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Hot Topic (More than 10 Replies) Diagram.ClearAll() problem (Read 4985 times)
wojto
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Diagram.ClearAll() problem
Jan 25th, 2010 at 4:11pm
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Hi, after clicking a node I want to redraw the diagram. So in NodeSelected event handler I call Diagram.ClearAll(). By doing so I get the following exception:

System.NullReferenceException was unhandled by user code
  Message="Object reference not set to an instance of an object."
  StackTrace:
      at MindFusion.Diagramming.Silverlight.Selection.RemoveItem(DiagramItem item)
      at MindFusion.Diagramming.Silverlight.Selection.xd7c7cf5c5fa6b628(Object xe0292b9ed559da7d, EventArgs xfbf34718e704c6bc)
      at MindFusion.Diagramming.Silverlight.CollectionBase`2.xa9d636b00ff486b7(Boolean x808547253555a9ba)
      at MindFusion.Diagramming.Silverlight.CollectionBase`2.Clear()
      at MindFusion.Diagramming.Silverlight.Selection.x6e950a5680221e52()
      at MindFusion.Diagramming.Silverlight.Diagram.ClearAll()
      at Silverlight.Pages.FlowDiagram.DrawDiagram()
      at Silverlight.Pages.FlowDiagram.SelectNode(DiagramNode node)
      at Silverlight.Pages.FlowDiagram.dgSteps_NodeSelected(Object sender, NodeEventArgs e)
      at MindFusion.Diagramming.Silverlight.Diagram.OnNodeSelected(NodeEventArgs e)
      at MindFusion.Diagramming.Silverlight.Diagram.x687b9b7bc932d66f(DiagramItem xccb63ca5f63dc470)
      at MindFusion.Diagramming.Silverlight.DiagramItem.x5db081b43af662f4(Boolean x8f9d3ffcb9383cde)
      at MindFusion.Diagramming.Silverlight.Selection.xc72e48b5cfcebb45(DiagramItem xccb63ca5f63dc470)
      at MindFusion.Diagramming.Silverlight.Selection.AddItem(DiagramItem item)
      at MindFusion.Diagramming.Silverlight.BehaviorBase.OnMouseUp(MouseButtonEventArgs e)
      at MindFusion.Diagramming.Silverlight.Diagram.x66c89b500bffc63d(Object xe0292b9ed559da7d, MouseButtonEventArgs xfbf34718e704c6bc)
      at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
      at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, String eventName)

When Diagram.ClearAll() is called from some other event (like clicking some button or OnLoad) everything works fine.

Any suggestions?
  
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Stoyo
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Re: Diagram.ClearAll() problem
Reply #1 - Jan 25th, 2010 at 5:53pm
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Hi,

Call ClearAll from the NodeClicked handler.

I hope that helps,
Stoyan
  
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wojto
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Re: Diagram.ClearAll() problem
Reply #2 - Jan 26th, 2010 at 10:06am
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Neither NodeClicked nor CellClicked seem to be raised on my TableNode when I use NodeSelected Smiley Is it that Diagram.ClearAll() cannot be called while handling NodeSelected?
  
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Stoyo
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Re: Diagram.ClearAll() problem
Reply #3 - Jan 26th, 2010 at 10:15am
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ClearAll can't be called from NodeSelected at this time because the latter is called form a loop that iterates over the selection. Do you mean Clicked events are not raised if there are both Selected and Clicked handlers added? This seems to work fine in my test -

private void OnNodeSelected(object sender, NodeEventArgs e)
{
     Debug.WriteLine("selected");
}

private void OnNodeClicked(object sender, NodeEventArgs e)
{
     Debug.WriteLine("clicked");
}

However the control does not raise NodeClicked if there is a CellClicked handler and you click over a cell.
  
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wojto
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Re: Diagram.ClearAll() problem
Reply #4 - Jan 26th, 2010 at 10:23am
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I have a CellDoubleClicked and NodeDoubleClicked (which works only in 1.3 beta) handlers.
  
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Stoyo
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Re: Diagram.ClearAll() problem
Reply #5 - Jan 26th, 2010 at 10:26am
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So you have handlers for Clicked, DoubleClicked and Selected, and in such case the Clicked events are not raised?
  
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wojto
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Re: Diagram.ClearAll() problem
Reply #6 - Jan 27th, 2010 at 2:59pm
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Yes, even if I only have NodeClicked handler, it is still not raised in my diagram with TableNodes. It works only when i click the node, drag the mouse then release the left mouse button - then NodeClicked is raised.
  
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Re: Diagram.ClearAll() problem
Reply #7 - Jan 27th, 2010 at 3:48pm
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Could you copy here your diagram initialization code? Also, are you using the 1.3 released version?

Stoyan
  
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wojto
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Re: Diagram.ClearAll() problem
Reply #8 - Jan 27th, 2010 at 4:09pm
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Nothing special here:

<my:Diagram x:Name="dgSteps" LinkBrush="Green" ShapeBrush="LightSkyBlue"
             AlignToGrid="True" NodeClicked="dgSteps_NodeClicked" >

And then I create node like this:

TableNode rootNode = dgSteps.Factory.CreateTableNode(_bounds);
rootNode.Caption = "root";
rootNode[0, 0].Text = "test";

I use v1.2 because I can't show users "this is 1.3 beta" warning on top of every diagram  Wink
  
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Re: Diagram.ClearAll() problem
Reply #9 - Jan 27th, 2010 at 5:29pm
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Could you try that with V1.3? - we have released it on Monday
http://mindfusion.eu/Forum/YaBB.pl?board=fcnet_news;action=display;num=126441279...

and you can download a licensed version here -
http://clientsarea.eu/
  
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wojto
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Re: Diagram.ClearAll() problem
Reply #10 - Feb 1st, 2010 at 3:10pm
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Yes, ver 1.3 seems to fix that problem. Thanks!
  
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