custom_semantics.dart

      ListView.builder(
        itemCount: 5,
        itemBuilder: (context, position) {
          return Semantics(
            label: 'Container with 200 width 200 height and red background',
            enabled: position == 1 ? true : false,
            selected: position == 0 ? true : false,
            onTap: () {
              Scaffold.of(context).showSnackBar(SnackBar(content: Text('Item $position Clicked!')));
            },
            onScrollDown: (){
              print('Scroll down happened');
            },
            child: Container(
              margin: EdgeInsets.all(16),
              color: Colors.red,
              height: 200,
              width: 200,
            ),
          );
        },
      )