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✏️ Editing: tobii.cjs.js

'use strict';

/**
 * Tobii
 *
 * @author rqrauhvmra
 * @version 2.0.0-alpha
 * @url https://github.com/rqrauhvmra/Tobii
 *
 * MIT License
 */
function Tobii(userOptions) {
  /**
   * Global variables
   *
   */
  var config = {};
  var browserWindow = window;
  var figcaptionId = 0;
  var lightbox = null;
  var prevButton = null;
  var nextButton = null;
  var closeButton = null;
  var counter = null;
  var drag = {};
  var isDraggingX = false;
  var isDraggingY = false;
  var pointerDown = false;
  var lastFocus = null;
  var firstFocusableEl = null;
  var lastFocusableEl = null;
  var offset = null;
  var offsetTmp = null;
  var resizeTicking = false;
  var isYouTubeDependencieLoaded = false;
  var waitingEls = [];
  var player = [];
  var playerId = 0;
  var groupAtts = {
    gallery: [],
    slider: null,
    sliderElements: [],
    elementsLength: 0,
    currentIndex: 0,
    x: 0
  };
  var groups = {};
  var newGroup = null;
  var activeGroup = null;
  /**
   * Merge default options with user options
   *
   * @param {Object} userOptions - Optional user options
   * @returns {Object} - Custom options
   */

var mergeOptions = function mergeOptions(userOptions) {
    // Default options
    var options = {
      selector: '.lightbox',
      captions: true,
      captionsSelector: 'img',
      captionAttribute: 'alt',
      nav: 'auto',
      navText: ['<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M14 18l-6-6 6-6"/></svg>', '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M10 6l6 6-6 6"/></svg>'],
      navLabel: ['Previous image', 'Next image'],
      close: true,
      closeText: '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewbox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M6 6l12 12M6 18L18 6"/></svg>',
      closeLabel: 'Close lightbox',
      loadingIndicatorLabel: 'Image loading',
      counter: true,
      download: false,
      // TODO
      downloadText: '',
      // TODO
      downloadLabel: 'Download image',
      // TODO
      keyboard: true,
      zoom: true,
      zoomText: '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M21 16v5h-5"/><path d="M8 21H3v-5"/><path d="M16 3h5v5"/><path d="M3 8V3h5"/></svg>',
      docClose: true,
      swipeClose: true,
      hideScrollbar: true,
      draggable: true,
      threshold: 100,
      rtl: false,
      // TODO
      loop: false,
      // TODO
      autoplayVideo: false
    };

if (userOptions) {
      Object.keys(userOptions).forEach(function (key) {
        options[key] = userOptions[key];
      });
    }

return options;
  };
  /**
   * Types - you can add new type to support something new
   *
   */

var supportedElements = {
    image: {
      checkSupport: function checkSupport(el) {
        return !el.hasAttribute('data-type') && el.href.match(/\.(png|jpe?g|tiff|tif|gif|bmp|webp|svg|ico)(\?.*)?$/i);
      },
      init: function init(el, container) {
        var figure = document.createElement('figure');
        var figcaption = document.createElement('figcaption');
        var image = document.createElement('img');
        var thumbnail = el.querySelector('img');
        var loadingIndicator = document.createElement('div'); // Hide figure until the image is loaded

figure.style.opacity = '0';

if (thumbnail) {
          image.alt = thumbnail.alt || '';
        }

image.setAttribute('src', '');
        image.setAttribute('data-src', el.href); // Add image to figure

figure.appendChild(image); // Create figcaption

if (config.captions) {
          if (config.captionsSelector === 'self' && el.getAttribute(config.captionAttribute)) {
            figcaption.textContent = el.getAttribute(config.captionAttribute);
          } else if (config.captionsSelector === 'img' && thumbnail && thumbnail.getAttribute(config.captionAttribute)) {
            figcaption.textContent = thumbnail.getAttribute(config.captionAttribute);
          }

if (figcaption.textContent) {
            figcaption.id = "tobii-figcaption-" + figcaptionId;
            figure.appendChild(figcaption);
            image.setAttribute('aria-labelledby', figcaption.id);
            ++figcaptionId;
          }
        } // Add figure to container

