@itsjonq/controls/dist/es/hooks/useControls.js

A control panel to develop React UI

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

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 _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance"); }

function _iterableToArrayLimit(arr, i) { if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === "[object Arguments]")) { return; } var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

import { useRef, useEffect, useState } from 'react';
import { store, getFields, resetFields } from '../store';
import * as knobs from '../knobs';
/**
 * A special hook that "connects" the store with a rendered component.
 * The hook callback arguments provide knobs that allow for the user
 * to add fields to the store.
 */

export function useControls() {
  var _useState = useState(getFields()),
      _useState2 = _slicedToArray(_useState, 2),
      fields = _useState2[0],
      setFields = _useState2[1];

  var ref = useRef(false);
  useEffect(function () {
    var updateState = function () {
      return setFields(getFields());
    };
    /**
     * Forces an update during the initial render phase.
     * This is required after the initial connection to the store.
     * Otherwise, the added fields do not show on first render.
     */


    if (!ref.current) {
      ref.current = true;
      updateState();
    }
    /**
     * A subscription is established to the store to "connect" to store
     * state together with this hook state.
     */


    store.subscribe(updateState);
    return function () {
      /**
       * The default behaviour is to remove all fields within the store
       * the moment the component is unmounted from view.
       */
      resetFields();
      /**
       * The subscription is removed from the store on unmount.
       */

      store.unsubscribe(updateState);
    };
  }, [ref, setFields]);
  var attributes = mapStateToProps(fields);
  return _objectSpread({}, knobs, {
    fields: fields,
    attributes: attributes
  });
}
/**
 * Remaps the collection of fields into a Object of key/value pairs.
 * @param {Array<Object>} state The fields.
 * @returns {Object}
 */

function mapStateToProps(state) {
  return state.reduce(function (props, item) {
    var _objectSpread2;

    return _objectSpread({}, props, (_objectSpread2 = {}, _objectSpread2[item.prop] = item.value, _objectSpread2));
  }, {});
}