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Filename : jquery.stellar.min.js
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/*! Stellar.js v0.6.2 | Copyright 2014, Mark Dalgleish | http://markdalgleish.com/projects/stellar.js | http://markdalgleish.mit-license.org */
!function(a,b,c,d){function e(b,c){this.element=b,this.options=a.extend({},g,c),this._defaults=g,this._name=f,this.init()}var f="stellar",g={scrollProperty:"scroll",positionProperty:"position",horizontalScrolling:!0,verticalScrolling:!0,horizontalOffset:0,verticalOffset:0,responsive:!1,parallaxBackgrounds:!0,parallaxElements:!0,hideDistantElements:!0,hideElement:function(a){a.hide()},showElement:function(a){a.show()}},h={scroll:{getLeft:function(a){return a.scrollLeft()},setLeft:function(a,b){a.scrollLeft(b)},getTop:function(a){return a.scrollTop()},setTop:function(a,b){a.scrollTop(b)}},position:{getLeft:function(a){return-1*parseInt(a.css("left"),10)},getTop:function(a){return-1*parseInt(a.css("top"),10)}},margin:{getLeft:function(a){return-1*parseInt(a.css("margin-left"),10)},getTop:function(a){return-1*parseInt(a.css("margin-top"),10)}},transform:{getLeft:function(a){var b=getComputedStyle(a[0])[k];return"none"!==b?-1*parseInt(b.match(/(-?[0-9]+)/g)[4],10):0},getTop:function(a){var b=getComputedStyle(a[0])[k];return"none"!==b?-1*parseInt(b.match(/(-?[0-9]+)/g)[5],10):0}}},i={position:{setLeft:function(a,b){a.css("left",b)},setTop:function(a,b){a.css("top",b)}},transform:{setPosition:function(a,b,c,d,e){a[0].style[k]="translate3d("+(b-c)+"px, "+(d-e)+"px, 0)"}}},j=function(){var b,c=/^(Moz|Webkit|Khtml|O|ms|Icab)(?=[A-Z])/,d=a("script")[0].style,e="";for(b in d)if(c.test(b)){e=b.match(c)[0];break}return"WebkitOpacity"in d&&(e="Webkit"),"KhtmlOpacity"in d&&(e="Khtml"),function(a){return e+(e.length>0?a.charAt(0).toUpperCase()+a.slice(1):a)}}(),k=j("transform"),l=a("<div />",{style:"background:#fff"}).css("background-position-x")!==d,m=l?function(a,b,c){a.css({"background-position-x":b,"background-position-y":c})}:function(a,b,c){a.css("background-position",b+" "+c)},n=l?function(a){return[a.css("background-position-x"),a.css("background-position-y")]}:function(a){return a.css("background-position").split(" ")},o=b.requestAnimationFrame||b.webkitRequestAnimationFrame||b.mozRequestAnimationFrame||b.oRequestAnimationFrame||b.msRequestAnimationFrame||function(a){setTimeout(a,1e3/60)};e.prototype={init:function(){this.options.name=f+"_"+Math.floor(1e9*Math.random()),this._defineElements(),this._defineGetters(),this._defineSetters(),this._handleWindowLoadAndResize(),this._detectViewport(),this.refresh({firstLoad:!0}),"scroll"===this.options.scrollProperty?this._handleScrollEvent():this._startAnimationLoop()},_defineElements:function(){this.element===c.body&&(this.element=b),this.$scrollElement=a(this.element),this.$element=this.element===b?a("body"):this.$scrollElement,this.$viewportElement=this.options.viewportElement!==d?a(this.options.viewportElement):this.$scrollElement[0]===b||"scroll"===this.options.scrollProperty?this.$scrollElement:this.$scrollElement.parent()},_defineGetters:function(){var a=this,b=h[a.options.scrollProperty];this._getScrollLeft=function(){return b.getLeft(a.