// LightBox.js
// Javascript Behaviour for the LightBox Control
// Copyright (c) by Matthias Hertel, http://www.mathertel.de
// This work is licensed under a BSD style license. See http://www.mathertel.de/License.aspx
// ----- 
// 18.08.2006 18:13:08 created by Matthias Hertel
// 15.09.2006 18:13:08 DOM Leak removed.
// 16.09.2006 context on event-methods is now set to the bound object.

// a singelton Behaviour !
var LightBoxBehavior = {
  obj: null, // a pointer to the lightbox overlay
  dlg: null, // the current displayed dialog element
  
  init: function() {
    if (this.obj != null)
      alert("The LightBox behavior can only be included once!");
    LightBoxBehavior.obj = this;
  }, // init


  term: function() {
    LightBoxBehavior.dlg = null;
    LightBoxBehavior.obj = null;
  },
  

  // open the current Dialog
  open: function(dlg) {
    if (LightBoxBehavior.dlg != null)
      LightBoxBehavior.hide();

    if ((dlg != null) && (dlg.constructor == String))
      dlg = document.getElementById(dlg);
    LightBoxBehavior.dlg = dlg;
    LightBoxBehavior.show();
  }, // open


  // show the current or a new dialog element
  show: function() {
    var obj = LightBoxBehavior.obj;
    var dlg = LightBoxBehavior.dlg;
    
    obj.style.height = Math.max(document.documentElement.clientHeight, document.documentElement.scrollHeight) + "px";
    obj.style.width = document.documentElement.scrollWidth + "px";

    window.scrollTo(0,0); 
    obj.style.zIndex = 98;
    obj.style.display = "block";

    if (dlg != null) {
      dlg.style.zIndex = 99;
      dlg.style.position = "absolute";
      dlg.style.display = "block";
      
      
      dlg.style.left = (document.documentElement.offsetWidth - dlg.scrollWidth)/2 + "px";
      var arrayPageSize = getPageSize();
	  var arrayPageScroll = getPageScroll();
	  
	  //CL: new code to better calculate top offset; taken from lightbox.js
	  dlg.style.top = arrayPageScroll[1] + (arrayPageSize[3] / 15);		//dlg.style.top = (document.documentElement.clientHeight - dlg.scrollHeight)/2 + "px";
		
      dlg.focus();
    } // if
  }, // show


  // hide the current Dialog in msec milliseconds
  autoHide: function(msec) {
    window.setTimeout(LightBoxBehavior.hide, msec);
  }, // autoHide

  // hide the current Dialog
  hide: function() {
    var obj = LightBoxBehavior.obj;
    var dlg = LightBoxBehavior.dlg;
    
    obj.style.display = "none";
    
    if (dlg != null) {
      dlg.style.zIndex = null;
      dlg.style.display = "none";
      dlg.style.position = "";
      LightBoxBehavior.dlg = null;
    } // if
  }, // hide
  
  
  // show the current Dialog
  openUrl: function(url) {
    LightBoxBehavior.dlg.innerHTML = "<p>loading..." + url + "</p>";
    var f = LightBoxBehavior.frame;
    f.src = url;
    f.onreadystatechange = LightBoxBehavior.ready;
    f.onload = LightBoxBehavior.ready;
    LightBoxBehavior.show();
  }, // openUrl


  ready: function () {
    var f = LightBoxBehavior.frame;
    if ((f.readyState == null) || (f.readyState == "complete")) {
      var s = f.contentWindow.document.body.innerHTML;
      LightBoxBehavior.dlg.innerHTML = s;"<p>loading...<br /><br /><br /><br />....</p>";

      var dlg = LightBoxBehavior.dlg;
      dlg.style.width = dlg.scrollWidth;
      dlg.style.top = (document.documentElement.clientHeight - dlg.scrollHeight)/2 + "px";
      dlg.style.left = (document.documentElement.offsetWidth - dlg.scrollWidth)/2 + "px";
      }
    
  } // ready
} // LightBoxBehavior



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

//
// getPageScroll()
// Returns array with x,y page scroll values.
// Core code from - quirksmode.org
//
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;
}

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

//
// 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 = 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;
}