wip: big flat pt.2: extract engine crate

engine/src/input.rs

@@ -0,0 +1,69 @@
+use crate::*;
+use std::sync::{Arc, Mutex, RwLock};
+
+/// Current input state
+pub trait Input<E: Engine> {
+    /// Type of input event
+    type Event;
+    /// Currently handled event
+    fn event (&self) -> &Self::Event;
+    /// Whether component should exit
+    fn is_done (&self) -> bool;
+    /// Mark component as done
+    fn done (&self);
+}
+
+#[macro_export] macro_rules! handle {
+    (<$E:ty>|$self:ident:$Struct:ty,$input:ident|$handler:expr) => {
+        impl Handle<$E> for $Struct {
+            fn handle (&mut $self, $input: &<$E as Engine>::Input) -> Perhaps<<$E as Engine>::Handled> {
+                $handler
+            }
+        }
+    }
+}
+
+/// Handle input
+pub trait Handle<E: Engine>: Send + Sync {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled>;
+}
+
+impl<E: Engine, H: Handle<E>> Handle<E> for &mut H {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        (*self).handle(context)
+    }
+}
+
+impl<E: Engine, H: Handle<E>> Handle<E> for Option<H> {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        if let Some(ref mut handle) = self {
+            handle.handle(context)
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+impl<H, E: Engine> Handle<E> for Mutex<H> where H: Handle<E> {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        self.get_mut().unwrap().handle(context)
+    }
+}
+
+impl<H, E: Engine> Handle<E> for Arc<Mutex<H>> where H: Handle<E> {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        self.lock().unwrap().handle(context)
+    }
+}
+
+impl<H, E: Engine> Handle<E> for RwLock<H> where H: Handle<E> {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        self.write().unwrap().handle(context)
+    }
+}
+
+impl<H, E: Engine> Handle<E> for Arc<RwLock<H>> where H: Handle<E> {
+    fn handle (&mut self, context: &E::Input) -> Perhaps<E::Handled> {
+        self.write().unwrap().handle(context)
+    }
+}