Disabling red 'X' button from closing entire JavaFX program w/ Java8? - button

Question

I'm running into a bit of a problem. I'm creating a program for a client. In the program, I have implement a dedicated 'close/shut down' button - which requires a password in order to properly shut down. But an alternative (and less safe) way of closing the program is by hitting the red close or 'X' button: top right (Windows) or top left(Mac).
I do not want the red x button to actually close the entire program. What I would like to know: is it possible to completely disable the red 'x' button from closing the entire program? If possible, could someone provide code for this?
What I'm using: IntelliJ IDEA (Ultimate), JavaFX with Java 8, Dev. Language: Java

Answer 1

Add a event handler to the onCloseRequest event of the stage. This allows you to prevent the window from closing by consuming the event and executing your own shutdown procedure instead:
private void shutdown(Stage mainWindow) {
// you could also use your logout window / whatever here instead
Alert alert = new Alert(Alert.AlertType.NONE, "Really close the stage?", ButtonType.YES, ButtonType.NO);
if (alert.showAndWait().orElse(ButtonType.NO) == ButtonType.YES) {
// you may need to close other windows or replace this with Platform.exit();
mainWindow.close();
}
}
#Override
public void start(Stage primaryStage) {
primaryStage.setOnCloseRequest(evt -> {
// prevent window from closing
evt.consume();
// execute own shutdown procedure
shutdown(primaryStage);
});
StackPane root = new StackPane();
Scene scene = new Scene(root, 100, 100);
primaryStage.setScene(scene);
primaryStage.show();
}