port from perforce

intromat/Intromat/Interfaces/IExpressionEditor.cs

@@ -0,0 +1,20 @@
+using Intromat.Nodes.Code;
+using Intromat.ViewModels;
+
+namespace Intromat.Interfaces
+{
+    public interface IExpressionEditor
+    {
+        ERelativeSource RelativeSource
+        {
+            get;
+            set;
+        }
+
+        bool HasParentSource { get; }
+
+        bool HasInputSource { get; }
+
+        CodeGenPortViewModel CodeGenPort { get; }
+    }
+}