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/* $Id: lightbox_lite.js,v 1.1.2.2.2.19 2010/06/07 14:54:30 snpower Exp $ */

/**

 * Lightbox JS: Fullsize Image Overlays

 * by Lokesh Dhakar - http://www.huddletogether.com

 *

 * For more information on this script, visit:

 * http://huddletogether.com/projects/lightbox/

 *

 * This script is distributed via Drupal.org with permission from Lokesh Dhakar.

 * Under GPL license.

 *    Mailto: bugzie@gmail.com

 */

// start jQuery block

(function ($) {

//

// getPageScroll()

// Returns array with x,y page scroll values.

// Core code from - quirksmode.org

//

function getPageScroll() {

  var xScroll, yScroll;

  if (self.pageYOffset) {

    yScroll = self.pageYOffset;

    xScroll = self.pageXOffset;

  // Explorer 6 Strict

  }

  else if (document.documentElement && document.documentElement.scrollTop) {

    yScroll = document.documentElement.scrollTop;

    xScroll = document.documentElement.scrollLeft;

  }

  else if (document.body) {// all other Explorers

    yScroll = document.body.scrollTop;

    xScroll = document.body.scrollLeft;

  }

  arrayPageScroll = [xScroll, yScroll];

  return arrayPageScroll;

}

// getPageSize()

// Returns array with page width, height and window width, height

// Core code from - quirksmode.org

// Edit for Firefox by pHaez

function getPageSize() {

  var xScroll, yScroll;

  if (window.innerHeight && window.scrollMaxY) {

    xScroll = window.innerWidth + window.scrollMaxX;

    yScroll = window.innerHeight + window.scrollMaxY;

  // all but Explorer Mac

  }

  else if (document.body.scrollHeight > document.body.offsetHeight) {

    xScroll = document.body.scrollWidth;

    yScroll = document.body.scrollHeight;

  // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari

  }

  else {

    xScroll = document.body.offsetWidth;

    yScroll = document.body.offsetHeight;

  }

  var windowWidth, windowHeight;

  if (self.innerHeight) { // all except Explorer

    if (document.documentElement.clientHeight) {

      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;

  }

  arrayPageSize = [pageWidth, pageHeight, windowWidth, windowHeight];

  return arrayPageSize;

}

// pause(numberMillis)

function pause(ms) {

  var date = new Date();

  var curDate = null;

  do { curDate = new Date(); }

  while (curDate - date < ms);

}

// hideLightbox()

function hideLightbox() {

  // get objects

  objOverlay = document.getElementById('lightbox2-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++) {

    if (selects[i].style.display != "none") {

      selects[i].style.visibility = "visible";

    }

  }

  // make flash objects visible

  embed = document.getElementsByTagName("embed");

  for (i = 0; i != embed.length; i++) {

    if (embed[i].style.display != "none") {

      embed[i].style.visibility = "visible";

    }

  }

  objects = document.getElementsByTagName("object");

  for (i = 0; i != objects.length; i++) {

    if (objects[i].style.display != "none") {

      objects[i].style.visibility = "visible";

    }

  }

  // disable keydown listener

  document.onkeydown = '';

}

// getKey(key)

// Gets keycode. If 'x' is pressed then it hides the lightbox.

function getKey(e) {

  if (e === null) { // ie

    keycode = event.keyCode;

    escapeKey = 27;

  }

  else { // mozilla

    keycode = e.keyCode;

    escapeKey = e.DOM_VK_ESCAPE;

  }

  key = String.fromCharCode(keycode).toLowerCase();

  if (key == 'x' || key == 'c' || keycode == escapeKey) { hideLightbox(); }

}

// listenKey()

function listenKey () { document.onkeydown = getKey; }

function imgLoadingError(image, objImage, objLink) {

  var settings = Drupal.settings.lightbox2;

  image.src = settings.default_image;

  objImage.src = settings.default_image;

  objLink.href = settings.default_image;

}

// showLightbox()

// Preloads images. Pleaces new image in lightbox then centers and displays.

function showLightbox(objLink) {

  var settings = Drupal.settings.lightbox2;

  // prep objects

  var objOverlay = document.getElementById('lightbox2-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();

  // set height of Overlay to take up whole page and show

  objOverlay.style.height = (arrayPageSize[1] + 'px');

  objOverlay.style.display = 'block';

  objOverlay.style.opacity = settings.overlay_opacity;

  objOverlay.style.backgroundColor = '#' + settings.overlay_color;

  // preload image

  imgPreload = new Image();

  imgPreload.onerror = function() { imgLoadingError(this, objImage, objLink); };

  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';

    objLightbox.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);

    }

    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++) {

      if (selects[i].style.display != "none") {

        selects[i].style.visibility = "hidden";

      }

    }

    // Hide flash objects as they will 'peek' through the image in IE

    embed = document.getElementsByTagName("embed");

    for (i = 0; i != embed.length; i++) {

      if (embed[i].style.display != "none") {

        embed[i].style.visibility = "hidden";

      }

    }

    objects = document.getElementsByTagName("object");

    for (i = 0; i != objects.length; i++) {

      if (objects[i].style.display != "none") {

        objects[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');

    // Check for 'x' keydown

    listenKey();

    return false;

  };

  imgPreload.src = objLink.href;

}

// 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];

    var relAttribute = String(anchor.getAttribute("rel"));

    if (anchor.getAttribute("href") && relAttribute.toLowerCase().match("lightbox")) {

      $(anchor).click(function(e) { showLightbox(this); if (e.preventDefault) { e.preventDefault(); } return false; });

    }

  }

  // the rest of this code inserts html at the top of the page that looks like

  // this:

  // <div id="lightbox2-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="lightboxCaption"></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)

  var objOverlay = document.createElement("div");

  objOverlay.setAttribute('id', 'lightbox2-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();

  // create loader image

  var objLoadingImage = document.createElement("span");

  objLoadingImage.setAttribute('id', 'loadingImage');

  objOverlay.appendChild(objLoadingImage);

  // 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);

  // create close button image

  var objCloseButton = document.createElement("span");

  objCloseButton.setAttribute('id', 'closeButton');

  objLink.appendChild(objCloseButton);

  // create image

  var objImage = document.createElement("img");

  objImage.setAttribute('id', 'lightboxImage');

  objLink.appendChild(objImage);

  // create details div, a container for the caption and keyboard message

  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);

  // create keyboard message

  var settings = Drupal.settings.lightbox2;

  var objKeyboardMsg = document.createElement("div");

  objKeyboardMsg.setAttribute('id', 'keyboardMsg');

  objKeyboardMsg.innerHTML = settings.lite_press_x_close;

  objLightboxDetails.appendChild(objKeyboardMsg);

}

Drupal.behaviors.initLightbox2 = {

  attach: function(context) {

    initLightbox();

  }

};

//End jQuery block

}(jQuery));