Commit cf38348
Create JS callback function for kaja-web framework. Rust.
Changed files (4)
Diff
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índex: usize,+/// }++/// #[callback("someClickCallback")]+/// fn some_on_click_function(event: SomeClickEvent) {+/// log!("event.índex: {:?}", event.índex);+/// }+///+/// // This example allows you to call the Rust function from JavaScript like this:+/// let html = kaja_html_macro::html! {{+/// <button onclick="someClickCallback({+/// index: 1+/// })">Run WASM Callback</button>+/// }};+/// ```+#[proc_macro_attribute]+pub fn callback(attr: TokenStream, item: TokenStream) -> TokenStream {+ let js_name = parse_macro_input!(attr as LitStr).value();+ let input_fn = parse_macro_input!(item as ItemFn);++ let fn_name = &input_fn.sig.ident;+ let vis = &input_fn.vis;+ let sig = &input_fn.sig;+ let fn_block = &input_fn.block;++ // Extract single argument type+ let arg = input_fn+ .sig+ .inputs+ .first()+ .expect("callback must have one argument");++ let arg_type = match arg {+ FnArg::Typed(pat_type) => &pat_type.ty,+ _ => panic!("expected typed argument"),+ };++ let register_fn_name = syn::Ident::new(&format!("{}_register", fn_name), fn_name.span());++ let expanded = quote! {+ #vis #sig #fn_block++ pub fn #register_fn_name() {+ use wasm_bindgen::closure::Closure;+ use wasm_bindgen::JsCast;++ let window = web_sys::window();++ if window.is_none() {+ gloo::console::log!("Callback error: {}. No window.", fn_name);+ return;+ }++ let window = window.unwrap();+ let callback_js_closure = Closure::<dyn FnMut(wasm_bindgen::JsValue)>::new(|val| {+ let event: #arg_type =+ serde_wasm_bindgen::from_value(val);++ if event.is_err() {+ gloo::console::log!("Callback error: {}. Wrong argument type: {}", fn_name, event.err().unwrap());+ return;+ }++ let event = event.unwrap();+ #fn_name(event);+ });++ let set = ::js_sys::Reflect::set(+ &window,+ &#js_name.into(),+ cb.as_ref().unchecked_ref(),+ );++ if set.is_err() {+ let err = set.err().unwrap();++ gloo::console::log!(r#"Callback init error: {}, failed to set property on window.+ Needed in order to have callback available in JS land."#, err);++ return;+ }++ cb.forget();+ }++ inventory::submit! {+ CallbackRegistration {+ register: #register_fn_name+ }+ }+ };++ TokenStream::from(expanded)+}