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