플러터 예제

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePage createState() => _MyHomePage();
}

class _MyHomePage extends State<MyHomePage> {
  bool isUserMgmtExpd = false;
  bool isBookMgmtExpd = false;
  
  void toggleUserMgmtMenu(){
    setState((){
      isUserMgmtExpd = !isUserMgmtExpd;
      print(isUserMgmtExpd);
    });
  }
  
  void toggleBookMgmtMenu(){
    setState((){
      isBookMgmtExpd = !isBookMgmtExpd;
      print(isBookMgmtExpd);
    });
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Library Management',),
        /*
        leading: IconButton(icon: Icon(Icons.menu),
                            onPressed:() => {print("menu")}),
        */
        actions: [
          IconButton(icon: Icon(Icons.search),
                    onPressed:() => {print("search")}),
          ]
      ),
      drawer: Drawer(
        child: ListView(
          children: [
            UserAccountsDrawerHeader(
              accountName: Text('관리자'),
              accountEmail: Text('Manager@library.com'),
              currentAccountPicture: CircleAvatar(
                backgroundColor: Colors.white,
              ),
            ),
            ListTile(
              leading: Icon(Icons.supervised_user_circle),
              title: Text("User Management"),
              onTap: () => {
                print("User Management"),
                toggleUserMgmtMenu(),
              },
              trailing: Icon(Icons.keyboard_arrow_down_rounded), //keyboard_control_key_rounded 
            ),
            if(isUserMgmtExpd)
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 5,),
                child: Column(
                  children: [
                    ListTile(
                      title: Text("Register User"),
                      onTap: () => {print("Register User"),},
                    )
                  ])
              )
            ,
            ListTile(
              leading: Icon(Icons.menu_book_rounded),
              title: Text("Book Management"),
              onTap: () => {
                print("Book Management"),
                toggleBookMgmtMenu(),
              },
              trailing: Icon(Icons.keyboard_arrow_down_rounded),//keyboard_control_key_rounded 
            ),
            if(isBookMgmtExpd)
              Padding(
                padding: EdgeInsets.symmetric(horizontal: 5,),
                child: Column(
                  children: [
                    ListTile(
                      title: Text("Register Book"),
                      onTap: () => {print("Register Book"),},
                    ),
                    ListTile(
                      title: Text("Rent Book"),
                      onTap: () => {print("Rent Book"),},
                    ),
                    ListTile(
                      title: Text("Return Book"),
                      onTap: () => {print("Return Book"),},
                    ),
                  ])
              )
            ,
          ],
        ),
        ),
      body: Row(
        children: [
          Expanded(
            child: Column(
              children: [
                Expanded(
                  child: Container(
                    margin: EdgeInsets.only(left:20, right:10, bottom: 10, top:20),
                    child: Center(
                      child: Container(
                        decoration: BoxDecoration(
                          border: Border.all(
                            color: Colors.grey,
                          ),
                          borderRadius: BorderRadius.all(
                            Radius.circular(20.0),
                          ),
                        ),
                      ),
                    ),
                  ),
                ),
                Expanded(
                  child: Container(
                    margin: EdgeInsets.only(left:20, right:10, bottom: 20, top:10),
                    child: Container(
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey,),
                        borderRadius: BorderRadius.all(
                          Radius.circular(20.0),
                        ),
                      )
                    ),
                  ),
                ),
              ],
            ),
          ),
          Expanded(
            child: Column(
              children: [
                Expanded(
                  child: Container(
                    margin: EdgeInsets.only(left:10, right:20, bottom: 10, top:20),
                    child: Container(
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey,),
                        borderRadius: BorderRadius.all(
                          Radius.circular(20.0),
                        ),
                      )
                    ),
                  ),
                ),
                Expanded(
                  child: Container(
                    margin: EdgeInsets.only(left:10, right:20, bottom: 20, top:10),
                    child: Container(
                      decoration: BoxDecoration(
                        border: Border.all(color: Colors.grey,),
                        borderRadius: BorderRadius.all(
                          Radius.circular(20.0),
                        ),
                      )
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyHomePage(),
    title: "Library Management",
    theme: ThemeData(primarySwatch: Colors.orange),
    )
  );
}