nas/app/javascript/mastodon/features/compose/components/circle_dropdown.jsx

import PropTypes from 'prop-types';
import { PureComponent } from 'react';

import { injectIntl, defineMessages } from 'react-intl';

import classNames from 'classnames';

import ImmutablePropTypes from 'react-immutable-proptypes';

import { supportsPassiveEvents } from 'detect-passive-events';
import Overlay from 'react-overlays/Overlay';

import CircleIcon from '@/material-icons/400-24px/account_circle.svg?react';
import { Icon }  from 'mastodon/components/icon';

const messages = defineMessages({
  add_expiration: { id: 'status.expiration.add', defaultMessage: 'Set status expiration' },
});

const listenerOptions = supportsPassiveEvents ? { passive: true, capture: true } : true;

class CircleDropdownMenu extends PureComponent {

  static propTypes = {
    style: PropTypes.object,
    items: PropTypes.array.isRequired,
    value: PropTypes.string,
    onClose: PropTypes.func.isRequired,
    onChange: PropTypes.func.isRequired,
  };

  handleDocumentClick = e => {
    if (this.node && !this.node.contains(e.target)) {
      this.props.onClose();
      e.stopPropagation();
    }
  };

  handleKeyDown = e => {
    const { items } = this.props;
    const value = e.currentTarget.getAttribute('data-index');
    const index = items.findIndex(item => {
      return (item.value === value);
    });
    let element = null;

    switch(e.key) {
    case 'Escape':
      this.props.onClose();
      break;
    case 'Enter':
      this.handleClick(e);
      break;
    case 'ArrowDown':
      element = this.node.childNodes[index + 1] || this.node.firstChild;
      break;
    case 'ArrowUp':
      element = this.node.childNodes[index - 1] || this.node.lastChild;
      break;
    case 'Tab':
      if (e.shiftKey) {
        element = this.node.childNodes[index - 1] || this.node.lastChild;
      } else {
        element = this.node.childNodes[index + 1] || this.node.firstChild;
      }
      break;
    case 'Home':
      element = this.node.firstChild;
      break;
    case 'End':
      element = this.node.lastChild;
      break;
    }

    if (element) {
      element.focus();
      this.props.onChange(element.getAttribute('data-index'));
      e.preventDefault();
      e.stopPropagation();
    }
  };

  handleClick = e => {
    const value = e.currentTarget.getAttribute('data-index');

    e.preventDefault();

    this.props.onClose();
    this.props.onChange(value);
  };

  componentDidMount () {
    document.addEventListener('click', this.handleDocumentClick, { capture: true });
    document.addEventListener('touchend', this.handleDocumentClick, listenerOptions);
    if (this.focusedItem) this.focusedItem.focus({ preventScroll: true });
  }

  componentWillUnmount () {
    document.removeEventListener('click', this.handleDocumentClick, { capture: true });
    document.removeEventListener('touchend', this.handleDocumentClick, listenerOptions);
  }

  setRef = c => {
    this.node = c;
  };

  setFocusRef = c => {
    this.focusedItem = c;
  };

  render () {
    const { style, items, value } = this.props;

    return (
      <div style={{ ...style }} role='listbox' ref={this.setRef}>
        {items.map(item => (
          <div role='option' tabIndex='0' key={item.value} data-index={item.value} onKeyDown={this.handleKeyDown} onClick={this.handleClick} className={classNames('privacy-dropdown__option', { active: item.value === value })} aria-selected={item.value === value} ref={item.value === value ? this.setFocusRef : null}>
            <div className='privacy-dropdown__option__content'>
              <strong>{item.text}</strong>
            </div>
          </div>
        ))}
      </div>
    );
  }

}

class CircleDropdown extends PureComponent {

  static propTypes = {
    isUserTouching: PropTypes.func,
    onModalOpen: PropTypes.func,
    onModalClose: PropTypes.func,
    onChange: PropTypes.func.isRequired,
    noDirect: PropTypes.bool,
    container: PropTypes.func,
    disabled: PropTypes.bool,
    circles: ImmutablePropTypes.map,
    circleId: PropTypes.string,
    unavailable: PropTypes.bool,
    intl: PropTypes.object.isRequired,
  };

  state = {
    open: false,
    placement: 'bottom',
  };

  handleToggle = () => {
    if (this.state.open && this.activeElement) {
      this.activeElement.focus({ preventScroll: true });
    }

    this.setState({ open: !this.state.open });
  };

  handleModalActionClick = (e) => {
    e.preventDefault();

    const { value } = this.options[e.currentTarget.getAttribute('data-index')];

    this.props.onModalClose();
    this.props.onChange(value);
  };

  handleKeyDown = e => {
    switch(e.key) {
    case 'Escape':
      this.handleClose();
      break;
    }
  };

  handleMouseDown = () => {
    if (!this.state.open) {
      this.activeElement = document.activeElement;
    }
  };

  handleButtonKeyDown = (e) => {
    switch(e.key) {
    case ' ':
    case 'Enter':
      this.handleMouseDown();
      break;
    }
  };

  handleClose = () => {
    if (this.state.open && this.activeElement) {
      this.activeElement.focus({ preventScroll: true });
    }
    this.setState({ open: false });
  };

  handleChange = value => {
    this.props.onChange(value);
  };

  setTargetRef = c => {
    this.target = c;
  };

  findTarget = () => {
    return this.target;
  };

  handleOverlayEnter = (state) => {
    this.setState({ placement: state.placement });
  };

  render () {
    const { container, disabled, intl, unavailable, circles, circleId } = this.props;
    const { open, placement } = this.state;

    if (unavailable) {
      return null;
    }

    const listOptions = circles.toArray().filter((circle) => circle && circle.length > 1).map((circle) => {
      return circle[1] ? { value: circle[1].get('id'), text: circle[1].get('title') } : null;
    }).filter((opt) => opt !== null);
    const listOption = listOptions.find((opt) => opt.value === circleId) ?? { value: '0', text: 'Unselected' };

    return (
      <div ref={this.setTargetRef} onKeyDown={this.handleKeyDown}>
        <button
          type='button'
          title={intl.formatMessage(messages.add_expiration)}
          aria-expanded={open}
          onClick={this.handleToggle}
          onMouseDown={this.handleMouseDown}
          onKeyDown={this.handleButtonKeyDown}
          disabled={disabled}
          className={classNames('dropdown-button', { active: open })}
        >
          <Icon id='clock-o' icon={CircleIcon} />
          <span className='dropdown-button__label'>{listOption.text}</span>
        </button>

        <Overlay show={open} offset={[5, 5]} placement={placement} flip target={this.findTarget} container={container} popperConfig={{ strategy: 'fixed', onFirstUpdate: this.handleOverlayEnter }}>
          {({ props, placement }) => (
            <div {...props}>
              <div className={`dropdown-animation privacy-dropdown__dropdown ${placement}`}>
                <CircleDropdownMenu
                  items={listOptions}
                  value={circleId}
                  onClose={this.handleClose}
                  onChange={this.handleChange}
                />
              </div>
            </div>
          )}
        </Overlay>
      </div>
    );
  }

}

export default injectIntl(CircleDropdown);