Attempt to better handle multiple devices that give a different

lowestDelta value

Author: brandonaaron

jquery.mousewheel.js

@@ -23,7 +23,7 @@
         toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
                     ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
         slice  = Array.prototype.slice,
-        lowestDelta;
+        nullLowestDeltaTimeout, lowestDelta;
 
     if ( $.event.fixHooks ) {
         for ( var i = toFix.length; i; ) {
@@ -116,7 +116,18 @@
         // Add event and delta to the front of the arguments
         args.unshift(event, delta, deltaX, deltaY);
 
+        // Clearout lowestDelta after sometime to better
+        // handle multiple device types that give different
+        // a different lowestDelta
+        // Ex: trackpad = 3 and mouse wheel = 120
+        if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
+        nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
+
         return ($.event.dispatch || $.event.handle).apply(this, args);
     }
 
+    function nullLowestDelta() {
+      lowestDelta = null;
+    }
+
 }));