92 lines
2.8 KiB
C++
92 lines
2.8 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/components/root/RootShadowNode.h>
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#include <react/renderer/core/ShadowNodeFamily.h>
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#include <react/renderer/graphics/Float.h>
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#include <react/renderer/graphics/Rect.h>
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#include <memory>
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#include "IntersectionObserverState.h"
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namespace facebook::react {
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using IntersectionObserverObserverId = int32_t;
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struct IntersectionObserverEntry {
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IntersectionObserverObserverId intersectionObserverId;
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ShadowNodeFamily::Shared shadowNodeFamily;
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Rect targetRect;
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Rect rootRect;
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Rect intersectionRect;
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bool isIntersectingAboveThresholds;
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HighResTimeStamp time;
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bool sameShadowNodeFamily(
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const ShadowNodeFamily& otherShadowNodeFamily) const {
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return std::addressof(*shadowNodeFamily) ==
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std::addressof(otherShadowNodeFamily);
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}
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};
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class IntersectionObserver {
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public:
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IntersectionObserver(
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IntersectionObserverObserverId intersectionObserverId,
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std::optional<ShadowNodeFamily::Shared> observationRootShadowNodeFamily,
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ShadowNodeFamily::Shared targetShadowNodeFamily,
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std::vector<Float> thresholds,
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std::optional<std::vector<Float>> rootThresholds = std::nullopt);
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// Partially equivalent to
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// https://w3c.github.io/IntersectionObserver/#update-intersection-observations-algo
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std::optional<IntersectionObserverEntry> updateIntersectionObservation(
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const RootShadowNode& rootShadowNode,
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HighResTimeStamp time);
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std::optional<IntersectionObserverEntry>
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updateIntersectionObservationForSurfaceUnmount(HighResTimeStamp time);
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IntersectionObserverObserverId getIntersectionObserverId() const {
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return intersectionObserverId_;
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}
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ShadowNodeFamily::Shared getTargetShadowNodeFamily() const {
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return targetShadowNodeFamily_;
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}
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std::vector<Float> getThresholds() const {
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return thresholds_;
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}
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private:
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std::optional<IntersectionObserverEntry> setIntersectingState(
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const Rect& rootBoundingRect,
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const Rect& targetBoundingRect,
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const Rect& intersectionRect,
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Float threshold,
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Float rootThreshold,
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HighResTimeStamp time);
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std::optional<IntersectionObserverEntry> setNotIntersectingState(
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const Rect& rootBoundingRect,
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const Rect& targetBoundingRect,
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const Rect& intersectionRect,
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HighResTimeStamp time);
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IntersectionObserverObserverId intersectionObserverId_;
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std::optional<ShadowNodeFamily::Shared> observationRootShadowNodeFamily_;
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ShadowNodeFamily::Shared targetShadowNodeFamily_;
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std::vector<Float> thresholds_;
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std::optional<std::vector<Float>> rootThresholds_;
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mutable IntersectionObserverState state_ =
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IntersectionObserverState::Initial();
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};
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} // namespace facebook::react
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