- Implemented function node and bind/unbind node compatiblility/filtering

- Added NodeTypeHint enum

Source/Editor/Surface/Archetypes/Function.cs

@@ -2228,6 +2228,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Title = "Function Input",
                 Description = "The graph function input data",
                 Flags = NodeFlags.MaterialGraph | NodeFlags.ParticleEmitterGraph | NodeFlags.AnimGraph | NodeFlags.NoSpawnViaPaste,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2247,6 +2248,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Title = "Function Output",
                 Description = "The graph function output data",
                 Flags = NodeFlags.MaterialGraph | NodeFlags.ParticleEmitterGraph | NodeFlags.AnimGraph | NodeFlags.NoSpawnViaPaste,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2265,6 +2267,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Title = string.Empty,
                 Description = "Overrides the base class method with custom implementation",
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI | NodeFlags.NoSpawnViaPaste,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2279,6 +2282,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new InvokeMethodNode(id, context, arch, groupArch),
                 Title = string.Empty,
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2302,6 +2306,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new ReturnNode(id, context, arch, groupArch),
                 Title = "Return",
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(100, 40),
                 DefaultValues = new object[]
                 {
@@ -2320,6 +2325,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Title = "New Function",
                 Description = "Adds a new function to the script",
                 Flags = NodeFlags.VisualScriptGraph,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 20),
                 DefaultValues = new object[]
                 {
@@ -2332,6 +2338,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new GetFieldNode(id, context, arch, groupArch),
                 Title = string.Empty,
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2347,6 +2354,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new SetFieldNode(id, context, arch, groupArch),
                 Title = string.Empty,
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(240, 60),
                 DefaultValues = new object[]
                 {
@@ -2363,6 +2371,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new BindEventNode(id, context, arch, groupArch),
                 Title = string.Empty,
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(260, 60),
                 DefaultValues = new object[]
                 {
@@ -2385,6 +2394,7 @@ namespace FlaxEditor.Surface.Archetypes
                 Create = (id, context, arch, groupArch) => new UnbindEventNode(id, context, arch, groupArch),
                 Title = string.Empty,
                 Flags = NodeFlags.VisualScriptGraph | NodeFlags.NoSpawnViaGUI,
+                NodeTypeHint = NodeTypeHint.FunctionNode,
                 Size = new Float2(260, 60),
                 DefaultValues = new object[]
                 {

Source/Editor/Surface/ContextMenu/VisjectCMItem.cs

@@ -3,11 +3,13 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Reflection;
 using FlaxEditor.Scripting;
 using FlaxEditor.Surface.Elements;
 using FlaxEditor.Utilities;
 using FlaxEngine;
 using FlaxEngine.GUI;
+using FlaxEngine.Utilities;
 
 namespace FlaxEditor.Surface.ContextMenu
 {
@@ -121,13 +123,70 @@ namespace FlaxEditor.Surface.ContextMenu
                 Visible = true;
                 return true;   
             }
-            
+
-            if (_archetype?.Elements == null)
+            if (_archetype == null)
             {
                 Visible = false;
                 return false;
             }
-            
+
+            bool isCompatible = false;
+            if (_archetype.Elements != null)
+            {
+                isCompatible = CheckElementsCompatibility(startBox);
+            }
+
+            if (_archetype.NodeTypeHint == NodeTypeHint.FunctionNode)
+            {
+                isCompatible = false;
+                ScriptMemberInfo memberInfo = ScriptMemberInfo.Null;
+
+                if (_archetype.Tag is ScriptMemberInfo info)
+                {
+                    memberInfo = info;
+                }
+                else if(_archetype.DefaultValues is { Length: > 1 })
+                {
+                    var eventName = (string)_archetype.DefaultValues[1];
+                    var eventType = TypeUtils.GetType((string)_archetype.DefaultValues[0]);
+                    memberInfo = eventType.GetMember(eventName, MemberTypes.Event, BindingFlags.Public | BindingFlags.Static | BindingFlags.Instance);
+                }
+
+                if (memberInfo != ScriptMemberInfo.Null)
+                {
+                    if (startBox.IsOutput)
+                    {
+                        var parameters = memberInfo.GetParameters();
+                        ScriptType outType = startBox.CurrentType;
+
+                        if (!memberInfo.IsStatic)
+                        {
+                            var scriptType = TypeUtils.GetType((string)_archetype.DefaultValues[0]);
+                            isCompatible |= CanCastToType(scriptType, outType, _archetype.ConnectionsHints);
+                        }
+
+                        if (!memberInfo.IsEvent)
+                        {
+                            for (int i = 0; i < parameters.Length; i++)
+                            {
+                                ScriptType inType = parameters[i].Type;
+                                isCompatible |= CanCastToType(inType, outType, _archetype.ConnectionsHints);
+                            }
+                        }
+                    }
+                    else
+                    {
+
+                    }
+                }
+            }
+
+            Visible = isCompatible;
+            return isCompatible;
+        }
+
+        private bool CheckElementsCompatibility(Box startBox)
+        {
             bool isCompatible = false;
             foreach (NodeElementArchetype element in _archetype.Elements)
             {
@@ -153,15 +212,12 @@ namespace FlaxEditor.Surface.ContextMenu
                     hint = startBox.ParentNode.Archetype.ConnectionsHints;
                 }
                 
