perf: regular events to custom events

Engine.Core/Abstract/Assignable/IAssignable.cs

@@ -8,7 +8,7 @@ public interface IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IAssignable"/>'s fields are unassigned and completely ready to recycle.
     /// </summary> 
-    event UnassignEventHandler? OnUnassigned;
+    Event<IAssignable>? OnUnassigned { get; }
 
     /// <summary>
     /// Unassign <see cref="IAssignable"/>'s all fields and make it ready to recycle.

Engine.Core/Abstract/Assignable/IHasBehaviourController.cs

@@ -8,7 +8,7 @@ public interface IHasBehaviourController : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IBehaviourController"/> value has has been assigned a new value.
     /// </summary>
-    event BehaviourControllerAssignedEventHandler? OnBehaviourControllerAssigned;
+    Event<IHasBehaviourController> OnBehaviourControllerAssigned { get; }
 
     /// <inheritdoc cref="IBehaviourController" />
     IBehaviourController BehaviourController { get; }

Engine.Core/Abstract/Assignable/IHasEntity.cs

@@ -8,7 +8,7 @@ public interface IHasEntity : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IEntity"/> value has has been assigned a new value.
     /// </summary>
-    event EntityAssignedEventHandler? OnEntityAssigned;
+    Event<IHasEntity> OnEntityAssigned { get; }
 
     /// <inheritdoc cref="IEntity" />
     IEntity Entity { get; }

Engine.Core/Abstract/Assignable/IHasStateEnable.cs

@@ -8,7 +8,7 @@ public interface IHasStateEnable : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IStateEnable"/> value has has been assigned a new value.
     /// </summary>
-    event StateEnableAssignedEventHandler? OnStateEnableAssigned;
+    Event<IHasStateEnable> OnStateEnableAssigned { get; }
 
     /// <inheritdoc cref="IStateEnable" />
     IStateEnable StateEnable { get; }

Engine.Core/Abstract/Assignable/IHasUniverse.cs

@@ -8,7 +8,7 @@ public interface IHasUniverse : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IUniverse"/> value has has been assigned a new value.
     /// </summary>
-    event UniverseAssignedEventHandler? OnUniverseAssigned;
+    Event<IHasUniverse> OnUniverseAssigned { get; }
 
     /// <inheritdoc cref="IUniverse" />
     IUniverse Universe { get; }

Engine.Core/Abstract/Assignable/IHasUniverseObject.cs

@@ -8,7 +8,7 @@ public interface IHasUniverseObject : IAssignable
     /// <summary>
     /// Event triggered when the <see cref="IUniverseObject"/> value has has been assigned a new value.
     /// </summary>
-    event UniverseObjectAssignedEventHandler? OnUniverseObjectAssigned;
+    Event<IHasUniverseObject> OnUniverseObjectAssigned { get; }
 
     /// <inheritdoc cref="IUniverseObject" />
     IUniverseObject UniverseObject { get; }

Engine.Core/Abstract/IActive.cs

@@ -8,7 +8,7 @@ public interface IActive
     /// <summary>
     /// Event triggered when the <see cref="IsActive"/> state of the <see cref="IActive"/> changes.
     /// </summary>
-    event ActiveChangedEventHandler? OnActiveChanged;
+    Event<IActive, bool> OnActiveChanged { get; }
 
     /// <summary>
     /// The value indicating whether the <see cref="IActive"/> is enabled.

Engine.Core/Abstract/IBehaviour.cs

@@ -8,7 +8,7 @@ public interface IBehaviour : IEntity, IActive, IHasBehaviourController, IHasSta
     /// <summary>
     /// Event triggered when the priority of the <see cref="IBehaviour"/> changes.
     /// </summary>
-    event PriorityChangedEventHandler? OnPriorityChanged;
+    Event<IBehaviour, int> OnPriorityChanged { get; }
 
     /// <summary>
     /// The priority of the <see cref="IBehaviour"/>.

Engine.Core/Abstract/IBehaviourCollector.cs

@@ -10,12 +10,12 @@ public interface IBehaviourCollector<T> : IHasUniverse where T : class
     /// <summary>
     /// Event triggered when an object of type <typeparamref name="T"/> is added to the collector.
     /// </summary>
-    event CollectedEventHandler? OnCollected;
+    Event<IBehaviourCollector<T>, T> OnCollected { get; }
 
     /// <summary>
     /// Event triggered when an object of type <typeparamref name="T"/> is removed from the collector.
     /// </summary>
-    event RemovedEventHandler? OnRemoved;
+    Event<IBehaviourCollector<T>, T> OnRemoved { get; }
 
     /// <summary>
     /// Amount of <typeparamref name="T"/> collected.

Engine.Core/Abstract/IBehaviourController.cs

@@ -10,12 +10,12 @@ public interface IBehaviourController : IEntity, IHasUniverseObject
     /// <summary>
     /// Event triggered when a <see cref="IBehaviour"/> is added to the <see cref="IBehaviourController"/>.
     /// </summary>
-    event BehaviourAddedEventHandler? OnBehaviourAdded;
+    Event<IBehaviourController, IBehaviour> OnBehaviourAdded { get; }
 
     /// <summary>
     /// Event triggered when a <see cref="IBehaviour"/> is removed from the <see cref="IBehaviourController"/>.
     /// </summary>
-    event BehaviourRemovedEventHandler? OnBehaviourRemoved;
+    Event<IBehaviourController, IBehaviour> OnBehaviourRemoved { get; }
 
     /// <summary>
     /// Amount of <see cref="IBehaviour"/> collected.

Engine.Core/Abstract/IEntity.cs

@@ -9,7 +9,7 @@ public interface IEntity : IInitializable, IHasStateEnable
     /// Event triggered when the <see cref="Id"/> of the <see cref="IEntity"/> changes.
     /// The string action parameter is the previous <see cref="Id"/> of the <see cref="IEntity"/>. 
     /// </summary>
-    event IdChangedEventHandler? OnIdChanged;
+    Event<IEntity, string> OnIdChanged { get; }
 
     /// <summary>
     /// The ID of the <see cref="IEntity"/>.

Engine.Core/Abstract/IInitializable.cs

@@ -8,12 +8,12 @@ public interface IInitializable
     /// <summary>
     /// Event triggered when the <see cref="Initialize"/> method is called successfully.
     /// </summary>
-    event InitializedEventHandler? OnInitialized;
+    Event<IInitializable> OnInitialized { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="IInitializable"/> method is called successfully.
     /// </summary>
-    event FinalizedEventHandler? OnFinalized;
+    Event<IInitializable> OnFinalized { get; }
 
     /// <summary>
     /// The value indicating whether the entity has been initialized.

Engine.Core/Abstract/INameable.cs

@@ -8,7 +8,7 @@ public interface INameable
     /// <summary>
     /// Event triggered when the name of the entity changes.
     /// </summary>
-    event NameChangedEventHandler? OnNameChanged;
+    Event<INameable, string> OnNameChanged { get; }
 
     /// <summary>
     /// The name of the entity.

Engine.Core/Abstract/IStateEnable.cs

@@ -8,7 +8,7 @@ public interface IStateEnable : IHasEntity
     /// <summary>
     /// Event triggered when the <see cref="Enabled"/> state of the <see cref="IStateEnable"/> changes.
     /// </summary>
-    event EnabledChangedEventHandler? OnEnabledChanged;
+    Event<IStateEnable, bool> OnEnabledChanged { get; }
 
     /// <summary>
     /// The value indicating whether the <see cref="IStateEnable"/> is enabled.

Engine.Core/Abstract/ITransform2D.cs

@@ -8,17 +8,17 @@ public interface ITransform2D : IBehaviour
     /// <summary>
     /// Event triggered when the <see cref="Position"/> of the <see cref="ITransform2D"/> changes.
     /// </summary>
-    event PositionChangedEventHandler? OnPositionChanged;
+    Event<ITransform2D, Vector2D> OnPositionChanged { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="Scale"/> of the <see cref="ITransform2D"/> changes.
     /// </summary>
-    event ScaleChangedEventHandler? OnScaleChanged;
+    Event<ITransform2D, Vector2D> OnScaleChanged { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="Rotation"/> of the <see cref="ITransform"/> changes.
     /// </summary>
-    event RotationChangedEventHandler? OnRotationChanged;
+    Event<ITransform2D, float> OnRotationChanged { get; }
 
     /// <summary>
     /// The world position of the <see cref="ITransform2D"/> in 2D space.

