main.dart

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

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Stack(
      alignment: Alignment.center,
      children: [
        Listener(
          behavior: HitTestBehavior.translucent,
          onPointerSignal: (event) {
            print('${event.kind} // ${event.delta}');
          },
          onPointerMove: (details) {
            print('BLUE BOX ${details.position}');
          },
          child: Container(
            color: Colors.blue,
            width: 300,
            height: 300,
            padding: const EdgeInsets.all(100),
          ),
        ),
      ],
    );
  }
}