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

You can use CGEventSourceSecondsSinceLastEventType

Returns the elapsed time since the last event for a Quartz event source.

/*
 To get the elapsed time since the previous input event—keyboard, mouse, or tablet—specify kCGAnyInputEventType.
 */
- (CFTimeInterval)systemIdleTime
{       
    CFTimeInterval timeSinceLastEvent = CGEventSourceSecondsSinceLastEventType(kCGEventSourceStateHIDSystemState, kCGAnyInputEventType);
    return timeSinceLastEvent;
}