/**
 * 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: ''  /* 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"><div /></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, display: 'none' }).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;
            }
            /* Label 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]).trigger('change'); CB(e); return false; });
            }
            ch.wrapper.click(function(e) { $ch.trigger('click', [e]).trigger('change'); 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'); });

            if ($.browser.mozilla) {//Firefox
                $ch.css('MozUserSelect', 'none');
            } else if ($.browser.msie) {//IE
            $ch.bind('selectstart', function() { return false; });
            } else {//Opera, etc.
            $ch.mousedown(function() { return false; });
            }

            /* Disable image drag-n-drop for IE */
            $('div', 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);