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samples/veggieseasons/lib/data/app_state.dart

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// Copyright 2018 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'package:flutter/foundation.dart';
import 'local_veggie_provider.dart';
import 'veggie.dart';
class AppState extends ChangeNotifier {
final List<Veggie> _veggies;
AppState() : _veggies = LocalVeggieProvider.veggies;
List<Veggie> get allVeggies => List<Veggie>.from(_veggies);
List<Veggie> get availableVeggies {
var currentSeason = _getSeasonForDate(DateTime.now());
return _veggies.where((v) => v.seasons.contains(currentSeason)).toList();
}
List<Veggie> get favoriteVeggies =>
_veggies.where((v) => v.isFavorite).toList();
List<Veggie> get unavailableVeggies {
var currentSeason = _getSeasonForDate(DateTime.now());
return _veggies.where((v) => !v.seasons.contains(currentSeason)).toList();
}
Veggie getVeggie(int? id) => _veggies.singleWhere((v) => v.id == id);
List<Veggie> searchVeggies(String? terms) => _veggies
.where((v) => v.name.toLowerCase().contains(terms!.toLowerCase()))
.toList();
void setFavorite(int? id, bool isFavorite) {
var veggie = getVeggie(id);
veggie.isFavorite = isFavorite;
notifyListeners();
}
/// Used in tests to set the season independent of the current date.
static Season? debugCurrentSeason;
static Season? _getSeasonForDate(DateTime date) {
if (debugCurrentSeason != null) {
return debugCurrentSeason;
}
// Technically the start and end dates of seasons can vary by a day or so,
// but this is close enough for produce.
switch (date.month) {
case 1:
return Season.winter;
case 2:
return Season.winter;
case 3:
return date.day < 21 ? Season.winter : Season.spring;
case 4:
return Season.spring;
case 5:
return Season.spring;
case 6:
return date.day < 21 ? Season.spring : Season.summer;
case 7:
return Season.summer;
case 8:
return Season.summer;
case 9:
return date.day < 22 ? Season.autumn : Season.winter;
case 10:
return Season.autumn;
case 11:
return Season.autumn;
case 12:
return date.day < 22 ? Season.autumn : Season.winter;
default:
throw ArgumentError('Can\'t return a season for month #${date.month}.');
}
}
}