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/*
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWeb/CSS/CSSStyleRule.h>
#include <LibWeb/CSS/StyleInvalidator.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
namespace Web::CSS {
StyleInvalidator::StyleInvalidator(DOM::Document& document)
: m_document(document)
{
if (!m_document.should_invalidate_styles_on_attribute_changes())
return;
auto& style_resolver = m_document.style_resolver();
m_document.for_each_in_inclusive_subtree_of_type<DOM::Element>([&](auto& element) {
m_elements_and_matching_rules_before.set(&element, style_resolver.collect_matching_rules(element));
return IterationDecision::Continue;
});
}
StyleInvalidator::~StyleInvalidator()
{
if (!m_document.should_invalidate_styles_on_attribute_changes())
return;
auto& style_resolver = m_document.style_resolver();
m_document.for_each_in_inclusive_subtree_of_type<DOM::Element>([&](auto& element) {
auto maybe_matching_rules_before = m_elements_and_matching_rules_before.get(&element);
if (!maybe_matching_rules_before.has_value()) {
element.set_needs_style_update(true);
return IterationDecision::Continue;
}
auto& matching_rules_before = maybe_matching_rules_before.value();
auto matching_rules_after = style_resolver.collect_matching_rules(element);
if (matching_rules_before.size() != matching_rules_after.size()) {
element.set_needs_style_update(true);
return IterationDecision::Continue;
}
style_resolver.sort_matching_rules(matching_rules_before);
style_resolver.sort_matching_rules(matching_rules_after);
for (size_t i = 0; i < matching_rules_before.size(); ++i) {
if (matching_rules_before[i].rule != matching_rules_after[i].rule) {
element.set_needs_style_update(true);
break;
}
}
return IterationDecision::Continue;
});
}
}
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