https://github.com/AndreiMisiukevich/CardView/issues/59

PanCardView/CardsView.cs

@@ -135,6 +135,7 @@ public class CardsView : AbsoluteLayout
 		private readonly Dictionary<Guid, IEnumerable<View>> _viewsGestureCounter = new Dictionary<Guid, IEnumerable<View>>();
 		private readonly List<TimeDiffItem> _timeDiffItems = new List<TimeDiffItem>();
 		private readonly ViewsInUseSet _viewsInUse = new ViewsInUseSet();
+		private readonly InteractionQueue _interactions = new InteractionQueue();
 
 		private IEnumerable<View> _prevViews = Enumerable.Empty<View>();
 		private IEnumerable<View> _nextViews = Enumerable.Empty<View>();
@@ -152,7 +153,6 @@ public class CardsView : AbsoluteLayout
 		private bool _hasRenderer;
 		private bool? _isPortraitOrientation;
 		private bool? _shouldScrollParent;
-		private Guid _gestureId;
 		private DateTime _lastPanTime;
 		private CancellationTokenSource _slideshowTokenSource;
 
@@ -670,7 +670,7 @@ private void StartAutoNavigation(View view, Guid animationId, AnimationDirection
 		{
 			if (view != null)
 			{
-				_gestureId = animationId;
+				_interactions.Add(animationId, InteractionType.Animation);
 				IsAutoNavigating = true;
 				if (IsPanInCourse)
 				{
@@ -696,9 +696,10 @@ private void EndAutoNavigation(View view, Guid animationId, AnimationDirection a
 				}
 			}
 			IsAutoNavigating = false;
-			var isProcessingNow = _gestureId != animationId;
+			var isProcessingNow = !_interactions.CheckLastId(animationId);
 			RemoveRedundantChildren(isProcessingNow);
 			FireAutoNavigationEnded(animationDirection != AnimationDirection.Prev);
+			_interactions.Remove(animationId);
 		}
 
 		private AnimationDirection GetAutoNavigateAnimationDirection()
@@ -754,7 +755,9 @@ private void OnTouchStarted()
 				_inCoursePanDelay = int.MaxValue;
 			}
 
-			var gestureId = _gestureId = Guid.NewGuid();
+			var gestureId = Guid.NewGuid();
+			_interactions.Add(gestureId, InteractionType.Gesture);
+
 			FirePanStarted();
 			IsPanRunning = true;
 			_isPanEndRequested = false;
@@ -796,7 +799,7 @@ private async void OnTouchEnded(bool? isSwiped)
 			}
 
 			_lastPanTime = DateTime.Now;
-			var gestureId = _gestureId;
+			var gestureId = _interactions.GetFirstId(InteractionType.Gesture);
 
 			_isPanEndRequested = true;
 			var absDiff = Abs(CurrentDiff);
@@ -858,8 +861,9 @@ await Task.WhenAll(
 
 			FirePanEnded(isNextSelected, index, diff);
 
-			RemoveRangeViewsInUse(gestureId);
-			var isProcessingNow = gestureId != _gestureId;
+			var isProcessingNow = !_interactions.CheckLastId(gestureId);
+			RemoveRangeViewsInUse(gestureId, isProcessingNow);
+
 			if (!isProcessingNow)
 			{
 				IsPanRunning = false;
@@ -877,6 +881,8 @@ await Task.WhenAll(
 			RemoveRedundantChildren(isProcessingNow);
 
 			_inCoursePanDelay = 0;
+
+			_interactions.Remove(gestureId);
 		}
 
 		private bool? CheckSwipe()
@@ -1320,14 +1326,14 @@ private void AddRangeViewsInUse(Guid gestureId)
 			}
 		}
 
-		private void RemoveRangeViewsInUse(Guid gestureId)
+		private void RemoveRangeViewsInUse(Guid gestureId, bool isProcessingNow)
 		{
 			lock (_viewsInUseLocker)
 			{
 				foreach (var view in _viewsGestureCounter[gestureId])
 				{
 					_viewsInUse.Remove(view);
-					if (_gestureId != gestureId && !_viewsInUse.Contains(view))
+					if (isProcessingNow && !_viewsInUse.Contains(view))
 					{
 						CleanView(view);
 					}

PanCardView/Enums/InteractionType.cs

@@ -0,0 +1,14 @@
+using System;
+
+using Xamarin.Forms;
+
+namespace PanCardView.Enums
+{
+	[Flags]
+	public enum InteractionType
+	{
+		Gesture = -1,
+		Animation = 1
+	}
+}
+

PanCardView/PanCardView.csproj

@@ -50,6 +50,9 @@
     <Compile Include="SceneView.cs" />
     <Compile Include="Processors\BaseSceneBackProcessor.cs" />
     <Compile Include="Processors\BaseSceneFrontProcessor.cs" />
+    <Compile Include="Utility\InteractionQueue.cs" />
+    <Compile Include="Enums\InteractionType.cs" />
+    <Compile Include="Utility\InteractionItem.cs" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Processors\" />

PanCardView/Utility/InteractionItem.cs

@@ -0,0 +1,10 @@
+using System;
+using PanCardView.Enums;
+namespace PanCardView.Utility
+{
+	public struct InteractionItem
+	{
+		public Guid Id { get; set; }
+		public InteractionType Type { get; set; }
+	}
+}

PanCardView/Utility/InteractionQueue.cs

@@ -0,0 +1,51 @@
+using System;
+using PanCardView.Enums;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace PanCardView.Utility
+{
+	public sealed class InteractionQueue 
+	{
+		private readonly List<InteractionItem> _queue = new List<InteractionItem>();
+		private readonly object _queueLocker = new object();
+
+		public Guid GetFirstId(InteractionType type = InteractionType.Gesture | InteractionType.Animation)
+		{
+			lock(_queueLocker)
+			{
+				return _queue.FirstOrDefault(i => type.HasFlag(i.Type)).Id;
+			}
+		}
+
+		public void Add(Guid id, InteractionType type)
+		{
+			lock (_queueLocker)
+			{
+				_queue.Add(new InteractionItem
+				{
+					Id = id,
+					Type = type
+				});
+			}
+		}
+
+		public void Remove(Guid id)
+		{
+			lock (_queueLocker)
+			{
+				var item = _queue.FirstOrDefault(i => i.Id == id);
+				_queue.Remove(item);
+			}
+		}
+
+		public bool CheckLastId(Guid id, InteractionType type = InteractionType.Gesture | InteractionType.Animation)
+		{
+			lock(_queueLocker)
+			{
+				return _queue.LastOrDefault(i => type.HasFlag(i.Type)).Id == id;
+			}
+		}
+	}
+}
+