Focus/Activation problem for widget in nested QGraphicsScenes

[Spitfire]

I know almost nothing about OpenGL, but the first thing that springs to my mind is: use OpenGL only
You should be able to add any widget to gl scene and render it in single view.

Like I've said - I've never done it, but maybe this article will help you.

[peers]

You should be able to add any widget to gl scene and render it in single view.

Like I've said - I've never done it, but maybe this article will help you.

What do you mean with single view?

I know that article, however as I understood it I can only render one openGL scene per graphics scene. But because I need to show several openGL scenes at once I think I need more than one graphics scene. And because I would like to handle these 'inner' scenes like any QGraphicsItem (thats why I add the associated views to the outer scene via a proxy) I need the 'nested' scenes.

Thanks anyway

[Spitfire]

What I can't figure out is why you need many scenes?
It doesn't seem right to me.

From what I see you want to have gl and q items and widgets in a scene.
have signle gl scene, add what you want to it and that's it. Where you get other scenes? Is it imposed on you?
If you want to manipulate group of elements together, create a widget from that elements, or group them together, or use layout in the scene.

You didn't say what you're trying to do but I'm guessing that nested scenes will be troublesome in many ways and you should think about different solution.

Anyway, good luck

[peers]

I am working on a system which has to display measurement data. This data is of different kind, curves, images, etc., some of it we visualise using OpenGL. The reason for several OpenGL scenes is that we display data from multiple sources in parallel, sometimes we display data from one source in more than one scene because the visualisation of the same data can be done different to see different things in it. This is the motivation for wanting to have different OpenGL scenes in an 'outer' scene.

The Graphics Scene/View framework provides all the flexibility we need now and it provides enough flexibility for what we want in the future, that is why, at the moment, I try to find out how we can realise our current application using this framework. The only problem I have so far is the described problem with multiple OpenGl scene.

What I am doing now is to evaluate whether we really need OpenGL. Before we needed it because we had to display image data with a high update rate. The system was designed and first developed almost 10 years ago, that time OpenGL was what we needed. Now, however, I think we could get away with using a QImage as off buffer and then, in the paint routine of a QGraphicsItem, paint modified parts of the QImage. So far my first tests are promising.

Regards
Peer