Java tutorial
/* * Copyright (C) 2006 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.appunite.list; import android.annotation.TargetApi; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.graphics.drawable.TransitionDrawable; import android.os.*; import android.support.v4.view.AccessibilityDelegateCompat; import android.support.v4.view.MotionEventCompat; import android.support.v4.view.ViewCompat; import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; import android.support.v4.widget.EdgeEffectCompat; import android.support.v7.view.ActionMode; import android.text.Editable; import android.text.TextUtils; import android.text.TextWatcher; import android.util.AttributeSet; import android.util.Log; import android.util.SparseArray; import android.util.SparseBooleanArray; import android.view.ContextMenu.ContextMenuInfo; import android.view.*; import android.view.accessibility.AccessibilityEvent; import android.view.accessibility.AccessibilityNodeInfo; import android.view.animation.Interpolator; import android.view.animation.LinearInterpolator; import android.view.inputmethod.*; import android.widget.*; import java.util.ArrayList; import java.util.List; /** * Base class that can be used to implement virtualized lists of items. A list does * not have a spatial definition here. For instance, subclases of this class can * display the content of the list in a grid, in a carousel, as stack, etc. * * @attr ref android.R.styleable#AbsListView_listSelector * @attr ref android.R.styleable#AbsListView_drawSelectorOnTop * @attr ref android.R.styleable#AbsListView_stackFromBottom * @attr ref android.R.styleable#AbsListView_scrollingCache * @attr ref android.R.styleable#AbsListView_textFilterEnabled * @attr ref android.R.styleable#AbsListView_transcriptMode * @attr ref android.R.styleable#AbsListView_cacheColorHint * @attr ref android.R.styleable#AbsListView_fastScrollEnabled * @attr ref android.R.styleable#AbsListView_smoothScrollbar * @attr ref android.R.styleable#AbsListView_choiceMode */ public abstract class AbsListView extends AdapterView<ListAdapter> implements TextWatcher, ViewTreeObserver.OnGlobalLayoutListener, Filter.FilterListener, ViewTreeObserver.OnTouchModeChangeListener { @SuppressWarnings("UnusedDeclaration") private static final String TAG = "AbsListView"; /** * Disables the transcript mode. * * @see #setTranscriptMode(int) */ public static final int TRANSCRIPT_MODE_DISABLED = 0; /** * The list will automatically scroll to the bottom when a data set change * notification is received and only if the last item is already visible * on screen. * * @see #setTranscriptMode(int) */ public static final int TRANSCRIPT_MODE_NORMAL = 1; /** * The list will automatically scroll to the bottom, no matter what items * are currently visible. * * @see #setTranscriptMode(int) */ public static final int TRANSCRIPT_MODE_ALWAYS_SCROLL = 2; /** * Indicates that we are not in the middle of a touch gesture */ static final int TOUCH_MODE_REST = -1; /** * Indicates we just received the touch event and we are waiting to see if the it is a tap or a * scroll gesture. */ static final int TOUCH_MODE_DOWN = 0; /** * Indicates the touch has been recognized as a tap and we are now waiting to see if the touch * is a longpress */ static final int TOUCH_MODE_TAP = 1; /** * Indicates we have waited for everything we can wait for, but the user's finger is still down */ static final int TOUCH_MODE_DONE_WAITING = 2; /** * Indicates the touch gesture is a scroll */ static final int TOUCH_MODE_SCROLL = 3; /** * Indicates the view is in the process of being flung */ static final int TOUCH_MODE_FLING = 4; /** * Indicates the touch gesture is an overscroll - a scroll beyond the beginning or end. */ static final int TOUCH_MODE_OVERSCROLL = 5; /** * Indicates the view is being flung outside of normal content bounds * and will spring back. */ static final int TOUCH_MODE_OVERFLING = 6; /** * Regular layout - usually an unsolicited layout from the view system */ static final int LAYOUT_NORMAL = 0; /** * Show the first item */ static final int LAYOUT_FORCE_TOP = 1; /** * Force the selected item to be on somewhere on the screen */ static final int LAYOUT_SET_SELECTION = 2; /** * Show the last item */ static final int LAYOUT_FORCE_BOTTOM = 3; /** * Make a mSelectedItem appear in a specific location and build the rest of * the views from there. The top is specified by mSpecificTop. */ static final int LAYOUT_SPECIFIC = 4; /** * Layout to sync as a result of a data change. Restore mSyncPosition to have its top * at mSpecificTop */ static final int LAYOUT_SYNC = 5; /** * Layout as a result of using the navigation keys */ static final int LAYOUT_MOVE_SELECTION = 6; /** * Normal list that does not indicate choices */ public static final int CHOICE_MODE_NONE = 0; /** * The list allows up to one choice */ public static final int CHOICE_MODE_SINGLE = 1; /** * The list allows multiple choices */ public static final int CHOICE_MODE_MULTIPLE = 2; /** * The list allows multiple choices in a modal selection mode */ public static final int CHOICE_MODE_MULTIPLE_MODAL = 3; /** * Controls if/how the user may choose/check items in the list */ int mChoiceMode = CHOICE_MODE_NONE; /** * Controls CHOICE_MODE_MULTIPLE_MODAL. null when inactive. */ ActionMode mChoiceActionMode; /** * Wrapper for the multiple choice mode callback; AbsListView needs to perform * a few extra actions around what application code does. */ MultiChoiceModeWrapper mMultiChoiceModeCallback; /** * Running count of how many items are currently checked */ int mCheckedItemCount; /** * Running state of which positions are currently checked */ SparseBooleanArray mCheckStates; /** * Running state of which IDs are currently checked. * If there is a value for a given key, the checked state for that ID is true * and the value holds the last known position in the adapter for that id. */ LongSparseArray<Integer> mCheckedIdStates; /** * Controls how the next layout will happen */ int mLayoutMode = LAYOUT_NORMAL; /** * Should be used by subclasses to listen to changes in the dataset */ AdapterDataSetObserver mDataSetObserver; /** * The adapter containing the data to be displayed by this view */ ListAdapter mAdapter; /** * If mAdapter != null, whenever this is true the adapter has stable IDs. */ boolean mAdapterHasStableIds; /** * This flag indicates the a full notify is required when the RemoteViewsAdapter connects */ private boolean mDeferNotifyDataSetChanged = false; /** * Indicates whether the list selector should be drawn on top of the children or behind */ boolean mDrawSelectorOnTop = false; /** * The drawable used to draw the selector */ Drawable mSelector; /** * The current position of the selector in the list. */ int mSelectorPosition = INVALID_POSITION; /** * Defines the selector's location and dimension at drawing time */ Rect mSelectorRect = new Rect(); /** * The data set used to store unused views that should be reused during the next layout * to avoid creating new ones */ final RecycleBin mRecycler = new RecycleBin(); /** * The selection's left padding */ int mSelectionLeftPadding = 0; /** * The selection's top padding */ int mSelectionTopPadding = 0; /** * The selection's right padding */ int mSelectionRightPadding = 0; /** * The selection's bottom padding */ int mSelectionBottomPadding = 0; /** * This view's padding */ Rect mListPadding = new Rect(); /** * Subclasses must retain their measure spec from onMeasure() into this member */ int mWidthMeasureSpec = 0; /** * The top scroll indicator */ View mScrollUp; /** * The down scroll indicator */ View mScrollDown; /** * When the view is scrolling, this flag is set to true to indicate subclasses that * the drawing cache was enabled on the children */ boolean mCachingStarted; boolean mCachingActive; /** * The position of the view that received the down motion event */ int mMotionPosition; /** * The offset to the top of the mMotionPosition view when the down motion event was received */ int mMotionViewOriginalTop; /** * The desired offset to the top of the mMotionPosition view after a scroll */ int mMotionViewNewTop; /** * The X value associated with the the down motion event */ int mMotionX; /** * The Y value associated with the the down motion event */ int mMotionY; /** * One of TOUCH_MODE_REST, TOUCH_MODE_DOWN, TOUCH_MODE_TAP, TOUCH_MODE_SCROLL, or * TOUCH_MODE_DONE_WAITING */ int mTouchMode = TOUCH_MODE_REST; /** * Y value from on the previous motion event (if any) */ int mLastY; /** * How far the finger moved before we started scrolling */ int mMotionCorrection; /** * Determines speed during touch scrolling */ private VelocityTracker mVelocityTracker; /** * Handles one frame of a fling */ private FlingRunnable mFlingRunnable; /** * Handles scrolling between positions within the list. */ PositionScroller mPositionScroller; /** * The offset in pixels form the top of the AdapterView to the top * of the currently selected view. Used to save and restore state. */ int mSelectedTop = 0; /** * Indicates whether the list is stacked from the bottom edge or * the top edge. */ boolean mStackFromBottom; /** * When set to true, the list automatically discards the children's * bitmap cache after scrolling. */ boolean mScrollingCacheEnabled; /** * Whether or not to enable the fast scroll feature on this list */ boolean mFastScrollEnabled; /** * Optional callback to notify client when scroll position has changed */ private OnScrollListener mOnScrollListener; /** * Keeps track of our accessory window */ PopupWindow mPopup; /** * Used with type filter window */ EditText mTextFilter; /** * Indicates whether to use pixels-based or position-based scrollbar * properties. */ private boolean mSmoothScrollbarEnabled = true; /** * Indicates that this view supports filtering */ private boolean mTextFilterEnabled; /** * Indicates that this view is currently displaying a filtered view of the data */ private boolean mFiltered; /** * Rectangle used for hit testing children */ private Rect mTouchFrame; /** * The position to resurrect the selected position to. */ int mResurrectToPosition = INVALID_POSITION; private ContextMenuInfo mContextMenuInfo = null; /** * Maximum distance to record overscroll */ int mOverscrollMax; /** * Content width divided by this is the overscroll limit. */ static final int OVERSCROLL_LIMIT_DIVISOR = 3; /** * How many positions in either direction we will search to try to * find a checked item with a stable ID that moved position across * a data set change. If the item isn't found it will be unselected. */ private static final int CHECK_POSITION_SEARCH_DISTANCE = 20; /** * Used to request a layout when we changed touch mode */ private static final int TOUCH_MODE_UNKNOWN = -1; private static final int TOUCH_MODE_ON = 0; private static final int TOUCH_MODE_OFF = 1; private int mLastTouchMode = TOUCH_MODE_UNKNOWN; private static final boolean PROFILE_SCROLLING = false; private boolean mScrollProfilingStarted = false; private static final boolean PROFILE_FLINGING = false; private boolean mFlingProfilingStarted = false; /** * The StrictMode "critical time span" objects to catch animation * stutters. Non-null when a time-sensitive animation is * in-flight. Must call finish() on them when done animating. * These are no-ops on user builds. */ // TODO this will be probably hard to implement while backporting (j.m.) // private StrictMode.Span mScrollStrictSpan = null; // private StrictMode.Span mFlingStrictSpan = null; /** * The last CheckForLongPress runnable we posted, if any */ private CheckForLongPress mPendingCheckForLongPress; /** * The last CheckForTap runnable we posted, if any */ private Runnable mPendingCheckForTap; /** * The last CheckForKeyLongPress runnable we posted, if any */ private CheckForKeyLongPress mPendingCheckForKeyLongPress; /** * Acts upon click */ private AbsListView.PerformClick mPerformClick; /** * Delayed action for touch mode. */ private Runnable mTouchModeReset; /** * This view is in transcript mode -- it shows the bottom of the list when the data * changes */ private int mTranscriptMode; /** * Indicates that this list is always drawn on top of a solid, single-color, opaque * background */ private int mCacheColorHint; /** * The select child's view (from the adapter's getView) is enabled. */ private boolean mIsChildViewEnabled; /** * The last scroll state reported to clients through {@link OnScrollListener}. */ private int mLastScrollState = OnScrollListener.SCROLL_STATE_IDLE; /** * Helper object that renders and controls the fast scroll thumb. */ private FastScroller mFastScroller; private boolean mGlobalLayoutListenerAddedFilter; private int mTouchSlop; private float mDensityScale; private InputConnection mDefInputConnection; private InputConnectionWrapper mPublicInputConnection; private Runnable mClearScrollingCache; Runnable mPositionScrollAfterLayout; private int mMinimumVelocity; private int mMaximumVelocity; private float mVelocityScale = 1.0f; final boolean[] mIsScrap = new boolean[1]; // True when the popup should be hidden because of a call to // dispatchDisplayHint() private boolean mPopupHidden; /** * ID of the active pointer. This is used to retain consistency during * drags/flings if multiple pointers are used. */ private int mActivePointerId = INVALID_POINTER; /** * Sentinel value for no current active pointer. * Used by {@link #mActivePointerId}. */ private static final int INVALID_POINTER = -1; /** * Maximum distance to overscroll by during edge effects */ int mOverscrollDistance; /** * Maximum distance to overfling during edge effects */ int mOverflingDistance; // These two EdgeGlows are always set and used together. // Checking one for null is as good as checking both. /** * Tracks the state of the top edge glow. */ private EdgeEffectCompat mEdgeGlowTop; /** * Tracks the state of the bottom edge glow. */ private EdgeEffectCompat mEdgeGlowBottom; /** * An estimate of how many pixels are between the top of the list and * the top of the first position in the adapter, based on the last time * we saw it. Used to hint where to draw edge glows. */ private int mFirstPositionDistanceGuess; /** * An estimate of how many pixels are between the bottom of the list and * the bottom of the last position in the adapter, based on the last time * we saw it. Used to hint where to draw edge glows. */ private int mLastPositionDistanceGuess; /** * Used for determining when to cancel out of overscroll. */ private int mDirection = 0; /** * Tracked on measurement in transcript mode. Makes sure that we can still pin to * the bottom correctly on resizes. */ private boolean mForceTranscriptScroll; private int mGlowPaddingLeft; private int mGlowPaddingRight; /** * Used for interacting with list items from an accessibility service. */ private ListItemAccessibilityDelegate mAccessibilityDelegate; private int mLastAccessibilityScrollEventFromIndex; private int mLastAccessibilityScrollEventToIndex; /** * Track the item count from the last time we handled a data change. */ private int mLastHandledItemCount; /** * Used for smooth scrolling at a consistent rate */ static final Interpolator sLinearInterpolator = new LinearInterpolator(); /** * The saved state that we will be restoring from when we next sync. * Kept here so that if we happen to be asked to save our state before * the sync happens, we can return this existing data rather than losing * it. */ private SavedState mPendingSync; /** * Interface definition for a callback to be invoked when the list or grid * has been scrolled. */ public interface OnScrollListener { /** * The view is not scrolling. Note navigating the list using the trackball counts as * being in the idle state since these transitions are not animated. */ public static int SCROLL_STATE_IDLE = 0; /** * The user is scrolling using touch, and their finger is still on the screen */ public static int SCROLL_STATE_TOUCH_SCROLL = 1; /** * The user had previously been scrolling using touch and had performed a fling. The * animation is now coasting to a stop */ public static int SCROLL_STATE_FLING = 2; /** * Callback method to be invoked while the list view or grid view is being scrolled. If the * view is being scrolled, this method will be called before the next frame of the scroll is * rendered. In particular, it will be called before any calls to * {@link android.widget.Adapter#getView(int, View, ViewGroup)}. * * @param view The view whose scroll state is being reported * * @param scrollState The current scroll state. One of {@link #SCROLL_STATE_IDLE}, * {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}. */ public void onScrollStateChanged(AbsListView view, int scrollState); /** * Callback method to be invoked when the list or grid has been scrolled. This will be * called after the scroll has completed * @param view The view whose scroll state is being reported * @param firstVisibleItem the index of the first visible cell (ignore if * visibleItemCount == 0) * @param visibleItemCount the number of visible cells * @param totalItemCount the number of items in the list adaptor */ public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount); } /** * The top-level view of a list item can implement this interface to allow * itself to modify the bounds of the selection shown for that item. */ public interface SelectionBoundsAdjuster { /** * Called to allow the list item to adjust the bounds shown for * its selection. * * @param bounds On call, this contains the bounds the list has * selected for the item (that is the bounds of the entire view). The * values can be modified as desired. */ public void adjustListItemSelectionBounds(Rect bounds); } public AbsListView(Context context) { super(context); initAbsListView(); setVerticalScrollBarEnabled(true); TypedArray a = context.obtainStyledAttributes(R.styleable.View); initializeScrollbars(a); a.recycle(); } public AbsListView(Context context, AttributeSet attrs) { this(context, attrs, R.attr.absListViewStyle); } public AbsListView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initAbsListView(); TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AbsListView, defStyle, 0); Drawable d = a.getDrawable(R.styleable.AbsListView_listSelector); if (d != null) { setSelector(d); } mDrawSelectorOnTop = a.getBoolean(R.styleable.AbsListView_drawSelectorOnTop, false); boolean stackFromBottom = a.getBoolean(R.styleable.AbsListView_stackFromBottom, false); setStackFromBottom(stackFromBottom); boolean scrollingCacheEnabled = a.getBoolean(R.styleable.AbsListView_scrollingCache, true); setScrollingCacheEnabled(scrollingCacheEnabled); boolean useTextFilter = a.getBoolean(R.styleable.AbsListView_textFilterEnabled, false); setTextFilterEnabled(useTextFilter); int transcriptMode = a.getInt(R.styleable.AbsListView_transcriptMode, TRANSCRIPT_MODE_DISABLED); setTranscriptMode(transcriptMode); int color = a.getColor(R.styleable.AbsListView_cacheColorHint, 0); setCacheColorHint(color); boolean enableFastScroll = a.getBoolean(R.styleable.AbsListView_fastScrollEnabled, false); setFastScrollEnabled(enableFastScroll); boolean smoothScrollbar = a.getBoolean(R.styleable.AbsListView_smoothScrollbar, true); setSmoothScrollbarEnabled(smoothScrollbar); setChoiceMode(a.getInt(R.styleable.AbsListView_choiceMode, CHOICE_MODE_NONE)); setFastScrollAlwaysVisible(a.getBoolean(R.styleable.AbsListView_fastScrollAlwaysVisible, false)); a.recycle(); } private void initAbsListView() { // Setting focusable in touch mode will set the focusable property to true setClickable(true); setFocusableInTouchMode(true); setWillNotDraw(false); setAlwaysDrawnWithCacheEnabled(false); setScrollingCacheEnabled(true); final Context context = getContext(); final ViewConfiguration configuration = ViewConfiguration.get(context); mTouchSlop = configuration.getScaledTouchSlop(); mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); mOverscrollDistance = configuration.getScaledOverscrollDistance(); mOverflingDistance = configuration.getScaledOverflingDistance(); mDensityScale = context.getResources().getDisplayMetrics().density; } @Override public void setOverScrollMode(int mode) { if (mode != OVER_SCROLL_NEVER) { if (mEdgeGlowTop == null) { Context context = getContext(); mEdgeGlowTop = new EdgeEffectCompat(context); mEdgeGlowBottom = new EdgeEffectCompat(context); } } else { mEdgeGlowTop = null; mEdgeGlowBottom = null; } super.setOverScrollMode(mode); } /** * {@inheritDoc} */ @Override public void setAdapter(ListAdapter adapter) { if (adapter != null) { mAdapterHasStableIds = mAdapter.hasStableIds(); if (mChoiceMode != CHOICE_MODE_NONE && mAdapterHasStableIds && mCheckedIdStates == null) { mCheckedIdStates = new LongSparseArray<Integer>(); } } mTouchMode = TOUCH_MODE_REST; if (mCheckStates != null) { mCheckStates.clear(); } if (mCheckedIdStates != null) { mCheckedIdStates.clear(); } } /** * Returns the number of items currently selected. This will only be valid * if the choice mode is not {@link #CHOICE_MODE_NONE} (default). * * <p>To determine the specific items that are currently selected, use one of * the <code>getChecked*</code> methods. * * @return The number of items currently selected * * @see #getCheckedItemPosition() * @see #getCheckedItemPositions() * @see #getCheckedItemIds() */ public int getCheckedItemCount() { return mCheckedItemCount; } /** * Returns