6 files changed, 178 insertions, 0 deletions
diff --git a/examples/qml/referenceexamples/coercion/birthdayparty.py b/examples/qml/referenceexamples/coercion/birthdayparty.py
new file mode 100644
index 000000000..f6ad1ac35
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/birthdayparty.py
@@ -0,0 +1,41 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+from PySide6.QtCore import QObject, Property
+from PySide6.QtQml import QmlElement, ListProperty
+
+from person import Person
+
+
+# To be used on the @QmlElement decorator
+# (QML_IMPORT_MINOR_VERSION is optional)
+QML_IMPORT_NAME = "examples.coercion.people"
+QML_IMPORT_MAJOR_VERSION = 1
+
+
+@QmlElement
+class BirthdayParty(QObject):
+
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self._host = None
+        self._guests = []
+
+    @Property(Person)
+    def host(self):
+        return self._host
+
+    @host.setter
+    def host(self, h):
+        self._host = h
+
+    def guest(self, n):
+        return self._guests[n]
+
+    def guestCount(self):
+        return len(self._guests)
+
+    def appendGuest(self, guest):
+        self._guests.append(guest)
+
+    guests = ListProperty(Person, appendGuest)
diff --git a/examples/qml/referenceexamples/coercion/coercion.pyproject b/examples/qml/referenceexamples/coercion/coercion.pyproject
new file mode 100644
index 000000000..3c01c40c2
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/coercion.pyproject
@@ -0,0 +1,3 @@
+{
+    "files": ["main.py", "birthdayparty.py", "person.py", "example.qml"]
+}
diff --git a/examples/qml/referenceexamples/coercion/doc/coercion.rst b/examples/qml/referenceexamples/coercion/doc/coercion.rst
new file mode 100644
index 000000000..2ccdaeb4f
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/doc/coercion.rst
@@ -0,0 +1,35 @@
+.. _qml-inheritance-and-coercion-example:
+
+Extending QML - Inheritance and Coercion Example
+================================================
+
+This example builds on the :ref:`qml-adding-types-example` and the
+:ref:`qml-object-and-list-property-types-example` .
+
+The Inheritance and Coercion Example shows how to use base classes to assign
+types of more than one type to a property.  It specializes the Person type
+developed in the previous examples into two types - a ``Boy`` and a ``Girl``.
+
+Declare Boy and Girl
+--------------------
+
+The Person class remains unaltered in this example and the Boy and Girl C++
+classes are trivial extensions of it. The types and their QML name are
+registered with the QML engine.
+
+As an example, the inheritance used here is a little contrived, but in real
+applications it is likely that the two extensions would add additional
+properties or modify the Person classes behavior.
+
+Running the Example
+-------------------
+
+The BirthdayParty type has not changed since the previous example. The
+celebrant and guests property still use the People type.
+
+However, as all three types, Person, Boy and Girl, have been registered with the
+QML system, on assignment QML automatically (and type-safely) converts the Boy
+and Girl objects into a Person.
+
+The main.py file in the example includes a simple shell application that
+loads and runs the QML snippet shown below.
diff --git a/examples/qml/referenceexamples/coercion/example.qml b/examples/qml/referenceexamples/coercion/example.qml
new file mode 100644
index 000000000..c47678483
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/example.qml
@@ -0,0 +1,16 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import examples.coercion.people
+
+BirthdayParty {
+    host: Boy {
+        name: "Bob Jones"
+        shoe_size: 12
+    }
+    guests: [
+        Boy { name: "Leo Hodges" },
+        Boy { name: "Jack Smith" },
+        Girl { name: "Anne Brown" }
+    ]
+}
diff --git a/examples/qml/referenceexamples/coercion/main.py b/examples/qml/referenceexamples/coercion/main.py
new file mode 100644
index 000000000..9f49bc1da
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/main.py
@@ -0,0 +1,36 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+"""PySide6 port of the qml/examples/qml/referenceexamples/coercion example from Qt v6.x"""
+
+from pathlib import Path
+import sys
+
+from PySide6.QtCore import QCoreApplication, QUrl
+from PySide6.QtQml import QQmlComponent, QQmlEngine
+
+from person import Boy, Girl
+from birthdayparty import BirthdayParty
+
+
+app = QCoreApplication(sys.argv)
+qml_file = Path(__file__).parent / "example.qml"
+url = QUrl.fromLocalFile(qml_file)
+engine = QQmlEngine()
+component = QQmlComponent(engine, url)
+party = component.create()
+if not party:
+    print(component.errors())
+    del engine
+    sys.exit(-1)
+host = party.host
+print(f"{host.name} is having a birthday!")
+if isinstance(host, Boy):
+    print("He is inviting:")
+else:
+    print("She is inviting:")
+for g in range(party.guestCount()):
+    name = party.guest(g).name
+    print(f"    {name}")
+del engine
+sys.exit(0)
diff --git a/examples/qml/referenceexamples/coercion/person.py b/examples/qml/referenceexamples/coercion/person.py
new file mode 100644
index 000000000..69056014c
--- /dev/null
+++ b/examples/qml/referenceexamples/coercion/person.py
@@ -0,0 +1,47 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+from PySide6.QtCore import QObject, Property
+from PySide6.QtQml import QmlElement, QmlUncreatable
+
+# To be used on the @QmlElement decorator
+# (QML_IMPORT_MINOR_VERSION is optional)
+QML_IMPORT_NAME = "examples.coercion.people"
+QML_IMPORT_MAJOR_VERSION = 1
+
+
+@QmlElement
+@QmlUncreatable("Person is an abstract base class.")
+class Person(QObject):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+        self._name = ''
+        self._shoe_size = 0
+
+    @Property(str)
+    def name(self):
+        return self._name
+
+    @name.setter
+    def name(self, n):
+        self._name = n
+
+    @Property(int)
+    def shoe_size(self):
+        return self._shoe_size
+
+    @shoe_size.setter
+    def shoe_size(self, s):
+        self._shoe_size = s
+
+
+@QmlElement
+class Boy(Person):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+
+@QmlElement
+class Girl(Person):
+    def __init__(self, parent=None):
+        super().__init__(parent)