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c0e0cb86e1
This avoids costly conversions from StringView to FlyString in CSS parsing and variable expansion.
592 lines
30 KiB
C++
592 lines
30 KiB
C++
/*
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* Copyright (c) 2021-2023, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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* Copyright (c) 2022-2023, Sam Atkins <atkinssj@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 <AK/Debug.h>
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#include <AK/Format.h>
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#include <AK/NonnullRefPtr.h>
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#include <LibWeb/CSS/Enums.h>
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#include <LibWeb/CSS/ResolvedCSSStyleDeclaration.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/CSS/StyleValues/BackgroundRepeatStyleValue.h>
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#include <LibWeb/CSS/StyleValues/BackgroundSizeStyleValue.h>
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#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
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#include <LibWeb/CSS/StyleValues/CalculatedStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
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#include <LibWeb/CSS/StyleValues/EdgeStyleValue.h>
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#include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
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#include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
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#include <LibWeb/CSS/StyleValues/IdentifierStyleValue.h>
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#include <LibWeb/CSS/StyleValues/InitialStyleValue.h>
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#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
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#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
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#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
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#include <LibWeb/CSS/StyleValues/PositionStyleValue.h>
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#include <LibWeb/CSS/StyleValues/RatioStyleValue.h>
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#include <LibWeb/CSS/StyleValues/RectStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ShadowStyleValue.h>
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#include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
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#include <LibWeb/CSS/StyleValues/StyleValueList.h>
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#include <LibWeb/CSS/StyleValues/TimeStyleValue.h>
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#include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
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#include <LibWeb/CSS/StyleValues/URLStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Layout/Viewport.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/Painting/ViewportPaintable.h>
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namespace Web::CSS {
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JS_DEFINE_ALLOCATOR(ResolvedCSSStyleDeclaration);
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JS::NonnullGCPtr<ResolvedCSSStyleDeclaration> ResolvedCSSStyleDeclaration::create(DOM::Element& element)
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{
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return element.realm().heap().allocate<ResolvedCSSStyleDeclaration>(element.realm(), element);
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}
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ResolvedCSSStyleDeclaration::ResolvedCSSStyleDeclaration(DOM::Element& element)
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: CSSStyleDeclaration(element.realm())
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, m_element(element)
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{
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}
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void ResolvedCSSStyleDeclaration::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_element);
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}
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// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-length
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size_t ResolvedCSSStyleDeclaration::length() const
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{
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// The length attribute must return the number of CSS declarations in the declarations.
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// FIXME: Include the number of custom properties.
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return to_underlying(last_longhand_property_id) - to_underlying(first_longhand_property_id) + 1;
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}
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// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-item
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String ResolvedCSSStyleDeclaration::item(size_t index) const
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{
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// The item(index) method must return the property name of the CSS declaration at position index.
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// FIXME: Return custom properties if index > last_longhand_property_id.
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if (index > length())
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return {};
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auto property_id = static_cast<PropertyID>(index + to_underlying(first_longhand_property_id));
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return string_from_property_id(property_id).to_string();
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}
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static NonnullRefPtr<StyleValue const> style_value_for_background_property(Layout::NodeWithStyle const& layout_node, Function<NonnullRefPtr<StyleValue const>(BackgroundLayerData const&)> callback, Function<NonnullRefPtr<StyleValue const>()> default_value)
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{
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auto const& background_layers = layout_node.background_layers();
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if (background_layers.is_empty())
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return default_value();
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if (background_layers.size() == 1)
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return callback(background_layers.first());
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StyleValueVector values;
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values.ensure_capacity(background_layers.size());
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for (auto const& layer : background_layers)
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values.unchecked_append(callback(layer));
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return StyleValueList::create(move(values), StyleValueList::Separator::Comma);
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}
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static NonnullRefPtr<StyleValue const> style_value_for_length_percentage(LengthPercentage const& length_percentage)
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{
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if (length_percentage.is_auto())
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return IdentifierStyleValue::create(ValueID::Auto);
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if (length_percentage.is_percentage())
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return PercentageStyleValue::create(length_percentage.percentage());
