Fix crash and clean up frontend -> backend input handling code (#1770)

editor/src/messages/input_mapper/utility_types/input_mouse.rs

@@ -3,7 +3,6 @@ use crate::messages::prelude::*;
 
 use bitflags::bitflags;
 use glam::DVec2;
-
 use std::collections::VecDeque;
 
 // Origin is top left
@@ -37,16 +36,35 @@ impl ViewportBounds {
 	}
 }
 
-#[derive(Debug, Copy, Clone, Default, Eq, PartialEq, Hash, serde::Serialize, serde::Deserialize)]
+use std::hash::{Hash, Hasher};
+
+#[derive(Debug, Copy, Clone, Default, serde::Serialize, serde::Deserialize)]
 pub struct ScrollDelta {
-	// TODO: Switch these to `f64` values (not trivial because floats don't provide PartialEq, Eq, and Hash)
-	pub x: i32,
-	pub y: i32,
-	pub z: i32,
+	pub x: f64,
+	pub y: f64,
+	pub z: f64,
+}
+
+impl PartialEq for ScrollDelta {
+	fn eq(&self, other: &Self) -> bool {
+		self.x == other.x && self.y == other.y && self.z == other.z
+	}
+}
+
+impl Eq for ScrollDelta {}
+
+impl Hash for ScrollDelta {
+	fn hash<H: Hasher>(&self, state: &mut H) {
+		let no_negative_zero = |value: f64| if value == 0. { 0. } else { value };
+
+		no_negative_zero(self.x).to_bits().hash(state);
+		no_negative_zero(self.y).to_bits().hash(state);
+		no_negative_zero(self.z).to_bits().hash(state);
+	}
 }
 
 impl ScrollDelta {
-	pub fn new(x: i32, y: i32, z: i32) -> Self {
+	pub fn new(x: f64, y: f64, z: f64) -> Self {
 		Self { x, y, z }
 	}
 
@@ -56,10 +74,11 @@ impl ScrollDelta {
 
 	pub fn scroll_delta(&self) -> f64 {
 		let (dx, dy) = (self.x, self.y);
-		dy.signum() as f64 * ((dy * dy + i32::min(dy.abs(), dx.abs()).pow(2)) as f64).sqrt()
+		dy.signum() as f64 * ((dy * dy + f64::min(dy.abs(), dx.abs()).powi(2)) as f64).sqrt()
 	}
 }
 
+// TODO: Document the difference between this and EditorMouseState
 #[derive(Debug, Copy, Clone, Default, PartialEq, serde::Serialize, serde::Deserialize)]
 pub struct MouseState {
 	pub position: ViewportPosition,
@@ -68,28 +87,6 @@ pub struct MouseState {
 }
 
 impl MouseState {
-	pub fn new() -> Self {
-		Self::default()
-	}
-
-	pub fn from_position(x: f64, y: f64) -> Self {
-		Self {
-			position: (x, y).into(),
-			mouse_keys: MouseKeys::default(),
-			scroll_delta: ScrollDelta::default(),
-		}
-	}
-
-	pub fn from_keys_and_editor_position(keys: u8, position: ViewportPosition) -> Self {
-		let mouse_keys = MouseKeys::from_bits(keys).expect("Invalid modifier keys");
-
-		Self {
-			position,
-			mouse_keys,
-			scroll_delta: ScrollDelta::default(),
-		}
-	}
-
 	pub fn finish_transaction(&self, drag_start: DVec2, responses: &mut VecDeque<Message>) {
 		match drag_start.distance(self.position) <= DRAG_THRESHOLD {
 			true => responses.add(DocumentMessage::AbortTransaction),
@@ -98,6 +95,7 @@ impl MouseState {
 	}
 }
 
+// TODO: Document the difference between this and MouseState
 #[derive(Debug, Copy, Clone, Default, PartialEq, serde::Serialize, serde::Deserialize)]
 pub struct EditorMouseState {
 	pub editor_position: EditorPosition,
@@ -106,20 +104,8 @@ pub struct EditorMouseState {
 }
 
 impl EditorMouseState {
-	pub fn new() -> Self {
-		Self::default()
-	}
-
-	pub fn from_editor_position(x: f64, y: f64) -> Self {
-		Self {
-			editor_position: (x, y).into(),
-			mouse_keys: MouseKeys::default(),
-			scroll_delta: ScrollDelta::default(),
-		}
-	}
-
 	pub fn from_keys_and_editor_position(keys: u8, editor_position: EditorPosition) -> Self {
-		let mouse_keys = MouseKeys::from_bits(keys).expect("Invalid modifier keys");
+		let mouse_keys = MouseKeys::from_bits(keys).expect("Invalid decoding of MouseKeys");
 
