Re: 'touchcell' functions?

[Thomas Dickey]

On Mon, Jun 26, 2023 at 02:11:28PM -0400, Bill Gray wrote:
> int touchline(WINDOW *win, int start, int count);
> bool is_linetouched(WINDOW *win, int line);
> 
>    enable one to 'touch' an (entire) line and to determine if (some or all
> of) a given line has been touched.  There are situations involving partially
> overlapping windows where one might want to 'touch' a range of cells within
> a line or determine if (some or all of) a range of cells within a line had
> been touched,  rather than touching or checking the entire line.
> 
>    I'm thinking along the lines of functions such as
> 
> int touchcells( WINDOW *win, int line, int column, int n_cols, int changed);
> bool is_celltouched( const WINDOW *win, int line, int column);
> 
>    and possibly
> 
> bool are_cellstouched( const WINDOW *win, int line, int column, int n_cols);
> 
>    Am I correct in thinking that these functions don't exist,  in ncurses or
> elsewhere?  (PDCurses and PDCursesMod provide some of this information,  but
> only by examining internal WINDOW struct data.)

correct - not in NetBSD curses, either (which inherits some little-used
functions from around 1990 in 4.4BSD).

It could be done in ncurses and other implementations using the first/last
character change on a given line, but I don't recall any expressed need
for this (ymmv).

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net

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