How to prevent MenuButton from closing when clicking on the CheckMenuItem (JavaFX) - javafx

Question

I'm new with Java, I would like to know how to prevent MenuButton popup from closing when I click on the item, I tried the following function, which I found on this site, but does not seem to do anything. I need this in order to make a clone of my C# application whit the purpose of learning Java.
#FXML
private MenuButton menuButton;
#FXML
void initialize() {
CheckMenuItem menuButtonItem1 = new CheckMenuItem("Item 1");
CheckMenuItem menuButtonItem2 = new CheckMenuItem("Item 2");
CheckMenuItem menuButtonItem3 = new CheckMenuItem("Item 3");
menuButtonItem1.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
e.consume();
}
});
menuButtonItem2.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
e.consume();
}
});
menuButtonItem3.setOnAction(new EventHandler<ActionEvent>() {
public void handle(ActionEvent e) {
e.consume();
}
});
}

Answer 1

The CustomMenuItem class provides a setHideOnClick() method that will handle this. In order to use it, you'll wrap a standard Node in this CustomMenuItem:
CheckBox checkBox = new CheckBox("Item 1");
CustomMenuItem customMenuItem = new CustomMenuItem(checkBox);
customMenuItem.setHideOnClick(false);
Below is a full example for you to try:
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.CustomMenuItem;
import javafx.scene.control.MenuButton;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class CheckMenuKeepOpen extends Application {
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) {
// Simple Interface
VBox root = new VBox(10);
root.setAlignment(Pos.CENTER);
root.setPadding(new Insets(10));
// Create the MenuButton
MenuButton menuButton = new MenuButton("Click Me");
for (int i = 0; i < 5; i++) {
// In order to keep the menu open when selecting a CheckBox, we need to wrap it in a CustomMenuItem
CustomMenuItem menuItem = new CustomMenuItem(new CheckBox("Item #" + i));
// This method is pretty obvious; it keeps the menu open when selecting this item.
menuItem.setHideOnClick(false);
menuButton.getItems().add(menuItem);
}
root.getChildren().add(menuButton);
// Show the stage
primaryStage.setScene(new Scene(root));
primaryStage.setTitle("Sample");
primaryStage.show();
}
}

Answer 2

We found using custom menu item would lose the styling of normal menu items. Instead we solved by using a Menu (i.e. a sub menu) with no items in which other than arrows to the right looks identical to a normal menu item but does not close when clicked. Then finally used css to remove the arrow to the right.