flutter_html 2.0.0-nullsafety.0

A Flutter widget rendering static HTML and CSS as Flutter widgets.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html/image_render.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.deepPurple,
      ),
      home: new MyHomePage(title: 'flutter_html Example'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => new _MyHomePageState();
}

const htmlData = """
<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>
        &nbsp;is Japanese Kanji.
      </p>
      <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>
      <p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
      <p style="text-align: right;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
      <p style="text-align: justify;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
      <p style="text-align: center;"><span style="color: rgba(0, 0, 0, 0.95);">blasdafjklasdlkjfkl</span></p>
      <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\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan\nRowspan</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>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>
            <li>With a nested</li>
            <li>ordered list.</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>Base64</h3>
      <img alt='Red dot' src='data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==' />
      <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' />
""";

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: AppBar(
        title: Text('flutter_html Example'),
        centerTitle: true,
      ),
      body: SingleChildScrollView(
        child: Html(
          data: htmlData,
          //Optional parameters:
          customImageRenders: {
            networkSourceMatcher(domains: ["flutter.dev"]):
                (context, attributes, element) {
              return FlutterLogo(size: 36);
            },
            networkSourceMatcher(domains: ["mydomain.com"]): networkImageRender(
              headers: {"Custom-Header": "some-value"},
              altWidget: (alt) => Text(alt ?? ""),
              loadingWidget: () => Text("Loading..."),
            ),
            // On relative paths starting with /wiki, prefix with a base url
            (attr, _) => attr["src"] != null && attr["src"]!.startsWith("/wiki"):
                networkImageRender(
                    mapUrl: (url) => "https://upload.wikimedia.org" + url!),
            // Custom placeholder image for broken links
            networkSourceMatcher(): networkImageRender(altWidget: (_) => FlutterLogo()),
          },
          onLinkTap: (url, _, __, ___) {
            print("Opening $url...");
          },
          onImageTap: (src, _, __, ___) {
            print(src);
          },
          onImageError: (exception, stackTrace) {
            print(exception);
          },
        ),
      ),
    );
  }
}