$scrollElement)},this._getScrollTop=function(){return b.getTop(a.$scrollElement)}},_defineSetters:function(){var b=this,c=h[b.options.scrollProperty],d=i[b.options.positionProperty],e=c.setLeft,f=c.setTop;this._setScrollLeft="function"==typeof e?function(a){e(b.$scrollElement,a)}:a.noop,this._setScrollTop="function"==typeof f?function(a){f(b.$scrollElement,a)}:a.noop,this._setPosition=d.setPosition||function(a,c,e,f,g){b.options.horizontalScrolling&&d.setLeft(a,c,e),b.options.verticalScrolling&&d.setTop(a,f,g)}},_handleWindowLoadAndResize:function(){var c=this,d=a(b);c.options.responsive&&d.bind("load."+this.name,function(){c.refresh()}),d.bind("resize."+this.name,function(){c._detectViewport(),c.options.responsive&&c.refresh()})},refresh:function(c){var d=this,e=d._getScrollLeft(),f=d._getScrollTop();c&&c.firstLoad||this._reset(),this._setScrollLeft(0),this._setScrollTop(0),this._setOffsets(),this._findParticles(),this._findBackgrounds(),c&&c.firstLoad&&/WebKit/.test(navigator.userAgent)&&a(b).load(function(){var a=d._getScrollLeft(),b=d._getScrollTop();d._setScrollLeft(a+1),d._setScrollTop(b+1),d._setScrollLeft(a),d._setScrollTop(b)}),this._setScrollLeft(e),this._setScrollTop(f)},_detectViewport:function(){var a=this.$viewportElement.offset(),b=null!==a&&a!==d;this.viewportWidth=this.$viewportElement.width(),this.viewportHeight=this.$viewportElement.height(),this.viewportOffsetTop=b?a.top:0,this.viewportOffsetLeft=b?a.left:0},_findParticles:function(){{var b=this;this._getScrollLeft(),this._getScrollTop()}if(this.particles!==d)for(var c=this.particles.length-1;c>=0;c--)this.particles[c].$element.data("stellar-elementIsActive",d);this.particles=[],this.options.parallaxElements&&this.$element.find("[data-stellar-ratio]").each(function(){var c,e,f,g,h,i,j,k,l,m=a(this),n=0,o=0,p=0,q=0;if(m.data("stellar-elementIsActive")){if(m.data("stellar-elementIsActive")!==this)return}else m.data("stellar-elementIsActive",this);b.options.showElement(m),m.data("stellar-startingLeft")?(m.css("left",m.data("stellar-startingLeft")),m.css("top",m.data("stellar-startingTop"))):(m.data("stellar-startingLeft",m.css("left")),m.data("stellar-startingTop",m.css("top"))),f=m.position().left,g=m.position().top,h="auto"===m.css("margin-left")?0:parseInt(m.css("margin-left"),10),i="auto"===m.css("margin-top")?0:parseInt(m.css("margin-top"),10),k=m.offset().left-h,l=m.offset().top-i,m.parents().each(function(){var b=a(this);return b.data("stellar-offset-parent")===!0?(n=p,o=q,j=b,!1):(p+=b.position().left,void(q+=b.position().top))}),c=m.data("stellar-horizontal-offset")!==d?m.data("stellar-horizontal-offset"):j!==d&&j.data("stellar-horizontal-offset")!==d?j.data("stellar-horizontal-offset"):b.horizontalOffset,e=m.data("stellar-vertical-offset")!==d?m.data("stellar-vertical-offset"):j!==d&&j.data("stellar-vertical-offset")!==d?j.data("stellar-vertical-offset"):b.verticalOffset,b.particles.push({$element:m,$offsetParent:j,isFixed:"fixed"===m.css("position"),horizontalOffset:c,verticalOffset:e,startingPositionLeft:f,startingPositionTop:g,startingOffsetLeft:k,startingOffsetTop:l,parentOffsetLeft:n,parentOffsetTop:o,stellarRatio:m.data("stellar-ratio")!