protected virtual void OnMouseDown(MouseDownEvent e)
{
if (m_Active)
{
e.StopImmediatePropagation();
return;
}
if (!CanStartManipulation(e))
{
return;
}
var port = target.GetFirstAncestorOfType <Port>();
if (port == null)
{
return;
}
m_MouseDownPosition = e.localMousePosition;
m_EdgeDragHelper.CreateEdgeCandidate(port.PortModel.GraphModel);
m_EdgeDragHelper.draggedPort = port.PortModel;
if (m_EdgeDragHelper.HandleMouseDown(e))
{
m_Active = true;
target.CaptureMouse();
e.StopPropagation();
}
else
{
m_EdgeDragHelper.Reset();
}
}
protected void OnMouseMove(MouseMoveEvent evt)
{
// If the left mouse button is not down then return
if (m_Edge == null)
{
return;
}
evt.StopPropagation();
bool alreadyDetached = (m_DetachedPort != null);
// If one end of the edge is not already detached then
if (!alreadyDetached)
{
float delta = (evt.mousePosition - m_PressPos).sqrMagnitude;
if (delta < (s_StartDragDistance * s_StartDragDistance))
{
return;
}
var graphView = m_Edge.GetFirstAncestorOfType <GraphView>();
var outputPortUI = m_Edge.Output.GetUI <Port>(graphView);
var inputPortUI = m_Edge.Input.GetUI <Port>(graphView);
if (outputPortUI == null || inputPortUI == null)
{
return;
}
// Determine which end is the nearest to the mouse position then detach it.
Vector2 outputPos = new Vector2(outputPortUI.GetGlobalCenter().x, outputPortUI.GetGlobalCenter().y);
Vector2 inputPos = new Vector2(inputPortUI.GetGlobalCenter().x, inputPortUI.GetGlobalCenter().y);
float distanceFromOutput = (m_PressPos - outputPos).sqrMagnitude;
float distanceFromInput = (m_PressPos - inputPos).sqrMagnitude;
if (distanceFromInput > 50 * 50 && distanceFromOutput > 50 * 50)
{
return;
}
m_DetachedFromInputPort = distanceFromInput < distanceFromOutput;
IGTFPortModel connectedPort;
Port connectedPortUI;
if (m_DetachedFromInputPort)
{
connectedPort = m_Edge.Output;
connectedPortUI = outputPortUI;
m_DetachedPort = m_Edge.Input;
}
else
{
connectedPort = m_Edge.Input;
connectedPortUI = inputPortUI;
m_DetachedPort = m_Edge.Output;
}
// Use the edge drag helper of the still connected port
m_ConnectedEdgeDragHelper = connectedPortUI.EdgeConnector.edgeDragHelper;
m_ConnectedEdgeDragHelper.originalEdge = m_Edge;
m_ConnectedEdgeDragHelper.draggedPort = connectedPort;
m_ConnectedEdgeDragHelper.CreateEdgeCandidate(connectedPort.GraphModel);
m_ConnectedEdgeDragHelper.edgeCandidateModel.EndPoint = evt.mousePosition;
// Redirect the last mouse down event to active the drag helper
if (m_ConnectedEdgeDragHelper.HandleMouseDown(m_LastMouseDownEvent))
{
m_Active = true;
}
else
{
Reset();
}
m_LastMouseDownEvent = null;
}
if (m_Active)
{
m_ConnectedEdgeDragHelper.HandleMouseMove(evt);
}
}