如何开启透明AnchorPane的拖拽功能？

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class DraggableAnchorPane extends Application {

    private double dragOffsetX = 0;
    private double dragOffsetY = 0;

    @Override
    public void start(Stage primaryStage) {
        AnchorPane anchorPane = new AnchorPane();
        anchorPane.setStyle("-fx-background-color: #f0f0f0;");

        // 添加鼠标按下事件处理器
        anchorPane.setOnMousePressed(event -> {
            dragOffsetX = event.getSceneX() - anchorPane.getLayoutX();
            dragOffsetY = event.getSceneY() - anchorPane.getLayoutY();
        });

        // 添加鼠标拖动事件处理器
        anchorPane.setOnMouseDragged(event -> {
            anchorPane.setLayoutX(event.getSceneX() - dragOffsetX);
            anchorPane.setLayoutY(event.getSceneY() - dragOffsetY);
        });

        Scene scene = new Scene(anchorPane, 800, 600);
        primaryStage.setScene(scene);
        primaryStage.setTitle("Draggable AnchorPane");
        primaryStage.show();
    }

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