Samle_Flow.dart

return Scaffold(
    appBar: AppBar(title: Text('Flow Layout Flutter')),
    body: Center(
    child: Container(
        color: Colors.teal,
        child: Flow(
        delegate: SampleFlowDelegate(),
        children: <Widget>[
            buildItem(0),
            buildItem(1),
            buildItem(2),
            buildItem(3),
            buildItem(4),
            buildItem(5),
            buildItem(6),
        ],
        ),
     ),
   ),
);