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thansen pushed a commit to branch master
in repository aseprite.

commit 2a007bffb9391e0e6901e3eca4f1b1e13a107e47
Author: David Capello <[email protected]>
Date:   Mon Apr 11 12:59:51 2016 -0300

    Update Editor::onMouseWheel() to use precise wheel as a touch device 
(scroll by default)
    
    On OS X, when we receive a precise wheel event, it means that the user
    has pressed a touch-like device (trackpad, magic mouse, wacom tablet),
    so he can scroll by default with the device (it's not a real mouse wheel).
    The zoom can be done with the pinch gesture.
---
 src/app/ui/editor/state_with_wheel_behavior.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/app/ui/editor/state_with_wheel_behavior.cpp 
b/src/app/ui/editor/state_with_wheel_behavior.cpp
index d30aae4..f1f8ec4 100644
--- a/src/app/ui/editor/state_with_wheel_behavior.cpp
+++ b/src/app/ui/editor/state_with_wheel_behavior.cpp
@@ -47,12 +47,14 @@ bool StateWithWheelBehavior::onMouseWheel(Editor* editor, 
MouseMessage* msg)
     else
       wheelAction = WHEEL_FG;
   }
-  // Normal behavior: mouse wheel zooms
-  else if (Preferences::instance().editor.zoomWithWheel()) {
+  // Normal behavior: mouse wheel zooms If the message is from a
+  // precise wheel i.e. a trackpad/touch-like device, we scroll by
+  // default.
+  else if (Preferences::instance().editor.zoomWithWheel() &&
+           !msg->preciseWheel()) {
     if (msg->ctrlPressed())
       wheelAction = WHEEL_FRAME;
-    else if ((msg->wheelDelta().x != 0 && !msg->preciseWheel()) ||
-             (msg->shiftPressed()))
+    else if (msg->wheelDelta().x != 0 || msg->shiftPressed())
       wheelAction = WHEEL_HSCROLL;
     else
       wheelAction = WHEEL_ZOOM;

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