Workspace.java revision aa6f66aad29171bda85e0633c93530beefdac307 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.launcher3;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.LayoutTransition;
23import android.animation.ObjectAnimator;
24import android.animation.PropertyValuesHolder;
25import android.animation.ValueAnimator;
26import android.animation.ValueAnimator.AnimatorUpdateListener;
27import android.annotation.SuppressLint;
28import android.app.WallpaperManager;
29import android.appwidget.AppWidgetHostView;
30import android.appwidget.AppWidgetProviderInfo;
31import android.content.Context;
32import android.content.res.Resources;
33import android.graphics.Bitmap;
34import android.graphics.Canvas;
35import android.graphics.Point;
36import android.graphics.Rect;
37import android.graphics.drawable.Drawable;
38import android.os.Handler;
39import android.os.IBinder;
40import android.os.Parcelable;
41import android.os.UserHandle;
42import android.util.AttributeSet;
43import android.util.Log;
44import android.util.Property;
45import android.util.SparseArray;
46import android.view.MotionEvent;
47import android.view.View;
48import android.view.ViewDebug;
49import android.view.ViewGroup;
50import android.view.accessibility.AccessibilityManager;
51import android.view.animation.DecelerateInterpolator;
52import android.view.animation.Interpolator;
53import android.widget.TextView;
54import android.widget.Toast;
55
56import com.android.launcher3.Launcher.CustomContentCallbacks;
57import com.android.launcher3.Launcher.LauncherOverlay;
58import com.android.launcher3.UninstallDropTarget.DropTargetSource;
59import com.android.launcher3.accessibility.AccessibleDragListenerAdapter;
60import com.android.launcher3.accessibility.OverviewAccessibilityDelegate;
61import com.android.launcher3.accessibility.OverviewScreenAccessibilityDelegate;
62import com.android.launcher3.accessibility.WorkspaceAccessibilityHelper;
63import com.android.launcher3.anim.AnimationLayerSet;
64import com.android.launcher3.badge.FolderBadgeInfo;
65import com.android.launcher3.compat.AppWidgetManagerCompat;
66import com.android.launcher3.config.FeatureFlags;
67import com.android.launcher3.config.ProviderConfig;
68import com.android.launcher3.dragndrop.DragController;
69import com.android.launcher3.dragndrop.DragLayer;
70import com.android.launcher3.dragndrop.DragOptions;
71import com.android.launcher3.dragndrop.DragView;
72import com.android.launcher3.dragndrop.SpringLoadedDragController;
73import com.android.launcher3.folder.Folder;
74import com.android.launcher3.folder.FolderIcon;
75import com.android.launcher3.graphics.DragPreviewProvider;
76import com.android.launcher3.graphics.PreloadIconDrawable;
77import com.android.launcher3.popup.PopupContainerWithArrow;
78import com.android.launcher3.shortcuts.ShortcutDragPreviewProvider;
79import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
80import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
81import com.android.launcher3.util.ItemInfoMatcher;
82import com.android.launcher3.util.LongArrayMap;
83import com.android.launcher3.util.MultiStateAlphaController;
84import com.android.launcher3.util.PackageUserKey;
85import com.android.launcher3.util.Thunk;
86import com.android.launcher3.util.VerticalFlingDetector;
87import com.android.launcher3.util.WallpaperOffsetInterpolator;
88import com.android.launcher3.widget.PendingAddShortcutInfo;
89import com.android.launcher3.widget.PendingAddWidgetInfo;
90
91import java.util.ArrayList;
92import java.util.HashSet;
93import java.util.Set;
94
95/**
96 * The workspace is a wide area with a wallpaper and a finite number of pages.
97 * Each page contains a number of icons, folders or widgets the user can
98 * interact with. A workspace is meant to be used with a fixed width only.
99 */
100public class Workspace extends PagedView
101        implements DropTarget, DragSource, View.OnTouchListener,
102        DragController.DragListener, ViewGroup.OnHierarchyChangeListener,
103        Insettable, DropTargetSource {
104    private static final String TAG = "Launcher.Workspace";
105
106    /** The value that {@link #mTransitionProgress} must be greater than for
107     * {@link #transitionStateShouldAllowDrop()} to return true. */
108    private static final float ALLOW_DROP_TRANSITION_PROGRESS = 0.25f;
109
110    /** The value that {@link #mTransitionProgress} must be greater than for
111     * {@link #isFinishedSwitchingState()} ()} to return true. */
112    private static final float FINISHED_SWITCHING_STATE_TRANSITION_PROGRESS = 0.5f;
113
114    private static boolean ENFORCE_DRAG_EVENT_ORDER = false;
115
116    private static final int SNAP_OFF_EMPTY_SCREEN_DURATION = 400;
117    private static final int FADE_EMPTY_SCREEN_DURATION = 150;
118
119    private static final int ADJACENT_SCREEN_DROP_DURATION = 300;
120
121    private static final boolean MAP_NO_RECURSE = false;
122    private static final boolean MAP_RECURSE = true;
123
124    // The screen id used for the empty screen always present to the right.
125    public static final long EXTRA_EMPTY_SCREEN_ID = -201;
126    // The is the first screen. It is always present, even if its empty.
127    public static final long FIRST_SCREEN_ID = 0;
128
129    private final static long CUSTOM_CONTENT_SCREEN_ID = -301;
130
131    private static final long CUSTOM_CONTENT_GESTURE_DELAY = 200;
132    private long mTouchDownTime = -1;
133    private long mCustomContentShowTime = -1;
134
135    private LayoutTransition mLayoutTransition;
136    @Thunk final WallpaperManager mWallpaperManager;
137
138    private ShortcutAndWidgetContainer mDragSourceInternal;
139
140    @Thunk LongArrayMap<CellLayout> mWorkspaceScreens = new LongArrayMap<>();
141    @Thunk ArrayList<Long> mScreenOrder = new ArrayList<Long>();
142
143    @Thunk Runnable mRemoveEmptyScreenRunnable;
144    @Thunk boolean mDeferRemoveExtraEmptyScreen = false;
145
146    /**
147     * CellInfo for the cell that is currently being dragged
148     */
149    private CellLayout.CellInfo mDragInfo;
150
151    /**
152     * Target drop area calculated during last acceptDrop call.
153     */
154    @Thunk int[] mTargetCell = new int[2];
155    private int mDragOverX = -1;
156    private int mDragOverY = -1;
157
158    CustomContentCallbacks mCustomContentCallbacks;
159    boolean mCustomContentShowing;
160    private float mLastCustomContentScrollProgress = -1f;
161    private String mCustomContentDescription = "";
162
163    /**
164     * The CellLayout that is currently being dragged over
165     */
166    @Thunk CellLayout mDragTargetLayout = null;
167    /**
168     * The CellLayout that we will show as highlighted
169     */
170    private CellLayout mDragOverlappingLayout = null;
171
172    /**
173     * The CellLayout which will be dropped to
174     */
175    private CellLayout mDropToLayout = null;
176
177    @Thunk Launcher mLauncher;
178    @Thunk DragController mDragController;
179
180    // These are temporary variables to prevent having to allocate a new object just to
181    // return an (x, y) value from helper functions. Do NOT use them to maintain other state.
182    private static final Rect sTempRect = new Rect();
183
184    private final int[] mTempXY = new int[2];
185    @Thunk float[] mDragViewVisualCenter = new float[2];
186    private float[] mTempTouchCoordinates = new float[2];
187
188    private SpringLoadedDragController mSpringLoadedDragController;
189    private float mOverviewModeShrinkFactor;
190
191    // State variable that indicates whether the pages are small (ie when you're
192    // in all apps or customize mode)
193
194    public enum State {
195        NORMAL          (false, false, ContainerType.WORKSPACE),
196        NORMAL_HIDDEN   (false, false, ContainerType.ALLAPPS),
197        SPRING_LOADED   (false, true, ContainerType.WORKSPACE),
198        OVERVIEW        (true, true, ContainerType.OVERVIEW),
199        OVERVIEW_HIDDEN (true, false, ContainerType.WIDGETS);
200
201        public final boolean shouldUpdateWidget;
202        public final boolean hasMultipleVisiblePages;
203        public final int containerType;
204
205        State(boolean shouldUpdateWidget, boolean hasMultipleVisiblePages, int containerType) {
206            this.shouldUpdateWidget = shouldUpdateWidget;
207            this.hasMultipleVisiblePages = hasMultipleVisiblePages;
208            this.containerType = containerType;
209        }
210    }
211
212    // Direction used for moving the workspace and hotseat UI
213    public enum Direction {
214        X  (TRANSLATION_X),
215        Y  (TRANSLATION_Y);
216
217        private final Property<View, Float> viewProperty;
218
219        Direction(Property<View, Float> viewProperty) {
220            this.viewProperty = viewProperty;
221        }
222    }
223
224    private static final int HOTSEAT_STATE_ALPHA_INDEX = 2;
225
226    /**
227     * These values correspond to {@link Direction#X} & {@link Direction#Y}
228     */
229    private float[] mPageAlpha = new float[] {1, 1};
230    /**
231     * Hotseat alpha can be changed when moving horizontally, vertically, changing states.
232     * The values correspond to {@link Direction#X}, {@link Direction#Y} &
233     * {@link #HOTSEAT_STATE_ALPHA_INDEX} respectively.
234     */
235    private float[] mHotseatAlpha = new float[] {1, 1, 1};
236
237    public static final int QSB_ALPHA_INDEX_STATE_CHANGE = 0;
238    public static final int QSB_ALPHA_INDEX_Y_TRANSLATION = 1;
239    public static final int QSB_ALPHA_INDEX_PAGE_SCROLL = 2;
240    public static final int QSB_ALPHA_INDEX_OVERLAY_SCROLL = 3;
241
242
243    MultiStateAlphaController mQsbAlphaController;
244
245    @ViewDebug.ExportedProperty(category = "launcher")
246    private State mState = State.NORMAL;
247    private boolean mIsSwitchingState = false;
248
249    boolean mAnimatingViewIntoPlace = false;
250    boolean mChildrenLayersEnabled = true;
251
252    private boolean mStripScreensOnPageStopMoving = false;
253
254    private DragPreviewProvider mOutlineProvider = null;
255    private boolean mWorkspaceFadeInAdjacentScreens;
256
257    final WallpaperOffsetInterpolator mWallpaperOffset;
258    private boolean mUnlockWallpaperFromDefaultPageOnLayout;
259
260    @Thunk Runnable mDelayedResizeRunnable;
261    private Runnable mDelayedSnapToPageRunnable;
262
263    // Variables relating to the creation of user folders by hovering shortcuts over shortcuts
264    private static final int FOLDER_CREATION_TIMEOUT = 0;
265    public static final int REORDER_TIMEOUT = 350;
266    private final Alarm mFolderCreationAlarm = new Alarm();
267    private final Alarm mReorderAlarm = new Alarm();
268    private FolderIcon.PreviewBackground mFolderCreateBg;
269    private FolderIcon mDragOverFolderIcon = null;
270    private boolean mCreateUserFolderOnDrop = false;
271    private boolean mAddToExistingFolderOnDrop = false;
272    private float mMaxDistanceForFolderCreation;
273
274    private final Canvas mCanvas = new Canvas();
275
276    // Variables relating to touch disambiguation (scrolling workspace vs. scrolling a widget)
277    private float mXDown;
278    private float mYDown;
279    final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
280    final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
281    final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
282
283    // Relating to the animation of items being dropped externally
284    public static final int ANIMATE_INTO_POSITION_AND_DISAPPEAR = 0;
285    public static final int ANIMATE_INTO_POSITION_AND_REMAIN = 1;
286    public static final int ANIMATE_INTO_POSITION_AND_RESIZE = 2;
287    public static final int COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION = 3;
288    public static final int CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION = 4;
289
290    // Related to dragging, folder creation and reordering
291    private static final int DRAG_MODE_NONE = 0;
292    private static final int DRAG_MODE_CREATE_FOLDER = 1;
293    private static final int DRAG_MODE_ADD_TO_FOLDER = 2;
294    private static final int DRAG_MODE_REORDER = 3;
295    private int mDragMode = DRAG_MODE_NONE;
296    @Thunk int mLastReorderX = -1;
297    @Thunk int mLastReorderY = -1;
298
299    private SparseArray<Parcelable> mSavedStates;
300    private final ArrayList<Integer> mRestoredPages = new ArrayList<Integer>();
301
302    private float mCurrentScale;
303    private float mTransitionProgress;
304
305    @Thunk Runnable mDeferredAction;
306    private boolean mDeferDropAfterUninstall;
307    private boolean mUninstallSuccessful;
308
309    // State related to Launcher Overlay
310    LauncherOverlay mLauncherOverlay;
311    boolean mScrollInteractionBegan;
312    boolean mStartedSendingScrollEvents;
313    float mLastOverlayScroll = 0;
314    // Total over scrollX in the overlay direction.
315    private int mUnboundedScrollX;
316    private boolean mForceDrawAdjacentPages = false;
317    // Total over scrollX in the overlay direction.
318    private float mOverlayTranslation;
319    private int mFirstPageScrollX;
320    private boolean mIgnoreQsbScroll;
321
322    // Handles workspace state transitions
323    private WorkspaceStateTransitionAnimation mStateTransitionAnimation;
324
325    private AccessibilityDelegate mPagesAccessibilityDelegate;
326    private OnStateChangeListener mOnStateChangeListener;
327
328    /**
329     * Used to inflate the Workspace from XML.
330     *
331     * @param context The application's context.
332     * @param attrs The attributes set containing the Workspace's customization values.
333     */
334    public Workspace(Context context, AttributeSet attrs) {
335        this(context, attrs, 0);
336    }
337
338    /**
339     * Used to inflate the Workspace from XML.
340     *
341     * @param context The application's context.
342     * @param attrs The attributes set containing the Workspace's customization values.
343     * @param defStyle Unused.
344     */
345    public Workspace(Context context, AttributeSet attrs, int defStyle) {
346        super(context, attrs, defStyle);
347
348        mLauncher = Launcher.getLauncher(context);
349        mStateTransitionAnimation = new WorkspaceStateTransitionAnimation(mLauncher, this);
350        final Resources res = getResources();
351        DeviceProfile grid = mLauncher.getDeviceProfile();
352        mWorkspaceFadeInAdjacentScreens = grid.shouldFadeAdjacentWorkspaceScreens();
353        mWallpaperManager = WallpaperManager.getInstance(context);
354
355        mWallpaperOffset = new WallpaperOffsetInterpolator(this);
356        mOverviewModeShrinkFactor =
357                res.getInteger(R.integer.config_workspaceOverviewShrinkPercentage) / 100f;
358
359        setOnHierarchyChangeListener(this);
360        setHapticFeedbackEnabled(false);
361
362        initWorkspace();
363
364        // Disable multitouch across the workspace/all apps/customize tray
365        setMotionEventSplittingEnabled(true);
366    }
367
368    @Override
369    public void setInsets(Rect insets) {
370        mInsets.set(insets);
371
372        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
373        if (customScreen != null) {
374            View customContent = customScreen.getShortcutsAndWidgets().getChildAt(0);
375            if (customContent instanceof Insettable) {
376                ((Insettable) customContent).setInsets(mInsets);
377            }
378        }
379    }
380
381    public void setOnStateChangeListener(OnStateChangeListener listener) {
382        mOnStateChangeListener = listener;
383    }
384
385    /**
386     * Estimates the size of an item using spans: hSpan, vSpan.
387     *
388     * @param springLoaded True if we are in spring loaded mode.
389     * @param unscaledSize True if caller wants to return the unscaled size
390     * @return MAX_VALUE for each dimension if unsuccessful.
391     */
392    public int[] estimateItemSize(ItemInfo itemInfo, boolean springLoaded, boolean unscaledSize) {
393        float shrinkFactor = mLauncher.getDeviceProfile().workspaceSpringLoadShrinkFactor;
394        int[] size = new int[2];
395        if (getChildCount() > 0) {
396            // Use the first non-custom page to estimate the child position
397            CellLayout cl = (CellLayout) getChildAt(numCustomPages());
398            boolean isWidget = itemInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET;
399
400            Rect r = estimateItemPosition(cl, 0, 0, itemInfo.spanX, itemInfo.spanY);
401
402            float scale = 1;
403            if (isWidget) {
404                DeviceProfile profile = mLauncher.getDeviceProfile();
405                scale = Utilities.shrinkRect(r, profile.appWidgetScale.x, profile.appWidgetScale.y);
406            }
407            size[0] = r.width();
408            size[1] = r.height();
409
410            if (isWidget && unscaledSize) {
411                size[0] /= scale;
412                size[1] /= scale;
413            }
414
415            if (springLoaded) {
416                size[0] *= shrinkFactor;
417                size[1] *= shrinkFactor;
418            }
419            return size;
420        } else {
421            size[0] = Integer.MAX_VALUE;
422            size[1] = Integer.MAX_VALUE;
423            return size;
424        }
425    }
426
427    public Rect estimateItemPosition(CellLayout cl, int hCell, int vCell, int hSpan, int vSpan) {
428        Rect r = new Rect();
429        cl.cellToRect(hCell, vCell, hSpan, vSpan, r);
430        return r;
431    }
432
433    @Override
434    public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
435        if (ENFORCE_DRAG_EVENT_ORDER) {
436            enforceDragParity("onDragStart", 0, 0);
437        }
438
439        if (mDragInfo != null && mDragInfo.cell != null) {
440            CellLayout layout = (CellLayout) mDragInfo.cell.getParent().getParent();
441            layout.markCellsAsUnoccupiedForView(mDragInfo.cell);
442        }
443
444        if (mOutlineProvider != null) {
445            // The outline is used to visualize where the item will land if dropped
446            mOutlineProvider.generateDragOutline(mCanvas);
447        }
448
449        updateChildrenLayersEnabled(false);
450        mLauncher.onDragStarted();
451        mLauncher.lockScreenOrientation();
452        mLauncher.onInteractionBegin();
453        // Prevent any Un/InstallShortcutReceivers from updating the db while we are dragging
454        InstallShortcutReceiver.enableInstallQueue();
455
456        // Do not add a new page if it is a accessible drag which was not started by the workspace.
457        // We do not support accessibility drag from other sources and instead provide a direct
458        // action for move/add to homescreen.
459        // When a accessible drag is started by the folder, we only allow rearranging withing the
460        // folder.
461        boolean addNewPage = !(options.isAccessibleDrag && dragObject.dragSource != this);
462
463        if (addNewPage) {
464            mDeferRemoveExtraEmptyScreen = false;
465            addExtraEmptyScreenOnDrag();
466
467            if (dragObject.dragInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
468                    && dragObject.dragSource != this) {
469                // When dragging a widget from different source, move to a page which has
470                // enough space to place this widget (after rearranging/resizing). We special case
471                // widgets as they cannot be placed inside a folder.
472                // Start at the current page and search right (on LTR) until finding a page with
473                // enough space. Since an empty screen is the furthest right, a page must be found.
474                int currentPage = getPageNearestToCenterOfScreen();
475                for (int pageIndex = currentPage; pageIndex < getPageCount(); pageIndex++) {
476                    CellLayout page = (CellLayout) getPageAt(pageIndex);
477                    if (page.hasReorderSolution(dragObject.dragInfo)) {
478                        setCurrentPage(pageIndex);
479                        break;
480                    }
481                }
482            }
483        }
484
485        // Always enter the spring loaded mode
486        mLauncher.enterSpringLoadedDragMode();
487    }
488
489    public void deferRemoveExtraEmptyScreen() {
490        mDeferRemoveExtraEmptyScreen = true;
491    }
492
493    @Override
494    public void onDragEnd() {
495        if (ENFORCE_DRAG_EVENT_ORDER) {
496            enforceDragParity("onDragEnd", 0, 0);
497        }
498
499        if (!mDeferRemoveExtraEmptyScreen) {
500            removeExtraEmptyScreen(true, mDragSourceInternal != null);
501        }
502
503        updateChildrenLayersEnabled(false);
504        mLauncher.unlockScreenOrientation(false);
505
506        // Re-enable any Un/InstallShortcutReceiver and now process any queued items
507        InstallShortcutReceiver.disableAndFlushInstallQueue(getContext());
508
509        mOutlineProvider = null;
510        mDragInfo = null;
511        mDragSourceInternal = null;
512        mLauncher.onInteractionEnd();
513    }
514
515    /**
516     * Initializes various states for this workspace.
517     */
518    protected void initWorkspace() {
519        mCurrentPage = getDefaultPage();
520        DeviceProfile grid = mLauncher.getDeviceProfile();
521        setWillNotDraw(false);
522        setClipChildren(false);
523        setClipToPadding(false);
524
525        setMinScale(mOverviewModeShrinkFactor);
526        setupLayoutTransition();
527
528        mMaxDistanceForFolderCreation = (0.55f * grid.iconSizePx);
529
530        // Set the wallpaper dimensions when Launcher starts up
531        setWallpaperDimension();
532
533        setEdgeGlowColor(getResources().getColor(R.color.workspace_edge_effect_color));
534    }
535
536    @Override
537    public void initParentViews(View parent) {
538        super.initParentViews(parent);
539        mPageIndicator.setAccessibilityDelegate(new OverviewAccessibilityDelegate());
540        mQsbAlphaController = new MultiStateAlphaController(mLauncher.getQsbContainer(), 4);
541    }
542
543    private int getDefaultPage() {
544        return numCustomPages();
545    }
546
547    private void setupLayoutTransition() {
548        // We want to show layout transitions when pages are deleted, to close the gap.