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if (length_percentage.is_length())
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return LengthStyleValue::create(length_percentage.length());
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return length_percentage.calculated();
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}
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static NonnullRefPtr<StyleValue const> style_value_for_size(Size const& size)
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{
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if (size.is_none())
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return IdentifierStyleValue::create(ValueID::None);
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if (size.is_percentage())
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return PercentageStyleValue::create(size.percentage());
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if (size.is_length())
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return LengthStyleValue::create(size.length());
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if (size.is_auto())
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return IdentifierStyleValue::create(ValueID::Auto);
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if (size.is_calculated())
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return size.calculated();
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if (size.is_min_content())
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return IdentifierStyleValue::create(ValueID::MinContent);
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if (size.is_max_content())
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return IdentifierStyleValue::create(ValueID::MaxContent);
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// FIXME: Support fit-content(<length>)
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if (size.is_fit_content())
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return IdentifierStyleValue::create(ValueID::FitContent);
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TODO();
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}
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static NonnullRefPtr<StyleValue const> style_value_for_sided_shorthand(ValueComparingNonnullRefPtr<StyleValue const> top, ValueComparingNonnullRefPtr<StyleValue const> right, ValueComparingNonnullRefPtr<StyleValue const> bottom, ValueComparingNonnullRefPtr<StyleValue const> left)
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{
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bool top_and_bottom_same = top == bottom;
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bool left_and_right_same = left == right;
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if (top_and_bottom_same && left_and_right_same && top == left)
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return top;
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if (top_and_bottom_same && left_and_right_same)
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return StyleValueList::create(StyleValueVector { move(top), move(right) }, StyleValueList::Separator::Space);
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if (left_and_right_same)
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return StyleValueList::create(StyleValueVector { move(top), move(right), move(bottom) }, StyleValueList::Separator::Space);
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return StyleValueList::create(StyleValueVector { move(top), move(right), move(bottom), move(left) }, StyleValueList::Separator::Space);
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}
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enum class LogicalSide {
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BlockStart,
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BlockEnd,
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InlineStart,
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InlineEnd,
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};
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static RefPtr<StyleValue const> style_value_for_length_box_logical_side(Layout::NodeWithStyle const&, LengthBox const& box, LogicalSide logical_side)
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{
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// FIXME: Actually determine the logical sides based on layout_node's writing-mode and direction.
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switch (logical_side) {
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case LogicalSide::BlockStart:
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return style_value_for_length_percentage(box.top());
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case LogicalSide::BlockEnd:
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return style_value_for_length_percentage(box.bottom());
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case LogicalSide::InlineStart:
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return style_value_for_length_percentage(box.left());
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case LogicalSide::InlineEnd:
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return style_value_for_length_percentage(box.right());
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}
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VERIFY_NOT_REACHED();
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}
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static RefPtr<StyleValue const> style_value_for_shadow(Vector<ShadowData> const& shadow_data)
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{
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if (shadow_data.is_empty())
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return IdentifierStyleValue::create(ValueID::None);
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auto make_shadow_style_value = [](ShadowData const& shadow) {
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return ShadowStyleValue::create(
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shadow.color,
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style_value_for_length_percentage(shadow.offset_x),
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style_value_for_length_percentage(shadow.offset_y),
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style_value_for_length_percentage(shadow.blur_radius),
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style_value_for_length_percentage(shadow.spread_distance),
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shadow.placement);
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};
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if (shadow_data.size() == 1)
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return make_shadow_style_value(shadow_data.first());
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StyleValueVector style_values;
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style_values.ensure_capacity(shadow_data.size());
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for (auto& shadow : shadow_data)
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style_values.unchecked_append(make_shadow_style_value(shadow));
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return StyleValueList::create(move(style_values), StyleValueList::Separator::Comma);
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}
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RefPtr<StyleValue const> ResolvedCSSStyleDeclaration::style_value_for_property(Layout::NodeWithStyle const& layout_node, PropertyID property_id) const
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{
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// A limited number of properties have special rules for producing their "resolved value".
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// We also have to manually construct shorthands from their longhands here.
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// Everything else uses the computed value.
