135 lines
4.8 KiB
Groff
135 lines
4.8 KiB
Groff
.\" $NetBSD: menu_driver.3,v 1.4 2001/04/29 19:07:06 wiz Exp $
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.\"
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.\" Copyright (c) 1999
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.\" Brett Lymn - blymn@baea.com.au, brett_lymn@yahoo.com.au
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.\"
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.\" This code is donated to The NetBSD Foundation by the author.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the Author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd September 10, 1999
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.Dt MENU_DRIVER 3
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.Os
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.Sh NAME
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.Nm menu_driver
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.Nd main menu handling function
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.Sh LIBRARY
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.Lb libmenu
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.Sh SYNOPSIS
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.Fd #include <menu.h>
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.Ft int
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.Fn menu_driver "MENU *menu" "int c"
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.Sh DESCRIPTION
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The
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.Fn menu_driver
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function is the guts of the menu system. It takes the commands passed
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by c parameter and performs the requested action on the menu given.
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The following commands may be given to the menu driver:
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.Pp
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.Bl -tag -width REQ_CLEAR_PATTERN -compact
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.It Command
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Action
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.It REQ_LEFT_ITEM
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Sets the new current item to be the item to the left of the current
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item.
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.It REQ_RIGHT_ITEM
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Sets the new current item to be the item to the rights of the current
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item.
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.It REQ_UP_ITEM
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Sets the new current item to be the item above the current item.
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.It REQ_DOWN_ITEM
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Sets the new current item to be the item below the current item.
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.It REQ_SCR_ULINE
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Scroll the menu one line towards the bottom of the menu window. The
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new current item becomes the item immediately above the current item.
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.It REQ_SCR_DLINE
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Scroll the menu one line towards the top of the menu window. The new
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current item becomes the item immediately below the current item.
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.It REQ_SCR_DPAGE
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Scroll the menu one page towards the bottom of the menu window.
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.It REQ_SCR_UPAGE
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Scroll the menu one page towards the top of the menu window.
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.It REQ_FIRST_ITEM
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Set the current item to be the first item in the menu.
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.It REQ_LAST_ITEM
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Set the current item to be the last item in the menu.
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.It REQ_NEXT_ITEM
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Set the new current item to be the next item in the item array after
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the current item.
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.It REQ_PREV_ITEM
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Set the new current item to be the item before the current item in the
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items array.
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.It REQ_TOGGLE_ITEM
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If the item is selectable then toggle the item's value.
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.It REQ_CLEAR_PATTERN
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Clear all the characters currently in the menu's pattern buffer.
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.It REQ_BACK_PATTERN
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Remove the last character from the pattern buffer.
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.It REQ_NEXT_MATCH
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Attempt to find the next item that matches the pattern buffer.
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.It REQ_PREV_MATCH
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Attempt to find the previous item that matches the pattern buffer.
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.El
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If
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.Fn menu_driver
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is passed a command that is greater than MAX_COMMAND then the command
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passed is assumed to be a user defined command and
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.Fn menu_driver
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returns E_UNKNOWN_COMMAND. Otherwise if the command is a printable
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character then the character represented by the command is placed at
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the end of the pattern buffer and an attempt is made to match the
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pattern buffer against the items in the menu.
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.Sh RETURN VALUES
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The functions return one of the following error values:
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.Pp
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.Bl -tag -width E_UNKNOWN_COMMAND -compact
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.It Er E_OK
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The function was successful.
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.It Er E_SYSTEM_ERROR
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There was a system error during the call.
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.It Er E_BAD_ARGUMENT
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One or more of the arguments passed to the function was incorrect.
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.It Er E_NOT_POSTED
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The menu is not posted.
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.It Er E_UNKNOWN_COMMAND
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The menu driver does not recognise the request passed to it.
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.It Er E_NO_MATCH
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The character search failed to find a match.
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.It Er E_NOT_CONNECTED
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The item is not connected to a menu.
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.It Er E_REQUEST_DENIED
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The menu driver could not process the request.
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.El
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.Sh SEE ALSO
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.Xr curses 3 ,
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.Xr menus 3
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.Sh NOTES
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The header
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.Pa <menu.h>
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automatically includes both
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.Pa <curses.h>
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and
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.Pa <eti.h> .
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