'\" t
.\"***************************************************************************
.\" Copyright 2018-2019,2020 Thomas E. Dickey                                *
.\" Copyright 1998-2014,2017 Free Software Foundation, Inc.                  *
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.\" $Id: menu.3x,v 1.27 2020/02/02 23:34:34 tom Exp $
.TH menu 3X ""
.ie \n(.g .ds `` \(lq
.el       .ds `` ``
.ie \n(.g .ds '' \(rq
.el       .ds '' ''
.de bP
.ie n  .IP \(bu 4
.el    .IP \(bu 2
..
.SH NAME
\fBmenu\fR \- curses extension for programming menus
.SH SYNOPSIS
\fB#include <menu.h>\fR
.br
.SH DESCRIPTION
The \fBmenu\fR library provides terminal-independent facilities for composing
menu systems on character-cell terminals.
The library includes: item routines,
which create and modify menu items; and menu routines, which group items into
menus, display menus on the screen, and handle interaction with the user.
.PP
The \fBmenu\fR library uses the \fBcurses\fR libraries, and a curses
initialization routine such as \fBinitscr\fR must be called before using any of
these functions.
To use the \fBmenu\fR library, link with the options
\fB\-lmenu \-lcurses\fR.
.
.SS Current Default Values for Item Attributes
.
The \fBmenu\fR library maintains a default value for item attributes.
You can
get or set this default by calling the appropriate \fBget_\fR or \fBset_\fR
routine with a \fBNULL\fR item pointer.
Changing this default with a
\fBset_\fR function affects future item creations, but does not change the
rendering of items already created.
.
.SS Routine Name Index
.
The following table lists each \fBmenu\fR routine and the name of
the manual page on which it is described.
.
.TS
l l .
\fBcurses\fR Routine Name	Manual Page Name
=
current_item	\fBmitem_current\fR(3X)
free_item 	\fBmitem_new\fR(3X)
free_menu 	\fBmenu_new\fR(3X)
item_count	\fBmenu_items\fR(3X)
item_description	\fBmitem_name\fR(3X)
item_index	\fBmitem_current\fR(3X)
item_init 	\fBmenu_hook\fR(3X)
item_name 	\fBmitem_name\fR(3X)
item_opts 	\fBmitem_opts\fR(3X)
item_opts_off	\fBmitem_opts\fR(3X)
item_opts_on	\fBmitem_opts\fR(3X)
item_term 	\fBmenu_hook\fR(3X)
item_userptr	\fBmitem_userptr\fR(3X)
item_value	\fBmitem_value\fR(3X)
item_visible	\fBmitem_visible\fR(3X)
menu_back 	\fBmenu_attributes\fR(3X)
menu_driver	\fBmenu_driver\fR(3X)
menu_fore 	\fBmenu_attributes\fR(3X)
menu_format	\fBmenu_format\fR(3X)
menu_grey 	\fBmenu_attributes\fR(3X)
menu_init 	\fBmenu_hook\fR(3X)
menu_items	\fBmenu_items\fR(3X)
menu_mark 	\fBmenu_mark\fR(3X)
menu_opts 	\fBmenu_opts\fR(3X)
menu_opts_off	\fBmenu_opts\fR(3X)
menu_opts_on	\fBmenu_opts\fR(3X)
menu_pad  	\fBmenu_attributes\fR(3X)
menu_pattern	\fBmenu_pattern\fR(3X)
menu_request_by_name	\fBmenu_requestname\fR(3X)
menu_request_name	\fBmenu_requestname\fR(3X)
menu_spacing	\fBmenu_spacing\fR(3X)
menu_sub  	\fBmenu_win\fR(3X)
menu_term 	\fBmenu_hook\fR(3X)
menu_userptr	\fBmenu_userptr\fR(3X)
menu_win  	\fBmenu_win\fR(3X)
