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refactor: Try to display image #2771
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| export 'cubit/chat_room_cubit.dart'; | ||
| export 'matrix_chat/matrix_chat.dart'; | ||
| export 'view/chat_room_view.dart'; | ||
| export 'widget/mxc_image.dart'; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,188 @@ | ||
| import 'dart:typed_data'; | ||
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| import 'package:flutter/material.dart'; | ||
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| import 'package:http/http.dart' as http; | ||
| import 'package:matrix/matrix.dart'; | ||
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| class MxcImage extends StatefulWidget { | ||
| const MxcImage({ | ||
| required this.client, | ||
| this.uri, | ||
| this.event, | ||
| this.width, | ||
| this.height, | ||
| this.fit, | ||
| this.placeholder, | ||
| this.isThumbnail = true, | ||
| this.animated = false, | ||
| this.animationDuration = const Duration(milliseconds: 250), | ||
| this.retryDuration = const Duration(seconds: 2), | ||
| this.animationCurve = Curves.easeInOut, | ||
| this.thumbnailMethod = ThumbnailMethod.scale, | ||
| this.cacheKey, | ||
| super.key, | ||
| }); | ||
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| final Uri? uri; | ||
| final Event? event; | ||
| final double? width; | ||
| final double? height; | ||
| final BoxFit? fit; | ||
| final bool isThumbnail; | ||
| final bool animated; | ||
| final Duration retryDuration; | ||
| final Duration animationDuration; | ||
| final Curve animationCurve; | ||
| final ThumbnailMethod thumbnailMethod; | ||
| final Widget Function(BuildContext context)? placeholder; | ||
| final String? cacheKey; | ||
| final Client client; | ||
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| @override | ||
| State<MxcImage> createState() => _MxcImageState(); | ||
| } | ||
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| class _MxcImageState extends State<MxcImage> { | ||
| static final Map<String, Uint8List> _imageDataCache = {}; | ||
| Uint8List? _imageDataNoCache; | ||
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| Uint8List? get _imageData => widget.cacheKey == null | ||
| ? _imageDataNoCache | ||
| : _imageDataCache[widget.cacheKey]; | ||
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| set _imageData(Uint8List? data) { | ||
| if (data == null) return; | ||
| final cacheKey = widget.cacheKey; | ||
| cacheKey == null | ||
| ? _imageDataNoCache = data | ||
| : _imageDataCache[cacheKey] = data; | ||
| } | ||
|
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| bool? _isCached; | ||
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| Future<void> _load() async { | ||
| final uri = widget.uri; | ||
| final event = widget.event; | ||
|
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| if (uri != null) { | ||
| final devicePixelRatio = MediaQuery.of(context).devicePixelRatio; | ||
| final width = widget.width; | ||
| final realWidth = width == null ? null : width * devicePixelRatio; | ||
| final height = widget.height; | ||
| final realHeight = height == null ? null : height * devicePixelRatio; | ||
|
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| final httpUri = widget.isThumbnail | ||
| ? uri.getThumbnail( | ||
| widget.client, | ||
| width: realWidth, | ||
| height: realHeight, | ||
| animated: widget.animated, | ||
| method: widget.thumbnailMethod, | ||
| ) | ||
| : uri.getDownloadLink(widget.client); | ||
|
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| final storeKey = widget.isThumbnail ? httpUri : uri; | ||
|
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| if (_isCached == null) { | ||
| final cachedData = await widget.client.database?.getFile(storeKey); | ||
| if (cachedData != null) { | ||
| if (!mounted) return; | ||
| setState(() { | ||
| _imageData = cachedData; | ||
| _isCached = true; | ||
| }); | ||
| return; | ||
| } | ||
| _isCached = false; | ||
| } | ||
|
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| final response = await http.get(httpUri); | ||
| if (response.statusCode != 200) { | ||
| if (response.statusCode == 404) { | ||
| return; | ||
| } | ||
| throw Exception(); | ||
| } | ||
| final remoteData = response.bodyBytes; | ||
|
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| if (!mounted) return; | ||
| setState(() { | ||
| _imageData = remoteData; | ||
| }); | ||
| await widget.client.database?.storeFile(storeKey, remoteData, 0); | ||
| } | ||
|
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| if (event != null) { | ||
| final data = await event.downloadAndDecryptAttachment( | ||
| getThumbnail: widget.isThumbnail, | ||
| ); | ||
| if (data.msgType == MessageTypes.Image) { | ||
| if (!mounted) return; | ||
| setState(() { | ||
| _imageData = data.bytes; | ||
| }); | ||
| return; | ||
| } | ||
| } | ||
| } | ||
|
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| void _tryLoad(_) async { | ||
| if (_imageData != null) { | ||
| return; | ||
| } | ||
| try { | ||
| await _load(); | ||
| } catch (_) { | ||
| if (!mounted) return; | ||
| await Future<void>.delayed(widget.retryDuration); | ||
| _tryLoad(_); | ||
| } | ||
| } | ||
|
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
| WidgetsBinding.instance.addPostFrameCallback(_tryLoad); | ||
| } | ||
|
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| Widget placeholder(BuildContext context) => | ||
| widget.placeholder?.call(context) ?? | ||
| Container( | ||
| width: widget.width, | ||
| height: widget.height, | ||
| alignment: Alignment.center, | ||
| child: const CircularProgressIndicator.adaptive(strokeWidth: 2), | ||
| ); | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| final data = _imageData; | ||
| final hasData = data != null && data.isNotEmpty; | ||
|
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| return AnimatedCrossFade( | ||
| crossFadeState: | ||
| hasData ? CrossFadeState.showSecond : CrossFadeState.showFirst, | ||
| duration: const Duration(milliseconds: 250), | ||
| firstChild: placeholder(context), | ||
| secondChild: hasData | ||
| ? Image.memory( | ||
| data, | ||
| width: widget.width, | ||
| height: widget.height, | ||
| fit: widget.fit, | ||
| filterQuality: FilterQuality.none, | ||
| errorBuilder: (context, __, s) { | ||
| _isCached = false; | ||
| _imageData = null; | ||
| WidgetsBinding.instance.addPostFrameCallback(_tryLoad); | ||
| return placeholder(context); | ||
| }, | ||
| ) | ||
| : SizedBox( | ||
| width: widget.width, | ||
| height: widget.height, | ||
| ), | ||
| ); | ||
| } | ||
| } |