-                bool checkCompatibility = CanCastToType(inType, outType, hint);
+                isCompatible |= CanCastToType(inType, outType, hint);
-                isCompatible |= checkCompatibility;
             }
-            
+
-            Visible = isCompatible;
-            
             return isCompatible;
         }
-
+        
         private bool CanCastToType(ScriptType currentType, ScriptType type, ConnectionsHint hint)
         {
             if (VisjectSurface.CanUseDirectCastStatic(type, currentType, false))

Source/Editor/Surface/NodeArchetype.cs

@@ -73,6 +73,20 @@ namespace FlaxEditor.Surface
         All = Scalar | Vector | Enum | Anything | Value | Array | Dictionary,
     }
 
+    [HideInEditor]
+    public enum NodeTypeHint
+    {
+        /// <summary>
+        /// Is Node.
+        /// </summary>
+        Default = 0,
+        
+        /// <summary>
+        /// Is Function Node.
+        /// </summary>
+        FunctionNode = 1,
+    }
+    
     /// <summary>
     /// Surface node archetype description.
     /// </summary>
@@ -152,6 +166,11 @@ namespace FlaxEditor.Surface
         /// </summary>
         public ConnectionsHint ConnectionsHints;
 
+        /// <summary>
+        /// Node Type hints.
+        /// </summary>
+        public NodeTypeHint NodeTypeHint;
+        
         /// <summary>
         /// Array with independent boxes IDs.
         /// </summary>
@@ -193,6 +212,7 @@ namespace FlaxEditor.Surface
                 DefaultValues = (object[])DefaultValues?.Clone(),
                 DefaultType = DefaultType,
                 ConnectionsHints = ConnectionsHints,
+                NodeTypeHint = NodeTypeHint,
                 IndependentBoxes = (int[])IndependentBoxes?.Clone(),
                 DependentBoxes = (int[])DependentBoxes?.Clone(),
                 Elements = (NodeElementArchetype[])Elements?.Clone(),

Source/Editor/Surface/VisualScriptSurface.cs

@@ -370,7 +370,7 @@ namespace FlaxEditor.Surface
                                 bindNode.Description = SurfaceUtils.GetVisualScriptMemberInfoDescription(member);
                                 bindNode.SubTitle = string.Format(" (in {0})", scriptTypeName);
                                 ((IList<NodeArchetype>)group.Archetypes).Add(bindNode);
-
+                                
                                 // Add Unbind event node
                                 var unbindNode = (NodeArchetype)Archetypes.Function.Nodes[9].Clone();
                                 unbindNode.DefaultValues[0] = scriptTypeTypeName;
@@ -589,6 +589,7 @@ namespace FlaxEditor.Surface
                         node.DefaultValues[0] = name;
                         node.DefaultValues[1] = parameters.Length;
                         node.Title = "Override " + name;
+                        node.Tag = member;
                         nodes.Add(node);
                     }
                 }