def on_touch_down(self, touch):
if self.collide_point(touch.x, touch.y):
if self.left_block is not None:
self.left_block.right_block = None
self.left_block.unbind()
self.left_block = None
if self.up_block is not None:
self.up_block.command = self.up_block.type + str(self.up_block.id) + "1"
self.up_block.bottom_block = None
self.up_block.unbind()
self.up_block = None
self.left_block = None
self.selected = True
click_sound.play()
return RelativeLayout.on_touch_down(self, touch)
