157 lines
4.4 KiB
Groff
157 lines
4.4 KiB
Groff
.\" $NetBSD: curses_pad.3,v 1.6 2017/01/05 23:15:43 roy Exp $
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Julian Coleman.
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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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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd January 5, 2016
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.Dt CURSES_PAD 3
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.Os
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.Sh NAME
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.Nm curses_pad ,
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.Nm newpad ,
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.Nm subpad ,
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.Nm prefresh ,
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.Nm pnoutrefresh
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.Nd curses pad 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 WINDOW *
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.Fn newpad "int lines" "int cols"
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.Ft WINDOW *
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.Fn subpad "WINDOW *pad" "int lines" "int cols" "int begin_y" "int begin_x"
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.Ft int
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.Fn prefresh "WINDOW *pad" "int pbeg_y" "int pbeg_x" "int sbeg_y" "int sbeg_x" "int smax_y" "int smax_x"
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.Ft int
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.Fn pnoutrefresh "WINDOW *pad" "int pbeg_y" "int pbeg_x" "int sbeg_y" "int sbeg_x" "int smax_y" "int smax_x"
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.Ft bool
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.Fn is_pad "const WINDOW *pad"
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.Sh DESCRIPTION
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These functions create and display pads on the current screen.
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.Pp
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The
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.Fn newpad
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function creates a new pad of size
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.Fa lines ,
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.Fa cols .
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.Pp
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.Fn subpad
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is similar to
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.Fn newpad
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excepting that the size of the subpad is bounded by the parent
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pad
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.Fa pad .
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The subpad shares internal data structures with the parent pad
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and will be refreshed when the parent pad is refreshed.
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The starting column and row
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.Fa begin_y ,
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.Fa begin_x
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are relative to the parent pad origin.
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.Pp
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The
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.Fn pnoutrefresh
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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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A rectangular area of the pad starting at column and row
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.Fa pbeg_y ,
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.Fa pbeg_x
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is copied to the corresponding rectangular area of the screen buffer starting
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at column and row
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.Fa sbeg_y ,
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.Fa sbeg_x
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and extending to
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.Fa smax_y ,
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.Fa smax_x .
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.Pp
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The
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.Fn prefresh
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function causes curses to propagate changes made to the pad specified by
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.Fa pad
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to the terminal display.
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A rectangular area of the pad starting at column and row
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.Fa pbeg_y ,
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.Fa pbeg_x
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is copied to the corresponding rectangular area of the terminal starting
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at column and row
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.Fa sbeg_y ,
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.Fa sbeg_x
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and extending to
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.Fa smax_y ,
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.Fa smax_x .
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.Pp
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The
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.Fn pnoutrefresh
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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 pads has been done.
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.Pp
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The
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.Fn is_pad
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function returns true if the given window was created by
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.Fn newpad ,
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otherwise false.
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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_refresh 3 ,
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.Xr curses_window 3
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.Sh NOTES
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The
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.Fn subpad
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function is similar to the
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.Xr derwin 3
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function, and not the
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.Xr subwin 3
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function.
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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_pad
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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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