NAME

       cdk_process - curses widget pre/post-processing

SYNOPSIS

       Perform pre- and post-processing of data which is injected into a widget.

DESCRIPTION

       Character  input  is  handled  by each widget by its injection function.  That is typically a large case-
       statement consisting of the actions to be taken for editing and scrolling keys.  The calling  application
       can  modify  the behavior of the injection function by defining either or both preprocess and postprocess
       functions.

       Preprocessing is performed before doing anything with the injected keystroke.  If the preprocess function
       returns zero, no further action is taken in the injection function.  Note that  the  preprocess  function
       may do more than filter out characters; it can fill in logic to coordinate different widgets.

       Postprocessing  is  performed after all other actions have been done in the injection function.  Like the
       other actions, it is performed only if the preprocess function  returns  a  nonzero  value.   Unlike  the
       preprocess function, its return value is ignored.

SEE ALSO

       cdk(3), cdk_binding(3).

                                                                                                  cdk_process(3)