[Interest] How to embed a "rdesktop" window in a QGraphicsScene

[Francisco Ares]

Em sáb, 22 de set de 2018 às 12:59, Thiago Macieira <
thiago.macieira at intel.com> escreveu:

> On Saturday, 22 September 2018 06:45:09 PDT Francisco Ares wrote:
> > Em sáb, 22 de set de 2018 03:03, Thiago Macieira <
> thiago.macieira at intel.com>
> > escreveu:
> > > On Friday, 21 September 2018 20:47:50 PDT Francisco Ares wrote:
> > > > Now I want to do some fancy stuff like switching among several remote
> > > > desktop sessions in a QGraphicsScene environment. So I started to try
> > >
> > > using
> > >
> > > > the same QWidget, but inside a QGraphicsProxyWidget, so the
> rdesktop's
> > > > QWidget could be presented as a QGraphicsItem with all sorts of
> > > > deformations possible on to it.
> > >
> > > Not possible.
> >
> > Thanks, Thiago, but could you tell me a bit more? What's the difference
> > between a common QWidget and one embedded in a QGraphicProxyWidget?
>
> The difference is that a QWidget is not transformed and it can have an
> actual,
> top-level window ID. A proxy widget doesn't, it gets painted into an
> internal
> QPixmap and then transformed by the graphics view engine. The only way to
> do
> that with an external tool would be for the external tool to give you its
> window contents in a QPixmap, which means you need to modify it to
> communicate
> with your wrapper app.
>
> Instead of doing that, use OpenGL and shared content (buffers, textures,
> whatever). Then you can use OpenGL to transform the content you got into
> whatever you want it to be. This is actually the entire principle behind
> Wayland.
>
> > And would a QWidget embedded in a QMainWindow work?
>
> Yes, that's not a problem.
>
> --
> Thiago Macieira - thiago.macieira (AT) intel.com
>   Software Architect - Intel Open Source Technology Center
>
>
>
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Thank you.

Francisco
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