QGraphicsView background color different from QGraphicsScene

[wazzdaman]

Hi,

I'd like to paint the background of QGraphicsView in a different color than I'm using in QGraphicsScene::drawBackground(). I use drawBackground() for some custom drawing in sceneRect() so using setBackgroundBrush() is out of question.

How can I do this? Any tips?

Thanks a lot!

[JonB]

@wazzdaman
There is void QGraphicsView::drawBackground(QPainter *painter, const QRectF &rect). It's virtual protected.

When you say " I use drawBackground() ..." are you talking about on QGraphicsScene or QGraphicsView? View defaults to scene, but you override view one if you want different background.

[JoeCFD]

@wazzdaman Try to add an openglwidget to the viewport of QGraphicsView and set different background color to it? I did not try it.

[wazzdaman]

@JoeCFD @JonB

Thanks for your comments! I override QGraphicsScene::drawBackground() for my purposes.

It turned out it's easier to solve this issue than I thought. I just changed my code in drawBackground() to this code and it worked perfectly:

painter->fillRect(rect, QBrush(Qt::lightGray));
painter->setClipRect(sceneRect() & rect);
painter->fillRect(sceneRect(), Qt::white);

Is there any simpler way to do this?

[JonB]

@wazzdaman said in QGraphicsView background color different from QGraphicsScene:

I'd like to paint the background of QGraphicsView in a different color

Since you wrote this I would expect you to be overriding QGraphicsView::drawBackground() for this, rather than QGraphicsView::drawScene(), regardless of what you might be doing in QGraphicsScene::drawBackground().

[wazzdaman]

@JonB I moved my code into QGraphicsView::drawBackground() as you recommended, it works nicely. Thanks a lot!