Gitlab code review mouse shortcut

Add mouse shortcut to Gitlab code review (NOTE: only for settings: show one file at a time)

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(У мене вже є менеджер скриптів, дайте мені встановити його!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         Gitlab code review mouse shortcut
// @namespace    http://kenngsimply.com/
// @version      0.1
// @description  Add mouse shortcut to Gitlab code review (NOTE: only for settings: show one file at a time)
// @author       Ken Ng
// @match        https://gitlab.com/*/merge_requests*
// @grant        none
// @license      MIT
// ==/UserScript==

/* jshint esversion: 6 */

(function() {
    function eventFire(el, etype='click'){
        if (el.fireEvent) {
            el.fireEvent('on' + etype);
        } else {
            const evObj = document.createEvent('Events');
            evObj.initEvent(etype, true, false);
            el.dispatchEvent(evObj);
        }
    }

    function debounced(func, timeout = 300){
        let timer;
        return (...args) => {
            if (!timer) {
                func.apply(this, args);
            }
            clearTimeout(timer);
            timer = setTimeout(() => {
                timer = undefined;
            }, timeout);
        };
    }

    function showPrevOrNextFile(ev) {
        if(ev.altKey) {
            if(ev.wheelDelta < 0) {
                // mouse wheel rotate downwards
                const item = document.querySelector('.page-item .next-page-item')
                eventFire(item)
                return
            }

            // mouse wheel rotate upwards
            const item = document.querySelector('.page-item .prev-page-item')
            eventFire(item)
        }
    }

    document.addEventListener("wheel", debounced(showPrevOrNextFile));
})();