diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm index a0a5a2e5cfe..82b4e54deb1 100644 --- a/src/plugins/platforms/cocoa/qnsview.mm +++ b/src/plugins/platforms/cocoa/qnsview.mm @@ -337,9 +337,20 @@ static QTouchDevice *touchDevice = 0; // It looks like 1/4 degrees per pixel behaves most native. // (NB: Qt expects the unit for delta to be 8 per degree): const int pixelsToDegrees = 2; // 8 * 1/4 - deltaX = [theEvent deviceDeltaX] * pixelsToDegrees; - deltaY = [theEvent deviceDeltaY] * pixelsToDegrees; - deltaZ = [theEvent deviceDeltaZ] * pixelsToDegrees; + +#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7 + if ([theEvent respondsToSelector:@selector(scrollingDeltaX)]) { + deltaX = [theEvent scrollingDeltaX] * pixelsToDegrees; + deltaY = [theEvent scrollingDeltaY] * pixelsToDegrees; + // scrollingDeltaZ API is missing. + } else +#endif + { + deltaX = [theEvent deviceDeltaX] * pixelsToDegrees; + deltaY = [theEvent deviceDeltaY] * pixelsToDegrees; + deltaZ = [theEvent deviceDeltaZ] * pixelsToDegrees; + } + } else { // carbonEventKind == kEventMouseWheelMoved // Remove acceleration, and use either -120 or 120 as delta: