/**
 * Backslider - Fullscreen Background Image Slider 
 * http://plugins.gravitysign.com/backslider
 * Copyright (c) 2013 Roman Yurchuk
 * Version 1.8.1
*/

(function($){Function.prototype.scope=function(c){var f=this;return function(){f.apply(c,Array.prototype.slice.call(arguments))}};function BackSlider(c,s){this.container=$(c);this.settings=s;if(this.container.find(".bs-slides").length==0){this.container.append('<ul class="bs-slides"></ul>')}if(this.settings.photoSource=="flickrfeed"){this.photoSourceFlickrFeed()}else{if(this.settings.photoSource=="flickrauth"){this.photoSourceFlickrAuth()}else{if(this.settings.photoSource=="picasa"){this.photoSourcePicasa()}else{this.init()}}}}BackSlider.prototype.init=function(){this.slides=this.container.find(".bs-slides > li");this.length=this.slides.length;if(this.settings.startRandom){this.index=Math.floor(Math.random()*(this.length-1))}else{this.index=this.settings.startSlide||0}this.container.prepend('<div class="bs-overlay"></div>');this.container.prepend('<div class="bs-controls"></div>');if(this.settings.preload){this.container.prepend('<div class="bs-preload"><div class="bs-preload-indicator"></div></div>')}this.preloadTimer=window.setInterval((function(){var n=this.slides.find("img").filter(function(){return !this.complete}).length;if(n==0){window.clearInterval(this.preloadTimer);if(this.settings.preload){var preload=this.container.find(".bs-preload");preload.delay(this.settings.preloadDelay).fadeTo(this.settings.preloadTime,0,(function(){this.container.find(".bs-controls").fadeIn("fast");preload.remove()}).scope(this))}else{this.container.find(".bs-controls").fadeIn("fast")}this.slides.find("img").each(function(){$(this).attr("data-width",this.width).attr("data-height",this.height)});this.imageScaleMode();this.centerImages();this.settings.slidesLoaded.scope(this.container.get(0))(this.length)}}).scope(this),200);this.slides.not(":eq("+this.index+")").hide();if(this.settings.effect=="slidefade"){var w=100+Math.abs(this.settings.slidefadeOffsetX)*100/this.container.width();var h=100+Math.abs(this.settings.slidefadeOffsetY)*100/this.container.height();this.slides.css({width:w.toFixed(3)+"%",height:h.toFixed(3)+"%"})}$(window).resize((function(){this.imageScaleMode();this.centerImages()}).scope(this));this.container.bind("backslider",(function(e,a,p){if(typeof this[a]=="function"){this[a].scope(this)(p)}e.stopPropagation()}).scope(this));this.settings.mode=this.modes.hasOwnProperty(this.settings.mode)?this.settings.mode:"timer";this.settings.effect=this.effects.hasOwnProperty(this.settings.effect)?this.settings.effect:"fade";this.modes[this.settings.mode].scope(this)()};BackSlider.prototype.modes={timer:function(){$('<a class="bs-timer" href="#bs"></a>').click((function(e){(this.timer)?this.pause():this.resume();e.preventDefault()}).scope(this)).appendTo(this.container.find(".bs-controls"));this.resume()},scroll:function(){var point=0,step=0;$('<div class="bs-scroll"></div>').appendTo(this.container.find(".bs-controls"));$(window).bind("resize",(function(){step=($(document).height()-$(window).height())/(this.length-1)}).scope(this)).trigger("resize");if(step>0){$(window).bind("scroll",(function(){point=Math.floor($(window).scrollTop()/step);if(this.index!=point){window.clearTimeout(this.timer);this.timer=window.setTimeout((function(){this.slides.stop(true,true);if(this.index!=point){this.skip(point)}}).scope(this),this.settings.scrollTimeout)}}).scope(this))}},controls:function(){$('<a class="bs-previous" href="#bs"></a>').click((function(e){this.previous();e.preventDefault()}).scope(this)).appendTo(this.container.find(".bs-controls"));$('<a class="bs-next" href="#bs"></a>').click((function(e){this.next();e.preventDefault()}).scope(this)).appendTo(this.container.find(".bs-controls"))},pagination:function(){for(var i=0;i<this.length;i++){(function(p){$('<a class="bs-pagination" href="#bs'+p+'"></a>').click((function(e){this.skip(p);e.preventDefault()}).scope(this)).appendTo(this.container.find(".bs-controls"))}).scope(this)(i)}this.skip(this.index);this.updateControls()},thumbnails:function(){var time=this.settings.thumbnailsTime;var opacity=this.settings.thumbnailsOpacity;var size=parseInt(this.settings.thumbnailsSize,10)+"px";for(var i=0;i<this.length;i++){(function(p){var img=this.slides.eq(p).find("img");var thumb=new Image();thumb.alt=img.attr("alt");$(thumb).bind("load",function(){$(this).css((thumb.width/thumb.height>1)?"height":"width",size);$(this).removeAttr("width").removeAttr("height")}).hover(function(){$(this).stop().fadeTo(time,1)},function(){if(!