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PATH Mac OS 8 and 9 Developer Documentation
> Human Interface Toolbox
> Control Manager
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Programming With the Mac OS 8.5 Control Manager
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You may want to designate an application-defined function in conjunction with a key filter function to ensure that editable text is valid in cases such as a cut, paste, or clear, where a key filter cannot be called. Such a function has the following type definition:
typedef pascal void (ControlEditTextValidationProcPtr) (ControlHandle control);
See
MyControlEditTextValidationProc
for more information about how to implement the application-defined function.