def on_touch_move(self, touch):
        if touch.grab_current is not self:
            return
        # calculate delta
        dy = abs(touch.y - touch.oy)
        if dy > 10:
            dy = min(dy - 10, 100)
            touch.ud[self.uid][1] = dy
            self.video.volume = dy / 100.
        return True
dataset/ETHPy150Open kivy/kivy/kivy/uix/videoplayer.py/VideoPlayerVolume.on_touch_move/original