protected virtual void OnMouseDown(MouseDownEvent e)
{
if (active)
{
e.StopImmediatePropagation();
return;
}
if (!CanStartManipulation(e))
{
return;
}
var graphElement = target as Port;
if (graphElement == null)
{
return;
}
mouseDownPosition = e.localMousePosition;
edgeCandidate = graphView != null?graphView.CreateEdgeView() : new EdgeView();
edgeDragHelper.draggedPort = graphElement;
edgeDragHelper.edgeCandidate = edgeCandidate;
if (edgeDragHelper.HandleMouseDown(e))
{
active = true;
target.CaptureMouse();
e.StopPropagation();
}
else
{
edgeDragHelper.Reset();
edgeCandidate = null;
}
}
