Re: "drag_begin" signal behavior

[Owen Taylor <otaylor redhat com>]

Maxim Koshelev <mdem chat ru> writes:

> Hi there,
> I'was writting some code to implement DnD from one widget to another
> but I've found one problem there:
> I can't stop DnD when it begun.
> Example:
> I need to drag some strings from on list to another (all work fine),
> but it's invalid to allow dragging when selection in source list is empty!
>
> Any attempts to call gtk_drag_finish(context,...) from "drag_begin"
> signal handler caused "Bad atom" error and exiting.
>
> Any ideas to forbid DnD when selection is empty?

Don't use gtk_drag_source_set(), instead call gtk_drag_begin()
yourself. 

Alternatively, you could remove the drag source when there is
nothing to drag with gtk_drag_source_unset().

Regards,
                                        Owen