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<H1 class="no-header">curs_outopts 3x</H1>
<PRE>
<STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
<STRONG>clearok</STRONG>, <STRONG>idlok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>immedok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>setscrreg</STRONG>, <STRONG>wsetscrreg</STRONG>,
<STRONG>scrollok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG> - <STRONG>curses</STRONG> output options
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
<STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
<STRONG>int</STRONG> <STRONG>clearok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>idlok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>void</STRONG> <STRONG>idcok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>void</STRONG> <STRONG>immedok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>leaveok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>setscrreg(int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>wsetscrreg(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>scrollok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
<STRONG>int</STRONG> <STRONG>nl(void);</STRONG>
<STRONG>int</STRONG> <STRONG>nonl(void);</STRONG>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
These routines set options that change the style of output within <STRONG>curs-</STRONG>
<STRONG>es</STRONG>. All options are initially <STRONG>FALSE</STRONG>, unless otherwise stated. It is
not necessary to turn these options off before calling <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG>.
</PRE><H3><a name="h3-clearok">clearok</a></H3><PRE>
If <STRONG>clearok</STRONG> is called with <STRONG>TRUE</STRONG> as argument, the next call to <STRONG>wrefresh</STRONG>
with this window will clear the screen completely and redraw the entire
screen from scratch. This is useful when the contents of the screen
are uncertain, or in some cases for a more pleasing visual effect. If
the <EM>win</EM> argument to <STRONG>clearok</STRONG> is the global variable <STRONG>curscr</STRONG>, the next
call to <STRONG>wrefresh</STRONG> with any window causes the screen to be cleared and
repainted from scratch.
</PRE><H3><a name="h3-idlok">idlok</a></H3><PRE>
If <STRONG>idlok</STRONG> is called with <STRONG>TRUE</STRONG> as second argument, <STRONG>curses</STRONG> considers using
the hardware insert/delete line feature of terminals so equipped.
Calling <STRONG>idlok</STRONG> with <STRONG>FALSE</STRONG> as second argument disables use of line inser-
tion and deletion. This option should be enabled only if the applica-
tion needs insert/delete line, for example, for a screen editor. It is
disabled by default because insert/delete line tends to be visually an-
noying when used in applications where it is not really needed. If in-
sert/delete line cannot be used, <STRONG>curses</STRONG> redraws the changed portions of
all lines.
</PRE><H3><a name="h3-idcok">idcok</a></H3><PRE>
If <STRONG>idcok</STRONG> is called with <STRONG>FALSE</STRONG> as second argument, <STRONG>curses</STRONG> no longer con-
siders using the hardware insert/delete character feature of terminals
so equipped. Use of character insert/delete is enabled by default.
Calling <STRONG>idcok</STRONG> with <STRONG>TRUE</STRONG> as second argument re-enables use of character
insertion and deletion.
</PRE><H3><a name="h3-immedok">immedok</a></H3><PRE>
If <STRONG>immedok</STRONG> is called with <STRONG>TRUE</STRONG> <STRONG>as</STRONG> <STRONG>argument</STRONG>, any change in the window
image, such as the ones caused by <STRONG>waddch,</STRONG> <STRONG>wclrtobot,</STRONG> <STRONG>wscrl</STRONG>, etc., auto-
matically cause a call to <STRONG>wrefresh</STRONG>. However, it may degrade perfor-
mance considerably, due to repeated calls to <STRONG>wrefresh</STRONG>. It is disabled
by default.
</PRE><H3><a name="h3-leaveok">leaveok</a></H3><PRE>
Normally, the hardware cursor is left at the location of the window
cursor being refreshed. The <STRONG>leaveok</STRONG> option allows the cursor to be
left wherever the update happens to leave it. It is useful for appli-
cations where the cursor is not used, since it reduces the need for
cursor motions.
</PRE><H3><a name="h3-setscrreg">setscrreg</a></H3><PRE>
The <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> routines allow the application programmer
to set a software scrolling region in a window. The <EM>top</EM> and <EM>bot</EM> param-
eters are the line numbers of the top and bottom margin of the
scrolling region. (Line 0 is the top line of the window.) If this op-
tion and <STRONG>scrollok</STRONG> are enabled, an attempt to move off the bottom margin
line causes all lines in the scrolling region to scroll one line in the
direction of the first line. Only the text of the window is scrolled.
