Implement event/response roundtrip (#49)

client/web/src/components/panels/ViewportPanel.vue

@@ -12,7 +12,7 @@
 		</LayoutRow>
 		<LayoutRow :class="'tools-and-viewport'">
 			<LayoutCol :class="'tools'"></LayoutCol>
-			<LayoutCol :class="'viewport-container'"></LayoutCol>
+			<LayoutCol :class="'viewport-container'" @click="canvasClick"></LayoutCol>
 		</LayoutRow>
 	</LayoutCol>
 </template>
@@ -70,12 +70,19 @@ import { defineComponent } from "vue";
 import LayoutRow from "../layout/LayoutRow.vue";
 import LayoutCol from "../layout/LayoutCol.vue";
 
+const wasm = import("../../../wasm/pkg");
+
 export default defineComponent({
 	components: {
 		LayoutRow,
 		LayoutCol,
 	},
-	props: {
+	methods: {
+        async canvasClick(e: MouseEvent) {
+            console.log(e);
+            const { on_mouse_click } = await wasm;
+            on_mouse_click(e.offsetX, e.offsetY);
+        }
 	},
 });
 </script>

client/web/src/wasm-callback-processor.js

@@ -0,0 +1,3 @@
+export function update_canvas() {
+    console.log("update_canvas")
+}

client/web/wasm/src/lib.rs

@@ -4,23 +4,27 @@ pub mod viewport;
 pub mod window;
 pub mod wrappers;
 
-use graphite_editor_core::Editor;
+use graphite_editor_core::{events::Response, Callback, Editor};
 use std::cell::RefCell;
 use wasm_bindgen::prelude::*;
 
 // the thread_local macro provides a way to initialize static variables with non-constant functions
-thread_local! {pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new())}
+thread_local! {pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new(Box::new(handle_response)))}
 
 #[wasm_bindgen(start)]
 pub fn init() {
 	utils::set_panic_hook();
 }
 
-/// Send events
-#[wasm_bindgen]
-pub fn handle_event(event_name: String) {
-	// TODO: add payload
-	todo!()
+fn handle_response(response: Response) {
+	match response {
+		Response::UpdateCanvas => update_canvas(),
+	}
+}
+
+#[wasm_bindgen(module = "/../src/wasm-callback-processor.js")]
+extern "C" {
+	fn update_canvas();
 }
 
 #[wasm_bindgen]

client/web/wasm/src/viewport.rs

@@ -1,6 +1,7 @@
 use crate::shims::Error;
 use crate::wrappers::{translate_tool, Color};
 use crate::EDITOR_STATE;
+use graphite_editor_core::events;
 use wasm_bindgen::prelude::*;
 
 /// Modify the currently selected tool in the document state store
@@ -15,10 +16,22 @@ pub fn select_tool(tool: String) -> Result<(), JsValue> {
 	})
 }
 
+static mut POS: (u32, u32) = (0, 0);
+
 /// Mouse movement with the bounds of the canvas
 #[wasm_bindgen]
 pub fn on_mouse_move(x: u32, y: u32) {
-	todo!()
+	// SAFETY: This is safe because the code can only ever run in a single thread
+	unsafe {
+		POS = (x, y);
+	}
+}
+
+/// Mouse click within the bounds of the canvas
+#[wasm_bindgen]
+pub fn on_mouse_click(x: u32, y: u32) -> Result<(), JsValue> {
+	let ev = events::Event::Click(events::MouseState::from_pos(x, y));
+	EDITOR_STATE.with(|editor| editor.borrow_mut().handle_event(ev)).map_err(|err| Error::new(&err.to_string()).into())
 }
 
 /// Update working colors

core/editor/src/dispatcher/events.rs

@@ -11,25 +11,45 @@ pub enum Event {
 }
 
 #[derive(Debug, Clone)]
-struct Trace(Vec<MouseState>);
-#[derive(Debug, Clone)]
-struct MouseState {
-	x: u32,
-	y: u32,
-	mod_keys: ModKeys,
-	mouse_keys: MouseKeys,
+#[repr(C)]
+pub enum Response {
+	UpdateCanvas,
 }
 
 #[derive(Debug, Clone)]
-enum Key {
+pub struct Trace(Vec<MouseState>);
+#[derive(Debug, Clone, Default)]
+pub struct MouseState {
+	x: u32,
+	y: u32,
+	mod_keys: ModKeysStorage,
+	mouse_keys: MouseKeysStorage,
+}
+
+impl MouseState {
+	pub const fn new() -> MouseState {
+		MouseState {
+			x: 0,
+			y: 0,
+			mod_keys: 0,
+			mouse_keys: 0,
+		}
+	}
+	pub const fn from_pos(x: u32, y: u32) -> MouseState {
+		MouseState { x, y, mod_keys: 0, mouse_keys: 0 }
+	}
+}
+
+#[derive(Debug, Clone)]
+pub enum Key {
 	None,
 }
 
