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Introduce #[animation(constant)] for the Animate trait
This allows us to handle fields that should be the same during animations.
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parent
e49dbc4dfa
commit
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5 changed files with 59 additions and 52 deletions
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@ -28,9 +28,30 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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let mut computations = quote!();
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let iter = result_info.iter().zip(this_info.iter().zip(&other_info));
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computations.append_all(iter.map(|(result, (this, other))| {
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where_clause.add_trait_bound(this.field.ty.clone());
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quote! {
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let #result = ::values::animated::Animate::animate(#this, #other, procedure)?;
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let field_attrs = cg::parse_field_attrs::<AnimateFieldAttrs>(&result.field);
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if field_attrs.constant {
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if cg::is_parameterized(&result.field.ty, where_clause.params) {
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where_clause.inner.predicates.push(cg::where_predicate(
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result.field.ty.clone(),
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&["std", "cmp", "PartialEq"],
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));
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where_clause.inner.predicates.push(cg::where_predicate(
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result.field.ty.clone(),
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&["std", "clone", "Clone"],
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));
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}
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quote! {
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if #this != #other {
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return Err(());
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}
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let #result = ::std::clone::Clone::clone(#this);
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}
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} else {
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where_clause.add_trait_bound(result.field.ty.clone());
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quote! {
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let #result =
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::values::animated::Animate::animate(#this, #other, procedure)?;
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}
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}
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}));
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Some(quote! {
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@ -67,3 +88,9 @@ pub fn derive(input: syn::DeriveInput) -> quote::Tokens {
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pub struct AnimateAttrs {
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pub error: bool,
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}
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#[derive(Default, FromField)]
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#[darling(attributes(animation), default)]
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pub struct AnimateFieldAttrs {
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pub constant: bool,
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}
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