Fixed panning for UWP/WinUI

MapControl/Shared/MapImageLayer.cs

@@ -73,16 +73,13 @@ namespace MapControl
 #if WINUI
         private readonly DispatcherQueueTimer updateTimer;
 #else
-        private readonly DispatcherTimer updateTimer = new DispatcherTimer();
+        private readonly DispatcherTimer updateTimer;
 #endif
         private bool updateInProgress;
 
         public MapImageLayer()
         {
-#if WINUI
-            updateTimer = DispatcherQueue.CreateTimer();
-#endif
-            updateTimer.Interval = UpdateInterval;
+            updateTimer = this.CreateTimer(UpdateInterval);
             updateTimer.Tick += async (s, e) => await UpdateImageAsync();
         }
 
@@ -227,12 +224,7 @@ namespace MapControl
 
                 base.OnViewportChanged(e);
 
-                if (!UpdateWhileViewportChanging)
-                {
-                    updateTimer.Stop(); // restart
-                }
-
-                updateTimer.Start();
+                updateTimer.Run(!UpdateWhileViewportChanging);
             }
         }
 
@@ -242,7 +234,7 @@ namespace MapControl
 
             if (updateInProgress)
             {
-                updateTimer.Start(); // update image on next timer tick
+                updateTimer.Run(); // update image on next timer tick
             }
             else if (ParentMap != null && ParentMap.RenderSize.Width > 0 && ParentMap.RenderSize.Height > 0)
             {

MapControl/Shared/MapTileLayerBase.cs

@@ -61,7 +61,7 @@ namespace MapControl
 #if WINUI
         private readonly DispatcherQueueTimer updateTimer;
 #else
-        private readonly DispatcherTimer updateTimer = new DispatcherTimer();
+        private readonly DispatcherTimer updateTimer;
 #endif
         private MapBase parentMap;
 
@@ -69,10 +69,8 @@ namespace MapControl
         {
             RenderTransform = new MatrixTransform();
             TileImageLoader = tileImageLoader;
-#if WINUI
-            updateTimer = DispatcherQueue.CreateTimer();
-#endif
-            updateTimer.Interval = UpdateInterval;
+
+            updateTimer = this.CreateTimer(UpdateInterval);
             updateTimer.Tick += async (s, e) => await Update();
 
 #if WINUI || UWP
@@ -172,7 +170,7 @@ namespace MapControl
                     parentMap.ViewportChanged += OnViewportChanged;
                 }
 
-                updateTimer.Start();
+                updateTimer.Run();
             }
         }
 
@@ -207,12 +205,7 @@ namespace MapControl
             {
                 SetRenderTransform();
 
-                if (!UpdateWhileViewportChanging)
-                {
-                    updateTimer.Stop(); // restart
-                }
-
-                updateTimer.Start();
+                updateTimer.Run(!UpdateWhileViewportChanging);
             }
         }
     }

MapControl/UWP/MapControl.UWP.csproj

@@ -227,6 +227,9 @@
     <Compile Include="..\WinUI\Vector.WinUI.cs">
       <Link>Vector.WinUI.cs</Link>
     </Compile>
+    <Compile Include="..\WPF\Timer.WPF.cs">
+      <Link>Timer.WPF.cs</Link>
+    </Compile>
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="TileImageLoader.UWP.cs" />
     <EmbeddedResource Include="Properties\MapControl.UWP.rd.xml" />

MapControl/WPF/Timer.WPF.cs

@@ -0,0 +1,40 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2021 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+#if UWP
+using Windows.UI.Xaml;
+#else
+using System.Windows;
+using System.Windows.Threading;
+#endif
+
+namespace MapControl
+{
+    internal static class Timer
+    {
+        public static DispatcherTimer CreateTimer(this DependencyObject obj, TimeSpan interval)
+        {
+            var timer = new DispatcherTimer
+            {
+                Interval = interval
+            };
+
+            return timer;
+        }
+
+        public static void Run(this DispatcherTimer timer, bool restart = false)
+        {
+            if (restart)
+            {
+                timer.Stop();
+            }
+
+            if (!timer.IsEnabled)
+            {
+                timer.Start();
+            }
+        }
+    }
+}

MapControl/WinUI/Map.WinUI.cs

@@ -21,6 +21,8 @@ namespace MapControl
         public static readonly DependencyProperty MouseWheelZoomDeltaProperty = DependencyProperty.Register(
             nameof(MouseWheelZoomDelta), typeof(double), typeof(Map), new PropertyMetadata(1d));
 
+        private Point? mousePosition;
+
         public Map()
         {
             ManipulationMode = ManipulationModes.Scale
@@ -28,8 +30,11 @@ namespace MapControl
                 | ManipulationModes.TranslateY
                 | ManipulationModes.TranslateInertia;
 
-            ManipulationDelta += OnManipulationDelta;
             PointerWheelChanged += OnPointerWheelChanged;
+            PointerPressed += OnPointerPressed;
+            PointerReleased += OnPointerReleased;
+            PointerMoved += OnPointerMoved;
+            ManipulationDelta += OnManipulationDelta;
         }
 
         /// <summary>
@@ -42,11 +47,6 @@ namespace MapControl
             set { SetValue(MouseWheelZoomDeltaProperty, value); }
         }
 
-        private void OnManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
-        {
-            TransformMap(e.Position, e.Delta.Translation, e.Delta.Rotation, e.Delta.Scale);
-        }
-
         private void OnPointerWheelChanged(object sender, PointerRoutedEventArgs e)
         {
             var point = e.GetCurrentPoint(this);
@@ -54,5 +54,42 @@ namespace MapControl
 
             ZoomMap(point.Position, MouseWheelZoomDelta * Math.Round(zoomLevel / MouseWheelZoomDelta));
         }
+
+        private void OnPointerPressed(object sender, PointerRoutedEventArgs e)
+        {
+            if (CapturePointer(e.Pointer))
+            {
+                mousePosition = e.GetCurrentPoint(this).Position;
+            }
+        }
+
+        private void OnPointerReleased(object sender, PointerRoutedEventArgs e)
+        {
+            if (mousePosition.HasValue)
+            {
+                mousePosition = null;
+                ReleasePointerCaptures();
+            }
+        }
+
+        private void OnPointerMoved(object sender, PointerRoutedEventArgs e)
+        {
+            if (mousePosition.HasValue)
+            {
+                Point position = e.GetCurrentPoint(this).Position;
+                var translation = position - mousePosition.Value;
+                mousePosition = position;
+
+                TranslateMap(translation);
+            }
+        }
+
+        private void OnManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
+        {
+            if (!mousePosition.HasValue)
+            {
+                TransformMap(e.Position, e.Delta.Translation, e.Delta.Rotation, e.Delta.Scale);
+            }
+        }
     }
 }

MapControl/WinUI/Timer.WinUI.cs

@@ -0,0 +1,33 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2021 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using Microsoft.UI.Dispatching;
+using Microsoft.UI.Xaml;
+using System;
+
+namespace MapControl
+{
+    internal static class Timer
+    {
+        public static DispatcherQueueTimer CreateTimer(this DependencyObject obj, TimeSpan interval)
+        {
+            var timer = obj.DispatcherQueue.CreateTimer();
+            timer.Interval = interval;
+            return timer;
+        }
+
+        public static void Run(this DispatcherQueueTimer timer, bool restart = false)
+        {
+            if (restart)
+            {
+                timer.Stop();
+            }
+
+            if (!timer.IsRunning)
+            {
+                timer.Start();
+            }
+        }
+    }
+}