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761e4f0825
+ corrected ifdefs in test/testcurs.c to allow comparison of mouse interface versus pdcurses (cf: 20130316). + add pow() to configure-check for math library, needed since 20121208 for test/hanoi (Debian #708056). + regenerated html manpages. + update doctype used for html documentation.
132 lines
5.7 KiB
HTML
132 lines
5.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
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<!--
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****************************************************************************
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* Copyright (c) 1998-2006,2010 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* The above copyright notice and this permission notice shall be included *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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****************************************************************************
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* @Id: curs_scroll.3x,v 1.15 2010/12/04 18:40:45 tom Exp @
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-->
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<HTML>
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<HEAD>
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<TITLE>curs_scroll 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>curs_scroll 3x</H1>
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<HR>
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<PRE>
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<!-- Manpage converted by man2html 3.0.1 -->
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<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG> <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
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</PRE>
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<H2>NAME</H2><PRE>
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<STRONG>scroll</STRONG>, <STRONG>scrl</STRONG>, <STRONG>wscrl</STRONG> - scroll a <STRONG>curses</STRONG> window
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</PRE>
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<H2>SYNOPSIS</H2><PRE>
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<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
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<STRONG>int</STRONG> <STRONG>scroll(WINDOW</STRONG> <STRONG>*win);</STRONG>
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<STRONG>int</STRONG> <STRONG>scrl(int</STRONG> <STRONG>n);</STRONG>
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<STRONG>int</STRONG> <STRONG>wscrl(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>n);</STRONG>
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</PRE>
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<H2>DESCRIPTION</H2><PRE>
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The <STRONG>scroll</STRONG> routine scrolls the window up one line. This
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involves moving the lines in the window data structure.
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As an optimization, if the scrolling region of the window
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is the entire screen, the physical screen may be scrolled
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at the same time.
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For positive <EM>n</EM>, the <STRONG>scrl</STRONG> and <STRONG>wscrl</STRONG> routines scroll the
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window up <EM>n</EM> lines (line <EM>i</EM>+<EM>n</EM> becomes <EM>i</EM>); otherwise scroll
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the window down <EM>n</EM> lines. This involves moving the lines
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in the window character image structure. The current cur-
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sor position is not changed.
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For these functions to work, scrolling must be enabled via
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<STRONG>scrollok</STRONG>.
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</PRE>
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<H2>RETURN VALUE</H2><PRE>
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These routines return <STRONG>ERR</STRONG> upon failure, and <STRONG>OK</STRONG> (SVr4 only
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specifies "an integer value other than <STRONG>ERR</STRONG>") upon success-
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ful completion.
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X/Open defines no error conditions.
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This implementation returns an error if the window pointer
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is null, or if scrolling is not enabled in the window,
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e.g., with <STRONG>scrollok</STRONG>.
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</PRE>
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<H2>NOTES</H2><PRE>
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Note that <STRONG>scrl</STRONG> and <STRONG>scroll</STRONG> may be macros.
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The SVr4 documentation says that the optimization of phys-
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ically scrolling immediately if the scroll region is the
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entire screen "is" performed, not "may be" performed.
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This implementation deliberately does not guarantee that
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this will occur, to leave open the possibility of smarter
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optimization of multiple scroll actions on the next up-
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date.
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Neither the SVr4 nor the XSI documentation specify whether
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the current attribute or current color-pair of blanks gen-
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erated by the scroll function is zeroed. Under this im-
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plementation it is.
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</PRE>
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<H2>PORTABILITY</H2><PRE>
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The XSI Curses standard, Issue 4 describes these func-
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tions.
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</PRE>
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<H2>SEE ALSO</H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
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<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>
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</PRE>
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<HR>
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<ADDRESS>
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Man(1) output converted with
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<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
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</ADDRESS>
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</BODY>
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</HTML>
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