wip: refactor pt.35 (16e) even more traits, even fewer structs

crates/tek_tui/src/tui_arranger.rs

@@ -290,6 +290,26 @@ impl HasTracks<ArrangerTrack> for ArrangerView<Tui> {
     fn tracks_mut (&mut self) -> &mut Vec<ArrangerTrack> {
         &mut self.tracks
     }
+    fn track_add (&mut self, name: Option<&str>, color: Option<ItemColor>)
+        -> Usually<&mut ArrangerTrack>
+    {
+        let name = name.map_or_else(||self.track_default_name(), |x|x.to_string());
+        let track = ArrangerTrack {
+            width:  name.len() + 2,
+            color:  color.unwrap_or_else(||ItemColor::random()),
+            player: MIDIPlayer::new(&self.jack(), &self.clock(), name.as_str())?,
+            name:   Arc::new(name.into()),
+        };
+        self.tracks_mut().push(track);
+        let index = self.tracks().len() - 1;
+        Ok(&mut self.tracks_mut()[index])
+    }
+    fn track_del (&mut self, index: usize) {
+        self.tracks_mut().remove(index);
+        for scene in self.scenes_mut().iter_mut() {
+            scene.clips.remove(index);
+        }
+    }
 }
 
 impl HasScenes<ArrangerScene> for ArrangerView<Tui> {
@@ -299,6 +319,19 @@ impl HasScenes<ArrangerScene> for ArrangerView<Tui> {
     fn scenes_mut (&mut self) -> &mut Vec<ArrangerScene> {
         &mut self.scenes
     }
+    fn scene_add (&mut self, name: Option<&str>, color: Option<ItemColor>)
+        -> Usually<&mut ArrangerScene>
+    {
+        let name = name.map_or_else(||self.scene_default_name(), |x|x.to_string());
+        let scene = ArrangerScene {
+            name:  Arc::new(name.into()),
+            clips: vec![None;self.tracks().len()],
+            color: color.unwrap_or_else(||ItemColor::random()),
+        };
+        self.scenes_mut().push(scene);
+        let index = self.scenes().len() - 1;
+        Ok(&mut self.scenes_mut()[index])
+    }
 }
 
 /// Display mode of arranger