[Qemu-devel] [PATCH v2] ui/cocoa.m: replace scrollingDeltaY with deltaY

[John Arbuckle <programmingkidx@gmail.com>]

The NSEvent class method scrollingDeltaY is available
for Mac OS 10.7 and newer. Since QEMU supports Mac OS
10.5 and up, we need to be using a method that is
available on these version of Mac OS X. The deltaY
method is a method that does the same thing as
scrollingDeltaY and is available on Mac OS 10.5 and
up. So we simply replace scrollingDeltaY with deltaY.

Signed-off-by: John Arbuckle <programmingkidx@gmail.com>
---
v2 changes:
- Added a condition that drops scroll events that have a deltaY value of zero.

 ui/cocoa.m | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/ui/cocoa.m b/ui/cocoa.m
index 2991ed4..f371469 100644
--- a/ui/cocoa.m
+++ b/ui/cocoa.m
@@ -802,14 +802,15 @@ QemuCocoaView *cocoaView;
              * This is in-line with standard Mac OS X UI behaviour.
              */
 
+            if ([event deltaY] != 0) {
             /* Determine if this is a scroll up or scroll down event */
-            buttons = ([event scrollingDeltaY] > 0) ?
-                INPUT_BUTTON_WHEEL_UP : INPUT_BUTTON_WHEEL_DOWN;
-            qemu_input_queue_btn(dcl->con, buttons, true);
-            qemu_input_event_sync();
-            qemu_input_queue_btn(dcl->con, buttons, false);
-            qemu_input_event_sync();
-
+                buttons = ([event deltaY] > 0) ?
+                    INPUT_BUTTON_WHEEL_UP : INPUT_BUTTON_WHEEL_DOWN;
+                qemu_input_queue_btn(dcl->con, buttons, true);
+                qemu_input_event_sync();
+                qemu_input_queue_btn(dcl->con, buttons, false);
+                qemu_input_event_sync();
+            }
             /*
              * Since deltaY also reports scroll wheel events we prevent mouse
              * movement code from executing.
-- 
2.7.2