[Qt-interest] Transparent QGraphicsView

[Enrico Ros]

QGraphicsView is a QAbstractScrollArea that is a QWidget.

Being a Scroll Area, it has an internal "viewport" widget, and you have to 
look there for making the QGW completely transparent. So try to set a 
transparent palette on the qgv->viewport() and issue 
'setAutoFillBackground(false)' to the viewport too.

I just found out that the viewport uses the 'base' palette color to fill the 
background, so just setting:


Enrico

P.S:
This will make the QGraphicsView to not paint any background. If it's a top-
level-widget (also known as 'a window') and you want to see behind it, make 
sure to set the Qt::WA_TranslucentBackground attribute like this:
  qgv->setAttribute(Qt::WA_TranslucentBackground, true)


On Friday 21 August 2009 15:22:49 Giuliano Vilela wrote:
> Hello,
> 
> I'm wondering if it's possible to have a QGraphicsView with a
> transparent background. I tried setting the background brush of both
> the QGraphicsView and the QGraphicsScene to Qt::NoBrush and it didn't
> work. Any toughts?
> 
> Thanks!
> 
 
 
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