Bootstrap 3.1.0

assets/js/plugins/bootstrap/affix.js

@@ -1,24 +1,14 @@
 /* ========================================================================
- * Bootstrap: affix.js v3.0.3
+ * Bootstrap: affix.js v3.1.0
  * http://getbootstrap.com/javascript/#affix
  * ========================================================================
- * Copyright 2013 Twitter, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2011-2014 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * ======================================================================== */
 
 
-+function ($) { "use strict";
++function ($) {
+  'use strict';
 
   // AFFIX CLASS DEFINITION
   // ======================
@@ -29,9 +19,10 @@
       .on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
       .on('click.bs.affix.data-api',  $.proxy(this.checkPositionWithEventLoop, this))
 
-    this.$element = $(element)
-    this.affixed  =
-    this.unpin    = null
+    this.$element     = $(element)
+    this.affixed      =
+    this.unpin        =
+    this.pinnedOffset = null
 
     this.checkPosition()
   }
@@ -42,6 +33,14 @@
     offset: 0
   }
 
+  Affix.prototype.getPinnedOffset = function () {
+    if (this.pinnedOffset) return this.pinnedOffset
+    this.$element.removeClass(Affix.RESET).addClass('affix')
+    var scrollTop = this.$window.scrollTop()
+    var position  = this.$element.offset()
+    return (this.pinnedOffset = position.top - scrollTop)
+  }
+
   Affix.prototype.checkPositionWithEventLoop = function () {
     setTimeout($.proxy(this.checkPosition, this), 1)
   }
@@ -56,9 +55,11 @@
     var offsetTop    = offset.top
     var offsetBottom = offset.bottom
 
+    if (this.affixed == 'top') position.top += scrollTop
+
     if (typeof offset != 'object')         offsetBottom = offsetTop = offset
-    if (typeof offsetTop == 'function')    offsetTop    = offset.top()
-    if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
+    if (typeof offsetTop == 'function')    offsetTop    = offset.top(this.$element)
+    if (typeof offsetBottom == 'function') offsetBottom = offset.bottom(this.$element)
 
     var affix = this.unpin   != null && (scrollTop + this.unpin <= position.top) ? false :
                 offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :
@@ -67,13 +68,23 @@
     if (this.affixed === affix) return
     if (this.unpin) this.$element.css('top', '')
 
-    this.affixed = affix
-    this.unpin   = affix == 'bottom' ? position.top - scrollTop : null
+    var affixType = 'affix' + (affix ? '-' + affix : '')
+    var e         = $.Event(affixType + '.bs.affix')
 
-    this.$element.removeClass(Affix.RESET).addClass('affix' + (affix ? '-' + affix : ''))
+    this.$element.trigger(e)
+
+    if (e.isDefaultPrevented()) return
+
+    this.affixed = affix
+    this.unpin = affix == 'bottom' ? this.getPinnedOffset() : null
+
+    this.$element
+      .removeClass(Affix.RESET)
+      .addClass(affixType)
+      .trigger($.Event(affixType.replace('affix', 'affixed')))
 
     if (affix == 'bottom') {
-      this.$element.offset({ top: document.body.offsetHeight - offsetBottom - this.$element.height() })
+      this.$element.offset({ top: scrollHeight - offsetBottom - this.$element.height() })
     }
   }