[Zope-CMF] How to tell what action has been called

[seb bacon]

How can I find out which action has been called on an object just
before its publication?  At the moment, I'm using a BeforeTraverse
hook to snarf the TraversalRequestNameStack.  Then I'm walking the
stack comparing each method in turn to each method in the object's
TypeInfo actions list.  When they match I have found the correct
action.

This feels very wrong, and very inefficient.  Can anyone think of any
better ways of doing this?

    def __call__(self, client, request, response=None):
        stack = request['TraversalRequestNameStack']
        myAction = None
        stack.reverse()
        ti = self.getTypeInfo()
        if ti is not None:
            actions = ti.getActions()
            for stackItem in stack:
                for a in actions:
                    if a['action'] == stackItem:
                        myAction = a['id']
                        break
	# do stuff with myAction, before I get published

In case you're wondering what I'm up to, here's an explanation, which
is entirely optional reading ;-)

A question which arises when making composite content is what action
should be performed on components which are in slots.

In the following example, FooTemplate is a page layout which contains
an image and a document in slot 1 and slot 2.  When the 'view' action
is performed on the FooTemplate, what should the action be which is
performed on the slots?

  FooTemplate/view
          |
          `- image_1/view
          |  
	  `- document_1/view

In this diagram, I'm having the slots perform the same action as the
Template, but I think the concept is much more powerful (and
generalised) if you can map Template actions to slot actions
arbitrarily.  

I've set up a kind of actions mapping registry, but now I need to know
what action has been performed on the Template before it is published,
in order to look up the information for its respective slots.

cheers,

seb