==d?m.data("stellar-ratio"):1,width:m.outerWidth(!0),height:m.outerHeight(!0),isHidden:!1})})},_findBackgrounds:function(){var b,c=this,e=this._getScrollLeft(),f=this._getScrollTop();this.backgrounds=[],this.options.parallaxBackgrounds&&(b=this.$element.find("[data-stellar-background-ratio]"),this.$element.data("stellar-background-ratio")&&(b=b.add(this.$element)),b.each(function(){var b,g,h,i,j,k,l,o=a(this),p=n(o),q=0,r=0,s=0,t=0;if(o.data("stellar-backgroundIsActive")){if(o.data("stellar-backgroundIsActive")!==this)return}else o.data("stellar-backgroundIsActive",this);o.data("stellar-backgroundStartingLeft")?m(o,o.data("stellar-backgroundStartingLeft"),o.data("stellar-backgroundStartingTop")):(o.data("stellar-backgroundStartingLeft",p[0]),o.data("stellar-backgroundStartingTop",p[1])),h="auto"===o.css("margin-left")?0:parseInt(o.css("margin-left"),10),i="auto"===o.css("margin-top")?0:parseInt(o.css("margin-top"),10),j=o.offset().left-h-e,k=o.offset().top-i-f,o.parents().each(function(){var b=a(this);return b.data("stellar-offset-parent")===!0?(q=s,r=t,l=b,!1):(s+=b.position().left,void(t+=b.position().top))}),b=o.data("stellar-horizontal-offset")!==d?o.data("stellar-horizontal-offset"):l!==d&&l.data("stellar-horizontal-offset")!==d?l.data("stellar-horizontal-offset"):c.horizontalOffset,g=o.data("stellar-vertical-offset")!==d?o.data("stellar-vertical-offset"):l!==d&&l.data("stellar-vertical-offset")!==d?l.data("stellar-vertical-offset"):c.verticalOffset,c.backgrounds.push({$element:o,$offsetParent:l,isFixed:"fixed"===o.css("background-attachment"),horizontalOffset:b,verticalOffset:g,startingValueLeft:p[0],startingValueTop:p[1],startingBackgroundPositionLeft:isNaN(parseInt(p[0],10))?0:parseInt(p[0],10),startingBackgroundPositionTop:isNaN(parseInt(p[1],10))?0:parseInt(p[1],10),startingPositionLeft:o.position().left,startingPositionTop:o.position().top,startingOffsetLeft:j,startingOffsetTop:k,parentOffsetLeft:q,parentOffsetTop:r,stellarRatio:o.data("stellar-background-ratio")===d?1:o.data("stellar-background-ratio")})}))},_reset:function(){var a,b,c,d,e;for(e=this.particles.length-1;e>=0;e--)a=this.particles[e],b=a.$element.data("stellar-startingLeft"),c=a.$element.data("stellar-startingTop"),this._setPosition(a.$element,b,b,c,c),this.options.showElement(a.$element),a.$element.data("stellar-startingLeft",null).data("stellar-elementIsActive",null).data("stellar-backgroundIsActive",null);for(e=this.backgrounds.length-1;e>=0;e--)d=this.backgrounds[e],d.$element.data("stellar-backgroundStartingLeft",null).data("stellar-backgroundStartingTop",null),m(d.$element,d.startingValueLeft,d.startingValueTop)},destroy:function(){this._reset(),this.$scrollElement.unbind("resize."+this.name).unbind("scroll."+this.name),this._animationLoop=a.noop,a(b).unbind("load."+this.name).unbind("resize."+this.name)},_setOffsets:function(){var c=this,d=a(b);d.unbind("resize.horizontal-"+this.name).unbind("resize.vertical-"+this.name),"function"==typeof this.options.horizontalOffset?(this.horizontalOffset=this.options.horizontalOffset(),d.bind("resize.horizontal-"+this.name,function(){c.horizontalOffset=c.options.horizontalOffset()})):this.horizontalOffset=this.options.horizontalOffset,"function"==typeof this.options.verticalOffset?