main.dart

import 'package:flutter/material.dart';

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

class Main extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.lightGreen,
      ),
      home: HomePage(NavMain()),
      routes: <String, WidgetBuilder>{
        "/root": (BuildContext context) => HomePage(NavMain()),
        "/foo": (BuildContext context) => HomePage(NavFoo()),
      },
    );
  }
}

class HomePage extends StatelessWidget {
  final Widget drawer;

  HomePage(this.drawer);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("App name"),
        elevation: 15,
      ),
      drawer: drawer,
      body: Container(
        child: Center(
          child: Text("home page"),
        ),
      ),
    );
  }
}

class NavMain extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: ListView(
        children: [
          //DrawerHeader(child: null)
          ListTile(
            title: Text("One",
              style: TextStyle(
                fontSize: 32,
              ),
            ),
          ),
          ListTile(
            title: Text("Foo"),
            //trailing: Icon(Icons.),
            //onTap: () => PageDatabase(),// Navigator.of(context).pushNamed("/a"),
            onTap: () {
              Navigator.of(context).pop();
              Navigator.of(context).pushNamed("/foo");
              /*Navigator.of(context).push(MaterialPageRoute(
                builder: (BuildContext context) => HomePage(NavDatabase()),
              ));*/
            },
          ),
          Divider(),
          ListTile(
            title: Text("Information"),
          ),
          ListTile(
            title: Text("Close"),
            onTap: () => Navigator.of(context).pop(),
          ),
          Container(
            alignment: Alignment.bottomLeft,
            child: ListTile(
            title: Text("Back"),
            onTap: () => Navigator.of(context).pushNamed("/root"),
          ),
          ),
        ],
      ),
    );
  }
}

class NavFoo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: ListView(
        children: [
          ListTile(
            leading: Column(
              children: [
                Text("Create"),
              ],
            ),
            //title: Center(child: Text("Create")),
          ),
          ListTile(
            title: Text("Create some"),
          ),
          Divider(thickness: 1.5),
          ListTile(
            title: Center(child: Text("Drop")),
          ),
          ListTile(
            title: Text("Drop some"),
          ),
          ListTile(
            title: Text("Back"),
            onTap: () => Navigator.of(context).pushNamed("/root"),
          ),
        ],
      ),
    );
  }
}