Initial Commit

DataSources/OneDimensional/EmptyDataSource.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.Diagnostics.CodeAnalysis;
+
+namespace Microsoft.Research.DynamicDataDisplay.DataSources
+{
+	/// <summary>
+	/// Empty data source - for testing purposes, represents data source with 0 points inside.
+	/// </summary>
+	public class EmptyDataSource : IPointDataSource
+	{
+		#region IPointDataSource Members
+
+		public IPointEnumerator GetEnumerator(DependencyObject context)
+		{
+			return new EmptyPointEnumerator();
+		}
+
+		[SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+		private void RaiseDataChanged()
+		{
+			if (DataChanged != null)
+			{
+				DataChanged(this, EventArgs.Empty);
+			}
+		}
+
+		public event EventHandler DataChanged;
+
+		#endregion
+
+		private sealed class EmptyPointEnumerator : IPointEnumerator
+		{
+			public bool MoveNext()
+			{
+				return false;
+			}
+
+			public void GetCurrent(ref Point p)
+			{
+				// nothing to do
+			}
+
+			public void ApplyMappings(DependencyObject target)
+			{
+				// nothing to do
+			}
+
+			public void Dispose() { }
+		}
+	}
+}