Thread-topic: Building a calculator text field: problem with NSFormatter
User-agent: Microsoft-Entourage/11.2.5.060620
on 11/29/06 10:50 PM, email@hidden purportedly said:
> So, any ideas how to make the text field wait until the user is finished
> to submit its value to the NSFormatter? Or, perhaps there is another
> approach that would work better --- subclassing NSTextField, a
> delegate? Perhaps there is already a "NSCalculatingTextField" and I
> just missed it?
How Cocoa handles formatters is (IMHO) odd and counter intuitive.
getObjectValue:forString:errorDescription: is called for every key press,
although any errors returned are ignored until the field loses focus. This
may or may not be effected by a binding "validates immediately"--haven't
tested to be sure.
The most direct way to do what you want would be to use a validator instead
of a formatter, but you *could* use a formatter if you have some trigger
value, say, an equals character. If you evaluate the "expression" only when
the string value ends in an equals, you will probably get what you want.
Best,
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
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