Re: read mouse position beyond column 256 ?

[Patrick]

Hi

I am just digging up an old thread I started this past February.

I am badly overloaded and I don't want to make promises I can't keep but 
I was just wondering....

I was thinking that if it was not too hard I could to modify ncurses to 
read beyond row-col 223. Is this code in lib_mouse ? I don't understand 
the code but it's just over 1500 lines, so it's in the range of 
possibility for me. Is the ncurses codebase very intertwined or is it 
fairly easy to understand files like this without understanding the 
whole codebase?

Would this pretty much be a case of changing a short to an int and than 
compensating for the change elsewhere ?

-Patrick





On 14-02-20 09:37 AM, Egmont Koblinger wrote:
> Hi Patrick,
>
> I guess with most terminals the limit is the 223rd row-column.  (It
> might be 255 with certain terminals, I'm not sure.)  This is due to
> the limitations of the legacy mouse protocol used by the terminals
> (row and column encoded in single bytes).
>
> The recent SGR 1006 mouse extension allows arbitrary coordinates to be
> reported.  Most terminal emulators already support it, and so do quite
> a few applications (vim, emacs, tmux, mc, links, ...).  They handle
> mouse their own way, rather than via getmouse().  Unfortunately, the
> ncurses library doesn't support this extension yet.
>
> I've already asked Thomas to implement it, it must be somewhere on his
> TODO list.  When enabling mouse with ncurses, it should also
> automatically transparently enable the extension.  Terminals that
> don't support it will silently ignore this request and keep reporting
> the coordinates using the old method.  Terminals that do support it
> will report coordinates using the new method.  The old and new methods
> are perfectly distinguishable, so it'll work no matter if the terminal
> supports the extension or not.  (Of course, if it doesn't support it,
> you'll get coordinates up to 223 only.)  This change would be totally
> transparent towards ncurses applications (no API/ABI change), and
> would automatically fix mouse handling in all applications that use
> getmouse() (like htop, lynx, and probably many more).
>
>
> egmont
>
> On Thu, Feb 20, 2014 at 3:22 PM, Patrick <address@hidden> wrote:
> > Hi Everyone
> >
> > I am trying to read the co-ordinates of a graphics tablet. I could read the
> > X Y position with a GUi toolkit but I would strongly prefer ncurses.
> >
> > I can't seem to read past 250 something or so. I am guessing that the
> > locations may be stored as short types
> >
> > At the end of the email is a sample program from Gookin's Programmers Guide
> > To Ncurses.
> >
> > I changed the #include to link to ncursesw in the hopes that it would
> > support columns beyond 256 but it does not seem to.
> >
> > I compiled it with this:
> >
> > gcc mevent.c -o debug `ncursesw5-config --cflags --libs`
> >
> > If anyone could lend a hand I would really appreciate it-Patrick
> >
> >
> >
> > #include <ncursesw/ncurses.h>
> >
> > int main(void)
> > {
> >      MEVENT mwhat;
> >      int ch;
> >
> >      initscr();
> >      noecho();
> >      keypad(stdscr,TRUE);
> >
> >      mousemask(ALL_MOUSE_EVENTS,NULL);
> >
> >      while(1)
> >      {
> >          ch = getch();
> >          if( ch == KEY_MOUSE )
> >          {
> >              getmouse(&mwhat);
> >              move(0,0);
> >              clrtoeol();
> >              printw("%2d %2d",mwhat.y,mwhat.x);
> >              refresh();
> >              continue;
> >          }
> >          if( ch == '\n' )
> >              break;
> >      }
> >
> >      endwin();
> >
> >
> >      return 0;
> > }
> >
> > _______________________________________________
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