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feat: Error handling enhancement from flutter_svg
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- copy from this PR: dnfield/flutter_svg#1104
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@minhhung2556
minhhung2556 committed Nov 4, 2024
1 parent b16f8c8 commit febf263
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Showing 5 changed files with 316 additions and 79 deletions.
1 change: 1 addition & 0 deletions third_party/packages/flutter_svg/example/assets/invalid.svg
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158 changes: 103 additions & 55 deletions third_party/packages/flutter_svg/example/lib/grid.dart
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Original file line number Diff line number Diff line change
@@ -1,8 +1,11 @@
import 'dart:math';

import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';

const List<String> _assetNames = <String>[
// 'assets/notfound.svg', // uncomment to test an asset that doesn't exist.
'assets/invalid.svg',
'assets/notfound.svg', // uncomment to test an asset that doesn't exist.
'assets/flutter_logo.svg',
'assets/dart.svg',
'assets/simple/clip_path_3.svg',
Expand Down Expand Up @@ -35,7 +38,7 @@ const List<String> _assetNames = <String>[
];

/// Assets treated as "icons" - using a color filter to render differently.
const List<String> iconNames = <String>[
const List<String> _iconNames = <String>[
'assets/deborah_ufw/new-action-expander.svg',
'assets/deborah_ufw/new-camera.svg',
'assets/deborah_ufw/new-gif-button.svg',
Expand All @@ -49,12 +52,27 @@ const List<String> iconNames = <String>[
];

/// Assets to test network access.
const List<String> uriNames = <String>[
const List<String> _uriNames = <String>[
'http://upload.wikimedia.org/wikipedia/commons/0/02/SVG_logo.svg',
'https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/410.svg',
'https://upload.wikimedia.org/wikipedia/commons/b/b4/Chess_ndd45.svg',
];

const List<String> _uriFailedNames = <String>[
'an error image url.svg', // invalid url.
'https: /sadf.svg', // invalid url.
'http://www.google.com/404', // 404 url.
'https://picsum.photos/200', // wrong format image url.
];

const List<String> _stringNames = <String>[
'''<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <image xlink:href="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" height="200" width="200"/></svg>''', // Shows an example of an SVG image that will fetch a raster image from a URL.
'''<svg height="100" width="100" xmlns="http://www.w3.org/2000/svg"> <circle r="45" cx="50" cy="50" fill="red" /> </svg> ''', // valid svg
'''<svg></svg>''', // empty svg.
'sdf sdf ', // invalid svg.
'', // empty string.
];

void main() {
runApp(_MyApp());
}
Expand All @@ -81,59 +99,10 @@ class _MyHomePage extends StatefulWidget {
}

class _MyHomePageState extends State<_MyHomePage> {
final List<Widget> _painters = <Widget>[];
late double _dimension;

@override
void initState() {
super.initState();
_dimension = 203.0;
for (final String assetName in _assetNames) {
_painters.add(
SvgPicture.asset(assetName),
);
}

for (int i = 0; i < iconNames.length; i++) {
_painters.add(
Directionality(
textDirection: TextDirection.ltr,
child: SvgPicture.asset(
iconNames[i],
colorFilter: ColorFilter.mode(
Colors.blueGrey[(i + 1) * 100] ?? Colors.blueGrey,
BlendMode.srcIn,
),
matchTextDirection: true,
),
),
);
}

for (final String uriName in uriNames) {
_painters.add(
SvgPicture.network(
uriName,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
),
);
}
// Shows an example of an SVG image that will fetch a raster image from a URL.
_painters.add(SvgPicture.string('''
<svg viewBox="0 0 200 200"
xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<image xlink:href="https://mdn.mozillademos.org/files/6457/mdn_logo_only_color.png" height="200" width="200"/>
</svg>'''));
}
double _dimension = 60;

