Correct scrolling direction when using Sliders

Account for OS X "direct"/"inverted"/"australian"
scrolling.
This ensures that a touchpad right/left/up/down flick will move the
slider handle in the same direction as the flick.
This takes advantage of the recent addition of QWheelEvent::inverted
in qtbase

Change-Id: If51ec6f0cbc12a042a92aa55964633c9521469a9
Task-number: QTBUG-35972
Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/controls/Slider.qml b/src/controls/Slider.qml
index 1a34c049..f38db0e4 100644
--- a/src/controls/Slider.qml
+++ b/src/controls/Slider.qml
@@ -317,14 +317,14 @@ Control {
         onVerticalWheelMoved: {
             if (verticalDelta !== 0) {
                 var delta = Math.abs(verticalDelta)*step > stepSize ? verticalDelta*step : verticalDelta/Math.abs(verticalDelta)*stepSize
-                value += delta
+                value -= delta * (inverted ? 1 : -1)
             }
         }
 
         onHorizontalWheelMoved: {
             if (horizontalDelta !== 0) {
                 var delta = Math.abs(horizontalDelta)*step > stepSize ? horizontalDelta*step : horizontalDelta/Math.abs(horizontalDelta)*stepSize
-                value += delta
+                value += delta * (inverted ? 1 : -1)
             }
         }
     }