| 17 Sep 2023 |
 kirillsemyonkin | you dont like sending callbacks down the tree, which i think you mean sending a prop parent -> child -> child -> child - this is called prop drilling, and you may solve it just using built-in ContextProvider
pseudo example code that may not have all derives needed:
#[derive(Clone, PartialEq)]
pub struct YourContext {
callback: Callback<SomeThing, SomeThing>;
}
impl YourContext {
pub fn callback(&self, thing: SomeThing) -> SomeThing {
self.callback.emit(thing)
}
}
#[function_component]
pub fn Parent(...children...) -> Html {
let callback = ...;
let context = YourContext { callback };
html! {
<ContextProvider<YourContext> { context }>
{ children.clone() }
</ContextProvider>
}
}
#[function_component]
pub fn Child() -> Html {
let context = use_context::<YourContext>().unwrap();
...context.callback(...)...
}
#[function_component]
pub fn Main() -> Html {
html! {
<Parent>
<Child />
</Parent>
}
}
| 10:59:31 |
| kirillsemyonkin | * you dont like sending callbacks down the tree, which i think you mean sending a prop parent -> child -> child -> child - this is called prop drilling, and you may solve it just using built-in ContextProvider
pseudo example code that may not have all derives needed:
#[derive(Clone, PartialEq)]
pub struct YourContext {
callback: Callback<SomeThing, SomeThing>;
}
impl YourContext {
pub fn callback(&self, thing: SomeThing) -> SomeThing {
self.callback.emit(thing)
}
}
#[function_component]
pub fn Parent(...children...) -> Html {
let callback = ...;
let context = YourContext { callback };
html! {
<ContextProvider<YourContext> { context }>
{ children.clone() }
</ContextProvider<YourContext>>
}
}
#[function_component]
pub fn Child() -> Html {
let context = use_context::<YourContext>().unwrap();
...context.callback(...)...
}
#[function_component]
pub fn Main() -> Html {
html! {
<Parent>
<Child />
</Parent>
}
}
| 10:59:45 |
| kirillsemyonkin | https://yew.rs/docs/next/concepts/contexts | 11:00:06 |
| kirillsemyonkin | two things here:
- callback is not prop-drilled, because we use contexts
- child does not know that theres an actual Callback, we hid it from them by using impl YourContext | 11:05:14 |
| kirillsemyonkin | also, UseStateSender and UseReducerDispatch are pretty much Callbacks and you may use them as a shortcut | 11:09:34 |
| kirillsemyonkin | * also, UseStateSetter and UseReducerDispatch are pretty much Callbacks and you may use them as a shortcut | 11:09:38 |
 kraem_ | thanks. i'll have to read up on contexts. | 11:56:16 |
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