flutter_provider_demo/lib/provider/car_provider.dart

import 'dart:collection';

import 'package:flutter/material.dart';
import 'package:flutter_provider_demo/dao/car_dao.dart';
import 'package:flutter_provider_demo/model/car_model.dart';

/// Description: car provider
/// Time       : 09/04/2023 Monday
/// Author     : liuyuqi.gov@msn.cn
class CarProvider extends ChangeNotifier {
  late List<CarModel> _cars;
  int _count = 0;

  int get count => _count;
  UnmodifiableListView<CarModel> get allCars => UnmodifiableListView(_cars);

  UnmodifiableListView<CarModel> get unStartedCars =>
      UnmodifiableListView(_cars.where((car) => car.start == false));

  UnmodifiableListView<CarModel> get startedCars =>
      UnmodifiableListView(_cars.where((car) => car.start == true));

  Future<List<CarModel>> getCars() async {
    _cars = await CarDao.getCars();
    notifyListeners();
    return _cars;
  }

  void deleteCar(BuildContext context, CarModel car) async {
    await CarDao.deleteCar(car);
    _cars.remove(car);
    notifyListeners();
  }

  /// add car
  void addCar(CarModel car) async {
    final id = await CarDao.addCar(car);
    if (id > 0) {
      _cars.add(car);
      notifyListeners();
    }
  }

  void _showSnackBar(BuildContext context, String message) {
    final snackBar = SnackBar(
      duration: const Duration(milliseconds: 500),
      content: Text(
        message,
        style: const TextStyle(color: Colors.white),
      ),
      backgroundColor: Theme.of(context).primaryColor,
    );
    ScaffoldMessenger.of(context).showSnackBar(snackBar);
  }

  void startCar(BuildContext context, CarModel car) {
    notifyListeners();
  }
}