sliverAppBar.dart

class _HomeBodyScreenState extends State<HomeBodyScreen> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: UIColorHelper.LIGHT_COLOR,
      body: _body,
    );
  }

  Widget get _body =>
      CustomScrollView(slivers: <Widget>[_sliverAppBar, _sliverFillRemaing]);

  Widget get _sliverAppBar => SliverAppBar(
        backgroundColor: UIColorHelper.LIGHT_COLOR,
        flexibleSpace: FlexibleSpaceBar(
          title: Text(
            'LOGO',
            style: TextStyle(
              color: UIColorHelper.PRIMARY_COLOR,
              fontWeight: FontWeight.bold,
              fontSize: 60,
            ),
          ),
          centerTitle: true,
        ),
        expandedHeight: 350.0,
        floating: true,
        pinned: true,
        snap: true,
        elevation: 5.0,
        shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.vertical(bottom: Radius.circular(30))),
      );

  Widget get _sliverFillRemaing => SliverFillRemaining();
}