From cc7c66f9f590ede02cc780bf71566db1a5d02e9d Mon Sep 17 00:00:00 2001
From: Simon Jackson <darkside@zenithmoon.com>
Date: Thu, 23 Feb 2017 15:18:16 +0000
Subject: [PATCH] Updated Scroll Snap Base to resolve #119

---
 Scripts/Layout/ScrollSnapBase.cs | 740 ++++++++++++++++---------------
 1 file changed, 374 insertions(+), 366 deletions(-)

diff --git a/Scripts/Layout/ScrollSnapBase.cs b/Scripts/Layout/ScrollSnapBase.cs
index 295c1e5..110b49c 100644
--- a/Scripts/Layout/ScrollSnapBase.cs
+++ b/Scripts/Layout/ScrollSnapBase.cs
@@ -4,444 +4,452 @@ using UnityEngine.EventSystems;
 
 namespace UnityEngine.UI.Extensions
 {
-    public class ScrollSnapBase : MonoBehaviour, IBeginDragHandler, IDragHandler
-    {
-        internal RectTransform _screensContainer;
-        internal bool _isVertical;
+	public class ScrollSnapBase : MonoBehaviour, IBeginDragHandler, IDragHandler
+	{
+		internal RectTransform _screensContainer;
+		internal bool _isVertical;
 
-        internal int _screens = 1;
+		internal int _screens = 1;
 
-        internal float _scrollStartPosition;
-        internal float _childSize;
-        private float _childPos, _maskSize;
-        internal Vector2 _childAnchorPoint;
-        internal ScrollRect _scroll_rect;
-        internal Vector3 _lerp_target;
-        internal bool _lerp;
-        internal bool _pointerDown = false;
-        internal bool _settled = true;
-        internal Vector3 _startPosition = new Vector3();
-        [Tooltip("The currently active page")]
-        internal int _currentPage;
-        internal int _previousPage;
-        internal int _halfNoVisibleItems;
-        private int _bottomItem, _topItem;
+		internal float _scrollStartPosition;
+		internal float _childSize;
+		private float _childPos, _maskSize;
+		internal Vector2 _childAnchorPoint;
+		internal ScrollRect _scroll_rect;
+		internal Vector3 _lerp_target;
+		internal bool _lerp;
+		internal bool _pointerDown = false;
+		internal bool _settled = true;
+		internal Vector3 _startPosition = new Vector3();
+		[Tooltip("The currently active page")]
+		internal int _currentPage;
+		internal int _previousPage;
+		internal int _halfNoVisibleItems;
+		private int _bottomItem, _topItem;
 
-        [Serializable]
-        public class SelectionChangeStartEvent : UnityEvent { }
-        [Serializable]
-        public class SelectionPageChangedEvent : UnityEvent<int> { }
-        [Serializable]
-        public class SelectionChangeEndEvent : UnityEvent<int> { }
+		[Serializable]
+		public class SelectionChangeStartEvent : UnityEvent { }
+		[Serializable]
+		public class SelectionPageChangedEvent : UnityEvent<int> { }
+		[Serializable]
+		public class SelectionChangeEndEvent : UnityEvent<int> { }
 
-        [Tooltip("The screen / page to start the control on\n*Note, this is a 0 indexed array")]
-        [SerializeField]
-        public int StartingScreen = 0;
+		[Tooltip("The screen / page to start the control on\n*Note, this is a 0 indexed array")]
+		[SerializeField]
+		public int StartingScreen = 0;
 
-        [Tooltip("The distance between two pages based on page height, by default pages are next to each other")]
-        [SerializeField]
-        [Range(1, 8)]
-        public float PageStep = 1;
+		[Tooltip("The distance between two pages based on page height, by default pages are next to each other")]
+		[SerializeField]
+		[Range(0, 8)]
+		public float PageStep = 1;
 
-        [Tooltip("The gameobject that contains toggles which suggest pagination. (optional)")]
-        public GameObject Pagination;
+		[Tooltip("The gameobject that contains toggles which suggest pagination. (optional)")]
+		public GameObject Pagination;
 
