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/*
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <WebCore/StylePositionAreaSpan.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
class WritingMode;
enum class BoxAxis : uint8_t;
enum class ItemPosition : uint8_t;
enum class LogicalBoxAxis : uint8_t;
namespace Style {
// <'position-area'> = none | <position-area>
// https://drafts.csswg.org/css-anchor-position-1/#propdef-position-area
// A non-`none` position-area is formed by two spans of opposite axes, that uniquely determine
// the area of the containing block.
struct PositionAreaValue {
PositionAreaValue(PositionAreaSpan blockOrXAxis, PositionAreaSpan inlineOrYAxis);
constexpr PositionAreaSpan blockOrXAxis() const { return m_blockOrXAxis; }
constexpr PositionAreaSpan inlineOrYAxis() const { return m_inlineOrYAxis; }
PositionAreaSpan spanForAxis(BoxAxis physicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const;
PositionAreaSpan spanForAxis(LogicalBoxAxis logicalAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const;
// Start/end based on container's coordinate-increasing direction (RenderBox coordinates)
PositionAreaTrack coordMatchedTrackForAxis(BoxAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const;
ItemPosition defaultAlignmentForAxis(BoxAxis, WritingMode containerWritingMode, WritingMode selfWritingMode) const;
constexpr bool operator==(const PositionAreaValue&) const = default;
private:
PositionAreaSpan m_blockOrXAxis;
PositionAreaSpan m_inlineOrYAxis;
};
struct PositionArea {
PositionArea(CSS::Keyword::None) : m_value { } { }
PositionArea(PositionAreaValue value) : m_value { value } { }
bool isNone() const { return !m_value; }
bool isValue() const { return !!m_value; }
std::optional<PositionAreaValue> tryValue() const { return m_value; }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
if (isNone())
return visitor(CSS::Keyword::None { });
return visitor(*m_value);
}
bool operator==(const PositionArea&) const = default;
private:
std::optional<PositionAreaValue> m_value;
};
// MARK: - Conversion
template<> struct CSSValueConversion<PositionArea> { auto operator()(BuilderState&, const CSSValue&) -> PositionArea; };
template<> struct CSSValueCreation<PositionAreaValue> { Ref<CSSValue> operator()(CSSValuePool&, const RenderStyle&, const PositionAreaValue&); };
// MARK: - Serialization
template<> struct Serialize<PositionAreaValue> { void operator()(StringBuilder&, const CSS::SerializationContext&, const RenderStyle&, const PositionAreaValue&); };
// MARK: - Logging
WTF::TextStream& operator<<(WTF::TextStream&, PositionAreaValue);
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::PositionArea)
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