QGesture

http://www.qtcentre.org/threads/40644-QGraphicsView-and-QGesture-issues

http://blog.sina.com.cn/s/blog_5106eff10100ntnr.html

http://blog.sina.com.cn/s/blog_5106eff10100ntnr.html

http://www.qtcentre.org/threads/40644-QGraphicsView-and-QGesture-issues?p=186561&mode=threaded

http://www.qtcentre.org/threads/40644-QGraphicsView-and-QGesture-issues

https://stackoverflow.com/questions/34807225/how-to-scale-the-contents-of-a-qgraphicsview-using-the-qpinchgesture

http://blog.csdn.net/firefox0123/article/details/40823559

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