/* * Copyright (c) 2018-2023, Andreas Kling * Copyright (c) 2021-2023, Sam Atkins * * SPDX-License-Identifier: BSD-2-Clause */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace Web::Layout { Node::Node(DOM::Document& document, DOM::Node* node) : m_dom_node(node ? *node : document) , m_anonymous(node == nullptr) { if (node) node->set_layout_node({}, *this); } Node::~Node() = default; void Node::visit_edges(Cell::Visitor& visitor) { Base::visit_edges(visitor); visitor.visit(m_dom_node); for (auto const& paintable : m_paintable) { visitor.visit(GC::Ptr { &paintable }); } visitor.visit(m_pseudo_element_generator); TreeNode::visit_edges(visitor); } // https://www.w3.org/TR/css-display-3/#out-of-flow bool Node::is_out_of_flow(FormattingContext const& formatting_context) const { // A layout node is out of flow if either: // 1. It is floated (which requires that floating is not inhibited). if (!formatting_context.inhibits_floating() && computed_values().float_() != CSS::Float::None) return true; // 2. It is "absolutely positioned". if (is_absolutely_positioned()) return true; return false; } bool Node::can_contain_boxes_with_position_absolute() const { if (computed_values().position() != CSS::Positioning::Static) return true; if (is(*this)) return true; // https://w3c.github.io/csswg-drafts/css-transforms-1/#propdef-transform // Any computed value other than none for the transform affects containing block and stacking context if (!computed_values().transformations().is_empty()) return true; return false; } static Box const* nearest_ancestor_capable_of_forming_a_containing_block(Node const& node) { for (auto const* ancestor = node.parent(); ancestor; ancestor = ancestor->parent()) { if (ancestor->is_block_container() || ancestor->display().is_flex_inside() || ancestor->display().is_grid_inside() || ancestor->is_svg_svg_box()) { return verify_cast(ancestor); } } return nullptr; } Box const* Node::containing_block() const { if (is(*this)) return nearest_ancestor_capable_of_forming_a_containing_block(*this); auto position = computed_values().position(); // https://drafts.csswg.org/css-position-3/#absolute-cb if (position == CSS::Positioning::Absolute) { auto const* ancestor = parent(); while (ancestor && !ancestor->can_contain_boxes_with_position_absolute()) ancestor = ancestor->parent(); while (ancestor && ancestor->is_anonymous()) ancestor = nearest_ancestor_capable_of_forming_a_containing_block(*ancestor); return static_cast(ancestor); } if (position == CSS::Positioning::Fixed) return &root(); return nearest_ancestor_capable_of_forming_a_containing_block(*this); } Box const* Node::static_position_containing_block() const { return nearest_ancestor_capable_of_forming_a_containing_block(*this); } Box const* Node::non_anonymous_containing_block() const { auto nearest_ancestor_box = containing_block(); VERIFY(nearest_ancestor_box); while (nearest_ancestor_box->is_anonymous()) { nearest_ancestor_box = nearest_ancestor_box->containing_block(); VERIFY(nearest_ancestor_box); } return nearest_ancestor_box; } // https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Positioning/Understanding_z_index/The_stacking_context bool Node::establishes_stacking_context() const { // NOTE: While MDN is not authoritative, there isn't a single convenient location // in the CSS specifications where the rules for stacking contexts is described. // That's why the "spec link" here points to MDN. if (!has_style()) return false; if (is_svg_box() || is_svg_svg_box()) return false; // We make a stacking context for the viewport. Painting and hit testing starts from here. if (is_viewport()) return true; // Root element of the document (). if (is_root_element()) return true; auto position = computed_values().position(); // Element with a position value absolute or relative and z-index value other than auto. if (position == CSS::Positioning::Absolute || position == CSS::Positioning::Relative) { if (computed_values().z_index().has_value()) { return true; } } // Element with a position value fixed or sticky. if (position == CSS::Positioning::Fixed || position == CSS::Positioning::Sticky) return true; if (!computed_values().transformations().is_empty()) return true; // Element that is a child of a flex container, with z-index value other than auto. if (parent() && parent()->display().is_flex_inside() && computed_values().z_index().has_value()) return true; // Element that is a child of a grid container, with z-index value other than auto. if (parent() && parent()->display().is_grid_inside() && computed_values().z_index().has_value()) return true; // https://drafts.fxtf.org/filter-effects/#FilterProperty // https://drafts.fxtf.org/filter-effects-2/#backdrop-filter-operation // A computed value of other than none results in the creation of both a stacking context // [CSS21] and a Containing Block for absolute and fixed position descendants, unless the // element it applies to is a document root element in the current browsing context. // Spec Note: This rule works in the same way as for the filter property. if (!computed_values().backdrop_filter().is_none() || !computed_values().filter().is_none()) return true; // Element with any of the following properties with value other than none: // - transform // - filter // - backdrop-filter // - perspective // - clip-path // - mask / mask-image / mask-border if (computed_values().mask().has_value() || computed_values().clip_path().has_value() || computed_values().mask_image()) return true; return computed_values().opacity() < 1.0f; } GC::Ptr Node::navigable() const { return document().navigable(); } Viewport