events: implement a first attempt at an eventing system

src/render.rs

@@ -1,5 +1,6 @@
 use rgb::Rgb;
 
+use crate::events::{Event, EventBus};
 use crate::geometry::*;
 use crate::lib8::interpolate::Fract8Ops;
 use crate::power::AsMilliwatts;
@@ -42,6 +43,7 @@ pub trait Surface: Send + Sync {
 }
 
 pub trait Output: Sample + Send {
+    fn on_event(&mut self, event: &Event);
     fn blank(&mut self);
     fn commit(&mut self);
 }
@@ -70,17 +72,22 @@ impl<T: Output, S: Surfaces> Renderer<T, S> {
 impl<T: Output, S: Surfaces> Task for Renderer<T, S> {
     fn name(&self) -> &'static str { "Renderer" }
 
-    fn tick(&mut self) {
-        self.output.blank();
+    fn tick(&mut self, event: &Event, _bus: &mut EventBus) {
+        match event {
+            crate::events::Event::Tick => {
+                self.output.blank();
 
-        self.surfaces.render_to(&mut self.output, self.frame);
-
-        self.output.commit();
-
-        self.fps.insert(1);
-        self.frame += 1;
-        self.fps_display.run(|| {
-            log::info!("FPS: {}", self.fps.measurement());
-        });
+                self.surfaces.render_to(&mut self.output, self.frame);
+        
+                self.output.commit();
+        
+                self.fps.insert(1);
+                self.frame += 1;
+                self.fps_display.run(|| {
+                    log::info!("FPS: {}", self.fps.measurement());
+                });
+            },
+            _ => self.output.on_event(event)
+        }
     }
 }