bye DynamicDevice; now to reenable playback...

src/core.rs

@@ -15,10 +15,24 @@ pub use crossterm::event::{Event, KeyEvent, KeyCode, KeyModifiers};
 
 macro_rules! submod { ($($name:ident)*) => { $(mod $name; pub use self::$name::*;)* }; }
 
-submod!( device handle jack keymap midi port render run time );
+submod!( handle jack keymap midi port render run time );
 
 pub type Usually<T> = Result<T, Box<dyn Error>>;
 
+pub trait Component: Render + Handle {}
+
+impl<T: Render + Handle> Component for T {}
+
+/// A UI component that may have presence on the JACK grap.
+pub trait Device: Render + Handle + Ports + Send + Sync {
+    fn boxed (self) -> Box<dyn Device> where Self: Sized + 'static {
+        Box::new(self)
+    }
+}
+
+/// All things that implement the required traits can be treated as `Device`.
+impl<T: Render + Handle + Ports + Send + Sync> Device for T {}
+
 // Reexport macros:
 pub use crate::{
     render,