mousewheel

src/input.rs

@@ -1,4 +1,4 @@
-use winit::{ScanCode, ModifiersState, MouseButton, ElementState};
+use winit::{ScanCode, ModifiersState, MouseButton, ElementState, MouseScrollDelta};
 
 use std::collections::{HashMap, HashSet};
 use std::fs;
@@ -74,13 +74,15 @@ impl InputState {
             let input = if let Some(scan_code) = bn.scan_code {
                 DigitalInput::Keyboard(KeyboardInput { scan_code, modifiers })
             } else if let Some(button_name) = &bn.mouse {
-                let button = match button_name.to_lowercase().as_str() {
-                    "left" => MouseButton::Left,
-                    "middle" => MouseButton::Middle,
-                    "right" => MouseButton::Right,
-                    other => MouseButton::Other(other.parse().expect(&format!("Unknown button: {:?}", other)))
-                };
-                DigitalInput::Mouse(MouseInput { button, modifiers })
+                let button_name_lower = button_name.to_lowercase();
+                match button_name_lower.as_str() {
+                    "left" => DigitalInput::Mouse(MouseInput { button: MouseButton::Left, modifiers }),
+                    "middle" => DigitalInput::Mouse(MouseInput { button: MouseButton::Middle, modifiers }),
+                    "right" => DigitalInput::Mouse(MouseInput { button: MouseButton::Right, modifiers }),
+                    "wheelup" => DigitalInput::Wheel(WheelInput { direction: WheelInputDirection::Up, modifiers }),
+                    "wheeldown" => DigitalInput::Wheel(WheelInput { direction: WheelInputDirection::Down, modifiers }),
+                    other => DigitalInput::Mouse(MouseInput { button: MouseButton::Other(other.parse().expect(&format!("Unknown button: {:?}", other))), modifiers }),
+                }
             } else {
                 panic!("No mouse or keyboard input for button {:?}", bn.name);
             };
@@ -184,6 +186,9 @@ impl InputState {
             DigitalInput::Mouse(mouse_input) => {
                 self.pressed_mouse_buttons.contains(&mouse_input.button)
                     && self.modifiers_are_pressed(mouse_input.modifiers)
+            },
+            DigitalInput::Wheel(wheel_input) => {
+                self.input_events.contains(&DigitalInputEvent::Pressed(DigitalInput::Wheel(wheel_input.clone())))
             }
         }
     }
@@ -227,6 +232,16 @@ impl InputState {
         }
     }
 
+    pub fn on_mouse_wheel_event(self: &mut Self, delta: &MouseScrollDelta, modifiers: &ModifiersState) {
+        let direction = match delta {
+            MouseScrollDelta::LineDelta(_x, y)    => if *y       >= 0.0 { WheelInputDirection::Up } else { WheelInputDirection::Down },
+            MouseScrollDelta::PixelDelta(pixels) => if pixels.y >= 0.0 { WheelInputDirection::Up } else { WheelInputDirection::Down },
+        };
+        let input = DigitalInput::Wheel(WheelInput { direction, modifiers: modifiers.clone() });
+        self.input_events.insert(DigitalInputEvent::Pressed(input.clone()));
+        self.input_events.insert(DigitalInputEvent::Released(input));
+    }
+
     pub fn frame_end(self: &mut Self) {
         self.input_events.clear();
     }
@@ -249,6 +264,7 @@ pub enum AxisInput {
 #[derive(Debug, Eq, PartialEq, Hash, Clone)]
 pub enum DigitalInput {
     Keyboard(KeyboardInput),
+    Wheel(WheelInput),
     Mouse(MouseInput)
 }
 
@@ -264,6 +280,18 @@ pub struct MouseInput {
     modifiers: ModifiersState
 }
 
+#[derive(Debug, Eq, PartialEq, Hash, Clone)]
+pub struct WheelInput {
+    direction: WheelInputDirection,
+    modifiers: ModifiersState
+}
+
+#[derive(Debug, Eq, PartialEq, Hash, Clone)]
+pub enum WheelInputDirection {
+    Up,
+    Down
+}
+
 #[derive(Debug, Eq, PartialEq, Clone)]
 pub struct AnalogInput {