Added optional event delta to OnEndDrag - to allow bail out of swipe action if swipe motion is actually negligible at end of drag

Scripts/Layout/HorizontalScrollSnap.cs

@@ -2,6 +2,7 @@
 /// Sourced from - http://forum.unity3d.com/threads/scripts-useful-4-6-scripts-collection.264161/page-2#post-1945602
 /// Updated by ddreaper - removed dependency on a custom ScrollRect script. Now implements drag interfaces and standard Scroll Rect.
 
+using System;
 using UnityEngine.EventSystems;
 
 namespace UnityEngine.UI.Extensions
@@ -245,6 +246,12 @@ namespace UnityEngine.UI.Extensions
             _pointerDown = false;
 
             if (_scroll_rect.horizontal)
+            {
+                if (UseSwipeDeltaThreshold && Math.Abs(eventData.delta.x) < SwipeDeltaThreshold)
+                {
+                    ScrollToClosestElement();
+                }
+                else
                 {
                     var distance = Vector3.Distance(_startPosition, _screensContainer.localPosition);
 
@@ -299,6 +306,7 @@ namespace UnityEngine.UI.Extensions
                     }
                 }
             }
+        }
 
         #endregion
     }

Scripts/Layout/ScrollSnapBase.cs

@@ -70,12 +70,18 @@ namespace UnityEngine.UI.Extensions
         [Tooltip("Fast Swipe makes swiping page next / previous (optional)")]
         public Boolean UseFastSwipe = false;
         
+        [Tooltip("Swipe Delta Threshold looks at the speed of input to decide if a swipe will be initiated (optional)")]
+        public Boolean UseSwipeDeltaThreshold = false;
+
         [Tooltip("Offset for how far a 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 = 100;
         
+        [Tooltip("Threshold for swipe speed to initiate a swipe, below threshold will return to closest page (optional)")]
+        public float SwipeDeltaThreshold = 5.0f;
+
 	[Tooltip("Use time scale instead of unscaled time (optional)")]
 	public Boolean UseTimeScale = true;
 

Scripts/Layout/VerticalScrollSnap.cs

@@ -3,6 +3,7 @@
 /// Updated by SimonDarksideJ - removed dependency on a custom ScrollRect script. Now implements drag interfaces and standard Scroll Rect.
 /// Updated by SimonDarksideJ - major refactoring on updating current position and scroll management
 
+using System;
 using UnityEngine.EventSystems;
 
 namespace UnityEngine.UI.Extensions
@@ -237,9 +238,16 @@ namespace UnityEngine.UI.Extensions
             _pointerDown = false;
 
             if (_scroll_rect.vertical)
+            {
+                if (UseSwipeDeltaThreshold && Math.Abs(eventData.delta.y) < SwipeDeltaThreshold)
+                {
+                    ScrollToClosestElement();
+                }
+                else
                 {
                     var distance = Vector3.Distance(_startPosition, _screensContainer.localPosition);
-                if(UseHardSwipe){
+                    if (UseHardSwipe)
+                    {
                         _scroll_rect.velocity = Vector3.zero;
 
                         if (distance > FastSwipeThreshold)
@@ -289,6 +297,7 @@ namespace UnityEngine.UI.Extensions
                     }
                 }
             }
+        }
         #endregion
     }
 }