demo/xinhuaribao/lib/provider/global_theme_provider.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../util/shared_prefs_instance_util.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/9 16:00
/// @description:
class GlobalThemeNotifier extends Notifier<ThemeMode> {
  @override
  ThemeMode build() {
    _loadTheme();
    return ThemeMode.light; // 初始值
  }

  void _loadTheme() async {
    final isDark = await getIsDark() ?? false;
    state = isDark ? ThemeMode.dark : ThemeMode.light;
  }

  /// 切换白天/黑夜模式
  void toggleTheme(bool isDark) async {
    state = isDark ? ThemeMode.dark : ThemeMode.light;
    await saveIsDark(isDark);
  }

  // App 跟随系统主题自动切换
  void setSystemTheme() {
    state = ThemeMode.system;
  }
}