/tmp/snapshot-pyside-6.2-rel/pyside-setup/examples/declarative/extending/chapter4-customPropertyTypes

(You can also check this code in the repository)

app.qml

//![0]
import Charts
import QtQuick

Item {
    width: 300; height: 200

    PieChart {
        id: chart
        anchors.centerIn: parent
        width: 100; height: 100

        pieSlice: PieSlice {
            anchors.fill: parent
            color: "red"
        }
    }

    Component.onCompleted: console.log("The pie is colored " + chart.pieSlice.color)
}
//![0]

customPropertyTypes.py

"""PySide6 port of the qml/tutorials/extending-qml/chapter4-customPropertyTypes example from Qt v5.x"""

import os
from pathlib import Path
import sys

from PySide6.QtCore import Property, QUrl
from PySide6.QtGui import QGuiApplication, QPen, QPainter, QColor
from PySide6.QtQml import QmlElement
from PySide6.QtQuick import QQuickPaintedItem, QQuickView, QQuickItem

# To be used on the @QmlElement decorator
# (QML_IMPORT_MINOR_VERSION is optional)
QML_IMPORT_NAME = "Charts"
QML_IMPORT_MAJOR_VERSION = 1


@QmlElement
class PieSlice (QQuickPaintedItem):

    def __init__(self, parent=None):
        QQuickPaintedItem.__init__(self, parent)
        self._color = QColor()

    @Property(QColor)
    def color(self):
        return self._color

    @color.setter
    def color(self, value):
        self._color = value

    def paint(self, painter):
        pen = QPen(self._color, 2)
        painter.setPen(pen)
        painter.setRenderHints(QPainter.Antialiasing, True)
        painter.drawPie(self.boundingRect().adjusted(1, 1, -1, -1), 90 * 16, 290 * 16)


@QmlElement
class PieChart (QQuickItem):
    def __init__(self, parent=None):
        QQuickItem.__init__(self, parent)
        self._name = None
        self._pieSlice = None

    @Property(str)
    def name(self):
        return self._name

    @name.setter
    def name(self, value):
        self._name = value

    @Property(PieSlice)
    def pieSlice(self):
        return self._pieSlice

    @pieSlice.setter
    def pieSlice(self, value):
        self._pieSlice = value
        self._pieSlice.setParentItem(self)


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

    view = QQuickView()
    view.setResizeMode(QQuickView.SizeRootObjectToView)
    qml_file = os.fspath(Path(__file__).resolve().parent / 'app.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)