1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/widget/TwoWayView.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,6543 @@
1.4 +/*
1.5 + * Copyright (C) 2013 Lucas Rocha
1.6 + *
1.7 + * This code is based on bits and pieces of Android's AbsListView,
1.8 + * Listview, and StaggeredGridView.
1.9 + *
1.10 + * Copyright (C) 2012 The Android Open Source Project
1.11 + *
1.12 + * Licensed under the Apache License, Version 2.0 (the "License");
1.13 + * you may not use this file except in compliance with the License.
1.14 + * You may obtain a copy of the License at
1.15 + *
1.16 + * http://www.apache.org/licenses/LICENSE-2.0
1.17 + *
1.18 + * Unless required by applicable law or agreed to in writing, software
1.19 + * distributed under the License is distributed on an "AS IS" BASIS,
1.20 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.21 + * See the License for the specific language governing permissions and
1.22 + * limitations under the License.
1.23 + */
1.24 +
1.25 +package org.mozilla.gecko.widget;
1.26 +
1.27 +import org.mozilla.gecko.R;
1.28 +
1.29 +import android.annotation.TargetApi;
1.30 +import android.content.Context;
1.31 +import android.content.res.TypedArray;
1.32 +import android.database.DataSetObserver;
1.33 +import android.graphics.Canvas;
1.34 +import android.graphics.Rect;
1.35 +import android.graphics.drawable.Drawable;
1.36 +import android.graphics.drawable.TransitionDrawable;
1.37 +import android.os.Build;
1.38 +import android.os.Bundle;
1.39 +import android.os.Parcel;
1.40 +import android.os.Parcelable;
1.41 +import android.os.SystemClock;
1.42 +import android.support.v4.util.LongSparseArray;
1.43 +import android.support.v4.util.SparseArrayCompat;
1.44 +import android.support.v4.view.AccessibilityDelegateCompat;
1.45 +import android.support.v4.view.KeyEventCompat;
1.46 +import android.support.v4.view.MotionEventCompat;
1.47 +import android.support.v4.view.VelocityTrackerCompat;
1.48 +import android.support.v4.view.ViewCompat;
1.49 +import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;
1.50 +import android.support.v4.widget.EdgeEffectCompat;
1.51 +import android.util.AttributeSet;
1.52 +import android.util.Log;
1.53 +import android.util.SparseBooleanArray;
1.54 +import android.view.ContextMenu.ContextMenuInfo;
1.55 +import android.view.FocusFinder;
1.56 +import android.view.HapticFeedbackConstants;
1.57 +import android.view.KeyEvent;
1.58 +import android.view.MotionEvent;
1.59 +import android.view.SoundEffectConstants;
1.60 +import android.view.VelocityTracker;
1.61 +import android.view.View;
1.62 +import android.view.ViewConfiguration;
1.63 +import android.view.ViewGroup;
1.64 +import android.view.ViewParent;
1.65 +import android.view.ViewTreeObserver;
1.66 +import android.view.accessibility.AccessibilityEvent;
1.67 +import android.view.accessibility.AccessibilityNodeInfo;
1.68 +import android.widget.AdapterView;
1.69 +import android.widget.Checkable;
1.70 +import android.widget.ListAdapter;
1.71 +import android.widget.Scroller;
1.72 +
1.73 +import java.util.ArrayList;
1.74 +import java.util.List;
1.75 +
1.76 +/*
1.77 + * Implementation Notes:
1.78 + *
1.79 + * Some terminology:
1.80 + *
1.81 + * index - index of the items that are currently visible
1.82 + * position - index of the items in the cursor
1.83 + *
1.84 + * Given the bi-directional nature of this view, the source code
1.85 + * usually names variables with 'start' to mean 'top' or 'left'; and
1.86 + * 'end' to mean 'bottom' or 'right', depending on the current
1.87 + * orientation of the widget.
1.88 + */
1.89 +
1.90 +/**
1.91 + * A view that shows items in a vertical or horizontal scrolling list.
1.92 + * The items come from the {@link ListAdapter} associated with this view.
1.93 + */
1.94 +public class TwoWayView extends AdapterView<ListAdapter> implements
1.95 + ViewTreeObserver.OnTouchModeChangeListener {
1.96 + private static final String LOGTAG = "TwoWayView";
1.97 +
1.98 + private static final int NO_POSITION = -1;
1.99 + private static final int INVALID_POINTER = -1;
1.100 +
1.101 + public static final int[] STATE_NOTHING = new int[] { 0 };
1.102 +
1.103 + private static final int TOUCH_MODE_REST = -1;
1.104 + private static final int TOUCH_MODE_DOWN = 0;
1.105 + private static final int TOUCH_MODE_TAP = 1;
1.106 + private static final int TOUCH_MODE_DONE_WAITING = 2;
1.107 + private static final int TOUCH_MODE_DRAGGING = 3;
1.108 + private static final int TOUCH_MODE_FLINGING = 4;
1.109 + private static final int TOUCH_MODE_OVERSCROLL = 5;
1.110 +
1.111 + private static final int TOUCH_MODE_UNKNOWN = -1;
1.112 + private static final int TOUCH_MODE_ON = 0;
1.113 + private static final int TOUCH_MODE_OFF = 1;
1.114 +
1.115 + private static final int LAYOUT_NORMAL = 0;
1.116 + private static final int LAYOUT_FORCE_TOP = 1;
1.117 + private static final int LAYOUT_SET_SELECTION = 2;
1.118 + private static final int LAYOUT_FORCE_BOTTOM = 3;
1.119 + private static final int LAYOUT_SPECIFIC = 4;
1.120 + private static final int LAYOUT_SYNC = 5;
1.121 + private static final int LAYOUT_MOVE_SELECTION = 6;
1.122 +
1.123 + private static final int SYNC_SELECTED_POSITION = 0;
1.124 + private static final int SYNC_FIRST_POSITION = 1;
1.125 +
1.126 + private static final int SYNC_MAX_DURATION_MILLIS = 100;
1.127 +
1.128 + private static final int CHECK_POSITION_SEARCH_DISTANCE = 20;
1.129 +
1.130 + private static final float MAX_SCROLL_FACTOR = 0.33f;
1.131 +
1.132 + private static final int MIN_SCROLL_PREVIEW_PIXELS = 10;
1.133 +
1.134 + public static enum ChoiceMode {
1.135 + NONE,
1.136 + SINGLE,
1.137 + MULTIPLE
1.138 + }
1.139 +
1.140 + public static enum Orientation {
1.141 + HORIZONTAL,
1.142 + VERTICAL;
1.143 + };
1.144 +
1.145 + private ListAdapter mAdapter;
1.146 +
1.147 + private boolean mIsVertical;
1.148 +
1.149 + private int mItemMargin;
1.150 +
1.151 + private boolean mInLayout;
1.152 + private boolean mBlockLayoutRequests;
1.153 +
1.154 + private boolean mIsAttached;
1.155 +
1.156 + private final RecycleBin mRecycler;
1.157 + private AdapterDataSetObserver mDataSetObserver;
1.158 +
1.159 + private boolean mItemsCanFocus;
1.160 +
1.161 + final boolean[] mIsScrap = new boolean[1];
1.162 +
1.163 + private boolean mDataChanged;
1.164 + private int mItemCount;
1.165 + private int mOldItemCount;
1.166 + private boolean mHasStableIds;
1.167 + private boolean mAreAllItemsSelectable;
1.168 +
1.169 + private int mFirstPosition;
1.170 + private int mSpecificStart;
1.171 +
1.172 + private SavedState mPendingSync;
1.173 +
1.174 + private final int mTouchSlop;
1.175 + private final int mMaximumVelocity;
1.176 + private final int mFlingVelocity;
1.177 + private float mLastTouchPos;
1.178 + private float mTouchRemainderPos;
1.179 + private int mActivePointerId;
1.180 +
1.181 + private final Rect mTempRect;
1.182 +
1.183 + private final ArrowScrollFocusResult mArrowScrollFocusResult;
1.184 +
1.185 + private Rect mTouchFrame;
1.186 + private int mMotionPosition;
1.187 + private CheckForTap mPendingCheckForTap;
1.188 + private CheckForLongPress mPendingCheckForLongPress;
1.189 + private CheckForKeyLongPress mPendingCheckForKeyLongPress;
1.190 + private PerformClick mPerformClick;
1.191 + private Runnable mTouchModeReset;
1.192 + private int mResurrectToPosition;
1.193 +
1.194 + private boolean mIsChildViewEnabled;
1.195 +
1.196 + private boolean mDrawSelectorOnTop;
1.197 + private Drawable mSelector;
1.198 + private int mSelectorPosition;
1.199 + private final Rect mSelectorRect;
1.200 +
1.201 + private int mOverScroll;
1.202 + private final int mOverscrollDistance;
1.203 +
1.204 + private boolean mDesiredFocusableState;
1.205 + private boolean mDesiredFocusableInTouchModeState;
1.206 +
1.207 + private SelectionNotifier mSelectionNotifier;
1.208 +
1.209 + private boolean mNeedSync;
1.210 + private int mSyncMode;
1.211 + private int mSyncPosition;
1.212 + private long mSyncRowId;
1.213 + private long mSyncHeight;
1.214 + private int mSelectedStart;
1.215 +
1.216 + private int mNextSelectedPosition;
1.217 + private long mNextSelectedRowId;
1.218 + private int mSelectedPosition;
1.219 + private long mSelectedRowId;
1.220 + private int mOldSelectedPosition;
1.221 + private long mOldSelectedRowId;
1.222 +
1.223 + private ChoiceMode mChoiceMode;
1.224 + private int mCheckedItemCount;
1.225 + private SparseBooleanArray mCheckStates;
1.226 + LongSparseArray<Integer> mCheckedIdStates;
1.227 +
1.228 + private ContextMenuInfo mContextMenuInfo;
1.229 +
1.230 + private int mLayoutMode;
1.231 + private int mTouchMode;
1.232 + private int mLastTouchMode;
1.233 + private VelocityTracker mVelocityTracker;
1.234 + private final Scroller mScroller;
1.235 +
1.236 + private EdgeEffectCompat mStartEdge;
1.237 + private EdgeEffectCompat mEndEdge;
1.238 +
1.239 + private OnScrollListener mOnScrollListener;
1.240 + private int mLastScrollState;
1.241 +
1.242 + private View mEmptyView;
1.243 +
1.244 + private ListItemAccessibilityDelegate mAccessibilityDelegate;
1.245 +
1.246 + private int mLastAccessibilityScrollEventFromIndex;
1.247 + private int mLastAccessibilityScrollEventToIndex;
1.248 +
1.249 + public interface OnScrollListener {
1.250 +
1.251 + /**
1.252 + * The view is not scrolling. Note navigating the list using the trackball counts as
1.253 + * being in the idle state since these transitions are not animated.
1.254 + */
1.255 + public static int SCROLL_STATE_IDLE = 0;
1.256 +
1.257 + /**
1.258 + * The user is scrolling using touch, and their finger is still on the screen
1.259 + */
1.260 + public static int SCROLL_STATE_TOUCH_SCROLL = 1;
1.261 +
1.262 + /**
1.263 + * The user had previously been scrolling using touch and had performed a fling. The
1.264 + * animation is now coasting to a stop
1.265 + */
1.266 + public static int SCROLL_STATE_FLING = 2;
1.267 +
1.268 + /**
1.269 + * Callback method to be invoked while the list view or grid view is being scrolled. If the
1.270 + * view is being scrolled, this method will be called before the next frame of the scroll is
1.271 + * rendered. In particular, it will be called before any calls to
1.272 + * {@link Adapter#getView(int, View, ViewGroup)}.
1.273 + *
1.274 + * @param view The view whose scroll state is being reported
1.275 + *
1.276 + * @param scrollState The current scroll state. One of {@link #SCROLL_STATE_IDLE},
1.277 + * {@link #SCROLL_STATE_TOUCH_SCROLL} or {@link #SCROLL_STATE_IDLE}.
1.278 + */
1.279 + public void onScrollStateChanged(TwoWayView view, int scrollState);
1.280 +
1.281 + /**
1.282 + * Callback method to be invoked when the list or grid has been scrolled. This will be
1.283 + * called after the scroll has completed
1.284 + * @param view The view whose scroll state is being reported
1.285 + * @param firstVisibleItem the index of the first visible cell (ignore if
1.286 + * visibleItemCount == 0)
1.287 + * @param visibleItemCount the number of visible cells
1.288 + * @param totalItemCount the number of items in the list adaptor
1.289 + */
1.290 + public void onScroll(TwoWayView view, int firstVisibleItem, int visibleItemCount,
1.291 + int totalItemCount);
1.292 + }
1.293 +
1.294 + /**
1.295 + * A RecyclerListener is used to receive a notification whenever a View is placed
1.296 + * inside the RecycleBin's scrap heap. This listener is used to free resources
1.297 + * associated to Views placed in the RecycleBin.
1.298 + *
1.299 + * @see TwoWayView.RecycleBin
1.300 + * @see TwoWayView#setRecyclerListener(TwoWayView.RecyclerListener)
1.301 + */
1.302 + public static interface RecyclerListener {
1.303 + /**
1.304 + * Indicates that the specified View was moved into the recycler's scrap heap.
1.305 + * The view is not displayed on screen any more and any expensive resource
1.306 + * associated with the view should be discarded.
1.307 + *
1.308 + * @param view
1.309 + */
1.310 + void onMovedToScrapHeap(View view);
1.311 + }
1.312 +
1.313 + public TwoWayView(Context context) {
1.314 + this(context, null);
1.315 + }
1.316 +
1.317 + public TwoWayView(Context context, AttributeSet attrs) {
1.318 + this(context, attrs, 0);
1.319 + }
1.320 +
1.321 + public TwoWayView(Context context, AttributeSet attrs, int defStyle) {
1.322 + super(context, attrs, defStyle);
1.323 +
1.324 + mNeedSync = false;
1.325 + mVelocityTracker = null;
1.326 +
1.327 + mLayoutMode = LAYOUT_NORMAL;
1.328 + mTouchMode = TOUCH_MODE_REST;
1.329 + mLastTouchMode = TOUCH_MODE_UNKNOWN;
1.330 +
1.331 + mIsAttached = false;
1.332 +
1.333 + mContextMenuInfo = null;
1.334 +
1.335 + mOnScrollListener = null;
1.336 + mLastScrollState = OnScrollListener.SCROLL_STATE_IDLE;
1.337 +
1.338 + final ViewConfiguration vc = ViewConfiguration.get(context);
1.339 + mTouchSlop = vc.getScaledTouchSlop();
1.340 + mMaximumVelocity = vc.getScaledMaximumFlingVelocity();
1.341 + mFlingVelocity = vc.getScaledMinimumFlingVelocity();
1.342 + mOverscrollDistance = getScaledOverscrollDistance(vc);
1.343 +
1.344 + mOverScroll = 0;
1.345 +
1.346 + mScroller = new Scroller(context);
1.347 +
1.348 + mIsVertical = true;
1.349 +
1.350 + mItemsCanFocus = false;
1.351 +
1.352 + mTempRect = new Rect();
1.353 +
1.354 + mArrowScrollFocusResult = new ArrowScrollFocusResult();
1.355 +
1.356 + mSelectorPosition = INVALID_POSITION;
1.357 +
1.358 + mSelectorRect = new Rect();
1.359 + mSelectedStart = 0;
1.360 +
1.361 + mResurrectToPosition = INVALID_POSITION;
1.362 +
1.363 + mSelectedStart = 0;
1.364 + mNextSelectedPosition = INVALID_POSITION;
1.365 + mNextSelectedRowId = INVALID_ROW_ID;
1.366 + mSelectedPosition = INVALID_POSITION;
1.367 + mSelectedRowId = INVALID_ROW_ID;
1.368 + mOldSelectedPosition = INVALID_POSITION;
1.369 + mOldSelectedRowId = INVALID_ROW_ID;
1.370 +
1.371 + mChoiceMode = ChoiceMode.NONE;
1.372 + mCheckedItemCount = 0;
1.373 + mCheckedIdStates = null;
1.374 + mCheckStates = null;
1.375 +
1.376 + mRecycler = new RecycleBin();
1.377 + mDataSetObserver = null;
1.378 +
1.379 + mAreAllItemsSelectable = true;
1.380 +
1.381 + mStartEdge = null;
1.382 + mEndEdge = null;
1.383 +
1.384 + setClickable(true);
1.385 + setFocusableInTouchMode(true);
1.386 + setWillNotDraw(false);
1.387 + setAlwaysDrawnWithCacheEnabled(false);
1.388 + setWillNotDraw(false);
1.389 + setClipToPadding(false);
1.390 +
1.391 + ViewCompat.setOverScrollMode(this, ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS);
1.392 +
1.393 + TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TwoWayView, defStyle, 0);
1.394 + initializeScrollbars(a);
1.395 +
1.396 + mDrawSelectorOnTop = a.getBoolean(
1.397 + R.styleable.TwoWayView_android_drawSelectorOnTop, false);
1.398 +
1.399 + Drawable d = a.getDrawable(R.styleable.TwoWayView_android_listSelector);
1.400 + if (d != null) {
1.401 + setSelector(d);
1.402 + }
1.403 +
1.404 + int orientation = a.getInt(R.styleable.TwoWayView_android_orientation, -1);
1.405 + if (orientation >= 0) {
1.406 + setOrientation(Orientation.values()[orientation]);
1.407 + }
1.408 +
1.409 + int choiceMode = a.getInt(R.styleable.TwoWayView_android_choiceMode, -1);
1.410 + if (choiceMode >= 0) {
1.411 + setChoiceMode(ChoiceMode.values()[choiceMode]);
1.412 + }
1.413 +
1.414 + a.recycle();
1.415 +
1.416 + updateScrollbarsDirection();
1.417 + }
1.418 +
1.419 + public void setOrientation(Orientation orientation) {
1.420 + final boolean isVertical = (orientation.compareTo(Orientation.VERTICAL) == 0);
1.421 + if (mIsVertical == isVertical) {
1.422 + return;
1.423 + }
1.424 +
1.425 + mIsVertical = isVertical;
1.426 +
1.427 + updateScrollbarsDirection();
1.428 + resetState();
1.429 + mRecycler.clear();
1.430 +
1.431 + requestLayout();
1.432 + }
1.433 +
1.434 + public Orientation getOrientation() {
1.435 + return (mIsVertical ? Orientation.VERTICAL : Orientation.HORIZONTAL);
1.436 + }
1.437 +
1.438 + public void setItemMargin(int itemMargin) {
1.439 + if (mItemMargin == itemMargin) {
1.440 + return;
1.441 + }
1.442 +
1.443 + mItemMargin = itemMargin;
1.444 + requestLayout();
1.445 + }
1.446 +
1.447 + public int getItemMargin() {
1.448 + return mItemMargin;
1.449 + }
1.450 +
1.451 + /**
1.452 + * Indicates that the views created by the ListAdapter can contain focusable
1.453 + * items.
1.454 + *
1.455 + * @param itemsCanFocus true if items can get focus, false otherwise
1.456 + */
1.457 + public void setItemsCanFocus(boolean itemsCanFocus) {
1.458 + mItemsCanFocus = itemsCanFocus;
1.459 + if (!itemsCanFocus) {
1.460 + setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
1.461 + }
1.462 + }
1.463 +
1.464 + /**
1.465 + * @return Whether the views created by the ListAdapter can contain focusable
1.466 + * items.
1.467 + */
1.468 + public boolean getItemsCanFocus() {
1.469 + return mItemsCanFocus;
1.470 + }
1.471 +
1.472 + /**
1.473 + * Set the listener that will receive notifications every time the list scrolls.
1.474 + *
1.475 + * @param l the scroll listener
1.476 + */
1.477 + public void setOnScrollListener(OnScrollListener l) {
1.478 + mOnScrollListener = l;
1.479 + invokeOnItemScrollListener();
1.480 + }
1.481 +
1.482 + /**
1.483 + * Sets the recycler listener to be notified whenever a View is set aside in
1.484 + * the recycler for later reuse. This listener can be used to free resources
1.485 + * associated to the View.
1.486 + *
1.487 + * @param listener The recycler listener to be notified of views set aside
1.488 + * in the recycler.
1.489 + *
1.490 + * @see TwoWayView.RecycleBin
1.491 + * @see TwoWayView.RecyclerListener
1.492 + */
1.493 + public void setRecyclerListener(RecyclerListener l) {
1.494 + mRecycler.mRecyclerListener = l;
1.495 + }
1.496 +
1.497 + /**
1.498 + * Controls whether the selection highlight drawable should be drawn on top of the item or
1.499 + * behind it.
1.500 + *
1.501 + * @param onTop If true, the selector will be drawn on the item it is highlighting. The default
1.502 + * is false.
1.503 + *
1.504 + * @attr ref android.R.styleable#AbsListView_drawSelectorOnTop
1.505 + */
1.506 + public void setDrawSelectorOnTop(boolean drawSelectorOnTop) {
1.507 + mDrawSelectorOnTop = drawSelectorOnTop;
1.508 + }
1.509 +
1.510 + /**
1.511 + * Set a Drawable that should be used to highlight the currently selected item.
1.512 + *
1.513 + * @param resID A Drawable resource to use as the selection highlight.
1.514 + *
1.515 + * @attr ref android.R.styleable#AbsListView_listSelector
1.516 + */
1.517 + public void setSelector(int resID) {
1.518 + setSelector(getResources().getDrawable(resID));
1.519 + }
1.520 +
1.521 + /**
1.522 + * Set a Drawable that should be used to highlight the currently selected item.
1.523 + *
1.524 + * @param selector A Drawable to use as the selection highlight.
1.525 + *
1.526 + * @attr ref android.R.styleable#AbsListView_listSelector
1.527 + */
1.528 + public void setSelector(Drawable selector) {
1.529 + if (mSelector != null) {
1.530 + mSelector.setCallback(null);
1.531 + unscheduleDrawable(mSelector);
1.532 + }
1.533 +
1.534 + mSelector = selector;
1.535 + Rect padding = new Rect();
1.536 + selector.getPadding(padding);
1.537 +
1.538 + selector.setCallback(this);
1.539 + updateSelectorState();
1.540 + }
1.541 +
1.542 + /**
1.543 + * Returns the selector {@link android.graphics.drawable.Drawable} that is used to draw the
1.544 + * selection in the list.
1.545 + *
1.546 + * @return the drawable used to display the selector
1.547 + */
1.548 + public Drawable getSelector() {
1.549 + return mSelector;
1.550 + }
1.551 +
1.552 + /**
1.553 + * {@inheritDoc}
1.554 + */
1.555 + @Override
1.556 + public int getSelectedItemPosition() {
1.557 + return mNextSelectedPosition;
1.558 + }
1.559 +
1.560 + /**
1.561 + * {@inheritDoc}
1.562 + */
1.563 + @Override
1.564 + public long getSelectedItemId() {
1.565 + return mNextSelectedRowId;
1.566 + }
1.567 +
1.568 + /**
1.569 + * Returns the number of items currently selected. This will only be valid
1.570 + * if the choice mode is not {@link #CHOICE_MODE_NONE} (default).
1.571 + *
1.572 + * <p>To determine the specific items that are currently selected, use one of
1.573 + * the <code>getChecked*</code> methods.
1.574 + *
1.575 + * @return The number of items currently selected
1.576 + *
1.577 + * @see #getCheckedItemPosition()
1.578 + * @see #getCheckedItemPositions()
1.579 + * @see #getCheckedItemIds()
1.580 + */
1.581 + public int getCheckedItemCount() {
1.582 + return mCheckedItemCount;
1.583 + }
1.584 +
1.585 + /**
1.586 + * Returns the checked state of the specified position. The result is only
1.587 + * valid if the choice mode has been set to {@link #CHOICE_MODE_SINGLE}
1.588 + * or {@link #CHOICE_MODE_MULTIPLE}.
1.589 + *
1.590 + * @param position The item whose checked state to return
1.591 + * @return The item's checked state or <code>false</code> if choice mode
1.592 + * is invalid
1.593 + *
1.594 + * @see #setChoiceMode(int)
1.595 + */
1.596 + public boolean isItemChecked(int position) {
1.597 + if (mChoiceMode.compareTo(ChoiceMode.NONE) == 0 && mCheckStates != null) {
1.598 + return mCheckStates.get(position);
1.599 + }
1.600 +
1.601 + return false;
1.602 + }
1.603 +
1.604 + /**
1.605 + * Returns the currently checked item. The result is only valid if the choice
1.606 + * mode has been set to {@link #CHOICE_MODE_SINGLE}.
1.607 + *
1.608 + * @return The position of the currently checked item or
1.609 + * {@link #INVALID_POSITION} if nothing is selected
1.610 + *
1.611 + * @see #setChoiceMode(int)
1.612 + */
1.613 + public int getCheckedItemPosition() {
1.614 + if (mChoiceMode.compareTo(ChoiceMode.SINGLE) == 0 &&
1.615 + mCheckStates != null && mCheckStates.size() == 1) {
1.616 + return mCheckStates.keyAt(0);
1.617 + }
1.618 +
1.619 + return INVALID_POSITION;
1.620 + }
1.621 +
1.622 + /**
1.623 + * Returns the set of checked items in the list. The result is only valid if
1.624 + * the choice mode has not been set to {@link #CHOICE_MODE_NONE}.
1.625 + *
1.626 + * @return A SparseBooleanArray which will return true for each call to
1.627 + * get(int position) where position is a position in the list,
1.628 + * or <code>null</code> if the choice mode is set to
1.629 + * {@link #CHOICE_MODE_NONE}.
1.630 + */
1.631 + public SparseBooleanArray getCheckedItemPositions() {
1.632 + if (mChoiceMode.compareTo(ChoiceMode.NONE) != 0) {
1.633 + return mCheckStates;
1.634 + }
1.635 +
1.636 + return null;
1.637 + }
1.638 +
1.639 + /**
1.640 + * Returns the set of checked items ids. The result is only valid if the
1.641 + * choice mode has not been set to {@link #CHOICE_MODE_NONE} and the adapter
1.642 + * has stable IDs. ({@link ListAdapter#hasStableIds()} == {@code true})
1.643 + *
1.644 + * @return A new array which contains the id of each checked item in the
1.645 + * list.
1.646 + */
1.647 + public long[] getCheckedItemIds() {
1.648 + if (mChoiceMode.compareTo(ChoiceMode.NONE) == 0 ||
1.649 + mCheckedIdStates == null || mAdapter == null) {
1.650 + return new long[0];
1.651 + }
1.652 +
1.653 + final LongSparseArray<Integer> idStates = mCheckedIdStates;
1.654 + final int count = idStates.size();
1.655 + final long[] ids = new long[count];
1.656 +
1.657 + for (int i = 0; i < count; i++) {
1.658 + ids[i] = idStates.keyAt(i);
1.659 + }
1.660 +
1.661 + return ids;
1.662 + }
1.663 +
1.664 + /**
1.665 + * Sets the checked state of the specified position. The is only valid if
1.666 + * the choice mode has been set to {@link #CHOICE_MODE_SINGLE} or
1.667 + * {@link #CHOICE_MODE_MULTIPLE}.
1.668 + *
1.669 + * @param position The item whose checked state is to be checked
1.670 + * @param value The new checked state for the item
1.671 + */
1.672 + public void setItemChecked(int position, boolean value) {
1.673 + if (mChoiceMode.compareTo(ChoiceMode.NONE) == 0) {
1.674 + return;
1.675 + }
1.676 +
1.677 + if (mChoiceMode.compareTo(ChoiceMode.MULTIPLE) == 0) {
1.678 + boolean oldValue = mCheckStates.get(position);
1.679 + mCheckStates.put(position, value);
1.680 +
1.681 + if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
1.682 + if (value) {
1.683 + mCheckedIdStates.put(mAdapter.getItemId(position), position);
1.684 + } else {
1.685 + mCheckedIdStates.delete(mAdapter.getItemId(position));
1.686 + }
1.687 + }
1.688 +
1.689 + if (oldValue != value) {
1.690 + if (value) {
1.691 + mCheckedItemCount++;
1.692 + } else {
1.693 + mCheckedItemCount--;
1.694 + }
1.695 + }
1.696 + } else {
1.697 + boolean updateIds = mCheckedIdStates != null && mAdapter.hasStableIds();
1.698 +
1.699 + // Clear all values if we're checking something, or unchecking the currently
1.700 + // selected item
1.701 + if (value || isItemChecked(position)) {
1.702 + mCheckStates.clear();
1.703 +
1.704 + if (updateIds) {
1.705 + mCheckedIdStates.clear();
1.706 + }
1.707 + }
1.708 +
1.709 + // This may end up selecting the value we just cleared but this way
1.710 + // we ensure length of mCheckStates is 1, a fact getCheckedItemPosition relies on
1.711 + if (value) {
1.712 + mCheckStates.put(position, true);
1.713 +
1.714 + if (updateIds) {
1.715 + mCheckedIdStates.put(mAdapter.getItemId(position), position);
1.716 + }
1.717 +
1.718 + mCheckedItemCount = 1;
1.719 + } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) {
1.720 + mCheckedItemCount = 0;
1.721 + }
1.722 + }
1.723 +
1.724 + // Do not generate a data change while we are in the layout phase
1.725 + if (!mInLayout && !mBlockLayoutRequests) {
1.726 + mDataChanged = true;
1.727 + rememberSyncState();
1.728 + requestLayout();
1.729 + }
1.730 + }
1.731 +
1.732 + /**
1.733 + * Clear any choices previously set
1.734 + */
1.735 + public void clearChoices() {
1.736 + if (mCheckStates != null) {
1.737 + mCheckStates.clear();
1.738 + }
1.739 +
1.740 + if (mCheckedIdStates != null) {
1.741 + mCheckedIdStates.clear();
1.742 + }
1.743 +
1.744 + mCheckedItemCount = 0;
1.745 + }
1.746 +
1.747 + /**
1.748 + * @see #setChoiceMode(int)
1.749 + *
1.750 + * @return The current choice mode
1.751 + */
1.752 + public ChoiceMode getChoiceMode() {
1.753 + return mChoiceMode;
1.754 + }
1.755 +
1.756 + /**
1.757 + * Defines the choice behavior for the List. By default, Lists do not have any choice behavior
1.758 + * ({@link #CHOICE_MODE_NONE}). By setting the choiceMode to {@link #CHOICE_MODE_SINGLE}, the
1.759 + * List allows up to one item to be in a chosen state. By setting the choiceMode to
1.760 + * {@link #CHOICE_MODE_MULTIPLE}, the list allows any number of items to be chosen.
1.761 + *
1.762 + * @param choiceMode One of {@link #CHOICE_MODE_NONE}, {@link #CHOICE_MODE_SINGLE}, or
1.763 + * {@link #CHOICE_MODE_MULTIPLE}
1.764 + */
1.765 + public void setChoiceMode(ChoiceMode choiceMode) {
1.766 + mChoiceMode = choiceMode;
1.767 +
1.768 + if (mChoiceMode.compareTo(ChoiceMode.NONE) != 0) {
1.769 + if (mCheckStates == null) {
1.770 + mCheckStates = new SparseBooleanArray();
1.771 + }
1.772 +
1.773 + if (mCheckedIdStates == null && mAdapter != null && mAdapter.hasStableIds()) {
1.774 + mCheckedIdStates = new LongSparseArray<Integer>();
1.775 + }
1.776 + }
1.777 + }
1.778 +
1.779 + @Override
1.780 + public ListAdapter getAdapter() {
1.781 + return mAdapter;
1.782 + }
1.783 +
1.784 + @Override
1.785 + public void setAdapter(ListAdapter adapter) {
1.786 + if (mAdapter != null && mDataSetObserver != null) {
1.787 + mAdapter.unregisterDataSetObserver(mDataSetObserver);
1.788 + }
1.789 +
1.790 + resetState();
1.791 + mRecycler.clear();
1.792 +
1.793 + mAdapter = adapter;
1.794 + mDataChanged = true;
1.795 +
1.796 + mOldSelectedPosition = INVALID_POSITION;
1.797 + mOldSelectedRowId = INVALID_ROW_ID;
1.798 +
1.799 + if (mCheckStates != null) {
1.800 + mCheckStates.clear();
1.801 + }
1.802 +
1.803 + if (mCheckedIdStates != null) {
1.804 + mCheckedIdStates.clear();
1.805 + }
1.806 +
1.807 + if (mAdapter != null) {
1.808 + mOldItemCount = mItemCount;
1.809 + mItemCount = adapter.getCount();
1.810 +
1.811 + mDataSetObserver = new AdapterDataSetObserver();
1.812 + mAdapter.registerDataSetObserver(mDataSetObserver);
1.813 +
1.814 + mRecycler.setViewTypeCount(adapter.getViewTypeCount());
1.815 +
1.816 + mHasStableIds = adapter.hasStableIds();
1.817 + mAreAllItemsSelectable = adapter.areAllItemsEnabled();
1.818 +
1.819 + if (mChoiceMode.compareTo(ChoiceMode.NONE) != 0 && mHasStableIds &&
1.820 + mCheckedIdStates == null) {
1.821 + mCheckedIdStates = new LongSparseArray<Integer>();
1.822 + }
1.823 +
1.824 + final int position = lookForSelectablePosition(0);
1.825 + setSelectedPositionInt(position);
1.826 + setNextSelectedPositionInt(position);
1.827 +
1.828 + if (mItemCount == 0) {
1.829 + checkSelectionChanged();
1.830 + }
1.831 + } else {
1.832 + mItemCount = 0;
1.833 + mHasStableIds = false;
1.834 + mAreAllItemsSelectable = true;
1.835 +
1.836 + checkSelectionChanged();
1.837 + }
1.838 +
1.839 + checkFocus();
1.840 + requestLayout();
1.841 + }
1.842 +
1.843 + @Override
1.844 + public int getFirstVisiblePosition() {
1.845 + return mFirstPosition;
1.846 + }
1.847 +
1.848 + @Override
1.849 + public int getLastVisiblePosition() {
1.850 + return mFirstPosition + getChildCount() - 1;
1.851 + }
1.852 +
1.853 + @Override
1.854 + public int getCount() {
1.855 + return mItemCount;
1.856 + }
1.857 +
1.858 + @Override
1.859 + public int getPositionForView(View view) {
1.860 + View child = view;
1.861 + try {
1.862 + View v;
1.863 + while (!(v = (View) child.getParent()).equals(this)) {
1.864 + child = v;
1.865 + }
1.866 + } catch (ClassCastException e) {
1.867 + // We made it up to the window without find this list view
1.868 + return INVALID_POSITION;
1.869 + }
1.870 +
1.871 + // Search the children for the list item
1.872 + final int childCount = getChildCount();
1.873 + for (int i = 0; i < childCount; i++) {
1.874 + if (getChildAt(i).equals(child)) {
1.875 + return mFirstPosition + i;
1.876 + }
1.877 + }
1.878 +
1.879 + // Child not found!
