From 6f12de62f9c80f5fdc5ffbdb1791557a7cbbc22c Mon Sep 17 00:00:00 2001
From: Tanner Netterville <tannern@gmail.com>
Date: Wed, 28 May 2014 16:59:26 -0500
Subject: [PATCH] Add shiftOnlyWheelScroll setting (default: true)

In this committer's view, sideways scrolling with the mouse wheel should require holding the shift key so as not to interfere with page scrolling especially for large gantt charts.
---
 js/jquery.fn.gantt.js | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/js/jquery.fn.gantt.js b/js/jquery.fn.gantt.js
index 077c91d..cd14ca7 100644
--- a/js/jquery.fn.gantt.js
+++ b/js/jquery.fn.gantt.js
@@ -46,7 +46,8 @@
             onItemClick: function (data) { return; },
             onAddClick: function (data) { return; },
             onRender: function() { return; },
-            scrollToToday: true
+            scrollToToday: true,
+            shiftOnlyWheelScroll: true
         };
 
         // custom selector `:findday` used to match on specified day in ms.
@@ -1181,7 +1182,7 @@
 				/*
 				 * Dependecies (temporary disabled)
 				 */
-				/*
+				/*
 				$.each(element.data, function(i, entry) {
 									$.each(entry.values, function(j, day) {
 										if (day.id && day.dep)
@@ -1390,7 +1391,7 @@
 											}
 										}
 									});
-								});*/
+								});*/
 				
             },
             // **Navigation**
@@ -1536,6 +1537,11 @@
 
             // Move chart via mousewheel
             wheelScroll: function (element, e) {
+                if (settings.shiftOnlyWheelScroll && !e.shiftKey) {
+                    // shift is not held down: break out
+                    return;
+                }
+                
                 var delta = e.detail ? e.detail * (-50) : e.wheelDelta / 120 * 50;
 
                 core.scrollPanel(element, delta);
@@ -1939,4 +1945,4 @@
         });
 
     };
-})(jQuery);
\ No newline at end of file
+})(jQuery);