Workspace.java revision ee68816be8e4667548ac8925a14d014f1d66d460 
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.LayoutTransition;
22import android.animation.ObjectAnimator;
23import android.animation.PropertyValuesHolder;
24import android.annotation.SuppressLint;
25import android.annotation.TargetApi;
26import android.app.WallpaperManager;
27import android.appwidget.AppWidgetHostView;
28import android.appwidget.AppWidgetProviderInfo;
29import android.content.ComponentName;
30import android.content.Context;
31import android.content.res.Resources;
32import android.graphics.Bitmap;
33import android.graphics.Canvas;
34import android.graphics.Matrix;
35import android.graphics.Paint;
36import android.graphics.Point;
37import android.graphics.PointF;
38import android.graphics.Rect;
39import android.graphics.Region.Op;
40import android.graphics.drawable.Drawable;
41import android.os.AsyncTask;
42import android.os.Build;
43import android.os.Bundle;
44import android.os.Handler;
45import android.os.IBinder;
46import android.os.Parcelable;
47import android.util.AttributeSet;
48import android.util.Log;
49import android.util.SparseArray;
50import android.view.MotionEvent;
51import android.view.View;
52import android.view.ViewDebug;
53import android.view.ViewGroup;
54import android.view.accessibility.AccessibilityManager;
55import android.view.animation.AccelerateInterpolator;
56import android.view.animation.DecelerateInterpolator;
57import android.view.animation.Interpolator;
58import android.widget.TextView;
59
60import com.android.launcher3.folder.Folder;
61import com.android.launcher3.folder.FolderIcon;
62import com.android.launcher3.folder.FolderIcon.FolderRingAnimator;
63import com.android.launcher3.Launcher.CustomContentCallbacks;
64import com.android.launcher3.Launcher.LauncherOverlay;
65import com.android.launcher3.UninstallDropTarget.UninstallSource;
66import com.android.launcher3.accessibility.LauncherAccessibilityDelegate;
67import com.android.launcher3.accessibility.LauncherAccessibilityDelegate.AccessibilityDragSource;
68import com.android.launcher3.accessibility.OverviewScreenAccessibilityDelegate;
69import com.android.launcher3.accessibility.WorkspaceAccessibilityHelper;
70import com.android.launcher3.compat.UserHandleCompat;
71import com.android.launcher3.config.FeatureFlags;
72import com.android.launcher3.config.ProviderConfig;
73import com.android.launcher3.dragndrop.DragController;
74import com.android.launcher3.dragndrop.DragLayer;
75import com.android.launcher3.dragndrop.DragScroller;
76import com.android.launcher3.dragndrop.DragView;
77import com.android.launcher3.dragndrop.SpringLoadedDragController;
78import com.android.launcher3.util.LongArrayMap;
79import com.android.launcher3.util.Thunk;
80import com.android.launcher3.util.WallpaperOffsetInterpolator;
81import com.android.launcher3.widget.PendingAddShortcutInfo;
82import com.android.launcher3.widget.PendingAddWidgetInfo;
83import com.android.wallpaperpicker.WallpaperUtils;
84
85import java.util.ArrayList;
86import java.util.HashMap;
87import java.util.HashSet;
88import java.util.concurrent.atomic.AtomicInteger;
89
90/**
91 * The workspace is a wide area with a wallpaper and a finite number of pages.
92 * Each page contains a number of icons, folders or widgets the user can
93 * interact with. A workspace is meant to be used with a fixed width only.
94 */
95public class Workspace extends PagedView
96        implements DropTarget, DragSource, DragScroller, View.OnTouchListener,
97        DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener,
98        Insettable, UninstallSource, AccessibilityDragSource, Stats.LaunchSourceProvider {
99    private static final String TAG = "Launcher.Workspace";
100
101    private static boolean ENFORCE_DRAG_EVENT_ORDER = false;
102
103    private static final int SNAP_OFF_EMPTY_SCREEN_DURATION = 400;
104    private static final int FADE_EMPTY_SCREEN_DURATION = 150;
105
106    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
107
108    private static final boolean MAP_NO_RECURSE = false;
109    private static final boolean MAP_RECURSE = true;
110
111    // The screen id used for the empty screen always present to the right.
112    public final static long EXTRA_EMPTY_SCREEN_ID = -201;
113    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
114
115    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
116    private long mTouchDownTime = -1;
117    private long mCustomContentShowTime = -1;
118
119    private LayoutTransition mLayoutTransition;
120    @Thunk final WallpaperManager mWallpaperManager;
121
122    private ShortcutAndWidgetContainer mDragSourceInternal;
123
124    @Thunk LongArrayMap<CellLayout> mWorkspaceScreens = new LongArrayMap<>();
125    @Thunk ArrayList<Long> mScreenOrder = new ArrayList<Long>();
126
127    @Thunk Runnable mRemoveEmptyScreenRunnable;
128    @Thunk boolean mDeferRemoveExtraEmptyScreen = false;
129    @Thunk boolean mAddNewPageOnDrag = true;
130
131    /**
132     * CellInfo for the cell that is currently being dragged
133     */
134    private CellLayout.CellInfo mDragInfo;
135
136    /**
137     * Target drop area calculated during last acceptDrop call.
138     */
139    @Thunk int[] mTargetCell = new int[2];
140    private int mDragOverX = -1;
141    private int mDragOverY = -1;
142
143    CustomContentCallbacks mCustomContentCallbacks;
144    boolean mCustomContentShowing;
145    private float mLastCustomContentScrollProgress = -1f;
146    private String mCustomContentDescription = "";
147
148    /**
149     * The CellLayout that is currently being dragged over
150     */
151    @Thunk CellLayout mDragTargetLayout = null;
152    /**
153     * The CellLayout that we will show as glowing
154     */
155    private CellLayout mDragOverlappingLayout = null;
156
157    /**
158     * The CellLayout which will be dropped to
159     */
160    private CellLayout mDropToLayout = null;
161
162    @Thunk Launcher mLauncher;
163    @Thunk IconCache mIconCache;
164    @Thunk DragController mDragController;
165
166    // These are temporary variables to prevent having to allocate a new object just to
167    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
168    private static final Rect sTempRect = new Rect();
169    private final int[] mTempXY = new int[2];
170    @Thunk float[] mDragViewVisualCenter = new float[2];
171    private float[] mTempCellLayoutCenterCoordinates = new float[2];
172    private int[] mTempVisiblePagesRange = new int[2];
173    private Matrix mTempMatrix = new Matrix();
174
175    private SpringLoadedDragController mSpringLoadedDragController;
176    private float mSpringLoadedShrinkFactor;
177    private float mOverviewModeShrinkFactor;
178
179    // State variable that indicates whether the pages are small (ie when you're
180    // in all apps or customize mode)
181
182    enum State {
183        NORMAL          (SearchDropTargetBar.State.SEARCH_BAR),
184        NORMAL_HIDDEN   (SearchDropTargetBar.State.INVISIBLE_TRANSLATED),
185        SPRING_LOADED   (SearchDropTargetBar.State.DROP_TARGET),
186        OVERVIEW        (SearchDropTargetBar.State.INVISIBLE),
187        OVERVIEW_HIDDEN (SearchDropTargetBar.State.INVISIBLE);
188
189        private final SearchDropTargetBar.State mBarState;
190
191        State(SearchDropTargetBar.State searchBarState) {
192            mBarState = searchBarState;
193        }
194
195        public SearchDropTargetBar.State getSearchDropTargetBarState() {
196            return mBarState;
197        }
198    };
199
200    @ViewDebug.ExportedProperty(category = "launcher")
201    private State mState = State.NORMAL;
202    private boolean mIsSwitchingState = false;
203
204    boolean mAnimatingViewIntoPlace = false;
205    boolean mChildrenLayersEnabled = true;
206
207    private boolean mStripScreensOnPageStopMoving = false;
208
209    /** Is the user is dragging an item near the edge of a page? */
210    private boolean mInScrollArea = false;
211
212    private HolographicOutlineHelper mOutlineHelper;
213    @Thunk Bitmap mDragOutline = null;
214    public static final int DRAG_BITMAP_PADDING = 2;
215    private boolean mWorkspaceFadeInAdjacentScreens;
216
217    final WallpaperOffsetInterpolator mWallpaperOffset;
218
219    @Thunk Runnable mDelayedResizeRunnable;
220    private Runnable mDelayedSnapToPageRunnable;
221
222    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
223    private static final int FOLDER_CREATION_TIMEOUT = 0;
224    public static final int REORDER_TIMEOUT = 350;
225    private final Alarm mFolderCreationAlarm = new Alarm();
226    private final Alarm mReorderAlarm = new Alarm();
227    @Thunk FolderRingAnimator mDragFolderRingAnimator = null;
228    private FolderIcon mDragOverFolderIcon = null;
229    private boolean mCreateUserFolderOnDrop = false;
230    private boolean mAddToExistingFolderOnDrop = false;
231    private float mMaxDistanceForFolderCreation;
232
233    private final Canvas mCanvas = new Canvas();
234
235    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
236    private float mXDown;
237    private float mYDown;
238    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
239    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
240    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
241
242    // Relating to the animation of items being dropped externally
243    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
244    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
245    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
246    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
247    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
248
249    // Related to dragging, folder creation and reordering
250    private static final int DRAG_MODE_NONE = 0;
251    private static final int DRAG_MODE_CREATE_FOLDER = 1;
252    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
253    private static final int DRAG_MODE_REORDER = 3;
254    private int mDragMode = DRAG_MODE_NONE;
255    @Thunk int mLastReorderX = -1;
256    @Thunk int mLastReorderY = -1;
257
258    private SparseArray<Parcelable> mSavedStates;
259    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
260
261    private float mCurrentScale;
262    private float mTransitionProgress;
263
264    @Thunk Runnable mDeferredAction;
265    private boolean mDeferDropAfterUninstall;
266    private boolean mUninstallSuccessful;
267
268    // State related to Launcher Overlay
269    LauncherOverlay mLauncherOverlay;
270    boolean mScrollInteractionBegan;
271    boolean mStartedSendingScrollEvents;
272    float mLastOverlaySroll = 0;
273    // Total over scrollX in the overlay direction.
274    private int mUnboundedScrollX;
275    private boolean mForceDrawAdjacentPages = false;
276    // Total over scrollX in the overlay direction.
277    private float mOverlayTranslation;
278
279    // Handles workspace state transitions
280    private WorkspaceStateTransitionAnimation mStateTransitionAnimation;
281
282    private AccessibilityDelegate mPagesAccessibilityDelegate;
283
284    /**
285     * Used to inflate the Workspace from XML.
286     *
287     * @param context The application's context.
288     * @param attrs The attributes set containing the Workspace's customization values.
289     */
290    public Workspace(Context context, AttributeSet attrs) {
291        this(context, attrs, 0);
292    }
293
294    /**
295     * Used to inflate the Workspace from XML.
296     *
297     * @param context The application's context.
298     * @param attrs The attributes set containing the Workspace's customization values.
299     * @param defStyle Unused.
300     */
301    public Workspace(Context context, AttributeSet attrs, int defStyle) {
302        super(context, attrs, defStyle);
303
304        mOutlineHelper = HolographicOutlineHelper.obtain(context);
305
306        mLauncher = (Launcher) context;
307        mStateTransitionAnimation = new WorkspaceStateTransitionAnimation(mLauncher, this);
308        final Resources res = getResources();
309        DeviceProfile grid = mLauncher.getDeviceProfile();
310        mWorkspaceFadeInAdjacentScreens = grid.shouldFadeAdjacentWorkspaceScreens();
311        mFadeInAdjacentScreens = false;
312        mWallpaperManager = WallpaperManager.getInstance(context);
313
314        mWallpaperOffset = new WallpaperOffsetInterpolator(this);
315
316        mSpringLoadedShrinkFactor =
317                res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f;
318        mOverviewModeShrinkFactor =
319                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100f;
320
321        setOnHierarchyChangeListener(this);
322        setHapticFeedbackEnabled(false);
323
324        initWorkspace();
325
326        // Disable multitouch across the workspace/all apps/customize tray
327        setMotionEventSplittingEnabled(true);
328    }
329
330    @Override
331    public void setInsets(Rect insets) {
332        mInsets.set(insets);
333
334        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
335        if (customScreen != null) {
336            View customContent = customScreen.getShortcutsAndWidgets().getChildAt(0);
337            if (customContent instanceof Insettable) {
338                ((Insettable) customContent).setInsets(mInsets);
339            }
340        }
341    }
342
343    // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each
344    // dimension if unsuccessful
345    public int[] estimateItemSize(ItemInfo itemInfo, boolean springLoaded) {
346        int[] size = new int[2];
347        if (getChildCount() > 0) {
348            // Use the first non-custom page to estimate the child position
349            CellLayout cl = (CellLayout) getChildAt(numCustomPages());
350            Rect r = estimateItemPosition(cl, 0, 0, itemInfo.spanX, itemInfo.spanY);
351            size[0] = r.width();
352            size[1] = r.height();
353            if (springLoaded) {
354                size[0] *= mSpringLoadedShrinkFactor;
355                size[1] *= mSpringLoadedShrinkFactor;
356            }
357            return size;
358        } else {
359            size[0] = Integer.MAX_VALUE;
360            size[1] = Integer.MAX_VALUE;
361            return size;
362        }
363    }
364
365    public Rect estimateItemPosition(CellLayout cl, int hCell, int vCell, int hSpan, int vSpan) {
366        Rect r = new Rect();
367        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
368        return r;
369    }
370
371    @Override
372    public void onDragStart(final DragSource source, ItemInfo info, int dragAction) {
373        if (ENFORCE_DRAG_EVENT_ORDER) {
374            enfoceDragParity("onDragStart", 0, 0);
375        }
376
377        updateChildrenLayersEnabled(false);
378        mLauncher.lockScreenOrientation();
379        mLauncher.onInteractionBegin();
380        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
381        InstallShortcutReceiver.enableInstallQueue();
382
383        if (mAddNewPageOnDrag) {
384            mDeferRemoveExtraEmptyScreen = false;
385            addExtraEmptyScreenOnDrag();
386        }
387    }
388
389    public void setAddNewPageOnDrag(boolean addPage) {
390        mAddNewPageOnDrag = addPage;
391    }
392
393    public void deferRemoveExtraEmptyScreen() {
394        mDeferRemoveExtraEmptyScreen = true;
395    }
396
397    @Override
398    public void onDragEnd() {
399        if (ENFORCE_DRAG_EVENT_ORDER) {
400            enfoceDragParity("onDragEnd", 0, 0);
401        }
402
403        if (!mDeferRemoveExtraEmptyScreen) {
404            removeExtraEmptyScreen(true, mDragSourceInternal != null);
405        }
406
407        updateChildrenLayersEnabled(false);
408        mLauncher.unlockScreenOrientation(false);
409
410        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
411        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
412
413        mDragSourceInternal = null;
414        mLauncher.onInteractionEnd();
415    }
416
417    /**
418     * Initializes various states for this workspace.
419     */
420    protected void initWorkspace() {
421        mCurrentPage = getDefaultPage();
422        LauncherAppState app = LauncherAppState.getInstance();
423        DeviceProfile grid = mLauncher.getDeviceProfile();
424        mIconCache = app.getIconCache();
425        setWillNotDraw(false);
426        setClipChildren(false);
427        setClipToPadding(false);
428        setChildrenDrawnWithCacheEnabled(true);
429
430        setMinScale(mOverviewModeShrinkFactor);
431        setupLayoutTransition();
432
433        mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
434
435        // Set the wallpaper dimensions when Launcher starts up
436        setWallpaperDimension();
437
438        setEdgeGlowColor(getResources().getColor(R.color.workspace_edge_effect_color));
439    }
440
441    private int getDefaultPage() {
442        return numCustomPages();
443    }
444
445    private void setupLayoutTransition() {
446        // We want to show layout transitions when pages are deleted, to close the gap.
447        mLayoutTransition = new LayoutTransition();
448        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
449        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
450        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
451        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
452        setLayoutTransition(mLayoutTransition);
453    }
454
455    void enableLayoutTransitions() {
456        setLayoutTransition(mLayoutTransition);
457    }
458    void disableLayoutTransitions() {
459        setLayoutTransition(null);
460    }
461
462    @Override
463    public void onChildViewAdded(View parent, View child) {
464        if (!(child instanceof CellLayout)) {
465            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
466        }
467        CellLayout cl = ((CellLayout) child);
468        cl.setOnInterceptTouchListener(this);
469        cl.setClickable(true);
470        cl.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
471        super.onChildViewAdded(parent, child);
472    }
473
474    protected boolean shouldDrawChild(View child) {
475        final CellLayout cl = (CellLayout) child;
476        return super.shouldDrawChild(child) &&
477            (mIsSwitchingState ||
478             cl.getShortcutsAndWidgets().getAlpha() > 0 ||
479             cl.getBackgroundAlpha() > 0);
480    }
481
482    /**
483     * @return The open folder on the current screen, or null if there is none
484     */
485    public Folder getOpenFolder() {
486        DragLayer dragLayer = mLauncher.getDragLayer();
487        int count = dragLayer.getChildCount();
488        for (int i = 0; i < count; i++) {
489            View child = dragLayer.getChildAt(i);
490            if (child instanceof Folder) {
491                Folder folder = (Folder) child;
492                if (folder.getInfo().opened)
493                    return folder;
494            }
495        }
496        return null;
497    }
498
499    boolean isTouchActive() {
500        return mTouchState != TOUCH_STATE_REST;
501    }
502
503    public void removeAllWorkspaceScreens() {
504        // Disable all layout transitions before removing all pages to ensure that we don't get the
505        // transition animations competing with us changing the scroll when we add pages or the
506        // custom content screen
507        disableLayoutTransitions();
508
509        // Since we increment the current page when we call addCustomContentPage via bindScreens
510        // (and other places), we need to adjust the current page back when we clear the pages
511        if (hasCustomContent()) {
512            removeCustomContentPage();
513        }
514
515        // Remove the pages and clear the screen models
516        removeAllViews();
517        mScreenOrder.clear();
518        mWorkspaceScreens.clear();
519
520        // Re-enable the layout transitions
521        enableLayoutTransitions();
522    }
523
524    public long insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {
525        // Find the index to insert this view into.  If the empty screen exists, then
526        // insert it before that.
527        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
528        if (insertIndex < 0) {
529            insertIndex = mScreenOrder.size();
530        }
531        return insertNewWorkspaceScreen(screenId, insertIndex);
532    }
533
534    public long insertNewWorkspaceScreen(long screenId) {
535        return insertNewWorkspaceScreen(screenId, getChildCount());
536    }
537
538    public long insertNewWorkspaceScreen(long screenId, int insertIndex) {
539        if (mWorkspaceScreens.containsKey(screenId)) {
540            throw new RuntimeException("Screen id " + screenId + " already exists!");
541        }
542
543        // Inflate the cell layout, but do not add it automatically so that we can get the newly
544        // created CellLayout.
