Node: Add setHandler features on signals

api/sixtyfps-node/README.md

@@ -70,11 +70,12 @@ console.log(component.counter);
 
 ### Signals
 
-The signals are also exposed as property that can be called
+The signals are also exposed as property that have a setHandler function, and that can can be called.
+
 
 ```js
 // connect to a signal
-component.clicked = function() { console.log("hello"); }
+component.clicked.setHandler(function() { console.log("hello"); })
 // emit a signal
 component.clicked();
 ```

api/sixtyfps-node/lib/index.ts

@@ -49,6 +49,14 @@ class Component {
     }
 }
 
+/**
+ * @hidden
+ */
+interface Signal {
+    (): any;
+    setHandler(cb: any): void;
+}
+
 require.extensions['.60'] =
     function (module, filename) {
         var c = native.load(filename);
@@ -64,7 +72,11 @@ require.extensions['.60'] =
             });
             c.signals().forEach((x: string) => {
                 Object.defineProperty(ret, x, {
-                    get() { return function () { comp.emit_signal(x, [...arguments]); } },
+                    get() {
+                        let signal = function () { comp.emit_signal(x, [...arguments]); } as Signal;
+                        signal.setHandler = function (callback) { comp.connect_signal(x, callback) };
+                        return signal;
+                    },
                     enumerable: true,
                 })
             });

api/sixtyfps-node/native/lib.rs

@@ -83,6 +83,28 @@ fn load(mut cx: FunctionContext) -> JsResult<JsValue> {
     Ok(obj.as_value(&mut cx))
 }
 
+fn make_signal_handler<'cx>(
+    cx: &mut impl Context<'cx>,
+    persistent_context: &persistent_context::PersistentContext<'cx>,
+    fun: Handle<'cx, JsFunction>,
+) -> Box<dyn Fn(&[sixtyfps_interpreter::Value])> {
+    let fun_value = fun.as_value(cx);
+    let fun_idx = persistent_context.allocate(cx, fun_value);
+    Box::new(move |args| {
+        let args = args.iter().cloned().collect::<Vec<_>>();
+        run_with_global_contect(&move |cx, persistent_context| {
+            let args = args.iter().map(|a| to_js_value(a.clone(), cx).unwrap()).collect::<Vec<_>>();
+            persistent_context
+                .get(cx, fun_idx)
+                .unwrap()
+                .downcast::<JsFunction>()
+                .unwrap()
+                .call::<_, _, JsValue, _>(cx, JsUndefined::new(), args)
+                .unwrap();
+        })
+    })
+}
+
 fn create<'cx>(
     cx: &mut CallContext<'cx, impl neon::object::This>,
     component_type: Rc<sixtyfps_interpreter::ComponentDescription>,
@@ -103,28 +125,12 @@ fn create<'cx>(
                 })?
                 .clone();
             if let Type::Signal { .. } = ty {
-                let _fun = value.downcast_or_throw::<JsFunction, _>(cx)?;
-                let fun_idx = persistent_context.allocate(cx, value);
+                let fun = value.downcast_or_throw::<JsFunction, _>(cx)?;
                 component_type
                     .set_signal_handler(
                         component.borrow(),
                         prop_name.as_str(),
-                        Box::new(move |args| {
-                            let args = args.iter().cloned().collect::<Vec<_>>();
-                            run_with_global_contect(&move |cx, persistent_context| {
-                                let args = args
-                                    .iter()
-                                    .map(|a| to_js_value(a.clone(), cx).unwrap())
-                                    .collect::<Vec<_>>();
-                                persistent_context
-                                    .get(cx, fun_idx)
-                                    .unwrap()
-                                    .downcast::<JsFunction>()
-                                    .unwrap()
-                                    .call::<_, _, JsValue, _>(cx, JsUndefined::new(), args)
-                                    .unwrap();
-                            })
-                        }),
+                        make_signal_handler(cx, &persistent_context, fun),
                     )
                     .or_else(|_| cx.throw_error(format!("Cannot set signal")))?;
             } else {
@@ -412,6 +418,23 @@ declare_types! {
             Ok(JsUndefined::new().as_value(&mut cx))
         }
 
+         method connect_signal(mut cx) {
+            let signal_name = cx.argument::<JsString>(0)?.value();
+            let handler = cx.argument::<JsFunction>(1)?;
+            let this = cx.this();
+            let persistent_context =
+                persistent_context::PersistentContext::from_object(&mut cx, this.downcast().unwrap())?;
+            let lock = cx.lock();
+            let x = this.borrow(&lock).0.clone();
+            let component = x.ok_or(()).or_else(|()| cx.throw_error("Invalid type"))?;
+            component.description().set_signal_handler(
+                component.borrow(),
+                signal_name.as_str(),
+                make_signal_handler(&mut cx, &persistent_context, handler)
+            ).or_else(|_| cx.throw_error(format!("Cannot set signal")))?;
+            Ok(JsUndefined::new().as_value(&mut cx))
+        }
+
         method send_mouse_click(mut cx) {
             let x = cx.argument::<JsNumber>(0)?.value() as f32;
             let y = cx.argument::<JsNumber>(1)?.value() as f32;

tests/cases/signals/handler_with_arg.60

@@ -88,7 +88,21 @@ try {
     assert.equal(e.toString(), "Error: test_signal expect 1 arguments, but 0 where provided");
 }
 assert.equal(instance.signal_emission_count, 0);
+
+
+/// also test setHandler
+instance.test_signal2.setHandler(function(a) {
+    signal_3_emited += 100;
+    signal_3_string_value = a;
+});
+instance.test_signal2("salùt")
+assert.equal(signal_3_emited, 101);
+assert.equal(signal_3_string_value, "salùt");
+assert.equal(signal_3_int_value, 55); // same as before
+
 ```
 
+
+
 */