/*-------------------------------------------------------------------- 
Utility functions
Version: 1.0, 01.18.2008

By: Maggie Costello Wachs (maggie@filamentgroup.com)
	http://www.filamentgroup.com
		
Copyright (c) 2007 Filament Group
Licensed under GPL (http://www.opensource.org/licenses/gpl-license.php)

Dependencies:
	jQuery library
--------------------------------------------------------------------*/

function sortBigToSmall(a, b) { return b - a; };

function getScrollTop(){
	return self.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop;
};

function getScrollLeft(){
	return self.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft;
};

function getWindowHeight(){
	var de = document.documentElement;
	return self.innerHeight || (de && de.clientHeight) || document.body.clientHeight;
};

function getWindowWidth(){
	var de = document.documentElement;
	return self.innerWidth || (de && de.clientWidth) || document.body.clientWidth;
};

// getTotalWidth/Height finds the width/height of an element including padding
jQuery.fn.getTotalWidth = function(){
	return $(this).width() + parseInt($(this).css('paddingRight')) + parseInt($(this).css('paddingLeft'));
};

jQuery.fn.getTotalHeight = function(){
	return $(this).height() + parseInt($(this).css('paddingTop')) + parseInt($(this).css('paddingBottom'));
};

// assign random ids to a single element or a group of child elements
jQuery.fn.setRandomId = function(settings){
	var settings = jQuery.extend({
		children: null, // selectors for child elements (acts only on the caller element by default)
		attribute: null // attribute, if not id (default)
	}, settings);
	
	var thisAttr = settings.attribute || 'id';
		
	var setId = function(el){
		var newId = 'id_' + Math.floor(Math.random()*9999);
		el.attr(thisAttr, newId);
	};
	
	if (settings.children) {
		$(this).find(settings.children).each(setId($(this)));
	}
	else { setId($(this)); }
	
	return $(this);
};

// Test to see if this element will fit in the viewport
/* Parameters:
	@el = element to position, required
	@leftOffset / @topOffset = optional parameter if the offset cannot be calculated (i.e., if the object is in the DOM but is set to display: 'none')
*/
function fitHorizontal(el, leftOffset){
	var leftVal = parseInt(leftOffset) || $(el).offset().left;
	return (leftVal + $(el).width() <= getWindowWidth() + getScrollLeft() && leftVal - getScrollLeft() >= 0);
};

function fitVertical(el, topOffset){
	var topVal = parseInt(topOffset) || $(el).offset().top;
	return (topVal + $(el).height() <= getWindowHeight() + getScrollTop() && topVal - getScrollTop() >= 0);
};