User:Hartz/monobook.js

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/* Trying to get Lightbox (http://huddletogether.com/projects/lightbox/) working in MediaWiki. */

var loadingImage = 'http://www.huddletogether.com/projects/lightbox2/images/loading.gif';
var closeButton = 'http://www.huddletogether.com/projects/lightbox2/images/close.gif';

function getPageScroll() {
    var yScroll;
    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop){	// Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) { // all other Explorers
        yScroll = document.body.scrollTop;
    }

    arrayPageScroll = new Array('', yScroll) 
    return arrayPageScroll;
}

function getPageSize() {
    var xScroll, yScroll;
    if (window.innerHeight && window.scrollMaxY) {	
        xScroll = document.body.scrollWidth;
        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
        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 = windowWidth;
    } else {
        pageWidth = xScroll;
    }

    arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight) 
    return arrayPageSize;
}

function pause(numberMillis) {
    var now = new Date();
    var exitTime = now.getTime() + numberMillis;
    while (true) {
        now = new Date();
        if (now.getTime() > exitTime)
            return;
    }
}

function showLightbox(objLink) {
    // prep objects
    var objOverlay = document.getElementById('overlay');
    var objLightbox = document.getElementById('lightbox');
    var objCaption = document.getElementById('lightboxCaption');
    var objImage = document.getElementById('lightboxImage');
    var objLoadingImage = document.getElementById('loadingImage');
    var objLightboxDetails = document.getElementById('lightboxDetails');

    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';

    // preload image
    imgPreload = new Image();

    imgPreload.onload=function() {
        objImage.src = objLink.href;
        // 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 - imgPreload.height) / 2);
        var lightboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		
        objLightbox.style.top = (lightboxTop < 0) ? "0px" : lightboxTop + "px";
        objLightbox.style.left = (lightboxLeft < 0) ? "0px" : lightboxLeft + "px";

        objLightboxDetails.style.width = imgPreload.width + 'px';
	
        if (objLink.getAttribute('title')) {
            objCaption.style.display = 'block';
            //objCaption.style.width = imgPreload.width + 'px';
            objCaption.innerHTML = objLink.getAttribute('title');
        } else {
            objCaption.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);
        } 

        // Hide loadingImage
        if (objLoadingImage) {
            objLoadingImage.style.display = 'none';
        }

        // Hide select boxes as they will 'peek' through the image in IE
        selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
            selects[i].style.visibility = "hidden";
        }

        objLightbox.style.display = 'block';

        // 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');

        return false;
    }
    imgPreload.src = objLink.href;
}

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

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

    // make select boxes visible
    selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
        selects[i].style.visibility = "visible";
    }
}

function initLightbox() {
    var content = document.getElementById('content');
    if (content) {
        var anchors = document.getElementsByTagName('a');
        for (var i = 0; i < anchors.length; i++) {
            var anchor = anchors[i];
	    if (anchor.getAttribute('href') && (anchor.getAttribute('class') == 'image') || (anchor.getAttribute('class') == 'internal')) {
                anchor.onclick = function() {
                    showLightbox(this); // '/wiki/Image:Thumb.png'
                    alert(this);
                    return false;
                }
	    }
	}
        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 = '90';
        objOverlay.style.width = '100%';
        objBody.insertBefore(objOverlay, objBody.firstChild);
	
        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 = '150';
            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 = '100';	
        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 = '200';
            objLink.appendChild(objCloseButton);
            return false;
        }

        imgPreloadCloseButton.src = closeButton;

        // create image
        var objImage = document.createElement("img");
        objImage.setAttribute('id','lightboxImage');
        objLink.appendChild(objImage);
	
        // create details div, a container for the caption
        var objLightboxDetails = document.createElement("div");
        objLightboxDetails.setAttribute('id','lightboxDetails');
        objLightbox.appendChild(objLightboxDetails);

        // create caption
        var objCaption = document.createElement("div");
        objCaption.setAttribute('id','lightboxCaption');
        objCaption.style.display = 'none';
        objLightboxDetails.appendChild(objCaption);
    }
}

function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            oldonload();
            func();
        }
    }
}

addLoadEvent(initLightbox);
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