Merge branch 'master' of https://twinetfs.visualstudio.com/_git/Tango

1 files changed, 53 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SelectionLayer.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SelectionLayer.cs
new file mode 100644
index 000000000..28631affe
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/SelectionLayer.cs
@@ -0,0 +1,53 @@
+// 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;
+
+namespace Tango.Scripting.Editors.Editing
+{
+	sealed class SelectionLayer : Layer, IWeakEventListener
+	{
+		readonly TextArea textArea;
+		
+		public SelectionLayer(TextArea textArea) : base(textArea.TextView, KnownLayer.Selection)
+		{
+			this.IsHitTestVisible = false;
+			
+			this.textArea = textArea;
+			TextViewWeakEventManager.VisualLinesChanged.AddListener(textView, this);
+			TextViewWeakEventManager.ScrollOffsetChanged.AddListener(textView, this);
+		}
+		
+		bool IWeakEventListener.ReceiveWeakEvent(Type managerType, object sender, EventArgs e)
+		{
+			if (managerType == typeof(TextViewWeakEventManager.VisualLinesChanged)
+			    || managerType == typeof(TextViewWeakEventManager.ScrollOffsetChanged))
+			{
+				InvalidateVisual();
+				return true;
+			}
+			return false;
+		}
+		
+		protected override void OnRender(DrawingContext drawingContext)
+		{
+			base.OnRender(drawingContext);
+			
+			BackgroundGeometryBuilder geoBuilder = new BackgroundGeometryBuilder();
+			geoBuilder.AlignToMiddleOfPixels = true;
+			geoBuilder.ExtendToFullWidthAtLineEnd = textArea.Selection.EnableVirtualSpace;
+			geoBuilder.CornerRadius = textArea.SelectionCornerRadius;
+			foreach (var segment in textArea.Selection.Segments) {
+				geoBuilder.AddSegment(textView, segment);
+			}
+			Geometry geometry = geoBuilder.CreateGeometry();
+			if (geometry != null) {
+				drawingContext.DrawGeometry(textArea.SelectionBrush, textArea.SelectionBorder, geometry);
+			}
+		}
+	}
+}