Best way to know if application is inactive in cocoa mac OSX?

Question

So, i am building a program that will stand on a exhibition for public usage, and i got a task to make a inactive state for it. Just display some random videos from a folder on

Answer 1

This might sound like a silly question; but why not just set up a screensaver, with a short fuse?

You can listen for the NSNotification named @"com.apple.screensaver.didstart" if you need to do any resets or cleanups when the user wanders away.

Edit: You could also set up the screen saver; wait for it to fire, and then do your own thing when it starts, stopping the screen saver when you display your own videos; but setting up a screen saver the proper way is probably a good idea.