wip: p.43, e=22, almost 10kloc!

crates/tek_tui/src/tui_arranger_focus.rs

@@ -0,0 +1,74 @@
+use crate::*;
+
+/// Sections in the arranger app that may be focused
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub enum ArrangerFocus {
+    /// The transport (toolbar) is focused
+    Transport,
+    /// The arrangement (grid) is focused
+    Arranger,
+    /// The phrase list (pool) is focused
+    PhrasePool,
+    /// The phrase editor (sequencer) is focused
+    PhraseEditor,
+}
+
+impl FocusEnter for ArrangerApp<Tui> {
+    fn focus_enter (&mut self) {
+        use AppViewFocus::*;
+        use ArrangerFocus::*;
+        let focused = self.focused();
+        if !self.entered {
+            self.entered = focused == Content(Arranger);
+            self.app.editor.entered  = focused == Content(PhraseEditor);
+            self.app.phrases.entered = focused == Content(PhrasePool);
+        }
+    }
+    fn focus_exit (&mut self) {
+        if self.entered {
+            self.entered = false;
+            self.app.editor.entered  = false;
+            self.app.phrases.entered = false;
+        }
+    }
+    fn focus_entered (&self) -> Option<Self::Item> {
+        if self.entered {
+            Some(self.focused())
+        } else {
+            None
+        }
+    }
+}
+
+/// Focus layout of arranger app
+impl FocusGrid for ArrangerApp<Tui> {
+    type Item = AppViewFocus<ArrangerFocus>;
+    fn focus_cursor (&self) -> (usize, usize) {
+        self.cursor
+    }
+    fn focus_cursor_mut (&mut self) -> &mut (usize, usize) {
+        &mut self.cursor
+    }
+    fn focus_layout (&self) -> &[&[Self::Item]] {
+        use AppViewFocus::*;
+        use ArrangerFocus::*;
+        &[
+            &[Menu,                Menu                 ],
+            &[Content(Transport),  Content(Transport)   ],
+            &[Content(Arranger),   Content(Arranger)    ],
+            &[Content(PhrasePool), Content(PhraseEditor)],
+        ]
+    }
+    fn focus_update (&mut self) {
+        use AppViewFocus::*;
+        use ArrangerFocus::*;
+        let focused = self.focused();
+        if let Some(mut status_bar) = self.status_bar {
+            status_bar.update(&(
+                self.focused(),
+                self.app.selected,
+                focused == Content(PhraseEditor) && self.entered
+            ))
+        }
+    }
+}