wasm support?

[zhangzqs]

Is it possible to port it to run on the wasm platform?
wasm in browser don't support Instant::now().
If this interface is defined, it will be able to run on the wasm platform
#2 (comment)

[maxwase]

That's an interesting question, I didn't consider WASM as a platform for this crate, however it seems that it is possible, so why not 😄

As you have already spotted, there is an issue for an external timer trait, honestly, I don't have good ideas on how to define one straight away, however I didn't think about it much. This issue is kind of the same to the one in embedded_hal crate, they also struggle to define one generic enough trait...

Could you please share an example on how you would like to use this crate on WASM platform and how you would implement Instant on it if it misses one? That would help to consider needed aspects for the trait.

[zhangzqs]

That's an interesting question, I didn't consider WASM as a platform for this crate, however it seems that it is possible, so why not 😄

As you have already spotted, there is an issue for an external timer trait, honestly, I don't have good ideas on how to define one straight away, however I didn't think about it much.

Could you please share an example on how you would like to use this crate on WASM platform and how you would implement Instant on it if it misses one? That would help to consider needed aspects for the trait.

Actually, we don't rely on absolute time, we only need to rely on the relative time since the Button was new, so we can actually just use core::time::Duration instead of Instant.

[zhangzqs]

I tried to file a draft PR to change this, but noticed that the State enum and raw_state function are public, which means some incompatible changes have occurred to the public API.

https://github.com/maxwase/button-driver/pull/9/files

[maxwase]

It would be great if you could try to implement your use case using #10