JavaFX: Window closing event prevents button action - button

Question

I did implement a popup window in a new stage and I'm now trying to close it, no matter where I click (excluding the popup itself). This works just fine. Although the popup windows disappears when I click on another element (e.g. a button) on the background, I'd still like to get the event for the button. Any suggestions on how to achieve this? I put together a short example of the situation.
package application;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.Pane;
public class Main extends Application {
#Override
public void start(Stage primaryStage) {
try {
BorderPane root = new BorderPane();
Scene scene = new Scene(root, 400, 400);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
// the popup
Pane p = new Pane();
p.setPrefSize(100, 100);
p.setStyle("-fx-background-color: #660066");
final Stage popUp = new Stage();
Scene popUpScene = new Scene(p);
popUp.setScene(popUpScene);
Button btnShow = new Button("Show popUp");
root.setCenter(btnShow);
btnShow.setOnMouseClicked(new EventHandler<Event>() {
#Override
public void handle(Event event) {
ChangeListener stageFocusListener = new ChangeListener<Boolean>() {
#Override
public void changed(ObservableValue<? extends Boolean> arg0, Boolean oldPropertyValue, Boolean newPropertyValue) {
if (!newPropertyValue) {
popUp.hide();
}
}
};
popUp.focusedProperty().addListener(stageFocusListener);
popUp.show();
}
});
Button btnTest = new Button("test");
root.setRight(btnTest);
btnTest.setOnMouseClicked(new EventHandler<Event>() {
#Override
public void handle(Event event) {
System.out.println("Button test clicked");
}
});
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}

Answer 1

You can put the hiding event to the queue without disturbing the event handling procedure of the button
if (!newPropertyValue) {
Platform.runLater(new Runnable() {
#Override
public void run() {
popUp.hide();
}
});
}