Re: Dia Python

[Hans Breuer <Hans Breuer org>]

At 21:23 15.01.03 -0600, Lars Clausen wrote:
> As can be seen from my TWiki comments, I have gotten the Python plugin to
> work, and it's rather cute, in fact.  Now I've two fairly general questions
> about it that I hope somebody here can answer (Hans? James?):
>
> 1)  How do I set a value in a property?  I tried with just 
>
>              props[s].value = 0.2
Try:
        obj.properties[s] = 0.2

See:
        pug-ins/python/pydia-properties.c:PyDiaProperties_AssSub
for the implementation.

>    where s is a property key, but it gives me a type error.  Of course,
>    DiaProperty.value is an object, but how do I make an object for a real?
Looking deeper into the code PyDiaProperty_ApplyToObject there
may be some C programming needed to get the above to work :)

All my Dia Python scripts did work without applying other
things than strings.

> 2)  If I do changes values that way, will it be undoable?  I don't see a
>    lot of undo-related stuff in the python plugin code, does that need to
>    be rewritten?  I'd like to avoid the situation in Gimp where plugins
>    can totally screw up undo.
To me it appears rather useless to let every single line of a script
being undoable: At least as a user I'd expect one operation (executing
a menu function, no matter if it's a plug-in or not) to be
undoable in one step.
Forcing the creation of new object and changeing their values to
be undoable would probably decrease PyDia performance about 50% ...

But in fact I almost know nothing about Dias undo implementation.
Are 'undo groups' possible with the current code ?

        Hans
-------- Hans "at" Breuer "dot" Org -----------
Tell me what you need, and I'll tell you how to 
get along without it.                -- Dilbert