Jean-Marc Orliaguet wrote:
Jim Fulton wrote:
Florent Guillaume wrote:
...
+################################################################
+
+def renderItems(content, start='', repeat='%s', separator='',
end='', **kw):
+ if IMenuItems.providedBy(content):
+ items_markup = [start]
+ items_append = items_markup.append
+ for item in content:
+ items_append(repeat % (item['url'], item['title']))
+ items_append(separator)
+ items_append(end)
+ return ''.join(items_markup)
+ else:
+ return ''
In general in Zope 3 it's my understanding that it's better to do
try:
c = IMenuItems(content)
except ComponentLookupError:
return ''
... c used as iterable ...
return ...
Note that I prefer:
c = IMenuItems(content, None)
if c is None:
return ''
...
here is a trival question but what is the syntax for multi-adapters?
layout_renderer = getMultiAdapter((layout, request), IRenderer)
works,
Right. That's the way to do it.
> but:
layout_renderer = IRenderer(layout, request)
returns a BrowserRequest object instead of the renderer implementing
IRenderer
Right, interface call only does single-adapter lookup. The second argument
is the default.
and:
layout_renderer = IRenderer((layout, request))
returns a TypeError saying 'Could not adapt'
Yup. You are trying to look up an adapter for a tuple.
Note that I've wanted to be able to do multi-adapter lookup using interface
call. I've reluctantly come to the conclusion that it isn't a good idea.
See:
http://mail.zope.org/pipermail/interface-dev/2004-August/000063.html
FWIW, One idea I've had is to be able to compute adapter factories from
interfaces that then provide a nice syntax. Something like:
getRenderer = component.adapterFactory(IRenderer)
...
layoutRendered = getRenderer(layout, request)
Jim
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