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Filename : jquery.stellar.min.js
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/*! Stellar.js v0.6.2 | Copyright 2013, Mark Dalgleish | http://markdalgleish.com/projects/stellar.js | http://markdalgleish.mit-license.org */
(function(e,t,n,r){function d(t,n){this.element=t,this.options=e.extend({},s,n),this._defaults=s,this._name=i,this.init()}var i="stellar",s={scrollProperty:"scroll",positionProperty:"position",horizontalScrolling:!0,verticalScrolling:!0,horizontalOffset:0,verticalOffset:0,responsive:!1,parallaxBackgrounds:!0,parallaxElements:!0,hideDistantElements:!0,hideElement:function(e){e.hide()},showElement:function(e){e.show()}},o={scroll:{getLeft:function(e){return e.scrollLeft()},setLeft:function(e,t){e.scrollLeft(t)},getTop:function(e){return e.scrollTop()},setTop:function(e,t){e.scrollTop(t)}},position:{getLeft:function(e){return parseInt(e.css("left"),10)*-1},getTop:function(e){return parseInt(e.css("top"),10)*-1}},margin:{getLeft:function(e){return parseInt(e.css("margin-left"),10)*-1},getTop:function(e){return parseInt(e.css("margin-top"),10)*-1}},transform:{getLeft:function(e){var t=getComputedStyle(e[0])[f];return t!=="none"?parseInt(t.match(/(-?[0-9]+)/g)[4],10)*-1:0},getTop:function(e){var t=getComputedStyle(e[0])[f];return t!=="none"?parseInt(t.match(/(-?[0-9]+)/g)[5],10)*-1:0}}},u={position:{setLeft:function(e,t){e.css("left",t)},setTop:function(e,t){e.css("top",t)}},transform:{setPosition:function(e,t,n,r,i){e[0].style[f]="translate3d("+(t-n)+"px, "+(r-i)+"px, 0)"}}},a=function(){var t=/^(Moz|Webkit|Khtml|O|ms|Icab)(?=[A-Z])/,n=e("script")[0].style,r="",i;for(i in n)if(t.test(i)){r=i.match(t)[0];break}return"WebkitOpacity"in n&&(r="Webkit"),"KhtmlOpacity"in n&&(r="Khtml"),function(e){return r+(r.length>0?e.charAt(0).toUpperCase()+e.slice(1):e)}}(),f=a("transform"),l=e("<div />",{style:"background:#fff"}).css("background-position-x")!==r,c=l?function(e,t,n){e.css({"background-position-x":t,"background-position-y":n})}:function(e,t,n){e.css("background-position",t+" "+n)},h=l?function(e){return[e.css("background-position-x"),e.css("background-position-y")]}:function(e){return e.css("background-position").split(" ")},p=t.requestAnimationFrame||t.webkitRequestAnimationFrame||t.mozRequestAnimationFrame||t.oRequestAnimationFrame||t.msRequestAnimationFrame||function(e){setTimeout(e,1e3/60)};d.prototype={init:function(){this.options.name=i+"_"+Math.floor(Math.random()*1e9),this._defineElements(),this._defineGetters(),this._defineSetters(),this._handleWindowLoadAndResize(),this._detectViewport(),this.refresh({firstLoad:!0}),this.options.scrollProperty==="scroll"?this._handleScrollEvent():this._startAnimationLoop()},_defineElements:function(){this.element===n.body&&(this.element=t),this.$scrollElement=e(this.element),this.$element=this.element===t?e("body"):this.$scrollElement,this.$viewportElement=this.options.viewportElement!==r?e(this.options.viewportElement):this.$scrollElement[0]===t||this.options.scrollProperty==="scroll"?this.$scrollElement:this.$scrollElement.parent()},_defineGetters:function(){var e=this,t=o[e.options.scrollProperty];this._getScrollLeft=function(){return t.getLeft(e.