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Question by Synid · Jul 19, 2020 at 07:59 PM · editoreventsgraphedgenode

How can I detect changes to GraphView, Nodes and Edges?

Hey!

I'm building a dialogue editing system using GraphView, and I'm trying to make it save any changes automatically. To do this I need to detect a bunch of situations, and save in response to them:

Situations I've been able to catch:
- A node has been added (I'm explicitly adding it in code, so that's easy)
- A node has been deleted (Using DetachFromPanelEvent)

Situations I'm unable to catch:
- A node has been moved (dragged).
- An Edge has been added.
- An Edge has been deleted.

Any tips or info on how I could achieve detecting those is greatly appreciated. I really don't want to downgrade to a manual saving system as that risks having a lot of work going unsaved by mistake.

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Answer by muckenhoupt · Sep 25, 2020 at 07:54 AM

You've probably figured this out already, but for the sake of other people searching for answers on this forum: The key to all this is the GraphView.graphViewChanged callback. You want to do something like:

     MyGraphView() {
         graphViewChanged = OnGraphChange;
     }
 
     private GraphViewChange OnGraphChange(GraphViewChange change)
     {
         if (change.edgesToCreate != null) {
             foreach (Edge edge in change.edgesToCreate)
             {
                 ...
             }
         }
 
         if (change.elementsToRemove != null)
         {
             foreach (GraphElement e in change.elementsToRemove)
             {
                 if (e.GetType() == typeof(Edge) {
                     ...
                 }
             }
         }
 
         if (change.movedElements != null)
         {
             foreach (GraphElement e in change.movedElements)
             {
                 if (e.GetType() == typeof(Node))
                 {
                     ...
                 }
             }
         }
 
         return change;
     }
 
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avatar image Synid · Jan 02 at 02:31 AM 0
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I changed my solution to something else, but this will be very helpful in the future. Thank you!

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