public IUndoRedo Exec()
{
var undoList = new UndoRedoCollection(Type);
// add the inverse operation of every element to the undoList to be
// returned and possibly [un/re]done later
foreach (var ur in undoRedos)
{
undoList.Add(ur.Exec());
}
return(undoList);
}
// exec the current popped undo and then pop it onto the redo stack
public void DoUndo()
{
UndoRedoCollection redo = (UndoRedoCollection)undos.Pop().Exec();
redos.Push(new UndoRedoCollection(redo.Type, redo));
}
public void AddUndo(UndoRedoCollection ur)
{
undos.Push(ur);
}