1.880 + return INVALID_POSITION;
1.881 + }
1.882 +
1.883 + @Override
1.884 + public void getFocusedRect(Rect r) {
1.885 + View view = getSelectedView();
1.886 +
1.887 + if (view != null && view.getParent() == this) {
1.888 + // The focused rectangle of the selected view offset into the
1.889 + // coordinate space of this view.
1.890 + view.getFocusedRect(r);
1.891 + offsetDescendantRectToMyCoords(view, r);
1.892 + } else {
1.893 + super.getFocusedRect(r);
1.894 + }
1.895 + }
1.896 +
1.897 + @Override
1.898 + protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
1.899 + super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
1.900 +
1.901 + if (gainFocus && mSelectedPosition < 0 && !isInTouchMode()) {
1.902 + if (!mIsAttached && mAdapter != null) {
1.903 + // Data may have changed while we were detached and it's valid
1.904 + // to change focus while detached. Refresh so we don't die.
1.905 + mDataChanged = true;
1.906 + mOldItemCount = mItemCount;
1.907 + mItemCount = mAdapter.getCount();
1.908 + }
1.909 +
1.910 + resurrectSelection();
1.911 + }
1.912 +
1.913 + final ListAdapter adapter = mAdapter;
1.914 + int closetChildIndex = INVALID_POSITION;
1.915 + int closestChildStart = 0;
1.916 +
1.917 + if (adapter != null && gainFocus && previouslyFocusedRect != null) {
1.918 + previouslyFocusedRect.offset(getScrollX(), getScrollY());
1.919 +
1.920 + // Don't cache the result of getChildCount or mFirstPosition here,
1.921 + // it could change in layoutChildren.
1.922 + if (adapter.getCount() < getChildCount() + mFirstPosition) {
1.923 + mLayoutMode = LAYOUT_NORMAL;
1.924 + layoutChildren();
1.925 + }
1.926 +
1.927 + // Figure out which item should be selected based on previously
1.928 + // focused rect.
1.929 + Rect otherRect = mTempRect;
1.930 + int minDistance = Integer.MAX_VALUE;
1.931 + final int childCount = getChildCount();
1.932 + final int firstPosition = mFirstPosition;
1.933 +
1.934 + for (int i = 0; i < childCount; i++) {
1.935 + // Only consider selectable views
1.936 + if (!adapter.isEnabled(firstPosition + i)) {
1.937 + continue;
1.938 + }
1.939 +
1.940 + View other = getChildAt(i);
1.941 + other.getDrawingRect(otherRect);
1.942 + offsetDescendantRectToMyCoords(other, otherRect);
1.943 + int distance = getDistance(previouslyFocusedRect, otherRect, direction);
1.944 +
1.945 + if (distance < minDistance) {
1.946 + minDistance = distance;
1.947 + closetChildIndex = i;
1.948 + closestChildStart = (mIsVertical ? other.getTop() : other.getLeft());
1.949 + }
1.950 + }
1.951 + }
1.952 +
1.953 + if (closetChildIndex >= 0) {
1.954 + setSelectionFromOffset(closetChildIndex + mFirstPosition, closestChildStart);
1.955 + } else {
1.956 + requestLayout();
1.957 + }
1.958 + }
1.959 +
1.960 + @Override
1.961 + protected void onAttachedToWindow() {
1.962 + super.onAttachedToWindow();
1.963 +
1.964 + final ViewTreeObserver treeObserver = getViewTreeObserver();
1.965 + treeObserver.addOnTouchModeChangeListener(this);
1.966 +
1.967 + if (mAdapter != null && mDataSetObserver == null) {
1.968 + mDataSetObserver = new AdapterDataSetObserver();
1.969 + mAdapter.registerDataSetObserver(mDataSetObserver);
1.970 +
1.971 + // Data may have changed while we were detached. Refresh.
1.972 + mDataChanged = true;
1.973 + mOldItemCount = mItemCount;
1.974 + mItemCount = mAdapter.getCount();
1.975 + }
1.976 +
1.977 + mIsAttached = true;
1.978 + }
1.979 +
1.980 + @Override
1.981 + protected void onDetachedFromWindow() {
1.982 + super.onDetachedFromWindow();
1.983 +
1.984 + // Detach any view left in the scrap heap
1.985 + mRecycler.clear();
1.986 +
1.987 + final ViewTreeObserver treeObserver = getViewTreeObserver();
1.988 + treeObserver.removeOnTouchModeChangeListener(this);
1.989 +
1.990 + if (mAdapter != null) {
1.991 + mAdapter.unregisterDataSetObserver(mDataSetObserver);
1.992 + mDataSetObserver = null;
1.993 + }
1.994 +
1.995 + if (mPerformClick != null) {
1.996 + removeCallbacks(mPerformClick);
1.997 + }
1.998 +
1.999 + if (mTouchModeReset != null) {
1.1000 + removeCallbacks(mTouchModeReset);
1.1001 + mTouchModeReset.run();
1.1002 + }
1.1003 +
1.1004 + mIsAttached = false;
1.1005 + }
1.1006 +
1.1007 + @Override
1.1008 + public void onWindowFocusChanged(boolean hasWindowFocus) {
1.1009 + super.onWindowFocusChanged(hasWindowFocus);
1.1010 +
1.1011 + final int touchMode = isInTouchMode() ? TOUCH_MODE_ON : TOUCH_MODE_OFF;
1.1012 +
1.1013 + if (!hasWindowFocus) {
1.1014 + if (touchMode == TOUCH_MODE_OFF) {
1.1015 + // Remember the last selected element
1.1016 + mResurrectToPosition = mSelectedPosition;
1.1017 + }
1.1018 + } else {
1.1019 + // If we changed touch mode since the last time we had focus
1.1020 + if (touchMode != mLastTouchMode && mLastTouchMode != TOUCH_MODE_UNKNOWN) {
1.1021 + // If we come back in trackball mode, we bring the selection back
1.1022 + if (touchMode == TOUCH_MODE_OFF) {
1.1023 + // This will trigger a layout
1.1024 + resurrectSelection();
1.1025 +
1.1026 + // If we come back in touch mode, then we want to hide the selector
1.1027 + } else {
1.1028 + hideSelector();
1.1029 + mLayoutMode = LAYOUT_NORMAL;
1.1030 + layoutChildren();
1.1031 + }
1.1032 + }
1.1033 + }
1.1034 +
1.1035 + mLastTouchMode = touchMode;
1.1036 + }
1.1037 +
1.1038 + @Override
1.1039 + protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
1.1040 + boolean needsInvalidate = false;
1.1041 +
1.1042 + if (mIsVertical && mOverScroll != scrollY) {
1.1043 + onScrollChanged(getScrollX(), scrollY, getScrollX(), mOverScroll);
1.1044 + mOverScroll = scrollY;
1.1045 + needsInvalidate = true;
1.1046 + } else if (!mIsVertical && mOverScroll != scrollX) {
1.1047 + onScrollChanged(scrollX, getScrollY(), mOverScroll, getScrollY());
1.1048 + mOverScroll = scrollX;
1.1049 + needsInvalidate = true;
1.1050 + }
1.1051 +
1.1052 + if (needsInvalidate) {
1.1053 + invalidate();
1.1054 + awakenScrollbarsInternal();
1.1055 + }
1.1056 + }
1.1057 +
1.1058 + @TargetApi(9)
1.1059 + private boolean overScrollByInternal(int deltaX, int deltaY,
1.1060 + int scrollX, int scrollY,
1.1061 + int scrollRangeX, int scrollRangeY,
1.1062 + int maxOverScrollX, int maxOverScrollY,
1.1063 + boolean isTouchEvent) {
1.1064 + if (Build.VERSION.SDK_INT < 9) {
1.1065 + return false;
1.1066 + }
1.1067 +
1.1068 + return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
1.1069 + scrollRangeY, maxOverScrollX, maxOverScrollY, isTouchEvent);
1.1070 + }
1.1071 +
1.1072 + @Override
1.1073 + @TargetApi(9)
1.1074 + public void setOverScrollMode(int mode) {
1.1075 + if (Build.VERSION.SDK_INT < 9) {
1.1076 + return;
1.1077 + }
1.1078 +
1.1079 + if (mode != ViewCompat.OVER_SCROLL_NEVER) {
1.1080 + if (mStartEdge == null) {
1.1081 + Context context = getContext();
1.1082 +
1.1083 + mStartEdge = new EdgeEffectCompat(context);
1.1084 + mEndEdge = new EdgeEffectCompat(context);
1.1085 + }
1.1086 + } else {
1.1087 + mStartEdge = null;
1.1088 + mEndEdge = null;
1.1089 + }
1.1090 +
1.1091 + super.setOverScrollMode(mode);
1.1092 + }
1.1093 +
1.1094 + public int pointToPosition(int x, int y) {
1.1095 + Rect frame = mTouchFrame;
1.1096 + if (frame == null) {
1.1097 + mTouchFrame = new Rect();
1.1098 + frame = mTouchFrame;
1.1099 + }
1.1100 +
1.1101 + final int count = getChildCount();
1.1102 + for (int i = count - 1; i >= 0; i--) {
1.1103 + final View child = getChildAt(i);
1.1104 +
1.1105 + if (child.getVisibility() == View.VISIBLE) {
1.1106 + child.getHitRect(frame);
1.1107 +
1.1108 + if (frame.contains(x, y)) {
1.1109 + return mFirstPosition + i;
1.1110 + }
1.1111 + }
1.1112 + }
1.1113 + return INVALID_POSITION;
1.1114 + }
1.1115 +
1.1116 + @Override
1.1117 + protected int computeVerticalScrollExtent() {
1.1118 + final int count = getChildCount();
1.1119 + if (count == 0) {
1.1120 + return 0;
1.1121 + }
1.1122 +
1.1123 + int extent = count * 100;
1.1124 +
1.1125 + View child = getChildAt(0);
1.1126 + final int childTop = child.getTop();
1.1127 +
1.1128 + int childHeight = child.getHeight();
1.1129 + if (childHeight > 0) {
1.1130 + extent += (childTop * 100) / childHeight;
1.1131 + }
1.1132 +
1.1133 + child = getChildAt(count - 1);
1.1134 + final int childBottom = child.getBottom();
1.1135 +
1.1136 + childHeight = child.getHeight();
1.1137 + if (childHeight > 0) {
1.1138 + extent -= ((childBottom - getHeight()) * 100) / childHeight;
1.1139 + }
1.1140 +
1.1141 + return extent;
1.1142 + }
1.1143 +
1.1144 + @Override
1.1145 + protected int computeHorizontalScrollExtent() {
1.1146 + final int count = getChildCount();
1.1147 + if (count == 0) {
1.1148 + return 0;
1.1149 + }
1.1150 +
1.1151 + int extent = count * 100;
1.1152 +
1.1153 + View child = getChildAt(0);
1.1154 + final int childLeft = child.getLeft();
1.1155 +
1.1156 + int childWidth = child.getWidth();
1.1157 + if (childWidth > 0) {
1.1158 + extent += (childLeft * 100) / childWidth;
1.1159 + }
1.1160 +
1.1161 + child = getChildAt(count - 1);
1.1162 + final int childRight = child.getRight();
1.1163 +
1.1164 + childWidth = child.getWidth();
1.1165 + if (childWidth > 0) {
1.1166 + extent -= ((childRight - getWidth()) * 100) / childWidth;
1.1167 + }
1.1168 +
1.1169 + return extent;
1.1170 + }
1.1171 +
1.1172 + @Override
1.1173 + protected int computeVerticalScrollOffset() {
1.1174 + final int firstPosition = mFirstPosition;
1.1175 + final int childCount = getChildCount();
1.1176 +
1.1177 + if (firstPosition < 0 || childCount == 0) {
1.1178 + return 0;
1.1179 + }
1.1180 +
1.1181 + final View child = getChildAt(0);
1.1182 + final int childTop = child.getTop();
1.1183 +
1.1184 + int childHeight = child.getHeight();
1.1185 + if (childHeight > 0) {
1.1186 + return Math.max(firstPosition * 100 - (childTop * 100) / childHeight, 0);
1.1187 + }
1.1188 +
1.1189 + return 0;
1.1190 + }
1.1191 +
1.1192 + @Override
1.1193 + protected int computeHorizontalScrollOffset() {
1.1194 + final int firstPosition = mFirstPosition;
1.1195 + final int childCount = getChildCount();
1.1196 +
1.1197 + if (firstPosition < 0 || childCount == 0) {
1.1198 + return 0;
1.1199 + }
1.1200 +
1.1201 + final View child = getChildAt(0);
1.1202 + final int childLeft = child.getLeft();
1.1203 +
1.1204 + int childWidth = child.getWidth();
1.1205 + if (childWidth > 0) {
1.1206 + return Math.max(firstPosition * 100 - (childLeft * 100) / childWidth, 0);
1.1207 + }
1.1208 +
1.1209 + return 0;
1.1210 + }
1.1211 +
1.1212 + @Override
1.1213 + protected int computeVerticalScrollRange() {
1.1214 + int result = Math.max(mItemCount * 100, 0);
1.1215 +
1.1216 + if (mIsVertical && mOverScroll != 0) {
1.1217 + // Compensate for overscroll
1.1218 + result += Math.abs((int) ((float) mOverScroll / getHeight() * mItemCount * 100));
1.1219 + }
1.1220 +
1.1221 + return result;
1.1222 + }
1.1223 +
1.1224 + @Override
1.1225 + protected int computeHorizontalScrollRange() {
1.1226 + int result = Math.max(mItemCount * 100, 0);
1.1227 +
1.1228 + if (!mIsVertical && mOverScroll != 0) {
1.1229 + // Compensate for overscroll
1.1230 + result += Math.abs((int) ((float) mOverScroll / getWidth() * mItemCount * 100));
1.1231 + }
1.1232 +
1.1233 + return result;
1.1234 + }
1.1235 +
1.1236 + @Override
1.1237 + public boolean showContextMenuForChild(View originalView) {
1.1238 + final int longPressPosition = getPositionForView(originalView);
1.1239 + if (longPressPosition >= 0) {
1.1240 + final long longPressId = mAdapter.getItemId(longPressPosition);
1.1241 + boolean handled = false;
1.1242 +
1.1243 + OnItemLongClickListener listener = getOnItemLongClickListener();
1.1244 + if (listener != null) {
1.1245 + handled = listener.onItemLongClick(TwoWayView.this, originalView,
1.1246 + longPressPosition, longPressId);
1.1247 + }
1.1248 +
1.1249 + if (!handled) {
1.1250 + mContextMenuInfo = createContextMenuInfo(
1.1251 + getChildAt(longPressPosition - mFirstPosition),
1.1252 + longPressPosition, longPressId);
1.1253 +
1.1254 + handled = super.showContextMenuForChild(originalView);
1.1255 + }
1.1256 +
1.1257 + return handled;
1.1258 + }
1.1259 +
1.1260 + return false;
1.1261 + }
1.1262 +
1.1263 + @Override
1.1264 + public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
1.1265 + if (disallowIntercept) {
1.1266 + recycleVelocityTracker();
1.1267 + }
1.1268 +
1.1269 + super.requestDisallowInterceptTouchEvent(disallowIntercept);
1.1270 + }
1.1271 +
1.1272 + @Override
1.1273 + public boolean onInterceptTouchEvent(MotionEvent ev) {
1.1274 + if (!mIsAttached) {
1.1275 + return false;
1.1276 + }
1.1277 +
1.1278 + final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
1.1279 + switch (action) {
1.1280 + case MotionEvent.ACTION_DOWN:
1.1281 + initOrResetVelocityTracker();
1.1282 + mVelocityTracker.addMovement(ev);
1.1283 +
1.1284 + mScroller.abortAnimation();
1.1285 +
1.1286 + final float x = ev.getX();
1.1287 + final float y = ev.getY();
1.1288 +
1.1289 + mLastTouchPos = (mIsVertical ? y : x);
1.1290 +
1.1291 + final int motionPosition = findMotionRowOrColumn((int) mLastTouchPos);
1.1292 +
1.1293 + mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
1.1294 + mTouchRemainderPos = 0;
1.1295 +
1.1296 + if (mTouchMode == TOUCH_MODE_FLINGING) {
1.1297 + return true;
1.1298 + } else if (motionPosition >= 0) {
1.1299 + mMotionPosition = motionPosition;
1.1300 + mTouchMode = TOUCH_MODE_DOWN;
1.1301 + }
1.1302 +
1.1303 + break;
1.1304 +
1.1305 + case MotionEvent.ACTION_MOVE: {
1.1306 + if (mTouchMode != TOUCH_MODE_DOWN) {
1.1307 + break;
1.1308 + }
1.1309 +
1.1310 + initVelocityTrackerIfNotExists();
1.1311 + mVelocityTracker.addMovement(ev);
1.1312 +
1.1313 + final int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
1.1314 + if (index < 0) {
1.1315 + Log.e(LOGTAG, "onInterceptTouchEvent could not find pointer with id " +
1.1316 + mActivePointerId + " - did TwoWayView receive an inconsistent " +
1.1317 + "event stream?");
1.1318 + return false;
1.1319 + }
1.1320 +
1.1321 + final float pos;
1.1322 + if (mIsVertical) {
1.1323 + pos = MotionEventCompat.getY(ev, index);
1.1324 + } else {
1.1325 + pos = MotionEventCompat.getX(ev, index);
1.1326 + }
1.1327 +
1.1328 + final float diff = pos - mLastTouchPos + mTouchRemainderPos;
1.1329 + final int delta = (int) diff;
1.1330 + mTouchRemainderPos = diff - delta;
1.1331 +
1.1332 + if (maybeStartScrolling(delta)) {
1.1333 + return true;
1.1334 + }
1.1335 +
1.1336 + break;
1.1337 + }
1.1338 +
1.1339 + case MotionEvent.ACTION_CANCEL:
1.1340 + case MotionEvent.ACTION_UP:
1.1341 + mActivePointerId = INVALID_POINTER;
1.1342 + mTouchMode = TOUCH_MODE_REST;
1.1343 + recycleVelocityTracker();
1.1344 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.1345 +
1.1346 + break;
1.1347 + }
1.1348 +
1.1349 + return false;
1.1350 + }
1.1351 +
1.1352 + @Override
1.1353 + public boolean onTouchEvent(MotionEvent ev) {
1.1354 + if (!isEnabled()) {
1.1355 + // A disabled view that is clickable still consumes the touch
1.1356 + // events, it just doesn't respond to them.
1.1357 + return isClickable() || isLongClickable();
1.1358 + }
1.1359 +
1.1360 + if (!mIsAttached) {
1.1361 + return false;
1.1362 + }
1.1363 +
1.1364 + boolean needsInvalidate = false;
1.1365 +
1.1366 + initVelocityTrackerIfNotExists();
1.1367 + mVelocityTracker.addMovement(ev);
1.1368 +
1.1369 + final int action = ev.getAction() & MotionEventCompat.ACTION_MASK;
1.1370 + switch (action) {
1.1371 + case MotionEvent.ACTION_DOWN: {
1.1372 + if (mDataChanged) {
1.1373 + break;
1.1374 + }
1.1375 +
1.1376 + mVelocityTracker.clear();
1.1377 + mScroller.abortAnimation();
1.1378 +
1.1379 + final float x = ev.getX();
1.1380 + final float y = ev.getY();
1.1381 +
1.1382 + mLastTouchPos = (mIsVertical ? y : x);
1.1383 +
1.1384 + int motionPosition = pointToPosition((int) x, (int) y);
1.1385 +
1.1386 + mActivePointerId = MotionEventCompat.getPointerId(ev, 0);
1.1387 + mTouchRemainderPos = 0;
1.1388 +
1.1389 + if (mDataChanged) {
1.1390 + break;
1.1391 + }
1.1392 +
1.1393 + if (mTouchMode == TOUCH_MODE_FLINGING) {
1.1394 + mTouchMode = TOUCH_MODE_DRAGGING;
1.1395 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
1.1396 + motionPosition = findMotionRowOrColumn((int) mLastTouchPos);
1.1397 + return true;
1.1398 + } else if (mMotionPosition >= 0 && mAdapter.isEnabled(mMotionPosition)) {
1.1399 + mTouchMode = TOUCH_MODE_DOWN;
1.1400 + triggerCheckForTap();
1.1401 + }
1.1402 +
1.1403 + mMotionPosition = motionPosition;
1.1404 +
1.1405 + break;
1.1406 + }
1.1407 +
1.1408 + case MotionEvent.ACTION_MOVE: {
1.1409 + final int index = MotionEventCompat.findPointerIndex(ev, mActivePointerId);
1.1410 + if (index < 0) {
1.1411 + Log.e(LOGTAG, "onInterceptTouchEvent could not find pointer with id " +
1.1412 + mActivePointerId + " - did TwoWayView receive an inconsistent " +
1.1413 + "event stream?");
1.1414 + return false;
1.1415 + }
1.1416 +
1.1417 + final float pos;
1.1418 + if (mIsVertical) {
1.1419 + pos = MotionEventCompat.getY(ev, index);
1.1420 + } else {
1.1421 + pos = MotionEventCompat.getX(ev, index);
1.1422 + }
1.1423 +
1.1424 + if (mDataChanged) {
1.1425 + // Re-sync everything if data has been changed
1.1426 + // since the scroll operation can query the adapter.
1.1427 + layoutChildren();
1.1428 + }
1.1429 +
1.1430 + final float diff = pos - mLastTouchPos + mTouchRemainderPos;
1.1431 + final int delta = (int) diff;
1.1432 + mTouchRemainderPos = diff - delta;
1.1433 +
1.1434 + switch (mTouchMode) {
1.1435 + case TOUCH_MODE_DOWN:
1.1436 + case TOUCH_MODE_TAP:
1.1437 + case TOUCH_MODE_DONE_WAITING:
1.1438 + // Check if we have moved far enough that it looks more like a
1.1439 + // scroll than a tap
1.1440 + maybeStartScrolling(delta);
1.1441 + break;
1.1442 +
1.1443 + case TOUCH_MODE_DRAGGING:
1.1444 + case TOUCH_MODE_OVERSCROLL:
1.1445 + mLastTouchPos = pos;
1.1446 + maybeScroll(delta);
1.1447 + break;
1.1448 + }
1.1449 +
1.1450 + break;
1.1451 + }
1.1452 +
1.1453 + case MotionEvent.ACTION_CANCEL:
1.1454 + cancelCheckForTap();
1.1455 + mTouchMode = TOUCH_MODE_REST;
1.1456 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.1457 +
1.1458 + setPressed(false);
1.1459 + View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
1.1460 + if (motionView != null) {
1.1461 + motionView.setPressed(false);
1.1462 + }
1.1463 +
1.1464 + if (mStartEdge != null && mEndEdge != null) {
1.1465 + needsInvalidate = mStartEdge.onRelease() | mEndEdge.onRelease();
1.1466 + }
1.1467 +
1.1468 + recycleVelocityTracker();
1.1469 +
1.1470 + break;
1.1471 +
1.1472 + case MotionEvent.ACTION_UP: {
1.1473 + switch (mTouchMode) {
1.1474 + case TOUCH_MODE_DOWN:
1.1475 + case TOUCH_MODE_TAP:
1.1476 + case TOUCH_MODE_DONE_WAITING: {
1.1477 + final int motionPosition = mMotionPosition;
1.1478 + final View child = getChildAt(motionPosition - mFirstPosition);
1.1479 +
1.1480 + final float x = ev.getX();
1.1481 + final float y = ev.getY();
1.1482 +
1.1483 + boolean inList = false;
1.1484 + if (mIsVertical) {
1.1485 + inList = x > getPaddingLeft() && x < getWidth() - getPaddingRight();
1.1486 + } else {
1.1487 + inList = y > getPaddingTop() && y < getHeight() - getPaddingBottom();
1.1488 + }
1.1489 +
1.1490 + if (child != null && !child.hasFocusable() && inList) {
1.1491 + if (mTouchMode != TOUCH_MODE_DOWN) {
1.1492 + child.setPressed(false);
1.1493 + }
1.1494 +
1.1495 + if (mPerformClick == null) {
1.1496 + mPerformClick = new PerformClick();
1.1497 + }
1.1498 +
1.1499 + final PerformClick performClick = mPerformClick;
1.1500 + performClick.mClickMotionPosition = motionPosition;
1.1501 + performClick.rememberWindowAttachCount();
1.1502 +
1.1503 + mResurrectToPosition = motionPosition;
1.1504 +
1.1505 + if (mTouchMode == TOUCH_MODE_DOWN || mTouchMode == TOUCH_MODE_TAP) {
1.1506 + if (mTouchMode == TOUCH_MODE_DOWN) {
1.1507 + cancelCheckForTap();
1.1508 + } else {
1.1509 + cancelCheckForLongPress();
1.1510 + }
1.1511 +
1.1512 + mLayoutMode = LAYOUT_NORMAL;
1.1513 +
1.1514 + if (!mDataChanged && mAdapter.isEnabled(motionPosition)) {
1.1515 + mTouchMode = TOUCH_MODE_TAP;
1.1516 +
1.1517 + setPressed(true);
1.1518 + positionSelector(mMotionPosition, child);
1.1519 + child.setPressed(true);
1.1520 +
1.1521 + if (mSelector != null) {
1.1522 + Drawable d = mSelector.getCurrent();
1.1523 + if (d != null && d instanceof TransitionDrawable) {
1.1524 + ((TransitionDrawable) d).resetTransition();
1.1525 + }
1.1526 + }
1.1527 +
1.1528 + if (mTouchModeReset != null) {
1.1529 + removeCallbacks(mTouchModeReset);
1.1530 + }
1.1531 +
1.1532 + mTouchModeReset = new Runnable() {
1.1533 + @Override
1.1534 + public void run() {
1.1535 + mTouchMode = TOUCH_MODE_REST;
1.1536 +
1.1537 + setPressed(false);
1.1538 + child.setPressed(false);
1.1539 +
1.1540 + if (!mDataChanged) {
1.1541 + performClick.run();
1.1542 + }
1.1543 +
1.1544 + mTouchModeReset = null;
1.1545 + }
1.1546 + };
1.1547 +
1.1548 + postDelayed(mTouchModeReset,
1.1549 + ViewConfiguration.getPressedStateDuration());
1.1550 + } else {
1.1551 + mTouchMode = TOUCH_MODE_REST;
1.1552 + updateSelectorState();
1.1553 + }
1.1554 + } else if (!mDataChanged && mAdapter.isEnabled(motionPosition)) {
1.1555 + performClick.run();
1.1556 + }
1.1557 + }
1.1558 +
1.1559 + mTouchMode = TOUCH_MODE_REST;
1.1560 + updateSelectorState();
1.1561 +
1.1562 + break;
1.1563 + }
1.1564 +
1.1565 + case TOUCH_MODE_DRAGGING:
1.1566 + if (contentFits()) {
1.1567 + mTouchMode = TOUCH_MODE_REST;
1.1568 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.1569 + break;
1.1570 + }
1.1571 +
1.1572 + mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity);
1.1573 +
1.1574 + final float velocity;
1.1575 + if (mIsVertical) {
1.1576 + velocity = VelocityTrackerCompat.getYVelocity(mVelocityTracker,
1.1577 + mActivePointerId);
1.1578 + } else {
1.1579 + velocity = VelocityTrackerCompat.getXVelocity(mVelocityTracker,
1.1580 + mActivePointerId);
1.1581 + }
1.1582 +
1.1583 + if (Math.abs(velocity) >= mFlingVelocity) {
1.1584 + mTouchMode = TOUCH_MODE_FLINGING;
1.1585 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_FLING);
1.1586 +
1.1587 + mScroller.fling(0, 0,
1.1588 + (int) (mIsVertical ? 0 : velocity),
1.1589 + (int) (mIsVertical ? velocity : 0),
1.1590 + (mIsVertical ? 0 : Integer.MIN_VALUE),
1.1591 + (mIsVertical ? 0 : Integer.MAX_VALUE),
1.1592 + (mIsVertical ? Integer.MIN_VALUE : 0),
1.1593 + (mIsVertical ? Integer.MAX_VALUE : 0));
1.1594 +
1.1595 + mLastTouchPos = 0;
1.1596 + needsInvalidate = true;
1.1597 + } else {
1.1598 + mTouchMode = TOUCH_MODE_REST;
1.1599 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.1600 + }
1.1601 +
1.1602 + break;
1.1603 +
1.1604 + case TOUCH_MODE_OVERSCROLL:
1.1605 + mTouchMode = TOUCH_MODE_REST;
1.1606 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.1607 + break;
1.1608 + }
1.1609 +
1.1610 + cancelCheckForTap();
1.1611 + cancelCheckForLongPress();
1.1612 + setPressed(false);
1.1613 +
1.1614 + if (mStartEdge != null && mEndEdge != null) {
1.1615 + needsInvalidate |= mStartEdge.onRelease() | mEndEdge.onRelease();
1.1616 + }
1.1617 +
1.1618 + recycleVelocityTracker();
1.1619 +
1.1620 + break;
1.1621 + }
1.1622 + }
1.1623 +
1.1624 + if (needsInvalidate) {
1.1625 + ViewCompat.postInvalidateOnAnimation(this);
1.1626 + }
1.1627 +
1.1628 + return true;
1.1629 + }
1.1630 +
1.1631 + @Override
1.1632 + public void onTouchModeChanged(boolean isInTouchMode) {
1.1633 + if (isInTouchMode) {
1.1634 + // Get rid of the selection when we enter touch mode
1.1635 + hideSelector();
1.1636 +
1.1637 + // Layout, but only if we already have done so previously.
1.1638 + // (Otherwise may clobber a LAYOUT_SYNC layout that was requested to restore
1.1639 + // state.)
1.1640 + if (getWidth() > 0 && getHeight() > 0 && getChildCount() > 0) {
1.1641 + layoutChildren();
1.1642 + }
1.1643 +
1.1644 + updateSelectorState();
1.1645 + } else {
1.1646 + final int touchMode = mTouchMode;
1.1647 + if (touchMode == TOUCH_MODE_OVERSCROLL) {
1.1648 + if (mOverScroll != 0) {
1.1649 + mOverScroll = 0;
1.1650 + finishEdgeGlows();
1.1651 + invalidate();
1.1652 + }
1.1653 + }
1.1654 + }
1.1655 + }
1.1656 +
1.1657 + @Override
1.1658 + public boolean onKeyDown(int keyCode, KeyEvent event) {
1.1659 + return handleKeyEvent(keyCode, 1, event);
1.1660 + }
1.1661 +
1.1662 + @Override
1.1663 + public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
1.1664 + return handleKeyEvent(keyCode, repeatCount, event);
1.1665 + }
1.1666 +
1.1667 + @Override
1.1668 + public boolean onKeyUp(int keyCode, KeyEvent event) {
1.1669 + return handleKeyEvent(keyCode, 1, event);
1.1670 + }
1.1671 +
1.1672 + @Override
1.1673 + public void sendAccessibilityEvent(int eventType) {
1.1674 + // Since this class calls onScrollChanged even if the mFirstPosition and the
1.1675 + // child count have not changed we will avoid sending duplicate accessibility
1.1676 + // events.
