refactor transport into render-only struct

src/device/launcher/mod.rs

@@ -180,22 +180,29 @@ pub fn process (state: &mut Launcher, _: &Client, _: &ProcessScope) -> Control {
 pub fn render (state: &Launcher, buf: &mut Buffer, mut area: Rect) -> Usually<Rect> {
     //area.width  = 80; // DOS mode
     //area.height = 25;
-    let Rect { x, y, width, height } = area;
-    {
-        use crate::device::transport::*;
-        draw_play_stop(buf, x + 1, y, &state.playing);
-        draw_rec(buf, x + 12, y, state.sequencer().map(|s|s.recording).unwrap_or(false));
-        draw_dub(buf, x + 19, y, state.sequencer().map(|s|s.overdub).unwrap_or(false));
-        draw_mon(buf, x + 26, y, state.sequencer().map(|s|s.monitoring).unwrap_or(false));
-        draw_bpm(buf, x + 33, y, state.timebase.bpm() as usize);
-        draw_timer(buf, x + width - 1, y, &state.timebase, state.current_frame);
-    }
-    let mut y = y + 1;
+    let Rect { x, mut y, width, height } = area;
+
+    y = y + crate::device::Transport {
+        timebase: &state.timebase,
+        playing:  state.playing,
+        record:   state.sequencer().map(|s|s.recording).unwrap_or(false),
+        overdub:  state.sequencer().map(|s|s.overdub).unwrap_or(false),
+        monitor:  state.sequencer().map(|s|s.monitoring).unwrap_or(false),
+        frame:    state.current_frame
+    }.render(buf, area)?.height;
+
     y = y + LauncherGrid::new(
         state, buf, Rect { x, y, width, height: height/3 }, state.view.is_tracks()
     ).draw()?.height;
-    y = y + draw_section_chains(state, buf, Rect { x, y, width, height: height/3 })?.height;
-    y = y + draw_section_sequencer(state, buf, Rect { x, y, width, height: height - y })?.height;
+
+    y = y + draw_section_chains(
+        state, buf, Rect { x, y, width, height: height/3 }
+    )?.height;
+
+    y = y + draw_section_sequencer(
+        state, buf, Rect { x, y, width, height: height - y }
+    )?.height;
+
     area.height = y;
     if state.show_help {
         let style = Some(Style::default().bold().white().not_dim().on_black().italic());

src/device/mod.rs

@@ -4,4 +4,4 @@ mod looper;    pub use self::looper::Looper;
 mod mixer;     pub use self::mixer::Mixer;
 mod sequencer; pub use self::sequencer::{Sequencer, Phrase};
 mod track;     pub use self::track::Track;
-mod transport;
+mod transport; pub use self::transport::Transport;

src/device/sequencer/mod.rs

@@ -157,19 +157,19 @@ fn render (s: &Sequencer, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
 pub fn draw_header (s: &Sequencer, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
     let Rect { x, y, width, .. } = area;
     let style = Style::default().gray();
-    crate::device::transport::draw_play_stop(buf, x + 2, y + 1, &s.playing);
+    crate::device::Transport {
+        timebase: &s.timebase,
+        playing:  s.playing,
+        record:   s.recording,
+        overdub:  s.overdub,
+        monitor:  s.monitoring,
+        frame:    0
+    }.render(buf, area)?;
     let separator = format!("├{}┤", "-".repeat((width - 2).into()));
     separator.blit(buf, x, y + 2, Some(style.dim()));
-    crate::device::transport::draw_rec(buf, x + 13, y + 1, s.recording);
-    crate::device::transport::draw_dub(buf, x + 20, y + 1, s.overdub);
-    crate::device::transport::draw_mon(buf, x + 27, y + 1, s.monitoring);
     let _ = draw_clips(s, buf, area)?;
     Ok(Rect { x, y, width, height: 3 })
 }
-pub fn draw_timer (buf: &mut Buffer, x: u16, y: u16, timer: &str) {
-    let style = Some(Style::default().gray().bold().not_dim());
-    timer.blit(buf, x - timer.len() as u16, y, style);
-}
 pub fn draw_clips (s: &Sequencer, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
     let Rect { x, y, .. } = area;
     let style = Style::default().gray();

src/device/transport.rs

@@ -1,6 +1,28 @@
 use crate::core::*;
 use crate::layout::*;
 
+pub struct Transport<'a> {
+    pub timebase: &'a Arc<Timebase>,
+    pub playing:  TransportState,
+    pub record:   bool,
+    pub overdub:  bool,
+    pub monitor:  bool,
+    pub frame:    usize,
+}
+
+impl<'a> Render for Transport<'a> {
+    fn render (&self, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
+        let Rect { x, y, width, .. } = area;
+        draw_play_stop(buf, x + 1, y, &self.playing);
+        draw_rec(buf, x + 12, y, self.record);
+        draw_dub(buf, x + 19, y, self.overdub);
+        draw_mon(buf, x + 26, y, self.monitor);
+        draw_bpm(buf, x + 33, y, self.timebase.bpm() as usize);
+        draw_timer(buf, x + width - 1, y, &self.timebase, self.frame);
+        Ok(Rect { x, y, width, height: 1 })
+    }
+}
+
 pub fn draw_timer (buf: &mut Buffer, x: u16, y: u16, timebase: &Arc<Timebase>, frame: usize) {
     let ppq = timebase.ppq() as usize;