gtk-header-bar-has-subtitle (object)

object -- a gtk-header-bar widget
setting -- true to reserve space for a subtitle

Accessor of the has-subtitle slot of the gtk-header-bar class.

The gtk-header-bar-has-subtitle slot access function retrieves whether the header bar reserves space for a subtitle, regardless if one is currently set or not. The (setf gtk-header-bar-has-subtitle) slot access function sets whether the header bar should reserve space for a subtitle.