Re: Disabling undo between events

FROM : Christiaan Hofman
DATE : Sat Jul 22 16:27:57 2006

On 21 Jul 2006, at 9:30 PM, Jonathan Grynspan wrote:

> I'm currently working on a small graphics application used for 
> editing the images in a game. I've implemented selection, line, 
> rect, etc. tools, but I've noticed that while the mouse button is 
> pressed, I can still activate Undo and Redo with Cmd+Z and Cmd+Shift
> +Z. I took a look at -[NSUndoManager disableUndoRegistration/
> enableUndoRegistration], but they only affect the creation of new 
> Undo events, rather than stopping me from firing old ones. -
> validateMenuItem: is never sent to my view for the Undo or Redo 
> menu items, so I can't use that to disable them. Anybody have any 
> ideas?
>
> Thanks,
> Jonathan Grynspan


Your -validateMenuItem: is not called because the target of the undo 
actions is the window. You could either subclass the window and 
overwite its -validateMenuItem:, or you can catch the -undo: action 
in your window delegate and implement its -validateMenuItem: there.

Christiaan