CURSES_TOUCH(3)

NAME
curses_touch, touchline, touchoverlap, touchwin, untouchwin, wtouchln, is_linetouched, is_wintouched, redrawwin, wredrawln, syncok, wsyncup, wsyncdown - curses window modification routines

LIBRARY
libcurses

SYNOPSIS
#include <curses.h>
int
touchline(WINDOW *win, int start, int count);
int
touchoverlap(WINDOW *win1, WINDOW *win2);
int
touchwin(WINDOW *win);
int
untouchwin(WINDOW *win);
int
wtouchln(WINDOW *win, int line, int n, boolf changed);
bool
is_linetouched(WINDOW *win, int line);
bool
is_wintouched(WINDOW *win);
int
redrawwin(WINDOW *win);
int
wredrawln(WINDOW *win, int line, int n);
int
syncok(WINDOW *win);
void
wsyncup(WINDOW *win);
void
wsyncdown(WINDOW *win);

DESCRIPTION
These functions mark lines and windows as modified and check the modification status of lines and windows.

The touchline() function marks count lines starting from start in window win as having been modified. These characters will be synced to the terminal on the next call to wrefresh().

The touchoverlap() function marks the portion of win2 that overlaps win1 as being modified.

The touchwin() function marks the entire window win as having been modified. Conversely, the untouchwin() function marks the window win as being unmodified, so that any changes made to that window will not be synced to the terminal during a wrefresh().

The wtouchln() function performs one of two operations on n lines starting at line in the given window. If changed is 1 then the given line range is marked as being modified, if changed is 0 then the given line range is set to being unmodified.

The is_linetouched() function returns TRUE if line in window win has been modified since the last refresh was done, otherwise FALSE is returned.

is_wintouched() returns TRUE if the window win has been modified since the last refresh, otherwise FALSE is returned.

The redrawwin() function marks the entire window win as having been corrupted. Is is equivalent to the touchwin() function.

The wredrawln() function marks n lines starting at line in the given window as corrupted. It is equivalent to wtouchln(win, line, n, 1).

The syncok() function determines whether all the ancestors of the specified window are implicitly touched whenever there is a change in the window. The initial state is FALSE.

The wsyncup() function touches all ancestors of win.

The wsyncdown() function touches win if any of its ancestors is touched.

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_refresh(3)

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.