source: branches/2839_HiveProjectManagement/HeuristicLab.ExtLibs/HeuristicLab.AvalonEdit/5.0.1/AvalonEdit-5.0.1/Document/UndoOperationGroup.cs

// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
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// software and associated documentation files (the "Software"), to deal in the Software
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// 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
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using System;
using System.Diagnostics;
using ICSharpCode.AvalonEdit.Utils;

namespace ICSharpCode.AvalonEdit.Document
{
  /// <summary>
  /// This class stacks the last x operations from the undostack and makes
  /// one undo/redo operation from it.
  /// </summary>
  sealed class UndoOperationGroup : IUndoableOperationWithContext
  {
    IUndoableOperation[] undolist;
    
    public UndoOperationGroup(Deque<IUndoableOperation> stack, int numops)
    {
      if (stack == null)  {
        throw new ArgumentNullException("stack");
      }
      
      Debug.Assert(numops > 0 , "UndoOperationGroup : numops should be > 0");
      Debug.Assert(numops <= stack.Count);
      
      undolist = new IUndoableOperation[numops];
      for (int i = 0; i < numops; ++i) {
        undolist[i] = stack.PopBack();
      }
    }
    
    public void Undo()
    {
      for (int i = 0; i < undolist.Length; ++i) {
        undolist[i].Undo();
      }
    }
    
    public void Undo(UndoStack stack)
    {
      for (int i = 0; i < undolist.Length; ++i) {
        stack.RunUndo(undolist[i]);
      }
    }
    
    public void Redo()
    {
      for (int i = undolist.Length - 1; i >= 0; --i) {
        undolist[i].Redo();
      }
    }
    
    public void Redo(UndoStack stack)
    {
      for (int i = undolist.Length - 1; i >= 0; --i) {
        stack.RunRedo(undolist[i]);
      }
    }
  }
}