web/assets/js/ace/ace.sidebar-scroll-2.js

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/**
 <b>Scrollbars for sidebar</b>. This approach can be used on fixed or normal sidebar.
 It uses <u>"overflow:hidden"</u> so you can't use <u>.hover</u> submenus and it will be disabled when sidebar is minimized.
 It may also be marginally (negligibily) faster especially when resizing browser window.
 Needs some work! Has a few issues!
*/

ace.sidebar_scrollable = function($ , options) {
	if( !$.fn.ace_scroll ) return;

	var old_safari = ace.vars['safari'] && navigator.userAgent.match(/version\/[1-5]/i)
	//NOTE
	//Safari on windows has not been updated for a long time.
	//And it has a problem when sidebar is fixed&scrollable and there is a CSS3 animation inside page content.
	//Very probably windows users of safari have migrated to another browser by now!


	var $sidebar = $('.sidebar'),
		$navbar = $('.navbar'),
		$nav = $sidebar.find('.nav-list'),
		$toggle = $sidebar.find('.sidebar-toggle'),
		$shortcuts = $sidebar.find('.sidebar-shortcuts'),
		$window = $(window),

		sidebar = $sidebar.get(0),
		nav = $nav.get(0);

		if(!sidebar || !nav) return;

	var submenu_hover = function() {
		return sidebar.first('li.hover > .submenu').css('position') == 'absolute'
	}

	
	var scroll_div = null,
		scroll_content = null,
		scroll_content_div = null,
		bar = null,
		ace_scroll = null;

	var is_scrolling = false,
		_initiated = false;
		
	var scroll_to_active = options.scroll_to_active || false,
		include_shortcuts = options.include_shortcuts || false,
		include_toggle = options.include_toggle || false,
		only_if_fixed = options.only_if_fixed && true;
		
	var is_sidebar_fixed =
	'getComputedStyle' in window ?
	//sidebar.offsetHeight is used to force redraw and recalculate 'sidebar.style.position' esp for webkit!
	function() { sidebar.offsetHeight; return window.getComputedStyle(sidebar).position == 'fixed' }
	:
	function() { sidebar.offsetHeight; return $sidebar.css('position') == 'fixed' }
	//sometimes when navbar is fixed, sidebar automatically becomes fixed without needing ".sidebar-fixed" class
	//currently when mobile_style == 1

	var $avail_height, $content_height;
	var sidebar_fixed = is_sidebar_fixed(),
		horizontal = $sidebar.hasClass('h-sidebar');