task: rewrite event handling as a step towards event-based subscriptions

src/geometry.rs

@@ -64,19 +64,19 @@ impl<S: CoordinateSpace> Coordinates<S> {
         }
     }
 
-    fn top_left() -> Self {
+    const fn top_left() -> Self {
         Self::new(S::Data::MIN, S::Data::MIN)
     }
 
-    fn top_right() -> Self {
+    const fn top_right() -> Self {
         Self::new(S::Data::MAX, S::Data::MIN)
     }
 
-    fn bottom_left() -> Self {
+    const fn bottom_left() -> Self {
         Self::new(S::Data::MIN, S::Data::MAX)
     }
 
-    fn bottom_right() -> Self {
+    const fn bottom_right() -> Self {
         Self::new(S::Data::MAX, S::Data::MAX)
     }
 
@@ -101,15 +101,13 @@ pub struct Rectangle<Space: CoordinateSpace> {
 
 impl<Space: CoordinateSpace> Rectangle<Space> {
     pub const fn new(top_left: Coordinates<Space>, bottom_right: Coordinates<Space>) -> Self {
-        //debug_assert!(top_left.x <= bottom_right.x);
-        //debug_assert!(top_left.y <= bottom_right.y);
         Self {
             top_left,
             bottom_right
         }
     }
 
-    pub fn everything() -> Self {
+    pub const fn everything() -> Self {
         Self {
             top_left: Coordinates::<Space>::top_left(),
             bottom_right: Coordinates::<Space>::bottom_right()