styled-components/lib/models/ThemeProvider.js

Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress 💅

'use strict';

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

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 _isFunction = require('lodash/isFunction');

var _isFunction2 = _interopRequireDefault(_isFunction);

var _isPlainObject = require('lodash/isPlainObject');

var _isPlainObject2 = _interopRequireDefault(_isPlainObject);

var _createBroadcast = require('../utils/create-broadcast');

var _createBroadcast2 = _interopRequireDefault(_createBroadcast);

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

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return 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; }

// NOTE: DO NOT CHANGE, changing this is a semver major change!
var CHANNEL = exports.CHANNEL = '__styled-components__';

/**
 * Provide a theme to an entire react component tree via context and event listeners (have to do
 * both context and event emitter as pure components block context updates)
 */

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

  function ThemeProvider() {
    _classCallCheck(this, ThemeProvider);

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

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

  _createClass(ThemeProvider, [{
    key: 'componentWillMount',
    value: function componentWillMount() {
      var _this2 = this;

      // If there is a ThemeProvider wrapper anywhere around this theme provider, merge this theme
      // with the outer theme
      if (this.context[CHANNEL]) {
        var subscribe = this.context[CHANNEL];
        this.unsubscribeToOuter = subscribe(function (theme) {
          _this2.outerTheme = theme;
        });
      }
      this.broadcast = (0, _createBroadcast2.default)(this.getTheme());
    }
  }, {
    key: 'getChildContext',
    value: function getChildContext() {
      return Object.assign({}, this.context, _defineProperty({}, CHANNEL, this.broadcast.subscribe));
    }
  }, {
    key: 'componentWillReceiveProps',
    value: function componentWillReceiveProps(nextProps) {
      if (this.props.theme !== nextProps.theme) this.broadcast.publish(this.getTheme(nextProps.theme));
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      if (this.context[CHANNEL]) {
        this.unsubscribeToOuter();
      }
    }

    // Get the theme from the props, supporting both (outerTheme) => {} as well as object notation

  }, {
    key: 'getTheme',
    value: function getTheme(passedTheme) {
      var theme = passedTheme || this.props.theme;
      if ((0, _isFunction2.default)(theme)) {
        var mergedTheme = theme(this.outerTheme);
        if (!(0, _isPlainObject2.default)(mergedTheme)) {
          throw new Error('[ThemeProvider] Please return an object from your theme function, i.e. theme={() => ({})}!');
        }
        return mergedTheme;
      }
      if (!(0, _isPlainObject2.default)(theme)) {
        throw new Error('[ThemeProvider] Please make your theme prop a plain object');
      }
      return Object.assign({}, this.outerTheme, theme);
    }
  }, {
    key: 'render',
    value: function render() {
      if (!this.props.children) {
        return null;
      }
      return _react2.default.Children.only(this.props.children);
    }
  }]);

  return ThemeProvider;
}(_react.Component);

ThemeProvider.propTypes = {
  children: _react.PropTypes.node,
  theme: _react.PropTypes.oneOfType([_react.PropTypes.func, _react.PropTypes.object])
};
ThemeProvider.childContextTypes = _defineProperty({}, CHANNEL, _react.PropTypes.func.isRequired);
ThemeProvider.contextTypes = _defineProperty({}, CHANNEL, _react.PropTypes.func);

exports.default = ThemeProvider;