Line data    Source code

       1             : import "dart:async";
       2             : 
       3             : import "package:errorlookup/core/data/source/settings_data_source.dart";
       4             : import "package:errorlookup/core/models/result.dart";
       5             : import "package:errorlookup/core/models/theme_data.dart";
       6             : import "package:shared_preferences/shared_preferences.dart";
       7             : 
       8             : /// データ層の実装
       9             : class LocalSettingsDataSource implements SettingsDataSource {
      10             :   /// テーマ設定のプリファレンスマップ
      11             :   static const _themeValue = {
      12             :     ThemeMode.system: "theme_system",
      13             :     ThemeMode.dark: "theme_dark",
      14             :     ThemeMode.light: "theme_light"
      15             :   };
      16             : 
      17             :   /// テーマ設定のインバースマップ
      18           2 :   static final _themeValueInverse =
      19           3 :       _themeValue.map((key, value) => MapEntry(value, key));
      20             : 
      21             :   static const _themeKey = "theme";
      22             : 
      23             :   /// テーマ設定のストリーム
      24             :   final _themeSettingStreamController = StreamController<ThemeMode>.broadcast();
      25             : 
      26           1 :   LocalSettingsDataSource({bool initialize = true}) {
      27             :     if (initialize) {
      28           1 :       init();
      29             :     }
      30             :   }
      31             : 
      32           1 :   Future<void> init() async {
      33           1 :     final prefs = await SharedPreferences.getInstance();
      34           1 :     final savedValue = prefs.getString(_themeKey);
      35             :     if (savedValue == null) {
      36           1 :       prefs.setString(_themeKey, "theme_system");
      37           2 :       _themeSettingStreamController.sink
      38           3 :           .add(_themeValueInverse["theme_system"]!);
      39             :     } else {
      40           5 :       _themeSettingStreamController.sink.add(_themeValueInverse[savedValue]!);
      41             :     }
      42             :   }
      43             : 
      44           1 :   @override
      45             :   Stream<ThemeMode> getThemeSettingStream() {
      46           2 :     return _themeSettingStreamController.stream;
      47             :   }
      48             : 
      49           1 :   @override
      50             :   Future<Result<bool, Exception>> saveThemeSetting(
      51             :       {required final ThemeMode newMode}) async {
      52           1 :     final prefs = await SharedPreferences.getInstance();
      53           1 :     final convertedValue = _themeValue[newMode];
      54             :     if (convertedValue == null) {
      55           0 :       return Failure(Exception("preference value is not found"));
      56             :     }
      57           1 :     final ret = await prefs.setString(_themeKey, convertedValue);
      58             :     if (!ret) {
      59           0 :       return Failure(Exception("SharedPreferences.setString fail"));
      60             :     }
      61           3 :     _themeSettingStreamController.sink.add(newMode);
      62             :     return const Success(true);
      63             :   }
      64             : }