-        [Tooltip("Button to go to the previous page. (optional)")]
-        public GameObject PrevButton;
+		[Tooltip("Button to go to the previous page. (optional)")]
+		public GameObject PrevButton;
 
-        [Tooltip("Button to go to the next page. (optional)")]
-        public GameObject NextButton;
+		[Tooltip("Button to go to the next page. (optional)")]
+		public GameObject NextButton;
 
-        [Tooltip("Transition speed between pages. (optional)")]
-        public float transitionSpeed = 7.5f;
+		[Tooltip("Transition speed between pages. (optional)")]
+		public float transitionSpeed = 7.5f;
 
-        [Tooltip("Fast Swipe makes swiping page next / previous (optional)")]
-        public Boolean UseFastSwipe = false;
+		[Tooltip("Fast Swipe makes swiping page next / previous (optional)")]
+		public Boolean UseFastSwipe = false;
 
-        [Tooltip("How far swipe has to travel to initiate a page change (optional)")]
-        public int FastSwipeThreshold = 100;
+		[Tooltip("How far swipe has to travel to initiate a page change (optional)")]
+		public int FastSwipeThreshold = 100;
 
-        [Tooltip("Speed at which the ScrollRect will keep scrolling before slowing down and stopping (optional)")]
-        public int SwipeVelocityThreshold = 200;
+		[Tooltip("Speed at which the ScrollRect will keep scrolling before slowing down and stopping (optional)")]
+		public int SwipeVelocityThreshold = 200;
 
-        [Tooltip("The visible bounds area, controls which items are visible/enabled. *Note Should use a RectMask. (optional)")]
-        public RectTransform MaskArea;
+		[Tooltip("The visible bounds area, controls which items are visible/enabled. *Note Should use a RectMask. (optional)")]
+		public RectTransform MaskArea;
 
-        [Tooltip("Pixel size to buffer arround Mask Area. (optional)")]
-        public float MaskBuffer = 1;
-        
-        public int CurrentPage
-        {
-            get
-            {
-                return _currentPage;
-            }
-            internal set
-            {
-                if ((value != _currentPage && value >= 0 && value < _screensContainer.childCount) || (value == 0 && _screensContainer.childCount == 0))
-                {
-                    _previousPage = _currentPage;
-                    _currentPage = value;
-                    if(MaskArea) UpdateVisible();
-                    if(!_lerp) ScreenChange();
-                    OnCurrentScreenChange(_currentPage);
-                }
-            }
-        }
+		[Tooltip("Pixel size to buffer arround Mask Area. (optional)")]
+		public float MaskBuffer = 1;
 
-        [Tooltip("(Experimental)\nBy default, child array objects will use the parent transform\nHowever you can disable this for some interesting effects")]
-        public bool UseParentTransform = true;
+		public int CurrentPage
+		{
+			get
+			{
+				return _currentPage;
+			}
 
-        [Tooltip("Scroll Snap children. (optional)\nEither place objects in the scene as children OR\nPrefabs in this array, NOT BOTH")]
-        public GameObject[] ChildObjects;
-        
-        [SerializeField]
-        [Tooltip("Event fires when a user starts to change the selection")]
-        private SelectionChangeStartEvent m_OnSelectionChangeStartEvent = new SelectionChangeStartEvent();
-        public SelectionChangeStartEvent OnSelectionChangeStartEvent { get { return m_OnSelectionChangeStartEvent; } set { m_OnSelectionChangeStartEvent = value; } }
+			internal set
+			{
+				if ((value != _currentPage && value >= 0 && value < _screensContainer.childCount) || (value == 0 && _screensContainer.childCount == 0))
+				{
+					_previousPage = _currentPage;
+					_currentPage = value;
+					if(MaskArea) UpdateVisible();
+					if(!_lerp) ScreenChange();
+					OnCurrentScreenChange(_currentPage);
+				}
+			}
+		}
 
