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https://github.com/facebook/react-native.git
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Joshua Gross
27981ad991
Summary: This implements proposal #2 in our State architecture doc: https://fb.quip.com/bm2EAVwL7jQ5 Problem description: see the text in the comment of TreeStateReconciliation.h Solution: see also comments in TreeStateReconciliation.h. Changelog: [internal] Reviewed By: mdvacca Differential Revision: D19617329 fbshipit-source-id: 845fb5fe27f2591be433b6d77799707b3516fb1a
34 lines
1.3 KiB
C++
34 lines
1.3 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its 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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#include <react/core/ShadowNode.h>
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#include <react/core/ShadowNodeFragment.h>
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namespace facebook {
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namespace react {
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/**
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* Problem Description: because of C++ State, the React Native C++ ShadowTree
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* can diverge from the ReactJS ShadowTree; ReactJS communicates all tree
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* changes to C++, but C++ state commits are not propagated to ReactJS (ReactJS
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* may or may not clone nodes with state changes, but it has no way of knowing
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* if it /should/ clone those nodes; so those clones may never happen). This
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* causes a number of problems. This function resolves the problem by taking a
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* candidate tree being committed, and sees if any State changes need to be
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* applied to it. If any changes need to be made, a new ShadowNode is returned;
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* otherwise, nullptr is returned if the node is already consistent with the
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* latest tree, including all state changes.
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*
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* This should be called during the commit phase, pre-layout and pre-diff.
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*/
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UnsharedShadowNode reconcileStateWithTree(
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ShadowNode const *newNode,
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SharedShadowNode committedNode);
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} // namespace react
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} // namespace facebook
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