text: /*
   * blueimp Gallery JS
   * https://github.com/blueimp/Gallery
   *
   * Copyright 2013, Sebastian Tschan
   * https://blueimp.net
   *
   * Swipe implementation based on
   * https://github.com/bradbirdsall/Swipe
   *
   * Licensed under the MIT license:
   * http://www.opensource.org/licenses/MIT
   */
  
  /* global define, window, document, DocumentTouch */
  
  ;(function (factory) {
    'use strict'
    if (typeof define === 'function' && define.amd) {
      // Register as an anonymous AMD module:
      define(['./blueimp-helper'], factory)
    } else {
      // Browser globals:
      window.blueimp = window.blueimp || {}
      window.blueimp.Gallery = factory(
        window.blueimp.helper || window.jQuery
      )
    }
  }(function ($) {
    'use strict'
  
    function Gallery (list, options) {
      if (document.body.style.maxHeight === undefined) {
        // document.body.style.maxHeight is undefined on IE6 and lower
        return null
      }
      if (!this || this.options !== Gallery.prototype.options) {
        // Called as function instead of as constructor,
        // so we simply return a new instance:
        return new Gallery(list, options)
      }
      if (!list || !list.length) {
        this.console.log(
          'blueimp Gallery: No or empty list provided as first argument.',
          list
        )
        return
      }
      this.list = list
      this.num = list.length
      this.initOptions(options)
      this.initialize()
    }
  
    $.extend(Gallery.prototype, {
      options: {
        // The Id, element or querySelector of the gallery widget:
        container: '#blueimp-gallery',
        // The tag name, Id, element or querySelector of the slides container:
        slidesContainer: 'div',
        // The tag name, Id, element or querySelector of the title element:
        titleElement: 'h3',
        // The class to add when the gallery is visible:
        displayClass: 'blueimp-gallery-display',
        // The class to add when the gallery controls are visible:
        controlsClass: 'blueimp-gallery-controls',
        // The class to add when the gallery only displays one element:
        singleClass: 'blueimp-gallery-single',
        // The class to add when the left edge has been reached:
        leftEdgeClass: 'blueimp-gallery-left',
        // The class to add when the right edge has been reached:
        rightEdgeClass: 'blueimp-gallery-right',
        // The class to add when the automatic slideshow is active:
        playingClass: 'blueimp-gallery-playing',
        // The class for all slides:
        slideClass: 'slide',
        // The slide class for loading elements:
        slideLoadingClass: 'slide-loading',
        // The slide class for elements that failed to load:
        slideErrorClass: 'slide-error',
        // The class for the content element loaded into each slide:
        slideContentClass: 'slide-content',
        // The class for the "toggle" control:
        toggleClass: 'toggle',
        // The class for the "prev" control:
        prevClass: 'prev',
        // The class for the "next" control:
        nextClass: 'next',
        // The class for the "close" control:
        closeClass: 'close',
        // The class for the "play-pause" toggle control:
        playPauseClass: 'play-pause',
        // The list object property (or data attribute) with the object type:
        typeProperty: 'type',
        // The list object property (or data attribute) with the object title:
        titleProperty: 'title',
        // The list object property (or data attribute) with the object URL:
        urlProperty: 'href',
        // The list object property (or data attribute) with the object srcset URL(s):
        srcsetProperty: 'urlset',
        // The gallery listens for transitionend events before triggering the
        // opened and closed events, unless the following option is set to false:
        displayTransition: true,
        // Defines if the gallery slides are cleared from the gallery modal,
        // or reused for the next gallery initialization:
        clearSlides: true,
        // Defines if images should be stretched to fill the available space,
        // while maintaining their aspect ratio (will only be enabled for browsers
        // supporting background-size="contain", which excludes IE < 9).
        // Set to "cover", to make images cover all available space (requires
        // support for background-size="cover", which excludes IE < 9):
        stretchImages: false,
        // Toggle the controls on pressing the Return key:
        toggleControlsOnReturn: true,
        // Toggle the controls on slide click:
        toggleControlsOnSlideClick: true,
        // Toggle the automatic slideshow interval on pressing the Space key:
        toggleSlideshowOnSpace: true,
        // Navigate the gallery by pressing left and right on the keyboard:
        enableKeyboardNavigation: true,
        // Close the gallery on pressing the Esc key:
        closeOnEscape: true,
        // Close the gallery when clicking on an empty slide area:
        closeOnSlideClick: true,
        // Close the gallery by swiping up or down:
        closeOnSwipeUpOrDown: true,
        // Emulate touch events on mouse-pointer devices such as desktop browsers:
        emulateTouchEvents: true,
        // Stop touch events from bubbling up to ancestor elements of the Gallery:
        stopTouchEventsPropagation: false,
        // Hide the page scrollbars:
        hidePageScrollbars: true,
        // Stops any touches on the container from scrolling the page:
        disableScroll: true,
        // Carousel mode (shortcut for carousel specific options):
        carousel: false,
        // Allow continuous navigation, moving from last to first
        // and from first to last slide:
        continuous: true,
        // Remove elements outside of the preload range from the DOM:
        unloadElements: true,
        // Start with the automatic slideshow:
        startSlideshow: false,
        // Delay in milliseconds between slides for the automatic slideshow:
        slideshowInterval: 5000,
        // The starting index as integer.
        // Can also be an object of the given list,
        // or an equal object with the same url property:
        index: 0,
        // The number of elements to load around the current index:
        preloadRange: 2,
        // The transition speed between slide changes in milliseconds:
        transitionSpeed: 400,
        // The transition speed for automatic slide changes, set to an integer
        // greater 0 to override the default transition speed:
        slideshowTransitionSpeed: undefined,
        // The event object for which the default action will be canceled
        // on Gallery initialization (e.g. the click event to open the Gallery):
        event: undefined,
        // Callback function executed when the Gallery is initialized.
        // Is called with the gallery instance as "this" object:
        onopen: undefined,
        // Callback function executed when the Gallery has been initialized
        // and the initialization transition has been completed.
        // Is called with the gallery instance as "this" object:
        onopened: undefined,
        // Callback function executed on slide change.
        // Is called with the gallery instance as "this" object and the
        // current index and slide as arguments:
        onslide: undefined,
        // Callback function executed after the slide change transition.
        // Is called with the gallery instance as "this" object and the
        // current index and slide as arguments:
        onslideend: undefined,
        // Callback function executed on slide content load.
        // Is called with the gallery instance as "this" object and the
        // slide index and slide element as arguments:
        onslidecomplete: undefined,
        // Callback function executed when the Gallery is about to be closed.
        // Is called with the gallery instance as "this" object:
        onclose: undefined,
        // Callback function executed when the Gallery has been closed
        // and the closing transition has been completed.
        // Is called with the gallery instance as "this" object:
        onclosed: undefined
      },
  
