Insanely huge initial commit

Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMPersistentHumbleSingleton.cs

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+using UnityEngine;
+using System;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// Persistent humble singleton, basically a classic singleton but will destroy any other older components of the same type it finds on awake
+	/// </summary>
+	public class MMPersistentHumbleSingleton<T> : MonoBehaviour	where T : Component
+	{
+		/// whether or not this singleton already has an instance 
+		public static bool HasInstance => _instance != null;
+		public static T Current => _instance;
+		
+		protected static T _instance;
+		
+		/// the timestamp at which this singleton got initialized
+		[MMReadOnly]
+		public float InitializationTime;
+
+		/// <summary>
+		/// Singleton design pattern
+		/// </summary>
+		/// <value>The instance.</value>
+		public static T Instance
+		{
+			get
+			{
+				if (_instance == null)
+				{
+					_instance = FindObjectOfType<T> ();
+					if (_instance == null)
+					{
+						GameObject obj = new GameObject ();
+						obj.hideFlags = HideFlags.HideAndDontSave;
+						obj.name = typeof(T).Name + "_AutoCreated";
+						_instance = obj.AddComponent<T> ();
+					}
+				}
+				return _instance;
+			}
+		}
+
+		/// <summary>
+		/// On awake, we check if there's already a copy of the object in the scene. If there's one, we destroy it.
+		/// </summary>
+		protected virtual void Awake ()
+		{
+			InitializeSingleton();			
+		}
+
+		/// <summary>
+		/// Initializes the singleton.
+		/// </summary>
+		protected virtual void InitializeSingleton()
+		{
+			if (!Application.isPlaying)
+			{
+				return;
+			}
+			
+			InitializationTime = Time.time;
+
+			DontDestroyOnLoad (this.gameObject);
+			// we check for existing objects of the same type
+			T[] check = FindObjectsOfType<T>();
+			foreach (T searched in check)
+			{
+				if (searched!=this)
+				{
+					// if we find another object of the same type (not this), and if it's older than our current object, we destroy it.
+					if (searched.GetComponent<MMPersistentHumbleSingleton<T>>().InitializationTime < InitializationTime)
+					{
+						Destroy (searched.gameObject);
+					}
+				}
+			}
+
+			if (_instance == null)
+			{
+				_instance = this as T;
+			}
+		}
+	}
+}

Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMPersistentHumbleSingleton.cs.meta

@@ -0,0 +1,8 @@
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Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMPersistentSingleton.cs

@@ -0,0 +1,84 @@
+using UnityEngine;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// Persistent singleton.
+	/// </summary>
+	public class MMPersistentSingleton<T> : MonoBehaviour	where T : Component
+	{
+		[Header("Persistent Singleton")]
+		/// if this is true, this singleton will auto detach if it finds itself parented on awake
+		[Tooltip("if this is true, this singleton will auto detach if it finds itself parented on awake")]
+		public bool AutomaticallyUnparentOnAwake = true;
+		
+		public static bool HasInstance => _instance != null;
+		public static T Current => _instance;
+		
+		protected static T _instance;
+		protected bool _enabled;
+
+		/// <summary>
+		/// Singleton design pattern
+		/// </summary>
+		/// <value>The instance.</value>
+		public static T Instance
+		{
+			get
+			{
+				if (_instance == null)
+				{
+					_instance = FindObjectOfType<T> ();
+					if (_instance == null)
+					{
+						GameObject obj = new GameObject ();
+						obj.name = typeof(T).Name + "_AutoCreated";
+						_instance = obj.AddComponent<T> ();
+					}
+				}
+				return _instance;
+			}
+		}
+
+		/// <summary>
+		/// On awake, we check if there's already a copy of the object in the scene. If there's one, we destroy it.
+		/// </summary>
+		protected virtual void Awake ()
+		{
+			InitializeSingleton();
+		}
+
+		/// <summary>
+		/// Initializes the singleton.
+		/// </summary>
+		protected virtual void InitializeSingleton()
+		{
+			if (!Application.isPlaying)
+			{
+				return;
+			}
+
+			if (AutomaticallyUnparentOnAwake)
+			{
+				this.transform.SetParent(null);
+			}
+
+			if (_instance == null)
+			{
+				//If I am the first instance, make me the Singleton
+				_instance = this as T;
+				DontDestroyOnLoad (transform.gameObject);
+				_enabled = true;
+			}
+			else
+			{
+				//If a Singleton already exists and you find
+				//another reference in scene, destroy it!
+				if(this != _instance)
+				{
+					Destroy(this.gameObject);
+				}
+			}
+		}
+	}
+}

Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMPersistentSingleton.cs.meta

@@ -0,0 +1,8 @@
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Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMReferencedScriptableObject.cs

@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// Auto-referenced ScriptableObject instances of type T
+	/// An example usage for ReferenceHolder<T> that can be used with any class type
+	/// </summary>
+	public class MMReferencedScriptableObject<T> : ScriptableObject where T : ScriptableObject
+	{
+		private MMReferenceHolder<T> _instances;
+		protected virtual T Typed => _typed = _typed ?? this as T; private T _typed;
+
+		protected virtual void OnReferenced() {}
+		protected virtual void OnEnable()
+		{
+			_instances.Reference(Typed);
+			OnReferenced();
+			// Debug.Log(ReferenceHolder<T>.Any != null, this);
+		}
+
+		protected virtual void OnDisposed() {}
+		protected virtual void OnDisable()
+		{
+			_instances.Dispose();
+			OnDisposed();
+			// Debug.Log(ReferenceHolder<T>.Any != null);
+		}
+	}
+
+	// using WeakReference to let GC collect those once Engine does not use them anymore
+	public struct MMReferenceHolder<T> : IDisposable where T : class
+	{
+		private static List<WeakReference<T>> _instances = new List<WeakReference<T>>(2);
+
+		private WeakReference<T> _instance;
+		public void Reference(T instance, bool cleanUp = false)
+		{
+			_instances = _instances ?? new List<WeakReference<T>>(1);
+			if(cleanUp) CleanUp();
+			if (instance != null)
+			{
+				_instance = new WeakReference<T>(instance);
+				_instances.Add(_instance); // always adding at the end, to keep it cheap, do a CleanUp if needed
+			}
+		}
+		public void Dispose()
+		{
+			if (_instance != null) _instances?.Remove(_instance);
+		}
+
+		public static void CleanUp() => RepackNonNullReferences();
+		static void RepackNonNullReferences()
+		{
+			if (_instances == null) return;
+			for(int n=_instances.Count-1; n >=0; --n)
+			{
+				if (!_instances[n].TryGetTarget(out T target))
+				{
+					_instances.RemoveAt(n);
+				}
+			}
+		}
+
+		public static T Any => _instances != null && _instances.Count > 0 && _instances[0].TryGetTarget(out T target) ? target : null;
+		public static IEnumerator<T> All
+		{
+			get
+			{
+				if (_instances == null) yield break;
+				foreach (var inst in _instances)
+				{
+					if (inst.TryGetTarget(out T target))
+					{
+						yield return target;
+					}
+				}
+			}
+		}
+		
+		public static T First(System.Func<T,bool> selector)
+		{
+			if (_instances == null) return null;
+			if (selector == null) return Any;
+			foreach (var inst in _instances)
+			{
+				if (inst.TryGetTarget(out T target) && selector(target))
+				{
+					return target;
+				}
+			}
+			return null;
+		}
+	}
+}

Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMReferencedScriptableObject.cs.meta

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Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMSingleton.cs

@@ -0,0 +1,58 @@
+using UnityEngine;
+
+namespace MoreMountains.Tools
+{
+	/// <summary>
+	/// Singleton pattern.
+	/// </summary>
+	public class MMSingleton<T> : MonoBehaviour	where T : Component
+	{
+		protected static T _instance;
+		public static bool HasInstance => _instance != null;
+		public static T TryGetInstance() => HasInstance ? _instance : null;
+		public static T Current => _instance;
+
+		/// <summary>
+		/// Singleton design pattern
+		/// </summary>
+		/// <value>The instance.</value>
+		public static T Instance
+		{
+			get
+			{
+				if (_instance == null)
+				{
+					_instance = FindObjectOfType<T> ();
+					if (_instance == null)
+					{
+						GameObject obj = new GameObject ();
+						obj.name = typeof(T).Name + "_AutoCreated";
+						_instance = obj.AddComponent<T> ();
+					}
+				}
+				return _instance;
+			}
+		}
+
+		/// <summary>
+		/// On awake, we initialize our instance. Make sure to call base.Awake() in override if you need awake.
+		/// </summary>
+		protected virtual void Awake ()
+		{
+			InitializeSingleton();		
+		}
+	    
+		/// <summary>
+		/// Initializes the singleton.
+		/// </summary>
+		protected virtual void InitializeSingleton()
+		{
+			if (!Application.isPlaying)
+			{
+				return;
+			}
+
+			_instance = this as T;
+		}
+	}
+}

Assets/Extensions/Feel/MMTools/Tools/MMSingletons/MMSingleton.cs.meta

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