src/com/android/launcher2/Launcher.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher2;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.SearchManager;
import android.app.StatusBarManager;
import android.app.WallpaperManager;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.Intent.ShortcutIconResource;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.ContentObserver;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Parcelable;
import android.os.SystemProperties;
import android.provider.LiveFolders;
import android.text.Selection;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.method.TextKeyListener;
import android.util.Log;
import android.view.Display;
import android.view.HapticFeedbackConstants;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnLongClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ImageView;
import android.widget.PopupWindow;
import android.widget.LinearLayout;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProviderInfo;

import java.util.ArrayList;
import java.util.HashMap;
import java.io.DataOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.DataInputStream;

/**
 * Default launcher application.
 */
public final class Launcher extends Activity
        implements View.OnClickListener, OnLongClickListener, LauncherModel.Callbacks {
    static final String TAG = "Launcher";
    static final boolean LOGD = false;

    static final boolean PROFILE_STARTUP = false;
    static final boolean PROFILE_ROTATE = false;
    static final boolean DEBUG_USER_INTERFACE = false;

    private static final int WALLPAPER_SCREENS_SPAN = 2;

    private static final int MENU_GROUP_ADD = 1;
    private static final int MENU_ADD = Menu.FIRST + 1;
    private static final int MENU_WALLPAPER_SETTINGS = MENU_ADD + 1;
    private static final int MENU_SEARCH = MENU_WALLPAPER_SETTINGS + 1;
    private static final int MENU_NOTIFICATIONS = MENU_SEARCH + 1;
    private static final int MENU_SETTINGS = MENU_NOTIFICATIONS + 1;

    private static final int REQUEST_CREATE_SHORTCUT = 1;
    private static final int REQUEST_CREATE_LIVE_FOLDER = 4;
    private static final int REQUEST_CREATE_APPWIDGET = 5;
    private static final int REQUEST_PICK_APPLICATION = 6;
    private static final int REQUEST_PICK_SHORTCUT = 7;
    private static final int REQUEST_PICK_LIVE_FOLDER = 8;
    private static final int REQUEST_PICK_APPWIDGET = 9;
    private static final int REQUEST_PICK_WALLPAPER = 10;

    static final String EXTRA_SHORTCUT_DUPLICATE = "duplicate";

    static final int SCREEN_COUNT = 5;
    static final int DEFAULT_SCREEN = 2;
    static final int NUMBER_CELLS_X = 4;
    static final int NUMBER_CELLS_Y = 4;

    static final int DIALOG_CREATE_SHORTCUT = 1;
    static final int DIALOG_RENAME_FOLDER = 2;

    private static final String PREFERENCES = "launcher.preferences";

    // Type: int
    private static final String RUNTIME_STATE_CURRENT_SCREEN = "launcher.current_screen";
    // Type: boolean
    private static final String RUNTIME_STATE_ALL_APPS_FOLDER = "launcher.all_apps_folder";
    // Type: long
    private static final String RUNTIME_STATE_USER_FOLDERS = "launcher.user_folder";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_SCREEN = "launcher.add_screen";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_CELL_X = "launcher.add_cellX";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_CELL_Y = "launcher.add_cellY";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_SPAN_X = "launcher.add_spanX";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_SPAN_Y = "launcher.add_spanY";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_COUNT_X = "launcher.add_countX";
    // Type: int
    private static final String RUNTIME_STATE_PENDING_ADD_COUNT_Y = "launcher.add_countY";
    // Type: int[]
    private static final String RUNTIME_STATE_PENDING_ADD_OCCUPIED_CELLS = "launcher.add_occupied_cells";
    // Type: boolean
    private static final String RUNTIME_STATE_PENDING_FOLDER_RENAME = "launcher.rename_folder";
    // Type: long
    private static final String RUNTIME_STATE_PENDING_FOLDER_RENAME_ID = "launcher.rename_folder_id";

    static final int APPWIDGET_HOST_ID = 1024;

    private static final Object sLock = new Object();
    private static int sScreen = DEFAULT_SCREEN;

    private final BroadcastReceiver mCloseSystemDialogsReceiver
            = new CloseSystemDialogsIntentReceiver();
    private final ContentObserver mWidgetObserver = new AppWidgetResetObserver();

    private LayoutInflater mInflater;

    private DragController mDragController;
    private Workspace mWorkspace;

    private AppWidgetManager mAppWidgetManager;
    private LauncherAppWidgetHost mAppWidgetHost;

    private CellLayout.CellInfo mAddItemCellInfo;
    private CellLayout.CellInfo mMenuAddInfo;
    private final int[] mCellCoordinates = new int[2];
    private FolderInfo mFolderInfo;

    private DeleteZone mDeleteZone;
    private HandleView mHandleView;
    private AllAppsView mAllAppsGrid;

    private Bundle mSavedState;

    private SpannableStringBuilder mDefaultKeySsb = null;

    private boolean mWorkspaceLoading = true;

    private boolean mPaused = true;
    private boolean mRestoring;
    private boolean mWaitingForResult;

    private Bundle mSavedInstanceState;

    private LauncherModel mModel;

    private ArrayList<ItemInfo> mDesktopItems = new ArrayList<ItemInfo>();
    private static HashMap<Long, FolderInfo> mFolders = new HashMap<Long, FolderInfo>();

    private ImageView mPreviousView;
    private ImageView mNextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mModel = ((LauncherApplication)getApplication()).setLauncher(this);
        mDragController = new DragController(this);
        mInflater = getLayoutInflater();

        mAppWidgetManager = AppWidgetManager.getInstance(this);
        mAppWidgetHost = new LauncherAppWidgetHost(this, APPWIDGET_HOST_ID);
        mAppWidgetHost.startListening();

        if (PROFILE_STARTUP) {
            android.os.Debug.startMethodTracing("/sdcard/launcher");
        }

        checkForLocaleChange();
        setWallpaperDimension();

        setContentView(R.layout.launcher);
        setupViews();

        registerContentObservers();

        lockAllApps();

        mSavedState = savedInstanceState;
        restoreState(mSavedState);

        if (PROFILE_STARTUP) {
            android.os.Debug.stopMethodTracing();
        }

        // We have a new AllAppsView, we need to re-bind everything, and it could have
        // changed in our absence.
        mModel.setAllAppsDirty();
        mModel.setWorkspaceDirty();

        if (!mRestoring) {
            mModel.startLoader(this, true);
        }

        // For handling default keys
        mDefaultKeySsb = new SpannableStringBuilder();
        Selection.setSelection(mDefaultKeySsb, 0);

        IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        registerReceiver(mCloseSystemDialogsReceiver, filter);
    }

    private void checkForLocaleChange() {
        final LocaleConfiguration localeConfiguration = new LocaleConfiguration();
        readConfiguration(this, localeConfiguration);

        final Configuration configuration = getResources().getConfiguration();

        final String previousLocale = localeConfiguration.locale;
        final String locale = configuration.locale.toString();

        final int previousMcc = localeConfiguration.mcc;
        final int mcc = configuration.mcc;

        final int previousMnc = localeConfiguration.mnc;
        final int mnc = configuration.mnc;

        boolean localeChanged = !locale.equals(previousLocale) || mcc != previousMcc || mnc != previousMnc;

        if (localeChanged) {
            localeConfiguration.locale = locale;
            localeConfiguration.mcc = mcc;
            localeConfiguration.mnc = mnc;

            writeConfiguration(this, localeConfiguration);
            AppInfoCache.flush();
        }
    }

    private static class LocaleConfiguration {
        public String locale;
        public int mcc = -1;
        public int mnc = -1;
    }

    private static void readConfiguration(Context context, LocaleConfiguration configuration) {
        DataInputStream in = null;
        try {
            in = new DataInputStream(context.openFileInput(PREFERENCES));
            configuration.locale = in.readUTF();
            configuration.mcc = in.readInt();
            configuration.mnc = in.readInt();
        } catch (FileNotFoundException e) {
            // Ignore
        } catch (IOException e) {
            // Ignore
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // Ignore
                }
            }
        }
    }

    private static void writeConfiguration(Context context, LocaleConfiguration configuration) {
        DataOutputStream out = null;
        try {
            out = new DataOutputStream(context.openFileOutput(PREFERENCES, MODE_PRIVATE));
            out.writeUTF(configuration.locale);
            out.writeInt(configuration.mcc);
            out.writeInt(configuration.mnc);
            out.flush();
        } catch (FileNotFoundException e) {
            // Ignore
        } catch (IOException e) {
            //noinspection ResultOfMethodCallIgnored
            context.getFileStreamPath(PREFERENCES).delete();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // Ignore
                }
            }
        }
    }

    static int getScreen() {
        synchronized (sLock) {
            return sScreen;
        }
    }

    static void setScreen(int screen) {
        synchronized (sLock) {
            sScreen = screen;
        }
    }

    private void setWallpaperDimension() {
        WallpaperManager wpm = (WallpaperManager)getSystemService(WALLPAPER_SERVICE);

        Display display = getWindowManager().getDefaultDisplay();
        boolean isPortrait = display.getWidth() < display.getHeight();

        final int width = isPortrait ? display.getWidth() : display.getHeight();
        final int height = isPortrait ? display.getHeight() : display.getWidth();
        wpm.suggestDesiredDimensions(width * WALLPAPER_SCREENS_SPAN, height);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        mWaitingForResult = false;

        // The pattern used here is that a user PICKs a specific application,
        // which, depending on the target, might need to CREATE the actual target.

