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Hot Topic (More than 10 Replies) Multi Selection of nodes. (Read 8098 times)
venki5star
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Multi Selection of nodes.
Apr 15th, 2010 at 9:23am
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Hi,

Is it possible to select multiple nodes by clicking on each node without having the Ctrl key pressed.

Is there any property for that?

Please help.
  
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Stoyo
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Re: Multi Selection of nodes.
Reply #1 - Apr 15th, 2010 at 10:52am
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Hi,

You could set e.Node.Selected in response to the NodeClicked event.

I hope that helps,
Stoyan
  
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venki5star
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Re: Multi Selection of nodes.
Reply #2 - Apr 15th, 2010 at 11:07am
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Hi Stoyan,
This will just select one node.

Assume we have 3 nodes in the diagram, i click on the first node, it gets selected, then if i click on the second node, i want the first node to mainitain its selection as well as the second node also to be selected. Something link pressing the Ctrl key and selecting.

Is it possible?
  
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Stoyo
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Re: Multi Selection of nodes.
Reply #3 - Apr 15th, 2010 at 1:01pm
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Also handle NodeSelecting and set e.Cancel = true to prevent the standard selection change. Then if you set e.Node.Selected from the Clicked event, this should only add to the selection.
  
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venki5star
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Re: Multi Selection of nodes.
Reply #4 - Apr 15th, 2010 at 1:13pm
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Hi,

It doesn't help.

When i tried handling the NodeSelecting event and set e.Cancel = true, i am not even able to select a single node. Its cancelling all the selection.
  
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Re: Multi Selection of nodes.
Reply #5 - Apr 15th, 2010 at 1:23pm
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But you still have to set e.Node.Selected in response to the NodeClicked event. The Selected setter does not raise NodeSelecting and directly adds to the selection.
  
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venki5star
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Re: Multi Selection of nodes.
Reply #6 - Apr 15th, 2010 at 1:48pm
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Yes i did both the things which you wanted me to do, but it doesn't select any node.
  
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Re: Multi Selection of nodes.
Reply #7 - Apr 16th, 2010 at 8:01am
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This works for me:

Code
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private void OnNodeClicked(object sender, NodeEventArgs e)
{
	e.Node.Selected = true;
}

private void OnNodeSelecting(object sender, NodeValidationEventArgs e)
{
	e.Cancel = true;
}


Some problems I can see with it are that you can't unselect nodes by clicking, and you can't select nodes using the selection rectangle. The following fixes these problems:

Code
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private void OnNodeClicked(object sender, NodeEventArgs e)
{
	e.Node.Selected = !e.Node.Selected;
}

private void OnNodeSelecting(object sender, NodeValidationEventArgs e)
{
	if (e.SelectionRectangle.IsEmpty)
		e.Cancel = true;
}


If you can't get it to work, post your diagram initialization code here. Some other event handlers or a specific Behavior type might make selection work differently.

Stoyan
  
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venki5star
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Re: Multi Selection of nodes.
Reply #8 - Apr 16th, 2010 at 11:53am
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It still didn't work. Sad

Here is my initialization code,

<d:Ruler x:Name="diagramRuler">
<d:Diagram x:Name="diagram"
Behavior="DrawLinks"
ShowAnchors="Auto"
AllowDrop="True"
AutoScroll="True"
AllowSelfLoops="False"
AllowLinksRepeat="False"
AutoResize="RightAndDown"
ShowGrid="True"
GridStyle="Points"
LinkHeadShape="Alternative"
LinkHeadShapeSize="8"
LinkBrush="Gray"
AlignToGrid="True"
HorizontalAlignment="Stretch"
/>
</d:Ruler>

I haven't set any property through code behind.
  
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Re: Multi Selection of nodes.
Reply #9 - Apr 19th, 2010 at 9:01am
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It works for me with these settings too. Do you have any event handlers other than NodeClicked and Selecting?
  
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venki5star
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Re: Multi Selection of nodes.
Reply #10 - May 4th, 2010 at 1:19pm
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Yes, i handle lot of events, other than this.

They are,

diagram.Drop += new DragEventHandler(Diagram_Drop);
           diagram.NodeSelected += new NodeEventHandler(diagram_NodeSelected);
           diagram.NodeSelecting += new NodeValidationEventHandler(diagram_NodeSelecting);
           diagram.NodeDeleting += new NodeValidationEventHandler(diagram_NodeDeleting);
           diagram.NodeModifying += new NodeValidationEventHandler(diagram_NodeModifying);
           diagram.NodeModified += new NodeEventHandler(diagram_NodeModified);
           diagram.NodeClicked += new NodeEventHandler(diagram_NodeClicked);
           diagram.Clicked += new DiagramEventHandler(diagram_Clicked);
           diagram.CellClicked += new CellEventHandler(diagram_CellClicked);
           diagram.PreviewKeyDown += new KeyEventHandler(diagram_PreviewKeyDown);
           diagram.SelectionMoving += new ValidationEventHandler(diagram_SelectionMoving);
           diagram.LinkCreated += new LinkEventHandler(diagram_LinkCreated);
           diagram.LinkCreating += new LinkValidationEventHandler(diagram_LinkCreating);
           diagram.LinkClicked += new LinkEventHandler(diagram_LinkClicked);
           diagram.SizeChanged += new SizeChangedEventHandler(diagram_SizeChanged);
  
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Stoyo
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Re: Multi Selection of nodes.
Reply #11 - May 4th, 2010 at 3:29pm
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Please add the event handlers to a test project until the problem is reproduced and email the project to support@mindfusion.eu.

Stoyan
  
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venki5star
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Re: Multi Selection of nodes.
Reply #12 - May 10th, 2010 at 4:57am
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Hi Stoyan,

I have sent a sample project with all the diagram events handled. I am able to reproduce the problem. The sample project might be huge, i have created a region called "Diagram Events" inside Workflowstudio.xaml.cs for your easy reference.
  
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Re: Multi Selection of nodes.
Reply #13 - May 10th, 2010 at 10:14am
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Hi,

How can I add new nodes in you app? From what I can see, multiple-selection by click works for the predefined start and stop nodes created from the constructor. You can't see the startNode handles because its HandlesStyle is set to Custom, but there's no DrawAdjustmentHandles handler to draw the custom handle visuals.

Stoyan
  
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venki5star
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Re: Multi Selection of nodes.
Reply #14 - May 10th, 2010 at 12:08pm
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Hi,

Double click on the 7th and 8th Image from the left hand side tool box, that will create new nodes.
  
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