Removed obsolete platform detection code in ControlCatalog.

Fixes #659.

samples/ControlCatalog.Desktop/Program.cs

@@ -39,96 +39,4 @@ namespace ControlCatalog
                 .SetDefaultAssembly(typeof(App).Assembly);
         }
     }
-
-    /////////////////////////////////////////////////////////////////////////////////////////////////////////////
-    // Experimental: Would like to move this into a shared location once I figure out the best place for it 
-    // considering all common libraries are PCL and do not have access to Environment.OSVersion.Platform
-    // nor do they have access to the platform specific render/subsystem extensions.
-    // 
-    // Perhaps via DI we register each system with a priority/rank
-    //
-    public static class RenderSystemExtensions
-    {
-        [Flags]
-        enum RenderSystem
-        {
-            None = 0,
-            GTK = 1,
-            Skia = 2,
-            Direct2D = 4
-        };
-
-        /// <summary>
-        /// Default (Optimal) render system for a particular platform
-        /// </summary>
-        /// <returns></returns>
-        private static RenderSystem DefaultRenderSystem()
-        {
-            switch (Environment.OSVersion.Platform)
-            {
-                case PlatformID.MacOSX:
-                    return RenderSystem.GTK;
-
-                case PlatformID.Unix:
-                    return RenderSystem.GTK;
-
-                case PlatformID.Win32Windows:
-                    return RenderSystem.Direct2D;
-            }
-
-            return RenderSystem.None;
-        }
-
-        /// <summary>
-        /// Returns an array of avalidable rendering systems in priority order
-        /// </summary>
-        /// <returns></returns>
-        private static RenderSystem[] AvailableRenderSystems()
-        {
-            switch (Environment.OSVersion.Platform)
-            {
-                case PlatformID.MacOSX:
-                    return new RenderSystem[] { RenderSystem.GTK, RenderSystem.Skia };
-
-                case PlatformID.Unix:
-                    return new RenderSystem[] { RenderSystem.GTK, RenderSystem.Skia };
-
-                case PlatformID.Win32Windows:
-                    return new RenderSystem[] { RenderSystem.Direct2D, RenderSystem.Skia, RenderSystem.GTK };
-            }
-
-            return new RenderSystem[0];
-        }
-
-        /// <summary>
-        /// Selects the optimal render system for desktop platforms. Supports cmd line overrides
-        /// </summary>
-        /// <param name="builder"></param>
-        /// <param name="args"></param>
-        public static AppBuilder ConfigureRenderSystem(this AppBuilder builder, string[] args)
-        {
-            // So this all works great under Windows where it can support
-            // ALL configurations. But on OSX/Unix we cannot use Direct2D
-            if (args.Contains("--gtk") || DefaultRenderSystem() == RenderSystem.GTK)
-            {
-                builder.UseGtk();
-                builder.UseCairo();
-            }
-            else
-            {
-                builder.UseWin32();
-
-                if (args.Contains("--skia") || DefaultRenderSystem() == RenderSystem.Skia)
-                {
-                    builder.UseSkia();
-                }
-                else
-                {
-                    builder.UseDirect2D1();
-                }
-            }
-
-            return builder;
-        }
-    }
 }