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Normal Topic Drag Beyond Bounds (Read 2898 times)
dolfandon
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Drag Beyond Bounds
Aug 11th, 2011 at 6:59pm
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We noticed in our app that you can now drag the nodes beyond the bounds at the top and left of the diagram. This didn't happen before in earlier versions. I'm not sure if this is an interaction with a Silverlight update or the latest version of the 3.5 diagram control. Is this a way to turn that off or limit it?
  
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Meppy
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Re: Drag Beyond Bounds
Reply #1 - Aug 12th, 2011 at 6:43am
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I can't think of the reason for this to happen, but you can easily prevent it by handling the Diagram.NodeModifying event and using the following code in the event handler:

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if (e.Node.Bounds.X < diagram.Bounds.Left ||
      e.Node.Bounds.Y < diagram.Bounds.Top)
{
      e.Cancel = true;
}

I hope this helps.

Regards,
Meppy
  
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dolfandon
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Re: Drag Beyond Bounds
Reply #2 - Aug 12th, 2011 at 3:40pm
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Thanks, that seems to work fine although I modified it a little so that it doesn't actually drag the node outside the bounds. Any hints how I would do this for a link anchor point. I looked at link modifying but can't find anything that gives me the position of the anchor point as it is being dragged. By the way. This happens in all the demos on the site.

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            if (e.Node.Bounds.X < currentDiagram.Bounds.Left || e.Node.Bounds.Y < currentDiagram.Bounds.Top)
            {
                if (e.Node.Bounds.X < currentDiagram.Bounds.Left)
                {
                    e.Node.Bounds = new Rect( currentDiagram.Bounds.Left, e.Node.Bounds.Y, e.Node.Bounds.Width, e.Node.Bounds.Height);
                }
                if (e.Node.Bounds.Y < currentDiagram.Bounds.Top)
                {
                    e.Node.Bounds = new Rect(e.Node.Bounds.X, currentDiagram.Bounds.Top, e.Node.Bounds.Width, e.Node.Bounds.Height);
                }
                e.Cancel = true;
            }
  
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Meppy
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Re: Drag Beyond Bounds
Reply #3 - Aug 13th, 2011 at 10:16am
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Handle the LinkModifying event. You can access the coordinates of the point being dragged through the folowing line:

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Point point = e.Link.ControlPoints[e.AdjustmentHandle];

Make sure to invoke Link.UpdateFromPoints after manually modifying the points of the link.

Regards,
Meppy
  
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