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* @Id: curs_touch.3x,v 1.14 2010/12/04 18:38:55 tom Exp @
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<H1>curs_touch 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG> <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
<STRONG>is_wintouched</STRONG> - <STRONG>curses</STRONG> refresh control routines
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
<STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
<STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
<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>
<STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
<STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
</PRE>
<H2>DESCRIPTION</H2><PRE>
The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> 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 <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
been changed, beginning with line <EM>start</EM>.
The <STRONG>untouchwin</STRONG> routine marks all lines in the window as
unchanged since the last call to <STRONG>wrefresh</STRONG>.
The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting
at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not
(<EM>changed</EM><STRONG>=0</STRONG>) been changed since the last call to <STRONG>wrefresh</STRONG>.
The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG>
if the specified line/window was modified since the last
call to <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>. In addi-
tion, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid for
the given window.
</PRE>
<H2>RETURN VALUE</H2><PRE>
All routines return the integer <STRONG>ERR</STRONG> upon failure and an
integer value other than <STRONG>ERR</STRONG> upon successful completion,
unless otherwise noted in the preceding routine descrip-
tions.
X/Open does not define any error conditions. In this im-
plementation
<STRONG>is_linetouched</STRONG>
returns an error if the window pointer is
null, or if the line number is outside the
window. Note that ERR is distinct from TRUE
and FALSE, which are the normal return values
of this function.
<STRONG>wtouchln</STRONG>
returns an error if the window pointer is
null, or if the line number is outside the
window.
</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
<STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
<STRONG>scr)</STRONG>. This will not work under ncurses.
</PRE>
<H2>NOTES</H2><PRE>
Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
</PRE>
<H2>SEE ALSO</H2><PRE>
<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>.
<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE>
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