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use std::collections::HashMap;
use std::fmt;
use crate::{generate_next_id, ComponentId, EventEntry, Scheduler, State};
pub trait ProcessEventEntry {
fn process_event_entry(&self, entry: EventEntry, scheduler: &mut Scheduler, state: &mut State);
}
pub trait Component: ProcessEventEntry {
type Event: fmt::Debug + 'static;
fn process_event(
&self,
self_id: ComponentId<Self::Event>,
event: &Self::Event,
scheduler: &mut Scheduler,
state: &mut State,
);
}
impl<E, C> ProcessEventEntry for C
where
E: fmt::Debug + 'static,
C: Component<Event = E>,
{
fn process_event_entry(&self, entry: EventEntry, scheduler: &mut Scheduler, state: &mut State) {
let entry = entry
.downcast::<E>()
.expect("Failed to downcast event entry.");
self.process_event(entry.component_id, entry.event, scheduler, state);
}
}
pub struct Components {
components: HashMap<usize, Box<dyn ::std::any::Any>>,
}
impl Default for Components {
#[must_use]
fn default() -> Self {
Self {
components: HashMap::new(),
}
}
}
impl Components {
pub fn process_event_entry(
&self,
entry: EventEntry,
scheduler: &mut Scheduler,
state: &mut State,
) {
self.components
.get(&entry.component_idx())
.unwrap()
.downcast_ref::<Box<dyn ProcessEventEntry>>()
.expect("Failed to downcast component.")
.process_event_entry(entry, scheduler, state);
}
#[must_use]
pub fn add_component<E: fmt::Debug + 'static, C: Component<Event = E> + 'static>(
&mut self,
component: C,
) -> ComponentId<E> {
let id = generate_next_id();
let component: Box<dyn ProcessEventEntry> = Box::new(component);
self.components.insert(id, Box::new(component));
ComponentId::new(id)
}
}
#[cfg(test)]
mod test {
use super::*;
use std::cell::RefCell;
use std::rc::Rc;
struct TestComponent(Rc<RefCell<String>>);
impl Component for TestComponent {
type Event = String;
fn process_event(
&self,
_self_id: ComponentId<Self::Event>,
event: &Self::Event,
_scheduler: &mut Scheduler,
_state: &mut State,
) {
*self.0.borrow_mut() = event.clone();
}
}
struct RcTestComponent(String);
impl Component for Rc<RefCell<RcTestComponent>> {
type Event = String;
fn process_event(
&self,
_self_id: ComponentId<Self::Event>,
event: &Self::Event,
_scheduler: &mut Scheduler,
_state: &mut State,
) {
self.borrow_mut().0 = event.clone();
}
}
#[test]
fn test_add_and_get_component() {
let mut scheduler = Scheduler::default();
let mut state = State::default();
let mut components = Components::default();
assert_eq!(components.components.len(), 0);
let text = Rc::new(RefCell::new(String::from("")));
let comp: ComponentId<String> = components.add_component(TestComponent(Rc::clone(&text)));
assert_eq!(components.components.len(), 1);
components.process_event_entry(
EventEntry::new(
std::time::Duration::default(),
comp,
String::from("Modified"),
),
&mut scheduler,
&mut state,
);
assert_eq!(*text.borrow(), "Modified");
}
#[test]
fn test_rc_ref_cell() {
let mut scheduler = Scheduler::default();
let mut state = State::default();
let component = Rc::new(RefCell::new(RcTestComponent(String::from(""))));
let mut components = Components::default();
let comp: ComponentId<String> = components.add_component(Rc::clone(&component));
components.process_event_entry(
EventEntry::new(
std::time::Duration::default(),
comp,
String::from("Modified"),
),
&mut scheduler,
&mut state,
);
assert_eq!(component.borrow().0, "Modified");
}
}