-        [SerializeField]
-        [Tooltip("Event fires as the page changes, while dragging or jumping")]
-        private SelectionPageChangedEvent m_OnSelectionPageChangedEvent = new SelectionPageChangedEvent();
-        public SelectionPageChangedEvent OnSelectionPageChangedEvent { get { return m_OnSelectionPageChangedEvent; } set { m_OnSelectionPageChangedEvent = value; } }
+		[Tooltip("(Experimental)\nBy default, child array objects will use the parent transform\nHowever you can disable this for some interesting effects")]
+		public bool UseParentTransform = true;
 
-        [SerializeField]
-        [Tooltip("Event fires when the page settles after a user has dragged")]
-        private SelectionChangeEndEvent m_OnSelectionChangeEndEvent = new SelectionChangeEndEvent();
-        public SelectionChangeEndEvent OnSelectionChangeEndEvent { get { return m_OnSelectionChangeEndEvent; } set { m_OnSelectionChangeEndEvent = value; } }
+		[Tooltip("Scroll Snap children. (optional)\nEither place objects in the scene as children OR\nPrefabs in this array, NOT BOTH")]
+		public GameObject[] ChildObjects;
 
+		[SerializeField]
+		[Tooltip("Event fires when a user starts to change the selection")]
+		private SelectionChangeStartEvent m_OnSelectionChangeStartEvent = new SelectionChangeStartEvent();
+		public SelectionChangeStartEvent OnSelectionChangeStartEvent { get { return m_OnSelectionChangeStartEvent; } set { m_OnSelectionChangeStartEvent = value; } }
 
-        // Use this for initialization
+		[SerializeField]
+		[Tooltip("Event fires as the page changes, while dragging or jumping")]
+		private SelectionPageChangedEvent m_OnSelectionPageChangedEvent = new SelectionPageChangedEvent();
+		public SelectionPageChangedEvent OnSelectionPageChangedEvent { get { return m_OnSelectionPageChangedEvent; } set { m_OnSelectionPageChangedEvent = value; } }
+
+		[SerializeField]
+		[Tooltip("Event fires when the page settles after a user has dragged")]
+		private SelectionChangeEndEvent m_OnSelectionChangeEndEvent = new SelectionChangeEndEvent();
+		public SelectionChangeEndEvent OnSelectionChangeEndEvent { get { return m_OnSelectionChangeEndEvent; } set { m_OnSelectionChangeEndEvent = value; } }
+
+		// Use this for initialization
         void Awake()
-        {
-            _scroll_rect = gameObject.GetComponent<ScrollRect>();
+		{
+			_scroll_rect = gameObject.GetComponent<ScrollRect>();
 
-            if (_scroll_rect.horizontalScrollbar || _scroll_rect.verticalScrollbar)
-            {
-                Debug.LogWarning("Warning, using scrollbars with the Scroll Snap controls is not advised as it causes unpredictable results");
-            }
+			if (_scroll_rect.horizontalScrollbar || _scroll_rect.verticalScrollbar)
+			{
+				Debug.LogWarning("Warning, using scrollbars with the Scroll Snap controls is not advised as it causes unpredictable results");
+			}
 
-            if (StartingScreen < 0)
-            {
-                StartingScreen = 0;
-            }
+			if (StartingScreen < 0)
+			{
+				StartingScreen = 0;
+			}
 
-            _screensContainer = _scroll_rect.content;
-            if (ChildObjects != null && ChildObjects.Length > 0)
-            {
-                if (_screensContainer.transform.childCount > 0)
-                {
-                    Debug.LogError("ScrollRect Content has children, this is not supported when using managed Child Objects\n Either remove the ScrollRect Content children or clear the ChildObjects array");
-                    return;
-                }
-                InitialiseChildObjectsFromArray();
-            }
-            else
-            {
-                InitialiseChildObjectsFromScene();
-            }
+			_screensContainer = _scroll_rect.content;
+			if (ChildObjects != null && ChildObjects.Length > 0)
+			{
+				if (_screensContainer.transform.childCount > 0)
+				{
+					Debug.LogError("ScrollRect Content has children, this is not supported when using managed Child Objects\n Either remove the ScrollRect Content children or clear the ChildObjects array");
+					return;
+				}
 
