带有底部抽屉导航的颤振底部导航栏

Question

我需要导航抽屉和底部导航，所以我确实在项目中添加了自定义导航抽屉，也确实添加并显示了底部导航栏，但是我面临的问题是我只能显示它，但无法设置它的onTap功能并在页面之间导航。作为参考，我确实粘贴了示例代码。

class SideBarLayout extends StatelessWidget {
  int _currentIndex = 0;
  List<Widget> _tab_list =[

  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: BlocProvider<NavigationBloc>(
        create: (context) => NavigationBloc(),
        child: Stack(
          children: <Widget>[
            BlocBuilder<NavigationBloc, NavigationStates>(
              builder: (context, navigationState) {
                return navigationState as Widget;
              },
            ),
            SideBar(),
          ]
        ),
      ),
      bottomNavigationBar: BottomNavigationBar(
        onTap: (currentIndex){
          _currentIndex = currentIndex;

        },
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.home),
            title: Text('Home'),
            backgroundColor: Color(0xFF478DE0),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.assignment),
            title: Text('Quotation'),
            backgroundColor: Color(0xFF478DE0),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.attach_money),
            title: Text('Payments'),
            backgroundColor: Color(0xFF478DE0),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            title: Text('Profile'),
            backgroundColor: Color(0xFF478DE0),
          ),
        ],
      ),
    );
  }
}