doc/html/man/curs_touch.3x.html

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  34 <TITLE>curs_touch 3x</TITLE>
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  39 <H1>curs_touch 3x</H1>
  40 <HR>
  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>                                           <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</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>
  55 <H2>SYNOPSIS</H2><PRE>
  56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57        <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
  58        <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
  60        <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>
  61        <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
  62        <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
  63
  64
  65 </PRE>
  66 <H2>DESCRIPTION</H2><PRE>
  67        The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away  all  opti-
  68        mization  information about which parts of the window have
  69        been touched, by pretending that  the  entire  window  has
  70        been  drawn  on.   This  is sometimes necessary when using
  71        overlapping windows, since a change to one window  affects
  72        the other window, but the records of which lines have been
  73        changed in the other window do  not  reflect  the  change.
  74        The  routine <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
  75        been changed, beginning with line <EM>start</EM>.
  76
  77        The <STRONG>untouchwin</STRONG> routine marks all lines in  the  window  as
  78        unchanged since the last call to <STRONG>wrefresh</STRONG>.
  79
  80        The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting
  81        at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>)  or  have  not
  82        (<EM>changed</EM><STRONG>=0</STRONG>) been changed 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>
  85        if the specified line/window was modified since  the  last
  86        call  to  <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>.  In addi-
  87        tion, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid  for
  88        the given window.
  89
  90
  91 </PRE>
  92 <H2>RETURN VALUE</H2><PRE>
  93        All  routines  return  the integer <STRONG>ERR</STRONG> upon failure and an
  94        integer value other than <STRONG>ERR</STRONG> upon  successful  completion,
  95        unless  otherwise  noted in the preceding routine descrip-
  96        tions.
  97
  98        X/Open does not define any error conditions.  In this  im-
  99        plementation
 100
 101               <STRONG>is_linetouched</STRONG>
 102                    returns  an  error  if  the  window pointer is
 103                    null, or if the line  number  is  outside  the
 104                    window.   Note  that ERR is distinct from TRUE
 105                    and FALSE, which are the normal return  values
 106                    of this function.
 107
 108               <STRONG>wtouchln</STRONG>
 109                    returns  an  error  if  the  window pointer is
 110                    null, or if the line  number  is  outside  the
 111                    window.
 112
 113
 114 </PRE>
 115 <H2>PORTABILITY</H2><PRE>
 116        The  XSI  Curses  standard,  Issue 4 describes these func-
 117        tions.
 118
 119        Some historic curses implementations had,  as  an  undocu-
 120        mented  feature,  the  ability  to  do  the  equivalent of
 121        <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG>  or  <STRONG>clear(std-</STRONG>
 122        <STRONG>scr)</STRONG>.  This will not work under ncurses.
 123
 124
 125 </PRE>
 126 <H2>NOTES</H2><PRE>
 127        Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
 128
 129
 130 </PRE>
 131 <H2>SEE ALSO</H2><PRE>
 132        <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>.
 133
 134
 135
 136                                                          <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
 137 </PRE>
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