import 'package:flutter/material.dart';

void main() => runApp(A11yApp());

class A11yApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final appBar =
    AppBar(title: const Icon(Icons.archive));

    return MaterialApp(
      home: Scaffold(
        appBar: appBar,
        body: SingleChildScrollView(
          child: Column(
            children: [_buildGridView(), _buildGridView(), _buildGridView()],
          ),
        ),
      ),
    );
  }

  Widget _buildGridView() {
    return Column(
      children: [
        const Text('Grid header'),
        GridView.count(
          shrinkWrap: true,
          crossAxisSpacing: 10,
          mainAxisSpacing: 10,
          crossAxisCount: 2,
          children: <Widget>[
            for (var i = 0; i < 50; ++i)
              Container(
                padding: const EdgeInsets.all(8),
                color: Colors.green[100],
                child: Text('Number $i'),
              ),
          ],
        ),
      ],
    );
  }
}