Hi Niko,
I'm not a Cocoa expert. Nor am I familiar with Quicken. But I do have some
thoughts on your problem. First, I don't think you want to use a formatter for
what you're trying to do. When a complete expression has been entered you'd
want to see if it was well-formed. A "- (BOOL) canParse;" method that tested
the expression would let you determine if it could be evaluated. Then you
could evaluate it with a method like "- (float) evaluateExpression;" These
methods could be part of a NSObject subclass. Instances of this subclass would
be the delegates of your NSTextField subclasses. This isn't very detailed, but
I think it gives you an alternate approach that would work.
Sincerely,
Joel
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