[Interest] QGraphicsView: selection area drawing

[Christian Gagneraud]

Hi there,

I've implementing a "zoom area" tool on a QGraphicsView, while dragging 
the mouse it draws the zoom area in a (visually) similar way as the 
RubberBandDrag selection area. I've looked into the source code of 
QGraphicsView but couldn't find which color is used to draw it.
I've pinned down the QStyleOptionRubberBand and QStyleOption::OptionType 
but I don't get how I should use it.
My naive implementation draws the area using a QGraphicsRectItem, but 
I've discovered that QGraphicsView draws the selection area using a 
painter in paintEvent() (after calling drawForeground()).
What is the best way to draw the zoom area, should I handle this in 
drawForeground()? The code in QGraphicsView looks over-complicated to me 
compared with using a QGraphicsRectItem.

Any thought or advice?

Chris