StyleComputer.h 5.6 KB

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  1. /*
  2. * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
  3. * Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
  4. *
  5. * SPDX-License-Identifier: BSD-2-Clause
  6. */
  7. #pragma once
  8. #include <AK/HashMap.h>
  9. #include <AK/Optional.h>
  10. #include <AK/OwnPtr.h>
  11. #include <LibWeb/CSS/CSSFontFaceRule.h>
  12. #include <LibWeb/CSS/CSSStyleDeclaration.h>
  13. #include <LibWeb/CSS/Parser/ComponentValue.h>
  14. #include <LibWeb/CSS/Parser/TokenStream.h>
  15. #include <LibWeb/CSS/Selector.h>
  16. #include <LibWeb/CSS/StyleProperties.h>
  17. #include <LibWeb/Forward.h>
  18. namespace Web::CSS {
  19. struct MatchingRule {
  20. JS::GCPtr<CSSStyleRule const> rule;
  21. size_t style_sheet_index { 0 };
  22. size_t rule_index { 0 };
  23. size_t selector_index { 0 };
  24. u32 specificity { 0 };
  25. bool contains_pseudo_element { false };
  26. };
  27. class PropertyDependencyNode : public RefCounted<PropertyDependencyNode> {
  28. public:
  29. static NonnullRefPtr<PropertyDependencyNode> create(String name)
  30. {
  31. return adopt_ref(*new PropertyDependencyNode(move(name)));
  32. }
  33. void add_child(NonnullRefPtr<PropertyDependencyNode>);
  34. bool has_cycles();
  35. private:
  36. explicit PropertyDependencyNode(String name);
  37. String m_name;
  38. Vector<NonnullRefPtr<PropertyDependencyNode>> m_children;
  39. bool m_marked { false };
  40. };
  41. struct FontFaceKey {
  42. FlyString family_name;
  43. int weight { 0 };
  44. int slope { 0 };
  45. [[nodiscard]] u32 hash() const { return pair_int_hash(family_name.hash(), pair_int_hash(weight, slope)); }
  46. [[nodiscard]] bool operator==(FontFaceKey const&) const = default;
  47. };
  48. class StyleComputer {
  49. public:
  50. explicit StyleComputer(DOM::Document&);
  51. ~StyleComputer();
  52. DOM::Document& document() { return m_document; }
  53. DOM::Document const& document() const { return m_document; }
  54. NonnullRefPtr<StyleProperties> create_document_style() const;
  55. ErrorOr<NonnullRefPtr<StyleProperties>> compute_style(DOM::Element&, Optional<CSS::Selector::PseudoElement> = {}) const;
  56. ErrorOr<RefPtr<StyleProperties>> compute_pseudo_element_style_if_needed(DOM::Element&, Optional<CSS::Selector::PseudoElement>) const;
  57. // https://www.w3.org/TR/css-cascade/#origin
  58. enum class CascadeOrigin {
  59. Author,
  60. User,
  61. UserAgent,
  62. Animation,
  63. Transition,
  64. };
  65. Vector<MatchingRule> collect_matching_rules(DOM::Element const&, CascadeOrigin, Optional<CSS::Selector::PseudoElement>) const;
  66. void invalidate_rule_cache();
  67. Gfx::Font const& initial_font() const;
  68. void did_load_font(FlyString const& family_name);
  69. void load_fonts_from_sheet(CSSStyleSheet const&);
  70. private:
  71. enum class ComputeStyleMode {
  72. Normal,
  73. CreatePseudoElementStyleIfNeeded,
  74. };
  75. ErrorOr<RefPtr<StyleProperties>> compute_style_impl(DOM::Element&, Optional<CSS::Selector::PseudoElement>, ComputeStyleMode) const;
  76. ErrorOr<void> compute_cascaded_values(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>, bool& did_match_any_pseudo_element_rules, ComputeStyleMode) const;
  77. void compute_font(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
  78. void compute_defaulted_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
  79. ErrorOr<void> absolutize_values(StyleProperties&, DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
  80. void transform_box_type_if_needed(StyleProperties&, DOM::Element const&, Optional<CSS::Selector::PseudoElement>) const;
  81. void compute_defaulted_property_value(StyleProperties&, DOM::Element const*, CSS::PropertyID, Optional<CSS::Selector::PseudoElement>) const;
  82. RefPtr<StyleValue> resolve_unresolved_style_value(DOM::Element&, Optional<CSS::Selector::PseudoElement>, PropertyID, UnresolvedStyleValue const&) const;
  83. bool expand_variables(DOM::Element&, Optional<CSS::Selector::PseudoElement>, StringView property_name, HashMap<FlyString, NonnullRefPtr<PropertyDependencyNode>>& dependencies, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
  84. bool expand_unresolved_values(DOM::Element&, StringView property_name, Parser::TokenStream<Parser::ComponentValue>& source, Vector<Parser::ComponentValue>& dest) const;
  85. template<typename Callback>
  86. void for_each_stylesheet(CascadeOrigin, Callback) const;
  87. CSSPixelRect viewport_rect() const;
  88. [[nodiscard]] Length::FontMetrics calculate_root_element_font_metrics(StyleProperties const&) const;
  89. CSSPixels parent_or_root_element_line_height(DOM::Element const*, Optional<CSS::Selector::PseudoElement>) const;
  90. struct MatchingRuleSet {
  91. Vector<MatchingRule> user_agent_rules;
  92. Vector<MatchingRule> author_rules;
  93. };
  94. void cascade_declarations(StyleProperties&, DOM::Element&, Optional<CSS::Selector::PseudoElement>, Vector<MatchingRule> const&, CascadeOrigin, Important) const;
  95. void build_rule_cache();
  96. void build_rule_cache_if_needed() const;
  97. JS::NonnullGCPtr<DOM::Document> m_document;
  98. struct RuleCache {
  99. HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
  100. HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
  101. HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name;
  102. Vector<MatchingRule> other_rules;
  103. };
  104. NonnullOwnPtr<RuleCache> make_rule_cache_for_cascade_origin(CascadeOrigin);
  105. RuleCache const& rule_cache_for_cascade_origin(CascadeOrigin) const;
  106. OwnPtr<RuleCache> m_author_rule_cache;
  107. OwnPtr<RuleCache> m_user_agent_rule_cache;
  108. class FontLoader;
  109. HashMap<FontFaceKey, NonnullOwnPtr<FontLoader>> m_loaded_fonts;
  110. Length::FontMetrics m_default_font_metrics;
  111. Length::FontMetrics m_root_element_font_metrics;
  112. };
  113. }