        // For example, the user would PICK_SHORTCUT for "Music playlist", and we
        // launch over to the Music app to actually CREATE_SHORTCUT.

        if (resultCode == RESULT_OK && mAddItemCellInfo != null) {
            switch (requestCode) {
                case REQUEST_PICK_APPLICATION:
                    completeAddApplication(this, data, mAddItemCellInfo);
                    break;
                case REQUEST_PICK_SHORTCUT:
                    processShortcut(data, REQUEST_PICK_APPLICATION, REQUEST_CREATE_SHORTCUT);
                    break;
                case REQUEST_CREATE_SHORTCUT:
                    completeAddShortcut(data, mAddItemCellInfo);
                    break;
                case REQUEST_PICK_LIVE_FOLDER:
                    addLiveFolder(data);
                    break;
                case REQUEST_CREATE_LIVE_FOLDER:
                    completeAddLiveFolder(data, mAddItemCellInfo);
                    break;
                case REQUEST_PICK_APPWIDGET:
                    addAppWidget(data);
                    break;
                case REQUEST_CREATE_APPWIDGET:
                    completeAddAppWidget(data, mAddItemCellInfo);
                    break;
                case REQUEST_PICK_WALLPAPER:
                    // We just wanted the activity result here so we can clear mWaitingForResult
                    break;
            }
        } else if ((requestCode == REQUEST_PICK_APPWIDGET ||
                requestCode == REQUEST_CREATE_APPWIDGET) && resultCode == RESULT_CANCELED &&
                data != null) {
            // Clean up the appWidgetId if we canceled
            int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
            if (appWidgetId != -1) {
                mAppWidgetHost.deleteAppWidgetId(appWidgetId);
            }
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        mPaused = false;

        if (mRestoring) {
            mWorkspaceLoading = true;
            mModel.startLoader(this, true);
            mRestoring = false;
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        dismissPreview(mPreviousView);
        dismissPreview(mNextView);
        mDragController.cancelDrag();
    }

    @Override
    public Object onRetainNonConfigurationInstance() {
        // Flag the loader to stop early before switching
        mModel.stopLoader();

        if (PROFILE_ROTATE) {
            android.os.Debug.startMethodTracing("/sdcard/launcher-rotate");
        }
        return null;
    }

    private boolean acceptFilter() {
        final InputMethodManager inputManager = (InputMethodManager)
                getSystemService(Context.INPUT_METHOD_SERVICE);
        return !inputManager.isFullscreenMode();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        boolean handled = super.onKeyDown(keyCode, event);
        if (!handled && acceptFilter() && keyCode != KeyEvent.KEYCODE_ENTER) {
            boolean gotKey = TextKeyListener.getInstance().onKeyDown(mWorkspace, mDefaultKeySsb,
                    keyCode, event);
            if (gotKey && mDefaultKeySsb != null && mDefaultKeySsb.length() > 0) {
                // something usable has been typed - start a search
                // the typed text will be retrieved and cleared by
                // showSearchDialog()
                // If there are multiple keystrokes before the search dialog takes focus,
                // onSearchRequested() will be called for every keystroke,
                // but it is idempotent, so it's fine.
                return onSearchRequested();
            }
        }

        return handled;
    }

    private String getTypedText() {
        return mDefaultKeySsb.toString();
    }

    private void clearTypedText() {
        mDefaultKeySsb.clear();
        mDefaultKeySsb.clearSpans();
        Selection.setSelection(mDefaultKeySsb, 0);
    }

    /**
     * Restores the previous state, if it exists.
     *
     * @param savedState The previous state.
     */
    private void restoreState(Bundle savedState) {
        if (savedState == null) {
            return;
        }

        final boolean allApps = savedState.getBoolean(RUNTIME_STATE_ALL_APPS_FOLDER, false);
        if (allApps) {
            showAllApps(false);
        }

        final int currentScreen = savedState.getInt(RUNTIME_STATE_CURRENT_SCREEN, -1);
        if (currentScreen > -1) {
            mWorkspace.setCurrentScreen(currentScreen);
        }

        final int addScreen = savedState.getInt(RUNTIME_STATE_PENDING_ADD_SCREEN, -1);
        if (addScreen > -1) {
            mAddItemCellInfo = new CellLayout.CellInfo();
            final CellLayout.CellInfo addItemCellInfo = mAddItemCellInfo;
            addItemCellInfo.valid = true;
            addItemCellInfo.screen = addScreen;
            addItemCellInfo.cellX = savedState.getInt(RUNTIME_STATE_PENDING_ADD_CELL_X);
            addItemCellInfo.cellY = savedState.getInt(RUNTIME_STATE_PENDING_ADD_CELL_Y);
            addItemCellInfo.spanX = savedState.getInt(RUNTIME_STATE_PENDING_ADD_SPAN_X);
            addItemCellInfo.spanY = savedState.getInt(RUNTIME_STATE_PENDING_ADD_SPAN_Y);
            addItemCellInfo.findVacantCellsFromOccupied(
                    savedState.getBooleanArray(RUNTIME_STATE_PENDING_ADD_OCCUPIED_CELLS),
                    savedState.getInt(RUNTIME_STATE_PENDING_ADD_COUNT_X),
                    savedState.getInt(RUNTIME_STATE_PENDING_ADD_COUNT_Y));
            mRestoring = true;
        }

        boolean renameFolder = savedState.getBoolean(RUNTIME_STATE_PENDING_FOLDER_RENAME, false);
        if (renameFolder) {
            long id = savedState.getLong(RUNTIME_STATE_PENDING_FOLDER_RENAME_ID);
            mFolderInfo = mModel.getFolderById(this, mFolders, id);
            mRestoring = true;
        }
    }

    /**
     * Finds all the views we need and configure them properly.
     */
    private void setupViews() {
        DragController dragController = mDragController;

        DragLayer dragLayer = (DragLayer) findViewById(R.id.drag_layer);
        dragLayer.setDragController(dragController);

        mAllAppsGrid = (AllAppsView)dragLayer.findViewById(R.id.all_apps_view);
        mAllAppsGrid.setLauncher(this);
        mAllAppsGrid.setDragController(dragController);
        mAllAppsGrid.setWillNotDraw(false); // We don't want a hole punched in our window.
        // Manage focusability manually since this thing is always visible
        mAllAppsGrid.setFocusable(false); 

        mWorkspace = (Workspace) dragLayer.findViewById(R.id.workspace);
        final Workspace workspace = mWorkspace;

        DeleteZone deleteZone = (DeleteZone) dragLayer.findViewById(R.id.delete_zone);
        mDeleteZone = deleteZone;

        mHandleView = (HandleView) findViewById(R.id.all_apps_button);
        mHandleView.setLauncher(this);
        mHandleView.setOnClickListener(this);
        mHandleView.setOnLongClickListener(this);

        mPreviousView = (ImageView) dragLayer.findViewById(R.id.previous_screen);
        mNextView = (ImageView) dragLayer.findViewById(R.id.next_screen);

        Drawable previous = mPreviousView.getDrawable();
        Drawable next = mNextView.getDrawable();
        mWorkspace.setIndicators(previous, next);

        mPreviousView.setHapticFeedbackEnabled(false);
        mPreviousView.setOnLongClickListener(this);
        mNextView.setHapticFeedbackEnabled(false);
        mNextView.setOnLongClickListener(this);

        workspace.setOnLongClickListener(this);
        workspace.setDragController(dragController);
        workspace.setLauncher(this);

        deleteZone.setLauncher(this);
        deleteZone.setDragController(dragController);
        deleteZone.setHandle(mHandleView);

        dragController.setDragScoller(workspace);
        dragController.setDragListener(deleteZone);
        dragController.setScrollView(dragLayer);
        dragController.setMoveTarget(workspace);

        // The order here is bottom to top.
        dragController.addDropTarget(workspace);
        dragController.addDropTarget(deleteZone);
    }

    @SuppressWarnings({"UnusedDeclaration"})
    public void previousScreen(View v) {
        if (!isAllAppsVisible()) {
            mWorkspace.scrollLeft();
        }
    }

    @SuppressWarnings({"UnusedDeclaration"})
    public void nextScreen(View v) {
        if (!isAllAppsVisible()) {
            mWorkspace.scrollRight();
        }
    }
    
    /**
     * Creates a view representing a shortcut.
     *
     * @param info The data structure describing the shortcut.
     *
     * @return A View inflated from R.layout.application.
     */
    View createShortcut(ApplicationInfo info) {
        return createShortcut(R.layout.application,
                (ViewGroup) mWorkspace.getChildAt(mWorkspace.getCurrentScreen()), info);
    }

    /**
     * Creates a view representing a shortcut inflated from the specified resource.
     *
     * @param layoutResId The id of the XML layout used to create the shortcut.
     * @param parent The group the shortcut belongs to.
     * @param info The data structure describing the shortcut.
     *
     * @return A View inflated from layoutResId.
     */
    View createShortcut(int layoutResId, ViewGroup parent, ApplicationInfo info) {
        TextView favorite = (TextView) mInflater.inflate(layoutResId, parent, false);

        if (info.icon == null) {
            info.icon = AppInfoCache.getIconDrawable(getPackageManager(), info);
        }
        if (!info.filtered) {
            info.icon = Utilities.createIconThumbnail(info.icon, this);
            info.filtered = true;
        }

        favorite.setCompoundDrawablesWithIntrinsicBounds(null, info.icon, null, null);
        favorite.setText(info.title);
        favorite.setTag(info);
        favorite.setOnClickListener(this);

        return favorite;
    }

    /**
     * Add an application shortcut to the workspace.
     *
     * @param data The intent describing the application.
     * @param cellInfo The position on screen where to create the shortcut.
     */
    void completeAddApplication(Context context, Intent data, CellLayout.CellInfo cellInfo) {
        cellInfo.screen = mWorkspace.getCurrentScreen();
        if (!findSingleSlot(cellInfo)) return;

        final ApplicationInfo info = infoFromApplicationIntent(context, data);
        if (info != null) {
            mWorkspace.addApplicationShortcut(info, cellInfo, isWorkspaceLocked());
        }
    }

    private static ApplicationInfo infoFromApplicationIntent(Context context, Intent data) {
        ComponentName component = data.getComponent();
        PackageManager packageManager = context.getPackageManager();
        ActivityInfo activityInfo = null;
        try {
            activityInfo = packageManager.getActivityInfo(component, 0 /* no flags */);
        } catch (NameNotFoundException e) {
            Log.e(TAG, "Couldn't find ActivityInfo for selected application", e);
        }

        if (activityInfo != null) {
            ApplicationInfo itemInfo = new ApplicationInfo();

            itemInfo.title = activityInfo.loadLabel(packageManager);
            if (itemInfo.title == null) {
                itemInfo.title = activityInfo.name;
            }

            itemInfo.setActivity(component, Intent.FLAG_ACTIVITY_NEW_TASK |
                    Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
            itemInfo.icon = activityInfo.loadIcon(packageManager);
            itemInfo.container = ItemInfo.NO_ID;

            return itemInfo;
        }

        return null;
    }

    /**
     * Add a shortcut to the workspace.
     *
     * @param data The intent describing the shortcut.
     * @param cellInfo The position on screen where to create the shortcut.
     */
    private void completeAddShortcut(Intent data, CellLayout.CellInfo cellInfo) {
        cellInfo.screen = mWorkspace.getCurrentScreen();
        if (!findSingleSlot(cellInfo)) return;

        final ApplicationInfo info = addShortcut(this, data, cellInfo, false);

        if (!mRestoring) {
            final View view = createShortcut(info);
            mWorkspace.addInCurrentScreen(view, cellInfo.cellX, cellInfo.cellY, 1, 1,
                    isWorkspaceLocked());
        }
    }


    /**
     * Add a widget to the workspace.
     *
     * @param data The intent describing the appWidgetId.
     * @param cellInfo The position on screen where to create the widget.
     */
    private void completeAddAppWidget(Intent data, CellLayout.CellInfo cellInfo) {
        Bundle extras = data.getExtras();
        int appWidgetId = extras.getInt(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);

        if (LOGD) Log.d(TAG, "dumping extras content=" + extras.toString());

        AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);

        // Calculate the grid spans needed to fit this widget
        CellLayout layout = (CellLayout) mWorkspace.getChildAt(cellInfo.screen);
        int[] spans = layout.rectToCell(appWidgetInfo.minWidth, appWidgetInfo.minHeight);

        // Try finding open space on Launcher screen
        final int[] xy = mCellCoordinates;
        if (!findSlot(cellInfo, xy, spans[0], spans[1])) {
            if (appWidgetId != -1) mAppWidgetHost.deleteAppWidgetId(appWidgetId);
            return;
        }

        // Build Launcher-specific widget info and save to database
        LauncherAppWidgetInfo launcherInfo = new LauncherAppWidgetInfo(appWidgetId);
        launcherInfo.spanX = spans[0];
        launcherInfo.spanY = spans[1];

        LauncherModel.addItemToDatabase(this, launcherInfo,
                LauncherSettings.Favorites.CONTAINER_DESKTOP,
                mWorkspace.getCurrentScreen(), xy[0], xy[1], false);

        if (!mRestoring) {
            mDesktopItems.add(launcherInfo);

            // Perform actual inflation because we're live
            launcherInfo.hostView = mAppWidgetHost.createView(this, appWidgetId, appWidgetInfo);

            launcherInfo.hostView.setAppWidget(appWidgetId, appWidgetInfo);
            launcherInfo.hostView.setTag(launcherInfo);

            mWorkspace.addInCurrentScreen(launcherInfo.hostView, xy[0], xy[1],
                    launcherInfo.spanX, launcherInfo.spanY, isWorkspaceLocked());
        }
    }

    public void removeAppWidget(LauncherAppWidgetInfo launcherInfo) {
        mDesktopItems.remove(launcherInfo);
        launcherInfo.hostView = null;
    }

    public LauncherAppWidgetHost getAppWidgetHost() {
        return mAppWidgetHost;
    }

    static ApplicationInfo addShortcut(Context context, Intent data,
            CellLayout.CellInfo cellInfo, boolean notify) {

        final ApplicationInfo info = infoFromShortcutIntent(context, data);
        LauncherModel.addItemToDatabase(context, info, LauncherSettings.Favorites.CONTAINER_DESKTOP,
                cellInfo.screen, cellInfo.cellX, cellInfo.cellY, notify);

        return info;
    }

    private static ApplicationInfo infoFromShortcutIntent(Context context, Intent data) {
        Intent intent = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_INTENT);
        String name = data.getStringExtra(Intent.EXTRA_SHORTCUT_NAME);
        Parcelable bitmap = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON);

        Drawable icon = null;
        boolean filtered = false;
        boolean customIcon = false;
        ShortcutIconResource iconResource = null;

        if (bitmap != null && bitmap instanceof Bitmap) {
            icon = new FastBitmapDrawable(Utilities.createBitmapThumbnail((Bitmap) bitmap, context));
            filtered = true;
            customIcon = true;
        } else {
            Parcelable extra = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE);
            if (extra != null && extra instanceof ShortcutIconResource) {
                try {
                    iconResource = (ShortcutIconResource) extra;
                    final PackageManager packageManager = context.getPackageManager();
                    Resources resources = packageManager.getResourcesForApplication(
                            iconResource.packageName);
                    final int id = resources.getIdentifier(iconResource.resourceName, null, null);
                    icon = resources.getDrawable(id);
                } catch (Exception e) {
                    Log.w(TAG, "Could not load shortcut icon: " + extra);
                }
            }
        }

        if (icon == null) {
            icon = context.getPackageManager().getDefaultActivityIcon();
        }

        final ApplicationInfo info = new ApplicationInfo();
        info.icon = icon;
        info.filtered = filtered;
        info.title = name;
        info.intent = intent;
        info.customIcon = customIcon;
        info.iconResource = iconResource;

        return info;
    }

    void closeSystemDialogs() {
        getWindow().closeAllPanels();

        try {
            dismissDialog(DIALOG_CREATE_SHORTCUT);
            // Unlock the workspace if the dialog was showing
        } catch (Exception e) {
            // An exception is thrown if the dialog is not visible, which is fine
        }

        try {
            dismissDialog(DIALOG_RENAME_FOLDER);
            // Unlock the workspace if the dialog was showing
        } catch (Exception e) {
            // An exception is thrown if the dialog is not visible, which is fine
        }

