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<H1 class="no-header">curs_outopts 3x 2024-04-20 ncurses 6.5 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> Library calls <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> - set <EM>curses</EM> 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>scrollok(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>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
These routines set options that change the style of output within
<STRONG>curses</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
insertion and deletion. This option should be enabled only if the
application needs insert/delete line, for example, for a screen editor.
It is disabled by default because insert/delete line tends to be
visually annoying when used in applications where it is not really
needed. If insert/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
considers 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> as second argument, any change in the
window image, such as the ones caused by <STRONG>waddch,</STRONG> <STRONG>wclrtobot,</STRONG> <STRONG>wscrl</STRONG>,
etc., automatically causes a call to <STRONG>wrefresh</STRONG>. However, it may degrade
performance considerably, due to repeated calls to <STRONG>wrefresh</STRONG>. Calling
<STRONG>immedok</STRONG> with <STRONG>FALSE</STRONG> as second argument restores the default behavior,
i.e., deferring screen updates until a refresh is needed.
</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
applications where the cursor is not used, since it reduces the need
for cursor motions.
</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
character 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 terminal, it is also necessary to call <STRONG>idlok</STRONG>).
</PRE><H3><a name="h3-setscrreg_wsetscrreg">setscrreg, wsetscrreg</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>
parameters 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
option 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><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 specify any error conditions.
In this implementation,
<STRONG>o</STRONG> those functions that have a window pointer will return an error if
the window pointer is null
<STRONG>o</STRONG> <STRONG>wsetscrreg</STRONG> returns an error if the scrolling region limits extend
outside the window boundaries.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, and <STRONG>setscrreg</STRONG> may be
macros.
The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal
emulators.
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
These functions are described in X/Open Curses, Issue 4.
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>touchwin(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under <EM>ncurses</EM>.
Earlier System V curses implementations specified that with <STRONG>scrollok</STRONG>
enabled, any window modification triggering a scroll also forced a
physical refresh. X/Open Curses does not require this, and <EM>ncurses</EM>
avoids doing it to perform better vertical-motion optimization at
<STRONG>wrefresh</STRONG> time.
X/Open Curses 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 invisible.
</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE>
<EM>ncurses</EM> formerly treated <STRONG><A HREF="curs_inopts.3x.html">nl(3x)</A></STRONG> and <STRONG><A HREF="curs_inopts.3x.html">nonl(3x)</A></STRONG> as both input <EM>and</EM> output
options, but no longer; see <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>.
</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_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
ncurses 6.5 2024-04-20 <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-scrollok">scrollok</a></li>
<li><a href="#h3-setscrreg_wsetscrreg">setscrreg, wsetscrreg</a></li>
</ul>
</li>
<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
<li><a href="#h2-NOTES">NOTES</a></li>
<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
<li><a href="#h2-HISTORY">HISTORY</a></li>
<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
</ul>
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