Forward/backward MouseWheel Event in JavaFX?

Question

I found this http://download.java.net/jdk8/jfxdocs/javafx/scene/input/ScrollEvent.html but it is very limited on mouseWheel, and seems to be based on touch. There is ScrollEvent.SCROLL but how do I know if I'm scrolling forward or backwards?
There was nothing in the mouseEvent api, and this is the only information I have....
I rather not have to use AWT events and FX events as that would be ugly, and I'm not too sure if I could run them both on the FX Thread, or if I would need another one(yay for Threads :p).

Answer 1

Yeah. I don't have a mouse with a wheel to test on; just an apple mouse and a trackpad. Both give the expected results for this quick demo. (Put the mouse over the window and scroll, you should see the deltaX and deltaY values reported.) If this gives zeros for deltaX and deltaY I think that's a bug.
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.ScrollEvent;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
public class ScrollWheelTest extends Application {
  @Override
  public void start(Stage primaryStage) {
    final Label scrollWheelStatus = new Label();
    final BorderPane root = new BorderPane();
    root.setTop(scrollWheelStatus);
    root.setOnScroll(new EventHandler<ScrollEvent>() {
      @Override
      public void handle(ScrollEvent event) {
        scrollWheelStatus.setText(String.format("deltaX: %.3f deltaY: %.3f",
            event.getDeltaX(),
            event.getDeltaY()
    primaryStage.setScene(new Scene(root, 600, 400));
    primaryStage.show();
  public static void main(String[] args) {
    launch(args);
}