Engine.Core/Abstract/IUniverse.cs

@@ -10,47 +10,47 @@ public interface IUniverse : IEntity, IEnumerable<IUniverseObject>
     /// <summary>
     /// Event triggered when <see cref="Update(UniverseTime)"/> is about to be called called on the <see cref="IUniverse"/>.
     /// </summary>
-    event UpdateEventHandler? OnPreUpdate;
+    Event<IUniverse, UniverseTime> OnPreUpdate { get; }
 
     /// <summary>
     /// Event triggered when <see cref="Update(UniverseTime)"/> is called on the <see cref="IUniverse"/>.
     /// </summary>
-    event UpdateEventHandler? OnUpdate;
+    Event<IUniverse, UniverseTime> OnUpdate { get; }
 
     /// <summary>
     /// Event triggered after <see cref="Update(UniverseTime)"/> is called on the <see cref="IUniverse"/>.
     /// </summary>
-    event UpdateEventHandler? OnPostUpdate;
+    Event<IUniverse, UniverseTime> OnPostUpdate { get; }
 
     /// <summary>
     /// Event triggered when <see cref="Draw"/> is about to be called called on the <see cref="IUniverse"/>.
     /// </summary>
-    event DrawEventHandler? OnPreDraw;
+    Event<IUniverse> OnPreDraw { get; }
 
     /// <summary>
     /// Event triggered when <see cref="Draw"/> is called on the <see cref="IUniverse"/>.
     /// </summary>
-    event DrawEventHandler? OnDraw;
+    Event<IUniverse> OnDraw { get; }
 
     /// <summary>
     /// Event triggered after <see cref="Draw"/> is called on the <see cref="IUniverse"/>.
     /// </summary>
-    event DrawEventHandler? OnPostDraw;
+    Event<IUniverse> OnPostDraw { get; }
 
     /// <summary>
     /// Event triggered when a <see cref="IUniverseObject"/> is registered to the <see cref="IUniverse"/>.
     /// </summary>
-    event UniverseObjectRegisteredEventHandler? OnUniverseObjectRegistered;
+    Event<IUniverse, IUniverseObject> OnUniverseObjectRegistered { get; }
 
     /// <summary>
     /// Event triggered when a <see cref="IUniverseObject"/> is unregistered from the <see cref="IUniverse"/>.
     /// </summary>
-    event UniverseObjectUnRegisteredEventHandler? OnUniverseObjectUnRegistered;
+    Event<IUniverse, IUniverseObject> OnUniverseObjectUnRegistered { get; }
 
     /// <summary>
     /// Event triggered when <see cref="TimeScale"/> is changed on the <see cref="IUniverse"/>.
     /// </summary>
-    event TimeScaleChangedEventHandler? OnTimeScaleChanged;
+    Event<IUniverse, float> OnTimeScaleChanged { get; }
 
     /// <summary>
     /// Current time scale the <see cref="IUniverse"/> operates on.

Engine.Core/Abstract/IUniverseObject.cs

@@ -12,27 +12,27 @@ public interface IUniverseObject : IEntity, IActive, INameable, IHasBehaviourCon
     /// <summary>
     /// Event triggered when the <see cref="IUniverseObject"/> enters the universe.
     /// </summary>
-    event EnteredUniverseEventHandler? OnEnteredUniverse;
+    Event<IUniverseObject, IUniverse> OnEnteredUniverse { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="IUniverseObject"/> exits the universe.
     /// </summary>
-    event ExitedUniverseEventHandler? OnExitedUniverse;
+    Event<IUniverseObject, IUniverse> OnExitedUniverse { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="Parent"/> of the <see cref="IUniverseObject"/> changes. The second parameter is the old <see cref="IUniverseObject"/>.
     /// </summary>
-    event ParentChangedEventHandler? OnParentChanged;
+    Event<IUniverseObject, IUniverseObject?, IUniverseObject?> OnParentChanged { get; }
 
     /// <summary>
     /// Event triggered when a new <see cref="IUniverseObject"/> is added to the <see cref="Children"/>.
     /// </summary>
-    event ChildrenAddedEventHandler? OnChildrenAdded;
+    Event<IUniverseObject, IUniverseObject> OnChildrenAdded { get; }
 
     /// <summary>
     /// Event triggered when an <see cref="IUniverseObject"/> is removed from the <see cref="Children"/>.
     /// </summary>
-    event ChildrenRemovedEventHandler? OnChildrenRemoved;
+    Event<IUniverseObject, IUniverseObject> OnChildrenRemoved { get; }
 
     /// <summary>
     /// Gets the <see cref="IUniverse"/> this <see cref="IUniverseObject"/> is connected to, if any.

Engine.Core/ActiveBehaviourCollector.cs

@@ -1,15 +1,20 @@
-using System.Collections;
+using System;
 using System.Collections.Generic;
 
 namespace Syntriax.Engine.Core;
 
 public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : class, IBehaviour
 {
-    public event IAssignable.UnassignEventHandler? OnUnassigned = null;
+    public Event<IBehaviourCollector<T>, T> OnCollected { get; private set; } = new();
-    public event IHasUniverse.UniverseAssignedEventHandler? OnUniverseAssigned = null;
+    public Event<IBehaviourCollector<T>, T> OnRemoved { get; private set; } = new();
+    public Event<IHasUniverse> OnUniverseAssigned { get; private set; } = new();
+    public Event<IAssignable>? OnUnassigned { get; private set; } = new();
 
-    public event IBehaviourCollector<T>.CollectedEventHandler? OnCollected = null;
+    private readonly Action<IBehaviourController, IBehaviour> cachedOnBehaviourAdded = null!;
-    public event IBehaviourCollector<T>.RemovedEventHandler? OnRemoved = null;
+    private readonly Action<IBehaviourController, IBehaviour> cachedOnBehaviourRemoved = null!;
+    private readonly Action<IActive, bool> cachedOnBehaviourStateChanged = null!;
+    private readonly Action<IUniverse, IUniverseObject> cachedOnUniverseObjectRegistered = null!;
+    private readonly Action<IUniverse, IUniverseObject> cachedOnUniverseObjectUnregistered = null!;
 
     private readonly List<T> monitoringBehaviours = new(32);
     protected readonly List<T> activeBehaviours = new(32);
@@ -17,13 +22,10 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
 
     public IUniverse Universe { get; private set; } = null!;
 
-    public ActiveBehaviourCollector() { }
-    public ActiveBehaviourCollector(IUniverse universe) => Assign(universe);
-
     private void OnUniverseObjectRegistered(IUniverse manager, IUniverseObject universeObject)
     {
-        universeObject.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
+        universeObject.BehaviourController.OnBehaviourAdded.AddListener(cachedOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
+        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(cachedOnBehaviourRemoved);
 
         for (int i = 0; i < universeObject.BehaviourController.Count; i++)
             OnBehaviourAdded(universeObject.BehaviourController, universeObject.BehaviourController[i]);
@@ -31,8 +33,8 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
 
     private void OnUniverseObjectUnregistered(IUniverse manager, IUniverseObject universeObject)
     {
-        universeObject.BehaviourController.OnBehaviourAdded -= OnBehaviourAdded;
+        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(cachedOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved -= OnBehaviourRemoved;
+        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(cachedOnBehaviourRemoved);
 
         for (int i = 0; i < universeObject.BehaviourController.Count; i++)
             OnBehaviourRemoved(universeObject.BehaviourController, universeObject.BehaviourController[i]);
@@ -46,7 +48,7 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
 
         monitoringBehaviours.Add(tBehaviour);
         monitoringActiveToBehaviour.Add(tBehaviour, tBehaviour);
-        tBehaviour.OnActiveChanged += OnBehaviourStateChanged;
+        tBehaviour.OnActiveChanged.AddListener(cachedOnBehaviourStateChanged);
         OnBehaviourStateChanged(tBehaviour, !tBehaviour.IsActive);
     }
 
