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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 "BoxExtents.h"
#include "CSSPrimitiveNumericUnits.h"
#include "Length.h"
#include "StyleValueTypes.h"
namespace WebCore {
class CSSValue;
class LayoutRect;
class LayoutUnit;
class RenderStyle;
namespace Style {
class BuilderState;
// <'scroll-padding-*'> = auto | <length-percentage [0,∞]>
// https://drafts.csswg.org/css-scroll-snap-1/#padding-longhands-physical
struct ScrollPaddingEdge {
ScrollPaddingEdge(WebCore::Length&& value)
: m_value { WTFMove(value) }
{
RELEASE_ASSERT(m_value.isSpecified());
}
ScrollPaddingEdge(CSS::Keyword::Auto)
: m_value { WebCore::LengthType::Auto }
{
}
ScrollPaddingEdge(CSS::ValueLiteral<CSS::LengthUnit::Px> pixels)
: m_value { pixels.value, WebCore::LengthType::Fixed }
{
}
ScrollPaddingEdge(CSS::ValueLiteral<CSS::PercentageUnit::Percentage> percentage)
: m_value { percentage.value, WebCore::LengthType::Percent }
{
}
LayoutUnit evaluate(LayoutUnit referenceLength) const;
float evaluate(float referenceLength) const;
Ref<CSSValue> toCSS(const RenderStyle&) const;
bool isZero() const { return m_value.isZero(); }
bool operator==(const ScrollPaddingEdge&) const = default;
private:
WebCore::Length m_value;
};
// <'scroll-padding'> = [ auto | <length-percentage [0,∞]> ]{1,4}
// https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-padding
struct ScrollPadding : SpaceSeparatedRectEdges<ScrollPaddingEdge> {
using Wrapped = SpaceSeparatedRectEdges<ScrollPaddingEdge>;
using Wrapped::Wrapped;
using Wrapped::operator=;
template<size_t I> friend const auto& get(const ScrollPadding& self)
{
return get<I>(static_cast<const Wrapped&>(self));
}
bool operator==(const ScrollPadding&) const = default;
};
// MARK: - Conversion
ScrollPaddingEdge scrollPaddingEdgeFromCSSValue(const CSSValue&, BuilderState&);
// MARK: - Evaluation
template<> struct Evaluation<ScrollPaddingEdge> {
template<typename T> auto operator()(const ScrollPaddingEdge& edge, T referenceLength) -> T
{
return edge.evaluate(referenceLength);
}
};
// MARK: - Extent
LayoutBoxExtent extentForRect(const ScrollPadding&, const LayoutRect&);
} // namespace Style
} // namespace WebCore
DEFINE_TUPLE_LIKE_CONFORMANCE(WebCore::Style::ScrollPadding, 4)
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