Flutter Widget of the Week

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

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

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

class MyHome extends StatefulWidget {
@override
_MyHomeState createState() => _MyHomeState();
}

class _MyHomeState extends State {
Tween myTween = Tween(
begin: Offset(1, 0),
end: Offset(0, 0),
);
var _data = [];
final _myListKey = GlobalKey();

Widget myListItem(String d, animation) {
return SlideTransition(
position: animation.drive(myTween),
child: myItem(d),
);
}

Widget myItem(String d) {
return ListTile(
title: Text(
'${d}',
style: TextStyle(fontSize: 40),
),
trailing: IconButton(
onPressed: () {
var index = _data.indexOf(d);
_data.remove(d);
_myListKey.currentState.removeItem(
index, (context, animation) => myListItem(d, animation));
},
icon: Icon(Icons.delete_forever),
),
);
}

@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter Demo'),
),
floatingActionButton: FloatingActionButton(
onPressed: () {
String newv = Random().nextInt(1000).toString();
_data.add(newv);
var index = _data.lastIndexOf(newv);
_myListKey.currentState.insertItem(index);
},
child: Icon(Icons.add),
),
body: AnimatedList(
key: _myListKey,
initialItemCount: _data.length,
itemBuilder: (context, int index, Animation animation) {
return myListItem(_data[index], animation);
},
),
);
}
}