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use crate::{
assets::{
asset::Asset,
protocol::{AssetLoadResult, AssetProtocol, AssetVariant, Meta},
},
prefab::{Prefab, PrefabScene},
};
use std::{any::Any, str::from_utf8};
pub struct PrefabAsset(PrefabScene);
impl PrefabAsset {
pub fn get(&self) -> &PrefabScene {
&self.0
}
}
pub struct PrefabAssetProtocol;
impl AssetProtocol for PrefabAssetProtocol {
fn name(&self) -> &str {
"prefab"
}
fn on_load(&mut self, data: Vec<u8>) -> AssetLoadResult {
match PrefabScene::from_prefab_str(from_utf8(&data).unwrap()) {
Ok(data) => {
if data.dependencies.is_empty() {
AssetLoadResult::Data(Box::new(PrefabAsset(data)))
} else {
let list = data
.dependencies
.iter()
.enumerate()
.map(|(i, path)| (i.to_string(), path.to_owned()))
.collect::<Vec<_>>();
AssetLoadResult::Yield(Some(Box::new(data)), list)
}
}
Err(error) => {
AssetLoadResult::Error(format!("Error loading prefab asset: {:?}", error))
}
}
}
fn on_resume(&mut self, payload: Meta, _: &[(&str, &Asset)]) -> AssetLoadResult {
let prefab = *(payload.unwrap() as Box<dyn Any + Send>)
.downcast::<PrefabScene>()
.unwrap();
AssetLoadResult::Data(Box::new(PrefabAsset(prefab)))
}
fn on_unload(&mut self, asset: &Asset) -> Option<Vec<AssetVariant>> {
asset.get::<PrefabAsset>().map(|asset| {
asset
.get()
.dependencies
.iter()
.map(|path| AssetVariant::Path(path.to_owned()))
.collect()
})
}
}