Move container to a different location on touch in flutter

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @
override

  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Move Container on Touch App'),
        ),
        body: const TouchMoveExample(),
      ),
    );
  }
}

class TouchMoveExample extends StatefulWidget {
  const TouchMoveExample({super.key});
  @
override

  State<TouchMoveExample> createState() => _TouchMoveExampleState();
}

class _TouchMoveExampleState extends State<TouchMoveExample> {
  double _xPosition = 0;
  double _yPosition = 0;
  @
override

  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        Positioned(
          left: _xPosition,
          top: _yPosition,
          child: GestureDetector(
            onPanUpdate: (details) {
              setState(() {
                _xPosition += details.delta.dx;
                _yPosition += details.delta.dy;
              });
            },
            child: Container(
              width: 100,
              height: 100,
              color: Colors.red,
            ),
          ),
        ),
      ],
    );
  }
}