CT/src/View/ChatPages/messagePage.tsx

import "./messagePage.css";

import * as React from "bloatless-react";

import { ChatMessageViewModelToView } from "../Components/chatMessage";
import MessagePageViewModel from "../../ViewModel/Pages/messagePageViewModel";
import { translations } from "../translations";

export function MessagePage(messagePageViewModel: MessagePageViewModel) {
  messagePageViewModel.loadMessages();

  const messageContainer = (
    <div
      id="message-container"
      children:append={[
        messagePageViewModel.chatMessageViewModels,
        ChatMessageViewModelToView,
      ]}
    ></div>
  );

  function scrollDown() {
    messageContainer.scrollTop = messageContainer.scrollHeight;
  }
  function scrollDownIfApplicable() {
    const scrollFromBottom =
      messageContainer.scrollHeight -
      (messageContainer.scrollTop + messageContainer.offsetHeight);
    if (scrollFromBottom > 400) return;

    scrollDown();
  }
  messagePageViewModel.chatMessageViewModels.subscribeSilent(
    scrollDownIfApplicable
  );
  setTimeout(() => scrollDown(), 100);

  return (
    <div id="message-page">
      <div class="pane">
        <div class="toolbar">
          <span>{translations.chatPage.message.messagesHeadline}</span>
        </div>
        <div class="content">
          {messageContainer}
          <div id="composer">
            <div class="content-width-constraint">
              <div class="input-width-constraint">
                <input
                  bind:value={messagePageViewModel.composingMessage}
                  on:enter={messagePageViewModel.sendMessage}
                  placeholder={
                    translations.chatPage.message.composerInputPlaceholder
                  }
                ></input>
                <button
                  class="primary"
                  aria-label={
                    translations.chatPage.message.sendMessageButtonAudioLabel
                  }
                  on:click={messagePageViewModel.sendMessage}
                  toggle:disabled={messagePageViewModel.cannotSendMessage}
                >
                  <span class="icon">send</span>
                </button>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}