4 files changed, 95 insertions, 0 deletions
diff --git a/Assets/UI_Extension/Scripts/Utilities/ListPool.cs b/Assets/UI_Extension/Scripts/Utilities/ListPool.cs
new file mode 100644
index 0000000..774d55c
--- /dev/null
+++ b/Assets/UI_Extension/Scripts/Utilities/ListPool.cs
@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace UIExt
+{
+
+    internal static class ListPool<T>
+    {
+        // Object pool to avoid allocations.
+        private static readonly ObjectPool<List<T>> s_ListPool = new ObjectPool<List<T>>(null, l => l.Clear());
+
+        public static List<T> Get()
+        {
+            return s_ListPool.Get();
+        }
+
+        public static void Release(List<T> toRelease)
+        {
+            s_ListPool.Release(toRelease);
+        }
+    }
+}
diff --git a/Assets/UI_Extension/Scripts/Utilities/ListPool.cs.meta b/Assets/UI_Extension/Scripts/Utilities/ListPool.cs.meta
new file mode 100644
index 0000000..9f8bf39
--- /dev/null
+++ b/Assets/UI_Extension/Scripts/Utilities/ListPool.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c0ddf6384711d3e4489db520510ac43a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs b/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs
new file mode 100644
index 0000000..f1db3ec
--- /dev/null
+++ b/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs
@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using UnityEngine.Events;
+using UnityEngine;
+
+namespace UIExt
+{
+
+    internal class ObjectPool<T> where T : new()
+    {
+        private readonly Stack<T> m_Stack = new Stack<T>();
+        private readonly UnityAction<T> m_ActionOnGet;
+        private readonly UnityAction<T> m_ActionOnRelease;
+
+        public int countAll { get; private set; }
+        public int countActive { get { return countAll - countInactive; } }
+        public int countInactive { get { return m_Stack.Count; } }
+
+        public ObjectPool(UnityAction<T> actionOnGet, UnityAction<T> actionOnRelease)
+        {
+            m_ActionOnGet = actionOnGet;
+            m_ActionOnRelease = actionOnRelease;
+        }
+
+        public T Get()
+        {
+            T element;
+            if (m_Stack.Count == 0)
+            {
+                element = new T();
+                countAll++;
+            }
+            else
+            {
+                element = m_Stack.Pop();
+            }
+            if (m_ActionOnGet != null)
+                m_ActionOnGet(element);
+            return element;
+        }
+
+        public void Release(T element)
+        {
+            if (m_Stack.Count > 0 && ReferenceEquals(m_Stack.Peek(), element))
+                Debug.LogError("Internal error. Trying to destroy object that is already released to pool.");
+            if (m_ActionOnRelease != null)
+                m_ActionOnRelease(element);
+            m_Stack.Push(element);
+        }
+    }
+}
diff --git a/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs.meta b/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs.meta
new file mode 100644
index 0000000..5fe9f8d
--- /dev/null
+++ b/Assets/UI_Extension/Scripts/Utilities/ObjectPool.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 75cc36573df9c1a4fa34a095a99d7eeb
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: