Determing a paint device

[steno]

I couldn't find anything, but I want to make sure I didn't over look anything. In a widget's paintEvent, can you find out what you are painting to? ie a image, screen or printer?

[andre]

You could try dynamic casting the paintDevice that you can get from QPainter to one of the possible subclasses of QPaintDevice, and checking if you get a non-0 result?

[giesbert]

But ensure, that Qt was build using RTTI, which is switched off by default. qobject_cast does not work, as QPaintDevice is not a subclass of QObject.

[dangelog]

Grab the QPaintDevice from the QPainter, then the QPaintEngine using QPaintDevice::paintEngine(), and finally use type() to figure it out.

(BTW, are we talking about things like QWidget::render? If not, what's exactly your use case?)

[steno]

[quote author="peppe" date="1316815782"](BTW, are we talking about things like QWidget::render? If not, what's exactly your use case?)[/quote]

Correct, I'm trying to prevent certian attributes from being painted when painting to a printer in a custom widet that I'm working on.

[dangelog]

Then you can use type(). :)