53 lines
1.7 KiB
Rust
53 lines
1.7 KiB
Rust
use proc_macro::TokenStream;
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use quote::quote;
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use syn::{parse_macro_input, DeriveInput, GenericParam};
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pub fn derive_element(input: TokenStream) -> TokenStream {
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let ast = parse_macro_input!(input as DeriveInput);
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let type_name = ast.ident;
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let mut state_type = quote! { () };
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for param in &ast.generics.params {
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if let GenericParam::Type(type_param) = param {
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let type_ident = &type_param.ident;
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state_type = quote! {#type_ident};
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}
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}
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let (impl_generics, ty_generics, where_clause) = ast.generics.split_for_impl();
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let gen = quote! {
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impl #impl_generics gpui3::Element for #type_name #ty_generics
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#where_clause
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{
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type State = #state_type;
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type FrameState = gpui3::AnyElement<#state_type>;
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fn layout(
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&mut self,
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state: &mut #state_type,
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cx: &mut gpui3::ViewContext<Self::State>,
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) -> anyhow::Result<(gpui3::LayoutId, Self::FrameState)> {
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use gpui3::IntoAnyElement;
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let mut rendered_element = self.render(cx).into_any();
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let layout_id = rendered_element.layout(state, cx)?;
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Ok((layout_id, rendered_element))
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}
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fn paint(
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&mut self,
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bounds: gpui3::Bounds<gpui3::Pixels>,
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state: &mut Self::State,
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rendered_element: &mut Self::FrameState,
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cx: &mut gpui3::ViewContext<Self::State>,
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) -> anyhow::Result<()> {
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// TODO: Where do we get the `offset` from?
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rendered_element.paint(state, None, cx)
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}
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}
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};
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gen.into()
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}
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