source: branches/HeuristicLab.Problems.GrammaticalOptimization/DynamicDataDisplay/Charts/Navigation/NavigationBase.cs @ 12503

using System.Windows;
using System.Windows.Media;

namespace Microsoft.Research.DynamicDataDisplay.Navigation
{
  /// <summary>Base class for all navigation providers</summary>
  public abstract class NavigationBase : ViewportElement2D
  {
    protected NavigationBase()
    {
      ManualTranslate = true;
      ManualClip = true;
      Loaded += NavigationBase_Loaded;
    }

    private void NavigationBase_Loaded(object sender, RoutedEventArgs e)
    {
      OnLoaded(e);
    }

    protected virtual void OnLoaded(RoutedEventArgs e)
    {
      // this call enables contextMenu to be shown after loading and
      // before any changes to Viewport - without this call 
      // context menu was not shown.
      InvalidateVisual();
    }

    protected override void OnRenderCore(DrawingContext dc, RenderState state)
    {
      dc.DrawRectangle(Brushes.Transparent, null, state.Output);
    }
  }
}