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41 <H1>curs_touch 3x</H1>
42 <HR>
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>
50 <H2><a name="h2-NAME">NAME</a></H2><PRE>
51        <STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
52        <STRONG>is_wintouched</STRONG> - <STRONG>curses</STRONG> refresh control routines
53
54
55 </PRE>
56 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
57        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
58        <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
59        <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
60        <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
61        <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>
62        <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
63        <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
64
65
66 </PRE>
67 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
68        The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away  all  opti-
69        mization  information about which parts of the window have
70        been touched, by pretending that  the  entire  window  has
71        been  drawn  on.   This  is sometimes necessary when using
72        overlapping windows, since a change to one window  affects
73        the other window, but the records of which lines have been
74        changed in the other window do  not  reflect  the  change.
75        The  routine <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
76        been changed, beginning with line <EM>start</EM>.
77
78        The <STRONG>untouchwin</STRONG> routine marks all lines in  the  window  as
79        unchanged since the last call to <STRONG>wrefresh</STRONG>.
80
81        The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting
82        at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>)  or  have  not
83        (<EM>changed</EM><STRONG>=0</STRONG>) been changed 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>
86        if the specified line/window was modified since  the  last
87        call  to  <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>.  In addi-
88        tion, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid  for
89        the given window.
90
91
92 </PRE>
93 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
94        All  routines  return  the integer <STRONG>ERR</STRONG> upon failure and an
95        integer value other than <STRONG>ERR</STRONG> upon  successful  completion,
96        unless  otherwise  noted in the preceding routine descrip-
97        tions.
98
99        X/Open does not define any error conditions.  In this  im-
100        plementation
101
102               <STRONG>is_linetouched</STRONG>
103                    returns  an  error  if  the  window pointer is
104                    null, or if the line  number  is  outside  the
105                    window.   Note  that ERR is distinct from TRUE
106                    and FALSE, which are the normal return  values
107                    of this function.
108
109               <STRONG>wtouchln</STRONG>
110                    returns  an  error  if  the  window pointer is
111                    null, or if the line  number  is  outside  the
112                    window.
113
114
115 </PRE>
116 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
117        The  XSI  Curses  standard,  Issue 4 describes these func-
118        tions.
119
120        Some historic curses implementations had,  as  an  undocu-
121        mented  feature,  the  ability  to  do  the  equivalent of
122        <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG>  or  <STRONG>clear(std-</STRONG>
123        <STRONG>scr)</STRONG>.  This will not work under ncurses.
124
125
126 </PRE>
127 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
128        Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
129
130
131 </PRE>
132 <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                                                          <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-PORTABILITY">PORTABILITY</a></li>
146 <li><a href="#h2-NOTES">NOTES</a></li>
147 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
148 </ul>
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