1.1677 + if (eventType == AccessibilityEvent.TYPE_VIEW_SCROLLED) {
1.1678 + final int firstVisiblePosition = getFirstVisiblePosition();
1.1679 + final int lastVisiblePosition = getLastVisiblePosition();
1.1680 +
1.1681 + if (mLastAccessibilityScrollEventFromIndex == firstVisiblePosition
1.1682 + && mLastAccessibilityScrollEventToIndex == lastVisiblePosition) {
1.1683 + return;
1.1684 + } else {
1.1685 + mLastAccessibilityScrollEventFromIndex = firstVisiblePosition;
1.1686 + mLastAccessibilityScrollEventToIndex = lastVisiblePosition;
1.1687 + }
1.1688 + }
1.1689 +
1.1690 + super.sendAccessibilityEvent(eventType);
1.1691 + }
1.1692 +
1.1693 + @Override
1.1694 + @TargetApi(14)
1.1695 + public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
1.1696 + super.onInitializeAccessibilityEvent(event);
1.1697 + event.setClassName(TwoWayView.class.getName());
1.1698 + }
1.1699 +
1.1700 + @Override
1.1701 + @TargetApi(14)
1.1702 + public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
1.1703 + super.onInitializeAccessibilityNodeInfo(info);
1.1704 + info.setClassName(TwoWayView.class.getName());
1.1705 +
1.1706 + AccessibilityNodeInfoCompat infoCompat = new AccessibilityNodeInfoCompat(info);
1.1707 +
1.1708 + if (isEnabled()) {
1.1709 + if (getFirstVisiblePosition() > 0) {
1.1710 + infoCompat.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD);
1.1711 + }
1.1712 +
1.1713 + if (getLastVisiblePosition() < getCount() - 1) {
1.1714 + infoCompat.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD);
1.1715 + }
1.1716 + }
1.1717 + }
1.1718 +
1.1719 + @Override
1.1720 + @TargetApi(16)
1.1721 + public boolean performAccessibilityAction(int action, Bundle arguments) {
1.1722 + if (super.performAccessibilityAction(action, arguments)) {
1.1723 + return true;
1.1724 + }
1.1725 +
1.1726 + switch (action) {
1.1727 + case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD:
1.1728 + if (isEnabled() && getLastVisiblePosition() < getCount() - 1) {
1.1729 + final int viewportSize;
1.1730 + if (mIsVertical) {
1.1731 + viewportSize = getHeight() - getPaddingTop() - getPaddingBottom();
1.1732 + } else {
1.1733 + viewportSize = getWidth() - getPaddingLeft() - getPaddingRight();
1.1734 + }
1.1735 +
1.1736 + // TODO: Use some form of smooth scroll instead
1.1737 + trackMotionScroll(viewportSize);
1.1738 + return true;
1.1739 + }
1.1740 + return false;
1.1741 +
1.1742 + case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD:
1.1743 + if (isEnabled() && mFirstPosition > 0) {
1.1744 + final int viewportSize;
1.1745 + if (mIsVertical) {
1.1746 + viewportSize = getHeight() - getPaddingTop() - getPaddingBottom();
1.1747 + } else {
1.1748 + viewportSize = getWidth() - getPaddingLeft() - getPaddingRight();
1.1749 + }
1.1750 +
1.1751 + // TODO: Use some form of smooth scroll instead
1.1752 + trackMotionScroll(-viewportSize);
1.1753 + return true;
1.1754 + }
1.1755 + return false;
1.1756 + }
1.1757 +
1.1758 + return false;
1.1759 + }
1.1760 +
1.1761 + /**
1.1762 + * Return true if child is an ancestor of parent, (or equal to the parent).
1.1763 + */
1.1764 + private boolean isViewAncestorOf(View child, View parent) {
1.1765 + if (child == parent) {
1.1766 + return true;
1.1767 + }
1.1768 +
1.1769 + final ViewParent theParent = child.getParent();
1.1770 +
1.1771 + return (theParent instanceof ViewGroup) &&
1.1772 + isViewAncestorOf((View) theParent, parent);
1.1773 + }
1.1774 +
1.1775 + private void forceValidFocusDirection(int direction) {
1.1776 + if (mIsVertical && direction != View.FOCUS_UP && direction != View.FOCUS_DOWN) {
1.1777 + throw new IllegalArgumentException("Focus direction must be one of"
1.1778 + + " {View.FOCUS_UP, View.FOCUS_DOWN} for vertical orientation");
1.1779 + } else if (!mIsVertical && direction != View.FOCUS_LEFT && direction != View.FOCUS_RIGHT) {
1.1780 + throw new IllegalArgumentException("Focus direction must be one of"
1.1781 + + " {View.FOCUS_LEFT, View.FOCUS_RIGHT} for vertical orientation");
1.1782 + }
1.1783 + }
1.1784 +
1.1785 + private void forceValidInnerFocusDirection(int direction) {
1.1786 + if (mIsVertical && direction != View.FOCUS_LEFT && direction != View.FOCUS_RIGHT) {
1.1787 + throw new IllegalArgumentException("Direction must be one of"
1.1788 + + " {View.FOCUS_LEFT, View.FOCUS_RIGHT} for vertical orientation");
1.1789 + } else if (!mIsVertical && direction != View.FOCUS_UP && direction != View.FOCUS_DOWN) {
1.1790 + throw new IllegalArgumentException("direction must be one of"
1.1791 + + " {View.FOCUS_UP, View.FOCUS_DOWN} for horizontal orientation");
1.1792 + }
1.1793 + }
1.1794 +
1.1795 + /**
1.1796 + * Scrolls up or down by the number of items currently present on screen.
1.1797 + *
1.1798 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.1799 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.1800 + * current view orientation.
1.1801 + *
1.1802 + * @return whether selection was moved
1.1803 + */
1.1804 + boolean pageScroll(int direction) {
1.1805 + forceValidFocusDirection(direction);
1.1806 +
1.1807 + boolean forward = false;
1.1808 + int nextPage = -1;
1.1809 +
1.1810 + if (direction == View.FOCUS_UP || direction == View.FOCUS_LEFT) {
1.1811 + nextPage = Math.max(0, mSelectedPosition - getChildCount() - 1);
1.1812 + } else if (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT) {
1.1813 + nextPage = Math.min(mItemCount - 1, mSelectedPosition + getChildCount() - 1);
1.1814 + forward = true;
1.1815 + }
1.1816 +
1.1817 + if (nextPage < 0) {
1.1818 + return false;
1.1819 + }
1.1820 +
1.1821 + final int position = lookForSelectablePosition(nextPage, forward);
1.1822 + if (position >= 0) {
1.1823 + mLayoutMode = LAYOUT_SPECIFIC;
1.1824 + mSpecificStart = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.1825 +
1.1826 + if (forward && position > mItemCount - getChildCount()) {
1.1827 + mLayoutMode = LAYOUT_FORCE_BOTTOM;
1.1828 + }
1.1829 +
1.1830 + if (!forward && position < getChildCount()) {
1.1831 + mLayoutMode = LAYOUT_FORCE_TOP;
1.1832 + }
1.1833 +
1.1834 + setSelectionInt(position);
1.1835 + invokeOnItemScrollListener();
1.1836 +
1.1837 + if (!awakenScrollbarsInternal()) {
1.1838 + invalidate();
1.1839 + }
1.1840 +
1.1841 + return true;
1.1842 + }
1.1843 +
1.1844 + return false;
1.1845 + }
1.1846 +
1.1847 + /**
1.1848 + * Go to the last or first item if possible (not worrying about panning across or navigating
1.1849 + * within the internal focus of the currently selected item.)
1.1850 + *
1.1851 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.1852 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.1853 + * current view orientation.
1.1854 + *
1.1855 + * @return whether selection was moved
1.1856 + */
1.1857 + boolean fullScroll(int direction) {
1.1858 + forceValidFocusDirection(direction);
1.1859 +
1.1860 + boolean moved = false;
1.1861 + if (direction == View.FOCUS_UP || direction == View.FOCUS_LEFT) {
1.1862 + if (mSelectedPosition != 0) {
1.1863 + int position = lookForSelectablePosition(0, true);
1.1864 + if (position >= 0) {
1.1865 + mLayoutMode = LAYOUT_FORCE_TOP;
1.1866 + setSelectionInt(position);
1.1867 + invokeOnItemScrollListener();
1.1868 + }
1.1869 +
1.1870 + moved = true;
1.1871 + }
1.1872 + } else if (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT) {
1.1873 + if (mSelectedPosition < mItemCount - 1) {
1.1874 + int position = lookForSelectablePosition(mItemCount - 1, true);
1.1875 + if (position >= 0) {
1.1876 + mLayoutMode = LAYOUT_FORCE_BOTTOM;
1.1877 + setSelectionInt(position);
1.1878 + invokeOnItemScrollListener();
1.1879 + }
1.1880 +
1.1881 + moved = true;
1.1882 + }
1.1883 + }
1.1884 +
1.1885 + if (moved && !awakenScrollbarsInternal()) {
1.1886 + awakenScrollbarsInternal();
1.1887 + invalidate();
1.1888 + }
1.1889 +
1.1890 + return moved;
1.1891 + }
1.1892 +
1.1893 + /**
1.1894 + * To avoid horizontal/vertical focus searches changing the selected item,
1.1895 + * we manually focus search within the selected item (as applicable), and
1.1896 + * prevent focus from jumping to something within another item.
1.1897 + *
1.1898 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.1899 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.1900 + * current view orientation.
1.1901 + *
1.1902 + * @return Whether this consumes the key event.
1.1903 + */
1.1904 + private boolean handleFocusWithinItem(int direction) {
1.1905 + forceValidInnerFocusDirection(direction);
1.1906 +
1.1907 + final int numChildren = getChildCount();
1.1908 +
1.1909 + if (mItemsCanFocus && numChildren > 0 && mSelectedPosition != INVALID_POSITION) {
1.1910 + final View selectedView = getSelectedView();
1.1911 +
1.1912 + if (selectedView != null && selectedView.hasFocus() &&
1.1913 + selectedView instanceof ViewGroup) {
1.1914 +
1.1915 + final View currentFocus = selectedView.findFocus();
1.1916 + final View nextFocus = FocusFinder.getInstance().findNextFocus(
1.1917 + (ViewGroup) selectedView, currentFocus, direction);
1.1918 +
1.1919 + if (nextFocus != null) {
1.1920 + // Do the math to get interesting rect in next focus' coordinates
1.1921 + currentFocus.getFocusedRect(mTempRect);
1.1922 + offsetDescendantRectToMyCoords(currentFocus, mTempRect);
1.1923 + offsetRectIntoDescendantCoords(nextFocus, mTempRect);
1.1924 +
1.1925 + if (nextFocus.requestFocus(direction, mTempRect)) {
1.1926 + return true;
1.1927 + }
1.1928 + }
1.1929 +
1.1930 + // We are blocking the key from being handled (by returning true)
1.1931 + // if the global result is going to be some other view within this
1.1932 + // list. This is to achieve the overall goal of having horizontal/vertical
1.1933 + // d-pad navigation remain in the current item depending on the current
1.1934 + // orientation in this view.
1.1935 + final View globalNextFocus = FocusFinder.getInstance().findNextFocus(
1.1936 + (ViewGroup) getRootView(), currentFocus, direction);
1.1937 +
1.1938 + if (globalNextFocus != null) {
1.1939 + return isViewAncestorOf(globalNextFocus, this);
1.1940 + }
1.1941 + }
1.1942 + }
1.1943 +
1.1944 + return false;
1.1945 + }
1.1946 +
1.1947 + /**
1.1948 + * Scrolls to the next or previous item if possible.
1.1949 + *
1.1950 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.1951 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.1952 + * current view orientation.
1.1953 + *
1.1954 + * @return whether selection was moved
1.1955 + */
1.1956 + private boolean arrowScroll(int direction) {
1.1957 + forceValidFocusDirection(direction);
1.1958 +
1.1959 + try {
1.1960 + mInLayout = true;
1.1961 +
1.1962 + final boolean handled = arrowScrollImpl(direction);
1.1963 + if (handled) {
1.1964 + playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction));
1.1965 + }
1.1966 +
1.1967 + return handled;
1.1968 + } finally {
1.1969 + mInLayout = false;
1.1970 + }
1.1971 + }
1.1972 +
1.1973 + /**
1.1974 + * When selection changes, it is possible that the previously selected or the
1.1975 + * next selected item will change its size. If so, we need to offset some folks,
1.1976 + * and re-layout the items as appropriate.
1.1977 + *
1.1978 + * @param selectedView The currently selected view (before changing selection).
1.1979 + * should be <code>null</code> if there was no previous selection.
1.1980 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.1981 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.1982 + * current view orientation.
1.1983 + * @param newSelectedPosition The position of the next selection.
1.1984 + * @param newFocusAssigned whether new focus was assigned. This matters because
1.1985 + * when something has focus, we don't want to show selection (ugh).
1.1986 + */
1.1987 + private void handleNewSelectionChange(View selectedView, int direction, int newSelectedPosition,
1.1988 + boolean newFocusAssigned) {
1.1989 + forceValidFocusDirection(direction);
1.1990 +
1.1991 + if (newSelectedPosition == INVALID_POSITION) {
1.1992 + throw new IllegalArgumentException("newSelectedPosition needs to be valid");
1.1993 + }
1.1994 +
1.1995 + // Whether or not we are moving down/right or up/left, we want to preserve the
1.1996 + // top/left of whatever view is at the start:
1.1997 + // - moving down/right: the view that had selection
1.1998 + // - moving up/left: the view that is getting selection
1.1999 + final int selectedIndex = mSelectedPosition - mFirstPosition;
1.2000 + final int nextSelectedIndex = newSelectedPosition - mFirstPosition;
1.2001 + int startViewIndex, endViewIndex;
1.2002 + boolean topSelected = false;
1.2003 + View startView;
1.2004 + View endView;
1.2005 +
1.2006 + if (direction == View.FOCUS_UP || direction == View.FOCUS_LEFT) {
1.2007 + startViewIndex = nextSelectedIndex;
1.2008 + endViewIndex = selectedIndex;
1.2009 + startView = getChildAt(startViewIndex);
1.2010 + endView = selectedView;
1.2011 + topSelected = true;
1.2012 + } else {
1.2013 + startViewIndex = selectedIndex;
1.2014 + endViewIndex = nextSelectedIndex;
1.2015 + startView = selectedView;
1.2016 + endView = getChildAt(endViewIndex);
1.2017 + }
1.2018 +
1.2019 + final int numChildren = getChildCount();
1.2020 +
1.2021 + // start with top view: is it changing size?
1.2022 + if (startView != null) {
1.2023 + startView.setSelected(!newFocusAssigned && topSelected);
1.2024 + measureAndAdjustDown(startView, startViewIndex, numChildren);
1.2025 + }
1.2026 +
1.2027 + // is the bottom view changing size?
1.2028 + if (endView != null) {
1.2029 + endView.setSelected(!newFocusAssigned && !topSelected);
1.2030 + measureAndAdjustDown(endView, endViewIndex, numChildren);
1.2031 + }
1.2032 + }
1.2033 +
1.2034 + /**
1.2035 + * Re-measure a child, and if its height changes, lay it out preserving its
1.2036 + * top, and adjust the children below it appropriately.
1.2037 + *
1.2038 + * @param child The child
1.2039 + * @param childIndex The view group index of the child.
1.2040 + * @param numChildren The number of children in the view group.
1.2041 + */
1.2042 + private void measureAndAdjustDown(View child, int childIndex, int numChildren) {
1.2043 + int oldHeight = child.getHeight();
1.2044 + measureChild(child);
1.2045 +
1.2046 + if (child.getMeasuredHeight() == oldHeight) {
1.2047 + return;
1.2048 + }
1.2049 +
1.2050 + // lay out the view, preserving its top
1.2051 + relayoutMeasuredChild(child);
1.2052 +
1.2053 + // adjust views below appropriately
1.2054 + final int heightDelta = child.getMeasuredHeight() - oldHeight;
1.2055 + for (int i = childIndex + 1; i < numChildren; i++) {
1.2056 + getChildAt(i).offsetTopAndBottom(heightDelta);
1.2057 + }
1.2058 + }
1.2059 +
1.2060 + /**
1.2061 + * Do an arrow scroll based on focus searching. If a new view is
1.2062 + * given focus, return the selection delta and amount to scroll via
1.2063 + * an {@link ArrowScrollFocusResult}, otherwise, return null.
1.2064 + *
1.2065 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.2066 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.2067 + * current view orientation.
1.2068 + *
1.2069 + * @return The result if focus has changed, or <code>null</code>.
1.2070 + */
1.2071 + private ArrowScrollFocusResult arrowScrollFocused(final int direction) {
1.2072 + forceValidFocusDirection(direction);
1.2073 +
1.2074 + final View selectedView = getSelectedView();
1.2075 + final View newFocus;
1.2076 + final int searchPoint;
1.2077 +
1.2078 + if (selectedView != null && selectedView.hasFocus()) {
1.2079 + View oldFocus = selectedView.findFocus();
1.2080 + newFocus = FocusFinder.getInstance().findNextFocus(this, oldFocus, direction);
1.2081 + } else {
1.2082 + if (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT) {
1.2083 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.2084 +
1.2085 + final int selectedStart;
1.2086 + if (selectedView != null) {
1.2087 + selectedStart = (mIsVertical ? selectedView.getTop() : selectedView.getLeft());
1.2088 + } else {
1.2089 + selectedStart = start;
1.2090 + }
1.2091 +
1.2092 + searchPoint = Math.max(selectedStart, start);
1.2093 + } else {
1.2094 + final int end = (mIsVertical ? getHeight() - getPaddingBottom() :
1.2095 + getWidth() - getPaddingRight());
1.2096 +
1.2097 + final int selectedEnd;
1.2098 + if (selectedView != null) {
1.2099 + selectedEnd = (mIsVertical ? selectedView.getBottom() : selectedView.getRight());
1.2100 + } else {
1.2101 + selectedEnd = end;
1.2102 + }
1.2103 +
1.2104 + searchPoint = Math.min(selectedEnd, end);
1.2105 + }
1.2106 +
1.2107 + final int x = (mIsVertical ? 0 : searchPoint);
1.2108 + final int y = (mIsVertical ? searchPoint : 0);
1.2109 + mTempRect.set(x, y, x, y);
1.2110 +
1.2111 + newFocus = FocusFinder.getInstance().findNextFocusFromRect(this, mTempRect, direction);
1.2112 + }
1.2113 +
1.2114 + if (newFocus != null) {
1.2115 + final int positionOfNewFocus = positionOfNewFocus(newFocus);
1.2116 +
1.2117 + // If the focus change is in a different new position, make sure
1.2118 + // we aren't jumping over another selectable position.
1.2119 + if (mSelectedPosition != INVALID_POSITION && positionOfNewFocus != mSelectedPosition) {
1.2120 + final int selectablePosition = lookForSelectablePositionOnScreen(direction);
1.2121 +
1.2122 + final boolean movingForward =
1.2123 + (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT);
1.2124 + final boolean movingBackward =
1.2125 + (direction == View.FOCUS_UP || direction == View.FOCUS_LEFT);
1.2126 +
1.2127 + if (selectablePosition != INVALID_POSITION &&
1.2128 + ((movingForward && selectablePosition < positionOfNewFocus) ||
1.2129 + (movingBackward && selectablePosition > positionOfNewFocus))) {
1.2130 + return null;
1.2131 + }
1.2132 + }
1.2133 +
1.2134 + int focusScroll = amountToScrollToNewFocus(direction, newFocus, positionOfNewFocus);
1.2135 +
1.2136 + final int maxScrollAmount = getMaxScrollAmount();
1.2137 + if (focusScroll < maxScrollAmount) {
1.2138 + // Not moving too far, safe to give next view focus
1.2139 + newFocus.requestFocus(direction);
1.2140 + mArrowScrollFocusResult.populate(positionOfNewFocus, focusScroll);
1.2141 + return mArrowScrollFocusResult;
1.2142 + } else if (distanceToView(newFocus) < maxScrollAmount){
1.2143 + // Case to consider:
1.2144 + // Too far to get entire next focusable on screen, but by going
1.2145 + // max scroll amount, we are getting it at least partially in view,
1.2146 + // so give it focus and scroll the max amount.
1.2147 + newFocus.requestFocus(direction);
1.2148 + mArrowScrollFocusResult.populate(positionOfNewFocus, maxScrollAmount);
1.2149 + return mArrowScrollFocusResult;
1.2150 + }
1.2151 + }
1.2152 +
1.2153 + return null;
1.2154 + }
1.2155 +
1.2156 + /**
1.2157 + * @return The maximum amount a list view will scroll in response to
1.2158 + * an arrow event.
1.2159 + */
1.2160 + public int getMaxScrollAmount() {
1.2161 + return (int) (MAX_SCROLL_FACTOR * getHeight());
1.2162 + }
1.2163 +
1.2164 + /**
1.2165 + * @return The amount to preview next items when arrow scrolling.
1.2166 + */
1.2167 + private int getArrowScrollPreviewLength() {
1.2168 + // FIXME: TwoWayView has no fading edge support just yet but using it
1.2169 + // makes it convenient for defining the next item's previous length.
1.2170 + int fadingEdgeLength =
1.2171 + (mIsVertical ? getVerticalFadingEdgeLength() : getHorizontalFadingEdgeLength());
1.2172 +
1.2173 + return mItemMargin + Math.max(MIN_SCROLL_PREVIEW_PIXELS, fadingEdgeLength);
1.2174 + }
1.2175 +
1.2176 + /**
1.2177 + * @param newFocus The view that would have focus.
1.2178 + * @return the position that contains newFocus
1.2179 + */
1.2180 + private int positionOfNewFocus(View newFocus) {
1.2181 + final int numChildren = getChildCount();
1.2182 +
1.2183 + for (int i = 0; i < numChildren; i++) {
1.2184 + final View child = getChildAt(i);
1.2185 + if (isViewAncestorOf(newFocus, child)) {
1.2186 + return mFirstPosition + i;
1.2187 + }
1.2188 + }
1.2189 +
1.2190 + throw new IllegalArgumentException("newFocus is not a child of any of the"
1.2191 + + " children of the list!");
1.2192 + }
1.2193 +
1.2194 + /**
1.2195 + * Handle an arrow scroll going up or down. Take into account whether items are selectable,
1.2196 + * whether there are focusable items, etc.
1.2197 + *
1.2198 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.2199 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.2200 + * current view orientation.
1.2201 + *
1.2202 + * @return Whether any scrolling, selection or focus change occurred.
1.2203 + */
1.2204 + private boolean arrowScrollImpl(int direction) {
1.2205 + forceValidFocusDirection(direction);
1.2206 +
1.2207 + if (getChildCount() <= 0) {
1.2208 + return false;
1.2209 + }
1.2210 +
1.2211 + View selectedView = getSelectedView();
1.2212 + int selectedPos = mSelectedPosition;
1.2213 +
1.2214 + int nextSelectedPosition = lookForSelectablePositionOnScreen(direction);
1.2215 + int amountToScroll = amountToScroll(direction, nextSelectedPosition);
1.2216 +
1.2217 + // If we are moving focus, we may OVERRIDE the default behaviour
1.2218 + final ArrowScrollFocusResult focusResult = (mItemsCanFocus ? arrowScrollFocused(direction) : null);
1.2219 + if (focusResult != null) {
1.2220 + nextSelectedPosition = focusResult.getSelectedPosition();
1.2221 + amountToScroll = focusResult.getAmountToScroll();
1.2222 + }
1.2223 +
1.2224 + boolean needToRedraw = (focusResult != null);
1.2225 + if (nextSelectedPosition != INVALID_POSITION) {
1.2226 + handleNewSelectionChange(selectedView, direction, nextSelectedPosition, focusResult != null);
1.2227 +
1.2228 + setSelectedPositionInt(nextSelectedPosition);
1.2229 + setNextSelectedPositionInt(nextSelectedPosition);
1.2230 +
1.2231 + selectedView = getSelectedView();
1.2232 + selectedPos = nextSelectedPosition;
1.2233 +
1.2234 + if (mItemsCanFocus && focusResult == null) {
1.2235 + // There was no new view found to take focus, make sure we
1.2236 + // don't leave focus with the old selection.
1.2237 + final View focused = getFocusedChild();
1.2238 + if (focused != null) {
1.2239 + focused.clearFocus();
1.2240 + }
1.2241 + }
1.2242 +
1.2243 + needToRedraw = true;
1.2244 + checkSelectionChanged();
1.2245 + }
1.2246 +
1.2247 + if (amountToScroll > 0) {
1.2248 + trackMotionScroll(direction == View.FOCUS_UP || direction == View.FOCUS_LEFT ?
1.2249 + amountToScroll : -amountToScroll);
1.2250 + needToRedraw = true;
1.2251 + }
1.2252 +
1.2253 + // If we didn't find a new focusable, make sure any existing focused
1.2254 + // item that was panned off screen gives up focus.
1.2255 + if (mItemsCanFocus && focusResult == null &&
1.2256 + selectedView != null && selectedView.hasFocus()) {
1.2257 + final View focused = selectedView.findFocus();
1.2258 + if (!isViewAncestorOf(focused, this) || distanceToView(focused) > 0) {
1.2259 + focused.clearFocus();
1.2260 + }
1.2261 + }
1.2262 +
1.2263 + // If the current selection is panned off, we need to remove the selection
1.2264 + if (nextSelectedPosition == INVALID_POSITION && selectedView != null
1.2265 + && !isViewAncestorOf(selectedView, this)) {
1.2266 + selectedView = null;
1.2267 + hideSelector();
1.2268 +
1.2269 + // But we don't want to set the ressurect position (that would make subsequent
1.2270 + // unhandled key events bring back the item we just scrolled off)
1.2271 + mResurrectToPosition = INVALID_POSITION;
1.2272 + }
1.2273 +
1.2274 + if (needToRedraw) {
1.2275 + if (selectedView != null) {
1.2276 + positionSelector(selectedPos, selectedView);
1.2277 + mSelectedStart = selectedView.getTop();
1.2278 + }
1.2279 +
1.2280 + if (!awakenScrollbarsInternal()) {
1.2281 + invalidate();
1.2282 + }
1.2283 +
1.2284 + invokeOnItemScrollListener();
1.2285 + return true;
1.2286 + }
1.2287 +
1.2288 + return false;
1.2289 + }
1.2290 +
1.2291 + /**
1.2292 + * Determine how much we need to scroll in order to get the next selected view
1.2293 + * visible. The amount is capped at {@link #getMaxScrollAmount()}.
1.2294 + *
1.2295 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.2296 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.2297 + * current view orientation.
1.2298 + * @param nextSelectedPosition The position of the next selection, or
1.2299 + * {@link #INVALID_POSITION} if there is no next selectable position
1.2300 + *
1.2301 + * @return The amount to scroll. Note: this is always positive! Direction
1.2302 + * needs to be taken into account when actually scrolling.
1.2303 + */
1.2304 + private int amountToScroll(int direction, int nextSelectedPosition) {
1.2305 + forceValidFocusDirection(direction);
1.2306 +
1.2307 + final int numChildren = getChildCount();
1.2308 +
1.2309 + if (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT) {
1.2310 + final int end = (mIsVertical ? getHeight() - getPaddingBottom() :
1.2311 + getWidth() - getPaddingRight());
1.2312 +
1.2313 + int indexToMakeVisible = numChildren - 1;
1.2314 + if (nextSelectedPosition != INVALID_POSITION) {
1.2315 + indexToMakeVisible = nextSelectedPosition - mFirstPosition;
1.2316 + }
1.2317 +
1.2318 + final int positionToMakeVisible = mFirstPosition + indexToMakeVisible;
1.2319 + final View viewToMakeVisible = getChildAt(indexToMakeVisible);
1.2320 +
1.2321 + int goalEnd = end;
1.2322 + if (positionToMakeVisible < mItemCount - 1) {
1.2323 + goalEnd -= getArrowScrollPreviewLength();
1.2324 + }
1.2325 +
1.2326 + final int viewToMakeVisibleStart =
1.2327 + (mIsVertical ? viewToMakeVisible.getTop() : viewToMakeVisible.getLeft());
1.2328 + final int viewToMakeVisibleEnd =
1.2329 + (mIsVertical ? viewToMakeVisible.getBottom() : viewToMakeVisible.getRight());
1.2330 +
1.2331 + if (viewToMakeVisibleEnd <= goalEnd) {
1.2332 + // Target item is fully visible
1.2333 + return 0;
1.2334 + }
1.2335 +
1.2336 + if (nextSelectedPosition != INVALID_POSITION &&
1.2337 + (goalEnd - viewToMakeVisibleStart) >= getMaxScrollAmount()) {
1.2338 + // Item already has enough of it visible, changing selection is good enough
1.2339 + return 0;
1.2340 + }
1.2341 +
1.2342 + int amountToScroll = (viewToMakeVisibleEnd - goalEnd);
1.2343 +
1.2344 + if (mFirstPosition + numChildren == mItemCount) {
1.2345 + final View lastChild = getChildAt(numChildren - 1);
1.2346 + final int lastChildEnd = (mIsVertical ? lastChild.getBottom() : lastChild.getRight());
1.2347 +
1.2348 + // Last is last in list -> Make sure we don't scroll past it
1.2349 + final int max = lastChildEnd - end;
1.2350 + amountToScroll = Math.min(amountToScroll, max);
1.2351 + }
1.2352 +
1.2353 + return Math.min(amountToScroll, getMaxScrollAmount());
1.2354 + } else {
1.2355 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.2356 +
1.2357 + int indexToMakeVisible = 0;
1.2358 + if (nextSelectedPosition != INVALID_POSITION) {
1.2359 + indexToMakeVisible = nextSelectedPosition - mFirstPosition;
1.2360 + }
1.2361 +
1.2362 + final int positionToMakeVisible = mFirstPosition + indexToMakeVisible;
1.2363 + final View viewToMakeVisible = getChildAt(indexToMakeVisible);
1.2364 +
1.2365 + int goalStart = start;
1.2366 + if (positionToMakeVisible > 0) {
1.2367 + goalStart += getArrowScrollPreviewLength();
1.2368 + }
1.2369 +
1.2370 + final int viewToMakeVisibleStart =
1.2371 + (mIsVertical ? viewToMakeVisible.getTop() : viewToMakeVisible.getLeft());
1.2372 + final int viewToMakeVisibleEnd =
1.2373 + (mIsVertical ? viewToMakeVisible.getBottom() : viewToMakeVisible.getRight());
1.2374 +
1.2375 + if (viewToMakeVisibleStart >= goalStart) {
1.2376 + // Item is fully visible
1.2377 + return 0;
1.2378 + }
1.2379 +
1.2380 + if (nextSelectedPosition != INVALID_POSITION &&
1.2381 + (viewToMakeVisibleEnd - goalStart) >= getMaxScrollAmount()) {
1.2382 + // Item already has enough of it visible, changing selection is good enough
1.2383 + return 0;
1.2384 + }
1.2385 +
1.2386 + int amountToScroll = (goalStart - viewToMakeVisibleStart);
1.2387 +
1.2388 + if (mFirstPosition == 0) {
1.2389 + final View firstChild = getChildAt(0);
1.2390 + final int firstChildStart = (mIsVertical ? firstChild.getTop() : firstChild.getLeft());
1.2391 +
1.2392 + // First is first in list -> make sure we don't scroll past it
1.2393 + final int max = start - firstChildStart;
1.2394 + amountToScroll = Math.min(amountToScroll, max);
1.2395 + }
1.2396 +
1.2397 + return Math.min(amountToScroll, getMaxScrollAmount());
1.2398 + }
1.2399 + }
1.2400 +
1.2401 + /**
1.2402 + * Determine how much we need to scroll in order to get newFocus in view.
1.2403 + *
1.2404 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.2405 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.2406 + * current view orientation.
1.2407 + * @param newFocus The view that would take focus.
1.2408 + * @param positionOfNewFocus The position of the list item containing newFocus
1.2409 + *
1.2410 + * @return The amount to scroll. Note: this is always positive! Direction
1.2411 + * needs to be taken into account when actually scrolling.
1.2412 + */
1.2413 + private int amountToScrollToNewFocus(int direction, View newFocus, int positionOfNewFocus) {
1.2414 + forceValidFocusDirection(direction);
1.2415 +
1.2416 + int amountToScroll = 0;
1.2417 +
1.2418 + newFocus.getDrawingRect(mTempRect);
1.2419 + offsetDescendantRectToMyCoords(newFocus, mTempRect);
1.2420 +
1.2421 + if (direction == View.FOCUS_UP || direction == View.FOCUS_LEFT) {
1.2422 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.2423 + final int newFocusStart = (mIsVertical ? mTempRect.top : mTempRect.left);
1.2424 +
1.2425 + if (newFocusStart < start) {
1.2426 + amountToScroll = start - newFocusStart;
1.2427 + if (positionOfNewFocus > 0) {
1.2428 + amountToScroll += getArrowScrollPreviewLength();
1.2429 + }
1.2430 + }
1.2431 + } else {
1.2432 + final int end = (mIsVertical ? getHeight() - getPaddingBottom() :
1.2433 + getWidth() - getPaddingRight());
1.2434 + final int newFocusEnd = (mIsVertical ? mTempRect.bottom : mTempRect.right);
1.2435 +
1.2436 + if (newFocusEnd > end) {
1.2437 + amountToScroll = newFocusEnd - end;
1.2438 + if (positionOfNewFocus < mItemCount - 1) {
1.2439 + amountToScroll += getArrowScrollPreviewLength();
1.2440 + }
1.2441 + }
1.2442 + }
1.2443 +
1.2444 + return amountToScroll;
1.2445 + }
1.2446 +
1.2447 + /**
1.2448 + * Determine the distance to the nearest edge of a view in a particular
1.2449 + * direction.
1.2450 + *
1.2451 + * @param descendant A descendant of this list.
1.2452 + * @return The distance, or 0 if the nearest edge is already on screen.
