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* @Id: menu_hook.3x,v 1.14 2020/02/02 23:34:34 tom Exp @
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<H1 class="no-header">menu_hook 3x</H1>
<PRE>
<STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG> <STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>menu_hook</STRONG> - set hooks for automatic invocation by applications
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG>&lt;menu.h&gt;</STRONG>
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);
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
These functions make it possible to set hook functions to be called at
various points in the automatic processing of input event codes by
<STRONG>menu_driver</STRONG>.
The function <STRONG>set_item_init</STRONG> sets a hook to be called at menu-post time
and each time the selected item changes (after the change). <STRONG>item_init</STRONG>
returns the current item init hook, if any (<STRONG>NULL</STRONG> if there is no such
hook).
The function <STRONG>set_item_term</STRONG> sets a hook to be called at menu-unpost time
and each time the selected item changes (before the change). <STRONG>item_term</STRONG>
returns the current item term hook, if any (<STRONG>NULL</STRONG> if there is no such
hook).
The function <STRONG>set_menu_init</STRONG> sets a hook to be called at menu-post time
and just after the top row on the menu changes once it is posted.
<STRONG>menu_init</STRONG> returns the current menu init hook, if any (<STRONG>NULL</STRONG> if there is
no such hook).
The function <STRONG>set_menu_term</STRONG> sets a hook to be called at menu-unpost time
and just before the top row on the menu changes once it is posted.
<STRONG>menu_term</STRONG> returns the current menu term hook, if any (<STRONG>NULL</STRONG> if there is
no such hook).
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
Routines that return pointers return <STRONG>NULL</STRONG> on error. Other routines
return one of the following:
<STRONG>E_OK</STRONG> The routine succeeded.
<STRONG>E_SYSTEM_ERROR</STRONG>
System error occurred (see <STRONG>errno(3)</STRONG>).
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
The header file <STRONG>&lt;menu.h&gt;</STRONG> automatically includes the header file
<STRONG>&lt;curses.h&gt;</STRONG>.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These routines emulate the System V menu library. They were not sup-
ported on Version 7 or BSD versions.
</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
Raymond.
<STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG>
</PRE>
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<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-AUTHORS">AUTHORS</a></li>
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