84 lines
2.9 KiB
Dart
84 lines
2.9 KiB
Dart
import 'dart:ui' as ui;
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import 'package:aves/services/common/services.dart';
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import 'package:aves_report/aves_report.dart';
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import 'package:equatable/equatable.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/widgets.dart';
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class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
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final ThumbnailProviderKey key;
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ThumbnailProvider(this.key);
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@override
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Future<ThumbnailProviderKey> obtainKey(ImageConfiguration configuration) {
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// configuration can be empty (e.g. when obtaining key for eviction)
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// so we do not compute the target width/height here
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// and pass it to the key, to use it later for image loading
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return SynchronousFuture<ThumbnailProviderKey>(key);
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}
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@override
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ImageStreamCompleter loadImage(ThumbnailProviderKey key, ImageDecoderCallback 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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debugLabel: kReleaseMode ? null : [key.uri, key.extent].join('-'),
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informationCollector: () sync* {
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yield ErrorDescription('uri=${key.uri}, pageId=${key.pageId}, mimeType=${key.mimeType}, extent=${key.extent}');
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},
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);
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}
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Future<ui.Codec> _loadAsync(ThumbnailProviderKey key, ImageDecoderCallback decode) async {
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try {
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return await mediaFetchService.getThumbnail(
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decoded: false,
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request: key,
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decode: decode,
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taskKey: key,
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);
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} catch (error) {
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// loading may fail if the provided MIME type is incorrect (e.g. the Media Store may report a JPEG as a TIFF)
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debugPrint('$runtimeType _loadAsync failed for key=$key, error=$error');
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throw UnreportedStateError('thumbnail decoding failed for key=$key, error=$error');
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}
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}
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@override
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void resolveStreamForKey(ImageConfiguration configuration, ImageStream stream, ThumbnailProviderKey key, ImageErrorListener handleError) {
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mediaFetchService.resumeLoading(key);
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super.resolveStreamForKey(configuration, stream, key, handleError);
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}
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void pause() => mediaFetchService.cancelThumbnail(key);
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}
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@immutable
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class ThumbnailProviderKey extends Equatable {
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// do not store the entry as it is, because the key should be constant
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// but the entry attributes may change over time
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final String uri, mimeType;
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final int? pageId;
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final int rotationDegrees;
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final bool isFlipped;
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final int dateModifiedMillis;
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final double extent;
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@override
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List<Object?> get props => [uri, pageId, dateModifiedMillis, extent];
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const ThumbnailProviderKey({
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required this.uri,
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required this.mimeType,
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required this.pageId,
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required this.rotationDegrees,
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required this.isFlipped,
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required this.dateModifiedMillis,
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this.extent = 0,
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});
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@override
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String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, pageId=$pageId, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, dateModifiedMillis=$dateModifiedMillis, extent=$extent}';
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}
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