let mut drawer = self.model.drawer.write().unwrap();
        let sr = &mut self.model.selection_rectangle;
        aabb.map_or_else(
            || {
                sr.map(|ref r| {
                    drawer.remove_drawable(r);
                    *sr = None;
                });
            },
            |bb| {
                let uuid = Uuid::new_v4();
                drawer.add_rect(&uuid, &bb);
                *sr = Some(uuid);
            }
        );