Move LauncherApplication's state and code to LauncherAppState.

This removes Launcher's static data and other state out of
the Application object. Now LauncherApplication (extends
Application) exists only to instantiate LauncherAppState.

Change-Id: I4e323bd78b77536b92054105536a55c0c2c19ba8

1 files changed, 163 insertions, 0 deletions

diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
new file mode 100644
index 000000000..fb49d9398
--- /dev/null
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2013 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.launcher3;
+
+import android.app.SearchManager;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.res.Configuration;
+import android.database.ContentObserver;
+import android.os.Handler;
+
+import java.lang.ref.WeakReference;
+
+public class LauncherAppState {
+    private Context mContext;
+    private LauncherModel mModel;
+    private IconCache mIconCache;
+    private WidgetPreviewLoader.CacheDb mWidgetPreviewCacheDb;
+    private static boolean sIsScreenLarge;
+    private static float sScreenDensity;
+    private static int sLongPressTimeout = 300;
+    private static final String sSharedPreferencesKey = "com.android.launcher3.prefs";
+    WeakReference<LauncherProvider> mLauncherProvider;
+
+    private static LauncherAppState INSTANCE;
+
+    private static final LauncherAppState INSTANCE = new LauncherAppState();
+
+    public static LauncherAppState getInstance() {
+        return INSTANCE;
+    }
+
+    public static void init(Context context) {
+        INSTANCE.initialize(context);
+    }
+
+    public Context getContext() {
+        return mContext;
+    }
+
+    private LauncherAppState() { }
+
+    private void initialize(Context context) {
+        mContext = context;
+
+        // set sIsScreenXLarge and sScreenDensity *before* creating icon cache
+        sIsScreenLarge = context.getResources().getBoolean(R.bool.is_large_screen);
+        sScreenDensity = context.getResources().getDisplayMetrics().density;
+
+        mWidgetPreviewCacheDb = new WidgetPreviewLoader.CacheDb(context);
+        mIconCache = new IconCache(context);
+        mModel = new LauncherModel(context, mIconCache);
+
+        // Register intent receivers
+        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
+        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
+        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
+        filter.addDataScheme("package");
+        context.registerReceiver(mModel, filter);
+        filter = new IntentFilter();
+        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
+        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
+        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
+        filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
+        context.registerReceiver(mModel, filter);
+        filter = new IntentFilter();
+        filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED);
+        context.registerReceiver(mModel, filter);
+        filter = new IntentFilter();
+        filter.addAction(SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED);
+        context.registerReceiver(mModel, filter);
+
+        // Register for changes to the favorites
+        ContentResolver resolver = context.getContentResolver();
+        resolver.registerContentObserver(LauncherSettings.Favorites.CONTENT_URI, true,
+                mFavoritesObserver);
+    }
+
+    /**
+     * Call from Application.onTerminate(), which is not guaranteed to ever be called.
+     */
+    public void onTerminate() {
+        mContext.unregisterReceiver(mModel);
+
+        ContentResolver resolver = mContext.getContentResolver();
+        resolver.unregisterContentObserver(mFavoritesObserver);
+    }
+
+    /**
+     * Receives notifications whenever the user favorites have changed.
+     */
+    private final ContentObserver mFavoritesObserver = new ContentObserver(new Handler()) {
+        @Override
+        public void onChange(boolean selfChange) {
+            // If the database has ever changed, then we really need to force a reload of the
+            // workspace on the next load
+            mModel.resetLoadedState(false, true);
+            mModel.startLoaderFromBackground();
+        }
+    };
+
+    LauncherModel setLauncher(Launcher launcher) {
+        mModel.initialize(launcher);
+        return mModel;
+    }
+
+    IconCache getIconCache() {
+        return mIconCache;
+    }
+
+    LauncherModel getModel() {
+        return mModel;
+    }
+
+    WidgetPreviewLoader.CacheDb getWidgetPreviewCacheDb() {
+        return mWidgetPreviewCacheDb;
+    }
+
+   void setLauncherProvider(LauncherProvider provider) {
+        mLauncherProvider = new WeakReference<LauncherProvider>(provider);
+    }
+
+    LauncherProvider getLauncherProvider() {
+        return mLauncherProvider.get();
+    }
+
+    public static String getSharedPreferencesKey() {
+        return sSharedPreferencesKey;
+    }
+
+    public static boolean isScreenLarge() {
+        return sIsScreenLarge;
+    }
+
+    public static boolean isScreenLandscape(Context context) {
+        return context.getResources().getConfiguration().orientation ==
+            Configuration.ORIENTATION_LANDSCAPE;
+    }
+
+    public static float getScreenDensity() {
+        return sScreenDensity;
+    }
+
+    public static int getLongPressTimeout() {
+        return sLongPressTimeout;
+    }
+}