Initial Commit

ViewportRestrictions/RestrictionCollection.cs

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+using System.Linq;
+using System.Windows;
+using Microsoft.Research.DynamicDataDisplay;
+using Microsoft.Research.DynamicDataDisplay.Common;
+using Microsoft.Research.DynamicDataDisplay.Common.Auxiliary;
+using System;
+using System.Collections.Specialized;
+
+namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
+{
+	/// <summary>
+	/// Represents a collection of <see cref="ViewportRestriction"/>s.
+	/// <remarks>
+	/// ViewportRestriction that is being added should not be null.
+	/// </remarks>
+	/// </summary>
+	public sealed class RestrictionCollection : D3Collection<ViewportRestriction>
+	{
+		private readonly Viewport2D viewport;
+		internal RestrictionCollection(Viewport2D viewport)
+		{
+			if (viewport == null)
+				throw new ArgumentNullException("viewport");
+
+			this.viewport = viewport;
+		}
+
+		protected override void OnItemAdding(ViewportRestriction item)
+		{
+			if (item == null)
+				throw new ArgumentNullException("item");
+		}
+
+		protected override void OnItemAdded(ViewportRestriction item)
+		{
+			item.Changed += OnItemChanged;
+			ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
+			if (attachable != null)
+			{
+				attachable.Attach(viewport);
+			}
+		}
+
+		private void OnItemChanged(object sender, EventArgs e)
+		{
+			OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+		}
+
+		protected override void OnItemRemoving(ViewportRestriction item)
+		{
+			ISupportAttachToViewport attachable = item as ISupportAttachToViewport;
+			if (attachable != null)
+			{
+				attachable.Detach(viewport);
+			}
+			item.Changed -= OnItemChanged;
+		}
+
+		internal DataRect Apply(DataRect oldVisible, DataRect newVisible, Viewport2D viewport)
+		{
+			DataRect res = newVisible;
+			foreach (var restriction in this)
+			{
+				res = restriction.Apply(oldVisible, res, viewport);
+			}
+			return res;
+		}
+	}
+}