touchwin

curs_touch(3X)						       curs_touch(3X)



NAME
       touchwin,  touchline,  untouchwin,  wtouchln,  is_linetouched, is_win-
       touched - 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 infor-
       mation  about which parts of the window have been touched, by pretend-
       ing that the entire window has been drawn on.  This is sometimes	 nec-
       essary  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 routine
       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 spec-
       ified line/window was modified since the last call to wrefresh; other-
       wise 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.

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

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

NOTES
       Note that all routines except wtouchln may be macros.

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



							       curs_touch(3X)