/* global wpcom, jetpackCarouselStrings, DocumentTouch */

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/* eslint-disable no-shadow */

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( function () {

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'use strict';

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var swiper;

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/////////////////////////////////////

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// Utility functions

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/////////////////////////////////////

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var util = ( function () {

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var noop = function () {};

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function texturize( text ) {

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// Ensure we get a string.

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text = text + '';

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text = text.replace( /'/g, '’' ).replace( /'/g, '’' );

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text = text

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.replace( /"/g, '”' )

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.replace( /"/g, '”' )

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.replace( /"/g, '”' )

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.replace( /[\u201D]/g, '”' );

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// Untexturize allowed HTML tags params double-quotes.

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text = text.replace( /([\w]+)=&#[\d]+;(.+?)&#[\d]+;/g, '$1="$2"' );

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return text.trim();

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}

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function applyReplacements( text, replacements ) {

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if ( ! text ) {

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return;

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}

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if ( ! replacements ) {

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return text;

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}

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return text.replace( /{(\d+)}/g, function ( match, number ) {

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return typeof replacements[ number ] !== 'undefined' ? replacements[ number ] : match;

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} );

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}

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function getBackgroundImage( imgEl ) {

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var canvas = document.createElement( 'canvas' ),

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context = canvas.getContext && canvas.getContext( '2d' );

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if ( ! imgEl ) {

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return;

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}

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context.filter = 'blur(20px) ';

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context.drawImage( imgEl, 0, 0 );

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var url = canvas.toDataURL( 'image/png' );

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canvas = null;

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return url;

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}

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return {

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noop: noop,

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texturize: texturize,

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applyReplacements: applyReplacements,

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getBackgroundImage: getBackgroundImage,

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};

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} )();

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/////////////////////////////////////

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// DOM-related utility functions

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/////////////////////////////////////

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var domUtil = ( function () {

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// Helper matches function (not a polyfill), compatible with IE 11.

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function matches( el, sel ) {

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if ( Element.prototype.matches ) {

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return el.matches( sel );

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}

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if ( Element.prototype.msMatchesSelector ) {

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return el.msMatchesSelector( sel );

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}

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}

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// Helper closest parent node function (not a polyfill) based on

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// https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill

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function closest( el, sel ) {

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if ( el.closest ) {

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return el.closest( sel );

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}

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var current = el;

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do {

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if ( matches( current, sel ) ) {

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return current;

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}

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current = current.parentElement || current.parentNode;

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} while ( current !== null && current.nodeType === 1 );

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return null;

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}

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function hide( el ) {

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if ( el ) {

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el.style.display = 'none';

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}

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}

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function show( el ) {

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if ( el ) {

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// Everything we show and hide in Carousel is currently a block,

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// so we can make this really straightforward.

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el.style.display = 'block';

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}

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}

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function fade( el, start, end, callback ) {

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if ( ! el ) {

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return callback();

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}

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// Prepare for transition.

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// Ensure the item is in the render tree, in its initial state.

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el.style.removeProperty( 'display' );

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el.style.opacity = start;

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el.style.pointerEvents = 'none';

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var animate = function ( t0, duration ) {

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var t = performance.now();

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var diff = t - t0;

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var ratio = diff / duration;

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if ( ratio < 1 ) {

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el.style.opacity = start + ( end - start ) * ratio;

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requestAnimationFrame( () => animate( t0, duration ) );

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} else {

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el.style.opacity = end;

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el.style.removeProperty( 'pointer-events' );

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callback();

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}

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};

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requestAnimationFrame( function () {

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// Double rAF for browser compatibility.

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requestAnimationFrame( function () {

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animate( performance.now(), 200 );

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} );

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} );

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}

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function fadeIn( el, callback ) {

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callback = callback || util.noop;

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fade( el, 0, 1, callback );

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}

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function fadeOut( el, callback ) {

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callback = callback || util.noop;

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fade( el, 1, 0, function () {

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if ( el ) {

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el.style.display = 'none';

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}

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callback();

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} );

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}

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function emitEvent( el, type, detail ) {

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var e;

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try {

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e = new CustomEvent( type, {

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bubbles: true,

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cancelable: true,

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detail: detail || null,

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} );

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} catch {

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e = document.createEvent( 'CustomEvent' );

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e.initCustomEvent( type, true, true, detail || null );

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}

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el.dispatchEvent( e );

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}

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// From: https://easings.net/#easeInOutQuad

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function easeInOutQuad( num ) {

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return num < 0.5 ? 2 * num * num : 1 - Math.pow( -2 * num + 2, 2 ) / 2;

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}

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function getFooterClearance( container ) {

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var footer = container.querySelector( '.jp-carousel-info-footer' );

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var infoArea = container.querySelector( '.jp-carousel-info-extra' );

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var contentArea = container.querySelector( '.jp-carousel-info-content-wrapper' );

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if ( footer && infoArea && contentArea ) {

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var styles = window.getComputedStyle( infoArea );

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var padding = parseInt( styles.paddingTop, 10 ) + parseInt( styles.paddingBottom, 10 );

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padding = isNaN( padding ) ? 0 : padding;

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return contentArea.offsetHeight + footer.offsetHeight + padding;

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}

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return 0;

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}

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function isTouch() {

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return (

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'ontouchstart' in window || ( window.DocumentTouch && document instanceof DocumentTouch )

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);

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}

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function scrollToElement( el, container, callback ) {

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if ( ! el || ! container ) {

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if ( callback ) {

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return callback();

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}

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return;

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}

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// For iOS Safari compatibility, use JS to set the minimum height.

