keymap macros

src/device/launcher.rs

@@ -12,54 +12,14 @@ impl Launcher {
     }
 }
 
-pub fn process (
+pub fn process (_: &mut Launcher, _: &Client, _: &ProcessScope) -> Control {
-    client: &Client,
-    scope:  &ProcessScope
-) -> Control {
     Control::Continue
 }
 
-pub fn render (state: &Launcher, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
+pub fn render (_: &Launcher, _: &mut Buffer, _: Rect) -> Usually<Rect> {
     Ok(Rect::default())
 }
 
-pub fn handle (state: &mut Launcher, event: &Event) -> Result<(), Box<dyn Error>> {
+pub fn handle (_: &mut Launcher, _: &AppEvent) -> Result<(), Box<dyn Error>> {
     Ok(())
 }
-        //let mut x = areas[1].x;
-        //for (index, track) in [
-            //"Track 1",
-            //"Track 2",
-            //"Track 3",
-            //"Track 4",
-            //"Track 5",
-            //"Bus 1",
-            //"Bus 2",
-            //"Mix",
-        //].iter().enumerate() {
-            //buffer.set_string(
-                //x + 10 * (index + 1) as u16, areas[1].y,
-                //"┬", Style::default().not_bold().dim()
-            //);
-            //buffer.set_string(
-                //x + 10 * (index + 1) as u16, areas[1].y + areas[1].height - 1,
-                //"┴", Style::default().not_bold().dim()
-            //);
-            //for y in areas[1].y+1..areas[1].y+areas[1].height - 1 {
-                //buffer.set_string(
-                    //x + 10 * (index + 1) as u16, y,
-                    //"│", Style::default().not_bold().gray().dim()
-                //);
-            //}
-            //for y in areas[1].y+2..areas[1].y+areas[1].height - 1 {
-                //buffer.set_string(
-                    //x + 10 * index as u16 + 1, y,
-                    //"--------", Style::default().not_bold().gray().dim()
-                //);
-            //}
-            //buffer.set_string(
-                //x + 10 * index as u16 + 1, areas[1].y + 1,
-                //track, Style::default().bold().not_dim()
-            //);
-        //}
-

src/device/looper.rs

@@ -12,28 +12,15 @@ impl Looper {
     }
 }
 
-pub fn process (
+pub fn process (_: &mut Looper, _: &Client, _: &ProcessScope) -> Control {
-    state:  &mut Looper,
-    client: &Client,
-    scope:  &ProcessScope
-) -> Control {
     Control::Continue
 }
 
-pub fn render (state: &Looper, buf: &mut Buffer, area: Rect)
+pub fn render (_: &Looper, _: &mut Buffer, _: Rect) -> Usually<Rect> {
-    -> Usually<Rect>
-{
-    //let move_to = |col, row| MoveTo(offset.0 + col, offset.1 + row);
-    //stdout
-        //.queue(move_to(0,  0))?.queue(Print(" Name       Input   Length     Route"))?
-        //.queue(move_to(0,  1))?.queue(PrintStyledContent(" Metronome  [ ]     ████       Track 1".bold()))?
-        //.queue(move_to(0,  2))?.queue(PrintStyledContent(" Loop 1     [ ]     ████       Track 1".bold()))?
-        //.queue(move_to(0,  3))?.queue(PrintStyledContent(" Loop 2     [ ]     ████████   Track 2".bold()))?
-        //.queue(move_to(0,  4))?.queue(PrintStyledContent(" Loop 3     [ ]     ████████   Track 3".bold()))?;
     Ok(Rect::default())
 }
 
-pub fn handle (state: &mut Looper, event: &AppEvent) -> Result<(), Box<dyn Error>> {
+pub fn handle (_: &mut Looper, _: &AppEvent) -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 

src/device/mixer.rs

@@ -29,9 +29,9 @@ impl Mixer {
 }
 
 pub fn process (
-    mixer:  &mut Mixer,
+    _: &mut Mixer,
-    client: &Client,
+    _: &Client,
-    scope:  &ProcessScope
+    _: &ProcessScope
 ) -> Control {
     Control::Continue
 }

src/device/plugin.rs

@@ -12,7 +12,7 @@ impl Plugin {
     }
 }
 
-pub fn process (state: &mut Plugin, client: &Client, scope: &ProcessScope) -> Control {
+pub fn process (_: &mut Plugin, _: &Client, _: &ProcessScope) -> Control {
     Control::Continue
 }
 
