57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <react/renderer/graphics/Float.h>
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#include <optional>
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namespace {
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enum class IntersectionObserverStateType {
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Initial,
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NotIntersecting,
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Intersecting,
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};
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}
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namespace facebook::react {
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class IntersectionObserverState {
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public:
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static IntersectionObserverState Initial();
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static IntersectionObserverState NotIntersecting();
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static IntersectionObserverState Intersecting(Float threshold);
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static IntersectionObserverState Intersecting(
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Float threshold,
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Float rootThreshold);
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bool isIntersecting() const;
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bool operator==(const IntersectionObserverState& other) const;
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bool operator!=(const IntersectionObserverState& other) const;
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private:
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explicit IntersectionObserverState(IntersectionObserverStateType state);
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IntersectionObserverState(
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IntersectionObserverStateType state,
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Float threshold,
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Float rootThreshold);
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IntersectionObserverStateType state_;
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// This value is only relevant if the state is
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// IntersectionObserverStateType::Intersecting.
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Float threshold_{};
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// This value is only relevant if the state is
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// IntersectionObserverStateType::Intersecting.
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std::optional<Float> rootThreshold_{};
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};
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} // namespace facebook::react
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