549        mLayoutTransition = new LayoutTransition();
550        mLayoutTransition.enableTransitionType(LayoutTransition.DISAPPEARING);
551        mLayoutTransition.enableTransitionType(LayoutTransition.CHANGE_DISAPPEARING);
552        mLayoutTransition.disableTransitionType(LayoutTransition.APPEARING);
553        mLayoutTransition.disableTransitionType(LayoutTransition.CHANGE_APPEARING);
554        setLayoutTransition(mLayoutTransition);
555    }
556
557    void enableLayoutTransitions() {
558        setLayoutTransition(mLayoutTransition);
559    }
560    void disableLayoutTransitions() {
561        setLayoutTransition(null);
562    }
563
564    @Override
565    public void onChildViewAdded(View parent, View child) {
566        if (!(child instanceof CellLayout)) {
567            throw new IllegalArgumentException("A Workspace can only have CellLayout children.");
568        }
569        CellLayout cl = ((CellLayout) child);
570        cl.setOnInterceptTouchListener(this);
571        cl.setClickable(true);
572        cl.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
573        super.onChildViewAdded(parent, child);
574    }
575
576    boolean isTouchActive() {
577        return mTouchState != TOUCH_STATE_REST;
578    }
579
580    private int getEmbeddedQsbId() {
581        return mLauncher.getDeviceProfile().isVerticalBarLayout()
582                ? R.id.qsb_container : R.id.workspace_blocked_row;
583    }
584
585    /**
586     * Initializes and binds the first page
587     * @param qsb an existing qsb to recycle or null.
588     */
589    public void bindAndInitFirstWorkspaceScreen(View qsb) {
590        if (!FeatureFlags.QSB_ON_FIRST_SCREEN) {
591            return;
592        }
593        // Add the first page
594        CellLayout firstPage = insertNewWorkspaceScreen(Workspace.FIRST_SCREEN_ID, 0);
595        if (FeatureFlags.PULLDOWN_SEARCH) {
596            firstPage.setOnTouchListener(new VerticalFlingDetector(mLauncher) {
597                // detect fling when touch started from empty space
598                @Override
599                public boolean onTouch(View v, MotionEvent ev) {
600                    if (workspaceInModalState()) return false;
601                    if (shouldConsumeTouch(v)) return true;
602                    if (super.onTouch(v, ev)) {
603                        mLauncher.startSearch("", false, null, false);
604                        return true;
605                    }
606                    return false;
607                }
608            });
609            firstPage.setOnInterceptTouchListener(new VerticalFlingDetector(mLauncher) {
610                // detect fling when touch started from on top of the icons
611                @Override
612                public boolean onTouch(View v, MotionEvent ev) {
613                    if (shouldConsumeTouch(v)) return true;
614                    if (super.onTouch(v, ev)) {
615                        mLauncher.startSearch("", false, null, false);
616                        return true;
617                    }
618                    return false;
619                }
620            });
621        }
622        // Always add a QSB on the first screen.
623        if (qsb == null) {
624            // In transposed layout, we add the QSB in the Grid. As workspace does not touch the
625            // edges, we do not need a full width QSB.
626            qsb = mLauncher.getLayoutInflater().inflate(
627                    mLauncher.getDeviceProfile().isVerticalBarLayout()
628                            ? R.layout.qsb_container : R.layout.qsb_blocker_view,
629                    firstPage, false);
630        }
631
632        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, firstPage.getCountX(), 1);
633        lp.canReorder = false;
634        if (!firstPage.addViewToCellLayout(qsb, 0, getEmbeddedQsbId(), lp, true)) {
635            Log.e(TAG, "Failed to add to item at (0, 0) to CellLayout");
636        }
637    }
638
639    @Override
640    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
641        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
642
643        // Update the QSB to match the cell height. This is treating the QSB essentially as a child
644        // of workspace despite that it's not a true child.
645        // Note that it relies on the strict ordering of measuring the workspace before the QSB
646        // at the dragLayer level.
647        // Only measure the QSB when the view is enabled
648        if (FeatureFlags.QSB_ON_FIRST_SCREEN && getChildCount() > 0) {
649            CellLayout firstPage = (CellLayout) getChildAt(0);
650            int cellHeight = firstPage.getCellHeight();
651
652            View qsbContainer = mLauncher.getQsbContainer();
653            ViewGroup.LayoutParams lp = qsbContainer.getLayoutParams();
654            if (cellHeight > 0 && lp.height != cellHeight) {
655                lp.height = cellHeight;
656                qsbContainer.setLayoutParams(lp);
657            }
658        }
659    }
660
661    public void removeAllWorkspaceScreens() {
662        // Disable all layout transitions before removing all pages to ensure that we don't get the
663        // transition animations competing with us changing the scroll when we add pages or the
664        // custom content screen
665        disableLayoutTransitions();
666
667        // Since we increment the current page when we call addCustomContentPage via bindScreens
668        // (and other places), we need to adjust the current page back when we clear the pages
669        if (hasCustomContent()) {
670            removeCustomContentPage();
671        }
672
673        // Recycle the QSB widget
674        View qsb = findViewById(getEmbeddedQsbId());
675        if (qsb != null) {
676            ((ViewGroup) qsb.getParent()).removeView(qsb);
677        }
678
679        // Remove the pages and clear the screen models
680        removeAllViews();
681        mScreenOrder.clear();
682        mWorkspaceScreens.clear();
683
684        // Ensure that the first page is always present
685        bindAndInitFirstWorkspaceScreen(qsb);
686
687        // Re-enable the layout transitions
688        enableLayoutTransitions();
689    }
690
691    public void insertNewWorkspaceScreenBeforeEmptyScreen(long screenId) {
692        // Find the index to insert this view into.  If the empty screen exists, then
693        // insert it before that.
694        int insertIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
695        if (insertIndex < 0) {
696            insertIndex = mScreenOrder.size();
697        }
698        insertNewWorkspaceScreen(screenId, insertIndex);
699    }
700
701    public void insertNewWorkspaceScreen(long screenId) {
702        insertNewWorkspaceScreen(screenId, getChildCount());
703    }
704
705    public CellLayout insertNewWorkspaceScreen(long screenId, int insertIndex) {
706        if (mWorkspaceScreens.containsKey(screenId)) {
707            throw new RuntimeException("Screen id " + screenId + " already exists!");
708        }
709
710        // Inflate the cell layout, but do not add it automatically so that we can get the newly
711        // created CellLayout.
712        CellLayout newScreen = (CellLayout) mLauncher.getLayoutInflater().inflate(
713                        R.layout.workspace_screen, this, false /* attachToRoot */);
714        newScreen.setOnLongClickListener(mLongClickListener);
715        newScreen.setOnClickListener(mLauncher);
716        newScreen.setSoundEffectsEnabled(false);
717        mWorkspaceScreens.put(screenId, newScreen);
718        mScreenOrder.add(insertIndex, screenId);
719        addView(newScreen, insertIndex);
720
721        if (mLauncher.getAccessibilityDelegate().isInAccessibleDrag()) {
722            newScreen.enableAccessibleDrag(true, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
723        }
724
725        return newScreen;
726    }
727
728    public void createCustomContentContainer() {
729        CellLayout customScreen = (CellLayout)
730                mLauncher.getLayoutInflater().inflate(R.layout.workspace_screen, this, false);
731        customScreen.disableDragTarget();
732        customScreen.disableJailContent();
733
734        mWorkspaceScreens.put(CUSTOM_CONTENT_SCREEN_ID, customScreen);
735        mScreenOrder.add(0, CUSTOM_CONTENT_SCREEN_ID);
736
737        // We want no padding on the custom content
738        customScreen.setPadding(0, 0, 0, 0);
739
740        addFullScreenPage(customScreen);
741
742        // Update the custom content hint
743        setCurrentPage(getCurrentPage() + 1);
744    }
745
746    public void removeCustomContentPage() {
747        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
748        if (customScreen == null) {
749            throw new RuntimeException("Expected custom content screen to exist");
750        }
751
752        mWorkspaceScreens.remove(CUSTOM_CONTENT_SCREEN_ID);
753        mScreenOrder.remove(CUSTOM_CONTENT_SCREEN_ID);
754        removeView(customScreen);
755
756        if (mCustomContentCallbacks != null) {
757            mCustomContentCallbacks.onScrollProgressChanged(0);
758            mCustomContentCallbacks.onHide();
759        }
760
761        mCustomContentCallbacks = null;
762
763        // Update the custom content hint
764        setCurrentPage(getCurrentPage() - 1);
765    }
766
767    public void addToCustomContentPage(View customContent, CustomContentCallbacks callbacks,
768            String description) {
769        if (getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID) < 0) {
770            throw new RuntimeException("Expected custom content screen to exist");
771        }
772
773        // Add the custom content to the full screen custom page
774        CellLayout customScreen = getScreenWithId(CUSTOM_CONTENT_SCREEN_ID);
775        int spanX = customScreen.getCountX();
776        int spanY = customScreen.getCountY();
777        CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, spanX, spanY);
778        lp.canReorder  = false;
779        lp.isFullscreen = true;
780        if (customContent instanceof Insettable) {
781            ((Insettable)customContent).setInsets(mInsets);
782        }
783
784        // Verify that the child is removed from any existing parent.
785        if (customContent.getParent() instanceof ViewGroup) {
786            ViewGroup parent = (ViewGroup) customContent.getParent();
787            parent.removeView(customContent);
788        }
789        customScreen.removeAllViews();
790        customContent.setFocusable(true);
791        customContent.setOnKeyListener(new FullscreenKeyEventListener());
792        customContent.setOnFocusChangeListener(mLauncher.mFocusHandler
793                .getHideIndicatorOnFocusListener());
794        customScreen.addViewToCellLayout(customContent, 0, 0, lp, true);
795        mCustomContentDescription = description;
796
797        mCustomContentCallbacks = callbacks;
798    }
799
800    public void addExtraEmptyScreenOnDrag() {
801        boolean lastChildOnScreen = false;
802        boolean childOnFinalScreen = false;
803
804        // Cancel any pending removal of empty screen
805        mRemoveEmptyScreenRunnable = null;
806
807        if (mDragSourceInternal != null) {
808            if (mDragSourceInternal.getChildCount() == 1) {
809                lastChildOnScreen = true;
810            }
811            CellLayout cl = (CellLayout) mDragSourceInternal.getParent();
812            if (indexOfChild(cl) == getChildCount() - 1) {
813                childOnFinalScreen = true;
814            }
815        }
816
817        // If this is the last item on the final screen
818        if (lastChildOnScreen && childOnFinalScreen) {
819            return;
820        }
821        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
822            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
823        }
824    }
825
826    public boolean addExtraEmptyScreen() {
827        if (!mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID)) {
828            insertNewWorkspaceScreen(EXTRA_EMPTY_SCREEN_ID);
829            return true;
830        }
831        return false;
832    }
833
834    private void convertFinalScreenToEmptyScreenIfNecessary() {
835        if (mLauncher.isWorkspaceLoading()) {
836            // Invalid and dangerous operation if workspace is loading
837            return;
838        }
839
840        if (hasExtraEmptyScreen() || mScreenOrder.size() == 0) return;
841        long finalScreenId = mScreenOrder.get(mScreenOrder.size() - 1);
842
843        if (finalScreenId == CUSTOM_CONTENT_SCREEN_ID) return;
844        CellLayout finalScreen = mWorkspaceScreens.get(finalScreenId);
845
846        // If the final screen is empty, convert it to the extra empty screen
847        if (finalScreen.getShortcutsAndWidgets().getChildCount() == 0 &&
848                !finalScreen.isDropPending()) {
849            mWorkspaceScreens.remove(finalScreenId);
850            mScreenOrder.remove(finalScreenId);
851
852            // if this is the last non-custom content screen, convert it to the empty screen
853            mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, finalScreen);
854            mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
855
856            // Update the model if we have changed any screens
857            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
858        }
859    }
860
861    public void removeExtraEmptyScreen(final boolean animate, boolean stripEmptyScreens) {
862        removeExtraEmptyScreenDelayed(animate, null, 0, stripEmptyScreens);
863    }
864
865    public void removeExtraEmptyScreenDelayed(final boolean animate, final Runnable onComplete,
866            final int delay, final boolean stripEmptyScreens) {
867        if (mLauncher.isWorkspaceLoading()) {
868            // Don't strip empty screens if the workspace is still loading
869            return;
870        }
871
872        if (delay > 0) {
873            postDelayed(new Runnable() {
874                @Override
875                public void run() {
876                    removeExtraEmptyScreenDelayed(animate, onComplete, 0, stripEmptyScreens);
877                }
878            }, delay);
879            return;
880        }
881
882        convertFinalScreenToEmptyScreenIfNecessary();
883        if (hasExtraEmptyScreen()) {
884            int emptyIndex = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
885            if (getNextPage() == emptyIndex) {
886                snapToPage(getNextPage() - 1, SNAP_OFF_EMPTY_SCREEN_DURATION);
887                fadeAndRemoveEmptyScreen(SNAP_OFF_EMPTY_SCREEN_DURATION, FADE_EMPTY_SCREEN_DURATION,
888                        onComplete, stripEmptyScreens);
889            } else {
890                snapToPage(getNextPage(), 0);
891                fadeAndRemoveEmptyScreen(0, FADE_EMPTY_SCREEN_DURATION,
892                        onComplete, stripEmptyScreens);
893            }
894            return;
895        } else if (stripEmptyScreens) {
896            // If we're not going to strip the empty screens after removing
897            // the extra empty screen, do it right away.
898            stripEmptyScreens();
899        }
900
901        if (onComplete != null) {
902            onComplete.run();
903        }
904    }
905
906    private void fadeAndRemoveEmptyScreen(int delay, int duration, final Runnable onComplete,
907            final boolean stripEmptyScreens) {
908        // XXX: Do we need to update LM workspace screens below?
909        PropertyValuesHolder alpha = PropertyValuesHolder.ofFloat("alpha", 0f);
910        PropertyValuesHolder bgAlpha = PropertyValuesHolder.ofFloat("backgroundAlpha", 0f);
911
912        final CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
913
914        mRemoveEmptyScreenRunnable = new Runnable() {
915            @Override
916            public void run() {
917                if (hasExtraEmptyScreen()) {
918                    mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
919                    mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
920                    removeView(cl);
921                    if (stripEmptyScreens) {
922                        stripEmptyScreens();
923                    }
924                    // Update the page indicator to reflect the removed page.
925                    showPageIndicatorAtCurrentScroll();
926                }
927            }
928        };
929
930        ObjectAnimator oa = ObjectAnimator.ofPropertyValuesHolder(cl, alpha, bgAlpha);
931        oa.setDuration(duration);
932        oa.setStartDelay(delay);
933        oa.addListener(new AnimatorListenerAdapter() {
934            @Override
935            public void onAnimationEnd(Animator animation) {
936                if (mRemoveEmptyScreenRunnable != null) {
937                    mRemoveEmptyScreenRunnable.run();
938                }
939                if (onComplete != null) {
940                    onComplete.run();
941                }
942            }
943        });
944        oa.start();
945    }
946
947    public boolean hasExtraEmptyScreen() {
948        int nScreens = getChildCount();
949        nScreens = nScreens - numCustomPages();
950        return mWorkspaceScreens.containsKey(EXTRA_EMPTY_SCREEN_ID) && nScreens > 1;
951    }
952
953    public long commitExtraEmptyScreen() {
954        if (mLauncher.isWorkspaceLoading()) {
955            // Invalid and dangerous operation if workspace is loading
956            return -1;
957        }
958
959        int index = getPageIndexForScreenId(EXTRA_EMPTY_SCREEN_ID);
960        CellLayout cl = mWorkspaceScreens.get(EXTRA_EMPTY_SCREEN_ID);
961        mWorkspaceScreens.remove(EXTRA_EMPTY_SCREEN_ID);
962        mScreenOrder.remove(EXTRA_EMPTY_SCREEN_ID);
963
964        long newId = LauncherSettings.Settings.call(getContext().getContentResolver(),
965                LauncherSettings.Settings.METHOD_NEW_SCREEN_ID)
966                .getLong(LauncherSettings.Settings.EXTRA_VALUE);
967        mWorkspaceScreens.put(newId, cl);
968        mScreenOrder.add(newId);
969
970        // Update the model for the new screen
971        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
972
973        return newId;
974    }
975
976    public CellLayout getScreenWithId(long screenId) {
977        return mWorkspaceScreens.get(screenId);
978    }
979
980    public long getIdForScreen(CellLayout layout) {
981        int index = mWorkspaceScreens.indexOfValue(layout);
982        if (index != -1) {
983            return mWorkspaceScreens.keyAt(index);
984        }
985        return -1;
986    }
987
988    public int getPageIndexForScreenId(long screenId) {
989        return indexOfChild(mWorkspaceScreens.get(screenId));
990    }
991
992    public long getScreenIdForPageIndex(int index) {
993        if (0 <= index && index < mScreenOrder.size()) {
994            return mScreenOrder.get(index);
995        }
996        return -1;
997    }
998
999    public ArrayList<Long> getScreenOrder() {
1000        return mScreenOrder;
1001    }
1002
1003    public void stripEmptyScreens() {
1004        if (mLauncher.isWorkspaceLoading()) {
1005            // Don't strip empty screens if the workspace is still loading.
1006            // This is dangerous and can result in data loss.
1007            return;
1008        }
1009
1010        if (isPageInTransition()) {
1011            mStripScreensOnPageStopMoving = true;
1012            return;
1013        }
1014
1015        int currentPage = getNextPage();
1016        ArrayList<Long> removeScreens = new ArrayList<Long>();
1017        int total = mWorkspaceScreens.size();
1018        for (int i = 0; i < total; i++) {
1019            long id = mWorkspaceScreens.keyAt(i);
1020            CellLayout cl = mWorkspaceScreens.valueAt(i);
1021            // FIRST_SCREEN_ID can never be removed.
1022            if ((!FeatureFlags.QSB_ON_FIRST_SCREEN || id > FIRST_SCREEN_ID)
1023                    && cl.getShortcutsAndWidgets().getChildCount() == 0) {
1024                removeScreens.add(id);
1025            }
1026        }
1027
1028        boolean isInAccessibleDrag = mLauncher.getAccessibilityDelegate().isInAccessibleDrag();
1029
1030        // We enforce at least one page to add new items to. In the case that we remove the last
1031        // such screen, we convert the last screen to the empty screen
1032        int minScreens = 1 + numCustomPages();
1033
1034        int pageShift = 0;
1035        for (Long id: removeScreens) {
1036            CellLayout cl = mWorkspaceScreens.get(id);
1037            mWorkspaceScreens.remove(id);
1038            mScreenOrder.remove(id);
1039
1040            if (getChildCount() > minScreens) {
1041                if (indexOfChild(cl) < currentPage) {
1042                    pageShift++;
1043                }
1044
1045                if (isInAccessibleDrag) {
1046                    cl.enableAccessibleDrag(false, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG);
1047                }
1048
1049                removeView(cl);
1050            } else {
1051                // if this is the last non-custom content screen, convert it to the empty screen
1052                mRemoveEmptyScreenRunnable = null;
1053                mWorkspaceScreens.put(EXTRA_EMPTY_SCREEN_ID, cl);
1054                mScreenOrder.add(EXTRA_EMPTY_SCREEN_ID);
1055            }
1056        }
1057
1058        if (!removeScreens.isEmpty()) {
1059            // Update the model if we have changed any screens
1060            mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1061        }
1062
1063        if (pageShift >= 0) {
1064            setCurrentPage(currentPage - pageShift);
1065        }
1066    }
1067
1068    /**
1069     * At bind time, we use the rank (screenId) to compute x and y for hotseat items.
1070     * See {@link #addInScreen}.
1071     */
1072    public void addInScreenFromBind(View child, ItemInfo info) {
1073        int x = info.cellX;
1074        int y = info.cellY;
1075        if (info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
1076            int screenId = (int) info.screenId;
1077            x = mLauncher.getHotseat().getCellXFromOrder(screenId);
1078            y = mLauncher.getHotseat().getCellYFromOrder(screenId);
1079        }
1080        addInScreen(child, info.container, info.screenId, x, y, info.spanX, info.spanY);
1081    }
1082
1083    /**
1084     * Adds the specified child in the specified screen based on the {@param info}
1085     * See {@link #addInScreen}.
1086     */
1087    public void addInScreen(View child, ItemInfo info) {
1088        addInScreen(child, info.container, info.screenId, info.cellX, info.cellY,
1089                info.spanX, info.spanY);
1090    }
1091
1092    /**
1093     * Adds the specified child in the specified screen. The position and dimension of
1094     * the child are defined by x, y, spanX and spanY.
1095     *
1096     * @param child The child to add in one of the workspace's screens.
1097     * @param screenId The screen in which to add the child.
1098     * @param x The X position of the child in the screen's grid.
1099     * @param y The Y position of the child in the screen's grid.
1100     * @param spanX The number of cells spanned horizontally by the child.
1101     * @param spanY The number of cells spanned vertically by the child.
