// -----------------------------------------------------------------------------------
//
// Lightbox v2.04
// by Lokesh Dhakar - http://www.lokeshdhakar.com
// Last Modification: 2/9/08
//
// For more information, visit:
// http://lokeshdhakar.com/projects/lightbox2/
//
// Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
// - Free for use in both personal and commercial projects
// - Attribution requires leaving author name, author link, and the license info intact.
// 
// Thanks: Scott Upton(uptonic.com), Peter-Paul Koch(quirksmode.com), and Thomas Fuchs(mir.aculo.us) for ideas, libs, and snippets.
// Artemy Tregubenko (arty.name) for cleanup and help in updating to latest ver of proto-aculous.
//
// -----------------------------------------------------------------------------------
/*
 Table of Contents
 -----------------
 Configuration
 Lightbox Class Declaration
 - initialize()
 - updateImageList()
 - start()
 - changeImage()
 - resizeImageContainer()
 - showImage()
 - updateDetails()
 - updateNav()
 - enableKeyboardNav()
 - disableKeyboardNav()
 - keyboardAction()
 - preloadNeighborImages()
 - end()
 Function Calls
 - document.observe()
*/
// -----------------------------------------------------------------------------------
//
// Configurationl
//
LightboxOptions = Object.extend({
 fileLoadingImage: 'presse09_files/loading.gif', 
 fileBottomNavCloseImage: 'presse09_files/closelabel.gif',
 overlayOpacity: 0.8, // controls transparency of shadow overlay
 animate: true, // toggles resizing animations
 resizeSpeed: 7, // controls the speed of the image resizing animations (1=slowest and 10=fastest)
 borderSize: 10, //if you adjust the padding in the CSS, you will need to update this variable
// When grouping images this is used to write: Image # of #.
// Change it for non-english localization
labelImage: "Image",
labelOf: "of"
}, window.LightboxOptions || {});
// -----------------------------------------------------------------------------------
var Lightbox = Class.create();
Lightbox.prototype = {
 imageArray: [],
 activeImage: undefined,
 // initialize()
 // Constructor runs on completion of the DOM loading. Calls updateImageList and then
 // the function inserts html at the bottom of the page which is used to display the shadow 
 // overlay and the image container.
 //
 initialize: function() { 
 this.updateImageList();
 this.keyboardAction = this.keyboardAction.bindAsEventListener(this);
 if (LightboxOptions.resizeSpeed> 10) LightboxOptions.resizeSpeed = 10;
 if (LightboxOptions.resizeSpeed <1) LightboxOptions.resizeSpeed = 1;
 this.resizeDuration = LightboxOptions.animate ? ((11 - LightboxOptions.resizeSpeed) * 0.15) : 0;
 this.overlayDuration = LightboxOptions.animate ? 0.2 : 0; // shadow fade in/out duration
 // When Lightbox starts it will resize itself from 250 by 250 to the current image dimension.
 // If animations are turned off, it will be hidden as to prevent a flicker of a
 // white 250 by 250 box.
