Re: Multicolumn characters and Panels

[Sadrul Habib Chowdhury]

* Thomas Dickey had this to say on [18 Feb 2007, 11:08:40 -0500]:
> On Sat, Feb 17, 2007 at 05:24:21AM -0500, Sadrul H Chowdhury wrote:
> > Hi. I came across this bug when using gaim-text. It's kind of difficult to
> > explain. So I have included a sample test-program:
> 
> good...
>  

Hi. To work around this problem, I am using this function just before
I do update_panels: http://pidgin.im/~sadrul/pp/widechar-panel.patch. To
briefly explain, the function goes over all the panels, and if it covers
half of a multi-cell character from a panel below it, this function
replaces the visible half with a blank-space. One problem with this is
that if I move a panel which will expose the whole multi-cell character,
it doesn't always redraw properly.

Can there be a better workaround for this?

Thanks,
Sadrul

> > I tried to come up with a patch, and I got:
> > --- ncurses/base/lib_refresh.c
> > +++ ncurses/base/lib_refresh.c
> > @@ -150,7 +150,19 @@
> >            if (last > limit_x)
> >                last = limit_x;
> > 
> > -           for (j = oline->firstchar, n = j + begx; j <= last; j++, n++) {
> > +           j = oline->firstchar;
> > +           n = j + begx;
> > +           if (j <= last && n && isWidecExt(nline->text[n-1])) {
> > +               /* It's a multicolumn character. Replace with a space. */
> > +#if 0
> > +               NCURSES_CH_T blank = NewChar(BLANK_TEXT);
> > +               nline->text[n-1] = blank;
> > +#else
> > +               nline->text[n-1].chars[0] = ' ';
> > +#endif
> > +               CHANGED_CELL(nline, n-1);
> > +           }
> > +           for (; j <= last; j++, n++) {
> >                if (!CharEq(oline->text[j], nline->text[n])) {
> >                    nline->text[n] = oline->text[j];
> >                    CHANGED_CELL(nline, n);
> > 
> > It did seem to work (by replacing the wide-character by a space to make sure
> > it doesn't get displayed at all). However, if I bring up pone again (using
> > top_panel), the wide-character remains invisible. So I think this probably
> > is not the best fix. Is there any other fix I should try?
> 
> I'm not sure (will try to see).
> 
> thanks
> 
> -- 
> Thomas E. Dickey <address@hidden>
> http://invisible-island.net
> ftp://invisible-island.net