How does Qt implement layers?

[FinderCheng]

How does Qt implement layers just like Photoshop and Paint.NET? I want to use Graphics View Framework, there are a scene and a viewer, so how I can add layers? What class can be set as layers? Mutil-QGraphicsView? Could you give me a hand? Thank you!

[high_flyer]

Your question is confused.
Start by reading the Graphics View Framework (http://doc.trolltech.com/4.5/graphicsview.html) - it will explain the general way things work.

Then, if your have specific questions about that, it will be easier to give you an answer.