97 lines
4.2 KiB
Plaintext
97 lines
4.2 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 1998-2005,2006 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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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: curs_scroll.3x,v 1.13 2006/02/25 21:49:19 tom Exp $
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.TH curs_scroll 3X ""
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.na
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.hy 0
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.SH NAME
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\fBscroll\fR,
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\fBscrl\fR,
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\fBwscrl\fR - scroll a \fBcurses\fR window
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.ad
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.hy
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.SH SYNOPSIS
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\fB#include <curses.h>\fR
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.sp
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\fBint scroll(WINDOW *win);\fR
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.br
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\fBint scrl(int n);\fR
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.br
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\fBint wscrl(WINDOW *win, int n);\fR
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.br
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.SH DESCRIPTION
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The \fBscroll\fR routine scrolls the window up one line.
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This involves moving
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the lines in the window data structure.
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As an optimization, if the scrolling
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region of the window is the entire screen, the physical screen may be scrolled
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at the same time.
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.PP
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For positive \fIn\fR, the \fBscrl\fR and \fBwscrl\fR routines scroll the
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window up \fIn\fR lines (line \fIi\fR+\fIn\fR becomes \fIi\fR); otherwise
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scroll the window down \fIn\fR lines.
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This involves moving the lines in the
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window character image structure.
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The current cursor position is not changed.
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.PP
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For these functions to work, scrolling must be enabled via \fBscrollok\fR.
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.SH RETURN VALUE
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These routines return \fBERR\fR upon failure, and \fBOK\fR (SVr4 only specifies
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"an integer value other than \fBERR\fR") upon successful completion.
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.PP
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X/Open defines no error conditions.
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.PP
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This implementation returns an error
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if the window pointer is null, or
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if scrolling is not enabled in the window, e.g., with \fBscrollok\fP.
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.SH NOTES
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Note that \fBscrl\fR and \fBscroll\fR may be macros.
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.PP
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The SVr4 documentation says that the optimization of physically scrolling
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immediately if the scroll region is the entire screen "is" performed, not
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"may be" performed.
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This implementation deliberately does not guarantee
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that this will occur, to leave open the possibility of smarter
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optimization of multiple scroll actions on the next update.
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.PP
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Neither the SVr4 nor the XSI documentation specify whether the current
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attribute or
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current color-pair of blanks generated by the scroll function is zeroed.
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Under this implementation it is.
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.SH PORTABILITY
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The XSI Curses standard, Issue 4 describes these functions.
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBcurs_outopts\fR(3X)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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