container.appendChild(figure); // Create loading indicator

loadingIndicator.className = 'tobii-loader';
        loadingIndicator.setAttribute('role', 'progressbar');
        loadingIndicator.setAttribute('aria-label', config.loadingIndicatorLabel); // Add loading indicator to container

container.appendChild(loadingIndicator); // Register type

container.setAttribute('data-type', 'image');
      },
      onPreload: function onPreload(container) {
        // Same as preload
        supportedElements.image.onLoad(container);
      },
      onLoad: function onLoad(container) {
        var image = container.querySelector('img');

if (!image.hasAttribute('data-src')) {
          return;
        }

var figure = container.querySelector('figure');
        var loadingIndicator = container.querySelector('.tobii-loader');

image.onload = function () {
          container.removeChild(loadingIndicator);
          figure.style.opacity = '1';
        };

image.setAttribute('src', image.getAttribute('data-src'));
        image.removeAttribute('data-src');
      },
      onLeave: function onLeave(container) {// Nothing
      },
      onCleanup: function onCleanup(container) {// Nothing
      }
    },
    html: {
      checkSupport: function checkSupport(el) {
        return checkType(el, 'html');
      },
      init: function init(el, container) {
        var targetSelector = el.hasAttribute('href') ? el.getAttribute('href') : el.getAttribute('data-target');
        var target = document.querySelector(targetSelector);

if (!target) {
          throw new Error("Ups, I can't find the target " + targetSelector + ".");
        } // Add content to container

container.appendChild(target); // Register type

container.setAttribute('data-type', 'html');
      },
      onPreload: function onPreload(container) {// Nothing
      },
      onLoad: function onLoad(container) {
        var video = container.querySelector('video');

if (video) {
          if (video.hasAttribute('data-time') && video.readyState > 0) {
            // Continue where video was stopped
            video.currentTime = video.getAttribute('data-time');
          }

if (config.autoplayVideo) {
            // Start playback (and loading if necessary)
            video.play();
          }
        }
      },
      onLeave: function onLeave(container) {
        var video = container.querySelector('video');

if (video) {
          if (!video.paused) {
            // Stop if video is playing
            video.pause();
          } // Backup currentTime (needed for revisit)

if (video.readyState > 0) {
            video.setAttribute('data-time', video.currentTime);
          }
        }
      },
      onCleanup: function onCleanup(container) {
        var video = container.querySelector('video');

if (video) {
          if (video.readyState > 0 && video.readyState < 3 && video.duration !== video.currentTime) {
            // Some data has been loaded but not the whole package.
            // In order to save bandwidth, stop downloading as soon as possible.
            var videoClone = video.cloneNode(true);
            removeSources(video);
            video.load();
            video.parentNode.removeChild(video);
            container.appendChild(videoClone);
          }
        }
      }
    },
    iframe: {
      checkSupport: function checkSupport(el) {
        return checkType(el, 'iframe');
      },
      init: function init(el, container) {
        var iframe = document.createElement('iframe');
        var href = el.hasAttribute('href') ? el.getAttribute('href') : el.getAttribute('data-target');
        iframe.setAttribute('frameborder', '0');
        iframe.setAttribute('src', '');
        iframe.setAttribute('data-src', href);

if (el.getAttribute('data-width')) {
          iframe.style.maxWidth = el.getAttribute('data-width') + "px";
        }

if (el.getAttribute('data-height')) {
          iframe.style.maxHeight = el.getAttribute('data-height') + "px";
        } // Add iframe to container

container.appendChild(iframe); // Register type

container.setAttribute('data-type', 'iframe');
      },
      onPreload: function onPreload(container) {// Nothing
      },
      onLoad: function onLoad(container) {
        var iframe = container.querySelector('iframe');
        iframe.setAttribute('src', iframe.getAttribute('data-src'));
      },
      onLeave: function onLeave(container) {// Nothing
      },
      onCleanup: function onCleanup(container) {// Nothing
      }
    },
    youtube: {
      checkSupport: function checkSupport(el) {
        return checkType(el, 'youtube');
      },
      init: function init(el, container) {
        var iframePlaceholder = document.createElement('div'); // Add iframePlaceholder to container

