Re: Dynamically validating undo menu item availability (NSUndoManager)

FROM : Mike Abdullah
DATE : Fri Jan 11 23:46:54 2008

The -validateMenuItem: method in an appropriate controller should do 
wonders.

Mike.

On 11 Jan 2008, at 22:22, Lachlan Cotter wrote:

> 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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