@override
Widget build(BuildContext context) {
if (_dimension > MediaQuery.of(context).size.width - 10.0) {
_dimension = MediaQuery.of(context).size.width - 10.0;
}
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
Expand All @@ -144,7 +113,7 @@ class _MyHomePageState extends State<_MyHomePage> {
max: MediaQuery.of(context).size.width - 10.0,
value: _dimension,
onChanged: (double val) {
setState(() => _dimension = val);
setState(() => _dimension = min(MediaQuery.of(context).size.width - 10.0, val));
},
),
Expanded(
Expand All @@ -154,7 +123,86 @@ class _MyHomePageState extends State<_MyHomePage> {
padding: const EdgeInsets.all(4.0),
mainAxisSpacing: 4.0,
crossAxisSpacing: 4.0,
children: _painters.toList(),
children: <Widget>[
..._assetNames.map(
(String e) => SvgPicture.asset(
e,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
errorBuilder: (BuildContext context, Object error, StackTrace stackTrace) => Container(
color: Colors.brown,
width: 10,
height: 10,
),
),
),
..._iconNames.map(
(String e) => Directionality(
textDirection: TextDirection.ltr,
child: SvgPicture.asset(
e,
colorFilter: ColorFilter.mode(
Colors.blueGrey[(_iconNames.indexOf(e) + 1) * 100] ?? Colors.blueGrey,
BlendMode.srcIn,
),
matchTextDirection: true,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
errorBuilder: (BuildContext context, Object error, StackTrace stackTrace) => Container(
color: Colors.yellow,
width: 10,
height: 10,
),
),
),
),
..._uriNames.map(
(String e) => SvgPicture.network(
e,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
errorBuilder: (BuildContext context, Object error, StackTrace stackTrace) => Container(
color: Colors.red,
width: 10,
height: 10,
),
),
),
..._uriFailedNames.map(
(String e) => SvgPicture.network(
e,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
errorBuilder: (BuildContext context, Object error, StackTrace stackTrace) => Container(
color: Colors.deepPurple,
width: 10,
height: 10,
),
),
),
..._stringNames.map(
(String e) => SvgPicture.string(
e,
placeholderBuilder: (BuildContext context) => Container(
padding: const EdgeInsets.all(30.0),
child: const CircularProgressIndicator(),
),
errorBuilder: (BuildContext context, Object error, StackTrace stackTrace) => Container(
color: Colors.pinkAccent,
width: 10,
height: 10,
),
),
),
],
),
),
]),
Expand Down
66 changes: 42 additions & 24 deletions third_party/packages/flutter_svg/lib/src/loaders.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -152,20 +152,29 @@ abstract class SvgLoader<T> extends BytesLoader {
final SvgTheme theme = getTheme(context);
return prepareMessage(context).then((T? message) {
return compute((T? message) {
return vg
.encodeSvg(
xml: provideSvg(message),
theme: theme.toVgTheme(),
colorMapper: colorMapper == null
? null
: _DelegateVgColorMapper(colorMapper!),
debugName: 'Svg loader',
enableClippingOptimizer: false,
enableMaskingOptimizer: false,
enableOverdrawOptimizer: false,
)
.buffer
.asByteData();
try {
debugPrint('SvgLoader._load.provideSvg: empty');
final String xml = provideSvg(message);
if (xml.isEmpty) {
return Future<ByteData>.value(ByteData(0));
} else {
return vg
.encodeSvg(
xml: xml,
theme: theme.toVgTheme(),
colorMapper: colorMapper == null ? null : _DelegateVgColorMapper(colorMapper!),
debugName: 'Svg loader',
enableClippingOptimizer: false,
enableMaskingOptimizer: false,
enableOverdrawOptimizer: false,
)
.buffer
.asByteData();
}
} catch (e) {
debugPrint('SvgLoader._load.error: $e');
return Future<ByteData>.value(ByteData(0));
}
}, message, debugLabel: 'Load Bytes');
});
}
Expand Down Expand Up @@ -373,15 +382,19 @@ class SvgAssetLoader extends SvgLoader<ByteData> {
}

@override
Future<ByteData?> prepareMessage(BuildContext? context) {
return _resolveBundle(context).load(
packageName == null ? assetName : 'packages/$packageName/$assetName',
);
Future<ByteData?> prepareMessage(BuildContext? context) async {
try {
return await _resolveBundle(context).load(
packageName == null ? assetName : 'packages/$packageName/$assetName',
);
} catch (e) {
debugPrint('SvgAssetLoader.prepareMessage.error: $e');
return Future<ByteData?>.value();
}
}

@override
String provideSvg(ByteData? message) =>
utf8.decode(message!.buffer.asUint8List(), allowMalformed: true);
String provideSvg(ByteData? message) => utf8.decode(message!.buffer.asUint8List(), allowMalformed: true);

@override
SvgCacheKey cacheKey(BuildContext? context) {
Expand Down Expand Up @@ -437,13 +450,18 @@ class SvgNetworkLoader extends SvgLoader<Uint8List> {

