propagate disabled node boxes across reroute nodes

Source/Editor/Surface/Archetypes/Tools.cs

@@ -1059,7 +1059,10 @@ namespace FlaxEditor.Surface.Archetypes
         internal class RerouteNode : SurfaceNode, IConnectionInstigator
         {
             internal static readonly Float2 DefaultSize = new Float2(FlaxEditor.Surface.Constants.BoxRowHeight);
+            
+            internal bool DrawDisabled => _input.AllConnectionsDisabled || _output.AllConnectionsDisabled;
             internal override bool DrawBasicShadow => false;
+
             private Rectangle _localBounds;
             private InputBox _input;
             private OutputBox _output;
@@ -1165,6 +1168,9 @@ namespace FlaxEditor.Surface.Archetypes
             /// <inheritdoc />
             public override void Draw()
             {
+                // Update active state of input
+                _input.IsActive = !_output.AllConnectionsDisabled;
+
                 var style = Surface.Style;
                 var connectionColor = style.Colors.Default;
                 var type = ScriptType.Null;
@@ -1178,6 +1184,10 @@ namespace FlaxEditor.Surface.Archetypes
                     Surface.Style.GetConnectionColor(type, hints, out connectionColor);
                 }
 
+                // Draw the box as disabled if needed
+                if (DrawDisabled)
+                    connectionColor = connectionColor * 0.6f;
+
                 if (!_input.HasAnyConnection)
                     Render2D.FillRectangle(new Rectangle(-barHorizontalOffset - barHeight * 2, (DefaultSize.Y - barHeight) / 2, barHeight * 2, barHeight), connectionColor);
                 if (!_output.HasAnyConnection)

Source/Editor/Surface/Elements/Box.cs

@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using FlaxEditor.Scripting;
 using FlaxEditor.Surface.Undo;
 using FlaxEngine;
@@ -194,6 +195,16 @@ namespace FlaxEditor.Surface.Elements
             set => _isActive = value;
         }
 
+        /// <summary>
+        /// Gets if the box is disabled (user can still connect, but connections will be ignored).
+        /// </summary>
+        public bool IsDisabled => !(Enabled && IsActive);
+
+        /// <summary>
+        /// Gets a value indicating whether all connections are disabled.
+        /// </summary>
+        public bool AllConnectionsDisabled => Connections.All(c => c.IsDisabled);
+
         /// <inheritdoc />
         protected Box(SurfaceNode parentNode, NodeElementArchetype archetype, Float2 location)
         : base(parentNode, archetype, location, new Float2(Constants.BoxRowHeight), false)

Source/Editor/Surface/Elements/OutputBox.cs

@@ -190,7 +190,7 @@ namespace FlaxEditor.Surface.Elements
                 Box targetBox = Connections[i];
                 var endPos = targetBox.ConnectionOrigin;
                 var highlight = DefaultConnectionThickness + Mathf.Max(startHighlight, targetBox.ConnectionsHighlightIntensity);
-                var alpha = targetBox.Enabled && targetBox.IsActive ? 1.0f : 0.6f;
+                var alpha = targetBox.IsDisabled ? 0.6f : 1.0f;
 
                 // We have to calculate an offset here to preserve the original color for when the default connection thickness is larger than 1
                 var highlightOffset = (highlight - (DefaultConnectionThickness - 1));
@@ -216,7 +216,7 @@ namespace FlaxEditor.Surface.Elements
             // Draw all the connections
             var startPos = ConnectionOrigin;
             var endPos = targetBox.ConnectionOrigin;
-            var alpha = targetBox.Enabled && targetBox.IsActive ? 1.0f : 0.6f;
+            var alpha = targetBox.IsDisabled ? 0.6f : 1.0f;
             var color = _currentTypeColor * alpha;
             DrawConnection(Surface.Style, ref startPos, ref endPos, ref color, SelectedConnectionThickness);
         }

Source/Editor/Surface/SurfaceStyle.cs

@@ -233,7 +233,7 @@ namespace FlaxEditor.Surface
 
             // Draw icon
             bool hasConnections = box.HasAnyConnection;
-            float alpha = box.Enabled && box.IsActive ? 1.0f : 0.6f;
+            float alpha = box.IsDisabled ? 0.6f : 1.0f;
             Color color = box.CurrentTypeColor * alpha;
             var style = box.Surface.Style;
             SpriteHandle icon;