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menu_hook(3)                                                      menu_hook(3)




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.



                                                                   menu_hook(3)

ncurses 6.4 - Generated Wed Jan 4 15:28:54 CST 2023
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