-            if (NextButton)
-                NextButton.GetComponent<Button>().onClick.AddListener(() => { NextScreen(); });
+				InitialiseChildObjectsFromArray();
+			}
+			else
+			{
+				InitialiseChildObjectsFromScene();
+			}
 
-            if (PrevButton)
-                PrevButton.GetComponent<Button>().onClick.AddListener(() => { PreviousScreen(); });
-        }
+			if (NextButton)
+				NextButton.GetComponent<Button>().onClick.AddListener(() => { NextScreen(); });
 
-        internal void InitialiseChildObjectsFromScene()
-        {
-            int childCount = _screensContainer.childCount;
-            ChildObjects = new GameObject[childCount];
-            for (int i = 0; i < childCount; i++)
-            {
-                ChildObjects[i] = _screensContainer.transform.GetChild(i).gameObject;
-                if (MaskArea && ChildObjects[i].activeSelf)
-                {
-                    ChildObjects[i].SetActive(false);
-                }
-            }
-        }
+			if (PrevButton)
+				PrevButton.GetComponent<Button>().onClick.AddListener(() => { PreviousScreen(); });
+			}
 
-        internal void InitialiseChildObjectsFromArray()
-        {
-            int childCount = ChildObjects.Length;
-            RectTransform childRect;
-            GameObject child;
-            for (int i = 0; i < childCount; i++)
-            {
-                child = GameObject.Instantiate(ChildObjects[i]);
-                //Optionally, use original GO transform when initialising, by default will use parent RectTransform position/rotation
+		internal void InitialiseChildObjectsFromScene()
+		{
+			int childCount = _screensContainer.childCount;
+			ChildObjects = new GameObject[childCount];
+			for (int i = 0; i < childCount; i++)
+			{
+				ChildObjects[i] = _screensContainer.transform.GetChild(i).gameObject;
+				if (MaskArea && ChildObjects[i].activeSelf)
+				{
+					ChildObjects[i].SetActive(false);
+				}
+			}
+		}
+
+		internal void InitialiseChildObjectsFromArray()
+		{
+			int childCount = ChildObjects.Length;
+			RectTransform childRect;
+			GameObject child;
+			for (int i = 0; i < childCount; i++)
+			{
+				child = GameObject.Instantiate(ChildObjects[i]);
+				//Optionally, use original GO transform when initialising, by default will use parent RectTransform position/rotation
                 if (UseParentTransform)
-                {
-                    childRect = child.GetComponent<RectTransform>();
-                    childRect.rotation = _screensContainer.rotation;
-                    childRect.localScale = _screensContainer.localScale;
-                    childRect.position = _screensContainer.position;
-                }
-                child.transform.SetParent(_screensContainer.transform);
-                ChildObjects[i] = child;
-                if (MaskArea && ChildObjects[i].activeSelf)
-                {
-                    ChildObjects[i].SetActive(false);
-                }
-            }
-        }
+				{
+					childRect = child.GetComponent<RectTransform>();
+					childRect.rotation = _screensContainer.rotation;
+					childRect.localScale = _screensContainer.localScale;
+					childRect.position = _screensContainer.position;
+				}
 
-        internal void UpdateVisible()
-        {
-            //If there are no objects in the scene or a mask, exit
+				child.transform.SetParent(_screensContainer.transform);
+				ChildObjects[i] = child;
+				if (MaskArea && ChildObjects[i].activeSelf)
+				{
+					ChildObjects[i].SetActive(false);
+				}
+			}
+		}
+
+		internal void UpdateVisible()
+		{
+			//If there are no objects in the scene or a mask, exit
             if (!MaskArea || ChildObjects == null || ChildObjects.Length < 1 || _screensContainer.childCount < 1)
-            {
-                return;
-            }
+			{
+				return;
+			}
 
