drop-object-allows-drop-effect-p returns non-nil if the dropping operation can be performed with the given effect
. It returns
nil if the dropping operation cannot be performed. See drop-object-drop-effect for information on drop effect keywords.
drop-object-allows-drop-effect-p should only be called within a
. It is not supported on X11/Motif. See simple-pane for information about drop callbacks.
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017