mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
b0273bbe70
Summary: `stubViewTreeFromShadowNode` was implemented without using `calculateShadowViewMutations` (aka Diffing algorithm). The problem is that we use `stubViewTreeFromShadowNode` to test the diffing, so it was not fully correct to use the algorithm to test itself. Reviewed By: JoshuaGross Differential Revision: D16342526 fbshipit-source-id: 2674245ed5ec71309fe5d362779a33d8dd31dc7b
64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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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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#include "stubs.h"
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#include <react/core/LayoutableShadowNode.h>
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#include <react/core/ShadowNodeFragment.h>
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#include <react/mounting/Differentiator.h>
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namespace facebook {
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namespace react {
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/*
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* Generates `create` and `insert` instructions recursively traversing a shadow
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* tree.
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* This is a trivial implementation of diffing algorithm that can only "diff"
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* an empty tree with some other one.
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*/
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static void calculateShadowViewMutationsForNewTree(
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ShadowViewMutation::List &mutations,
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ShadowView const &parentShadowView,
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ShadowViewNodePair::List const &newChildPairs) {
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for (auto index = 0; index < newChildPairs.size(); index++) {
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auto const &newChildPair = newChildPairs[index];
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mutations.push_back(
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ShadowViewMutation::CreateMutation(newChildPair.shadowView));
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mutations.push_back(ShadowViewMutation::InsertMutation(
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parentShadowView, newChildPair.shadowView, index));
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auto const newGrandChildPairs =
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sliceChildShadowNodeViewPairs(*newChildPair.shadowNode);
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calculateShadowViewMutationsForNewTree(
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mutations, newChildPair.shadowView, newGrandChildPairs);
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}
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}
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StubViewTree stubViewTreeFromShadowNode(ShadowNode const &rootShadowNode) {
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auto mutations = ShadowViewMutation::List{};
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mutations.reserve(256);
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calculateShadowViewMutationsForNewTree(
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mutations,
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ShadowView(rootShadowNode),
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sliceChildShadowNodeViewPairs(rootShadowNode));
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auto emptyRootShadowNode = rootShadowNode.clone(
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ShadowNodeFragment{ShadowNodeFragment::tagPlaceholder(),
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ShadowNodeFragment::surfaceIdPlaceholder(),
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ShadowNodeFragment::propsPlaceholder(),
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ShadowNodeFragment::eventEmitterPlaceholder(),
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ShadowNode::emptySharedShadowNodeSharedList()});
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auto stubViewTree = StubViewTree(ShadowView(*emptyRootShadowNode));
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stubViewTree.mutate(mutations);
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return stubViewTree;
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}
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} // namespace react
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} // namespace facebook
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