drawBackground function.....

I'd like to know how this function operate:

void drawBackground(QPainter *painter, const QRectF &rect);

I Know that this function is called when a repaint event is being.
Now.....what kind of settings has the painter?
How can I set them? and the rect?

I also don't understand why the "scene->setBackgroundBrush()" doesn't work when the virtual function drawBackground() is reimplemented(in a scene or view subclass).....

I'd also like to have some examples.....

excuse me for my poor english, i hope that you can understand me!!! Thanks a lot.

How about taking a look at documentation of QPainter, QRectF and QGraphicsScene::drawBackground()?

I forget to tell you that i saw a lot of times the reference........

Do not look at it - read it :)

I can only repeat what is written there especially that I don't know what exactly you want to know. Read the docs and when you have specific questions, ask them.

As for the only specific (yet trivial) question I see:

Quote:

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I also don't understand why the "scene->setBackgroundBrush()" doesn't work when the virtual function drawBackground() is reimplemented(in a scene or view subclass).....

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Because the background brush is used by the default implementation of drawBackground(), so when you reimplement it without calling the base class explicitely, it won't be used.

;)

the bakgroundbrush works if a call the base class

Code:

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QGraphicsScene::drawBackground(QPainter *painter, const QRectF &rect);

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...thx