QStyleAnimation: Go down to 15 fps

The new implementation of CE_ProgressBarContents in
QMacStyle uses NSProgressIndicator, which is noticeably
heavier than the previously used HITheme API. Setting
the animation frame rate to 20 fps improves things
significantly compared to the default 30 fps, but
Cocoa seems to update the animation at 15 fps for
indeterminate NSProgressIndicator. Going down to 12
or 10 fps may be an option in the future, but it's
not compatible with NSProgressIndicator.

Change-Id: Ie1e18d7d78d1bd7ea38a12d715a6a7db0e175a29
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/widgets/styles/qstyleanimation_p.h b/src/widgets/styles/qstyleanimation_p.h
index e5cfe0bbee..bb1ab9d877 100644
--- a/src/widgets/styles/qstyleanimation_p.h
+++ b/src/widgets/styles/qstyleanimation_p.h
@@ -83,7 +83,8 @@ public:
         DefaultFps,
         SixtyFps,
         ThirtyFps,
-        TwentyFps
+        TwentyFps,
+        FifteenFps
     };
 
     FrameRate frameRate() const;