flutter_html 3.0.0-alpha.6 
flutter_html: ^3.0.0-alpha.6 copied to clipboard
sub6resources.comA Flutter widget rendering static HTML and CSS as Flutter widgets.
import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html_all/flutter_html_all.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.deepPurple,
),
home: const MyHomePage(title: 'flutter_html Example'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
@override
MyHomePageState createState() => MyHomePageState();
}
const htmlData = r"""
<p id='top'><a href='#bottom'>Scroll to bottom</a></p>
<h1>Header 1</h1>
<h2>Header 2</h2>
<h3>Header 3</h3>
<h4>Header 4</h4>
<h5>Header 5</h5>
<h6>Header 6</h6>
<h3>Ruby Support:</h3>
<p>
<ruby>
漢<rt>かん</rt>
字<rt>じ</rt>
</ruby>
is Japanese Kanji.
</p>
<h3>Support for maxLines:</h3>
<h5>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec vestibulum sapien feugiat lorem tempor, id porta orci elementum. Fusce sed justo id arcu egestas congue. Fusce tincidunt lacus ipsum, in imperdiet felis ultricies eu. In ullamcorper risus felis, ac maximus dui bibendum vel. Integer ligula tortor, facilisis eu mauris ut, ultrices hendrerit ex. Donec scelerisque massa consequat, eleifend mauris eu, mollis dui. Donec placerat augue tortor, et tincidunt quam tempus non. Quisque sagittis enim nisi, eu condimentum lacus egestas ac. Nam facilisis luctus ipsum, at aliquam urna fermentum a. Quisque tortor dui, faucibus in ante eget, pellentesque mattis nibh. In augue dolor, euismod vitae eleifend nec, tempus vel urna. Donec vitae augue accumsan ligula fringilla ultrices et vel ex.</h5>
<h3>Support for <code>sub</code>/<code>sup</code></h3>
Solve for <var>x<sub>n</sub></var>: log<sub>2</sub>(<var>x</var><sup>2</sup>+<var>n</var>) = 9<sup>3</sup>
<p>One of the most <span>common</span> equations in all of physics is <br /><var>E</var>=<var>m</var><var>c</var><sup>2</sup>.</p>
<h3>Inline Styles:</h3>
<p>The should be <span style='color: blue;'>BLUE style='color: blue;'</span></p>
<p>The should be <span style='color: red;'>RED style='color: red;'</span></p>
<p>The should be <span style='color: rgba(0, 0, 0, 0.10);'>BLACK with 10% alpha style='color: rgba(0, 0, 0, 0.10);</span></p>
<p>The should be <span style='color: rgb(0, 97, 0);'>GREEN style='color: rgb(0, 97, 0);</span></p>
<p>The should be <span style='background-color: red; color: rgb(0, 97, 0);'>GREEN style='color: rgb(0, 97, 0);</span></p>
<h3>Text Alignment</h3>
<p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">Center Aligned Text</span></p>
<p style="text-align: right;"><span style="color: rgba(0, 0, 0, 0.95);">Right Aligned Text</span></p>
<p style="text-align: justify;"><span style="color: rgba(0, 0, 0, 0.95);">Justified Text</span></p>
<p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">Center Aligned Text</span></p>
<h3>Auto Margins</h3>
<div style="width: 150px; height: 20px; background-color: #ff9999;">Default Div</div>
<div style="width: 150px; height: 20px; background-color: #99ff99; margin: auto;">margin: auto</div>
<div style="width: 150px; height: 20px; background-color: #ff99ff; margin: 15px auto;">margin: 15px auto</div>
<div style="width: 150px; height: 20px; background-color: #9999ff; margin-left: auto;">margin-left: auto</div>
<p>With an image - non-block (should not center):</p>
<img alt='' style="margin: auto;" src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png">
<p>block image (should center):</p>
<img alt='' style="display: block; margin: auto;" src="https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png">
<h3>Table support (with custom styling!):</h3>
<p>
<q>Famous quote...</q>
</p>
<table>
<colgroup>
<col width="50%" />
<col span="2" width="25%" />
</colgroup>
<thead>
<tr><th>One</th><th>Two</th><th>Three</th></tr>
</thead>
<tbody>
<tr>
<td rowspan='2'>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan<br>Rowspan</td><td>Data</td><td>Data</td>
</tr>
<tr>
<td colspan="2"><img alt='Google' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' /></td>
</tr>
</tbody>
<tfoot>
<tr><td>fData</td><td>fData</td><td>fData</td></tr>
</tfoot>
</table>
<h3>Custom Element Support (inline: <bird></bird> and as block):</h3>
<flutter></flutter>
<flutter horizontal></flutter>
<h3 id='middle'>SVG support:</h3>
<svg id='svg1' viewBox='0 0 100 100' xmlns='http://www.w3.org/2000/svg'>
<circle r="32" cx="35" cy="65" fill="#F00" opacity="0.5"/>
<circle r="32" cx="65" cy="65" fill="#0F0" opacity="0.5"/>
<circle r="32" cx="50" cy="35" fill="#00F" opacity="0.5"/>
</svg>
<h3>List support:</h3>
<ol>
<li>This</li>
<li><p>is</p></li>
<li>an</li>
<li>
ordered
<ul>
<li>With<br /><br />...</li>
<li>a</li>
<li>nested</li>
<li>unordered
<ol style="list-style-type: lower-alpha;" start="5">
<li>With a nested</li>
<li>ordered list</li>
<li>with a lower alpha list style</li>
<li>starting at letter e</li>
</ol>
</li>
<li>list</li>
</ul>
</li>
<li>list! Lorem ipsum dolor sit amet.</li>
<li><h2>Header 2</h2></li>
<h2><li>Header 2</li></h2>
</ol>
<h3>Link support:</h3>
<p>
Linking to <a href='https://github.com'>websites</a> has never been easier.
