问在颤振容器中我无法得到x和y的运动坐标。

EN

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final key = GlobalKey();
  // ignore: non_constant_identifier_names
  double X_Position = 0.00;
  // ignore: non_constant_identifier_names
  double Y_Position = 0.00;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: GestureDetector(
        onPanStart: (details) {
          RenderBox box = key.currentContext?.findRenderObject() as RenderBox;
          Offset position = box.localToGlobal(Offset.zero);
          setState(() {
            X_Position = position.dx;
            Y_Position = position.dy;
          });
        },
        onPanUpdate: (details) {
          RenderBox box = key.currentContext?.findRenderObject() as RenderBox;
          Offset position = box.localToGlobal(Offset.zero);
          setState(() {
            X_Position = position.dx;
            Y_Position = position.dy;
          });
        },
        child: Container(
          width: 500,
          height: 500,
          decoration: BoxDecoration(
            border: Border.all(
              color: Colors.black,
              width: 2,
            ),
          ),
        ),
      ),
    );
  }
}