the checked state of the specified position. The result is only * valid if the choice mode has been set to {@link #CHOICE_MODE_SINGLE} * or {@link #CHOICE_MODE_MULTIPLE}. * * @param position The item whose checked state to return * @return The item's checked state or <code>false</code> if choice mode * is invalid * * @see #setChoiceMode(int) */ public boolean isItemChecked(int position) { if (mChoiceMode != CHOICE_MODE_NONE && mCheckStates != null) { return mCheckStates.get(position); } return false; } /** * Returns the currently checked item. The result is only valid if the choice * mode has been set to {@link #CHOICE_MODE_SINGLE}. * * @return The position of the currently checked item or * {@link #INVALID_POSITION} if nothing is selected * * @see #setChoiceMode(int) */ public int getCheckedItemPosition() { if (mChoiceMode == CHOICE_MODE_SINGLE && mCheckStates != null && mCheckStates.size() == 1) { return mCheckStates.keyAt(0); } return INVALID_POSITION; } /** * Returns the set of checked items in the list. The result is only valid if * the choice mode has not been set to {@link #CHOICE_MODE_NONE}. * * @return A SparseBooleanArray which will return true for each call to * get(int position) where position is a position in the list, * or <code>null</code> if the choice mode is set to * {@link #CHOICE_MODE_NONE}. */ public SparseBooleanArray getCheckedItemPositions() { if (mChoiceMode != CHOICE_MODE_NONE) { return mCheckStates; } return null; } /** * Returns the set of checked items ids. The result is only valid if the * choice mode has not been set to {@link #CHOICE_MODE_NONE} and the adapter * has stable IDs. ({@link ListAdapter#hasStableIds()} == {@code true}) * * @return A new array which contains the id of each checked item in the * list. */ public long[] getCheckedItemIds() { if (mChoiceMode == CHOICE_MODE_NONE || mCheckedIdStates == null || mAdapter == null) { return new long[0]; } final LongSparseArray<Integer> idStates = mCheckedIdStates; final int count = idStates.size(); final long[] ids = new long[count]; for (int i = 0; i < count; i++) { ids[i] = idStates.keyAt(i); } return ids; } /** * Clear any choices previously set */ public void clearChoices() { if (mCheckStates != null) { mCheckStates.clear(); } if (mCheckedIdStates != null) { mCheckedIdStates.clear(); } mCheckedItemCount = 0; } /** * Sets the checked state of the specified position. The is only valid if * the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or * {@link #CHOICE_MODE_MULTIPLE}. * * @param position The item whose checked state is to be checked * @param value The new checked state for the item */ public void setItemChecked(int position, boolean value) { if (mChoiceMode == CHOICE_MODE_NONE) { return; } // Start selection mode if needed. We don't need to if we're unchecking something. if (value && mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode == null) { if (mMultiChoiceModeCallback == null || !mMultiChoiceModeCallback.hasWrappedCallback()) { throw new IllegalStateException("AbsListView: attempted to start selection mode " + "for CHOICE_MODE_MULTIPLE_MODAL but no choice mode callback was " + "supplied. Call setMultiChoiceModeListener to set a callback."); } mChoiceActionMode = startActionModeCompat(mMultiChoiceModeCallback); } if (mChoiceMode == CHOICE_MODE_MULTIPLE || mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { boolean oldValue = mCheckStates.get(position); mCheckStates.put(position, value); if (mCheckedIdStates != null && mAdapter.hasStableIds()) { if (value) { mCheckedIdStates.put(mAdapter.getItemId(position), position); } else { mCheckedIdStates.delete(mAdapter.getItemId(position)); } } if (oldValue != value) { if (value) { mCheckedItemCount++; } else { mCheckedItemCount--; } } if (mChoiceActionMode != null) { final long id = mAdapter.getItemId(position); mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, position, id, value); } } else { boolean updateIds = mCheckedIdStates != null && mAdapter.hasStableIds(); // Clear all values if we're checking something, or unchecking the currently // selected item if (value || isItemChecked(position)) { mCheckStates.clear(); if (updateIds) { mCheckedIdStates.clear(); } } // this may end up selecting the value we just cleared but this way // we ensure length of mCheckStates is 1, a fact getCheckedItemPosition relies on if (value) { mCheckStates.put(position, true); if (updateIds) { mCheckedIdStates.put(mAdapter.getItemId(position), position); } mCheckedItemCount = 1; } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) { mCheckedItemCount = 0; } } // Do not generate a data change while we are in the layout phase if (!mInLayout && !mBlockLayoutRequests) { mDataChanged = true; rememberSyncState(); requestLayout(); } } @Override public boolean performItemClick(View view, int position, long id) { boolean handled = false; boolean dispatchItemClick = true; if (mChoiceMode != CHOICE_MODE_NONE) { handled = true; boolean checkedStateChanged = false; if (mChoiceMode == CHOICE_MODE_MULTIPLE || (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode != null)) { boolean checked = !mCheckStates.get(position, false); mCheckStates.put(position, checked); if (mCheckedIdStates != null && mAdapter.hasStableIds()) { if (checked) { mCheckedIdStates.put(mAdapter.getItemId(position), position); } else { mCheckedIdStates.delete(mAdapter.getItemId(position)); } } if (checked) { mCheckedItemCount++; } else { mCheckedItemCount--; } if (mChoiceActionMode != null) { mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, position, id, checked); dispatchItemClick = false; } checkedStateChanged = true; } else if (mChoiceMode == CHOICE_MODE_SINGLE) { boolean checked = !mCheckStates.get(position, false); if (checked) { mCheckStates.clear(); mCheckStates.put(position, true); if (mCheckedIdStates != null && mAdapter.hasStableIds()) { mCheckedIdStates.clear(); mCheckedIdStates.put(mAdapter.getItemId(position), position); } mCheckedItemCount = 1; } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) { mCheckedItemCount = 0; } checkedStateChanged = true; } if (checkedStateChanged) { updateOnScreenCheckedViews(); } } if (dispatchItemClick) { handled |= super.performItemClick(view, position, id); } return handled; } /** * Perform a quick, in-place update of the checked or activated state * on all visible item views. This should only be called when a valid * choice mode is active. */ private void updateOnScreenCheckedViews() { final int firstPos = mFirstPosition; final int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); final int position = firstPos + i; if (child instanceof Checkable) { ((Checkable) child).setChecked(mCheckStates.get(position)); } else { Compat.setActivated(child, mCheckStates.get(position)); } } } /** * @see #setChoiceMode(int) * * @return The current choice mode */ public int getChoiceMode() { return mChoiceMode; } /** * Defines the choice behavior for the List. By default, Lists do not have any choice behavior * ({@link #CHOICE_MODE_NONE}). By setting the choiceMode to {@link #CHOICE_MODE_SINGLE}, the * List allows up to one item to be in a chosen state. By setting the choiceMode to * {@link #CHOICE_MODE_MULTIPLE}, the list allows any number of items to be chosen. * * @param choiceMode One of {@link #CHOICE_MODE_NONE}, {@link #CHOICE_MODE_SINGLE}, or * {@link #CHOICE_MODE_MULTIPLE} */ public void setChoiceMode(int choiceMode) { mChoiceMode = choiceMode; if (mChoiceActionMode != null) { mChoiceActionMode.finish(); mChoiceActionMode = null; } if (mChoiceMode != CHOICE_MODE_NONE) { if (mCheckStates == null) { mCheckStates = new SparseBooleanArray(); } if (mCheckedIdStates == null && mAdapter != null && mAdapter.hasStableIds()) { mCheckedIdStates = new LongSparseArray<Integer>(); } // Modal multi-choice mode only has choices when the mode is active. Clear them. if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { clearChoices(); setLongClickable(true); } } } /** * Set a {@link MultiChoiceModeListener} that will manage the lifecycle of the * selection {@link ActionMode}. Only used when the choice mode is set to * {@link #CHOICE_MODE_MULTIPLE_MODAL}. * * @param listener Listener that will manage the selection mode * * @see #setChoiceMode(int) */ public void setMultiChoiceModeListener(MultiChoiceModeListener listener) { if (mMultiChoiceModeCallback == null) { mMultiChoiceModeCallback = new MultiChoiceModeWrapper(); } mMultiChoiceModeCallback.setWrapped(listener); } /** * @return true if all list content currently fits within the view boundaries */ private boolean contentFits() { final int childCount = getChildCount(); if (childCount == 0) return true; if (childCount != mItemCount) return false; return getChildAt(0).getTop() >= mListPadding.top && getChildAt(childCount - 1).getBottom() <= getHeight() - mListPadding.bottom; } /** * Enables fast scrolling by letting the user quickly scroll through lists by * dragging the fast scroll thumb. The adapter attached to the list may want * to implement {@link android.widget.SectionIndexer} if it wishes to display alphabet preview and * jump between sections of the list. * @see android.widget.SectionIndexer * @see #isFastScrollEnabled() * @param enabled whether or not to enable fast scrolling */ public void setFastScrollEnabled(boolean enabled) { mFastScrollEnabled = enabled; if (enabled) { if (mFastScroller == null) { mFastScroller = new FastScroller(getContext(), this); } } else { if (mFastScroller != null) { mFastScroller.stop(); mFastScroller = null; } } } /** * Set whether or not the fast scroller should always be shown in place of the * standard scrollbars. Fast scrollers shown in this way will not fade out and will * be a permanent fixture within the list. Best combined with an inset scroll bar style * that will ensure enough padding. This will enable fast scrolling if it is not * already enabled. * * @param alwaysShow true if the fast scroller should always be displayed. * @see #setScrollBarStyle(int) * @see #setFastScrollEnabled(boolean) */ public void setFastScrollAlwaysVisible(boolean alwaysShow) { if (alwaysShow && !mFastScrollEnabled) { setFastScrollEnabled(true); } if (mFastScroller != null) { mFastScroller.setAlwaysShow(alwaysShow); } // TODO I think it is no so important (j.m.) // computeOpaqueFlags(); // recomputePadding(); } /** * Returns true if the fast scroller is set to always show on this view rather than * fade out when not in use. * * @return true if the fast scroller will always show. * @see #setFastScrollAlwaysVisible(boolean) */ public boolean isFastScrollAlwaysVisible() { return mFastScrollEnabled && mFastScroller.isAlwaysShowEnabled(); } @Override public int getVerticalScrollbarWidth() { if (isFastScrollAlwaysVisible()) { return Math.max(super.getVerticalScrollbarWidth(), mFastScroller.getWidth()); } return super.getVerticalScrollbarWidth(); } /** * Returns the current state of the fast scroll feature. * @see #setFastScrollEnabled(boolean) * @return true if fast scroll is enabled, false otherwise */ @ViewDebug.ExportedProperty public boolean isFastScrollEnabled() { return mFastScrollEnabled; } @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public void setVerticalScrollbarPosition(int position) { super.setVerticalScrollbarPosition(position); if (mFastScroller != null) { mFastScroller.setScrollbarPosition(position); } } /** * If fast scroll is visible, then don't draw the vertical scrollbar. * @hide */ // FIXME revmoed because I think it is not so important (j.m.) // @Override // protected boolean isVerticalScrollBarHidden() { // return mFastScroller != null && mFastScroller.isVisible(); // } /** * When smooth scrollbar is enabled, the position and size of the scrollbar thumb * is computed based on the number of visible pixels in the visible items. This * however assumes that all list items have the same width. If you use a list in * which items have different heights, the scrollbar will change appearance as the * user scrolls through the list. To avoid this issue, you need to disable this * property. * * When smooth scrollbar is disabled, the position and size of the scrollbar thumb * is based solely on the number of items in the adapter and the position of the * visible items inside the adapter. This provides a stable scrollbar as the user * navigates through a list of items with varying heights. * * @param enabled Whether or not to enable smooth scrollbar. * * @see #setSmoothScrollbarEnabled(boolean) * @attr ref android.R.styleable#AbsListView_smoothScrollbar */ public void setSmoothScrollbarEnabled(boolean enabled) { mSmoothScrollbarEnabled = enabled; } /** * Returns the current state of the fast scroll feature. * * @return True if smooth scrollbar is enabled is enabled, false otherwise. * * @see #setSmoothScrollbarEnabled(boolean) */ @ViewDebug.ExportedProperty public boolean isSmoothScrollbarEnabled() { return mSmoothScrollbarEnabled; } /** * Set the listener that will receive notifications every time the list scrolls. * * @param l the scroll listener */ public void setOnScrollListener(OnScrollListener l) { mOnScrollListener = l; invokeOnItemScrollListener(); } /** * Notify our scroll listener (if there is one) of a change in scroll state */ void invokeOnItemScrollListener() { if (mFastScroller != null) { mFastScroller.onScroll(mFirstPosition, getChildCount(), mItemCount); } if (mOnScrollListener != null) { mOnScrollListener.onScroll(this, mFirstPosition, getChildCount(), mItemCount); } onScrollChanged(0, 0, 0, 0); // dummy values, View's implementation does not use these. } @Override public void sendAccessibilityEvent(int eventType) { // Since this class calls onScrollChanged even if the mFirstPosition and the // child count have not changed we will avoid sending duplicate accessibility // events. if (eventType == AccessibilityEvent.TYPE_VIEW_SCROLLED) { final int firstVisiblePosition = getFirstVisiblePosition(); final int lastVisiblePosition = getLastVisiblePosition(); if (mLastAccessibilityScrollEventFromIndex == firstVisiblePosition && mLastAccessibilityScrollEventToIndex == lastVisiblePosition) { return; } else { mLastAccessibilityScrollEventFromIndex = firstVisiblePosition; mLastAccessibilityScrollEventToIndex = lastVisiblePosition; } } super.sendAccessibilityEvent(eventType); } @Override public void onInitializeAccessibilityEvent(AccessibilityEvent event) { super.onInitializeAccessibilityEvent(event); event.setClassName(AbsListView.class.getName()); } @Override @TargetApi(Build.VERSION_CODES.JELLY_BEAN) public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { super.onInitializeAccessibilityNodeInfo(info); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) { info.setClassName(AbsListView.class.getName()); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { if (isEnabled()) { if (getFirstVisiblePosition() > 0) { info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); } if (getLastVisiblePosition() < getCount() - 1) { info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); } } } } @TargetApi(Build.VERSION_CODES.JELLY_BEAN) @Override public boolean performAccessibilityAction(int action, Bundle arguments) { if (super.performAccessibilityAction(action, arguments)) { return true; } switch (action) { case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { if (isEnabled() && getLastVisiblePosition() < getCount() - 1) { final int viewportHeight = getHeight() - mListPadding.top - mListPadding.bottom; smoothScrollBy(viewportHeight, PositionScroller.SCROLL_DURATION); return true; } } return false; case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { if (isEnabled() && mFirstPosition > 0) { final int viewportHeight = getHeight() - mListPadding.top - mListPadding.bottom; smoothScrollBy(-viewportHeight, PositionScroller.SCROLL_DURATION); return true; } } return false; } return false; } /** * Indicates whether the children's drawing cache is used during a scroll. * By default, the drawing cache is enabled but this will consume more memory. * * @return true if the scrolling cache is enabled, false otherwise * * @see #setScrollingCacheEnabled(boolean) * @see View#setDrawingCacheEnabled(boolean) */ @ViewDebug.ExportedProperty public boolean isScrollingCacheEnabled() { return mScrollingCacheEnabled; } /** * Enables or disables the children's drawing cache during a scroll. * By default, the drawing cache is enabled but this will use more memory. * * When the scrolling cache is enabled, the caches are kept after the * first scrolling. You can manually clear the cache by calling * {@link android.view.ViewGroup#setChildrenDrawingCacheEnabled(boolean)}. * * @param enabled true to enable the scroll cache, false otherwise * * @see #isScrollingCacheEnabled() * @see View#setDrawingCacheEnabled(boolean) */ public void setScrollingCacheEnabled(boolean enabled) { if (mScrollingCacheEnabled && !enabled) { clearScrollingCache(); } mScrollingCacheEnabled = enabled; } /** * Enables or disables the type filter window. If enabled, typing when * this view has focus will filter the children to match the users input. * Note that the {@link android.widget.Adapter} used by this view must implement the * {@link Filterable} interface. * * @param textFilterEnabled true to enable type filtering, false otherwise * * @see Filterable */ public void setTextFilterEnabled(boolean textFilterEnabled) { mTextFilterEnabled = textFilterEnabled; } /** * Indicates whether type filtering is enabled for this view * * @return true if type filtering is enabled, false otherwise * * @see #setTextFilterEnabled(boolean) * @see Filterable */ @ViewDebug.ExportedProperty public boolean isTextFilterEnabled() { return mTextFilterEnabled; } @Override public void getFocusedRect(Rect r) { View view = getSelectedView(); if (view != null && view.getParent() == this) { // the focused rectangle of the selected view offset into the // coordinate space of this view. view.getFocusedRect(r); offsetDescendantRectToMyCoords(view, r); } else { // otherwise, just the norm super.getFocusedRect(r); } } private void useDefaultSelector() { setSelector(getResources().getDrawable(android.R.drawable.list_selector_background)); } /** * Indicates whether the content of this view is pinned to, or stacked from, * the bottom edge. * * @return true if the content is stacked from the bottom edge, false otherwise */ @ViewDebug.ExportedProperty public boolean isStackFromBottom() { return mStackFromBottom; } /** * When stack from bottom is set to true, the list fills its content starting from * the bottom of the view. * * @param stackFromBottom true to pin the view's content to the bottom edge, * false to pin the view's content to the top edge */ public void setStackFromBottom(boolean stackFromBottom) { if (mStackFromBottom != stackFromBottom) { mStackFromBottom = stackFromBottom; requestLayoutIfNecessary(); } } void requestLayoutIfNecessary() { if (getChildCount() > 0) { resetList(); requestLayout(); invalidate(); } } static class SavedState extends BaseSavedState { long selectedId; long firstId; int viewTop; int position; int height; String filter; boolean inActionMode; int checkedItemCount; SparseBooleanArray checkState; LongSparseArray<Integer> checkIdState; /** * Constructor called from {@link AbsListView#onSaveInstanceState()} */ SavedState(Parcelable superState) { super(superState); } /** * Constructor called from {@link #CREATOR} */ private SavedState(Parcel in) { super(in); selectedId = in.readLong(); firstId = in.readLong(); viewTop = in.readInt(); position = in.readInt(); height = in.readInt(); filter = in.readString(); inActionMode = in.readByte() != 0; checkedItemCount = in.readInt(); checkState = in.readSparseBooleanArray(); final int N = in.readInt(); if (N > 0) { checkIdState = new LongSparseArray<Integer>(); for (int i = 0; i < N; i++) { final long key = in.readLong(); final int value = in.readInt(); checkIdState.put(key, value); } } } @Override public void writeToParcel(Parcel out, int flags) { super.writeToParcel(out, flags); out.writeLong(selectedId); out.writeLong(firstId); out.writeInt(viewTop); out.writeInt(position); out.writeInt(height); out.writeString(filter); out.writeByte((byte) (inActionMode ? 