Re: [Re: [gnomemm] A couple Gnome::Canvas[2] issues...]

[Murray Cumming <murrayc usa net>]

Owen Stenseth <owen bonemachine org> wrote:
> On Mon, 2002-09-23 at 10:57, Paul Davis wrote:
> > >The first is that the behaviour of Canvas is different when expanding
> > >windows in the libgnomecanvas demo and the libgnomecanvasmm demo. In the
> > >libgnomecanvas demo, the canvas origin stays securly in the upper left
> > >hand corner of the container that it is in. In the libgnomecanvasmm
> > >implementation the origin of the canvas moves away from the top left
> > >corner proportional to the window resize that is occuring.
> > 
> > this sounds very related to a bug i filed in gnome bugzilla regarding
> > canvas "gravity". the canvas in v1 tried to center itself within the
> > size of the GtkLayout that is its (hidden) parent. a fix was added
> > that provided gravity options; someone complained that it broke
> > Evolution badly. i haven't tried it at all. its possible that the C
> > version sets the default gravity one way and the C++ one resets that. 
> 
> Yikes. A on closer inspection and figuring out what causes the canvas to
> scroll like that I have discovered that the default for the canvas is
> center_scroll_region = true. The libgnomecanvas demo sets this to false
> wheras the libgnomecanvasmm demo does not.

If that demo is meant to be a C++-ization of the C demo then please patch the
C++ demo to correct it. If there is not C++-ization of a C demo then that's a
bug that should be reported.


Murray Cumming
murrayc usa net
www.murrayc.com