i'm trying to achieve ...

i have made a custom class called 'customgraphicsview' witch inherits from '"QGraphicsView".
as you can see in the picture, i have been playing a bit with style sheets on the scrollbar.

i would like to know how to create a 'vrtual transparant overlay' and add the custom scrollbar.
in the currect state i already controll the QGraphicsView.

i created the custom class 'customgraphicsview'.
because i think to preserve the scrollbar events and property and keep them applied.

i would like to add mouseHover events to the transparant 'overlay' so i can switch the visibility of the scrollbar.
similar to what you can see in Google Earth.

kind regards and thank you for reading

p.s. the original project is the 'embedded dialog demo'