55 lines
1.7 KiB
C++
55 lines
1.7 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/consistency/ShadowTreeRevisionConsistencyManager.h>
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#include <react/renderer/mounting/ShadowTreeRegistry.h>
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#include <react/renderer/uimanager/consistency/ShadowTreeRevisionProvider.h>
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#include <cstdint>
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#include <memory>
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#include <shared_mutex>
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namespace facebook::react {
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/**
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* This class implements UI consistency for the JavaScript thread.
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* This implementation forces JavaScript to see a stable revision of the shadow
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* tree for a given surface ID, only updating it when React commits a new tree
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* or between JS tasks.
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*/
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class LazyShadowTreeRevisionConsistencyManager
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: public ShadowTreeRevisionConsistencyManager,
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public ShadowTreeRevisionProvider {
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public:
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explicit LazyShadowTreeRevisionConsistencyManager(
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ShadowTreeRegistry& shadowTreeRegistry);
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void updateCurrentRevision(
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SurfaceId surfaceId,
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RootShadowNode::Shared rootShadowNode);
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#pragma mark - ShadowTreeRevisionProvider
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RootShadowNode::Shared getCurrentRevision(SurfaceId surfaceId) override;
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#pragma mark - ShadowTreeRevisionConsistencyManager
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void lockRevisions() override;
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void unlockRevisions() override;
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private:
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std::mutex capturedRootShadowNodesForConsistencyMutex_;
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std::unordered_map<SurfaceId, RootShadowNode::Shared>
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capturedRootShadowNodesForConsistency_;
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ShadowTreeRegistry& shadowTreeRegistry_;
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uint_fast32_t lockCount{0};
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};
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} // namespace facebook::react
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