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我正在开发一个原理图编辑器，我需要在中键按下并移动时隐藏光标，并在鼠标向上事件发生时再次显示以实现用户友好的缩放系统。当从这些事件处理程序外部调用隐藏和显示方法时，它们工作正常，然后在事件处理程序内调用时，bud 不起作用！