@@ -31,6 +31,6 @@ pub fn render (state: &Plugin, buf: &mut Buffer, Rect { x, y, width, height }: R
     Ok(Rect { x, y, width: 40, height: 7 })
 }
 
-pub fn handle (state: &mut Plugin, event: &AppEvent) -> Result<(), Box<dyn Error>> {
+pub fn handle (_: &mut Plugin, _: &AppEvent) -> Result<(), Box<dyn Error>> {
     Ok(())
 }

src/device/sequencer.rs

@@ -5,37 +5,47 @@ type Sequence = std::collections::BTreeMap<u32, Vec<::midly::MidiMessage>>;
 
 pub struct Sequencer {
     name:            String,
-    mode:            SequencerView,
-    note_axis:       (u16, u16),
-    note_cursor:     u16,
-    time_axis:       (u16, u16),
-    time_cursor:     u16,
-    rate:            Hz,
-    tempo:           Tempo,
     transport:       ::jack::Transport,
-    input_port:      Port<MidiIn>,
+    /// Samples per second
-    input_connect:   Vec<String>,
+    rate:            Hz,
-    output_port:     Port<MidiOut>,
+    /// Beats per minute
-    output_connect:  Vec<String>,
+    tempo:           Tempo,
-    /// Play sequence to output.
-    playing:         bool,
-    /// Write input to sequence.
-    recording:       bool,
-    /// Don't delete when recording.
-    overdub:         bool,
-    /// Red keys on piano roll.
-    notes_on:        Vec<bool>,
     /// MIDI resolution (a.k.a. PPQ)
     ticks_per_beat: u64,
     /// Sequencer resolution, e.g. 16 steps per beat.
     steps_per_beat:  u64,
     /// Steps in sequence, e.g. 64 16ths = 4 beat loop.
     steps:           u64,
+    input_port:      Port<MidiIn>,
+    input_connect:   Vec<String>,
+    /// Play input through output.
+    monitoring:      bool,
+    /// Red keys on piano roll.
+    notes_on:        Vec<bool>,
+    /// Write input to sequence.
+    recording:       bool,
     /// Map: tick -> MIDI events at tick
     sequence:        Sequence,
+    /// Don't delete when recording.
+    overdub:         bool,
+    /// Play sequence to output.
+    playing:         bool,
+    output_port:     Port<MidiOut>,
+    output_connect:  Vec<String>,
+
+    /// Display mode
+    mode:            SequencerView,
+    /// Range of notes to display
+    note_axis:       (u16, u16),
+    /// Position of cursor within note range
+    note_cursor:     u16,
+    /// Range of time steps to display
+    time_axis:       (u16, u16),
+    /// Position of cursor within time range
+    time_cursor:     u16,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 enum SequencerView {
     Tiny,
     Compact,
@@ -55,19 +65,20 @@ impl Sequencer {
             time_cursor:     0,
             rate:            Hz(client.sample_rate() as u32),
             tempo:           Tempo(120000),
-            transport:       client.transport(),
-            input_port:      client.register_port("in", MidiIn::default())?,
-            input_connect:   vec!["nanoKEY Studio * (capture): *".into()],
-            output_port:     client.register_port("out", MidiOut::default())?,
-            output_connect:  vec![],
-            sequence:        std::collections::BTreeMap::new(),
-            playing:         true,
-            recording:       true,
-            overdub:         true,
-            notes_on:        vec![false;128],
             ticks_per_beat:  96,
             steps_per_beat:  8,
             steps:           64,
+            transport:       client.transport(),
+            input_port:      client.register_port("in", MidiIn::default())?,
+            input_connect:   vec!["nanoKEY Studio * (capture): *".into()],
+            monitoring:      true,
+            notes_on:        vec![false;128],
+            playing:         true,
+            recording:       true,
+            sequence:        std::collections::BTreeMap::new(),
+            overdub:         true,
+            output_port:     client.register_port("out", MidiOut::default())?,
+            output_connect:  vec![],
         }).activate(client)
     }
 