$(this).parent().hasClass("bs-active")){$(this).stop().fadeTo(time,opacity)}}).css("opacity",opacity);thumb.src=img.attr("src");$('<a class="bs-thumbnails" href="#bs'+p+'"></a>').css({width:size,height:size}).click((function(e){this.skip(p);e.preventDefault()}).scope(this)).append(thumb).appendTo(this.container.find(".bs-controls"))}).scope(this)(i)}this.skip(this.index);this.updateControls()}};BackSlider.prototype.effects={fade:function(c,n){this.settings.beforeSlide.scope(this.container.get(0))(this.index,this.length);c.stop().fadeOut(this.settings.effectTime/2,this.settings.effectEasing,(function(){n.stop().fadeIn(this.settings.effectTime/2,this.settings.effectEasing,(function(){this.settings.afterSlide.scope(this.container.get(0))(this.index,this.length)}).scope(this))}).scope(this))},crossfade:function(c,n){this.settings.beforeSlide.scope(this.container.get(0))(this.index,this.length);c.stop().fadeOut(this.settings.effectTime,this.settings.effectEasing);n.stop().fadeIn(this.settings.effectTime,this.settings.effectEasing,(function(){this.settings.afterSlide.scope(this.container.get(0))(this.index,this.length)}).scope(this))},slidefade:function(c,n){var s={left:this.settings.slidefadeOffsetX,top:this.settings.slidefadeOffsetY,x:0,y:0};if(this.settings.slidefadeOffsetX>0){s.x=-this.settings.slidefadeOffsetX;s.left=0}if(this.settings.slidefadeOffsetY>0){s.y=-this.settings.slidefadeOffsetY;s.top=0}this.settings.beforeSlide.scope(this.container.get(0))(this.index,this.length);c.css("z-index","").stop().fadeOut(this.settings.effectTime,this.settings.effectEasing);n.css($.extend({display:"block",opacity:0,"z-index":20},s)).stop().animate({opacity:1,top:s.y,left:s.x},this.settings.effectTime,this.settings.effectEasing,(function(){this.settings.afterSlide.scope(this.container.get(0))(this.index,this.length)}).scope(this))},slide:function(c,n){var coverslide=this.container.children(".bs-coverslide");if(!coverslide.length){coverslide=$('<div class="bs-coverslide"><img src="" alt="Cover Slide"></div>');coverslide.prependTo(this.container)}this.settings.beforeSlide.scope(this.container.get(0))(this.index,this.length);coverslide.find("img").attr("src",c.find("img").attr("src")).css({position:"relative",top:c.find("img").position().top,left:c.find("img").position().left,width:c.find("img").width(),height:c.find("img").height()});coverslide.css("width","100%").stop(true).animate({width:"0%"},this.settings.effectTime,this.settings.effectEasing,(function(){this.settings.afterSlide.scope(this.container.get(0))(this.index,this.length)}).scope(this));n.css("left",this.settings.slideOffset).show().stop(true,true).animate({left:"0px"},this.settings.effectTime,this.settings.effectEasing);c.hide()}};BackSlider.prototype.next=function(){this.slides.stop(true,true);this.effects[this.settings.effect].scope(this)(this.currentSlide(),this.nextSlide());this.updateControls();this.reset()};BackSlider.prototype.previous=function(){var p=this.index;this.slides.stop(true,true);this.effects[this.settings.effect].scope(this)(this.currentSlide(),this.previousSlide());this.updateControls();this.reset()};BackSlider.prototype.skip=function(n){if(this.index!=n){var p=this.index;this.slides.stop(true,true);this.effects[this.settings.effect].scope(this)(this.currentSlide(),this.positionSlide(n));this.updateControls();this.reset()}};BackSlider.prototype.pause=function(){if(this.settings.mode=="timer"){this.container.find(".bs-timer").stop().fadeTo("fast",0,function(){$(this).css("background-position","0px -80px").fadeTo("fast",1)});window.clearInterval(this.timer);this.timer=0}};BackSlider.prototype.resume=function(){if(this.settings.mode=="timer"){var t=this.container.find(".bs-timer");t.stop().fadeTo("fast",0,function(){$(this).css("background-position","-20px 0px").fadeTo("fast",1)});var n=0;this.timer=window.setInterval((function(){t.css("background-position","0px "+(-20*n)+"px");n=n+1;if(n==4){this.next();n=0}}).scope(this),this.settings.timerDelay/4)}};BackSlider.prototype.reset=function(){this.pause();this.resume()};BackSlider.prototype.currentSlide=function(){return this.slides.eq(this.index)};BackSlider.prototype.nextSlide=function(){this.index=(this.index<this.length-1)?this.index+1:0;return this.currentSlide()};BackSlider.prototype.previousSlide=function(){this.index=(this.index>0)?this.index-1:this.length-1;return