Workspace.java revision 21f9f2a74795d88140794f3f64a26aed71ea1418 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.launcher3;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.LayoutTransition;
23import android.animation.ObjectAnimator;
24import android.animation.TimeInterpolator;
25import android.animation.ValueAnimator;
26import android.animation.ValueAnimator.AnimatorUpdateListener;
27import android.app.WallpaperManager;
28import android.appwidget.AppWidgetHostView;
29import android.appwidget.AppWidgetProviderInfo;
30import android.content.ComponentName;
31import android.content.Context;
32import android.content.Intent;
33import android.content.SharedPreferences;
34import android.content.res.Resources;
35import android.content.res.TypedArray;
36import android.graphics.Bitmap;
37import android.graphics.Canvas;
38import android.graphics.Matrix;
39import android.graphics.Point;
40import android.graphics.PointF;
41import android.graphics.Rect;
42import android.graphics.Region.Op;
43import android.graphics.drawable.Drawable;
44import android.net.Uri;
45import android.os.IBinder;
46import android.os.Parcelable;
47import android.util.AttributeSet;
48import android.util.Log;
49import android.util.SparseArray;
50import android.view.Choreographer;
51import android.view.Display;
52import android.view.MotionEvent;
53import android.view.View;
54import android.view.ViewGroup;
55import android.view.animation.DecelerateInterpolator;
56import android.view.animation.Interpolator;
57import android.widget.TextView;
58
59import com.android.launcher3.FolderIcon.FolderRingAnimator;
60import com.android.launcher3.Launcher.CustomContentCallbacks;
61import com.android.launcher3.LauncherSettings.Favorites;
62
63import java.util.ArrayList;
64import java.util.HashMap;
65import java.util.HashSet;
66import java.util.Iterator;
67
68/**
69 * The workspace is a wide area with a wallpaper and a finite number of pages.
70 * Each page contains a number of icons, folders or widgets the user can
71 * interact with. A workspace is meant to be used with a fixed width only.
72 */
73public class Workspace extends SmoothPagedView
74        implements DropTarget, DragSource, DragScroller, View.OnTouchListener,
75        DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener,
76        Insettable {
77    private static final String TAG = "Launcher.Workspace";
78
79    // Y rotation to apply to the workspace screens
80    private static final float WORKSPACE_OVERSCROLL_ROTATION = 24f;
81
82    private static final int CHILDREN_OUTLINE_FADE_OUT_DELAY = 0;
83    private static final int CHILDREN_OUTLINE_FADE_OUT_DURATION = 375;
84    private static final int CHILDREN_OUTLINE_FADE_IN_DURATION = 100;
85
86    private static final int BACKGROUND_FADE_OUT_DURATION = 350;
87    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
88    private static final int FLING_THRESHOLD_VELOCITY = 500;
89
90    private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
91
92    // These animators are used to fade the children's outlines
93    private ObjectAnimator mChildrenOutlineFadeInAnimation;
94    private ObjectAnimator mChildrenOutlineFadeOutAnimation;
95    private float mChildrenOutlineAlpha = 0;
96
97    // These properties refer to the background protection gradient used for AllApps and Customize
98    private ValueAnimator mBackgroundFadeInAnimation;
99    private ValueAnimator mBackgroundFadeOutAnimation;
100    private Drawable mBackground;
101    boolean mDrawBackground = true;
102    private float mBackgroundAlpha = 0;
103
104    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
105    private long mTouchDownTime = -1;
106    private long mCustomContentShowTime = -1;
107
108    private LayoutTransition mLayoutTransition;
109    private final WallpaperManager mWallpaperManager;
110    private IBinder mWindowToken;
111
112    private int mOriginalDefaultPage;
113    private int mDefaultPage;
114
115    private ShortcutAndWidgetContainer mDragSourceInternal;
116
117    // The screen id used for the empty screen always present to the right.
118    private final static long EXTRA_EMPTY_SCREEN_ID = -201;
119    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
120
121    private HashMap<Long, CellLayout> mWorkspaceScreens = new HashMap<Long, CellLayout>();
122    private ArrayList<Long> mScreenOrder = new ArrayList<Long>();
123
124    /**
125     * CellInfo for the cell that is currently being dragged
126     */
127    private CellLayout.CellInfo mDragInfo;
128
129    /**
130     * Target drop area calculated during last acceptDrop call.
131     */
132    private int[] mTargetCell = new int[2];
133    private int mDragOverX = -1;
134    private int mDragOverY = -1;
135
136    static Rect mLandscapeCellLayoutMetrics = null;
137    static Rect mPortraitCellLayoutMetrics = null;
138
139    CustomContentCallbacks mCustomContentCallbacks;
140    boolean mCustomContentShowing;
141    private float mLastCustomContentScrollProgress = -1f;
142
143    /**
144     * The CellLayout that is currently being dragged over
145     */
146    private CellLayout mDragTargetLayout = null;
147    /**
148     * The CellLayout that we will show as glowing
149     */
150    private CellLayout mDragOverlappingLayout = null;
151
152    /**
153     * The CellLayout which will be dropped to
154     */
155    private CellLayout mDropToLayout = null;
156
157    private Launcher mLauncher;
158    private IconCache mIconCache;
159    private DragController mDragController;
160
161    // These are temporary variables to prevent having to allocate a new object just to
162    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
163    private int[] mTempCell = new int[2];
164    private int[] mTempPt = new int[2];
165    private int[] mTempEstimate = new int[2];
166    private float[] mDragViewVisualCenter = new float[2];
167    private float[] mTempCellLayoutCenterCoordinates = new float[2];
168    private Matrix mTempInverseMatrix = new Matrix();
169
170    private SpringLoadedDragController mSpringLoadedDragController;
171    private float mSpringLoadedShrinkFactor;
172    private float mOverviewModeShrinkFactor;
173    private int mOverviewModePageOffset;
174
175    // State variable that indicates whether the pages are small (ie when you're
176    // in all apps or customize mode)
177
178    enum State { NORMAL, SPRING_LOADED, SMALL, OVERVIEW};
179    private State mState = State.NORMAL;
180    private boolean mIsSwitchingState = false;
181
182    boolean mAnimatingViewIntoPlace = false;
183    boolean mIsDragOccuring = false;
184    boolean mChildrenLayersEnabled = true;
185
186    private boolean mStripScreensOnPageStopMoving = false;
187
188    /** Is the user is dragging an item near the edge of a page? */
189    private boolean mInScrollArea = false;
190
191    private HolographicOutlineHelper mOutlineHelper;
192    private Bitmap mDragOutline = null;
193    private final Rect mTempRect = new Rect();
194    private final int[] mTempXY = new int[2];
195    private int[] mTempVisiblePagesRange = new int[2];
196    private boolean mOverscrollTransformsSet;
197    public static final int DRAG_BITMAP_PADDING = 2;
198    private boolean mWorkspaceFadeInAdjacentScreens;
199
200    WallpaperOffsetInterpolator mWallpaperOffset;
201    private Runnable mDelayedResizeRunnable;
202    private Runnable mDelayedSnapToPageRunnable;
203    private Point mDisplaySize = new Point();
204    private int mCameraDistance;
205
206    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
207    private static final int FOLDER_CREATION_TIMEOUT = 0;
208    private static final int REORDER_TIMEOUT = 250;
209    private final Alarm mFolderCreationAlarm = new Alarm();
210    private final Alarm mReorderAlarm = new Alarm();
211    private FolderRingAnimator mDragFolderRingAnimator = null;
212    private FolderIcon mDragOverFolderIcon = null;
213    private boolean mCreateUserFolderOnDrop = false;
214    private boolean mAddToExistingFolderOnDrop = false;
215    private DropTarget.DragEnforcer mDragEnforcer;
216    private float mMaxDistanceForFolderCreation;
217
218    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
219    private float mXDown;
220    private float mYDown;
221    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
222    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
223    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
224
225    // Relating to the animation of items being dropped externally
226    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
227    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
228    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
229    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
230    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
231
232    // Related to dragging, folder creation and reordering
233    private static final int DRAG_MODE_NONE = 0;
234    private static final int DRAG_MODE_CREATE_FOLDER = 1;
235    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
236    private static final int DRAG_MODE_REORDER = 3;
237    private int mDragMode = DRAG_MODE_NONE;
238    private int mLastReorderX = -1;
239    private int mLastReorderY = -1;
240
241    private SparseArray<Parcelable> mSavedStates;
242    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
243
244    // These variables are used for storing the initial and final values during workspace animations
245    private int mSavedScrollX;
246    private float mSavedRotationY;
247    private float mSavedTranslationX;
248
249    private float mCurrentScale;
250    private float mNewScale;
251    private float[] mOldBackgroundAlphas;
252    private float[] mOldAlphas;
253    private float[] mNewBackgroundAlphas;
254    private float[] mNewAlphas;
255    private int mLastChildCount = -1;
256    private float mTransitionProgress;
257
258    private Runnable mDeferredAction;
259    private boolean mDeferDropAfterUninstall;
260    private boolean mUninstallSuccessful;
261
262    private final Runnable mBindPages = new Runnable() {
263        @Override
264        public void run() {
265            mLauncher.getModel().bindRemainingSynchronousPages();
266        }
267    };
268
269    /**
270     * Used to inflate the Workspace from XML.
271     *
272     * @param context The application's context.
273     * @param attrs The attributes set containing the Workspace's customization values.
274     */
275    public Workspace(Context context, AttributeSet attrs) {
276        this(context, attrs, 0);
277    }
278
279    /**
280     * Used to inflate the Workspace from XML.
281     *
282     * @param context The application's context.
283     * @param attrs The attributes set containing the Workspace's customization values.
284     * @param defStyle Unused.
285     */
286    public Workspace(Context context, AttributeSet attrs, int defStyle) {
287        super(context, attrs, defStyle);
288        mContentIsRefreshable = false;
289
290        mOutlineHelper = HolographicOutlineHelper.obtain(context);
291
292        mDragEnforcer = new DropTarget.DragEnforcer(context);
293        // With workspace, data is available straight from the get-go
294        setDataIsReady();
295
296        mLauncher = (Launcher) context;
297        final Resources res = getResources();
298        mWorkspaceFadeInAdjacentScreens = res.getBoolean(R.bool.config_workspaceFadeAdjacentScreens);
299        mFadeInAdjacentScreens = false;
300        mWallpaperManager = WallpaperManager.getInstance(context);
301
302        TypedArray a = context.obtainStyledAttributes(attrs,
303                R.styleable.Workspace, defStyle, 0);
304        mSpringLoadedShrinkFactor =
305            res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f;
306        mOverviewModeShrinkFactor =
307                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100.0f;
308        mOverviewModePageOffset = res.getDimensionPixelSize(R.dimen.overview_mode_page_offset);
309        mCameraDistance = res.getInteger(R.integer.config_cameraDistance);
310        mOriginalDefaultPage = mDefaultPage = a.getInt(R.styleable.Workspace_defaultScreen, 1);
311        a.recycle();
312
313        setOnHierarchyChangeListener(this);
314        setHapticFeedbackEnabled(false);
315
316        initWorkspace();
317
318        // Disable multitouch across the workspace/all apps/customize tray
319        setMotionEventSplittingEnabled(true);
320
321        // Unless otherwise specified this view is important for accessibility.
322        if (getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
323            setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
324        }
325    }
326
327    @Override
328    public void setInsets(Rect insets) {
329        mInsets.set(insets);
330    }
331
332    // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each
333    // dimension if unsuccessful
334    public int[] estimateItemSize(int hSpan, int vSpan,
335            ItemInfo itemInfo, boolean springLoaded) {
336        int[] size = new int[2];
337        if (getChildCount() > 0) {
338            CellLayout cl = (CellLayout) mLauncher.getWorkspace().getChildAt(0);
339            Rect r = estimateItemPosition(cl, itemInfo, 0, 0, hSpan, vSpan);
340            size[0] = r.width();
341            size[1] = r.height();
342            if (springLoaded) {
343                size[0] *= mSpringLoadedShrinkFactor;
344                size[1] *= mSpringLoadedShrinkFactor;
345            }
346            return size;
347        } else {
348            size[0] = Integer.MAX_VALUE;
349            size[1] = Integer.MAX_VALUE;
350            return size;
351        }
352    }
353
354    public Rect estimateItemPosition(CellLayout cl, ItemInfo pendingInfo,
355            int hCell, int vCell, int hSpan, int vSpan) {
356        Rect r = new Rect();
357        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
358        return r;
359    }
360
361    public void onDragStart(final DragSource source, Object info, int dragAction) {
362        mIsDragOccuring = true;
363        updateChildrenLayersEnabled(false);
364        mLauncher.lockScreenOrientation();
365        mLauncher.onInteractionBegin();
366        setChildrenBackgroundAlphaMultipliers(1f);
367        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
368        InstallShortcutReceiver.enableInstallQueue();
369        UninstallShortcutReceiver.enableUninstallQueue();
370        post(new Runnable() {
371            @Override
372            public void run() {
373                if (mIsDragOccuring) {
374                    addExtraEmptyScreenOnDrag();
375                }
376            }
377        });
378    }
379
380    public void onDragEnd() {
381        mIsDragOccuring = false;
382        updateChildrenLayersEnabled(false);
383        mLauncher.unlockScreenOrientation(false);
384
385        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
386        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
387        UninstallShortcutReceiver.disableAndFlushUninstallQueue(getContext());
388
389        removeExtraEmptyScreen();
390        mDragSourceInternal = null;
391        mLauncher.onInteractionEnd();
392    }
393
394    /**
395     * Initializes various states for this workspace.
396     */
397    protected void initWorkspace() {
398        Context context = getContext();
399        mCurrentPage = mDefaultPage;
400        Launcher.setScreen(mCurrentPage);
401        LauncherAppState app = LauncherAppState.getInstance();
402        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
403        mIconCache = app.getIconCache();
404        setWillNotDraw(false);
405        setClipChildren(false);
406        setClipToPadding(false);
407        setChildrenDrawnWithCacheEnabled(true);
408
409        // This is a bit of a hack to account for the fact that we translate the workspace
410        // up a bit, and still need to draw the background covering the whole screen.
411        setMinScale(mOverviewModeShrinkFactor - 0.2f);
412        setupLayoutTransition();
413
414        final Resources res = getResources();
415        try {
416            mBackground = res.getDrawable(R.drawable.apps_customize_bg);
417        } catch (Resources.NotFoundException e) {
418            // In this case, we will skip drawing background protection
419        }
420
421        mWallpaperOffset = new WallpaperOffsetInterpolator();
422        Display display = mLauncher.getWindowManager().getDefaultDisplay();
423        display.getSize(mDisplaySize);
424
425        mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
426        mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
427    }
428
429    private void setupLayoutTransition() {
430        // We want to show layout transitions when pages are deleted, to close the gap.
431        mLayoutTransition = new LayoutTransition();
432        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
433        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
434        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
435        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
436        setLayoutTransition(mLayoutTransition);
437    }
438
439    @Override
440    protected int getScrollMode() {
441        return SmoothPagedView.X_LARGE_MODE;
442    }
443
444    @Override
445    public void onChildViewAdded(View parent, View child) {
446        if (!(child instanceof CellLayout)) {
447            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
448        }
449        CellLayout cl = ((CellLayout) child);
450        cl.setOnInterceptTouchListener(this);
451        cl.setClickable(true);
452        cl.setContentDescription(getContext().getString(
453                R.string.workspace_description_format, getChildCount()));
454
455        super.onChildViewAdded(parent, child);
456    }
457
458    protected boolean shouldDrawChild(View child) {
459        final CellLayout cl = (CellLayout) child;
460        return super.shouldDrawChild(child) &&
461            (cl.getShortcutsAndWidgets().getAlpha() > 0 ||
462             cl.getBackgroundAlpha() > 0);
463    }
464
465    /**
466     * @return The open folder on the current screen, or null if there is none
467     */
468    Folder getOpenFolder() {
469        DragLayer dragLayer = mLauncher.getDragLayer();
470        int count = dragLayer.getChildCount();
471        for (int i = 0; i < count; i++) {
472            View child = dragLayer.getChildAt(i);
473            if (child instanceof Folder) {
474                Folder folder = (Folder) child;
475                if (folder.getInfo().opened)
476                    return folder;
477            }
478        }
479        return null;
480    }
481
482    boolean isTouchActive() {
483        return mTouchState != TOUCH_STATE_REST;
484    }
485
486    public void removeAllWorkspaceScreens() {
487        // Remove the pages and clear the screen models
488        removeAllViews();
489        mScreenOrder.clear();
490        mWorkspaceScreens.clear();
491    }
492
493    public long insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {
494        // Find the index to insert this view into.  If the empty screen exists, then
495        // insert it before that.
496        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
497        if (insertIndex < 0) {
498            insertIndex = mScreenOrder.size();
499        }
500        return insertNewWorkspaceScreen(screenId, insertIndex);
501    }
502
503    public long insertNewWorkspaceScreen(long screenId) {
504        return insertNewWorkspaceScreen(screenId, getChildCount());
505    }
506
507    public long insertNewWorkspaceScreen(long screenId, int insertIndex) {
508        if (mWorkspaceScreens.containsKey(screenId)) {
509            throw new RuntimeException("Screen id " + screenId + " already exists!");
510        }
511
512        CellLayout newScreen = (CellLayout)
513                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
514
515        newScreen.setOnLongClickListener(mLongClickListener);
516        newScreen.setOnClickListener(mLauncher);
517        newScreen.setSoundEffectsEnabled(false);
518        mWorkspaceScreens.put(screenId, newScreen);
519        mScreenOrder.add(insertIndex, screenId);
520        addView(newScreen, insertIndex);
521        return screenId;
522    }
523
524    public void createCustomContentPage() {
525        CellLayout customScreen = (CellLayout)
526                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
527
528        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
529        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
530
531        // We want no padding on the custom content
532        customScreen.setPadding(0, 0, 0, 0);
533
534        addFullScreenPage(customScreen);
535
536        // Ensure that the current page and default page are maintained.
537        mDefaultPage = mOriginalDefaultPage + 1;
538        setCurrentPage(getCurrentPage() + 1);
539    }
540
541    public void removeCustomContentPage() {
542        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
543        if (customScreen == null) {
544            throw new RuntimeException("Expected custom content screen to exist");
545        }
546
547        mWorkspaceScreens.remove(CUSTOM_CONTENT_SCREEN_ID);
548        mScreenOrder.remove(CUSTOM_CONTENT_SCREEN_ID);
549        removeView(customScreen);
550        mCustomContentCallbacks = null;
551
552        // Ensure that the current page and default page are maintained.
