properties: accept default = value attribute

Author: pbor

glib-macros/src/properties.rs

@@ -114,6 +114,11 @@ impl Parse for PropAttr {
                 "set" => PropAttr::Set(Some(input.parse()?)),
                 "type" => PropAttr::Type(input.parse()?),
                 "member" => PropAttr::Member(input.parse()?),
+                // Special case "default = ..." and map it to .default_value(...)
+                "default" => PropAttr::BuilderField((
+                    syn::Ident::new("default_value", name.span()),
+                    Some(input.parse()?),
+                )),
                 _ => PropAttr::BuilderField((name, Some(input.parse()?))),
             }
         } else if input.peek(syn::token::Paren) {

glib-macros/tests/properties.rs

@@ -64,6 +64,8 @@ mod foo {
             fake_field: PhantomData<String>,
             #[property(get, set, explicit_notify, lax_validation)]
             custom_flags: RefCell<String>,
+            #[property(get, set, default = "hello")]
+            with_default: RefCell<String>,
             #[property(get, set, builder())]
             simple_builder: RefCell<u32>,
             #[property(get, set, builder().minimum(0).maximum(5))]
@@ -161,6 +163,17 @@ fn props() {
         ParamFlags::EXPLICIT_NOTIFY | ParamFlags::READWRITE | ParamFlags::LAX_VALIDATION
     );
 
+    // default value
+    assert_eq!(
+        myfoo
+            .find_property("with_default")
+            .unwrap()
+            .default_value()
+            .get::<String>()
+            .unwrap(),
+        "hello".to_string()
+    );
+
     // numeric builder
     assert_eq!(
         myfoo