* sale, use or other dealings in this Software without prior written *
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- * @Id: curs_outopts.3x,v 1.46 2023/09/30 21:38:11 tom Exp @
+ * @Id: curs_outopts.3x,v 1.48 2023/10/07 22:54:10 tom Exp @
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-<H1 class="no-header">curs_outopts 3x 2023-09-30 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_outopts 3x 2023-10-07 ncurses 6.4 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><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.,
- automatically cause a call to <STRONG>wrefresh</STRONG>. However, it may degrade
- performance considerably, due to repeated calls to <STRONG>wrefresh</STRONG>. It is
- disabled by default.
+ 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
+ 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
+ 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
+ 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
+ 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
+ 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
+ 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,
- <STRONG>o</STRONG> those functions that have a window pointer will return an error if
+ <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
+ <STRONG>o</STRONG> <STRONG>wsetscrreg</STRONG> returns an error if the scrolling region limits extend
outside the window.
- X/Open does not define any error conditions. This implementation
+ X/Open does not define any error conditions. This implementation
returns 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.
- From the outset, ncurses used <STRONG>nl</STRONG>/<STRONG>nonl</STRONG> to control the conversion of
- newlines to carriage return/line-feed on output as well as input. XSI
- Curses documents only the use of these functions for input. This
- difference arose from converting the <EM>pcurses</EM> source (which used <STRONG>ioctl</STRONG>
- calls with the <STRONG>sgttyb</STRONG> structure) to termios (i.e., the POSIX terminal
+ From the outset, ncurses used <STRONG>nl</STRONG>/<STRONG>nonl</STRONG> to control the conversion of
+ newlines to carriage return/line-feed on output as well as input. XSI
+ Curses documents only the use of these functions for input. This
+ difference arose from converting the <EM>pcurses</EM> source (which used <STRONG>ioctl</STRONG>
+ calls with the <STRONG>sgttyb</STRONG> structure) to termios (i.e., the POSIX terminal
interface). In the former, both input and output were controlled via a
single option <STRONG>CRMOD</STRONG>, while the latter separates these features.
- Because that conversion interferes with output optimization, <STRONG>nl</STRONG>/<STRONG>nonl</STRONG>
+ Because that conversion interferes with output optimization, <STRONG>nl</STRONG>/<STRONG>nonl</STRONG>
were amended after ncurses 6.2 to eliminate their effect on output.
- Some historic curses implementations had, as an undocumented feature,
+ 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 ncurses.
- Earlier System V curses implementations specified that with <STRONG>scrollok</STRONG>
- enabled, any window modification triggering a scroll also forced a
+ 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>
+ 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
+ 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-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
+ 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
+ The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal
emulators.
</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="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>
-ncurses 6.4 2023-
09-30 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
+ncurses 6.4 2023-
10-07 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
</PRE>
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