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).

SEE ALSO

       ncurses(3NCURSES), menu(3MENU).

NOTES

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

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.

                                                                                                     hook(3MENU)