class BlockModel:
    def __init__(self, x1, y1, x2, y2, color):
        self._x1 = x1
        self._y1 = y1
        self._x2 = x2
        self._y2 = y2
        self._color = color


    def move(self, dx, dy):
        self._x1 += dx
        self._x2 += dx
        self._y1 += dy
        self._y2 += dy



class View:
    _canvas = ...
    _cell_size = 70
    def __init__(self):
        pass



class BlockView(View):
    def __init__(self, block:BlockModel):
        self._block = block
        self._canvas_id = None


    def show(self):
        x1 = self._block._x1 * self._cell_size
        x2 = self._block._x2 * self._cell_size
        y1 = self._block._y1 * self._cell_size
        y2 = self._block._y2 * self._cell_size
        color = self._block._color

        self._canvas_id = _canvas.create_rectangle(
            x1, x2, y1, y2, fill=color,
            activefill="white", outline='#CD853F', width='2')


    def hide(self):
        self._canvas.delete(self._canvas_id)
        self._canvas_id = None



class BlockPresenter:
    def __init__(self, model:BlockModel, view:BlockView):
        self.model = model
        self.view = view
        self.view.show()


    def move(self, dx, dy):
        self.view.hide()
        self.model.move(dx, dy)
        self.view.show()