1102     */
1103    private void addInScreen(View child, long container, long screenId, int x, int y,
1104            int spanX, int spanY) {
1105        if (container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
1106            if (getScreenWithId(screenId) == null) {
1107                Log.e(TAG, "Skipping child, screenId " + screenId + " not found");
1108                // DEBUGGING - Print out the stack trace to see where we are adding from
1109                new Throwable().printStackTrace();
1110                return;
1111            }
1112        }
1113        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
1114            // This should never happen
1115            throw new RuntimeException("Screen id should not be EXTRA_EMPTY_SCREEN_ID");
1116        }
1117
1118        final CellLayout layout;
1119        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
1120            layout = mLauncher.getHotseat().getLayout();
1121            child.setOnKeyListener(new HotseatIconKeyEventListener());
1122
1123            // Hide folder title in the hotseat
1124            if (child instanceof FolderIcon) {
1125                ((FolderIcon) child).setTextVisible(false);
1126            }
1127        } else {
1128            // Show folder title if not in the hotseat
1129            if (child instanceof FolderIcon) {
1130                ((FolderIcon) child).setTextVisible(true);
1131            }
1132            layout = getScreenWithId(screenId);
1133            child.setOnKeyListener(new IconKeyEventListener());
1134        }
1135
1136        ViewGroup.LayoutParams genericLp = child.getLayoutParams();
1137        CellLayout.LayoutParams lp;
1138        if (genericLp == null || !(genericLp instanceof CellLayout.LayoutParams)) {
1139            lp = new CellLayout.LayoutParams(x, y, spanX, spanY);
1140        } else {
1141            lp = (CellLayout.LayoutParams) genericLp;
1142            lp.cellX = x;
1143            lp.cellY = y;
1144            lp.cellHSpan = spanX;
1145            lp.cellVSpan = spanY;
1146        }
1147
1148        if (spanX < 0 && spanY < 0) {
1149            lp.isLockedToGrid = false;
1150        }
1151
1152        // Get the canonical child id to uniquely represent this view in this screen
1153        ItemInfo info = (ItemInfo) child.getTag();
1154        int childId = mLauncher.getViewIdForItem(info);
1155
1156        boolean markCellsAsOccupied = !(child instanceof Folder);
1157        if (!layout.addViewToCellLayout(child, -1, childId, lp, markCellsAsOccupied)) {
1158            // TODO: This branch occurs when the workspace is adding views
1159            // outside of the defined grid
1160            // maybe we should be deleting these items from the LauncherModel?
1161            Log.e(TAG, "Failed to add to item at (" + lp.cellX + "," + lp.cellY + ") to CellLayout");
1162        }
1163
1164        if (!(child instanceof Folder)) {
1165            child.setHapticFeedbackEnabled(false);
1166            child.setOnLongClickListener(mLongClickListener);
1167        }
1168        if (child instanceof DropTarget) {
1169            mDragController.addDropTarget((DropTarget) child);
1170        }
1171    }
1172
1173    /**
1174     * Called directly from a CellLayout (not by the framework), after we've been added as a
1175     * listener via setOnInterceptTouchEventListener(). This allows us to tell the CellLayout
1176     * that it should intercept touch events, which is not something that is normally supported.
1177     */
1178    @SuppressLint("ClickableViewAccessibility")
1179    @Override
1180    public boolean onTouch(View v, MotionEvent event) {
1181        return shouldConsumeTouch(v);
1182    }
1183
1184    private boolean shouldConsumeTouch(View v) {
1185        return !workspaceIconsCanBeDragged()
1186                || (!workspaceInModalState() && indexOfChild(v) != mCurrentPage);
1187    }
1188
1189    public boolean isSwitchingState() {
1190        return mIsSwitchingState;
1191    }
1192
1193    /** This differs from isSwitchingState in that we take into account how far the transition
1194     *  has completed. */
1195    public boolean isFinishedSwitchingState() {
1196        return !mIsSwitchingState
1197                || (mTransitionProgress > FINISHED_SWITCHING_STATE_TRANSITION_PROGRESS);
1198    }
1199
1200    protected void onWindowVisibilityChanged (int visibility) {
1201        mLauncher.onWindowVisibilityChanged(visibility);
1202    }
1203
1204    @Override
1205    public boolean dispatchUnhandledMove(View focused, int direction) {
1206        if (workspaceInModalState() || !isFinishedSwitchingState()) {
1207            // when the home screens are shrunken, shouldn't allow side-scrolling
1208            return false;
1209        }
1210        return super.dispatchUnhandledMove(focused, direction);
1211    }
1212
1213    @Override
1214    public boolean onInterceptTouchEvent(MotionEvent ev) {
1215        switch (ev.getAction() & MotionEvent.ACTION_MASK) {
1216        case MotionEvent.ACTION_DOWN:
1217            mXDown = ev.getX();
1218            mYDown = ev.getY();
1219            mTouchDownTime = System.currentTimeMillis();
1220            break;
1221        case MotionEvent.ACTION_POINTER_UP:
1222        case MotionEvent.ACTION_UP:
1223            if (mTouchState == TOUCH_STATE_REST) {
1224                final CellLayout currentPage = (CellLayout) getChildAt(mCurrentPage);
1225                if (currentPage != null) {
1226                    onWallpaperTap(ev);
1227                }
1228            }
1229        }
1230        return super.onInterceptTouchEvent(ev);
1231    }
1232
1233    @Override
1234    public boolean onGenericMotionEvent(MotionEvent event) {
1235        // Ignore pointer scroll events if the custom content doesn't allow scrolling.
1236        if ((getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID)
1237                && (mCustomContentCallbacks != null)
1238                && !mCustomContentCallbacks.isScrollingAllowed()) {
1239            return false;
1240        }
1241        return super.onGenericMotionEvent(event);
1242    }
1243
1244    protected void reinflateWidgetsIfNecessary() {
1245        final int clCount = getChildCount();
1246        for (int i = 0; i < clCount; i++) {
1247            CellLayout cl = (CellLayout) getChildAt(i);
1248            ShortcutAndWidgetContainer swc = cl.getShortcutsAndWidgets();
1249            final int itemCount = swc.getChildCount();
1250            for (int j = 0; j < itemCount; j++) {
1251                View v = swc.getChildAt(j);
1252
1253                if (v instanceof LauncherAppWidgetHostView
1254                        && v.getTag() instanceof LauncherAppWidgetInfo) {
1255                    LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
1256                    LauncherAppWidgetHostView lahv = (LauncherAppWidgetHostView) v;
1257                    if (lahv.isReinflateRequired()) {
1258                        // Remove and rebind the current widget (which was inflated in the wrong
1259                        // orientation), but don't delete it from the database
1260                        mLauncher.removeItem(lahv, info, false  /* deleteFromDb */);
1261                        mLauncher.bindAppWidget(info);
1262                    }
1263                }
1264            }
1265        }
1266    }
1267
1268    @Override
1269    protected void determineScrollingStart(MotionEvent ev) {
1270        if (!isFinishedSwitchingState()) return;
1271
1272        float deltaX = ev.getX() - mXDown;
1273        float absDeltaX = Math.abs(deltaX);
1274        float absDeltaY = Math.abs(ev.getY() - mYDown);
1275
1276        if (Float.compare(absDeltaX, 0f) == 0) return;
1277
1278        float slope = absDeltaY / absDeltaX;
1279        float theta = (float) Math.atan(slope);
1280
1281        if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
1282            cancelCurrentPageLongPress();
1283        }
1284
1285        boolean passRightSwipesToCustomContent =
1286                (mTouchDownTime - mCustomContentShowTime) > CUSTOM_CONTENT_GESTURE_DELAY;
1287
1288        boolean swipeInIgnoreDirection = mIsRtl ? deltaX < 0 : deltaX > 0;
1289        boolean onCustomContentScreen =
1290                getScreenIdForPageIndex(getCurrentPage()) == CUSTOM_CONTENT_SCREEN_ID;
1291        if (swipeInIgnoreDirection && onCustomContentScreen && passRightSwipesToCustomContent) {
1292            // Pass swipes to the right to the custom content page.
1293            return;
1294        }
1295
1296        if (onCustomContentScreen && (mCustomContentCallbacks != null)
1297                && !mCustomContentCallbacks.isScrollingAllowed()) {
1298            // Don't allow workspace scrolling if the current custom content screen doesn't allow
1299            // scrolling.
1300            return;
1301        }
1302
1303        if (theta > MAX_SWIPE_ANGLE) {
1304            // Above MAX_SWIPE_ANGLE, we don't want to ever start scrolling the workspace
1305            return;
1306        } else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
1307            // Above START_DAMPING_TOUCH_SLOP_ANGLE and below MAX_SWIPE_ANGLE, we want to
1308            // increase the touch slop to make it harder to begin scrolling the workspace. This
1309            // results in vertically scrolling widgets to more easily. The higher the angle, the
1310            // more we increase touch slop.
1311            theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
1312            float extraRatio = (float)
1313                    Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
1314            super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
1315        } else {
1316            // Below START_DAMPING_TOUCH_SLOP_ANGLE, we don't do anything special
1317            super.determineScrollingStart(ev);
1318        }
1319    }
1320
1321    protected void onPageBeginTransition() {
1322        super.onPageBeginTransition();
1323        updateChildrenLayersEnabled(false);
1324    }
1325
1326    protected void onPageEndTransition() {
1327        super.onPageEndTransition();
1328        updateChildrenLayersEnabled(false);
1329
1330        if (mDragController.isDragging()) {
1331            if (workspaceInModalState()) {
1332                // If we are in springloaded mode, then force an event to check if the current touch
1333                // is under a new page (to scroll to)
1334                mDragController.forceTouchMove();
1335            }
1336        }
1337
1338        if (mDelayedResizeRunnable != null && !mIsSwitchingState) {
1339            mDelayedResizeRunnable.run();
1340            mDelayedResizeRunnable = null;
1341        }
1342
1343        if (mDelayedSnapToPageRunnable != null) {
1344            mDelayedSnapToPageRunnable.run();
1345            mDelayedSnapToPageRunnable = null;
1346        }
1347        if (mStripScreensOnPageStopMoving) {
1348            stripEmptyScreens();
1349            mStripScreensOnPageStopMoving = false;
1350        }
1351    }
1352
1353    protected void onScrollInteractionBegin() {
1354        super.onScrollInteractionEnd();
1355        mScrollInteractionBegan = true;
1356    }
1357
1358    protected void onScrollInteractionEnd() {
1359        super.onScrollInteractionEnd();
1360        mScrollInteractionBegan = false;
1361        if (mStartedSendingScrollEvents) {
1362            mStartedSendingScrollEvents = false;
1363            mLauncherOverlay.onScrollInteractionEnd();
1364        }
1365    }
1366
1367    public void setLauncherOverlay(LauncherOverlay overlay) {
1368        mLauncherOverlay = overlay;
1369        // A new overlay has been set. Reset event tracking
1370        mStartedSendingScrollEvents = false;
1371        onOverlayScrollChanged(0);
1372    }
1373
1374    @Override
1375    protected int getUnboundedScrollX() {
1376        if (isScrollingOverlay()) {
1377            return mUnboundedScrollX;
1378        }
1379
1380        return super.getUnboundedScrollX();
1381    }
1382
1383    private boolean isScrollingOverlay() {
1384        return mLauncherOverlay != null &&
1385                ((mIsRtl && mUnboundedScrollX > mMaxScrollX) || (!mIsRtl && mUnboundedScrollX < 0));
1386    }
1387
1388    @Override
1389    protected void snapToDestination() {
1390        // If we're overscrolling the overlay, we make sure to immediately reset the PagedView
1391        // to it's baseline position instead of letting the overscroll settle. The overlay handles
1392        // it's own settling, and every gesture to the overlay should be self-contained and start
1393        // from 0, so we zero it out here.
1394        if (isScrollingOverlay()) {
1395            // We reset mWasInOverscroll so that PagedView doesn't zero out the overscroll
1396            // interaction when we call snapToPageImmediately.
1397            mWasInOverscroll = false;
1398            snapToPageImmediately(0);
1399        } else {
1400            super.snapToDestination();
1401        }
1402    }
1403
1404    @Override
1405    public void scrollTo(int x, int y) {
1406        mUnboundedScrollX = x;
1407        super.scrollTo(x, y);
1408    }
1409
1410    private void onWorkspaceOverallScrollChanged() {
1411        if (!mIgnoreQsbScroll) {
1412            mLauncher.getQsbContainer().setTranslationX(
1413                    mOverlayTranslation + mFirstPageScrollX - getScrollX());
1414        }
1415    }
1416
1417    @Override
1418    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
1419        super.onScrollChanged(l, t, oldl, oldt);
1420        onWorkspaceOverallScrollChanged();
1421
1422        // Update the page indicator progress.
1423        boolean isTransitioning = mIsSwitchingState
1424                || (getLayoutTransition() != null && getLayoutTransition().isRunning());
1425        if (!isTransitioning) {
1426            showPageIndicatorAtCurrentScroll();
1427        }
1428
1429        updatePageAlphaValues();
1430        updateStateForCustomContent();
1431        enableHwLayersOnVisiblePages();
1432    }
1433
1434    private void showPageIndicatorAtCurrentScroll() {
1435        if (mPageIndicator != null) {
1436            mPageIndicator.setScroll(getScrollX(), computeMaxScrollX());
1437        }
1438    }
1439
1440    @Override
1441    protected void overScroll(float amount) {
1442        boolean shouldOverScroll = (amount <= 0 && (!hasCustomContent() || mIsRtl)) ||
1443                (amount >= 0 && (!hasCustomContent() || !mIsRtl));
1444
1445        boolean shouldScrollOverlay = mLauncherOverlay != null &&
1446                ((amount <= 0 && !mIsRtl) || (amount >= 0 && mIsRtl));
1447
1448        boolean shouldZeroOverlay = mLauncherOverlay != null && mLastOverlayScroll != 0 &&
1449                ((amount >= 0 && !mIsRtl) || (amount <= 0 && mIsRtl));
1450
1451        if (shouldScrollOverlay) {
1452            if (!mStartedSendingScrollEvents && mScrollInteractionBegan) {
1453                mStartedSendingScrollEvents = true;
1454                mLauncherOverlay.onScrollInteractionBegin();
1455            }
1456
1457            mLastOverlayScroll = Math.abs(amount / getViewportWidth());
1458            mLauncherOverlay.onScrollChange(mLastOverlayScroll, mIsRtl);
1459        } else if (shouldOverScroll) {
1460            dampedOverScroll(amount);
1461        }
1462
1463        if (shouldZeroOverlay) {
1464            mLauncherOverlay.onScrollChange(0, mIsRtl);
1465        }
1466    }
1467
1468    private final Interpolator mAlphaInterpolator = new DecelerateInterpolator(3f);
1469
1470    /**
1471     * The overlay scroll is being controlled locally, just update our overlay effect
1472     */
1473    public void onOverlayScrollChanged(float scroll) {
1474        float offset = 0f;
1475        float slip = 0f;
1476
1477        scroll = Math.max(scroll - offset, 0);
1478        scroll = Math.min(1, scroll / (1 - offset));
1479
1480        float alpha = 1 - mAlphaInterpolator.getInterpolation(scroll);
1481        float transX = mLauncher.getDragLayer().getMeasuredWidth() * scroll;
1482        transX *= 1 - slip;
1483
1484        if (mIsRtl) {
1485            transX = -transX;
1486        }
1487        mOverlayTranslation = transX;
1488
1489        // TODO(adamcohen): figure out a final effect here. We may need to recommend
1490        // different effects based on device performance. On at least one relatively high-end
1491        // device I've tried, translating the launcher causes things to get quite laggy.
1492        setWorkspaceTranslationAndAlpha(Direction.X, transX, alpha);
1493        setHotseatTranslationAndAlpha(Direction.X, transX, alpha);
1494        onWorkspaceOverallScrollChanged();
1495
1496        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_OVERLAY_SCROLL);
1497    }
1498
1499    /**
1500     * Moves the workspace UI in the Y direction.
1501     * @param translation the amount of shift.
1502     * @param alpha the alpha for the workspace page
1503     */
1504    public void setWorkspaceYTranslationAndAlpha(float translation, float alpha) {
1505        setWorkspaceTranslationAndAlpha(Direction.Y, translation, alpha);
1506
1507        mLauncher.getQsbContainer().setTranslationY(translation);
1508        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_Y_TRANSLATION);
1509    }
1510
1511    /**
1512     * Moves the workspace UI in the provided direction.
1513     * @param direction the direction to move the workspace
1514     * @param translation the amount of shift.
1515     * @param alpha the alpha for the workspace page
1516     */
1517    private void setWorkspaceTranslationAndAlpha(Direction direction, float translation, float alpha) {
1518        Property<View, Float> property = direction.viewProperty;
1519        mPageAlpha[direction.ordinal()] = alpha;
1520        float finalAlpha = mPageAlpha[0] * mPageAlpha[1];
1521
1522        View currentChild = getChildAt(getCurrentPage());
1523        if (currentChild != null) {
1524            property.set(currentChild, translation);
1525            currentChild.setAlpha(finalAlpha);
1526        }
1527
1528        // When the animation finishes, reset all pages, just in case we missed a page.
1529        if (Float.compare(translation, 0) == 0) {
1530            for (int i = getChildCount() - 1; i >= 0; i--) {
1531                View child = getChildAt(i);
1532                property.set(child, translation);
1533                child.setAlpha(finalAlpha);
1534            }
1535        }
1536    }
1537
1538    /**
1539     * Moves the Hotseat UI in the provided direction.
1540     * @param direction the direction to move the workspace
1541     * @param translation the amount of shift.
1542     * @param alpha the alpha for the hotseat page
1543     */
1544    public void setHotseatTranslationAndAlpha(Direction direction, float translation, float alpha) {
1545        Property<View, Float> property = direction.viewProperty;
1546        // Skip the page indicator movement in the vertical bar layout
1547        if (direction != Direction.Y || !mLauncher.getDeviceProfile().isVerticalBarLayout()) {
1548            property.set(mPageIndicator, translation);
1549        }
1550        property.set(mLauncher.getHotseat(), translation);
1551        setHotseatAlphaAtIndex(alpha, direction.ordinal());
1552    }
1553
1554    private void setHotseatAlphaAtIndex(float alpha, int index) {
1555        mHotseatAlpha[index] = alpha;
1556        final float hotseatAlpha = mHotseatAlpha[0] * mHotseatAlpha[1] * mHotseatAlpha[2];
1557        final float pageIndicatorAlpha = mHotseatAlpha[0] * mHotseatAlpha[2];
1558
1559        mLauncher.getHotseat().setAlpha(hotseatAlpha);
1560        mPageIndicator.setAlpha(pageIndicatorAlpha);
1561    }
1562
1563    public ValueAnimator createHotseatAlphaAnimator(float finalValue) {
1564        if (Float.compare(finalValue, mHotseatAlpha[HOTSEAT_STATE_ALPHA_INDEX]) == 0) {
1565            // Return a dummy animator to avoid null checks.
1566            return ValueAnimator.ofFloat(0, 0);
1567        } else {
1568            ValueAnimator animator = ValueAnimator
1569                    .ofFloat(mHotseatAlpha[HOTSEAT_STATE_ALPHA_INDEX], finalValue);
1570            animator.addUpdateListener(new AnimatorUpdateListener() {
1571                @Override
1572                public void onAnimationUpdate(ValueAnimator valueAnimator) {
1573                    float value = (Float) valueAnimator.getAnimatedValue();
1574                    setHotseatAlphaAtIndex(value, HOTSEAT_STATE_ALPHA_INDEX);
1575                }
1576            });
1577
1578            AccessibilityManager am = (AccessibilityManager)
1579                    mLauncher.getSystemService(Context.ACCESSIBILITY_SERVICE);
1580            final boolean accessibilityEnabled = am.isEnabled();
1581            animator.addUpdateListener(
1582                    new AlphaUpdateListener(mLauncher.getHotseat(), accessibilityEnabled));
1583            animator.addUpdateListener(
1584                    new AlphaUpdateListener(mPageIndicator, accessibilityEnabled));
1585            return animator;
1586        }
1587    }
1588
1589    @Override
1590    protected void getEdgeVerticalPosition(int[] pos) {
1591        View child = getChildAt(getPageCount() - 1);
1592        pos[0] = child.getTop();
1593        pos[1] = child.getBottom();
1594    }
1595
1596    @Override
1597    protected void notifyPageSwitchListener() {
1598        super.notifyPageSwitchListener();
1599
1600        if (hasCustomContent() && getNextPage() == 0 && !mCustomContentShowing) {
1601            mCustomContentShowing = true;
1602            if (mCustomContentCallbacks != null) {
1603                mCustomContentCallbacks.onShow(false);
1604                mCustomContentShowTime = System.currentTimeMillis();
1605            }
1606        } else if (hasCustomContent() && getNextPage() != 0 && mCustomContentShowing) {
1607            mCustomContentShowing = false;
1608            if (mCustomContentCallbacks != null) {
1609                mCustomContentCallbacks.onHide();
1610            }
1611        }
1612    }
1613
1614    protected CustomContentCallbacks getCustomContentCallbacks() {
1615        return mCustomContentCallbacks;
1616    }
1617
1618    protected void setWallpaperDimension() {
1619        Utilities.THREAD_POOL_EXECUTOR.execute(new Runnable() {
1620            @Override
1621            public void run() {
1622                final Point size = LauncherAppState.getIDP(getContext()).defaultWallpaperSize;
1623                if (size.x != mWallpaperManager.getDesiredMinimumWidth()
1624                        || size.y != mWallpaperManager.getDesiredMinimumHeight()) {
1625                    mWallpaperManager.suggestDesiredDimensions(size.x, size.y);
1626                }
1627            }
1628        });
1629    }
1630
1631    public void lockWallpaperToDefaultPage() {
1632        mWallpaperOffset.setLockToDefaultPage(true);
1633    }
1634
1635    public void unlockWallpaperFromDefaultPageOnNextLayout() {
1636        if (mWallpaperOffset.isLockedToDefaultPage()) {
1637            mUnlockWallpaperFromDefaultPageOnLayout = true;
1638            requestLayout();
1639        }
1640    }
1641
1642    protected void snapToPage(int whichPage, Runnable r) {
1643        snapToPage(whichPage, SLOW_PAGE_SNAP_ANIMATION_DURATION, r);
1644    }
1645
1646    protected void snapToPage(int whichPage, int duration, Runnable r) {
1647        if (mDelayedSnapToPageRunnable != null) {
1648            mDelayedSnapToPageRunnable.run();
1649        }
1650        mDelayedSnapToPageRunnable = r;
1651        snapToPage(whichPage, duration);
1652    }
1653
1654    public void snapToScreenId(long screenId) {
1655        snapToScreenId(screenId, null);
1656    }
1657
1658    protected void snapToScreenId(long screenId, Runnable r) {
1659        snapToPage(getPageIndexForScreenId(screenId), r);
1660    }
1661
1662    @Override
1663    public void computeScroll() {
1664        super.computeScroll();
1665        mWallpaperOffset.syncWithScroll();
1666    }
1667
1668    public void computeScrollWithoutInvalidation() {
1669        computeScrollHelper(false);
1670    }
1671
1672    @Override
1673    protected void determineScrollingStart(MotionEvent ev, float touchSlopScale) {
1674        if (!isSwitchingState()) {
1675            super.determineScrollingStart(ev, touchSlopScale);
1676        }
1677    }
1678
1679    @Override
1680    public void announceForAccessibility(CharSequence text) {
1681        // Don't announce if apps is on top of us.
