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/*!
 * Theia Sticky Sidebar v1.2.2
 * https://github.com/WeCodePixels/theia-sticky-sidebar
 *
 * Glues your website's sidebars, making them permanently visible while scrolling.
 *
 * Copyright 2013-2014 WeCodePixels and other contributors
 * Released under the MIT license
 */

(function($) {
	$.fn.theiaStickySidebar = function(options) {
		var defaults = {
			'containerSelector': '',
			'additionalMarginTop': 0,
			'additionalMarginBottom': 0,
			'updateSidebarHeight': true,
			'minWidth': 0
		};
		options = $.extend(defaults, options);

		// Validate options
		options.additionalMarginTop = parseInt(options.additionalMarginTop) || 0;
		options.additionalMarginBottom = parseInt(options.additionalMarginBottom) || 0;
		
		// Add CSS
		$('head').append($('<style>.theiaStickySidebar:after {content: ""; display: table; clear: both;}</style>'));

		this.each(function() {
			var o = {};
			o.sidebar = $(this);

			// Save options
			o.options = options || {};

			// Get container
			o.container = $(o.options.containerSelector);
			if (o.container.size() == 0) {
				o.container = o.sidebar.parent();
			}

			// Create sticky sidebar
			o.sidebar.parents().css('-webkit-transform', 'none'); // Fix for WebKit bug - https://code.google.com/p/chromium/issues/detail?id=20574
			o.sidebar.css({
				'position': 'relative',
				'overflow': 'visible',
				// The "box-sizing" must be set to "content-box" because we set a fixed height to this element when the sticky sidebar has a fixed position.
				'-webkit-box-sizing': 'border-box',
				'-moz-box-sizing': 'border-box',
				'box-sizing': 'border-box'
			});
			
			// Get the sticky sidebar element. If none has been found, then create one.
			o.stickySidebar = o.sidebar.find('.theiaStickySidebar');
			if (o.stickySidebar.length == 0) {				
				o.sidebar.find('script').remove(); // Remove <script> tags, otherwise they will be run again on the next line.
				o.stickySidebar = $('<div>').addClass('theiaStickySidebar').append(o.sidebar.children());				
				o.sidebar.append(o.stickySidebar);
			}

			// Get existing top and bottom margins and paddings
			o.marginTop = parseInt(o.sidebar.css('margin-top'));
			o.marginBottom = parseInt(o.sidebar.css('margin-bottom'));
			o.paddingTop = parseInt(o.sidebar.css('padding-top'));
			o.paddingBottom = parseInt(o.sidebar.css('padding-bottom'));

			// Add a temporary padding rule to check for collapsable margins.
			var collapsedTopHeight = o.stickySidebar.offset().top;
			var collapsedBottomHeight = o.stickySidebar.outerHeight();
			o.stickySidebar.css('padding-top', 1);
			o.stickySidebar.css('padding-bottom', 1);
			collapsedTopHeight -= o.stickySidebar.offset().top;
			collapsedBottomHeight = o.stickySidebar.outerHeight() - collapsedBottomHeight - collapsedTopHeight;
			if (collapsedTopHeight == 0) {
				o.stickySidebar.css('padding-top', 0);
				o.stickySidebarPaddingTop = 0;
			}
			else {
				o.stickySidebarPaddingTop = 1;
			}
			
			if (collapsedBottomHeight == 0) {
				o.stickySidebar.css('padding-bottom', 0);
				o.stickySidebarPaddingBottom = 0;
			}
			else {
				o.stickySidebarPaddingBottom = 1;
			}

			// We use this to know whether the user is scrolling up or down.
			o.previousScrollTop = null;

			// Scroll top (value) when the sidebar has fixed position.
			o.fixedScrollTop = 0;
			
			// Set sidebar to default values.
			resetSidebar();

			o.onScroll = function(o) {
				// Stop if the sidebar isn't visible.
				if (!o.stickySidebar.is(":visible")) {
					return;
				}				
				
				// Stop if the window is too small.
				if ($('body').width() < o.options.minWidth) {
					resetSidebar();
					return;					
				}

				// Stop if the sidebar width is larger than the container width (e.g. the theme is responsive and the sidebar is now below the content)
				if (o.sidebar.outerWidth(true) + 50 >  o.container.width()) {
					resetSidebar();
					return;
				}

				var scrollTop = $(document).scrollTop();
				var position = 'static';

				// If the user has scrolled down enough for the sidebar to be clipped at the top, then we can consider changing its position.
				if (scrollTop >= o.container.offset().top + (o.paddingTop + o.marginTop - o.options.additionalMarginTop)) {
					// The top and bottom offsets, used in various calculations.
					var offsetTop = o.paddingTop + o.marginTop + options.additionalMarginTop;
					var offsetBottom =  o.paddingBottom + o.marginBottom + options.additionalMarginBottom;
					
