Question

I have a simple Core Data app which displays a list of entities in the main window. To create or add new entities, I use a second modal window with a separate managed object context so changes can be undone/redone without interfering with the main managed object context.

The editing window is launched using runModalForWindow:. If I make a series of discrete changes in this modal window, doing a single undo results in undoing ALL my changes. I tried setting the run loop modes of NSUndoManager (obtained from the second managed object context) to contain NSModalPanelRunLoopMode but that didn t appear to make any difference.

If I don t launch the window using runModalForWindow: and simply use makeKeyAndOrderFront:, everything works as expected.

Has anyone run into this before?

Kevin

Answer 1

Are you by chance using the Cocoa Application Kit for your application? Not sure why it wouldn t do that on your main window, and only on the overlay.. but this might be in the right direction..

The following quote is from the Mac Dev Center, NSUndoManager Class Reference:

When performing undo an NSUndoManager saves the operations reverted so that you can redo the undos. If used in a Cocoa Application Kit-based application, NSUndoManager groups all operations within a single cycle of the run loop, so that performing an undo reverts all changes that occurred during the cycle.

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