// -----------------------------------------------------------------------------------


//


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


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