如何在flutter中创建带有图标的向上滑动面板？

import 'package:flutter/material.dart';

class MyPanel extends StatefulWidget {
  @override
  _MyPanelState createState() => _MyPanelState();
}

class _MyPanelState extends State<MyPanel> {
  List<Item> _items = generateItems(3); // 生成面板的列表

  @override
  Widget build(BuildContext context) {
    return ListView(
      children: _items.map<Widget>((Item item) {
        return ExpansionPanelList(
          elevation: 1,
          expandedHeaderPadding: EdgeInsets.all(0),
          expansionCallback: (int index, bool isExpanded) {
            setState(() {
              item.isExpanded = !isExpanded;
            });
          },
          children: [
            ExpansionPanel(
              headerBuilder: (BuildContext context, bool isExpanded) {
                return ListTile(
                  leading: Icon(item.icon), // 设置图标
                  title: Text(item.title),
                );
              },
              body: ListTile(
                title: Text(item.body),
              ),
              isExpanded: item.isExpanded,
            ),
          ],
        );
      }).toList(),
    );
  }
}

class Item {
  Item({
    required this.icon,
    required this.title,
    required this.body,
    this.isExpanded = false,
  });

  IconData icon; // 图标
  String title; // 面板标题
  String body; // 面板内容
  bool isExpanded; // 面板展开状态
}

List<Item> generateItems(int count) {
  return List<Item>.generate(count, (int index) {
    return Item(
      icon: Icons.info, // 设置图标
      title: '面板 $index',
      body: '这是面板 $index 的内容',
    );
  });
}

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: Text('滑动面板示例'),
      ),
      body: MyPanel(),
    ),
  ));
}