1 files changed, 136 insertions, 0 deletions
diff --git a/engine/src/windowing/mouse.rs b/engine/src/windowing/mouse.rs
new file mode 100644
index 0000000..1afe594
--- /dev/null
+++ b/engine/src/windowing/mouse.rs
@@ -0,0 +1,136 @@
+use std::collections::HashMap;
+
+use ecs::Sole;
+
+use crate::vector::Vec2;
+
+#[derive(Debug, Default, Clone, Sole)]
+#[non_exhaustive]
+pub struct Motion
+{
+    pub position_delta: Vec2<f64>,
+}
+
+/// Mouse buttons.
+#[derive(Debug, Default, Sole)]
+pub struct Buttons
+{
+    map: HashMap<Button, ButtonData>,
+}
+
+impl Buttons
+{
+    pub fn get(&self, button: Button) -> ButtonState
+    {
+        let Some(button_data) = self.map.get(&button) else {
+            return ButtonState::Released;
+        };
+
+        button_data.current_state
+    }
+
+    pub fn get_previous(&self, button: Button) -> ButtonState
+    {
+        let Some(button_data) = self.map.get(&button) else {
+            return ButtonState::Released;
+        };
+
+        button_data.previous_state
+    }
+
+    pub fn set(&mut self, button: Button, button_state: ButtonState)
+    {
+        let button_data = self.map.entry(button).or_default();
+
+        button_data.current_state = button_state;
+    }
+
+    pub(crate) fn make_states_previous(&mut self)
+    {
+        for button_data in self.map.values_mut() {
+            button_data.previous_state = button_data.current_state;
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum Button
+{
+    Left,
+    Right,
+    Middle,
+    Back,
+    Forward,
+    Other(u16),
+}
+
+impl From<winit::event::MouseButton> for Button
+{
+    fn from(mouse_button: winit::event::MouseButton) -> Self
+    {
+        match mouse_button {
+            winit::event::MouseButton::Left => Self::Left,
+            winit::event::MouseButton::Right => Self::Right,
+            winit::event::MouseButton::Middle => Self::Middle,
+            winit::event::MouseButton::Back => Self::Back,
+            winit::event::MouseButton::Forward => Self::Forward,
+            winit::event::MouseButton::Other(other_mouse_button) => {
+                Self::Other(other_mouse_button)
+            }
+        }
+    }
+}
+
+/// Mouse button state.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum ButtonState
+{
+    Pressed,
+    Released,
+}
+
+impl ButtonState
+{
+    #[must_use]
+    #[inline]
+    pub fn is_pressed(&self) -> bool
+    {
+        matches!(self, Self::Pressed)
+    }
+
+    #[must_use]
+    #[inline]
+    pub fn is_released(&self) -> bool
+    {
+        matches!(self, Self::Released)
+    }
+}
+
+impl From<winit::event::ElementState> for ButtonState
+{
+    fn from(element_state: winit::event::ElementState) -> Self
+    {
+        match element_state {
+            winit::event::ElementState::Pressed => Self::Pressed,
+            winit::event::ElementState::Released => Self::Released,
+        }
+    }
+}
+
+#[derive(Debug)]
+struct ButtonData
+{
+    current_state: ButtonState,
+    previous_state: ButtonState,
+}
+
+impl Default for ButtonData
+{
+    fn default() -> Self
+    {
+        Self {
+            current_state: ButtonState::Released,
+            previous_state: ButtonState::Released,
+        }
+    }
+}