How can i know which value to put in a setter for a duration type field?

[D4yvid]

I created a global which there's a field called animation-duration, that is of the type duration:

export global Animator {

    in-out property <duration> animation-duration: 120ms;
    in-out property <duration> ripple-animation-duration: 2s;

}

This property has a setter, that receives a i64 in the parameter, how can i know what to put in here? Should i use milliseconds, seconds, use what? Why not using a std::time::Duration as the argument instead of i64?

Here's the code:

    // Animator::set_animation_duration(value: i64)
    animator.set_animation_duration(120); // 120 milliseconds? 120 seconds? 120 what?

[ogoffart]

Yes, this is milliseconds. Documented there: https://releases.slint.dev/1.8.0/docs/rust/slint/docs/type_mappings/

Why not using a std::time::Duration as the argument instead of i64?

That is a very good question. The reason is that we can't use std::time::Duration as field of a generated struct or property because it is not repr(C) and because we also support other language like C++, it needs to be binary compatible.

We could have made so that we use std::time::Duration for things that are only exposed to rust, and u64 for things that needs to be shared, but unfortunately we didn't do that before Slint 1.0. (Would have made things more complicated)

[D4yvid]

Thanks for the reply! Now i understand why cannot use std::time::Duration instead!