$scrollElement)},this._getScrollTop=function(){return t.getTop(e.$scrollElement)}},_defineSetters:function(){var t=this,n=o[t.options.scrollProperty],r=u[t.options.positionProperty],i=n.setLeft,s=n.setTop;this._setScrollLeft=typeof i=="function"?function(e){i(t.$scrollElement,e)}:e.noop,this._setScrollTop=typeof s=="function"?function(e){s(t.$scrollElement,e)}:e.noop,this._setPosition=r.setPosition||function(e,n,i,s,o){t.options.horizontalScrolling&&r.setLeft(e,n,i),t.options.verticalScrolling&&r.setTop(e,s,o)}},_handleWindowLoadAndResize:function(){var n=this,r=e(t);n.options.responsive&&r.bind("load."+this.name,function(){n.refresh()}),r.bind("resize."+this.name,function(){n._detectViewport(),n.options.responsive&&n.refresh()})},refresh:function(n){var r=this,i=r._getScrollLeft(),s=r._getScrollTop();(!n||!n.firstLoad)&&this._reset(),this._setScrollLeft(0),this._setScrollTop(0),this._setOffsets(),this._findParticles(),this._findBackgrounds(),n&&n.firstLoad&&/WebKit/.test(navigator.userAgent)&&e(t).load(function(){var e=r._getScrollLeft(),t=r._getScrollTop();r._setScrollLeft(e+1),r._setScrollTop(t+1),r._setScrollLeft(e),r._setScrollTop(t)}),this._setScrollLeft(i),this._setScrollTop(s)},_detectViewport:function(){var e=this.$viewportElement.offset(),t=e!==null&&e!==r;this.viewportWidth=this.$viewportElement.width(),this.viewportHeight=this.$viewportElement.height(),this.viewportOffsetTop=t?e.top:0,this.viewportOffsetLeft=t?e.left:0},_findParticles:function(){var t=this,n=this._getScrollLeft(),i=this._getScrollTop();if(this.particles!==r)for(var s=this.particles.length-1;s>=0;s--)this.particles[s].$element.data("stellar-elementIsActive",r);this.particles=[];if(!this.options.parallaxElements)return;this.$element.find("[data-stellar-ratio]").each(function(n){var i=e(this),s,o,u,a,f,l,c,h,p,d=0,v=0,m=0,g=0;if(!i.data("stellar-elementIsActive"))i.data("stellar-elementIsActive",this);else if(i.data("stellar-elementIsActive")!==this)return;t.options.showElement(i),i.data("stellar-startingLeft")?(i.css("left",i.data("stellar-startingLeft")),i.css("top",i.data("stellar-startingTop"))):(i.data("stellar-startingLeft",i.css("left")),i.data("stellar-startingTop",i.css("top"))),u=i.position().left,a=i.position().top,f=i.css("margin-left")==="auto"?0:parseInt(i.css("margin-left"),10),l=i.css("margin-top")==="auto"?0:parseInt(i.css("margin-top"),10),h=i.offset().left-f,p=i.offset().top-l,i.parents().each(function(){var t=e(this);if(t.data("stellar-offset-parent")===!0)return d=m,v=g,c=t,!1;m+=t.position().left,g+=t.position().top}),s=i.data("stellar-horizontal-offset")!==r?i.data("stellar-horizontal-offset"):c!==r&&c.data("stellar-horizontal-offset")!==r?c.data("stellar-horizontal-offset"):t.horizontalOffset,o=i.data("stellar-vertical-offset")!==r?i.data("stellar-vertical-offset"):c!==r&&c.data("stellar-vertical-offset")!==r?c.data("stellar-vertical-offset"):t.verticalOffset,t.particles.push({$element:i,$offsetParent:c,isFixed:i.css("position")==="fixed",horizontalOffset:s,verticalOffset:o,startingPositionLeft:u,startingPositionTop:a,startingOffsetLeft:h,startingOffsetTop:p,parentOffsetLeft:d,parentOffsetTop:v,stellarRatio:i.data("stellar-ratio")!