use std::ops::Deref;
use std::rc::Rc;
use gloo::storage::{LocalStorage, Storage};
use serde::{Deserialize, Serialize};
use web_sys::StorageEvent;
use yew::prelude::*;
use super::use_event_with_window;
/// State handle for the [`use_local_storage`] hook.
pub struct UseLocalStorageHandle<T> {
inner: UseStateHandle<Option<T>>,
key: Rc<String>,
}
impl<T> UseLocalStorageHandle<T> {
/// Set a `value` for the specified key.
pub fn set(&self, value: T)
where
T: Serialize + Clone,
{
if LocalStorage::set(&*self.key, value.clone()).is_ok() {
self.inner.set(Some(value));
}
}
/// Delete a key and it's stored value.
pub fn delete(&self) {
LocalStorage::delete(&*self.key);
self.inner.set(None);
}
}
impl<T> Deref for UseLocalStorageHandle<T> {
type Target = Option<T>;
fn deref(&self) -> &Self::Target {
&self.inner
}
}
impl<T> Clone for UseLocalStorageHandle<T> {
fn clone(&self) -> Self {
Self {
inner: self.inner.clone(),
key: self.key.clone(),
}
}
}
impl<T> PartialEq for UseLocalStorageHandle<T>
where
T: PartialEq,
{
fn eq(&self, other: &Self) -> bool {
*self.inner == *other.inner
}
}
/// A side-effect hook that manages a single localStorage key.
///
/// # Example
///
/// ```rust
/// # use yew::prelude::*;
/// #
/// use yew_hooks::prelude::*;
///
/// #[function_component(LocalStorage)]
/// fn local_storage() -> Html {
/// let storage = use_local_storage::<String>("foo".to_string());
///
/// let onclick = {
/// let storage = storage.clone();
/// Callback::from(move |_| storage.set("bar".to_string()))
/// };
/// let ondelete = {
/// let storage = storage.clone();
/// Callback::from(move |_| storage.delete())
/// };
///
/// html! {
/// <div>
/// <button onclick={onclick}>{ "Set to bar" }</button>
/// <button onclick={ondelete}>{ "Delete" }</button>
/// <p>
/// <b>{ "Current value: " }</b>
/// {
/// if let Some(value) = &*storage {
/// html! { value }
/// } else {
/// html! {}
/// }
/// }
/// </p>
/// </div>
/// }
/// }
/// ```
#[hook]
pub fn use_local_storage<T>(key: String) -> UseLocalStorageHandle<T>
where
T: for<'de> Deserialize<'de> + 'static,
{
let inner: UseStateHandle<Option<T>> =
use_state(|| LocalStorage::get(&key).unwrap_or_default());
let key = use_memo(|_| key, ());
{
let key = key.clone();
let inner = inner.clone();
use_event_with_window("storage", move |e: StorageEvent| {
if let Some(k) = e.key() {
if k == *key {
inner.set(LocalStorage::get(&*key).unwrap_or_default());
}
}
});
}
UseLocalStorageHandle { inner, key }
}