WPF specific file names

MapControl/WPF/DrawingTile.WPF.cs

@@ -0,0 +1,90 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media;
+using System.Windows.Media.Animation;
+using System.Windows.Media.Imaging;
+
+namespace MapControl
+{
+    public class DrawingTile : Tile
+    {
+        private readonly ImageDrawing imageDrawing = new ImageDrawing();
+
+        public DrawingTile(int zoomLevel, int x, int y, int columnCount)
+            : base(zoomLevel, x, y, columnCount)
+        {
+            Drawing.Children.Add(imageDrawing);
+        }
+
+        public DrawingGroup Drawing { get; } = new DrawingGroup();
+
+        public ImageSource ImageSource
+        {
+            get => imageDrawing.ImageSource;
+            set => imageDrawing.ImageSource = value;
+        }
+
+        public void SetRect(int xMin, int yMin, int tileWidth, int tileHeight)
+        {
+            imageDrawing.Rect = new Rect(tileWidth * (X - xMin), tileHeight * (Y - yMin), tileWidth, tileHeight);
+        }
+
+        public override async Task LoadImageAsync(Func<Task<ImageSource>> loadImageFunc)
+        {
+            var image = await loadImageFunc().ConfigureAwait(false);
+
+            void SetImageSource()
+            {
+                imageDrawing.ImageSource = image;
+
+                if (image != null && MapBase.ImageFadeDuration > TimeSpan.Zero)
+                {
+                    if (image is BitmapSource bitmap && !bitmap.IsFrozen && bitmap.IsDownloading)
+                    {
+                        bitmap.DownloadCompleted += BitmapDownloadCompleted;
+                        bitmap.DownloadFailed += BitmapDownloadFailed;
+                    }
+                    else
+                    {
+                        BeginFadeInAnimation();
+                    }
+                }
+            }
+
+            await Drawing.Dispatcher.InvokeAsync(SetImageSource);
+        }
+
+        private void BeginFadeInAnimation()
+        {
+            var fadeInAnimation = new DoubleAnimation
+            {
+                From = 0d,
+                Duration = MapBase.ImageFadeDuration,
+                FillBehavior = FillBehavior.Stop
+            };
+
+            Drawing.BeginAnimation(DrawingGroup.OpacityProperty, fadeInAnimation);
+        }
+
+        private void BitmapDownloadCompleted(object sender, EventArgs e)
+        {
+            var bitmap = (BitmapSource)sender;
+
+            bitmap.DownloadCompleted -= BitmapDownloadCompleted;
+            bitmap.DownloadFailed -= BitmapDownloadFailed;
+
+            BeginFadeInAnimation();
+        }
+
+        private void BitmapDownloadFailed(object sender, ExceptionEventArgs e)
+        {
+            var bitmap = (BitmapSource)sender;
+
+            bitmap.DownloadCompleted -= BitmapDownloadCompleted;
+            bitmap.DownloadFailed -= BitmapDownloadFailed;
+
+            imageDrawing.ImageSource = null;
+        }
+    }
+}