1682        if (!mLauncher.isAppsViewVisible()) {
1683            super.announceForAccessibility(text);
1684        }
1685    }
1686
1687    public void showOutlinesTemporarily() {
1688        if (!mIsPageInTransition && !isTouchActive()) {
1689            snapToPage(mCurrentPage);
1690        }
1691    }
1692
1693    private void updatePageAlphaValues() {
1694        if (mWorkspaceFadeInAdjacentScreens &&
1695                !workspaceInModalState() &&
1696                !mIsSwitchingState) {
1697            int screenCenter = getScrollX() + getViewportWidth() / 2;
1698            for (int i = numCustomPages(); i < getChildCount(); i++) {
1699                CellLayout child = (CellLayout) getChildAt(i);
1700                if (child != null) {
1701                    float scrollProgress = getScrollProgress(screenCenter, child, i);
1702                    float alpha = 1 - Math.abs(scrollProgress);
1703                    child.getShortcutsAndWidgets().setAlpha(alpha);
1704
1705                    if (isQsbContainerPage(i)) {
1706                        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_PAGE_SCROLL);
1707                    }
1708                }
1709            }
1710        }
1711    }
1712
1713    public boolean hasCustomContent() {
1714        return (mScreenOrder.size() > 0 && mScreenOrder.get(0) == CUSTOM_CONTENT_SCREEN_ID);
1715    }
1716
1717    public int numCustomPages() {
1718        return hasCustomContent() ? 1 : 0;
1719    }
1720
1721    public boolean isOnOrMovingToCustomContent() {
1722        return hasCustomContent() && getNextPage() == 0;
1723    }
1724
1725    private void updateStateForCustomContent() {
1726        float translationX = 0;
1727        float progress = 0;
1728        if (hasCustomContent()) {
1729            int index = mScreenOrder.indexOf(CUSTOM_CONTENT_SCREEN_ID);
1730
1731            int scrollDelta = getScrollX() - getScrollForPage(index) -
1732                    getLayoutTransitionOffsetForPage(index);
1733            float scrollRange = getScrollForPage(index + 1) - getScrollForPage(index);
1734            translationX = scrollRange - scrollDelta;
1735            progress = (scrollRange - scrollDelta) / scrollRange;
1736
1737            if (mIsRtl) {
1738                translationX = Math.min(0, translationX);
1739            } else {
1740                translationX = Math.max(0, translationX);
1741            }
1742            progress = Math.max(0, progress);
1743        }
1744
1745        if (Float.compare(progress, mLastCustomContentScrollProgress) == 0) return;
1746
1747        CellLayout cc = mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID);
1748        if (progress > 0 && cc.getVisibility() != VISIBLE && !workspaceInModalState()) {
1749            cc.setVisibility(VISIBLE);
1750        }
1751
1752        mLastCustomContentScrollProgress = progress;
1753
1754        // We should only update the drag layer background alpha if we are not in all apps or the
1755        // widgets tray
1756        if (mState == State.NORMAL) {
1757            mLauncher.getDragLayer().setBackgroundAlpha(progress == 1 ? 0 : progress * 0.8f);
1758        }
1759
1760        if (mLauncher.getHotseat() != null) {
1761            mLauncher.getHotseat().setTranslationX(translationX);
1762        }
1763
1764        if (mPageIndicator != null) {
1765            mPageIndicator.setTranslationX(translationX);
1766        }
1767
1768        if (mCustomContentCallbacks != null) {
1769            mCustomContentCallbacks.onScrollProgressChanged(progress);
1770        }
1771    }
1772
1773    protected void onAttachedToWindow() {
1774        super.onAttachedToWindow();
1775        IBinder windowToken = getWindowToken();
1776        mWallpaperOffset.setWindowToken(windowToken);
1777        computeScroll();
1778        mDragController.setWindowToken(windowToken);
1779    }
1780
1781    protected void onDetachedFromWindow() {
1782        super.onDetachedFromWindow();
1783        mWallpaperOffset.setWindowToken(null);
1784    }
1785
1786    protected void onResume() {
1787        mWallpaperOffset.onResume();
1788    }
1789
1790    @Override
1791    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
1792        if (mUnlockWallpaperFromDefaultPageOnLayout) {
1793            mWallpaperOffset.setLockToDefaultPage(false);
1794            mUnlockWallpaperFromDefaultPageOnLayout = false;
1795        }
1796        if (mFirstLayout && mCurrentPage >= 0 && mCurrentPage < getChildCount()) {
1797            mWallpaperOffset.syncWithScroll();
1798            mWallpaperOffset.jumpToFinal();
1799        }
1800        super.onLayout(changed, left, top, right, bottom);
1801        mFirstPageScrollX = getScrollForPage(0);
1802        onWorkspaceOverallScrollChanged();
1803
1804        final LayoutTransition transition = getLayoutTransition();
1805        // If the transition is running defer updating max scroll, as some empty pages could
1806        // still be present, and a max scroll change could cause sudden jumps in scroll.
1807        if (transition != null && transition.isRunning()) {
1808            transition.addTransitionListener(new LayoutTransition.TransitionListener() {
1809
1810                @Override
1811                public void startTransition(LayoutTransition transition, ViewGroup container,
1812                                            View view, int transitionType) {
1813                    mIgnoreQsbScroll = true;
1814                }
1815
1816                @Override
1817                public void endTransition(LayoutTransition transition, ViewGroup container,
1818                                          View view, int transitionType) {
1819                    // Wait until all transitions are complete.
1820                    if (!transition.isRunning()) {
1821                        mIgnoreQsbScroll = false;
1822                        transition.removeTransitionListener(this);
1823                        mFirstPageScrollX = getScrollForPage(0);
1824                        onWorkspaceOverallScrollChanged();
1825                    }
1826                }
1827            });
1828        }
1829        updatePageAlphaValues();
1830    }
1831
1832    @Override
1833    public int getDescendantFocusability() {
1834        if (workspaceInModalState()) {
1835            return ViewGroup.FOCUS_BLOCK_DESCENDANTS;
1836        }
1837        return super.getDescendantFocusability();
1838    }
1839
1840    public boolean workspaceInModalState() {
1841        return mState != State.NORMAL;
1842    }
1843
1844    /** Returns whether a drag should be allowed to be started from the current workspace state. */
1845    public boolean workspaceIconsCanBeDragged() {
1846        return mState == State.NORMAL || mState == State.SPRING_LOADED;
1847    }
1848
1849    @Thunk void updateChildrenLayersEnabled(boolean force) {
1850        boolean small = mState == State.OVERVIEW || mIsSwitchingState;
1851        boolean enableChildrenLayers = force || small || mAnimatingViewIntoPlace || isPageInTransition();
1852
1853        if (enableChildrenLayers != mChildrenLayersEnabled) {
1854            mChildrenLayersEnabled = enableChildrenLayers;
1855            if (mChildrenLayersEnabled) {
1856                enableHwLayersOnVisiblePages();
1857            } else {
1858                for (int i = 0; i < getPageCount(); i++) {
1859                    final CellLayout cl = (CellLayout) getChildAt(i);
1860                    cl.enableHardwareLayer(false);
1861                }
1862            }
1863        }
1864    }
1865
1866    private void enableHwLayersOnVisiblePages() {
1867        if (mChildrenLayersEnabled) {
1868            final int screenCount = getChildCount();
1869
1870            float visibleLeft = getViewportOffsetX();
1871            float visibleRight = visibleLeft + getViewportWidth();
1872            float scaleX = getScaleX();
1873            if (scaleX < 1 && scaleX > 0) {
1874                float mid = getMeasuredWidth() / 2;
1875                visibleLeft = mid - ((mid - visibleLeft) / scaleX);
1876                visibleRight = mid + ((visibleRight - mid) / scaleX);
1877            }
1878
1879            int leftScreen = -1;
1880            int rightScreen = -1;
1881            for (int i = numCustomPages(); i < screenCount; i++) {
1882                final View child = getPageAt(i);
1883
1884                float left = child.getLeft() + child.getTranslationX() - getScrollX();
1885                if (left <= visibleRight && (left + child.getMeasuredWidth()) >= visibleLeft) {
1886                    if (leftScreen == -1) {
1887                        leftScreen = i;
1888                    }
1889                    rightScreen = i;
1890                }
1891            }
1892            if (mForceDrawAdjacentPages) {
1893                // In overview mode, make sure that the two side pages are visible.
1894                leftScreen = Utilities.boundToRange(getCurrentPage() - 1,
1895                    numCustomPages(), rightScreen);
1896                rightScreen = Utilities.boundToRange(getCurrentPage() + 1,
1897                    leftScreen, getPageCount() - 1);
1898            }
1899
1900            if (leftScreen == rightScreen) {
1901                // make sure we're caching at least two pages always
1902                if (rightScreen < screenCount - 1) {
1903                    rightScreen++;
1904                } else if (leftScreen > 0) {
1905                    leftScreen--;
1906                }
1907            }
1908
1909            for (int i = numCustomPages(); i < screenCount; i++) {
1910                final CellLayout layout = (CellLayout) getPageAt(i);
1911                // enable layers between left and right screen inclusive.
1912                boolean enableLayer = leftScreen <= i && i <= rightScreen;
1913                layout.enableHardwareLayer(enableLayer);
1914            }
1915        }
1916    }
1917
1918    public void buildPageHardwareLayers() {
1919        // force layers to be enabled just for the call to buildLayer
1920        updateChildrenLayersEnabled(true);
1921        if (getWindowToken() != null) {
1922            final int childCount = getChildCount();
1923            for (int i = 0; i < childCount; i++) {
1924                CellLayout cl = (CellLayout) getChildAt(i);
1925                cl.buildHardwareLayer();
1926            }
1927        }
1928        updateChildrenLayersEnabled(false);
1929    }
1930
1931    protected void onWallpaperTap(MotionEvent ev) {
1932        final int[] position = mTempXY;
1933        getLocationOnScreen(position);
1934
1935        int pointerIndex = ev.getActionIndex();
1936        position[0] += (int) ev.getX(pointerIndex);
1937        position[1] += (int) ev.getY(pointerIndex);
1938
1939        mWallpaperManager.sendWallpaperCommand(getWindowToken(),
1940                ev.getAction() == MotionEvent.ACTION_UP
1941                        ? WallpaperManager.COMMAND_TAP : WallpaperManager.COMMAND_SECONDARY_TAP,
1942                position[0], position[1], 0, null);
1943    }
1944
1945    public void prepareDragWithProvider(DragPreviewProvider outlineProvider) {
1946        mOutlineProvider = outlineProvider;
1947    }
1948
1949    public void exitWidgetResizeMode() {
1950        DragLayer dragLayer = mLauncher.getDragLayer();
1951        dragLayer.clearResizeFrame();
1952    }
1953
1954    @Override
1955    protected void getFreeScrollPageRange(int[] range) {
1956        getOverviewModePages(range);
1957    }
1958
1959    private void getOverviewModePages(int[] range) {
1960        int start = numCustomPages();
1961        int end = getChildCount() - 1;
1962
1963        range[0] = Math.max(0, Math.min(start, getChildCount() - 1));
1964        range[1] = Math.max(0, end);
1965    }
1966
1967    public void onStartReordering() {
1968        super.onStartReordering();
1969        // Reordering handles its own animations, disable the automatic ones.
1970        disableLayoutTransitions();
1971    }
1972
1973    public void onEndReordering() {
1974        super.onEndReordering();
1975
1976        if (mLauncher.isWorkspaceLoading()) {
1977            // Invalid and dangerous operation if workspace is loading
1978            return;
1979        }
1980
1981        mScreenOrder.clear();
1982        int count = getChildCount();
1983        for (int i = 0; i < count; i++) {
1984            CellLayout cl = ((CellLayout) getChildAt(i));
1985            mScreenOrder.add(getIdForScreen(cl));
1986        }
1987        mLauncher.getUserEventDispatcher().logOverviewReorder();
1988        mLauncher.getModel().updateWorkspaceScreenOrder(mLauncher, mScreenOrder);
1989
1990        // Re-enable auto layout transitions for page deletion.
1991        enableLayoutTransitions();
1992    }
1993
1994    public boolean isInOverviewMode() {
1995        return mState == State.OVERVIEW;
1996    }
1997
1998    public void snapToPageFromOverView(int whichPage) {
1999        mStateTransitionAnimation.snapToPageFromOverView(whichPage);
2000    }
2001
2002    int getOverviewModeTranslationY() {
2003        DeviceProfile grid = mLauncher.getDeviceProfile();
2004        int overviewButtonBarHeight = grid.getOverviewModeButtonBarHeight();
2005
2006        int scaledHeight = (int) (mOverviewModeShrinkFactor * getNormalChildHeight());
2007        Rect workspacePadding = grid.getWorkspacePadding(sTempRect);
2008        int workspaceTop = mInsets.top + workspacePadding.top;
2009        int workspaceBottom = getViewportHeight() - mInsets.bottom - workspacePadding.bottom;
2010        int overviewTop = mInsets.top;
2011        int overviewBottom = getViewportHeight() - mInsets.bottom - overviewButtonBarHeight;
2012        int workspaceOffsetTopEdge = workspaceTop + ((workspaceBottom - workspaceTop) - scaledHeight) / 2;
2013        int overviewOffsetTopEdge = overviewTop + (overviewBottom - overviewTop - scaledHeight) / 2;
2014        return -workspaceOffsetTopEdge + overviewOffsetTopEdge;
2015    }
2016
2017    float getSpringLoadedTranslationY() {
2018        DeviceProfile grid = mLauncher.getDeviceProfile();
2019        if (grid.isVerticalBarLayout() || getChildCount() == 0) {
2020            return 0;
2021        }
2022
2023        float scaledHeight = grid.workspaceSpringLoadShrinkFactor * getNormalChildHeight();
2024        float shrunkTop = mInsets.top + grid.dropTargetBarSizePx;
2025        float shrunkBottom = getViewportHeight() - mInsets.bottom
2026                - grid.getWorkspacePadding(sTempRect).bottom
2027                - grid.workspaceSpringLoadedBottomSpace;
2028        float totalShrunkSpace = shrunkBottom - shrunkTop;
2029
2030        float desiredCellTop = shrunkTop + (totalShrunkSpace - scaledHeight) / 2;
2031
2032        float halfHeight = getHeight() / 2;
2033        float myCenter = getTop() + halfHeight;
2034        float cellTopFromCenter = halfHeight - getChildAt(0).getTop();
2035        float actualCellTop = myCenter - cellTopFromCenter * grid.workspaceSpringLoadShrinkFactor;
2036        return (desiredCellTop - actualCellTop) / grid.workspaceSpringLoadShrinkFactor;
2037    }
2038
2039    float getOverviewModeShrinkFactor() {
2040        return mOverviewModeShrinkFactor;
2041    }
2042
2043    /**
2044     * Sets the current workspace {@link State}, returning an animation transitioning the workspace
2045     * to that new state.
2046     */
2047    public Animator setStateWithAnimation(State toState, boolean animated,
2048            AnimationLayerSet layerViews) {
2049        final State fromState = mState;
2050
2051        // Update the current state
2052        mState = toState;
2053
2054        // Create the animation to the new state
2055        AnimatorSet workspaceAnim =  mStateTransitionAnimation.getAnimationToState(fromState,
2056                toState, animated, layerViews);
2057
2058        boolean shouldNotifyWidgetChange = !fromState.shouldUpdateWidget
2059                && toState.shouldUpdateWidget;
2060
2061        updateAccessibilityFlags();
2062
2063        if (shouldNotifyWidgetChange) {
2064            mLauncher.notifyWidgetProvidersChanged();
2065        }
2066
2067        if (mOnStateChangeListener != null) {
2068            mOnStateChangeListener.prepareStateChange(toState, animated ? workspaceAnim : null);
2069        }
2070
2071        onPrepareStateTransition(mState.hasMultipleVisiblePages);
2072
2073        StateTransitionListener listener = new StateTransitionListener();
2074        if (animated) {
2075            ValueAnimator stepAnimator = ValueAnimator.ofFloat(0, 1);
2076            stepAnimator.addUpdateListener(listener);
2077
2078            workspaceAnim.play(stepAnimator);
2079            workspaceAnim.addListener(listener);
2080        } else {
2081            listener.onAnimationStart(null);
2082            listener.onAnimationEnd(null);
2083        }
2084
2085        return workspaceAnim;
2086    }
2087
2088    public State getState() {
2089        return mState;
2090    }
2091
2092    public void updateAccessibilityFlags() {
2093        // TODO: Update the accessibility flags appropriately when dragging.
2094        if (!mLauncher.getAccessibilityDelegate().isInAccessibleDrag()) {
2095            int total = getPageCount();
2096            for (int i = numCustomPages(); i < total; i++) {
2097                updateAccessibilityFlags((CellLayout) getPageAt(i), i);
2098            }
2099            setImportantForAccessibility((mState == State.NORMAL || mState == State.OVERVIEW)
2100                    ? IMPORTANT_FOR_ACCESSIBILITY_AUTO
2101                    : IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
2102        }
2103    }
2104
2105    private void updateAccessibilityFlags(CellLayout page, int pageNo) {
2106        if (mState == State.OVERVIEW) {
2107            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_YES);
2108            page.getShortcutsAndWidgets().setImportantForAccessibility(
2109                    IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS);
2110            page.setContentDescription(getPageDescription(pageNo));
2111
2112            // No custom action for the first page.
2113            if (!FeatureFlags.QSB_ON_FIRST_SCREEN || pageNo > 0) {
2114                if (mPagesAccessibilityDelegate == null) {
2115                    mPagesAccessibilityDelegate = new OverviewScreenAccessibilityDelegate(this);
2116                }
2117                page.setAccessibilityDelegate(mPagesAccessibilityDelegate);
2118            }
2119        } else {
2120            int accessible = mState == State.NORMAL ?
2121                    IMPORTANT_FOR_ACCESSIBILITY_AUTO :
2122                        IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS;
2123            page.setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
2124            page.getShortcutsAndWidgets().setImportantForAccessibility(accessible);
2125            page.setContentDescription(null);
2126            page.setAccessibilityDelegate(null);
2127        }
2128    }
2129
2130    public void onPrepareStateTransition(boolean multiplePagesVisible) {
2131        mIsSwitchingState = true;
2132        mTransitionProgress = 0;
2133
2134        if (multiplePagesVisible) {
2135            mForceDrawAdjacentPages = true;
2136        }
2137        invalidate(); // This will call dispatchDraw(), which calls getVisiblePages().
2138
2139        updateChildrenLayersEnabled(false);
2140        hideCustomContentIfNecessary();
2141    }
2142
2143    public void onEndStateTransition() {
2144        mIsSwitchingState = false;
2145        updateChildrenLayersEnabled(false);
2146        showCustomContentIfNecessary();
2147        mForceDrawAdjacentPages = false;
2148        mTransitionProgress = 1;
2149    }
2150
2151    void updateCustomContentVisibility() {
2152        int visibility = mState == Workspace.State.NORMAL ? VISIBLE : INVISIBLE;
2153        setCustomContentVisibility(visibility);
2154    }
2155
2156    void setCustomContentVisibility(int visibility) {
2157        if (hasCustomContent()) {
2158            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(visibility);
2159        }
2160    }
2161
2162    void showCustomContentIfNecessary() {
2163        boolean show  = mState == Workspace.State.NORMAL;
2164        if (show && hasCustomContent()) {
2165            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(VISIBLE);
2166        }
2167    }
2168
2169    void hideCustomContentIfNecessary() {
2170        boolean hide  = mState != Workspace.State.NORMAL;
2171        if (hide && hasCustomContent()) {
2172            disableLayoutTransitions();
2173            mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
2174            enableLayoutTransitions();
2175        }
2176    }
2177
2178    /**
2179     * Returns the drawable for the given text view.
2180     */
2181    public static Drawable getTextViewIcon(TextView tv) {
2182        final Drawable[] drawables = tv.getCompoundDrawables();
2183        for (int i = 0; i < drawables.length; i++) {
2184            if (drawables[i] != null) {
2185                return drawables[i];
2186            }
2187        }
2188        return null;
2189    }
2190
2191    public void startDrag(CellLayout.CellInfo cellInfo, DragOptions options) {
2192        View child = cellInfo.cell;
2193
2194        // Make sure the drag was started by a long press as opposed to a long click.
