Re: [bpel-dev] Adding

[James Moody <James_Moody@xxxxxxxxxx>]

Hi Andreas,

Glad my responses were helpful.

First of all, I don't think there is
any extensibility currently in the area that you're talking about. In order
to understand where this might be added, it's helpful to understand a bit
about the GEF edit parts and figures that are involved.

On the canvas there are really two GEF
graphical viewers: one for the "main canvas" and one for the
tray. (You can see these being created and initialized by BPELEditor).
Each of these is seeded with an input; in both cases, this input EObject
is the Process. Each of these viewers then creates an EditPart for the
input (they get different types of edit parts because each viewer has a
different factory). In the case of the "main canvas", this edit
part controls the drawing and interaction of the entire canvas (not just
the area where the activities are actually drawn). This class is ProcessEditPart.
One of the responsibilities of an edit part is to understand how to deal
with interaction, whether that is keyboard, mouse movement or hovering,
etc. Typically, edit policies are installed by the edit part to handle
these types of interaction. 

With that background out of the way
(apologies if you already know the above...), what you're really asking
for is a way to modify the way that ProcessEditPart works such that (a)
it appears to have extra children, and (b) draws and lays itself out differently.
It might be helpful for me to understand exactly what these objects are
that you're trying to add - what I'm getting at is whether you're really
trying to add new model extensions to the process, or whether you simply
want to have new figures and graphical behaviour on the canvas - one doesn't
necessarily imply the other. 

james

bpel-dev-bounces@xxxxxxxxxxx wrote on 07/24/2006 07:47:44
AM:

> Hi,
> 
> first of all thanks to James Moody for his support on understanding
the
> extension mechanism.
> 
> I have a rather bigger problem now:
> 
> Adding custom activities to the process works fine, but i have as
of now
> not been able to add anything _outside_ of the BPEL process. By
> _outside_ i mean inside the diagramm view but not in the process itself.
> I played around with different implementations of EClass but i cannot
> "drop" these outside the process (the mouse cursor stays
in the "void"
> mode).
> 
> Can somebody point me in the right direction? Or is this even impossible
> to do by way of using extension points?
> 
> Regards,
> Andreas
> 
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