"Veronika Irvine" <[EMAIL PROTECTED]> writes:
> To allow a widget to participate as a drag source I have two options
> 1) gtk_drag_source_set and 2) gtk_drag_begin.
>
> What I want to be able to do is when the conditions are right for a drag
> to begin, I want to check if I indeed want to perform a drag (e.g. do I
> have anything selected to drag).
> If I have nothing to drag, I do not want to proceed.
>
> As far as I can gather, if I use gtk_drag_source_set I will be notified
> in my drag_begin callback that the conditions for a drag to start have
> been met. But I can see no way in the drag_begin callback to abort the
> operation (in fact calling gdk_drag_abort does not work and there is no
> return value to indicate failure).
>
> Alternatively, I can detect that a DND operation may begin and then call
> gtk_drag_begin but since the user can possibly configure the timing,
> button used, distance moved etc I really can't do a good job of figuring
> out when the DND operation may begin.
You need to go this route; the only thing that is configurable is
the distance moved, which is encapsulated in:
gboolean gtk_drag_check_threshold (GtkWidget *widget,
gint start_x,
gint start_y,
gint current_x,
gint current_y);
Regards,
Owen
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