 var size = (LightboxOptions.animate ? 250 : 1) + 'px';
 // Code inserts html at the bottom of the page that looks similar to this:
 //
 // <div id="overlay"></div>
 // <div id="lightbox">
 // <div id="outerImageContainer">
 // <div id="imageContainer">
 // <img id="lightboxImage">
 // <div style="" id="hoverNav">
 // <a href="#" id="prevLink"></a>
 // <a href="#" id="nextLink"></a>
 // </div>
 // <div id="loading">
 // <a href="#" id="loadingLink">
 // <img src="images/loading.gif">
 // </a>
 // </div>
 // </div>
 // </div>
 // <div id="imageDataContainer">
 // <div id="imageData">
 // <div id="imageDetails">
 // <span id="caption"></span>
 // <span id="numberDisplay"></span>
 // </div>
 // <div id="bottomNav">
 // <a href="#" id="bottomNavClose">
 // <img src="images/close.gif">
 // </a>
 // </div>
 // </div>
 // </div>
 // </div>
 var objBody = $$('body')[0];
objBody.appendChild(Builder.node('div',{id:'overlay'}));
 objBody.appendChild(Builder.node('div',{id:'lightbox'}, [
 Builder.node('div',{id:'outerImageContainer'}, 
 Builder.node('div',{id:'imageContainer'}, [
 Builder.node('img',{id:'lightboxImage'}), 
 Builder.node('div',{id:'hoverNav'}, [
 Builder.node('a',{id:'prevLink', href: '#' }),
 Builder.node('a',{id:'nextLink', href: '#' })
 ]),
 Builder.node('div',{id:'loading'}, 
 Builder.node('a',{id:'loadingLink', href: '#' }, 
 Builder.node('img', {src: LightboxOptions.fileLoadingImage})
 )
 )
 ])
 ),
 Builder.node('div', {id:'imageDataContainer'},
 Builder.node('div',{id:'imageData'}, [
 Builder.node('div',{id:'imageDetails'}, [
 Builder.node('span',{id:'caption'}),
 Builder.node('span',{id:'numberDisplay'})
 ]),
 Builder.node('div',{id:'bottomNav'},
 Builder.node('a',{id:'bottomNavClose', href: '#' },
 Builder.node('img', { src: LightboxOptions.fileBottomNavCloseImage })
 )
 )
 ])
 )
 ]));
$('overlay').hide().observe('click', (function() { this.end(); }).bind(this));
$('lightbox').hide().observe('click', (function(event) { if (event.element().id == 'lightbox') this.end(); }).bind(this));
$('outerImageContainer').setStyle({ width: size, height: size });
$('prevLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage - 1); }).bindAsEventListener(this));
$('nextLink').observe('click', (function(event) { event.stop(); this.changeImage(this.activeImage + 1); }).bindAsEventListener(this));
$('loadingLink').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
$('bottomNavClose').observe('click', (function(event) { event.stop(); this.end(); }).bind(this));
 var th = this;
 (function(){
 var ids = 
 'overlay lightbox outerImageContainer imageContainer lightboxImage hoverNav prevLink nextLink loading loadingLink ' + 
 'imageDataContainer imageData imageDetails caption numberDisplay bottomNav bottomNavClose'; 
 $w(ids).each(function(id){ th[id] = $(id); });
 }).defer();
 },
 //
 // updateImageList()
 // Loops through anchor tags looking for 'lightbox' references and applies onclick
 // events to appropriate links. You can rerun after dynamically adding images w/ajax.
 //
 updateImageList: function() { 
 this.updateImageList = Prototype.emptyFunction;
 document.observe('click', (function(event){
 var target = event.findElement('a[rel^=lightbox]') || event.findElement('area[rel^=lightbox]');
 if (target) {
 event.stop();
 this.start(target);
 }
 }).bind(this));
 },
 //
 // start()
 // Display overlay and lightbox. If image is part of a set, add siblings to imageArray.
 //
 start: function(imageLink) { 
 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'hidden' });
 // stretch overlay to fill page and fade in
 var arrayPageSize = this.getPageSize();
 $('overlay').setStyle({ width: arrayPageSize[0] + 'px', height: arrayPageSize[1] + 'px' });
 new Effect.Appear(this.overlay, { duration: this.overlayDuration, from: 0.0, to: LightboxOptions.overlayOpacity });
 this.imageArray = [];
 var imageNum = 0; 
 if ((imageLink.rel == 'lightbox')){
 // if image is NOT part of a set, add single image to imageArray
 this.imageArray.push([imageLink.href, imageLink.title]); 
 } else {
 // if image is part of a set..
 this.imageArray = 
 $$(imageLink.tagName + '[href][rel="' + imageLink.rel + '"]').
 collect(function(anchor){ return [anchor.href, anchor.title]; }).
 uniq();
 while (this.imageArray[imageNum][0] != imageLink.href) { imageNum++; }
 }
 // calculate top and left offset for the lightbox 
 var arrayPageScroll = document.viewport.getScrollOffsets();
 var lightboxTop = arrayPageScroll[1] + (document.viewport.getHeight() / 10);
 var lightboxLeft = arrayPageScroll[0];
 this.lightbox.setStyle({ top: lightboxTop + 'px', left: lightboxLeft + 'px' }).show();
 this.changeImage(imageNum);
 },
 //
 // changeImage()
 // Hide most elements and preload image in preparation for resizing image container.
