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* @Id: curs_touch.3x,v 1.15 2015/04/11 10:23:49 tom Exp @
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-->
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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 http://invisible-island.net/scripts/readme.html#others_scripts">
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<TITLE>curs_touch 3x</TITLE>
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<link rev=made href="mailto:bug-ncurses@gnu.org">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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</HEAD>
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<BODY>
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<H1 class="no-header">curs_touch 3x</H1>
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<PRE>
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<STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG> <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
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</PRE>
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<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> - <STRONG>curses</STRONG> refresh control routines
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</PRE>
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<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>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
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<STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
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<STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
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<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>
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<STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
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<STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
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</PRE>
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<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 opti-
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mization information about which parts of the window have
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been touched, by pretending that the entire window has
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been drawn on. This is sometimes necessary when using
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overlapping windows, since a change to one window affects
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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.
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The routine <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
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been changed, beginning with line <EM>start</EM>.
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The <STRONG>untouchwin</STRONG> routine marks all lines in the window as
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unchanged since 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
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at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not
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(<EM>changed</EM><STRONG>=0</STRONG>) been changed 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>
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if the specified line/window was modified since the last
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call to <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>. In addi-
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tion, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid for
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the given window.
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</PRE>
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<H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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All routines return the integer <STRONG>ERR</STRONG> upon failure and an
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integer value other than <STRONG>ERR</STRONG> upon successful completion,
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unless otherwise noted in the preceding routine descrip-
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tions.
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X/Open does not define any error conditions. In this im-
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plementation
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<STRONG>is_linetouched</STRONG>
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returns an error if the window pointer is
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null, or if the line number is outside the
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window. Note that ERR is distinct from <STRONG>TRUE</STRONG>
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and <STRONG>FALSE</STRONG>, which are the normal return values
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of this function.
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<STRONG>wtouchln</STRONG>
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returns an error if the window pointer is
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null, or if the line number is outside the
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window.
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</PRE>
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<H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
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The XSI Curses standard, Issue 4 describes these func-
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tions.
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Some historic curses implementations had, as an undocu-
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mented feature, the ability to do the equivalent of
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<STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
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<STRONG>scr)</STRONG>. This will not work under ncurses.
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</PRE>
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<H2><a name="h2-NOTES">NOTES</a></H2><PRE>
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Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
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</PRE>
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<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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<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-PORTABILITY">PORTABILITY</a></li>
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<li><a href="#h2-NOTES">NOTES</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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</BODY>
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</HTML>
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