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// https://www.w3.org/TR/cssom-1/#resolved-values
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// The resolved value for a given longhand property can be determined as follows:
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switch (property_id) {
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// -> background-color
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// FIXME: -> border-block-end-color
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// FIXME: -> border-block-start-color
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// -> border-bottom-color
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// FIXME: -> border-inline-end-color
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// FIXME: -> border-inline-start-color
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// -> border-left-color
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// -> border-right-color
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// -> border-top-color
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// -> box-shadow
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// FIXME: -> caret-color
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// -> color
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// -> outline-color
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// -> A resolved value special case property like color defined in another specification
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// The resolved value is the used value.
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case PropertyID::BackgroundColor:
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return ColorStyleValue::create(layout_node.computed_values().background_color());
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case PropertyID::BorderBottomColor:
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return ColorStyleValue::create(layout_node.computed_values().border_bottom().color);
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case PropertyID::BorderLeftColor:
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return ColorStyleValue::create(layout_node.computed_values().border_left().color);
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case PropertyID::BorderRightColor:
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return ColorStyleValue::create(layout_node.computed_values().border_right().color);
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case PropertyID::BorderTopColor:
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return ColorStyleValue::create(layout_node.computed_values().border_top().color);
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case PropertyID::BoxShadow:
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return style_value_for_shadow(layout_node.computed_values().box_shadow());
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case PropertyID::Color:
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return ColorStyleValue::create(layout_node.computed_values().color());
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case PropertyID::OutlineColor:
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return ColorStyleValue::create(layout_node.computed_values().outline_color());
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case PropertyID::TextDecorationColor:
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return ColorStyleValue::create(layout_node.computed_values().text_decoration_color());
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// NOTE: text-shadow isn't listed, but is computed the same as box-shadow.
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case PropertyID::TextShadow:
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return style_value_for_shadow(layout_node.computed_values().text_shadow());
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// -> line-height
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// The resolved value is normal if the computed value is normal, or the used value otherwise.
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case PropertyID::LineHeight: {
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auto line_height = static_cast<DOM::Element const&>(*layout_node.dom_node()).computed_css_values()->property(property_id);
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if (line_height->is_identifier() && line_height->to_identifier() == ValueID::Normal)
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return line_height;
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return LengthStyleValue::create(Length::make_px(layout_node.computed_values().line_height()));
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}
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// FIXME: -> block-size
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// -> height
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// FIXME: -> inline-size
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// -> margin-block-end
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// -> margin-block-start
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// -> margin-bottom
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// -> margin-inline-end
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// -> margin-inline-start
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// -> margin-left
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// -> margin-right
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// -> margin-top
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// -> padding-block-end
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// -> padding-block-start
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// -> padding-bottom
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// -> padding-inline-end
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// -> padding-inline-start
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// -> padding-left
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// -> padding-right
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// -> padding-top
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// -> width
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// -> A resolved value special case property like height defined in another specification
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case PropertyID::Height: {
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// If the property applies to the element or pseudo-element and the resolved value of the
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// display property is not none or contents, then the resolved value is the used value.
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// Otherwise the resolved value is the computed value.
