.\"	$NetBSD: menu_hook.3,v 1.9 2017/07/03 21:32:50 wiz Exp $
.\"
.\" Copyright (c) 1999
.\"	Brett Lymn - blymn@baea.com.au, brett_lymn@yahoo.com.au
.\"
.\" This code is donated to The NetBSD Foundation by the author.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. The name of the Author may not be used to endorse or promote
.\"    products derived from this software without specific prior written
.\"    permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd September 10, 1999
.Dt MENU_HOOK 3
.Os
.Sh NAME
.Nm item_init ,
.Nm item_term ,
.Nm menu_init ,
.Nm menu_term ,
.Nm set_item_init ,
.Nm set_item_term ,
.Nm set_menu_init ,
.Nm set_menu_term
.Nd get or set handler functions for menu post/unpost or item change
.Sh LIBRARY
.Lb libmenu
.Sh SYNOPSIS
.In menu.h
.Ft void (*hook)()
.Fn item_init "MENU *menu"
.Ft void (*hook)()
.Fn item_term "MENU *menu"
.Ft void (*hook)()
.Fn menu_init "MENU *menu"
.Ft void (*hook)()
.Fn menu_term "MENU *menu"
.Ft int
.Fn set_item_init "MENU *menu" "void (*hook)())"
.Ft int
.Fn set_item_term "MENU *menu" "void (*hook)())"
.Ft int
.Fn set_menu_init "MENU *menu" "void (*hook)())"
.Ft int
.Fn set_menu_term "MENU *menu" "void (*hook)())"
.Sh DESCRIPTION
The
.Fn item_init
function returns a pointer to the function that will be called
whenever the menu is posted and also just after the current item
changes.
This is set by the
.Fn set_item_init
call.
The
.Fn item_term
function returns a pointer to the function that will be called before
the menu is unposted and just before the current item changes, this
pointer is set by the
.Fn set_item_term
call.
The
.Fn menu_init
functions returns a pointer to the function that will be called just
before the menu is posted to the screen.
This pointer is set by the
.Fn set_menu_init
function call.
The
.Fn menu_term
function returns a pointer to the function that will be called just
after the menu has been unposted, this pointer is set by the
.Fn set_menu_term
function.
.Sh SEE ALSO
.Xr curses 3 ,
.Xr menus 3
.Sh NOTES
The header
.Pa <menu.h>
automatically includes both
.Pa <curses.h>
and
.Pa <eti.h> .