1.2453 + */
1.2454 + private int distanceToView(View descendant) {
1.2455 + descendant.getDrawingRect(mTempRect);
1.2456 + offsetDescendantRectToMyCoords(descendant, mTempRect);
1.2457 +
1.2458 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.2459 + final int end = (mIsVertical ? getHeight() - getPaddingBottom() :
1.2460 + getWidth() - getPaddingRight());
1.2461 +
1.2462 + final int viewStart = (mIsVertical ? mTempRect.top : mTempRect.left);
1.2463 + final int viewEnd = (mIsVertical ? mTempRect.bottom : mTempRect.right);
1.2464 +
1.2465 + int distance = 0;
1.2466 + if (viewEnd < start) {
1.2467 + distance = start - viewEnd;
1.2468 + } else if (viewStart > end) {
1.2469 + distance = viewStart - end;
1.2470 + }
1.2471 +
1.2472 + return distance;
1.2473 + }
1.2474 +
1.2475 + private boolean handleKeyScroll(KeyEvent event, int count, int direction) {
1.2476 + boolean handled = false;
1.2477 +
1.2478 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2479 + handled = resurrectSelectionIfNeeded();
1.2480 + if (!handled) {
1.2481 + while (count-- > 0) {
1.2482 + if (arrowScroll(direction)) {
1.2483 + handled = true;
1.2484 + } else {
1.2485 + break;
1.2486 + }
1.2487 + }
1.2488 + }
1.2489 + } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_ALT_ON)) {
1.2490 + handled = resurrectSelectionIfNeeded() || fullScroll(direction);
1.2491 + }
1.2492 +
1.2493 + return handled;
1.2494 + }
1.2495 +
1.2496 + private boolean handleKeyEvent(int keyCode, int count, KeyEvent event) {
1.2497 + if (mAdapter == null || !mIsAttached) {
1.2498 + return false;
1.2499 + }
1.2500 +
1.2501 + if (mDataChanged) {
1.2502 + layoutChildren();
1.2503 + }
1.2504 +
1.2505 + boolean handled = false;
1.2506 + final int action = event.getAction();
1.2507 +
1.2508 + if (action != KeyEvent.ACTION_UP) {
1.2509 + switch (keyCode) {
1.2510 + case KeyEvent.KEYCODE_DPAD_UP:
1.2511 + if (mIsVertical) {
1.2512 + handled = handleKeyScroll(event, count, View.FOCUS_UP);
1.2513 + } else if (KeyEventCompat.hasNoModifiers(event)) {
1.2514 + handled = handleFocusWithinItem(View.FOCUS_UP);
1.2515 + }
1.2516 + break;
1.2517 +
1.2518 + case KeyEvent.KEYCODE_DPAD_DOWN: {
1.2519 + if (mIsVertical) {
1.2520 + handled = handleKeyScroll(event, count, View.FOCUS_DOWN);
1.2521 + } else if (KeyEventCompat.hasNoModifiers(event)) {
1.2522 + handled = handleFocusWithinItem(View.FOCUS_DOWN);
1.2523 + }
1.2524 + break;
1.2525 + }
1.2526 +
1.2527 + case KeyEvent.KEYCODE_DPAD_LEFT:
1.2528 + if (!mIsVertical) {
1.2529 + handled = handleKeyScroll(event, count, View.FOCUS_LEFT);
1.2530 + } else if (KeyEventCompat.hasNoModifiers(event)) {
1.2531 + handled = handleFocusWithinItem(View.FOCUS_LEFT);
1.2532 + }
1.2533 + break;
1.2534 +
1.2535 + case KeyEvent.KEYCODE_DPAD_RIGHT:
1.2536 + if (!mIsVertical) {
1.2537 + handled = handleKeyScroll(event, count, View.FOCUS_RIGHT);
1.2538 + } else if (KeyEventCompat.hasNoModifiers(event)) {
1.2539 + handled = handleFocusWithinItem(View.FOCUS_RIGHT);
1.2540 + }
1.2541 + break;
1.2542 +
1.2543 + case KeyEvent.KEYCODE_DPAD_CENTER:
1.2544 + case KeyEvent.KEYCODE_ENTER:
1.2545 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2546 + handled = resurrectSelectionIfNeeded();
1.2547 + if (!handled
1.2548 + && event.getRepeatCount() == 0 && getChildCount() > 0) {
1.2549 + keyPressed();
1.2550 + handled = true;
1.2551 + }
1.2552 + }
1.2553 + break;
1.2554 +
1.2555 + case KeyEvent.KEYCODE_SPACE:
1.2556 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2557 + handled = resurrectSelectionIfNeeded() ||
1.2558 + pageScroll(mIsVertical ? View.FOCUS_DOWN : View.FOCUS_RIGHT);
1.2559 + } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_SHIFT_ON)) {
1.2560 + handled = resurrectSelectionIfNeeded() ||
1.2561 + fullScroll(mIsVertical ? View.FOCUS_UP : View.FOCUS_LEFT);
1.2562 + }
1.2563 +
1.2564 + handled = true;
1.2565 + break;
1.2566 +
1.2567 + case KeyEvent.KEYCODE_PAGE_UP:
1.2568 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2569 + handled = resurrectSelectionIfNeeded() ||
1.2570 + pageScroll(mIsVertical ? View.FOCUS_UP : View.FOCUS_LEFT);
1.2571 + } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_ALT_ON)) {
1.2572 + handled = resurrectSelectionIfNeeded() ||
1.2573 + fullScroll(mIsVertical ? View.FOCUS_UP : View.FOCUS_LEFT);
1.2574 + }
1.2575 + break;
1.2576 +
1.2577 + case KeyEvent.KEYCODE_PAGE_DOWN:
1.2578 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2579 + handled = resurrectSelectionIfNeeded() ||
1.2580 + pageScroll(mIsVertical ? View.FOCUS_DOWN : View.FOCUS_RIGHT);
1.2581 + } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_ALT_ON)) {
1.2582 + handled = resurrectSelectionIfNeeded() ||
1.2583 + fullScroll(mIsVertical ? View.FOCUS_DOWN : View.FOCUS_RIGHT);
1.2584 + }
1.2585 + break;
1.2586 +
1.2587 + case KeyEvent.KEYCODE_MOVE_HOME:
1.2588 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2589 + handled = resurrectSelectionIfNeeded() ||
1.2590 + fullScroll(mIsVertical ? View.FOCUS_UP : View.FOCUS_LEFT);
1.2591 + }
1.2592 + break;
1.2593 +
1.2594 + case KeyEvent.KEYCODE_MOVE_END:
1.2595 + if (KeyEventCompat.hasNoModifiers(event)) {
1.2596 + handled = resurrectSelectionIfNeeded() ||
1.2597 + fullScroll(mIsVertical ? View.FOCUS_DOWN : View.FOCUS_RIGHT);
1.2598 + }
1.2599 + break;
1.2600 + }
1.2601 + }
1.2602 +
1.2603 + if (handled) {
1.2604 + return true;
1.2605 + }
1.2606 +
1.2607 + switch (action) {
1.2608 + case KeyEvent.ACTION_DOWN:
1.2609 + return super.onKeyDown(keyCode, event);
1.2610 +
1.2611 + case KeyEvent.ACTION_UP:
1.2612 + if (!isEnabled()) {
1.2613 + return true;
1.2614 + }
1.2615 +
1.2616 + if (isClickable() && isPressed() &&
1.2617 + mSelectedPosition >= 0 && mAdapter != null &&
1.2618 + mSelectedPosition < mAdapter.getCount()) {
1.2619 +
1.2620 + final View child = getChildAt(mSelectedPosition - mFirstPosition);
1.2621 + if (child != null) {
1.2622 + performItemClick(child, mSelectedPosition, mSelectedRowId);
1.2623 + child.setPressed(false);
1.2624 + }
1.2625 +
1.2626 + setPressed(false);
1.2627 + return true;
1.2628 + }
1.2629 +
1.2630 + return false;
1.2631 +
1.2632 + case KeyEvent.ACTION_MULTIPLE:
1.2633 + return super.onKeyMultiple(keyCode, count, event);
1.2634 +
1.2635 + default:
1.2636 + return false;
1.2637 + }
1.2638 + }
1.2639 +
1.2640 + private void initOrResetVelocityTracker() {
1.2641 + if (mVelocityTracker == null) {
1.2642 + mVelocityTracker = VelocityTracker.obtain();
1.2643 + } else {
1.2644 + mVelocityTracker.clear();
1.2645 + }
1.2646 + }
1.2647 +
1.2648 + private void initVelocityTrackerIfNotExists() {
1.2649 + if (mVelocityTracker == null) {
1.2650 + mVelocityTracker = VelocityTracker.obtain();
1.2651 + }
1.2652 + }
1.2653 +
1.2654 + private void recycleVelocityTracker() {
1.2655 + if (mVelocityTracker != null) {
1.2656 + mVelocityTracker.recycle();
1.2657 + mVelocityTracker = null;
1.2658 + }
1.2659 + }
1.2660 +
1.2661 + /**
1.2662 + * Notify our scroll listener (if there is one) of a change in scroll state
1.2663 + */
1.2664 + private void invokeOnItemScrollListener() {
1.2665 + if (mOnScrollListener != null) {
1.2666 + mOnScrollListener.onScroll(this, mFirstPosition, getChildCount(), mItemCount);
1.2667 + }
1.2668 +
1.2669 + // Dummy values, View's implementation does not use these.
1.2670 + onScrollChanged(0, 0, 0, 0);
1.2671 + }
1.2672 +
1.2673 + private void reportScrollStateChange(int newState) {
1.2674 + if (newState == mLastScrollState) {
1.2675 + return;
1.2676 + }
1.2677 +
1.2678 + if (mOnScrollListener != null) {
1.2679 + mLastScrollState = newState;
1.2680 + mOnScrollListener.onScrollStateChanged(this, newState);
1.2681 + }
1.2682 + }
1.2683 +
1.2684 + private boolean maybeStartScrolling(int delta) {
1.2685 + final boolean isOverScroll = (mOverScroll != 0);
1.2686 + if (Math.abs(delta) <= mTouchSlop && !isOverScroll) {
1.2687 + return false;
1.2688 + }
1.2689 +
1.2690 + if (isOverScroll) {
1.2691 + mTouchMode = TOUCH_MODE_OVERSCROLL;
1.2692 + } else {
1.2693 + mTouchMode = TOUCH_MODE_DRAGGING;
1.2694 + }
1.2695 +
1.2696 + // Time to start stealing events! Once we've stolen them, don't
1.2697 + // let anyone steal from us.
1.2698 + final ViewParent parent = getParent();
1.2699 + if (parent != null) {
1.2700 + parent.requestDisallowInterceptTouchEvent(true);
1.2701 + }
1.2702 +
1.2703 + cancelCheckForLongPress();
1.2704 +
1.2705 + setPressed(false);
1.2706 + View motionView = getChildAt(mMotionPosition - mFirstPosition);
1.2707 + if (motionView != null) {
1.2708 + motionView.setPressed(false);
1.2709 + }
1.2710 +
1.2711 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
1.2712 +
1.2713 + return true;
1.2714 + }
1.2715 +
1.2716 + private void maybeScroll(int delta) {
1.2717 + if (mTouchMode == TOUCH_MODE_DRAGGING) {
1.2718 + handleDragChange(delta);
1.2719 + } else if (mTouchMode == TOUCH_MODE_OVERSCROLL) {
1.2720 + handleOverScrollChange(delta);
1.2721 + }
1.2722 + }
1.2723 +
1.2724 + private void handleDragChange(int delta) {
1.2725 + // Time to start stealing events! Once we've stolen them, don't
1.2726 + // let anyone steal from us.
1.2727 + final ViewParent parent = getParent();
1.2728 + if (parent != null) {
1.2729 + parent.requestDisallowInterceptTouchEvent(true);
1.2730 + }
1.2731 +
1.2732 + final int motionIndex;
1.2733 + if (mMotionPosition >= 0) {
1.2734 + motionIndex = mMotionPosition - mFirstPosition;
1.2735 + } else {
1.2736 + // If we don't have a motion position that we can reliably track,
1.2737 + // pick something in the middle to make a best guess at things below.
1.2738 + motionIndex = getChildCount() / 2;
1.2739 + }
1.2740 +
1.2741 + int motionViewPrevStart = 0;
1.2742 + View motionView = this.getChildAt(motionIndex);
1.2743 + if (motionView != null) {
1.2744 + motionViewPrevStart = (mIsVertical ? motionView.getTop() : motionView.getLeft());
1.2745 + }
1.2746 +
1.2747 + boolean atEdge = trackMotionScroll(delta);
1.2748 +
1.2749 + motionView = this.getChildAt(motionIndex);
1.2750 + if (motionView != null) {
1.2751 + final int motionViewRealStart =
1.2752 + (mIsVertical ? motionView.getTop() : motionView.getLeft());
1.2753 +
1.2754 + if (atEdge) {
1.2755 + final int overscroll = -delta - (motionViewRealStart - motionViewPrevStart);
1.2756 + updateOverScrollState(delta, overscroll);
1.2757 + }
1.2758 + }
1.2759 + }
1.2760 +
1.2761 + private void updateOverScrollState(int delta, int overscroll) {
1.2762 + overScrollByInternal((mIsVertical ? 0 : overscroll),
1.2763 + (mIsVertical ? overscroll : 0),
1.2764 + (mIsVertical ? 0 : mOverScroll),
1.2765 + (mIsVertical ? mOverScroll : 0),
1.2766 + 0, 0,
1.2767 + (mIsVertical ? 0 : mOverscrollDistance),
1.2768 + (mIsVertical ? mOverscrollDistance : 0),
1.2769 + true);
1.2770 +
1.2771 + if (Math.abs(mOverscrollDistance) == Math.abs(mOverScroll)) {
1.2772 + // Break fling velocity if we impacted an edge
1.2773 + if (mVelocityTracker != null) {
1.2774 + mVelocityTracker.clear();
1.2775 + }
1.2776 + }
1.2777 +
1.2778 + final int overscrollMode = ViewCompat.getOverScrollMode(this);
1.2779 + if (overscrollMode == ViewCompat.OVER_SCROLL_ALWAYS ||
1.2780 + (overscrollMode == ViewCompat.OVER_SCROLL_IF_CONTENT_SCROLLS && !contentFits())) {
1.2781 + mTouchMode = TOUCH_MODE_OVERSCROLL;
1.2782 +
1.2783 + float pull = (float) overscroll / (mIsVertical ? getHeight() : getWidth());
1.2784 + if (delta > 0) {
1.2785 + mStartEdge.onPull(pull);
1.2786 +
1.2787 + if (!mEndEdge.isFinished()) {
1.2788 + mEndEdge.onRelease();
1.2789 + }
1.2790 + } else if (delta < 0) {
1.2791 + mEndEdge.onPull(pull);
1.2792 +
1.2793 + if (!mStartEdge.isFinished()) {
1.2794 + mStartEdge.onRelease();
1.2795 + }
1.2796 + }
1.2797 +
1.2798 + if (delta != 0) {
1.2799 + ViewCompat.postInvalidateOnAnimation(this);
1.2800 + }
1.2801 + }
1.2802 + }
1.2803 +
1.2804 + private void handleOverScrollChange(int delta) {
1.2805 + final int oldOverScroll = mOverScroll;
1.2806 + final int newOverScroll = oldOverScroll - delta;
1.2807 +
1.2808 + int overScrollDistance = -delta;
1.2809 + if ((newOverScroll < 0 && oldOverScroll >= 0) ||
1.2810 + (newOverScroll > 0 && oldOverScroll <= 0)) {
1.2811 + overScrollDistance = -oldOverScroll;
1.2812 + delta += overScrollDistance;
1.2813 + } else {
1.2814 + delta = 0;
1.2815 + }
1.2816 +
1.2817 + if (overScrollDistance != 0) {
1.2818 + updateOverScrollState(delta, overScrollDistance);
1.2819 + }
1.2820 +
1.2821 + if (delta != 0) {
1.2822 + if (mOverScroll != 0) {
1.2823 + mOverScroll = 0;
1.2824 + ViewCompat.postInvalidateOnAnimation(this);
1.2825 + }
1.2826 +
1.2827 + trackMotionScroll(delta);
1.2828 + mTouchMode = TOUCH_MODE_DRAGGING;
1.2829 +
1.2830 + // We did not scroll the full amount. Treat this essentially like the
1.2831 + // start of a new touch scroll
1.2832 + mMotionPosition = findClosestMotionRowOrColumn((int) mLastTouchPos);
1.2833 + mTouchRemainderPos = 0;
1.2834 + }
1.2835 + }
1.2836 +
1.2837 + /**
1.2838 + * What is the distance between the source and destination rectangles given the direction of
1.2839 + * focus navigation between them? The direction basically helps figure out more quickly what is
1.2840 + * self evident by the relationship between the rects...
1.2841 + *
1.2842 + * @param source the source rectangle
1.2843 + * @param dest the destination rectangle
1.2844 + * @param direction the direction
1.2845 + * @return the distance between the rectangles
1.2846 + */
1.2847 + private static int getDistance(Rect source, Rect dest, int direction) {
1.2848 + int sX, sY; // source x, y
1.2849 + int dX, dY; // dest x, y
1.2850 +
1.2851 + switch (direction) {
1.2852 + case View.FOCUS_RIGHT:
1.2853 + sX = source.right;
1.2854 + sY = source.top + source.height() / 2;
1.2855 + dX = dest.left;
1.2856 + dY = dest.top + dest.height() / 2;
1.2857 + break;
1.2858 +
1.2859 + case View.FOCUS_DOWN:
1.2860 + sX = source.left + source.width() / 2;
1.2861 + sY = source.bottom;
1.2862 + dX = dest.left + dest.width() / 2;
1.2863 + dY = dest.top;
1.2864 + break;
1.2865 +
1.2866 + case View.FOCUS_LEFT:
1.2867 + sX = source.left;
1.2868 + sY = source.top + source.height() / 2;
1.2869 + dX = dest.right;
1.2870 + dY = dest.top + dest.height() / 2;
1.2871 + break;
1.2872 +
1.2873 + case View.FOCUS_UP:
1.2874 + sX = source.left + source.width() / 2;
1.2875 + sY = source.top;
1.2876 + dX = dest.left + dest.width() / 2;
1.2877 + dY = dest.bottom;
1.2878 + break;
1.2879 +
1.2880 + case View.FOCUS_FORWARD:
1.2881 + case View.FOCUS_BACKWARD:
1.2882 + sX = source.right + source.width() / 2;
1.2883 + sY = source.top + source.height() / 2;
1.2884 + dX = dest.left + dest.width() / 2;
1.2885 + dY = dest.top + dest.height() / 2;
1.2886 + break;
1.2887 +
1.2888 + default:
1.2889 + throw new IllegalArgumentException("direction must be one of "
1.2890 + + "{FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, "
1.2891 + + "FOCUS_FORWARD, FOCUS_BACKWARD}.");
1.2892 + }
1.2893 +
1.2894 + int deltaX = dX - sX;
1.2895 + int deltaY = dY - sY;
1.2896 +
1.2897 + return deltaY * deltaY + deltaX * deltaX;
1.2898 + }
1.2899 +
1.2900 + private int findMotionRowOrColumn(int motionPos) {
1.2901 + int childCount = getChildCount();
1.2902 + if (childCount == 0) {
1.2903 + return INVALID_POSITION;
1.2904 + }
1.2905 +
1.2906 + for (int i = 0; i < childCount; i++) {
1.2907 + View v = getChildAt(i);
1.2908 +
1.2909 + if ((mIsVertical && motionPos <= v.getBottom()) ||
1.2910 + (!mIsVertical && motionPos <= v.getRight())) {
1.2911 + return mFirstPosition + i;
1.2912 + }
1.2913 + }
1.2914 +
1.2915 + return INVALID_POSITION;
1.2916 + }
1.2917 +
1.2918 + private int findClosestMotionRowOrColumn(int motionPos) {
1.2919 + final int childCount = getChildCount();
1.2920 + if (childCount == 0) {
1.2921 + return INVALID_POSITION;
1.2922 + }
1.2923 +
1.2924 + final int motionRow = findMotionRowOrColumn(motionPos);
1.2925 + if (motionRow != INVALID_POSITION) {
1.2926 + return motionRow;
1.2927 + } else {
1.2928 + return mFirstPosition + childCount - 1;
1.2929 + }
1.2930 + }
1.2931 +
1.2932 + @TargetApi(9)
1.2933 + private int getScaledOverscrollDistance(ViewConfiguration vc) {
1.2934 + if (Build.VERSION.SDK_INT < 9) {
1.2935 + return 0;
1.2936 + }
1.2937 +
1.2938 + return vc.getScaledOverscrollDistance();
1.2939 + }
1.2940 +
1.2941 + private boolean contentFits() {
1.2942 + final int childCount = getChildCount();
1.2943 + if (childCount == 0) {
1.2944 + return true;
1.2945 + }
1.2946 +
1.2947 + if (childCount != mItemCount) {
1.2948 + return false;
1.2949 + }
1.2950 +
1.2951 + View first = getChildAt(0);
1.2952 + View last = getChildAt(childCount - 1);
1.2953 +
1.2954 + if (mIsVertical) {
1.2955 + return first.getTop() >= getPaddingTop() &&
1.2956 + last.getBottom() <= getHeight() - getPaddingBottom();
1.2957 + } else {
1.2958 + return first.getLeft() >= getPaddingLeft() &&
1.2959 + last.getRight() <= getWidth() - getPaddingRight();
1.2960 + }
1.2961 + }
1.2962 +
1.2963 + private void updateScrollbarsDirection() {
1.2964 + setHorizontalScrollBarEnabled(!mIsVertical);
1.2965 + setVerticalScrollBarEnabled(mIsVertical);
1.2966 + }
1.2967 +
1.2968 + private void triggerCheckForTap() {
1.2969 + if (mPendingCheckForTap == null) {
1.2970 + mPendingCheckForTap = new CheckForTap();
1.2971 + }
1.2972 +
1.2973 + postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());
1.2974 + }
1.2975 +
1.2976 + private void cancelCheckForTap() {
1.2977 + if (mPendingCheckForTap == null) {
1.2978 + return;
1.2979 + }
1.2980 +
1.2981 + removeCallbacks(mPendingCheckForTap);
1.2982 + }
1.2983 +
1.2984 + private void triggerCheckForLongPress() {
1.2985 + if (mPendingCheckForLongPress == null) {
1.2986 + mPendingCheckForLongPress = new CheckForLongPress();
1.2987 + }
1.2988 +
1.2989 + mPendingCheckForLongPress.rememberWindowAttachCount();
1.2990 +
1.2991 + postDelayed(mPendingCheckForLongPress,
1.2992 + ViewConfiguration.getLongPressTimeout());
1.2993 + }
1.2994 +
1.2995 + private void cancelCheckForLongPress() {
1.2996 + if (mPendingCheckForLongPress == null) {
1.2997 + return;
1.2998 + }
1.2999 +
1.3000 + removeCallbacks(mPendingCheckForLongPress);
1.3001 + }
1.3002 +
1.3003 + boolean trackMotionScroll(int incrementalDelta) {
1.3004 + final int childCount = getChildCount();
1.3005 + if (childCount == 0) {
1.3006 + return true;
1.3007 + }
1.3008 +
1.3009 + final View first = getChildAt(0);
1.3010 + final int firstStart = (mIsVertical ? first.getTop() : first.getLeft());
1.3011 +
1.3012 + final View last = getChildAt(childCount - 1);
1.3013 + final int lastEnd = (mIsVertical ? last.getBottom() : last.getRight());
1.3014 +
1.3015 + final int paddingTop = getPaddingTop();
1.3016 + final int paddingBottom = getPaddingBottom();
1.3017 + final int paddingLeft = getPaddingLeft();
1.3018 + final int paddingRight = getPaddingRight();
1.3019 +
1.3020 + final int paddingStart = (mIsVertical ? paddingTop : paddingLeft);
1.3021 +
1.3022 + final int spaceBefore = paddingStart - firstStart;
1.3023 + final int end = (mIsVertical ? getHeight() - paddingBottom :
1.3024 + getWidth() - paddingRight);
1.3025 + final int spaceAfter = lastEnd - end;
1.3026 +
1.3027 + final int size;
1.3028 + if (mIsVertical) {
1.3029 + size = getHeight() - paddingBottom - paddingTop;
1.3030 + } else {
1.3031 + size = getWidth() - paddingRight - paddingLeft;
1.3032 + }
1.3033 +
1.3034 + if (incrementalDelta < 0) {
1.3035 + incrementalDelta = Math.max(-(size - 1), incrementalDelta);
1.3036 + } else {
1.3037 + incrementalDelta = Math.min(size - 1, incrementalDelta);
1.3038 + }
1.3039 +
1.3040 + final int firstPosition = mFirstPosition;
1.3041 +
1.3042 + final boolean cannotScrollDown = (firstPosition == 0 &&
1.3043 + firstStart >= paddingStart && incrementalDelta >= 0);
1.3044 + final boolean cannotScrollUp = (firstPosition + childCount == mItemCount &&
1.3045 + lastEnd <= end && incrementalDelta <= 0);
1.3046 +
1.3047 + if (cannotScrollDown || cannotScrollUp) {
1.3048 + return incrementalDelta != 0;
1.3049 + }
1.3050 +
1.3051 + final boolean inTouchMode = isInTouchMode();
1.3052 + if (inTouchMode) {
1.3053 + hideSelector();
1.3054 + }
1.3055 +
1.3056 + int start = 0;
1.3057 + int count = 0;
1.3058 +
1.3059 + final boolean down = (incrementalDelta < 0);
1.3060 + if (down) {
1.3061 + int childrenStart = -incrementalDelta + paddingStart;
1.3062 +
1.3063 + for (int i = 0; i < childCount; i++) {
1.3064 + final View child = getChildAt(i);
1.3065 + final int childEnd = (mIsVertical ? child.getBottom() : child.getRight());
1.3066 +
1.3067 + if (childEnd >= childrenStart) {
1.3068 + break;
1.3069 + }
1.3070 +
1.3071 + count++;
1.3072 + mRecycler.addScrapView(child, firstPosition + i);
1.3073 + }
1.3074 + } else {
1.3075 + int childrenEnd = end - incrementalDelta;
1.3076 +
1.3077 + for (int i = childCount - 1; i >= 0; i--) {
1.3078 + final View child = getChildAt(i);
1.3079 + final int childStart = (mIsVertical ? child.getTop() : child.getLeft());
1.3080 +
1.3081 + if (childStart <= childrenEnd) {
1.3082 + break;
1.3083 + }
1.3084 +
1.3085 + start = i;
1.3086 + count++;
1.3087 + mRecycler.addScrapView(child, firstPosition + i);
1.3088 + }
1.3089 + }
1.3090 +
1.3091 + mBlockLayoutRequests = true;
1.3092 +
1.3093 + if (count > 0) {
1.3094 + detachViewsFromParent(start, count);
1.3095 + }
1.3096 +
1.3097 + // invalidate before moving the children to avoid unnecessary invalidate
1.3098 + // calls to bubble up from the children all the way to the top
1.3099 + if (!awakenScrollbarsInternal()) {
1.3100 + invalidate();
1.3101 + }
1.3102 +
1.3103 + offsetChildren(incrementalDelta);
1.3104 +
1.3105 + if (down) {
1.3106 + mFirstPosition += count;
1.3107 + }
1.3108 +
1.3109 + final int absIncrementalDelta = Math.abs(incrementalDelta);
1.3110 + if (spaceBefore < absIncrementalDelta || spaceAfter < absIncrementalDelta) {
1.3111 + fillGap(down);
1.3112 + }
1.3113 +
1.3114 + if (!inTouchMode && mSelectedPosition != INVALID_POSITION) {
1.3115 + final int childIndex = mSelectedPosition - mFirstPosition;
1.3116 + if (childIndex >= 0 && childIndex < getChildCount()) {
1.3117 + positionSelector(mSelectedPosition, getChildAt(childIndex));
1.3118 + }
1.3119 + } else if (mSelectorPosition != INVALID_POSITION) {
1.3120 + final int childIndex = mSelectorPosition - mFirstPosition;
1.3121 + if (childIndex >= 0 && childIndex < getChildCount()) {
1.3122 + positionSelector(INVALID_POSITION, getChildAt(childIndex));
1.3123 + }
1.3124 + } else {
1.3125 + mSelectorRect.setEmpty();
1.3126 + }
1.3127 +
1.3128 + mBlockLayoutRequests = false;
1.3129 +
1.3130 + invokeOnItemScrollListener();
1.3131 +
1.3132 + return false;
1.3133 + }
1.3134 +
1.3135 + @TargetApi(14)
1.3136 + private final float getCurrVelocity() {
1.3137 + if (Build.VERSION.SDK_INT >= 14) {
1.3138 + return mScroller.getCurrVelocity();
1.3139 + }
1.3140 +
1.3141 + return 0;
1.3142 + }
1.3143 +
1.3144 + @TargetApi(5)
1.3145 + private boolean awakenScrollbarsInternal() {
1.3146 + if (Build.VERSION.SDK_INT >= 5) {
1.3147 + return super.awakenScrollBars();
1.3148 + } else {
1.3149 + return false;
1.3150 + }
1.3151 + }
1.3152 +
1.3153 + @Override
1.3154 + public void computeScroll() {
1.3155 + if (!mScroller.computeScrollOffset()) {
1.3156 + return;
1.3157 + }
1.3158 +
1.3159 + final int pos;
1.3160 + if (mIsVertical) {
1.3161 + pos = mScroller.getCurrY();
1.3162 + } else {
1.3163 + pos = mScroller.getCurrX();
1.3164 + }
1.3165 +
1.3166 + final int diff = (int) (pos - mLastTouchPos);
1.3167 + mLastTouchPos = pos;
1.3168 +
1.3169 + final boolean stopped = trackMotionScroll(diff);
1.3170 +
1.3171 + if (!stopped && !mScroller.isFinished()) {
1.3172 + ViewCompat.postInvalidateOnAnimation(this);
1.3173 + } else {
1.3174 + if (stopped) {
1.3175 + final int overScrollMode = ViewCompat.getOverScrollMode(this);
1.3176 + if (overScrollMode != ViewCompat.OVER_SCROLL_NEVER) {
1.3177 + final EdgeEffectCompat edge =
1.3178 + (diff > 0 ? mStartEdge : mEndEdge);
1.3179 +
1.3180 + boolean needsInvalidate =
1.3181 + edge.onAbsorb(Math.abs((int) getCurrVelocity()));
1.3182 +
1.3183 + if (needsInvalidate) {
1.3184 + ViewCompat.postInvalidateOnAnimation(this);
1.3185 + }
1.3186 + }
1.3187 +
1.3188 + mScroller.abortAnimation();
1.3189 + }
1.3190 +
1.3191 + mTouchMode = TOUCH_MODE_REST;
1.3192 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.3193 + }
1.3194 + }
1.3195 +
1.3196 + private void finishEdgeGlows() {
1.3197 + if (mStartEdge != null) {
1.3198 + mStartEdge.finish();
1.3199 + }
1.3200 +
1.3201 + if (mEndEdge != null) {
1.3202 + mEndEdge.finish();
1.3203 + }
1.3204 + }
1.3205 +
1.3206 + private boolean drawStartEdge(Canvas canvas) {
1.3207 + if (mStartEdge.isFinished()) {
1.3208 + return false;
1.3209 + }
1.3210 +
1.3211 + if (mIsVertical) {
1.3212 + return mStartEdge.draw(canvas);
1.3213 + }
1.3214 +
1.3215 + final int restoreCount = canvas.save();
1.3216 + final int height = getHeight() - getPaddingTop() - getPaddingBottom();
1.3217 +
1.3218 + canvas.translate(0, height);
1.3219 + canvas.rotate(270);
1.3220 +
1.3221 + final boolean needsInvalidate = mStartEdge.draw(canvas);
1.3222 + canvas.restoreToCount(restoreCount);
1.3223 + return needsInvalidate;
1.3224 + }
1.3225 +
1.3226 + private boolean drawEndEdge(Canvas canvas) {
1.3227 + if (mEndEdge.isFinished()) {
1.3228 + return false;
1.3229 + }
1.3230 +
1.3231 + final int restoreCount = canvas.save();
1.3232 + final int width = getWidth() - getPaddingLeft() - getPaddingRight();
1.3233 + final int height = getHeight() - getPaddingTop() - getPaddingBottom();
1.3234 +
1.3235 + if (mIsVertical) {
1.3236 + canvas.translate(-width, height);
1.3237 + canvas.rotate(180, width, 0);
1.3238 + } else {
1.3239 + canvas.translate(width, 0);
1.3240 + canvas.rotate(90);
1.3241 + }
1.3242 +
1.3243 + final boolean needsInvalidate = mEndEdge.draw(canvas);
1.3244 + canvas.restoreToCount(restoreCount);
1.3245 + return needsInvalidate;
1.3246 + }
1.3247 +
1.3248 + private void drawSelector(Canvas canvas) {
1.3249 + if (!mSelectorRect.isEmpty()) {
1.3250 + final Drawable selector = mSelector;
1.3251 + selector.setBounds(mSelectorRect);
1.3252 + selector.draw(canvas);
1.3253 + }
1.3254 + }
1.3255 +
1.3256 + private void useDefaultSelector() {
1.3257 + setSelector(getResources().getDrawable(
1.3258 + android.R.drawable.list_selector_background));
1.3259 + }
1.3260 +
1.3261 + private boolean shouldShowSelector() {
1.3262 + return (hasFocus() && !isInTouchMode()) || touchModeDrawsInPressedState();
1.3263 + }
1.3264 +
1.3265 + private void positionSelector(int position, View selected) {
1.3266 + if (position != INVALID_POSITION) {
1.3267 + mSelectorPosition = position;
1.3268 + }
1.3269 +
1.3270 + mSelectorRect.set(selected.getLeft(), selected.getTop(), selected.getRight(),
1.3271 + selected.getBottom());
1.3272 +
1.3273 + final boolean isChildViewEnabled = mIsChildViewEnabled;
1.3274 + if (selected.isEnabled() != isChildViewEnabled) {
1.3275 + mIsChildViewEnabled = !isChildViewEnabled;
1.3276 +
1.3277 + if (getSelectedItemPosition() != INVALID_POSITION) {
1.3278 + refreshDrawableState();
1.3279 + }
1.3280 + }
1.3281 + }
1.3282 +
1.3283 + private void hideSelector() {
1.3284 + if (mSelectedPosition != INVALID_POSITION) {
1.3285 + if (mLayoutMode != LAYOUT_SPECIFIC) {
1.3286 + mResurrectToPosition = mSelectedPosition;
1.3287 + }
1.3288 +
1.3289 + if (mNextSelectedPosition >= 0 && mNextSelectedPosition != mSelectedPosition) {
1.3290 + mResurrectToPosition = mNextSelectedPosition;
1.3291 + }
1.3292 +
1.3293 + setSelectedPositionInt(INVALID_POSITION);
1.3294 + setNextSelectedPositionInt(INVALID_POSITION);
1.3295 +
1.3296 + mSelectedStart = 0;
1.3297 + }
1.3298 + }
1.3299 +
1.3300 + private void setSelectedPositionInt(int position) {
1.3301 + mSelectedPosition = position;
1.3302 + mSelectedRowId = getItemIdAtPosition(position);
1.3303 + }
1.3304 +
1.3305 + private void setSelectionInt(int position) {
1.3306 + setNextSelectedPositionInt(position);
1.3307 + boolean awakeScrollbars = false;
1.3308 +
1.3309 + final int selectedPosition = mSelectedPosition;
1.3310 + if (selectedPosition >= 0) {
1.3311 + if (position == selectedPosition - 1) {
1.3312 + awakeScrollbars = true;
1.3313 + } else if (position == selectedPosition + 1) {
1.3314 + awakeScrollbars = true;
1.3315 + }
1.3316 + }
1.3317 +
1.3318 + layoutChildren();
1.3319 +
1.3320 + if (awakeScrollbars) {
1.3321 + awakenScrollbarsInternal();
1.3322 + }
1.3323 + }
1.3324 +
1.3325 + private void setNextSelectedPositionInt(int position) {
1.3326 + mNextSelectedPosition = position;
1.3327 + mNextSelectedRowId = getItemIdAtPosition(position);
1.3328 +
1.3329 + // If we are trying to sync to the selection, update that too
1.3330 + if (mNeedSync && mSyncMode == SYNC_SELECTED_POSITION && position >= 0) {
1.3331 + mSyncPosition = position;
1.3332 + mSyncRowId = mNextSelectedRowId;
1.3333 + }
1.3334 + }
1.3335 +
1.3336 + private boolean touchModeDrawsInPressedState() {
1.3337 + switch (mTouchMode) {
1.3338 + case TOUCH_MODE_TAP:
1.3339 + case TOUCH_MODE_DONE_WAITING:
1.3340 + return true;
1.3341 + default:
1.3342 + return false;
1.3343 + }
1.3344 + }
1.3345 +
1.3346 + /**
1.3347 + * Sets the selector state to "pressed" and posts a CheckForKeyLongPress to see if
1.3348 + * this is a long press.
