mastodon/app/javascript/mastodon/components/status_content.js

import React from 'react';
import ImmutablePropTypes from 'react-immutable-proptypes';
import PropTypes from 'prop-types';
import { FormattedMessage } from 'react-intl';
import Permalink from './permalink';
import classnames from 'classnames';
import PollContainer from 'mastodon/containers/poll_container';
import { autoPlayGif } from 'mastodon/initial_state';

const MAX_HEIGHT = 642; // 20px * 32 (+ 2px padding at the top)

export default class StatusContent extends React.PureComponent {

  static contextTypes = {
    router: PropTypes.object,
  };

  static propTypes = {
    status           : ImmutablePropTypes.map.isRequired,
    expanded         : PropTypes.bool,
    showThread       : PropTypes.bool,
    onExpandedToggle : PropTypes.func,
    onClick          : PropTypes.func,
    collapsable      : PropTypes.bool,
    onCollapsedToggle: PropTypes.func,
  };

  state = {
    hidden: true,
  };

  _updateStatusLinks() {
    const node = this.node;

    if (!node) {
      return;
    }

    const links = node.querySelectorAll('a');

    for (var i = 0; i < links.length; ++i) {
      let link = links[i];
      if (link.classList.contains('status-link')) {
        continue;
      }
      link.classList.add('status-link');

      let mention = this.props.status.get('mentions').find(item => link.href === item.get('url'));

      if (mention) {
        link.addEventListener('click', this.onMentionClick.bind(this, mention), false);
        link.setAttribute('title', mention.get('acct'));
      } else if (link.textContent[0] === '#' || (link.previousSibling && link.previousSibling.textContent && link.previousSibling.textContent[link.previousSibling.textContent.length - 1] === '#')) {
        link.addEventListener('click', this.onHashtagClick.bind(this, link.text), false);
      } else {
        link.setAttribute('title', link.href);
        link.classList.add('unhandled-link');
      }

      link.setAttribute('target', '_blank');
      link.setAttribute('rel', 'noopener noreferrer');
    }

    if (this.props.status.get('collapsed', null) === null) {
      let collapsed =
        this.props.collapsable
        && this.props.onClick
        && node.clientHeight > MAX_HEIGHT
        && this.props.status.get('spoiler_text').length === 0;

      if (this.props.onCollapsedToggle) this.props.onCollapsedToggle(collapsed);

      this.props.status.set('collapsed', collapsed);
    }
  }

  handleMouseEnter = ({ currentTarget }) => {
    if (autoPlayGif) {
      return;
    }

    const emojis = currentTarget.querySelectorAll('.custom-emoji');

    for (var i = 0; i < emojis.length; i++) {
      let emoji = emojis[i];
      emoji.src = emoji.getAttribute('data-original');
    }
  }

  handleMouseLeave = ({ currentTarget }) => {
    if (autoPlayGif) {
      return;
    }

    const emojis = currentTarget.querySelectorAll('.custom-emoji');

    for (var i = 0; i < emojis.length; i++) {
      let emoji = emojis[i];
      emoji.src = emoji.getAttribute('data-static');
    }
  }

  componentDidMount() {
    this._updateStatusLinks();
  }

  componentDidUpdate() {
    this._updateStatusLinks();
  }

  onMentionClick = (mention, e) => {
    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      this.context.router.history.push(`/@${mention.get('acct')}`);
    }
  };

  onHashtagClick = (hashtag, e) => {
    hashtag = hashtag.replace(/^#/, '');

    if (this.context.router && e.button === 0 && !(e.ctrlKey || e.metaKey)) {
      e.preventDefault();
      this.context.router.history.push(`/tags/${hashtag}`);
    }
  };

  handleMouseDown = (e) => {
    this.startXY = [e.clientX, e.clientY];
  };

  handleMouseUp = (e) => {
    if (!this.startXY) {
      return;
    }

    const [startX, startY] = this.startXY;
    const [deltaX, deltaY] = [Math.abs(e.clientX - startX), Math.abs(e.clientY - startY)];

    let element = e.target;
    while (element) {
      if (element.localName === 'button' || element.localName === 'a' || element.localName === 'label') {
        return;
      }
      element = element.parentNode;
    }

    if (deltaX + deltaY < 5 && e.button === 0 && this.props.onClick) {
      this.props.onClick();
    }

