rxact-react/es/createObserver.js

React bindings for Rxact

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 _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 hoistStatics from 'hoist-non-react-statics';
import React, { Component } from 'react';
import { getObservable, isObservable } from 'rxact';

import noop from './utils/noop';
import isFunction from './utils/isFunction';

var setDisplayName = function setDisplayName(component) {
  var displayName = component.displayName || component.name || 'Component';

  return 'RxactObserver(' + displayName + ')';
};

var defaultMergeProps = function defaultMergeProps(state, props) {
  return _extends({}, props, state);
};

var createObserver = function createObserver(state$) {
  var Observable = getObservable();

  if (!isObservable(state$)) {
    throw new Error('Expect state$ to be instance of Observable');
  }

  var decorator = function decorator(mapStateToProps) {
    var mergeProps = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : defaultMergeProps;
    return function (WrappedComponent) {
      var Observer = function (_Component) {
        _inherits(Observer, _Component);

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

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

          _this.subscription = null;
          _this.streamSubscription = null;
          _this.propSubscription = null;
          _this.setProps = noop;
          _this.props$ = noop;
          _this.state = {
            component: null
          };
          _this.component = null;

          _this.initialSubscriptions = function () {
            var stream$ = state$;

            var vdom$ = new Observable(function (observer) {
              var readyCount = 0;
              var streamState = void 0;
              var propState = void 0;
              var onSubscribe = function onSubscribe() {
                if (readyCount < 2) {
                  readyCount += 1;
                }

                if (readyCount > 1) {
                  var nextState = streamState;

                  if (typeof mapStateToProps === 'function') {
                    nextState = mapStateToProps(streamState, propState);
                  }

                  var componentProps = mergeProps(nextState, propState);

                  var nextVdom = React.createElement(WrappedComponent, componentProps);
                  observer.next(nextVdom);
                }
              };

              _this.propSubscription = _this.props$.subscribe(function (state) {
                propState = state;
                onSubscribe();
              });
              _this.streamSubscription = stream$.subscribe(function (state) {

                streamState = state;
                onSubscribe();
              });

              return {
                unsubscribe: function unsubscribe() {}
              };
            });

            _this.subscription = vdom$.subscribe(function (component) {
              _this.component = component;

              if (_this.subscription) {
                _this.forceUpdate();
              }
            });
          };

          _this.props$ = new Observable(function (observer) {
            _this.setProps = function (props) {
              return observer.next(props);
            };

            _this.setProps(_this.props);

            return {
              unsubscribe: function unsubscribe() {
                _this.setProps = noop;
              }
            };
          });

          _this.initialSubscriptions();
          return _this;
        }

        _createClass(Observer, [{
          key: 'componentWillUnmount',
          value: function componentWillUnmount() {
            if (this.subscription) {
              this.subscription = null;
            }

            var streamSub = this.streamSubscription;
            if (streamSub && isFunction(streamSub.unsubscribe)) {
              streamSub.unsubscribe();
            }

            var propSub = this.propSubscription;
            if (propSub && isFunction(propSub.unsubscribe)) {
              propSub.unsubscribe();
            }
          }
        }, {
          key: 'componentWillReceiveProps',
          value: function componentWillReceiveProps(nextProps) {
            this.setProps(nextProps);
          }
        }, {
          key: 'shouldComponentUpdate',
          value: function shouldComponentUpdate() {
            return false;
          }
        }, {
          key: 'render',
          value: function render() {
            return this.component;
          }
        }]);

        return Observer;
      }(Component);

      Observer.displayName = setDisplayName(WrappedComponent);


      return hoistStatics(Observer, WrappedComponent);
    };
  };

  return {
    decorator: decorator
  };
};

export default createObserver;