@@ -75,7 +77,7 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
         if (!monitoringBehaviours.Remove(tBehaviour) || !monitoringActiveToBehaviour.Remove(tBehaviour))
             return;
 
-        tBehaviour.OnActiveChanged -= OnBehaviourStateChanged;
+        tBehaviour.OnActiveChanged.RemoveListener(cachedOnBehaviourStateChanged);
         if (activeBehaviours.Remove(tBehaviour))
         {
             OnBehaviourRemove(tBehaviour);
@@ -91,8 +93,8 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
         foreach (IUniverseObject universeObject in universe.UniverseObjects)
             OnUniverseObjectRegistered(universe, universeObject);
 
-        universe.OnUniverseObjectRegistered += OnUniverseObjectRegistered;
+        universe.OnUniverseObjectRegistered.AddListener(cachedOnUniverseObjectRegistered);
-        universe.OnUniverseObjectUnRegistered += OnUniverseObjectUnregistered;
+        universe.OnUniverseObjectUnRegistered.AddListener(cachedOnUniverseObjectUnregistered);
 
         Universe = universe;
         OnUniverseAssigned?.Invoke(this);
@@ -108,8 +110,8 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
         foreach (IUniverseObject universeObject in Universe.UniverseObjects)
             OnUniverseObjectUnregistered(Universe, universeObject);
 
-        Universe.OnUniverseObjectRegistered -= OnUniverseObjectRegistered;
+        Universe.OnUniverseObjectRegistered.RemoveListener(cachedOnUniverseObjectRegistered);
-        Universe.OnUniverseObjectUnRegistered -= OnUniverseObjectUnregistered;
+        Universe.OnUniverseObjectUnRegistered.RemoveListener(cachedOnUniverseObjectUnregistered);
 
         Universe = null!;
         OnUnassigned?.Invoke(this);
@@ -117,5 +119,14 @@ public class ActiveBehaviourCollector<T> : IBehaviourCollector<T> where T : clas
     }
 
     public int Count => activeBehaviours.Count;
-    public T this[System.Index index] => activeBehaviours[index];
+    public T this[Index index] => activeBehaviours[index];
+
+    public ActiveBehaviourCollector()
+    {
+        cachedOnBehaviourAdded = OnBehaviourAdded;
+        cachedOnBehaviourRemoved = OnBehaviourRemoved;
+        cachedOnBehaviourStateChanged = OnBehaviourStateChanged;
+        cachedOnUniverseObjectRegistered = OnUniverseObjectRegistered;
+        cachedOnUniverseObjectUnregistered = OnUniverseObjectUnregistered;
+    }
 }

Engine.Core/ActiveBehaviourCollectorSorted.cs

@@ -22,7 +22,4 @@ public class ActiveBehaviourCollectorSorted<T> : ActiveBehaviourCollector<T> whe
         if (SortBy is not null)
             activeBehaviours.Sort(SortBy);
     }
-
-    public ActiveBehaviourCollectorSorted() { }
-    public ActiveBehaviourCollectorSorted(IUniverse universe, Comparison<T> sortBy) : base(universe) => SortBy = sortBy;
 }

Engine.Core/BaseEntity.cs

@@ -4,13 +4,11 @@ namespace Syntriax.Engine.Core;
 
 public abstract class BaseEntity : IEntity
 {
-    public event IEntity.IdChangedEventHandler? OnIdChanged = null;
+    public Event<IEntity, string> OnIdChanged { get; private set; } = new();
-
+    public Event<IInitializable> OnInitialized { get; private set; } = new();
-    public event IInitializable.InitializedEventHandler? OnInitialized = null;
+    public Event<IInitializable> OnFinalized { get; private set; } = new();
-    public event IInitializable.FinalizedEventHandler? OnFinalized = null;
+    public Event<IHasStateEnable> OnStateEnableAssigned { get; private set; } = new();
-
+    public Event<IAssignable> OnUnassigned { get; private set; } = new();
-    public event IHasStateEnable.StateEnableAssignedEventHandler? OnStateEnableAssigned = null;
-    public event IAssignable.UnassignEventHandler? OnUnassigned = null;
 
     private IStateEnable _stateEnable = null!;
 

Engine.Core/Behaviour.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Syntriax.Engine.Core;
 
 public abstract class Behaviour : BehaviourBase, IFirstFrameUpdate,
@@ -7,11 +9,17 @@ public abstract class Behaviour : BehaviourBase, IFirstFrameUpdate,
     protected IUniverse Universe => BehaviourController.UniverseObject.Universe;
     protected IUniverseObject UniverseObject => BehaviourController.UniverseObject;
 
+    private readonly Action<IUniverseObject, IUniverse> cachedEnteredUniverse = null!;
+    private readonly Action<IUniverseObject, IUniverse> cachedExitedUniverse = null!;
+
     public Behaviour()
     {
-        OnInitialized += OnInitialize;
+        OnInitialized.AddListener(OnInitialize);
-        OnFinalized += OnFinalize;
+        OnFinalized.AddListener(OnFinalize);
-        OnUnassigned += OnUnassign;
+        OnUnassigned.AddListener(OnUnassign);
+
+        cachedEnteredUniverse = EnteredUniverse;
+        cachedExitedUniverse = ExitedUniverse;
     }
 
     protected virtual void OnUnassign() { }
@@ -20,8 +28,8 @@ public abstract class Behaviour : BehaviourBase, IFirstFrameUpdate,
     protected virtual void OnInitialize() { }
     protected virtual void OnInitialize(IInitializable _)
     {
-        BehaviourController.UniverseObject.OnEnteredUniverse += EnteredUniverse;
+        BehaviourController.UniverseObject.OnEnteredUniverse.AddListener(cachedEnteredUniverse);
-        BehaviourController.UniverseObject.OnExitedUniverse += ExitedUniverse;
+        BehaviourController.UniverseObject.OnExitedUniverse.AddListener(cachedExitedUniverse);
 
         OnInitialize();
 
@@ -32,8 +40,8 @@ public abstract class Behaviour : BehaviourBase, IFirstFrameUpdate,
     protected virtual void OnFinalize() { }
     protected virtual void OnFinalize(IInitializable _)
     {
-        BehaviourController.UniverseObject.OnEnteredUniverse -= EnteredUniverse;
+        BehaviourController.UniverseObject.OnEnteredUniverse.RemoveListener(cachedEnteredUniverse);
-        BehaviourController.UniverseObject.OnExitedUniverse -= ExitedUniverse;
+        BehaviourController.UniverseObject.OnExitedUniverse.RemoveListener(cachedExitedUniverse);
 
         OnFinalize();
 

Engine.Core/BehaviourBase.cs

@@ -1,11 +1,17 @@
+using System;
+
 namespace Syntriax.Engine.Core;
 
 [System.Diagnostics.DebuggerDisplay("{GetType().Name, nq}, Priority: {Priority}, Initialized: {Initialized}")]
 public abstract class BehaviourBase : BaseEntity, IBehaviour
 {
-    public event IHasBehaviourController.BehaviourControllerAssignedEventHandler? OnBehaviourControllerAssigned = null;
+    public Event<IBehaviour, int> OnPriorityChanged { get; private set; } = new();
-    public event IBehaviour.PriorityChangedEventHandler? OnPriorityChanged = null;
+    public Event<IActive, bool> OnActiveChanged { get; private set; } = new();
-    public event IActive.ActiveChangedEventHandler? OnActiveChanged = null;
+    public Event<IHasBehaviourController> OnBehaviourControllerAssigned { get; private set; } = new();
+
+    private Action<IHasUniverseObject> cachedOnUniverseObjectAssigned = null!;
+    private Action<IActive, bool> cachedOnUniverseObjectActiveChanged = null!;
+    private Action<IStateEnable, bool> cachedOnStateEnabledChanged = null!;
 
     private IBehaviourController _behaviourController = null!;
     public IBehaviourController BehaviourController => _behaviourController;
@@ -36,7 +42,7 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
 
