From 11e5ddc77a7927305f20016cf507791050837aca Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lech=20Wilczy=C5=84ski?= <lech.wilczynski@gmail.com>
Date: Thu, 12 Jan 2012 12:08:21 +0100
Subject: [PATCH] Added mouse wheel event listener to select next slide

---
 js/impress.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/js/impress.js b/js/impress.js
index dfbaaef..8b626b7 100644
--- a/js/impress.js
+++ b/js/impress.js
@@ -306,6 +306,12 @@
         }
     });
     
+    document.addEventListener("mousewheel", function( event ) {        
+        next = steps.indexOf( active ) - event.wheelDelta / Math.abs(event.wheelDelta);
+        next = next >= 0 ? steps[ next ] : steps[ steps.length-1 ];
+        select(next);
+    }, false); 
+    
     var getElementFromUrl = function () {
         // get id from url # by removing `#` or `#/` from the beginning,
         // so both "fallback" `#slide-id` and "enhanced" `#/slide-id` will work