[Zope3-dev] Event fixes

[Dominik Huber]

Florent Guillaume wrote:

> I'd like to do a few simple fixes to events in Zope 3.2 before it's  
> too late:
>
> - Add the source to IObjectCopiedEvent, per
> http://www.zope.org/Collectors/Zope3-dev/478
> I believe I received a +1 on this
>
> - Make OrderedContainer.updateOrder send an IObjectModifiedEvent.  
> Today when you change the order no event at all is fired, this is wrong.

+1

> - Finally I'd like to make all containers send a specific subclass  
> instead of just an IObjectModifiedEvent (I propose naming it  
> IContainerModifiedEvent), because it makes it possible to isolate  
> change to an object that only affect the 'containment' aspect of it.  
> Subscribers can then have specific optimizations, for instance a  
> catalog would want to isolate this because it only affects  
> containment boundaries and not the "content" of the object. (This is  
> a concrete use case BTW, in CPS's event model we have this  
> distinction and it's useful.)

The IModificationDescription (zope.app.event.interfaces) tries to achive 
a similar thing. There was a modification desciription for 
attributes(.objectevent.Attributes). During the isar-sprint we introduce 
a modification description for sequences (.objectevent.Sequence).
(IMO we should prevent an explosion of event subclasses.)

Regards,
Dominik
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