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style: Add a Document::elements_with_id API.

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MozReview-Commit-ID: BNtbJp0RI68
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
This commit is contained in:
Emilio Cobos Álvarez 2017-10-27 11:45:34 +02:00
parent 3b0940342c
commit 2783297fa9
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2 changed files with 31 additions and 0 deletions
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20
components/style/gecko/wrapper.rs
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@ -110,6 +110,26 @@ impl<'ld> TDocument for GeckoDocument<'ld> {
fn quirks_mode(&self) -> QuirksMode {
self.0.mCompatMode.into()
}
fn elements_with_id(&self, id: &Atom) -> Result<&[GeckoElement<'ld>], ()> {
unsafe {
let array = bindings::Gecko_GetElementsWithId(self.0, id.as_ptr());
if array.is_null() {
return Ok(&[]);
}
let elements: &[*mut RawGeckoElement] = &**array;
// NOTE(emilio): We rely on the in-memory representation of
// GeckoElement<'ld> and *mut RawGeckoElement being the same.
#[allow(dead_code)]
unsafe fn static_assert() {
mem::transmute::<*mut RawGeckoElement, GeckoElement<'static>>(0xbadc0de as *mut _);
}
Ok(mem::transmute(elements))
}
}
}
/// A simple wrapper over a non-null Gecko node (`nsINode`) pointer.