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immich/mobile/lib/modules/favorite/providers/favorite_provider.dart

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import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:immich_mobile/shared/models/asset.dart';
import 'package:immich_mobile/shared/providers/asset.provider.dart';
class FavoriteSelectionNotifier extends StateNotifier<Set<String>> {
FavoriteSelectionNotifier(this.assetsState, this.assetNotifier) : super({}) {
state = assetsState.allAssets
.where((asset) => asset.isFavorite)
.map((asset) => asset.id)
.toSet();
}
final AssetsState assetsState;
final AssetNotifier assetNotifier;
void _setFavoriteForAssetId(String id, bool favorite) {
if (!favorite) {
state = state.difference({id});
} else {
state = state.union({id});
}
}
bool _isFavorite(String id) {
return state.contains(id);
}
Future<void> toggleFavorite(Asset asset) async {
if (!asset.isRemote) return; // TODO support local favorite assets
_setFavoriteForAssetId(asset.id, !_isFavorite(asset.id));
await assetNotifier.toggleFavorite(
asset,
state.contains(asset.id),
);
}
Future<void> addToFavorites(Iterable<Asset> assets) {
state = state.union(assets.map((a) => a.id).toSet());
final futures = assets.map((a) =>
assetNotifier.toggleFavorite(
a,
true,
),
);
return Future.wait(futures);
}
}
final favoriteProvider =
StateNotifierProvider<FavoriteSelectionNotifier, Set<String>>((ref) {
return FavoriteSelectionNotifier(
ref.watch(assetProvider),
ref.watch(assetProvider.notifier),
);
});
final favoriteAssetProvider = StateProvider((ref) {
final favorites = ref.watch(favoriteProvider);
return ref
.watch(assetProvider)
.allAssets
.where((element) => favorites.contains(element.id))
.toList();
});