Gets and sets the expanded state of an item in a tree-view.
The generic function tree-view-expanded-p
is the predicate for whether
item
is expanded in
tree-view
. If item is not in
tree-view
, the function returns nil
.
(setf tree-view-expanded-p)
sets the expanded state of
item
in
tree-view
to
value
. If
item
is not in
tree-view
, the function does nothing.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017