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menu_hook 3x 2024-03-16 ncurses 6.5 Library calls

menu_hook(3x)                    Library calls                   menu_hook(3x)

NAME

       menu_hook - set hooks for automatic invocation by applications

SYNOPSIS

       #include <menu.h>

       int set_item_init(MENU *menu, Menu_Hook func);
       Menu_Hook item_init(const MENU *menu);

       int set_item_term(MENU *menu, Menu_Hook func);
       Menu_Hook item_term(const MENU *menu);

       int set_menu_init(MENU *menu, Menu_Hook func);
       Menu_Hook menu_init(const MENU *menu);

       int set_menu_term(MENU *menu, Menu_Hook func);
       Menu_Hook menu_term(const MENU *menu);

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
       menu_driver.

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

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

       The  function  set_menu_init sets a hook to be called at menu-post time
       and just after the top row on the  menu  changes  once  it  is  posted.
       menu_init  returns the current menu init hook, if any (NULL if there is
       no such hook).

       The function set_menu_term sets a hook to be called at menu-unpost time
       and  just  before  the  top  row on the menu changes once it is posted.
       menu_term returns the current menu 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(3)).

PORTABILITY

       These routines emulate the  System  V  menu  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.

SEE ALSO

       curses(3x), menu(3x)



ncurses 6.5                       2024-03-16                     menu_hook(3x)