Workspace.java revision a45de07ece42b8dac4d5a99326ebf2d4b72ef267 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.launcher3;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.LayoutTransition;
23import android.animation.ObjectAnimator;
24import android.animation.TimeInterpolator;
25import android.animation.ValueAnimator;
26import android.animation.ValueAnimator.AnimatorUpdateListener;
27import android.app.WallpaperManager;
28import android.appwidget.AppWidgetHostView;
29import android.appwidget.AppWidgetProviderInfo;
30import android.content.ComponentName;
31import android.content.Context;
32import android.content.Intent;
33import android.content.SharedPreferences;
34import android.content.res.Resources;
35import android.content.res.TypedArray;
36import android.graphics.Bitmap;
37import android.graphics.Canvas;
38import android.graphics.Matrix;
39import android.graphics.Point;
40import android.graphics.PointF;
41import android.graphics.Rect;
42import android.graphics.Region.Op;
43import android.graphics.drawable.Drawable;
44import android.net.Uri;
45import android.os.IBinder;
46import android.os.Parcelable;
47import android.support.v4.view.ViewCompat;
48import android.util.AttributeSet;
49import android.util.Log;
50import android.util.SparseArray;
51import android.view.Choreographer;
52import android.view.Display;
53import android.view.MotionEvent;
54import android.view.View;
55import android.view.ViewGroup;
56import android.view.View.OnClickListener;
57import android.view.accessibility.AccessibilityEvent;
58import android.view.accessibility.AccessibilityManager;
59import android.view.accessibility.AccessibilityNodeInfo;
60import android.view.animation.DecelerateInterpolator;
61import android.view.animation.Interpolator;
62import android.widget.TextView;
63
64import com.android.launcher3.FolderIcon.FolderRingAnimator;
65import com.android.launcher3.Launcher.CustomContentCallbacks;
66import com.android.launcher3.LauncherSettings.Favorites;
67
68import java.util.ArrayList;
69import java.util.HashMap;
70import java.util.HashSet;
71import java.util.Iterator;
72
73/**
74 * The workspace is a wide area with a wallpaper and a finite number of pages.
75 * Each page contains a number of icons, folders or widgets the user can
76 * interact with. A workspace is meant to be used with a fixed width only.
77 */
78public class Workspace extends SmoothPagedView
79        implements DropTarget, DragSource, DragScroller, View.OnTouchListener,
80        DragController.DragListener, LauncherTransitionable, ViewGroup.OnHierarchyChangeListener,
81        Insettable {
82    private static final String TAG = "Launcher.Workspace";
83
84    // Y rotation to apply to the workspace screens
85    private static final float WORKSPACE_OVERSCROLL_ROTATION = 24f;
86
87    private static final int CHILDREN_OUTLINE_FADE_OUT_DELAY = 0;
88    private static final int CHILDREN_OUTLINE_FADE_OUT_DURATION = 375;
89    private static final int CHILDREN_OUTLINE_FADE_IN_DURATION = 100;
90
91    private static final int BACKGROUND_FADE_OUT_DURATION = 350;
92    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
93    private static final int FLING_THRESHOLD_VELOCITY = 500;
94
95    private static final float ALPHA_CUTOFF_THRESHOLD = 0.01f;
96
97    // These animators are used to fade the children's outlines
98    private ObjectAnimator mChildrenOutlineFadeInAnimation;
99    private ObjectAnimator mChildrenOutlineFadeOutAnimation;
100    private float mChildrenOutlineAlpha = 0;
101
102    // These properties refer to the background protection gradient used for AllApps and Customize
103    private ValueAnimator mBackgroundFadeInAnimation;
104    private ValueAnimator mBackgroundFadeOutAnimation;
105    private Drawable mBackground;
106    boolean mDrawBackground = true;
107    private float mBackgroundAlpha = 0;
108
109    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
110    private long mTouchDownTime = -1;
111    private long mCustomContentShowTime = -1;
112
113    private LayoutTransition mLayoutTransition;
114    private final WallpaperManager mWallpaperManager;
115    private IBinder mWindowToken;
116
117    private int mOriginalDefaultPage;
118    private int mDefaultPage;
119
120    private ShortcutAndWidgetContainer mDragSourceInternal;
121    private static boolean sAccessibilityEnabled;
122
123    // The screen id used for the empty screen always present to the right.
124    private final static long EXTRA_EMPTY_SCREEN_ID = -201;
125    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
126
127    private HashMap<Long, CellLayout> mWorkspaceScreens = new HashMap<Long, CellLayout>();
128    private ArrayList<Long> mScreenOrder = new ArrayList<Long>();
129
130    /**
131     * CellInfo for the cell that is currently being dragged
132     */
133    private CellLayout.CellInfo mDragInfo;
134
135    /**
136     * Target drop area calculated during last acceptDrop call.
137     */
138    private int[] mTargetCell = new int[2];
139    private int mDragOverX = -1;
140    private int mDragOverY = -1;
141
142    static Rect mLandscapeCellLayoutMetrics = null;
143    static Rect mPortraitCellLayoutMetrics = null;
144
145    CustomContentCallbacks mCustomContentCallbacks;
146    boolean mCustomContentShowing;
147    private float mLastCustomContentScrollProgress = -1f;
148    private String mCustomContentDescription = "";
149
150    /**
151     * The CellLayout that is currently being dragged over
152     */
153    private CellLayout mDragTargetLayout = null;
154    /**
155     * The CellLayout that we will show as glowing
156     */
157    private CellLayout mDragOverlappingLayout = null;
158
159    /**
160     * The CellLayout which will be dropped to
161     */
162    private CellLayout mDropToLayout = null;
163
164    private Launcher mLauncher;
165    private IconCache mIconCache;
166    private DragController mDragController;
167
168    // These are temporary variables to prevent having to allocate a new object just to
169    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
170    private int[] mTempCell = new int[2];
171    private int[] mTempPt = new int[2];
172    private int[] mTempEstimate = new int[2];
173    private float[] mDragViewVisualCenter = new float[2];
174    private float[] mTempCellLayoutCenterCoordinates = new float[2];
175    private Matrix mTempInverseMatrix = new Matrix();
176
177    private SpringLoadedDragController mSpringLoadedDragController;
178    private float mSpringLoadedShrinkFactor;
179    private float mOverviewModeShrinkFactor;
180    private int mOverviewModePageOffset;
181
182    // State variable that indicates whether the pages are small (ie when you're
183    // in all apps or customize mode)
184
185    enum State { NORMAL, SPRING_LOADED, SMALL, OVERVIEW};
186    private State mState = State.NORMAL;
187    private boolean mIsSwitchingState = false;
188
189    boolean mAnimatingViewIntoPlace = false;
190    boolean mIsDragOccuring = false;
191    boolean mChildrenLayersEnabled = true;
192
193    private boolean mStripScreensOnPageStopMoving = false;
194
195    /** Is the user is dragging an item near the edge of a page? */
196    private boolean mInScrollArea = false;
197
198    private HolographicOutlineHelper mOutlineHelper;
199    private Bitmap mDragOutline = null;
200    private final Rect mTempRect = new Rect();
201    private final int[] mTempXY = new int[2];
202    private int[] mTempVisiblePagesRange = new int[2];
203    private boolean mOverscrollTransformsSet;
204    private float mLastOverscrollPivotX;
205    public static final int DRAG_BITMAP_PADDING = 2;
206    private boolean mWorkspaceFadeInAdjacentScreens;
207
208    WallpaperOffsetInterpolator mWallpaperOffset;
209    private Runnable mDelayedResizeRunnable;
210    private Runnable mDelayedSnapToPageRunnable;
211    private Point mDisplaySize = new Point();
212    private int mCameraDistance;
213
214    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
215    private static final int FOLDER_CREATION_TIMEOUT = 0;
216    private static final int REORDER_TIMEOUT = 250;
217    private final Alarm mFolderCreationAlarm = new Alarm();
218    private final Alarm mReorderAlarm = new Alarm();
219    private FolderRingAnimator mDragFolderRingAnimator = null;
220    private FolderIcon mDragOverFolderIcon = null;
221    private boolean mCreateUserFolderOnDrop = false;
222    private boolean mAddToExistingFolderOnDrop = false;
223    private DropTarget.DragEnforcer mDragEnforcer;
224    private float mMaxDistanceForFolderCreation;
225
226    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
227    private float mXDown;
228    private float mYDown;
229    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
230    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
231    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
232
233    // Relating to the animation of items being dropped externally
234    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
235    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
236    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
237    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
238    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
239
240    // Related to dragging, folder creation and reordering
241    private static final int DRAG_MODE_NONE = 0;
242    private static final int DRAG_MODE_CREATE_FOLDER = 1;
243    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
244    private static final int DRAG_MODE_REORDER = 3;
245    private int mDragMode = DRAG_MODE_NONE;
246    private int mLastReorderX = -1;
247    private int mLastReorderY = -1;
248
249    private SparseArray<Parcelable> mSavedStates;
250    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
251
252    // These variables are used for storing the initial and final values during workspace animations
253    private int mSavedScrollX;
254    private float mSavedRotationY;
255    private float mSavedTranslationX;
256
257    private float mCurrentScale;
258    private float mNewScale;
259    private float[] mOldBackgroundAlphas;
260    private float[] mOldAlphas;
261    private float[] mNewBackgroundAlphas;
262    private float[] mNewAlphas;
263    private int mLastChildCount = -1;
264    private float mTransitionProgress;
265
266    private Runnable mDeferredAction;
267    private boolean mDeferDropAfterUninstall;
268    private boolean mUninstallSuccessful;
269
270    private final Runnable mBindPages = new Runnable() {
271        @Override
272        public void run() {
273            mLauncher.getModel().bindRemainingSynchronousPages();
274        }
275    };
276
277    /**
278     * Used to inflate the Workspace from XML.
279     *
280     * @param context The application's context.
281     * @param attrs The attributes set containing the Workspace's customization values.
282     */
283    public Workspace(Context context, AttributeSet attrs) {
284        this(context, attrs, 0);
285    }
286
287    /**
288     * Used to inflate the Workspace from XML.
289     *
290     * @param context The application's context.
291     * @param attrs The attributes set containing the Workspace's customization values.
292     * @param defStyle Unused.
293     */
294    public Workspace(Context context, AttributeSet attrs, int defStyle) {
295        super(context, attrs, defStyle);
296        mContentIsRefreshable = false;
297
298        mOutlineHelper = HolographicOutlineHelper.obtain(context);
299
300        mDragEnforcer = new DropTarget.DragEnforcer(context);
301        // With workspace, data is available straight from the get-go
302        setDataIsReady();
303
304        mLauncher = (Launcher) context;
305        final Resources res = getResources();
306        mWorkspaceFadeInAdjacentScreens = res.getBoolean(R.bool.config_workspaceFadeAdjacentScreens);
307        mFadeInAdjacentScreens = false;
308        mWallpaperManager = WallpaperManager.getInstance(context);
309
310        TypedArray a = context.obtainStyledAttributes(attrs,
311                R.styleable.Workspace, defStyle, 0);
312        mSpringLoadedShrinkFactor =
313            res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f;
314        mOverviewModeShrinkFactor =
315                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100.0f;
316        mOverviewModePageOffset = res.getDimensionPixelSize(R.dimen.overview_mode_page_offset);
317        mCameraDistance = res.getInteger(R.integer.config_cameraDistance);
318        mOriginalDefaultPage = mDefaultPage = a.getInt(R.styleable.Workspace_defaultScreen, 1);
319        a.recycle();
320
321        setOnHierarchyChangeListener(this);
322        setHapticFeedbackEnabled(false);
323
324        initWorkspace();
325
326        // Disable multitouch across the workspace/all apps/customize tray
327        setMotionEventSplittingEnabled(true);
328        setImportantForAccessibility(View.IMPORTANT_FOR_ACCESSIBILITY_YES);
329    }
330
331    @Override
332    public void setInsets(Rect insets) {
333        mInsets.set(insets);
334    }
335
336    // estimate the size of a widget with spans hSpan, vSpan. return MAX_VALUE for each
337    // dimension if unsuccessful
338    public int[] estimateItemSize(int hSpan, int vSpan,
339            ItemInfo itemInfo, boolean springLoaded) {
340        int[] size = new int[2];
341        if (getChildCount() > 0) {
342            // Use the first non-custom page to estimate the child position
343            CellLayout cl = (CellLayout) getChildAt(numCustomPages());
344            Rect r = estimateItemPosition(cl, itemInfo, 0, 0, hSpan, vSpan);
345            size[0] = r.width();
346            size[1] = r.height();
347            if (springLoaded) {
348                size[0] *= mSpringLoadedShrinkFactor;
349                size[1] *= mSpringLoadedShrinkFactor;
350            }
351            return size;
352        } else {
353            size[0] = Integer.MAX_VALUE;
354            size[1] = Integer.MAX_VALUE;
355            return size;
356        }
357    }
358
359    public Rect estimateItemPosition(CellLayout cl, ItemInfo pendingInfo,
360            int hCell, int vCell, int hSpan, int vSpan) {
361        Rect r = new Rect();
362        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
363        return r;
364    }
365
366    public void onDragStart(final DragSource source, Object info, int dragAction) {
367        mIsDragOccuring = true;
368        updateChildrenLayersEnabled(false);
369        mLauncher.lockScreenOrientation();
370        mLauncher.onInteractionBegin();
371        setChildrenBackgroundAlphaMultipliers(1f);
372        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
373        InstallShortcutReceiver.enableInstallQueue();
374        UninstallShortcutReceiver.enableUninstallQueue();
375        post(new Runnable() {
376            @Override
377            public void run() {
378                if (mIsDragOccuring) {
379                    addExtraEmptyScreenOnDrag();
380                }
381            }
382        });
383    }
384
385    public void onDragEnd() {
386        mIsDragOccuring = false;
387        updateChildrenLayersEnabled(false);
388        mLauncher.unlockScreenOrientation(false);
389
390        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
391        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
392        UninstallShortcutReceiver.disableAndFlushUninstallQueue(getContext());
393
394        removeExtraEmptyScreen();
395        mDragSourceInternal = null;
396        mLauncher.onInteractionEnd();
397    }
398
399    /**
400     * Initializes various states for this workspace.
401     */
402    protected void initWorkspace() {
403        Context context = getContext();
404        mCurrentPage = mDefaultPage;
405        Launcher.setScreen(mCurrentPage);
406        LauncherAppState app = LauncherAppState.getInstance();
407        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
408        mIconCache = app.getIconCache();
409        setWillNotDraw(false);
410        setClipChildren(false);
411        setClipToPadding(false);
412        setChildrenDrawnWithCacheEnabled(true);
413
414        // This is a bit of a hack to account for the fact that we translate the workspace
415        // up a bit, and still need to draw the background covering the whole screen.
416        setMinScale(mOverviewModeShrinkFactor - 0.2f);
417        setupLayoutTransition();
418
419        final Resources res = getResources();
420        try {
421            mBackground = res.getDrawable(R.drawable.apps_customize_bg);
422        } catch (Resources.NotFoundException e) {
423            // In this case, we will skip drawing background protection
424        }
425
426        mWallpaperOffset = new WallpaperOffsetInterpolator();
427        Display display = mLauncher.getWindowManager().getDefaultDisplay();
428        display.getSize(mDisplaySize);
429
430        mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
431        mFlingThresholdVelocity = (int) (FLING_THRESHOLD_VELOCITY * mDensity);
432    }
433
434    private void setupLayoutTransition() {
435        // We want to show layout transitions when pages are deleted, to close the gap.
436        mLayoutTransition = new LayoutTransition();
437        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
438        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
439        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
440        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
441        setLayoutTransition(mLayoutTransition);
442    }
443
444    @Override
445    protected int getScrollMode() {
446        return SmoothPagedView.X_LARGE_MODE;
447    }
448
449    @Override
450    public void onChildViewAdded(View parent, View child) {
451        if (!(child instanceof CellLayout)) {
452            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
453        }
454        CellLayout cl = ((CellLayout) child);
455        cl.setOnInterceptTouchListener(this);
456        cl.setClickable(true);
457        cl.setImportantForAccessibility(ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO);
458        super.onChildViewAdded(parent, child);
459    }
460
461    protected boolean shouldDrawChild(View child) {
462        final CellLayout cl = (CellLayout) child;
463        return super.shouldDrawChild(child) &&
464            (mIsSwitchingState ||
465             cl.getShortcutsAndWidgets().getAlpha() > 0 ||
466             cl.getBackgroundAlpha() > 0);
467    }
468
469    /**
470     * @return The open folder on the current screen, or null if there is none
471     */
472    Folder getOpenFolder() {
473        DragLayer dragLayer = mLauncher.getDragLayer();
474        int count = dragLayer.getChildCount();
475        for (int i = 0; i < count; i++) {
476            View child = dragLayer.getChildAt(i);
477            if (child instanceof Folder) {
478                Folder folder = (Folder) child;
479                if (folder.getInfo().opened)
480                    return folder;
481            }
482        }
483        return null;
484    }
485
486    boolean isTouchActive() {
487        return mTouchState != TOUCH_STATE_REST;
488    }
489
490    public void removeAllWorkspaceScreens() {
491        // Remove the pages and clear the screen models
492        removeAllViews();
493        mScreenOrder.clear();
494        mWorkspaceScreens.clear();
495    }
496
497    public long insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {
498        // Find the index to insert this view into.  If the empty screen exists, then
499        // insert it before that.
500        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
501        if (insertIndex < 0) {
502            insertIndex = mScreenOrder.size();
503        }
504        return insertNewWorkspaceScreen(screenId, insertIndex);
505    }
506
507    public long insertNewWorkspaceScreen(long screenId) {
508        return insertNewWorkspaceScreen(screenId, getChildCount());
509    }
510
511    public long insertNewWorkspaceScreen(long screenId, int insertIndex) {
512        if (mWorkspaceScreens.containsKey(screenId)) {
513            throw new RuntimeException("Screen id " + screenId + " already exists!");
514        }
515
516        CellLayout newScreen = (CellLayout)
517                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
518
519        newScreen.setOnLongClickListener(mLongClickListener);
520        newScreen.setOnClickListener(mLauncher);
521        newScreen.setSoundEffectsEnabled(false);
522        mWorkspaceScreens.put(screenId, newScreen);
523        mScreenOrder.add(insertIndex, screenId);
524        addView(newScreen, insertIndex);
525        return screenId;
526    }
527
528    public void createCustomContentPage() {
529        CellLayout customScreen = (CellLayout)
530                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, null);
531
532        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
533        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
534
535        // We want no padding on the custom content
536        customScreen.setPadding(0, 0, 0, 0);
537
538        addFullScreenPage(customScreen);
539
540        // Ensure that the current page and default page are maintained.
541        mDefaultPage = mOriginalDefaultPage + 1;
542
543        // Update the custom content hint
544        mLauncher.updateCustomContentHintVisibility();
545        if (mRestorePage != INVALID_RESTORE_PAGE) {
546            mRestorePage = mRestorePage + 1;
547        } else {
548            setCurrentPage(getCurrentPage() + 1);
549        }
550    }
551
552    public void removeCustomContentPage() {
553        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
554        if (customScreen == null) {
555            throw new RuntimeException("Expected custom content screen to exist");
556        }
557
558        mWorkspaceScreens.remove(CUSTOM_CONTENT_SCREEN_ID);
559        mScreenOrder.remove(CUSTOM_CONTENT_SCREEN_ID);
560        removeView(customScreen);
561
562        if (mCustomContentCallbacks != null) {
563            mCustomContentCallbacks.onScrollProgressChanged(0);
564            mCustomContentCallbacks.onHide();
565        }
566
567        mCustomContentCallbacks = null;
568
569        // Ensure that the current page and default page are maintained.
