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hook(3form)


NAME

   form_hook - set hooks for automatic invocation by applications

SYNOPSIS

   #include <form.h>
   int set_field_init(FORM *form, Form_Hook func);
   Form_Hook field_init(const FORM *form);
   int set_field_term(FORM *form, Form_Hook func);
   Form_Hook field_term(const FORM *form);
   int set_form_init(FORM *form, Form_Hook func);
   Form_Hook form_init(const FORM *form);
   int set_form_term(FORM *form, Form_Hook func);
   Form_Hook form_term(const FORM *form);

DESCRIPTION

   These  functions make it possible to set hook functions to be called at
   various points in the automatic processing  of  input  event  codes  by
   form_driver.

   The  function set_field_init sets a hook to be called at form-post time
   and  each  time  the  selected  field  changes  (after   the   change).
   field_init  returns  the current field init hook, if any (NULL if there
   is no such hook).

   The function set_field_term sets a hook to  be  called  at  form-unpost
   time  and  each  time  the  selected field changes (before the change).
   field_term returns the current field term hook, if any (NULL  if  there
   is no such hook).

   The  function  set_form_init sets a hook to be called at form-post time
   and just after a page change once it is posted.  form_init returns  the
   current form init hook, if any (NULL if there is no such hook).

   The function set_form_term sets a hook to be called at form-unpost time
   and just before a page change once it is posted.  form_init returns the
   current form term hook, if any (NULL if there is no such hook).

RETURN VALUE

   Routines  that  return  pointers  return NULL on error.  Other routines
   return one of the following:

   E_OK The routine succeeded.

   E_SYSTEM_ERROR
        System error occurred (see errno).

SEE ALSO

   ncurses(3NCURSES), form(3FORM).

NOTES

   The  header  file  <form.h>  automatically  includes  the  header  file
   <curses.h>.

PORTABILITY

   These  routines  emulate  the  System  V  forms library.  They were not
   supported on Version 7 or BSD versions.

AUTHORS

   Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
   Raymond.

                                                               hook(3FORM)



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