How to create custom errors when [RequiredField] is not enough?

[Deadcow]

I made a custom type with an ObjectDrawer to serialize references in the scene and want to add the error sign if the referenced object is not accessible anymore.
I found a way to toggle it via task.NodeData.NodeDesigner.HasError, but it does not much sense when accessible from ObjectDrawer's OnGUI, I need the error check to happen without Action selection.

I found no way to error check in custom Action either. And no suitable callbacks for the error-check phase also.
Maybe there is a way that I wasn't able to find?

 

[Justin]

There aren't any error check callbacks. Could you check it within the task constructor? This won't require the editor.

 

[Deadcow]

In my SetTarget action, I tried to access NodeDesigner, but it was null during construction and after a short delay.
I tried to do it like this:

#if UNITY_EDITOR
public SetTarget()
{
   UnityEditor.EditorApplication.delayCall += () 
     => ((BehaviorDesigner.Editor.NodeDesigner)NodeData.NodeDesigner).HasError = true;
}
#endif

How could I create or initialize the NodeDesigner properly?

 

[Justin]

The NodeDesigner object is only initialized when the behavior tree is loaded in the editor. The error checker is editor only, if it doesn't exist you could output a LogError message.

 

[Deadcow]

I figured out, that NodeDesigner is initialized 2 frames after the Task constructor (if it is created when Behavior Designer is displaying it, of course).
That's why it is still not set after the first "delayedCall". With a continuous check, I was able to achieve dynamic error-checking
In case anyone would look for a solution, here it is.

Currently trying to find the way to reliably add error data in ErrorDetails of BehaviorDesignerWindow