(Note that this has nothing to do with the use of a physical scrolling
region capability in the terminal, like that in the VT100. If <STRONG>idlok</STRONG> is
enabled and the terminal has either a scrolling region or insert/delete
line capability, they will probably be used by the output routines.)
</PRE><H3><a name="h3-scrollok">scrollok</a></H3><PRE>
The <STRONG>scrollok</STRONG> option controls what happens when the cursor of a window
is moved off the edge of the window or scrolling region, either as a
result of a newline action on the bottom line, or typing the last char-
acter of the last line. If disabled, (<EM>bf</EM> is <STRONG>FALSE</STRONG>), the cursor is left
on the bottom line. If enabled, (<EM>bf</EM> is <STRONG>TRUE</STRONG>), the window is scrolled
up one line (Note that to get the physical scrolling effect on the ter-
minal, it is also necessary to call <STRONG>idlok</STRONG>).
</PRE><H3><a name="h3-nl_-nonl">nl, nonl</a></H3><PRE>
The <STRONG>nl</STRONG> and <STRONG>nonl</STRONG> routines control whether the underlying display device
translates the return key into newline on input, and whether it trans-
lates newline into return and line-feed on output (in either case, the
call <STRONG>addch('\n')</STRONG> does the equivalent of return and line feed on the
<EM>virtual</EM> <EM>screen</EM>). Initially, these translations do occur. If you dis-
able them using <STRONG>nonl</STRONG>, <STRONG>curses</STRONG> will be able to make better use of the
line-feed capability, resulting in faster cursor motion. Also, <STRONG>curses</STRONG>
will then be able to detect the return key.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
The functions <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> return <STRONG>OK</STRONG> upon success and <STRONG>ERR</STRONG>
upon failure. All other routines that return an integer always return
<STRONG>OK</STRONG>.
X/Open Curses does not define any error conditions.
In this implementation, those functions that have a window pointer will
return an error if the window pointer is null.
<STRONG>wclrtoeol</STRONG>
returns an error if the cursor position is about to wrap.
<STRONG>wsetscrreg</STRONG>
returns an error if the scrolling region limits extend out-
side the window.
X/Open does not define any error conditions. This implementation re-
turns an error if the window pointer is null.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These functions are described in the XSI Curses standard, Issue 4.
The XSI Curses standard is ambiguous on the question of whether <STRONG>raw</STRONG>
should disable the CRLF translations controlled by <STRONG>nl</STRONG> and <STRONG>nonl</STRONG>. BSD
curses did turn off these translations; AT&T curses (at least as late
as SVr1) did not. We choose to do so, on the theory that a programmer
requesting raw input wants a clean (ideally 8-bit clean) connection
that the operating system will not alter.
Some historic curses implementations had, as an undocumented feature,
the ability to do the equivalent of <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touch-</STRONG>
<STRONG>win(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under ncurses.
Earlier System V curses implementations specified that with <STRONG>scrollok</STRONG>
enabled, any window modification triggering a scroll also forced a
physical refresh. XSI Curses does not require this, and <STRONG>ncurses</STRONG> avoids
doing it to perform better vertical-motion optimization at <STRONG>wrefresh</STRONG>
time.
The XSI Curses standard does not mention that the cursor should be made
invisible as a side-effect of <STRONG>leaveok</STRONG>. SVr4 curses documentation does
this, but the code does not. Use <STRONG>curs_set</STRONG> to make the cursor invisi-
ble.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG> and <STRONG>setscrreg</STRONG> may
be macros.
The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal em-
ulators.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG>, <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>,
<STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.
<STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
<li><a href="#h2-NAME">NAME</a></li>
<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
<ul>
<li><a href="#h3-clearok">clearok</a></li>
<li><a href="#h3-idlok">idlok</a></li>
<li><a href="#h3-idcok">idcok</a></li>
<li><a href="#h3-immedok">immedok</a></li>
<li><a href="#h3-leaveok">leaveok</a></li>
<li><a href="#h3-setscrreg">setscrreg</a></li>
<li><a href="#h3-scrollok">scrollok</a></li>
<li><a href="#h3-nl_-nonl">nl, nonl</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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