1 files changed, 95 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/CollapsedLineSection.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/CollapsedLineSection.cs
new file mode 100644
index 000000000..bcbf55798
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Rendering/CollapsedLineSection.cs
@@ -0,0 +1,95 @@
+// 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.ComponentModel;
+using Tango.Scripting.Editors.Document;
+
+namespace Tango.Scripting.Editors.Rendering
+{
+	/// <summary>
+	/// Represents a collapsed line section.
+	/// Use the Uncollapse() method to uncollapse the section.
+	/// </summary>
+	public sealed class CollapsedLineSection
+	{
+		DocumentLine start, end;
+		HeightTree heightTree;
+		
+		#if DEBUG
+		internal string ID;
+		static int nextId;
+		#else
+		const string ID = "";
+		#endif
+		
+		internal CollapsedLineSection(HeightTree heightTree, DocumentLine start, DocumentLine end)
+		{
+			this.heightTree = heightTree;
+			this.start = start;
+			this.end = end;
+			#if DEBUG
+			unchecked {
+				this.ID = " #" + (nextId++);
+			}
+			#endif
+		}
+		
+		/// <summary>
+		/// Gets if the document line is collapsed.
+		/// This property initially is true and turns to false when uncollapsing the section.
+		/// </summary>
+		public bool IsCollapsed {
+			get { return start != null; }
+		}
+		
+		/// <summary>
+		/// Gets the start line of the section.
+		/// When the section is uncollapsed or the text containing it is deleted,
+		/// this property returns null.
+		/// </summary>
+		public DocumentLine Start {
+			get { return start; }
+			internal set { start = value; }
+		}
+		
+		/// <summary>
+		/// Gets the end line of the section.
+		/// When the section is uncollapsed or the text containing it is deleted,
+		/// this property returns null.
+		/// </summary>
+		public DocumentLine End {
+			get { return end; }
+			internal set { end = value; }
+		}
+		
+		/// <summary>
+		/// Uncollapses the section.
+		/// This causes the Start and End properties to be set to null!
+		/// Does nothing if the section is already uncollapsed.
+		/// </summary>
+		public void Uncollapse()
+		{
+			if (start == null)
+				return;
+			
+			heightTree.Uncollapse(this);
+			#if DEBUG
+			heightTree.CheckProperties();
+			#endif
+			
+			start = null;
+			end = null;
+		}
+		
+		/// <summary>
+		/// Gets a string representation of the collapsed section.
+		/// </summary>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Globalization", "CA1305:SpecifyIFormatProvider", MessageId = "System.Int32.ToString")]
+		public override string ToString()
+		{
+			return "[CollapsedSection" + ID + " Start=" + (start != null ? start.LineNumber.ToString() : "null")
+				+ " End=" + (end != null ? end.LineNumber.ToString() : "null") + "]";
+		}
+	}
+}