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use std::sync::{Arc, RwLock};
use mlua::{UserData, Value};
use super::{Sheet, SheetLuaRef};
static REGISTER: RwLock<Vec<Arc<RwLock<Sheet>>>> = RwLock::new(Vec::new());
pub type SheetId = usize;
#[derive(Debug)]
pub struct Register;
impl Register {
pub fn create(width: usize, height: usize) -> SheetId {
let mut register = REGISTER.write().unwrap();
let id = register.len();
let sheet = Sheet::new(width, height, id);
register.push(Arc::new(RwLock::new(sheet)));
id
}
pub fn get<'a>(id: SheetId) -> Option<Arc<RwLock<Sheet>>> {
let register = REGISTER.read().unwrap();
if id < register.len() {
Some(Arc::clone(®ister[id]))
} else {
None
}
}
}
impl UserData for Register {
fn add_methods<'lua, M: mlua::UserDataMethods<'lua, Self>>(methods: &mut M) {
methods.add_function_mut("create", |lua, (width, height): (usize, usize)| {
let id = Register::create(width, height);
let luaref = SheetLuaRef::new(id);
if let Ok(ud) = lua.create_userdata(luaref) {
Ok(Value::UserData(ud))
} else {
Ok(Value::Nil)
}
});
methods.add_function_mut("get", |lua, id: SheetId| {
if let Some(_) = Register::get(id) {
let luaref = SheetLuaRef::new(id);
if let Ok(ud) = lua.create_userdata(luaref) {
Ok(Value::UserData(ud))
} else {
Ok(Value::Nil)
}
} else {
Ok(Value::Nil)
}
})
}
}
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