def __call__(self):
"""Returns true if there's an exhibit in the acquisition chain
of the context"""
context = self.context
parents = aq_chain(aq_inner(context))
for item in parents:
if IExhibit.providedBy(item):
return True
return False
def __init__(self, *args):
base.Renderer.__init__(self, *args)
context = aq_inner(self.context)
exhibit = None
while exhibit is None:
if IExhibit.providedBy(context):
exhibit = context
context = aq_parent(context)
self.exhibit = exhibit