@@ -101,47 +112,6 @@ impl Sequencer {
     #[inline] fn tps (&self) -> f64 {
         self.bps() * self.tpb()
     }
-    /// Ticks per loop яснота
-    #[inline] fn tpl (&self) -> f64 {
-        self.tpb() * self.steps as f64 / self.steps_per_beat as f64
-    }
-
-    /// Length of sequence in beat notes and remainder.
-    #[inline] fn beats (&self) -> (u64, u64) {
-        (self.steps / self.steps_per_beat, self.steps % self.steps_per_beat)
-    }
-    /// Length of sequence in ticks, rounded down.
-    #[inline] fn ticks (&self) -> u64 {
-        self.steps * self.ticks_per_beat / self.steps_per_beat
-    }
-    /// Length of sequence in frames.
-    #[inline] fn frames (&self) -> u64 {
-        self.steps * self.usec_per_step().0
-    }
-    /// Ticks per step, rounded down.
-    #[inline] fn ticks_per_step (&self) -> u64 {
-        self.ticks_per_beat / self.steps_per_beat
-    }
-    /// Microseconds per step for current tempo.
-    #[inline] fn usec_per_step (&self) -> Usec {
-        self.tempo.usec_per_step(self.steps_per_beat as u64)
-    }
-    /// Microseconds per tick for current tempo.
-    #[inline] fn usec_per_tick (&self) -> Usec {
-        Usec(self.tempo.usec_per_beat().0 / self.ticks_per_beat)
-    }
-    /// Convert frame to microsecond for current sample rate.
-    #[inline] fn frame_to_usec (&self, frame: u32) -> Usec {
-        Frame(frame).to_usec(&self.rate)
-    }
-    /// Convert frame to tick for current sample rate, tempo, and PPQ. 
-    #[inline] fn frame_to_tick (&self, frame: Frames) -> u32 {
-        (self.frame_to_usec(frame).0 / self.usec_per_tick().0) as u32
-    }
-    /// Convert tick to usec for current sample rate, tempo, and PPQ. 
-    #[inline] fn tick_to_usec (&self, tick: u32) -> u32 {
-        (tick as u64 * self.usec_per_tick().0) as u32
-    }
 
     fn frames_to_ticks (&self, start: u64, end: u64) -> Vec<(u64, u64)> {
         let fpl             = self.fpl() as u64;
@@ -254,9 +224,7 @@ fn process_out (s: &mut Sequencer, scope: &ProcessScope) {
     }
 }
 
-fn render (s: &Sequencer, buf: &mut Buffer, area: Rect)
+fn render (s: &Sequencer, buf: &mut Buffer, area: Rect) -> Usually<Rect> {
-    -> Usually<Rect>
-{
     let Rect { x, y, width, .. } = area;
     let (time0, time1) = s.time_axis;
     let (note0, note1) = s.note_axis;
@@ -289,7 +257,7 @@ fn render (s: &Sequencer, buf: &mut Buffer, area: Rect)
         x,
         y,
         width:  header.width.max(piano.width),
-        height: header.height + piano.height + 1
+        height: header.height + piano.height + 3
     }))
 }
 
@@ -398,7 +366,7 @@ fn draw_vertical (s: &Sequencer, buf: &mut Buffer, area: Rect, beat: u64) -> Usu
             }
         }
         if beat % s.steps == step as u64 {
-            buf.set_string(x + 39 - 2, y, if beat % 2 == 0 { "▀" } else { "▄" }, Style::default().yellow());
+            buf.set_string(x + 4, y, if beat % 2 == 0 { "▀" } else { "▄" }, Style::default().yellow());
             for key in note0..note1 {
                 let color = if s.notes_on[key as usize] {
                     Style::default().red()
@@ -408,13 +376,24 @@ fn draw_vertical (s: &Sequencer, buf: &mut Buffer, area: Rect, beat: u64) -> Usu
             }
         }
     }
+    let height = (time1-time0)/2;
+    buf.set_string(x + 2, y + height + 1, format!(
+        "Q 1/{} | N {} ({}-{}) | T {} ({}-{})",
+        4 * s.steps_per_beat,
+        s.note_axis.0 + s.note_cursor,
+        s.note_axis.0,
+        s.note_axis.1 - 1,
+        s.time_axis.0 + s.time_cursor + 1,
+        s.time_axis.0 + 1,
+        s.time_axis.1,
+    ), Style::default().dim());
     buf.set_string(
         x + 5 + s.note_cursor,
         y + s.time_cursor / 2,
         if s.time_cursor % 2 == 0 { "▀" } else { "▄" },
         Style::default()
     );
-    Ok(Rect { x, y, width: area.width, height: (time1-time0)/2 })
+    Ok(Rect { x, y, width: area.width, height })
 }
 
