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  41 <H1>curs_touch 3x</H1>
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  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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