Merge pull request #19 from WiseTechGlobal/AN9/WI00692027/NCN-BufferN…

…ode-Relationship-implementation

An9/wi00692027/ncn-Introduced Enabled property to handle the dragNewLinkBehaviour

src/Blazor.Diagrams.Core/Behaviors/DragNewLinkBehavior.cs

@@ -56,7 +56,7 @@ private void OnPointerDown(Model? model, MouseEventArgs e)
 
         if (model is PortModel port)
         {
-            if (port.Locked)
+            if (port.Locked || !port.Enabled)
                 return;
 
             _targetPositionAnchor = new PositionAnchor(CalculateTargetPosition(e.ClientX, e.ClientY));

src/Blazor.Diagrams.Core/Models/Base/Model.cs

@@ -18,6 +18,7 @@ protected Model(string id)
 
     public string Id { get; }
     public bool Locked { get; set; }
+    public bool Enabled { get; set; } = true;
     public bool Visible
     {
         get => _visible;

tests/Blazor.Diagrams.Core.Tests/Behaviors/DragNewLinkBehaviorTests.cs

@@ -441,4 +441,27 @@ public void Behavior_ShouldTriggerLinkTargetAttached_WhenLinkSnappedToPortAndMou
         // Assert
         targetAttachedTriggers.Should().Be(1);
     }
+
+    [Fact]
+    public void Behavior_ShouldNotCreateLinkWithSinglePortAnchorSource_WhenMouseDownOnPort()
+    {
+        // Arrange
+        var diagram = new TestDiagram();
+        diagram.SetContainer(new Rectangle(0, 0, 1000, 400));
+        var node = new NodeModel(position: new Point(100, 50));
+        var port = node.AddPort(new PortModel(node)
+        {
+            Initialized = true,
+            Position = new Point(110, 60),
+            Size = new Size(10, 20),
+            Enabled = false
+        });
+
+        // Act
+        diagram.TriggerPointerDown(port,
+            new PointerEventArgs(100, 100, 0, 0, false, false, false, 0, 0, 0, 0, 0, 0, string.Empty, true));
+
+        // Assert
+        diagram.Links.Count.Should().Be(0);
+    }
 }