 fn contains_note_on (sequence: &Sequence, k: ::midly::num::u7, start: u32, end: u32) -> bool {
@@ -462,50 +441,55 @@ fn draw_horizontal (s: &Sequencer, buf: &mut Buffer, area: Rect) -> Usually<Rect
             }
         }
     }
+    let height = 32.max(note1 - note0) / 2;
+    buf.set_string(x + 2, y + height + 1, format!(
+        "   Q 1/{} | N {} ({}-{}) | T {} ({}-{})",
+        4 * s.steps_per_beat,
+        s.note_axis.0 + s.note_cursor,
+        s.note_axis.0,
+        s.note_axis.1 - 1,
+        s.time_axis.0 + s.time_cursor + 1,
+        s.time_axis.0 + 1,
+        s.time_axis.1,
+    ), Style::default().dim());
     buf.set_string(
         x + 5 + s.time_cursor,
         y + s.note_cursor / 2,
         if s.note_cursor % 2 == 0 { "▀" } else { "▄" },
         Style::default()
     );
-    Ok(Rect { x, y, width: time1 - time0 + 6, height: 32.max(note1 - note0) / 2 })
+    Ok(Rect { x, y, width: time1 - time0 + 6, height})
 }
 
 pub fn handle (s: &mut Sequencer, event: &AppEvent) -> Result<(), Box<dyn Error>> {
-    match event {
+    handle_keymap(COMMANDS, s, event)
-        AppEvent::Input(Event::Key(event)) => {
-            for (code, _, _, command) in COMMANDS.iter() {
-                if *code == event.code {
-                    command(s);
-                    break
-                }
-            }
-        },
-        _ => {}
-    };
-    Ok(())
 }
 