553        mDefaultPage = mOriginalDefaultPage - 1;
554        setCurrentPage(getCurrentPage() - 1);
555    }
556
557    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks) {
558        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
559            throw new RuntimeException("Expected custom content screen to exist");
560        }
561
562        // Add the custom content to the full screen custom page
563        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
564        int spanX = customScreen.getCountX();
565        int spanY = customScreen.getCountY();
566        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
567        lp.canReorder  = false;
568        lp.isFullscreen = true;
569        if (customContent instanceof Insettable) {
570            ((Insettable)customContent).setInsets(mInsets);
571        }
572        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
573
574        mCustomContentCallbacks = callbacks;
575    }
576
577    public void addExtraEmptyScreenOnDrag() {
578        boolean lastChildOnScreen = false;
579        boolean childOnFinalScreen = false;
580
581        if (mDragSourceInternal != null) {
582            if (mDragSourceInternal.getChildCount() == 1) {
583                lastChildOnScreen = true;
584            }
585            CellLayout cl = (CellLayout) mDragSourceInternal.getParent();
586            if (indexOfChild(cl) == getChildCount() - 1) {
587                childOnFinalScreen = true;
588            }
589        }
590
591        // If this is the last item on the final screen
592        if (lastChildOnScreen && childOnFinalScreen) {
593            return;
594        }
595        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
596            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
597        }
598    }
599
600    public boolean addExtraEmptyScreen() {
601        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
602            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
603            return true;
604        }
605        return false;
606    }
607
608    public void removeExtraEmptyScreen() {
609        if (hasExtraEmptyScreen()) {
610            CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
611            mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
612            mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
613            removeView(cl);
614        }
615    }
616
617    public boolean hasExtraEmptyScreen() {
618        int nScreens = getChildCount();
619        nScreens = hasCustomContent() ? nScreens - 1 : nScreens;
620        return mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID) && nScreens > 1;
621    }
622
623    public long commitExtraEmptyScreen() {
624        int index = getPageIndexForScreenId(EXTRA_EMPTY_SCREEN_ID);
625        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
626        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
627        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
628
629        long newId = LauncherAppState.getLauncherProvider().generateNewScreenId();
630        mWorkspaceScreens.put(newId, cl);
631        mScreenOrder.add(newId);
632
633        // Update the page indicator marker
634        if (getPageIndicator() != null) {
635            getPageIndicator().updateMarker(index, getPageIndicatorMarker(index));
636        }
637
638        // Update the model for the new screen
639        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
640
641        return newId;
642    }
643
644
645    public CellLayout getScreenWithId(long screenId) {
646        CellLayout layout = mWorkspaceScreens.get(screenId);
647        return layout;
648    }
649
650    public long getIdForScreen(CellLayout layout) {
651        Iterator<Long> iter = mWorkspaceScreens.keySet().iterator();
652        while (iter.hasNext()) {
653            long id = iter.next();
654            if (mWorkspaceScreens.get(id) == layout) {
655                return id;
656            }
657        }
658        return -1;
659    }
660
661    public int getPageIndexForScreenId(long screenId) {
662        return indexOfChild(mWorkspaceScreens.get(screenId));
663    }
664
665    public long getScreenIdForPageIndex(int index) {
666        if (0 <= index && index < mScreenOrder.size()) {
667            return mScreenOrder.get(index);
668        }
669        return -1;
670    }
671
672    ArrayList<Long> getScreenOrder() {
673        return mScreenOrder;
674    }
675
676    public void stripEmptyScreens() {
677        if (isPageMoving()) {
678            mStripScreensOnPageStopMoving = true;
679            return;
680        }
681
682        int currentPage = getNextPage();
683        ArrayList<Long> removeScreens = new ArrayList<Long>();
684        for (Long id: mWorkspaceScreens.keySet()) {
685            CellLayout cl = mWorkspaceScreens.get(id);
686            if (id >= 0 && cl.getShortcutsAndWidgets().getChildCount() == 0) {
687                removeScreens.add(id);
688            }
689        }
690
691        // We enforce at least one page to add new items to. In the case that we remove the last
692        // such screen, we convert the last screen to the empty screen
693        int minScreens = hasCustomContent() ? 2 : 1;
694
695        int pageShift = 0;
696        for (Long id: removeScreens) {
697            CellLayout cl = mWorkspaceScreens.get(id);
698            mWorkspaceScreens.remove(id);
699            mScreenOrder.remove(id);
700
701            if (getChildCount() > minScreens) {
702                if (indexOfChild(cl) < currentPage) {
703                    pageShift++;
704                }
705                removeView(cl);
706            } else {
707                // if this is the last non-custom content screen, convert it to the empty screen
708                mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, cl);
709                mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
710            }
711        }
712
713        if (!removeScreens.isEmpty()) {
714            // Update the model if we have changed any screens
715            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
716        }
717
718        if (pageShift >= 0) {
719            setCurrentPage(currentPage - pageShift);
720        }
721    }
722
723    // See implementation for parameter definition.
724    void addInScreen(View child, long container, long screenId,
725            int x, int y, int spanX, int spanY) {
726        addInScreen(child, container, screenId, x, y, spanX, spanY, false, false);
727    }
728
729    // At bind time, we use the rank (screenId) to compute x and y for hotseat items.
730    // See implementation for parameter definition.
731    void addInScreenFromBind(View child, long container, long screenId, int x, int y,
732            int spanX, int spanY) {
733        addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);
734    }
735
736    // See implementation for parameter definition.
737    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
738            boolean insert) {
739        addInScreen(child, container, screenId, x, y, spanX, spanY, insert, false);
740    }
741
742    /**
743     * Adds the specified child in the specified screen. The position and dimension of
744     * the child are defined by x, y, spanX and spanY.
745     *
746     * @param child The child to add in one of the workspace's screens.
747     * @param screenId The screen in which to add the child.
748     * @param x The X position of the child in the screen's grid.
749     * @param y The Y position of the child in the screen's grid.
750     * @param spanX The number of cells spanned horizontally by the child.
751     * @param spanY The number of cells spanned vertically by the child.
752     * @param insert When true, the child is inserted at the beginning of the children list.
753     * @param computeXYFromRank When true, we use the rank (stored in screenId) to compute
754     *                          the x and y position in which to place hotseat items. Otherwise
755     *                          we use the x and y position to compute the rank.
756     */
757    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
758            boolean insert, boolean computeXYFromRank) {
759        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
760            if (getScreenWithId(screenId) == null) {
761                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
762                // DEBUGGING - Print out the stack trace to see where we are adding from
763                new Throwable().printStackTrace();
764                return;
765            }
766        }
767        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
768            // This should never happen
769            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
770        }
771
772        final CellLayout layout;
773        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
774            layout = mLauncher.getHotseat().getLayout();
775            child.setOnKeyListener(null);
776
777            // Hide folder title in the hotseat
778            if (child instanceof FolderIcon) {
779                ((FolderIcon) child).setTextVisible(false);
780            }
781
782            if (computeXYFromRank) {
783                x = mLauncher.getHotseat().getCellXFromOrder((int) screenId);
784                y = mLauncher.getHotseat().getCellYFromOrder((int) screenId);
785            } else {
786                screenId = mLauncher.getHotseat().getOrderInHotseat(x, y);
787            }
788        } else {
789            // Show folder title if not in the hotseat
790            if (child instanceof FolderIcon) {
791                ((FolderIcon) child).setTextVisible(true);
792            }
793            layout = getScreenWithId(screenId);
794            child.setOnKeyListener(new IconKeyEventListener());
795        }
796
797        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
798        CellLayout.LayoutParams lp;
799        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
800            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
801        } else {
802            lp = (CellLayout.LayoutParams) genericLp;
803            lp.cellX = x;
804            lp.cellY = y;
805            lp.cellHSpan = spanX;
806            lp.cellVSpan = spanY;
807        }
808
809        if (spanX < 0 && spanY < 0) {
810            lp.isLockedToGrid = false;
811        }
812
813        // Get the canonical child id to uniquely represent this view in this screen
814        int childId = LauncherModel.getCellLayoutChildId(container, screenId, x, y, spanX, spanY);
815        boolean markCellsAsOccupied = !(child instanceof Folder);
816        if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) {
817            // TODO: This branch occurs when the workspace is adding views
818            // outside of the defined grid
819            // maybe we should be deleting these items from the LauncherModel?
820            Launcher.addDumpLog(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout", true);
821        }
822
823        if (!(child instanceof Folder)) {
824            child.setHapticFeedbackEnabled(false);
825            child.setOnLongClickListener(mLongClickListener);
826        }
827        if (child instanceof DropTarget) {
828            mDragController.addDropTarget((DropTarget) child);
829        }
830    }
831
832    /**
833     * Called directly from a CellLayout (not by the framework), after we've been added as a
834     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
835     * that it should intercept touch events, which is not something that is normally supported.
836     */
837    @Override
838    public boolean onTouch(View v, MotionEvent event) {
839        return (isSmall() || !isFinishedSwitchingState())
840                || (!isSmall() && indexOfChild(v) != mCurrentPage);
841    }
842
843    public boolean isSwitchingState() {
844        return mIsSwitchingState;
845    }
846
847    /** This differs from isSwitchingState in that we take into account how far the transition
848     *  has completed. */
849    public boolean isFinishedSwitchingState() {
850        return !mIsSwitchingState || (mTransitionProgress > 0.5f);
851    }
852
853    protected void onWindowVisibilityChanged (int visibility) {
854        mLauncher.onWindowVisibilityChanged(visibility);
855        if (mCustomContentShowing && mCustomContentCallbacks != null) {
856            if (visibility == View.VISIBLE) {
857                mCustomContentCallbacks.onShow();
858            } else if (visibility == View.GONE) {
859                mCustomContentCallbacks.onHide();
860            }
861        }
862    }
863
864    @Override
865    public boolean dispatchUnhandledMove(View focused, int direction) {
866        if (isSmall() || !isFinishedSwitchingState()) {
867            // when the home screens are shrunken, shouldn't allow side-scrolling
868            return false;
869        }
870        return super.dispatchUnhandledMove(focused, direction);
871    }
872
873    @Override
874    public boolean onInterceptTouchEvent(MotionEvent ev) {
875        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
876        case MotionEvent.ACTION_DOWN:
877            mXDown = ev.getX();
878            mYDown = ev.getY();
879            mTouchDownTime = System.currentTimeMillis();
880            break;
881        case MotionEvent.ACTION_POINTER_UP:
882        case MotionEvent.ACTION_UP:
883            if (mTouchState == TOUCH_STATE_REST) {
884                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
885                if (!currentPage.lastDownOnOccupiedCell()) {
886                    onWallpaperTap(ev);
887                }
888            }
889        }
890        return super.onInterceptTouchEvent(ev);
891    }
892
893    protected void reinflateWidgetsIfNecessary() {
894        final int clCount = getChildCount();
895        for (int i = 0; i < clCount; i++) {
896            CellLayout cl = (CellLayout) getChildAt(i);
897            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
898            final int itemCount = swc.getChildCount();
899            for (int j = 0; j < itemCount; j++) {
900                View v = swc.getChildAt(j);
901
902                if (v.getTag() instanceof LauncherAppWidgetInfo) {
903                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
904                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) info.hostView;
905                    if (lahv != null && lahv.orientationChangedSincedInflation()) {
906                        mLauncher.removeAppWidget(info);
907                        // Remove the current widget which is inflated with the wrong orientation
908                        cl.removeView(lahv);
909                        mLauncher.bindAppWidget(info);
910                    }
911                }
912            }
913        }
914    }
915
916    @Override
917    protected void determineScrollingStart(MotionEvent ev) {
918        if (!isFinishedSwitchingState()) return;
919
920        float deltaX = ev.getX() - mXDown;
921        float absDeltaX = Math.abs(deltaX);
922        float absDeltaY = Math.abs(ev.getY() - mYDown);
923
924        if (Float.compare(absDeltaX, 0f) == 0) return;
925
926        float slope = absDeltaY / absDeltaX;
927        float theta = (float) Math.atan(slope);
928
929        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
930            cancelCurrentPageLongPress();
931        }
932
933        boolean passRightSwipesToCustomContent =
934                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
935
936        boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
937        if (swipeInIgnoreDirection && getScreenIdForPageIndex(getCurrentPage()) ==
938                CUSTOM_CONTENT_SCREEN_ID && passRightSwipesToCustomContent) {
939            // Pass swipes to the right to the custom content page.
940            return;
941        }
942
943        if (theta > MAX_SWIPE_ANGLE) {
944            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
945            return;
946        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
947            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
948            // increase the touch slop to make it harder to begin scrolling the workspace. This
949            // results in vertically scrolling widgets to more easily. The higher the angle, the
950            // more we increase touch slop.
951            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
952            float extraRatio = (float)
953                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
954            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
955        } else {
956            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
957            super.determineScrollingStart(ev);
958        }
959    }
960
961    protected void onPageBeginMoving() {
962        super.onPageBeginMoving();
963
964        if (isHardwareAccelerated()) {
965            updateChildrenLayersEnabled(false);
966        } else {
967            if (mNextPage != INVALID_PAGE) {
968                // we're snapping to a particular screen
969                enableChildrenCache(mCurrentPage, mNextPage);
970            } else {
971                // this is when user is actively dragging a particular screen, they might
972                // swipe it either left or right (but we won't advance by more than one screen)
973                enableChildrenCache(mCurrentPage - 1, mCurrentPage + 1);
974            }
975        }
976
977        // Only show page outlines as we pan if we are on large screen
978        if (LauncherAppState.getInstance().isScreenLarge()) {
979            showOutlines();
980        }
981
982        // If we are not fading in adjacent screens, we still need to restore the alpha in case the
983        // user scrolls while we are transitioning (should not affect dispatchDraw optimizations)
984        if (!mWorkspaceFadeInAdjacentScreens) {
985            for (int i = 0; i < getChildCount(); ++i) {
986                ((CellLayout) getPageAt(i)).setShortcutAndWidgetAlpha(1f);
987            }
988        }
989    }
990
991    protected void onPageEndMoving() {
992        super.onPageEndMoving();
993
994        if (isHardwareAccelerated()) {
995            updateChildrenLayersEnabled(false);
996        } else {
997            clearChildrenCache();
998        }
999
1000        if (mDragController.isDragging()) {
1001            if (isSmall()) {
1002                // If we are in springloaded mode, then force an event to check if the current touch
1003                // is under a new page (to scroll to)
1004                mDragController.forceTouchMove();
1005            }
1006        } else {
1007            // If we are not mid-dragging, hide the page outlines if we are on a large screen
1008            if (LauncherAppState.getInstance().isScreenLarge()) {
1009                hideOutlines();
1010            }
1011        }
1012
1013        if (mDelayedResizeRunnable != null) {
1014            mDelayedResizeRunnable.run();
1015            mDelayedResizeRunnable = null;
1016        }
1017
1018        if (mDelayedSnapToPageRunnable != null) {
1019            mDelayedSnapToPageRunnable.run();
1020            mDelayedSnapToPageRunnable = null;
1021        }
1022        if (mStripScreensOnPageStopMoving) {
1023            stripEmptyScreens();
1024            mStripScreensOnPageStopMoving = false;
1025        }
1026
1027        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
1028            mCustomContentShowing = true;
1029            if (mCustomContentCallbacks != null) {
1030                mCustomContentCallbacks.onShow();
1031                mCustomContentShowTime = System.currentTimeMillis();
1032            }
1033        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
1034            mCustomContentShowing = false;
1035            if (mCustomContentCallbacks != null) {
1036                mCustomContentCallbacks.onHide();
1037                mLauncher.resetQSBScroll();
1038            }
1039        }
1040    }
1041
1042    @Override
1043    protected void notifyPageSwitchListener() {
1044        super.notifyPageSwitchListener();
1045        Launcher.setScreen(mCurrentPage);
1046    };
1047
1048    protected void setWallpaperDimension() {
1049        String spKey = WallpaperCropActivity.getSharedPreferencesKey();
1050        SharedPreferences sp = mLauncher.getSharedPreferences(spKey, Context.MODE_PRIVATE);
1051        WallpaperPickerActivity.suggestWallpaperDimension(mLauncher.getResources(),
1052                sp, mLauncher.getWindowManager(), mWallpaperManager);
1053    }
1054
1055    protected void snapToPage(int whichPage, Runnable r) {
1056        if (mDelayedSnapToPageRunnable != null) {
1057            mDelayedSnapToPageRunnable.run();
1058        }
1059        mDelayedSnapToPageRunnable = r;
1060        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION);
1061    }
1062
1063    protected void snapToScreenId(long screenId, Runnable r) {
1064        snapToPage(getPageIndexForScreenId(screenId), r);
1065    }
1066
1067    class WallpaperOffsetInterpolator implements Choreographer.FrameCallback {
1068        float mFinalOffset = 0.0f;
1069        float mCurrentOffset = 0.5f; // to force an initial update
1070        //long mLastWallpaperOffsetUpdateTime;
1071        boolean mWaitingForUpdate;
1072        Choreographer mChoreographer;
1073        Interpolator mInterpolator;
1074        boolean mAnimating;
1075        long mAnimationStartTime;
1076        float mAnimationStartOffset;
1077        private final int ANIMATION_DURATION = 250;
1078        // Don't use all the wallpaper for parallax until you have at least this many pages
1079        private final int MIN_PARALLAX_PAGE_SPAN = 4;
1080        int mNumScreens;
1081
1082        public WallpaperOffsetInterpolator() {
1083            mChoreographer = Choreographer.getInstance();
1084            mInterpolator = new DecelerateInterpolator(1.5f);
1085        }
1086
1087        @Override
1088        public void doFrame(long frameTimeNanos) {
1089            updateOffset(false);
1090        }
1091
1092        private void updateOffset(boolean force) {
1093            if (mWaitingForUpdate || force) {
1094                mWaitingForUpdate = false;
1095                if (computeScrollOffset() && mWindowToken != null) {
1096                    try {
1097                        mWallpaperManager.setWallpaperOffsets(mWindowToken,
1098                                mWallpaperOffset.getCurrX(), 0.5f);
1099                        setWallpaperOffsetSteps();
1100                    } catch (IllegalArgumentException e) {
1101                        Log.e(TAG, "Error updating wallpaper offset: " + e);
1102                    }
1103                }
1104            }
1105        }
1106
1107        public boolean computeScrollOffset() {
1108            final float oldOffset = mCurrentOffset;
1109            if (mAnimating) {
1110                long durationSinceAnimation = System.currentTimeMillis() - mAnimationStartTime;
1111                float t0 = durationSinceAnimation / (float) ANIMATION_DURATION;
1112                float t1 = mInterpolator.getInterpolation(t0);
1113                mCurrentOffset = mAnimationStartOffset +
1114                        (mFinalOffset - mAnimationStartOffset) * t1;
1115                mAnimating = durationSinceAnimation < ANIMATION_DURATION;
1116            } else {
1117                mCurrentOffset = mFinalOffset;
1118            }
1119
1120            if (Math.abs(mCurrentOffset - mFinalOffset) > 0.0000001f) {
1121                scheduleUpdate();
1122            }
1123            if (Math.abs(oldOffset - mCurrentOffset) > 0.0000001f) {
1124                return true;
1125            }
1126            return false;
1127        }
1128
1129        private float wallpaperOffsetForCurrentScroll() {
1130            if (getChildCount() <= 1) {
1131                return 0;
1132            }
1133
1134            // Exclude the leftmost page
1135            final int firstIndex = isLayoutRtl() ? getChildCount() - 2 : 1;
1136            // Exclude the last extra empty screen (if we have > MIN_PARALLAX_PAGE_SPAN pages)
1137            int extra = numExtraScreensToIgnore();
1138            final int lastIndex = isLayoutRtl() ? 0 + extra : getChildCount() - 1 - extra;
1139
1140            int firstPageScrollX = getScrollForPage(firstIndex);
1141            int scrollRange = getScrollForPage(lastIndex) - firstPageScrollX;
1142            if (scrollRange == 0) {
1143                return 0;
1144            } else {
1145                // TODO: do different behavior if it's  a live wallpaper?
