Why is decelerationRate set to 0.88 for the FlatList used by DurationScroll?

[Off2Race]

Hello! While testing the TimerPicker component in my app, the scrolling behavior seems "sluggish" to me on iOS. In other words, if I spin the duration controls, it stops more quickly than I would expect.

I looked in the code and noticed that the decelerationRate prop is set to 0.88 for the internal FlatList component used by the DurationScroll component, which seems to be the cause.

QUESTIONS
1 – Why is this decelerationRate prop hardcoded to this value? I'm assuming it must be done for a reason :)
2 – Have you considered adding a decelerationRate prop to TimerPicker that would pass down so that users of the component can control it?

I'll likely create a patch so I can workaround this problem for myself but I figured I'd log this issue to raise the question.

[troberts-28]

Hey @Off2Race, thanks for raising this.

The 0.88 deceleration rate was added to make the picker land on a value relatively quickly after a hefty scroll. It was a UX-preference rather than anything technical, so completely agree that it should be possible to change it with a prop.

I can get this added when I next do some work on the library, or feel free to create a PR to get it merged sooner!

[Off2Race]

Hi, @troberts-28 – Thanks for the quick response. I'll give it a shot and send you the PR!

[Off2Race]

Hi, @troberts-28 – I noticed a couple of unrelated issues while working on this:

1 – There's a bug in the start-bare:ios script. It looks like someone might have inadvertently copied start-bare:android and didn't change the platform parameter. I thought about just fixing it but figured you might want to keep the PRs single-purpose.

2 – I followed the Contributing instructions but the yarn setup command would not work for me. Not sure why. Could be that I have an older version of yarn installed globally. In any case, I was able to do yarn install so it wasn't a blocking issue. But I thought I'd mention it in case you wanted to make a note in the instructions.

[troberts-28]

Thank you for pointing these out! Will address them in the next release ✅

[Off2Race]

Welcome! Here's the PR – #57