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CURSES_REFRESH(3)       NetBSD Library Functions Manual      CURSES_REFRESH(3)


NAME

     curses_refresh, refresh, wrefresh, wnoutrefresh, doupdate, immedok,
     flushok, leaveok, is_leaveok -- curses terminal update routines


LIBRARY

     Curses Library (libcurses, -lcurses)


SYNOPSIS

     #include <curses.h>

     int
     refresh(void);

     int
     wrefresh(WINDOW *win);

     int
     wnoutrefresh(WINDOW *win);

     int
     doupdate(void);

     int
     immedok(WINDOW *win, boolf flag);

     int
     flushok(WINDOW *win, boolf flag);

     int
     leaveok(WINDOW *win, boolf flag);

     bool
     is_leaveok(const WINDOW *win);


DESCRIPTION

     These functions update the terminal with the contents of stdscr or of the
     specified window(s).

     The refresh() function causes curses to propagate changes made to stdscr
     to the terminal display.  Any changes made to subwindows of stdscr are
     also propagated.

     The wrefresh() function is the same as the refresh() function, excepting
     that changes are propagated to the terminal from the window specified by
     win.

     The wnoutrefresh() function performs the internal processing required by
     curses to determine what changes need to be made to synchronise the
     internal screen buffer and the terminal but does not modify the terminal
     display.

     The doupdate() function updates the terminal display to match the inter-
     nal curses representation of the display.

     The wnoutrefresh() and doupdate() functions can be used together to speed
     up terminal redraws by deferring the actual terminal updates until after
     a batch of updates to multiple windows has been done.

     The refresh() function is equivalent to wnoutrefresh(stdscr) followed by
     doupdate().

     The immedok() function determines whether the screen is refreshed when-
     ever the window is changed.  The initial state is FALSE.

     The flushok() function is used to determine whether or not the screen's
     output file descriptor will be flushed on refresh.  Setting flag to TRUE
     will cause the output to be flushed.

     The leaveok() function determines whether refresh operations may leave
     the screen cursor in an arbitrary position on the screen.  Setting flag
     to FALSE ensures that the screen cursor is positioned at the current cur-
     sor position after a refresh operation has taken place.  The is_leaveok()
     function returns the setting.


RETURN VALUES

     Functions returning pointers will return NULL if an error is detected.
     The functions that return an int will return one of the following values:

     OK   The function completed successfully.
     ERR  An error occurred in the function.


SEE ALSO

     curses_pad(3), curses_touch(3), getch(3)


NOTES

     Calling wrefresh() on a new, unchanged window has no effect.


STANDARDS

     The NetBSD Curses library complies with the X/Open Curses specification,
     part of the Single Unix Specification.


HISTORY

     The Curses package appeared in 4.0BSD.  The is_leaveok() function is a
     ncurses extension to the Curses library and was added in NetBSD 8.0.

NetBSD 10.1                     January 2, 2017                    NetBSD 10.1