gitlab-org--gitlab-foss/app/assets/javascripts/layout_nav.js

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JavaScript
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import ContextualSidebar from './contextual_sidebar';
import initFlyOutNav from './fly_out_nav';
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function hideEndFade($scrollingTabs) {
$scrollingTabs.each(function scrollTabsLoop() {
const $this = $(this);
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$this.siblings('.fade-right').toggleClass('scrolling', Math.round($this.width()) < $this.prop('scrollWidth'));
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});
}
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export default function initLayoutNav() {
const contextualSidebar = new ContextualSidebar();
contextualSidebar.bindEvents();
initFlyOutNav();
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$(document).on('init.scrolling-tabs', () => {
const $scrollingTabs = $('.scrolling-tabs').not('.is-initialized');
$scrollingTabs.addClass('is-initialized');
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$(window).on('resize.nav', () => {
hideEndFade($scrollingTabs);
}).trigger('resize.nav');
$scrollingTabs.on('scroll', function tabsScrollEvent() {
const $this = $(this);
const currentPosition = $this.scrollLeft();
const maxPosition = $this.prop('scrollWidth') - $this.outerWidth();
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$this.siblings('.fade-left').toggleClass('scrolling', currentPosition > 0);
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$this.siblings('.fade-right').toggleClass('scrolling', currentPosition < maxPosition - 1);
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});
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$scrollingTabs.each(function scrollTabsEachLoop() {
const $this = $(this);
const scrollingTabWidth = $this.width();
const $active = $this.find('.active');
const activeWidth = $active.width();
if ($active.length) {
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const offset = $active.offset().left + activeWidth;
if (offset > scrollingTabWidth - 30) {
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const scrollLeft = (offset - (scrollingTabWidth / 2)) - (activeWidth / 2);
$this.scrollLeft(scrollLeft);
}
}
});
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}).trigger('init.scrolling-tabs');
}