-const COMMANDS: [(KeyCode, &'static str, &'static str, &'static dyn Fn(&mut Sequencer));18] = [
+pub const COMMANDS: &'static [KeyBinding<Sequencer>] = keymap!(Sequencer {
-    (KeyCode::Up,        "cursor_up",    "move cursor up",           &cursor_up),
+    [Up,        NONE,  "cursor_up",     "move cursor up",           cursor_up],
-    (KeyCode::Down,      "cursor_down",  "move cursor down",         &cursor_down),
+    [Down,      NONE,  "cursor_down",   "move cursor down",         cursor_down],
-    (KeyCode::Left,      "cursor_left",  "move cursor left",         &cursor_left),
+    [Left,      NONE,  "cursor_left",   "move cursor left",         cursor_left],
-    (KeyCode::Right,     "cursor_right", "move cursor right",        &cursor_right),
+    [Right,     NONE,  "cursor_right",  "move cursor right",        cursor_right],
-    (KeyCode::Char(']'), "cursor_inc",   "increase note duration",   &cursor_inc),
+    [Char(']'), NONE,  "cursor_inc",    "increase note duration",   cursor_duration_inc],
-    (KeyCode::Char('['), "cursor_dec",   "decrease note duration",   &cursor_dec),
+    [Char('['), NONE,  "cursor_dec",    "decrease note duration",   cursor_duration_dec],
-    (KeyCode::Char('`'), "mode_next",    "next view mode",           &mode_next),
+    [Char('`'), NONE,  "mode_next",     "Next view mode",           mode_next],
-    (KeyCode::Tab,       "mode_prev",    "previous view mode",       &mode_prev),
+    [Char('+'), NONE,  "zoom_in",       "Zoom in",                  nop],
-    (KeyCode::Char('+'), "zoom_in",      "Zoom in",                  &nop),
+    [Char('-'), NONE,  "zoom_out",      "Zoom out",                 nop],
-    (KeyCode::Char('-'), "zoom_out",     "Zoom out",                 &nop),
+    [Char('a'), NONE,  "note_add",      "Add note",                 note_add],
-    (KeyCode::Char('a'), "note_add",     "Add note",                 &note_add),
+    [Char('d'), NONE,  "note_del",      "Delete note",              note_del],
-    (KeyCode::Char('d'), "note_del",     "Delete note",              &note_del),
+    [CapsLock,  NONE,  "advance",       "Toggle auto advance",      nop],
-    (KeyCode::CapsLock,  "advance",      "Toggle auto advance",      &nop),
+    [Char('w'), NONE,  "rest",          "Advance by note duration", nop],
-    (KeyCode::Char('w'), "rest",         "Advance by note duration", &nop),
+    [Char('r'), NONE,  "record",        "Toggle recodring",         toggle_record],
-    (KeyCode::Char('r'), "record",       "Toggle recodring",         &toggle_record),
+    [Char('o'), NONE,  "overdub",       "Toggle overdub",           toggle_overdub],
-    (KeyCode::Char('o'), "overdub",      "Toggle overdub",           &toggle_overdub),
+    [Char('p'), NONE,  "play",          "Toggle play/pause",        toggle_play],
-    (KeyCode::Char('p'), "play",         "Toggle play/pause",        &toggle_play),
+    [Char('s'), NONE,  "stop",          "Stop and rewind",          stop_and_rewind],
-    (KeyCode::Char('s'), "stop",         "Stop and rewind",          &nop),
+    [Char('q'), NONE,  "quantize_next", "Next quantize value",      quantize_next],
-];
+    [Char('Q'), SHIFT, "quantize_prev", "Previous quantize value",  quantize_prev],
+    [Char('n'), NONE,  "note_axis",     "Focus note axis",          nop],
+    [Char('t'), NONE,  "time_axis",     "Focus time axis",          nop],
+    [Char('v'), NONE,  "variations",    "Focus variation selector", nop],
+    [Char('s'), SHIFT, "sync",          "Focus sync selector",      nop]
+});
 