-            _maskSize = _isVertical ? MaskArea.rect.height : MaskArea.rect.width;
-            _halfNoVisibleItems = (int)Math.Round(_maskSize / (_childSize * MaskBuffer), MidpointRounding.AwayFromZero) / 2;
-            _bottomItem = _topItem = 0;
-            //work out how many items below the current page can be visible
-            for (int i = _halfNoVisibleItems + 1; i > 0 ; i--)
-            {
-                _bottomItem = _currentPage - i < 0 ? 0 : i;
-                if (_bottomItem > 0) break;
-            }
-            //work out how many items above the current page can be visible
+			_maskSize = _isVertical ? MaskArea.rect.height : MaskArea.rect.width;
+			_halfNoVisibleItems = (int)Math.Round(_maskSize / (_childSize * MaskBuffer), MidpointRounding.AwayFromZero) / 2;
+			_bottomItem = _topItem = 0;
+			//work out how many items below the current page can be visible
             for (int i = _halfNoVisibleItems + 1; i > 0; i--)
-            {
-                _topItem = _screensContainer.childCount - _currentPage - i < 0 ? 0 : i;
-                if (_topItem > 0) break;
-            }
-            //Set the active items active
+			{
+				_bottomItem = _currentPage - i < 0 ? 0 : i;
+				if (_bottomItem > 0) break;
+			}
+
+			//work out how many items above the current page can be visible
+            for (int i = _halfNoVisibleItems + 1; i > 0; i--)
+			{
+				_topItem = _screensContainer.childCount - _currentPage - i < 0 ? 0 : i;
+				if (_topItem > 0) break;
+			}
+
+			//Set the active items active
             for (int i = CurrentPage - _bottomItem; i < CurrentPage + _topItem; i++)
-            {
-                try
-                {
-                    ChildObjects[i].SetActive(true);
-                }
-                catch
-                {
-                    Debug.Log("Failed to setactive child [" + i + "]");
-                }
-            }
+			{
+				try
+				{
+					ChildObjects[i].SetActive(true);
+				}
+				catch
+				{
+					Debug.Log("Failed to setactive child [" + i + "]");
+				}
+			}
 
-            //Deactivate items out of visibility at the bottom of the ScrollRect Mask (only on scroll)
-            if (_currentPage > _halfNoVisibleItems) ChildObjects[CurrentPage - _bottomItem].SetActive(false);
-            //Deactivate items out of visibility at the top of the ScrollRect Mask (only on scroll)
-            if (_screensContainer.childCount - _currentPage > _topItem) ChildObjects[CurrentPage + _topItem].SetActive(false);
-        }
+			//Deactivate items out of visibility at the bottom of the ScrollRect Mask (only on scroll)
+			if (_currentPage > _halfNoVisibleItems) ChildObjects[CurrentPage - _bottomItem].SetActive(false);
+			//Deactivate items out of visibility at the top of the ScrollRect Mask (only on scroll)
+			if (_screensContainer.childCount - _currentPage > _topItem) ChildObjects[CurrentPage + _topItem].SetActive(false);
+		}
 
-
-        //Function for switching screens with buttons
+		//Function for switching screens with buttons
         public void NextScreen()
-        {
-            if (_currentPage < _screens - 1)
-            {
-                if (!_lerp) StartScreenChange();
+		{
+			if (_currentPage < _screens - 1)
+			{
+				if (!_lerp) StartScreenChange();
 
-                _lerp = true;
-                CurrentPage = _currentPage + 1;
-                GetPositionforPage(_currentPage, ref _lerp_target);
-                ScreenChange();
-            }
-        }
+				_lerp = true;
+				CurrentPage = _currentPage + 1;
+				GetPositionforPage(_currentPage, ref _lerp_target);
+				ScreenChange();
+			}
+		}
 
-        //Function for switching screens with buttons
+		//Function for switching screens with buttons
         public void PreviousScreen()
-        {
-            if (_currentPage > 0)
-            {
-                if (!_lerp) StartScreenChange();
+		{
+			if (_currentPage > 0)
+			{
+				if (!_lerp) StartScreenChange();
 
