S.P.L.U.R.T-Station-13/tgui/packages/tgui-panel/chat/ChatPanel.js

/**
 * @file
 * @copyright 2020 Aleksej Komarov
 * @license MIT
 */

import { shallowDiffers } from 'common/react';
import { Component, createRef } from 'inferno';
import { Button } from 'tgui/components';

import { chatRenderer } from './renderer';

export class ChatPanel extends Component {
  constructor() {
    super();
    this.ref = createRef();
    this.state = {
      scrollTracking: true,
    };
    this.handleScrollTrackingChange = value => this.setState({
      scrollTracking: value,
    });
  }

  componentDidMount() {
    chatRenderer.mount(this.ref.current);
    chatRenderer.events.on('scrollTrackingChanged',
      this.handleScrollTrackingChange);
    this.componentDidUpdate();
  }

  componentWillUnmount() {
    chatRenderer.events.off('scrollTrackingChanged',
      this.handleScrollTrackingChange);
  }

  componentDidUpdate(prevProps) {
    requestAnimationFrame(() => {
      chatRenderer.ensureScrollTracking();
    });
    const shouldUpdateStyle = (
      !prevProps || shallowDiffers(this.props, prevProps)
    );
    if (shouldUpdateStyle) {
      chatRenderer.assignStyle({
        'width': '100%',
        'white-space': 'pre-wrap',
        'font-size': this.props.fontSize,
        'line-height': this.props.lineHeight,
      });
    }
  }

  render() {
    const {
      scrollTracking,
    } = this.state;
    return (
      <>
        <div className="Chat" ref={this.ref} />
        {!scrollTracking && (
          <Button
            className="Chat__scrollButton"
            icon="arrow-down"
            onClick={() => chatRenderer.scrollToBottom()}>
            Scroll to bottom
          </Button>
        )}
      </>
    );
  }
}