Problem Keypressed Javafx

Question

I wanted to fire an event by pressing the F12 button, but I’m not able to make it fire any action even having created it in code. Here is an example below.

F12.setOnKeyPressed(event -> {
    if(event.getCode().equals(KeyCode.F12)){
        System.out.println("NN");
    }
});

Answer 1

This happened because you haven’t defined what kind of event you’re dealing with, it can be done like this:

public class ButtonTest extends Application{

private Button mybutton;

@Override
public void start(Stage primaryStage) throws IOException {

    VBox root = new VBox(5);
    root.setAlignment(Pos.CENTER);

    mybutton = new Button();
    mybutton.setDefaultButton(true);
    mybutton.setOnKeyPressed((KeyEvent t) -> {
        if(t.getCode() == KeyCode.F12){
            System.out.println("F12");
        }
        if(t.getCode() == KeyCode.SPACE){
            t.consume();
        }
    });
    mybutton.setOnAction(new EventHandler<ActionEvent>() {
        @Override
        public void handle(ActionEvent t) {
            System.out.println("Fired");
        }
    });

    root.getChildren().addAll(mybutton);

    Scene scene = new Scene(root,500,400);
    primaryStage.setScene(scene);
    primaryStage.show();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}

Or using Lambdas:

Button mybutton = new Button();
mybutton.setOnKeyPressed((KeyEvent t) -> {
    if(t.getCode() == KeyCode.F12){
        System.out.println("F12");
    }
});

You can also use this code to consume an event you don’t want to happen this way:

if(t.getCode() == KeyCode.SPACE){
    t.consume();
}

No problem a same button have a setOnAction and a setOnKeyPressed.