lbry-desktop/src/renderer/component/menu.js

import React from 'react';
import PropTypes from 'prop-types';
import Icon from 'component/icon';
import Link from 'component/link';

export class DropDownMenuItem extends React.PureComponent {
  static propTypes = {
    href: PropTypes.string,
    label: PropTypes.string,
    icon: PropTypes.string,
    onClick: PropTypes.func,
  };

  static defaultProps = {
    iconPosition: 'left',
  };

  render() {
    const icon = this.props.icon ? <Icon icon={this.props.icon} fixed /> : null;

    return (
      <a
        className="menu__menu-item"
        onClick={this.props.onClick}
        href={this.props.href || 'javascript:'}
        label={this.props.label}
      >
        {this.props.iconPosition == 'left' ? icon : null}
        {this.props.label}
        {this.props.iconPosition == 'left' ? null : icon}
      </a>
    );
  }
}

export class DropDownMenu extends React.PureComponent {
  constructor(props) {
    super(props);

    this._isWindowClickBound = false;
    this._menuDiv = null;

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

  componentWillUnmount() {
    if (this._isWindowClickBound) {
      window.removeEventListener('click', this.handleWindowClick, false);
    }
  }

  handleMenuIconClick(e) {
    this.setState({
      menuOpen: !this.state.menuOpen,
    });
    if (!this.state.menuOpen && !this._isWindowClickBound) {
      this._isWindowClickBound = true;
      window.addEventListener('click', this.handleWindowClick, false);
      e.stopPropagation();
    }
    return false;
  }

  handleMenuClick(e) {
    // Event bubbles up to the menu after a link is clicked
    this.setState({
      menuOpen: false,
    });
  }

  /* this will force "this" to always be the class, even when passed to an event listener */
  handleWindowClick = e => {
    if (this.state.menuOpen && (!this._menuDiv || !this._menuDiv.contains(e.target))) {
      this.setState({
        menuOpen: false,
      });
    }
  };

  render() {
    if (!this.state.menuOpen && this._isWindowClickBound) {
      this._isWindowClickBound = false;
      window.removeEventListener('click', this.handleWindowClick, false);
    }
    return (
      <div className="menu-container">
        <Link
          ref={span => (this._menuButton = span)}
          button="text"
          icon="icon-ellipsis-v"
          onClick={event => {
            this.handleMenuIconClick(event);
          }}
        />
        {this.state.menuOpen ? (
          <div
            ref={div => (this._menuDiv = div)}
            className="menu"
            onClick={event => {
              this.handleMenuClick(event);
            }}
          >
            {this.props.children}
          </div>
        ) : null}
      </div>
    );
  }
}