From: Stefan Csomor <csomor@advancedconcepts.ch>
Date: Thu, 11 Jul 2013 19:31:21 +0000 (+0000)
Subject: adapt to wx conventions for scroll wheel differences between horizontal and vertical... 
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/5b0c463561f25eba690cea7026a06319be8fd00b?ds=sidebyside

adapt to wx conventions for scroll wheel differences between horizontal and vertical directions, fixes #15269

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74487 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/src/osx/cocoa/window.mm b/src/osx/cocoa/window.mm
index 3465cdbc40..a12de97681 100644
--- a/src/osx/cocoa/window.mm
+++ b/src/osx/cocoa/window.mm
@@ -687,8 +687,11 @@ void wxWidgetCocoaImpl::SetupMouseEvent( wxMouseEvent &wxevent , NSEvent * nsEve
                 
             if ( fabs(deltaX) > fabs(deltaY) )
             {
+                // wx conventions for horizontal are inverted from vertical (originating from native msw behavior)
+                // right and up are positive values, left and down are negative values, while on OSX right and down
+                // are negative and left and up are positive.
                 wxevent.m_wheelAxis = wxMOUSE_WHEEL_HORIZONTAL;
-                wxevent.m_wheelRotation = (int)deltaX;
+                wxevent.m_wheelRotation = -(int)deltaX;
             }
             else
             {