Component hook ergonomics #21794
Description
What problem does this solve or what need does it fill?
It would be nice if this common pattern could be expressed more easily:
#[derive(Component]
#[component(on_add = Self::on_add, on_remove = Self::on_remove)]
struct TilePosition {
x: u32,
y: u32,
}
impl TilePosition {
fn on_add(mut world: DeferredWorld, context: HookContext) {
}
fn on_remove(mut world: DeferredWorld, context: HookContext) {
}
}What solution would you like?
The component hook derive attributes currently have no default value. I propose that we default #[component(on_add)] to #[component(on_add = Self::on_add)]. For example:
#[derive(Component]
#[component(on_add)]
struct TilePosition {
x: u32,
y: u32,
}
impl TilePosition {
fn on_add(mut world: DeferredWorld, context: HookContext) {
}
}