToWindow()) { 4153 // Something isn't right. 4154 // Since we rely on being attached to get data set change notifications, 4155 // don't risk doing anything where we might try to resync and find things 4156 // in a bogus state. 4157 return false; 4158 } 4159 4160 if (mFastScroll != null && mFastScroll.onInterceptTouchEvent(ev)) { 4161 return true; 4162 } 4163 4164 switch (action & MotionEvent.ACTION_MASK) { 4165 case MotionEvent.ACTION_DOWN: { 4166 int touchMode = mTouchMode; 4167 if (touchMode == TOUCH_MODE_OVERFLING || touchMode == TOUCH_MODE_OVERSCROLL) { 4168 mMotionCorrection = 0; 4169 return true; 4170 } 4171 4172 final int x = (int) ev.getX(); 4173 final int y = (int) ev.getY(); 4174 mActivePointerId = ev.getPointerId(0); 4175 4176 int motionPosition = findMotionRow(y); 4177 if (touchMode != TOUCH_MODE_FLING && motionPosition >= 0) { 4178 // User clicked on an actual view (and was not stopping a fling). 4179 // Remember where the motion event started 4180 v = getChildAt(motionPosition - mFirstPosition); 4181 mMotionViewOriginalTop = v.getTop(); 4182 mMotionX = x; 4183 mMotionY = y; 4184 mMotionPosition = motionPosition; 4185 mTouchMode = TOUCH_MODE_DOWN; 4186 clearScrollingCache(); 4187 } 4188 mLastY = Integer.MIN_VALUE; 4189 initOrResetVelocityTracker(); 4190 mVelocityTracker.addMovement(ev); 4191 startNestedScroll(SCROLL_AXIS_VERTICAL); 4192 if (touchMode == TOUCH_MODE_FLING) { 4193 return true; 4194 } 4195 break; 4196 } 4197 4198 case MotionEvent.ACTION_MOVE: { 4199 switch (mTouchMode) { 4200 case TOUCH_MODE_DOWN: 4201 int pointerIndex = ev.findPointerIndex(mActivePointerId); 4202 if (pointerIndex == -1) { 4203 pointerIndex = 0; 4204 mActivePointerId = ev.getPointerId(pointerIndex); 4205 } 4206 final int y = (int) ev.getY(pointerIndex); 4207 initVelocityTrackerIfNotExists(); 4208 mVelocityTracker.addMovement(ev); 4209 if (startScrollIfNeeded((int) ev.getX(pointerIndex), y, null)) { 4210 return true; 4211 } 4212 break; 4213 } 4214 break; 4215 } 4216 4217 case MotionEvent.ACTION_CANCEL: 4218 case MotionEvent.ACTION_UP: { 4219 mTouchMode = TOUCH_MODE_REST; 4220 mActivePointerId = INVALID_POINTER; 4221 recycleVelocityTracker(); 4222 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 4223 stopNestedScroll(); 4224 break; 4225 } 4226 4227 case MotionEvent.ACTION_POINTER_UP: { 4228 onSecondaryPointerUp(ev); 4229 break; 4230 } 4231 } 4232 4233 return false; 4234 } 4235 4236 private void onSecondaryPointerUp(MotionEvent ev) { 4237 final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 4238 MotionEvent.ACTION_POINTER_INDEX_SHIFT; 4239 final int pointerId = ev.getPointerId(pointerIndex); 4240 if (pointerId == mActivePointerId) { 4241 // This was our active pointer going up. Choose a new 4242 // active pointer and adjust accordingly. 4243 // TODO: Make this decision more intelligent. 4244 final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 4245 mMotionX = (int) ev.getX(newPointerIndex); 4246 mMotionY = (int) ev.getY(newPointerIndex); 4247 mMotionCorrection = 0; 4248 mActivePointerId = ev.getPointerId(newPointerIndex); 4249 } 4250 } 4251 4252 /** 4253 * {@inheritDoc} 4254 */ 4255 @Override 4256 public void addTouchables(ArrayList<View> views) { 4257 final int count = getChildCount(); 4258 final int firstPosition = mFirstPosition; 4259 final ListAdapter adapter = mAdapter; 4260 4261 if (adapter == null) { 4262 return; 4263 } 4264 4265 for (int i = 0; i < count; i++) { 4266 final View child = getChildAt(i); 4267 if (adapter.isEnabled(firstPosition + i)) { 4268 views.add(child); 4269 } 4270 child.addTouchables(views); 4271 } 4272 } 4273 4274 /** 4275 * Fires an "on scroll state changed" event to the registered 4276 * {@link android.widget.AbsListView.OnScrollListener}, if any. The state change 4277 * is fired only if the specified state is different from the previously known state. 4278 * 4279 * @param newState The new scroll state. 4280 */ 4281 void reportScrollStateChange(int newState) { 4282 if (newState != mLastScrollState) { 4283 if (mOnScrollListener != null) { 4284 mLastScrollState = newState; 4285 mOnScrollListener.onScrollStateChanged(this, newState); 4286 } 4287 } 4288 } 4289 4290 /** 4291 * Responsible for fling behavior. Use {@link #start(int)} to 4292 * initiate a fling. Each frame of the fling is handled in {@link #run()}. 4293 * A FlingRunnable will keep re-posting itself until the fling is done. 4294 * 4295 */ 4296 private class FlingRunnable implements Runnable { 4297 /** 4298 * Tracks the decay of a fling scroll 4299 */ 4300 private final OverScroller mScroller; 4301 4302 /** 4303 * Y value reported by mScroller on the previous fling 4304 */ 4305 private int mLastFlingY; 4306 4307 private final Runnable mCheckFlywheel = new Runnable() { 4308 @Override 4309 public void run() { 4310 final int activeId = mActivePointerId; 4311 final VelocityTracker vt = mVelocityTracker; 4312 final OverScroller scroller = mScroller; 4313 if (vt == null || activeId == INVALID_POINTER) { 4314 return; 4315 } 4316 4317 vt.computeCurrentVelocity(1000, mMaximumVelocity); 4318 final float yvel = -vt.getYVelocity(activeId); 4319 4320 if (Math.abs(yvel) >= mMinimumVelocity 4321 && scroller.isScrollingInDirection(0, yvel)) { 4322 // Keep the fling alive a little longer 4323 postDelayed(this, FLYWHEEL_TIMEOUT); 4324 } else { 4325 endFling(); 4326 mTouchMode = TOUCH_MODE_SCROLL; 4327 reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); 4328 } 4329 } 4330 }; 4331 4332 private static final int FLYWHEEL_TIMEOUT = 40; // milliseconds 4333 4334 FlingRunnable() { 4335 mScroller = new OverScroller(getContext()); 4336 } 4337 4338 void start(int initialVelocity) { 4339 int initialY = initialVelocity < 0 ? Integer.MAX_VALUE : 0; 4340 mLastFlingY = initialY; 4341 mScroller.setInterpolator(null); 4342 mScroller.fling(0, initialY, 0, initialVelocity, 4343 0, Integer.MAX_VALUE, 0, Integer.MAX_VALUE); 4344 mTouchMode = TOUCH_MODE_FLING; 4345 postOnAnimation(this); 4346 4347 if (PROFILE_FLINGING) { 4348 if (!mFlingProfilingStarted) { 4349 Debug.startMethodTracing("AbsListViewFling"); 4350 mFlingProfilingStarted = true; 4351 } 4352 } 4353 4354 if (mFlingStrictSpan == null) { 4355 mFlingStrictSpan = StrictMode.enterCriticalSpan("AbsListView-fling"); 4356 } 4357 } 4358 4359 void startSpringback() { 4360 if (mScroller.springBack(0, mScrollY, 0, 0, 0, 0)) { 4361 mTouchMode = TOUCH_MODE_OVERFLING; 4362 invalidate(); 4363 postOnAnimation(this); 4364 } else { 4365 mTouchMode = TOUCH_MODE_REST; 4366 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 4367 } 4368 } 4369 4370 void startOverfling(int initialVelocity) { 4371 mScroller.setInterpolator(null); 4372 mScroller.fling(0, mScrollY, 0, initialVelocity, 0, 0, 4373 Integer.MIN_VALUE, Integer.MAX_VALUE, 0, getHeight()); 4374 mTouchMode = TOUCH_MODE_OVERFLING; 4375 invalidate(); 4376 postOnAnimation(this); 4377 } 4378 4379 void edgeReached(int delta) { 4380 mScroller.notifyVerticalEdgeReached(mScrollY, 0, mOverflingDistance); 4381 final int overscrollMode = getOverScrollMode(); 4382 if (overscrollMode == OVER_SCROLL_ALWAYS || 4383 (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) { 4384 mTouchMode = TOUCH_MODE_OVERFLING; 4385 final int vel = (int) mScroller.getCurrVelocity(); 4386 if (delta > 0) { 4387 mEdgeGlowTop.onAbsorb(vel); 4388 } else { 4389 mEdgeGlowBottom.onAbsorb(vel); 4390 } 4391 } else { 4392 mTouchMode = TOUCH_MODE_REST; 4393 if (mPositionScroller != null) { 4394 mPositionScroller.stop(); 4395 } 4396 } 4397 invalidate(); 4398 postOnAnimation(this); 4399 } 4400 4401 void startScroll(int distance, int duration, boolean linear) { 4402 int initialY = distance < 0 ? Integer.MAX_VALUE : 0; 4403 mLastFlingY = initialY; 4404 mScroller.setInterpolator(linear ? sLinearInterpolator : null); 4405 mScroller.startScroll(0, initialY, 0, distance, duration); 4406 mTouchMode = TOUCH_MODE_FLING; 4407 postOnAnimation(this); 4408 } 4409 4410 void endFling() { 4411 mTouchMode = TOUCH_MODE_REST; 4412 4413 removeCallbacks(this); 4414 removeCallbacks(mCheckFlywheel); 4415 4416 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 4417 clearScrollingCache(); 4418 mScroller.abortAnimation(); 4419 4420 if (mFlingStrictSpan != null) { 4421 mFlingStrictSpan.finish(); 4422 mFlingStrictSpan = null; 4423 } 4424 } 4425 4426 void flywheelTouch() { 4427 postDelayed(mCheckFlywheel, FLYWHEEL_TIMEOUT); 4428 } 4429 4430 @Override 4431 public void run() { 4432 switch (mTouchMode) { 4433 default: 4434 endFling(); 4435 return; 4436 4437 case TOUCH_MODE_SCROLL: 4438 if (mScroller.isFinished()) { 4439 return; 4440 } 4441 // Fall through 4442 case TOUCH_MODE_FLING: { 4443 if (mDataChanged) { 4444 layoutChildren(); 4445 } 4446 4447 if (mItemCount == 0 || getChildCount() == 0) { 4448 endFling(); 4449 return; 4450 } 4451 4452 final OverScroller scroller = mScroller; 4453 boolean more = scroller.computeScrollOffset(); 4454 final int y = scroller.getCurrY(); 4455 4456 // Flip sign to convert finger direction to list items direction 4457 // (e.g. finger moving down means list is moving towards the top) 4458 int delta = mLastFlingY - y; 4459 4460 // Pretend that each frame of a fling scroll is a touch scroll 4461 if (delta > 0) { 4462 // List is moving towards the top. Use first view as mMotionPosition 4463 mMotionPosition = mFirstPosition; 4464 final View firstView = getChildAt(0); 4465 mMotionViewOriginalTop = firstView.getTop(); 4466 4467 // Don't fling more than 1 screen 4468 delta = Math.min(getHeight() - mPaddingBottom - mPaddingTop - 1, delta); 4469 } else { 4470 // List is moving towards the bottom. Use last view as mMotionPosition 4471 int offsetToLast = getChildCount() - 1; 4472 mMotionPosition = mFirstPosition + offsetToLast; 4473 4474 final View lastView = getChildAt(offsetToLast); 4475 mMotionViewOriginalTop = lastView.getTop(); 4476 4477 // Don't fling more than 1 screen 4478 delta = Math.max(-(getHeight() - mPaddingBottom - mPaddingTop - 1), delta); 4479 } 4480 4481 // Check to see if we have bumped into the scroll limit 4482 View motionView = getChildAt(mMotionPosition - mFirstPosition); 4483 int oldTop = 0; 4484 if (motionView != null) { 4485 oldTop = motionView.getTop(); 4486 } 4487 4488 // Don't stop just because delta is zero (it could have been rounded) 4489 final boolean atEdge = trackMotionScroll(delta, delta); 4490 final boolean atEnd = atEdge && (delta != 0); 4491 if (atEnd) { 4492 if (motionView != null) { 4493 // Tweak the scroll for how far we overshot 4494 int overshoot = -(delta - (motionView.getTop() - oldTop)); 4495 overScrollBy(0, overshoot, 0, mScrollY, 0, 0, 4496 0, mOverflingDistance, false); 4497 } 4498 if (more) { 4499 edgeReached(delta); 4500 } 4501 break; 4502 } 4503 4504 if (more && !atEnd) { 4505 if (atEdge) invalidate(); 4506 mLastFlingY = y; 4507 postOnAnimation(this); 4508 } else { 4509 endFling(); 4510 4511 if (PROFILE_FLINGING) { 4512 if (mFlingProfilingStarted) { 4513 Debug.stopMethodTracing(); 4514 mFlingProfilingStarted = false; 4515 } 4516 4517 if (mFlingStrictSpan != null) { 4518 mFlingStrictSpan.finish(); 4519 mFlingStrictSpan = null; 4520 } 4521 } 4522 } 4523 break; 4524 } 4525 4526 case TOUCH_MODE_OVERFLING: { 4527 final OverScroller scroller = mScroller; 4528 if (scroller.computeScrollOffset()) { 4529 final int scrollY = mScrollY; 4530 final int currY = scroller.getCurrY(); 4531 final int deltaY = currY - scrollY; 4532 if (overScrollBy(0, deltaY, 0, scrollY, 0, 0, 4533 0, mOverflingDistance, false)) { 4534 final boolean crossDown = scrollY <= 0 && currY > 0; 4535 final boolean crossUp = scrollY >= 0 && currY < 0; 4536 if (crossDown || crossUp) { 4537 int velocity = (int) scroller.getCurrVelocity(); 4538 if (crossUp) velocity = -velocity; 4539 4540 // Don't flywheel from this; we're just continuing things. 4541 scroller.abortAnimation(); 4542 start(velocity); 4543 } else { 4544 startSpringback(); 4545 } 4546 } else { 4547 invalidate(); 4548 postOnAnimation(this); 4549 } 4550 } else { 4551 endFling(); 4552 } 4553 break; 4554 } 4555 } 4556 } 4557 } 4558 4559 /** 4560 * The amount of friction applied to flings. The default value 4561 * is {@link ViewConfiguration#getScrollFriction}. 4562 */ 4563 public void setFriction(float friction) { 4564 if (mFlingRunnable == null) { 4565 mFlingRunnable = new FlingRunnable(); 4566 } 4567 mFlingRunnable.mScroller.setFriction(friction); 4568 } 4569 4570 /** 4571 * Sets a scale factor for the fling velocity. The initial scale 4572 * factor is 1.0. 