[Qgis-developer] Custom form init function changes - Kind of API break

[Marco Hugentobler]

Hi Nathan

Could you add an entry to 
http://hub.qgis.org/wiki/quantum-gis/API_changes_for_version_20 ?

Regards,
Marco

Am 10.07.2012 13:07, schrieb Nathan Woodrow:
> Hey All,
>
> This is a just a quick email to let everyone know that I have changed
> the way that arguments are passed to a layers Init Python function.
> That is the option that you find in the Layer Properties dialog on the
> General tab. If you are using this then this will affect you and you
> will know what I'm talking about.
>
> I have changed it so that the reference to the layer and feature are
> now passed into the function rather then just ids.  The issue with
> just passing the feature id was that you couldn't get access to the
> new feature and geometry because you were given a 0 as the id and 0 is
> a valid id for already existing feature.
>
> So now instead of this:
>
> def myFunction(dialog, layer_id, feature_id)
>
> where layer_id and feature_id are integers.  You now do this:
>
> def myFunction(dialog, layer, feature)
>
> layer is a instance of QgsVectorLayer
> feature is a instance of QgsFeature
>
> You can now do things like:
>
> def myFunction(dialog, layer, feature):
>        id = layer.id()
>        name = layer.name()
>        geom = feature.geometry()
>        geom.length()
>        # etc
>
> This change will break your custom form logic if your code is
> expecting a interger for the feature argument but you get a QgsFeature
>
> Just a FYI so you don't freak out when you form logic doesn't work anymore.
>
> - Nathan
> _______________________________________________
> Qgis-developer mailing list
> Qgis-developer at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/qgis-developer


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux & Open Source Solutions
Weberstrasse 5, CH-8004 Zürich, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee