PopupMenuButton

 

 

 

 

 

import 'package:flutter/material.dart';

enum RGB { red, green, blue }

void main() => runApp(WidgetDemo());

class WidgetDemo extends StatefulWidget {
  @override
  _WidgetDemoState createState() => _WidgetDemoState();
}

class _WidgetDemoState extends State<WidgetDemo> {
  RGB _selection = RGB.red;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('PoopupMenuButton Demo'),
        ),
        body: Center(
          child: PopupMenuButton<RGB>(
            onSelected: (RGB result) {
              setState(() {
                _selection = result;
              });
            },
            itemBuilder: (BuildContext context) =>
            <PopupMenuEntry<RGB>>[
              const PopupMenuItem<RGB>(child: Text('Red'), value: RGB.red,),
              const PopupMenuItem<RGB>(child: Text('Green'), value: RGB.green,),
              const PopupMenuItem<RGB>(child: Text('Blue'), value: RGB.blue,),
            ],
          ),
        ),
      ),
    );
  }
}

_selection 변수는 어떤 메뉴를 선택했는지 알기위해 필요하다. 

 

Flutter class 문서는 다음과 같다.

https://api.flutter.dev/flutter/material/PopupMenuButton-class.html

PopupMenuButton class - material library - Dart API