Allow mutable forms of the API

macros/src/lib.rs

@@ -104,6 +104,7 @@ fn expand_component_def(
     }
 }
 
+// TODO(jwall): Stateful elements?
 fn expand_wc_struct_trait_shim(
     struct_name: &Ident,
     once_name: &Ident,
@@ -224,45 +225,51 @@ fn expand_wasm_shim(struct_name: &Ident) -> syn::ItemImpl {
             }
 
             #[::wasm_bindgen::prelude::wasm_bindgen]
-            pub fn init_impl(&self, element: &web_sys::HtmlElement) {
+            pub fn init_impl(&mut self, element: &web_sys::HtmlElement) {
                 use #trait_path;
                 self.init(element);
+                self.init_mut(element);
             }
 
             #[::wasm_bindgen::prelude::wasm_bindgen]
-            pub fn connected_impl(&self, element: &web_sys::HtmlElement) {
+            pub fn connected_impl(&mut self, element: &web_sys::HtmlElement) {
                 use #trait_path;
                 self.connected(element);
+                self.connected_mut(element);
             }
 
             #[::wasm_bindgen::prelude::wasm_bindgen]
-            pub fn disconnected_impl(&self, element: &web_sys::HtmlElement) {
+            pub fn disconnected_impl(&mut self, element: &web_sys::HtmlElement) {
                 use #trait_path;
                 self.disconnected(element);
+                self.disconnected_mut(element);
             }
 
             #[::wasm_bindgen::prelude::wasm_bindgen]
-            pub fn adopted_impl(&self, element: &web_sys::HtmlElement) {
+            pub fn adopted_impl(&mut self, element: &web_sys::HtmlElement) {
                 use #trait_path;
                 self.adopted(element);
+                self.adopted_mut(element);
             }
 
 
             #[::wasm_bindgen::prelude::wasm_bindgen]
             pub fn attribute_changed_impl(
-                &self,
+                &mut self,
                 element: &web_sys::HtmlElement,
                 name: ::wasm_bindgen::JsValue,
                 old_value: ::wasm_bindgen::JsValue,
                 new_value: ::wasm_bindgen::JsValue,
             ) {
                 use #trait_path;
-                self.attribute_changed(element, name, old_value, new_value);
+                self.attribute_changed(element, name.clone(), old_value.clone(), new_value.clone());
+                self.attribute_changed_mut(element, name, old_value, new_value);
             }
 
-            pub fn handle_component_event_impl(&self, element: &web_sys::HtmlElement, event: &web_sys::Event) {
+            pub fn handle_component_event_impl(&mut self, element: &web_sys::HtmlElement, event: &web_sys::Event) {
                 use #trait_path;
                 self.handle_event(element, event);
+                self.handle_event_mut(element, event);
             }
         }
     }

wasm-web-component/src/lib.rs

@@ -159,6 +159,10 @@ pub trait WebComponentBinding: WebComponentDef {
         // noop
     }
     
+    fn init_mut(&mut self, _element: &HtmlElement) {
+        // noop
+    }
+    
     /// Called when the web component is connected to the DOM.
     /// This is when you should do any setup like attaching a ShadowDom
     /// or appending elements.
@@ -166,16 +170,33 @@ pub trait WebComponentBinding: WebComponentDef {
         // noop
     }
 
+    /// Called when the web component is connected to the DOM.
+    /// This is when you should do any setup like attaching a ShadowDom
+    /// or appending elements.
+    fn connected_mut(&mut self, _element: &HtmlElement) {
+        // noop
+    }
+
     /// Called when the web component is disconnected from the DOM.
     fn disconnected(&self, _element: &HtmlElement) {
         // noop
     }
 
+    /// Called when the web component is disconnected from the DOM.
+    fn disconnected_mut(&mut self, _element: &HtmlElement) {
+        // noop
+    }
+
     /// Called When the web component is moved to a new document.
     fn adopted(&self, _element: &HtmlElement) {
         // noop
     }
 
+    /// Called When the web component is moved to a new document.
+    fn adopted_mut(&mut self, _element: &HtmlElement) {
+        // noop
+    }
+
     /// Called when one of the observed attributes has changed.
     /// the observedc attributes are listed in the observed_attrs argument to the
     /// `#[web_component(observed_attrs = "['attr1', 'attr2']")` attribute.
@@ -189,10 +210,28 @@ pub trait WebComponentBinding: WebComponentDef {
         // noop
     }
 
+    /// Called when one of the observed attributes has changed.
+    /// the observedc attributes are listed in the observed_attrs argument to the
+    /// `#[web_component(observed_attrs = "['attr1', 'attr2']")` attribute.
+    fn attribute_changed_mut(
+        &mut self,
+        _element: &HtmlElement,
+        _name: JsValue,
+        _old_value: JsValue,
+        _new_value: JsValue,
+    ) {
+        // noop
+    }
+
     /// Top level event handler for this custom element.
     fn handle_event(&self, _element: &HtmlElement, _event: &Event) {
         // noop
     }
+    
+    /// Top level event handler for this custom element.
+    fn handle_event_mut(&mut self, _element: &HtmlElement, _event: &Event) {
+        // noop
+    }
 }
 
 /// Marker trait used in the generated shims to assert that there are Rust implemtntations