The function
drop-object-provides-format
returns non-
nil
if the dropping operation can provide an object in the given format. It returns
nil
if it cannot provide that format.
See set-drop-object-supported-formats for information on format keywords.
Note:
drop-object-provides-format
should only be called within a
drop-callback
. It is not supported on X11/Motif. See simple-pane for information about drop callbacks.