Re: NSControl fix

[Andreas Höschler]

Hi Fred,

> I still think this patch, which you did propose before is wrong. We
> should do the validation when accessing the value of the cell. 
> According
> to the specification this gets done in NSActionCell for int, float and
> string values, but not for the object value itself.
> Which specific subclass of NSCell are you using? Perhaps the
> implementation of this class is wrong.

I encounter the problem with a NSTextField and an NSNumberFormatter. 
The objectValue returned by the NSTextField is nil until the text field 
is left. MacOSX presents a valid objectValue while the string is 
edited, as long as it can be converted to a number, otherwise nil (of 
course).

I currently use the following NSControl implementation:

- (void)textDidChange: (NSNotification *)aNotification
{
   NSMutableDictionary *dict;

   // validate NSNumbers immediately so that objectValue returns 
reasonable values in controlTextDidChange:
   if ([_cell isEntryAcceptable:[[aNotification object] text]])
     {
      [self validateEditing];
     }

    ...
}

Regards,

  Andreas