flutter_markdown_latex 0.2.0

flutter_markdown_latex: ^0.2.0 copied to clipboard

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_markdown/flutter_markdown.dart';
import 'package:flutter_markdown_latex/flutter_markdown_latex.dart';
import 'package:markdown/markdown.dart' as md;

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 Markdown Latex Example',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a blue toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Latex Example'),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final text = '''
This is inline latex: \$f(x) = \\sum_{i=0}^{n} \\frac{a_i}{1+x}\$

This is block level latex:

\$
c = \\pm\\sqrt{a^2 + b^2}
\$

This is inline latex with displayMode: \$\$f(x) = \\sum_{i=0}^{n} \\frac{a_i}{1+x}\$\$

To calculate the area of an equilateral triangle using trigonometric functions, one can consider using the length of the side and the height. The relationship between the height and the side length of an equilateral triangle is:

\\[ \\text{Height} = \\frac{\\sqrt{3}}{2} \\times \\text{Side Length} \\]

因此，边长为 9 的正三角形的面积为：

\\[ \\text{面积} = \\frac{1}{2} \\times \\text{底} \\times \\text{高} = \\frac{1}{2} \\times 9 \\times \\frac{\\sqrt{3}}{2} \\times 9 = \\frac{81\\sqrt{3}}{4} \\]

所以正三角形的面积为 \\( \\frac{81\\sqrt{3}}{4} \\)。

''';

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: MarkdownBody(
            selectable: true,
            data: text,
            builders: {
              'latex': LatexElementBuilder(
                textStyle: const TextStyle(color: Colors.blue),
              ),
            },
            extensionSet: md.ExtensionSet(
              [LatexBlockSyntax()],
              [LatexInlineSyntax()],
            ),
          )), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}