Editor stuff

Assets/Plugins/com.unity.uiextensions/Runtime/Scripts/Utilities/UIScrollToSelectionXY.cs

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+/// Credit zero3growlithe
+/// sourced from: http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-2011648
+/// Update by xesenix - based on UIScrollToSelection centers on selected element in scrollrect which can move in XY 
+///		you can restrict movement by locking axis on ScrollRect component
+
+/*USAGE:
+Simply place the script on the ScrollRect that contains the selectable children we'll be scrolling to
+and drag'n'drop the RectTransform of the options "container" that we'll be scrolling.*/
+
+using UnityEngine.EventSystems;
+
+namespace UnityEngine.UI.Extensions
+{
+    [AddComponentMenu("UI/Extensions/UI ScrollTo Selection XY")]
+    [RequireComponent(typeof(ScrollRect))]
+    public class UIScrollToSelectionXY : MonoBehaviour
+    {
+
+        #region Variables
+
+        // settings
+        public float scrollSpeed = 10f;
+
+        [SerializeField]
+        private RectTransform layoutListGroup = null;
+
+        // temporary variables
+        private RectTransform targetScrollObject;
+        private bool scrollToSelection = true;
+
+        // references
+        private RectTransform scrollWindow = null;
+        private ScrollRect targetScrollRect = null;
+        #endregion
+
+        // Use this for initialization
+        private void Start()
+        {
+            targetScrollRect = GetComponent<ScrollRect>();
+            scrollWindow = targetScrollRect.GetComponent<RectTransform>();
+        }
+
+        // Update is called once per frame
+        private void Update()
+        {
+            ScrollRectToLevelSelection();
+        }
+
+        private void ScrollRectToLevelSelection()
+        {
+			// FIX: if you do not do that here events can have null value
+			var events = EventSystem.current;
+
+            // check main references
+            bool referencesAreIncorrect =
+                (targetScrollRect == null || layoutListGroup == null || scrollWindow == null);
+            if (referencesAreIncorrect == true)
+            {
+                return;
+            }
+
+            // get calculation references
+            RectTransform selection = events.currentSelectedGameObject != null ?
+                events.currentSelectedGameObject.GetComponent<RectTransform>() :
+                null;
+
+            if (selection != targetScrollObject)
+			{
+				scrollToSelection = true;
+			}
+
+            // check if scrolling is possible
+            bool isScrollDirectionUnknown = (selection == null || scrollToSelection == false);
+
+            if (isScrollDirectionUnknown == true || selection.transform.parent != layoutListGroup.transform)
+			{
+				return;
+			}
+
+			bool finishedX = false, finishedY = false;
+            
+			if (targetScrollRect.vertical)
+			{
+				// move the current scroll rect to correct position
+				float selectionPos = -selection.anchoredPosition.y;
+
+				float listPixelAnchor = layoutListGroup.anchoredPosition.y;
+
+				// get the element offset value depending on the cursor move direction
+				float offlimitsValue = 0;
+
+				offlimitsValue = listPixelAnchor - selectionPos;
+				// move the target scroll rect
+				targetScrollRect.verticalNormalizedPosition += (offlimitsValue / layoutListGroup.sizeDelta.y) * Time.deltaTime * scrollSpeed;
+
+				finishedY = Mathf.Abs(offlimitsValue) < 2f;
+			}
+
+			if (targetScrollRect.horizontal)
+			{
+				// move the current scroll rect to correct position
+				float selectionPos = -selection.anchoredPosition.x;
+
+				float listPixelAnchor = layoutListGroup.anchoredPosition.x;
+				
+				// get the element offset value depending on the cursor move direction
+				float offlimitsValue = 0;
+				
+				offlimitsValue = listPixelAnchor - selectionPos;
+				// move the target scroll rect
+				targetScrollRect.horizontalNormalizedPosition += (offlimitsValue / layoutListGroup.sizeDelta.x) * Time.deltaTime * scrollSpeed;
+
+				finishedX = Mathf.Abs(offlimitsValue) < 2f;
+			}
+			// check if we reached our destination
+			if (finishedX && finishedY) {
+				scrollToSelection = false;
+			}
+            // save last object we were "heading to" to prevent blocking
+            targetScrollObject = selection;
+        }
+    }
+}