unsetting drag icon set via gtk_drag_source_set_icon()?

[Murray Cumming <murrayc murrayc com>]

I don't know how to undo the effects of gtk_drag_source_set_icon(), 
http://developer.gnome.org/doc/API/gtk/gtk-drag-and-drop.html#GTK-DRAG-SOURCE-SET-ICON
but maybe someone on gtk-list knows, so I'm CCing them. I guess that
gtk_drag_source_unset() (Gtk::Widget::drag_source_unset()) does
something slightly different.

On Fri, 2006-11-10 at 15:16 +0100, Toralf Lund wrote:
> In one of my Gtkmm applications (using version 2.4.7), I'm setting up a 
> "drag source icon" using 
> Gtk::Widget::drag_source_set_icon(Glib::RefPtr<Gdk::Colormap> &, 
> Glib::RefPtr<Gdk::Pixmap>&, Glib::RefPtr<Gdk::Bitmap>&);
> 
> This seems to work fine, but I also want to uninstall the icon some time 
> later, and can't figure out how. That is, what I've tried to do, is to 
> replace the pixmap/bitmap combination with a stock icon using another 
> variant of the above mentioned method. I think this also works in the 
> sense that the visible icon changes. However, when looking a bit closer 
> at the objects involved, I notice that my pixmap and bitmap will not be 
> unreferenced by this operation, i.e. their ref_count remain the same 
> after this second drag_source_set_icon(), and the resources do not get 
> freed as appropriate.
> 
> Is there another way to uninstall or unreference a pixmap/bitmap used as 
> drag source icon?
> 
> On a somewhat related note, I'm also looking for a nice and simple way 
> to render 1-bit data to a Gtk::Pixbuf, as this would be allow me to use 
> another variant of the set method - one that's actually recommended by 
> the manual... Help, anyone?
> 
> - Toralf
> 
> 
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-- 
Murray Cumming
murrayc murrayc com
www.murrayc.com
www.openismus.com