'\" te
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.TH DERWIN 3XCURSES "Jun 5, 2002"
.SH NAME
derwin, newwin, subwin \- create a new window or subwindow
.SH SYNOPSIS
.LP
.nf
\fBcc\fR [ \fIflag\fR... ] \fIfile\fR... \fB-I\fR /usr/xpg4/include \fB -L \fR /usr/xpg4/lib \e
\fB -R \fR /usr/xpg4/lib \fB -lcurses \fR [ \fIlibrary\fR... ]

\fBc89\fR [ \fIflag\fR... ] \fIfile\fR... \fB-lcurses\fR [ \fIlibrary\fR... ]

#include <curses.h>

\fBWINDOW *\fR\fBderwin\fR(\fBWINDOW *\fR\fIorig\fR, \fBint\fR \fInlines\fR, \fBint\fR \fIncols\fR,
     \fBint\fR \fIbegin_y\fR, \fBint\fR \fIbegin_x\fR);
.fi

.LP
.nf
\fBWINDOW *\fR\fBnewwin\fR(\fBint\fR \fInlines\fR, \fBint\fR \fIncols\fR, \fBint\fR \fIbegin_y\fR, \fBint\fR \fIbegin_x\fR);
.fi

.LP
.nf
\fBWINDOW *\fR\fBsubwin\fR(\fBWINDOW *\fR\fIorig\fR, \fBint\fR \fInlines\fR, \fBint\fR \fIncols\fR, \fBint\fR \fIbegin_y\fR,
     \fBint\fR \fIbegin_x\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBderwin()\fR function creates a subwindow within window \fIorig\fR,  with
the specified number of lines and columns, and upper left corner  positioned at
\fIbegin_x\fR, \fIbegin_y\fR relative to window \fIorig\fR.  A pointer to the
new window structure is returned.
.sp
.LP
The \fBnewwin()\fR function creates a new window with the specified number of
lines and columns and upper left corner positioned at \fIbegin_x\fR,
\fIbegin_y\fR.  A pointer to the new window structure is returned.  A
full-screen window can be created by calling \fBnewwin(0,0,0,0)\fR.
.sp
.LP
If the number of lines specified is zero, \fBnewwin()\fR uses a default value
of \fBLINES\fR minus \fIbegin_y\fR; if the number of columns specified is
zero, \fBnewwin()\fR uses the default value of \fBCOLS\fR minus \fIbegin_x\fR.
.sp
.LP
The \fBsubwin()\fR function creates a subwindow within window \fIorig\fR, with
the specified number of lines and columns, and upper left corner positioned at
\fIbegin_x\fR, \fIbegin_y\fR (relative to the physical screen, \fInot\fR to
window \fIorig\fR). A pointer to the new window structure is returned.
.sp
.LP
The original window and subwindow share character storage of the overlapping
area (each window maintains its own pointers, cursor location, and other
items). This means that characters and attributes are identical in overlapping
areas regardless of which window characters are written to.
.sp
.LP
When using subwindows, it is often necessary to call \fBtouchwin\fR(3XCURSES)
before \fBwrefresh\fR(3XCURSES) to maintain proper screen contents.
.SH PARAMETERS
.sp
.ne 2
.na
\fB\fIorig\fR\fR
.ad
.RS 11n
Is a pointer to the parent window for the newly created subwindow.
.RE

.sp
.ne 2
.na
\fB\fInlines\fR\fR
.ad
.RS 11n
Is the number of lines in the subwindow.
.RE

.sp
.ne 2
.na
\fB\fIncols\fR\fR
.ad
.RS 11n
Is the number of columns in the subwindow.
.RE

.sp
.ne 2
.na
\fB\fIbegin_y\fR\fR
.ad
.RS 11n
Is the y (row) coordinate of the upper left corner of the subwindow, relative
to the parent window.
.RE

.sp
.ne 2
.na
\fB\fIbegin_x\fR\fR
.ad
.RS 11n
Is the x (column) coordinate of the upper left corner of the subwindow,
relative to the parent window.
.RE

.SH RETURN VALUES
.sp
.LP
On success, these functions return a pointer to the newly-created window.
Otherwise, they return \fBERR\fR.
.SH ERRORS
.sp
.LP
None.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	Unsafe
.TE

.SH SEE ALSO
.sp
.LP
.BR doupdate (3XCURSES),
.BR is_linetouched (3XCURSES),
.BR libcurses (3XCURSES),
.BR attributes (7),
.BR standards (7)