1.3349 + */
1.3350 + private void keyPressed() {
1.3351 + if (!isEnabled() || !isClickable()) {
1.3352 + return;
1.3353 + }
1.3354 +
1.3355 + final Drawable selector = mSelector;
1.3356 + final Rect selectorRect = mSelectorRect;
1.3357 +
1.3358 + if (selector != null && (isFocused() || touchModeDrawsInPressedState())
1.3359 + && !selectorRect.isEmpty()) {
1.3360 +
1.3361 + final View child = getChildAt(mSelectedPosition - mFirstPosition);
1.3362 +
1.3363 + if (child != null) {
1.3364 + if (child.hasFocusable()) {
1.3365 + return;
1.3366 + }
1.3367 +
1.3368 + child.setPressed(true);
1.3369 + }
1.3370 +
1.3371 + setPressed(true);
1.3372 +
1.3373 + final boolean longClickable = isLongClickable();
1.3374 + final Drawable d = selector.getCurrent();
1.3375 + if (d != null && d instanceof TransitionDrawable) {
1.3376 + if (longClickable) {
1.3377 + ((TransitionDrawable) d).startTransition(
1.3378 + ViewConfiguration.getLongPressTimeout());
1.3379 + } else {
1.3380 + ((TransitionDrawable) d).resetTransition();
1.3381 + }
1.3382 + }
1.3383 +
1.3384 + if (longClickable && !mDataChanged) {
1.3385 + if (mPendingCheckForKeyLongPress == null) {
1.3386 + mPendingCheckForKeyLongPress = new CheckForKeyLongPress();
1.3387 + }
1.3388 +
1.3389 + mPendingCheckForKeyLongPress.rememberWindowAttachCount();
1.3390 + postDelayed(mPendingCheckForKeyLongPress, ViewConfiguration.getLongPressTimeout());
1.3391 + }
1.3392 + }
1.3393 + }
1.3394 +
1.3395 + private void updateSelectorState() {
1.3396 + if (mSelector != null) {
1.3397 + if (shouldShowSelector()) {
1.3398 + mSelector.setState(getDrawableState());
1.3399 + } else {
1.3400 + mSelector.setState(STATE_NOTHING);
1.3401 + }
1.3402 + }
1.3403 + }
1.3404 +
1.3405 + private void checkSelectionChanged() {
1.3406 + if ((mSelectedPosition != mOldSelectedPosition) || (mSelectedRowId != mOldSelectedRowId)) {
1.3407 + selectionChanged();
1.3408 + mOldSelectedPosition = mSelectedPosition;
1.3409 + mOldSelectedRowId = mSelectedRowId;
1.3410 + }
1.3411 + }
1.3412 +
1.3413 + private void selectionChanged() {
1.3414 + OnItemSelectedListener listener = getOnItemSelectedListener();
1.3415 + if (listener == null) {
1.3416 + return;
1.3417 + }
1.3418 +
1.3419 + if (mInLayout || mBlockLayoutRequests) {
1.3420 + // If we are in a layout traversal, defer notification
1.3421 + // by posting. This ensures that the view tree is
1.3422 + // in a consistent state and is able to accommodate
1.3423 + // new layout or invalidate requests.
1.3424 + if (mSelectionNotifier == null) {
1.3425 + mSelectionNotifier = new SelectionNotifier();
1.3426 + }
1.3427 +
1.3428 + post(mSelectionNotifier);
1.3429 + } else {
1.3430 + fireOnSelected();
1.3431 + performAccessibilityActionsOnSelected();
1.3432 + }
1.3433 + }
1.3434 +
1.3435 + private void fireOnSelected() {
1.3436 + OnItemSelectedListener listener = getOnItemSelectedListener();
1.3437 + if (listener == null) {
1.3438 + return;
1.3439 + }
1.3440 +
1.3441 + final int selection = getSelectedItemPosition();
1.3442 + if (selection >= 0) {
1.3443 + View v = getSelectedView();
1.3444 + listener.onItemSelected(this, v, selection,
1.3445 + mAdapter.getItemId(selection));
1.3446 + } else {
1.3447 + listener.onNothingSelected(this);
1.3448 + }
1.3449 + }
1.3450 +
1.3451 + private void performAccessibilityActionsOnSelected() {
1.3452 + final int position = getSelectedItemPosition();
1.3453 + if (position >= 0) {
1.3454 + // We fire selection events here not in View
1.3455 + sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SELECTED);
1.3456 + }
1.3457 + }
1.3458 +
1.3459 + private int lookForSelectablePosition(int position) {
1.3460 + return lookForSelectablePosition(position, true);
1.3461 + }
1.3462 +
1.3463 + private int lookForSelectablePosition(int position, boolean lookDown) {
1.3464 + final ListAdapter adapter = mAdapter;
1.3465 + if (adapter == null || isInTouchMode()) {
1.3466 + return INVALID_POSITION;
1.3467 + }
1.3468 +
1.3469 + final int itemCount = mItemCount;
1.3470 + if (!mAreAllItemsSelectable) {
1.3471 + if (lookDown) {
1.3472 + position = Math.max(0, position);
1.3473 + while (position < itemCount && !adapter.isEnabled(position)) {
1.3474 + position++;
1.3475 + }
1.3476 + } else {
1.3477 + position = Math.min(position, itemCount - 1);
1.3478 + while (position >= 0 && !adapter.isEnabled(position)) {
1.3479 + position--;
1.3480 + }
1.3481 + }
1.3482 +
1.3483 + if (position < 0 || position >= itemCount) {
1.3484 + return INVALID_POSITION;
1.3485 + }
1.3486 +
1.3487 + return position;
1.3488 + } else {
1.3489 + if (position < 0 || position >= itemCount) {
1.3490 + return INVALID_POSITION;
1.3491 + }
1.3492 +
1.3493 + return position;
1.3494 + }
1.3495 + }
1.3496 +
1.3497 + /**
1.3498 + * @param direction either {@link View#FOCUS_UP} or {@link View#FOCUS_DOWN} or
1.3499 + * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT} depending on the
1.3500 + * current view orientation.
1.3501 + *
1.3502 + * @return The position of the next selectable position of the views that
1.3503 + * are currently visible, taking into account the fact that there might
1.3504 + * be no selection. Returns {@link #INVALID_POSITION} if there is no
1.3505 + * selectable view on screen in the given direction.
1.3506 + */
1.3507 + private int lookForSelectablePositionOnScreen(int direction) {
1.3508 + forceValidFocusDirection(direction);
1.3509 +
1.3510 + final int firstPosition = mFirstPosition;
1.3511 + final ListAdapter adapter = getAdapter();
1.3512 +
1.3513 + if (direction == View.FOCUS_DOWN || direction == View.FOCUS_RIGHT) {
1.3514 + int startPos = (mSelectedPosition != INVALID_POSITION ?
1.3515 + mSelectedPosition + 1 : firstPosition);
1.3516 +
1.3517 + if (startPos >= adapter.getCount()) {
1.3518 + return INVALID_POSITION;
1.3519 + }
1.3520 +
1.3521 + if (startPos < firstPosition) {
1.3522 + startPos = firstPosition;
1.3523 + }
1.3524 +
1.3525 + final int lastVisiblePos = getLastVisiblePosition();
1.3526 +
1.3527 + for (int pos = startPos; pos <= lastVisiblePos; pos++) {
1.3528 + if (adapter.isEnabled(pos)
1.3529 + && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) {
1.3530 + return pos;
1.3531 + }
1.3532 + }
1.3533 + } else {
1.3534 + final int last = firstPosition + getChildCount() - 1;
1.3535 +
1.3536 + int startPos = (mSelectedPosition != INVALID_POSITION) ?
1.3537 + mSelectedPosition - 1 : firstPosition + getChildCount() - 1;
1.3538 +
1.3539 + if (startPos < 0 || startPos >= adapter.getCount()) {
1.3540 + return INVALID_POSITION;
1.3541 + }
1.3542 +
1.3543 + if (startPos > last) {
1.3544 + startPos = last;
1.3545 + }
1.3546 +
1.3547 + for (int pos = startPos; pos >= firstPosition; pos--) {
1.3548 + if (adapter.isEnabled(pos)
1.3549 + && getChildAt(pos - firstPosition).getVisibility() == View.VISIBLE) {
1.3550 + return pos;
1.3551 + }
1.3552 + }
1.3553 + }
1.3554 +
1.3555 + return INVALID_POSITION;
1.3556 + }
1.3557 +
1.3558 + @Override
1.3559 + protected void drawableStateChanged() {
1.3560 + super.drawableStateChanged();
1.3561 + updateSelectorState();
1.3562 + }
1.3563 +
1.3564 + @Override
1.3565 + protected int[] onCreateDrawableState(int extraSpace) {
1.3566 + // If the child view is enabled then do the default behavior.
1.3567 + if (mIsChildViewEnabled) {
1.3568 + // Common case
1.3569 + return super.onCreateDrawableState(extraSpace);
1.3570 + }
1.3571 +
1.3572 + // The selector uses this View's drawable state. The selected child view
1.3573 + // is disabled, so we need to remove the enabled state from the drawable
1.3574 + // states.
1.3575 + final int enabledState = ENABLED_STATE_SET[0];
1.3576 +
1.3577 + // If we don't have any extra space, it will return one of the static state arrays,
1.3578 + // and clearing the enabled state on those arrays is a bad thing! If we specify
1.3579 + // we need extra space, it will create+copy into a new array that safely mutable.
1.3580 + int[] state = super.onCreateDrawableState(extraSpace + 1);
1.3581 + int enabledPos = -1;
1.3582 + for (int i = state.length - 1; i >= 0; i--) {
1.3583 + if (state[i] == enabledState) {
1.3584 + enabledPos = i;
1.3585 + break;
1.3586 + }
1.3587 + }
1.3588 +
1.3589 + // Remove the enabled state
1.3590 + if (enabledPos >= 0) {
1.3591 + System.arraycopy(state, enabledPos + 1, state, enabledPos,
1.3592 + state.length - enabledPos - 1);
1.3593 + }
1.3594 +
1.3595 + return state;
1.3596 + }
1.3597 +
1.3598 + @Override
1.3599 + protected boolean canAnimate() {
1.3600 + return (super.canAnimate() && mItemCount > 0);
1.3601 + }
1.3602 +
1.3603 + @Override
1.3604 + protected void dispatchDraw(Canvas canvas) {
1.3605 + final boolean drawSelectorOnTop = mDrawSelectorOnTop;
1.3606 + if (!drawSelectorOnTop) {
1.3607 + drawSelector(canvas);
1.3608 + }
1.3609 +
1.3610 + super.dispatchDraw(canvas);
1.3611 +
1.3612 + if (drawSelectorOnTop) {
1.3613 + drawSelector(canvas);
1.3614 + }
1.3615 + }
1.3616 +
1.3617 + @Override
1.3618 + public void draw(Canvas canvas) {
1.3619 + super.draw(canvas);
1.3620 +
1.3621 + boolean needsInvalidate = false;
1.3622 +
1.3623 + if (mStartEdge != null) {
1.3624 + needsInvalidate |= drawStartEdge(canvas);
1.3625 + }
1.3626 +
1.3627 + if (mEndEdge != null) {
1.3628 + needsInvalidate |= drawEndEdge(canvas);
1.3629 + }
1.3630 +
1.3631 + if (needsInvalidate) {
1.3632 + ViewCompat.postInvalidateOnAnimation(this);
1.3633 + }
1.3634 + }
1.3635 +
1.3636 + @Override
1.3637 + public void requestLayout() {
1.3638 + if (!mInLayout && !mBlockLayoutRequests) {
1.3639 + super.requestLayout();
1.3640 + }
1.3641 + }
1.3642 +
1.3643 + @Override
1.3644 + public View getSelectedView() {
1.3645 + if (mItemCount > 0 && mSelectedPosition >= 0) {
1.3646 + return getChildAt(mSelectedPosition - mFirstPosition);
1.3647 + } else {
1.3648 + return null;
1.3649 + }
1.3650 + }
1.3651 +
1.3652 + @Override
1.3653 + public void setSelection(int position) {
1.3654 + setSelectionFromOffset(position, 0);
1.3655 + }
1.3656 +
1.3657 + public void setSelectionFromOffset(int position, int offset) {
1.3658 + if (mAdapter == null) {
1.3659 + return;
1.3660 + }
1.3661 +
1.3662 + if (!isInTouchMode()) {
1.3663 + position = lookForSelectablePosition(position);
1.3664 + if (position >= 0) {
1.3665 + setNextSelectedPositionInt(position);
1.3666 + }
1.3667 + } else {
1.3668 + mResurrectToPosition = position;
1.3669 + }
1.3670 +
1.3671 + if (position >= 0) {
1.3672 + mLayoutMode = LAYOUT_SPECIFIC;
1.3673 +
1.3674 + if (mIsVertical) {
1.3675 + mSpecificStart = getPaddingTop() + offset;
1.3676 + } else {
1.3677 + mSpecificStart = getPaddingLeft() + offset;
1.3678 + }
1.3679 +
1.3680 + if (mNeedSync) {
1.3681 + mSyncPosition = position;
1.3682 + mSyncRowId = mAdapter.getItemId(position);
1.3683 + }
1.3684 +
1.3685 + requestLayout();
1.3686 + }
1.3687 + }
1.3688 +
1.3689 + @Override
1.3690 + public boolean dispatchKeyEvent(KeyEvent event) {
1.3691 + // Dispatch in the normal way
1.3692 + boolean handled = super.dispatchKeyEvent(event);
1.3693 + if (!handled) {
1.3694 + // If we didn't handle it...
1.3695 + final View focused = getFocusedChild();
1.3696 + if (focused != null && event.getAction() == KeyEvent.ACTION_DOWN) {
1.3697 + // ... and our focused child didn't handle it
1.3698 + // ... give it to ourselves so we can scroll if necessary
1.3699 + handled = onKeyDown(event.getKeyCode(), event);
1.3700 + }
1.3701 + }
1.3702 +
1.3703 + return handled;
1.3704 + }
1.3705 +
1.3706 + @Override
1.3707 + protected void dispatchSetPressed(boolean pressed) {
1.3708 + // Don't dispatch setPressed to our children. We call setPressed on ourselves to
1.3709 + // get the selector in the right state, but we don't want to press each child.
1.3710 + }
1.3711 +
1.3712 + @Override
1.3713 + protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
1.3714 + if (mSelector == null) {
1.3715 + useDefaultSelector();
1.3716 + }
1.3717 +
1.3718 + int widthMode = MeasureSpec.getMode(widthMeasureSpec);
1.3719 + int heightMode = MeasureSpec.getMode(heightMeasureSpec);
1.3720 + int widthSize = MeasureSpec.getSize(widthMeasureSpec);
1.3721 + int heightSize = MeasureSpec.getSize(heightMeasureSpec);
1.3722 +
1.3723 + int childWidth = 0;
1.3724 + int childHeight = 0;
1.3725 +
1.3726 + mItemCount = (mAdapter == null ? 0 : mAdapter.getCount());
1.3727 + if (mItemCount > 0 && (widthMode == MeasureSpec.UNSPECIFIED ||
1.3728 + heightMode == MeasureSpec.UNSPECIFIED)) {
1.3729 + final View child = obtainView(0, mIsScrap);
1.3730 +
1.3731 + final int secondaryMeasureSpec =
1.3732 + (mIsVertical ? widthMeasureSpec : heightMeasureSpec);
1.3733 +
1.3734 + measureScrapChild(child, 0, secondaryMeasureSpec);
1.3735 +
1.3736 + childWidth = child.getMeasuredWidth();
1.3737 + childHeight = child.getMeasuredHeight();
1.3738 +
1.3739 + if (recycleOnMeasure()) {
1.3740 + mRecycler.addScrapView(child, -1);
1.3741 + }
1.3742 + }
1.3743 +
1.3744 + if (widthMode == MeasureSpec.UNSPECIFIED) {
1.3745 + widthSize = getPaddingLeft() + getPaddingRight() + childWidth;
1.3746 + if (mIsVertical) {
1.3747 + widthSize += getVerticalScrollbarWidth();
1.3748 + }
1.3749 + }
1.3750 +
1.3751 + if (heightMode == MeasureSpec.UNSPECIFIED) {
1.3752 + heightSize = getPaddingTop() + getPaddingBottom() + childHeight;
1.3753 + if (!mIsVertical) {
1.3754 + heightSize += getHorizontalScrollbarHeight();
1.3755 + }
1.3756 + }
1.3757 +
1.3758 + if (mIsVertical && heightMode == MeasureSpec.AT_MOST) {
1.3759 + heightSize = measureHeightOfChildren(widthMeasureSpec, 0, NO_POSITION, heightSize, -1);
1.3760 + }
1.3761 +
1.3762 + if (!mIsVertical && widthMode == MeasureSpec.AT_MOST) {
1.3763 + widthSize = measureWidthOfChildren(heightMeasureSpec, 0, NO_POSITION, widthSize, -1);
1.3764 + }
1.3765 +
1.3766 + setMeasuredDimension(widthSize, heightSize);
1.3767 + }
1.3768 +
1.3769 + @Override
1.3770 + protected void onLayout(boolean changed, int l, int t, int r, int b) {
1.3771 + mInLayout = true;
1.3772 +
1.3773 + if (changed) {
1.3774 + final int childCount = getChildCount();
1.3775 + for (int i = 0; i < childCount; i++) {
1.3776 + getChildAt(i).forceLayout();
1.3777 + }
1.3778 +
1.3779 + mRecycler.markChildrenDirty();
1.3780 + }
1.3781 +
1.3782 + layoutChildren();
1.3783 +
1.3784 + mInLayout = false;
1.3785 +
1.3786 + final int width = r - l - getPaddingLeft() - getPaddingRight();
1.3787 + final int height = b - t - getPaddingTop() - getPaddingBottom();
1.3788 +
1.3789 + if (mStartEdge != null && mEndEdge != null) {
1.3790 + if (mIsVertical) {
1.3791 + mStartEdge.setSize(width, height);
1.3792 + mEndEdge.setSize(width, height);
1.3793 + } else {
1.3794 + mStartEdge.setSize(height, width);
1.3795 + mEndEdge.setSize(height, width);
1.3796 + }
1.3797 + }
1.3798 + }
1.3799 +
1.3800 + private void layoutChildren() {
1.3801 + if (getWidth() == 0 || getHeight() == 0) {
1.3802 + return;
1.3803 + }
1.3804 +
1.3805 + final boolean blockLayoutRequests = mBlockLayoutRequests;
1.3806 + if (!blockLayoutRequests) {
1.3807 + mBlockLayoutRequests = true;
1.3808 + } else {
1.3809 + return;
1.3810 + }
1.3811 +
1.3812 + try {
1.3813 + invalidate();
1.3814 +
1.3815 + if (mAdapter == null) {
1.3816 + resetState();
1.3817 + return;
1.3818 + }
1.3819 +
1.3820 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.3821 + final int end =
1.3822 + (mIsVertical ? getHeight() - getPaddingBottom() : getWidth() - getPaddingRight());
1.3823 +
1.3824 + int childCount = getChildCount();
1.3825 + int index = 0;
1.3826 + int delta = 0;
1.3827 +
1.3828 + View focusLayoutRestoreView = null;
1.3829 +
1.3830 + View selected = null;
1.3831 + View oldSelected = null;
1.3832 + View newSelected = null;
1.3833 + View oldFirstChild = null;
1.3834 +
1.3835 + switch (mLayoutMode) {
1.3836 + case LAYOUT_SET_SELECTION:
1.3837 + index = mNextSelectedPosition - mFirstPosition;
1.3838 + if (index >= 0 && index < childCount) {
1.3839 + newSelected = getChildAt(index);
1.3840 + }
1.3841 +
1.3842 + break;
1.3843 +
1.3844 + case LAYOUT_FORCE_TOP:
1.3845 + case LAYOUT_FORCE_BOTTOM:
1.3846 + case LAYOUT_SPECIFIC:
1.3847 + case LAYOUT_SYNC:
1.3848 + break;
1.3849 +
1.3850 + case LAYOUT_MOVE_SELECTION:
1.3851 + default:
1.3852 + // Remember the previously selected view
1.3853 + index = mSelectedPosition - mFirstPosition;
1.3854 + if (index >= 0 && index < childCount) {
1.3855 + oldSelected = getChildAt(index);
1.3856 + }
1.3857 +
1.3858 + // Remember the previous first child
1.3859 + oldFirstChild = getChildAt(0);
1.3860 +
1.3861 + if (mNextSelectedPosition >= 0) {
1.3862 + delta = mNextSelectedPosition - mSelectedPosition;
1.3863 + }
1.3864 +
1.3865 + // Caution: newSelected might be null
1.3866 + newSelected = getChildAt(index + delta);
1.3867 + }
1.3868 +
1.3869 + final boolean dataChanged = mDataChanged;
1.3870 + if (dataChanged) {
1.3871 + handleDataChanged();
1.3872 + }
1.3873 +
1.3874 + // Handle the empty set by removing all views that are visible
1.3875 + // and calling it a day
1.3876 + if (mItemCount == 0) {
1.3877 + resetState();
1.3878 + return;
1.3879 + } else if (mItemCount != mAdapter.getCount()) {
1.3880 + throw new IllegalStateException("The content of the adapter has changed but "
1.3881 + + "TwoWayView did not receive a notification. Make sure the content of "
1.3882 + + "your adapter is not modified from a background thread, but only "
1.3883 + + "from the UI thread. [in TwoWayView(" + getId() + ", " + getClass()
1.3884 + + ") with Adapter(" + mAdapter.getClass() + ")]");
1.3885 + }
1.3886 +
1.3887 + setSelectedPositionInt(mNextSelectedPosition);
1.3888 +
1.3889 + // Reset the focus restoration
1.3890 + View focusLayoutRestoreDirectChild = null;
1.3891 +
1.3892 + // Pull all children into the RecycleBin.
1.3893 + // These views will be reused if possible
1.3894 + final int firstPosition = mFirstPosition;
1.3895 + final RecycleBin recycleBin = mRecycler;
1.3896 +
1.3897 + if (dataChanged) {
1.3898 + for (int i = 0; i < childCount; i++) {
1.3899 + recycleBin.addScrapView(getChildAt(i), firstPosition + i);
1.3900 + }
1.3901 + } else {
1.3902 + recycleBin.fillActiveViews(childCount, firstPosition);
1.3903 + }
1.3904 +
1.3905 + // Take focus back to us temporarily to avoid the eventual
1.3906 + // call to clear focus when removing the focused child below
1.3907 + // from messing things up when ViewAncestor assigns focus back
1.3908 + // to someone else.
1.3909 + final View focusedChild = getFocusedChild();
1.3910 + if (focusedChild != null) {
1.3911 + // We can remember the focused view to restore after relayout if the
1.3912 + // data hasn't changed, or if the focused position is a header or footer.
1.3913 + if (!dataChanged) {
1.3914 + focusLayoutRestoreDirectChild = focusedChild;
1.3915 +
1.3916 + // Remember the specific view that had focus
1.3917 + focusLayoutRestoreView = findFocus();
1.3918 + if (focusLayoutRestoreView != null) {
1.3919 + // Tell it we are going to mess with it
1.3920 + focusLayoutRestoreView.onStartTemporaryDetach();
1.3921 + }
1.3922 + }
1.3923 +
1.3924 + requestFocus();
1.3925 + }
1.3926 +
1.3927 + // FIXME: We need a way to save current accessibility focus here
1.3928 + // so that it can be restored after we re-attach the children on each
1.3929 + // layout round.
1.3930 +
1.3931 + detachAllViewsFromParent();
1.3932 +
1.3933 + switch (mLayoutMode) {
1.3934 + case LAYOUT_SET_SELECTION:
1.3935 + if (newSelected != null) {
1.3936 + final int newSelectedStart =
1.3937 + (mIsVertical ? newSelected.getTop() : newSelected.getLeft());
1.3938 +
1.3939 + selected = fillFromSelection(newSelectedStart, start, end);
1.3940 + } else {
1.3941 + selected = fillFromMiddle(start, end);
1.3942 + }
1.3943 +
1.3944 + break;
1.3945 +
1.3946 + case LAYOUT_SYNC:
1.3947 + selected = fillSpecific(mSyncPosition, mSpecificStart);
1.3948 + break;
1.3949 +
1.3950 + case LAYOUT_FORCE_BOTTOM:
1.3951 + selected = fillBefore(mItemCount - 1, end);
1.3952 + adjustViewsStartOrEnd();
1.3953 + break;
1.3954 +
1.3955 + case LAYOUT_FORCE_TOP:
1.3956 + mFirstPosition = 0;
1.3957 + selected = fillFromOffset(start);
1.3958 + adjustViewsStartOrEnd();
1.3959 + break;
1.3960 +
1.3961 + case LAYOUT_SPECIFIC:
1.3962 + selected = fillSpecific(reconcileSelectedPosition(), mSpecificStart);
1.3963 + break;
1.3964 +
1.3965 + case LAYOUT_MOVE_SELECTION:
1.3966 + selected = moveSelection(oldSelected, newSelected, delta, start, end);
1.3967 + break;
1.3968 +
1.3969 + default:
1.3970 + if (childCount == 0) {
1.3971 + final int position = lookForSelectablePosition(0);
1.3972 + setSelectedPositionInt(position);
1.3973 + selected = fillFromOffset(start);
1.3974 + } else {
1.3975 + if (mSelectedPosition >= 0 && mSelectedPosition < mItemCount) {
1.3976 + int offset = start;
1.3977 + if (oldSelected != null) {
1.3978 + offset = (mIsVertical ? oldSelected.getTop() : oldSelected.getLeft());
1.3979 + }
1.3980 + selected = fillSpecific(mSelectedPosition, offset);
1.3981 + } else if (mFirstPosition < mItemCount) {
1.3982 + int offset = start;
1.3983 + if (oldFirstChild != null) {
1.3984 + offset = (mIsVertical ? oldFirstChild.getTop() : oldFirstChild.getLeft());
1.3985 + }
1.3986 +
1.3987 + selected = fillSpecific(mFirstPosition, offset);
1.3988 + } else {
1.3989 + selected = fillSpecific(0, start);
1.3990 + }
1.3991 + }
1.3992 +
1.3993 + break;
1.3994 +
1.3995 + }
1.3996 +
1.3997 + recycleBin.scrapActiveViews();
1.3998 +
1.3999 + if (selected != null) {
1.4000 + if (mItemsCanFocus && hasFocus() && !selected.hasFocus()) {
1.4001 + final boolean focusWasTaken = (selected == focusLayoutRestoreDirectChild &&
1.4002 + focusLayoutRestoreView != null &&
1.4003 + focusLayoutRestoreView.requestFocus()) || selected.requestFocus();
1.4004 +
1.4005 + if (!focusWasTaken) {
1.4006 + // Selected item didn't take focus, fine, but still want
1.4007 + // to make sure something else outside of the selected view
1.4008 + // has focus
1.4009 + final View focused = getFocusedChild();
1.4010 + if (focused != null) {
1.4011 + focused.clearFocus();
1.4012 + }
1.4013 +
1.4014 + positionSelector(INVALID_POSITION, selected);
1.4015 + } else {
1.4016 + selected.setSelected(false);
1.4017 + mSelectorRect.setEmpty();
1.4018 + }
1.4019 + } else {
1.4020 + positionSelector(INVALID_POSITION, selected);
1.4021 + }
1.4022 +
1.4023 + mSelectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.4024 + } else {
1.4025 + if (mTouchMode > TOUCH_MODE_DOWN && mTouchMode < TOUCH_MODE_DRAGGING) {
1.4026 + View child = getChildAt(mMotionPosition - mFirstPosition);
1.4027 +
1.4028 + if (child != null) {
1.4029 + positionSelector(mMotionPosition, child);
1.4030 + }
1.4031 + } else {
1.4032 + mSelectedStart = 0;
1.4033 + mSelectorRect.setEmpty();
1.4034 + }
1.4035 +
1.4036 + // Even if there is not selected position, we may need to restore
1.4037 + // focus (i.e. something focusable in touch mode)
1.4038 + if (hasFocus() && focusLayoutRestoreView != null) {
1.4039 + focusLayoutRestoreView.requestFocus();
1.4040 + }
1.4041 + }
1.4042 +
1.4043 + // Tell focus view we are done mucking with it, if it is still in
1.4044 + // our view hierarchy.
1.4045 + if (focusLayoutRestoreView != null
1.4046 + && focusLayoutRestoreView.getWindowToken() != null) {
1.4047 + focusLayoutRestoreView.onFinishTemporaryDetach();
1.4048 + }
1.4049 +
1.4050 + mLayoutMode = LAYOUT_NORMAL;
1.4051 + mDataChanged = false;
1.4052 + mNeedSync = false;
1.4053 +
1.4054 + setNextSelectedPositionInt(mSelectedPosition);
1.4055 + if (mItemCount > 0) {
1.4056 + checkSelectionChanged();
1.4057 + }
1.4058 +
1.4059 + invokeOnItemScrollListener();
1.4060 + } finally {
1.4061 + if (!blockLayoutRequests) {
1.4062 + mBlockLayoutRequests = false;
1.4063 + mDataChanged = false;
1.4064 + }
1.4065 + }
1.4066 + }
1.4067 +
1.4068 + protected boolean recycleOnMeasure() {
1.4069 + return true;
1.4070 + }
1.4071 +
1.4072 + private void offsetChildren(int offset) {
1.4073 + final int childCount = getChildCount();
1.4074 +
1.4075 + for (int i = 0; i < childCount; i++) {
1.4076 + final View child = getChildAt(i);
1.4077 +
1.4078 + if (mIsVertical) {
1.4079 + child.offsetTopAndBottom(offset);
1.4080 + } else {
1.4081 + child.offsetLeftAndRight(offset);
1.4082 + }
1.4083 + }
1.4084 + }
1.4085 +
1.4086 + private View moveSelection(View oldSelected, View newSelected, int delta, int start,
1.4087 + int end) {
1.4088 + final int selectedPosition = mSelectedPosition;
1.4089 +
1.4090 + final int oldSelectedStart = (mIsVertical ? oldSelected.getTop() : oldSelected.getLeft());
1.4091 + final int oldSelectedEnd = (mIsVertical ? oldSelected.getBottom() : oldSelected.getRight());
1.4092 +
1.4093 + View selected = null;
1.4094 +
1.4095 + if (delta > 0) {
1.4096 + /*
1.4097 + * Case 1: Scrolling down.
1.4098 + */
1.4099 +
1.4100 + /*
1.4101 + * Before After
1.4102 + * | | | |
1.4103 + * +-------+ +-------+
1.4104 + * | A | | A |
1.4105 + * | 1 | => +-------+
1.4106 + * +-------+ | B |
1.4107 + * | B | | 2 |
1.4108 + * +-------+ +-------+
1.4109 + * | | | |
1.4110 + *
1.4111 + * Try to keep the top of the previously selected item where it was.
