通过两个WPF用户控件实现折叠菜单功能，通过折叠控件的尺寸改变触发事件使折叠控件的大小在窗体放大或缩小时都是合适的大小(The function of the folding menu is realized through two WPF user controls, and the size of the foldable controls can change the triggering event to make the size of the folding control larg