1 files changed, 20 insertions, 7 deletions
diff --git a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py
index 52af2fe97..eacb5201d 100644
--- a/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py
+++ b/examples/qml/tutorials/extending-qml-advanced/advanced6-Property-value-source/birthdayparty.py
@@ -15,18 +15,21 @@ QML_IMPORT_MAJOR_VERSION = 1
 
 @QmlAnonymous
 class BirthdayPartyAttached(QObject):
+    rsvp_changed = Signal()
 
     def __init__(self, parent=None):
         super().__init__(parent)
         self._rsvp = QDate()
 
-    @Property(QDate)
+    @Property(QDate, notify=rsvp_changed, final=True)
     def rsvp(self):
         return self._rsvp
 
     @rsvp.setter
     def rsvp(self, d):
-        self._rsvp = d
+        if self._rsvp != d:
+            self._rsvp = d
+            self.rsvp_changed.emit()
 
 
 @QmlElement
@@ -34,30 +37,39 @@ class BirthdayPartyAttached(QObject):
 @QmlAttached(BirthdayPartyAttached)
 class BirthdayParty(QObject):
 
+    announcement_changed = Signal()
+    host_changed = Signal()
+    guests_changed = Signal()
     partyStarted = Signal(QTime)
 
     def __init__(self, parent=None):
         super().__init__(parent)
+        self._announcement = ""
         self._host = None
         self._guests = []
 
     def startParty(self):
         self.partyStarted.emit(QTime.currentTime())
 
-    @Property(Person)
+    @Property(Person, notify=host_changed, final=True)
     def host(self):
         return self._host
 
     @host.setter
     def host(self, h):
-        self._host = h
+        if self._host != h:
+            self._host = h
+            self.host_changed.emit()
 
-    @Property(str)
+    @Property(str, notify=announcement_changed, final=True)
     def announcement(self):
-        return ""
+        return self._announcement
 
     @announcement.setter
     def announcement(self, a):
+        if self._announcement != a:
+            self._announcement = a
+            self.announcement_changed.emit()
         print(a)
 
     def guest(self, n):
@@ -68,9 +80,10 @@ class BirthdayParty(QObject):
 
     def appendGuest(self, guest):
         self._guests.append(guest)
+        self.guests_changed.emit()
 
     @staticmethod
     def qmlAttachedProperties(self, o):
         return BirthdayPartyAttached(o)
 
-    guests = ListProperty(Person, appendGuest)
+    guests = ListProperty(Person, appendGuest, notify=guests_changed, final=True)