def grab(self, class_instance, exclusive=False):
        if not self.is_touch:
            raise Exception('Grab works only for Touch MotionEvents.')
        if self.grab_exclusive_class is not None:
            raise Exception('Cannot grab the touch, touch is exclusive')
        class_instance = weakref.ref(class_instance.__self__)
        if exclusive:
            self.grab_exclusive_class = class_instance
        self.grab_list.append(class_instance)
Grab this motion event. You can grab a touch if you want
dataset/ETHPy150Open kivy/kivy/kivy/input/motionevent.py/MotionEvent.grab