Initial Commit

Charts/Navigation/NavigationBase.cs

@@ -0,0 +1,34 @@
+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);
+		}
+	}
+}