      carouselOptions: {
        hidePageScrollbars: false,
        toggleControlsOnReturn: false,
        toggleSlideshowOnSpace: false,
        enableKeyboardNavigation: false,
        closeOnEscape: false,
        closeOnSlideClick: false,
        closeOnSwipeUpOrDown: false,
        disableScroll: false,
        startSlideshow: true
      },
  
      console: window.console && typeof window.console.log === 'function'
        ? window.console
        : {log: function () {}},
  
      // Detect touch, transition, transform and background-size support:
      support: (function (element) {
        var support = {
          touch: window.ontouchstart !== undefined ||
            (window.DocumentTouch && document instanceof DocumentTouch)
        }
        var transitions = {
          webkitTransition: {
            end: 'webkitTransitionEnd',
            prefix: '-webkit-'
          },
          MozTransition: {
            end: 'transitionend',
            prefix: '-moz-'
          },
          OTransition: {
            end: 'otransitionend',
            prefix: '-o-'
          },
          transition: {
            end: 'transitionend',
            prefix: ''
          }
        }
        var prop
        for (prop in transitions) {
          if (transitions.hasOwnProperty(prop) &&
            element.style[prop] !== undefined) {
            support.transition = transitions[prop]
            support.transition.name = prop
            break
          }
        }
        function elementTests () {
          var transition = support.transition
          var prop
          var translateZ
          document.body.appendChild(element)
          if (transition) {
            prop = transition.name.slice(0, -9) + 'ransform'
            if (element.style[prop] !== undefined) {
              element.style[prop] = 'translateZ(0)'
              translateZ = window.getComputedStyle(element)
                .getPropertyValue(transition.prefix + 'transform')
              support.transform = {
                prefix: transition.prefix,
                name: prop,
                translate: true,
                translateZ: !!translateZ && translateZ !== 'none'
              }
            }
          }
          if (element.style.backgroundSize !== undefined) {
            support.backgroundSize = {}
            element.style.backgroundSize = 'contain'
            support.backgroundSize.contain = window
              .getComputedStyle(element)
              .getPropertyValue('background-size') === 'contain'
            element.style.backgroundSize = 'cover'
            support.backgroundSize.cover = window
              .getComputedStyle(element)
              .getPropertyValue('background-size') === 'cover'
          }
          document.body.removeChild(element)
        }
        if (document.body) {
          elementTests()
        } else {
          $(document).on('DOMContentLoaded', elementTests)
        }
        return support
      // Test element, has to be standard HTML and must not be hidden
      // for the CSS3 tests using window.getComputedStyle to be applicable:
      }(document.createElement('div'))),
  
      requestAnimationFrame: window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame,
  
      initialize: function () {
        this.initStartIndex()
        if (this.initWidget() === false) {
          return false
        }
        this.initEventListeners()
        // Load the slide at the given index:
        this.onslide(this.index)
        // Manually trigger the slideend event for the initial slide:
        this.ontransitionend()
        // Start the automatic slideshow if applicable:
        if (this.options.startSlideshow) {
          this.play()
        }
      },
  
