]> ncurses.scripts.mit.edu Git - ncurses.git/blob - doc/html/man/curs_touch.3x.html
ncurses 6.4 - patch 20231125
[ncurses.git] / doc / html / man / curs_touch.3x.html
1 <!--
2   ****************************************************************************
3   * Copyright 2018-2022,2023 Thomas E. Dickey                                *
4   * Copyright 1998-2015,2017 Free Software Foundation, Inc.                  *
5   *                                                                          *
6   * Permission is hereby granted, free of charge, to any person obtaining a  *
7   * copy of this software and associated documentation files (the            *
8   * "Software"), to deal in the Software without restriction, including      *
9   * without limitation the rights to use, copy, modify, merge, publish,      *
10   * distribute, distribute with modifications, sublicense, and/or sell       *
11   * copies of the Software, and to permit persons to whom the Software is    *
12   * furnished to do so, subject to the following conditions:                 *
13   *                                                                          *
14   * The above copyright notice and this permission notice shall be included  *
15   * in all copies or substantial portions of the Software.                   *
16   *                                                                          *
17   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
18   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
19   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
20   * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
21   * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
22   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
23   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
24   *                                                                          *
25   * Except as contained in this notice, the name(s) of the above copyright   *
26   * holders shall not be used in advertising or otherwise to promote the     *
27   * sale, use or other dealings in this Software without prior written       *
28   * authorization.                                                           *
29   ****************************************************************************
30   * @Id: curs_touch.3x,v 1.42 2023/11/25 14:08:05 tom Exp @
31 -->
32 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
33 <HTML>
34 <HEAD>
35 <meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
36 <meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
37 <TITLE>curs_touch 3x 2023-11-25 ncurses 6.4 Library calls</TITLE>
38 <link rel="author" href="mailto:bug-ncurses@gnu.org">
39
40 </HEAD>
41 <BODY>
42 <H1 class="no-header">curs_touch 3x 2023-11-25 ncurses 6.4 Library calls</H1>
43 <PRE>
44 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>                   Library calls                  <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
45
46
47
48
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50        <STRONG>touchwin</STRONG>,     <STRONG>touchline</STRONG>,    <STRONG>untouchwin</STRONG>,    <STRONG>wtouchln</STRONG>,    <STRONG>is_linetouched</STRONG>,
51        <STRONG>is_wintouched</STRONG> - control terminal output refresh in a <EM>curses</EM> window
52
53
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
56
57        <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>start</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>count</EM><STRONG>);</STRONG>
58
59        <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
60        <STRONG>int</STRONG> <STRONG>wtouchln(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>y</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>n</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>changed</EM><STRONG>);</STRONG>
61
62        <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
63
64        <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>line</EM><STRONG>);</STRONG>
65        <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
66
67
68 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
69        The  <STRONG>touchwin</STRONG>  and  <STRONG>touchline</STRONG>  routines  throw  away  all  optimization
70        information  about  which  parts  of  the  window have been touched, by
71        pretending that the entire window has been drawn on.  This is sometimes
72        necessary  when using overlapping windows, since a change to one window
73        affects the other window, but the records  of  which  lines  have  been
74        changed  in  the  other  window do not reflect the change.  The routine
75        <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have been  changed,  beginning
76        with line <EM>start</EM>.
77
78        The <STRONG>untouchwin</STRONG> routine marks all lines in the window as unchanged since
79        the last call to <STRONG>wrefresh</STRONG>.
80
81        The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting at  line  <EM>y</EM>,
82        look  as  if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not (<EM>changed</EM><STRONG>=0</STRONG>) been changed
83        since the last call to <STRONG>wrefresh</STRONG>.
84
85        The <STRONG>is_linetouched</STRONG>  and  <STRONG>is_wintouched</STRONG>  routines  return  <STRONG>TRUE</STRONG>  if  the
86        specified  line/window  was  modified  since the last call to <STRONG>wrefresh</STRONG>;
87        otherwise they return <STRONG>FALSE</STRONG>.  In addition, <STRONG>is_linetouched</STRONG>  returns  <STRONG>ERR</STRONG>
88        if <EM>line</EM> is not valid for the given window.
89
90
91 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
92        All  routines  return the integer <STRONG>ERR</STRONG> upon failure and an integer value
93        other than <STRONG>ERR</STRONG> upon successful completion, unless  otherwise  noted  in
94        the preceding routine descriptions.
95
96        X/Open does not define any error conditions.  In this implementation
97
98           <STRONG>is_linetouched</STRONG>
99                returns  an error if the window pointer is null, or if the line
100                number is outside the window.
101
102                The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
103                normal  return  values  of this function.  Because the function
104                returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
105                may not be supported by the compiler.
106
107                To  provide  error-checking  and also match the X/Open function
108                prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
109                The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
110
111           <STRONG>wtouchln</STRONG>
112                returns  an error if the window pointer is null, or if the line
113                number is outside the window.
114
115
116 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
117        All of these routines except <STRONG>wtouchln</STRONG> may be macros.
118
119
120 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
121        These functions were introduced by SVr4.   The  Solaris  <EM>curses</EM>  header
122        file, for instance, defines both an actual function and macro for each.
123        The macros give the same result as the actual functions.   SVr4  <EM>curses</EM>
124        does  not check the window parameter <EM>win</EM> to ensure that it is not <STRONG>NULL</STRONG>;
125        otherwise this implementation behaves the same as SVr4.
126
127        The XSI Curses standard, Issue 4 describes these functions, but defines
128        no error conditions.
129
130
131 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
132        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
133
134
135
136 ncurses 6.4                       2023-11-25                    <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
137 </PRE>
138 <div class="nav">
139 <ul>
140 <li><a href="#h2-NAME">NAME</a></li>
141 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
142 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
143 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
144 <li><a href="#h2-NOTES">NOTES</a></li>
145 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
146 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
147 </ul>
148 </div>
149 </BODY>
150 </HTML>