Flutter实战技巧之-显示html标签

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先看看效果图：

show html.gif
实现：
导入flutter_html

dependencies:
  flutter_html: ^1.0.0

页面代码：

import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html/html_parser.dart';
import 'package:flutter_html/style.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, 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>Table support (with custom styling!):</h3>
      <p>
      <q>Famous quote...</q>
      </p>
      <table>
      <colgroup>
        <col width="50%" />
        <col width="25%" />
        <col width="25%" />
      </colgroup>
      <thead>
      <tr><th>One</th><th>Two</th><th>Three</th></tr>
      </thead>
      <tbody>
      <tr>
        <td>Data</td><td>Data</td><td>Data</td>
      </tr>
      <tr>
        <td>Data</td><td>Data</td><td>Data</td>
      </tr>
      </tbody>
      <tfoot>
      <tr><td>fData</td><td>fData</td><td>fData</td></tr>
      </tfoot>
      </table>
      <h3>Custom Element Support:</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>
      <p>
        <img alt='Google' src='https://www.google.cn/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' />
        <a href='https://google.com'><img alt='Google' src='https://www.google.cn/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png' /></a>
        <img alt='Alt Text of an intentionally broken image' src='https://www.google.cn/images/branding/googlelogo/2x/googlelogo_color_92x30d' />
      </p>
      <!--
      <h3>Video support:</h3>
      <video controls>
        <source src="https://www.w3schools.com/html/mov_bbb.mp4" />
      </video>
      <h3>Audio support:</h3>
      <audio controls>
        <source src="https://www.w3schools.com/html/horse.mp3" />
      </audio>
      <h3>IFrame support:</h3>
      <iframe src="https://google.com"></iframe>
      -->
""";

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:
          style: {
            "html": Style(
              backgroundColor: Colors.black12,
//              color: Colors.white,
            ),
//            "h1": Style(
//              textAlign: TextAlign.center,
//            ),
            "table": Style(
              backgroundColor: Color.fromARGB(0x50, 0xee, 0xee, 0xee),
            ),
            "tr": Style(
              border: Border(bottom: BorderSide(color: Colors.grey)),
            ),
            "th": Style(
              padding: EdgeInsets.all(6),
              backgroundColor: Colors.grey,
            ),
            "td": Style(
              padding: EdgeInsets.all(6),
            ),
            "var": Style(fontFamily: 'serif'),
          },
          customRender: {
            "flutter": (RenderContext context, Widget child, attributes, _) {
              return FlutterLogo(
                style: (attributes['horizontal'] != null)
                    ? FlutterLogoStyle.horizontal
                    : FlutterLogoStyle.markOnly,
                textColor: context.style.color,
                size: context.style.fontSize.size * 5,
              );
            },
          },
          onLinkTap: (url) {
            print("Opening $url...");
          },
          onImageTap: (src) {
            print(src);
          },
          onImageError: (exception, stackTrace) {
            print(exception);
          },
        ),
      ),
    );
  }
}