</p>
<h3>Image support:</h3>
<h3>Network png</h3>
<img alt='Google' src='https://www.google.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' />
<h3>Network svg</h3>
<img src='https://dev.w3.org/SVG/tools/svgweb/samples/svg-files/android.svg' />
<h3>Local asset png</h3>
<img src='asset:assets/html5.png' width='100' />
<h3>Local asset svg</h3>
<img src='asset:assets/mac.svg' width='100' />
<h3>Data uri (with base64 support)</h3>
<img alt='Red dot (png)' src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==' />
<img alt='Green dot (base64 svg)' src='data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPHN2ZyB2aWV3Qm94PSIwIDAgMzAgMjAiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+CjxjaXJjbGUgY3g9IjE1IiBjeT0iMTAiIHI9IjEwIiBmaWxsPSJncmVlbiIvPgo8L3N2Zz4=' />
<img alt='Green dot (plain svg)' src='data:image/svg+xml,%3C?xml version="1.0" encoding="UTF-8"?%3E%3Csvg viewBox="0 0 30 20" xmlns="http://www.w3.org/2000/svg"%3E%3Ccircle cx="15" cy="10" r="10" fill="yellow"/%3E%3C/svg%3E' />
<h3>Custom source matcher (relative paths)</h3>
<img src='/wikipedia/commons/thumb/e/ef/Octicons-logo-github.svg/200px-Octicons-logo-github.svg.png' />
<h3>Custom image render (flutter.dev)</h3>
<img src='https://flutter.dev/images/flutter-mono-81x100.png' />
<h3>No image source</h3>
<img alt='No source' />
<img alt='Empty source' src='' />
<h3>Broken network image</h3>
<img alt='Broken image' src='https://www.notgoogle.com/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' />
<h3>MathML Support:</h3>
<math>
<mrow>
<mi>x</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mrow>
<mo>-</mo>
<mi>b</mi>
</mrow>
<mo>±</mo>
<msqrt>
<mrow>
<msup>
<mi>b</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mrow>
<mn>4</mn>
<mo>⁢</mo>
<mi>a</mi>
<mo>⁢</mo>
<mi>c</mi>
</mrow>
</mrow>
</msqrt>
</mrow>
<mrow>
<mn>2</mn>
<mo>⁢</mo>
<mi>a</mi>
</mrow>
</mfrac>
</mrow>
</math>
<math>
<munderover >
<mo> ∫ </mo>
<mn> 0 </mn>
<mi> 5 </mi>
</munderover>
<msup>
<mi>x</mi>
<mn>2</mn>
</msup>
<mo>⋅</mo>
<mi>ⅆ</mi><mi>x</mi>
<mo>=</mo>
<mo>[</mo>
<mfrac>
<mn>1</mn>
<mi>3</mi>
</mfrac>
<msup>
<mi>x</mi>
<mn>3</mn>
</msup>
<msubsup>
<mo>]</mo>
<mn>0</mn>
<mn>5</mn>
</msubsup>
<mo>=</mo>
<mfrac>
<mn>125</mn>
<mi>3</mi>
</mfrac>
<mo>-</mo>
<mn>0</mn>
<mo>=</mo>
<mfrac>
<mn>125</mn>
<mi>3</mi>
</mfrac>
</math>
<math>
<msup>
<mo>sin</mo>
<mn>2</mn>
</msup>
<mo>θ</mo>
<mo>+</mo>
<msup>
<mo>cos</mo>
<mn>2</mn>
</msup>
<mo>θ</mo>
<mo>=</mo>
<mn>1</mn>
</math>
<h3>Tex Support with the custom tex tag:</h3>
<tex>i\hbar\frac{\partial}{\partial t}\Psi(\vec x,t) = -\frac{\hbar}{2m}\nabla^2\Psi(\vec x,t)+ V(\vec x)\Psi(\vec x,t)</tex>
<p id='bottom'><a href='#top'>Scroll to top</a></p>
""";
final staticAnchorKey = GlobalKey();
class MyHomePageState extends State<MyHomePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('flutter_html Example'),
centerTitle: true,
),
floatingActionButton: FloatingActionButton(
child: const Icon(Icons.arrow_downward),
onPressed: () {
final anchorContext =
AnchorKey.forId(staticAnchorKey, "bottom")?.currentContext;
if (anchorContext != null) {
Scrollable.ensureVisible(anchorContext);
}
},
),
body: SingleChildScrollView(
child: Html(
anchorKey: staticAnchorKey,
data: htmlData,
style: {
"table": Style(
backgroundColor: const Color.fromARGB(0x50, 0xee, 0xee, 0xee),