570        mDefaultPage = mOriginalDefaultPage - 1;
571
572        // Update the custom content hint
573        mLauncher.updateCustomContentHintVisibility();
574        if (mRestorePage != INVALID_RESTORE_PAGE) {
575            mRestorePage = mRestorePage - 1;
576        } else {
577            setCurrentPage(getCurrentPage() - 1);
578        }
579    }
580
581    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks,
582            String description) {
583        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
584            throw new RuntimeException("Expected custom content screen to exist");
585        }
586
587        // Add the custom content to the full screen custom page
588        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
589        int spanX = customScreen.getCountX();
590        int spanY = customScreen.getCountY();
591        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
592        lp.canReorder  = false;
593        lp.isFullscreen = true;
594        if (customContent instanceof Insettable) {
595            ((Insettable)customContent).setInsets(mInsets);
596        }
597        customScreen.removeAllViews();
598        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
599        mCustomContentDescription = description;
600
601        mCustomContentCallbacks = callbacks;
602    }
603
604    public void addExtraEmptyScreenOnDrag() {
605        boolean lastChildOnScreen = false;
606        boolean childOnFinalScreen = false;
607
608        if (mDragSourceInternal != null) {
609            if (mDragSourceInternal.getChildCount() == 1) {
610                lastChildOnScreen = true;
611            }
612            CellLayout cl = (CellLayout) mDragSourceInternal.getParent();
613            if (indexOfChild(cl) == getChildCount() - 1) {
614                childOnFinalScreen = true;
615            }
616        }
617
618        // If this is the last item on the final screen
619        if (lastChildOnScreen && childOnFinalScreen) {
620            return;
621        }
622        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
623            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
624        }
625    }
626
627    public boolean addExtraEmptyScreen() {
628        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
629            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
630            return true;
631        }
632        return false;
633    }
634
635    public void removeExtraEmptyScreen() {
636        if (hasExtraEmptyScreen()) {
637            CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
638            mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
639            mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
640            removeView(cl);
641        }
642    }
643
644    public boolean hasExtraEmptyScreen() {
645        int nScreens = getChildCount();
646        nScreens = nScreens - numCustomPages();
647        return mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID) && nScreens > 1;
648    }
649
650    public long commitExtraEmptyScreen() {
651        int index = getPageIndexForScreenId(EXTRA_EMPTY_SCREEN_ID);
652        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
653        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
654        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
655
656        long newId = LauncherAppState.getLauncherProvider().generateNewScreenId();
657        mWorkspaceScreens.put(newId, cl);
658        mScreenOrder.add(newId);
659
660        // Update the page indicator marker
661        if (getPageIndicator() != null) {
662            getPageIndicator().updateMarker(index, getPageIndicatorMarker(index));
663        }
664
665        // Update the model for the new screen
666        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
667
668        return newId;
669    }
670
671    public CellLayout getScreenWithId(long screenId) {
672        CellLayout layout = mWorkspaceScreens.get(screenId);
673        return layout;
674    }
675
676    public long getIdForScreen(CellLayout layout) {
677        Iterator<Long> iter = mWorkspaceScreens.keySet().iterator();
678        while (iter.hasNext()) {
679            long id = iter.next();
680            if (mWorkspaceScreens.get(id) == layout) {
681                return id;
682            }
683        }
684        return -1;
685    }
686
687    public int getPageIndexForScreenId(long screenId) {
688        return indexOfChild(mWorkspaceScreens.get(screenId));
689    }
690
691    public long getScreenIdForPageIndex(int index) {
692        if (0 <= index && index < mScreenOrder.size()) {
693            return mScreenOrder.get(index);
694        }
695        return -1;
696    }
697
698    ArrayList<Long> getScreenOrder() {
699        return mScreenOrder;
700    }
701
702    public void stripEmptyScreens() {
703        if (isPageMoving()) {
704            mStripScreensOnPageStopMoving = true;
705            return;
706        }
707
708        int currentPage = getNextPage();
709        ArrayList<Long> removeScreens = new ArrayList<Long>();
710        for (Long id: mWorkspaceScreens.keySet()) {
711            CellLayout cl = mWorkspaceScreens.get(id);
712            if (id >= 0 && cl.getShortcutsAndWidgets().getChildCount() == 0) {
713                removeScreens.add(id);
714            }
715        }
716
717        // We enforce at least one page to add new items to. In the case that we remove the last
718        // such screen, we convert the last screen to the empty screen
719        int minScreens = 1 + numCustomPages();
720
721        int pageShift = 0;
722        for (Long id: removeScreens) {
723            CellLayout cl = mWorkspaceScreens.get(id);
724            mWorkspaceScreens.remove(id);
725            mScreenOrder.remove(id);
726
727            if (getChildCount() > minScreens) {
728                if (indexOfChild(cl) < currentPage) {
729                    pageShift++;
730                }
731                removeView(cl);
732            } else {
733                // if this is the last non-custom content screen, convert it to the empty screen
734                mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, cl);
735                mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
736            }
737        }
738
739        if (!removeScreens.isEmpty()) {
740            // Update the model if we have changed any screens
741            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
742        }
743
744        if (pageShift >= 0) {
745            setCurrentPage(currentPage - pageShift);
746        }
747    }
748
749    // See implementation for parameter definition.
750    void addInScreen(View child, long container, long screenId,
751            int x, int y, int spanX, int spanY) {
752        addInScreen(child, container, screenId, x, y, spanX, spanY, false, false);
753    }
754
755    // At bind time, we use the rank (screenId) to compute x and y for hotseat items.
756    // See implementation for parameter definition.
757    void addInScreenFromBind(View child, long container, long screenId, int x, int y,
758            int spanX, int spanY) {
759        addInScreen(child, container, screenId, x, y, spanX, spanY, false, true);
760    }
761
762    // See implementation for parameter definition.
763    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
764            boolean insert) {
765        addInScreen(child, container, screenId, x, y, spanX, spanY, insert, false);
766    }
767
768    /**
769     * Adds the specified child in the specified screen. The position and dimension of
770     * the child are defined by x, y, spanX and spanY.
771     *
772     * @param child The child to add in one of the workspace's screens.
773     * @param screenId The screen in which to add the child.
774     * @param x The X position of the child in the screen's grid.
775     * @param y The Y position of the child in the screen's grid.
776     * @param spanX The number of cells spanned horizontally by the child.
777     * @param spanY The number of cells spanned vertically by the child.
778     * @param insert When true, the child is inserted at the beginning of the children list.
779     * @param computeXYFromRank When true, we use the rank (stored in screenId) to compute
780     *                          the x and y position in which to place hotseat items. Otherwise
781     *                          we use the x and y position to compute the rank.
782     */
783    void addInScreen(View child, long container, long screenId, int x, int y, int spanX, int spanY,
784            boolean insert, boolean computeXYFromRank) {
785        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
786            if (getScreenWithId(screenId) == null) {
787                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
788                // DEBUGGING - Print out the stack trace to see where we are adding from
789                new Throwable().printStackTrace();
790                return;
791            }
792        }
793        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
794            // This should never happen
795            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
796        }
797
798        final CellLayout layout;
799        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
800            layout = mLauncher.getHotseat().getLayout();
801            child.setOnKeyListener(null);
802
803            // Hide folder title in the hotseat
804            if (child instanceof FolderIcon) {
805                ((FolderIcon) child).setTextVisible(false);
806            }
807
808            if (computeXYFromRank) {
809                x = mLauncher.getHotseat().getCellXFromOrder((int) screenId);
810                y = mLauncher.getHotseat().getCellYFromOrder((int) screenId);
811            } else {
812                screenId = mLauncher.getHotseat().getOrderInHotseat(x, y);
813            }
814        } else {
815            // Show folder title if not in the hotseat
816            if (child instanceof FolderIcon) {
817                ((FolderIcon) child).setTextVisible(true);
818            }
819            layout = getScreenWithId(screenId);
820            child.setOnKeyListener(new IconKeyEventListener());
821        }
822
823        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
824        CellLayout.LayoutParams lp;
825        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
826            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
827        } else {
828            lp = (CellLayout.LayoutParams) genericLp;
829            lp.cellX = x;
830            lp.cellY = y;
831            lp.cellHSpan = spanX;
832            lp.cellVSpan = spanY;
833        }
834
835        if (spanX < 0 && spanY < 0) {
836            lp.isLockedToGrid = false;
837        }
838
839        // Get the canonical child id to uniquely represent this view in this screen
840        int childId = LauncherModel.getCellLayoutChildId(container, screenId, x, y, spanX, spanY);
841        boolean markCellsAsOccupied = !(child instanceof Folder);
842        if (!layout.addViewToCellLayout(child, insert ? 0 : -1, childId, lp, markCellsAsOccupied)) {
843            // TODO: This branch occurs when the workspace is adding views
844            // outside of the defined grid
845            // maybe we should be deleting these items from the LauncherModel?
846            Launcher.addDumpLog(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout", true);
847        }
848
849        if (!(child instanceof Folder)) {
850            child.setHapticFeedbackEnabled(false);
851            child.setOnLongClickListener(mLongClickListener);
852        }
853        if (child instanceof DropTarget) {
854            mDragController.addDropTarget((DropTarget) child);
855        }
856    }
857
858    /**
859     * Called directly from a CellLayout (not by the framework), after we've been added as a
860     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
861     * that it should intercept touch events, which is not something that is normally supported.
862     */
863    @Override
864    public boolean onTouch(View v, MotionEvent event) {
865        return (isSmall() || !isFinishedSwitchingState())
866                || (!isSmall() && indexOfChild(v) != mCurrentPage);
867    }
868
869    public boolean isSwitchingState() {
870        return mIsSwitchingState;
871    }
872
873    /** This differs from isSwitchingState in that we take into account how far the transition
874     *  has completed. */
875    public boolean isFinishedSwitchingState() {
876        return !mIsSwitchingState || (mTransitionProgress > 0.5f);
877    }
878
879    protected void onWindowVisibilityChanged (int visibility) {
880        mLauncher.onWindowVisibilityChanged(visibility);
881    }
882
883    @Override
884    public boolean dispatchUnhandledMove(View focused, int direction) {
885        if (isSmall() || !isFinishedSwitchingState()) {
886            // when the home screens are shrunken, shouldn't allow side-scrolling
887            return false;
888        }
889        return super.dispatchUnhandledMove(focused, direction);
890    }
891
892    @Override
893    public boolean onInterceptTouchEvent(MotionEvent ev) {
894        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
895        case MotionEvent.ACTION_DOWN:
896            mXDown = ev.getX();
897            mYDown = ev.getY();
898            mTouchDownTime = System.currentTimeMillis();
899            break;
900        case MotionEvent.ACTION_POINTER_UP:
901        case MotionEvent.ACTION_UP:
902            if (mTouchState == TOUCH_STATE_REST) {
903                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
904                if (!currentPage.lastDownOnOccupiedCell()) {
905                    onWallpaperTap(ev);
906                }
907            }
908        }
909        return super.onInterceptTouchEvent(ev);
910    }
911
912    protected void reinflateWidgetsIfNecessary() {
913        final int clCount = getChildCount();
914        for (int i = 0; i < clCount; i++) {
915            CellLayout cl = (CellLayout) getChildAt(i);
916            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
917            final int itemCount = swc.getChildCount();
918            for (int j = 0; j < itemCount; j++) {
919                View v = swc.getChildAt(j);
920
921                if (v.getTag() instanceof LauncherAppWidgetInfo) {
922                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
923                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) info.hostView;
924                    if (lahv != null && lahv.orientationChangedSincedInflation()) {
925                        mLauncher.removeAppWidget(info);
926                        // Remove the current widget which is inflated with the wrong orientation
927                        cl.removeView(lahv);
928                        mLauncher.bindAppWidget(info);
929                    }
930                }
931            }
932        }
933    }
934
935    @Override
936    protected void determineScrollingStart(MotionEvent ev) {
937        if (!isFinishedSwitchingState()) return;
938
939        float deltaX = ev.getX() - mXDown;
940        float absDeltaX = Math.abs(deltaX);
941        float absDeltaY = Math.abs(ev.getY() - mYDown);
942
943        if (Float.compare(absDeltaX, 0f) == 0) return;
944
945        float slope = absDeltaY / absDeltaX;
946        float theta = (float) Math.atan(slope);
947
948        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
949            cancelCurrentPageLongPress();
950        }
951
952        boolean passRightSwipesToCustomContent =
953                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
954
955        boolean swipeInIgnoreDirection = isLayoutRtl() ? deltaX < 0 : deltaX > 0;
956        if (swipeInIgnoreDirection && getScreenIdForPageIndex(getCurrentPage()) ==
957                CUSTOM_CONTENT_SCREEN_ID && passRightSwipesToCustomContent) {
958            // Pass swipes to the right to the custom content page.
959            return;
960        }
961
962        if (theta > MAX_SWIPE_ANGLE) {
963            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
964            return;
965        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
966            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
967            // increase the touch slop to make it harder to begin scrolling the workspace. This
968            // results in vertically scrolling widgets to more easily. The higher the angle, the
969            // more we increase touch slop.
970            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
971            float extraRatio = (float)
972                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
973            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
974        } else {
975            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
976            super.determineScrollingStart(ev);
977        }
978    }
979
980    protected void onPageBeginMoving() {
981        super.onPageBeginMoving();
982
983        if (isHardwareAccelerated()) {
984            updateChildrenLayersEnabled(false);
985        } else {
986            if (mNextPage != INVALID_PAGE) {
987                // we're snapping to a particular screen
988                enableChildrenCache(mCurrentPage, mNextPage);
989            } else {
990                // this is when user is actively dragging a particular screen, they might
991                // swipe it either left or right (but we won't advance by more than one screen)
992                enableChildrenCache(mCurrentPage - 1, mCurrentPage + 1);
993            }
994        }
995
996        // Only show page outlines as we pan if we are on large screen
997        if (LauncherAppState.getInstance().isScreenLarge()) {
998            showOutlines();
999        }
1000
1001        // If we are not fading in adjacent screens, we still need to restore the alpha in case the
1002        // user scrolls while we are transitioning (should not affect dispatchDraw optimizations)
1003        if (!mWorkspaceFadeInAdjacentScreens) {
1004            for (int i = 0; i < getChildCount(); ++i) {
1005                ((CellLayout) getPageAt(i)).setShortcutAndWidgetAlpha(1f);
1006            }
1007        }
1008    }
1009
1010    protected void onPageEndMoving() {
1011        super.onPageEndMoving();
1012
1013        if (isHardwareAccelerated()) {
1014            updateChildrenLayersEnabled(false);
1015        } else {
1016            clearChildrenCache();
1017        }
1018
1019        if (mDragController.isDragging()) {
1020            if (isSmall()) {
1021                // If we are in springloaded mode, then force an event to check if the current touch
1022                // is under a new page (to scroll to)
1023                mDragController.forceTouchMove();
1024            }
1025        } else {
1026            // If we are not mid-dragging, hide the page outlines if we are on a large screen
1027            if (LauncherAppState.getInstance().isScreenLarge()) {
1028                hideOutlines();
1029            }
1030        }
1031
1032        if (mDelayedResizeRunnable != null) {
1033            mDelayedResizeRunnable.run();
1034            mDelayedResizeRunnable = null;
1035        }
1036
1037        if (mDelayedSnapToPageRunnable != null) {
1038            mDelayedSnapToPageRunnable.run();
1039            mDelayedSnapToPageRunnable = null;
1040        }
1041        if (mStripScreensOnPageStopMoving) {
1042            stripEmptyScreens();
1043            mStripScreensOnPageStopMoving = false;
1044        }
1045    }
1046
1047    @Override
1048    protected void notifyPageSwitchListener() {
1049        super.notifyPageSwitchListener();
1050        Launcher.setScreen(mCurrentPage);
1051
1052        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
1053            mCustomContentShowing = true;
1054            if (mCustomContentCallbacks != null) {
1055                mCustomContentCallbacks.onShow();
1056                mCustomContentShowTime = System.currentTimeMillis();
1057                mLauncher.updateVoiceButtonProxyVisible(false);
1058            }
1059        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
1060            mCustomContentShowing = false;
1061            if (mCustomContentCallbacks != null) {
1062                mCustomContentCallbacks.onHide();
1063                mLauncher.resetQSBScroll();
1064                mLauncher.updateVoiceButtonProxyVisible(false);
1065            }
1066        }
1067        if (getPageIndicator() != null) {
1068            getPageIndicator().setContentDescription(getPageIndicatorDescription());
1069        }
1070    }
1071
1072    protected CustomContentCallbacks getCustomContentCallbacks() {
1073        return mCustomContentCallbacks;
1074    }
1075
1076    protected void setWallpaperDimension() {
1077        String spKey = WallpaperCropActivity.getSharedPreferencesKey();
1078        SharedPreferences sp = mLauncher.getSharedPreferences(spKey, Context.MODE_PRIVATE);
1079        WallpaperPickerActivity.suggestWallpaperDimension(mLauncher.getResources(),
1080                sp, mLauncher.getWindowManager(), mWallpaperManager);
1081    }
1082
1083    protected void snapToPage(int whichPage, Runnable r) {
1084        if (mDelayedSnapToPageRunnable != null) {
1085            mDelayedSnapToPageRunnable.run();
1086        }
1087        mDelayedSnapToPageRunnable = r;
1088        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION);
1089    }
1090
1091    protected void snapToScreenId(long screenId, Runnable r) {
1092        snapToPage(getPageIndexForScreenId(screenId), r);
1093    }
1094
1095    class WallpaperOffsetInterpolator implements Choreographer.FrameCallback {
1096        float mFinalOffset = 0.0f;
1097        float mCurrentOffset = 0.5f; // to force an initial update
1098        boolean mWaitingForUpdate;
1099        Choreographer mChoreographer;
1100        Interpolator mInterpolator;
1101        boolean mAnimating;
1102        long mAnimationStartTime;
1103        float mAnimationStartOffset;
1104        private final int ANIMATION_DURATION = 250;
1105        // Don't use all the wallpaper for parallax until you have at least this many pages
1106        private final int MIN_PARALLAX_PAGE_SPAN = 3;
1107        int mNumScreens;
1108
1109        public WallpaperOffsetInterpolator() {
1110            mChoreographer = Choreographer.getInstance();
1111            mInterpolator = new DecelerateInterpolator(1.5f);
1112        }
1113
1114        @Override
1115        public void doFrame(long frameTimeNanos) {
1116            updateOffset(false);
1117        }
1118
1119        private void updateOffset(boolean force) {
1120            if (mWaitingForUpdate || force) {
1121                mWaitingForUpdate = false;
1122                if (computeScrollOffset() && mWindowToken != null) {
1123                    try {
1124                        mWallpaperManager.setWallpaperOffsets(mWindowToken,
1125                                mWallpaperOffset.getCurrX(), 0.5f);
1126                        setWallpaperOffsetSteps();
1127                    } catch (IllegalArgumentException e) {
1128                        Log.e(TAG, "Error updating wallpaper offset: " + e);
1129                    }
1130                }
1131            }
1132        }
1133
1134        public boolean computeScrollOffset() {
1135            final float oldOffset = mCurrentOffset;
1136            if (mAnimating) {
1137                long durationSinceAnimation = System.currentTimeMillis() - mAnimationStartTime;
1138                float t0 = durationSinceAnimation / (float) ANIMATION_DURATION;
1139                float t1 = mInterpolator.getInterpolation(t0);
1140                mCurrentOffset = mAnimationStartOffset +
1141                        (mFinalOffset - mAnimationStartOffset) * t1;
1142                mAnimating = durationSinceAnimation < ANIMATION_DURATION;
1143            } else {
1144                mCurrentOffset = mFinalOffset;
1145            }
1146
1147            if (Math.abs(mCurrentOffset - mFinalOffset) > 0.0000001f) {
1148                scheduleUpdate();
1149            }
1150            if (Math.abs(oldOffset - mCurrentOffset) > 0.0000001f) {
1151                return true;
1152            }
1153            return false;
1154        }
1155
1156        private float wallpaperOffsetForCurrentScroll() {
1157            if (getChildCount() <= 1) {
1158                return 0;
1159            }
1160
1161            // Exclude the leftmost page
1162            int emptyExtraPages = numEmptyScreensToIgnore();
1163            int firstIndex = numCustomPages();
1164            // Exclude the last extra empty screen (if we have > MIN_PARALLAX_PAGE_SPAN pages)
1165            int lastIndex = getChildCount() - 1 - emptyExtraPages;
1166            if (isLayoutRtl()) {
1167                int temp = firstIndex;
1168                firstIndex = lastIndex;
1169                lastIndex = temp;
1170            }
1171
1172            int firstPageScrollX = getScrollForPage(firstIndex);
1173            int scrollRange = getScrollForPage(lastIndex) - firstPageScrollX;
1174            if (scrollRange == 0) {
1175                return 0;
1176            } else {
1177                // TODO: do different behavior if it's  a live wallpaper?
