Workspace.java revision 9ccafbff26f5835ab9725d876d1bf7ccd08ccf84 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.launcher3;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.LayoutTransition;
23import android.animation.ObjectAnimator;
24import android.animation.PropertyValuesHolder;
25import android.animation.ValueAnimator;
26import android.animation.ValueAnimator.AnimatorUpdateListener;
27import android.annotation.SuppressLint;
28import android.app.WallpaperManager;
29import android.appwidget.AppWidgetHostView;
30import android.appwidget.AppWidgetProviderInfo;
31import android.content.Context;
32import android.content.res.Resources;
33import android.graphics.Bitmap;
34import android.graphics.Canvas;
35import android.graphics.Point;
36import android.graphics.PointF;
37import android.graphics.Rect;
38import android.graphics.drawable.Drawable;
39import android.os.Handler;
40import android.os.IBinder;
41import android.os.Parcelable;
42import android.util.AttributeSet;
43import android.util.Log;
44import android.util.Property;
45import android.util.SparseArray;
46import android.view.MotionEvent;
47import android.view.View;
48import android.view.ViewDebug;
49import android.view.ViewGroup;
50import android.view.accessibility.AccessibilityManager;
51import android.view.animation.DecelerateInterpolator;
52import android.view.animation.Interpolator;
53import android.widget.TextView;
54import android.widget.Toast;
55
56import com.android.launcher3.Launcher.CustomContentCallbacks;
57import com.android.launcher3.Launcher.LauncherOverlay;
58import com.android.launcher3.UninstallDropTarget.DropTargetSource;
59import com.android.launcher3.accessibility.AccessibleDragListenerAdapter;
60import com.android.launcher3.accessibility.OverviewAccessibilityDelegate;
61import com.android.launcher3.accessibility.OverviewScreenAccessibilityDelegate;
62import com.android.launcher3.accessibility.WorkspaceAccessibilityHelper;
63import com.android.launcher3.compat.AppWidgetManagerCompat;
64import com.android.launcher3.compat.UserHandleCompat;
65import com.android.launcher3.config.FeatureFlags;
66import com.android.launcher3.config.ProviderConfig;
67import com.android.launcher3.dragndrop.DragController;
68import com.android.launcher3.dragndrop.DragLayer;
69import com.android.launcher3.dragndrop.DragOptions;
70import com.android.launcher3.dragndrop.DragScroller;
71import com.android.launcher3.dragndrop.DragView;
72import com.android.launcher3.dragndrop.SpringLoadedDragController;
73import com.android.launcher3.folder.Folder;
74import com.android.launcher3.folder.FolderIcon;
75import com.android.launcher3.graphics.DragPreviewProvider;
76import com.android.launcher3.shortcuts.DeepShortcutsContainer;
77import com.android.launcher3.userevent.nano.LauncherLogProto;
78import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
79import com.android.launcher3.util.ItemInfoMatcher;
80import com.android.launcher3.util.LongArrayMap;
81import com.android.launcher3.util.MultiStateAlphaController;
82import com.android.launcher3.util.Thunk;
83import com.android.launcher3.util.VerticalFlingDetector;
84import com.android.launcher3.util.WallpaperOffsetInterpolator;
85import com.android.launcher3.widget.PendingAddShortcutInfo;
86import com.android.launcher3.widget.PendingAddWidgetInfo;
87
88import java.util.ArrayList;
89import java.util.HashMap;
90import java.util.HashSet;
91
92/**
93 * The workspace is a wide area with a wallpaper and a finite number of pages.
94 * Each page contains a number of icons, folders or widgets the user can
95 * interact with. A workspace is meant to be used with a fixed width only.
96 */
97public class Workspace extends PagedView
98        implements DropTarget, DragSource, DragScroller, View.OnTouchListener,
99        DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener,
100        Insettable, DropTargetSource {
101    private static final String TAG = "Launcher.Workspace";
102
103    private static boolean ENFORCE_DRAG_EVENT_ORDER = false;
104
105    private static final int SNAP_OFF_EMPTY_SCREEN_DURATION = 400;
106    private static final int FADE_EMPTY_SCREEN_DURATION = 150;
107
108    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
109
110    private static final boolean MAP_NO_RECURSE = false;
111    private static final boolean MAP_RECURSE = true;
112
113    // The screen id used for the empty screen always present to the right.
114    public static final long EXTRA_EMPTY_SCREEN_ID = -201;
115    // The is the first screen. It is always present, even if its empty.
116    public static final long FIRST_SCREEN_ID = 0;
117
118    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
119
120    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
121    private long mTouchDownTime = -1;
122    private long mCustomContentShowTime = -1;
123
124    private LayoutTransition mLayoutTransition;
125    @Thunk final WallpaperManager mWallpaperManager;
126
127    private ShortcutAndWidgetContainer mDragSourceInternal;
128
129    @Thunk LongArrayMap<CellLayout> mWorkspaceScreens = new LongArrayMap<>();
130    @Thunk ArrayList<Long> mScreenOrder = new ArrayList<Long>();
131
132    @Thunk Runnable mRemoveEmptyScreenRunnable;
133    @Thunk boolean mDeferRemoveExtraEmptyScreen = false;
134
135    /**
136     * CellInfo for the cell that is currently being dragged
137     */
138    private CellLayout.CellInfo mDragInfo;
139
140    /**
141     * Target drop area calculated during last acceptDrop call.
142     */
143    @Thunk int[] mTargetCell = new int[2];
144    private int mDragOverX = -1;
145    private int mDragOverY = -1;
146
147    CustomContentCallbacks mCustomContentCallbacks;
148    boolean mCustomContentShowing;
149    private float mLastCustomContentScrollProgress = -1f;
150    private String mCustomContentDescription = "";
151
152    /**
153     * The CellLayout that is currently being dragged over
154     */
155    @Thunk CellLayout mDragTargetLayout = null;
156    /**
157     * The CellLayout that we will show as highlighted
158     */
159    private CellLayout mDragOverlappingLayout = null;
160
161    /**
162     * The CellLayout which will be dropped to
163     */
164    private CellLayout mDropToLayout = null;
165
166    @Thunk Launcher mLauncher;
167    @Thunk IconCache mIconCache;
168    @Thunk DragController mDragController;
169
170    // These are temporary variables to prevent having to allocate a new object just to
171    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
172    private static final Rect sTempRect = new Rect();
173
174    private final int[] mTempXY = new int[2];
175    @Thunk float[] mDragViewVisualCenter = new float[2];
176    private float[] mTempCellLayoutCenterCoordinates = new float[2];
177
178    private SpringLoadedDragController mSpringLoadedDragController;
179    private float mOverviewModeShrinkFactor;
180
181    // State variable that indicates whether the pages are small (ie when you're
182    // in all apps or customize mode)
183
184    public enum State {
185        NORMAL          (false, false),
186        NORMAL_HIDDEN   (false, false),
187        SPRING_LOADED   (false, true),
188        OVERVIEW        (true, true),
189        OVERVIEW_HIDDEN (true, false);
190
191        public final boolean shouldUpdateWidget;
192        public final boolean hasMultipleVisiblePages;
193
194        State(boolean shouldUpdateWidget, boolean hasMultipleVisiblePages) {
195            this.shouldUpdateWidget = shouldUpdateWidget;
196            this.hasMultipleVisiblePages = hasMultipleVisiblePages;
197        }
198    }
199
200    // Direction used for moving the workspace and hotseat UI
201    public enum Direction {
202        X  (TRANSLATION_X),
203        Y  (TRANSLATION_Y);
204
205        private final Property<View, Float> viewProperty;
206
207        Direction(Property<View, Float> viewProperty) {
208            this.viewProperty = viewProperty;
209        }
210    }
211
212    private static final int HOTSEAT_STATE_ALPHA_INDEX = 2;
213
214    /**
215     * These values correspond to {@link Direction#X} & {@link Direction#Y}
216     */
217    private float[] mPageAlpha = new float[] {1, 1};
218    /**
219     * Hotseat alpha can be changed when moving horizontally, vertically, changing states.
220     * The values correspond to {@link Direction#X}, {@link Direction#Y} &
221     * {@link #HOTSEAT_STATE_ALPHA_INDEX} respectively.
222     */
223    private float[] mHotseatAlpha = new float[] {1, 1, 1};
224
225    public static final int QSB_ALPHA_INDEX_STATE_CHANGE = 0;
226    public static final int QSB_ALPHA_INDEX_Y_TRANSLATION = 1;
227    public static final int QSB_ALPHA_INDEX_PAGE_SCROLL = 2;
228    public static final int QSB_ALPHA_INDEX_OVERLAY_SCROLL = 3;
229
230
231    MultiStateAlphaController mQsbAlphaController;
232
233    @ViewDebug.ExportedProperty(category = "launcher")
234    private State mState = State.NORMAL;
235    private boolean mIsSwitchingState = false;
236
237    boolean mAnimatingViewIntoPlace = false;
238    boolean mChildrenLayersEnabled = true;
239
240    private boolean mStripScreensOnPageStopMoving = false;
241
242    /** Is the user is dragging an item near the edge of a page? */
243    private boolean mInScrollArea = false;
244
245    private DragPreviewProvider mOutlineProvider = null;
246    public static final int DRAG_BITMAP_PADDING = DragPreviewProvider.DRAG_BITMAP_PADDING;
247    private boolean mWorkspaceFadeInAdjacentScreens;
248
249    final WallpaperOffsetInterpolator mWallpaperOffset;
250    private boolean mUnlockWallpaperFromDefaultPageOnLayout;
251
252    @Thunk Runnable mDelayedResizeRunnable;
253    private Runnable mDelayedSnapToPageRunnable;
254
255    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
256    private static final int FOLDER_CREATION_TIMEOUT = 0;
257    public static final int REORDER_TIMEOUT = 350;
258    private final Alarm mFolderCreationAlarm = new Alarm();
259    private final Alarm mReorderAlarm = new Alarm();
260    private FolderIcon.PreviewBackground mFolderCreateBg;
261    private FolderIcon mDragOverFolderIcon = null;
262    private boolean mCreateUserFolderOnDrop = false;
263    private boolean mAddToExistingFolderOnDrop = false;
264    private float mMaxDistanceForFolderCreation;
265
266    private final Canvas mCanvas = new Canvas();
267
268    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
269    private float mXDown;
270    private float mYDown;
271    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
272    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
273    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
274
275    // Relating to the animation of items being dropped externally
276    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
277    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
278    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
279    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
280    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
281
282    // Related to dragging, folder creation and reordering
283    private static final int DRAG_MODE_NONE = 0;
284    private static final int DRAG_MODE_CREATE_FOLDER = 1;
285    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
286    private static final int DRAG_MODE_REORDER = 3;
287    private int mDragMode = DRAG_MODE_NONE;
288    @Thunk int mLastReorderX = -1;
289    @Thunk int mLastReorderY = -1;
290
291    private SparseArray<Parcelable> mSavedStates;
292    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
293
294    private float mCurrentScale;
295    private float mTransitionProgress;
296
297    @Thunk Runnable mDeferredAction;
298    private boolean mDeferDropAfterUninstall;
299    private boolean mUninstallSuccessful;
300
301    // State related to Launcher Overlay
302    LauncherOverlay mLauncherOverlay;
303    boolean mScrollInteractionBegan;
304    boolean mStartedSendingScrollEvents;
305    float mLastOverlayScroll = 0;
306    // Total over scrollX in the overlay direction.
307    private int mUnboundedScrollX;
308    private boolean mForceDrawAdjacentPages = false;
309    // Total over scrollX in the overlay direction.
310    private float mOverlayTranslation;
311    private int mFirstPageScrollX;
312    private boolean mIgnoreQsbScroll;
313
314    // Handles workspace state transitions
315    private WorkspaceStateTransitionAnimation mStateTransitionAnimation;
316
317    private AccessibilityDelegate mPagesAccessibilityDelegate;
318    private OnStateChangeListener mOnStateChangeListener;
319
320    /**
321     * Used to inflate the Workspace from XML.
322     *
323     * @param context The application's context.
324     * @param attrs The attributes set containing the Workspace's customization values.
325     */
326    public Workspace(Context context, AttributeSet attrs) {
327        this(context, attrs, 0);
328    }
329
330    /**
331     * Used to inflate the Workspace from XML.
332     *
333     * @param context The application's context.
334     * @param attrs The attributes set containing the Workspace's customization values.
335     * @param defStyle Unused.
336     */
337    public Workspace(Context context, AttributeSet attrs, int defStyle) {
338        super(context, attrs, defStyle);
339
340        mLauncher = Launcher.getLauncher(context);
341        mStateTransitionAnimation = new WorkspaceStateTransitionAnimation(mLauncher, this);
342        final Resources res = getResources();
343        DeviceProfile grid = mLauncher.getDeviceProfile();
344        mWorkspaceFadeInAdjacentScreens = grid.shouldFadeAdjacentWorkspaceScreens();
345        mWallpaperManager = WallpaperManager.getInstance(context);
346
347        mWallpaperOffset = new WallpaperOffsetInterpolator(this);
348        mOverviewModeShrinkFactor =
349                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100f;
350
351        setOnHierarchyChangeListener(this);
352        setHapticFeedbackEnabled(false);
353
354        initWorkspace();
355
356        // Disable multitouch across the workspace/all apps/customize tray
357        setMotionEventSplittingEnabled(true);
358    }
359
360    @Override
361    public void setInsets(Rect insets) {
362        mInsets.set(insets);
363
364        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
365        if (customScreen != null) {
366            View customContent = customScreen.getShortcutsAndWidgets().getChildAt(0);
367            if (customContent instanceof Insettable) {
368                ((Insettable) customContent).setInsets(mInsets);
369            }
370        }
371    }
372
373    public void setOnStateChangeListener(OnStateChangeListener listener) {
374        mOnStateChangeListener = listener;
375    }
376
377    // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each
378    // dimension if unsuccessful
379    public int[] estimateItemSize(ItemInfo itemInfo, boolean springLoaded) {
380        float shrinkFactor = mLauncher.getDeviceProfile().workspaceSpringLoadShrinkFactor;
381        int[] size = new int[2];
382        if (getChildCount() > 0) {
383            // Use the first non-custom page to estimate the child position
384            CellLayout cl = (CellLayout) getChildAt(numCustomPages());
385            Rect r = estimateItemPosition(cl, 0, 0, itemInfo.spanX, itemInfo.spanY);
386            size[0] = r.width();
387            size[1] = r.height();
388            if (springLoaded) {
389                size[0] *= shrinkFactor;
390                size[1] *= shrinkFactor;
391            }
392            return size;
393        } else {
394            size[0] = Integer.MAX_VALUE;
395            size[1] = Integer.MAX_VALUE;
396            return size;
397        }
398    }
399
400    public Rect estimateItemPosition(CellLayout cl, int hCell, int vCell, int hSpan, int vSpan) {
401        Rect r = new Rect();
402        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
403        return r;
404    }
405
406    @Override
407    public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
408        if (ENFORCE_DRAG_EVENT_ORDER) {
409            enforceDragParity("onDragStart", 0, 0);
410        }
411
412        if (mDragInfo != null && mDragInfo.cell != null) {
413            CellLayout layout = (CellLayout) mDragInfo.cell.getParent().getParent();
414            layout.markCellsAsUnoccupiedForView(mDragInfo.cell);
415        }
416
417        if (mOutlineProvider != null) {
418            // The outline is used to visualize where the item will land if dropped
419            mOutlineProvider.generateDragOutline(mCanvas);
420        }
421
422        updateChildrenLayersEnabled(false);
423        mLauncher.onDragStarted();
424        mLauncher.lockScreenOrientation();
425        mLauncher.onInteractionBegin();
426        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
427        InstallShortcutReceiver.enableInstallQueue();
428
429        // Do not add a new page if it is a accessible drag which was not started by the workspace.
430        // We do not support accessibility drag from other sources and instead provide a direct
431        // action for move/add to homescreen.
432        // When a accessible drag is started by the folder, we only allow rearranging withing the
433        // folder.
434        boolean addNewPage = !(options.isAccessibleDrag && dragObject.dragSource != this);
435
436        if (addNewPage) {
437            mDeferRemoveExtraEmptyScreen = false;
438            addExtraEmptyScreenOnDrag();
439
440            if (dragObject.dragInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
441                    && dragObject.dragSource != this) {
442                // When dragging a widget from different source, move to a page which has
443                // enough space to place this widget (after rearranging/resizing). We special case
444                // widgets as they cannot be placed inside a folder.
445                // Start at the current page and search right (on LTR) until finding a page with
446                // enough space. Since an empty screen is the furthest right, a page must be found.
447                int currentPage = getPageNearestToCenterOfScreen();
448                for (int pageIndex = currentPage; pageIndex < getPageCount(); pageIndex++) {
449                    CellLayout page = (CellLayout) getPageAt(pageIndex);
450                    if (page.hasReorderSolution(dragObject.dragInfo)) {
451                        setCurrentPage(pageIndex);
452                        break;
453                    }
454                }
455            }
456        }
457
458        if (!FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND) {
459            // Always enter the spring loaded mode
460            mLauncher.enterSpringLoadedDragMode();
461        }
462    }
463
464    public void deferRemoveExtraEmptyScreen() {
465        mDeferRemoveExtraEmptyScreen = true;
466    }
467
468    @Override
469    public void onDragEnd() {
470        if (ENFORCE_DRAG_EVENT_ORDER) {
471            enforceDragParity("onDragEnd", 0, 0);
472        }
473
474        if (!mDeferRemoveExtraEmptyScreen) {
475            removeExtraEmptyScreen(true, mDragSourceInternal != null);
476        }
477
478        updateChildrenLayersEnabled(false);
479        mLauncher.unlockScreenOrientation(false);
480
481        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
482        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
483
484        mOutlineProvider = null;
485        mDragInfo = null;
486        mDragSourceInternal = null;
487        mLauncher.onInteractionEnd();
488    }
489
490    /**
491     * Initializes various states for this workspace.
492     */
493    protected void initWorkspace() {
494        mCurrentPage = getDefaultPage();
495        LauncherAppState app = LauncherAppState.getInstance();
496        DeviceProfile grid = mLauncher.getDeviceProfile();
497        mIconCache = app.getIconCache();
498        setWillNotDraw(false);
499        setClipChildren(false);
500        setClipToPadding(false);
501
502        setMinScale(mOverviewModeShrinkFactor);
503        setupLayoutTransition();
504
505        mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
506
507        // Set the wallpaper dimensions when Launcher starts up
508        setWallpaperDimension();
509
510        setEdgeGlowColor(getResources().getColor(R.color.workspace_edge_effect_color));
511    }
512
513    @Override
514    public void initParentViews(View parent) {
515        super.initParentViews(parent);
516        mPageIndicator.setAccessibilityDelegate(new OverviewAccessibilityDelegate());
517        mQsbAlphaController = new MultiStateAlphaController(mLauncher.getQsbContainer(), 4);
518    }
519
520    private int getDefaultPage() {
521        return numCustomPages();
522    }
523
524    private void setupLayoutTransition() {
525        // We want to show layout transitions when pages are deleted, to close the gap.
