public Momento undo(Momento currentScreen)
{
Momento tempMomento = actionList.Last();
//undoneList.Add(tempMomento);
if (firstUndo == 0)
{
undoneList.Clear();
undoneList.Add(new Momento(currentScreen.getCanvasGraphicList()));
firstUndo = 1;
return(new Momento(tempMomento.getCanvasGraphicList()));
}
else
{
actionList.Remove(tempMomento);
undoneList.Add(new Momento(tempMomento.getCanvasGraphicList()));
if (actionList.Any())
{
return(new Momento(actionList.Last().getCanvasGraphicList()));
}
else
{
return(new Momento(tempMomento.getCanvasGraphicList()));
}
}
}
public Momento redo()
{
Momento tempMomento = undoneList.Last();
actionList.Add(new Momento(tempMomento.getCanvasGraphicList()));
undoneList.Remove(tempMomento);
return(new Momento(tempMomento.getCanvasGraphicList()));
}
public void add(Momento action)
{
if (firstUndo == 1)
{
firstUndo = 0;
}
else
{
actionList.Add(action);
}
undoneList.Clear();
}