flutter_adaptive_markdown_source.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Example(),
    );
  }
}

class Example extends StatelessWidget {
  const Example({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final size = MediaQuery.of(context).size;
    final source = getSource(size).join('\n');
    return Scaffold(
      appBar: AppBar(
        title: const Text('Adaptive Strings'),
      ),
      body: SingleChildScrollView(
        child: Text(source),
      ),
    );
  }

  Iterable<String> getSource(Size size) sync* {
    final columns = List.generate(10, (index) => 'Column $index');
    final fakeData = List.generate(1000, (index) {
      return {
        'name': 'Name $index',
        for (final column in columns) column: 'Value $index',
      };
    });
    if (size.width > 720) {
      // Render table
      yield '| ${columns.join(' | ')} |';
      for (final item in fakeData) {
        yield '| ${columns.map((column) => item[column]).join(' | ')} |';
      }
    } else {
      // Render list
      for (final item in fakeData) {
        yield '- ${item['name']}';
      }
    }
  }
}