import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class TestMouseMove extends Application {

    public static void main(String[] args) throws Exception {
        launch(args);
    }

    @Override
    public void start(final Stage stage) {
        stage.initStyle(StageStyle.TRANSPARENT);
        Region root = new Region();
        root.setPrefSize(400, 400);
        root.addEventHandler(MouseEvent.MOUSE_MOVED, new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                System.out.println("Mouse moved");
            }
        });
        root.setStyle("-fx-border-color: grey; -fx-border-width: 2");
        Scene scene = new Scene(root);
        scene.setFill(null);
        stage.setScene(scene);
        stage.show();
    }
}