),
"tr": Style(
border: const Border(bottom: BorderSide(color: Colors.grey)),
),
"th": Style(
padding: const EdgeInsets.all(6),
backgroundColor: Colors.grey,
),
"td": Style(
padding: const EdgeInsets.all(6),
alignment: Alignment.topLeft,
),
'h5': Style(maxLines: 2, textOverflow: TextOverflow.ellipsis),
},
tagsList: Html.tags..addAll(['tex', 'bird', 'flutter']),
customRenders: {
tagMatcher("tex"): CustomRender.widget(
widget: (context, buildChildren) => Math.tex(
context.tree.element?.innerHtml ?? '',
mathStyle: MathStyle.display,
textStyle: context.style.generateTextStyle(),
onErrorFallback: (FlutterMathException e) {
return Text(e.message);
},
)),
tagMatcher("bird"): CustomRender.inlineSpan(
inlineSpan: (context, buildChildren) =>
const TextSpan(text: "🐦")),
tagMatcher("flutter"): CustomRender.widget(
widget: (context, buildChildren) => FlutterLogo(
style: (context.tree.element!.attributes['horizontal'] !=
null)
? FlutterLogoStyle.horizontal
: FlutterLogoStyle.markOnly,
textColor: context.style.color!,
size: context.style.fontSize!.value * 5,
)),
tagMatcher("table"): CustomRender.widget(
widget: (context, buildChildren) => SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: tableRender
.call()
.widget!
.call(context, buildChildren),
)),
audioMatcher(): audioRender(),
iframeMatcher(): iframeRender(),
mathMatcher():
mathRender(onMathError: (error, exception, exceptionWithType) {
debugPrint(exception);
return Text(exception);
}),
svgTagMatcher(): svgTagRender(),
svgDataUriMatcher(): svgDataImageRender(),
svgAssetUriMatcher(): svgAssetImageRender(),
svgNetworkSourceMatcher(): svgNetworkImageRender(),
networkSourceMatcher(domains: ["flutter.dev"]):
CustomRender.widget(widget: (context, buildChildren) {
return const FlutterLogo(size: 36);
}),
networkSourceMatcher(domains: ["mydomain.com"]): networkImageRender(
headers: {"Custom-Header": "some-value"},
altWidget: (alt) => Text(alt ?? ""),
loadingWidget: () => const Text("Loading..."),
),
// On relative paths starting with /wiki, prefix with a base url
(context) =>
context.tree.element?.attributes["src"] != null &&
context.tree.element!.attributes["src"]!
.startsWith("/wiki"): networkImageRender(
mapUrl: (url) => "https://upload.wikimedia.org${url!}"),
// Custom placeholder image for broken links
networkSourceMatcher():
networkImageRender(altWidget: (_) => const FlutterLogo()),
videoMatcher(): videoRender(),
},
onLinkTap: (url, _, __, ___) {
debugPrint("Opening $url...");
},
onImageTap: (src, _, __, ___) {
debugPrint(src);
},
onImageError: (exception, stackTrace) {
debugPrint(exception.toString());
},
onCssParseError: (css, messages) {
debugPrint("css that errored: $css");
debugPrint("error messages:");
for (var element in messages) {
debugPrint(element.toString());
}
return '';
},
),
),
);
}
}
CustomRenderMatcher texMatcher() =>
(context) => context.tree.element?.localName == 'tex';
CustomRenderMatcher birdMatcher() =>
(context) => context.tree.element?.localName == 'bird';
CustomRenderMatcher flutterMatcher() =>
(context) => context.tree.element?.localName == 'flutter';Metadata
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Metadata
A Flutter widget rendering static HTML and CSS as Flutter widgets.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
collection, csslib, flutter, html, numerus
