Improved userfriendlyness of [Input] and [Output]

Example/Nodes/DisplayValue.cs

@@ -1,6 +1,6 @@
 using UnityEngine;
 
 public class DisplayValue : ExampleNodeBase {
-    [Input(false)] public float value;
+    [Input] public float value;
 
 }

Example/Nodes/MathNode.cs

@@ -2,9 +2,9 @@
 
 [System.Serializable]
 public class MathNode : ExampleNodeBase {
-    [Input(true)] public float a;
+    [Input] public float a;
-    [Input(true)] public float b;
+    [Input] public float b;
-    [Output(false)] public float result;
+    [Output] public float result;
     public enum MathType { Add, Subtract, Multiply, Divide}
     public MathType mathType = MathType.Add;
 

Example/Nodes/TestNode.cs

@@ -5,14 +5,14 @@ using UnityEngine;
 public class TestNode : Node {
 
 	public int myInt;
-	[Input(false)] public float myFloat;
+	[Input] public float myFloat;
 	public double myDouble;
 	public long myLong;
 	public bool myBool;
-	[Input(true)] public string myString;
+	[Input] public string myString;
 	public Rect myRect;
-	[Input(true)] public Vector2 myVec2;
+	[Input] public Vector2 myVec2;
-	[Input(true)] public Vector3 myVec3;
+	[Input] public Vector3 myVec3;
 	public Vector4 myVec4;
 	public Color myColor;
 	public AnimationCurve myCurve;

Scripts/Editor/NodeEditor.cs

@@ -31,7 +31,6 @@ public class NodeEditor {
         EditorGUI.BeginChangeCheck();
         FieldInfo[] fields = GetInspectorFields(target);
         for (int i = 0; i < fields.Length; i++) {
-            object[] fieldAttribs = fields[i].GetCustomAttributes(false);
             if (fields[i].Name == "graph" || fields[i].Name == "position") continue;
             NodeEditorGUILayout.PropertyField(target, fields[i], portPositions);
         }

Scripts/Editor/NodeEditorGUI.cs

@@ -108,10 +108,7 @@ public partial class NodeEditorWindow {
         if (startPoint.x > endPoint.x) endTangent.x = Mathf.LerpUnclamped(endPoint.x, startPoint.x, -0.7f);
         else endTangent.x = Mathf.LerpUnclamped(endPoint.x, startPoint.x, 0.7f);
 
-        Color prevCol = GUI.color;
-        Color edgeCol = new Color(0.1f, 0.1f, 0.1f, col.a);
         Handles.DrawBezier(startPoint, endPoint, startTangent, endTangent, col, null, 4);
-        GUI.color = prevCol;
     }
 
     /// <summary> Draws all connections </summary>

Scripts/Editor/NodeEditorGUILayout.cs

@@ -50,12 +50,13 @@ public class NodeEditorGUILayout {
         if (NodeEditorUtilities.GetAttrib(fieldAttribs, out inputAttrib)) {
             NodePort port = target.GetPortByFieldName(fieldName);
             Vector2 portPos;
-            fieldValue = PortField(fieldPrettyName, fieldValue, fieldType, port, inputAttrib.fallback, out portPos);
+            bool fallback = inputAttrib.backingValue == Node.ShowBackingValue.Always || (inputAttrib.backingValue == Node.ShowBackingValue.Unconnected && !port.IsConnected);
+            fieldValue = PortField(fieldPrettyName, fieldValue, fieldType, port, fallback, out portPos);
             portPositions.Add(port, portPos);
         } else if (NodeEditorUtilities.GetAttrib(fieldAttribs, out outputAttrib)) {
             NodePort port = target.GetPortByFieldName(fieldName);
             Vector2 portPos;
-            fieldValue = PortField(fieldPrettyName, fieldValue, fieldType, port, outputAttrib.fallback, out portPos);
+            fieldValue = PortField(fieldPrettyName, fieldValue, fieldType, port, false, out portPos);
             portPositions.Add(port, portPos);
         } else {
             fieldValue = PropertyField(fieldPrettyName, fieldValue, fieldType);

Scripts/Node.cs

@@ -7,7 +7,14 @@ using UnityEngine;
 /// <summary> Base class for all nodes </summary>
 [Serializable]
 public abstract class Node : ScriptableObject {
-    public enum ShowBackingValue { Never, Unconnected, Always }
+    public enum ShowBackingValue {
+        /// <summary> Never show the backing value </summary>
+        Never,
+        /// <summary> Show the backing value only when the port does not have any active connections </summary>
+        Unconnected,
+        /// <summary> Always show the backing value </summary>
+        Always
+    }
 
     /// <summary> Name of the node </summary>
     [SerializeField] public NodeGraph graph;
@@ -21,7 +28,7 @@ public abstract class Node : ScriptableObject {
     public int OutputCount { get { return outputs.Count; } }
 
     protected void OnEnable() {
-        GetPorts();
+        NodeDataCache.UpdatePorts(this, inputs, outputs);
         Init();
     }
 
@@ -98,19 +105,20 @@ public abstract class Node : ScriptableObject {
         return JsonUtility.ToJson(this).GetHashCode();
     }
 
+    /// <summary> Mark a serializable field as an input port. You can access this through <see cref="GetInputByFieldName(string)"/> </summary>
     [AttributeUsage(AttributeTargets.Field, AllowMultiple = true)]
     public class InputAttribute : Attribute {
         public ShowBackingValue backingValue;
+        
+        /// <summary> Mark a serializable field as an input port. You can access this through <see cref="GetInputByFieldName(string)"/> </summary>
+        /// <param name="backingValue">Should we display the backing value for this port as an editor field? </param>
         public InputAttribute(ShowBackingValue backingValue = ShowBackingValue.Unconnected) { this.backingValue = backingValue; }
     }
 
+    /// <summary> Mark a serializable field as an output port. You can access this through <see cref="GetOutputByFieldName(string)"/> </summary>
     [AttributeUsage(AttributeTargets.Field, AllowMultiple = true)]
     public class OutputAttribute : Attribute {
-        public bool fallback;
+        /// <summary> Mark a serializable field as an output port. You can access this through <see cref="GetOutputByFieldName(string)"/> </summary>
-        public OutputAttribute(bool fallback) { this.fallback = fallback; }
+        public OutputAttribute() { }
-    }
-
-    private void GetPorts() {
-        NodeDataCache.UpdatePorts(this, inputs, outputs);
     }
 }