ncurses 6.2 - patch 20210508
[ncurses.git] / doc / html / man / mitem_current.3x.html
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43 <H1 class="no-header">mitem_current 3x</H1>
44 <PRE>
45 <STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG>                                            <STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG>
46
47
48
49
50 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
51        <STRONG>mitem_current</STRONG> - set and get current_menu_item
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_current_item(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>ITEM</STRONG> <STRONG>*</STRONG><EM>item</EM><STRONG>);</STRONG>
58        <STRONG>ITEM</STRONG> <STRONG>*current_item(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>);</STRONG>
59
60        <STRONG>int</STRONG> <STRONG>set_top_row(MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>row</EM><STRONG>);</STRONG>
61        <STRONG>int</STRONG> <STRONG>top_row(const</STRONG> <STRONG>MENU</STRONG> <STRONG>*</STRONG><EM>menu</EM><STRONG>);</STRONG>
62
63        <STRONG>int</STRONG> <STRONG>item_index(const</STRONG> <STRONG>ITEM</STRONG> <STRONG>*</STRONG><EM>item</EM><STRONG>);</STRONG>
64
65
66 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
67        The  function <STRONG>set_current_item</STRONG> sets the current item (the item on which
68        the menu cursor is positioned).  <STRONG>current_item</STRONG> returns a pointer to  the
69        current item in the given menu.
70
71        The function <STRONG>set_top_row</STRONG> sets the top row of the menu to show the given
72        row (the top row is initially 0, and is reset to  this  value  whenever
73        the  <STRONG>O_ROWMAJOR</STRONG> option is toggled).  The item leftmost on the given row
74        becomes current.  The function <STRONG>top_row</STRONG> returns the number  of  the  top
75        menu row being displayed.
76
77        The  function <STRONG>item_index</STRONG> returns the (zero-origin) index of <EM>item</EM> in the
78        menu's item pointer list.
79
80
81 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
82        <STRONG>current_item</STRONG> returns a pointer (which may be <STRONG>NULL</STRONG>).  It  does  not  set
83        <STRONG>errno</STRONG>.
84
85        <STRONG>top_row</STRONG>  and  <STRONG>item_index</STRONG> return <STRONG>ERR</STRONG> (the general <STRONG>curses</STRONG> error value) if
86        their <EM>menu</EM> parameter is <STRONG>NULL</STRONG>.
87
88        <STRONG>set_current_item</STRONG> and <STRONG>set_top_row</STRONG> return one of the following:
89
90        <STRONG>E_OK</STRONG> The routine succeeded.
91
92        <STRONG>E_BAD_ARGUMENT</STRONG>
93             Routine detected an incorrect or out-of-range argument.
94
95        <STRONG>E_BAD_STATE</STRONG>
96             Routine was called from an initialization or termination function.
97
98        <STRONG>E_NOT_CONNECTED</STRONG>
99             No items are connected to the menu.
100
101        <STRONG>E_SYSTEM_ERROR</STRONG>
102             System error occurred (see <STRONG>errno(3)</STRONG>).
103
104
105 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
106        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>.
107
108
109 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
110        The  header  file  <STRONG>&lt;menu.h&gt;</STRONG>  automatically  includes  the  header  file
111        <STRONG>&lt;curses.h&gt;</STRONG>.
112
113
114 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
115        These  routines  emulate  the  System  V  menu  library.  They were not
116        supported on Version 7 or BSD versions.
117
118        The  SVr4  menu  library  documentation  specifies  the   <STRONG>top_row</STRONG>   and
119        <STRONG>index_item</STRONG> error value as -1 (which is the value of <STRONG>ERR</STRONG>).
120
121
122 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
123        Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.
124        Raymond.
125
126
127
128                                                              <STRONG><A HREF="mitem_current.3x.html">mitem_current(3x)</A></STRONG>
129 </PRE>
130 <div class="nav">
131 <ul>
132 <li><a href="#h2-NAME">NAME</a></li>
133 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
134 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
135 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
136 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
137 <li><a href="#h2-NOTES">NOTES</a></li>
138 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
139 <li><a href="#h2-AUTHORS">AUTHORS</a></li>
140 </ul>
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