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Normal Topic How to detect DiagramLink disconnect (Read 2913 times)
stefski
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How to detect DiagramLink disconnect
Aug 30th, 2010 at 10:44am
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Hello,

I am struggling somewhat to figure out how to detect when a DiagramLink has been disconnected from a DiagramNode.

Basically I would expect to get information about the link, endpoint (Origin or Destination) and node involved in the disconnect.

I have tried handling (among others) the LinkModified and DestinationAnchorChanged events, but they either don't fire often enough or provide too little information.

Suggestions are very welcome!


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Steffen Skov
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SPTGroup AS
  
Kind regards

Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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Stoyo
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Re: How to detect DiagramLink disconnect
Reply #1 - Aug 30th, 2010 at 1:47pm
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Hi,

If you need to know when a link is no longer connected to a node, handling LinkModified should be enough:

Code
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private void diagram_LinkModified(object sender, LinkEventArgs e)
{
	if (e.AdjustmentHandle == 0 && e.Link.Origin is DummyNode)
		Debug.WriteLine("disconnected origin");
	if (e.AdjustmentHandle == e.Link.ControlPoints.Count - 1 && e.Link.Destination is DummyNode)
		Debug.WriteLine("disconnected destination");
}


Unfortunately the event arguments do not include a reference to the origin or destination before disconnecting. If you need that, you can save reference to the respective node from a LinkStartModifying handler.

I hope that helps,
Stoyan
  
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stefski
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Re: How to detect DiagramLink disconnect
Reply #2 - Sep 1st, 2010 at 8:07am
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Thank you, Stoyan!

I solved the problem by adding some state to my event handling class, which would then be able to fire my own events on connecting and disconnecting.


Best regards

Steffen Skov
principal consultant
SPTGroup AS
  
Kind regards

Steffen Skov
OLGA Application Architect
Schlumberger Information Solutions AS
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