Hi,

I have two issues:

1. Is there any way to catch a Link GotFocus Event?
I want to do this in order to highlight the link when I pass othe mouse over it and only show the handles when I select the link.

2. I have 2 nodes connected by 1 link, what I want to do is reroute the link from the first node to the another incoming port in the second node but in this way:

Select the first node, start creating a new link from the existing outgoing port, delete the existing link (in order to create the sensation that the link was disconnected from the detination node) and start creating a the new link.

Whenever I start creating the new link (LinkCreating) I remove the existing one but I get the following error:

Null Reference exception:
Object reference not set to an instance of an object.

This is the code:

Private Sub doc_InitializeLink(ByVal sender As Object, ByVal e As MindFusion.Diagramming.LinkEventArgs) Handles doc.InitializeLink

Dim myExistingLink As DiagramLink

If e.Link.Origin.OutgoingLinks.Count > 0 Then
myExistingLink = e.Link.Origin.OutgoingLinks(0)
doc.Items.Remove(myExistingLink)
view.Refresh()
End If
End Sub

I hope someone can give me a hand with this.

Thanks.

Stoyan,

Thanks for your quick answer.

Problem 2 solved ( Visible=False and then delete)

I did what you mention for issue number 1 but the problem is that when I have many links next to each other, when I hover the mouse I get all of them highlighted. Maybe it has to be with the MaxDist parameter ( in order not to get the handles invisible I had to set this parameter to 5)

That's exactly what I'm doing but since there are many links selected at the same time ( and I can't get a collection of them), I only can unselect one of them but the rest remain highlighted.

Stoyan,

This is the situation:

1. The highligt/unhighlight situation is being handle with the MouseMove Even (code below). I just did it with the GetItemAt instead of GetLinkAt because I want to highlight Nodes later (anyway I did it with GetLinkAt but the results are the same).

2. When I hover the mouse over 1 link it gets red and I save a reference of it.

3. Then I move the cursor off the link then it gets gray and it works great.

The problem is when you move the cursor off the link BUT there is another link next to it and then the MouseEvent is triggered again to highlight the new link but not to unhighlight the last one. In this situation you get 2 highlighted links and when you move the cursor again only the last one gets gray but the first one remains red.

Ufff.. that was a long, I hope I made myself clear.

CODE:

Dim myLastHoveredLink As DiagramLink

Private Sub view_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles view.MouseMove

Dim clientPoint As Point = Control.MousePosition
Dim documentPoint As Point = view.PointToClient(clientPoint)
Dim documentPoint2 As PointF = view.ClientToDoc(documentPoint)
Dim hoveredlink As DiagramLink
Dim hoveredNode As DiagramNode

Dim myType As Type
Dim hovereditem As DiagramItem = doc.GetItemAt(documentPoint2, False)


If Not hovereditem Is Nothing Then
myType = hovereditem.GetType()

If myType.Name = "DiagramLink" Then
hoveredlink = hovereditem
view.ModificationStart = ModificationStart.SelectedOnly
hoveredlink.Pen.Color = Color.Red
myLastHoveredLink = hoveredlink
view.Refresh()
End If
Else
If Not myLastHoveredLink Is Nothing Then
myLastHoveredLink.Pen.Color = Color.Gray
view.Refresh()
End If
view.ModificationStart = ModificationStart.AutoHandles
End If

End Sub

Yes, now it works, but if you don't Refresh the DiagramView with Refresh() method after setting the Pen (in both cases),it doesn't work quite well.

Thank you very much.