feat: Added Engine Cycles to GameManager

Engine.Core/GameManager.cs

@@ -1,7 +1,5 @@
-using System;
-using System.Collections.Generic;
-
 using Microsoft.Xna.Framework;
+using Microsoft.Xna.Framework.Graphics;
 
 using Syntriax.Engine.Core.Abstract;
 using Syntriax.Engine.Core.Factory;
@@ -10,8 +8,8 @@ namespace Syntriax.Engine.Core;
 
 public class GameManager
 {
-    public Game Game { get; private 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 GameObjectFactory _gameObjectFactory = null!;
     private GameObjectFactory GameObjectFactory
@@ -31,32 +29,95 @@ public class GameManager
         if (_gameObjects.Contains(gameObject))
             throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is already registered to the {nameof(GameManager)}.");
 
-        _gameObjects.Add(gameObject);
+        Register(gameObject);
     }
 
     public T InstantiateGameObject<T>(params object?[]? args) where T : class, IGameObject
     {
         T gameObject = GameObjectFactory.Instantiate<T>(args);
-        _gameObjects.Add(gameObject);
+        Register(gameObject);
         return gameObject;
     }
 
-    // public TGameObject RegisterGameObject<TGameObject, TTransform, TBehaviourController, TStateEnable>()
+    public IGameObject RemoveGameObject(IGameObject gameObject)
-    //     where TGameObject : class, IGameObject
-    //     where TTransform : class, ITransform
-    //     where TBehaviourController : class, IBehaviourController
-    //     where TStateEnable : class, IStateEnable
-    // {
-    //     TGameObject gameObject = Factory.GameObjectFactory.Get<TGameObject>();
-    //     _gameObjects.Add(gameObject);
-    //     return gameObject;
-    // }
-
-    public void RemoveGameObject(IGameObject gameObject)
     {
         if (!_gameObjects.Contains(gameObject))
             throw new Exception($"{nameof(IGameComponent)} named {gameObject.Name} is not registered to the {nameof(GameManager)}.");
 
+        Unregister(gameObject);
+        return gameObject;
+    }
+
+    public void Initialize()
+    {
+        foreach (var gameObject in GameObjects)
+            gameObject.Initialize();
+    }
+
+    public void Update(GameTime time)
+    {
+        foreach (var gameObject in GameObjects)
+            gameObject.BehaviourController.Update(time);
+    }
+
+    public void PreDraw(GameTime time)
+    {
+        foreach (var gameObject in GameObjects)
+            gameObject.BehaviourController.UpdatePreDraw(time);
+    }
+
+    public void Draw(SpriteBatch spriteBatch)
+    {
+        spriteBatch.Begin();
+
+        foreach (var gameObject in GameObjects)
+            if (gameObject.BehaviourController.TryGetBehaviour<Behaviours.IDrawBehaviour>(out var drawable))
+                drawable.Draw(spriteBatch);
+
+        spriteBatch.End();
+    }
+
+    /////////////////////////////////////////////////////////////////
+
+    private void Unregister(IGameObject gameObject)
+    {
+        gameObject.BehaviourController.OnBehaviourAdded -= OnBehaviourAdd;
+        gameObject.BehaviourController.OnBehaviourRemoved -= OnBehaviourRemove;
+        gameObject.OnFinalized -= OnGameObjectFinalize;
+
+        if (gameObject.BehaviourController.TryGetBehaviour<IDrawable>(out var drawable))
+            _drawables.Remove(drawable);
+
         _gameObjects.Remove(gameObject);
     }
+
+    private void Register(IGameObject gameObject)
+    {
+        gameObject.BehaviourController.OnBehaviourAdded += OnBehaviourAdd;
+        gameObject.BehaviourController.OnBehaviourRemoved += OnBehaviourRemove;
+        gameObject.OnFinalized += OnGameObjectFinalize;
+
+        if (gameObject.BehaviourController.TryGetBehaviour<IDrawable>(out var drawable))
+            _drawables.Add(drawable);
+
+        _gameObjects.Add(gameObject);
+    }
+
+    private void OnGameObjectFinalize(IInitialize initialize)
+    {
+        if (initialize is IGameObject gameObject)
+            Unregister(gameObject);
+    }
+
+    private void OnBehaviourAdd(IBehaviourController controller, IBehaviour behaviour)
+    {
+        if (behaviour is IDrawable drawable)
+            _drawables.Add(drawable);
+    }
+
+    private void OnBehaviourRemove(IBehaviourController controller, IBehaviour behaviour)
+    {
+        if (behaviour is IDrawable drawable)
+            _drawables.Remove(drawable);
+    }
 }

Engine.Core/Static/Internal/Constants.cs

@@ -7,4 +7,5 @@ internal static class Constants
 {
     internal static int BEHAVIOURS_SIZE_INITIAL = 16;
     internal static int GAME_OBJECTS_SIZE_INITIAL = 256;
+    internal static int DRAWABLE_OBJECTS_SIZE_INITIAL = 256;
 }