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37 <TITLE>curs_touch 3x 2024-03-16 ncurses 6.4 Library calls</TITLE>
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42 <H1 class="no-header">curs_touch 3x 2024-03-16 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   Curses  does  not  specify  any  error  conditions.   In  this
97        implementation
98
99           <STRONG>is_linetouched</STRONG>
100                returns an error if the window pointer is null, or if the  line
101                number is outside the window.
102
103                The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
104                normal return values of this function.   Because  the  function
105                returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
106                may not be supported by the compiler.
107
108                To provide error-checking and also match  the  X/Open  function
109                prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
110                The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
111
112           <STRONG>wtouchln</STRONG>
113                returns an error if the window pointer is null, or if the  line
114                number is outside the window.
115
116
117 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
118        All of these routines except <STRONG>wtouchln</STRONG> may be macros.
119
120
121 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
122        These  functions  were  introduced  by SVr4.  The Solaris <EM>curses</EM> header
123        file, for instance, defines both an actual function and macro for each.
124        The  macros  give the same result as the actual functions.  SVr4 <EM>curses</EM>
125        does not check the window parameter <EM>win</EM> to ensure that it is not  <STRONG>NULL</STRONG>;
126        otherwise this implementation behaves the same as SVr4.
127
128        The XSI Curses standard, Issue 4 describes these functions, but defines
129        no error conditions.
130
131
132 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
133        <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>
134
135
136
137 ncurses 6.4                       2024-03-16                    <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
138 </PRE>
139 <div class="nav">
140 <ul>
141 <li><a href="#h2-NAME">NAME</a></li>
142 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
143 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
144 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
145 <li><a href="#h2-NOTES">NOTES</a></li>
146 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
147 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
148 </ul>
149 </div>
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