Flutter - Как реализовать в коде свайп меню?

import 'package:flutter/material.dart';
import 'package:curved_navigation_bar/curved_navigation_bar.dart';
import 'package:flutterapp/pages/favorite.dart';
import 'package:flutterapp/pages/game.dart';
import 'package:flutterapp/pages/rhv.dart';
import 'package:flutterapp/pages/tvorchestvo.dart';
import 'pages/home.dart';

void main() => runApp(MaterialApp(home: BottomNavBar()));

class BottomNavBar extends StatefulWidget {
  @override
  _BottomNavBarState createState() => _BottomNavBarState();
}

class _BottomNavBarState extends State<BottomNavBar> {
  int pageIndex = 0;

  final Home _home = Home();
  final Game _game = Game();
  final Favorite _favorite = Favorite();
  final Rhv _rhv = Rhv();
  final Tvorchestvo _tvorchestvo = Tvorchestvo();

  Widget _showPage = new Home();

  Widget _pageChooser(int page){
    switch(page){
      case 0:
        return _home;
        break;
      case 1:
        return _game;
        break;
      case 2:
        return _favorite;
        break;
      case 3:
        return _tvorchestvo;
        break;
      case 4:
        return _rhv;
            break;
      default:
        return new Container(
              child: new Center(
                child: new Text(
                  'No',
                  style: new TextStyle(fontSize:30),
                ),
                ),
              );
           }
  }

  GlobalKey _bottomNavigationKey = GlobalKey();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        bottomNavigationBar: CurvedNavigationBar(
          key: _bottomNavigationKey,
//          initialindex: pageIndex,
          height: 50.0,
          items: <Widget>[
            Icon(Icons.home, size: 30, color: Colors.white),
            Icon(Icons.list, size: 30, color: Colors.white),
            Icon(Icons.favorite, size: 30, color: Colors.white),
            Icon(Icons.call_split, size: 30, color: Colors.white),
            Icon(Icons.perm_identity, size: 30, color: Colors.white),
          ],
          color: Colors.deepOrange,
          buttonBackgroundColor: Colors.deepOrange,
          backgroundColor: Colors.white,
          animationCurve: Curves.easeInOut,
          animationDuration: Duration(milliseconds: 600),
          onTap: (int tappedIndex) {
            setState(() {
              _showPage = _pageChooser(tappedIndex);
            });
          },
        ),
        body: Container(
          color: Colors.white,

          child: Center(
            child: Column(
              children: <Widget>[
//                Text(_page.toString(), textScaleFactor: 10.0),
                RaisedButton(
//                  child: Text('Go To Page of index 1'),
                child: _showPage,
                  onPressed: () {
                    final CurvedNavigationBarState navBarState =
                        _bottomNavigationKey.currentState;
                    navBarState.setPage(1);
                  },
                )
              ],
            ),
          ),
        ));
  }
}