/*!
 * jQuery DG Magnet Combo 1.1
 * http://www.digitss.com/
 * http://blogs.digitss.com/projects/jquery-plugins/
 *
 * Uses and works with jQuery.js
 * http://jquery.com/
 * Copyright 2011, DiGiTSS
 * Released under the MIT, BSD, and GPL Licenses.
 *
 * Initial Release Date: Mon Jan 26 2011
 * Last Updated Date: Sat Feb 12 2011
 */
// TODO: Make it work with Shift key naturally
jQuery.fn.extend({
dgMagnetCombo: function()
{
	var bControlPress; // Maintain Control state	
	$(this).data("dgVal", $(this).val() || []); // Set selected values on load if any (reported by fflavio)
	$(this).click( function()
	{
		var sTop	=	this.scrollTop;
		var oVal	=	$(this).data("dgVal") || [];
		var nVal	=	$(this).val();

		if(bControlPress != true)
		{			
			if(nVal.length > 0)
			{
				var cValIndex = $.inArray(nVal[0],oVal);
				if(cValIndex > -1)
				{
					oVal.splice(cValIndex,1);
				}
				else
				{
					oVal.push(nVal[0]);
				}
			}
			$(this).data("dgVal",oVal).val(oVal);
		}
		else
		{	// This makes it work with CTL key
			if(oVal.length > 0)
			{	
				$.each(oVal, function(index, value){
					if($.inArray(value, nVal) < 0)
					{
						oVal.splice(index, 1);
					}
				});
				$(this).data("dgVal",oVal);
			}
		}
		this.scrollTop = sTop;
		return false;
	});

	$(this).keydown(function(e)
	{
		if(e.which == 17 || e.which == 16)	// CTL, Shift Key check
		{
			bControlPress = true;
		}
		return true;
	});
	
	$(this).keyup( function(e)
	{
		var sTop	=	this.scrollTop;
		if(e.which == 17 || e.which == 16)	// CTL, Shift Key check
		{
			var oVal = $(this).data("dgVal") || [];
			if(oVal.length > 0)
			{
				$.each($(this).val(), function(index, value)
				{
					if($.inArray(value, oVal) < 0)
					{
						oVal.push(value);
					}
				});
				$(this).val(oVal);
			}
			bControlPress = false;
		}
		else
		{
			if(!(e.which >= 37 && e.which <= 40))	// To make Up and Down arrow work
			{
				$(this).click();
			}
			else
			{
				$(this).val($(this).data("dgVal"));
			}
		}
		this.scrollTop = sTop;
		return false;
	});
}
});