-type ModKeysStorage = u8;
-type MouseKeysStorage = u8;
+pub type ModKeysStorage = u8;
+pub type MouseKeysStorage = u8;
 #[derive(Debug, Clone, Copy)]
 #[repr(transparent)]
-struct ModKeys(ModKeysStorage);
+pub struct ModKeys(ModKeysStorage);
 
 impl ModKeys {
 	pub fn get_key(&self, key: ModKey) -> bool {
@@ -55,7 +75,7 @@ impl MouseKeys {
 
 #[repr(u8)]
 #[derive(Debug, Clone)]
-enum ModKey {
+pub enum ModKey {
 	Control = 1,
 	Shift = 2,
 	Alt = 4,
@@ -63,7 +83,7 @@ enum ModKey {
 
 #[repr(u8)]
 #[derive(Debug, Clone)]
-enum MouseKey {
+pub enum MouseKey {
 	LeftMouse = 1,
 	RightMouse = 2,
 	MiddleMouse = 4,

core/editor/src/dispatcher/mod.rs

@@ -0,0 +1,24 @@
+pub mod events;
+use crate::EditorError;
+use events::{Event, Response};
+
+pub type Callback = Box<dyn Fn(Response)>;
+pub struct Dispatcher {
+	callback: Callback,
+}
+
+impl Dispatcher {
+	pub fn handle_event(&self, event: Event) -> Result<(), EditorError> {
+		match event {
+			Event::Click(_) => Ok(self.emit_response(Response::UpdateCanvas)),
+			_ => todo!(),
+		}
+	}
+	pub fn emit_response(&self, response: Response) {
+		let func = &self.callback;
+		func(response)
+	}
+	pub fn new(callback: Callback) -> Dispatcher {
+		Dispatcher { callback }
+	}
+}

core/editor/src/error.rs

@@ -1,3 +1,4 @@
+use crate::events::Event;
 use crate::Color;
 use std::error::Error;
 use std::fmt::{self, Display};
@@ -6,6 +7,7 @@ use std::fmt::{self, Display};
 #[derive(Clone, Debug)]
 pub enum EditorError {
 	InvalidOperation(String),
+	InvalidEvent(String),
 	Misc(String),
 	Color(String),
 }
@@ -14,6 +16,7 @@ impl Display for EditorError {
 	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 		match self {
 			EditorError::InvalidOperation(e) => write!(f, "Failed to execute operation: {}", e),
+			EditorError::InvalidEvent(e) => write!(f, "Failed to dispatch event: {}", e),
 			EditorError::Misc(e) => write!(f, "{}", e),
 			EditorError::Color(c) => write!(f, "Tried to construct an invalid color {:?}", c),
 		}
@@ -35,3 +38,4 @@ macro_rules! derive_from {
 derive_from!(&str, Misc);
 derive_from!(String, Misc);
 derive_from!(Color, Color);
+derive_from!(Event, InvalidEvent);

core/editor/src/lib.rs

@@ -1,6 +1,6 @@
 mod color;
+mod dispatcher;
 mod error;
-mod scheduler;
 pub mod tools;
 pub mod workspace;
 
@@ -10,6 +10,13 @@ pub use error::EditorError;
 #[doc(inline)]
 pub use color::Color;
 
+#[doc(inline)]
+pub use dispatcher::events;
+
+#[doc(inline)]
+pub use dispatcher::Callback;
+
+use dispatcher::Dispatcher;
 use tools::ToolState;
 use workspace::Workspace;
 
@@ -17,13 +24,18 @@ use workspace::Workspace;
 pub struct Editor {
 	pub tools: ToolState,
 	workspace: Workspace,
+	dispatcher: Dispatcher,
 }
 
 impl Editor {
-	pub fn new() -> Self {
+	pub fn new(callback: Callback) -> Self {
 		Self {
 			tools: ToolState::new(),
 			workspace: Workspace::new(),
+			dispatcher: Dispatcher::new(callback),
 		}
 	}
+	pub fn handle_event(&mut self, event: events::Event) -> Result<(), EditorError> {
+		self.dispatcher.handle_event(event)
+	}
 }

core/editor/src/scheduler/mod.rs

@@ -1 +0,0 @@
-pub mod events;