import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('scroll demo'),
      ),
      body: ListView(
        children: getList(),
      ),
    );
  }

  List<Widget> getList() {
    List<Widget> _list = [];
    for (int i = 0; i < 20; i++) {
      _list.add(DemoTile(i + 1));
    }
    return _list;
  }
}

class DemoTile extends StatelessWidget {
  final int number;
  DemoTile(this.number);
  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(36.0),
      child: TextButton(
        child: Text('This is Tile number $number'),
        onPressed: () {
          print('pressed : $number');
        },
      ),
    );
  }
}