source: branches/WebJobManager/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Snippets/Snippet.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using ICSharpCode.NRefactory.Editor;
using ICSharpCode.AvalonEdit.Document;
using ICSharpCode.AvalonEdit.Editing;

namespace ICSharpCode.AvalonEdit.Snippets
{
  /// <summary>
  /// A code snippet that can be inserted into the text editor.
  /// </summary>
  [Serializable]
  public class Snippet : SnippetContainerElement
  {
    /// <summary>
    /// Inserts the snippet into the text area.
    /// </summary>
    public void Insert(TextArea textArea)
    {
      if (textArea == null)
        throw new ArgumentNullException("textArea");
      
      ISegment selection = textArea.Selection.SurroundingSegment;
      int insertionPosition = textArea.Caret.Offset;
      
      if (selection != null) // if something is selected
        // use selection start instead of caret position,
        // because caret could be at end of selection or anywhere inside.
        // Removal of the selected text causes the caret position to be invalid.
        insertionPosition = selection.Offset + TextUtilities.GetWhitespaceAfter(textArea.Document, selection.Offset).Length;
      
      InsertionContext context = new InsertionContext(textArea, insertionPosition);
      
      using (context.Document.RunUpdate()) {
        if (selection != null)
          textArea.Document.Remove(insertionPosition, selection.EndOffset - insertionPosition);
        Insert(context);
        context.RaiseInsertionCompleted(EventArgs.Empty);
      }
    }
  }
}