    this.startXY = null;
  };

  handleSpoilerClick = (e) => {
    e.preventDefault();

    if (this.props.onExpandedToggle) {
      // The parent manages the state
      this.props.onExpandedToggle();
    } else {
      this.setState({ hidden: !this.state.hidden });
    }
  };

  setRef = (c) => {
    this.node = c;
  };

  render() {
    const { status } = this.props;

    const hidden = this.props.onExpandedToggle ? !this.props.expanded : this.state.hidden;
    const renderReadMore = this.props.onClick && status.get('collapsed');
    const renderViewThread = this.props.showThread && status.get('in_reply_to_id') && status.get('in_reply_to_account_id') === status.getIn(['account', 'id']);

    const content = { __html: status.get('contentHtml') };
    const spoilerContent = { __html: status.get('spoilerHtml') };
    const classNames = classnames('status__content', {
      'status__content--with-action' : this.props.onClick && this.context.router,
      'status__content--with-spoiler': status.get('spoiler_text').length > 0,
      'status__content--collapsed'   : renderReadMore,
    });

    const showThreadButton = (
      <button
        className='status__content__read-more-button'
        onClick={this.props.onClick}
      >
        <i className='fa fa-arrow-right' />
        <span className='see-more'>
          <FormattedMessage
            id='status.show_thread'
            defaultMessage='Show thread'
          />
        </span >
      </button >
    );

    const readMoreButton = (
      <button
        className='status__content__read-more-button'
        onClick={this.props.onClick}
        key='read-more'
      >
        <i className='fa fa-comment' />
        <span className='see-more'>

          <FormattedMessage
            id='status.read_more'
            defaultMessage='Read more'
          />
        </span >
      </button >
    );

    if (status.get('spoiler_text').length > 0) {
      let mentionsPlaceholder = '';

      const mentionLinks = status.get('mentions').map(item => (
        <Permalink to={`/@${item.get('acct')}`} href={item.get('url')} key={item.get('id')} className='mention'>
          @<span>{item.get('username')}</span>
        </Permalink>
      )).reduce((aggregate, item) => [...aggregate, item, ' '], []);

      const toggleText = hidden ? (<FormattedMessage
        id='status.show_more'
        defaultMessage='Show more'
      />) : (<FormattedMessage
        id='status.show_less'
        defaultMessage='Show less'
      />);

      if (hidden) {
        mentionsPlaceholder = <div >{mentionLinks}</div >;
      }

      return (
        <div className={classNames} ref={this.setRef} tabIndex='0' onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp} onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
          <p style={{ marginBottom: hidden && status.get('mentions').isEmpty() ? '0px' : null }}>
            <span dangerouslySetInnerHTML={spoilerContent} className='translate' />
            {' '}
            <button
              tabIndex='0'
              className={`status__content__spoiler-link ${hidden ? 'status__content__spoiler-link--show-more' : 'status__content__spoiler-link--show-less'}`}
              onClick={this.handleSpoilerClick}
            >{toggleText}</button >
          </p >

          {mentionsPlaceholder}

          <div tabIndex={!hidden ? 0 : null} className={`status__content__text ${!hidden ? 'status__content__text--visible' : ''} translate`} dangerouslySetInnerHTML={content} />

          {!hidden && !!status.get('poll') && <PollContainer pollId={status.get('poll')} />}

          {renderViewThread && showThreadButton}
        </div >
      );
    } else if (this.props.onClick) {
      const output = [
        <div className={classNames} ref={this.setRef} tabIndex='0' onMouseDown={this.handleMouseDown} onMouseUp={this.handleMouseUp} key='status-content' onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
          <div className='status__content__text status__content__text--visible translate' dangerouslySetInnerHTML={content} />

          {!!status.get('poll') && <PollContainer pollId={status.get('poll')} />}

          {renderViewThread && showThreadButton}
        </div >,
      ];

      if (renderReadMore) {
        output.push(readMoreButton);
      }

      return output;
    } else {
      return (
        <div className={classNames} ref={this.setRef} tabIndex='0' onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
          <div className='status__content__text status__content__text--visible translate' dangerouslySetInnerHTML={content} />

          {!!status.get('poll') && <PollContainer pollId={status.get('poll')} />}

          {renderViewThread && showThreadButton}
        </div >
      );
    }
  }

}