// Copyright (c) 2009 Felix Nagel for Namics (Deustchland) GmbH
// Licensed under Creative Commens Attribution-Share Alike 3.0 Unported (http://creativecommons.org/licenses/by-sa/3.0/)

(function($){$.widget("ui.ariaLightbox",{_init:function(){var options=this.options,self=this;if(options.imageArray){options.imageArray[options.imageArray.length]=this.element;var index=options.imageArray.length;this.element.click(function(event){self.options.activeImage=index-1;if(!options.disabled){event.preventDefault();self._open($(this),event);}});}else{self.element.click(function(event){if(!options.disabled){event.preventDefault();self._open($(this),event);}});}
if(options.useDimmer)
$(window).resize(function(){self._dimmerResize();});self._makeHover(self.element);},startGallery:function(event){var options=this.options,self=this;self._open($(options.imageArray[0]),event);},_open:function(element,event){var options=this.options,self=this;options.clickedElement=event.target;options.wrapperElement=$("#ui-lightbox-wrapper");if(!options.wrapperElement.length){self._show(element,event);}else{self._changePicture(element,event);}},_show:function(element,event){var options=this.options,self=this;var html="\n";html+='<div id="ui-lightbox-wrapper" style="z-index:'+options.zIndex+1+';" class="ui-dialog ui-widget ui-widget-content ui-corner-all" tabindex="-1" role="dialog" aria-labelledby="ui-dialog-titleText-dialog">'+"\n";html+=' <div class="ui-dialog-titlebar ui-widget-header ui-corner-all ui-helper-clearfix">'+"\n";html+='  <span class="ui-dialog-title" id="ui-dialog-title-dialog">'+options.titleText+'</span>'+"\n";html+='  <a href="#nogo" id="ui-lightbox-close" class="ui-dialog-titlebar-close ui-corner-all" title="'+options.closeText+'" role="button">'+"\n";html+='   <span class="ui-icon ui-icon-closethick">'+options.closeText+'</span>'+"\n";html+='  </a>'+"\n";html+=' </div>'+"\n";html+=' <div id="ui-lightbox-content">'+"\n";html+='  <div id="ui-lightbox-image"><img src="" aria-describedby="ui-lightbox-description" /></div>'+"\n";html+='  <p id="ui-lightbox-description"></p>'+"\n";if(options.imageArray){html+='  <p id="ui-lightbox-pager"></p>'+"\n";html+='  <div id="ui-dialog-buttonpane" class="ui-dialog-buttonpane ui-widget-content ui-helper-clearfix">'+"\n";html+='   <button id="ui-lightbox-next" type="button" class="ui-state-default ui-corner-all">Next</button>'+"\n";html+='   <button id="ui-lightbox-prev" type="button" class="ui-state-default ui-corner-all">Previous</button>'+"\n";html+='  </div>'+"\n";}
html+=' </div> '+"\n";html+='</div>'+"\n";if(options.useDimmer)self._lightboxCreate();$("body").append(html);self._trigger("onShow",0);options.wrapperElement=$("#ui-lightbox-wrapper");if(options.imageArray){options.wrapperElement.keydown(function(event){if(event.keyCode==$.ui.keyCode.RIGHT)self.next();if(event.keyCode==$.ui.keyCode.DOWN)self.next();if(event.keyCode==$.ui.keyCode.UP)self.prev();if(event.keyCode==$.ui.keyCode.LEFT)self.prev();if(event.keyCode==$.ui.keyCode.SPACE)self.next();if(event.keyCode==$.ui.keyCode.END){options.activeImage=options.imageArray.length-2;event.preventDefault();self.next();}
if(event.keyCode==$.ui.keyCode.HOME){options.activeImage=1;event.preventDefault();self.prev();}});options.buttonpane=options.wrapperElement.find("#ui-dialog-buttonpane")
self._setButtonState();var prev=options.buttonpane.find("#ui-lightbox-prev");prev.click(function(){self.prev();});self._makeHover(prev);var next=options.buttonpane.find("#ui-lightbox-next");next.click(function(){self.next();});self._makeHover(next);}
