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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.
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 window. 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 window.
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.
curs_touch (3X) |
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