1.4112 + * oldSelected = A
1.4113 + * selected = B
1.4114 + */
1.4115 +
1.4116 + // Put oldSelected (A) where it belongs
1.4117 + oldSelected = makeAndAddView(selectedPosition - 1, oldSelectedStart, true, false);
1.4118 +
1.4119 + final int itemMargin = mItemMargin;
1.4120 +
1.4121 + // Now put the new selection (B) below that
1.4122 + selected = makeAndAddView(selectedPosition, oldSelectedEnd + itemMargin, true, true);
1.4123 +
1.4124 + final int selectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.4125 + final int selectedEnd = (mIsVertical ? selected.getBottom() : selected.getRight());
1.4126 +
1.4127 + // Some of the newly selected item extends below the bottom of the list
1.4128 + if (selectedEnd > end) {
1.4129 + // Find space available above the selection into which we can scroll upwards
1.4130 + final int spaceBefore = selectedStart - start;
1.4131 +
1.4132 + // Find space required to bring the bottom of the selected item fully into view
1.4133 + final int spaceAfter = selectedEnd - end;
1.4134 +
1.4135 + // Don't scroll more than half the size of the list
1.4136 + final int halfSpace = (end - start) / 2;
1.4137 + int offset = Math.min(spaceBefore, spaceAfter);
1.4138 + offset = Math.min(offset, halfSpace);
1.4139 +
1.4140 + if (mIsVertical) {
1.4141 + oldSelected.offsetTopAndBottom(-offset);
1.4142 + selected.offsetTopAndBottom(-offset);
1.4143 + } else {
1.4144 + oldSelected.offsetLeftAndRight(-offset);
1.4145 + selected.offsetLeftAndRight(-offset);
1.4146 + }
1.4147 + }
1.4148 +
1.4149 + // Fill in views before and after
1.4150 + fillBefore(mSelectedPosition - 2, selectedStart - itemMargin);
1.4151 + adjustViewsStartOrEnd();
1.4152 + fillAfter(mSelectedPosition + 1, selectedEnd + itemMargin);
1.4153 + } else if (delta < 0) {
1.4154 + /*
1.4155 + * Case 2: Scrolling up.
1.4156 + */
1.4157 +
1.4158 + /*
1.4159 + * Before After
1.4160 + * | | | |
1.4161 + * +-------+ +-------+
1.4162 + * | A | | A |
1.4163 + * +-------+ => | 1 |
1.4164 + * | B | +-------+
1.4165 + * | 2 | | B |
1.4166 + * +-------+ +-------+
1.4167 + * | | | |
1.4168 + *
1.4169 + * Try to keep the top of the item about to become selected where it was.
1.4170 + * newSelected = A
1.4171 + * olSelected = B
1.4172 + */
1.4173 +
1.4174 + if (newSelected != null) {
1.4175 + // Try to position the top of newSel (A) where it was before it was selected
1.4176 + final int newSelectedStart = (mIsVertical ? newSelected.getTop() : newSelected.getLeft());
1.4177 + selected = makeAndAddView(selectedPosition, newSelectedStart, true, true);
1.4178 + } else {
1.4179 + // If (A) was not on screen and so did not have a view, position
1.4180 + // it above the oldSelected (B)
1.4181 + selected = makeAndAddView(selectedPosition, oldSelectedStart, false, true);
1.4182 + }
1.4183 +
1.4184 + final int selectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.4185 + final int selectedEnd = (mIsVertical ? selected.getBottom() : selected.getRight());
1.4186 +
1.4187 + // Some of the newly selected item extends above the top of the list
1.4188 + if (selectedStart < start) {
1.4189 + // Find space required to bring the top of the selected item fully into view
1.4190 + final int spaceBefore = start - selectedStart;
1.4191 +
1.4192 + // Find space available below the selection into which we can scroll downwards
1.4193 + final int spaceAfter = end - selectedEnd;
1.4194 +
1.4195 + // Don't scroll more than half the height of the list
1.4196 + final int halfSpace = (end - start) / 2;
1.4197 + int offset = Math.min(spaceBefore, spaceAfter);
1.4198 + offset = Math.min(offset, halfSpace);
1.4199 +
1.4200 + if (mIsVertical) {
1.4201 + selected.offsetTopAndBottom(offset);
1.4202 + } else {
1.4203 + selected.offsetLeftAndRight(offset);
1.4204 + }
1.4205 + }
1.4206 +
1.4207 + // Fill in views above and below
1.4208 + fillBeforeAndAfter(selected, selectedPosition);
1.4209 + } else {
1.4210 + /*
1.4211 + * Case 3: Staying still
1.4212 + */
1.4213 +
1.4214 + selected = makeAndAddView(selectedPosition, oldSelectedStart, true, true);
1.4215 +
1.4216 + final int selectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.4217 + final int selectedEnd = (mIsVertical ? selected.getBottom() : selected.getRight());
1.4218 +
1.4219 + // We're staying still...
1.4220 + if (oldSelectedStart < start) {
1.4221 + // ... but the top of the old selection was off screen.
1.4222 + // (This can happen if the data changes size out from under us)
1.4223 + int newEnd = selectedEnd;
1.4224 + if (newEnd < start + 20) {
1.4225 + // Not enough visible -- bring it onscreen
1.4226 + if (mIsVertical) {
1.4227 + selected.offsetTopAndBottom(start - selectedStart);
1.4228 + } else {
1.4229 + selected.offsetLeftAndRight(start - selectedStart);
1.4230 + }
1.4231 + }
1.4232 + }
1.4233 +
1.4234 + // Fill in views above and below
1.4235 + fillBeforeAndAfter(selected, selectedPosition);
1.4236 + }
1.4237 +
1.4238 + return selected;
1.4239 + }
1.4240 +
1.4241 + void confirmCheckedPositionsById() {
1.4242 + // Clear out the positional check states, we'll rebuild it below from IDs.
1.4243 + mCheckStates.clear();
1.4244 +
1.4245 + for (int checkedIndex = 0; checkedIndex < mCheckedIdStates.size(); checkedIndex++) {
1.4246 + final long id = mCheckedIdStates.keyAt(checkedIndex);
1.4247 + final int lastPos = mCheckedIdStates.valueAt(checkedIndex);
1.4248 +
1.4249 + final long lastPosId = mAdapter.getItemId(lastPos);
1.4250 + if (id != lastPosId) {
1.4251 + // Look around to see if the ID is nearby. If not, uncheck it.
1.4252 + final int start = Math.max(0, lastPos - CHECK_POSITION_SEARCH_DISTANCE);
1.4253 + final int end = Math.min(lastPos + CHECK_POSITION_SEARCH_DISTANCE, mItemCount);
1.4254 + boolean found = false;
1.4255 +
1.4256 + for (int searchPos = start; searchPos < end; searchPos++) {
1.4257 + final long searchId = mAdapter.getItemId(searchPos);
1.4258 + if (id == searchId) {
1.4259 + found = true;
1.4260 + mCheckStates.put(searchPos, true);
1.4261 + mCheckedIdStates.setValueAt(checkedIndex, searchPos);
1.4262 + break;
1.4263 + }
1.4264 + }
1.4265 +
1.4266 + if (!found) {
1.4267 + mCheckedIdStates.delete(id);
1.4268 + checkedIndex--;
1.4269 + mCheckedItemCount--;
1.4270 + }
1.4271 + } else {
1.4272 + mCheckStates.put(lastPos, true);
1.4273 + }
1.4274 + }
1.4275 + }
1.4276 +
1.4277 + private void handleDataChanged() {
1.4278 + if (mChoiceMode.compareTo(ChoiceMode.NONE) != 0 && mAdapter != null && mAdapter.hasStableIds()) {
1.4279 + confirmCheckedPositionsById();
1.4280 + }
1.4281 +
1.4282 + mRecycler.clearTransientStateViews();
1.4283 +
1.4284 + final int itemCount = mItemCount;
1.4285 + if (itemCount > 0) {
1.4286 + int newPos;
1.4287 + int selectablePos;
1.4288 +
1.4289 + // Find the row we are supposed to sync to
1.4290 + if (mNeedSync) {
1.4291 + // Update this first, since setNextSelectedPositionInt inspects it
1.4292 + mNeedSync = false;
1.4293 + mPendingSync = null;
1.4294 +
1.4295 + switch (mSyncMode) {
1.4296 + case SYNC_SELECTED_POSITION:
1.4297 + if (isInTouchMode()) {
1.4298 + // We saved our state when not in touch mode. (We know this because
1.4299 + // mSyncMode is SYNC_SELECTED_POSITION.) Now we are trying to
1.4300 + // restore in touch mode. Just leave mSyncPosition as it is (possibly
1.4301 + // adjusting if the available range changed) and return.
1.4302 + mLayoutMode = LAYOUT_SYNC;
1.4303 + mSyncPosition = Math.min(Math.max(0, mSyncPosition), itemCount - 1);
1.4304 +
1.4305 + return;
1.4306 + } else {
1.4307 + // See if we can find a position in the new data with the same
1.4308 + // id as the old selection. This will change mSyncPosition.
1.4309 + newPos = findSyncPosition();
1.4310 + if (newPos >= 0) {
1.4311 + // Found it. Now verify that new selection is still selectable
1.4312 + selectablePos = lookForSelectablePosition(newPos, true);
1.4313 + if (selectablePos == newPos) {
1.4314 + // Same row id is selected
1.4315 + mSyncPosition = newPos;
1.4316 +
1.4317 + if (mSyncHeight == getHeight()) {
1.4318 + // If we are at the same height as when we saved state, try
1.4319 + // to restore the scroll position too.
1.4320 + mLayoutMode = LAYOUT_SYNC;
1.4321 + } else {
1.4322 + // We are not the same height as when the selection was saved, so
1.4323 + // don't try to restore the exact position
1.4324 + mLayoutMode = LAYOUT_SET_SELECTION;
1.4325 + }
1.4326 +
1.4327 + // Restore selection
1.4328 + setNextSelectedPositionInt(newPos);
1.4329 + return;
1.4330 + }
1.4331 + }
1.4332 + }
1.4333 + break;
1.4334 +
1.4335 + case SYNC_FIRST_POSITION:
1.4336 + // Leave mSyncPosition as it is -- just pin to available range
1.4337 + mLayoutMode = LAYOUT_SYNC;
1.4338 + mSyncPosition = Math.min(Math.max(0, mSyncPosition), itemCount - 1);
1.4339 +
1.4340 + return;
1.4341 + }
1.4342 + }
1.4343 +
1.4344 + if (!isInTouchMode()) {
1.4345 + // We couldn't find matching data -- try to use the same position
1.4346 + newPos = getSelectedItemPosition();
1.4347 +
1.4348 + // Pin position to the available range
1.4349 + if (newPos >= itemCount) {
1.4350 + newPos = itemCount - 1;
1.4351 + }
1.4352 + if (newPos < 0) {
1.4353 + newPos = 0;
1.4354 + }
1.4355 +
1.4356 + // Make sure we select something selectable -- first look down
1.4357 + selectablePos = lookForSelectablePosition(newPos, true);
1.4358 +
1.4359 + if (selectablePos >= 0) {
1.4360 + setNextSelectedPositionInt(selectablePos);
1.4361 + return;
1.4362 + } else {
1.4363 + // Looking down didn't work -- try looking up
1.4364 + selectablePos = lookForSelectablePosition(newPos, false);
1.4365 + if (selectablePos >= 0) {
1.4366 + setNextSelectedPositionInt(selectablePos);
1.4367 + return;
1.4368 + }
1.4369 + }
1.4370 + } else {
1.4371 + // We already know where we want to resurrect the selection
1.4372 + if (mResurrectToPosition >= 0) {
1.4373 + return;
1.4374 + }
1.4375 + }
1.4376 + }
1.4377 +
1.4378 + // Nothing is selected. Give up and reset everything.
1.4379 + mLayoutMode = LAYOUT_FORCE_TOP;
1.4380 + mSelectedPosition = INVALID_POSITION;
1.4381 + mSelectedRowId = INVALID_ROW_ID;
1.4382 + mNextSelectedPosition = INVALID_POSITION;
1.4383 + mNextSelectedRowId = INVALID_ROW_ID;
1.4384 + mNeedSync = false;
1.4385 + mPendingSync = null;
1.4386 + mSelectorPosition = INVALID_POSITION;
1.4387 +
1.4388 + checkSelectionChanged();
1.4389 + }
1.4390 +
1.4391 + private int reconcileSelectedPosition() {
1.4392 + int position = mSelectedPosition;
1.4393 + if (position < 0) {
1.4394 + position = mResurrectToPosition;
1.4395 + }
1.4396 +
1.4397 + position = Math.max(0, position);
1.4398 + position = Math.min(position, mItemCount - 1);
1.4399 +
1.4400 + return position;
1.4401 + }
1.4402 +
1.4403 + boolean resurrectSelection() {
1.4404 + final int childCount = getChildCount();
1.4405 + if (childCount <= 0) {
1.4406 + return false;
1.4407 + }
1.4408 +
1.4409 + int selectedStart = 0;
1.4410 + int selectedPosition;
1.4411 +
1.4412 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.4413 + final int end =
1.4414 + (mIsVertical ? getHeight() - getPaddingBottom() : getWidth() - getPaddingRight());
1.4415 +
1.4416 + final int firstPosition = mFirstPosition;
1.4417 + final int toPosition = mResurrectToPosition;
1.4418 + boolean down = true;
1.4419 +
1.4420 + if (toPosition >= firstPosition && toPosition < firstPosition + childCount) {
1.4421 + selectedPosition = toPosition;
1.4422 +
1.4423 + final View selected = getChildAt(selectedPosition - mFirstPosition);
1.4424 + selectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.4425 + } else if (toPosition < firstPosition) {
1.4426 + // Default to selecting whatever is first
1.4427 + selectedPosition = firstPosition;
1.4428 +
1.4429 + for (int i = 0; i < childCount; i++) {
1.4430 + final View child = getChildAt(i);
1.4431 + final int childStart = (mIsVertical ? child.getTop() : child.getLeft());
1.4432 +
1.4433 + if (i == 0) {
1.4434 + // Remember the position of the first item
1.4435 + selectedStart = childStart;
1.4436 + }
1.4437 +
1.4438 + if (childStart >= start) {
1.4439 + // Found a view whose top is fully visible
1.4440 + selectedPosition = firstPosition + i;
1.4441 + selectedStart = childStart;
1.4442 + break;
1.4443 + }
1.4444 + }
1.4445 + } else {
1.4446 + selectedPosition = firstPosition + childCount - 1;
1.4447 + down = false;
1.4448 +
1.4449 + for (int i = childCount - 1; i >= 0; i--) {
1.4450 + final View child = getChildAt(i);
1.4451 + final int childStart = (mIsVertical ? child.getTop() : child.getLeft());
1.4452 + final int childEnd = (mIsVertical ? child.getBottom() : child.getRight());
1.4453 +
1.4454 + if (i == childCount - 1) {
1.4455 + selectedStart = childStart;
1.4456 + }
1.4457 +
1.4458 + if (childEnd <= end) {
1.4459 + selectedPosition = firstPosition + i;
1.4460 + selectedStart = childStart;
1.4461 + break;
1.4462 + }
1.4463 + }
1.4464 + }
1.4465 +
1.4466 + mResurrectToPosition = INVALID_POSITION;
1.4467 + mTouchMode = TOUCH_MODE_REST;
1.4468 + reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
1.4469 +
1.4470 + mSpecificStart = selectedStart;
1.4471 +
1.4472 + selectedPosition = lookForSelectablePosition(selectedPosition, down);
1.4473 + if (selectedPosition >= firstPosition && selectedPosition <= getLastVisiblePosition()) {
1.4474 + mLayoutMode = LAYOUT_SPECIFIC;
1.4475 + updateSelectorState();
1.4476 + setSelectionInt(selectedPosition);
1.4477 + invokeOnItemScrollListener();
1.4478 + } else {
1.4479 + selectedPosition = INVALID_POSITION;
1.4480 + }
1.4481 +
1.4482 + return selectedPosition >= 0;
1.4483 + }
1.4484 +
1.4485 + /**
1.4486 + * If there is a selection returns false.
1.4487 + * Otherwise resurrects the selection and returns true if resurrected.
1.4488 + */
1.4489 + boolean resurrectSelectionIfNeeded() {
1.4490 + if (mSelectedPosition < 0 && resurrectSelection()) {
1.4491 + updateSelectorState();
1.4492 + return true;
1.4493 + }
1.4494 +
1.4495 + return false;
1.4496 + }
1.4497 +
1.4498 + private int getChildWidthMeasureSpec(LayoutParams lp) {
1.4499 + if (!mIsVertical && lp.width == LayoutParams.WRAP_CONTENT) {
1.4500 + return MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
1.4501 + } else if (mIsVertical) {
1.4502 + final int maxWidth = getWidth() - getPaddingLeft() - getPaddingRight();
1.4503 + return MeasureSpec.makeMeasureSpec(maxWidth, MeasureSpec.EXACTLY);
1.4504 + } else {
1.4505 + return MeasureSpec.makeMeasureSpec(lp.width, MeasureSpec.EXACTLY);
1.4506 + }
1.4507 + }
1.4508 +
1.4509 + private int getChildHeightMeasureSpec(LayoutParams lp) {
1.4510 + if (mIsVertical && lp.height == LayoutParams.WRAP_CONTENT) {
1.4511 + return MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
1.4512 + } else if (!mIsVertical) {
1.4513 + final int maxHeight = getHeight() - getPaddingTop() - getPaddingBottom();
1.4514 + return MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.EXACTLY);
1.4515 + } else {
1.4516 + return MeasureSpec.makeMeasureSpec(lp.height, MeasureSpec.EXACTLY);
1.4517 + }
1.4518 + }
1.4519 +
1.4520 + private void measureChild(View child) {
1.4521 + measureChild(child, (LayoutParams) child.getLayoutParams());
1.4522 + }
1.4523 +
1.4524 + private void measureChild(View child, LayoutParams lp) {
1.4525 + final int widthSpec = getChildWidthMeasureSpec(lp);
1.4526 + final int heightSpec = getChildHeightMeasureSpec(lp);
1.4527 + child.measure(widthSpec, heightSpec);
1.4528 + }
1.4529 +
1.4530 + private void relayoutMeasuredChild(View child) {
1.4531 + final int w = child.getMeasuredWidth();
1.4532 + final int h = child.getMeasuredHeight();
1.4533 +
1.4534 + final int childLeft = getPaddingLeft();
1.4535 + final int childRight = childLeft + w;
1.4536 + final int childTop = child.getTop();
1.4537 + final int childBottom = childTop + h;
1.4538 +
1.4539 + child.layout(childLeft, childTop, childRight, childBottom);
1.4540 + }
1.4541 +
1.4542 + private void measureScrapChild(View scrapChild, int position, int secondaryMeasureSpec) {
1.4543 + LayoutParams lp = (LayoutParams) scrapChild.getLayoutParams();
1.4544 + if (lp == null) {
1.4545 + lp = generateDefaultLayoutParams();
1.4546 + scrapChild.setLayoutParams(lp);
1.4547 + }
1.4548 +
1.4549 + lp.viewType = mAdapter.getItemViewType(position);
1.4550 + lp.forceAdd = true;
1.4551 +
1.4552 + final int widthMeasureSpec;
1.4553 + final int heightMeasureSpec;
1.4554 + if (mIsVertical) {
1.4555 + widthMeasureSpec = secondaryMeasureSpec;
1.4556 + heightMeasureSpec = getChildHeightMeasureSpec(lp);
1.4557 + } else {
1.4558 + widthMeasureSpec = getChildWidthMeasureSpec(lp);
1.4559 + heightMeasureSpec = secondaryMeasureSpec;
1.4560 + }
1.4561 +
1.4562 + scrapChild.measure(widthMeasureSpec, heightMeasureSpec);
1.4563 + }
1.4564 +
1.4565 + /**
1.4566 + * Measures the height of the given range of children (inclusive) and
1.4567 + * returns the height with this TwoWayView's padding and item margin heights
1.4568 + * included. If maxHeight is provided, the measuring will stop when the
1.4569 + * current height reaches maxHeight.
1.4570 + *
1.4571 + * @param widthMeasureSpec The width measure spec to be given to a child's
1.4572 + * {@link View#measure(int, int)}.
1.4573 + * @param startPosition The position of the first child to be shown.
1.4574 + * @param endPosition The (inclusive) position of the last child to be
1.4575 + * shown. Specify {@link #NO_POSITION} if the last child should be
1.4576 + * the last available child from the adapter.
1.4577 + * @param maxHeight The maximum height that will be returned (if all the
1.4578 + * children don't fit in this value, this value will be
1.4579 + * returned).
1.4580 + * @param disallowPartialChildPosition In general, whether the returned
1.4581 + * height should only contain entire children. This is more
1.4582 + * powerful--it is the first inclusive position at which partial
1.4583 + * children will not be allowed. Example: it looks nice to have
1.4584 + * at least 3 completely visible children, and in portrait this
1.4585 + * will most likely fit; but in landscape there could be times
1.4586 + * when even 2 children can not be completely shown, so a value
1.4587 + * of 2 (remember, inclusive) would be good (assuming
1.4588 + * startPosition is 0).
1.4589 + * @return The height of this TwoWayView with the given children.
1.4590 + */
1.4591 + private int measureHeightOfChildren(int widthMeasureSpec, int startPosition, int endPosition,
1.4592 + final int maxHeight, int disallowPartialChildPosition) {
1.4593 +
1.4594 + final int paddingTop = getPaddingTop();
1.4595 + final int paddingBottom = getPaddingBottom();
1.4596 +
1.4597 + final ListAdapter adapter = mAdapter;
1.4598 + if (adapter == null) {
1.4599 + return paddingTop + paddingBottom;
1.4600 + }
1.4601 +
1.4602 + // Include the padding of the list
1.4603 + int returnedHeight = paddingTop + paddingBottom;
1.4604 + final int itemMargin = mItemMargin;
1.4605 +
1.4606 + // The previous height value that was less than maxHeight and contained
1.4607 + // no partial children
1.4608 + int prevHeightWithoutPartialChild = 0;
1.4609 + int i;
1.4610 + View child;
1.4611 +
1.4612 + // mItemCount - 1 since endPosition parameter is inclusive
1.4613 + endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition;
1.4614 + final RecycleBin recycleBin = mRecycler;
1.4615 + final boolean shouldRecycle = recycleOnMeasure();
1.4616 + final boolean[] isScrap = mIsScrap;
1.4617 +
1.4618 + for (i = startPosition; i <= endPosition; ++i) {
1.4619 + child = obtainView(i, isScrap);
1.4620 +
1.4621 + measureScrapChild(child, i, widthMeasureSpec);
1.4622 +
1.4623 + if (i > 0) {
1.4624 + // Count the item margin for all but one child
1.4625 + returnedHeight += itemMargin;
1.4626 + }
1.4627 +
1.4628 + // Recycle the view before we possibly return from the method
1.4629 + if (shouldRecycle) {
1.4630 + recycleBin.addScrapView(child, -1);
1.4631 + }
1.4632 +
1.4633 + returnedHeight += child.getMeasuredHeight();
1.4634 +
1.4635 + if (returnedHeight >= maxHeight) {
1.4636 + // We went over, figure out which height to return. If returnedHeight > maxHeight,
1.4637 + // then the i'th position did not fit completely.
1.4638 + return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
1.4639 + && (i > disallowPartialChildPosition) // We've past the min pos
1.4640 + && (prevHeightWithoutPartialChild > 0) // We have a prev height
1.4641 + && (returnedHeight != maxHeight) // i'th child did not fit completely
1.4642 + ? prevHeightWithoutPartialChild
1.4643 + : maxHeight;
1.4644 + }
1.4645 +
1.4646 + if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
1.4647 + prevHeightWithoutPartialChild = returnedHeight;
1.4648 + }
1.4649 + }
1.4650 +
1.4651 + // At this point, we went through the range of children, and they each
1.4652 + // completely fit, so return the returnedHeight
1.4653 + return returnedHeight;
1.4654 + }
1.4655 +
1.4656 + /**
1.4657 + * Measures the width of the given range of children (inclusive) and
1.4658 + * returns the width with this TwoWayView's padding and item margin widths
1.4659 + * included. If maxWidth is provided, the measuring will stop when the
1.4660 + * current width reaches maxWidth.
1.4661 + *
1.4662 + * @param heightMeasureSpec The height measure spec to be given to a child's
1.4663 + * {@link View#measure(int, int)}.
1.4664 + * @param startPosition The position of the first child to be shown.
1.4665 + * @param endPosition The (inclusive) position of the last child to be
1.4666 + * shown. Specify {@link #NO_POSITION} if the last child should be
1.4667 + * the last available child from the adapter.
1.4668 + * @param maxWidth The maximum width that will be returned (if all the
1.4669 + * children don't fit in this value, this value will be
1.4670 + * returned).
1.4671 + * @param disallowPartialChildPosition In general, whether the returned
1.4672 + * width should only contain entire children. This is more
1.4673 + * powerful--it is the first inclusive position at which partial
1.4674 + * children will not be allowed. Example: it looks nice to have
1.4675 + * at least 3 completely visible children, and in portrait this
1.4676 + * will most likely fit; but in landscape there could be times
1.4677 + * when even 2 children can not be completely shown, so a value
1.4678 + * of 2 (remember, inclusive) would be good (assuming
1.4679 + * startPosition is 0).
1.4680 + * @return The width of this TwoWayView with the given children.
1.4681 + */
1.4682 + private int measureWidthOfChildren(int heightMeasureSpec, int startPosition, int endPosition,
1.4683 + final int maxWidth, int disallowPartialChildPosition) {
1.4684 +
1.4685 + final int paddingLeft = getPaddingLeft();
1.4686 + final int paddingRight = getPaddingRight();
1.4687 +
1.4688 + final ListAdapter adapter = mAdapter;
1.4689 + if (adapter == null) {
1.4690 + return paddingLeft + paddingRight;
1.4691 + }
1.4692 +
1.4693 + // Include the padding of the list
1.4694 + int returnedWidth = paddingLeft + paddingRight;
1.4695 + final int itemMargin = mItemMargin;
1.4696 +
1.4697 + // The previous height value that was less than maxHeight and contained
1.4698 + // no partial children
1.4699 + int prevWidthWithoutPartialChild = 0;
1.4700 + int i;
1.4701 + View child;
1.4702 +
1.4703 + // mItemCount - 1 since endPosition parameter is inclusive
1.4704 + endPosition = (endPosition == NO_POSITION) ? adapter.getCount() - 1 : endPosition;
1.4705 + final RecycleBin recycleBin = mRecycler;
1.4706 + final boolean shouldRecycle = recycleOnMeasure();
1.4707 + final boolean[] isScrap = mIsScrap;
1.4708 +
1.4709 + for (i = startPosition; i <= endPosition; ++i) {
1.4710 + child = obtainView(i, isScrap);
1.4711 +
1.4712 + measureScrapChild(child, i, heightMeasureSpec);
1.4713 +
1.4714 + if (i > 0) {
1.4715 + // Count the item margin for all but one child
1.4716 + returnedWidth += itemMargin;
1.4717 + }
1.4718 +
1.4719 + // Recycle the view before we possibly return from the method
1.4720 + if (shouldRecycle) {
1.4721 + recycleBin.addScrapView(child, -1);
1.4722 + }
1.4723 +
1.4724 + returnedWidth += child.getMeasuredHeight();
1.4725 +
1.4726 + if (returnedWidth >= maxWidth) {
1.4727 + // We went over, figure out which width to return. If returnedWidth > maxWidth,
1.4728 + // then the i'th position did not fit completely.
1.4729 + return (disallowPartialChildPosition >= 0) // Disallowing is enabled (> -1)
1.4730 + && (i > disallowPartialChildPosition) // We've past the min pos
1.4731 + && (prevWidthWithoutPartialChild > 0) // We have a prev width
1.4732 + && (returnedWidth != maxWidth) // i'th child did not fit completely
1.4733 + ? prevWidthWithoutPartialChild
1.4734 + : maxWidth;
1.4735 + }
1.4736 +
1.4737 + if ((disallowPartialChildPosition >= 0) && (i >= disallowPartialChildPosition)) {
1.4738 + prevWidthWithoutPartialChild = returnedWidth;
1.4739 + }
1.4740 + }
1.4741 +
1.4742 + // At this point, we went through the range of children, and they each
1.4743 + // completely fit, so return the returnedWidth
1.4744 + return returnedWidth;
1.4745 + }
1.4746 +
1.4747 + private View makeAndAddView(int position, int offset, boolean flow, boolean selected) {
1.4748 + final int top;
1.4749 + final int left;
1.4750 +
1.4751 + if (mIsVertical) {
1.4752 + top = offset;
1.4753 + left = getPaddingLeft();
1.4754 + } else {
1.4755 + top = getPaddingTop();
1.4756 + left = offset;
1.4757 + }
1.4758 +
1.4759 + if (!mDataChanged) {
1.4760 + // Try to use an existing view for this position
1.4761 + final View activeChild = mRecycler.getActiveView(position);
1.4762 + if (activeChild != null) {
1.4763 + // Found it -- we're using an existing child
1.4764 + // This just needs to be positioned
1.4765 + setupChild(activeChild, position, top, left, flow, selected, true);
1.4766 +
1.4767 + return activeChild;
1.4768 + }
1.4769 + }
1.4770 +
1.4771 + // Make a new view for this position, or convert an unused view if possible
1.4772 + final View child = obtainView(position, mIsScrap);
1.4773 +
1.4774 + // This needs to be positioned and measured
1.4775 + setupChild(child, position, top, left, flow, selected, mIsScrap[0]);
1.4776 +
1.4777 + return child;
1.4778 + }
1.4779 +
1.4780 + @TargetApi(11)
1.4781 + private void setupChild(View child, int position, int top, int left,
1.4782 + boolean flow, boolean selected, boolean recycled) {
1.4783 + final boolean isSelected = selected && shouldShowSelector();
1.4784 + final boolean updateChildSelected = isSelected != child.isSelected();
1.4785 + final int touchMode = mTouchMode;
1.4786 +
1.4787 + final boolean isPressed = touchMode > TOUCH_MODE_DOWN && touchMode < TOUCH_MODE_DRAGGING &&
1.4788 + mMotionPosition == position;
1.4789 +
1.4790 + final boolean updateChildPressed = isPressed != child.isPressed();
1.4791 + final boolean needToMeasure = !recycled || updateChildSelected || child.isLayoutRequested();
1.4792 +
1.4793 + // Respect layout params that are already in the view. Otherwise make some up...
1.4794 + LayoutParams lp = (LayoutParams) child.getLayoutParams();
1.4795 + if (lp == null) {
1.4796 + lp = generateDefaultLayoutParams();
1.4797 + }
1.4798 +
1.4799 + lp.viewType = mAdapter.getItemViewType(position);
1.4800 +
1.4801 + if (recycled && !lp.forceAdd) {
1.4802 + attachViewToParent(child, (flow ? -1 : 0), lp);
1.4803 + } else {
1.4804 + lp.forceAdd = false;
1.4805 + addViewInLayout(child, (flow ? -1 : 0), lp, true);
1.4806 + }
1.4807 +
1.4808 + if (updateChildSelected) {
1.4809 + child.setSelected(isSelected);
1.4810 + }
1.4811 +
1.4812 + if (updateChildPressed) {
1.4813 + child.setPressed(isPressed);
1.4814 + }
1.4815 +
1.4816 + if (mChoiceMode.compareTo(ChoiceMode.NONE) != 0 && mCheckStates != null) {
1.4817 + if (child instanceof Checkable) {
1.4818 + ((Checkable) child).setChecked(mCheckStates.get(position));
1.4819 + } else if (getContext().getApplicationInfo().targetSdkVersion
1.4820 + >= Build.VERSION_CODES.HONEYCOMB) {
1.4821 + child.setActivated(mCheckStates.get(position));
1.4822 + }
1.4823 + }
1.4824 +
1.4825 + if (needToMeasure) {
1.4826 + measureChild(child, lp);
1.4827 + } else {
1.4828 + cleanupLayoutState(child);
1.4829 + }
1.4830 +
1.4831 + final int w = child.getMeasuredWidth();
1.4832 + final int h = child.getMeasuredHeight();
1.4833 +
1.4834 + final int childTop = (mIsVertical && !flow ? top - h : top);
1.4835 + final int childLeft = (!mIsVertical && !flow ? left - w : left);
1.4836 +
1.4837 + if (needToMeasure) {
1.4838 + final int childRight = childLeft + w;
1.4839 + final int childBottom = childTop + h;
1.4840 +
1.4841 + child.layout(childLeft, childTop, childRight, childBottom);
1.4842 + } else {
1.4843 + child.offsetLeftAndRight(childLeft - child.getLeft());
1.4844 + child.offsetTopAndBottom(childTop - child.getTop());
1.4845 + }
1.4846 + }
1.4847 +
1.4848 + void fillGap(boolean down) {
1.4849 + final int childCount = getChildCount();
1.4850 +
1.4851 + if (down) {
1.4852 + final int paddingStart = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.4853 +
1.4854 + final int lastEnd;
1.4855 + if (mIsVertical) {
1.4856 + lastEnd = getChildAt(childCount - 1).getBottom();
1.4857 + } else {
1.4858 + lastEnd = getChildAt(childCount - 1).getRight();
1.4859 + }
1.4860 +
1.4861 + final int offset = (childCount > 0 ? lastEnd + mItemMargin : paddingStart);
1.4862 + fillAfter(mFirstPosition + childCount, offset);
1.4863 + correctTooHigh(getChildCount());
1.4864 + } else {
1.4865 + final int end;
1.4866 + final int firstStart;
1.4867 +
1.4868 + if (mIsVertical) {
1.4869 + end = getHeight() - getPaddingBottom();
1.4870 + firstStart = getChildAt(0).getTop();
1.4871 + } else {
1.4872 + end = getWidth() - getPaddingRight();
1.4873 + firstStart = getChildAt(0).getLeft();
1.4874 + }
1.4875 +
1.4876 + final int offset = (childCount > 0 ? firstStart - mItemMargin : end);
1.4877 + fillBefore(mFirstPosition - 1, offset);
1.4878 + correctTooLow(getChildCount());
1.4879 + }
1.4880 + }
1.4881 +
1.4882 + private View fillBefore(int pos, int nextOffset) {
1.4883 + View selectedView = null;
1.4884 +
1.4885 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.4886 +
1.4887 + while (nextOffset > start && pos >= 0) {
1.4888 + boolean isSelected = (pos == mSelectedPosition);
1.4889 + View child = makeAndAddView(pos, nextOffset, false, isSelected);
1.4890 +
1.4891 + if (mIsVertical) {
1.4892 + nextOffset = child.getTop() - mItemMargin;
1.4893 + } else {
1.4894 + nextOffset = child.getLeft() - mItemMargin;
1.4895 + }
1.4896 +
1.4897 + if (isSelected) {
1.4898 + selectedView = child;
1.4899 + }
1.4900 +
1.4901 + pos--;
1.4902 + }
1.4903 +
1.4904 + mFirstPosition = pos + 1;
1.4905 +
1.4906 + return selectedView;
1.4907 + }
1.4908 +
1.4909 + private View fillAfter(int pos, int nextOffset) {
1.4910 + View selectedView = null;
1.4911 +
1.4912 + final int end =
1.4913 + (mIsVertical ? getHeight() - getPaddingBottom() : getWidth() - getPaddingRight());
1.4914 +
1.4915 + while (nextOffset < end && pos < mItemCount) {
1.4916 + boolean selected = (pos == mSelectedPosition);
1.4917 +
1.4918 + View child = makeAndAddView(pos, nextOffset, true, selected);
1.4919 +
1.4920 + if (mIsVertical) {
1.4921 + nextOffset = child.getBottom() + mItemMargin;
1.4922 + } else {
1.4923 + nextOffset = child.getRight() + mItemMargin;
1.4924 + }
1.4925 +
1.4926 + if (selected) {
1.4927 + selectedView = child;
1.4928 + }
1.4929 +
1.4930 + pos++;
1.4931 + }
1.4932 +
1.4933 + return selectedView;
1.4934 + }
1.4935 +
1.4936 + private View fillSpecific(int position, int offset) {
1.4937 + final boolean tempIsSelected = (position == mSelectedPosition);
1.4938 + View temp = makeAndAddView(position, offset, true, tempIsSelected);
1.4939 +
1.4940 + // Possibly changed again in fillBefore if we add rows above this one.