1 : 0)); out.writeInt(checkedItemCount); out.writeSparseBooleanArray(checkState); final int N = checkIdState != null ? checkIdState.size() : 0; out.writeInt(N); for (int i = 0; i < N; i++) { out.writeLong(checkIdState.keyAt(i)); out.writeInt(checkIdState.valueAt(i)); } } @Override public String toString() { return "AbsListView.SavedState{" + Integer.toHexString(System.identityHashCode(this)) + " selectedId=" + selectedId + " firstId=" + firstId + " viewLeft=" + viewTop + " position=" + position + " width=" + height + " filter=" + filter + " checkState=" + checkState + "}"; } public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() { public SavedState createFromParcel(Parcel in) { return new SavedState(in); } public SavedState[] newArray(int size) { return new SavedState[size]; } }; } @Override public Parcelable onSaveInstanceState() { /* * This doesn't really make sense as the place to dismiss the * popups, but there don't seem to be any other useful hooks * that happen early enough to keep from getting complaints * about having leaked the window. */ dismissPopup(); Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); if (mPendingSync != null) { // Just keep what we last restored. ss.selectedId = mPendingSync.selectedId; ss.firstId = mPendingSync.firstId; ss.viewTop = mPendingSync.viewTop; ss.position = mPendingSync.position; ss.height = mPendingSync.height; ss.filter = mPendingSync.filter; ss.inActionMode = mPendingSync.inActionMode; ss.checkedItemCount = mPendingSync.checkedItemCount; ss.checkState = mPendingSync.checkState; ss.checkIdState = mPendingSync.checkIdState; return ss; } boolean haveChildren = getChildCount() > 0 && mItemCount > 0; long selectedId = getSelectedItemId(); ss.selectedId = selectedId; ss.height = getHeight(); if (selectedId >= 0) { // Remember the selection ss.viewTop = mSelectedTop; ss.position = getSelectedItemPosition(); ss.firstId = INVALID_POSITION; } else { if (haveChildren && mFirstPosition >= 0) { // Remember the position of the first child. // We only do this if we are not currently at the top of // the list, for two reasons: // (1) The list may be in the process of becoming empty, in // which case mItemCount may not be 0, but if we try to // ask for any information about position 0 we will crash. // (2) Being "at the top" seems like a special case, anyway, // and the user wouldn't expect to end up somewhere else when // they revisit the list even if its content has changed. View v = getChildAt(0); ss.viewTop = v.getTop(); int firstPos = mFirstPosition; if (firstPos >= mItemCount) { firstPos = mItemCount - 1; } ss.position = firstPos; ss.firstId = mAdapter.getItemId(firstPos); } else { ss.viewTop = 0; ss.firstId = INVALID_POSITION; ss.position = 0; } } ss.filter = null; if (mFiltered) { final EditText textFilter = mTextFilter; if (textFilter != null) { Editable filterText = textFilter.getText(); if (filterText != null) { ss.filter = filterText.toString(); } } } ss.inActionMode = mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mChoiceActionMode != null; if (mCheckStates != null) { ss.checkState = mCheckStates.clone(); } if (mCheckedIdStates != null) { final LongSparseArray<Integer> idState = new LongSparseArray<Integer>(); final int count = mCheckedIdStates.size(); for (int i = 0; i < count; i++) { idState.put(mCheckedIdStates.keyAt(i), mCheckedIdStates.valueAt(i)); } ss.checkIdState = idState; } ss.checkedItemCount = mCheckedItemCount; return ss; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState ss = (SavedState) state; super.onRestoreInstanceState(ss.getSuperState()); mDataChanged = true; mSyncHeight = ss.height; if (ss.selectedId >= 0) { mNeedSync = true; mPendingSync = ss; mSyncRowId = ss.selectedId; mSyncPosition = ss.position; mSpecificTop = ss.viewTop; mSyncMode = SYNC_SELECTED_POSITION; } else if (ss.firstId >= 0) { setSelectedPositionInt(INVALID_POSITION); // Do this before setting mNeedSync since setNextSelectedPosition looks at mNeedSync setNextSelectedPositionInt(INVALID_POSITION); mSelectorPosition = INVALID_POSITION; mNeedSync = true; mPendingSync = ss; mSyncRowId = ss.firstId; mSyncPosition = ss.position; mSpecificTop = ss.viewTop; mSyncMode = SYNC_FIRST_POSITION; } setFilterText(ss.filter); if (ss.checkState != null) { mCheckStates = ss.checkState; } if (ss.checkIdState != null) { mCheckedIdStates = ss.checkIdState; } mCheckedItemCount = ss.checkedItemCount; if (ss.inActionMode && mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL && mMultiChoiceModeCallback != null) { mChoiceActionMode = startActionModeCompat(mMultiChoiceModeCallback); } requestLayout(); } private boolean acceptFilter() { return mTextFilterEnabled && getAdapter() instanceof Filterable && ((Filterable) getAdapter()).getFilter() != null; } /** * Sets the initial value for the text filter. * @param filterText The text to use for the filter. * * @see #setTextFilterEnabled */ public void setFilterText(String filterText) { // TODO: Should we check for acceptFilter()? if (mTextFilterEnabled && !TextUtils.isEmpty(filterText)) { createTextFilter(false); // This is going to call our listener onTextChanged, but we might not // be ready to bring up a window yet mTextFilter.setText(filterText); mTextFilter.setSelection(filterText.length()); if (mAdapter instanceof Filterable) { // if mPopup is non-null, then onTextChanged will do the filtering if (mPopup == null) { Filter f = ((Filterable) mAdapter).getFilter(); f.filter(filterText); } // Set filtered to true so we will display the filter window when our main // window is ready mFiltered = true; mDataSetObserver.clearSavedState(); } } } /** * Returns the list's text filter, if available. * @return the list's text filter or null if filtering isn't enabled */ public CharSequence getTextFilter() { if (mTextFilterEnabled && mTextFilter != null) { return mTextFilter.getText(); } return null; } @Override protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) { if (!mIsAttached && mAdapter != null) { // Data may have changed while we were detached and it's valid // to change focus while detached. Refresh so we don't die. mDataChanged = true; mOldItemCount = mItemCount; mItemCount = mAdapter.getCount(); } resurrectSelection(); } } @Override public void requestLayout() { if (!mBlockLayoutRequests && !mInLayout) { super.requestLayout(); } } /** * The list is empty. Clear everything out. */ void resetList() { removeAllViewsInLayout(); mFirstPosition = 0; mDataChanged = false; mPositionScrollAfterLayout = null; mNeedSync = false; mPendingSync = null; mOldSelectedPosition = INVALID_POSITION; mOldSelectedRowId = INVALID_ROW_ID; setSelectedPositionInt(INVALID_POSITION); setNextSelectedPositionInt(INVALID_POSITION); mSelectedTop = 0; mSelectorPosition = INVALID_POSITION; mSelectorRect.setEmpty(); invalidate(); } @Override protected int computeVerticalScrollExtent() { final int count = getChildCount(); if (count > 0) { if (mSmoothScrollbarEnabled) { int extent = count * 100; View view = getChildAt(0); final int top = view.getTop(); int height = view.getHeight(); if (height > 0) { extent += (top * 100) / height; } view = getChildAt(count - 1); final int bottom = view.getBottom(); height = view.getHeight(); if (height > 0) { extent -= ((bottom - getHeight()) * 100) / height; } return extent; } else { return 1; } } return 0; } @Override protected int computeVerticalScrollOffset() { final int firstPosition = mFirstPosition; final int childCount = getChildCount(); if (firstPosition >= 0 && childCount > 0) { if (mSmoothScrollbarEnabled) { final View view = getChildAt(0); final int top = view.getTop(); int height = view.getHeight(); if (height > 0) { final int scrollY = getScrollY(); return Math.max(firstPosition * 100 - (top * 100) / height + (int) ((float) scrollY / getHeight() * mItemCount * 100), 0); } } else { int index; final int count = mItemCount; if (firstPosition == 0) { index = 0; } else if (firstPosition + childCount == count) { index = count; } else { index = firstPosition + childCount / 2; } return (int) (firstPosition + childCount * (index / (float) count)); } } return 0; } @Override protected int computeVerticalScrollRange() { int result; if (mSmoothScrollbarEnabled) { result = Math.max(mItemCount * 100, 0); final int scrollY = getScrollY(); if (scrollY != 0) { // Compensate for overscroll result += Math.abs((int) ((float) scrollY / getHeight() * mItemCount * 100)); } } else { result = mItemCount; } return result; } @Override protected float getTopFadingEdgeStrength() { final int count = getChildCount(); final float fadeEdge = super.getTopFadingEdgeStrength(); if (count == 0) { return fadeEdge; } else { if (mFirstPosition > 0) { return 1.0f; } final int top = getChildAt(0).getTop(); final float fadeLength = (float) getVerticalFadingEdgeLength(); final int paddingTop = getPaddingTop(); return top < paddingTop ? (float) -(top - paddingTop) / fadeLength : fadeEdge; } } @Override protected float getBottomFadingEdgeStrength() { final int count = getChildCount(); final float fadeEdge = super.getBottomFadingEdgeStrength(); if (count == 0) { return fadeEdge; } else { if (mFirstPosition + count - 1 < mItemCount - 1) { return 1.0f; } final int bottom = getChildAt(count - 1).getBottom(); final int height = getHeight(); final float fadeLength = (float) getVerticalFadingEdgeLength(); final int paddingBottom = getPaddingBottom(); return bottom > height - paddingBottom ? (float) (bottom - height + paddingBottom) / fadeLength : fadeEdge; } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mSelector == null) { useDefaultSelector(); } final Rect listPadding = mListPadding; listPadding.left = mSelectionLeftPadding + getPaddingLeft(); listPadding.top = mSelectionTopPadding + getPaddingTop(); listPadding.right = mSelectionRightPadding + getPaddingRight(); listPadding.bottom = mSelectionBottomPadding + getPaddingBottom(); // Check if our previous measured size was at a point where we should scroll later. if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) { final int childCount = getChildCount(); final int listBottom = getHeight() - getPaddingBottom(); final View lastChild = getChildAt(childCount - 1); final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom; mForceTranscriptScroll = mFirstPosition + childCount >= mLastHandledItemCount && lastBottom <= listBottom; } } /** * Subclasses should NOT override this method but * {@link #layoutChildren()} instead. */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); // Moved from setFrame because is private (j.m.) if (changed) { // Reposition the popup when the frame has changed. This includes // translating the widget, not just changing its dimension. The // filter popup needs to follow the widget. final boolean visible = getWindowVisibility() == View.VISIBLE; if (mFiltered && visible && mPopup != null && mPopup.isShowing()) { positionPopup(); } } mInLayout = true; if (changed) { int childCount = getChildCount(); for (int i = 0; i < childCount; i++) { getChildAt(i).forceLayout(); } mRecycler.markChildrenDirty(); } if (mFastScroller != null && mItemCount != mOldItemCount) { mFastScroller.onItemCountChanged(mOldItemCount, mItemCount); } layoutChildren(); mInLayout = false; mOverscrollMax = (b - t) / OVERSCROLL_LIMIT_DIVISOR; } /** * Subclasses must override this method to layout their children. */ protected void layoutChildren() { } void updateScrollIndicators() { if (mScrollUp != null) { boolean canScrollUp; // 0th element is not visible canScrollUp = mFirstPosition > 0; // ... Or top of 0th element is not visible if (!canScrollUp) { if (getChildCount() > 0) { View child = getChildAt(0); canScrollUp = child.getTop() < mListPadding.top; } } mScrollUp.setVisibility(canScrollUp ? View.VISIBLE : View.INVISIBLE); } if (mScrollDown != null) { boolean canScrollDown; int count = getChildCount(); // Last item is not visible canScrollDown = (mFirstPosition + count) < mItemCount; // ... Or bottom of the last element is not visible if (!canScrollDown && count > 0) { View child = getChildAt(count - 1); final int bottom = getBottom(); canScrollDown = child.getBottom() > bottom - mListPadding.bottom; } mScrollDown.setVisibility(canScrollDown ? View.VISIBLE : View.INVISIBLE); } } @Override @ViewDebug.ExportedProperty public View getSelectedView() { if (mItemCount > 0 && mSelectedPosition >= 0) { return getChildAt(mSelectedPosition - mFirstPosition); } else { return null; } } /** * List padding is the maximum of the normal view's padding and the padding of the selector. * * @see android.view.View#getPaddingTop() * @see #getSelector() * * @return The top list padding. */ public int getListPaddingTop() { return mListPadding.top; } /** * List padding is the maximum of the normal view's padding and the padding of the selector. * * @see android.view.View#getPaddingBottom() * @see #getSelector() * * @return The bottom list padding. */ public int getListPaddingBottom() { return mListPadding.bottom; } /** * List padding is the maximum of the normal view's padding and the padding of the selector. * * @see android.view.View#getPaddingLeft() * @see #getSelector() * * @return The left list padding. */ public int getListPaddingLeft() { return mListPadding.left; } /** * List padding is the maximum of the normal view's padding and the padding of the selector. * * @see android.view.View#getPaddingRight() * @see #getSelector() * * @return The right list padding. */ public int getListPaddingRight() { return mListPadding.right; } /** * Get a view and have it show the data associated with the specified * position. This is called when we have already discovered that the view is * not available for reuse in the recycle bin. The only choices left are * converting an old view or making a new one. * * @param position The position to display * @param isScrap Array of at least 1 boolean, the first entry will become true if * the returned view was taken from the scrap heap, false if otherwise. * * @return A view displaying the data associated with the specified position */ View obtainView(int position, boolean[] isScrap) { isScrap[0] = false; View scrapView; scrapView = mRecycler.getTransientStateView(position); if (scrapView != null) { return scrapView; } scrapView = mRecycler.getScrapView(position); View child; if (scrapView != null) { child = mAdapter.getView(position, scrapView, this); if (ViewCompat.getImportantForAccessibility(child) == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { ViewCompat.setImportantForAccessibility(child, IMPORTANT_FOR_ACCESSIBILITY_YES); } if (child != scrapView) { mRecycler.addScrapView(scrapView, position); if (mCacheColorHint != 0) { child.setDrawingCacheBackgroundColor(mCacheColorHint); } } else { isScrap[0] = true; AdapterView.dispatchStartTemporaryDetach(child); } } else { child = mAdapter.getView(position, null, this); if (ViewCompat.getImportantForAccessibility(child) == IMPORTANT_FOR_ACCESSIBILITY_AUTO) { ViewCompat.setImportantForAccessibility(child, IMPORTANT_FOR_ACCESSIBILITY_YES); } if (mCacheColorHint != 0) { child.setDrawingCacheBackgroundColor(mCacheColorHint); } } if (mAdapterHasStableIds) { final ViewGroup.LayoutParams vlp = child.getLayoutParams(); LayoutParams lp; if (vlp == null) { lp = (LayoutParams) generateDefaultLayoutParams(); } else if (!checkLayoutParams(vlp)) { lp = (LayoutParams) generateLayoutParams(vlp); } else { lp = (LayoutParams) vlp; } lp.itemId = mAdapter.getItemId(position); child.setLayoutParams(lp); } if (getAccessibilityManager().isEnabled()) { if (mAccessibilityDelegate == null) { mAccessibilityDelegate = new ListItemAccessibilityDelegate(); } ViewCompat.setAccessibilityDelegate(child, mAccessibilityDelegate); } return child; } class ListItemAccessibilityDelegate extends AccessibilityDelegateCompat { @Override public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { super.onInitializeAccessibilityNodeInfo(host, info); final int position = getPositionForView(host); final ListAdapter adapter = getAdapter(); if ((position == INVALID_POSITION) || (adapter == null)) { return; } if (!isEnabled() || !adapter.isEnabled(position)) { return; } if (position == getSelectedItemPosition()) { info.setSelected(true); info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); } else { info.addAction(AccessibilityNodeInfo.ACTION_SELECT); } if (isClickable()) { info.addAction(AccessibilityNodeInfo.ACTION_CLICK); info.setClickable(true); } if (isLongClickable()) { info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); info.setLongClickable(true); } } @Override public boolean performAccessibilityAction(View host, int action, Bundle arguments) { if (super.performAccessibilityAction(host, action, arguments)) { return true; } final int position = getPositionForView(host); final ListAdapter adapter = getAdapter(); if ((position == INVALID_POSITION) || (adapter == null)) { // Cannot perform actions on invalid items. return false; } if (!isEnabled() || !adapter.isEnabled(position)) { // Cannot perform actions on disabled items. return false; } final long id = getItemIdAtPosition(position); switch (action) { case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { if (getSelectedItemPosition() == position) { setSelection(INVALID_POSITION); return true; } } return false; case AccessibilityNodeInfo.ACTION_SELECT: { if (getSelectedItemPosition() != position) { setSelection(position); return true; } } return false; case AccessibilityNodeInfo.ACTION_CLICK: { if (isClickable()) { return performItemClick(host, position, id); } } return false; case AccessibilityNodeInfo.ACTION_LONG_CLICK: { if (isLongClickable()) { return performLongPress(host, position, id); } } return false; } return false; } } void positionSelector(int position, View sel) { if (position != INVALID_POSITION) { mSelectorPosition = position; } final Rect selectorRect = mSelectorRect; selectorRect.set(sel.getLeft(), sel.getTop(), sel.getRight(), sel.getBottom()); if (sel instanceof SelectionBoundsAdjuster) { ((SelectionBoundsAdjuster) sel).adjustListItemSelectionBounds(selectorRect); } positionSelector(selectorRect.left, selectorRect.top, selectorRect.right, selectorRect.bottom); final boolean isChildViewEnabled = mIsChildViewEnabled; if (sel.isEnabled() != isChildViewEnabled) { mIsChildViewEnabled = !isChildViewEnabled; if (getSelectedItemPosition() != INVALID_POSITION) { refreshDrawableState(); } } } private void positionSelector(int l, int t, int r, int b) { mSelectorRect.set(l - mSelectionLeftPadding, t - mSelectionTopPadding, r + mSelectionRightPadding, b + mSelectionBottomPadding); } @Override protected void dispatchDraw(Canvas canvas) { int saveCount = 0; final boolean clipToPadding = mClipToPadding; if (clipToPadding) { saveCount = canvas.save(); final int scrollX = getScrollX(); final int scrollY = getScrollY(); final int paddingLeft = getPaddingLeft(); final int paddingTop = getPaddingTop(); final int paddingRight = getPaddingRight(); final int paddingBottom = getPaddingBottom(); final int left = getLeft(); final int top = getTop(); final int right = getRight(); final int bottom = getBottom(); canvas.clipRect(scrollX + paddingLeft, scrollY + paddingTop, scrollX + right - left - paddingRight, scrollY + bottom - top - paddingBottom); setClipToPadding(false); } final boolean drawSelectorOnTop = mDrawSelectorOnTop; if (!drawSelectorOnTop) { drawSelector(canvas); } super.dispatchDraw(canvas); if (drawSelectorOnTop) { drawSelector(canvas); } if (clipToPadding) { canvas.restoreToCount(saveCount); setClipToPadding(true); } } @Override protected boolean isPaddingOffsetRequired() { return !mClipToPadding; } @Override protected int getLeftPaddingOffset() { return mClipToPadding ? 0 : -getPaddingLeft(); } @Override protected int getTopPaddingOffset() { return mClipToPadding ? 0 : -getPaddingTop(); } @Override protected int getRightPaddingOffset() { return mClipToPadding ? 0 : getPaddingRight(); } @Override protected int getBottomPaddingOffset() { return mClipToPadding ? 