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use std::collections::HashMap;
use crate::event::Event;
#[cfg(test)]
mod tests;
pub struct EventHandler {
event_handlers: HashMap<String, Vec<Box<dyn Fn(Event) -> Option<Event> + Send + Sync>>>,
}
impl EventHandler {
pub fn new() -> Self {
Self {
event_handlers: HashMap::new(),
}
}
pub fn on<F: 'static>(&mut self, event_name: &str, handler: F)
where
F: Fn(Event) -> Option<Event> + Send + Sync,
{
match self.event_handlers.get_mut(event_name) {
Some(handlers) => handlers.push(Box::new(handler)),
None => {
self.event_handlers
.insert(event_name.to_string(), vec![Box::new(handler)]);
}
}
}
pub fn handle_event(&mut self, event: Event) -> Option<Event> {
if let Some(handlers) = self.event_handlers.get(&event.name) {
let mut event = Some(event);
for handler in handlers {
if let Some(e) = handler(event.unwrap()) {
event = Some(e);
} else {
event = None;
break;
}
}
event
} else {
None
}
}
}