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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Diagnostics;
using Tango.Scripting.Editors.Utils;
namespace Tango.Scripting.Editors.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]);
}
}
}
}
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