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import os
from pathlib import Path
import sys
from PySide6.QtCore import QObject, QUrl, Slot
from PySide6.QtGui import QGuiApplication
from PySide6.QtQuick import QQuickView
from PySide6.QtQml import QmlElement

# To be used on the @QmlElement decorator
# (QML_IMPORT_MINOR_VERSION is optional)
QML_IMPORT_NAME = "examples.signals.qmltopy2"
QML_IMPORT_MAJOR_VERSION = 1


@QmlElement
class RotateValue(QObject):
    def __init__(self):
        super().__init__()
        self.r = 0

    # If a slot returns a value, the return value type must be explicitly
    # defined in the decorator.
    @Slot(result=int)
    def val(self):
        self.r = self.r + 10
        return self.r


if __name__ == '__main__':
    app = QGuiApplication(sys.argv)
    view = QQuickView()

    qml_file = os.fspath(Path(__file__).resolve().parent / 'view.qml')
    view.setSource(QUrl.fromLocalFile(qml_file))
    if view.status() == QQuickView.Error:
        sys.exit(-1)
    view.show()
    res = app.exec()
    # Deleting the view before it goes out of scope is required to make sure all child QML instances
    # are destroyed in the correct order.
    del view
    sys.exit(res)
