问题
My goal is to create a glass window. I don't know if it has another name, but I'll try to describe precisely what I want to archive. This window would be empty (full transparency), at the foreground, and the user could click through and do his stuff like always. Like a literal glass between the screen and the user.
My final goal is make that old prank where someone get surprised by a image flashing out of nowhere.
I looked upon SFML, QT, Pygame, some Java things, but couldn't find a way. I also thought about playing with the focus, and keeping an empty window at the background, and moving it forward, but once again I didn't find anything.
I am open to any lib/Language/idea.
来源：https://stackoverflow.com/questions/62350751/how-do-i-make-a-glass-window