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Fix horizontal scroll direction for macOS (#9022)

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macOS uses negative values to represent scrolls to the right, while
Flutter expects the opposite, so flip X deltas.
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stuartmorgan 2019-05-20 17:01:29 -04:00 committed by GitHub
parent dbf083bda1
commit e1599ccd3f
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shell/platform/darwin/macos/framework/Source/FLEViewController.mm
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@ -486,7 +486,7 @@ static void CommonInit(FLEViewController* controller) {
}
}
double scaleFactor = self.view.layer.contentsScale;
flutterEvent.scroll_delta_x = event.scrollingDeltaX * pixelsPerLine * scaleFactor;
flutterEvent.scroll_delta_x = -event.scrollingDeltaX * pixelsPerLine * scaleFactor;
flutterEvent.scroll_delta_y = -event.scrollingDeltaY * pixelsPerLine * scaleFactor;
}
FlutterEngineSendPointerEvent(_engine, &flutterEvent, 1);