content: import React from 'react';
  import { connect } from 'react-redux';
  import PropTypes from 'prop-types';
  import Column from '../../components/column';
  import ColumnHeader from '../../components/column_header';
  import { mountConversations, unmountConversations, expandConversations } from '../../actions/conversations';
  import { addColumn, removeColumn, moveColumn } from '../../actions/columns';
  import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
  import { connectDirectStream } from '../../actions/streaming';
  import ConversationsListContainer from './containers/conversations_list_container';
  
  const messages = defineMessages({
    title: { id: 'column.direct', defaultMessage: 'Direct messages' },
  });
  
  export default @connect()
  @injectIntl
  class DirectTimeline extends React.PureComponent {
  
    static propTypes = {
      dispatch: PropTypes.func.isRequired,
      shouldUpdateScroll: PropTypes.func,
      columnId: PropTypes.string,
      intl: PropTypes.object.isRequired,
      hasUnread: PropTypes.bool,
      multiColumn: PropTypes.bool,
    };
  
    handlePin = () => {
      const { columnId, dispatch } = this.props;
  
      if (columnId) {
        dispatch(removeColumn(columnId));
      } else {
        dispatch(addColumn('DIRECT', {}));
      }
    }
  
    handleMove = (dir) => {
      const { columnId, dispatch } = this.props;
      dispatch(moveColumn(columnId, dir));
    }
  
    handleHeaderClick = () => {
      this.column.scrollTop();
    }
  
    componentDidMount () {
      const { dispatch } = this.props;
  
      dispatch(mountConversations());
      dispatch(expandConversations());
      this.disconnect = dispatch(connectDirectStream());
    }
  
    componentWillUnmount () {
      this.props.dispatch(unmountConversations());
  
      if (this.disconnect) {
        this.disconnect();
        this.disconnect = null;
      }
    }
  
    setRef = c => {
      this.column = c;
    }
  
    handleLoadMore = maxId => {
      this.props.dispatch(expandConversations({ maxId }));
    }
  
    render () {
      const { intl, hasUnread, columnId, multiColumn, shouldUpdateScroll } = this.props;
      const pinned = !!columnId;
  
      return (
        <Column bindToDocument={!multiColumn} ref={this.setRef} label={intl.formatMessage(messages.title)}>
          <ColumnHeader
            icon='envelope'
            active={hasUnread}
            title={intl.formatMessage(messages.title)}
            onPin={this.handlePin}
            onMove={this.handleMove}
            onClick={this.handleHeaderClick}
            pinned={pinned}
            multiColumn={multiColumn}
          />
  
          <ConversationsListContainer
            trackScroll={!pinned}
            scrollKey={`direct_timeline-${columnId}`}
            timelineId='direct'
            onLoadMore={this.handleLoadMore}
            emptyMessage={<FormattedMessage id='empty_column.direct' defaultMessage="You don't have any direct messages yet. When you send or receive one, it will show up here." />}
            shouldUpdateScroll={shouldUpdateScroll}
          />
        </Column>
      );
    }
  
  }
  