101 lines
3.3 KiB
Dart
101 lines
3.3 KiB
Dart
import 'dart:ui' as ui show Codec;
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import 'package:aves/services/services.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 load(ThumbnailProviderKey key, DecoderCallback 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('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, DecoderCallback decode) async {
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final uri = key.uri;
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final mimeType = key.mimeType;
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final pageId = key.pageId;
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try {
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final bytes = await imageFileService.getThumbnail(
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uri: uri,
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mimeType: mimeType,
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pageId: pageId,
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rotationDegrees: key.rotationDegrees,
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isFlipped: key.isFlipped,
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dateModifiedSecs: key.dateModifiedSecs,
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extent: key.extent,
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taskKey: key,
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);
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if (bytes.isEmpty) {
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throw StateError('$uri ($mimeType) loading failed');
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}
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return await decode(bytes);
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} catch (error) {
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debugPrint('$runtimeType _loadAsync failed with uri=$uri, error=$error');
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throw StateError('$mimeType decoding failed (page $pageId)');
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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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imageFileService.resumeLoading(key);
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super.resolveStreamForKey(configuration, stream, key, handleError);
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}
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void pause() => imageFileService.cancelThumbnail(key);
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}
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class ThumbnailProviderKey {
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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 dateModifiedSecs;
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final double 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.dateModifiedSecs,
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this.extent = 0,
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});
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@override
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bool operator ==(Object other) {
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if (other.runtimeType != runtimeType) return false;
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return other is ThumbnailProviderKey && other.uri == uri && other.pageId == pageId && other.dateModifiedSecs == dateModifiedSecs && other.extent == extent;
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}
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@override
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int get hashCode => hashValues(
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uri,
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pageId,
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dateModifiedSecs,
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extent,
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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, dateModifiedSecs=$dateModifiedSecs, extent=$extent}';
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}
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