545        CellLayout newScreen = (CellLayout) mLauncher.getLayoutInflater().inflate(
546                        R.layout.workspace_screen, this, false /* attachToRoot */);
547
548        newScreen.setOnLongClickListener(mLongClickListener);
549        newScreen.setOnClickListener(mLauncher);
550        newScreen.setSoundEffectsEnabled(false);
551        mWorkspaceScreens.put(screenId, newScreen);
552        mScreenOrder.add(insertIndex, screenId);
553        addView(newScreen, insertIndex);
554
555        LauncherAccessibilityDelegate delegate =
556                LauncherAppState.getInstance().getAccessibilityDelegate();
557        if (delegate != null && delegate.isInAccessibleDrag()) {
558            newScreen.enableAccessibleDrag(true, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
559        }
560        return screenId;
561    }
562
563    public void createCustomContentContainer() {
564        CellLayout customScreen = (CellLayout)
565                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false);
566        customScreen.disableDragTarget();
567        customScreen.disableJailContent();
568
569        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
570        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
571
572        // We want no padding on the custom content
573        customScreen.setPadding(0, 0, 0, 0);
574
575        addFullScreenPage(customScreen);
576
577        // Update the custom content hint
578        if (mRestorePage != INVALID_RESTORE_PAGE) {
579            mRestorePage = mRestorePage + 1;
580        } else {
581            setCurrentPage(getCurrentPage() + 1);
582        }
583    }
584
585    public void removeCustomContentPage() {
586        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
587        if (customScreen == null) {
588            throw new RuntimeException("Expected custom content screen to exist");
589        }
590
591        mWorkspaceScreens.remove(CUSTOM_CONTENT_SCREEN_ID);
592        mScreenOrder.remove(CUSTOM_CONTENT_SCREEN_ID);
593        removeView(customScreen);
594
595        if (mCustomContentCallbacks != null) {
596            mCustomContentCallbacks.onScrollProgressChanged(0);
597            mCustomContentCallbacks.onHide();
598        }
599
600        mCustomContentCallbacks = null;
601
602        // Update the custom content hint
603        if (mRestorePage != INVALID_RESTORE_PAGE) {
604            mRestorePage = mRestorePage - 1;
605        } else {
606            setCurrentPage(getCurrentPage() - 1);
607        }
608    }
609
610    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks,
611            String description) {
612        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
613            throw new RuntimeException("Expected custom content screen to exist");
614        }
615
616        // Add the custom content to the full screen custom page
617        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
618        int spanX = customScreen.getCountX();
619        int spanY = customScreen.getCountY();
620        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
621        lp.canReorder  = false;
622        lp.isFullscreen = true;
623        if (customContent instanceof Insettable) {
624            ((Insettable)customContent).setInsets(mInsets);
625        }
626
627        // Verify that the child is removed from any existing parent.
628        if (customContent.getParent() instanceof ViewGroup) {
629            ViewGroup parent = (ViewGroup) customContent.getParent();
630            parent.removeView(customContent);
631        }
632        customScreen.removeAllViews();
633        customContent.setFocusable(true);
634        customContent.setOnKeyListener(new FullscreenKeyEventListener());
635        customContent.setOnFocusChangeListener(mLauncher.mFocusHandler
636                .getHideIndicatorOnFocusListener());
637        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
638        mCustomContentDescription = description;
639
640        mCustomContentCallbacks = callbacks;
641    }
642
643    public void addExtraEmptyScreenOnDrag() {
644        boolean lastChildOnScreen = false;
645        boolean childOnFinalScreen = false;
646
647        // Cancel any pending removal of empty screen
648        mRemoveEmptyScreenRunnable = null;
649
650        if (mDragSourceInternal != null) {
651            if (mDragSourceInternal.getChildCount() == 1) {
652                lastChildOnScreen = true;
653            }
654            CellLayout cl = (CellLayout) mDragSourceInternal.getParent();
655            if (indexOfChild(cl) == getChildCount() - 1) {
656                childOnFinalScreen = true;
657            }
658        }
659
660        // If this is the last item on the final screen
661        if (lastChildOnScreen && childOnFinalScreen) {
662            return;
663        }
664        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
665            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
666        }
667    }
668
669    public boolean addExtraEmptyScreen() {
670        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
671            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
672            return true;
673        }
674        return false;
675    }
676
677    private void convertFinalScreenToEmptyScreenIfNecessary() {
678        if (mLauncher.isWorkspaceLoading()) {
679            // Invalid and dangerous operation if workspace is loading
680            return;
681        }
682
683        if (hasExtraEmptyScreen() || mScreenOrder.size() == 0) return;
684        long finalScreenId = mScreenOrder.get(mScreenOrder.size() - 1);
685
686        if (finalScreenId == CUSTOM_CONTENT_SCREEN_ID) return;
687        CellLayout finalScreen = mWorkspaceScreens.get(finalScreenId);
688
689        // If the final screen is empty, convert it to the extra empty screen
690        if (finalScreen.getShortcutsAndWidgets().getChildCount() == 0 &&
691                !finalScreen.isDropPending()) {
692            mWorkspaceScreens.remove(finalScreenId);
693            mScreenOrder.remove(finalScreenId);
694
695            // if this is the last non-custom content screen, convert it to the empty screen
696            mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, finalScreen);
697            mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
698
699            // Update the model if we have changed any screens
700            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
701        }
702    }
703
704    public void removeExtraEmptyScreen(final boolean animate, boolean stripEmptyScreens) {
705        removeExtraEmptyScreenDelayed(animate, null, 0, stripEmptyScreens);
706    }
707
708    public void removeExtraEmptyScreenDelayed(final boolean animate, final Runnable onComplete,
709            final int delay, final boolean stripEmptyScreens) {
710        if (mLauncher.isWorkspaceLoading()) {
711            // Don't strip empty screens if the workspace is still loading
712            return;
713        }
714
715        if (delay > 0) {
716            postDelayed(new Runnable() {
717                @Override
718                public void run() {
719                    removeExtraEmptyScreenDelayed(animate, onComplete, 0, stripEmptyScreens);
720                }
721            }, delay);
722            return;
723        }
724
725        convertFinalScreenToEmptyScreenIfNecessary();
726        if (hasExtraEmptyScreen()) {
727            int emptyIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
728            if (getNextPage() == emptyIndex) {
729                snapToPage(getNextPage() - 1, SNAP_OFF_EMPTY_SCREEN_DURATION);
730                fadeAndRemoveEmptyScreen(SNAP_OFF_EMPTY_SCREEN_DURATION, FADE_EMPTY_SCREEN_DURATION,
731                        onComplete, stripEmptyScreens);
732            } else {
733                snapToPage(getNextPage(), 0);
734                fadeAndRemoveEmptyScreen(0, FADE_EMPTY_SCREEN_DURATION,
735                        onComplete, stripEmptyScreens);
736            }
737            return;
738        } else if (stripEmptyScreens) {
739            // If we're not going to strip the empty screens after removing
740            // the extra empty screen, do it right away.
741            stripEmptyScreens();
742        }
743
744        if (onComplete != null) {
745            onComplete.run();
746        }
747    }
748
749    private void fadeAndRemoveEmptyScreen(int delay, int duration, final Runnable onComplete,
750            final boolean stripEmptyScreens) {
751        // XXX: Do we need to update LM workspace screens below?
752        PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha", 0f);
753        PropertyValuesHolder bgAlpha = PropertyValuesHolder.ofFloat("backgroundAlpha", 0f);
754
755        final CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
756
757        mRemoveEmptyScreenRunnable = new Runnable() {
758            @Override
759            public void run() {
760                if (hasExtraEmptyScreen()) {
761                    mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
762                    mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
763                    removeView(cl);
764                    if (stripEmptyScreens) {
765                        stripEmptyScreens();
766                    }
767                }
768            }
769        };
770
771        ObjectAnimator oa = ObjectAnimator.ofPropertyValuesHolder(cl, alpha, bgAlpha);
772        oa.setDuration(duration);
773        oa.setStartDelay(delay);
774        oa.addListener(new AnimatorListenerAdapter() {
775            @Override
776            public void onAnimationEnd(Animator animation) {
777                if (mRemoveEmptyScreenRunnable != null) {
778                    mRemoveEmptyScreenRunnable.run();
779                }
780                if (onComplete != null) {
781                    onComplete.run();
782                }
783            }
784        });
785        oa.start();
786    }
787
788    public boolean hasExtraEmptyScreen() {
789        int nScreens = getChildCount();
790        nScreens = nScreens - numCustomPages();
791        return mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID) && nScreens > 1;
792    }
793
794    public long commitExtraEmptyScreen() {
795        if (mLauncher.isWorkspaceLoading()) {
796            // Invalid and dangerous operation if workspace is loading
797            return -1;
798        }
799
800        int index = getPageIndexForScreenId(EXTRA_EMPTY_SCREEN_ID);
801        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
802        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
803        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
804
805        long newId = LauncherSettings.Settings.call(getContext().getContentResolver(),
806                LauncherSettings.Settings.METHOD_NEW_SCREEN_ID)
807                .getLong(LauncherSettings.Settings.EXTRA_VALUE);
808        mWorkspaceScreens.put(newId, cl);
809        mScreenOrder.add(newId);
810
811        // Update the page indicator marker
812        if (getPageIndicator() != null) {
813            getPageIndicator().updateMarker(index, getPageIndicatorMarker(index));
814        }
815
816        // Update the model for the new screen
817        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
818
819        return newId;
820    }
821
822    public CellLayout getScreenWithId(long screenId) {
823        return mWorkspaceScreens.get(screenId);
824    }
825
826    public long getIdForScreen(CellLayout layout) {
827        int index = mWorkspaceScreens.indexOfValue(layout);
828        if (index != -1) {
829            return mWorkspaceScreens.keyAt(index);
830        }
831        return -1;
832    }
833
834    public int getPageIndexForScreenId(long screenId) {
835        return indexOfChild(mWorkspaceScreens.get(screenId));
836    }
837
838    public long getScreenIdForPageIndex(int index) {
839        if (0 <= index && index < mScreenOrder.size()) {
840            return mScreenOrder.get(index);
841        }
842        return -1;
843    }
844
845    public ArrayList<Long> getScreenOrder() {
846        return mScreenOrder;
847    }
848
849    public void stripEmptyScreens() {
850        if (mLauncher.isWorkspaceLoading()) {
851            // Don't strip empty screens if the workspace is still loading.
852            // This is dangerous and can result in data loss.
853            return;
854        }
855
856        if (isPageMoving()) {
857            mStripScreensOnPageStopMoving = true;
858            return;
859        }
860
861        int currentPage = getNextPage();
862        ArrayList<Long> removeScreens = new ArrayList<Long>();
863        int total = mWorkspaceScreens.size();
864        for (int i = 0; i < total; i++) {
865            long id = mWorkspaceScreens.keyAt(i);
866            CellLayout cl = mWorkspaceScreens.valueAt(i);
867            if (id >= 0 && cl.getShortcutsAndWidgets().getChildCount() == 0) {
868                removeScreens.add(id);
869            }
870        }
871
872        LauncherAccessibilityDelegate delegate =
873                LauncherAppState.getInstance().getAccessibilityDelegate();
874
875        // We enforce at least one page to add new items to. In the case that we remove the last
876        // such screen, we convert the last screen to the empty screen
877        int minScreens = 1 + numCustomPages();
878
879        int pageShift = 0;
880        for (Long id: removeScreens) {
881            CellLayout cl = mWorkspaceScreens.get(id);
882            mWorkspaceScreens.remove(id);
883            mScreenOrder.remove(id);
884
885            if (getChildCount() > minScreens) {
886                if (indexOfChild(cl) < currentPage) {
887                    pageShift++;
888                }
889
890                if (delegate != null && delegate.isInAccessibleDrag()) {
891                    cl.enableAccessibleDrag(false, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
892                }
893
894                removeView(cl);
895            } else {
896                // if this is the last non-custom content screen, convert it to the empty screen
897                mRemoveEmptyScreenRunnable = null;
898                mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, cl);
899                mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
900            }
901        }
902
903        if (!removeScreens.isEmpty()) {
904            // Update the model if we have changed any screens
905            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
906        }
907
908        if (pageShift >= 0) {
909            setCurrentPage(currentPage - pageShift);
910        }
911    }
912
913    // See implementation for parameter definition.
914    void addInScreen(View child, long container, long screenId,
915            int x, int y, int spanX, int spanY) {
916        addInScreen(child, container, screenId, x, y, spanX, spanY, false, false);
917    }
918
919    // At bind time, we use the rank (screenId) to compute x and y for hotseat items.
920    // See implementation for parameter definition.
921    public void addInScreenFromBind(View child, long container, long screenId, int x, int y,
922            int spanX, int spanY) {
923        addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);
924    }
925
926    // See implementation for parameter definition.
927    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
928            boolean insert) {
929        addInScreen(child, container, screenId, x, y, spanX, spanY, insert, false);
930    }
931
932    /**
933     * Adds the specified child in the specified screen. The position and dimension of
934     * the child are defined by x, y, spanX and spanY.
935     *
936     * @param child The child to add in one of the workspace's screens.
937     * @param screenId The screen in which to add the child.
938     * @param x The X position of the child in the screen's grid.
939     * @param y The Y position of the child in the screen's grid.
940     * @param spanX The number of cells spanned horizontally by the child.
941     * @param spanY The number of cells spanned vertically by the child.
942     * @param insert When true, the child is inserted at the beginning of the children list.
943     * @param computeXYFromRank When true, we use the rank (stored in screenId) to compute
944     *                          the x and y position in which to place hotseat items. Otherwise
945     *                          we use the x and y position to compute the rank.
946     */
947    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
948            boolean insert, boolean computeXYFromRank) {
949        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
950            if (getScreenWithId(screenId) == null) {
951                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
952                // DEBUGGING - Print out the stack trace to see where we are adding from
953                new Throwable().printStackTrace();
954                return;
955            }
956        }
957        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
958            // This should never happen
959            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
960        }
961
962        final CellLayout layout;
963        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
964            layout = mLauncher.getHotseat().getLayout();
965            child.setOnKeyListener(new HotseatIconKeyEventListener());
966
967            // Hide folder title in the hotseat
968            if (child instanceof FolderIcon) {
969                ((FolderIcon) child).setTextVisible(false);
970            }
971
972            if (computeXYFromRank) {
973                x = mLauncher.getHotseat().getCellXFromOrder((int) screenId);
974                y = mLauncher.getHotseat().getCellYFromOrder((int) screenId);
975            } else {
976                screenId = mLauncher.getHotseat().getOrderInHotseat(x, y);
977            }
978        } else {
979            // Show folder title if not in the hotseat
980            if (child instanceof FolderIcon) {
981                ((FolderIcon) child).setTextVisible(true);
982            }
983            layout = getScreenWithId(screenId);
984            child.setOnKeyListener(new IconKeyEventListener());
985        }
986
987        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
988        CellLayout.LayoutParams lp;
989        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
990            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
991        } else {
992            lp = (CellLayout.LayoutParams) genericLp;
993            lp.cellX = x;
994            lp.cellY = y;
995            lp.cellHSpan = spanX;
996            lp.cellVSpan = spanY;
997        }
998
999        if (spanX < 0 && spanY < 0) {
1000            lp.isLockedToGrid = false;
1001        }
1002
1003        // Get the canonical child id to uniquely represent this view in this screen
1004        ItemInfo info = (ItemInfo) child.getTag();
1005        int childId = mLauncher.getViewIdForItem(info);
1006
1007        boolean markCellsAsOccupied = !(child instanceof Folder);
1008        if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) {
1009            // TODO: This branch occurs when the workspace is adding views
1010            // outside of the defined grid
1011            // maybe we should be deleting these items from the LauncherModel?
1012            Log.e(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout");
1013        }
1014
1015        if (!(child instanceof Folder)) {
1016            child.setHapticFeedbackEnabled(false);
1017            child.setOnLongClickListener(mLongClickListener);
1018        }
1019        if (child instanceof DropTarget) {
1020            mDragController.addDropTarget((DropTarget) child);
1021        }
1022    }
1023
1024    /**
1025     * Called directly from a CellLayout (not by the framework), after we've been added as a
1026     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
1027     * that it should intercept touch events, which is not something that is normally supported.
1028     */
1029    @SuppressLint("ClickableViewAccessibility")
1030    @Override
1031    public boolean onTouch(View v, MotionEvent event) {
1032        return (workspaceInModalState() || !isFinishedSwitchingState())
1033                || (!workspaceInModalState() && indexOfChild(v) != mCurrentPage);
1034    }
1035
1036    public boolean isSwitchingState() {
1037        return mIsSwitchingState;
1038    }
1039
1040    /** This differs from isSwitchingState in that we take into account how far the transition
1041     *  has completed. */
1042    public boolean isFinishedSwitchingState() {
1043        return !mIsSwitchingState || (mTransitionProgress > 0.5f);
1044    }
1045
1046    protected void onWindowVisibilityChanged (int visibility) {
1047        mLauncher.onWindowVisibilityChanged(visibility);
1048    }
1049
1050    @Override
1051    public boolean dispatchUnhandledMove(View focused, int direction) {
1052        if (workspaceInModalState() || !isFinishedSwitchingState()) {
1053            // when the home screens are shrunken, shouldn't allow side-scrolling
1054            return false;
1055        }
1056        return super.dispatchUnhandledMove(focused, direction);
1057    }
1058
1059    @Override
1060    public boolean onInterceptTouchEvent(MotionEvent ev) {
1061        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
1062        case MotionEvent.ACTION_DOWN:
1063            mXDown = ev.getX();
1064            mYDown = ev.getY();
1065            mTouchDownTime = System.currentTimeMillis();
1066            break;
1067        case MotionEvent.ACTION_POINTER_UP:
1068        case MotionEvent.ACTION_UP:
1069            if (mTouchState == TOUCH_STATE_REST) {
1070                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
1071                if (currentPage != null) {
1072                    onWallpaperTap(ev);
1073                }
1074            }
1075        }
1076        return super.onInterceptTouchEvent(ev);
1077    }
1078
1079    @Override
1080    public boolean onGenericMotionEvent(MotionEvent event) {
1081        // Ignore pointer scroll events if the custom content doesn't allow scrolling.