options.wrapperElement.keydown(function(event){if(event.keyCode==$.ui.keyCode.ESCAPE)self.close();});var closeElement=options.wrapperElement.find("#ui-lightbox-close");closeElement.click(function(){self.close();});self._makeHover(closeElement);switch(options.pos){case"auto":var viewPos=self._pageScroll();var posLeft=(($(document).width()-options.wrapperElement.width())/2);var posTop=viewPos[1]+options.autoHeight;break;case"offset":var posLeft=event.pageX+options.offsetX;var posTop=event.pageY-options.offsetY;break;default:var position=options.pos.split(",");var posLeft=position[0];var posTop=position[1];break;}
options.wrapperElement.css({left:posLeft+"px",top:posTop+"px"}).fadeIn(options.animationSpeed).focus();self._changePicture(element,event);},_changePicture:function(element,event){var options=this.options,self=this;var contentWrapper=options.wrapperElement.find("#ui-lightbox-content");var imageWrapper=contentWrapper.find("#ui-lightbox-image");var imageElement=imageWrapper.find("img");imageElement.fadeOut(options.animationSpeed,function(){contentWrapper.attr("aria-live","assertive").attr("aria-relevant","additions removals text").attr("aria-busy",true);var image=new Image();image.onload=function(){imageElement.attr('src',element.attr("href")).attr('alt',element.find("img").attr(options.altText));var calculatedX=(options.em)?image.width*options.em+"em":image.width;var calculatedY=(options.em)?image.height*options.em+"em":image.height;imageElement.css({width:calculatedX,height:calculatedY});switch(options.pos){case"offset":options.wrapperElement.animate({left:event.pageX+options.offsetX+"px",top:event.pageY+options.offsetY+"px",width:calculatedX},options.animationSpeed);break;case"auto":options.wrapperElement.animate({left:(($(document).width()-image.width)/2)+"px",width:calculatedX},options.animationSpeed);break;}
imageWrapper.animate({height:calculatedY},options.animationSpeed,function(){imageElement.fadeIn(options.animationSpeed);var descText='';var img=element.find("img");if(img.length>0){descText=img.attr(options.descText);}else{descText=element.attr(options.descText);}
options.wrapperElement.find("#ui-lightbox-description").text(descText);if(options.imageArray)
options.wrapperElement.find("#ui-lightbox-pager").text(options.pictureText+' '+(options.activeImage+1)+' '+options.ofText+' '+options.imageArray.length);if(options.useDimmer)self._dimmerResize();self._updateVirtualBuffer();contentWrapper.attr("aria-busy",false);self._trigger("onChangePicture",0);});image.onload=function(){};};image.src=element.attr("href");});},_setButtonState:function(){var options=this.options;options.buttonpane.find("#ui-lightbox-next, #ui-lightbox-prev").removeAttr("disabled").removeClass("ui-state-disabled").removeClass("ui-state-focus");switch(options.activeImage){case 0:options.buttonpane.find("#ui-lightbox-prev").attr("disabled","disabled").removeClass("ui-state-hover").addClass("ui-state-disabled");options.buttonpane.find("#ui-lightbox-next").focus();break;case options.imageArray.length-1:options.buttonpane.find("#ui-lightbox-next").attr("disabled","disabled").removeClass("ui-state-hover").addClass("ui-state-disabled");options.buttonpane.find("#ui-lightbox-prev").focus();break;}},close:function(){var options=this.options,self=this;$(options.clickedElement).parent().focus();options.wrapperElement.fadeOut(options.animationSpeed,function(){$(this).remove();});if(options.useDimmer)$("#ui-lightbox-screendimmer").fadeOut(options.animationSpeed,function(){$(this).remove();});self._trigger("onClose",0);},prev:function(){var