Refactored lib.

src/jquery.stickysectionheaders.js

@@ -0,0 +1,60 @@
+/*!
+ * Sticky Section Headers
+ *
+ * Copyright (c) 2010 Florian Plank (http://www.polarblau.com/)
+ * Dual licensed under the MIT (MIT-LICENSE.txt)
+ * and GPL (GPL-LICENSE.txt) licenses.
+ *
+ * USAGE:
+ * 
+ * $('#container').stickySectionHeaders({
+ *   stickyClass      : 'sticky',
+ *   headlineSelector : 'strong'
+ * });
+ *
+ */
+
+(function($){
+  $.fn.stickySectionHeaders = function(options) {
+
+    var settings = $.extend({
+      stickyClass     : 'sticky',
+      headlineSelector: 'strong'
+    }, options);
+
+    return $(this).each(function() {
+      var $this = $(this);
+      $(this).find('ul:first').bind('scroll.sticky', function(e) {
+        $(this).find('> li').each(function() {
+          var $this      = $(this),
+              top        = $this.position().top,
+              height     = $this.outerHeight(),
+              $head      = $this.find(settings.headlineSelector),
+              headHeight = $head.outerHeight();
+
+          if (top < 0) {
+            $this.addClass(settings.stickyClass).css('paddingTop', headHeight);
+            $head.css('top', (height + top < headHeight) ? (headHeight - (top + height)) * -1 : '' );
+          } else {
+            $this.removeClass(settings.stickyClass).css('paddingTop', '');
+          }
+        });
+      });
+    });
+  };
+
+  /* A little helper to calculate the sum of different
+   * CSS properties
+   *
+   * EXAMPLE:
+   * $('#my-div').cssSum('paddingLeft', 'paddingRight');
+   */
+  $.fn.cssSum = function() {
+    var $self = $(this), sum = 0;
+    $(arguments).each(function(i, e) {
+      sum += parseInt($self.css(e) || 0, 10);
+    });
+    return sum;
+  };
+
+})(jQuery);