      slide: function (to, speed) {
        window.clearTimeout(this.timeout)
        var index = this.index
        var direction
        var naturalDirection
        var diff
        if (index === to || this.num === 1) {
          return
        }
        if (!speed) {
          speed = this.options.transitionSpeed
        }
        if (this.support.transform) {
          if (!this.options.continuous) {
            to = this.circle(to)
          }
          // 1: backward, -1: forward:
          direction = Math.abs(index - to) / (index - to)
          // Get the actual position of the slide:
          if (this.options.continuous) {
            naturalDirection = direction
            direction = -this.positions[this.circle(to)] / this.slideWidth
            // If going forward but to < index, use to = slides.length + to
            // If going backward but to > index, use to = -slides.length + to
            if (direction !== naturalDirection) {
              to = -direction * this.num + to
            }
          }
          diff = Math.abs(index - to) - 1
          // Move all the slides between index and to in the right direction:
          while (diff) {
            diff -= 1
            this.move(
              this.circle((to > index ? to : index) - diff - 1),
              this.slideWidth * direction,
              0
            )
          }
          to = this.circle(to)
          this.move(index, this.slideWidth * direction, speed)
          this.move(to, 0, speed)
          if (this.options.continuous) {
            this.move(
              this.circle(to - direction),
              -(this.slideWidth * direction),
              0
            )
          }
        } else {
          to = this.circle(to)
          this.animate(index * -this.slideWidth, to * -this.slideWidth, speed)
        }
        this.onslide(to)
      },
  
      getIndex: function () {
        return this.index
      },
  
      getNumber: function () {
        return this.num
      },
  
      prev: function () {
        if (this.options.continuous || this.index) {
          this.slide(this.index - 1)
        }
      },
  
      next: function () {
        if (this.options.continuous || this.index < this.num - 1) {
          this.slide(this.index + 1)
        }
      },
  
      play: function (time) {
        var that = this
        window.clearTimeout(this.timeout)
        this.interval = time || this.options.slideshowInterval
        if (this.elements[this.index] > 1) {
          this.timeout = this.setTimeout(
            (!this.requestAnimationFrame && this.slide) || function (to, speed) {
              that.animationFrameId = that.requestAnimationFrame.call(
                window,
                function () {
                  that.slide(to, speed)
                }
              )
            },
            [this.index + 1, this.options.slideshowTransitionSpeed],
            this.interval
          )
        }
        this.container.addClass(this.options.playingClass)
      },
  
      pause: function () {
        window.clearTimeout(this.timeout)
        this.interval = null
        this.container.removeClass(this.options.playingClass)
      },
  
      add: function (list) {
        var i
        if (!list.concat) {
          // Make a real array out of the list to add:
          list = Array.prototype.slice.call(list)
        }
        if (!this.list.concat) {
          // Make a real array out of the Gallery list:
          this.list = Array.prototype.slice.call(this.list)
        }
        this.list = this.list.concat(list)
        this.num = this.list.length
        if (this.num > 2 && this.options.continuous === null) {
          this.options.continuous = true
          this.container.removeClass(this.options.leftEdgeClass)
        }
        this.container
          .removeClass(this.options.rightEdgeClass)
          .removeClass(this.options.singleClass)
        for (i = this.num - list.length; i < this.num; i += 1) {
          this.addSlide(i)
          this.positionSlide(i)
        }
        this.positions.length = this.num
        this.initSlides(true)
      },
  
      resetSlides: function () {
        this.slidesContainer.empty()
        this.unloadAllSlides()
        this.slides = []
      },
  
      handleClose: function () {
        var options = this.options
        this.destroyEventListeners()
        // Cancel the slideshow:
        this.pause()
        this.container[0].style.display = 'none'
        this.container
          .removeClass(options.displayClass)
          .removeClass(options.singleClass)
          .removeClass(options.leftEdgeClass)
          .removeClass(options.rightEdgeClass)
        if (options.hidePageScrollbars) {
          document.body.style.overflow = this.bodyOverflowStyle
        }
        if (this.options.clearSlides) {
          this.resetSlides()
        }
        if (this.options.onclosed) {
          this.options.onclosed.call(this)
        }
      },
  
      close: function () {
        var that = this
        function closeHandler (event) {
          if (event.target === that.container[0]) {
            that.container.off(
              that.support.transition.end,
              closeHandler
            )
            that.handleClose()
          }
        }
        if (this.options.onclose) {
          this.options.onclose.call(this)
        }
        if (this.support.transition && this.options.displayTransition) {
          this.container.on(
            this.support.transition.end,
            closeHandler
          )
          this.container.removeClass(this.options.displayClass)
        } else {
          this.handleClose()
        }
      },
  
      circle: function (index) {
        // Always return a number inside of the slides index range:
        return (this.num + (index % this.num)) % this.num
      },
  
      move: function (index, dist, speed) {
        this.translateX(index, dist, speed)
        this.positions[index] = dist
      },
  
      translate: function (index, x, y, speed) {
        var style = this.slides[index].style
        var transition = this.support.transition
        var transform = this.support.transform
        style[transition.name + 'Duration'] = speed + 'ms'
        style[transform.name] = 'translate(' + x + 'px, ' + y + 'px)' +
        (transform.translateZ ? ' translateZ(0)' : '')
      },
  
