MERGE

1 files changed, 85 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/EmptySelection.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/EmptySelection.cs
new file mode 100644
index 000000000..6cca63ecb
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Editing/EmptySelection.cs
@@ -0,0 +1,85 @@
+// 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.Runtime.CompilerServices;
+using Tango.Scripting.Editors.Document;
+using Tango.Scripting.Editors.Utils;
+
+namespace Tango.Scripting.Editors.Editing
+{
+	sealed class EmptySelection : Selection
+	{
+		public EmptySelection(TextArea textArea) : base(textArea)
+		{
+		}
+		
+		public override Selection UpdateOnDocumentChange(DocumentChangeEventArgs e)
+		{
+			return this;
+		}
+		
+		public override TextViewPosition StartPosition {
+			get { return new TextViewPosition(TextLocation.Empty); }
+		}
+		
+		public override TextViewPosition EndPosition {
+			get { return new TextViewPosition(TextLocation.Empty); }
+		}
+		
+		public override ISegment SurroundingSegment {
+			get { return null; }
+		}
+		
+		public override Selection SetEndpoint(TextViewPosition endPosition)
+		{
+			throw new NotSupportedException();
+		}
+		
+		public override Selection StartSelectionOrSetEndpoint(TextViewPosition startPosition, TextViewPosition endPosition)
+		{
+			var document = textArea.Document;
+			if (document == null)
+				throw ThrowUtil.NoDocumentAssigned();
+			return Create(textArea, startPosition, endPosition);
+		}
+		
+		public override IEnumerable<SelectionSegment> Segments {
+			get { return Empty<SelectionSegment>.Array; }
+		}
+		
+		public override string GetText()
+		{
+			return string.Empty;
+		}
+		
+		public override void ReplaceSelectionWithText(string newText)
+		{
+			if (newText == null)
+				throw new ArgumentNullException("newText");
+			newText = AddSpacesIfRequired(newText, textArea.Caret.Position, textArea.Caret.Position);
+			if (newText.Length > 0) {
+				if (textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset)) {
+					textArea.Document.Insert(textArea.Caret.Offset, newText);
+				}
+			}
+			textArea.Caret.VisualColumn = -1;
+		}
+		
+		public override int Length {
+			get { return 0; }
+		}
+		
+		// Use reference equality because there's only one EmptySelection per text area.
+		public override int GetHashCode()
+		{
+			return RuntimeHelpers.GetHashCode(this);
+		}
+		
+		public override bool Equals(object obj)
+		{
+			return this == obj;
+		}
+	}
+}