Initial Commit

Descriptions/Description.cs

@@ -0,0 +1,86 @@
+using System;
+using System.Windows;
+
+namespace Microsoft.Research.DynamicDataDisplay
+{
+	public class ResolveLegendItemEventArgs : EventArgs
+	{
+		public ResolveLegendItemEventArgs(LegendItem legendItem)
+		{
+			LegendItem = legendItem;
+		}
+
+		public LegendItem LegendItem { get; set; }
+	}
+
+	public abstract class Description : FrameworkElement
+	{
+
+		private LegendItem legendItem;
+		public LegendItem LegendItem
+		{
+			get
+			{
+				if (legendItem == null)
+				{
+					legendItem = CreateLegendItem();
+				}
+				return legendItem;
+			}
+		}
+
+		private LegendItem CreateLegendItem()
+		{
+			LegendItem item = CreateLegendItemCore();
+			return RaiseResolveLegendItem(item);
+		}
+
+		protected virtual LegendItem CreateLegendItemCore()
+		{
+			return null;
+		}
+
+		public event EventHandler<ResolveLegendItemEventArgs> ResolveLegendItem;
+		private LegendItem RaiseResolveLegendItem(LegendItem uncustomizedLegendItem)
+		{
+			if (ResolveLegendItem != null)
+			{
+				ResolveLegendItemEventArgs e = new ResolveLegendItemEventArgs(uncustomizedLegendItem);
+				ResolveLegendItem(this, e);
+				return e.LegendItem;
+			}
+			else
+			{
+				return uncustomizedLegendItem;
+			}
+		}
+
+		private UIElement viewportElement;
+		public UIElement ViewportElement
+		{
+			get { return viewportElement; }
+		}
+
+		internal void Attach(UIElement element)
+		{
+			this.viewportElement = element;
+			AttachCore(element);
+		}
+
+		protected virtual void AttachCore(UIElement element) { }
+
+		internal void Detach()
+		{
+			viewportElement = null;
+		}
+
+		public abstract string Brief { get; }
+
+		public abstract string Full { get; }
+
+		public override string ToString()
+		{
+			return Brief;
+		}
+	}
+}