        // Whatever we were doing is hereby canceled.
        mWaitingForResult = false;
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        // Close the menu
        if (Intent.ACTION_MAIN.equals(intent.getAction())) {
            // also will cancel mWaitingForResult.
            closeSystemDialogs();

            boolean alreadyOnHome = ((intent.getFlags() & Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT)
                        != Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);
            boolean allAppsVisible = isAllAppsVisible();
            if (!mWorkspace.isDefaultScreenShowing()) {
                mWorkspace.moveToDefaultScreen(alreadyOnHome && !allAppsVisible);
            }
            closeAllApps(alreadyOnHome && allAppsVisible);

            final View v = getWindow().peekDecorView();
            if (v != null && v.getWindowToken() != null) {
                InputMethodManager imm = (InputMethodManager)getSystemService(
                        INPUT_METHOD_SERVICE);
                imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
            }
        }
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        // Do not call super here
        mSavedInstanceState = savedInstanceState;
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putInt(RUNTIME_STATE_CURRENT_SCREEN, mWorkspace.getCurrentScreen());

        final ArrayList<Folder> folders = mWorkspace.getOpenFolders();
        if (folders.size() > 0) {
            final int count = folders.size();
            long[] ids = new long[count];
            for (int i = 0; i < count; i++) {
                final FolderInfo info = folders.get(i).getInfo();
                ids[i] = info.id;
            }
            outState.putLongArray(RUNTIME_STATE_USER_FOLDERS, ids);
        } else {
            super.onSaveInstanceState(outState);
        }

        // TODO should not do this if the drawer is currently closing.
        if (isAllAppsVisible()) {
            outState.putBoolean(RUNTIME_STATE_ALL_APPS_FOLDER, true);
        }

        if (mAddItemCellInfo != null && mAddItemCellInfo.valid && mWaitingForResult) {
            final CellLayout.CellInfo addItemCellInfo = mAddItemCellInfo;
            final CellLayout layout = (CellLayout) mWorkspace.getChildAt(addItemCellInfo.screen);

            outState.putInt(RUNTIME_STATE_PENDING_ADD_SCREEN, addItemCellInfo.screen);
            outState.putInt(RUNTIME_STATE_PENDING_ADD_CELL_X, addItemCellInfo.cellX);
            outState.putInt(RUNTIME_STATE_PENDING_ADD_CELL_Y, addItemCellInfo.cellY);
            outState.putInt(RUNTIME_STATE_PENDING_ADD_SPAN_X, addItemCellInfo.spanX);
            outState.putInt(RUNTIME_STATE_PENDING_ADD_SPAN_Y, addItemCellInfo.spanY);
            outState.putInt(RUNTIME_STATE_PENDING_ADD_COUNT_X, layout.getCountX());
            outState.putInt(RUNTIME_STATE_PENDING_ADD_COUNT_Y, layout.getCountY());
            outState.putBooleanArray(RUNTIME_STATE_PENDING_ADD_OCCUPIED_CELLS,
                   layout.getOccupiedCells());
        }

        if (mFolderInfo != null && mWaitingForResult) {
            outState.putBoolean(RUNTIME_STATE_PENDING_FOLDER_RENAME, true);
            outState.putLong(RUNTIME_STATE_PENDING_FOLDER_RENAME_ID, mFolderInfo.id);
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        try {
            mAppWidgetHost.stopListening();
        } catch (NullPointerException ex) {
            Log.w(TAG, "problem while stopping AppWidgetHost during Launcher destruction", ex);
        }

        TextKeyListener.getInstance().release();

        mModel.stopLoader();

        unbindDesktopItems();
        AppInfoCache.unbindDrawables();

        getContentResolver().unregisterContentObserver(mWidgetObserver);
        
        dismissPreview(mPreviousView);
        dismissPreview(mNextView);

        unregisterReceiver(mCloseSystemDialogsReceiver);
    }

    @Override
    public void startActivityForResult(Intent intent, int requestCode) {
        if (requestCode >= 0) mWaitingForResult = true;
        super.startActivityForResult(intent, requestCode);
    }

    @Override
    public void startSearch(String initialQuery, boolean selectInitialQuery,
            Bundle appSearchData, boolean globalSearch) {

        closeAllApps(true);

        if (initialQuery == null) {
            // Use any text typed in the launcher as the initial query
            initialQuery = getTypedText();
            clearTypedText();
        }
        if (appSearchData == null) {
            appSearchData = new Bundle();
            appSearchData.putString(SearchManager.SOURCE, "launcher-search");
        }

        final SearchManager searchManager =
                (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        searchManager.startSearch(initialQuery, selectInitialQuery, getComponentName(),
            appSearchData, globalSearch);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        if (isWorkspaceLocked()) {
            return false;
        }

        super.onCreateOptionsMenu(menu);
        menu.add(MENU_GROUP_ADD, MENU_ADD, 0, R.string.menu_add)
                .setIcon(android.R.drawable.ic_menu_add)
                .setAlphabeticShortcut('A');
        menu.add(0, MENU_WALLPAPER_SETTINGS, 0, R.string.menu_wallpaper)
                 .setIcon(android.R.drawable.ic_menu_gallery)
                 .setAlphabeticShortcut('W');
        menu.add(0, MENU_SEARCH, 0, R.string.menu_search)
                .setIcon(android.R.drawable.ic_search_category_default)
                .setAlphabeticShortcut(SearchManager.MENU_KEY);
        menu.add(0, MENU_NOTIFICATIONS, 0, R.string.menu_notifications)
                .setIcon(com.android.internal.R.drawable.ic_menu_notifications)
                .setAlphabeticShortcut('N');

        final Intent settings = new Intent(android.provider.Settings.ACTION_SETTINGS);
        settings.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

        menu.add(0, MENU_SETTINGS, 0, R.string.menu_settings)
                .setIcon(android.R.drawable.ic_menu_preferences).setAlphabeticShortcut('P')
                .setIntent(settings);

        return true;
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);

        mMenuAddInfo = mWorkspace.findAllVacantCells(null);
        menu.setGroupEnabled(MENU_GROUP_ADD, mMenuAddInfo != null && mMenuAddInfo.valid);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case MENU_ADD:
                addItems();
                return true;
            case MENU_WALLPAPER_SETTINGS:
                startWallpaper();
                return true;
            case MENU_SEARCH:
                onSearchRequested();
                return true;
            case MENU_NOTIFICATIONS:
                showNotifications();
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    /**
     * Indicates that we want global search for this activity by setting the globalSearch
     * argument for {@link #startSearch} to true.
     */

    @Override
    public boolean onSearchRequested() {
        startSearch(null, false, null, true);
        return true;
    }

    public boolean isWorkspaceLocked() {
        return mWorkspaceLoading || mWaitingForResult;
    }

    private void addItems() {
        closeAllApps(true);
        showAddDialog(mMenuAddInfo);
    }

    void addAppWidget(Intent data) {
        // TODO: catch bad widget exception when sent
        int appWidgetId = data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
        AppWidgetProviderInfo appWidget = mAppWidgetManager.getAppWidgetInfo(appWidgetId);

        if (appWidget.configure != null) {
            // Launch over to configure widget, if needed
            Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_CONFIGURE);
            intent.setComponent(appWidget.configure);
            intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);

            startActivityForResult(intent, REQUEST_CREATE_APPWIDGET);
        } else {
            // Otherwise just add it
            onActivityResult(REQUEST_CREATE_APPWIDGET, Activity.RESULT_OK, data);
        }
    }

    void processShortcut(Intent intent, int requestCodeApplication, int requestCodeShortcut) {
        // Handle case where user selected "Applications"
        String applicationName = getResources().getString(R.string.group_applications);
        String shortcutName = intent.getStringExtra(Intent.EXTRA_SHORTCUT_NAME);

        if (applicationName != null && applicationName.equals(shortcutName)) {
            Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
            mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

            Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);
            pickIntent.putExtra(Intent.EXTRA_INTENT, mainIntent);
            startActivityForResult(pickIntent, requestCodeApplication);
        } else {
            startActivityForResult(intent, requestCodeShortcut);
        }
    }

    void addLiveFolder(Intent intent) {
        // Handle case where user selected "Folder"
        String folderName = getResources().getString(R.string.group_folder);
        String shortcutName = intent.getStringExtra(Intent.EXTRA_SHORTCUT_NAME);

        if (folderName != null && folderName.equals(shortcutName)) {
            addFolder();
        } else {
            startActivityForResult(intent, REQUEST_CREATE_LIVE_FOLDER);
        }
    }

    void addFolder() {
        UserFolderInfo folderInfo = new UserFolderInfo();
        folderInfo.title = getText(R.string.folder_name);

        CellLayout.CellInfo cellInfo = mAddItemCellInfo;
        cellInfo.screen = mWorkspace.getCurrentScreen();
        if (!findSingleSlot(cellInfo)) return;

        // Update the model
        LauncherModel.addItemToDatabase(this, folderInfo,
                LauncherSettings.Favorites.CONTAINER_DESKTOP,
                mWorkspace.getCurrentScreen(), cellInfo.cellX, cellInfo.cellY, false);
        mFolders.put(folderInfo.id, folderInfo);

        // Create the view
        FolderIcon newFolder = FolderIcon.fromXml(R.layout.folder_icon, this,
                (ViewGroup) mWorkspace.getChildAt(mWorkspace.getCurrentScreen()), folderInfo);
        mWorkspace.addInCurrentScreen(newFolder,
                cellInfo.cellX, cellInfo.cellY, 1, 1, isWorkspaceLocked());
    }

    void removeFolder(FolderInfo folder) {
        mFolders.remove(folder.id);
    }

    private void completeAddLiveFolder(Intent data, CellLayout.CellInfo cellInfo) {
        cellInfo.screen = mWorkspace.getCurrentScreen();
        if (!findSingleSlot(cellInfo)) return;

        final LiveFolderInfo info = addLiveFolder(this, data, cellInfo, false);

        if (!mRestoring) {
            final View view = LiveFolderIcon.fromXml(R.layout.live_folder_icon, this,
                (ViewGroup) mWorkspace.getChildAt(mWorkspace.getCurrentScreen()), info);
            mWorkspace.addInCurrentScreen(view, cellInfo.cellX, cellInfo.cellY, 1, 1,
                    isWorkspaceLocked());
        }
    }

    static LiveFolderInfo addLiveFolder(Context context, Intent data,
            CellLayout.CellInfo cellInfo, boolean notify) {

        Intent baseIntent = data.getParcelableExtra(LiveFolders.EXTRA_LIVE_FOLDER_BASE_INTENT);
        String name = data.getStringExtra(LiveFolders.EXTRA_LIVE_FOLDER_NAME);

        Drawable icon = null;
        boolean filtered = false;
        Intent.ShortcutIconResource iconResource = null;

        Parcelable extra = data.getParcelableExtra(LiveFolders.EXTRA_LIVE_FOLDER_ICON);
        if (extra != null && extra instanceof Intent.ShortcutIconResource) {
            try {
                iconResource = (Intent.ShortcutIconResource) extra;
                final PackageManager packageManager = context.getPackageManager();
                Resources resources = packageManager.getResourcesForApplication(
                        iconResource.packageName);
                final int id = resources.getIdentifier(iconResource.resourceName, null, null);
                icon = resources.getDrawable(id);
            } catch (Exception e) {
                Log.w(TAG, "Could not load live folder icon: " + extra);
            }
        }

        if (icon == null) {
            icon = context.getResources().getDrawable(R.drawable.ic_launcher_folder);
        }

        final LiveFolderInfo info = new LiveFolderInfo();
        info.icon = icon;
        info.filtered = filtered;
        info.title = name;
        info.iconResource = iconResource;
        info.uri = data.getData();
        info.baseIntent = baseIntent;
        info.displayMode = data.getIntExtra(LiveFolders.EXTRA_LIVE_FOLDER_DISPLAY_MODE,
                LiveFolders.DISPLAY_MODE_GRID);

        LauncherModel.addItemToDatabase(context, info, LauncherSettings.Favorites.CONTAINER_DESKTOP,
                cellInfo.screen, cellInfo.cellX, cellInfo.cellY, notify);
        mFolders.put(info.id, info);

        return info;
    }

    private boolean findSingleSlot(CellLayout.CellInfo cellInfo) {
        final int[] xy = new int[2];
        if (findSlot(cellInfo, xy, 1, 1)) {
            cellInfo.cellX = xy[0];
            cellInfo.cellY = xy[1];
            return true;
        }
        return false;
    }

    private boolean findSlot(CellLayout.CellInfo cellInfo, int[] xy, int spanX, int spanY) {
        if (!cellInfo.findCellForSpan(xy, spanX, spanY)) {
            boolean[] occupied = mSavedState != null ?
                    mSavedState.getBooleanArray(RUNTIME_STATE_PENDING_ADD_OCCUPIED_CELLS) : null;
            cellInfo = mWorkspace.findAllVacantCells(occupied);
            if (!cellInfo.findCellForSpan(xy, spanX, spanY)) {
                Toast.makeText(this, getString(R.string.out_of_space), Toast.LENGTH_SHORT).show();
                return false;
            }
        }
        return true;
    }

    private void showNotifications() {
        final StatusBarManager statusBar = (StatusBarManager) getSystemService(STATUS_BAR_SERVICE);
        if (statusBar != null) {
            statusBar.expand();
        }
    }

    private void startWallpaper() {
        closeAllApps(true);
        final Intent pickWallpaper = new Intent(Intent.ACTION_SET_WALLPAPER);
        Intent chooser = Intent.createChooser(pickWallpaper,
                getText(R.string.chooser_wallpaper));
        // NOTE: Adds a configure option to the chooser if the wallpaper supports it
        //       Removed in Eclair MR1
//        WallpaperManager wm = (WallpaperManager)
//                getSystemService(Context.WALLPAPER_SERVICE);
//        WallpaperInfo wi = wm.getWallpaperInfo();
//        if (wi != null && wi.getSettingsActivity() != null) {
//            LabeledIntent li = new LabeledIntent(getPackageName(),
//                    R.string.configure_wallpaper, 0);
//            li.setClassName(wi.getPackageName(), wi.getSettingsActivity());
//            chooser.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Intent[] { li });
//        }
        startActivityForResult(chooser, REQUEST_PICK_WALLPAPER);
    }

    /**
     * Registers various content observers. The current implementation registers
     * only a favorites observer to keep track of the favorites applications.
     */
    private void registerContentObservers() {
        ContentResolver resolver = getContentResolver();
        resolver.registerContentObserver(LauncherProvider.CONTENT_APPWIDGET_RESET_URI,
                true, mWidgetObserver);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN) {
            switch (event.getKeyCode()) {
                case KeyEvent.KEYCODE_HOME:
                    return true;
                case KeyEvent.KEYCODE_VOLUME_DOWN:
                    if (SystemProperties.getInt("debug.launcher2.dumpstate", 0) != 0) {
                        dumpState();
                        return true;
                    }
                    break;
            }
        } else if (event.getAction() == KeyEvent.ACTION_UP) {
            switch (event.getKeyCode()) {
                case KeyEvent.KEYCODE_HOME:
                    return true;
            }
        }

        return super.dispatchKeyEvent(event);
    }

    @Override
    public void onBackPressed() {
        if (isAllAppsVisible()) {
            closeAllApps(true);
        } else {
            closeFolder();
        }
        dismissPreview(mPreviousView);
        dismissPreview(mNextView);
    }

    private void closeFolder() {
        Folder folder = mWorkspace.getOpenFolder();
        if (folder != null) {
            closeFolder(folder);
        }
    }

    void closeFolder(Folder folder) {
        folder.getInfo().opened = false;
        ViewGroup parent = (ViewGroup) folder.getParent();
        if (parent != null) {
            parent.removeView(folder);
            if (folder instanceof DropTarget) {
                // Live folders aren't DropTargets.
                mDragController.removeDropTarget((DropTarget)folder);
            }
        }
        folder.onClose();
    }

    /**
     * Re-listen when widgets are reset.
     */
    private void onAppWidgetReset() {
        mAppWidgetHost.startListening();
    }

