gtk-window-is-maximized (object)

object -- a gtk-window widget
maximized -- a boolean whether the window has a maximized state

Accessor of the is-maximized slot of the gtk-window class.

Note that since maximization is ultimately handled by the window manager and happens asynchronously to an application request, you should not assume the return value of this function changing immediately, or at all, as an effect of calling the gtk-window-maximize or gtk-window-unmaximize functions.