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16e3a86393
There were a mix of users between those who want to know if the Length changed, and those that just want an absolute Length. So, we now have two methods: Length::absolutize() returns an empty Optional if nothing changed, and Length::absolutized() always returns a value.
212 lines
6.6 KiB
C++
212 lines
6.6 KiB
C++
/*
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* Copyright (c) 2020, 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/NonnullOwnPtr.h>
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#include <AK/Variant.h>
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#include <LibGfx/Font/Font.h>
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#include <LibGfx/Rect.h>
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#include <LibWeb/CSS/Length.h>
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#include <LibWeb/CSS/Percentage.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/BrowsingContext.h>
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#include <LibWeb/HTML/HTMLHtmlElement.h>
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namespace Web::CSS {
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Length::Length(int value, Type type)
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: m_type(type)
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, m_value(value)
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{
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}
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Length::Length(float value, Type type)
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: m_type(type)
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, m_value(value)
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{
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}
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Length::~Length() = default;
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Length Length::make_auto()
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{
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return Length(0, Type::Auto);
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}
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Length Length::make_px(CSSPixels value)
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{
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return Length(value.value(), Type::Px);
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}
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Length Length::percentage_of(Percentage const& percentage) const
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{
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if (is_auto()) {
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dbgln("Attempting to get percentage of an auto length, this seems wrong? But for now we just return the original length.");
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return *this;
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}
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return Length { percentage.as_fraction() * raw_value(), m_type };
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}
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Length Length::resolved(Layout::Node const& layout_node) const
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{
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if (is_relative())
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return make_px(to_px(layout_node));
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if (!isfinite(m_value))
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return make_auto();
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return *this;
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}
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CSSPixels Length::relative_length_to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
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{
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switch (m_type) {
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case Type::Ex:
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return m_value * font_metrics.x_height;
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case Type::Em:
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return m_value * font_size;
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case Type::Ch:
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// FIXME: Use layout_node.font().pixel_size() when writing-mode is not horizontal-tb (it has to be implemented first)
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return m_value * (font_metrics.advance_of_ascii_zero + font_metrics.glyph_spacing);
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case Type::Rem:
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return m_value * root_font_size;
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case Type::Vw:
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return viewport_rect.width() * (m_value / 100);
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case Type::Vh:
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return viewport_rect.height() * (m_value / 100);
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case Type::Vmin:
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return min(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
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case Type::Vmax:
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return max(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
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case Type::Lh:
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return m_value * line_height;
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case Type::Rlh:
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return m_value * root_line_height;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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CSSPixels Length::to_px(Layout::Node const& layout_node) const
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{
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if (is_absolute())
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return absolute_length_to_px();
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if (!layout_node.document().browsing_context())
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return 0;
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auto const& viewport_rect = layout_node.document().browsing_context()->viewport_rect();
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auto* root_element = layout_node.document().document_element();
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if (!root_element || !root_element->layout_node())
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return 0;
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return to_px(viewport_rect, layout_node.font().pixel_metrics(), layout_node.computed_values().font_size(), root_element->layout_node()->computed_values().font_size(), layout_node.line_height(), root_element->layout_node()->line_height());
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}
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ErrorOr<String> Length::to_string() const
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{
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if (is_auto())
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return "auto"_string;
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return String::formatted("{}{}", m_value, unit_name());
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}
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char const* Length::unit_name() const
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{
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switch (m_type) {
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case Type::Cm:
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return "cm";
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case Type::In:
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return "in";
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case Type::Px:
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return "px";
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case Type::Pt:
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return "pt";
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case Type::Mm:
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return "mm";
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case Type::Q:
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return "Q";
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case Type::Pc:
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return "pc";
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case Type::Ex:
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return "ex";
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case Type::Em:
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return "em";
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case Type::Ch:
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return "ch";
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case Type::Rem:
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return "rem";
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case Type::Auto:
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return "auto";
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case Type::Vh:
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return "vh";
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case Type::Vw:
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return "vw";
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case Type::Vmax:
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return "vmax";
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case Type::Vmin:
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return "vmin";
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case Type::Lh:
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return "lh";
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case Type::Rlh:
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return "rlh";
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}
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VERIFY_NOT_REACHED();
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}
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Optional<Length::Type> Length::unit_from_name(StringView name)
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{
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if (name.equals_ignoring_ascii_case("px"sv)) {
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return Length::Type::Px;
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} else if (name.equals_ignoring_ascii_case("pt"sv)) {
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return Length::Type::Pt;
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} else if (name.equals_ignoring_ascii_case("pc"sv)) {
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return Length::Type::Pc;
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} else if (name.equals_ignoring_ascii_case("mm"sv)) {
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return Length::Type::Mm;
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} else if (name.equals_ignoring_ascii_case("rem"sv)) {
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return Length::Type::Rem;
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} else if (name.equals_ignoring_ascii_case("em"sv)) {
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return Length::Type::Em;
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} else if (name.equals_ignoring_ascii_case("ex"sv)) {
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return Length::Type::Ex;
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} else if (name.equals_ignoring_ascii_case("ch"sv)) {
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return Length::Type::Ch;
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} else if (name.equals_ignoring_ascii_case("vw"sv)) {
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return Length::Type::Vw;
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} else if (name.equals_ignoring_ascii_case("vh"sv)) {
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return Length::Type::Vh;
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} else if (name.equals_ignoring_ascii_case("vmax"sv)) {
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return Length::Type::Vmax;
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} else if (name.equals_ignoring_ascii_case("vmin"sv)) {
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return Length::Type::Vmin;
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} else if (name.equals_ignoring_ascii_case("cm"sv)) {
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return Length::Type::Cm;
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} else if (name.equals_ignoring_ascii_case("in"sv)) {
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return Length::Type::In;
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} else if (name.equals_ignoring_ascii_case("Q"sv)) {
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return Length::Type::Q;
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} else if (name.equals_ignoring_ascii_case("lh"sv)) {
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return Length::Type::Lh;
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} else if (name.equals_ignoring_ascii_case("rlh"sv)) {
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return Length::Type::Rlh;
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}
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return {};
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}
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Optional<Length> Length::absolutize(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
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{
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if (is_px())
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return {};
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if (is_absolute() || is_relative()) {
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auto px = to_px(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height);
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return CSS::Length::make_px(px);
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}
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return {};
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}
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Length Length::absolutized(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size, CSSPixels line_height, CSSPixels root_line_height) const
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{
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return absolutize(viewport_rect, font_metrics, font_size, root_font_size, line_height, root_line_height).value_or(*this);
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}
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}
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