/*
	Lightbox JS: Fullsize Image Overlays 
	by Lokesh Dhakar - http://www.huddletogether.com

	For more information on this script, visit:
	http://huddletogether.com/projects/lightbox/

	Script featured on Dynamic Drive code library Jan 24th, 06':
	http://www.dynamicdrive.com

	Licensed under the Creative Commons Attribution 2.5 License - http://creativecommons.org/licenses/by/2.5/
	(basically, do anything you want, just leave my name and link)
	
	Table of Contents
	-----------------
	Configuration
	
	Functions
	- getPageScroll()
	- getPageSize()
	- pause()
	- getKey()
	- listenKey()
	- showLightbox()
	- hideLightbox()
	- initLightbox()
	- addLoadEvent()
	
	Function Calls
	- addLoadEvent(initLightbox)

*/



//
// Configuration
//

// If you would like to use a custom loading image or close button reference them in the next two lines.
var loadingImage = 'images/loading.gif';		
var closeButton = 'images/close.gif';		





//
// getKey(key)
// Gets keycode. If 'x' is pressed then it hides the lightbox.
//

function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){ hideLightbox(); }
}


//
// listenKey()
//
function listenKey () {	document.onkeypress = getKey; }
	
var imageRatio = 0;

function showOverlay()
{
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLoadingImage = document.getElementById('loadingImage');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// center loadingImage if it exists
	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	// set height of Overlay to take up whole page and show
	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';
}
 
//
// showLightbox()
// Preloads images. Pleaces new image in lightbox then centers and displays.
//
function showLightbox(objLink)
{
	// prep objects
	var objOverlay = document.getElementById('overlay');
	var objLoadingImage = document.getElementById('loadingImage');
	var objLightbox = document.getElementById('lightbox');
	var objTitle = document.getElementById('lightboxTitle');
	var objImage = document.getElementById('lightboxImage');
	var objLightboxDetails = document.getElementById('lightboxDetails');
	var objArtist = document.getElementById('lightboxArtist');
	var objMedium = document.getElementById('lightboxMedium');
	var objSize = document.getElementById('lightboxSize');
	var objPrice = document.getElementById('lightboxPrice');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

    showOverlay();

	// preload image
	imgPreload = new Image();

	imgPreload.onload=function(){
		objImage.src = objLink.href;

        var width = (arrayPageSize[0] * .75);
        var height = (arrayPageSize[3] * .75);
        var screenRatio = height / width;
        imageRatio = imgPreload.height / imgPreload.width;  
        if (screenRatio < imageRatio) {
                objImage.style.height = height + 'px';
                objImage.style.width = null; 
                width = height / imageRatio;
                imageBottom = objImage.clientTop + height;
                imageRight = objImage.clientLeft + (height / imageRatio); }
        else {
               objImage.style.width = width + 'px';
               objImage.style.height = null;
               height = width * imageRatio;      
               imageBottom = objImage.clientTop + (width * imageRatio);
               imageRight = objImage.clientLeft + width; }
           
                
		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
		objLightbox.style.width = width + 'px';
		objLightbox.style.height= height + 15 + 'px';
		
			
		if(objLink.getAttribute('pictureTitle')){
			objTitle.style.display = 'block';
			//objTitle.style.width = imgPreload.width + 'px';
			objTitle.innerHTML = objLink.getAttribute('pictureTitle');
		} else {
			objTitle.style.display = 'none';
		}
		
	    if(objLink.getAttribute('artist')){
			objArtist.style.display = 'block';
			objArtist.innerHTML = objLink.getAttribute('Artist');
		} else {
			objArtist.style.display = 'none';
		}
	    
	    if(objLink.getAttribute('medium')){
			objMedium.style.display = 'block';
			objMedium.innerHTML = objLink.getAttribute('Medium');
		} else {
			objMedium.style.display = 'none';
		}
			    
	    if(objLink.getAttribute('size')){
			objSize.style.display = 'block';
			objSize.innerHTML = objLink.getAttribute('Size');
		} else {
			objSize.style.display = 'none';
		}	    
		
	    if(objLink.getAttribute('price')){
			objPrice.style.display = 'block';
			objPrice.innerHTML = objLink.getAttribute('Price');
		} else {
			objPrice.style.display = 'none';
		}
		
		// A small pause between the image loading and displaying is required with IE,
		// this prevents the previous image displaying for a short burst causing flicker.
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }
		objLightbox.style.display = 'block';
		
		//objLightboxDetails.style.width = nWidth + 'px';
		//objLightboxDetails.style.height = nHeight + 'px';
		
		// After image is loaded, update the overlay height as the new image might have
		// increased the overall page height.
		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		
		// Check for 'x' keypress
		listenKey();
		
        positionText(imageBottom, imageRight);

		return false;
	}

	imgPreload.src = objLink.href;
	