options=this.options,self=this;if(options.imageArray&&options.activeImage>0){options.activeImage=options.activeImage-1;self._changePicture($(options.imageArray[options.activeImage]));self._setButtonState();self._trigger("onPrev",0);}},next:function(){var options=this.options,self=this;if(options.imageArray&&options.activeImage<(options.imageArray.length-1)){options.activeImage=options.activeImage+1;self._changePicture($(options.imageArray[options.activeImage]));self._setButtonState();self._trigger("onNext",0);}},_lightboxCreate:function(){var options=this.options,self=this;var html='<div id="ui-lightbox-screendimmer" style="display: none;"></div>';$("body").append(html);$("#ui-lightbox-screendimmer").css({width:self._dimmerWidth(),height:self._dimmerHeight(),zIndex:options.zIndex,background:options.background,position:"absolute",top:"0px",left:"0px",opacity:options.opacity}).fadeIn(options.animationSpeed).click(function(){self.close();});},_dimmerResize:function(){var self=this;var dimmer=$("#ui-lightbox-screendimmer");dimmer.css({width:0,height:0});var dimension=self._pageScroll();var dimensionX=(dimension[0]==0)?self._dimmerWidth():dimension[0];dimmer.css({width:dimensionX,height:self._dimmerHeight()});},_dimmerHeight:function(){if($.browser.msie&&$.browser.version<7){var scrollHeight=Math.max(document.documentElement.scrollHeight,document.body.scrollHeight);var offsetHeight=Math.max(document.documentElement.offsetHeight,document.body.offsetHeight);if(scrollHeight<offsetHeight){return $(window).height()+'px';}else{return scrollHeight+'px';}}else{return $(document).height()+'px';}},_dimmerWidth:function(){if($.browser.msie&&$.browser.version<7){var scrollWidth=Math.max(document.documentElement.scrollWidth,document.body.scrollWidth);var offsetWidth=Math.max(document.documentElement.offsetWidth,document.body.offsetWidth);if(scrollWidth<offsetWidth){return $(window).width()+'px';}else{return scrollWidth+'px';}}else{return $(document).width()+'px';}},_pageScroll:function(){var xScroll,yScroll;if(self.pageYOffset){yScroll=self.pageYOffset;xScroll=self.pageXOffset;}else if(document.documentElement&&document.documentElement.scrollTop){yScroll=document.documentElement.scrollTop;xScroll=document.documentElement.scrollLeft;}else if(document.body){yScroll=document.body.scrollTop;xScroll=document.body.scrollLeft;}
arrayPageScroll=new Array(xScroll,yScroll);return arrayPageScroll;},_makeHover:function(element){element.bind("mouseenter",function(){$(this).addClass('ui-state-hover');}).bind("mouseleave",function(){$(this).removeClass('ui-state-hover');}).bind("focus",function(){$(this).addClass('ui-state-focus');}).bind("blur",function(){$(this).removeClass('ui-state-focus');});},_updateVirtualBuffer:function(){var form=$("#virtualBufferForm");if(form.length){(form.val()=="1")?form.val("0"):form.val("1")}else{var html='<form><input id="virtualBufferForm" type="hidden" value="1" /></form>';$("body").append(html);}},destroy:function(){var options=this.options;this.element.unbind(".ariaLightbox").unbind("click").removeData('ariaLightbox');$("#virtualBufferForm").parent().remove();$("#ui-lightbox-screendimmer").remove();$("#ui-lightbox-wrapper").unbind("keydown").remove();}});$.extend($.ui.ariaLightbox,{version:"1.7.1",defaults:{altText:"alt",descText:"title",prevText:"Previous",nextText:"Next",titleText:"Lightbox",pictureText:"Picture",ofText:"of",closeText:"Close [ESC]",pos:"auto",autoHeight:50,offsetX:10,offsetY:10,useDimmer:true,animationSpeed:"slow",zIndex:1000,background:"black",opacity:0.8,em:0.0568182,activeImage:0}});})(jQuery);