1146                float offset = Math.min(1, (getScrollX() - firstPageScrollX) / (float) scrollRange);
1147                offset = Math.max(0, offset);
1148                // Don't use up all the wallpaper parallax until you have at least
1149                // MIN_PARALLAX_PAGE_SPAN pages
1150                int numScrollingPages = getNumScreensExcludingExtraEmptyScreenAndLeftmost();
1151                int parallaxPageSpan = Math.max(MIN_PARALLAX_PAGE_SPAN, numScrollingPages) - 1;
1152                return offset * (numScrollingPages - 1) / parallaxPageSpan;
1153            }
1154        }
1155
1156        private int numExtraScreensToIgnore() {
1157            int numScrollingPages = getChildCount() - 1;
1158            if (numScrollingPages > MIN_PARALLAX_PAGE_SPAN && hasExtraEmptyScreen()) {
1159                return 1;
1160            } else {
1161                return 0;
1162            }
1163        }
1164
1165        private int getNumScreensExcludingExtraEmptyScreenAndLeftmost() {
1166            int numScrollingPages = getChildCount() - 1 - numExtraScreensToIgnore();
1167            return numScrollingPages;
1168        }
1169
1170        public void syncWithScroll() {
1171            float offset = wallpaperOffsetForCurrentScroll();
1172            mWallpaperOffset.setFinalX(offset);
1173            updateOffset(true);
1174        }
1175
1176        public float getCurrX() {
1177            return mCurrentOffset;
1178        }
1179
1180        public float getFinalX() {
1181            return mFinalOffset;
1182        }
1183
1184        private void animateToFinal() {
1185            mAnimating = true;
1186            mAnimationStartOffset = mCurrentOffset;
1187            mAnimationStartTime = System.currentTimeMillis();
1188        }
1189
1190        private void setWallpaperOffsetSteps() {
1191            // Set wallpaper offset steps (1 / (number of screens - 1))
1192            mWallpaperManager.setWallpaperOffsetSteps(1.0f / (getChildCount() - 1), 1.0f);
1193        }
1194
1195        public void setFinalX(float x) {
1196            scheduleUpdate();
1197            mFinalOffset = Math.max(0f, Math.min(x, 1.0f));
1198            if (getNumScreensExcludingExtraEmptyScreenAndLeftmost() != mNumScreens) {
1199                if (mNumScreens > 0) {
1200                    // Don't animate if we're going from 0 screens
1201                    animateToFinal();
1202                }
1203                mNumScreens = getNumScreensExcludingExtraEmptyScreenAndLeftmost();
1204            }
1205        }
1206
1207        private void scheduleUpdate() {
1208            if (!mWaitingForUpdate) {
1209                mChoreographer.postFrameCallback(this);
1210                mWaitingForUpdate = true;
1211            }
1212        }
1213
1214        public void jumpToFinal() {
1215            mCurrentOffset = mFinalOffset;
1216        }
1217    }
1218
1219    @Override
1220    public void computeScroll() {
1221        super.computeScroll();
1222        mWallpaperOffset.syncWithScroll();
1223    }
1224
1225    void showOutlines() {
1226        if (!isSmall() && !mIsSwitchingState) {
1227            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1228            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1229            mChildrenOutlineFadeInAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 1.0f);
1230            mChildrenOutlineFadeInAnimation.setDuration(CHILDREN_OUTLINE_FADE_IN_DURATION);
1231            mChildrenOutlineFadeInAnimation.start();
1232        }
1233    }
1234
1235    void hideOutlines() {
1236        if (!isSmall() && !mIsSwitchingState) {
1237            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1238            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1239            mChildrenOutlineFadeOutAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 0.0f);
1240            mChildrenOutlineFadeOutAnimation.setDuration(CHILDREN_OUTLINE_FADE_OUT_DURATION);
1241            mChildrenOutlineFadeOutAnimation.setStartDelay(CHILDREN_OUTLINE_FADE_OUT_DELAY);
1242            mChildrenOutlineFadeOutAnimation.start();
1243        }
1244    }
1245
1246    public void showOutlinesTemporarily() {
1247        if (!mIsPageMoving && !isTouchActive()) {
1248            snapToPage(mCurrentPage);
1249        }
1250    }
1251
1252    public void setChildrenOutlineAlpha(float alpha) {
1253        mChildrenOutlineAlpha = alpha;
1254        for (int i = 0; i < getChildCount(); i++) {
1255            CellLayout cl = (CellLayout) getChildAt(i);
1256            cl.setBackgroundAlpha(alpha);
1257        }
1258    }
1259
1260    public float getChildrenOutlineAlpha() {
1261        return mChildrenOutlineAlpha;
1262    }
1263
1264    void disableBackground() {
1265        mDrawBackground = false;
1266    }
1267    void enableBackground() {
1268        mDrawBackground = true;
1269    }
1270
1271    private void animateBackgroundGradient(float finalAlpha, boolean animated) {
1272        if (mBackground == null) return;
1273        if (mBackgroundFadeInAnimation != null) {
1274            mBackgroundFadeInAnimation.cancel();
1275            mBackgroundFadeInAnimation = null;
1276        }
1277        if (mBackgroundFadeOutAnimation != null) {
1278            mBackgroundFadeOutAnimation.cancel();
1279            mBackgroundFadeOutAnimation = null;
1280        }
1281        float startAlpha = getBackgroundAlpha();
1282        if (finalAlpha != startAlpha) {
1283            if (animated) {
1284                mBackgroundFadeOutAnimation =
1285                        LauncherAnimUtils.ofFloat(this, startAlpha, finalAlpha);
1286                mBackgroundFadeOutAnimation.addUpdateListener(new AnimatorUpdateListener() {
1287                    public void onAnimationUpdate(ValueAnimator animation) {
1288                        setBackgroundAlpha(((Float) animation.getAnimatedValue()).floatValue());
1289                    }
1290                });
1291                mBackgroundFadeOutAnimation.setInterpolator(new DecelerateInterpolator(1.5f));
1292                mBackgroundFadeOutAnimation.setDuration(BACKGROUND_FADE_OUT_DURATION);
1293                mBackgroundFadeOutAnimation.start();
1294            } else {
1295                setBackgroundAlpha(finalAlpha);
1296            }
1297        }
1298    }
1299
1300    public void setBackgroundAlpha(float alpha) {
1301        if (alpha != mBackgroundAlpha) {
1302            mBackgroundAlpha = alpha;
1303            invalidate();
1304        }
1305    }
1306
1307    public float getBackgroundAlpha() {
1308        return mBackgroundAlpha;
1309    }
1310
1311    float backgroundAlphaInterpolator(float r) {
1312        float pivotA = 0.1f;
1313        float pivotB = 0.4f;
1314        if (r < pivotA) {
1315            return 0;
1316        } else if (r > pivotB) {
1317            return 1.0f;
1318        } else {
1319            return (r - pivotA)/(pivotB - pivotA);
1320        }
1321    }
1322
1323    private void updatePageAlphaValues(int screenCenter) {
1324        boolean isInOverscroll = mOverScrollX < 0 || mOverScrollX > mMaxScrollX;
1325        if (mWorkspaceFadeInAdjacentScreens &&
1326                mState == State.NORMAL &&
1327                !mIsSwitchingState &&
1328                !isInOverscroll) {
1329            for (int i = 0; i < getChildCount(); i++) {
1330                CellLayout child = (CellLayout) getChildAt(i);
1331                if (child != null) {
1332                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1333                    float alpha = 1 - Math.abs(scrollProgress);
1334                    child.getShortcutsAndWidgets().setAlpha(alpha);
1335                    if (!mIsDragOccuring) {
1336                        child.setBackgroundAlphaMultiplier(
1337                                backgroundAlphaInterpolator(Math.abs(scrollProgress)));
1338                    } else {
1339                        child.setBackgroundAlphaMultiplier(1f);
1340                    }
1341                }
1342            }
1343        }
1344    }
1345
1346    private void setChildrenBackgroundAlphaMultipliers(float a) {
1347        for (int i = 0; i < getChildCount(); i++) {
1348            CellLayout child = (CellLayout) getChildAt(i);
1349            child.setBackgroundAlphaMultiplier(a);
1350        }
1351    }
1352
1353    public boolean hasCustomContent() {
1354        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1355    }
1356
1357    public boolean isOnOrMovingToCustomContent() {
1358        return hasCustomContent() && getNextPage() == 0;
1359    }
1360
1361    private void updateStateForCustomContent(int screenCenter) {
1362        float translationX = 0;
1363        float progress = 0;
1364        if (hasCustomContent()) {
1365            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1366            int scrollDelta = getScrollForPage(index + 1) - getScrollX();
1367            translationX = scrollDelta;
1368            progress = (1.0f * scrollDelta) /
1369                    (getScrollForPage(index + 1) - getScrollForPage(index));
1370
1371            if (isLayoutRtl()) {
1372                translationX = Math.min(0, translationX);
1373            } else {
1374                translationX = Math.max(0, translationX);
1375            }
1376            progress = Math.max(0, progress);
1377        }
1378
1379        if (Float.compare(progress, mLastCustomContentScrollProgress) == 0) return;
1380        mLastCustomContentScrollProgress = progress;
1381
1382        setBackgroundAlpha(progress * 0.8f);
1383
1384        if (mLauncher.getHotseat() != null) {
1385            mLauncher.getHotseat().setTranslationX(translationX);
1386        }
1387
1388        if (getPageIndicator() != null) {
1389            getPageIndicator().setTranslationX(translationX);
1390        }
1391
1392        if (mCustomContentCallbacks != null) {
1393            mCustomContentCallbacks.onScrollProgressChanged(progress);
1394        }
1395    }
1396
1397    @Override
1398    protected void screenScrolled(int screenCenter) {
1399        final boolean isRtl = isLayoutRtl();
1400        super.screenScrolled(screenCenter);
1401
1402        updatePageAlphaValues(screenCenter);
1403        updateStateForCustomContent(screenCenter);
1404        enableHwLayersOnVisiblePages();
1405
1406        boolean shouldOverScroll = (mOverScrollX < 0 && (!hasCustomContent() || isLayoutRtl())) ||
1407                (mOverScrollX > mMaxScrollX && (!hasCustomContent() || !isLayoutRtl()));
1408
1409        if (shouldOverScroll) {
1410            int index = 0;
1411            float pivotX = 0f;
1412            final float leftBiasedPivot = 0.25f;
1413            final float rightBiasedPivot = 0.75f;
1414            final int lowerIndex = 0;
1415            final int upperIndex = getChildCount() - 1;
1416            if (isRtl) {
1417                index = mOverScrollX < 0 ? upperIndex : lowerIndex;
1418                pivotX = (index == 0 ? leftBiasedPivot : rightBiasedPivot);
1419            } else {
1420                index = mOverScrollX < 0 ? lowerIndex : upperIndex;
1421                pivotX = (index == 0 ? rightBiasedPivot : leftBiasedPivot);
1422            }
1423
1424            CellLayout cl = (CellLayout) getChildAt(index);
1425            float scrollProgress = getScrollProgress(screenCenter, cl, index);
1426            final boolean isLeftPage = (isRtl ? index > 0 : index == 0);
1427            cl.setOverScrollAmount(Math.abs(scrollProgress), isLeftPage);
1428            float rotation = -WORKSPACE_OVERSCROLL_ROTATION * scrollProgress;
1429            cl.setRotationY(rotation);
1430            if (!mOverscrollTransformsSet) {
1431                mOverscrollTransformsSet = true;
1432                cl.setCameraDistance(mDensity * mCameraDistance);
1433                cl.setPivotX(cl.getMeasuredWidth() * pivotX);
1434                cl.setPivotY(cl.getMeasuredHeight() * 0.5f);
1435                cl.setOverscrollTransformsDirty(true);
1436            }
1437        } else {
1438            if (mOverscrollTransformsSet) {
1439                mOverscrollTransformsSet = false;
1440                ((CellLayout) getChildAt(0)).resetOverscrollTransforms();
1441                ((CellLayout) getChildAt(getChildCount() - 1)).resetOverscrollTransforms();
1442            }
1443        }
1444    }
1445
1446    @Override
1447    protected void overScroll(float amount) {
1448        acceleratedOverScroll(amount);
1449    }
1450
1451    protected void onAttachedToWindow() {
1452        super.onAttachedToWindow();
1453        mWindowToken = getWindowToken();
1454        computeScroll();
1455        mDragController.setWindowToken(mWindowToken);
1456    }
1457
1458    protected void onDetachedFromWindow() {
1459        super.onDetachedFromWindow();
1460        mWindowToken = null;
1461    }
1462
1463    @Override
1464    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1465        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1466            mWallpaperOffset.syncWithScroll();
1467            mWallpaperOffset.jumpToFinal();
1468        }
1469        super.onLayout(changed, left, top, right, bottom);
1470    }
1471
1472    @Override
1473    protected void onDraw(Canvas canvas) {
1474        // Draw the background gradient if necessary
1475        if (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground) {
1476            int alpha = (int) (mBackgroundAlpha * 255);
1477            mBackground.setAlpha(alpha);
1478            mBackground.setBounds(getScrollX(), 0, getScrollX() + getMeasuredWidth(),
1479                    getMeasuredHeight());
1480            mBackground.draw(canvas);
1481        }
1482
1483        super.onDraw(canvas);
1484
1485        // Call back to LauncherModel to finish binding after the first draw
1486        post(mBindPages);
1487    }
1488
1489    boolean isDrawingBackgroundGradient() {
1490        return (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground);
1491    }
1492
1493    @Override
1494    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
1495        if (!mLauncher.isAllAppsVisible()) {
1496            final Folder openFolder = getOpenFolder();
1497            if (openFolder != null) {
1498                return openFolder.requestFocus(direction, previouslyFocusedRect);
1499            } else {
1500                return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
1501            }
1502        }
1503        return false;
1504    }
1505
1506    @Override
1507    public int getDescendantFocusability() {
1508        if (isSmall()) {
1509            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1510        }
1511        return super.getDescendantFocusability();
1512    }
1513
1514    @Override
1515    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
1516        if (!mLauncher.isAllAppsVisible()) {
1517            final Folder openFolder = getOpenFolder();
1518            if (openFolder != null) {
1519                openFolder.addFocusables(views, direction);
1520            } else {
1521                super.addFocusables(views, direction, focusableMode);
1522            }
1523        }
1524    }
1525
1526    public boolean isSmall() {
1527        return mState == State.SMALL || mState == State.SPRING_LOADED || mState == State.OVERVIEW;
1528    }
1529
1530    void enableChildrenCache(int fromPage, int toPage) {
1531        if (fromPage > toPage) {
1532            final int temp = fromPage;
1533            fromPage = toPage;
1534            toPage = temp;
1535        }
1536
1537        final int screenCount = getChildCount();
1538
1539        fromPage = Math.max(fromPage, 0);
1540        toPage = Math.min(toPage, screenCount - 1);
1541
1542        for (int i = fromPage; i <= toPage; i++) {
1543            final CellLayout layout = (CellLayout) getChildAt(i);
1544            layout.setChildrenDrawnWithCacheEnabled(true);
1545            layout.setChildrenDrawingCacheEnabled(true);
1546        }
1547    }
1548
1549    void clearChildrenCache() {
1550        final int screenCount = getChildCount();
1551        for (int i = 0; i < screenCount; i++) {
1552            final CellLayout layout = (CellLayout) getChildAt(i);
1553            layout.setChildrenDrawnWithCacheEnabled(false);
1554            // In software mode, we don't want the items to continue to be drawn into bitmaps
1555            if (!isHardwareAccelerated()) {
1556                layout.setChildrenDrawingCacheEnabled(false);
1557            }
1558        }
1559    }
1560
1561    private void updateChildrenLayersEnabled(boolean force) {
1562        boolean small = mState == State.SMALL || mState == State.OVERVIEW || mIsSwitchingState;
1563        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageMoving();
1564
1565        if (enableChildrenLayers != mChildrenLayersEnabled) {
1566            mChildrenLayersEnabled = enableChildrenLayers;
1567            if (mChildrenLayersEnabled) {
1568                enableHwLayersOnVisiblePages();
1569            } else {
1570                for (int i = 0; i < getPageCount(); i++) {
1571                    final CellLayout cl = (CellLayout) getChildAt(i);
1572                    cl.disableHardwareLayers();
1573                }
1574            }
1575        }
1576    }
1577
1578    private void enableHwLayersOnVisiblePages() {
1579        if (mChildrenLayersEnabled) {
1580            final int screenCount = getChildCount();
1581            getVisiblePages(mTempVisiblePagesRange);
1582            int leftScreen = mTempVisiblePagesRange[0];
1583            int rightScreen = mTempVisiblePagesRange[1];
1584            if (leftScreen == rightScreen) {
1585                // make sure we're caching at least two pages always
1586                if (rightScreen < screenCount - 1) {
1587                    rightScreen++;
1588                } else if (leftScreen > 0) {
1589                    leftScreen--;
1590                }
1591            }
1592            for (int i = 0; i < screenCount; i++) {
1593                final CellLayout layout = (CellLayout) getPageAt(i);
1594                if (!(leftScreen <= i && i <= rightScreen && shouldDrawChild(layout))) {
1595                    layout.disableHardwareLayers();
1596                }
1597            }
1598            for (int i = 0; i < screenCount; i++) {
1599                final CellLayout layout = (CellLayout) getPageAt(i);
1600                if (leftScreen <= i && i <= rightScreen && shouldDrawChild(layout)) {
1601                    layout.enableHardwareLayers();
1602                }
1603            }
1604        }
1605    }
1606
1607    public void buildPageHardwareLayers() {
1608        // force layers to be enabled just for the call to buildLayer
1609        updateChildrenLayersEnabled(true);
1610        if (getWindowToken() != null) {
1611            final int childCount = getChildCount();
1612            for (int i = 0; i < childCount; i++) {
1613                CellLayout cl = (CellLayout) getChildAt(i);
1614                cl.buildHardwareLayer();
1615            }
1616        }
1617        updateChildrenLayersEnabled(false);
1618    }
1619
1620    protected void onWallpaperTap(MotionEvent ev) {
1621        final int[] position = mTempCell;
1622        getLocationOnScreen(position);
1623
1624        int pointerIndex = ev.getActionIndex();
1625        position[0] += (int) ev.getX(pointerIndex);
1626        position[1] += (int) ev.getY(pointerIndex);
1627
1628        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1629                ev.getAction() == MotionEvent.ACTION_UP
1630                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1631                position[0], position[1], 0, null);
1632    }
1633
1634    /*
1635     * This interpolator emulates the rate at which the perceived scale of an object changes
1636     * as its distance from a camera increases. When this interpolator is applied to a scale
1637     * animation on a view, it evokes the sense that the object is shrinking due to moving away
1638     * from the camera.
