[Pyobjc-dev] Key Value Observing of lists?

[Orestis M. <or...@or...>]

Hi,

I'm trying to bound an NSTableView to a list using an array  
controller. This works fine, as long as I don't mutate the list  
(list.append, for example).

I have a workaround where I surround changes to the list with:

self.willChangeValueForKey_("selections")
self.selections.append("new selection")
self.didChangeValueForKey_("selections")

This works fine for now, but gives me the following messages in the  
Console:

*** Ignoring *** addObserver:forKeyPath:options:context: for  
'partName' (of <NSTableBinder: 0x3fad90>{object: <NSTableView:  
0x3eabc0>, bindings: content=arrangedObjects} with 0 in 0x0).

(where partName is an attribute in the object that gets stored in the  
list).

I presume that when I issue the above notifications, the KVO mechanism  
walks the list and tries to observe every object again, but they're  
already observer and thus ignored. Am I missing something obvious or I  
must write my own wrapper around list? I've found the accessor  
decorator in the objc source, but I'm not sure about how should I use  
for lists.

Regards,
--
Orestis Markou
or...@or...
http://orestis.gr/