Add registerDefaultBehaviors parameter to diagram ctors

Author: zHaytam

src/Blazor.Diagrams.Core/Diagram.cs

@@ -4,9 +4,6 @@
 using Blazor.Diagrams.Core.Layers;
 using Blazor.Diagrams.Core.Models.Base;
 using Blazor.Diagrams.Core.Events;
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.CompilerServices;
 using Blazor.Diagrams.Core.Options;
 using Blazor.Diagrams.Core.Controls;
@@ -38,7 +35,7 @@ public abstract class Diagram
     public event Action? ContainerChanged;
     public event Action? Changed;
 
-    protected Diagram()
+    protected Diagram(bool registerDefaultBehaviors = true)
     {
         _behaviors = new Dictionary<Type, Behavior>();
         _orderedSelectables = new List<SelectableModel>();
@@ -56,6 +53,9 @@ protected Diagram()
         Links.Removed += OnSelectableRemoved;
         Groups.Removed += OnSelectableRemoved;
 
+        if (!registerDefaultBehaviors)
+            return;
+
         RegisterBehavior(new SelectionBehavior(this));
         RegisterBehavior(new DragMovablesBehavior(this));
         RegisterBehavior(new DragNewLinkBehavior(this));

src/Blazor.Diagrams/BlazorDiagram.cs

@@ -1,6 +1,4 @@
-using System;
-using System.Collections.Generic;
-using Blazor.Diagrams.Components.Controls;
+using Blazor.Diagrams.Components.Controls;
 using Blazor.Diagrams.Core;
 using Blazor.Diagrams.Core.Controls.Default;
 using Blazor.Diagrams.Core.Models.Base;
@@ -12,7 +10,7 @@ public class BlazorDiagram : Diagram
 {
     private readonly Dictionary<Type, Type> _componentsMapping;
 
-    public BlazorDiagram(BlazorDiagramOptions? options = null)
+    public BlazorDiagram(BlazorDiagramOptions? options = null, bool registerDefaultBehaviors = true) : base(registerDefaultBehaviors)
     {
         _componentsMapping = new Dictionary<Type, Type>
         {