      translateX: function (index, x, speed) {
        this.translate(index, x, 0, speed)
      },
  
      translateY: function (index, y, speed) {
        this.translate(index, 0, y, speed)
      },
  
      animate: function (from, to, speed) {
        if (!speed) {
          this.slidesContainer[0].style.left = to + 'px'
          return
        }
        var that = this
        var start = new Date().getTime()
        var timer = window.setInterval(function () {
          var timeElap = new Date().getTime() - start
          if (timeElap > speed) {
            that.slidesContainer[0].style.left = to + 'px'
            that.ontransitionend()
            window.clearInterval(timer)
            return
          }
          that.slidesContainer[0].style.left = (((to - from) *
            (Math.floor((timeElap / speed) * 100) / 100)) +
            from) + 'px'
        }, 4)
      },
  
      preventDefault: function (event) {
        if (event.preventDefault) {
          event.preventDefault()
        } else {
          event.returnValue = false
        }
      },
  
      stopPropagation: function (event) {
        if (event.stopPropagation) {
          event.stopPropagation()
        } else {
          event.cancelBubble = true
        }
      },
  
      onresize: function () {
        this.initSlides(true)
      },
  
      onmousedown: function (event) {
        // Trigger on clicks of the left mouse button only
        // and exclude video elements:
        if (event.which && event.which === 1 &&
          event.target.nodeName !== 'VIDEO') {
          // Preventing the default mousedown action is required
          // to make touch emulation work with Firefox:
          event.preventDefault()
          ;(event.originalEvent || event).touches = [{
            pageX: event.pageX,
            pageY: event.pageY
          }]
          this.ontouchstart(event)
        }
      },
  
      onmousemove: function (event) {
        if (this.touchStart) {
          (event.originalEvent || event).touches = [{
            pageX: event.pageX,
            pageY: event.pageY
          }]
          this.ontouchmove(event)
        }
      },
  
      onmouseup: function (event) {
        if (this.touchStart) {
          this.ontouchend(event)
          delete this.touchStart
        }
      },
  
      onmouseout: function (event) {
        if (this.touchStart) {
          var target = event.target
          var related = event.relatedTarget
          if (!related || (related !== target &&
            !$.contains(target, related))) {
            this.onmouseup(event)
          }
        }
      },
  
      ontouchstart: function (event) {
        if (this.options.stopTouchEventsPropagation) {
          this.stopPropagation(event)
        }
        // jQuery doesn't copy touch event properties by default,
        // so we have to access the originalEvent object:
        var touches = (event.originalEvent || event).touches[0]
        this.touchStart = {
          // Remember the initial touch coordinates:
          x: touches.pageX,
          y: touches.pageY,
          // Store the time to determine touch duration:
          time: Date.now()
        }
        // Helper variable to detect scroll movement:
        this.isScrolling = undefined
        // Reset delta values:
        this.touchDelta = {}
      },
  
      ontouchmove: function (event) {
        if (this.options.stopTouchEventsPropagation) {
          this.stopPropagation(event)
        }
        // jQuery doesn't copy touch event properties by default,
        // so we have to access the originalEvent object:
        var touches = (event.originalEvent || event).touches[0]
        var scale = (event.originalEvent || event).scale
        var index = this.index
        var touchDeltaX
        var indices
        // Ensure this is a one touch swipe and not, e.g. a pinch:
        if (touches.length > 1 || (scale && scale !== 1)) {
          return
        }
        if (this.options.disableScroll) {
          event.preventDefault()
        }
        // Measure change in x and y coordinates:
        this.touchDelta = {
          x: touches.pageX - this.touchStart.x,
          y: touches.pageY - this.touchStart.y
        }
        touchDeltaX = this.touchDelta.x
        // Detect if this is a vertical scroll movement (run only once per touch):
        if (this.isScrolling === undefined) {
          this.isScrolling = this.isScrolling ||
          Math.abs(touchDeltaX) < Math.abs(this.touchDelta.y)
        }
        if (!this.isScrolling) {
          // Always prevent horizontal scroll:
          event.preventDefault()
          // Stop the slideshow:
          window.clearTimeout(this.timeout)
          if (this.options.continuous) {
            indices = [
              this.circle(index + 1),
              index,
              this.circle(index - 1)
            ]
          } else {
            // Increase resistance if first slide and sliding left
            // or last slide and sliding right:
            this.touchDelta.x = touchDeltaX =
              touchDeltaX /
              (
              ((!index && touchDeltaX > 0) ||
              (index === this.num - 1 && touchDeltaX < 0))
                ? (Math.abs(touchDeltaX) / this.slideWidth + 1)
                : 1
            )
            indices = [index]
            if (index) {
              indices.push(index - 1)
            }
            if (index < this.num - 1) {
              indices.unshift(index + 1)
            }
          }
          while (indices.length) {
            index = indices.pop()
            this.translateX(index, touchDeltaX + this.positions[index], 0)
          }
        } else if (this.options.closeOnSwipeUpOrDown) {
          this.translateY(index, this.touchDelta.y + this.positions[index], 0)
        }
      },
  
