1 files changed, 35 insertions, 0 deletions
diff --git a/servo/components/style_derive/to_animated_value.rs b/servo/components/style_derive/to_animated_value.rs
new file mode 100644
index 0000000000..45282f0c44
--- /dev/null
+++ b/servo/components/style_derive/to_animated_value.rs
@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use proc_macro2::TokenStream;
+use syn::DeriveInput;
+use synstructure::BindStyle;
+use to_computed_value;
+
+pub fn derive(input: DeriveInput) -> TokenStream {
+    let trait_impl = |from_body, to_body| {
+        quote! {
+             #[inline]
+             fn from_animated_value(from: Self::AnimatedValue) -> Self {
+                 #from_body
+             }
+
+             #[inline]
+             fn to_animated_value(self) -> Self::AnimatedValue {
+                 #to_body
+             }
+        }
+    };
+
+    to_computed_value::derive_to_value(
+        input,
+        parse_quote!(crate::values::animated::ToAnimatedValue),
+        parse_quote!(AnimatedValue),
+        BindStyle::Move,
+        |_| Default::default(),
+        |binding| quote!(crate::values::animated::ToAnimatedValue::from_animated_value(#binding)),
+        |binding| quote!(crate::values::animated::ToAnimatedValue::to_animated_value(#binding)),
+        trait_impl,
+    )
+}