@override
Future<Uint8List?> prepareMessage(BuildContext? context) async {
final http.Client client = _httpClient ?? http.Client();
return (await client.get(Uri.parse(url), headers: headers)).bodyBytes;
try {
final http.Client client = _httpClient ?? http.Client();
final http.Response res = await client.get(Uri.parse(url), headers: headers);
return res.bodyBytes;
} catch (e) {
debugPrint('SvgNetworkLoader.prepareMessage.error: $e');
return null;
}
}

@override
String provideSvg(Uint8List? message) =>
utf8.decode(message!, allowMalformed: true);
String provideSvg(Uint8List? message) => message == null ? '' : utf8.decode(message, allowMalformed: true);

@override
int get hashCode => Object.hash(url, headers, theme, colorMapper);
Expand Down
18 changes: 18 additions & 0 deletions third_party/packages/flutter_svg/lib/svg.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -86,13 +86,15 @@ class SvgPicture extends StatelessWidget {
this.semanticsLabel,
this.excludeFromSemantics = false,
this.clipBehavior = Clip.hardEdge,
this.errorBuilder,
@Deprecated(
'No code should use this parameter. It never was implemented properly. '
'The SVG theme must be set on the bytesLoader.')
SvgTheme? theme,
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
});


/// Instantiates a widget that renders an SVG picture from an [AssetBundle].
///
/// The key will be derived from the `assetName`, `package`, and `bundle`
Expand Down Expand Up @@ -190,6 +192,7 @@ class SvgPicture extends StatelessWidget {
@Deprecated('Use colorFilter instead.')
ui.BlendMode colorBlendMode = ui.BlendMode.srcIn,
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
this.errorBuilder,
}) : bytesLoader = SvgAssetLoader(
assetName,
packageName: package,
Expand Down Expand Up @@ -251,6 +254,7 @@ class SvgPicture extends StatelessWidget {
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
SvgTheme? theme,
http.Client? httpClient,
this.errorBuilder,
}) : bytesLoader = SvgNetworkLoader(
url,
headers: headers,
Expand Down Expand Up @@ -308,6 +312,7 @@ class SvgPicture extends StatelessWidget {
this.clipBehavior = Clip.hardEdge,
SvgTheme? theme,
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
this.errorBuilder,
}) : bytesLoader = SvgFileLoader(file, theme: theme),
colorFilter = colorFilter ?? _getColorFilter(color, colorBlendMode);

Expand Down Expand Up @@ -357,6 +362,7 @@ class SvgPicture extends StatelessWidget {
this.clipBehavior = Clip.hardEdge,
SvgTheme? theme,
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
this.errorBuilder,
}) : bytesLoader = SvgBytesLoader(bytes, theme: theme),
colorFilter = colorFilter ?? _getColorFilter(color, colorBlendMode);

Expand Down Expand Up @@ -406,6 +412,7 @@ class SvgPicture extends StatelessWidget {
this.clipBehavior = Clip.hardEdge,
SvgTheme? theme,
@Deprecated('This no longer does anything.') bool cacheColorFilter = false,
this.errorBuilder,
}) : bytesLoader = SvgStringLoader(string, theme: theme),
colorFilter = colorFilter ?? _getColorFilter(color, colorBlendMode);

Expand Down Expand Up @@ -490,6 +497,9 @@ class SvgPicture extends StatelessWidget {
/// The color filter, if any, to apply to this widget.
final ColorFilter? colorFilter;

/// The widget to show when failed to fetch, decode, and parse the SVG data.
final SvgPictureErrorWidgetBuilder? errorBuilder;

@override
Widget build(BuildContext context) {
return createCompatVectorGraphic(
Expand All @@ -505,6 +515,7 @@ class SvgPicture extends StatelessWidget {
placeholderBuilder: placeholderBuilder,
clipViewbox: !allowDrawingOutsideViewBox,
matchTextDirection: matchTextDirection,
errorBuilder: errorBuilder,
);
}

Expand Down Expand Up @@ -567,3 +578,10 @@ class SvgPicture extends StatelessWidget {
));
}
}

/// The signature that [VectorGraphic.errorBuilder] uses to report exceptions.
typedef SvgPictureErrorWidgetBuilder = Widget Function(
BuildContext context,
Object error,
StackTrace stackTrace,
);
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