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* @Id: curs_touch.3x,v 1.63 2025/01/19 00:51:10 tom Exp @
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<HTML>
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<HEAD>
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<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
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<TITLE>curs_touch 3x 2025-01-18 ncurses 6.6 Library calls</TITLE>
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<link rel="author" href="mailto:bug-ncurses@gnu.org">
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</HEAD>
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<BODY>
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<H1 class="no-header">curs_touch 3x 2025-01-18 ncurses 6.6 Library calls</H1>
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<PRE>
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<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>
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</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
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<STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
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<STRONG>is_wintouched</STRONG> - control terminal output refresh in a <EM>curses</EM> window
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</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
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<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
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<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>
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<STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
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<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>
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<STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
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<STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>line</EM><STRONG>);</STRONG>
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<STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>);</STRONG>
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</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
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The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all optimization
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information about which parts of the window have been touched, by
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pretending that the entire window has been drawn on. This is sometimes
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necessary when using overlapping windows, since a change to one window
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affects the other window, but the records of which lines have been
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changed in the other window do not reflect the change. The routine
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<STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have been changed, beginning
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with line <EM>start</EM>.
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The <STRONG>untouchwin</STRONG> routine marks all lines in the window as unchanged since
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the last call to <STRONG>wrefresh</STRONG>.
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The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting at line <EM>y</EM>,
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look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not (<EM>changed</EM><STRONG>=0</STRONG>) been changed
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since the last call to <STRONG>wrefresh</STRONG>.
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The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG> if the
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specified line/window was modified since the last call to <STRONG>wrefresh</STRONG>;
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otherwise they return <STRONG>FALSE</STRONG>. In addition, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG>
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if <EM>line</EM> is not valid for the given window.
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</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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Functions returning integers return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> upon
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success.
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In <EM>ncurses</EM>,
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<STRONG>is_linetouched</STRONG>
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returns <STRONG>ERR</STRONG> if the window pointer is null, or if the line
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number is outside the window boundaries.
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The constant <STRONG>ERR</STRONG> is distinct from <STRONG>TRUE</STRONG> and <STRONG>FALSE</STRONG>, which are the
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normal return values of this function. Because the function
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returns a <STRONG>bool</STRONG>, returning <STRONG>ERR</STRONG> (which is neither <STRONG>TRUE</STRONG> nor <STRONG>FALSE</STRONG>)
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may not be supported by the compiler.
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To provide error-checking and also match the X/Open function
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prototype, the <STRONG>ERR</STRONG> is provided by a macro named <STRONG>is_linetouched</STRONG>.
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The actual function returns <STRONG>FALSE</STRONG> when it detects an error.
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<STRONG>wtouchln</STRONG>
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returns <STRONG>ERR</STRONG> if the window pointer is null, or if the line
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number is outside the window boundaries.
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</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
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All of these functions except <STRONG>wtouchln</STRONG> may be implemented as macros.
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</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
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X/Open Curses Issue 4 describes these functions. It specifies no error
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conditions for them.
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SVr4 describes a successful return value except where "otherwise noted"
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as "an integer value other than <EM>ERR</EM>".
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SVr4 does not check <EM>win</EM> to ensure that it is not a null pointer.
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</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
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SVr2 (1984) introduced <EM>touchwin</EM>,
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SVr3 (1987) added <EM>touchline</EM>. SVr3.1 later that year supplied
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<EM>is</EM><STRONG>_</STRONG><EM>linetouched</EM>, <EM>is</EM><STRONG>_</STRONG><EM>wintouched</EM>, <EM>untouchwin</EM>, and <EM>wtouchln</EM>.
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</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
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<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>
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ncurses 6.6 2025-01-18 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
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</PRE>
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<div class="nav">
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<ul>
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<li><a href="#h2-NAME">NAME</a></li>
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<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#h2-DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
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<li><a href="#h2-NOTES">NOTES</a></li>
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<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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<li><a href="#h2-HISTORY">HISTORY</a></li>
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<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
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</ul>
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</div>
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