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LibWeb: Improvements to Node::invalidate_style()

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- Access members directly instead of going through accessors,
  avoiding a lot of redundant traversal done by accessors.

- Cross shadow boundaries and make sure that shadow trees get their
  dirty bits updated as well.

- Do the minimum amount of traversal needed when setting the "child
  needs style update" bit upwards through ancestors.
This commit is contained in:
Andreas Kling 2022-03-14 21:40:34 +01:00
parent 544c796bcf
commit 03d6e1953f
1 changed files with 14 additions and 2 deletions
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16
Userland/Libraries/LibWeb/DOM/Node.cpp
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@ -176,10 +176,22 @@ void Node::set_node_value(const String& value)
void Node::invalidate_style()
{
for_each_in_inclusive_subtree_of_type<Element>([&](auto& element) {
element.set_needs_style_update(true);
for_each_in_inclusive_subtree([&](Node& node) {
node.m_needs_style_update = true;
if (node.has_children())
node.m_child_needs_style_update = true;
if (auto* shadow_root = node.is_element() ? static_cast<DOM::Element&>(node).shadow_root() : nullptr) {
shadow_root->m_needs_style_update = true;
if (shadow_root->has_children())
shadow_root->m_child_needs_style_update = true;
}
return IterationDecision::Continue;
});
for (auto* ancestor = parent_or_shadow_host(); ancestor; ancestor = parent_or_shadow_host()) {
if (ancestor->m_child_needs_style_update)
break;
ancestor->m_child_needs_style_update = true;
}
document().schedule_style_update();
}