1639     */
1640    static class ZInterpolator implements TimeInterpolator {
1641        private float focalLength;
1642
1643        public ZInterpolator(float foc) {
1644            focalLength = foc;
1645        }
1646
1647        public float getInterpolation(float input) {
1648            return (1.0f - focalLength / (focalLength + input)) /
1649                (1.0f - focalLength / (focalLength + 1.0f));
1650        }
1651    }
1652
1653    /*
1654     * The exact reverse of ZInterpolator.
1655     */
1656    static class InverseZInterpolator implements TimeInterpolator {
1657        private ZInterpolator zInterpolator;
1658        public InverseZInterpolator(float foc) {
1659            zInterpolator = new ZInterpolator(foc);
1660        }
1661        public float getInterpolation(float input) {
1662            return 1 - zInterpolator.getInterpolation(1 - input);
1663        }
1664    }
1665
1666    /*
1667     * ZInterpolator compounded with an ease-out.
1668     */
1669    static class ZoomOutInterpolator implements TimeInterpolator {
1670        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(0.75f);
1671        private final ZInterpolator zInterpolator = new ZInterpolator(0.13f);
1672
1673        public float getInterpolation(float input) {
1674            return decelerate.getInterpolation(zInterpolator.getInterpolation(input));
1675        }
1676    }
1677
1678    /*
1679     * InvereZInterpolator compounded with an ease-out.
1680     */
1681    static class ZoomInInterpolator implements TimeInterpolator {
1682        private final InverseZInterpolator inverseZInterpolator = new InverseZInterpolator(0.35f);
1683        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(3.0f);
1684
1685        public float getInterpolation(float input) {
1686            return decelerate.getInterpolation(inverseZInterpolator.getInterpolation(input));
1687        }
1688    }
1689
1690    private final ZoomInInterpolator mZoomInInterpolator = new ZoomInInterpolator();
1691
1692    /*
1693    *
1694    * We call these methods (onDragStartedWithItemSpans/onDragStartedWithSize) whenever we
1695    * start a drag in Launcher, regardless of whether the drag has ever entered the Workspace
1696    *
1697    * These methods mark the appropriate pages as accepting drops (which alters their visual
1698    * appearance).
1699    *
1700    */
1701    public void onDragStartedWithItem(View v) {
1702        final Canvas canvas = new Canvas();
1703
1704        // The outline is used to visualize where the item will land if dropped
1705        mDragOutline = createDragOutline(v, canvas, DRAG_BITMAP_PADDING);
1706    }
1707
1708    public void onDragStartedWithItem(PendingAddItemInfo info, Bitmap b, boolean clipAlpha) {
1709        final Canvas canvas = new Canvas();
1710
1711        int[] size = estimateItemSize(info.spanX, info.spanY, info, false);
1712
1713        // The outline is used to visualize where the item will land if dropped
1714        mDragOutline = createDragOutline(b, canvas, DRAG_BITMAP_PADDING, size[0],
1715                size[1], clipAlpha);
1716    }
1717
1718    public void exitWidgetResizeMode() {
1719        DragLayer dragLayer = mLauncher.getDragLayer();
1720        dragLayer.clearAllResizeFrames();
1721    }
1722
1723    private void initAnimationArrays() {
1724        final int childCount = getChildCount();
1725        if (mLastChildCount == childCount) return;
1726
1727        mOldBackgroundAlphas = new float[childCount];
1728        mOldAlphas = new float[childCount];
1729        mNewBackgroundAlphas = new float[childCount];
1730        mNewAlphas = new float[childCount];
1731    }
1732
1733    Animator getChangeStateAnimation(final State state, boolean animated) {
1734        return getChangeStateAnimation(state, animated, 0, -1);
1735    }
1736
1737    @Override
1738    protected void getOverviewModePages(int[] range) {
1739        int count = mScreenOrder.size();
1740
1741        int start = hasCustomContent() ? 1 : 0;
1742        int end = getChildCount() - 1;
1743
1744        range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
1745        range[1] = Math.max(0,  end);
1746     }
1747
1748    protected void onStartReordering() {
1749        super.onStartReordering();
1750        int count = getChildCount();
1751        for (int i = 0; i < count; i++) {
1752            ((CellLayout) getChildAt(i)).setUseActiveGlowBackground(true);
1753        }
1754        showOutlines();
1755
1756        // Reordering handles its own animations, disable the automatic ones.
1757        setLayoutTransition(null);
1758    }
1759
1760    protected void onEndReordering() {
1761        super.onEndReordering();
1762        int count = getChildCount();
1763        for (int i = 0; i < count; i++) {
1764            ((CellLayout) getChildAt(i)).setUseActiveGlowBackground(false);
1765        }
1766        hideOutlines();
1767
1768        mScreenOrder.clear();
1769        for (int i = 0; i < count; i++) {
1770            CellLayout cl = ((CellLayout) getChildAt(i));
1771            mScreenOrder.add(getIdForScreen(cl));
1772        }
1773
1774        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1775
1776        // Re-enable auto layout transitions for page deletion.
1777        setLayoutTransition(mLayoutTransition);
1778    }
1779
1780    public boolean isInOverviewMode() {
1781        return mState == State.OVERVIEW;
1782    }
1783
1784    public void enterOverviewMode() {
1785        mLauncher.onInteractionBegin();
1786        enableOverviewMode(true, -1, true);
1787    }
1788
1789    public void exitOverviewMode(boolean animated) {
1790        exitOverviewMode(-1, animated);
1791        mLauncher.onInteractionEnd();
1792    }
1793
1794    public void exitOverviewMode(int snapPage, boolean animated) {
1795        enableOverviewMode(false, snapPage, animated);
1796        mLauncher.onInteractionEnd();
1797    }
1798
1799    private void enableOverviewMode(boolean enable, int snapPage, boolean animated) {
1800        State finalState = Workspace.State.OVERVIEW;
1801        if (!enable) {
1802            finalState = Workspace.State.NORMAL;
1803        }
1804
1805        Animator workspaceAnim = getChangeStateAnimation(finalState, animated, 0, snapPage);
1806        if (workspaceAnim != null) {
1807            onTransitionPrepare();
1808            workspaceAnim.addListener(new AnimatorListenerAdapter() {
1809                @Override
1810                public void onAnimationEnd(Animator arg0) {
1811                    onTransitionEnd();
1812                }
1813            });
1814            workspaceAnim.start();
1815        }
1816    }
1817
1818    int getOverviewModeTranslationY() {
1819        int childHeight = getNormalChildHeight();
1820        int viewPortHeight = getViewportHeight();
1821        int scaledChildHeight = (int) (mOverviewModeShrinkFactor * childHeight);
1822
1823        int offset = (viewPortHeight - scaledChildHeight) / 2;
1824        int offsetDelta = mOverviewModePageOffset - offset + mInsets.top;
1825
1826        return offsetDelta;
1827    }
1828
1829    Animator getChangeStateAnimation(final State state, boolean animated, int delay, int snapPage) {
1830        if (mState == state) {
1831            return null;
1832        }
1833
1834        // Initialize animation arrays for the first time if necessary
1835        initAnimationArrays();
1836
1837        AnimatorSet anim = animated ? LauncherAnimUtils.createAnimatorSet() : null;
1838
1839        final State oldState = mState;
1840        final boolean oldStateIsNormal = (oldState == State.NORMAL);
1841        final boolean oldStateIsSpringLoaded = (oldState == State.SPRING_LOADED);
1842        final boolean oldStateIsSmall = (oldState == State.SMALL);
1843        final boolean oldStateIsOverview = (oldState == State.OVERVIEW);
1844        mState = state;
1845        final boolean stateIsNormal = (state == State.NORMAL);
1846        final boolean stateIsSpringLoaded = (state == State.SPRING_LOADED);
1847        final boolean stateIsSmall = (state == State.SMALL);
1848        final boolean stateIsOverview = (state == State.OVERVIEW);
1849        float finalBackgroundAlpha = (stateIsSpringLoaded || stateIsOverview) ? 1.0f : 0f;
1850        float finalHotseatAndPageIndicatorAlpha = (stateIsOverview || stateIsSmall) ? 0f : 1f;
1851        float finalOverviewPanelAlpha = stateIsOverview ? 1f : 0f;
1852        float finalSearchBarAlpha = !stateIsNormal ? 0f : 1f;
1853        float finalWorkspaceTranslationY = stateIsOverview ? getOverviewModeTranslationY() : 0;
1854
1855        boolean zoomIn = true;
1856        mNewScale = 1.0f;
1857
1858        if (oldStateIsOverview) {
1859            disableFreeScroll(snapPage);
1860        } else if (stateIsOverview) {
1861            enableFreeScroll();
1862        }
1863
1864        if (state != State.NORMAL) {
1865            if (stateIsSpringLoaded) {
1866                mNewScale = mSpringLoadedShrinkFactor;
1867            } else if (stateIsOverview) {
1868                mNewScale = mOverviewModeShrinkFactor;
1869            } else if (stateIsSmall){
1870                mNewScale = mOverviewModeShrinkFactor - 0.3f;
1871            }
1872            if (oldStateIsNormal && stateIsSmall) {
1873                zoomIn = false;
1874                updateChildrenLayersEnabled(false);
1875            }
1876        }
1877        final int duration = zoomIn ?
1878                getResources().getInteger(R.integer.config_workspaceUnshrinkTime) :
1879                getResources().getInteger(R.integer.config_appsCustomizeWorkspaceShrinkTime);
1880        for (int i = 0; i < getChildCount(); i++) {
1881            final CellLayout cl = (CellLayout) getChildAt(i);
1882            float finalAlpha = (!mWorkspaceFadeInAdjacentScreens ||
1883                    (i == mCurrentPage)) && !stateIsSmall ? 1f : 0f;
1884            float initialAlpha = cl.getShortcutsAndWidgets().getAlpha();
1885
1886            mOldAlphas[i] = initialAlpha;
1887            mNewAlphas[i] = finalAlpha;
1888            if (animated) {
1889                mOldBackgroundAlphas[i] = cl.getBackgroundAlpha();
1890                mNewBackgroundAlphas[i] = finalBackgroundAlpha;
1891            } else {
1892                cl.setBackgroundAlpha(finalBackgroundAlpha);
1893                cl.setShortcutAndWidgetAlpha(finalAlpha);
1894            }
1895        }
1896
1897        View searchBar = mLauncher.getQsbBar();
1898        if (animated) {
1899            LauncherViewPropertyAnimator scale = new LauncherViewPropertyAnimator(this);
1900            scale.scaleX(mNewScale)
1901                .scaleY(mNewScale)
1902                .translationY(finalWorkspaceTranslationY)
1903                .setInterpolator(mZoomInInterpolator);
1904            anim.play(scale);
1905            for (int index = 0; index < getChildCount(); index++) {
1906                final int i = index;
1907                final CellLayout cl = (CellLayout) getChildAt(i);
1908                float currentAlpha = cl.getShortcutsAndWidgets().getAlpha();
1909                if (mOldAlphas[i] == 0 && mNewAlphas[i] == 0) {
1910                    cl.setBackgroundAlpha(mNewBackgroundAlphas[i]);
1911                    cl.setShortcutAndWidgetAlpha(mNewAlphas[i]);
1912                } else {
1913                    if (mOldAlphas[i] != mNewAlphas[i] || currentAlpha != mNewAlphas[i]) {
1914                        LauncherViewPropertyAnimator alphaAnim =
1915                            new LauncherViewPropertyAnimator(cl.getShortcutsAndWidgets());
1916                        alphaAnim.alpha(mNewAlphas[i])
1917                            .setDuration(duration)
1918                            .setInterpolator(mZoomInInterpolator);
1919                        anim.play(alphaAnim);
1920                    }
1921                    if (mOldBackgroundAlphas[i] != 0 ||
1922                        mNewBackgroundAlphas[i] != 0) {
1923                        ValueAnimator bgAnim =
1924                                LauncherAnimUtils.ofFloat(cl, 0f, 1f).setDuration(duration);
1925                        bgAnim.setInterpolator(mZoomInInterpolator);
1926                        bgAnim.addUpdateListener(new LauncherAnimatorUpdateListener() {
1927                                public void onAnimationUpdate(float a, float b) {
1928                                    cl.setBackgroundAlpha(
1929                                            a * mOldBackgroundAlphas[i] +
1930                                            b * mNewBackgroundAlphas[i]);
1931                                }
1932                            });
1933                        anim.play(bgAnim);
1934                    }
1935                }
1936            }
1937            ObjectAnimator pageIndicatorAlpha = null;
1938            if (getPageIndicator() != null) {
1939                pageIndicatorAlpha = ObjectAnimator.ofFloat(getPageIndicator(), "alpha",
1940                        finalHotseatAndPageIndicatorAlpha);
1941            }
1942            ObjectAnimator hotseatAlpha = ObjectAnimator.ofFloat(mLauncher.getHotseat(), "alpha",
1943                    finalHotseatAndPageIndicatorAlpha);
1944            ObjectAnimator searchBarAlpha = ObjectAnimator.ofFloat(searchBar,
1945                    "alpha", finalSearchBarAlpha);
1946            ObjectAnimator overviewPanelAlpha = ObjectAnimator.ofFloat(mLauncher.getOverviewPanel(),
1947                    "alpha", finalOverviewPanelAlpha);
1948            overviewPanelAlpha.addUpdateListener(new AlphaUpdateListener(
1949                    mLauncher.getOverviewPanel()));
1950            hotseatAlpha.addUpdateListener(new AlphaUpdateListener(mLauncher.getHotseat()));
1951            searchBarAlpha.addUpdateListener(new AlphaUpdateListener(searchBar));
1952            if (getPageIndicator() != null) {
1953                pageIndicatorAlpha.addUpdateListener(new AlphaUpdateListener(getPageIndicator()));
1954            }
1955            anim.play(overviewPanelAlpha);
1956            anim.play(hotseatAlpha);
1957            anim.play(searchBarAlpha);
1958            anim.play(pageIndicatorAlpha);
1959            anim.setStartDelay(delay);
1960        } else {
1961            mLauncher.getOverviewPanel().setAlpha(finalOverviewPanelAlpha);
1962            AlphaUpdateListener.updateVisibility(mLauncher.getOverviewPanel());
1963            mLauncher.getHotseat().setAlpha(finalHotseatAndPageIndicatorAlpha);
1964            AlphaUpdateListener.updateVisibility(mLauncher.getHotseat());
1965            if (getPageIndicator() != null) {
1966                getPageIndicator().setAlpha(finalHotseatAndPageIndicatorAlpha);
1967                AlphaUpdateListener.updateVisibility(getPageIndicator());
1968            }
1969            searchBar.setAlpha(finalSearchBarAlpha);
1970            AlphaUpdateListener.updateVisibility(searchBar);
1971            updateCustomContentVisibility();
1972            setScaleX(mNewScale);
1973            setScaleY(mNewScale);
1974            setTranslationY(finalWorkspaceTranslationY);
1975        }
1976        if (finalSearchBarAlpha == 0) {
1977            mLauncher.setVoiceButtonProxyVisible(false);
1978        } else {
1979            mLauncher.setVoiceButtonProxyVisible(true);
1980        }
1981
1982        if (stateIsSpringLoaded) {
1983            // Right now we're covered by Apps Customize
1984            // Show the background gradient immediately, so the gradient will
1985            // be showing once AppsCustomize disappears
1986            animateBackgroundGradient(getResources().getInteger(
1987                    R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f, false);
1988        } else if (stateIsOverview) {
1989            animateBackgroundGradient(getResources().getInteger(
1990                    R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f, true);
1991        } else {
1992            // Fade the background gradient away
1993            animateBackgroundGradient(0f, true);
1994        }
1995        return anim;
1996    }
1997
1998    static class AlphaUpdateListener implements AnimatorUpdateListener {
1999        View view;
2000        public AlphaUpdateListener(View v) {
2001            view = v;
2002        }
2003
2004        @Override
2005        public void onAnimationUpdate(ValueAnimator arg0) {
2006            updateVisibility(view);
2007        }
2008
2009        public static void updateVisibility(View view) {
2010            if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != INVISIBLE) {
2011                view.setVisibility(INVISIBLE);
2012            } else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
2013                    && view.getVisibility() != VISIBLE) {
2014                view.setVisibility(VISIBLE);
2015            }
2016        }
2017    }
2018
2019    @Override
2020    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
2021        onTransitionPrepare();
2022    }
2023
2024    @Override
2025    public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) {
2026    }
2027
2028    @Override
2029    public void onLauncherTransitionStep(Launcher l, float t) {
2030        mTransitionProgress = t;
2031    }
2032
2033    @Override
2034    public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) {
2035        onTransitionEnd();
2036    }
2037
2038    private void onTransitionPrepare() {
2039        mIsSwitchingState = true;
2040        updateChildrenLayersEnabled(false);
2041        hideCustomContentIfNecessary();
2042    }
2043
2044    void updateCustomContentVisibility() {
2045        int visibility = mState == Workspace.State.NORMAL ? VISIBLE : INVISIBLE;
2046        if (hasCustomContent()) {
2047            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(visibility);
2048        }
2049    }
2050
2051    void showCustomContentIfNecessary() {
2052        boolean show  = mState == Workspace.State.NORMAL;
2053        if (show && hasCustomContent()) {
2054            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(VISIBLE);
2055        }
2056    }
2057
2058    void hideCustomContentIfNecessary() {
2059        boolean hide  = mState != Workspace.State.NORMAL;
2060        if (hide && hasCustomContent()) {
2061            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
2062        }
2063    }
2064
2065    private void onTransitionEnd() {
2066        mIsSwitchingState = false;
2067        updateChildrenLayersEnabled(false);
2068        // The code in getChangeStateAnimation to determine initialAlpha and finalAlpha will ensure
2069        // ensure that only the current page is visible during (and subsequently, after) the
2070        // transition animation.  If fade adjacent pages is disabled, then re-enable the page
2071        // visibility after the transition animation.
