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

For Swift 3.0

if let window = NSApp.mainWindow {
    let isWindowFullscreen = window.styleMask.contains(NSFullScreenWindowMask)
}

Obviously, for the original question, you'd replace NSApp.mainWindow with whichever document window you're wanting to check.