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163 lines
7.0 KiB
Plaintext
163 lines
7.0 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright (c) 1998-2004,2005 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_pad.3x,v 1.14 2005/05/15 16:18:43 tom Exp $
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.TH curs_pad 3X ""
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.na
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.hy 0
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.SH NAME
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\fBnewpad\fR,
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\fBsubpad\fR,
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\fBprefresh\fR,
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\fBpnoutrefresh\fR,
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\fBpechochar\fR,
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\fBpecho_wchar\fR - create and display \fBcurses\fR pads
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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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\fBWINDOW *newpad(int nlines, int ncols);\fR
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.br
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\fBWINDOW *subpad(WINDOW *orig, int nlines, int ncols,\fR
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\fBint begin_y, int begin_x);\fR
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.br
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\fBint prefresh(WINDOW *pad, int pminrow, int pmincol,\fR
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\fBint sminrow, int smincol, int smaxrow, int smaxcol);\fR
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.br
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\fBint pnoutrefresh(WINDOW *pad, int pminrow, int pmincol,\fR
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\fBint sminrow, int smincol, int smaxrow, int smaxcol);\fR
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.br
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\fBint pechochar(WINDOW *pad, chtype ch);\fR
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.br
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\fBint pecho_wchar(WINDOW *pad, const cchar_t *wch);\fR
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.SH DESCRIPTION
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The \fBnewpad\fR routine creates and returns a pointer to a new pad data
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structure with the given number of lines, \fInlines\fR, and columns,
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\fIncols\fR.
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A pad is like a window, except that it is not restricted by the
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screen size, and is not necessarily associated with a particular part of the
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screen.
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Pads can be used when a large window is needed, and only a part of the
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window will be on the screen at one time.
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Automatic refreshes of pads
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(e.g., from scrolling or echoing of input) do not occur.
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It is not
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legal to call \fBwrefresh\fR with a \fIpad\fR as an argument; the routines
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\fBprefresh\fR or \fBpnoutrefresh\fR should be called instead.
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Note that these
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routines require additional parameters to specify the part of the pad to be
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displayed and the location on the screen to be used for the display.
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.PP
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The \fBsubpad\fR routine creates and returns a pointer to a subwindow within a
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pad with the given number of lines, \fInlines\fR, and columns, \fIncols\fR.
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Unlike \fBsubwin\fR, which uses screen coordinates, the window is at position
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(\fIbegin\fR_\fIx\fR\fB,\fR \fIbegin\fR_\fIy\fR) on the pad.
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The window is
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made in the middle of the window \fIorig\fR, so that changes made to one window
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affect both windows.
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During the use of this routine, it will often be
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necessary to call \fBtouchwin\fR or \fBtouchline\fR on \fIorig\fR before
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calling \fBprefresh\fR.
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.PP
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The \fBprefresh\fR and \fBpnoutrefresh\fR routines are analogous to
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\fBwrefresh\fR and \fBwnoutrefresh\fR except that they relate to pads instead
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of windows.
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The additional parameters are needed to indicate what part of the
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pad and screen are involved.
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\fIpminrow\fR and \fIpmincol\fR specify the upper
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left-hand corner of the rectangle to be displayed in the pad.
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\fIsminrow\fR,
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\fIsmincol\fR, \fIsmaxrow\fR, and \fIsmaxcol\fR specify the edges of the
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rectangle to be displayed on the screen.
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The lower right-hand corner of the
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rectangle to be displayed in the pad is calculated from the screen coordinates,
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since the rectangles must be the same size.
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Both rectangles must be entirely
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contained within their respective structures.
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Negative values of
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\fIpminrow\fR, \fIpmincol\fR, \fIsminrow\fR, or \fIsmincol\fR are treated as if
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they were zero.
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.PP
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The \fBpechochar\fR routine is functionally equivalent to a call to \fBaddch\fR
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followed by a call to \fBrefresh\fR, a call to \fBwaddch\fR followed by a call
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to \fBwrefresh\fR, or a call to \fBwaddch\fR followed by a call to
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\fBprefresh\fR.
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The knowledge that only a single character is being output is
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taken into consideration and, for non-control characters, a considerable
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performance gain might be seen by using these routines instead of their
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equivalents.
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In the case of \fBpechochar\fR, the last location of the pad on
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the screen is reused for the arguments to \fBprefresh\fR.
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.PP
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The \fBpecho_wchar\fR function is the analogous wide-character
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form of \fBpechochar\fR.
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It outputs one character to a pad and immediately refreshes the pad.
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It does this by a call to \fBwadd_wch\fR followed by a call to \fBprefresh\fR.
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.SH RETURN VALUE
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Routines that return an integer return \fBERR\fR upon failure and \fBOK\fR
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(SVr4 only specifies "an integer value other than \fBERR\fR") upon successful
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completion.
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.PP
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Routines that return pointers return \fBNULL\fR on error, and set \fBerrno\fR
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to \fBENOMEM\fR.
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.PP
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X/Open does not define any error conditions.
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In this implementation
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.RS
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.TP 5
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\fBprefresh\fP and \fBpnoutrefresh\fP
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return an error
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if the window pointer is null, or
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if the window is not really a pad or
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if the area to refresh extends off-screen or
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if the minimum coordinates are greater than the maximum.
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.TP 5
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\fBpechochar\fP
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returns an error
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if the window is not really a pad, and the associated call
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to \fBwechochar\fP returns an error.
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.TP 5
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\fBpecho_wchar\fP
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returns an error
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if the window is not really a pad, and the associated call
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to \fBwecho_wchar\fP returns an error.
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.RE
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.SH NOTES
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Note that \fBpechochar\fR may be a macro.
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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_refresh\fR(3X), \fBcurs_touch\fR(3X), \fBcurs_addch\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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