JavaFX 将鼠标事件添加到ARC中

import javafx.application.Application;
 import javafx.event.EventHandler;
 import javafx.scene.Group;
 import javafx.scene.Scene;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.paint.Color;
 import javafx.scene .shape.Arc;
 import javafx.scene.shape.ArcBuilder;
 import javafx.scene.shape.ArcType;
 import javafx.stage.Stage; public class Main extends Application {
     public static void main(String[] args) { 
        Application.launch (args); 
    } 
    @Override public void start(Stage primaryStage) { 
        Group root = new Group(); 
        Scene scene = new Scene(root, 551, 400, Color.BLACK); 
        Group buttonGroup = new Group(); 
        Arc leftButton = ArcBuilder.create() 
                .type(ArcType.ROUND) 
                .centerX(12) 
                .centerY(16) 
                .radiusX(15) 
                .radiusY(15) 
                .startAngle(-30) 
                .length(60) 
                .fill( new Color( 1,1,1, .90)) 
                .build(); 
        leftButton.addEventHandler(MouseEvent.MOUSE_PRESSED, new EventHandler<MouseEvent>() {
             public void handle(MouseEvent me) {                 
              System.out.println( \"left\" ); 
            } 
        }); 
        buttonGroup.getChildren().add(leftButton); 
        root.getChildren().add(buttonGroup); 
        primaryStage.setScene(scene); 
        primaryStage.show(); 
    } 
}