1082        if ((getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID)
1083                && (mCustomContentCallbacks != null)
1084                && !mCustomContentCallbacks.isScrollingAllowed()) {
1085            return false;
1086        }
1087        return super.onGenericMotionEvent(event);
1088    }
1089
1090    protected void reinflateWidgetsIfNecessary() {
1091        final int clCount = getChildCount();
1092        for (int i = 0; i < clCount; i++) {
1093            CellLayout cl = (CellLayout) getChildAt(i);
1094            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
1095            final int itemCount = swc.getChildCount();
1096            for (int j = 0; j < itemCount; j++) {
1097                View v = swc.getChildAt(j);
1098
1099                if (v != null  && v.getTag() instanceof LauncherAppWidgetInfo) {
1100                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
1101                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) info.hostView;
1102                    if (lahv != null && lahv.isReinflateRequired()) {
1103                        // Remove and rebind the current widget (which was inflated in the wrong
1104                        // orientation), but don't delete it from the database
1105                        mLauncher.removeItem(lahv, info, false  /* deleteFromDb */);
1106                        mLauncher.bindAppWidget(info);
1107                    }
1108                }
1109            }
1110        }
1111    }
1112
1113    @Override
1114    protected void determineScrollingStart(MotionEvent ev) {
1115        if (!isFinishedSwitchingState()) return;
1116
1117        float deltaX = ev.getX() - mXDown;
1118        float absDeltaX = Math.abs(deltaX);
1119        float absDeltaY = Math.abs(ev.getY() - mYDown);
1120
1121        if (Float.compare(absDeltaX, 0f) == 0) return;
1122
1123        float slope = absDeltaY / absDeltaX;
1124        float theta = (float) Math.atan(slope);
1125
1126        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
1127            cancelCurrentPageLongPress();
1128        }
1129
1130        boolean passRightSwipesToCustomContent =
1131                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
1132
1133        boolean swipeInIgnoreDirection = mIsRtl ? deltaX < 0 : deltaX > 0;
1134        boolean onCustomContentScreen =
1135                getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID;
1136        if (swipeInIgnoreDirection && onCustomContentScreen && passRightSwipesToCustomContent) {
1137            // Pass swipes to the right to the custom content page.
1138            return;
1139        }
1140
1141        if (onCustomContentScreen && (mCustomContentCallbacks != null)
1142                && !mCustomContentCallbacks.isScrollingAllowed()) {
1143            // Don't allow workspace scrolling if the current custom content screen doesn't allow
1144            // scrolling.
1145            return;
1146        }
1147
1148        if (theta > MAX_SWIPE_ANGLE) {
1149            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
1150            return;
1151        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
1152            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
1153            // increase the touch slop to make it harder to begin scrolling the workspace. This
1154            // results in vertically scrolling widgets to more easily. The higher the angle, the
1155            // more we increase touch slop.
1156            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
1157            float extraRatio = (float)
1158                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
1159            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
1160        } else {
1161            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
1162            super.determineScrollingStart(ev);
1163        }
1164    }
1165
1166    protected void onPageBeginMoving() {
1167        super.onPageBeginMoving();
1168
1169        if (isHardwareAccelerated()) {
1170            updateChildrenLayersEnabled(false);
1171        } else {
1172            if (mNextPage != INVALID_PAGE) {
1173                // we're snapping to a particular screen
1174                enableChildrenCache(mCurrentPage, mNextPage);
1175            } else {
1176                // this is when user is actively dragging a particular screen, they might
1177                // swipe it either left or right (but we won't advance by more than one screen)
1178                enableChildrenCache(mCurrentPage - 1, mCurrentPage + 1);
1179            }
1180        }
1181    }
1182
1183    protected void onPageEndMoving() {
1184        super.onPageEndMoving();
1185
1186        if (isHardwareAccelerated()) {
1187            updateChildrenLayersEnabled(false);
1188        } else {
1189            clearChildrenCache();
1190        }
1191
1192        if (mDragController.isDragging()) {
1193            if (workspaceInModalState()) {
1194                // If we are in springloaded mode, then force an event to check if the current touch
1195                // is under a new page (to scroll to)
1196                mDragController.forceTouchMove();
1197            }
1198        }
1199
1200        if (mDelayedResizeRunnable != null && !mIsSwitchingState) {
1201            mDelayedResizeRunnable.run();
1202            mDelayedResizeRunnable = null;
1203        }
1204
1205        if (mDelayedSnapToPageRunnable != null) {
1206            mDelayedSnapToPageRunnable.run();
1207            mDelayedSnapToPageRunnable = null;
1208        }
1209        if (mStripScreensOnPageStopMoving) {
1210            stripEmptyScreens();
1211            mStripScreensOnPageStopMoving = false;
1212        }
1213    }
1214
1215    protected void onScrollInteractionBegin() {
1216        super.onScrollInteractionEnd();
1217        mScrollInteractionBegan = true;
1218    }
1219
1220    protected void onScrollInteractionEnd() {
1221        super.onScrollInteractionEnd();
1222        mScrollInteractionBegan = false;
1223        if (mStartedSendingScrollEvents) {
1224            mStartedSendingScrollEvents = false;
1225            mLauncherOverlay.onScrollInteractionEnd();
1226        }
1227    }
1228
1229    public void setLauncherOverlay(LauncherOverlay overlay) {
1230        mLauncherOverlay = overlay;
1231        // A new overlay has been set. Reset event tracking
1232        mStartedSendingScrollEvents = false;
1233        onOverlayScrollChanged(0);
1234    }
1235
1236    @Override
1237    protected int getUnboundedScrollX() {
1238        if (mLauncherOverlay != null) {
1239            if ((mIsRtl && mUnboundedScrollX > mMaxScrollX) ||
1240                    (!mIsRtl && mUnboundedScrollX < 0)) {
1241                return mUnboundedScrollX;
1242            }
1243        }
1244
1245        return super.getUnboundedScrollX();
1246    }
1247
1248    @Override
1249    public void scrollTo(int x, int y) {
1250        mUnboundedScrollX = x;
1251        super.scrollTo(x, y);
1252    }
1253
1254    @Override
1255    protected void overScroll(float amount) {
1256        boolean shouldOverScroll = (amount <= 0 && (!hasCustomContent() || mIsRtl)) ||
1257                (amount >= 0 && (!hasCustomContent() || !mIsRtl));
1258
1259        boolean shouldScrollOverlay = mLauncherOverlay != null &&
1260                ((amount <= 0 && !mIsRtl) || (amount >= 0 && mIsRtl));
1261
1262        boolean shouldZeroOverlay = mLauncherOverlay != null && mLastOverlaySroll != 0 &&
1263                ((amount >= 0 && !mIsRtl) || (amount <= 0 && mIsRtl));
1264
1265        if (shouldScrollOverlay) {
1266            if (!mStartedSendingScrollEvents && mScrollInteractionBegan) {
1267                mStartedSendingScrollEvents = true;
1268                mLauncherOverlay.onScrollInteractionBegin();
1269            }
1270
1271            mLastOverlaySroll = Math.abs(amount / getViewportWidth());
1272            mLauncherOverlay.onScrollChange(mLastOverlaySroll, mIsRtl);
1273        } else if (shouldOverScroll) {
1274            dampedOverScroll(amount);
1275        }
1276
1277        if (shouldZeroOverlay) {
1278            mLauncherOverlay.onScrollChange(0, mIsRtl);
1279        }
1280    }
1281
1282    private final Interpolator mAlphaInterpolator = new DecelerateInterpolator(3f);
1283
1284    /**
1285     * The overlay scroll is being controlled locally, just update our overlay effect
1286     */
1287    public void onOverlayScrollChanged(float scroll) {
1288        float offset = 0f;
1289        float slip = 0f;
1290
1291        scroll = Math.max(scroll - offset, 0);
1292        scroll = Math.min(1, scroll / (1 - offset));
1293
1294        float alpha = 1 - mAlphaInterpolator.getInterpolation(scroll);
1295        float transX = mLauncher.getDragLayer().getMeasuredWidth() * scroll;
1296        transX *= 1 - slip;
1297
1298        if (mIsRtl) {
1299            transX = -transX;
1300        }
1301        mOverlayTranslation = transX;
1302
1303        // TODO(adamcohen): figure out a final effect here. We may need to recommend
1304        // different effects based on device performance. On at least one relatively high-end
1305        // device I've tried, translating the launcher causes things to get quite laggy.
1306        setTranslationAndAlpha(mLauncher.getSearchDropTargetBar(), transX, alpha);
1307        setTranslationAndAlpha(getPageIndicator(), transX, alpha);
1308        setTranslationAndAlpha(getChildAt(getCurrentPage()), transX, alpha);
1309        setTranslationAndAlpha(mLauncher.getHotseat(), transX, alpha);
1310
1311        // When the animation finishes, reset all pages, just in case we missed a page.
1312        if (transX == 0) {
1313            for (int i = getChildCount() - 1; i >= 0; i--) {
1314                setTranslationAndAlpha(getChildAt(i), 0, alpha);
1315            }
1316        }
1317    }
1318
1319    @Override
1320    protected Matrix getPageShiftMatrix() {
1321        if (Float.compare(mOverlayTranslation, 0) != 0) {
1322            // The pages are translated by mOverlayTranslation. incorporate that in the
1323            // visible page calculation by shifting everything back by that same amount.
1324            mTempMatrix.set(getMatrix());
1325            mTempMatrix.postTranslate(-mOverlayTranslation, 0);
1326            return mTempMatrix;
1327        }
1328        return super.getPageShiftMatrix();
1329    }
1330
1331    private void setTranslationAndAlpha(View v, float transX, float alpha) {
1332        if (v != null) {
1333            v.setTranslationX(transX);
1334            v.setAlpha(alpha);
1335        }
1336    }
1337
1338    @Override
1339    protected void getEdgeVerticalPostion(int[] pos) {
1340        View child = getChildAt(getPageCount() - 1);
1341        pos[0] = child.getTop();
1342        pos[1] = child.getBottom();
1343    }
1344
1345    @Override
1346    protected void notifyPageSwitchListener() {
1347        super.notifyPageSwitchListener();
1348
1349        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
1350            mCustomContentShowing = true;
1351            if (mCustomContentCallbacks != null) {
1352                mCustomContentCallbacks.onShow(false);
1353                mCustomContentShowTime = System.currentTimeMillis();
1354            }
1355        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
1356            mCustomContentShowing = false;
1357            if (mCustomContentCallbacks != null) {
1358                mCustomContentCallbacks.onHide();
1359            }
1360        }
1361    }
1362
1363    protected CustomContentCallbacks getCustomContentCallbacks() {
1364        return mCustomContentCallbacks;
1365    }
1366
1367    protected void setWallpaperDimension() {
1368        new AsyncTask<Void, Void, Void>() {
1369            public Void doInBackground(Void ... args) {
1370                if (Utilities.ATLEAST_KITKAT) {
1371                    WallpaperUtils.suggestWallpaperDimension(mLauncher);
1372                } else {
1373                    WallpaperUtils.suggestWallpaperDimensionPreK(mLauncher,
1374                            mLauncher.overrideWallpaperDimensions());
1375                }
1376                return null;
1377            }
1378        }.executeOnExecutor(Utilities.THREAD_POOL_EXECUTOR);
1379    }
1380
1381    protected void snapToPage(int whichPage, Runnable r) {
1382        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION, r);
1383    }
1384
1385    protected void snapToPage(int whichPage, int duration, Runnable r) {
1386        if (mDelayedSnapToPageRunnable != null) {
1387            mDelayedSnapToPageRunnable.run();
1388        }
1389        mDelayedSnapToPageRunnable = r;
1390        snapToPage(whichPage, duration);
1391    }
1392
1393    public void snapToScreenId(long screenId) {
1394        snapToScreenId(screenId, null);
1395    }
1396
1397    protected void snapToScreenId(long screenId, Runnable r) {
1398        snapToPage(getPageIndexForScreenId(screenId), r);
1399    }
1400
1401    @Override
1402    public void computeScroll() {
1403        super.computeScroll();
1404        mWallpaperOffset.syncWithScroll();
1405    }
1406
1407    @Override
1408    protected void determineScrollingStart(MotionEvent ev, float touchSlopScale) {
1409        if (!isSwitchingState()) {
1410            super.determineScrollingStart(ev, touchSlopScale);
1411        }
1412    }
1413
1414    @Override
1415    public void announceForAccessibility(CharSequence text) {
1416        // Don't announce if apps is on top of us.
1417        if (!mLauncher.isAppsViewVisible()) {
1418            super.announceForAccessibility(text);
1419        }
1420    }
1421
1422    public void showOutlinesTemporarily() {
1423        if (!mIsPageMoving && !isTouchActive()) {
1424            snapToPage(mCurrentPage);
1425        }
1426    }
1427
1428    private void updatePageAlphaValues(int screenCenter) {
1429        if (mWorkspaceFadeInAdjacentScreens &&
1430                !workspaceInModalState() &&
1431                !mIsSwitchingState) {
1432            for (int i = numCustomPages(); i < getChildCount(); i++) {
1433                CellLayout child = (CellLayout) getChildAt(i);
1434                if (child != null) {
1435                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1436                    float alpha = 1 - Math.abs(scrollProgress);
1437                    child.getShortcutsAndWidgets().setAlpha(alpha);
1438                }
1439            }
1440        }
1441    }
1442
1443    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
1444    @Override
1445    public void enableAccessibleDrag(boolean enable) {
1446        for (int i = 0; i < getChildCount(); i++) {
1447            CellLayout child = (CellLayout) getChildAt(i);
1448            child.enableAccessibleDrag(enable, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
1449        }
1450
1451        if (enable) {
1452            // We need to allow our individual children to become click handlers in this case
1453            setOnClickListener(null);
1454        } else {
1455            // Reset our click listener
1456            setOnClickListener(mLauncher);
1457        }
1458        mLauncher.getSearchDropTargetBar().enableAccessibleDrag(enable);
1459        mLauncher.getAppInfoDropTargetBar().enableAccessibleDrag(enable);
1460        mLauncher.getHotseat().getLayout()
1461            .enableAccessibleDrag(enable, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
1462    }
1463
1464    public boolean hasCustomContent() {
1465        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1466    }
1467
1468    public int numCustomPages() {
1469        return hasCustomContent() ? 1 : 0;
1470    }
1471
1472    public boolean isOnOrMovingToCustomContent() {
1473        return hasCustomContent() && getNextPage() == 0 && mRestorePage == INVALID_RESTORE_PAGE;
1474    }
1475
1476    private void updateStateForCustomContent(int screenCenter) {
1477        float translationX = 0;
1478        float progress = 0;
1479        if (hasCustomContent()) {
1480            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1481
1482            int scrollDelta = getScrollX() - getScrollForPage(index) -
1483                    getLayoutTransitionOffsetForPage(index);
1484            float scrollRange = getScrollForPage(index + 1) - getScrollForPage(index);
1485            translationX = scrollRange - scrollDelta;
1486            progress = (scrollRange - scrollDelta) / scrollRange;
1487
1488            if (mIsRtl) {
1489                translationX = Math.min(0, translationX);
1490            } else {
1491                translationX = Math.max(0, translationX);
1492            }
1493            progress = Math.max(0, progress);
1494        }
1495
1496        if (Float.compare(progress, mLastCustomContentScrollProgress) == 0) return;
1497
1498        CellLayout cc = mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID);
1499        if (progress > 0 && cc.getVisibility() != VISIBLE && !workspaceInModalState()) {
1500            cc.setVisibility(VISIBLE);
1501        }
1502
1503        mLastCustomContentScrollProgress = progress;
1504
1505        // We should only update the drag layer background alpha if we are not in all apps or the
1506        // widgets tray
1507        if (mState == State.NORMAL) {
1508            mLauncher.getDragLayer().setBackgroundAlpha(progress == 1 ? 0 : progress * 0.8f);
1509        }
1510
1511        if (mLauncher.getHotseat() != null) {
1512            mLauncher.getHotseat().setTranslationX(translationX);
1513        }
1514
1515        if (getPageIndicator() != null) {
1516            getPageIndicator().setTranslationX(translationX);
1517        }
1518
1519        if (mCustomContentCallbacks != null) {
1520            mCustomContentCallbacks.onScrollProgressChanged(progress);
1521        }
1522    }
1523
1524    @Override
1525    protected OnClickListener getPageIndicatorClickListener() {
1526        AccessibilityManager am = (AccessibilityManager)
1527                getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
1528        if (!am.isTouchExplorationEnabled()) {
1529            return null;
1530        }
1531        return new OnClickListener() {
1532            @Override
1533            public void onClick(View arg0) {
1534                mLauncher.showOverviewMode(true);
1535            }
1536        };
1537    }
1538
1539    @Override
1540    protected void screenScrolled(int screenCenter) {
1541        updatePageAlphaValues(screenCenter);
1542        updateStateForCustomContent(screenCenter);
1543        enableHwLayersOnVisiblePages();
1544    }
1545
1546    protected void onAttachedToWindow() {
1547        super.onAttachedToWindow();
1548        IBinder windowToken = getWindowToken();
1549        mWallpaperOffset.setWindowToken(windowToken);
1550        computeScroll();
1551        mDragController.setWindowToken(windowToken);
1552    }
1553
1554    protected void onDetachedFromWindow() {
1555        super.onDetachedFromWindow();
1556        mWallpaperOffset.setWindowToken(null);
1557    }
1558
1559    protected void onResume() {
1560        if (getPageIndicator() != null) {
1561            // In case accessibility state has changed, we need to perform this on every
1562            // attach to window
1563            OnClickListener listener = getPageIndicatorClickListener();
1564            if (listener != null) {
1565                getPageIndicator().setOnClickListener(listener);
1566            }
1567        }
1568
1569        // Update wallpaper dimensions if they were changed since last onResume
1570        // (we also always set the wallpaper dimensions in the constructor)
1571        if (LauncherAppState.getInstance().hasWallpaperChangedSinceLastCheck()) {
1572            setWallpaperDimension();
1573        }
1574        mWallpaperOffset.onResume();
1575    }
1576
1577    @Override
1578    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1579        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1580            mWallpaperOffset.syncWithScroll();
1581            mWallpaperOffset.jumpToFinal();
1582        }
1583        super.onLayout(changed, left, top, right, bottom);
1584    }
1585
1586    @Override
1587    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
1588        if (!mLauncher.isAppsViewVisible()) {
1589            final Folder openFolder = getOpenFolder();
1590            if (openFolder != null) {
1591                return openFolder.requestFocus(direction, previouslyFocusedRect);
1592            } else {
1593                return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
1594            }
1595        }
1596        return false;
1597    }
1598
1599    @Override
1600    public int getDescendantFocusability() {
1601        if (workspaceInModalState()) {
1602            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1603        }
1604        return super.getDescendantFocusability();
1605    }
1606
1607    @Override
1608    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
1609        if (!mLauncher.isAppsViewVisible()) {
1610            final Folder openFolder = getOpenFolder();
1611            if (openFolder != null) {
1612                openFolder.addFocusables(views, direction);
1613            } else {
1614                super.addFocusables(views, direction, focusableMode);
1615            }
1616        }
1617    }
1618
1619    public boolean workspaceInModalState() {
1620        return mState != State.NORMAL;
1621    }
1622
1623    void enableChildrenCache(int fromPage, int toPage) {
1624        if (fromPage > toPage) {
1625            final int temp = fromPage;
1626            fromPage = toPage;
1627            toPage = temp;
1628        }
1629
1630        final int screenCount = getChildCount();
1631
1632        fromPage = Math.max(fromPage, 0);
1633        toPage = Math.min(toPage, screenCount - 1);
1634
1635        for (int i = fromPage; i <= toPage; i++) {
1636            final CellLayout layout = (CellLayout) getChildAt(i);
1637            layout.setChildrenDrawnWithCacheEnabled(true);
1638            layout.setChildrenDrawingCacheEnabled(true);
1639        }
1640    }
1641
1642    void clearChildrenCache() {
1643        final int screenCount = getChildCount();
1644        for (int i = 0; i < screenCount; i++) {
1645            final CellLayout layout = (CellLayout) getChildAt(i);
1646            layout.setChildrenDrawnWithCacheEnabled(false);
1647            // In software mode, we don't want the items to continue to be drawn into bitmaps
1648            if (!isHardwareAccelerated()) {
1649                layout.setChildrenDrawingCacheEnabled(false);
1650            }
1651        }
1652    }
1653
1654    @Thunk void updateChildrenLayersEnabled(boolean force) {
1655        boolean small = mState == State.OVERVIEW || mIsSwitchingState;
1656        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageMoving();
1657
1658        if (enableChildrenLayers != mChildrenLayersEnabled) {
1659            mChildrenLayersEnabled = enableChildrenLayers;
1660            if (mChildrenLayersEnabled) {
1661                enableHwLayersOnVisiblePages();
1662            } else {
1663                for (int i = 0; i < getPageCount(); i++) {
1664                    final CellLayout cl = (CellLayout) getChildAt(i);
1665                    cl.enableHardwareLayer(false);
1666                }
1667            }
1668        }
1669    }
1670
1671    private void enableHwLayersOnVisiblePages() {
1672        if (mChildrenLayersEnabled) {
1673            final int screenCount = getChildCount();
1674            getVisiblePages(mTempVisiblePagesRange);
1675            int leftScreen = mTempVisiblePagesRange[0];
1676            int rightScreen = mTempVisiblePagesRange[1];
1677            if (leftScreen == rightScreen) {
1678                // make sure we're caching at least two pages always
1679                if (rightScreen < screenCount - 1) {
1680                    rightScreen++;
1681                } else if (leftScreen > 0) {
1682                    leftScreen--;
1683                }
1684            }
1685
1686            final CellLayout customScreen = mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID);
1687            for (int i = 0; i < screenCount; i++) {
1688                final CellLayout layout = (CellLayout) getPageAt(i);
1689
1690                // enable layers between left and right screen inclusive, except for the
1691                // customScreen, which may animate its content during transitions.