}

function resizePopupImage() {
	var objLightbox = document.getElementById('lightbox');
	var objImage = document.getElementById('lightboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	
		var arrayPageSize = getPageSize();
	    var arrayPageScroll = getPageScroll();


        var width = (arrayPageSize[0] * .75);
        var height = (arrayPageSize[3] * .75);
        var screenRatio = height / width;
        if (screenRatio < imageRatio) {
                objImage.style.height = height + 'px';
                objImage.style.width = null; 
                width = height / imageRatio;
                imageBottom = objImage.clientTop + height;
                imageRight = objImage.clientLeft + (height / imageRatio); }
        else {
               objImage.style.width = width + 'px';
               objImage.style.height = null;
               height = width * imageRatio;      
               imageBottom = objImage.clientTop + (width * imageRatio);
               imageRight = objImage.clientLeft + width; }      
               
        positionText(imageBottom, imageRight);
                 
		// center lightbox and make sure that the top and left values are not negative
		// and the image placed outside the viewport
		var lightboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - height) / 2);
		var lightboxLeft = ((arrayPageSize[0] - 20 - width) / 2);
		
		objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
		objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";
		objLightbox.style.width = width + 'px';
		objLightbox.style.height= height + 15 + 'px';

}


//
// hideLightbox()
//
function hideLightbox()
{
	
	hideOverlay();
	
	// get objects
	objLightbox = document.getElementById('lightbox');

	// hide lightbox and overlay
	objLightbox.style.display = 'none';
	
	// disable keypress listener
	document.onkeypress = '';
}

function hideOverlay()
{
	// get objects
	objOverlay = document.getElementById('overlay');

	// hide lightbox and overlay
	objOverlay.style.display = 'none';
}


function initOverlay()
{
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideLightbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '200';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
}

//
// initLightbox()
// Function runs on window load, going through link tags looking for rel="lightbox".
// These links receive onclick events that enable the lightbox display for their targets.
// The function also inserts html markup at the top of the page which will be used as a
// container for the overlay pattern and the inline image.
//
function initLightbox()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "lightbox")){
			anchor.onclick = function () {showLightbox(this); return false;}
		}
	}

	// the rest of this code inserts html at the top of the page that looks like this:
	//
	// <div id="overlay">
	//		<a href="#" onclick="hideLightbox(); return false;"><img id="loadingImage" /></a>
	//	</div>
	// <div id="lightbox">
	//		<a href="#" onclick="hideLightbox(); return false;" title="Click anywhere to close image">
	//			<img id="closeButton" />		
	//			<img id="lightboxImage" />
	//		</a>
	//		<div id="lightboxDetails">
	//			<div id="lightboxTitle"></div>
//	        <div id="imageText">
//            <h1>
//                <asp:Label ID="lbTitle" runat="server" Text="### Title ###"></asp:Label></h1>
//            <h2>
//                <asp:Label ID="lbArtistName" runat="server" Text="### Artist ###"></asp:Label></h2>
//                <asp:Label ID="lbMedium" runat="server" Text=""></asp:Label>
//            </div>
	//			<div id="keyboardMsg"></div>
	//		</div>
	// </div>
	
	var objBody = document.getElementsByTagName("body").item(0);
	
	// create overlay div and hardcode some functional styles (aesthetic styles are in CSS file)
    initOverlay();
    objOverlay = document.getElementById('overlay');
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	// preload and create loader image
	var imgPreloader = new Image();
	
	// if loader image found, create link to hide lightbox and create loadingimage
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideLightbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '260';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload=function(){};	//	clear onLoad, as IE will flip out w/animated gifs

		return false;
	}

	imgPreloader.src = loadingImage;

	// create lightbox div, same note about styles as above
	var objLightbox = document.createElement("div");
	objLightbox.setAttribute('id','lightbox');
	objLightbox.style.display = 'none';
	objLightbox.style.position = 'absolute';
	objLightbox.style.zIndex = '210';	
	objBody.insertBefore(objLightbox, objOverlay.nextSibling);
	
	// create link
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Click to close');
	objLink.onclick = function () {hideLightbox(); return false;}
	objLightbox.appendChild(objLink);

	// preload and create close button image
	var imgPreloadCloseButton = new Image();

	// if close button image found, 
	imgPreloadCloseButton.onload=function(){

		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '310';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;

	// create image
	var objImage = document.createElement("img");
	objImage.setAttribute('id','lightboxImage');
	objLightbox.style.position = 'absolute';
	objLink.appendChild(objImage);
	
	var objLightboxDetailsContainer = document.createElement("div");
	objLightboxDetailsContainer.setAttribute('id','imageTextContainer');
	objLightbox.appendChild(objLightboxDetailsContainer);