1178                // Sometimes the left parameter of the pages is animated during a layout transition;
1179                // this parameter offsets it to keep the wallpaper from animating as well
1180                int offsetForLayoutTransitionAnimation = isLayoutRtl() ?
1181                        getPageAt(getChildCount() - 1).getLeft() - getFirstChildLeft() : 0;
1182                int adjustedScroll =
1183                        getScrollX() - firstPageScrollX - offsetForLayoutTransitionAnimation;
1184                float offset = Math.min(1, adjustedScroll / (float) scrollRange);
1185                offset = Math.max(0, offset);
1186                // Don't use up all the wallpaper parallax until you have at least
1187                // MIN_PARALLAX_PAGE_SPAN pages
1188                int numScrollingPages = getNumScreensExcludingEmptyAndCustom();
1189                int parallaxPageSpan = Math.max(MIN_PARALLAX_PAGE_SPAN, numScrollingPages - 1);
1190                // On RTL devices, push the wallpaper offset to the right if we don't have enough
1191                // pages (ie if numScrollingPages < MIN_PARALLAX_PAGE_SPAN)
1192                int padding = isLayoutRtl() ? parallaxPageSpan - numScrollingPages + 1 : 0;
1193                return offset * (padding + numScrollingPages - 1) / parallaxPageSpan;
1194            }
1195        }
1196
1197        private int numEmptyScreensToIgnore() {
1198            int numScrollingPages = getChildCount() - numCustomPages();
1199            if (numScrollingPages >= MIN_PARALLAX_PAGE_SPAN && hasExtraEmptyScreen()) {
1200                return 1;
1201            } else {
1202                return 0;
1203            }
1204        }
1205
1206        private int getNumScreensExcludingEmptyAndCustom() {
1207            int numScrollingPages = getChildCount() - numEmptyScreensToIgnore() - numCustomPages();
1208            return numScrollingPages;
1209        }
1210
1211        public void syncWithScroll() {
1212            float offset = wallpaperOffsetForCurrentScroll();
1213            mWallpaperOffset.setFinalX(offset);
1214            updateOffset(true);
1215        }
1216
1217        public float getCurrX() {
1218            return mCurrentOffset;
1219        }
1220
1221        public float getFinalX() {
1222            return mFinalOffset;
1223        }
1224
1225        private void animateToFinal() {
1226            mAnimating = true;
1227            mAnimationStartOffset = mCurrentOffset;
1228            mAnimationStartTime = System.currentTimeMillis();
1229        }
1230
1231        private void setWallpaperOffsetSteps() {
1232            // Set wallpaper offset steps (1 / (number of screens - 1))
1233            mWallpaperManager.setWallpaperOffsetSteps(1.0f / (getChildCount() - 1), 1.0f);
1234        }
1235
1236        public void setFinalX(float x) {
1237            scheduleUpdate();
1238            mFinalOffset = Math.max(0f, Math.min(x, 1.0f));
1239            if (getNumScreensExcludingEmptyAndCustom() != mNumScreens) {
1240                if (mNumScreens > 0) {
1241                    // Don't animate if we're going from 0 screens
1242                    animateToFinal();
1243                }
1244                mNumScreens = getNumScreensExcludingEmptyAndCustom();
1245            }
1246        }
1247
1248        private void scheduleUpdate() {
1249            if (!mWaitingForUpdate) {
1250                mChoreographer.postFrameCallback(this);
1251                mWaitingForUpdate = true;
1252            }
1253        }
1254
1255        public void jumpToFinal() {
1256            mCurrentOffset = mFinalOffset;
1257        }
1258    }
1259
1260    @Override
1261    public void computeScroll() {
1262        super.computeScroll();
1263        mWallpaperOffset.syncWithScroll();
1264    }
1265
1266    void showOutlines() {
1267        if (!isSmall() && !mIsSwitchingState) {
1268            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1269            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1270            mChildrenOutlineFadeInAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 1.0f);
1271            mChildrenOutlineFadeInAnimation.setDuration(CHILDREN_OUTLINE_FADE_IN_DURATION);
1272            mChildrenOutlineFadeInAnimation.start();
1273        }
1274    }
1275
1276    void hideOutlines() {
1277        if (!isSmall() && !mIsSwitchingState) {
1278            if (mChildrenOutlineFadeInAnimation != null) mChildrenOutlineFadeInAnimation.cancel();
1279            if (mChildrenOutlineFadeOutAnimation != null) mChildrenOutlineFadeOutAnimation.cancel();
1280            mChildrenOutlineFadeOutAnimation = LauncherAnimUtils.ofFloat(this, "childrenOutlineAlpha", 0.0f);
1281            mChildrenOutlineFadeOutAnimation.setDuration(CHILDREN_OUTLINE_FADE_OUT_DURATION);
1282            mChildrenOutlineFadeOutAnimation.setStartDelay(CHILDREN_OUTLINE_FADE_OUT_DELAY);
1283            mChildrenOutlineFadeOutAnimation.start();
1284        }
1285    }
1286
1287    public void showOutlinesTemporarily() {
1288        if (!mIsPageMoving && !isTouchActive()) {
1289            snapToPage(mCurrentPage);
1290        }
1291    }
1292
1293    public void setChildrenOutlineAlpha(float alpha) {
1294        mChildrenOutlineAlpha = alpha;
1295        for (int i = 0; i < getChildCount(); i++) {
1296            CellLayout cl = (CellLayout) getChildAt(i);
1297            cl.setBackgroundAlpha(alpha);
1298        }
1299    }
1300
1301    public float getChildrenOutlineAlpha() {
1302        return mChildrenOutlineAlpha;
1303    }
1304
1305    void disableBackground() {
1306        mDrawBackground = false;
1307    }
1308    void enableBackground() {
1309        mDrawBackground = true;
1310    }
1311
1312    private void animateBackgroundGradient(float finalAlpha, boolean animated) {
1313        if (mBackground == null) return;
1314        if (mBackgroundFadeInAnimation != null) {
1315            mBackgroundFadeInAnimation.cancel();
1316            mBackgroundFadeInAnimation = null;
1317        }
1318        if (mBackgroundFadeOutAnimation != null) {
1319            mBackgroundFadeOutAnimation.cancel();
1320            mBackgroundFadeOutAnimation = null;
1321        }
1322        float startAlpha = getBackgroundAlpha();
1323        if (finalAlpha != startAlpha) {
1324            if (animated) {
1325                mBackgroundFadeOutAnimation =
1326                        LauncherAnimUtils.ofFloat(this, startAlpha, finalAlpha);
1327                mBackgroundFadeOutAnimation.addUpdateListener(new AnimatorUpdateListener() {
1328                    public void onAnimationUpdate(ValueAnimator animation) {
1329                        setBackgroundAlpha(((Float) animation.getAnimatedValue()).floatValue());
1330                    }
1331                });
1332                mBackgroundFadeOutAnimation.setInterpolator(new DecelerateInterpolator(1.5f));
1333                mBackgroundFadeOutAnimation.setDuration(BACKGROUND_FADE_OUT_DURATION);
1334                mBackgroundFadeOutAnimation.start();
1335            } else {
1336                setBackgroundAlpha(finalAlpha);
1337            }
1338        }
1339    }
1340
1341    public void setBackgroundAlpha(float alpha) {
1342        if (alpha != mBackgroundAlpha) {
1343            mBackgroundAlpha = alpha;
1344            invalidate();
1345        }
1346    }
1347
1348    public float getBackgroundAlpha() {
1349        return mBackgroundAlpha;
1350    }
1351
1352    float backgroundAlphaInterpolator(float r) {
1353        float pivotA = 0.1f;
1354        float pivotB = 0.4f;
1355        if (r < pivotA) {
1356            return 0;
1357        } else if (r > pivotB) {
1358            return 1.0f;
1359        } else {
1360            return (r - pivotA)/(pivotB - pivotA);
1361        }
1362    }
1363
1364    private void updatePageAlphaValues(int screenCenter) {
1365        boolean isInOverscroll = mOverScrollX < 0 || mOverScrollX > mMaxScrollX;
1366        if (mWorkspaceFadeInAdjacentScreens &&
1367                mState == State.NORMAL &&
1368                !mIsSwitchingState &&
1369                !isInOverscroll) {
1370            for (int i = 0; i < getChildCount(); i++) {
1371                CellLayout child = (CellLayout) getChildAt(i);
1372                if (child != null) {
1373                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1374                    float alpha = 1 - Math.abs(scrollProgress);
1375                    child.getShortcutsAndWidgets().setAlpha(alpha);
1376                    if (!mIsDragOccuring) {
1377                        child.setBackgroundAlphaMultiplier(
1378                                backgroundAlphaInterpolator(Math.abs(scrollProgress)));
1379                    } else {
1380                        child.setBackgroundAlphaMultiplier(1f);
1381                    }
1382                }
1383            }
1384        }
1385    }
1386
1387    private void setChildrenBackgroundAlphaMultipliers(float a) {
1388        for (int i = 0; i < getChildCount(); i++) {
1389            CellLayout child = (CellLayout) getChildAt(i);
1390            child.setBackgroundAlphaMultiplier(a);
1391        }
1392    }
1393
1394    public boolean hasCustomContent() {
1395        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1396    }
1397
1398    public int numCustomPages() {
1399        return hasCustomContent() ? 1 : 0;
1400    }
1401
1402    public boolean isOnOrMovingToCustomContent() {
1403        return hasCustomContent() && getNextPage() == 0;
1404    }
1405
1406    private void updateStateForCustomContent(int screenCenter) {
1407        float translationX = 0;
1408        float progress = 0;
1409        if (hasCustomContent()) {
1410            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1411
1412            int scrollDelta = getScrollX() - getScrollForPage(index) -
1413                    getLayoutTransitionOffsetForPage(index);
1414            float scrollRange = getScrollForPage(index + 1) - getScrollForPage(index);
1415            translationX = scrollRange - scrollDelta;
1416            progress = (scrollRange - scrollDelta) / scrollRange;
1417
1418            if (isLayoutRtl()) {
1419                translationX = Math.min(0, translationX);
1420            } else {
1421                translationX = Math.max(0, translationX);
1422            }
1423            progress = Math.max(0, progress);
1424        }
1425
1426        if (Float.compare(progress, mLastCustomContentScrollProgress) == 0) return;
1427        mLastCustomContentScrollProgress = progress;
1428
1429        setBackgroundAlpha(progress * 0.8f);
1430
1431        if (mLauncher.getHotseat() != null) {
1432            mLauncher.getHotseat().setTranslationX(translationX);
1433        }
1434
1435        if (getPageIndicator() != null) {
1436            getPageIndicator().setTranslationX(translationX);
1437        }
1438
1439        if (mCustomContentCallbacks != null) {
1440            mCustomContentCallbacks.onScrollProgressChanged(progress);
1441        }
1442    }
1443
1444    @Override
1445    protected OnClickListener getPageIndicatorClickListener() {
1446        AccessibilityManager am = (AccessibilityManager)
1447                getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
1448        if (!am.isTouchExplorationEnabled()) {
1449            return null;
1450        }
1451        OnClickListener listener = new OnClickListener() {
1452            @Override
1453            public void onClick(View arg0) {
1454                enterOverviewMode();
1455            }
1456        };
1457        return listener;
1458    }
1459
1460    @Override
1461    protected void screenScrolled(int screenCenter) {
1462        final boolean isRtl = isLayoutRtl();
1463        super.screenScrolled(screenCenter);
1464
1465        updatePageAlphaValues(screenCenter);
1466        updateStateForCustomContent(screenCenter);
1467        enableHwLayersOnVisiblePages();
1468
1469        boolean shouldOverScroll = (mOverScrollX < 0 && (!hasCustomContent() || isLayoutRtl())) ||
1470                (mOverScrollX > mMaxScrollX && (!hasCustomContent() || !isLayoutRtl()));
1471
1472        if (shouldOverScroll) {
1473            int index = 0;
1474            float pivotX = 0f;
1475            final float leftBiasedPivot = 0.25f;
1476            final float rightBiasedPivot = 0.75f;
1477            final int lowerIndex = 0;
1478            final int upperIndex = getChildCount() - 1;
1479
1480            final boolean isLeftPage = mOverScrollX < 0;
1481            index = (!isRtl && isLeftPage) || (isRtl && !isLeftPage) ? lowerIndex : upperIndex;
1482            pivotX = isLeftPage ? rightBiasedPivot : leftBiasedPivot;
1483
1484            CellLayout cl = (CellLayout) getChildAt(index);
1485            float scrollProgress = getScrollProgress(screenCenter, cl, index);
1486            cl.setOverScrollAmount(Math.abs(scrollProgress), isLeftPage);
1487            float rotation = -WORKSPACE_OVERSCROLL_ROTATION * scrollProgress;
1488            cl.setRotationY(rotation);
1489
1490            if (!mOverscrollTransformsSet || Float.compare(mLastOverscrollPivotX, pivotX) != 0) {
1491                mOverscrollTransformsSet = true;
1492                mLastOverscrollPivotX = pivotX;
1493                cl.setCameraDistance(mDensity * mCameraDistance);
1494                cl.setPivotX(cl.getMeasuredWidth() * pivotX);
1495                cl.setPivotY(cl.getMeasuredHeight() * 0.5f);
1496                cl.setOverscrollTransformsDirty(true);
1497            }
1498        } else {
1499            if (mOverscrollTransformsSet) {
1500                mOverscrollTransformsSet = false;
1501                ((CellLayout) getChildAt(0)).resetOverscrollTransforms();
1502                ((CellLayout) getChildAt(getChildCount() - 1)).resetOverscrollTransforms();
1503            }
1504        }
1505    }
1506
1507    @Override
1508    protected void overScroll(float amount) {
1509        acceleratedOverScroll(amount);
1510    }
1511
1512    protected void onAttachedToWindow() {
1513        super.onAttachedToWindow();
1514        mWindowToken = getWindowToken();
1515        computeScroll();
1516        mDragController.setWindowToken(mWindowToken);
1517    }
1518
1519    protected void onDetachedFromWindow() {
1520        super.onDetachedFromWindow();
1521        mWindowToken = null;
1522    }
1523
1524    protected void onResume() {
1525        if (getPageIndicator() != null) {
1526            // In case accessibility state has changed, we need to perform this on every
1527            // attach to window
1528            OnClickListener listener = getPageIndicatorClickListener();
1529            if (listener != null) {
1530                getPageIndicator().setOnClickListener(listener);
1531            }
1532        }
1533        AccessibilityManager am = (AccessibilityManager)
1534                getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
1535        sAccessibilityEnabled = am.isEnabled();
1536    }
1537
1538    @Override
1539    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1540        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1541            mWallpaperOffset.syncWithScroll();
1542            mWallpaperOffset.jumpToFinal();
1543        }
1544        super.onLayout(changed, left, top, right, bottom);
1545    }
1546
1547    @Override
1548    protected void onDraw(Canvas canvas) {
1549        // Draw the background gradient if necessary
1550        if (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground) {
1551            int alpha = (int) (mBackgroundAlpha * 255);
1552            mBackground.setAlpha(alpha);
1553            mBackground.setBounds(getScrollX(), 0, getScrollX() + getMeasuredWidth(),
1554                    getMeasuredHeight());
1555            mBackground.draw(canvas);
1556        }
1557
1558        super.onDraw(canvas);
1559
1560        // Call back to LauncherModel to finish binding after the first draw
1561        post(mBindPages);
1562    }
1563
1564    boolean isDrawingBackgroundGradient() {
1565        return (mBackground != null && mBackgroundAlpha > 0.0f && mDrawBackground);
1566    }
1567
1568    @Override
1569    protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
1570        if (!mLauncher.isAllAppsVisible()) {
1571            final Folder openFolder = getOpenFolder();
1572            if (openFolder != null) {
1573                return openFolder.requestFocus(direction, previouslyFocusedRect);
1574            } else {
1575                return super.onRequestFocusInDescendants(direction, previouslyFocusedRect);
1576            }
1577        }
1578        return false;
1579    }
1580
1581    @Override
1582    public int getDescendantFocusability() {
1583        if (isSmall()) {
1584            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1585        }
1586        return super.getDescendantFocusability();
1587    }
1588
1589    @Override
1590    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
1591        if (!mLauncher.isAllAppsVisible()) {
1592            final Folder openFolder = getOpenFolder();
1593            if (openFolder != null) {
1594                openFolder.addFocusables(views, direction);
1595            } else {
1596                super.addFocusables(views, direction, focusableMode);
1597            }
1598        }
1599    }
1600
1601    public boolean isSmall() {
1602        return mState == State.SMALL || mState == State.SPRING_LOADED || mState == State.OVERVIEW;
1603    }
1604
1605    void enableChildrenCache(int fromPage, int toPage) {
1606        if (fromPage > toPage) {
1607            final int temp = fromPage;
1608            fromPage = toPage;
1609            toPage = temp;
1610        }
1611
1612        final int screenCount = getChildCount();
1613
1614        fromPage = Math.max(fromPage, 0);
1615        toPage = Math.min(toPage, screenCount - 1);
1616
1617        for (int i = fromPage; i <= toPage; i++) {
1618            final CellLayout layout = (CellLayout) getChildAt(i);
1619            layout.setChildrenDrawnWithCacheEnabled(true);
1620            layout.setChildrenDrawingCacheEnabled(true);
1621        }
1622    }
1623
1624    void clearChildrenCache() {
1625        final int screenCount = getChildCount();
1626        for (int i = 0; i < screenCount; i++) {
1627            final CellLayout layout = (CellLayout) getChildAt(i);
1628            layout.setChildrenDrawnWithCacheEnabled(false);
1629            // In software mode, we don't want the items to continue to be drawn into bitmaps
1630            if (!isHardwareAccelerated()) {
1631                layout.setChildrenDrawingCacheEnabled(false);
1632            }
1633        }
1634    }
1635
1636    private void updateChildrenLayersEnabled(boolean force) {
1637        boolean small = mState == State.SMALL || mState == State.OVERVIEW || mIsSwitchingState;
1638        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageMoving();
1639
1640        if (enableChildrenLayers != mChildrenLayersEnabled) {
1641            mChildrenLayersEnabled = enableChildrenLayers;
1642            if (mChildrenLayersEnabled) {
1643                enableHwLayersOnVisiblePages();
1644            } else {
1645                for (int i = 0; i < getPageCount(); i++) {
1646                    final CellLayout cl = (CellLayout) getChildAt(i);
1647                    cl.enableHardwareLayer(false);
1648                }
1649            }
1650        }
1651    }
1652
1653    private void enableHwLayersOnVisiblePages() {
1654        if (mChildrenLayersEnabled) {
1655            final int screenCount = getChildCount();
1656            getVisiblePages(mTempVisiblePagesRange);
1657            int leftScreen = mTempVisiblePagesRange[0];
1658            int rightScreen = mTempVisiblePagesRange[1];
1659            if (leftScreen == rightScreen) {
1660                // make sure we're caching at least two pages always
1661                if (rightScreen < screenCount - 1) {
1662                    rightScreen++;
1663                } else if (leftScreen > 0) {
1664                    leftScreen--;
1665                }
1666            }
1667
1668            final CellLayout customScreen = mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID);
1669            for (int i = 0; i < screenCount; i++) {
1670                final CellLayout layout = (CellLayout) getPageAt(i);
1671
1672                // enable layers between left and right screen inclusive, except for the
1673                // customScreen, which may animate its content during transitions.