1692                boolean enableLayer = layout != customScreen &&
1693                        leftScreen <= i && i <= rightScreen && shouldDrawChild(layout);
1694                layout.enableHardwareLayer(enableLayer);
1695            }
1696        }
1697    }
1698
1699    public void buildPageHardwareLayers() {
1700        // force layers to be enabled just for the call to buildLayer
1701        updateChildrenLayersEnabled(true);
1702        if (getWindowToken() != null) {
1703            final int childCount = getChildCount();
1704            for (int i = 0; i < childCount; i++) {
1705                CellLayout cl = (CellLayout) getChildAt(i);
1706                cl.buildHardwareLayer();
1707            }
1708        }
1709        updateChildrenLayersEnabled(false);
1710    }
1711
1712    @Override
1713    protected void getVisiblePages(int[] range) {
1714        super.getVisiblePages(range);
1715        if (mForceDrawAdjacentPages) {
1716            // In overview mode, make sure that the two side pages are visible.
1717            range[0] = Utilities.boundInRange(getCurrentPage() - 1, numCustomPages(), range[1]);
1718            range[1] = Utilities.boundInRange(getCurrentPage() + 1, range[0], getPageCount() - 1);
1719        }
1720    }
1721
1722    protected void onWallpaperTap(MotionEvent ev) {
1723        final int[] position = mTempXY;
1724        getLocationOnScreen(position);
1725
1726        int pointerIndex = ev.getActionIndex();
1727        position[0] += (int) ev.getX(pointerIndex);
1728        position[1] += (int) ev.getY(pointerIndex);
1729
1730        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1731                ev.getAction() == MotionEvent.ACTION_UP
1732                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1733                position[0], position[1], 0, null);
1734    }
1735
1736    /*
1737    *
1738    * We call these methods (onDragStartedWithItemSpans/onDragStartedWithSize) whenever we
1739    * start a drag in Launcher, regardless of whether the drag has ever entered the Workspace
1740    *
1741    * These methods mark the appropriate pages as accepting drops (which alters their visual
1742    * appearance).
1743    *
1744    */
1745    private static Rect getDrawableBounds(Drawable d) {
1746        Rect bounds = new Rect();
1747        d.copyBounds(bounds);
1748        if (bounds.width() == 0 || bounds.height() == 0) {
1749            bounds.set(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
1750        } else {
1751            bounds.offsetTo(0, 0);
1752        }
1753        if (d instanceof PreloadIconDrawable) {
1754            int inset = -((PreloadIconDrawable) d).getOutset();
1755            bounds.inset(inset, inset);
1756        }
1757        return bounds;
1758    }
1759
1760    public void onExternalDragStartedWithItem(View v) {
1761        // Compose a drag bitmap with the view scaled to the icon size
1762        DeviceProfile grid = mLauncher.getDeviceProfile();
1763        int iconSize = grid.iconSizePx;
1764        int bmpWidth = v.getMeasuredWidth();
1765        int bmpHeight = v.getMeasuredHeight();
1766
1767        // If this is a text view, use its drawable instead
1768        if (v instanceof TextView) {
1769            Drawable d = getTextViewIcon((TextView) v);
1770            Rect bounds = getDrawableBounds(d);
1771            bmpWidth = bounds.width();
1772            bmpHeight = bounds.height();
1773        }
1774
1775        // Compose the bitmap to create the icon from
1776        Bitmap b = Bitmap.createBitmap(bmpWidth, bmpHeight,
1777                Bitmap.Config.ARGB_8888);
1778        mCanvas.setBitmap(b);
1779        drawDragView(v, mCanvas, 0);
1780        mCanvas.setBitmap(null);
1781
1782        // The outline is used to visualize where the item will land if dropped
1783        mDragOutline = createDragOutline(b, DRAG_BITMAP_PADDING, iconSize, iconSize, true);
1784    }
1785
1786    public void onDragStartedWithItem(PendingAddItemInfo info, Bitmap b, boolean clipAlpha) {
1787        // Find a page that has enough space to place this widget (after rearranging/resizing).
1788        // Start at the current page and search right (on LTR) until finding a page with enough
1789        // space. Since an empty screen is the furthest right, a page must be found.
1790        int currentPageInOverview = getPageNearestToCenterOfScreen();
1791        for (int pageIndex = currentPageInOverview; pageIndex < getPageCount(); pageIndex++) {
1792            CellLayout page = (CellLayout) getPageAt(pageIndex);
1793            if (page.hasReorderSolution(info)) {
1794                setCurrentPage(pageIndex);
1795                break;
1796            }
1797        }
1798
1799        int[] size = estimateItemSize(info, false);
1800
1801        // The outline is used to visualize where the item will land if dropped
1802        mDragOutline = createDragOutline(b, DRAG_BITMAP_PADDING, size[0], size[1], clipAlpha);
1803    }
1804
1805    public void exitWidgetResizeMode() {
1806        DragLayer dragLayer = mLauncher.getDragLayer();
1807        dragLayer.clearAllResizeFrames();
1808    }
1809
1810    @Override
1811    protected void getFreeScrollPageRange(int[] range) {
1812        getOverviewModePages(range);
1813    }
1814
1815    private void getOverviewModePages(int[] range) {
1816        int start = numCustomPages();
1817        int end = getChildCount() - 1;
1818
1819        range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
1820        range[1] = Math.max(0,  end);
1821    }
1822
1823    public void onStartReordering() {
1824        super.onStartReordering();
1825        // Reordering handles its own animations, disable the automatic ones.
1826        disableLayoutTransitions();
1827    }
1828
1829    public void onEndReordering() {
1830        super.onEndReordering();
1831
1832        if (mLauncher.isWorkspaceLoading()) {
1833            // Invalid and dangerous operation if workspace is loading
1834            return;
1835        }
1836
1837        mScreenOrder.clear();
1838        int count = getChildCount();
1839        for (int i = 0; i < count; i++) {
1840            CellLayout cl = ((CellLayout) getChildAt(i));
1841            mScreenOrder.add(getIdForScreen(cl));
1842        }
1843
1844        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1845
1846        // Re-enable auto layout transitions for page deletion.
1847        enableLayoutTransitions();
1848    }
1849
1850    public boolean isInOverviewMode() {
1851        return mState == State.OVERVIEW;
1852    }
1853
1854    public void snapToPageFromOverView(int whichPage) {
1855        mStateTransitionAnimation.snapToPageFromOverView(whichPage);
1856    }
1857
1858    int getOverviewModeTranslationY() {
1859        DeviceProfile grid = mLauncher.getDeviceProfile();
1860        Rect workspacePadding = grid.getWorkspacePadding(Utilities.isRtl(getResources()));
1861        int overviewButtonBarHeight = grid.getOverviewModeButtonBarHeight();
1862
1863        int scaledHeight = (int) (mOverviewModeShrinkFactor * getNormalChildHeight());
1864        int workspaceTop = mInsets.top + workspacePadding.top;
1865        int workspaceBottom = getViewportHeight() - mInsets.bottom - workspacePadding.bottom;
1866        int overviewTop = mInsets.top;
1867        int overviewBottom = getViewportHeight() - mInsets.bottom - overviewButtonBarHeight;
1868        int workspaceOffsetTopEdge = workspaceTop + ((workspaceBottom - workspaceTop) - scaledHeight) / 2;
1869        int overviewOffsetTopEdge = overviewTop + (overviewBottom - overviewTop - scaledHeight) / 2;
1870        return -workspaceOffsetTopEdge + overviewOffsetTopEdge;
1871    }
1872
1873    int getSpringLoadedTranslationY() {
1874        DeviceProfile grid = mLauncher.getDeviceProfile();
1875        Rect workspacePadding = grid.getWorkspacePadding(Utilities.isRtl(getResources()));
1876        int scaledHeight = (int) (mSpringLoadedShrinkFactor * getNormalChildHeight());
1877        int workspaceTop = mInsets.top + workspacePadding.top;
1878        int workspaceBottom = getViewportHeight() - mInsets.bottom - workspacePadding.bottom;
1879        int workspaceHeight = workspaceBottom - workspaceTop;
1880        // Center the spring-loaded pages by translating it up by half of the reduced height.
1881        return -(workspaceHeight - scaledHeight) / 2;
1882    }
1883
1884    /**
1885     * Sets the current workspace {@link State}, returning an animation transitioning the workspace
1886     * to that new state.
1887     */
1888    public Animator setStateWithAnimation(State toState, boolean animated,
1889            HashMap<View, Integer> layerViews) {
1890        // Create the animation to the new state
1891        Animator workspaceAnim =  mStateTransitionAnimation.getAnimationToState(mState,
1892                toState, animated, layerViews);
1893
1894        // Update the current state
1895        mState = toState;
1896        updateAccessibilityFlags();
1897        if (mState == State.OVERVIEW || mState == State.SPRING_LOADED) {
1898            // Redraw pages, as we might want to draw pages which were not visible.
1899            mForceDrawAdjacentPages = true;
1900            invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
1901        }
1902
1903        return workspaceAnim;
1904    }
1905
1906    State getState() {
1907        return mState;
1908    }
1909
1910    public void updateAccessibilityFlags() {
1911        if (Utilities.ATLEAST_LOLLIPOP) {
1912            int total = getPageCount();
1913            for (int i = numCustomPages(); i < total; i++) {
1914                updateAccessibilityFlags((CellLayout) getPageAt(i), i);
1915            }
1916            setImportantForAccessibility((mState == State.NORMAL || mState == State.OVERVIEW)
1917                    ? IMPORTANT_FOR_ACCESSIBILITY_AUTO
1918                    : IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
1919        } else {
1920            int accessible = mState == State.NORMAL ?
1921                    IMPORTANT_FOR_ACCESSIBILITY_AUTO :
1922                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
1923            setImportantForAccessibility(accessible);
1924        }
1925    }
1926
1927    private void updateAccessibilityFlags(CellLayout page, int pageNo) {
1928        if (mState == State.OVERVIEW) {
1929            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
1930            page.getShortcutsAndWidgets().setImportantForAccessibility(
1931                    IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
1932            page.setContentDescription(getPageDescription(pageNo));
1933
1934            if (mPagesAccessibilityDelegate == null) {
1935                mPagesAccessibilityDelegate = new OverviewScreenAccessibilityDelegate(this);
1936            }
1937            page.setAccessibilityDelegate(mPagesAccessibilityDelegate);
1938        } else {
1939            int accessible = mState == State.NORMAL ?
1940                    IMPORTANT_FOR_ACCESSIBILITY_AUTO :
1941                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
1942            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
1943            page.getShortcutsAndWidgets().setImportantForAccessibility(accessible);
1944            page.setContentDescription(null);
1945            page.setAccessibilityDelegate(null);
1946        }
1947    }
1948
1949    @Override
1950    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
1951        mIsSwitchingState = true;
1952        mTransitionProgress = 0;
1953
1954        // Invalidate here to ensure that the pages are rendered during the state change transition.
1955        invalidate();
1956
1957        updateChildrenLayersEnabled(false);
1958        hideCustomContentIfNecessary();
1959    }
1960
1961    @Override
1962    public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) {
1963    }
1964
1965    @Override
1966    public void onLauncherTransitionStep(Launcher l, float t) {
1967        mTransitionProgress = t;
1968    }
1969
1970    @Override
1971    public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) {
1972        mIsSwitchingState = false;
1973        updateChildrenLayersEnabled(false);
1974        showCustomContentIfNecessary();
1975        mForceDrawAdjacentPages = false;
1976    }
1977
1978    void updateCustomContentVisibility() {
1979        int visibility = mState == Workspace.State.NORMAL ? VISIBLE : INVISIBLE;
1980        if (hasCustomContent()) {
1981            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(visibility);
1982        }
1983    }
1984
1985    void showCustomContentIfNecessary() {
1986        boolean show  = mState == Workspace.State.NORMAL;
1987        if (show && hasCustomContent()) {
1988            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(VISIBLE);
1989        }
1990    }
1991
1992    void hideCustomContentIfNecessary() {
1993        boolean hide  = mState != Workspace.State.NORMAL;
1994        if (hide && hasCustomContent()) {
1995            disableLayoutTransitions();
1996            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
1997            enableLayoutTransitions();
1998        }
1999    }
2000
2001    /**
2002     * Returns the drawable for the given text view.
2003     */
2004    public static Drawable getTextViewIcon(TextView tv) {
2005        final Drawable[] drawables = tv.getCompoundDrawables();
2006        for (int i = 0; i < drawables.length; i++) {
2007            if (drawables[i] != null) {
2008                return drawables[i];
2009            }
2010        }
2011        return null;
2012    }
2013
2014    /**
2015     * Draw the View v into the given Canvas.
2016     *
2017     * @param v the view to draw
2018     * @param destCanvas the canvas to draw on
2019     * @param padding the horizontal and vertical padding to use when drawing
2020     */
2021    private static void drawDragView(View v, Canvas destCanvas, int padding) {
2022        destCanvas.save();
2023        if (v instanceof TextView) {
2024            Drawable d = getTextViewIcon((TextView) v);
2025            Rect bounds = getDrawableBounds(d);
2026            destCanvas.translate(padding / 2 - bounds.left, padding / 2 - bounds.top);
2027            d.draw(destCanvas);
2028        } else {
2029            final Rect clipRect = sTempRect;
2030            v.getDrawingRect(clipRect);
2031
2032            boolean textVisible = false;
2033            if (v instanceof FolderIcon) {
2034                // For FolderIcons the text can bleed into the icon area, and so we need to
2035                // hide the text completely (which can't be achieved by clipping).
2036                if (((FolderIcon) v).getTextVisible()) {
2037                    ((FolderIcon) v).setTextVisible(false);
2038                    textVisible = true;
2039                }
2040            }
2041            destCanvas.translate(-v.getScrollX() + padding / 2, -v.getScrollY() + padding / 2);
2042            destCanvas.clipRect(clipRect, Op.REPLACE);
2043            v.draw(destCanvas);
2044
2045            // Restore text visibility of FolderIcon if necessary
2046            if (textVisible) {
2047                ((FolderIcon) v).setTextVisible(true);
2048            }
2049        }
2050        destCanvas.restore();
2051    }
2052
2053    /**
2054     * Returns a new bitmap to show when the given View is being dragged around.
2055     * Responsibility for the bitmap is transferred to the caller.
2056     * @param expectedPadding padding to add to the drag view. If a different padding was used
2057     * its value will be changed
2058     */
2059    public Bitmap createDragBitmap(View v, AtomicInteger expectedPadding) {
2060        Bitmap b;
2061
2062        int padding = expectedPadding.get();
2063        if (v instanceof TextView) {
2064            Drawable d = getTextViewIcon((TextView) v);
2065            Rect bounds = getDrawableBounds(d);
2066            b = Bitmap.createBitmap(bounds.width() + padding,
2067                    bounds.height() + padding, Bitmap.Config.ARGB_8888);
2068            expectedPadding.set(padding - bounds.left - bounds.top);
2069        } else {
2070            b = Bitmap.createBitmap(
2071                    v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2072        }
2073
2074        mCanvas.setBitmap(b);
2075        drawDragView(v, mCanvas, padding);
2076        mCanvas.setBitmap(null);
2077
2078        return b;
2079    }
2080
2081    /**
2082     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2083     * Responsibility for the bitmap is transferred to the caller.
2084     */
2085    private Bitmap createDragOutline(View v, int padding) {
2086        final int outlineColor = getResources().getColor(R.color.outline_color);
2087        final Bitmap b = Bitmap.createBitmap(
2088                v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2089
2090        mCanvas.setBitmap(b);
2091        drawDragView(v, mCanvas, padding);
2092        mOutlineHelper.applyExpensiveOutlineWithBlur(b, mCanvas, outlineColor, outlineColor);
2093        mCanvas.setBitmap(null);
2094        return b;
2095    }
2096
2097    /**
2098     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2099     * Responsibility for the bitmap is transferred to the caller.
