@enact/ui/useControlledState/useControlledState.js

A collection of simplified unstyled cross-platform UI components for Enact

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
exports.useControlledState = useControlledState;
var _react = require("react");
function _slicedToArray(r, e) { return _arrayWithHoles(r) || _iterableToArrayLimit(r, e) || _unsupportedIterableToArray(r, e) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(r, a) { if (r) { if ("string" == typeof r) return _arrayLikeToArray(r, a); var t = {}.toString.call(r).slice(8, -1); return "Object" === t && r.constructor && (t = r.constructor.name), "Map" === t || "Set" === t ? Array.from(r) : "Arguments" === t || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(t) ? _arrayLikeToArray(r, a) : void 0; } }
function _arrayLikeToArray(r, a) { (null == a || a > r.length) && (a = r.length); for (var e = 0, n = Array(a); e < a; e++) n[e] = r[e]; return n; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(r) { if (Array.isArray(r)) return r; }
function nop() {}

// Generate a handler that hides the controlled value from users, supports functional callbacks,
// and is memoized by the onChange provided by useState
function createHandler() {
  return function (onChange, currentValue, controlled) {
    if (controlled) {
      return nop;
    }
    return function (value) {
      if (value !== currentValue) {
        onChange(value);
      }
    };
  };
}

// always return the prop value when controlled and the state value when not
function calcValue(defaultValue, propValue, stateValue, controlled) {
  if (!controlled) {
    return stateValue;
  }

  // eslint-disable-next-line no-undefined
  return propValue !== undefined ? propValue : defaultValue;
}
function useControlledState(defaultValue, propValue, controlled) {
  var isControlled = (0, _react.useRef)(controlled);

  // Store both the value and the "controlled" flag in a state hook
  var _useState = (0, _react.useState)(defaultValue),
    _useState2 = _slicedToArray(_useState, 2),
    value = _useState2[0],
    onChange = _useState2[1];
  var memoOnChange = (0, _react.useMemo)(createHandler, [onChange, value, isControlled.current]);
  return [calcValue(defaultValue, propValue, value, isControlled.current), memoOnChange(onChange, value, isControlled.current)];
}
var _default = exports["default"] = useControlledState;