1-container-with-event.js

class UserListContainer extends React.Component {
  ...

  toggleActive (event) {
    // event logic
  }

  render () {
    return (
      <UserList users={this.state.users} toggleActive={this.toggleActive} />
    );
  }
}

2-presentational.js

const UserList = (props) => {
  return (
    <ul>
      {props.users.map(user => {
        return (
          <li key={user.id}>
            <input type="checkbox" onChange={props.toggleActive} />
            {user.name}
          </li>
        );
      })}
    </ul>
  );
};