         _behaviourController = behaviourController;
         OnAssign(behaviourController);
-        behaviourController.OnUniverseObjectAssigned += OnUniverseObjectAssigned;
+        behaviourController.OnUniverseObjectAssigned.AddListener(cachedOnUniverseObjectAssigned);
         if (behaviourController.UniverseObject is not null)
             OnUniverseObjectAssigned(behaviourController);
         OnBehaviourControllerAssigned?.Invoke(this);
@@ -45,7 +51,7 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
 
     private void OnUniverseObjectAssigned(IHasUniverseObject sender)
     {
-        sender.UniverseObject.OnActiveChanged += OnUniverseObjectActiveChanged;
+        sender.UniverseObject.OnActiveChanged.AddListener(cachedOnUniverseObjectActiveChanged);
         UpdateActive();
     }
 
@@ -53,13 +59,14 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
     {
         base.OnAssign(stateEnable);
 
-        stateEnable.OnEnabledChanged += OnStateEnabledChanged;
+        stateEnable.OnEnabledChanged.AddListener(cachedOnStateEnabledChanged);
     }
 
     protected override void UnassignInternal()
     {
-        StateEnable.OnEnabledChanged -= OnStateEnabledChanged;
+        BehaviourController.UniverseObject.OnActiveChanged.RemoveListener(cachedOnUniverseObjectActiveChanged);
-        BehaviourController.OnUniverseObjectAssigned -= OnUniverseObjectAssigned;
+        StateEnable.OnEnabledChanged.RemoveListener(cachedOnStateEnabledChanged);
+        BehaviourController.OnUniverseObjectAssigned.RemoveListener(cachedOnUniverseObjectAssigned);
         base.UnassignInternal();
         _behaviourController = null!;
     }
@@ -81,4 +88,11 @@ public abstract class BehaviourBase : BaseEntity, IBehaviour
         if (previousActive != IsActive)
             OnActiveChanged?.Invoke(this, previousActive);
     }
+
+    protected BehaviourBase()
+    {
+        cachedOnUniverseObjectAssigned = OnUniverseObjectAssigned;
+        cachedOnUniverseObjectActiveChanged = OnUniverseObjectActiveChanged;
+        cachedOnStateEnabledChanged = OnStateEnabledChanged;
+    }
 }

Engine.Core/BehaviourCollector.cs

@@ -1,27 +1,28 @@
-using System.Collections;
+using System;
 using System.Collections.Generic;
 
 namespace Syntriax.Engine.Core;
 
 public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
 {
-    public event IAssignable.UnassignEventHandler? OnUnassigned = null;
+    public Event<IBehaviourCollector<T>, T> OnCollected { get; private set; } = new();
-    public event IHasUniverse.UniverseAssignedEventHandler? OnUniverseAssigned = null;
+    public Event<IBehaviourCollector<T>, T> OnRemoved { get; private set; } = new();
+    public Event<IHasUniverse> OnUniverseAssigned { get; private set; } = new();
+    public Event<IAssignable>? OnUnassigned { get; private set; } = new();
 
-    public event IBehaviourCollector<T>.CollectedEventHandler? OnCollected = null;
+    private readonly Action<IBehaviourController, IBehaviour> cachedOnBehaviourAdded = null!;
-    public event IBehaviourCollector<T>.RemovedEventHandler? OnRemoved = null;
+    private readonly Action<IBehaviourController, IBehaviour> cachedOnBehaviourRemoved = null!;
+    private readonly Action<IUniverse, IUniverseObject> cachedOnUniverseObjectRegistered = null!;
+    private readonly Action<IUniverse, IUniverseObject> cachedOnUniverseObjectUnregistered = null!;
 
     protected readonly List<T> behaviours = new(32);
 
     public IUniverse Universe { get; private set; } = null!;
 
-    public BehaviourCollector() { }
-    public BehaviourCollector(IUniverse universe) => Assign(universe);
-
     private void OnUniverseObjectRegistered(IUniverse manager, IUniverseObject universeObject)
     {
-        universeObject.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
+        universeObject.BehaviourController.OnBehaviourAdded.AddListener(cachedOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
+        universeObject.BehaviourController.OnBehaviourRemoved.AddListener(cachedOnBehaviourRemoved);
 
         for (int i = 0; i < universeObject.BehaviourController.Count; i++)
             OnBehaviourAdded(universeObject.BehaviourController, universeObject.BehaviourController[i]);
@@ -29,8 +30,8 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
 
     private void OnUniverseObjectUnregistered(IUniverse manager, IUniverseObject universeObject)
     {
-        universeObject.BehaviourController.OnBehaviourAdded -= OnBehaviourAdded;
+        universeObject.BehaviourController.OnBehaviourAdded.RemoveListener(cachedOnBehaviourAdded);
-        universeObject.BehaviourController.OnBehaviourRemoved -= OnBehaviourRemoved;
+        universeObject.BehaviourController.OnBehaviourRemoved.RemoveListener(cachedOnBehaviourRemoved);
 
         for (int i = 0; i < universeObject.BehaviourController.Count; i++)
             OnBehaviourRemoved(universeObject.BehaviourController, universeObject.BehaviourController[i]);
@@ -69,8 +70,8 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
         foreach (IUniverseObject universeObject in universe.UniverseObjects)
             OnUniverseObjectRegistered(universe, universeObject);
 
-        universe.OnUniverseObjectRegistered += OnUniverseObjectRegistered;
+        universe.OnUniverseObjectRegistered.AddListener(cachedOnUniverseObjectRegistered);
-        universe.OnUniverseObjectUnRegistered += OnUniverseObjectUnregistered;
+        universe.OnUniverseObjectUnRegistered.AddListener(cachedOnUniverseObjectUnregistered);
 
         Universe = universe;
         OnAssign(universe);
@@ -87,8 +88,8 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
         foreach (IUniverseObject universeObject in Universe.UniverseObjects)
             OnUniverseObjectUnregistered(Universe, universeObject);
 
-        Universe.OnUniverseObjectRegistered -= OnUniverseObjectRegistered;
+        Universe.OnUniverseObjectRegistered.RemoveListener(cachedOnUniverseObjectRegistered);
-        Universe.OnUniverseObjectUnRegistered -= OnUniverseObjectUnregistered;
+        Universe.OnUniverseObjectUnRegistered.RemoveListener(cachedOnUniverseObjectUnregistered);
 
         Universe = null!;
         OnUnassigned?.Invoke(this);
@@ -96,5 +97,13 @@ public class BehaviourCollector<T> : IBehaviourCollector<T> where T : class
     }
 
     public int Count => behaviours.Count;
-    public T this[System.Index index] => behaviours[index];
+    public T this[Index index] => behaviours[index];
+
+    public BehaviourCollector()
+    {
+        cachedOnBehaviourAdded = OnBehaviourAdded;
+        cachedOnBehaviourRemoved = OnBehaviourRemoved;
+        cachedOnUniverseObjectRegistered = OnUniverseObjectRegistered;
+        cachedOnUniverseObjectUnregistered = OnUniverseObjectUnregistered;
+    }
 }

Engine.Core/BehaviourCollectorSorted.cs

@@ -22,7 +22,4 @@ public class BehaviourCollectorSorted<T> : BehaviourCollector<T> where T : class
         if (SortBy is not null)
             behaviours.Sort(SortBy);
     }
-
-    public BehaviourCollectorSorted() { }
-    public BehaviourCollectorSorted(IUniverse universe, Comparison<T> sortBy) : base(universe) => SortBy = sortBy;
 }

Engine.Core/BehaviourController.cs

@@ -8,9 +8,9 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("Behaviour Count: {behaviours.Count}")]
 public class BehaviourController : BaseEntity, IBehaviourController
 {
-    public event IBehaviourController.BehaviourAddedEventHandler? OnBehaviourAdded = null;
+    public Event<IBehaviourController, IBehaviour> OnBehaviourAdded { get; private set; } = new();
-    public event IBehaviourController.BehaviourRemovedEventHandler? OnBehaviourRemoved = null;
+    public Event<IBehaviourController, IBehaviour> OnBehaviourRemoved { get; private set; } = new();
-    public event IHasUniverseObject.UniverseObjectAssignedEventHandler? OnUniverseObjectAssigned = null;
+    public Event<IHasUniverseObject> OnUniverseObjectAssigned { get; private set; } = new();
 
     private readonly IList<IBehaviour> behaviours = new List<IBehaviour>(Constants.BEHAVIOURS_SIZE_INITIAL);
 