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auto const& display = layout_node.computed_values().display();
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if (!display.is_none() && !display.is_contents() && layout_node.paintable()) {
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if (layout_node.paintable()->is_paintable_box()) {
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auto const& paintable_box = static_cast<Painting::PaintableBox const&>(*layout_node.paintable());
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auto const used_height = paintable_box.content_height();
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return style_value_for_size(Size::make_px(used_height));
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}
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dbgln("FIXME: Support getting used height for ({})", layout_node.debug_description());
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}
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return style_value_for_size(layout_node.computed_values().height());
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}
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case PropertyID::MarginBlockEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().margin(), LogicalSide::BlockEnd);
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case PropertyID::MarginBlockStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().margin(), LogicalSide::BlockStart);
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case PropertyID::MarginBottom:
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return style_value_for_length_percentage(layout_node.computed_values().margin().bottom());
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case PropertyID::MarginInlineEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().margin(), LogicalSide::InlineEnd);
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case PropertyID::MarginInlineStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().margin(), LogicalSide::InlineStart);
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case PropertyID::MarginLeft:
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return style_value_for_length_percentage(layout_node.computed_values().margin().left());
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case PropertyID::MarginRight:
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return style_value_for_length_percentage(layout_node.computed_values().margin().right());
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case PropertyID::MarginTop:
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return style_value_for_length_percentage(layout_node.computed_values().margin().top());
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case PropertyID::PaddingBlockEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().padding(), LogicalSide::BlockEnd);
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case PropertyID::PaddingBlockStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().padding(), LogicalSide::BlockStart);
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case PropertyID::PaddingBottom:
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return style_value_for_length_percentage(layout_node.computed_values().padding().bottom());
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case PropertyID::PaddingInlineEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().padding(), LogicalSide::InlineEnd);
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case PropertyID::PaddingInlineStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().padding(), LogicalSide::InlineStart);
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case PropertyID::PaddingLeft:
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return style_value_for_length_percentage(layout_node.computed_values().padding().left());
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case PropertyID::PaddingRight:
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return style_value_for_length_percentage(layout_node.computed_values().padding().right());
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case PropertyID::PaddingTop:
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return style_value_for_length_percentage(layout_node.computed_values().padding().top());
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case PropertyID::Width:
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return style_value_for_size(layout_node.computed_values().width());
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// -> bottom
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// -> left
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// -> inset-block-end
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// -> inset-block-start
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// -> inset-inline-end
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// -> inset-inline-start
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// -> right
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// -> top
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// -> A resolved value special case property like top defined in another specification
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// FIXME: If the property applies to a positioned element and the resolved value of the display property is not
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// none or contents, and the property is not over-constrained, then the resolved value is the used value.
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// Otherwise the resolved value is the computed value.
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case PropertyID::Bottom:
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return style_value_for_length_percentage(layout_node.computed_values().inset().bottom());
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case PropertyID::InsetBlockEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().inset(), LogicalSide::BlockEnd);
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case PropertyID::InsetBlockStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().inset(), LogicalSide::BlockStart);
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case PropertyID::InsetInlineEnd:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().inset(), LogicalSide::InlineEnd);
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case PropertyID::InsetInlineStart:
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return style_value_for_length_box_logical_side(layout_node, layout_node.computed_values().inset(), LogicalSide::InlineStart);
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case PropertyID::Left:
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return style_value_for_length_percentage(layout_node.computed_values().inset().left());
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case PropertyID::Right:
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return style_value_for_length_percentage(layout_node.computed_values().inset().right());
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case PropertyID::Top:
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return style_value_for_length_percentage(layout_node.computed_values().inset().top());
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// -> A resolved value special case property defined in another specification
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// As defined in the relevant specification.
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case PropertyID::Transform: {
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auto transformations = layout_node.computed_values().transformations();
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if (transformations.is_empty())
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return IdentifierStyleValue::create(ValueID::None);
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// https://drafts.csswg.org/css-transforms-2/#serialization-of-the-computed-value
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// The transform property is a resolved value special case property. [CSSOM]
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// When the computed value is a <transform-list>, the resolved value is one <matrix()> function or one <matrix3d()> function computed by the following algorithm:
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// 1. Let transform be a 4x4 matrix initialized to the identity matrix.
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// The elements m11, m22, m33 and m44 of transform must be set to 1; all other elements of transform must be set to 0.
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auto transform = FloatMatrix4x4::identity();
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// 2. Post-multiply all <transform-function>s in <transform-list> to transform.
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VERIFY(layout_node.paintable());
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auto const& paintable_box = verify_cast<Painting::PaintableBox const>(*layout_node.paintable());
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for (auto transformation : transformations) {
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transform = transform * transformation.to_matrix(paintable_box).release_value();
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}
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// https://drafts.csswg.org/css-transforms-1/#2d-matrix
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auto is_2d_matrix = [](Gfx::FloatMatrix4x4 const& matrix) -> bool {
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// A 3x2 transformation matrix,
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// or a 4x4 matrix where the items m31, m32, m13, m23, m43, m14, m24, m34 are equal to 0
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// and m33, m44 are equal to 1.
