52 lines
1.3 KiB
Dart
52 lines
1.3 KiB
Dart
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part of photogallery;
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/// Fetches the given image from the gallery.
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class PhotoProvider extends ImageProvider<PhotoProvider> {
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PhotoProvider({
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@required this.mediumId,
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}) : assert(mediumId != null);
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final String mediumId;
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@override
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ImageStreamCompleter load(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: $mediumId');
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},
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);
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}
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Future<ui.Codec> _loadAsync(PhotoProvider key, DecoderCallback decode) async {
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assert(key == this);
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final file = await PhotoGallery.getFile(
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mediumId: mediumId, mediumType: MediumType.image);
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if (file == null) return null;
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final bytes = await file.readAsBytes();
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if (bytes.lengthInBytes == 0) return null;
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return await decode(bytes);
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}
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@override
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Future<PhotoProvider> obtainKey(ImageConfiguration configuration) {
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return SynchronousFuture<PhotoProvider>(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 PhotoProvider typedOther = other;
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return mediumId == typedOther.mediumId;
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}
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@override
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int get hashCode => mediumId?.hashCode ?? 0;
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@override
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String toString() => '$runtimeType("$mediumId")';
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}
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