@crossfield/react-read-more/dist/index.js

Read more container that expands html elements to their full height

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

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; }

var ReadMore = function (_React$Component) {
  _inherits(ReadMore, _React$Component);

  function ReadMore(_ref) {
    var initialHeight = _ref.initialHeight;

    _classCallCheck(this, ReadMore);

    var _this = _possibleConstructorReturn(this, (ReadMore.__proto__ || Object.getPrototypeOf(ReadMore)).call(this));

    _this.state = { initialHeight: initialHeight, maxHeight: initialHeight };
    return _this;
  }

  _createClass(ReadMore, [{
    key: 'toggle',
    value: function toggle() {
      var _state = this.state,
          maxHeight = _state.maxHeight,
          initialHeight = _state.initialHeight;

      //if expanded, close it

      if (maxHeight !== initialHeight) return this.setState({ maxHeight: initialHeight });

      var height = this.calculateHeight();

      //set the full height
      this.setState({ maxHeight: height });
    }
  }, {
    key: 'calculateHeight',
    value: function calculateHeight() {
      //calculate height of all the children
      var children = [].concat(_toConsumableArray(this.container.children));
      var height = 0;
      children.forEach(function (child) {
        return height += child.offsetHeight;
      });

      return height;
    }
  }, {
    key: 'componentDidMount',
    value: function componentDidMount() {
      if (this.calculateHeight() <= this.props.initialHeight) this.setState({ hideReadMore: true });
    }
  }, {
    key: 'render',
    value: function render() {
      var _this2 = this;

      var _props = this.props,
          children = _props.children,
          readMore = _props.readMore,
          blurStyle = _props.blurStyle,
          overhangSize = _props.overhangSize;
      var _state2 = this.state,
          maxHeight = _state2.maxHeight,
          initialHeight = _state2.initialHeight,
          hideReadMore = _state2.hideReadMore;

      var open = maxHeight !== initialHeight;

      return _react2.default.createElement(
        _react2.default.Fragment,
        null,
        _react2.default.createElement(
          'div',
          {
            className: 'readmore container',
            style: {
              maxHeight: open ? maxHeight : maxHeight - overhangSize,
              transition: 'max-height .5s ease',
              position: 'relative',
              overflow: 'hidden'
            },
            ref: function ref(el) {
              return _this2.container = el;
            }
          },
          children,
          hideReadMore ? null : _react2.default.createElement('div', {
            className: 'readmore overhang',
            style: Object.assign({
              transition: 'opacity 0.25s',
              opacity: open ? 0 : 1,
              backgroundImage: 'linear-gradient(to bottom, rgba(255, 255, 255, 0.44), #ffffff )',
              content: '',
              height: overhangSize + 'px',
              width: '100%',
              position: 'absolute',
              bottom: '0',
              left: '0'
            }, blurStyle)
          })
        ),
        hideReadMore ? null : readMore({
          open: open,
          onClick: function onClick() {
            return _this2.toggle();
          }
        })
      );
    }
  }]);

  return ReadMore;
}(_react2.default.Component);

ReadMore.defaultProps = {
  overhangSize: 160
};

exports.default = ReadMore;