@override

  void initState() {

    super.initState();

    // Prevent default event handler

    document.onContextMenu.listen((event) => event.preventDefault());

  }

@override

  Widget build(BuildContext context) {

    return Scaffold(

      resizeToAvoidBottomInset: false,

      body: Center(

        child: Listener(

          child: Icon(

            Icons.ac_unit,

            size: 48.0,

          ),

         onPointerDown: (PointerDownEvent details) {
  onPointerDown(details,widget.baseData.getTitle());
},

        ),

      ),

    );

  }

/// Callback when mouse clicked on `Listener` wrapped widget.
Future<void> onPointerDown(PointerDownEvent event, String text) async {
  // Check if right mouse button clicked
  if (event.kind == PointerDeviceKind.mouse &&
      event.buttons == kSecondaryMouseButton) {
    final overlay =
        Overlay.of(context)!.context.findRenderObject() as RenderBox;
    final menuItem = await showMenu<int>(
        context: context,

        items: [
          PopupMenuItem(child: Text('Copy'), value: 1),
          PopupMenuItem(child: Text('Cut'), value: 2),
        ],
        position: RelativeRect.fromSize(
            event.position & Size(48.0, 48.0), overlay.size));
    // Check if menu item clicked
    switch (menuItem) {
      case 1:
        mesajYaz("kopyalandi "+text);
        break;
      case 2:
        mesajYaz("kesildi "+text);
        break;
      default:
    }
  }
}