/** 
 *  @fileoverview TextResizeDetector
 * 
 *  Detects changes to font sizes when user changes browser settings
 *  <br>Fires a custom event with the following data:<br><br>
 * 	iBase  : base font size  	
 *	iDelta : difference in pixels from previous setting<br>
 *	iSize  : size in pixel of text<br>
 *  
 *  * @author Lawrence Carvalho carvalho@uk.yahoo-inc.com
 * 	@version 1.0
 */

// @constructor
TextResizeDetector = function() { 
	var el = null;
	var iIntervalDelay = 200;
	var iInterval = null;
	var iCurrSize = -1;
	var iBase = -1;
 	var aListeners = [];
 	var createControlElement = function() {
		el = document.createElement('span');
		el.id='textResizeControl';
		el.innerHTML='&nbsp;';
		el.style.position="absolute";
		el.style.left="-9999px";
		var elC = document.getElementById(TextResizeDetector.TARGET_ELEMENT_ID);
		// insert before firstChild
		if (elC) elC.insertBefore(el,elC.firstChild);
		iBase = iCurrSize = TextResizeDetector.getSize();
 	};

 	function _stopDetector() {
		window.clearInterval(iInterval);
		iInterval=null;
	};
	
	function _startDetector() {
		if (!iInterval) iInterval = window.setInterval('TextResizeDetector.detect()',iIntervalDelay);
	};
 	
 	function _detect() {
 		var iNewSize = TextResizeDetector.getSize();
		
 		if(iNewSize !== iCurrSize) {
			for (var i=0; i < aListeners.length; i++) {
				aListnr = aListeners[i];
				var oArgs = {  iBase: iBase,iDelta:((iCurrSize!=-1) ? iNewSize - iCurrSize + 'px' : "0px"),iSize:iCurrSize = iNewSize};
				if (!aListnr.obj) aListnr.fn('textSizeChanged',[oArgs]);
				else aListnr.fn.apply(aListnr.obj,['textSizeChanged',[oArgs]]);
			}
 		}
 		return iCurrSize;
 	};
 	
	var onAvailable = function() {
		
		if (!TextResizeDetector.onAvailableCount_i) TextResizeDetector.onAvailableCount_i = 0;

		if (document.getElementById(TextResizeDetector.TARGET_ELEMENT_ID)) {
			TextResizeDetector.init();
			if(TextResizeDetector.USER_INIT_FUNC) TextResizeDetector.USER_INIT_FUNC();
			TextResizeDetector.onAvailableCount_i = null;
		}
		else {
			if(TextResizeDetector.onAvailableCount_i < 600) {
	  	 	    TextResizeDetector.onAvailableCount_i++;
				setTimeout(onAvailable,200)
			}
		}
	};
	
	setTimeout(onAvailable,500);

 	return {
		 	/*
		 	 * Initializes the detector
		 	 * 
		 	 * @param {String} sId The id of the element in which to create the control element
		 	 */
		 	init: function() {
		 		createControlElement();		
				_startDetector();
 			},
			/**
			 * Adds listeners to the ontextsizechange event. 
			 * Returns the base font size
			 * 
			 */
 			addEventListener:function(fn, obj, bScope) {
				aListeners[aListeners.length] = {
					fn: fn,
					obj: obj
				}
				return iBase;
			},
			/**
			 * performs the detection and fires textSizeChanged event
			 * @return the current font size
			 * @type {integer}
			 */
 			detect:function() {
 				return _detect();
 			},
 			/**
 			 * Returns the height of the control element
 			 * 
			 * @return the current height of control element
			 * @type {integer}
 			 */
 			getSize:function() {
	 				var iSize;
			 		return el.offsetHeight;
 			},
 			/**
 			 * Stops the detector
 			 */
 			stopDetector:function() {
				return _stopDetector();
			},
			/*
			 * Starts the detector
			 */
 			startDetector:function() {
				return _startDetector();
			}
 	}
 }();