[Flutter] Use Flutter-Widget-From-Html to achieve rich text rendering to solve cross-platform HTML display problems

I. Introduction

In modern mobile development, the importance of HTML cannot be overstated. Not only is HTML fundamental to web development, but it also plays an important role in mobile development. As an excellent cross-platform development framework, Flutter has been widely welcomed by developers due to its powerful performance and flexible customization capabilities. So, how to handle HTML gracefully in Flutter? The answer is to use Flutter-Widget-From-Html.

• Introduce the importance of HTML in mobile development : HTML is the foundation of web development and plays an important role in mobile development.
• Flutter's cross-platform advantage : one set of code, multi-platform operation, greatly improving development efficiency.
• Why choose Flutter-Widget-From-Html : Powerful, supports more than 70 tags, including hyperlinks, pictures, audio, video, iframe, etc.
• What knowledge can this article help you master : From basic use to advanced skills, master Flutter-Widget-From-Html in an all-round way.

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2. Introduction and environment configuration of Flutter-Widget-From-Html

1. The origin and development of Flutter-Widget-From-Html

Flutter-Widget-From-Html is a powerful Flutter plugin that allows developers to easily convert HTML to Flutter Widget. Supports more than 70 common HTML tags, including hyperlinks, pictures, audio, video, iframe, etc.

2. Main functions and advantages

• Render HTML : Quickly render HTML as a Flutter Widget.
• Style customization : CSS is supported to make style customization more flexible.
• Multimedia support : Easily handle multimedia content such as pictures and videos.
• Scalability : The application size can be controlled through different mixins.

3. Applicable scenarios

• News Reader : Fast rendering of news content.
• Product details page : display rich product information.
• Educational application : display teaching content, etc.

4. Installation and configuration of Flutter-Widget-From-Html

pubspec.yamlAdd the following dependencies to the file :

dependencies:
  flutter_widget_from_html: ^0.10.3

Then run flutter pub getinstall plugin.

3. Basic use

1. Render simple HTML text

Rendering HTML text with Flutter-Widget-From-Html is very simple. Here is a basic example:

import 'package:flutter_widget_from_html/flutter_widget_from_html.dart';

HtmlWidget(
  '<h3>Heading</h3><p>A paragraph with <strong>strong</strong>, <em>emphasized</em> and <span style="color: red">colored</span> text.</p>',
);

2. Style customization

You can customize styles with CSS. For example:

HtmlWidget(
  '同上示例',
  customStylesBuilder: (element) {
    
    
    if (element.classes.contains('foo')) {
    
    
      return {
    
    'color': 'red'};
    }
    return null;
  },
);

3. Image and multimedia processing

Flutter-Widget-From-Html supports image and multimedia rendering. For example:

HtmlWidget(
  '<img src="https://example.com/image.jpg" />',
);

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4. Advanced usage

1. Handle complex HTML structures

Flutter-Widget-From-Html can handle not only simple HTML text, but also complex HTML structures. The following is an example of a complex HTML structure:

HtmlWidget(
  '''
  <table>
    <tr>
      <th>标题</th>
      <th>内容</th>
    </tr>
    <tr>
      <td>Flutter</td>
      <td>优秀的跨平台开发框架</td>
    </tr>
  </table>
  ''',
);

2. Custom Widget rendering

You can implement more complex functions by customizing Widget rendering. For example:

HtmlWidget(
  '同上示例',
  customWidgetBuilder: (element) {
    
    
    if (element.attributes['foo'] == 'bar') {
    
    
      return FooBarWidget();
    }
    return null;
  },
);

3. Error and Load Handling

When a complex element fails to load or an error occurs, you can use a specific callback to handle it. For example:

HtmlWidget(
  '同上示例',
  onErrorBuilder: (context, element, error) => Text('$element error: $error'),
  onLoadingBuilder: (context, element, loadingProgress) => CircularProgressIndicator(),
);

4. Hyperlink and IFRAME support

Flutter-Widget-From-Html supports hyperlinks and IFRAME. For example:

HtmlWidget(
  '<a href="https://example.com">点击这里</a>',
  onTapUrl: (url) => print('tapped $url'),
  webView: true,
);

5. Style and layout

1. Text styles

You can customize text styles with CSS. For example:

HtmlWidget(
  '<p style="color:blue;">蓝色文字</p>',
);

2. List styles

Flutter-Widget-From-Html supports multiple list styles. For example:

HtmlWidget(
  '<ul style="list-style-type:circle;"><li>项目1</li><li>项目2</li></ul>',
);

3. Table style

You can customize the table style through CSS. For example:

HtmlWidget(
  '<table style="border:1px solid black;"><tr><td>单元格</td></tr></table>',
);

6. Expansibility

1. Use flutter_widget_from_html_core

If you don't want to include all dependencies, you can use flutter_widget_from_html_core with the required mixins to control the app size.

2. Supported HTML tags

The HTML tags supported by Flutter-Widget-From-Html are very rich, including but not limited to: A, AUDIO, H1-H6, IFRAME, IMG, LI/OL/UL, TABLE, etc.

3. Supported attributes and inline styles

Supported properties and inline styles include: align, dir, background, border, color, font-family, font-size, line-height, margin, padding, text-align, etc.

Great, let's move on to the last few chapters.

7. Version information

• Flutter version : 3.10.0
• Dart SDK version : 3.0.0
• Flutter-Widget-From-Html version number : 0.10.3

8. Summary

This article introduces in detail how to use Flutter-Widget-From-Html, from basic HTML rendering to advanced custom Widget rendering, from style customization to error and loading handling. Through the study of this article, you will be able to master the powerful functions of Flutter-Widget-From-Html and apply it in actual development.

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