6882420c7f
# Objective
- Some types are missing reflection attributes, which means we can't use
them in scene serialization etc.
- Effected types
- `BorderRadius`
- `AnimationTransitions`
- `OnAdd`
- `OnInsert`
- `OnRemove`
- My use-case for `OnAdd` etc to derive reflect is 'Serializable
Observer Components'. Add the component, save the scene, then the
observer is re-added on scene load.
```rust
#[derive(Reflect)]
struct MySerializeableObserver<T: Event>(#[reflect(ignore)]PhantomData<T>);
impl<T: Event> Component for MySerializeableObserver<T> {
const STORAGE_TYPE: StorageType = StorageType::Table;
fn register_component_hooks(hooks: &mut ComponentHooks) {
hooks.on_add(|mut world, entity, _| {
world
.commands()
.entity(entity)
.observe(|_trigger: Trigger<T>| {
println!("it triggered etc.");
});
});
}
}
```
## Solution
- Add the missing traits
---
29 lines
979 B
Rust
29 lines
979 B
Rust
use super::*;
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use crate::{self as bevy_ecs};
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#[cfg(feature = "bevy_reflect")]
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use bevy_reflect::Reflect;
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/// Internal components used by bevy with a fixed component id.
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/// Constants are used to skip [`TypeId`] lookups in hot paths.
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/// [`ComponentId`] for [`OnAdd`]
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pub const ON_ADD: ComponentId = ComponentId::new(0);
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/// [`ComponentId`] for [`OnInsert`]
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pub const ON_INSERT: ComponentId = ComponentId::new(1);
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/// [`ComponentId`] for [`OnRemove`]
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pub const ON_REMOVE: ComponentId = ComponentId::new(2);
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/// Trigger emitted when a component is added to an entity.
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#[derive(Event)]
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#[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
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pub struct OnAdd;
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/// Trigger emitted when a component is inserted on to to an entity.
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#[derive(Event)]
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#[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
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pub struct OnInsert;
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/// Trigger emitted when a component is removed from an entity.
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#[derive(Event)]
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#[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
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pub struct OnRemove;
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