const& Node::root() const { VERIFY(document().layout_node()); return *document().layout_node(); } Viewport& Node::root() { VERIFY(document().layout_node()); return *document().layout_node(); } bool Node::is_floating() const { if (!has_style()) return false; // flex-items don't float. if (is_flex_item()) return false; return computed_values().float_() != CSS::Float::None; } bool Node::is_positioned() const { return has_style() && computed_values().position() != CSS::Positioning::Static; } bool Node::is_absolutely_positioned() const { if (!has_style()) return false; auto position = computed_values().position(); return position == CSS::Positioning::Absolute || position == CSS::Positioning::Fixed; } bool Node::is_fixed_position() const { if (!has_style()) return false; auto position = computed_values().position(); return position == CSS::Positioning::Fixed; } bool Node::is_sticky_position() const { if (!has_style()) return false; auto position = computed_values().position(); return position == CSS::Positioning::Sticky; } NodeWithStyle::NodeWithStyle(DOM::Document& document, DOM::Node* node, CSS::StyleProperties computed_style) : Node(document, node) , m_computed_values(make()) { m_has_style = true; apply_style(computed_style); } NodeWithStyle::NodeWithStyle(DOM::Document& document, DOM::Node* node, NonnullOwnPtr computed_values) : Node(document, node) , m_computed_values(move(computed_values)) { m_has_style = true; } void NodeWithStyle::visit_edges(Visitor& visitor) { Base::visit_edges(visitor); for (auto& layer : computed_values().background_layers()) { if (layer.background_image && layer.background_image->is_image()) layer.background_image->as_image().visit_edges(visitor); } if (m_list_style_image && m_list_style_image->is_image()) m_list_style_image->as_image().visit_edges(visitor); } // https://www.w3.org/TR/css-values-4/#snap-a-length-as-a-border-width static CSSPixels snap_a_length_as_a_border_width(double device_pixels_per_css_pixel, CSSPixels length) { // 1. Assert: len is non-negative. VERIFY(length >= 0); // 2. If len is an integer number of device pixels, do nothing. auto device_pixels = length.to_double() * device_pixels_per_css_pixel; if (device_pixels == trunc(device_pixels)) return length; // 3. If len is greater than zero, but less than 1 device pixel, round len up to 1 device pixel. if (device_pixels > 0 && device_pixels < 1) return CSSPixels::nearest_value_for(1 / device_pixels_per_css_pixel); // 4. If len is greater than 1 device pixel, round it down to the nearest integer number of device pixels. if (device_pixels > 1) return CSSPixels::nearest_value_for(floor(device_pixels) / device_pixels_per_css_pixel); return length; } void NodeWithStyle::apply_style(const CSS::StyleProperties& computed_style) { auto& computed_values = mutable_computed_values(); // NOTE: color must be set first to ensure currentColor can be resolved in other properties (e.g. background-color). computed_values.set_color(computed_style.color_or_fallback(CSS::PropertyID::Color, *this, CSS::InitialValues::color())); // NOTE: We have to be careful that font-related properties get set in the right order. // m_font is used by Length::to_px() when resolving sizes against this layout node. // That's why it has to be set before everything else. computed_values.set_font_list(computed_style.computed_font_list()); computed_values.set_font_size(computed_style.property(CSS::PropertyID::FontSize).as_length().length().to_px(*this)); computed_values.set_font_weight(round_to(computed_style.property(CSS::PropertyID::FontWeight).as_number().number())); computed_values.set_line_height(computed_style.line_height()); computed_values.set_vertical_align(computed_style.vertical_align()); { auto const& attachments = computed_style.property(CSS::PropertyID::BackgroundAttachment); auto const& clips = computed_style.property(CSS::PropertyID::BackgroundClip); auto const& images = computed_style.property(CSS::PropertyID::BackgroundImage); auto const& origins = computed_style.property(CSS::PropertyID::BackgroundOrigin); auto const& x_positions = computed_style.property(CSS::PropertyID::BackgroundPositionX); auto const& y_positions = computed_style.property(CSS::PropertyID::BackgroundPositionY); auto const& repeats = computed_style.property(CSS::PropertyID::BackgroundRepeat); auto const& sizes = computed_style.property(CSS::PropertyID::BackgroundSize); auto count_layers = [](auto const& maybe_style_value) -> size_t { if (maybe_style_value.is_value_list()) return maybe_style_value.as_value_list().size(); else return 1; }; auto value_for_layer = [](auto const& style_value, size_t layer_index) -> RefPtr { if (style_value.is_value_list()) return style_value.as_value_list().value_at(layer_index, true); return style_value; }; size_t layer_count = 1; layer_count = max(layer_count, count_layers(attachments)); layer_count = max(layer_count, count_layers(clips)); layer_count = max(layer_count, count_layers(images)); layer_count = max(layer_count, count_layers(origins)); layer_count = max(layer_count, count_layers(x_positions)); layer_count = max(layer_count, count_layers(y_positions)); layer_count = max(layer_count, count_layers(repeats)); layer_count = max(layer_count, count_layers(sizes)); Vector layers; layers.ensure_capacity(layer_count); for (size_t layer_index = 0; layer_index < layer_count; layer_index++) { CSS::BackgroundLayerData layer; if (auto image_value = value_for_layer(images, layer_index); image_value) { if (image_value->is_abstract_image()) { layer.background_image = image_value->as_abstract_image(); const_cast(*layer.background_image).load_any_resources(document()); } } if (auto attachment_value = value_for_layer(attachments, layer_index); attachment_value && attachment_value->is_keyword()) { switch (attachment_value->to_keyword()) { case CSS::Keyword::Fixed: layer.attachment = CSS::BackgroundAttachment::Fixed; break; case CSS::Keyword::Local: layer.attachment = CSS::BackgroundAttachment::Local; break; case CSS::Keyword::Scroll: layer.attachment = CSS::BackgroundAttachment::Scroll; break; default: break; } } auto as_box = [](auto keyword) { switch (keyword) { case CSS::Keyword::BorderBox: return CSS::BackgroundBox::BorderBox; case CSS::Keyword::ContentBox: return CSS::BackgroundBox::ContentBox; case CSS::Keyword::PaddingBox: return CSS::BackgroundBox::PaddingBox; case CSS::Keyword::Text: return CSS::BackgroundBox::Text; default: VERIFY_NOT_REACHED(); } }; if (auto origin_value = value_for_layer(origins, layer_index); origin_value && origin_value->is_keyword()) { layer.origin = as_box(origin_value->to_keyword()); } if (auto clip_value = value_for_layer(clips, layer_index); clip_value && clip_value->is_keyword()) { layer.clip = as_box(clip_value->to_keyword()); } if (auto position_value = value_for_layer(x_positions, layer_index); position_value && position_value->is_edge()) { auto& position = position_value->as_edge(); layer.position_edge_x = position.edge(); layer.position_offset_x = position.offset(); } if (auto position_value = value_for_layer(y_positions, layer_index); position_value && position_value->is_edge()) { auto& position = position_value->as_edge(); layer.position_edge_y = position.edge(); layer.position_offset_y = position.offset(); }; if (auto size_value = value_for_layer(sizes, layer_index); size_value) { if (size_value->is_background_size()) { auto& size = size_value->as_background_size(); layer.size_type = CSS::BackgroundSize::LengthPercentage; layer.size_x = size.size_x(); layer.size_y = size.size_y(); } else if (size_value->is_keyword()) { switch (size_value->to_keyword()) { case CSS::Keyword::Contain: layer.size_type = CSS::BackgroundSize::Contain; break; case CSS::Keyword::Cover: layer.size_type = CSS::BackgroundSize::Cover; break; default: break; } } } if (auto repeat_value = value_for_layer(repeats, layer_index); repeat_value && repeat_value->is_background_repeat()) { layer.repeat_x = repeat_value->as_background_repeat().repeat_x(); layer.repeat_y = repeat_value->as_background_repeat().repeat_y(); } layers.append(move(layer)); } computed_values.set_background_layers(move(layers)); } computed_values.set_background_color(computed_style.color_or_fallback(CSS::PropertyID::BackgroundColor, *this, CSS::InitialValues::background_color())); if (auto box_sizing = computed_style.box_sizing(); box_sizing.has_value()) computed_values.set_box_sizing(box_sizing.release_value()); if (auto maybe_font_variant = computed_style.font_variant(); maybe_font_variant.has_value()) computed_values.set_font_variant(maybe_font_variant.release_value()); if (auto maybe_font_language_override = computed_style.font_language_override(); maybe_font_language_override.has_value()) computed_values.set_font_language_override(maybe_font_language_override.release_value()); if (auto maybe_font_feature_settings = computed_style.font_feature_settings(); maybe_font_feature_settings.has_value()) computed_values.set_font_feature_settings(maybe_font_feature_settings.release_value()); if (auto maybe_font_variation_settings = computed_style.font_variation_settings(); maybe_font_variation_settings.has_value()) computed_values.set_font_variation_settings(maybe_font_variation_settings.release_value()); auto const& border_bottom_left_radius = computed_style.property(CSS::PropertyID::BorderBottomLeftRadius); if (border_bottom_left_radius.is_border_radius()) { computed_values.set_border_bottom_left_radius( CSS::BorderRadiusData { border_bottom_left_radius.as_border_radius().horizontal_radius(), border_bottom_left_radius.as_border_radius().vertical_radius() }); } auto const& border_bottom_right_radius = computed_style.property(CSS::PropertyID::BorderBottomRightRadius); if (border_bottom_right_radius.is_border_radius()) { computed_values.set_border_bottom_right_radius( CSS::BorderRadiusData { border_bottom_right_radius.as_border_radius().horizontal_radius(), border_bottom_right_radius.as_border_radius().vertical_radius() }); } auto const& border_top_left_radius = computed_style.property(CSS::PropertyID::BorderTopLeftRadius); if (border_top_left_radius.is_border_radius()) { computed_values.set_border_top_left_radius( CSS::BorderRadiusData { border_top_left_radius.as_border_radius().horizontal_radius(), border_top_left_radius.as_border_radius().vertical_radius() }); } auto const& border_top_right_radius = computed_style.property(CSS::PropertyID::BorderTopRightRadius); if (border_top_right_radius.is_border_radius()) { computed_values.set_border_top_right_radius( CSS::BorderRadiusData { border_top_right_radius.as_border_radius().horizontal_radius(), border_top_right_radius.as_border_radius().vertical_radius() }); } computed_values.set_display(computed_style.display()); auto flex_direction = computed_style.flex_direction(); if (flex_direction.has_value()) computed_values.set_flex_direction(flex_direction.value()); auto flex_wrap = computed_style.flex_wrap(); if (flex_wrap.has_value()) computed_values.set_flex_wrap(flex_wrap.value()); auto flex_basis = computed_style.flex_basis(); if (flex_basis.has_value()) computed_values.set_flex_basis(flex_basis.value()); computed_values.set_flex_grow(computed_style.flex_grow()); computed_values.set_flex_shrink(computed_style.flex_shrink()); computed_values.set_order(computed_style.order()); computed_values.set_clip(computed_style.clip()); auto