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Add preference observer API for runtime webxr preference changes (#38649)

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Adds a global preference observer that is notified whenever any
preference value is updated. This is used to support runtime
configuration of WebXR automated testing, which is a prerequisite for
running multiple WPT tests in a single browser session.

Testing: Ran `./mach test-wpt /webxr --product=servodriver`
Fixes: #38647

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-08-16 04:49:13 -04:00 • committed by GitHub
parent fc3feceee5
commit f19b2f6e84
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4 changed files with 63 additions and 6 deletions
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12
components/config/macro/lib.rs
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@ -34,6 +34,12 @@ fn servo_preferences_derive(input: synstructure::Structure) -> TokenStream {
set_match_cases.extend(quote!(stringify!(#name) => self.#name = value.try_into().unwrap(),))
}
let mut comparisons = quote!();
for field in named_fields.named.iter() {
let name = field.ident.as_ref().unwrap();
comparisons.extend(quote!(if self.#name != other.#name { changes.push((stringify!(#name), self.#name.clone().into(),)) }))
}
let structure_name = &ast.ident;
quote! {
impl #structure_name {
@ -50,6 +56,12 @@ fn servo_preferences_derive(input: synstructure::Structure) -> TokenStream {
_ => { panic!("Unknown preference: {:?}", name); }
}
}
pub fn diff(&self, other: &Self) -> Vec<(&'static str, PrefValue)> {
let mut changes = vec![];
#comparisons
changes
}
}
}
}