PopupMenuButton 弹出菜单组

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

enum ConferenceItem { AddMember, LockConference, ModifyLayout, TurnoffAll }

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "PopupMenuButton组件示例",
      home: Scaffold(
        appBar: AppBar(
          title: Text("PopupMenuButton组件示例"),
        ),
        body: Center(
          child: FlatButton(
            child: PopupMenuButton(
              onSelected: (ConferenceItem result) {},
              itemBuilder: (BuildContext context) =>
                  <PopupMenuEntry<ConferenceItem>>[
                const PopupMenuItem<ConferenceItem>(
                  value: ConferenceItem.AddMember,
                  child: Text('添加成员'),
                ),
                const PopupMenuItem<ConferenceItem>(
                  value: ConferenceItem.LockConference,
                  child: Text('锁定布局'),
                ),
                const PopupMenuItem<ConferenceItem>(
                  value: ConferenceItem.ModifyLayout,
                  child: Text('修改布局'),
                ),
                const PopupMenuItem<ConferenceItem>(
                  value: ConferenceItem.TurnoffAll,
                  child: Text('挂断所有'),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}