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/*
 * jQuery ifixpng plugin
 * (previously known as pngfix)
 * Version 2.1  (23/04/2008)+jquery1.9fix
 * @requires jQuery v1.1.3 or above
 *
 * Examples at: http://jquery.khurshid.com
 * Copyright (c) 2007 Kush M.
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 */
 
 /**
  *
  * @example
  *
  * optional if location of pixel.gif if different to default which is images/pixel.gif
  * $.ifixpng('media/pixel.gif');
  *
  * $('img[@src$=.png], #panel').ifixpng();
  *
  * @apply hack to all png images and #panel which icluded png img in its css
  *
  * @name ifixpng
  * @type jQuery
  * @cat Plugins/Image
  * @return jQuery
  * @author jQuery Community
  */
 
(function($) {

        /**
         * helper variables and function
         */
        $.ifixpng = function(customPixel) {
                if (customPixel !== undefined) {
                    $.ifixpng.pixel = customPixel;
                }
        };
        
        $.ifixpng.getPixel = function() {
                return $.ifixpng.pixel || 'images/pixel.gif';
        };

        var hack = {
                ltie7  : (navigator.userAgent.match(/MSIE ((5\.5)|(6\.))/) !== null),
                filter : function(src) {
                        return "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true,sizingMethod=scale,src='"+src+"')";
                }
        };
        
        /**
         * Applies ie png hack to selected dom elements
         *
         * $('img[@src$=.png]').ifixpng();
         * @desc apply hack to all images with png extensions
         *
         * $('#panel, img[@src$=.png]').ifixpng();
         * @desc apply hack to element #panel and all images with png extensions
         *
         * @name ifixpng
         */
        
        $.fn.ifixpng =  hack.ltie7 ? function(customPixel) {
            if (customPixel !== undefined) {
                $.ifixpng.pixel = customPixel;
            }
        return this.each(function() {

            var filter = $(this).css('filter');
            if (!filter.match(/src=["']?(.*\.png([?].*)?)["']?/i)) { // if not yet executed
                        // in case rewriting urls
                        var base = $('base').attr('href');
                        if (base) {
                                // remove anything after the last '/'
                                base = base.replace(/\/[^\/]+$/,'/');
                            }
                        if ($(this).is('img') || $(this).is('input')) { // hack image tags present in dom
                                if ($(this).attr('src')) {
                                        if ($(this).attr('src').match(/.*\.png([?].*)?$/i)) { // make sure it is png image
                                                // use source tag value if set 
                                                var source = (base && $(this).attr('src').search(/^(\/|http:)/i)) ? base + $(this).attr('src') : $(this).attr('src');
                                                // apply filter
                                                $(this).css({filter:hack.filter(source), width:$(this).width(), height:$(this).height()})
                                                  .attr({src:$.ifixpng.getPixel()})
                                                  .positionFix();
                                        }
                                }
                        } else { // hack png css properties present inside css
                                var image = $(this).css('backgroundImage');
                                if (image.match(/^url\(["']?(.*\.png([?].*)?)["']?\)$/i)) {
                                        image = RegExp.$1;
                                        image = (base && image.substring(0,1)!='/') ? base + image : image;
                                        $(this).css({backgroundImage:'none', filter:hack.filter(image)})
                                          .children().children().positionFix();
                                }
                            }
                    }
                });
        } : function() { return this; };
        
        /**
         * Removes any png hack that may have been applied previously
         *
         * $('img[@src$=.png]').iunfixpng();
         * @desc revert hack on all images with png extensions
         *
         * $('#panel, img[@src$=.png]').iunfixpng();
         * @desc revert hack on element #panel and all images with png extensions
         *
         * @name iunfixpng
         */
         
        $.fn.iunfixpng = hack.ltie7 ? function() {
        return this.each(function() {
                        var src = $(this).css('filter');
                        if (src.match(/src=["']?(.*\.png([?].*)?)["']?/i)) { // get img source from filter
                                src = RegExp.$1;
                                if ($(this).is('img') || $(this).is('input')) {
                                        $(this).attr({src:src}).css({filter:''});
                                } else {
                                        $(this).css({filter:'', background:'url('+src+')'});
                                }
                        }
                });
        } : function() { return this; };
        
        /**
         * positions selected item relatively
         */
         
        $.fn.positionFix = function() {
                return this.each(function() {
                        var position = $(this).css('position');
                        if (position != 'absolute' && position != 'relative') {
                                $(this).css({position:'relative'});
                        }
                });
        };

})(jQuery);