1.4941 + mFirstPosition = position;
1.4942 +
1.4943 + final int itemMargin = mItemMargin;
1.4944 +
1.4945 + final int offsetBefore;
1.4946 + if (mIsVertical) {
1.4947 + offsetBefore = temp.getTop() - itemMargin;
1.4948 + } else {
1.4949 + offsetBefore = temp.getLeft() - itemMargin;
1.4950 + }
1.4951 + final View before = fillBefore(position - 1, offsetBefore);
1.4952 +
1.4953 + // This will correct for the top of the first view not touching the top of the list
1.4954 + adjustViewsStartOrEnd();
1.4955 +
1.4956 + final int offsetAfter;
1.4957 + if (mIsVertical) {
1.4958 + offsetAfter = temp.getBottom() + itemMargin;
1.4959 + } else {
1.4960 + offsetAfter = temp.getRight() + itemMargin;
1.4961 + }
1.4962 + final View after = fillAfter(position + 1, offsetAfter);
1.4963 +
1.4964 + final int childCount = getChildCount();
1.4965 + if (childCount > 0) {
1.4966 + correctTooHigh(childCount);
1.4967 + }
1.4968 +
1.4969 + if (tempIsSelected) {
1.4970 + return temp;
1.4971 + } else if (before != null) {
1.4972 + return before;
1.4973 + } else {
1.4974 + return after;
1.4975 + }
1.4976 + }
1.4977 +
1.4978 + private View fillFromOffset(int nextOffset) {
1.4979 + mFirstPosition = Math.min(mFirstPosition, mSelectedPosition);
1.4980 + mFirstPosition = Math.min(mFirstPosition, mItemCount - 1);
1.4981 +
1.4982 + if (mFirstPosition < 0) {
1.4983 + mFirstPosition = 0;
1.4984 + }
1.4985 +
1.4986 + return fillAfter(mFirstPosition, nextOffset);
1.4987 + }
1.4988 +
1.4989 + private View fillFromMiddle(int start, int end) {
1.4990 + final int size = end - start;
1.4991 + int position = reconcileSelectedPosition();
1.4992 +
1.4993 + View selected = makeAndAddView(position, start, true, true);
1.4994 + mFirstPosition = position;
1.4995 +
1.4996 + if (mIsVertical) {
1.4997 + int selectedHeight = selected.getMeasuredHeight();
1.4998 + if (selectedHeight <= size) {
1.4999 + selected.offsetTopAndBottom((size - selectedHeight) / 2);
1.5000 + }
1.5001 + } else {
1.5002 + int selectedWidth = selected.getMeasuredWidth();
1.5003 + if (selectedWidth <= size) {
1.5004 + selected.offsetLeftAndRight((size - selectedWidth) / 2);
1.5005 + }
1.5006 + }
1.5007 +
1.5008 + fillBeforeAndAfter(selected, position);
1.5009 + correctTooHigh(getChildCount());
1.5010 +
1.5011 + return selected;
1.5012 + }
1.5013 +
1.5014 + private void fillBeforeAndAfter(View selected, int position) {
1.5015 + final int itemMargin = mItemMargin;
1.5016 +
1.5017 + final int offsetBefore;
1.5018 + if (mIsVertical) {
1.5019 + offsetBefore = selected.getTop() - itemMargin;
1.5020 + } else {
1.5021 + offsetBefore = selected.getLeft() - itemMargin;
1.5022 + }
1.5023 +
1.5024 + fillBefore(position - 1, offsetBefore);
1.5025 +
1.5026 + adjustViewsStartOrEnd();
1.5027 +
1.5028 + final int offsetAfter;
1.5029 + if (mIsVertical) {
1.5030 + offsetAfter = selected.getBottom() + itemMargin;
1.5031 + } else {
1.5032 + offsetAfter = selected.getRight() + itemMargin;
1.5033 + }
1.5034 +
1.5035 + fillAfter(position + 1, offsetAfter);
1.5036 + }
1.5037 +
1.5038 + private View fillFromSelection(int selectedTop, int start, int end) {
1.5039 + final int selectedPosition = mSelectedPosition;
1.5040 + View selected;
1.5041 +
1.5042 + selected = makeAndAddView(selectedPosition, selectedTop, true, true);
1.5043 +
1.5044 + final int selectedStart = (mIsVertical ? selected.getTop() : selected.getLeft());
1.5045 + final int selectedEnd = (mIsVertical ? selected.getBottom() : selected.getRight());
1.5046 +
1.5047 + // Some of the newly selected item extends below the bottom of the list
1.5048 + if (selectedEnd > end) {
1.5049 + // Find space available above the selection into which we can scroll
1.5050 + // upwards
1.5051 + final int spaceAbove = selectedStart - start;
1.5052 +
1.5053 + // Find space required to bring the bottom of the selected item
1.5054 + // fully into view
1.5055 + final int spaceBelow = selectedEnd - end;
1.5056 +
1.5057 + final int offset = Math.min(spaceAbove, spaceBelow);
1.5058 +
1.5059 + // Now offset the selected item to get it into view
1.5060 + selected.offsetTopAndBottom(-offset);
1.5061 + } else if (selectedStart < start) {
1.5062 + // Find space required to bring the top of the selected item fully
1.5063 + // into view
1.5064 + final int spaceAbove = start - selectedStart;
1.5065 +
1.5066 + // Find space available below the selection into which we can scroll
1.5067 + // downwards
1.5068 + final int spaceBelow = end - selectedEnd;
1.5069 +
1.5070 + final int offset = Math.min(spaceAbove, spaceBelow);
1.5071 +
1.5072 + // Offset the selected item to get it into view
1.5073 + selected.offsetTopAndBottom(offset);
1.5074 + }
1.5075 +
1.5076 + // Fill in views above and below
1.5077 + fillBeforeAndAfter(selected, selectedPosition);
1.5078 + correctTooHigh(getChildCount());
1.5079 +
1.5080 + return selected;
1.5081 + }
1.5082 +
1.5083 + private void correctTooHigh(int childCount) {
1.5084 + // First see if the last item is visible. If it is not, it is OK for the
1.5085 + // top of the list to be pushed up.
1.5086 + final int lastPosition = mFirstPosition + childCount - 1;
1.5087 + if (lastPosition != mItemCount - 1 || childCount == 0) {
1.5088 + return;
1.5089 + }
1.5090 +
1.5091 + // Get the last child ...
1.5092 + final View lastChild = getChildAt(childCount - 1);
1.5093 +
1.5094 + // ... and its end edge
1.5095 + final int lastEnd;
1.5096 + if (mIsVertical) {
1.5097 + lastEnd = lastChild.getBottom();
1.5098 + } else {
1.5099 + lastEnd = lastChild.getRight();
1.5100 + }
1.5101 +
1.5102 + // This is bottom of our drawable area
1.5103 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.5104 + final int end =
1.5105 + (mIsVertical ? getHeight() - getPaddingBottom() : getWidth() - getPaddingRight());
1.5106 +
1.5107 + // This is how far the end edge of the last view is from the end of the
1.5108 + // drawable area
1.5109 + int endOffset = end - lastEnd;
1.5110 +
1.5111 + View firstChild = getChildAt(0);
1.5112 + int firstStart = (mIsVertical ? firstChild.getTop() : firstChild.getLeft());
1.5113 +
1.5114 + // Make sure we are 1) Too high, and 2) Either there are more rows above the
1.5115 + // first row or the first row is scrolled off the top of the drawable area
1.5116 + if (endOffset > 0 && (mFirstPosition > 0 || firstStart < start)) {
1.5117 + if (mFirstPosition == 0) {
1.5118 + // Don't pull the top too far down
1.5119 + endOffset = Math.min(endOffset, start - firstStart);
1.5120 + }
1.5121 +
1.5122 + // Move everything down
1.5123 + offsetChildren(endOffset);
1.5124 +
1.5125 + if (mFirstPosition > 0) {
1.5126 + firstStart = (mIsVertical ? firstChild.getTop() : firstChild.getLeft());
1.5127 +
1.5128 + // Fill the gap that was opened above mFirstPosition with more rows, if
1.5129 + // possible
1.5130 + fillBefore(mFirstPosition - 1, firstStart - mItemMargin);
1.5131 +
1.5132 + // Close up the remaining gap
1.5133 + adjustViewsStartOrEnd();
1.5134 + }
1.5135 + }
1.5136 + }
1.5137 +
1.5138 + private void correctTooLow(int childCount) {
1.5139 + // First see if the first item is visible. If it is not, it is OK for the
1.5140 + // bottom of the list to be pushed down.
1.5141 + if (mFirstPosition != 0 || childCount == 0) {
1.5142 + return;
1.5143 + }
1.5144 +
1.5145 + final View first = getChildAt(0);
1.5146 + final int firstStart = (mIsVertical ? first.getTop() : first.getLeft());
1.5147 +
1.5148 + final int start = (mIsVertical ? getPaddingTop() : getPaddingLeft());
1.5149 +
1.5150 + final int end;
1.5151 + if (mIsVertical) {
1.5152 + end = getHeight() - getPaddingBottom();
1.5153 + } else {
1.5154 + end = getWidth() - getPaddingRight();
1.5155 + }
1.5156 +
1.5157 + // This is how far the start edge of the first view is from the start of the
1.5158 + // drawable area
1.5159 + int startOffset = firstStart - start;
1.5160 +
1.5161 + View last = getChildAt(childCount - 1);
1.5162 + int lastEnd = (mIsVertical ? last.getBottom() : last.getRight());
1.5163 +
1.5164 + int lastPosition = mFirstPosition + childCount - 1;
1.5165 +
1.5166 + // Make sure we are 1) Too low, and 2) Either there are more columns/rows below the
1.5167 + // last column/row or the last column/row is scrolled off the end of the
1.5168 + // drawable area
1.5169 + if (startOffset > 0) {
1.5170 + if (lastPosition < mItemCount - 1 || lastEnd > end) {
1.5171 + if (lastPosition == mItemCount - 1) {
1.5172 + // Don't pull the bottom too far up
1.5173 + startOffset = Math.min(startOffset, lastEnd - end);
1.5174 + }
1.5175 +
1.5176 + // Move everything up
1.5177 + offsetChildren(-startOffset);
1.5178 +
1.5179 + if (lastPosition < mItemCount - 1) {
1.5180 + lastEnd = (mIsVertical ? last.getBottom() : last.getRight());
1.5181 +
1.5182 + // Fill the gap that was opened below the last position with more rows, if
1.5183 + // possible
1.5184 + fillAfter(lastPosition + 1, lastEnd + mItemMargin);
1.5185 +
1.5186 + // Close up the remaining gap
1.5187 + adjustViewsStartOrEnd();
1.5188 + }
1.5189 + } else if (lastPosition == mItemCount - 1) {
1.5190 + adjustViewsStartOrEnd();
1.5191 + }
1.5192 + }
1.5193 + }
1.5194 +
1.5195 + private void adjustViewsStartOrEnd() {
1.5196 + if (getChildCount() == 0) {
1.5197 + return;
1.5198 + }
1.5199 +
1.5200 + final View firstChild = getChildAt(0);
1.5201 +
1.5202 + int delta;
1.5203 + if (mIsVertical) {
1.5204 + delta = firstChild.getTop() - getPaddingTop() - mItemMargin;
1.5205 + } else {
1.5206 + delta = firstChild.getLeft() - getPaddingLeft() - mItemMargin;
1.5207 + }
1.5208 +
1.5209 + if (delta < 0) {
1.5210 + // We only are looking to see if we are too low, not too high
1.5211 + delta = 0;
1.5212 + }
1.5213 +
1.5214 + if (delta != 0) {
1.5215 + offsetChildren(-delta);
1.5216 + }
1.5217 + }
1.5218 +
1.5219 + @TargetApi(14)
1.5220 + private SparseBooleanArray cloneCheckStates() {
1.5221 + if (mCheckStates == null) {
1.5222 + return null;
1.5223 + }
1.5224 +
1.5225 + SparseBooleanArray checkedStates;
1.5226 +
1.5227 + if (Build.VERSION.SDK_INT >= 14) {
1.5228 + checkedStates = mCheckStates.clone();
1.5229 + } else {
1.5230 + checkedStates = new SparseBooleanArray();
1.5231 +
1.5232 + for (int i = 0; i < mCheckStates.size(); i++) {
1.5233 + checkedStates.put(mCheckStates.keyAt(i), mCheckStates.valueAt(i));
1.5234 + }
1.5235 + }
1.5236 +
1.5237 + return checkedStates;
1.5238 + }
1.5239 +
1.5240 + private int findSyncPosition() {
1.5241 + int itemCount = mItemCount;
1.5242 +
1.5243 + if (itemCount == 0) {
1.5244 + return INVALID_POSITION;
1.5245 + }
1.5246 +
1.5247 + final long idToMatch = mSyncRowId;
1.5248 +
1.5249 + // If there isn't a selection don't hunt for it
1.5250 + if (idToMatch == INVALID_ROW_ID) {
1.5251 + return INVALID_POSITION;
1.5252 + }
1.5253 +
1.5254 + // Pin seed to reasonable values
1.5255 + int seed = mSyncPosition;
1.5256 + seed = Math.max(0, seed);
1.5257 + seed = Math.min(itemCount - 1, seed);
1.5258 +
1.5259 + long endTime = SystemClock.uptimeMillis() + SYNC_MAX_DURATION_MILLIS;
1.5260 +
1.5261 + long rowId;
1.5262 +
1.5263 + // first position scanned so far
1.5264 + int first = seed;
1.5265 +
1.5266 + // last position scanned so far
1.5267 + int last = seed;
1.5268 +
1.5269 + // True if we should move down on the next iteration
1.5270 + boolean next = false;
1.5271 +
1.5272 + // True when we have looked at the first item in the data
1.5273 + boolean hitFirst;
1.5274 +
1.5275 + // True when we have looked at the last item in the data
1.5276 + boolean hitLast;
1.5277 +
1.5278 + // Get the item ID locally (instead of getItemIdAtPosition), so
1.5279 + // we need the adapter
1.5280 + final ListAdapter adapter = mAdapter;
1.5281 + if (adapter == null) {
1.5282 + return INVALID_POSITION;
1.5283 + }
1.5284 +
1.5285 + while (SystemClock.uptimeMillis() <= endTime) {
1.5286 + rowId = adapter.getItemId(seed);
1.5287 + if (rowId == idToMatch) {
1.5288 + // Found it!
1.5289 + return seed;
1.5290 + }
1.5291 +
1.5292 + hitLast = (last == itemCount - 1);
1.5293 + hitFirst = (first == 0);
1.5294 +
1.5295 + if (hitLast && hitFirst) {
1.5296 + // Looked at everything
1.5297 + break;
1.5298 + }
1.5299 +
1.5300 + if (hitFirst || (next && !hitLast)) {
1.5301 + // Either we hit the top, or we are trying to move down
1.5302 + last++;
1.5303 + seed = last;
1.5304 +
1.5305 + // Try going up next time
1.5306 + next = false;
1.5307 + } else if (hitLast || (!next && !hitFirst)) {
1.5308 + // Either we hit the bottom, or we are trying to move up
1.5309 + first--;
1.5310 + seed = first;
1.5311 +
1.5312 + // Try going down next time
1.5313 + next = true;
1.5314 + }
1.5315 + }
1.5316 +
1.5317 + return INVALID_POSITION;
1.5318 + }
1.5319 +
1.5320 + @TargetApi(16)
1.5321 + private View obtainView(int position, boolean[] isScrap) {
1.5322 + isScrap[0] = false;
1.5323 +
1.5324 + View scrapView = mRecycler.getTransientStateView(position);
1.5325 + if (scrapView != null) {
1.5326 + return scrapView;
1.5327 + }
1.5328 +
1.5329 + scrapView = mRecycler.getScrapView(position);
1.5330 +
1.5331 + final View child;
1.5332 + if (scrapView != null) {
1.5333 + child = mAdapter.getView(position, scrapView, this);
1.5334 +
1.5335 + if (child != scrapView) {
1.5336 + mRecycler.addScrapView(scrapView, position);
1.5337 + } else {
1.5338 + isScrap[0] = true;
1.5339 + }
1.5340 + } else {
1.5341 + child = mAdapter.getView(position, null, this);
1.5342 + }
1.5343 +
1.5344 + if (ViewCompat.getImportantForAccessibility(child) == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
1.5345 + ViewCompat.setImportantForAccessibility(child, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);
1.5346 + }
1.5347 +
1.5348 + if (mHasStableIds) {
1.5349 + LayoutParams lp = (LayoutParams) child.getLayoutParams();
1.5350 +
1.5351 + if (lp == null) {
1.5352 + lp = generateDefaultLayoutParams();
1.5353 + } else if (!checkLayoutParams(lp)) {
1.5354 + lp = generateLayoutParams(lp);
1.5355 + }
1.5356 +
1.5357 + lp.id = mAdapter.getItemId(position);
1.5358 +
1.5359 + child.setLayoutParams(lp);
1.5360 + }
1.5361 +
1.5362 + if (mAccessibilityDelegate == null) {
1.5363 + mAccessibilityDelegate = new ListItemAccessibilityDelegate();
1.5364 + }
1.5365 +
1.5366 + ViewCompat.setAccessibilityDelegate(child, mAccessibilityDelegate);
1.5367 +
1.5368 + return child;
1.5369 + }
1.5370 +
1.5371 + void resetState() {
1.5372 + removeAllViewsInLayout();
1.5373 +
1.5374 + mSelectedStart = 0;
1.5375 + mFirstPosition = 0;
1.5376 + mDataChanged = false;
1.5377 + mNeedSync = false;
1.5378 + mPendingSync = null;
1.5379 + mOldSelectedPosition = INVALID_POSITION;
1.5380 + mOldSelectedRowId = INVALID_ROW_ID;
1.5381 +
1.5382 + mOverScroll = 0;
1.5383 +
1.5384 + setSelectedPositionInt(INVALID_POSITION);
1.5385 + setNextSelectedPositionInt(INVALID_POSITION);
1.5386 +
1.5387 + mSelectorPosition = INVALID_POSITION;
1.5388 + mSelectorRect.setEmpty();
1.5389 +
1.5390 + invalidate();
1.5391 + }
1.5392 +
1.5393 + private void rememberSyncState() {
1.5394 + if (getChildCount() == 0) {
1.5395 + return;
1.5396 + }
1.5397 +
1.5398 + mNeedSync = true;
1.5399 +
1.5400 + if (mSelectedPosition >= 0) {
1.5401 + View child = getChildAt(mSelectedPosition - mFirstPosition);
1.5402 +
1.5403 + mSyncRowId = mNextSelectedRowId;
1.5404 + mSyncPosition = mNextSelectedPosition;
1.5405 +
1.5406 + if (child != null) {
1.5407 + mSpecificStart = (mIsVertical ? child.getTop() : child.getLeft());
1.5408 + }
1.5409 +
1.5410 + mSyncMode = SYNC_SELECTED_POSITION;
1.5411 + } else {
1.5412 + // Sync the based on the offset of the first view
1.5413 + View child = getChildAt(0);
1.5414 + ListAdapter adapter = getAdapter();
1.5415 +
1.5416 + if (mFirstPosition >= 0 && mFirstPosition < adapter.getCount()) {
1.5417 + mSyncRowId = adapter.getItemId(mFirstPosition);
1.5418 + } else {
1.5419 + mSyncRowId = NO_ID;
1.5420 + }
1.5421 +
1.5422 + mSyncPosition = mFirstPosition;
1.5423 +
1.5424 + if (child != null) {
1.5425 + mSpecificStart = child.getTop();
1.5426 + }
1.5427 +
1.5428 + mSyncMode = SYNC_FIRST_POSITION;
1.5429 + }
1.5430 + }
1.5431 +
1.5432 + private ContextMenuInfo createContextMenuInfo(View view, int position, long id) {
1.5433 + return new AdapterContextMenuInfo(view, position, id);
1.5434 + }
1.5435 +
1.5436 + @TargetApi(11)
1.5437 + private void updateOnScreenCheckedViews() {
1.5438 + final int firstPos = mFirstPosition;
1.5439 + final int count = getChildCount();
1.5440 +
1.5441 + final boolean useActivated = getContext().getApplicationInfo().targetSdkVersion
1.5442 + >= Build.VERSION_CODES.HONEYCOMB;
1.5443 +
1.5444 + for (int i = 0; i < count; i++) {
1.5445 + final View child = getChildAt(i);
1.5446 + final int position = firstPos + i;
1.5447 +
1.5448 + if (child instanceof Checkable) {
1.5449 + ((Checkable) child).setChecked(mCheckStates.get(position));
1.5450 + } else if (useActivated) {
1.5451 + child.setActivated(mCheckStates.get(position));
1.5452 + }
1.5453 + }
1.5454 + }
1.5455 +
1.5456 + @Override
1.5457 + public boolean performItemClick(View view, int position, long id) {
1.5458 + boolean checkedStateChanged = false;
1.5459 +
1.5460 + if (mChoiceMode.compareTo(ChoiceMode.MULTIPLE) == 0) {
1.5461 + boolean checked = !mCheckStates.get(position, false);
1.5462 + mCheckStates.put(position, checked);
1.5463 +
1.5464 + if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
1.5465 + if (checked) {
1.5466 + mCheckedIdStates.put(mAdapter.getItemId(position), position);
1.5467 + } else {
1.5468 + mCheckedIdStates.delete(mAdapter.getItemId(position));
1.5469 + }
1.5470 + }
1.5471 +
1.5472 + if (checked) {
1.5473 + mCheckedItemCount++;
1.5474 + } else {
1.5475 + mCheckedItemCount--;
1.5476 + }
1.5477 +
1.5478 + checkedStateChanged = true;
1.5479 + } else if (mChoiceMode.compareTo(ChoiceMode.SINGLE) == 0) {
1.5480 + boolean checked = !mCheckStates.get(position, false);
1.5481 + if (checked) {
1.5482 + mCheckStates.clear();
1.5483 + mCheckStates.put(position, true);
1.5484 +
1.5485 + if (mCheckedIdStates != null && mAdapter.hasStableIds()) {
1.5486 + mCheckedIdStates.clear();
1.5487 + mCheckedIdStates.put(mAdapter.getItemId(position), position);
1.5488 + }
1.5489 +
1.5490 + mCheckedItemCount = 1;
1.5491 + } else if (mCheckStates.size() == 0 || !mCheckStates.valueAt(0)) {
1.5492 + mCheckedItemCount = 0;
1.5493 + }
1.5494 +
1.5495 + checkedStateChanged = true;
1.5496 + }
1.5497 +
1.5498 + if (checkedStateChanged) {
1.5499 + updateOnScreenCheckedViews();
1.5500 + }
1.5501 +
1.5502 + return super.performItemClick(view, position, id);
1.5503 + }
1.5504 +
1.5505 + private boolean performLongPress(final View child,
1.5506 + final int longPressPosition, final long longPressId) {
1.5507 + // CHOICE_MODE_MULTIPLE_MODAL takes over long press.
1.5508 + boolean handled = false;
1.5509 +
1.5510 + OnItemLongClickListener listener = getOnItemLongClickListener();
1.5511 + if (listener != null) {
1.5512 + handled = listener.onItemLongClick(TwoWayView.this, child,
1.5513 + longPressPosition, longPressId);
1.5514 + }
1.5515 +
1.5516 + if (!handled) {
1.5517 + mContextMenuInfo = createContextMenuInfo(child, longPressPosition, longPressId);
1.5518 + handled = super.showContextMenuForChild(TwoWayView.this);
1.5519 + }
1.5520 +
1.5521 + if (handled) {
1.5522 + performHapticFeedback(HapticFeedbackConstants.LONG_PRESS);
1.5523 + }
1.5524 +
1.5525 + return handled;
1.5526 + }
1.5527 +
1.5528 + @Override
1.5529 + protected LayoutParams generateDefaultLayoutParams() {
1.5530 + if (mIsVertical) {
1.5531 + return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
1.5532 + } else {
1.5533 + return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);
1.5534 + }
1.5535 + }
1.5536 +
1.5537 + @Override
1.5538 + protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
1.5539 + return new LayoutParams(lp);
1.5540 + }
1.5541 +
1.5542 + @Override
1.5543 + protected boolean checkLayoutParams(ViewGroup.LayoutParams lp) {
1.5544 + return lp instanceof LayoutParams;
1.5545 + }
1.5546 +
1.5547 + @Override
1.5548 + public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) {
1.5549 + return new LayoutParams(getContext(), attrs);
1.5550 + }
1.5551 +
1.5552 + @Override
1.5553 + protected ContextMenuInfo getContextMenuInfo() {
1.5554 + return mContextMenuInfo;
1.5555 + }
1.5556 +
1.5557 + @Override
1.5558 + public Parcelable onSaveInstanceState() {
1.5559 + Parcelable superState = super.onSaveInstanceState();
1.5560 + SavedState ss = new SavedState(superState);
1.5561 +
1.5562 + if (mPendingSync != null) {
1.5563 + ss.selectedId = mPendingSync.selectedId;
1.5564 + ss.firstId = mPendingSync.firstId;
1.5565 + ss.viewStart = mPendingSync.viewStart;
1.5566 + ss.position = mPendingSync.position;
1.5567 + ss.height = mPendingSync.height;
1.5568 +
1.5569 + return ss;
1.5570 + }
1.5571 +
1.5572 + boolean haveChildren = (getChildCount() > 0 && mItemCount > 0);
1.5573 + long selectedId = getSelectedItemId();
1.5574 + ss.selectedId = selectedId;
1.5575 + ss.height = getHeight();
1.5576 +
1.5577 + if (selectedId >= 0) {
1.5578 + ss.viewStart = mSelectedStart;
1.5579 + ss.position = getSelectedItemPosition();
1.5580 + ss.firstId = INVALID_POSITION;
1.5581 + } else if (haveChildren && mFirstPosition > 0) {
1.5582 + // Remember the position of the first child.
1.5583 + // We only do this if we are not currently at the top of
1.5584 + // the list, for two reasons:
1.5585 + //
1.5586 + // (1) The list may be in the process of becoming empty, in
1.5587 + // which case mItemCount may not be 0, but if we try to
1.5588 + // ask for any information about position 0 we will crash.
1.5589 + //
1.5590 + // (2) Being "at the top" seems like a special case, anyway,
1.5591 + // and the user wouldn't expect to end up somewhere else when
1.5592 + // they revisit the list even if its content has changed.
1.5593 +
1.5594 + View child = getChildAt(0);
1.5595 + ss.viewStart = (mIsVertical ? child.getTop() : child.getLeft());
1.5596 +
1.5597 + int firstPos = mFirstPosition;
1.5598 + if (firstPos >= mItemCount) {
1.5599 + firstPos = mItemCount - 1;
1.5600 + }
1.5601 +
1.5602 + ss.position = firstPos;
1.5603 + ss.firstId = mAdapter.getItemId(firstPos);
1.5604 + } else {
1.5605 + ss.viewStart = 0;
1.5606 + ss.firstId = INVALID_POSITION;
1.5607 + ss.position = 0;
1.5608 + }
1.5609 +
1.5610 + if (mCheckStates != null) {
1.5611 + ss.checkState = cloneCheckStates();
1.5612 + }
1.5613 +
1.5614 + if (mCheckedIdStates != null) {
1.5615 + final LongSparseArray<Integer> idState = new LongSparseArray<Integer>();
1.5616 +
1.5617 + final int count = mCheckedIdStates.size();
1.5618 + for (int i = 0; i < count; i++) {
1.5619 + idState.put(mCheckedIdStates.keyAt(i), mCheckedIdStates.valueAt(i));
1.5620 + }
1.5621 +
1.5622 + ss.checkIdState = idState;
1.5623 + }
1.5624 +
1.5625 + ss.checkedItemCount = mCheckedItemCount;
1.5626 +
1.5627 + return ss;
1.5628 + }
1.5629 +
1.5630 + @Override
1.5631 + public void onRestoreInstanceState(Parcelable state) {
1.5632 + SavedState ss = (SavedState) state;
1.5633 + super.onRestoreInstanceState(ss.getSuperState());
1.5634 +
1.5635 + mDataChanged = true;
1.5636 + mSyncHeight = ss.height;
1.5637 +
1.5638 + if (ss.selectedId >= 0) {
1.5639 + mNeedSync = true;
1.5640 + mPendingSync = ss;
1.5641 + mSyncRowId = ss.selectedId;
1.5642 + mSyncPosition = ss.position;
1.5643 + mSpecificStart = ss.viewStart;
1.5644 + mSyncMode = SYNC_SELECTED_POSITION;
1.5645 + } else if (ss.firstId >= 0) {
1.5646 + setSelectedPositionInt(INVALID_POSITION);
1.5647 +
1.5648 + // Do this before setting mNeedSync since setNextSelectedPosition looks at mNeedSync
1.5649 + setNextSelectedPositionInt(INVALID_POSITION);
1.5650 +
1.5651 + mSelectorPosition = INVALID_POSITION;
1.5652 + mNeedSync = true;
1.5653 + mPendingSync = ss;
1.5654 + mSyncRowId = ss.firstId;
1.5655 + mSyncPosition = ss.position;
1.5656 + mSpecificStart = ss.viewStart;
1.5657 + mSyncMode = SYNC_FIRST_POSITION;
1.5658 + }
1.5659 +
1.5660 + if (ss.checkState != null) {
1.5661 + mCheckStates = ss.checkState;
1.5662 + }
1.5663 +
1.5664 + if (ss.checkIdState != null) {
1.5665 + mCheckedIdStates = ss.checkIdState;
1.5666 + }
1.5667 +
1.5668 + mCheckedItemCount = ss.checkedItemCount;
1.5669 +
1.5670 + requestLayout();
1.5671 + }
1.5672 +
1.5673 + public static class LayoutParams extends ViewGroup.LayoutParams {
1.5674 + /**
1.5675 + * Type of this view as reported by the adapter
1.5676 + */
1.5677 + int viewType;
1.5678 +
1.5679 + /**
1.5680 + * The stable ID of the item this view displays
1.5681 + */
1.5682 + long id = -1;
1.5683 +
1.5684 + /**
1.5685 + * The position the view was removed from when pulled out of the
1.5686 + * scrap heap.
1.5687 + * @hide
1.5688 + */
1.5689 + int scrappedFromPosition;
1.5690 +
1.5691 + /**
1.5692 + * When a TwoWayView is measured with an AT_MOST measure spec, it needs
1.5693 + * to obtain children views to measure itself. When doing so, the children
1.5694 + * are not attached to the window, but put in the recycler which assumes
1.5695 + * they've been attached before. Setting this flag will force the reused
1.5696 + * view to be attached to the window rather than just attached to the
1.5697 + * parent.
