Add KeyEvent for calculator numpad in JavaFX using MVC - javafx

Question

I created in Eclipse a simple calculator using JavaFx and MVC pattern. I would like to add keylisteners in order to press the buttons of my calculator by simply pressing the buttons in my keyboard. I tried to add #onKeyPress in SceneBuilder and then a method onKeypress (with some coding inside) in my Controller class but nothing happens.Could you please give some general instructions how to implement something like this? Thanks!

Answer 1

Thanks for your comments. I added the following code snippet in App.java:
scene.setOnKeyReleased(new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent event) {
controller.numFromKeyboard(event.getCode().toString());
}
});
And also, I had to add:
Parent root = loader.load();
Controller controller = loader.getController();
// The above line MUST be
// inserted after root is loaded in order the controller of my
// app to be instantiated,
// otherwise we will get a null exception when handler will be
// invoked
App.java
public class App extends Application {
//controller = new Controller();
#Override
public void start(Stage primaryStage) {
try {
// Read file fxml and draw interface.
FXMLLoader loader = new FXMLLoader(getClass()
.getResource("/application/View.fxml"));
Parent root = loader.load();
Controller controller = loader.getController();
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("/application/application.css").toExternalForm());
Image icon = new Image(getClass().getResourceAsStream("/application/Assets/App.png"));
primaryStage.getIcons().add(icon);
primaryStage.setTitle("JavaFX Calculator by Dimitris Baltas");
primaryStage.setScene(scene);
primaryStage.setResizable(false);
primaryStage.show();
scene.setOnKeyReleased(new EventHandler<KeyEvent>() {
#Override
public void handle(KeyEvent event) {
controller.numFromKeyboard(event.getCode().toString());
}
});
} catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}