source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Navigation/RectangleSelectionAdorner.cs @ 13398

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);
      }
    }
  }
}