      ontouchend: function (event) {
        if (this.options.stopTouchEventsPropagation) {
          this.stopPropagation(event)
        }
        var index = this.index
        var speed = this.options.transitionSpeed
        var slideWidth = this.slideWidth
        var isShortDuration = Number(Date.now() - this.touchStart.time) < 250
        // Determine if slide attempt triggers next/prev slide:
        var isValidSlide =
        (isShortDuration && Math.abs(this.touchDelta.x) > 20) ||
          Math.abs(this.touchDelta.x) > slideWidth / 2
        // Determine if slide attempt is past start or end:
        var isPastBounds = (!index && this.touchDelta.x > 0) ||
          (index === this.num - 1 && this.touchDelta.x < 0)
        var isValidClose = !isValidSlide && this.options.closeOnSwipeUpOrDown &&
          ((isShortDuration && Math.abs(this.touchDelta.y) > 20) ||
          Math.abs(this.touchDelta.y) > this.slideHeight / 2)
        var direction
        var indexForward
        var indexBackward
        var distanceForward
        var distanceBackward
        if (this.options.continuous) {
          isPastBounds = false
        }
        // Determine direction of swipe (true: right, false: left):
        direction = this.touchDelta.x < 0 ? -1 : 1
        if (!this.isScrolling) {
          if (isValidSlide && !isPastBounds) {
            indexForward = index + direction
            indexBackward = index - direction
            distanceForward = slideWidth * direction
            distanceBackward = -slideWidth * direction
            if (this.options.continuous) {
              this.move(this.circle(indexForward), distanceForward, 0)
              this.move(this.circle(index - 2 * direction), distanceBackward, 0)
            } else if (indexForward >= 0 &&
              indexForward < this.num) {
              this.move(indexForward, distanceForward, 0)
            }
            this.move(index, this.positions[index] + distanceForward, speed)
            this.move(
              this.circle(indexBackward),
              this.positions[this.circle(indexBackward)] + distanceForward,
              speed
            )
            index = this.circle(indexBackward)
            this.onslide(index)
          } else {
            // Move back into position
            if (this.options.continuous) {
              this.move(this.circle(index - 1), -slideWidth, speed)
              this.move(index, 0, speed)
              this.move(this.circle(index + 1), slideWidth, speed)
            } else {
              if (index) {
                this.move(index - 1, -slideWidth, speed)
              }
              this.move(index, 0, speed)
              if (index < this.num - 1) {
                this.move(index + 1, slideWidth, speed)
              }
            }
          }
        } else {
          if (isValidClose) {
            this.close()
          } else {
            // Move back into position
            this.translateY(index, 0, speed)
          }
        }
      },
  
      ontouchcancel: function (event) {
        if (this.touchStart) {
          this.ontouchend(event)
          delete this.touchStart
        }
      },
  
      ontransitionend: function (event) {
        var slide = this.slides[this.index]
        if (!event || slide === event.target) {
          if (this.interval) {
            this.play()
          }
          this.setTimeout(
            this.options.onslideend,
            [this.index, slide]
          )
        }
      },
  
      oncomplete: function (event) {
        var target = event.target || event.srcElement
        var parent = target && target.parentNode
        var index
        if (!target || !parent) {
          return
        }
        index = this.getNodeIndex(parent)
        $(parent).removeClass(this.options.slideLoadingClass)
        if (event.type === 'error') {
          $(parent).addClass(this.options.slideErrorClass)
          this.elements[index] = 3 // Fail
        } else {
          this.elements[index] = 2 // Done
        }
        // Fix for IE7's lack of support for percentage max-height:
        if (target.clientHeight > this.container[0].clientHeight) {
          target.style.maxHeight = this.container[0].clientHeight
        }
        if (this.interval && this.slides[this.index] === parent) {
          this.play()
        }
        this.setTimeout(
          this.options.onslidecomplete,
          [index, parent]
        )
      },
  
      onload: function (event) {
        this.oncomplete(event)
      },
  
      onerror: function (event) {
        this.oncomplete(event)
      },
  
      onkeydown: function (event) {
        switch (event.which || event.keyCode) {
          case 13: // Return
            if (this.options.toggleControlsOnReturn) {
              this.preventDefault(event)
              this.toggleControls()
            }
            break
          case 27: // Esc
            if (this.options.closeOnEscape) {
              this.close()
              // prevent Esc from closing other things
              event.stopImmediatePropagation()
            }
            break
          case 32: // Space
            if (this.options.toggleSlideshowOnSpace) {
              this.preventDefault(event)
              this.toggleSlideshow()
            }
            break
          case 37: // Left
            if (this.options.enableKeyboardNavigation) {
              this.preventDefault(event)
              this.prev()
            }
            break
          case 39: // Right
            if (this.options.enableKeyboardNavigation) {
              this.preventDefault(event)
              this.next()
            }
            break
        }
      },
  
