UndoableInsert.cs


1:	// UndoableInsert.cs
2:	// Copyright (c) 2000 Mike Krueger
3:	//
4:	// This program is free software; you can redistribute it and/or modify
5:	// it under the terms of the GNU General Public License as published by
6:	// the Free Software Foundation; either version 2 of the License, or
7:	// (at your option) any later version.
8:	//
9:	// This program is distributed in the hope that it will be useful,
10:	// but WITHOUT ANY WARRANTY; without even the implied warranty of
11:	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12:	// GNU General Public License for more details.
13:	//
14:	// You should have received a copy of the GNU General Public License
15:	// along with this program; if not, write to the Free Software
16:	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17:
18:	using System;
19:	using System.Diagnostics;
20:	using System.Drawing;
21:	using SharpDevelop.DefaultEditor.Text;
22:	using SharpDevelop.Internal.Undo;
23:
24:	namespace SharpDevelop.DefaultEditor.Undo {
25:
26:	/// <summary>
27:	/// This class is for the undo of Document insert operations
28:	/// </summary>
29:	public class UndoableInsert : IUndoableOperation
30:	{
31:	IDocument document;
32:	int oldCaretPos;
33:	int offset;
34:	string text;
35:
36:	public UndoableInsert(IDocument document, int offset, string text)
37:	{
38:	if (document == null) {
39:	throw new ArgumentNullException("document");
40:	}
41:	if (offset < 0 \|\| offset > document.TextLength) {
42:	throw new ArgumentOutOfRangeException("offset");
43:	}
44:
45:	Debug.Assert(text != null, "text can't be null");
46:	oldCaretPos = document.Caret.Offset;
47:	this.document = document;
48:	this.offset = offset;
49:	this.text = text;
50:	}
51:
52:	public void Undo()
53:	{
54:	document.UndoStack.AcceptChanges = false;
55:	document.Remove(offset, text.Length);
56:	document.Caret.Offset = oldCaretPos;
57:	document.UndoStack.AcceptChanges = true;
58:	}
59:
60:	public void Redo()
61:	{
62:	document.UndoStack.AcceptChanges = false;
63:	document.Insert(offset, text);
64:	document.UndoStack.AcceptChanges = true;
65:	}
66:	}
67:	}
68: