Mailspring/app/internal_packages/open-tracking/lib/open-tracking-message-status.jsx

import { localized, React, ReactDOM, Actions, PropTypes } from 'mailspring-exports';
import { RetinaImg } from 'mailspring-component-kit';
import OpenTrackingMessagePopover from './open-tracking-message-popover';
import { PLUGIN_ID } from './open-tracking-constants';

export default class OpenTrackingMessageStatus extends React.Component {
  static displayName = 'OpenTrackingMessageStatus';

  static propTypes = {
    message: PropTypes.object.isRequired,
  };

  static containerStyles = {
    paddingTop: 4,
  };

  onMouseDown = () => {
    const rect = ReactDOM.findDOMNode(this).getBoundingClientRect();
    Actions.openPopover(
      <OpenTrackingMessagePopover
        message={this.props.message}
        openMetadata={this.props.message.metadataForPluginId(PLUGIN_ID)}
      />,
      { originRect: rect, direction: 'down' }
    );
  };

  _getDataFromMessage() {
    const metadata = this.props.message.metadataForPluginId(PLUGIN_ID);
    if (!metadata || metadata.open_count == null) {
      return {
        hasMetadata: false,
        openCount: null,
        opened: false,
      };
    }
    return {
      hasMetadata: true,
      openCount: metadata.open_count,
      opened: metadata.open_count > 0,
    };
  }

  render() {
    const { hasMetadata, openCount, opened } = this._getDataFromMessage();

    if (!hasMetadata) return false;
    const noun = openCount === 1 ? localized('Open') : localized('Opens');
    let count = openCount;
    if (openCount > 999) {
      count = '999+';
    }

    const text = opened ? `${count} ${noun.toLocaleLowerCase()}` : localized('No opens');
    return (
      <span
        className={`open-tracking-message-status ${opened ? 'opened' : 'unopened'}`}
        onMouseDown={opened ? this.onMouseDown : null}
      >
        {
          <RetinaImg
            className={opened ? 'opened' : 'unopened'}
            style={{ position: 'relative', top: -1 }}
            url="mailspring://open-tracking/assets/InMessage-opened@2x.png"
            mode={RetinaImg.Mode.ContentIsMask}
          />
        }&nbsp;&nbsp;{text}
      </span>
    );
  }
}