mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-22 00:42:06 +01:00
70 lines
3.1 KiB
Groff
70 lines
3.1 KiB
Groff
|
.TH curs_refresh 3X ""
|
||
|
|
.SH NAME
|
||
|
|
\fBcurs_refresh\fR: \fBrefresh\fR, \fBwrefresh\fR, \fBwnoutrefresh\fR,
|
||
|
|
\fBdoupdate\fR, \fBredrawwin\fR, \fBwredrawln\fR - refresh
|
||
|
|
\fBncurses\fR windows and lines
|
||
|
|
.SH SYNOPSIS
|
||
|
|
\fB#include <ncurses.h>\fR
|
||
|
|
|
||
|
|
\fBint refresh(void);\fR
|
||
|
|
.br
|
||
|
|
\fBint wrefresh(WINDOW *win);\fR
|
||
|
|
.br
|
||
|
|
\fBint wnoutrefresh(WINDOW *win);\fR
|
||
|
|
.br
|
||
|
|
\fBint doupdate(void);\fR
|
||
|
|
.br
|
||
|
|
\fBint redrawwin(WINDOW *win);\fR
|
||
|
|
.br
|
||
|
|
\fBint wredrawln(WINDOW *win, int beg_line, int num_lines);\fR
|
||
|
|
.br
|
||
|
|
.SH DESCRIPTION
|
||
|
|
The \fBrefresh\fR and \fBwrefresh\fR routines (or \fBwnoutrefresh\fR and
|
||
|
|
\fBdoupdate\fR) must be called to get actual output to the terminal, as other
|
||
|
|
routines merely manipulate data structures. The routine \fBwrefresh\fR copies
|
||
|
|
the named window to the physical terminal screen, taking into account what is
|
||
|
|
already there in order to do optimizations. The \fBrefresh\fR routine is the
|
||
|
|
same, using \fBstdscr\fR as the default window. Unless \fBleaveok\fR has been
|
||
|
|
enabled, the physical cursor of the terminal is left at the location of the
|
||
|
|
cursor for that window.
|
||
|
|
|
||
|
|
The \fBwnoutrefresh\fR and \fBdoupdate\fR routines allow multiple updates with
|
||
|
|
more efficiency than \fBwrefresh\fR alone. In addition to all the window
|
||
|
|
structures, \fBncurses\fR 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 \fBwrefresh\fR works by first calling \fBwnoutrefresh\fR, which
|
||
|
|
copies the named window to the virtual screen, and then calling \fBdoupdate\fR,
|
||
|
|
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 series
|
||
|
|
of calls to \fBwrefresh\fR results in alternating calls to \fBwnoutrefresh\fR
|
||
|
|
and \fBdoupdate\fR, causing several bursts of output to the screen. By first
|
||
|
|
calling \fBwnoutrefresh\fR for each window, it is then possible to call
|
||
|
|
\fBdoupdate\fR once, resulting in only one burst of output, with fewer total
|
||
|
|
characters transmitted and less CPU time used. If the \fIwin\fR argument to
|
||
|
|
\fBwrefresh\fR is the global variable \fBcurscr\fR, the screen is immediately
|
||
|
|
cleared and repainted from scratch.
|
||
|
|
|
||
|
|
The \fBredrawwin\fR routine indicates to \fBncurses\fR that some screen lines
|
||
|
|
are corrupted and should be thrown away before anything is written over them.
|
||
|
|
These routines could be used for programs such as editors, which want a command
|
||
|
|
to redraw some part of the screen or the entire screen. The routine
|
||
|
|
\fBredrawln\fR is preferred over \fBredrawwin\fR where a noisy communication
|
||
|
|
line exists and redrawing the entire window could be subject to even more
|
||
|
|
communication noise. Just redrawing several lines offers the possibility that
|
||
|
|
they would show up unblemished.
|
||
|
|
.SH RETURN VALUE
|
||
|
|
All routines return the integer \fBERR\fR upon failure and an integer value
|
||
|
|
other than \fBERR\fR upon successful completion.
|
||
|
|
.SH NOTES
|
||
|
|
Note that \fBrefresh\fR and \fBredrawwin\fR may be macros.
|
||
|
|
.SH SEE ALSO
|
||
|
|
\fBncurses\fR(3X), \fBcurs_outopts\fR(3X)
|
||
|
|
.\"#
|
||
|
|
.\"# The following sets edit modes for GNU EMACS
|
||
|
|
.\"# Local Variables:
|
||
|
|
.\"# mode:nroff
|
||
|
|
.\"# fill-column:79
|
||
|
|
.\"# End:
|