/* * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> * Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org> * * SPDX-License-Identifier: BSD-2-Clause */ #pragma once #include <AK/HashMap.h> #include <AK/NonnullRefPtrVector.h> #include <AK/Optional.h> #include <AK/OwnPtr.h> #include <LibWeb/CSS/CSSFontFaceRule.h> #include <LibWeb/CSS/CSSStyleDeclaration.h> #include <LibWeb/CSS/Parser/ComponentValue.h> #include <LibWeb/CSS/Selector.h> #include <LibWeb/CSS/StyleProperties.h> #include <LibWeb/Forward.h> namespace Web::CSS { struct MatchingRule { RefPtr<CSSStyleRule> rule; size_t style_sheet_index { 0 }; size_t rule_index { 0 }; size_t selector_index { 0 }; u32 specificity { 0 }; }; class PropertyDependencyNode : public RefCounted<PropertyDependencyNode> { public: static NonnullRefPtr<PropertyDependencyNode> create(String name) { return adopt_ref(*new PropertyDependencyNode(move(name))); } void add_child(NonnullRefPtr<PropertyDependencyNode>); bool has_cycles(); private: explicit PropertyDependencyNode(String name); String m_name; NonnullRefPtrVector<PropertyDependencyNode> m_children; bool m_marked { false }; }; class StyleComputer { public: explicit StyleComputer(DOM::Document&); ~StyleComputer(); DOM::Document& document() { return m_document; } DOM::Document const& document() const { return m_document; } NonnullRefPtr<StyleProperties> create_document_style() const; NonnullRefPtr<StyleProperties> compute_style(DOM::Element&, Optional<CSS::Selector::PseudoElement> = {}) const; // https://www.w3.org/TR/css-cascade/#origin enum class CascadeOrigin { Author, User, UserAgent, Animation, Transition, }; Vector<MatchingRule> collect_matching_rules(DOM::Element const&, CascadeOrigin, Optional<CSS::Selector::PseudoElement>) const; void invalidate_rule_cache(); Gfx::Font const& initial_font() const; void did_load_font(FlyString const& family_name); void load_fonts_from_sheet(CSSStyleSheet const&); private: void compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>) const; void compute_font(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const; void compute_defaulted_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const; void absolutize_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const; void transform_box_type_if_needed(StyleProperties&, DOM::Element const&, Optional<CSS::Selector::PseudoElement>) const; void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement>) const; RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, PropertyID, UnresolvedStyleValue const&) const; bool expand_unresolved_values(DOM::Element&, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Vector<Parser::ComponentValue> const& source, Vector<Parser::ComponentValue>& dest, size_t source_start_index) const; template<typename Callback> void for_each_stylesheet(CascadeOrigin, Callback) const; Gfx::IntRect viewport_rect() const; float root_element_font_size() const; struct MatchingRuleSet { Vector<MatchingRule> user_agent_rules; Vector<MatchingRule> author_rules; }; void cascade_declarations(StyleProperties&, DOM::Element&, Vector<MatchingRule> const&, CascadeOrigin, Important important) const; void build_rule_cache(); void build_rule_cache_if_needed() const; DOM::Document& m_document; struct RuleCache { HashMap<FlyString, Vector<MatchingRule>> rules_by_id; HashMap<FlyString, Vector<MatchingRule>> rules_by_class; HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name; HashMap<Selector::PseudoElement, Vector<MatchingRule>> rules_by_pseudo_element; Vector<MatchingRule> other_rules; }; OwnPtr<RuleCache> m_rule_cache; class FontLoader; HashMap<String, NonnullOwnPtr<FontLoader>> m_loaded_fonts; }; }