Relinking connection

GoXam
1

Hi,

I have three nodes say A, B & C with following properties set for their corresponding port:

1)A → LinkableFrom=“True” & LinkableTo=“False”
2)B → LinkableFrom=“False” & LinkableTo=“True”
3)C → LinkableFrom=“True” & LinkableTo=“True”

As seen in the picture Node C is connected to Node B. But when I am relinking connection from B end and points towards A, connection becomes invalid. It makes sense as A is having LinkableTo=“False”. But since the connection is from C to A it is expected to have a valid connection while relinking. So currently its not possible to relink the connection to A. The whole scenario is explained in below pictures also:

image

RelinkIssue(2)

Please advice what changes we need to do, so that it will be valid connection.

Thanks

2

Set both LinkableFrom and LinkableTo attached properties to true.

Override LinkingTool.IsValidLink to return true when you want.

3

We tried above approach, by setting LinkableFrom and LinkableTo to True. Now we are able to connect

image
image763×352 2.43 KB

But how can i reverse the connection direction?.

Thanks

4

If you only want new links to be drawn in the “forwards” direction, set LinkingTool.Direction to LinkingDirection.ForwardsOnly.
http://www.goxam.com/3.0/apiCore/#Northwoods.GoWPF~Northwoods.GoXam.Tool.LinkingTool~Direction.html

5

Direction is part of LinkingTool and it will be set during the creation of a new Link, whereas we are doing Relinking here.

6

You may need to override RelinkingTool.IsValidLink to return false for those situations that you do not want to allow.

7

Scenario here is
1)A → LinkableFrom=“True” & LinkableTo=“False”
2)B → LinkableFrom=“False” & LinkableTo=“True”
3)C → LinkableFrom=“True” & LinkableTo=“True”

Valid connection is created between B and C (refer the first diagram in my initial comments). Then try to relink the connection from B to A (after making LinkableTo and LinkableFrom to True), i am able to connect. Now the issue here is the link direction should change when connection from B to A. (Port in A should be source and the port in C should be destination).

How can i achieve this?.

Thanks

8

Oh, so are you saying that link validity isn’t wrong, but you just want a different result in some relinking cases. I suppose in a Diagram.LinkRelinked event listener you could reverse the link by swapping the Link.FromNode and Link.ToNode. In the link data, not by trying to set those read-only properties.