56 lines
1.6 KiB
Dart
56 lines
1.6 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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/// 主題提供者 - 管理明暗主題切換
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///
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/// 功能：
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/// - 支持淺色/深色/跟隨系統三種模式
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/// - 持久化主題設置到本地存儲
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/// - 提供主題切換方法
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class ThemeProvider extends ChangeNotifier {
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static const String _themeModeKey = 'theme_mode';
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ThemeMode _themeMode = ThemeMode.dark;
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/// 當前主題模式
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ThemeMode get themeMode => _themeMode;
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/// 是否為深色模式
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bool get isDarkMode => _themeMode == ThemeMode.dark;
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/// 初始化主題設置（從本地存儲加載）
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Future<void> init() async {
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final prefs = await SharedPreferences.getInstance();
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final modeString = prefs.getString(_themeModeKey);
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if (modeString != null) {
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_themeMode = ThemeMode.values.firstWhere(
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(mode) => mode.toString() == modeString,
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orElse: () => ThemeMode.dark,
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);
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notifyListeners();
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}
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}
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/// 切換主題（淺色/深色）
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Future<void> toggleTheme() async {
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_themeMode = _themeMode == ThemeMode.light ? ThemeMode.dark : ThemeMode.light;
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await _saveThemeMode();
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notifyListeners();
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}
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/// 設置主題模式
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Future<void> setThemeMode(ThemeMode mode) async {
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if (_themeMode == mode) return;
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_themeMode = mode;
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await _saveThemeMode();
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notifyListeners();
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}
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/// 保存主題設置到本地存儲
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Future<void> _saveThemeMode() async {
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final prefs = await SharedPreferences.getInstance();
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await prefs.setString(_themeModeKey, _themeMode.toString());
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}
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}
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