I have a NSTextField with a NSFormatter. When the user enters an incorrect
value an alert sheet drops down from the document window stating “Please
provide a valid value.”. The alert display two buttons: "Discard Change" and
“OK”.
I would like have no alert sheet but rather discard the change and beep. You
can see this behavior in some inspector text fields of Apple Productivity Apps
(Numbers, Pages, etc).
A NSTextFieldDelegate method has been implemented like so.
- (BOOL)control:(NSControl *)control didFailToFormatString:(NSString *)string
errorDescription:(NSString *)error
{
NSBeep();
return NO;
}
This gives a beep but how is the alert sheet suppressed and the change
discarded?
Does anyone know how to do this?
--Richard Charles
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