IsoHolder and IsoInstance improvements

Assets/IsoTools/Scripts/Internal/IsoBehaviour.cs

@@ -0,0 +1,47 @@
+using UnityEngine;
+
+namespace IsoTools.Internal {
+	public abstract class IsoBehaviour<T> : MonoBehaviour
+		where T : IsoBehaviour<T>
+	{
+		static IsoAssocList<T> _behaviours = new IsoAssocList<T>();
+
+		// ---------------------------------------------------------------------
+		//
+		// Internal
+		//
+		// ---------------------------------------------------------------------
+
+		public bool IsActive() {
+			return isActiveAndEnabled && gameObject.activeInHierarchy;
+		}
+
+		protected static int AllBehaviourCount {
+			get { return _behaviours.Count; }
+		}
+
+		protected static T GetBehaviourByIndex(int index) {
+			return _behaviours[index];
+		}
+
+		// ---------------------------------------------------------------------
+		//
+		// Virtual
+		//
+		// ---------------------------------------------------------------------
+
+		protected virtual void OnEnable() {
+			var behaviour = this as T;
+			if ( behaviour && behaviour.IsActive() ) {
+				_behaviours.Add(behaviour);
+			}
+		}
+
+		protected virtual void OnDisable() {
+			var behaviour = this as T;
+			if ( behaviour ) {
+				_behaviours.Remove(behaviour);
+			}
+		}
+	}
+}