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|
use iced::{
Align, Application, Checkbox, Column, Command, Container, Element, Length,
Settings, Subscription, Text,
};
pub fn main() {
Clock::run(Settings::default())
}
#[derive(Debug)]
struct Clock {
time: chrono::DateTime<chrono::Local>,
enabled: bool,
}
#[derive(Debug, Clone)]
enum Message {
Ticked(chrono::DateTime<chrono::Local>),
Toggled(bool),
}
impl Application for Clock {
type Message = Message;
fn new() -> (Clock, Command<Message>) {
(
Clock {
time: chrono::Local::now(),
enabled: false,
},
Command::none(),
)
}
fn title(&self) -> String {
String::from("Clock - Iced")
}
fn update(&mut self, message: Message) -> Command<Message> {
match message {
Message::Ticked(time) => {
self.time = time;
}
Message::Toggled(enabled) => {
self.enabled = enabled;
}
};
Command::none()
}
fn subscriptions(&self) -> Subscription<Message> {
if self.enabled {
time::every(std::time::Duration::from_millis(500), Message::Ticked)
} else {
Subscription::none()
}
}
fn view(&mut self) -> Element<Message> {
let clock = Text::new(format!("{}", self.time.format("%H:%M:%S")))
.size(40)
.width(Length::Shrink);
let toggle = Checkbox::new(self.enabled, "Enabled", Message::Toggled)
.width(Length::Shrink);
let content = Column::new()
.width(Length::Shrink)
.align_items(Align::Center)
.spacing(20)
.push(clock)
.push(toggle);
Container::new(content)
.width(Length::Fill)
.height(Length::Fill)
.center_x()
.center_y()
.into()
}
}
mod time {
use std::sync::{Arc, Mutex};
pub fn every<Message>(
duration: std::time::Duration,
f: impl Fn(chrono::DateTime<chrono::Local>) -> Message
+ 'static
+ Send
+ Sync,
) -> iced::Subscription<Message>
where
Message: Send + 'static,
{
Tick {
duration,
message: Arc::new(f),
}
.into()
}
struct Tick<Message> {
duration: std::time::Duration,
message: Arc<
dyn Fn(chrono::DateTime<chrono::Local>) -> Message + Send + Sync,
>,
}
struct TickState {
alive: Arc<Mutex<bool>>,
}
impl iced::subscription::Handle for TickState {
fn cancel(&mut self) {
match self.alive.lock() {
Ok(mut guard) => *guard = false,
_ => {}
}
}
}
impl<Message> iced::subscription::Definition for Tick<Message>
where
Message: 'static,
{
type Message = Message;
fn id(&self) -> u64 {
0
}
fn stream(
&self,
) -> (
futures::stream::BoxStream<'static, Message>,
Box<dyn iced::subscription::Handle>,
) {
use futures::StreamExt;
let duration = self.duration.clone();
let function = self.message.clone();
let alive = Arc::new(Mutex::new(true));
let state = TickState {
alive: alive.clone(),
};
let stream = futures::stream::poll_fn(move |_| {
std::thread::sleep(duration);
if !*alive.lock().unwrap() {
return std::task::Poll::Ready(None);
}
let now = chrono::Local::now();
std::task::Poll::Ready(Some(now))
})
.map(move |time| function(time));
(stream.boxed(), Box::new(state))
}
}
}
|
