ContainerNode.UpdateBounds() and Sub-Groups - Diagramming Components

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ContainerNode.UpdateBounds() and Sub-Groups (Read 2966 times)

mihai Junior Member Offline Posts: 86 Joined: Jul 29^th, 2009	ContainerNode.UpdateBounds() and Sub-Groups Aug 27^th, 2009 at 7:29am	Print Post
	Hi, Say I have the following diagram: - ContainerNode A; - DiagramNode B contained in A; - DiagramNode C attached to B, with C.MasterGroup.AutoDeleteItems = true; If I delete node B and have this in place: Code void diagram_NodeDeleted(object sender, NodeEventArgs e) { A.UpdateBounds(); } then UpdateBounds() will throw a NullReferenceException as the sub-group has not yet been fully removed - at least that's my take. Any idea how to overcome this? Thanks, -Mihai
	« Last Edit: Aug 27^th, 2009 at 11:12am by mihai »

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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: ContainerNode.UpdateBounds() and Sub-Groups Reply #1 - Aug 27^th, 2009 at 10:44am	Print Post
	Hi, Are you calling directly A.UpdateBounds(), or that's a placeholder for some code that looks for the container through e.Node.MasterGroup? Stoyan


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mihai Junior Member Offline Posts: 86 Joined: Jul 29^th, 2009	Re: ContainerNode.UpdateBounds() and Sub-Groups Reply #2 - Aug 27^th, 2009 at 11:12am	Print Post
	Hi Stoyan, Yes, I'm calling it directly (I store the reference to "A" as a class member). Thanks, -Mihai


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: ContainerNode.UpdateBounds() and Sub-Groups Reply #3 - Sep 5^th, 2009 at 2:03pm	Print Post
	Hi Mihai, Yes, the problem seems to happen because NodeDeleted is raised before the nodes are removed from the container, and the actual exception occurs when it is raised for the C node, while the removal method for B hasn't completed. Try handling it like this: Code private void diagram_NodeDeleted(object sender, NodeEventArgs e) { if (ContainerNode.GetContainer(e.Node) == A) { A.Remove(e.Node); A.UpdateBounds(); } } I hope that helps, Stoyan


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mihai Junior Member Offline Posts: 86 Joined: Jul 29^th, 2009	Re: ContainerNode.UpdateBounds() and Sub-Groups Reply #4 - Sep 7^th, 2009 at 9:07am	Print Post
	Hi Stoyan, Thanks, that did the trick! Talk to you soon, -Mihai


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