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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
* 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. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 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/StyleValueTypes.h>
namespace WebCore {
namespace Style {
// <'scrollbar-gutter'> = auto | stable && both-edges?
// https://www.w3.org/TR/css-overflow-3/#propdef-scrollbar-gutter
struct ScrollbarGutter {
constexpr ScrollbarGutter(CSS::Keyword::Auto)
: m_type { Type::Auto }
{
}
constexpr ScrollbarGutter(CSS::Keyword::Stable)
: m_type { Type::Stable }
{
}
constexpr ScrollbarGutter(CSS::Keyword::Stable, CSS::Keyword::BothEdges)
: m_type { Type::StableBothEdges }
{
}
constexpr bool isAuto() const { return m_type == Type::Auto; }
constexpr bool isStable() const { return m_type == Type::Stable; }
constexpr bool isStableBothEdges() const { return m_type == Type::StableBothEdges; }
template<typename... F> decltype(auto) switchOn(F&&... f) const
{
auto visitor = WTF::makeVisitor(std::forward<F>(f)...);
switch (m_type) {
case Type::Auto:
return visitor(CSS::Keyword::Auto { });
case Type::Stable:
return visitor(CSS::Keyword::Stable { });
case Type::StableBothEdges:
return visitor(SpaceSeparatedTuple { CSS::Keyword::Stable { }, CSS::Keyword::BothEdges { } });
}
RELEASE_ASSERT_NOT_REACHED();
}
constexpr bool operator==(const ScrollbarGutter&) const = default;
private:
enum Type : uint8_t { Auto, Stable, StableBothEdges };
Type m_type;
};
// MARK: - Conversion
template<> struct CSSValueConversion<ScrollbarGutter> { auto operator()(BuilderState&, const CSSValue&) -> ScrollbarGutter; };
} // namespace Style
} // namespace WebCore
DEFINE_VARIANT_LIKE_CONFORMANCE(WebCore::Style::ScrollbarGutter)
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