Re: canvas stuff

[Bill Haneman <Bill Haneman Sun COM>]

Hi Gustavo:

Your suggestion of a 'retained mode' (i.e. has a memory) canvas widget
on top of Cairo makes sense to me.  As for gnome-canvas, I recognize
that it's problematic,  but as you infer below, I don't see a
particularly nice alternative at the moment.  Personally I think it
would be better to try and keep gnome-canvas on life support until Cairo
is ready...

= Bill

On Mon, 2004-11-15 at 15:50, Gustavo J. A. M. Carneiro wrote:
> Seg, 2004-11-15 às 11:53 +0000, Bill Haneman escreveu:
> > Hi:
> > 
> > Regarding gnome-canvas vs foo-canvas vs TBD-cairo-based thing: there's
> > some accessibility/ATK support in gnome-canvas, which is important. 
> > There isn't any, AFAIK, in alternatives.
> > 
> > Any thought of deprecating/replacing gnome-canvas needs to consider this
> > fact.  I also think there are problems with cairo since when I last
> > looked, it failed to have a nice-enough object-encapsulation API to make
> > ATK support feasible; that is, my impression was that cairo tended to
> > encourage unstructured drawing too much.
> > 
> > In order to make ATK support for canvas widgets possible, the widget
> > needs to support the notion of drawing objects at a fairly high level of
> > granularity, i.e. not at the level of drawing primitives.
> 
>   I never said Cairo was a gnome-canvas replacement.  What I said is
> that we should build a canvas widget on top of Cairo.  Cairo is
> "immediate mode" drawing, while gnome-canvas is "retained mode" (if I
> recall the correct terminology..).  Maybe it is technically possible to
> port gnome-canvas to Cairo in a API compatible way, at least for
> applications that don't make their own canvas items.  But if people
> complain about the current API, then it is probably not going to happen.
> 
>   Also Cairo is nowhere near API stable.  I think Cairo API stability
> and gtk+ integration is scheduled for gtk+ 2.8, so we have to wait a
> long time before considering to use any of this.
> 
> > 
> > regards
> > 
> > Bill
> > 
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> -- 
> Gustavo J. A. M. Carneiro
> <gjc inescporto pt> <gustavo users sourceforge net>
> The universe is always one step beyond logic.