Gyazoライクな画面範囲選択をC#とReactive Extensions (Rx)で書いた - Qiitapublic static Task<Rect> SelectScreenPositionAsync() { var shapeRect = new Rectangle() { Fill = new SolidColorBrush(Color.FromArgb(0x44, 0x99, 0, 0)), Stroke = Brushes.Red }; var canvas = new Canvas(); canvas.Children.Add(shapeRect); var window = new Window() { Title = "Select Screen Position", Top = 0, Left = 0, Width = SystemParameters.VirtualScreenWidth, Height = SystemParameters.VirtualScreenH
