新增夜间模式相关代码

2026-10-11 15:44:44 +08:00
parent 2512f88f30
commit 1d033670f7
4 changed files with 317 additions and 51 deletions
@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class ThemeService {
+  static const _prefKey = 'theme_mode';
+  static final ValueNotifier<ThemeMode> notifier = ValueNotifier(
+    ThemeMode.system,
+  );
+
+  /// 启动时调用（main.dart）
+  static Future<void> init() async {
+    final prefs = await SharedPreferences.getInstance();
+    final saved = prefs.getString(_prefKey);
+    notifier.value = _parse(saved);
+  }
+
+  /// 菜单里调用
+  static Future<void> setMode(ThemeMode mode) async {
+    notifier.value = mode;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_prefKey, _name(mode));
+  }
+
+  static ThemeMode _parse(String? s) {
+    switch (s) {
+      case 'light':
+        return ThemeMode.light;
+      case 'dark':
+        return ThemeMode.dark;
+      default:
+        return ThemeMode.system;
+    }
+  }
+
+  static String _name(ThemeMode m) {
+    switch (m) {
+      case ThemeMode.light:
+        return 'light';
+      case ThemeMode.dark:
+        return 'dark';
+      case ThemeMode.system:
+        return 'system';
+    }
+  }
+}