this.currentSlide()};BackSlider.prototype.positionSlide=function(n){this.index=parseInt(n,10);return this.currentSlide()};BackSlider.prototype.updateControls=function(){if(this.settings.mode=="pagination"){this.container.find(".bs-pagination").removeClass("bs-active").eq(this.index).addClass("bs-active")}if(this.settings.mode=="thumbnails"){this.container.find(".bs-active").removeClass("bs-active").children("img").stop().fadeTo(this.settings.thumbnailsTime,this.settings.thumbnailsOpacity);this.container.find(".bs-thumbnails:eq("+this.index+")").addClass("bs-active").children("img").css("opacity",1)}};BackSlider.prototype.imageScaleMode=function(){var container_ratio=this.container.width()/this.container.height();this.slides.find("img").each(function(){if(this.height>0){var image_ratio=this.width/this.height;this.className=(container_ratio>image_ratio)?"bs-landscape":"bs-portrait"}else{this.className="bs-landscape"}})};BackSlider.prototype.centerImages=function(){if(this.settings.centerImages){var container=this.container;this.slides.find("img").each(function(){var img=$(this),offset=0;var ratio=img.data("width")/img.data("height");if(img.hasClass("bs-landscape")){offset=-(container.width()/ratio-container.height())/2;if(offset>0){offset=0}img.css({position:"relative",top:offset,left:0})}else{offset=-(container.height()*ratio-container.width())/2;if(offset>0){offset=0}img.css({position:"relative",top:0,left:offset})}})}};BackSlider.prototype.getPhotoRange=function(mixed){var regexp=/(\d+)-(\d+)/g,match;while(match=regexp.exec(mixed)){var seq="";for(var n=parseInt(match[1],10);n<=parseInt(match[2],10);n++){seq+=n+","}mixed=mixed.replace(match[0],seq.substr(0,seq.length-1))}return mixed};BackSlider.prototype.photoSourceFlickrFeed=function(){var base="http://api.flickr.com/services/feeds/photoset.gne";var query="";for(var key in this.settings.flickrFeedQuery){query+=key+"="+this.settings.flickrFeedQuery[key]+"&"}query+="lang=en-us&format=json&jsoncallback=?";$.getJSON(base,query,(function(json){var list="";var range=this.getPhotoRange(this.settings.photoRange);$.each(json.items,function(i,item){if(range===""||range.search(new RegExp("\\b"+i+"\\b"))!=-1){list+='<li><img src="'+item.media.m.replace("_m","_b")+'" alt="'+item.title.replace('"',"'")+'"></li>';list+="\r\n"}});this.container.find(".bs-slides").html(list);this.init()}).scope(this))};BackSlider.prototype.photoSourceFlickrAuth=function(){var base="http://api.flickr.com/services/rest/";var query="";for(var key in this.settings.flickrAuthQuery){query+=key+"="+this.settings.flickrAuthQuery[key]+"&"}query+="method=flickr.photosets.getPhotos&extras=url_o&format=json&jsoncallback=?";$.getJSON(base,query,(function(json){var list="";var range=this.getPhotoRange(this.settings.photoRange);$.each(json.photoset.photo,function(i,item){if(range===""||range.search(new RegExp("\\b"+i+"\\b"))!=-1){list+='<li><img src="'+item.url_o+'" alt="'+item.title.replace('"',"'")+'"></li>';list+="\r\n"}});this.container.find(".bs-slides").html(list);this.init()}).scope(this))};BackSlider.prototype.photoSourcePicasa=function(){var base="https://picasaweb.google.com/data/feed/base/user/"+this.settings.picasaQuery.user+"/albumid/"+this.settings.picasaQuery.album;var query="alt=json&kind=photo&hl=en_US&fields=entry(title,media:group(media:content))";$.getJSON(base,query,(function(json){var list="";var range=this.getPhotoRange(this.settings.photoRange);$.each(json.feed.entry,function(i,item){if(range===""||range.search(new RegExp("\\b"+i+"\\b"))!=-1){var t=item.title.$t.replace('"',"'");var s=item.media$group.media$content[0].url;list+='<li><img src="'+s+'" alt="'+t+'"></li>';list+="\r\n"}});this.container.find(".bs-slides").html(list);this.init()}).scope(this))};$.fn.backslider=function(s){var settings=$.extend(true,{mode:"controls",effect:"fade",effectTime:1500,effectEasing:"swing",slideOffset:50,slidefadeOffsetX:0,slidefadeOffsetY:-50,timerDelay:5000,scrollTimeout:200,preload:true,preloadTime:1000,preloadDelay:200,startSlide:0,startRandom:false,thumbnailsSize:"40px",thumbnailsOpacity:0.5,thumbnailsTime:500,centerImages:false,photoSource:"none",photoRange:"",flickrFeedQuery:{set:"00000000",nsid:"00000000@N00"},flickrAuthQuery:{api_key:"00000000",photoset_id:"00000000"},picasaQuery:{user:"username",album:"00000000"},beforeSlide:function(){},afterSlide:function(){},slidesLoaded:function(){}},s);if(this.length){this.data("backslider",new BackSlider(this,settings))}return this}})(jQuery);