1674                boolean enableLayer = layout != customScreen &&
1675                        leftScreen <= i && i <= rightScreen && shouldDrawChild(layout);
1676                layout.enableHardwareLayer(enableLayer);
1677            }
1678        }
1679    }
1680
1681    public void buildPageHardwareLayers() {
1682        // force layers to be enabled just for the call to buildLayer
1683        updateChildrenLayersEnabled(true);
1684        if (getWindowToken() != null) {
1685            final int childCount = getChildCount();
1686            for (int i = 0; i < childCount; i++) {
1687                CellLayout cl = (CellLayout) getChildAt(i);
1688                cl.buildHardwareLayer();
1689            }
1690        }
1691        updateChildrenLayersEnabled(false);
1692    }
1693
1694    protected void onWallpaperTap(MotionEvent ev) {
1695        final int[] position = mTempCell;
1696        getLocationOnScreen(position);
1697
1698        int pointerIndex = ev.getActionIndex();
1699        position[0] += (int) ev.getX(pointerIndex);
1700        position[1] += (int) ev.getY(pointerIndex);
1701
1702        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1703                ev.getAction() == MotionEvent.ACTION_UP
1704                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1705                position[0], position[1], 0, null);
1706    }
1707
1708    /*
1709     * This interpolator emulates the rate at which the perceived scale of an object changes
1710     * as its distance from a camera increases. When this interpolator is applied to a scale
1711     * animation on a view, it evokes the sense that the object is shrinking due to moving away
1712     * from the camera.
1713     */
1714    static class ZInterpolator implements TimeInterpolator {
1715        private float focalLength;
1716
1717        public ZInterpolator(float foc) {
1718            focalLength = foc;
1719        }
1720
1721        public float getInterpolation(float input) {
1722            return (1.0f - focalLength / (focalLength + input)) /
1723                (1.0f - focalLength / (focalLength + 1.0f));
1724        }
1725    }
1726
1727    /*
1728     * The exact reverse of ZInterpolator.
1729     */
1730    static class InverseZInterpolator implements TimeInterpolator {
1731        private ZInterpolator zInterpolator;
1732        public InverseZInterpolator(float foc) {
1733            zInterpolator = new ZInterpolator(foc);
1734        }
1735        public float getInterpolation(float input) {
1736            return 1 - zInterpolator.getInterpolation(1 - input);
1737        }
1738    }
1739
1740    /*
1741     * ZInterpolator compounded with an ease-out.
1742     */
1743    static class ZoomOutInterpolator implements TimeInterpolator {
1744        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(0.75f);
1745        private final ZInterpolator zInterpolator = new ZInterpolator(0.13f);
1746
1747        public float getInterpolation(float input) {
1748            return decelerate.getInterpolation(zInterpolator.getInterpolation(input));
1749        }
1750    }
1751
1752    /*
1753     * InvereZInterpolator compounded with an ease-out.
1754     */
1755    static class ZoomInInterpolator implements TimeInterpolator {
1756        private final InverseZInterpolator inverseZInterpolator = new InverseZInterpolator(0.35f);
1757        private final DecelerateInterpolator decelerate = new DecelerateInterpolator(3.0f);
1758
1759        public float getInterpolation(float input) {
1760            return decelerate.getInterpolation(inverseZInterpolator.getInterpolation(input));
1761        }
1762    }
1763
1764    private final ZoomInInterpolator mZoomInInterpolator = new ZoomInInterpolator();
1765
1766    /*
1767    *
1768    * We call these methods (onDragStartedWithItemSpans/onDragStartedWithSize) whenever we
1769    * start a drag in Launcher, regardless of whether the drag has ever entered the Workspace
1770    *
1771    * These methods mark the appropriate pages as accepting drops (which alters their visual
1772    * appearance).
1773    *
1774    */
1775    public void onDragStartedWithItem(View v) {
1776        final Canvas canvas = new Canvas();
1777
1778        // The outline is used to visualize where the item will land if dropped
1779        mDragOutline = createDragOutline(v, canvas, DRAG_BITMAP_PADDING);
1780    }
1781
1782    public void onDragStartedWithItem(PendingAddItemInfo info, Bitmap b, boolean clipAlpha) {
1783        final Canvas canvas = new Canvas();
1784
1785        int[] size = estimateItemSize(info.spanX, info.spanY, info, false);
1786
1787        // The outline is used to visualize where the item will land if dropped
1788        mDragOutline = createDragOutline(b, canvas, DRAG_BITMAP_PADDING, size[0],
1789                size[1], clipAlpha);
1790    }
1791
1792    public void exitWidgetResizeMode() {
1793        DragLayer dragLayer = mLauncher.getDragLayer();
1794        dragLayer.clearAllResizeFrames();
1795    }
1796
1797    private void initAnimationArrays() {
1798        final int childCount = getChildCount();
1799        if (mLastChildCount == childCount) return;
1800
1801        mOldBackgroundAlphas = new float[childCount];
1802        mOldAlphas = new float[childCount];
1803        mNewBackgroundAlphas = new float[childCount];
1804        mNewAlphas = new float[childCount];
1805    }
1806
1807    Animator getChangeStateAnimation(final State state, boolean animated) {
1808        return getChangeStateAnimation(state, animated, 0, -1);
1809    }
1810
1811    @Override
1812    protected void getOverviewModePages(int[] range) {
1813        int start = numCustomPages();
1814        int end = getChildCount() - 1;
1815
1816        range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
1817        range[1] = Math.max(0,  end);
1818     }
1819
1820    protected void onStartReordering() {
1821        super.onStartReordering();
1822        showOutlines();
1823        // Reordering handles its own animations, disable the automatic ones.
1824        setLayoutTransition(null);
1825    }
1826
1827    protected void onEndReordering() {
1828        super.onEndReordering();
1829
1830        hideOutlines();
1831        mScreenOrder.clear();
1832        int count = getChildCount();
1833        for (int i = 0; i < count; i++) {
1834            CellLayout cl = ((CellLayout) getChildAt(i));
1835            mScreenOrder.add(getIdForScreen(cl));
1836        }
1837
1838        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1839
1840        // Re-enable auto layout transitions for page deletion.
1841        setLayoutTransition(mLayoutTransition);
1842    }
1843
1844    public boolean isInOverviewMode() {
1845        return mState == State.OVERVIEW;
1846    }
1847
1848    public boolean enterOverviewMode() {
1849        if (mTouchState != TOUCH_STATE_REST) {
1850            return false;
1851        }
1852        enableOverviewMode(true, -1, true);
1853        return true;
1854    }
1855
1856    public void exitOverviewMode(boolean animated) {
1857        exitOverviewMode(-1, animated);
1858    }
1859
1860    public void exitOverviewMode(int snapPage, boolean animated) {
1861        enableOverviewMode(false, snapPage, animated);
1862    }
1863
1864    private void enableOverviewMode(boolean enable, int snapPage, boolean animated) {
1865        State finalState = Workspace.State.OVERVIEW;
1866        if (!enable) {
1867            finalState = Workspace.State.NORMAL;
1868        }
1869
1870        Animator workspaceAnim = getChangeStateAnimation(finalState, animated, 0, snapPage);
1871        if (workspaceAnim != null) {
1872            onTransitionPrepare();
1873            workspaceAnim.addListener(new AnimatorListenerAdapter() {
1874                @Override
1875                public void onAnimationEnd(Animator arg0) {
1876                    onTransitionEnd();
1877                }
1878            });
1879            workspaceAnim.start();
1880        }
1881    }
1882
1883    int getOverviewModeTranslationY() {
1884        int childHeight = getNormalChildHeight();
1885        int viewPortHeight = getViewportHeight();
1886        int scaledChildHeight = (int) (mOverviewModeShrinkFactor * childHeight);
1887
1888        int offset = (viewPortHeight - scaledChildHeight) / 2;
1889        int offsetDelta = mOverviewModePageOffset - offset + mInsets.top;
1890
1891        return offsetDelta;
1892    }
1893
1894    boolean shouldVoiceButtonProxyBeVisible() {
1895        if (isOnOrMovingToCustomContent()) {
1896            return false;
1897        }
1898        if (mState != State.NORMAL) {
1899            return false;
1900        }
1901        return true;
1902    }
1903
1904    public void updateInteractionForState() {
1905        if (mState != State.NORMAL) {
1906            mLauncher.onInteractionBegin();
1907        } else {
1908            mLauncher.onInteractionEnd();
1909        }
1910    }
1911
1912    private void setState(State state) {
1913        mState = state;
1914        updateInteractionForState();
1915        updateAccessibilityFlags();
1916    }
1917
1918    private void updateAccessibilityFlags() {
1919        int accessible = mState == State.NORMAL ?
1920                ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES :
1921                ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
1922        setImportantForAccessibility(accessible);
1923    }
1924
1925    Animator getChangeStateAnimation(final State state, boolean animated, int delay, int snapPage) {
1926        if (mState == state) {
1927            return null;
1928        }
1929
1930        // Initialize animation arrays for the first time if necessary
1931        initAnimationArrays();
1932
1933        AnimatorSet anim = animated ? LauncherAnimUtils.createAnimatorSet() : null;
1934
1935        final State oldState = mState;
1936        final boolean oldStateIsNormal = (oldState == State.NORMAL);
1937        final boolean oldStateIsSpringLoaded = (oldState == State.SPRING_LOADED);
1938        final boolean oldStateIsSmall = (oldState == State.SMALL);
1939        final boolean oldStateIsOverview = (oldState == State.OVERVIEW);
1940        setState(state);
1941        final boolean stateIsNormal = (state == State.NORMAL);
1942        final boolean stateIsSpringLoaded = (state == State.SPRING_LOADED);
1943        final boolean stateIsSmall = (state == State.SMALL);
1944        final boolean stateIsOverview = (state == State.OVERVIEW);
1945        float finalBackgroundAlpha = (stateIsSpringLoaded || stateIsOverview) ? 1.0f : 0f;
1946        float finalHotseatAndPageIndicatorAlpha = (stateIsOverview || stateIsSmall) ? 0f : 1f;
1947        float finalOverviewPanelAlpha = stateIsOverview ? 1f : 0f;
1948        float finalSearchBarAlpha = !stateIsNormal ? 0f : 1f;
1949        float finalWorkspaceTranslationY = stateIsOverview ? getOverviewModeTranslationY() : 0;
1950
1951        boolean workspaceToAllApps = (oldStateIsNormal && stateIsSmall);
1952        boolean allAppsToWorkspace = (oldStateIsSmall && stateIsNormal);
1953        mNewScale = 1.0f;
1954
1955        if (oldStateIsOverview) {
1956            disableFreeScroll(snapPage);
1957        } else if (stateIsOverview) {
1958            enableFreeScroll();
1959        }
1960
1961        if (state != State.NORMAL) {
1962            if (stateIsSpringLoaded) {
1963                mNewScale = mSpringLoadedShrinkFactor;
1964            } else if (stateIsOverview) {
1965                mNewScale = mOverviewModeShrinkFactor;
1966            } else if (stateIsSmall){
1967                mNewScale = mOverviewModeShrinkFactor - 0.3f;
1968            }
1969            if (workspaceToAllApps) {
1970                updateChildrenLayersEnabled(false);
1971            }
1972        }
1973
1974        final int duration = workspaceToAllApps ?
1975                getResources().getInteger(R.integer.config_workspaceUnshrinkTime) :
1976                getResources().getInteger(R.integer.config_appsCustomizeWorkspaceShrinkTime);
1977        for (int i = 0; i < getChildCount(); i++) {
1978            final CellLayout cl = (CellLayout) getChildAt(i);
1979            boolean isCurrentPage = (i == getNextPage());
1980            float initialAlpha = cl.getShortcutsAndWidgets().getAlpha();
1981            float finalAlpha = stateIsSmall ? 0f : 1f;
1982
1983            // If we are animating to/from the small state, then hide the side pages and fade the
1984            // current page in
1985            if (!mIsSwitchingState) {
1986                if (workspaceToAllApps || allAppsToWorkspace) {
1987                    if (allAppsToWorkspace && isCurrentPage) {
1988                        initialAlpha = 0f;
1989                    } else if (!isCurrentPage) {
1990                        initialAlpha = finalAlpha = 0f;
1991                    }
1992                    cl.setShortcutAndWidgetAlpha(initialAlpha);
1993                }
1994            }
1995
1996            mOldAlphas[i] = initialAlpha;
1997            mNewAlphas[i] = finalAlpha;
1998            if (animated) {
1999                mOldBackgroundAlphas[i] = cl.getBackgroundAlpha();
2000                mNewBackgroundAlphas[i] = finalBackgroundAlpha;
2001            } else {
2002                cl.setBackgroundAlpha(finalBackgroundAlpha);
2003                cl.setShortcutAndWidgetAlpha(finalAlpha);
2004            }
2005        }
2006
2007        final View searchBar = mLauncher.getQsbBar();
2008        final View overviewPanel = mLauncher.getOverviewPanel();
2009        final View hotseat = mLauncher.getHotseat();
2010        if (animated) {
2011            LauncherViewPropertyAnimator scale = new LauncherViewPropertyAnimator(this);
2012            scale.scaleX(mNewScale)
2013                .scaleY(mNewScale)
2014                .translationY(finalWorkspaceTranslationY)
2015                .setInterpolator(mZoomInInterpolator);
2016            anim.play(scale);
2017            for (int index = 0; index < getChildCount(); index++) {
2018                final int i = index;
2019                final CellLayout cl = (CellLayout) getChildAt(i);
2020                float currentAlpha = cl.getShortcutsAndWidgets().getAlpha();
2021                if (mOldAlphas[i] == 0 && mNewAlphas[i] == 0) {
2022                    cl.setBackgroundAlpha(mNewBackgroundAlphas[i]);
2023                    cl.setShortcutAndWidgetAlpha(mNewAlphas[i]);
2024                } else {
2025                    if (mOldAlphas[i] != mNewAlphas[i] || currentAlpha != mNewAlphas[i]) {
2026                        LauncherViewPropertyAnimator alphaAnim =
2027                            new LauncherViewPropertyAnimator(cl.getShortcutsAndWidgets());
2028                        alphaAnim.alpha(mNewAlphas[i])
2029                            .setDuration(duration)
2030                            .setInterpolator(mZoomInInterpolator);
2031                        anim.play(alphaAnim);
2032                    }
2033                    if (mOldBackgroundAlphas[i] != 0 ||
2034                        mNewBackgroundAlphas[i] != 0) {
2035                        ValueAnimator bgAnim =
2036                                LauncherAnimUtils.ofFloat(cl, 0f, 1f).setDuration(duration);
2037                        bgAnim.setInterpolator(mZoomInInterpolator);
2038                        bgAnim.addUpdateListener(new LauncherAnimatorUpdateListener() {
2039                                public void onAnimationUpdate(float a, float b) {
2040                                    cl.setBackgroundAlpha(
2041                                            a * mOldBackgroundAlphas[i] +
2042                                            b * mNewBackgroundAlphas[i]);
2043                                }
2044                            });
2045                        anim.play(bgAnim);
2046                    }
2047                }
2048            }
2049            ObjectAnimator pageIndicatorAlpha = null;
2050            if (getPageIndicator() != null) {
2051                pageIndicatorAlpha = ObjectAnimator.ofFloat(getPageIndicator(), "alpha",
2052                        finalHotseatAndPageIndicatorAlpha);
2053            }
2054            ObjectAnimator hotseatAlpha = ObjectAnimator.ofFloat(hotseat, "alpha",
2055                    finalHotseatAndPageIndicatorAlpha);
2056            ObjectAnimator searchBarAlpha = ObjectAnimator.ofFloat(searchBar,
2057                    "alpha", finalSearchBarAlpha);
2058            ObjectAnimator overviewPanelAlpha = ObjectAnimator.ofFloat(overviewPanel,
2059                    "alpha", finalOverviewPanelAlpha);
2060
2061            overviewPanelAlpha.addUpdateListener(new AlphaUpdateListener(overviewPanel));
2062            hotseatAlpha.addUpdateListener(new AlphaUpdateListener(hotseat));
2063            searchBarAlpha.addUpdateListener(new AlphaUpdateListener(searchBar));
2064
2065            if (getPageIndicator() != null) {
2066                pageIndicatorAlpha.addUpdateListener(new AlphaUpdateListener(getPageIndicator()));
2067            }
2068
2069
2070            anim.play(overviewPanelAlpha);
2071            anim.play(hotseatAlpha);
2072            anim.play(searchBarAlpha);
2073            anim.play(pageIndicatorAlpha);
2074            anim.setStartDelay(delay);
2075        } else {
2076            overviewPanel.setAlpha(finalOverviewPanelAlpha);
2077            AlphaUpdateListener.updateVisibility(overviewPanel);
2078            hotseat.setAlpha(finalHotseatAndPageIndicatorAlpha);
2079            AlphaUpdateListener.updateVisibility(hotseat);
2080            if (getPageIndicator() != null) {
2081                getPageIndicator().setAlpha(finalHotseatAndPageIndicatorAlpha);
2082                AlphaUpdateListener.updateVisibility(getPageIndicator());
2083            }
2084            searchBar.setAlpha(finalSearchBarAlpha);
2085            AlphaUpdateListener.updateVisibility(searchBar);
2086            updateCustomContentVisibility();
2087            setScaleX(mNewScale);
2088            setScaleY(mNewScale);
2089            setTranslationY(finalWorkspaceTranslationY);
2090        }
2091        mLauncher.updateVoiceButtonProxyVisible(false);
2092
2093        if (stateIsSpringLoaded) {
2094            // Right now we're covered by Apps Customize
2095            // Show the background gradient immediately, so the gradient will
2096            // be showing once AppsCustomize disappears
2097            animateBackgroundGradient(getResources().getInteger(
2098                    R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f, false);
2099        } else if (stateIsOverview) {
2100            animateBackgroundGradient(getResources().getInteger(
2101                    R.integer.config_appsCustomizeSpringLoadedBgAlpha) / 100f, true);
2102        } else {
2103            // Fade the background gradient away
2104            animateBackgroundGradient(0f, animated);
2105        }
2106        return anim;
2107    }
2108
2109    static class AlphaUpdateListener implements AnimatorUpdateListener {
2110        View view;
2111        public AlphaUpdateListener(View v) {
2112            view = v;
2113        }
2114
2115        @Override
2116        public void onAnimationUpdate(ValueAnimator arg0) {
2117            updateVisibility(view);
2118        }
2119
2120        public static void updateVisibility(View view) {
2121            // We want to avoid the extra layout pass by setting the views to GONE unless
2122            // accessibility is on, in which case not setting them to GONE causes a glitch.
2123            int invisibleState = sAccessibilityEnabled ? GONE : INVISIBLE;
2124            if (view.getAlpha() < ALPHA_CUTOFF_THRESHOLD && view.getVisibility() != invisibleState) {
2125                view.setVisibility(invisibleState);
2126            } else if (view.getAlpha() > ALPHA_CUTOFF_THRESHOLD
2127                    && view.getVisibility() != VISIBLE) {
2128                view.setVisibility(VISIBLE);
2129            }
2130        }
2131    }
2132
2133    @Override
2134    public void onLauncherTransitionPrepare(Launcher l, boolean animated, boolean toWorkspace) {
2135        onTransitionPrepare();
2136    }
2137
2138    @Override
2139    public void onLauncherTransitionStart(Launcher l, boolean animated, boolean toWorkspace) {
2140    }
2141
2142    @Override
2143    public void onLauncherTransitionStep(Launcher l, float t) {
2144        mTransitionProgress = t;
2145    }
2146
2147    @Override
2148    public void onLauncherTransitionEnd(Launcher l, boolean animated, boolean toWorkspace) {
2149        onTransitionEnd();
2150    }
2151
2152    private void onTransitionPrepare() {
2153        mIsSwitchingState = true;
2154
2155        // Invalidate here to ensure that the pages are rendered during the state change transition.
