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## Pre-launch Checklist - [x] I read the [Flutter Style Guide] _recently_, and have followed its advice. - [x] I signed the [CLA]. - [x] I read the [Contributors Guide]. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-devrel channel on [Discord]. <!-- Links --> [Flutter Style Guide]: https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md [CLA]: https://cla.developers.google.com/ [Discord]: https://github.com/flutter/flutter/blob/master/docs/contributing/Chat.md [Contributors Guide]: https://github.com/flutter/samples/blob/main/CONTRIBUTING.md
89 lines
2.6 KiB
Dart
89 lines
2.6 KiB
Dart
// Copyright 2018 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:async';
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import 'package:flutter/cupertino.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'veggie.dart';
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/// A model class that mirrors the options in [SettingsScreen] and stores data
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/// in shared preferences.
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class Preferences extends ChangeNotifier {
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// Keys to use with shared preferences.
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static const _caloriesKey = 'calories';
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static const _preferredCategoriesKey = 'preferredCategories';
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// Indicates whether a call to [_loadFromSharedPrefs] is in progress;
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Future<void>? _loading;
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int _desiredCalories = 2000;
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final Set<VeggieCategory> _preferredCategories = <VeggieCategory>{};
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Future<int> get desiredCalories async {
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await _loading;
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return _desiredCalories;
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}
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Future<Set<VeggieCategory>> get preferredCategories async {
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await _loading;
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return Set.from(_preferredCategories);
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}
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Future<void> addPreferredCategory(VeggieCategory category) async {
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_preferredCategories.add(category);
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await _saveToSharedPrefs();
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notifyListeners();
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}
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Future<void> removePreferredCategory(VeggieCategory category) async {
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_preferredCategories.remove(category);
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await _saveToSharedPrefs();
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notifyListeners();
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}
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Future<void> setDesiredCalories(int calories) async {
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_desiredCalories = calories;
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await _saveToSharedPrefs();
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notifyListeners();
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}
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Future<void> restoreDefaults() async {
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final prefs = await SharedPreferences.getInstance();
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await prefs.clear();
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load();
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}
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void load() {
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_loading = _loadFromSharedPrefs();
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}
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Future<void> _saveToSharedPrefs() async {
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final prefs = await SharedPreferences.getInstance();
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await prefs.setInt(_caloriesKey, _desiredCalories);
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// Store preferred categories as a comma-separated string containing their
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// indices.
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await prefs.setString(_preferredCategoriesKey,
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_preferredCategories.map((c) => c.index.toString()).join(','));
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}
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Future<void> _loadFromSharedPrefs() async {
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final prefs = await SharedPreferences.getInstance();
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_desiredCalories = prefs.getInt(_caloriesKey) ?? 2000;
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_preferredCategories.clear();
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final names = prefs.getString(_preferredCategoriesKey);
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if (names != null && names.isNotEmpty) {
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for (final name in names.split(',')) {
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final index = int.tryParse(name) ?? -1;
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_preferredCategories.add(VeggieCategory.values[index]);
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}
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}
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notifyListeners();
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}
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}
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