 		Self {
 			editor_position,
@@ -138,12 +124,16 @@ impl EditorMouseState {
 }
 
 bitflags! {
+	/// Based on <https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons#value>.
 	#[derive(Default, Clone, Copy, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
 	#[repr(transparent)]
 	pub struct MouseKeys: u8 {
-		const LEFT   = 0b0000_0001;
-		const RIGHT  = 0b0000_0010;
-		const MIDDLE = 0b0000_0100;
+		const NONE    = 0b0000_0000;
+		const LEFT    = 0b0000_0001;
+		const RIGHT   = 0b0000_0010;
+		const MIDDLE  = 0b0000_0100;
+		const BACK    = 0b0000_1000;
+		const FORWARD = 0b0001_0000;
 	}
 }
 

editor/src/messages/input_preprocessor/input_preprocessor_message_handler.rs

@@ -181,7 +181,7 @@ impl InputPreprocessorMessageHandler {
 #[cfg(test)]
 mod test {
 	use crate::messages::input_mapper::utility_types::input_keyboard::{Key, ModifierKeys};
-	use crate::messages::input_mapper::utility_types::input_mouse::EditorMouseState;
+	use crate::messages::input_mapper::utility_types::input_mouse::{EditorMouseState, MouseKeys, ScrollDelta};
 	use crate::messages::portfolio::utility_types::KeyboardPlatformLayout;
 	use crate::messages::prelude::*;
 
@@ -189,7 +189,11 @@ mod test {
 	fn process_action_mouse_move_handle_modifier_keys() {
 		let mut input_preprocessor = InputPreprocessorMessageHandler::default();
 
-		let editor_mouse_state = EditorMouseState::from_editor_position(4., 809.);
+		let editor_mouse_state = EditorMouseState {
+			editor_position: (4., 809.).into(),
+			mouse_keys: MouseKeys::default(),
+			scroll_delta: ScrollDelta::default(),
+		};
 		let modifier_keys = ModifierKeys::ALT;
 		let message = InputPreprocessorMessage::PointerMove { editor_mouse_state, modifier_keys };
 
@@ -208,7 +212,7 @@ mod test {
 	fn process_action_mouse_down_handle_modifier_keys() {
 		let mut input_preprocessor = InputPreprocessorMessageHandler::default();
 
-		let editor_mouse_state = EditorMouseState::new();
+		let editor_mouse_state = EditorMouseState::default();
 		let modifier_keys = ModifierKeys::CONTROL;
 		let message = InputPreprocessorMessage::PointerDown { editor_mouse_state, modifier_keys };
 
@@ -227,7 +231,7 @@ mod test {
 	fn process_action_mouse_up_handle_modifier_keys() {
 		let mut input_preprocessor = InputPreprocessorMessageHandler::default();
 
-		let editor_mouse_state = EditorMouseState::new();
+		let editor_mouse_state = EditorMouseState::default();
 		let modifier_keys = ModifierKeys::SHIFT;
 		let message = InputPreprocessorMessage::PointerUp { editor_mouse_state, modifier_keys };
 

editor/src/messages/portfolio/document/navigation/navigation_message_handler.rs

@@ -145,7 +145,7 @@ impl MessageHandler<NavigationMessage, NavigationMessageData<'_>> for Navigation
 			NavigationMessage::CanvasZoomMouseWheel => {
 				let scroll = ipp.mouse.scroll_delta.scroll_delta();
 				let mut zoom_factor = 1. + scroll.abs() * VIEWPORT_ZOOM_WHEEL_RATE;
-				if ipp.mouse.scroll_delta.y > 0 {
+				if ipp.mouse.scroll_delta.y > 0. {
 					zoom_factor = 1. / zoom_factor
 				}
 				zoom_factor *= Self::clamp_zoom(ptz.zoom * zoom_factor, document_bounds, old_zoom, ipp);

editor/src/test_utils.rs

@@ -73,7 +73,7 @@ impl EditorTestUtils for Editor {
 	}
 
 	fn move_mouse(&mut self, x: f64, y: f64) {
-		let mut editor_mouse_state = EditorMouseState::new();
+		let mut editor_mouse_state = EditorMouseState::default();
 		editor_mouse_state.editor_position = ViewportPosition::new(x, y);
 		let modifier_keys = ModifierKeys::default();
 		self.input(InputPreprocessorMessage::PointerMove { editor_mouse_state, modifier_keys });

frontend/wasm/src/editor_api.rs

@@ -355,7 +355,7 @@ impl EditorHandle {
 
 	/// Mouse scrolling within the screenspace bounds of the viewport
 	#[wasm_bindgen(js_name = onWheelScroll)]
-	pub fn on_wheel_scroll(&self, x: f64, y: f64, mouse_keys: u8, wheel_delta_x: i32, wheel_delta_y: i32, wheel_delta_z: i32, modifiers: u8) {
+	pub fn on_wheel_scroll(&self, x: f64, y: f64, mouse_keys: u8, wheel_delta_x: f64, wheel_delta_y: f64, wheel_delta_z: f64, modifiers: u8) {
 		let mut editor_mouse_state = EditorMouseState::from_keys_and_editor_position(mouse_keys, (x, y).into());
 		editor_mouse_state.scroll_delta = ScrollDelta::new(wheel_delta_x, wheel_delta_y, wheel_delta_z);