embed a qdialog into qwidget (Qt c++)

Pl45m4

@Kaguro said in embed a qdialog into qwidget (Qt c++):

the edges start to creep while moving, so they don't stay rigid

Do they leave a trace on the screen? Or is it some blur effect? Can you show it?
Could be an issue with your stylesheet. Is it the same, when you don't set the stylesheet?

Kaguro

@Pl45m4 I would rather say that the edges of the widget slide inwards. I tried it without
stylesheet (I just gave it a background-color that dont be transparent) and it's the same result:( Sure here is what the widget do while moving it:
video

Axel Spoerl

@Kaguro
The video looks like a rendering glitch to me, which becomes more obvious on a widget without frame margins.
But since everything gets rendered nicely when the drag stops, I have the impression that the glitch is not Qt related.
In essence, there's no difference in how a widget is painted during or after a drag.

The fact having a style sheet or not doesn't influence the glitch, would fit into this picture.

Have you tried the reproducer on different computers with fast/slow graphics?

Kaguro

@Axel-Spoerl
hmm interesting. Would it depend on the computer? I've only tested it on my work machine, but I'll test it at home too, where I have a faster computer. But it needs faster graphics card? Does this render require that much? What is interesting too: If i set the widget's setContentMargins, higher the number I set, the less the glitch occurs. In the video the contentmargins are 0.

Axel Spoerl

@Kaguro
I am speculating now. I can't see any glitch on my PC, but it's a fast one with a native NVIDIA driver.
The glitch on the video (watched in slomo) looks like rendering on the "new" position starts, before rendering on the "old" position stops. And as said before, technically there is no difference between rendering "on the move" and "at the end of the move". Wouldn't make sense - we can't predict, when a user stops moving.

Kaguro

@Axel-Spoerl
I understand. I will try it at home and report back!
it's just not so nice, just that the edges don't glitch when i do it with QDialog (Of course, then they are not in the same window).

Kaguro

@Axel-Spoerl @Pl45m4 hmmm interesting at my home (much faster video card and better in everything) and it doesn't works perfectly i see the glitch here too :(

Kaguro

@Axel-Spoerl @Pl45m4
Do you think I can do anything with this behavior?

Axel Spoerl

@Kaguro
I completely fail to reproduce that.
If you are able to make a video, you could certainly file a bug report at https://bugreports.qt.io

Kaguro

@Axel-Spoerl It's very weird to me that it works differently at you. Maybe can you also show in a video what you see? (I will try make a bug report but for some reason I think this is not a bug, especially if you don't see this behavior)

Axel Spoerl

@Kaguro
Well, even if the bug will be closed without a fix, we should have a look at it.