I have a Core Data Entity called VisualizationPlugIn, and a class to go with
it. This Entity declares these properties:
NSString* shadowFrame;
NSRect frame; // transient
and implements the getter and setter for frame as you would expect, converting
the rect to/from an NSString, and calling will/didAccess/ChangeValueForKey.
When one of these is instantiated, it can also create an NSViewController
subclass and view hierarchy that gets added to a window. When that happens, I
programmatically bind the plug-in's top-level view's frame to the plug-in's
frame Core Data property. This all seems to work. If the user re-positions the
view hierarchy in the window, Core Data properly saves and restores that frame.
But Undo doesn't work. If I move the plug-in's view around, I can see that the
context gets dirty (the close button in the window fills in), but if I undo,
the view isn't moved back, and the context doesn't get clean.
So I thought Core Data must be undoing the shadowFrame property, and no one's
getting notified. To the VisualizationPlugIn class, I added
+ (NSSet*)
keyPathsForValuesAffectingFrame
{
return [NSSet setWithObject: @"shadowFrame"];
}
But it never gets called.
Any idea what I should be doing instead? Thanks!
--
Rick
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