Mono.TextEditor.TextViewMargin.OpenCodeSegmentEditor C# (CSharp) Method

		internal void OpenCodeSegmentEditor ()
		{
			if (!IsCodeSegmentPreviewWindowShown)
				throw new InvalidOperationException ("CodeSegment preview window isn't shown.");
			var previewSegment = previewWindow.Segment;

			int x = 0, y = 0;
			this.previewWindow.GdkWindow.GetOrigin (out x, out y);
			int w = previewWindow.Allocation.Width;
			int h = previewWindow.Allocation.Height;
			if (!previewWindow.HideCodeSegmentPreviewInformString)
				h -= previewWindow.PreviewInformStringHeight;
			CodeSegmentEditorWindow codeSegmentEditorWindow = new CodeSegmentEditorWindow (textEditor);
			codeSegmentEditorWindow.Move (x, y);
			codeSegmentEditorWindow.Resize (w, h);
			int indentLength = SyntaxMode.GetIndentLength (Document, previewSegment.Offset, previewSegment.Length, false);

			StringBuilder textBuilder = new StringBuilder ();
			int curOffset = previewSegment.Offset;
			while (curOffset >= 0 && curOffset < previewSegment.EndOffset && curOffset < Document.TextLength) {
				DocumentLine line = Document.GetLineByOffset (curOffset);
				string lineText = Document.GetTextAt (curOffset, line.Offset + line.Length - curOffset);
				textBuilder.Append (lineText);
				textBuilder.AppendLine ();
				curOffset = line.EndOffsetIncludingDelimiter + indentLength;
			}

			codeSegmentEditorWindow.Text = textBuilder.ToString ();

			HideCodeSegmentPreviewWindow ();
			codeSegmentEditorWindow.ShowAll ();

			codeSegmentEditorWindow.GrabFocus ();

		}