/// <summary>
///
/// </summary>
public void Redo()
{
if (CanRedo)
{
m_IsProcessing = true;
try
{
IUndoCommand command = m_Redo.Pop();
LogManager.Instance.WriteLine(LogVerbosity.Trace, "UndoRedo Redo({0}) : history list: {1} item(s)",
command.ToString(), m_Undo.Count);
command.Redo();
m_Undo.Push(command);
OnPropertyChanged("CanUndo");
OnPropertyChanged("CanRedo");
if (UndoRedoCommandExecuted != null)
{
UndoRedoCommandExecuted(null, EventArgs.Empty);
}
}
catch (System.Exception ex)
{
throw ex;
}
finally
{
m_IsProcessing = false;
}
}
}
/// <summary>Function to perform a redo operation.</summary>
/// <returns>A task representing the currently executing redo operation.</returns>
public Task Redo()
{
if ((_undoStack.Count == 0) || (_undoIndex >= _undoStack.Count - 1))
{
_undoIndex = _undoStack.Count - 1;
return(Task.FromResult <object>(null));
}
try
{
IUndoCommand redo = _undoStack[++_undoIndex];
if (redo == null)
{
return(Task.FromResult <object>(null));
}
_cancelSource = new CancellationTokenSource();
_log.Print($"Executing redo for '{redo.Description}' command.", LoggingLevel.Simple);
Task task = redo.Redo(_cancelSource.Token);
if (_cancelSource.Token.IsCancellationRequested)
{
--_undoIndex;
}
return(task);
}
finally
{
_cancelSource?.Dispose();
_cancelSource = null;
}
}
public void RedoCommand()
{
if (redoStack.Count == 0)
{
return;
}
IUndoCommand cmd = redoStack.Pop();
try
{
cmd.Redo();
//if (!CanRedo()) (Env.Current.MainWindow as MainForm).redoButton.Enabled = false;
documentModifiedState = view.IsModified;
view.IsModified = true;
}
finally
{
undoStack.Push(cmd);
RaiseCanExecuteChanged();
//(Env.Current.MainWindow as MainForm).undoButton.Enabled = true;
}
}