续上面的代码，以下是DragWindowHandler类的构造方法和设置拖拽事件的方法：
public DragWindowHandler(Stage primaryStage){this.primaryStage = primaryStage;}public void enableDrag(){primaryStage.getScene().setOnMousePressed(event -> {oldStageX = primaryStage.getX();oldStageY = primaryStage.getY();oldScreenX = event.getScreenX();oldScreenY = event.getScreenY();});primaryStage.getScene().setOnMouseDragged(event -> {double deltaX = event.getScreenX() - oldScreenX;double deltaY = event.getScreenY() - oldScreenY;primaryStage.setX(oldStageX + deltaX);primaryStage.setY(oldStageY + deltaY);});}
构造方法接收一个Stage对象，表示需要实现拖拽功能的窗口。enableDrag()方法用于启用窗口的拖拽功能，在该方法中为窗口添加鼠标按下和鼠标移动事件监听器。当鼠标按下时，记录下当前窗口的坐标和鼠标在屏幕上的坐标；当鼠标移动时，计算出鼠标在屏幕上移动的距离，并根据这个距离更新窗口的位置。通过这种方式实现了窗口拖拽功能。
![[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.](https://linuxcpp.0voice.com/zb_users/upload/2023/05/202305162234452257235.png)
