fullclass

class Home extends StatefulWidget {
  @override
  _Home createState() => _Home();
}

class _Home extends State<Home> {
  Color primary = const Color(0xFF292B2C);

  List<Widget> pageList = List<Widget>();
  int _selectedPage = 0;

  double previousScrollOffset = 50.0;

  ScrollController _controller;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();



    _controller = ScrollController( initialScrollOffset: previousScrollOffset);

    _controller.addListener(() {

        if (_controller.position.atEdge) {
          if (_controller.position.pixels == 0) {
            // you are at the top
            print('You are at the top');
          } else {
            //bottom
//            previousScrollOffset = _controller.offset;
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => CustomSwipeDownPage()),
            );
          }
        }

    });
  }

  @override
  void dispose() {
    // TODO: implement dispose
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    pageList.add(_firstPage(_controller));
    pageList.add(Container());
    pageList.add(Container());
    pageList.add(Container());
    pageList.add(ProfilePage());

    return Scaffold(
      body: IndexedStack(
        index: _selectedPage,
        children: pageList,
      ),
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        items: const <BottomNavigationBarItem>[
          BottomNavigationBarItem(
            icon: Icon(Icons.home, color: Colors.white),
            title: Text(''),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.bookmark, color: Colors.white),
            title: Text(''),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.search, color: Colors.white),
            title: Text(''),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.notifications, color: Colors.white),
            title: Text(''),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person, color: Colors.white),
            title: Text(''),
          ),
        ],
        currentIndex: _selectedPage,
        onTap: (int index) {
          setState(() {
            _selectedPage = index;
          });
        },
        selectedItemColor: Colors.amber[800],
        backgroundColor: primary,
      ),
    );
  }

  Widget _firstPage(ScrollController scrollController) {
    return Container(
      child: ListView(
        controller: scrollController,
        children: <Widget>[
          TopStory(),
          Container(
            child: CardSlider(),
            color: Colors.grey[900],
          ),
          Material(child: MoreCategoriesPage()),
        ],
      ),
    );
  }