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var infoArea = container.querySelector( '.jp-carousel-info-extra' );

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if ( infoArea ) {

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// 64px is the same height as `.jp-carousel-info-footer` in the CSS.

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infoArea.style.minHeight = window.innerHeight - 64 + 'px';

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}

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var isScrolling = true;

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var startTime = Date.now();

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var duration = 300;

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var originalPosition = container.scrollTop;

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var targetPosition = Math.max(

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0,

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el.offsetTop - Math.max( 0, window.innerHeight - getFooterClearance( container ) )

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);

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var distance = targetPosition - container.scrollTop;

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distance = Math.min( distance, container.scrollHeight - window.innerHeight );

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function stopScroll() {

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isScrolling = false;

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}

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function runScroll() {

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var now = Date.now();

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var progress = easeInOutQuad( ( now - startTime ) / duration );

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progress = progress > 1 ? 1 : progress;

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var newVal = progress * distance;

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container.scrollTop = originalPosition + newVal;

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if ( now <= startTime + duration && isScrolling ) {

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return requestAnimationFrame( runScroll );

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}

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if ( callback ) {

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callback();

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}

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if ( infoArea ) {

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infoArea.style.minHeight = '';

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}

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isScrolling = false;

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container.removeEventListener( 'wheel', stopScroll );

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}

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// Allow scroll to be cancelled by user interaction.

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container.addEventListener( 'wheel', stopScroll );

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runScroll();

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}

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function getJSONAttribute( el, attr ) {

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if ( ! el || ! el.hasAttribute( attr ) ) {

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return undefined;

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}

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try {

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return JSON.parse( el.getAttribute( attr ) );

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} catch {

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return undefined;

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}

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}

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function convertToPlainText( html ) {

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var dummy = document.createElement( 'div' );

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dummy.textContent = html;

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return dummy.innerHTML;

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}

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function stripHTML( text ) {

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return text.replace( /<[^>]*>?/gm, '' );

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}

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return {

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closest: closest,

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matches: matches,

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hide: hide,

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show: show,

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fadeIn: fadeIn,

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fadeOut: fadeOut,

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scrollToElement: scrollToElement,

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getJSONAttribute: getJSONAttribute,

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convertToPlainText: convertToPlainText,

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stripHTML: stripHTML,

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emitEvent: emitEvent,

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isTouch: isTouch,

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};

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} )();

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/////////////////////////////////////

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// Carousel implementation

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/////////////////////////////////////

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function init() {

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var commentInterval;

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var screenPadding;

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var originalOverflow;

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var originalHOverflow;

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var scrollPos;

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var lastKnownLocationHash = '';

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var isUserTyping = false;

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var gallerySelector =

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'div.gallery, div.tiled-gallery, ul.wp-block-gallery, ul.blocks-gallery-grid, ' +

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'figure.wp-block-gallery.has-nested-images, div.wp-block-jetpack-tiled-gallery, a.single-image-gallery';

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// Selector for items within a gallery or tiled gallery.

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var galleryItemSelector =

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'.gallery-item, .tiled-gallery-item, .blocks-gallery-item, ' + ' .tiled-gallery__item';

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// Selector for all items including single images.

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var itemSelector = galleryItemSelector + ', .wp-block-image';

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var carousel = {};

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var stat =

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typeof wpcom !== 'undefined' && wpcom.carousel && wpcom.carousel.stat

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? wpcom.carousel.stat

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: util.noop;

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var pageview =

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typeof wpcom !== 'undefined' && wpcom.carousel && wpcom.carousel.pageview

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? wpcom.carousel.pageview

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: util.noop;

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function handleKeyboardEvent( e ) {

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if ( ! isUserTyping ) {

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switch ( e.which ) {

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case 38: // up

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e.preventDefault();

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carousel.overlay.scrollTop -= 100;

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break;

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case 40: // down

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e.preventDefault();

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carousel.overlay.scrollTop += 100;

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break;

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case 39: // right

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e.preventDefault();

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swiper.slideNext();

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break;

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case 37: // left

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case 8: // backspace

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e.preventDefault();

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swiper.slidePrev();

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break;

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case 27: // escape

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e.preventDefault();

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closeCarousel();

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break;

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default:

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break;

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}

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}

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}

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function disableKeyboardNavigation() {

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isUserTyping = true;

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}

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function enableKeyboardNavigation() {

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isUserTyping = false;

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}

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function calculatePadding() {

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var baseScreenPadding = 110;

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screenPadding = baseScreenPadding;

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if ( window.innerWidth <= 760 ) {

