Display QQmlApplicationEngine

[Ruchit Bhatt]

How to run & display QQmlApplicationEngine in Maya using PySide2?

Here is my code

class Ball(QObject):
    def __init__(self):
        QObject.__init__(self)

    @Slot(int)
    def add(arg1):
        mc.polySphere(r=arg1)
       
       
engine = QQmlApplicationEngine()
ball = Ball()
engine.rootContext().setContextProperty("ball", ball)
engine.load(QUrl.fromLocalFile("E:/code/QML/sphere.qml"))

[Justin Israel]

Is it giving you an error? You do have a bug in your Ball.add(). It should be 

@Slot(int)
def add(self, arg1):
    mc.polySphere(r=arg1)

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[Ruchit Bhatt]

I did few test with QQMLAPPLICATIONENGINE outside Maya & everything works fine. Problem with Maya is, If I use
app = QApplication(sys.argv)

Maya give a error
# Error: RuntimeError: A QApplication instance already exists. #

I have no idea how to show QQmlApplicationEngine window in Maya..Many people use QQuickView.show() but I found QQmlApplicationEngine is more powerful than QQuickView.

[Justin Israel]

Maya already has a QApplication instance running. So I would think you just create the engine and load your file. 

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