menu_hook(3x) — Linux manual page

menu_hook(3X)                                              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)).

SEE ALSO

       curses(3X), menu(3X).

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.

COLOPHON

       This page is part of the ncurses (new curses) project.
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       ⟨https://www.gnu.org/software/ncurses/ncurses.html⟩.  If you have
       a bug report for this manual page, send it to
       bug-ncurses-request@gnu.org.  This page was obtained from the
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       ⟨https://github.com/mirror/ncurses.git⟩ on 2024-06-14.  (At that
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                                                           menu_hook(3X)