55 lines
1.6 KiB
Dart
55 lines
1.6 KiB
Dart
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import 'package:flutter/material.dart';
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import 'package:flutter_bloc/flutter_bloc.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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/// 全局主题管理 Cubit（仿 LocaleCubit 模式）
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/// 支持 light / dark / system 三态，持久化到 SharedPreferences
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class ThemeCubit extends Cubit<ThemeMode> {
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static const String _themeKey = 'app_theme_mode';
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ThemeCubit() : super(ThemeMode.light) {
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_loadSavedThemeMode();
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}
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/// 从本地存储恢复上次保存的主题模式
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Future<void> _loadSavedThemeMode() async {
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try {
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final prefs = await SharedPreferences.getInstance();
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final saved = prefs.getString(_themeKey);
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emit(_parseThemeMode(saved));
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} catch (e) {
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emit(ThemeMode.light);
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}
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}
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/// 设置主题模式并持久化
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Future<void> setThemeMode(ThemeMode mode) async {
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try {
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final prefs = await SharedPreferences.getInstance();
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await prefs.setString(_themeKey, mode.name);
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emit(mode);
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} catch (e) {
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debugPrint('❌ [ThemeCubit] 保存主题设置失败: $e');
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}
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}
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/// 夜间模式开关（Switch 二态切换，不涉及跟随系统）
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Future<void> toggleDarkMode(bool enabled) =>
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setThemeMode(enabled ? ThemeMode.dark : ThemeMode.light);
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/// 当前是否为深色模式
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bool get isDarkMode => state == ThemeMode.dark;
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/// 将持久化的字符串解析为 ThemeMode
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ThemeMode _parseThemeMode(String? saved) {
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switch (saved) {
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case 'dark':
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return ThemeMode.dark;
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case 'system':
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return ThemeMode.system;
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default:
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return ThemeMode.light;
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}
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}
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}
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