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use std::cell::RefCell;
use std::fmt::Debug;
use std::rc::Rc;
pub struct Dispatcher<E: Debug> {
map: Vec<Box<dyn Fn(&E) -> bool>>,
}
#[allow(dead_code)]
impl<E> Dispatcher<E>
where
E: Debug,
{
pub fn new() -> Dispatcher<E> {
trace!("New dispatcher is created.");
Dispatcher::<E> { map: vec![] }
}
pub fn add_listener<F: 'static + Fn(&E) -> bool>(&mut self, f: F) {
trace!("Add listener to this dispatcher.");
self.map.push(Box::new(f));
}
pub fn dispatch(&mut self, ev: &E) -> bool {
let mut processed = false;
trace!(
"Dispatcher with {} handlers shall dispatch event {:?}",
self.map.len(),
ev
);
for f in &self.map {
if f(ev) {
processed = true;
break;
}
}
if processed {
self.map.clear();
}
trace!("Event dispatching result for {:?} is {}", ev, processed);
processed
}
pub fn clear(&mut self) {
trace!("Dispatcher clear called.");
self.map.clear();
}
}
pub trait EventListener<E: Debug> {
fn dispatcher(self, dispatcher: Rc<RefCell<Dispatcher<E>>>) -> Self;
}
#[cfg(test)]
mod tests {
use crate::Dispatcher;
use std::cell::RefCell;
use std::rc::Rc;
#[cfg(feature = "tui-crossterm")]
use crossterm::event::{Event, KeyCode, KeyEvent, KeyModifiers};
#[cfg(feature = "tui-termion")]
use termion::event::{Event, Key};
fn make_queue(dispatcher: &mut Dispatcher<Event>, v: Rc<RefCell<u64>>) {
macro_rules! match_key {
($ev:expr, $name:ident) => {{
let ev = $ev;
#[cfg(feature = "tui-crossterm")]
let m = matches!(
ev,
&Event::Key(KeyEvent {
code: KeyCode::$name,
modifiers: _,
})
);
#[cfg(feature = "tui-termion")]
let m = ev == &Event::Key(Key::$name);
m
}};
}
let vx = v.clone();
dispatcher.add_listener(move |ev| {
if match_key!(ev, Left) {
*vx.borrow_mut() += 1;
true
} else {
false
}
});
let vx = v.clone();
dispatcher.add_listener(move |ev| {
if match_key!(ev, Left) {
*vx.borrow_mut() += 2;
true
} else {
false
}
});
let vx = v.clone();
dispatcher.add_listener(move |ev| {
if match_key!(ev, Down) {
*vx.borrow_mut() += 4;
true
} else {
false
}
});
}
#[test]
fn test_dispatch() {
macro_rules! gen_key {
($name:ident) => {{
#[cfg(feature = "tui-crossterm")]
let ev = Event::Key(KeyEvent {
code: KeyCode::$name,
modifiers: KeyModifiers::NONE,
});
#[cfg(feature = "tui-termion")]
let ev = Event::Key(Key::$name);
ev
}};
}
let v = Rc::new(RefCell::new(0));
let mut dispatcher = crate::Dispatcher::<Event>::new();
make_queue(&mut dispatcher, v.clone());
assert_eq!(*v.borrow(), 0);
let processed = dispatcher.dispatch(&gen_key!(Left));
assert_eq!(processed, true);
assert_eq!(*v.borrow(), 1);
make_queue(&mut dispatcher, v.clone());
assert_eq!(*v.borrow(), 1);
let processed = dispatcher.dispatch(&gen_key!(Down));
assert_eq!(processed, true);
assert_eq!(*v.borrow(), 5);
make_queue(&mut dispatcher, v.clone());
assert_eq!(*v.borrow(), 5);
let processed = dispatcher.dispatch(&gen_key!(Up));
assert_eq!(processed, false);
assert_eq!(*v.borrow(), 5);
let processed = dispatcher.dispatch(&gen_key!(Down));
assert_eq!(processed, true);
assert_eq!(*v.borrow(), 9);
}
}