==r?i.data("stellar-ratio"):1,width:i.outerWidth(!0),height:i.outerHeight(!0),isHidden:!1})})},_findBackgrounds:function(){var t=this,n=this._getScrollLeft(),i=this._getScrollTop(),s;this.backgrounds=[];if(!this.options.parallaxBackgrounds)return;s=this.$element.find("[data-stellar-background-ratio]"),this.$element.data("stellar-background-ratio")&&(s=s.add(this.$element)),s.each(function(){var s=e(this),o=h(s),u,a,f,l,p,d,v,m,g,y=0,b=0,w=0,E=0;if(!s.data("stellar-backgroundIsActive"))s.data("stellar-backgroundIsActive",this);else if(s.data("stellar-backgroundIsActive")!==this)return;s.data("stellar-backgroundStartingLeft")?c(s,s.data("stellar-backgroundStartingLeft"),s.data("stellar-backgroundStartingTop")):(s.data("stellar-backgroundStartingLeft",o[0]),s.data("stellar-backgroundStartingTop",o[1])),p=s.css("margin-left")==="auto"?0:parseInt(s.css("margin-left"),10),d=s.css("margin-top")==="auto"?0:parseInt(s.css("margin-top"),10),v=s.offset().left-p-n,m=s.offset().top-d-i,s.parents().each(function(){var t=e(this);if(t.data("stellar-offset-parent")===!0)return y=w,b=E,g=t,!1;w+=t.position().left,E+=t.position().top}),u=s.data("stellar-horizontal-offset")!==r?s.data("stellar-horizontal-offset"):g!==r&&g.data("stellar-horizontal-offset")!==r?g.data("stellar-horizontal-offset"):t.horizontalOffset,a=s.data("stellar-vertical-offset")!==r?s.data("stellar-vertical-offset"):g!==r&&g.data("stellar-vertical-offset")!==r?g.data("stellar-vertical-offset"):t.verticalOffset,t.backgrounds.push({$element:s,$offsetParent:g,isFixed:s.css("background-attachment")==="fixed",horizontalOffset:u,verticalOffset:a,startingValueLeft:o[0],startingValueTop:o[1],startingBackgroundPositionLeft:isNaN(parseInt(o[0],10))?0:parseInt(o[0],10),startingBackgroundPositionTop:isNaN(parseInt(o[1],10))?0:parseInt(o[1],10),startingPositionLeft:s.position().left,startingPositionTop:s.position().top,startingOffsetLeft:v,startingOffsetTop:m,parentOffsetLeft:y,parentOffsetTop:b,stellarRatio:s.data("stellar-background-ratio")===r?1:s.data("stellar-background-ratio")})})},_reset:function(){var e,t,n,r,i;for(i=this.particles.length-1;i>=0;i--)e=this.particles[i],t=e.$element.data("stellar-startingLeft"),n=e.$element.data("stellar-startingTop"),this._setPosition(e.$element,t,t,n,n),this.options.showElement(e.$element),e.$element.data("stellar-startingLeft",null).data("stellar-elementIsActive",null).data("stellar-backgroundIsActive",null);for(i=this.backgrounds.length-1;i>=0;i--)r=this.backgrounds[i],r.$element.data("stellar-backgroundStartingLeft",null).data("stellar-backgroundStartingTop",null),c(r.$element,r.startingValueLeft,r.startingValueTop)},destroy:function(){this._reset(),this.$scrollElement.unbind("resize."+this.name).unbind("scroll."+this.name),this._animationLoop=e.noop,e(t).unbind("load."+this.name).unbind("resize."+this.name)},_setOffsets:function(){var n=this,r=e(t);r.unbind("resize.horizontal-"+this.name).unbind("resize.vertical-"+this.name),typeof this.options.horizontalOffset=="function"?(this.horizontalOffset=this.options.horizontalOffset(),r.bind("resize.horizontal-"+this.name,function(){n.horizontalOffset=n.options.horizontalOffset()})):this.horizontalOffset=this.options.horizontalOffset,typeof this.options.verticalOffset=="function"?