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ICSharpCode.TextEditor/Project/Src/Undo/UndoableReplace.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
+//     <version>$Revision$</version>
+// </file>
+
+using System;
+using System.Diagnostics;
+using ICSharpCode.TextEditor.Document;
+
+namespace ICSharpCode.TextEditor.Undo
+{
+	/// <summary>
+	/// This class is for the undo of Document insert operations
+	/// </summary>
+	public class UndoableReplace : IUndoableOperation
+	{
+		IDocument document;
+//		int       oldCaretPos;
+		int       offset;
+		string    text;
+		string    origText;
+		
+		/// <summary>
+		/// Creates a new instance of <see cref="UndoableReplace"/>
+		/// </summary>	
+		public UndoableReplace(IDocument document, int offset, string origText, string text)
+		{
+			if (document == null) {
+				throw new ArgumentNullException("document");
+			}
+			if (offset < 0 || offset > document.TextLength) {
+				throw new ArgumentOutOfRangeException("offset");
+			}
+			
+			Debug.Assert(text != null, "text can't be null");
+//			oldCaretPos   = document.Caret.Offset;
+			this.document = document;
+			this.offset   = offset;
+			this.text     = text;
+			this.origText = origText;
+		}
+		
+		/// <remarks>
+		/// Undo last operation
+		/// </remarks>
+		public void Undo()
+		{
+			// we clear all selection direct, because the redraw
+			// is done per refresh at the end of the action
+//			document.SelectionCollection.Clear();
+
+			document.UndoStack.AcceptChanges = false;
+			document.Replace(offset, text.Length, origText);
+//			document.Caret.Offset = Math.Min(document.TextLength, Math.Max(0, oldCaretPos));
+			document.UndoStack.AcceptChanges = true;
+		}
+		
+		/// <remarks>
+		/// Redo last undone operation
+		/// </remarks>
+		public void Redo()
+		{
+			// we clear all selection direct, because the redraw
+			// is done per refresh at the end of the action
+//			document.SelectionCollection.Clear();
+
+			document.UndoStack.AcceptChanges = false;
+			document.Replace(offset, origText.Length, text);
+//			document.Caret.Offset = Math.Min(document.TextLength, Math.Max(0, document.Caret.Offset));
+			document.UndoStack.AcceptChanges = true;
+		}
+	}
+}