/**

 * jQuery custom checkboxes

 * 

 * Copyright (c) 2008 Khavilo Dmitry (http://widowmaker.kiev.ua/checkbox/)

 * Licensed under the MIT License:

 * http://www.opensource.org/licenses/mit-license.php

 *

 * @version 1.3.0 Beta 1

 * @author Khavilo Dmitry

 * @mailto wm.morgun@gmail.com

**/



(function($){

	/* Little trick to remove event bubbling that causes events recursion */

	var CB = function(e)

	{

		if (!e) var e = window.event;

		e.cancelBubble = true;

		if (e.stopPropagation) e.stopPropagation();

	};

	

	$.fn.checkbox = function(options) {

		/* IE6 background flicker fix */

		try	{ document.execCommand('BackgroundImageCache', false, true);	} catch (e) {}

		

		/* Default settings */

		var settings = {

			cls: 'jquery-checkbox',  /* checkbox  */

			empty: '/extension/institution/design/institution/images/backgrounds/empty.png'  /* checkbox  */

		};

		

		/* Processing settings */

		settings = $.extend(settings, options || {});

		

		/* Adds check/uncheck & disable/enable events */

		var addEvents = function(object)

		{

			var checked = object.checked;

			var disabled = object.disabled;

			var $object = $(object);

			

			if ( object.stateInterval )

				clearInterval(object.stateInterval);

			

			object.stateInterval = setInterval(

				function() 

				{

					if ( object.disabled != disabled )

						$object.trigger( (disabled = !!object.disabled) ? 'disable' : 'enable');

					if ( object.checked != checked )

						$object.trigger( (checked = !!object.checked) ? 'check' : 'uncheck');

				}, 

				10 /* in miliseconds. Low numbers this can decrease performance on slow computers, high will increase responce time */

			);

			return $object;

		};

		//try { console.log(this); } catch(e) {}

		

		/* Wrapping all passed elements */

		return this.each(function() 

		{

			var ch = this; /* Reference to DOM Element*/

			var $ch = addEvents(ch); /* Adds custom events and returns, jQuery enclosed object */

			

			/* Removing wrapper if already applied  */

			if (ch.wrapper) ch.wrapper.remove();

			

			/* Creating wrapper for checkbox and assigning "hover" event */

			ch.wrapper = $('<span class="' + settings.cls + '"><span class="mark"><img src="' + settings.empty + '" /></span></span>');

			ch.wrapperInner = ch.wrapper.children('span:eq(0)');

			ch.wrapper.hover(

				function(e) { ch.wrapperInner.addClass(settings.cls + '-hover');CB(e); },

				function(e) { ch.wrapperInner.removeClass(settings.cls + '-hover');CB(e); }

			);

			

			/* Wrapping checkbox */

			$ch.css({position: 'absolute', zIndex: -1, visibility: 'hidden'}).after(ch.wrapper);

			

			/* Ttying to find "our" label */

			var label = false;

			if ($ch.attr('id'))

			{

				label = $('label[for='+$ch.attr('id')+']');

				if (!label.length) label = false;

			}

			if (!label)

			{

				/* Trying to utilize "closest()" from jQuery 1.3+ */

				label = $ch.closest ? $ch.closest('label') : $ch.parents('label:eq(0)');

				if (!label.length) label = false;

			}

			/* Labe found, applying event hanlers */

			if (label)

			{

				label.hover(

					function(e) { ch.wrapper.trigger('mouseover', [e]); },

					function(e) { ch.wrapper.trigger('mouseout', [e]); }

				);

				label.click(function(e) { $ch.trigger('click',[e]); CB(e); return false;});

			}

			ch.wrapper.click(function(e) { $ch.trigger('click',[e]); CB(e); return false;});

			$ch.click(function(e) { CB(e); });

			$ch.bind('disable', function() { ch.wrapperInner.addClass(settings.cls+'-disabled');}).bind('enable', function() { ch.wrapperInner.removeClass(settings.cls+'-disabled');});

			$ch.bind('check', function() { ch.wrapper.addClass(settings.cls+'-checked' );}).bind('uncheck', function() { ch.wrapper.removeClass(settings.cls+'-checked' );});

			

			/* Disable image drag-n-drop for IE */

			$('img', ch.wrapper).bind('dragstart', function () {return false;}).bind('mousedown', function () {return false;});

			

			/* Firefox antiselection hack */

			if ( window.getSelection )

				ch.wrapper.css('MozUserSelect', 'none');

			

			/* Applying checkbox state */

			if ( ch.checked )

				ch.wrapper.addClass(settings.cls + '-checked');

			if ( ch.disabled )

				ch.wrapperInner.addClass(settings.cls + '-disabled');			

		});

	}

})(jQuery);