QScrollArea vs. QAbstractScrollArea

[wysota]

QPaintDevice is pure virtual

[zaphod.b]

QPaintDevice is pure virtual

That's ok. Just declare QAbstractScrollArea::setViewport(QPaintDevice *); and leave it to the caller if he passes a QWidget or another QPaintDevice instance. If there isn't a good reason for a QWidget formal parameter, that is...

[wysota]

Well... the viewport is a widget. The abstract scroll area is composed of the "main" widget, two scrollbars and a viewport. At some point you need to draw on the viewport and if you were drawing on anything else than a widget (like a printer) it might be hard to copy the result to screen later on.

[zaphod.b]

if you were drawing on anything else than a widget (like a printer) it might be hard to copy the result to screen later on.

Good point.

I think I'd rather not pester you further on this unless I achieve better permeation of the topic...
For I might want to resort to your help again in the future.

Thank you!

[wysota]

Don't worry, there is no risk for you