// 退回上一步
public void UnExecute()
{
foreach (IShape shape in _shapes)
{
_model.AddShape(shape);
}
}
//UnExecute
public void ReverseExecute()
{
foreach (Shape shape in _shapes)
{
_model.AddShape(shape);
}
}
// 刪除所有 shapes
public void BackExecute()
{
int length = _shapes.Count;
for (int count = 0; count < length; count++)
{
_model.AddShape(_shapes[count]);
}
}
// 加入 shape
public void Execute()
{
_model.AddShape(_shape);
}
