105 lines
3.4 KiB
C++
105 lines
3.4 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/core/ShadowNode.h>
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#include <react/renderer/graphics/Float.h>
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#include <react/renderer/runtimescheduler/RuntimeScheduler.h>
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#include <react/renderer/runtimescheduler/RuntimeSchedulerIntersectionObserverDelegate.h>
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#include <react/renderer/uimanager/UIManager.h>
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#include <react/renderer/uimanager/UIManagerMountHook.h>
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#include <memory>
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#include <vector>
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#include "IntersectionObserver.h"
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namespace facebook::react {
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class IntersectionObserverManager final
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: public UIManagerMountHook,
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public RuntimeSchedulerIntersectionObserverDelegate {
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public:
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IntersectionObserverManager();
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void observe(
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IntersectionObserverObserverId intersectionObserverId,
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const std::optional<ShadowNodeFamily::Shared>& observationRootShadowNode,
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const ShadowNodeFamily::Shared& shadowNode,
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std::vector<Float> thresholds,
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std::optional<std::vector<Float>> rootThresholds,
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const UIManager& uiManager);
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void unobserve(
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IntersectionObserverObserverId intersectionObserverId,
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const ShadowNodeFamily::Shared& shadowNode);
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void connect(
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RuntimeScheduler& runtimeScheduler,
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UIManager& uiManager,
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std::function<void()> notifyIntersectionObserversCallback);
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void disconnect(RuntimeScheduler& runtimeScheduler, UIManager& uiManager);
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std::vector<IntersectionObserverEntry> takeRecords();
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#pragma mark - RuntimeSchedulerIntersectionObserverDelegate
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void updateIntersectionObservations(
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const std::unordered_set<SurfaceId>&
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surfaceIdsWithPendingRenderingUpdates) override;
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#pragma mark - UIManagerMountHook
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void shadowTreeDidMount(
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const RootShadowNode::Shared& rootShadowNode,
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HighResTimeStamp time) noexcept override;
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void shadowTreeDidUnmount(SurfaceId surfaceId, HighResTimeStamp time) noexcept
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override;
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private:
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mutable std::unordered_map<
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SurfaceId,
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std::vector<std::unique_ptr<IntersectionObserver>>>
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observersBySurfaceId_;
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mutable std::shared_mutex observersMutex_;
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// This is defined as a list of pointers to keep the ownership of the
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// observers in the map.
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std::vector<IntersectionObserver*> observersPendingInitialization_;
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// This is only accessed from the JS thread at the end of the event loop tick,
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// so it is safe to retain it as a raw pointer.
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// We need to retain it here because the RuntimeScheduler does not provide
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// it when calling `updateIntersectionObservations`.
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const ShadowTreeRegistry* shadowTreeRegistry_{nullptr};
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mutable std::function<void()> notifyIntersectionObserversCallback_;
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mutable std::vector<IntersectionObserverEntry> pendingEntries_;
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mutable std::mutex pendingEntriesMutex_;
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mutable bool notifiedIntersectionObservers_{};
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mutable bool mountHookRegistered_{};
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void notifyObserversIfNecessary();
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void notifyObservers();
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// Equivalent to
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// https://w3c.github.io/IntersectionObserver/#update-intersection-observations-algo
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void updateIntersectionObservations(
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SurfaceId surfaceId,
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const RootShadowNode* rootShadowNode,
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HighResTimeStamp time);
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const IntersectionObserver& getRegisteredIntersectionObserver(
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SurfaceId surfaceId,
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IntersectionObserverObserverId observerId) const;
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};
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} // namespace facebook::react
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