526        mLayoutTransition = new LayoutTransition();
527        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
528        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
529        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
530        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
531        setLayoutTransition(mLayoutTransition);
532    }
533
534    void enableLayoutTransitions() {
535        setLayoutTransition(mLayoutTransition);
536    }
537    void disableLayoutTransitions() {
538        setLayoutTransition(null);
539    }
540
541    @Override
542    public void onChildViewAdded(View parent, View child) {
543        if (!(child instanceof CellLayout)) {
544            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
545        }
546        CellLayout cl = ((CellLayout) child);
547        cl.setOnInterceptTouchListener(this);
548        cl.setClickable(true);
549        cl.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
550        super.onChildViewAdded(parent, child);
551    }
552
553    boolean isTouchActive() {
554        return mTouchState != TOUCH_STATE_REST;
555    }
556
557    private int getEmbeddedQsbId() {
558        return mLauncher.getDeviceProfile().isVerticalBarLayout()
559                ? R.id.qsb_container : R.id.workspace_blocked_row;
560    }
561
562    /**
563     * Initializes and binds the first page
564     * @param qsb an existing qsb to recycle or null.
565     */
566    public void bindAndInitFirstWorkspaceScreen(View qsb) {
567        if (!FeatureFlags.QSB_ON_FIRST_SCREEN) {
568            return;
569        }
570        // Add the first page
571        CellLayout firstPage = insertNewWorkspaceScreen(Workspace.FIRST_SCREEN_ID, 0);
572        if (FeatureFlags.PULLDOWN_SEARCH) {
573            firstPage.setOnTouchListener(new VerticalFlingDetector(mLauncher) {
574                // detect fling when touch started from empty space
575                @Override
576                public boolean onTouch(View v, MotionEvent ev) {
577                    if (workspaceInModalState()) return false;
578                    if (shouldConsumeTouch(v)) return true;
579                    if (super.onTouch(v, ev)) {
580                        mLauncher.startSearch("", false, null, false);
581                        return true;
582                    }
583                    return false;
584                }
585            });
586            firstPage.setOnInterceptTouchListener(new VerticalFlingDetector(mLauncher) {
587                // detect fling when touch started from on top of the icons
588                @Override
589                public boolean onTouch(View v, MotionEvent ev) {
590                    if (shouldConsumeTouch(v)) return true;
591                    if (super.onTouch(v, ev)) {
592                        mLauncher.startSearch("", false, null, false);
593                        return true;
594                    }
595                    return false;
596                }
597            });
598        }
599        // Always add a QSB on the first screen.
600        if (qsb == null) {
601            // In transposed layout, we add the QSB in the Grid. As workspace does not touch the
602            // edges, we do not need a full width QSB.
603            qsb = mLauncher.getLayoutInflater().inflate(
604                    mLauncher.getDeviceProfile().isVerticalBarLayout()
605                            ? R.layout.qsb_container : R.layout.qsb_blocker_view,
606                    firstPage, false);
607        }
608
609        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, firstPage.getCountX(), 1);
610        lp.canReorder = false;
611        if (!firstPage.addViewToCellLayout(qsb, 0, getEmbeddedQsbId(), lp, true)) {
612            Log.e(TAG, "Failed to add to item at (0, 0) to CellLayout");
613        }
614    }
615
616    @Override
617    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
618        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
619
620        // Update the QSB to match the cell height. This is treating the QSB essentially as a child
621        // of workspace despite that it's not a true child.
622        // Note that it relies on the strict ordering of measuring the workspace before the QSB
623        // at the dragLayer level.
624        if (getChildCount() > 0) {
625            CellLayout firstPage = (CellLayout) getChildAt(0);
626            int cellHeight = firstPage.getCellHeight();
627
628            View qsbContainer = mLauncher.getQsbContainer();
629            ViewGroup.LayoutParams lp = qsbContainer.getLayoutParams();
630            if (cellHeight > 0 && lp.height != cellHeight) {
631                lp.height = cellHeight;
632                qsbContainer.setLayoutParams(lp);
633            }
634        }
635    }
636
637    public void removeAllWorkspaceScreens() {
638        // Disable all layout transitions before removing all pages to ensure that we don't get the
639        // transition animations competing with us changing the scroll when we add pages or the
640        // custom content screen
641        disableLayoutTransitions();
642
643        // Since we increment the current page when we call addCustomContentPage via bindScreens
644        // (and other places), we need to adjust the current page back when we clear the pages
645        if (hasCustomContent()) {
646            removeCustomContentPage();
647        }
648
649        // Recycle the QSB widget
650        View qsb = findViewById(getEmbeddedQsbId());
651        if (qsb != null) {
652            ((ViewGroup) qsb.getParent()).removeView(qsb);
653        }
654
655        // Remove the pages and clear the screen models
656        removeAllViews();
657        mScreenOrder.clear();
658        mWorkspaceScreens.clear();
659
660        // Ensure that the first page is always present
661        bindAndInitFirstWorkspaceScreen(qsb);
662
663        // Re-enable the layout transitions
664        enableLayoutTransitions();
665    }
666
667    public void insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {
668        // Find the index to insert this view into.  If the empty screen exists, then
669        // insert it before that.
670        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
671        if (insertIndex < 0) {
672            insertIndex = mScreenOrder.size();
673        }
674        insertNewWorkspaceScreen(screenId, insertIndex);
675    }
676
677    public void insertNewWorkspaceScreen(long screenId) {
678        insertNewWorkspaceScreen(screenId, getChildCount());
679    }
680
681    public CellLayout insertNewWorkspaceScreen(long screenId, int insertIndex) {
682        if (mWorkspaceScreens.containsKey(screenId)) {
683            throw new RuntimeException("Screen id " + screenId + " already exists!");
684        }
685
686        // Inflate the cell layout, but do not add it automatically so that we can get the newly
687        // created CellLayout.
688        CellLayout newScreen = (CellLayout) mLauncher.getLayoutInflater().inflate(
689                        R.layout.workspace_screen, this, false /* attachToRoot */);
690        newScreen.setOnLongClickListener(mLongClickListener);
691        newScreen.setOnClickListener(mLauncher);
692        newScreen.setSoundEffectsEnabled(false);
693        mWorkspaceScreens.put(screenId, newScreen);
694        mScreenOrder.add(insertIndex, screenId);
695        addView(newScreen, insertIndex);
696
697        if (mLauncher.getAccessibilityDelegate().isInAccessibleDrag()) {
698            newScreen.enableAccessibleDrag(true, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
699        }
700
701        return newScreen;
702    }
703
704    public void createCustomContentContainer() {
705        CellLayout customScreen = (CellLayout)
706                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false);
707        customScreen.disableDragTarget();
708        customScreen.disableJailContent();
709
710        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
711        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
712
713        // We want no padding on the custom content
714        customScreen.setPadding(0, 0, 0, 0);
715
716        addFullScreenPage(customScreen);
717
718        // Update the custom content hint
719        setCurrentPage(getCurrentPage() + 1);
720    }
721
722    public void removeCustomContentPage() {
723        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
724        if (customScreen == null) {
725            throw new RuntimeException("Expected custom content screen to exist");
726        }
727
728        mWorkspaceScreens.remove(CUSTOM_CONTENT_SCREEN_ID);
729        mScreenOrder.remove(CUSTOM_CONTENT_SCREEN_ID);
730        removeView(customScreen);
731
732        if (mCustomContentCallbacks != null) {
733            mCustomContentCallbacks.onScrollProgressChanged(0);
734            mCustomContentCallbacks.onHide();
735        }
736
737        mCustomContentCallbacks = null;
738
739        // Update the custom content hint
740        setCurrentPage(getCurrentPage() - 1);
741    }
742
743    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks,
744            String description) {
745        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
746            throw new RuntimeException("Expected custom content screen to exist");
747        }
748
749        // Add the custom content to the full screen custom page
750        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
751        int spanX = customScreen.getCountX();
752        int spanY = customScreen.getCountY();
753        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
754        lp.canReorder  = false;
755        lp.isFullscreen = true;
756        if (customContent instanceof Insettable) {
757            ((Insettable)customContent).setInsets(mInsets);
758        }
759
760        // Verify that the child is removed from any existing parent.
761        if (customContent.getParent() instanceof ViewGroup) {
762            ViewGroup parent = (ViewGroup) customContent.getParent();
763            parent.removeView(customContent);
764        }
765        customScreen.removeAllViews();
766        customContent.setFocusable(true);
767        customContent.setOnKeyListener(new FullscreenKeyEventListener());
768        customContent.setOnFocusChangeListener(mLauncher.mFocusHandler
769                .getHideIndicatorOnFocusListener());
770        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
771        mCustomContentDescription = description;
772
773        mCustomContentCallbacks = callbacks;
774    }
775
776    public void addExtraEmptyScreenOnDrag() {
777        boolean lastChildOnScreen = false;
778        boolean childOnFinalScreen = false;
779
780        // Cancel any pending removal of empty screen
781        mRemoveEmptyScreenRunnable = null;
782
783        if (mDragSourceInternal != null) {
784            if (mDragSourceInternal.getChildCount() == 1) {
785                lastChildOnScreen = true;
786            }
787            CellLayout cl = (CellLayout) mDragSourceInternal.getParent();
788            if (indexOfChild(cl) == getChildCount() - 1) {
789                childOnFinalScreen = true;
790            }
791        }
792
793        // If this is the last item on the final screen
794        if (lastChildOnScreen && childOnFinalScreen) {
795            return;
796        }
797        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
798            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
799        }
800    }
801
802    public boolean addExtraEmptyScreen() {
803        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
804            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
805            return true;
806        }
807        return false;
808    }
809
810    private void convertFinalScreenToEmptyScreenIfNecessary() {
811        if (mLauncher.isWorkspaceLoading()) {
812            // Invalid and dangerous operation if workspace is loading
813            return;
814        }
815
816        if (hasExtraEmptyScreen() || mScreenOrder.size() == 0) return;
817        long finalScreenId = mScreenOrder.get(mScreenOrder.size() - 1);
818
819        if (finalScreenId == CUSTOM_CONTENT_SCREEN_ID) return;
820        CellLayout finalScreen = mWorkspaceScreens.get(finalScreenId);
821
822        // If the final screen is empty, convert it to the extra empty screen
823        if (finalScreen.getShortcutsAndWidgets().getChildCount() == 0 &&
824                !finalScreen.isDropPending()) {
825            mWorkspaceScreens.remove(finalScreenId);
826            mScreenOrder.remove(finalScreenId);
827
828            // if this is the last non-custom content screen, convert it to the empty screen
829            mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, finalScreen);
830            mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
831
832            // Update the model if we have changed any screens
833            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
834        }
835    }
836
837    public void removeExtraEmptyScreen(final boolean animate, boolean stripEmptyScreens) {
838        removeExtraEmptyScreenDelayed(animate, null, 0, stripEmptyScreens);
839    }
840
841    public void removeExtraEmptyScreenDelayed(final boolean animate, final Runnable onComplete,
842            final int delay, final boolean stripEmptyScreens) {
843        if (mLauncher.isWorkspaceLoading()) {
844            // Don't strip empty screens if the workspace is still loading
845            return;
846        }
847
848        if (delay > 0) {
849            postDelayed(new Runnable() {
850                @Override
851                public void run() {
852                    removeExtraEmptyScreenDelayed(animate, onComplete, 0, stripEmptyScreens);
853                }
854            }, delay);
855            return;
856        }
857
858        convertFinalScreenToEmptyScreenIfNecessary();
859        if (hasExtraEmptyScreen()) {
860            int emptyIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
861            if (getNextPage() == emptyIndex) {
862                snapToPage(getNextPage() - 1, SNAP_OFF_EMPTY_SCREEN_DURATION);
863                fadeAndRemoveEmptyScreen(SNAP_OFF_EMPTY_SCREEN_DURATION, FADE_EMPTY_SCREEN_DURATION,
864                        onComplete, stripEmptyScreens);
865            } else {
866                snapToPage(getNextPage(), 0);
867                fadeAndRemoveEmptyScreen(0, FADE_EMPTY_SCREEN_DURATION,
868                        onComplete, stripEmptyScreens);
869            }
870            return;
871        } else if (stripEmptyScreens) {
872            // If we're not going to strip the empty screens after removing
873            // the extra empty screen, do it right away.
874            stripEmptyScreens();
875        }
876
877        if (onComplete != null) {
878            onComplete.run();
879        }
880    }
881
882    private void fadeAndRemoveEmptyScreen(int delay, int duration, final Runnable onComplete,
883            final boolean stripEmptyScreens) {
884        // XXX: Do we need to update LM workspace screens below?
885        PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha", 0f);
886        PropertyValuesHolder bgAlpha = PropertyValuesHolder.ofFloat("backgroundAlpha", 0f);
887
888        final CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
889
890        mRemoveEmptyScreenRunnable = new Runnable() {
891            @Override
892            public void run() {
893                if (hasExtraEmptyScreen()) {
894                    mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
895                    mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
896                    removeView(cl);
897                    if (stripEmptyScreens) {
898                        stripEmptyScreens();
899                    }
900                    // Update the page indicator to reflect the removed page.
901                    showPageIndicatorAtCurrentScroll();
902                }
903            }
904        };
905
906        ObjectAnimator oa = ObjectAnimator.ofPropertyValuesHolder(cl, alpha, bgAlpha);
907        oa.setDuration(duration);
908        oa.setStartDelay(delay);
909        oa.addListener(new AnimatorListenerAdapter() {
910            @Override
911            public void onAnimationEnd(Animator animation) {
912                if (mRemoveEmptyScreenRunnable != null) {
913                    mRemoveEmptyScreenRunnable.run();
914                }
915                if (onComplete != null) {
916                    onComplete.run();
917                }
918            }
919        });
920        oa.start();
921    }
922
923    public boolean hasExtraEmptyScreen() {
924        int nScreens = getChildCount();
925        nScreens = nScreens - numCustomPages();
926        return mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID) && nScreens > 1;
927    }
928
929    public long commitExtraEmptyScreen() {
930        if (mLauncher.isWorkspaceLoading()) {
931            // Invalid and dangerous operation if workspace is loading
932            return -1;
933        }
934
935        int index = getPageIndexForScreenId(EXTRA_EMPTY_SCREEN_ID);
936        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
937        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
938        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
939
940        long newId = LauncherSettings.Settings.call(getContext().getContentResolver(),
941                LauncherSettings.Settings.METHOD_NEW_SCREEN_ID)
942                .getLong(LauncherSettings.Settings.EXTRA_VALUE);
943        mWorkspaceScreens.put(newId, cl);
944        mScreenOrder.add(newId);
945
946        // Update the model for the new screen
947        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
948
949        return newId;
950    }
951
952    public CellLayout getScreenWithId(long screenId) {
953        return mWorkspaceScreens.get(screenId);
954    }
955
956    public long getIdForScreen(CellLayout layout) {
957        int index = mWorkspaceScreens.indexOfValue(layout);
958        if (index != -1) {
959            return mWorkspaceScreens.keyAt(index);
960        }
961        return -1;
962    }
963
964    public int getPageIndexForScreenId(long screenId) {
965        return indexOfChild(mWorkspaceScreens.get(screenId));
966    }
967
968    public long getScreenIdForPageIndex(int index) {
969        if (0 <= index && index < mScreenOrder.size()) {
970            return mScreenOrder.get(index);
971        }
972        return -1;
973    }
974
975    public ArrayList<Long> getScreenOrder() {
976        return mScreenOrder;
977    }
978
979    public void stripEmptyScreens() {
980        if (mLauncher.isWorkspaceLoading()) {
981            // Don't strip empty screens if the workspace is still loading.
982            // This is dangerous and can result in data loss.
983            return;
984        }
985
986        if (isPageInTransition()) {
987            mStripScreensOnPageStopMoving = true;
988            return;
989        }
990
991        int currentPage = getNextPage();
992        ArrayList<Long> removeScreens = new ArrayList<Long>();
993        int total = mWorkspaceScreens.size();
994        for (int i = 0; i < total; i++) {
995            long id = mWorkspaceScreens.keyAt(i);
996            CellLayout cl = mWorkspaceScreens.valueAt(i);
997            // FIRST_SCREEN_ID can never be removed.
998            if ((!FeatureFlags.QSB_ON_FIRST_SCREEN || id > FIRST_SCREEN_ID)
999                    && cl.getShortcutsAndWidgets().getChildCount() == 0) {
1000                removeScreens.add(id);
1001            }
1002        }
1003
1004        boolean isInAccessibleDrag = mLauncher.getAccessibilityDelegate().isInAccessibleDrag();
1005
1006        // We enforce at least one page to add new items to. In the case that we remove the last
1007        // such screen, we convert the last screen to the empty screen
1008        int minScreens = 1 + numCustomPages();
1009
1010        int pageShift = 0;
1011        for (Long id: removeScreens) {
1012            CellLayout cl = mWorkspaceScreens.get(id);
1013            mWorkspaceScreens.remove(id);
1014            mScreenOrder.remove(id);
1015
1016            if (getChildCount() > minScreens) {
1017                if (indexOfChild(cl) < currentPage) {
1018                    pageShift++;
1019                }
1020
1021                if (isInAccessibleDrag) {
1022                    cl.enableAccessibleDrag(false, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
1023                }
1024
1025                removeView(cl);
1026            } else {
1027                // if this is the last non-custom content screen, convert it to the empty screen
1028                mRemoveEmptyScreenRunnable = null;
1029                mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, cl);
1030                mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
1031            }
1032        }
1033
1034        if (!removeScreens.isEmpty()) {
1035            // Update the model if we have changed any screens
1036            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1037        }
1038
1039        if (pageShift >= 0) {
1040            setCurrentPage(currentPage - pageShift);
1041        }
1042    }
1043
1044    // See implementation for parameter definition.
1045    void addInScreen(View child, long container, long screenId,
1046            int x, int y, int spanX, int spanY) {
1047        addInScreen(child, container, screenId, x, y, spanX, spanY, false, false);
1048    }
1049
1050    // At bind time, we use the rank (screenId) to compute x and y for hotseat items.
1051    // See implementation for parameter definition.
1052    public void addInScreenFromBind(View child, long container, long screenId, int x, int y,
1053            int spanX, int spanY) {
1054        addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);
1055    }
1056
1057    // See implementation for parameter definition.
1058    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
1059            boolean insert) {
1060        addInScreen(child, container, screenId, x, y, spanX, spanY, insert, false);
1061    }
1062
1063    /**
1064     * Adds the specified child in the specified screen. The position and dimension of
1065     * the child are defined by x, y, spanX and spanY.