4573 * 4574 * @param scale The scale factor to multiply the velocity by. 4575 */ 4576 public void setVelocityScale(float scale) { 4577 mVelocityScale = scale; 4578 } 4579 4580 /** 4581 * Override this for better control over position scrolling. 4582 */ 4583 AbsPositionScroller createPositionScroller() { 4584 return new PositionScroller(); 4585 } 4586 4587 /** 4588 * Smoothly scroll to the specified adapter position. The view will 4589 * scroll such that the indicated position is displayed. 4590 * @param position Scroll to this adapter position. 4591 */ 4592 public void smoothScrollToPosition(int position) { 4593 if (mPositionScroller == null) { 4594 mPositionScroller = createPositionScroller(); 4595 } 4596 mPositionScroller.start(position); 4597 } 4598 4599 /** 4600 * Smoothly scroll to the specified adapter position. The view will scroll 4601 * such that the indicated position is displayed <code>offset</code> pixels below 4602 * the top edge of the view. If this is impossible, (e.g. the offset would scroll 4603 * the first or last item beyond the boundaries of the list) it will get as close 4604 * as possible. The scroll will take <code>duration</code> milliseconds to complete. 4605 * 4606 * @param position Position to scroll to 4607 * @param offset Desired distance in pixels of <code>position</code> from the top 4608 * of the view when scrolling is finished 4609 * @param duration Number of milliseconds to use for the scroll 4610 */ 4611 public void smoothScrollToPositionFromTop(int position, int offset, int duration) { 4612 if (mPositionScroller == null) { 4613 mPositionScroller = createPositionScroller(); 4614 } 4615 mPositionScroller.startWithOffset(position, offset, duration); 4616 } 4617 4618 /** 4619 * Smoothly scroll to the specified adapter position. The view will scroll 4620 * such that the indicated position is displayed <code>offset</code> pixels below 4621 * the top edge of the view. If this is impossible, (e.g. the offset would scroll 4622 * the first or last item beyond the boundaries of the list) it will get as close 4623 * as possible. 4624 * 4625 * @param position Position to scroll to 4626 * @param offset Desired distance in pixels of <code>position</code> from the top 4627 * of the view when scrolling is finished 4628 */ 4629 public void smoothScrollToPositionFromTop(int position, int offset) { 4630 if (mPositionScroller == null) { 4631 mPositionScroller = createPositionScroller(); 4632 } 4633 mPositionScroller.startWithOffset(position, offset, offset); 4634 } 4635 4636 /** 4637 * Smoothly scroll to the specified adapter position. The view will 4638 * scroll such that the indicated position is displayed, but it will 4639 * stop early if scrolling further would scroll boundPosition out of 4640 * view. 4641 * 4642 * @param position Scroll to this adapter position. 4643 * @param boundPosition Do not scroll if it would move this adapter 4644 * position out of view. 4645 */ 4646 public void smoothScrollToPosition(int position, int boundPosition) { 4647 if (mPositionScroller == null) { 4648 mPositionScroller = createPositionScroller(); 4649 } 4650 mPositionScroller.start(position, boundPosition); 4651 } 4652 4653 /** 4654 * Smoothly scroll by distance pixels over duration milliseconds. 4655 * @param distance Distance to scroll in pixels. 4656 * @param duration Duration of the scroll animation in milliseconds. 4657 */ 4658 public void smoothScrollBy(int distance, int duration) { 4659 smoothScrollBy(distance, duration, false); 4660 } 4661 4662 void smoothScrollBy(int distance, int duration, boolean linear) { 4663 if (mFlingRunnable == null) { 4664 mFlingRunnable = new FlingRunnable(); 4665 } 4666 4667 // No sense starting to scroll if we're not going anywhere 4668 final int firstPos = mFirstPosition; 4669 final int childCount = getChildCount(); 4670 final int lastPos = firstPos + childCount; 4671 final int topLimit = getPaddingTop(); 4672 final int bottomLimit = getHeight() - getPaddingBottom(); 4673 4674 if (distance == 0 || mItemCount == 0 || childCount == 0 || 4675 (firstPos == 0 && getChildAt(0).getTop() == topLimit && distance < 0) || 4676 (lastPos == mItemCount && 4677 getChildAt(childCount - 1).getBottom() == bottomLimit && distance > 0)) { 4678 mFlingRunnable.endFling(); 4679 if (mPositionScroller != null) { 4680 mPositionScroller.stop(); 4681 } 4682 } else { 4683 reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); 4684 mFlingRunnable.startScroll(distance, duration, linear); 4685 } 4686 } 4687 4688 /** 4689 * Allows RemoteViews to scroll relatively to a position. 4690 */ 4691 void smoothScrollByOffset(int position) { 4692 int index = -1; 4693 if (position < 0) { 4694 index = getFirstVisiblePosition(); 4695 } else if (position > 0) { 4696 index = getLastVisiblePosition(); 4697 } 4698 4699 if (index > -1) { 4700 View child = getChildAt(index - getFirstVisiblePosition()); 4701 if (child != null) { 4702 Rect visibleRect = new Rect(); 4703 if (child.getGlobalVisibleRect(visibleRect)) { 4704 // the child is partially visible 4705 int childRectArea = child.getWidth() * child.getHeight(); 4706 int visibleRectArea = visibleRect.width() * visibleRect.height(); 4707 float visibleArea = (visibleRectArea / (float) childRectArea); 4708 final float visibleThreshold = 0.75f; 4709 if ((position < 0) && (visibleArea < visibleThreshold)) { 4710 // the top index is not perceivably visible so offset 4711 // to account for showing that top index as well 4712 ++index; 4713 } else if ((position > 0) && (visibleArea < visibleThreshold)) { 4714 // the bottom index is not perceivably visible so offset 4715 // to account for showing that bottom index as well 4716 --index; 4717 } 4718 } 4719 smoothScrollToPosition(Math.max(0, Math.min(getCount(), index + position))); 4720 } 4721 } 4722 } 4723 4724 private void createScrollingCache() { 4725 if (mScrollingCacheEnabled && !mCachingStarted && !isHardwareAccelerated()) { 4726 setChildrenDrawnWithCacheEnabled(true); 4727 setChildrenDrawingCacheEnabled(true); 4728 mCachingStarted = mCachingActive = true; 4729 } 4730 } 4731 4732 private void clearScrollingCache() { 4733 if (!isHardwareAccelerated()) { 4734 if (mClearScrollingCache == null) { 4735 mClearScrollingCache = new Runnable() { 4736 @Override 4737 public void run() { 4738 if (mCachingStarted) { 4739 mCachingStarted = mCachingActive = false; 4740 setChildrenDrawnWithCacheEnabled(false); 4741 if ((mPersistentDrawingCache & PERSISTENT_SCROLLING_CACHE) == 0) { 4742 setChildrenDrawingCacheEnabled(false); 4743 } 4744 if (!isAlwaysDrawnWithCacheEnabled()) { 4745 invalidate(); 4746 } 4747 } 4748 } 4749 }; 4750 } 4751 post(mClearScrollingCache); 4752 } 4753 } 4754 4755 /** 4756 * Scrolls the list items within the view by a specified number of pixels. 4757 * 4758 * @param y the amount of pixels to scroll by vertically 4759 * @see #canScrollList(int) 4760 */ 4761 public void scrollListBy(int y) { 4762 trackMotionScroll(-y, -y); 4763 } 4764 4765 /** 4766 * Check if the items in the list can be scrolled in a certain direction. 4767 * 4768 * @param direction Negative to check scrolling up, positive to check 4769 * scrolling down. 4770 * @return true if the list can be scrolled in the specified direction, 4771 * false otherwise. 4772 * @see #scrollListBy(int) 4773 */ 4774 public boolean canScrollList(int direction) { 4775 final int childCount = getChildCount(); 4776 if (childCount == 0) { 4777 return false; 4778 } 4779 4780 final int firstPosition = mFirstPosition; 4781 final Rect listPadding = mListPadding; 4782 if (direction > 0) { 4783 final int lastBottom = getChildAt(childCount - 1).getBottom(); 4784 final int lastPosition = firstPosition + childCount; 4785 return lastPosition < mItemCount || lastBottom > getHeight() - listPadding.bottom; 4786 } else { 4787 final int firstTop = getChildAt(0).getTop(); 4788 return firstPosition > 0 || firstTop < listPadding.top; 4789 } 4790 } 4791 4792 /** 4793 * Track a motion scroll 4794 * 4795 * @param deltaY Amount to offset mMotionView. This is the accumulated delta since the motion 4796 * began. Positive numbers mean the user's finger is moving down the screen. 4797 * @param incrementalDeltaY Change in deltaY from the previous event. 4798 * @return true if we're already at the beginning/end of the list and have nothing to do. 4799 */ 4800 boolean trackMotionScroll(int deltaY, int incrementalDeltaY) { 4801 final int childCount = getChildCount(); 4802 if (childCount == 0) { 4803 return true; 4804 } 4805 4806 final int firstTop = getChildAt(0).getTop(); 4807 final int lastBottom = getChildAt(childCount - 1).getBottom(); 4808 4809 final Rect listPadding = mListPadding; 4810 4811 // "effective padding" In this case is the amount of padding that affects 4812 // how much space should not be filled by items. If we don't clip to padding 4813 // there is no effective padding. 4814 int effectivePaddingTop = 0; 4815 int effectivePaddingBottom = 0; 4816 if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 4817 effectivePaddingTop = listPadding.top; 4818 effectivePaddingBottom = listPadding.bottom; 4819 } 4820 4821 // FIXME account for grid vertical spacing too? 4822 final int spaceAbove = effectivePaddingTop - firstTop; 4823 final int end = getHeight() - effectivePaddingBottom; 4824 final int spaceBelow = lastBottom - end; 4825 4826 final int height = getHeight() - mPaddingBottom - mPaddingTop; 4827 if (deltaY < 0) { 4828 deltaY = Math.max(-(height - 1), deltaY); 4829 } else { 4830 deltaY = Math.min(height - 1, deltaY); 4831 } 4832 4833 if (incrementalDeltaY < 0) { 4834 incrementalDeltaY = Math.max(-(height - 1), incrementalDeltaY); 4835 } else { 4836 incrementalDeltaY = Math.min(height - 1, incrementalDeltaY); 4837 } 4838 4839 final int firstPosition = mFirstPosition; 4840 4841 // Update our guesses for where the first and last views are 4842 if (firstPosition == 0) { 4843 mFirstPositionDistanceGuess = firstTop - listPadding.top; 4844 } else { 4845 mFirstPositionDistanceGuess += incrementalDeltaY; 4846 } 4847 if (firstPosition + childCount == mItemCount) { 4848 mLastPositionDistanceGuess = lastBottom + listPadding.bottom; 4849 } else { 4850 mLastPositionDistanceGuess += incrementalDeltaY; 4851 } 4852 4853 final boolean cannotScrollDown = (firstPosition == 0 && 4854 firstTop >= listPadding.top && incrementalDeltaY >= 0); 4855 final boolean cannotScrollUp = (firstPosition + childCount == mItemCount && 4856 lastBottom <= getHeight() - listPadding.bottom && incrementalDeltaY <= 0); 4857 4858 if (cannotScrollDown || cannotScrollUp) { 4859 return incrementalDeltaY != 0; 4860 } 4861 4862 final boolean down = incrementalDeltaY < 0; 4863 4864 final boolean inTouchMode = isInTouchMode(); 4865 if (inTouchMode) { 4866 hideSelector(); 4867 } 4868 4869 final int headerViewsCount = getHeaderViewsCount(); 4870 final int footerViewsStart = mItemCount - getFooterViewsCount(); 4871 4872 int start = 0; 4873 int count = 0; 4874 4875 if (down) { 4876 int top = -incrementalDeltaY; 4877 if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 4878 top += listPadding.top; 4879 } 4880 for (int i = 0; i < childCount; i++) { 4881 final View child = getChildAt(i); 4882 if (child.getBottom() >= top) { 4883 break; 4884 } else { 4885 count++; 4886 int position = firstPosition + i; 4887 if (position >= headerViewsCount && position < footerViewsStart) { 4888 // The view will be rebound to new data, clear any 4889 // system-managed transient state. 4890 if (child.isAccessibilityFocused()) { 4891 child.clearAccessibilityFocus(); 4892 } 4893 mRecycler.addScrapView(child, position); 4894 } 4895 } 4896 } 4897 } else { 4898 int bottom = getHeight() - incrementalDeltaY; 4899 if ((mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 4900 bottom -= listPadding.bottom; 4901 } 4902 for (int i = childCount - 1; i >= 0; i--) { 4903 final View child = getChildAt(i); 4904 if (child.getTop() <= bottom) { 4905 break; 4906 } else { 4907 start = i; 4908 count++; 4909 int position = firstPosition + i; 4910 if (position >= headerViewsCount && position < footerViewsStart) { 4911 // The view will be rebound to new data, clear any 4912 // system-managed transient state. 