如何在JavaFx中当运动改变方向时触发事件

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {
    
    private boolean isMovingUp = false;
    private boolean isMovingDown = false;
    private boolean isMovingLeft = false;
    private boolean isMovingRight = false;
    
    @Override
    public void start(Stage primaryStage) {
        Button button = new Button("Move");
        button.setOnAction(e -> {
            // 在这里处理运动方向改变时的事件
            if (isMovingUp) {
                System.out.println("向上移动");
            } else if (isMovingDown) {
                System.out.println("向下移动");
            } else if (isMovingLeft) {
                System.out.println("向左移动");
            } else if (isMovingRight) {
                System.out.println("向右移动");
            }
        });
        
        // 监听键盘按下事件，改变运动方向的标志位
        button.setOnKeyPressed(e -> {
            switch (e.getCode()) {
                case UP:
                    isMovingUp = true;
                    break;
                case DOWN:
                    isMovingDown = true;
                    break;
                case LEFT:
                    isMovingLeft = true;
                    break;
                case RIGHT:
                    isMovingRight = true;
                    break;
                default:
                    break;
            }
        });
        
        // 监听键盘释放事件，恢复运动方向的标志位
        button.setOnKeyReleased(e -> {
            switch (e.getCode()) {
                case UP:
                    isMovingUp = false;
                    break;
                case DOWN:
                    isMovingDown = false;
                    break;
                case LEFT:
                    isMovingLeft = false;
                    break;
                case RIGHT:
                    isMovingRight = false;
                    break;
                default:
                    break;
            }
        });
        
        StackPane root = new StackPane();
        root.getChildren().add(button);
        Scene scene = new Scene(root, 300, 200);
        
        primaryStage.setTitle("JavaFx Motion Event");
        primaryStage.setScene(scene);
        primaryStage.show();
        
        // 让按钮获取焦点，以便监听键盘事件
        button.requestFocus();
    }

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