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ICSharpCode.TextEditor/Project/Src/Undo/UndoQueue.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.Collections.Generic;
+using System.Diagnostics;
+
+namespace ICSharpCode.TextEditor.Undo
+{
+	/// <summary>
+	/// This class stacks the last x operations from the undostack and makes
+	/// one undo/redo operation from it.
+	/// </summary>
+	internal sealed class UndoQueue : IUndoableOperation
+	{
+		List<IUndoableOperation> undolist = new List<IUndoableOperation>();
+		
+		/// <summary>
+		/// </summary>
+		public UndoQueue(Stack<IUndoableOperation> stack, int numops)
+		{
+			if (stack == null)  {
+				throw new ArgumentNullException("stack");
+			}
+			
+			Debug.Assert(numops > 0 , "ICSharpCode.TextEditor.Undo.UndoQueue : numops should be > 0");
+			if (numops > stack.Count) {
+				numops = stack.Count;
+			}
+			
+			for (int i = 0; i < numops; ++i) {
+				undolist.Add(stack.Pop());
+			}
+		}
+		public void Undo()
+		{
+			for (int i = 0; i < undolist.Count; ++i) {
+				undolist[i].Undo();
+			}
+		}
+		
+		public void Redo()
+		{
+			for (int i = undolist.Count - 1 ; i >= 0 ; --i) {
+				undolist[i].Redo();
+			}
+		}
+	}
+}