resolve_filter = [this](CSS::Filter const& computed_filter) -> CSS::ResolvedFilter { CSS::ResolvedFilter resolved_filter; for (auto const& filter : computed_filter.filters()) { filter.visit( [&](CSS::FilterOperation::Blur const& blur) { resolved_filter.filters.append(CSS::ResolvedFilter::Blur { .radius = blur.resolved_radius(*this) }); }, [&](CSS::FilterOperation::DropShadow const& drop_shadow) { auto context = CSS::Length::ResolutionContext::for_layout_node(*this); // The default value for omitted values is missing length values set to 0 // and the missing used color is taken from the color property. resolved_filter.filters.append(CSS::ResolvedFilter::DropShadow { .offset_x = drop_shadow.offset_x.resolved(context).to_px(*this).to_double(), .offset_y = drop_shadow.offset_y.resolved(context).to_px(*this).to_double(), .radius = drop_shadow.radius.has_value() ? drop_shadow.radius->resolved(context).to_px(*this).to_double() : 0.0, .color = drop_shadow.color.has_value() ? *drop_shadow.color : this->computed_values().color() }); }, [&](CSS::FilterOperation::Color const& color_operation) { resolved_filter.filters.append(CSS::ResolvedFilter::Color { .type = color_operation.operation, .amount = color_operation.resolved_amount() }); }, [&](CSS::FilterOperation::HueRotate const& hue_rotate) { resolved_filter.filters.append(CSS::ResolvedFilter::HueRotate { .angle_degrees = hue_rotate.angle_degrees(*this) }); }); } return resolved_filter; }; if (computed_style.backdrop_filter().has_filters()) computed_values.set_backdrop_filter(resolve_filter(computed_style.backdrop_filter())); if (computed_style.filter().has_filters()) computed_values.set_filter(resolve_filter(computed_style.filter())); auto justify_content = computed_style.justify_content(); if (justify_content.has_value()) computed_values.set_justify_content(justify_content.value()); auto justify_items = computed_style.justify_items(); if (justify_items.has_value()) computed_values.set_justify_items(justify_items.value()); auto justify_self = computed_style.justify_self(); if (justify_self.has_value()) computed_values.set_justify_self(justify_self.value()); auto accent_color = computed_style.accent_color(*this); if (accent_color.has_value()) computed_values.set_accent_color(accent_color.value()); auto align_content = computed_style.align_content(); if (align_content.has_value()) computed_values.set_align_content(align_content.value()); auto align_items = computed_style.align_items(); if (align_items.has_value()) computed_values.set_align_items(align_items.value()); auto align_self = computed_style.align_self(); if (align_self.has_value()) computed_values.set_align_self(align_self.value()); auto appearance = computed_style.appearance(); if (appearance.has_value()) computed_values.set_appearance(appearance.value()); auto position = computed_style.position(); if (position.has_value()) computed_values.set_position(position.value()); auto text_align = computed_style.text_align(); if (text_align.has_value()) computed_values.set_text_align(text_align.value()); auto text_justify = computed_style.text_justify(); if (text_align.has_value()) computed_values.set_text_justify(text_justify.value()); if (auto text_indent = computed_style.length_percentage(CSS::PropertyID::TextIndent); text_indent.has_value()) computed_values.set_text_indent(text_indent.release_value()); if (auto text_overflow = computed_style.text_overflow(); text_overflow.has_value()) computed_values.set_text_overflow(text_overflow.release_value()); auto tab_size = computed_style.tab_size(); computed_values.set_tab_size(tab_size); auto white_space = computed_style.white_space(); if (white_space.has_value()) computed_values.set_white_space(white_space.value()); auto word_break = computed_style.word_break(); if (word_break.has_value()) computed_values.set_word_break(word_break.value()); auto word_spacing = computed_style.word_spacing(); if (word_spacing.has_value()) computed_values.set_word_spacing(word_spacing.value()); auto letter_spacing = computed_style.letter_spacing(); if (letter_spacing.has_value()) computed_values.set_letter_spacing(letter_spacing.value()); auto float_ = computed_style.float_(); if (float_.has_value()) computed_values.set_float(float_.value()); computed_values.set_border_spacing_horizontal(computed_style.border_spacing_horizontal(*this)); computed_values.set_border_spacing_vertical(computed_style.border_spacing_vertical(*this)); auto caption_side = computed_style.caption_side(); if (caption_side.has_value()) computed_values.set_caption_side(caption_side.value()); auto clear = computed_style.clear(); if (clear.has_value()) computed_values.set_clear(clear.value()); auto overflow_x = computed_style.overflow_x(); if (overflow_x.has_value()) computed_values.set_overflow_x(overflow_x.value()); auto overflow_y = computed_style.overflow_y(); if (overflow_y.has_value()) computed_values.set_overflow_y(overflow_y.value()); auto content_visibility = computed_style.content_visibility(); if (content_visibility.has_value()) computed_values.set_content_visibility(content_visibility.value()); auto cursor = computed_style.cursor(); if (cursor.has_value()) computed_values.set_cursor(cursor.value()); auto image_rendering = computed_style.image_rendering(); if (image_rendering.has_value()) computed_values.set_image_rendering(image_rendering.value()); auto pointer_events = computed_style.pointer_events(); if (pointer_events.has_value()) computed_values.set_pointer_events(pointer_events.value()); computed_values.set_text_decoration_line(computed_style.text_decoration_line()); auto