Re: Support for callbacks...

[Herman Bruyninckx <Herman Bruyninckx mech kuleuven ac be>]

On Wed, 16 Jul 2003, Lars Clausen wrote:

> On Tue, 15 Jul 2003, Herman Bruyninckx wrote:
> > What is the status of callbacks in the Dia roadmap?
> >
> > I mean, is it (or will it be) possible to let some dia actions call a
> > user-defined function?
> >
> > For example, a callback on each (dis)connection event on the canvas
> > gives a lot of possibilities to add user-specific functionality to
> > Dia. (E.g., to check whether it has a meaning in the users'
> > application context to connect two given objects together.)
>
> That's funny, I was just thinking about that in the shower this morning.  A
> callback function would allow both elements and connectors to decide
> whether they will allow the connection, and if they do, make any changes
> that are needed.
>
> Unless, by 'user-defined function', you mean that the user can add a bit of
> scripting to an object to be evaluated upon connection.  Given the above,
> that could be added using the Python plugin, or any other plugin that
> anyone cares to add.  

Indeed! That's exactly what I was looking for: a small extension of
the Dia code could make tremendous changes in what a user can do with
the program. My hope was to embed Dia as a "graphical editor" inside a
robot simulation program... Most of the work would happen outside of
Dia (via a Python plugin).

Herman

-- 
  K.U.Leuven, Mechanical Engineering, Robotics Research Group
<http://people.mech.kuleuven.ac.be/~bruyninc> Tel: +32 16 322480