how to prevent qgraphicsitem repaint while mouse move on it

[lni]

There are at least three different ways to handle your situation. One possibility is to render contents of your item to a pixmap and only update the pixmap when you're not moving the item and if you are then render the old contents. Second possibility is to enable one of the caching modes for the item which does essentially more or less the same. I forgot the third solution

I am having the same problem, that the QGraphicsItem will do unnecessary paint when the window lose/gain focus or on a mouse movement, even though there is no actual new exposure event occurring.

I think this is a bug that Qt should fix, rather than asking application developers to find a workaround...