Resize background color

I h开发者_如何学Goave a Windows app for which when the window is quickly made bigger pieces of "whitespace" are temporarily created.

Is there a way to make those pieces of whitespace black?

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You can set autoFillBackground property of the window and have Qt paint the newly exposed background for you. There are some Windows specific attributes mentioned there, too. Mainly, WA_NoSystemBackground needs to be set to use a different background color.