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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/BoxExtents.h>
#include <WebCore/StylePrimitiveNumericTypes.h>
#include <WebCore/StyleValueTypes.h>
namespace WebCore {
class LayoutRect;
class LayoutUnit;
namespace Style {
// <'scroll-margin-*'> = <length>
// https://drafts.csswg.org/css-scroll-snap-1/#margin-longhands-physical
struct ScrollMarginEdge {
using Fixed = Length<>;
ScrollMarginEdge(Fixed&& fixed) : m_value(fixed) { }
ScrollMarginEdge(const Fixed& fixed) : m_value(fixed) { }
ScrollMarginEdge(CSS::ValueLiteral<CSS::LengthUnit::Px> literal) : m_value(literal) { }
ALWAYS_INLINE bool isZero() const { return m_value.isZero(); }
ALWAYS_INLINE bool isPositive() const { return m_value.isPositive(); }
ALWAYS_INLINE bool isNegative() const { return m_value.isNegative(); }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
return visitor(m_value);
}
bool operator==(const ScrollMarginEdge&) const = default;
private:
friend struct Evaluation<ScrollMarginEdge, LayoutUnit>;
friend struct Evaluation<ScrollMarginEdge, float>;
Length<> m_value;
};
// <'scroll-margin'> = <length>{1,4}
// https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin
using ScrollMarginBox = MinimallySerializingSpaceSeparatedRectEdges<ScrollMarginEdge>;
// MARK: - Conversion
template<> struct CSSValueConversion<ScrollMarginEdge> { auto operator()(BuilderState&, const CSSValue&) -> ScrollMarginEdge; };
// MARK: - Evaluation
template<> struct Evaluation<ScrollMarginEdge, LayoutUnit> {
auto operator()(const ScrollMarginEdge&, LayoutUnit referenceLength, ZoomNeeded) -> LayoutUnit;
auto operator()(const ScrollMarginEdge&, ZoomNeeded) -> LayoutUnit;
};
template<> struct Evaluation<ScrollMarginEdge, float> {
auto operator()(const ScrollMarginEdge&, float referenceLength, ZoomNeeded) -> float;
auto operator()(const ScrollMarginEdge&, ZoomNeeded) -> float;
};
// MARK: - Extent
LayoutBoxExtent extentForRect(const ScrollMarginBox&, const LayoutRect&);
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::ScrollMarginEdge)
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