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// NOTE: We only care about 4x4 matrices here.
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// NOTE: Our elements are 0-indexed not 1-indexed, and in the opposite order.
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if (matrix.elements()[0][2] != 0 // m31
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|| matrix.elements()[1][2] != 0 // m32
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|| matrix.elements()[2][0] != 0 // m13
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|| matrix.elements()[2][1] != 0 // m23
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|| matrix.elements()[2][3] != 0 // m43
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|| matrix.elements()[3][0] != 0 // m14
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|| matrix.elements()[3][1] != 0 // m24
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|| matrix.elements()[3][2] != 0) // m34
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return false;
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if (matrix.elements()[2][2] != 1 // m33
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|| matrix.elements()[3][3] != 1) // m44
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return false;
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return true;
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};
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// 3. Chose between <matrix()> or <matrix3d()> serialization:
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|
// -> If transform is a 2D matrix
|
|
// Serialize transform to a <matrix()> function.
|
|
if (is_2d_matrix(transform)) {
|
|
StyleValueVector parameters {
|
|
NumberStyleValue::create(transform.elements()[0][0]),
|
|
NumberStyleValue::create(transform.elements()[1][0]),
|
|
NumberStyleValue::create(transform.elements()[0][1]),
|
|
NumberStyleValue::create(transform.elements()[1][1]),
|
|
NumberStyleValue::create(transform.elements()[0][3]),
|
|
NumberStyleValue::create(transform.elements()[1][3]),
|
|
};
|
|
return TransformationStyleValue::create(TransformFunction::Matrix, move(parameters));
|
|
}
|
|
// -> Otherwise
|
|
// Serialize transform to a <matrix3d()> function.
|
|
else {
|
|
StyleValueVector parameters {
|
|
NumberStyleValue::create(transform.elements()[0][0]),
|
|
NumberStyleValue::create(transform.elements()[1][0]),
|
|
NumberStyleValue::create(transform.elements()[2][0]),
|
|
NumberStyleValue::create(transform.elements()[3][0]),
|
|
NumberStyleValue::create(transform.elements()[0][1]),
|
|
NumberStyleValue::create(transform.elements()[1][1]),
|
|
NumberStyleValue::create(transform.elements()[2][1]),
|
|
NumberStyleValue::create(transform.elements()[3][1]),
|
|
NumberStyleValue::create(transform.elements()[0][2]),
|
|
NumberStyleValue::create(transform.elements()[1][2]),
|
|
NumberStyleValue::create(transform.elements()[2][2]),
|
|
NumberStyleValue::create(transform.elements()[3][2]),
|
|
NumberStyleValue::create(transform.elements()[0][3]),
|
|
NumberStyleValue::create(transform.elements()[1][3]),
|
|
NumberStyleValue::create(transform.elements()[2][3]),
|
|
NumberStyleValue::create(transform.elements()[3][3]),
|
|
};
|
|
return TransformationStyleValue::create(TransformFunction::Matrix3d, move(parameters));
|
|
}
|
|
}
|
|
|
|
// -> Any other property
|
|
// The resolved value is the computed value.
|
|
// NOTE: This is handled inside the `default` case.
|
|
|
|
// NOTE: Everything below is a shorthand that requires some manual construction.
|
|
case PropertyID::BackgroundPosition:
|
|
return style_value_for_background_property(
|
|
layout_node,
|
|
[](auto& layer) -> NonnullRefPtr<StyleValue> {
|
|
return PositionStyleValue::create(
|
|
EdgeStyleValue::create(layer.position_edge_x, layer.position_offset_x),
|
|
EdgeStyleValue::create(layer.position_edge_y, layer.position_offset_y));
|
|
},
|
|
[]() -> NonnullRefPtr<StyleValue> {
|
|
return PositionStyleValue::create(
|
|
EdgeStyleValue::create(PositionEdge::Left, Percentage(0)),
|
|
EdgeStyleValue::create(PositionEdge::Top, Percentage(0)));
|
|
});
|
|
case PropertyID::Border: {
|
|
auto width = style_value_for_property(layout_node, PropertyID::BorderWidth);
|
|
auto style = style_value_for_property(layout_node, PropertyID::BorderStyle);
|
|
auto color = style_value_for_property(layout_node, PropertyID::BorderColor);
|
|
// `border` only has a reasonable value if all four sides are the same.
