Workspace.java revision 2702ea006084a441f085c779ff77be1128a19bad 
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.res.Resources;
34import android.content.res.TypedArray;
35import android.graphics.Bitmap;
36import android.graphics.Canvas;
37import android.graphics.Matrix;
38import android.graphics.Point;
39import android.graphics.PointF;
40import android.graphics.Rect;
41import android.graphics.Region.Op;
42import android.graphics.drawable.Drawable;
43import android.os.IBinder;
44import android.os.Parcelable;
45import android.util.AttributeSet;
46import android.util.Log;
47import android.util.SparseArray;
48import android.view.Display;
49import android.view.MotionEvent;
50import android.view.View;
51import android.view.ViewGroup;
52import android.view.animation.DecelerateInterpolator;
53import android.widget.ImageView;
54import android.widget.TextView;
55
56import com.android.launcher3.FolderIcon.FolderRingAnimator;
57import com.android.launcher3.Launcher.CustomContentCallbacks;
58import com.android.launcher3.LauncherSettings.Favorites;
59
60import java.util.ArrayList;
61import java.util.HashMap;
62import java.util.HashSet;
63import java.util.Iterator;
64
65/**
66 * The workspace is a wide area with a wallpaper and a finite number of pages.
67 * Each page contains a number of icons, folders or widgets the user can
68 * interact with. A workspace is meant to be used with a fixed width only.
69 */
70public class Workspace extends SmoothPagedView
71        implements DropTarget, DragSource, DragScroller, View.OnTouchListener,
72        DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener {
73    private static final String TAG = "Launcher.Workspace";
74
75    // Y rotation to apply to the workspace screens
76    private static final float WORKSPACE_OVERSCROLL_ROTATION = 24f;
77
78    private static final int CHILDREN_OUTLINE_FADE_OUT_DELAY = 0;
79    private static final int CHILDREN_OUTLINE_FADE_OUT_DURATION = 375;
80    private static final int CHILDREN_OUTLINE_FADE_IN_DURATION = 100;
81
82    private static final int BACKGROUND_FADE_OUT_DURATION = 350;
83    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
84    private static final int FLING_THRESHOLD_VELOCITY = 500;
85
86    private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
87
88    // These animators are used to fade the children's outlines
89    private ObjectAnimator mChildrenOutlineFadeInAnimation;
90    private ObjectAnimator mChildrenOutlineFadeOutAnimation;
91    private float mChildrenOutlineAlpha = 0;
92
93    // These properties refer to the background protection gradient used for AllApps and Customize
94    private ValueAnimator mBackgroundFadeInAnimation;
95    private ValueAnimator mBackgroundFadeOutAnimation;
96    private Drawable mBackground;
97    boolean mDrawBackground = true;
98    private float mBackgroundAlpha = 0;
99
100    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
101    private long mTouchDownTime = -1;
102    private long mCustomContentShowTime = -1;
103
104    private LayoutTransition mLayoutTransition;
105    private final WallpaperManager mWallpaperManager;
106    private IBinder mWindowToken;
107    private static final float WALLPAPER_SCREENS_SPAN = 2f;
108
109    private int mDefaultPage;
110
111    // The screen id used for the empty screen always present to the right.
112    private final static long EXTRA_EMPTY_SCREEN_ID = -201;
113    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
114
115    private HashMap<Long, CellLayout> mWorkspaceScreens = new HashMap<Long, CellLayout>();
116    private ArrayList<Long> mScreenOrder = new ArrayList<Long>();
117
118    /**
119     * CellInfo for the cell that is currently being dragged
120     */
121    private CellLayout.CellInfo mDragInfo;
122
123    /**
124     * Target drop area calculated during last acceptDrop call.
125     */
126    private int[] mTargetCell = new int[2];
127    private int mDragOverX = -1;
128    private int mDragOverY = -1;
129
130    static Rect mLandscapeCellLayoutMetrics = null;
131    static Rect mPortraitCellLayoutMetrics = null;
132
133    CustomContentCallbacks mCustomContentCallbacks;
134    boolean mCustomContentShowing;
135
136    /**
137     * The CellLayout that is currently being dragged over
138     */
139    private CellLayout mDragTargetLayout = null;
140    /**
141     * The CellLayout that we will show as glowing
142     */
143    private CellLayout mDragOverlappingLayout = null;
144
145    /**
146     * The CellLayout which will be dropped to
147     */
148    private CellLayout mDropToLayout = null;
149
150    private Launcher mLauncher;
151    private IconCache mIconCache;
152    private DragController mDragController;
153
154    // These are temporary variables to prevent having to allocate a new object just to
155    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
156    private int[] mTempCell = new int[2];
157    private int[] mTempPt = new int[2];
158    private int[] mTempEstimate = new int[2];
159    private float[] mDragViewVisualCenter = new float[2];
160    private float[] mTempCellLayoutCenterCoordinates = new float[2];
161    private Matrix mTempInverseMatrix = new Matrix();
162
163    private SpringLoadedDragController mSpringLoadedDragController;
164    private float mSpringLoadedShrinkFactor;
165    private float mOverviewModeShrinkFactor;
166
167    private static final int DEFAULT_CELL_COUNT_X = 4;
168    private static final int DEFAULT_CELL_COUNT_Y = 4;
169
170    // State variable that indicates whether the pages are small (ie when you're
171    // in all apps or customize mode)
172
173    enum State { NORMAL, SPRING_LOADED, SMALL, OVERVIEW};
174    private State mState = State.NORMAL;
175    private boolean mIsSwitchingState = false;
176
177    boolean mAnimatingViewIntoPlace = false;
178    boolean mIsDragOccuring = false;
179    boolean mChildrenLayersEnabled = true;
180
181    private boolean mStripScreensOnPageStopMoving = false;
182
183    /** Is the user is dragging an item near the edge of a page? */
184    private boolean mInScrollArea = false;
185
186    private HolographicOutlineHelper mOutlineHelper;
187    private Bitmap mDragOutline = null;
188    private final Rect mTempRect = new Rect();
189    private final int[] mTempXY = new int[2];
190    private int[] mTempVisiblePagesRange = new int[2];
191    private float mOverscrollFade = 0;
192    private boolean mOverscrollTransformsSet;
193    public static final int DRAG_BITMAP_PADDING = 2;
194    private boolean mWorkspaceFadeInAdjacentScreens;
195
196    enum WallpaperVerticalOffset { TOP, MIDDLE, BOTTOM };
197    int mWallpaperWidth;
198    int mWallpaperHeight;
199    WallpaperOffsetInterpolator mWallpaperOffset;
200    boolean mUpdateWallpaperOffsetImmediately = false;
201    private Runnable mDelayedResizeRunnable;
202    private Runnable mDelayedSnapToPageRunnable;
203    private Point mDisplaySize = new Point();
204    private boolean mIsStaticWallpaper;
205    private int mWallpaperTravelWidth;
206    private int mCameraDistance;
207
208    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
209    private static final int FOLDER_CREATION_TIMEOUT = 0;
210    private static final int REORDER_TIMEOUT = 250;
211    private final Alarm mFolderCreationAlarm = new Alarm();
212    private final Alarm mReorderAlarm = new Alarm();
213    private FolderRingAnimator mDragFolderRingAnimator = null;
214    private FolderIcon mDragOverFolderIcon = null;
215    private boolean mCreateUserFolderOnDrop = false;
216    private boolean mAddToExistingFolderOnDrop = false;
217    private DropTarget.DragEnforcer mDragEnforcer;
218    private float mMaxDistanceForFolderCreation;
219
220    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
221    private float mXDown;
222    private float mYDown;
223    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
224    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
225    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
226
227    // Relating to the animation of items being dropped externally
228    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
229    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
230    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
231    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
232    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
233
234    // Related to dragging, folder creation and reordering
235    private static final int DRAG_MODE_NONE = 0;
236    private static final int DRAG_MODE_CREATE_FOLDER = 1;
237    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
238    private static final int DRAG_MODE_REORDER = 3;
239    private int mDragMode = DRAG_MODE_NONE;
240    private int mLastReorderX = -1;
241    private int mLastReorderY = -1;
242
243    private SparseArray<Parcelable> mSavedStates;
244    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
245
246    // These variables are used for storing the initial and final values during workspace animations
247    private int mSavedScrollX;
248    private float mSavedRotationY;
249    private float mSavedTranslationX;
250
251    private float mCurrentScale;
252    private float mNewScale;
253    private float[] mOldBackgroundAlphas;
254    private float[] mOldAlphas;
255    private float[] mNewBackgroundAlphas;
256    private float[] mNewAlphas;
257    private int mLastChildCount = -1;
258    private float mTransitionProgress;
259
260    private Runnable mDeferredAction;
261    private boolean mDeferDropAfterUninstall;
262    private boolean mUninstallSuccessful;
263
264    private final Runnable mBindPages = new Runnable() {
265        @Override
266        public void run() {
267            mLauncher.getModel().bindRemainingSynchronousPages();
268        }
269    };
270
271    /**
272     * Used to inflate the Workspace from XML.
273     *
274     * @param context The application's context.
275     * @param attrs The attributes set containing the Workspace's customization values.
276     */
277    public Workspace(Context context, AttributeSet attrs) {
278        this(context, attrs, 0);
279    }
280
281    /**
282     * Used to inflate the Workspace from XML.
283     *
284     * @param context The application's context.
285     * @param attrs The attributes set containing the Workspace's customization values.
286     * @param defStyle Unused.
287     */
288    public Workspace(Context context, AttributeSet attrs, int defStyle) {
289        super(context, attrs, defStyle);
290        mContentIsRefreshable = false;
291
292        mOutlineHelper = HolographicOutlineHelper.obtain(context);
293
294        mDragEnforcer = new DropTarget.DragEnforcer(context);
295        // With workspace, data is available straight from the get-go
296        setDataIsReady();
297
298        mLauncher = (Launcher) context;
299        final Resources res = getResources();
300        mWorkspaceFadeInAdjacentScreens = res.getBoolean(R.bool.config_workspaceFadeAdjacentScreens);
301        mFadeInAdjacentScreens = false;
302        mWallpaperManager = WallpaperManager.getInstance(context);
303
304        int cellCountX = DEFAULT_CELL_COUNT_X;
305        int cellCountY = DEFAULT_CELL_COUNT_Y;
306
307        TypedArray a = context.obtainStyledAttributes(attrs,
308                R.styleable.Workspace, defStyle, 0);
309
310        if (LauncherAppState.getInstance().isScreenLarge()) {
311            // Determine number of rows/columns dynamically
312            // TODO: This code currently fails on tablets with an aspect ratio < 1.3.
313            // Around that ratio we should make cells the same size in portrait and
314            // landscape
315            TypedArray actionBarSizeTypedArray =
316                context.obtainStyledAttributes(new int[] { android.R.attr.actionBarSize });
317            final float actionBarHeight = actionBarSizeTypedArray.getDimension(0, 0f);
318
319            Point minDims = new Point();
320            Point maxDims = new Point();
321            mLauncher.getWindowManager().getDefaultDisplay().getCurrentSizeRange(minDims, maxDims);
322
323            cellCountX = 1;
324            while (CellLayout.widthInPortrait(res, cellCountX + 1) <= minDims.x) {
325                cellCountX++;
326            }
327
328            cellCountY = 1;
329            while (actionBarHeight + CellLayout.heightInLandscape(res, cellCountY + 1)
330                <= minDims.y) {
331                cellCountY++;
332            }
333        }
334
335        mSpringLoadedShrinkFactor =
336            res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f;
337        mOverviewModeShrinkFactor =
338                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100.0f;
339        mCameraDistance = res.getInteger(R.integer.config_cameraDistance);
340
341        // if the value is manually specified, use that instead
342        cellCountX = a.getInt(R.styleable.Workspace_cellCountX, cellCountX);
343        cellCountY = a.getInt(R.styleable.Workspace_cellCountY, cellCountY);
344        mDefaultPage = a.getInt(R.styleable.Workspace_defaultScreen, 1);
345        a.recycle();
346
347        setOnHierarchyChangeListener(this);
348
349        LauncherModel.updateWorkspaceLayoutCells(cellCountX, cellCountY);
350        setHapticFeedbackEnabled(false);
351
352        initWorkspace();
353
354        // Disable multitouch across the workspace/all apps/customize tray
355        setMotionEventSplittingEnabled(true);
356
357        // Unless otherwise specified this view is important for accessibility.
358        if (getImportantForAccessibility() == View.IMPORTANT_FOR_ACCESSIBILITY_AUTO) {
359            setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
360        }
361    }
362
363    // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each
364    // dimension if unsuccessful
365    public int[] estimateItemSize(int hSpan, int vSpan,
366            ItemInfo itemInfo, boolean springLoaded) {
367        int[] size = new int[2];
368        if (getChildCount() > 0) {
369            CellLayout cl = (CellLayout) mLauncher.getWorkspace().getChildAt(0);
370            Rect r = estimateItemPosition(cl, itemInfo, 0, 0, hSpan, vSpan);
371            size[0] = r.width();
372            size[1] = r.height();
373            if (springLoaded) {
374                size[0] *= mSpringLoadedShrinkFactor;
375                size[1] *= mSpringLoadedShrinkFactor;
376            }
377            return size;
378        } else {
379            size[0] = Integer.MAX_VALUE;
380            size[1] = Integer.MAX_VALUE;
381            return size;
382        }
383    }
384
385    public Rect estimateItemPosition(CellLayout cl, ItemInfo pendingInfo,
386            int hCell, int vCell, int hSpan, int vSpan) {
387        Rect r = new Rect();
388        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
389        return r;
390    }
391
392    public void onDragStart(DragSource source, Object info, int dragAction) {
393        mIsDragOccuring = true;
394        updateChildrenLayersEnabled(false);
395        mLauncher.lockScreenOrientation();
396        setChildrenBackgroundAlphaMultipliers(1f);
397        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
398        InstallShortcutReceiver.enableInstallQueue();
399        UninstallShortcutReceiver.enableUninstallQueue();
400    }
401
402    public void onDragEnd() {
403        mIsDragOccuring = false;
404        updateChildrenLayersEnabled(false);
405        mLauncher.unlockScreenOrientation(false);
406
407        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
408        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
409        UninstallShortcutReceiver.disableAndFlushUninstallQueue(getContext());
410    }
411
412    /**
413     * Initializes various states for this workspace.
414     */
415    protected void initWorkspace() {
416        Context context = getContext();
417        mCurrentPage = mDefaultPage;
418        Launcher.setScreen(mCurrentPage);
419        LauncherAppState app = LauncherAppState.getInstance();
420        mIconCache = app.getIconCache();
421        setWillNotDraw(false);
422        setClipChildren(false);
423        setClipToPadding(false);
424        setChildrenDrawnWithCacheEnabled(true);
425        setMinScale(0.5f);
426        setupLayoutTransition();
427
428        final Resources res = getResources();
429        try {
430            mBackground = res.getDrawable(R.drawable.apps_customize_bg);
431        } catch (Resources.NotFoundException e) {
432            // In this case, we will skip drawing background protection
433        }
434
435        mWallpaperOffset = new WallpaperOffsetInterpolator();
436        Display display = mLauncher.getWindowManager().getDefaultDisplay();
437        display.getSize(mDisplaySize);
438        mWallpaperTravelWidth = (int) (mDisplaySize.x *
439                wallpaperTravelToScreenWidthRatio(mDisplaySize.x, mDisplaySize.y));
440
441        mMaxDistanceForFolderCreation = (0.55f * res.getDimensionPixelSize(R.dimen.app_icon_size));
442        mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
443    }
444
445    private void setupLayoutTransition() {
446        // We want to show layout transitions when pages are deleted, to close the gap.
447        mLayoutTransition = new LayoutTransition();
448        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
449        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
450        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
451        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
452        setLayoutTransition(mLayoutTransition);
453    }
454
455    @Override
456    protected int getScrollMode() {
457        return SmoothPagedView.X_LARGE_MODE;
458    }
459
460    @Override
461    public void onChildViewAdded(View parent, View child) {
462        if (!(child instanceof CellLayout)) {
463            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
464        }
465        CellLayout cl = ((CellLayout) child);
466        cl.setOnInterceptTouchListener(this);
467        cl.setClickable(true);
468        cl.setContentDescription(getContext().getString(
469                R.string.workspace_description_format, getChildCount()));
470
471        super.onChildViewAdded(parent, child);
472    }
473
474    protected boolean shouldDrawChild(View child) {
475        final CellLayout cl = (CellLayout) child;
476        return super.shouldDrawChild(child) &&
477            (cl.getShortcutsAndWidgets().getAlpha() > 0 ||
478             cl.getBackgroundAlpha() > 0);
479    }
480
481    /**
482     * @return The open folder on the current screen, or null if there is none
483     */
484    Folder getOpenFolder() {
485        DragLayer dragLayer = mLauncher.getDragLayer();
486        int count = dragLayer.getChildCount();
487        for (int i = 0; i < count; i++) {
488            View child = dragLayer.getChildAt(i);
489            if (child instanceof Folder) {
490                Folder folder = (Folder) child;
491                if (folder.getInfo().opened)
492                    return folder;
493            }
494        }
495        return null;
496    }
497
498    boolean isTouchActive() {
499        return mTouchState != TOUCH_STATE_REST;
500    }
501
502    public long insertNewWorkspaceScreen(long screenId) {
503        return insertNewWorkspaceScreen(screenId, getChildCount(), true);
504    }
505
506    public long insertNewWorkspaceScreenBeforeEmptyScreen(long screenId, boolean updateDb) {
507        // Find the index to insert this view into.  If the empty screen exists, then
508        // insert it before that.
509        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
510        if (insertIndex < 0) {
511            insertIndex = mScreenOrder.size();
512        }
513        return insertNewWorkspaceScreen(screenId, insertIndex, updateDb);
514    }
515
516    public long insertNewWorkspaceScreen(long screenId, boolean updateDb) {
517        return insertNewWorkspaceScreen(screenId, getChildCount(), updateDb);
518    }
519
520    public long insertNewWorkspaceScreen(long screenId, int insertIndex, boolean updateDb) {
521        Log.d(TAG, "10249126 - insertNewWorkspaceScreen(" + screenId + ", " + insertIndex + ", " + updateDb + ")");
522        CellLayout newScreen = (CellLayout)
523                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
524
525        newScreen.setOnLongClickListener(mLongClickListener);
526        newScreen.setOnClickListener(mLauncher);
527        mWorkspaceScreens.put(screenId, newScreen);
528        mScreenOrder.add(insertIndex, screenId);
529        addView(newScreen, insertIndex);
530        if (updateDb) {
531            // On bind we don't need to update the screens in the database.