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screenPadding = Math.round( ( window.innerWidth / 760 ) * baseScreenPadding );

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if ( screenPadding < 40 && domUtil.isTouch() ) {

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screenPadding = 0;

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}

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}

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}

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function makeGalleryImageAccessible( img ) {

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img.role = 'button';

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img.tabIndex = 0;

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img.ariaLabel = jetpackCarouselStrings.image_label;

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}

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function initializeCarousel() {

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if ( ! carousel.overlay ) {

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carousel.overlay = document.querySelector( '.jp-carousel-overlay' );

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carousel.container = carousel.overlay.querySelector( '.jp-carousel-wrap' );

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carousel.gallery = carousel.container.querySelector( '.jp-carousel' );

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carousel.info = carousel.overlay.querySelector( '.jp-carousel-info' );

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carousel.caption = carousel.info.querySelector( '.jp-carousel-caption' );

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carousel.commentField = carousel.overlay.querySelector(

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'#jp-carousel-comment-form-comment-field'

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);

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carousel.emailField = carousel.overlay.querySelector(

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'#jp-carousel-comment-form-email-field'

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);

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carousel.authorField = carousel.overlay.querySelector(

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'#jp-carousel-comment-form-author-field'

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);

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carousel.urlField = carousel.overlay.querySelector( '#jp-carousel-comment-form-url-field' );

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calculatePadding();

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[

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carousel.commentField,

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carousel.emailField,

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carousel.authorField,

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carousel.urlField,

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].forEach( function ( field ) {

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if ( field ) {

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field.addEventListener( 'focus', disableKeyboardNavigation );

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field.addEventListener( 'blur', enableKeyboardNavigation );

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}

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} );

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carousel.overlay.addEventListener( 'click', function ( e ) {

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var target = e.target;

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var isTargetCloseHint = !! domUtil.closest( target, '.jp-carousel-close-hint' );

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var isSmallScreen = !! window.matchMedia( '(max-device-width: 760px)' ).matches;

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if ( target === carousel.overlay ) {

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if ( ! isSmallScreen ) {

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closeCarousel();

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}

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} else if ( isTargetCloseHint ) {

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closeCarousel();

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} else if ( target.classList.contains( 'jp-carousel-image-download' ) ) {

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stat( 'download_original_click' );

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} else if ( target.classList.contains( 'jp-carousel-comment-login' ) ) {

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handleCommentLoginClick( e );

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} else if ( domUtil.closest( target, '#jp-carousel-comment-form-container' ) ) {

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handleCommentFormClick( e );

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} else if (

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domUtil.closest( target, '.jp-carousel-photo-icons-container' ) ||

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target.classList.contains( 'jp-carousel-photo-title' )

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) {

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handleFooterElementClick( e );

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}

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} );

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window.addEventListener( 'keydown', handleKeyboardEvent );

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[443] Fix | Delete

carousel.overlay.addEventListener( 'jp_carousel.afterOpen', function () {

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enableKeyboardNavigation();

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// Don't show navigation if there's only one image.

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if ( carousel.slides.length <= 1 ) {

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return;

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}

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// Show dot pagination if slide count is <= 5, otherwise show n/total.

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if ( carousel.slides.length <= 5 ) {

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domUtil.show( carousel.info.querySelector( '.jp-swiper-pagination' ) );

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} else {

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domUtil.show( carousel.info.querySelector( '.jp-carousel-pagination' ) );

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}

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} );

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carousel.overlay.addEventListener( 'jp_carousel.beforeClose', function () {

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disableKeyboardNavigation();

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// Fixes some themes where closing carousel brings view back to top.

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document.documentElement.style.removeProperty( 'height' );

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// If we disable the swiper (because there's only one image)

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// we have to re-enable it here again as Swiper doesn't, for some reason,

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// show the navigation buttons again after reinitialization.

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if ( swiper ) {

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swiper.enable();

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}

[470] Fix | Delete

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// Hide pagination.

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domUtil.hide( carousel.info.querySelector( '.jp-swiper-pagination' ) );

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domUtil.hide( carousel.info.querySelector( '.jp-carousel-pagination' ) );

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} );

[475] Fix | Delete

[476] Fix | Delete

carousel.overlay.addEventListener( 'jp_carousel.afterClose', function () {

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// don't force the browser back when the carousel closes.

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if ( window.history.pushState ) {

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history.pushState(

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'',

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document.title,

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window.location.pathname + window.location.search

[483] Fix | Delete

);

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} else {

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window.location.href = '';

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}

[487] Fix | Delete

lastKnownLocationHash = '';

[488] Fix | Delete

carousel.isOpen = false;

[489] Fix | Delete

} );

[490] Fix | Delete

[491] Fix | Delete

// Prevent native browser zooming

[492] Fix | Delete

carousel.overlay.addEventListener( 'touchstart', function ( e ) {

[493] Fix | Delete

if ( e.touches.length > 1 ) {

[494] Fix | Delete

e.preventDefault();

[495] Fix | Delete

}

[496] Fix | Delete

} );

[497] Fix | Delete

}

[498] Fix | Delete

}

[499] Fix | Delete