Template:Paris Bettencourt/parallax

/*!

* parallax.js v1.3.1 (http://pixelcog.github.io/parallax.js/)
* @copyright 2015 PixelCog, Inc.
* @license MIT (https://github.com/pixelcog/parallax.js/blob/master/LICENSE)
*/

(function ( $, window, document, undefined ) {

 // Polyfill for requestAnimationFrame
 // via: https://gist.github.com/paulirish/1579671

 (function() {
   var lastTime = 0;
   var vendors = ['ms', 'moz', 'webkit', 'o'];
   for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
     window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
     window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
                                || window[vendors[x]+'CancelRequestAnimationFrame'];
   }

   if (!window.requestAnimationFrame)
     window.requestAnimationFrame = function(callback) {
       var currTime = new Date().getTime();
       var timeToCall = Math.max(0, 16 - (currTime - lastTime));
       var id = window.setTimeout(function() { callback(currTime + timeToCall); },
         timeToCall);
       lastTime = currTime + timeToCall;
       return id;
     };

   if (!window.cancelAnimationFrame)
     window.cancelAnimationFrame = function(id) {
       clearTimeout(id);
     };
 }());

 // Parallax Constructor

 function Parallax(element, options) {
   var self = this;

   if (typeof options == 'object') {
     delete options.refresh;
     delete options.render;
     $.extend(this, options);
   }

   this.$element = $(element);

   if (!this.imageSrc && this.$element.is('img')) {
     this.imageSrc = this.$element.attr('src');
   }

   var positions = (this.position + ).toLowerCase().match(/\S+/g) || [];

   if (positions.length < 1) {
     positions.push('center');
   }
   if (positions.length == 1) {
     positions.push(positions[0]);
   }

   if (positions[0] == 'top' || positions[0] == 'bottom' || positions[1] == 'left' || positions[1] == 'right') {
     positions = [positions[1], positions[0]];
   }

   if (this.positionX != undefined) positions[0] = this.positionX.toLowerCase();
   if (this.positionY != undefined) positions[1] = this.positionY.toLowerCase();

   self.positionX = positions[0];
   self.positionY = positions[1];

   if (this.positionX != 'left' && this.positionX != 'right') {
     if (isNaN(parseInt(this.positionX))) {
       this.positionX = 'center';
     } else {
       this.positionX = parseInt(this.positionX);
     }
   }

   if (this.positionY != 'top' && this.positionY != 'bottom') {
     if (isNaN(parseInt(this.positionY))) {
       this.positionY = 'center';
     } else {
       this.positionY = parseInt(this.positionY);
     }
   }

   this.position =
     this.positionX + (isNaN(this.positionX)?  : 'px') + ' ' +
     this.positionY + (isNaN(this.positionY)?  : 'px');

   if (navigator.userAgent.match(/(iPod|iPhone|iPad)/)) {
     if (this.iosFix && !this.$element.is('img')) {
       this.$element.css({
         backgroundImage: 'url(' + this.imageSrc + ')',
         backgroundSize: 'cover',
         backgroundPosition: this.position
       });
     }
     return this;
   }

   if (navigator.userAgent.match(/(Android)/)) {
     if (this.androidFix && !this.$element.is('img')) {
       this.$element.css({
         backgroundImage: 'url(' + this.imageSrc + ')',
         backgroundSize: 'cover',
         backgroundPosition: this.position
       });
     }
     return this;
   }

   this.$mirror = $('<div />').prependTo('body');
   this.$slider = $('<img />').prependTo(this.$mirror);

   this.$mirror.addClass('parallax-mirror').css({
     visibility: 'hidden',
     zIndex: this.zIndex,
     position: 'fixed',
     top: 0,
     left: 0,
     overflow: 'hidden'
   });

   this.$slider.addClass('parallax-slider').one('load', function() {
     if (!self.naturalHeight || !self.naturalWidth) {
       self.naturalHeight = this.naturalHeight || this.height || 1;
       self.naturalWidth  = this.naturalWidth  || this.width  || 1;
     }
     self.aspectRatio = self.naturalWidth / self.naturalHeight;

     Parallax.isSetup || Parallax.setup();
     Parallax.sliders.push(self);
     Parallax.isFresh = false;
     Parallax.requestRender();
   });

   this.$slider[0].src = this.imageSrc;

   if (this.naturalHeight && this.naturalWidth || this.$slider[0].complete) {
     this.$slider.trigger('load');
   }

 };

 // Parallax Instance Methods

 $.extend(Parallax.prototype, {
   speed:    0.2,
   bleed:    0,
   zIndex:   -100,
   iosFix:   true,
   androidFix: true,
   position: 'center',
   overScrollFix: false,

   refresh: function() {
     this.boxWidth        = this.$element.outerWidth();
     this.boxHeight       = this.$element.outerHeight() + this.bleed * 2;
     this.boxOffsetTop    = this.$element.offset().top - this.bleed;
     this.boxOffsetLeft   = this.$element.offset().left;
     this.boxOffsetBottom = this.boxOffsetTop + this.boxHeight;

     var winHeight = Parallax.winHeight;
     var docHeight = Parallax.docHeight;
     var maxOffset = Math.min(this.boxOffsetTop, docHeight - winHeight);
     var minOffset = Math.max(this.boxOffsetTop + this.boxHeight - winHeight, 0);
     var imageHeightMin = this.boxHeight + (maxOffset - minOffset) * (1 - this.speed) | 0;
     var imageOffsetMin = (this.boxOffsetTop - maxOffset) * (1 - this.speed) | 0;

