34 lines
1.3 KiB
C
34 lines
1.3 KiB
C
|
/*
|
||
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
||
|
|
*
|
||
|
|
* This source code is licensed under the MIT license found in the
|
||
|
|
* LICENSE file in the root directory of this source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <react/core/ShadowNode.h>
|
||
|
|
#include <react/core/ShadowNodeFragment.h>
|
||
|
|
|
||
|
|
namespace facebook {
|
||
|
|
namespace react {
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Problem Description: because of C++ State, the React Native C++ ShadowTree
|
||
|
|
* can diverge from the ReactJS ShadowTree; ReactJS communicates all tree
|
||
|
|
* changes to C++, but C++ state commits are not propagated to ReactJS (ReactJS
|
||
|
|
* may or may not clone nodes with state changes, but it has no way of knowing
|
||
|
|
* if it /should/ clone those nodes; so those clones may never happen). This
|
||
|
|
* causes a number of problems. This function resolves the problem by taking a
|
||
|
|
* candidate tree being committed, and sees if any State changes need to be
|
||
|
|
* applied to it. If any changes need to be made, a new ShadowNode is returned;
|
||
|
|
* otherwise, nullptr is returned if the node is already consistent with the
|
||
|
|
* latest tree, including all state changes.
|
||
|
|
*
|
||
|
|
* This should be called during the commit phase, pre-layout and pre-diff.
|
||
|
|
*/
|
||
|
|
UnsharedShadowNode reconcileStateWithTree(
|
||
|
|
ShadowNode const *newNode,
|
||
|
|
SharedShadowNode committedNode);
|
||
|
|
|
||
|
|
} // namespace react
|
||
|
|
} // namespace facebook
|