    /**
     * Go through the and disconnect any of the callbacks in the drawables and the views or we
     * leak the previous Home screen on orientation change.
     */
    private void unbindDesktopItems() {
        for (ItemInfo item: mDesktopItems) {
            item.unbind();
        }
    }

    /**
     * Launches the intent referred by the clicked shortcut.
     *
     * @param v The view representing the clicked shortcut.
     */
    public void onClick(View v) {
        Object tag = v.getTag();
        if (tag instanceof ApplicationInfo) {
            // Open shortcut
            final Intent intent = ((ApplicationInfo) tag).intent;
            int[] pos = new int[2];
            v.getLocationOnScreen(pos);
            intent.setSourceBounds(
                    new Rect(pos[0], pos[1], pos[0]+v.getWidth(), pos[1]+v.getHeight()));
            startActivitySafely(intent);
        } else if (tag instanceof FolderInfo) {
            handleFolderClick((FolderInfo) tag);
        } else if (v == mHandleView) {
            if (isAllAppsVisible()) {
                closeAllApps(true);
            } else {
                showAllApps(true);
            }
        }
    }

    void startActivitySafely(Intent intent) {
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, R.string.activity_not_found, Toast.LENGTH_SHORT).show();
        } catch (SecurityException e) {
            Toast.makeText(this, R.string.activity_not_found, Toast.LENGTH_SHORT).show();
            Log.e(TAG, "Launcher does not have the permission to launch " + intent +
                    ". Make sure to create a MAIN intent-filter for the corresponding activity " +
                    "or use the exported attribute for this activity.", e);
        }
    }

    private void handleFolderClick(FolderInfo folderInfo) {
        if (!folderInfo.opened) {
            // Close any open folder
            closeFolder();
            // Open the requested folder
            openFolder(folderInfo);
        } else {
            // Find the open folder...
            Folder openFolder = mWorkspace.getFolderForTag(folderInfo);
            int folderScreen;
            if (openFolder != null) {
                folderScreen = mWorkspace.getScreenForView(openFolder);
                // .. and close it
                closeFolder(openFolder);
                if (folderScreen != mWorkspace.getCurrentScreen()) {
                    // Close any folder open on the current screen
                    closeFolder();
                    // Pull the folder onto this screen
                    openFolder(folderInfo);
                }
            }
        }
    }

    /**
     * Opens the user fodler described by the specified tag. The opening of the folder
     * is animated relative to the specified View. If the View is null, no animation
     * is played.
     *
     * @param folderInfo The FolderInfo describing the folder to open.
     */
    private void openFolder(FolderInfo folderInfo) {
        Folder openFolder;

        if (folderInfo instanceof UserFolderInfo) {
            openFolder = UserFolder.fromXml(this);
        } else if (folderInfo instanceof LiveFolderInfo) {
            openFolder = com.android.launcher2.LiveFolder.fromXml(this, folderInfo);
        } else {
            return;
        }

        openFolder.setDragController(mDragController);
        openFolder.setLauncher(this);

        openFolder.bind(folderInfo);
        folderInfo.opened = true;

        mWorkspace.addInScreen(openFolder, folderInfo.screen, 0, 0, 4, 4);
        openFolder.onOpen();
    }

    public boolean onLongClick(View v) {
        switch (v.getId()) {
            case R.id.previous_screen:
                if (!isAllAppsVisible()) {
                    mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                            HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
                    showPreviews(v);
                }
                return true;
            case R.id.next_screen:
                if (!isAllAppsVisible()) {
                    mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                            HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
                    showPreviews(v);
                }
                return true;
            case R.id.all_apps_button:
                if (!isAllAppsVisible()) {
                    mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                            HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
                    showPreviews(v);
                }
                return true;
        }

        if (isWorkspaceLocked()) {
            return false;
        }

        if (!(v instanceof CellLayout)) {
            v = (View) v.getParent();
        }

        CellLayout.CellInfo cellInfo = (CellLayout.CellInfo) v.getTag();

        // This happens when long clicking an item with the dpad/trackball
        if (cellInfo == null) {
            return true;
        }

        if (mWorkspace.allowLongPress()) {
            if (cellInfo.cell == null) {
                if (cellInfo.valid) {
                    // User long pressed on empty space
                    mWorkspace.setAllowLongPress(false);
                    showAddDialog(cellInfo);
                }
            } else {
                if (!(cellInfo.cell instanceof Folder)) {
                    // User long pressed on an item
                    mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                            HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
                    mWorkspace.startDrag(cellInfo);
                }
            }
        }
        return true;
    }

    @SuppressWarnings({"unchecked"})
    private void dismissPreview(final View v) {
        final PopupWindow window = (PopupWindow) v.getTag();
        if (window != null) {
            window.setOnDismissListener(new PopupWindow.OnDismissListener() {
                public void onDismiss() {
                    ViewGroup group = (ViewGroup) v.getTag(R.id.workspace);
                    int count = group.getChildCount();
                    for (int i = 0; i < count; i++) {
                        ((ImageView) group.getChildAt(i)).setImageDrawable(null);
                    }
                    ArrayList<Bitmap> bitmaps = (ArrayList<Bitmap>) v.getTag(R.id.icon);
                    for (Bitmap bitmap : bitmaps) bitmap.recycle();

                    v.setTag(R.id.workspace, null);
                    v.setTag(R.id.icon, null);
                    window.setOnDismissListener(null);
                }
            });
            window.dismiss();
        }
        v.setTag(null);
    }

    private void showPreviews(View anchor) {
        showPreviews(anchor, 0, mWorkspace.getChildCount());
    }

    private void showPreviews(final View anchor, int start, int end) {
        final Resources resources = getResources();
        final Workspace workspace = mWorkspace;

        CellLayout cell = ((CellLayout) workspace.getChildAt(start));
        
        float max = workspace.getChildCount();
        
        final Rect r = new Rect();
        resources.getDrawable(R.drawable.preview_background).getPadding(r);
        int extraW = (int) ((r.left + r.right) * max);
        int extraH = r.top + r.bottom;

        int aW = cell.getWidth() - extraW;
        float w = aW / max;

        int width = cell.getWidth();
        int height = cell.getHeight();
        int x = cell.getLeftPadding();
        int y = cell.getTopPadding();
        width -= (x + cell.getRightPadding());
        height -= (y + cell.getBottomPadding());

        float scale = w / width;

        int count = end - start;

        final float sWidth = width * scale;
        float sHeight = height * scale;

        LinearLayout preview = new LinearLayout(this);

        PreviewTouchHandler handler = new PreviewTouchHandler(anchor);
        ArrayList<Bitmap> bitmaps = new ArrayList<Bitmap>(count);

        for (int i = start; i < end; i++) {
            ImageView image = new ImageView(this);
            cell = (CellLayout) workspace.getChildAt(i);

            final Bitmap bitmap = Bitmap.createBitmap((int) sWidth, (int) sHeight,
                    Bitmap.Config.ARGB_8888);

            final Canvas c = new Canvas(bitmap);
            c.scale(scale, scale);
            c.translate(-cell.getLeftPadding(), -cell.getTopPadding());
            cell.dispatchDraw(c);

            image.setBackgroundDrawable(resources.getDrawable(R.drawable.preview_background));
            image.setImageBitmap(bitmap);
            image.setTag(i);
            image.setOnClickListener(handler);
            image.setOnFocusChangeListener(handler);
            image.setFocusable(true);
            if (i == mWorkspace.getCurrentScreen()) image.requestFocus();

            preview.addView(image,
                    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);

            bitmaps.add(bitmap);            
        }

        final PopupWindow p = new PopupWindow(this);
        p.setContentView(preview);
        p.setWidth((int) (sWidth * count + extraW));
        p.setHeight((int) (sHeight + extraH));
        p.setAnimationStyle(R.style.AnimationPreview);
        p.setOutsideTouchable(true);
        p.setFocusable(true);
        p.setBackgroundDrawable(new ColorDrawable(0));
        p.showAsDropDown(anchor, 0, 0);

        p.setOnDismissListener(new PopupWindow.OnDismissListener() {
            public void onDismiss() {
                dismissPreview(anchor);
            }
        });

        anchor.setTag(p);
        anchor.setTag(R.id.workspace, preview);
        anchor.setTag(R.id.icon, bitmaps);        
    }

    class PreviewTouchHandler implements View.OnClickListener, Runnable, View.OnFocusChangeListener {
        private final View mAnchor;

        public PreviewTouchHandler(View anchor) {
            mAnchor = anchor;
        }

        public void onClick(View v) {
            mWorkspace.snapToScreen((Integer) v.getTag());
            v.post(this);
        }

        public void run() {
            dismissPreview(mAnchor);            
        }

        public void onFocusChange(View v, boolean hasFocus) {
            if (hasFocus) {
                mWorkspace.snapToScreen((Integer) v.getTag());
            }
        }
    }

