* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************
- * @Id: curs_refresh.3x,v 1.31 2023/08/19 19:47:40 tom Exp @
+ * @Id: curs_refresh.3x,v 1.35 2023/09/16 23:37:03 tom Exp @
-->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML>
<HEAD>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<meta name="generator" content="Manpage converted by man2html - see https://invisible-island.net/scripts/readme.html#others_scripts">
-<TITLE>curs_refresh 3x 2023-08-19 ncurses 6.4 Library calls</TITLE>
+<TITLE>curs_refresh 3x 2023-09-16 ncurses 6.4 Library calls</TITLE>
<link rel="author" href="mailto:bug-ncurses@gnu.org">
</HEAD>
<BODY>
-<H1 class="no-header">curs_refresh 3x 2023-08-19 ncurses 6.4 Library calls</H1>
+<H1 class="no-header">curs_refresh 3x 2023-09-16 ncurses 6.4 Library calls</H1>
<PRE>
<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
- <STRONG>doupdate</STRONG>, <STRONG>redrawwin</STRONG>, <STRONG>refresh</STRONG>, <STRONG>wnoutrefresh</STRONG>, <STRONG>wredrawln</STRONG>, <STRONG>wrefresh</STRONG> -
- refresh <STRONG>curses</STRONG> windows and lines
+ <STRONG>doupdate</STRONG>, <STRONG>redrawwin</STRONG>, <STRONG>refresh</STRONG>, <STRONG>wnoutrefresh</STRONG>, <STRONG>wredrawln</STRONG>, <STRONG>wrefresh</STRONG> -
+ refresh <EM>curses</EM> windows or lines thereupon
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
</PRE><H3><a name="h3-refresh_wrefresh">refresh/wrefresh</a></H3><PRE>
The <STRONG>refresh</STRONG> and <STRONG>wrefresh</STRONG> routines (or <STRONG>wnoutrefresh</STRONG> and <STRONG>doupdate</STRONG>) must
- be called to get actual output to the terminal, as other routines mere-
- ly manipulate data structures. The routine <STRONG>wrefresh</STRONG> copies the named
- window to the <EM>physical</EM> <EM>screen</EM>, taking into account what is already
- there to do optimizations. The <STRONG>refresh</STRONG> routine is the same, using <STRONG>std-</STRONG>
- <STRONG>scr</STRONG> as the default window. Unless <STRONG><A HREF="leaveok.3x.html">leaveok(3x)</A></STRONG> has been enabled, the
- physical cursor of the terminal is left at the location of the cursor
- for that window.
+ be called to get actual output to the terminal, as other routines
+ merely manipulate data structures. The routine <STRONG>wrefresh</STRONG> copies the
+ named window to the <EM>physical</EM> <EM>screen</EM>, taking into account what is
+ already there to do optimizations. The <STRONG>refresh</STRONG> routine is the same,
+ using <STRONG>stdscr</STRONG> as the default window. Unless <STRONG><A HREF="leaveok.3x.html">leaveok(3x)</A></STRONG> has been
+ enabled, the physical cursor of the terminal is left at the location of
+ the cursor for that window.
</PRE><H3><a name="h3-wnoutrefresh_doupdate">wnoutrefresh/doupdate</a></H3><PRE>
The <STRONG>wnoutrefresh</STRONG> and <STRONG>doupdate</STRONG> routines allow multiple updates with more
- efficiency than <STRONG>wrefresh</STRONG> alone. In addition to all the window struc-
- tures, <STRONG>curses</STRONG> keeps two data structures representing the terminal
+ efficiency than <STRONG>wrefresh</STRONG> alone. In addition to all the window
+ structures, <STRONG>curses</STRONG> keeps two data structures representing the terminal
screen:
<STRONG>o</STRONG> a <EM>physical</EM> <EM>screen</EM>, describing what is actually on the screen, and
If the programmer wishes to output several windows at once, a series of
calls to <STRONG>wrefresh</STRONG> results in alternating calls to <STRONG>wnoutrefresh</STRONG> and
<STRONG>doupdate</STRONG>, causing several bursts of output to the screen. By first
- calling <STRONG>wnoutrefresh</STRONG> for each window, it is then possible to call <STRONG>doup-</STRONG>
- <STRONG>date</STRONG> once, resulting in only one burst of output, with fewer total
+ calling <STRONG>wnoutrefresh</STRONG> for each window, it is then possible to call
+ <STRONG>doupdate</STRONG> once, resulting in only one burst of output, with fewer total
characters transmitted and less CPU time used.
- If the <EM>win</EM> argument to <STRONG>wrefresh</STRONG> is the <EM>physical</EM> <EM>screen</EM> (i.e., the glob-
- al variable <STRONG>curscr</STRONG>), the screen is immediately cleared and repainted
- from scratch.
+ If the <EM>win</EM> argument to <STRONG>wrefresh</STRONG> is the <EM>physical</EM> <EM>screen</EM> (i.e., the
+ global variable <STRONG>curscr</STRONG>), the screen is immediately cleared and
+ repainted from scratch.
- The phrase "copies the named window to the virtual screen" above is am-
- biguous. What actually happens is that all <EM>touched</EM> (changed) lines in
- the window are copied to the virtual screen. This affects programs
+ The phrase "copies the named window to the virtual screen" above is
+ ambiguous. What actually happens is that all <EM>touched</EM> (changed) lines
+ in the window are copied to the virtual screen. This affects programs
that use overlapping windows; it means that if two windows overlap, you
- can refresh them in either order and the overlap region will be modi-
- fied only when it is explicitly changed. (But see the section on
+ can refresh them in either order and the overlap region will be
+ modified only when it is explicitly changed. (But see the section on
<STRONG>PORTABILITY</STRONG> below for a warning about exploiting this behavior.)
</PRE><H3><a name="h3-wredrawln_redrawwin">wredrawln/redrawwin</a></H3><PRE>
The <STRONG>wredrawln</STRONG> routine indicates to <STRONG>curses</STRONG> that some screen lines are
corrupted and should be thrown away before anything is written over
- them. It touches the indicated lines (marking them changed). The rou-
- tine <STRONG>redrawwin</STRONG> touches the entire window.
+ them. It touches the indicated lines (marking them changed). The
+ routine <STRONG>redrawwin</STRONG> touches the entire window.
</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
Routines that return an integer return <STRONG>ERR</STRONG> upon failure, and <STRONG>OK</STRONG> (SVr4
- only specifies "an integer value other than <STRONG>ERR</STRONG>") upon successful com-
- pletion.
+ only specifies "an integer value other than <STRONG>ERR</STRONG>") upon successful
+ completion.
X/Open does not define any error conditions. In this implementation
<STRONG>wnoutrefresh</STRONG>
- returns an error if the window pointer is null, or if the win-
- dow is really a pad.
+ returns an error if the window pointer is null, or if the
+ window is really a pad.
<STRONG>wredrawln</STRONG>
returns an error if the associated call to <STRONG>touchln</STRONG> returns an
in historic curses versions (including SVr4). It might be unwise to
rely on either behavior in programs that might have to be linked with
other curses implementations. Instead, you can do an explicit <STRONG>touchwin</STRONG>
- before the <STRONG>wnoutrefresh</STRONG> call to guarantee an entire-contents copy any-
- where.
+ before the <STRONG>wnoutrefresh</STRONG> call to guarantee an entire-contents copy
+ anywhere.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
-ncurses 6.4 2023-0
8-19 <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
+ncurses 6.4 2023-0
9-16 <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
</PRE>
<div class="nav">
<ul>
projects / ncurses.git / blobdiff