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style: Use placement new/delete StyleChildrenIterator FFI functions.

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MozReview-Commit-ID: L0bhymGJqRx
This commit is contained in:
Cameron McCormack 2017-06-27 17:14:14 -07:00
parent 07ede8cb2a
commit 25dde5120c
1 changed files with 20 additions and 9 deletions
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29
components/style/gecko/wrapper.rs
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@ -30,7 +30,7 @@ use gecko::global_style_data::GLOBAL_STYLE_DATA;
use gecko::selector_parser::{SelectorImpl, NonTSPseudoClass, PseudoElement};
use gecko::snapshot_helpers;
use gecko_bindings::bindings;
use gecko_bindings::bindings::{Gecko_DropStyleChildrenIterator, Gecko_MaybeCreateStyleChildrenIterator};
use gecko_bindings::bindings::{Gecko_ConstructStyleChildrenIterator, Gecko_DestroyStyleChildrenIterator};
use gecko_bindings::bindings::{Gecko_ElementState, Gecko_GetDocumentLWTheme};
use gecko_bindings::bindings::{Gecko_GetLastChild, Gecko_GetNextStyleChild};
use gecko_bindings::bindings::{Gecko_IsRootElement, Gecko_MatchesElement, Gecko_Namespace};
@ -282,12 +282,23 @@ impl<'ln> TNode for GeckoNode<'ln> {
}
fn traversal_children(&self) -> LayoutIterator<GeckoChildrenIterator<'ln>> {
let maybe_iter = unsafe { Gecko_MaybeCreateStyleChildrenIterator(self.0) };
if let Some(iter) = maybe_iter.into_owned_opt() {
LayoutIterator(GeckoChildrenIterator::GeckoIterator(iter))
} else {
LayoutIterator(self.dom_children())
if let Some(element) = self.as_element() {
// This condition is similar to the check that
// StyleChildrenIterator::IsNeeded does, except that it might return
// true if we used to (but no longer) have anonymous content from
// ::before/::after, XBL bindings, or nsIAnonymousContentCreators.
if self.is_in_anonymous_subtree() ||
element.has_xbl_binding_with_content() ||
self.may_have_anonymous_children() {
unsafe {
let mut iter: structs::StyleChildrenIterator = ::std::mem::zeroed();
Gecko_ConstructStyleChildrenIterator(element.0, &mut iter);
return LayoutIterator(GeckoChildrenIterator::GeckoIterator(iter));
}
}
}
LayoutIterator(self.dom_children())
}
fn opaque(&self) -> OpaqueNode {
@ -351,14 +362,14 @@ pub enum GeckoChildrenIterator<'a> {
/// replaces it with the next sibling when requested.
Current(Option<GeckoNode<'a>>),
/// A Gecko-implemented iterator we need to drop appropriately.
GeckoIterator(bindings::StyleChildrenIteratorOwned),
GeckoIterator(structs::StyleChildrenIterator),
}
impl<'a> Drop for GeckoChildrenIterator<'a> {
fn drop(&mut self) {
if let GeckoChildrenIterator::GeckoIterator(ref it) = *self {
if let GeckoChildrenIterator::GeckoIterator(ref mut it) = *self {
unsafe {
Gecko_DropStyleChildrenIterator(ptr::read(it as *const _));
Gecko_DestroyStyleChildrenIterator(it);
}
}
}