532            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
533        }
534        return screenId;
535    }
536
537    public void createCustomContentPage() {
538        Log.d(TAG, "10249126 - createCustomContentPage()");
539        CellLayout customScreen = (CellLayout)
540                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
541
542        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
543        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
544
545        // We want no padding on the custom content
546        customScreen.setPadding(0, 0, 0, 0);
547
548        addFullScreenPage(customScreen);
549
550        // Ensure that the current page and default page are maintained.
551        mDefaultPage++;
552        setCurrentPage(getCurrentPage() + 1);
553    }
554
555    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks) {
556        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
557            throw new RuntimeException("Expected custom content screen to exist");
558        }
559
560        // Add the custom content to the full screen custom page
561        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
562        int spanX = customScreen.getCountX();
563        int spanY = customScreen.getCountY();
564        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
565        lp.canReorder  = false;
566        lp.isFullscreen = true;
567        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
568
569        mCustomContentCallbacks = callbacks;
570    }
571
572    public long commitExtraEmptyScreen() {
573        Log.d(TAG, "10249126 - commitExtraEmptyScreen()");
574        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
575        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
576        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
577
578        long newId = LauncherAppState.getInstance().getLauncherProvider().generateNewScreenId();
579        mWorkspaceScreens.put(newId, cl);
580        mScreenOrder.add(newId);
581
582        addExtraEmptyScreen();
583
584        // Update the model for the new screen
585        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
586
587        return newId;
588    }
589
590    public void addExtraEmptyScreen() {
591        insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID, false);
592    }
593
594    public CellLayout getScreenWithId(long screenId) {
595        Log.d(TAG, "10249126 - getScreenWithId(" + screenId + ")");
596        CellLayout layout = mWorkspaceScreens.get(screenId);
597        return layout;
598    }
599
600    public long getIdForScreen(CellLayout layout) {
601        Log.d(TAG, "10249126 - getIdForScreen()");
602        Iterator<Long> iter = mWorkspaceScreens.keySet().iterator();
603        while (iter.hasNext()) {
604            long id = iter.next();
605            if (mWorkspaceScreens.get(id) == layout) {
606                return id;
607            }
608        }
609        return -1;
610    }
611
612    public int getPageIndexForScreenId(long screenId) {
613        Log.d(TAG, "10249126 - getPageIndexForScreenId(" + screenId + ")");
614        return indexOfChild(mWorkspaceScreens.get(screenId));
615    }
616
617    public long getScreenIdForPageIndex(int index) {
618        return mScreenOrder.get(index);
619    }
620
621    ArrayList<Long> getScreenOrder() {
622        return mScreenOrder;
623    }
624
625    public void stripEmptyScreens() {
626        if (isPageMoving()) {
627            mStripScreensOnPageStopMoving = true;
628            return;
629        }
630
631        Log.d(TAG, "10249126 - stripEmptyScreens()");
632
633        int currentPage = getNextPage();
634        ArrayList<Long> removeScreens = new ArrayList<Long>();
635        for (Long id: mWorkspaceScreens.keySet()) {
636            CellLayout cl = mWorkspaceScreens.get(id);
637            if (id >= 0 && cl.getShortcutsAndWidgets().getChildCount() == 0) {
638                removeScreens.add(id);
639            }
640        }
641
642        int pageShift = 0;
643        for (Long id: removeScreens) {
644            Log.d(TAG, "10249126 - \tremove(" + id + ")");
645            CellLayout cl = mWorkspaceScreens.get(id);
646            mWorkspaceScreens.remove(id);
647            mScreenOrder.remove(id);
648            if (indexOfChild(cl) < currentPage) {
649                pageShift++;
650            }
651            removeView(cl);
652        }
653
654        if (!removeScreens.isEmpty()) {
655            // Update the model if we have changed any screens
656            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
657        }
658
659        if (pageShift >= 0) {
660            setCurrentPage(currentPage - pageShift);
661        }
662    }
663
664    // See implementation for parameter definition.
665    void addInScreen(View child, long container, long screenId,
666            int x, int y, int spanX, int spanY) {
667        addInScreen(child, container, screenId, x, y, spanX, spanY, false, false);
668    }
669
670    // At bind time, we use the rank (screenId) to compute x and y for hotseat items.
671    // See implementation for parameter definition.
672    void addInScreenFromBind(View child, long container, long screenId, int x, int y,
673            int spanX, int spanY) {
674        addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);
675    }
676
677    // See implementation for parameter definition.
678    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
679            boolean insert) {
680        addInScreen(child, container, screenId, x, y, spanX, spanY, insert, false);
681    }
682
683    /**
684     * Adds the specified child in the specified screen. The position and dimension of
685     * the child are defined by x, y, spanX and spanY.
686     *
687     * @param child The child to add in one of the workspace's screens.
688     * @param screenId The screen in which to add the child.
689     * @param x The X position of the child in the screen's grid.
690     * @param y The Y position of the child in the screen's grid.
691     * @param spanX The number of cells spanned horizontally by the child.
692     * @param spanY The number of cells spanned vertically by the child.
693     * @param insert When true, the child is inserted at the beginning of the children list.
694     * @param computeXYFromRank When true, we use the rank (stored in screenId) to compute
695     *                          the x and y position in which to place hotseat items. Otherwise
696     *                          we use the x and y position to compute the rank.
697     */
698    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
699            boolean insert, boolean computeXYFromRank) {
700        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
701            if (getScreenWithId(screenId) == null) {
702                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
703                // DEBUGGING - Print out the stack trace to see where we are adding from
704                new Throwable().printStackTrace();
705                return;
706            }
707        }
708        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
709            // This should never happen
710            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
711        }
712
713        final CellLayout layout;
714        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
715            layout = mLauncher.getHotseat().getLayout();
716            child.setOnKeyListener(null);
717
718            // Hide folder title in the hotseat
719            if (child instanceof FolderIcon) {
720                ((FolderIcon) child).setTextVisible(false);
721            }
722
723            if (computeXYFromRank) {
724                x = mLauncher.getHotseat().getCellXFromOrder((int) screenId);
725                y = mLauncher.getHotseat().getCellYFromOrder((int) screenId);
726            } else {
727                screenId = mLauncher.getHotseat().getOrderInHotseat(x, y);
728            }
729        } else {
730            // Show folder title if not in the hotseat
731            if (child instanceof FolderIcon) {
732                ((FolderIcon) child).setTextVisible(true);
733            }
734            layout = getScreenWithId(screenId);
735            child.setOnKeyListener(new IconKeyEventListener());
736        }
737
738        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
739        CellLayout.LayoutParams lp;
740        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
741            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
742        } else {
743            lp = (CellLayout.LayoutParams) genericLp;
744            lp.cellX = x;
745            lp.cellY = y;
746            lp.cellHSpan = spanX;
747            lp.cellVSpan = spanY;
748        }
749
750        if (spanX < 0 && spanY < 0) {
751            lp.isLockedToGrid = false;
752        }
753
754        // Get the canonical child id to uniquely represent this view in this screen
755        int childId = LauncherModel.getCellLayoutChildId(container, screenId, x, y, spanX, spanY);
756        boolean markCellsAsOccupied = !(child instanceof Folder);
757        if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) {
758            // TODO: This branch occurs when the workspace is adding views
759            // outside of the defined grid
760            // maybe we should be deleting these items from the LauncherModel?
761            Log.w(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout");
762        }
763
764        if (!(child instanceof Folder)) {
765            child.setHapticFeedbackEnabled(false);
766            child.setOnLongClickListener(mLongClickListener);
767        }
768        if (child instanceof DropTarget) {
769            mDragController.addDropTarget((DropTarget) child);
770        }
771    }
772
773    /**
774     * Called directly from a CellLayout (not by the framework), after we've been added as a
775     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
776     * that it should intercept touch events, which is not something that is normally supported.
777     */
778    @Override
779    public boolean onTouch(View v, MotionEvent event) {
780        return (isSmall() || !isFinishedSwitchingState())
781                || (!isSmall() && indexOfChild(v) != mCurrentPage);
782    }
783
784    public boolean isSwitchingState() {
785        return mIsSwitchingState;
786    }
787
788    /** This differs from isSwitchingState in that we take into account how far the transition
789     *  has completed. */
790    public boolean isFinishedSwitchingState() {
791        return !mIsSwitchingState || (mTransitionProgress > 0.5f);
792    }
793
794    protected void onWindowVisibilityChanged (int visibility) {
795        mLauncher.onWindowVisibilityChanged(visibility);
796        if (mCustomContentShowing && mCustomContentCallbacks != null) {
797            if (visibility == View.VISIBLE) {
798                mCustomContentCallbacks.onShow();
799            } else if (visibility == View.GONE) {
800                mCustomContentCallbacks.onHide();
801            }
802        }
803    }
804
805    @Override
806    public boolean dispatchUnhandledMove(View focused, int direction) {
807        if (isSmall() || !isFinishedSwitchingState()) {
808            // when the home screens are shrunken, shouldn't allow side-scrolling
809            return false;
810        }
811        return super.dispatchUnhandledMove(focused, direction);
812    }
813
814    @Override
815    public boolean onInterceptTouchEvent(MotionEvent ev) {
816        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
817        case MotionEvent.ACTION_DOWN:
818            mXDown = ev.getX();
819            mYDown = ev.getY();
820            mTouchDownTime = System.currentTimeMillis();
821            break;
822        case MotionEvent.ACTION_POINTER_UP:
823        case MotionEvent.ACTION_UP:
824            if (mTouchState == TOUCH_STATE_REST) {
825                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
826                if (!currentPage.lastDownOnOccupiedCell()) {
827                    onWallpaperTap(ev);
828                }
829            }
830        }
831        return super.onInterceptTouchEvent(ev);
832    }
833
834    protected void reinflateWidgetsIfNecessary() {
835        final int clCount = getChildCount();
836        for (int i = 0; i < clCount; i++) {
837            CellLayout cl = (CellLayout) getChildAt(i);
838            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
839            final int itemCount = swc.getChildCount();
840            for (int j = 0; j < itemCount; j++) {
841                View v = swc.getChildAt(j);
842
843                if (v.getTag() instanceof LauncherAppWidgetInfo) {
844                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
845                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) info.hostView;
846                    if (lahv != null && lahv.orientationChangedSincedInflation()) {
847                        mLauncher.removeAppWidget(info);
848                        // Remove the current widget which is inflated with the wrong orientation
849                        cl.removeView(lahv);
850                        mLauncher.bindAppWidget(info);
851                    }
852                }
853            }
854        }
855    }
856
857    @Override
858    protected void determineScrollingStart(MotionEvent ev) {
859        if (!isFinishedSwitchingState()) return;
860
861        float deltaX = ev.getX() - mXDown;
862        float absDeltaX = Math.abs(deltaX);
863        float absDeltaY = Math.abs(ev.getY() - mYDown);
864
865        if (Float.compare(absDeltaX, 0f) == 0) return;
866
867        float slope = absDeltaY / absDeltaX;
868        float theta = (float) Math.atan(slope);
869
870        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
871            cancelCurrentPageLongPress();
872        }
873
874        boolean passRightSwipesToCustomContent =
875                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
876
877        if (deltaX > 0 && getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID
878                && passRightSwipesToCustomContent) {
879            // Pass swipes to the right to the custom content page.
880            return;
881        }
882
883        if (theta > MAX_SWIPE_ANGLE) {
884            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
885            return;
886        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
887            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
888            // increase the touch slop to make it harder to begin scrolling the workspace. This
889            // results in vertically scrolling widgets to more easily. The higher the angle, the
890            // more we increase touch slop.
891            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
892            float extraRatio = (float)
893                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
894            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
895        } else {
896            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
897            super.determineScrollingStart(ev);
898        }
899    }
900
901    protected void onPageBeginMoving() {
902        super.onPageBeginMoving();
903
904        if (isHardwareAccelerated()) {
905            updateChildrenLayersEnabled(false);
906        } else {
907            if (mNextPage != INVALID_PAGE) {
908                // we're snapping to a particular screen
909                enableChildrenCache(mCurrentPage, mNextPage);
910            } else {
911                // this is when user is actively dragging a particular screen, they might
912                // swipe it either left or right (but we won't advance by more than one screen)
913                enableChildrenCache(mCurrentPage - 1, mCurrentPage + 1);
914            }
915        }
916
917        // Only show page outlines as we pan if we are on large screen
918        if (LauncherAppState.getInstance().isScreenLarge()) {
919            showOutlines();
920            mIsStaticWallpaper = mWallpaperManager.getWallpaperInfo() == null;
921        }
922
923        // If we are not fading in adjacent screens, we still need to restore the alpha in case the
924        // user scrolls while we are transitioning (should not affect dispatchDraw optimizations)
925        if (!mWorkspaceFadeInAdjacentScreens) {
926            for (int i = 0; i < getChildCount(); ++i) {
927                ((CellLayout) getPageAt(i)).setShortcutAndWidgetAlpha(1f);
928            }
929        }
930    }
931
932    protected void onPageEndMoving() {
933        super.onPageEndMoving();
934
935        if (isHardwareAccelerated()) {
936            updateChildrenLayersEnabled(false);
937        } else {
938            clearChildrenCache();
939        }
940
941
942        if (mDragController.isDragging()) {
943            if (isSmall()) {
944                // If we are in springloaded mode, then force an event to check if the current touch
945                // is under a new page (to scroll to)
946                mDragController.forceTouchMove();
947            }
948        } else {
949            // If we are not mid-dragging, hide the page outlines if we are on a large screen
950            if (LauncherAppState.getInstance().isScreenLarge()) {
951                hideOutlines();
952            }
953        }
954
955        if (mDelayedResizeRunnable != null) {
956            mDelayedResizeRunnable.run();
957            mDelayedResizeRunnable = null;
958        }
959
960        if (mDelayedSnapToPageRunnable != null) {
961            mDelayedSnapToPageRunnable.run();
962            mDelayedSnapToPageRunnable = null;
963        }
964        if (mStripScreensOnPageStopMoving) {
965            stripEmptyScreens();
966            mStripScreensOnPageStopMoving = false;
967        }
968
969        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
970            mCustomContentShowing = true;
971            if (mCustomContentCallbacks != null) {
972                mCustomContentCallbacks.onShow();
973                mCustomContentShowTime = System.currentTimeMillis();
974            }
975        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
976            mCustomContentShowing = false;
977            if (mCustomContentCallbacks != null) {
978                mCustomContentCallbacks.onHide();
979                mLauncher.resetQSBScroll();
980            }
981        }
982    }
983
984    @Override
985    protected void notifyPageSwitchListener() {
986        super.notifyPageSwitchListener();
987        Launcher.setScreen(mCurrentPage);
988    };
989
990    // As a ratio of screen height, the total distance we want the parallax effect to span
991    // horizontally
992    private float wallpaperTravelToScreenWidthRatio(int width, int height) {
993        float aspectRatio = width / (float) height;
994
995        // At an aspect ratio of 16/10, the wallpaper parallax effect should span 1.5 * screen width
996        // At an aspect ratio of 10/16, the wallpaper parallax effect should span 1.2 * screen width
997        // We will use these two data points to extrapolate how much the wallpaper parallax effect
998        // to span (ie travel) at any aspect ratio:
999
1000        final float ASPECT_RATIO_LANDSCAPE = 16/10f;
1001        final float ASPECT_RATIO_PORTRAIT = 10/16f;
1002        final float WALLPAPER_WIDTH_TO_SCREEN_RATIO_LANDSCAPE = 1.5f;
1003        final float WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT = 1.2f;
1004
1005        // To find out the desired width at different aspect ratios, we use the following two
1006        // formulas, where the coefficient on x is the aspect ratio (width/height):
1007        //   (16/10)x + y = 1.5
1008        //   (10/16)x + y = 1.2
1009        // We solve for x and y and end up with a final formula:
1010        final float x =
1011            (WALLPAPER_WIDTH_TO_SCREEN_RATIO_LANDSCAPE - WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT) /
1012            (ASPECT_RATIO_LANDSCAPE - ASPECT_RATIO_PORTRAIT);
1013        final float y = WALLPAPER_WIDTH_TO_SCREEN_RATIO_PORTRAIT - x * ASPECT_RATIO_PORTRAIT;
1014        return x * aspectRatio + y;
1015    }
1016
1017    protected void setWallpaperDimension() {
1018        Point minDims = new Point();
1019        Point maxDims = new Point();
1020        mLauncher.getWindowManager().getDefaultDisplay().getCurrentSizeRange(minDims, maxDims);
1021
1022        final int maxDim = Math.max(maxDims.x, maxDims.y);
1023        final int minDim = Math.min(minDims.x, minDims.y);
1024
1025        // We need to ensure that there is enough extra space in the wallpaper for the intended
1026        // parallax effects
1027        if (LauncherAppState.getInstance().isScreenLarge()) {
1028            mWallpaperWidth = (int) (maxDim * wallpaperTravelToScreenWidthRatio(maxDim, minDim));
1029            mWallpaperHeight = maxDim;
1030        } else {
1031            mWallpaperWidth = Math.max((int) (minDim * WALLPAPER_SCREENS_SPAN), maxDim);
1032            mWallpaperHeight = maxDim;
1033        }
1034        new Thread("setWallpaperDimension") {
1035            public void run() {
1036                mWallpaperManager.suggestDesiredDimensions(mWallpaperWidth, mWallpaperHeight);
1037            }
1038        }.start();
1039    }
1040
1041    private void syncWallpaperOffsetWithScroll() {
1042        final boolean enableWallpaperEffects = isHardwareAccelerated();
1043        if (enableWallpaperEffects) {
1044            // TODO: figure out what to do about parallax, for now disable it
1045            //mWallpaperOffset.setFinalX(wallpaperOffsetForCurrentScroll());
1046        }
1047    }
1048
1049    public void updateWallpaperOffsetImmediately() {
1050        mUpdateWallpaperOffsetImmediately = true;
1051    }
1052
1053    private void updateWallpaperOffsets() {
1054        boolean updateNow = false;
1055        boolean keepUpdating = true;
1056        if (mUpdateWallpaperOffsetImmediately) {
1057            updateNow = true;
1058            keepUpdating = false;
1059            mWallpaperOffset.jumpToFinal();
1060            mUpdateWallpaperOffsetImmediately = false;
1061        } else {
1062            updateNow = keepUpdating = mWallpaperOffset.computeScrollOffset();
1063        }
1064        if (updateNow) {
1065            if (mWindowToken != null) {
1066                mWallpaperManager.setWallpaperOffsets(mWindowToken,
1067                        mWallpaperOffset.getCurrX(), mWallpaperOffset.getCurrY());
1068            }
1069        }
1070        if (keepUpdating) {
1071            invalidate();
1072        }
1073    }
1074
1075    protected void snapToPage(int whichPage, Runnable r) {
