White background in window, getting desperate!

[Lesiok]

Hi, thanks for your answer. However, please read the thread from the beginning. I'm blocking the thread (and the event loop) on purpose, in order to demonstrate a problem (bug?) that I have hit with Qt.

By the way, just to gather some more stats: have you tried the application demonstrating the problem? If so, do you see the window's background being filled to white before the window's content gets rendered? What's your operating system?

Cheers,
Franz

Yes, I have tried this demo and have this same behaviour as fatjuicymole. After changing sleep method all is working perfect.
On Windows VISTA with AERO background is white, without AERO window have no background. This is a problem with Windows not with Qt.
And in Yours real application You must blocking event loop with some long process.

[dictoon]

Yes, I have tried this demo and have this same behaviour as fatjuicymole. After changing sleep method all is working perfect.
On Windows VISTA with AERO background is white, without AERO window have no background. This is a problem with Windows not with Qt.
And in Yours real application You must blocking event loop with some long process.

About the sleep method: again, I inserted calls to Sleep() in order to block the current thread and prevent messages from being processed, *intentionally*. This is just a test app to demonstrate the problem, and make it obvious.

About Aero: that's very interesting, I didn't think of trying with Aero disabled. So this seems to confirm that it's a Windows bug, and that's it's specific to Vista+Aero. Would love to find a workaround on this platform. Good to know that the problem does not seem to be reproducible on Windows 7.

Thanks for your input.

Cheers,
Franz

[Lesiok]

About the sleep method: again, I inserted calls to Sleep() in order to block the current thread and prevent messages from being processed, *intentionally*. This is just a test app to demonstrate the problem, and make it obvious....

I know this. Therefore I wrote in my last clause And in Yours real application You must blocking event loop with some long process (called after showing window).

[dictoon]

I know this. Therefore I wrote in my last clause And in Yours real application You must blocking event loop with some long process (called after showing window).

Of course in my real app I don't have any sleep(), nor do I have any long process running I just have a very basic window, with half a dozen very basic controls. It's just that this window (like all windows of my application) has a dark gray background, and when I bring it to the screen -- by calling show() on it -- there's a very noticeable, very disturbing white flash due to the fact that the window first appears with a completely white background, leaving a small delay until the real window contents gets rendered.

Cheers,
Franz