text_decoration_style = computed_style.text_decoration_style(); if (text_decoration_style.has_value()) computed_values.set_text_decoration_style(text_decoration_style.value()); auto text_transform = computed_style.text_transform(); if (text_transform.has_value()) computed_values.set_text_transform(text_transform.value()); if (auto list_style_type = computed_style.list_style_type(); list_style_type.has_value()) computed_values.set_list_style_type(list_style_type.value()); auto const& list_style_image = computed_style.property(CSS::PropertyID::ListStyleImage); if (list_style_image.is_abstract_image()) { m_list_style_image = list_style_image.as_abstract_image(); const_cast(*m_list_style_image).load_any_resources(document()); } if (auto list_style_position = computed_style.list_style_position(); list_style_position.has_value()) computed_values.set_list_style_position(list_style_position.value()); // FIXME: The default text decoration color value is `currentcolor`, but since we can't resolve that easily, // we just manually grab the value from `color`. This makes it dependent on `color` being // specified first, so it's far from ideal. computed_values.set_text_decoration_color(computed_style.color_or_fallback(CSS::PropertyID::TextDecorationColor, *this, computed_values.color())); if (auto maybe_text_decoration_thickness = computed_style.length_percentage(CSS::PropertyID::TextDecorationThickness); maybe_text_decoration_thickness.has_value()) computed_values.set_text_decoration_thickness(maybe_text_decoration_thickness.release_value()); computed_values.set_webkit_text_fill_color(computed_style.color_or_fallback(CSS::PropertyID::WebkitTextFillColor, *this, computed_values.color())); computed_values.set_text_shadow(computed_style.text_shadow(*this)); computed_values.set_z_index(computed_style.z_index()); computed_values.set_opacity(computed_style.opacity()); if (auto maybe_visibility = computed_style.visibility(); maybe_visibility.has_value()) computed_values.set_visibility(maybe_visibility.release_value()); computed_values.set_width(computed_style.size_value(CSS::PropertyID::Width)); computed_values.set_min_width(computed_style.size_value(CSS::PropertyID::MinWidth)); computed_values.set_max_width(computed_style.size_value(CSS::PropertyID::MaxWidth)); computed_values.set_height(computed_style.size_value(CSS::PropertyID::Height)); computed_values.set_min_height(computed_style.size_value(CSS::PropertyID::MinHeight)); computed_values.set_max_height(computed_style.size_value(CSS::PropertyID::MaxHeight)); computed_values.set_inset(computed_style.length_box(CSS::PropertyID::Left, CSS::PropertyID::Top, CSS::PropertyID::Right, CSS::PropertyID::Bottom, CSS::Length::make_auto())); computed_values.set_margin(computed_style.length_box(CSS::PropertyID::MarginLeft, CSS::PropertyID::MarginTop, CSS::PropertyID::MarginRight, CSS::PropertyID::MarginBottom, CSS::Length::make_px(0))); computed_values.set_padding(computed_style.length_box(CSS::PropertyID::PaddingLeft, CSS::PropertyID::PaddingTop, CSS::PropertyID::PaddingRight, CSS::PropertyID::PaddingBottom, CSS::Length::make_px(0))); computed_values.set_box_shadow(computed_style.box_shadow(*this)); if (auto rotate_value = computed_style.rotate(*this); rotate_value.has_value()) computed_values.set_rotate(rotate_value.value()); computed_values.set_transformations(computed_style.transformations()); if (auto transform_box = computed_style.transform_box(); transform_box.has_value()) computed_values.set_transform_box(transform_box.value()); computed_values.set_transform_origin(computed_style.transform_origin()); auto const& transition_delay_property = computed_style.property(CSS::PropertyID::TransitionDelay); if (transition_delay_property.is_time()) { auto const& transition_delay = transition_delay_property.as_time(); computed_values.set_transition_delay(transition_delay.time()); } else if (transition_delay_property.is_math()) { auto const& transition_delay = transition_delay_property.as_math(); computed_values.set_transition_delay(transition_delay.resolve_time().value()); } auto do_border_style = [&](CSS::BorderData& border, CSS::PropertyID width_property, CSS::PropertyID color_property, CSS::PropertyID style_property) { // FIXME: The default border color value is `currentcolor`, but since we can't resolve that easily, // we just manually grab the value from `color`. This makes it dependent on `color` being // specified first, so it's far from ideal. border.color = computed_style.color_or_fallback(color_property, *this, computed_values.color()); border.line_style = computed_style.line_style(style_property).value_or(CSS::LineStyle::None); // https://w3c.github.io/csswg-drafts/css-backgrounds/#border-style // none // No border. Color and width are ignored (i.e., the border has width 0). Note this means that the initial value of border-image-width will also resolve to zero. // hidden // Same as none, but has different behavior in the border conflict resolution rules for border-collapsed tables [CSS2]. if (border.line_style == CSS::LineStyle::None || border.line_style == CSS::LineStyle::Hidden) { border.width = 0; } else { auto resolve_border_width = [&]() -> CSSPixels { auto const& value = computed_style.property(width_property); if (value.is_math()) return max(CSSPixels { 0 }, value.as_math().resolve_length(*this)->to_px(*this)); if (value.is_length()) return value.as_length().length().to_px(*this); if (value.is_keyword()) { // https://www.w3.org/TR/css-backgrounds-3/#valdef-line-width-thin switch (value.to_keyword()) { case CSS::Keyword::Thin: return 