     if (imageHeightMin * this.aspectRatio >= this.boxWidth) {
       this.imageWidth    = imageHeightMin * this.aspectRatio | 0;
       this.imageHeight   = imageHeightMin;
       this.offsetBaseTop = imageOffsetMin;

       var margin = this.imageWidth - this.boxWidth;

       if (this.positionX == 'left') {
         this.offsetLeft = 0;
       } else if (this.positionX == 'right') {
         this.offsetLeft = - margin;
       } else if (!isNaN(this.positionX)) {
         this.offsetLeft = Math.max(this.positionX, - margin);
       } else {
         this.offsetLeft = - margin / 2 | 0;
       }
     } else {
       this.imageWidth    = this.boxWidth;
       this.imageHeight   = this.boxWidth / this.aspectRatio | 0;
       this.offsetLeft    = 0;

       var margin = this.imageHeight - imageHeightMin;

       if (this.positionY == 'top') {
         this.offsetBaseTop = imageOffsetMin;
       } else if (this.positionY == 'bottom') {
         this.offsetBaseTop = imageOffsetMin - margin;
       } else if (!isNaN(this.positionY)) {
         this.offsetBaseTop = imageOffsetMin + Math.max(this.positionY, - margin);
       } else {
         this.offsetBaseTop = imageOffsetMin - margin / 2 | 0;
       }
     }
   },

   render: function() {
     var scrollTop    = Parallax.scrollTop;
     var scrollLeft   = Parallax.scrollLeft;
     var overScroll   = this.overScrollFix ? Parallax.overScroll : 0;
     var scrollBottom = scrollTop + Parallax.winHeight;

     if (this.boxOffsetBottom > scrollTop && this.boxOffsetTop < scrollBottom) {
       this.visibility = 'visible';
     } else {
       this.visibility = 'hidden';
     }
     this.mirrorTop = this.boxOffsetTop  - scrollTop;
     this.mirrorLeft = this.boxOffsetLeft - scrollLeft;
     this.offsetTop = this.offsetBaseTop - this.mirrorTop * (1 - this.speed);

     this.$mirror.css({
       transform: 'translate3d(0px, 0px, 0px)',
       visibility: this.visibility,
       top: this.mirrorTop - overScroll,
       left: this.mirrorLeft,
       height: this.boxHeight,
       width: this.boxWidth
     });

     this.$slider.css({
       transform: 'translate3d(0px, 0px, 0px)',
       position: 'absolute',
       top: this.offsetTop,
       left: this.offsetLeft,
       height: this.imageHeight,
       width: this.imageWidth,
       maxWidth: 'none'
     });
   }
 });

 // Parallax Static Methods

 $.extend(Parallax, {
   scrollTop:    0,
   scrollLeft:   0,
   winHeight:    0,
   winWidth:     0,
   docHeight:    1 << 30,
   docWidth:     1 << 30,
   sliders:      [],
   isReady:      false,
   isFresh:      false,
   isBusy:       false,

   setup: function() {
     if (this.isReady) return;

     var $doc = $(document), $win = $(window);

     $win.on('scroll.px.parallax load.px.parallax', function() {
         var scrollTopMax  = Parallax.docHeight - Parallax.winHeight;
         var scrollLeftMax = Parallax.docWidth  - Parallax.winWidth;
         Parallax.scrollTop  = Math.max(0, Math.min(scrollTopMax,  $win.scrollTop()));
         Parallax.scrollLeft = Math.max(0, Math.min(scrollLeftMax, $win.scrollLeft()));
         Parallax.overScroll = Math.max($win.scrollTop() - scrollTopMax, Math.min($win.scrollTop(), 0));
         Parallax.requestRender();
       })
       .on('resize.px.parallax load.px.parallax', function() {
         Parallax.winHeight = $win.height();
         Parallax.winWidth  = $win.width();
         Parallax.docHeight = $doc.height();
         Parallax.docWidth  = $doc.width();
         Parallax.isFresh = false;
         Parallax.requestRender();
       });

     this.isReady = true;
   },

   configure: function(options) {
     if (typeof options == 'object') {
       delete options.refresh;
       delete options.render;
       $.extend(this.prototype, options);
     }
   },

   refresh: function() {
     $.each(this.sliders, function(){ this.refresh() });
     this.isFresh = true;
   },

   render: function() {
     this.isFresh || this.refresh();
     $.each(this.sliders, function(){ this.render() });
   },

   requestRender: function() {
     var self = this;

     if (!this.isBusy) {
       this.isBusy = true;
       window.requestAnimationFrame(function() {
         self.render();
         self.isBusy = false;
       });
     }
   }
 });

 // Parallax Plugin Definition

 function Plugin(option) {
   return this.each(function () {
     var $this = $(this);
     var options = typeof option == 'object' && option;

     if (this == window || this == document || $this.is('body')) {
       Parallax.configure(options);
     }
     else if (!$this.data('px.parallax')) {
       options = $.extend({}, $this.data(), options);
       $this.data('px.parallax', new Parallax(this, options));
     }
     if (typeof option == 'string') {
       Parallax[option]();
     }
   })
 };

 var old = $.fn.parallax;

 $.fn.parallax             = Plugin;
 $.fn.parallax.Constructor = Parallax;

 // Parallax No Conflict

 $.fn.parallax.noConflict = function () {
   $.fn.parallax = old;
   return this;
 };

 // Parallax Data-API

 $(document).on('ready.px.parallax.data-api', function () {
   $('[data-parallax="scroll"]').parallax();
 });

}(jQuery, window, document));