use main loop with input everywhere

src/sampler/handle.rs

@@ -10,7 +10,7 @@ pub fn handle (
         match event.code {
             KeyCode::Char('c') => {
                 if event.modifiers == KeyModifiers::CONTROL {
-                    state.exit = true;
+                    state.exit();
                 }
             },
             KeyCode::Down => {