2195        if (!child.isInTouchMode()) {
2196            return;
2197        }
2198
2199        mDragInfo = cellInfo;
2200        child.setVisibility(INVISIBLE);
2201
2202        if (options.isAccessibleDrag) {
2203            mDragController.addDragListener(new AccessibleDragListenerAdapter(
2204                    this, CellLayout.WORKSPACE_ACCESSIBILITY_DRAG) {
2205                @Override
2206                protected void enableAccessibleDrag(boolean enable) {
2207                    super.enableAccessibleDrag(enable);
2208                    setEnableForLayout(mLauncher.getHotseat().getLayout(),enable);
2209
2210                    // We need to allow our individual children to become click handlers in this
2211                    // case, so temporarily unset the click handlers.
2212                    setOnClickListener(enable ? null : mLauncher);
2213                }
2214            });
2215        }
2216
2217        beginDragShared(child, this, options);
2218    }
2219
2220    public void beginDragShared(View child, DragSource source, DragOptions options) {
2221        Object dragObject = child.getTag();
2222        if (!(dragObject instanceof ItemInfo)) {
2223            String msg = "Drag started with a view that has no tag set. This "
2224                    + "will cause a crash (issue 11627249) down the line. "
2225                    + "View: " + child + "  tag: " + child.getTag();
2226            throw new IllegalStateException(msg);
2227        }
2228        beginDragShared(child, source, (ItemInfo) dragObject,
2229                new DragPreviewProvider(child), options);
2230    }
2231
2232
2233    public DragView beginDragShared(View child, DragSource source, ItemInfo dragObject,
2234            DragPreviewProvider previewProvider, DragOptions dragOptions) {
2235        child.clearFocus();
2236        child.setPressed(false);
2237        mOutlineProvider = previewProvider;
2238
2239        // The drag bitmap follows the touch point around on the screen
2240        final Bitmap b = previewProvider.createDragBitmap(mCanvas);
2241        int halfPadding = previewProvider.previewPadding / 2;
2242
2243        float scale = previewProvider.getScaleAndPosition(b, mTempXY);
2244        int dragLayerX = mTempXY[0];
2245        int dragLayerY = mTempXY[1];
2246
2247        DeviceProfile grid = mLauncher.getDeviceProfile();
2248        Point dragVisualizeOffset = null;
2249        Rect dragRect = null;
2250        if (child instanceof BubbleTextView) {
2251            dragRect = new Rect();
2252            ((BubbleTextView) child).getIconBounds(dragRect);
2253            dragLayerY += dragRect.top;
2254            // Note: The dragRect is used to calculate drag layer offsets, but the
2255            // dragVisualizeOffset in addition to the dragRect (the size) to position the outline.
2256            dragVisualizeOffset = new Point(- halfPadding, halfPadding);
2257        } else if (child instanceof FolderIcon) {
2258            int previewSize = grid.folderIconSizePx;
2259            dragVisualizeOffset = new Point(- halfPadding, halfPadding - child.getPaddingTop());
2260            dragRect = new Rect(0, child.getPaddingTop(), child.getWidth(), previewSize);
2261        } else if (previewProvider instanceof ShortcutDragPreviewProvider) {
2262            dragVisualizeOffset = new Point(- halfPadding, halfPadding);
2263        }
2264
2265        // Clear the pressed state if necessary
2266        if (child instanceof BubbleTextView) {
2267            BubbleTextView icon = (BubbleTextView) child;
2268            icon.clearPressedBackground();
2269        }
2270
2271        if (child.getParent() instanceof ShortcutAndWidgetContainer) {
2272            mDragSourceInternal = (ShortcutAndWidgetContainer) child.getParent();
2273        }
2274
2275        if (child instanceof BubbleTextView) {
2276            PopupContainerWithArrow popupContainer = PopupContainerWithArrow
2277                    .showForIcon((BubbleTextView) child);
2278            if (popupContainer != null) {
2279                dragOptions.preDragCondition = popupContainer.createPreDragCondition();
2280
2281                mLauncher.getUserEventDispatcher().resetElapsedContainerMillis();
2282            }
2283        }
2284
2285        DragView dv = mDragController.startDrag(b, dragLayerX, dragLayerY, source,
2286                dragObject, dragVisualizeOffset, dragRect, scale, dragOptions);
2287        dv.setIntrinsicIconScaleFactor(source.getIntrinsicIconScaleFactor());
2288        b.recycle();
2289        return dv;
2290    }
2291
2292    private boolean transitionStateShouldAllowDrop() {
2293        return ((!isSwitchingState() || mTransitionProgress > ALLOW_DROP_TRANSITION_PROGRESS) &&
2294                (mState == State.NORMAL || mState == State.SPRING_LOADED));
2295    }
2296
2297    /**
2298     * {@inheritDoc}
2299     */
2300    public boolean acceptDrop(DragObject d) {
2301        // If it's an external drop (e.g. from All Apps), check if it should be accepted
2302        CellLayout dropTargetLayout = mDropToLayout;
2303        if (d.dragSource != this) {
2304            // Don't accept the drop if we're not over a screen at time of drop
2305            if (dropTargetLayout == null) {
2306                return false;
2307            }
2308            if (!transitionStateShouldAllowDrop()) return false;
2309
2310            mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2311
2312            // We want the point to be mapped to the dragTarget.
2313            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2314                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2315            } else {
2316                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2317            }
2318
2319            int spanX = 1;
2320            int spanY = 1;
2321            if (mDragInfo != null) {
2322                final CellLayout.CellInfo dragCellInfo = mDragInfo;
2323                spanX = dragCellInfo.spanX;
2324                spanY = dragCellInfo.spanY;
2325            } else {
2326                spanX = d.dragInfo.spanX;
2327                spanY = d.dragInfo.spanY;
2328            }
2329
2330            int minSpanX = spanX;
2331            int minSpanY = spanY;
2332            if (d.dragInfo instanceof PendingAddWidgetInfo) {
2333                minSpanX = ((PendingAddWidgetInfo) d.dragInfo).minSpanX;
2334                minSpanY = ((PendingAddWidgetInfo) d.dragInfo).minSpanY;
2335            }
2336
2337            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2338                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, dropTargetLayout,
2339                    mTargetCell);
2340            float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2341                    mDragViewVisualCenter[1], mTargetCell);
2342            if (mCreateUserFolderOnDrop && willCreateUserFolder(d.dragInfo,
2343                    dropTargetLayout, mTargetCell, distance, true)) {
2344                return true;
2345            }
2346
2347            if (mAddToExistingFolderOnDrop && willAddToExistingUserFolder(d.dragInfo,
2348                    dropTargetLayout, mTargetCell, distance)) {
2349                return true;
2350            }
2351
2352            int[] resultSpan = new int[2];
2353            mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2354                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
2355                    null, mTargetCell, resultSpan, CellLayout.MODE_ACCEPT_DROP);
2356            boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2357
2358            // Don't accept the drop if there's no room for the item
2359            if (!foundCell) {
2360                onNoCellFound(dropTargetLayout);
2361                return false;
2362            }
2363        }
2364
2365        long screenId = getIdForScreen(dropTargetLayout);
2366        if (screenId == EXTRA_EMPTY_SCREEN_ID) {
2367            commitExtraEmptyScreen();
2368        }
2369
2370        return true;
2371    }
2372
2373    boolean willCreateUserFolder(ItemInfo info, CellLayout target, int[] targetCell,
2374            float distance, boolean considerTimeout) {
2375        if (distance > mMaxDistanceForFolderCreation) return false;
2376        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2377        return willCreateUserFolder(info, dropOverView, considerTimeout);
2378    }
2379
2380    boolean willCreateUserFolder(ItemInfo info, View dropOverView, boolean considerTimeout) {
2381        if (dropOverView != null) {
2382            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2383            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2384                return false;
2385            }
2386        }
2387
2388        boolean hasntMoved = false;
2389        if (mDragInfo != null) {
2390            hasntMoved = dropOverView == mDragInfo.cell;
2391        }
2392
2393        if (dropOverView == null || hasntMoved || (considerTimeout && !mCreateUserFolderOnDrop)) {
2394            return false;
2395        }
2396
2397        boolean aboveShortcut = (dropOverView.getTag() instanceof ShortcutInfo);
2398        boolean willBecomeShortcut =
2399                (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
2400                        info.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT ||
2401                        info.itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT);
2402
2403        return (aboveShortcut && willBecomeShortcut);
2404    }
2405
2406    boolean willAddToExistingUserFolder(ItemInfo dragInfo, CellLayout target, int[] targetCell,
2407            float distance) {
2408        if (distance > mMaxDistanceForFolderCreation) return false;
2409        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2410        return willAddToExistingUserFolder(dragInfo, dropOverView);
2411
2412    }
2413    boolean willAddToExistingUserFolder(ItemInfo dragInfo, View dropOverView) {
2414        if (dropOverView != null) {
2415            CellLayout.LayoutParams lp = (CellLayout.LayoutParams) dropOverView.getLayoutParams();
2416            if (lp.useTmpCoords && (lp.tmpCellX != lp.cellX || lp.tmpCellY != lp.cellY)) {
2417                return false;
2418            }
2419        }
2420
2421        if (dropOverView instanceof FolderIcon) {
2422            FolderIcon fi = (FolderIcon) dropOverView;
2423            if (fi.acceptDrop(dragInfo)) {
2424                return true;
2425            }
2426        }
2427        return false;
2428    }
2429
2430    boolean createUserFolderIfNecessary(View newView, long container, CellLayout target,
2431            int[] targetCell, float distance, boolean external, DragView dragView,
2432            Runnable postAnimationRunnable) {
2433        if (distance > mMaxDistanceForFolderCreation) return false;
2434        View v = target.getChildAt(targetCell[0], targetCell[1]);
2435
2436        boolean hasntMoved = false;
2437        if (mDragInfo != null) {
2438            CellLayout cellParent = getParentCellLayoutForView(mDragInfo.cell);
2439            hasntMoved = (mDragInfo.cellX == targetCell[0] &&
2440                    mDragInfo.cellY == targetCell[1]) && (cellParent == target);
2441        }
2442
2443        if (v == null || hasntMoved || !mCreateUserFolderOnDrop) return false;
2444        mCreateUserFolderOnDrop = false;
2445        final long screenId = getIdForScreen(target);
2446
2447        boolean aboveShortcut = (v.getTag() instanceof ShortcutInfo);
2448        boolean willBecomeShortcut = (newView.getTag() instanceof ShortcutInfo);
2449
2450        if (aboveShortcut && willBecomeShortcut) {
2451            ShortcutInfo sourceInfo = (ShortcutInfo) newView.getTag();
2452            ShortcutInfo destInfo = (ShortcutInfo) v.getTag();
2453            // if the drag started here, we need to remove it from the workspace
2454            if (!external) {
2455                getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2456            }
2457
2458            Rect folderLocation = new Rect();
2459            float scale = mLauncher.getDragLayer().getDescendantRectRelativeToSelf(v, folderLocation);
2460            target.removeView(v);
2461
2462            FolderIcon fi =
2463                mLauncher.addFolder(target, container, screenId, targetCell[0], targetCell[1]);
2464            destInfo.cellX = -1;
2465            destInfo.cellY = -1;
2466            sourceInfo.cellX = -1;
2467            sourceInfo.cellY = -1;
2468
2469            // If the dragView is null, we can't animate
2470            boolean animate = dragView != null;
2471            if (animate) {
2472                // In order to keep everything continuous, we hand off the currently rendered
2473                // folder background to the newly created icon. This preserves animation state.
2474                fi.setFolderBackground(mFolderCreateBg);
2475                mFolderCreateBg = new FolderIcon.PreviewBackground();
2476                fi.performCreateAnimation(destInfo, v, sourceInfo, dragView, folderLocation, scale,
2477                        postAnimationRunnable);
2478            } else {
2479                fi.prepareCreate(v);
2480                fi.addItem(destInfo);
2481                fi.addItem(sourceInfo);
2482            }
2483            return true;
2484        }
2485        return false;
2486    }
2487
2488    boolean addToExistingFolderIfNecessary(View newView, CellLayout target, int[] targetCell,
2489            float distance, DragObject d, boolean external) {
2490        if (distance > mMaxDistanceForFolderCreation) return false;
2491
2492        View dropOverView = target.getChildAt(targetCell[0], targetCell[1]);
2493        if (!mAddToExistingFolderOnDrop) return false;
2494        mAddToExistingFolderOnDrop = false;
2495
2496        if (dropOverView instanceof FolderIcon) {
2497            FolderIcon fi = (FolderIcon) dropOverView;
2498            if (fi.acceptDrop(d.dragInfo)) {
2499                fi.onDrop(d);
2500
2501                // if the drag started here, we need to remove it from the workspace
2502                if (!external) {
2503                    getParentCellLayoutForView(mDragInfo.cell).removeView(mDragInfo.cell);
2504                }
2505                return true;
2506            }
2507        }
2508        return false;
2509    }
2510
2511    @Override
2512    public void prepareAccessibilityDrop() { }
2513
2514    public void onDrop(final DragObject d) {
2515        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2516        CellLayout dropTargetLayout = mDropToLayout;
2517
2518        // We want the point to be mapped to the dragTarget.
2519        if (dropTargetLayout != null) {
2520            if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2521                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2522            } else {
2523                mapPointFromSelfToChild(dropTargetLayout, mDragViewVisualCenter);
2524            }
2525        }
2526
2527        int snapScreen = -1;
2528        boolean resizeOnDrop = false;
2529        if (d.dragSource != this) {
2530            final int[] touchXY = new int[] { (int) mDragViewVisualCenter[0],
2531                    (int) mDragViewVisualCenter[1] };
2532            onDropExternal(touchXY, dropTargetLayout, d);
2533        } else if (mDragInfo != null) {
2534            final View cell = mDragInfo.cell;
2535            boolean droppedOnOriginalCellDuringTransition = false;
2536
2537            if (dropTargetLayout != null && !d.cancelled) {
2538                // Move internally
2539                boolean hasMovedLayouts = (getParentCellLayoutForView(cell) != dropTargetLayout);
2540                boolean hasMovedIntoHotseat = mLauncher.isHotseatLayout(dropTargetLayout);
2541                long container = hasMovedIntoHotseat ?
2542                        LauncherSettings.Favorites.CONTAINER_HOTSEAT :
2543                        LauncherSettings.Favorites.CONTAINER_DESKTOP;
2544                long screenId = (mTargetCell[0] < 0) ?
2545                        mDragInfo.screenId : getIdForScreen(dropTargetLayout);
2546                int spanX = mDragInfo != null ? mDragInfo.spanX : 1;
2547                int spanY = mDragInfo != null ? mDragInfo.spanY : 1;
2548                // First we find the cell nearest to point at which the item is
2549                // dropped, without any consideration to whether there is an item there.
2550
2551                mTargetCell = findNearestArea((int) mDragViewVisualCenter[0], (int)
2552                        mDragViewVisualCenter[1], spanX, spanY, dropTargetLayout, mTargetCell);
2553                float distance = dropTargetLayout.getDistanceFromCell(mDragViewVisualCenter[0],
2554                        mDragViewVisualCenter[1], mTargetCell);
2555
2556                // If the item being dropped is a shortcut and the nearest drop
2557                // cell also contains a shortcut, then create a folder with the two shortcuts.
2558                if (createUserFolderIfNecessary(cell, container,
2559                        dropTargetLayout, mTargetCell, distance, false, d.dragView, null)) {
2560                    return;
2561                }
2562
2563                if (addToExistingFolderIfNecessary(cell, dropTargetLayout, mTargetCell,
2564                        distance, d, false)) {
2565                    return;
2566                }
2567
2568                // Aside from the special case where we're dropping a shortcut onto a shortcut,
2569                // we need to find the nearest cell location that is vacant
2570                ItemInfo item = d.dragInfo;
2571                int minSpanX = item.spanX;
2572                int minSpanY = item.spanY;
2573                if (item.minSpanX > 0 && item.minSpanY > 0) {
2574                    minSpanX = item.minSpanX;
2575                    minSpanY = item.minSpanY;
2576                }
2577
2578                droppedOnOriginalCellDuringTransition = mIsSwitchingState
2579                        && item.screenId == screenId && item.container == container
2580                        && item.cellX == mTargetCell[0] && item.cellY == mTargetCell[1];
2581
2582                // When quickly moving an item, a user may accidentally rearrange their
2583                // workspace. So instead we move the icon back safely to its original position.
2584                boolean returnToOriginalCellToPreventShuffling = !isFinishedSwitchingState()
2585                        && !droppedOnOriginalCellDuringTransition && !dropTargetLayout
2586                        .isRegionVacant(mTargetCell[0], mTargetCell[1], spanX, spanY);
2587                int[] resultSpan = new int[2];
2588                if (returnToOriginalCellToPreventShuffling) {
2589                    mTargetCell[0] = mTargetCell[1] = -1;
2590                } else {
2591                    mTargetCell = dropTargetLayout.performReorder((int) mDragViewVisualCenter[0],
2592                            (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY, cell,
2593                            mTargetCell, resultSpan, CellLayout.MODE_ON_DROP);
2594                }
2595
2596                boolean foundCell = mTargetCell[0] >= 0 && mTargetCell[1] >= 0;
2597
2598                // if the widget resizes on drop
2599                if (foundCell && (cell instanceof AppWidgetHostView) &&
2600                        (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY)) {
2601                    resizeOnDrop = true;
2602                    item.spanX = resultSpan[0];
2603                    item.spanY = resultSpan[1];
2604                    AppWidgetHostView awhv = (AppWidgetHostView) cell;
2605                    AppWidgetResizeFrame.updateWidgetSizeRanges(awhv, mLauncher, resultSpan[0],
2606                            resultSpan[1]);
2607                }
2608
2609                if (foundCell) {
2610                    if (getScreenIdForPageIndex(mCurrentPage) != screenId && !hasMovedIntoHotseat) {
2611                        snapScreen = getPageIndexForScreenId(screenId);
2612                        snapToPage(snapScreen);
2613                    }
2614
2615                    final ItemInfo info = (ItemInfo) cell.getTag();
2616                    if (hasMovedLayouts) {
2617                        // Reparent the view
2618                        CellLayout parentCell = getParentCellLayoutForView(cell);
2619                        if (parentCell != null) {
2620                            parentCell.removeView(cell);
2621                        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
2622                            throw new NullPointerException("mDragInfo.cell has null parent");
2623                        }
2624                        addInScreen(cell, container, screenId, mTargetCell[0], mTargetCell[1],
2625                                info.spanX, info.spanY);
2626                    }
2627
2628                    // update the item's position after drop
2629                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2630                    lp.cellX = lp.tmpCellX = mTargetCell[0];
2631                    lp.cellY = lp.tmpCellY = mTargetCell[1];
2632                    lp.cellHSpan = item.spanX;
2633                    lp.cellVSpan = item.spanY;
2634                    lp.isLockedToGrid = true;
2635
2636                    if (container != LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
2637                            cell instanceof LauncherAppWidgetHostView) {
2638                        final CellLayout cellLayout = dropTargetLayout;
2639                        // We post this call so that the widget has a chance to be placed
2640                        // in its final location
2641
2642                        final LauncherAppWidgetHostView hostView = (LauncherAppWidgetHostView) cell;
2643                        AppWidgetProviderInfo pInfo = hostView.getAppWidgetInfo();
2644                        if (pInfo != null && pInfo.resizeMode != AppWidgetProviderInfo.RESIZE_NONE
2645                                && !d.accessibleDrag) {
2646                            mDelayedResizeRunnable = new Runnable() {
2647                                public void run() {
2648                                    if (!isPageInTransition()) {
2649                                        DragLayer dragLayer = mLauncher.getDragLayer();
2650                                        dragLayer.addResizeFrame(hostView, cellLayout);
2651                                    }
2652                                }
2653                            };
2654                        }
2655                    }
2656
2657                    mLauncher.getModelWriter().modifyItemInDatabase(info, container, screenId,
2658                            lp.cellX, lp.cellY, item.spanX, item.spanY);
2659                } else {
2660                    if (!returnToOriginalCellToPreventShuffling) {
2661                        onNoCellFound(dropTargetLayout);
2662                    }
2663
2664                    // If we can't find a drop location, we return the item to its original position
2665                    CellLayout.LayoutParams lp = (CellLayout.LayoutParams) cell.getLayoutParams();
2666                    mTargetCell[0] = lp.cellX;
2667                    mTargetCell[1] = lp.cellY;
2668                    CellLayout layout = (CellLayout) cell.getParent().getParent();
2669                    layout.markCellsAsOccupiedForView(cell);
2670                }
2671            }
2672
2673            final CellLayout parent = (CellLayout) cell.getParent().getParent();
2674            // Prepare it to be animated into its new position
2675            // This must be called after the view has been re-parented
2676            final Runnable onCompleteRunnable = new Runnable() {
2677                @Override
2678                public void run() {
2679                    mAnimatingViewIntoPlace = false;
2680                    updateChildrenLayersEnabled(false);
2681                }
2682            };
2683            mAnimatingViewIntoPlace = true;
2684            if (d.dragView.hasDrawn()) {
2685                if (droppedOnOriginalCellDuringTransition) {
2686                    // Animate the item to its original position, while simultaneously exiting
2687                    // spring-loaded mode so the page meets the icon where it was picked up.
