It uses the raster engine. See here for historical informations.

Hi @atessadri,

I would like to know how to understand when the animation embedded in the transition is really finished.
Is there any signal to catch ?

Yes there is. Transition has running property so you can use the onRunningChanged signal handler inside it. Eg:

Transition { ... onRunningChanged: if(!running) console.log("Stopped") }

Sorry I don't have answers to your other questions.