yew-hooks 0.2.0

use yew::prelude::*;

use super::use_is_first_mount;

/// This hook ignores the first invocation (e.g. on mount).
/// The signature is exactly the same as the [`use_effect`] hook.
///
/// # Example
///
/// ```rust
/// # use yew::prelude::*;
/// # use log::debug;
/// #
/// use yew_hooks::prelude::*;
///
/// #[function_component(UseEffectUpdate)]
/// fn effect_update() -> Html {
///     use_effect_update(|| {
///         debug!("Running effect only on updates");
///
///         || ()
///     });
///     
///     html! {
///         <>
///         </>
///     }
/// }
/// ```
#[hook]
pub fn use_effect_update<Callback, Destructor>(callback: Callback)
where
    Callback: FnOnce() -> Destructor + 'static,
    Destructor: FnOnce() + 'static,
{
    let first = use_is_first_mount();

    use_effect(move || {
        if first {
            Box::new(|| ()) as Box<dyn FnOnce()>
        } else {
            Box::new(callback())
        }
    });
}

/// This hook is similar to [`use_effect_update`] but it accepts dependencies.
/// The signature is exactly the same as the [`use_effect_with_deps`] hook.
#[hook]
pub fn use_effect_update_with_deps<Callback, Destructor, Dependents>(
    callback: Callback,
    deps: Dependents,
) where
    Callback: FnOnce(&Dependents) -> Destructor + 'static,
    Destructor: FnOnce() + 'static,
    Dependents: PartialEq + 'static,
{
    let first = use_is_first_mount();

    use_effect_with_deps(
        move |deps| {
            if first {
                Box::new(|| ()) as Box<dyn FnOnce()>
            } else {
                Box::new(callback(deps))
            }
        },
        deps,
    );
}