Why QStyleFactory::keys() is missing?
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Not all platform has all styles.
So my guess would be you do this on windows 7 or newer.
Also They removed some in Qt5
http://blog.qt.io/blog/2012/10/30/cleaning-up-styles-in-qt5-and-adding-fusion/"The styles we are primarily planning on removing are Motif, CDE, Cleanlooks and Plastique. Windows (classic) "