home_view_large.dart

class HomeViewLarge extends StatefulWidget {
  final int currentIndex;
  /// Callback function
  final Function(int selectedIndex) onTapped;
  HomeViewLarge(this.currentIndex, this.onTapped);

  @override
  _HomeViewLargeState createState() => _HomeViewLargeState();
}

class _HomeViewLargeState extends State<HomeViewLarge> {
  int _index = 0;

  @override
  void initState() {
    super.initState();
    _index = widget.currentIndex;
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          Expanded(
            flex: 2,
            child: MenuWidget(
              selectedIndex: _index,
              onTapped: (selectedIndex) {
                setState(() {
                  _index = selectedIndex;
                  // Invoking the callback
                  widget.onTapped(_index);
                });
              },
            ),
          ),
          // ...
        ],
      ),
    );
  }
}