2688                    mLauncher.getDragController().animateDragViewToOriginalPosition(
2689                            mDelayedResizeRunnable, cell,
2690                            mStateTransitionAnimation.mSpringLoadedTransitionTime);
2691                    mLauncher.exitSpringLoadedDragMode();
2692                    mLauncher.getDropTargetBar().onDragEnd();
2693                    parent.onDropChild(cell);
2694                    return;
2695                }
2696                final ItemInfo info = (ItemInfo) cell.getTag();
2697                boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
2698                        || info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
2699                if (isWidget) {
2700                    int animationType = resizeOnDrop ? ANIMATE_INTO_POSITION_AND_RESIZE :
2701                            ANIMATE_INTO_POSITION_AND_DISAPPEAR;
2702                    animateWidgetDrop(info, parent, d.dragView,
2703                            onCompleteRunnable, animationType, cell, false);
2704                } else {
2705                    int duration = snapScreen < 0 ? -1 : ADJACENT_SCREEN_DROP_DURATION;
2706                    mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, cell, duration,
2707                            onCompleteRunnable, this);
2708                }
2709            } else {
2710                d.deferDragViewCleanupPostAnimation = false;
2711                cell.setVisibility(VISIBLE);
2712            }
2713            parent.onDropChild(cell);
2714        }
2715        if (d.stateAnnouncer != null) {
2716            d.stateAnnouncer.completeAction(R.string.item_moved);
2717        }
2718    }
2719
2720    public void onNoCellFound(View dropTargetLayout) {
2721        if (mLauncher.isHotseatLayout(dropTargetLayout)) {
2722            Hotseat hotseat = mLauncher.getHotseat();
2723            boolean droppedOnAllAppsIcon = !FeatureFlags.NO_ALL_APPS_ICON
2724                    && mTargetCell != null && !mLauncher.getDeviceProfile().inv.isAllAppsButtonRank(
2725                    hotseat.getOrderInHotseat(mTargetCell[0], mTargetCell[1]));
2726            if (!droppedOnAllAppsIcon) {
2727                // Only show message when hotseat is full and drop target was not AllApps button
2728                showOutOfSpaceMessage(true);
2729            }
2730        } else {
2731            showOutOfSpaceMessage(false);
2732        }
2733    }
2734
2735    private void showOutOfSpaceMessage(boolean isHotseatLayout) {
2736        int strId = (isHotseatLayout ? R.string.hotseat_out_of_space : R.string.out_of_space);
2737        Toast.makeText(mLauncher, mLauncher.getString(strId), Toast.LENGTH_SHORT).show();
2738    }
2739
2740    /**
2741     * Computes the area relative to dragLayer which is used to display a page.
2742     */
2743    public void getPageAreaRelativeToDragLayer(Rect outArea) {
2744        CellLayout child = (CellLayout) getChildAt(getNextPage());
2745        if (child == null) {
2746            return;
2747        }
2748        ShortcutAndWidgetContainer boundingLayout = child.getShortcutsAndWidgets();
2749
2750        // Use the absolute left instead of the child left, as we want the visible area
2751        // irrespective of the visible child. Since the view can only scroll horizontally, the
2752        // top position is not affected.
2753        mTempXY[0] = getViewportOffsetX() + getPaddingLeft() + boundingLayout.getLeft();
2754        mTempXY[1] = child.getTop() + boundingLayout.getTop();
2755
2756        float scale = mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY);
2757        outArea.set(mTempXY[0], mTempXY[1],
2758                (int) (mTempXY[0] + scale * boundingLayout.getMeasuredWidth()),
2759                (int) (mTempXY[1] + scale * boundingLayout.getMeasuredHeight()));
2760    }
2761
2762    @Override
2763    public void onDragEnter(DragObject d) {
2764        if (ENFORCE_DRAG_EVENT_ORDER) {
2765            enforceDragParity("onDragEnter", 1, 1);
2766        }
2767
2768        mCreateUserFolderOnDrop = false;
2769        mAddToExistingFolderOnDrop = false;
2770
2771        mDropToLayout = null;
2772        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2773        setDropLayoutForDragObject(d, mDragViewVisualCenter[0], mDragViewVisualCenter[1]);
2774    }
2775
2776    @Override
2777    public void onDragExit(DragObject d) {
2778        if (ENFORCE_DRAG_EVENT_ORDER) {
2779            enforceDragParity("onDragExit", -1, 0);
2780        }
2781
2782        // Here we store the final page that will be dropped to, if the workspace in fact
2783        // receives the drop
2784        mDropToLayout = mDragTargetLayout;
2785        if (mDragMode == DRAG_MODE_CREATE_FOLDER) {
2786            mCreateUserFolderOnDrop = true;
2787        } else if (mDragMode == DRAG_MODE_ADD_TO_FOLDER) {
2788            mAddToExistingFolderOnDrop = true;
2789        }
2790
2791        // Reset the previous drag target
2792        setCurrentDropLayout(null);
2793        setCurrentDragOverlappingLayout(null);
2794
2795        mSpringLoadedDragController.cancel();
2796    }
2797
2798    private void enforceDragParity(String event, int update, int expectedValue) {
2799        enforceDragParity(this, event, update, expectedValue);
2800        for (int i = 0; i < getChildCount(); i++) {
2801            enforceDragParity(getChildAt(i), event, update, expectedValue);
2802        }
2803    }
2804
2805    private void enforceDragParity(View v, String event, int update, int expectedValue) {
2806        Object tag = v.getTag(R.id.drag_event_parity);
2807        int value = tag == null ? 0 : (Integer) tag;
2808        value += update;
2809        v.setTag(R.id.drag_event_parity, value);
2810
2811        if (value != expectedValue) {
2812            Log.e(TAG, event + ": Drag contract violated: " + value);
2813        }
2814    }
2815
2816    void setCurrentDropLayout(CellLayout layout) {
2817        if (mDragTargetLayout != null) {
2818            mDragTargetLayout.revertTempState();
2819            mDragTargetLayout.onDragExit();
2820        }
2821        mDragTargetLayout = layout;
2822        if (mDragTargetLayout != null) {
2823            mDragTargetLayout.onDragEnter();
2824        }
2825        cleanupReorder(true);
2826        cleanupFolderCreation();
2827        setCurrentDropOverCell(-1, -1);
2828    }
2829
2830    void setCurrentDragOverlappingLayout(CellLayout layout) {
2831        if (mDragOverlappingLayout != null) {
2832            mDragOverlappingLayout.setIsDragOverlapping(false);
2833        }
2834        mDragOverlappingLayout = layout;
2835        if (mDragOverlappingLayout != null) {
2836            mDragOverlappingLayout.setIsDragOverlapping(true);
2837        }
2838        // Invalidating the scrim will also force this CellLayout
2839        // to be invalidated so that it is highlighted if necessary.
2840        mLauncher.getDragLayer().invalidateScrim();
2841    }
2842
2843    public CellLayout getCurrentDragOverlappingLayout() {
2844        return mDragOverlappingLayout;
2845    }
2846
2847    void setCurrentDropOverCell(int x, int y) {
2848        if (x != mDragOverX || y != mDragOverY) {
2849            mDragOverX = x;
2850            mDragOverY = y;
2851            setDragMode(DRAG_MODE_NONE);
2852        }
2853    }
2854
2855    void setDragMode(int dragMode) {
2856        if (dragMode != mDragMode) {
2857            if (dragMode == DRAG_MODE_NONE) {
2858                cleanupAddToFolder();
2859                // We don't want to cancel the re-order alarm every time the target cell changes
2860                // as this feels to slow / unresponsive.
2861                cleanupReorder(false);
2862                cleanupFolderCreation();
2863            } else if (dragMode == DRAG_MODE_ADD_TO_FOLDER) {
2864                cleanupReorder(true);
2865                cleanupFolderCreation();
2866            } else if (dragMode == DRAG_MODE_CREATE_FOLDER) {
2867                cleanupAddToFolder();
2868                cleanupReorder(true);
2869            } else if (dragMode == DRAG_MODE_REORDER) {
2870                cleanupAddToFolder();
2871                cleanupFolderCreation();
2872            }
2873            mDragMode = dragMode;
2874        }
2875    }
2876
2877    private void cleanupFolderCreation() {
2878        if (mFolderCreateBg != null) {
2879            mFolderCreateBg.animateToRest();
2880        }
2881        mFolderCreationAlarm.setOnAlarmListener(null);
2882        mFolderCreationAlarm.cancelAlarm();
2883    }
2884
2885    private void cleanupAddToFolder() {
2886        if (mDragOverFolderIcon != null) {
2887            mDragOverFolderIcon.onDragExit();
2888            mDragOverFolderIcon = null;
2889        }
2890    }
2891
2892    private void cleanupReorder(boolean cancelAlarm) {
2893        // Any pending reorders are canceled
2894        if (cancelAlarm) {
2895            mReorderAlarm.cancelAlarm();
2896        }
2897        mLastReorderX = -1;
2898        mLastReorderY = -1;
2899    }
2900
2901   /*
2902    *
2903    * Convert the 2D coordinate xy from the parent View's coordinate space to this CellLayout's
2904    * coordinate space. The argument xy is modified with the return result.
2905    */
2906   void mapPointFromSelfToChild(View v, float[] xy) {
2907       xy[0] = xy[0] - v.getLeft();
2908       xy[1] = xy[1] - v.getTop();
2909   }
2910
2911   boolean isPointInSelfOverHotseat(int x, int y) {
2912       mTempXY[0] = x;
2913       mTempXY[1] = y;
2914       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2915       View hotseat = mLauncher.getHotseat();
2916       return mTempXY[0] >= hotseat.getLeft() &&
2917               mTempXY[0] <= hotseat.getRight() &&
2918               mTempXY[1] >= hotseat.getTop() &&
2919               mTempXY[1] <= hotseat.getBottom();
2920   }
2921
2922   void mapPointFromSelfToHotseatLayout(Hotseat hotseat, float[] xy) {
2923       mTempXY[0] = (int) xy[0];
2924       mTempXY[1] = (int) xy[1];
2925       mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(this, mTempXY, true);
2926       mLauncher.getDragLayer().mapCoordInSelfToDescendant(hotseat.getLayout(), mTempXY);
2927
2928       xy[0] = mTempXY[0];
2929       xy[1] = mTempXY[1];
2930   }
2931
2932   /*
2933    *
2934    * Convert the 2D coordinate xy from this CellLayout's coordinate space to
2935    * the parent View's coordinate space. The argument xy is modified with the return result.
2936    *
2937    */
2938   void mapPointFromChildToSelf(View v, float[] xy) {
2939       xy[0] += v.getLeft();
2940       xy[1] += v.getTop();
2941   }
2942
2943    private boolean isDragWidget(DragObject d) {
2944        return (d.dragInfo instanceof LauncherAppWidgetInfo ||
2945                d.dragInfo instanceof PendingAddWidgetInfo);
2946    }
2947
2948    public void onDragOver(DragObject d) {
2949        // Skip drag over events while we are dragging over side pages
2950        if (!transitionStateShouldAllowDrop()) return;
2951
2952        ItemInfo item = d.dragInfo;
2953        if (item == null) {
2954            if (ProviderConfig.IS_DOGFOOD_BUILD) {
2955                throw new NullPointerException("DragObject has null info");
2956            }
2957            return;
2958        }
2959
2960        // Ensure that we have proper spans for the item that we are dropping
2961        if (item.spanX < 0 || item.spanY < 0) throw new RuntimeException("Improper spans found");
2962        mDragViewVisualCenter = d.getVisualCenter(mDragViewVisualCenter);
2963
2964        final View child = (mDragInfo == null) ? null : mDragInfo.cell;
2965        if (setDropLayoutForDragObject(d, mDragViewVisualCenter[0], mDragViewVisualCenter[1])) {
2966            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
2967                mSpringLoadedDragController.cancel();
2968            } else {
2969                mSpringLoadedDragController.setAlarm(mDragTargetLayout);
2970            }
2971        }
2972
2973        // Handle the drag over
2974        if (mDragTargetLayout != null) {
2975            // We want the point to be mapped to the dragTarget.
2976            if (mLauncher.isHotseatLayout(mDragTargetLayout)) {
2977                mapPointFromSelfToHotseatLayout(mLauncher.getHotseat(), mDragViewVisualCenter);
2978            } else {
2979                mapPointFromSelfToChild(mDragTargetLayout, mDragViewVisualCenter);
2980            }
2981
2982            int minSpanX = item.spanX;
2983            int minSpanY = item.spanY;
2984            if (item.minSpanX > 0 && item.minSpanY > 0) {
2985                minSpanX = item.minSpanX;
2986                minSpanY = item.minSpanY;
2987            }
2988
2989            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
2990                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY,
2991                    mDragTargetLayout, mTargetCell);
2992            int reorderX = mTargetCell[0];
2993            int reorderY = mTargetCell[1];
2994
2995            setCurrentDropOverCell(mTargetCell[0], mTargetCell[1]);
2996
2997            float targetCellDistance = mDragTargetLayout.getDistanceFromCell(
2998                    mDragViewVisualCenter[0], mDragViewVisualCenter[1], mTargetCell);
2999
3000            manageFolderFeedback(mDragTargetLayout, mTargetCell, targetCellDistance, d);
3001
3002            boolean nearestDropOccupied = mDragTargetLayout.isNearestDropLocationOccupied((int)
3003                    mDragViewVisualCenter[0], (int) mDragViewVisualCenter[1], item.spanX,
3004                    item.spanY, child, mTargetCell);
3005
3006            if (!nearestDropOccupied) {
3007                mDragTargetLayout.visualizeDropLocation(child, mOutlineProvider,
3008                        mTargetCell[0], mTargetCell[1], item.spanX, item.spanY, false, d);
3009            } else if ((mDragMode == DRAG_MODE_NONE || mDragMode == DRAG_MODE_REORDER)
3010                    && !mReorderAlarm.alarmPending() && (mLastReorderX != reorderX ||
3011                    mLastReorderY != reorderY)) {
3012
3013                int[] resultSpan = new int[2];
3014                mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3015                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, item.spanX, item.spanY,
3016                        child, mTargetCell, resultSpan, CellLayout.MODE_SHOW_REORDER_HINT);
3017
3018                // Otherwise, if we aren't adding to or creating a folder and there's no pending
3019                // reorder, then we schedule a reorder
3020                ReorderAlarmListener listener = new ReorderAlarmListener(mDragViewVisualCenter,
3021                        minSpanX, minSpanY, item.spanX, item.spanY, d, child);
3022                mReorderAlarm.setOnAlarmListener(listener);
3023                mReorderAlarm.setAlarm(REORDER_TIMEOUT);
3024            }
3025
3026            if (mDragMode == DRAG_MODE_CREATE_FOLDER || mDragMode == DRAG_MODE_ADD_TO_FOLDER ||
3027                    !nearestDropOccupied) {
3028                if (mDragTargetLayout != null) {
3029                    mDragTargetLayout.revertTempState();
3030                }
3031            }
3032        }
3033    }
3034
3035    /**
3036     * Updates {@link #mDragTargetLayout} and {@link #mDragOverlappingLayout}
3037     * based on the DragObject's position.
3038     *
3039     * The layout will be:
3040     * - The Hotseat if the drag object is over it
3041     * - A side page if we are in spring-loaded mode and the drag object is over it
3042     * - The current page otherwise
3043     *
3044     * @return whether the layout is different from the current {@link #mDragTargetLayout}.
3045     */
3046    private boolean setDropLayoutForDragObject(DragObject d, float centerX, float centerY) {
3047        CellLayout layout = null;
3048        // Test to see if we are over the hotseat first
3049        if (mLauncher.getHotseat() != null && !isDragWidget(d)) {
3050            if (isPointInSelfOverHotseat(d.x, d.y)) {
3051                layout = mLauncher.getHotseat().getLayout();
3052            }
3053        }
3054
3055        int nextPage = getNextPage();
3056        if (layout == null && !isPageInTransition()) {
3057            // Check if the item is dragged over left page
3058            mTempTouchCoordinates[0] = Math.min(centerX, d.x);
3059            mTempTouchCoordinates[1] = d.y;
3060            layout = verifyInsidePage(nextPage + (mIsRtl ? 1 : -1), mTempTouchCoordinates);
3061        }
3062
3063        if (layout == null && !isPageInTransition()) {
3064            // Check if the item is dragged over right page
3065            mTempTouchCoordinates[0] = Math.max(centerX, d.x);
3066            mTempTouchCoordinates[1] = d.y;
3067            layout = verifyInsidePage(nextPage + (mIsRtl ? -1 : 1), mTempTouchCoordinates);
3068        }
3069
3070        // Always pick the current page.
3071        if (layout == null && nextPage >= numCustomPages() && nextPage < getPageCount()) {
3072            layout = (CellLayout) getChildAt(nextPage);
3073        }
3074        if (layout != mDragTargetLayout) {
3075            setCurrentDropLayout(layout);
3076            setCurrentDragOverlappingLayout(layout);
3077            return true;
3078        }
3079        return false;
3080    }
3081
3082    /**
3083     * Returns the child CellLayout if the point is inside the page coordinates, null otherwise.
3084     */
3085    private CellLayout verifyInsidePage(int pageNo, float[] touchXy)  {
3086        if (pageNo >= numCustomPages() && pageNo < getPageCount()) {
3087            CellLayout cl = (CellLayout) getChildAt(pageNo);
3088            mapPointFromSelfToChild(cl, touchXy);
3089            if (touchXy[0] >= 0 && touchXy[0] <= cl.getWidth() &&
3090                    touchXy[1] >= 0 && touchXy[1] <= cl.getHeight()) {
3091                // This point is inside the cell layout
3092                return cl;
3093            }
3094        }
3095        return null;
3096    }
3097
3098    private void manageFolderFeedback(CellLayout targetLayout,
3099            int[] targetCell, float distance, DragObject dragObject) {
3100        if (distance > mMaxDistanceForFolderCreation) return;
3101
3102        final View dragOverView = mDragTargetLayout.getChildAt(mTargetCell[0], mTargetCell[1]);
3103        ItemInfo info = dragObject.dragInfo;
3104        boolean userFolderPending = willCreateUserFolder(info, dragOverView, false);
3105        if (mDragMode == DRAG_MODE_NONE && userFolderPending &&
3106                !mFolderCreationAlarm.alarmPending()) {
3107
3108            FolderCreationAlarmListener listener = new
3109                    FolderCreationAlarmListener(targetLayout, targetCell[0], targetCell[1]);
3110
3111            if (!dragObject.accessibleDrag) {
3112                mFolderCreationAlarm.setOnAlarmListener(listener);
3113                mFolderCreationAlarm.setAlarm(FOLDER_CREATION_TIMEOUT);
3114            } else {
3115                listener.onAlarm(mFolderCreationAlarm);
3116            }
3117
3118            if (dragObject.stateAnnouncer != null) {
3119                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3120                        .getDescriptionForDropOver(dragOverView, getContext()));
3121            }
3122            return;
3123        }
3124
3125        boolean willAddToFolder = willAddToExistingUserFolder(info, dragOverView);
3126        if (willAddToFolder && mDragMode == DRAG_MODE_NONE) {
3127            mDragOverFolderIcon = ((FolderIcon) dragOverView);
3128            mDragOverFolderIcon.onDragEnter(info);
3129            if (targetLayout != null) {
3130                targetLayout.clearDragOutlines();
3131            }
3132            setDragMode(DRAG_MODE_ADD_TO_FOLDER);
3133
3134            if (dragObject.stateAnnouncer != null) {
3135                dragObject.stateAnnouncer.announce(WorkspaceAccessibilityHelper
3136                        .getDescriptionForDropOver(dragOverView, getContext()));
3137            }
3138            return;
3139        }
3140
3141        if (mDragMode == DRAG_MODE_ADD_TO_FOLDER && !willAddToFolder) {
3142            setDragMode(DRAG_MODE_NONE);
3143        }
3144        if (mDragMode == DRAG_MODE_CREATE_FOLDER && !userFolderPending) {
3145            setDragMode(DRAG_MODE_NONE);
3146        }
3147    }
3148
3149    class FolderCreationAlarmListener implements OnAlarmListener {
3150        CellLayout layout;
3151        int cellX;
3152        int cellY;
3153
3154        FolderIcon.PreviewBackground bg = new FolderIcon.PreviewBackground();
3155
3156        public FolderCreationAlarmListener(CellLayout layout, int cellX, int cellY) {
3157            this.layout = layout;
3158            this.cellX = cellX;
3159            this.cellY = cellY;
3160
3161            DeviceProfile grid = mLauncher.getDeviceProfile();
3162            BubbleTextView cell = (BubbleTextView) layout.getChildAt(cellX, cellY);
3163
3164            bg.setup(getResources().getDisplayMetrics(), grid, null,
3165                    cell.getMeasuredWidth(), cell.getPaddingTop());
3166
3167            // The full preview background should appear behind the icon
3168            bg.isClipping = false;
3169        }
3170
3171        public void onAlarm(Alarm alarm) {
3172            mFolderCreateBg = bg;
3173            mFolderCreateBg.animateToAccept(layout, cellX, cellY);
3174            layout.clearDragOutlines();
3175            setDragMode(DRAG_MODE_CREATE_FOLDER);
3176        }
3177    }
3178
3179    class ReorderAlarmListener implements OnAlarmListener {
3180        float[] dragViewCenter;
3181        int minSpanX, minSpanY, spanX, spanY;
3182        DragObject dragObject;
3183        View child;
3184
3185        public ReorderAlarmListener(float[] dragViewCenter, int minSpanX, int minSpanY, int spanX,
3186                int spanY, DragObject dragObject, View child) {
3187            this.dragViewCenter = dragViewCenter;
3188            this.minSpanX = minSpanX;
3189            this.minSpanY = minSpanY;
3190            this.spanX = spanX;
3191            this.spanY = spanY;
3192            this.child = child;
3193            this.dragObject = dragObject;
3194        }
3195
3196        public void onAlarm(Alarm alarm) {
3197            int[] resultSpan = new int[2];
3198            mTargetCell = findNearestArea((int) mDragViewVisualCenter[0],
3199                    (int) mDragViewVisualCenter[1], minSpanX, minSpanY, mDragTargetLayout,
3200                    mTargetCell);
3201            mLastReorderX = mTargetCell[0];
3202            mLastReorderY = mTargetCell[1];
3203
3204            mTargetCell = mDragTargetLayout.performReorder((int) mDragViewVisualCenter[0],
3205                (int) mDragViewVisualCenter[1], minSpanX, minSpanY, spanX, spanY,
3206                child, mTargetCell, resultSpan, CellLayout.MODE_DRAG_OVER);
3207
3208            if (mTargetCell[0] < 0 || mTargetCell[1] < 0) {
3209                mDragTargetLayout.revertTempState();
3210            } else {
3211                setDragMode(DRAG_MODE_REORDER);
3212            }
3213
3214            boolean resize = resultSpan[0] != spanX || resultSpan[1] != spanY;
3215            mDragTargetLayout.visualizeDropLocation(child, mOutlineProvider,
3216                mTargetCell[0], mTargetCell[1], resultSpan[0], resultSpan[1], resize, dragObject);
3217        }
3218    }
3219
3220    @Override
3221    public void getHitRectRelativeToDragLayer(Rect outRect) {
3222        // We want the workspace to have the whole area of the display (it will find the correct
3223        // cell layout to drop to in the existing drag/drop logic.
