Make menubar call method when it is clicked? - menu

Question

I am wanting to add an empty javafx.scene.control.Menu to a MenuBar and have it call a method when it is clicked.
I have tried using menu.setOnShowing(new EventHandler<Event>(){}); with no luck.
Here is what I am currently working with:
public MenuBar createMenuBar() {
MenuBar menuBar = new MenuBar();
Menu file = new Menu("File");
Menu addAccountTab = new Menu("Add Tab");
addAccountTab.setOnShowing(new EventHandler<Event>() {
public void handle(Event e) {
System.out.println("addAccountTab Menu clicked.");
}
});
menuBar.getMenus().add(addAccount);
return menuBar;
}
However, clicking the Menu does not call the onShowing event.

Answer 1

Your Menu needs to contain at least one MenuItem for the event to fire.
public class MenuApplication extends Application {
#Override
public void start(Stage primaryStage) {
MenuBar menuBar = new MenuBar();
Menu file = new Menu("File");
Menu addAccountTab = new Menu("Add Tab");
addAccountTab.setOnShowing(new EventHandler<Event>() {
#Override
public void handle(Event e) {
System.out.println("addAccountTab Menu clicked.");
}
});
MenuItem NewMenuItem = new MenuItem("New");
addAccountTab.getItems().add(NewMenuItem);
menuBar.getMenus().addAll(file, addAccountTab);
StackPane root = new StackPane();
root.getChildren().add(menuBar);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
The output I get is shown below:

Answer 2

Although the API suggests otherwise, the onShowing event doesn't get called when there are no MenuItems in the Menu or when they are all hidden.
I was able to solve the issue by using Menu's hide() method inside of the onShown event like this.
public MenuBar createMenuBar() {
MenuBar menuBar = new MenuBar();
Menu addAccount = MenuBuilder.create()
.onShown(new EventHandler<Event>() {
public void handle(Event e) {
((Menu)e.getSource()).hide();
System.out.println("addAccount Clicked");
}
}).items(new MenuItem())
.text("Add Account").build();
menuBar.getMenus().addAll(addAccount);
return menuBar;
}