gtk:scrolled-window-policy (window)

window -- a gtk:scrolled-window widget
hpolicy -- a value of the gtk:policy-type enumeration for the policy of the horizontal scrollbar
vpolicy -- a value of the gtk:policy-type enumeration for the policy of the vertical scrollbar

The gtk:scrolled-window-policy function retrieves the current policy values for the horizontal and vertical scrollbars. The (setf gtk:scrolled-window-policy) function sets the scrollbar policy.

The policy determines when the scrollbar should appear. It is a value from the gtk:policy-type enumeration. If :always, the scrollbar is always present. If :never, the scrollbar is never present. If :automatic, the scrollbar is present only if needed, that is, if the slider part of the scrollbar would be smaller than the trough - the display is larger than the page size.