@wordpress/compose/build/hooks/use-ref-effect/index.js

WordPress higher-order components (HOCs).

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = useRefEffect;
var _element = require("@wordpress/element");
/**
 * External dependencies
 */

/**
 * WordPress dependencies
 */

/**
 * Effect-like ref callback. Just like with `useEffect`, this allows you to
 * return a cleanup function to be run if the ref changes or one of the
 * dependencies changes. The ref is provided as an argument to the callback
 * functions. The main difference between this and `useEffect` is that
 * the `useEffect` callback is not called when the ref changes, but this is.
 * Pass the returned ref callback as the component's ref and merge multiple refs
 * with `useMergeRefs`.
 *
 * It's worth noting that if the dependencies array is empty, there's not
 * strictly a need to clean up event handlers for example, because the node is
 * to be removed. It *is* necessary if you add dependencies because the ref
 * callback will be called multiple times for the same node.
 *
 * @param callback     Callback with ref as argument.
 * @param dependencies Dependencies of the callback.
 *
 * @return Ref callback.
 */
function useRefEffect(callback, dependencies) {
  const cleanupRef = (0, _element.useRef)();
  return (0, _element.useCallback)(node => {
    if (node) {
      cleanupRef.current = callback(node);
    } else if (cleanupRef.current) {
      cleanupRef.current();
    }
  }, dependencies);
}
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