react-film/lib/hooks/internal/useCallbackRefWithSubscribe.js

React component for showing carousel just like a film strip

"use strict";

require("core-js/modules/es.object.define-property.js");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = useCallbackRefWithSubscribe;

require("core-js/modules/es.array.for-each.js");

require("core-js/modules/es.array.index-of.js");

require("core-js/modules/es.array.splice.js");

var _react = require("react");

var SUBSCRIBER_LIMIT = 10;

function useCallbackRefWithSubscribe() {
  return (0, _react.useMemo)(function () {
    var subscriptions = [];

    var callbackRef = function callbackRef(current) {
      callbackRef.current = current;
      subscriptions.forEach(function (subscription) {
        subscription.cleanup && subscription.cleanup();
        subscription.cleanup = subscription.callback(current);
      });
    };

    callbackRef.subscribe = function (callback) {
      var subscription = {
        callback: callback
      };
      subscriptions.push(subscription);

      if (subscriptions.length >= SUBSCRIBER_LIMIT) {
        console.warn("useSubscribe: Reaching maximum limit of subscribers (".concat(SUBSCRIBER_LIMIT, "), please make sure your code did clean up properly."));
      }

      subscription.cleanup = callback(callbackRef.current);
      return function () {
        subscription.cleanup && subscription.cleanup();
        var index = subscriptions.indexOf(subscription);
        ~index && subscriptions.splice(index, 1);
      };
    };

    return callbackRef;
  }, []);
}
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