Re: Restricting possible connections

[ml <ml knorke in-berlin de>]

On Thu, Oct 24, 2002 at 12:21:22PM -0500, Lars Clausen wrote:
> On Thu, 24 Oct 2002, ml@knorke.in-berlin.de wrote:
> > 2. Of course, this must be an option to the user.  Maybe a
> >    diagram specific or a global option?
> 
> Hmmm... good question.  Global options are easier to make and do away
> with.  I really don't know which is better.

Let's go for a global option first, and make it more
advanced if the need is there.  Other idea: Allow user
the connection always if a modifier key is used (Escape/
Meta/Alt/Control/Shift).

> > 3. The method to check has to be a new object function.
> >    Something like:
> > 
> >    typedef gboolean (*AllowConnectFunc) (Object* obj_me,
> >                                          Object* obj_other,
> >                                          ... /* ? */ );
> 
> You may want to give the handle and connection point to the function.
> Could be some objects will allow objects to connect in certain ways and not
> in others.

Absolutely true.

typedef gboolean (*AllowConnectFunc) (Object* obj_me,
                                      Object* obj_other,
                                      Handle* handle,
                                      ConnectionPoint* conpoint);

Cheers!