def _keep_child_in_rect(self):
self._child_position.x = clamp(<EOL>self._child_position.x,<EOL>-self.child.padded_rect.left,<EOL>self.rect.width - self.child.padded_rect.right,<EOL>)<EOL>self._child_position.y = clamp(<EOL>self._child_position.y,<EOL>-self.child.padded_rect.bottom,<EOL>self.rect.height - self.child.padded_rect.top,<EOL>)<EOL>
Update the child position vector to make sure the child can't translate 
outside the mover.