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/*
* jQuery ifixpng plugin
* (previously known as pngfix)
* Version 2.0  (04/11/2007)
* @requires jQuery v1.1.3 or above
*
* Examples at: <a href="http://jquery.khurshid.com" >http://jquery.khurshid.com</a>
* Copyright (c) 2007 Kush M.
* Dual licensed under the MIT and GPL licenses:
* <a href="http://www.opensource.org/licenses/mit-license.php" >http://www.opensource.org/licenses/mit-license.php</a>
* <a href="http://www.gnu.org/licenses/gpl.html" >http://www.gnu.org/licenses/gpl.html</a>
*/

/**
*
* @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) {
$.ifixpng.pixel = customPixel;
};

$.ifixpng.getPixel = function() {
return $.ifixpng.pixel || 'images/pixel.gif';
};

var hack = {
ltie7  : $.browser.msie && $.browser.version < 7,
filter : function(src) {
return "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true,sizingMethod=crop,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() {
return this.each(function() {
var $$ = $(this);
var base = $('base').attr('href'); // need to use this in case you are using rewriting urls
if ($$.is('img') || $$.is('input')) { // hack image tags present in dom
if ($$.attr('src')) {
if ($$.attr('src').match(/.*.png([?].*)?$/i)) { // make sure it is png image
// use source tag value if set
var source = (base && $$.attr('src').substring(0,1)!='/') ? base + $$.attr('src') : $$.attr('src');
// apply filter
$$.css({filter:hack.filter(source), width:$$.width(), height:$$.height()})
.attr({src:$.ifixpng.getPixel()})
.positionFix();
}
}
} else { // hack png css properties present inside css
var image = $$.css('backgroundImage');
if (image.match(/^url(["']?(.*.png([?].*)?)["']?)$/i)) {
image = RegExp.$1;
$$.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 $$ = $(this);
var src = $$.css('filter');
if (src.match(/src=["']?(.*.png([?].*)?)["']?/i)) { // get img source from filter
src = RegExp.$1;
if ($$.is('img') || $$.is('input')) {
$$.attr({src:src}).css({filter:''});
} else {
$$.css({filter:'', background:'url('+src+')'});
}
}
});
} : function() { return this; };

/**
* positions selected item relatively
*/

$.fn.positionFix = function() {
return this.each(function() {
var $$ = $(this);
var position = $$.css('position');
if (position != 'absolute' && position != 'relative') {
$$.css({position:'relative'});
}
});
};

})(jQuery);

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