4913 if (child.isAccessibilityFocused()) { 4914 child.clearAccessibilityFocus(); 4915 } 4916 mRecycler.addScrapView(child, position); 4917 } 4918 } 4919 } 4920 } 4921 4922 mMotionViewNewTop = mMotionViewOriginalTop + deltaY; 4923 4924 mBlockLayoutRequests = true; 4925 4926 if (count > 0) { 4927 detachViewsFromParent(start, count); 4928 mRecycler.removeSkippedScrap(); 4929 } 4930 4931 // invalidate before moving the children to avoid unnecessary invalidate 4932 // calls to bubble up from the children all the way to the top 4933 if (!awakenScrollBars()) { 4934 invalidate(); 4935 } 4936 4937 offsetChildrenTopAndBottom(incrementalDeltaY); 4938 4939 if (down) { 4940 mFirstPosition += count; 4941 } 4942 4943 final int absIncrementalDeltaY = Math.abs(incrementalDeltaY); 4944 if (spaceAbove < absIncrementalDeltaY || spaceBelow < absIncrementalDeltaY) { 4945 fillGap(down); 4946 } 4947 4948 if (!inTouchMode && mSelectedPosition != INVALID_POSITION) { 4949 final int childIndex = mSelectedPosition - mFirstPosition; 4950 if (childIndex >= 0 && childIndex < getChildCount()) { 4951 positionSelector(mSelectedPosition, getChildAt(childIndex)); 4952 } 4953 } else if (mSelectorPosition != INVALID_POSITION) { 4954 final int childIndex = mSelectorPosition - mFirstPosition; 4955 if (childIndex >= 0 && childIndex < getChildCount()) { 4956 positionSelector(INVALID_POSITION, getChildAt(childIndex)); 4957 } 4958 } else { 4959 mSelectorRect.setEmpty(); 4960 } 4961 4962 mBlockLayoutRequests = false; 4963 4964 invokeOnItemScrollListener(); 4965 4966 return false; 4967 } 4968 4969 /** 4970 * Returns the number of header views in the list. Header views are special views 4971 * at the top of the list that should not be recycled during a layout. 4972 * 4973 * @return The number of header views, 0 in the default implementation. 4974 */ 4975 int getHeaderViewsCount() { 4976 return 0; 4977 } 4978 4979 /** 4980 * Returns the number of footer views in the list. Footer views are special views 4981 * at the bottom of the list that should not be recycled during a layout. 4982 * 4983 * @return The number of footer views, 0 in the default implementation. 4984 */ 4985 int getFooterViewsCount() { 4986 return 0; 4987 } 4988 4989 /** 4990 * Fills the gap left open by a touch-scroll. During a touch scroll, children that 4991 * remain on screen are shifted and the other ones are discarded. The role of this 4992 * method is to fill the gap thus created by performing a partial layout in the 4993 * empty space. 4994 * 4995 * @param down true if the scroll is going down, false if it is going up 4996 */ 4997 abstract void fillGap(boolean down); 4998 4999 void hideSelector() { 5000 if (mSelectedPosition != INVALID_POSITION) { 5001 if (mLayoutMode != LAYOUT_SPECIFIC) { 5002 mResurrectToPosition = mSelectedPosition; 5003 } 5004 if (mNextSelectedPosition >= 0 && mNextSelectedPosition != mSelectedPosition) { 5005 mResurrectToPosition = mNextSelectedPosition; 5006 } 5007 setSelectedPositionInt(INVALID_POSITION); 5008 setNextSelectedPositionInt(INVALID_POSITION); 5009 mSelectedTop = 0; 5010 } 5011 } 5012 5013 /** 5014 * @return A position to select. First we try mSelectedPosition. If that has been clobbered by 5015 * entering touch mode, we then try mResurrectToPosition. Values are pinned to the range 5016 * of items available in the adapter 5017 */ 5018 int reconcileSelectedPosition() { 5019 int position = mSelectedPosition; 5020 if (position < 0) { 5021 position = mResurrectToPosition; 5022 } 5023 position = Math.max(0, position); 5024 position = Math.min(position, mItemCount - 1); 5025 return position; 5026 } 5027 5028 /** 5029 * Find the row closest to y. This row will be used as the motion row when scrolling 5030 * 5031 * @param y Where the user touched 5032 * @return The position of the first (or only) item in the row containing y 5033 */ 5034 abstract int findMotionRow(int y); 5035 5036 /** 5037 * Find the row closest to y. This row will be used as the motion row when scrolling. 5038 * 5039 * @param y Where the user touched 5040 * @return The position of the first (or only) item in the row closest to y 5041 */ 5042 int findClosestMotionRow(int y) { 5043 final int childCount = getChildCount(); 5044 if (childCount == 0) { 5045 return INVALID_POSITION; 5046 } 5047 5048 final int motionRow = findMotionRow(y); 5049 return motionRow != INVALID_POSITION ? motionRow : mFirstPosition + childCount - 1; 5050 } 5051 5052 /** 5053 * Causes all the views to be rebuilt and redrawn. 5054 */ 5055 public void invalidateViews() { 5056 mDataChanged = true; 5057 rememberSyncState(); 5058 requestLayout(); 5059 invalidate(); 5060 } 5061 5062 /** 5063 * If there is a selection returns false. 5064 * Otherwise resurrects the selection and returns true if resurrected. 5065 */ 5066 boolean resurrectSelectionIfNeeded() { 5067 if (mSelectedPosition < 0 && resurrectSelection()) { 5068 updateSelectorState(); 5069 return true; 5070 } 5071 return false; 5072 } 5073 5074 /** 5075 * Makes the item at the supplied position selected. 5076 * 5077 * @param position the position of the new selection 5078 */ 5079 abstract void setSelectionInt(int position); 5080 5081 /** 5082 * Attempt to bring the selection back if the user is switching from touch 5083 * to trackball mode 5084 * @return Whether selection was set to something. 5085 */ 5086 boolean resurrectSelection() { 5087 final int childCount = getChildCount(); 5088 5089 if (childCount <= 0) { 5090 return false; 5091 } 5092 5093 int selectedTop = 0; 5094 int selectedPos; 5095 int childrenTop = mListPadding.top; 5096 int childrenBottom = mBottom - mTop - mListPadding.bottom; 5097 final int firstPosition = mFirstPosition; 5098 final int toPosition = mResurrectToPosition; 5099 boolean down = true; 5100 5101 if (toPosition >= firstPosition && toPosition < firstPosition + childCount) { 5102 selectedPos = toPosition; 5103 5104 final View selected = getChildAt(selectedPos - mFirstPosition); 5105 selectedTop = selected.getTop(); 5106 int selectedBottom = selected.getBottom(); 5107 5108 // We are scrolled, don't get in the fade 5109 if (selectedTop < childrenTop) { 5110 selectedTop = childrenTop + getVerticalFadingEdgeLength(); 5111 } else if (selectedBottom > childrenBottom) { 5112 selectedTop = childrenBottom - selected.getMeasuredHeight() 5113 - getVerticalFadingEdgeLength(); 5114 } 5115 } else { 5116 if (toPosition < firstPosition) { 5117 // Default to selecting whatever is first 5118 selectedPos = firstPosition; 5119 for (int i = 0; i < childCount; i++) { 5120 final View v = getChildAt(i); 5121 final int top = v.getTop(); 5122 5123 if (i == 0) { 5124 // Remember the position of the first item 5125 selectedTop = top; 5126 // See if we are scrolled at all 5127 if (firstPosition > 0 || top < childrenTop) { 5128 // If we are scrolled, don't select anything that is 5129 // in the fade region 5130 childrenTop += getVerticalFadingEdgeLength(); 5131 } 5132 } 5133 if (top >= childrenTop) { 5134 // Found a view whose top is fully visisble 5135 selectedPos = firstPosition + i; 5136 selectedTop = top; 5137 break; 5138 } 5139 } 5140 } else { 5141 final int itemCount = mItemCount; 5142 down = false; 5143 selectedPos = firstPosition + childCount - 1; 5144 5145 for (int i = childCount - 1; i >= 0; i--) { 5146 final View v = getChildAt(i); 5147 final int top = v.getTop(); 5148 final int bottom = v.getBottom(); 5149 5150 if (i == childCount - 1) { 5151 selectedTop = top; 5152 if (firstPosition + childCount < itemCount || bottom > childrenBottom) { 5153 childrenBottom -= getVerticalFadingEdgeLength(); 5154 } 5155 } 5156 5157 if (bottom <= childrenBottom) { 5158 selectedPos = firstPosition + i; 5159 selectedTop = top; 5160 break; 5161 } 5162 } 5163 } 5164 } 5165 5166 mResurrectToPosition = INVALID_POSITION; 5167 removeCallbacks(mFlingRunnable); 5168 if (mPositionScroller != null) { 5169 mPositionScroller.stop(); 5170 } 5171 mTouchMode = TOUCH_MODE_REST; 5172 clearScrollingCache(); 5173 mSpecificTop = selectedTop; 5174 selectedPos = lookForSelectablePosition(selectedPos, down); 5175 if (selectedPos >= firstPosition && selectedPos <= getLastVisiblePosition()) { 5176 mLayoutMode = LAYOUT_SPECIFIC; 5177 updateSelectorState(); 5178 setSelectionInt(selectedPos); 5179 invokeOnItemScrollListener(); 5180 } else { 5181 selectedPos = INVALID_POSITION; 5182 } 5183 reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); 5184 5185 return selectedPos >= 0; 5186 } 5187 5188 void confirmCheckedPositionsById() { 5189 // Clear out the positional check states, we'll rebuild it below from IDs. 5190 mCheckStates.clear(); 5191 5192 boolean checkedCountChanged = false; 5193 for (int checkedIndex = 0; checkedIndex < mCheckedIdStates.size(); checkedIndex++) { 5194 final long id = mCheckedIdStates.keyAt(checkedIndex); 5195 final int lastPos = mCheckedIdStates.valueAt(checkedIndex); 5196 5197 final long lastPosId = mAdapter.getItemId(lastPos); 5198 if (id != lastPosId) { 5199 // Look around to see if the ID is nearby. If not, uncheck it. 5200 final int start = Math.max(0, lastPos - CHECK_POSITION_SEARCH_DISTANCE); 5201 final int end = Math.min(lastPos + CHECK_POSITION_SEARCH_DISTANCE, mItemCount); 5202 boolean found = false; 5203 for (int searchPos = start; searchPos < end; searchPos++) { 5204 final long searchId = mAdapter.getItemId(searchPos); 5205 if (id == searchId) { 5206 found = true; 5207 mCheckStates.put(searchPos, true); 5208 mCheckedIdStates.setValueAt(checkedIndex, searchPos); 5209 break; 5210 } 5211 } 5212 5213 if (!found) { 5214 mCheckedIdStates.delete(id); 5215 checkedIndex--; 5216 mCheckedItemCount--; 5217 checkedCountChanged = true; 5218 if (mChoiceActionMode != null && mMultiChoiceModeCallback != null) { 5219 mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, 5220 lastPos, id, false); 5221 } 5222 } 5223 } else { 5224 mCheckStates.put(lastPos, true); 5225 } 5226 } 5227 5228 if (checkedCountChanged && mChoiceActionMode != null) { 5229 mChoiceActionMode.invalidate(); 5230 } 5231 } 5232 5233 @Override 5234 protected void handleDataChanged() { 5235 int count = mItemCount; 5236 int lastHandledItemCount = mLastHandledItemCount; 5237 mLastHandledItemCount = mItemCount; 5238 5239 if (mChoiceMode != CHOICE_MODE_NONE && mAdapter != null && mAdapter.hasStableIds()) { 5240 confirmCheckedPositionsById(); 5241 } 5242 5243 // TODO: In the future we can recycle these views based on stable ID instead. 5244 mRecycler.clearTransientStateViews(); 5245 5246 if (count > 0) { 5247 int newPos; 5248 int selectablePos; 5249 5250 // Find the row we are supposed to sync to 5251 if (mNeedSync) { 5252 // Update this first, since setNextSelectedPositionInt inspects it 5253 mNeedSync = false; 5254 mPendingSync = null; 5255 5256 if (mTranscriptMode == TRANSCRIPT_MODE_ALWAYS_SCROLL) { 5257 mLayoutMode = LAYOUT_FORCE_BOTTOM; 5258 return; 5259 } else if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) { 5260 if (mForceTranscriptScroll) { 5261 mForceTranscriptScroll = false; 5262 mLayoutMode = LAYOUT_FORCE_BOTTOM; 5263 return; 5264 } 5265 final int childCount = getChildCount(); 5266 final int listBottom = getHeight() - getPaddingBottom(); 5267 final View lastChild = getChildAt(childCount - 1); 5268 final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom; 5269 if (mFirstPosition + childCount >= lastHandledItemCount && 5270 lastBottom <= listBottom) { 5271 mLayoutMode = LAYOUT_FORCE_BOTTOM; 5272 return; 5273 } 5274 // Something new came in and we didn't scroll; give the user a clue that 5275 // there's something new. 5276 awakenScrollBars(); 5277 } 5278 5279 switch (mSyncMode) { 5280 case SYNC_SELECTED_POSITION: 5281 if (isInTouchMode()) { 5282 // We saved our state when not in touch mode. (We know this because 5283 // mSyncMode is SYNC_SELECTED_POSITION.) Now we are trying to 5284 // restore in touch mode. Just leave mSyncPosition as it is (possibly 5285 // adjusting if the available range changed) and return. 5286 mLayoutMode = LAYOUT_SYNC; 5287 mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1); 5288 5289 return; 5290 } else { 5291 // See if we can find a position in the new data with the same 5292 // id as the old selection. This will change mSyncPosition. 5293 newPos = findSyncPosition(); 5294 if (newPos >= 0) { 5295 // Found it. Now verify that new selection is still selectable 5296 selectablePos = lookForSelectablePosition(newPos, true); 5297 if (selectablePos == newPos) { 5298 // Same row id is selected 5299 mSyncPosition = newPos; 5300 5301 if (mSyncHeight == getHeight()) { 5302 // If we are at the same height as when we saved state, try 5303 // to restore the scroll position too. 5304 mLayoutMode = LAYOUT_SYNC; 5305 } else { 5306 // We are not the same height as when the selection was saved, so 5307 // don't try to restore the exact position 5308 mLayoutMode = LAYOUT_SET_SELECTION; 5309 } 5310 5311 // Restore selection 5312 setNextSelectedPositionInt(newPos); 5313 return; 5314 } 5315 } 5316 } 5317 break; 5318 case SYNC_FIRST_POSITION: 5319 // Leave mSyncPosition as it is -- just pin to available range 5320 mLayoutMode = LAYOUT_SYNC; 5321 mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1); 5322 5323 return; 5324 } 5325 } 5326 5327 if (!isInTouchMode()) { 5328 // We couldn't find matching data -- try to use the same position 5329 newPos = getSelectedItemPosition(); 5330 5331 // Pin position to the available range 5332 if (newPos >= count) { 5333 newPos = count - 1; 5334 } 5335 if (newPos < 0) { 5336 newPos = 0; 5337 } 5338 5339 // Make sure we select something selectable -- first look down 5340 selectablePos = lookForSelectablePosition(newPos, true); 5341 5342 if (selectablePos >= 0) { 5343 setNextSelectedPositionInt(selectablePos); 5344 return; 5345 } else { 5346 // Looking down didn't work -- try looking up 5347 selectablePos = lookForSelectablePosition(newPos, false); 5348 if (selectablePos >= 0) { 5349 setNextSelectedPositionInt(selectablePos); 5350 return; 5351 } 5352 } 5353 } else { 5354 5355 // We already know where we want to resurrect the selection 5356 if (mResurrectToPosition >= 0) { 5357 return; 5358 } 5359 } 5360 5361 } 5362 5363 // Nothing is selected. Give up and reset everything. 5364 mLayoutMode = mStackFromBottom ? LAYOUT_FORCE_BOTTOM : LAYOUT_FORCE_TOP; 5365 mSelectedPosition = INVALID_POSITION; 5366 mSelectedRowId = INVALID_ROW_ID; 5367 mNextSelectedPosition = INVALID_POSITION; 5368 mNextSelectedRowId = INVALID_ROW_ID; 5369 mNeedSync = false; 5370 mPendingSync = null; 5371 mSelectorPosition = INVALID_POSITION; 5372 checkSelectionChanged(); 5373 } 5374 5375 @Override 5376 protected void onDisplayHint(int hint) { 5377 super.onDisplayHint(hint); 5378 switch (hint) { 5379 case INVISIBLE: 5380 if (mPopup != null && mPopup.isShowing()) { 5381 dismissPopup(); 5382 } 5383 break; 5384 case VISIBLE: 5385 if (mFiltered && mPopup != null && !mPopup.isShowing()) { 5386 showPopup(); 5387 } 5388 break; 5389 } 5390 mPopupHidden = hint == INVISIBLE; 5391 } 5392 5393 /** 5394 * Removes the filter window 5395 */ 5396 private void dismissPopup() { 5397 if (mPopup != null) { 5398 mPopup.dismiss(); 5399 } 5400 } 5401 5402 /** 5403 * Shows the filter window 5404 */ 5405 private void showPopup() { 5406 // Make sure we have a window before showing the popup 5407 if (getWindowVisibility() == View.VISIBLE) { 5408 createTextFilter(true); 5409 positionPopup(); 5410 // Make sure we get focus if we are showing the popup 5411 checkFocus(); 5412 } 5413 } 5414 5415 private void positionPopup() { 5416 int screenHeight = getResources().getDisplayMetrics().heightPixels; 5417 final int[] xy = new int[2]; 5418 getLocationOnScreen(xy); 5419 // TODO: The 20 below should come from the theme 5420 // TODO: And the gravity should be defined in the theme as well 5421 final int bottomGap = screenHeight - xy[1] - getHeight() + (int) (mDensityScale * 20); 5422 if (!mPopup.isShowing()) { 5423 mPopup.showAtLocation(this, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 5424 xy[0], bottomGap); 5425 } else { 5426 mPopup.update(xy[0], bottomGap, -1, -1); 5427 } 5428 } 5429 5430 /** 5431 * What is the distance between the source and destination rectangles given the direction of 5432 * focus navigation between them? The direction basically helps figure out more quickly what is 5433 * self evident by the relationship between the rects... 5434 * 5435 * @param source the source rectangle 5436 * @param dest the destination rectangle 5437 * @param direction the direction 5438 * @return the distance between the rectangles 5439 */ 5440 static int getDistance(Rect source, Rect dest, int direction) { 5441 int sX, sY; // source x, y 5442 int dX, dY; // dest x, y 5443 switch (direction) { 5444 case View.FOCUS_RIGHT: 5445 sX = source.right; 5446 sY = source.top + source.height() / 2; 5447 dX = dest.left; 5448 dY = dest.top + dest.height() / 2; 5449 break; 5450 case View.FOCUS_DOWN: 5451 sX = source.left + source.width() / 2; 5452 sY = source.bottom; 5453 dX = dest.left + dest.width() / 2; 5454 dY = dest.top; 5455 break; 5456 case View.FOCUS_LEFT: 5457 sX = source.left; 5458 sY = source.top + source.height() / 2; 5459 dX = dest.right; 5460 dY = dest.top + dest.height() / 2; 5461 break; 5462 case View.FOCUS_UP: 5463 sX = source.left + source.width() / 2; 5464 sY = source.top; 5465 dX = dest.left + dest.width() / 2; 5466 dY = dest.bottom; 5467 break; 5468 case View.FOCUS_FORWARD: 5469 case View.FOCUS_BACKWARD: 5470 sX = source.right + source.width() / 2; 5471 sY = source.top + source.height() / 2; 5472 dX = dest.left + dest.width() / 2; 5473 dY = dest.top + dest.height() / 2; 5474 break; 5475 default: 5476 throw new IllegalArgumentException("direction must be one of " 5477 + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, " 5478 + "FOCUS_FORWARD, FOCUS_BACKWARD}."); 5479 } 5480 int deltaX = dX - sX; 5481 int deltaY = dY - sY; 5482 return deltaY * deltaY + deltaX * deltaX; 5483 } 5484 5485 @Override 5486 protected boolean isInFilterMode() { 5487 return mFiltered; 5488 } 5489 5490 /** 5491 * Sends a key to the text filter window 5492 * 5493 * @param keyCode The keycode for the event 5494 * @param event The actual key event 5495 * 5496 * @return True if the text filter handled the event, false otherwise. 5497 */ 5498 boolean sendToTextFilter(int keyCode, int count, KeyEvent event) { 5499 if (!acceptFilter()) { 5500 return false; 5501 } 5502 5503 boolean handled = false; 5504 boolean okToSend = true; 5505 switch (keyCode) { 5506 case KeyEvent.KEYCODE_DPAD_UP: 5507 case KeyEvent.KEYCODE_DPAD_DOWN: 5508 case KeyEvent.KEYCODE_DPAD_LEFT: 5509 case KeyEvent.KEYCODE_DPAD_RIGHT: 5510 case KeyEvent.KEYCODE_DPAD_CENTER: 5511 case KeyEvent.KEYCODE_ENTER: 5512 okToSend = false; 5513 break; 5514 case KeyEvent.KEYCODE_BACK: 5515 if (mFiltered && mPopup != null && mPopup.isShowing()) { 5516 if (event.getAction() == KeyEvent.ACTION_DOWN 5517 && event.getRepeatCount() == 0) { 5518 KeyEvent.DispatcherState state = getKeyDispatcherState(); 5519 if (state != null) { 5520 state.startTracking(event, this); 5521 } 5522 handled = true; 5523 } else if (event.getAction() == KeyEvent.ACTION_UP 5524 && event.isTracking() && !event.isCanceled()) { 5525 handled = true; 5526 mTextFilter.setText(""); 5527 } 5528 } 5529 okToSend = false; 5530 break; 5531 case KeyEvent.KEYCODE_SPACE: 5532 // Only send spaces once we are filtered 5533 okToSend = mFiltered; 5534 break; 5535 } 5536 5537 if (okToSend) { 5538 createTextFilter(true); 5539 5540 KeyEvent forwardEvent = event; 5541 if (forwardEvent.getRepeatCount() > 0) { 5542 forwardEvent = KeyEvent.changeTimeRepeat(event, event.getEventTime(), 0); 5543 } 5544 5545 int action = event.getAction(); 5546 switch (action) { 5547 case KeyEvent.ACTION_DOWN: 5548 handled = mTextFilter.onKeyDown(keyCode, forwardEvent); 5549 break; 5550 5551 case KeyEvent.ACTION_UP: 5552 handled = mTextFilter.onKeyUp(keyCode, forwardEvent); 5553 break; 5554 5555 case KeyEvent.ACTION_MULTIPLE: 5556 handled = mTextFilter.onKeyMultiple(keyCode, count, event); 5557 break; 5558 } 5559 } 5560 return handled; 5561 } 5562 5563 /** 5564 * Return an InputConnection for editing of the filter text. 5565 */ 5566 @Override 5567 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5568 if (isTextFilterEnabled()) { 5569 if (mPublicInputConnection == null) { 5570 mDefInputConnection = new BaseInputConnection(this, false); 5571 mPublicInputConnection = new InputConnectionWrapper(outAttrs); 5572 } 5573 outAttrs.inputType = EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_FILTER; 5574 outAttrs.imeOptions = EditorInfo.IME_ACTION_DONE; 5575 return mPublicInputConnection; 5576 } 5577 return null; 5578 } 5579 5580 private class InputConnectionWrapper implements InputConnection { 5581 private final EditorInfo mOutAttrs; 5582 private InputConnection mTarget; 5583 5584 public InputConnectionWrapper(EditorInfo outAttrs) { 5585 mOutAttrs = outAttrs; 5586 } 5587 5588 private InputConnection getTarget() { 5589 if (mTarget == null) { 5590 mTarget = getTextFilterInput().onCreateInputConnection(mOutAttrs); 5591 } 5592 return mTarget; 5593 } 5594 5595 @Override 5596 public boolean reportFullscreenMode(boolean enabled) { 5597 // Use our own input connection, since it is 5598 // the "real" one the IME is talking with. 5599 return mDefInputConnection.reportFullscreenMode(enabled); 5600 } 5601 5602 @Override 5603 public boolean performEditorAction(int editorAction) { 5604 // The editor is off in its own window; we need to be 5605 // the one that does this. 5606 if (editorAction == EditorInfo.IME_ACTION_DONE) { 5607 InputMethodManager imm = (InputMethodManager) 5608 getContext().getSystemService(Context.INPUT_METHOD_SERVICE); 5609 if (imm != null) { 5610 imm.hideSoftInputFromWindow(getWindowToken(), 0); 5611 } 5612 return true; 5613 } 5614 return false; 5615 } 5616 5617 @Override 5618 public boolean sendKeyEvent(KeyEvent event) { 5619 // Use our own input connection, since the filter 5620 // text view may not be shown in a window so has 5621 // no ViewAncestor to dispatch events with. 5622 return mDefInputConnection.sendKeyEvent(event); 5623 } 5624 5625 @Override 5626 public CharSequence getTextBeforeCursor(int n, int flags) { 5627 if (mTarget == null) return ""; 5628 return mTarget.getTextBeforeCursor(n, flags); 5629 } 5630 5631 @Override 5632 public CharSequence getTextAfterCursor(int n, int flags) { 5633 if (mTarget == null) return ""; 5634 return mTarget.getTextAfterCursor(n, flags); 5635 } 5636 5637 @Override 5638 public CharSequence getSelectedText(int flags) { 5639 if (mTarget == null) return ""; 5640 return mTarget.getSelectedText(flags); 5641 } 5642 5643 @Override 5644 public int getCursorCapsMode(int reqModes) { 5645 if (mTarget == null) return InputType.TYPE_TEXT_FLAG_CAP_SENTENCES; 5646 return mTarget.getCursorCapsMode(reqModes); 5647 } 5648 5649 @Override 5650 public ExtractedText getExtractedText(ExtractedTextRequest request, int flags) { 5651 return getTarget().getExtractedText(request, flags); 5652 } 5653 5654 @Override 5655 public boolean deleteSurroundingText(int beforeLength, int afterLength) { 5656 return getTarget().deleteSurroundingText(beforeLength, afterLength); 5657 } 5658 5659 @Override 5660 public boolean setComposingText(CharSequence text, int newCursorPosition) { 5661 return getTarget().setComposingText(text, newCursorPosition); 5662 } 5663 5664 @Override 5665 public boolean setComposingRegion(int start, int end) { 5666 return getTarget().setComposingRegion(start, end); 5667 } 5668 5669 @Override 5670 public boolean finishComposingText() { 5671 return mTarget == null || mTarget.finishComposingText(); 5672 } 5673 5674 @Override 5675 public boolean commitText(CharSequence text, int newCursorPosition) { 5676 return getTarget().commitText(text, newCursorPosition); 5677 } 5678 5679 @Override 5680 public boolean commitCompletion(CompletionInfo text) { 5681 return getTarget().commitCompletion(text); 5682 } 5683 5684 @Override 5685 public boolean commitCorrection(CorrectionInfo correctionInfo) { 5686 return getTarget().commitCorrection(correctionInfo); 5687 } 5688 5689 @Override 5690 public boolean setSelection(int start, int end) { 5691 return getTarget().setSelection(start, end); 5692 } 5693 5694 @Override 5695 public boolean performContextMenuAction(int id) { 5696 return getTarget().performContextMenuAction(id); 5697 } 5698 5699 @Override 5700 public boolean beginBatchEdit() { 5701 return getTarget().beginBatchEdit(); 5702 } 5703 5704 @Override 5705 public boolean endBatchEdit() { 5706 return getTarget().endBatchEdit(); 5707 } 5708 5709 @Override 5710 public boolean clearMetaKeyStates(int states) { 5711 return getTarget().clearMetaKeyStates(states); 5712 } 5713 5714 @Override 5715 public boolean performPrivateCommand(String action, Bundle data) { 5716 return getTarget().performPrivateCommand(action, data); 5717 } 5718 5719 @Override 5720 public boolean requestUpdateCursorAnchorInfo(int cursorUpdateMode) { 5721 return getTarget().requestUpdateCursorAnchorInfo(cursorUpdateMode); 5722 } 5723 } 5724 5725 /** 5726 * For filtering we proxy an input connection to an internal text editor, 5727 * and this allows the proxying to happen. 