The function docking-layout-pane-visible-p
returns a boolean indicating whether
pane
is currently visible in the Docking Group of
docking-layout
.
pane
may be docked in any member of the Docking Group, or undocked.
(setf docking-layout-pane-visible-p)
may be used to change the visibility of pane in
docking-layout
only when
pane
is dockable in the Docking Group of
docking-layout
, that is, it was added to the
items
of any of the docking-layouts in the group.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017