Re: canvas notes

["muppet" <scott asofyet org>]

Gustavo J. A. M. Carneiro said:
> On Wed, 2005-09-07 at 16:54 +0200, Alexander Larsson wrote:
>> On Mon, 2005-08-15 at 02:38 -0400, Havoc Pennington wrote:
>> > 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?

I think the point is that the simple approach doesn't deal with arbitrary
transformations.




-- 
muppet <scott at asofyet dot org>