carbon-components/umd/globals/js/misc/resize.js

Carbon Components is a component library for IBM Cloud

(function (global, factory) {
  if (typeof define === "function" && define.amd) {
    define(['exports'], factory);
  } else if (typeof exports !== "undefined") {
    factory(exports);
  } else {
    var mod = {
      exports: {}
    };
    factory(mod.exports);
    global.resize = mod.exports;
  }
})(this, function (exports) {
  'use strict';

  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  // mdn resize function

  var optimizedResize = function optimizedResize() {
    var callbacks = [];
    var running = false;

    // run the actual callbacks
    function runCallbacks() {
      callbacks.forEach(function (callback) {
        callback();
      });

      running = false;
    }

    // fired on resize event
    function resize() {
      if (!running) {
        running = true;
        window.requestAnimationFrame(runCallbacks);
      }
    }

    // adds callback to loop
    function addCallback(callback) {
      if (callback) {
        var index = callbacks.indexOf(callback);
        if (index < 0) {
          callbacks.push(callback);
        }
      }
    }

    return {
      // public method to add additional callback
      add: function add(callback) {
        if (!callbacks.length) {
          window.addEventListener('resize', resize);
        }
        addCallback(callback);
        return {
          release: function release() {
            var index = callbacks.indexOf(callback);
            if (index >= 0) {
              callbacks.splice(index, 1);
            }
          }
        };
      }
    };
  }();

  exports.default = optimizedResize;
});