[Drawkit] Undo not working for drawing / deleting objects

[Brad Larson]

I figured it out.  I needed to implement the delegate method

- (NSUndoManager *)windowWillReturnUndoManager:(NSWindow *)sender;
{
	return [self undoManager];
}

in my subclass of DKDrawingDocument, which is the delegate for my  
document window.  It's odd that this was not required for the DrawDemo  
application.

On Jun 3, 2008, at 6:07 PM, Graham Cox wrote:

> Hi Brad,
>
> Have you told the drawing what the undo manager is? You need to do  
> that if you are not using the DKDrawingDocument class.
>
> [myDKDrawing setUndoManager:[myDocument undoManager]];
>
> I'd also advise you to use the DKUndoManager rather than the  
> NSUndoManager. It's not essential, but for interactive editing it's  
> a lot more efficient, since it coalesces consecutive tasks for the  
> same property into one (otherwise e.g. dragging a shape to resize it  
> might create tens or hundreds of undo tasks). In this case you also  
> need to give the same undo manager object to your document/view as  
> well.
>
> cheers, Graham
>
>
> On 4 Jun 2008, at 8:56 am, Brad Larson wrote:
>
>> In our drawing program, I am able to load, save, and draw, as well  
>> do the standard cut-and-paste, but the undo / redo actions don't  
>> seem to work.  I must be missing something simple, but I can't seem  
>> to track it down in my connections or code.  I've made the  
>> DKDrawingView the first responder and connected the document's  
>> m_mainView.  Is there something special I must do to set up the  
>> undo manager or enable undo actions for the DKDrawing or  
>> DKDrawingView?
>>
>> ______________________
>> Brad Larson
>> SonoPlot, Inc.
>> 3030 Laura Lane, Suite 120
>> Middleton, WI 53562
>>
>>
>>
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>
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______________________
Brad Larson
SonoPlot, Inc.
3030 Laura Lane, Suite 120
Middleton, WI 53562