On 14 Mar 2012, at 5:26 AM, Luc Van Bogaert wrote:
> On 13 Mar 2012, at 22:07, Kyle Sluder wrote:
>
>> On Mar 13, 2012, at 1:49 PM, Luc Van Bogaert wrote:
>>
>>> Hi,
>>>
>>> In my document-based app, I am using NSDocument's NSUndoManager to
>>> implement undo/redo. As part of my document objects, I have to deal with a
>>> custom object, for which I would also like to implement undo/redo. I know
>>> NSResponder has undo/redo features, but how should I implement this for a
>>> custom object?
>>
>> Not sure what you're asking here. What is your custom object--a view, a
>> controller, a model object? Should it use the same undo manager as all the
>> other objects?
>
> I would like to implement undo/redo for a model object which in turn is also
> a ivar backed property of a document object. I'm already using the document's
> undo manager to undo/redo setting the model object property. Once the
> property is set, the application has features to change properties of the
> model object. I'm not sure how to implement undo/redo for the changes of the
> model object's properties and ivars.
I still don't fully understand your design.
Is your problem that you feel you can undo assignment at the top level (the
document's to-one relationship to the model object), but not changes to
attributes and relationships of the model object itself?
If the document/window controller did the changes to the attributes (undo is a
user-level concept, so there has to be a controller somewhere in the chain
leading up to it), you'd have the document's undo manager, and the controller
could register the changes itself. (registerUndo… /
prepareWithInvocationTarget:)
If the relationship to the model attributes is more complicated, then (1) it
isn't in response to a user/controller event, and it shouldn't be undoable
(undo is a user-level concept); or in some rare case, (2) you'll have to pass
the controller or its undo manager down to the model object somehow, so it can
do the registration.
I feel I'm being vague and obvious, but as I say, I don't quite get what you're
trying to do.
— F
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