curs_touch(3)
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 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 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.
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 touchwin(stdscr) or clear(stdscr). This will not work under ncurses.
NOTES
Note that all routines except wtouchln may be macros.