3224        mLauncher.getDragLayer().getDescendantRectRelativeToSelf(this, outRect);
3225    }
3226
3227    /**
3228     * Drop an item that didn't originate on one of the workspace screens.
3229     * It may have come from Launcher (e.g. from all apps or customize), or it may have
3230     * come from another app altogether.
3231     *
3232     * NOTE: This can also be called when we are outside of a drag event, when we want
3233     * to add an item to one of the workspace screens.
3234     */
3235    private void onDropExternal(final int[] touchXY, final CellLayout cellLayout, DragObject d) {
3236        final Runnable exitSpringLoadedRunnable = new Runnable() {
3237            @Override
3238            public void run() {
3239                mLauncher.exitSpringLoadedDragModeDelayed(true,
3240                        Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
3241            }
3242        };
3243
3244        if (d.dragInfo instanceof PendingAddShortcutInfo) {
3245            ShortcutInfo si = ((PendingAddShortcutInfo) d.dragInfo)
3246                    .activityInfo.createShortcutInfo();
3247            if (si != null) {
3248                d.dragInfo = si;
3249            }
3250        }
3251
3252        ItemInfo info = d.dragInfo;
3253        int spanX = info.spanX;
3254        int spanY = info.spanY;
3255        if (mDragInfo != null) {
3256            spanX = mDragInfo.spanX;
3257            spanY = mDragInfo.spanY;
3258        }
3259
3260        final long container = mLauncher.isHotseatLayout(cellLayout) ?
3261                LauncherSettings.Favorites.CONTAINER_HOTSEAT :
3262                    LauncherSettings.Favorites.CONTAINER_DESKTOP;
3263        final long screenId = getIdForScreen(cellLayout);
3264        if (!mLauncher.isHotseatLayout(cellLayout)
3265                && screenId != getScreenIdForPageIndex(mCurrentPage)
3266                && mState != State.SPRING_LOADED) {
3267            snapToScreenId(screenId, null);
3268        }
3269
3270        if (info instanceof PendingAddItemInfo) {
3271            final PendingAddItemInfo pendingInfo = (PendingAddItemInfo) info;
3272
3273            boolean findNearestVacantCell = true;
3274            if (pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT) {
3275                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3276                        cellLayout, mTargetCell);
3277                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3278                        mDragViewVisualCenter[1], mTargetCell);
3279                if (willCreateUserFolder(d.dragInfo, cellLayout, mTargetCell, distance, true)
3280                        || willAddToExistingUserFolder(
3281                                d.dragInfo, cellLayout, mTargetCell, distance)) {
3282                    findNearestVacantCell = false;
3283                }
3284            }
3285
3286            final ItemInfo item = d.dragInfo;
3287            boolean updateWidgetSize = false;
3288            if (findNearestVacantCell) {
3289                int minSpanX = item.spanX;
3290                int minSpanY = item.spanY;
3291                if (item.minSpanX > 0 && item.minSpanY > 0) {
3292                    minSpanX = item.minSpanX;
3293                    minSpanY = item.minSpanY;
3294                }
3295                int[] resultSpan = new int[2];
3296                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3297                        (int) mDragViewVisualCenter[1], minSpanX, minSpanY, info.spanX, info.spanY,
3298                        null, mTargetCell, resultSpan, CellLayout.MODE_ON_DROP_EXTERNAL);
3299
3300                if (resultSpan[0] != item.spanX || resultSpan[1] != item.spanY) {
3301                    updateWidgetSize = true;
3302                }
3303                item.spanX = resultSpan[0];
3304                item.spanY = resultSpan[1];
3305            }
3306
3307            Runnable onAnimationCompleteRunnable = new Runnable() {
3308                @Override
3309                public void run() {
3310                    // Normally removeExtraEmptyScreen is called in Workspace#onDragEnd, but when
3311                    // adding an item that may not be dropped right away (due to a config activity)
3312                    // we defer the removal until the activity returns.
3313                    deferRemoveExtraEmptyScreen();
3314
3315                    // When dragging and dropping from customization tray, we deal with creating
3316                    // widgets/shortcuts/folders in a slightly different way
3317                    mLauncher.addPendingItem(pendingInfo, container, screenId, mTargetCell,
3318                            item.spanX, item.spanY);
3319                }
3320            };
3321            boolean isWidget = pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET
3322                    || pendingInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3323
3324            AppWidgetHostView finalView = isWidget ?
3325                    ((PendingAddWidgetInfo) pendingInfo).boundWidget : null;
3326
3327            if (finalView != null && updateWidgetSize) {
3328                AppWidgetResizeFrame.updateWidgetSizeRanges(finalView, mLauncher, item.spanX,
3329                        item.spanY);
3330            }
3331
3332            int animationStyle = ANIMATE_INTO_POSITION_AND_DISAPPEAR;
3333            if (isWidget && ((PendingAddWidgetInfo) pendingInfo).info != null &&
3334                    ((PendingAddWidgetInfo) pendingInfo).getHandler().needsConfigure()) {
3335                animationStyle = ANIMATE_INTO_POSITION_AND_REMAIN;
3336            }
3337            animateWidgetDrop(info, cellLayout, d.dragView, onAnimationCompleteRunnable,
3338                    animationStyle, finalView, true);
3339        } else {
3340            // This is for other drag/drop cases, like dragging from All Apps
3341            View view = null;
3342
3343            switch (info.itemType) {
3344            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
3345            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
3346            case LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT:
3347                if (info.container == NO_ID && info instanceof AppInfo) {
3348                    // Came from all apps -- make a copy
3349                    info = ((AppInfo) info).makeShortcut();
3350                    d.dragInfo = info;
3351                }
3352                view = mLauncher.createShortcut(cellLayout, (ShortcutInfo) info);
3353                break;
3354            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
3355                view = FolderIcon.fromXml(R.layout.folder_icon, mLauncher, cellLayout,
3356                        (FolderInfo) info);
3357                break;
3358            default:
3359                throw new IllegalStateException("Unknown item type: " + info.itemType);
3360            }
3361
3362            // First we find the cell nearest to point at which the item is
3363            // dropped, without any consideration to whether there is an item there.
3364            if (touchXY != null) {
3365                mTargetCell = findNearestArea((int) touchXY[0], (int) touchXY[1], spanX, spanY,
3366                        cellLayout, mTargetCell);
3367                float distance = cellLayout.getDistanceFromCell(mDragViewVisualCenter[0],
3368                        mDragViewVisualCenter[1], mTargetCell);
3369                d.postAnimationRunnable = exitSpringLoadedRunnable;
3370                if (createUserFolderIfNecessary(view, container, cellLayout, mTargetCell, distance,
3371                        true, d.dragView, d.postAnimationRunnable)) {
3372                    return;
3373                }
3374                if (addToExistingFolderIfNecessary(view, cellLayout, mTargetCell, distance, d,
3375                        true)) {
3376                    return;
3377                }
3378            }
3379
3380            if (touchXY != null) {
3381                // when dragging and dropping, just find the closest free spot
3382                mTargetCell = cellLayout.performReorder((int) mDragViewVisualCenter[0],
3383                        (int) mDragViewVisualCenter[1], 1, 1, 1, 1,
3384                        null, mTargetCell, null, CellLayout.MODE_ON_DROP_EXTERNAL);
3385            } else {
3386                cellLayout.findCellForSpan(mTargetCell, 1, 1);
3387            }
3388            // Add the item to DB before adding to screen ensures that the container and other
3389            // values of the info is properly updated.
3390            mLauncher.getModelWriter().addOrMoveItemInDatabase(info, container, screenId,
3391                    mTargetCell[0], mTargetCell[1]);
3392
3393            addInScreen(view, container, screenId, mTargetCell[0], mTargetCell[1],
3394                    info.spanX, info.spanY);
3395            cellLayout.onDropChild(view);
3396            cellLayout.getShortcutsAndWidgets().measureChild(view);
3397
3398            if (d.dragView != null) {
3399                // We wrap the animation call in the temporary set and reset of the current
3400                // cellLayout to its final transform -- this means we animate the drag view to
3401                // the correct final location.
3402                setFinalTransitionTransform(cellLayout);
3403                mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, view,
3404                        exitSpringLoadedRunnable, this);
3405                resetTransitionTransform(cellLayout);
3406            }
3407        }
3408    }
3409
3410    public Bitmap createWidgetBitmap(ItemInfo widgetInfo, View layout) {
3411        int[] unScaledSize = mLauncher.getWorkspace().estimateItemSize(widgetInfo, false, true);
3412        int visibility = layout.getVisibility();
3413        layout.setVisibility(VISIBLE);
3414
3415        int width = MeasureSpec.makeMeasureSpec(unScaledSize[0], MeasureSpec.EXACTLY);
3416        int height = MeasureSpec.makeMeasureSpec(unScaledSize[1], MeasureSpec.EXACTLY);
3417        Bitmap b = Bitmap.createBitmap(unScaledSize[0], unScaledSize[1],
3418                Bitmap.Config.ARGB_8888);
3419        mCanvas.setBitmap(b);
3420
3421        layout.measure(width, height);
3422        layout.layout(0, 0, unScaledSize[0], unScaledSize[1]);
3423        layout.draw(mCanvas);
3424        mCanvas.setBitmap(null);
3425        layout.setVisibility(visibility);
3426        return b;
3427    }
3428
3429    private void getFinalPositionForDropAnimation(int[] loc, float[] scaleXY,
3430            DragView dragView, CellLayout layout, ItemInfo info, int[] targetCell, boolean scale) {
3431        // Now we animate the dragView, (ie. the widget or shortcut preview) into its final
3432        // location and size on the home screen.
3433        int spanX = info.spanX;
3434        int spanY = info.spanY;
3435
3436        Rect r = estimateItemPosition(layout, targetCell[0], targetCell[1], spanX, spanY);
3437        if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET) {
3438            DeviceProfile profile = mLauncher.getDeviceProfile();
3439            Utilities.shrinkRect(r, profile.appWidgetScale.x, profile.appWidgetScale.y);
3440        }
3441        loc[0] = r.left;
3442        loc[1] = r.top;
3443
3444        setFinalTransitionTransform(layout);
3445        float cellLayoutScale =
3446                mLauncher.getDragLayer().getDescendantCoordRelativeToSelf(layout, loc, true);
3447        resetTransitionTransform(layout);
3448
3449        if (scale) {
3450            float dragViewScaleX = (1.0f * r.width()) / dragView.getMeasuredWidth();
3451            float dragViewScaleY = (1.0f * r.height()) / dragView.getMeasuredHeight();
3452
3453            // The animation will scale the dragView about its center, so we need to center about
3454            // the final location.
3455            loc[0] -= (dragView.getMeasuredWidth() - cellLayoutScale * r.width()) / 2
3456                    - Math.ceil(layout.getUnusedHorizontalSpace() / 2f);
3457            loc[1] -= (dragView.getMeasuredHeight() - cellLayoutScale * r.height()) / 2;
3458            scaleXY[0] = dragViewScaleX * cellLayoutScale;
3459            scaleXY[1] = dragViewScaleY * cellLayoutScale;
3460        } else {
3461            // Since we are not cross-fading the dragView, align the drag view to the
3462            // final cell position.
3463            float dragScale = dragView.getInitialScale() * cellLayoutScale;
3464            loc[0] += (dragScale - 1) * dragView.getWidth() / 2;
3465            loc[1] += (dragScale - 1) * dragView.getHeight() / 2;
3466            scaleXY[0] = scaleXY[1] = dragScale;
3467
3468            // If a dragRegion was provided, offset the final position accordingly.
3469            Rect dragRegion = dragView.getDragRegion();
3470            if (dragRegion != null) {
3471                loc[0] += cellLayoutScale * dragRegion.left;
3472                loc[1] += cellLayoutScale * dragRegion.top;
3473            }
3474        }
3475    }
3476
3477    public void animateWidgetDrop(ItemInfo info, CellLayout cellLayout, final DragView dragView,
3478            final Runnable onCompleteRunnable, int animationType, final View finalView,
3479            boolean external) {
3480        Rect from = new Rect();
3481        mLauncher.getDragLayer().getViewRectRelativeToSelf(dragView, from);
3482
3483        int[] finalPos = new int[2];
3484        float scaleXY[] = new float[2];
3485        boolean scalePreview = !(info instanceof PendingAddShortcutInfo);
3486        getFinalPositionForDropAnimation(finalPos, scaleXY, dragView, cellLayout, info, mTargetCell,
3487                scalePreview);
3488
3489        Resources res = mLauncher.getResources();
3490        final int duration = res.getInteger(R.integer.config_dropAnimMaxDuration) - 200;
3491
3492        boolean isWidget = info.itemType == LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET ||
3493                info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET;
3494        if ((animationType == ANIMATE_INTO_POSITION_AND_RESIZE || external) && finalView != null) {
3495            Bitmap crossFadeBitmap = createWidgetBitmap(info, finalView);
3496            dragView.setCrossFadeBitmap(crossFadeBitmap);
3497            dragView.crossFade((int) (duration * 0.8f));
3498        } else if (isWidget && external) {
3499            scaleXY[0] = scaleXY[1] = Math.min(scaleXY[0],  scaleXY[1]);
3500        }
3501
3502        DragLayer dragLayer = mLauncher.getDragLayer();
3503        if (animationType == CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION) {
3504            mLauncher.getDragLayer().animateViewIntoPosition(dragView, finalPos, 0f, 0.1f, 0.1f,
3505                    DragLayer.ANIMATION_END_DISAPPEAR, onCompleteRunnable, duration);
3506        } else {
3507            int endStyle;
3508            if (animationType == ANIMATE_INTO_POSITION_AND_REMAIN) {
3509                endStyle = DragLayer.ANIMATION_END_REMAIN_VISIBLE;
3510            } else {
3511                endStyle = DragLayer.ANIMATION_END_DISAPPEAR;
3512            }
3513
3514            Runnable onComplete = new Runnable() {
3515                @Override
3516                public void run() {
3517                    if (finalView != null) {
3518                        finalView.setVisibility(VISIBLE);
3519                    }
3520                    if (onCompleteRunnable != null) {
3521                        onCompleteRunnable.run();
3522                    }
3523                }
3524            };
3525            dragLayer.animateViewIntoPosition(dragView, from.left, from.top, finalPos[0],
3526                    finalPos[1], 1, 1, 1, scaleXY[0], scaleXY[1], onComplete, endStyle,
3527                    duration, this);
3528        }
3529    }
3530
3531    public void setFinalTransitionTransform(CellLayout layout) {
3532        if (isSwitchingState()) {
3533            mCurrentScale = getScaleX();
3534            setScaleX(mStateTransitionAnimation.getFinalScale());
3535            setScaleY(mStateTransitionAnimation.getFinalScale());
3536        }
3537    }
3538    public void resetTransitionTransform(CellLayout layout) {
3539        if (isSwitchingState()) {
3540            setScaleX(mCurrentScale);
3541            setScaleY(mCurrentScale);
3542        }
3543    }
3544
3545    public WorkspaceStateTransitionAnimation getStateTransitionAnimation() {
3546        return mStateTransitionAnimation;
3547    }
3548
3549    /**
3550     * Return the current CellInfo describing our current drag; this method exists
3551     * so that Launcher can sync this object with the correct info when the activity is created/
3552     * destroyed
3553     *
3554     */
3555    public CellLayout.CellInfo getDragInfo() {
3556        return mDragInfo;
3557    }
3558
3559    public int getCurrentPageOffsetFromCustomContent() {
3560        return getNextPage() - numCustomPages();
3561    }
3562
3563    /**
3564     * Calculate the nearest cell where the given object would be dropped.
3565     *
3566     * pixelX and pixelY should be in the coordinate system of layout
3567     */
3568    @Thunk int[] findNearestArea(int pixelX, int pixelY,
3569            int spanX, int spanY, CellLayout layout, int[] recycle) {
3570        return layout.findNearestArea(
3571                pixelX, pixelY, spanX, spanY, recycle);
3572    }
3573
3574    void setup(DragController dragController) {
3575        mSpringLoadedDragController = new SpringLoadedDragController(mLauncher);
3576        mDragController = dragController;
3577
3578        // hardware layers on children are enabled on startup, but should be disabled until
3579        // needed
3580        updateChildrenLayersEnabled(false);
3581    }
3582
3583    /**
3584     * Called at the end of a drag which originated on the workspace.
3585     */
3586    public void onDropCompleted(final View target, final DragObject d,
3587            final boolean isFlingToDelete, final boolean success) {
3588        if (mDeferDropAfterUninstall) {
3589            final CellLayout.CellInfo dragInfo = mDragInfo;
3590            mDeferredAction = new Runnable() {
3591                public void run() {
3592                    mDragInfo = dragInfo; // Restore the drag info that was cleared in onDragEnd()
3593                    onDropCompleted(target, d, isFlingToDelete, success);
3594                    mDeferredAction = null;
3595                }
3596            };
3597            return;
3598        }
3599
3600        boolean beingCalledAfterUninstall = mDeferredAction != null;
3601
3602        if (success && !(beingCalledAfterUninstall && !mUninstallSuccessful)) {
3603            if (target != this && mDragInfo != null) {
3604                removeWorkspaceItem(mDragInfo.cell);
3605            }
3606        } else if (mDragInfo != null) {
3607            final CellLayout cellLayout = mLauncher.getCellLayout(
3608                    mDragInfo.container, mDragInfo.screenId);
3609            if (cellLayout != null) {
3610                cellLayout.onDropChild(mDragInfo.cell);
3611            } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3612                throw new RuntimeException("Invalid state: cellLayout == null in "
3613                        + "Workspace#onDropCompleted. Please file a bug. ");
3614            };
3615        }
3616        if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
3617                && mDragInfo.cell != null) {
3618            mDragInfo.cell.setVisibility(VISIBLE);
3619        }
3620        mDragInfo = null;
3621
3622        if (!isFlingToDelete) {
3623            // Fling to delete already exits spring loaded mode after the animation finishes.
3624            mLauncher.exitSpringLoadedDragModeDelayed(success,
3625                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, mDelayedResizeRunnable);
3626            mDelayedResizeRunnable = null;
3627        }
3628    }
3629
3630    /**
3631     * For opposite operation. See {@link #addInScreen}.
3632     */
3633    public void removeWorkspaceItem(View v) {
3634        CellLayout parentCell = getParentCellLayoutForView(v);
3635        if (parentCell != null) {
3636            parentCell.removeView(v);
3637        } else if (ProviderConfig.IS_DOGFOOD_BUILD) {
3638            // When an app is uninstalled using the drop target, we wait until resume to remove
3639            // the icon. We also remove all the corresponding items from the workspace at
3640            // {@link Launcher#bindComponentsRemoved}. That call can come before or after
3641            // {@link Launcher#mOnResumeCallbacks} depending on how busy the worker thread is.
3642            Log.e(TAG, "mDragInfo.cell has null parent");
3643        }
3644        if (v instanceof DropTarget) {
3645            mDragController.removeDropTarget((DropTarget) v);
3646        }
3647    }
3648
3649    /**
3650     * Removes all folder listeners
3651     */
3652    public void removeFolderListeners() {
3653        mapOverItems(false, new ItemOperator() {
3654            @Override
3655            public boolean evaluate(ItemInfo info, View view) {
3656                if (view instanceof FolderIcon) {
3657                    ((FolderIcon) view).removeListeners();
3658                }
3659                return false;
3660            }
3661        });
3662    }
3663
3664    @Override
3665    public void deferCompleteDropAfterUninstallActivity() {
3666        mDeferDropAfterUninstall = true;
3667    }
3668
3669    /// maybe move this into a smaller part
3670    @Override
3671    public void onDragObjectRemoved(boolean success) {
3672        mDeferDropAfterUninstall = false;
3673        mUninstallSuccessful = success;
3674        if (mDeferredAction != null) {
3675            mDeferredAction.run();
3676        }
3677    }
3678
3679    @Override
3680    public float getIntrinsicIconScaleFactor() {
3681        return 1f;
3682    }
3683
3684    @Override
3685    public boolean supportsAppInfoDropTarget() {
3686        return true;
3687    }
3688
3689    @Override
3690    public boolean supportsDeleteDropTarget() {
3691        return true;
3692    }
3693
3694    public boolean isDropEnabled() {
3695        return true;
3696    }
3697
3698    @Override
3699    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
3700        // We don't dispatch restoreInstanceState to our children using this code path.
