[Zope3-Users] Re: viewlets for specific interfaces

[Luis De la Parra]

hello,

yes. I guess that would do the trick, but I'd be moving configuration into
the code, which I think belongs in the zcml... (which sometimes can be a
good thing, but I think this particular configuration fits better in the
zcml)

what is the pourpose of the "for" option in the zcml directive anyways??
It'd be nice if I could define my interfaces (plural!) for which the viewlet
should render without changing the code.

thanks anyways. 
cheers. luis

Darryl Cousins wrote:

> Hi,
> 
> Try testing the context interface in update.
> 
> dorender = False
> def update(self):
> if MyInterface.providedBy(self.context):
> self.dorender = True
> 
> def render(self):
> if self.dorender:
> return u'Hello'
> else:
> return u''
> 
> That may do it.
> 
> Regards,
> Darryl
> 
> On Wed, 2006-09-13 at 20:59 +0200, Luis De la Parra wrote:
>> hello,
>> 
>> I'm trying to get started with viewlets, but am still having some
>> problems:
>> 
>> For example, I have a "LeftColumn" viewletmanager, where I want to
>> display different infos (viewlets) depending on the object that's being
>> displayed (one viewlet for folders, one for "normal" files, one for
>> images, etc)
>> 
>> the following example works either for all interfaces or for none, and
>> I'm trying to figure out how to render a particular viewlet only for a
>> particular interface...
>> 
>> any pointers in the right direction?  thanx a lot!  Luis
>> 
>> 
>> #### test/__init__.py
>> ############################################################
>> from zope import component
>> from zope import interface
>> from zope import viewlet
>> 
>> class ILeftColumn(viewlet.interfaces.IViewletManager):
>>     """ Viewlet manager for the left column"""
>>     
>> 
>> class HelloMessage(object):
>>     interface.implements(viewlet.interfaces.IViewlet)
>>     
>>     def __init__(self,context,request,view,manager):
>>         self.__parent__ = view
>>         self.context, self.request = context,request
>>         
>>     def update(self):
>>         pass
>>         
>>     def render(self):
>>         return u'<div>Hello!</div>'
>> 
>> #### test/configure.zcml
>> ############################################################
>> <configure
>>         xmlns="http://namespaces.zope.org/zope"
>>         xmlns:browser="http://namespaces.zope.org/browser">
>> 
>>   <browser:page
>>            for="*"
>>            name="viewlet.html"
>>            template="index.pt"
>>            permission="zope.View"/>
>> 
>>   <browser:viewletManager
>>                 name="vm"
>>                 permission="zope.Public"
>>                 provides=".ILeftColumn"
>>                 template="vm.pt"/>
>> 
>> <!-- ###########################
>>  
>>      for="*"  shows "hello" for any object
>>      for="zope.app.file.interfaces.IFile"
>>          does not work for any object, IFiles
>>          included. why ???
>>      ##########################
>> -->
>>   <browser:viewlet
>>     name="hello"
>>     for="zope.app.file.interfaces.IFile"
>>     manager=".ILeftColumn"
>>     class=".HelloMessage"
>>     permission="zope.Public"/>
>> 
>> </configure>
>> 
>> 
>> 
>> 
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