1; case CSS::Keyword::Medium: return 3; case CSS::Keyword::Thick: return 5; default: VERIFY_NOT_REACHED(); } } VERIFY_NOT_REACHED(); }; border.width = snap_a_length_as_a_border_width(document().page().client().device_pixels_per_css_pixel(), resolve_border_width()); } }; do_border_style(computed_values.border_left(), CSS::PropertyID::BorderLeftWidth, CSS::PropertyID::BorderLeftColor, CSS::PropertyID::BorderLeftStyle); do_border_style(computed_values.border_top(), CSS::PropertyID::BorderTopWidth, CSS::PropertyID::BorderTopColor, CSS::PropertyID::BorderTopStyle); do_border_style(computed_values.border_right(), CSS::PropertyID::BorderRightWidth, CSS::PropertyID::BorderRightColor, CSS::PropertyID::BorderRightStyle); do_border_style(computed_values.border_bottom(), CSS::PropertyID::BorderBottomWidth, CSS::PropertyID::BorderBottomColor, CSS::PropertyID::BorderBottomStyle); if (auto const& outline_color = computed_style.property(CSS::PropertyID::OutlineColor); outline_color.has_color()) computed_values.set_outline_color(outline_color.to_color(*this)); if (auto const& outline_offset = computed_style.property(CSS::PropertyID::OutlineOffset); outline_offset.is_length()) computed_values.set_outline_offset(outline_offset.as_length().length()); if (auto const& outline_style = computed_style.outline_style(); outline_style.has_value()) computed_values.set_outline_style(outline_style.value()); if (auto const& outline_width = computed_style.property(CSS::PropertyID::OutlineWidth); outline_width.is_length()) computed_values.set_outline_width(outline_width.as_length().length()); computed_values.set_grid_auto_columns(computed_style.grid_auto_columns()); computed_values.set_grid_auto_rows(computed_style.grid_auto_rows()); computed_values.set_grid_template_columns(computed_style.grid_template_columns()); computed_values.set_grid_template_rows(computed_style.grid_template_rows()); computed_values.set_grid_column_end(computed_style.grid_column_end()); computed_values.set_grid_column_start(computed_style.grid_column_start()); computed_values.set_grid_row_end(computed_style.grid_row_end()); computed_values.set_grid_row_start(computed_style.grid_row_start()); computed_values.set_grid_template_areas(computed_style.grid_template_areas()); computed_values.set_grid_auto_flow(computed_style.grid_auto_flow()); if (auto cx_value = computed_style.length_percentage(CSS::PropertyID::Cx); cx_value.has_value()) computed_values.set_cx(*cx_value); if (auto cy_value = computed_style.length_percentage(CSS::PropertyID::Cy); cy_value.has_value()) computed_values.set_cy(*cy_value); if (auto r_value = computed_style.length_percentage(CSS::PropertyID::R); r_value.has_value()) computed_values.set_r(*r_value); if (auto rx_value = computed_style.length_percentage(CSS::PropertyID::Rx); rx_value.has_value()) computed_values.set_rx(*rx_value); if (auto ry_value = computed_style.length_percentage(CSS::PropertyID::Ry); ry_value.has_value()) computed_values.set_ry(*ry_value); if (auto x_value = computed_style.length_percentage(CSS::PropertyID::X); x_value.has_value()) computed_values.set_x(*x_value); if (auto y_value = computed_style.length_percentage(CSS::PropertyID::Y); y_value.has_value()) computed_values.set_y(*y_value); auto const& fill = computed_style.property(CSS::PropertyID::Fill); if (fill.has_color()) computed_values.set_fill(fill.to_color(*this)); else if (fill.is_url()) computed_values.set_fill(fill.as_url().url()); auto const& stroke = computed_style.property(CSS::PropertyID::Stroke); if (stroke.has_color()) computed_values.set_stroke(stroke.to_color(*this)); else if (stroke.is_url()) computed_values.set_stroke(stroke.as_url().url()); if (auto const& stop_color = computed_style.property(CSS::PropertyID::StopColor); stop_color.has_color()) computed_values.set_stop_color(stop_color.to_color(*this)); auto const& stroke_width = computed_style.property(CSS::PropertyID::StrokeWidth); // FIXME: Converting to pixels isn't really correct - values should be in "user units" // https://svgwg.org/svg2-draft/coords.html#TermUserUnits if (stroke_width.is_number()) computed_values.set_stroke_width(CSS::Length::make_px(CSSPixels::nearest_value_for(stroke_width.as_number().number()))); else if (stroke_width.is_length()) computed_values.set_stroke_width(stroke_width.as_length().length()); else if (stroke_width.is_percentage()) computed_values.set_stroke_width(CSS::LengthPercentage { stroke_width.as_percentage().percentage() }); if (auto const& mask_image = computed_style.property(CSS::PropertyID::MaskImage); mask_image.is_abstract_image()) { auto const& abstract_image = mask_image.as_abstract_image(); computed_values.set_mask_image(abstract_image); const_cast(abstract_image).load_any_resources(document()); } if (auto mask_type = computed_style.mask_type(); mask_type.has_value()) computed_values.set_mask_type(*mask_type); if (auto const& mask = computed_style.property(CSS::PropertyID::Mask); mask.is_url()) computed_values.set_mask(mask.as_url().url()); auto const& clip_path = computed_style.property(CSS::PropertyID::ClipPath); if (clip_path.is_url()) computed_values.set_clip_path(clip_path.as_url().url()); else if (clip_path.is_basic_shape()) computed_values.set_clip_path(clip_path.as_basic_shape()); if (auto clip_rule = computed_style.clip_rule(); clip_rule.has_value()) computed_values.set_clip_rule(*clip_rule); if (auto fill_rule = computed_style.fill_rule(); fill_rule.has_value()) computed_values.set_fill_rule(*fill_rule); computed_values.set_fill_opacity(computed_style.fill_opacity()); auto const& stroke_dashoffset = computed_style.property(CSS::PropertyID::StrokeDashoffset); // FIXME: Converting to pixels isn't really correct - values should be in "user units" // https://svgwg.org/svg2-draft/coords.html#TermUserUnits if (stroke_dashoffset.is_number()) computed_values.set_stroke_dashoffset(CSS::Length::make_px(CSSPixels::nearest_value_for(stroke_dashoffset.as_number().number()))); else if (stroke_dashoffset.is_length()) computed_values.set_stroke_dashoffset(stroke_dashoffset.as_length().length()); else if (stroke_dashoffset.is_percentage()) computed_values.set_stroke_dashoffset(CSS::LengthPercentage { stroke_dashoffset.as_percentage().percentage() }); if (auto stroke_linecap = computed_style.stroke_linecap(); stroke_linecap.has_value()) computed_values.set_stroke_linecap(stroke_linecap.value()); if (auto stroke_linejoin = computed_style.stroke_linejoin(); stroke_linejoin.has_value()) computed_values.set_stroke_linejoin(stroke_linejoin.value()); computed_values.set_stroke_miterlimit(computed_style.stroke_miterlimit()); computed_values.set_stroke_opacity(computed_style.stroke_opacity()); computed_values.set_stop_opacity(computed_style.stop_opacity()); if (auto text_anchor = computed_style.text_anchor(); text_anchor.has_value()) computed_values.set_text_anchor(*text_anchor); if (auto const& column_count = computed_style.property(CSS::PropertyID::ColumnCount); column_count.is_integer()) computed_values.set_column_count(CSS::ColumnCount::make_integer(column_count.as_integer().integer())); if (auto column_span = computed_style.column_span(); column_span.has_value()) computed_values.set_column_span(column_span.value()); computed_values.set_column_width(computed_style.size_value(CSS::PropertyID::ColumnWidth)); computed_values.set_column_gap(computed_style.gap_value(CSS::PropertyID::ColumnGap)); computed_values.set_row_gap(computed_style.gap_value(CSS::PropertyID::RowGap)); if (auto border_collapse = computed_style.border_collapse(); border_collapse.has_value()) computed_values.set_border_collapse(border_collapse.value()); if (auto table_layout = computed_style.table_layout(); table_layout.has_value()) computed_values.set_table_layout(table_layout.value()); auto const& aspect_ratio = computed_style.property(CSS::PropertyID::AspectRatio); if (aspect_ratio.is_value_list()) { auto const& values_list = aspect_ratio.as_value_list().values(); if (values_list.size() == 2 && values_list[0]->is_keyword() && values_list[0]->as_keyword().keyword() == CSS::Keyword::Auto && values_list[1]->is_ratio()) { computed_values.set_aspect_ratio({ true, values_list[1]->as_ratio().ratio() }); } } else if (aspect_ratio.is_keyword() && aspect_ratio.as_keyword().keyword() == CSS::Keyword::Auto) { computed_values.set_aspect_ratio({ true, {} }); } else if (aspect_ratio.is_ratio()) { // https://drafts.csswg.org/css-sizing-4/#aspect-ratio // If the is degenerate, the property instead behaves as auto. if (aspect_ratio.as_ratio().ratio().is_degenerate()) computed_values.set_aspect_ratio({ true, {} }); else computed_values.set_aspect_ratio({ false, aspect_ratio.as_ratio().ratio() }); } auto const& math_shift_value = computed_style.property(CSS::PropertyID::MathShift); if (auto math_shift = keyword_to_math_shift(math_shift_value.to_keyword()); math_shift.has_value()) computed_values.set_math_shift(math_shift.value()); auto const& math_style_value = computed_style.property(CSS::PropertyID::MathStyle); if (auto math_style = keyword_to_math_style(math_style_value.to_keyword()); math_style.has_value()) computed_values.set_math_style(math_style.value()); computed_values.set_math_depth(computed_style.math_depth()); computed_values.set_quotes(computed_style.quotes()); computed_values.set_counter_increment(computed_style.counter_data(CSS::PropertyID::CounterIncrement)); computed_values.set_counter_reset(computed_style.counter_data(CSS::PropertyID::CounterReset)); computed_values.set_counter_set(computed_style.counter_data(CSS::PropertyID::CounterSet)); if (auto object_fit = computed_style.object_fit(); object_fit.has_value()) computed_values.set_object_fit(object_fit.value()); computed_values.set_object_position(computed_style.object_position()); if (auto direction = computed_style.direction(); direction.has_value()) computed_values.set_direction(direction.value()); if (auto unicode_bidi = computed_style.unicode_bidi(); unicode_bidi.has_value()) computed_values.set_unicode_bidi(unicode_bidi.value()); if (auto scrollbar_width = computed_style.scrollbar_width(); scrollbar_width.has_value()) computed_values.set_scrollbar_width(scrollbar_width.value()); if (auto writing_mode = computed_style.writing_mode(); writing_mode.has_value()) computed_values.set_writing_mode(writing_mode.value()); propagate_style_to_anonymous_wrappers(); } void NodeWithStyle::propagate_style_to_anonymous_wrappers() { // Update the style of any anonymous wrappers that inherit from this node. // FIXME: This is pretty hackish. It would be nicer if they shared the inherited style // data structure somehow, so this wasn't necessary. // If this is a `display:table` box with an anonymous wrapper parent, // the parent inherits style from *this* node, not the other way around. if (display().is_table_inside() && is(parent())) { auto& table_wrapper = *static_cast(parent()); static_cast(static_cast(const_cast(table_wrapper.computed_values()))).inherit_from(computed_values()); transfer_table_box_computed_values_to_wrapper_computed_values(table_wrapper.mutable_computed_values()); } // Propagate style to all anonymous children (except table wrappers!) for_each_child_of_type([&](NodeWithStyle& child) { if (child.is_anonymous() && !is(child)) { auto& child_computed_values = static_cast(static_cast(const_cast(child.computed_values()))); child_computed_values.inherit_from(computed_values()); } return IterationDecision::Continue; }); } bool Node::is_root_element() const { if (is_anonymous()) return false; return is(*dom_node()); } String Node::debug_description() const { StringBuilder builder; builder.append(class_name()); if (dom_node()) { builder.appendff("<{}>", dom_node()->node_name()); if (dom_node()->is_element()) { auto& element = static_cast(*dom_node()); if (element.id().has_value()) builder.appendff("#{}", element.id().value()); for (auto const& class_name : element.class_names()) builder.appendff(".