Qt Examples: PortedCanvas

[majvan]

Hello, I am looking at the example of Qt: PortedCanvas (Qt 4.7.4).
In that example you can insert mesh.
I cannot understand why when I move the node with my mouse, the code

QVariant NodeItem::itemChange(GraphicsItemChange change, const QVariant &value)

QVariant NodeItem::itemChange(GraphicsItemChange change, const QVariant &value)

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is never called. As I can see from the code, it should ensure that also lines connected to the node should move (every NodeItem has its container of out-lines and in-lines).

Is there some issue in the example? Does anybody has the same experience with the given example?

[wysota]

It's an old example and Qt has come a long way since it was written. In current versions of Qt itemChange() is not called for every change in the item, for those you need to explicitly register using QGraphicsItem::setFlag() passing in QGraphicsItem::ItemSendsGeometryChanges or QGraphicsItem::ItemSendsScenePositionChanges (depending on the effect you want to achieve).

[majvan]

Thank you. Now it works.