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/*
* Supposition v0.3a - an optional enhancer for Superfish jQuery menu widget
*
* Copyright (c) 2013 Joel Birch - based on work by Jesse Klaasse - credit goes largely to him.
* Special thanks to Karl Swedberg for valuable input.
*
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
*/
;(function($){
$.fn.supposition = function(){
var $w = $(window), /*do this once instead of every onBeforeShow call*/
_offset = function(dir) {
return window[dir == 'y' ? 'pageYOffset' : 'pageXOffset']
|| document.documentElement && document.documentElement[dir=='y' ? 'scrollTop' : 'scrollLeft']
|| document.body[dir=='y' ? 'scrollTop' : 'scrollLeft'];
},
onInit = function(){
/* I haven't touched this bit - needs work as there are still z-index issues */
$topNav = $('li',this);
var cZ=parseInt($topNav.css('z-index')) + $topNav.length;
$topNav.each(function() {
$(this).css({zIndex:--cZ});
});
},
onHide = function(){
this.css({marginTop:'',marginLeft:''});
},
onBeforeShow = function(){
this.each(function(){
var $u = $(this);
$u.css('display','block');
var menuWidth = $u.width(),
parentWidth = $u.parents('ul').width(),
totalRight = $w.width() + _offset('x'),
menuRight = $u.offset().left + menuWidth;
if (menuRight > totalRight) {
$u.css('margin-left', ($u.parents('ul').length == 1 ? totalRight - menuRight : -(menuWidth + parentWidth)) + 'px');
}
var windowHeight = $w.height(),
offsetTop = $u.offset().top,
menuHeight = $u.height(),
baseline = windowHeight + _offset('y');
var expandUp = (offsetTop + menuHeight > baseline);
if (expandUp) {
$u.css('margin-top',baseline - (menuHeight + offsetTop));
}
$u.css('display','none');
});
};
return this.each(function() {
var $this = $(this),
o = $this.data('sf-options'); /* get this menu's options */
/* if callbacks already set, store them */
var _onInit = o.onInit,
_onBeforeShow = o.onBeforeShow,
_onHide = o.onHide;
$.extend($this.data('sf-options'),{
onInit: function() {
onInit.call(this); /* fire our Supposition callback */
_onInit.call(this); /* fire stored callbacks */
},
onBeforeShow: function() {
onBeforeShow.call(this); /* fire our Supposition callback */
_onBeforeShow.call(this); /* fire stored callbacks */
},
onHide: function() {
onHide.call(this); /* fire our Supposition callback */
_onHide.call(this); /* fire stored callbacks */
}
});
});
};
})(jQuery);