2100     */
2101    private Bitmap createDragOutline(Bitmap orig, int padding, int w, int h,
2102            boolean clipAlpha) {
2103        final int outlineColor = getResources().getColor(R.color.outline_color);
2104        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
2105        mCanvas.setBitmap(b);
2106
2107        Rect src = new Rect(0, 0, orig.getWidth(), orig.getHeight());
2108        float scaleFactor = Math.min((w - padding) / (float) orig.getWidth(),
2109                (h - padding) / (float) orig.getHeight());
2110        int scaledWidth = (int) (scaleFactor * orig.getWidth());
2111        int scaledHeight = (int) (scaleFactor * orig.getHeight());
2112        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
2113
2114        // center the image
2115        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
2116
2117        mCanvas.drawBitmap(orig, src, dst, null);
2118        mOutlineHelper.applyExpensiveOutlineWithBlur(b, mCanvas, outlineColor, outlineColor,
2119                clipAlpha);
2120        mCanvas.setBitmap(null);
2121
2122        return b;
2123    }
2124
2125    public void startDrag(CellLayout.CellInfo cellInfo) {
2126        startDrag(cellInfo, false);
2127    }
2128
2129    @Override
2130    public void startDrag(CellLayout.CellInfo cellInfo, boolean accessible) {
2131        View child = cellInfo.cell;
2132
2133        // Make sure the drag was started by a long press as opposed to a long click.
2134        if (!child.isInTouchMode()) {
2135            return;
2136        }
2137
2138        mDragInfo = cellInfo;
2139        child.setVisibility(INVISIBLE);
2140        CellLayout layout = (CellLayout) child.getParent().getParent();
2141        layout.prepareChildForDrag(child);
2142
2143        beginDragShared(child, this, accessible);
2144    }
2145
2146    public void beginDragShared(View child, DragSource source, boolean accessible) {
2147        beginDragShared(child, new Point(), source, accessible);
2148    }
2149
2150    public void beginDragShared(View child, Point relativeTouchPos, DragSource source,
2151            boolean accessible) {
2152        child.clearFocus();
2153        child.setPressed(false);
2154
2155        // The outline is used to visualize where the item will land if dropped
2156        mDragOutline = createDragOutline(child, DRAG_BITMAP_PADDING);
2157
2158        mLauncher.onDragStarted(child);
2159        // The drag bitmap follows the touch point around on the screen
2160        AtomicInteger padding = new AtomicInteger(DRAG_BITMAP_PADDING);
2161        final Bitmap b = createDragBitmap(child, padding);
2162
2163        final int bmpWidth = b.getWidth();
2164        final int bmpHeight = b.getHeight();
2165
2166        float scale = mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY);
2167        int dragLayerX = Math.round(mTempXY[0] - (bmpWidth - scale * child.getWidth()) / 2);
2168        int dragLayerY = Math.round(mTempXY[1] - (bmpHeight - scale * bmpHeight) / 2
2169                        - padding.get() / 2);
2170
2171        DeviceProfile grid = mLauncher.getDeviceProfile();
2172        Point dragVisualizeOffset = null;
2173        Rect dragRect = null;
2174        if (child instanceof BubbleTextView) {
2175            BubbleTextView icon = (BubbleTextView) child;
2176            int iconSize = grid.iconSizePx;
2177            int top = child.getPaddingTop();
2178            int left = (bmpWidth - iconSize) / 2;
2179            int right = left + iconSize;
2180            int bottom = top + iconSize;
2181            if (icon.isLayoutHorizontal()) {
2182                // If the layout is horizontal, then if we are just picking up the icon, then just
2183                // use the child position since the icon is top-left aligned.  Otherwise, offset
2184                // the drag layer position horizontally so that the icon is under the current
2185                // touch position.
2186                if (icon.getIcon().getBounds().contains(relativeTouchPos.x, relativeTouchPos.y)) {
2187                    dragLayerX = Math.round(mTempXY[0]);
2188                } else {
2189                    dragLayerX = Math.round(mTempXY[0] + relativeTouchPos.x - (bmpWidth / 2));
2190                }
2191            }
2192            dragLayerY += top;
2193            // Note: The drag region is used to calculate drag layer offsets, but the
2194            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2195            dragVisualizeOffset = new Point(-padding.get() / 2, padding.get() / 2);
2196            dragRect = new Rect(left, top, right, bottom);
2197        } else if (child instanceof FolderIcon) {
2198            int previewSize = grid.folderIconSizePx;
2199            dragVisualizeOffset = new Point(-padding.get() / 2,
2200                    padding.get() / 2 - child.getPaddingTop());
2201            dragRect = new Rect(0, child.getPaddingTop(), child.getWidth(), previewSize);
2202        }
2203
2204        // Clear the pressed state if necessary
2205        if (child instanceof BubbleTextView) {
2206            BubbleTextView icon = (BubbleTextView) child;
2207            icon.clearPressedBackground();
2208        }
2209
2210        Object dragObject = child.getTag();
2211        if (!(dragObject instanceof ItemInfo)) {
2212            String msg = "Drag started with a view that has no tag set. This "
2213                    + "will cause a crash (issue 11627249) down the line. "
2214                    + "View: " + child + "  tag: " + child.getTag();
2215            throw new IllegalStateException(msg);
2216        }
2217
2218        if (child.getParent() instanceof ShortcutAndWidgetContainer) {
2219            mDragSourceInternal = (ShortcutAndWidgetContainer) child.getParent();
2220        }
2221
2222        DragView dv = mDragController.startDrag(b, dragLayerX, dragLayerY, source,
2223                (ItemInfo) dragObject, DragController.DRAG_ACTION_MOVE, dragVisualizeOffset,
2224                dragRect, scale, accessible);
2225        dv.setIntrinsicIconScaleFactor(source.getIntrinsicIconScaleFactor());
2226
2227        b.recycle();
2228
2229        if (!FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND) {
2230            mLauncher.enterSpringLoadedDragMode();
2231        }
2232    }
2233
2234    public void beginExternalDragShared(View child, DragSource source) {
2235        DeviceProfile grid = mLauncher.getDeviceProfile();
2236        int iconSize = grid.iconSizePx;
2237
2238        // Notify launcher of drag start
2239        mLauncher.onDragStarted(child);
2240
2241        // Compose a new drag bitmap that is of the icon size
2242        AtomicInteger padding = new AtomicInteger(DRAG_BITMAP_PADDING);
2243        final Bitmap tmpB = createDragBitmap(child, padding);
2244        Bitmap b = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888);
2245        Paint p = new Paint();
2246        p.setFilterBitmap(true);
2247        mCanvas.setBitmap(b);
2248        mCanvas.drawBitmap(tmpB, new Rect(0, 0, tmpB.getWidth(), tmpB.getHeight()),
2249                new Rect(0, 0, iconSize, iconSize), p);
2250        mCanvas.setBitmap(null);
2251
2252        // Find the child's location on the screen
2253        int bmpWidth = tmpB.getWidth();
2254        float iconScale = (float) bmpWidth / iconSize;
2255        float scale = mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY) * iconScale;
2256        int dragLayerX = Math.round(mTempXY[0] - (bmpWidth - scale * child.getWidth()) / 2);
2257        int dragLayerY = Math.round(mTempXY[1]);
2258
2259        // Note: The drag region is used to calculate drag layer offsets, but the
2260        // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2261        Point dragVisualizeOffset = new Point(-padding.get() / 2, padding.get() / 2);
2262        Rect dragRect = new Rect(0, 0, iconSize, iconSize);
2263
2264        Object dragObject = child.getTag();
2265        if (!(dragObject instanceof ItemInfo)) {
2266            String msg = "Drag started with a view that has no tag set. This "
2267                    + "will cause a crash (issue 11627249) down the line. "
2268                    + "View: " + child + "  tag: " + child.getTag();
2269            throw new IllegalStateException(msg);
2270        }
2271
2272        // Start the drag
2273        DragView dv = mDragController.startDrag(b, dragLayerX, dragLayerY, source,
2274                (ItemInfo) dragObject, DragController.DRAG_ACTION_MOVE, dragVisualizeOffset,
2275                dragRect, scale, false);
2276        dv.setIntrinsicIconScaleFactor(source.getIntrinsicIconScaleFactor());
2277
2278        // Recycle temporary bitmaps
2279        tmpB.recycle();
2280
2281        if (!FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND) {
2282            mLauncher.enterSpringLoadedDragMode();
2283        }
2284    }
2285
2286    public boolean transitionStateShouldAllowDrop() {
2287        return ((!isSwitchingState() || mTransitionProgress > 0.5f) &&
2288                (mState == State.NORMAL || mState == State.SPRING_LOADED));
2289    }
2290
2291    /**
2292     * {@inheritDoc}
2293     */
2294    public boolean acceptDrop(DragObject d) {
2295        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2296        CellLayout dropTargetLayout = mDropToLayout;
2297        if (d.dragSource != this) {
2298            // Don't accept the drop if we're not over a screen at time of drop
2299            if (dropTargetLayout == null) {
2300                return false;
2301            }
2302            if (!transitionStateShouldAllowDrop()) return false;
2303
2304            mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2305
2306            // We want the point to be mapped to the dragTarget.
2307            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2308                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2309            } else {
2310                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2311            }
2312
2313            int spanX = 1;
2314            int spanY = 1;
2315            if (mDragInfo != null) {
2316                final CellLayout.CellInfo dragCellInfo = mDragInfo;
2317                spanX = dragCellInfo.spanX;
2318                spanY = dragCellInfo.spanY;
2319            } else {
2320                spanX = d.dragInfo.spanX;
2321                spanY = d.dragInfo.spanY;
2322            }
2323
2324            int minSpanX = spanX;
2325            int minSpanY = spanY;
2326            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2327                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2328                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2329            }
2330
2331            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2332                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2333                    mTargetCell);
2334            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2335                    mDragViewVisualCenter[1], mTargetCell);
2336            if (mCreateUserFolderOnDrop && willCreateUserFolder(d.dragInfo,
2337                    dropTargetLayout, mTargetCell, distance, true)) {
2338                return true;
2339            }
2340
2341            if (mAddToExistingFolderOnDrop && willAddToExistingUserFolder(d.dragInfo,
2342                    dropTargetLayout, mTargetCell, distance)) {
2343                return true;
2344            }
2345
2346            int[] resultSpan = new int[2];
2347            mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2348                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
2349                    null, mTargetCell, resultSpan, CellLayout.MODE_ACCEPT_DROP);
2350            boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2351
2352            // Don't accept the drop if there's no room for the item
2353            if (!foundCell) {
2354                // Don't show the message if we are dropping on the AllApps button and the hotseat
2355                // is full
2356                boolean isHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2357                if (mTargetCell != null && isHotseat) {
2358                    Hotseat hotseat = mLauncher.getHotseat();
2359                    if (hotseat.isAllAppsButtonRank(
2360                            hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]))) {
2361                        return false;
2362                    }
2363                }
2364
2365                mLauncher.showOutOfSpaceMessage(isHotseat);
2366                return false;
2367            }
2368        }
2369
2370        long screenId = getIdForScreen(dropTargetLayout);
2371        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
2372            commitExtraEmptyScreen();
2373        }
2374
2375        return true;
2376    }
2377
2378    boolean willCreateUserFolder(ItemInfo info, CellLayout target, int[] targetCell,
2379            float distance, boolean considerTimeout) {
2380        if (distance > mMaxDistanceForFolderCreation) return false;
2381        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2382        return willCreateUserFolder(info, dropOverView, considerTimeout);
2383    }
2384
2385    boolean willCreateUserFolder(ItemInfo info, View dropOverView, boolean considerTimeout) {
2386        if (dropOverView != null) {
2387            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2388            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2389                return false;
2390            }
2391        }
2392
2393        boolean hasntMoved = false;
2394        if (mDragInfo != null) {
2395            hasntMoved = dropOverView == mDragInfo.cell;
2396        }
2397
2398        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2399            return false;
2400        }
2401
2402        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2403        boolean willBecomeShortcut =
2404                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2405                        info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT);
2406
2407        return (aboveShortcut && willBecomeShortcut);
2408    }
2409
2410    boolean willAddToExistingUserFolder(ItemInfo dragInfo, CellLayout target, int[] targetCell,
2411            float distance) {
2412        if (distance > mMaxDistanceForFolderCreation) return false;
2413        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2414        return willAddToExistingUserFolder(dragInfo, dropOverView);
2415
2416    }
2417    boolean willAddToExistingUserFolder(ItemInfo dragInfo, View dropOverView) {
2418        if (dropOverView != null) {
2419            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2420            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2421                return false;
2422            }
2423        }
2424
2425        if (dropOverView instanceof FolderIcon) {
2426            FolderIcon fi = (FolderIcon) dropOverView;
2427            if (fi.acceptDrop(dragInfo)) {
2428                return true;
2429            }
2430        }
2431        return false;
2432    }
2433
2434    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2435            int[] targetCell, float distance, boolean external, DragView dragView,
2436            Runnable postAnimationRunnable) {
2437        if (distance > mMaxDistanceForFolderCreation) return false;
2438        View v = target.getChildAt(targetCell[0], targetCell[1]);
2439
2440        boolean hasntMoved = false;
2441        if (mDragInfo != null) {
2442            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2443            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2444                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2445        }
2446
2447        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2448        mCreateUserFolderOnDrop = false;
2449        final long screenId = getIdForScreen(target);
2450
2451        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2452        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2453
2454        if (aboveShortcut && willBecomeShortcut) {
2455            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2456            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2457            // if the drag started here, we need to remove it from the workspace
2458            if (!external) {
2459                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2460            }
2461
2462            Rect folderLocation = new Rect();
2463            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2464            target.removeView(v);
2465
2466            FolderIcon fi =
2467                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2468            destInfo.cellX = -1;
2469            destInfo.cellY = -1;
2470            sourceInfo.cellX = -1;
2471            sourceInfo.cellY = -1;
2472
2473            // If the dragView is null, we can't animate
2474            boolean animate = dragView != null;
2475            if (animate) {
2476                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2477                        postAnimationRunnable);
2478            } else {
2479                fi.addItem(destInfo);
2480                fi.addItem(sourceInfo);
2481            }
2482            return true;
2483        }
2484        return false;
2485    }
2486
2487    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2488            float distance, DragObject d, boolean external) {
2489        if (distance > mMaxDistanceForFolderCreation) return false;
2490
2491        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2492        if (!mAddToExistingFolderOnDrop) return false;
2493        mAddToExistingFolderOnDrop = false;
2494
2495        if (dropOverView instanceof FolderIcon) {
2496            FolderIcon fi = (FolderIcon) dropOverView;
2497            if (fi.acceptDrop(d.dragInfo)) {
2498                fi.onDrop(d);
2499
2500                // if the drag started here, we need to remove it from the workspace
2501                if (!external) {
2502                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2503                }
2504                return true;
2505            }
2506        }
2507        return false;
2508    }
2509
2510    @Override
2511    public void prepareAccessibilityDrop() { }
2512
2513    public void onDrop(final DragObject d) {
2514        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2515        CellLayout dropTargetLayout = mDropToLayout;
2516
2517        // We want the point to be mapped to the dragTarget.
2518        if (dropTargetLayout != null) {
2519            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2520                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2521            } else {
2522                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2523            }
2524        }
2525
2526        int snapScreen = -1;
2527        boolean resizeOnDrop = false;
2528        if (d.dragSource != this) {
2529            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2530                    (int) mDragViewVisualCenter[1] };
2531            onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d);
2532        } else if (mDragInfo != null) {
2533            final View cell = mDragInfo.cell;
2534
2535            if (dropTargetLayout != null && !d.cancelled) {
2536                // Move internally
2537                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2538                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2539                long container = hasMovedIntoHotseat ?
2540                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2541                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2542                long screenId = (mTargetCell[0] < 0) ?
2543                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2544                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2545                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2546                // First we find the cell nearest to point at which the item is
2547                // dropped, without any consideration to whether there is an item there.
2548
2549                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2550                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2551                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2552                        mDragViewVisualCenter[1], mTargetCell);
2553
2554                // If the item being dropped is a shortcut and the nearest drop
2555                // cell also contains a shortcut, then create a folder with the two shortcuts.
2556                if (!mInScrollArea && createUserFolderIfNecessary(cell, container,
2557                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2558                    return;
2559                }
2560
2561                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2562                        distance, d, false)) {
2563                    return;
2564                }
2565
2566                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2567                // we need to find the nearest cell location that is vacant
2568                ItemInfo item = d.dragInfo;
2569                int minSpanX = item.spanX;
2570                int minSpanY = item.spanY;
2571                if (item.minSpanX > 0 && item.minSpanY > 0) {
2572                    minSpanX = item.minSpanX;
2573                    minSpanY = item.minSpanY;
2574                }
2575
2576                int[] resultSpan = new int[2];
2577                mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2578                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2579                        mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2580
2581                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2582
2583                // if the widget resizes on drop
2584                if (foundCell && (cell instanceof AppWidgetHostView) &&
2585                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2586                    resizeOnDrop = true;
2587                    item.spanX = resultSpan[0];
2588                    item.spanY = resultSpan[1];
2589                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2590                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2591                            resultSpan[1]);
2592                }
2593
2594                if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2595                    snapScreen = getPageIndexForScreenId(screenId);
2596                    snapToPage(snapScreen);
2597                }
2598
2599                if (foundCell) {
2600                    final ItemInfo info = (ItemInfo) cell.getTag();
2601                    if (hasMovedLayouts) {
2602                        // Reparent the view
2603                        CellLayout parentCell = getParentCellLayoutForView(cell);
2604                        if (parentCell != null) {
2605                            parentCell.removeView(cell);
2606                        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
2607                            throw new NullPointerException("mDragInfo.cell has null parent");
2608                        }
2609                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2610                                info.spanX, info.spanY);
2611                    }
2612
2613                    // update the item's position after drop
2614                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2615                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2616                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2617                    lp.cellHSpan = item.spanX;
2618                    lp.cellVSpan = item.spanY;
2619                    lp.isLockedToGrid = true;
2620
2621                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2622                            cell instanceof LauncherAppWidgetHostView) {
2623                        final CellLayout cellLayout = dropTargetLayout;
2624                        // We post this call so that the widget has a chance to be placed
2625                        // in its final location
2626
2627                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2628                        AppWidgetProviderInfo pInfo = hostView.getAppWidgetInfo();
2629                        if (pInfo != null && pInfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE
2630                                && !d.accessibleDrag) {
2631                            mDelayedResizeRunnable = new Runnable() {
2632                                public void run() {
2633                                    if (!isPageMoving() && !mIsSwitchingState) {
2634                                        DragLayer dragLayer = mLauncher.getDragLayer();
2635                                        dragLayer.addResizeFrame(info, hostView, cellLayout);
2636                                    }
2637                                }
2638                            };
2639                        }
2640                    }
2641
2642                    LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, lp.cellX,
2643                            lp.cellY, item.spanX, item.spanY);
2644                } else {
2645                    // If we can't find a drop location, we return the item to its original position
2646                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2647                    mTargetCell[0] = lp.cellX;
2648                    mTargetCell[1] = lp.cellY;
2649                    CellLayout layout = (CellLayout) cell.getParent().getParent();
2650                    layout.markCellsAsOccupiedForView(cell);
2651                }
2652            }
2653
2654            final CellLayout parent = (CellLayout) cell.getParent().getParent();
2655            // Prepare it to be animated into its new position
2656            // This must be called after the view has been re-parented
2657            final Runnable onCompleteRunnable = new Runnable() {
2658                @Override
2659                public void run() {
2660                    mAnimatingViewIntoPlace = false;
2661                    updateChildrenLayersEnabled(false);
2662                }
2663            };
2664            mAnimatingViewIntoPlace = true;
2665            if (d.dragView.hasDrawn()) {
2666                final ItemInfo info = (ItemInfo) cell.getTag();
2667                boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
2668                        || info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
2669                if (isWidget) {
2670                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2671                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2672                    animateWidgetDrop(info, parent, d.dragView,
2673                            onCompleteRunnable, animationType, cell, false);
2674                } else {
2675                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2676                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2677                            onCompleteRunnable, this);
2678                }
2679            } else {
2680                d.deferDragViewCleanupPostAnimation = false;
2681                cell.setVisibility(VISIBLE);
2682            }
2683            parent.onDropChild(cell);
2684        }
2685    }
2686
2687    /**
2688     * Computes the area relative to dragLayer which is used to display a page.
