use mutex instead of msg passing between input and render threads

src/engine.rs

@@ -25,111 +25,109 @@ pub enum Event {
 }
 
 pub struct Engine {
-    stdout:       Stdout,
     exited:       Arc<AtomicBool>,
     sender:       Sender<Event>,
     receiver:     Receiver<Event>,
-    input_thread: JoinHandle<()>,
     pub jack_client: Jack<Notifications>,
 }
 
+pub fn jack_client <N: NotificationHandler + Sync + 'static> (
+    name: &str,
+    notifications: N,
+    handler: BoxedProcessHandler
+) -> Result<Jack<N>, Box<dyn Error>> {
+    let (client, _status) = Client::new(name, ClientOptions::NO_START_SERVER)?;
+    Ok(client.activate_async(notifications, ClosureProcessHandler::new(handler))?)
+}
+
 impl Engine {
 
     pub fn new (name: Option<&str>) -> Result<Self, Box<dyn Error>> {
         let (sender, receiver) = mpsc::channel::<self::Event>();
         let exited = Arc::new(AtomicBool::new(false));
-
-        let jack_client = {
-            let sender = sender.clone();
-            let exited = exited.clone();
-            let (client, _status) = Client::new(
+        Ok(Self {
+            jack_client: jack_client(
                 name.unwrap_or("blinkenlive"),
-                ClientOptions::NO_START_SERVER
-            )?;
-            let handler = ClosureProcessHandler::new(
-                Box::new(move |_client: &Client, _ps: &ProcessScope| -> Control {
-                    if exited.fetch_and(true, Ordering::Relaxed) {
-                        Control::Quit
-                    } else {
-                        sender.send(Event::Update).unwrap();
-                        Control::Continue
-                    }
-                }) as BoxedProcessHandler
-            );
+                Notifications(sender.clone()),
+                Box::new({
+                    let sender = sender.clone();
+                    let exited = exited.clone();
+                    move |_client: &Client, _ps: &ProcessScope| -> Control {
+                        if exited.fetch_and(true, Ordering::Relaxed) {
+                            Control::Quit
+                        } else {
+                            sender.send(Event::Update).unwrap();
+                            Control::Continue
+                        }
+                    }}))?,
+            exited,
+            sender,
+            receiver,
+        })
+    }
 
-            client.activate_async(Notifications, handler)?
-        };
+    pub fn run <T: Exitable + WidgetRef + HandleInput + Send + 'static> (
+        &mut self, mut state: T,
+    ) -> Result<(), Box<dyn Error>> {
+
+        let state = Arc::new(Mutex::new(state));
 
         let input_thread = {
-            let sender = sender.clone();
-            let exited = exited.clone();
+            let state  = state.clone();
+            let sender = self.sender.clone();
+            let exited = self.exited.clone();
             let poll = std::time::Duration::from_millis(100);
-            spawn(move || {
-                loop {
-                    // Exit if flag is set
-                    if exited.fetch_and(true, Ordering::Relaxed) {
+            spawn(move || loop {
+                // Exit if flag is set
+                if exited.fetch_and(true, Ordering::Relaxed) {
+                    break
+                }
+                // Listen for events and send them to the main thread
+                if event::poll(poll).is_ok() {
+                    let event = event::read().unwrap();
+                    let mut state = state.lock().unwrap();
+                    if state.handle(&Event::Input(event)).is_err() {
                         break
                     }
-                    // Listen for events and send them to the main thread
-                    if event::poll(poll).is_ok() {
-                        let event = event::read().unwrap();
-                        if sender.send(Event::Input(event)).is_err() {
-                            break
-                        }
-                    }
                 }
             })
         };
 
-        Ok(Self {
-            stdout: stdout(),
-            exited,
-            sender,
-            receiver,
-            jack_client,
-            input_thread,
-        })
-    }
+        let render_thread = {
+            stdout().queue(EnterAlternateScreen)?.flush()?;
+            enable_raw_mode()?;
+            let mut terminal = ratatui::Terminal::new(CrosstermBackend::new(stdout()))?;
+            let sleep = std::time::Duration::from_millis(16);
+            let exited = self.exited.clone();
+            spawn(move || loop {
+                terminal.draw(|frame|{
+                    let area = frame.size();
+                    frame.render_widget(
+                        &*state.lock().unwrap(),
+                        area
+                    );
+                });
+                if state.lock().unwrap().exited() {
+                    exited.store(true, Ordering::Relaxed);
+                    break
+                }
+                std::thread::sleep(sleep);
+            })
+        };
+
+        render_thread.join();
+
+        stdout()
+            .queue(crossterm::terminal::LeaveAlternateScreen)?
+            .flush()?;
+        crossterm::terminal::disable_raw_mode()?;
 