container.appendChild(iframePlaceholder);
        player[playerId] = new window.YT.Player(iframePlaceholder, {
          host: 'https://www.youtube-nocookie.com',
          height: el.getAttribute('data-height') || '360',
          width: el.getAttribute('data-width') || '640',
          videoId: el.getAttribute('data-id'),
          playerVars: {
            controls: el.getAttribute('data-controls') || 1,
            rel: 0,
            playsinline: 1
          }
        }); // Set player ID

container.setAttribute('data-player', playerId); // Register type

container.setAttribute('data-type', 'youtube');
        playerId++;
      },
      onPreload: function onPreload(container) {// Nothing
      },
      onLoad: function onLoad(container) {
        if (config.autoplayVideo) {
          player[container.getAttribute('data-player')].playVideo();
        }
      },
      onLeave: function onLeave(container) {
        if (player[container.getAttribute('data-player')].getPlayerState() === 1) {
          player[container.getAttribute('data-player')].pauseVideo();
        }
      },
      onCleanup: function onCleanup(container) {
        if (player[container.getAttribute('data-player')].getPlayerState() === 1) {
          player[container.getAttribute('data-player')].pauseVideo();
        }
      }
    }
  };
  /**
   * Add compatible Object.entries support for IE
   * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries#Polyfill
   *
   */

if (!Object.entries) {
    Object.entries = function (obj) {
      var ownProps = Object.keys(obj);
      var i = ownProps.length;
      var resArray = new Array(i);

while (i--) {
        resArray[i] = [ownProps[i], obj[ownProps[i]]];
      }

return resArray;
    };
  }
  /**
   * Init
   *
   */

var init = function init(userOptions) {
    // Merge user options into defaults
    config = mergeOptions(userOptions); // Check if the lightbox already exists

if (!lightbox) {
      createLightbox();
    } // Get a list of all elements within the document

var els = document.querySelectorAll(config.selector);

if (!els) {
      throw new Error("Ups, I can't find the selector " + config.selector + ".");
    } // Execute a few things once per element

Array.prototype.forEach.call(els, function (el) {
      checkDependencies(el);
    });
  };
  /**
   * Check dependencies
   *
   * @param {HTMLElement} el - Element to add
   * @param {function} callback - Optional callback to call after add
   */

var checkDependencies = function checkDependencies(el, callback) {
    // Check if there is a YouTube video and if the YouTube iframe-API is ready
    if (document.querySelector('[data-type="youtube"]') !== null && !isYouTubeDependencieLoaded) {
      if (document.getElementById('iframe_api') === null) {
        var tag = document.createElement('script');
        var firstScriptTag = document.getElementsByTagName('script')[0];
        tag.id = 'iframe_api';
        tag.src = 'https://www.youtube.com/iframe_api';
        firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
      }

if (waitingEls.indexOf(el) === -1) {
        waitingEls.push(el);
      }

var getGroupName = function getGroupName(el) {
    return el.hasAttribute('data-group') ? el.getAttribute('data-group') : 'default';
  };
  /**
   * Copy an object. (The secure way)
   *
   * @param {object} object
   * @return {object}
   */

var copyObject = function copyObject(object) {
    return JSON.parse(JSON.stringify(object));
  };
  /**
   * Add element
   *
   * @param {HTMLElement} el - Element to add
   * @param {function} callback - Optional callback to call after add
   */

var add = function add(el, callback) {
    newGroup = getGroupName(el);

if (!Object.prototype.hasOwnProperty.call(groups, newGroup)) {
      groups[newGroup] = copyObject(groupAtts);
      createSlider();
    } // Check if element already exists

if (groups[newGroup].gallery.indexOf(el) === -1) {
      groups[newGroup].gallery.push(el);
      groups[newGroup].elementsLength++; // Set zoom icon if necessary