|
|
if (width->is_value_list() || style->is_value_list() || color->is_value_list())
|
|
return nullptr;
|
|
return ShorthandStyleValue::create(property_id,
|
|
{ PropertyID::BorderWidth, PropertyID::BorderStyle, PropertyID::BorderColor },
|
|
{ width.release_nonnull(), style.release_nonnull(), color.release_nonnull() });
|
|
}
|
|
case PropertyID::BorderColor: {
|
|
auto top = style_value_for_property(layout_node, PropertyID::BorderTopColor);
|
|
auto right = style_value_for_property(layout_node, PropertyID::BorderRightColor);
|
|
auto bottom = style_value_for_property(layout_node, PropertyID::BorderBottomColor);
|
|
auto left = style_value_for_property(layout_node, PropertyID::BorderLeftColor);
|
|
return style_value_for_sided_shorthand(top.release_nonnull(), right.release_nonnull(), bottom.release_nonnull(), left.release_nonnull());
|
|
}
|
|
case PropertyID::BorderStyle: {
|
|
auto top = style_value_for_property(layout_node, PropertyID::BorderTopStyle);
|
|
auto right = style_value_for_property(layout_node, PropertyID::BorderRightStyle);
|
|
auto bottom = style_value_for_property(layout_node, PropertyID::BorderBottomStyle);
|
|
auto left = style_value_for_property(layout_node, PropertyID::BorderLeftStyle);
|
|
return style_value_for_sided_shorthand(top.release_nonnull(), right.release_nonnull(), bottom.release_nonnull(), left.release_nonnull());
|
|
}
|
|
case PropertyID::BorderWidth: {
|
|
auto top = style_value_for_property(layout_node, PropertyID::BorderTopWidth);
|
|
auto right = style_value_for_property(layout_node, PropertyID::BorderRightWidth);
|
|
auto bottom = style_value_for_property(layout_node, PropertyID::BorderBottomWidth);
|
|
auto left = style_value_for_property(layout_node, PropertyID::BorderLeftWidth);
|
|
return style_value_for_sided_shorthand(top.release_nonnull(), right.release_nonnull(), bottom.release_nonnull(), left.release_nonnull());
|
|
}
|
|
case PropertyID::Margin: {
|
|
auto top = style_value_for_property(layout_node, PropertyID::MarginTop);
|
|
auto right = style_value_for_property(layout_node, PropertyID::MarginRight);
|
|
auto bottom = style_value_for_property(layout_node, PropertyID::MarginBottom);
|
|
auto left = style_value_for_property(layout_node, PropertyID::MarginLeft);
|
|
return style_value_for_sided_shorthand(top.release_nonnull(), right.release_nonnull(), bottom.release_nonnull(), left.release_nonnull());
|
|
}
|
|
case PropertyID::Padding: {
|
|
auto top = style_value_for_property(layout_node, PropertyID::PaddingTop);
|
|
auto right = style_value_for_property(layout_node, PropertyID::PaddingRight);
|
|
auto bottom = style_value_for_property(layout_node, PropertyID::PaddingBottom);
|
|
auto left = style_value_for_property(layout_node, PropertyID::PaddingLeft);
|
|
return style_value_for_sided_shorthand(top.release_nonnull(), right.release_nonnull(), bottom.release_nonnull(), left.release_nonnull());
|
|
}
|
|
case PropertyID::Invalid:
|
|
return IdentifierStyleValue::create(ValueID::Invalid);
|
|
case PropertyID::Custom:
|
|
dbgln_if(LIBWEB_CSS_DEBUG, "Computed style for custom properties was requested (?)");
|
|
return nullptr;
|
|
default:
|
|
if (!property_is_shorthand(property_id))
|
|
return static_cast<DOM::Element const&>(*layout_node.dom_node()).computed_css_values()->property(property_id);
|
|
|
|
// Handle shorthands in a generic way
|
|
auto longhand_ids = longhands_for_shorthand(property_id);
|
|
StyleValueVector longhand_values;
|
|
longhand_values.ensure_capacity(longhand_ids.size());
|
|
for (auto longhand_id : longhand_ids)
|
|
longhand_values.append(style_value_for_property(layout_node, longhand_id).release_nonnull());
|
|
return ShorthandStyleValue::create(property_id, move(longhand_ids), move(longhand_values));
|
|
}
|
|
}
|
|
|
|
Optional<StyleProperty> ResolvedCSSStyleDeclaration::property(PropertyID property_id) const
|
|
{
|
|
// https://www.w3.org/TR/cssom-1/#dom-window-getcomputedstyle
|
|
// NOTE: This is a partial enforcement of step 5 ("If elt is connected, ...")
