How to get Accounts.onLogin to impact my app in Meteor React ES6?

Question

I want my meteor app to call setState in App on login and logout. How can I have one section of code (ie: Accounts.onLogon) affect inside another component (ie App{})? Also, what to do to detect logouts?

Accounts.onLogin(function(user){
    console.log('hi');
    //App.showPrivate();
});

class App extends Component {
  constructor(props) {
    super(props);

    this.state = {
      showPublic: false,
    };
  }

  toggleShowPublic() {
    this.setState({
      showPublic: !this.state.showPublic,
    });
  }

  showPublic() {
    this.setState({
      showPublic: true,
    });
  }

  showPrivate() {
    this.setState({
      showPublic: false,
    });
  }

  render() {
    return (
      <div className="container">
        <div className="show-public" onClick={this.toggleShowPublic.bind(this)}>
          {this.state.showPublic ?
            <span className="private-public"> View private</span> :
            <span className="private-public"> View public </span>
          }
        </div>
      </div>
    );
  }
}

Answer 1

It turns out Accounts.onLogin is a distraction. To have the app update when the user logs in or out, we need to see when the logged in user changes, and react accordingly. Seeing when something changes in React is done using componentWillReceiveProps, as seen below:

componentWillReceiveProps(nextProps) {
  // user just logged in/out
  if (!this.props.currentUser  &&  nextProps.currentUser) {
    this.setState({ showPublic: false });
  }
}

oh, and current users comes from:

export default createContainer(() => {
  return {
    currentUser: Meteor.user(),
  };
}, App);