if (config.zoom && el.querySelector('img')) {
        var TobiiZoom = document.createElement('div');
        TobiiZoom.className = 'tobii-zoom__icon';
        TobiiZoom.innerHTML = config.zoomText;
        el.classList.add('tobii-zoom');
        el.appendChild(TobiiZoom);
      } // Bind click event handler

el.addEventListener('click', triggerTobii);
      createSlide(el);

if (isOpen() && newGroup === activeGroup) {
        updateConfig();
        updateLightbox();
      }

if (callback) {
        callback.call(this);
      }
    } else {
      throw new Error('Ups, element already added to the lightbox.');
    }
  };
  /**
   * Remove element
   *
   * @param {HTMLElement} el - Element to remove
   * @param {function} callback - Optional callback to call after remove
   */

var remove = function add(el, callback) {
    var groupName = getGroupName(el); // Check if element exists

if (groups[groupName].gallery.indexOf(el) === -1) ; else {
      var slideIndex = groups[groupName].gallery.indexOf(el);
      var slideEl = groups[groupName].sliderElements[slideIndex]; // TODO If the element to be removed is the currently visible slide
      // TODO Remove element
      // groups[groupName].gallery.splice(groups[groupName].gallery.indexOf(el)) don't work

groups[groupName].elementsLength--; // Remove zoom icon if necessary

if (config.zoom && el.querySelector('.tobii-zoom__icon')) {
        var zoomIcon = el.querySelector('.tobii-zoom__icon');
        zoomIcon.parentNode.classList.remove('tobii-zoom');
        zoomIcon.parentNode.removeChild(zoomIcon);
      } // Unbind click event handler

el.removeEventListener('click', triggerTobii); // Remove slide

slideEl.parentNode.removeChild(slideEl);

if (isOpen() && groupName === activeGroup) {
        updateConfig();
        updateLightbox();
      }

if (callback) {
        callback.call(this);
      }
    }
  };
  /**
   * Create the lightbox
   *
   */

var createLightbox = function createLightbox() {
    // Create the lightbox
    lightbox = document.createElement('div');
    lightbox.setAttribute('role', 'dialog');
    lightbox.setAttribute('aria-hidden', 'true');
    lightbox.className = 'tobii'; // Create the previous button

prevButton = document.createElement('button');
    prevButton.className = 'tobii__prev';
    prevButton.setAttribute('type', 'button');
    prevButton.setAttribute('aria-label', config.navLabel[0]);
    prevButton.innerHTML = config.navText[0];
    lightbox.appendChild(prevButton); // Create the next button

nextButton = document.createElement('button');
    nextButton.className = 'tobii__next';
    nextButton.setAttribute('type', 'button');
    nextButton.setAttribute('aria-label', config.navLabel[1]);
    nextButton.innerHTML = config.navText[1];
    lightbox.appendChild(nextButton); // Create the close button

closeButton = document.createElement('button');
    closeButton.className = 'tobii__close';
    closeButton.setAttribute('type', 'button');
    closeButton.setAttribute('aria-label', config.closeLabel);
    closeButton.innerHTML = config.closeText;
    lightbox.appendChild(closeButton); // Create the counter

counter = document.createElement('div');
    counter.className = 'tobii__counter';
    lightbox.appendChild(counter);
    document.body.appendChild(lightbox);
  };
  /**
   * Create a slider
   */

var createSlider = function createSlider() {
    groups[newGroup].slider = document.createElement('div');
    groups[newGroup].slider.className = 'tobii__slider';
    lightbox.appendChild(groups[newGroup].slider);
  };
  /**
   * Create a slide
   *
   */

var createSlide = function createSlide(el) {
    // Detect type
    for (var index in supportedElements) {
      // const index don't work in IE
      if (Object.prototype.hasOwnProperty.call(supportedElements, index)) {
        if (supportedElements[index].checkSupport(el)) {
          // Create slide elements
          var sliderElement = document.createElement('div');
          var sliderElementContent = document.createElement('div');
          sliderElement.className = 'tobii__slider-slide';
          sliderElement.style.position = 'absolute';
          sliderElement.style.left = groups[newGroup].x * 100 + "%"; // Create type elements