2689     */
2690    public void getPageAreaRelativeToDragLayer(Rect outArea) {
2691        CellLayout child = (CellLayout) getChildAt(getNextPage());
2692        if (child == null) {
2693            return;
2694        }
2695        ShortcutAndWidgetContainer boundingLayout = child.getShortcutsAndWidgets();
2696
2697        // Use the absolute left instead of the child left, as we want the visible area
2698        // irrespective of the visible child. Since the view can only scroll horizontally, the
2699        // top position is not affected.
2700        mTempXY[0] = getViewportOffsetX() + getPaddingLeft() + boundingLayout.getLeft();
2701        mTempXY[1] = child.getTop() + boundingLayout.getTop();
2702
2703        float scale = mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY);
2704        outArea.set(mTempXY[0], mTempXY[1],
2705                (int) (mTempXY[0] + scale * boundingLayout.getMeasuredWidth()),
2706                (int) (mTempXY[1] + scale * boundingLayout.getMeasuredHeight()));
2707    }
2708
2709    @Override
2710    public void onDragEnter(DragObject d) {
2711        if (ENFORCE_DRAG_EVENT_ORDER) {
2712            enfoceDragParity("onDragEnter", 1, 1);
2713        }
2714
2715        mCreateUserFolderOnDrop = false;
2716        mAddToExistingFolderOnDrop = false;
2717
2718        mDropToLayout = null;
2719        CellLayout layout = getCurrentDropLayout();
2720        setCurrentDropLayout(layout);
2721        setCurrentDragOverlappingLayout(layout);
2722
2723        if (!workspaceInModalState() && FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND) {
2724            mLauncher.getDragLayer().showPageHints();
2725        }
2726    }
2727
2728    @Override
2729    public void onDragExit(DragObject d) {
2730        if (ENFORCE_DRAG_EVENT_ORDER) {
2731            enfoceDragParity("onDragExit", -1, 0);
2732        }
2733
2734        // Here we store the final page that will be dropped to, if the workspace in fact
2735        // receives the drop
2736        if (mInScrollArea) {
2737            if (isPageMoving()) {
2738                // If the user drops while the page is scrolling, we should use that page as the
2739                // destination instead of the page that is being hovered over.
2740                mDropToLayout = (CellLayout) getPageAt(getNextPage());
2741            } else {
2742                mDropToLayout = mDragOverlappingLayout;
2743            }
2744        } else {
2745            mDropToLayout = mDragTargetLayout;
2746        }
2747
2748        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2749            mCreateUserFolderOnDrop = true;
2750        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2751            mAddToExistingFolderOnDrop = true;
2752        }
2753
2754        // Reset the scroll area and previous drag target
2755        onResetScrollArea();
2756        setCurrentDropLayout(null);
2757        setCurrentDragOverlappingLayout(null);
2758
2759        mSpringLoadedDragController.cancel();
2760
2761        mLauncher.getDragLayer().hidePageHints();
2762    }
2763
2764    private void enfoceDragParity(String event, int update, int expectedValue) {
2765        enfoceDragParity(this, event, update, expectedValue);
2766        for (int i = 0; i < getChildCount(); i++) {
2767            enfoceDragParity(getChildAt(i), event, update, expectedValue);
2768        }
2769    }
2770
2771    private void enfoceDragParity(View v, String event, int update, int expectedValue) {
2772        Object tag = v.getTag(R.id.drag_event_parity);
2773        int value = tag == null ? 0 : (Integer) tag;
2774        value += update;
2775        v.setTag(R.id.drag_event_parity, value);
2776
2777        if (value != expectedValue) {
2778            Log.e(TAG, event + ": Drag contract violated: " + value);
2779        }
2780    }
2781
2782    void setCurrentDropLayout(CellLayout layout) {
2783        if (mDragTargetLayout != null) {
2784            mDragTargetLayout.revertTempState();
2785            mDragTargetLayout.onDragExit();
2786        }
2787        mDragTargetLayout = layout;
2788        if (mDragTargetLayout != null) {
2789            mDragTargetLayout.onDragEnter();
2790        }
2791        cleanupReorder(true);
2792        cleanupFolderCreation();
2793        setCurrentDropOverCell(-1, -1);
2794    }
2795
2796    void setCurrentDragOverlappingLayout(CellLayout layout) {
2797        if (mDragOverlappingLayout != null) {
2798            mDragOverlappingLayout.setIsDragOverlapping(false);
2799        }
2800        mDragOverlappingLayout = layout;
2801        if (mDragOverlappingLayout != null) {
2802            mDragOverlappingLayout.setIsDragOverlapping(true);
2803        }
2804        invalidate();
2805    }
2806
2807    void setCurrentDropOverCell(int x, int y) {
2808        if (x != mDragOverX || y != mDragOverY) {
2809            mDragOverX = x;
2810            mDragOverY = y;
2811            setDragMode(DRAG_MODE_NONE);
2812        }
2813    }
2814
2815    void setDragMode(int dragMode) {
2816        if (dragMode != mDragMode) {
2817            if (dragMode == DRAG_MODE_NONE) {
2818                cleanupAddToFolder();
2819                // We don't want to cancel the re-order alarm every time the target cell changes
2820                // as this feels to slow / unresponsive.
2821                cleanupReorder(false);
2822                cleanupFolderCreation();
2823            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2824                cleanupReorder(true);
2825                cleanupFolderCreation();
2826            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2827                cleanupAddToFolder();
2828                cleanupReorder(true);
2829            } else if (dragMode == DRAG_MODE_REORDER) {
2830                cleanupAddToFolder();
2831                cleanupFolderCreation();
2832            }
2833            mDragMode = dragMode;
2834        }
2835    }
2836
2837    private void cleanupFolderCreation() {
2838        if (mDragFolderRingAnimator != null) {
2839            mDragFolderRingAnimator.animateToNaturalState();
2840            mDragFolderRingAnimator = null;
2841        }
2842        mFolderCreationAlarm.setOnAlarmListener(null);
2843        mFolderCreationAlarm.cancelAlarm();
2844    }
2845
2846    private void cleanupAddToFolder() {
2847        if (mDragOverFolderIcon != null) {
2848            mDragOverFolderIcon.onDragExit(null);
2849            mDragOverFolderIcon = null;
2850        }
2851    }
2852
2853    private void cleanupReorder(boolean cancelAlarm) {
2854        // Any pending reorders are canceled
2855        if (cancelAlarm) {
2856            mReorderAlarm.cancelAlarm();
2857        }
2858        mLastReorderX = -1;
2859        mLastReorderY = -1;
2860    }
2861
2862   /*
2863    *
2864    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
2865    * coordinate space. The argument xy is modified with the return result.
2866    */
2867   void mapPointFromSelfToChild(View v, float[] xy) {
2868       xy[0] = xy[0] - v.getLeft();
2869       xy[1] = xy[1] - v.getTop();
2870   }
2871
2872   boolean isPointInSelfOverHotseat(int x, int y) {
2873       mTempXY[0] = x;
2874       mTempXY[1] = y;
2875       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2876       return mLauncher.getDeviceProfile().isInHotseatRect(mTempXY[0], mTempXY[1]);
2877   }
2878
2879   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
2880       mTempXY[0] = (int) xy[0];
2881       mTempXY[1] = (int) xy[1];
2882       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2883       mLauncher.getDragLayer().mapCoordInSelfToDescendent(hotseat.getLayout(), mTempXY);
2884
2885       xy[0] = mTempXY[0];
2886       xy[1] = mTempXY[1];
2887   }
2888
2889   /*
2890    *
2891    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
2892    * the parent View's coordinate space. The argument xy is modified with the return result.
2893    *
2894    */
2895   void mapPointFromChildToSelf(View v, float[] xy) {
2896       xy[0] += v.getLeft();
2897       xy[1] += v.getTop();
2898   }
2899
2900   static private float squaredDistance(float[] point1, float[] point2) {
2901        float distanceX = point1[0] - point2[0];
2902        float distanceY = point2[1] - point2[1];
2903        return distanceX * distanceX + distanceY * distanceY;
2904   }
2905
2906    /*
2907     *
2908     * This method returns the CellLayout that is currently being dragged to. In order to drag
2909     * to a CellLayout, either the touch point must be directly over the CellLayout, or as a second
2910     * strategy, we see if the dragView is overlapping any CellLayout and choose the closest one
2911     *
2912     * Return null if no CellLayout is currently being dragged over
2913     *
2914     */
2915    private CellLayout findMatchingPageForDragOver(
2916            DragView dragView, float originX, float originY, boolean exact) {
2917        // We loop through all the screens (ie CellLayouts) and see which ones overlap
2918        // with the item being dragged and then choose the one that's closest to the touch point
2919        final int screenCount = getChildCount();
2920        CellLayout bestMatchingScreen = null;
2921        float smallestDistSoFar = Float.MAX_VALUE;
2922
2923        for (int i = 0; i < screenCount; i++) {
2924            // The custom content screen is not a valid drag over option
2925            if (mScreenOrder.get(i) == CUSTOM_CONTENT_SCREEN_ID) {
2926                continue;
2927            }
2928
2929            CellLayout cl = (CellLayout) getChildAt(i);
2930
2931            final float[] touchXy = {originX, originY};
2932            mapPointFromSelfToChild(cl, touchXy);
2933
2934            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
2935                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
2936                return cl;
2937            }
2938
2939            if (!exact) {
2940                // Get the center of the cell layout in screen coordinates
2941                final float[] cellLayoutCenter = mTempCellLayoutCenterCoordinates;
2942                cellLayoutCenter[0] = cl.getWidth()/2;
2943                cellLayoutCenter[1] = cl.getHeight()/2;
2944                mapPointFromChildToSelf(cl, cellLayoutCenter);
2945
2946                touchXy[0] = originX;
2947                touchXy[1] = originY;
2948
2949                // Calculate the distance between the center of the CellLayout
2950                // and the touch point
2951                float dist = squaredDistance(touchXy, cellLayoutCenter);
2952
2953                if (dist < smallestDistSoFar) {
2954                    smallestDistSoFar = dist;
2955                    bestMatchingScreen = cl;
2956                }
2957            }
2958        }
2959        return bestMatchingScreen;
2960    }
2961
2962    private boolean isDragWidget(DragObject d) {
2963        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
2964                d.dragInfo instanceof PendingAddWidgetInfo);
2965    }
2966    private boolean isExternalDragWidget(DragObject d) {
2967        return d.dragSource != this && isDragWidget(d);
2968    }
2969
2970    public void onDragOver(DragObject d) {
2971        // Skip drag over events while we are dragging over side pages
2972        if (mInScrollArea || !transitionStateShouldAllowDrop()) return;
2973
2974        CellLayout layout = null;
2975        ItemInfo item = d.dragInfo;
2976        if (item == null) {
2977            if (ProviderConfig.IS_DOGFOOD_BUILD) {
2978                throw new NullPointerException("DragObject has null info");
2979            }
2980            return;
2981        }
2982
2983        // Ensure that we have proper spans for the item that we are dropping
2984        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
2985        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2986
2987        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
2988        // Identify whether we have dragged over a side page
2989        if (workspaceInModalState()) {
2990            if (mLauncher.getHotseat() != null && !isExternalDragWidget(d)) {
2991                if (isPointInSelfOverHotseat(d.x, d.y)) {
2992                    layout = mLauncher.getHotseat().getLayout();
2993                }
2994            }
2995            if (layout == null) {
2996                layout = findMatchingPageForDragOver(d.dragView, d.x, d.y, false);
2997            }
2998            if (layout != mDragTargetLayout) {
2999                setCurrentDropLayout(layout);
3000                setCurrentDragOverlappingLayout(layout);
3001
3002                boolean isInSpringLoadedMode = (mState == State.SPRING_LOADED);
3003                if (isInSpringLoadedMode) {
3004                    if (mLauncher.isHotseatLayout(layout)) {
3005                        mSpringLoadedDragController.cancel();
3006                    } else {
3007                        mSpringLoadedDragController.setAlarm(mDragTargetLayout);
3008                    }
3009                }
3010            }
3011        } else {
3012            // Test to see if we are over the hotseat otherwise just use the current page
3013            if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3014                if (isPointInSelfOverHotseat(d.x, d.y)) {
3015                    layout = mLauncher.getHotseat().getLayout();
3016                }
3017            }
3018            if (layout == null) {
3019                layout = getCurrentDropLayout();
3020            }
3021            if (layout != mDragTargetLayout) {
3022                setCurrentDropLayout(layout);
3023                setCurrentDragOverlappingLayout(layout);
3024            }
3025        }
3026
3027        // Handle the drag over
3028        if (mDragTargetLayout != null) {
3029            // We want the point to be mapped to the dragTarget.
3030            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3031                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
3032            } else {
3033                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter);
3034            }
3035
3036            int minSpanX = item.spanX;
3037            int minSpanY = item.spanY;
3038            if (item.minSpanX > 0 && item.minSpanY > 0) {
3039                minSpanX = item.minSpanX;
3040                minSpanY = item.minSpanY;
3041            }
3042
3043            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3044                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY,
3045                    mDragTargetLayout, mTargetCell);
3046            int reorderX = mTargetCell[0];
3047            int reorderY = mTargetCell[1];
3048
3049            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
3050
3051            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
3052                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
3053
3054            manageFolderFeedback(mDragTargetLayout, mTargetCell, targetCellDistance, d);
3055
3056            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3057                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3058                    item.spanY, child, mTargetCell);
3059
3060            if (!nearestDropOccupied) {
3061                mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3062                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false, d);
3063            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3064                    && !mReorderAlarm.alarmPending() && (mLastReorderX != reorderX ||
3065                    mLastReorderY != reorderY)) {
3066
3067                int[] resultSpan = new int[2];
3068                mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3069                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, item.spanX, item.spanY,
3070                        child, mTargetCell, resultSpan, CellLayout.MODE_SHOW_REORDER_HINT);
3071
3072                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3073                // reorder, then we schedule a reorder
3074                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3075                        minSpanX, minSpanY, item.spanX, item.spanY, d, child);
3076                mReorderAlarm.setOnAlarmListener(listener);
3077                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3078            }
3079
3080            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3081                    !nearestDropOccupied) {
3082                if (mDragTargetLayout != null) {
3083                    mDragTargetLayout.revertTempState();
3084                }
3085            }
3086        }
3087    }
3088
3089    private void manageFolderFeedback(CellLayout targetLayout,
3090            int[] targetCell, float distance, DragObject dragObject) {
3091        if (distance > mMaxDistanceForFolderCreation) return;
3092
3093        final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0], mTargetCell[1]);
3094        ItemInfo info = dragObject.dragInfo;
3095        boolean userFolderPending = willCreateUserFolder(info, dragOverView, false);
3096        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3097                !mFolderCreationAlarm.alarmPending()) {
3098
3099            FolderCreationAlarmListener listener = new
3100                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]);
3101
3102            if (!dragObject.accessibleDrag) {
3103                mFolderCreationAlarm.setOnAlarmListener(listener);
3104                mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3105            } else {
3106                listener.onAlarm(mFolderCreationAlarm);
3107            }
3108
3109            if (dragObject.stateAnnouncer != null) {
3110                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3111                        .getDescriptionForDropOver(dragOverView, getContext()));
3112            }
3113            return;
3114        }
3115
3116        boolean willAddToFolder = willAddToExistingUserFolder(info, dragOverView);
3117        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3118            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3119            mDragOverFolderIcon.onDragEnter(info);
3120            if (targetLayout != null) {
3121                targetLayout.clearDragOutlines();
3122            }
3123            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3124
3125            if (dragObject.stateAnnouncer != null) {
3126                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3127                        .getDescriptionForDropOver(dragOverView, getContext()));
3128            }
3129            return;
3130        }
3131
3132        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3133            setDragMode(DRAG_MODE_NONE);
3134        }
3135        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3136            setDragMode(DRAG_MODE_NONE);
3137        }
3138    }
3139
3140    class FolderCreationAlarmListener implements OnAlarmListener {
3141        CellLayout layout;
3142        int cellX;
3143        int cellY;
3144
3145        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3146            this.layout = layout;
3147            this.cellX = cellX;
3148            this.cellY = cellY;
3149        }
3150
3151        public void onAlarm(Alarm alarm) {
3152            if (mDragFolderRingAnimator != null) {
3153                // This shouldn't happen ever, but just in case, make sure we clean up the mess.