 fn nop (_: &mut Sequencer) {
 }
@@ -532,21 +516,33 @@ fn note_add (s: &mut Sequencer) {
 }
 fn note_del (_: &mut Sequencer) {
 }
-fn cursor_up (s: &mut Sequencer) {
+fn time_cursor_inc (s: &mut Sequencer) {
     let time = s.time_axis.1 - s.time_axis.0;
+    s.time_cursor = ((time + s.time_cursor) + 1) % time
+}
+fn time_cursor_dec (s: &mut Sequencer) {
+    let time = s.time_axis.1 - s.time_axis.0;
+    s.time_cursor = ((time + s.time_cursor) - 1) % time
+}
+fn note_cursor_inc (s: &mut Sequencer) {
     let note = s.note_axis.1 - s.note_axis.0;
+    s.note_cursor = ((note + s.note_cursor) + 1) % note
+}
+fn note_cursor_dec (s: &mut Sequencer) {
+    let note = s.note_axis.1 - s.note_axis.0;
+    s.note_cursor = ((note + s.note_cursor) - 1) % note
+}
+fn cursor_up (s: &mut Sequencer) {
     match s.mode {
-        SequencerView::Vertical   => { s.time_cursor = ((time + s.time_cursor) - 1) % time },
+        SequencerView::Vertical   => time_cursor_dec(s),
-        SequencerView::Horizontal => { s.note_cursor = ((note + s.note_cursor) - 1) % note },
+        SequencerView::Horizontal => note_cursor_dec(s),
         _ => unimplemented!()
     }
 }
 fn cursor_down (s: &mut Sequencer) {
-    let time = s.time_axis.1 - s.time_axis.0;
-    let note = s.note_axis.1 - s.note_axis.0;
     match s.mode {
-        SequencerView::Vertical   => { s.time_cursor = ((time + s.time_cursor) + 1) % time },
+        SequencerView::Vertical   => time_cursor_inc(s),
-        SequencerView::Horizontal => { s.note_cursor = ((note + s.note_cursor) + 1) % note },
+        SequencerView::Horizontal => note_cursor_inc(s),
         _ => unimplemented!()
     }
 }
@@ -554,8 +550,8 @@ fn cursor_left (s: &mut Sequencer) {
     let time = s.time_axis.1 - s.time_axis.0;
     let note = s.note_axis.1 - s.note_axis.0;
     match s.mode {
-        SequencerView::Vertical   => { s.note_cursor = ((note + s.note_cursor) - 1) % note }, 
+        SequencerView::Vertical   => note_cursor_dec(s),
-        SequencerView::Horizontal => { s.time_cursor = ((time + s.time_cursor) - 1) % time },
+        SequencerView::Horizontal => time_cursor_dec(s),
         _ => unimplemented!()
     }
 }
@@ -563,22 +559,31 @@ fn cursor_right (s: &mut Sequencer) {
     let time = s.time_axis.1 - s.time_axis.0;
     let note = s.note_axis.1 - s.note_axis.0;
     match s.mode {
-        SequencerView::Vertical   => { s.note_cursor = ((note + s.note_cursor) + 1) % note },
+        SequencerView::Vertical   => note_cursor_inc(s),
-        SequencerView::Horizontal => { s.time_cursor = ((time + s.time_cursor) + 1) % time },
+        SequencerView::Horizontal => time_cursor_inc(s),
         _ => unimplemented!()
     }
 }
-fn cursor_inc (s: &mut Sequencer) {
+fn cursor_duration_inc (s: &mut Sequencer) {
     //s.cursor.2 = s.cursor.2 + 1
 }
-fn cursor_dec (s: &mut Sequencer) {
+fn cursor_duration_dec (s: &mut Sequencer) {
     //if s.cursor.2 > 0 { s.cursor.2 = s.cursor.2 - 1 }
 }
 fn mode_next (s: &mut Sequencer) {
-    s.mode = SequencerView::Horizontal
+    s.mode = s.mode.next()
 }
-fn mode_prev (s: &mut Sequencer) {
+impl SequencerView {
-    s.mode = SequencerView::Vertical
+    fn next (&self) -> Self {
+        match self {
+            Self::Horizontal => Self::Vertical,
+            Self::Vertical   => Self::Horizontal,
+            _ => self.clone()
+        }
+    }
+}
+fn stop_and_rewind (s: &mut Sequencer) {
+    s.playing = false
 }
 fn toggle_play (s: &mut Sequencer) {
     s.playing = !s.playing
@@ -589,6 +594,16 @@ fn toggle_record (s: &mut Sequencer) {
 fn toggle_overdub (s: &mut Sequencer) {
     s.overdub = !s.overdub
 }
+fn quantize_next (s: &mut Sequencer) {
+    if s.steps_per_beat < 64 {
+        s.steps_per_beat = s.steps_per_beat * 2
+    }
+}
+fn quantize_prev (s: &mut Sequencer) {
+    if s.steps_per_beat > 1 {
+        s.steps_per_beat = s.steps_per_beat / 2
+    }
+}
 
 #[cfg(test)] mod test {
     use super::*;

src/layout.rs

@@ -46,9 +46,7 @@ impl Device for Rows {
                         self.focused = true;
                         self.items[self.focus].handle(&AppEvent::Blur)?;
                     },
-                    _ => {
+                    _ => {}
-                        println!("{event:?}");
-                    }
                 },
                 _ => {}
             }
@@ -94,9 +92,42 @@ impl Columns {
 