1066     *
1067     * @param child The child to add in one of the workspace's screens.
1068     * @param screenId The screen in which to add the child.
1069     * @param x The X position of the child in the screen's grid.
1070     * @param y The Y position of the child in the screen's grid.
1071     * @param spanX The number of cells spanned horizontally by the child.
1072     * @param spanY The number of cells spanned vertically by the child.
1073     * @param insert When true, the child is inserted at the beginning of the children list.
1074     * @param computeXYFromRank When true, we use the rank (stored in screenId) to compute
1075     *                          the x and y position in which to place hotseat items. Otherwise
1076     *                          we use the x and y position to compute the rank.
1077     */
1078    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
1079            boolean insert, boolean computeXYFromRank) {
1080        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
1081            if (getScreenWithId(screenId) == null) {
1082                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
1083                // DEBUGGING - Print out the stack trace to see where we are adding from
1084                new Throwable().printStackTrace();
1085                return;
1086            }
1087        }
1088        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
1089            // This should never happen
1090            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
1091        }
1092
1093        final CellLayout layout;
1094        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
1095            layout = mLauncher.getHotseat().getLayout();
1096            child.setOnKeyListener(new HotseatIconKeyEventListener());
1097
1098            // Hide folder title in the hotseat
1099            if (child instanceof FolderIcon) {
1100                ((FolderIcon) child).setTextVisible(false);
1101            }
1102
1103            if (computeXYFromRank) {
1104                x = mLauncher.getHotseat().getCellXFromOrder((int) screenId);
1105                y = mLauncher.getHotseat().getCellYFromOrder((int) screenId);
1106            } else {
1107                screenId = mLauncher.getHotseat().getOrderInHotseat(x, y);
1108            }
1109        } else {
1110            // Show folder title if not in the hotseat
1111            if (child instanceof FolderIcon) {
1112                ((FolderIcon) child).setTextVisible(true);
1113            }
1114            layout = getScreenWithId(screenId);
1115            child.setOnKeyListener(new IconKeyEventListener());
1116        }
1117
1118        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
1119        CellLayout.LayoutParams lp;
1120        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
1121            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
1122        } else {
1123            lp = (CellLayout.LayoutParams) genericLp;
1124            lp.cellX = x;
1125            lp.cellY = y;
1126            lp.cellHSpan = spanX;
1127            lp.cellVSpan = spanY;
1128        }
1129
1130        if (spanX < 0 && spanY < 0) {
1131            lp.isLockedToGrid = false;
1132        }
1133
1134        // Get the canonical child id to uniquely represent this view in this screen
1135        ItemInfo info = (ItemInfo) child.getTag();
1136        int childId = mLauncher.getViewIdForItem(info);
1137
1138        boolean markCellsAsOccupied = !(child instanceof Folder);
1139        if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) {
1140            // TODO: This branch occurs when the workspace is adding views
1141            // outside of the defined grid
1142            // maybe we should be deleting these items from the LauncherModel?
1143            Log.e(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout");
1144        }
1145
1146        if (!(child instanceof Folder)) {
1147            child.setHapticFeedbackEnabled(false);
1148            child.setOnLongClickListener(mLongClickListener);
1149        }
1150        if (child instanceof DropTarget) {
1151            mDragController.addDropTarget((DropTarget) child);
1152        }
1153    }
1154
1155    /**
1156     * Called directly from a CellLayout (not by the framework), after we've been added as a
1157     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
1158     * that it should intercept touch events, which is not something that is normally supported.
1159     */
1160    @SuppressLint("ClickableViewAccessibility")
1161    @Override
1162    public boolean onTouch(View v, MotionEvent event) {
1163        return shouldConsumeTouch(v);
1164    }
1165
1166    private boolean shouldConsumeTouch(View v) {
1167        return (workspaceInModalState() || !isFinishedSwitchingState())
1168                || (!workspaceInModalState() && indexOfChild(v) != mCurrentPage);
1169    }
1170
1171    public boolean isSwitchingState() {
1172        return mIsSwitchingState;
1173    }
1174
1175    /** This differs from isSwitchingState in that we take into account how far the transition
1176     *  has completed. */
1177    public boolean isFinishedSwitchingState() {
1178        return !mIsSwitchingState || (mTransitionProgress > 0.5f);
1179    }
1180
1181    protected void onWindowVisibilityChanged (int visibility) {
1182        mLauncher.onWindowVisibilityChanged(visibility);
1183    }
1184
1185    @Override
1186    public boolean dispatchUnhandledMove(View focused, int direction) {
1187        if (workspaceInModalState() || !isFinishedSwitchingState()) {
1188            // when the home screens are shrunken, shouldn't allow side-scrolling
1189            return false;
1190        }
1191        return super.dispatchUnhandledMove(focused, direction);
1192    }
1193
1194    @Override
1195    public boolean onInterceptTouchEvent(MotionEvent ev) {
1196        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
1197        case MotionEvent.ACTION_DOWN:
1198            mXDown = ev.getX();
1199            mYDown = ev.getY();
1200            mTouchDownTime = System.currentTimeMillis();
1201            break;
1202        case MotionEvent.ACTION_POINTER_UP:
1203        case MotionEvent.ACTION_UP:
1204            if (mTouchState == TOUCH_STATE_REST) {
1205                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
1206                if (currentPage != null) {
1207                    onWallpaperTap(ev);
1208                }
1209            }
1210        }
1211        return super.onInterceptTouchEvent(ev);
1212    }
1213
1214    @Override
1215    public boolean onGenericMotionEvent(MotionEvent event) {
1216        // Ignore pointer scroll events if the custom content doesn't allow scrolling.
1217        if ((getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID)
1218                && (mCustomContentCallbacks != null)
1219                && !mCustomContentCallbacks.isScrollingAllowed()) {
1220            return false;
1221        }
1222        return super.onGenericMotionEvent(event);
1223    }
1224
1225    protected void reinflateWidgetsIfNecessary() {
1226        final int clCount = getChildCount();
1227        for (int i = 0; i < clCount; i++) {
1228            CellLayout cl = (CellLayout) getChildAt(i);
1229            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
1230            final int itemCount = swc.getChildCount();
1231            for (int j = 0; j < itemCount; j++) {
1232                View v = swc.getChildAt(j);
1233
1234                if (v instanceof LauncherAppWidgetHostView
1235                        && v.getTag() instanceof LauncherAppWidgetInfo) {
1236                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
1237                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) v;
1238                    if (lahv.isReinflateRequired()) {
1239                        // Remove and rebind the current widget (which was inflated in the wrong
1240                        // orientation), but don't delete it from the database
1241                        mLauncher.removeItem(lahv, info, false  /* deleteFromDb */);
1242                        mLauncher.bindAppWidget(info);
1243                    }
1244                }
1245            }
1246        }
1247    }
1248
1249    @Override
1250    protected void determineScrollingStart(MotionEvent ev) {
1251        if (!isFinishedSwitchingState()) return;
1252
1253        float deltaX = ev.getX() - mXDown;
1254        float absDeltaX = Math.abs(deltaX);
1255        float absDeltaY = Math.abs(ev.getY() - mYDown);
1256
1257        if (Float.compare(absDeltaX, 0f) == 0) return;
1258
1259        float slope = absDeltaY / absDeltaX;
1260        float theta = (float) Math.atan(slope);
1261
1262        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
1263            cancelCurrentPageLongPress();
1264        }
1265
1266        boolean passRightSwipesToCustomContent =
1267                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
1268
1269        boolean swipeInIgnoreDirection = mIsRtl ? deltaX < 0 : deltaX > 0;
1270        boolean onCustomContentScreen =
1271                getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID;
1272        if (swipeInIgnoreDirection && onCustomContentScreen && passRightSwipesToCustomContent) {
1273            // Pass swipes to the right to the custom content page.
1274            return;
1275        }
1276
1277        if (onCustomContentScreen && (mCustomContentCallbacks != null)
1278                && !mCustomContentCallbacks.isScrollingAllowed()) {
1279            // Don't allow workspace scrolling if the current custom content screen doesn't allow
1280            // scrolling.
1281            return;
1282        }
1283
1284        if (theta > MAX_SWIPE_ANGLE) {
1285            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
1286            return;
1287        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
1288            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
1289            // increase the touch slop to make it harder to begin scrolling the workspace. This
1290            // results in vertically scrolling widgets to more easily. The higher the angle, the
1291            // more we increase touch slop.
1292            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
1293            float extraRatio = (float)
1294                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
1295            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
1296        } else {
1297            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
1298            super.determineScrollingStart(ev);
1299        }
1300    }
1301
1302    protected void onPageBeginTransition() {
1303        super.onPageBeginTransition();
1304        updateChildrenLayersEnabled(false);
1305    }
1306
1307    protected void onPageEndTransition() {
1308        super.onPageEndTransition();
1309        updateChildrenLayersEnabled(false);
1310
1311        if (mDragController.isDragging()) {
1312            if (workspaceInModalState()) {
1313                // If we are in springloaded mode, then force an event to check if the current touch
1314                // is under a new page (to scroll to)
1315                mDragController.forceTouchMove();
1316            }
1317        }
1318
1319        if (mDelayedResizeRunnable != null && !mIsSwitchingState) {
1320            mDelayedResizeRunnable.run();
1321            mDelayedResizeRunnable = null;
1322        }
1323
1324        if (mDelayedSnapToPageRunnable != null) {
1325            mDelayedSnapToPageRunnable.run();
1326            mDelayedSnapToPageRunnable = null;
1327        }
1328        if (mStripScreensOnPageStopMoving) {
1329            stripEmptyScreens();
1330            mStripScreensOnPageStopMoving = false;
1331        }
1332    }
1333
1334    protected void onScrollInteractionBegin() {
1335        super.onScrollInteractionEnd();
1336        mScrollInteractionBegan = true;
1337    }
1338
1339    protected void onScrollInteractionEnd() {
1340        super.onScrollInteractionEnd();
1341        mScrollInteractionBegan = false;
1342        if (mStartedSendingScrollEvents) {
1343            mStartedSendingScrollEvents = false;
1344            mLauncherOverlay.onScrollInteractionEnd();
1345        }
1346    }
1347
1348    public void setLauncherOverlay(LauncherOverlay overlay) {
1349        mLauncherOverlay = overlay;
1350        // A new overlay has been set. Reset event tracking
1351        mStartedSendingScrollEvents = false;
1352        onOverlayScrollChanged(0);
1353    }
1354
1355    @Override
1356    protected int getUnboundedScrollX() {
1357        if (isScrollingOverlay()) {
1358            return mUnboundedScrollX;
1359        }
1360
1361        return super.getUnboundedScrollX();
1362    }
1363
1364    private boolean isScrollingOverlay() {
1365        return mLauncherOverlay != null &&
1366                ((mIsRtl && mUnboundedScrollX > mMaxScrollX) || (!mIsRtl && mUnboundedScrollX < 0));
1367    }
1368
1369    @Override
1370    protected void snapToDestination() {
1371        // If we're overscrolling the overlay, we make sure to immediately reset the PagedView
1372        // to it's baseline position instead of letting the overscroll settle. The overlay handles
1373        // it's own settling, and every gesture to the overlay should be self-contained and start
1374        // from 0, so we zero it out here.
1375        if (isScrollingOverlay()) {
1376            int finalScroll = mIsRtl ? mMaxScrollX : 0;
1377
1378            // We reset mWasInOverscroll so that PagedView doesn't zero out the overscroll
1379            // interaction when we call scrollTo.
1380            mWasInOverscroll = false;
1381            scrollTo(finalScroll, getScrollY());
1382        } else {
1383            super.snapToDestination();
1384        }
1385    }
1386
1387    @Override
1388    public void scrollTo(int x, int y) {
1389        mUnboundedScrollX = x;
1390        super.scrollTo(x, y);
1391    }
1392
1393    private void onWorkspaceOverallScrollChanged() {
1394        if (!mIgnoreQsbScroll) {
1395            mLauncher.getQsbContainer().setTranslationX(
1396                    mOverlayTranslation + mFirstPageScrollX - getScrollX());
1397        }
1398    }
1399
1400    @Override
1401    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
1402        super.onScrollChanged(l, t, oldl, oldt);
1403        onWorkspaceOverallScrollChanged();
1404
1405        // Update the page indicator progress.
1406        boolean isTransitioning = mIsSwitchingState
1407                || (getLayoutTransition() != null && getLayoutTransition().isRunning());
1408        if (!isTransitioning) {
1409            showPageIndicatorAtCurrentScroll();
1410        }
1411
1412        updatePageAlphaValues();
1413        updateStateForCustomContent();
1414        enableHwLayersOnVisiblePages();
1415    }
1416
1417    private void showPageIndicatorAtCurrentScroll() {
1418        if (mPageIndicator != null) {
1419            mPageIndicator.setScroll(getScrollX(), computeMaxScrollX());
1420        }
1421    }
1422
1423    @Override
1424    protected void overScroll(float amount) {
1425        boolean shouldOverScroll = (amount <= 0 && (!hasCustomContent() || mIsRtl)) ||
1426                (amount >= 0 && (!hasCustomContent() || !mIsRtl));
1427
1428        boolean shouldScrollOverlay = mLauncherOverlay != null &&
1429                ((amount <= 0 && !mIsRtl) || (amount >= 0 && mIsRtl));
1430
1431        boolean shouldZeroOverlay = mLauncherOverlay != null && mLastOverlayScroll != 0 &&
1432                ((amount >= 0 && !mIsRtl) || (amount <= 0 && mIsRtl));
1433
1434        if (shouldScrollOverlay) {
1435            if (!mStartedSendingScrollEvents && mScrollInteractionBegan) {
1436                mStartedSendingScrollEvents = true;
1437                mLauncherOverlay.onScrollInteractionBegin();
1438            }
1439
1440            mLastOverlayScroll = Math.abs(amount / getViewportWidth());
1441            mLauncherOverlay.onScrollChange(mLastOverlayScroll, mIsRtl);
1442        } else if (shouldOverScroll) {
1443            dampedOverScroll(amount);
1444        }
1445
1446        if (shouldZeroOverlay) {
1447            mLauncherOverlay.onScrollChange(0, mIsRtl);
1448        }
1449    }
1450
1451    private final Interpolator mAlphaInterpolator = new DecelerateInterpolator(3f);
1452
1453    /**
1454     * The overlay scroll is being controlled locally, just update our overlay effect
1455     */
1456    public void onOverlayScrollChanged(float scroll) {
1457        float offset = 0f;
1458        float slip = 0f;
1459
1460        scroll = Math.max(scroll - offset, 0);
1461        scroll = Math.min(1, scroll / (1 - offset));
1462
1463        float alpha = 1 - mAlphaInterpolator.getInterpolation(scroll);
1464        float transX = mLauncher.getDragLayer().getMeasuredWidth() * scroll;
1465        transX *= 1 - slip;
1466
1467        if (mIsRtl) {
1468            transX = -transX;
1469        }
1470        mOverlayTranslation = transX;
1471
1472        // TODO(adamcohen): figure out a final effect here. We may need to recommend
1473        // different effects based on device performance. On at least one relatively high-end
1474        // device I've tried, translating the launcher causes things to get quite laggy.
1475        setWorkspaceTranslationAndAlpha(Direction.X, transX, alpha);
1476        setHotseatTranslationAndAlpha(Direction.X, transX, alpha);
1477        onWorkspaceOverallScrollChanged();
1478
1479        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_OVERLAY_SCROLL);
1480    }
1481
1482    /**
1483     * Moves the workspace UI in the Y direction.
1484     * @param translation the amount of shift.
1485     * @param alpha the alpha for the workspace page
1486     */
1487    public void setWorkspaceYTranslationAndAlpha(float translation, float alpha) {
1488        setWorkspaceTranslationAndAlpha(Direction.Y, translation, alpha);
1489
1490        mLauncher.getQsbContainer().setTranslationY(translation);
1491        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_Y_TRANSLATION);
1492    }
1493
1494    /**
1495     * Moves the workspace UI in the provided direction.
1496     * @param direction the direction to move the workspace
1497     * @param translation the amount of shift.
1498     * @param alpha the alpha for the workspace page
1499     */
1500    private void setWorkspaceTranslationAndAlpha(Direction direction, float translation, float alpha) {
1501        Property<View, Float> property = direction.viewProperty;
1502        mPageAlpha[direction.ordinal()] = alpha;
1503        float finalAlpha = mPageAlpha[0] * mPageAlpha[1];
1504
1505        View currentChild = getChildAt(getCurrentPage());
1506        if (currentChild != null) {
1507            property.set(currentChild, translation);
1508            currentChild.setAlpha(finalAlpha);
1509        }
1510
1511        // When the animation finishes, reset all pages, just in case we missed a page.
1512        if (Float.compare(translation, 0) == 0) {
1513            for (int i = getChildCount() - 1; i >= 0; i--) {
1514                View child = getChildAt(i);
1515                property.set(child, translation);
1516                child.setAlpha(finalAlpha);
1517            }
1518        }
1519    }
1520
1521    /**
1522     * Moves the Hotseat UI in the provided direction.
1523     * @param direction the direction to move the workspace
1524     * @param translation the amount of shift.
1525     * @param alpha the alpha for the hotseat page
1526     */
1527    public void setHotseatTranslationAndAlpha(Direction direction, float translation, float alpha) {
1528        Property<View, Float> property = direction.viewProperty;
1529        // Skip the page indicator movement in the vertical bar layout
1530        if (direction != Direction.Y || !mLauncher.getDeviceProfile().isVerticalBarLayout()) {
1531            property.set(mPageIndicator, translation);
1532        }
1533        property.set(mLauncher.getHotseat(), translation);
1534        setHotseatAlphaAtIndex(alpha, direction.ordinal());
1535    }
1536
1537    private void setHotseatAlphaAtIndex(float alpha, int index) {
1538        mHotseatAlpha[index] = alpha;
1539        final float hotseatAlpha = mHotseatAlpha[0] * mHotseatAlpha[1] * mHotseatAlpha[2];
1540        final float pageIndicatorAlpha = mHotseatAlpha[0] * mHotseatAlpha[2];
1541
1542        mLauncher.getHotseat().setAlpha(hotseatAlpha);
1543        mPageIndicator.setAlpha(pageIndicatorAlpha);
1544    }
1545
1546    public ValueAnimator createHotseatAlphaAnimator(float finalValue) {
1547        if (Float.compare(finalValue, mHotseatAlpha[HOTSEAT_STATE_ALPHA_INDEX]) == 0) {
1548            // Return a dummy animator to avoid null checks.
