Adding more attached properties to Accessible - cannot assign to non-existent property

bjdm

Hi,

I've been trying to add an additional extended property to Accessible in an effort to see if I can get labelledBy etc. to work but am having an issue accessing the new attached property (cannot assign to non-existent property "labelledBy").

I have copied the implementation of description in qtdeclarative/src/quick/items/qquickaccessibleattached_p.h and changed to property name to labelledBy, but it is otherwise exactly the same ie. a simple QString property. To test this, I have set Accessible.labelledBy: "test" in a KDE application (tokodon) built against my own libQt5Quick.so which has been confirmed with ldd and cat /proc/$(pidof tokodon)/maps | grep Quick.

A patch of the changes is here:

diff --git a/src/quick/items/qquickaccessibleattached_p.h b/src/quick/items/qquickaccessibleattached_p.h
index c24bce7bda..24110f10d4 100644
--- a/src/quick/items/qquickaccessibleattached_p.h
+++ b/src/quick/items/qquickaccessibleattached_p.h
@@ -88,6 +88,7 @@ class Q_QUICK_PRIVATE_EXPORT QQuickAccessibleAttached : public QObject
     Q_PROPERTY(QAccessible::Role role READ role WRITE setRole NOTIFY roleChanged FINAL)
     Q_PROPERTY(QString name READ name WRITE setName NOTIFY nameChanged FINAL)
     Q_PROPERTY(QString description READ description WRITE setDescription NOTIFY descriptionChanged FINAL)
+    Q_PROPERTY(QString labelledBy READ labelledBy WRITE setLabelledBy NOTIFY labelledByChanged FINAL)
     Q_PROPERTY(bool ignored READ ignored WRITE setIgnored NOTIFY ignoredChanged FINAL)
 
     QML_NAMED_ELEMENT(Accessible)
@@ -146,6 +147,15 @@ public:
         }
     }
 
+    QString labelledBy() const { return m_labelledBy; }
+    void setLabelledBy(const QString &labelledBy)
+    {
+        if (m_labelledBy != labelledBy) {
+            m_labelledBy = labelledBy;
+            Q_EMIT(labelledByChanged());
+        }
+    }
+
     // Factory function
     static QQuickAccessibleAttached *qmlAttachedProperties(QObject *obj);
 
@@ -205,6 +215,7 @@ Q_SIGNALS:
     void roleChanged();
     void nameChanged();
     void descriptionChanged();
+    void labelledByChanged();
     void ignoredChanged();
     void pressAction();
     void toggleAction();
@@ -226,6 +237,7 @@ private:
     QString m_name;
     bool m_nameExplicitlySet = false;
     QString m_description;
+    QString m_labelledBy;
 
     static QMetaMethod sigPress;
     static QMetaMethod sigToggle;

I get the feeling I'm likely missing something obvious as everything appears to be as it should, my only though is maybe moc is doing something funny so I have cleaned and rebuilt and still the same result so I'm really not sure.

Any help would be much appreciated.

Many thanks,
Brent