My app subclasses NSUndoManager, so that it can provide a couple of
extra things to the app, namely, task coalescing and a change count
that I track to see if certain operations which come from a wide
variety of places actually submitted an undo task (and hence the undo
manager itself is the one central place that knows about them).
On 10.6, While Undo is still generally working, the stuff my class
added are not. In trying to track this down, I was getting some very
puzzling results, like none of my breakpoints were firing in my
subclass's override for -forwardInvocation. Then I spot this note in
the docs:
"On Mac OS X v10.6 and later, this method (-
prepareWithInvocationTarget:) returns a proxy object for the receiver
that forwards all messages to the receiver as undo operations."
OK, I understand why that was done, but how can I alter my code so it
works for this non-backwards-compatible situation? It seems this
mysterious proxy object is forwarding to some private method of
NSUndoManager that I can't override, so it's bypassing my very useful
additions. I need to know where I can hook into whatever this proxy
object delivers the task to the U/M.
Any ideas?
--Graham
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