1 files changed, 70 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/TextLayer.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/TextLayer.cs
new file mode 100644
index 000000000..3f4b8299b
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/TextLayer.cs
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+// 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.Collections.Generic;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// The control that contains the text.
+	/// 
+	/// This control is used to allow other UIElements to be placed inside the TextView but
+	/// behind the text.
+	/// The text rendering process (VisualLine creation) is controlled by the TextView, this
+	/// class simply displays the created Visual Lines.
+	/// </summary>
+	/// <remarks>
+	/// This class does not contain any input handling and is invisible to hit testing. Input
+	/// is handled by the TextView.
+	/// This allows UIElements that are displayed behind the text, but still can react to mouse input.
+	/// </remarks>
+	sealed class TextLayer : Layer
+	{
+		/// <summary>
+		/// the index of the text layer in the layers collection
+		/// </summary>
+		internal int index;
+		
+		public TextLayer(TextView textView) : base(textView, KnownLayer.Text)
+		{
+		}
+		
+		List<VisualLineDrawingVisual> visuals = new List<VisualLineDrawingVisual>();
+		
+		internal void SetVisualLines(ICollection<VisualLine> visualLines)
+		{
+			foreach (VisualLineDrawingVisual v in visuals) {
+				if (v.VisualLine.IsDisposed)
+					RemoveVisualChild(v);
+			}
+			visuals.Clear();
+			foreach (VisualLine newLine in visualLines) {
+				VisualLineDrawingVisual v = newLine.Render();
+				if (!v.IsAdded) {
+					AddVisualChild(v);
+					v.IsAdded = true;
+				}
+				visuals.Add(v);
+			}
+			InvalidateArrange();
+		}
+		
+		protected override int VisualChildrenCount {
+			get { return visuals.Count; }
+		}
+		
+		protected override Visual GetVisualChild(int index)
+		{
+			return visuals[index];
+		}
+		
+		protected override void ArrangeCore(Rect finalRect)
+		{
+			textView.ArrangeTextLayer(visuals);
+		}
+	}
+}