var Lightbox={
init: function(options){
this.options=$extend({
resizeDuration: 400,
resizeTransition: false,
initialWidth: 250,
initialHeight: 250,
animateCaption: true,
showCounter: true
},options ||{})
this.anchors=[]
$each(document.links,function(el){
if(el.rel&&el.rel.test(/^lightbox/i)){
el.onclick=this.click.pass(el,this)
this.anchors.push(el)}
},this)
this.eventKeyDown=this.keyboardListener.bindAsEventListener(this)
this.eventPosition=this.position.bind(this)
this.overlay=new Element('div',{'id': 'lbOverlay'}).injectInside(document.body)
this.center=new Element('div',{'id': 'lbCenter','styles':{'width': this.options.initialWidth,'height': this.options.initialHeight,'marginLeft':-(this.options.initialWidth/2),'display': 'none'}}).injectInside(document.body)
this.image=new Element('div',{'id': 'lbImage'}).injectInside(this.center)
this.prevLink=new Element('a',{'id': 'lbPrevLink','href': '#','styles':{'display': 'none'}}).injectInside(this.image)
this.nextLink=this.prevLink.clone().setProperty('id','lbNextLink').injectInside(this.image)
this.prevLink.onclick=this.previous.bind(this)
this.nextLink.onclick=this.next.bind(this)
this.bottomContainer=new Element('div',{'id': 'lbBottomContainer','styles':{'display': 'none'}}).injectInside(document.body)
this.bottom=new Element('div',{'id': 'lbBottom'}).injectInside(this.bottomContainer)
new Element('a',{'id': 'lbCloseLink','href': '#'}).injectInside(this.bottom).onclick=this.overlay.onclick=this.close.bind(this)
this.caption=new Element('div',{'id': 'lbCaption'}).injectInside(this.bottom)
this.number=new Element('div',{'id': 'lbNumber'}).injectInside(this.bottom)
new Element('div',{'styles':{'clear': 'both'}}).injectInside(this.bottom)
var nextEffect=this.nextEffect.bind(this)
this.fx={
overlay: this.overlay.effect('opacity',{duration: 500}).hide(),
resize: this.center.effects($extend({duration: this.options.resizeDuration,onComplete: nextEffect},this.options.resizeTransition ?{transition: this.options.resizeTransition}:{})),
image: this.image.effect('opacity',{duration: 500,onComplete: nextEffect}),
bottom: this.bottom.effect('margin-top',{duration: 400,onComplete: nextEffect})}
this.preloadPrev=new Image()
this.preloadNext=new Image()
},
click: function(link){
if(link.rel.length==8)return this.show(link.href,link.title)
var j,imageNum,images=[]
this.anchors.each(function(el){
if(el.rel==link.rel){
for(j=0;j<images.length;j++)if(images[j][0]==el.href)break
if(j==images.length){
images.push([el.href,el.title])
if(el.href==link.href)imageNum=j}}
},this)
return this.open(images,imageNum)
},
show: function(url,title){
return this.open([[url,title]],0)
},
open: function(images,imageNum){
this.images=images
this.position()
this.setup(true)
this.top=window.getScrollTop()+(window.getHeight()/15)
this.center.setStyles({top: this.top,display: ''})
this.fx.overlay.start(0.8)
return this.changeImage(imageNum)
},
position: function(){
this.overlay.setStyles({'top': window.getScrollTop(),'height': window.getHeight()})
},
setup: function(open){
var elements=$A(document.getElementsByTagName('object'))
elements.extend(document.getElementsByTagName(window.ie ? 'select' : 'embed'))
elements.each(function(el){
if(open)el.lbBackupStyle=el.style.visibility
el.style.visibility=open ? 'hidden' : el.lbBackupStyle
})
var fn=open ? 'addEvent' : 'removeEvent'
window[fn]('scroll',this.eventPosition)[fn]('resize',this.eventPosition)
document[fn]('keydown',this.eventKeyDown)
this.step=0
},
keyboardListener: function(event){
switch(event.keyCode){
case 27: case 88: case 67: this.close();break
case 37: case 80: this.previous();break
case 39: case 78: this.next()}
},
previous: function(){
return this.changeImage(this.activeImage-1)
},
next: function(){
return this.changeImage(this.activeImage+1)
},
changeImage: function(imageNum){
if(this.step ||(imageNum<0)||(imageNum>=this.images.length))return false
this.step=1
this.activeImage=imageNum
this.bottomContainer.style.display=this.prevLink.style.display=this.nextLink.style.display='none'
this.fx.image.hide()
this.center.className='lbLoading'
this.preload=new Image()
this.preload.onload=this.nextEffect.bind(this)
this.preload.src=this.images[imageNum][0]
return false
},
nextEffect: function(){
switch(this.step++){
case 1:
this.center.className=''
this.image.style.backgroundImage='url('+this.images[this.activeImage][0]+')'
this.image.style.width=this.bottom.style.width=this.preload.width+'px'
this.image.style.height=this.prevLink.style.height=this.nextLink.style.height=this.preload.height+'px'
this.caption.setHTML(this.images[this.activeImage][1] || '')
this.number.setHTML((!this.options.showCounter ||(this.images.length==1))? '' : ''+(this.activeImage+1)+' / '+this.images.length)
if(this.activeImage)this.preloadPrev.src=this.images[this.activeImage-1][0]
if(this.activeImage !=(this.images.length-1))this.preloadNext.src=this.images[this.activeImage+1][0]
if(this.center.clientHeight !=this.image.offsetHeight){
this.fx.resize.start({height: this.image.offsetHeight})
break}
this.step++
case 2:
if(this.center.clientWidth !=this.image.offsetWidth){
this.fx.resize.start({width: this.image.offsetWidth,marginLeft:-this.image.offsetWidth/2})
break}
this.step++
case 3:
this.bottomContainer.setStyles({top: this.top+this.center.clientHeight,height: 0,marginLeft: this.center.style.marginLeft,display: ''})
this.fx.image.start(1)
break
case 4:
if(this.options.animateCaption){
this.fx.bottom.set(-this.bottom.offsetHeight)
this.bottomContainer.style.height=''
this.fx.bottom.start(0)
break}
this.bottomContainer.style.height=''
case 5:
if(this.activeImage)this.prevLink.style.display=''
if(this.activeImage !=(this.images.length-1))this.nextLink.style.display=''
this.step=0}
},
close: function(){
if(this.step<0)return
this.step=-1
if(this.preload){
this.preload.onload=Class.empty
this.preload=null}
for(var f in this.fx)this.fx[f].stop()
this.center.style.display=this.bottomContainer.style.display='none'
this.fx.overlay.chain(this.setup.pass(false,this)).start(0)
return false}}
window.addEvent('domready',Lightbox.init.bind(Lightbox))