Merged in zhdiv/unity-ui-extensions-i1 (pull request #35)

Master

Approved-by: Simon Jackson <darkside@xna-uk.net>

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;
             }
         }

Scripts/Utilities/ExtentionMethods.cs

@@ -0,0 +1,15 @@
+namespace UnityEngine.UI.Extensions
+{
+    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;
+        }
+    }
+}

Scripts/Utilities/ExtentionMethods.cs.meta

@@ -0,0 +1,11 @@
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