/**
 * 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;
      //debAlert(e.stopPropagation);
      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: '/include/wndctrl/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);