Scroll Animation on timed delay - Experiment for https://github.com/flutter/flutter/pull/37267

main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  final _controller = new ScrollController();

  Future<void> awaitAndAnimate() async {
    print('Waiting');
    await Future.delayed(Duration(seconds: 5));
    _controller.animateTo(10000.0, duration: const Duration(seconds: 2), curve: Curves.elasticOut);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Timed Scroll Animation')),
      body: ListView.builder(
          padding: EdgeInsets.all(8.0),
          controller: _controller,
          itemExtent: 60.0,
          itemBuilder: (BuildContext context, int index) {
            return FlatButton(
              child: Text('Item No. $index'),
              // After pressing the button, tap and hold, do not drag.
              onPressed: awaitAndAnimate,
            );
          },
        ),
    );
  }
}