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source: trunk/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Document/DocumentChangeOperation.cs @ 18242

Last change on this file since 18242 was 11700, checked in by jkarder, 10 years ago

#2077: created branch and added first version

File size: 2.4 KB
Line 
1// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
2//
3// Permission is hereby granted, free of charge, to any person obtaining a copy of this
4// software and associated documentation files (the "Software"), to deal in the Software
5// without restriction, including without limitation the rights to use, copy, modify, merge,
6// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
7// to whom the Software is furnished to do so, subject to the following conditions:
8//
9// The above copyright notice and this permission notice shall be included in all copies or
10// substantial portions of the Software.
11//
12// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
13// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
14// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
15// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
16// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
17// DEALINGS IN THE SOFTWARE.
18
19using System;
20using System.Diagnostics;
21
22namespace ICSharpCode.AvalonEdit.Document
23{
24  /// <summary>
25  /// Describes a change to a TextDocument.
26  /// </summary>
27  sealed class DocumentChangeOperation : IUndoableOperationWithContext
28  {
29    TextDocument document;
30    DocumentChangeEventArgs change;
31   
32    public DocumentChangeOperation(TextDocument document, DocumentChangeEventArgs change)
33    {
34      this.document = document;
35      this.change = change;
36    }
37   
38    public void Undo(UndoStack stack)
39    {
40      Debug.Assert(stack.state == UndoStack.StatePlayback);
41      stack.RegisterAffectedDocument(document);
42      stack.state = UndoStack.StatePlaybackModifyDocument;
43      this.Undo();
44      stack.state = UndoStack.StatePlayback;
45    }
46   
47    public void Redo(UndoStack stack)
48    {
49      Debug.Assert(stack.state == UndoStack.StatePlayback);
50      stack.RegisterAffectedDocument(document);
51      stack.state = UndoStack.StatePlaybackModifyDocument;
52      this.Redo();
53      stack.state = UndoStack.StatePlayback;
54    }
55   
56    public void Undo()
57    {
58      OffsetChangeMap map = change.OffsetChangeMapOrNull;
59      document.Replace(change.Offset, change.InsertionLength, change.RemovedText, map != null ? map.Invert() : null);
60    }
61   
62    public void Redo()
63    {
64      document.Replace(change.Offset, change.RemovalLength, change.InsertedText, change.OffsetChangeMapOrNull);
65    }
66  }
67}
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