1549            return ValueAnimator.ofFloat(0, 0);
1550        } else {
1551            ValueAnimator animator = ValueAnimator
1552                    .ofFloat(mHotseatAlpha[HOTSEAT_STATE_ALPHA_INDEX], finalValue);
1553            animator.addUpdateListener(new AnimatorUpdateListener() {
1554                @Override
1555                public void onAnimationUpdate(ValueAnimator valueAnimator) {
1556                    float value = (Float) valueAnimator.getAnimatedValue();
1557                    setHotseatAlphaAtIndex(value, HOTSEAT_STATE_ALPHA_INDEX);
1558                }
1559            });
1560
1561            AccessibilityManager am = (AccessibilityManager)
1562                    mLauncher.getSystemService(Context.ACCESSIBILITY_SERVICE);
1563            final boolean accessibilityEnabled = am.isEnabled();
1564            animator.addUpdateListener(
1565                    new AlphaUpdateListener(mLauncher.getHotseat(), accessibilityEnabled));
1566            animator.addUpdateListener(
1567                    new AlphaUpdateListener(mPageIndicator, accessibilityEnabled));
1568            return animator;
1569        }
1570    }
1571
1572    @Override
1573    protected void getEdgeVerticalPosition(int[] pos) {
1574        View child = getChildAt(getPageCount() - 1);
1575        pos[0] = child.getTop();
1576        pos[1] = child.getBottom();
1577    }
1578
1579    @Override
1580    protected void notifyPageSwitchListener() {
1581        super.notifyPageSwitchListener();
1582
1583        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
1584            mCustomContentShowing = true;
1585            if (mCustomContentCallbacks != null) {
1586                mCustomContentCallbacks.onShow(false);
1587                mCustomContentShowTime = System.currentTimeMillis();
1588            }
1589        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
1590            mCustomContentShowing = false;
1591            if (mCustomContentCallbacks != null) {
1592                mCustomContentCallbacks.onHide();
1593            }
1594        }
1595    }
1596
1597    protected CustomContentCallbacks getCustomContentCallbacks() {
1598        return mCustomContentCallbacks;
1599    }
1600
1601    protected void setWallpaperDimension() {
1602        Utilities.THREAD_POOL_EXECUTOR.execute(new Runnable() {
1603            @Override
1604            public void run() {
1605                final Point size = LauncherAppState.getInstance()
1606                        .getInvariantDeviceProfile().defaultWallpaperSize;
1607                if (size.x != mWallpaperManager.getDesiredMinimumWidth()
1608                        || size.y != mWallpaperManager.getDesiredMinimumHeight()) {
1609                    mWallpaperManager.suggestDesiredDimensions(size.x, size.y);
1610                }
1611            }
1612        });
1613    }
1614
1615    public void lockWallpaperToDefaultPage() {
1616        mWallpaperOffset.setLockToDefaultPage(true);
1617    }
1618
1619    public void unlockWallpaperFromDefaultPageOnNextLayout() {
1620        if (mWallpaperOffset.isLockedToDefaultPage()) {
1621            mUnlockWallpaperFromDefaultPageOnLayout = true;
1622            requestLayout();
1623        }
1624    }
1625
1626    protected void snapToPage(int whichPage, Runnable r) {
1627        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION, r);
1628    }
1629
1630    protected void snapToPage(int whichPage, int duration, Runnable r) {
1631        if (mDelayedSnapToPageRunnable != null) {
1632            mDelayedSnapToPageRunnable.run();
1633        }
1634        mDelayedSnapToPageRunnable = r;
1635        snapToPage(whichPage, duration);
1636    }
1637
1638    public void snapToScreenId(long screenId) {
1639        snapToScreenId(screenId, null);
1640    }
1641
1642    protected void snapToScreenId(long screenId, Runnable r) {
1643        snapToPage(getPageIndexForScreenId(screenId), r);
1644    }
1645
1646    @Override
1647    public void computeScroll() {
1648        super.computeScroll();
1649        mWallpaperOffset.syncWithScroll();
1650    }
1651
1652    public void computeScrollWithoutInvalidation() {
1653        computeScrollHelper(false);
1654    }
1655
1656    @Override
1657    protected void determineScrollingStart(MotionEvent ev, float touchSlopScale) {
1658        if (!isSwitchingState()) {
1659            super.determineScrollingStart(ev, touchSlopScale);
1660        }
1661    }
1662
1663    @Override
1664    public void announceForAccessibility(CharSequence text) {
1665        // Don't announce if apps is on top of us.
1666        if (!mLauncher.isAppsViewVisible()) {
1667            super.announceForAccessibility(text);
1668        }
1669    }
1670
1671    public void showOutlinesTemporarily() {
1672        if (!mIsPageInTransition && !isTouchActive()) {
1673            snapToPage(mCurrentPage);
1674        }
1675    }
1676
1677    private void updatePageAlphaValues() {
1678        if (mWorkspaceFadeInAdjacentScreens &&
1679                !workspaceInModalState() &&
1680                !mIsSwitchingState) {
1681            int screenCenter = getScrollX() + getViewportOffsetX() + getViewportWidth() / 2;
1682            for (int i = numCustomPages(); i < getChildCount(); i++) {
1683                CellLayout child = (CellLayout) getChildAt(i);
1684                if (child != null) {
1685                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1686                    float alpha = 1 - Math.abs(scrollProgress);
1687                    child.getShortcutsAndWidgets().setAlpha(alpha);
1688
1689                    if (isQsbContainerPage(i)) {
1690                        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_PAGE_SCROLL);
1691                    }
1692                }
1693            }
1694        }
1695    }
1696
1697    public boolean hasCustomContent() {
1698        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1699    }
1700
1701    public int numCustomPages() {
1702        return hasCustomContent() ? 1 : 0;
1703    }
1704
1705    public boolean isOnOrMovingToCustomContent() {
1706        return hasCustomContent() && getNextPage() == 0;
1707    }
1708
1709    private void updateStateForCustomContent() {
1710        float translationX = 0;
1711        float progress = 0;
1712        if (hasCustomContent()) {
1713            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1714
1715            int scrollDelta = getScrollX() - getScrollForPage(index) -
1716                    getLayoutTransitionOffsetForPage(index);
1717            float scrollRange = getScrollForPage(index + 1) - getScrollForPage(index);
1718            translationX = scrollRange - scrollDelta;
1719            progress = (scrollRange - scrollDelta) / scrollRange;
1720
1721            if (mIsRtl) {
1722                translationX = Math.min(0, translationX);
1723            } else {
1724                translationX = Math.max(0, translationX);
1725            }
1726            progress = Math.max(0, progress);
1727        }
1728
1729        if (Float.compare(progress, mLastCustomContentScrollProgress) == 0) return;
1730
1731        CellLayout cc = mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID);
1732        if (progress > 0 && cc.getVisibility() != VISIBLE && !workspaceInModalState()) {
1733            cc.setVisibility(VISIBLE);
1734        }
1735
1736        mLastCustomContentScrollProgress = progress;
1737
1738        // We should only update the drag layer background alpha if we are not in all apps or the
1739        // widgets tray
1740        if (mState == State.NORMAL) {
1741            mLauncher.getDragLayer().setBackgroundAlpha(progress == 1 ? 0 : progress * 0.8f);
1742        }
1743
1744        if (mLauncher.getHotseat() != null) {
1745            mLauncher.getHotseat().setTranslationX(translationX);
1746        }
1747
1748        if (mPageIndicator != null) {
1749            mPageIndicator.setTranslationX(translationX);
1750        }
1751
1752        if (mCustomContentCallbacks != null) {
1753            mCustomContentCallbacks.onScrollProgressChanged(progress);
1754        }
1755    }
1756
1757    protected void onAttachedToWindow() {
1758        super.onAttachedToWindow();
1759        IBinder windowToken = getWindowToken();
1760        mWallpaperOffset.setWindowToken(windowToken);
1761        computeScroll();
1762        mDragController.setWindowToken(windowToken);
1763    }
1764
1765    protected void onDetachedFromWindow() {
1766        super.onDetachedFromWindow();
1767        mWallpaperOffset.setWindowToken(null);
1768    }
1769
1770    protected void onResume() {
1771        // Update wallpaper dimensions if they were changed since last onResume
1772        // (we also always set the wallpaper dimensions in the constructor)
1773        if (LauncherAppState.getInstance().hasWallpaperChangedSinceLastCheck()) {
1774            setWallpaperDimension();
1775        }
1776        mWallpaperOffset.onResume();
1777    }
1778
1779    @Override
1780    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1781        if (mUnlockWallpaperFromDefaultPageOnLayout) {
1782            mWallpaperOffset.setLockToDefaultPage(false);
1783            mUnlockWallpaperFromDefaultPageOnLayout = false;
1784        }
1785        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1786            mWallpaperOffset.syncWithScroll();
1787            mWallpaperOffset.jumpToFinal();
1788        }
1789        super.onLayout(changed, left, top, right, bottom);
1790        mFirstPageScrollX = getScrollForPage(0);
1791        onWorkspaceOverallScrollChanged();
1792
1793        final LayoutTransition transition = getLayoutTransition();
1794        // If the transition is running defer updating max scroll, as some empty pages could
1795        // still be present, and a max scroll change could cause sudden jumps in scroll.
1796        if (transition != null && transition.isRunning()) {
1797            transition.addTransitionListener(new LayoutTransition.TransitionListener() {
1798
1799                @Override
1800                public void startTransition(LayoutTransition transition, ViewGroup container,
1801                                            View view, int transitionType) {
1802                    mIgnoreQsbScroll = true;
1803                }
1804
1805                @Override
1806                public void endTransition(LayoutTransition transition, ViewGroup container,
1807                                          View view, int transitionType) {
1808                    // Wait until all transitions are complete.
1809                    if (!transition.isRunning()) {
1810                        mIgnoreQsbScroll = false;
1811                        transition.removeTransitionListener(this);
1812                        mFirstPageScrollX = getScrollForPage(0);
1813                        onWorkspaceOverallScrollChanged();
1814                    }
1815                }
1816            });
1817        }
1818
1819    }
1820
1821    @Override
1822    public int getDescendantFocusability() {
1823        if (workspaceInModalState()) {
1824            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1825        }
1826        return super.getDescendantFocusability();
1827    }
1828
1829    public boolean workspaceInModalState() {
1830        return mState != State.NORMAL;
1831    }
1832
1833    @Thunk void updateChildrenLayersEnabled(boolean force) {
1834        boolean small = mState == State.OVERVIEW || mIsSwitchingState;
1835        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageInTransition();
1836
1837        if (enableChildrenLayers != mChildrenLayersEnabled) {
1838            mChildrenLayersEnabled = enableChildrenLayers;
1839            if (mChildrenLayersEnabled) {
1840                enableHwLayersOnVisiblePages();
1841            } else {
1842                for (int i = 0; i < getPageCount(); i++) {
1843                    final CellLayout cl = (CellLayout) getChildAt(i);
1844                    cl.enableHardwareLayer(false);
1845                }
1846            }
1847        }
1848    }
1849
1850    private void enableHwLayersOnVisiblePages() {
1851        if (mChildrenLayersEnabled) {
1852            final int screenCount = getChildCount();
1853
1854            float visibleLeft = getViewportOffsetX();
1855            float visibleRight = visibleLeft + getViewportWidth();
1856            float scaleX = getScaleX();
1857            if (scaleX < 1 && scaleX > 0) {
1858                float mid = getMeasuredWidth() / 2;
1859                visibleLeft = mid - ((mid - visibleLeft) / scaleX);
1860                visibleRight = mid + ((visibleRight - mid) / scaleX);
1861            }
1862
1863            int leftScreen = -1;
1864            int rightScreen = -1;
1865            for (int i = numCustomPages(); i < screenCount; i++) {
1866                final View child = getPageAt(i);
1867
1868                float left = child.getLeft() + child.getTranslationX() - getScrollX();
1869                if (left <= visibleRight && (left + child.getMeasuredWidth()) >= visibleLeft) {
1870                    if (leftScreen == -1) {
1871                        leftScreen = i;
1872                    }
1873                    rightScreen = i;
1874                }
1875            }
1876            if (mForceDrawAdjacentPages) {
1877                // In overview mode, make sure that the two side pages are visible.
1878                leftScreen = Utilities.boundToRange(getCurrentPage() - 1,
1879                    numCustomPages(), rightScreen);
1880                rightScreen = Utilities.boundToRange(getCurrentPage() + 1,
1881                    leftScreen, getPageCount() - 1);
1882            }
1883
1884            if (leftScreen == rightScreen) {
1885                // make sure we're caching at least two pages always
1886                if (rightScreen < screenCount - 1) {
1887                    rightScreen++;
1888                } else if (leftScreen > 0) {
1889                    leftScreen--;
1890                }
1891            }
1892
1893            for (int i = numCustomPages(); i < screenCount; i++) {
1894                final CellLayout layout = (CellLayout) getPageAt(i);
1895                // enable layers between left and right screen inclusive.
1896                boolean enableLayer = leftScreen <= i && i <= rightScreen;
1897                layout.enableHardwareLayer(enableLayer);
1898            }
1899        }
1900    }
1901
1902    public void buildPageHardwareLayers() {
1903        // force layers to be enabled just for the call to buildLayer
1904        updateChildrenLayersEnabled(true);
1905        if (getWindowToken() != null) {
1906            final int childCount = getChildCount();
1907            for (int i = 0; i < childCount; i++) {
1908                CellLayout cl = (CellLayout) getChildAt(i);
1909                cl.buildHardwareLayer();
1910            }
1911        }
1912        updateChildrenLayersEnabled(false);
1913    }
1914
1915    protected void onWallpaperTap(MotionEvent ev) {
1916        final int[] position = mTempXY;
1917        getLocationOnScreen(position);
1918
1919        int pointerIndex = ev.getActionIndex();
1920        position[0] += (int) ev.getX(pointerIndex);
1921        position[1] += (int) ev.getY(pointerIndex);
1922
1923        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1924                ev.getAction() == MotionEvent.ACTION_UP
1925                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1926                position[0], position[1], 0, null);
1927    }
1928
1929    public void prepareDragWithProvider(DragPreviewProvider outlineProvider) {
1930        mOutlineProvider = outlineProvider;
1931    }
1932
1933    public void exitWidgetResizeMode() {
1934        DragLayer dragLayer = mLauncher.getDragLayer();
1935        dragLayer.clearResizeFrame();
1936    }
1937
1938    @Override
1939    protected void getFreeScrollPageRange(int[] range) {
1940        getOverviewModePages(range);
1941    }
1942
1943    private void getOverviewModePages(int[] range) {
1944        int start = numCustomPages();
1945        int end = getChildCount() - 1;
1946
1947        range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
1948        range[1] = Math.max(0, end);
1949    }
1950
1951    public void onStartReordering() {
1952        super.onStartReordering();
1953        // Reordering handles its own animations, disable the automatic ones.
1954        disableLayoutTransitions();
1955    }
1956
1957    public void onEndReordering() {
1958        super.onEndReordering();
1959
1960        if (mLauncher.isWorkspaceLoading()) {
1961            // Invalid and dangerous operation if workspace is loading
1962            return;
1963        }
1964
1965        mScreenOrder.clear();
1966        int count = getChildCount();
1967        for (int i = 0; i < count; i++) {
1968            CellLayout cl = ((CellLayout) getChildAt(i));
1969            mScreenOrder.add(getIdForScreen(cl));
1970        }
1971
1972        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1973
1974        // Re-enable auto layout transitions for page deletion.
1975        enableLayoutTransitions();
1976    }
1977
1978    public boolean isInOverviewMode() {
1979        return mState == State.OVERVIEW;
1980    }
1981
1982    public void snapToPageFromOverView(int whichPage) {
1983        mStateTransitionAnimation.snapToPageFromOverView(whichPage);
1984    }
1985
1986    int getOverviewModeTranslationY() {
1987        DeviceProfile grid = mLauncher.getDeviceProfile();
1988        int overviewButtonBarHeight = grid.getOverviewModeButtonBarHeight();
1989
1990        int scaledHeight = (int) (mOverviewModeShrinkFactor * getNormalChildHeight());
1991        Rect workspacePadding = grid.getWorkspacePadding(sTempRect);
1992        int workspaceTop = mInsets.top + workspacePadding.top;
1993        int workspaceBottom = getViewportHeight() - mInsets.bottom - workspacePadding.bottom;
1994        int overviewTop = mInsets.top;
1995        int overviewBottom = getViewportHeight() - mInsets.bottom - overviewButtonBarHeight;
1996        int workspaceOffsetTopEdge = workspaceTop + ((workspaceBottom - workspaceTop) - scaledHeight) / 2;
1997        int overviewOffsetTopEdge = overviewTop + (overviewBottom - overviewTop - scaledHeight) / 2;
1998        return -workspaceOffsetTopEdge + overviewOffsetTopEdge;
1999    }
2000
2001    float getSpringLoadedTranslationY() {
2002        DeviceProfile grid = mLauncher.getDeviceProfile();
2003        if (grid.isVerticalBarLayout() || getChildCount() == 0) {
2004            return 0;
2005        }
2006
2007        float scaledHeight = grid.workspaceSpringLoadShrinkFactor * getNormalChildHeight();
2008        float shrunkTop = mInsets.top + grid.dropTargetBarSizePx;
2009        float shrunkBottom = getViewportHeight() - mInsets.bottom
2010                - grid.getWorkspacePadding(sTempRect).bottom
2011                - grid.workspaceSpringLoadedBottomSpace;
2012        float totalShrunkSpace = shrunkBottom - shrunkTop;
2013
2014        float desiredCellTop = shrunkTop + (totalShrunkSpace - scaledHeight) / 2;
2015
2016        float halfHeight = getHeight() / 2;
2017        float myCenter = getTop() + halfHeight;
2018        float cellTopFromCenter = halfHeight - getChildAt(0).getTop();
2019        float actualCellTop = myCenter - cellTopFromCenter * grid.workspaceSpringLoadShrinkFactor;
2020        return (desiredCellTop - actualCellTop) / grid.workspaceSpringLoadShrinkFactor;
2021    }
2022
2023    float getOverviewModeShrinkFactor() {
2024        return mOverviewModeShrinkFactor;
2025    }
2026
2027    /**
2028     * Sets the current workspace {@link State}, returning an animation transitioning the workspace
2029     * to that new state.
2030     */
2031    public Animator setStateWithAnimation(State toState, boolean animated,
2032            HashMap<View, Integer> layerViews) {
2033        // Create the animation to the new state
2034        AnimatorSet workspaceAnim =  mStateTransitionAnimation.getAnimationToState(mState,
2035                toState, animated, layerViews);
2036
2037        boolean shouldNotifyWidgetChange = !mState.shouldUpdateWidget
2038                && toState.shouldUpdateWidget;
2039        // Update the current state
2040        mState = toState;
2041        updateAccessibilityFlags();
2042
2043        if (shouldNotifyWidgetChange) {
2044            mLauncher.notifyWidgetProvidersChanged();
2045        }
2046
2047        if (mOnStateChangeListener != null) {
2048            mOnStateChangeListener.prepareStateChange(toState, animated ? workspaceAnim : null);
2049        }
2050
2051        return workspaceAnim;
2052    }
2053
2054    public State getState() {
2055        return mState;
2056    }
2057
2058    public void updateAccessibilityFlags() {
2059        // TODO: Update the accessibility flags appropriately when dragging.
