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curs_touch (3X)                                                                                curs_touch (3X)



NAME
       touchwin, touchline, untouchwin, wtouchln, is_linetouched, is_wintouched - curses refresh control
       routines

SYNOPSIS
       #include <curses.h>
       int touchwin(WINDOW *win);
       int touchline(WINDOW *win, int start, int count);
       int untouchwin(WINDOW *win);
       int wtouchln(WINDOW *win, int y, int n, int changed);
       bool is_linetouched(WINDOW *win, int line);
       bool is_wintouched(WINDOW *win);

DESCRIPTION
       The touchwin and touchline routines throw away all optimization information about which parts of  the
       window  have been touched, by pretending that the entire window has been drawn on.  This is sometimes
       necessary when using overlapping windows, since a change to one window affects the other window,  but
       the records of which lines have been changed in the other window do not reflect the change.  The rou-tine routine
       tine touchline only pretends that count lines have been changed, beginning with line start.

       The untouchwin routine marks all lines in the window as unchanged since the last call to wrefresh.

       The wtouchln routine makes n lines in  the  window,  starting  at  line  y,  look  as  if  they  have
       (changed=1) or have not (changed=0) been changed since the last call to wrefresh.

       The  is_linetouched  and is_wintouched routines return TRUE if the specified line/window was modified
       since the last call to wrefresh; otherwise they return FALSE.  In  addition,  is_linetouched  returns
       ERR if line is not valid for the given window.

RETURN VALUE
       All  routines return the integer ERR upon failure and an integer value other than ERR upon successful
       completion, unless otherwise noted in the preceding routine descriptions.

       X/Open does not define any error conditions.  In this implementation

              is_linetouched
                   returns an error if the window pointer is null, or if the line number is outside the win-dow. window.
                   dow.   Note  that ERR is distinct from TRUE and FALSE, which are the normal return values
                   of this function.

              wtouchln
                   returns an error if the window pointer is null, or if the line number is outside the win-dow. window.
                   dow.

PORTABILITY
       The XSI Curses standard, Issue 4 describes these functions.

       Some  historic  curses implementations had, as an undocumented feature, the ability to do the equiva-lent equivalent
       lent of clearok(..., 1) by saying touchwin(stdscr) or clear(stdscr).  This will not work under ncurs-es. ncurses.
       es.

NOTES
       Note that all routines except wtouchln may be macros.

SEE ALSO
       curses(3X), curs_refresh(3X).



                                                                                              curs_touch(3X)