Editor stuff

Assets/Plugins/com.unity.uiextensions/Runtime/Scripts/MenuSystem/Menu.cs

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+/// Credit Adam Kapos (Nezz) - http://www.songarc.net
+/// Sourced from - https://github.com/YousicianGit/UnityMenuSystem
+/// Updated by SimonDarksideJ - Refactored to be a more generic component
+
+
+namespace UnityEngine.UI.Extensions
+{
+    public abstract class Menu<T> : Menu where T : Menu<T>
+    {
+        public static T Instance { get; private set; }
+
+
+        protected virtual void Awake()
+        {
+            Instance = (T)this;
+        }
+
+        protected virtual void OnDestroy()
+        {
+            Instance = null;
+        }
+
+        protected static void Open()
+        {
+            GameObject clonedGameObject = null;
+            if (Instance == null)
+            {
+                MenuManager.Instance.CreateInstance(typeof(T).Name, out clonedGameObject);
+                MenuManager.Instance.OpenMenu(clonedGameObject.GetMenu());
+            }
+            else
+            {
+                Instance.gameObject.SetActive(true);
+                MenuManager.Instance.OpenMenu(Instance);
+            }
+        }
+
+        protected static void Close()
+        {
+            if (Instance == null)
+            {
+                Debug.LogErrorFormat("Trying to close menu {0} but Instance is null", typeof(T));
+                return;
+            }
+
+            MenuManager.Instance.CloseMenu(Instance);
+        }
+
+        public override void OnBackPressed()
+        {
+            Close();
+        }
+    }
+
+    public abstract class Menu : MonoBehaviour
+    {
+        [Tooltip("Destroy the Game Object when menu is closed (reduces memory usage)")]
+        public bool DestroyWhenClosed = true;
+
+        [Tooltip("Disable menus that are under this one in the stack")]
+        public bool DisableMenusUnderneath = true;
+
+        public abstract void OnBackPressed();
+    }
+}