supportedElements[index].init(el, sliderElementContent); // Add slide content container to slider element

sliderElement.appendChild(sliderElementContent); // Add slider element to slider

groups[newGroup].slider.appendChild(sliderElement);
          groups[newGroup].sliderElements.push(sliderElement);
          ++groups[newGroup].x;
          break;
        }
      }
    }
  };
  /**
   * Open Tobii
   *
   * @param {number} index - Index to load
   * @param {function} callback - Optional callback to call after open
   */

var open = function open(index, callback) {
    activeGroup = activeGroup !== null ? activeGroup : newGroup;

if (!isOpen() && !index) {
      index = 0;
    }

if (isOpen()) {
      if (!index) {
        throw new Error('Ups, Tobii is aleady open.');
      }

if (index === groups[activeGroup].currentIndex) {
        throw new Error("Ups, slide " + index + " is already selected.");
      }
    }

if (index === -1 || index >= groups[activeGroup].elementsLength) {
      throw new Error("Ups, I can't find slide " + index + ".");
    }

if (config.hideScrollbar) {
      document.documentElement.classList.add('tobii-is-open');
      document.body.classList.add('tobii-is-open');
    }

updateConfig(); // Hide close if necessary

if (!config.close) {
      closeButton.disabled = false;
      closeButton.setAttribute('aria-hidden', 'true');
    } // Save user’s focus

lastFocus = document.activeElement; // Set current index

groups[activeGroup].currentIndex = index;
    clearDrag();
    bindEvents(); // Load slide

load(groups[activeGroup].currentIndex); // Makes lightbox appear, too

lightbox.setAttribute('aria-hidden', 'false');
    updateLightbox(); // Preload previous and next slide

preload(groups[activeGroup].currentIndex + 1);
    preload(groups[activeGroup].currentIndex - 1); // Hack to prevent animation during opening

setTimeout(function () {
      groups[activeGroup].slider.classList.add('tobii__slider--animate');
    }, 1000);

if (callback) {
      callback.call(this);
    }
  };
  /**
   * Close Tobii
   *
   * @param {function} callback - Optional callback to call after close
   */

var close = function close(callback) {
    if (!isOpen()) {
      throw new Error('Tobii is already closed.');
    }

if (config.hideScrollbar) {
      document.documentElement.classList.remove('tobii-is-open');
      document.body.classList.remove('tobii-is-open');
    }

unbindEvents(); // Reenable the user’s focus

lastFocus.focus(); // Don't forget to cleanup our current element

var container = groups[activeGroup].sliderElements[groups[activeGroup].currentIndex].querySelector('[data-type]');
    var type = container.getAttribute('data-type');
    supportedElements[type].onLeave(container);
    supportedElements[type].onCleanup(container);
    lightbox.setAttribute('aria-hidden', 'true'); // Reset current index

groups[activeGroup].currentIndex = 0; // Remove the hack to prevent animation during opening

groups[activeGroup].slider.classList.remove('tobii__slider--animate');

if (callback) {
      callback.call(this);
    }
  };
  /**
   * Preload slide
   *
   * @param {number} index - Index to preload
   */

var preload = function preload(index) {
    if (groups[activeGroup].sliderElements[index] === undefined) {
      return;
    }

var container = groups[activeGroup].sliderElements[index].querySelector('[data-type]');
    var type = container.getAttribute('data-type');
    supportedElements[type].onPreload(container);
  };
  /**
   * Load slide
   * Will be called when opening the lightbox or moving index
   *
   * @param {number} index - Index to load
   */

var load = function load(index) {
    if (groups[activeGroup].sliderElements[index] === undefined) {
      return;
    }

var container = groups[activeGroup].sliderElements[index].querySelector('[data-type]');
    var type = container.getAttribute('data-type');
    supportedElements[type].onLoad(container);
  };
  /**
   * Show the previous slide
   *
   * @param {function} callback - Optional callback function
   */

var prev = function prev(callback) {
    if (groups[activeGroup].currentIndex > 0) {
      leave(groups[activeGroup].currentIndex);
      load(--groups[activeGroup].currentIndex);
      updateLightbox('left');
      cleanup(groups[activeGroup].currentIndex + 1);
      preload(groups[activeGroup].currentIndex - 1);

