[Qt-interest] Painting on Scrollbars

[Freddie Witherden]

Hi,

I am wondering how to go about painting on the "page control" area of a
QScrollBar (by way of subclassing it). This can be seen here
http://doc.trolltech.com/4.5/images/qscrollbar-picture.png labelled as
"c". Looking at the API for QScrollBar and QAbstractSlider I see no
intuitive way of querying the dimensions of this region.

Furthermore, I am also interested in getting the dimensions of the
actual slider itself (so how wide it is and where it starts).

I am interested in this information because I am currently in the
process of writing a marked scrollbar widget (of similar ilk to those
found in many OS X applications). By having small lines - or marks - on
the scroll track it is possible to highlight regions of interest in the
scroll view. These could be compiler warnings/errors or the location of
matches in a find-and-replace search. However, to do this, one needs to
be able to get the dimensions of the scroll track in order to be able to
paint to it.

Regards, Freddie.