Rethink workspace structure

src/input/button_state.rs

@@ -0,0 +1,24 @@
+/// The state of a button.
+///
+/// If you are using [`winit`], consider enabling the `winit` feature to get
+/// conversion implementations for free!
+///
+/// [`winit`]: https://docs.rs/winit/0.20.0-alpha3/winit/
+#[derive(Debug, Hash, Ord, PartialOrd, PartialEq, Eq, Clone, Copy)]
+pub enum ButtonState {
+    /// The button is pressed.
+    Pressed,
+
+    /// The button is __not__ pressed.
+    Released,
+}
+
+#[cfg(feature = "winit")]
+impl From<winit::event::ElementState> for ButtonState {
+    fn from(element_state: winit::event::ElementState) -> Self {
+        match element_state {
+            winit::event::ElementState::Pressed => ButtonState::Pressed,
+            winit::event::ElementState::Released => ButtonState::Released,
+        }
+    }
+}