3154                mDragFolderRingAnimator.animateToNaturalState();
3155            }
3156            mDragFolderRingAnimator = new FolderRingAnimator(mLauncher, null);
3157            mDragFolderRingAnimator.setCell(cellX, cellY);
3158            mDragFolderRingAnimator.setCellLayout(layout);
3159            mDragFolderRingAnimator.animateToAcceptState();
3160            layout.showFolderAccept(mDragFolderRingAnimator);
3161            layout.clearDragOutlines();
3162            setDragMode(DRAG_MODE_CREATE_FOLDER);
3163        }
3164    }
3165
3166    class ReorderAlarmListener implements OnAlarmListener {
3167        float[] dragViewCenter;
3168        int minSpanX, minSpanY, spanX, spanY;
3169        DragObject dragObject;
3170        View child;
3171
3172        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3173                int spanY, DragObject dragObject, View child) {
3174            this.dragViewCenter = dragViewCenter;
3175            this.minSpanX = minSpanX;
3176            this.minSpanY = minSpanY;
3177            this.spanX = spanX;
3178            this.spanY = spanY;
3179            this.child = child;
3180            this.dragObject = dragObject;
3181        }
3182
3183        public void onAlarm(Alarm alarm) {
3184            int[] resultSpan = new int[2];
3185            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3186                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, mDragTargetLayout,
3187                    mTargetCell);
3188            mLastReorderX = mTargetCell[0];
3189            mLastReorderY = mTargetCell[1];
3190
3191            mTargetCell = mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3192                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3193                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3194
3195            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3196                mDragTargetLayout.revertTempState();
3197            } else {
3198                setDragMode(DRAG_MODE_REORDER);
3199            }
3200
3201            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3202            mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3203                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize, dragObject);
3204        }
3205    }
3206
3207    @Override
3208    public void getHitRectRelativeToDragLayer(Rect outRect) {
3209        // We want the workspace to have the whole area of the display (it will find the correct
3210        // cell layout to drop to in the existing drag/drop logic.
3211        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3212    }
3213
3214    /**
3215     * Drop an item that didn't originate on one of the workspace screens.
3216     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3217     * come from another app altogether.
3218     *
3219     * NOTE: This can also be called when we are outside of a drag event, when we want
3220     * to add an item to one of the workspace screens.
3221     */
3222    private void onDropExternal(final int[] touchXY, final ItemInfo dragInfo,
3223            final CellLayout cellLayout, boolean insertAtFirst, DragObject d) {
3224        final Runnable exitSpringLoadedRunnable = new Runnable() {
3225            @Override
3226            public void run() {
3227                mLauncher.exitSpringLoadedDragModeDelayed(true,
3228                        Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
3229            }
3230        };
3231
3232        ItemInfo info = dragInfo;
3233        int spanX = info.spanX;
3234        int spanY = info.spanY;
3235        if (mDragInfo != null) {
3236            spanX = mDragInfo.spanX;
3237            spanY = mDragInfo.spanY;
3238        }
3239
3240        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3241                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3242                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3243        final long screenId = getIdForScreen(cellLayout);
3244        if (!mLauncher.isHotseatLayout(cellLayout)
3245                && screenId != getScreenIdForPageIndex(mCurrentPage)
3246                && mState != State.SPRING_LOADED) {
3247            snapToScreenId(screenId, null);
3248        }
3249
3250        if (info instanceof PendingAddItemInfo) {
3251            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo;
3252
3253            boolean findNearestVacantCell = true;
3254            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3255                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3256                        cellLayout, mTargetCell);
3257                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3258                        mDragViewVisualCenter[1], mTargetCell);
3259                if (willCreateUserFolder(d.dragInfo, cellLayout, mTargetCell, distance, true)
3260                        || willAddToExistingUserFolder(
3261                                d.dragInfo, cellLayout, mTargetCell, distance)) {
3262                    findNearestVacantCell = false;
3263                }
3264            }
3265
3266            final ItemInfo item = d.dragInfo;
3267            boolean updateWidgetSize = false;
3268            if (findNearestVacantCell) {
3269                int minSpanX = item.spanX;
3270                int minSpanY = item.spanY;
3271                if (item.minSpanX > 0 && item.minSpanY > 0) {
3272                    minSpanX = item.minSpanX;
3273                    minSpanY = item.minSpanY;
3274                }
3275                int[] resultSpan = new int[2];
3276                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3277                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3278                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3279
3280                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3281                    updateWidgetSize = true;
3282                }
3283                item.spanX = resultSpan[0];
3284                item.spanY = resultSpan[1];
3285            }
3286
3287            Runnable onAnimationCompleteRunnable = new Runnable() {
3288                @Override
3289                public void run() {
3290                    // Normally removeExtraEmptyScreen is called in Workspace#onDragEnd, but when
3291                    // adding an item that may not be dropped right away (due to a config activity)
3292                    // we defer the removal until the activity returns.
3293                    deferRemoveExtraEmptyScreen();
3294
3295                    // When dragging and dropping from customization tray, we deal with creating
3296                    // widgets/shortcuts/folders in a slightly different way
3297                    mLauncher.addPendingItem(pendingInfo, container, screenId, mTargetCell,
3298                            item.spanX, item.spanY);
3299                }
3300            };
3301            boolean isWidget = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3302                    || pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3303
3304            AppWidgetHostView finalView = isWidget ?
3305                    ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3306
3307            if (finalView != null && updateWidgetSize) {
3308                AppWidgetResizeFrame.updateWidgetSizeRanges(finalView, mLauncher, item.spanX,
3309                        item.spanY);
3310            }
3311
3312            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3313            if (isWidget && ((PendingAddWidgetInfo) pendingInfo).info != null &&
3314                    ((PendingAddWidgetInfo) pendingInfo).info.configure != null) {
3315                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3316            }
3317            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3318                    animationStyle, finalView, true);
3319        } else {
3320            // This is for other drag/drop cases, like dragging from All Apps
3321            View view = null;
3322
3323            switch (info.itemType) {
3324            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3325            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3326                if (info.container == NO_ID && info instanceof AppInfo) {
3327                    // Came from all apps -- make a copy
3328                    info = ((AppInfo) info).makeShortcut();
3329                }
3330                view = mLauncher.createShortcut(cellLayout, (ShortcutInfo) info);
3331                break;
3332            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3333                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3334                        (FolderInfo) info, mIconCache);
3335                break;
3336            default:
3337                throw new IllegalStateException("Unknown item type: " + info.itemType);
3338            }
3339
3340            // First we find the cell nearest to point at which the item is
3341            // dropped, without any consideration to whether there is an item there.
3342            if (touchXY != null) {
3343                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3344                        cellLayout, mTargetCell);
3345                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3346                        mDragViewVisualCenter[1], mTargetCell);
3347                d.postAnimationRunnable = exitSpringLoadedRunnable;
3348                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3349                        true, d.dragView, d.postAnimationRunnable)) {
3350                    return;
3351                }
3352                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3353                        true)) {
3354                    return;
3355                }
3356            }
3357
3358            if (touchXY != null) {
3359                // when dragging and dropping, just find the closest free spot
3360                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3361                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3362                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3363            } else {
3364                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3365            }
3366            // Add the item to DB before adding to screen ensures that the container and other
3367            // values of the info is properly updated.
3368            LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId,
3369                    mTargetCell[0], mTargetCell[1]);
3370
3371            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1], info.spanX,
3372                    info.spanY, insertAtFirst);
3373            cellLayout.onDropChild(view);
3374            cellLayout.getShortcutsAndWidgets().measureChild(view);
3375
3376            if (d.dragView != null) {
3377                // We wrap the animation call in the temporary set and reset of the current
3378                // cellLayout to its final transform -- this means we animate the drag view to
3379                // the correct final location.
3380                setFinalTransitionTransform(cellLayout);
3381                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3382                        exitSpringLoadedRunnable, this);
3383                resetTransitionTransform(cellLayout);
3384            }
3385        }
3386    }
3387
3388    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3389        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo, false);
3390        int visibility = layout.getVisibility();
3391        layout.setVisibility(VISIBLE);
3392
3393        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3394        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3395        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3396                Bitmap.Config.ARGB_8888);
3397        mCanvas.setBitmap(b);
3398
3399        layout.measure(width, height);
3400        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3401        layout.draw(mCanvas);
3402        mCanvas.setBitmap(null);
3403        layout.setVisibility(visibility);
3404        return b;
3405    }
3406
3407    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3408            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell, boolean scale) {
3409        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3410        // location and size on the home screen.
3411        int spanX = info.spanX;
3412        int spanY = info.spanY;
3413
3414        Rect r = estimateItemPosition(layout, targetCell[0], targetCell[1], spanX, spanY);
3415        loc[0] = r.left;
3416        loc[1] = r.top;
3417
3418        setFinalTransitionTransform(layout);
3419        float cellLayoutScale =
3420                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3421        resetTransitionTransform(layout);
3422
3423        float dragViewScaleX;
3424        float dragViewScaleY;
3425        if (scale) {
3426            dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3427            dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3428        } else {
3429            dragViewScaleX = 1f;
3430            dragViewScaleY = 1f;
3431        }
3432
3433        // The animation will scale the dragView about its center, so we need to center about
3434        // the final location.
3435        loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2
3436                - Math.ceil(layout.getUnusedHorizontalSpace() / 2f);
3437        loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3438
3439        scaleXY[0] = dragViewScaleX * cellLayoutScale;
3440        scaleXY[1] = dragViewScaleY * cellLayoutScale;
3441    }
3442
3443    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, final DragView dragView,
3444            final Runnable onCompleteRunnable, int animationType, final View finalView,
3445            boolean external) {
3446        Rect from = new Rect();
3447        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3448
3449        int[] finalPos = new int[2];
3450        float scaleXY[] = new float[2];
3451        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3452        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3453                scalePreview);
3454
3455        Resources res = mLauncher.getResources();
3456        final int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3457
3458        boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET ||
3459                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3460        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3461            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3462            dragView.setCrossFadeBitmap(crossFadeBitmap);
3463            dragView.crossFade((int) (duration * 0.8f));
3464        } else if (isWidget && external) {
3465            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3466        }
3467
3468        DragLayer dragLayer = mLauncher.getDragLayer();
3469        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3470            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3471                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3472        } else {
3473            int endStyle;
3474            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3475                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3476            } else {
3477                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;
3478            }
3479
3480            Runnable onComplete = new Runnable() {
3481                @Override
3482                public void run() {
3483                    if (finalView != null) {
3484                        finalView.setVisibility(VISIBLE);
3485                    }
3486                    if (onCompleteRunnable != null) {
3487                        onCompleteRunnable.run();
3488                    }
3489                }
3490            };
3491            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3492                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3493                    duration, this);
3494        }
3495    }
3496
3497    public void setFinalTransitionTransform(CellLayout layout) {
3498        if (isSwitchingState()) {
3499            mCurrentScale = getScaleX();
3500            setScaleX(mStateTransitionAnimation.getFinalScale());
3501            setScaleY(mStateTransitionAnimation.getFinalScale());
3502        }
3503    }
3504    public void resetTransitionTransform(CellLayout layout) {
3505        if (isSwitchingState()) {
3506            setScaleX(mCurrentScale);
3507            setScaleY(mCurrentScale);
3508        }
3509    }
3510
3511    /**
3512     * Return the current {@link CellLayout}, correctly picking the destination
3513     * screen while a scroll is in progress.
3514     */
3515    public CellLayout getCurrentDropLayout() {
3516        return (CellLayout) getChildAt(getNextPage());
3517    }
3518
3519    /**
3520     * Return the current CellInfo describing our current drag; this method exists
3521     * so that Launcher can sync this object with the correct info when the activity is created/
3522     * destroyed
3523     *
3524     */
3525    public CellLayout.CellInfo getDragInfo() {
3526        return mDragInfo;
3527    }
3528
3529    public int getCurrentPageOffsetFromCustomContent() {
3530        return getNextPage() - numCustomPages();
3531    }
3532
3533    /**
3534     * Calculate the nearest cell where the given object would be dropped.
3535     *
3536     * pixelX and pixelY should be in the coordinate system of layout
3537     */
3538    @Thunk int[] findNearestArea(int pixelX, int pixelY,
3539            int spanX, int spanY, CellLayout layout, int[] recycle) {
3540        return layout.findNearestArea(
3541                pixelX, pixelY, spanX, spanY, recycle);
3542    }
3543
3544    void setup(DragController dragController) {
3545        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3546        mDragController = dragController;
3547
3548        // hardware layers on children are enabled on startup, but should be disabled until
3549        // needed
3550        updateChildrenLayersEnabled(false);
3551    }
3552
3553    /**
3554     * Called at the end of a drag which originated on the workspace.
3555     */
3556    public void onDropCompleted(final View target, final DragObject d,
3557            final boolean isFlingToDelete, final boolean success) {
3558        if (mDeferDropAfterUninstall) {
3559            mDeferredAction = new Runnable() {
3560                public void run() {
3561                    onDropCompleted(target, d, isFlingToDelete, success);
3562                    mDeferredAction = null;
3563                }
3564            };
3565            return;
3566        }
3567
3568        boolean beingCalledAfterUninstall = mDeferredAction != null;
3569
3570        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3571            if (target != this && mDragInfo != null) {
3572                removeWorkspaceItem(mDragInfo.cell);
3573            }
3574        } else if (mDragInfo != null) {
3575            final CellLayout cellLayout = mLauncher.getCellLayout(
3576                    mDragInfo.container, mDragInfo.screenId);
3577            if (cellLayout != null) {
3578                cellLayout.onDropChild(mDragInfo.cell);
3579            } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3580                throw new RuntimeException("Invalid state: cellLayout == null in "
3581                        + "Workspace#onDropCompleted. Please file a bug. ");
3582            };
3583        }
3584        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3585                && mDragInfo.cell != null) {
3586            mDragInfo.cell.setVisibility(VISIBLE);
3587        }
3588        mDragOutline = null;
3589        mDragInfo = null;
3590
3591        if (!isFlingToDelete) {
3592            // Fling to delete already exits spring loaded mode after the animation finishes.
3593            mLauncher.exitSpringLoadedDragModeDelayed(success,
3594                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, mDelayedResizeRunnable);
3595            mDelayedResizeRunnable = null;
3596        }
3597    }
3598
3599    /**
3600     * For opposite operation. See {@link #addInScreen}.
3601     */
3602    public void removeWorkspaceItem(View v) {
3603        CellLayout parentCell = getParentCellLayoutForView(v);
3604        if (parentCell != null) {
3605            parentCell.removeView(v);
3606        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3607            // When an app is uninstalled using the drop target, we wait until resume to remove
3608            // the icon. We also remove all the corresponding items from the workspace at
3609            // {@link Launcher#bindComponentsRemoved}. That call can come before or after
3610            // {@link Launcher#mOnResumeCallbacks} depending on how busy the worker thread is.
3611            Log.e(TAG, "mDragInfo.cell has null parent");
3612        }
3613        if (v instanceof DropTarget) {
3614            mDragController.removeDropTarget((DropTarget) v);
3615        }
3616    }
3617
3618    @Override
3619    public void deferCompleteDropAfterUninstallActivity() {
3620        mDeferDropAfterUninstall = true;
3621    }
3622
3623    /// maybe move this into a smaller part
3624    @Override
3625    public void onUninstallActivityReturned(boolean success) {
3626        mDeferDropAfterUninstall = false;
3627        mUninstallSuccessful = success;
3628        if (mDeferredAction != null) {
3629            mDeferredAction.run();
3630        }
3631    }
3632
3633    @Override
3634    public float getIntrinsicIconScaleFactor() {
3635        return 1f;
3636    }
3637
3638    @Override
3639    public boolean supportsFlingToDelete() {
3640        return true;
3641    }
3642
3643    @Override
3644    public boolean supportsAppInfoDropTarget() {
3645        return !FeatureFlags.LAUNCHER3_LEGACY_WORKSPACE_DND;
3646    }
3647
3648    @Override
3649    public boolean supportsDeleteDropTarget() {
3650        return true;
3651    }
3652
3653    @Override
3654    public void onFlingToDelete(DragObject d, PointF vec) {
3655        // Do nothing
3656    }
3657
3658    @Override
3659    public void onFlingToDeleteCompleted() {
3660        // Do nothing
3661    }
3662
3663    public boolean isDropEnabled() {
3664        return true;
3665    }
3666
3667    @Override
3668    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
3669        // We don't dispatch restoreInstanceState to our children using this code path.
3670        // Some pages will be restored immediately as their items are bound immediately, and
3671        // others we will need to wait until after their items are bound.
3672        mSavedStates = container;
3673    }
3674
3675    public void restoreInstanceStateForChild(int child) {
3676        if (mSavedStates != null) {
3677            mRestoredPages.add(child);
3678            CellLayout cl = (CellLayout) getChildAt(child);
3679            if (cl != null) {
3680                cl.restoreInstanceState(mSavedStates);
3681            }
3682        }
3683    }
3684
3685    public void restoreInstanceStateForRemainingPages() {
3686        int count = getChildCount();
3687        for (int i = 0; i < count; i++) {
3688            if (!mRestoredPages.contains(i)) {
3689                restoreInstanceStateForChild(i);
3690            }
3691        }
3692        mRestoredPages.clear();
3693        mSavedStates = null;
3694    }
3695
3696    @Override
3697    public void scrollLeft() {
3698        if (!workspaceInModalState() && !mIsSwitchingState) {
3699            super.scrollLeft();
3700        }
3701        Folder openFolder = getOpenFolder();
3702        if (openFolder != null) {
3703            openFolder.completeDragExit();
3704        }
3705    }
3706
3707    @Override
3708    public void scrollRight() {
3709        if (!workspaceInModalState() && !mIsSwitchingState) {
3710            super.scrollRight();
3711        }
3712        Folder openFolder = getOpenFolder();
3713        if (openFolder != null) {
3714            openFolder.completeDragExit();
3715        }
3716    }
3717
3718    @Override
3719    public boolean onEnterScrollArea(int x, int y, int direction) {
3720        // Ignore the scroll area if we are dragging over the hot seat
3721        boolean isPortrait = !mLauncher.getDeviceProfile().isLandscape;
3722        if (mLauncher.getHotseat() != null && isPortrait) {
3723            Rect r = new Rect();
3724            mLauncher.getHotseat().getHitRect(r);
3725            if (r.contains(x, y)) {
3726                return false;
3727            }
3728        }
3729
3730        boolean result = false;
3731        if (!workspaceInModalState() && !mIsSwitchingState && getOpenFolder() == null) {
3732            mInScrollArea = true;
3733
3734            final int page = getNextPage() +
3735                       (direction == DragController.SCROLL_LEFT ? -1 : 1);
3736            // We always want to exit the current layout to ensure parity of enter / exit
3737            setCurrentDropLayout(null);
3738
3739            if (0 <= page && page < getChildCount()) {
3740                // Ensure that we are not dragging over to the custom content screen
3741                if (getScreenIdForPageIndex(page) == CUSTOM_CONTENT_SCREEN_ID) {
3742                    return false;
3743                }
3744
3745                CellLayout layout = (CellLayout) getChildAt(page);
3746                setCurrentDragOverlappingLayout(layout);
3747
3748                // Workspace is responsible for drawing the edge glow on adjacent pages,
3749                // so we need to redraw the workspace when this may have changed.
