Re: canvas notes
- From: Alexander Larsson <alexl redhat com>
- To: "Gustavo J. A. M. Carneiro" <gjc inescporto pt>
- Cc: gtk-devel-list gnome org, Havoc Pennington <hp redhat com>
- Subject: Re: canvas notes
- Date: Thu, 08 Sep 2005 19:12:17 +0200
On Thu, 2005-09-08 at 17:05 +0100, Gustavo J. A. M. Carneiro wrote:
> > In my initial thinking about this and talking to various people about it
> > i've notived that this is pretty essential for a usable canvas:
> > > 4. Widget embedding. Absolutely critical to using the canvas
> > > for real-world UI. The widget embedding can't be broken
> > > as in GnomeCanvas or it isn't useful; layering and events must work
> > > properly. Affine transforms probably should work properly, and
> > > when you think about animations (minimization, etc.) could even be
> > > useful.
> > The obvious way to do this is to get a GtkWidget to render into a pixmap
> > and then draw that pixmap translated on the screen (and translate events
> > into it).
> I don't understand. Is there a problem creating a gdk subwindow,
> child of the canvas widget window, and putting it at the right
> coordinates, effectively sitting on top of the canvas? Sure, you
> wouldn't get transparency (shaped widgets, same problem in the gnome
> panel), this way, but that's a limitation we can live with, I suppose?
You don't get layering right, and no transformations. The widgets won't
be in the canvas, just sort of stick on top of it. For many cool uses of
a canvas this just isn't good enough.
Alexander Larsson Red Hat, Inc
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