      handleClick: function (event) {
        var options = this.options
        var target = event.target || event.srcElement
        var parent = target.parentNode
        function isTarget (className) {
          return $(target).hasClass(className) ||
          $(parent).hasClass(className)
        }
        if (isTarget(options.toggleClass)) {
          // Click on "toggle" control
          this.preventDefault(event)
          this.toggleControls()
        } else if (isTarget(options.prevClass)) {
          // Click on "prev" control
          this.preventDefault(event)
          this.prev()
        } else if (isTarget(options.nextClass)) {
          // Click on "next" control
          this.preventDefault(event)
          this.next()
        } else if (isTarget(options.closeClass)) {
          // Click on "close" control
          this.preventDefault(event)
          this.close()
        } else if (isTarget(options.playPauseClass)) {
          // Click on "play-pause" control
          this.preventDefault(event)
          this.toggleSlideshow()
        } else if (parent === this.slidesContainer[0]) {
          // Click on slide background
          if (options.closeOnSlideClick) {
            this.preventDefault(event)
            this.close()
          } else if (options.toggleControlsOnSlideClick) {
            this.preventDefault(event)
            this.toggleControls()
          }
        } else if (parent.parentNode &&
          parent.parentNode === this.slidesContainer[0]) {
          // Click on displayed element
          if (options.toggleControlsOnSlideClick) {
            this.preventDefault(event)
            this.toggleControls()
          }
        }
      },
  
      onclick: function (event) {
        if (this.options.emulateTouchEvents &&
          this.touchDelta && (Math.abs(this.touchDelta.x) > 20 ||
          Math.abs(this.touchDelta.y) > 20)) {
          delete this.touchDelta
          return
        }
        return this.handleClick(event)
      },
  
      updateEdgeClasses: function (index) {
        if (!index) {
          this.container.addClass(this.options.leftEdgeClass)
        } else {
          this.container.removeClass(this.options.leftEdgeClass)
        }
        if (index === this.num - 1) {
          this.container.addClass(this.options.rightEdgeClass)
        } else {
          this.container.removeClass(this.options.rightEdgeClass)
        }
      },
  
      handleSlide: function (index) {
        if (!this.options.continuous) {
          this.updateEdgeClasses(index)
        }
        this.loadElements(index)
        if (this.options.unloadElements) {
          this.unloadElements(index)
        }
        this.setTitle(index)
      },
  
      onslide: function (index) {
        this.index = index
        this.handleSlide(index)
        this.setTimeout(this.options.onslide, [index, this.slides[index]])
      },
  
      setTitle: function (index) {
        var text = this.slides[index].firstChild.title
        var titleElement = this.titleElement
        if (titleElement.length) {
          this.titleElement.empty()
          if (text) {
            titleElement[0].appendChild(document.createTextNode(text))
          }
        }
      },
  
      setTimeout: function (func, args, wait) {
        var that = this
        return func && window.setTimeout(function () {
          func.apply(that, args || [])
        }, wait || 0)
      },
  
      imageFactory: function (obj, callback) {
        var that = this
        var img = this.imagePrototype.cloneNode(false)
        var url = obj
        var backgroundSize = this.options.stretchImages
        var called
        var element
        var title
        function callbackWrapper (event) {
          if (!called) {
            event = {
              type: event.type,
              target: element
            }
            if (!element.parentNode) {
              // Fix for IE7 firing the load event for
              // cached images before the element could
              // be added to the DOM:
              return that.setTimeout(callbackWrapper, [event])
            }
            called = true
            $(img).off('load error', callbackWrapper)
            if (backgroundSize) {
              if (event.type === 'load') {
                element.style.background = 'url("' + url +
                  '") center no-repeat'
                element.style.backgroundSize = backgroundSize
              }
            }
            callback(event)
          }
        }
        if (typeof url !== 'string') {
          url = this.getItemProperty(obj, this.options.urlProperty)
          title = this.getItemProperty(obj, this.options.titleProperty)
        }
        if (backgroundSize === true) {
          backgroundSize = 'contain'
        }
        backgroundSize = this.support.backgroundSize &&
          this.support.backgroundSize[backgroundSize] && backgroundSize
        if (backgroundSize) {
          element = this.elementPrototype.cloneNode(false)
        } else {
          element = img
          img.draggable = false
        }
        if (title) {
          element.title = title
        }
        $(img).on('load error', callbackWrapper)
        img.src = url
        return element
      },
  
      createElement: function (obj, callback) {
        var type = obj && this.getItemProperty(obj, this.options.typeProperty)
        var factory = (type && this[type.split('/')[0] + 'Factory']) ||
          this.imageFactory
        var element = obj && factory.call(this, obj, callback)
        var srcset = this.getItemProperty(obj, this.options.srcsetProperty)
        if (!element) {
          element = this.elementPrototype.cloneNode(false)
          this.setTimeout(callback, [{
            type: 'error',
            target: element
          }])
        }
        if (srcset) {
          element.setAttribute('srcset', srcset)
        }
        $(element).addClass(this.options.slideContentClass)
        return element
      },
  
