wip: running interface in separate or combined mode

also disassociating render functions from state structs

src/mixer/handle.rs

@@ -0,0 +1,48 @@
+use crate::prelude::*;
+use super::Mixer;
+
+pub fn handle (
+    state: &mut Mixer,
+    event: crossterm::event::Event
+) -> Result<(), Box<dyn Error>> {
+    use crossterm::event::{Event, KeyCode, KeyModifiers};
+    if let Event::Key(event) = event {
+        match event.code {
+            KeyCode::Char('c') => {
+                if event.modifiers == KeyModifiers::CONTROL {
+                    state.exit = true;
+                }
+            },
+            KeyCode::Down => {
+                state.selected_track = (state.selected_track + 1) % state.tracks.len();
+                println!("{}", state.selected_track);
+            },
+            KeyCode::Up => {
+                if state.selected_track == 0 {
+                    state.selected_track = state.tracks.len() - 1;
+                } else {
+                    state.selected_track = state.selected_track - 1;
+                }
+                println!("{}", state.selected_track);
+            },
+            KeyCode::Left => {
+                if state.selected_column == 0 {
+                    state.selected_column = 6
+                } else {
+                    state.selected_column = state.selected_column - 1;
+                }
+            },
+            KeyCode::Right => {
+                if state.selected_column == 6 {
+                    state.selected_column = 0
+                } else {
+                    state.selected_column = state.selected_column + 1;
+                }
+            },
+            _ => {
+                println!("{event:?}");
+            }
+        }
+    }
+    Ok(())
+}