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