Re: attroff and COLOR_PAIR

[Thomas Dickey]

On Tue, 26 Oct 2010, Dulek wrote:

> So what can I do about it? How to make a workaround?

It seems that you're asking how to store more than one color in a given
location (like a stack).  For that, you'll have to make some storage in
your program, and manage it.  Lynx does that, for instance, for its 
"color-style" displays.

> Thomas Dickey-2 wrote:
> > On Tue, 26 Oct 2010, Dulek wrote:
> >
> > > Look at this piece of code:
> > >
> > > attron(COLOR_PAIR(1));
> > > addstr("a");
> > > attron(COLOR_PAIR(2));
> > > addstr("b");
> > > attroff(COLOR_PAIR(2));
> > > addstr("c");
> > > attroff(COLOR_PAIR(1));
> > > refresh();
> > >
> > > According to  http://www.mkssoftware.com/docs/man3/curs_attr.3.asp manual
> > > :
> >
> > fwiw, the mks page is an old port of ncurses (from the late 1990's iirc).
> >
> > There's a current set of manpages on my website, e.g.,
> >
> > http://invisible-island.net/ncurses/man/curs_attr.3x.html
> >
> > > The routine attroff() turns off the named attributes without turning any
> > > other attributes on or off.
> > >
> > > This means, that this code should display 'a' in COLOR_PAIR(1) color, 'b'
> > > in
> > > COLOR_PAIR(2) color, and 'c' in COLOR_PAIR(1) color. Unfortunately 'c' is
> > > displayed in default terminal color. Why this is happening?
> >
> > As far as attron/attroff are concerned, the whole field masked by A_COLOR
> > is a single attribute.
> >
> > By the way, this is an extension from X/Open, because it accepts color as
> > one of the attributes (matching the SVr4 implementation).  X/Open only
> > defines attr_on/attr_off, which separates color from the other attributes
> > (because it's allowing for color pairs past the 6-8 bits used for
> > implementing A_COLOR).
> >
> > --
> > Thomas E. Dickey
> > http://invisible-island.net
> > ftp://invisible-island.net
> >
> > _______________________________________________
> > Bug-ncurses mailing list
> > address@hidden
> > http://lists.gnu.org/mailman/listinfo/bug-ncurses
>
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--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net