How not to start a drag process.

[Dominik Smogor <duce math put poznan pl>]

I'm just wondering ...
Is it possible to have additional conditions on whether to start DND
process in GTK+? I mean that I only know how to make a windowed widget a
permanent drag source, but what I'd like to do is to allow it start DND
(drag) depending on ,say, actual cursor position (making some kind of
in-widget sites user can drag from).

By the way. Are there any docs/info on Gtk+ DND. URL's I found in list
archives seems to be not existant and api docs on developer.gnome.org are
partially empty. 

I'll appreciate any hints. Thanks.
DS