@@ -20,6 +20,9 @@ public class BehaviourController : BaseEntity, IBehaviourController
     public int Count => behaviours.Count;
     public IBehaviour this[Index index] => behaviours[index];
 
+    public int Count => behaviours.Count;
+    public IBehaviour this[Index index] => behaviours[index];
+
     public T AddBehaviour<T>(T behaviour) where T : class, IBehaviour
     {
         InsertBehaviourByPriority(behaviour);
@@ -28,7 +31,7 @@ public class BehaviourController : BaseEntity, IBehaviourController
 
         if (IsInitialized)
             behaviour.Initialize();
-        behaviour.OnPriorityChanged += OnPriorityChange;
+        behaviour.OnPriorityChanged.AddListener(OnPriorityChange);
         OnBehaviourAdded?.Invoke(this, behaviour);
         return behaviour;
     }
@@ -94,7 +97,7 @@ public class BehaviourController : BaseEntity, IBehaviourController
         if (!behaviours.Contains(behaviour))
             throw new Exception($"{behaviour.GetType().Name} does not exist in {UniverseObject.Name}'s {nameof(IBehaviourController)}.");
 
-        behaviour.OnPriorityChanged -= OnPriorityChange;
+        behaviour.OnPriorityChanged.RemoveListener(OnPriorityChange);
         behaviour.Finalize();
         behaviours.Remove(behaviour);
         OnBehaviourRemoved?.Invoke(this, behaviour);

Engine.Core/CoroutineManager.cs

@@ -20,12 +20,12 @@ public class CoroutineManager : UniverseObject
 
     protected override void OnEnteringUniverse(IUniverse universe)
     {
-        universe.OnUpdate += OnUpdate;
+        universe.OnUpdate.AddListener(OnUpdate);
     }
 
     protected override void OnExitingUniverse(IUniverse universe)
     {
-        universe.OnUpdate -= OnUpdate;
+        universe.OnUpdate.RemoveListener(OnUpdate);
     }
 
     private void OnUpdate(IUniverse sender, UniverseTime time)

Engine.Core/Helpers/Event.cs

@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+
+namespace Syntriax.Engine.Core;
+
+public class Event
+{
+    private readonly List<Action> listeners = new(1000);
+
+    public void AddListener(Action listener) => listeners.Add(listener);
+    public void RemoveListener(Action listener) => listeners.Remove(listener);
+    public void Invoke()
+    {
+        for (int i = 0; i < listeners.Count; i++)
+            try { listeners[i].Invoke(); }
+            catch (Exception exception)
+            {
+                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}()";
+                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+            }
+    }
+}
+
+public class Event<T1>
+{
+    private readonly List<Action<T1>> listeners = new(1000);
+
+    public void AddListener(Action<T1> listener) => listeners.Add(listener);
+    public void RemoveListener(Action<T1> listener) => listeners.Remove(listener);
+    public void Invoke(T1 argument)
+    {
+        for (int i = 0; i < listeners.Count; i++)
+            try { listeners[i].Invoke(argument); }
+            catch (Exception exception)
+            {
+                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({argument})";
+                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+            }
+    }
+}
+
+public class Event<T1, T2>
+{
+    private readonly List<Action<T1, T2>> listeners = new(1000);
+
+    public void AddListener(Action<T1, T2> listener) => listeners.Add(listener);
+    public void RemoveListener(Action<T1, T2> listener) => listeners.Remove(listener);
+    public void Invoke(T1 argument1, T2 argument2)
+    {
+        for (int i = 0; i < listeners.Count; i++)
+            try { listeners[i].Invoke(argument1, argument2); }
+            catch (Exception exception)
+            {
+                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({string.Join(", ", argument1, argument2)})";
+                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+            }
+    }
+}
+
+public class Event<T1, T2, T3>
+{
+    private readonly List<Action<T1, T2, T3>> listeners = new(1000);
+
+    public void AddListener(Action<T1, T2, T3> listener) => listeners.Add(listener);
+    public void RemoveListener(Action<T1, T2, T3> listener) => listeners.Remove(listener);
+    public void Invoke(T1 argument1, T2 argument2, T3 argument3)
+    {
+        for (int i = 0; i < listeners.Count; i++)
+            try { listeners[i].Invoke(argument1, argument2, argument3); }
+            catch (Exception exception)
+            {
+                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({string.Join(", ", argument1, argument2, argument3)})";
+                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+            }
+    }
+}
+
+public class Event<T1, T2, T3, T4>
+{
+    private readonly List<Action<T1, T2, T3, T4>> listeners = new(1000);
+
+    public void AddListener(Action<T1, T2, T3, T4> listener) => listeners.Add(listener);
+    public void RemoveListener(Action<T1, T2, T3, T4> listener) => listeners.Remove(listener);
+    public void Invoke(T1 argument1, T2 argument2, T3 argument3, T4 argument4)
+    {
+        for (int i = 0; i < listeners.Count; i++)
+            try { listeners[i].Invoke(argument1, argument2, argument3, argument4); }
+            catch (Exception exception)
+            {
+                string methodCallRepresentation = $"{listeners[i].Method.DeclaringType?.FullName}.{listeners[i].Method.Name}({string.Join(", ", argument1, argument2, argument3, argument4)})";
+                Console.WriteLine($"Unexpected exception on invocation of method {methodCallRepresentation}:{Environment.NewLine}{exception.InnerException}");
+            }
+    }
+}

Engine.Core/Primitives/Shape2D.cs

@@ -18,7 +18,7 @@ public class Shape2D(List<Vector2D> vertices) : IEnumerable<Vector2D>
     public static Shape2D Pentagon => CreateNgon(5, Vector2D.Up);
     public static Shape2D Hexagon => CreateNgon(6, Vector2D.Right);
 
-    public event ShapeUpdatedEventHandler? OnShapeUpdated = null;
+    public Event<Shape2D> OnShapeUpdated { get; private set; } = new();
 
     private List<Vector2D> _vertices = vertices;
 

Engine.Core/StateEnable.cs

@@ -2,9 +2,9 @@ namespace Syntriax.Engine.Core;
 
 public class StateEnable : IStateEnable
 {
-    public event IAssignable.UnassignEventHandler? OnUnassigned = null;
+    public Event<IStateEnable, bool> OnEnabledChanged { get; private set; } = new();
-    public event IHasEntity.EntityAssignedEventHandler? OnEntityAssigned = null;
+    public Event<IHasEntity> OnEntityAssigned { get; private set; } = new();
-    public event IStateEnable.EnabledChangedEventHandler? OnEnabledChanged = null;
+    public Event<IAssignable>? OnUnassigned { get; private set; } = new();
 
     private bool _enabled = true;
     private IEntity _entity = null!;

Engine.Core/Systems/DrawManager.cs

@@ -33,9 +33,9 @@ public class DrawManager : UniverseObject
         drawEntities.Assign(universe);
         postDrawEntities.Assign(universe);
 
-        universe.OnPreDraw += OnPreDraw;
+        universe.OnPreDraw.AddListener(OnPreDraw);
-        universe.OnDraw += OnDraw;
+        universe.OnDraw.AddListener(OnDraw);
-        universe.OnPostDraw += OnPostDraw;
+        universe.OnPostDraw.AddListener(OnPostDraw);
     }
 
     protected override void OnExitingUniverse(IUniverse universe)
@@ -44,8 +44,8 @@ public class DrawManager : UniverseObject
         drawEntities.Unassign();
         postDrawEntities.Unassign();
 
-        universe.OnPreDraw -= OnPreDraw;
+        universe.OnPreDraw.RemoveListener(OnPreDraw);
-        universe.OnDraw -= OnDraw;
+        universe.OnDraw.RemoveListener(OnDraw);
-        universe.OnPostDraw -= OnPostDraw;
+        universe.OnPostDraw.RemoveListener(OnPostDraw);
     }
 }

Engine.Core/Systems/UpdateManager.cs

@@ -21,9 +21,9 @@ public class UpdateManager : UniverseObject
         updateEntities.Assign(universe);
         postUpdateEntities.Assign(universe);
 
