Add handedness extension

Author: keveleigh

Assets/MixedRealityToolkit.Providers/WindowsMixedReality/Shared/Extensions.meta

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+#if (UNITY_WSA && DOTNETWINRT_PRESENT) || WINDOWS_UWP
+using Microsoft.MixedReality.Toolkit.Utilities;
+using Windows.UI.Input.Spatial;
+#endif // (UNITY_WSA && DOTNETWINRT_PRESENT) || WINDOWS_UWP
+
+namespace Microsoft.MixedReality.Toolkit.WindowsMixedReality
+{
+    /// <summary>
+    /// Provides useful extensions for Windows-defined types.
+    /// </summary>
+    public static class WindowsExtensions
+    {
+#if (UNITY_WSA && DOTNETWINRT_PRESENT) || WINDOWS_UWP
+        /// <summary>
+        /// Converts a platform <see cref="SpatialInteractionSourceHandedness"/> into
+        /// the equivalent value in MRTK's defined <see cref="Handedness"/>.
+        /// </summary>
+        /// <param name="handedness">The handedness value to convert.</param>
+        /// <returns>The converted value in the new type.</returns>
+        public static Handedness ToMRTKHandedness(this SpatialInteractionSourceHandedness handedness)
+        {
+            switch (handedness)
+            {
+                case SpatialInteractionSourceHandedness.Left:
+                    return Handedness.Left;
+                case SpatialInteractionSourceHandedness.Right:
+                    return Handedness.Right;
+                case SpatialInteractionSourceHandedness.Unspecified:
+                default:
+                    return Handedness.None;
+            }
+        }
+#endif // (UNITY_WSA && DOTNETWINRT_PRESENT) || WINDOWS_UWP
+    }
+}