How to know if a NSWindow is fullscreen in Mac OS X Lion?

Question

I guess I should check if [NSApplication presentationOptions] contains NSFullScreenModeApplicationPresentationOptions, but how do I achieve that?

Answer 1

You need to use an & bitwise operator to test that that option is being used. Not tested but probably something like this:

- (BOOL) inFullScreenMode {
    NSApplicationPresentationOptions opts = [[NSApplication sharedApplication ] presentationOptions];
    if ( opts & NSApplicationPresentationFullScreen) {
       return YES;
    }
    return NO;
}

To see if any of your windows are in full screen mode simply check the style mask of the window.

NSUInteger masks = [someNSWindow styleMask]
if ( masks & NSFullScreenWindowMask) {
 // Do something
}