NSUndoManager won't undo editing of a NSMutableDictionary
- by xon1c
Hi,
I'm experiencing problems with the undo operation. The following code won't undo an removeObjectForKey: operation but the redo operation setObject:ForKey: works.
- (void) insertIntoDictionary:(NSBezierPath *)thePath
{
[[[window undoManager] prepareWithInvocationTarget:self] removeFromDictionary:thePath];
if(![[window undoManager] isUndoing])
[[window undoManager] setActionName:@"Save Path"];
NSLog(@"Object id is: %d and Key id is: %d", [currentPath objectAtIndex:0], thePath);
[colorsForPaths setObject:[currentPath objectAtIndex:0] forKey:thePath];
}
- (void) removeFromDictionary:(NSBezierPath *)thePath
{
[[[window undoManager] prepareWithInvocationTarget:self] insertIntoDictionary:thePath];
if(![[window undoManager] isUndoing])
[[window undoManager] setActionName:@"Delete Path"];
NSLog(@"Object id is: %d and Key id is: %d", [[colorsForPaths allKeys] objectAtIndex:0], thePath);
[colorsForPaths removeObjectForKey:thePath];
}
The output on the console looks like:
// Before setObject:ForKey:
Object id is: 1184384 and Key id is: 1530016
// Before removeObjectForKey:
UNDO
Object id is: 2413664 and Key id is: 1530016
I don't get why the Object id is different although the Key id remains the same. Is there some special undo/redo handling of NSMutableDictionary objects?
thx
xonic
