Initial Commit

ViewportRestrictions/FollowWidthRestriction.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows;
+using System.ComponentModel;
+
+namespace Microsoft.Research.DynamicDataDisplay.ViewportRestrictions
+{
+	/// <summary>
+	/// Represents a viewport restriction which modifies x coordinates of result visible rect to be adjacent to the right border of initial rect and have a fixed given width.
+	/// Probably is better to add to FitToViewRestrictions collection of <see cref="Viewport"/>.
+	/// </summary>
+	public class FollowWidthRestriction : ViewportRestriction
+	{
+		/// <summary>
+		/// Initializes a new instance of the <see cref="FollowWidthRestriction"/> class.
+		/// </summary>
+		public FollowWidthRestriction() { }
+
+		/// <summary>
+		/// Initializes a new instance of the <see cref="FollowWidthRestriction"/> class with the given width.
+		/// </summary>
+		/// <param name="width">The width.</param>
+		public FollowWidthRestriction(double width)
+		{
+			Width = width;
+		}
+
+		private double width = 1;
+		/// <summary>
+		/// Gets or sets the width of result visible rectangle.
+		/// Default value is 1.0.
+		/// </summary>
+		/// <value>The width.</value>
+		[DefaultValue(1.0)]
+		public double Width
+		{
+			get { return width; }
+			set
+			{
+				if (width != value)
+				{
+					width = value;
+					RaiseChanged();
+				}
+			}
+		}
+
+		/// <summary>
+		/// Applies the restriction.
+		/// </summary>
+		/// <param name="previousDataRect">Previous data rectangle.</param>
+		/// <param name="proposedDataRect">Proposed data rectangle.</param>
+		/// <param name="viewport">The viewport, to which current restriction is being applied.</param>
+		/// <returns>New changed visible rectangle.</returns>
+		public override DataRect Apply(DataRect previousDataRect, DataRect proposedDataRect, Viewport2D viewport)
+		{
+			if (proposedDataRect.IsEmpty)
+				return proposedDataRect;
+
+			double followWidth = proposedDataRect.Width;
+			if (!viewport.UnitedContentBounds.IsEmpty)
+			{
+				followWidth = Math.Min(width, viewport.UnitedContentBounds.Width);
+			}
+			if (followWidth.IsInfinite())
+				followWidth = width;
+
+			Rect visible = new Rect(proposedDataRect.XMin + proposedDataRect.Width - followWidth, proposedDataRect.YMin, followWidth, proposedDataRect.Height);
+
+			return visible;
+		}
+	}
+}