1076        if (mDelayedSnapToPageRunnable != null) {
1077            mDelayedSnapToPageRunnable.run();
1078        }
1079        mDelayedSnapToPageRunnable = r;
1080        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION);
1081    }
1082
1083    protected void snapToScreenId(long screenId, Runnable r) {
1084        snapToPage(getPageIndexForScreenId(screenId), r);
1085    }
1086
1087    class WallpaperOffsetInterpolator {
1088        float mFinalHorizontalWallpaperOffset = 0.0f;
1089        float mFinalVerticalWallpaperOffset = 0.5f;
1090        float mHorizontalWallpaperOffset = 0.0f;
1091        float mVerticalWallpaperOffset = 0.5f;
1092        long mLastWallpaperOffsetUpdateTime;
1093        boolean mIsMovingFast;
1094        boolean mOverrideHorizontalCatchupConstant;
1095        float mHorizontalCatchupConstant = 0.35f;
1096        float mVerticalCatchupConstant = 0.35f;
1097
1098        public WallpaperOffsetInterpolator() {
1099        }
1100
1101        public void setOverrideHorizontalCatchupConstant(boolean override) {
1102            mOverrideHorizontalCatchupConstant = override;
1103        }
1104
1105        public void setHorizontalCatchupConstant(float f) {
1106            mHorizontalCatchupConstant = f;
1107        }
1108
1109        public void setVerticalCatchupConstant(float f) {
1110            mVerticalCatchupConstant = f;
1111        }
1112
1113        public boolean computeScrollOffset() {
1114            if (Float.compare(mHorizontalWallpaperOffset, mFinalHorizontalWallpaperOffset) == 0 &&
1115                    Float.compare(mVerticalWallpaperOffset, mFinalVerticalWallpaperOffset) == 0) {
1116                mIsMovingFast = false;
1117                return false;
1118            }
1119            boolean isLandscape = mDisplaySize.x > mDisplaySize.y;
1120
1121            long currentTime = System.currentTimeMillis();
1122            long timeSinceLastUpdate = currentTime - mLastWallpaperOffsetUpdateTime;
1123            timeSinceLastUpdate = Math.min((long) (1000/30f), timeSinceLastUpdate);
1124            timeSinceLastUpdate = Math.max(1L, timeSinceLastUpdate);
1125
1126            float xdiff = Math.abs(mFinalHorizontalWallpaperOffset - mHorizontalWallpaperOffset);
1127            if (!mIsMovingFast && xdiff > 0.07) {
1128                mIsMovingFast = true;
1129            }
1130
1131            float fractionToCatchUpIn1MsHorizontal;
1132            if (mOverrideHorizontalCatchupConstant) {
1133                fractionToCatchUpIn1MsHorizontal = mHorizontalCatchupConstant;
1134            } else if (mIsMovingFast) {
1135                fractionToCatchUpIn1MsHorizontal = isLandscape ? 0.5f : 0.75f;
1136            } else {
1137                // slow
1138                fractionToCatchUpIn1MsHorizontal = isLandscape ? 0.27f : 0.5f;
1139            }
1140            float fractionToCatchUpIn1MsVertical = mVerticalCatchupConstant;
1141
1142            fractionToCatchUpIn1MsHorizontal /= 33f;
1143            fractionToCatchUpIn1MsVertical /= 33f;
1144
1145            final float UPDATE_THRESHOLD = 0.00001f;
1146            float hOffsetDelta = mFinalHorizontalWallpaperOffset - mHorizontalWallpaperOffset;
1147            float vOffsetDelta = mFinalVerticalWallpaperOffset - mVerticalWallpaperOffset;
1148            boolean jumpToFinalValue = Math.abs(hOffsetDelta) < UPDATE_THRESHOLD &&
1149                Math.abs(vOffsetDelta) < UPDATE_THRESHOLD;
1150
1151            // Don't have any lag between workspace and wallpaper on non-large devices
1152            if (!LauncherAppState.getInstance().isScreenLarge() || jumpToFinalValue) {
1153                mHorizontalWallpaperOffset = mFinalHorizontalWallpaperOffset;
1154                mVerticalWallpaperOffset = mFinalVerticalWallpaperOffset;
1155            } else {
1156                float percentToCatchUpVertical =
1157                    Math.min(1.0f, timeSinceLastUpdate * fractionToCatchUpIn1MsVertical);
1158                float percentToCatchUpHorizontal =
1159                    Math.min(1.0f, timeSinceLastUpdate * fractionToCatchUpIn1MsHorizontal);
1160                mHorizontalWallpaperOffset += percentToCatchUpHorizontal * hOffsetDelta;
1161                mVerticalWallpaperOffset += percentToCatchUpVertical * vOffsetDelta;
1162            }
1163
1164            mLastWallpaperOffsetUpdateTime = System.currentTimeMillis();
1165            return true;
1166        }
1167
1168        public float getCurrX() {
1169            return mHorizontalWallpaperOffset;
1170        }
1171
1172        public float getFinalX() {
1173            return mFinalHorizontalWallpaperOffset;
1174        }
1175
1176        public float getCurrY() {
1177            return mVerticalWallpaperOffset;
1178        }
1179
1180        public float getFinalY() {
1181            return mFinalVerticalWallpaperOffset;
1182        }
1183
1184        public void setFinalX(float x) {
1185            mFinalHorizontalWallpaperOffset = Math.max(0f, Math.min(x, 1.0f));
1186        }
1187
1188        public void setFinalY(float y) {
1189            mFinalVerticalWallpaperOffset = Math.max(0f, Math.min(y, 1.0f));
1190        }
1191
1192        public void jumpToFinal() {
1193            mHorizontalWallpaperOffset = mFinalHorizontalWallpaperOffset;
1194            mVerticalWallpaperOffset = mFinalVerticalWallpaperOffset;
1195        }
1196    }
1197
1198    @Override
1199    public void computeScroll() {
1200        super.computeScroll();
1201        syncWallpaperOffsetWithScroll();
1202    }
1203
1204    void showOutlines() {
1205        if (!isSmall() && !mIsSwitchingState) {
1206            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1207            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1208            mChildrenOutlineFadeInAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 1.0f);
1209            mChildrenOutlineFadeInAnimation.setDuration(CHILDREN_OUTLINE_FADE_IN_DURATION);
1210            mChildrenOutlineFadeInAnimation.start();
1211        }
1212    }
1213
1214    void hideOutlines() {
1215        if (!isSmall() && !mIsSwitchingState) {
1216            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1217            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1218            mChildrenOutlineFadeOutAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 0.0f);
1219            mChildrenOutlineFadeOutAnimation.setDuration(CHILDREN_OUTLINE_FADE_OUT_DURATION);
1220            mChildrenOutlineFadeOutAnimation.setStartDelay(CHILDREN_OUTLINE_FADE_OUT_DELAY);
1221            mChildrenOutlineFadeOutAnimation.start();
1222        }
1223    }
1224
1225    public void showOutlinesTemporarily() {
1226        if (!mIsPageMoving && !isTouchActive()) {
1227            snapToPage(mCurrentPage);
1228        }
1229    }
1230
1231    public void setChildrenOutlineAlpha(float alpha) {
1232        mChildrenOutlineAlpha = alpha;
1233        for (int i = 0; i < getChildCount(); i++) {
1234            CellLayout cl = (CellLayout) getChildAt(i);
1235            cl.setBackgroundAlpha(alpha);
1236        }
1237    }
1238
1239    public float getChildrenOutlineAlpha() {
1240        return mChildrenOutlineAlpha;
1241    }
1242
1243    void disableBackground() {
1244        mDrawBackground = false;
1245    }
1246    void enableBackground() {
1247        mDrawBackground = true;
1248    }
1249
1250    private void animateBackgroundGradient(float finalAlpha, boolean animated) {
1251        if (mBackground == null) return;
1252        if (mBackgroundFadeInAnimation != null) {
1253            mBackgroundFadeInAnimation.cancel();
1254            mBackgroundFadeInAnimation = null;
1255        }
1256        if (mBackgroundFadeOutAnimation != null) {
1257            mBackgroundFadeOutAnimation.cancel();
1258            mBackgroundFadeOutAnimation = null;
1259        }
1260        float startAlpha = getBackgroundAlpha();
1261        if (finalAlpha != startAlpha) {
1262            if (animated) {
1263                mBackgroundFadeOutAnimation =
1264                        LauncherAnimUtils.ofFloat(this, startAlpha, finalAlpha);
1265                mBackgroundFadeOutAnimation.addUpdateListener(new AnimatorUpdateListener() {
1266                    public void onAnimationUpdate(ValueAnimator animation) {
1267                        setBackgroundAlpha(((Float) animation.getAnimatedValue()).floatValue());
1268                    }
1269                });
1270                mBackgroundFadeOutAnimation.setInterpolator(new DecelerateInterpolator(1.5f));
1271                mBackgroundFadeOutAnimation.setDuration(BACKGROUND_FADE_OUT_DURATION);
1272                mBackgroundFadeOutAnimation.start();
1273            } else {
1274                setBackgroundAlpha(finalAlpha);
1275            }
1276        }
1277    }
1278
1279    public void setBackgroundAlpha(float alpha) {
1280        if (alpha != mBackgroundAlpha) {
1281            mBackgroundAlpha = alpha;
1282            invalidate();
1283        }
1284    }
1285
1286    public float getBackgroundAlpha() {
1287        return mBackgroundAlpha;
1288    }
1289
1290    float backgroundAlphaInterpolator(float r) {
1291        float pivotA = 0.1f;
1292        float pivotB = 0.4f;
1293        if (r < pivotA) {
1294            return 0;
1295        } else if (r > pivotB) {
1296            return 1.0f;
1297        } else {
1298            return (r - pivotA)/(pivotB - pivotA);
1299        }
1300    }
1301
1302    private void updatePageAlphaValues(int screenCenter) {
1303        boolean isInOverscroll = mOverScrollX < 0 || mOverScrollX > mMaxScrollX;
1304        if (mWorkspaceFadeInAdjacentScreens &&
1305                mState == State.NORMAL &&
1306                !mIsSwitchingState &&
1307                !isInOverscroll) {
1308            for (int i = 0; i < getChildCount(); i++) {
1309                CellLayout child = (CellLayout) getChildAt(i);
1310                if (child != null) {
1311                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1312                    float alpha = 1 - Math.abs(scrollProgress);
1313                    child.getShortcutsAndWidgets().setAlpha(alpha);
1314                    if (!mIsDragOccuring) {
1315                        child.setBackgroundAlphaMultiplier(
1316                                backgroundAlphaInterpolator(Math.abs(scrollProgress)));
1317                    } else {
1318                        child.setBackgroundAlphaMultiplier(1f);
1319                    }
1320                }
1321            }
1322        }
1323    }
1324
1325    private void setChildrenBackgroundAlphaMultipliers(float a) {
1326        for (int i = 0; i < getChildCount(); i++) {
1327            CellLayout child = (CellLayout) getChildAt(i);
1328            child.setBackgroundAlphaMultiplier(a);
1329        }
1330    }
1331
1332    public boolean hasCustomContent() {
1333        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1334    }
1335
1336    public boolean isOnOrMovingToCustomContent() {
1337        return hasCustomContent() && getNextPage() == 0;
1338    }
1339
1340    private void updateStateForCustomContent(int screenCenter) {
1341        if (hasCustomContent() && !isSmall() && !isSwitchingState()) {
1342            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1343            int scrollDelta = getScrollForPage(index + 1) - getScrollX();
1344            float progress = (1.0f * scrollDelta) /
1345                    (getScrollForPage(index + 1) - getScrollForPage(index));
1346            progress = Math.max(0, progress);
1347
1348            setBackgroundAlpha(progress * 0.8f);
1349            float height = getViewportHeight();
1350            if (getPageIndicator() != null) {
1351                height -= getPageIndicator().getTop();
1352            } else if (mLauncher.getHotseat() != null) {
1353                height -= mLauncher.getHotseat().getTop();
1354            }
1355            float transY = progress * height;
1356
1357            if (mLauncher.getHotseat() != null) {
1358                mLauncher.getHotseat().setTranslationY(transY);
1359                mLauncher.getHotseat().setAlpha(1 - progress);
1360            }
1361            if (getPageIndicator() != null) {
1362                final float alpha = 1 - progress;
1363                final View pi = getPageIndicator();
1364                getPageIndicator().setAlpha(alpha);
1365                if (alpha < ALPHA_CUTOFF_THRESHOLD && pi.getVisibility() != INVISIBLE) {
1366                    pi.setVisibility(INVISIBLE);
1367                } else if (alpha > ALPHA_CUTOFF_THRESHOLD && pi.getVisibility() != VISIBLE) {
1368                    pi.setVisibility(VISIBLE);
1369                }
1370            }
1371        }
1372    }
1373
1374    @Override
1375    protected void screenScrolled(int screenCenter) {
1376        final boolean isRtl = isLayoutRtl();
1377        super.screenScrolled(screenCenter);
1378
1379        updatePageAlphaValues(screenCenter);
1380        updateStateForCustomContent(screenCenter);
1381        enableHwLayersOnVisiblePages();
1382
1383        if ((mOverScrollX < 0 && !hasCustomContent()) || mOverScrollX > mMaxScrollX) {
1384            int index = 0;
1385            float pivotX = 0f;
1386            final float leftBiasedPivot = 0.25f;
1387            final float rightBiasedPivot = 0.75f;
1388            final int lowerIndex = 0;
1389            final int upperIndex = getChildCount() - 1;
1390            if (isRtl) {
1391                index = mOverScrollX < 0 ? upperIndex : lowerIndex;
1392                pivotX = (index == 0 ? leftBiasedPivot : rightBiasedPivot);
1393            } else {
1394                index = mOverScrollX < 0 ? lowerIndex : upperIndex;
1395                pivotX = (index == 0 ? rightBiasedPivot : leftBiasedPivot);
1396            }
1397
1398            CellLayout cl = (CellLayout) getChildAt(index);
1399            float scrollProgress = getScrollProgress(screenCenter, cl, index);
1400            final boolean isLeftPage = (isRtl ? index > 0 : index == 0);
1401            cl.setOverScrollAmount(Math.abs(scrollProgress), isLeftPage);
1402            float rotation = -WORKSPACE_OVERSCROLL_ROTATION * scrollProgress;
1403            cl.setRotationY(rotation);
1404            setFadeForOverScroll(Math.abs(scrollProgress));
1405            if (!mOverscrollTransformsSet) {
1406                mOverscrollTransformsSet = true;
1407                cl.setCameraDistance(mDensity * mCameraDistance);
1408                cl.setPivotX(cl.getMeasuredWidth() * pivotX);
1409                cl.setPivotY(cl.getMeasuredHeight() * 0.5f);
1410                cl.setOverscrollTransformsDirty(true);
1411            }
1412        } else {
1413            if (mOverscrollFade != 0) {
1414                setFadeForOverScroll(0);
1415            }
1416            if (mOverscrollTransformsSet) {
1417                mOverscrollTransformsSet = false;
1418                ((CellLayout) getChildAt(0)).resetOverscrollTransforms();
1419                ((CellLayout) getChildAt(getChildCount() - 1)).resetOverscrollTransforms();
1420            }
1421        }
1422    }
1423
1424    @Override
1425    protected void overScroll(float amount) {
1426        acceleratedOverScroll(amount);
1427    }
1428
1429    protected void onAttachedToWindow() {
1430        super.onAttachedToWindow();
1431        mWindowToken = getWindowToken();
1432        computeScroll();
1433        mDragController.setWindowToken(mWindowToken);
1434    }
1435
1436    protected void onDetachedFromWindow() {
1437        super.onDetachedFromWindow();
1438        mWindowToken = null;
1439    }
1440
1441    @Override
1442    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1443        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1444            mUpdateWallpaperOffsetImmediately = true;
1445        }
1446        super.onLayout(changed, left, top, right, bottom);
1447    }
1448
1449    @Override
1450    protected void onDraw(Canvas canvas) {
1451        updateWallpaperOffsets();
1452
1453        // Draw the background gradient if necessary
1454        if (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground) {
1455            int alpha = (int) (mBackgroundAlpha * 255);
1456            mBackground.setAlpha(alpha);
1457            mBackground.setBounds(getScrollX(), 0, getScrollX() + getMeasuredWidth(),
1458                    getMeasuredHeight());
1459            mBackground.draw(canvas);
1460        }
1461
1462        super.onDraw(canvas);
1463
1464        // Call back to LauncherModel to finish binding after the first draw
1465        post(mBindPages);
1466    }
1467
1468    boolean isDrawingBackgroundGradient() {
1469        return (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground);
1470    }
1471
1472    @Override
1473    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
1474        if (!mLauncher.isAllAppsVisible()) {
1475            final Folder openFolder = getOpenFolder();
1476            if (openFolder != null) {
1477                return openFolder.requestFocus(direction, previouslyFocusedRect);
1478            } else {
1479                return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
1480            }
1481        }
1482        return false;
1483    }
1484
1485    @Override
1486    public int getDescendantFocusability() {
1487        if (isSmall()) {
1488            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1489        }
1490        return super.getDescendantFocusability();
1491    }
1492
1493    @Override
1494    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
1495        if (!mLauncher.isAllAppsVisible()) {
1496            final Folder openFolder = getOpenFolder();
1497            if (openFolder != null) {
1498                openFolder.addFocusables(views, direction);
1499            } else {
1500                super.addFocusables(views, direction, focusableMode);
1501            }
1502        }
1503    }
1504
1505    public boolean isSmall() {
1506        return mState == State.SMALL || mState == State.SPRING_LOADED || mState == State.OVERVIEW;
1507    }
1508
1509    void enableChildrenCache(int fromPage, int toPage) {
1510        if (fromPage > toPage) {
1511            final int temp = fromPage;
1512            fromPage = toPage;
1513            toPage = temp;
1514        }
1515
1516        final int screenCount = getChildCount();
1517
1518        fromPage = Math.max(fromPage, 0);
1519        toPage = Math.min(toPage, screenCount - 1);
1520
1521        for (int i = fromPage; i <= toPage; i++) {
1522            final CellLayout layout = (CellLayout) getChildAt(i);
1523            layout.setChildrenDrawnWithCacheEnabled(true);
1524            layout.setChildrenDrawingCacheEnabled(true);
1525        }
1526    }
1527
1528    void clearChildrenCache() {
1529        final int screenCount = getChildCount();
1530        for (int i = 0; i < screenCount; i++) {
1531            final CellLayout layout = (CellLayout) getChildAt(i);
1532            layout.setChildrenDrawnWithCacheEnabled(false);
1533            // In software mode, we don't want the items to continue to be drawn into bitmaps
1534            if (!isHardwareAccelerated()) {
1535                layout.setChildrenDrawingCacheEnabled(false);
1536            }
1537        }
1538    }
1539
1540    private void updateChildrenLayersEnabled(boolean force) {
1541        boolean small = mState == State.SMALL || mState == State.OVERVIEW || mIsSwitchingState;
1542        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageMoving();
1543
1544        if (enableChildrenLayers != mChildrenLayersEnabled) {
1545            mChildrenLayersEnabled = enableChildrenLayers;
1546            if (mChildrenLayersEnabled) {
1547                enableHwLayersOnVisiblePages();
1548            } else {
1549                for (int i = 0; i < getPageCount(); i++) {
1550                    final CellLayout cl = (CellLayout) getChildAt(i);
1551                    cl.disableHardwareLayers();
1552                }
1553            }
1554        }
1555    }
1556
1557    private void enableHwLayersOnVisiblePages() {
1558        if (mChildrenLayersEnabled) {
1559            final int screenCount = getChildCount();
1560            getVisiblePages(mTempVisiblePagesRange);
1561            int leftScreen = mTempVisiblePagesRange[0];
1562            int rightScreen = mTempVisiblePagesRange[1];
1563            if (leftScreen == rightScreen) {
1564                // make sure we're caching at least two pages always
1565                if (rightScreen < screenCount - 1) {
1566                    rightScreen++;
1567                } else if (leftScreen > 0) {
1568                    leftScreen--;
1569                }
1570            }
1571            for (int i = 0; i < screenCount; i++) {
1572                final CellLayout layout = (CellLayout) getPageAt(i);
1573                if (!(leftScreen <= i && i <= rightScreen && shouldDrawChild(layout))) {
1574                    layout.disableHardwareLayers();
1575                }
1576            }
1577            for (int i = 0; i < screenCount; i++) {
1578                final CellLayout layout = (CellLayout) getPageAt(i);
1579                if (leftScreen <= i && i <= rightScreen && shouldDrawChild(layout)) {
1580                    layout.enableHardwareLayers();
1581                }
1582            }
1583        }
1584    }
1585
1586    public void buildPageHardwareLayers() {
1587        // force layers to be enabled just for the call to buildLayer
1588        updateChildrenLayersEnabled(true);
1589        if (getWindowToken() != null) {
1590            final int childCount = getChildCount();
1591            for (int i = 0; i < childCount; i++) {
1592                CellLayout cl = (CellLayout) getChildAt(i);
1593                cl.buildHardwareLayer();
1594            }
1595        }
1596        updateChildrenLayersEnabled(false);
1597    }
1598
1599    protected void onWallpaperTap(MotionEvent ev) {
1600        final int[] position = mTempCell;
1601        getLocationOnScreen(position);
1602
1603        int pointerIndex = ev.getActionIndex();
1604        position[0] += (int) ev.getX(pointerIndex);
1605        position[1] += (int) ev.getY(pointerIndex);
1606
1607        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1608                ev.getAction() == MotionEvent.ACTION_UP
1609                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1610                position[0], position[1], 0, null);
1611    }
1612
1613    /*
1614     * This interpolator emulates the rate at which the perceived scale of an object changes
1615     * as its distance from a camera increases. When this interpolator is applied to a scale
1616     * animation on a view, it evokes the sense that the object is shrinking due to moving away
1617     * from the camera.
