GuaranaUI/lib/jquery/ui.core.position.js

;(function($) {
	
	$.fn.extend({

		scrollParent: function() {
	
			var scrollParent;
			if(($.browser.msie && (/(static|relative)/).test(this.css('position'))) || (/absolute/).test(this.css('position'))) {
				scrollParent = this.parents().filter(function() {
					return (/(relative|absolute|fixed)/).test($.curCSS(this,'position',1)) && (/(auto|scroll)/).test($.curCSS(this,'overflow',1)+$.curCSS(this,'overflow-y',1)+$.curCSS(this,'overflow-x',1));
				}).eq(0);
			} else {
				scrollParent = this.parents().filter(function() {
					return (/(auto|scroll)/).test($.curCSS(this,'overflow',1)+$.curCSS(this,'overflow-y',1)+$.curCSS(this,'overflow-x',1));
				}).eq(0);
			}
	
			return (/fixed/).test(this.css('position')) || !scrollParent.length ? $(document) : scrollParent;
		}
	
	});
	
	$.fn.positionAround = function(event, o) {
	
		var options = $.extend({
			around: 'mouse',
			direction: 'default',
			forceDirection: false,
			offset: [0, 0]
		}, o);
	
		var leftOffset	= 0,
			topOffset	= 0,
			height		= this[0].offsetHeight,
			width		= this[0].offsetWidth,
			op			= this.offsetParent(),
			sp			= $(this.scrollParent().length ? this.scrollParent() : document.body),
			spBorderTop = parseInt(op.css('borderTopWidth'),10),
			spBorderLeft= parseInt(op.css('borderLeftWidth'),10),
			opBorderTop = parseInt(op.css('borderTopWidth'),10),
			opBorderLeft= parseInt(op.css('borderLeftWidth'),10),
			opOffset	= op.offset()
			//spOffset	= sp.offset()
		;
	
		//Ugly fix for the issues of offset related to the body element
		opOffset = (/(html|body)/).test(op[0].tagName.toLowerCase()) ? { top: 0, left: 0 } : opOffset;
		spOffset = (/(html|body)/).test(op[0].tagName.toLowerCase()) ? { top: 0, left: 0 } : spOffset;
	
		var bottomEdge = (/(html|body)/).test(op[0].tagName.toLowerCase()) ? $(window).height() : spOffset.top + spBorderTop + sp.height();
		var rightEdge = (/(html|body)/).test(op[0].tagName.toLowerCase()) ? $(window).width() : spOffset.left + spBorderLeft + sp.width();
	
		if($(options.around).length && $(options.around)[0].nodeName) { //If around is an element
	
			var element = $(options.around),
				offset = element.offset(),
				relHeight = element[0].offsetHeight,
				relWidth = element[0].offsetWidth
			;
	
			if((/(left|right)/).test(options.direction)) {
	
				leftOffset = ( options.direction == 'left' ? (offset.left - spOffset.left - spBorderLeft > width || options.forceDirection) : (rightEdge-offset.left-relWidth < width && !options.forceDirection) ) ? -(width) : relWidth;
				topOffset = event ? ( bottomEdge - offset.top < height ? -(height-relHeight) : 0 ) : 0;
			} else {
				topOffset = ( options.direction == 'above' ? (offset.top - spOffset.top - spBorderTop  > height || options.forceDirection) : (bottomEdge-offset.top-relHeight < height && !options.forceDirection) ) ? -(height) : relHeight;
			}
	
			this.css({
				left: offset.left - opOffset.left - opBorderLeft + leftOffset + options.offset[0],
				top: offset.top - opOffset.top - opBorderTop + topOffset + options.offset[1]
			});
	
		} else {
	
			if((/(below|default)/).test(options.direction)) {
				topOffset = bottomEdge - event.pageY < height && !options.forceDirection ? -(height) : 0;
			} else if ((/above/).test(options.direction)) {
				topOffset = (event.pageY - spOffset.top - spBorderTop) > height || options.forceDirection ? -(height) : 0;
			}
	
			if((/(right|default)/).test(options.direction)) {
				leftOffset = rightEdge - event.pageX < width && !options.forceDirection ? -(width) : 0;
			} else if ((/left/).test(options.direction)) {
				leftOffset = (event.pageX - spOffset.left - spBorderLeft) > width || options.forceDirection ? -(width) : 0;
			}
	
			this.css({
				left: event.pageX - opOffset.left - opBorderLeft + leftOffset + options.offset[0],
				top: event.pageY - opOffset.top - opBorderTop + topOffset + options.offset[1]
			});
	
		}
	
	};
	
})(jQuery);