1/*
2 * Copyright (C) 2014 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.camera.settings;
18
19import android.app.Activity;
20import android.app.Application;
21import android.content.Context;
22import android.preference.SwitchPreference;
23import android.util.AttributeSet;
24
25import com.android.camera.app.CameraApp;
26import com.android.camera.app.CameraServicesImpl;
27
28/**
29 * This class allows Settings UIs to display and set boolean values controlled
30 * via the {@link SettingManager}. The Default {@link SwitchPreference} uses
31 * {@link android.content.SharedPreferences} as a backing store; since the
32 * {@link SettingManager} stores all settings as Strings we need to ensure we
33 * get and set boolean settings through the manager.
34 */
35public class ManagedSwitchPreference extends SwitchPreference {
36    public ManagedSwitchPreference(Context context) {
37        super(context);
38    }
39
40    public ManagedSwitchPreference(Context context, AttributeSet attrs) {
41        super(context, attrs);
42    }
43
44    public ManagedSwitchPreference(Context context, AttributeSet attrs, int defStyle) {
45        super(context, attrs, defStyle);
46    }
47
48    @Override
49    public boolean getPersistedBoolean(boolean defaultReturnValue) {
50        CameraApp cameraApp = getCameraApp();
51        if (cameraApp == null) {
52            // The context and app may not be initialized upon initial inflation of the
53            // preference from XML. In that case return the default value.
54            return defaultReturnValue;
55        }
56        SettingsManager settingsManager = CameraServicesImpl.instance().getSettingsManager();
57        if (settingsManager != null) {
58            return settingsManager.getBoolean(SettingsManager.SCOPE_GLOBAL, getKey());
59        } else {
60            // If the SettingsManager is for some reason not initialized,
61            // perhaps triggered by a monkey, return default value.
62            return defaultReturnValue;
63        }
64    }
65
66    @Override
67    public boolean persistBoolean(boolean value) {
68        CameraApp cameraApp = getCameraApp();
69        if (cameraApp == null) {
70            // The context may not be initialized upon initial inflation of the
71            // preference from XML. In that case return false to note the value won't
72            // be persisted.
73            return false;
74        }
75        SettingsManager settingsManager = CameraServicesImpl.instance().getSettingsManager();
76        if (settingsManager != null) {
77            settingsManager.set(SettingsManager.SCOPE_GLOBAL, getKey(), value);
78            return true;
79        } else {
80            // If the SettingsManager is for some reason not initialized,
81            // perhaps triggered by a monkey, return false to note the value
82            // was not persisted.
83            return false;
84        }
85    }
86
87    private CameraApp getCameraApp() {
88        Context context = getContext();
89        if (context instanceof Activity) {
90            Application application = ((Activity) context).getApplication();
91            if (application instanceof CameraApp) {
92                return (CameraApp) application;
93            }
94        }
95        return null;
96    }
97}
98