9c004439b8
# Objective The `States::variants` method was once used to construct `OnExit` and `OnEnter` schedules for every possible value of a given `States` type. [Since the switch to lazily initialized schedules](https://github.com/bevyengine/bevy/pull/8028/files#diff-b2fba3a0c86e496085ce7f0e3f1de5960cb754c7d215ed0f087aa556e529f97f), we no longer need to track every possible value. This also opens the door to `States` types that aren't enums. ## Solution - Remove the unused `States::variants` method and its associated type. - Remove the enum-only restriction on derived States types. --- ## Changelog - Removed `States::variants` and its associated type. - Derived `States` can now be datatypes other than enums. ## Migration Guide - `States::variants` no longer exists. If you relied on this function, consider using a library that provides enum iterators.
22 lines
685 B
Rust
22 lines
685 B
Rust
use proc_macro::TokenStream;
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use quote::{format_ident, quote};
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use syn::{parse_macro_input, DeriveInput};
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use crate::bevy_ecs_path;
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pub fn derive_states(input: TokenStream) -> TokenStream {
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let ast = parse_macro_input!(input as DeriveInput);
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let generics = ast.generics;
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let (impl_generics, ty_generics, where_clause) = generics.split_for_impl();
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let mut trait_path = bevy_ecs_path();
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trait_path.segments.push(format_ident!("schedule").into());
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trait_path.segments.push(format_ident!("States").into());
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let struct_name = &ast.ident;
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quote! {
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impl #impl_generics #trait_path for #struct_name #ty_generics #where_clause {}
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}
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.into()
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}
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