2072        if (!mWorkspaceFadeInAdjacentScreens) {
2073            for (int i = 0; i < getChildCount(); i++) {
2074                final CellLayout cl = (CellLayout) getChildAt(i);
2075                cl.setShortcutAndWidgetAlpha(1f);
2076            }
2077        }
2078        showCustomContentIfNecessary();
2079    }
2080
2081    @Override
2082    public View getContent() {
2083        return this;
2084    }
2085
2086    /**
2087     * Draw the View v into the given Canvas.
2088     *
2089     * @param v the view to draw
2090     * @param destCanvas the canvas to draw on
2091     * @param padding the horizontal and vertical padding to use when drawing
2092     */
2093    private void drawDragView(View v, Canvas destCanvas, int padding, boolean pruneToDrawable) {
2094        final Rect clipRect = mTempRect;
2095        v.getDrawingRect(clipRect);
2096
2097        boolean textVisible = false;
2098
2099        destCanvas.save();
2100        if (v instanceof TextView && pruneToDrawable) {
2101            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2102            clipRect.set(0, 0, d.getIntrinsicWidth() + padding, d.getIntrinsicHeight() + padding);
2103            destCanvas.translate(padding / 2, padding / 2);
2104            d.draw(destCanvas);
2105        } else {
2106            if (v instanceof FolderIcon) {
2107                // For FolderIcons the text can bleed into the icon area, and so we need to
2108                // hide the text completely (which can't be achieved by clipping).
2109                if (((FolderIcon) v).getTextVisible()) {
2110                    ((FolderIcon) v).setTextVisible(false);
2111                    textVisible = true;
2112                }
2113            } else if (v instanceof BubbleTextView) {
2114                final BubbleTextView tv = (BubbleTextView) v;
2115                clipRect.bottom = tv.getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V +
2116                        tv.getLayout().getLineTop(0);
2117            } else if (v instanceof TextView) {
2118                final TextView tv = (TextView) v;
2119                clipRect.bottom = tv.getExtendedPaddingTop() - tv.getCompoundDrawablePadding() +
2120                        tv.getLayout().getLineTop(0);
2121            }
2122            destCanvas.translate(-v.getScrollX() + padding / 2, -v.getScrollY() + padding / 2);
2123            destCanvas.clipRect(clipRect, Op.REPLACE);
2124            v.draw(destCanvas);
2125
2126            // Restore text visibility of FolderIcon if necessary
2127            if (textVisible) {
2128                ((FolderIcon) v).setTextVisible(true);
2129            }
2130        }
2131        destCanvas.restore();
2132    }
2133
2134    /**
2135     * Returns a new bitmap to show when the given View is being dragged around.
2136     * Responsibility for the bitmap is transferred to the caller.
2137     */
2138    public Bitmap createDragBitmap(View v, Canvas canvas, int padding) {
2139        Bitmap b;
2140
2141        if (v instanceof TextView) {
2142            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2143            b = Bitmap.createBitmap(d.getIntrinsicWidth() + padding,
2144                    d.getIntrinsicHeight() + padding, Bitmap.Config.ARGB_8888);
2145        } else {
2146            b = Bitmap.createBitmap(
2147                    v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2148        }
2149
2150        canvas.setBitmap(b);
2151        drawDragView(v, canvas, padding, true);
2152        canvas.setBitmap(null);
2153
2154        return b;
2155    }
2156
2157    /**
2158     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2159     * Responsibility for the bitmap is transferred to the caller.
2160     */
2161    private Bitmap createDragOutline(View v, Canvas canvas, int padding) {
2162        final int outlineColor = getResources().getColor(R.color.outline_color);
2163        final Bitmap b = Bitmap.createBitmap(
2164                v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2165
2166        canvas.setBitmap(b);
2167        drawDragView(v, canvas, padding, true);
2168        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor);
2169        canvas.setBitmap(null);
2170        return b;
2171    }
2172
2173    /**
2174     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2175     * Responsibility for the bitmap is transferred to the caller.
2176     */
2177    private Bitmap createDragOutline(Bitmap orig, Canvas canvas, int padding, int w, int h,
2178            boolean clipAlpha) {
2179        final int outlineColor = getResources().getColor(R.color.outline_color);
2180        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
2181        canvas.setBitmap(b);
2182
2183        Rect src = new Rect(0, 0, orig.getWidth(), orig.getHeight());
2184        float scaleFactor = Math.min((w - padding) / (float) orig.getWidth(),
2185                (h - padding) / (float) orig.getHeight());
2186        int scaledWidth = (int) (scaleFactor * orig.getWidth());
2187        int scaledHeight = (int) (scaleFactor * orig.getHeight());
2188        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
2189
2190        // center the image
2191        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
2192
2193        canvas.drawBitmap(orig, src, dst, null);
2194        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor,
2195                clipAlpha);
2196        canvas.setBitmap(null);
2197
2198        return b;
2199    }
2200
2201    void startDrag(CellLayout.CellInfo cellInfo) {
2202        View child = cellInfo.cell;
2203
2204        // Make sure the drag was started by a long press as opposed to a long click.
2205        if (!child.isInTouchMode()) {
2206            return;
2207        }
2208
2209        mDragInfo = cellInfo;
2210        child.setVisibility(INVISIBLE);
2211        CellLayout layout = (CellLayout) child.getParent().getParent();
2212        layout.prepareChildForDrag(child);
2213
2214        child.clearFocus();
2215        child.setPressed(false);
2216
2217        final Canvas canvas = new Canvas();
2218
2219        // The outline is used to visualize where the item will land if dropped
2220        mDragOutline = createDragOutline(child, canvas, DRAG_BITMAP_PADDING);
2221        beginDragShared(child, this);
2222    }
2223
2224    public void beginDragShared(View child, DragSource source) {
2225        // The drag bitmap follows the touch point around on the screen
2226        final Bitmap b = createDragBitmap(child, new Canvas(), DRAG_BITMAP_PADDING);
2227
2228        final int bmpWidth = b.getWidth();
2229        final int bmpHeight = b.getHeight();
2230
2231        float scale = mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY);
2232        int dragLayerX =
2233                Math.round(mTempXY[0] - (bmpWidth - scale * child.getWidth()) / 2);
2234        int dragLayerY =
2235                Math.round(mTempXY[1] - (bmpHeight - scale * bmpHeight) / 2
2236                        - DRAG_BITMAP_PADDING / 2);
2237
2238        LauncherAppState app = LauncherAppState.getInstance();
2239        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
2240        Point dragVisualizeOffset = null;
2241        Rect dragRect = null;
2242        if (child instanceof BubbleTextView || child instanceof PagedViewIcon) {
2243            int iconSize = grid.iconSizePx;
2244            int top = child.getPaddingTop();
2245            int left = (bmpWidth - iconSize) / 2;
2246            int right = left + iconSize;
2247            int bottom = top + iconSize;
2248            dragLayerY += top;
2249            // Note: The drag region is used to calculate drag layer offsets, but the
2250            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2251            dragVisualizeOffset = new Point(-DRAG_BITMAP_PADDING / 2, DRAG_BITMAP_PADDING / 2);
2252            dragRect = new Rect(left, top, right, bottom);
2253        } else if (child instanceof FolderIcon) {
2254            int previewSize = grid.folderIconSizePx;
2255            dragRect = new Rect(0, child.getPaddingTop(), child.getWidth(), previewSize);
2256        }
2257
2258        // Clear the pressed state if necessary
2259        if (child instanceof BubbleTextView) {
2260            BubbleTextView icon = (BubbleTextView) child;
2261            icon.clearPressedOrFocusedBackground();
2262        }
2263
2264        mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(),
2265                DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect, scale);
2266
2267        if (child.getParent() instanceof ShortcutAndWidgetContainer) {
2268            mDragSourceInternal = (ShortcutAndWidgetContainer) child.getParent();
2269        }
2270
2271        b.recycle();
2272    }
2273
2274    void addApplicationShortcut(ShortcutInfo info, CellLayout target, long container, long screenId,
2275            int cellX, int cellY, boolean insertAtFirst, int intersectX, int intersectY) {
2276        View view = mLauncher.createShortcut(R.layout.application, target, (ShortcutInfo) info);
2277
2278        final int[] cellXY = new int[2];
2279        target.findCellForSpanThatIntersects(cellXY, 1, 1, intersectX, intersectY);
2280        addInScreen(view, container, screenId, cellXY[0], cellXY[1], 1, 1, insertAtFirst);
2281
2282        LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId, cellXY[0],
2283                cellXY[1]);
2284    }
2285
2286    public boolean transitionStateShouldAllowDrop() {
2287        return ((!isSwitchingState() || mTransitionProgress > 0.5f) && mState != State.SMALL);
2288    }
2289
2290    /**
2291     * {@inheritDoc}
2292     */
2293    public boolean acceptDrop(DragObject d) {
2294        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2295        CellLayout dropTargetLayout = mDropToLayout;
2296        if (d.dragSource != this) {
2297            // Don't accept the drop if we're not over a screen at time of drop
2298            if (dropTargetLayout == null) {
2299                return false;
2300            }
2301            if (!transitionStateShouldAllowDrop()) return false;
2302
2303            mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
2304                    d.dragView, 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, null);
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                final ItemInfo dragInfo = (ItemInfo) d.dragInfo;
2321                spanX = dragInfo.spanX;
2322                spanY = dragInfo.spanY;
2323            }
2324
2325            int minSpanX = spanX;
2326            int minSpanY = spanY;
2327            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2328                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2329                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2330            }
2331
2332            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2333                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2334                    mTargetCell);
2335            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2336                    mDragViewVisualCenter[1], mTargetCell);
2337            if (willCreateUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2338                    mTargetCell, distance, true)) {
2339                return true;
2340            }
2341            if (willAddToExistingUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2342                    mTargetCell, distance)) {
2343                return true;
2344            }
2345
2346            int[] resultSpan = new int[2];
2347            mTargetCell = dropTargetLayout.createArea((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, float
2379            distance, boolean considerTimeout) {
2380        if (distance > mMaxDistanceForFolderCreation) return false;
2381        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2382
2383        if (dropOverView != null) {
2384            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2385            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2386                return false;
2387            }
2388        }
2389
2390        boolean hasntMoved = false;
2391        if (mDragInfo != null) {
2392            hasntMoved = dropOverView == mDragInfo.cell;
2393        }
2394
2395        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2396            return false;
2397        }
2398
2399        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2400        boolean willBecomeShortcut =
2401                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2402                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT);
2403
2404        return (aboveShortcut && willBecomeShortcut);
2405    }
2406
2407    boolean willAddToExistingUserFolder(Object dragInfo, CellLayout target, int[] targetCell,
2408            float distance) {
2409        if (distance > mMaxDistanceForFolderCreation) return false;
2410        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2411
2412        if (dropOverView != null) {
2413            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2414            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2415                return false;
2416            }
2417        }
2418
2419        if (dropOverView instanceof FolderIcon) {
2420            FolderIcon fi = (FolderIcon) dropOverView;
2421            if (fi.acceptDrop(dragInfo)) {
2422                return true;
2423            }
2424        }
2425        return false;
2426    }
2427
2428    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2429            int[] targetCell, float distance, boolean external, DragView dragView,
2430            Runnable postAnimationRunnable) {
2431        if (distance > mMaxDistanceForFolderCreation) return false;
2432        View v = target.getChildAt(targetCell[0], targetCell[1]);
2433
2434        boolean hasntMoved = false;
2435        if (mDragInfo != null) {
2436            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2437            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2438                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2439        }
2440
2441        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2442        mCreateUserFolderOnDrop = false;
2443        final long screenId = (targetCell == null) ? mDragInfo.screenId : getIdForScreen(target);
2444
2445        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2446        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2447
2448        if (aboveShortcut && willBecomeShortcut) {
2449            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2450            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2451            // if the drag started here, we need to remove it from the workspace
2452            if (!external) {
2453                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2454            }
2455
2456            Rect folderLocation = new Rect();
2457            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2458            target.removeView(v);
2459
2460            FolderIcon fi =
2461                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2462            destInfo.cellX = -1;
2463            destInfo.cellY = -1;
2464            sourceInfo.cellX = -1;
2465            sourceInfo.cellY = -1;
2466
2467            // If the dragView is null, we can't animate
2468            boolean animate = dragView != null;
2469            if (animate) {
2470                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2471                        postAnimationRunnable);
2472            } else {
2473                fi.addItem(destInfo);
2474                fi.addItem(sourceInfo);
2475            }
2476            return true;
2477        }
2478        return false;
2479    }
2480
2481    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2482            float distance, DragObject d, boolean external) {
2483        if (distance > mMaxDistanceForFolderCreation) return false;
2484
2485        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2486        if (!mAddToExistingFolderOnDrop) return false;
2487        mAddToExistingFolderOnDrop = false;
2488
2489        if (dropOverView instanceof FolderIcon) {
2490            FolderIcon fi = (FolderIcon) dropOverView;
2491            if (fi.acceptDrop(d.dragInfo)) {
2492                fi.onDrop(d);
2493
2494                // if the drag started here, we need to remove it from the workspace
2495                if (!external) {
2496                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2497                }
2498                return true;
2499            }
2500        }
2501        return false;
2502    }
2503
2504    public void onDrop(final DragObject d) {
2505        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset, d.dragView,
2506                mDragViewVisualCenter);
2507
2508        CellLayout dropTargetLayout = mDropToLayout;
2509
2510        // We want the point to be mapped to the dragTarget.
2511        if (dropTargetLayout != null) {
2512            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2513                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2514            } else {
2515                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter, null);
2516            }
2517        }
2518
2519        int snapScreen = -1;
2520        boolean resizeOnDrop = false;
2521        if (d.dragSource != this) {
2522            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2523                    (int) mDragViewVisualCenter[1] };
2524            onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d);
2525        } else if (mDragInfo != null) {
2526            final View cell = mDragInfo.cell;
2527
2528            Runnable resizeRunnable = null;
2529            if (dropTargetLayout != null && !d.cancelled) {
2530                // Move internally
2531                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2532                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2533                long container = hasMovedIntoHotseat ?
2534                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2535                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2536                long screenId = (mTargetCell[0] < 0) ?
2537                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2538                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2539                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2540                // First we find the cell nearest to point at which the item is
2541                // dropped, without any consideration to whether there is an item there.
2542
2543                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2544                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2545                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2546                        mDragViewVisualCenter[1], mTargetCell);
2547
2548                // If the item being dropped is a shortcut and the nearest drop
2549                // cell also contains a shortcut, then create a folder with the two shortcuts.