1618     */
1619    static class ZInterpolator implements TimeInterpolator {
1620        private float focalLength;
1621
1622        public ZInterpolator(float foc) {
1623            focalLength = foc;
1624        }
1625
1626        public float getInterpolation(float input) {
1627            return (1.0f - focalLength / (focalLength + input)) /
1628                (1.0f - focalLength / (focalLength + 1.0f));
1629        }
1630    }
1631
1632    /*
1633     * The exact reverse of ZInterpolator.
1634     */
1635    static class InverseZInterpolator implements TimeInterpolator {
1636        private ZInterpolator zInterpolator;
1637        public InverseZInterpolator(float foc) {
1638            zInterpolator = new ZInterpolator(foc);
1639        }
1640        public float getInterpolation(float input) {
1641            return 1 - zInterpolator.getInterpolation(1 - input);
1642        }
1643    }
1644
1645    /*
1646     * ZInterpolator compounded with an ease-out.
1647     */
1648    static class ZoomOutInterpolator implements TimeInterpolator {
1649        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(0.75f);
1650        private final ZInterpolator zInterpolator = new ZInterpolator(0.13f);
1651
1652        public float getInterpolation(float input) {
1653            return decelerate.getInterpolation(zInterpolator.getInterpolation(input));
1654        }
1655    }
1656
1657    /*
1658     * InvereZInterpolator compounded with an ease-out.
1659     */
1660    static class ZoomInInterpolator implements TimeInterpolator {
1661        private final InverseZInterpolator inverseZInterpolator = new InverseZInterpolator(0.35f);
1662        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(3.0f);
1663
1664        public float getInterpolation(float input) {
1665            return decelerate.getInterpolation(inverseZInterpolator.getInterpolation(input));
1666        }
1667    }
1668
1669    private final ZoomInInterpolator mZoomInInterpolator = new ZoomInInterpolator();
1670
1671    /*
1672    *
1673    * We call these methods (onDragStartedWithItemSpans/onDragStartedWithSize) whenever we
1674    * start a drag in Launcher, regardless of whether the drag has ever entered the Workspace
1675    *
1676    * These methods mark the appropriate pages as accepting drops (which alters their visual
1677    * appearance).
1678    *
1679    */
1680    public void onDragStartedWithItem(View v) {
1681        final Canvas canvas = new Canvas();
1682
1683        // The outline is used to visualize where the item will land if dropped
1684        mDragOutline = createDragOutline(v, canvas, DRAG_BITMAP_PADDING);
1685    }
1686
1687    public void onDragStartedWithItem(PendingAddItemInfo info, Bitmap b, boolean clipAlpha) {
1688        final Canvas canvas = new Canvas();
1689
1690        int[] size = estimateItemSize(info.spanX, info.spanY, info, false);
1691
1692        // The outline is used to visualize where the item will land if dropped
1693        mDragOutline = createDragOutline(b, canvas, DRAG_BITMAP_PADDING, size[0],
1694                size[1], clipAlpha);
1695    }
1696
1697    public void exitWidgetResizeMode() {
1698        DragLayer dragLayer = mLauncher.getDragLayer();
1699        dragLayer.clearAllResizeFrames();
1700    }
1701
1702    private void initAnimationArrays() {
1703        final int childCount = getChildCount();
1704        if (mLastChildCount == childCount) return;
1705
1706        mOldBackgroundAlphas = new float[childCount];
1707        mOldAlphas = new float[childCount];
1708        mNewBackgroundAlphas = new float[childCount];
1709        mNewAlphas = new float[childCount];
1710    }
1711
1712    Animator getChangeStateAnimation(final State state, boolean animated) {
1713        return getChangeStateAnimation(state, animated, 0, -1);
1714    }
1715
1716    @Override
1717    protected void getOverviewModePages(int[] range) {
1718        int count = mScreenOrder.size();
1719
1720        int start = -1;
1721        int end = -1;
1722        //
1723        for (int i = 0; i < count; i++) {
1724            if (start < 0 && mScreenOrder.get(i) >= 0) {
1725                start = i;
1726            }
1727            if (start >=0 && mScreenOrder.get(i) >= 0) {
1728                end = i;
1729            }
1730        }
1731        range[0] = start;
1732        range[1] = end;
1733     }
1734
1735    protected void onStartReordering() {
1736        super.onStartReordering();
1737        int count = getChildCount();
1738        for (int i = 0; i < count; i++) {
1739            ((CellLayout) getChildAt(i)).setUseActiveGlowBackground(true);
1740        }
1741        showOutlines();
1742
1743        // Reordering handles its own animations, disable the automatic ones.
1744        setLayoutTransition(null);
1745    }
1746
1747    protected void onEndReordering() {
1748        super.onEndReordering();
1749        int count = getChildCount();
1750        for (int i = 0; i < count; i++) {
1751            ((CellLayout) getChildAt(i)).setUseActiveGlowBackground(false);
1752        }
1753        hideOutlines();
1754
1755        mScreenOrder.clear();
1756        for (int i = 0; i < count; i++) {
1757            CellLayout cl = ((CellLayout) getChildAt(i));
1758            mScreenOrder.add(getIdForScreen(cl));
1759        }
1760        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1761
1762        // Re-enable auto layout transitions for page deletion.
1763        setLayoutTransition(mLayoutTransition);
1764    }
1765
1766    public boolean isInOverviewMode() {
1767        return mState == State.OVERVIEW;
1768    }
1769
1770    public void enterOverviewMode() {
1771        enableOverviewMode(true, -1);
1772    }
1773
1774    public void exitOverviewMode() {
1775        exitOverviewMode(-1);
1776    }
1777
1778    public void exitOverviewMode(int snapPage) {
1779        enableOverviewMode(false, snapPage);
1780    }
1781
1782    private void enableOverviewMode(boolean enable, int snapPage) {
1783        State finalState = Workspace.State.OVERVIEW;
1784        if (!enable) {
1785            finalState = Workspace.State.NORMAL;
1786        }
1787
1788        Animator workspaceAnim = getChangeStateAnimation(finalState, true, 0, snapPage);
1789        workspaceAnim.addListener(new AnimatorListenerAdapter() {
1790            @Override
1791            public void onAnimationEnd(Animator arg0) {
1792                mIsSwitchingState = false;
1793            }
1794            @Override
1795            public void onAnimationStart(Animator arg0) {
1796                mIsSwitchingState = true;
1797            }
1798        });
1799        workspaceAnim.start();
1800    }
1801
1802    Animator getChangeStateAnimation(final State state, boolean animated, int delay, int snapPage) {
1803        if (mState == state) {
1804            return null;
1805        }
1806
1807        // Initialize animation arrays for the first time if necessary
1808        initAnimationArrays();
1809
1810        AnimatorSet anim = animated ? LauncherAnimUtils.createAnimatorSet() : null;
1811
1812        final State oldState = mState;
1813        final boolean oldStateIsNormal = (oldState == State.NORMAL);
1814        final boolean oldStateIsSpringLoaded = (oldState == State.SPRING_LOADED);
1815        final boolean oldStateIsSmall = (oldState == State.SMALL);
1816        final boolean oldStateIsOverview = (oldState == State.OVERVIEW);
1817        mState = state;
1818        final boolean stateIsNormal = (state == State.NORMAL);
1819        final boolean stateIsSpringLoaded = (state == State.SPRING_LOADED);
1820        final boolean stateIsSmall = (state == State.SMALL);
1821        final boolean stateIsOverview = (state == State.OVERVIEW);
1822        float finalBackgroundAlpha = stateIsSpringLoaded ? 1.0f : 0f;
1823        float finalHotseatAndPageIndicatorAlpha = (stateIsOverview || stateIsSmall) ? 0f : 1f;
1824        float finalOverviewPanelAlpha = stateIsOverview ? 1f : 0f;
1825
1826        boolean zoomIn = true;
1827        mNewScale = 1.0f;
1828
1829        if (oldStateIsOverview) {
1830            disableFreeScroll(snapPage);
1831        } else if (stateIsOverview) {
1832            enableFreeScroll();
1833        }
1834
1835        if (state != State.NORMAL) {
1836            if (stateIsSpringLoaded) {
1837                mNewScale = mSpringLoadedShrinkFactor;
1838            } else if (stateIsOverview) {
1839                mNewScale = mOverviewModeShrinkFactor;
1840            } else if (stateIsSmall){
1841                mNewScale = mOverviewModeShrinkFactor - 0.1f;
1842            }
1843            if (oldStateIsNormal && stateIsSmall) {
1844                zoomIn = false;
1845                updateChildrenLayersEnabled(false);
1846            } else {
1847                finalBackgroundAlpha = 1.0f;
1848            }
1849        }
1850        final int duration = zoomIn ?
1851                getResources().getInteger(R.integer.config_workspaceUnshrinkTime) :
1852                getResources().getInteger(R.integer.config_appsCustomizeWorkspaceShrinkTime);
1853        for (int i = 0; i < getChildCount(); i++) {
1854            final CellLayout cl = (CellLayout) getChildAt(i);
1855            float finalAlpha = (!mWorkspaceFadeInAdjacentScreens || stateIsSpringLoaded ||
1856                    (i == mCurrentPage)) ? 1f : 0f;
1857            float currentAlpha = cl.getShortcutsAndWidgets().getAlpha();
1858            float initialAlpha = currentAlpha;
1859
1860            // Determine the pages alpha during the state transition
1861            if ((oldStateIsSmall && stateIsNormal) ||
1862                (oldStateIsNormal && stateIsSmall)) {
1863                // To/from workspace - only show the current page unless the transition is not
1864                //                     animated and the animation end callback below doesn't run;
1865                //                     or, if we're in spring-loaded mode
1866                if (i == mCurrentPage || !animated || oldStateIsSpringLoaded) {
1867                    finalAlpha = 1f;
1868                } else {
1869                    initialAlpha = 0f;
1870                    finalAlpha = 0f;
1871                }
1872            }
1873
1874            mOldAlphas[i] = initialAlpha;
1875            mNewAlphas[i] = finalAlpha;
1876            if (animated) {
1877                mOldBackgroundAlphas[i] = cl.getBackgroundAlpha();
1878                mNewBackgroundAlphas[i] = finalBackgroundAlpha;
1879            } else {
1880                setScaleX(mNewScale);
1881                setScaleY(mNewScale);
1882                cl.setBackgroundAlpha(finalBackgroundAlpha);
1883                cl.setShortcutAndWidgetAlpha(finalAlpha);
1884            }
1885        }
1886
1887        if (animated) {
1888            LauncherViewPropertyAnimator scale = new LauncherViewPropertyAnimator(this);
1889            scale.scaleX(mNewScale)
1890                .scaleY(mNewScale)
1891                .setInterpolator(mZoomInInterpolator);
1892            anim.play(scale);
1893            for (int index = 0; index < getChildCount(); index++) {
1894                final int i = index;
1895                final CellLayout cl = (CellLayout) getChildAt(i);
1896                float currentAlpha = cl.getShortcutsAndWidgets().getAlpha();
1897                if (mOldAlphas[i] == 0 && mNewAlphas[i] == 0) {
1898                    cl.setBackgroundAlpha(mNewBackgroundAlphas[i]);
1899                    cl.setShortcutAndWidgetAlpha(mNewAlphas[i]);
1900                } else {
1901
1902                    if (mOldAlphas[i] != mNewAlphas[i] || currentAlpha != mNewAlphas[i]) {
1903                        LauncherViewPropertyAnimator alphaAnim =
1904                            new LauncherViewPropertyAnimator(cl.getShortcutsAndWidgets());
1905                        alphaAnim.alpha(mNewAlphas[i])
1906                            .setDuration(duration)
1907                            .setInterpolator(mZoomInInterpolator);
1908                        anim.play(alphaAnim);
1909                    }
1910                    if (mOldBackgroundAlphas[i] != 0 ||
1911                        mNewBackgroundAlphas[i] != 0) {
1912                        ValueAnimator bgAnim =
1913                                LauncherAnimUtils.ofFloat(cl, 0f, 1f).setDuration(duration);
1914                        bgAnim.setInterpolator(mZoomInInterpolator);
1915                        bgAnim.addUpdateListener(new LauncherAnimatorUpdateListener() {
1916                                public void onAnimationUpdate(float a, float b) {
1917                                    cl.setBackgroundAlpha(
1918                                            a * mOldBackgroundAlphas[i] +
1919                                            b * mNewBackgroundAlphas[i]);
1920                                }
1921                            });
1922                        anim.play(bgAnim);
1923                    }
1924                }
1925            }
1926            ObjectAnimator hotseatAlpha = ObjectAnimator.ofFloat(mLauncher.getHotseat(), "alpha",
1927                    finalHotseatAndPageIndicatorAlpha);
1928            ObjectAnimator pageIndicatorAlpha = ObjectAnimator.ofFloat(getPageIndicator(), "alpha",
1929                    finalHotseatAndPageIndicatorAlpha);
1930            ObjectAnimator overviewPanelAlpha = ObjectAnimator.ofFloat(mLauncher.getOverviewPanel(),
1931                    "alpha", finalOverviewPanelAlpha);
1932            overviewPanelAlpha.addUpdateListener(new AlphaUpdateListener(
1933                    mLauncher.getOverviewPanel()));
1934            hotseatAlpha.addUpdateListener(new AlphaUpdateListener(mLauncher.getHotseat()));
1935            pageIndicatorAlpha.addUpdateListener(new AlphaUpdateListener(getPageIndicator()));
1936            anim.play(overviewPanelAlpha);
1937            anim.play(hotseatAlpha);
1938            anim.play(pageIndicatorAlpha);
1939            anim.setStartDelay(delay);
1940        } else {
1941            mLauncher.getOverviewPanel().setAlpha(finalOverviewPanelAlpha);
1942            mLauncher.getHotseat().setAlpha(finalHotseatAndPageIndicatorAlpha);
1943            getPageIndicator().setAlpha(finalHotseatAndPageIndicatorAlpha);
1944        }
1945
1946        if (stateIsSpringLoaded) {
1947            // Right now we're covered by Apps Customize
1948            // Show the background gradient immediately, so the gradient will
1949            // be showing once AppsCustomize disappears
1950            animateBackgroundGradient(getResources().getInteger(
1951                    R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f, false);
1952        } else {
1953            // Fade the background gradient away
1954            animateBackgroundGradient(0f, true);
1955        }
1956        return anim;
1957    }
1958
1959    class AlphaUpdateListener implements AnimatorUpdateListener {
1960        View view;
1961        public AlphaUpdateListener(View v) {
1962            view = v;
1963        }
1964
1965        @Override
1966        public void onAnimationUpdate(ValueAnimator arg0) {
1967            if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != INVISIBLE) {
1968                view.setVisibility(INVISIBLE);
1969            } else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
1970                    && view.getVisibility() != VISIBLE) {
1971                view.setVisibility(VISIBLE);
1972            }
1973        }
1974
1975    }
1976
1977    @Override
1978    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
1979        mIsSwitchingState = true;
1980        updateChildrenLayersEnabled(false);
1981    }
1982
1983    @Override
1984    public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) {
1985    }
1986
1987    @Override
1988    public void onLauncherTransitionStep(Launcher l, float t) {
1989        mTransitionProgress = t;
1990    }
1991
1992    @Override
1993    public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) {
1994        mIsSwitchingState = false;
1995        mWallpaperOffset.setOverrideHorizontalCatchupConstant(false);
1996        updateChildrenLayersEnabled(false);
1997        // The code in getChangeStateAnimation to determine initialAlpha and finalAlpha will ensure
1998        // ensure that only the current page is visible during (and subsequently, after) the
1999        // transition animation.  If fade adjacent pages is disabled, then re-enable the page
2000        // visibility after the transition animation.
