ncurses 6.2 - patch 20210116
[ncurses.git] / doc / html / man / menu_hook.3x.html
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43 <H1 class="no-header">menu_hook 3x</H1>
44 <PRE>
45 <STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG>                                                    <STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG>
46
47
48
49
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51        <STRONG>menu_hook</STRONG> - set hooks for automatic invocation by applications
52
53
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55        <STRONG>#include</STRONG> <STRONG>&lt;menu.h&gt;</STRONG>
56
57        <STRONG>int</STRONG> <STRONG>set_item_init(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>Menu_Hook</STRONG> <EM>func);</EM>
58        <STRONG>Menu_Hook</STRONG> <STRONG>item_init(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu);</EM>
59
60        <STRONG>int</STRONG> <STRONG>set_item_term(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>Menu_Hook</STRONG> <EM>func);</EM>
61        <STRONG>Menu_Hook</STRONG> <STRONG>item_term(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu);</EM>
62
63        <STRONG>int</STRONG> <STRONG>set_menu_init(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>Menu_Hook</STRONG> <EM>func);</EM>
64        <STRONG>Menu_Hook</STRONG> <STRONG>menu_init(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu);</EM>
65
66        <STRONG>int</STRONG> <STRONG>set_menu_term(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>Menu_Hook</STRONG> <EM>func);</EM>
67        <STRONG>Menu_Hook</STRONG> <STRONG>menu_term(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu);</EM>
68
69
70 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
71        These  functions make it possible to set hook functions to be called at
72        various points in the automatic processing  of  input  event  codes  by
73        <STRONG>menu_driver</STRONG>.
74
75        The  function  <STRONG>set_item_init</STRONG> sets a hook to be called at menu-post time
76        and each time the selected item changes (after the change).   <STRONG>item_init</STRONG>
77        returns  the  current  item init hook, if any (<STRONG>NULL</STRONG> if there is no such
78        hook).
79
80        The function <STRONG>set_item_term</STRONG> sets a hook to be called at menu-unpost time
81        and each time the selected item changes (before the change).  <STRONG>item_term</STRONG>
82        returns the current item term hook, if any (<STRONG>NULL</STRONG> if there  is  no  such
83        hook).
84
85        The  function  <STRONG>set_menu_init</STRONG> sets a hook to be called at menu-post time
86        and just after the top row on the  menu  changes  once  it  is  posted.
87        <STRONG>menu_init</STRONG>  returns the current menu init hook, if any (<STRONG>NULL</STRONG> if there is
88        no such hook).
89
90        The function <STRONG>set_menu_term</STRONG> sets a hook to be called at menu-unpost time
91        and  just  before  the  top  row on the menu changes once it is posted.
92        <STRONG>menu_term</STRONG> returns the current menu term hook, if any (<STRONG>NULL</STRONG> if there  is
93        no such hook).
94
95
96 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
97        Routines  that  return  pointers  return <STRONG>NULL</STRONG> on error.  Other routines
98        return one of the following:
99
100        <STRONG>E_OK</STRONG> The routine succeeded.
101
102        <STRONG>E_SYSTEM_ERROR</STRONG>
103             System error occurred (see <STRONG>errno(3)</STRONG>).
104
105
106 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
107        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>.
108
109
110 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
111        The  header  file  <STRONG>&lt;menu.h&gt;</STRONG>  automatically  includes  the  header  file
112        <STRONG>&lt;curses.h&gt;</STRONG>.
113
114
115 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
116        These  routines  emulate the System V menu library.  They were not sup-
117        ported on Version 7 or BSD versions.
118
119
120 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
121        Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
122        Raymond.
123
124
125
126                                                                  <STRONG><A HREF="menu_hook.3x.html">menu_hook(3x)</A></STRONG>
127 </PRE>
128 <div class="nav">
129 <ul>
130 <li><a href="#h2-NAME">NAME</a></li>
131 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
132 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
133 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
134 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
135 <li><a href="#h2-NOTES">NOTES</a></li>
136 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
137 <li><a href="#h2-AUTHORS">AUTHORS</a></li>
138 </ul>
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