2550                if (!mInScrollArea && createUserFolderIfNecessary(cell, container,
2551                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2552                    stripEmptyScreens();
2553                    return;
2554                }
2555
2556                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2557                        distance, d, false)) {
2558                    stripEmptyScreens();
2559                    return;
2560                }
2561
2562                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2563                // we need to find the nearest cell location that is vacant
2564                ItemInfo item = (ItemInfo) d.dragInfo;
2565                int minSpanX = item.spanX;
2566                int minSpanY = item.spanY;
2567                if (item.minSpanX > 0 && item.minSpanY > 0) {
2568                    minSpanX = item.minSpanX;
2569                    minSpanY = item.minSpanY;
2570                }
2571
2572                int[] resultSpan = new int[2];
2573                mTargetCell = dropTargetLayout.createArea((int) mDragViewVisualCenter[0],
2574                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2575                        mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2576
2577                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2578
2579                // if the widget resizes on drop
2580                if (foundCell && (cell instanceof AppWidgetHostView) &&
2581                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2582                    resizeOnDrop = true;
2583                    item.spanX = resultSpan[0];
2584                    item.spanY = resultSpan[1];
2585                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2586                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2587                            resultSpan[1]);
2588                }
2589
2590                if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2591                    snapScreen = getPageIndexForScreenId(screenId);
2592                    snapToPage(snapScreen);
2593                }
2594
2595                if (foundCell) {
2596                    final ItemInfo info = (ItemInfo) cell.getTag();
2597                    if (hasMovedLayouts) {
2598                        // Reparent the view
2599                        getParentCellLayoutForView(cell).removeView(cell);
2600                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2601                                info.spanX, info.spanY);
2602                    }
2603
2604                    // update the item's position after drop
2605                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2606                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2607                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2608                    lp.cellHSpan = item.spanX;
2609                    lp.cellVSpan = item.spanY;
2610                    lp.isLockedToGrid = true;
2611                    cell.setId(LauncherModel.getCellLayoutChildId(container, mDragInfo.screenId,
2612                            mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY));
2613
2614                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2615                            cell instanceof LauncherAppWidgetHostView) {
2616                        final CellLayout cellLayout = dropTargetLayout;
2617                        // We post this call so that the widget has a chance to be placed
2618                        // in its final location
2619
2620                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2621                        AppWidgetProviderInfo pinfo = hostView.getAppWidgetInfo();
2622                        if (pinfo != null &&
2623                                pinfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE) {
2624                            final Runnable addResizeFrame = new Runnable() {
2625                                public void run() {
2626                                    DragLayer dragLayer = mLauncher.getDragLayer();
2627                                    dragLayer.addResizeFrame(info, hostView, cellLayout);
2628                                }
2629                            };
2630                            resizeRunnable = (new Runnable() {
2631                                public void run() {
2632                                    if (!isPageMoving()) {
2633                                        addResizeFrame.run();
2634                                    } else {
2635                                        mDelayedResizeRunnable = addResizeFrame;
2636                                    }
2637                                }
2638                            });
2639                        }
2640                    }
2641
2642                    LauncherModel.moveItemInDatabase(mLauncher, info, container, screenId, lp.cellX,
2643                            lp.cellY);
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            final Runnable finalResizeRunnable = resizeRunnable;
2656            // Prepare it to be animated into its new position
2657            // This must be called after the view has been re-parented
2658            final Runnable onCompleteRunnable = new Runnable() {
2659                @Override
2660                public void run() {
2661                    mAnimatingViewIntoPlace = false;
2662                    updateChildrenLayersEnabled(false);
2663                    if (finalResizeRunnable != null) {
2664                        finalResizeRunnable.run();
2665                    }
2666                    stripEmptyScreens();
2667                }
2668            };
2669            mAnimatingViewIntoPlace = true;
2670            if (d.dragView.hasDrawn()) {
2671                final ItemInfo info = (ItemInfo) cell.getTag();
2672                if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET) {
2673                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2674                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2675                    animateWidgetDrop(info, parent, d.dragView,
2676                            onCompleteRunnable, animationType, cell, false);
2677                } else {
2678                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2679                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2680                            onCompleteRunnable, this);
2681                }
2682            } else {
2683                d.deferDragViewCleanupPostAnimation = false;
2684                cell.setVisibility(VISIBLE);
2685            }
2686            parent.onDropChild(cell);
2687        }
2688    }
2689
2690    public void setFinalScrollForPageChange(int pageIndex) {
2691        CellLayout cl = (CellLayout) getChildAt(pageIndex);
2692        if (cl != null) {
2693            mSavedScrollX = getScrollX();
2694            mSavedTranslationX = cl.getTranslationX();
2695            mSavedRotationY = cl.getRotationY();
2696            final int newX = getScrollForPage(pageIndex);
2697            setScrollX(newX);
2698            cl.setTranslationX(0f);
2699            cl.setRotationY(0f);
2700        }
2701    }
2702
2703    public void resetFinalScrollForPageChange(int pageIndex) {
2704        if (pageIndex >= 0) {
2705            CellLayout cl = (CellLayout) getChildAt(pageIndex);
2706            setScrollX(mSavedScrollX);
2707            cl.setTranslationX(mSavedTranslationX);
2708            cl.setRotationY(mSavedRotationY);
2709        }
2710    }
2711
2712    public void getViewLocationRelativeToSelf(View v, int[] location) {
2713        getLocationInWindow(location);
2714        int x = location[0];
2715        int y = location[1];
2716
2717        v.getLocationInWindow(location);
2718        int vX = location[0];
2719        int vY = location[1];
2720
2721        location[0] = vX - x;
2722        location[1] = vY - y;
2723    }
2724
2725    public void onDragEnter(DragObject d) {
2726        mDragEnforcer.onDragEnter();
2727        mCreateUserFolderOnDrop = false;
2728        mAddToExistingFolderOnDrop = false;
2729
2730        mDropToLayout = null;
2731        CellLayout layout = getCurrentDropLayout();
2732        setCurrentDropLayout(layout);
2733        setCurrentDragOverlappingLayout(layout);
2734
2735        // Because we don't have space in the Phone UI (the CellLayouts run to the edge) we
2736        // don't need to show the outlines
2737        if (LauncherAppState.getInstance().isScreenLarge()) {
2738            showOutlines();
2739        }
2740    }
2741
2742    static Rect getCellLayoutMetrics(Launcher launcher, int orientation) {
2743        LauncherAppState app = LauncherAppState.getInstance();
2744        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
2745
2746        Resources res = launcher.getResources();
2747        Display display = launcher.getWindowManager().getDefaultDisplay();
2748        Point smallestSize = new Point();
2749        Point largestSize = new Point();
2750        display.getCurrentSizeRange(smallestSize, largestSize);
2751        int countX = (int) grid.numColumns;
2752        int countY = (int) grid.numRows;
2753        if (orientation == CellLayout.LANDSCAPE) {
2754            if (mLandscapeCellLayoutMetrics == null) {
2755                Rect padding = grid.getWorkspacePadding(CellLayout.LANDSCAPE);
2756                int width = largestSize.x - padding.left - padding.right;
2757                int height = smallestSize.y - padding.top - padding.bottom;
2758                mLandscapeCellLayoutMetrics = new Rect();
2759                CellLayout.getMetrics(mLandscapeCellLayoutMetrics, width, height,
2760                        countX, countY);
2761            }
2762            return mLandscapeCellLayoutMetrics;
2763        } else if (orientation == CellLayout.PORTRAIT) {
2764            if (mPortraitCellLayoutMetrics == null) {
2765                Rect padding = grid.getWorkspacePadding(CellLayout.PORTRAIT);
2766                int width = smallestSize.x - padding.left - padding.right;
2767                int height = largestSize.y - padding.top - padding.bottom;
2768                mPortraitCellLayoutMetrics = new Rect();
2769                CellLayout.getMetrics(mPortraitCellLayoutMetrics, width, height,
2770                        countX, countY);
2771            }
2772            return mPortraitCellLayoutMetrics;
2773        }
2774        return null;
2775    }
2776
2777    public void onDragExit(DragObject d) {
2778        mDragEnforcer.onDragExit();
2779
2780        // Here we store the final page that will be dropped to, if the workspace in fact
2781        // receives the drop
2782        if (mInScrollArea) {
2783            if (isPageMoving()) {
2784                // If the user drops while the page is scrolling, we should use that page as the
2785                // destination instead of the page that is being hovered over.
2786                mDropToLayout = (CellLayout) getPageAt(getNextPage());
2787            } else {
2788                mDropToLayout = mDragOverlappingLayout;
2789            }
2790        } else {
2791            mDropToLayout = mDragTargetLayout;
2792        }
2793
2794        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2795            mCreateUserFolderOnDrop = true;
2796        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2797            mAddToExistingFolderOnDrop = true;
2798        }
2799
2800        // Reset the scroll area and previous drag target
2801        onResetScrollArea();
2802        setCurrentDropLayout(null);
2803        setCurrentDragOverlappingLayout(null);
2804
2805        mSpringLoadedDragController.cancel();
2806
2807        if (!mIsPageMoving) {
2808            hideOutlines();
2809        }
2810    }
2811
2812    void setCurrentDropLayout(CellLayout layout) {
2813        if (mDragTargetLayout != null) {
2814            mDragTargetLayout.revertTempState();
2815            mDragTargetLayout.onDragExit();
2816        }
2817        mDragTargetLayout = layout;
2818        if (mDragTargetLayout != null) {
2819            mDragTargetLayout.onDragEnter();
2820        }
2821        cleanupReorder(true);
2822        cleanupFolderCreation();
2823        setCurrentDropOverCell(-1, -1);
2824    }
2825
2826    void setCurrentDragOverlappingLayout(CellLayout layout) {
2827        if (mDragOverlappingLayout != null) {
2828            mDragOverlappingLayout.setIsDragOverlapping(false);
2829        }
2830        mDragOverlappingLayout = layout;
2831        if (mDragOverlappingLayout != null) {
2832            mDragOverlappingLayout.setIsDragOverlapping(true);
2833        }
2834        invalidate();
2835    }
2836
2837    void setCurrentDropOverCell(int x, int y) {
2838        if (x != mDragOverX || y != mDragOverY) {
2839            mDragOverX = x;
2840            mDragOverY = y;
2841            setDragMode(DRAG_MODE_NONE);
2842        }
2843    }
2844
2845    void setDragMode(int dragMode) {
2846        if (dragMode != mDragMode) {
2847            if (dragMode == DRAG_MODE_NONE) {
2848                cleanupAddToFolder();
2849                // We don't want to cancel the re-order alarm every time the target cell changes
2850                // as this feels to slow / unresponsive.
2851                cleanupReorder(false);
2852                cleanupFolderCreation();
2853            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2854                cleanupReorder(true);
2855                cleanupFolderCreation();
2856            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2857                cleanupAddToFolder();
2858                cleanupReorder(true);
2859            } else if (dragMode == DRAG_MODE_REORDER) {
2860                cleanupAddToFolder();
2861                cleanupFolderCreation();
2862            }
2863            mDragMode = dragMode;
2864        }
2865    }
2866
2867    private void cleanupFolderCreation() {
2868        if (mDragFolderRingAnimator != null) {
2869            mDragFolderRingAnimator.animateToNaturalState();
2870        }
2871        mFolderCreationAlarm.cancelAlarm();
2872    }
2873
2874    private void cleanupAddToFolder() {
2875        if (mDragOverFolderIcon != null) {
2876            mDragOverFolderIcon.onDragExit(null);
2877            mDragOverFolderIcon = null;
2878        }
2879    }
2880
2881    private void cleanupReorder(boolean cancelAlarm) {
2882        // Any pending reorders are canceled
2883        if (cancelAlarm) {
2884            mReorderAlarm.cancelAlarm();
2885        }
2886        mLastReorderX = -1;
2887        mLastReorderY = -1;
2888    }
2889
2890   /*
2891    *
2892    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
2893    * coordinate space. The argument xy is modified with the return result.
2894    *
2895    * if cachedInverseMatrix is not null, this method will just use that matrix instead of
2896    * computing it itself; we use this to avoid redundant matrix inversions in
2897    * findMatchingPageForDragOver
2898    *
2899    */
2900   void mapPointFromSelfToChild(View v, float[] xy, Matrix cachedInverseMatrix) {
2901       xy[0] = xy[0] - v.getLeft();
2902       xy[1] = xy[1] - v.getTop();
2903   }
2904
2905   boolean isPointInSelfOverHotseat(int x, int y, Rect r) {
2906       if (r == null) {
2907           r = new Rect();
2908       }
2909       mTempPt[0] = x;
2910       mTempPt[1] = y;
2911       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
2912       mLauncher.getHotseat().getHitRect(r);
2913       if (r.contains(mTempPt[0], mTempPt[1])) {
2914           return true;
2915       }
2916       return false;
2917   }
2918
2919   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
2920       mTempPt[0] = (int) xy[0];
2921       mTempPt[1] = (int) xy[1];
2922       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
2923       mLauncher.getDragLayer().mapCoordInSelfToDescendent(hotseat.getLayout(), mTempPt);
2924
2925       xy[0] = mTempPt[0];
2926       xy[1] = mTempPt[1];
2927   }
2928
2929   /*
2930    *
2931    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
2932    * the parent View's coordinate space. The argument xy is modified with the return result.
2933    *
2934    */
2935   void mapPointFromChildToSelf(View v, float[] xy) {
2936       xy[0] += v.getLeft();
2937       xy[1] += v.getTop();
2938   }
2939
2940   static private float squaredDistance(float[] point1, float[] point2) {
2941        float distanceX = point1[0] - point2[0];
2942        float distanceY = point2[1] - point2[1];
2943        return distanceX * distanceX + distanceY * distanceY;
2944   }
2945
2946    /*
2947     *
2948     * This method returns the CellLayout that is currently being dragged to. In order to drag
2949     * to a CellLayout, either the touch point must be directly over the CellLayout, or as a second
2950     * strategy, we see if the dragView is overlapping any CellLayout and choose the closest one
2951     *
2952     * Return null if no CellLayout is currently being dragged over
2953     *
2954     */
2955    private CellLayout findMatchingPageForDragOver(
2956            DragView dragView, float originX, float originY, boolean exact) {
2957        // We loop through all the screens (ie CellLayouts) and see which ones overlap
2958        // with the item being dragged and then choose the one that's closest to the touch point
2959        final int screenCount = getChildCount();
2960        CellLayout bestMatchingScreen = null;
2961        float smallestDistSoFar = Float.MAX_VALUE;
2962
2963        for (int i = 0; i < screenCount; i++) {
2964            // The custom content screen is not a valid drag over option
2965            if (mScreenOrder.get(i) == CUSTOM_CONTENT_SCREEN_ID) {
2966                continue;
2967            }
2968
2969            CellLayout cl = (CellLayout) getChildAt(i);
2970
2971            final float[] touchXy = {originX, originY};
2972            // Transform the touch coordinates to the CellLayout's local coordinates
2973            // If the touch point is within the bounds of the cell layout, we can return immediately
2974            cl.getMatrix().invert(mTempInverseMatrix);
2975            mapPointFromSelfToChild(cl, touchXy, mTempInverseMatrix);
2976
2977            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
2978                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
2979                return cl;
2980            }
2981
2982            if (!exact) {
2983                // Get the center of the cell layout in screen coordinates
2984                final float[] cellLayoutCenter = mTempCellLayoutCenterCoordinates;
2985                cellLayoutCenter[0] = cl.getWidth()/2;
2986                cellLayoutCenter[1] = cl.getHeight()/2;
2987                mapPointFromChildToSelf(cl, cellLayoutCenter);
2988
2989                touchXy[0] = originX;
2990                touchXy[1] = originY;
2991
2992                // Calculate the distance between the center of the CellLayout
2993                // and the touch point
2994                float dist = squaredDistance(touchXy, cellLayoutCenter);
2995
2996                if (dist < smallestDistSoFar) {
2997                    smallestDistSoFar = dist;
2998                    bestMatchingScreen = cl;
2999                }
3000            }
3001        }
3002        return bestMatchingScreen;
3003    }
3004
3005    // This is used to compute the visual center of the dragView. This point is then
3006    // used to visualize drop locations and determine where to drop an item. The idea is that
3007    // the visual center represents the user's interpretation of where the item is, and hence
3008    // is the appropriate point to use when determining drop location.
3009    private float[] getDragViewVisualCenter(int x, int y, int xOffset, int yOffset,
3010            DragView dragView, float[] recycle) {
3011        float res[];
3012        if (recycle == null) {
3013            res = new float[2];
3014        } else {
3015            res = recycle;
3016        }
3017
3018        // First off, the drag view has been shifted in a way that is not represented in the
3019        // x and y values or the x/yOffsets. Here we account for that shift.
3020        x += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetX);
3021        y += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetY);
3022
3023        // These represent the visual top and left of drag view if a dragRect was provided.
3024        // If a dragRect was not provided, then they correspond to the actual view left and
3025        // top, as the dragRect is in that case taken to be the entire dragView.
3026        // R.dimen.dragViewOffsetY.
3027        int left = x - xOffset;
3028        int top = y - yOffset;
3029
3030        // In order to find the visual center, we shift by half the dragRect
3031        res[0] = left + dragView.getDragRegion().width() / 2;
3032        res[1] = top + dragView.getDragRegion().height() / 2;
3033
3034        return res;
3035    }
3036
3037    private boolean isDragWidget(DragObject d) {
3038        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
3039                d.dragInfo instanceof PendingAddWidgetInfo);
3040    }
3041    private boolean isExternalDragWidget(DragObject d) {
3042        return d.dragSource != this && isDragWidget(d);
3043    }
3044
3045    public void onDragOver(DragObject d) {
3046        // Skip drag over events while we are dragging over side pages
3047        if (mInScrollArea || mIsSwitchingState || mState == State.SMALL) return;
3048
3049        Rect r = new Rect();
3050        CellLayout layout = null;
3051        ItemInfo item = (ItemInfo) d.dragInfo;
3052
3053        // Ensure that we have proper spans for the item that we are dropping
3054        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
3055        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
3056            d.dragView, mDragViewVisualCenter);
3057
3058        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
3059        // Identify whether we have dragged over a side page
3060        if (isSmall()) {
3061            if (mLauncher.getHotseat() != null && !isExternalDragWidget(d)) {
3062                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
3063                    layout = mLauncher.getHotseat().getLayout();
3064                }
3065            }
3066            if (layout == null) {
3067                layout = findMatchingPageForDragOver(d.dragView, d.x, d.y, false);
3068            }
3069            if (layout != mDragTargetLayout) {
3070                setCurrentDropLayout(layout);
3071                setCurrentDragOverlappingLayout(layout);
3072
3073                boolean isInSpringLoadedMode = (mState == State.SPRING_LOADED);
3074                if (isInSpringLoadedMode) {
3075                    if (mLauncher.isHotseatLayout(layout)) {
3076                        mSpringLoadedDragController.cancel();
3077                    } else {
3078                        mSpringLoadedDragController.setAlarm(mDragTargetLayout);
3079                    }
3080                }
3081            }
3082        } else {
3083            // Test to see if we are over the hotseat otherwise just use the current page
3084            if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3085                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
3086                    layout = mLauncher.getHotseat().getLayout();
3087                }
3088            }
3089            if (layout == null) {
3090                layout = getCurrentDropLayout();
3091            }
3092            if (layout != mDragTargetLayout) {
3093                setCurrentDropLayout(layout);
3094                setCurrentDragOverlappingLayout(layout);
3095            }
3096        }
3097
3098        // Handle the drag over
3099        if (mDragTargetLayout != null) {
3100            // We want the point to be mapped to the dragTarget.
