Version 4: Upgrade to VS 2017

MapControl/Shared/ViewportChangedEventArgs.cs

@@ -0,0 +1,29 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2017 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+
+namespace MapControl
+{
+    public class ViewportChangedEventArgs : EventArgs
+    {
+        public ViewportChangedEventArgs(bool projectionChanged = false, double longitudeOffset = 0d)
+        {
+            ProjectionChanged = projectionChanged;
+            LongitudeOffset = longitudeOffset;
+        }
+
+        /// <summary>
+        /// Indicates if the map projection has changed, i.e. if a MapTileLayer or MapImageLayer should be
+        /// immediately updated, or MapPath Data in cartesian map coordinates should be recalculated.
+        /// </summary>
+        public bool ProjectionChanged { get; }
+
+        /// <summary>
+        /// Offset of the map center longitude value from the previous viewport.
+        /// Used to detect if the map center has moved across 180° longitude.
+        /// </summary>
+        public double LongitudeOffset { get; }
+    }
+}