docbrown/app/javascript/CommentSubscription/CommentSubscription.jsx

import { h, Component } from 'preact';
import PropTypes from 'prop-types';
import {
  Button,
  ButtonGroup,
  Dropdown,
  FormField,
  RadioButton,
} from '@crayons';

const COMMENT_SUBSCRIPTION_TYPE = {
  ALL: 'all_comments',
  TOP: 'top_level_comments',
  AUTHOR: 'only_author_comments',
};

export class CommentSubscription extends Component {
  state = {
    showOptions: false,
    commentSubscriptionType: COMMENT_SUBSCRIPTION_TYPE.ALL,
    subscribed: false,
  };

  componentDidMount() {
    window.addEventListener('scroll', this.dropdownPlacementHandler);
  }

  componentDidUpdate() {
    const { showOptions } = this.state;

    if (showOptions) {
      this.dropdownPlacementHandler();
    }
  }

  componentWillUnmount() {
    window.removeEventListener('scroll', this.dropdownPlacementHandler);
  }

  dropdownPlacementHandler = () => {
    const { base: element } = this.dropdownElement;

    // Reset the top before doing any calculations
    element.style.bottom = '';

    const { bottom: dropDownBottom } = element.getBoundingClientRect();
    const { height } = this.buttonGroupElement.base.getBoundingClientRect();

    if (
      Math.sign(dropDownBottom) === -1 ||
      dropDownBottom > window.innerHeight
    ) {
      // The 4 pixels is the box shadow from the drop down.
      element.style.bottom = `${height + 4}px`;
    }
  };

  commentSubscriptionClick = (event) => {
    this.setState({
      commentSubscriptionType: event.target.value,
    });
  };

  render() {
    const { showOptions, commentSubscriptionType, subscribed } = this.state;
    const { onSubscribe, onUnsubscribe } = this.props;

    const CogIcon = () => (
      <svg
        xmlns="http://www.w3.org/2000/svg"
        width="24"
        height="24"
        role="img"
        aria-labelledby="ai2ols8ka2ohfp0z568lj68ic2du21s"
        className="crayons-icon"
      >
        <title id="ai2ols8ka2ohfp0z568lj68ic2du21s">Preferences</title>
        <path d="M12 1l9.5 5.5v11L12 23l-9.5-5.5v-11L12 1zm0 2.311L4.5 7.653v8.694l7.5 4.342 7.5-4.342V7.653L12 3.311zM12 16a4 4 0 110-8 4 4 0 010 8zm0-2a2 2 0 100-4 2 2 0 000 4z" />
      </svg>
    );

    return (
      <div className="relative">
        <ButtonGroup
          ref={(element) => {
            this.buttonGroupElement = element;
          }}
        >
          <Button
            variant="outlined"
            onClick={(_event) => {
              if (subscribed) {
                onUnsubscribe();
              } else {
                onSubscribe(commentSubscriptionType);
              }

              this.setState({ subscribed: !subscribed });
            }}
          >
            {subscribed ? 'Unsubscribe' : 'Subscribe'}
          </Button>
          {subscribed && (
            <Button
              variant="outlined"
              icon={CogIcon}
              onClick={(_event) => {
                this.setState({ showOptions: !showOptions });
              }}
            />
          )}
        </ButtonGroup>
        {subscribed && (
          <Dropdown
            className={showOptions ? 'inline-block w-full' : null}
            ref={(element) => {
              this.dropdownElement = element;
            }}
          >
            <div className="crayons-fields mb-5">
              <FormField variant="radio">
                <RadioButton
                  id="subscribe-all"
                  name="subscribe_comments"
                  value="all_comments"
                  checked={
                    commentSubscriptionType === COMMENT_SUBSCRIPTION_TYPE.ALL
                  }
                  onClick={this.commentSubscriptionClick}
                />
                <label htmlFor="subscribe-all" className="crayons-field__label">
                  All comments
                  <p className="crayons-field__description">
                    You’ll receive notifications for all new comments.
                  </p>
                </label>
              </FormField>

              <FormField variant="radio">
                <RadioButton
                  id="subscribe-toplevel"
                  name="subscribe_comments"
                  value="top_level_comments"
                  onClick={this.commentSubscriptionClick}
                  checked={
                    commentSubscriptionType === COMMENT_SUBSCRIPTION_TYPE.TOP
                  }
                />
                <label
                  htmlFor="subscribe-toplevel"
                  className="crayons-field__label"
                >
                  Top-level comments
                  <p className="crayons-field__description">
                    You’ll receive notifications only for all new top-level
                    comments.
                  </p>
                </label>
              </FormField>

              <FormField variant="radio">
                <RadioButton
                  id="subscribe-author"
                  name="subscribe_comments"
                  value="only_author_comments"
                  onClick={this.commentSubscriptionClick}
                  checked={
                    commentSubscriptionType === COMMENT_SUBSCRIPTION_TYPE.AUTHOR
                  }
                />
                <label
                  htmlFor="subscribe-author"
                  className="crayons-field__label"
                >
                  Post author comments
                  <p className="crayons-field__description">
                    You’ll receive notifications only if post author sends a new
                    comment.
                  </p>
                </label>
              </FormField>
            </div>

            <Button
              className="w-100"
              onClick={(_event) => {
                this.setState((prevState) => {
                  onSubscribe(prevState.commentSubscriptionType);

                  return { ...prevState, showOptions: false };
                });
              }}
            >
              Done
            </Button>
          </Dropdown>
        )}
      </div>
    );
  }
}

CommentSubscription.displayName = 'CommentSubscription';

CommentSubscription.propTypes = {
  onSubscribe: PropTypes.func.isRequired,
  onUnsubscribe: PropTypes.func.isRequired,
};