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05cafdb5d0
`none` isn't a supported value for `<counter-style-name>` and is only
supported directly by `list-style-type` (i.e. not within `counter{s}()`
functions)
112 lines
4.4 KiB
C++
112 lines
4.4 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/Layout/ListItemMarkerBox.h>
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#include <LibWeb/Painting/MarkerPaintable.h>
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namespace Web::Layout {
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GC_DEFINE_ALLOCATOR(ListItemMarkerBox);
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ListItemMarkerBox::ListItemMarkerBox(DOM::Document& document, CSS::ListStyleType style_type, CSS::ListStylePosition style_position, GC::Ref<DOM::Element> list_item_element, GC::Ref<CSS::ComputedProperties> style)
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: Box(document, nullptr, move(style))
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, m_list_style_type(style_type)
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, m_list_style_position(style_position)
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, m_list_item_element(list_item_element)
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{
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}
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ListItemMarkerBox::~ListItemMarkerBox() = default;
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Optional<String> ListItemMarkerBox::text() const
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{
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auto index = m_list_item_element->ordinal_value();
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return m_list_style_type.visit(
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[](Empty const&) -> Optional<String> {
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return {};
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},
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[index](CSS::CounterStyleNameKeyword keyword) -> Optional<String> {
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String text;
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switch (keyword) {
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case CSS::CounterStyleNameKeyword::Square:
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case CSS::CounterStyleNameKeyword::Circle:
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case CSS::CounterStyleNameKeyword::Disc:
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case CSS::CounterStyleNameKeyword::DisclosureClosed:
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case CSS::CounterStyleNameKeyword::DisclosureOpen:
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return {};
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case CSS::CounterStyleNameKeyword::Decimal:
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text = String::number(index);
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break;
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case CSS::CounterStyleNameKeyword::DecimalLeadingZero:
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// This is weird, but in accordance to spec.
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text = index < 10 ? MUST(String::formatted("0{}", index)) : String::number(index);
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break;
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case CSS::CounterStyleNameKeyword::LowerAlpha:
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case CSS::CounterStyleNameKeyword::LowerLatin:
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text = String::bijective_base_from(index - 1, String::Case::Lower);
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break;
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case CSS::CounterStyleNameKeyword::UpperAlpha:
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case CSS::CounterStyleNameKeyword::UpperLatin:
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text = String::bijective_base_from(index - 1, String::Case::Upper);
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break;
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case CSS::CounterStyleNameKeyword::LowerGreek:
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text = String::greek_letter_from(index);
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break;
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case CSS::CounterStyleNameKeyword::LowerRoman:
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text = String::roman_number_from(index, String::Case::Lower);
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break;
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case CSS::CounterStyleNameKeyword::UpperRoman:
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text = String::roman_number_from(index, String::Case::Upper);
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break;
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}
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return MUST(String::formatted("{}. ", text));
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},
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[](String const& string) -> Optional<String> {
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return string;
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});
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}
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GC::Ptr<Painting::Paintable> ListItemMarkerBox::create_paintable() const
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{
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return Painting::MarkerPaintable::create(*this);
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}
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CSSPixels ListItemMarkerBox::relative_size() const
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{
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VERIFY(!m_list_style_type.has<Empty>());
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auto font_size = first_available_font().pixel_size();
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auto marker_text = text();
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if (marker_text.has_value())
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return CSSPixels::nearest_value_for(font_size);
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// https://drafts.csswg.org/css-counter-styles-3/#simple-symbolic
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// NB: The spec allows us to render some predefined symbol counter styles using a UA-generated image instead of
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// text, it instructs us to size these in order to attractively fit within a 1em x 1em square. We mimic Firefox
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// and generally use a size of 0.35em, except for disclosure open/closed styles which use a size of 0.5em.
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static constexpr float marker_image_size_factor = 0.35f;
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static constexpr float disclosure_marker_image_size_factor = 0.5f;
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// Scale the marker box relative to the used font's pixel size.
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switch (m_list_style_type.get<CSS::CounterStyleNameKeyword>()) {
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case CSS::CounterStyleNameKeyword::DisclosureClosed:
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case CSS::CounterStyleNameKeyword::DisclosureOpen:
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return CSSPixels::nearest_value_for(ceilf(font_size * disclosure_marker_image_size_factor));
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default:
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return CSSPixels::nearest_value_for(ceilf(font_size * marker_image_size_factor));
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}
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}
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void ListItemMarkerBox::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_list_item_element);
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}
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}
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