if (callback) {
        callback.call(this);
      }
    }
  };
  /**
   * Show the next slide
   *
   * @param {function} callback - Optional callback function
   */

var next = function next(callback) {
    if (groups[activeGroup].currentIndex < groups[activeGroup].elementsLength - 1) {
      leave(groups[activeGroup].currentIndex);
      load(++groups[activeGroup].currentIndex);
      updateLightbox('right');
      cleanup(groups[activeGroup].currentIndex - 1);
      preload(groups[activeGroup].currentIndex + 1);

if (callback) {
        callback.call(this);
      }
    }
  };
  /**
   * Leave slide
   * Will be called before moving index
   *
   * @param {number} index - Index to leave
   */

var leave = function leave(index) {
    if (groups[activeGroup].sliderElements[index] === undefined) {
      return;
    }

var container = groups[activeGroup].sliderElements[index].querySelector('[data-type]');
    var type = container.getAttribute('data-type');
    supportedElements[type].onLeave(container);
  };
  /**
   * Cleanup slide
   * Will be called after moving index
   *
   * @param {number} index - Index to cleanup
   */

var cleanup = function cleanup(index) {
    if (groups[activeGroup].sliderElements[index] === undefined) {
      return;
    }

var updateOffset = function updateOffset() {
    activeGroup = activeGroup !== null ? activeGroup : newGroup;
    offset = -groups[activeGroup].currentIndex * lightbox.offsetWidth;
    groups[activeGroup].slider.style.transform = "translate3d(" + offset + "px, 0, 0)";
    offsetTmp = offset;
  };
  /**
   * Update counter
   *
   */

var updateCounter = function updateCounter() {
    counter.textContent = groups[activeGroup].currentIndex + 1 + "/" + groups[activeGroup].elementsLength;
  };
  /**
   * Set focus to the next slide
   *
   * @param {string} dir - Current slide direction
   */

var updateFocus = function updateFocus(dir) {
    var focusableEls = null;

if (config.nav) {
      prevButton.disabled = false;
      nextButton.disabled = false;

if (dir === 'left') {
        prevButton.focus();
      } else {
        nextButton.focus();
      } // If there is only one slide

if (groups[activeGroup].elementsLength === 1) {
        prevButton.disabled = true;
        nextButton.disabled = true;

if (config.close) {
          closeButton.focus();
        }
      } else {
        // If the first slide is displayed
        if (groups[activeGroup].currentIndex === 0) {
          prevButton.disabled = true;
          nextButton.focus();
        } // If the last slide is displayed

if (groups[activeGroup].currentIndex === groups[activeGroup].elementsLength - 1) {
          nextButton.disabled = true;
          prevButton.focus();
        }
      }
    } else if (config.close) {
      closeButton.focus();
    }

focusableEls = lightbox.querySelectorAll('.tobii > button:not(:disabled)');
    firstFocusableEl = focusableEls[0];
    lastFocusableEl = focusableEls.length === 1 ? focusableEls[0] : focusableEls[focusableEls.length - 1];
  };
  /**
   * Clear drag after touchend and mousup event
   *
   */

var clearDrag = function clearDrag() {
    drag = {
      startX: 0,
      endX: 0,
      startY: 0,
      endY: 0
    };
  };
  /**
   * Recalculate drag / swipe event
   *
   */

var updateAfterDrag = function updateAfterDrag() {
    var movementX = drag.endX - drag.startX;
    var movementY = drag.endY - drag.startY;
    var movementXDistance = Math.abs(movementX);
    var movementYDistance = Math.abs(movementY);

if (movementX > 0 && movementXDistance > config.threshold && groups[activeGroup].currentIndex > 0) {
      prev();
    } else if (movementX < 0 && movementXDistance > config.threshold && groups[activeGroup].currentIndex !== groups[activeGroup].elementsLength - 1) {
      next();
    } else if (movementY < 0 && movementYDistance > config.threshold && config.swipeClose) {
      close();
    } else {
      updateOffset();
    }
  };
  /**
   * Resize event using requestAnimationFrame
   *
   */

