QGraphicsItem::itemChange() may do what you want: http://doc.qt.nokia.com/4.7-snapshot/qgraphicsitem.html#itemChange
Martin. From: qt-qml-boun...@trolltech.com [mailto:qt-qml-boun...@trolltech.com] On Behalf Of ext Charley Bay Sent: Tuesday, 23 November 2010 12:51 PM To: qt-qml@trolltech.com Subject: [Qt-qml] C++ MyClass to detect child added/removed from QML I'm sure the answer is simple, but I can't find it: I want my C++ implemented QML object to be notified when children are added: //FILE: MyFile.qml import Qt 4.7 import MyCppClass 1.0 Rectangle { MyCppClass { id: myCppClass Text { text: "some text" } // CHILD NOT DETECTED AS ADDED } Text { text: "some other text" parent: myCppClass // CHILD NOT DETECTED AS ADDED } } In both the cases above, I'm unable to find a slot/notification/virtual function in the C++ implementation of MyCppClass that I can use to detect these children that are added. Since MyCppClass derives from QDeclarativeItem, I see that it is a QGraphicsObject, mulitply-derived from from both QObject and QGraphicsItem. I stumbled onto "virtual QObject::childEvent(QChildEvent*)" which looked ideal (since QChildEvent has child add/remove info), but it's not called in either of the cases above. Then, digging into the Qt docs, I see that QGraphicsObject users should *NOT* look to QObject for parent/children relationships, but rather, should look only to QGraphicsItem. Seems reasonable. Unfortunately, I could not find anything in QGraphicsItem that looked like a slot or virtual function I could override to receive "add/remove child" notification events (I need both). I'm sure this is a simple answer -- what notification does QML trigger that I can catch on the C++ side for (re-)parenting? Thanks! --charley
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