180 lines
4.6 KiB
Groff
180 lines
4.6 KiB
Groff
.\" $NetBSD: curses_refresh.3,v 1.13 2017/01/05 09:46:32 wiz Exp $
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.\"
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.\" Copyright (c) 2002
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.\" Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
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.\"
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.\" This code is donated to the NetBSD Foundation by the Author.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the Author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\"
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.Dd January 2, 2017
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.Dt CURSES_REFRESH 3
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.Os
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.Sh NAME
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.Nm curses_refresh ,
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.Nm refresh ,
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.Nm wrefresh ,
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.Nm wnoutrefresh ,
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.Nm doupdate ,
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.Nm immedok ,
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.Nm flushok ,
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.Nm leaveok ,
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.Nm is_leaveok
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.Nd curses terminal update routines
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.Sh LIBRARY
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.Lb libcurses
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.Sh SYNOPSIS
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.In curses.h
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.Ft int
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.Fn refresh "void"
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.Ft int
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.Fn wrefresh "WINDOW *win"
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.Ft int
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.Fn wnoutrefresh "WINDOW *win"
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.Ft int
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.Fn doupdate "void"
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.Ft int
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.Fn immedok "WINDOW *win" "boolf flag"
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.Ft int
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.Fn flushok "WINDOW *win" "boolf flag"
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.Ft int
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.Fn leaveok "WINDOW *win" "boolf flag"
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.Ft bool
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.Fn is_leaveok "const WINDOW *win"
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.Sh DESCRIPTION
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These functions update the terminal with the contents of
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.Dv stdscr
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or of the specified window(s).
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.Pp
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The
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.Fn refresh
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function causes curses to propagate changes made to
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.Dv stdscr
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to the terminal display.
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Any changes made to subwindows of
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.Dv stdscr
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are also propagated.
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.Pp
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The
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.Fn wrefresh
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function is the same as the
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.Fn refresh
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function, excepting that changes are propagated to the terminal from the
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window specified by
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.Fa win .
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.Pp
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The
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.Fn wnoutrefresh
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function performs the internal processing required by curses to determine
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what changes need to be made to synchronise the internal screen buffer
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and the terminal but does not modify the terminal display.
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.Pp
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The
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.Fn doupdate
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function updates the terminal display to match the internal curses
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representation of the display.
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.Pp
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The
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.Fn wnoutrefresh
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and
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.Fn doupdate
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functions can be used together to speed up terminal redraws by
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deferring the actual terminal updates until after a batch of updates
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to multiple windows has been done.
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.Pp
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The
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.Fn refresh
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function is equivalent to
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.Fn wnoutrefresh stdscr
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followed by
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.Fn doupdate .
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.Pp
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The
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.Fn immedok
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function determines whether the screen is refreshed whenever the window is
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changed.
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The initial state is
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.Dv FALSE .
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.Pp
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The
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.Fn flushok
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function is used to determine whether or not the screen's output file
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descriptor will be flushed on refresh.
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Setting
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.Fa flag
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to
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.Dv TRUE
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will cause the output to be flushed.
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.Pp
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The
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.Fn leaveok
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function determines whether refresh operations may leave the screen cursor
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in an arbitrary position on the screen.
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Setting
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.Fa flag
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to
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.Dv FALSE
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ensures that the screen cursor is positioned at the current cursor
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position after a refresh operation has taken place.
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The
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.Fn is_leaveok
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function returns the setting.
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.Sh RETURN VALUES
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Functions returning pointers will return
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.Dv NULL
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if an error is detected.
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The functions that return an int will return one of the following
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values:
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.Pp
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.Bl -tag -width ERR -compact
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.It Er OK
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The function completed successfully.
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.It Er ERR
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An error occurred in the function.
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.El
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.Sh SEE ALSO
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.Xr curses_pad 3 ,
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.Xr curses_touch 3 ,
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.Xr getch 3
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.Sh NOTES
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Calling
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.Fn wrefresh
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on a new, unchanged window has no effect.
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.Sh STANDARDS
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The
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.Nx
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Curses library complies with the X/Open Curses specification, part of the
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Single Unix Specification.
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.Sh HISTORY
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The Curses package appeared in
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.Bx 4.0 .
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The
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.Fn is_leaveok
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function is a
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.Em ncurses
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extension to the Curses library and was added in
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.Nx 8.0 .
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