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shikha_garhewal
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some queries about wpfDiagram
Feb 14th, 2009 at 11:07am
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Hi,

Please suggest on how to achieve following:

1. How to bind collection of items to the wpfDiagram? Is there any sample program available?

2.We want to lock the nodes/links movement

3.How to prevent self-loops and more than one connection/link between the nodes?

4.Is there any kind of support for Transparent/Invisible nodes?

5.Can we dynamically change background color of nodes?








Thanks
« Last Edit: Feb 14th, 2009 at 2:43pm by shikha_garhewal »  
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Stoyo
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Re: some queries about wpfDiagram
Reply #1 - Feb 15th, 2009 at 8:23am
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Hi,

1. Databinding is not supported yet.

2. item.Locked = true (also disables selection) or node.EnabledHandles = None (selection still works).

3. AllowSelfLoops and AllowLinksRepeat.

4. DiagramItem.Visble lets you hide or show items. If ShapeNode.Transparent == true, only the text and image are left visible.

5. Set the Brush property.

I hope that helps,
Stoyan
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #2 - Mar 6th, 2009 at 7:17am
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Hi,

On lock button click we placed following code to lock diagram elements.
foreach (ShapeNode node in diagram.Nodes)
           {
               if (node.EnabledHandles != AdjustmentHandles.None)
               {
                   node.EnabledHandles = AdjustmentHandles.None;
               }
}

but is there any other elegant way to lock/unlock movement of diagram elements.

Thanks,
Anurodh
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #3 - Mar 10th, 2009 at 12:18pm
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Any updates on above.

Also we want that the selection still works in lock mode but the cursor should not be displayed as movement cursor (4 directional arrow) as it may not make sense to present user with movement cursor though the node can not be moved.

the cursor in this case should be default arrow one.

Thanks,
Anurodh
  
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Stoyo
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Re: some queries about wpfDiagram
Reply #4 - Mar 10th, 2009 at 12:41pm
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There are many other ways to do that. For example handle the NodeStartModifying and LinkStartModifying validation events to stop modification of some items, or create a custom BehaviorBase- derived class and assign it to DiagramCustomBehavior.
  
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Re: some queries about wpfDiagram
Reply #5 - Mar 10th, 2009 at 1:07pm
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Thanks for the reply.

Please suggest about cursor thing.

Also we want that the selection still works in lock mode but the cursor should not be displayed as movement cursor (4 directional arrow) as it may not make sense to present user with movement cursor though the node can not be moved. 

the cursor in this case should be default arrow one.

Thanks,
Anurodh
  
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Stoyo
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Re: some queries about wpfDiagram
Reply #6 - Mar 10th, 2009 at 3:31pm
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How exactly have you implemented your locked nodes, are you still using node.EnabledHandles?
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #7 - Mar 12th, 2009 at 5:29am
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Yes,

Initially the node handle style was
node.EnabledHandles = AdjustmentHandles.Move;

then we locked all the nodes movement using:
node.EnabledHandles = AdjustmentHandles.None;

ok, now i got the problem.
As, the movement of the all the nodes are locked then the movement cursor (4 directional arrow) on the node does not make sense. So if you select one node which has AdjustmentHandles.None then it works fine that is we do not get the movement cursor only arrow cursor appears. But the problem comes
when more than one locked nodes are selected then the movement cursor appears and which should not as the nodes are locked and cant be moved.

I think it can be considered as a bug.

Thanks,
Anurodh
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #8 - Mar 16th, 2009 at 1:22pm
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Hi,

Now, i have moved to the NodeStartModifying handling approach, its working fine, but one issue is how to change the cursor, see following code:

Code
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void diagram_NodeStartModifying(object sender, NodeValidationEventArgs e)
	  {
		if (lockNodeMovement)
		{
		    e.CancelDrag();
		    diagram.Cursor = Cursors.Arrow;
		}
		else
		{
		    diagram.Cursor = Cursors.ScrollAll;
		}
	  }


why we are not seeing the cursor changes on diagram. Is dispatcher needed?

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Anurodh
  
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Stoyo
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Re: some queries about wpfDiagram
Reply #9 - Mar 16th, 2009 at 1:32pm
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Hi,

Try setting the Diagram.OverrideCursor property.

I hope that helps,
Stoyan
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #10 - Mar 17th, 2009 at 2:18pm
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Yes, it is now working fine.

But on playing with it i found a new issue when multiple nodes are selected locking does not work for below code

Code
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void diagram_NodeStartModifying(object sender, NodeValidationEventArgs e)
  {
if (lockNodeMovement)
{
    e.CancelDrag();
    diagram.OverrideCursor= Cursors.Arrow;
}
else
{
   diagram.OverrideCursor = null;
}
}


Can you suggest me what to do in order to lock node movement for both single selection and multiple selection.

Thanks,
Anurodh
  
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Stoyo
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Re: some queries about wpfDiagram
Reply #11 - Mar 17th, 2009 at 3:05pm
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Do the same from the SelectionMoving handler.
  
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anurodhora
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Re: some queries about wpfDiagram
Reply #12 - Mar 18th, 2009 at 4:50am
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Thanks working now.
  
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