2060        if (!mLauncher.getAccessibilityDelegate().isInAccessibleDrag()) {
2061            if (Utilities.ATLEAST_LOLLIPOP) {
2062                int total = getPageCount();
2063                for (int i = numCustomPages(); i < total; i++) {
2064                    updateAccessibilityFlags((CellLayout) getPageAt(i), i);
2065                }
2066                setImportantForAccessibility((mState == State.NORMAL || mState == State.OVERVIEW)
2067                        ? IMPORTANT_FOR_ACCESSIBILITY_AUTO
2068                        : IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
2069            } else {
2070                int accessible = mState == State.NORMAL ?
2071                        IMPORTANT_FOR_ACCESSIBILITY_AUTO :
2072                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
2073                setImportantForAccessibility(accessible);
2074            }
2075        }
2076    }
2077
2078    private void updateAccessibilityFlags(CellLayout page, int pageNo) {
2079        if (mState == State.OVERVIEW) {
2080            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
2081            page.getShortcutsAndWidgets().setImportantForAccessibility(
2082                    IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
2083            page.setContentDescription(getPageDescription(pageNo));
2084
2085            // No custom action for the first page.
2086            if (!FeatureFlags.QSB_ON_FIRST_SCREEN || pageNo > 0) {
2087                if (mPagesAccessibilityDelegate == null) {
2088                    mPagesAccessibilityDelegate = new OverviewScreenAccessibilityDelegate(this);
2089                }
2090                page.setAccessibilityDelegate(mPagesAccessibilityDelegate);
2091            }
2092        } else {
2093            int accessible = mState == State.NORMAL ?
2094                    IMPORTANT_FOR_ACCESSIBILITY_AUTO :
2095                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
2096            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
2097            page.getShortcutsAndWidgets().setImportantForAccessibility(accessible);
2098            page.setContentDescription(null);
2099            page.setAccessibilityDelegate(null);
2100        }
2101    }
2102
2103    @Override
2104    public void onLauncherTransitionPrepare(Launcher l, boolean animated,
2105            boolean multiplePagesVisible) {
2106        mIsSwitchingState = true;
2107        mTransitionProgress = 0;
2108
2109        if (multiplePagesVisible) {
2110            mForceDrawAdjacentPages = true;
2111        }
2112        invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
2113
2114        updateChildrenLayersEnabled(false);
2115        hideCustomContentIfNecessary();
2116    }
2117
2118    @Override
2119    public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) {
2120        if (mPageIndicator != null) {
2121            boolean isNewStateSpringLoaded = mState == State.SPRING_LOADED;
2122            mPageIndicator.setShouldAutoHide(!isNewStateSpringLoaded);
2123            if (isNewStateSpringLoaded) {
2124                // Show the page indicator at the same time as the rest of the transition.
2125                showPageIndicatorAtCurrentScroll();
2126            }
2127        }
2128    }
2129
2130    @Override
2131    public void onLauncherTransitionStep(Launcher l, float t) {
2132        mTransitionProgress = t;
2133    }
2134
2135    @Override
2136    public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) {
2137        mIsSwitchingState = false;
2138        updateChildrenLayersEnabled(false);
2139        showCustomContentIfNecessary();
2140        mForceDrawAdjacentPages = false;
2141        if (mState == State.SPRING_LOADED) {
2142            showPageIndicatorAtCurrentScroll();
2143        }
2144    }
2145
2146    void updateCustomContentVisibility() {
2147        int visibility = mState == Workspace.State.NORMAL ? VISIBLE : INVISIBLE;
2148        setCustomContentVisibility(visibility);
2149    }
2150
2151    void setCustomContentVisibility(int visibility) {
2152        if (hasCustomContent()) {
2153            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(visibility);
2154        }
2155    }
2156
2157    void showCustomContentIfNecessary() {
2158        boolean show  = mState == Workspace.State.NORMAL;
2159        if (show && hasCustomContent()) {
2160            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(VISIBLE);
2161        }
2162    }
2163
2164    void hideCustomContentIfNecessary() {
2165        boolean hide  = mState != Workspace.State.NORMAL;
2166        if (hide && hasCustomContent()) {
2167            disableLayoutTransitions();
2168            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
2169            enableLayoutTransitions();
2170        }
2171    }
2172
2173    /**
2174     * Returns the drawable for the given text view.
2175     */
2176    public static Drawable getTextViewIcon(TextView tv) {
2177        final Drawable[] drawables = tv.getCompoundDrawables();
2178        for (int i = 0; i < drawables.length; i++) {
2179            if (drawables[i] != null) {
2180                return drawables[i];
2181            }
2182        }
2183        return null;
2184    }
2185
2186    public void startDrag(CellLayout.CellInfo cellInfo, DragOptions options) {
2187        View child = cellInfo.cell;
2188
2189        // Make sure the drag was started by a long press as opposed to a long click.
2190        if (!child.isInTouchMode()) {
2191            return;
2192        }
2193
2194        mDragInfo = cellInfo;
2195        child.setVisibility(INVISIBLE);
2196
2197        if (options.isAccessibleDrag) {
2198            mDragController.addDragListener(new AccessibleDragListenerAdapter(
2199                    this, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG) {
2200                @Override
2201                protected void enableAccessibleDrag(boolean enable) {
2202                    super.enableAccessibleDrag(enable);
2203                    setEnableForLayout(mLauncher.getHotseat().getLayout(),enable);
2204
2205                    // We need to allow our individual children to become click handlers in this
2206                    // case, so temporarily unset the click handlers.
2207                    setOnClickListener(enable ? null : mLauncher);
2208                }
2209            });
2210        }
2211
2212        beginDragShared(child, this, options);
2213    }
2214
2215    public void beginDragShared(View child, DragSource source, DragOptions options) {
2216        Object dragObject = child.getTag();
2217        if (!(dragObject instanceof ItemInfo)) {
2218            String msg = "Drag started with a view that has no tag set. This "
2219                    + "will cause a crash (issue 11627249) down the line. "
2220                    + "View: " + child + "  tag: " + child.getTag();
2221            throw new IllegalStateException(msg);
2222        }
2223        beginDragShared(child, source, (ItemInfo) dragObject,
2224                new DragPreviewProvider(child), options);
2225    }
2226
2227
2228    public DragView beginDragShared(View child, DragSource source, ItemInfo dragObject,
2229            DragPreviewProvider previewProvider, DragOptions dragOptions) {
2230        child.clearFocus();
2231        child.setPressed(false);
2232        mOutlineProvider = previewProvider;
2233
2234        // The drag bitmap follows the touch point around on the screen
2235        final Bitmap b = previewProvider.createDragBitmap(mCanvas);
2236        int halfPadding = previewProvider.previewPadding / 2;
2237
2238        float scale = previewProvider.getScaleAndPosition(b, mTempXY);
2239        int dragLayerX = mTempXY[0];
2240        int dragLayerY = mTempXY[1];
2241
2242        DeviceProfile grid = mLauncher.getDeviceProfile();
2243        Point dragVisualizeOffset = null;
2244        Rect dragRect = null;
2245        if (child instanceof BubbleTextView) {
2246            int iconSize = grid.iconSizePx;
2247            int top = child.getPaddingTop();
2248            int left = (b.getWidth() - iconSize) / 2;
2249            int right = left + iconSize;
2250            int bottom = top + iconSize;
2251            dragLayerY += top;
2252            // Note: The drag region is used to calculate drag layer offsets, but the
2253            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2254            dragVisualizeOffset = new Point(- halfPadding, halfPadding);
2255            dragRect = new Rect(left, top, right, bottom);
2256        } else if (child instanceof FolderIcon) {
2257            int previewSize = grid.folderIconSizePx;
2258            dragVisualizeOffset = new Point(- halfPadding, halfPadding - child.getPaddingTop());
2259            dragRect = new Rect(0, child.getPaddingTop(), child.getWidth(), previewSize);
2260        }
2261
2262        // Clear the pressed state if necessary
2263        if (child instanceof BubbleTextView) {
2264            BubbleTextView icon = (BubbleTextView) child;
2265            icon.clearPressedBackground();
2266        }
2267
2268        if (child.getParent() instanceof ShortcutAndWidgetContainer) {
2269            mDragSourceInternal = (ShortcutAndWidgetContainer) child.getParent();
2270        }
2271
2272        if (child instanceof BubbleTextView) {
2273            DeepShortcutsContainer dsc = DeepShortcutsContainer.showForIcon((BubbleTextView) child);
2274            if (dsc != null) {
2275                dragOptions.preDragCondition = dsc.createPreDragCondition();
2276
2277                mLauncher.getUserEventDispatcher().resetElapsedContainerMillis();
2278            }
2279        }
2280
2281        DragView dv = mDragController.startDrag(b, dragLayerX, dragLayerY, source,
2282                dragObject, dragVisualizeOffset, dragRect, scale, dragOptions);
2283        dv.setIntrinsicIconScaleFactor(source.getIntrinsicIconScaleFactor());
2284        b.recycle();
2285        return dv;
2286    }
2287
2288    public boolean transitionStateShouldAllowDrop() {
2289        return ((!isSwitchingState() || mTransitionProgress > 0.5f) &&
2290                (mState == State.NORMAL || mState == State.SPRING_LOADED));
2291    }
2292
2293    /**
2294     * {@inheritDoc}
2295     */
2296    public boolean acceptDrop(DragObject d) {
2297        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2298        CellLayout dropTargetLayout = mDropToLayout;
2299        if (d.dragSource != this) {
2300            // Don't accept the drop if we're not over a screen at time of drop
2301            if (dropTargetLayout == null) {
2302                return false;
2303            }
2304            if (!transitionStateShouldAllowDrop()) return false;
2305
2306            mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2307
2308            // We want the point to be mapped to the dragTarget.
2309            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2310                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2311            } else {
2312                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2313            }
2314
2315            int spanX = 1;
2316            int spanY = 1;
2317            if (mDragInfo != null) {
2318                final CellLayout.CellInfo dragCellInfo = mDragInfo;
2319                spanX = dragCellInfo.spanX;
2320                spanY = dragCellInfo.spanY;
2321            } else {
2322                spanX = d.dragInfo.spanX;
2323                spanY = d.dragInfo.spanY;
2324            }
2325
2326            int minSpanX = spanX;
2327            int minSpanY = spanY;
2328            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2329                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2330                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2331            }
2332
2333            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2334                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2335                    mTargetCell);
2336            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2337                    mDragViewVisualCenter[1], mTargetCell);
2338            if (mCreateUserFolderOnDrop && willCreateUserFolder(d.dragInfo,
2339                    dropTargetLayout, mTargetCell, distance, true)) {
2340                return true;
2341            }
2342
2343            if (mAddToExistingFolderOnDrop && willAddToExistingUserFolder(d.dragInfo,
2344                    dropTargetLayout, mTargetCell, distance)) {
2345                return true;
2346            }
2347
2348            int[] resultSpan = new int[2];
2349            mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2350                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
2351                    null, mTargetCell, resultSpan, CellLayout.MODE_ACCEPT_DROP);
2352            boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2353
2354            // Don't accept the drop if there's no room for the item
2355            if (!foundCell) {
2356                onNoCellFound(dropTargetLayout);
2357                return false;
2358            }
2359        }
2360
2361        long screenId = getIdForScreen(dropTargetLayout);
2362        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
2363            commitExtraEmptyScreen();
2364        }
2365
2366        return true;
2367    }
2368
2369    boolean willCreateUserFolder(ItemInfo info, CellLayout target, int[] targetCell,
2370            float distance, boolean considerTimeout) {
2371        if (distance > mMaxDistanceForFolderCreation) return false;
2372        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2373        return willCreateUserFolder(info, dropOverView, considerTimeout);
2374    }
2375
2376    boolean willCreateUserFolder(ItemInfo info, View dropOverView, boolean considerTimeout) {
2377        if (dropOverView != null) {
2378            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2379            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2380                return false;
2381            }
2382        }
2383
2384        boolean hasntMoved = false;
2385        if (mDragInfo != null) {
2386            hasntMoved = dropOverView == mDragInfo.cell;
2387        }
2388
2389        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2390            return false;
2391        }
2392
2393        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2394        boolean willBecomeShortcut =
2395                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2396                        info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT ||
2397                        info.itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT);
2398
2399        return (aboveShortcut && willBecomeShortcut);
2400    }
2401
2402    boolean willAddToExistingUserFolder(ItemInfo dragInfo, CellLayout target, int[] targetCell,
2403            float distance) {
2404        if (distance > mMaxDistanceForFolderCreation) return false;
2405        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2406        return willAddToExistingUserFolder(dragInfo, dropOverView);
2407
2408    }
2409    boolean willAddToExistingUserFolder(ItemInfo dragInfo, View dropOverView) {
2410        if (dropOverView != null) {
2411            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2412            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2413                return false;
2414            }
2415        }
2416
2417        if (dropOverView instanceof FolderIcon) {
2418            FolderIcon fi = (FolderIcon) dropOverView;
2419            if (fi.acceptDrop(dragInfo)) {
2420                return true;
2421            }
2422        }
2423        return false;
2424    }
2425
2426    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2427            int[] targetCell, float distance, boolean external, DragView dragView,
2428            Runnable postAnimationRunnable) {
2429        if (distance > mMaxDistanceForFolderCreation) return false;
2430        View v = target.getChildAt(targetCell[0], targetCell[1]);
2431
2432        boolean hasntMoved = false;
2433        if (mDragInfo != null) {
2434            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2435            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2436                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2437        }
2438
2439        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2440        mCreateUserFolderOnDrop = false;
2441        final long screenId = getIdForScreen(target);
2442
2443        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2444        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2445
2446        if (aboveShortcut && willBecomeShortcut) {
2447            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2448            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2449            // if the drag started here, we need to remove it from the workspace
2450            if (!external) {
2451                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2452            }
2453
2454            Rect folderLocation = new Rect();
2455            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2456            target.removeView(v);
2457
2458            FolderIcon fi =
2459                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2460            destInfo.cellX = -1;
2461            destInfo.cellY = -1;
2462            sourceInfo.cellX = -1;
2463            sourceInfo.cellY = -1;
2464
2465            // If the dragView is null, we can't animate
2466            boolean animate = dragView != null;
2467            if (animate) {
2468                // In order to keep everything continuous, we hand off the currently rendered
2469                // folder background to the newly created icon. This preserves animation state.
2470                fi.setFolderBackground(mFolderCreateBg);
2471                mFolderCreateBg = new FolderIcon.PreviewBackground();
2472                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2473                        postAnimationRunnable);
2474            } else {
2475                fi.prepareCreate(v);
2476                fi.addItem(destInfo);
2477                fi.addItem(sourceInfo);
2478            }
2479            return true;
2480        }
2481        return false;
2482    }
2483
2484    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2485            float distance, DragObject d, boolean external) {
2486        if (distance > mMaxDistanceForFolderCreation) return false;
2487
2488        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2489        if (!mAddToExistingFolderOnDrop) return false;
2490        mAddToExistingFolderOnDrop = false;
2491
2492        if (dropOverView instanceof FolderIcon) {
2493            FolderIcon fi = (FolderIcon) dropOverView;
2494            if (fi.acceptDrop(d.dragInfo)) {
2495                fi.onDrop(d);
2496
2497                // if the drag started here, we need to remove it from the workspace
2498                if (!external) {
2499                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2500                }
2501                return true;
2502            }
2503        }
2504        return false;
2505    }
2506
2507    @Override
2508    public void prepareAccessibilityDrop() { }
2509
2510    public void onDrop(final DragObject d) {
2511        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2512        CellLayout dropTargetLayout = mDropToLayout;
2513
2514        // We want the point to be mapped to the dragTarget.
2515        if (dropTargetLayout != null) {
2516            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2517                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2518            } else {
2519                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2520            }
2521        }
2522
2523        int snapScreen = -1;
2524        boolean resizeOnDrop = false;
2525        if (d.dragSource != this) {
2526            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2527                    (int) mDragViewVisualCenter[1] };
2528            onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d);
2529        } else if (mDragInfo != null) {
2530            final View cell = mDragInfo.cell;
2531
2532            if (dropTargetLayout != null && !d.cancelled) {
2533                // Move internally
2534                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2535                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2536                long container = hasMovedIntoHotseat ?
2537                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2538                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2539                long screenId = (mTargetCell[0] < 0) ?
2540                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2541                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2542                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2543                // First we find the cell nearest to point at which the item is
2544                // dropped, without any consideration to whether there is an item there.
2545
2546                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2547                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2548                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2549                        mDragViewVisualCenter[1], mTargetCell);
2550
2551                // If the item being dropped is a shortcut and the nearest drop
2552                // cell also contains a shortcut, then create a folder with the two shortcuts.