					// All top and bottom positions are relative to the window, not to the parent elemnts.
					var containerTop = o.container.offset().top;
					var containerBottom = o.container.offset().top + getClearedHeight(o.container);
					
					// The top and bottom offsets relative to the window screen top (zero) and bottom (window height).
					var windowOffsetTop = 0 + options.additionalMarginTop;
					var windowOffsetBottom;
					
					var sidebarSmallerThanWindow = (o.stickySidebar.outerHeight() + offsetTop + offsetBottom) < $(window).height();
					if (sidebarSmallerThanWindow) {
						windowOffsetBottom = windowOffsetTop + o.stickySidebar.outerHeight();
					}
					else {
						windowOffsetBottom = $(window).height() - o.marginBottom - o.paddingBottom - options.additionalMarginBottom;
					}
					
					var staticLimitTop = containerTop - scrollTop + o.paddingTop + o.marginTop;
					var staticLimitBottom = containerBottom - scrollTop - o.paddingBottom - o.marginBottom;

					var top = o.stickySidebar.offset().top - scrollTop;
					var scrollTopDiff = o.previousScrollTop - scrollTop;
					
					// If the sidebar position is fixed, then it won't move up or down by itself. So, we manually adjust the top coordinate.
					if (o.stickySidebar.css('position') == 'fixed') {
						top += scrollTopDiff;
					}
					
					if (scrollTopDiff > 0) { // If the user is scrolling up.
						top = Math.min(top, windowOffsetTop);
					}
					else { // If the user is scrolling down.
						top = Math.max(top, windowOffsetBottom - o.stickySidebar.outerHeight());
					}

					top = Math.max(top, staticLimitTop);

					top = Math.min(top, staticLimitBottom - o.stickySidebar.outerHeight());
					
					// If the sidebar is the same height as the container, we won't use fixed positioning.
					var sidebarSameHeightAsContainer = o.container.height() == o.stickySidebar.outerHeight();
					
					if (!sidebarSameHeightAsContainer && top == windowOffsetTop) {
						position = 'fixed';
					}
					else if (!sidebarSameHeightAsContainer && top == windowOffsetBottom - o.stickySidebar.outerHeight()) {
						position = 'fixed';
					}
					else if (scrollTop + top - o.sidebar.offset().top - o.paddingTop <= options.additionalMarginTop) {
						position = 'static';
					}
					else {
						position = 'absolute';
					}
				}

				/*
				 * Performance notice: It's OK to set these CSS values at each resize/scroll, even if they don't change.
				 * It's way slower to first check if the values have changed.
				 */
				if (position == 'fixed') {
					o.stickySidebar.css({
						'position': 'fixed',
						'width': o.sidebar.width(),
						'top': top,
						'left': o.sidebar.offset().left + parseInt(o.sidebar.css('padding-left'))  + parseInt(o.sidebar.css('border-left'))
					});
				}
				else if (position == 'absolute') {
					var css = {};

					if (o.stickySidebar.css('position') != 'absolute') {
						css.position = 'absolute';
						css.top = scrollTop + top - o.sidebar.offset().top - o.stickySidebarPaddingTop - o.stickySidebarPaddingBottom;
					}

					css.width = o.sidebar.width();
					css.left = '';

					o.stickySidebar.css(css);
				}
				else if (position == 'static') {
					resetSidebar();
				}

				if (position != 'static') {
					if (o.options.updateSidebarHeight == true) {
						o.sidebar.css({
							'min-height': o.stickySidebar.outerHeight() + o.stickySidebar.offset().top - o.sidebar.offset().top + o.paddingBottom
						});
					}
				}
				
				o.previousScrollTop = scrollTop;
			};

			// Initialize the sidebar's position.
			o.onScroll(o);

			// Recalculate the sidebar's position on every scroll and resize.
			$(document).scroll(function(o) {
				return function() {
					o.onScroll(o);
				};
			}(o));
			$(window).resize(function(o) {
				return function() {
					o.stickySidebar.css({'position': 'static'});
					o.onScroll(o);
				};
			}(o));

			// Reset the sidebar to its default state
			function resetSidebar() {
				o.fixedScrollTop = 0;
				o.sidebar.css({
					'min-height': '1px'
				});
				o.stickySidebar.css({
					'position': 'static',
					'width': ''
				});
			}

			// Get the height of a div as if its floated children were cleared. Note that this function fails if the floats are more than one level deep.
			function getClearedHeight(e) {
				var height = e.height();

				e.children().each(function() {
					height = Math.max(height, $(this).height());
				});

				return height;
			}
		});
	}
})(jQuery);