Dynamically validating undo menu item availability (NSUndoManager)
Dynamically validating undo menu item availability (NSUndoManager)
- Subject: Dynamically validating undo menu item availability (NSUndoManager)
- From: Lachlan Cotter <email@hidden>
- Date: Sat, 12 Jan 2008 11:22:09 +1300
Hi Cocoabuilders,
I've got a situation where I'm performing operations on the file
system and I want those operations to be undoable. The tricky part is
that because the file system can be changed by anyone at anytime, I
can't necessarily assume that it will be in a state which is
consistent with how I made my change. I have routines which can check
for this and determine whether or not I am able to undo, but I don't
know the best way to work with the UndoManager on this.
How can I proactively get my validation routine called and disable to
undo menu item when it is not available?
Cheers,
Lach
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