Mailspring/app/internal_packages/composer/lib/account-contact-field.jsx

import React from 'react';
import PropTypes from 'prop-types';
import classnames from 'classnames';
import { AccountStore } from 'nylas-exports';
import { Menu, ButtonDropdown, InjectedComponentSet } from 'nylas-component-kit';

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

  static propTypes = {
    value: PropTypes.object,
    accounts: PropTypes.array,
    session: PropTypes.object.isRequired,
    draft: PropTypes.object.isRequired,
    onChange: PropTypes.func.isRequired,
  };

  _onChooseContact = contact => {
    this.props.onChange({ from: [contact] });
    this.props.session.ensureCorrectAccount();
    this._dropdownComponent.toggleDropdown();
  };

  _renderAccountSelector() {
    if (!this.props.value) {
      return <span />;
    }

    const label = this.props.value.toString();
    const multipleAccounts = this.props.accounts.length > 1;
    const hasAliases = this.props.accounts[0] && this.props.accounts[0].aliases.length > 0;

    if (multipleAccounts || hasAliases) {
      return (
        <ButtonDropdown
          ref={cm => {
            this._dropdownComponent = cm;
          }}
          bordered={false}
          primaryItem={<span>{label}</span>}
          menu={this._renderAccounts(this.props.accounts)}
        />
      );
    }
    return this._renderAccountSpan(label);
  }

  _renderAccountSpan = label => {
    return (
      <span className="from-single-name" style={{ position: 'relative', top: 13, left: '0.5em' }}>
        {label}
      </span>
    );
  };

  _renderMenuItem = contact => {
    const className = classnames({
      contact: true,
      'is-alias': contact.isAlias,
    });
    return <span className={className}>{contact.toString()}</span>;
  };

  _renderAccounts(accounts) {
    const items = AccountStore.aliasesFor(accounts);
    return (
      <Menu
        items={items}
        itemKey={contact => contact.id}
        itemContent={this._renderMenuItem}
        onSelect={this._onChooseContact}
      />
    );
  }

  _renderFromFieldComponents = () => {
    const { draft, session, accounts } = this.props;
    return (
      <InjectedComponentSet
        className="dropdown-component"
        matching={{ role: 'Composer:FromFieldComponents' }}
        exposedProps={{
          draft,
          session,
          accounts,
          currentAccount: draft.from[0],
        }}
      />
    );
  };

  render() {
    return (
      <div className="composer-participant-field from-field">
        <div className="composer-field-label">From:</div>
        {this._renderAccountSelector()}
        {this._renderFromFieldComponents()}
      </div>
    );
  }
}