Editor stuff

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

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+using System.Collections.Generic;
+/// Credit Brogan King (@BroganKing)
+/// Original Sourced from - https://bitbucket.org/UnityUIExtensions/unity-ui-extensions/issues/158/pagination-script
+
+using System.Linq;
+
+namespace UnityEngine.UI.Extensions
+{
+    [AddComponentMenu("UI/Extensions/Pagination Manager")]
+    public class PaginationManager : ToggleGroup
+    {
+        private List<Toggle> m_PaginationChildren;
+
+        [SerializeField]
+        private ScrollSnapBase scrollSnap = null;
+
+        private bool isAClick;
+
+        public int CurrentPage
+        {
+            get { return scrollSnap.CurrentPage; }
+        }
+
+        protected PaginationManager()
+        { }
+
+
+        // Use this for initialization
+        protected override void Start()
+        {
+            base.Start();
+
+            if (scrollSnap == null)
+            {
+                Debug.LogError("A ScrollSnap script must be attached");
+                return;
+            }
+
+            // do not want the scroll snap pagination
+            if (scrollSnap.Pagination)
+                scrollSnap.Pagination = null;
+
+            // set scroll snap listeners
+            scrollSnap.OnSelectionPageChangedEvent.AddListener(SetToggleGraphics);
+            scrollSnap.OnSelectionChangeEndEvent.AddListener(OnPageChangeEnd);
+
+            ResetPaginationChildren();
+        }
+
+        /// <summary>
+        /// Remake the internal list of child toggles (m_PaginationChildren).
+        /// Used after adding/removing a toggle.
+        /// </summary>
+        public void ResetPaginationChildren()
+        {
+             // add selectables to list
+            m_PaginationChildren = GetComponentsInChildren<Toggle>().ToList<Toggle>();
+            for (int i = 0; i < m_PaginationChildren.Count; i++)
+            {
+                m_PaginationChildren[i].onValueChanged.AddListener(ToggleClick);
+                m_PaginationChildren[i].group = this;
+                m_PaginationChildren[i].isOn = false;
+            }
+
+            // set toggles on start
+            SetToggleGraphics(CurrentPage);
+
+            // warn user that they have uneven amount of pagination toggles to page count
+            if (m_PaginationChildren.Count != scrollSnap._scroll_rect.content.childCount)
+                Debug.LogWarning("Uneven pagination icon to page count");
+        }
+
+        /// <summary>
+        /// Calling from other scripts if you need to change screens programmatically
+        /// </summary>
+        /// <param name="pageNo"></param>
+        public void GoToScreen(int pageNo)
+        {
+            scrollSnap.GoToScreen(pageNo, true);
+        }
+
+
+        /// <summary>
+        /// Calls GoToScreen() based on the index of toggle that was pressed
+        /// </summary>
+        /// <param name="target"></param>
+        private void ToggleClick(Toggle target)
+        {
+            if (!target.isOn)
+            {
+                isAClick = true;
+                GoToScreen(m_PaginationChildren.IndexOf(target));
+            }
+
+        }
+
+        private void ToggleClick(bool toggle)
+        {
+            if (toggle)
+            {
+                for (int i = 0; i < m_PaginationChildren.Count; i++)
+                {
+                    if (m_PaginationChildren[i].isOn && !scrollSnap._suspendEvents)
+                    {
+                        GoToScreen(i);
+                        break;
+                    }
+                }
+            }
+        }
+
+        /// <summary>
+        /// Calls GoToScreen() based on the index of toggle that was pressed
+        /// </summary>
+        /// <param name="target"></param>
+        private void ToggleClick(int target)
+        {
+            isAClick = true;
+            GoToScreen(target);
+        }
+
+        private void SetToggleGraphics(int pageNo)
+        {
+            if (!isAClick)
+            {
+                m_PaginationChildren[pageNo].isOn = true;
+                //for (int i = 0; i < m_PaginationChildren.Count; i++)
+                //{
+                //    m_PaginationChildren[i].isOn = pageNo == i ? true : false;
+                //}
+            }
+        }
+
+        private void OnPageChangeEnd(int pageNo)
+        {
+            isAClick = false;
+        }
+    }
+}