Require default for every widget prop.

examples/text_box.rs

@@ -38,8 +38,8 @@ fn TextBoxExample(context: &mut KayakContext) {
     rsx! {
         <>
             <Window position={(50.0, 50.0)} size={(300.0, 300.0)} title={"TextBox Example".to_string()}>
-                <TextBox styles={Some(input_styles)} value={current_value} on_change={Some(on_change)} placeholder={None as Option<String>} />
-                <TextBox styles={Some(input_styles)} value={current_value2} on_change={Some(on_change2)} placeholder={None as Option<String>} />
+                <TextBox styles={Some(input_styles)} value={current_value} on_change={Some(on_change)} />
+                <TextBox styles={Some(input_styles)} value={current_value2} on_change={Some(on_change2)} />
             </Window>
         </>
     }

examples/todo/todo.rs

@@ -79,11 +79,15 @@ fn TodoApp() {
         cloned_set_todos(todos_cloned.clone());
     });
 
-    let placeholder = Some("Type here to add a new todo!".to_string());
     rsx! {
         <Window position={(415.0, 50.0)} size={(450.0, 600.0)} title={"Todo!".to_string()}>
             <Element styles={Some(top_area_styles)}>
-                <TextBox styles={Some(text_box_styles)} value={new_todo_value} placeholder={placeholder} on_change={Some(on_change)} />
+                <TextBox
+                    styles={Some(text_box_styles)}
+                    value={new_todo_value}
+                    placeholder={Some("Type here to add a new todo!".to_string())}
+                    on_change={Some(on_change)}
+                />
                 <AddButton on_event={Some(add_events)} />
             </Element>
             <Cards cards={todos} on_delete={handle_delete} />

kayak_core/src/fragment.rs

@@ -3,13 +3,14 @@ use derivative::*;
 use crate::{context::KayakContext, styles::Style, Index, Widget};
 
 #[derive(Derivative)]
-#[derivative(Debug, PartialEq)]
+#[derivative(Default, Debug, PartialEq)]
 pub struct Fragment {
     pub id: Index,
+    #[derivative(Default(value = "None"))]
     pub styles: Option<Style>,
-    #[derivative(Debug = "ignore", PartialEq = "ignore")]
+    #[derivative(Default(value = "None"), Debug = "ignore", PartialEq = "ignore")]
     pub children: crate::Children,
-    #[derivative(Debug = "ignore", PartialEq = "ignore")]
+    #[derivative(Default(value = "None"), Debug = "ignore", PartialEq = "ignore")]
     pub on_event: Option<crate::OnEvent>,
 }
 

kayak_core/src/lib.rs

@@ -58,6 +58,12 @@ impl OnEvent {
 #[derive(Clone)]
 pub struct Handler<T>(pub Arc<RwLock<dyn FnMut(T) + Send + Sync + 'static>>);
 
+impl<T> Default for Handler<T> {
+    fn default() -> Self {
+        Self(Arc::new(RwLock::new(|_| {})))
+    }
+}
+
 impl<T> Handler<T> {
     pub fn new<F: FnMut(T) + Send + Sync + 'static>(f: F) -> Handler<T> {
         Handler(Arc::new(RwLock::new(f)))

kayak_render_macros/examples/main.rs

 use kayak_core::{context::KayakContext, styles::Style, Children, Index};
-use kayak_core::{derivative::*, Fragment, Widget};
+use kayak_core::{
+    derivative::{self, *},
+    Fragment, Widget,
+};
 use kayak_render_macros::rsx;
 
 #[derive(Derivative)]
-#[derivative(Debug, PartialEq)]
+#[derivative(Default, Debug, PartialEq)]
 #[allow(dead_code)]
 struct Test {
     id: Index,
+    #[derivative(Default(value = "None"))]
     styles: Option<Style>,
     foo: u32,
-    #[derivative(Debug = "ignore", PartialEq = "ignore")]
+    #[derivative(Debug = "ignore", PartialEq = "ignore", Default(value = "None"))]
     children: Children,
-    #[derivative(Debug = "ignore", PartialEq = "ignore")]
+    #[derivative(Debug = "ignore", PartialEq = "ignore", Default(value = "None"))]
     pub on_event: Option<kayak_core::OnEvent>,
 }
 

kayak_render_macros/src/function_component.rs

@@ -87,13 +87,14 @@ pub fn create_function_widget(f: syn::ItemFn, widget_arguments: WidgetArguments)
                 "styles : Option< kayak_ui :: core :: styles :: Style >",
             ],
             quote! {
+                #[derivative(Default(value="None"))]
                 pub styles: Option<#kayak_core::styles::Style>
             },
         ),
         (
             vec!["children : Children"],
             quote! {
-                #[derivative(Debug = "ignore", PartialEq = "ignore")]
+                #[derivative(Default(value="None"), Debug = "ignore", PartialEq = "ignore")]
                 pub children: #kayak_core::Children
             },
         ),
@@ -104,7 +105,7 @@ pub fn create_function_widget(f: syn::ItemFn, widget_arguments: WidgetArguments)
                 "on_event : Option <\nkayak_ui :: core :: OnEvent >",
             ],
             quote! {
-                #[derivative(Debug = "ignore", PartialEq = "ignore")]
+                #[derivative(Default(value="None"), Debug = "ignore", PartialEq = "ignore")]
                 pub on_event: Option<#kayak_core::OnEvent>
             },
         ),
@@ -149,7 +150,7 @@ pub fn create_function_widget(f: syn::ItemFn, widget_arguments: WidgetArguments)
         use #kayak_core::derivative::*;
 
         #[derive(Derivative)]
-        #[derivative(Debug, PartialEq, Clone)]
+        #[derivative(Default, Debug, PartialEq, Clone)]
         #vis struct #struct_name #impl_generics {
             pub id: #kayak_core::Index,
             #inputs_block

kayak_render_macros/src/widget_attributes.rs

@@ -107,22 +107,22 @@ impl<'a, 'c> ToTokens for CustomWidgetAttributes<'a, 'c> {
             }
         }
 
-        #[cfg(feature = "internal")]
-        let kayak_core = quote! { kayak_core };
-        #[cfg(not(feature = "internal"))]
-        let kayak_core = quote! { kayak_ui::core };
+        // #[cfg(feature = "internal")]
+        // let kayak_core = quote! { kayak_core };
+        // #[cfg(not(feature = "internal"))]
+        // let kayak_core = quote! { kayak_ui::core };
 
         let quoted = if attrs.len() == 0 {
-            quote!({ id: #kayak_core::Index::default(), styles: None, children: None, on_event: None, })
+            quote!({ ..Default::default() })
         } else {
             if !self
                 .attributes
                 .iter()
                 .any(|attribute| attribute.ident().to_token_stream().to_string() == "styles")
             {
-                quote!({ #(#attrs),*, id: #kayak_core::Index::default() })
+                quote!({ #(#attrs),*, ..Default::default() })
             } else {
-                quote!({ #(#attrs),*, id: #kayak_core::Index::default() })
+                quote!({ #(#attrs),*, ..Default::default()  })
             }
         };