|
|
if (!m_element->is_connected())
|
|
return {};
|
|
|
|
// FIXME: Be smarter about updating layout if there's no layout node.
|
|
// We may legitimately have no layout node if we're not visible, but this protects against situations
|
|
// where we're requesting the computed style before layout has happened.
|
|
if (!m_element->layout_node() || property_affects_layout(property_id)) {
|
|
const_cast<DOM::Document&>(m_element->document()).update_layout();
|
|
} else {
|
|
// FIXME: If we had a way to update style for a single element, this would be a good place to use it.
|
|
const_cast<DOM::Document&>(m_element->document()).update_style();
|
|
}
|
|
|
|
if (!m_element->layout_node()) {
|
|
auto style = m_element->document().style_computer().compute_style(const_cast<DOM::Element&>(*m_element));
|
|
|
|
// FIXME: This is a stopgap until we implement shorthand -> longhand conversion.
|
|
auto value = style->maybe_null_property(property_id);
|
|
if (!value) {
|
|
dbgln("FIXME: ResolvedCSSStyleDeclaration::property(property_id={:#x}) No value for property ID in newly computed style case.", to_underlying(property_id));
|
|
return {};
|
|
}
|
|
return StyleProperty {
|
|
.property_id = property_id,
|
|
.value = value.release_nonnull(),
|
|
};
|
|
}
|
|
|
|
auto& layout_node = *m_element->layout_node();
|
|
auto value = style_value_for_property(layout_node, property_id);
|
|
if (!value)
|
|
return {};
|
|
return StyleProperty {
|
|
.property_id = property_id,
|
|
.value = value.release_nonnull(),
|
|
};
|
|
}
|
|
|
|
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-setproperty
|
|
WebIDL::ExceptionOr<void> ResolvedCSSStyleDeclaration::set_property(PropertyID, StringView, StringView)
|
|
{
|
|
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
|
|
return WebIDL::NoModificationAllowedError::create(realm(), "Cannot modify properties in result of getComputedStyle()"_fly_string);
|
|
}
|
|
|
|
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-removeproperty
|
|
WebIDL::ExceptionOr<String> ResolvedCSSStyleDeclaration::remove_property(PropertyID)
|
|
{
|
|
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
|
|
return WebIDL::NoModificationAllowedError::create(realm(), "Cannot remove properties from result of getComputedStyle()"_fly_string);
|
|
}
|
|
|
|
String ResolvedCSSStyleDeclaration::serialized() const
|
|
{
|
|
// https://www.w3.org/TR/cssom/#dom-cssstyledeclaration-csstext
|
|
// If the computed flag is set, then return the empty string.
|
|
|
|
// NOTE: ResolvedCSSStyleDeclaration is something you would only get from window.getComputedStyle(),
|
|
// which returns what the spec calls "resolved style". The "computed flag" is always set here.
|
|
return String {};
|
|
}
|
|
|
|
// https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-csstext
|
|
WebIDL::ExceptionOr<void> ResolvedCSSStyleDeclaration::set_css_text(StringView)
|
|
{
|
|
// 1. If the computed flag is set, then throw a NoModificationAllowedError exception.
|
|
return WebIDL::NoModificationAllowedError::create(realm(), "Cannot modify properties in result of getComputedStyle()"_fly_string);
|
|
}
|
|
|
|
}
|