Main app entry file for Flutter custom scroll demo

main.dart

import 'package:flutter/material.dart';
import 'demo-card.dart';
import 'items.dart';
import 'animated-bg.dart';

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

class AnimationDemo extends StatelessWidget {

    @override
    Widget build(BuildContext context) {

        return MaterialApp(
            title: 'Flutter Demo',
            theme: ThemeData(primarySwatch: Colors.deepPurple),
            home: MyHomePage(title: 'Flutter Animation Demo'),
        );
    }
}

class MyHomePage extends StatefulWidget {

    MyHomePage({Key key, this.title}) : super(key: key);
    final String title;

    @override
    _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {

    ScrollController _controller = new ScrollController();

    List<DemoCard> get _cards =>
        items.map((Item _item) => DemoCard(_item)).toList();

    @override
    Widget build(BuildContext context) {

        return Scaffold(

            backgroundColor: Colors.black,
            appBar: AppBar(title: Text(widget.title)),
            body: Stack(

                alignment: AlignmentDirectional.topStart,
                children: <Widget>[

                    AnimatedBackground(controller: _controller),
                    Center(
                        child: ListView(
                            controller: _controller,
                            children: _cards
                        )
                    )
                ]
            )
        );
    }
}