javafx scene 위에 popup 띄우기

javafx에서 현재 띄워져 있는 scene위에 popup창 띄우기 소스입니다.

package test;

import java.util.ArrayList;
import java.util.List;
import java.util.Stack;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Popup;
import javafx.stage.Stage;
import javafx.stage.Window;

public class Main2 extends Application {
	private char str = 'A';

	private Stack stack = new Stack<>();
	private Popup popup;
	private List popupList = new ArrayList<>();
	
	@Override
	public void start(Stage primaryStage) {
		try {

			primaryStage.setTitle("popup Test");
			
			Button buttonOpen = new Button();
			buttonOpen.setText("popup Open");
			
			Button buttonClose = new Button();
			buttonClose.setText("popup close");
			
			buttonOpen.setOnAction(e-> {
				openPopup(primaryStage);
			});
			buttonClose.setOnAction(e-> {
				closePopup();
			});
			

			VBox root = new VBox();
			root.getChildren().add(buttonOpen);
			root.getChildren().add(buttonClose);

			Scene scene = new Scene(root, 400, 400);

			primaryStage.setScene(scene);
			primaryStage.show();

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	protected void closePopup() {
		if ( stack != null && stack.size() > 0 ) {
			stack.pop();

			Popup closePopup = popupList.get(stack.size());
			popupList.remove(stack.size());
			closePopup.hide();
			
		}
	}

	public static void main(String[] args) {
		launch(args);
	}
	
	public void openPopup(Stage stage) {
		popup = new Popup();
		 
		if(popup.isShowing()){
			popup.hide();
		}else {
			Scene scene = stage.getScene();
			Window window = scene.getWindow();
			
			popup.getContent().clear();
			popupList.add(popup);
			
			Label label = new Label(String.valueOf(str++));
			label.setStyle("-fx-font-size:30");
			label.setLayoutX(Math.random()*500);
			label.setLayoutY(Math.random()*500);
			stack.push(label);
			
			popup.getContent().addAll(label);
			
			Platform.runLater(new Runnable() {
				
				@Override
				public void run() {
					popup.show(window);
				}
				
			});
		}
	}
}

번외 - fxml 로더로 창 띄우기

FXMLLoader loader;
Parent parent = null;
loader = new FXMLLoader(Class.class.getClass().getResource("/dra/common/view/common_POPUP_default.fxml"));//FIXME 재사용 가능 여부 검토.
ResourceBundle rb = ResourceBundle.getBundle("bundles.message", new UTF8Control());
loader.setResources(rb);