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

void main() {
  return runApp(TestPage());
}

//リスト4.51
class TestPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Draggable',
      home: Scaffold(
        appBar: AppBar(title: Text('Draggable')),
        body: Center(
          child: Draggable(
            feedback: Icon(Icons.run_circle_outlined, size: 100),
            childWhenDragging: Icon(Icons.play_arrow, size: 100),
            onDraggableCanceled: (_, offset) {},
            child: Icon(Icons.stop, size: 100)
          )
        )
      )
    );
  }
}