/// <summary>
///
/// </summary>
public void Undo()
{
if (CanUndo)
{
m_IsProcessing = true;
try
{
IUndoCommand command = m_Undo.Pop();
LogManager.Instance.WriteLine(LogVerbosity.Trace, "UndoRedo Undo({0}) : history list: {1} item(s)",
command.ToString(), m_Undo.Count);
command.Undo();
m_Redo.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 an undo operation.</summary>
/// <returns>A task representing the currently executing undo operation.</returns>
public Task Undo()
{
if ((_undoStack.Count == 0) || (_undoIndex < 0))
{
_undoIndex = -1;
return(Task.FromResult <object>(null));
}
try
{
IUndoCommand undo = _undoStack[_undoIndex--];
if (undo == null)
{
return(Task.FromResult <object>(null));
}
_cancelSource = new CancellationTokenSource();
_log.Print($"Executing undo command for '{undo.Description}'.", LoggingLevel.Simple);
Task task = undo.Undo(_cancelSource.Token);
if (_cancelSource.Token.IsCancellationRequested)
{
++_undoIndex;
}
return(task);
}
finally
{
_cancelSource?.Dispose();
_cancelSource = null;
}
}
public void Undo()
{
if (UndoCommands.Count == 0)
{
return;
}
IUndoCommand cmd = UndoCommands.Pop();
cmd.Undo();
RedoCommands.Push(cmd);
undoCallback();
}
public void Undo()
{
if (this.undoStack.Count > 0)
{
IUndoCommand command = UndoStatckPopCommand();
if (command == null)
{
return;
}
command.Undo();
ReverseStackPushCommand(command);
}
}
public void Undo()
{
if (mUndoCommands.Count == 0)
{
return;
}
IUndoCommand cmd = mUndoCommands.Pop();
cmd.Undo();
mRedoCommands.Push(cmd);
TextChangedEvent();
}
public void UndoCommand()
{
if (undoStack.Count == 0)
{
return;
}
IUndoCommand cmd = undoStack.Pop();
try
{
cmd.Undo();
view.IsModified = documentModifiedState;
}
finally
{
redoStack.Push(cmd);
RaiseCanExecuteChanged();
}
}
