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Support #[animation(constant)] when deriving ToAnimatedZero

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This commit is contained in:
Anthony Ramine 2017-08-26 00:07:02 +02:00
parent 405e34aa74
commit 8101887d31
4 changed files with 23 additions and 31 deletions
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23
components/style_derive/to_animated_zero.rs
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@ -2,7 +2,7 @@
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use animate::AnimateAttrs;
use animate::{AnimateAttrs, AnimateFieldAttrs};
use cg;
use quote;
use syn;
@ -25,10 +25,23 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
let bindings_pairs = bindings.into_iter().zip(mapped_bindings);
let mut computations = quote!();
computations.append_all(bindings_pairs.map(|(binding, mapped_binding)| {
where_clause.add_trait_bound(binding.field.ty.clone());
quote! {
let #mapped_binding =
::values::animated::ToAnimatedZero::to_animated_zero(#binding)?;
let field_attrs = cg::parse_field_attrs::<AnimateFieldAttrs>(&binding.field);
if field_attrs.constant {
if cg::is_parameterized(&binding.field.ty, where_clause.params) {
where_clause.inner.predicates.push(cg::where_predicate(
binding.field.ty.clone(),
&["std", "clone", "Clone"],
));
}
quote! {
let #mapped_binding = ::std::clone::Clone::clone(#binding);
}
} else {
where_clause.add_trait_bound(binding.field.ty.clone());
quote! {
let #mapped_binding =
::values::animated::ToAnimatedZero::to_animated_zero(#binding)?;
}
}
}));
computations.append(quote! { Ok(#mapped) });