2001        if (!mWorkspaceFadeInAdjacentScreens) {
2002            for (int i = 0; i < getChildCount(); i++) {
2003                final CellLayout cl = (CellLayout) getChildAt(i);
2004                cl.setShortcutAndWidgetAlpha(1f);
2005            }
2006        }
2007    }
2008
2009    @Override
2010    public View getContent() {
2011        return this;
2012    }
2013
2014    /**
2015     * Draw the View v into the given Canvas.
2016     *
2017     * @param v the view to draw
2018     * @param destCanvas the canvas to draw on
2019     * @param padding the horizontal and vertical padding to use when drawing
2020     */
2021    private void drawDragView(View v, Canvas destCanvas, int padding, boolean pruneToDrawable) {
2022        final Rect clipRect = mTempRect;
2023        v.getDrawingRect(clipRect);
2024
2025        boolean textVisible = false;
2026
2027        destCanvas.save();
2028        if (v instanceof TextView && pruneToDrawable) {
2029            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2030            clipRect.set(0, 0, d.getIntrinsicWidth() + padding, d.getIntrinsicHeight() + padding);
2031            destCanvas.translate(padding / 2, padding / 2);
2032            d.draw(destCanvas);
2033        } else {
2034            if (v instanceof FolderIcon) {
2035                // For FolderIcons the text can bleed into the icon area, and so we need to
2036                // hide the text completely (which can't be achieved by clipping).
2037                if (((FolderIcon) v).getTextVisible()) {
2038                    ((FolderIcon) v).setTextVisible(false);
2039                    textVisible = true;
2040                }
2041            } else if (v instanceof BubbleTextView) {
2042                final BubbleTextView tv = (BubbleTextView) v;
2043                clipRect.bottom = tv.getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V +
2044                        tv.getLayout().getLineTop(0);
2045            } else if (v instanceof TextView) {
2046                final TextView tv = (TextView) v;
2047                clipRect.bottom = tv.getExtendedPaddingTop() - tv.getCompoundDrawablePadding() +
2048                        tv.getLayout().getLineTop(0);
2049            }
2050            destCanvas.translate(-v.getScrollX() + padding / 2, -v.getScrollY() + padding / 2);
2051            destCanvas.clipRect(clipRect, Op.REPLACE);
2052            v.draw(destCanvas);
2053
2054            // Restore text visibility of FolderIcon if necessary
2055            if (textVisible) {
2056                ((FolderIcon) v).setTextVisible(true);
2057            }
2058        }
2059        destCanvas.restore();
2060    }
2061
2062    /**
2063     * Returns a new bitmap to show when the given View is being dragged around.
2064     * Responsibility for the bitmap is transferred to the caller.
2065     */
2066    public Bitmap createDragBitmap(View v, Canvas canvas, int padding) {
2067        Bitmap b;
2068
2069        if (v instanceof TextView) {
2070            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2071            b = Bitmap.createBitmap(d.getIntrinsicWidth() + padding,
2072                    d.getIntrinsicHeight() + padding, Bitmap.Config.ARGB_8888);
2073        } else {
2074            b = Bitmap.createBitmap(
2075                    v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2076        }
2077
2078        canvas.setBitmap(b);
2079        drawDragView(v, canvas, padding, true);
2080        canvas.setBitmap(null);
2081
2082        return b;
2083    }
2084
2085    /**
2086     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2087     * Responsibility for the bitmap is transferred to the caller.
2088     */
2089    private Bitmap createDragOutline(View v, Canvas canvas, int padding) {
2090        final int outlineColor = getResources().getColor(android.R.color.holo_blue_light);
2091        final Bitmap b = Bitmap.createBitmap(
2092                v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2093
2094        canvas.setBitmap(b);
2095        drawDragView(v, canvas, padding, true);
2096        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor);
2097        canvas.setBitmap(null);
2098        return b;
2099    }
2100
2101    /**
2102     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2103     * Responsibility for the bitmap is transferred to the caller.
2104     */
2105    private Bitmap createDragOutline(Bitmap orig, Canvas canvas, int padding, int w, int h,
2106            boolean clipAlpha) {
2107        final int outlineColor = getResources().getColor(android.R.color.holo_blue_light);
2108        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
2109        canvas.setBitmap(b);
2110
2111        Rect src = new Rect(0, 0, orig.getWidth(), orig.getHeight());
2112        float scaleFactor = Math.min((w - padding) / (float) orig.getWidth(),
2113                (h - padding) / (float) orig.getHeight());
2114        int scaledWidth = (int) (scaleFactor * orig.getWidth());
2115        int scaledHeight = (int) (scaleFactor * orig.getHeight());
2116        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
2117
2118        // center the image
2119        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
2120
2121        canvas.drawBitmap(orig, src, dst, null);
2122        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor,
2123                clipAlpha);
2124        canvas.setBitmap(null);
2125
2126        return b;
2127    }
2128
2129    void startDrag(CellLayout.CellInfo cellInfo) {
2130        View child = cellInfo.cell;
2131
2132        // Make sure the drag was started by a long press as opposed to a long click.
2133        if (!child.isInTouchMode()) {
2134            return;
2135        }
2136
2137        mDragInfo = cellInfo;
2138        child.setVisibility(INVISIBLE);
2139        CellLayout layout = (CellLayout) child.getParent().getParent();
2140        layout.prepareChildForDrag(child);
2141
2142        child.clearFocus();
2143        child.setPressed(false);
2144
2145        final Canvas canvas = new Canvas();
2146
2147        // The outline is used to visualize where the item will land if dropped
2148        mDragOutline = createDragOutline(child, canvas, DRAG_BITMAP_PADDING);
2149        beginDragShared(child, this);
2150    }
2151
2152    public void beginDragShared(View child, DragSource source) {
2153        Resources r = getResources();
2154
2155        // The drag bitmap follows the touch point around on the screen
2156        final Bitmap b = createDragBitmap(child, new Canvas(), DRAG_BITMAP_PADDING);
2157
2158        final int bmpWidth = b.getWidth();
2159        final int bmpHeight = b.getHeight();
2160
2161        float scale = mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY);
2162        int dragLayerX =
2163                Math.round(mTempXY[0] - (bmpWidth - scale * child.getWidth()) / 2);
2164        int dragLayerY =
2165                Math.round(mTempXY[1] - (bmpHeight - scale * bmpHeight) / 2
2166                        - DRAG_BITMAP_PADDING / 2);
2167
2168        Point dragVisualizeOffset = null;
2169        Rect dragRect = null;
2170        if (child instanceof BubbleTextView || child instanceof PagedViewIcon) {
2171            int iconSize = r.getDimensionPixelSize(R.dimen.app_icon_size);
2172            int iconPaddingTop = r.getDimensionPixelSize(R.dimen.app_icon_padding_top);
2173            int top = child.getPaddingTop();
2174            int left = (bmpWidth - iconSize) / 2;
2175            int right = left + iconSize;
2176            int bottom = top + iconSize;
2177            dragLayerY += top;
2178            // Note: The drag region is used to calculate drag layer offsets, but the
2179            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2180            dragVisualizeOffset = new Point(-DRAG_BITMAP_PADDING / 2,
2181                    iconPaddingTop - DRAG_BITMAP_PADDING / 2);
2182            dragRect = new Rect(left, top, right, bottom);
2183        } else if (child instanceof FolderIcon) {
2184            int previewSize = r.getDimensionPixelSize(R.dimen.folder_preview_size);
2185            dragRect = new Rect(0, 0, child.getWidth(), previewSize);
2186        }
2187
2188        // Clear the pressed state if necessary
2189        if (child instanceof BubbleTextView) {
2190            BubbleTextView icon = (BubbleTextView) child;
2191            icon.clearPressedOrFocusedBackground();
2192        }
2193
2194        mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(),
2195                DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect, scale);
2196        b.recycle();
2197    }
2198
2199    void addApplicationShortcut(ShortcutInfo info, CellLayout target, long container, long screenId,
2200            int cellX, int cellY, boolean insertAtFirst, int intersectX, int intersectY) {
2201        View view = mLauncher.createShortcut(R.layout.application, target, (ShortcutInfo) info);
2202
2203        final int[] cellXY = new int[2];
2204        target.findCellForSpanThatIntersects(cellXY, 1, 1, intersectX, intersectY);
2205        addInScreen(view, container, screenId, cellXY[0], cellXY[1], 1, 1, insertAtFirst);
2206
2207        LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId, cellXY[0],
2208                cellXY[1]);
2209    }
2210
2211    public boolean transitionStateShouldAllowDrop() {
2212        return ((!isSwitchingState() || mTransitionProgress > 0.5f) && mState != State.SMALL);
2213    }
2214
2215    /**
2216     * {@inheritDoc}
2217     */
2218    public boolean acceptDrop(DragObject d) {
2219        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2220        CellLayout dropTargetLayout = mDropToLayout;
2221        if (d.dragSource != this) {
2222            // Don't accept the drop if we're not over a screen at time of drop
2223            if (dropTargetLayout == null) {
2224                return false;
2225            }
2226            if (!transitionStateShouldAllowDrop()) return false;
2227
2228            mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
2229                    d.dragView, mDragViewVisualCenter);
2230
2231            // We want the point to be mapped to the dragTarget.
2232            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2233                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2234            } else {
2235                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter, null);
2236            }
2237
2238            int spanX = 1;
2239            int spanY = 1;
2240            if (mDragInfo != null) {
2241                final CellLayout.CellInfo dragCellInfo = mDragInfo;
2242                spanX = dragCellInfo.spanX;
2243                spanY = dragCellInfo.spanY;
2244            } else {
2245                final ItemInfo dragInfo = (ItemInfo) d.dragInfo;
2246                spanX = dragInfo.spanX;
2247                spanY = dragInfo.spanY;
2248            }
2249
2250            int minSpanX = spanX;
2251            int minSpanY = spanY;
2252            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2253                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2254                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2255            }
2256
2257            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2258                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2259                    mTargetCell);
2260            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2261                    mDragViewVisualCenter[1], mTargetCell);
2262            if (willCreateUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2263                    mTargetCell, distance, true)) {
2264                return true;
2265            }
2266            if (willAddToExistingUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2267                    mTargetCell, distance)) {
2268                return true;
2269            }
2270
2271            int[] resultSpan = new int[2];
2272            mTargetCell = dropTargetLayout.createArea((int) mDragViewVisualCenter[0],
2273                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
2274                    null, mTargetCell, resultSpan, CellLayout.MODE_ACCEPT_DROP);
2275            boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2276
2277            // Don't accept the drop if there's no room for the item
2278            if (!foundCell) {
2279                // Don't show the message if we are dropping on the AllApps button and the hotseat
2280                // is full
2281                boolean isHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2282                if (mTargetCell != null && isHotseat) {
2283                    Hotseat hotseat = mLauncher.getHotseat();
2284                    if (hotseat.isAllAppsButtonRank(
2285                            hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]))) {
2286                        return false;
2287                    }
2288                }
2289
2290                mLauncher.showOutOfSpaceMessage(isHotseat);
2291                return false;
2292            }
2293        }
2294
2295        long screenId = getIdForScreen(dropTargetLayout);
2296        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
2297            commitExtraEmptyScreen();
2298        }
2299
2300        return true;
2301    }
2302
2303    boolean willCreateUserFolder(ItemInfo info, CellLayout target, int[] targetCell, float
2304            distance, boolean considerTimeout) {
2305        if (distance > mMaxDistanceForFolderCreation) return false;
2306        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2307
2308        if (dropOverView != null) {
2309            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2310            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2311                return false;
2312            }
2313        }
2314
2315        boolean hasntMoved = false;
2316        if (mDragInfo != null) {
2317            hasntMoved = dropOverView == mDragInfo.cell;
2318        }
2319
2320        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2321            return false;
2322        }
2323
2324        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2325        boolean willBecomeShortcut =
2326                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2327                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT);
2328
2329        return (aboveShortcut && willBecomeShortcut);
2330    }
2331
2332    boolean willAddToExistingUserFolder(Object dragInfo, CellLayout target, int[] targetCell,
2333            float distance) {
2334        if (distance > mMaxDistanceForFolderCreation) return false;
2335        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2336
2337        if (dropOverView != null) {
2338            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2339            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2340                return false;
2341            }
2342        }
2343
2344        if (dropOverView instanceof FolderIcon) {
2345            FolderIcon fi = (FolderIcon) dropOverView;
2346            if (fi.acceptDrop(dragInfo)) {
2347                return true;
2348            }
2349        }
2350        return false;
2351    }
2352
2353    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2354            int[] targetCell, float distance, boolean external, DragView dragView,
2355            Runnable postAnimationRunnable) {
2356        if (distance > mMaxDistanceForFolderCreation) return false;
2357        View v = target.getChildAt(targetCell[0], targetCell[1]);
2358
2359        boolean hasntMoved = false;
2360        if (mDragInfo != null) {
2361            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2362            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2363                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2364        }
2365
2366        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2367        mCreateUserFolderOnDrop = false;
2368        final long screenId = (targetCell == null) ? mDragInfo.screenId : getIdForScreen(target);
2369
2370        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2371        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2372
2373        if (aboveShortcut && willBecomeShortcut) {
2374            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2375            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2376            // if the drag started here, we need to remove it from the workspace
2377            if (!external) {
2378                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2379            }
2380
2381            Rect folderLocation = new Rect();
2382            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2383            target.removeView(v);
2384
2385            FolderIcon fi =
2386                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2387            destInfo.cellX = -1;
2388            destInfo.cellY = -1;
2389            sourceInfo.cellX = -1;
2390            sourceInfo.cellY = -1;
2391
2392            // If the dragView is null, we can't animate
2393            boolean animate = dragView != null;
2394            if (animate) {
2395                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2396                        postAnimationRunnable);
2397            } else {
2398                fi.addItem(destInfo);
2399                fi.addItem(sourceInfo);
2400            }
2401            return true;
2402        }
2403        return false;
2404    }
2405
2406    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2407            float distance, DragObject d, boolean external) {
2408        if (distance > mMaxDistanceForFolderCreation) return false;
2409
2410        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2411        if (!mAddToExistingFolderOnDrop) return false;
2412        mAddToExistingFolderOnDrop = false;
2413
2414        if (dropOverView instanceof FolderIcon) {
2415            FolderIcon fi = (FolderIcon) dropOverView;
2416            if (fi.acceptDrop(d.dragInfo)) {
2417                fi.onDrop(d);
2418
2419                // if the drag started here, we need to remove it from the workspace
2420                if (!external) {
2421                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2422                }
2423                return true;
2424            }
2425        }
2426        return false;
2427    }
2428
2429    public void onDrop(final DragObject d) {
2430        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset, d.dragView,
2431                mDragViewVisualCenter);
2432
2433        CellLayout dropTargetLayout = mDropToLayout;
2434
2435        // We want the point to be mapped to the dragTarget.
2436        if (dropTargetLayout != null) {
2437            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2438                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2439            } else {
2440                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter, null);
2441            }
2442        }
2443
2444        int snapScreen = -1;
2445        boolean resizeOnDrop = false;
2446        if (d.dragSource != this) {
2447            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2448                    (int) mDragViewVisualCenter[1] };
2449            onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d);
2450        } else if (mDragInfo != null) {
2451            final View cell = mDragInfo.cell;
2452
2453            Runnable resizeRunnable = null;
2454            if (dropTargetLayout != null && !d.cancelled) {
2455                // Move internally
2456                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2457                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2458                long container = hasMovedIntoHotseat ?
2459                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2460                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2461                long screenId = (mTargetCell[0] < 0) ?
2462                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2463                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2464                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2465                // First we find the cell nearest to point at which the item is
2466                // dropped, without any consideration to whether there is an item there.
2467
2468                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2469                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2470                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2471                        mDragViewVisualCenter[1], mTargetCell);
2472
2473                // If the item being dropped is a shortcut and the nearest drop
2474                // cell also contains a shortcut, then create a folder with the two shortcuts.
