mastodon/app/assets/javascripts/components/features/ui/index.jsx

import ColumnsArea from './components/columns_area';
import NotificationsContainer from './containers/notifications_container';
import PureRenderMixin from 'react-addons-pure-render-mixin';
import LoadingBarContainer from './containers/loading_bar_container';
import HomeTimeline from '../home_timeline';
import MentionsTimeline from '../mentions_timeline';
import Compose from '../compose';
import TabsBar from './components/tabs_bar';
import ModalContainer from './containers/modal_container';
import Notifications from '../notifications';
import { debounce } from 'react-decoration';

const UI = React.createClass({

  getInitialState () {
    return {
      width: window.innerWidth
    };
  },

  mixins: [PureRenderMixin],

  @debounce(500)
  handleResize () {
    this.setState({ width: window.innerWidth });
  },

  componentWillMount () {
    window.addEventListener('resize', this.handleResize, { passive: true });
  },

  componentWillUnmount () {
    window.removeEventListener('resize', this.handleResize);
  },

  render () {
    const layoutBreakpoint = 1024;

    let mountedColumns;

    if (this.state.width <= layoutBreakpoint) {
      mountedColumns = (
        <ColumnsArea>
          {this.props.children}
        </ColumnsArea>
      );
    } else {
      mountedColumns = (
        <ColumnsArea>
          <Compose />
          <HomeTimeline trackScroll={false} />
          <Notifications trackScroll={false} />
          {this.props.children}
        </ColumnsArea>
      );
    }

    return (
      <div style={{ flex: '0 0 auto', display: 'flex', flexDirection: 'column', width: '100%', height: '100%', background: '#1a1c23' }}>
        <TabsBar />

        {mountedColumns}

        <NotificationsContainer />
        <LoadingBarContainer style={{ backgroundColor: '#2b90d9', left: '0', top: '0' }} />
        <ModalContainer />
      </div>
    );
  }

});

export default UI;