Re: gnome canvas items do not appear until window resize

["Ladanyi, Akos" <ladanyi tmit bme hu>]

Hi,

This seems to be a bug in openSUSE 10.3. This does not happen under
Ubuntu 7.10 and Fedora 8 Test 3. (All of these three distros have
libgnomecanvasmm 2.20.0.)

Sorry for the noise.

regards,
Akos

On Sat, 2007-10-20 at 17:55 +0200, Ladanyi, Akos wrote:
> Hi,
> 
> I modified the 'examples/canvas/canvas.cc' file included in the
> libgnomecanvasmm-2.20.0 tarball so that it draws a red circle when I
> click on the canvas. This is what I did:
> 
> 33a34
> >   bool OnEvent(GdkEvent* e);
> 75a77,96
> > 
> >   signal_event().connect(sigc::mem_fun(*this,
> &CanvasExample::OnEvent));
> > }
> > 
> > bool CanvasExample::OnEvent(GdkEvent* event)
> > {
> >   switch (event->type)
> >   {
> >     case GDK_BUTTON_PRESS:
> >       if (event->button.button == 1)
> >       {
> >         double x, y;
> >         window_to_world(event->button.x, event->button.y, x, y);
> >         using Gnome::Canvas::Ellipse;
> >         Ellipse* ellipse = Gtk::manage(new Ellipse(m_canvasgroup,
> >               x-10.0, y-10.0, x+10.0, y+10.0));
> >         *ellipse << Gnome::Canvas::Properties::fill_color("red");
> >       }
> >   }
> >   return false;
> 
> My problem is that the red circles do not appear until the window is
> resized. What's wrong with this code?
> 
> regards,
> Akos Ladanyi
> 
> PS: Attached the modified canvas.cc.
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