public IAction Redo()
{
if (redoStack.Count > 0)
{
IUndoableAction action = null;
while (redoStack.Count > 0)
{
action = redoStack.Pop();
Logger.Log(LOGKEY, "redo action: " + action.ToString());
if (BeforePerformAction != null)
{
var arg = new ActionEventArgs(action, ActionBehavior.Redo);
BeforePerformAction(this, arg);
if (arg.Cancel)
{
break;
}
}
action.Redo();
undoStack.Add(action);
AfterPerformAction?.Invoke(this, new ActionEventArgs(action, ActionBehavior.Redo));
if (!(action is ISerialUndoAction))
{
break;
}
}
return(action);
}
else
{
return(null);
}
}
public IAction Undo()
{
if (undoStack.Count() > 0)
{
IUndoableAction action = null;
while (undoStack.Count > 0)
{
action = undoStack.Last();
Logger.Log(LOGKEY, "undo action: " + action.ToString());
// before event
if (BeforePerformAction != null)
{
var arg = new ActionEventArgs(action, ActionBehavior.Undo);
BeforePerformAction(this, new ActionEventArgs(action, ActionBehavior.Undo));
if (arg.Cancel)
{
break;
}
}
undoStack.Remove(action);
action.Undo();
redoStack.Push(action);
// after event
AfterPerformAction?.Invoke(this, new ActionEventArgs(action, ActionBehavior.Undo));
if (!(action is ISerialUndoAction))
{
break;
}
}
return(action);
}
return(null);
}