/**
 * 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 1.1.0 Beta
 * @author Khavilo Dmitry
 * @mailto wm.morgun@gmail.com
**/

(function($){

  $.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: 'lib/jquery-checkbox.1.1.0b2/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;
    }
    /* Wrapping all passed elements */
    return this.each(function()
    {
      var ch = this;
      var $ch = addEvents(ch); /* Adds custom eents and returns */

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

      /* Creating div 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');
      ch.wrapper.hover(
        function() { ch.wrapperInner.addClass(settings.cls + '-hover'); },
        function() { ch.wrapperInner.removeClass(settings.cls + '-hover'); }
      );

      /* Wrapping checkbox */
      $ch.css({position: 'absolute', zIndex: -1}).after(ch.wrapper);

      /* Fixing IE6 label behaviour */
      var parents = $ch.parents('label');
      /* Creating "click" event handler for checkbox wrapper*/
      if ( parents.length )
      {
        parents.click(function(e) { $ch.trigger('click', [e]); return ( $.browser.msie && $.browser.version < 7 ); });
      }
      else
      {
        ch.wrapper.click(function(e) { $ch.trigger('click', [e]); });
      }

      delete parents;

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

      /* Firefox div 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);