 //
 changeImage: function(imageNum) { 
 this.activeImage = imageNum; // update global var
 // hide elements during transition
 if (LightboxOptions.animate) this.loading.show();
 this.lightboxImage.hide();
 this.hoverNav.hide();
 this.prevLink.hide();
 this.nextLink.hide();
// HACK: Opera9 does not currently support scriptaculous opacity and appear fx
 this.imageDataContainer.setStyle({opacity: .0001});
 this.numberDisplay.hide(); 
 var imgPreloader = new Image();
 // once image is preloaded, resize image container
 imgPreloader.onload = (function(){
 this.lightboxImage.src=this.imageArray[this.activeImage][0];
 this.resizeImageContainer(imgPreloader.width, imgPreloader.height);
 }).bind(this);
 imgPreloader.src=this.imageArray[this.activeImage][0];
 },
 //
 // resizeImageContainer()
 //
 resizeImageContainer: function(imgWidth, imgHeight) {
 // get current width and height
 var widthCurrent = this.outerImageContainer.getWidth();
 var heightCurrent = this.outerImageContainer.getHeight();
 // get new width and height
 var widthNew = (imgWidth + LightboxOptions.borderSize * 2);
 var heightNew = (imgHeight + LightboxOptions.borderSize * 2);
 // scalars based on change from old to new
 var xScale = (widthNew / widthCurrent) * 100;
 var yScale = (heightNew / heightCurrent) * 100;
 // calculate size difference between new and old image, and resize if necessary
 var wDiff = widthCurrent - widthNew;
 var hDiff = heightCurrent - heightNew;
 if (hDiff != 0) new Effect.Scale(this.outerImageContainer, yScale, {scaleX: false, duration: this.resizeDuration, queue: 'front'}); 
 if (wDiff != 0) new Effect.Scale(this.outerImageContainer, xScale, {scaleY: false, duration: this.resizeDuration, delay: this.resizeDuration}); 
 // if new and old image are same size and no scaling transition is necessary, 
 // do a quick pause to prevent image flicker.
 var timeout = 0;
 if ((hDiff == 0) && (wDiff == 0)){
 timeout = 100;
 if (Prototype.Browser.IE) timeout = 250; 
 }
 (function(){
 this.prevLink.setStyle({ height: imgHeight + 'px' });
 this.nextLink.setStyle({ height: imgHeight + 'px' });
 this.imageDataContainer.setStyle({ width: widthNew + 'px' });
 this.showImage();
 }).bind(this).delay(timeout / 1000);
 },
 //
 // showImage()
 // Display image and begin preloading neighbors.
 //
 showImage: function(){
 this.loading.hide();
 new Effect.Appear(this.lightboxImage, { 
 duration: this.resizeDuration, 
 queue: 'end', 
 afterFinish: (function(){ this.updateDetails(); }).bind(this) 
 });
 this.preloadNeighborImages();
 },
 //
 // updateDetails()
 // Display caption, image number, and bottom nav.
 //
 updateDetails: function() {
 // if caption is not null
 if (this.imageArray[this.activeImage][1] != ""){
 this.caption.update(this.imageArray[this.activeImage][1]).show();
 }
 // if image is part of set display 'Image x of x' 
 if (this.imageArray.length> 1){
 this.numberDisplay.update( LightboxOptions.labelImage + ' ' + (this.activeImage + 1) + ' ' + LightboxOptions.labelOf + ' ' + this.imageArray.length).show();
 }
 new Effect.Parallel(
 [ 
 new Effect.SlideDown(this.imageDataContainer, { sync: true, duration: this.resizeDuration, from: 0.0, to: 1.0 }), 
 new Effect.Appear(this.imageDataContainer, { sync: true, duration: this.resizeDuration }) 
 ], 
 { 
 duration: this.resizeDuration, 
 afterFinish: (function() {
 // update overlay size and update nav
 var arrayPageSize = this.getPageSize();
 this.overlay.setStyle({ height: arrayPageSize[1] + 'px' });
 this.updateNav();
 }).bind(this)
 } 
 );
 },
 //
 // updateNav()
 // Display appropriate previous and next hover navigation.
