sclass JChatConvo extends SingleComponentPanel {

  JLabel label;

  L<Post> posts = synchroList();

  // params = contents, right, contents, right, ...

  *(O... params) {

    for (int i = 0; i+1 < l(params); i += 2)

      addPost(strUnnull(params[i]), isTrue(params[i+1])); // TODO: update only once

    setComponent(withMargin(label = jTopLabel()));

    onResize(label, r update);

  }

  srecord Post(S html, bool right) {}

  selfType addPost(S html, bool right) {

    swing {

      posts.add(new Post(html, right));

      updateAndScrollDown();

    }

    this;

  }

  void clearPosts {

    posts.clear();

    update();

  }

  void usePostsList(L<Post> posts) {

    this.posts = assertNotNull(posts);

    updateAndScrollDown();

  }

  void update swing {

    if (label == null) ret;

    setText(label, hhtml(htmlForJLabel_chatConvo_table(

      cloneMap(posts, p -> pair(p.html, p.right)), label.getWidth())));

  }

  void updateAndScrollDown {

    update();

    scrollDown();

  }

  void scrollDown {

    scrollAllTheWayDown(JChatConvo.this);

  }

  L<Post> posts() { ret cloneList(posts); }

}