3101            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3102                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
3103            } else {
3104                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter, null);
3105            }
3106
3107            ItemInfo info = (ItemInfo) d.dragInfo;
3108
3109            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3110                    (int) mDragViewVisualCenter[1], item.spanX, item.spanY,
3111                    mDragTargetLayout, mTargetCell);
3112
3113            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
3114
3115            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
3116                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
3117
3118            final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0],
3119                    mTargetCell[1]);
3120
3121            manageFolderFeedback(info, mDragTargetLayout, mTargetCell,
3122                    targetCellDistance, dragOverView);
3123
3124            int minSpanX = item.spanX;
3125            int minSpanY = item.spanY;
3126            if (item.minSpanX > 0 && item.minSpanY > 0) {
3127                minSpanX = item.minSpanX;
3128                minSpanY = item.minSpanY;
3129            }
3130
3131            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3132                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3133                    item.spanY, child, mTargetCell);
3134
3135            if (!nearestDropOccupied) {
3136                mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3137                        (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3138                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false,
3139                        d.dragView.getDragVisualizeOffset(), d.dragView.getDragRegion());
3140            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3141                    && !mReorderAlarm.alarmPending() && (mLastReorderX != mTargetCell[0] ||
3142                    mLastReorderY != mTargetCell[1])) {
3143
3144                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3145                // reorder, then we schedule a reorder
3146                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3147                        minSpanX, minSpanY, item.spanX, item.spanY, d.dragView, child);
3148                mReorderAlarm.setOnAlarmListener(listener);
3149                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3150            }
3151
3152            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3153                    !nearestDropOccupied) {
3154                if (mDragTargetLayout != null) {
3155                    mDragTargetLayout.revertTempState();
3156                }
3157            }
3158        }
3159    }
3160
3161    private void manageFolderFeedback(ItemInfo info, CellLayout targetLayout,
3162            int[] targetCell, float distance, View dragOverView) {
3163        boolean userFolderPending = willCreateUserFolder(info, targetLayout, targetCell, distance,
3164                false);
3165
3166        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3167                !mFolderCreationAlarm.alarmPending()) {
3168            mFolderCreationAlarm.setOnAlarmListener(new
3169                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]));
3170            mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3171            return;
3172        }
3173
3174        boolean willAddToFolder =
3175                willAddToExistingUserFolder(info, targetLayout, targetCell, distance);
3176
3177        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3178            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3179            mDragOverFolderIcon.onDragEnter(info);
3180            if (targetLayout != null) {
3181                targetLayout.clearDragOutlines();
3182            }
3183            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3184            return;
3185        }
3186
3187        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3188            setDragMode(DRAG_MODE_NONE);
3189        }
3190        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3191            setDragMode(DRAG_MODE_NONE);
3192        }
3193
3194        return;
3195    }
3196
3197    class FolderCreationAlarmListener implements OnAlarmListener {
3198        CellLayout layout;
3199        int cellX;
3200        int cellY;
3201
3202        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3203            this.layout = layout;
3204            this.cellX = cellX;
3205            this.cellY = cellY;
3206        }
3207
3208        public void onAlarm(Alarm alarm) {
3209            if (mDragFolderRingAnimator == null) {
3210                mDragFolderRingAnimator = new FolderRingAnimator(mLauncher, null);
3211            }
3212            mDragFolderRingAnimator.setCell(cellX, cellY);
3213            mDragFolderRingAnimator.setCellLayout(layout);
3214            mDragFolderRingAnimator.animateToAcceptState();
3215            layout.showFolderAccept(mDragFolderRingAnimator);
3216            layout.clearDragOutlines();
3217            setDragMode(DRAG_MODE_CREATE_FOLDER);
3218        }
3219    }
3220
3221    class ReorderAlarmListener implements OnAlarmListener {
3222        float[] dragViewCenter;
3223        int minSpanX, minSpanY, spanX, spanY;
3224        DragView dragView;
3225        View child;
3226
3227        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3228                int spanY, DragView dragView, View child) {
3229            this.dragViewCenter = dragViewCenter;
3230            this.minSpanX = minSpanX;
3231            this.minSpanY = minSpanY;
3232            this.spanX = spanX;
3233            this.spanY = spanY;
3234            this.child = child;
3235            this.dragView = dragView;
3236        }
3237
3238        public void onAlarm(Alarm alarm) {
3239            int[] resultSpan = new int[2];
3240            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3241                    (int) mDragViewVisualCenter[1], spanX, spanY, mDragTargetLayout, mTargetCell);
3242            mLastReorderX = mTargetCell[0];
3243            mLastReorderY = mTargetCell[1];
3244
3245            mTargetCell = mDragTargetLayout.createArea((int) mDragViewVisualCenter[0],
3246                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3247                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3248
3249            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3250                mDragTargetLayout.revertTempState();
3251            } else {
3252                setDragMode(DRAG_MODE_REORDER);
3253            }
3254
3255            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3256            mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3257                (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3258                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize,
3259                dragView.getDragVisualizeOffset(), dragView.getDragRegion());
3260        }
3261    }
3262
3263    @Override
3264    public void getHitRectRelativeToDragLayer(Rect outRect) {
3265        // We want the workspace to have the whole area of the display (it will find the correct
3266        // cell layout to drop to in the existing drag/drop logic.
3267        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3268    }
3269
3270    /**
3271     * Add the item specified by dragInfo to the given layout.
3272     * @return true if successful
3273     */
3274    public boolean addExternalItemToScreen(ItemInfo dragInfo, CellLayout layout) {
3275        if (layout.findCellForSpan(mTempEstimate, dragInfo.spanX, dragInfo.spanY)) {
3276            onDropExternal(dragInfo.dropPos, (ItemInfo) dragInfo, (CellLayout) layout, false);
3277            return true;
3278        }
3279        mLauncher.showOutOfSpaceMessage(mLauncher.isHotseatLayout(layout));
3280        return false;
3281    }
3282
3283    private void onDropExternal(int[] touchXY, Object dragInfo,
3284            CellLayout cellLayout, boolean insertAtFirst) {
3285        onDropExternal(touchXY, dragInfo, cellLayout, insertAtFirst, null);
3286    }
3287
3288    /**
3289     * Drop an item that didn't originate on one of the workspace screens.
3290     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3291     * come from another app altogether.
3292     *
3293     * NOTE: This can also be called when we are outside of a drag event, when we want
3294     * to add an item to one of the workspace screens.
3295     */
3296    private void onDropExternal(final int[] touchXY, final Object dragInfo,
3297            final CellLayout cellLayout, boolean insertAtFirst, DragObject d) {
3298        final Runnable exitSpringLoadedRunnable = new Runnable() {
3299            @Override
3300            public void run() {
3301                mLauncher.exitSpringLoadedDragModeDelayed(true, false, null);
3302            }
3303        };
3304
3305        ItemInfo info = (ItemInfo) dragInfo;
3306        int spanX = info.spanX;
3307        int spanY = info.spanY;
3308        if (mDragInfo != null) {
3309            spanX = mDragInfo.spanX;
3310            spanY = mDragInfo.spanY;
3311        }
3312
3313        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3314                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3315                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3316        final long screenId = getIdForScreen(cellLayout);
3317        if (!mLauncher.isHotseatLayout(cellLayout)
3318                && screenId != getScreenIdForPageIndex(mCurrentPage)
3319                && mState != State.SPRING_LOADED) {
3320            snapToScreenId(screenId, null);
3321        }
3322
3323        if (info instanceof PendingAddItemInfo) {
3324            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo;
3325
3326            boolean findNearestVacantCell = true;
3327            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3328                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3329                        cellLayout, mTargetCell);
3330                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3331                        mDragViewVisualCenter[1], mTargetCell);
3332                if (willCreateUserFolder((ItemInfo) d.dragInfo, cellLayout, mTargetCell,
3333                        distance, true) || willAddToExistingUserFolder((ItemInfo) d.dragInfo,
3334                                cellLayout, mTargetCell, distance)) {
3335                    findNearestVacantCell = false;
3336                }
3337            }
3338
3339            final ItemInfo item = (ItemInfo) d.dragInfo;
3340            boolean updateWidgetSize = false;
3341            if (findNearestVacantCell) {
3342                int minSpanX = item.spanX;
3343                int minSpanY = item.spanY;
3344                if (item.minSpanX > 0 && item.minSpanY > 0) {
3345                    minSpanX = item.minSpanX;
3346                    minSpanY = item.minSpanY;
3347                }
3348                int[] resultSpan = new int[2];
3349                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3350                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3351                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3352
3353                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3354                    updateWidgetSize = true;
3355                }
3356                item.spanX = resultSpan[0];
3357                item.spanY = resultSpan[1];
3358            }
3359
3360            Runnable onAnimationCompleteRunnable = new Runnable() {
3361                @Override
3362                public void run() {
3363                    // When dragging and dropping from customization tray, we deal with creating
3364                    // widgets/shortcuts/folders in a slightly different way
3365                    switch (pendingInfo.itemType) {
3366                    case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
3367                        int span[] = new int[2];
3368                        span[0] = item.spanX;
3369                        span[1] = item.spanY;
3370                        mLauncher.addAppWidgetFromDrop((PendingAddWidgetInfo) pendingInfo,
3371                                container, screenId, mTargetCell, span, null);
3372                        break;
3373                    case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3374                        mLauncher.processShortcutFromDrop(pendingInfo.componentName,
3375                                container, screenId, mTargetCell, null);
3376                        break;
3377                    default:
3378                        throw new IllegalStateException("Unknown item type: " +
3379                                pendingInfo.itemType);
3380                    }
3381                }
3382            };
3383            View finalView = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3384                    ? ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3385
3386            if (finalView instanceof AppWidgetHostView && updateWidgetSize) {
3387                AppWidgetHostView awhv = (AppWidgetHostView) finalView;
3388                AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, item.spanX,
3389                        item.spanY);
3390            }
3391
3392            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3393            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET &&
3394                    ((PendingAddWidgetInfo) pendingInfo).info.configure != null) {
3395                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3396            }
3397            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3398                    animationStyle, finalView, true);
3399        } else {
3400            // This is for other drag/drop cases, like dragging from All Apps
3401            View view = null;
3402
3403            switch (info.itemType) {
3404            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3405            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3406                if (info.container == NO_ID && info instanceof AppInfo) {
3407                    // Came from all apps -- make a copy
3408                    info = new ShortcutInfo((AppInfo) info);
3409                }
3410                view = mLauncher.createShortcut(R.layout.application, cellLayout,
3411                        (ShortcutInfo) info);
3412                break;
3413            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3414                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3415                        (FolderInfo) info, mIconCache);
3416                break;
3417            default:
3418                throw new IllegalStateException("Unknown item type: " + info.itemType);
3419            }
3420
3421            // First we find the cell nearest to point at which the item is
3422            // dropped, without any consideration to whether there is an item there.
3423            if (touchXY != null) {
3424                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3425                        cellLayout, mTargetCell);
3426                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3427                        mDragViewVisualCenter[1], mTargetCell);
3428                d.postAnimationRunnable = exitSpringLoadedRunnable;
3429                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3430                        true, d.dragView, d.postAnimationRunnable)) {
3431                    return;
3432                }
3433                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3434                        true)) {
3435                    return;
3436                }
3437            }
3438
3439            if (touchXY != null) {
3440                // when dragging and dropping, just find the closest free spot
3441                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3442                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3443                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3444            } else {
3445                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3446            }
3447            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1], info.spanX,
3448                    info.spanY, insertAtFirst);
3449            cellLayout.onDropChild(view);
3450            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams();
3451            cellLayout.getShortcutsAndWidgets().measureChild(view);
3452
3453            LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId,
3454                    lp.cellX, lp.cellY);
3455
3456            if (d.dragView != null) {
3457                // We wrap the animation call in the temporary set and reset of the current
3458                // cellLayout to its final transform -- this means we animate the drag view to
3459                // the correct final location.
3460                setFinalTransitionTransform(cellLayout);
3461                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3462                        exitSpringLoadedRunnable);
3463                resetTransitionTransform(cellLayout);
3464            }
3465        }
3466    }
3467
3468    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3469        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo.spanX,
3470                widgetInfo.spanY, widgetInfo, false);
3471        int visibility = layout.getVisibility();
3472        layout.setVisibility(VISIBLE);
3473
3474        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3475        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3476        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3477                Bitmap.Config.ARGB_8888);
3478        Canvas c = new Canvas(b);
3479
3480        layout.measure(width, height);
3481        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3482        layout.draw(c);
3483        c.setBitmap(null);
3484        layout.setVisibility(visibility);
3485        return b;
3486    }
3487
3488    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3489            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell,
3490            boolean external, boolean scale) {
3491        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3492        // location and size on the home screen.
3493        int spanX = info.spanX;
3494        int spanY = info.spanY;
3495
3496        Rect r = estimateItemPosition(layout, info, targetCell[0], targetCell[1], spanX, spanY);
3497        loc[0] = r.left;
3498        loc[1] = r.top;
3499
3500        setFinalTransitionTransform(layout);
3501        float cellLayoutScale =
3502                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3503        resetTransitionTransform(layout);
3504
3505        float dragViewScaleX;
3506        float dragViewScaleY;
3507        if (scale) {
3508            dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3509            dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3510        } else {
3511            dragViewScaleX = 1f;
3512            dragViewScaleY = 1f;
3513        }
3514
3515        // The animation will scale the dragView about its center, so we need to center about
3516        // the final location.
3517        loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2;
3518        loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3519
3520        scaleXY[0] = dragViewScaleX * cellLayoutScale;
3521        scaleXY[1] = dragViewScaleY * cellLayoutScale;
3522    }
3523
3524    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, DragView dragView,
3525            final Runnable onCompleteRunnable, int animationType, final View finalView,
3526            boolean external) {
3527        Rect from = new Rect();
3528        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3529
3530        int[] finalPos = new int[2];
3531        float scaleXY[] = new float[2];
3532        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3533        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3534                external, scalePreview);
3535
3536        Resources res = mLauncher.getResources();
3537        int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3538
3539        // In the case where we've prebound the widget, we remove it from the DragLayer
3540        if (finalView instanceof AppWidgetHostView && external) {
3541            Log.d(TAG, "6557954 Animate widget drop, final view is appWidgetHostView");
3542            mLauncher.getDragLayer().removeView(finalView);
3543        }
3544        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3545            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3546            dragView.setCrossFadeBitmap(crossFadeBitmap);
3547            dragView.crossFade((int) (duration * 0.8f));
3548        } else if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET && external) {
3549            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3550        }
3551
3552        DragLayer dragLayer = mLauncher.getDragLayer();
3553        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3554            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3555                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3556        } else {
3557            int endStyle;
3558            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3559                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3560            } else {
3561                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;;
3562            }
3563
3564            Runnable onComplete = new Runnable() {
3565                @Override
3566                public void run() {
3567                    if (finalView != null) {
3568                        finalView.setVisibility(VISIBLE);
3569                    }
3570                    if (onCompleteRunnable != null) {
3571                        onCompleteRunnable.run();
3572                    }
3573                }
3574            };
3575            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3576                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3577                    duration, this);
3578        }
3579    }
3580
3581    public void setFinalTransitionTransform(CellLayout layout) {
3582        if (isSwitchingState()) {
3583            mCurrentScale = getScaleX();
3584            setScaleX(mNewScale);
3585            setScaleY(mNewScale);
3586        }
3587    }
3588    public void resetTransitionTransform(CellLayout layout) {
3589        if (isSwitchingState()) {
3590            setScaleX(mCurrentScale);
3591            setScaleY(mCurrentScale);
3592        }
3593    }
3594
3595    /**
3596     * Return the current {@link CellLayout}, correctly picking the destination
3597     * screen while a scroll is in progress.
3598     */
3599    public CellLayout getCurrentDropLayout() {
3600        return (CellLayout) getChildAt(getNextPage());
3601    }
3602
3603    /**
3604     * Return the current CellInfo describing our current drag; this method exists
3605     * so that Launcher can sync this object with the correct info when the activity is created/
3606     * destroyed
3607     *
3608     */
3609    public CellLayout.CellInfo getDragInfo() {
3610        return mDragInfo;
3611    }
3612
3613    /**
3614     * Calculate the nearest cell where the given object would be dropped.
3615     *
3616     * pixelX and pixelY should be in the coordinate system of layout
3617     */
3618    private int[] findNearestArea(int pixelX, int pixelY,
3619            int spanX, int spanY, CellLayout layout, int[] recycle) {
3620        return layout.findNearestArea(
3621                pixelX, pixelY, spanX, spanY, recycle);
3622    }
3623
3624    void setup(DragController dragController) {
3625        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3626        mDragController = dragController;
3627
3628        // hardware layers on children are enabled on startup, but should be disabled until
3629        // needed
3630        updateChildrenLayersEnabled(false);
3631        setWallpaperDimension();
3632    }
3633
3634    /**
3635     * Called at the end of a drag which originated on the workspace.
3636     */
3637    public void onDropCompleted(final View target, final DragObject d,
3638            final boolean isFlingToDelete, final boolean success) {
3639        if (mDeferDropAfterUninstall) {
3640            mDeferredAction = new Runnable() {
3641                    public void run() {
3642                        onDropCompleted(target, d, isFlingToDelete, success);
3643                        mDeferredAction = null;
3644                    }
3645                };
3646            return;
3647        }
3648
3649        boolean beingCalledAfterUninstall = mDeferredAction != null;
3650
3651        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3652            if (target != this && mDragInfo != null) {
3653                CellLayout parentCell = getParentCellLayoutForView(mDragInfo.cell);
3654                if (parentCell != null) {
3655                    parentCell.removeView(mDragInfo.cell);
3656                }
3657                if (mDragInfo.cell instanceof DropTarget) {
3658                    mDragController.removeDropTarget((DropTarget) mDragInfo.cell);
3659                }
3660                // If we move the item to anything not on the Workspace, check if any empty
3661                // screens need to be removed. If we dropped back on the workspace, this will
3662                // be done post drop animation.
3663                stripEmptyScreens();
3664            }
3665        } else if (mDragInfo != null) {
3666            CellLayout cellLayout;
3667            if (mLauncher.isHotseatLayout(target)) {
3668                cellLayout = mLauncher.getHotseat().getLayout();
3669            } else {
3670                cellLayout = getScreenWithId(mDragInfo.screenId);
3671            }
3672            cellLayout.onDropChild(mDragInfo.cell);
3673        }
3674        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3675                && mDragInfo.cell != null) {
3676            mDragInfo.cell.setVisibility(VISIBLE);
3677        }
3678        mDragOutline = null;
3679        mDragInfo = null;
3680    }
3681
3682    public void deferCompleteDropAfterUninstallActivity() {
3683        mDeferDropAfterUninstall = true;
3684    }
3685
3686    /// maybe move this into a smaller part
3687    public void onUninstallActivityReturned(boolean success) {
3688        mDeferDropAfterUninstall = false;
3689        mUninstallSuccessful = success;
3690        if (mDeferredAction != null) {
3691            mDeferredAction.run();
3692        }
3693    }
3694
3695    void updateItemLocationsInDatabase(CellLayout cl) {
3696        int count = cl.getShortcutsAndWidgets().getChildCount();
3697
3698        long screenId = getIdForScreen(cl);
3699        int container = Favorites.CONTAINER_DESKTOP;
3700
3701        if (mLauncher.isHotseatLayout(cl)) {
3702            screenId = -1;
3703            container = Favorites.CONTAINER_HOTSEAT;
3704        }
3705
3706        for (int i = 0; i < count; i++) {
3707            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3708            ItemInfo info = (ItemInfo) v.getTag();
3709            // Null check required as the AllApps button doesn't have an item info
3710            if (info != null && info.requiresDbUpdate) {
3711                info.requiresDbUpdate = false;
3712                LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, info.cellX,
3713                        info.cellY, info.spanX, info.spanY);
3714            }
3715        }
3716    }
3717
3718    ArrayList<ComponentName> getUniqueComponents(boolean stripDuplicates, ArrayList<ComponentName> duplicates) {
3719        ArrayList<ComponentName> uniqueIntents = new ArrayList<ComponentName>();
3720        getUniqueIntents((CellLayout) mLauncher.getHotseat().getLayout(), uniqueIntents, duplicates, false);
3721        int count = getChildCount();
3722        for (int i = 0; i < count; i++) {
3723            CellLayout cl = (CellLayout) getChildAt(i);
3724            getUniqueIntents(cl, uniqueIntents, duplicates, false);
3725        }
3726        return uniqueIntents;
3727    }
3728
3729    void getUniqueIntents(CellLayout cl, ArrayList<ComponentName> uniqueIntents,
3730            ArrayList<ComponentName> duplicates, boolean stripDuplicates) {
3731        int count = cl.getShortcutsAndWidgets().getChildCount();
3732
3733        ArrayList<View> children = new ArrayList<View>();
3734        for (int i = 0; i < count; i++) {
3735            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3736            children.add(v);
3737        }
3738
3739        for (int i = 0; i < count; i++) {
3740            View v = children.get(i);
3741            ItemInfo info = (ItemInfo) v.getTag();
3742            // Null check required as the AllApps button doesn't have an item info
3743            if (info instanceof ShortcutInfo) {
3744                ShortcutInfo si = (ShortcutInfo) info;
3745                ComponentName cn = si.intent.getComponent();
3746
3747                Uri dataUri = si.intent.getData();
3748                // If dataUri is not null / empty or if this component isn't one that would
3749                // have previously showed up in the AllApps list, then this is a widget-type
3750                // shortcut, so ignore it.
