/Main/src/DynamicDataDisplay/Charts/Navigation/RectangleSelectionAdorner.cs

using System.Windows;

using System.Windows.Documents;

using System.Windows.Media;



namespace Microsoft.Research.DynamicDataDisplay.Navigation

{

    /// <summary>Helper class to draw semitransparent rectangle over the

    /// selection area</summary>

	public sealed class RectangleSelectionAdorner : Adorner {



		private Rect? border = null;

		public Rect? Border {

			get { return border; }

			set { border = value; }

		}



		public Brush Fill {

			get { return (Brush)GetValue(FillProperty); }

			set { SetValue(FillProperty, value); }

		}



		public static readonly DependencyProperty FillProperty =

			DependencyProperty.Register(

			  "Fill",

			  typeof(Brush),

			  typeof(RectangleSelectionAdorner),

			  new FrameworkPropertyMetadata(

				  new SolidColorBrush(Color.FromArgb(60, 100, 100, 100)),

				  FrameworkPropertyMetadataOptions.AffectsRender));



		private Pen pen;

		public Pen Pen {

			get { return pen; }

			set { pen = value; }

		}



		public RectangleSelectionAdorner(UIElement element)

			: base(element) {

			pen = new Pen(Brushes.Black, 1.0);

		}



		protected override void OnRender(DrawingContext dc) {

			if (border.HasValue) {

				dc.DrawRectangle(Fill, pen, border.Value);

			}

		}

	}

}