如何添加一个可拖动的“文本字段”，以便在flutter中的图像上添加文本？

import 'package:flutter/material.dart';

class DraggableTextField extends StatefulWidget {
  @override
  _DraggableTextFieldState createState() => _DraggableTextFieldState();
}

class _DraggableTextFieldState extends State<DraggableTextField> {
  double _x = 0.0;
  double _y = 0.0;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Positioned(
          left: _x,
          top: _y,
          child: GestureDetector(
            onPanUpdate: (details) {
              setState(() {
                _x += details.delta.dx;
                _y += details.delta.dy;
              });
            },
            child: TextField(
              decoration: InputDecoration(
                hintText: 'Enter text',
              ),
            ),
          ),
        ),
      ],
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('Draggable Text Field'),
      ),
      body: DraggableTextField(),
    ),
  ));
}