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extern crate gtk_test;
extern crate relm_core;
use std::cell::RefCell;
use std::rc::Rc;
use relm_core::EventStream;
pub struct Observer<MSG> {
result: Rc<RefCell<Option<MSG>>>,
}
impl<MSG: Clone + 'static> Observer<MSG> {
pub fn new<F: Fn(&MSG) -> bool + 'static>(stream: &EventStream<MSG>, predicate: F) -> Self {
let result = Rc::new(RefCell::new(None));
let res = result.clone();
stream.observe(move |msg| {
if predicate(msg) {
*res.borrow_mut() = Some(msg.clone());
}
});
Self {
result,
}
}
pub fn wait(&self) -> MSG {
loop {
if let Ok(ref result) = self.result.try_borrow() {
if result.is_some() {
break;
}
}
gtk_test::run_loop();
}
self.result.borrow_mut().take()
.expect("Message to take")
}
}
#[macro_export]
macro_rules! relm_observer_new {
($component:expr, $pat:pat) => {
$crate::Observer::new($component.stream(), |msg|
if let $pat = msg {
true
}
else {
false
}
);
};
}
#[macro_export]
macro_rules! relm_observer_wait {
(let $($variant:ident)::*($name1:ident, $name2:ident $(,$rest:ident)*) = $observer:expr) => {
let ($name1, $name2 $(, $rest)*) = {
let msg = $observer.wait();
if let $($variant)::*($name1, $name2 $(, $rest)*) = msg {
($name1, $name2 $(, $rest)*)
}
else {
panic!("Wrong message type.");
}
};
};
(let $($variant:ident)::*($name:ident) = $observer:expr) => {
let $name = {
let msg = $observer.wait();
if let $($variant)::*($name) = msg {
$name
}
else {
panic!("Wrong message type.");
}
};
};
(let $($variant:ident)::* = $observer:expr) => {
let () = {
let msg = $observer.wait();
if let $($variant)::* = msg {
()
}
else {
panic!("Wrong message type.");
}
};
};
}