ÿþ// -----------------------------------------------------------------------------------

//

//	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:        '/visor/images/loading.gif',     

    fileBottomNavCloseImage: '/visor/images/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(); });