0 : getPaddingBottom(); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { if (getChildCount() > 0) { mDataChanged = true; rememberSyncState(); } if (mFastScroller != null) { mFastScroller.onSizeChanged(w, h, oldw, oldh); } } /** * @return True if the current touch mode requires that we draw the selector in the pressed * state. */ boolean touchModeDrawsInPressedState() { // FIXME use isPressed for this switch (mTouchMode) { case TOUCH_MODE_TAP: case TOUCH_MODE_DONE_WAITING: return true; default: return false; } } /** * Indicates whether this view is in a state where the selector should be drawn. This will * happen if we have focus but are not in touch mode, or we are in the middle of displaying * the pressed state for an item. * * @return True if the selector should be shown */ boolean shouldShowSelector() { return (hasFocus() && !isInTouchMode()) || touchModeDrawsInPressedState(); } private void drawSelector(Canvas canvas) { if (!mSelectorRect.isEmpty()) { final Drawable selector = mSelector; selector.setBounds(mSelectorRect); selector.draw(canvas); } } /** * Controls whether the selection highlight drawable should be drawn on top of the item or * behind it. * * @param onTop If true, the selector will be drawn on the item it is highlighting. The default * is false. * * @attr ref android.R.styleable#AbsListView_drawSelectorOnTop */ public void setDrawSelectorOnTop(boolean onTop) { mDrawSelectorOnTop = onTop; } /** * Set a Drawable that should be used to highlight the currently selected item. * * @param resID A Drawable resource to use as the selection highlight. * * @attr ref android.R.styleable#AbsListView_listSelector */ public void setSelector(int resID) { setSelector(getResources().getDrawable(resID)); } public void setSelector(Drawable sel) { if (mSelector != null) { mSelector.setCallback(null); unscheduleDrawable(mSelector); } mSelector = sel; Rect padding = new Rect(); sel.getPadding(padding); mSelectionLeftPadding = padding.left; mSelectionTopPadding = padding.top; mSelectionRightPadding = padding.right; mSelectionBottomPadding = padding.bottom; sel.setCallback(this); updateSelectorState(); } /** * Returns the selector {@link android.graphics.drawable.Drawable} that is used to draw the * selection in the list. * * @return the drawable used to display the selector */ public Drawable getSelector() { return mSelector; } /** * Sets the selector state to "pressed" and posts a CheckForKeyLongPress to see if * this is a long press. */ void keyPressed() { if (!isEnabled() || !isClickable()) { return; } Drawable selector = mSelector; Rect selectorRect = mSelectorRect; if (selector != null && (isFocused() || touchModeDrawsInPressedState()) && !selectorRect.isEmpty()) { final View v = getChildAt(mSelectedPosition - mFirstPosition); if (v != null) { if (v.hasFocusable()) return; v.setPressed(true); } setPressed(true); final boolean longClickable = isLongClickable(); Drawable d = selector.getCurrent(); if (d != null && d instanceof TransitionDrawable) { if (longClickable) { ((TransitionDrawable) d).startTransition(ViewConfiguration.getLongPressTimeout()); } else { ((TransitionDrawable) d).resetTransition(); } } if (longClickable && !mDataChanged) { if (mPendingCheckForKeyLongPress == null) { mPendingCheckForKeyLongPress = new CheckForKeyLongPress(); } mPendingCheckForKeyLongPress.rememberWindowAttachCount(); postDelayed(mPendingCheckForKeyLongPress, ViewConfiguration.getLongPressTimeout()); } } } public void setScrollIndicators(View up, View down) { mScrollUp = up; mScrollDown = down; } void updateSelectorState() { if (mSelector != null) { if (shouldShowSelector()) { mSelector.setState(getDrawableState()); } else { mSelector.setState(NOTHING_COMPAT); } } } @Override protected void drawableStateChanged() { super.drawableStateChanged(); updateSelectorState(); } @Override protected int[] onCreateDrawableState(int extraSpace) { // If the child view is enabled then do the default behavior. if (mIsChildViewEnabled) { // Common case return super.onCreateDrawableState(extraSpace); } // The selector uses this View's drawable state. The selected child view // is disabled, so we need to remove the enabled state from the drawable // states. final int enabledState = ENABLED_STATE_SET[0]; // If we don't have any extra space, it will return one of the static state arrays, // and clearing the enabled state on those arrays is a bad thing! If we specify // we need extra space, it will create+copy into a new array that safely mutable. int[] state = super.onCreateDrawableState(extraSpace + 1); int enabledPos = -1; for (int i = state.length - 1; i >= 0; i--) { if (state[i] == enabledState) { enabledPos = i; break; } } // Remove the enabled state if (enabledPos >= 0) { System.arraycopy(state, enabledPos + 1, state, enabledPos, state.length - enabledPos - 1); } return state; } @Override public boolean verifyDrawable(Drawable dr) { return mSelector == dr || super.verifyDrawable(dr); } @TargetApi(Build.VERSION_CODES.HONEYCOMB) @Override public void jumpDrawablesToCurrentState() { super.jumpDrawablesToCurrentState(); if (mSelector != null) mSelector.jumpToCurrentState(); } @Override protected void onAttachedToWindow() { super.onAttachedToWindow(); final ViewTreeObserver treeObserver = getViewTreeObserver(); treeObserver.addOnTouchModeChangeListener(this); if (mTextFilterEnabled && mPopup != null && !mGlobalLayoutListenerAddedFilter) { treeObserver.addOnGlobalLayoutListener(this); } if (mAdapter != null && mDataSetObserver == null) { mDataSetObserver = new AdapterDataSetObserver(); mAdapter.registerDataSetObserver(mDataSetObserver); // Data may have changed while we were detached. Refresh. mDataChanged = true; mOldItemCount = mItemCount; mItemCount = mAdapter.getCount(); } } @Override protected void onDetachedFromWindow() { super.onDetachedFromWindow(); // Dismiss the popup in case onSaveInstanceState() was not invoked dismissPopup(); // Detach any view left in the scrap heap mRecycler.clear(); final ViewTreeObserver treeObserver = getViewTreeObserver(); treeObserver.removeOnTouchModeChangeListener(this); if (mTextFilterEnabled && mPopup != null) { Compat.removeOnGlobalLayoutListener(treeObserver, this); mGlobalLayoutListenerAddedFilter = false; } if (mAdapter != null) { mAdapter.unregisterDataSetObserver(mDataSetObserver); mDataSetObserver = null; } // TODO we removed strict span in backport (j.m.) //if (mScrollStrictSpan != null) { // mScrollStrictSpan.finish(); // mScrollStrictSpan = null; //} //if (mFlingStrictSpan != null) { // mFlingStrictSpan.finish(); // mFlingStrictSpan = null; //} if (mFlingRunnable != null) { removeCallbacks(mFlingRunnable); } if (mPositionScroller != null) { mPositionScroller.stop(); } if (mClearScrollingCache != null) { removeCallbacks(mClearScrollingCache); } if (mPerformClick != null) { removeCallbacks(mPerformClick); } if (mTouchModeReset != null) { removeCallbacks(mTouchModeReset); mTouchModeReset.run(); } } @Override public void onWindowFocusChanged(boolean hasWindowFocus) { super.onWindowFocusChanged(hasWindowFocus); final int touchMode = isInTouchMode() ? TOUCH_MODE_ON : TOUCH_MODE_OFF; if (!hasWindowFocus) { setChildrenDrawingCacheEnabled(false); if (mFlingRunnable != null) { removeCallbacks(mFlingRunnable); // let the fling runnable report it's new state which // should be idle mFlingRunnable.endFling(); if (mPositionScroller != null) { mPositionScroller.stop(); } if (getScrollY() != 0) { scrollTo(getScrollX(), 0); invalidateParentCachesUnhide(); finishGlows(); invalidate(); } } // Always hide the type filter dismissPopup(); if (touchMode == TOUCH_MODE_OFF) { // Remember the last selected element mResurrectToPosition = mSelectedPosition; } } else { if (mFiltered && !mPopupHidden) { // Show the type filter only if a filter is in effect showPopup(); } // If we changed touch mode since the last time we had focus if (touchMode != mLastTouchMode && mLastTouchMode != TOUCH_MODE_UNKNOWN) { // If we come back in trackball mode, we bring the selection back if (touchMode == TOUCH_MODE_OFF) { // This will trigger a layout resurrectSelection(); // If we come back in touch mode, then we want to hide the selector } else { hideSelector(); mLayoutMode = LAYOUT_NORMAL; layoutChildren(); } } } mLastTouchMode = touchMode; } /** * Creates the ContextMenuInfo returned from {@link #getContextMenuInfo()}. This * methods knows the view, position and ID of the item that received the * long press. * * @param view The view that received the long press. * @param position The position of the item that received the long press. * @param id The ID of the item that received the long press. * @return The extra information that should be returned by * {@link #getContextMenuInfo()}. */ ContextMenuInfo createContextMenuInfo(View view, int position, long id) { return new AdapterContextMenuInfo(view, position, id); } /** * A base class for Runnables that will check that their view is still attached to * the original window as when the Runnable was created. * */ private class WindowRunnnable { private int mOriginalAttachCount; public void rememberWindowAttachCount() { mOriginalAttachCount = getWindowAttachCount(); } public boolean sameWindow() { return hasWindowFocus() && getWindowAttachCount() == mOriginalAttachCount; } } private class PerformClick extends WindowRunnnable implements Runnable { int mClickMotionPosition; public void run() { // The data has changed since we posted this action in the event queue, // bail out before bad things happen if (mDataChanged) return; final ListAdapter adapter = mAdapter; final int motionPosition = mClickMotionPosition; if (adapter != null && mItemCount > 0 && motionPosition != INVALID_POSITION && motionPosition < adapter.getCount() && sameWindow()) { final View view = getChildAt(motionPosition - mFirstPosition); // If there is no view, something bad happened (the view scrolled off the // screen, etc.) and we should cancel the click if (view != null) { performItemClick(view, motionPosition, adapter.getItemId(motionPosition)); } } } } private class CheckForLongPress extends WindowRunnnable implements Runnable { public void run() { final int motionPosition = mMotionPosition; final View child = getChildAt(motionPosition - mFirstPosition); if (child != null) { final int longPressPosition = mMotionPosition; final long longPressId = mAdapter.getItemId(mMotionPosition); boolean handled = false; if (sameWindow() && !mDataChanged) { handled = performLongPress(child, longPressPosition, longPressId); } if (handled) { mTouchMode = TOUCH_MODE_REST; setPressed(false); child.setPressed(false); } else { mTouchMode = TOUCH_MODE_DONE_WAITING; } } } } private class CheckForKeyLongPress extends WindowRunnnable implements Runnable { public void run() { if (isPressed() && mSelectedPosition >= 0) { int index = mSelectedPosition - mFirstPosition; View v = getChildAt(index); if (!mDataChanged) { boolean handled = false; if (sameWindow()) { handled = performLongPress(v, mSelectedPosition, mSelectedRowId); } if (handled) { setPressed(false); v.setPressed(false); } } else { setPressed(false); if (v != null) v.setPressed(false); } } } } boolean performLongPress(final View child, final int longPressPosition, final long longPressId) { // CHOICE_MODE_MULTIPLE_MODAL takes over long press. if (mChoiceMode == CHOICE_MODE_MULTIPLE_MODAL) { if (mChoiceActionMode == null && (mChoiceActionMode = startActionModeCompat(mMultiChoiceModeCallback)) != null) { setItemChecked(longPressPosition, true); performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); } return true; } boolean handled = false; if (mOnItemLongClickListener != null) { handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, child, longPressPosition, longPressId); } if (!handled) { mContextMenuInfo = createContextMenuInfo(child, longPressPosition, longPressId); handled = super.showContextMenuForChild(AbsListView.this); } if (handled) { performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); } return handled; } @Override protected ContextMenuInfo getContextMenuInfo() { return mContextMenuInfo; } // Moved to unhide method (j.m.) /** @hide */ @Override public boolean showContextMenuUnhide(float x, float y, int metaState) { final int position = pointToPosition((int) x, (int) y); if (position != INVALID_POSITION) { final long id = mAdapter.getItemId(position); View child = getChildAt(position - mFirstPosition); if (child != null) { mContextMenuInfo = createContextMenuInfo(child, position, id); return super.showContextMenuForChild(AbsListView.this); } } return super.showContextMenuUnhide(x, y, metaState); } @Override public boolean showContextMenuForChild(View originalView) { final int longPressPosition = getPositionForView(originalView); if (longPressPosition >= 0) { final long longPressId = mAdapter.getItemId(longPressPosition); boolean handled = false; if (mOnItemLongClickListener != null) { handled = mOnItemLongClickListener.onItemLongClick(AbsListView.this, originalView, longPressPosition, longPressId); } if (!handled) { mContextMenuInfo = createContextMenuInfo(getChildAt(longPressPosition - mFirstPosition), longPressPosition, longPressId); handled = super.showContextMenuForChild(originalView); } return handled; } return false; } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { return false; } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_DPAD_CENTER: case KeyEvent.KEYCODE_ENTER: if (!isEnabled()) { return true; } if (isClickable() && isPressed() && mSelectedPosition >= 0 && mAdapter != null && mSelectedPosition < mAdapter.getCount()) { final View view = getChildAt(mSelectedPosition - mFirstPosition); if (view != null) { performItemClick(view, mSelectedPosition, mSelectedRowId); view.setPressed(false); } setPressed(false); return true; } break; } return super.onKeyUp(keyCode, event); } @Override protected void dispatchSetPressed(boolean pressed) { // Don't dispatch setPressed to our children. We call setPressed on ourselves to // get the selector in the right state, but we don't want to press each child. } /** * Maps a point to a position in the list. * * @param x X in local coordinate * @param y Y in local coordinate * @return The position of the item which contains the specified point, or * {@link #INVALID_POSITION} if the point does not intersect an item. */ public int pointToPosition(int x, int y) { Rect frame = mTouchFrame; if (frame == null) { mTouchFrame = new Rect(); frame = mTouchFrame; } final int count = getChildCount(); for (int i = count - 1; i >= 0; i--) { final View child = getChildAt(i); if (child.getVisibility() == View.VISIBLE) { child.getHitRect(frame); if (frame.contains(x, y)) { return mFirstPosition + i; } } } return INVALID_POSITION; } /** * Maps a point to a the rowId of the item which intersects that point. * * @param x X in local coordinate * @param y Y in local coordinate * @return The rowId of the item which contains the specified point, or {@link #INVALID_ROW_ID} * if the point does not intersect an item. */ public long pointToRowId(int x, int y) { int position = pointToPosition(x, y); if (position >= 0) { return mAdapter.getItemId(position); } return INVALID_ROW_ID; } final class CheckForTap implements Runnable { public void run() { if (mTouchMode == TOUCH_MODE_DOWN) { mTouchMode = TOUCH_MODE_TAP; final View child = getChildAt(mMotionPosition - mFirstPosition); if (child != null && !child.hasFocusable()) { mLayoutMode = LAYOUT_NORMAL; if (!mDataChanged) { child.setPressed(true); setPressed(true); layoutChildren(); positionSelector(mMotionPosition, child); refreshDrawableState(); final int longPressTimeout = ViewConfiguration.getLongPressTimeout(); final boolean longClickable = isLongClickable(); if (mSelector != null) { Drawable d = mSelector.getCurrent(); if (d != null && d instanceof TransitionDrawable) { if (longClickable) { ((TransitionDrawable) d).startTransition(longPressTimeout); } else { ((TransitionDrawable) d).resetTransition(); } } } if (longClickable) { if (mPendingCheckForLongPress == null) { mPendingCheckForLongPress = new CheckForLongPress(); } mPendingCheckForLongPress.rememberWindowAttachCount(); postDelayed(mPendingCheckForLongPress, longPressTimeout); } else { mTouchMode = TOUCH_MODE_DONE_WAITING; } } else { mTouchMode = TOUCH_MODE_DONE_WAITING; } } } } } private boolean startScrollIfNeeded(int y) { // Check if we have moved far enough that it looks more like a // scroll than a tap final int deltaY = y - mMotionY; final int distance = Math.abs(deltaY); final boolean overscroll = getScrollY() != 0; if (overscroll || distance > mTouchSlop) { createScrollingCache(); if (overscroll) { mTouchMode = TOUCH_MODE_OVERSCROLL; mMotionCorrection = 0; } else { mTouchMode = TOUCH_MODE_SCROLL; mMotionCorrection = deltaY > 0 ? mTouchSlop : -mTouchSlop; } final Handler handler = getHandler(); // Handler should not be null unless the AbsListView is not attached to a // window, which would make it very hard to scroll it... but the monkeys // say it's possible. if (handler != null) { handler.removeCallbacks(mPendingCheckForLongPress); } setPressed(false); View motionView = getChildAt(mMotionPosition - mFirstPosition); if (motionView != null) { motionView.setPressed(false); } reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); // Time to start stealing events! Once we've stolen them, don't let anyone // steal from us final ViewParent parent = getParent(); if (parent != null) { parent.requestDisallowInterceptTouchEvent(true); } scrollIfNeeded(y); return true; } return false; } private void scrollIfNeeded(int y) { final int rawDeltaY = y - mMotionY; final int deltaY = rawDeltaY - mMotionCorrection; int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY; if (mTouchMode == TOUCH_MODE_SCROLL) { if (PROFILE_SCROLLING) { if (!mScrollProfilingStarted) { Debug.startMethodTracing("AbsListViewScroll"); mScrollProfilingStarted = true; } } // TODO removed strict span in backport (j. m.) //if (mScrollStrictSpan == null) { // // If it's non-null, we're already in a scroll. // mScrollStrictSpan = StrictMode.enterCriticalSpan("AbsListView-scroll"); //} if (y != mLastY) { // We may be here after stopping a fling and continuing to scroll. // If so, we haven't disallowed intercepting touch events yet. // Make sure that we do so in case we're in a parent that can intercept. if (!mDisallowIntercept && Math.abs(rawDeltaY) > mTouchSlop) { final ViewParent parent = getParent(); if (parent != null) { parent.requestDisallowInterceptTouchEvent(true); } } final int motionIndex; if (mMotionPosition >= 0) { motionIndex = mMotionPosition - mFirstPosition; } else { // If we don't have a motion position that we can reliably track, // pick something in the middle to make a best guess at things below. motionIndex = getChildCount() / 2; } int motionViewPrevTop = 0; View motionView = this.getChildAt(motionIndex); if (motionView != null) { motionViewPrevTop = motionView.getTop(); } // No need to do all this work if we're not going to move anyway boolean atEdge = false; if (incrementalDeltaY != 0) { atEdge = trackMotionScroll(deltaY, incrementalDeltaY); } // Check to see if we have bumped into the scroll limit motionView = this.getChildAt(motionIndex); if (motionView != null) { // Check if the top of the motion view is where it is // supposed to be final int motionViewRealTop = motionView.getTop(); if (atEdge) { // Apply overscroll final int scrollY = getScrollY(); int overscroll = -incrementalDeltaY - (motionViewRealTop - motionViewPrevTop); overScrollBy(0, overscroll, 0, scrollY, 0, 0, 0, mOverscrollDistance, true); if (Math.abs(mOverscrollDistance) == Math.abs(scrollY)) { // Don't allow overfling if we're at the edge. if (mVelocityTracker != null) { mVelocityTracker.clear(); } } final int overscrollMode = getOverScrollMode(); if (overscrollMode == OVER_SCROLL_ALWAYS || (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) { mDirection = 0; // Reset when entering overscroll. mTouchMode = TOUCH_MODE_OVERSCROLL; if (rawDeltaY > 0) { mEdgeGlowTop.onPull((float) overscroll / getHeight()); if (!mEdgeGlowBottom.isFinished()) { mEdgeGlowBottom.onRelease(); } } else if (rawDeltaY < 0) { mEdgeGlowBottom.onPull((float) overscroll / getHeight()); if (!mEdgeGlowTop.isFinished()) { mEdgeGlowTop.onRelease(); } } invalidate(); } } mMotionY = y; } mLastY = y; } } else if (mTouchMode == TOUCH_MODE_OVERSCROLL) { if (y != mLastY) { final int oldScroll = getScrollY(); final int newScroll = oldScroll - incrementalDeltaY; int newDirection = y > mLastY ? 1 : -1; if (mDirection == 0) { mDirection = newDirection; } int overScrollDistance = -incrementalDeltaY; if ((newScroll < 0 && oldScroll >= 0) || (newScroll > 0 && oldScroll <= 0)) { overScrollDistance = -oldScroll; incrementalDeltaY += overScrollDistance; } else { incrementalDeltaY = 0; } if (overScrollDistance != 0) { final int scrollY = getScrollY(); overScrollBy(0, overScrollDistance, 0, scrollY, 0, 0, 0, mOverscrollDistance, true); final int overscrollMode = getOverScrollMode(); if (overscrollMode == OVER_SCROLL_ALWAYS || (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) { if (rawDeltaY > 0) { mEdgeGlowTop.onPull((float) overScrollDistance / getHeight()); if (!mEdgeGlowBottom.isFinished()) { mEdgeGlowBottom.onRelease(); } } else if (rawDeltaY < 0) { mEdgeGlowBottom.onPull((float) overScrollDistance / getHeight()); if (!mEdgeGlowTop.isFinished()) { mEdgeGlowTop.onRelease(); } } invalidate(); } } if (incrementalDeltaY != 0) { // Coming back to 'real' list scrolling if (getScrollY() != 0) { scrollTo(getScrollX(), 0); invalidateParentIfNeededUnhide(); } trackMotionScroll(incrementalDeltaY, incrementalDeltaY); mTouchMode = TOUCH_MODE_SCROLL; // We did not scroll the full amount. Treat this essentially like the // start of a new touch scroll final int motionPosition = findClosestMotionRow(y); mMotionCorrection = 0; View motionView = getChildAt(motionPosition - mFirstPosition); mMotionViewOriginalTop = motionView != null ? motionView.getTop() : 0; mMotionY = y; mMotionPosition = motionPosition; } mLastY = y; mDirection = newDirection; } } } public void onTouchModeChanged(boolean isInTouchMode) { if (isInTouchMode) { // Get rid of the selection when we enter touch mode hideSelector(); // Layout, but only if we already have done so previously. // (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore // state.) if (getHeight() > 0 && getChildCount() > 0) { // We do not lose focus initiating a touch (since AbsListView is focusable in // touch mode). Force an initial layout to get rid of the selection. layoutChildren(); } updateSelectorState(); } else { int touchMode = mTouchMode; if (touchMode == TOUCH_MODE_OVERSCROLL || touchMode == TOUCH_MODE_OVERFLING) { if (mFlingRunnable != null) { mFlingRunnable.endFling(); } if (mPositionScroller != null) { mPositionScroller.stop(); } if (getScrollY() != 0) { scrollTo(getScrollX(), 0); invalidateParentCachesUnhide(); finishGlows(); invalidate(); } } } } @Override public boolean onTouchEvent(MotionEvent ev) { if (!isEnabled()) { // A disabled view that is clickable still consumes the touch // events, it just doesn't respond to them. return isClickable() || isLongClickable(); } if (mPositionScroller != null) { mPositionScroller.stop(); } if (!mIsAttached) { // Something isn't right. // Since we rely on being attached to get data set change notifications, // don't risk doing anything where we might try to resync and find things // in a bogus state. return false; } if (mFastScroller != null) { boolean intercepted = mFastScroller.onTouchEvent(ev); if (intercepted) { return true; } } final int action = ev.getAction(); View v; initVelocityTrackerIfNotExists(); mVelocityTracker.addMovement(ev); switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: { switch (mTouchMode) { case TOUCH_MODE_OVERFLING: { mFlingRunnable.endFling(); if (mPositionScroller != null) { mPositionScroller.stop(); } mTouchMode = TOUCH_MODE_OVERSCROLL; mMotionX = (int) ev.getX(); mMotionY = mLastY = (int) ev.getY(); mMotionCorrection = 0; mActivePointerId = ev.getPointerId(0); mDirection = 0; break; } default: { mActivePointerId = ev.getPointerId(0); final int x = (int) ev.getX(); final int y = (int) ev.getY(); int motionPosition = pointToPosition(x, y); if (!mDataChanged) { if ((mTouchMode != TOUCH_MODE_FLING) && (motionPosition >= 0) && (getAdapter().isEnabled(motionPosition))) { // User clicked on an actual view (and was not stopping a fling). // It might be a click or a scroll. Assume it is a click until // proven otherwise mTouchMode = TOUCH_MODE_DOWN; // FIXME Debounce if (mPendingCheckForTap == null) { mPendingCheckForTap = new CheckForTap(); } postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); } else { if (mTouchMode == TOUCH_MODE_FLING) { // Stopped a fling. It is a scroll. createScrollingCache(); mTouchMode = TOUCH_MODE_SCROLL; mMotionCorrection = 0; motionPosition = findMotionRow(y); mFlingRunnable.flywheelTouch(); } } } if (motionPosition >= 0) { // Remember where the motion event started v = getChildAt(motionPosition - mFirstPosition); mMotionViewOriginalTop = v.getTop(); } mMotionX = x; mMotionY = y; mMotionPosition = motionPosition; mLastY = Integer.MIN_VALUE; break; } } if (performButtonActionOnTouchDownUnhide(ev)) { if (mTouchMode == TOUCH_MODE_DOWN) { removeCallbacks(mPendingCheckForTap); } } break; } case MotionEvent.ACTION_MOVE: { int pointerIndex = ev.findPointerIndex(mActivePointerId); if (pointerIndex == -1) { pointerIndex = 0; mActivePointerId = ev.getPointerId(pointerIndex); } final int y = (int) ev.getY(pointerIndex); if (mDataChanged) { // Re-sync everything if data has been changed // since the scroll operation can query the adapter. layoutChildren(); } switch (mTouchMode) { case TOUCH_MODE_DOWN: case TOUCH_MODE_TAP: case TOUCH_MODE_DONE_WAITING: // Check if we have moved far enough that it looks more like a // scroll than a tap startScrollIfNeeded(y); break; case TOUCH_MODE_SCROLL: case TOUCH_MODE_OVERSCROLL: scrollIfNeeded(y); break; } break; } case MotionEvent.ACTION_UP: { switch (mTouchMode) { case TOUCH_MODE_DOWN: case TOUCH_MODE_TAP: case TOUCH_MODE_DONE_WAITING: final int motionPosition = mMotionPosition; final View child = getChildAt(motionPosition - mFirstPosition); final float x = ev.getX(); final boolean inList = x > mListPadding.left && x < getWidth() - mListPadding.right; if (child != null && !child.hasFocusable() && inList) { if (mTouchMode != TOUCH_MODE_DOWN) { child.setPressed(false); } if (mPerformClick == null) { mPerformClick = new PerformClick(); } final AbsListView.PerformClick performClick = mPerformClick; performClick.mClickMotionPosition = motionPosition; performClick.rememberWindowAttachCount(); mResurrectToPosition = motionPosition; if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) { final Handler handler = getHandler(); if (handler != null) { handler.removeCallbacks(mTouchMode == TOUCH_MODE_DOWN ? mPendingCheckForTap : mPendingCheckForLongPress); } mLayoutMode = LAYOUT_NORMAL; if (!mDataChanged && mAdapter.isEnabled(motionPosition)) { mTouchMode = TOUCH_MODE_TAP; setSelectedPositionInt(mMotionPosition); layoutChildren(); child.setPressed(true); positionSelector(mMotionPosition, child); setPressed(true); if (mSelector != null) { Drawable d = mSelector.getCurrent(); if (d != null && d instanceof TransitionDrawable) { ((TransitionDrawable) d).resetTransition(); } } if (mTouchModeReset != null) { removeCallbacks(mTouchModeReset); } mTouchModeReset = new Runnable() { @Override public void run() { mTouchModeReset = null; mTouchMode = TOUCH_MODE_REST; child.setPressed(false); setPressed(false); if (!mDataChanged) { performClick.run(); } } }; postDelayed(mTouchModeReset, ViewConfiguration.getPressedStateDuration()); } else { mTouchMode = TOUCH_MODE_REST; updateSelectorState(); } return true; } else if (!mDataChanged && mAdapter.isEnabled(motionPosition)) { performClick.run(); } } mTouchMode = TOUCH_MODE_REST; updateSelectorState(); break; case TOUCH_MODE_SCROLL: final int childCount = getChildCount(); if (childCount > 0) { final int firstChildTop = getChildAt(0).getTop(); final int lastChildBottom = getChildAt(childCount - 1).getBottom(); final int contentTop = mListPadding.top; final int contentBottom = getHeight() - mListPadding.bottom; if (mFirstPosition == 0 && firstChildTop >= contentTop && mFirstPosition + childCount < mItemCount && lastChildBottom <= getHeight() - contentBottom) { mTouchMode = TOUCH_MODE_REST; reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); } else { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); final int initialVelocity = (int) (velocityTracker.getYVelocity(mActivePointerId) * mVelocityScale); // Fling if we have enough velocity and we aren't at a boundary. // Since we can potentially overfling more than we can overscroll, don't // allow the weird behavior where you can scroll to a boundary then // fling further. if (Math.abs(initialVelocity) > mMinimumVelocity && !((mFirstPosition == 0 && firstChildTop == contentTop - mOverscrollDistance) || (mFirstPosition + childCount == mItemCount && lastChildBottom == contentBottom + mOverscrollDistance))) { if (mFlingRunnable == null) { mFlingRunnable = new FlingRunnable(); } reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); mFlingRunnable.start(-initialVelocity); } else { mTouchMode = TOUCH_MODE_REST; reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); if (mFlingRunnable != null) { mFlingRunnable.endFling(); } if (mPositionScroller != null) { mPositionScroller.stop(); } } } } else { mTouchMode = TOUCH_MODE_REST; reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); } break; case TOUCH_MODE_OVERSCROLL: if (mFlingRunnable == null) { mFlingRunnable = new FlingRunnable(); } final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); final int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); if (Math.abs(initialVelocity) > mMinimumVelocity) { mFlingRunnable.startOverfling(-initialVelocity); } else { mFlingRunnable.startSpringback(); } break; } setPressed(false); if (mEdgeGlowTop != null) { mEdgeGlowTop.onRelease(); mEdgeGlowBottom.onRelease(); } // Need to redraw since we probably aren't drawing the selector anymore invalidate(); final Handler handler = getHandler(); if (handler != null) { handler.removeCallbacks(mPendingCheckForLongPress); } recycleVelocityTracker(); mActivePointerId = INVALID_POINTER; if (PROFILE_SCROLLING) { if (mScrollProfilingStarted) { Debug.stopMethodTracing(); mScrollProfilingStarted = false; } } // FIXME not needed bacaues we could not implement strict span (j.m.) // if (mScrollStrictSpan != null) { // mScrollStrictSpan.finish(); // mScrollStrictSpan = null; // } break; } case MotionEvent.ACTION_CANCEL: { switch (mTouchMode) { case TOUCH_MODE_OVERSCROLL: if (mFlingRunnable == null) { mFlingRunnable = new FlingRunnable(); } mFlingRunnable.startSpringback(); break; case TOUCH_MODE_OVERFLING: // Do nothing - let it play out. break; default: mTouchMode = TOUCH_MODE_REST; setPressed(false); View motionView = this.getChildAt(mMotionPosition - mFirstPosition); if (motionView != null) { motionView.setPressed(false); } clearScrollingCache(); final Handler handler = getHandler(); if (handler != null) { handler.removeCallbacks(mPendingCheckForLongPress); } recycleVelocityTracker(); } if (mEdgeGlowTop != null) { mEdgeGlowTop.onRelease(); mEdgeGlowBottom.onRelease(); } mActivePointerId = INVALID_POINTER; break; } case MotionEvent.ACTION_POINTER_UP: { onSecondaryPointerUp(ev); final int x = mMotionX; final int y = mMotionY; final int motionPosition = pointToPosition(x, y); if (motionPosition >= 0) { // Remember where the motion event started v = getChildAt(motionPosition - mFirstPosition); mMotionViewOriginalTop = v.getTop(); mMotionPosition = motionPosition; } mLastY = y; break; } case MotionEvent.ACTION_POINTER_DOWN: { // New pointers take over dragging duties final int index = MotionEventCompat.getActionIndex(ev); final int id = ev.getPointerId(index); final int x = (int) ev.getX(index); final int y = (int) ev.getY(index); mMotionCorrection = 0; mActivePointerId = id; mMotionX = x; mMotionY = y; final int motionPosition = pointToPosition(x, y); if (motionPosition >= 0) { // Remember where the motion event started v = getChildAt(motionPosition - mFirstPosition); mMotionViewOriginalTop = v.getTop(); mMotionPosition = motionPosition; } mLastY = y; break; } } return true; } @Override protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) { final int scrollXOld = getScrollX(); final int scrollYOld = getScrollY(); if (scrollYOld != scrollY) { onScrollChanged(scrollXOld, scrollY, scrollXOld, scrollYOld); scrollTo(scrollXOld, scrollY); invalidateParentIfNeededUnhide(); awakenScrollBars(); } } @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1) @Override public boolean onGenericMotionEvent(MotionEvent event) { if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { switch (event.getAction()) { case MotionEvent.ACTION_SCROLL: { if (mTouchMode == TOUCH_MODE_REST) { final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); if (vscroll != 0) { final int delta = (int) (vscroll * getVerticalScrollFactorUnhide()); if (!trackMotionScroll(delta, delta)) { return true; } } } } } } return super.onGenericMotionEvent(event); } @Override public void draw(Canvas canvas) { super.draw(canvas); if (mEdgeGlowTop != null) { final int scrollY = getScrollY(); boolean needsInvalidate = false; if (!mEdgeGlowTop.isFinished()) { final int restoreCount = canvas.save(); final int leftPadding = mListPadding.left + mGlowPaddingLeft; final int rightPadding = mListPadding.right + mGlowPaddingRight; final int width = getWidth() - leftPadding - rightPadding; int edgeY = Math.min(0, scrollY + mFirstPositionDistanceGuess); canvas.translate(leftPadding, edgeY); mEdgeGlowTop.setSize(width, getHeight()); if (mEdgeGlowTop.draw(canvas)) { needsInvalidate = true; } canvas.restoreToCount(restoreCount); } if (!mEdgeGlowBottom.isFinished()) { final int restoreCount = canvas.save(); final int leftPadding = mListPadding.left + mGlowPaddingLeft; final int rightPadding = mListPadding.right + mGlowPaddingRight; final int width = getWidth() - leftPadding - rightPadding; final int height = getHeight(); int edgeX = -width + leftPadding; int edgeY = Math.max(height, scrollY + mLastPositionDistanceGuess); canvas.translate(edgeX, edgeY); canvas.rotate(180, width, 0); mEdgeGlowBottom.setSize(width, height); if (mEdgeGlowBottom.draw(canvas)) { needsInvalidate = true; } canvas.restoreToCount(restoreCount); } if (needsInvalidate) { invalidate(); } } if (mFastScroller != null) { final int scrollY = getScrollY(); if (scrollY != 0) { // Pin to the top/bottom during overscroll int restoreCount = canvas.save(); canvas.translate(0, (float) scrollY); mFastScroller.draw(canvas); canvas.restoreToCount(restoreCount); } else { mFastScroller.draw(canvas); } } } /** * @hide */ public void setOverScrollEffectPadding(int leftPadding, int rightPadding) { mGlowPaddingLeft = leftPadding; mGlowPaddingRight = rightPadding; } private void initOrResetVelocityTracker() { if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } else { mVelocityTracker.clear(); } } private void initVelocityTrackerIfNotExists() { if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } } private void recycleVelocityTracker() { if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } } @Override public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { if (disallowIntercept) { recycleVelocityTracker(); } super.requestDisallowInterceptTouchEvent(disallowIntercept); } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { int action = ev.getAction(); View v; if (mPositionScroller != null) { mPositionScroller.stop(); } if (!mIsAttached) { // Something isn't right. // Since we rely on being attached to get data set change notifications, // don't risk doing anything where we might try to resync and find things // in a bogus state. return false; } if (mFastScroller != null) { boolean intercepted = mFastScroller.onInterceptTouchEvent(ev); if (intercepted) { return true; } } switch (action & MotionEvent.ACTION_MASK) { case MotionEvent.ACTION_DOWN: { int touchMode = mTouchMode; if (touchMode == TOUCH_MODE_OVERFLING || touchMode == TOUCH_MODE_OVERSCROLL) { mMotionCorrection = 0; return true; } final int x = (int) ev.getX(); final int y = (int) ev.getY(); mActivePointerId = ev.getPointerId(0); int motionPosition = findMotionRow(y); if (touchMode != TOUCH_MODE_FLING && motionPosition >= 0) { // User clicked on an actual view (and was not stopping a fling). // Remember where the motion event started v = getChildAt(motionPosition - mFirstPosition); mMotionViewOriginalTop = v.getTop(); mMotionX = x; mMotionY = y; mMotionPosition = motionPosition; mTouchMode = TOUCH_MODE_DOWN; clearScrollingCache(); } mLastY = Integer.MIN_VALUE; initOrResetVelocityTracker(); mVelocityTracker.addMovement(ev); if (touchMode == TOUCH_MODE_FLING) { return true; } break; } case MotionEvent.ACTION_MOVE: { switch (mTouchMode) { case TOUCH_MODE_DOWN: int pointerIndex = ev.findPointerIndex(mActivePointerId); if (pointerIndex == -1) { pointerIndex = 0; mActivePointerId = ev.getPointerId(pointerIndex); } final int y = (int) ev.getY(pointerIndex); initVelocityTrackerIfNotExists(); mVelocityTracker.addMovement(ev); if (startScrollIfNeeded(y)) { return true; } break; } break; } case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: { mTouchMode = TOUCH_MODE_REST; mActivePointerId = INVALID_POINTER; recycleVelocityTracker(); reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); break; } case MotionEvent.ACTION_POINTER_UP: { onSecondaryPointerUp(ev); break; } } return false; } private void onSecondaryPointerUp(MotionEvent ev) { final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT; final int pointerId = ev.getPointerId(pointerIndex); if (pointerId == mActivePointerId) { // This was our active pointer going up. Choose a new // active pointer and adjust accordingly. // TODO: Make this decision more intelligent. final int newPointerIndex = pointerIndex == 0 ? 1 : 0; mMotionX = (int) ev.getX(newPointerIndex); mMotionY = (int) ev.getY(newPointerIndex); mMotionCorrection = 0; mActivePointerId = ev.getPointerId(newPointerIndex); } } /** * {@inheritDoc} */ @Override public void addTouchables(ArrayList<View> views) { final int count = getChildCount(); final int firstPosition = mFirstPosition; final ListAdapter adapter = mAdapter; if (adapter == null) { return; } for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (adapter.isEnabled(firstPosition + i)) { views.add(child); } child.addTouchables(views); } } /** * Fires an "on scroll state changed" event to the registered * {@link android.widget.AbsListView.OnScrollListener}, if any. The state change * is fired only if the specified state is different from the previously known state. * * @param newState The new scroll state. */ @Override void reportScrollStateChange(int newState) { if (newState != mLastScrollState) { if (mOnScrollListener != null) { mLastScrollState = newState; mOnScrollListener.onScrollStateChanged(this, newState); } } } /** * Responsible for fling behavior. Use {@link #start(int)} to * initiate a fling. Each frame of the fling is handled in {@link #run()}. * A FlingRunnable will keep re-posting itself until the fling is done. * */ private class FlingRunnable implements Runnable { /** * Tracks the decay of a fling scroll */ private final OverScroller mScroller; /** * Y value reported by mScroller on the previous fling */ private int mLastFlingY; // Unhide from Scroller (j.m.) public boolean isScrollingInDirectionCompat(OverScroller scroller, float xvel, float yvel) { final boolean finished = scroller.isFinished(); final int startX = scroller.getStartX(); final int finalY = scroller.getFinalY(); final int finalX = scroller.getFinalX(); final int startY = scroller.getStartY(); return !finished && Math.signum(xvel) == Math.signum(finalX - startX) && Math.signum(yvel) == Math.signum(finalY - startY); } private final Runnable mCheckFlywheel = new Runnable() { public void run() { final int activeId = mActivePointerId; final VelocityTracker vt = mVelocityTracker; final OverScroller scroller = mScroller; if (vt == null || activeId == INVALID_POINTER) { return; } vt.computeCurrentVelocity(1000, mMaximumVelocity); final float yvel = -vt.getYVelocity(activeId); if (Math.abs(yvel) >= mMinimumVelocity && isScrollingInDirectionCompat(scroller, 0, yvel)) { // Keep the fling alive a little longer postDelayed(this, FLYWHEEL_TIMEOUT); } else { endFling(); mTouchMode = TOUCH_MODE_SCROLL; reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL); } } }; private static final int FLYWHEEL_TIMEOUT = 40; // milliseconds FlingRunnable() { mScroller = new OverScroller(getContext()); } void start(int initialVelocity) { int initialY = initialVelocity < 0 ? Integer.MAX_VALUE : 0; mLastFlingY = initialY; // probably not needed there (j.m.) // mScroller.setInterpolator(null); mScroller.fling(0, initialY, 0, initialVelocity, 0, Integer.MAX_VALUE, 0, Integer.MAX_VALUE); mTouchMode = TOUCH_MODE_FLING; ViewCompat.postOnAnimation(AbsListView.this, this); if (PROFILE_FLINGING) { if (!mFlingProfilingStarted) { Debug.startMethodTracing("AbsListViewFling"); mFlingProfilingStarted = true; } } // FIXME we can not use strict span while backporting (j.m.) // if (mFlingStrictSpan == null) { // mFlingStrictSpan = StrictMode.enterCriticalSpan("AbsListView-fling"); // } } void startSpringback() { if (mScroller.springBack(0, getScrollY(), 0, 0, 0, 0)) { mTouchMode = TOUCH_MODE_OVERFLING; invalidate(); ViewCompat.postOnAnimation(AbsListView.this, this); } else { mTouchMode = TOUCH_MODE_REST; reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); } } void startOverfling(int initialVelocity) { // probably not needed there (j.m.) // mScroller.setInterpolator(null); mScroller.fling(0, getScrollY(), 0, initialVelocity, 0, 0, Integer.MIN_VALUE, Integer.MAX_VALUE, 0, getHeight()); mTouchMode = TOUCH_MODE_OVERFLING; invalidate(); ViewCompat.postOnAnimation(AbsListView.this, this); } void edgeReached(int delta) { mScroller.notifyVerticalEdgeReached(getScrollY(), 0, mOverflingDistance); final int overscrollMode = getOverScrollMode(); if (overscrollMode == OVER_SCROLL_ALWAYS || (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) { mTouchMode = TOUCH_MODE_OVERFLING; final int vel = (int) mScroller.getCurrVelocity(); if (delta > 0) { mEdgeGlowTop.onAbsorb(vel); } else { mEdgeGlowBottom.onAbsorb(vel); } } else { mTouchMode = TOUCH_MODE_REST; if (mPositionScroller != null) { mPositionScroller.stop(); } } invalidate(); ViewCompat.postOnAnimation(AbsListView.this, this); } void startScroll(int distance, int duration, boolean linear) { int initialY = distance < 0 ? Integer.MAX_VALUE : 0; mLastFlingY = initialY; // TODO probably not necessary (j.m.) // mScroller.setInterpolator(linear ? sLinearInterpolator : null); mScroller.startScroll(0, initialY, 0, distance, duration); mTouchMode = TOUCH_MODE_FLING; ViewCompat.postOnAnimation(AbsListView.this, this); } void endFling() { mTouchMode = TOUCH_MODE_REST; removeCallbacks(this); removeCallbacks(mCheckFlywheel); reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); clearScrollingCache(); mScroller.abortAnimation(); // FIXME We can not use strict span while backporting (j.m.) // if (mFlingStrictSpan != null) { // mFlingStrictSpan.finish(); // mFlingStrictSpan = null; // } } void flywheelTouch() { postDelayed(mCheckFlywheel, FLYWHEEL_TIMEOUT); } public void run() { switch (mTouchMode) { default: endFling(); return; case TOUCH_MODE_SCROLL: if (mScroller.isFinished()) { return; } // Fall through case TOUCH_MODE_FLING: { if (mDataChanged) { layoutChildren(); } if (mItemCount == 0 || getChildCount() == 0) { endFling(); return; } final OverScroller scroller = mScroller; boolean more = scroller.computeScrollOffset(); final int y = scroller.getCurrY(); // Flip sign to convert finger direction to list items direction // (e.g. finger moving down means list is moving towards the top) int delta = mLastFlingY - y; final int paddingBottom = getPaddingBottom(); final int paddingTop = getPaddingTop(); // Pretend that each frame of a fling scroll is a touch scroll if (delta > 0) { // List is moving towards the top. Use first view as mMotionPosition mMotionPosition = mFirstPosition; final View firstView = getChildAt(0); mMotionViewOriginalTop = firstView.getTop(); // Don't fling more than 1 screen delta = Math.min(getHeight() - paddingBottom - paddingTop - 1, delta); } else { // List is moving towards the bottom. Use last view as mMotionPosition int offsetToLast = getChildCount() - 1; mMotionPosition = mFirstPosition + offsetToLast; final View lastView = getChildAt(offsetToLast); mMotionViewOriginalTop = lastView.getTop(); // Don't fling more than 1 screen delta = Math.max(-(getHeight() - paddingBottom - paddingTop - 1), delta); } // Check to see if we have bumped into the scroll limit View motionView = getChildAt(mMotionPosition - mFirstPosition); int oldTop = 0; if (motionView != null) { oldTop = motionView.getTop(); } // Don't stop just because delta is zero (it could have been rounded) final boolean atEdge = trackMotionScroll(delta, delta); final boolean atEnd = atEdge && (delta != 0); if (atEnd) { if (motionView != null) { // Tweak the scroll for how far we overshot final int scrollY = getScrollY(); int overshoot = -(delta - (motionView.getTop() - oldTop)); overScrollBy(0, overshoot, 0, scrollY, 0, 0, 0, mOverflingDistance, false); } if (more) { edgeReached(delta); } break; } if (more && !atEnd) { if (atEdge) invalidate(); mLastFlingY = y; ViewCompat.postOnAnimation(AbsListView.this, this); } else { endFling(); if (PROFILE_FLINGING) { if (mFlingProfilingStarted) { Debug.stopMethodTracing(); mFlingProfilingStarted = false; } // TODO removed for backporting (j.m.) //if (mFlingStrictSpan != null) { // mFlingStrictSpan.finish(); // mFlingStrictSpan = null; //} } } break; } case TOUCH_MODE_OVERFLING: { final OverScroller scroller = mScroller; if (scroller.computeScrollOffset()) { final int scrollY = getScrollY(); final int currY = scroller.getCurrY(); final int deltaY = currY - scrollY; if (overScrollBy(0, deltaY, 0, scrollY, 0, 0, 0, mOverflingDistance, false)) { final boolean crossDown = scrollY <= 0 && currY > 0; final boolean crossUp = scrollY >= 0 && currY < 0; if (crossDown || crossUp) { int velocity = (int) scroller.getCurrVelocity(); if (crossUp) velocity = -velocity; // Don't flywheel from this; we're just continuing things. scroller.abortAnimation(); start(velocity); } else { startSpringback(); } } else { invalidate(); ViewCompat.postOnAnimation(AbsListView.this, this); } } else { endFling(); } break; } } } } class PositionScroller implements Runnable { private static final int SCROLL_DURATION = 200; private static final int MOVE_DOWN_POS = 1; private static final int MOVE_UP_POS = 2; private static final int MOVE_DOWN_BOUND = 3; private static final int MOVE_UP_BOUND = 4; private static final int MOVE_OFFSET = 5; private int mMode; private int mTargetPos; private int mBoundPos; private int mLastSeenPos; private int mScrollDuration; private final int mExtraScroll; private int mOffsetFromTop; PositionScroller() { final Context context = getContext(); mExtraScroll = ViewConfiguration.get(context).getScaledFadingEdgeLength(); } void start(final int position) { stop(); if (mDataChanged) { // Wait until we're back in a stable state to try this. mPositionScrollAfterLayout = new Runnable() { @Override public void run() { start(position); } }; return; } final int childCount = getChildCount(); if (childCount == 0) { // Can't scroll without children. return; } final int firstPos = mFirstPosition; final int lastPos = firstPos + childCount - 1; int viewTravelCount; int clampedPosition = Math.max(0, Math.min(getCount() - 1, position)); if (clampedPosition < firstPos) { viewTravelCount = firstPos - clampedPosition + 1; mMode = MOVE_UP_POS; } else if (clampedPosition > lastPos) { viewTravelCount = clampedPosition - lastPos + 1; mMode = MOVE_DOWN_POS; } else { scrollToVisible(clampedPosition, INVALID_POSITION, SCROLL_DURATION); return; } if (viewTravelCount > 0) { mScrollDuration = SCROLL_DURATION / viewTravelCount; } else { mScrollDuration = SCROLL_DURATION; } mTargetPos = clampedPosition; mBoundPos = INVALID_POSITION; mLastSeenPos = INVALID_POSITION; ViewCompat.postOnAnimation(AbsListView.this, this); } void start(final int position, final int boundPosition) { stop(); if (boundPosition == INVALID_POSITION) { start(position); return; } if (mDataChanged) { // Wait until we're back in a stable state to try this. mPositionScrollAfterLayout = new Runnable() { @Override public void run() { start(position, boundPosition); } }; return; } final int childCount = getChildCount(); if (childCount == 0) { // Can't scroll without children. return; } final int firstPos = mFirstPosition; final int lastPos = firstPos + childCount - 1; int viewTravelCount; int clampedPosition = Math.max(0, Math.min(getCount() - 1, position)); if (clampedPosition < firstPos) { final int boundPosFromLast = lastPos - boundPosition; if (boundPosFromLast < 1) { // Moving would shift our bound position off the screen. Abort. return; } final int posTravel = firstPos - clampedPosition + 1; final int boundTravel = boundPosFromLast - 1; if (boundTravel < posTravel) { viewTravelCount = boundTravel; mMode = MOVE_UP_BOUND; } else { viewTravelCount = posTravel; mMode = MOVE_UP_POS; } } else if (clampedPosition > lastPos) { final int boundPosFromFirst = boundPosition - firstPos; if (boundPosFromFirst < 1) { // Moving would shift our bound position off the screen. Abort. return; } final int posTravel = clampedPosition - lastPos + 1; final int boundTravel = boundPosFromFirst - 1; if (boundTravel < posTravel) { viewTravelCount = boundTravel; mMode = MOVE_DOWN_BOUND; } else { viewTravelCount = posTravel; mMode = MOVE_DOWN_POS; } } else { scrollToVisible(clampedPosition, boundPosition, SCROLL_DURATION); return; } if (viewTravelCount > 0) { mScrollDuration = SCROLL_DURATION / viewTravelCount; } else { mScrollDuration = SCROLL_DURATION; } mTargetPos = clampedPosition; mBoundPos = boundPosition; mLastSeenPos = INVALID_POSITION; ViewCompat.postOnAnimation(AbsListView.this, this); } void startWithOffset(int position, int offset) { startWithOffset(position, offset, SCROLL_DURATION); } void startWithOffset(final int position, int offset, final int duration) { stop(); if (mDataChanged) { // Wait until we're back in a stable state to try this. final int postOffset = offset; mPositionScrollAfterLayout = new Runnable() { @Override public void run() { startWithOffset(position, postOffset, duration); } }; return; } final int childCount = getChildCount(); if (childCount == 0) { // Can't scroll without children. return; } offset += getPaddingTop(); mTargetPos = Math.max(0, Math.min(getCount() - 1, position)); mOffsetFromTop = offset; mBoundPos = INVALID_POSITION; mLastSeenPos = INVALID_POSITION; mMode = MOVE_OFFSET; final int firstPos = mFirstPosition; final int lastPos = firstPos + childCount - 1; int viewTravelCount; if (mTargetPos < firstPos) { viewTravelCount = firstPos - mTargetPos; } else if (mTargetPos > lastPos) { viewTravelCount = mTargetPos - lastPos; } else { // On-screen, just scroll. final int targetTop = getChildAt(mTargetPos - firstPos).getTop(); smoothScrollBy(targetTop - offset, duration, true); return; } // Estimate how many screens we should travel final float screenTravelCount = (float) viewTravelCount / childCount; mScrollDuration = screenTravelCount < 1 ? duration : (int) (duration / screenTravelCount); mLastSeenPos = INVALID_POSITION; ViewCompat.postOnAnimation(AbsListView.this, this); } /** * Scroll such that targetPos is in the visible padded region without scrolling * boundPos out of view. Assumes targetPos is onscreen. */ void scrollToVisible(int targetPos, int boundPos, int duration) { final int firstPos = mFirstPosition; final int childCount = getChildCount(); final int lastPos = firstPos + childCount - 1; final int paddedTop = mListPadding.top; final int paddedBottom = getHeight() - mListPadding.bottom; if (targetPos < firstPos || targetPos > lastPos) { Log.w(TAG, "scrollToVisible called with targetPos " + targetPos + " not visible [" + firstPos + ", " + lastPos + "]"); } if (boundPos < firstPos || boundPos > lastPos) { // boundPos doesn't matter, it's already offscreen. boundPos = INVALID_POSITION; } final View targetChild = getChildAt(targetPos - firstPos); final int targetTop = targetChild.getTop(); final int targetBottom = targetChild.getBottom(); int scrollBy = 0; if (targetBottom > paddedBottom) { scrollBy = targetBottom - paddedBottom; } if (targetTop < paddedTop) { scrollBy = targetTop - paddedTop; } if (scrollBy == 0) { return; } if (boundPos >= 0) { final View boundChild = getChildAt(boundPos - firstPos); final int boundTop = boundChild.getTop(); final int boundBottom = boundChild.getBottom(); final int absScroll = Math.abs(scrollBy); if (scrollBy < 0 && boundBottom + absScroll > paddedBottom) { // Don't scroll the bound view off the bottom of the screen. scrollBy = Math.max(0, boundBottom - paddedBottom); } else if (scrollBy > 0 && boundTop - absScroll < paddedTop) { // Don't scroll the bound view off the top of the screen. scrollBy = Math.min(0, boundTop - paddedTop); } } smoothScrollBy(scrollBy, duration); } void stop() { removeCallbacks(this); } public void run() { final int listHeight = getHeight(); final int firstPos = mFirstPosition; switch (mMode) { case MOVE_DOWN_POS: { final int lastViewIndex = getChildCount() - 1; final int lastPos = firstPos + lastViewIndex; if (lastViewIndex < 0) { return; } if (lastPos == mLastSeenPos) { // No new views, let things keep going. ViewCompat.postOnAnimation(AbsListView.this, this); return; } final View lastView = getChildAt(lastViewIndex); final int lastViewHeight = lastView.getHeight(); final int lastViewTop = lastView.getTop(); final int lastViewPixelsShowing = listHeight - lastViewTop; final int extraScroll = lastPos < mItemCount - 1 ? Math.max(mListPadding.bottom, mExtraScroll) : mListPadding.bottom; final int scrollBy = lastViewHeight - lastViewPixelsShowing + extraScroll; smoothScrollBy(scrollBy, mScrollDuration, true); mLastSeenPos = lastPos; if (lastPos < mTargetPos) { ViewCompat.postOnAnimation(AbsListView.this, this); } break; } case MOVE_DOWN_BOUND: { final int nextViewIndex = 1; final int childCount = getChildCount(); if (firstPos == mBoundPos || childCount <= nextViewIndex || firstPos + childCount >= mItemCount) { return; } final int nextPos = firstPos + nextViewIndex; if (nextPos == mLastSeenPos) { // No new views, let things keep going. ViewCompat.postOnAnimation(AbsListView.this, this); return; } final View nextView = getChildAt(nextViewIndex); final int nextViewHeight = nextView.getHeight(); final int nextViewTop = nextView.getTop(); final int extraScroll = Math.max(mListPadding.bottom, mExtraScroll); if (nextPos < mBoundPos) { smoothScrollBy(Math.max(0, nextViewHeight + nextViewTop - extraScroll), mScrollDuration, true); mLastSeenPos = nextPos; ViewCompat.postOnAnimation(AbsListView.this, this); } else { if (nextViewTop > extraScroll) { smoothScrollBy(nextViewTop - extraScroll, mScrollDuration, true); } } break; } case MOVE_UP_POS: { if (firstPos == mLastSeenPos) { // No new views, let things keep going. ViewCompat.postOnAnimation(AbsListView.this, this); return; } final View firstView = getChildAt(0); if (firstView == null) { return; } final int firstViewTop = firstView.getTop(); final int extraScroll = firstPos > 0 ? Math.max(mExtraScroll, mListPadding.top) : mListPadding.top; smoothScrollBy(firstViewTop - extraScroll, mScrollDuration, true); mLastSeenPos = firstPos; if (firstPos > mTargetPos) { ViewCompat.postOnAnimation(AbsListView.this, this); } break; } case MOVE_UP_BOUND: { final int lastViewIndex = getChildCount() - 2; if (lastViewIndex < 0) { return; } final int lastPos = firstPos + lastViewIndex; if (lastPos == mLastSeenPos) { // No new views, let things keep going. ViewCompat.postOnAnimation(AbsListView.this, this); return; } final View lastView = getChildAt(lastViewIndex); final int lastViewHeight = lastView.getHeight(); final int lastViewTop = lastView.getTop(); final int lastViewPixelsShowing = listHeight - lastViewTop; final int extraScroll = Math.max(mListPadding.top, mExtraScroll); mLastSeenPos = lastPos; if (lastPos > mBoundPos) { smoothScrollBy(-(lastViewPixelsShowing - extraScroll), mScrollDuration, true); ViewCompat.postOnAnimation(AbsListView.this, this); } else { final int bottom = listHeight - extraScroll; final int lastViewBottom = lastViewTop + lastViewHeight; if (bottom > lastViewBottom) { smoothScrollBy(-(bottom - lastViewBottom), mScrollDuration, true); } } break; } case MOVE_OFFSET: { if (mLastSeenPos == firstPos) { // No new views, let things keep going. ViewCompat.postOnAnimation(AbsListView.this, this); return; } mLastSeenPos = firstPos; final int childCount = getChildCount(); final int position = mTargetPos; final int lastPos = firstPos + childCount - 1; int viewTravelCount = 0; if (position < firstPos) { viewTravelCount = firstPos - position + 1; } else if (position > lastPos) { viewTravelCount = position - lastPos; } // Estimate how many screens we should travel final float screenTravelCount = (float) viewTravelCount / childCount; final float modifier = Math.min(Math.abs(screenTravelCount), 1.f); if (position < firstPos) { final int distance = (int) (-getHeight() * modifier); final int duration = (int) (mScrollDuration * modifier); smoothScrollBy(distance, duration, true); ViewCompat.postOnAnimation(AbsListView.this, this); } else if (position > lastPos) { final int distance = (int) (getHeight() * modifier); final int duration = (int) (mScrollDuration * modifier); smoothScrollBy(distance, duration, true); ViewCompat.postOnAnimation(AbsListView.this, this); } else { // On-screen, just scroll. final int targetTop = getChildAt(position - firstPos).getTop(); final int distance = targetTop - mOffsetFromTop; final int duration = (int) (mScrollDuration * ((float) Math.abs(distance) / getHeight())); smoothScrollBy(distance, duration, true); } break; } default: break; } } } /** * The amount of friction applied to flings. The default value * is {@link ViewConfiguration#getScrollFriction}. * * @return A scalar dimensionless value representing the coefficient of * friction. */ public void setFriction(float friction) { if (mFlingRunnable == null) { mFlingRunnable = new FlingRunnable(); } mFlingRunnable.mScroller.setFriction(friction); } /** * Sets a scale factor for the fling velocity. The initial scale * factor is 1.0. * * @param scale The scale factor to multiply the velocity by. */ public void setVelocityScale(float scale) { mVelocityScale = scale; } /** * Smoothly scroll to the specified adapter position. The view will * scroll such that the indicated position is displayed. * @param position Scroll to this adapter position. */ public void smoothScrollToPosition(int position) { if (mPositionScroller == null) { mPositionScroller = new PositionScroller(); } mPositionScroller.start(position); } /** * Smoothly scroll to the specified adapter position. The view will scroll * such that the indicated position is displayed <code>offset</code> pixels from * the top edge of the view. If this is impossible, (e.g. the offset would scroll * the first or last item beyond the boundaries of the list) it will get as close * as possible. The scroll will take <code>duration</code> milliseconds to complete. * * @param position Position to scroll to * @param offset Desired distance in pixels of <code>position</code> from the top * of the view when scrolling is finished * @param duration Number of milliseconds to use for the scroll */ public void smoothScrollToPositionFromTop(int position, int offset, int duration) { if (mPositionScroller == null) { mPositionScroller = new PositionScroller(); } mPositionScroller.startWithOffset(position, offset, duration); } /** * Smoothly scroll to the specified adapter position. The view will scroll * such that the indicated position is displayed <code>offset</code> pixels from * the top edge of the view. If this is impossible, (e.g. the offset would scroll * the first or last item beyond the boundaries of the list) it will get as close * as possible. * * @param position Position to scroll to * @param offset Desired distance in pixels of <code>position</code> from the top * of the view when scrolling is finished */ public void smoothScrollToPositionFromTop(int position, int offset) { if (mPositionScroller == null) { mPositionScroller = new PositionScroller(); } mPositionScroller.startWithOffset(position, offset); } /** * Smoothly scroll to the specified adapter position. The view will * scroll such that the indicated position is displayed, but it will * stop early if scrolling further would scroll boundPosition out of * view. * @param position Scroll to this adapter position. * @param boundPosition Do not scroll if it would move this adapter * position out of view. */ public void smoothScrollToPosition(int position, int boundPosition) { if (mPositionScroller == null) { mPositionScroller = new PositionScroller(); } mPositionScroller.start(position, boundPosition); } /** * Smoothly scroll by distance pixels over duration milliseconds. * @param distance Distance to scroll in pixels. * @param duration Duration of the scroll animation in milliseconds. */ public void smoothScrollBy(int distance, int duration) { smoothScrollBy(distance, duration, false); } void smoothScrollBy(int distance, int duration, boolean linear) { if (mFlingRunnable == null) { mFlingRunnable = new FlingRunnable(); } // No sense starting to scroll if we're not going anywhere final int firstPos = mFirstPosition; final int childCount = getChildCount(); final int lastPos = firstPos + childCount; final int topLimit = getPaddingTop(); final int bottomLimit = getHeight() - getPaddingBottom(); if (distance == 0 || mItemCount == 0 || childCount == 0 || (firstPos == 0 && getChildAt(0).getTop() == topLimit && distance < 0) || (lastPos == mItemCount && getChildAt(childCount - 1).getBottom() == bottomLimit && distance > 0)) { mFlingRunnable.endFling(); if (mPositionScroller != null) { mPositionScroller.stop(); } } else { reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING); mFlingRunnable.startScroll(distance, duration, linear); } } /** * Allows RemoteViews to scroll relatively to a position. */ void smoothScrollByOffset(int position) { int index = -1; if (position < 0) { index = getFirstVisiblePosition(); } else if (position > 0) { index = getLastVisiblePosition(); } if (index > -1) { View child = getChildAt(index - getFirstVisiblePosition()); if (child != null) { Rect visibleRect = new Rect(); if (child.getGlobalVisibleRect(visibleRect)) { // the child is partially visible int childRectArea = child.getWidth() * child.getHeight(); int visibleRectArea = visibleRect.width() * visibleRect.height(); float visibleArea = (visibleRectArea / (float) childRectArea); final float visibleThreshold = 0.75f; if ((position < 0) && (visibleArea < visibleThreshold)) { // the top index is not perceivably visible so offset // to account for showing that top index as well ++index; } else if ((position > 0) && (visibleArea < visibleThreshold)) { // the bottom index is not perceivably visible so offset // to account for showing that bottom index as well --index; } } smoothScrollToPosition(Math.max(0, Math.min(getCount(), index + position))); } } } private void createScrollingCache() { if (mScrollingCacheEnabled && !mCachingStarted && !isHardwareAcceleratedCompat()) { setChildrenDrawnWithCacheEnabled(true); setChildrenDrawingCacheEnabled(true); mCachingStarted = mCachingActive = true; } } private void clearScrollingCache() { if (!isHardwareAcceleratedCompat()) { if (mClearScrollingCache == null) { mClearScrollingCache = new Runnable() { public void run() { if (mCachingStarted) { mCachingStarted = mCachingActive = false; setChildrenDrawnWithCacheEnabled(false); if ((getPersistentDrawingCache() & PERSISTENT_SCROLLING_CACHE) == 0) { setChildrenDrawingCacheEnabled(false); } if (!isAlwaysDrawnWithCacheEnabled()) { invalidate(); } } } }; } post(mClearScrollingCache); } } /** * Track a motion scroll * * @param deltaY Amount to offset mMotionView. This is the accumulated delta since the motion * began. Positive numbers mean the user's finger is moving down the screen. * @param incrementalDeltaY Change in deltaY from the previous event. * @return true if we're already at the beginning/end of the list and have nothing to do. */ boolean trackMotionScroll(int deltaY, int incrementalDeltaY) { final int childCount = getChildCount(); if (childCount == 0) { return true; } final int firstTop = getChildAt(0).getTop(); final int lastBottom = getChildAt(childCount - 1).getBottom(); final Rect listPadding = mListPadding; // "effective padding" In this case is the amount of padding that affects // how much space should not be filled by items. If we don't clip to padding // there is no effective padding. int effectivePaddingTop = 0; int effectivePaddingBottom = 0; if (mClipToPadding) { effectivePaddingTop = listPadding.top; effectivePaddingBottom = listPadding.bottom; } // FIXME account for grid vertical spacing too? final int spaceAbove = effectivePaddingTop - firstTop; final int end = getHeight() - effectivePaddingBottom; final int spaceBelow = lastBottom - end; final int height = getHeight() - getPaddingBottom() - getPaddingTop(); if (deltaY < 0) { deltaY = Math.max(-(height - 1), deltaY); } else { deltaY = Math.min(height - 1, deltaY); } if (incrementalDeltaY < 0) { incrementalDeltaY = Math.max(-(height - 1), incrementalDeltaY); } else { incrementalDeltaY = Math.min(height - 1, incrementalDeltaY); } final int firstPosition = mFirstPosition; // Update our guesses for where the first and last views are if (firstPosition == 0) { mFirstPositionDistanceGuess = firstTop - listPadding.top; } else { mFirstPositionDistanceGuess += incrementalDeltaY; } if (firstPosition + childCount == mItemCount) { mLastPositionDistanceGuess = lastBottom + listPadding.bottom; } else { mLastPositionDistanceGuess += incrementalDeltaY; } final boolean cannotScrollDown = (firstPosition == 0 && firstTop >= listPadding.top && incrementalDeltaY >= 0); final boolean cannotScrollUp = (firstPosition + childCount == mItemCount && lastBottom <= getHeight() - listPadding.bottom && incrementalDeltaY <= 0); if (cannotScrollDown || cannotScrollUp) { return incrementalDeltaY != 0; } final