      loadElement: function (index) {
        if (!this.elements[index]) {
          if (this.slides[index].firstChild) {
            this.elements[index] = $(this.slides[index])
              .hasClass(this.options.slideErrorClass) ? 3 : 2
          } else {
            this.elements[index] = 1 // Loading
            $(this.slides[index]).addClass(this.options.slideLoadingClass)
            this.slides[index].appendChild(this.createElement(
              this.list[index],
              this.proxyListener
            ))
          }
        }
      },
  
      loadElements: function (index) {
        var limit = Math.min(this.num, this.options.preloadRange * 2 + 1)
        var j = index
        var i
        for (i = 0; i < limit; i += 1) {
          // First load the current slide element (0),
          // then the next one (+1),
          // then the previous one (-2),
          // then the next after next (+2), etc.:
          j += i * (i % 2 === 0 ? -1 : 1)
          // Connect the ends of the list to load slide elements for
          // continuous navigation:
          j = this.circle(j)
          this.loadElement(j)
        }
      },
  
      unloadElements: function (index) {
        var i,
          diff
        for (i in this.elements) {
          if (this.elements.hasOwnProperty(i)) {
            diff = Math.abs(index - i)
            if (diff > this.options.preloadRange &&
              diff + this.options.preloadRange < this.num) {
              this.unloadSlide(i)
              delete this.elements[i]
            }
          }
        }
      },
  
      addSlide: function (index) {
        var slide = this.slidePrototype.cloneNode(false)
        slide.setAttribute('data-index', index)
        this.slidesContainer[0].appendChild(slide)
        this.slides.push(slide)
      },
  
      positionSlide: function (index) {
        var slide = this.slides[index]
        slide.style.width = this.slideWidth + 'px'
        if (this.support.transform) {
          slide.style.left = (index * -this.slideWidth) + 'px'
          this.move(
            index, this.index > index
              ? -this.slideWidth
              : (this.index < index ? this.slideWidth : 0),
            0
          )
        }
      },
  
      initSlides: function (reload) {
        var clearSlides,
          i
        if (!reload) {
          this.positions = []
          this.positions.length = this.num
          this.elements = {}
          this.imagePrototype = document.createElement('img')
          this.elementPrototype = document.createElement('div')
          this.slidePrototype = document.createElement('div')
          $(this.slidePrototype).addClass(this.options.slideClass)
          this.slides = this.slidesContainer[0].children
          clearSlides = this.options.clearSlides ||
          this.slides.length !== this.num
        }
        this.slideWidth = this.container[0].offsetWidth
        this.slideHeight = this.container[0].offsetHeight
        this.slidesContainer[0].style.width =
          (this.num * this.slideWidth) + 'px'
        if (clearSlides) {
          this.resetSlides()
        }
        for (i = 0; i < this.num; i += 1) {
          if (clearSlides) {
            this.addSlide(i)
          }
          this.positionSlide(i)
        }
        // Reposition the slides before and after the given index:
        if (this.options.continuous && this.support.transform) {
          this.move(this.circle(this.index - 1), -this.slideWidth, 0)
          this.move(this.circle(this.index + 1), this.slideWidth, 0)
        }
        if (!this.support.transform) {
          this.slidesContainer[0].style.left =
            (this.index * -this.slideWidth) + 'px'
        }
      },
  
      unloadSlide: function (index) {
        var slide,
          firstChild
        slide = this.slides[index]
        firstChild = slide.firstChild
        if (firstChild !== null) {
          slide.removeChild(firstChild)
        }
      },
  
      unloadAllSlides: function () {
        var i,
          len
        for (i = 0, len = this.slides.length; i < len; i++) {
          this.unloadSlide(i)
        }
      },
  
      toggleControls: function () {
        var controlsClass = this.options.controlsClass
        if (this.container.hasClass(controlsClass)) {
          this.container.removeClass(controlsClass)
        } else {
          this.container.addClass(controlsClass)
        }
      },
  
      toggleSlideshow: function () {
        if (!this.interval) {
          this.play()
        } else {
          this.pause()
        }
      },
  
      getNodeIndex: function (element) {
        return parseInt(element.getAttribute('data-index'), 10)
      },
  
      getNestedProperty: function (obj, property) {
        property.replace(
          // Matches native JavaScript notation in a String,
          // e.g. '["doubleQuoteProp"].dotProp[2]'
          /\[(?:'([^']+)'|"([^"]+)"|(\d+))\]|(?:(?:^|\.)([^\.\[]+))/g,
          function (str, singleQuoteProp, doubleQuoteProp, arrayIndex, dotProp) {
            var prop = dotProp || singleQuoteProp || doubleQuoteProp ||
              (arrayIndex && parseInt(arrayIndex, 10))
            if (str && obj) {
              obj = obj[prop]
            }
          }
        )
        return obj
      },
  