{}", class_name); } } else { builder.append("(anonymous)"sv); } return MUST(builder.to_string()); } CSS::Display Node::display() const { if (!has_style()) { // NOTE: No style means this is dumb text content. return CSS::Display(CSS::DisplayOutside::Inline, CSS::DisplayInside::Flow); } return computed_values().display(); } bool Node::is_inline() const { return display().is_inline_outside(); } bool Node::is_inline_block() const { auto display = this->display(); return display.is_inline_outside() && display.is_flow_root_inside(); } bool Node::is_inline_table() const { auto display = this->display(); return display.is_inline_outside() && display.is_table_inside(); } GC::Ref NodeWithStyle::create_anonymous_wrapper() const { auto wrapper = heap().allocate(const_cast(document()), nullptr, computed_values().clone_inherited_values()); wrapper->mutable_computed_values().set_display(CSS::Display(CSS::DisplayOutside::Block, CSS::DisplayInside::Flow)); // NOTE: These properties are not inherited, but we still have to propagate them to anonymous wrappers. wrapper->mutable_computed_values().set_text_decoration_line(computed_values().text_decoration_line()); wrapper->mutable_computed_values().set_text_decoration_thickness(computed_values().text_decoration_thickness()); wrapper->mutable_computed_values().set_text_decoration_color(computed_values().text_decoration_color()); wrapper->mutable_computed_values().set_text_decoration_style(computed_values().text_decoration_style()); return *wrapper; } void NodeWithStyle::reset_table_box_computed_values_used_by_wrapper_to_init_values() { VERIFY(this->display().is_table_inside()); auto& mutable_computed_values = this->mutable_computed_values(); mutable_computed_values.set_position(CSS::InitialValues::position()); mutable_computed_values.set_float(CSS::InitialValues::float_()); mutable_computed_values.set_clear(CSS::InitialValues::clear()); mutable_computed_values.set_inset(CSS::InitialValues::inset()); mutable_computed_values.set_margin(CSS::InitialValues::margin()); } void NodeWithStyle::transfer_table_box_computed_values_to_wrapper_computed_values(CSS::ComputedValues& wrapper_computed_values) { // The computed values of properties 'position', 'float', 'margin-*', 'top', 'right', 'bottom', and 'left' on the table element are used on the table wrapper box and not the table box; // all other values of non-inheritable properties are used on the table box and not the table wrapper box. // (Where the table element's values are not used on the table and table wrapper boxes, the initial values are used instead.) auto& mutable_wrapper_computed_values = static_cast(wrapper_computed_values); if (display().is_inline_outside()) mutable_wrapper_computed_values.set_display(CSS::Display::from_short(CSS::Display::Short::InlineBlock)); else mutable_wrapper_computed_values.set_display(CSS::Display::from_short(CSS::Display::Short::FlowRoot)); mutable_wrapper_computed_values.set_position(computed_values().position()); mutable_wrapper_computed_values.set_inset(computed_values().inset()); mutable_wrapper_computed_values.set_float(computed_values().float_()); mutable_wrapper_computed_values.set_clear(computed_values().clear()); mutable_wrapper_computed_values.set_margin(computed_values().margin()); reset_table_box_computed_values_used_by_wrapper_to_init_values(); } bool NodeWithStyle::is_body() const { return dom_node() && dom_node() == document().body(); } static bool overflow_value_makes_box_a_scroll_container(CSS::Overflow overflow) { switch (overflow) { case CSS::Overflow::Clip: case CSS::Overflow::Visible: return false; case CSS::Overflow::Auto: case CSS::Overflow::Hidden: case CSS::Overflow::Scroll: return true; } VERIFY_NOT_REACHED(); } bool NodeWithStyle::is_scroll_container() const { // NOTE: This isn't in the spec, but we want the viewport to behave like a scroll container. if (is_viewport()) return true; return overflow_value_makes_box_a_scroll_container(computed_values().overflow_x()) || overflow_value_makes_box_a_scroll_container(computed_values().overflow_y()); } void Node::add_paintable(GC::Ptr paintable) { if (!paintable) return; m_paintable.append(*paintable); } void Node::clear_paintables() { m_paintable.clear(); } GC::Ptr Node::create_paintable() const { return nullptr; } bool Node::is_anonymous() const { return m_anonymous; } DOM::Node const* Node::dom_node() const { if (m_anonymous) return nullptr; return m_dom_node.ptr(); } DOM::Node* Node::dom_node() { if (m_anonymous) return nullptr; return m_dom_node.ptr(); } DOM::Element const* Node::pseudo_element_generator() const { VERIFY(m_generated_for != GeneratedFor::NotGenerated); return m_pseudo_element_generator.ptr(); } DOM::Element* Node::pseudo_element_generator() { VERIFY(m_generated_for != GeneratedFor::NotGenerated); return m_pseudo_element_generator.ptr(); } DOM::Document& Node::document() { return m_dom_node->document(); } DOM::Document const& Node::document() const { return m_dom_node->document(); } }