5728 */ 5729 @Override 5730 public boolean checkInputConnectionProxy(View view) { 5731 return view == mTextFilter; 5732 } 5733 5734 /** 5735 * Creates the window for the text filter and populates it with an EditText field; 5736 * 5737 * @param animateEntrance true if the window should appear with an animation 5738 */ 5739 private void createTextFilter(boolean animateEntrance) { 5740 if (mPopup == null) { 5741 PopupWindow p = new PopupWindow(getContext()); 5742 p.setFocusable(false); 5743 p.setTouchable(false); 5744 p.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED); 5745 p.setContentView(getTextFilterInput()); 5746 p.setWidth(LayoutParams.WRAP_CONTENT); 5747 p.setHeight(LayoutParams.WRAP_CONTENT); 5748 p.setBackgroundDrawable(null); 5749 mPopup = p; 5750 getViewTreeObserver().addOnGlobalLayoutListener(this); 5751 mGlobalLayoutListenerAddedFilter = true; 5752 } 5753 if (animateEntrance) { 5754 mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilter); 5755 } else { 5756 mPopup.setAnimationStyle(com.android.internal.R.style.Animation_TypingFilterRestore); 5757 } 5758 } 5759 5760 private EditText getTextFilterInput() { 5761 if (mTextFilter == null) { 5762 final LayoutInflater layoutInflater = LayoutInflater.from(getContext()); 5763 mTextFilter = (EditText) layoutInflater.inflate( 5764 com.android.internal.R.layout.typing_filter, null); 5765 // For some reason setting this as the "real" input type changes 5766 // the text view in some way that it doesn't work, and I don't 5767 // want to figure out why this is. 5768 mTextFilter.setRawInputType(EditorInfo.TYPE_CLASS_TEXT 5769 | EditorInfo.TYPE_TEXT_VARIATION_FILTER); 5770 mTextFilter.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI); 5771 mTextFilter.addTextChangedListener(this); 5772 } 5773 return mTextFilter; 5774 } 5775 5776 /** 5777 * Clear the text filter. 5778 */ 5779 public void clearTextFilter() { 5780 if (mFiltered) { 5781 getTextFilterInput().setText(""); 5782 mFiltered = false; 5783 if (mPopup != null && mPopup.isShowing()) { 5784 dismissPopup(); 5785 } 5786 } 5787 } 5788 5789 /** 5790 * Returns if the ListView currently has a text filter. 5791 */ 5792 public boolean hasTextFilter() { 5793 return mFiltered; 5794 } 5795 5796 @Override 5797 public void onGlobalLayout() { 5798 if (isShown()) { 5799 // Show the popup if we are filtered 5800 if (mFiltered && mPopup != null && !mPopup.isShowing() && !mPopupHidden) { 5801 showPopup(); 5802 } 5803 } else { 5804 // Hide the popup when we are no longer visible 5805 if (mPopup != null && mPopup.isShowing()) { 5806 dismissPopup(); 5807 } 5808 } 5809 5810 } 5811 5812 /** 5813 * For our text watcher that is associated with the text filter. Does 5814 * nothing. 5815 */ 5816 @Override 5817 public void beforeTextChanged(CharSequence s, int start, int count, int after) { 5818 } 5819 5820 /** 5821 * For our text watcher that is associated with the text filter. Performs 5822 * the actual filtering as the text changes, and takes care of hiding and 5823 * showing the popup displaying the currently entered filter text. 5824 */ 5825 @Override 5826 public void onTextChanged(CharSequence s, int start, int before, int count) { 5827 if (isTextFilterEnabled()) { 5828 createTextFilter(true); 5829 int length = s.length(); 5830 boolean showing = mPopup.isShowing(); 5831 if (!showing && length > 0) { 5832 // Show the filter popup if necessary 5833 showPopup(); 5834 mFiltered = true; 5835 } else if (showing && length == 0) { 5836 // Remove the filter popup if the user has cleared all text 5837 dismissPopup(); 5838 mFiltered = false; 5839 } 5840 if (mAdapter instanceof Filterable) { 5841 Filter f = ((Filterable) mAdapter).getFilter(); 5842 // Filter should not be null when we reach this part 5843 if (f != null) { 5844 f.filter(s, this); 5845 } else { 5846 throw new IllegalStateException("You cannot call onTextChanged with a non " 5847 + "filterable adapter"); 5848 } 5849 } 5850 } 5851 } 5852 5853 /** 5854 * For our text watcher that is associated with the text filter. Does 5855 * nothing. 5856 */ 5857 @Override 5858 public void afterTextChanged(Editable s) { 5859 } 5860 5861 @Override 5862 public void onFilterComplete(int count) { 5863 if (mSelectedPosition < 0 && count > 0) { 5864 mResurrectToPosition = INVALID_POSITION; 5865 resurrectSelection(); 5866 } 5867 } 5868 5869 @Override 5870 protected ViewGroup.LayoutParams generateDefaultLayoutParams() { 5871 return new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 5872 ViewGroup.LayoutParams.WRAP_CONTENT, 0); 5873 } 5874 5875 @Override 5876 protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5877 return new LayoutParams(p); 5878 } 5879 5880 @Override 5881 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5882 return new AbsListView.LayoutParams(getContext(), attrs); 5883 } 5884 5885 @Override 5886 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 5887 return p instanceof AbsListView.LayoutParams; 5888 } 5889 5890 /** 5891 * Puts the list or grid into transcript mode. In this mode the list or grid will always scroll 5892 * to the bottom to show new items. 5893 * 5894 * @param mode the transcript mode to set 5895 * 5896 * @see #TRANSCRIPT_MODE_DISABLED 5897 * @see #TRANSCRIPT_MODE_NORMAL 5898 * @see #TRANSCRIPT_MODE_ALWAYS_SCROLL 5899 */ 5900 public void setTranscriptMode(int mode) { 5901 mTranscriptMode = mode; 5902 } 5903 5904 /** 5905 * Returns the current transcript mode. 5906 * 5907 * @return {@link #TRANSCRIPT_MODE_DISABLED}, {@link #TRANSCRIPT_MODE_NORMAL} or 5908 * {@link #TRANSCRIPT_MODE_ALWAYS_SCROLL} 5909 */ 5910 public int getTranscriptMode() { 5911 return mTranscriptMode; 5912 } 5913 5914 @Override 5915 public int getSolidColor() { 5916 return mCacheColorHint; 5917 } 5918 5919 /** 5920 * When set to a non-zero value, the cache color hint indicates that this list is always drawn 5921 * on top of a solid, single-color, opaque background. 5922 * 5923 * Zero means that what's behind this object is translucent (non solid) or is not made of a 5924 * single color. This hint will not affect any existing background drawable set on this view ( 5925 * typically set via {@link #setBackgroundDrawable(Drawable)}). 5926 * 5927 * @param color The background color 5928 */ 5929 public void setCacheColorHint(int color) { 5930 if (color != mCacheColorHint) { 5931 mCacheColorHint = color; 5932 int count = getChildCount(); 5933 for (int i = 0; i < count; i++) { 5934 getChildAt(i).setDrawingCacheBackgroundColor(color); 5935 } 5936 mRecycler.setCacheColorHint(color); 5937 } 5938 } 5939 5940 /** 5941 * When set to a non-zero value, the cache color hint indicates that this list is always drawn 5942 * on top of a solid, single-color, opaque background 5943 * 5944 * @return The cache color hint 5945 */ 5946 @ViewDebug.ExportedProperty(category = "drawing") 5947 public int getCacheColorHint() { 5948 return mCacheColorHint; 5949 } 5950 5951 /** 5952 * Move all views (excluding headers and footers) held by this AbsListView into the supplied 5953 * List. This includes views displayed on the screen as well as views stored in AbsListView's 5954 * internal view recycler. 5955 * 5956 * @param views A list into which to put the reclaimed views 5957 */ 5958 public void reclaimViews(List<View> views) { 5959 int childCount = getChildCount(); 5960 RecyclerListener listener = mRecycler.mRecyclerListener; 5961 5962 // Reclaim views on screen 5963 for (int i = 0; i < childCount; i++) { 5964 View child = getChildAt(i); 5965 AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams(); 5966 // Don't reclaim header or footer views, or views that should be ignored 5967 if (lp != null && mRecycler.shouldRecycleViewType(lp.viewType)) { 5968 views.add(child); 5969 child.setAccessibilityDelegate(null); 5970 if (listener != null) { 5971 // Pretend they went through the scrap heap 5972 listener.onMovedToScrapHeap(child); 5973 } 5974 } 5975 } 5976 mRecycler.reclaimScrapViews(views); 5977 removeAllViewsInLayout(); 5978 } 5979 5980 private void finishGlows() { 5981 if (mEdgeGlowTop != null) { 5982 mEdgeGlowTop.finish(); 5983 mEdgeGlowBottom.finish(); 5984 } 5985 } 5986 5987 /** 5988 * Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService 5989 * through the specified intent. 5990 * @param intent the intent used to identify the RemoteViewsService for the adapter to connect to. 5991 */ 5992 public void setRemoteViewsAdapter(Intent intent) { 5993 // Ensure that we don't already have a RemoteViewsAdapter that is bound to an existing 5994 // service handling the specified intent. 5995 if (mRemoteAdapter != null) { 5996 Intent.FilterComparison fcNew = new Intent.FilterComparison(intent); 5997 Intent.FilterComparison fcOld = new Intent.FilterComparison( 5998 mRemoteAdapter.getRemoteViewsServiceIntent()); 5999 if (fcNew.equals(fcOld)) { 6000 return; 6001 } 6002 } 6003 mDeferNotifyDataSetChanged = false; 6004 // Otherwise, create a new RemoteViewsAdapter for binding 6005 mRemoteAdapter = new RemoteViewsAdapter(getContext(), intent, this); 6006 if (mRemoteAdapter.isDataReady()) { 6007 setAdapter(mRemoteAdapter); 6008 } 6009 } 6010 6011 /** 6012 * Sets up the onClickHandler to be used by the RemoteViewsAdapter when inflating RemoteViews 6013 * 6014 * @param handler The OnClickHandler to use when inflating RemoteViews. 6015 * 6016 * @hide 6017 */ 6018 public void setRemoteViewsOnClickHandler(OnClickHandler handler) { 6019 // Ensure that we don't already have a RemoteViewsAdapter that is bound to an existing 6020 // service handling the specified intent. 6021 if (mRemoteAdapter != null) { 6022 mRemoteAdapter.setRemoteViewsOnClickHandler(handler); 6023 } 6024 } 6025 6026 /** 6027 * This defers a notifyDataSetChanged on the pending RemoteViewsAdapter if it has not 6028 * connected yet. 6029 */ 6030 @Override 6031 public void deferNotifyDataSetChanged() { 6032 mDeferNotifyDataSetChanged = true; 6033 } 6034 6035 /** 6036 * Called back when the adapter connects to the RemoteViewsService. 6037 */ 6038 @Override 6039 public boolean onRemoteAdapterConnected() { 6040 if (mRemoteAdapter != mAdapter) { 6041 setAdapter(mRemoteAdapter); 6042 if (mDeferNotifyDataSetChanged) { 6043 mRemoteAdapter.notifyDataSetChanged(); 6044 mDeferNotifyDataSetChanged = false; 6045 } 6046 return false; 6047 } else if (mRemoteAdapter != null) { 6048 mRemoteAdapter.superNotifyDataSetChanged(); 6049 return true; 6050 } 6051 return false; 6052 } 6053 6054 /** 6055 * Called back when the adapter disconnects from the RemoteViewsService. 6056 */ 6057 @Override 6058 public void onRemoteAdapterDisconnected() { 6059 // If the remote adapter disconnects, we keep it around 6060 // since the currently displayed items are still cached. 6061 // Further, we want the service to eventually reconnect 6062 // when necessary, as triggered by this view requesting 6063 // items from the Adapter. 6064 } 6065 6066 /** 6067 * Hints the RemoteViewsAdapter, if it exists, about which views are currently 6068 * being displayed by the AbsListView. 6069 */ 6070 void setVisibleRangeHint(int start, int end) { 6071 if (mRemoteAdapter != null) { 6072 mRemoteAdapter.setVisibleRangeHint(start, end); 6073 } 6074 } 6075 6076 /** 6077 * Sets the recycler listener to be notified whenever a View is set aside in 6078 * the recycler for later reuse. This listener can be used to free resources 6079 * associated to the View. 6080 * 6081 * @param listener The recycler listener to be notified of views set aside 6082 * in the recycler. 6083 * 6084 * @see android.widget.AbsListView.RecycleBin 6085 * @see android.widget.AbsListView.RecyclerListener 6086 */ 6087 public void setRecyclerListener(RecyclerListener listener) { 6088 mRecycler.mRecyclerListener = listener; 6089 } 6090 6091 class AdapterDataSetObserver extends AdapterView<ListAdapter>.AdapterDataSetObserver { 6092 @Override 6093 public void onChanged() { 6094 super.onChanged(); 6095 if (mFastScroll != null) { 6096 mFastScroll.onSectionsChanged(); 6097 } 6098 } 6099 6100 @Override 6101 public void onInvalidated() { 6102 super.onInvalidated(); 6103 if (mFastScroll != null) { 6104 mFastScroll.onSectionsChanged(); 6105 } 6106 } 6107 } 6108 6109 /** 6110 * A MultiChoiceModeListener receives events for {@link AbsListView#CHOICE_MODE_MULTIPLE_MODAL}. 6111 * It acts as the {@link ActionMode.Callback} for the selection mode and also receives 6112 * {@link #onItemCheckedStateChanged(ActionMode, int, long, boolean)} events when the user 6113 * selects and deselects list items. 