transparent QScrollArea and blurry scrolling

[titanandrews]

Hi All,

I have the following code to create a QScrollArea that is transparent with it's content also being transparent. So I want the northPanel's parent to show through.

QWidget* northPanel = new QWidget(this);    
northPanel->setAttribute(Qt::WA_NoBackground);    
// add some content to northPanel
QScrollArea* scroller = new QScrollArea(this);    
scroller->setAttribute(Qt::WA_NoBackground);
scroller->setWidget(northPanel);

QWidget* northPanel = new QWidget(this);    
northPanel->setAttribute(Qt::WA_NoBackground);    
// add some content to northPanel
QScrollArea* scroller = new QScrollArea(this);    
scroller->setAttribute(Qt::WA_NoBackground);
scroller->setWidget(northPanel);

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This works fine. However, when I scroll, the northPanel becomes blurred. I'm pretty sure it's because NoBackground attribute causes those widgets to not paint the background. What am I missing here? How do I make a transparent QScrollArea? Do I need to force a repaint or something?

many thanks,

B