-                _lerp = true;
-                CurrentPage = _currentPage - 1;
-                GetPositionforPage(_currentPage, ref _lerp_target);
-                ScreenChange();
-            }
-        }
+				_lerp = true;
+				CurrentPage = _currentPage - 1;
+				GetPositionforPage(_currentPage, ref _lerp_target);
+				ScreenChange();
+			}
+		}
 
-        /// <summary>
-        /// Function for switching to a specific screen
-        /// *Note, this is based on a 0 starting index - 0 to x
-        /// </summary>
-        /// <param name="screenIndex">0 starting index of page to jump to</param>
+		/// <summary>
+		/// Function for switching to a specific screen
+		/// *Note, this is based on a 0 starting index - 0 to x
+		/// </summary>
+		/// <param name="screenIndex">0 starting index of page to jump to</param>
         public void GoToScreen(int screenIndex)
-        {
-            if (screenIndex <= _screens - 1 && screenIndex >= 0)
-            {
-                if (!_lerp) StartScreenChange();
+		{
+			if (screenIndex <= _screens - 1 && screenIndex >= 0)
+			{
+				if (!_lerp) StartScreenChange();
 
-                _lerp = true;
-                CurrentPage = screenIndex;
-                GetPositionforPage(_currentPage, ref _lerp_target);
-                ScreenChange();
-            }
-        }
+				_lerp = true;
+				CurrentPage = screenIndex;
+				GetPositionforPage(_currentPage, ref _lerp_target);
+				ScreenChange();
+			}
+		}
 
-        /// <summary>
-        /// Gets the closest page for the current Scroll Rect container position
-        /// </summary>
-        /// <param name="pos">Position to test, normally the Scroll Rect container Local position</param>
-        /// <returns>Closest Page number (zero indexed array value)</returns>
+		/// <summary>
+		/// Gets the closest page for the current Scroll Rect container position
+		/// </summary>
+		/// <param name="pos">Position to test, normally the Scroll Rect container Local position</param>
+		/// <returns>Closest Page number (zero indexed array value)</returns>
         internal int GetPageforPosition(Vector3 pos)
-        {
-            return _isVertical ? 
+		{
+			return _isVertical ?
                 -(int)Math.Round((pos.y - _scrollStartPosition) / _childSize) :
                 -(int)Math.Round((pos.x - _scrollStartPosition) / _childSize);
-        }
+		}
 
-        /// <summary>
-        /// Validates if the current Scroll Rect container position is within the bounds for a page
-        /// </summary>
-        /// <param name="pos">Position to test, normally the Scroll Rect container Local position</param>
-        /// <returns>True / False, is the position in the bounds of a page</returns>
+		/// <summary>
+		/// Validates if the current Scroll Rect container position is within the bounds for a page
+		/// </summary>
+		/// <param name="pos">Position to test, normally the Scroll Rect container Local position</param>
+		/// <returns>True / False, is the position in the bounds of a page</returns>
         internal bool IsRectSettledOnaPage(Vector3 pos)
-        {
-            return _isVertical ?
+		{
+			return _isVertical ?
                 -((pos.y - _scrollStartPosition) / _childSize) == -(int)Math.Round((pos.y - _scrollStartPosition) / _childSize) :
-                -((pos.x - _scrollStartPosition) / _childSize)  == -(int)Math.Round((pos.x - _scrollStartPosition) / _childSize);
-        }
+                -((pos.x - _scrollStartPosition) / _childSize) == -(int)Math.Round((pos.x - _scrollStartPosition) / _childSize);
+		}
 