2553                if (!mInScrollArea && createUserFolderIfNecessary(cell, container,
2554                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2555                    return;
2556                }
2557
2558                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2559                        distance, d, false)) {
2560                    return;
2561                }
2562
2563                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2564                // we need to find the nearest cell location that is vacant
2565                ItemInfo item = d.dragInfo;
2566                int minSpanX = item.spanX;
2567                int minSpanY = item.spanY;
2568                if (item.minSpanX > 0 && item.minSpanY > 0) {
2569                    minSpanX = item.minSpanX;
2570                    minSpanY = item.minSpanY;
2571                }
2572
2573                int[] resultSpan = new int[2];
2574                mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2575                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2576                        mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2577
2578                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2579
2580                // if the widget resizes on drop
2581                if (foundCell && (cell instanceof AppWidgetHostView) &&
2582                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2583                    resizeOnDrop = true;
2584                    item.spanX = resultSpan[0];
2585                    item.spanY = resultSpan[1];
2586                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2587                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2588                            resultSpan[1]);
2589                }
2590
2591                if (foundCell) {
2592                    if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2593                        snapScreen = getPageIndexForScreenId(screenId);
2594                        snapToPage(snapScreen);
2595                    }
2596
2597                    final ItemInfo info = (ItemInfo) cell.getTag();
2598                    if (hasMovedLayouts) {
2599                        // Reparent the view
2600                        CellLayout parentCell = getParentCellLayoutForView(cell);
2601                        if (parentCell != null) {
2602                            parentCell.removeView(cell);
2603                        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
2604                            throw new NullPointerException("mDragInfo.cell has null parent");
2605                        }
2606                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2607                                info.spanX, info.spanY);
2608                    }
2609
2610                    // update the item's position after drop
2611                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2612                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2613                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2614                    lp.cellHSpan = item.spanX;
2615                    lp.cellVSpan = item.spanY;
2616                    lp.isLockedToGrid = true;
2617
2618                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2619                            cell instanceof LauncherAppWidgetHostView) {
2620                        final CellLayout cellLayout = dropTargetLayout;
2621                        // We post this call so that the widget has a chance to be placed
2622                        // in its final location
2623
2624                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2625                        AppWidgetProviderInfo pInfo = hostView.getAppWidgetInfo();
2626                        if (pInfo != null && pInfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE
2627                                && !d.accessibleDrag) {
2628                            mDelayedResizeRunnable = new Runnable() {
2629                                public void run() {
2630                                    if (!isPageInTransition() && !mIsSwitchingState) {
2631                                        DragLayer dragLayer = mLauncher.getDragLayer();
2632                                        dragLayer.addResizeFrame(hostView, cellLayout);
2633                                    }
2634                                }
2635                            };
2636                        }
2637                    }
2638
2639                    LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, lp.cellX,
2640                            lp.cellY, item.spanX, item.spanY);
2641                } else {
2642                    onNoCellFound(dropTargetLayout);
2643
2644                    // If we can't find a drop location, we return the item to its original position
2645                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2646                    mTargetCell[0] = lp.cellX;
2647                    mTargetCell[1] = lp.cellY;
2648                    CellLayout layout = (CellLayout) cell.getParent().getParent();
2649                    layout.markCellsAsOccupiedForView(cell);
2650                }
2651            }
2652
2653            final CellLayout parent = (CellLayout) cell.getParent().getParent();
2654            // Prepare it to be animated into its new position
2655            // This must be called after the view has been re-parented
2656            final Runnable onCompleteRunnable = new Runnable() {
2657                @Override
2658                public void run() {
2659                    mAnimatingViewIntoPlace = false;
2660                    updateChildrenLayersEnabled(false);
2661                }
2662            };
2663            mAnimatingViewIntoPlace = true;
2664            if (d.dragView.hasDrawn()) {
2665                final ItemInfo info = (ItemInfo) cell.getTag();
2666                boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
2667                        || info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
2668                if (isWidget) {
2669                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2670                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2671                    animateWidgetDrop(info, parent, d.dragView,
2672                            onCompleteRunnable, animationType, cell, false);
2673                } else {
2674                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2675                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2676                            onCompleteRunnable, this);
2677                }
2678            } else {
2679                d.deferDragViewCleanupPostAnimation = false;
2680                cell.setVisibility(VISIBLE);
2681            }
2682            parent.onDropChild(cell);
2683        }
2684        if (d.stateAnnouncer != null) {
2685            d.stateAnnouncer.completeAction(R.string.item_moved);
2686        }
2687    }
2688
2689    public void onNoCellFound(View dropTargetLayout) {
2690        if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2691            Hotseat hotseat = mLauncher.getHotseat();
2692            boolean droppedOnAllAppsIcon = !FeatureFlags.NO_ALL_APPS_ICON
2693                    && mTargetCell != null && !mLauncher.getDeviceProfile().inv.isAllAppsButtonRank(
2694                    hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]));
2695            if (!droppedOnAllAppsIcon) {
2696                // Only show message when hotseat is full and drop target was not AllApps button
2697                showOutOfSpaceMessage(true);
2698            }
2699        } else {
2700            showOutOfSpaceMessage(false);
2701        }
2702    }
2703
2704    private void showOutOfSpaceMessage(boolean isHotseatLayout) {
2705        int strId = (isHotseatLayout ? R.string.hotseat_out_of_space : R.string.out_of_space);
2706        Toast.makeText(mLauncher, mLauncher.getString(strId), Toast.LENGTH_SHORT).show();
2707    }
2708
2709    /**
2710     * Computes the area relative to dragLayer which is used to display a page.
2711     */
2712    public void getPageAreaRelativeToDragLayer(Rect outArea) {
2713        CellLayout child = (CellLayout) getChildAt(getNextPage());
2714        if (child == null) {
2715            return;
2716        }
2717        ShortcutAndWidgetContainer boundingLayout = child.getShortcutsAndWidgets();
2718
2719        // Use the absolute left instead of the child left, as we want the visible area
2720        // irrespective of the visible child. Since the view can only scroll horizontally, the
2721        // top position is not affected.
2722        mTempXY[0] = getViewportOffsetX() + getPaddingLeft() + boundingLayout.getLeft();
2723        mTempXY[1] = child.getTop() + boundingLayout.getTop();
2724
2725        float scale = mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY);
2726        outArea.set(mTempXY[0], mTempXY[1],
2727                (int) (mTempXY[0] + scale * boundingLayout.getMeasuredWidth()),
2728                (int) (mTempXY[1] + scale * boundingLayout.getMeasuredHeight()));
2729    }
2730
2731    @Override
2732    public void onDragEnter(DragObject d) {
2733        if (ENFORCE_DRAG_EVENT_ORDER) {
2734            enforceDragParity("onDragEnter", 1, 1);
2735        }
2736
2737        mCreateUserFolderOnDrop = false;
2738        mAddToExistingFolderOnDrop = false;
2739
2740        mDropToLayout = null;
2741        setDropLayoutForDragObject(d);
2742
2743        if (!workspaceInModalState() && FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND) {
2744            mLauncher.getDragLayer().showPageHints();
2745        }
2746    }
2747
2748    @Override
2749    public void onDragExit(DragObject d) {
2750        if (ENFORCE_DRAG_EVENT_ORDER) {
2751            enforceDragParity("onDragExit", -1, 0);
2752        }
2753
2754        // Here we store the final page that will be dropped to, if the workspace in fact
2755        // receives the drop
2756        if (mInScrollArea) {
2757            if (isPageInTransition()) {
2758                // If the user drops while the page is scrolling, we should use that page as the
2759                // destination instead of the page that is being hovered over.
2760                mDropToLayout = (CellLayout) getPageAt(getNextPage());
2761            } else {
2762                mDropToLayout = mDragOverlappingLayout;
2763            }
2764        } else {
2765            mDropToLayout = mDragTargetLayout;
2766        }
2767
2768        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2769            mCreateUserFolderOnDrop = true;
2770        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2771            mAddToExistingFolderOnDrop = true;
2772        }
2773
2774        // Reset the scroll area and previous drag target
2775        onResetScrollArea();
2776        setCurrentDropLayout(null);
2777        setCurrentDragOverlappingLayout(null);
2778
2779        mSpringLoadedDragController.cancel();
2780
2781        mLauncher.getDragLayer().hidePageHints();
2782    }
2783
2784    private void enforceDragParity(String event, int update, int expectedValue) {
2785        enforceDragParity(this, event, update, expectedValue);
2786        for (int i = 0; i < getChildCount(); i++) {
2787            enforceDragParity(getChildAt(i), event, update, expectedValue);
2788        }
2789    }
2790
2791    private void enforceDragParity(View v, String event, int update, int expectedValue) {
2792        Object tag = v.getTag(R.id.drag_event_parity);
2793        int value = tag == null ? 0 : (Integer) tag;
2794        value += update;
2795        v.setTag(R.id.drag_event_parity, value);
2796
2797        if (value != expectedValue) {
2798            Log.e(TAG, event + ": Drag contract violated: " + value);
2799        }
2800    }
2801
2802    void setCurrentDropLayout(CellLayout layout) {
2803        if (mDragTargetLayout != null) {
2804            mDragTargetLayout.revertTempState();
2805            mDragTargetLayout.onDragExit();
2806        }
2807        mDragTargetLayout = layout;
2808        if (mDragTargetLayout != null) {
2809            mDragTargetLayout.onDragEnter();
2810        }
2811        cleanupReorder(true);
2812        cleanupFolderCreation();
2813        setCurrentDropOverCell(-1, -1);
2814    }
2815
2816    void setCurrentDragOverlappingLayout(CellLayout layout) {
2817        if (mDragOverlappingLayout != null) {
2818            mDragOverlappingLayout.setIsDragOverlapping(false);
2819        }
2820        mDragOverlappingLayout = layout;
2821        if (mDragOverlappingLayout != null) {
2822            mDragOverlappingLayout.setIsDragOverlapping(true);
2823        }
2824        // Invalidating the scrim will also force this CellLayout
2825        // to be invalidated so that it is highlighted if necessary.
2826        mLauncher.getDragLayer().invalidateScrim();
2827    }
2828
2829    public CellLayout getCurrentDragOverlappingLayout() {
2830        return mDragOverlappingLayout;
2831    }
2832
2833    void setCurrentDropOverCell(int x, int y) {
2834        if (x != mDragOverX || y != mDragOverY) {
2835            mDragOverX = x;
2836            mDragOverY = y;
2837            setDragMode(DRAG_MODE_NONE);
2838        }
2839    }
2840
2841    void setDragMode(int dragMode) {
2842        if (dragMode != mDragMode) {
2843            if (dragMode == DRAG_MODE_NONE) {
2844                cleanupAddToFolder();
2845                // We don't want to cancel the re-order alarm every time the target cell changes
2846                // as this feels to slow / unresponsive.
2847                cleanupReorder(false);
2848                cleanupFolderCreation();
2849            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2850                cleanupReorder(true);
2851                cleanupFolderCreation();
2852            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2853                cleanupAddToFolder();
2854                cleanupReorder(true);
2855            } else if (dragMode == DRAG_MODE_REORDER) {
2856                cleanupAddToFolder();
2857                cleanupFolderCreation();
2858            }
2859            mDragMode = dragMode;
2860        }
2861    }
2862
2863    private void cleanupFolderCreation() {
2864        if (mFolderCreateBg != null) {
2865            mFolderCreateBg.animateToRest();
2866        }
2867        mFolderCreationAlarm.setOnAlarmListener(null);
2868        mFolderCreationAlarm.cancelAlarm();
2869    }
2870
2871    private void cleanupAddToFolder() {
2872        if (mDragOverFolderIcon != null) {
2873            mDragOverFolderIcon.onDragExit();
2874            mDragOverFolderIcon = null;
2875        }
2876    }
2877
2878    private void cleanupReorder(boolean cancelAlarm) {
2879        // Any pending reorders are canceled
2880        if (cancelAlarm) {
2881            mReorderAlarm.cancelAlarm();
2882        }
2883        mLastReorderX = -1;
2884        mLastReorderY = -1;
2885    }
2886
2887   /*
2888    *
2889    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
2890    * coordinate space. The argument xy is modified with the return result.
2891    */
2892   void mapPointFromSelfToChild(View v, float[] xy) {
2893       xy[0] = xy[0] - v.getLeft();
2894       xy[1] = xy[1] - v.getTop();
2895   }
2896
2897   boolean isPointInSelfOverHotseat(int x, int y) {
2898       mTempXY[0] = x;
2899       mTempXY[1] = y;
2900       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2901       View hotseat = mLauncher.getHotseat();
2902       return mTempXY[0] >= hotseat.getLeft() &&
2903               mTempXY[0] <= hotseat.getRight() &&
2904               mTempXY[1] >= hotseat.getTop() &&
2905               mTempXY[1] <= hotseat.getBottom();
2906   }
2907
2908   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
2909       mTempXY[0] = (int) xy[0];
2910       mTempXY[1] = (int) xy[1];
2911       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2912       mLauncher.getDragLayer().mapCoordInSelfToDescendant(hotseat.getLayout(), mTempXY);
2913
2914       xy[0] = mTempXY[0];
2915       xy[1] = mTempXY[1];
2916   }
2917
2918   /*
2919    *
2920    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
2921    * the parent View's coordinate space. The argument xy is modified with the return result.
2922    *
2923    */
2924   void mapPointFromChildToSelf(View v, float[] xy) {
2925       xy[0] += v.getLeft();
2926       xy[1] += v.getTop();
2927   }
2928
2929   static private float squaredDistance(float[] point1, float[] point2) {
2930        float distanceX = point1[0] - point2[0];
2931        float distanceY = point2[1] - point2[1];
2932        return distanceX * distanceX + distanceY * distanceY;
2933   }
2934
2935    /*
2936     *
2937     * This method returns the CellLayout that is currently being dragged to. In order to drag
2938     * to a CellLayout, either the touch point must be directly over the CellLayout, or as a second
2939     * strategy, we see if the dragView is overlapping any CellLayout and choose the closest one
2940     *
2941     * Return null if no CellLayout is currently being dragged over
2942     *
2943     */
2944    private CellLayout findMatchingPageForDragOver(
2945            DragView dragView, float originX, float originY, boolean exact) {
2946        // We loop through all the screens (ie CellLayouts) and see which ones overlap
2947        // with the item being dragged and then choose the one that's closest to the touch point
2948        final int screenCount = getChildCount();
2949        CellLayout bestMatchingScreen = null;
2950        float smallestDistSoFar = Float.MAX_VALUE;
2951
2952        for (int i = 0; i < screenCount; i++) {
2953            // The custom content screen is not a valid drag over option
2954            if (mScreenOrder.get(i) == CUSTOM_CONTENT_SCREEN_ID) {
2955                continue;
2956            }
2957
2958            CellLayout cl = (CellLayout) getChildAt(i);
2959
2960            final float[] touchXy = {originX, originY};
2961            mapPointFromSelfToChild(cl, touchXy);
2962
2963            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
2964                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
2965                return cl;
2966            }
2967
2968            if (!exact) {
2969                // Get the center of the cell layout in screen coordinates
2970                final float[] cellLayoutCenter = mTempCellLayoutCenterCoordinates;
2971                cellLayoutCenter[0] = cl.getWidth()/2;
2972                cellLayoutCenter[1] = cl.getHeight()/2;
2973                mapPointFromChildToSelf(cl, cellLayoutCenter);
2974
2975                touchXy[0] = originX;
2976                touchXy[1] = originY;
2977
2978                // Calculate the distance between the center of the CellLayout
2979                // and the touch point
2980                float dist = squaredDistance(touchXy, cellLayoutCenter);
2981
2982                if (dist < smallestDistSoFar) {
2983                    smallestDistSoFar = dist;
2984                    bestMatchingScreen = cl;
2985                }
2986            }
2987        }
2988        return bestMatchingScreen;
2989    }
2990
2991    private boolean isDragWidget(DragObject d) {
2992        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
2993                d.dragInfo instanceof PendingAddWidgetInfo);
2994    }
2995
2996    public void onDragOver(DragObject d) {
2997        // Skip drag over events while we are dragging over side pages
2998        if (mInScrollArea || !transitionStateShouldAllowDrop()) return;
2999
3000        ItemInfo item = d.dragInfo;
3001        if (item == null) {
3002            if (ProviderConfig.IS_DOGFOOD_BUILD) {
3003                throw new NullPointerException("DragObject has null info");
3004            }
3005            return;
3006        }
3007
3008        // Ensure that we have proper spans for the item that we are dropping
3009        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
3010        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
3011
3012        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
3013        if (setDropLayoutForDragObject(d)) {
3014            boolean isInSpringLoadedMode = (mState == State.SPRING_LOADED);
3015            if (isInSpringLoadedMode) {
3016                if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3017                    mSpringLoadedDragController.cancel();
3018                } else {
3019                    mSpringLoadedDragController.setAlarm(mDragTargetLayout);
3020                }
3021            }
3022        }
3023
3024        // Handle the drag over
3025        if (mDragTargetLayout != null) {
3026            // We want the point to be mapped to the dragTarget.
3027            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3028                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
3029            } else {
3030                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter);
3031            }
3032
3033            int minSpanX = item.spanX;
3034            int minSpanY = item.spanY;
3035            if (item.minSpanX > 0 && item.minSpanY > 0) {
3036                minSpanX = item.minSpanX;
3037                minSpanY = item.minSpanY;
3038            }
3039
3040            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3041                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY,
3042                    mDragTargetLayout, mTargetCell);
3043            int reorderX = mTargetCell[0];
3044            int reorderY = mTargetCell[1];
3045
3046            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
3047
3048            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
3049                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
3050
3051            manageFolderFeedback(mDragTargetLayout, mTargetCell, targetCellDistance, d);
3052
3053            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3054                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3055                    item.spanY, child, mTargetCell);
3056
3057            if (!nearestDropOccupied) {
3058                mDragTargetLayout.visualizeDropLocation(child, mOutlineProvider,
3059                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false, d);
3060            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3061                    && !mReorderAlarm.alarmPending() && (mLastReorderX != reorderX ||
3062                    mLastReorderY != reorderY)) {
3063
3064                int[] resultSpan = new int[2];
3065                mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3066                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, item.spanX, item.spanY,
3067                        child, mTargetCell, resultSpan, CellLayout.MODE_SHOW_REORDER_HINT);
3068
3069                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3070                // reorder, then we schedule a reorder
3071                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3072                        minSpanX, minSpanY, item.spanX, item.spanY, d, child);
3073                mReorderAlarm.setOnAlarmListener(listener);
3074                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3075            }
3076
3077            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3078                    !nearestDropOccupied) {
3079                if (mDragTargetLayout != null) {
3080                    mDragTargetLayout.revertTempState();
3081                }
3082            }
3083        }
3084    }
3085
3086    /**
3087     * Updates {@link #mDragTargetLayout} and {@link #mDragOverlappingLayout}
3088     * based on the DragObject's position.
3089     *
3090     * The layout will be:
3091     * - The Hotseat if the drag object is over it
3092     * - A side page if we are in spring-loaded mode and the drag object is over it
3093     * - The current page otherwise
3094     *
3095     * @return whether the layout is different from the current {@link #mDragTargetLayout}.
3096     */
3097    private boolean setDropLayoutForDragObject(DragObject d) {
3098        CellLayout layout = null;
3099        // Test to see if we are over the hotseat first
3100        if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3101            if (isPointInSelfOverHotseat(d.x, d.y)) {
3102                layout = mLauncher.getHotseat().getLayout();
3103            }
3104        }
3105        if (layout == null) {
3106            // Identify whether we have dragged over a side page,
3107            // otherwise just use the current page
3108            layout = workspaceInModalState() ?
