react-accordion-with-header/es/AccordionPanel.js

React accordion component with flexbox header

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

import React, { PureComponent, Children, cloneElement } from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';

var defaultProps = {
  speed: 250
};

var defaultStyle = {
  overflow: 'hidden',
  padding: 0
};

var AccordionPanel = function (_PureComponent) {
  _inherits(AccordionPanel, _PureComponent);

  function AccordionPanel() {
    var _temp, _this, _ret;

    _classCallCheck(this, AccordionPanel);

    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    return _ret = (_temp = (_this = _possibleConstructorReturn(this, _PureComponent.call.apply(_PureComponent, [this].concat(args))), _this), _this.state = {
      panelHeight: 0
    }, _this.preloadImages = function () {
      var images = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

      var imagesLoaded = 0;
      var imgLoaded = function imgLoaded(data) {
        imagesLoaded++;
        if (imagesLoaded === images.length) _this.calcHeight();
      };
      images.forEach(function (element) {
        var img = new Image();
        img.src = element.src;
        img.onload = img.onerror = imgLoaded;
      });
    }, _this.calcHeight = function () {
      if (_this.componentRef) {
        var _panelHeight = _this.componentRef.current.clientHeight;

        _this.setState({ panelHeight: _panelHeight });
        return;
      }

      var panelHeight = Children.map(_this.props.children, function (child, i) {
        return _this.refs['item-' + child.props.key];
      }).reduce(function (previousValue, child) {
        return previousValue + child.clientHeight;
      }, _this.state.panelHeight);

      _this.setState({ panelHeight: panelHeight });
    }, _this.renderChildren = function () {
      if (!_this.props.template && !_this.props.children) {
        throw new Error('AccordionPanel must have at least one child!');
      }

      /***************************************************************
       create a ref so we calculate its height on componentDidMount()
       this way we know how high to expand the panel
       ***************************************************************/

      var wrapComponent = function wrapComponent(components) {
        return Children.map(components, function (child, index) {
          var WrappedComponent = React.forwardRef(function (props, ref) {
            _this.componentRef = ref;
            return React.createElement(
              'div',
              { ref: ref },
              child
            );
          });
          var ref = React.createRef();
          return React.createElement(WrappedComponent, { ref: ref });
        });
      };

      if (_this.props.template) {
        // for template prop that contains a class component
        console.warn('The template prop will be deprecated in the future. \n          Prefer passing in your component directly as children: https://reactjs.org/docs/composition-vs-inheritance.html');
        return wrapComponent(cloneElement(_this.props.template));
      }

      if (typeof _this.props.children.type === 'function') {
        // for children that are class components
        return wrapComponent(_this.props.children);
      }

      return Children.map(_this.props.children, function (child) {
        return cloneElement(child, {
          ref: 'item-' + child.props.key
        });
      });
    }, _temp), _possibleConstructorReturn(_this, _ret);
  }

  AccordionPanel.prototype.componentDidMount = function componentDidMount() {
    var bodyNode = this.accordionPanelRef;
    if (!bodyNode) return; // tests only?
    var images = bodyNode.querySelectorAll('img');

    if (images.length > 0) {
      this.preloadImages(images);
    } else {
      this.calcHeight();
    }
  };

  // Wait for images to load before calculating height of element


  AccordionPanel.prototype.render = function render() {
    var _this2 = this;

    var _props = this.props,
        className = _props.className,
        isExpanded = _props.isExpanded,
        style = _props.style,
        speed = _props.speed;


    var styles = {
      transition: 'all ' + (speed || defaultProps.speed) + 'ms ease-in-out',
      maxHeight: isExpanded ? this.state.panelHeight : 0,
      opacity: isExpanded ? 1 : 0
    };

    return React.createElement(
      'div',
      {
        ref: function ref(inst) {
          return _this2.accordionPanelRef = inst;
        },
        className: classNames(className, { 'is-expanded': isExpanded }),
        style: _extends({}, style, defaultStyle, styles)
      },
      this.renderChildren()
    );
  };

  return AccordionPanel;
}(PureComponent);

export { AccordionPanel as default };


AccordionPanel.propTypes = process.env.NODE_ENV !== "production" ? {
  className: PropTypes.string,
  style: PropTypes.object,
  speed: PropTypes.number,
  isExpanded: PropTypes.bool
} : {};
AccordionPanel.defaultProps = defaultProps;