wangjia
26 lines
766 B
Dart
26 lines
766 B
Dart
import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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const _kKey = 'app_theme';
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const _kValid = {'a', 'b', 'c'};
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class ThemeController extends StateNotifier<String> {
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ThemeController() : super('a');
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Future<void> restore() async {
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final prefs = await SharedPreferences.getInstance();
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final v = prefs.getString(_kKey);
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if (v != null && _kValid.contains(v)) state = v;
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}
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Future<void> set(String key) async {
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if (!_kValid.contains(key)) return;
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state = key;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setString(_kKey, key);
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}
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}
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final themeControllerProvider =
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StateNotifierProvider<ThemeController, String>((ref) => ThemeController());
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