var triggerTobii = function triggerTobii(event) {
    event.preventDefault();
    activeGroup = getGroupName(this);
    open(groups[activeGroup].gallery.indexOf(this));
  };
  /**
   * Click event handler
   *
   */

event.stopPropagation();
  };
  /**
   * Keydown event handler
   *
   * @TODO: Remove the deprecated event.keyCode when Edge support event.code and we drop f*cking IE
   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode
   */

var touchstartHandler = function touchstartHandler(event) {
    // Prevent dragging / swiping on textareas inputs and selects
    if (isIgnoreElement(event.target)) {
      return;
    }

event.stopPropagation();
    pointerDown = true;
    drag.startX = event.touches[0].pageX;
    drag.startY = event.touches[0].pageY;
    groups[activeGroup].slider.classList.add('tobii__slider--is-dragging');
  };
  /**
   * Touchmove event handler
   *
   */

var touchmoveHandler = function touchmoveHandler(event) {
    event.stopPropagation();

if (pointerDown) {
      event.preventDefault();
      drag.endX = event.touches[0].pageX;
      drag.endY = event.touches[0].pageY;
      doSwipe();
    }
  };
  /**
   * Touchend event handler
   *
   */

var touchendHandler = function touchendHandler(event) {
    event.stopPropagation();
    pointerDown = false;
    groups[activeGroup].slider.classList.remove('tobii__slider--is-dragging');

if (drag.endX) {
      isDraggingX = false;
      isDraggingY = false;
      updateAfterDrag();
    }

clearDrag();
  };
  /**
   * Mousedown event handler
   *
   */

var mousedownHandler = function mousedownHandler(event) {
    // Prevent dragging / swiping on textareas inputs and selects
    if (isIgnoreElement(event.target)) {
      return;
    }

event.preventDefault();
    event.stopPropagation();
    pointerDown = true;
    drag.startX = event.pageX;
    drag.startY = event.pageY;
    groups[activeGroup].slider.classList.add('tobii__slider--is-dragging');
  };
  /**
   * Mousemove event handler
   *
   */

var mousemoveHandler = function mousemoveHandler(event) {
    event.preventDefault();

if (pointerDown) {
      drag.endX = event.pageX;
      drag.endY = event.pageY;
      doSwipe();
    }
  };
  /**
   * Mouseup event handler
   *
   */

var mouseupHandler = function mouseupHandler(event) {
    event.stopPropagation();
    pointerDown = false;
    groups[activeGroup].slider.classList.remove('tobii__slider--is-dragging');

if (drag.endX) {
      isDraggingX = false;
      isDraggingY = false;
      updateAfterDrag();
    }

clearDrag();
  };
  /**
   * Decide whether to do horizontal of vertical swipe
   *
   */

var bindEvents = function bindEvents() {
    if (config.keyboard) {
      browserWindow.addEventListener('keydown', keydownHandler);
    } // Resize event

browserWindow.addEventListener('resize', resizeHandler); // Click event

lightbox.addEventListener('click', clickHandler);

if (config.draggable) {
      if (isTouchDevice()) {
        // Touch events
        lightbox.addEventListener('touchstart', touchstartHandler);
        lightbox.addEventListener('touchmove', touchmoveHandler);
        lightbox.addEventListener('touchend', touchendHandler);
      } // Mouse events

lightbox.addEventListener('mousedown', mousedownHandler);
      lightbox.addEventListener('mouseup', mouseupHandler);
      lightbox.addEventListener('mousemove', mousemoveHandler);
    }
  };
  /**
   * Unbind events
   *
   */

var unbindEvents = function unbindEvents() {
    if (config.keyboard) {
      browserWindow.removeEventListener('keydown', keydownHandler);
    } // Resize event

browserWindow.removeEventListener('resize', resizeHandler); // Click event

lightbox.removeEventListener('click', clickHandler);

