react-sticky/lib/Container.js

Sticky component for React

"use strict";

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

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; };

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);

var _propTypes = require("prop-types");

var _propTypes2 = _interopRequireDefault(_propTypes);

var _raf = require("raf");

var _raf2 = _interopRequireDefault(_raf);

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; }

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

  function Container() {
    var _ref;

    var _temp, _this, _ret;

    _classCallCheck(this, Container);

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

    return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = Container.__proto__ || Object.getPrototypeOf(Container)).call.apply(_ref, [this].concat(args))), _this), _this.events = ["resize", "scroll", "touchstart", "touchmove", "touchend", "pageshow", "load"], _this.subscribers = [], _this.rafHandle = null, _this.subscribe = function (handler) {
      _this.subscribers = _this.subscribers.concat(handler);
    }, _this.unsubscribe = function (handler) {
      _this.subscribers = _this.subscribers.filter(function (current) {
        return current !== handler;
      });
    }, _this.notifySubscribers = function (evt) {
      if (!_this.framePending) {
        var currentTarget = evt.currentTarget;


        _this.rafHandle = (0, _raf2.default)(function () {
          _this.framePending = false;

          var _this$node$getBoundin = _this.node.getBoundingClientRect(),
              top = _this$node$getBoundin.top,
              bottom = _this$node$getBoundin.bottom;

          _this.subscribers.forEach(function (handler) {
            return handler({
              distanceFromTop: top,
              distanceFromBottom: bottom,
              eventSource: currentTarget === window ? document.body : _this.node
            });
          });
        });
        _this.framePending = true;
      }
    }, _this.getParent = function () {
      return _this.node;
    }, _temp), _possibleConstructorReturn(_this, _ret);
  }

  _createClass(Container, [{
    key: "getChildContext",
    value: function getChildContext() {
      return {
        subscribe: this.subscribe,
        unsubscribe: this.unsubscribe,
        getParent: this.getParent
      };
    }
  }, {
    key: "componentDidMount",
    value: function componentDidMount() {
      var _this2 = this;

      this.events.forEach(function (event) {
        return window.addEventListener(event, _this2.notifySubscribers);
      });
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      var _this3 = this;

      if (this.rafHandle) {
        _raf2.default.cancel(this.rafHandle);
        this.rafHandle = null;
      }

      this.events.forEach(function (event) {
        return window.removeEventListener(event, _this3.notifySubscribers);
      });
    }
  }, {
    key: "render",
    value: function render() {
      var _this4 = this;

      return _react2.default.createElement("div", _extends({}, this.props, {
        ref: function ref(node) {
          return _this4.node = node;
        },
        onScroll: this.notifySubscribers,
        onTouchStart: this.notifySubscribers,
        onTouchMove: this.notifySubscribers,
        onTouchEnd: this.notifySubscribers
      }));
    }
  }]);

  return Container;
}(_react.PureComponent);

Container.childContextTypes = {
  subscribe: _propTypes2.default.func,
  unsubscribe: _propTypes2.default.func,
  getParent: _propTypes2.default.func
};
exports.default = Container;