react-virtualized/dist/commonjs/ScrollSync/ScrollSync.js

React components for efficiently rendering large, scrollable lists and tabular data

'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 _reactAddonsShallowCompare = require('react-addons-shallow-compare');

var _reactAddonsShallowCompare2 = _interopRequireDefault(_reactAddonsShallowCompare);

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

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; }

/**
 * HOC that simplifies the process of synchronizing scrolling between two or more virtualized components.
 */

var ScrollSync = function (_Component) {
  _inherits(ScrollSync, _Component);

  function ScrollSync(props, context) {
    _classCallCheck(this, ScrollSync);

    var _this = _possibleConstructorReturn(this, Object.getPrototypeOf(ScrollSync).call(this, props, context));

    _this.state = {
      clientHeight: 0,
      clientWidth: 0,
      scrollHeight: 0,
      scrollLeft: 0,
      scrollTop: 0,
      scrollWidth: 0
    };

    _this._onScroll = _this._onScroll.bind(_this);
    return _this;
  }

  _createClass(ScrollSync, [{
    key: 'render',
    value: function render() {
      var children = this.props.children;
      var _state = this.state;
      var clientHeight = _state.clientHeight;
      var clientWidth = _state.clientWidth;
      var scrollHeight = _state.scrollHeight;
      var scrollLeft = _state.scrollLeft;
      var scrollTop = _state.scrollTop;
      var scrollWidth = _state.scrollWidth;


      return children({
        clientHeight: clientHeight,
        clientWidth: clientWidth,
        onScroll: this._onScroll,
        scrollHeight: scrollHeight,
        scrollLeft: scrollLeft,
        scrollTop: scrollTop,
        scrollWidth: scrollWidth
      });
    }
  }, {
    key: 'shouldComponentUpdate',
    value: function shouldComponentUpdate(nextProps, nextState) {
      return (0, _reactAddonsShallowCompare2.default)(this, nextProps, nextState);
    }
  }, {
    key: '_onScroll',
    value: function _onScroll(_ref) {
      var clientHeight = _ref.clientHeight;
      var clientWidth = _ref.clientWidth;
      var scrollHeight = _ref.scrollHeight;
      var scrollLeft = _ref.scrollLeft;
      var scrollTop = _ref.scrollTop;
      var scrollWidth = _ref.scrollWidth;

      this.setState({ clientHeight: clientHeight, clientWidth: clientWidth, scrollHeight: scrollHeight, scrollLeft: scrollLeft, scrollTop: scrollTop, scrollWidth: scrollWidth });
    }
  }]);

  return ScrollSync;
}(_react.Component);

ScrollSync.propTypes = {
  /**
   * Function respondible for rendering 2 or more virtualized components.
   * This function should implement the following signature:
   * ({ onScroll, scrollLeft, scrollTop }) => PropTypes.element
   */
  children: _react.PropTypes.func.isRequired
};
exports.default = ScrollSync;