szurubooru/public_html/js/Presenters/ProgressPresenter.js

var App = App || {};
App.Controls = App.Controls || {};

App.Presenters.ProgressPresenter = function(nprogress) {
    var nesting = 0;

    function start() {
        nesting ++;

        if (nesting === 1) {
            nprogress.start();
        }
    }

    function reset() {
        nesting = 0;
    }

    function done() {
        if (nesting) {
            nesting --;
        }

        if (nesting <= 0) {
            nprogress.done();
        } else {
            nprogress.inc();
        }
    }

    window.setInterval(function() {
        if (nesting <= 0) {
            nprogress.done();
        }
    }, 1000);

    return {
        start: start,
        done: done,
        reset: reset,
    };

};

App.DI.registerSingleton('progress', ['nprogress'], App.Presenters.ProgressPresenter);