2475                if (!mInScrollArea && createUserFolderIfNecessary(cell, container,
2476                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2477                    stripEmptyScreens();
2478                    return;
2479                }
2480
2481                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2482                        distance, d, false)) {
2483                    stripEmptyScreens();
2484                    return;
2485                }
2486
2487                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2488                // we need to find the nearest cell location that is vacant
2489                ItemInfo item = (ItemInfo) d.dragInfo;
2490                int minSpanX = item.spanX;
2491                int minSpanY = item.spanY;
2492                if (item.minSpanX > 0 && item.minSpanY > 0) {
2493                    minSpanX = item.minSpanX;
2494                    minSpanY = item.minSpanY;
2495                }
2496
2497                int[] resultSpan = new int[2];
2498                mTargetCell = dropTargetLayout.createArea((int) mDragViewVisualCenter[0],
2499                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2500                        mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2501
2502                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2503
2504                // if the widget resizes on drop
2505                if (foundCell && (cell instanceof AppWidgetHostView) &&
2506                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2507                    resizeOnDrop = true;
2508                    item.spanX = resultSpan[0];
2509                    item.spanY = resultSpan[1];
2510                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2511                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2512                            resultSpan[1]);
2513                }
2514
2515                if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2516                    snapScreen = getPageIndexForScreenId(screenId);
2517                    snapToPage(snapScreen);
2518                }
2519
2520                if (foundCell) {
2521                    final ItemInfo info = (ItemInfo) cell.getTag();
2522                    if (hasMovedLayouts) {
2523                        // Reparent the view
2524                        getParentCellLayoutForView(cell).removeView(cell);
2525                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2526                                info.spanX, info.spanY);
2527                    }
2528
2529                    // update the item's position after drop
2530                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2531                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2532                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2533                    lp.cellHSpan = item.spanX;
2534                    lp.cellVSpan = item.spanY;
2535                    lp.isLockedToGrid = true;
2536                    cell.setId(LauncherModel.getCellLayoutChildId(container, mDragInfo.screenId,
2537                            mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY));
2538
2539                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2540                            cell instanceof LauncherAppWidgetHostView) {
2541                        final CellLayout cellLayout = dropTargetLayout;
2542                        // We post this call so that the widget has a chance to be placed
2543                        // in its final location
2544
2545                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2546                        AppWidgetProviderInfo pinfo = hostView.getAppWidgetInfo();
2547                        if (pinfo != null &&
2548                                pinfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE) {
2549                            final Runnable addResizeFrame = new Runnable() {
2550                                public void run() {
2551                                    DragLayer dragLayer = mLauncher.getDragLayer();
2552                                    dragLayer.addResizeFrame(info, hostView, cellLayout);
2553                                }
2554                            };
2555                            resizeRunnable = (new Runnable() {
2556                                public void run() {
2557                                    if (!isPageMoving()) {
2558                                        addResizeFrame.run();
2559                                    } else {
2560                                        mDelayedResizeRunnable = addResizeFrame;
2561                                    }
2562                                }
2563                            });
2564                        }
2565                    }
2566
2567                    LauncherModel.moveItemInDatabase(mLauncher, info, container, screenId, lp.cellX,
2568                            lp.cellY);
2569                } else {
2570                    // If we can't find a drop location, we return the item to its original position
2571                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2572                    mTargetCell[0] = lp.cellX;
2573                    mTargetCell[1] = lp.cellY;
2574                    CellLayout layout = (CellLayout) cell.getParent().getParent();
2575                    layout.markCellsAsOccupiedForView(cell);
2576                }
2577            }
2578
2579            final CellLayout parent = (CellLayout) cell.getParent().getParent();
2580            final Runnable finalResizeRunnable = resizeRunnable;
2581            // Prepare it to be animated into its new position
2582            // This must be called after the view has been re-parented
2583            final Runnable onCompleteRunnable = new Runnable() {
2584                @Override
2585                public void run() {
2586                    mAnimatingViewIntoPlace = false;
2587                    updateChildrenLayersEnabled(false);
2588                    if (finalResizeRunnable != null) {
2589                        finalResizeRunnable.run();
2590                    }
2591                    stripEmptyScreens();
2592                }
2593            };
2594            mAnimatingViewIntoPlace = true;
2595            if (d.dragView.hasDrawn()) {
2596                final ItemInfo info = (ItemInfo) cell.getTag();
2597                if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET) {
2598                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2599                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2600                    animateWidgetDrop(info, parent, d.dragView,
2601                            onCompleteRunnable, animationType, cell, false);
2602                } else {
2603                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2604                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2605                            onCompleteRunnable, this);
2606                }
2607            } else {
2608                d.deferDragViewCleanupPostAnimation = false;
2609                cell.setVisibility(VISIBLE);
2610            }
2611            parent.onDropChild(cell);
2612        }
2613    }
2614
2615    public void setFinalScrollForPageChange(int pageIndex) {
2616        CellLayout cl = (CellLayout) getChildAt(pageIndex);
2617        if (cl != null) {
2618            mSavedScrollX = getScrollX();
2619            mSavedTranslationX = cl.getTranslationX();
2620            mSavedRotationY = cl.getRotationY();
2621            final int newX = getScrollForPage(pageIndex);
2622            setScrollX(newX);
2623            cl.setTranslationX(0f);
2624            cl.setRotationY(0f);
2625        }
2626    }
2627
2628    public void resetFinalScrollForPageChange(int pageIndex) {
2629        if (pageIndex >= 0) {
2630            CellLayout cl = (CellLayout) getChildAt(pageIndex);
2631            setScrollX(mSavedScrollX);
2632            cl.setTranslationX(mSavedTranslationX);
2633            cl.setRotationY(mSavedRotationY);
2634        }
2635    }
2636
2637    public void getViewLocationRelativeToSelf(View v, int[] location) {
2638        getLocationInWindow(location);
2639        int x = location[0];
2640        int y = location[1];
2641
2642        v.getLocationInWindow(location);
2643        int vX = location[0];
2644        int vY = location[1];
2645
2646        location[0] = vX - x;
2647        location[1] = vY - y;
2648    }
2649
2650    public void onDragEnter(DragObject d) {
2651        mDragEnforcer.onDragEnter();
2652        mCreateUserFolderOnDrop = false;
2653        mAddToExistingFolderOnDrop = false;
2654
2655        mDropToLayout = null;
2656        CellLayout layout = getCurrentDropLayout();
2657        setCurrentDropLayout(layout);
2658        setCurrentDragOverlappingLayout(layout);
2659
2660        // Because we don't have space in the Phone UI (the CellLayouts run to the edge) we
2661        // don't need to show the outlines
2662        if (LauncherAppState.getInstance().isScreenLarge()) {
2663            showOutlines();
2664        }
2665    }
2666
2667    static Rect getCellLayoutMetrics(Launcher launcher, int orientation) {
2668        Resources res = launcher.getResources();
2669        Display display = launcher.getWindowManager().getDefaultDisplay();
2670        Point smallestSize = new Point();
2671        Point largestSize = new Point();
2672        display.getCurrentSizeRange(smallestSize, largestSize);
2673        if (orientation == CellLayout.LANDSCAPE) {
2674            if (mLandscapeCellLayoutMetrics == null) {
2675                int paddingLeft = res.getDimensionPixelSize(R.dimen.workspace_left_padding_land);
2676                int paddingRight = res.getDimensionPixelSize(R.dimen.workspace_right_padding_land);
2677                int paddingTop = res.getDimensionPixelSize(R.dimen.workspace_top_padding_land);
2678                int paddingBottom = res.getDimensionPixelSize(R.dimen.workspace_bottom_padding_land);
2679                int width = largestSize.x - paddingLeft - paddingRight;
2680                int height = smallestSize.y - paddingTop - paddingBottom;
2681                mLandscapeCellLayoutMetrics = new Rect();
2682                CellLayout.getMetrics(mLandscapeCellLayoutMetrics, res,
2683                        width, height, LauncherModel.getCellCountX(), LauncherModel.getCellCountY(),
2684                        orientation);
2685            }
2686            return mLandscapeCellLayoutMetrics;
2687        } else if (orientation == CellLayout.PORTRAIT) {
2688            if (mPortraitCellLayoutMetrics == null) {
2689                int paddingLeft = res.getDimensionPixelSize(R.dimen.workspace_left_padding_land);
2690                int paddingRight = res.getDimensionPixelSize(R.dimen.workspace_right_padding_land);
2691                int paddingTop = res.getDimensionPixelSize(R.dimen.workspace_top_padding_land);
2692                int paddingBottom = res.getDimensionPixelSize(R.dimen.workspace_bottom_padding_land);
2693                int width = smallestSize.x - paddingLeft - paddingRight;
2694                int height = largestSize.y - paddingTop - paddingBottom;
2695                mPortraitCellLayoutMetrics = new Rect();
2696                CellLayout.getMetrics(mPortraitCellLayoutMetrics, res,
2697                        width, height, LauncherModel.getCellCountX(), LauncherModel.getCellCountY(),
2698                        orientation);
2699            }
2700            return mPortraitCellLayoutMetrics;
2701        }
2702        return null;
2703    }
2704
2705    public void onDragExit(DragObject d) {
2706        mDragEnforcer.onDragExit();
2707
2708        // Here we store the final page that will be dropped to, if the workspace in fact
2709        // receives the drop
2710        if (mInScrollArea) {
2711            if (isPageMoving()) {
2712                // If the user drops while the page is scrolling, we should use that page as the
2713                // destination instead of the page that is being hovered over.
2714                mDropToLayout = (CellLayout) getPageAt(getNextPage());
2715            } else {
2716                mDropToLayout = mDragOverlappingLayout;
2717            }
2718        } else {
2719            mDropToLayout = mDragTargetLayout;
2720        }
2721
2722        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2723            mCreateUserFolderOnDrop = true;
2724        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2725            mAddToExistingFolderOnDrop = true;
2726        }
2727
2728        // Reset the scroll area and previous drag target
2729        onResetScrollArea();
2730        setCurrentDropLayout(null);
2731        setCurrentDragOverlappingLayout(null);
2732
2733        mSpringLoadedDragController.cancel();
2734
2735        if (!mIsPageMoving) {
2736            hideOutlines();
2737        }
2738    }
2739
2740    void setCurrentDropLayout(CellLayout layout) {
2741        if (mDragTargetLayout != null) {
2742            mDragTargetLayout.revertTempState();
2743            mDragTargetLayout.onDragExit();
2744        }
2745        mDragTargetLayout = layout;
2746        if (mDragTargetLayout != null) {
2747            mDragTargetLayout.onDragEnter();
2748        }
2749        cleanupReorder(true);
2750        cleanupFolderCreation();
2751        setCurrentDropOverCell(-1, -1);
2752    }
2753
2754    void setCurrentDragOverlappingLayout(CellLayout layout) {
2755        if (mDragOverlappingLayout != null) {
2756            mDragOverlappingLayout.setIsDragOverlapping(false);
2757        }
2758        mDragOverlappingLayout = layout;
2759        if (mDragOverlappingLayout != null) {
2760            mDragOverlappingLayout.setIsDragOverlapping(true);
2761        }
2762        invalidate();
2763    }
2764
2765    void setCurrentDropOverCell(int x, int y) {
2766        if (x != mDragOverX || y != mDragOverY) {
2767            mDragOverX = x;
2768            mDragOverY = y;
2769            setDragMode(DRAG_MODE_NONE);
2770        }
2771    }
2772
2773    void setDragMode(int dragMode) {
2774        if (dragMode != mDragMode) {
2775            if (dragMode == DRAG_MODE_NONE) {
2776                cleanupAddToFolder();
2777                // We don't want to cancel the re-order alarm every time the target cell changes
2778                // as this feels to slow / unresponsive.
2779                cleanupReorder(false);
2780                cleanupFolderCreation();
2781            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2782                cleanupReorder(true);
2783                cleanupFolderCreation();
2784            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2785                cleanupAddToFolder();
2786                cleanupReorder(true);
2787            } else if (dragMode == DRAG_MODE_REORDER) {
2788                cleanupAddToFolder();
2789                cleanupFolderCreation();
2790            }
2791            mDragMode = dragMode;
2792        }
2793    }
2794
2795    private void cleanupFolderCreation() {
2796        if (mDragFolderRingAnimator != null) {
2797            mDragFolderRingAnimator.animateToNaturalState();
2798        }
2799        mFolderCreationAlarm.cancelAlarm();
2800    }
2801
2802    private void cleanupAddToFolder() {
2803        if (mDragOverFolderIcon != null) {
2804            mDragOverFolderIcon.onDragExit(null);
2805            mDragOverFolderIcon = null;
2806        }
2807    }
2808
2809    private void cleanupReorder(boolean cancelAlarm) {
2810        // Any pending reorders are canceled
2811        if (cancelAlarm) {
2812            mReorderAlarm.cancelAlarm();
2813        }
2814        mLastReorderX = -1;
2815        mLastReorderY = -1;
2816    }
2817
2818   /*
2819    *
2820    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
2821    * coordinate space. The argument xy is modified with the return result.
2822    *
2823    * if cachedInverseMatrix is not null, this method will just use that matrix instead of
2824    * computing it itself; we use this to avoid redundant matrix inversions in
2825    * findMatchingPageForDragOver
2826    *
2827    */
2828   void mapPointFromSelfToChild(View v, float[] xy, Matrix cachedInverseMatrix) {
2829       xy[0] = xy[0] - v.getLeft();
2830       xy[1] = xy[1] - v.getTop();
2831   }
2832
2833   boolean isPointInSelfOverHotseat(int x, int y, Rect r) {
2834       if (r == null) {
2835           r = new Rect();
2836       }
2837       mTempPt[0] = x;
2838       mTempPt[1] = y;
2839       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
2840       mLauncher.getHotseat().getHitRect(r);
2841       if (r.contains(mTempPt[0], mTempPt[1])) {
2842           return true;
2843       }
2844       return false;
2845   }
2846
2847   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
2848       mTempPt[0] = (int) xy[0];
2849       mTempPt[1] = (int) xy[1];
2850       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
2851       mLauncher.getDragLayer().mapCoordInSelfToDescendent(hotseat.getLayout(), mTempPt);
2852
2853       xy[0] = mTempPt[0];
2854       xy[1] = mTempPt[1];
2855   }
2856
2857   /*
2858    *
2859    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
2860    * the parent View's coordinate space. The argument xy is modified with the return result.
2861    *
2862    */
2863   void mapPointFromChildToSelf(View v, float[] xy) {
2864       xy[0] += v.getLeft();
2865       xy[1] += v.getTop();
2866   }
2867
2868   static private float squaredDistance(float[] point1, float[] point2) {
2869        float distanceX = point1[0] - point2[0];
2870        float distanceY = point2[1] - point2[1];
2871        return distanceX * distanceX + distanceY * distanceY;
2872   }
2873
2874    /*
2875     *
2876     * This method returns the CellLayout that is currently being dragged to. In order to drag
2877     * to a CellLayout, either the touch point must be directly over the CellLayout, or as a second
2878     * strategy, we see if the dragView is overlapping any CellLayout and choose the closest one
2879     *
2880     * Return null if no CellLayout is currently being dragged over
2881     *
2882     */
2883    private CellLayout findMatchingPageForDragOver(
2884            DragView dragView, float originX, float originY, boolean exact) {
2885        // We loop through all the screens (ie CellLayouts) and see which ones overlap
2886        // with the item being dragged and then choose the one that's closest to the touch point
2887        final int screenCount = getChildCount();
2888        CellLayout bestMatchingScreen = null;
2889        float smallestDistSoFar = Float.MAX_VALUE;
2890
2891        for (int i = 0; i < screenCount; i++) {
2892            CellLayout cl = (CellLayout) getChildAt(i);
2893
2894            final float[] touchXy = {originX, originY};
2895            // Transform the touch coordinates to the CellLayout's local coordinates
2896            // If the touch point is within the bounds of the cell layout, we can return immediately
2897            cl.getMatrix().invert(mTempInverseMatrix);
2898            mapPointFromSelfToChild(cl, touchXy, mTempInverseMatrix);
2899
2900            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
2901                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
2902                return cl;
2903            }
2904
2905            if (!exact) {
2906                // Get the center of the cell layout in screen coordinates
2907                final float[] cellLayoutCenter = mTempCellLayoutCenterCoordinates;
2908                cellLayoutCenter[0] = cl.getWidth()/2;
2909                cellLayoutCenter[1] = cl.getHeight()/2;
2910                mapPointFromChildToSelf(cl, cellLayoutCenter);
2911
2912                touchXy[0] = originX;
2913                touchXy[1] = originY;
2914
2915                // Calculate the distance between the center of the CellLayout
2916                // and the touch point
2917                float dist = squaredDistance(touchXy, cellLayoutCenter);
2918
2919                if (dist < smallestDistSoFar) {
2920                    smallestDistSoFar = dist;
2921                    bestMatchingScreen = cl;
2922                }
2923            }
2924        }
2925        return bestMatchingScreen;
2926    }
2927
2928    // This is used to compute the visual center of the dragView. This point is then
2929    // used to visualize drop locations and determine where to drop an item. The idea is that
2930    // the visual center represents the user's interpretation of where the item is, and hence
2931    // is the appropriate point to use when determining drop location.
2932    private float[] getDragViewVisualCenter(int x, int y, int xOffset, int yOffset,
2933            DragView dragView, float[] recycle) {
2934        float res[];
2935        if (recycle == null) {
2936            res = new float[2];
2937        } else {
2938            res = recycle;
2939        }
2940
2941        // First off, the drag view has been shifted in a way that is not represented in the
2942        // x and y values or the x/yOffsets. Here we account for that shift.
2943        x += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetX);
2944        y += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetY);
2945
2946        // These represent the visual top and left of drag view if a dragRect was provided.
2947        // If a dragRect was not provided, then they correspond to the actual view left and
2948        // top, as the dragRect is in that case taken to be the entire dragView.
2949        // R.dimen.dragViewOffsetY.
2950        int left = x - xOffset;
2951        int top = y - yOffset;
2952
2953        // In order to find the visual center, we shift by half the dragRect
2954        res[0] = left + dragView.getDragRegion().width() / 2;
2955        res[1] = top + dragView.getDragRegion().height() / 2;
2956
2957        return res;
2958    }
2959
2960    private boolean isDragWidget(DragObject d) {
2961        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
2962                d.dragInfo instanceof PendingAddWidgetInfo);
2963    }
2964    private boolean isExternalDragWidget(DragObject d) {
2965        return d.dragSource != this && isDragWidget(d);
2966    }
2967
2968    public void onDragOver(DragObject d) {
2969        // Skip drag over events while we are dragging over side pages
2970        if (mInScrollArea || mIsSwitchingState || mState == State.SMALL) return;
2971
2972        Rect r = new Rect();
2973        CellLayout layout = null;
2974        ItemInfo item = (ItemInfo) d.dragInfo;
2975
2976        // Ensure that we have proper spans for the item that we are dropping
2977        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
2978        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
2979            d.dragView, mDragViewVisualCenter);
2980
2981        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
2982        // Identify whether we have dragged over a side page
2983        if (isSmall()) {
2984            if (mLauncher.getHotseat() != null && !isExternalDragWidget(d)) {
2985                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
2986                    layout = mLauncher.getHotseat().getLayout();
2987                }
2988            }
2989            if (layout == null) {
2990                layout = findMatchingPageForDragOver(d.dragView, d.x, d.y, false);
2991            }
2992            if (layout != mDragTargetLayout) {
2993                setCurrentDropLayout(layout);
2994                setCurrentDragOverlappingLayout(layout);
2995
2996                boolean isInSpringLoadedMode = (mState == State.SPRING_LOADED);
2997                if (isInSpringLoadedMode) {
2998                    if (mLauncher.isHotseatLayout(layout)) {
2999                        mSpringLoadedDragController.cancel();
3000                    } else {
3001                        mSpringLoadedDragController.setAlarm(mDragTargetLayout);
3002                    }
3003                }
3004            }
3005        } else {
3006            // Test to see if we are over the hotseat otherwise just use the current page
3007            if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3008                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
3009                    layout = mLauncher.getHotseat().getLayout();
3010                }
3011            }
3012            if (layout == null) {
3013                layout = getCurrentDropLayout();
3014            }
3015            if (layout != mDragTargetLayout) {
3016                setCurrentDropLayout(layout);
3017                setCurrentDragOverlappingLayout(layout);
3018            }
3019        }
3020
3021        // Handle the drag over
3022        if (mDragTargetLayout != null) {
3023            // We want the point to be mapped to the dragTarget.
