/// <summary>
/// Creates a pending undo transaction, which may be committed after the
/// undoable work is completed successfully, or rolledback in case of failure.
/// The <see cref="IUndoTransaction"/> implements <see cref="IDisposable"/>
/// and is intended for use inside a using clause, which rollback the transaction
/// automatically, if it is not commited within the scope.
/// </summary>
/// <param name="description">Description of the action to be performed</param>
/// <param name="undoState">An undo state snapshot from the UI thread, in case the transation is begun on another thread</param>
/// <returns>Transaction instance</returns>
public IUndoTransaction BeginTransaction(string description, IUndoState undoState = null)
{
if (InUndoRedo)
{
throw new InvalidOperationException(Resources.UndoManager_BeginTransaction_Undo_transaction_may_not_be_started_in_undo_redo);
}
// Inner transactions are ignored, since only the initial record is
// desired in the undo stack.
if (_pendingRecord != null)
{
return(new NoOpTransaction());
}
_pendingRecord = new UndoRecord(description, undoState ?? _client.GetUndoState());
return(new UndoTransaction(this));
}
public UndoRecord(string description, IUndoState undoState)
{
Description = description;
UndoState = undoState;
}
/// <summary>
/// Creates a pending undo transaction, which may be committed after the
/// undoable work is completed successfully, or rolledback in case of failure.
/// The <see cref="IUndoTransaction"/> implements <see cref="IDisposable"/>
/// and is intended for use inside a using clause, which rollback the transaction
/// automatically, if it is not commited within the scope.
/// </summary>
/// <param name="description">Description of the action to be performed</param>
/// <param name="undoState">An undo state snapshot from the UI thread, in case the transation is begun on another thread</param>
/// <returns>Transaction instance</returns>
public IUndoTransaction BeginTransaction(string description, IUndoState undoState = null)
{
if (InUndoRedo)
throw new InvalidOperationException(Resources.UndoManager_BeginTransaction_Undo_transaction_may_not_be_started_in_undo_redo);
// Inner transactions are ignored, since only the initial record is
// desired in the undo stack.
if (_pendingRecord != null)
return new NoOpTransaction();
_pendingRecord = new UndoRecord(description, undoState ?? _client.GetUndoState());
return new UndoTransaction(this);
}
public UndoRecord(string description, IUndoState undoState)
{
Description = description;
UndoState = undoState;
}
public UndoRecord(IUndoState undoState, string description = null)
{
UndoState = undoState;
Description = description;
}
