Function freya::prelude::use_tracked_state

pub fn use_tracked_state<T>(
    cx: &ScopeState,
    init: impl FnOnce() -> T
) -> &Tracked<T>where
    T: 'static,

Create a new tracked state. Tracked state is state that can drive Selector state

It state will efficiently update any Selector state that is reading from it, but it is not readable on it’s own.

use dioxus::prelude::*;

fn Parent(cx: Scope) -> Element {
   let count = use_tracked_state(cx, || 0);

   render! {
       Child {
           count: count.clone(),
       }
   }
}

#[inline_props]
fn Child(cx: Scope, count: Tracked<usize>) -> Element {
   let less_than_five = use_selector(cx, count, |count| *count < 5);

   render! {
       "{less_than_five}"
   }
}