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<H1 class="no-header">curs_refresh 3x</H1>
<PRE>
-<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG> <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
+<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
<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 <STRONG>curses</STRONG> windows and lines
</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</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 ter-
- minal, as other routines merely manipulate data struc-
- tures. The routine <STRONG>wrefresh</STRONG> copies the named window to
- the physical terminal screen, 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>leaveok</STRONG> has been enabled, the physical cursor of the ter-
- minal is left at the location of the cursor for that win-
- dow.
+ 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>leaveok</STRONG> has been enabled, the physi-
+ cal 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 up-
- dates with more efficiency than <STRONG>wrefresh</STRONG> alone. In addi-
- tion to all the window structures, <STRONG>curses</STRONG> keeps two data
- structures representing the terminal screen: a physical
- screen, describing what is actually on the screen, and a
- virtual screen, describing what the programmer wants to
- have on the screen.
-
- The routine <STRONG>wrefresh</STRONG> works by first calling <STRONG>wnoutrefresh</STRONG>,
- which copies the named window to the virtual screen, and
- then calling <STRONG>doupdate</STRONG>, which compares the virtual screen
- to the physical screen and does the actual update. If the
- programmer wishes to output several windows at once, a se-
- ries of calls to <STRONG>wrefresh</STRONG> results in alternating calls to
- <STRONG>wnoutrefresh</STRONG> and <STRONG>doupdate</STRONG>, causing several bursts of out-
- put to the screen. By first calling <STRONG>wnoutrefresh</STRONG> for each
- window, it is then possible to call <STRONG>doupdate</STRONG> once, result-
- ing in only one burst of output, with fewer total charac-
- ters transmitted and less CPU time used. If the <EM>win</EM> argu-
- ment to <STRONG>wrefresh</STRONG> is 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 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 overlap-
- ping windows; it means that if two windows overlap, you
- 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.)
+ 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
+ screen:
+
+ <STRONG>o</STRONG> a <EM>physical</EM> <EM>screen</EM>, describing what is actually on the screen, and
+
+ <STRONG>o</STRONG> a <EM>virtual</EM> <EM>screen</EM>, describing what the programmer wants to have on
+ the screen.
+
+ The routine <STRONG>wrefresh</STRONG> works by
+
+ <STRONG>o</STRONG> first calling <STRONG>wnoutrefresh</STRONG>, which copies the named window to the
+ <EM>virtual</EM> <EM>screen</EM>, and
+
+ <STRONG>o</STRONG> then calling <STRONG>doupdate</STRONG>, which compares the <EM>virtual</EM> <EM>screen</EM> to the
+ <EM>physical</EM> <EM>screen</EM> and does the actual update.
+
+ 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
+ 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.
+
+ 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
+ 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
+ <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 any-
- thing is written over them. It touches the indicated
- lines (marking them changed). The routine <STRONG>redrawwin</STRONG>()
- touches the entire window.
+ 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.
</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 completion.
+ 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.
- X/Open does not define any error conditions. In this im-
- plementation
+ 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 window is really a pad.
+ returns an error if the window pointer is null, or if the win-
+ dow is really a pad.
<STRONG>wredrawln</STRONG>
- returns an error if the associated call to <STRONG>touchln</STRONG>
- returns an error.
+ returns an error if the associated call to <STRONG>touchln</STRONG> returns an
+ error.
</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
- The XSI Curses standard, Issue 4 describes these func-
- tions.
+ The XSI Curses standard, Issue 4 describes these functions.
- Whether <STRONG>wnoutrefresh()</STRONG> copies to the virtual screen the
- entire contents of a window or just its changed portions
- has never been well-documented 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 ex-
- plicit <STRONG>touchwin()</STRONG> before the <STRONG>wnoutrefresh()</STRONG> call to guar-
- antee an entire-contents copy anywhere.
+ Whether <STRONG>wnoutrefresh</STRONG> copies to the virtual screen the entire contents
+ of a window or just its changed portions has never been well-documented
+ 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.
</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
- <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
+
<STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
</PRE>
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