Flutter Horizontal Listwheel Scroll View

HorizontalListWheelScrollView.dart

// Copyright (c) 2021, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {

  double itemWidth = 60.0;
  int itemCount = 100;
  int selected = 50;
  FixedExtentScrollController _scrollController =
      FixedExtentScrollController(initialItem: 50);
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
          child: RotatedBox(
              quarterTurns: -1,
              child: ListWheelScrollView(
                magnification: 2.0,
                onSelectedItemChanged: (x) {
                  setState(() {
                    selected = x;
                  });
                  print(selected);
                },
                controller: _scrollController,
                children: List.generate(
                    itemCount,
                    (x) => RotatedBox(
                        quarterTurns: 1,
                        child: AnimatedContainer(
                            duration: Duration(milliseconds: 400),
                            width: x == selected ? 60 : 50,
                            height: x == selected ? 60 : 50,
                            alignment: Alignment.center,
                            decoration: BoxDecoration(
                                color: x == selected ? Colors.red : Colors.grey,
                                shape: BoxShape.circle),
                            child: Text('$x')))),
                itemExtent: itemWidth,
              ))),
      floatingActionButton: FloatingActionButton(
        onPressed: () {},
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}