-        /// <summary>
-        /// Returns the local position for a child page based on the required page number
-        /// </summary>
-        /// <param name="page">Page that the position is required for (Zero indexed array value)</param>
-        /// <param name="target">Outputs the local position for the selected page</param>
+		/// <summary>
+		/// Returns the local position for a child page based on the required page number
+		/// </summary>
+		/// <param name="page">Page that the position is required for (Zero indexed array value)</param>
+		/// <param name="target">Outputs the local position for the selected page</param>
         internal void GetPositionforPage(int page, ref Vector3 target)
-        {
-            _childPos = -_childSize * page;
-            if (_isVertical)
-            {
-                target.y = _childPos + _scrollStartPosition;
-            }
-            else
-            {
-                target.x = _childPos + _scrollStartPosition;
-            }
-        }
+		{
+			_childPos = -_childSize * page;
+			if (_isVertical)
+			{
+				target.y = _childPos + _scrollStartPosition;
+			}
+			else
+			{
+				target.x = _childPos + _scrollStartPosition;
+			}
+		}
 
-        /// <summary>
-        /// Updates the _Lerp target to the closest page and updates the pagination bullets.  Each control's update loop will then handle the move.
-        /// </summary>
+		/// <summary>
+		/// Updates the _Lerp target to the closest page and updates the pagination bullets.  Each control's update loop will then handle the move.
+		/// </summary>
         internal void ScrollToClosestElement()
-        {
-            _lerp = true;
-            CurrentPage = GetPageforPosition(_screensContainer.localPosition);
-            GetPositionforPage(_currentPage, ref _lerp_target);
-            OnCurrentScreenChange(_currentPage);
-        }
+		{
+			_lerp = true;
+			CurrentPage = GetPageforPosition(_screensContainer.localPosition);
+			GetPositionforPage(_currentPage, ref _lerp_target);
+			OnCurrentScreenChange(_currentPage);
+		}
 
-        /// <summary>
-        /// notifies pagination indicator and navigation buttons of a screen change
-        /// </summary>
+		/// <summary>
+		/// notifies pagination indicator and navigation buttons of a screen change
+		/// </summary>
         internal void OnCurrentScreenChange(int currentScreen)
-        {
-            ChangeBulletsInfo(currentScreen);
-            ToggleNavigationButtons(currentScreen);
-        }
+		{
+			ChangeBulletsInfo(currentScreen);
+			ToggleNavigationButtons(currentScreen);
+		}
 
-        /// <summary>
-        /// changes the bullets on the bottom of the page - pagination
-        /// </summary>
-        /// <param name="targetScreen"></param>
+		/// <summary>
+		/// changes the bullets on the bottom of the page - pagination
+		/// </summary>
+		/// <param name="targetScreen"></param>
         private void ChangeBulletsInfo(int targetScreen)
-        {
-            if (Pagination)
-                for (int i = 0; i < Pagination.transform.childCount; i++)
-                {
-                    Pagination.transform.GetChild(i).GetComponent<Toggle>().isOn = (targetScreen == i)
-                        ? true
+		{
+			if (Pagination)
+				for (int i = 0; i < Pagination.transform.childCount; i++)
+				{
+					Pagination.transform.GetChild(i).GetComponent<Toggle>().isOn = (targetScreen == i)
+			? true
                         : false;
-                }
-        }
+		}
+	}
 
-        /// <summary>
-        /// disables the page navigation buttons when at the first or last screen
-        /// </summary>
-        /// <param name="targetScreen"></param>
+	/// <summary>
+	/// disables the page navigation buttons when at the first or last screen
+	/// </summary>
+	/// <param name="targetScreen"></param>
         private void ToggleNavigationButtons(int targetScreen) {
-            if (PrevButton) {
-                PrevButton.GetComponent<Button>().interactable = targetScreen > 0;
-            }
-            if (NextButton) {
-                NextButton.GetComponent<Button>().interactable = targetScreen < _screensContainer.transform.childCount - 1;
-            }
-        }
+		if (PrevButton) {
+			PrevButton.GetComponent<Button>().interactable = targetScreen > 0;
+		}
 
