1 files changed, 64 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/ColumnRulerRenderer.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/ColumnRulerRenderer.cs
new file mode 100644
index 000000000..62a29dcb1
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/ColumnRulerRenderer.cs
@@ -0,0 +1,64 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows;
+using System.Windows.Media;
+
+using Tango.Scripting.Editors.Rendering;
+using Tango.Scripting.Editors.Utils;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// Renders a ruler at a certain column.
+	/// </summary>
+	sealed class ColumnRulerRenderer : IBackgroundRenderer
+	{
+		Pen pen;
+		int column;
+		TextView textView;
+		
+		public static readonly Color DefaultForeground = Colors.LightGray;
+		
+		public ColumnRulerRenderer(TextView textView)
+		{
+			if (textView == null)
+				throw new ArgumentNullException("textView");
+			
+			this.pen = new Pen(new SolidColorBrush(DefaultForeground), 1);
+			this.pen.Freeze();
+			this.textView = textView;
+			this.textView.BackgroundRenderers.Add(this);
+		}
+		
+		public KnownLayer Layer {
+			get { return KnownLayer.Background; }
+		}
+		
+		public void SetRuler(int column, Pen pen)
+		{
+			if (this.column != column) {
+				this.column = column;
+				textView.InvalidateLayer(this.Layer);
+			}
+			if (this.pen != pen) {
+				this.pen = pen;
+				textView.InvalidateLayer(this.Layer);
+			}
+		}
+		
+		public void Draw(TextView textView, System.Windows.Media.DrawingContext drawingContext)
+		{
+			if (column < 1) return;
+			double offset = textView.WideSpaceWidth * column;
+			Size pixelSize = PixelSnapHelpers.GetPixelSize(textView);
+			double markerXPos = PixelSnapHelpers.PixelAlign(offset, pixelSize.Width);
+			markerXPos -= textView.ScrollOffset.X;
+			Point start = new Point(markerXPos, 0);
+			Point end = new Point(markerXPos, Math.Max(textView.DocumentHeight, textView.ActualHeight));
+			
+			drawingContext.DrawLine(pen, start, end);
+		}
+	}
+}