radium/lib/style-keeper.js

'use strict';

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

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var StyleKeeper = function () {
  function StyleKeeper(userAgent) {
    _classCallCheck(this, StyleKeeper);

    this._userAgent = userAgent;
    this._listeners = [];
    this._cssSet = {};
  }

  StyleKeeper.prototype.subscribe = function subscribe(listener) {
    var _this = this;

    if (this._listeners.indexOf(listener) === -1) {
      this._listeners.push(listener);
    }

    return {
      // Must be fat arrow to capture `this`
      remove: function remove() {
        var listenerIndex = _this._listeners.indexOf(listener);
        if (listenerIndex > -1) {
          _this._listeners.splice(listenerIndex, 1);
        }
      }
    };
  };

  StyleKeeper.prototype.addCSS = function addCSS(css) {
    var _this2 = this;

    if (!this._cssSet[css]) {
      this._cssSet[css] = true;
      this._emitChange();
    }

    return {
      // Must be fat arrow to capture `this`
      remove: function remove() {
        delete _this2._cssSet[css];
        _this2._emitChange();
      }
    };
  };

  StyleKeeper.prototype.getCSS = function getCSS() {
    return Object.keys(this._cssSet).join('\n');
  };

  StyleKeeper.prototype._emitChange = function _emitChange() {
    this._listeners.forEach(function (listener) {
      return listener();
    });
  };

  return StyleKeeper;
}();

exports.default = StyleKeeper;
module.exports = exports['default'];