cdk_process 3

cdk_process(3)            Library Functions Manual            cdk_process(3)


       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  pre-
       process function, its return value is ignored.


       cdk(3), cdk_binding(3).