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window : this, function factory( Flickity, utils ) {\n\n// ---- Slide ---- //\n\nlet Slide = Flickity.Slide;\n\nSlide.prototype.renderFadePosition = function() {\n};\n\nSlide.prototype.setOpacity = function( alpha ) {\n  this.cells.forEach( ( cell ) => {\n    cell.element.style.opacity = alpha;\n  } );\n};\n\n// ---- Flickity ---- //\n\nFlickity.create.fade = function() {\n  this.fadeIndex = this.selectedIndex;\n  this.prevSelectedIndex = this.selectedIndex;\n  this.on( 'select', this.onSelectFade );\n  this.on( 'dragEnd', this.onDragEndFade );\n  this.on( 'settle', this.onSettleFade );\n  this.on( 'activate', this.onActivateFade );\n  this.on( 'deactivate', this.onDeactivateFade );\n};\n\nlet proto = Flickity.prototype;\n\nlet updateSlides = proto.updateSlides;\nproto.updateSlides = function() {\n  updateSlides.apply( this, arguments );\n  if ( !this.options.fade ) return;\n\n  this.slides.forEach( ( slide, i ) => {\n    // position cells at selected target\n    let slideTargetX = slide.target - slide.x;\n    let firstCellX = slide.cells[0].x;\n    slide.cells.forEach( ( cell ) => {\n      let targetX = cell.x - firstCellX - slideTargetX;\n      this._renderCellPosition( cell, targetX );\n    } );\n    // set initial opacity\n    let alpha = i === this.selectedIndex ? 1 : 0;\n    slide.setOpacity( alpha );\n  } );\n};\n\n/* ---- events ---- */\n\nproto.onSelectFade = function() {\n  // in case of resize, keep fadeIndex within current count\n  this.fadeIndex = Math.min( this.prevSelectedIndex, this.slides.length - 1 );\n  this.prevSelectedIndex = this.selectedIndex;\n};\n\nproto.onSettleFade = function() {\n  delete this.didDragEnd;\n  if ( !this.options.fade ) return;\n\n  // set full and 0 opacity on selected & faded slides\n  this.selectedSlide.setOpacity( 1 );\n  let fadedSlide = this.slides[ this.fadeIndex ];\n  if ( fadedSlide && this.fadeIndex !== this.selectedIndex ) {\n    this.slides[ this.fadeIndex ].setOpacity( 0 );\n  }\n};\n\nproto.onDragEndFade = function() {\n  // set flag\n  this.didDragEnd = true;\n};\n\nproto.onActivateFade = function() {\n  if ( this.options.fade ) {\n    this.element.classList.add('is-fade');\n  }\n};\n\nproto.onDeactivateFade = function() {\n  if ( !this.options.fade ) return;\n\n  this.element.classList.remove('is-fade');\n  // reset opacity\n  this.slides.forEach( ( slide ) => {\n    slide.setOpacity('');\n  } );\n};\n\n/* ---- position & fading ---- */\n\nlet positionSlider = proto.positionSlider;\nproto.positionSlider = function() {\n  if ( !this.options.fade ) {\n    positionSlider.apply( this, arguments );\n    return;\n  }\n\n  this.fadeSlides();\n  this.dispatchScrollEvent();\n};\n\nlet positionSliderAtSelected = proto.positionSliderAtSelected;\nproto.positionSliderAtSelected = function() {\n  if ( this.options.fade ) {\n    // position fade slider at origin\n    this.setTranslateX( 0 );\n  }\n  positionSliderAtSelected.apply( this, arguments );\n};\n\nproto.fadeSlides = function() {\n  if ( this.slides.length < 2 ) return;\n\n  // get slides to fade-in & fade-out\n  let indexes = this.getFadeIndexes();\n  let fadeSlideA = this.slides[ indexes.a ];\n  let fadeSlideB = this.slides[ indexes.b ];\n  let distance = this.wrapDifference( fadeSlideA.target, fadeSlideB.target );\n  let progress = this.wrapDifference( fadeSlideA.target, -this.x );\n  progress /= distance;\n\n  fadeSlideA.setOpacity( 1 - progress );\n  fadeSlideB.setOpacity( progress );\n\n  // hide previous slide\n  let fadeHideIndex = indexes.a;\n  if ( this.isDragging ) {\n    fadeHideIndex = progress > 0.5 ? indexes.a : indexes.b;\n  }\n  let isNewHideIndex = this.fadeHideIndex !