Added dynatos_util::ElementEventListener.

dynatos-util/src/event_listener.rs

@@ -0,0 +1,77 @@
+//! Event listener
+
+// Imports
+use wasm_bindgen::{
+	closure::{Closure, IntoWasmClosure, WasmClosure},
+	JsCast,
+};
+
+/// Extension trait to define an event listener on an element with a closure
+#[extend::ext_sized(name = ElementEventListener)]
+pub impl web_sys::Element {
+	fn add_event_listener<E, F>(&self, f: F)
+	where
+		E: EventListener,
+		F: IntoWasmClosure<E::Closure> + 'static,
+	{
+		// Build the closure
+		let closure = Closure::<E::Closure>::new(f)
+			.into_js_value()
+			.dyn_into::<web_sys::js_sys::Function>()
+			.expect("Should be a valid function");
+
+		// Then add it
+		// TODO: Can this fail? On MDN, nothing seems to mention it can throw.
+		self.add_event_listener_with_callback(E::name(), &closure)
+			.expect("Unable to add event listener");
+	}
+
+	fn with_event_listener<E, F>(self, f: F) -> Self
+	where
+		E: EventListener,
+		F: IntoWasmClosure<E::Closure> + 'static,
+	{
+		self.add_event_listener::<E, F>(f);
+		self
+	}
+}
+
+/// Event listener
+pub trait EventListener {
+	/// Closure type
+	type Closure: ?Sized + WasmClosure;
+
+	/// Returns the event name
+	fn name() -> &'static str;
+}
+
+/// Events
+pub mod ev {
+	// Imports
+	use {super::EventListener, web_sys::PointerEvent};
+
+	macro define_events(
+		$(
+			$( #[ doc = $ev_doc:literal ] )*
+			$Event:ident($ArgTy:ty) = $name:literal;
+		)*
+	) {
+		$(
+			$( #[ doc = $ev_doc ] )*
+			pub struct $Event;
+
+			impl EventListener for $Event {
+				type Closure = dyn Fn($ArgTy);
+
+				fn name() -> &'static str {
+					$name
+				}
+			}
+		)*
+	}
+
+	define_events! {
+		/// `click` Event
+		Click(PointerEvent) = "click";
+	}
+}

dynatos-util/src/lib.rs

@@ -1,5 +1,14 @@
 //! Utilities for [`dynatos`]
 
+// Features
+#![feature(decl_macro)]
+
+// Modules
+mod event_listener;
+
+// Exports
+pub use event_listener::{ev, ElementEventListener, EventListener};
+
 // Imports
 use {
 	std::fmt,