Disabling undo between events

[Jonathan Grynspan-2]

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
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[Christiaan Hofman]

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


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[Jonathan Grynspan-2]

I implemented -undo: and -redo: in my view, and now it's all working  
the way it ought to--except that the Undo and Redo menu items aren't  
titled correctly. That's easy enough to fix, by sending -
undoMenuItemTitle and -redoMenuItemTitle to my undo manager. However,  
the strings returned include ampersands (&), which I assume are for  
the benefit of Windows (key alternate indicators.) I just strip these  
out, but is there a different message I should be sending that won't  
return strings with ampersands, or is it expected to be the caller's  
responsibility to remove them?

Thanks,
Jonathan Grynspan

On 22-Jul-06, at 10:27 AM, Christiaan Hofman wrote:

>
> 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
>
>
> _______________________________________________
> MacOSX-dev mailing list
> MacOSX-dev@...
> http://www.omnigroup.com/mailman/listinfo/macosx-dev

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