react-sync-state/lib/Component.js

A client side implementation for synchronizing states with server

'use strict';

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; }; })();

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

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _Entity = require('./_Entity');

var _Entity2 = _interopRequireDefault(_Entity);

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; }

/**
 * A React Component that maintains its state to reflect the changes made
 * to the Entity (Record and RecordSet) objects.
 */

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

  function Component(props) {
    _classCallCheck(this, Component);

    // This Component is linked only if it has a state property and
    // that it is of an Entity type (Record or RecordSet)

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

    if (props.state && props.state instanceof _Entity2.default) {
      _this.linked = true;
      _this.state = props.state;
    } else {
      _this.state = {};
    }
    return _this;
  }

  // Listen to the subscription event only when the Component is
  // made visible, otherwise no need to pollute the State

  _createClass(Component, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      // let's see if the component has a 'state' property and it
      // is an entity, in which case, we will listen on that entity
      if (this.linked) {
        this.props.state.subscribe(this);
      }
    }

    // Gracefully unsubscribe to the state events, to avoid any
    // memory leak and unwanted pollution of State

  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      if (this.linked) {
        this.props.state.unsubscribe(this);
      }
    }

    // Callback event, need to rerender

  }, {
    key: 'onStateChanged',
    value: function onStateChanged(entity) {
      console.log("State Changed - ", entity);
      // just make sure that this is the same as the props.state
      if (entity != this.props.state) {
        console.error("We got a state mismatch somewhere. " + "The component was initialized with state property", this.props.state, "But now its receiving events from another entity", entity);
      } else {
        this.setState(entity);
      }
    }
  }]);

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

exports.default = Component;