J-C Brand wrote:
>
> In the actions.xml there is a property "available_expr" in which I can
> specify a guard condition for when to show this action.
>
> This expression will render inside a page template, so it can either be
> a tales expression, or a python expression restricted to the page
> template environment.
>
> So, the question is, how can I test that an object is subtyped, or that
> an object provides a certain interface from within a page template?
>
I suggest you create a BrowserView which does the complex expression code in
Python.
Please see http://plonemanual.twinapex.fi/content/expressions.html "Custom
expression code"
--
Mikko Ohtamaa
http://www.twinapex.com - Python professionals for hire
--
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