CHOMPStation2/tgui/packages/tgui_ch/components/TrackOutsideClicks.tsx

import { Component, createRef } from 'inferno';

type Props = {
  onOutsideClick: () => void;
};

export class TrackOutsideClicks extends Component<Props> {
  ref = createRef<HTMLDivElement>();

  constructor() {
    super();

    this.handleOutsideClick = this.handleOutsideClick.bind(this);

    document.addEventListener('click', this.handleOutsideClick);
  }

  componentWillUnmount() {
    document.removeEventListener('click', this.handleOutsideClick);
  }

  handleOutsideClick(event: MouseEvent) {
    if (!(event.target instanceof Node)) {
      return;
    }

    if (this.ref.current && !this.ref.current.contains(event.target)) {
      this.props.onOutsideClick();
    }
  }

  render() {
    return <div ref={this.ref}>{this.props.children}</div>;
  }
}