examples/game_of_life/src/time.rs


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use iced::futures;

pub fn every(
    duration: std::time::Duration,
) -> iced::Subscription<std::time::Instant> {
    iced::Subscription::from_recipe(Every(duration))
}

struct Every(std::time::Duration);

impl<H, I> iced_native::subscription::Recipe<H, I> for Every
where
    H: std::hash::Hasher,
{
    type Output = std::time::Instant;

    fn hash(&self, state: &mut H) {
        use std::hash::Hash;

        std::any::TypeId::of::<Self>().hash(state);
        self.0.hash(state);
    }

    fn stream(
        self: Box<Self>,
        _input: futures::stream::BoxStream<'static, I>,
    ) -> futures::stream::BoxStream<'static, Self::Output> {
        use futures::stream::StreamExt;

        async_std::stream::interval(self.0)
            .map(|_| std::time::Instant::now())
            .boxed()
    }
}