76 lines
2.2 KiB
Dart
76 lines
2.2 KiB
Dart
import 'dart:async';
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import 'dart:typed_data';
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import 'dart:ui' as ui show Codec;
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import 'package:aves/services/image_file_service.dart';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:pedantic/pedantic.dart';
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class UriImage extends ImageProvider<UriImage> {
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const UriImage({
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@required this.uri,
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@required this.mimeType,
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@required this.orientationDegrees,
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this.expectedContentLength,
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this.scale = 1.0,
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}) : assert(uri != null),
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assert(scale != null);
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final String uri, mimeType;
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final int orientationDegrees, expectedContentLength;
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final double scale;
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@override
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Future<UriImage> obtainKey(ImageConfiguration configuration) {
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return SynchronousFuture<UriImage>(this);
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}
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@override
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ImageStreamCompleter load(UriImage key, DecoderCallback decode) {
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final chunkEvents = StreamController<ImageChunkEvent>();
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return MultiFrameImageStreamCompleter(
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codec: _loadAsync(key, decode, chunkEvents),
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scale: key.scale,
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chunkEvents: chunkEvents.stream,
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informationCollector: () sync* {
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yield ErrorDescription('uri=$uri, mimeType=$mimeType');
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},
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);
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}
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Future<ui.Codec> _loadAsync(UriImage key, DecoderCallback decode, StreamController<ImageChunkEvent> chunkEvents) async {
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assert(key == this);
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try {
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final bytes = await ImageFileService.getImage(
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uri,
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mimeType,
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orientationDegrees: orientationDegrees,
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expectedContentLength: expectedContentLength,
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onBytesReceived: (cumulative, total) {
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chunkEvents.add(ImageChunkEvent(
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cumulativeBytesLoaded: cumulative,
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expectedTotalBytes: total,
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));
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},
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);
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return await decode(bytes ?? Uint8List(0));
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} finally {
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unawaited(chunkEvents.close());
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}
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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 UriImage && other.uri == uri && other.mimeType == mimeType && other.scale == scale;
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}
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@override
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int get hashCode => hashValues(uri, scale);
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@override
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String toString() => '${objectRuntimeType(this, 'UriImage')}(uri=$uri, mimeType=$mimeType, scale=$scale)';
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}
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