StateMachine Component

src/Components/Logic/StateMachine.bf

@@ -0,0 +1,137 @@
+using System;
+using System.Collections;
+
+namespace Strawberry
+{
+	public class StateMachine<TIndex> : Component where TIndex : struct, IHashable
+	{
+		private Dictionary<TIndex, State> states = new Dictionary<TIndex, State>() ~ delete _;
+		private TIndex state;
+		private bool inStateCall;
+
+		public TIndex PreviousState { get; private set; }
+		public TIndex NextState { get; private set; }
+
+		public this(TIndex startState)
+			: base(true, false)
+		{
+			NextState = PreviousState = state = startState;
+		}
+
+		public ~this()
+		{
+			for (let s in states.Values)
+				 delete s;
+		}
+
+		public override void Started()
+		{
+			CallEnter();
+		}
+
+		public override void Update()
+		{
+			CallUpdate();
+		}
+
+		public override void Draw()
+		{
+
+		}
+
+		public void Add(TIndex state, delegate TIndex() enter = null, delegate TIndex() update = null, delegate TIndex() exit = null)
+		{
+			let s = new State();
+			s.Enter = enter;
+			s.Update = update;
+			s.Exit = exit;
+			states[state] = s;
+		}
+
+		public TIndex State
+		{
+			get => state;
+			set => Set(value);
+		}
+
+		private Result<bool> Set(TIndex to)
+		{
+			if (inStateCall)
+				Runtime.FatalError("Cannot set State directly from inside a State Enter/Exit/Update call. Return the desired State change instead.");
+
+			if (to != state)
+			{
+				NextState = to;
+				if (CallExit())
+					return true;
+
+				PreviousState = state;
+				state = to;
+
+				CallEnter();
+				return true;
+			}
+			else
+				return false;
+		}
+
+		private bool CallEnter()
+		{
+			let s = states[state];
+			if (s != null)
+			{
+				inStateCall = true;
+				let set = s.Enter();
+				inStateCall = false;
+				return Set(set);
+			}
+			else
+				return false;
+		}
+
+		private bool CallUpdate()
+		{
+			let s = states[state];
+			if (s != null)
+			{
+				inStateCall = true;
+				let set = s.Update();
+				inStateCall = false;
+				return Set(set);
+			}
+			else
+				return false;
+		}
+
+		private bool CallExit()
+		{
+			let s = states[state];
+			if (s != null)
+			{
+				inStateCall = true;
+				let set = s.Exit();
+				inStateCall = false;
+				return Set(set);
+			}
+			else
+				return false;
+		}
+
+		public class State
+		{
+			public delegate TIndex() Enter;
+			public delegate TIndex() Update;
+			public delegate TIndex() Exit;
+
+			public ~this()
+			{
+				if (Enter != null)
+					delete Enter;
+				if (Update != null)
+					delete Update;
+				if (Exit != null)
+					delete Exit;
+			}
+		}
+	}
+}

src/Components/Logic/Timer.bf

@@ -24,6 +24,33 @@ namespace Strawberry
 			RemoveOnComplete = destroyOnComplete;
 		}
 
+		public override void Started()
+		{
+
+		}
+
+		public override void Update()
+		{
+			if (value > 0)
+			{
+				value -= Time.Delta;
+				if (value <= 0)
+				{
+					value = 0;
+					Active = false;
+
+					OnComplete?.Invoke();
+					if (RemoveOnComplete)
+						RemoveSelf();
+				}
+			}
+		}
+
+		public override void Draw()
+		{
+
+		}
+
 		public float Value
 		{
 			[Inline]
@@ -47,23 +74,6 @@ namespace Strawberry
 			Active = false;
 		}
 
-		public override void Update()
-		{
-			if (value > 0)
-			{
-				value -= Time.Delta;
-				if (value <= 0)
-				{
-					value = 0;
-					Active = false;
-
-					OnComplete?.Invoke();
-					if (RemoveOnComplete)
-						RemoveSelf();
-				}
-			}
-		}
-
 		static public implicit operator bool(Timer timer)
 		{
 			return timer.value > 0;

src/Core/Component.bf

@@ -15,30 +15,19 @@ namespace Strawberry
 			Visible = visible;
 		}
 
-		public void	Added(Entity entity)
+		private void Added(Entity entity)
 		{
 			Entity = entity;
 		}
 
-		public void Removed()
+		private void Removed()
 		{
 			Entity = null;
 		}
 
-		public virtual void Started()
-		{
-
-		}
-
-		public virtual void Update()
-		{
-
-		}
-
-		public virtual void Draw()
-		{
-
-		}
+		public abstract void Started();
+		public abstract void Update();
+		public abstract void Draw();
 
 		[Inline]
 		public void RemoveSelf()

src/Core/Entity.bf

@@ -89,7 +89,7 @@ namespace Strawberry
 				{
 					components.Remove(c);
 					Scene.[Friend]UntrackComponent(c);
-					c.Removed();
+					c.[Friend]Removed();
 					delete c;
 				}
 
@@ -102,7 +102,7 @@ namespace Strawberry
 				{
 					components.Add(c);
 					Scene.[Friend]TrackComponent(c);
-					c.Added(this);
+					c.[Friend]Added(this);
 				}
 
 				toAdd.Clear();

src/Physics/Actor.bf

@@ -39,7 +39,6 @@ namespace Strawberry
 		public override void Update()
 		{
 			base.Update();
-
 			MovedByGeometry = Point.Zero;
 		}