From 16df45eea30cd597de8fccbbb2092c74aa2423bd Mon Sep 17 00:00:00 2001
From: i1 <leviniarened@gmail.com>
Date: Thu, 4 Oct 2018 00:19:56 +0300
Subject: [PATCH] fixed adding component ScrollSnapScrollbarHelper multiple
 times

---
 Scripts/Layout/ScrollSnap.cs               |  5 +++--
 Scripts/Utilities/ExtentionMethods.cs      | 14 ++++++++++++++
 Scripts/Utilities/ExtentionMethods.cs.meta | 11 +++++++++++
 3 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 Scripts/Utilities/ExtentionMethods.cs
 create mode 100644 Scripts/Utilities/ExtentionMethods.cs.meta

diff --git a/Scripts/Layout/ScrollSnap.cs b/Scripts/Layout/ScrollSnap.cs
index 0d93a28..b7f8b68 100644
--- a/Scripts/Layout/ScrollSnap.cs
+++ b/Scripts/Layout/ScrollSnap.cs
@@ -136,12 +136,13 @@ namespace UnityEngine.UI.Extensions
             }
             if (_scroll_rect.horizontalScrollbar != null && _scroll_rect.horizontal)
             {
-                var hscroll = _scroll_rect.horizontalScrollbar.gameObject.AddComponent<ScrollSnapScrollbarHelper>();
+                
+                   var hscroll = _scroll_rect.horizontalScrollbar.gameObject.GetOrAddComponent<ScrollSnapScrollbarHelper>();
                 hscroll.ss = this;
             }
             if (_scroll_rect.verticalScrollbar != null && _scroll_rect.vertical)
             {
-                var vscroll = _scroll_rect.verticalScrollbar.gameObject.AddComponent<ScrollSnapScrollbarHelper>();
+                var vscroll = _scroll_rect.verticalScrollbar.gameObject.GetOrAddComponent<ScrollSnapScrollbarHelper>();
                 vscroll.ss = this;
             }
         }
diff --git a/Scripts/Utilities/ExtentionMethods.cs b/Scripts/Utilities/ExtentionMethods.cs
new file mode 100644
index 0000000..68220c4
--- /dev/null
+++ b/Scripts/Utilities/ExtentionMethods.cs
@@ -0,0 +1,14 @@
+using UnityEngine;
+
+public static class ExtentionMethods
+{
+    public static T GetOrAddComponent<T>(this GameObject child) where T : Component
+    {
+        T result = child.GetComponent<T>();
+        if (result == null)
+        {
+            result = child.AddComponent<T>();
+        }
+        return result;
+    }
+}
diff --git a/Scripts/Utilities/ExtentionMethods.cs.meta b/Scripts/Utilities/ExtentionMethods.cs.meta
new file mode 100644
index 0000000..cfa1894
--- /dev/null
+++ b/Scripts/Utilities/ExtentionMethods.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ed85e09a894358f4782be8df50a1221a
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: