如何在Flutter中不使用DragTarget的情况下创建可拖动对象？

import 'package:flutter/gestures.dart';

Container(
  width: 100,
  height: 100,
  color: Colors.blue,
  child: Center(
    child: Text('可拖动'),
  ),
  // 添加拖动手势处理
  child: GestureDetector(
    onPanUpdate: (DragUpdateDetails details) {
      // 处理拖动事件
      setState(() {
        // 更新Container的位置
        Offset offset = details.delta;
        // 可根据需要进行边界限制
        // 例如：限制Container在屏幕范围内拖动
        double newX = containerPosition.dx + offset.dx;
        double newY = containerPosition.dy + offset.dy;
        if (newX < 0) newX = 0;
        if (newX > screenWidth - containerWidth) newX = screenWidth - containerWidth;
        if (newY < 0) newY = 0;
        if (newY > screenHeight - containerHeight) newY = screenHeight - containerHeight;
        containerPosition = Offset(newX, newY);
      });
    },
    child: Container(
      width: 100,
      height: 100,
      color: Colors.blue,
      child: Center(
        child: Text('可拖动'),
      ),
    ),
  ),
),