 //
 updateNav: function() {
 this.hoverNav.show(); 
 // if not first image in set, display prev image button
 if (this.activeImage> 0) this.prevLink.show();
 // if not last image in set, display next image button
 if (this.activeImage <(this.imageArray.length - 1)) this.nextLink.show();
 this.enableKeyboardNav();
 },
 //
 // enableKeyboardNav()
 //
 enableKeyboardNav: function() {
 document.observe('keydown', this.keyboardAction); 
 },
 //
 // disableKeyboardNav()
 //
 disableKeyboardNav: function() {
 document.stopObserving('keydown', this.keyboardAction); 
 },
 //
 // keyboardAction()
 //
 keyboardAction: function(event) {
 var keycode = event.keyCode;
 var escapeKey;
 if (event.DOM_VK_ESCAPE) { // mozilla
 escapeKey = event.DOM_VK_ESCAPE;
 } else { // ie
 escapeKey = 27;
 }
 var key = String.fromCharCode(keycode).toLowerCase();
 if (key.match(/x|o|c/) || (keycode == escapeKey)){ // close lightbox
 this.end();
 } else if ((key == 'p') || (keycode == 37)){ // display previous image
 if (this.activeImage != 0){
 this.disableKeyboardNav();
 this.changeImage(this.activeImage - 1);
 }
 } else if ((key == 'n') || (keycode == 39)){ // display next image
 if (this.activeImage != (this.imageArray.length - 1)){
 this.disableKeyboardNav();
 this.changeImage(this.activeImage + 1);
 }
 }
 },
 //
 // preloadNeighborImages()
 // Preload previous and next images.
 //
 preloadNeighborImages: function(){
 var preloadNextImage, preloadPrevImage;
 if (this.imageArray.length> this.activeImage + 1){
 preloadNextImage = new Image();
 preloadNextImage.src=this.imageArray[this.activeImage + 1][0];
 }
 if (this.activeImage> 0){
 preloadPrevImage = new Image();
 preloadPrevImage.src=this.imageArray[this.activeImage - 1][0];
 }
 },
 //
 // end()
 //
 end: function() {
 this.disableKeyboardNav();
 this.lightbox.hide();
 new Effect.Fade(this.overlay, { duration: this.overlayDuration });
 $$('select', 'object', 'embed').each(function(node){ node.style.visibility = 'visible' });
 },
 //
 // getPageSize()
 //
 getPageSize: function() {
 var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = window.innerWidth + window.scrollMaxX;
yScroll = window.innerHeight + window.scrollMaxY;
} else if (document.body.scrollHeight> document.body.offsetHeight){ // all but Explorer Mac
xScroll = document.body.scrollWidth;
yScroll = document.body.scrollHeight;
} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
xScroll = document.body.offsetWidth;
yScroll = document.body.offsetHeight;
}
var windowWidth, windowHeight;
if (self.innerHeight) {// all except Explorer
if(document.documentElement.clientWidth){
windowWidth = document.documentElement.clientWidth; 
} else {
windowWidth = self.innerWidth;
}
windowHeight = self.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
windowWidth = document.documentElement.clientWidth;
windowHeight = document.documentElement.clientHeight;
} else if (document.body) { // other Explorers
windowWidth = document.body.clientWidth;
windowHeight = document.body.clientHeight;
}
// for small pages with total height less then height of the viewport
if(yScroll <windowHeight){
pageHeight = windowHeight;
} else { 
pageHeight = yScroll;
}
// for small pages with total width less then width of the viewport
if(xScroll <windowWidth){
pageWidth = xScroll;
} else {
pageWidth = windowWidth;
}
return [pageWidth,pageHeight];
}
}
document.observe('dom:loaded', function () { new Lightbox(); });