-        private void OnValidate()
-        {
-            var children  = gameObject.GetComponent<ScrollRect>().content.childCount;
-            if (children != 0 || ChildObjects != null)
-            {
-                var childCount = ChildObjects == null || ChildObjects.Length == 0 ? children : ChildObjects.Length;
-                if (StartingScreen > childCount - 1)
-                {
-                    StartingScreen = childCount - 1;
-                }
-                if (StartingScreen < 0)
-                {
-                    StartingScreen = 0;
-                }
-            }
-            if (MaskBuffer <= 0)
-            {
-                MaskBuffer = 1;
-            }
-            if (PageStep < 0)
-            {
-                PageStep = 0;
-            }
-            if (PageStep > 8)
-            {
-                PageStep = 9;
-            }
-        }
+		if (NextButton) {
+			NextButton.GetComponent<Button>().interactable = targetScreen < _screensContainer.transform.childCount - 1;
+		}
+	}
 
-        /// <summary>
-        /// Event fires when the user starts to change the page, either via swipe or button.
-        /// </summary>
+	private void OnValidate()
+	{
+		var children = gameObject.GetComponent<ScrollRect>().content.childCount;
+		if (children != 0 || ChildObjects != null)
+		{
+			var childCount = ChildObjects == null || ChildObjects.Length == 0 ? children : ChildObjects.Length;
+			if (StartingScreen > childCount - 1)
+			{
+				StartingScreen = childCount - 1;
+			}
+
+			if (StartingScreen < 0)
+			{
+				StartingScreen = 0;
+			}
+		}
+
+		if (MaskBuffer <= 0)
+		{
+			MaskBuffer = 1;
+		}
+
+		if (PageStep < 0)
+		{
+			PageStep = 0;
+		}
+
+		if (PageStep > 8)
+		{
+			PageStep = 9;
+		}
+	}
+
+	/// <summary>
+	/// Event fires when the user starts to change the page, either via swipe or button.
+	/// </summary>
         internal void StartScreenChange()
-        {
-            OnSelectionChangeStartEvent.Invoke();
-        }
+	{
+		OnSelectionChangeStartEvent.Invoke();
+	}
 
-        /// <summary>
-        /// Event fires when the currently viewed page changes, also updates while the scroll is moving
-        /// </summary>
+	/// <summary>
+	/// Event fires when the currently viewed page changes, also updates while the scroll is moving
+	/// </summary>
         internal void ScreenChange()
-        {
-            OnSelectionPageChangedEvent.Invoke(_currentPage);
-        }
+	{
+		OnSelectionPageChangedEvent.Invoke(_currentPage);
+	}
 
-        /// <summary>
-        /// Event fires when control settles on a page, outputs the new page number
-        /// </summary>
+	/// <summary>
+	/// Event fires when control settles on a page, outputs the new page number
+	/// </summary>
         internal void EndScreenChange()
-        {
-            OnSelectionChangeEndEvent.Invoke(_currentPage);
-            _settled = true;
-        }
+	{
+		OnSelectionChangeEndEvent.Invoke(_currentPage);
+		_settled = true;
+	}
 
-        #region Interfaces
-        /// <summary>
-        /// Touch screen to start swiping
-        /// </summary>
-        /// <param name="eventData"></param>
+	#region Interfaces
+	/// <summary>
+	/// Touch screen to start swiping
+	/// </summary>
+	/// <param name="eventData"></param>
         public void OnBeginDrag(PointerEventData eventData)
-        {
-            _pointerDown = true;
-            _settled = false;
-            StartScreenChange();
-            _startPosition = _screensContainer.localPosition;
-        }
+	{
+		_pointerDown = true;
+		_settled = false;
+		StartScreenChange();
+		_startPosition = _screensContainer.localPosition;
+	}
 
-        /// <summary>
-        /// While dragging do
-        /// </summary>
-        /// <param name="eventData"></param>
+	/// <summary>
+	/// While dragging do
+	/// </summary>
+	/// <param name="eventData"></param>
         public void OnDrag(PointerEventData eventData)
-        {
-            _lerp = false;
-        }
+	{
+		_lerp = false;
+	}
 
-        #endregion
-    }
+	#endregion
+}
 }
\ No newline at end of file