2156        invalidate();
2157
2158        updateChildrenLayersEnabled(false);
2159        hideCustomContentIfNecessary();
2160    }
2161
2162    void updateCustomContentVisibility() {
2163        int visibility = mState == Workspace.State.NORMAL ? VISIBLE : INVISIBLE;
2164        if (hasCustomContent()) {
2165            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(visibility);
2166        }
2167    }
2168
2169    void showCustomContentIfNecessary() {
2170        boolean show  = mState == Workspace.State.NORMAL;
2171        if (show && hasCustomContent()) {
2172            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(VISIBLE);
2173        }
2174    }
2175
2176    void hideCustomContentIfNecessary() {
2177        boolean hide  = mState != Workspace.State.NORMAL;
2178        if (hide && hasCustomContent()) {
2179            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
2180        }
2181    }
2182
2183    private void onTransitionEnd() {
2184        mIsSwitchingState = false;
2185        updateChildrenLayersEnabled(false);
2186        // The code in getChangeStateAnimation to determine initialAlpha and finalAlpha will ensure
2187        // ensure that only the current page is visible during (and subsequently, after) the
2188        // transition animation.  If fade adjacent pages is disabled, then re-enable the page
2189        // visibility after the transition animation.
2190        if (!mWorkspaceFadeInAdjacentScreens) {
2191            for (int i = 0; i < getChildCount(); i++) {
2192                final CellLayout cl = (CellLayout) getChildAt(i);
2193                cl.setShortcutAndWidgetAlpha(1f);
2194            }
2195        }
2196        showCustomContentIfNecessary();
2197    }
2198
2199    @Override
2200    public View getContent() {
2201        return this;
2202    }
2203
2204    /**
2205     * Draw the View v into the given Canvas.
2206     *
2207     * @param v the view to draw
2208     * @param destCanvas the canvas to draw on
2209     * @param padding the horizontal and vertical padding to use when drawing
2210     */
2211    private void drawDragView(View v, Canvas destCanvas, int padding, boolean pruneToDrawable) {
2212        final Rect clipRect = mTempRect;
2213        v.getDrawingRect(clipRect);
2214
2215        boolean textVisible = false;
2216
2217        destCanvas.save();
2218        if (v instanceof TextView && pruneToDrawable) {
2219            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2220            clipRect.set(0, 0, d.getIntrinsicWidth() + padding, d.getIntrinsicHeight() + padding);
2221            destCanvas.translate(padding / 2, padding / 2);
2222            d.draw(destCanvas);
2223        } else {
2224            if (v instanceof FolderIcon) {
2225                // For FolderIcons the text can bleed into the icon area, and so we need to
2226                // hide the text completely (which can't be achieved by clipping).
2227                if (((FolderIcon) v).getTextVisible()) {
2228                    ((FolderIcon) v).setTextVisible(false);
2229                    textVisible = true;
2230                }
2231            } else if (v instanceof BubbleTextView) {
2232                final BubbleTextView tv = (BubbleTextView) v;
2233                clipRect.bottom = tv.getExtendedPaddingTop() - (int) BubbleTextView.PADDING_V +
2234                        tv.getLayout().getLineTop(0);
2235            } else if (v instanceof TextView) {
2236                final TextView tv = (TextView) v;
2237                clipRect.bottom = tv.getExtendedPaddingTop() - tv.getCompoundDrawablePadding() +
2238                        tv.getLayout().getLineTop(0);
2239            }
2240            destCanvas.translate(-v.getScrollX() + padding / 2, -v.getScrollY() + padding / 2);
2241            destCanvas.clipRect(clipRect, Op.REPLACE);
2242            v.draw(destCanvas);
2243
2244            // Restore text visibility of FolderIcon if necessary
2245            if (textVisible) {
2246                ((FolderIcon) v).setTextVisible(true);
2247            }
2248        }
2249        destCanvas.restore();
2250    }
2251
2252    /**
2253     * Returns a new bitmap to show when the given View is being dragged around.
2254     * Responsibility for the bitmap is transferred to the caller.
2255     */
2256    public Bitmap createDragBitmap(View v, Canvas canvas, int padding) {
2257        Bitmap b;
2258
2259        if (v instanceof TextView) {
2260            Drawable d = ((TextView) v).getCompoundDrawables()[1];
2261            b = Bitmap.createBitmap(d.getIntrinsicWidth() + padding,
2262                    d.getIntrinsicHeight() + padding, Bitmap.Config.ARGB_8888);
2263        } else {
2264            b = Bitmap.createBitmap(
2265                    v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2266        }
2267
2268        canvas.setBitmap(b);
2269        drawDragView(v, canvas, padding, true);
2270        canvas.setBitmap(null);
2271
2272        return b;
2273    }
2274
2275    /**
2276     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2277     * Responsibility for the bitmap is transferred to the caller.
2278     */
2279    private Bitmap createDragOutline(View v, Canvas canvas, int padding) {
2280        final int outlineColor = getResources().getColor(R.color.outline_color);
2281        final Bitmap b = Bitmap.createBitmap(
2282                v.getWidth() + padding, v.getHeight() + padding, Bitmap.Config.ARGB_8888);
2283
2284        canvas.setBitmap(b);
2285        drawDragView(v, canvas, padding, true);
2286        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor);
2287        canvas.setBitmap(null);
2288        return b;
2289    }
2290
2291    /**
2292     * Returns a new bitmap to be used as the object outline, e.g. to visualize the drop location.
2293     * Responsibility for the bitmap is transferred to the caller.
2294     */
2295    private Bitmap createDragOutline(Bitmap orig, Canvas canvas, int padding, int w, int h,
2296            boolean clipAlpha) {
2297        final int outlineColor = getResources().getColor(R.color.outline_color);
2298        final Bitmap b = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
2299        canvas.setBitmap(b);
2300
2301        Rect src = new Rect(0, 0, orig.getWidth(), orig.getHeight());
2302        float scaleFactor = Math.min((w - padding) / (float) orig.getWidth(),
2303                (h - padding) / (float) orig.getHeight());
2304        int scaledWidth = (int) (scaleFactor * orig.getWidth());
2305        int scaledHeight = (int) (scaleFactor * orig.getHeight());
2306        Rect dst = new Rect(0, 0, scaledWidth, scaledHeight);
2307
2308        // center the image
2309        dst.offset((w - scaledWidth) / 2, (h - scaledHeight) / 2);
2310
2311        canvas.drawBitmap(orig, src, dst, null);
2312        mOutlineHelper.applyMediumExpensiveOutlineWithBlur(b, canvas, outlineColor, outlineColor,
2313                clipAlpha);
2314        canvas.setBitmap(null);
2315
2316        return b;
2317    }
2318
2319    void startDrag(CellLayout.CellInfo cellInfo) {
2320        View child = cellInfo.cell;
2321
2322        // Make sure the drag was started by a long press as opposed to a long click.
2323        if (!child.isInTouchMode()) {
2324            return;
2325        }
2326
2327        mDragInfo = cellInfo;
2328        child.setVisibility(INVISIBLE);
2329        CellLayout layout = (CellLayout) child.getParent().getParent();
2330        layout.prepareChildForDrag(child);
2331
2332        child.clearFocus();
2333        child.setPressed(false);
2334
2335        final Canvas canvas = new Canvas();
2336
2337        // The outline is used to visualize where the item will land if dropped
2338        mDragOutline = createDragOutline(child, canvas, DRAG_BITMAP_PADDING);
2339        beginDragShared(child, this);
2340    }
2341
2342    public void beginDragShared(View child, DragSource source) {
2343        // The drag bitmap follows the touch point around on the screen
2344        final Bitmap b = createDragBitmap(child, new Canvas(), DRAG_BITMAP_PADDING);
2345
2346        final int bmpWidth = b.getWidth();
2347        final int bmpHeight = b.getHeight();
2348
2349        float scale = mLauncher.getDragLayer().getLocationInDragLayer(child, mTempXY);
2350        int dragLayerX =
2351                Math.round(mTempXY[0] - (bmpWidth - scale * child.getWidth()) / 2);
2352        int dragLayerY =
2353                Math.round(mTempXY[1] - (bmpHeight - scale * bmpHeight) / 2
2354                        - DRAG_BITMAP_PADDING / 2);
2355
2356        LauncherAppState app = LauncherAppState.getInstance();
2357        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
2358        Point dragVisualizeOffset = null;
2359        Rect dragRect = null;
2360        if (child instanceof BubbleTextView || child instanceof PagedViewIcon) {
2361            int iconSize = grid.iconSizePx;
2362            int top = child.getPaddingTop();
2363            int left = (bmpWidth - iconSize) / 2;
2364            int right = left + iconSize;
2365            int bottom = top + iconSize;
2366            dragLayerY += top;
2367            // Note: The drag region is used to calculate drag layer offsets, but the
2368            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2369            dragVisualizeOffset = new Point(-DRAG_BITMAP_PADDING / 2, DRAG_BITMAP_PADDING / 2);
2370            dragRect = new Rect(left, top, right, bottom);
2371        } else if (child instanceof FolderIcon) {
2372            int previewSize = grid.folderIconSizePx;
2373            dragRect = new Rect(0, child.getPaddingTop(), child.getWidth(), previewSize);
2374        }
2375
2376        // Clear the pressed state if necessary
2377        if (child instanceof BubbleTextView) {
2378            BubbleTextView icon = (BubbleTextView) child;
2379            icon.clearPressedOrFocusedBackground();
2380        }
2381
2382        mDragController.startDrag(b, dragLayerX, dragLayerY, source, child.getTag(),
2383                DragController.DRAG_ACTION_MOVE, dragVisualizeOffset, dragRect, scale);
2384
2385        if (child.getParent() instanceof ShortcutAndWidgetContainer) {
2386            mDragSourceInternal = (ShortcutAndWidgetContainer) child.getParent();
2387        }
2388
2389        b.recycle();
2390    }
2391
2392    void addApplicationShortcut(ShortcutInfo info, CellLayout target, long container, long screenId,
2393            int cellX, int cellY, boolean insertAtFirst, int intersectX, int intersectY) {
2394        View view = mLauncher.createShortcut(R.layout.application, target, (ShortcutInfo) info);
2395
2396        final int[] cellXY = new int[2];
2397        target.findCellForSpanThatIntersects(cellXY, 1, 1, intersectX, intersectY);
2398        addInScreen(view, container, screenId, cellXY[0], cellXY[1], 1, 1, insertAtFirst);
2399
2400        LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId, cellXY[0],
2401                cellXY[1]);
2402    }
2403
2404    public boolean transitionStateShouldAllowDrop() {
2405        return ((!isSwitchingState() || mTransitionProgress > 0.5f) && mState != State.SMALL);
2406    }
2407
2408    /**
2409     * {@inheritDoc}
2410     */
2411    public boolean acceptDrop(DragObject d) {
2412        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2413        CellLayout dropTargetLayout = mDropToLayout;
2414        if (d.dragSource != this) {
2415            // Don't accept the drop if we're not over a screen at time of drop
2416            if (dropTargetLayout == null) {
2417                return false;
2418            }
2419            if (!transitionStateShouldAllowDrop()) return false;
2420
2421            mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
2422                    d.dragView, mDragViewVisualCenter);
2423
2424            // We want the point to be mapped to the dragTarget.
2425            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2426                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2427            } else {
2428                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter, null);
2429            }
2430
2431            int spanX = 1;
2432            int spanY = 1;
2433            if (mDragInfo != null) {
2434                final CellLayout.CellInfo dragCellInfo = mDragInfo;
2435                spanX = dragCellInfo.spanX;
2436                spanY = dragCellInfo.spanY;
2437            } else {
2438                final ItemInfo dragInfo = (ItemInfo) d.dragInfo;
2439                spanX = dragInfo.spanX;
2440                spanY = dragInfo.spanY;
2441            }
2442
2443            int minSpanX = spanX;
2444            int minSpanY = spanY;
2445            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2446                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2447                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2448            }
2449
2450            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2451                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2452                    mTargetCell);
2453            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2454                    mDragViewVisualCenter[1], mTargetCell);
2455            if (willCreateUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2456                    mTargetCell, distance, true)) {
2457                return true;
2458            }
2459            if (willAddToExistingUserFolder((ItemInfo) d.dragInfo, dropTargetLayout,
2460                    mTargetCell, distance)) {
2461                return true;
2462            }
2463
2464            int[] resultSpan = new int[2];
2465            mTargetCell = dropTargetLayout.createArea((int) mDragViewVisualCenter[0],
2466                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
2467                    null, mTargetCell, resultSpan, CellLayout.MODE_ACCEPT_DROP);
2468            boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2469
2470            // Don't accept the drop if there's no room for the item
2471            if (!foundCell) {
2472                // Don't show the message if we are dropping on the AllApps button and the hotseat
2473                // is full
2474                boolean isHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2475                if (mTargetCell != null && isHotseat) {
2476                    Hotseat hotseat = mLauncher.getHotseat();
2477                    if (hotseat.isAllAppsButtonRank(
2478                            hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]))) {
2479                        return false;
2480                    }
2481                }
2482
2483                mLauncher.showOutOfSpaceMessage(isHotseat);
2484                return false;
2485            }
2486        }
2487
2488        long screenId = getIdForScreen(dropTargetLayout);
2489        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
2490            commitExtraEmptyScreen();
2491        }
2492
2493        return true;
2494    }
2495
2496    boolean willCreateUserFolder(ItemInfo info, CellLayout target, int[] targetCell, float
2497            distance, boolean considerTimeout) {
2498        if (distance > mMaxDistanceForFolderCreation) return false;
2499        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2500
2501        if (dropOverView != null) {
2502            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2503            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2504                return false;
2505            }
2506        }
2507
2508        boolean hasntMoved = false;
2509        if (mDragInfo != null) {
2510            hasntMoved = dropOverView == mDragInfo.cell;
2511        }
2512
2513        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2514            return false;
2515        }
2516
2517        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2518        boolean willBecomeShortcut =
2519                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2520                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT);
2521
2522        return (aboveShortcut && willBecomeShortcut);
2523    }
2524
2525    boolean willAddToExistingUserFolder(Object dragInfo, CellLayout target, int[] targetCell,
2526            float distance) {
2527        if (distance > mMaxDistanceForFolderCreation) return false;
2528        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2529
2530        if (dropOverView != null) {
2531            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2532            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.tmpCellY)) {
2533                return false;
2534            }
2535        }
2536
2537        if (dropOverView instanceof FolderIcon) {
2538            FolderIcon fi = (FolderIcon) dropOverView;
2539            if (fi.acceptDrop(dragInfo)) {
2540                return true;
2541            }
2542        }
2543        return false;
2544    }
2545
2546    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2547            int[] targetCell, float distance, boolean external, DragView dragView,
2548            Runnable postAnimationRunnable) {
2549        if (distance > mMaxDistanceForFolderCreation) return false;
2550        View v = target.getChildAt(targetCell[0], targetCell[1]);
2551
2552        boolean hasntMoved = false;
2553        if (mDragInfo != null) {
2554            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2555            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2556                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2557        }
2558
2559        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2560        mCreateUserFolderOnDrop = false;
2561        final long screenId = (targetCell == null) ? mDragInfo.screenId : getIdForScreen(target);
2562
2563        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2564        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2565
2566        if (aboveShortcut && willBecomeShortcut) {
2567            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2568            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2569            // if the drag started here, we need to remove it from the workspace
2570            if (!external) {
2571                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2572            }
2573
2574            Rect folderLocation = new Rect();
2575            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2576            target.removeView(v);
2577
2578            FolderIcon fi =
2579                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2580            destInfo.cellX = -1;
2581            destInfo.cellY = -1;
2582            sourceInfo.cellX = -1;
2583            sourceInfo.cellY = -1;
2584
2585            // If the dragView is null, we can't animate
2586            boolean animate = dragView != null;
2587            if (animate) {
2588                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2589                        postAnimationRunnable);
2590            } else {
2591                fi.addItem(destInfo);
2592                fi.addItem(sourceInfo);
2593            }
2594            return true;
2595        }
2596        return false;
2597    }
2598
2599    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2600            float distance, DragObject d, boolean external) {
2601        if (distance > mMaxDistanceForFolderCreation) return false;
2602
2603        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2604        if (!mAddToExistingFolderOnDrop) return false;
2605        mAddToExistingFolderOnDrop = false;
2606
2607        if (dropOverView instanceof FolderIcon) {
2608            FolderIcon fi = (FolderIcon) dropOverView;
2609            if (fi.acceptDrop(d.dragInfo)) {
2610                fi.onDrop(d);
2611
2612                // if the drag started here, we need to remove it from the workspace
2613                if (!external) {
2614                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2615                }
2616                return true;
2617            }
2618        }
2619        return false;
2620    }
2621
2622    public void onDrop(final DragObject d) {
2623        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset, d.dragView,
2624                mDragViewVisualCenter);
2625
2626        CellLayout dropTargetLayout = mDropToLayout;
2627
2628        // We want the point to be mapped to the dragTarget.
2629        if (dropTargetLayout != null) {
2630            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2631                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2632            } else {
2633                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter, null);
2634            }
2635        }
2636
2637        int snapScreen = -1;
2638        boolean resizeOnDrop = false;
2639        if (d.dragSource != this) {
2640            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2641                    (int) mDragViewVisualCenter[1] };
2642            onDropExternal(touchXY, d.dragInfo, dropTargetLayout, false, d);
2643        } else if (mDragInfo != null) {
2644            final View cell = mDragInfo.cell;
2645
2646            Runnable resizeRunnable = null;
2647            if (dropTargetLayout != null && !d.cancelled) {
2648                // Move internally
2649                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2650                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2651                long container = hasMovedIntoHotseat ?
2652                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2653                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2654                long screenId = (mTargetCell[0] < 0) ?
2655                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2656                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2657                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2658                // First we find the cell nearest to point at which the item is
2659                // dropped, without any consideration to whether there is an item there.
2660
2661                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2662                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2663                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2664                        mDragViewVisualCenter[1], mTargetCell);
2665
2666                // If the item being dropped is a shortcut and the nearest drop
2667                // cell also contains a shortcut, then create a folder with the two shortcuts.
2668                if (!mInScrollArea && createUserFolderIfNecessary(cell, container,
2669                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2670                    stripEmptyScreens();
2671                    return;
2672                }
2673
2674                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2675                        distance, d, false)) {
2676                    stripEmptyScreens();
2677                    return;
2678                }
2679
2680                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2681                // we need to find the nearest cell location that is vacant
2682                ItemInfo item = (ItemInfo) d.dragInfo;
2683                int minSpanX = item.spanX;
2684                int minSpanY = item.spanY;
2685                if (item.minSpanX > 0 && item.minSpanY > 0) {
2686                    minSpanX = item.minSpanX;
2687                    minSpanY = item.minSpanY;
2688                }
2689
2690                int[] resultSpan = new int[2];
2691                mTargetCell = dropTargetLayout.createArea((int) mDragViewVisualCenter[0],
2692                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2693                        mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2694
2695                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2696
2697                // if the widget resizes on drop
2698                if (foundCell && (cell instanceof AppWidgetHostView) &&
2699                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2700                    resizeOnDrop = true;
2701                    item.spanX = resultSpan[0];
2702                    item.spanY = resultSpan[1];
2703                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2704                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2705                            resultSpan[1]);
2706                }
2707
2708                if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2709                    snapScreen = getPageIndexForScreenId(screenId);
2710                    snapToPage(snapScreen);
2711                }
2712
2713                if (foundCell) {
2714                    final ItemInfo info = (ItemInfo) cell.getTag();
2715                    if (hasMovedLayouts) {
2716                        // Reparent the view
2717                        getParentCellLayoutForView(cell).removeView(cell);
2718                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2719                                info.spanX, info.spanY);
2720                    }
2721
2722                    // update the item's position after drop
2723                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2724                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2725                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2726                    lp.cellHSpan = item.spanX;
2727                    lp.cellVSpan = item.spanY;
2728                    lp.isLockedToGrid = true;
2729                    cell.setId(LauncherModel.getCellLayoutChildId(container, mDragInfo.screenId,
2730                            mTargetCell[0], mTargetCell[1], mDragInfo.spanX, mDragInfo.spanY));
2731
2732                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2733                            cell instanceof LauncherAppWidgetHostView) {
2734                        final CellLayout cellLayout = dropTargetLayout;
2735                        // We post this call so that the widget has a chance to be placed
2736                        // in its final location
2737
2738                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2739                        AppWidgetProviderInfo pinfo = hostView.getAppWidgetInfo();
2740                        if (pinfo != null &&
2741                                pinfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE) {
2742                            final Runnable addResizeFrame = new Runnable() {
2743                                public void run() {
2744                                    DragLayer dragLayer = mLauncher.getDragLayer();
2745                                    dragLayer.addResizeFrame(info, hostView, cellLayout);
2746                                }
2747                            };
2748                            resizeRunnable = (new Runnable() {
2749                                public void run() {
2750                                    if (!isPageMoving()) {
2751                                        addResizeFrame.run();
2752                                    } else {
2753                                        mDelayedResizeRunnable = addResizeFrame;
2754                                    }
2755                                }
2756                            });
2757                        }
2758                    }
2759
2760                    LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, lp.cellX,
2761                            lp.cellY, item.spanX, item.spanY);
2762                } else {
2763                    // If we can't find a drop location, we return the item to its original position
2764                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2765                    mTargetCell[0] = lp.cellX;
2766                    mTargetCell[1] = lp.cellY;
2767                    CellLayout layout = (CellLayout) cell.getParent().getParent();
2768                    layout.markCellsAsOccupiedForView(cell);
2769                }
2770            }
2771
2772            final CellLayout parent = (CellLayout) cell.getParent().getParent();
2773            final Runnable finalResizeRunnable = resizeRunnable;
2774            // Prepare it to be animated into its new position
2775            // This must be called after the view has been re-parented
2776            final Runnable onCompleteRunnable = new Runnable() {
2777                @Override
2778                public void run() {
2779                    mAnimatingViewIntoPlace = false;
2780                    updateChildrenLayersEnabled(false);
2781                    if (finalResizeRunnable != null) {
2782                        finalResizeRunnable.run();
2783                    }
2784                    stripEmptyScreens();
2785                }
2786            };
2787            mAnimatingViewIntoPlace = true;
2788            if (d.dragView.hasDrawn()) {
2789                final ItemInfo info = (ItemInfo) cell.getTag();
2790                if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET) {
2791                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2792                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2793                    animateWidgetDrop(info, parent, d.dragView,
2794                            onCompleteRunnable, animationType, cell, false);
2795                } else {
2796                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2797                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2798                            onCompleteRunnable, this);
2799                }
2800            } else {
2801                d.deferDragViewCleanupPostAnimation = false;
2802                cell.setVisibility(VISIBLE);
2803            }
2804            parent.onDropChild(cell);
2805        }
2806    }
2807
2808    public void setFinalScrollForPageChange(int pageIndex) {
2809        CellLayout cl = (CellLayout) getChildAt(pageIndex);
2810        if (cl != null) {
2811            mSavedScrollX = getScrollX();
2812            mSavedTranslationX = cl.getTranslationX();
2813            mSavedRotationY = cl.getRotationY();
2814            final int newX = getScrollForPage(pageIndex);
2815            setScrollX(newX);
2816            cl.setTranslationX(0f);
2817            cl.setRotationY(0f);
2818        }
2819    }
2820
2821    public void resetFinalScrollForPageChange(int pageIndex) {
2822        if (pageIndex >= 0) {
2823            CellLayout cl = (CellLayout) getChildAt(pageIndex);
2824            setScrollX(mSavedScrollX);
2825            cl.setTranslationX(mSavedTranslationX);
2826            cl.setRotationY(mSavedRotationY);
2827        }
2828    }
2829
2830    public void getViewLocationRelativeToSelf(View v, int[] location) {
2831        getLocationInWindow(location);
2832        int x = location[0];
2833        int y = location[1];
2834
2835        v.getLocationInWindow(location);
2836        int vX = location[0];
2837        int vY = location[1];
2838
2839        location[0] = vX - x;
2840        location[1] = vY - y;
2841    }
2842
2843    public void onDragEnter(DragObject d) {
2844        mDragEnforcer.onDragEnter();
2845        mCreateUserFolderOnDrop = false;
2846        mAddToExistingFolderOnDrop = false;
2847
2848        mDropToLayout = null;
2849        CellLayout layout = getCurrentDropLayout();
2850        setCurrentDropLayout(layout);
2851        setCurrentDragOverlappingLayout(layout);
2852
2853        // Because we don't have space in the Phone UI (the CellLayouts run to the edge) we
2854        // don't need to show the outlines
2855        if (LauncherAppState.getInstance().isScreenLarge()) {
2856            showOutlines();
2857        }
2858    }
2859
2860    /** Return a rect that has the cellWidth/cellHeight (left, top), and
2861     * widthGap/heightGap (right, bottom) */
2862    static Rect getCellLayoutMetrics(Launcher launcher, int orientation) {
2863        LauncherAppState app = LauncherAppState.getInstance();
2864        DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
2865
2866        Resources res = launcher.getResources();
2867        Display display = launcher.getWindowManager().getDefaultDisplay();
2868        Point smallestSize = new Point();
2869        Point largestSize = new Point();
2870        display.getCurrentSizeRange(smallestSize, largestSize);
2871        int countX = (int) grid.numColumns;
2872        int countY = (int) grid.numRows;
2873        int constrainedLongEdge = largestSize.y;
2874        int constrainedShortEdge = smallestSize.y;
2875        if (orientation == CellLayout.LANDSCAPE) {
2876            if (mLandscapeCellLayoutMetrics == null) {
2877                Rect padding = grid.getWorkspacePadding(CellLayout.LANDSCAPE);
2878                int width = constrainedLongEdge - padding.left - padding.right;
2879                int height = constrainedShortEdge - padding.top - padding.bottom;
2880                mLandscapeCellLayoutMetrics = new Rect();
2881                mLandscapeCellLayoutMetrics.set(
2882                        grid.calculateCellWidth(width, countX),
2883                        grid.calculateCellHeight(height, countY), 0, 0);
2884            }
2885            return mLandscapeCellLayoutMetrics;
2886        } else if (orientation == CellLayout.PORTRAIT) {
2887            if (mPortraitCellLayoutMetrics == null) {
2888                Rect padding = grid.getWorkspacePadding(CellLayout.PORTRAIT);
2889                int width = constrainedShortEdge - padding.left - padding.right;
2890                int height = constrainedLongEdge - padding.top - padding.bottom;
2891                mPortraitCellLayoutMetrics = new Rect();
2892                mPortraitCellLayoutMetrics.set(
2893                        grid.calculateCellWidth(width, countX),
2894                        grid.calculateCellHeight(height, countY), 0, 0);
2895            }
2896            return mPortraitCellLayoutMetrics;
2897        }
2898        return null;
2899    }
2900
2901    public void onDragExit(DragObject d) {
2902        mDragEnforcer.onDragExit();
2903
2904        // Here we store the final page that will be dropped to, if the workspace in fact
2905        // receives the drop
2906        if (mInScrollArea) {
2907            if (isPageMoving()) {
2908                // If the user drops while the page is scrolling, we should use that page as the
2909                // destination instead of the page that is being hovered over.
2910                mDropToLayout = (CellLayout) getPageAt(getNextPage());
2911            } else {
2912                mDropToLayout = mDragOverlappingLayout;
2913            }
2914        } else {
2915            mDropToLayout = mDragTargetLayout;
2916        }
2917
2918        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2919            mCreateUserFolderOnDrop = true;
2920        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2921            mAddToExistingFolderOnDrop = true;
2922        }
2923
2924        // Reset the scroll area and previous drag target
2925        onResetScrollArea();
2926        setCurrentDropLayout(null);
2927        setCurrentDragOverlappingLayout(null);
2928
2929        mSpringLoadedDragController.cancel();
2930
2931        if (!mIsPageMoving) {
2932            hideOutlines();
2933        }
2934    }
2935
2936    void setCurrentDropLayout(CellLayout layout) {
2937        if (mDragTargetLayout != null) {
2938            mDragTargetLayout.revertTempState();
2939            mDragTargetLayout.onDragExit();
2940        }
2941        mDragTargetLayout = layout;
2942        if (mDragTargetLayout != null) {
2943            mDragTargetLayout.onDragEnter();
2944        }
2945        cleanupReorder(true);
2946        cleanupFolderCreation();
2947        setCurrentDropOverCell(-1, -1);
2948    }
2949
2950    void setCurrentDragOverlappingLayout(CellLayout layout) {
2951        if (mDragOverlappingLayout != null) {
2952            mDragOverlappingLayout.setIsDragOverlapping(false);
2953        }
2954        mDragOverlappingLayout = layout;
2955        if (mDragOverlappingLayout != null) {
2956            mDragOverlappingLayout.setIsDragOverlapping(true);
2957        }
2958        invalidate();
2959    }
2960
2961    void setCurrentDropOverCell(int x, int y) {
2962        if (x != mDragOverX || y != mDragOverY) {
2963            mDragOverX = x;
2964            mDragOverY = y;
2965            setDragMode(DRAG_MODE_NONE);
2966        }
2967    }
2968
2969    void setDragMode(int dragMode) {
2970        if (dragMode != mDragMode) {
2971            if (dragMode == DRAG_MODE_NONE) {
2972                cleanupAddToFolder();
2973                // We don't want to cancel the re-order alarm every time the target cell changes
2974                // as this feels to slow / unresponsive.
2975                cleanupReorder(false);
2976                cleanupFolderCreation();
2977            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2978                cleanupReorder(true);
2979                cleanupFolderCreation();
2980            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2981                cleanupAddToFolder();
2982                cleanupReorder(true);
2983            } else if (dragMode == DRAG_MODE_REORDER) {
2984                cleanupAddToFolder();
2985                cleanupFolderCreation();
2986            }
2987            mDragMode = dragMode;
2988        }
2989    }
2990
2991    private void cleanupFolderCreation() {
2992        if (mDragFolderRingAnimator != null) {
2993            mDragFolderRingAnimator.animateToNaturalState();
2994        }
2995        mFolderCreationAlarm.cancelAlarm();
2996    }
2997
2998    private void cleanupAddToFolder() {
2999        if (mDragOverFolderIcon != null) {
3000            mDragOverFolderIcon.onDragExit(null);
3001            mDragOverFolderIcon = null;
3002        }
3003    }
3004
3005    private void cleanupReorder(boolean cancelAlarm) {
3006        // Any pending reorders are canceled
3007        if (cancelAlarm) {
3008            mReorderAlarm.cancelAlarm();
3009        }
3010        mLastReorderX = -1;
3011        mLastReorderY = -1;
3012    }
3013
3014   /*
3015    *
3016    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
3017    * coordinate space. The argument xy is modified with the return result.
3018    *
3019    * if cachedInverseMatrix is not null, this method will just use that matrix instead of
3020    * computing it itself; we use this to avoid redundant matrix inversions in
3021    * findMatchingPageForDragOver
3022    *
3023    */
3024   void mapPointFromSelfToChild(View v, float[] xy, Matrix cachedInverseMatrix) {
3025       xy[0] = xy[0] - v.getLeft();
3026       xy[1] = xy[1] - v.getTop();
3027   }
3028
3029   boolean isPointInSelfOverHotseat(int x, int y, Rect r) {
3030       if (r == null) {
3031           r = new Rect();
3032       }
3033       mTempPt[0] = x;
3034       mTempPt[1] = y;
3035       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
3036
3037       LauncherAppState app = LauncherAppState.getInstance();
3038       DeviceProfile grid = app.getDynamicGrid().getDeviceProfile();
3039       r = grid.getHotseatRect();
3040       if (r.contains(mTempPt[0], mTempPt[1])) {
3041           return true;
3042       }
3043       return false;
3044   }
3045
3046   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
3047       mTempPt[0] = (int) xy[0];
3048       mTempPt[1] = (int) xy[1];
3049       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempPt, true);
3050       mLauncher.getDragLayer().mapCoordInSelfToDescendent(hotseat.getLayout(), mTempPt);
3051
3052       xy[0] = mTempPt[0];
3053       xy[1] = mTempPt[1];
3054   }
3055
3056   /*
3057    *
3058    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
3059    * the parent View's coordinate space. The argument xy is modified with the return result.
3060    *
3061    */
3062   void mapPointFromChildToSelf(View v, float[] xy) {
3063       xy[0] += v.getLeft();
3064       xy[1] += v.getTop();
3065   }
3066
3067   static private float squaredDistance(float[] point1, float[] point2) {
3068        float distanceX = point1[0] - point2[0];
3069        float distanceY = point2[1] - point2[1];
3070        return distanceX * distanceX + distanceY * distanceY;
3071   }
3072
3073    /*
3074     *
3075     * This method returns the CellLayout that is currently being dragged to. In order to drag
3076     * to a CellLayout, either the touch point must be directly over the CellLayout, or as a second
3077     * strategy, we see if the dragView is overlapping any CellLayout and choose the closest one
3078     *
3079     * Return null if no CellLayout is currently being dragged over
3080     *
3081     */
3082    private CellLayout findMatchingPageForDragOver(
3083            DragView dragView, float originX, float originY, boolean exact) {
3084        // We loop through all the screens (ie CellLayouts) and see which ones overlap
3085        // with the item being dragged and then choose the one that's closest to the touch point
3086        final int screenCount = getChildCount();
3087        CellLayout bestMatchingScreen = null;
3088        float smallestDistSoFar = Float.MAX_VALUE;
3089
3090        for (int i = 0; i < screenCount; i++) {
3091            // The custom content screen is not a valid drag over option
3092            if (mScreenOrder.get(i) == CUSTOM_CONTENT_SCREEN_ID) {
3093                continue;
3094            }
3095
3096            CellLayout cl = (CellLayout) getChildAt(i);
3097
3098            final float[] touchXy = {originX, originY};
3099            // Transform the touch coordinates to the CellLayout's local coordinates
3100            // If the touch point is within the bounds of the cell layout, we can return immediately
3101            cl.getMatrix().invert(mTempInverseMatrix);
3102            mapPointFromSelfToChild(cl, touchXy, mTempInverseMatrix);
3103
3104            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
3105                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
3106                return cl;
3107            }
3108
3109            if (!exact) {
3110                // Get the center of the cell layout in screen coordinates
3111                final float[] cellLayoutCenter = mTempCellLayoutCenterCoordinates;
3112                cellLayoutCenter[0] = cl.getWidth()/2;
3113                cellLayoutCenter[1] = cl.getHeight()/2;
3114                mapPointFromChildToSelf(cl, cellLayoutCenter);
3115
3116                touchXy[0] = originX;
3117                touchXy[1] = originY;
3118
3119                // Calculate the distance between the center of the CellLayout
3120                // and the touch point
3121                float dist = squaredDistance(touchXy, cellLayoutCenter);
3122
3123                if (dist < smallestDistSoFar) {
3124                    smallestDistSoFar = dist;
3125                    bestMatchingScreen = cl;
3126                }
3127            }
3128        }
3129        return bestMatchingScreen;
3130    }
3131
3132    // This is used to compute the visual center of the dragView. This point is then
3133    // used to visualize drop locations and determine where to drop an item. The idea is that
3134    // the visual center represents the user's interpretation of where the item is, and hence
3135    // is the appropriate point to use when determining drop location.
3136    private float[] getDragViewVisualCenter(int x, int y, int xOffset, int yOffset,
3137            DragView dragView, float[] recycle) {
3138        float res[];
3139        if (recycle == null) {
3140            res = new float[2];
3141        } else {
3142            res = recycle;
3143        }
3144
3145        // First off, the drag view has been shifted in a way that is not represented in the
3146        // x and y values or the x/yOffsets. Here we account for that shift.
3147        x += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetX);
3148        y += getResources().getDimensionPixelSize(R.dimen.dragViewOffsetY);
3149
3150        // These represent the visual top and left of drag view if a dragRect was provided.
3151        // If a dragRect was not provided, then they correspond to the actual view left and
3152        // top, as the dragRect is in that case taken to be the entire dragView.
3153        // R.dimen.dragViewOffsetY.
3154        int left = x - xOffset;
3155        int top = y - yOffset;
3156
3157        // In order to find the visual center, we shift by half the dragRect
3158        res[0] = left + dragView.getDragRegion().width() / 2;
3159        res[1] = top + dragView.getDragRegion().height() / 2;
3160
3161        return res;
3162    }
3163
3164    private boolean isDragWidget(DragObject d) {
3165        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
3166                d.dragInfo instanceof PendingAddWidgetInfo);
3167    }
3168    private boolean isExternalDragWidget(DragObject d) {
3169        return d.dragSource != this && isDragWidget(d);
3170    }
3171
3172    public void onDragOver(DragObject d) {
3173        // Skip drag over events while we are dragging over side pages
3174        if (mInScrollArea || mIsSwitchingState || mState == State.SMALL) return;
3175
3176        Rect r = new Rect();
3177        CellLayout layout = null;
3178        ItemInfo item = (ItemInfo) d.dragInfo;
3179
3180        // Ensure that we have proper spans for the item that we are dropping
3181        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
3182        mDragViewVisualCenter = getDragViewVisualCenter(d.x, d.y, d.xOffset, d.yOffset,
3183            d.dragView, mDragViewVisualCenter);
3184
3185        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
3186        // Identify whether we have dragged over a side page
3187        if (isSmall()) {
3188            if (mLauncher.getHotseat() != null && !isExternalDragWidget(d)) {
3189                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
3190                    layout = mLauncher.getHotseat().getLayout();
3191                }
3192            }
3193            if (layout == null) {
3194                layout = findMatchingPageForDragOver(d.dragView, d.x, d.y, false);
3195            }
3196            if (layout != mDragTargetLayout) {
3197                setCurrentDropLayout(layout);
3198                setCurrentDragOverlappingLayout(layout);
3199
3200                boolean isInSpringLoadedMode = (mState == State.SPRING_LOADED);
3201                if (isInSpringLoadedMode) {
3202                    if (mLauncher.isHotseatLayout(layout)) {
3203                        mSpringLoadedDragController.cancel();
3204                    } else {
3205                        mSpringLoadedDragController.setAlarm(mDragTargetLayout);
3206                    }
3207                }
3208            }
3209        } else {
3210            // Test to see if we are over the hotseat otherwise just use the current page
3211            if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3212                if (isPointInSelfOverHotseat(d.x, d.y, r)) {
3213                    layout = mLauncher.getHotseat().getLayout();
3214                }
3215            }
3216            if (layout == null) {
3217                layout = getCurrentDropLayout();
3218            }
3219            if (layout != mDragTargetLayout) {
3220                setCurrentDropLayout(layout);
3221                setCurrentDragOverlappingLayout(layout);
3222            }
3223        }
3224
3225        // Handle the drag over
3226        if (mDragTargetLayout != null) {
3227            // We want the point to be mapped to the dragTarget.
