add Input and Output traits to Engine

crates/tek_core/src/engine.rs

@@ -7,21 +7,29 @@ pub trait App<T: Engine> {
 
 /// Platform backend.
 pub trait Engine: Send + Sync + Sized {
-    fn setup (&mut self) -> Usually<()> { Ok(()) }
-    fn exited (&self) -> bool;
-    fn teardown (&mut self) -> Usually<()> { Ok(()) }
+    type Input: Input<Self>;
+    type Handled;
+    type Output: Output<Self>;
 
-    /// Unit of distance.
     type Unit: Number;
     type Area: Area<Self::Unit> + From<[Self::Unit;4]> + Debug;
     type Size: Size<Self::Unit> + From<[Self::Unit;2]> + Debug;
 
-    type Input;
-    type Handled;
-    type Output: RenderTarget<Self>;
+    fn setup (&mut self) -> Usually<()> { Ok(()) }
+    fn exited (&self) -> bool;
+    fn teardown (&mut self) -> Usually<()> { Ok(()) }
 }
 
-pub trait RenderTarget<E: Engine> {
+pub trait Input<E: Engine> {
+    type Event;
+    fn event (&self)
+        -> Self::Event;
+    fn is_done (&self)
+        -> bool;
+    fn done (&self);
+}
+
+pub trait Output<E: Engine> {
     fn area (&self)
         -> E::Area;
     fn area_mut (&mut self)

crates/tek_core/src/tui.rs

@@ -21,12 +21,12 @@ pub struct Tui {
 }
 
 impl Engine for Tui {
-    type Unit     = u16;
-    type Size     = [Self::Unit;2];
-    type Area     = [Self::Unit;4];
-    type Input    = Self;
-    type Handled  = bool;
-    type Output   = Self;
+    type Unit    = u16;
+    type Size    = [Self::Unit;2];
+    type Area    = [Self::Unit;4];
+    type Input   = Self;
+    type Handled = bool;
+    type Output  = Self;
     fn exited (&self) -> bool {
         self.exited.fetch_and(true, Ordering::Relaxed)
     }
@@ -48,7 +48,19 @@ impl Engine for Tui {
         disable_raw_mode().map_err(Into::into)
     }
 }
-impl RenderTarget<Tui> for Tui {
+impl Input<Tui> for Tui {
+    type Event = TuiEvent;
+    fn event (&self) -> TuiEvent {
+        self.event.read().unwrap().clone().unwrap()
+    }
+    fn is_done (&self) -> bool {
+        self.exited.fetch_and(true, Ordering::Relaxed)
+    }
+    fn done (&self) {
+        self.exited.store(true, Ordering::Relaxed);
+    }
+}
+impl Output<Tui> for Tui {
     #[inline] fn area (&self) -> <Self as Engine>::Area {
         self.area
     }
@@ -136,9 +148,6 @@ impl Tui {
             std::thread::sleep(sleep);
         })
     }
-    pub fn event (&self) -> TuiEvent {
-        self.event.read().unwrap().clone().unwrap()
-    }
     pub fn buffer (&mut self) -> &mut Buffer {
         &mut self.buffers[self.buffer]
     }