if (config.draggable) {
      if (isTouchDevice()) {
        // Touch events
        lightbox.removeEventListener('touchstart', touchstartHandler);
        lightbox.removeEventListener('touchmove', touchmoveHandler);
        lightbox.removeEventListener('touchend', touchendHandler);
      } // Mouse events

lightbox.removeEventListener('mousedown', mousedownHandler);
      lightbox.removeEventListener('mouseup', mouseupHandler);
      lightbox.removeEventListener('mousemove', mousemoveHandler);
    }
  };
  /**
   * Checks whether element has requested data-type value
   *
   */

var checkType = function checkType(el, type) {
    return el.getAttribute('data-type') === type;
  };
  /**
   * Remove all `src` attributes
   *
   * @param {HTMLElement} el - Element to remove all `src` attributes
   */

var removeSources = function setVideoSources(el) {
    var sources = el.querySelectorAll('src');

if (sources) {
      Array.prototype.forEach.call(sources, function (source) {
        source.setAttribute('src', '');
      });
    }
  };
  /**
   * Update Config
   *
   */

var updateConfig = function updateConfig() {
    if (config.draggable && groups[activeGroup].elementsLength > 1 && !groups[activeGroup].slider.classList.contains('tobii__slider--is-draggable')) {
      groups[activeGroup].slider.classList.add('tobii__slider--is-draggable');
    } // Hide buttons if necessary

if (!config.nav || groups[activeGroup].elementsLength === 1 || config.nav === 'auto' && isTouchDevice()) {
      prevButton.setAttribute('aria-hidden', 'true');
      nextButton.setAttribute('aria-hidden', 'true');
    } else {
      prevButton.setAttribute('aria-hidden', 'false');
      nextButton.setAttribute('aria-hidden', 'false');
    } // Hide counter if necessary

if (!config.counter || groups[activeGroup].elementsLength === 1) {
      counter.setAttribute('aria-hidden', 'true');
    } else {
      counter.setAttribute('aria-hidden', 'false');
    }
  };
  /**
   * Update slider
   */

var updateLightbox = function updateLightbox(dir) {
    updateSlider();
    updateOffset();
    updateCounter();
    updateFocus(dir);
  };
  /**
   * Destroy Tobii
   *
   * @param {function} callback - Optional callback to call after destroy
   */

var destroy = function destroy(callback) {
    if (isOpen()) {
      close();
    } // TODO Cleanup

if (callback) {
      callback.call(this);
    }
  };
  /**
   * Check if Tobii is open
   *
   */

var isOpen = function isOpen() {
    return lightbox.getAttribute('aria-hidden') === 'false';
  };
  /**
   * Detect whether device is touch capable
   *
   */

var isTouchDevice = function isTouchDevice() {
    return 'ontouchstart' in window;
  };
  /**
   * Checks whether element's nodeName is part of array
   *
   */

var isIgnoreElement = function isIgnoreElement(el) {
    return ['TEXTAREA', 'OPTION', 'INPUT', 'SELECT'].indexOf(el.nodeName) !== -1 || el === prevButton || el === nextButton || el === closeButton || groups[activeGroup].elementsLength === 1;
  };
  /**
   * Return current index
   *
   */

var currentSlide = function currentSlide() {
    return groups[activeGroup].currentIndex;
  };
  /**
   * Return current group
   *
   */

var currentGroup = function currentGroup() {
    return activeGroup !== null ? activeGroup : newGroup;
  };
  /**
   * Select a specific group
   *
   * @param {string} name
   */

var selectGroup = function selectGroup(name) {
    if (isOpen()) {
      throw new Error('Ups, I can\'t do this. Tobii is open.');
    }

if (!name) {
      return;
    }

if (name && !Object.prototype.hasOwnProperty.call(groups, name)) {
      throw new Error("Ups, I don't have a group called \"" + name + "\".");
    }

activeGroup = name;
  };

init(userOptions);
  return {
    open: open,
    prev: prev,
    next: next,
    close: close,
    add: checkDependencies,
    remove: remove,
    destroy: destroy,
    isOpen: isOpen,
    currentSlide: currentSlide,
    selectGroup: selectGroup,
    currentGroup: currentGroup
  };
}

module.exports = Tobii;

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