feat: Implemented IInitialize on GameManager

Engine.Core/Engine.Core.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.002.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Engine.Core", "Engine.Core.csproj", "{6C1AF4B1-60B0-4225-9A96-F597BC04E9D0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{6C1AF4B1-60B0-4225-9A96-F597BC04E9D0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6C1AF4B1-60B0-4225-9A96-F597BC04E9D0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6C1AF4B1-60B0-4225-9A96-F597BC04E9D0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6C1AF4B1-60B0-4225-9A96-F597BC04E9D0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {CC449885-B99C-4C71-842D-3C19A35E786F}
+	EndGlobalSection
+EndGlobal

Engine.Core/GameManager.cs

@@ -6,12 +6,20 @@ using Syntriax.Engine.Core.Factory;
 
 namespace Syntriax.Engine.Core;
 
-public class GameManager
+public class GameManager : IInitialize
 {
+    public Action<IInitialize>? OnInitialized { get; set; } = null;
+    public Action<IInitialize>? OnFinalized { get; set; } = null;
+    public Action<IAssignableStateEnable>? OnStateEnableAssigned { get; set; } = null;
+
+
     private IList<IGameObject> _gameObjects = new List<IGameObject>(Constants.GAME_OBJECTS_SIZE_INITIAL);
     private IList<IDrawable> _drawables = new List<IDrawable>(Constants.DRAWABLE_OBJECTS_SIZE_INITIAL);
 
+    private IStateEnable _stateEnable = null!;
     private GameObjectFactory _gameObjectFactory = null!;
+    private bool _initialized = false;
+
     private GameObjectFactory GameObjectFactory
     {
         get
@@ -22,7 +30,9 @@ public class GameManager
         }
     }
 
+    public bool Initialized => _initialized;
     public IList<IGameObject> GameObjects => _gameObjects;
+    public IStateEnable StateEnable { get { if (_stateEnable is null) Assign(new StateEnableFactory().Instantiate(this)); return _stateEnable; } }
 
     public void RegisterGameObject(IGameObject gameObject)
     {
@@ -48,10 +58,38 @@ public class GameManager
         return gameObject;
     }
 
-    public void Initialize()
+    public bool Initialize()
     {
+        if (Initialized)
+            return false;
+
         foreach (var gameObject in GameObjects)
             gameObject.Initialize();
+
+        OnInitialized?.Invoke(this);
+        return true;
+    }
+
+    public bool Finalize()
+    {
+        if (!Initialized)
+            return false;
+
+        for (int i = GameObjects.Count; i >= 0; i--)
+            GameObjects[i].Finalize();
+
+        OnFinalized?.Invoke(this);
+        return true;
+    }
+
+    public bool Assign(IStateEnable stateEnable)
+    {
+        if (_stateEnable is not null)
+            return false;
+
+        _stateEnable = stateEnable;
+        OnStateEnableAssigned?.Invoke(this);
+        return true;
     }
 
     public void Update(GameTime time)