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dioxus/packages/core/examples/borrowed.rs
2021-08-08 15:15:16 -04:00

77 lines
2.1 KiB
Rust

//! Demonstrate that borrowed data is possible as a property type
//! Borrowing (rather than cloning) is very important for speed and ergonomics.
//!
//! It's slightly more advanced than just cloning, but well worth the investment.
//!
//! If you use the FC macro, we handle the lifetimes automatically, making it easy to write efficient & performant components.
fn main() {}
use dioxus_core::prelude::*;
use std::rc::Rc;
struct AppProps {
items: Vec<Rc<ListItem>>,
}
#[derive(PartialEq)]
struct ListItem {
name: String,
age: u32,
}
fn app(cx: Context<AppProps>) -> DomTree {
// let (val, set_val) = use_state_classic(cx, || 0);
cx.render(LazyNodes::new(move |_nodecx| {
todo!()
// builder::ElementBuilder::new(_nodecx, "div")
// .iter_child({
// cx.items.iter().map(|child| {
// builder::virtual_child(
// _nodecx,
// ChildItem,
// ChildProps {
// item: child.clone(),
// item_handler: set_val.clone(),
// },
// None,
// &[],
// )
// })
// })
// .iter_child([builder::ElementBuilder::new(_nodecx, "div")
// .iter_child([builder::text3(_nodecx.bump(), format_args!("{}", val))])
// .finish()])
// .finish()
}))
}
// props should derive a partialeq implementation automatically, but implement ptr compare for & fields
struct ChildProps {
// Pass down complex structs
item: Rc<ListItem>,
// Even pass down handlers!
item_handler: Rc<dyn Fn(i32)>,
}
fn ChildItem<'a>(cx: Context<'a, ChildProps>) -> DomTree {
cx.render(LazyNodes::new(move |__cx| todo!()))
}
impl PartialEq for ChildProps {
fn eq(&self, _other: &Self) -> bool {
false
}
}
impl Properties for ChildProps {
type Builder = ();
const IS_STATIC: bool = true;
fn builder() -> Self::Builder {
()
}
unsafe fn memoize(&self, other: &Self) -> bool {
self == other
}
}