Detecting fullscreen on Mac

Question

I am writing an IM client for Mac (in Python, but an Objective C / Cocoa solution here is fine). I want to detect whether or not the user is currently watching a movie or playin

Answer 1

The two solutions posted so far apply to “real” full-screen, but it’s worth noting that many full-screen apps just put a window over the whole screen (or, as vasi points out, a whole screen). To be accurate, you’ll have to check both.