QT: Scroll widget that renders directly to the DC

Posted by shoosh on Stack Overflow See other posts from Stack Overflow or by shoosh
Published on 2010-03-22T19:03:32Z Indexed on 2010/03/23 16:43 UTC
Read the original article Hit count: 391

Filed under:

qt

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Windows

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device-context

I'm trying to create a widget which paints directly to the windows Device Context by calling getDC() and painting an HBITMAP to it.
The widget I'm painting resides inside a scroll widget.
I've implemented the paintEvent() and it does seem to paint but immediatly after painting the widget gets painted over again with a blank gray color.

I've tried setting WA_PaintOnScreen and Qt::WA_NoSystemBackground but none of those help.
In theory this should be possible since this is basically how the GLWidget works.

What am I missing?

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