(this.verticalOffset=this.options.verticalOffset(),r.bind("resize.vertical-"+this.name,function(){n.verticalOffset=n.options.verticalOffset()})):this.verticalOffset=this.options.verticalOffset},_repositionElements:function(){var e=this._getScrollLeft(),t=this._getScrollTop(),n,r,i,s,o,u,a,f=!0,l=!0,h,p,d,v,m;if(this.currentScrollLeft===e&&this.currentScrollTop===t&&this.currentWidth===this.viewportWidth&&this.currentHeight===this.viewportHeight)return;this.currentScrollLeft=e,this.currentScrollTop=t,this.currentWidth=this.viewportWidth,this.currentHeight=this.viewportHeight;for(m=this.particles.length-1;m>=0;m--)i=this.particles[m],s=i.isFixed?1:0,this.options.horizontalScrolling?(h=(e+i.horizontalOffset+this.viewportOffsetLeft+i.startingPositionLeft-i.startingOffsetLeft+i.parentOffsetLeft)*-(i.stellarRatio+s-1)+i.startingPositionLeft,d=h-i.startingPositionLeft+i.startingOffsetLeft):(h=i.startingPositionLeft,d=i.startingOffsetLeft),this.options.verticalScrolling?(p=(t+i.verticalOffset+this.viewportOffsetTop+i.startingPositionTop-i.startingOffsetTop+i.parentOffsetTop)*-(i.stellarRatio+s-1)+i.startingPositionTop,v=p-i.startingPositionTop+i.startingOffsetTop):(p=i.startingPositionTop,v=i.startingOffsetTop),this.options.hideDistantElements&&(l=!this.options.horizontalScrolling||d+i.width>(i.isFixed?0:e)&&d<(i.isFixed?0:e)+this.viewportWidth+this.viewportOffsetLeft,f=!this.options.verticalScrolling||v+i.height>(i.isFixed?0:t)&&v<(i.isFixed?0:t)+this.viewportHeight+this.viewportOffsetTop),l&&f?(i.isHidden&&(this.options.showElement(i.$element),i.isHidden=!1),this._setPosition(i.$element,h,i.startingPositionLeft,p,i.startingPositionTop)):i.isHidden||(this.options.hideElement(i.$element),i.isHidden=!0);for(m=this.backgrounds.length-1;m>=0;m--)o=this.backgrounds[m],s=o.isFixed?0:1,u=this.options.horizontalScrolling?(e+o.horizontalOffset-this.viewportOffsetLeft-o.startingOffsetLeft+o.parentOffsetLeft-o.startingBackgroundPositionLeft)*(s-o.stellarRatio)+"px":o.startingValueLeft,a=this.options.verticalScrolling?(t+o.verticalOffset-this.viewportOffsetTop-o.startingOffsetTop+o.parentOffsetTop-o.startingBackgroundPositionTop)*(s-o.stellarRatio)+"px":o.startingValueTop,c(o.$element,u,a)},_handleScrollEvent:function(){var e=this,t=!1,n=function(){e._repositionElements(),t=!1},r=function(){t||(p(n),t=!0)};this.$scrollElement.bind("scroll."+this.name,r),r()},_startAnimationLoop:function(){var e=this;this._animationLoop=function(){p(e._animationLoop),e._repositionElements()},this._animationLoop()}},e.fn[i]=function(t){var n=arguments;if(t===r||typeof t=="object")return this.each(function(){e.data(this,"plugin_"+i)||e.data(this,"plugin_"+i,new d(this,t))});if(typeof t=="string"&&t[0]!=="_"&&t!=="init")return this.each(function(){var r=e.data(this,"plugin_"+i);r instanceof d&&typeof r[t]=="function"&&r[t].apply(r,Array.prototype.slice.call(n,1)),t==="destroy"&&e.data(this,"plugin_"+i,null)})},e[i]=function(n){var r=e(t);return r.stellar.apply(r,Array.prototype.slice.call(arguments,0))},e[i].scrollProperty=o,e[i].positionProperty=u,t.Stellar=d})(jQuery,this,document);