Porting Qt-based UI to QML
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This is true. The closest you can get to re-using widget code is to port your QWidget into QQuickPaintedItem. This will at least allow you to re-use your qpainter drawing code. We are working on making it possible to embed qtquick 2 inside QWidget. This would make it possible to at least partially make use of qt quick in your application. This is will happen in 5.1 earliest.