 impl Device for Columns {
     fn handle (&mut self, event: &AppEvent) -> Usually<()> {
-        if self.focused {
+        if !self.focused {
-            self.items[self.focus].handle(event)
+            match event {
+                AppEvent::Input(Event::Key(KeyEvent { code: KeyCode::Esc, .. })) => {
+                    self.focused = true;
+                    self.items[self.focus].handle(&AppEvent::Blur)?;
+                    Ok(())
+                },
+                _ => self.items[self.focus].handle(event)
+            }
         } else {
+            match event {
+                AppEvent::Input(event) => match event {
+                    Event::Key(KeyEvent { code: KeyCode::Left, .. }) => {
+                        if self.focus == 0 {
+                            self.focus = self.items.len();
+                        }
+                        self.focus = self.focus - 1;
+                    },
+                    Event::Key(KeyEvent { code: KeyCode::Right, .. }) => {
+                        self.focus = self.focus + 1;
+                        if self.focus >= self.items.len() {
+                            self.focus = 0;
+                        }
+                    },
+                    Event::Key(KeyEvent { code: KeyCode::Enter, .. }) => {
+                        self.focused = false;
+                        self.items[self.focus].handle(&AppEvent::Focus)?;
+                    },
+                    Event::Key(KeyEvent { code: KeyCode::Esc, .. }) => {
+                        self.focused = true;
+                        self.items[self.focus].handle(&AppEvent::Blur)?;
+                    },
+                    _ => {}
+                },
+                _ => {}
+            }
             Ok(())
         }
     }
@@ -111,7 +142,7 @@ impl Device for Columns {
                 height: area.height
             })?;
             if self.focused && i == self.focus {
-                draw_box_styled(buf, result, Some(Style::default().yellow()));
+                draw_box_styled(buf, result, Some(Style::default().green()));
             }
             w = w + result.width;
             h = h.max(result.height);

src/main.rs

@@ -13,8 +13,8 @@ pub mod config;
 pub mod layout;
 pub mod time;
 
-use crate::device::{Sequencer, Transport};
+use crate::device::*;
-use crate::layout::Rows;
+use crate::layout::*;
 
 fn main () -> Result<(), Box<dyn Error>> {
     let _cli = cli::Cli::parse();
@@ -33,8 +33,12 @@ fn main () -> Result<(), Box<dyn Error>> {
             //])?),
         //])),
         //Box::new(Mixer::new("Mixer#000")?),
-        Box::new(Sequencer::new("Melody#000")?),
         Box::new(Transport::new("Transport")?),
+        Box::new(Columns::new(true, vec![
+            Box::new(Sequencer::new("Melody#000")?),
+            Box::new(Sequencer::new("Melody#001")?),
+            Box::new(Sequencer::new("Rhythm#000")?),
+        ])),
         //Box::new(Sequencer::new("Rhythm#000")?),
     ]))
 }

src/prelude.rs

@@ -85,3 +85,40 @@ pub type BoxedNotificationHandler = Box<dyn Fn(AppEvent) + Send>;
 pub type BoxedProcessHandler = Box<dyn FnMut(&Client, &ProcessScope)-> Control + Send>;
 
 pub type Jack<N> = AsyncClient<N, ClosureProcessHandler<BoxedProcessHandler>>;
+
+pub type KeyBinding<T> = (
+    KeyCode, KeyModifiers, &'static str, &'static str, &'static dyn Fn(&mut T)
+);
+
+#[macro_export] macro_rules! key {
+    ($k:ident $(($char:literal))?, $m:ident, $n: literal, $d: literal, $f: ident) => {
+        (KeyCode::$k $(($char))?, KeyModifiers::$m, $n, $d, &$f)
+    };
+}
+
+#[macro_export] macro_rules! keymap {
+    ($T:ty { $([$k:ident $(($char:literal))?, $m:ident, $n: literal, $d: literal, $f: ident]),* }) => {
+        &[
+            $((KeyCode::$k $(($char))?, KeyModifiers::$m, $n, $d, &$f as &'static dyn Fn(&mut $T))),*
+        ] as &'static [KeyBinding<$T>]
+    }
+}
+
+pub use crate::{key, keymap};
+
+pub fn handle_keymap <T> (
+    commands: &[KeyBinding<T>], state: &mut T, event: &AppEvent
+) -> Result<(), Box<dyn Error>> {
+    match event {
+        AppEvent::Input(Event::Key(event)) => {
+            for (code, modifiers, _, _, command) in commands.iter() {
+                if *code == event.code && modifiers.bits() == event.modifiers.bits() {
+                    command(state);
+                    break
+                }
+            }
+        },
+        _ => {}
+    };
+    Ok(())
+}