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style: Implement shadow part forwarding (minus invalidation).

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Some of the stuff, in particular inside GeckoBindings stuff should be
refactored to be less ugly and duplicate a bit less code, but the rest of the
code should be landable as is.

Some invalidation changes are already needed because we weren't matching with
the right shadow host during invalidation (which made existing ::part() tests
fail).

Pending invalidation work:

 * Making exportparts work right on the snapshots.
 * Invalidating parts from descendant hosts.

They're not very hard but I need to think how to best implement it:

 * Maybe get rid of ShadowRoot::mParts and just walk DOM descendants in the
   Shadow DOM.

 * Maybe implement a ElementHasExportPartsAttr much like HasPartAttr and use
   that to keep the list of elements.

 * Maybe invalidate :host and ::part() together in here[1]

 * Maybe something else.

Opinions?

[1]: https://searchfox.org/mozilla-central/rev/131338e5017bc0283d86fb73844407b9a2155c98/servo/components/style/invalidation/element/invalidator.rs#561

Differential Revision: https://phabricator.services.mozilla.com/D53730
This commit is contained in:
Emilio Cobos Álvarez 2019-11-21 10:32:32 +00:00
parent 576883d538
commit e3009a4de9
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9 changed files with 180 additions and 47 deletions
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14
components/selectors/tree.rs
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@ -117,6 +117,20 @@ pub trait Element: Sized + Clone + Debug {
case_sensitivity: CaseSensitivity,
) -> bool;
/// Returns the mapping from the `exportparts` attribute in the regular
/// direction, that is, inner-tree -> outer-tree.
fn exported_part(
&self,
name: &<Self::Impl as SelectorImpl>::PartName,
) -> Option<<Self::Impl as SelectorImpl>::PartName>;
/// Returns the mapping from the `exportparts` attribute in the reverse
/// direction, that is, in an outer-tree -> inner-tree direction.
fn imported_part(
&self,
name: &<Self::Impl as SelectorImpl>::PartName,
) -> Option<<Self::Impl as SelectorImpl>::PartName>;
fn is_part(&self, name: &<Self::Impl as SelectorImpl>::PartName) -> bool;
/// Returns whether this element matches `:empty`.