Allow "acceleration" option for scrolling

[tylerwince]

To enable smoother scrolling, I think it would be beneficial to have an acceleration parameter in the settings. This would essentially enable scrolling to start slow and ramp up to full speed when using j or k. Not only does having a small amount of acceleration feel more natural, it also enables smaller scroll motions when tapping j or k quickly as the application doesn't immediately jump to a full-speed scroll.

This should definitely be an optional parameter, as I know many people dislike scroll acceleration, but it could help Scrolla feel a bit less "abrupt" when trying to scroll smaller motions.

Edit: I would suggest this should be a numeric parameter in ms. Essentially: "Acceleration Time: 0ms" would be the current behavior. Anything >0ms would be the time it takes to accelerate from motionless to full-speed.

[godbout]

ah. sorry for the late answer. got lost in some place without electricity nor phone data 😅️

anyways, i need to explore more the macOS APIs but as far as my investigation goes there doesn't seem to be any (nice/easy?) ways to handle that. i'm planning to add another mode, without holding keys (see #6). probably by the time i'll have gathered more info and will have a better idea of what's possible and what's not. thanks for taking the time to raise the idea.

[godbout]

current research regarding this:

• https://stackoverflow.com/questions/44196338/where-is-mouse-cursor-movement-acceleration-and-scroll-wheel-acceleration-implem
• https://gist.github.com/svoisen/5215826

[haveanicedavid]

FWIW, acceleration would probably solve the same use case as my FR #17 (which is, basically, wanting to scroll quickly through a page to find something I noticed but lost place of)

[godbout]

acceleration is another beast. not even sure it's possible without dealing with super low level shits.