3109                    findMatchingPageForDragOver(d.dragView, d.x, d.y, false)
3110                    : getCurrentDropLayout();
3111        }
3112        if (layout != mDragTargetLayout) {
3113            setCurrentDropLayout(layout);
3114            setCurrentDragOverlappingLayout(layout);
3115            return true;
3116        }
3117        return false;
3118    }
3119
3120    private void manageFolderFeedback(CellLayout targetLayout,
3121            int[] targetCell, float distance, DragObject dragObject) {
3122        if (distance > mMaxDistanceForFolderCreation) return;
3123
3124        final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0], mTargetCell[1]);
3125        ItemInfo info = dragObject.dragInfo;
3126        boolean userFolderPending = willCreateUserFolder(info, dragOverView, false);
3127        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3128                !mFolderCreationAlarm.alarmPending()) {
3129
3130            FolderCreationAlarmListener listener = new
3131                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]);
3132
3133            if (!dragObject.accessibleDrag) {
3134                mFolderCreationAlarm.setOnAlarmListener(listener);
3135                mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3136            } else {
3137                listener.onAlarm(mFolderCreationAlarm);
3138            }
3139
3140            if (dragObject.stateAnnouncer != null) {
3141                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3142                        .getDescriptionForDropOver(dragOverView, getContext()));
3143            }
3144            return;
3145        }
3146
3147        boolean willAddToFolder = willAddToExistingUserFolder(info, dragOverView);
3148        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3149            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3150            mDragOverFolderIcon.onDragEnter(info);
3151            if (targetLayout != null) {
3152                targetLayout.clearDragOutlines();
3153            }
3154            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3155
3156            if (dragObject.stateAnnouncer != null) {
3157                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3158                        .getDescriptionForDropOver(dragOverView, getContext()));
3159            }
3160            return;
3161        }
3162
3163        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3164            setDragMode(DRAG_MODE_NONE);
3165        }
3166        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3167            setDragMode(DRAG_MODE_NONE);
3168        }
3169    }
3170
3171    class FolderCreationAlarmListener implements OnAlarmListener {
3172        CellLayout layout;
3173        int cellX;
3174        int cellY;
3175
3176        FolderIcon.PreviewBackground bg = new FolderIcon.PreviewBackground();
3177
3178        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3179            this.layout = layout;
3180            this.cellX = cellX;
3181            this.cellY = cellY;
3182
3183            DeviceProfile grid = mLauncher.getDeviceProfile();
3184            BubbleTextView cell = (BubbleTextView) layout.getChildAt(cellX, cellY);
3185
3186            bg.setup(getResources().getDisplayMetrics(), grid, null,
3187                    cell.getMeasuredWidth(), cell.getPaddingTop());
3188
3189            // The full preview background should appear behind the icon
3190            bg.isClipping = false;
3191        }
3192
3193        public void onAlarm(Alarm alarm) {
3194            mFolderCreateBg = bg;
3195            mFolderCreateBg.animateToAccept(layout, cellX, cellY);
3196            layout.clearDragOutlines();
3197            setDragMode(DRAG_MODE_CREATE_FOLDER);
3198        }
3199    }
3200
3201    class ReorderAlarmListener implements OnAlarmListener {
3202        float[] dragViewCenter;
3203        int minSpanX, minSpanY, spanX, spanY;
3204        DragObject dragObject;
3205        View child;
3206
3207        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3208                int spanY, DragObject dragObject, View child) {
3209            this.dragViewCenter = dragViewCenter;
3210            this.minSpanX = minSpanX;
3211            this.minSpanY = minSpanY;
3212            this.spanX = spanX;
3213            this.spanY = spanY;
3214            this.child = child;
3215            this.dragObject = dragObject;
3216        }
3217
3218        public void onAlarm(Alarm alarm) {
3219            int[] resultSpan = new int[2];
3220            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3221                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, mDragTargetLayout,
3222                    mTargetCell);
3223            mLastReorderX = mTargetCell[0];
3224            mLastReorderY = mTargetCell[1];
3225
3226            mTargetCell = mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3227                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3228                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3229
3230            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3231                mDragTargetLayout.revertTempState();
3232            } else {
3233                setDragMode(DRAG_MODE_REORDER);
3234            }
3235
3236            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3237            mDragTargetLayout.visualizeDropLocation(child, mOutlineProvider,
3238                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize, dragObject);
3239        }
3240    }
3241
3242    @Override
3243    public void getHitRectRelativeToDragLayer(Rect outRect) {
3244        // We want the workspace to have the whole area of the display (it will find the correct
3245        // cell layout to drop to in the existing drag/drop logic.
3246        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3247    }
3248
3249    /**
3250     * Drop an item that didn't originate on one of the workspace screens.
3251     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3252     * come from another app altogether.
3253     *
3254     * NOTE: This can also be called when we are outside of a drag event, when we want
3255     * to add an item to one of the workspace screens.
3256     */
3257    private void onDropExternal(final int[] touchXY, final ItemInfo dragInfo,
3258            final CellLayout cellLayout, boolean insertAtFirst, DragObject d) {
3259        final Runnable exitSpringLoadedRunnable = new Runnable() {
3260            @Override
3261            public void run() {
3262                mLauncher.exitSpringLoadedDragModeDelayed(true,
3263                        Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
3264            }
3265        };
3266
3267        ItemInfo info = dragInfo;
3268        int spanX = info.spanX;
3269        int spanY = info.spanY;
3270        if (mDragInfo != null) {
3271            spanX = mDragInfo.spanX;
3272            spanY = mDragInfo.spanY;
3273        }
3274
3275        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3276                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3277                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3278        final long screenId = getIdForScreen(cellLayout);
3279        if (!mLauncher.isHotseatLayout(cellLayout)
3280                && screenId != getScreenIdForPageIndex(mCurrentPage)
3281                && mState != State.SPRING_LOADED) {
3282            snapToScreenId(screenId, null);
3283        }
3284
3285        if (info instanceof PendingAddItemInfo) {
3286            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo;
3287
3288            boolean findNearestVacantCell = true;
3289            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3290                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3291                        cellLayout, mTargetCell);
3292                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3293                        mDragViewVisualCenter[1], mTargetCell);
3294                if (willCreateUserFolder(d.dragInfo, cellLayout, mTargetCell, distance, true)
3295                        || willAddToExistingUserFolder(
3296                                d.dragInfo, cellLayout, mTargetCell, distance)) {
3297                    findNearestVacantCell = false;
3298                }
3299            }
3300
3301            final ItemInfo item = d.dragInfo;
3302            boolean updateWidgetSize = false;
3303            if (findNearestVacantCell) {
3304                int minSpanX = item.spanX;
3305                int minSpanY = item.spanY;
3306                if (item.minSpanX > 0 && item.minSpanY > 0) {
3307                    minSpanX = item.minSpanX;
3308                    minSpanY = item.minSpanY;
3309                }
3310                int[] resultSpan = new int[2];
3311                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3312                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3313                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3314
3315                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3316                    updateWidgetSize = true;
3317                }
3318                item.spanX = resultSpan[0];
3319                item.spanY = resultSpan[1];
3320            }
3321
3322            Runnable onAnimationCompleteRunnable = new Runnable() {
3323                @Override
3324                public void run() {
3325                    // Normally removeExtraEmptyScreen is called in Workspace#onDragEnd, but when
3326                    // adding an item that may not be dropped right away (due to a config activity)
3327                    // we defer the removal until the activity returns.
3328                    deferRemoveExtraEmptyScreen();
3329
3330                    // When dragging and dropping from customization tray, we deal with creating
3331                    // widgets/shortcuts/folders in a slightly different way
3332                    mLauncher.addPendingItem(pendingInfo, container, screenId, mTargetCell,
3333                            item.spanX, item.spanY);
3334                }
3335            };
3336            boolean isWidget = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3337                    || pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3338
3339            AppWidgetHostView finalView = isWidget ?
3340                    ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3341
3342            if (finalView != null && updateWidgetSize) {
3343                AppWidgetResizeFrame.updateWidgetSizeRanges(finalView, mLauncher, item.spanX,
3344                        item.spanY);
3345            }
3346
3347            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3348            if (isWidget && ((PendingAddWidgetInfo) pendingInfo).info != null &&
3349                    ((PendingAddWidgetInfo) pendingInfo).info.configure != null) {
3350                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3351            }
3352            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3353                    animationStyle, finalView, true);
3354        } else {
3355            // This is for other drag/drop cases, like dragging from All Apps
3356            View view = null;
3357
3358            switch (info.itemType) {
3359            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3360            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3361            case LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT:
3362                if (info.container == NO_ID && info instanceof AppInfo) {
3363                    // Came from all apps -- make a copy
3364                    info = ((AppInfo) info).makeShortcut();
3365                    d.dragInfo = info;
3366                }
3367                view = mLauncher.createShortcut(cellLayout, (ShortcutInfo) info);
3368                break;
3369            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3370                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3371                        (FolderInfo) info, mIconCache);
3372                break;
3373            default:
3374                throw new IllegalStateException("Unknown item type: " + info.itemType);
3375            }
3376
3377            // First we find the cell nearest to point at which the item is
3378            // dropped, without any consideration to whether there is an item there.
3379            if (touchXY != null) {
3380                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3381                        cellLayout, mTargetCell);
3382                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3383                        mDragViewVisualCenter[1], mTargetCell);
3384                d.postAnimationRunnable = exitSpringLoadedRunnable;
3385                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3386                        true, d.dragView, d.postAnimationRunnable)) {
3387                    return;
3388                }
3389                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3390                        true)) {
3391                    return;
3392                }
3393            }
3394
3395            if (touchXY != null) {
3396                // when dragging and dropping, just find the closest free spot
3397                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3398                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3399                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3400            } else {
3401                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3402            }
3403            // Add the item to DB before adding to screen ensures that the container and other
3404            // values of the info is properly updated.
3405            LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId,
3406                    mTargetCell[0], mTargetCell[1]);
3407
3408            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1], info.spanX,
3409                    info.spanY, insertAtFirst);
3410            cellLayout.onDropChild(view);
3411            cellLayout.getShortcutsAndWidgets().measureChild(view);
3412
3413            if (d.dragView != null) {
3414                // We wrap the animation call in the temporary set and reset of the current
3415                // cellLayout to its final transform -- this means we animate the drag view to
3416                // the correct final location.
3417                setFinalTransitionTransform(cellLayout);
3418                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3419                        exitSpringLoadedRunnable, this);
3420                resetTransitionTransform(cellLayout);
3421            }
3422        }
3423    }
3424
3425    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3426        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo, false);
3427        int visibility = layout.getVisibility();
3428        layout.setVisibility(VISIBLE);
3429
3430        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3431        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3432        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3433                Bitmap.Config.ARGB_8888);
3434        mCanvas.setBitmap(b);
3435
3436        layout.measure(width, height);
3437        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3438        layout.draw(mCanvas);
3439        mCanvas.setBitmap(null);
3440        layout.setVisibility(visibility);
3441        return b;
3442    }
3443
3444    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3445            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell, boolean scale) {
3446        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3447        // location and size on the home screen.
3448        int spanX = info.spanX;
3449        int spanY = info.spanY;
3450
3451        Rect r = estimateItemPosition(layout, targetCell[0], targetCell[1], spanX, spanY);
3452        loc[0] = r.left;
3453        loc[1] = r.top;
3454
3455        setFinalTransitionTransform(layout);
3456        float cellLayoutScale =
3457                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3458        resetTransitionTransform(layout);
3459
3460        float dragViewScaleX;
3461        float dragViewScaleY;
3462        if (scale) {
3463            dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3464            dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3465        } else {
3466            dragViewScaleX = 1f;
3467            dragViewScaleY = 1f;
3468        }
3469
3470        // The animation will scale the dragView about its center, so we need to center about
3471        // the final location.
3472        loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2
3473                - Math.ceil(layout.getUnusedHorizontalSpace() / 2f);
3474        loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3475
3476        scaleXY[0] = dragViewScaleX * cellLayoutScale;
3477        scaleXY[1] = dragViewScaleY * cellLayoutScale;
3478    }
3479
3480    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, final DragView dragView,
3481            final Runnable onCompleteRunnable, int animationType, final View finalView,
3482            boolean external) {
3483        Rect from = new Rect();
3484        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3485
3486        int[] finalPos = new int[2];
3487        float scaleXY[] = new float[2];
3488        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3489        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3490                scalePreview);
3491
3492        Resources res = mLauncher.getResources();
3493        final int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3494
3495        boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET ||
3496                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3497        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3498            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3499            dragView.setCrossFadeBitmap(crossFadeBitmap);
3500            dragView.crossFade((int) (duration * 0.8f));
3501        } else if (isWidget && external) {
3502            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3503        }
3504
3505        DragLayer dragLayer = mLauncher.getDragLayer();
3506        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3507            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3508                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3509        } else {
3510            int endStyle;
3511            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3512                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3513            } else {
3514                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;
3515            }
3516
3517            Runnable onComplete = new Runnable() {
3518                @Override
3519                public void run() {
3520                    if (finalView != null) {
3521                        finalView.setVisibility(VISIBLE);
3522                    }
3523                    if (onCompleteRunnable != null) {
3524                        onCompleteRunnable.run();
3525                    }
3526                }
3527            };
3528            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3529                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3530                    duration, this);
3531        }
3532    }
3533
3534    public void setFinalTransitionTransform(CellLayout layout) {
3535        if (isSwitchingState()) {
3536            mCurrentScale = getScaleX();
3537            setScaleX(mStateTransitionAnimation.getFinalScale());
3538            setScaleY(mStateTransitionAnimation.getFinalScale());
3539        }
3540    }
3541    public void resetTransitionTransform(CellLayout layout) {
3542        if (isSwitchingState()) {
3543            setScaleX(mCurrentScale);
3544            setScaleY(mCurrentScale);
3545        }
3546    }
3547
3548    public WorkspaceStateTransitionAnimation getStateTransitionAnimation() {
3549        return mStateTransitionAnimation;
3550    }
3551
3552    /**
3553     * Return the current {@link CellLayout}, correctly picking the destination
3554     * screen while a scroll is in progress.
3555     */
3556    public CellLayout getCurrentDropLayout() {
3557        return (CellLayout) getChildAt(getNextPage());
3558    }
3559
3560    /**
3561     * Return the current CellInfo describing our current drag; this method exists
3562     * so that Launcher can sync this object with the correct info when the activity is created/
3563     * destroyed
3564     *
3565     */
3566    public CellLayout.CellInfo getDragInfo() {
3567        return mDragInfo;
3568    }
3569
3570    public int getCurrentPageOffsetFromCustomContent() {
3571        return getNextPage() - numCustomPages();
3572    }
3573
3574    /**
3575     * Calculate the nearest cell where the given object would be dropped.
3576     *
3577     * pixelX and pixelY should be in the coordinate system of layout
3578     */
3579    @Thunk int[] findNearestArea(int pixelX, int pixelY,
3580            int spanX, int spanY, CellLayout layout, int[] recycle) {
3581        return layout.findNearestArea(
3582                pixelX, pixelY, spanX, spanY, recycle);
3583    }
3584
3585    void setup(DragController dragController) {
3586        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3587        mDragController = dragController;
3588
3589        // hardware layers on children are enabled on startup, but should be disabled until
3590        // needed
3591        updateChildrenLayersEnabled(false);
3592    }
3593
3594    /**
3595     * Called at the end of a drag which originated on the workspace.
3596     */
3597    public void onDropCompleted(final View target, final DragObject d,
3598            final boolean isFlingToDelete, final boolean success) {
3599        if (mDeferDropAfterUninstall) {
3600            mDeferredAction = new Runnable() {
3601                public void run() {
3602                    onDropCompleted(target, d, isFlingToDelete, success);
3603                    mDeferredAction = null;
3604                }
3605            };
3606            return;
3607        }
3608
3609        boolean beingCalledAfterUninstall = mDeferredAction != null;
3610
3611        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3612            if (target != this && mDragInfo != null) {
3613                removeWorkspaceItem(mDragInfo.cell);
3614            }
3615        } else if (mDragInfo != null) {
3616            final CellLayout cellLayout = mLauncher.getCellLayout(
3617                    mDragInfo.container, mDragInfo.screenId);
3618            if (cellLayout != null) {
3619                cellLayout.onDropChild(mDragInfo.cell);
3620            } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3621                throw new RuntimeException("Invalid state: cellLayout == null in "
3622                        + "Workspace#onDropCompleted. Please file a bug. ");
3623            };
3624        }
3625        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3626                && mDragInfo.cell != null) {
3627            mDragInfo.cell.setVisibility(VISIBLE);
3628        }
3629
3630        if (!isFlingToDelete) {
3631            // Fling to delete already exits spring loaded mode after the animation finishes.
3632            mLauncher.exitSpringLoadedDragModeDelayed(success,
3633                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, mDelayedResizeRunnable);
3634            mDelayedResizeRunnable = null;
3635        }
3636    }
3637
3638    /**
3639     * For opposite operation. See {@link #addInScreen}.
3640     */
3641    public void removeWorkspaceItem(View v) {
3642        CellLayout parentCell = getParentCellLayoutForView(v);
3643        if (parentCell != null) {
3644            parentCell.removeView(v);
3645        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3646            // When an app is uninstalled using the drop target, we wait until resume to remove
3647            // the icon. We also remove all the corresponding items from the workspace at
3648            // {@link Launcher#bindComponentsRemoved}. That call can come before or after
3649            // {@link Launcher#mOnResumeCallbacks} depending on how busy the worker thread is.
3650            Log.e(TAG, "mDragInfo.cell has null parent");
3651        }
3652        if (v instanceof DropTarget) {
3653            mDragController.removeDropTarget((DropTarget) v);
3654        }
3655    }
3656
3657    /**
3658     * Removes all folder listeners
3659     */
3660    public void removeFolderListeners() {
3661        mapOverItems(false, new ItemOperator() {
3662            @Override
3663            public boolean evaluate(ItemInfo info, View view) {
3664                if (view instanceof FolderIcon) {
3665                    ((FolderIcon) view).removeListeners();
3666                }
3667                return false;
3668            }
3669        });
3670    }
3671
3672    @Override
3673    public void deferCompleteDropAfterUninstallActivity() {
3674        mDeferDropAfterUninstall = true;
3675    }
3676
3677    /// maybe move this into a smaller part
3678    @Override
3679    public void onDragObjectRemoved(boolean success) {
3680        mDeferDropAfterUninstall = false;
3681        mUninstallSuccessful = success;
3682        if (mDeferredAction != null) {
3683            mDeferredAction.run();
3684        }
3685    }
3686
3687    @Override
3688    public float getIntrinsicIconScaleFactor() {
3689        return 1f;
3690    }
3691
3692    @Override
3693    public boolean supportsFlingToDelete() {
3694        return true;
3695    }
3696
3697    @Override
3698    public boolean supportsAppInfoDropTarget() {
3699        return !FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND;
3700    }
3701
3702    @Override
3703    public boolean supportsDeleteDropTarget() {
3704        return true;
3705    }
3706
3707    @Override
3708    public void onFlingToDelete(DragObject d, PointF vec) {
3709        // Do nothing
3710    }
3711
3712    @Override
3713    public void onFlingToDeleteCompleted() {
3714        // Do nothing
3715    }
3716
3717    public boolean isDropEnabled() {
3718        return true;
3719    }
3720
3721    @Override
3722    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
3723        // We don't dispatch restoreInstanceState to our children using this code path.
3724        // Some pages will be restored immediately as their items are bound immediately, and
3725        // others we will need to wait until after their items are bound.