3024            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3025                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
3026            } else {
3027                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter, null);
3028            }
3029
3030            ItemInfo info = (ItemInfo) d.dragInfo;
3031
3032            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3033                    (int) mDragViewVisualCenter[1], item.spanX, item.spanY,
3034                    mDragTargetLayout, mTargetCell);
3035
3036            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
3037
3038            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
3039                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
3040
3041            final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0],
3042                    mTargetCell[1]);
3043
3044            manageFolderFeedback(info, mDragTargetLayout, mTargetCell,
3045                    targetCellDistance, dragOverView);
3046
3047            int minSpanX = item.spanX;
3048            int minSpanY = item.spanY;
3049            if (item.minSpanX > 0 && item.minSpanY > 0) {
3050                minSpanX = item.minSpanX;
3051                minSpanY = item.minSpanY;
3052            }
3053
3054            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3055                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3056                    item.spanY, child, mTargetCell);
3057
3058            if (!nearestDropOccupied) {
3059                mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3060                        (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3061                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false,
3062                        d.dragView.getDragVisualizeOffset(), d.dragView.getDragRegion());
3063            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3064                    && !mReorderAlarm.alarmPending() && (mLastReorderX != mTargetCell[0] ||
3065                    mLastReorderY != mTargetCell[1])) {
3066
3067                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3068                // reorder, then we schedule a reorder
3069                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3070                        minSpanX, minSpanY, item.spanX, item.spanY, d.dragView, child);
3071                mReorderAlarm.setOnAlarmListener(listener);
3072                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3073            }
3074
3075            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3076                    !nearestDropOccupied) {
3077                if (mDragTargetLayout != null) {
3078                    mDragTargetLayout.revertTempState();
3079                }
3080            }
3081        }
3082    }
3083
3084    private void manageFolderFeedback(ItemInfo info, CellLayout targetLayout,
3085            int[] targetCell, float distance, View dragOverView) {
3086        boolean userFolderPending = willCreateUserFolder(info, targetLayout, targetCell, distance,
3087                false);
3088
3089        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3090                !mFolderCreationAlarm.alarmPending()) {
3091            mFolderCreationAlarm.setOnAlarmListener(new
3092                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]));
3093            mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3094            return;
3095        }
3096
3097        boolean willAddToFolder =
3098                willAddToExistingUserFolder(info, targetLayout, targetCell, distance);
3099
3100        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3101            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3102            mDragOverFolderIcon.onDragEnter(info);
3103            if (targetLayout != null) {
3104                targetLayout.clearDragOutlines();
3105            }
3106            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3107            return;
3108        }
3109
3110        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3111            setDragMode(DRAG_MODE_NONE);
3112        }
3113        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3114            setDragMode(DRAG_MODE_NONE);
3115        }
3116
3117        return;
3118    }
3119
3120    class FolderCreationAlarmListener implements OnAlarmListener {
3121        CellLayout layout;
3122        int cellX;
3123        int cellY;
3124
3125        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3126            this.layout = layout;
3127            this.cellX = cellX;
3128            this.cellY = cellY;
3129        }
3130
3131        public void onAlarm(Alarm alarm) {
3132            if (mDragFolderRingAnimator == null) {
3133                mDragFolderRingAnimator = new FolderRingAnimator(mLauncher, null);
3134            }
3135            mDragFolderRingAnimator.setCell(cellX, cellY);
3136            mDragFolderRingAnimator.setCellLayout(layout);
3137            mDragFolderRingAnimator.animateToAcceptState();
3138            layout.showFolderAccept(mDragFolderRingAnimator);
3139            layout.clearDragOutlines();
3140            setDragMode(DRAG_MODE_CREATE_FOLDER);
3141        }
3142    }
3143
3144    class ReorderAlarmListener implements OnAlarmListener {
3145        float[] dragViewCenter;
3146        int minSpanX, minSpanY, spanX, spanY;
3147        DragView dragView;
3148        View child;
3149
3150        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3151                int spanY, DragView dragView, View child) {
3152            this.dragViewCenter = dragViewCenter;
3153            this.minSpanX = minSpanX;
3154            this.minSpanY = minSpanY;
3155            this.spanX = spanX;
3156            this.spanY = spanY;
3157            this.child = child;
3158            this.dragView = dragView;
3159        }
3160
3161        public void onAlarm(Alarm alarm) {
3162            int[] resultSpan = new int[2];
3163            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3164                    (int) mDragViewVisualCenter[1], spanX, spanY, mDragTargetLayout, mTargetCell);
3165            mLastReorderX = mTargetCell[0];
3166            mLastReorderY = mTargetCell[1];
3167
3168            mTargetCell = mDragTargetLayout.createArea((int) mDragViewVisualCenter[0],
3169                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3170                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3171
3172            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3173                mDragTargetLayout.revertTempState();
3174            } else {
3175                setDragMode(DRAG_MODE_REORDER);
3176            }
3177
3178            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3179            mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3180                (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3181                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize,
3182                dragView.getDragVisualizeOffset(), dragView.getDragRegion());
3183        }
3184    }
3185
3186    @Override
3187    public void getHitRectRelativeToDragLayer(Rect outRect) {
3188        // We want the workspace to have the whole area of the display (it will find the correct
3189        // cell layout to drop to in the existing drag/drop logic.
3190        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3191    }
3192
3193    /**
3194     * Add the item specified by dragInfo to the given layout.
3195     * @return true if successful
3196     */
3197    public boolean addExternalItemToScreen(ItemInfo dragInfo, CellLayout layout) {
3198        if (layout.findCellForSpan(mTempEstimate, dragInfo.spanX, dragInfo.spanY)) {
3199            onDropExternal(dragInfo.dropPos, (ItemInfo) dragInfo, (CellLayout) layout, false);
3200            return true;
3201        }
3202        mLauncher.showOutOfSpaceMessage(mLauncher.isHotseatLayout(layout));
3203        return false;
3204    }
3205
3206    private void onDropExternal(int[] touchXY, Object dragInfo,
3207            CellLayout cellLayout, boolean insertAtFirst) {
3208        onDropExternal(touchXY, dragInfo, cellLayout, insertAtFirst, null);
3209    }
3210
3211    /**
3212     * Drop an item that didn't originate on one of the workspace screens.
3213     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3214     * come from another app altogether.
3215     *
3216     * NOTE: This can also be called when we are outside of a drag event, when we want
3217     * to add an item to one of the workspace screens.
3218     */
3219    private void onDropExternal(final int[] touchXY, final Object dragInfo,
3220            final CellLayout cellLayout, boolean insertAtFirst, DragObject d) {
3221        final Runnable exitSpringLoadedRunnable = new Runnable() {
3222            @Override
3223            public void run() {
3224                mLauncher.exitSpringLoadedDragModeDelayed(true, false, null);
3225            }
3226        };
3227
3228        ItemInfo info = (ItemInfo) dragInfo;
3229        int spanX = info.spanX;
3230        int spanY = info.spanY;
3231        if (mDragInfo != null) {
3232            spanX = mDragInfo.spanX;
3233            spanY = mDragInfo.spanY;
3234        }
3235
3236        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3237                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3238                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3239        final long screenId = getIdForScreen(cellLayout);
3240        if (!mLauncher.isHotseatLayout(cellLayout)
3241                && screenId != getScreenIdForPageIndex(mCurrentPage)
3242                && mState != State.SPRING_LOADED) {
3243            snapToScreenId(screenId, null);
3244        }
3245
3246        if (info instanceof PendingAddItemInfo) {
3247            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo;
3248
3249            boolean findNearestVacantCell = true;
3250            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3251                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3252                        cellLayout, mTargetCell);
3253                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3254                        mDragViewVisualCenter[1], mTargetCell);
3255                if (willCreateUserFolder((ItemInfo) d.dragInfo, cellLayout, mTargetCell,
3256                        distance, true) || willAddToExistingUserFolder((ItemInfo) d.dragInfo,
3257                                cellLayout, mTargetCell, distance)) {
3258                    findNearestVacantCell = false;
3259                }
3260            }
3261
3262            final ItemInfo item = (ItemInfo) d.dragInfo;
3263            boolean updateWidgetSize = false;
3264            if (findNearestVacantCell) {
3265                int minSpanX = item.spanX;
3266                int minSpanY = item.spanY;
3267                if (item.minSpanX > 0 && item.minSpanY > 0) {
3268                    minSpanX = item.minSpanX;
3269                    minSpanY = item.minSpanY;
3270                }
3271                int[] resultSpan = new int[2];
3272                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3273                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3274                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3275
3276                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3277                    updateWidgetSize = true;
3278                }
3279                item.spanX = resultSpan[0];
3280                item.spanY = resultSpan[1];
3281            }
3282
3283            Runnable onAnimationCompleteRunnable = new Runnable() {
3284                @Override
3285                public void run() {
3286                    // When dragging and dropping from customization tray, we deal with creating
3287                    // widgets/shortcuts/folders in a slightly different way
3288                    switch (pendingInfo.itemType) {
3289                    case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
3290                        int span[] = new int[2];
3291                        span[0] = item.spanX;
3292                        span[1] = item.spanY;
3293                        mLauncher.addAppWidgetFromDrop((PendingAddWidgetInfo) pendingInfo,
3294                                container, screenId, mTargetCell, span, null);
3295                        break;
3296                    case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3297                        mLauncher.processShortcutFromDrop(pendingInfo.componentName,
3298                                container, screenId, mTargetCell, null);
3299                        break;
3300                    default:
3301                        throw new IllegalStateException("Unknown item type: " +
3302                                pendingInfo.itemType);
3303                    }
3304                }
3305            };
3306            View finalView = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3307                    ? ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3308
3309            if (finalView instanceof AppWidgetHostView && updateWidgetSize) {
3310                AppWidgetHostView awhv = (AppWidgetHostView) finalView;
3311                AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, item.spanX,
3312                        item.spanY);
3313            }
3314
3315            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3316            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET &&
3317                    ((PendingAddWidgetInfo) pendingInfo).info.configure != null) {
3318                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3319            }
3320            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3321                    animationStyle, finalView, true);
3322        } else {
3323            // This is for other drag/drop cases, like dragging from All Apps
3324            View view = null;
3325
3326            switch (info.itemType) {
3327            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3328            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3329                if (info.container == NO_ID && info instanceof ApplicationInfo) {
3330                    // Came from all apps -- make a copy
3331                    info = new ShortcutInfo((ApplicationInfo) info);
3332                }
3333                view = mLauncher.createShortcut(R.layout.application, cellLayout,
3334                        (ShortcutInfo) info);
3335                break;
3336            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3337                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3338                        (FolderInfo) info, mIconCache);
3339                break;
3340            default:
3341                throw new IllegalStateException("Unknown item type: " + info.itemType);
3342            }
3343
3344            // First we find the cell nearest to point at which the item is
3345            // dropped, without any consideration to whether there is an item there.
3346            if (touchXY != null) {
3347                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3348                        cellLayout, mTargetCell);
3349                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3350                        mDragViewVisualCenter[1], mTargetCell);
3351                d.postAnimationRunnable = exitSpringLoadedRunnable;
3352                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3353                        true, d.dragView, d.postAnimationRunnable)) {
3354                    return;
3355                }
3356                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3357                        true)) {
3358                    return;
3359                }
3360            }
3361
3362            if (touchXY != null) {
3363                // when dragging and dropping, just find the closest free spot
3364                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3365                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3366                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3367            } else {
3368                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3369            }
3370            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1], info.spanX,
3371                    info.spanY, insertAtFirst);
3372            cellLayout.onDropChild(view);
3373            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams();
3374            cellLayout.getShortcutsAndWidgets().measureChild(view);
3375
3376            LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId,
3377                    lp.cellX, lp.cellY);
3378
3379            if (d.dragView != null) {
3380                // We wrap the animation call in the temporary set and reset of the current
3381                // cellLayout to its final transform -- this means we animate the drag view to
3382                // the correct final location.
3383                setFinalTransitionTransform(cellLayout);
3384                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3385                        exitSpringLoadedRunnable);
3386                resetTransitionTransform(cellLayout);
3387            }
3388        }
3389    }
3390
3391    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3392        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo.spanX,
3393                widgetInfo.spanY, widgetInfo, false);
3394        int visibility = layout.getVisibility();
3395        layout.setVisibility(VISIBLE);
3396
3397        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3398        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3399        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3400                Bitmap.Config.ARGB_8888);
3401        Canvas c = new Canvas(b);
3402
3403        layout.measure(width, height);
3404        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3405        layout.draw(c);
3406        c.setBitmap(null);
3407        layout.setVisibility(visibility);
3408        return b;
3409    }
3410
3411    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3412            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell,
3413            boolean external, boolean scale) {
3414        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3415        // location and size on the home screen.
3416        int spanX = info.spanX;
3417        int spanY = info.spanY;
3418
3419        Rect r = estimateItemPosition(layout, info, targetCell[0], targetCell[1], spanX, spanY);
3420        loc[0] = r.left;
3421        loc[1] = r.top;
3422
3423        setFinalTransitionTransform(layout);
3424        float cellLayoutScale =
3425                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3426        resetTransitionTransform(layout);
3427
3428        float dragViewScaleX;
3429        float dragViewScaleY;
3430        if (scale) {
3431            dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3432            dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3433        } else {
3434            dragViewScaleX = 1f;
3435            dragViewScaleY = 1f;
3436        }
3437
3438        // The animation will scale the dragView about its center, so we need to center about
3439        // the final location.
3440        loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2;
3441        loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3442
3443        scaleXY[0] = dragViewScaleX * cellLayoutScale;
3444        scaleXY[1] = dragViewScaleY * cellLayoutScale;
3445    }
3446
3447    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, DragView dragView,
3448            final Runnable onCompleteRunnable, int animationType, final View finalView,
3449            boolean external) {
3450        Rect from = new Rect();
3451        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3452
3453        int[] finalPos = new int[2];
3454        float scaleXY[] = new float[2];
3455        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3456        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3457                external, scalePreview);
3458
3459        Resources res = mLauncher.getResources();
3460        int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3461
3462        // In the case where we've prebound the widget, we remove it from the DragLayer
3463        if (finalView instanceof AppWidgetHostView && external) {
3464            Log.d(TAG, "6557954 Animate widget drop, final view is appWidgetHostView");
3465            mLauncher.getDragLayer().removeView(finalView);
3466        }
3467        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3468            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3469            dragView.setCrossFadeBitmap(crossFadeBitmap);
3470            dragView.crossFade((int) (duration * 0.8f));
3471        } else if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET && external) {
3472            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3473        }
3474
3475        DragLayer dragLayer = mLauncher.getDragLayer();
3476        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3477            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3478                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3479        } else {
3480            int endStyle;
3481            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3482                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3483            } else {
3484                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;;
3485            }
3486
3487            Runnable onComplete = new Runnable() {
3488                @Override
3489                public void run() {
3490                    if (finalView != null) {
3491                        finalView.setVisibility(VISIBLE);
3492                    }
3493                    if (onCompleteRunnable != null) {
3494                        onCompleteRunnable.run();
3495                    }
3496                }
3497            };
3498            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3499                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3500                    duration, this);
3501        }
3502    }
3503
3504    public void setFinalTransitionTransform(CellLayout layout) {
3505        if (isSwitchingState()) {
3506            mCurrentScale = getScaleX();
3507            setScaleX(mNewScale);
3508            setScaleY(mNewScale);
3509        }
3510    }
3511    public void resetTransitionTransform(CellLayout layout) {
3512        if (isSwitchingState()) {
3513            setScaleX(mCurrentScale);
3514            setScaleY(mCurrentScale);
3515        }
3516    }
3517
3518    /**
3519     * Return the current {@link CellLayout}, correctly picking the destination
3520     * screen while a scroll is in progress.
3521     */
3522    public CellLayout getCurrentDropLayout() {
3523        return (CellLayout) getChildAt(getNextPage());
3524    }
3525
3526    /**
3527     * Return the current CellInfo describing our current drag; this method exists
3528     * so that Launcher can sync this object with the correct info when the activity is created/
3529     * destroyed
3530     *
3531     */
3532    public CellLayout.CellInfo getDragInfo() {
3533        return mDragInfo;
3534    }
3535
3536    /**
3537     * Calculate the nearest cell where the given object would be dropped.
3538     *
3539     * pixelX and pixelY should be in the coordinate system of layout
3540     */
3541    private int[] findNearestArea(int pixelX, int pixelY,
3542            int spanX, int spanY, CellLayout layout, int[] recycle) {
3543        return layout.findNearestArea(
3544                pixelX, pixelY, spanX, spanY, recycle);
3545    }
3546
3547    void setup(DragController dragController) {
3548        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3549        mDragController = dragController;
3550
3551        // hardware layers on children are enabled on startup, but should be disabled until
3552        // needed
3553        updateChildrenLayersEnabled(false);
3554        setWallpaperDimension();
3555    }
3556
3557    /**
3558     * Called at the end of a drag which originated on the workspace.
3559     */
3560    public void onDropCompleted(final View target, final DragObject d,
3561            final boolean isFlingToDelete, final boolean success) {
3562        if (mDeferDropAfterUninstall) {
3563            mDeferredAction = new Runnable() {
3564                    public void run() {
3565                        onDropCompleted(target, d, isFlingToDelete, success);
3566                        mDeferredAction = null;
3567                    }
3568                };
3569            return;
3570        }
3571
3572        boolean beingCalledAfterUninstall = mDeferredAction != null;
3573
3574        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3575            if (target != this && mDragInfo != null) {
3576                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
3577                if (mDragInfo.cell instanceof DropTarget) {
3578                    mDragController.removeDropTarget((DropTarget) mDragInfo.cell);
3579                }
3580                // If we move the item to anything not on the Workspace, check if any empty
3581                // screens need to be removed. If we dropped back on the workspace, this will
3582                // be done post drop animation.
