55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
use iced_futures::futures::channel::mpsc;
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use std::rc::Rc;
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/// A publisher of messages.
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///
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/// It can be used to route messages back to the [`Application`].
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///
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/// [`Application`]: trait.Application.html
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#[allow(missing_debug_implementations)]
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pub struct Bus<Message> {
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publish: Rc<Box<dyn Fn(Message) -> ()>>,
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}
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impl<Message> Clone for Bus<Message> {
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fn clone(&self) -> Self {
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Bus {
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publish: self.publish.clone(),
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}
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}
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}
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impl<Message> Bus<Message>
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where
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Message: 'static,
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{
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pub(crate) fn new(publish: mpsc::UnboundedSender<Message>) -> Self {
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Self {
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publish: Rc::new(Box::new(move |message| {
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publish.unbounded_send(message).expect("Send message");
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})),
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}
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}
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/// Publishes a new message for the [`Application`].
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///
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/// [`Application`]: trait.Application.html
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pub fn publish(&self, message: Message) {
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(self.publish)(message)
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}
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/// Creates a new [`Bus`] that applies the given function to the messages
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/// before publishing.
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///
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/// [`Bus`]: struct.Bus.html
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pub fn map<B>(&self, mapper: Rc<Box<dyn Fn(B) -> Message>>) -> Bus<B>
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where
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B: 'static,
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{
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let publish = self.publish.clone();
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Bus {
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publish: Rc::new(Box::new(move |message| publish(mapper(message)))),
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}
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}
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}
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