'\" te
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.TH CLEAROK 3XCURSES "Jun 5, 2002"
.SH NAME
clearok, idlok, leaveok, scrollok, setscrreg, wsetscrreg \- terminal output
control functions
.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>

\fBint\fR \fBclearok\fR(\fBWINDOW *\fR\fIwin\fR, \fBbool\fR \fIbf\fR);
.fi

.LP
.nf
\fBint\fR \fBidlok\fR(\fBWINDOW *\fR\fIwin\fR, \fBbool\fR \fIbf\fR);
.fi

.LP
.nf
\fBint\fR \fBleaveok\fR(\fBWINDOW *\fR\fIwin\fR, \fBbool\fR \fIbf\fR);
.fi

.LP
.nf
\fBint\fR \fBscrollok\fR(\fBWINDOW *\fR\fIwin\fR, \fBbool\fR \fIbf\fR);
.fi

.LP
.nf
\fBint\fR \fBsetscrreg\fR(\fBint\fR \fItop\fR, \fBint\fR \fIbot\fR);
.fi

.LP
.nf
\fBint\fR \fBwsetscrreg\fR(\fBWINDOW *\fR\fIwin\fR, \fBint\fR \fItop\fR, \fBint\fR \fIbot\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions set options that deal with the output within Curses functions.
.sp
.LP
The \fBclearok()\fR function assigns the value of \fIbf\fR to an internal flag
in the specified window that governs clearing of the screen during a refresh.
If, during a refresh operation on the specified window, the flag in
\fIcurscr\fR is \fBTRUE\fR or the flag in the specified window is \fBTRUE\fR,
\fBclearok()\fR clears the screen, redraws it in its entirety, and sets the
flag to \fBFALSE\fR in \fIcurscr\fR and in the specified window. The initial
state is unspecified
.sp
.LP
The \fBidlok()\fR function specifies whether the implementation may use the
hardware insert-line, delete-line, and scroll features of terminals so
equipped. If \fIbf\fR is \fBTRUE\fR, use of these features is enabled. If
\fIbf\fR is \fBFALSE\fR, use of these features is disabled and lines are
instead redrawn as required. The initial state is \fBFALSE\fR.
.sp
.LP
The \fBleaveok()\fR function controls the cursor position after a refresh
operation. If \fIbf\fR is \fBTRUE\fR, refresh operations on the specified
window may leave the terminal's cursor at an arbitrary position. If \fIbf\fR is
\fBFALSE\fR, then at the end of any refresh operation, the terminal's cursor is
positioned at the cursor position contained in the specified window. The
initial state is \fBFALSE\fR.
.sp
.LP
The \fBscrollok()\fR function controls the use of scrolling.If \fIbf\fR is
\fBTRUE\fR, then scrolling is enabled for the specified window. If \fIbf\fR is
\fBFALSE\fR, scrolling is disabled for the specified window. The initial state
is \fBFALSE\fR.
.sp
.LP
The \fBsetscrreg()\fR and \fBwsetscrreg()\fR functions define a software
scrolling region in the current or specified window. The \fItop\fR and
\fIbottom\fR arguments are the line numbers of the first and last line defining
the scrolling region. (Line 0 is the top line of the window.) If this option
and \fBscrollok()\fR are enabled, an attempt to move off the last line of the
margin causes all lines in the scrolling region to scroll one line in the
direction of the first line. Only characters in the window are scrolled. If a
software scrolling region is set and \fBscrollok()\fR is not enabled, an
attempt to move off the last line of the margin does not reposition any lines
in the scrolling region.
.SH PARAMETERS
.sp
.ne 2
.na
\fB\fIwin\fR\fR
.ad
.RS 7n
Is a pointer to a window.
.RE

.sp
.ne 2
.na
\fB\fIbf\fR\fR
.ad
.RS 7n
Is a Boolean expression.
.RE

.sp
.ne 2
.na
\fB\fItop\fR\fR
.ad
.RS 7n
Is the top line of the scrolling region (top of the window is line 0).
.RE

.sp
.ne 2
.na
\fB\fIbot\fR\fR
.ad
.RS 7n
Is the bottom line of the scrolling region (top of the window is line 0).
.RE

.SH RETURN VALUES
.sp
.LP
Upon successful completion, the \fBsetscrreg()\fR and \fBwsetscrreg()\fR
functions return \fBOK\fR. Otherwise, they return \fBERR\fR.
.sp
.LP
The other functions always return \fBOK\fR.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH  USAGE
.sp
.LP
 The only reason to enable the \fBidlok()\fR feature is to use scrolling to
achieve the visual effect of motion of a partial window, such as for a screen
editor. In other cases, the feature can be visually annoying.
.sp
.LP
The \fBleaveok()\fR option provides greater efficiency for applications that do
not use the cursor.
.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 bkgdset (3XCURSES),
.BR clear (3XCURSES),
.BR doupdate (3XCURSES),
.BR libcurses (3XCURSES),
.BR scrl (3XCURSES),
.BR attributes (7),
.BR standards (7)