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