refun/native/on-layout.js

A collection of React Hook-enabled functions that compose harmoniously with each other. Similar to `recompose`, but:

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.onLayout = void 0;

var _react = require("react");

var _tsfn = require("tsfn");

var _utils = require("./utils");

var onLayout = function onLayout(onLayoutHandler, watchKeys) {
  return function (props) {
    var propsRef = (0, _react.useRef)(_tsfn.EMPTY_OBJECT);
    var useEffectFnRef = (0, _react.useRef)(_tsfn.NOOP);
    var watchValuesRef = (0, _react.useRef)(_tsfn.EMPTY_ARRAY);

    if (watchValuesRef.current === _tsfn.EMPTY_ARRAY || !(0, _utils.shallowEqualByKeys)(propsRef.current, props, watchKeys)) {
      watchValuesRef.current = watchKeys.map(function (k) {
        return props[k];
      });
    }

    propsRef.current = props;

    if (useEffectFnRef.current === _tsfn.NOOP) {
      useEffectFnRef.current = function () {
        return onLayoutHandler(propsRef.current);
      };
    }

    (0, _react.useLayoutEffect)(useEffectFnRef.current, watchValuesRef.current);
    return props;
  };
};

exports.onLayout = onLayout;
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