(this.verticalOffset=this.options.verticalOffset(),d.bind("resize.vertical-"+this.name,function(){c.verticalOffset=c.options.verticalOffset()})):this.verticalOffset=this.options.verticalOffset},_repositionElements:function(){var a,b,c,d,e,f,g,h,i,j,k=this._getScrollLeft(),l=this._getScrollTop(),n=!0,o=!0;if(this.currentScrollLeft!==k||this.currentScrollTop!==l||this.currentWidth!==this.viewportWidth||this.currentHeight!==this.viewportHeight){for(this.currentScrollLeft=k,this.currentScrollTop=l,this.currentWidth=this.viewportWidth,this.currentHeight=this.viewportHeight,j=this.particles.length-1;j>=0;j--)a=this.particles[j],b=a.isFixed?1:0,this.options.horizontalScrolling?(f=(k+a.horizontalOffset+this.viewportOffsetLeft+a.startingPositionLeft-a.startingOffsetLeft+a.parentOffsetLeft)*-(a.stellarRatio+b-1)+a.startingPositionLeft,h=f-a.startingPositionLeft+a.startingOffsetLeft):(f=a.startingPositionLeft,h=a.startingOffsetLeft),this.options.verticalScrolling?(g=(l+a.verticalOffset+this.viewportOffsetTop+a.startingPositionTop-a.startingOffsetTop+a.parentOffsetTop)*-(a.stellarRatio+b-1)+a.startingPositionTop,i=g-a.startingPositionTop+a.startingOffsetTop):(g=a.startingPositionTop,i=a.startingOffsetTop),this.options.hideDistantElements&&(o=!this.options.horizontalScrolling||h+a.width>(a.isFixed?0:k)&&h<(a.isFixed?0:k)+this.viewportWidth+this.viewportOffsetLeft,n=!this.options.verticalScrolling||i+a.height>(a.isFixed?0:l)&&i<(a.isFixed?0:l)+this.viewportHeight+this.viewportOffsetTop),o&&n?(a.isHidden&&(this.options.showElement(a.$element),a.isHidden=!1),this._setPosition(a.$element,f,a.startingPositionLeft,g,a.startingPositionTop)):a.isHidden||(this.options.hideElement(a.$element),a.isHidden=!0);for(j=this.backgrounds.length-1;j>=0;j--)c=this.backgrounds[j],b=c.isFixed?0:1,d=this.options.horizontalScrolling?(k+c.horizontalOffset-this.viewportOffsetLeft-c.startingOffsetLeft+c.parentOffsetLeft-c.startingBackgroundPositionLeft)*(b-c.stellarRatio)+"px":c.startingValueLeft,e=this.options.verticalScrolling?(l+c.verticalOffset-this.viewportOffsetTop-c.startingOffsetTop+c.parentOffsetTop-c.startingBackgroundPositionTop)*(b-c.stellarRatio)+"px":c.startingValueTop,m(c.$element,d,e)}},_handleScrollEvent:function(){var a=this,b=!1,c=function(){a._repositionElements(),b=!1},d=function(){b||(o(c),b=!0)};this.$scrollElement.bind("scroll."+this.name,d),d()},_startAnimationLoop:function(){var a=this;this._animationLoop=function(){o(a._animationLoop),a._repositionElements()},this._animationLoop()}},a.fn[f]=function(b){var c=arguments;return b===d||"object"==typeof b?this.each(function(){a.data(this,"plugin_"+f)||a.data(this,"plugin_"+f,new e(this,b))}):"string"==typeof b&&"_"!==b[0]&&"init"!==b?this.each(function(){var d=a.data(this,"plugin_"+f);d instanceof e&&"function"==typeof d[b]&&d[b].apply(d,Array.prototype.slice.call(c,1)),"destroy"===b&&a.data(this,"plugin_"+f,null)}):void 0},a[f]=function(){var c=a(b);return c.stellar.apply(c,Array.prototype.slice.call(arguments,0))},a[f].scrollProperty=h,a[f].positionProperty=i,b.Stellar=e}(jQuery,this,document);