Initial Commit

Common/PlotterEventHelper.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+
+namespace Microsoft.Research.DynamicDataDisplay.Common
+{
+	public sealed class PlotterEventHelper
+	{
+		private RoutedEvent @event;
+		internal PlotterEventHelper(RoutedEvent @event)
+		{
+			this.@event = @event;
+		}
+
+		// todo use a weakReference here
+		private readonly Dictionary<DependencyObject, EventHandler<PlotterChangedEventArgs>> handlers = new Dictionary<DependencyObject, EventHandler<PlotterChangedEventArgs>>();
+
+		public void Subscribe(DependencyObject target, EventHandler<PlotterChangedEventArgs> handler)
+		{
+			if (target == null)
+				throw new ArgumentNullException("target");
+			if (handler == null)
+				throw new ArgumentNullException("handler");
+
+			handlers.Add(target, handler);
+		}
+
+		internal void Notify(FrameworkElement target, PlotterChangedEventArgs args)
+		{
+			if (args.RoutedEvent == @event && handlers.ContainsKey(target))
+			{
+				var handler = handlers[target];
+				handler(target, args);
+			}
+		}
+	}
+}