C#自制的QQ窗体源码，可伸缩于屏幕顶部，将它拖动至屏幕上方时，它就会自动隐藏到屏幕的顶部边缘，当鼠标放上去的时候，它会自动伸展出来，就和QQ的主窗口是一样的效果-C# homemade QQ source form, scalable at the top of the screen, drag it to the top of the screen, it will automatically hide the top edge of the screen when the mouse is