    Workspace getWorkspace() {
        return mWorkspace;
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case DIALOG_CREATE_SHORTCUT:
                return new CreateShortcut().createDialog();
            case DIALOG_RENAME_FOLDER:
                return new RenameFolder().createDialog();
        }

        return super.onCreateDialog(id);
    }

    @Override
    protected void onPrepareDialog(int id, Dialog dialog) {
        switch (id) {
            case DIALOG_CREATE_SHORTCUT:
                break;
            case DIALOG_RENAME_FOLDER:
                if (mFolderInfo != null) {
                    EditText input = (EditText) dialog.findViewById(R.id.folder_name);
                    final CharSequence text = mFolderInfo.title;
                    input.setText(text);
                    input.setSelection(0, text.length());
                }
                break;
        }
    }

    void showRenameDialog(FolderInfo info) {
        mFolderInfo = info;
        mWaitingForResult = true;
        showDialog(DIALOG_RENAME_FOLDER);
    }

    private void showAddDialog(CellLayout.CellInfo cellInfo) {
        mAddItemCellInfo = cellInfo;
        mWaitingForResult = true;
        showDialog(DIALOG_CREATE_SHORTCUT);
    }

    private void pickShortcut(int requestCode, int title) {
        Bundle bundle = new Bundle();

        ArrayList<String> shortcutNames = new ArrayList<String>();
        shortcutNames.add(getString(R.string.group_applications));
        bundle.putStringArrayList(Intent.EXTRA_SHORTCUT_NAME, shortcutNames);

        ArrayList<ShortcutIconResource> shortcutIcons = new ArrayList<ShortcutIconResource>();
        shortcutIcons.add(ShortcutIconResource.fromContext(Launcher.this,
                        R.drawable.ic_launcher_application));
        bundle.putParcelableArrayList(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, shortcutIcons);

        Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);
        pickIntent.putExtra(Intent.EXTRA_INTENT, new Intent(Intent.ACTION_CREATE_SHORTCUT));
        pickIntent.putExtra(Intent.EXTRA_TITLE, getText(title));
        pickIntent.putExtras(bundle);

        startActivityForResult(pickIntent, requestCode);
    }

    private class RenameFolder {
        private EditText mInput;

        Dialog createDialog() {
            mWaitingForResult = true;
            final View layout = View.inflate(Launcher.this, R.layout.rename_folder, null);
            mInput = (EditText) layout.findViewById(R.id.folder_name);

            AlertDialog.Builder builder = new AlertDialog.Builder(Launcher.this);
            builder.setIcon(0);
            builder.setTitle(getString(R.string.rename_folder_title));
            builder.setCancelable(true);
            builder.setOnCancelListener(new Dialog.OnCancelListener() {
                public void onCancel(DialogInterface dialog) {
                    cleanup();
                }
            });
            builder.setNegativeButton(getString(R.string.cancel_action),
                new Dialog.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        cleanup();
                    }
                }
            );
            builder.setPositiveButton(getString(R.string.rename_action),
                new Dialog.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        changeFolderName();
                    }
                }
            );
            builder.setView(layout);

            final AlertDialog dialog = builder.create();
            dialog.setOnShowListener(new DialogInterface.OnShowListener() {
                public void onShow(DialogInterface dialog) {
                    mInput.requestFocus();
                    InputMethodManager inputManager = (InputMethodManager)
                            getSystemService(Context.INPUT_METHOD_SERVICE);
                    inputManager.showSoftInput(mInput, 0);
                }
            });

            return dialog;
        }

        private void changeFolderName() {
            final String name = mInput.getText().toString();
            if (!TextUtils.isEmpty(name)) {
                // Make sure we have the right folder info
                mFolderInfo = mFolders.get(mFolderInfo.id);
                mFolderInfo.title = name;
                LauncherModel.updateItemInDatabase(Launcher.this, mFolderInfo);

                if (mWorkspaceLoading) {
                    lockAllApps();
                    mModel.setWorkspaceDirty();
                    mModel.startLoader(Launcher.this, false);
                } else {
                    final FolderIcon folderIcon = (FolderIcon)
                            mWorkspace.getViewForTag(mFolderInfo);
                    if (folderIcon != null) {
                        folderIcon.setText(name);
                        getWorkspace().requestLayout();
                    } else {
                        lockAllApps();
                        mModel.setWorkspaceDirty();
                        mWorkspaceLoading = true;
                        mModel.startLoader(Launcher.this, false);
                    }
                }
            }
            cleanup();
        }

        private void cleanup() {
            dismissDialog(DIALOG_RENAME_FOLDER);
            mWaitingForResult = false;
            mFolderInfo = null;
        }
    }

    boolean isAllAppsVisible() {
        return mAllAppsGrid.isVisible();
    }

    void showAllApps(boolean animated) {
        mAllAppsGrid.zoom(1.0f, animated);

        mAllAppsGrid.setFocusable(true);
        mAllAppsGrid.requestFocus();
        
        // TODO: fade these two too
        mDeleteZone.setVisibility(View.GONE);
    }

    /**
     * Things to test when changing this code.
     *   - Home from workspace
     *          - from center screen
     *          - from other screens
     *   - Home from all apps
     *          - from center screen
     *          - from other screens
     *   - Back from all apps
     *          - from center screen
     *          - from other screens
     *   - Launch app from workspace and quit
     *          - with back
     *          - with home
     *   - Launch app from all apps and quit
     *          - with back
     *          - with home
     *   - Go to a screen that's not the default, then all
     *     apps, and launch and app, and go back
     *          - with back
     *          -with home
     *   - On workspace, long press power and go back
     *          - with back
     *          - with home
     *   - On all apps, long press power and go back
     *          - with back
     *          - with home
     *   - On workspace, power off
     *   - On all apps, power off
     *   - Launch an app and turn off the screen while in that app
     *          - Go back with home key
     *          - Go back with back key  TODO: make this not go to workspace
     *          - From all apps
     *          - From workspace
     */
    void closeAllApps(boolean animated) {
        if (mAllAppsGrid.isVisible()) {
            mAllAppsGrid.zoom(0.0f, animated);
            mAllAppsGrid.setFocusable(false);
            mWorkspace.getChildAt(mWorkspace.getCurrentScreen()).requestFocus();
        }
    }

    void lockAllApps() {
        // TODO
    }

    void unlockAllApps() {
        // TODO
    }

    /**
     * Displays the shortcut creation dialog and launches, if necessary, the
     * appropriate activity.
     */
    private class CreateShortcut implements DialogInterface.OnClickListener,
            DialogInterface.OnCancelListener, DialogInterface.OnDismissListener,
            DialogInterface.OnShowListener {

        private AddAdapter mAdapter;

        Dialog createDialog() {
            mWaitingForResult = true;

            mAdapter = new AddAdapter(Launcher.this);

            final AlertDialog.Builder builder = new AlertDialog.Builder(Launcher.this);
            builder.setTitle(getString(R.string.menu_item_add_item));
            builder.setAdapter(mAdapter, this);

            builder.setInverseBackgroundForced(true);

            AlertDialog dialog = builder.create();
            dialog.setOnCancelListener(this);
            dialog.setOnDismissListener(this);
            dialog.setOnShowListener(this);

            return dialog;
        }

        public void onCancel(DialogInterface dialog) {
            mWaitingForResult = false;
            cleanup();
        }

        public void onDismiss(DialogInterface dialog) {
        }

        private void cleanup() {
            try {
                dismissDialog(DIALOG_CREATE_SHORTCUT);
            } catch (Exception e) {
                // An exception is thrown if the dialog is not visible, which is fine
            }
        }

        /**
         * Handle the action clicked in the "Add to home" dialog.
         */
        public void onClick(DialogInterface dialog, int which) {
            Resources res = getResources();
            cleanup();

            switch (which) {
                case AddAdapter.ITEM_SHORTCUT: {
                    // Insert extra item to handle picking application
                    pickShortcut(REQUEST_PICK_SHORTCUT, R.string.title_select_shortcut);
                    break;
                }

                case AddAdapter.ITEM_APPWIDGET: {
                    int appWidgetId = Launcher.this.mAppWidgetHost.allocateAppWidgetId();

