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wayland: handle axis_value120 scroll events

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This can be tested with the `application` example, looking at the events
shown for mouse wheel movement.

`wl_pointer::axis_discrete` isn't sent in version 8 or higher of
`wl_pointer`. And `sctk` doesn't convert the `value120` events, so
on compositors advertising version 8, only pixel scroll events were
being sent.

This sends `MouseScrollDelta::LineDelta` with a fractional value,
without doing any accumulation. Given `LineDelta` contains `f32` values,
this presumably is expected?

Though it might be good to change the definition of `MouseScrollDelta`
to include both discrete and pixel values, when the compositor sends
both. I'm not familiar with how this works on non-Wayland backends
though.
This commit is contained in:
Ian Douglas Scott 2025-10-07 19:53:57 -07:00 • committed by GitHub
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winit/src/changelog/unreleased.md
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@ -268,3 +268,4 @@ changelog entry.
- On Windows, `Window::set_theme` will change the title bar color immediately now.
- On Windows 11, prevent incorrect shifting when dragging window onto a monitor with different DPI.
- On Web, device events are emitted regardless of cursor type.
- On Wayland, `axis_value120` scroll events now generate `MouseScrollDelta::LineDelta`