      getDataProperty: function (obj, property) {
        if (obj.getAttribute) {
          var prop = obj.getAttribute('data-' +
            property.replace(/([A-Z])/g, '-$1').toLowerCase())
          if (typeof prop === 'string') {
            if (/^(true|false|null|-?\d+(\.\d+)?|\{[\s\S]*\}|\[[\s\S]*\])$/
                .test(prop)) {
              try {
                return $.parseJSON(prop)
              } catch (ignore) {}
            }
            return prop
          }
        }
      },
  
      getItemProperty: function (obj, property) {
        var prop = obj[property]
        if (prop === undefined) {
          prop = this.getDataProperty(obj, property)
          if (prop === undefined) {
            prop = this.getNestedProperty(obj, property)
          }
        }
        return prop
      },
  
      initStartIndex: function () {
        var index = this.options.index
        var urlProperty = this.options.urlProperty
        var i
        // Check if the index is given as a list object:
        if (index && typeof index !== 'number') {
          for (i = 0; i < this.num; i += 1) {
            if (this.list[i] === index ||
              this.getItemProperty(this.list[i], urlProperty) ===
              this.getItemProperty(index, urlProperty)) {
              index = i
              break
            }
          }
        }
        // Make sure the index is in the list range:
        this.index = this.circle(parseInt(index, 10) || 0)
      },
  
      initEventListeners: function () {
        var that = this
        var slidesContainer = this.slidesContainer
        function proxyListener (event) {
          var type = that.support.transition &&
          that.support.transition.end === event.type
            ? 'transitionend'
            : event.type
          that['on' + type](event)
        }
        $(window).on('resize', proxyListener)
        $(document.body).on('keydown', proxyListener)
        this.container.on('click', proxyListener)
        if (this.support.touch) {
          slidesContainer
            .on('touchstart touchmove touchend touchcancel', proxyListener)
        } else if (this.options.emulateTouchEvents &&
          this.support.transition) {
          slidesContainer
            .on('mousedown mousemove mouseup mouseout', proxyListener)
        }
        if (this.support.transition) {
          slidesContainer.on(
            this.support.transition.end,
            proxyListener
          )
        }
        this.proxyListener = proxyListener
      },
  
      destroyEventListeners: function () {
        var slidesContainer = this.slidesContainer
        var proxyListener = this.proxyListener
        $(window).off('resize', proxyListener)
        $(document.body).off('keydown', proxyListener)
        this.container.off('click', proxyListener)
        if (this.support.touch) {
          slidesContainer
            .off('touchstart touchmove touchend touchcancel', proxyListener)
        } else if (this.options.emulateTouchEvents &&
          this.support.transition) {
          slidesContainer
            .off('mousedown mousemove mouseup mouseout', proxyListener)
        }
        if (this.support.transition) {
          slidesContainer.off(
            this.support.transition.end,
            proxyListener
          )
        }
      },
  
      handleOpen: function () {
        if (this.options.onopened) {
          this.options.onopened.call(this)
        }
      },
  
      initWidget: function () {
        var that = this
        function openHandler (event) {
          if (event.target === that.container[0]) {
            that.container.off(
              that.support.transition.end,
              openHandler
            )
            that.handleOpen()
          }
        }
        this.container = $(this.options.container)
        if (!this.container.length) {
          this.console.log(
            'blueimp Gallery: Widget container not found.',
            this.options.container
          )
          return false
        }
        this.slidesContainer = this.container.find(
          this.options.slidesContainer
        ).first()
        if (!this.slidesContainer.length) {
          this.console.log(
            'blueimp Gallery: Slides container not found.',
            this.options.slidesContainer
          )
          return false
        }
        this.titleElement = this.container.find(
          this.options.titleElement
        ).first()
        if (this.num === 1) {
          this.container.addClass(this.options.singleClass)
        }
        if (this.options.onopen) {
          this.options.onopen.call(this)
        }
        if (this.support.transition && this.options.displayTransition) {
          this.container.on(
            this.support.transition.end,
            openHandler
          )
        } else {
          this.handleOpen()
        }
        if (this.options.hidePageScrollbars) {
          // Hide the page scrollbars:
          this.bodyOverflowStyle = document.body.style.overflow
          document.body.style.overflow = 'hidden'
        }
        this.container[0].style.display = 'block'
        this.initSlides()
        this.container.addClass(this.options.displayClass)
      },
  
      initOptions: function (options) {
        // Create a copy of the prototype options:
        this.options = $.extend({}, this.options)
        // Check if carousel mode is enabled:
        if ((options && options.carousel) ||
          (this.options.carousel && (!options || options.carousel !== false))) {
          $.extend(this.options, this.carouselOptions)
        }
        // Override any given options:
        $.extend(this.options, options)
        if (this.num < 3) {
          // 1 or 2 slides cannot be displayed continuous,
          // remember the original option by setting to null instead of false:
          this.options.continuous = this.options.continuous ? null : false
        }
        if (!this.support.transition) {
          this.options.emulateTouchEvents = false
        }
        if (this.options.event) {
          this.preventDefault(this.options.event)
        }
      }
  
    })
  
    return Gallery
  }))
  