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-rw-r--r--servo/components/style/gecko/traversal.rs53
1 files changed, 53 insertions, 0 deletions
diff --git a/servo/components/style/gecko/traversal.rs b/servo/components/style/gecko/traversal.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! Gecko-specific bits for the styling DOM traversal.
+
+use crate::context::{SharedStyleContext, StyleContext};
+use crate::dom::{TElement, TNode};
+use crate::gecko::wrapper::{GeckoElement, GeckoNode};
+use crate::traversal::{recalc_style_at, DomTraversal, PerLevelTraversalData};
+
+/// This is the simple struct that Gecko uses to encapsulate a DOM traversal for
+/// styling.
+pub struct RecalcStyleOnly<'a> {
+ shared: SharedStyleContext<'a>,
+}
+
+impl<'a> RecalcStyleOnly<'a> {
+ /// Create a `RecalcStyleOnly` traversal from a `SharedStyleContext`.
+ pub fn new(shared: SharedStyleContext<'a>) -> Self {
+ RecalcStyleOnly { shared: shared }
+ }
+}
+
+impl<'recalc, 'le> DomTraversal<GeckoElement<'le>> for RecalcStyleOnly<'recalc> {
+ fn process_preorder<F>(
+ &self,
+ traversal_data: &PerLevelTraversalData,
+ context: &mut StyleContext<GeckoElement<'le>>,
+ node: GeckoNode<'le>,
+ note_child: F,
+ ) where
+ F: FnMut(GeckoNode<'le>),
+ {
+ if let Some(el) = node.as_element() {
+ let mut data = unsafe { el.ensure_data() };
+ recalc_style_at(self, traversal_data, context, el, &mut data, note_child);
+ }
+ }
+
+ fn process_postorder(&self, _: &mut StyleContext<GeckoElement<'le>>, _: GeckoNode<'le>) {
+ unreachable!();
+ }
+
+ /// We don't use the post-order traversal for anything.
+ fn needs_postorder_traversal() -> bool {
+ false
+ }
+
+ fn shared_context(&self) -> &SharedStyleContext {
+ &self.shared
+ }
+}