Add infrastructure to connect properties from Quick API to the Q3DS API

Removes the syncProperties() function, as it's strictly not needed
anymore. If there's a need to intercept one or more property change,
two different options are provided:
1. Add a property on the target object that is prefixed with "qq_" or
2. Re-implement the propertChanged() function.

Change-Id: If2ef181f09f17916b0d2d9606663175958e46e77
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/runtime/q3dsuippresentation.cpp b/src/runtime/q3dsuippresentation.cpp
index 23836f0..11c2aa6 100644
--- a/src/runtime/q3dsuippresentation.cpp
+++ b/src/runtime/q3dsuippresentation.cpp
@@ -40,6 +40,7 @@
 #include <QtMath>
 #include <QImage>
 
+#include <QtCore/qobject.h>
 #include <QtCore/qmetaobject.h>
 
 QT_BEGIN_NAMESPACE
@@ -411,6 +412,12 @@ Q3DSGraphObject::Q3DSGraphObject(Q3DSGraphObject::Type type)
 
 Q3DSGraphObject::~Q3DSGraphObject()
 {
+    const QVariant v = property(QByteArrayLiteral("_q3dsbinding"));
+    if (v.isValid()) {
+        QObject *src = v.value<QObject *>();
+        QMetaObject::invokeMethod(src, "unbind", Qt::DirectConnection);
+    }
+
     destroyGraph();
     delete m_attached;
 }