void TrackGraphElement(Port port)
{
if (port.panel != null) // if the panel is null therefore the port is not yet attached to its hierarchy, so postpone the register
{
DoTrackGraphElement(port);
}
port.RegisterCallback <AttachToPanelEvent>(OnPortAttach);
port.RegisterCallback <DetachFromPanelEvent>(OnPortDetach);
}
void DoTrackGraphElement(Port port)
{
port.RegisterCallback <GeometryChangedEvent>(OnPortGeometryChanged);
VisualElement current = port.hierarchy.parent;
while (current != null)
{
if (current is GraphView.Layer)
{
break;
}
if (current != port.node) // if we encounter our node ignore it but continue in the case there are nodes inside nodes
{
current.RegisterCallback <GeometryChangedEvent>(OnGeometryChanged);
}
current = current.hierarchy.parent;
}
if (port.node != null)
{
port.node.RegisterCallback <GeometryChangedEvent>(OnGeometryChanged);
}
}