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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/NonnullOwnPtr.h>
#include <AK/Variant.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/Rect.h>
#include <LibWeb/CSS/Length.h>
#include <LibWeb/CSS/Percentage.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/BrowsingContext.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
namespace Web::CSS {
Length::Length(int value, Type type)
: m_type(type)
, m_value(value)
{
}
Length::Length(float value, Type type)
: m_type(type)
, m_value(value)
{
}
Length::~Length() = default;
Length Length::make_auto()
{
return Length(0, Type::Auto);
}
Length Length::make_px(CSSPixels value)
{
return Length(value.value(), Type::Px);
}
Length Length::make_calculated(NonnullRefPtr<CalculatedStyleValue> calculated_style_value)
{
Length length { 0, Type::Calculated };
length.m_calculated_style = move(calculated_style_value);
return length;
}
Length Length::percentage_of(Percentage const& percentage) const
{
VERIFY(!is_calculated());
if (is_auto()) {
dbgln("Attempting to get percentage of an auto length, this seems wrong? But for now we just return the original length.");
return *this;
}
return Length { percentage.as_fraction() * raw_value(), m_type };
}
Length Length::resolved(Layout::Node const& layout_node) const
{
if (is_calculated())
return m_calculated_style->resolve_length(layout_node).release_value();
if (is_relative())
return make_px(to_px(layout_node));
if (!isfinite(m_value))
return make_auto();
return *this;
}
CSSPixels Length::relative_length_to_px(CSSPixelRect const& viewport_rect, Gfx::FontPixelMetrics const& font_metrics, CSSPixels font_size, CSSPixels root_font_size) const
{
switch (m_type) {
case Type::Ex:
return m_value * font_metrics.x_height;
case Type::Em:
return m_value * font_size;
case Type::Ch:
// FIXME: Use layout_node.font().pixel_size() when writing-mode is not horizontal-tb (it has to be implemented first)
return m_value * (font_metrics.advance_of_ascii_zero + font_metrics.glyph_spacing);
case Type::Rem:
return m_value * root_font_size;
case Type::Vw:
return viewport_rect.width() * (m_value / 100);
case Type::Vh:
return viewport_rect.height() * (m_value / 100);
case Type::Vmin:
return min(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
case Type::Vmax:
return max(viewport_rect.width(), viewport_rect.height()) * (m_value / 100);
default:
VERIFY_NOT_REACHED();
}
}
CSSPixels Length::to_px(Layout::Node const& layout_node) const
{
if (is_calculated())
return m_calculated_style->resolve_length(layout_node)->to_px(layout_node);
if (is_absolute())
return absolute_length_to_px();
if (!layout_node.document().browsing_context())
return 0;
auto const& viewport_rect = layout_node.document().browsing_context()->viewport_rect();
auto* root_element = layout_node.document().document_element();
if (!root_element || !root_element->layout_node())
return 0;
return to_px(viewport_rect, layout_node.font().pixel_metrics(), layout_node.computed_values().font_size(), root_element->layout_node()->computed_values().font_size());
}
ErrorOr<String> Length::to_string() const
{
if (is_calculated())
return m_calculated_style->to_string();
if (is_auto())
return "auto"_string;
return String::formatted("{}{}", m_value, unit_name());
}
char const* Length::unit_name() const
{
switch (m_type) {
case Type::Cm:
return "cm";
case Type::In:
return "in";
case Type::Px:
return "px";
case Type::Pt:
return "pt";
case Type::Mm:
return "mm";
case Type::Q:
return "Q";
case Type::Pc:
return "pc";
case Type::Ex:
return "ex";
case Type::Em:
return "em";
case Type::Ch:
return "ch";
case Type::Rem:
return "rem";
case Type::Auto:
return "auto";
case Type::Vh:
return "vh";
case Type::Vw:
return "vw";
case Type::Vmax:
return "vmax";
case Type::Vmin:
return "vmin";
case Type::Calculated:
return "calculated";
}
VERIFY_NOT_REACHED();
}
Optional<Length::Type> Length::unit_from_name(StringView name)
{
if (name.equals_ignoring_case("px"sv)) {
return Length::Type::Px;
} else if (name.equals_ignoring_case("pt"sv)) {
return Length::Type::Pt;
} else if (name.equals_ignoring_case("pc"sv)) {
return Length::Type::Pc;
} else if (name.equals_ignoring_case("mm"sv)) {
return Length::Type::Mm;
} else if (name.equals_ignoring_case("rem"sv)) {
return Length::Type::Rem;
} else if (name.equals_ignoring_case("em"sv)) {
return Length::Type::Em;
} else if (name.equals_ignoring_case("ex"sv)) {
return Length::Type::Ex;
} else if (name.equals_ignoring_case("ch"sv)) {
return Length::Type::Ch;
} else if (name.equals_ignoring_case("vw"sv)) {
return Length::Type::Vw;
} else if (name.equals_ignoring_case("vh"sv)) {
return Length::Type::Vh;
} else if (name.equals_ignoring_case("vmax"sv)) {
return Length::Type::Vmax;
} else if (name.equals_ignoring_case("vmin"sv)) {
return Length::Type::Vmin;
} else if (name.equals_ignoring_case("cm"sv)) {
return Length::Type::Cm;
} else if (name.equals_ignoring_case("in"sv)) {
return Length::Type::In;
} else if (name.equals_ignoring_case("Q"sv)) {
return Length::Type::Q;
}
return {};
}
NonnullRefPtr<CalculatedStyleValue> Length::calculated_style_value() const
{
VERIFY(!m_calculated_style.is_null());
return *m_calculated_style;
}
bool Length::operator==(Length const& other) const
{
if (is_calculated())
return m_calculated_style == other.m_calculated_style;
return m_type == other.m_type && m_value == other.m_value;
}
}
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