3583                stripEmptyScreens();
3584            }
3585        } else if (mDragInfo != null) {
3586            CellLayout cellLayout;
3587            if (mLauncher.isHotseatLayout(target)) {
3588                cellLayout = mLauncher.getHotseat().getLayout();
3589            } else {
3590                cellLayout = getScreenWithId(mDragInfo.screenId);
3591            }
3592            cellLayout.onDropChild(mDragInfo.cell);
3593        }
3594        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3595                && mDragInfo.cell != null) {
3596            mDragInfo.cell.setVisibility(VISIBLE);
3597        }
3598        mDragOutline = null;
3599        mDragInfo = null;
3600    }
3601
3602    public void deferCompleteDropAfterUninstallActivity() {
3603        mDeferDropAfterUninstall = true;
3604    }
3605
3606    /// maybe move this into a smaller part
3607    public void onUninstallActivityReturned(boolean success) {
3608        mDeferDropAfterUninstall = false;
3609        mUninstallSuccessful = success;
3610        if (mDeferredAction != null) {
3611            mDeferredAction.run();
3612        }
3613    }
3614
3615    void updateItemLocationsInDatabase(CellLayout cl) {
3616        int count = cl.getShortcutsAndWidgets().getChildCount();
3617
3618        long screenId = getIdForScreen(cl);
3619        int container = Favorites.CONTAINER_DESKTOP;
3620
3621        if (mLauncher.isHotseatLayout(cl)) {
3622            screenId = -1;
3623            container = Favorites.CONTAINER_HOTSEAT;
3624        }
3625
3626        for (int i = 0; i < count; i++) {
3627            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3628            ItemInfo info = (ItemInfo) v.getTag();
3629            // Null check required as the AllApps button doesn't have an item info
3630            if (info != null && info.requiresDbUpdate) {
3631                info.requiresDbUpdate = false;
3632                LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, info.cellX,
3633                        info.cellY, info.spanX, info.spanY);
3634            }
3635        }
3636    }
3637
3638    ArrayList<ComponentName> stripDuplicateApps() {
3639        ArrayList<ComponentName> uniqueIntents = new ArrayList<ComponentName>();
3640        stripDuplicateApps((CellLayout) mLauncher.getHotseat().getLayout(), uniqueIntents);
3641        int count = getChildCount();
3642        for (int i = 0; i < count; i++) {
3643            CellLayout cl = (CellLayout) getChildAt(i);
3644            stripDuplicateApps(cl, uniqueIntents);
3645        }
3646        return uniqueIntents;
3647    }
3648
3649    void stripDuplicateApps(CellLayout cl, ArrayList<ComponentName> uniqueIntents) {
3650        int count = cl.getShortcutsAndWidgets().getChildCount();
3651
3652        ArrayList<View> children = new ArrayList<View>();
3653        for (int i = 0; i < count; i++) {
3654            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3655            children.add(v);
3656        }
3657
3658        for (int i = 0; i < count; i++) {
3659            View v = children.get(i);
3660            ItemInfo info = (ItemInfo) v.getTag();
3661            // Null check required as the AllApps button doesn't have an item info
3662            if (info instanceof ShortcutInfo) {
3663                ShortcutInfo si = (ShortcutInfo) info;
3664                ComponentName cn = si.intent.getComponent();
3665
3666                if (si.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3667                    continue;
3668                }
3669
3670                if (!uniqueIntents.contains(cn)) {
3671                    uniqueIntents.add(cn);
3672                } else {
3673                    cl.removeViewInLayout(v);
3674                    LauncherModel.deleteItemFromDatabase(mLauncher, si);
3675                }
3676            }
3677            if (v instanceof FolderIcon) {
3678                FolderIcon fi = (FolderIcon) v;
3679                ArrayList<View> items = fi.getFolder().getItemsInReadingOrder();
3680                for (int j = 0; j < items.size(); j++) {
3681                    if (items.get(j).getTag() instanceof ShortcutInfo) {
3682                        ShortcutInfo si = (ShortcutInfo) items.get(j).getTag();
3683                        ComponentName cn = si.intent.getComponent();
3684
3685                        if (si.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3686                            continue;
3687                        }
3688                        if (!uniqueIntents.contains(cn)) {
3689                            uniqueIntents.add(cn);
3690                        } else {
3691                            fi.getFolderInfo().remove(si);
3692                            LauncherModel.deleteItemFromDatabase(mLauncher, si);
3693                        }
3694                    }
3695                }
3696            }
3697        }
3698    }
3699
3700    void saveWorkspaceToDb() {
3701        saveWorkspaceScreenToDb((CellLayout) mLauncher.getHotseat().getLayout());
3702        int count = getChildCount();
3703        for (int i = 0; i < count; i++) {
3704            CellLayout cl = (CellLayout) getChildAt(i);
3705            saveWorkspaceScreenToDb(cl);
3706        }
3707    }
3708
3709    void saveWorkspaceScreenToDb(CellLayout cl) {
3710        int count = cl.getShortcutsAndWidgets().getChildCount();
3711
3712        long screenId = getIdForScreen(cl);
3713        int container = Favorites.CONTAINER_DESKTOP;
3714
3715        Hotseat hotseat = mLauncher.getHotseat();
3716        if (mLauncher.isHotseatLayout(cl)) {
3717            screenId = -1;
3718            container = Favorites.CONTAINER_HOTSEAT;
3719        }
3720
3721        for (int i = 0; i < count; i++) {
3722            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3723            ItemInfo info = (ItemInfo) v.getTag();
3724            // Null check required as the AllApps button doesn't have an item info
3725            if (info != null) {
3726                int cellX = info.cellX;
3727                int cellY = info.cellY;
3728                if (container == Favorites.CONTAINER_HOTSEAT) {
3729                    cellX = hotseat.getCellXFromOrder((int) info.screenId);
3730                    cellY = hotseat.getCellYFromOrder((int) info.screenId);
3731                }
3732                LauncherModel.addItemToDatabase(mLauncher, info, container, screenId, cellX,
3733                        cellY, false);
3734            }
3735            if (v instanceof FolderIcon) {
3736                FolderIcon fi = (FolderIcon) v;
3737                fi.getFolder().addItemLocationsInDatabase();
3738            }
3739        }
3740    }
3741
3742    @Override
3743    public boolean supportsFlingToDelete() {
3744        return true;
3745    }
3746
3747    @Override
3748    public void onFlingToDelete(DragObject d, int x, int y, PointF vec) {
3749        // Do nothing
3750    }
3751
3752    @Override
3753    public void onFlingToDeleteCompleted() {
3754        // Do nothing
3755    }
3756
3757    public boolean isDropEnabled() {
3758        return true;
3759    }
3760
3761    @Override
3762    protected void onRestoreInstanceState(Parcelable state) {
3763        super.onRestoreInstanceState(state);
3764        Launcher.setScreen(mCurrentPage);
3765    }
3766
3767    @Override
3768    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
3769        // We don't dispatch restoreInstanceState to our children using this code path.
3770        // Some pages will be restored immediately as their items are bound immediately, and
3771        // others we will need to wait until after their items are bound.
3772        mSavedStates = container;
3773    }
3774
3775    public void restoreInstanceStateForChild(int child) {
3776        if (mSavedStates != null) {
3777            mRestoredPages.add(child);
3778            CellLayout cl = (CellLayout) getChildAt(child);
3779            cl.restoreInstanceState(mSavedStates);
3780        }
3781    }
3782
3783    public void restoreInstanceStateForRemainingPages() {
3784        int count = getChildCount();
3785        for (int i = 0; i < count; i++) {
3786            if (!mRestoredPages.contains(i)) {
3787                restoreInstanceStateForChild(i);
3788            }
3789        }
3790        mRestoredPages.clear();
3791    }
3792
3793    @Override
3794    public void scrollLeft() {
3795        if (!isSmall() && !mIsSwitchingState) {
3796            super.scrollLeft();
3797        }
3798        Folder openFolder = getOpenFolder();
3799        if (openFolder != null) {
3800            openFolder.completeDragExit();
3801        }
3802    }
3803
3804    @Override
3805    public void scrollRight() {
3806        if (!isSmall() && !mIsSwitchingState) {
3807            super.scrollRight();
3808        }
3809        Folder openFolder = getOpenFolder();
3810        if (openFolder != null) {
3811            openFolder.completeDragExit();
3812        }
3813    }
3814
3815    @Override
3816    public boolean onEnterScrollArea(int x, int y, int direction) {
3817        // Ignore the scroll area if we are dragging over the hot seat
3818        boolean isPortrait = !LauncherAppState.isScreenLandscape(getContext());
3819        if (mLauncher.getHotseat() != null && isPortrait) {
3820            Rect r = new Rect();
3821            mLauncher.getHotseat().getHitRect(r);
3822            if (r.contains(x, y)) {
3823                return false;
3824            }
3825        }
3826
3827        boolean result = false;
3828        if (!isSmall() && !mIsSwitchingState && getOpenFolder() == null) {
3829            mInScrollArea = true;
3830
3831            final int page = getNextPage() +
3832                       (direction == DragController.SCROLL_LEFT ? -1 : 1);
3833            // We always want to exit the current layout to ensure parity of enter / exit
3834            setCurrentDropLayout(null);
3835
3836            if (0 <= page && page < getChildCount()) {
3837                // Ensure that we are not dragging over to the custom content screen
3838                if (getScreenIdForPageIndex(page) == CUSTOM_CONTENT_SCREEN_ID) {
3839                    return false;
3840                }
3841
3842                CellLayout layout = (CellLayout) getChildAt(page);
3843                setCurrentDragOverlappingLayout(layout);
3844
3845                // Workspace is responsible for drawing the edge glow on adjacent pages,
3846                // so we need to redraw the workspace when this may have changed.
3847                invalidate();
3848                result = true;
3849            }
3850        }
3851        return result;
3852    }
3853
3854    @Override
3855    public boolean onExitScrollArea() {
3856        boolean result = false;
3857        if (mInScrollArea) {
3858            invalidate();
3859            CellLayout layout = getCurrentDropLayout();
3860            setCurrentDropLayout(layout);
3861            setCurrentDragOverlappingLayout(layout);
3862
3863            result = true;
3864            mInScrollArea = false;
3865        }
3866        return result;
3867    }
3868
3869    private void onResetScrollArea() {
3870        setCurrentDragOverlappingLayout(null);
3871        mInScrollArea = false;
3872    }
3873
3874    /**
3875     * Returns a specific CellLayout
3876     */
3877    CellLayout getParentCellLayoutForView(View v) {
3878        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
3879        for (CellLayout layout : layouts) {
3880            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
3881                return layout;
3882            }
3883        }
3884        return null;
3885    }
3886
3887    /**
3888     * Returns a list of all the CellLayouts in the workspace.
3889     */
3890    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
3891        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
3892        int screenCount = getChildCount();
3893        for (int screen = 0; screen < screenCount; screen++) {
3894            layouts.add(((CellLayout) getChildAt(screen)));
3895        }
3896        if (mLauncher.getHotseat() != null) {
3897            layouts.add(mLauncher.getHotseat().getLayout());
3898        }
3899        return layouts;
3900    }
3901
3902    /**
3903     * We should only use this to search for specific children.  Do not use this method to modify
3904     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
3905     * the hotseat and workspace pages
3906     */
3907    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
3908        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
3909                new ArrayList<ShortcutAndWidgetContainer>();
3910        int screenCount = getChildCount();
3911        for (int screen = 0; screen < screenCount; screen++) {
3912            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
3913        }
3914        if (mLauncher.getHotseat() != null) {
3915            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
3916        }
3917        return childrenLayouts;
3918    }
3919
3920    public Folder getFolderForTag(Object tag) {
3921        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
3922                getAllShortcutAndWidgetContainers();
3923        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
3924            int count = layout.getChildCount();
3925            for (int i = 0; i < count; i++) {
3926                View child = layout.getChildAt(i);
3927                if (child instanceof Folder) {
3928                    Folder f = (Folder) child;
3929                    if (f.getInfo() == tag && f.getInfo().opened) {
3930                        return f;
3931                    }
3932                }
3933            }
3934        }
3935        return null;
3936    }
3937
3938    public View getViewForTag(Object tag) {
3939        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
3940                getAllShortcutAndWidgetContainers();
3941        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
3942            int count = layout.getChildCount();
3943            for (int i = 0; i < count; i++) {
3944                View child = layout.getChildAt(i);
3945                if (child.getTag() == tag) {
3946                    return child;
3947                }
3948            }
3949        }
3950        return null;
3951    }
3952
3953    void clearDropTargets() {
3954        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
3955                getAllShortcutAndWidgetContainers();
3956        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
3957            int childCount = layout.getChildCount();
3958            for (int j = 0; j < childCount; j++) {
3959                View v = layout.getChildAt(j);
3960                if (v instanceof DropTarget) {
3961                    mDragController.removeDropTarget((DropTarget) v);
3962                }
3963            }
3964        }
3965    }
3966
3967    // Removes ALL items that match a given package name, this is usually called when a package
3968    // has been removed and we want to remove all components (widgets, shortcuts, apps) that
3969    // belong to that package.
3970    void removeItemsByPackageName(final ArrayList<String> packages) {
3971        final HashSet<String> packageNames = new HashSet<String>();
3972        packageNames.addAll(packages);
3973
3974        // Filter out all the ItemInfos that this is going to affect
3975        final HashSet<ItemInfo> infos = new HashSet<ItemInfo>();
3976        final HashSet<ComponentName> cns = new HashSet<ComponentName>();
3977        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
3978        for (CellLayout layoutParent : cellLayouts) {
3979            ViewGroup layout = layoutParent.getShortcutsAndWidgets();
3980            int childCount = layout.getChildCount();
3981            for (int i = 0; i < childCount; ++i) {
3982                View view = layout.getChildAt(i);
3983                infos.add((ItemInfo) view.getTag());
3984            }
3985        }
3986        LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
3987            @Override
3988            public boolean filterItem(ItemInfo parent, ItemInfo info,
3989                                      ComponentName cn) {
3990                if (packageNames.contains(cn.getPackageName())) {
3991                    cns.add(cn);
3992                    return true;
3993                }
3994                return false;
3995            }
3996        };
3997        LauncherModel.filterItemInfos(infos, filter);
3998
3999        // Remove the affected components
4000        removeItemsByComponentName(cns);
4001    }
4002
4003    // Removes items that match the application info specified, when applications are removed
4004    // as a part of an update, this is called to ensure that other widgets and application
4005    // shortcuts are not removed.
4006    void removeItemsByApplicationInfo(final ArrayList<ApplicationInfo> appInfos) {
4007        // Just create a hash table of all the specific components that this will affect
4008        HashSet<ComponentName> cns = new HashSet<ComponentName>();
4009        for (ApplicationInfo info : appInfos) {
4010            cns.add(info.componentName);
4011        }
4012
4013        // Remove all the things
4014        removeItemsByComponentName(cns);
4015    }
4016
4017    void removeItemsByComponentName(final HashSet<ComponentName> componentNames) {
4018        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
4019        for (final CellLayout layoutParent: cellLayouts) {
4020            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
4021
4022            final HashMap<ItemInfo, View> children = new HashMap<ItemInfo, View>();
4023            for (int j = 0; j < layout.getChildCount(); j++) {
4024                final View view = layout.getChildAt(j);
4025                children.put((ItemInfo) view.getTag(), view);
4026            }
4027
4028            final ArrayList<View> childrenToRemove = new ArrayList<View>();
4029            final HashMap<FolderInfo, ArrayList<ShortcutInfo>> folderAppsToRemove =
4030                    new HashMap<FolderInfo, ArrayList<ShortcutInfo>>();
4031            LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
4032                @Override
4033                public boolean filterItem(ItemInfo parent, ItemInfo info,
4034                                          ComponentName cn) {
4035                    if (parent instanceof FolderInfo) {
4036                        if (componentNames.contains(cn)) {
4037                            FolderInfo folder = (FolderInfo) parent;
4038                            ArrayList<ShortcutInfo> appsToRemove;
4039                            if (folderAppsToRemove.containsKey(folder)) {
4040                                appsToRemove = folderAppsToRemove.get(folder);
4041                            } else {
4042                                appsToRemove = new ArrayList<ShortcutInfo>();
4043                                folderAppsToRemove.put(folder, appsToRemove);
4044                            }
4045                            appsToRemove.add((ShortcutInfo) info);
4046                            return true;
4047                        }
4048                    } else {
4049                        if (componentNames.contains(cn)) {
4050                            childrenToRemove.add(children.get(info));
4051                            return true;
4052                        }
4053                    }
4054                    return false;
4055                }
4056            };
4057            LauncherModel.filterItemInfos(children.keySet(), filter);
4058
4059            // Remove all the apps from their folders
4060            for (FolderInfo folder : folderAppsToRemove.keySet()) {
4061                ArrayList<ShortcutInfo> appsToRemove = folderAppsToRemove.get(folder);
4062                for (ShortcutInfo info : appsToRemove) {
4063                    folder.remove(info);
4064                }
4065            }
4066
4067            // Remove all the other children
4068            for (View child : childrenToRemove) {
4069                // Note: We can not remove the view directly from CellLayoutChildren as this
4070                // does not re-mark the spaces as unoccupied.
4071                layoutParent.removeViewInLayout(child);
4072                if (child instanceof DropTarget) {
4073                    mDragController.removeDropTarget((DropTarget) child);
4074                }
4075            }
4076
4077            if (childrenToRemove.size() > 0) {
4078                layout.requestLayout();
4079                layout.invalidate();
4080            }
4081        }
4082
4083        // Strip all the empty screens
4084        stripEmptyScreens();
4085    }
4086
4087    void updateShortcuts(ArrayList<ApplicationInfo> apps) {
4088        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = getAllShortcutAndWidgetContainers();
4089        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4090            int childCount = layout.getChildCount();
4091            for (int j = 0; j < childCount; j++) {
4092                final View view = layout.getChildAt(j);
4093                Object tag = view.getTag();
4094
4095                if (LauncherModel.isShortcutInfoUpdateable((ItemInfo) tag)) {
4096                    ShortcutInfo info = (ShortcutInfo) tag;
4097
4098                    final Intent intent = info.intent;
4099                    final ComponentName name = intent.getComponent();
4100                    final int appCount = apps.size();
4101                    for (int k = 0; k < appCount; k++) {
4102                        ApplicationInfo app = apps.get(k);
4103                        if (app.componentName.equals(name)) {
4104                            BubbleTextView shortcut = (BubbleTextView) view;
4105                            info.updateIcon(mIconCache);
4106                            info.title = app.title.toString();
4107                            shortcut.applyFromShortcutInfo(info, mIconCache);
4108                        }
4109                    }
4110                }
4111            }
4112        }
4113    }
4114
4115    void moveToDefaultScreen(boolean animate) {
4116        if (!isSmall()) {
4117            if (animate) {
4118                snapToPage(mDefaultPage);
4119            } else {
4120                setCurrentPage(mDefaultPage);
4121            }
4122        }
4123        View child = getChildAt(mDefaultPage);
4124        if (child != null) {
4125            child.requestFocus();
4126        }
4127    }
4128
4129    @Override
4130    protected int getPageIndicatorMarker(int pageIndex) {
4131        if (getScreenIdForPageIndex(pageIndex) == CUSTOM_CONTENT_SCREEN_ID) {
4132            return R.layout.now_page_indicator_marker;
4133        }
4134        return super.getPageIndicatorMarker(pageIndex);
4135    }
4136
4137    @Override
4138    public void syncPages() {
4139    }
4140
4141    @Override
4142    public void syncPageItems(int page, boolean immediate) {
4143    }
4144
4145    protected String getCurrentPageDescription() {
4146        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4147        return String.format(getContext().getString(R.string.workspace_scroll_format),
4148                page + 1, getChildCount());
4149    }
4150
4151    public void getLocationInDragLayer(int[] loc) {
4152        mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
4153    }
4154
4155    void setFadeForOverScroll(float fade) {
4156        mOverscrollFade = fade;
4157        float reducedFade = 0.5f + 0.5f * (1 - fade);
4158        final ViewGroup parent = (ViewGroup) getParent();
4159        final ImageView qsbDivider = (ImageView) (parent.findViewById(R.id.qsb_divider));
4160
4161        if (qsbDivider != null) qsbDivider.setAlpha(reducedFade);
4162    }
4163}
4164