		// create details div, a container for the caption and keyboard message
	var objLightboxDetails = document.createElement("div");
	objLightboxDetails.setAttribute('id','imageText');
	objLightbox.appendChild(objLightboxDetails);

	// create title
	var objTitle = document.createElement("h1");
	objTitle.setAttribute('id','lightboxTitle');
	objTitle.style.display = 'none';
	objLightboxDetails.appendChild(objTitle);

    //create Artist
 	var objArtist = document.createElement("h2");
	objArtist.setAttribute('id','lightboxArtist');
	objArtist.style.display = 'none';
	objLightboxDetails.appendChild(objArtist);
   
    //create Medium
 	var objMedium = document.createElement("div");
	objMedium.setAttribute('id','lightboxMedium');
	objMedium.style.display = 'none';
	objLightboxDetails.appendChild(objMedium);
   
    //create Size
 	var objSize = document.createElement("div");
	objSize.setAttribute('id','lightboxSize');
	objSize.style.display = 'none';
	objLightboxDetails.appendChild(objSize);
   
    //create Price
 	var objPrice = document.createElement("div");
	objPrice.setAttribute('id','lightboxPrice');
	objPrice.style.display = 'none';
	objLightboxDetails.appendChild(objPrice);

	// create keyboard message
	var objKeyboardMsg = document.createElement("div");
	objKeyboardMsg.setAttribute('id','keyboardMsg');
	objKeyboardMsg.innerHTML = 'press <kbd>x</kbd> to close';
	objLightbox.appendChild(objKeyboardMsg);
	
	window.onresize=function () {resizePopupImage();}

}


function positionText(imageBottom, imageRight) {
	var objImage = document.getElementById('lightboxImage');
	var imageText = document.getElementById('imageText');
    var imageTextContainer = document.getElementById('imageTextContainer');
    if (imageText) {
        var offsetLeft = imageRight - imageText.offsetWidth - 10;
        var offsetTop = imageBottom - imageText.offsetHeight - 10;
        imageText.style.left = offsetLeft + 'px';
        imageText.style.top = offsetTop + 'px';
        imageText.style.visibility = 'visible';
        imageTextContainer.style.left = offsetLeft + 'px';
        imageTextContainer.style.top = offsetTop + 'px';
        imageTextContainer.style.visibility = 'visible';
        imageTextContainer.style.display = 'block';
        if (imageText.offsetWidth > 10) {
            imageTextContainer.style.width = (imageText.offsetWidth - 10) + 'px';
        }
        if (imageText.offsetHeight > 10) {
            imageTextContainer.style.height = (imageText.offsetHeight - 10) + 'px';
        }
    }
    else {
        imageTextContainer.style.display = 'none';
    }
}
   

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}

function editPictureFrame(pictureID)
{
    document.getElementById('PictureViewerFrame').src = 'EditPicture.aspx?PictureID=' + pictureID;
    openPictureEditor();
}

function newPictureFrame()
{
    document.getElementById('PictureViewerFrame').src = 'EditPicture.aspx';
    openPictureEditor();
}

function openPictureEditor()
{   
    showOverlay();
    document.getElementById('EditPictureViewer').style.display = 'block';
    nHeight = getWindowHeight();
    nWidth = getWindowWidth();
    nTopOffset = (nHeight - document.getElementById('EditPictureViewer').offsetHeight) / 2;
    nLeftOffset = (nWidth - document.getElementById('EditPictureViewer').offsetWidth) / 2;
    document.getElementById('EditPictureViewer').style.top = document.documentElement.scrollTop + nTopOffset + 'px';
    document.getElementById('EditPictureViewer').style.left = document.documentElement.scrollLeft + nLeftOffset + 'px';
    document.getElementById('PictureViewerFrame').style.height = '100%';	
    document.getElementById('PictureViewerFrame').style.width = '100%';	
 
	// update the overlay height as the iFrame might have
	// increased the overall page height.
	arrayPageSize = getPageSize();
	objOverlay = document.getElementById('overlay');
	objOverlay.style.height = (arrayPageSize[1] + 'px');
}
 
function closePictureEditor()
{
    document.getElementById('PictureViewerFrame').src = '';
    document.getElementById('EditPictureViewer').style.display = 'none';
    hideOverlay();
}

function closeEditPictureFrame()
{
    window.parent.document.forms(0).submit;
}
        
function resizeEditPictureFrame()
{
    nHeight = getWindowHeight();
    nWidth = getWindowWidth();
    document.getElementById('PictureViewerFrame').document.body.style.height = document.getElementById('PictureViewerFrame').style.height;
    document.getElementById('PictureViewerFrame').document.body.style.width = document.getElementById('PictureViewerFrame').style.width;
 }