On Thu, 27 Aug 2026 22:03:53 GMT, Michael Strauß <[email protected]> wrote:
> For the longest time, I've had the impression that scrolling in JavaFX is not > quite right. Looking at it, that suspicion is quickly confirmed: the scroll > distance is incorrectly divided by the render scale. > > To reproduce, open MonkeyTester and scroll a ListView. On Windows 11 with a > system setting of 3 lines per detent, the ListView scrolls exactly 3 lines at > 100% render scale, 2 lines at 150% render scale, and 1.5 lines at 200% render > scale. > > The render scale conversion was introduced in 2015 when High-DPI support was > added. However, mouse wheel rotation is a dimensionless number, it shouldn't > be scaled at all. A line is a line, no matter the render scale. > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). We need to understand the impact on all three supported platforms. The change is in the common path, yet, like @crschnick , I see no difference on macOS, so the difference must come from elsewhere (toolkit?). Should it be addressed there instead? Also, the ScrollEvent contains other fields - are they impacted? ------------- PR Review: https://git.openjdk.org/jfx/pull/2282#pullrequestreview-5093368320
