feat: allow multiple class names in view! macro class = (closes #612) (#614)

leptos_dom/src/html.rs

@@ -576,6 +576,17 @@ impl<El: ElementDescriptor + 'static> HtmlElement<El> {
         }
     }
 
+    /// Adds a list of classes separated by ASCII whitespace to an element.
+    #[track_caller]
+    pub fn classes(self, classes: impl Into<Cow<'static, str>>) -> Self {
+        let classes = classes.into();
+        let mut this = self;
+        for class in classes.split_ascii_whitespace() {
+            this = this.class(class.to_string(), true);
+        }
+        this
+    }
+
     /// Sets a property on an element.
     #[track_caller]
     pub fn prop(

leptos_dom/src/macro_helpers/into_class.rs

@@ -107,10 +107,15 @@ pub(crate) fn class_expression(
 
     if force || !HydrationCtx::is_hydrating() {
         let class_name = wasm_bindgen::intern(class_name);
+
         if value {
-            class_list.add_1(class_name).unwrap_throw();
+            if let Err(e) = class_list.add_1(class_name) {
+                crate::error!("[HtmlElement::class()] {e:?}");
+            }
         } else {
-            class_list.remove_1(class_name).unwrap_throw();
+            if let Err(e) = class_list.remove_1(class_name) {
+                crate::error!("[HtmlElement::class()] {e:?}");
+            }
         }
     }
 }

leptos_macro/src/view.rs

@@ -748,7 +748,10 @@ fn element_to_tokens(
             None => quote! {},
             Some(class) => {
                 quote! {
-                    .class(#class, true)
+                    .classes(
+                        #[allow(unused_braces)]
+                        #class
+                    )
                 }
             }
         };