6114 */ 6115 public interface MultiChoiceModeListener extends ActionMode.Callback { 6116 /** 6117 * Called when an item is checked or unchecked during selection mode. 6118 * 6119 * @param mode The {@link ActionMode} providing the selection mode 6120 * @param position Adapter position of the item that was checked or unchecked 6121 * @param id Adapter ID of the item that was checked or unchecked 6122 * @param checked <code>true</code> if the item is now checked, <code>false</code> 6123 * if the item is now unchecked. 6124 */ 6125 public void onItemCheckedStateChanged(ActionMode mode, 6126 int position, long id, boolean checked); 6127 } 6128 6129 class MultiChoiceModeWrapper implements MultiChoiceModeListener { 6130 private MultiChoiceModeListener mWrapped; 6131 6132 public void setWrapped(MultiChoiceModeListener wrapped) { 6133 mWrapped = wrapped; 6134 } 6135 6136 public boolean hasWrappedCallback() { 6137 return mWrapped != null; 6138 } 6139 6140 @Override 6141 public boolean onCreateActionMode(ActionMode mode, Menu menu) { 6142 if (mWrapped.onCreateActionMode(mode, menu)) { 6143 // Initialize checked graphic state? 6144 setLongClickable(false); 6145 return true; 6146 } 6147 return false; 6148 } 6149 6150 @Override 6151 public boolean onPrepareActionMode(ActionMode mode, Menu menu) { 6152 return mWrapped.onPrepareActionMode(mode, menu); 6153 } 6154 6155 @Override 6156 public boolean onActionItemClicked(ActionMode mode, MenuItem item) { 6157 return mWrapped.onActionItemClicked(mode, item); 6158 } 6159 6160 @Override 6161 public void onDestroyActionMode(ActionMode mode) { 6162 mWrapped.onDestroyActionMode(mode); 6163 mChoiceActionMode = null; 6164 6165 // Ending selection mode means deselecting everything. 6166 clearChoices(); 6167 6168 mDataChanged = true; 6169 rememberSyncState(); 6170 requestLayout(); 6171 6172 setLongClickable(true); 6173 } 6174 6175 @Override 6176 public void onItemCheckedStateChanged(ActionMode mode, 6177 int position, long id, boolean checked) { 6178 mWrapped.onItemCheckedStateChanged(mode, position, id, checked); 6179 6180 // If there are no items selected we no longer need the selection mode. 6181 if (getCheckedItemCount() == 0) { 6182 mode.finish(); 6183 } 6184 } 6185 } 6186 6187 /** 6188 * AbsListView extends LayoutParams to provide a place to hold the view type. 6189 */ 6190 public static class LayoutParams extends ViewGroup.LayoutParams { 6191 /** 6192 * View type for this view, as returned by 6193 * {@link android.widget.Adapter#getItemViewType(int) } 6194 */ 6195 @ViewDebug.ExportedProperty(category = "list", mapping = { 6196 @ViewDebug.IntToString(from = ITEM_VIEW_TYPE_IGNORE, to = "ITEM_VIEW_TYPE_IGNORE"), 6197 @ViewDebug.IntToString(from = ITEM_VIEW_TYPE_HEADER_OR_FOOTER, to = "ITEM_VIEW_TYPE_HEADER_OR_FOOTER") 6198 }) 6199 int viewType; 6200 6201 /** 6202 * When this boolean is set, the view has been added to the AbsListView 6203 * at least once. It is used to know whether headers/footers have already 6204 * been added to the list view and whether they should be treated as 6205 * recycled views or not. 6206 */ 6207 @ViewDebug.ExportedProperty(category = "list") 6208 boolean recycledHeaderFooter; 6209 6210 /** 6211 * When an AbsListView is measured with an AT_MOST measure spec, it needs 6212 * to obtain children views to measure itself. When doing so, the children 6213 * are not attached to the window, but put in the recycler which assumes 6214 * they've been attached before. Setting this flag will force the reused 6215 * view to be attached to the window rather than just attached to the 6216 * parent. 6217 */ 6218 @ViewDebug.ExportedProperty(category = "list") 6219 boolean forceAdd; 6220 6221 /** 6222 * The position the view was removed from when pulled out of the 6223 * scrap heap. 6224 * @hide 6225 */ 6226 int scrappedFromPosition; 6227 6228 /** 6229 * The ID the view represents 6230 */ 6231 long itemId = -1; 6232 6233 public LayoutParams(Context c, AttributeSet attrs) { 6234 super(c, attrs); 6235 } 6236 6237 public LayoutParams(int w, int h) { 6238 super(w, h); 6239 } 6240 6241 public LayoutParams(int w, int h, int viewType) { 6242 super(w, h); 6243 this.viewType = viewType; 6244 } 6245 6246 public LayoutParams(ViewGroup.LayoutParams source) { 6247 super(source); 6248 } 6249 } 6250 6251 /** 6252 * A RecyclerListener is used to receive a notification whenever a View is placed 6253 * inside the RecycleBin's scrap heap. This listener is used to free resources 6254 * associated to Views placed in the RecycleBin. 6255 * 6256 * @see android.widget.AbsListView.RecycleBin 6257 * @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener) 6258 */ 6259 public static interface RecyclerListener { 6260 /** 6261 * Indicates that the specified View was moved into the recycler's scrap heap. 6262 * The view is not displayed on screen any more and any expensive resource 6263 * associated with the view should be discarded. 6264 * 6265 * @param view 6266 */ 6267 void onMovedToScrapHeap(View view); 6268 } 6269 6270 /** 6271 * The RecycleBin facilitates reuse of views across layouts. The RecycleBin has two levels of 6272 * storage: ActiveViews and ScrapViews. ActiveViews are those views which were onscreen at the 6273 * start of a layout. By construction, they are displaying current information. At the end of 6274 * layout, all views in ActiveViews are demoted to ScrapViews. ScrapViews are old views that 6275 * could potentially be used by the adapter to avoid allocating views unnecessarily. 6276 * 6277 * @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener) 6278 * @see android.widget.AbsListView.RecyclerListener 6279 */ 6280 class RecycleBin { 6281 private RecyclerListener mRecyclerListener; 6282 6283 /** 6284 * The position of the first view stored in mActiveViews. 6285 */ 6286 private int mFirstActivePosition; 6287 6288 /** 6289 * Views that were on screen at the start of layout. This array is populated at the start of 6290 * layout, and at the end of layout all view in mActiveViews are moved to mScrapViews. 6291 * Views in mActiveViews represent a contiguous range of Views, with position of the first 6292 * view store in mFirstActivePosition. 6293 */ 6294 private View[] mActiveViews = new View[0]; 6295 6296 /** 6297 * Unsorted views that can be used by the adapter as a convert view. 6298 */ 6299 private ArrayList<View>[] mScrapViews; 6300 6301 private int mViewTypeCount; 6302 6303 private ArrayList<View> mCurrentScrap; 6304 6305 private ArrayList<View> mSkippedScrap; 6306 6307 private SparseArray<View> mTransientStateViews; 6308 private LongSparseArray<View> mTransientStateViewsById; 6309 6310 public void setViewTypeCount(int viewTypeCount) { 6311 if (viewTypeCount < 1) { 6312 throw new IllegalArgumentException("Can't have a viewTypeCount < 1"); 6313 } 6314 //noinspection unchecked 6315 ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount]; 6316 for (int i = 0; i < viewTypeCount; i++) { 6317 scrapViews[i] = new ArrayList<View>(); 6318 } 6319 mViewTypeCount = viewTypeCount; 6320 mCurrentScrap = scrapViews[0]; 6321 mScrapViews = scrapViews; 6322 } 6323 6324 public void markChildrenDirty() { 6325 if (mViewTypeCount == 1) { 6326 final ArrayList<View> scrap = mCurrentScrap; 6327 final int scrapCount = scrap.size(); 6328 for (int i = 0; i < scrapCount; i++) { 6329 scrap.get(i).forceLayout(); 6330 } 6331 } else { 6332 final int typeCount = mViewTypeCount; 6333 for (int i = 0; i < typeCount; i++) { 6334 final ArrayList<View> scrap = mScrapViews[i]; 6335 final int scrapCount = scrap.size(); 6336 for (int j = 0; j < scrapCount; j++) { 6337 scrap.get(j).forceLayout(); 6338 } 6339 } 6340 } 6341 if (mTransientStateViews != null) { 6342 final int count = mTransientStateViews.size(); 6343 for (int i = 0; i < count; i++) { 6344 mTransientStateViews.valueAt(i).forceLayout(); 6345 } 6346 } 6347 if (mTransientStateViewsById != null) { 6348 final int count = mTransientStateViewsById.size(); 6349 for (int i = 0; i < count; i++) { 6350 mTransientStateViewsById.valueAt(i).forceLayout(); 6351 } 6352 } 6353 } 6354 6355 public boolean shouldRecycleViewType(int viewType) { 6356 return viewType >= 0; 6357 } 6358 6359 /** 6360 * Clears the scrap heap. 6361 */ 6362 void clear() { 6363 if (mViewTypeCount == 1) { 6364 final ArrayList<View> scrap = mCurrentScrap; 6365 clearScrap(scrap); 6366 } else { 6367 final int typeCount = mViewTypeCount; 6368 for (int i = 0; i < typeCount; i++) { 6369 final ArrayList<View> scrap = mScrapViews[i]; 6370 clearScrap(scrap); 6371 } 6372 } 6373 6374 clearTransientStateViews(); 6375 } 6376 6377 /** 6378 * Fill ActiveViews with all of the children of the AbsListView. 6379 * 6380 * @param childCount The minimum number of views mActiveViews should hold 6381 * @param firstActivePosition The position of the first view that will be stored in 6382 * mActiveViews 6383 */ 6384 void fillActiveViews(int childCount, int firstActivePosition) { 6385 if (mActiveViews.length < childCount) { 6386 mActiveViews = new View[childCount]; 6387 } 6388 mFirstActivePosition = firstActivePosition; 6389 6390 //noinspection MismatchedReadAndWriteOfArray 6391 final View[] activeViews = mActiveViews; 6392 for (int i = 0; i < childCount; i++) { 6393 View child = getChildAt(i); 6394 AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams(); 6395 // Don't put header or footer views into the scrap heap 6396 if (lp != null && lp.viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { 6397 // Note: We do place AdapterView.ITEM_VIEW_TYPE_IGNORE in active views. 6398 // However, we will NOT place them into scrap views. 6399 activeViews[i] = child; 6400 } 6401 } 6402 } 6403 6404 /** 6405 * Get the view corresponding to the specified position. The view will be removed from 6406 * mActiveViews if it is found. 6407 * 6408 * @param position The position to look up in mActiveViews 6409 * @return The view if it is found, null otherwise 6410 */ 6411 View getActiveView(int position) { 6412 int index = position - mFirstActivePosition; 6413 final View[] activeViews = mActiveViews; 6414 if (index >=0 && index < activeViews.length) { 6415 final View match = activeViews[index]; 6416 activeViews[index] = null; 6417 return match; 6418 } 6419 return null; 6420 } 6421 6422 View getTransientStateView(int position) { 6423 if (mAdapter != null && mAdapterHasStableIds && mTransientStateViewsById != null) { 6424 long id = mAdapter.getItemId(position); 6425 View result = mTransientStateViewsById.get(id); 6426 mTransientStateViewsById.remove(id); 6427 return result; 6428 } 6429 if (mTransientStateViews != null) { 6430 final int index = mTransientStateViews.indexOfKey(position); 6431 if (index >= 0) { 6432 View result = mTransientStateViews.valueAt(index); 6433 mTransientStateViews.removeAt(index); 6434 return result; 6435 } 6436 } 6437 return null; 6438 } 6439 6440 /** 6441 * Dumps and fully detaches any currently saved views with transient 6442 * state. 6443 */ 6444 void clearTransientStateViews() { 6445 final SparseArray<View> viewsByPos = mTransientStateViews; 6446 if (viewsByPos != null) { 6447 final int N = viewsByPos.size(); 6448 for (int i = 0; i < N; i++) { 6449 removeDetachedView(viewsByPos.valueAt(i), false); 6450 } 6451 viewsByPos.clear(); 6452 } 6453 6454 final LongSparseArray<View> viewsById = mTransientStateViewsById; 6455 if (viewsById != null) { 6456 final int N = viewsById.size(); 6457 for (int i = 0; i < N; i++) { 6458 removeDetachedView(viewsById.valueAt(i), false); 6459 } 6460 viewsById.clear(); 6461 } 6462 } 6463 6464 /** 6465 * @return A view from the ScrapViews collection. These are unordered. 6466 */ 6467 View getScrapView(int position) { 6468 if (mViewTypeCount == 1) { 6469 return retrieveFromScrap(mCurrentScrap, position); 6470 } else { 6471 final int whichScrap = mAdapter.getItemViewType(position); 6472 if (whichScrap >= 0 && whichScrap < mScrapViews.length) { 6473 return retrieveFromScrap(mScrapViews[whichScrap], position); 6474 } 6475 } 6476 return null; 6477 } 6478 6479 /** 6480 * Puts a view into the list of scrap views. 6481 * <p> 6482 * If the list data hasn't changed or the adapter has stable IDs, views 6483 * with transient state will be preserved for later retrieval. 6484 * 6485 * @param scrap The view to add 6486 * @param position The view's position within its parent 6487 */ 6488 void addScrapView(View scrap, int position) { 6489 final AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams(); 6490 if (lp == null) { 6491 return; 6492 } 6493 6494 lp.scrappedFromPosition = position; 6495 6496 // Remove but don't scrap header or footer views, or views that 6497 // should otherwise not be recycled. 