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<PRE>
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</PRE>
<H2>NAME</H2><PRE>
<B>touchwin</B>, <B>touchline</B>, <B>untouchwin</B>, <B>wtouchln</B>, <B>is_linetouched</B>,
<B>is_wintouched</B> - <B>curses</B> refresh control routines
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>#include</B> <B><curses.h></B>
<B>int</B> <B>touchwin(WINDOW</B> <B>*win);</B>
<B>int</B> <B>touchline(WINDOW</B> <B>*win,</B> <B>int</B> <B>start,</B> <B>int</B> <B>count);</B>
<B>int</B> <B>untouchwin(WINDOW</B> <B>*win);</B>
<B>int</B> <B>wtouchln(WINDOW</B> <B>*win,</B> <B>int</B> <B>y,</B> <B>int</B> <B>n,</B> <B>int</B> <B>changed);</B>
<B>bool</B> <B>is_linetouched(WINDOW</B> <B>*win,</B> <B>int</B> <B>line);</B>
<B>bool</B> <B>is_wintouched(WINDOW</B> <B>*win);</B>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <B>touchwin</B> and <B>touchline</B> routines throw away all opti-
mization information about which parts of the window have
been touched, by pretending that the entire window has
been drawn on. This is sometimes necessary when using
overlapping windows, since a change to one window affects
the other window, but the records of which lines have been
changed in the other window do not reflect the change.
The routine <B>touchline</B> only pretends that <I>count</I> lines have
been changed, beginning with line <I>start</I>.
The <B>untouchwin</B> routine marks all lines in the window as
unchanged since the last call to <B>wrefresh</B>.
The <B>wtouchln</B> routine makes <I>n</I> lines in the window, starting
at line <I>y</I>, look as if they have (<I>changed</I><B>=1</B>) or have not
(<I>changed</I><B>=0</B>) been changed since the last call to <B>wrefresh</B>.
The <B>is_linetouched</B> and <B>is_wintouched</B> routines return <B>TRUE</B>
if the specified line/window was modified since the last
call to <B>wrefresh</B>; otherwise they return <B>FALSE</B>. In addi-
tion, <B>is_linetouched</B> returns <B>ERR</B> if <I>line</I> is not valid for
the given window.
</PRE>
<H2>RETURN VALUE</H2><PRE>
All routines return the integer <B>ERR</B> upon failure and an
integer value other than <B>ERR</B> upon successful completion,
unless otherwise noted in the preceding routine descrip-
tions.
</PRE>
<H2>PORTABILITY</H2><PRE>
The XSI Curses standard, Issue 4 describes these func-
tions.
Some historic curses implementations had, as an undocu-
mented feature, the ability to do the equivalent of
<B>clearok(...,</B> <B>1)</B> by saying <B>touchwin(stdscr)</B> or <B>clear(std-</B>
<B>scr)</B>. This will not work under ncurses.
</PRE>
<H2>NOTES</H2><PRE>
Note that all routines except <B>wtouchln</B> may be macros.
</PRE>
<H2>SEE ALSO</H2><PRE>
<B><A HREF="ncurses.3x.html">curses(3x)</A></B>, <B><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></B>.
</PRE>
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