-        universe.OnPreUpdate += OnPreUpdate;
+        universe.OnPreUpdate.AddListener(OnPreUpdate);
-        universe.OnUpdate += OnUpdate;
+        universe.OnUpdate.AddListener(OnUpdate);
-        universe.OnPostUpdate += OnPostUpdate;
+        universe.OnPostUpdate.AddListener(OnPostUpdate);
     }
 
     protected override void OnExitingUniverse(IUniverse universe)
@@ -33,9 +33,9 @@ public class UpdateManager : UniverseObject
         updateEntities.Unassign();
         postUpdateEntities.Unassign();
 
-        universe.OnPreUpdate -= OnPreUpdate;
+        universe.OnPreUpdate.RemoveListener(OnPreUpdate);
-        universe.OnUpdate -= OnUpdate;
+        universe.OnUpdate.RemoveListener(OnUpdate);
-        universe.OnPostUpdate -= OnPostUpdate;
+        universe.OnPostUpdate.RemoveListener(OnPostUpdate);
     }
 
     private void OnPreUpdate(IUniverse sender, UniverseTime engineTime)
@@ -69,6 +69,6 @@ public class UpdateManager : UniverseObject
 
     public UpdateManager()
     {
-        firstFrameUpdates.OnCollected += OnFirstFrameCollected;
+        firstFrameUpdates.OnCollected.AddListener(OnFirstFrameCollected);
     }
 }

Engine.Core/Transform2D.cs

@@ -5,9 +5,9 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("Name: {UniverseObject.Name, nq} Position: {Position.ToString(), nq}, Scale: {Scale.ToString(), nq}, Rotation: {Rotation}")]
 public class Transform2D : Behaviour, ITransform2D
 {
-    public event ITransform2D.PositionChangedEventHandler? OnPositionChanged = null;
+    public Event<ITransform2D, Vector2D> OnPositionChanged { get; private set; } = new();
-    public event ITransform2D.ScaleChangedEventHandler? OnScaleChanged = null;
+    public Event<ITransform2D, Vector2D> OnScaleChanged { get; private set; } = new();
-    public event ITransform2D.RotationChangedEventHandler? OnRotationChanged = null;
+    public Event<ITransform2D, float> OnRotationChanged { get; private set; } = new();
 
     private Vector2D _position = Vector2D.Zero;
     private Vector2D _scale = Vector2D.One;
@@ -207,12 +207,12 @@ public class Transform2D : Behaviour, ITransform2D
     protected override void InitializeInternal()
     {
         UpdateReferences(UniverseObject.Parent);
-        UniverseObject.OnParentChanged += OnParentChanged;
+        UniverseObject.OnParentChanged.AddListener(OnParentChanged);
     }
 
     protected override void FinalizeInternal()
     {
-        UniverseObject.OnParentChanged -= OnParentChanged;
+        UniverseObject.OnParentChanged.RemoveListener(OnParentChanged);
     }
 
     private void UpdateReferences(IUniverseObject? parent)
@@ -220,28 +220,28 @@ public class Transform2D : Behaviour, ITransform2D
         ITransform2D? previousParent = parentTransform;
         if (previousParent is not null)
         {
-            previousParent.OnPositionChanged -= RecalculatePosition;
+            previousParent.OnPositionChanged.RemoveListener(RecalculatePosition);
-            previousParent.OnScaleChanged -= RecalculateScale;
+            previousParent.OnScaleChanged.RemoveListener(RecalculateScale);
-            previousParent.OnRotationChanged -= RecalculateRotation;
+            previousParent.OnRotationChanged.RemoveListener(RecalculateRotation);
-            previousParent.BehaviourController.UniverseObject.OnParentChanged -= OnParentChanged;
+            previousParent.BehaviourController.UniverseObject.OnParentChanged.RemoveListener(OnParentChanged);
-            previousParent.BehaviourController.OnBehaviourAdded -= LookForTransform2D;
+            previousParent.BehaviourController.OnBehaviourAdded.RemoveListener(LookForTransform2D);
         }
 
         parentTransform = parent?.BehaviourController.GetBehaviour<ITransform2D>();
 
         if (parentTransform is not null)
         {
-            parentTransform.OnPositionChanged += RecalculatePosition;
+            parentTransform.OnPositionChanged.AddListener(RecalculatePosition);
-            parentTransform.OnScaleChanged += RecalculateScale;
+            parentTransform.OnScaleChanged.AddListener(RecalculateScale);
-            parentTransform.OnRotationChanged += RecalculateRotation;
+            parentTransform.OnRotationChanged.AddListener(RecalculateRotation);
-            parentTransform.BehaviourController.UniverseObject.OnParentChanged += OnParentChanged;
+            parentTransform.BehaviourController.UniverseObject.OnParentChanged.AddListener(OnParentChanged);
 
             UpdatePosition();
             UpdateScale();
             UpdateRotation();
         }
         else if (UniverseObject.Parent is not null)
-            UniverseObject.Parent.BehaviourController.OnBehaviourAdded += LookForTransform2D;
+            UniverseObject.Parent.BehaviourController.OnBehaviourAdded.AddListener(LookForTransform2D);
 
         UpdateLocalPosition();
         UpdateLocalScale();

Engine.Core/Universe.cs

@@ -7,21 +7,28 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("UniverseObject Count: {_universeObjects.Count}")]
 public class Universe : BaseEntity, IUniverse
 {
-    public event IUniverse.UpdateEventHandler? OnPreUpdate = null;
+    public Event<IUniverse, UniverseTime> OnPreUpdate { get; set; } = new();
-    public event IUniverse.UpdateEventHandler? OnUpdate = null;
+    public Event<IUniverse, UniverseTime> OnUpdate { get; set; } = new();
-    public event IUniverse.UpdateEventHandler? OnPostUpdate = null;
+    public Event<IUniverse, UniverseTime> OnPostUpdate { get; set; } = new();
-    public event IUniverse.DrawEventHandler? OnPreDraw = null;
+    public Event<IUniverse> OnPreDraw { get; set; } = new();
-    public event IUniverse.DrawEventHandler? OnDraw = null;
+    public Event<IUniverse> OnDraw { get; set; } = new();
-    public event IUniverse.DrawEventHandler? OnPostDraw = null;
+    public Event<IUniverse> OnPostDraw { get; set; } = new();
+    public Event<IUniverse, IUniverseObject> OnUniverseObjectRegistered { get; set; } = new();
+    public Event<IUniverse, IUniverseObject> OnUniverseObjectUnRegistered { get; set; } = new();
+    public Event<IUniverse, float> OnTimeScaleChanged { get; set; } = new();
 
-    public event IUniverse.UniverseObjectRegisteredEventHandler? OnUniverseObjectRegistered = null;
+    private readonly Action<IInitializable> cachedOnUniverseObjectFinalize = null!;
-    public event IUniverse.UniverseObjectUnRegisteredEventHandler? OnUniverseObjectUnRegistered = null;
+    private readonly Action<IUniverseObject, IUniverse> cachedOnUniverseObjectExitedUniverse = null!;
-
-    public event IUniverse.TimeScaleChangedEventHandler? OnTimeScaleChanged = null;
 
     private readonly List<IUniverseObject> _universeObjects = new(Constants.UNIVERSE_OBJECTS_SIZE_INITIAL);
     private float _timeScale = 1f;
 
+    public Universe()
+    {
+        cachedOnUniverseObjectFinalize = OnUniverseObjectFinalize;
+        cachedOnUniverseObjectExitedUniverse = OnUniverseObjectExitedUniverse;
+    }
+
     public IReadOnlyList<IUniverseObject> UniverseObjects => _universeObjects;
 
     public UniverseTime Time { get; private set; } = new();
@@ -46,8 +53,8 @@ public class Universe : BaseEntity, IUniverse
         if (_universeObjects.Contains(universeObject))
             throw new Exception($"{nameof(IUniverseObject)} named {universeObject.Name} is already registered to the {nameof(Universe)}.");
 