== undefined &&\n    this.fadeHideIndex !== fadeHideIndex &&\n    this.fadeHideIndex !== indexes.a &&\n    this.fadeHideIndex !== indexes.b;\n  if ( isNewHideIndex ) {\n    // new fadeHideSlide set, hide previous\n    this.slides[ this.fadeHideIndex ].setOpacity( 0 );\n  }\n  this.fadeHideIndex = fadeHideIndex;\n};\n\nproto.getFadeIndexes = function() {\n  if ( !this.isDragging && !this.didDragEnd ) {\n    return {\n      a: this.fadeIndex,\n      b: this.selectedIndex,\n    };\n  }\n  if ( this.options.wrapAround ) {\n    return this.getFadeDragWrapIndexes();\n  } else {\n    return this.getFadeDragLimitIndexes();\n  }\n};\n\nproto.getFadeDragWrapIndexes = function() {\n  let distances = this.slides.map( function( slide, i ) {\n    return this.getSlideDistance( -this.x, i );\n  }, this );\n  let absDistances = distances.map( function( distance ) {\n    return Math.abs( distance );\n  } );\n  let minDistance = Math.min( ...absDistances );\n  let closestIndex = absDistances.indexOf( minDistance );\n  let distance = distances[ closestIndex ];\n  let len = this.slides.length;\n\n  let delta = distance >= 0 ? 1 : -1;\n  return {\n    a: closestIndex,\n    b: utils.modulo( closestIndex + delta, len ),\n  };\n};\n\nproto.getFadeDragLimitIndexes = function() {\n  // calculate closest previous slide\n  let dragIndex = 0;\n  for ( let i = 0; i < this.slides.length - 1; i++ ) {\n    let slide = this.slides[i];\n    if ( -this.x < slide.target ) {\n      break;\n    }\n    dragIndex = i;\n  }\n  return {\n    a: dragIndex,\n    b: dragIndex + 1,\n  };\n};\n\nproto.wrapDifference = function( a, b ) {\n  let diff = b - a;\n  if ( !this.options.wrapAround ) return diff;\n\n  let diffPlus = diff + this.slideableWidth;\n  let diffMinus = diff - this.slideableWidth;\n  if ( Math.abs( diffPlus ) < Math.abs( diff ) ) {\n    diff = diffPlus;\n  }\n  if ( Math.abs( diffMinus ) < Math.abs( diff ) ) {\n    diff = diffMinus;\n  }\n  return diff;\n};\n\n// ---- wrapAround ---- //\n\nlet _updateWrapShiftCells = proto._updateWrapShiftCells;\nproto._updateWrapShiftCells = function() {\n  if ( this.options.fade ) {\n    // update isWrapping\n    this.isWrapping = this.getIsWrapping();\n  } else {\n    _updateWrapShiftCells.apply( this, arguments );\n  }\n};\n\nlet shiftWrapCells = proto.shiftWrapCells;\nproto.shiftWrapCells = function() {\n  if ( !this.options.fade ) {\n    shiftWrapCells.apply( this, arguments );\n  }\n};\n\nreturn Flickity;\n\n} ) );\n"],"names":["window","factory","module","exports","Flickity","fizzyUIUtils","this","utils","Slide","prototype","renderFadePosition","setOpacity","alpha","cells","forEach","cell","element","style","opacity","create","fade","fadeIndex","selectedIndex","prevSelectedIndex","on","onSelectFade","onDragEndFade","onSettleFade","onActivateFade","onDeactivateFade","proto","updateSlides","apply","arguments","options","slides","slide","i","slideTargetX","target","x","firstCellX","targetX","_renderCellPosition","Math","min","length","didDragEnd","selectedSlide","classList","add","remove","positionSlider","fadeSlides","dispatchScrollEvent","positionSliderAtSelected","setTranslateX","indexes","getFadeIndexes","fadeSlideA","a","fadeSlideB","b","distance","wrapDifference","progress","fadeHideIndex","isDragging","undefined","wrapAround","getFadeDragWrapIndexes","getFadeDragLimitIndexes","distances","map","getSlideDistance","absDistances","abs","minDistance","closestIndex","indexOf","len","delta","modulo","dragIndex","diff","diffPlus","slideableWidth","diffMinus","_updateWrapShiftCells","isWrapping","getIsWrapping","shiftWrapCells"],"sourceRoot":""}