3228            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
3229                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
3230            } else {
3231                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter, null);
3232            }
3233
3234            ItemInfo info = (ItemInfo) d.dragInfo;
3235
3236            int minSpanX = item.spanX;
3237            int minSpanY = item.spanY;
3238            if (item.minSpanX > 0 && item.minSpanY > 0) {
3239                minSpanX = item.minSpanX;
3240                minSpanY = item.minSpanY;
3241            }
3242
3243            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3244                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY,
3245                    mDragTargetLayout, mTargetCell);
3246            int reorderX = mTargetCell[0];
3247            int reorderY = mTargetCell[1];
3248
3249            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
3250
3251            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
3252                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
3253
3254            final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0],
3255                    mTargetCell[1]);
3256
3257            manageFolderFeedback(info, mDragTargetLayout, mTargetCell,
3258                    targetCellDistance, dragOverView);
3259
3260            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3261                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3262                    item.spanY, child, mTargetCell);
3263
3264            if (!nearestDropOccupied) {
3265                mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3266                        (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3267                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false,
3268                        d.dragView.getDragVisualizeOffset(), d.dragView.getDragRegion());
3269            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3270                    && !mReorderAlarm.alarmPending() && (mLastReorderX != reorderX ||
3271                    mLastReorderY != reorderY)) {
3272
3273                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3274                // reorder, then we schedule a reorder
3275                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3276                        minSpanX, minSpanY, item.spanX, item.spanY, d.dragView, child);
3277                mReorderAlarm.setOnAlarmListener(listener);
3278                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3279            }
3280
3281            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3282                    !nearestDropOccupied) {
3283                if (mDragTargetLayout != null) {
3284                    mDragTargetLayout.revertTempState();
3285                }
3286            }
3287        }
3288    }
3289
3290    private void manageFolderFeedback(ItemInfo info, CellLayout targetLayout,
3291            int[] targetCell, float distance, View dragOverView) {
3292        boolean userFolderPending = willCreateUserFolder(info, targetLayout, targetCell, distance,
3293                false);
3294
3295        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3296                !mFolderCreationAlarm.alarmPending()) {
3297            mFolderCreationAlarm.setOnAlarmListener(new
3298                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]));
3299            mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3300            return;
3301        }
3302
3303        boolean willAddToFolder =
3304                willAddToExistingUserFolder(info, targetLayout, targetCell, distance);
3305
3306        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3307            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3308            mDragOverFolderIcon.onDragEnter(info);
3309            if (targetLayout != null) {
3310                targetLayout.clearDragOutlines();
3311            }
3312            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3313            return;
3314        }
3315
3316        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3317            setDragMode(DRAG_MODE_NONE);
3318        }
3319        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3320            setDragMode(DRAG_MODE_NONE);
3321        }
3322
3323        return;
3324    }
3325
3326    class FolderCreationAlarmListener implements OnAlarmListener {
3327        CellLayout layout;
3328        int cellX;
3329        int cellY;
3330
3331        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3332            this.layout = layout;
3333            this.cellX = cellX;
3334            this.cellY = cellY;
3335        }
3336
3337        public void onAlarm(Alarm alarm) {
3338            if (mDragFolderRingAnimator == null) {
3339                mDragFolderRingAnimator = new FolderRingAnimator(mLauncher, null);
3340            }
3341            mDragFolderRingAnimator.setCell(cellX, cellY);
3342            mDragFolderRingAnimator.setCellLayout(layout);
3343            mDragFolderRingAnimator.animateToAcceptState();
3344            layout.showFolderAccept(mDragFolderRingAnimator);
3345            layout.clearDragOutlines();
3346            setDragMode(DRAG_MODE_CREATE_FOLDER);
3347        }
3348    }
3349
3350    class ReorderAlarmListener implements OnAlarmListener {
3351        float[] dragViewCenter;
3352        int minSpanX, minSpanY, spanX, spanY;
3353        DragView dragView;
3354        View child;
3355
3356        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3357                int spanY, DragView dragView, View child) {
3358            this.dragViewCenter = dragViewCenter;
3359            this.minSpanX = minSpanX;
3360            this.minSpanY = minSpanY;
3361            this.spanX = spanX;
3362            this.spanY = spanY;
3363            this.child = child;
3364            this.dragView = dragView;
3365        }
3366
3367        public void onAlarm(Alarm alarm) {
3368            int[] resultSpan = new int[2];
3369            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3370                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, mDragTargetLayout,
3371                    mTargetCell);
3372            mLastReorderX = mTargetCell[0];
3373            mLastReorderY = mTargetCell[1];
3374
3375            mTargetCell = mDragTargetLayout.createArea((int) mDragViewVisualCenter[0],
3376                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3377                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3378
3379            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3380                mDragTargetLayout.revertTempState();
3381            } else {
3382                setDragMode(DRAG_MODE_REORDER);
3383            }
3384
3385            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3386            mDragTargetLayout.visualizeDropLocation(child, mDragOutline,
3387                (int) mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1],
3388                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize,
3389                dragView.getDragVisualizeOffset(), dragView.getDragRegion());
3390        }
3391    }
3392
3393    @Override
3394    public void getHitRectRelativeToDragLayer(Rect outRect) {
3395        // We want the workspace to have the whole area of the display (it will find the correct
3396        // cell layout to drop to in the existing drag/drop logic.
3397        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3398    }
3399
3400    /**
3401     * Add the item specified by dragInfo to the given layout.
3402     * @return true if successful
3403     */
3404    public boolean addExternalItemToScreen(ItemInfo dragInfo, CellLayout layout) {
3405        if (layout.findCellForSpan(mTempEstimate, dragInfo.spanX, dragInfo.spanY)) {
3406            onDropExternal(dragInfo.dropPos, (ItemInfo) dragInfo, (CellLayout) layout, false);
3407            return true;
3408        }
3409        mLauncher.showOutOfSpaceMessage(mLauncher.isHotseatLayout(layout));
3410        return false;
3411    }
3412
3413    private void onDropExternal(int[] touchXY, Object dragInfo,
3414            CellLayout cellLayout, boolean insertAtFirst) {
3415        onDropExternal(touchXY, dragInfo, cellLayout, insertAtFirst, null);
3416    }
3417
3418    /**
3419     * Drop an item that didn't originate on one of the workspace screens.
3420     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3421     * come from another app altogether.
3422     *
3423     * NOTE: This can also be called when we are outside of a drag event, when we want
3424     * to add an item to one of the workspace screens.
3425     */
3426    private void onDropExternal(final int[] touchXY, final Object dragInfo,
3427            final CellLayout cellLayout, boolean insertAtFirst, DragObject d) {
3428        final Runnable exitSpringLoadedRunnable = new Runnable() {
3429            @Override
3430            public void run() {
3431                mLauncher.exitSpringLoadedDragModeDelayed(true, false, null);
3432            }
3433        };
3434
3435        ItemInfo info = (ItemInfo) dragInfo;
3436        int spanX = info.spanX;
3437        int spanY = info.spanY;
3438        if (mDragInfo != null) {
3439            spanX = mDragInfo.spanX;
3440            spanY = mDragInfo.spanY;
3441        }
3442
3443        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3444                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3445                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3446        final long screenId = getIdForScreen(cellLayout);
3447        if (!mLauncher.isHotseatLayout(cellLayout)
3448                && screenId != getScreenIdForPageIndex(mCurrentPage)
3449                && mState != State.SPRING_LOADED) {
3450            snapToScreenId(screenId, null);
3451        }
3452
3453        if (info instanceof PendingAddItemInfo) {
3454            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) dragInfo;
3455
3456            boolean findNearestVacantCell = true;
3457            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3458                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3459                        cellLayout, mTargetCell);
3460                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3461                        mDragViewVisualCenter[1], mTargetCell);
3462                if (willCreateUserFolder((ItemInfo) d.dragInfo, cellLayout, mTargetCell,
3463                        distance, true) || willAddToExistingUserFolder((ItemInfo) d.dragInfo,
3464                                cellLayout, mTargetCell, distance)) {
3465                    findNearestVacantCell = false;
3466                }
3467            }
3468
3469            final ItemInfo item = (ItemInfo) d.dragInfo;
3470            boolean updateWidgetSize = false;
3471            if (findNearestVacantCell) {
3472                int minSpanX = item.spanX;
3473                int minSpanY = item.spanY;
3474                if (item.minSpanX > 0 && item.minSpanY > 0) {
3475                    minSpanX = item.minSpanX;
3476                    minSpanY = item.minSpanY;
3477                }
3478                int[] resultSpan = new int[2];
3479                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3480                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3481                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3482
3483                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3484                    updateWidgetSize = true;
3485                }
3486                item.spanX = resultSpan[0];
3487                item.spanY = resultSpan[1];
3488            }
3489
3490            Runnable onAnimationCompleteRunnable = new Runnable() {
3491                @Override
3492                public void run() {
3493                    // When dragging and dropping from customization tray, we deal with creating
3494                    // widgets/shortcuts/folders in a slightly different way
3495                    switch (pendingInfo.itemType) {
3496                    case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
3497                        int span[] = new int[2];
3498                        span[0] = item.spanX;
3499                        span[1] = item.spanY;
3500                        mLauncher.addAppWidgetFromDrop((PendingAddWidgetInfo) pendingInfo,
3501                                container, screenId, mTargetCell, span, null);
3502                        break;
3503                    case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3504                        mLauncher.processShortcutFromDrop(pendingInfo.componentName,
3505                                container, screenId, mTargetCell, null);
3506                        break;
3507                    default:
3508                        throw new IllegalStateException("Unknown item type: " +
3509                                pendingInfo.itemType);
3510                    }
3511                }
3512            };
3513            View finalView = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3514                    ? ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3515
3516            if (finalView instanceof AppWidgetHostView && updateWidgetSize) {
3517                AppWidgetHostView awhv = (AppWidgetHostView) finalView;
3518                AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, item.spanX,
3519                        item.spanY);
3520            }
3521
3522            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3523            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET &&
3524                    ((PendingAddWidgetInfo) pendingInfo).info.configure != null) {
3525                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3526            }
3527            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3528                    animationStyle, finalView, true);
3529        } else {
3530            // This is for other drag/drop cases, like dragging from All Apps
3531            View view = null;
3532
3533            switch (info.itemType) {
3534            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3535            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3536                if (info.container == NO_ID && info instanceof AppInfo) {
3537                    // Came from all apps -- make a copy
3538                    info = new ShortcutInfo((AppInfo) info);
3539                }
3540                view = mLauncher.createShortcut(R.layout.application, cellLayout,
3541                        (ShortcutInfo) info);
3542                break;
3543            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3544                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3545                        (FolderInfo) info, mIconCache);
3546                break;
3547            default:
3548                throw new IllegalStateException("Unknown item type: " + info.itemType);
3549            }
3550
3551            // First we find the cell nearest to point at which the item is
3552            // dropped, without any consideration to whether there is an item there.
3553            if (touchXY != null) {
3554                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3555                        cellLayout, mTargetCell);
3556                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3557                        mDragViewVisualCenter[1], mTargetCell);
3558                d.postAnimationRunnable = exitSpringLoadedRunnable;
3559                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3560                        true, d.dragView, d.postAnimationRunnable)) {
3561                    return;
3562                }
3563                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3564                        true)) {
3565                    return;
3566                }
3567            }
3568
3569            if (touchXY != null) {
3570                // when dragging and dropping, just find the closest free spot
3571                mTargetCell = cellLayout.createArea((int) mDragViewVisualCenter[0],
3572                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3573                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3574            } else {
3575                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3576            }
3577            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1], info.spanX,
3578                    info.spanY, insertAtFirst);
3579            cellLayout.onDropChild(view);
3580            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) view.getLayoutParams();
3581            cellLayout.getShortcutsAndWidgets().measureChild(view);
3582
3583            LauncherModel.addOrMoveItemInDatabase(mLauncher, info, container, screenId,
3584                    lp.cellX, lp.cellY);
3585
3586            if (d.dragView != null) {
3587                // We wrap the animation call in the temporary set and reset of the current
3588                // cellLayout to its final transform -- this means we animate the drag view to
3589                // the correct final location.
3590                setFinalTransitionTransform(cellLayout);
3591                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3592                        exitSpringLoadedRunnable);
3593                resetTransitionTransform(cellLayout);
3594            }
3595        }
3596    }
3597
3598    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3599        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo.spanX,
3600                widgetInfo.spanY, widgetInfo, false);
3601        int visibility = layout.getVisibility();
3602        layout.setVisibility(VISIBLE);
3603
3604        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3605        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3606        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3607                Bitmap.Config.ARGB_8888);
3608        Canvas c = new Canvas(b);
3609
3610        layout.measure(width, height);
3611        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3612        layout.draw(c);
3613        c.setBitmap(null);
3614        layout.setVisibility(visibility);
3615        return b;
3616    }
3617
3618    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3619            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell,
3620            boolean external, boolean scale) {
3621        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3622        // location and size on the home screen.
3623        int spanX = info.spanX;
3624        int spanY = info.spanY;
3625
3626        Rect r = estimateItemPosition(layout, info, targetCell[0], targetCell[1], spanX, spanY);
3627        loc[0] = r.left;
3628        loc[1] = r.top;
3629
3630        setFinalTransitionTransform(layout);
3631        float cellLayoutScale =
3632                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3633        resetTransitionTransform(layout);
3634
3635        float dragViewScaleX;
3636        float dragViewScaleY;
3637        if (scale) {
3638            dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3639            dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3640        } else {
3641            dragViewScaleX = 1f;
3642            dragViewScaleY = 1f;
3643        }
3644
3645        // The animation will scale the dragView about its center, so we need to center about
3646        // the final location.
3647        loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2;
3648        loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3649
3650        scaleXY[0] = dragViewScaleX * cellLayoutScale;
3651        scaleXY[1] = dragViewScaleY * cellLayoutScale;
3652    }
3653
3654    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, DragView dragView,
3655            final Runnable onCompleteRunnable, int animationType, final View finalView,
3656            boolean external) {
3657        Rect from = new Rect();
3658        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3659
3660        int[] finalPos = new int[2];
3661        float scaleXY[] = new float[2];
3662        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3663        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3664                external, scalePreview);
3665
3666        Resources res = mLauncher.getResources();
3667        int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3668
3669        // In the case where we've prebound the widget, we remove it from the DragLayer
3670        if (finalView instanceof AppWidgetHostView && external) {
3671            Log.d(TAG, "6557954 Animate widget drop, final view is appWidgetHostView");
3672            mLauncher.getDragLayer().removeView(finalView);
3673        }
3674        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3675            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3676            dragView.setCrossFadeBitmap(crossFadeBitmap);
3677            dragView.crossFade((int) (duration * 0.8f));
3678        } else if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET && external) {
3679            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3680        }
3681
3682        DragLayer dragLayer = mLauncher.getDragLayer();
3683        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3684            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3685                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3686        } else {
3687            int endStyle;
3688            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3689                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3690            } else {
3691                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;;
3692            }
3693
3694            Runnable onComplete = new Runnable() {
3695                @Override
3696                public void run() {
3697                    if (finalView != null) {
3698                        finalView.setVisibility(VISIBLE);
3699                    }
3700                    if (onCompleteRunnable != null) {
3701                        onCompleteRunnable.run();
3702                    }
3703                }
3704            };
3705            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3706                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3707                    duration, this);
3708        }
3709    }
3710
3711    public void setFinalTransitionTransform(CellLayout layout) {
3712        if (isSwitchingState()) {
3713            mCurrentScale = getScaleX();
3714            setScaleX(mNewScale);
3715            setScaleY(mNewScale);
3716        }
3717    }
3718    public void resetTransitionTransform(CellLayout layout) {
3719        if (isSwitchingState()) {
3720            setScaleX(mCurrentScale);
3721            setScaleY(mCurrentScale);
3722        }
3723    }
3724
3725    /**
3726     * Return the current {@link CellLayout}, correctly picking the destination
3727     * screen while a scroll is in progress.
3728     */
3729    public CellLayout getCurrentDropLayout() {
3730        return (CellLayout) getChildAt(getNextPage());
3731    }
3732
3733    /**
3734     * Return the current CellInfo describing our current drag; this method exists
3735     * so that Launcher can sync this object with the correct info when the activity is created/
3736     * destroyed
3737     *
3738     */
3739    public CellLayout.CellInfo getDragInfo() {
3740        return mDragInfo;
3741    }
3742
3743    public int getRestorePage() {
3744        return getNextPage() - numCustomPages();
3745    }
3746
3747    /**
3748     * Calculate the nearest cell where the given object would be dropped.
3749     *
3750     * pixelX and pixelY should be in the coordinate system of layout
3751     */
3752    private int[] findNearestArea(int pixelX, int pixelY,
3753            int spanX, int spanY, CellLayout layout, int[] recycle) {
3754        return layout.findNearestArea(
3755                pixelX, pixelY, spanX, spanY, recycle);
3756    }
3757
3758    void setup(DragController dragController) {
3759        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3760        mDragController = dragController;
3761
3762        // hardware layers on children are enabled on startup, but should be disabled until
3763        // needed
3764        updateChildrenLayersEnabled(false);
3765        setWallpaperDimension();
3766    }
3767
3768    /**
3769     * Called at the end of a drag which originated on the workspace.
3770     */
3771    public void onDropCompleted(final View target, final DragObject d,
3772            final boolean isFlingToDelete, final boolean success) {
3773        if (mDeferDropAfterUninstall) {
3774            mDeferredAction = new Runnable() {
3775                    public void run() {
3776                        onDropCompleted(target, d, isFlingToDelete, success);
3777                        mDeferredAction = null;
3778                    }
3779                };
3780            return;
3781        }
3782
3783        boolean beingCalledAfterUninstall = mDeferredAction != null;
3784
3785        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3786            if (target != this && mDragInfo != null) {
3787                CellLayout parentCell = getParentCellLayoutForView(mDragInfo.cell);
3788                if (parentCell != null) {
3789                    parentCell.removeView(mDragInfo.cell);
3790                }
3791                if (mDragInfo.cell instanceof DropTarget) {
3792                    mDragController.removeDropTarget((DropTarget) mDragInfo.cell);
3793                }
3794                // If we move the item to anything not on the Workspace, check if any empty
3795                // screens need to be removed. If we dropped back on the workspace, this will
3796                // be done post drop animation.
3797                stripEmptyScreens();
3798            }
3799        } else if (mDragInfo != null) {
3800            CellLayout cellLayout;
3801            if (mLauncher.isHotseatLayout(target)) {
3802                cellLayout = mLauncher.getHotseat().getLayout();
3803            } else {
3804                cellLayout = getScreenWithId(mDragInfo.screenId);
3805            }
3806            cellLayout.onDropChild(mDragInfo.cell);
3807        }
3808        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3809                && mDragInfo.cell != null) {
3810            mDragInfo.cell.setVisibility(VISIBLE);
3811        }
3812        mDragOutline = null;
3813        mDragInfo = null;
3814    }
3815
3816    public void deferCompleteDropAfterUninstallActivity() {
3817        mDeferDropAfterUninstall = true;
3818    }
3819
3820    /// maybe move this into a smaller part
3821    public void onUninstallActivityReturned(boolean success) {
3822        mDeferDropAfterUninstall = false;
3823        mUninstallSuccessful = success;
3824        if (mDeferredAction != null) {
3825            mDeferredAction.run();
3826        }
3827    }
3828
3829    void updateItemLocationsInDatabase(CellLayout cl) {
3830        int count = cl.getShortcutsAndWidgets().getChildCount();
3831
3832        long screenId = getIdForScreen(cl);
3833        int container = Favorites.CONTAINER_DESKTOP;
3834
3835        if (mLauncher.isHotseatLayout(cl)) {
3836            screenId = -1;
3837            container = Favorites.CONTAINER_HOTSEAT;
3838        }
3839
3840        for (int i = 0; i < count; i++) {
3841            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3842            ItemInfo info = (ItemInfo) v.getTag();
3843            // Null check required as the AllApps button doesn't have an item info
3844            if (info != null && info.requiresDbUpdate) {
3845                info.requiresDbUpdate = false;
3846                LauncherModel.modifyItemInDatabase(mLauncher, info, container, screenId, info.cellX,
3847                        info.cellY, info.spanX, info.spanY);
3848            }
3849        }
3850    }
3851
3852    ArrayList<ComponentName> getUniqueComponents(boolean stripDuplicates, ArrayList<ComponentName> duplicates) {
3853        ArrayList<ComponentName> uniqueIntents = new ArrayList<ComponentName>();
3854        getUniqueIntents((CellLayout) mLauncher.getHotseat().getLayout(), uniqueIntents, duplicates, false);
3855        int count = getChildCount();
3856        for (int i = 0; i < count; i++) {
3857            CellLayout cl = (CellLayout) getChildAt(i);
3858            getUniqueIntents(cl, uniqueIntents, duplicates, false);
3859        }
3860        return uniqueIntents;
3861    }
3862
3863    void getUniqueIntents(CellLayout cl, ArrayList<ComponentName> uniqueIntents,
3864            ArrayList<ComponentName> duplicates, boolean stripDuplicates) {
3865        int count = cl.getShortcutsAndWidgets().getChildCount();
3866
3867        ArrayList<View> children = new ArrayList<View>();
3868        for (int i = 0; i < count; i++) {
3869            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3870            children.add(v);
3871        }
3872
3873        for (int i = 0; i < count; i++) {
3874            View v = children.get(i);
3875            ItemInfo info = (ItemInfo) v.getTag();
3876            // Null check required as the AllApps button doesn't have an item info
3877            if (info instanceof ShortcutInfo) {
3878                ShortcutInfo si = (ShortcutInfo) info;
3879                ComponentName cn = si.intent.getComponent();
3880
3881                Uri dataUri = si.intent.getData();
3882                // If dataUri is not null / empty or if this component isn't one that would
3883                // have previously showed up in the AllApps list, then this is a widget-type
3884                // shortcut, so ignore it.