-        universeObject.OnFinalized += OnUniverseObjectFinalize;
+        universeObject.OnFinalized.AddListener(cachedOnUniverseObjectFinalize);
-        universeObject.OnExitedUniverse += OnUniverseObjectExitedUniverse;
+        universeObject.OnExitedUniverse.AddListener(cachedOnUniverseObjectExitedUniverse);
 
         if (!universeObject.Initialize())
             throw new Exception($"{universeObject.Name} can't be initialized");
@@ -81,8 +88,8 @@ public class Universe : BaseEntity, IUniverse
         if (!_universeObjects.Contains(universeObject))
             throw new Exception($"{nameof(IUniverseObject)} named {universeObject.Name} is not registered to the {nameof(Universe)}.");
 
-        universeObject.OnFinalized -= OnUniverseObjectFinalize;
+        universeObject.OnFinalized.RemoveListener(cachedOnUniverseObjectFinalize);
-        universeObject.OnExitedUniverse -= OnUniverseObjectExitedUniverse;
+        universeObject.OnExitedUniverse.RemoveListener(cachedOnUniverseObjectExitedUniverse);
 
         for (int i = universeObject.Children.Count - 1; i >= 0; i--)
             Remove(universeObject.Children[i]);

Engine.Core/UniverseObject.cs

@@ -6,14 +6,14 @@ namespace Syntriax.Engine.Core;
 [System.Diagnostics.DebuggerDisplay("Name: {Name}, Initialized: {Initialized}")]
 public class UniverseObject : BaseEntity, IUniverseObject
 {
-    public event IUniverseObject.EnteredUniverseEventHandler? OnEnteredUniverse = null;
+    public Event<IUniverseObject, IUniverse> OnEnteredUniverse { get; private set; } = new();
-    public event IUniverseObject.ExitedUniverseEventHandler? OnExitedUniverse = null;
+    public Event<IUniverseObject, IUniverse> OnExitedUniverse { get; private set; } = new();
-    public event IUniverseObject.ParentChangedEventHandler? OnParentChanged = null;
+    public Event<IUniverseObject, IUniverseObject?, IUniverseObject?> OnParentChanged { get; private set; } = new();
-    public event IUniverseObject.ChildrenAddedEventHandler? OnChildrenAdded = null;
+    public Event<IUniverseObject, IUniverseObject> OnChildrenAdded { get; private set; } = new();
-    public event IUniverseObject.ChildrenRemovedEventHandler? OnChildrenRemoved = null;
+    public Event<IUniverseObject, IUniverseObject> OnChildrenRemoved { get; private set; } = new();
-    public event IHasBehaviourController.BehaviourControllerAssignedEventHandler? OnBehaviourControllerAssigned = null;
+    public Event<IActive, bool> OnActiveChanged { get; private set; } = new();
-    public event INameable.NameChangedEventHandler? OnNameChanged = null;
+    public Event<INameable, string> OnNameChanged { get; private set; } = new();
-    public event IActive.ActiveChangedEventHandler? OnActiveChanged = null;
+    public Event<IHasBehaviourController> OnBehaviourControllerAssigned { get; private set; } = new();
 
     private string _name = nameof(UniverseObject);
     private IUniverse _universe = null!;
@@ -78,7 +78,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
         if (previousParent is not null)
         {
             previousParent.RemoveChild(this);
-            previousParent.OnActiveChanged -= OnParentActiveChanged;
+            previousParent.OnActiveChanged.RemoveListener(OnParentActiveChanged);
         }
 
         Parent = parent;
@@ -89,7 +89,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
                 parent.Universe.Register(this);
 
             parent.AddChild(this);
-            parent.OnActiveChanged += OnParentActiveChanged;
+            parent.OnActiveChanged.AddListener(OnParentActiveChanged);
         }
 
         UpdateActive();
@@ -131,7 +131,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
     {
         base.OnAssign(stateEnable);
 
-        stateEnable.OnEnabledChanged += OnStateEnabledChanged;
+        stateEnable.OnEnabledChanged.AddListener(OnStateEnabledChanged);
     }
 
     private void OnParentActiveChanged(IActive sender, bool previousState) => UpdateActive();
@@ -149,7 +149,7 @@ public class UniverseObject : BaseEntity, IUniverseObject
     protected override void UnassignInternal()
     {
         base.UnassignInternal();
-        StateEnable.OnEnabledChanged -= OnStateEnabledChanged;
+        StateEnable.OnEnabledChanged.RemoveListener(OnStateEnabledChanged);
     }
 
     protected override void InitializeInternal()

Engine.Physics2D/Abstract/ICollider2D.cs

@@ -10,17 +10,17 @@ public interface ICollider2D : IBehaviour
     /// <summary>
     /// Event triggered when a collision is detected.
     /// </summary>
-    event CollisionDetectedEventHandler? OnCollisionDetected;
+    Event<ICollider2D, CollisionDetectionInformation> OnCollisionDetected { get; }
 
     /// <summary>
     /// Event triggered when a collision is resolved.
     /// </summary>
-    event CollisionResolvedEventHandler? OnCollisionResolved;
+    Event<ICollider2D, CollisionDetectionInformation> OnCollisionResolved { get; }
 
     /// <summary>
     /// Event triggered when another <see cref="ICollider2D"/> triggers this <see cref="ICollider2D"/>.
     /// </summary>
-    event TriggeredEventHandler? OnTriggered;
+    Event<ICollider2D, ICollider2D> OnTriggered { get; }
 
     /// <inheritdoc cref="ITransform2D" />
     ITransform2D Transform { get; }

Engine.Physics2D/Abstract/IPhysicsEngine2D.cs

@@ -1,3 +1,5 @@
+using Syntriax.Engine.Core;
+
 namespace Syntriax.Engine.Physics2D;
 
 /// <summary>
@@ -8,12 +10,12 @@ public interface IPhysicsEngine2D
     /// <summary>
     /// Event triggered when the <see cref="IPhysicsEngine2D"/> has done a single physics iteration.
     /// </summary>
-    event PhysicsIterationEventHandler? OnPhysicsIteration;
+    Event<IPhysicsEngine2D, float> OnPhysicsIteration { get; }
 
     /// <summary>
     /// Event triggered when the <see cref="IPhysicsEngine2D"/> has done a full physics step/>.
     /// </summary>
-    event PhysicsStepEventHandler? OnPhysicsStep;
+    Event<IPhysicsEngine2D, float> OnPhysicsStep { get; }
 
     /// <summary>
     /// The number of iterations the <see cref="IPhysicsEngine2D"/> performs per step.

Engine.Physics2D/Collider2DBehaviourBase.cs

@@ -4,9 +4,9 @@ namespace Syntriax.Engine.Physics2D;
 
 public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
 {
-    public event ICollider2D.CollisionDetectedEventHandler? OnCollisionDetected = null;
+    public Event<ICollider2D, CollisionDetectionInformation> OnCollisionDetected { get; private set; } = new();
-    public event ICollider2D.CollisionResolvedEventHandler? OnCollisionResolved = null;
+    public Event<ICollider2D, CollisionDetectionInformation> OnCollisionResolved { get; private set; } = new();
-    public event ICollider2D.TriggeredEventHandler? OnTriggered = null;
+    public Event<ICollider2D, ICollider2D> OnTriggered { get; private set; } = new();
 
     protected bool NeedsRecalculation { get; set; } = true;
     protected IRigidBody2D? _rigidBody2D = null;
@@ -29,13 +29,13 @@ public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
     {
         BehaviourController.TryGetBehaviourInParent(out _rigidBody2D);
 
-        BehaviourController.OnBehaviourAdded += OnBehaviourAddedToController;
+        BehaviourController.OnBehaviourAdded.AddListener(OnBehaviourAddedToController);
-        BehaviourController.OnBehaviourRemoved += OnBehaviourRemovedFromController;
+        BehaviourController.OnBehaviourRemoved.AddListener(OnBehaviourRemovedFromController);
 
