Bumping to 3.1.9. Including a fix for the broken bower.json in 3.1.8 and

updates to the old delta handling code.

ChangeLog.md

@@ -1,5 +1,11 @@
 # Mouse Wheel ChangeLog
 
+## 3.1.9
+
+* Fix bower.json file
+* Updated how the deltas are adjusted for older mousewheel based events that have deltas that are factors of 120.
+* Add $.event.special.mousewheel.settings.adjustOldDeltas (defaults to true) to turn off adjusting of old deltas that are factors of 120. You'd turn this off if you want to be as close to native scrolling as possible.
+
 ## 3.1.8
 
 * Even better handling of older browsers that use a wheelDelta based on 120

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "jquery-mousewheel",
-  "version": "3.1.8",
+  "version": "3.1.9",
   "main": "./jquery.mousewheel.js",
   "ignore": [
     "*.json",

jquery.mousewheel.js

@@ -1,7 +1,7 @@
 /*! Copyright (c) 2013 Brandon Aaron (http://brandon.aaron.sh)
  * Licensed under the MIT License (LICENSE.txt).
  *
- * Version: 3.1.8
+ * Version: 3.1.9
  *
  * Requires: jQuery 1.2.2+
  */
@@ -23,7 +23,7 @@
         toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
                     ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
         slice  = Array.prototype.slice,
-        oldMode, nullLowestDeltaTimeout, lowestDelta;
+        nullLowestDeltaTimeout, lowestDelta;
 
     if ( $.event.fixHooks ) {
         for ( var i = toFix.length; i; ) {
@@ -32,7 +32,7 @@
     }
 
     var special = $.event.special.mousewheel = {
-        version: '3.1.8',
+        version: '3.1.9',
 
         setup: function() {
             if ( this.addEventListener ) {
@@ -63,6 +63,10 @@
 
         getPageHeight: function(elem) {
             return $(elem).height();
+        },
+
+        settings: {
+            adjustOldDeltas: true
         }
     };
 
@@ -138,18 +142,14 @@
         if ( !lowestDelta || absDelta < lowestDelta ) {
             lowestDelta = absDelta;
 
-            // Assuming that if the lowestDelta is 120, then that the browser
-            // is treating this as an older mouse wheel event.
-            // We'll divide it by 40 to try and get a more usable deltaFactor.
-            if ( lowestDelta === 120 ) {
-                oldMode = true;
+            // Adjust older deltas if necessary
+            if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
                 lowestDelta /= 40;
             }
         }
 
-        // When in oldMode the delta is based on 120.
-        // Dividing by 40 to try and get a more usable deltaFactor.
-        if ( oldMode ) {
+        // Adjust older deltas if necessary
+        if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
             // Divide all the things by 40!
             delta  /= 40;
             deltaX /= 40;
@@ -185,7 +185,17 @@
 
     function nullLowestDelta() {
         lowestDelta = null;
-        oldMode = null;
+    }
+
+    function shouldAdjustOldDeltas(orgEvent, absDelta) {
+        // If this is an older event and the delta is divisable by 120,
+        // then we are assuming that the browser is treating this as an
+        // older mouse wheel event and that we should divide the deltas
+        // by 40 to try and get a more usable deltaFactor.
+        // Side note, this actually impacts the reported scroll distance
+        // in older browsers and can cause scrolling to be slower than native.
+        // Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
+        return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
     }
 
 }));

mousewheel.jquery.json

@@ -7,7 +7,7 @@
         "mouse",
         "event"
     ],
-    "version": "3.1.8",
+    "version": "3.1.9",
     "author": {
         "name": "Brandon Aaron",
         "url": "http://brandon.aaron.sh"