3726        mSavedStates = container;
3727    }
3728
3729    public void restoreInstanceStateForChild(int child) {
3730        if (mSavedStates != null) {
3731            mRestoredPages.add(child);
3732            CellLayout cl = (CellLayout) getChildAt(child);
3733            if (cl != null) {
3734                cl.restoreInstanceState(mSavedStates);
3735            }
3736        }
3737    }
3738
3739    public void restoreInstanceStateForRemainingPages() {
3740        int count = getChildCount();
3741        for (int i = 0; i < count; i++) {
3742            if (!mRestoredPages.contains(i)) {
3743                restoreInstanceStateForChild(i);
3744            }
3745        }
3746        mRestoredPages.clear();
3747        mSavedStates = null;
3748    }
3749
3750    @Override
3751    public void scrollLeft() {
3752        if (!workspaceInModalState() && !mIsSwitchingState) {
3753            super.scrollLeft();
3754        }
3755        Folder openFolder = Folder.getOpen(mLauncher);
3756        if (openFolder != null) {
3757            openFolder.completeDragExit();
3758        }
3759    }
3760
3761    @Override
3762    public void scrollRight() {
3763        if (!workspaceInModalState() && !mIsSwitchingState) {
3764            super.scrollRight();
3765        }
3766        Folder openFolder = Folder.getOpen(mLauncher);
3767        if (openFolder != null) {
3768            openFolder.completeDragExit();
3769        }
3770    }
3771
3772    @Override
3773    public boolean onEnterScrollArea(int x, int y, int direction) {
3774        // Ignore the scroll area if we are dragging over the hot seat
3775        boolean isPortrait = !mLauncher.getDeviceProfile().isLandscape;
3776        if (mLauncher.getHotseat() != null && isPortrait) {
3777            Rect r = new Rect();
3778            mLauncher.getHotseat().getHitRect(r);
3779            if (r.contains(x, y)) {
3780                return false;
3781            }
3782        }
3783
3784        boolean result = false;
3785        if (!workspaceInModalState() && !mIsSwitchingState && Folder.getOpen(mLauncher) == null) {
3786            mInScrollArea = true;
3787
3788            final int page = getNextPage() +
3789                       (direction == DragController.SCROLL_LEFT ? -1 : 1);
3790            // We always want to exit the current layout to ensure parity of enter / exit
3791            setCurrentDropLayout(null);
3792
3793            if (0 <= page && page < getChildCount()) {
3794                // Ensure that we are not dragging over to the custom content screen
3795                if (getScreenIdForPageIndex(page) == CUSTOM_CONTENT_SCREEN_ID) {
3796                    return false;
3797                }
3798
3799                CellLayout layout = (CellLayout) getChildAt(page);
3800                setCurrentDragOverlappingLayout(layout);
3801
3802                // Workspace is responsible for drawing the edge glow on adjacent pages,
3803                // so we need to redraw the workspace when this may have changed.
3804                invalidate();
3805                result = true;
3806            }
3807        }
3808        return result;
3809    }
3810
3811    @Override
3812    public boolean onExitScrollArea() {
3813        boolean result = false;
3814        if (mInScrollArea) {
3815            invalidate();
3816            CellLayout layout = getCurrentDropLayout();
3817            setCurrentDropLayout(layout);
3818            setCurrentDragOverlappingLayout(layout);
3819
3820            result = true;
3821            mInScrollArea = false;
3822        }
3823        return result;
3824    }
3825
3826    private void onResetScrollArea() {
3827        setCurrentDragOverlappingLayout(null);
3828        mInScrollArea = false;
3829    }
3830
3831    /**
3832     * Returns a specific CellLayout
3833     */
3834    CellLayout getParentCellLayoutForView(View v) {
3835        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
3836        for (CellLayout layout : layouts) {
3837            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
3838                return layout;
3839            }
3840        }
3841        return null;
3842    }
3843
3844    /**
3845     * Returns a list of all the CellLayouts in the workspace.
3846     */
3847    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
3848        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
3849        int screenCount = getChildCount();
3850        for (int screen = 0; screen < screenCount; screen++) {
3851            layouts.add(((CellLayout) getChildAt(screen)));
3852        }
3853        if (mLauncher.getHotseat() != null) {
3854            layouts.add(mLauncher.getHotseat().getLayout());
3855        }
3856        return layouts;
3857    }
3858
3859    /**
3860     * We should only use this to search for specific children.  Do not use this method to modify
3861     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
3862     * the hotseat and workspace pages
3863     */
3864    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
3865        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = new ArrayList<>();
3866        int screenCount = getChildCount();
3867        for (int screen = 0; screen < screenCount; screen++) {
3868            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
3869        }
3870        if (mLauncher.getHotseat() != null) {
3871            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
3872        }
3873        return childrenLayouts;
3874    }
3875
3876    public View getHomescreenIconByItemId(final long id) {
3877        return getFirstMatch(new ItemOperator() {
3878
3879            @Override
3880            public boolean evaluate(ItemInfo info, View v) {
3881                return info != null && info.id == id;
3882            }
3883        });
3884    }
3885
3886    public View getViewForTag(final Object tag) {
3887        return getFirstMatch(new ItemOperator() {
3888
3889            @Override
3890            public boolean evaluate(ItemInfo info, View v) {
3891                return info == tag;
3892            }
3893        });
3894    }
3895
3896    public LauncherAppWidgetHostView getWidgetForAppWidgetId(final int appWidgetId) {
3897        return (LauncherAppWidgetHostView) getFirstMatch(new ItemOperator() {
3898
3899            @Override
3900            public boolean evaluate(ItemInfo info, View v) {
3901                return (info instanceof LauncherAppWidgetInfo) &&
3902                        ((LauncherAppWidgetInfo) info).appWidgetId == appWidgetId;
3903            }
3904        });
3905    }
3906
3907    public View getFirstMatch(final ItemOperator operator) {
3908        final View[] value = new View[1];
3909        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3910            @Override
3911            public boolean evaluate(ItemInfo info, View v) {
3912                if (operator.evaluate(info, v)) {
3913                    value[0] = v;
3914                    return true;
3915                }
3916                return false;
3917            }
3918        });
3919        return value[0];
3920    }
3921
3922    void clearDropTargets() {
3923        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3924            @Override
3925            public boolean evaluate(ItemInfo info, View v) {
3926                if (v instanceof DropTarget) {
3927                    mDragController.removeDropTarget((DropTarget) v);
3928                }
3929                // not done, process all the shortcuts
3930                return false;
3931            }
3932        });
3933    }
3934
3935    /**
3936     * Removes items that match the {@param matcher}. When applications are removed
3937     * as a part of an update, this is called to ensure that other widgets and application
3938     * shortcuts are not removed.
3939     */
3940    public void removeItemsByMatcher(final ItemInfoMatcher matcher) {
3941        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
3942        for (final CellLayout layoutParent: cellLayouts) {
3943            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
3944
3945            LongArrayMap<View> idToViewMap = new LongArrayMap<>();
3946            ArrayList<ItemInfo> items = new ArrayList<>();
3947            for (int j = 0; j < layout.getChildCount(); j++) {
3948                final View view = layout.getChildAt(j);
3949                if (view.getTag() instanceof ItemInfo) {
3950                    ItemInfo item = (ItemInfo) view.getTag();
3951                    items.add(item);
3952                    idToViewMap.put(item.id, view);
3953                }
3954            }
3955
3956            for (ItemInfo itemToRemove : matcher.filterItemInfos(items)) {
3957                View child = idToViewMap.get(itemToRemove.id);
3958
3959                if (child != null) {
3960                    // Note: We can not remove the view directly from CellLayoutChildren as this
3961                    // does not re-mark the spaces as unoccupied.
3962                    layoutParent.removeViewInLayout(child);
3963                    if (child instanceof DropTarget) {
3964                        mDragController.removeDropTarget((DropTarget) child);
3965                    }
3966                } else if (itemToRemove.container >= 0) {
3967                    // The item may belong to a folder.
3968                    View parent = idToViewMap.get(itemToRemove.container);
3969                    if (parent != null) {
3970                        ((FolderInfo) parent.getTag()).remove((ShortcutInfo) itemToRemove, false);
3971                    }
3972                }
3973            }
3974        }
3975
3976        // Strip all the empty screens
3977        stripEmptyScreens();
3978    }
3979
3980    public interface ItemOperator {
3981        /**
3982         * Process the next itemInfo, possibly with side-effect on the next item.
3983         *
3984         * @param info info for the shortcut
3985         * @param view view for the shortcut
3986         * @return true if done, false to continue the map
3987         */
3988        public boolean evaluate(ItemInfo info, View view);
3989    }
3990
3991    /**
3992     * Map the operator over the shortcuts and widgets, return the first-non-null value.
3993     *
3994     * @param recurse true: iterate over folder children. false: op get the folders themselves.
3995     * @param op the operator to map over the shortcuts
3996     */
3997    void mapOverItems(boolean recurse, ItemOperator op) {
3998        ArrayList<ShortcutAndWidgetContainer> containers = getAllShortcutAndWidgetContainers();
3999        final int containerCount = containers.size();
4000        for (int containerIdx = 0; containerIdx < containerCount; containerIdx++) {
4001            ShortcutAndWidgetContainer container = containers.get(containerIdx);
4002            // map over all the shortcuts on the workspace
4003            final int itemCount = container.getChildCount();
4004            for (int itemIdx = 0; itemIdx < itemCount; itemIdx++) {
4005                View item = container.getChildAt(itemIdx);
4006                ItemInfo info = (ItemInfo) item.getTag();
4007                if (recurse && info instanceof FolderInfo && item instanceof FolderIcon) {
4008                    FolderIcon folder = (FolderIcon) item;
4009                    ArrayList<View> folderChildren = folder.getFolder().getItemsInReadingOrder();
4010                    // map over all the children in the folder
4011                    final int childCount = folderChildren.size();
4012                    for (int childIdx = 0; childIdx < childCount; childIdx++) {
4013                        View child = folderChildren.get(childIdx);
4014                        info = (ItemInfo) child.getTag();
4015                        if (op.evaluate(info, child)) {
4016                            return;
4017                        }
4018                    }
4019                } else {
4020                    if (op.evaluate(info, item)) {
4021                        return;
4022                    }
4023                }
4024            }
4025        }
4026    }
4027
4028    void updateShortcuts(ArrayList<ShortcutInfo> shortcuts) {
4029        int total  = shortcuts.size();
4030        final HashSet<ShortcutInfo> updates = new HashSet<ShortcutInfo>(total);
4031        final HashSet<Long> folderIds = new HashSet<>();
4032
4033        for (int i = 0; i < total; i++) {
4034            ShortcutInfo s = shortcuts.get(i);
4035            updates.add(s);
4036            folderIds.add(s.container);
4037        }
4038
4039        mapOverItems(MAP_RECURSE, new ItemOperator() {
4040            @Override
4041            public boolean evaluate(ItemInfo info, View v) {
4042                if (info instanceof ShortcutInfo && v instanceof BubbleTextView &&
4043                        updates.contains(info)) {
4044                    ShortcutInfo si = (ShortcutInfo) info;
4045                    BubbleTextView shortcut = (BubbleTextView) v;
4046                    Drawable oldIcon = getTextViewIcon(shortcut);
4047                    boolean oldPromiseState = (oldIcon instanceof PreloadIconDrawable)
4048                            && ((PreloadIconDrawable) oldIcon).hasNotCompleted();
4049                    shortcut.applyFromShortcutInfo(si, mIconCache,
4050                            si.isPromise() != oldPromiseState);
4051                }
4052                // process all the shortcuts
4053                return false;
4054            }
4055        });
4056
4057        // Update folder icons
4058        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4059            @Override
4060            public boolean evaluate(ItemInfo info, View v) {
4061                if (info instanceof FolderInfo && folderIds.contains(info.id)) {
4062                    ((FolderInfo) info).itemsChanged(false);
4063                }
4064                // process all the shortcuts
4065                return false;
4066            }
4067        });
4068    }
4069
4070    public void removeAbandonedPromise(String packageName, UserHandleCompat user) {
4071        HashSet<String> packages = new HashSet<>(1);
4072        packages.add(packageName);
4073        ItemInfoMatcher matcher = ItemInfoMatcher.ofPackages(packages, user);
4074        LauncherModel.deleteItemsFromDatabase(mLauncher, matcher);
4075        removeItemsByMatcher(matcher);
4076    }
4077
4078    public void updateRestoreItems(final HashSet<ItemInfo> updates) {
4079        mapOverItems(MAP_RECURSE, new ItemOperator() {
4080            @Override
4081            public boolean evaluate(ItemInfo info, View v) {
4082                if (info instanceof ShortcutInfo && v instanceof BubbleTextView
4083                        && updates.contains(info)) {
4084                    ((BubbleTextView) v).applyState(false);
4085                } else if (v instanceof PendingAppWidgetHostView
4086                        && info instanceof LauncherAppWidgetInfo
4087                        && updates.contains(info)) {
4088                    ((PendingAppWidgetHostView) v).applyState();
4089                }
4090                // process all the shortcuts
4091                return false;
4092            }
4093        });
4094    }
4095
4096    public void widgetsRestored(final ArrayList<LauncherAppWidgetInfo> changedInfo) {
4097        if (!changedInfo.isEmpty()) {
4098            DeferredWidgetRefresh widgetRefresh = new DeferredWidgetRefresh(changedInfo,
4099                    mLauncher.getAppWidgetHost());
4100
4101            LauncherAppWidgetInfo item = changedInfo.get(0);
4102            final AppWidgetProviderInfo widgetInfo;
4103            if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_NOT_VALID)) {
4104                widgetInfo = AppWidgetManagerCompat
4105                        .getInstance(mLauncher).findProvider(item.providerName, item.user);
4106            } else {
4107                widgetInfo = AppWidgetManagerCompat.getInstance(mLauncher)
4108                        .getAppWidgetInfo(item.appWidgetId);
4109            }
4110
4111            if (widgetInfo != null) {
4112                // Re-inflate the widgets which have changed status
4113                widgetRefresh.run();
4114            } else {
4115                // widgetRefresh will automatically run when the packages are updated.
4116                // For now just update the progress bars
4117                mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4118                    @Override
4119                    public boolean evaluate(ItemInfo info, View view) {
4120                        if (view instanceof PendingAppWidgetHostView
4121                                && changedInfo.contains(info)) {
4122                            ((LauncherAppWidgetInfo) info).installProgress = 100;
4123                            ((PendingAppWidgetHostView) view).applyState();
4124                        }
4125                        // process all the shortcuts
4126                        return false;
4127                    }
4128                });
4129            }
4130        }
4131    }
4132
4133    private void moveToScreen(int page, boolean animate) {
4134        if (!workspaceInModalState()) {
4135            if (animate) {
4136                snapToPage(page);
4137            } else {
4138                setCurrentPage(page);
4139            }
4140        }
4141        View child = getChildAt(page);
4142        if (child != null) {
4143            child.requestFocus();
4144        }
4145    }
4146
4147    void moveToDefaultScreen(boolean animate) {
4148        moveToScreen(getDefaultPage(), animate);
4149    }
4150
4151    void moveToCustomContentScreen(boolean animate) {
4152        if (hasCustomContent()) {
4153            int ccIndex = getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID);
4154            if (animate) {
4155                snapToPage(ccIndex);
4156            } else {
4157                setCurrentPage(ccIndex);
4158            }
4159            View child = getChildAt(ccIndex);
4160            if (child != null) {
4161                child.requestFocus();
4162            }
4163         }
4164        exitWidgetResizeMode();
4165    }
4166
4167    @Override
4168    protected String getPageIndicatorDescription() {
4169        return getResources().getString(R.string.all_apps_button_label);
4170    }
4171
4172    @Override
4173    protected String getCurrentPageDescription() {
4174        if (hasCustomContent() && getNextPage() == 0) {
4175            return mCustomContentDescription;
4176        }
4177        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4178        return getPageDescription(page);
4179    }
4180
4181    private String getPageDescription(int page) {
4182        int delta = numCustomPages();
4183        int nScreens = getChildCount() - delta;
4184        int extraScreenId = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
4185        if (extraScreenId >= 0 && nScreens > 1) {
4186            if (page == extraScreenId) {
4187                return getContext().getString(R.string.workspace_new_page);
4188            }
4189            nScreens--;
4190        }
4191        if (nScreens == 0) {
4192            // When the workspace is not loaded, we do not know how many screen will be bound.
4193            return getContext().getString(R.string.all_apps_home_button_label);
4194        }
4195        return getContext().getString(R.string.workspace_scroll_format,
4196                page + 1 - delta, nScreens);
4197    }
4198
4199    @Override
4200    public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
4201        target.gridX = info.cellX;
4202        target.gridY = info.cellY;
4203        target.pageIndex = getCurrentPage();
4204        targetParent.containerType = LauncherLogProto.WORKSPACE;
4205        if (info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
4206            target.rank = info.rank;
4207            targetParent.containerType = LauncherLogProto.HOTSEAT;
4208        } else if (info.container >= 0) {
4209            targetParent.containerType = LauncherLogProto.FOLDER;
4210        }
4211    }
4212
4213    /**
4214     * Used as a workaround to ensure that the AppWidgetService receives the
4215     * PACKAGE_ADDED broadcast before updating widgets.
4216     */
4217    private class DeferredWidgetRefresh implements Runnable {
4218        private final ArrayList<LauncherAppWidgetInfo> mInfos;
4219        private final LauncherAppWidgetHost mHost;
4220        private final Handler mHandler;
4221
4222        private boolean mRefreshPending;
4223
4224        public DeferredWidgetRefresh(ArrayList<LauncherAppWidgetInfo> infos,
4225                LauncherAppWidgetHost host) {
4226            mInfos = infos;
4227            mHost = host;
4228            mHandler = new Handler();
4229            mRefreshPending = true;
4230
4231            mHost.addProviderChangeListener(this);
4232            // Force refresh after 10 seconds, if we don't get the provider changed event.
4233            // This could happen when the provider is no longer available in the app.
4234            mHandler.postDelayed(this, 10000);
4235        }
4236
4237        @Override
4238        public void run() {
4239            mHost.removeProviderChangeListener(this);
4240            mHandler.removeCallbacks(this);
4241
4242            if (!mRefreshPending) {
4243                return;
4244            }
4245
4246            mRefreshPending = false;
4247
4248            mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4249                @Override
4250                public boolean evaluate(ItemInfo info, View view) {
4251                    if (view instanceof PendingAppWidgetHostView && mInfos.contains(info)) {
4252                        mLauncher.removeItem(view, info, false /* deleteFromDb */);
4253                        mLauncher.bindAppWidget((LauncherAppWidgetInfo) info);
4254                    }
4255                    // process all the shortcuts
4256                    return false;
4257                }
4258            });
4259        }
4260    }
4261
4262    public interface OnStateChangeListener {
4263
4264        /**
4265         * Called when the workspace state is changing.
4266         * @param toState final state
4267         * @param targetAnim animation which will be played during the transition or null.
4268         */
4269        void prepareStateChange(State toState, AnimatorSet targetAnim);
4270    }
4271
4272    public static final boolean isQsbContainerPage(int pageNo) {
4273        return pageNo == 0;
4274    }
4275}
4276