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//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.
//
using System;
using System.Collections.Generic;
using Microsoft.VisualStudio.Utilities;
namespace Microsoft.VisualStudio.Text.Operations
{
/// <summary>
/// Contains undo transactions.
/// </summary>
/// <remarks>
/// Typically only one undo transaction history at a time is availbble to the user.
/// </remarks>
public interface ITextUndoHistory2 : ITextUndoHistory
{
/// <summary>
/// Creates a new transaction, invisible, nests it in the previously current transaction, and marks it current.
/// </summary>
/// <param name="description">The description of the transaction.</param>
/// <returns>The new transaction.</returns>
/// <remarks>
/// <para>Invisible transactions are like normal undo transactions except that they are effectively invisible to the end user. They won't be displayed
/// in the undo stack and if the user does an "undo" then all the invisible transactions leading up to the 1st non-invisible transaction are "skipped".</para>
/// <para>Invisible transactions can only contain simple text edits (other types of undo actions will be lost and potentially corrupt the undo stack).</para>
/// </remarks>
ITextUndoTransaction CreateInvisibleTransaction(string description);
}
}
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