how to perform any task on clicking main menubutton - javafx

Question

I have a menu heading, on clicking on which sub menu items are displayed. The set on action function is working for the sub menu items but not for the main menu. I wanted to perform some task on just clicking on the main menu along with the drop down list of sub menu items. Please Help.

Answer 1

Here's an example about how to catch events for the menu, the submenu and the menu items:
public class MenuActionDemo extends Application {
public static void main(String[] args) {
Application.launch(args);
}
#Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Menus");
Group root = new Group();
Scene scene = new Scene(root, 300, 250, Color.WHITE);
MenuBar menuBar = new MenuBar();
// main menu item
Menu menu = new Menu("Item");
menu.showingProperty().addListener(new ChangeListener<Boolean>() {
#Override
public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
if( newValue) {
System.out.println( "Main menu item showing");
} else {
System.out.println( "Main menu item closing");
}
}
});
// sub menu
Menu subMenu = new Menu("Submenu");
subMenu.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
if( event.getTarget() == subMenu) {
System.out.println("Submenu clicked");
}
}
});
// sub menu item
MenuItem menuItem = new MenuItem("Submenu Item 1");
menuItem.setOnAction(new EventHandler<ActionEvent>() {
#Override
public void handle(ActionEvent event) {
System.out.println("Submenu Item 1 clicked");
}
});
subMenu.getItems().add(menuItem);
// add items to main menu
menu.getItems().add(subMenu);
menuBar.prefWidthProperty().bind(primaryStage.widthProperty());
menuBar.getMenus().add(menu);
root.getChildren().add(menuBar);
primaryStage.setScene(scene);
primaryStage.show();
}
}