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42 <H1 class="no-header">curs_touch 3x</H1>
43 <PRE>
44 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>                                                  <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> - <STRONG>curses</STRONG> refresh control routines
52
53
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
56        <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
57        <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
58        <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
59        <STRONG>int</STRONG> <STRONG>wtouchln(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>n,</STRONG> <STRONG>int</STRONG> <STRONG>changed);</STRONG>
60        <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
61        <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
62
63
64 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
65        The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all optimization  infor-
66        mation about which parts of the window have been touched, by pretending
67        that the entire window has been drawn on.  This is sometimes  necessary
68        when  using  overlapping  windows, since a change to one window affects
69        the other window, but the records of which lines have been  changed  in
70        the other window do not reflect the change.  The routine <STRONG>touchline</STRONG> only
71        pretends that <EM>count</EM> lines have been changed, beginning with line <EM>start</EM>.
72
73        The <STRONG>untouchwin</STRONG> routine marks all lines in the window as unchanged since
74        the last call to <STRONG>wrefresh</STRONG>.
75
76        The  <STRONG>wtouchln</STRONG>  routine makes <EM>n</EM> lines in the window, starting at line <EM>y</EM>,
77        look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not (<EM>changed</EM><STRONG>=0</STRONG>)  been  changed
78        since the last call to <STRONG>wrefresh</STRONG>.
79
80        The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG> if the speci-
81        fied line/window was modified since the last call to  <STRONG>wrefresh</STRONG>;  other-
82        wise  they  return  <STRONG>FALSE</STRONG>.   In addition, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if
83        <EM>line</EM> is not valid for the given window.
84
85
86 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
87        All routines return the integer <STRONG>ERR</STRONG> upon failure and an  integer  value
88        other  than  <STRONG>ERR</STRONG>  upon successful completion, unless otherwise noted in
89        the preceding routine descriptions.
90
91        X/Open does not define any error conditions.  In this implementation
92
93           <STRONG>is_linetouched</STRONG>
94                returns an error if the window pointer is null, or if the  line
95                number is outside the window.
96
97                The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
98                normal return values of this function.   Because  the  function
99                returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
100                may not be supported by the compiler.
101
102                To provide error-checking and also match  the  X/Open  function
103                prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
104                The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
105
106           <STRONG>wtouchln</STRONG>
107                returns an error if the window pointer is null, or if the  line
108                number is outside the window.
109
110
111 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
112        These  functions  were  introduced  by SVr4.  The Solaris curses header
113        file, for instance, defines both an actual function and macro for each.
114        The  macros  give the same result as the actual functions.  SVr4 curses
115        does not check the window parameter <EM>win</EM> to ensure that it is not  <STRONG>NULL</STRONG>;
116        otherwise this implementation behaves the same as SVr4.
117
118        The XSI Curses standard, Issue 4 describes these functions, but defines
119        no error conditions.
120
121
122 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
123        All of these routines except <STRONG>wtouchln</STRONG> may be macros.
124
125
126 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
127        <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>.
128
129
130
131                                                                 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
132 </PRE>
133 <div class="nav">
134 <ul>
135 <li><a href="#h2-NAME">NAME</a></li>
136 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
137 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
138 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
139 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
140 <li><a href="#h2-NOTES">NOTES</a></li>
141 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
142 </ul>
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