使用Listener类在Flutter中点击Container时如何更改BoxShadow？

import 'package:flutter/material.dart';

class MyContainer extends StatefulWidget {
  @override
  _MyContainerState createState() => _MyContainerState();
}

class _MyContainerState extends State<MyContainer> {
  bool isPressed = false; // 默认为未点击状态

  @override
  Widget build(BuildContext context) {
    return Listener(
      onPointerDown: (event) {
        setState(() {
          isPressed = true; // 修改为点击状态
        });
      },
      onPointerUp: (event) {
        setState(() {
          isPressed = false; // 修改为未点击状态
        });
      },
      child: Container(
        width: 200,
        height: 200,
        decoration: BoxDecoration(
          color: Colors.blue,
          boxShadow: [
            if (isPressed)
              BoxShadow(
                color: Colors.grey,
                blurRadius: 10,
                spreadRadius: 2,
              ),
          ],
        ),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      body: Center(
        child: MyContainer(),
      ),
    ),
  ));
}