1.5698 + */
1.5699 + boolean forceAdd;
1.5700 +
1.5701 + public LayoutParams(int width, int height) {
1.5702 + super(width, height);
1.5703 +
1.5704 + if (this.width == MATCH_PARENT) {
1.5705 + Log.w(LOGTAG, "Constructing LayoutParams with width FILL_PARENT " +
1.5706 + "does not make much sense as the view might change orientation. " +
1.5707 + "Falling back to WRAP_CONTENT");
1.5708 + this.width = WRAP_CONTENT;
1.5709 + }
1.5710 +
1.5711 + if (this.height == MATCH_PARENT) {
1.5712 + Log.w(LOGTAG, "Constructing LayoutParams with height FILL_PARENT " +
1.5713 + "does not make much sense as the view might change orientation. " +
1.5714 + "Falling back to WRAP_CONTENT");
1.5715 + this.height = WRAP_CONTENT;
1.5716 + }
1.5717 + }
1.5718 +
1.5719 + public LayoutParams(Context c, AttributeSet attrs) {
1.5720 + super(c, attrs);
1.5721 +
1.5722 + if (this.width == MATCH_PARENT) {
1.5723 + Log.w(LOGTAG, "Inflation setting LayoutParams width to MATCH_PARENT - " +
1.5724 + "does not make much sense as the view might change orientation. " +
1.5725 + "Falling back to WRAP_CONTENT");
1.5726 + this.width = MATCH_PARENT;
1.5727 + }
1.5728 +
1.5729 + if (this.height == MATCH_PARENT) {
1.5730 + Log.w(LOGTAG, "Inflation setting LayoutParams height to MATCH_PARENT - " +
1.5731 + "does not make much sense as the view might change orientation. " +
1.5732 + "Falling back to WRAP_CONTENT");
1.5733 + this.height = WRAP_CONTENT;
1.5734 + }
1.5735 + }
1.5736 +
1.5737 + public LayoutParams(ViewGroup.LayoutParams other) {
1.5738 + super(other);
1.5739 +
1.5740 + if (this.width == MATCH_PARENT) {
1.5741 + Log.w(LOGTAG, "Constructing LayoutParams with height MATCH_PARENT - " +
1.5742 + "does not make much sense as the view might change orientation. " +
1.5743 + "Falling back to WRAP_CONTENT");
1.5744 + this.width = WRAP_CONTENT;
1.5745 + }
1.5746 +
1.5747 + if (this.height == MATCH_PARENT) {
1.5748 + Log.w(LOGTAG, "Constructing LayoutParams with height MATCH_PARENT - " +
1.5749 + "does not make much sense as the view might change orientation. " +
1.5750 + "Falling back to WRAP_CONTENT");
1.5751 + this.height = WRAP_CONTENT;
1.5752 + }
1.5753 + }
1.5754 + }
1.5755 +
1.5756 + class RecycleBin {
1.5757 + private RecyclerListener mRecyclerListener;
1.5758 + private int mFirstActivePosition;
1.5759 + private View[] mActiveViews = new View[0];
1.5760 + private ArrayList<View>[] mScrapViews;
1.5761 + private int mViewTypeCount;
1.5762 + private ArrayList<View> mCurrentScrap;
1.5763 + private SparseArrayCompat<View> mTransientStateViews;
1.5764 +
1.5765 + public void setViewTypeCount(int viewTypeCount) {
1.5766 + if (viewTypeCount < 1) {
1.5767 + throw new IllegalArgumentException("Can't have a viewTypeCount < 1");
1.5768 + }
1.5769 +
1.5770 + @SuppressWarnings({"unchecked", "rawtypes"})
1.5771 + ArrayList<View>[] scrapViews = new ArrayList[viewTypeCount];
1.5772 + for (int i = 0; i < viewTypeCount; i++) {
1.5773 + scrapViews[i] = new ArrayList<View>();
1.5774 + }
1.5775 +
1.5776 + mViewTypeCount = viewTypeCount;
1.5777 + mCurrentScrap = scrapViews[0];
1.5778 + mScrapViews = scrapViews;
1.5779 + }
1.5780 +
1.5781 + public void markChildrenDirty() {
1.5782 + if (mViewTypeCount == 1) {
1.5783 + final ArrayList<View> scrap = mCurrentScrap;
1.5784 + final int scrapCount = scrap.size();
1.5785 +
1.5786 + for (int i = 0; i < scrapCount; i++) {
1.5787 + scrap.get(i).forceLayout();
1.5788 + }
1.5789 + } else {
1.5790 + final int typeCount = mViewTypeCount;
1.5791 + for (int i = 0; i < typeCount; i++) {
1.5792 + final ArrayList<View> scrap = mScrapViews[i];
1.5793 + final int scrapCount = scrap.size();
1.5794 +
1.5795 + for (int j = 0; j < scrapCount; j++) {
1.5796 + scrap.get(j).forceLayout();
1.5797 + }
1.5798 + }
1.5799 + }
1.5800 +
1.5801 + if (mTransientStateViews != null) {
1.5802 + final int count = mTransientStateViews.size();
1.5803 + for (int i = 0; i < count; i++) {
1.5804 + mTransientStateViews.valueAt(i).forceLayout();
1.5805 + }
1.5806 + }
1.5807 + }
1.5808 +
1.5809 + public boolean shouldRecycleViewType(int viewType) {
1.5810 + return viewType >= 0;
1.5811 + }
1.5812 +
1.5813 + void clear() {
1.5814 + if (mViewTypeCount == 1) {
1.5815 + final ArrayList<View> scrap = mCurrentScrap;
1.5816 + final int scrapCount = scrap.size();
1.5817 +
1.5818 + for (int i = 0; i < scrapCount; i++) {
1.5819 + removeDetachedView(scrap.remove(scrapCount - 1 - i), false);
1.5820 + }
1.5821 + } else {
1.5822 + final int typeCount = mViewTypeCount;
1.5823 + for (int i = 0; i < typeCount; i++) {
1.5824 + final ArrayList<View> scrap = mScrapViews[i];
1.5825 + final int scrapCount = scrap.size();
1.5826 +
1.5827 + for (int j = 0; j < scrapCount; j++) {
1.5828 + removeDetachedView(scrap.remove(scrapCount - 1 - j), false);
1.5829 + }
1.5830 + }
1.5831 + }
1.5832 +
1.5833 + if (mTransientStateViews != null) {
1.5834 + mTransientStateViews.clear();
1.5835 + }
1.5836 + }
1.5837 +
1.5838 + void fillActiveViews(int childCount, int firstActivePosition) {
1.5839 + if (mActiveViews.length < childCount) {
1.5840 + mActiveViews = new View[childCount];
1.5841 + }
1.5842 +
1.5843 + mFirstActivePosition = firstActivePosition;
1.5844 +
1.5845 + final View[] activeViews = mActiveViews;
1.5846 + for (int i = 0; i < childCount; i++) {
1.5847 + View child = getChildAt(i);
1.5848 +
1.5849 + // Note: We do place AdapterView.ITEM_VIEW_TYPE_IGNORE in active views.
1.5850 + // However, we will NOT place them into scrap views.
1.5851 + activeViews[i] = child;
1.5852 + }
1.5853 + }
1.5854 +
1.5855 + View getActiveView(int position) {
1.5856 + final int index = position - mFirstActivePosition;
1.5857 + final View[] activeViews = mActiveViews;
1.5858 +
1.5859 + if (index >= 0 && index < activeViews.length) {
1.5860 + final View match = activeViews[index];
1.5861 + activeViews[index] = null;
1.5862 +
1.5863 + return match;
1.5864 + }
1.5865 +
1.5866 + return null;
1.5867 + }
1.5868 +
1.5869 + View getTransientStateView(int position) {
1.5870 + if (mTransientStateViews == null) {
1.5871 + return null;
1.5872 + }
1.5873 +
1.5874 + final int index = mTransientStateViews.indexOfKey(position);
1.5875 + if (index < 0) {
1.5876 + return null;
1.5877 + }
1.5878 +
1.5879 + final View result = mTransientStateViews.valueAt(index);
1.5880 + mTransientStateViews.removeAt(index);
1.5881 +
1.5882 + return result;
1.5883 + }
1.5884 +
1.5885 + void clearTransientStateViews() {
1.5886 + if (mTransientStateViews != null) {
1.5887 + mTransientStateViews.clear();
1.5888 + }
1.5889 + }
1.5890 +
1.5891 + View getScrapView(int position) {
1.5892 + if (mViewTypeCount == 1) {
1.5893 + return retrieveFromScrap(mCurrentScrap, position);
1.5894 + } else {
1.5895 + int whichScrap = mAdapter.getItemViewType(position);
1.5896 + if (whichScrap >= 0 && whichScrap < mScrapViews.length) {
1.5897 + return retrieveFromScrap(mScrapViews[whichScrap], position);
1.5898 + }
1.5899 + }
1.5900 +
1.5901 + return null;
1.5902 + }
1.5903 +
1.5904 + @TargetApi(14)
1.5905 + void addScrapView(View scrap, int position) {
1.5906 + LayoutParams lp = (LayoutParams) scrap.getLayoutParams();
1.5907 + if (lp == null) {
1.5908 + return;
1.5909 + }
1.5910 +
1.5911 + lp.scrappedFromPosition = position;
1.5912 +
1.5913 + final int viewType = lp.viewType;
1.5914 + final boolean scrapHasTransientState = ViewCompat.hasTransientState(scrap);
1.5915 +
1.5916 + // Don't put views that should be ignored into the scrap heap
1.5917 + if (!shouldRecycleViewType(viewType) || scrapHasTransientState) {
1.5918 + if (scrapHasTransientState) {
1.5919 + if (mTransientStateViews == null) {
1.5920 + mTransientStateViews = new SparseArrayCompat<View>();
1.5921 + }
1.5922 +
1.5923 + mTransientStateViews.put(position, scrap);
1.5924 + }
1.5925 +
1.5926 + return;
1.5927 + }
1.5928 +
1.5929 + if (mViewTypeCount == 1) {
1.5930 + mCurrentScrap.add(scrap);
1.5931 + } else {
1.5932 + mScrapViews[viewType].add(scrap);
1.5933 + }
1.5934 +
1.5935 + // FIXME: Unfortunately, ViewCompat.setAccessibilityDelegate() doesn't accept
1.5936 + // null delegates.
1.5937 + if (Build.VERSION.SDK_INT >= 14) {
1.5938 + scrap.setAccessibilityDelegate(null);
1.5939 + }
1.5940 +
1.5941 + if (mRecyclerListener != null) {
1.5942 + mRecyclerListener.onMovedToScrapHeap(scrap);
1.5943 + }
1.5944 + }
1.5945 +
1.5946 + @TargetApi(14)
1.5947 + void scrapActiveViews() {
1.5948 + final View[] activeViews = mActiveViews;
1.5949 + final boolean multipleScraps = (mViewTypeCount > 1);
1.5950 +
1.5951 + ArrayList<View> scrapViews = mCurrentScrap;
1.5952 + final int count = activeViews.length;
1.5953 +
1.5954 + for (int i = count - 1; i >= 0; i--) {
1.5955 + final View victim = activeViews[i];
1.5956 + if (victim != null) {
1.5957 + final LayoutParams lp = (LayoutParams) victim.getLayoutParams();
1.5958 + int whichScrap = lp.viewType;
1.5959 +
1.5960 + activeViews[i] = null;
1.5961 +
1.5962 + final boolean scrapHasTransientState = ViewCompat.hasTransientState(victim);
1.5963 + if (!shouldRecycleViewType(whichScrap) || scrapHasTransientState) {
1.5964 + if (scrapHasTransientState) {
1.5965 + removeDetachedView(victim, false);
1.5966 +
1.5967 + if (mTransientStateViews == null) {
1.5968 + mTransientStateViews = new SparseArrayCompat<View>();
1.5969 + }
1.5970 +
1.5971 + mTransientStateViews.put(mFirstActivePosition + i, victim);
1.5972 + }
1.5973 +
1.5974 + continue;
1.5975 + }
1.5976 +
1.5977 + if (multipleScraps) {
1.5978 + scrapViews = mScrapViews[whichScrap];
1.5979 + }
1.5980 +
1.5981 + lp.scrappedFromPosition = mFirstActivePosition + i;
1.5982 + scrapViews.add(victim);
1.5983 +
1.5984 + // FIXME: Unfortunately, ViewCompat.setAccessibilityDelegate() doesn't accept
1.5985 + // null delegates.
1.5986 + if (Build.VERSION.SDK_INT >= 14) {
1.5987 + victim.setAccessibilityDelegate(null);
1.5988 + }
1.5989 +
1.5990 + if (mRecyclerListener != null) {
1.5991 + mRecyclerListener.onMovedToScrapHeap(victim);
1.5992 + }
1.5993 + }
1.5994 + }
1.5995 +
1.5996 + pruneScrapViews();
1.5997 + }
1.5998 +
1.5999 + private void pruneScrapViews() {
1.6000 + final int maxViews = mActiveViews.length;
1.6001 + final int viewTypeCount = mViewTypeCount;
1.6002 + final ArrayList<View>[] scrapViews = mScrapViews;
1.6003 +
1.6004 + for (int i = 0; i < viewTypeCount; ++i) {
1.6005 + final ArrayList<View> scrapPile = scrapViews[i];
1.6006 + int size = scrapPile.size();
1.6007 + final int extras = size - maxViews;
1.6008 +
1.6009 + size--;
1.6010 +
1.6011 + for (int j = 0; j < extras; j++) {
1.6012 + removeDetachedView(scrapPile.remove(size--), false);
1.6013 + }
1.6014 + }
1.6015 +
1.6016 + if (mTransientStateViews != null) {
1.6017 + for (int i = 0; i < mTransientStateViews.size(); i++) {
1.6018 + final View v = mTransientStateViews.valueAt(i);
1.6019 + if (!ViewCompat.hasTransientState(v)) {
1.6020 + mTransientStateViews.removeAt(i);
1.6021 + i--;
1.6022 + }
1.6023 + }
1.6024 + }
1.6025 + }
1.6026 +
1.6027 + void reclaimScrapViews(List<View> views) {
1.6028 + if (mViewTypeCount == 1) {
1.6029 + views.addAll(mCurrentScrap);
1.6030 + } else {
1.6031 + final int viewTypeCount = mViewTypeCount;
1.6032 + final ArrayList<View>[] scrapViews = mScrapViews;
1.6033 +
1.6034 + for (int i = 0; i < viewTypeCount; ++i) {
1.6035 + final ArrayList<View> scrapPile = scrapViews[i];
1.6036 + views.addAll(scrapPile);
1.6037 + }
1.6038 + }
1.6039 + }
1.6040 +
1.6041 + View retrieveFromScrap(ArrayList<View> scrapViews, int position) {
1.6042 + int size = scrapViews.size();
1.6043 + if (size <= 0) {
1.6044 + return null;
1.6045 + }
1.6046 +
1.6047 + for (int i = 0; i < size; i++) {
1.6048 + final View scrapView = scrapViews.get(i);
1.6049 + final LayoutParams lp = (LayoutParams) scrapView.getLayoutParams();
1.6050 +
1.6051 + if (lp.scrappedFromPosition == position) {
1.6052 + scrapViews.remove(i);
1.6053 + return scrapView;
1.6054 + }
1.6055 + }
1.6056 +
1.6057 + return scrapViews.remove(size - 1);
1.6058 + }
1.6059 + }
1.6060 +
1.6061 + @Override
1.6062 + public void setEmptyView(View emptyView) {
1.6063 + super.setEmptyView(emptyView);
1.6064 + mEmptyView = emptyView;
1.6065 + updateEmptyStatus();
1.6066 + }
1.6067 +
1.6068 + @Override
1.6069 + public void setFocusable(boolean focusable) {
1.6070 + final ListAdapter adapter = getAdapter();
1.6071 + final boolean empty = (adapter == null || adapter.getCount() == 0);
1.6072 +
1.6073 + mDesiredFocusableState = focusable;
1.6074 + if (!focusable) {
1.6075 + mDesiredFocusableInTouchModeState = false;
1.6076 + }
1.6077 +
1.6078 + super.setFocusable(focusable && !empty);
1.6079 + }
1.6080 +
1.6081 + @Override
1.6082 + public void setFocusableInTouchMode(boolean focusable) {
1.6083 + final ListAdapter adapter = getAdapter();
1.6084 + final boolean empty = (adapter == null || adapter.getCount() == 0);
1.6085 +
1.6086 + mDesiredFocusableInTouchModeState = focusable;
1.6087 + if (focusable) {
1.6088 + mDesiredFocusableState = true;
1.6089 + }
1.6090 +
1.6091 + super.setFocusableInTouchMode(focusable && !empty);
1.6092 + }
1.6093 +
1.6094 + private void checkFocus() {
1.6095 + final ListAdapter adapter = getAdapter();
1.6096 + final boolean focusable = (adapter != null && adapter.getCount() > 0);
1.6097 +
1.6098 + // The order in which we set focusable in touch mode/focusable may matter
1.6099 + // for the client, see View.setFocusableInTouchMode() comments for more
1.6100 + // details
1.6101 + super.setFocusableInTouchMode(focusable && mDesiredFocusableInTouchModeState);
1.6102 + super.setFocusable(focusable && mDesiredFocusableState);
1.6103 +
1.6104 + if (mEmptyView != null) {
1.6105 + updateEmptyStatus();
1.6106 + }
1.6107 + }
1.6108 +
1.6109 + private void updateEmptyStatus() {
1.6110 + final boolean isEmpty = (mAdapter == null || mAdapter.isEmpty());
1.6111 +
1.6112 + if (isEmpty) {
1.6113 + if (mEmptyView != null) {
1.6114 + mEmptyView.setVisibility(View.VISIBLE);
1.6115 + setVisibility(View.GONE);
1.6116 + } else {
1.6117 + // If the caller just removed our empty view, make sure the list
1.6118 + // view is visible
1.6119 + setVisibility(View.VISIBLE);
1.6120 + }
1.6121 +
1.6122 + // We are now GONE, so pending layouts will not be dispatched.
1.6123 + // Force one here to make sure that the state of the list matches
1.6124 + // the state of the adapter.
1.6125 + if (mDataChanged) {
1.6126 + onLayout(false, getLeft(), getTop(), getRight(), getBottom());
1.6127 + }
1.6128 + } else {
1.6129 + if (mEmptyView != null) {
1.6130 + mEmptyView.setVisibility(View.GONE);
1.6131 + }
1.6132 +
1.6133 + setVisibility(View.VISIBLE);
1.6134 + }
1.6135 + }
1.6136 +
1.6137 + private class AdapterDataSetObserver extends DataSetObserver {
1.6138 + private Parcelable mInstanceState = null;
1.6139 +
1.6140 + @Override
1.6141 + public void onChanged() {
1.6142 + mDataChanged = true;
1.6143 + mOldItemCount = mItemCount;
1.6144 + mItemCount = getAdapter().getCount();
1.6145 +
1.6146 + // Detect the case where a cursor that was previously invalidated has
1.6147 + // been re-populated with new data.
1.6148 + if (TwoWayView.this.mHasStableIds && mInstanceState != null
1.6149 + && mOldItemCount == 0 && mItemCount > 0) {
1.6150 + TwoWayView.this.onRestoreInstanceState(mInstanceState);
1.6151 + mInstanceState = null;
1.6152 + } else {
1.6153 + rememberSyncState();
1.6154 + }
1.6155 +
1.6156 + checkFocus();
1.6157 + requestLayout();
1.6158 + }
1.6159 +
1.6160 + @Override
1.6161 + public void onInvalidated() {
1.6162 + mDataChanged = true;
1.6163 +
1.6164 + if (TwoWayView.this.mHasStableIds) {
1.6165 + // Remember the current state for the case where our hosting activity is being
1.6166 + // stopped and later restarted
1.6167 + mInstanceState = TwoWayView.this.onSaveInstanceState();
1.6168 + }
1.6169 +
1.6170 + // Data is invalid so we should reset our state
1.6171 + mOldItemCount = mItemCount;
1.6172 + mItemCount = 0;
1.6173 +
1.6174 + mSelectedPosition = INVALID_POSITION;
1.6175 + mSelectedRowId = INVALID_ROW_ID;
1.6176 +
1.6177 + mNextSelectedPosition = INVALID_POSITION;
1.6178 + mNextSelectedRowId = INVALID_ROW_ID;
1.6179 +
1.6180 + mNeedSync = false;
1.6181 +
1.6182 + checkFocus();
1.6183 + requestLayout();
1.6184 + }
1.6185 + }
1.6186 +
1.6187 + static class SavedState extends BaseSavedState {
1.6188 + long selectedId;
1.6189 + long firstId;
1.6190 + int viewStart;
1.6191 + int position;
1.6192 + int height;
1.6193 + int checkedItemCount;
1.6194 + SparseBooleanArray checkState;
1.6195 + LongSparseArray<Integer> checkIdState;
1.6196 +
1.6197 + /**
1.6198 + * Constructor called from {@link TwoWayView#onSaveInstanceState()}
1.6199 + */
1.6200 + SavedState(Parcelable superState) {
1.6201 + super(superState);
1.6202 + }
1.6203 +
1.6204 + /**
1.6205 + * Constructor called from {@link #CREATOR}
1.6206 + */
1.6207 + private SavedState(Parcel in) {
1.6208 + super(in);
1.6209 +
1.6210 + selectedId = in.readLong();
1.6211 + firstId = in.readLong();
1.6212 + viewStart = in.readInt();
1.6213 + position = in.readInt();
1.6214 + height = in.readInt();
1.6215 +
1.6216 + checkedItemCount = in.readInt();
1.6217 + checkState = in.readSparseBooleanArray();
1.6218 +
1.6219 + final int N = in.readInt();
1.6220 + if (N > 0) {
1.6221 + checkIdState = new LongSparseArray<Integer>();
1.6222 + for (int i = 0; i < N; i++) {
1.6223 + final long key = in.readLong();
1.6224 + final int value = in.readInt();
1.6225 + checkIdState.put(key, value);
1.6226 + }
1.6227 + }
1.6228 + }
1.6229 +
1.6230 + @Override
1.6231 + public void writeToParcel(Parcel out, int flags) {
1.6232 + super.writeToParcel(out, flags);
1.6233 +
1.6234 + out.writeLong(selectedId);
1.6235 + out.writeLong(firstId);
1.6236 + out.writeInt(viewStart);
1.6237 + out.writeInt(position);
1.6238 + out.writeInt(height);
1.6239 +
1.6240 + out.writeInt(checkedItemCount);
1.6241 + out.writeSparseBooleanArray(checkState);
1.6242 +
1.6243 + final int N = checkIdState != null ? checkIdState.size() : 0;
1.6244 + out.writeInt(N);
1.6245 +
1.6246 + for (int i = 0; i < N; i++) {
1.6247 + out.writeLong(checkIdState.keyAt(i));
1.6248 + out.writeInt(checkIdState.valueAt(i));
1.6249 + }
1.6250 + }
1.6251 +
1.6252 + @Override
1.6253 + public String toString() {
1.6254 + return "TwoWayView.SavedState{"
1.6255 + + Integer.toHexString(System.identityHashCode(this))
1.6256 + + " selectedId=" + selectedId
1.6257 + + " firstId=" + firstId
1.6258 + + " viewStart=" + viewStart
1.6259 + + " height=" + height
1.6260 + + " position=" + position
1.6261 + + " checkState=" + checkState + "}";
1.6262 + }
1.6263 +
1.6264 + public static final Parcelable.Creator<SavedState> CREATOR
1.6265 + = new Parcelable.Creator<SavedState>() {
1.6266 + @Override
1.6267 + public SavedState createFromParcel(Parcel in) {
1.6268 + return new SavedState(in);
1.6269 + }
1.6270 +
1.6271 + @Override
1.6272 + public SavedState[] newArray(int size) {
1.6273 + return new SavedState[size];
1.6274 + }
1.6275 + };
1.6276 + }
1.6277 +
1.6278 + private class SelectionNotifier implements Runnable {
1.6279 + @Override
1.6280 + public void run() {
1.6281 + if (mDataChanged) {
1.6282 + // Data has changed between when this SelectionNotifier
1.6283 + // was posted and now. We need to wait until the AdapterView
1.6284 + // has been synched to the new data.
1.6285 + if (mAdapter != null) {
1.6286 + post(this);
1.6287 + }
1.6288 + } else {
1.6289 + fireOnSelected();
1.6290 + performAccessibilityActionsOnSelected();
1.6291 + }
1.6292 + }
1.6293 + }
1.6294 +
1.6295 + private class WindowRunnnable {
1.6296 + private int mOriginalAttachCount;
1.6297 +
1.6298 + public void rememberWindowAttachCount() {
1.6299 + mOriginalAttachCount = getWindowAttachCount();
1.6300 + }
1.6301 +
1.6302 + public boolean sameWindow() {
1.6303 + return hasWindowFocus() && getWindowAttachCount() == mOriginalAttachCount;
1.6304 + }
1.6305 + }
1.6306 +
1.6307 + private class PerformClick extends WindowRunnnable implements Runnable {
1.6308 + int mClickMotionPosition;
1.6309 +
1.6310 + @Override
1.6311 + public void run() {
1.6312 + if (mDataChanged) {
1.6313 + return;
1.6314 + }
1.6315 +
1.6316 + final ListAdapter adapter = mAdapter;
1.6317 + final int motionPosition = mClickMotionPosition;
1.6318 +
1.6319 + if (adapter != null && mItemCount > 0 &&
1.6320 + motionPosition != INVALID_POSITION &&
1.6321 + motionPosition < adapter.getCount() && sameWindow()) {
1.6322 +
1.6323 + final View child = getChildAt(motionPosition - mFirstPosition);
1.6324 + if (child != null) {
1.6325 + performItemClick(child, motionPosition, adapter.getItemId(motionPosition));
1.6326 + }
1.6327 + }
1.6328 + }
1.6329 + }
1.6330 +
1.6331 + private final class CheckForTap implements Runnable {
1.6332 + @Override
1.6333 + public void run() {
1.6334 + if (mTouchMode != TOUCH_MODE_DOWN) {
1.6335 + return;
1.6336 + }
1.6337 +
1.6338 + mTouchMode = TOUCH_MODE_TAP;
1.6339 +
1.6340 + final View child = getChildAt(mMotionPosition - mFirstPosition);
1.6341 + if (child != null && !child.hasFocusable()) {
1.6342 + mLayoutMode = LAYOUT_NORMAL;
1.6343 +
1.6344 + if (!mDataChanged) {
1.6345 + setPressed(true);
1.6346 + child.setPressed(true);
1.6347 +
1.6348 + layoutChildren();
1.6349 + positionSelector(mMotionPosition, child);
1.6350 + refreshDrawableState();
1.6351 +
1.6352 + positionSelector(mMotionPosition, child);
1.6353 + refreshDrawableState();
1.6354 +
1.6355 + final boolean longClickable = isLongClickable();
1.6356 +
1.6357 + if (mSelector != null) {
1.6358 + Drawable d = mSelector.getCurrent();
1.6359 +
1.6360 + if (d != null && d instanceof TransitionDrawable) {
1.6361 + if (longClickable) {
1.6362 + final int longPressTimeout = ViewConfiguration.getLongPressTimeout();
1.6363 + ((TransitionDrawable) d).startTransition(longPressTimeout);
1.6364 + } else {
1.6365 + ((TransitionDrawable) d).resetTransition();
1.6366 + }
1.6367 + }
1.6368 + }
1.6369 +
1.6370 + if (longClickable) {
1.6371 + triggerCheckForLongPress();
1.6372 + } else {
1.6373 + mTouchMode = TOUCH_MODE_DONE_WAITING;
1.6374 + }
1.6375 + } else {
1.6376 + mTouchMode = TOUCH_MODE_DONE_WAITING;
1.6377 + }
1.6378 + }
1.6379 + }
1.6380 + }
1.6381 +
1.6382 + private class CheckForLongPress extends WindowRunnnable implements Runnable {
1.6383 + @Override
1.6384 + public void run() {
1.6385 + final int motionPosition = mMotionPosition;
1.6386 + final View child = getChildAt(motionPosition - mFirstPosition);
1.6387 +
1.6388 + if (child != null) {
1.6389 + final long longPressId = mAdapter.getItemId(mMotionPosition);
1.6390 +
1.6391 + boolean handled = false;
1.6392 + if (sameWindow() && !mDataChanged) {
1.6393 + handled = performLongPress(child, motionPosition, longPressId);
1.6394 + }
1.6395 +
1.6396 + if (handled) {
1.6397 + mTouchMode = TOUCH_MODE_REST;
1.6398 + setPressed(false);
1.6399 + child.setPressed(false);
1.6400 + } else {
1.6401 + mTouchMode = TOUCH_MODE_DONE_WAITING;
1.6402 + }
1.6403 + }
1.6404 + }
1.6405 + }
1.6406 +
1.6407 + private class CheckForKeyLongPress extends WindowRunnnable implements Runnable {
1.6408 + public void run() {
1.6409 + if (!isPressed() || mSelectedPosition < 0) {
1.6410 + return;
1.6411 + }
1.6412 +
1.6413 + final int index = mSelectedPosition - mFirstPosition;
1.6414 + final View v = getChildAt(index);
1.6415 +
1.6416 + if (!mDataChanged) {
1.6417 + boolean handled = false;
1.6418 +
1.6419 + if (sameWindow()) {
1.6420 + handled = performLongPress(v, mSelectedPosition, mSelectedRowId);
1.6421 + }
1.6422 +
1.6423 + if (handled) {
1.6424 + setPressed(false);
1.6425 + v.setPressed(false);
1.6426 + }
1.6427 + } else {
1.6428 + setPressed(false);
1.6429 +
1.6430 + if (v != null) {
1.6431 + v.setPressed(false);
1.6432 + }
1.6433 + }
1.6434 + }
1.6435 + }
1.6436 +
1.6437 + private static class ArrowScrollFocusResult {
1.6438 + private int mSelectedPosition;
1.6439 + private int mAmountToScroll;
1.6440 +
1.6441 + /**
1.6442 + * How {@link TwoWayView#arrowScrollFocused} returns its values.
1.6443 + */
1.6444 + void populate(int selectedPosition, int amountToScroll) {
1.6445 + mSelectedPosition = selectedPosition;
1.6446 + mAmountToScroll = amountToScroll;
1.6447 + }
1.6448 +
1.6449 + public int getSelectedPosition() {
1.6450 + return mSelectedPosition;
1.6451 + }
1.6452 +
1.6453 + public int getAmountToScroll() {
1.6454 + return mAmountToScroll;
1.6455 + }
1.6456 + }
1.6457 +
1.6458 + private class ListItemAccessibilityDelegate extends AccessibilityDelegateCompat {
1.6459 + @Override
1.6460 + public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) {
1.6461 + super.onInitializeAccessibilityNodeInfo(host, info);
1.6462 +
1.6463 + final int position = getPositionForView(host);
1.6464 + final ListAdapter adapter = getAdapter();
1.6465 +
1.6466 + // Cannot perform actions on invalid items
1.6467 + if (position == INVALID_POSITION || adapter == null) {
1.6468 + return;
1.6469 + }
1.6470 +
1.6471 + // Cannot perform actions on disabled items
1.6472 + if (!isEnabled() || !adapter.isEnabled(position)) {
1.6473 + return;
1.6474 + }
1.6475 +
1.6476 + if (position == getSelectedItemPosition()) {
1.6477 + info.setSelected(true);
1.6478 + info.addAction(AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION);
1.6479 + } else {
1.6480 + info.addAction(AccessibilityNodeInfoCompat.ACTION_SELECT);
1.6481 + }
1.6482 +
1.6483 + if (isClickable()) {
1.6484 + info.addAction(AccessibilityNodeInfoCompat.ACTION_CLICK);
1.6485 + info.setClickable(true);
1.6486 + }
1.6487 +
1.6488 + if (isLongClickable()) {
1.6489 + info.addAction(AccessibilityNodeInfoCompat.ACTION_LONG_CLICK);
1.6490 + info.setLongClickable(true);
1.6491 + }
1.6492 + }
1.6493 +
1.6494 + @Override
1.6495 + public boolean performAccessibilityAction(View host, int action, Bundle arguments) {
1.6496 + if (super.performAccessibilityAction(host, action, arguments)) {
1.6497 + return true;
1.6498 + }
1.6499 +
1.6500 + final int position = getPositionForView(host);
1.6501 + final ListAdapter adapter = getAdapter();
1.6502 +
1.6503 + // Cannot perform actions on invalid items
1.6504 + if (position == INVALID_POSITION || adapter == null) {
1.6505 + return false;
1.6506 + }
1.6507 +
1.6508 + // Cannot perform actions on disabled items
1.6509 + if (!isEnabled() || !adapter.isEnabled(position)) {
1.6510 + return false;
1.6511 + }
1.6512 +
1.6513 + final long id = getItemIdAtPosition(position);
1.6514 +
1.6515 + switch (action) {
1.6516 + case AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION:
1.6517 + if (getSelectedItemPosition() == position) {
1.6518 + setSelection(INVALID_POSITION);
1.6519 + return true;
1.6520 + }
1.6521 + return false;
1.6522 +
1.6523 + case AccessibilityNodeInfoCompat.ACTION_SELECT:
1.6524 + if (getSelectedItemPosition() != position) {
1.6525 + setSelection(position);
1.6526 + return true;
1.6527 + }
1.6528 + return false;
1.6529 +
1.6530 + case AccessibilityNodeInfoCompat.ACTION_CLICK:
1.6531 + if (isClickable()) {
1.6532 + return performItemClick(host, position, id);
1.6533 + }
1.6534 + return false;
1.6535 +
1.6536 + case AccessibilityNodeInfoCompat.ACTION_LONG_CLICK:
1.6537 + if (isLongClickable()) {
1.6538 + return performLongPress(host, position, id);
1.6539 + }
1.6540 + return false;
1.6541 + }
1.6542 +
1.6543 + return false;
1.6544 + }
1.6545 + }
1.6546 +}