3750                invalidate();
3751                result = true;
3752            }
3753        }
3754        return result;
3755    }
3756
3757    @Override
3758    public boolean onExitScrollArea() {
3759        boolean result = false;
3760        if (mInScrollArea) {
3761            invalidate();
3762            CellLayout layout = getCurrentDropLayout();
3763            setCurrentDropLayout(layout);
3764            setCurrentDragOverlappingLayout(layout);
3765
3766            result = true;
3767            mInScrollArea = false;
3768        }
3769        return result;
3770    }
3771
3772    private void onResetScrollArea() {
3773        setCurrentDragOverlappingLayout(null);
3774        mInScrollArea = false;
3775    }
3776
3777    /**
3778     * Returns a specific CellLayout
3779     */
3780    CellLayout getParentCellLayoutForView(View v) {
3781        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
3782        for (CellLayout layout : layouts) {
3783            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
3784                return layout;
3785            }
3786        }
3787        return null;
3788    }
3789
3790    /**
3791     * Returns a list of all the CellLayouts in the workspace.
3792     */
3793    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
3794        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
3795        int screenCount = getChildCount();
3796        for (int screen = 0; screen < screenCount; screen++) {
3797            layouts.add(((CellLayout) getChildAt(screen)));
3798        }
3799        if (mLauncher.getHotseat() != null) {
3800            layouts.add(mLauncher.getHotseat().getLayout());
3801        }
3802        return layouts;
3803    }
3804
3805    /**
3806     * We should only use this to search for specific children.  Do not use this method to modify
3807     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
3808     * the hotseat and workspace pages
3809     */
3810    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
3811        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = new ArrayList<>();
3812        int screenCount = getChildCount();
3813        for (int screen = 0; screen < screenCount; screen++) {
3814            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
3815        }
3816        if (mLauncher.getHotseat() != null) {
3817            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
3818        }
3819        return childrenLayouts;
3820    }
3821
3822    public View getHomescreenIconByItemId(final long id) {
3823        return getFirstMatch(new ItemOperator() {
3824
3825            @Override
3826            public boolean evaluate(ItemInfo info, View v, View parent) {
3827                return info != null && info.id == id;
3828            }
3829        });
3830    }
3831
3832    public View getViewForTag(final Object tag) {
3833        return getFirstMatch(new ItemOperator() {
3834
3835            @Override
3836            public boolean evaluate(ItemInfo info, View v, View parent) {
3837                return info == tag;
3838            }
3839        });
3840    }
3841
3842    public LauncherAppWidgetHostView getWidgetForAppWidgetId(final int appWidgetId) {
3843        return (LauncherAppWidgetHostView) getFirstMatch(new ItemOperator() {
3844
3845            @Override
3846            public boolean evaluate(ItemInfo info, View v, View parent) {
3847                return (info instanceof LauncherAppWidgetInfo) &&
3848                        ((LauncherAppWidgetInfo) info).appWidgetId == appWidgetId;
3849            }
3850        });
3851    }
3852
3853    private View getFirstMatch(final ItemOperator operator) {
3854        final View[] value = new View[1];
3855        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3856            @Override
3857            public boolean evaluate(ItemInfo info, View v, View parent) {
3858                if (operator.evaluate(info, v, parent)) {
3859                    value[0] = v;
3860                    return true;
3861                }
3862                return false;
3863            }
3864        });
3865        return value[0];
3866    }
3867
3868    void clearDropTargets() {
3869        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3870            @Override
3871            public boolean evaluate(ItemInfo info, View v, View parent) {
3872                if (v instanceof DropTarget) {
3873                    mDragController.removeDropTarget((DropTarget) v);
3874                }
3875                // not done, process all the shortcuts
3876                return false;
3877            }
3878        });
3879    }
3880
3881    public void disableShortcutsByPackageName(final ArrayList<String> packages,
3882            final UserHandleCompat user, final int reason) {
3883        final HashSet<String> packageNames = new HashSet<String>();
3884        packageNames.addAll(packages);
3885
3886        mapOverItems(MAP_RECURSE, new ItemOperator() {
3887            @Override
3888            public boolean evaluate(ItemInfo info, View v, View parent) {
3889                if (info instanceof ShortcutInfo && v instanceof BubbleTextView) {
3890                    ShortcutInfo shortcutInfo = (ShortcutInfo) info;
3891                    ComponentName cn = shortcutInfo.getTargetComponent();
3892                    if (user.equals(shortcutInfo.user) && cn != null
3893                            && packageNames.contains(cn.getPackageName())) {
3894                        shortcutInfo.isDisabled |= reason;
3895                        BubbleTextView shortcut = (BubbleTextView) v;
3896                        shortcut.applyFromShortcutInfo(shortcutInfo, mIconCache);
3897
3898                        if (parent != null) {
3899                            parent.invalidate();
3900                        }
3901                    }
3902                }
3903                // process all the shortcuts
3904                return false;
3905            }
3906        });
3907    }
3908
3909    // Removes ALL items that match a given package name, this is usually called when a package
3910    // has been removed and we want to remove all components (widgets, shortcuts, apps) that
3911    // belong to that package.
3912    void removeItemsByPackageName(final ArrayList<String> packages, final UserHandleCompat user) {
3913        final HashSet<String> packageNames = new HashSet<String>();
3914        packageNames.addAll(packages);
3915
3916        // Filter out all the ItemInfos that this is going to affect
3917        final HashSet<ItemInfo> infos = new HashSet<ItemInfo>();
3918        final HashSet<ComponentName> cns = new HashSet<ComponentName>();
3919        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
3920        for (CellLayout layoutParent : cellLayouts) {
3921            ViewGroup layout = layoutParent.getShortcutsAndWidgets();
3922            int childCount = layout.getChildCount();
3923            for (int i = 0; i < childCount; ++i) {
3924                View view = layout.getChildAt(i);
3925                infos.add((ItemInfo) view.getTag());
3926            }
3927        }
3928        LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
3929            @Override
3930            public boolean filterItem(ItemInfo parent, ItemInfo info,
3931                                      ComponentName cn) {
3932                if (packageNames.contains(cn.getPackageName())
3933                        && info.user.equals(user)) {
3934                    cns.add(cn);
3935                    return true;
3936                }
3937                return false;
3938            }
3939        };
3940        LauncherModel.filterItemInfos(infos, filter);
3941
3942        // Remove the affected components
3943        removeItemsByComponentName(cns, user);
3944    }
3945
3946    /**
3947     * Removes items that match the item info specified. When applications are removed
3948     * as a part of an update, this is called to ensure that other widgets and application
3949     * shortcuts are not removed.
3950     */
3951    void removeItemsByComponentName(final HashSet<ComponentName> componentNames,
3952            final UserHandleCompat user) {
3953        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
3954        for (final CellLayout layoutParent: cellLayouts) {
3955            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
3956
3957            final HashMap<ItemInfo, View> children = new HashMap<ItemInfo, View>();
3958            for (int j = 0; j < layout.getChildCount(); j++) {
3959                final View view = layout.getChildAt(j);
3960                children.put((ItemInfo) view.getTag(), view);
3961            }
3962
3963            final ArrayList<View> childrenToRemove = new ArrayList<View>();
3964            final HashMap<FolderInfo, ArrayList<ShortcutInfo>> folderAppsToRemove =
3965                    new HashMap<FolderInfo, ArrayList<ShortcutInfo>>();
3966            LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
3967                @Override
3968                public boolean filterItem(ItemInfo parent, ItemInfo info,
3969                                          ComponentName cn) {
3970                    if (parent instanceof FolderInfo) {
3971                        if (componentNames.contains(cn) && info.user.equals(user)) {
3972                            FolderInfo folder = (FolderInfo) parent;
3973                            ArrayList<ShortcutInfo> appsToRemove;
3974                            if (folderAppsToRemove.containsKey(folder)) {
3975                                appsToRemove = folderAppsToRemove.get(folder);
3976                            } else {
3977                                appsToRemove = new ArrayList<ShortcutInfo>();
3978                                folderAppsToRemove.put(folder, appsToRemove);
3979                            }
3980                            appsToRemove.add((ShortcutInfo) info);
3981                            return true;
3982                        }
3983                    } else {
3984                        if (componentNames.contains(cn) && info.user.equals(user)) {
3985                            childrenToRemove.add(children.get(info));
3986                            return true;
3987                        }
3988                    }
3989                    return false;
3990                }
3991            };
3992            LauncherModel.filterItemInfos(children.keySet(), filter);
3993
3994            // Remove all the apps from their folders
3995            for (FolderInfo folder : folderAppsToRemove.keySet()) {
3996                ArrayList<ShortcutInfo> appsToRemove = folderAppsToRemove.get(folder);
3997                for (ShortcutInfo info : appsToRemove) {
3998                    folder.remove(info);
3999                }
4000            }
4001
4002            // Remove all the other children
4003            for (View child : childrenToRemove) {
4004                // Note: We can not remove the view directly from CellLayoutChildren as this
4005                // does not re-mark the spaces as unoccupied.
4006                layoutParent.removeViewInLayout(child);
4007                if (child instanceof DropTarget) {
4008                    mDragController.removeDropTarget((DropTarget) child);
4009                }
4010            }
4011
4012            if (childrenToRemove.size() > 0) {
4013                layout.requestLayout();
4014                layout.invalidate();
4015            }
4016        }
4017
4018        // Strip all the empty screens
4019        stripEmptyScreens();
4020    }
4021
4022    public interface ItemOperator {
4023        /**
4024         * Process the next itemInfo, possibly with side-effect on {@link ItemOperator#value}.
4025         *
4026         * @param info info for the shortcut
4027         * @param view view for the shortcut
4028         * @param parent containing folder, or null
4029         * @return true if done, false to continue the map
4030         */
4031        public boolean evaluate(ItemInfo info, View view, View parent);
4032    }
4033
4034    /**
4035     * Map the operator over the shortcuts and widgets, return the first-non-null value.
4036     *
4037     * @param recurse true: iterate over folder children. false: op get the folders themselves.
4038     * @param op the operator to map over the shortcuts
4039     */
4040    void mapOverItems(boolean recurse, ItemOperator op) {
4041        ArrayList<ShortcutAndWidgetContainer> containers = getAllShortcutAndWidgetContainers();
4042        final int containerCount = containers.size();
4043        for (int containerIdx = 0; containerIdx < containerCount; containerIdx++) {
4044            ShortcutAndWidgetContainer container = containers.get(containerIdx);
4045            // map over all the shortcuts on the workspace
4046            final int itemCount = container.getChildCount();
4047            for (int itemIdx = 0; itemIdx < itemCount; itemIdx++) {
4048                View item = container.getChildAt(itemIdx);
4049                ItemInfo info = (ItemInfo) item.getTag();
4050                if (recurse && info instanceof FolderInfo && item instanceof FolderIcon) {
4051                    FolderIcon folder = (FolderIcon) item;
4052                    ArrayList<View> folderChildren = folder.getFolder().getItemsInReadingOrder();
4053                    // map over all the children in the folder
4054                    final int childCount = folderChildren.size();
4055                    for (int childIdx = 0; childIdx < childCount; childIdx++) {
4056                        View child = folderChildren.get(childIdx);
4057                        info = (ItemInfo) child.getTag();
4058                        if (op.evaluate(info, child, folder)) {
4059                            return;
4060                        }
4061                    }
4062                } else {
4063                    if (op.evaluate(info, item, null)) {
4064                        return;
4065                    }
4066                }
4067            }
4068        }
4069    }
4070
4071    void updateShortcuts(ArrayList<ShortcutInfo> shortcuts) {
4072        final HashSet<ShortcutInfo> updates = new HashSet<ShortcutInfo>(shortcuts);
4073        mapOverItems(MAP_RECURSE, new ItemOperator() {
4074            @Override
4075            public boolean evaluate(ItemInfo info, View v, View parent) {
4076                if (info instanceof ShortcutInfo && v instanceof BubbleTextView &&
4077                        updates.contains(info)) {
4078                    ShortcutInfo si = (ShortcutInfo) info;
4079                    BubbleTextView shortcut = (BubbleTextView) v;
4080                    Drawable oldIcon = getTextViewIcon(shortcut);
4081                    boolean oldPromiseState = (oldIcon instanceof PreloadIconDrawable)
4082                            && ((PreloadIconDrawable) oldIcon).hasNotCompleted();
4083                    shortcut.applyFromShortcutInfo(si, mIconCache,
4084                            si.isPromise() != oldPromiseState);
4085
4086                    if (parent != null) {
4087                        parent.invalidate();
4088                    }
4089                }
4090                // process all the shortcuts
4091                return false;
4092            }
4093        });
4094    }
4095
4096    public void removeAbandonedPromise(String packageName, UserHandleCompat user) {
4097        ArrayList<String> packages = new ArrayList<String>(1);
4098        packages.add(packageName);
4099        LauncherModel.deletePackageFromDatabase(mLauncher, packageName, user);
4100        removeItemsByPackageName(packages, user);
4101    }
4102
4103    public void updateRestoreItems(final HashSet<ItemInfo> updates) {
4104        mapOverItems(MAP_RECURSE, new ItemOperator() {
4105            @Override
4106            public boolean evaluate(ItemInfo info, View v, View parent) {
4107                if (info instanceof ShortcutInfo && v instanceof BubbleTextView
4108                        && updates.contains(info)) {
4109                    ((BubbleTextView) v).applyState(false);
4110                } else if (v instanceof PendingAppWidgetHostView
4111                        && info instanceof LauncherAppWidgetInfo
4112                        && updates.contains(info)) {
4113                    ((PendingAppWidgetHostView) v).applyState();
4114                }
4115                // process all the shortcuts
4116                return false;
4117            }
4118        });
4119    }
4120
4121    void widgetsRestored(ArrayList<LauncherAppWidgetInfo> changedInfo) {
4122        if (!changedInfo.isEmpty()) {
4123            DeferredWidgetRefresh widgetRefresh = new DeferredWidgetRefresh(changedInfo,
4124                    mLauncher.getAppWidgetHost());
4125            if (LauncherModel.getProviderInfo(getContext(),
4126                    changedInfo.get(0).providerName,
4127                    changedInfo.get(0).user) != null) {
4128                // Re-inflate the widgets which have changed status
4129                widgetRefresh.run();
4130            } else {
4131                // widgetRefresh will automatically run when the packages are updated.
4132                // For now just update the progress bars
4133                for (LauncherAppWidgetInfo info : changedInfo) {
4134                    if (info.hostView instanceof PendingAppWidgetHostView) {
4135                        info.installProgress = 100;
4136                        ((PendingAppWidgetHostView) info.hostView).applyState();
4137                    }
4138                }
4139            }
4140        }
4141    }
4142
4143    private void moveToScreen(int page, boolean animate) {
4144        if (!workspaceInModalState()) {
4145            if (animate) {
4146                snapToPage(page);
4147            } else {
4148                setCurrentPage(page);
4149            }
4150        }
4151        View child = getChildAt(page);
4152        if (child != null) {
4153            child.requestFocus();
4154        }
4155    }
4156
4157    void moveToDefaultScreen(boolean animate) {
4158        moveToScreen(getDefaultPage(), animate);
4159    }
4160
4161    void moveToCustomContentScreen(boolean animate) {
4162        if (hasCustomContent()) {
4163            int ccIndex = getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID);
4164            if (animate) {
4165                snapToPage(ccIndex);
4166            } else {
4167                setCurrentPage(ccIndex);
4168            }
4169            View child = getChildAt(ccIndex);
4170            if (child != null) {
4171                child.requestFocus();
4172            }
4173         }
4174        exitWidgetResizeMode();
4175    }
4176
4177    @Override
4178    protected PageIndicator.PageMarkerResources getPageIndicatorMarker(int pageIndex) {
4179        long screenId = getScreenIdForPageIndex(pageIndex);
4180        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
4181            int count = mScreenOrder.size() - numCustomPages();
4182            if (count > 1) {
4183                return new PageIndicator.PageMarkerResources(R.drawable.ic_pageindicator_current,
4184                        R.drawable.ic_pageindicator_add);
4185            }
4186        }
4187
4188        return super.getPageIndicatorMarker(pageIndex);
4189    }
4190
4191    protected String getPageIndicatorDescription() {
4192        String settings = getResources().getString(R.string.settings_button_text);
4193        return getCurrentPageDescription() + ", " + settings;
4194    }
4195
4196    protected String getCurrentPageDescription() {
4197        if (hasCustomContent() && getNextPage() == 0) {
4198            return mCustomContentDescription;
4199        }
4200        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4201        return getPageDescription(page);
4202    }
4203
4204    private String getPageDescription(int page) {
4205        int delta = numCustomPages();
4206        int nScreens = getChildCount() - delta;
4207        int extraScreenId = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
4208        if (extraScreenId >= 0 && nScreens > 1) {
4209            if (page == extraScreenId) {
4210                return getContext().getString(R.string.workspace_new_page);
4211            }
4212            nScreens--;
4213        }
4214        return getContext().getString(R.string.workspace_scroll_format,
4215                page + 1 - delta, nScreens);
4216    }
4217
4218    @Override
4219    public void fillInLaunchSourceData(View v, Bundle sourceData) {
4220        sourceData.putString(Stats.SOURCE_EXTRA_CONTAINER, Stats.CONTAINER_HOMESCREEN);
4221        sourceData.putInt(Stats.SOURCE_EXTRA_CONTAINER_PAGE, getCurrentPage());
4222    }
4223
4224    /**
4225     * Used as a workaround to ensure that the AppWidgetService receives the
4226     * PACKAGE_ADDED broadcast before updating widgets.
4227     */
4228    private class DeferredWidgetRefresh implements Runnable {
4229        private final ArrayList<LauncherAppWidgetInfo> mInfos;
4230        private final LauncherAppWidgetHost mHost;
4231        private final Handler mHandler;
4232
4233        private boolean mRefreshPending;
4234
4235        public DeferredWidgetRefresh(ArrayList<LauncherAppWidgetInfo> infos,
4236                LauncherAppWidgetHost host) {
4237            mInfos = infos;
4238            mHost = host;
4239            mHandler = new Handler();
4240            mRefreshPending = true;
4241
4242            mHost.addProviderChangeListener(this);
4243            // Force refresh after 10 seconds, if we don't get the provider changed event.
4244            // This could happen when the provider is no longer available in the app.
4245            mHandler.postDelayed(this, 10000);
4246        }
4247
4248        @Override
4249        public void run() {
4250            mHost.removeProviderChangeListener(this);
4251            mHandler.removeCallbacks(this);
4252
4253            if (!mRefreshPending) {
4254                return;
4255            }
4256
4257            mRefreshPending = false;
4258
4259            for (LauncherAppWidgetInfo info : mInfos) {
4260                if (info.hostView instanceof PendingAppWidgetHostView) {
4261                    // Remove and rebind the current widget, but don't delete it from the database
4262                    PendingAppWidgetHostView view = (PendingAppWidgetHostView) info.hostView;
4263                    mLauncher.removeItem(view, info, false /* deleteFromDb */);
4264                    mLauncher.bindAppWidget(info);
4265                }
4266            }
4267        }
4268    }
4269}
4270