fluffychat/lib/views/widgets/image_bubble.dart
2021-04-09 16:15:03 +02:00

270 lines
8.0 KiB
Dart

import 'package:famedlysdk/famedlysdk.dart';
import 'package:fluffychat/views/image_view.dart';
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_blurhash/flutter_blurhash.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter_svg/flutter_svg.dart';
import '../../utils/event_extension.dart';
class ImageBubble extends StatefulWidget {
final Event event;
final bool tapToView;
final BoxFit fit;
final bool maxSize;
final Color backgroundColor;
final double radius;
final bool thumbnailOnly;
final void Function() onLoaded;
const ImageBubble(
this.event, {
this.tapToView = true,
this.maxSize = true,
this.backgroundColor,
this.fit = BoxFit.cover,
this.radius = 10.0,
this.thumbnailOnly = true,
this.onLoaded,
Key key,
}) : super(key: key);
@override
_ImageBubbleState createState() => _ImageBubbleState();
}
class _ImageBubbleState extends State<ImageBubble> {
String thumbnailUrl;
String attachmentUrl;
MatrixFile _file;
MatrixFile _thumbnail;
bool _requestedThumbnailOnFailure = false;
bool get isSvg =>
widget.event.attachmentMimetype.split('+').first == 'image/svg';
bool get isThumbnailSvg =>
widget.event.thumbnailMimetype.split('+').first == 'image/svg';
MatrixFile get _displayFile => _file ?? _thumbnail;
String get displayUrl => widget.thumbnailOnly ? thumbnailUrl : attachmentUrl;
dynamic _error;
Future<void> _requestFile({bool getThumbnail = false}) async {
try {
final res = await widget.event
.downloadAndDecryptAttachmentCached(getThumbnail: getThumbnail);
WidgetsBinding.instance.addPostFrameCallback((_) {
if (getThumbnail) {
if (mounted) {
setState(() => _thumbnail = res);
}
} else {
if (widget.onLoaded != null) {
widget.onLoaded();
}
if (mounted) {
setState(() => _file = res);
}
}
});
} catch (err) {
WidgetsBinding.instance.addPostFrameCallback((_) {
if (mounted) {
setState(() => _error = err);
}
});
}
}
@override
void initState() {
thumbnailUrl =
widget.event.getAttachmentUrl(getThumbnail: true, animated: true);
attachmentUrl = widget.event.getAttachmentUrl(animated: true);
if (thumbnailUrl == null) {
_requestFile(getThumbnail: true);
}
if (!widget.thumbnailOnly && attachmentUrl == null) {
_requestFile();
} else {
// if the full attachment is cached, we might as well fetch it anyways.
// no need to stick with thumbnail only, since we don't do any networking
widget.event.isAttachmentCached().then((cached) {
if (cached) {
_requestFile();
}
});
}
super.initState();
}
Widget getErrorWidget() {
return Center(
child: Text(
_error.toString(),
),
);
}
Widget getPlaceholderWidget() {
Widget blurhash;
if (widget.event.infoMap['xyz.amorgan.blurhash'] is String) {
final ratio =
widget.event.infoMap['w'] is int && widget.event.infoMap['h'] is int
? widget.event.infoMap['w'] / widget.event.infoMap['h']
: 1.0;
var width = 32;
var height = 32;
if (ratio > 1.0) {
height = (width / ratio).round();
} else {
width = (height * ratio).round();
}
blurhash = BlurHash(
hash: widget.event.infoMap['xyz.amorgan.blurhash'],
decodingWidth: width,
decodingHeight: height,
imageFit: widget.fit,
);
}
return Stack(
children: <Widget>[
if (blurhash != null) blurhash,
Center(
child: CircularProgressIndicator(),
),
],
);
}
Widget getMemoryWidget() {
final isOriginal = _file != null ||
widget.event.attachmentOrThumbnailMxcUrl(getThumbnail: true) ==
widget.event.attachmentMxcUrl;
final key = isOriginal
? widget.event.attachmentMxcUrl
: widget.event.thumbnailMxcUrl;
if (isOriginal ? isSvg : isThumbnailSvg) {
return SvgPicture.memory(
_displayFile.bytes,
key: ValueKey(key),
fit: widget.fit,
);
} else {
return Image.memory(
_displayFile.bytes,
key: ValueKey(key),
fit: widget.fit,
);
}
}
Widget getNetworkWidget() {
if (displayUrl == attachmentUrl &&
(_requestedThumbnailOnFailure ? isSvg : isThumbnailSvg)) {
return SvgPicture.network(
displayUrl,
key: ValueKey(displayUrl),
placeholderBuilder: (context) => getPlaceholderWidget(),
fit: widget.fit,
);
} else {
return CachedNetworkImage(
// as we change the url on-error we need a key so that the widget actually updates
key: ValueKey(displayUrl),
imageUrl: displayUrl,
placeholder: (context, url) {
if (!widget.thumbnailOnly &&
displayUrl != thumbnailUrl &&
displayUrl == attachmentUrl) {
// we have to display the thumbnail while loading
return CachedNetworkImage(
key: ValueKey(thumbnailUrl),
imageUrl: thumbnailUrl,
placeholder: (c, u) => getPlaceholderWidget(),
fit: widget.fit,
);
}
return getPlaceholderWidget();
},
errorWidget: (context, url, error) {
// we can re-request the thumbnail
if (!_requestedThumbnailOnFailure) {
_requestedThumbnailOnFailure = true;
WidgetsBinding.instance.addPostFrameCallback((_) {
setState(() {
thumbnailUrl = widget.event.getAttachmentUrl(
getThumbnail: true,
useThumbnailMxcUrl: true,
animated: true);
attachmentUrl = widget.event
.getAttachmentUrl(useThumbnailMxcUrl: true, animated: true);
});
});
}
return getPlaceholderWidget();
},
fit: widget.fit,
);
}
}
@override
Widget build(BuildContext context) {
Widget content;
String key;
if (_error != null) {
content = getErrorWidget();
key = 'error';
} else if (_displayFile != null) {
content = getMemoryWidget();
key = 'memory-' + (content.key as ValueKey).value;
} else if (displayUrl != null) {
content = getNetworkWidget();
key = 'network-' + (content.key as ValueKey).value;
} else {
content = getPlaceholderWidget();
key = 'placeholder';
}
return ClipRRect(
borderRadius: BorderRadius.circular(widget.radius),
child: InkWell(
onTap: () {
if (!widget.tapToView) return;
Navigator.of(context, rootNavigator: false).push(
MaterialPageRoute(
builder: (_) => ImageView(widget.event, onLoaded: () {
// If the original file didn't load yet, we want to do that now.
// This is so that the original file displays after going on the image viewer,
// waiting for it to load, and then hitting back. This ensures that we always
// display the best image available, with requiring as little network as possible
if (_file == null) {
widget.event.isAttachmentCached().then((cached) {
if (cached) {
_requestFile();
}
});
}
}),
),
);
},
child: Hero(
tag: widget.event.eventId,
child: AnimatedSwitcher(
duration: Duration(milliseconds: 1000),
child: Container(
key: ValueKey(key),
height: widget.maxSize ? 300 : null,
width: widget.maxSize ? 400 : null,
child: content,
),
),
),
),
);
}
}