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133 lines
6.8 KiB
HTML
133 lines
6.8 KiB
HTML
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* Copyright 2018-2023,2024 Thomas E. Dickey *
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* @Id: mitem_current.3x,v 1.39 2024/12/28 21:26:21 tom Exp @
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-->
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<HTML>
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<HEAD>
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
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<TITLE>mitem_current 3x 2024-12-28 ncurses 6.6 Library calls</TITLE>
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<link rel="author" href="mailto:bug-ncurses@gnu.org">
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</HEAD>
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<BODY>
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<H1 class="no-header">mitem_current 3x 2024-12-28 ncurses 6.6 Library calls</H1>
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<PRE>
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<STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG> Library calls <STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG>
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</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
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<STRONG>mitem_current</STRONG> - set and get current_menu_item
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</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
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<STRONG>#include</STRONG> <STRONG><menu.h></STRONG>
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<STRONG>int</STRONG> <STRONG>set_current_item(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>ITEM</STRONG> <STRONG>*</STRONG><EM>item</EM><STRONG>);</STRONG>
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<STRONG>ITEM</STRONG> <STRONG>*current_item(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>);</STRONG>
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<STRONG>int</STRONG> <STRONG>set_top_row(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>row</EM><STRONG>);</STRONG>
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<STRONG>int</STRONG> <STRONG>top_row(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>);</STRONG>
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<STRONG>int</STRONG> <STRONG>item_index(const</STRONG> <STRONG>ITEM</STRONG> <STRONG>*</STRONG><EM>item</EM><STRONG>);</STRONG>
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</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
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The function <STRONG>set_current_item</STRONG> sets the current item (the item on which
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the menu cursor is positioned). <STRONG>current_item</STRONG> returns a pointer to the
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current item in the given menu.
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The function <STRONG>set_top_row</STRONG> sets the top row of the menu to show the given
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row (the top row is initially 0, and is reset to this value whenever
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the <STRONG>O_ROWMAJOR</STRONG> option is toggled). The item leftmost on the given row
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becomes current. The function <STRONG>top_row</STRONG> returns the number of the top
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menu row being displayed.
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The function <STRONG>item_index</STRONG> returns the (zero-origin) index of <EM>item</EM> in the
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menu's item pointer list.
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</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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<STRONG>current_item</STRONG> returns a pointer (which may be <EM>NULL</EM>). It does not set
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<STRONG>errno</STRONG>.
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<STRONG>top_row</STRONG> and <STRONG>item_index</STRONG> return <STRONG>ERR</STRONG> (the general <STRONG>curses</STRONG> error value) if
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their <EM>menu</EM> parameter is <EM>NULL</EM>.
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<STRONG>set_current_item</STRONG> and <STRONG>set_top_row</STRONG> return one of the following:
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<STRONG>E_OK</STRONG> The routine succeeded.
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<STRONG>E_BAD_ARGUMENT</STRONG>
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Routine detected an incorrect or out-of-range argument.
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<STRONG>E_BAD_STATE</STRONG>
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Routine was called from an initialization or termination function.
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<STRONG>E_NOT_CONNECTED</STRONG>
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No items are connected to the menu.
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<STRONG>E_SYSTEM_ERROR</STRONG>
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System error occurred (see <STRONG>errno(3)</STRONG>).
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</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
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These routines emulate the System V menu library. They were not
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supported on Version 7 or BSD versions.
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The SVr4 menu library documentation specifies the <STRONG>top_row</STRONG> and
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<STRONG>index_item</STRONG> error value as -1 (which is the value of <STRONG>ERR</STRONG>).
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</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
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Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
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Raymond.
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</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>
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ncurses 6.6 2024-12-28 <STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG>
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</PRE>
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<div class="nav">
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<ul>
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<li><a href="#h2-NAME">NAME</a></li>
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<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
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<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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<li><a href="#h2-AUTHORS">AUTHORS</a></li>
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<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
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</ul>
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</div>
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