6498 final int viewType = lp.viewType; 6499 if (!shouldRecycleViewType(viewType)) { 6500 return; 6501 } 6502 6503 scrap.dispatchStartTemporaryDetach(); 6504 6505 // The the accessibility state of the view may change while temporary 6506 // detached and we do not allow detached views to fire accessibility 6507 // events. So we are announcing that the subtree changed giving a chance 6508 // to clients holding on to a view in this subtree to refresh it. 6509 notifyViewAccessibilityStateChangedIfNeeded( 6510 AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE); 6511 6512 // Don't scrap views that have transient state. 6513 final boolean scrapHasTransientState = scrap.hasTransientState(); 6514 if (scrapHasTransientState) { 6515 if (mAdapter != null && mAdapterHasStableIds) { 6516 // If the adapter has stable IDs, we can reuse the view for 6517 // the same data. 6518 if (mTransientStateViewsById == null) { 6519 mTransientStateViewsById = new LongSparseArray<View>(); 6520 } 6521 mTransientStateViewsById.put(lp.itemId, scrap); 6522 } else if (!mDataChanged) { 6523 // If the data hasn't changed, we can reuse the views at 6524 // their old positions. 6525 if (mTransientStateViews == null) { 6526 mTransientStateViews = new SparseArray<View>(); 6527 } 6528 mTransientStateViews.put(position, scrap); 6529 } else { 6530 // Otherwise, we'll have to remove the view and start over. 6531 if (mSkippedScrap == null) { 6532 mSkippedScrap = new ArrayList<View>(); 6533 } 6534 mSkippedScrap.add(scrap); 6535 } 6536 } else { 6537 if (mViewTypeCount == 1) { 6538 mCurrentScrap.add(scrap); 6539 } else { 6540 mScrapViews[viewType].add(scrap); 6541 } 6542 6543 if (mRecyclerListener != null) { 6544 mRecyclerListener.onMovedToScrapHeap(scrap); 6545 } 6546 } 6547 } 6548 6549 /** 6550 * Finish the removal of any views that skipped the scrap heap. 6551 */ 6552 void removeSkippedScrap() { 6553 if (mSkippedScrap == null) { 6554 return; 6555 } 6556 final int count = mSkippedScrap.size(); 6557 for (int i = 0; i < count; i++) { 6558 removeDetachedView(mSkippedScrap.get(i), false); 6559 } 6560 mSkippedScrap.clear(); 6561 } 6562 6563 /** 6564 * Move all views remaining in mActiveViews to mScrapViews. 6565 */ 6566 void scrapActiveViews() { 6567 final View[] activeViews = mActiveViews; 6568 final boolean hasListener = mRecyclerListener != null; 6569 final boolean multipleScraps = mViewTypeCount > 1; 6570 6571 ArrayList<View> scrapViews = mCurrentScrap; 6572 final int count = activeViews.length; 6573 for (int i = count - 1; i >= 0; i--) { 6574 final View victim = activeViews[i]; 6575 if (victim != null) { 6576 final AbsListView.LayoutParams lp 6577 = (AbsListView.LayoutParams) victim.getLayoutParams(); 6578 final int whichScrap = lp.viewType; 6579 6580 activeViews[i] = null; 6581 6582 if (victim.hasTransientState()) { 6583 // Store views with transient state for later use. 6584 victim.dispatchStartTemporaryDetach(); 6585 6586 if (mAdapter != null && mAdapterHasStableIds) { 6587 if (mTransientStateViewsById == null) { 6588 mTransientStateViewsById = new LongSparseArray<View>(); 6589 } 6590 long id = mAdapter.getItemId(mFirstActivePosition + i); 6591 mTransientStateViewsById.put(id, victim); 6592 } else if (!mDataChanged) { 6593 if (mTransientStateViews == null) { 6594 mTransientStateViews = new SparseArray<View>(); 6595 } 6596 mTransientStateViews.put(mFirstActivePosition + i, victim); 6597 } else if (whichScrap != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { 6598 // The data has changed, we can't keep this view. 6599 removeDetachedView(victim, false); 6600 } 6601 } else if (!shouldRecycleViewType(whichScrap)) { 6602 // Discard non-recyclable views except headers/footers. 6603 if (whichScrap != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { 6604 removeDetachedView(victim, false); 6605 } 6606 } else { 6607 // Store everything else on the appropriate scrap heap. 6608 if (multipleScraps) { 6609 scrapViews = mScrapViews[whichScrap]; 6610 } 6611 6612 victim.dispatchStartTemporaryDetach(); 6613 lp.scrappedFromPosition = mFirstActivePosition + i; 6614 scrapViews.add(victim); 6615 6616 if (hasListener) { 6617 mRecyclerListener.onMovedToScrapHeap(victim); 6618 } 6619 } 6620 } 6621 } 6622 6623 pruneScrapViews(); 6624 } 6625 6626 /** 6627 * Makes sure that the size of mScrapViews does not exceed the size of 6628 * mActiveViews, which can happen if an adapter does not recycle its 6629 * views. Removes cached transient state views that no longer have 6630 * transient state. 6631 */ 6632 private void pruneScrapViews() { 6633 final int maxViews = mActiveViews.length; 6634 final int viewTypeCount = mViewTypeCount; 6635 final ArrayList<View>[] scrapViews = mScrapViews; 6636 for (int i = 0; i < viewTypeCount; ++i) { 6637 final ArrayList<View> scrapPile = scrapViews[i]; 6638 int size = scrapPile.size(); 6639 final int extras = size - maxViews; 6640 size--; 6641 for (int j = 0; j < extras; j++) { 6642 removeDetachedView(scrapPile.remove(size--), false); 6643 } 6644 } 6645 6646 final SparseArray<View> transViewsByPos = mTransientStateViews; 6647 if (transViewsByPos != null) { 6648 for (int i = 0; i < transViewsByPos.size(); i++) { 6649 final View v = transViewsByPos.valueAt(i); 6650 if (!v.hasTransientState()) { 6651 removeDetachedView(v, false); 6652 transViewsByPos.removeAt(i); 6653 i--; 6654 } 6655 } 6656 } 6657 6658 final LongSparseArray<View> transViewsById = mTransientStateViewsById; 6659 if (transViewsById != null) { 6660 for (int i = 0; i < transViewsById.size(); i++) { 6661 final View v = transViewsById.valueAt(i); 6662 if (!v.hasTransientState()) { 6663 removeDetachedView(v, false); 6664 transViewsById.removeAt(i); 6665 i--; 6666 } 6667 } 6668 } 6669 } 6670 6671 /** 6672 * Puts all views in the scrap heap into the supplied list. 6673 */ 6674 void reclaimScrapViews(List<View> views) { 6675 if (mViewTypeCount == 1) { 6676 views.addAll(mCurrentScrap); 6677 } else { 6678 final int viewTypeCount = mViewTypeCount; 6679 final ArrayList<View>[] scrapViews = mScrapViews; 6680 for (int i = 0; i < viewTypeCount; ++i) { 6681 final ArrayList<View> scrapPile = scrapViews[i]; 6682 views.addAll(scrapPile); 6683 } 6684 } 6685 } 6686 6687 /** 6688 * Updates the cache color hint of all known views. 6689 * 6690 * @param color The new cache color hint. 6691 */ 6692 void setCacheColorHint(int color) { 6693 if (mViewTypeCount == 1) { 6694 final ArrayList<View> scrap = mCurrentScrap; 6695 final int scrapCount = scrap.size(); 6696 for (int i = 0; i < scrapCount; i++) { 6697 scrap.get(i).setDrawingCacheBackgroundColor(color); 6698 } 6699 } else { 6700 final int typeCount = mViewTypeCount; 6701 for (int i = 0; i < typeCount; i++) { 6702 final ArrayList<View> scrap = mScrapViews[i]; 6703 final int scrapCount = scrap.size(); 6704 for (int j = 0; j < scrapCount; j++) { 6705 scrap.get(j).setDrawingCacheBackgroundColor(color); 6706 } 6707 } 6708 } 6709 // Just in case this is called during a layout pass 6710 final View[] activeViews = mActiveViews; 6711 final int count = activeViews.length; 6712 for (int i = 0; i < count; ++i) { 6713 final View victim = activeViews[i]; 6714 if (victim != null) { 6715 victim.setDrawingCacheBackgroundColor(color); 6716 } 6717 } 6718 } 6719 6720 private View retrieveFromScrap(ArrayList<View> scrapViews, int position) { 6721 final int size = scrapViews.size(); 6722 if (size > 0) { 6723 // See if we still have a view for this position or ID. 6724 for (int i = 0; i < size; i++) { 6725 final View view = scrapViews.get(i); 6726 final AbsListView.LayoutParams params = 6727 (AbsListView.LayoutParams) view.getLayoutParams(); 6728 6729 if (mAdapterHasStableIds) { 6730 final long id = mAdapter.getItemId(position); 6731 if (id == params.itemId) { 6732 return scrapViews.remove(i); 6733 } 6734 } else if (params.scrappedFromPosition == position) { 6735 final View scrap = scrapViews.remove(i); 6736 clearAccessibilityFromScrap(scrap); 6737 return scrap; 6738 } 6739 } 6740 final View scrap = scrapViews.remove(size - 1); 6741 clearAccessibilityFromScrap(scrap); 6742 return scrap; 6743 } else { 6744 return null; 6745 } 6746 } 6747 6748 private void clearScrap(final ArrayList<View> scrap) { 6749 final int scrapCount = scrap.size(); 6750 for (int j = 0; j < scrapCount; j++) { 6751 removeDetachedView(scrap.remove(scrapCount - 1 - j), false); 6752 } 6753 } 6754 6755 private void clearAccessibilityFromScrap(View view) { 6756 if (view.isAccessibilityFocused()) { 6757 view.clearAccessibilityFocus(); 6758 } 6759 view.setAccessibilityDelegate(null); 6760 } 6761 6762 private void removeDetachedView(View child, boolean animate) { 6763 child.setAccessibilityDelegate(null); 6764 AbsListView.this.removeDetachedView(child, animate); 6765 } 6766 } 6767 6768 /** 6769 * Returns the height of the view for the specified position. 6770 * 6771 * @param position the item position 6772 * @return view height in pixels 6773 */ 6774 int getHeightForPosition(int position) { 6775 final int firstVisiblePosition = getFirstVisiblePosition(); 6776 final int childCount = getChildCount(); 6777 final int index = position - firstVisiblePosition; 6778 if (index >= 0 && index < childCount) { 6779 // Position is on-screen, use existing view. 6780 final View view = getChildAt(index); 6781 return view.getHeight(); 6782 } else { 6783 // Position is off-screen, obtain & recycle view. 6784 final View view = obtainView(position, mIsScrap); 6785 view.measure(mWidthMeasureSpec, MeasureSpec.UNSPECIFIED); 6786 final int height = view.getMeasuredHeight(); 6787 mRecycler.addScrapView(view, position); 6788 return height; 6789 } 6790 } 6791 6792 /** 6793 * Sets the selected item and positions the selection y pixels from the top edge 6794 * of the ListView. (If in touch mode, the item will not be selected but it will 6795 * still be positioned appropriately.) 6796 * 6797 * @param position Index (starting at 0) of the data item to be selected. 6798 * @param y The distance from the top edge of the ListView (plus padding) that the 6799 * item will be positioned. 6800 */ 6801 public void setSelectionFromTop(int position, int y) { 6802 if (mAdapter == null) { 6803 return; 6804 } 6805 6806 if (!isInTouchMode()) { 6807 position = lookForSelectablePosition(position, true); 6808 if (position >= 0) { 6809 setNextSelectedPositionInt(position); 6810 } 6811 } else { 6812 mResurrectToPosition = position; 6813 } 6814 6815 if (position >= 0) { 6816 mLayoutMode = LAYOUT_SPECIFIC; 6817 mSpecificTop = mListPadding.top + y; 6818 6819 if (mNeedSync) { 6820 mSyncPosition = position; 6821 mSyncRowId = mAdapter.getItemId(position); 6822 } 6823 6824 if (mPositionScroller != null) { 6825 mPositionScroller.stop(); 6826 } 6827 requestLayout(); 6828 } 6829 } 6830 6831 /** 6832 * Abstract positon scroller used to handle smooth scrolling. 6833 */ 6834 static abstract class AbsPositionScroller { 6835 public abstract void start(int position); 6836 public abstract void start(int position, int boundPosition); 6837 public abstract void startWithOffset(int position, int offset); 6838 public abstract void startWithOffset(int position, int offset, int duration); 6839 public abstract void stop(); 6840 } 6841 6842 /** 6843 * Default position scroller that simulates a fling. 6844 */ 6845 class PositionScroller extends AbsPositionScroller implements Runnable { 6846 private static final int SCROLL_DURATION = 200; 6847 6848 private static final int MOVE_DOWN_POS = 1; 6849 private static final int MOVE_UP_POS = 2; 6850 private static final int MOVE_DOWN_BOUND = 3; 6851 private static final int MOVE_UP_BOUND = 4; 6852 private static final int MOVE_OFFSET = 5; 6853 6854 private int mMode; 6855 private int mTargetPos; 6856 private int mBoundPos; 6857 private int mLastSeenPos; 6858 private int mScrollDuration; 6859 private final int mExtraScroll; 6860 6861 private int mOffsetFromTop; 6862 6863 PositionScroller() { 6864 mExtraScroll = ViewConfiguration.get(mContext).getScaledFadingEdgeLength(); 6865 } 6866 6867 @Override 6868 public void start(final int position) { 6869 stop(); 6870 6871 if (mDataChanged) { 6872 // Wait until we're back in a stable state to try this. 6873 mPositionScrollAfterLayout = new Runnable() { 6874 @Override public void run() { 6875 start(position); 6876 } 6877 }; 6878 return; 6879 } 6880 6881 final int childCount = getChildCount(); 6882 if (childCount == 0) { 6883 // Can't scroll without children. 