41 lines
1.1 KiB
Dart
41 lines
1.1 KiB
Dart
import 'package:photos/models/photo.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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class FavoritePhotosRepository {
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static final _favoritePhotoIdsKey = "favorite_photo_ids";
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FavoritePhotosRepository._privateConstructor();
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static FavoritePhotosRepository instance =
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FavoritePhotosRepository._privateConstructor();
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SharedPreferences _preferences;
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Future<void> init() async {
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_preferences = await SharedPreferences.getInstance();
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}
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bool isLiked(Photo photo) {
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return _getLiked().contains(photo.generatedId.toString());
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}
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Future<bool> setLiked(Photo photo, bool isLiked) {
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final liked = _getLiked();
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if (isLiked) {
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liked.add(photo.generatedId.toString());
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} else {
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liked.remove(photo.generatedId.toString());
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}
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return _preferences
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.setStringList(_favoritePhotoIdsKey, liked.toList())
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.then((_) => isLiked);
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}
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Set<String> _getLiked() {
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final value = _preferences.getStringList(_favoritePhotoIdsKey);
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if (value == null) {
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return Set<String>();
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} else {
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return value.toSet();
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}
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}
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}
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