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       cdk_process - curses widget pre/post-processing


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


       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.


       cdk(3), cdk_binding(3).