boolean down = incrementalDeltaY < 0; final boolean inTouchMode = isInTouchMode(); if (inTouchMode) { hideSelector(); } final int headerViewsCount = getHeaderViewsCount(); final int footerViewsStart = mItemCount - getFooterViewsCount(); int start = 0; int count = 0; if (down) { int top = -incrementalDeltaY; if (mClipToPadding) { top += listPadding.top; } for (int i = 0; i < childCount; i++) { final View child = getChildAt(i); if (child.getBottom() >= top) { break; } else { count++; int position = firstPosition + i; if (position >= headerViewsCount && position < footerViewsStart) { mRecycler.addScrapView(child, position); } } } } else { int bottom = getHeight() - incrementalDeltaY; if (mClipToPadding) { bottom -= listPadding.bottom; } for (int i = childCount - 1; i >= 0; i--) { final View child = getChildAt(i); if (child.getTop() <= bottom) { break; } else { start = i; count++; int position = firstPosition + i; if (position >= headerViewsCount && position < footerViewsStart) { mRecycler.addScrapView(child, position); } } } } mMotionViewNewTop = mMotionViewOriginalTop + deltaY; mBlockLayoutRequests = true; if (count > 0) { detachViewsFromParent(start, count); mRecycler.removeSkippedScrap(); } // invalidate before moving the children to avoid unnecessary invalidate // calls to bubble up from the children all the way to the top if (!awakenScrollBars()) { invalidate(); } offsetChildrenTopAndBottomUnhide(incrementalDeltaY); if (down) { mFirstPosition += count; } final int absIncrementalDeltaY = Math.abs(incrementalDeltaY); if (spaceAbove < absIncrementalDeltaY || spaceBelow < absIncrementalDeltaY) { fillGap(down); } if (!inTouchMode && mSelectedPosition != INVALID_POSITION) { final int childIndex = mSelectedPosition - mFirstPosition; if (childIndex >= 0 && childIndex < getChildCount()) { positionSelector(mSelectedPosition, getChildAt(childIndex)); } } else if (mSelectorPosition != INVALID_POSITION) { final int childIndex = mSelectorPosition - mFirstPosition; if (childIndex >= 0 && childIndex < getChildCount()) { positionSelector(INVALID_POSITION, getChildAt(childIndex)); } } else { mSelectorRect.setEmpty(); } mBlockLayoutRequests = false; invokeOnItemScrollListener(); return false; } /** * Returns the number of header views in the list. Header views are special views * at the top of the list that should not be recycled during a layout. * * @return The number of header views, 0 in the default implementation. */ int getHeaderViewsCount() { return 0; } /** * Returns the number of footer views in the list. Footer views are special views * at the bottom of the list that should not be recycled during a layout. * * @return The number of footer views, 0 in the default implementation. */ int getFooterViewsCount() { return 0; } /** * Fills the gap left open by a touch-scroll. During a touch scroll, children that * remain on screen are shifted and the other ones are discarded. The role of this * method is to fill the gap thus created by performing a partial layout in the * empty space. * * @param down true if the scroll is going down, false if it is going up */ abstract void fillGap(boolean down); void hideSelector() { if (mSelectedPosition != INVALID_POSITION) { if (mLayoutMode != LAYOUT_SPECIFIC) { mResurrectToPosition = mSelectedPosition; } if (mNextSelectedPosition >= 0 && mNextSelectedPosition != mSelectedPosition) { mResurrectToPosition = mNextSelectedPosition; } setSelectedPositionInt(INVALID_POSITION); setNextSelectedPositionInt(INVALID_POSITION); mSelectedTop = 0; } } /** * @return A position to select. First we try mSelectedPosition. If that has been clobbered by * entering touch mode, we then try mResurrectToPosition. Values are pinned to the range * of items available in the adapter */ int reconcileSelectedPosition() { int position = mSelectedPosition; if (position < 0) { position = mResurrectToPosition; } position = Math.max(0, position); position = Math.min(position, mItemCount - 1); return position; } /** * Find the row closest to y. This row will be used as the motion row when scrolling * * @param y Where the user touched * @return The position of the first (or only) item in the row containing y */ abstract int findMotionRow(int y); /** * Find the row closest to y. This row will be used as the motion row when scrolling. * * @param y Where the user touched * @return The position of the first (or only) item in the row closest to y */ int findClosestMotionRow(int y) { final int childCount = getChildCount(); if (childCount == 0) { return INVALID_POSITION; } final int motionRow = findMotionRow(y); return motionRow != INVALID_POSITION ? motionRow : mFirstPosition + childCount - 1; } /** * Causes all the views to be rebuilt and redrawn. */ public void invalidateViews() { mDataChanged = true; rememberSyncState(); requestLayout(); invalidate(); } /** * If there is a selection returns false. * Otherwise resurrects the selection and returns true if resurrected. */ boolean resurrectSelectionIfNeeded() { if (mSelectedPosition < 0 && resurrectSelection()) { updateSelectorState(); return true; } return false; } /** * Makes the item at the supplied position selected. * * @param position the position of the new selection */ abstract void setSelectionInt(int position); /** * Attempt to bring the selection back if the user is switching from touch * to trackball mode * @return Whether selection was set to something. */ boolean resurrectSelection() { final int childCount = getChildCount(); if (childCount <= 0) { return false; } int selectedTop = 0; int selectedPos; int childrenTop = mListPadding.top; int childrenBottom = getBottom() - getTop() - mListPadding.bottom; final int firstPosition = mFirstPosition; final int toPosition = mResurrectToPosition; boolean down = true; if (toPosition >= firstPosition && toPosition < firstPosition + childCount) { selectedPos = toPosition; final View selected = getChildAt(selectedPos - mFirstPosition); selectedTop = selected.getTop(); int selectedBottom = selected.getBottom(); // We are scrolled, don't get in the fade if (selectedTop < childrenTop) { selectedTop = childrenTop + getVerticalFadingEdgeLength(); } else if (selectedBottom > childrenBottom) { selectedTop = childrenBottom - selected.getMeasuredHeight() - getVerticalFadingEdgeLength(); } } else { if (toPosition < firstPosition) { // Default to selecting whatever is first selectedPos = firstPosition; for (int i = 0; i < childCount; i++) { final View v = getChildAt(i); final int top = v.getTop(); if (i == 0) { // Remember the position of the first item selectedTop = top; // See if we are scrolled at all if (firstPosition > 0 || top < childrenTop) { // If we are scrolled, don't select anything that is // in the fade region childrenTop += getVerticalFadingEdgeLength(); } } if (top >= childrenTop) { // Found a view whose top is fully visisble selectedPos = firstPosition + i; selectedTop = top; break; } } } else { final int itemCount = mItemCount; down = false; selectedPos = firstPosition + childCount - 1; for (int i = childCount - 1; i >= 0; i--) { final View v = getChildAt(i); final int top = v.getTop(); final int bottom = v.getBottom(); if (i == childCount - 1) { selectedTop = top; if (firstPosition + childCount < itemCount || bottom > childrenBottom) { childrenBottom -= getVerticalFadingEdgeLength(); } } if (bottom <= childrenBottom) { selectedPos = firstPosition + i; selectedTop = top; break; } } } } mResurrectToPosition = INVALID_POSITION; removeCallbacks(mFlingRunnable); if (mPositionScroller != null) { mPositionScroller.stop(); } mTouchMode = TOUCH_MODE_REST; clearScrollingCache(); mSpecificTop = selectedTop; selectedPos = lookForSelectablePosition(selectedPos, down); if (selectedPos >= firstPosition && selectedPos <= getLastVisiblePosition()) { mLayoutMode = LAYOUT_SPECIFIC; updateSelectorState(); setSelectionInt(selectedPos); invokeOnItemScrollListener(); } else { selectedPos = INVALID_POSITION; } reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE); return selectedPos >= 0; } void confirmCheckedPositionsById() { // Clear out the positional check states, we'll rebuild it below from IDs. mCheckStates.clear(); boolean checkedCountChanged = false; for (int checkedIndex = 0; checkedIndex < mCheckedIdStates.size(); checkedIndex++) { final long id = mCheckedIdStates.keyAt(checkedIndex); final int lastPos = mCheckedIdStates.valueAt(checkedIndex); final long lastPosId = mAdapter.getItemId(lastPos); if (id != lastPosId) { // Look around to see if the ID is nearby. If not, uncheck it. final int start = Math.max(0, lastPos - CHECK_POSITION_SEARCH_DISTANCE); final int end = Math.min(lastPos + CHECK_POSITION_SEARCH_DISTANCE, mItemCount); boolean found = false; for (int searchPos = start; searchPos < end; searchPos++) { final long searchId = mAdapter.getItemId(searchPos); if (id == searchId) { found = true; mCheckStates.put(searchPos, true); mCheckedIdStates.setValueAt(checkedIndex, searchPos); break; } } if (!found) { mCheckedIdStates.delete(id); checkedIndex--; mCheckedItemCount--; checkedCountChanged = true; if (mChoiceActionMode != null && mMultiChoiceModeCallback != null) { mMultiChoiceModeCallback.onItemCheckedStateChanged(mChoiceActionMode, lastPos, id, false); } } } else { mCheckStates.put(lastPos, true); } } if (checkedCountChanged && mChoiceActionMode != null) { mChoiceActionMode.invalidate(); } } @Override protected void handleDataChanged() { int count = mItemCount; int lastHandledItemCount = mLastHandledItemCount; mLastHandledItemCount = mItemCount; if (mChoiceMode != CHOICE_MODE_NONE && mAdapter != null && mAdapter.hasStableIds()) { confirmCheckedPositionsById(); } // TODO: In the future we can recycle these views based on stable ID instead. mRecycler.clearTransientStateViews(); if (count > 0) { int newPos; int selectablePos; // Find the row we are supposed to sync to if (mNeedSync) { // Update this first, since setNextSelectedPositionInt inspects it mNeedSync = false; mPendingSync = null; if (mTranscriptMode == TRANSCRIPT_MODE_ALWAYS_SCROLL) { mLayoutMode = LAYOUT_FORCE_BOTTOM; return; } else if (mTranscriptMode == TRANSCRIPT_MODE_NORMAL) { if (mForceTranscriptScroll) { mForceTranscriptScroll = false; mLayoutMode = LAYOUT_FORCE_BOTTOM; return; } final int childCount = getChildCount(); final int listBottom = getHeight() - getPaddingBottom(); final View lastChild = getChildAt(childCount - 1); final int lastBottom = lastChild != null ? lastChild.getBottom() : listBottom; if (mFirstPosition + childCount >= lastHandledItemCount && lastBottom <= listBottom) { mLayoutMode = LAYOUT_FORCE_BOTTOM; return; } // Something new came in and we didn't scroll; give the user a clue that // there's something new. awakenScrollBars(); } switch (mSyncMode) { case SYNC_SELECTED_POSITION: if (isInTouchMode()) { // We saved our state when not in touch mode. (We know this because // mSyncMode is SYNC_SELECTED_POSITION.) Now we are trying to // restore in touch mode. Just leave mSyncPosition as it is (possibly // adjusting if the available range changed) and return. mLayoutMode = LAYOUT_SYNC; mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1); return; } else { // See if we can find a position in the new data with the same // id as the old selection. This will change mSyncPosition. newPos = findSyncPosition(); if (newPos >= 0) { // Found it. Now verify that new selection is still selectable selectablePos = lookForSelectablePosition(newPos, true); if (selectablePos == newPos) { // Same row id is selected mSyncPosition = newPos; if (mSyncHeight == getHeight()) { // If we are at the same width as when we saved state, try // to restore the scroll position too. mLayoutMode = LAYOUT_SYNC; } else { // We are not the same width as when the selection was saved, so // don't try to restore the exact position mLayoutMode = LAYOUT_SET_SELECTION; } // Restore selection setNextSelectedPositionInt(newPos); return; } } } break; case SYNC_FIRST_POSITION: // Leave mSyncPosition as it is -- just pin to available range mLayoutMode = LAYOUT_SYNC; mSyncPosition = Math.min(Math.max(0, mSyncPosition), count - 1); return; } } if (!isInTouchMode()) { // We couldn't find matching data -- try to use the same position newPos = getSelectedItemPosition(); // Pin position to the available range if (newPos >= count) { newPos = count - 1; } if (newPos < 0) { newPos = 0; } // Make sure we select something selectable -- first look down selectablePos = lookForSelectablePosition(newPos, true); if (selectablePos >= 0) { setNextSelectedPositionInt(selectablePos); return; } else { // Looking down didn't work -- try looking up selectablePos = lookForSelectablePosition(newPos, false); if (selectablePos >= 0) { setNextSelectedPositionInt(selectablePos); return; } } } else { // We already know where we want to resurrect the selection if (mResurrectToPosition >= 0) { return; } } } // Nothing is selected. Give up and reset everything. mLayoutMode = mStackFromBottom ? LAYOUT_FORCE_BOTTOM : LAYOUT_FORCE_TOP; mSelectedPosition = INVALID_POSITION; mSelectedRowId = INVALID_ROW_ID; mNextSelectedPosition = INVALID_POSITION; mNextSelectedRowId = INVALID_ROW_ID; mNeedSync = false; mPendingSync = null; mSelectorPosition = INVALID_POSITION; checkSelectionChanged(); } @Override protected void onDisplayHint(int hint) { super.onDisplayHint(hint); switch (hint) { case INVISIBLE: if (mPopup != null && mPopup.isShowing()) { dismissPopup(); } break; case VISIBLE: if (mFiltered && mPopup != null && !mPopup.isShowing()) { showPopup(); } break; } mPopupHidden = hint == INVISIBLE; } /** * Removes the filter window */ private void dismissPopup() { if (mPopup != null) { mPopup.dismiss(); } } /** * Shows the filter window */ private void showPopup() { // Make sure we have a window before showing the popup if (getWindowVisibility() == View.VISIBLE) { createTextFilter(true); positionPopup(); // Make sure we get focus if we are showing the popup checkFocus(); } } private void positionPopup() { int screenHeight = getResources().getDisplayMetrics().heightPixels; final int[] xy = new int[2]; getLocationOnScreen(xy); // TODO: The 20 below should come from the theme // TODO: And the gravity should be defined in the theme as well final int bottomGap = screenHeight - xy[1] - getHeight() + (int) (mDensityScale * 20); if (!mPopup.isShowing()) { mPopup.showAtLocation(this, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, xy[0], bottomGap); } else { mPopup.update(xy[0], bottomGap, -1, -1); } } /** * What is the distance between the source and destination rectangles given the direction of * focus navigation between them? The direction basically helps figure out more quickly what is * self evident by the relationship between the rects... * * @param source the source rectangle * @param dest the destination rectangle * @param direction the direction * @return the distance between the rectangles */ static int getDistance(Rect source, Rect dest, int direction) { int sX, sY; // source x, y int dX, dY; // dest x, y switch (direction) { case View.FOCUS_RIGHT: sX = source.right; sY = source.top + source.height() / 2; dX = dest.left; dY = dest.top + dest.height() / 2; break; case View.FOCUS_DOWN: sX = source.left + source.width() / 2; sY = source.bottom; dX = dest.left + dest.width() / 2; dY = dest.top; break; case View.FOCUS_LEFT: sX = source.left; sY = source.top + source.height() / 2; dX = dest.right; dY = dest.top + dest.height() / 2; break; case View.FOCUS_UP: sX = source.left + source.width() / 2; sY = source.top; dX = dest.left + dest.width() / 2; dY = dest.bottom; break; case View.FOCUS_FORWARD: case View.FOCUS_BACKWARD: sX = source.right + source.width() / 2; sY = source.top + source.height() / 2; dX = dest.left + dest.width() / 2; dY = dest.top + dest.height() / 2; break; default: throw new IllegalArgumentException("direction must be one of " + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, " + "FOCUS_FORWARD, FOCUS_BACKWARD}."); } int deltaX = dX - sX; int deltaY = dY - sY; return deltaY * deltaY + deltaX * deltaX; } @Override protected boolean isInFilterMode() { return mFiltered; } /** * Sends a key to the text filter window * * @param keyCode The keycode for the event * @param event The actual key event * * @return True if the text filter handled the event, false otherwise. */ boolean sendToTextFilter(int keyCode, int count, KeyEvent event) { if (!acceptFilter()) { return false; } boolean handled = false; boolean okToSend = true; switch (keyCode) { case KeyEvent.KEYCODE_DPAD_UP: case KeyEvent.KEYCODE_DPAD_DOWN: case KeyEvent.KEYCODE_DPAD_LEFT: case KeyEvent.KEYCODE_DPAD_RIGHT: case KeyEvent.KEYCODE_DPAD_CENTER: case KeyEvent.KEYCODE_ENTER: okToSend = false; break; case KeyEvent.KEYCODE_BACK: if (mFiltered && mPopup != null && mPopup.isShowing()) { if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) { KeyEvent.DispatcherState state = getKeyDispatcherState(); if (state != null) { state.startTracking(event, this); } handled = true; } else if (event.getAction() == KeyEvent.ACTION_UP && event.isTracking() && !event.isCanceled()) { handled = true; mTextFilter.setText(""); } } okToSend = false; break; case KeyEvent.KEYCODE_SPACE: // Only send spaces once we are filtered okToSend = mFiltered; break; } if (okToSend) { createTextFilter(true); KeyEvent forwardEvent = event; if (forwardEvent.getRepeatCount() > 0) { forwardEvent = KeyEvent.changeTimeRepeat(event, event.getEventTime(), 0); } int action = event.getAction(); switch (action) { case KeyEvent.ACTION_DOWN: handled = mTextFilter.onKeyDown(keyCode, forwardEvent); break; case KeyEvent.ACTION_UP: handled = mTextFilter.onKeyUp(keyCode, forwardEvent); break; case KeyEvent.ACTION_MULTIPLE: handled = mTextFilter.onKeyMultiple(keyCode, count, event); break; } } return handled; } /** * Return an InputConnection for editing of the filter text. */ @Override public InputConnection onCreateInputConnection(EditorInfo outAttrs) { if (isTextFilterEnabled()) { // XXX we need to have the text filter created, so we can get an // InputConnection to proxy to. Unfortunately this means we pretty // much need to make it as soon as a list view gets focus. createTextFilter(false); if (mPublicInputConnection == null) { mDefInputConnection = new BaseInputConnection(this, false); mPublicInputConnection = new InputConnectionWrapper(mTextFilter.onCreateInputConnection(outAttrs), true) { @Override public boolean reportFullscreenMode(boolean enabled) { // Use our own input connection, since it is // the "real" one the IME is talking with. return mDefInputConnection.reportFullscreenMode(enabled); } @Override public boolean performEditorAction(int editorAction) { // The editor is off in its own window; we need to be // the one that does this. if (editorAction == EditorInfo.IME_ACTION_DONE) { InputMethodManager imm = (InputMethodManager) getContext() .getSystemService(Context.INPUT_METHOD_SERVICE); if (imm != null) { imm.hideSoftInputFromWindow(getWindowToken(), 0); } return true; } return false; } @Override public boolean sendKeyEvent(KeyEvent event) { // Use our own input connection, since the filter // text view may not be shown in a window so has // no ViewAncestor to dispatch events with. return mDefInputConnection.sendKeyEvent(event); } }; } outAttrs.inputType = EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_FILTER; outAttrs.imeOptions = EditorInfo.IME_ACTION_DONE; return mPublicInputConnection; } return null; } /** * For filtering we proxy an input connection to an internal text editor, * and this allows the proxying to happen. */ @Override public boolean checkInputConnectionProxy(View view) { return view == mTextFilter; } /** * Creates the window for the text filter and populates it with an EditText field; * * @param animateEntrance true if the window should appear with an animation */ private void createTextFilter(boolean animateEntrance) { if (mPopup == null) { Context c = getContext(); PopupWindow p = new PopupWindow(c); LayoutInflater layoutInflater = (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mTextFilter = (EditText) layoutInflater.inflate(R.layout.typing_filter, null); // For some reason setting this as the "real" input type changes // the text view in some way that it doesn't work, and I don't // want to figure out why this is. mTextFilter.setRawInputType(EditorInfo.TYPE_CLASS_TEXT | EditorInfo.TYPE_TEXT_VARIATION_FILTER); mTextFilter.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI); mTextFilter.addTextChangedListener(this); p.setFocusable(false); p.setTouchable(false); p.