                    Intent pickIntent = new Intent(AppWidgetManager.ACTION_APPWIDGET_PICK);
                    pickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
                    // start the pick activity
                    startActivityForResult(pickIntent, REQUEST_PICK_APPWIDGET);
                    break;
                }

                case AddAdapter.ITEM_LIVE_FOLDER: {
                    // Insert extra item to handle inserting folder
                    Bundle bundle = new Bundle();

                    ArrayList<String> shortcutNames = new ArrayList<String>();
                    shortcutNames.add(res.getString(R.string.group_folder));
                    bundle.putStringArrayList(Intent.EXTRA_SHORTCUT_NAME, shortcutNames);

                    ArrayList<ShortcutIconResource> shortcutIcons =
                            new ArrayList<ShortcutIconResource>();
                    shortcutIcons.add(ShortcutIconResource.fromContext(Launcher.this,
                            R.drawable.ic_launcher_folder));
                    bundle.putParcelableArrayList(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, shortcutIcons);

                    Intent pickIntent = new Intent(Intent.ACTION_PICK_ACTIVITY);
                    pickIntent.putExtra(Intent.EXTRA_INTENT,
                            new Intent(LiveFolders.ACTION_CREATE_LIVE_FOLDER));
                    pickIntent.putExtra(Intent.EXTRA_TITLE,
                            getText(R.string.title_select_live_folder));
                    pickIntent.putExtras(bundle);

                    startActivityForResult(pickIntent, REQUEST_PICK_LIVE_FOLDER);
                    break;
                }

                case AddAdapter.ITEM_WALLPAPER: {
                    startWallpaper();
                    break;
                }
            }
        }

        public void onShow(DialogInterface dialog) {
        }
    }

    /**
     * Receives notifications when applications are added/removed.
     */
    private class CloseSystemDialogsIntentReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            closeSystemDialogs();
            String reason = intent.getStringExtra("reason");
            if (!"homekey".equals(reason)) {
                boolean animate = true;
                if (mPaused || "lock".equals(reason)) {
                    animate = false;
                }
                closeAllApps(animate);
            }
        }
    }

    /**
     * Receives notifications whenever the appwidgets are reset.
     */
    private class AppWidgetResetObserver extends ContentObserver {
        public AppWidgetResetObserver() {
            super(new Handler());
        }

        @Override
        public void onChange(boolean selfChange) {
            onAppWidgetReset();
        }
    }

    /**
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public int getCurrentWorkspaceScreen() {
        return mWorkspace.getCurrentScreen();
    }

    /**
     * Refreshes the shortcuts shown on the workspace.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void startBinding() {
        final Workspace workspace = mWorkspace;
        int count = workspace.getChildCount();
        for (int i = 0; i < count; i++) {
            // Use removeAllViewsInLayout() to avoid an extra requestLayout() and invalidate().
            ((ViewGroup) workspace.getChildAt(i)).removeAllViewsInLayout();
        }

        if (DEBUG_USER_INTERFACE) {
            android.widget.Button finishButton = new android.widget.Button(this);
            finishButton.setText("Finish");
            workspace.addInScreen(finishButton, 1, 0, 0, 1, 1);

            finishButton.setOnClickListener(new android.widget.Button.OnClickListener() {
                public void onClick(View v) {
                    finish();
                }
            });
        }
    }

    /**
     * Bind the items start-end from the list.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindItems(ArrayList<ItemInfo> shortcuts, int start, int end) {

        final Workspace workspace = mWorkspace;

        for (int i=start; i<end; i++) {
            final ItemInfo item = shortcuts.get(i);
            mDesktopItems.add(item);
            switch (item.itemType) {
                case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                    final View shortcut = createShortcut((ApplicationInfo) item);
                    workspace.addInScreen(shortcut, item.screen, item.cellX, item.cellY, 1, 1,
                            false);
                    break;
                case LauncherSettings.Favorites.ITEM_TYPE_USER_FOLDER:
                    final FolderIcon newFolder = FolderIcon.fromXml(R.layout.folder_icon, this,
                            (ViewGroup) workspace.getChildAt(workspace.getCurrentScreen()),
                            (UserFolderInfo) item);
                    workspace.addInScreen(newFolder, item.screen, item.cellX, item.cellY, 1, 1,
                            false);
                    break;
                case LauncherSettings.Favorites.ITEM_TYPE_LIVE_FOLDER:
                    final FolderIcon newLiveFolder = LiveFolderIcon.fromXml(
                            R.layout.live_folder_icon, this,
                            (ViewGroup) workspace.getChildAt(workspace.getCurrentScreen()),
                            (LiveFolderInfo) item);
                    workspace.addInScreen(newLiveFolder, item.screen, item.cellX, item.cellY, 1, 1,
                            false);
                    break;
            }
        }

        workspace.requestLayout();
    }

    /**
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindFolders(HashMap<Long, FolderInfo> folders) {
        mFolders.clear();
        mFolders.putAll(folders);
    }

    /**
     * Add the views for a widget to the workspace.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindAppWidget(LauncherAppWidgetInfo item) {
        final Workspace workspace = mWorkspace;

        final int appWidgetId = item.appWidgetId;
        final AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
        item.hostView = mAppWidgetHost.createView(this, appWidgetId, appWidgetInfo);

        item.hostView.setAppWidget(appWidgetId, appWidgetInfo);
        item.hostView.setTag(item);

        workspace.addInScreen(item.hostView, item.screen, item.cellX,
                item.cellY, item.spanX, item.spanY, false);

        workspace.requestLayout();

        mDesktopItems.add(item);
    }

    /**
     * Callback saying that there aren't any more items to bind.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void finishBindingItems() {
        if (mSavedState != null) {
            if (!mWorkspace.hasFocus()) {
                mWorkspace.getChildAt(mWorkspace.getCurrentScreen()).requestFocus();
            }

            final long[] userFolders = mSavedState.getLongArray(RUNTIME_STATE_USER_FOLDERS);
            if (userFolders != null) {
                for (long folderId : userFolders) {
                    final FolderInfo info = mFolders.get(folderId);
                    if (info != null) {
                        openFolder(info);
                    }
                }
                final Folder openFolder = mWorkspace.getOpenFolder();
                if (openFolder != null) {
                    openFolder.requestFocus();
                }
            }

            mSavedState = null;
        }

        if (mSavedInstanceState != null) {
            super.onRestoreInstanceState(mSavedInstanceState);
            mSavedInstanceState = null;
        }

        mWorkspaceLoading = false;
    }

    /**
     * Add the icons for all apps.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindAllApplications(ArrayList<ApplicationInfo> apps) {
        mAllAppsGrid.setApps(apps);
    }

    /**
     * A package was installed.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindPackageAdded(ArrayList<ApplicationInfo> apps) {
        removeDialog(DIALOG_CREATE_SHORTCUT);
        mAllAppsGrid.addApps(apps);
    }

    /**
     * A package was updated.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindPackageUpdated(String packageName, ArrayList<ApplicationInfo> apps) {
        removeDialog(DIALOG_CREATE_SHORTCUT);
        mWorkspace.updateShortcutsForPackage(packageName);
        mAllAppsGrid.updateApps(packageName, apps);
    }

    /**
     * A package was uninstalled.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindPackageRemoved(String packageName, ArrayList<ApplicationInfo> apps) {
        removeDialog(DIALOG_CREATE_SHORTCUT);
        mWorkspace.removeShortcutsForPackage(packageName);
        mAllAppsGrid.removeApps(apps);
    }

    /**
     * Prints out out state for debugging.
     */
    public void dumpState() {
        Log.d(TAG, "BEGIN launcher2 dump state for launcher " + this);
        Log.d(TAG, "mSavedState=" + mSavedState);
        Log.d(TAG, "mWorkspaceLoading=" + mWorkspaceLoading);
        Log.d(TAG, "mRestoring=" + mRestoring);
        Log.d(TAG, "mWaitingForResult=" + mWaitingForResult);
        Log.d(TAG, "mSavedInstanceState=" + mSavedInstanceState);
        Log.d(TAG, "mDesktopItems.size=" + mDesktopItems.size());
        Log.d(TAG, "mFolders.size=" + mFolders.size());
        mModel.dumpState();
        mAllAppsGrid.dumpState();
        Log.d(TAG, "END launcher2 dump state");
    }
}