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CoreData and undo/redo : how to add a managed object with attributes already set in the undo/redo stack ?
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CoreData and undo/redo : how to add a managed object with attributes already set in the undo/redo stack ?


  • Subject: CoreData and undo/redo : how to add a managed object with attributes already set in the undo/redo stack ?
  • From: Guillaume Laurent <email@hidden>
  • Date: Sun, 27 Jun 2010 01:01:52 +0200

Hi all,

I'm having difficulties with the undo/redo mechanism and my Core Data objects. The problem is that I create a CoreData object (say a rectangle), then set some of its attributes according to some controls values (the position and size of a CALayer the user has just created in a view). This set of actions is a single one from the user's point of view. I know I can make it appear so with NSUndoManager:beginUndoGrouping/endUndoGrouping. But when I undo this in the app, each of the steps of the object's creation are undone seperately, including the setting of each of the attributes.

This wouldn't be much of a problem in itself but it does make much more complex the observing of the object's attributes, which I require to maintain the consistency of the relationship between the CoreData rectangle and the CALayer representing it.

Bottom line : is there a way to make it so that the CoreData object's instantiation and its setup are registered as a single action in the undo/redo stack ? So that instead of having

- new rect with rect.x = 0
- rect.x change from 0 to 100

I can have

- new rect with rect.x = 100

?

Thanks for any replies,

--
Guillaume
http://telegraph-road.org





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