-    pub fn run <T: Exitable + WidgetRef + HandleInput> (
-        &mut self, mut state: T,
-    ) -> Result<(), Box<dyn Error>> {
-        stdout().queue(EnterAlternateScreen)?.flush();
-        enable_raw_mode()?;
-        let mut terminal = ratatui::Terminal::new(CrosstermBackend::new(stdout()))?;
-        let sleep = std::time::Duration::from_millis(20);
-        loop {
-            //stdout()
-                //.queue(crossterm::terminal::BeginSynchronizedUpdate)?
-                //.queue(Clear(ClearType::All))?;
-            terminal.draw(|frame|{
-                let area = frame.size();
-                frame.render_widget(&state, area);
-            });
-            //render(state, stdout, (0, 0))?;
-            //stdout()
-                //.queue(crossterm::terminal::EndSynchronizedUpdate)?
-                //.flush()?;
-            // Handle event if present (`None` redraws)
-            if let event = self.receiver.recv()? {
-                state.handle(&event)?;
-            }
-            if state.exited() {
-                self.exited.store(true, Ordering::Relaxed);
-                stdout()
-                    .queue(crossterm::terminal::LeaveAlternateScreen)?
-                    .flush()?;
-                crossterm::terminal::disable_raw_mode()?;
-                break
-            }
-            //std::thread::sleep(sleep);
-        }
         Ok(())
     }
 
 }
 
-pub struct Notifications;
+pub struct Notifications(mpsc::Sender<self::Event>);
 
 impl NotificationHandler for Notifications {
     fn thread_init (&self, _: &Client) {

src/sequencer/render.rs

@@ -18,7 +18,7 @@ const KEYS: [&'static str; 6] = [
 impl WidgetRef for Sequencer {
     fn render_ref (&self, area: Rect, buf: &mut Buffer) {
         render_sequence_header(area, buf);
-        render_sequence_keys(area, buf, &self.sequence);
+        render_sequence_keys(area, buf, &self.transport.query().unwrap(), &self.sequence);
         render_sequence_cursor(area, buf, self.cursor);
         let cursor = self.cursor;
     }
@@ -34,9 +34,25 @@ fn render_sequence_header (
 }
 
 fn render_sequence_keys (
-    area: Rect, buf: &mut Buffer, sequence: &Arc<Mutex<Vec<Vec<Option<super::Event>>>>>
+    area: Rect,
+    buf: &mut Buffer,
+    transport: &::jack::TransportStatePosition,
+    sequence: &Arc<Mutex<Vec<Vec<Option<super::Event>>>>>
 ) {
+    //let transport = state.transport.query()?;
+    let frame  = transport.pos.frame();
+    let rate   = transport.pos.frame_rate().unwrap();
+    let second = (frame as f64) / (rate as f64);
+    let minute = second / 60f64;
+    let bpm    = 120f64;
+    let div    = 4;
+    let beats  = minute * bpm;
+    let bars   = beats as u32 / div as u32;
+    let beat   = beats as u32 % div as u32 + 1;
+    let beat_sub = beats % 1.0;
+
     let sequence = sequence.lock().unwrap();
+
     for key in 0..12 {
         buf.set_string(area.x - 3, area.y + 1 + key, KEYS[(key % 6) as usize],
             Style::default().dim());
@@ -53,6 +69,13 @@ fn render_sequence_keys (
         buf.set_string(area.x + 48, area.y + 1 + key, "┊",
             Style::default().black().dim());
         for step in 0..64 {
+
+            //let bg = if x as u32 == (beat - 1) * 16 + (beat_sub * 16.0) as u32 {
+                //crossterm::style::Color::Black
+            //} else {
+                //crossterm::style::Color::Reset
+            //};
+
             let top = sequence[(key * 2) as usize][step].is_some();
             let bottom = sequence[(key * 2 + 1) as usize][step].is_some();
             match (top, bottom) {