66 lines
1.7 KiB
Dart
66 lines
1.7 KiB
Dart
part of photogallery;
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/// Fetches the given album thumbnail from the gallery.
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class AlbumThumbnailProvider extends ImageProvider<AlbumThumbnailProvider> {
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const AlbumThumbnailProvider({
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required this.albumId,
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this.mediumType,
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this.height,
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this.width,
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this.highQuality = false,
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});
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final String albumId;
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final MediumType? mediumType;
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final int? height;
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final int? width;
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final bool? highQuality;
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@override
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ImageStreamCompleter loadBuffer(key, decode) {
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return MultiFrameImageStreamCompleter(
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codec: _loadAsync(key, decode),
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scale: 1.0,
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informationCollector: () sync* {
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yield ErrorDescription('Id: $albumId');
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},
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);
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}
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Future<ui.Codec> _loadAsync(AlbumThumbnailProvider key, DecoderBufferCallback decode) async {
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assert(key == this);
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final data = await PhotoGallery.getAlbumThumbnail(
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albumId: albumId,
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mediumType: mediumType,
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height: height,
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width: width,
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highQuality: highQuality,
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);
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ui.ImmutableBuffer buffer;
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if (data != null) {
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buffer = await ui.ImmutableBuffer.fromUint8List(Uint8List.fromList(data));
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} else {
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buffer = await ui.ImmutableBuffer.fromAsset("packages/photo_gallery/images/grey.bmp");
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}
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return decode(buffer);
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}
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@override
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Future<AlbumThumbnailProvider> obtainKey(ImageConfiguration configuration) {
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return SynchronousFuture<AlbumThumbnailProvider>(this);
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}
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@override
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bool operator ==(dynamic other) {
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if (other.runtimeType != runtimeType) return false;
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final AlbumThumbnailProvider typedOther = other;
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return albumId == typedOther.albumId;
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}
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@override
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int get hashCode => albumId.hashCode;
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@override
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String toString() => '$runtimeType("$albumId")';
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}
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