3751                if (dataUri != null && !dataUri.equals(Uri.EMPTY)) {
3752                    continue;
3753                }
3754
3755                if (!uniqueIntents.contains(cn)) {
3756                    uniqueIntents.add(cn);
3757                } else {
3758                    if (stripDuplicates) {
3759                        cl.removeViewInLayout(v);
3760                        LauncherModel.deleteItemFromDatabase(mLauncher, si);
3761                    }
3762                    if (duplicates != null) {
3763                        duplicates.add(cn);
3764                    }
3765                }
3766            }
3767            if (v instanceof FolderIcon) {
3768                FolderIcon fi = (FolderIcon) v;
3769                ArrayList<View> items = fi.getFolder().getItemsInReadingOrder();
3770                for (int j = 0; j < items.size(); j++) {
3771                    if (items.get(j).getTag() instanceof ShortcutInfo) {
3772                        ShortcutInfo si = (ShortcutInfo) items.get(j).getTag();
3773                        ComponentName cn = si.intent.getComponent();
3774
3775                        Uri dataUri = si.intent.getData();
3776                        // If dataUri is not null / empty or if this component isn't one that would
3777                        // have previously showed up in the AllApps list, then this is a widget-type
3778                        // shortcut, so ignore it.
3779                        if (dataUri != null && !dataUri.equals(Uri.EMPTY)) {
3780                            continue;
3781                        }
3782
3783                        if (!uniqueIntents.contains(cn)) {
3784                            uniqueIntents.add(cn);
3785                        }  else {
3786                            if (stripDuplicates) {
3787                                fi.getFolderInfo().remove(si);
3788                                LauncherModel.deleteItemFromDatabase(mLauncher, si);
3789                            }
3790                            if (duplicates != null) {
3791                                duplicates.add(cn);
3792                            }
3793                        }
3794                    }
3795                }
3796            }
3797        }
3798    }
3799
3800    void saveWorkspaceToDb() {
3801        saveWorkspaceScreenToDb((CellLayout) mLauncher.getHotseat().getLayout());
3802        int count = getChildCount();
3803        for (int i = 0; i < count; i++) {
3804            CellLayout cl = (CellLayout) getChildAt(i);
3805            saveWorkspaceScreenToDb(cl);
3806        }
3807    }
3808
3809    void saveWorkspaceScreenToDb(CellLayout cl) {
3810        int count = cl.getShortcutsAndWidgets().getChildCount();
3811
3812        long screenId = getIdForScreen(cl);
3813        int container = Favorites.CONTAINER_DESKTOP;
3814
3815        Hotseat hotseat = mLauncher.getHotseat();
3816        if (mLauncher.isHotseatLayout(cl)) {
3817            screenId = -1;
3818            container = Favorites.CONTAINER_HOTSEAT;
3819        }
3820
3821        for (int i = 0; i < count; i++) {
3822            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3823            ItemInfo info = (ItemInfo) v.getTag();
3824            // Null check required as the AllApps button doesn't have an item info
3825            if (info != null) {
3826                int cellX = info.cellX;
3827                int cellY = info.cellY;
3828                if (container == Favorites.CONTAINER_HOTSEAT) {
3829                    cellX = hotseat.getCellXFromOrder((int) info.screenId);
3830                    cellY = hotseat.getCellYFromOrder((int) info.screenId);
3831                }
3832                LauncherModel.addItemToDatabase(mLauncher, info, container, screenId, cellX,
3833                        cellY, false);
3834            }
3835            if (v instanceof FolderIcon) {
3836                FolderIcon fi = (FolderIcon) v;
3837                fi.getFolder().addItemLocationsInDatabase();
3838            }
3839        }
3840    }
3841
3842    @Override
3843    public boolean supportsFlingToDelete() {
3844        return true;
3845    }
3846
3847    @Override
3848    public void onFlingToDelete(DragObject d, int x, int y, PointF vec) {
3849        // Do nothing
3850    }
3851
3852    @Override
3853    public void onFlingToDeleteCompleted() {
3854        // Do nothing
3855    }
3856
3857    public boolean isDropEnabled() {
3858        return true;
3859    }
3860
3861    @Override
3862    protected void onRestoreInstanceState(Parcelable state) {
3863        super.onRestoreInstanceState(state);
3864        Launcher.setScreen(mCurrentPage);
3865    }
3866
3867    @Override
3868    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
3869        // We don't dispatch restoreInstanceState to our children using this code path.
3870        // Some pages will be restored immediately as their items are bound immediately, and
3871        // others we will need to wait until after their items are bound.
3872        mSavedStates = container;
3873    }
3874
3875    public void restoreInstanceStateForChild(int child) {
3876        if (mSavedStates != null) {
3877            mRestoredPages.add(child);
3878            CellLayout cl = (CellLayout) getChildAt(child);
3879            cl.restoreInstanceState(mSavedStates);
3880        }
3881    }
3882
3883    public void restoreInstanceStateForRemainingPages() {
3884        int count = getChildCount();
3885        for (int i = 0; i < count; i++) {
3886            if (!mRestoredPages.contains(i)) {
3887                restoreInstanceStateForChild(i);
3888            }
3889        }
3890        mRestoredPages.clear();
3891    }
3892
3893    @Override
3894    public void scrollLeft() {
3895        if (!isSmall() && !mIsSwitchingState) {
3896            super.scrollLeft();
3897        }
3898        Folder openFolder = getOpenFolder();
3899        if (openFolder != null) {
3900            openFolder.completeDragExit();
3901        }
3902    }
3903
3904    @Override
3905    public void scrollRight() {
3906        if (!isSmall() && !mIsSwitchingState) {
3907            super.scrollRight();
3908        }
3909        Folder openFolder = getOpenFolder();
3910        if (openFolder != null) {
3911            openFolder.completeDragExit();
3912        }
3913    }
3914
3915    @Override
3916    public boolean onEnterScrollArea(int x, int y, int direction) {
3917        // Ignore the scroll area if we are dragging over the hot seat
3918        boolean isPortrait = !LauncherAppState.isScreenLandscape(getContext());
3919        if (mLauncher.getHotseat() != null && isPortrait) {
3920            Rect r = new Rect();
3921            mLauncher.getHotseat().getHitRect(r);
3922            if (r.contains(x, y)) {
3923                return false;
3924            }
3925        }
3926
3927        boolean result = false;
3928        if (!isSmall() && !mIsSwitchingState && getOpenFolder() == null) {
3929            mInScrollArea = true;
3930
3931            final int page = getNextPage() +
3932                       (direction == DragController.SCROLL_LEFT ? -1 : 1);
3933            // We always want to exit the current layout to ensure parity of enter / exit
3934            setCurrentDropLayout(null);
3935
3936            if (0 <= page && page < getChildCount()) {
3937                // Ensure that we are not dragging over to the custom content screen
3938                if (getScreenIdForPageIndex(page) == CUSTOM_CONTENT_SCREEN_ID) {
3939                    return false;
3940                }
3941
3942                CellLayout layout = (CellLayout) getChildAt(page);
3943                setCurrentDragOverlappingLayout(layout);
3944
3945                // Workspace is responsible for drawing the edge glow on adjacent pages,
3946                // so we need to redraw the workspace when this may have changed.
3947                invalidate();
3948                result = true;
3949            }
3950        }
3951        return result;
3952    }
3953
3954    @Override
3955    public boolean onExitScrollArea() {
3956        boolean result = false;
3957        if (mInScrollArea) {
3958            invalidate();
3959            CellLayout layout = getCurrentDropLayout();
3960            setCurrentDropLayout(layout);
3961            setCurrentDragOverlappingLayout(layout);
3962
3963            result = true;
3964            mInScrollArea = false;
3965        }
3966        return result;
3967    }
3968
3969    private void onResetScrollArea() {
3970        setCurrentDragOverlappingLayout(null);
3971        mInScrollArea = false;
3972    }
3973
3974    /**
3975     * Returns a specific CellLayout
3976     */
3977    CellLayout getParentCellLayoutForView(View v) {
3978        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
3979        for (CellLayout layout : layouts) {
3980            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
3981                return layout;
3982            }
3983        }
3984        return null;
3985    }
3986
3987    /**
3988     * Returns a list of all the CellLayouts in the workspace.
3989     */
3990    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
3991        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
3992        int screenCount = getChildCount();
3993        for (int screen = 0; screen < screenCount; screen++) {
3994            layouts.add(((CellLayout) getChildAt(screen)));
3995        }
3996        if (mLauncher.getHotseat() != null) {
3997            layouts.add(mLauncher.getHotseat().getLayout());
3998        }
3999        return layouts;
4000    }
4001
4002    /**
4003     * We should only use this to search for specific children.  Do not use this method to modify
4004     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
4005     * the hotseat and workspace pages
4006     */
4007    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
4008        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4009                new ArrayList<ShortcutAndWidgetContainer>();
4010        int screenCount = getChildCount();
4011        for (int screen = 0; screen < screenCount; screen++) {
4012            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
4013        }
4014        if (mLauncher.getHotseat() != null) {
4015            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
4016        }
4017        return childrenLayouts;
4018    }
4019
4020    public Folder getFolderForTag(Object tag) {
4021        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4022                getAllShortcutAndWidgetContainers();
4023        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4024            int count = layout.getChildCount();
4025            for (int i = 0; i < count; i++) {
4026                View child = layout.getChildAt(i);
4027                if (child instanceof Folder) {
4028                    Folder f = (Folder) child;
4029                    if (f.getInfo() == tag && f.getInfo().opened) {
4030                        return f;
4031                    }
4032                }
4033            }
4034        }
4035        return null;
4036    }
4037
4038    public View getViewForTag(Object tag) {
4039        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4040                getAllShortcutAndWidgetContainers();
4041        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4042            int count = layout.getChildCount();
4043            for (int i = 0; i < count; i++) {
4044                View child = layout.getChildAt(i);
4045                if (child.getTag() == tag) {
4046                    return child;
4047                }
4048            }
4049        }
4050        return null;
4051    }
4052
4053    void clearDropTargets() {
4054        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4055                getAllShortcutAndWidgetContainers();
4056        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4057            int childCount = layout.getChildCount();
4058            for (int j = 0; j < childCount; j++) {
4059                View v = layout.getChildAt(j);
4060                if (v instanceof DropTarget) {
4061                    mDragController.removeDropTarget((DropTarget) v);
4062                }
4063            }
4064        }
4065    }
4066
4067    // Removes ALL items that match a given package name, this is usually called when a package
4068    // has been removed and we want to remove all components (widgets, shortcuts, apps) that
4069    // belong to that package.
4070    void removeItemsByPackageName(final ArrayList<String> packages) {
4071        final HashSet<String> packageNames = new HashSet<String>();
4072        packageNames.addAll(packages);
4073
4074        // Filter out all the ItemInfos that this is going to affect
4075        final HashSet<ItemInfo> infos = new HashSet<ItemInfo>();
4076        final HashSet<ComponentName> cns = new HashSet<ComponentName>();
4077        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
4078        for (CellLayout layoutParent : cellLayouts) {
4079            ViewGroup layout = layoutParent.getShortcutsAndWidgets();
4080            int childCount = layout.getChildCount();
4081            for (int i = 0; i < childCount; ++i) {
4082                View view = layout.getChildAt(i);
4083                infos.add((ItemInfo) view.getTag());
4084            }
4085        }
4086        LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
4087            @Override
4088            public boolean filterItem(ItemInfo parent, ItemInfo info,
4089                                      ComponentName cn) {
4090                if (packageNames.contains(cn.getPackageName())) {
4091                    cns.add(cn);
4092                    return true;
4093                }
4094                return false;
4095            }
4096        };
4097        LauncherModel.filterItemInfos(infos, filter);
4098
4099        // Remove the affected components
4100        removeItemsByComponentName(cns);
4101    }
4102
4103    // Removes items that match the application info specified, when applications are removed
4104    // as a part of an update, this is called to ensure that other widgets and application
4105    // shortcuts are not removed.
4106    void removeItemsByApplicationInfo(final ArrayList<AppInfo> appInfos) {
4107        // Just create a hash table of all the specific components that this will affect
4108        HashSet<ComponentName> cns = new HashSet<ComponentName>();
4109        for (AppInfo info : appInfos) {
4110            cns.add(info.componentName);
4111        }
4112
4113        // Remove all the things
4114        removeItemsByComponentName(cns);
4115    }
4116
4117    void removeItemsByComponentName(final HashSet<ComponentName> componentNames) {
4118        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
4119        for (final CellLayout layoutParent: cellLayouts) {
4120            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
4121
4122            final HashMap<ItemInfo, View> children = new HashMap<ItemInfo, View>();
4123            for (int j = 0; j < layout.getChildCount(); j++) {
4124                final View view = layout.getChildAt(j);
4125                children.put((ItemInfo) view.getTag(), view);
4126            }
4127
4128            final ArrayList<View> childrenToRemove = new ArrayList<View>();
4129            final HashMap<FolderInfo, ArrayList<ShortcutInfo>> folderAppsToRemove =
4130                    new HashMap<FolderInfo, ArrayList<ShortcutInfo>>();
4131            LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
4132                @Override
4133                public boolean filterItem(ItemInfo parent, ItemInfo info,
4134                                          ComponentName cn) {
4135                    if (parent instanceof FolderInfo) {
4136                        if (componentNames.contains(cn)) {
4137                            FolderInfo folder = (FolderInfo) parent;
4138                            ArrayList<ShortcutInfo> appsToRemove;
4139                            if (folderAppsToRemove.containsKey(folder)) {
4140                                appsToRemove = folderAppsToRemove.get(folder);
4141                            } else {
4142                                appsToRemove = new ArrayList<ShortcutInfo>();
4143                                folderAppsToRemove.put(folder, appsToRemove);
4144                            }
4145                            appsToRemove.add((ShortcutInfo) info);
4146                            return true;
4147                        }
4148                    } else {
4149                        if (componentNames.contains(cn)) {
4150                            childrenToRemove.add(children.get(info));
4151                            return true;
4152                        }
4153                    }
4154                    return false;
4155                }
4156            };
4157            LauncherModel.filterItemInfos(children.keySet(), filter);
4158
4159            // Remove all the apps from their folders
4160            for (FolderInfo folder : folderAppsToRemove.keySet()) {
4161                ArrayList<ShortcutInfo> appsToRemove = folderAppsToRemove.get(folder);
4162                for (ShortcutInfo info : appsToRemove) {
4163                    folder.remove(info);
4164                }
4165            }
4166
4167            // Remove all the other children
4168            for (View child : childrenToRemove) {
4169                // Note: We can not remove the view directly from CellLayoutChildren as this
4170                // does not re-mark the spaces as unoccupied.
4171                layoutParent.removeViewInLayout(child);
4172                if (child instanceof DropTarget) {
4173                    mDragController.removeDropTarget((DropTarget) child);
4174                }
4175            }
4176
4177            if (childrenToRemove.size() > 0) {
4178                layout.requestLayout();
4179                layout.invalidate();
4180            }
4181        }
4182
4183        // Strip all the empty screens
4184        stripEmptyScreens();
4185    }
4186
4187    void updateShortcuts(ArrayList<AppInfo> apps) {
4188        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = getAllShortcutAndWidgetContainers();
4189        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4190            int childCount = layout.getChildCount();
4191            for (int j = 0; j < childCount; j++) {
4192                final View view = layout.getChildAt(j);
4193                Object tag = view.getTag();
4194
4195                if (LauncherModel.isShortcutInfoUpdateable((ItemInfo) tag)) {
4196                    ShortcutInfo info = (ShortcutInfo) tag;
4197
4198                    final Intent intent = info.intent;
4199                    final ComponentName name = intent.getComponent();
4200                    final int appCount = apps.size();
4201                    for (int k = 0; k < appCount; k++) {
4202                        AppInfo app = apps.get(k);
4203                        if (app.componentName.equals(name)) {
4204                            BubbleTextView shortcut = (BubbleTextView) view;
4205                            info.updateIcon(mIconCache);
4206                            info.title = app.title.toString();
4207                            shortcut.applyFromShortcutInfo(info, mIconCache);
4208                        }
4209                    }
4210                }
4211            }
4212        }
4213    }
4214
4215    private void moveToScreen(int page, boolean animate) {
4216        if (!isSmall()) {
4217            if (animate) {
4218                snapToPage(page);
4219            } else {
4220                setCurrentPage(page);
4221            }
4222        }
4223        View child = getChildAt(page);
4224        if (child != null) {
4225            child.requestFocus();
4226        }
4227    }
4228
4229    void moveToDefaultScreen(boolean animate) {
4230        moveToScreen(mDefaultPage, animate);
4231    }
4232
4233    void moveToCustomContentScreen(boolean animate) {
4234        if (hasCustomContent()) {
4235            int ccIndex = getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID);
4236            if (animate) {
4237                snapToPage(ccIndex);
4238            } else {
4239                setCurrentPage(ccIndex);
4240            }
4241            View child = getChildAt(ccIndex);
4242            if (child != null) {
4243                child.requestFocus();
4244            }
4245         }
4246    }
4247
4248    @Override
4249    protected PageIndicator.PageMarkerResources getPageIndicatorMarker(int pageIndex) {
4250        long screenId = getScreenIdForPageIndex(pageIndex);
4251        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
4252            int count = mScreenOrder.size() - (hasCustomContent() ? 1 : 0);
4253            if (count > 1) {
4254                return new PageIndicator.PageMarkerResources(R.drawable.ic_pageindicator_add,
4255                        R.drawable.ic_pageindicator_add);
4256            }
4257        }
4258
4259        return super.getPageIndicatorMarker(pageIndex);
4260    }
4261
4262    @Override
4263    public void syncPages() {
4264    }
4265
4266    @Override
4267    public void syncPageItems(int page, boolean immediate) {
4268    }
4269
4270    protected String getCurrentPageDescription() {
4271        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4272        return String.format(getContext().getString(R.string.workspace_scroll_format),
4273                page + 1, getChildCount());
4274    }
4275
4276    public void getLocationInDragLayer(int[] loc) {
4277        mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
4278    }
4279}
4280