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<H1 class="no-header">curs_touch 3x 2025-01-18 ncurses 6.6 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
<STRONG>is_wintouched</STRONG> - control terminal output refresh in a <EM>curses</EM> window
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<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>
<STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
<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>
<STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
<STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>line</EM><STRONG>);</STRONG>
<STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all optimization
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 addition, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG>
if <EM>line</EM> is not valid for the given window.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
Functions returning integers return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> upon
success.
In <EM>ncurses</EM>,
<STRONG>is_linetouched</STRONG>
returns <STRONG>ERR</STRONG> if the window pointer is null, or if the line
number is outside the window boundaries.
The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
normal return values of this function. Because the function
returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
may not be supported by the compiler.
To provide error-checking and also match the X/Open function
prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
<STRONG>wtouchln</STRONG>
returns <STRONG>ERR</STRONG> if the window pointer is null, or if the line
number is outside the window boundaries.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
All of these functions except <STRONG>wtouchln</STRONG> may be implemented as macros.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
X/Open Curses Issue 4 describes these functions. It specifies no error
conditions for them.
SVr4 describes a successful return value except where "otherwise noted"
as "an integer value other than <EM>ERR</EM>".
SVr4 does not check <EM>win</EM> to ensure that it is not a null pointer.
</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
SVr2 (1984) introduced <EM>touchwin</EM>,
SVr3 (1987) added <EM>touchline</EM>. SVr3.1 later that year supplied
<EM>is</EM><STRONG>_</STRONG><EM>linetouched</EM>, <EM>is</EM><STRONG>_</STRONG><EM>wintouched</EM>, <EM>untouchwin</EM>, and <EM>wtouchln</EM>.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></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>
ncurses 6.6 2025-01-18 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
</PRE>
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<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-HISTORY">HISTORY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
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