From 4252cc691261df03889871bebb6a5bb6b1235b14 Mon Sep 17 00:00:00 2001
From: Ankitkumar Satapara <Ankitkumar_Satapara@epam.com>
Date: Mon, 20 Apr 2026 20:59:56 +0530
Subject: [PATCH] Implemented the knot node save load issues

---
 Examples/Nodify.Calculator/GraphSerializer.cs | 29 ++++++++++++++++++-
 .../Models/SaveGraphModel.cs                  |  1 +
 .../Operations/OperationFactory.cs            |  5 ++++
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/Examples/Nodify.Calculator/GraphSerializer.cs b/Examples/Nodify.Calculator/GraphSerializer.cs
index ccdf34a..854ccf6 100644
--- a/Examples/Nodify.Calculator/GraphSerializer.cs
+++ b/Examples/Nodify.Calculator/GraphSerializer.cs
@@ -255,6 +255,9 @@ namespace Nodify.Calculator
                                 info.Output.Add("");
                                 info.IsFlowNode = true;
                                 break;
+                            case SystemOperations.KNOT:
+                                // Knot nodes manage their own connectors; don't add any here
+                                break;
                             default:
                                 info.Output.Add("");
                                 info.IsFlowNode = true;
@@ -414,6 +417,28 @@ namespace Nodify.Calculator
                         op.Output.Add(DeserializeConnector(sc, false));
                     }
                 }
+                else if (sysVm.SystemOperationType == SystemOperations.KNOT)
+                {
+                    // Restore knot connector shape/color/datatype from saved data
+                    if (op is KnotOperationViewModel knotOp)
+                    {
+                        knotOp.Input.Clear();
+                        knotOp.Output.Clear();
+
+                        foreach (var ic in nd.InputConnectors)
+                        {
+                            var conn = DeserializeConnector(ic, true);
+                            conn.IsKnotConnector = true;
+                            knotOp.Input.Add(conn);
+                        }
+                        foreach (var oc in nd.OutputConnectors)
+                        {
+                            var conn = DeserializeConnector(oc, false);
+                            conn.IsKnotConnector = true;
+                            knotOp.Output.Add(conn);
+                        }
+                    }
+                }
             }
         }
 
@@ -426,7 +451,8 @@ namespace Nodify.Calculator
                 ColorArgb = c.RawColor.ToArgb(),
                 DataType = c.DataType ?? string.Empty,
                 IsCopyConnector = c.IsCopyConnector,
-                IsTakeListConnector = c.IsTakeListConnector
+                IsTakeListConnector = c.IsTakeListConnector,
+                IsKnotConnector = c.IsKnotConnector
             };
         }
 
@@ -440,6 +466,7 @@ namespace Nodify.Calculator
                 DataType = cd.DataType,
                 IsCopyConnector = cd.IsCopyConnector,
                 IsTakeListConnector = cd.IsTakeListConnector,
+                IsKnotConnector = cd.IsKnotConnector,
                 IsInput = isInput
             };
         }
diff --git a/Examples/Nodify.Calculator/Models/SaveGraphModel.cs b/Examples/Nodify.Calculator/Models/SaveGraphModel.cs
index 294d142..e21c846 100644
--- a/Examples/Nodify.Calculator/Models/SaveGraphModel.cs
+++ b/Examples/Nodify.Calculator/Models/SaveGraphModel.cs
@@ -53,6 +53,7 @@ namespace Nodify.Calculator.Models
         public string DataType { get; set; } = string.Empty;
         public bool IsCopyConnector { get; set; }
         public bool IsTakeListConnector { get; set; }
+        public bool IsKnotConnector { get; set; }
     }
 
     public class ConnectionData
diff --git a/Examples/Nodify.Calculator/Operations/OperationFactory.cs b/Examples/Nodify.Calculator/Operations/OperationFactory.cs
index e135ede..ac9c1ba 100644
--- a/Examples/Nodify.Calculator/Operations/OperationFactory.cs
+++ b/Examples/Nodify.Calculator/Operations/OperationFactory.cs
@@ -464,6 +464,11 @@ namespace Nodify.Calculator
                         return assertOp;
                     }
 
+                    if (info.sysOp == SystemOperations.KNOT)
+                    {
+                        return new KnotOperationViewModel();
+                    }
+
                     if (info.sysOp == SystemOperations.DEBUG)
                     {
                         var debugOp = new SystemOperationViewModel