颤动Dart中缺少DrawerItem类

import 'package:flutter/material.dart';

class DrawerItem extends StatelessWidget {
  final String title;
  final IconData icon;
  final Function onTap;

  const DrawerItem({
    Key key,
    @required this.title,
    @required this.icon,
    @required this.onTap,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return ListTile(
      leading: Icon(icon),
      title: Text(title),
      onTap: onTap,
    );
  }
}

DrawerItem(
  title: 'Home',
  icon: Icons.home,
  onTap: () {
    // 导航到主页
  },
)