mobile-app/lib/app/themes.dart

import 'package:farm_tpf/utils/const_color.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

enum AppThemeStyle { light, dark }

final Map<AppThemeStyle, ThemeData> _themes = {
  AppThemeStyle.light: ThemeData(
    primaryColor: Colors.green,
    accentColor: Colors.green,
    brightness: Brightness.light,
  ),
  AppThemeStyle.dark: ThemeData(
    primaryColor: Colors.blue,
    accentColor: Colors.blue,
    brightness: Brightness.dark,
  ),
};

class AppTheme extends ChangeNotifier {
  static AppTheme of(BuildContext context, {bool listen = false}) =>
      Provider.of<AppTheme>(context, listen: listen);

  AppThemeStyle _themeKey = AppThemeStyle.light;

  ThemeData get currentTheme => _themes[_themeKey];
  AppThemeStyle get currentThemeKey => _themeKey;

  void setTheme(AppThemeStyle themeKey) {
    _themeKey = themeKey;
    notifyListeners();
  }

  void switchTheme() {
    if (_themeKey == AppThemeStyle.dark) {
      _themeKey = AppThemeStyle.light;
    } else {
      _themeKey = AppThemeStyle.dark;
    }
    notifyListeners();
  }
}