add focus proxy for sequencers

crates/tek_sequencer/src/main_arranger.rs

@@ -48,7 +48,8 @@ impl ArrangerCli {
             transport,
             show_sequencer: Some(tek_core::Direction::Down),
             arranger,
-            focus: 0
+            focus: 0,
+            sequencer_proxy: SequencerProxy(Default::default(), false)
         })))?;
         Ok(())
     }
@@ -61,8 +62,26 @@ struct ArrangerStandalone<E: Engine> {
     arranger:        Arranger<E>,
     /// This allows the sequencer view to be moved or hidden.
     show_sequencer:  Option<tek_core::Direction>,
-    /// 
+    /// Index of currently focused component
     focus:           usize,
+    /// Focus target that passes events down to sequencer
+    sequencer_proxy: SequencerProxy<E>,
+}
+impl<E: Engine> ArrangerStandalone<E> {
+    fn sequencer (&self) -> Option<&Sequencer<E>> {
+        if self.show_sequencer.is_some() {
+            self.arranger.sequencer()
+        } else {
+            None
+        }
+    }
+    fn sequencer_mut (&mut self) -> Option<&mut Sequencer<E>> {
+        if self.show_sequencer.is_some() {
+            self.arranger.sequencer_mut()
+        } else {
+            None
+        }
+    }
 }
 /// The standalone arranger consists of transport, clip grid, and sequencer.
 impl Content for ArrangerStandalone<Tui> {
@@ -94,6 +113,16 @@ impl Content for ArrangerStandalone<Tui> {
 /// Handle top-level events in standalone arranger.
 impl Handle<Tui> for ArrangerStandalone<Tui> {
     fn handle (&mut self, from: &TuiInput) -> Perhaps<bool> {
+        let focus        = self.focus;
+        let is_first_row = self.arranger.is_first_row();
+        let is_last_row  = self.arranger.is_last_row();
+        let mut focused_handle = || {
+            if focus == 2 {
+                self.arranger.sequencer_mut().handle(from)
+            } else {
+                self.focused_mut().handle(from)
+            }
+        };
         match from.event() {
             key!(KeyCode::Char(' ')) => {
                 if let Some(ref mut transport) = self.transport {
@@ -109,38 +138,55 @@ impl Handle<Tui> for ArrangerStandalone<Tui> {
                 self.focus_prev();
             },
             key!(KeyCode::Down) => {
-                if self.focus == 0 {
+                if focus == 0 {
                     self.focus_next();
-                } else if self.focus == 1 && self.arranger.is_last_row() {
+                } else if focus == 1 && is_last_row {
                     self.focus_next();
                 } else {
-                    return self.focused_mut().handle(from)
+                    return focused_handle()
                 }
             },
             key!(KeyCode::Up) => {
-                if self.focus == 1 && self.arranger.is_first_row() {
+                if focus == 1 && is_first_row {
                     self.focus_prev();
                 } else {
-                    return self.focused_mut().handle(from)
+                    return focused_handle()
                 }
             },
-            _ => return self.focused_mut().handle(from)
+            _ => return focused_handle()
         }
         Ok(Some(true))
     }
 }
 /// Focusable items in standalone arranger.
-impl Focus<2, Tui> for ArrangerStandalone<Tui> {
+impl Focus<3, Tui> for ArrangerStandalone<Tui> {
     fn focus (&self) -> usize {
         self.focus
     }
     fn focus_mut (&mut self) -> &mut usize {
         &mut self.focus
     }
-    fn focusable (&self) -> [&dyn Focusable<Tui>;2] {
+    fn focusable (&self) -> [&dyn Focusable<Tui>;3] {
-        focusables!(self.transport, self.arranger)
+        focusables!(self.transport, self.arranger, self.sequencer_proxy)
     }
-    fn focusable_mut (&mut self) -> [&mut dyn Focusable<Tui>;2] {
+    fn focusable_mut (&mut self) -> [&mut dyn Focusable<Tui>;3] {
-        focusables_mut!(self.transport, self.arranger)
+        focusables_mut!(self.transport, self.arranger, self.sequencer_proxy)
+    }
+}
+#[derive(Default)]
+struct SequencerProxy<E: Engine>(PhantomData<E>, bool);
+impl Handle<Tui> for SequencerProxy<Tui> {
+    fn handle (&mut self, _: &TuiInput) -> Perhaps<bool> { unreachable!() }
+}
+impl Content for SequencerProxy<Tui> {
+    type Engine = Tui;
+    fn content (&self) -> impl Widget<Engine = Tui> { "" }
+}
+impl Focusable<Tui> for SequencerProxy<Tui> {
+    fn is_focused (&self) -> bool {
+        self.1
+    }
+    fn set_focused (&mut self, focus: bool) {
+        self.1 = focus
     }
 }

crates/tek_sequencer/src/sequencer_tui.rs

@@ -885,6 +885,14 @@ impl Content for Sequencer<Tui> {
                 .fg(Color::Rgb(70, 80, 50))))
     }
 }
+impl Focusable<Tui> for Sequencer<Tui> {
+    fn is_focused (&self) -> bool {
+        self.focused
+    }
+    fn set_focused (&mut self, focused: bool) {
+        self.focused = focused
+    }
+}
 
 /// Colors of piano keys
 const KEY_COLORS: [(Color, Color);6] = [