new_item  	\fBmitem_new\fR(3X)
new_menu  	\fBmenu_new\fR(3X)
pos_menu_cursor	\fBmenu_cursor\fR(3X)
post_menu 	\fBmenu_post\fR(3X)
scale_menu	\fBmenu_win\fR(3X)
set_current_item	\fBmitem_current\fR(3X)
set_item_init	\fBmenu_hook\fR(3X)
set_item_opts	\fBmitem_opts\fR(3X)
set_item_term	\fBmenu_hook\fR(3X)
set_item_userptr	\fBmitem_userptr\fR(3X)
set_item_value	\fBmitem_value\fR(3X)
set_menu_back	\fBmenu_attributes\fR(3X)
set_menu_fore	\fBmenu_attributes\fR(3X)
set_menu_format	\fBmenu_format\fR(3X)
set_menu_grey	\fBmenu_attributes\fR(3X)
set_menu_init	\fBmenu_hook\fR(3X)
set_menu_items	\fBmenu_items\fR(3X)
set_menu_mark	\fBmenu_mark\fR(3X)
set_menu_opts	\fBmitem_opts\fR(3X)
set_menu_pad	\fBmenu_attributes\fR(3X)
set_menu_pattern	\fBmenu_pattern\fR(3X)
set_menu_spacing	\fBmenu_spacing\fR(3X)
set_menu_sub	\fBmenu_win\fR(3X)
set_menu_term	\fBmenu_hook\fR(3X)
set_menu_userptr	\fBmenu_userptr\fR(3X)
set_menu_win	\fBmenu_win\fR(3X)
set_top_row	\fBmitem_current\fR(3X)
top_row   	\fBmitem_current\fR(3X)
unpost_menu	\fBmenu_post\fR(3X)
.TE
.SH RETURN VALUE
Routines that return pointers return \fBNULL\fR on error.
Routines that return
an integer return one of the following error codes:
.TP 5
.B E_OK
The routine succeeded.
.TP 5
.B E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
.TP 5
.B E_BAD_STATE
Routine was called from an initialization or termination function.
.TP 5
.B E_NO_MATCH
Character failed to match.
.TP 5
.B E_NO_ROOM
Menu is too large for its window.
.TP 5
.B E_NOT_CONNECTED
No items are connected to the menu.
.TP 5
.B E_NOT_POSTED
The menu has not been posted.
.TP 5
.B E_NOT_SELECTABLE
The designated item cannot be selected.
.TP 5
.B E_POSTED
The menu is already posted.
.TP 5
.B E_REQUEST_DENIED
The menu driver could not process the request.
.TP 5
.B E_SYSTEM_ERROR
System error occurred (see \fBerrno\fR(3)).
.TP 5
.B E_UNKNOWN_COMMAND
The menu driver code saw an unknown request code.
.SH NOTES
The header file \fB<menu.h>\fR automatically includes the header files
\fB<curses.h>\fR and \fB<eti.h>\fR.
.PP
In your library list, libmenu.a should be before libncurses.a; that is,
you should say \*(``\-lmenu \-lncurses\*('', not the other way around
(which would give a link-error when using static libraries).
.SH PORTABILITY
These routines emulate the System V menu library.
They were not supported on
Version 7 or BSD versions.
.PP
The menu facility was documented in SVr4.2 in
\fICharacter User Interface Programming (UNIX SVR4.2)\fP.
.PP
It is not part of X/Open Curses.
.PP
Aside from ncurses, there are few implementations:
.bP
systems based on SVr4 source code, e.g., Solaris.
.bP
NetBSD curses.
.SH AUTHORS
Juergen Pfeifer.
Manual pages and adaptation for ncurses by Eric S. Raymond.
.SH SEE ALSO
\fBcurses\fR(3X) and related pages whose names begin \*(``menu_\*(''
for detailed descriptions of the entry points.
.PP
This describes \fBncurses\fR
version @NCURSES_MAJOR@.@NCURSES_MINOR@ (patch @NCURSES_PATCH@).