6884 return; 6885 } 6886 6887 final int firstPos = mFirstPosition; 6888 final int lastPos = firstPos + childCount - 1; 6889 6890 int viewTravelCount; 6891 int clampedPosition = Math.max(0, Math.min(getCount() - 1, position)); 6892 if (clampedPosition < firstPos) { 6893 viewTravelCount = firstPos - clampedPosition + 1; 6894 mMode = MOVE_UP_POS; 6895 } else if (clampedPosition > lastPos) { 6896 viewTravelCount = clampedPosition - lastPos + 1; 6897 mMode = MOVE_DOWN_POS; 6898 } else { 6899 scrollToVisible(clampedPosition, INVALID_POSITION, SCROLL_DURATION); 6900 return; 6901 } 6902 6903 if (viewTravelCount > 0) { 6904 mScrollDuration = SCROLL_DURATION / viewTravelCount; 6905 } else { 6906 mScrollDuration = SCROLL_DURATION; 6907 } 6908 mTargetPos = clampedPosition; 6909 mBoundPos = INVALID_POSITION; 6910 mLastSeenPos = INVALID_POSITION; 6911 6912 postOnAnimation(this); 6913 } 6914 6915 @Override 6916 public void start(final int position, final int boundPosition) { 6917 stop(); 6918 6919 if (boundPosition == INVALID_POSITION) { 6920 start(position); 6921 return; 6922 } 6923 6924 if (mDataChanged) { 6925 // Wait until we're back in a stable state to try this. 6926 mPositionScrollAfterLayout = new Runnable() { 6927 @Override public void run() { 6928 start(position, boundPosition); 6929 } 6930 }; 6931 return; 6932 } 6933 6934 final int childCount = getChildCount(); 6935 if (childCount == 0) { 6936 // Can't scroll without children. 6937 return; 6938 } 6939 6940 final int firstPos = mFirstPosition; 6941 final int lastPos = firstPos + childCount - 1; 6942 6943 int viewTravelCount; 6944 int clampedPosition = Math.max(0, Math.min(getCount() - 1, position)); 6945 if (clampedPosition < firstPos) { 6946 final int boundPosFromLast = lastPos - boundPosition; 6947 if (boundPosFromLast < 1) { 6948 // Moving would shift our bound position off the screen. Abort. 6949 return; 6950 } 6951 6952 final int posTravel = firstPos - clampedPosition + 1; 6953 final int boundTravel = boundPosFromLast - 1; 6954 if (boundTravel < posTravel) { 6955 viewTravelCount = boundTravel; 6956 mMode = MOVE_UP_BOUND; 6957 } else { 6958 viewTravelCount = posTravel; 6959 mMode = MOVE_UP_POS; 6960 } 6961 } else if (clampedPosition > lastPos) { 6962 final int boundPosFromFirst = boundPosition - firstPos; 6963 if (boundPosFromFirst < 1) { 6964 // Moving would shift our bound position off the screen. Abort. 6965 return; 6966 } 6967 6968 final int posTravel = clampedPosition - lastPos + 1; 6969 final int boundTravel = boundPosFromFirst - 1; 6970 if (boundTravel < posTravel) { 6971 viewTravelCount = boundTravel; 6972 mMode = MOVE_DOWN_BOUND; 6973 } else { 6974 viewTravelCount = posTravel; 6975 mMode = MOVE_DOWN_POS; 6976 } 6977 } else { 6978 scrollToVisible(clampedPosition, boundPosition, SCROLL_DURATION); 6979 return; 6980 } 6981 6982 if (viewTravelCount > 0) { 6983 mScrollDuration = SCROLL_DURATION / viewTravelCount; 6984 } else { 6985 mScrollDuration = SCROLL_DURATION; 6986 } 6987 mTargetPos = clampedPosition; 6988 mBoundPos = boundPosition; 6989 mLastSeenPos = INVALID_POSITION; 6990 6991 postOnAnimation(this); 6992 } 6993 6994 @Override 6995 public void startWithOffset(int position, int offset) { 6996 startWithOffset(position, offset, SCROLL_DURATION); 6997 } 6998 6999 @Override 7000 public void startWithOffset(final int position, int offset, final int duration) { 7001 stop(); 7002 7003 if (mDataChanged) { 7004 // Wait until we're back in a stable state to try this. 7005 final int postOffset = offset; 7006 mPositionScrollAfterLayout = new Runnable() { 7007 @Override public void run() { 7008 startWithOffset(position, postOffset, duration); 7009 } 7010 }; 7011 return; 7012 } 7013 7014 final int childCount = getChildCount(); 7015 if (childCount == 0) { 7016 // Can't scroll without children. 7017 return; 7018 } 7019 7020 offset += getPaddingTop(); 7021 7022 mTargetPos = Math.max(0, Math.min(getCount() - 1, position)); 7023 mOffsetFromTop = offset; 7024 mBoundPos = INVALID_POSITION; 7025 mLastSeenPos = INVALID_POSITION; 7026 mMode = MOVE_OFFSET; 7027 7028 final int firstPos = mFirstPosition; 7029 final int lastPos = firstPos + childCount - 1; 7030 7031 int viewTravelCount; 7032 if (mTargetPos < firstPos) { 7033 viewTravelCount = firstPos - mTargetPos; 7034 } else if (mTargetPos > lastPos) { 7035 viewTravelCount = mTargetPos - lastPos; 7036 } else { 7037 // On-screen, just scroll. 7038 final int targetTop = getChildAt(mTargetPos - firstPos).getTop(); 7039 smoothScrollBy(targetTop - offset, duration, true); 7040 return; 7041 } 7042 7043 // Estimate how many screens we should travel 7044 final float screenTravelCount = (float) viewTravelCount / childCount; 7045 mScrollDuration = screenTravelCount < 1 ? 7046 duration : (int) (duration / screenTravelCount); 7047 mLastSeenPos = INVALID_POSITION; 7048 7049 postOnAnimation(this); 7050 } 7051 7052 /** 7053 * Scroll such that targetPos is in the visible padded region without scrolling 7054 * boundPos out of view. Assumes targetPos is onscreen. 7055 */ 7056 private void scrollToVisible(int targetPos, int boundPos, int duration) { 7057 final int firstPos = mFirstPosition; 7058 final int childCount = getChildCount(); 7059 final int lastPos = firstPos + childCount - 1; 7060 final int paddedTop = mListPadding.top; 7061 final int paddedBottom = getHeight() - mListPadding.bottom; 7062 7063 if (targetPos < firstPos || targetPos > lastPos) { 7064 Log.w(TAG, "scrollToVisible called with targetPos " + targetPos + 7065 " not visible [" + firstPos + ", " + lastPos + "]"); 7066 } 7067 if (boundPos < firstPos || boundPos > lastPos) { 7068 // boundPos doesn't matter, it's already offscreen. 7069 boundPos = INVALID_POSITION; 7070 } 7071 7072 final View targetChild = getChildAt(targetPos - firstPos); 7073 final int targetTop = targetChild.getTop(); 7074 final int targetBottom = targetChild.getBottom(); 7075 int scrollBy = 0; 7076 7077 if (targetBottom > paddedBottom) { 7078 scrollBy = targetBottom - paddedBottom; 7079 } 7080 if (targetTop < paddedTop) { 7081 scrollBy = targetTop - paddedTop; 7082 } 7083 7084 if (scrollBy == 0) { 7085 return; 7086 } 7087 7088 if (boundPos >= 0) { 7089 final View boundChild = getChildAt(boundPos - firstPos); 7090 final int boundTop = boundChild.getTop(); 7091 final int boundBottom = boundChild.getBottom(); 7092 final int absScroll = Math.abs(scrollBy); 7093 7094 if (scrollBy < 0 && boundBottom + absScroll > paddedBottom) { 7095 // Don't scroll the bound view off the bottom of the screen. 7096 scrollBy = Math.max(0, boundBottom - paddedBottom); 7097 } else if (scrollBy > 0 && boundTop - absScroll < paddedTop) { 7098 // Don't scroll the bound view off the top of the screen. 7099 scrollBy = Math.min(0, boundTop - paddedTop); 7100 } 7101 } 7102 7103 smoothScrollBy(scrollBy, duration); 7104 } 7105 7106 @Override 7107 public void stop() { 7108 removeCallbacks(this); 7109 } 7110 7111 @Override 7112 public void run() { 7113 final int listHeight = getHeight(); 7114 final int firstPos = mFirstPosition; 7115 7116 switch (mMode) { 7117 case MOVE_DOWN_POS: { 7118 final int lastViewIndex = getChildCount() - 1; 7119 final int lastPos = firstPos + lastViewIndex; 7120 7121 if (lastViewIndex < 0) { 7122 return; 7123 } 7124 7125 if (lastPos == mLastSeenPos) { 7126 // No new views, let things keep going. 7127 postOnAnimation(this); 7128 return; 7129 } 7130 7131 final View lastView = getChildAt(lastViewIndex); 7132 final int lastViewHeight = lastView.getHeight(); 7133 final int lastViewTop = lastView.getTop(); 7134 final int lastViewPixelsShowing = listHeight - lastViewTop; 7135 final int extraScroll = lastPos < mItemCount - 1 ? 7136 Math.max(mListPadding.bottom, mExtraScroll) : mListPadding.bottom; 7137 7138 final int scrollBy = lastViewHeight - lastViewPixelsShowing + extraScroll; 7139 smoothScrollBy(scrollBy, mScrollDuration, true); 7140 7141 mLastSeenPos = lastPos; 7142 if (lastPos < mTargetPos) { 7143 postOnAnimation(this); 7144 } 7145 break; 7146 } 7147 7148 case MOVE_DOWN_BOUND: { 7149 final int nextViewIndex = 1; 7150 final int childCount = getChildCount(); 7151 7152 if (firstPos == mBoundPos || childCount <= nextViewIndex 7153 || firstPos + childCount >= mItemCount) { 7154 return; 7155 } 7156 final int nextPos = firstPos + nextViewIndex; 7157 7158 if (nextPos == mLastSeenPos) { 7159 // No new views, let things keep going. 7160 postOnAnimation(this); 7161 return; 7162 } 7163 7164 final View nextView = getChildAt(nextViewIndex); 7165 final int nextViewHeight = nextView.getHeight(); 7166 final int nextViewTop = nextView.getTop(); 7167 final int extraScroll = Math.max(mListPadding.bottom, mExtraScroll); 7168 if (nextPos < mBoundPos) { 7169 smoothScrollBy(Math.max(0, nextViewHeight + nextViewTop - extraScroll), 7170 mScrollDuration, true); 7171 7172 mLastSeenPos = nextPos; 7173 7174 postOnAnimation(this); 7175 } else { 7176 if (nextViewTop > extraScroll) { 7177 smoothScrollBy(nextViewTop - extraScroll, mScrollDuration, true); 7178 } 7179 } 7180 break; 7181 } 7182 7183 case MOVE_UP_POS: { 7184 if (firstPos == mLastSeenPos) { 7185 // No new views, let things keep going. 7186 postOnAnimation(this); 7187 return; 7188 } 7189 7190 final View firstView = getChildAt(0); 7191 if (firstView == null) { 7192 return; 7193 } 7194 final int firstViewTop = firstView.getTop(); 7195 final int extraScroll = firstPos > 0 ? 7196 Math.max(mExtraScroll, mListPadding.top) : mListPadding.top; 7197 7198 smoothScrollBy(firstViewTop - extraScroll, mScrollDuration, true); 7199 7200 mLastSeenPos = firstPos; 7201 7202 if (firstPos > mTargetPos) { 7203 postOnAnimation(this); 7204 } 7205 break; 7206 } 7207 7208 case MOVE_UP_BOUND: { 7209 final int lastViewIndex = getChildCount() - 2; 7210 if (lastViewIndex < 0) { 7211 return; 7212 } 7213 final int lastPos = firstPos + lastViewIndex; 7214 7215 if (lastPos == mLastSeenPos) { 7216 // No new views, let things keep going. 7217 postOnAnimation(this); 7218 return; 7219 } 7220 7221 final View lastView = getChildAt(lastViewIndex); 7222 final int lastViewHeight = lastView.getHeight(); 7223 final int lastViewTop = lastView.getTop(); 7224 final int lastViewPixelsShowing = listHeight - lastViewTop; 7225 final int extraScroll = Math.max(mListPadding.top, mExtraScroll); 7226 mLastSeenPos = lastPos; 7227 if (lastPos > mBoundPos) { 7228 smoothScrollBy(-(lastViewPixelsShowing - extraScroll), mScrollDuration, true); 7229 postOnAnimation(this); 7230 } else { 7231 final int bottom = listHeight - extraScroll; 7232 final int lastViewBottom = lastViewTop + lastViewHeight; 7233 if (bottom > lastViewBottom) { 7234 smoothScrollBy(-(bottom - lastViewBottom), mScrollDuration, true); 7235 } 7236 } 7237 break; 7238 } 7239 7240 case MOVE_OFFSET: { 7241 if (mLastSeenPos == firstPos) { 7242 // No new views, let things keep going. 7243 postOnAnimation(this); 7244 return; 7245 } 7246 7247 mLastSeenPos = firstPos; 7248 7249 final int childCount = getChildCount(); 7250 final int position = mTargetPos; 7251 final int lastPos = firstPos + childCount - 1; 7252 7253 int viewTravelCount = 0; 7254 if (position < firstPos) { 7255 viewTravelCount = firstPos - position + 1; 7256 } else if (position > lastPos) { 7257 viewTravelCount = position - lastPos; 7258 } 7259 7260 // Estimate how many screens we should travel 7261 final float screenTravelCount = (float) viewTravelCount / childCount; 7262 7263 final float modifier = Math.min(Math.abs(screenTravelCount), 1.f); 7264 if (position < firstPos) { 7265 final int distance = (int) (-getHeight() * modifier); 7266 final int duration = (int) (mScrollDuration * modifier); 7267 smoothScrollBy(distance, duration, true); 7268 postOnAnimation(this); 7269 } else if (position > lastPos) { 7270 final int distance = (int) (getHeight() * modifier); 7271 final int duration = (int) (mScrollDuration * modifier); 7272 smoothScrollBy(distance, duration, true); 7273 postOnAnimation(this); 7274 } else { 7275 // On-screen, just scroll. 7276 final int targetTop = getChildAt(position - firstPos).getTop(); 7277 final int distance = targetTop - mOffsetFromTop; 7278 final int duration = (int) (mScrollDuration * 7279 ((float) Math.abs(distance) / getHeight())); 7280 smoothScrollBy(distance, duration, true); 7281 } 7282 break; 7283 } 7284 7285 default: 7286 break; 7287 } 7288 } 7289 } 7290} 7291