[Grok-dev] grok.Skin question.

[Fernando Correa Neto]

Hey there,

Someone on IRC asked if I ever used z3c.form with grok and I decided
to give it a try by just using grok components.
In z3c.form, a lot of it's components are registered for
z3c.form.interfaces.IFormLayer. In order to create a form you
basically need to create a layer like:


from z3c.form.interfaces import IFormLayer
from z3c.layout.pagelet import IPageletBrowserLayer

class IMyFormLayer(IFormLayer, IPageletBrowserLayer):
    """a form layer"""


But then in your skin, you must inherit from IMyFormLayer AND
z3c.formui.interfaces.IDivFormLayer or
z3c.formui.interfaces.ITableFormLayer (depending on what you want in
your html).
So in terms of layers I think we are prettu much OK since we can do this:


class MyGrokLayer(IFormLayer, IPageletBrowserLayer):
    pass


But then when you declare your skin naively like this:

class MyGrokSkin(grok.Skin, IDivFormLayer):
    grok.name('youwhish')
    grok.layer(MyGrokLayer)


It is raises a conflict error like this:

zope.configuration.xmlconfig.ZopeXMLConfigurationError: File
"/Users/fcorrea/grokapps/grokenv/z3cformtest/parts/app/site.zcml",
line 4.0-4.33
    ZopeXMLConfigurationError: File
"/Users/fcorrea/grokapps/grokenv/z3cformtest/src/z3cformtest/configure.zcml",
line 5.2-5.27
    TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a
(non-strict) subclass of the metaclasses of all its bases


So the question is: Would it be possible to create a skin in grok that
gets registered for anything else other than just IBrowserSkinType?
Does anyone know any pattern?

I am attaching my current app.py in case someone decides to take a look.

Best regards,
Fernando

P.S: The test form is also subclassing grok.View for testing purposes
so I could just reach it through url.
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