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED); p.setContentView(mTextFilter); p.setWidth(LayoutParams.WRAP_CONTENT); p.setHeight(LayoutParams.WRAP_CONTENT); p.setBackgroundDrawable(null); mPopup = p; getViewTreeObserver().addOnGlobalLayoutListener(this); mGlobalLayoutListenerAddedFilter = true; } if (animateEntrance) { mPopup.setAnimationStyle(R.style.Animation_TypingFilter); } else { mPopup.setAnimationStyle(R.style.Animation_TypingFilterRestore); } } /** * Clear the text filter. */ public void clearTextFilter() { if (mFiltered) { mTextFilter.setText(""); mFiltered = false; if (mPopup != null && mPopup.isShowing()) { dismissPopup(); } } } /** * Returns if the ListView currently has a text filter. */ public boolean hasTextFilter() { return mFiltered; } public void onGlobalLayout() { if (isShown()) { // Show the popup if we are filtered if (mFiltered && mPopup != null && !mPopup.isShowing() && !mPopupHidden) { showPopup(); } } else { // Hide the popup when we are no longer visible if (mPopup != null && mPopup.isShowing()) { dismissPopup(); } } } /** * For our text watcher that is associated with the text filter. Does * nothing. */ public void beforeTextChanged(CharSequence s, int start, int count, int after) { } /** * For our text watcher that is associated with the text filter. Performs * the actual filtering as the text changes, and takes care of hiding and * showing the popup displaying the currently entered filter text. */ public void onTextChanged(CharSequence s, int start, int before, int count) { if (mPopup != null && isTextFilterEnabled()) { int length = s.length(); boolean showing = mPopup.isShowing(); if (!showing && length > 0) { // Show the filter popup if necessary showPopup(); mFiltered = true; } else if (showing && length == 0) { // Remove the filter popup if the user has cleared all text dismissPopup(); mFiltered = false; } if (mAdapter instanceof Filterable) { Filter f = ((Filterable) mAdapter).getFilter(); // Filter should not be null when we reach this part if (f != null) { f.filter(s, this); } else { throw new IllegalStateException( "You cannot call onTextChanged with a non " + "filterable adapter"); } } } } /** * For our text watcher that is associated with the text filter. Does * nothing. */ public void afterTextChanged(Editable s) { } public void onFilterComplete(int count) { if (mSelectedPosition < 0 && count > 0) { mResurrectToPosition = INVALID_POSITION; resurrectSelection(); } } @Override protected ViewGroup.LayoutParams generateDefaultLayoutParams() { return new AbsListView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, 0); } @Override protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { return new LayoutParams(p); } @Override public LayoutParams generateLayoutParams(AttributeSet attrs) { return new AbsListView.LayoutParams(getContext(), attrs); } @Override protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { return p instanceof AbsListView.LayoutParams; } /** * Puts the list or grid into transcript mode. In this mode the list or grid will always scroll * to the bottom to show new items. * * @param mode the transcript mode to set * * @see #TRANSCRIPT_MODE_DISABLED * @see #TRANSCRIPT_MODE_NORMAL * @see #TRANSCRIPT_MODE_ALWAYS_SCROLL */ public void setTranscriptMode(int mode) { mTranscriptMode = mode; } /** * Returns the current transcript mode. * * @return {@link #TRANSCRIPT_MODE_DISABLED}, {@link #TRANSCRIPT_MODE_NORMAL} or * {@link #TRANSCRIPT_MODE_ALWAYS_SCROLL} */ public int getTranscriptMode() { return mTranscriptMode; } @Override public int getSolidColor() { return mCacheColorHint; } /** * When set to a non-zero value, the cache color hint indicates that this list is always drawn * on top of a solid, single-color, opaque background. * * Zero means that what's behind this object is translucent (non solid) or is not made of a * single color. This hint will not affect any existing background drawable set on this view ( * typically set via {@link #setBackgroundDrawable(Drawable)}). * * @param color The background color */ public void setCacheColorHint(int color) { if (color != mCacheColorHint) { mCacheColorHint = color; int count = getChildCount(); for (int i = 0; i < count; i++) { getChildAt(i).setDrawingCacheBackgroundColor(color); } mRecycler.setCacheColorHint(color); } } /** * When set to a non-zero value, the cache color hint indicates that this list is always drawn * on top of a solid, single-color, opaque background * * @return The cache color hint */ @ViewDebug.ExportedProperty(category = "drawing") public int getCacheColorHint() { return mCacheColorHint; } /** * Move all views (excluding headers and footers) held by this AbsListView into the supplied * List. This includes views displayed on the screen as well as views stored in AbsListView's * internal view recycler. * * @param views A list into which to put the reclaimed views */ public void reclaimViews(List<View> views) { int childCount = getChildCount(); RecyclerListener listener = mRecycler.mRecyclerListener; // Reclaim views on screen for (int i = 0; i < childCount; i++) { View child = getChildAt(i); AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams(); // Don't reclaim header or footer views, or views that should be ignored if (lp != null && mRecycler.shouldRecycleViewType(lp.viewType)) { views.add(child); // TODO fix this (j.m.) // ViewCompat.setAccessibilityDelegate(child, null); if (listener != null) { // Pretend they went through the scrap heap listener.onMovedToScrapHeap(child); } } } mRecycler.reclaimScrapViews(views); removeAllViewsInLayout(); } private void finishGlows() { if (mEdgeGlowTop != null) { mEdgeGlowTop.finish(); mEdgeGlowBottom.finish(); } } /** * This defers a notifyDataSetChanged on the pending RemoteViewsAdapter if it has not * connected yet. */ public void deferNotifyDataSetChanged() { mDeferNotifyDataSetChanged = true; } /** * Sets the recycler listener to be notified whenever a View is set aside in * the recycler for later reuse. This listener can be used to free resources * associated to the View. * * @param listener The recycler listener to be notified of views set aside * in the recycler. * * @see AbsListView.RecycleBin * @see AbsListView.RecyclerListener */ public void setRecyclerListener(RecyclerListener listener) { mRecycler.mRecyclerListener = listener; } class AdapterDataSetObserver extends AdapterView<ListAdapter>.AdapterDataSetObserver { @Override public void onChanged() { super.onChanged(); if (mFastScroller != null) { mFastScroller.onSectionsChanged(); } } @Override public void onInvalidated() { super.onInvalidated(); if (mFastScroller != null) { mFastScroller.onSectionsChanged(); } } } /** * A MultiChoiceModeListener receives events for {@link AbsListView#CHOICE_MODE_MULTIPLE_MODAL}. * It acts as the {@link ActionMode.Callback} for the selection mode and also receives * {@link #onItemCheckedStateChanged(ActionMode, int, long, boolean)} events when the user * selects and deselects list items. */ public interface MultiChoiceModeListener extends android.support.v7.view.ActionMode.Callback { /** * Called when an item is checked or unchecked during selection mode. * * @param mode The {@link ActionMode} providing the selection mode * @param position Adapter position of the item that was checked or unchecked * @param id Adapter ID of the item that was checked or unchecked * @param checked <code>true</code> if the item is now checked, <code>false</code> * if the item is now unchecked. */ public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked); } class MultiChoiceModeWrapper implements MultiChoiceModeListener { private MultiChoiceModeListener mWrapped; public void setWrapped(MultiChoiceModeListener wrapped) { mWrapped = wrapped; } public boolean hasWrappedCallback() { return mWrapped != null; } public boolean onCreateActionMode(android.support.v7.view.ActionMode mode, Menu menu) { if (mWrapped.onCreateActionMode(mode, menu)) { // Initialize checked graphic state? setLongClickable(false); return true; } return false; } public boolean onPrepareActionMode(android.support.v7.view.ActionMode mode, Menu menu) { return mWrapped.onPrepareActionMode(mode, menu); } public boolean onActionItemClicked(android.support.v7.view.ActionMode mode, MenuItem item) { return mWrapped.onActionItemClicked(mode, item); } public void onDestroyActionMode(ActionMode mode) { mWrapped.onDestroyActionMode(mode); mChoiceActionMode = null; // Ending selection mode means deselecting everything. clearChoices(); mDataChanged = true; rememberSyncState(); requestLayout(); setLongClickable(true); } public void onItemCheckedStateChanged(ActionMode mode, int position, long id, boolean checked) { mWrapped.onItemCheckedStateChanged(mode, position, id, checked); // If there are no items selected we no longer need the selection mode. if (getCheckedItemCount() == 0) { mode.finish(); } } } /** * AbsListView extends LayoutParams to provide a place to hold the view type. */ public static class LayoutParams extends ViewGroup.LayoutParams { /** * View type for this view, as returned by * {@link android.widget.Adapter#getItemViewType(int) } */ @ViewDebug.ExportedProperty(category = "list", mapping = { @ViewDebug.IntToString(from = ITEM_VIEW_TYPE_IGNORE, to = "ITEM_VIEW_TYPE_IGNORE"), @ViewDebug.IntToString(from = ITEM_VIEW_TYPE_HEADER_OR_FOOTER, to = "ITEM_VIEW_TYPE_HEADER_OR_FOOTER") }) int viewType; /** * When this boolean is set, the view has been added to the AbsListView * at least once. It is used to know whether headers/footers have already * been added to the list view and whether they should be treated as * recycled views or not. */ @ViewDebug.ExportedProperty(category = "list") boolean recycledHeaderFooter; /** * When an AbsListView is measured with an AT_MOST measure spec, it needs * to obtain children views to measure itself. When doing so, the children * are not attached to the window, but put in the recycler which assumes * they've been attached before. Setting this flag will force the reused * view to be attached to the window rather than just attached to the * parent. */ @ViewDebug.ExportedProperty(category = "list") boolean forceAdd; /** * The position the view was removed from when pulled out of the * scrap heap. * @hide */ int scrappedFromPosition; /** * The ID the view represents */ long itemId = -1; public LayoutParams(Context c, AttributeSet attrs) { super(c, attrs); } public LayoutParams(int w, int h) { super(w, h); } public LayoutParams(int w, int h, int viewType) { super(w, h); this.viewType = viewType; } public LayoutParams(ViewGroup.LayoutParams source) { super(source); } } /** * A RecyclerListener is used to receive a notification whenever a View is placed * inside the RecycleBin's scrap heap. This listener is used to free resources * associated to Views placed in the RecycleBin. * * @see AbsListView.RecycleBin * @see AbsListView#setRecyclerListener(AbsListView.RecyclerListener) */ public static interface RecyclerListener { /** * Indicates that the specified View was moved into the recycler's scrap heap. * The view is not displayed on screen any more and any expensive resource * associated with the view should be discarded. * * @param view */ void onMovedToScrapHeap(View view); } /** * The RecycleBin facilitates reuse of views across layouts. The RecycleBin has two levels of * storage: ActiveViews and ScrapViews. ActiveViews are those views which were onscreen at the * start of a layout. By construction, they are displaying current information. At the end of * layout, all views in ActiveViews are demoted to ScrapViews. ScrapViews are old views that * could potentially be used by the adapter to avoid allocating views unnecessarily. * * @see android.widget.AbsListView#setRecyclerListener(android.widget.AbsListView.RecyclerListener) * @see android.widget.AbsListView.RecyclerListener */ class RecycleBin { private RecyclerListener mRecyclerListener; /** * The position of the first view stored in mActiveViews. */ private int mFirstActivePosition; /** * Views that were on screen at the start of layout. This array is populated at the start of * layout, and at the end of layout all view in mActiveViews are moved to mScrapViews. * Views in mActiveViews represent a contiguous range of Views, with position of the first * view store in mFirstActivePosition. */ private View[] mActiveViews = new View[0]; /** * Unsorted views that can be used by the adapter as a convert view. */ private ArrayList<View>[] mScrapViews; private int mViewTypeCount; private ArrayList<View> mCurrentScrap; private ArrayList<View> mSkippedScrap; private SparseArray<View> mTransientStateViews; public void setViewTypeCount(int viewTypeCount) { if (viewTypeCount < 1) { throw new IllegalArgumentException("Can't have a viewTypeCount < 1"); } //noinspection unchecked ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount]; for (int i = 0; i < viewTypeCount; i++) { scrapViews[i] = new ArrayList<View>(); } mViewTypeCount = viewTypeCount; mCurrentScrap = scrapViews[0]; mScrapViews = scrapViews; } public void markChildrenDirty() { if (mViewTypeCount == 1) { final ArrayList<View> scrap = mCurrentScrap; final int scrapCount = scrap.size(); for (int i = 0; i < scrapCount; i++) { scrap.get(i).forceLayout(); } } else { final int typeCount = mViewTypeCount; for (int i = 0; i < typeCount; i++) { final ArrayList<View> scrap = mScrapViews[i]; final int scrapCount = scrap.size(); for (int j = 0; j < scrapCount; j++) { scrap.get(j).forceLayout(); } } } if (mTransientStateViews != null) { final int count = mTransientStateViews.size(); for (int i = 0; i < count; i++) { mTransientStateViews.valueAt(i).forceLayout(); } } } public boolean shouldRecycleViewType(int viewType) { return viewType >= 0; } /** * Clears the scrap heap. */ void clear() { if (mViewTypeCount == 1) { final ArrayList<View> scrap = mCurrentScrap; final int scrapCount = scrap.size(); for (int i = 0; i < scrapCount; i++) { removeDetachedView(scrap.remove(scrapCount - 1 - i), false); } } else { final int typeCount = mViewTypeCount; for (int i = 0; i < typeCount; i++) { final ArrayList<View> scrap = mScrapViews[i]; final int scrapCount = scrap.size(); for (int j = 0; j < scrapCount; j++) { removeDetachedView(scrap.remove(scrapCount - 1 - j), false); } } } if (mTransientStateViews != null) { mTransientStateViews.clear(); } } /** * Fill ActiveViews with all of the children of the AbsListView. * * @param childCount The minimum number of views mActiveViews should hold * @param firstActivePosition The position of the first view that will be stored in * mActiveViews */ void fillActiveViews(int childCount, int firstActivePosition) { if (mActiveViews.length < childCount) { mActiveViews = new View[childCount]; } mFirstActivePosition = firstActivePosition; final View[] activeViews = mActiveViews; for (int i = 0; i < childCount; i++) { View child = getChildAt(i); AbsListView.LayoutParams lp = (AbsListView.LayoutParams) child.getLayoutParams(); // Don't put header or footer views into the scrap heap if (lp != null && lp.viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER) { // Note: We do place AdapterView.ITEM_VIEW_TYPE_IGNORE in active views. // However, we will NOT place them into scrap views. activeViews[i] = child; } } } /** * Get the view corresponding to the specified position. The view will be removed from * mActiveViews if it is found. * * @param position The position to look up in mActiveViews * @return The view if it is found, null otherwise */ View getActiveView(int position) { int index = position - mFirstActivePosition; final View[] activeViews = mActiveViews; if (index >= 0 && index < activeViews.length) { final View match = activeViews[index]; activeViews[index] = null; return match; } return null; } View getTransientStateView(int position) { if (mTransientStateViews == null) { return null; } final int index = mTransientStateViews.indexOfKey(position); if (index < 0) { return null; } final View result = mTransientStateViews.valueAt(index); final int key = mTransientStateViews.keyAt(index); mTransientStateViews.remove(key); return result; } /** * Dump any currently saved views with transient state. */ void clearTransientStateViews() { if (mTransientStateViews != null) { mTransientStateViews.clear(); } } /** * @return A view from the ScrapViews collection. These are unordered. */ View getScrapView(int position) { if (mViewTypeCount == 1) { return retrieveFromScrap(mCurrentScrap, position); } else { int whichScrap = mAdapter.getItemViewType(position); if (whichScrap >= 0 && whichScrap < mScrapViews.length) { return retrieveFromScrap(mScrapViews[whichScrap], position); } } return null; } /** * Put a view into the ScrapViews list. These views are unordered. * * @param scrap The view to add */ void addScrapView(View scrap, int position) { AbsListView.LayoutParams lp = (AbsListView.LayoutParams) scrap.getLayoutParams(); if (lp == null) { return; } lp.scrappedFromPosition = position; // Don't put header or footer views or views that should be ignored // into the scrap heap int viewType = lp.viewType; final boolean scrapHasTransientState = ViewCompat.hasTransientState(scrap); if (!shouldRecycleViewType(viewType) || scrapHasTransientState) { if (viewType != ITEM_VIEW_TYPE_HEADER_OR_FOOTER || scrapHasTransientState) { if (mSkippedScrap == null) { mSkippedScrap = new ArrayList<View>(); } mSkippedScrap.add(scrap); } if (scrapHasTransientState) { if (mTransientStateViews == null) { mTransientStateViews = new SparseArray<View>(); } AdapterView.dispatchStartTemporaryDetach(scrap); mTransientStateViews.put(position, scrap); } return; } AdapterView.dispatchStartTemporaryDetach(scrap); if (mViewTypeCount == 1) { mCurrentScrap.add(scrap); } else { mScrapViews[viewType].add(scrap); } // TODO fix this (j.m.) // ViewCompat.setAccessibilityDelegate(scrap, null); if (mRecyclerListener != null) { mRecyclerListener.onMovedToScrapHeap(scrap); } } /** * Finish the removal of any views that skipped the scrap heap. */ void removeSkippedScrap() { if (mSkippedScrap == null) { return; } final int count = mSkippedScrap.size(); for (int i = 0; i < count; i++) { removeDetachedView(mSkippedScrap.get(i), false); } mSkippedScrap.clear(); } /** * Move all views remaining in mActiveViews to mScrapViews. */ void scrapActiveViews() { final View[] activeViews = mActiveViews; final boolean hasListener = mRecyclerListener != null; final boolean multipleScraps = mViewTypeCount > 1; ArrayList<View> scrapViews = mCurrentScrap; final int count = activeViews.length; for (int i = count - 1; i >= 0; i--) { final View victim = activeViews[i]; if (victim != null) { final AbsListView.LayoutParams lp = (AbsListView.LayoutParams) victim.getLayoutParams(); int whichScrap = lp.viewType; activeViews[i] = null; final boolean scrapHasTransientState = ViewCompat.hasTransientState(victim); if (!shouldRecycleViewType(whichScrap) || scrapHasTransientState) { // Do not move views that should be ignored if (whichScrap != ITEM_VIEW_TYPE_HEADER_OR_FOOTER || scrapHasTransientState) { removeDetachedView(victim, false); } if (scrapHasTransientState) { if (mTransientStateViews == null) { mTransientStateViews = new SparseArray<View>(); } mTransientStateViews.put(mFirstActivePosition + i, victim); } continue; } if (multipleScraps) { scrapViews = mScrapViews[whichScrap]; } AdapterView.dispatchStartTemporaryDetach(victim); lp.scrappedFromPosition = mFirstActivePosition + i; scrapViews.add(victim); // TODO fix this (j.m.) // ViewCompat.setAccessibilityDelegate(victim, null); if (hasListener) { mRecyclerListener.onMovedToScrapHeap(victim); } } } pruneScrapViews(); } /** * Makes sure that the size of mScrapViews does not exceed the size of mActiveViews. * (This can happen if an adapter does not recycle its views). */ private void pruneScrapViews() { final int maxViews = mActiveViews.length; final int viewTypeCount = mViewTypeCount; final ArrayList<View>[] scrapViews = mScrapViews; for (int i = 0; i < viewTypeCount; ++i) { final ArrayList<View> scrapPile = scrapViews[i]; int size = scrapPile.size(); final int extras = size - maxViews; size--; for (int j = 0; j < extras; j++) { removeDetachedView(scrapPile.remove(size--), false); } } if (mTransientStateViews != null) { for (int i = 0; i < mTransientStateViews.size(); i++) { final View v = mTransientStateViews.valueAt(i); if (!ViewCompat.hasTransientState(v)) { final int key = mTransientStateViews.keyAt(i); mTransientStateViews.remove(key); i--; } } } } /** * Puts all views in the scrap heap into the supplied list. */ void reclaimScrapViews(List<View> views) { if (mViewTypeCount == 1) { views.addAll(mCurrentScrap); } else { final int viewTypeCount = mViewTypeCount; final ArrayList<View>[] scrapViews = mScrapViews; for (int i = 0; i < viewTypeCount; ++i) { final ArrayList<View> scrapPile = scrapViews[i]; views.addAll(scrapPile); } } } /** * Updates the cache color hint of all known views. * * @param color The new cache color hint. */ void setCacheColorHint(int color) { if (mViewTypeCount == 1) { final ArrayList<View> scrap = mCurrentScrap; final int scrapCount = scrap.size(); for (int i = 0; i < scrapCount; i++) { scrap.get(i).setDrawingCacheBackgroundColor(color); } } else { final int typeCount = mViewTypeCount; for (int i = 0; i < typeCount; i++) { final ArrayList<View> scrap = mScrapViews[i]; final int scrapCount = scrap.size(); for (int j = 0; j < scrapCount; j++) { scrap.get(j).setDrawingCacheBackgroundColor(color); } } } // Just in case this is called during a layout pass final View[] activeViews = mActiveViews; final int count = activeViews.length; for (int i = 0; i < count; ++i) { final View victim = activeViews[i]; if (victim != null) { victim.setDrawingCacheBackgroundColor(color); } } } } static View retrieveFromScrap(ArrayList<View> scrapViews, int position) { int size = scrapViews.size(); if (size > 0) { // See if we still have a view for this position. for (int i = 0; i < size; i++) { View view = scrapViews.get(i); if (((AbsListView.LayoutParams) view.getLayoutParams()).scrappedFromPosition == position) { scrapViews.remove(i); return view; } } return scrapViews.remove(size - 1); } else { return null; } } }