theme_cubit.dart

Go to the documentation of this file.

import 'package:flutter/material.dart';
import 'package:equatable/equatable.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:shared_preferences/shared_preferences.dart';
 
class ThemeModeState extends Equatable {
  final ThemeMode themeMode;
 
  const ThemeModeState({required this.themeMode});
 
  @override
  List<Object?> get props => [themeMode];
}
 
// theme_mode_event.dart
abstract class ThemeModeEvent extends Equatable {
  const ThemeModeEvent();
 
  @override
  List<Object?> get props => [];
}
 
class LoadThemeMode extends ThemeModeEvent {}
 
class ChangeThemeMode extends ThemeModeEvent {
  final ThemeMode themeMode;
 
  const ChangeThemeMode(this.themeMode);
 
  @override
  List<Object?> get props => [themeMode];
}
 
class ThemeModeBloc extends Bloc<ThemeModeEvent, ThemeModeState> {
  static const String _themeModeKey = 'theme_mode';
 
  ThemeModeBloc() : super(const ThemeModeState(themeMode: ThemeMode.system)) {
    on<LoadThemeMode>(_onLoadThemeMode);
    on<ChangeThemeMode>(_onChangeThemeMode);
  }
 
  Future<void> _onLoadThemeMode(
    LoadThemeMode event,
    Emitter<ThemeModeState> emit,
  ) async {
    final prefs = await SharedPreferences.getInstance();
    final savedThemeMode = prefs.getString(_themeModeKey);
    if (savedThemeMode == null) {
      emit(const ThemeModeState(themeMode: ThemeMode.system));
      return;
    }
 
    final themeMode = _getThemeModeFromString(savedThemeMode);
    emit(ThemeModeState(themeMode: themeMode));
  }
 
  Future<void> _onChangeThemeMode(
    ChangeThemeMode event,
    Emitter<ThemeModeState> emit,
  ) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString(_themeModeKey, event.themeMode.toString());
    emit(ThemeModeState(themeMode: event.themeMode));
  }
 
  ThemeMode _getThemeModeFromString(String themeModeString) {
    switch (themeModeString) {
      case 'ThemeMode.light':
        return ThemeMode.light;
      case 'ThemeMode.dark':
        return ThemeMode.dark;
      default:
        return ThemeMode.system;
    }
  }
}