-        Transform.OnPositionChanged += SetNeedsRecalculationFromPosition;
+        Transform.OnPositionChanged.AddListener(SetNeedsRecalculationFromPosition);
-        Transform.OnRotationChanged += SetNeedsRecalculationFromRotation;
+        Transform.OnRotationChanged.AddListener(SetNeedsRecalculationFromRotation);
-        Transform.OnScaleChanged += SetNeedsRecalculationFromScale;
+        Transform.OnScaleChanged.AddListener(SetNeedsRecalculationFromScale);
-        UniverseObject.OnParentChanged += UpdateRigidBody2D;
+        UniverseObject.OnParentChanged.AddListener(UpdateRigidBody2D);
     }
 
     private void UpdateRigidBody2D(IUniverseObject sender, IUniverseObject? previousParent, IUniverseObject? newParent)
@@ -61,12 +61,12 @@ public abstract class Collider2DBehaviourBase : Behaviour2D, ICollider2D
 
     protected override void OnFinalize()
     {
-        BehaviourController.OnBehaviourAdded -= OnBehaviourAddedToController;
+        BehaviourController.OnBehaviourAdded.RemoveListener(OnBehaviourAddedToController);
-        BehaviourController.OnBehaviourRemoved -= OnBehaviourRemovedFromController;
+        BehaviourController.OnBehaviourRemoved.RemoveListener(OnBehaviourRemovedFromController);
-        Transform.OnScaleChanged -= SetNeedsRecalculationFromScale;
+        Transform.OnScaleChanged.RemoveListener(SetNeedsRecalculationFromScale);
 
-        Transform.OnPositionChanged -= SetNeedsRecalculationFromPosition;
+        Transform.OnPositionChanged.RemoveListener(SetNeedsRecalculationFromPosition);
-        Transform.OnRotationChanged -= SetNeedsRecalculationFromRotation;
+        Transform.OnRotationChanged.RemoveListener(SetNeedsRecalculationFromRotation);
     }
 
     public void Detect(CollisionDetectionInformation collisionDetectionInformation) => OnCollisionDetected?.Invoke(this, collisionDetectionInformation);

Engine.Physics2D/PhysicsCoroutineManager.cs

@@ -25,9 +25,9 @@ public class PhysicsCoroutineManager : UniverseObject
     {
         physicsEngine = universe.GetUniverseObject<IPhysicsEngine2D>();
         if (physicsEngine is IPhysicsEngine2D foundPhysicsEngine)
-            foundPhysicsEngine.OnPhysicsStep += OnPhysicsStep;
+            foundPhysicsEngine.OnPhysicsStep.RemoveListener(OnPhysicsStep);
         else
-            universe.OnUpdate += OnUpdate;
+            universe.OnUpdate.AddListener(OnUpdate);
     }
 
     private void OnPhysicsStep(IPhysicsEngine2D sender, float stepDeltaTime)
@@ -45,8 +45,8 @@ public class PhysicsCoroutineManager : UniverseObject
     protected override void OnExitingUniverse(IUniverse universe)
     {
         if (physicsEngine is IPhysicsEngine2D existingPhysicsEngine)
-            existingPhysicsEngine.OnPhysicsStep -= OnPhysicsStep;
+            existingPhysicsEngine.OnPhysicsStep.RemoveListener(OnPhysicsStep);
-        universe.OnUpdate -= OnUpdate;
+        universe.OnUpdate.RemoveListener(OnUpdate);
     }
 
     private void OnUpdate(IUniverse sender, UniverseTime engineTime)
@@ -57,8 +57,8 @@ public class PhysicsCoroutineManager : UniverseObject
         physicsEngine = universe.GetUniverseObject<IPhysicsEngine2D>();
         if (physicsEngine is IPhysicsEngine2D foundPhysicsEngine)
         {
-            foundPhysicsEngine.OnPhysicsStep += OnPhysicsStep;
+            foundPhysicsEngine.OnPhysicsStep.AddListener(OnPhysicsStep);
-            universe.OnUpdate -= OnUpdate;
+            universe.OnUpdate.RemoveListener(OnUpdate);
         }
     }
 }

Engine.Physics2D/PhysicsEngine2D.cs

@@ -4,8 +4,8 @@ namespace Syntriax.Engine.Physics2D;
 
 public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
 {
-    public event IPhysicsEngine2D.PhysicsIterationEventHandler? OnPhysicsIteration = null;
+    public Event<IPhysicsEngine2D, float> OnPhysicsIteration { get; private set; } = new();
-    public event IPhysicsEngine2D.PhysicsStepEventHandler? OnPhysicsStep = null;
+    public Event<IPhysicsEngine2D, float> OnPhysicsStep { get; private set; } = new();
 
     private float physicsTicker = 0f;
     private int _iterationPerStep = 1;
@@ -178,7 +178,7 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
         colliderCollector.Assign(universe);
         rigidBodyCollector.Assign(universe);
 
-        universe.OnPreUpdate += OnEnginePreUpdate;
+        universe.OnPreUpdate.AddListener(OnEnginePreUpdate);
     }
 
     protected override void OnExitingUniverse(IUniverse universe)
@@ -189,7 +189,7 @@ public class PhysicsEngine2D : UniverseObject, IPhysicsEngine2D
         colliderCollector.Unassign();
         rigidBodyCollector.Unassign();
 
-        universe.OnPreUpdate -= OnEnginePreUpdate;
+        universe.OnPreUpdate.RemoveListener(OnEnginePreUpdate);
     }
 
     private void OnEnginePreUpdate(IUniverse sender, UniverseTime engineTime)

Engine.Physics2D/PhysicsEngine2DStandalone.cs

@@ -6,8 +6,8 @@ namespace Syntriax.Engine.Physics2D;
 
 public class PhysicsEngine2DStandalone : IPhysicsEngine2D
 {
-    public event IPhysicsEngine2D.PhysicsIterationEventHandler? OnPhysicsIteration = null;
+    public Event<IPhysicsEngine2D, float> OnPhysicsIteration { get; private set; } = new();
-    public event IPhysicsEngine2D.PhysicsStepEventHandler? OnPhysicsStep = null;
+    public Event<IPhysicsEngine2D, float> OnPhysicsStep { get; private set; } = new();
 
     private readonly List<IRigidBody2D> rigidBodies = new(32);
     private readonly List<ICollider2D> colliders = new(64);
@@ -29,13 +29,16 @@ public class PhysicsEngine2DStandalone : IPhysicsEngine2D
         foreach (ICollider2D collider2D in rigidBody.BehaviourController.GetBehaviours<ICollider2D>())
             colliders.Add(collider2D);
 
-        rigidBody.BehaviourController.OnBehaviourAdded += OnBehaviourAdded;
+        rigidBody.BehaviourController.OnBehaviourAdded.AddListener(OnBehaviourAdded);
-        rigidBody.BehaviourController.OnBehaviourRemoved += OnBehaviourRemoved;
+        rigidBody.BehaviourController.OnBehaviourRemoved.AddListener(OnBehaviourRemoved);
     }
 
     public void RemoveRigidBody(IRigidBody2D rigidBody)
     {
         rigidBodies.Remove(rigidBody);
+
+        rigidBody.BehaviourController.OnBehaviourAdded.RemoveListener(OnBehaviourAdded);
+        rigidBody.BehaviourController.OnBehaviourRemoved.RemoveListener(OnBehaviourRemoved);
     }
 
     public void Step(float deltaTime)

Engine.Systems/StateMachine/State.cs

@@ -10,7 +10,7 @@ public class State : BaseEntity, IState
     public event IState.StateTransitionedFromEventHandler? OnStateTransitionedFrom = null;
     public event IState.StateTransitionedToEventHandler? OnStateTransitionedTo = null;
     public event IState.StateTransitionReadyEventHandler? OnStateTransitionReady = null;
-    public event INameable.NameChangedEventHandler? OnNameChanged = null;
+    public Event<INameable, string> OnNameChanged { get; private set; } = new();
 
     private readonly List<StateTransition> transitions = [];
     private readonly Dictionary<string, StateTransition> possibleTransitions = [];

Engine.Systems/StateMachine/StateBehaviourBase.cs

@@ -7,7 +7,8 @@ public abstract class StateBehaviourBase : Behaviour, IState
     public event IState.StateUpdateEventHandler? OnStateUpdate = null;
     public event IState.StateTransitionedFromEventHandler? OnStateTransitionedFrom = null;
     public event IState.StateTransitionedToEventHandler? OnStateTransitionedTo = null;
-    public event INameable.NameChangedEventHandler? OnNameChanged = null;
+
+    public Event<INameable, string> OnNameChanged { get; private set; } = new();
 
     public abstract event IState.StateTransitionReadyEventHandler? OnStateTransitionReady;