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Chris M
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Only allow ShapeNodes in ContainerNodes
Jul 26th, 2016 at 6:47pm
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I have a couple of ContainerNodes with some ShapeNodes in them.  I want to be able to drag the ShapeNodes but only allow them to be dropped into ContainerNodes.

I'm trying to use the NodeModifying event along with a LINQ query on my Diagram.Nodes collection but in the debugger the Bounds of a Node are not the actual bounds of the Node.

Is there a better way to do this?
  
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Slavcho
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Re: Only allow ShapeNodes in ContainerNodes
Reply #1 - Jul 26th, 2016 at 6:56pm
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try this -

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private void diagram_NodeModifying(object sender, NodeValidationEventArgs e)
{
	if (e.Node is ShapeNode)
		e.Cancel = !(diagram.GetNodeAt(e.MousePosition, true, true) is ContainerNode);
}


Regards,
Slavcho
Mindfusion
  
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Chris M
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Re: Only allow ShapeNodes in ContainerNodes
Reply #2 - Jul 26th, 2016 at 7:10pm
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You are the man! Works great! Thanks!
  
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Chris M
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Re: Only allow ShapeNodes in ContainerNodes
Reply #3 - Jul 26th, 2016 at 7:57pm
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One more thing.  If I select one or more ShapeNodes, then I am able to drop them outside the ContainerNode..
  
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Chris M
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Re: Only allow ShapeNodes in ContainerNodes
Reply #4 - Jul 26th, 2016 at 8:23pm
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I did this for the SelectionModifying event which seems to work (it's in VB).  If any of the nodes in the selection are moved outside the ContainerNode, the Cancel is set.

Private Sub Diagram_SelectionModifying(sender As Object, e As SelectionValidationEventArgs) Handles Diagram.SelectionModifying

For Each diagramnode As DiagramNode In Diagram.Selection.Nodes
If (TypeOf diagramnode Is ShapeNode) Then
e.Cancel = Not (TypeOf Diagram.GetNodeAt(e.MousePosition, True, True) Is ContainerNode)
End If
Next

End Sub
  
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