3701        // Some pages will be restored immediately as their items are bound immediately, and
3702        // others we will need to wait until after their items are bound.
3703        mSavedStates = container;
3704    }
3705
3706    public void restoreInstanceStateForChild(int child) {
3707        if (mSavedStates != null) {
3708            mRestoredPages.add(child);
3709            CellLayout cl = (CellLayout) getChildAt(child);
3710            if (cl != null) {
3711                cl.restoreInstanceState(mSavedStates);
3712            }
3713        }
3714    }
3715
3716    public void restoreInstanceStateForRemainingPages() {
3717        int count = getChildCount();
3718        for (int i = 0; i < count; i++) {
3719            if (!mRestoredPages.contains(i)) {
3720                restoreInstanceStateForChild(i);
3721            }
3722        }
3723        mRestoredPages.clear();
3724        mSavedStates = null;
3725    }
3726
3727    @Override
3728    public void scrollLeft() {
3729        if (!workspaceInModalState() && !mIsSwitchingState) {
3730            super.scrollLeft();
3731        }
3732        Folder openFolder = Folder.getOpen(mLauncher);
3733        if (openFolder != null) {
3734            openFolder.completeDragExit();
3735        }
3736    }
3737
3738    @Override
3739    public void scrollRight() {
3740        if (!workspaceInModalState() && !mIsSwitchingState) {
3741            super.scrollRight();
3742        }
3743        Folder openFolder = Folder.getOpen(mLauncher);
3744        if (openFolder != null) {
3745            openFolder.completeDragExit();
3746        }
3747    }
3748
3749    /**
3750     * Returns a specific CellLayout
3751     */
3752    CellLayout getParentCellLayoutForView(View v) {
3753        ArrayList<CellLayout> layouts = getWorkspaceAndHotseatCellLayouts();
3754        for (CellLayout layout : layouts) {
3755            if (layout.getShortcutsAndWidgets().indexOfChild(v) > -1) {
3756                return layout;
3757            }
3758        }
3759        return null;
3760    }
3761
3762    /**
3763     * Returns a list of all the CellLayouts in the workspace.
3764     */
3765    ArrayList<CellLayout> getWorkspaceAndHotseatCellLayouts() {
3766        ArrayList<CellLayout> layouts = new ArrayList<CellLayout>();
3767        int screenCount = getChildCount();
3768        for (int screen = 0; screen < screenCount; screen++) {
3769            layouts.add(((CellLayout) getChildAt(screen)));
3770        }
3771        if (mLauncher.getHotseat() != null) {
3772            layouts.add(mLauncher.getHotseat().getLayout());
3773        }
3774        return layouts;
3775    }
3776
3777    /**
3778     * We should only use this to search for specific children.  Do not use this method to modify
3779     * ShortcutsAndWidgetsContainer directly. Includes ShortcutAndWidgetContainers from
3780     * the hotseat and workspace pages
3781     */
3782    ArrayList<ShortcutAndWidgetContainer> getAllShortcutAndWidgetContainers() {
3783        ArrayList<ShortcutAndWidgetContainer> childrenLayouts = new ArrayList<>();
3784        int screenCount = getChildCount();
3785        for (int screen = 0; screen < screenCount; screen++) {
3786            childrenLayouts.add(((CellLayout) getChildAt(screen)).getShortcutsAndWidgets());
3787        }
3788        if (mLauncher.getHotseat() != null) {
3789            childrenLayouts.add(mLauncher.getHotseat().getLayout().getShortcutsAndWidgets());
3790        }
3791        return childrenLayouts;
3792    }
3793
3794    public View getHomescreenIconByItemId(final long id) {
3795        return getFirstMatch(new ItemOperator() {
3796
3797            @Override
3798            public boolean evaluate(ItemInfo info, View v) {
3799                return info != null && info.id == id;
3800            }
3801        });
3802    }
3803
3804    public View getViewForTag(final Object tag) {
3805        return getFirstMatch(new ItemOperator() {
3806
3807            @Override
3808            public boolean evaluate(ItemInfo info, View v) {
3809                return info == tag;
3810            }
3811        });
3812    }
3813
3814    public LauncherAppWidgetHostView getWidgetForAppWidgetId(final int appWidgetId) {
3815        return (LauncherAppWidgetHostView) getFirstMatch(new ItemOperator() {
3816
3817            @Override
3818            public boolean evaluate(ItemInfo info, View v) {
3819                return (info instanceof LauncherAppWidgetInfo) &&
3820                        ((LauncherAppWidgetInfo) info).appWidgetId == appWidgetId;
3821            }
3822        });
3823    }
3824
3825    public View getFirstMatch(final ItemOperator operator) {
3826        final View[] value = new View[1];
3827        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3828            @Override
3829            public boolean evaluate(ItemInfo info, View v) {
3830                if (operator.evaluate(info, v)) {
3831                    value[0] = v;
3832                    return true;
3833                }
3834                return false;
3835            }
3836        });
3837        return value[0];
3838    }
3839
3840    void clearDropTargets() {
3841        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3842            @Override
3843            public boolean evaluate(ItemInfo info, View v) {
3844                if (v instanceof DropTarget) {
3845                    mDragController.removeDropTarget((DropTarget) v);
3846                }
3847                // not done, process all the shortcuts
3848                return false;
3849            }
3850        });
3851    }
3852
3853    /**
3854     * Removes items that match the {@param matcher}. When applications are removed
3855     * as a part of an update, this is called to ensure that other widgets and application
3856     * shortcuts are not removed.
3857     */
3858    public void removeItemsByMatcher(final ItemInfoMatcher matcher) {
3859        ArrayList<CellLayout> cellLayouts = getWorkspaceAndHotseatCellLayouts();
3860        for (final CellLayout layoutParent: cellLayouts) {
3861            final ViewGroup layout = layoutParent.getShortcutsAndWidgets();
3862
3863            LongArrayMap<View> idToViewMap = new LongArrayMap<>();
3864            ArrayList<ItemInfo> items = new ArrayList<>();
3865            for (int j = 0; j < layout.getChildCount(); j++) {
3866                final View view = layout.getChildAt(j);
3867                if (view.getTag() instanceof ItemInfo) {
3868                    ItemInfo item = (ItemInfo) view.getTag();
3869                    items.add(item);
3870                    idToViewMap.put(item.id, view);
3871                }
3872            }
3873
3874            for (ItemInfo itemToRemove : matcher.filterItemInfos(items)) {
3875                View child = idToViewMap.get(itemToRemove.id);
3876
3877                if (child != null) {
3878                    // Note: We can not remove the view directly from CellLayoutChildren as this
3879                    // does not re-mark the spaces as unoccupied.
3880                    layoutParent.removeViewInLayout(child);
3881                    if (child instanceof DropTarget) {
3882                        mDragController.removeDropTarget((DropTarget) child);
3883                    }
3884                } else if (itemToRemove.container >= 0) {
3885                    // The item may belong to a folder.
3886                    View parent = idToViewMap.get(itemToRemove.container);
3887                    if (parent != null) {
3888                        FolderInfo folderInfo = (FolderInfo) parent.getTag();
3889                        folderInfo.prepareAutoUpdate();
3890                        folderInfo.remove((ShortcutInfo) itemToRemove, false);
3891                    }
3892                }
3893            }
3894        }
3895
3896        // Strip all the empty screens
3897        stripEmptyScreens();
3898    }
3899
3900    public interface ItemOperator {
3901        /**
3902         * Process the next itemInfo, possibly with side-effect on the next item.
3903         *
3904         * @param info info for the shortcut
3905         * @param view view for the shortcut
3906         * @return true if done, false to continue the map
3907         */
3908        public boolean evaluate(ItemInfo info, View view);
3909    }
3910
3911    /**
3912     * Map the operator over the shortcuts and widgets, return the first-non-null value.
3913     *
3914     * @param recurse true: iterate over folder children. false: op get the folders themselves.
3915     * @param op the operator to map over the shortcuts
3916     */
3917    void mapOverItems(boolean recurse, ItemOperator op) {
3918        ArrayList<ShortcutAndWidgetContainer> containers = getAllShortcutAndWidgetContainers();
3919        final int containerCount = containers.size();
3920        for (int containerIdx = 0; containerIdx < containerCount; containerIdx++) {
3921            ShortcutAndWidgetContainer container = containers.get(containerIdx);
3922            // map over all the shortcuts on the workspace
3923            final int itemCount = container.getChildCount();
3924            for (int itemIdx = 0; itemIdx < itemCount; itemIdx++) {
3925                View item = container.getChildAt(itemIdx);
3926                ItemInfo info = (ItemInfo) item.getTag();
3927                if (recurse && info instanceof FolderInfo && item instanceof FolderIcon) {
3928                    FolderIcon folder = (FolderIcon) item;
3929                    ArrayList<View> folderChildren = folder.getFolder().getItemsInReadingOrder();
3930                    // map over all the children in the folder
3931                    final int childCount = folderChildren.size();
3932                    for (int childIdx = 0; childIdx < childCount; childIdx++) {
3933                        View child = folderChildren.get(childIdx);
3934                        info = (ItemInfo) child.getTag();
3935                        if (op.evaluate(info, child)) {
3936                            return;
3937                        }
3938                    }
3939                } else {
3940                    if (op.evaluate(info, item)) {
3941                        return;
3942                    }
3943                }
3944            }
3945        }
3946    }
3947
3948    void updateShortcuts(ArrayList<ShortcutInfo> shortcuts) {
3949        int total  = shortcuts.size();
3950        final HashSet<ShortcutInfo> updates = new HashSet<ShortcutInfo>(total);
3951        final HashSet<Long> folderIds = new HashSet<>();
3952
3953        for (int i = 0; i < total; i++) {
3954            ShortcutInfo s = shortcuts.get(i);
3955            updates.add(s);
3956            folderIds.add(s.container);
3957        }
3958
3959        mapOverItems(MAP_RECURSE, new ItemOperator() {
3960            @Override
3961            public boolean evaluate(ItemInfo info, View v) {
3962                if (info instanceof ShortcutInfo && v instanceof BubbleTextView &&
3963                        updates.contains(info)) {
3964                    ShortcutInfo si = (ShortcutInfo) info;
3965                    BubbleTextView shortcut = (BubbleTextView) v;
3966                    Drawable oldIcon = getTextViewIcon(shortcut);
3967                    boolean oldPromiseState = (oldIcon instanceof PreloadIconDrawable)
3968                            && ((PreloadIconDrawable) oldIcon).hasNotCompleted();
3969                    shortcut.applyFromShortcutInfo(si, si.isPromise() != oldPromiseState);
3970                }
3971                // process all the shortcuts
3972                return false;
3973            }
3974        });
3975
3976        // Update folder icons
3977        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
3978            @Override
3979            public boolean evaluate(ItemInfo info, View v) {
3980                if (info instanceof FolderInfo && folderIds.contains(info.id)) {
3981                    ((FolderInfo) info).itemsChanged(false);
3982                }
3983                // process all the shortcuts
3984                return false;
3985            }
3986        });
3987    }
3988
3989    public void updateIconBadges(final Set<PackageUserKey> updatedBadges) {
3990        final PackageUserKey packageUserKey = new PackageUserKey(null, null);
3991        final HashSet<Long> folderIds = new HashSet<>();
3992        mapOverItems(MAP_RECURSE, new ItemOperator() {
3993            @Override
3994            public boolean evaluate(ItemInfo info, View v) {
3995                if (info instanceof ShortcutInfo && v instanceof BubbleTextView
3996                        && packageUserKey.updateFromItemInfo(info)) {
3997                    if (updatedBadges.contains(packageUserKey)) {
3998                        ((BubbleTextView) v).applyBadgeState(info, true /* animate */);
3999                        folderIds.add(info.container);
4000                    }
4001                }
4002                // process all the shortcuts
4003                return false;
4004            }
4005        });
4006
4007        // Update folder icons
4008        mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4009            @Override
4010            public boolean evaluate(ItemInfo info, View v) {
4011                if (info instanceof FolderInfo && folderIds.contains(info.id)
4012                        && v instanceof FolderIcon) {
4013                    FolderBadgeInfo folderBadgeInfo = new FolderBadgeInfo();
4014                    for (ShortcutInfo si : ((FolderInfo) info).contents) {
4015                        folderBadgeInfo.addBadgeInfo(mLauncher.getPopupDataProvider()
4016                                .getBadgeInfoForItem(si));
4017                    }
4018                    ((FolderIcon) v).setBadgeInfo(folderBadgeInfo);
4019                }
4020                // process all the shortcuts
4021                return false;
4022            }
4023        });
4024    }
4025
4026    public void removeAbandonedPromise(String packageName, UserHandle user) {
4027        HashSet<String> packages = new HashSet<>(1);
4028        packages.add(packageName);
4029        ItemInfoMatcher matcher = ItemInfoMatcher.ofPackages(packages, user);
4030        mLauncher.getModelWriter().deleteItemsFromDatabase(matcher);
4031        removeItemsByMatcher(matcher);
4032    }
4033
4034    public void updateRestoreItems(final HashSet<ItemInfo> updates) {
4035        mapOverItems(MAP_RECURSE, new ItemOperator() {
4036            @Override
4037            public boolean evaluate(ItemInfo info, View v) {
4038                if (info instanceof ShortcutInfo && v instanceof BubbleTextView
4039                        && updates.contains(info)) {
4040                    ((BubbleTextView) v).applyPromiseState(false /* promiseStateChanged */);
4041                } else if (v instanceof PendingAppWidgetHostView
4042                        && info instanceof LauncherAppWidgetInfo
4043                        && updates.contains(info)) {
4044                    ((PendingAppWidgetHostView) v).applyState();
4045                }
4046                // process all the shortcuts
4047                return false;
4048            }
4049        });
4050    }
4051
4052    public void widgetsRestored(final ArrayList<LauncherAppWidgetInfo> changedInfo) {
4053        if (!changedInfo.isEmpty()) {
4054            DeferredWidgetRefresh widgetRefresh = new DeferredWidgetRefresh(changedInfo,
4055                    mLauncher.getAppWidgetHost());
4056
4057            LauncherAppWidgetInfo item = changedInfo.get(0);
4058            final AppWidgetProviderInfo widgetInfo;
4059            if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_NOT_VALID)) {
4060                widgetInfo = AppWidgetManagerCompat
4061                        .getInstance(mLauncher).findProvider(item.providerName, item.user);
4062            } else {
4063                widgetInfo = AppWidgetManagerCompat.getInstance(mLauncher)
4064                        .getAppWidgetInfo(item.appWidgetId);
4065            }
4066
4067            if (widgetInfo != null) {
4068                // Re-inflate the widgets which have changed status
4069                widgetRefresh.run();
4070            } else {
4071                // widgetRefresh will automatically run when the packages are updated.
4072                // For now just update the progress bars
4073                mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4074                    @Override
4075                    public boolean evaluate(ItemInfo info, View view) {
4076                        if (view instanceof PendingAppWidgetHostView
4077                                && changedInfo.contains(info)) {
4078                            ((LauncherAppWidgetInfo) info).installProgress = 100;
4079                            ((PendingAppWidgetHostView) view).applyState();
4080                        }
4081                        // process all the shortcuts
4082                        return false;
4083                    }
4084                });
4085            }
4086        }
4087    }
4088
4089    private void moveToScreen(int page, boolean animate) {
4090        if (!workspaceInModalState()) {
4091            if (animate) {
4092                snapToPage(page);
4093            } else {
4094                setCurrentPage(page);
4095            }
4096        }
4097        View child = getChildAt(page);
4098        if (child != null) {
4099            child.requestFocus();
4100        }
4101    }
4102
4103    void moveToDefaultScreen(boolean animate) {
4104        moveToScreen(getDefaultPage(), animate);
4105    }
4106
4107    void moveToCustomContentScreen(boolean animate) {
4108        if (hasCustomContent()) {
4109            int ccIndex = getPageIndexForScreenId(CUSTOM_CONTENT_SCREEN_ID);
4110            if (animate) {
4111                snapToPage(ccIndex);
4112            } else {
4113                setCurrentPage(ccIndex);
4114            }
4115            View child = getChildAt(ccIndex);
4116            if (child != null) {
4117                child.requestFocus();
4118            }
4119         }
4120        exitWidgetResizeMode();
4121    }
4122
4123    @Override
4124    protected String getPageIndicatorDescription() {
4125        return getResources().getString(R.string.all_apps_button_label);
4126    }
4127
4128    @Override
4129    protected String getCurrentPageDescription() {
4130        if (hasCustomContent() && getNextPage() == 0) {
4131            return mCustomContentDescription;
4132        }
4133        int page = (mNextPage != INVALID_PAGE) ? mNextPage : mCurrentPage;
4134        return getPageDescription(page);
4135    }
4136
4137    private String getPageDescription(int page) {
4138        int delta = numCustomPages();
4139        int nScreens = getChildCount() - delta;
4140        int extraScreenId = mScreenOrder.indexOf(EXTRA_EMPTY_SCREEN_ID);
4141        if (extraScreenId >= 0 && nScreens > 1) {
4142            if (page == extraScreenId) {
4143                return getContext().getString(R.string.workspace_new_page);
4144            }
4145            nScreens--;
4146        }
4147        if (nScreens == 0) {
4148            // When the workspace is not loaded, we do not know how many screen will be bound.
4149            return getContext().getString(R.string.all_apps_home_button_label);
4150        }
4151        return getContext().getString(R.string.workspace_scroll_format,
4152                page + 1 - delta, nScreens);
4153    }
4154
4155    @Override
4156    public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
4157        target.gridX = info.cellX;
4158        target.gridY = info.cellY;
4159        target.pageIndex = getCurrentPage();
4160        targetParent.containerType = ContainerType.WORKSPACE;
4161        if (info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
4162            target.rank = info.rank;
4163            targetParent.containerType = ContainerType.HOTSEAT;
4164        } else if (info.container >= 0) {
4165            targetParent.containerType = ContainerType.FOLDER;
4166        }
4167    }
4168
4169    @Override
4170    public boolean enableFreeScroll() {
4171        if (getState() == State.OVERVIEW) {
4172            return super.enableFreeScroll();
4173        } else {
4174            Log.w(TAG, "enableFreeScroll called but not in overview: state=" + getState());
4175            return false;
4176        }
4177    }
4178
4179    /**
4180     * Used as a workaround to ensure that the AppWidgetService receives the
4181     * PACKAGE_ADDED broadcast before updating widgets.
4182     */
4183    private class DeferredWidgetRefresh implements Runnable {
4184        private final ArrayList<LauncherAppWidgetInfo> mInfos;
4185        private final LauncherAppWidgetHost mHost;
4186        private final Handler mHandler;
4187
4188        private boolean mRefreshPending;
4189
4190        public DeferredWidgetRefresh(ArrayList<LauncherAppWidgetInfo> infos,
4191                LauncherAppWidgetHost host) {
4192            mInfos = infos;
4193            mHost = host;
4194            mHandler = new Handler();
4195            mRefreshPending = true;
4196
4197            mHost.addProviderChangeListener(this);
4198            // Force refresh after 10 seconds, if we don't get the provider changed event.
4199            // This could happen when the provider is no longer available in the app.
4200            mHandler.postDelayed(this, 10000);
4201        }
4202
4203        @Override
4204        public void run() {
4205            mHost.removeProviderChangeListener(this);
4206            mHandler.removeCallbacks(this);
4207
4208            if (!mRefreshPending) {
4209                return;
4210            }
4211
4212            mRefreshPending = false;
4213
4214            mapOverItems(MAP_NO_RECURSE, new ItemOperator() {
4215                @Override
4216                public boolean evaluate(ItemInfo info, View view) {
4217                    if (view instanceof PendingAppWidgetHostView && mInfos.contains(info)) {
4218                        mLauncher.removeItem(view, info, false /* deleteFromDb */);
4219                        mLauncher.bindAppWidget((LauncherAppWidgetInfo) info);
4220                    }
4221                    // process all the shortcuts
4222                    return false;
4223                }
4224            });
4225        }
4226    }
4227
4228    public interface OnStateChangeListener {
4229
4230        /**
4231         * Called when the workspace state is changing.
4232         * @param toState final state
4233         * @param targetAnim animation which will be played during the transition or null.
4234         */
4235        void prepareStateChange(State toState, AnimatorSet targetAnim);
4236    }
4237
4238    public static final boolean isQsbContainerPage(int pageNo) {
4239        return pageNo == 0;
4240    }
4241
4242    private class StateTransitionListener extends AnimatorListenerAdapter
4243            implements AnimatorUpdateListener {
4244        @Override
4245        public void onAnimationUpdate(ValueAnimator anim) {
4246            mTransitionProgress = anim.getAnimatedFraction();
4247        }
4248
4249        @Override
4250        public void onAnimationStart(Animator animation) {
4251            if (mState == State.SPRING_LOADED) {
4252                // Show the page indicator at the same time as the rest of the transition.
4253                showPageIndicatorAtCurrentScroll();
4254            }
4255            mTransitionProgress = 0;
4256        }
4257
4258        @Override
4259        public void onAnimationEnd(Animator animation) {
4260            onEndStateTransition();
4261        }
4262    }
4263}
4264