3885                if (dataUri != null && !dataUri.equals(Uri.EMPTY)) {
3886                    continue;
3887                }
3888
3889                if (!uniqueIntents.contains(cn)) {
3890                    uniqueIntents.add(cn);
3891                } else {
3892                    if (stripDuplicates) {
3893                        cl.removeViewInLayout(v);
3894                        LauncherModel.deleteItemFromDatabase(mLauncher, si);
3895                    }
3896                    if (duplicates != null) {
3897                        duplicates.add(cn);
3898                    }
3899                }
3900            }
3901            if (v instanceof FolderIcon) {
3902                FolderIcon fi = (FolderIcon) v;
3903                ArrayList<View> items = fi.getFolder().getItemsInReadingOrder();
3904                for (int j = 0; j < items.size(); j++) {
3905                    if (items.get(j).getTag() instanceof ShortcutInfo) {
3906                        ShortcutInfo si = (ShortcutInfo) items.get(j).getTag();
3907                        ComponentName cn = si.intent.getComponent();
3908
3909                        Uri dataUri = si.intent.getData();
3910                        // If dataUri is not null / empty or if this component isn't one that would
3911                        // have previously showed up in the AllApps list, then this is a widget-type
3912                        // shortcut, so ignore it.
3913                        if (dataUri != null && !dataUri.equals(Uri.EMPTY)) {
3914                            continue;
3915                        }
3916
3917                        if (!uniqueIntents.contains(cn)) {
3918                            uniqueIntents.add(cn);
3919                        }  else {
3920                            if (stripDuplicates) {
3921                                fi.getFolderInfo().remove(si);
3922                                LauncherModel.deleteItemFromDatabase(mLauncher, si);
3923                            }
3924                            if (duplicates != null) {
3925                                duplicates.add(cn);
3926                            }
3927                        }
3928                    }
3929                }
3930            }
3931        }
3932    }
3933
3934    void saveWorkspaceToDb() {
3935        saveWorkspaceScreenToDb((CellLayout) mLauncher.getHotseat().getLayout());
3936        int count = getChildCount();
3937        for (int i = 0; i < count; i++) {
3938            CellLayout cl = (CellLayout) getChildAt(i);
3939            saveWorkspaceScreenToDb(cl);
3940        }
3941    }
3942
3943    void saveWorkspaceScreenToDb(CellLayout cl) {
3944        int count = cl.getShortcutsAndWidgets().getChildCount();
3945
3946        long screenId = getIdForScreen(cl);
3947        int container = Favorites.CONTAINER_DESKTOP;
3948
3949        Hotseat hotseat = mLauncher.getHotseat();
3950        if (mLauncher.isHotseatLayout(cl)) {
3951            screenId = -1;
3952            container = Favorites.CONTAINER_HOTSEAT;
3953        }
3954
3955        for (int i = 0; i < count; i++) {
3956            View v = cl.getShortcutsAndWidgets().getChildAt(i);
3957            ItemInfo info = (ItemInfo) v.getTag();
3958            // Null check required as the AllApps button doesn't have an item info
3959            if (info != null) {
3960                int cellX = info.cellX;
3961                int cellY = info.cellY;
3962                if (container == Favorites.CONTAINER_HOTSEAT) {
3963                    cellX = hotseat.getCellXFromOrder((int) info.screenId);
3964                    cellY = hotseat.getCellYFromOrder((int) info.screenId);
3965                }
3966                LauncherModel.addItemToDatabase(mLauncher, info, container, screenId, cellX,
3967                        cellY, false);
3968            }
3969            if (v instanceof FolderIcon) {
3970                FolderIcon fi = (FolderIcon) v;
3971                fi.getFolder().addItemLocationsInDatabase();
3972            }
3973        }
3974    }
3975
3976    @Override
3977    public boolean supportsFlingToDelete() {
3978        return true;
3979    }
3980
3981    @Override
3982    public void onFlingToDelete(DragObject d, int x, int y, PointF vec) {
3983        // Do nothing
3984    }
3985
3986    @Override
3987    public void onFlingToDeleteCompleted() {
3988        // Do nothing
3989    }
3990
3991    public boolean isDropEnabled() {
3992        return true;
3993    }
3994
3995    @Override
3996    protected void onRestoreInstanceState(Parcelable state) {
3997        super.onRestoreInstanceState(state);
3998        Launcher.setScreen(mCurrentPage);
3999    }
4000
4001    @Override
4002    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
4003        // We don't dispatch restoreInstanceState to our children using this code path.
4004        // Some pages will be restored immediately as their items are bound immediately, and
4005        // others we will need to wait until after their items are bound.
4006        mSavedStates = container;
4007    }
4008
4009    public void restoreInstanceStateForChild(int child) {
4010        if (mSavedStates != null) {
4011            mRestoredPages.add(child);
4012            CellLayout cl = (CellLayout) getChildAt(child);
4013            cl.restoreInstanceState(mSavedStates);
4014        }
4015    }
4016
4017    public void restoreInstanceStateForRemainingPages() {
4018        int count = getChildCount();
4019        for (int i = 0; i < count; i++) {
4020            if (!mRestoredPages.contains(i)) {
4021                restoreInstanceStateForChild(i);
4022            }
4023        }
4024        mRestoredPages.clear();
4025    }
4026
4027    @Override
4028    public void scrollLeft() {
4029        if (!isSmall() && !mIsSwitchingState) {
4030            super.scrollLeft();
4031        }
4032        Folder openFolder = getOpenFolder();
4033        if (openFolder != null) {
4034            openFolder.completeDragExit();
4035        }
4036    }
4037
4038    @Override
4039    public void scrollRight() {
4040        if (!isSmall() && !mIsSwitchingState) {
4041            super.scrollRight();
4042        }
4043        Folder openFolder = getOpenFolder();
4044        if (openFolder != null) {
4045            openFolder.completeDragExit();
4046        }
4047    }
4048
4049    @Override
4050    public boolean onEnterScrollArea(int x, int y, int direction) {
4051        // Ignore the scroll area if we are dragging over the hot seat
4052        boolean isPortrait = !LauncherAppState.isScreenLandscape(getContext());
4053        if (mLauncher.getHotseat() != null && isPortrait) {
4054            Rect r = new Rect();
4055            mLauncher.getHotseat().getHitRect(r);
4056            if (r.contains(x, y)) {
4057                return false;
4058            }
4059        }
4060
4061        boolean result = false;
4062        if (!isSmall() && !mIsSwitchingState && getOpenFolder() == null) {
4063            mInScrollArea = true;
4064
4065            final int page = getNextPage() +
4066                       (direction == DragController.SCROLL_LEFT ? -1 : 1);
4067            // We always want to exit the current layout to ensure parity of enter / exit
4068            setCurrentDropLayout(null);
4069
4070            if (0 <= page && page < getChildCount()) {
4071                // Ensure that we are not dragging over to the custom content screen
4072                if (getScreenIdForPageIndex(page) == CUSTOM_CONTENT_SCREEN_ID) {
4073                    return false;
4074                }
4075
4076                CellLayout layout = (CellLayout) getChildAt(page);
4077                setCurrentDragOverlappingLayout(layout);
4078
4079                // Workspace is responsible for drawing the edge glow on adjacent pages,
4080                // so we need to redraw the workspace when this may have changed.
4081                invalidate();
4082                result = true;
4083            }
4084        }
4085        return result;
4086    }
4087
4088    @Override
4089    public boolean onExitScrollArea() {
4090        boolean result = false;
4091        if (mInScrollArea) {
4092            invalidate();
4093            CellLayout layout = getCurrentDropLayout();
4094            setCurrentDropLayout(layout);
4095            setCurrentDragOverlappingLayout(layout);
4096
4097            result = true;
4098            mInScrollArea = false;
4099        }
4100        return result;
4101    }
4102
4103    private void onResetScrollArea() {
4104        setCurrentDragOverlappingLayout(null);
4105        mInScrollArea = false;
4106    }
4107
4108    /**
4109     * Returns a specific CellLayout
4110     */
4111    CellLayout getParentCellLayoutForView(View v) {
4112        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
4113        for (CellLayout layout : layouts) {
4114            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
4115                return layout;
4116            }
4117        }
4118        return null;
4119    }
4120
4121    /**
4122     * Returns a list of all the CellLayouts in the workspace.
4123     */
4124    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
4125        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
4126        int screenCount = getChildCount();
4127        for (int screen = 0; screen < screenCount; screen++) {
4128            layouts.add(((CellLayout) getChildAt(screen)));
4129        }
4130        if (mLauncher.getHotseat() != null) {
4131            layouts.add(mLauncher.getHotseat().getLayout());
4132        }
4133        return layouts;
4134    }
4135
4136    /**
4137     * We should only use this to search for specific children.  Do not use this method to modify
4138     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
4139     * the hotseat and workspace pages
4140     */
4141    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
4142        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4143                new ArrayList<ShortcutAndWidgetContainer>();
4144        int screenCount = getChildCount();
4145        for (int screen = 0; screen < screenCount; screen++) {
4146            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
4147        }
4148        if (mLauncher.getHotseat() != null) {
4149            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
4150        }
4151        return childrenLayouts;
4152    }
4153
4154    public Folder getFolderForTag(Object tag) {
4155        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4156                getAllShortcutAndWidgetContainers();
4157        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4158            int count = layout.getChildCount();
4159            for (int i = 0; i < count; i++) {
4160                View child = layout.getChildAt(i);
4161                if (child instanceof Folder) {
4162                    Folder f = (Folder) child;
4163                    if (f.getInfo() == tag && f.getInfo().opened) {
4164                        return f;
4165                    }
4166                }
4167            }
4168        }
4169        return null;
4170    }
4171
4172    public View getViewForTag(Object tag) {
4173        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4174                getAllShortcutAndWidgetContainers();
4175        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4176            int count = layout.getChildCount();
4177            for (int i = 0; i < count; i++) {
4178                View child = layout.getChildAt(i);
4179                if (child.getTag() == tag) {
4180                    return child;
4181                }
4182            }
4183        }
4184        return null;
4185    }
4186
4187    void clearDropTargets() {
4188        ArrayList<ShortcutAndWidgetContainer> childrenLayouts =
4189                getAllShortcutAndWidgetContainers();
4190        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4191            int childCount = layout.getChildCount();
4192            for (int j = 0; j < childCount; j++) {
4193                View v = layout.getChildAt(j);
4194                if (v instanceof DropTarget) {
4195                    mDragController.removeDropTarget((DropTarget) v);
4196                }
4197            }
4198        }
4199    }
4200
4201    // Removes ALL items that match a given package name, this is usually called when a package
4202    // has been removed and we want to remove all components (widgets, shortcuts, apps) that
4203    // belong to that package.
4204    void removeItemsByPackageName(final ArrayList<String> packages) {
4205        final HashSet<String> packageNames = new HashSet<String>();
4206        packageNames.addAll(packages);
4207
4208        // Filter out all the ItemInfos that this is going to affect
4209        final HashSet<ItemInfo> infos = new HashSet<ItemInfo>();
4210        final HashSet<ComponentName> cns = new HashSet<ComponentName>();
4211        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
4212        for (CellLayout layoutParent : cellLayouts) {
4213            ViewGroup layout = layoutParent.getShortcutsAndWidgets();
4214            int childCount = layout.getChildCount();
4215            for (int i = 0; i < childCount; ++i) {
4216                View view = layout.getChildAt(i);
4217                infos.add((ItemInfo) view.getTag());
4218            }
4219        }
4220        LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
4221            @Override
4222            public boolean filterItem(ItemInfo parent, ItemInfo info,
4223                                      ComponentName cn) {
4224                if (packageNames.contains(cn.getPackageName())) {
4225                    cns.add(cn);
4226                    return true;
4227                }
4228                return false;
4229            }
4230        };
4231        LauncherModel.filterItemInfos(infos, filter);
4232
4233        // Remove the affected components
4234        removeItemsByComponentName(cns);
4235    }
4236
4237    // Removes items that match the application info specified, when applications are removed
4238    // as a part of an update, this is called to ensure that other widgets and application
4239    // shortcuts are not removed.
4240    void removeItemsByApplicationInfo(final ArrayList<AppInfo> appInfos) {
4241        // Just create a hash table of all the specific components that this will affect
4242        HashSet<ComponentName> cns = new HashSet<ComponentName>();
4243        for (AppInfo info : appInfos) {
4244            cns.add(info.componentName);
4245        }
4246
4247        // Remove all the things
4248        removeItemsByComponentName(cns);
4249    }
4250
4251    void removeItemsByComponentName(final HashSet<ComponentName> componentNames) {
4252        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
4253        for (final CellLayout layoutParent: cellLayouts) {
4254            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
4255
4256            final HashMap<ItemInfo, View> children = new HashMap<ItemInfo, View>();
4257            for (int j = 0; j < layout.getChildCount(); j++) {
4258                final View view = layout.getChildAt(j);
4259                children.put((ItemInfo) view.getTag(), view);
4260            }
4261
4262            final ArrayList<View> childrenToRemove = new ArrayList<View>();
4263            final HashMap<FolderInfo, ArrayList<ShortcutInfo>> folderAppsToRemove =
4264                    new HashMap<FolderInfo, ArrayList<ShortcutInfo>>();
4265            LauncherModel.ItemInfoFilter filter = new LauncherModel.ItemInfoFilter() {
4266                @Override
4267                public boolean filterItem(ItemInfo parent, ItemInfo info,
4268                                          ComponentName cn) {
4269                    if (parent instanceof FolderInfo) {
4270                        if (componentNames.contains(cn)) {
4271                            FolderInfo folder = (FolderInfo) parent;
4272                            ArrayList<ShortcutInfo> appsToRemove;
4273                            if (folderAppsToRemove.containsKey(folder)) {
4274                                appsToRemove = folderAppsToRemove.get(folder);
4275                            } else {
4276                                appsToRemove = new ArrayList<ShortcutInfo>();
4277                                folderAppsToRemove.put(folder, appsToRemove);
4278                            }
4279                            appsToRemove.add((ShortcutInfo) info);
4280                            return true;
4281                        }
4282                    } else {
4283                        if (componentNames.contains(cn)) {
4284                            childrenToRemove.add(children.get(info));
4285                            return true;
4286                        }
4287                    }
4288                    return false;
4289                }
4290            };
4291            LauncherModel.filterItemInfos(children.keySet(), filter);
4292
4293            // Remove all the apps from their folders
4294            for (FolderInfo folder : folderAppsToRemove.keySet()) {
4295                ArrayList<ShortcutInfo> appsToRemove = folderAppsToRemove.get(folder);
4296                for (ShortcutInfo info : appsToRemove) {
4297                    folder.remove(info);
4298                }
4299            }
4300
4301            // Remove all the other children
4302            for (View child : childrenToRemove) {
4303                // Note: We can not remove the view directly from CellLayoutChildren as this
4304                // does not re-mark the spaces as unoccupied.
4305                layoutParent.removeViewInLayout(child);
4306                if (child instanceof DropTarget) {
4307                    mDragController.removeDropTarget((DropTarget) child);
4308                }
4309            }
4310
4311            if (childrenToRemove.size() > 0) {
4312                layout.requestLayout();
4313                layout.invalidate();
4314            }
4315        }
4316
4317        // Strip all the empty screens
4318        stripEmptyScreens();
4319    }
4320
4321    void updateShortcuts(ArrayList<AppInfo> apps) {
4322        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = getAllShortcutAndWidgetContainers();
4323        for (ShortcutAndWidgetContainer layout: childrenLayouts) {
4324            int childCount = layout.getChildCount();
4325            for (int j = 0; j < childCount; j++) {
4326                final View view = layout.getChildAt(j);
4327                Object tag = view.getTag();
4328
4329                if (LauncherModel.isShortcutInfoUpdateable((ItemInfo) tag)) {
4330                    ShortcutInfo info = (ShortcutInfo) tag;
4331
4332                    final Intent intent = info.intent;
4333                    final ComponentName name = intent.getComponent();
4334                    final int appCount = apps.size();
4335                    for (int k = 0; k < appCount; k++) {
4336                        AppInfo app = apps.get(k);
4337                        if (app.componentName.equals(name)) {
4338                            BubbleTextView shortcut = (BubbleTextView) view;
4339                            info.updateIcon(mIconCache);
4340                            info.title = app.title.toString();
4341                            shortcut.applyFromShortcutInfo(info, mIconCache);
4342                        }
4343                    }
4344                }
4345            }
4346        }
4347    }
4348
4349    private void moveToScreen(int page, boolean animate) {
4350        if (!isSmall()) {
4351            if (animate) {
4352                snapToPage(page);
4353            } else {
4354                setCurrentPage(page);
4355            }
4356        }
4357        View child = getChildAt(page);
4358        if (child != null) {
4359            child.requestFocus();
4360        }
4361    }
4362
4363    void moveToDefaultScreen(boolean animate) {
4364        moveToScreen(mDefaultPage, animate);
4365    }
4366
4367    void moveToCustomContentScreen(boolean animate) {
4368        if (hasCustomContent()) {
4369            int ccIndex = getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID);
4370            if (animate) {
4371                snapToPage(ccIndex);
4372            } else {
4373                setCurrentPage(ccIndex);
4374            }
4375            View child = getChildAt(ccIndex);
4376            if (child != null) {
4377                child.requestFocus();
4378            }
4379         }
4380    }
4381
4382    @Override
4383    protected PageIndicator.PageMarkerResources getPageIndicatorMarker(int pageIndex) {
4384        long screenId = getScreenIdForPageIndex(pageIndex);
4385        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
4386            int count = mScreenOrder.size() - numCustomPages();
4387            if (count > 1) {
4388                return new PageIndicator.PageMarkerResources(R.drawable.ic_pageindicator_current,
4389                        R.drawable.ic_pageindicator_add);
4390            }
4391        }
4392
4393        return super.getPageIndicatorMarker(pageIndex);
4394    }
4395
4396    @Override
4397    public void syncPages() {
4398    }
4399
4400    @Override
4401    public void syncPageItems(int page, boolean immediate) {
4402    }
4403
4404    protected String getPageIndicatorDescription() {
4405        String settings = getResources().getString(R.string.settings_button_text);
4406        return getCurrentPageDescription() + ", " + settings;
4407    }
4408
4409    protected String getCurrentPageDescription() {
4410        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4411        int delta = numCustomPages();
4412        if (hasCustomContent() && getNextPage() == 0) {
4413            return mCustomContentDescription;
4414        }
4415        return String.format(getContext().getString(R.string.workspace_scroll_format),
4416                page + 1 - delta, getChildCount() - delta);
4417    }
4418
4419    public void getLocationInDragLayer(int[] loc) {
4420        mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
4421    }
4422}
4423