https://www.store.rubbettinoeditore.it/wp-content/plugins/twentig/…/js/classic/twentig-twentytwenty.js?ver=1.0

1(function() {
2
3	/**
4	 * hasClass utility
5	 */
6	function hasClass(el, cls) {
7		if ( el.classList.contains( cls ) ) {
8			return true;
9		}
10		return false;
11	}
12
13	/**
14	 * Throttle function
15	 * Underscore.js 1.10.2 https://underscorejs.org
16	 * (c) 2009-2020 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
17	 * Underscore may be freely distributed under the MIT license.
18	 */
19	function throttle(func, wait, options) {
20		var now = Date.now || function() {
21			return new Date().getTime();
22		};
23		var timeout, context, args, result;
24		var previous = 0;
25		if (!options) options = {};
26		var later = function() {
27			previous = options.leading === false ? 0 : now();
28			timeout = null;
29			result = func.apply(context, args);
30			if (!timeout) context = args = null;
31		};
32		var throttled = function() {
33			var _now = now();
34			if (!previous && options.leading === false) previous = _now;
35			var remaining = wait - (_now - previous);
36			context = this;
37			args = arguments;
38			if (remaining <= 0 || remaining > wait) {
39				if (timeout) {
40					clearTimeout(timeout);
41					timeout = null;
42				}
43				previous = _now;
44				result = func.apply(context, args);
45				if (!timeout) context = args = null;
46			} else if (!timeout && options.trailing !== false) {
47				timeout = setTimeout(later, remaining);
48			}
49			return result;
50		};
51		return throttled;
52	}
53
54	/**
55	 * Runs the burger menu and sticky header functions as soon as the document is `ready`
56	 */
57	document.addEventListener( 'DOMContentLoaded', function() {
58
59		var modals = document.querySelectorAll( '.cover-modal' );
60		modals.forEach( function( modal ) {
61			modal.addEventListener( 'toggle-target-before-inactive', function( event ) {
62				document.body.classList.add( 'tw-os-modal-fix' );
63				document.documentElement.style.setProperty('scroll-behavior', 'auto' );
64			});
65			modal.addEventListener( 'toggle-target-after-inactive', function( event ) {
66				setTimeout( function() {
67					document.body.classList.remove( 'tw-os-modal-fix' );
68					document.documentElement.style.removeProperty( 'scroll-behavior' );
69				}, 550 );
70			});
71		} );
72
73		var header = document.querySelector( '#site-header' );
74		if ( header != null && hasClass( document.body, 'tw-header-sticky' ) ) {
75			var scrollToElement = document.querySelector( '.to-the-top' );
76			if ( scrollToElement ) {
77				scrollToElement.addEventListener( 'click', function( event ) {
78					event.preventDefault();
79					document.documentElement.scrollTop = 0;
80					document.body.scrollTop = 0;
81				});
82			}
83
84			if ( 'fixed' !== getComputedStyle( header ).position ) {
85				modals.forEach( function( modal ) {
86					modal.addEventListener( 'toggle-target-before-inactive', function( event ) {
87						header.style.setProperty( 'position', 'fixed' );
88						document.body.style.setProperty( 'padding-top', header.getBoundingClientRect().height + 'px' );
89					});
90					modal.addEventListener( 'toggle-target-after-inactive', function( event ) {
91						setTimeout( function() {
92							header.style.removeProperty( 'position' );
93							document.body.style.removeProperty( 'padding-top' );
94						}, 550 );
95					});
96				} );
97			}
98
99			if ( hasClass( document.body, 'overlay-header' ) || hasClass( document.body, 'tw-header-transparent' ) ) {
100				var modals = document.querySelectorAll( '.cover-modal' );
101				modals.forEach( function( modal ) {
102					modal.addEventListener( 'toggle-target-before-inactive', function( event ) {
103						document.body.classList.add( 'tw-modal-active' );
104					});					
105					modal.addEventListener( 'toggle-target-after-inactive', function( event ) {
106						document.body.classList.remove( 'tw-modal-active' );
107					});
108				} );
109
110				var scrollTop = window.pageYOffset;
111				if ( scrollTop > 30 ) {
112					document.body.classList.add( 'has-header-opaque' );
113				} 
114
115				window.addEventListener( 'scroll', throttle( function() {
116					var scrollTop = window.pageYOffset;
117					if ( scrollTop > 30 ) {
118						document.body.classList.add( 'has-header-opaque' );
119					} else if ( ! hasClass( document.body, 'tw-modal-active' ) ) {
120						document.body.classList.remove( 'has-header-opaque' );
121					}
122				}, 100 ) );
123			}
124		}
125	});
126})();