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f8dd3e14ba
Resolved style is a spec concept that refers to the weird mix of computed style and used style reflected by getComputedStyle(). The purpose of this class is to produce the *computed* style for a given element, so let's call it StyleComputer.
55 lines
2 KiB
C++
55 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/CSSStyleRule.h>
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#include <LibWeb/CSS/StyleInvalidator.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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namespace Web::CSS {
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StyleInvalidator::StyleInvalidator(DOM::Document& document)
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: m_document(document)
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{
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if (!m_document.should_invalidate_styles_on_attribute_changes())
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return;
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auto& style_computer = m_document.style_computer();
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m_document.for_each_in_inclusive_subtree_of_type<DOM::Element>([&](auto& element) {
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m_elements_and_matching_rules_before.set(&element, style_computer.collect_matching_rules(element));
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return IterationDecision::Continue;
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});
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}
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StyleInvalidator::~StyleInvalidator()
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{
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if (!m_document.should_invalidate_styles_on_attribute_changes())
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return;
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auto& style_computer = m_document.style_computer();
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m_document.for_each_in_inclusive_subtree_of_type<DOM::Element>([&](auto& element) {
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auto maybe_matching_rules_before = m_elements_and_matching_rules_before.get(&element);
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if (!maybe_matching_rules_before.has_value()) {
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element.set_needs_style_update(true);
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return IterationDecision::Continue;
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}
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auto& matching_rules_before = maybe_matching_rules_before.value();
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auto matching_rules_after = style_computer.collect_matching_rules(element);
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if (matching_rules_before.size() != matching_rules_after.size()) {
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element.set_needs_style_update(true);
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return IterationDecision::Continue;
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}
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style_computer.sort_matching_rules(matching_rules_before);
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style_computer.sort_matching_rules(matching_rules_after);
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for (size_t i = 0; i < matching_rules_before.size(); ++i) {
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if (matching_rules_before[i].rule != matching_rules_after[i].rule) {
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element.set_needs_style_update(true);
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break;
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}
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}
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return IterationDecision::Continue;
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});
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}
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}
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