mirror of
https://github.com/zhigang1992/react-native.git
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af1808de69
Summary: The previous implementation of the method cloned the root node twice (one time at the very end of the method and one time at the end of loop body). The new one does it once and a bit more readable. Reviewed By: mdvacca Differential Revision: D14187969 fbshipit-source-id: 9859deadd4b041ac115c37108188aab70200c75d
72 lines
2.1 KiB
C++
72 lines
2.1 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 "RootShadowNode.h"
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#include <react/components/view/conversions.h>
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#include <react/debug/SystraceSection.h>
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namespace facebook {
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namespace react {
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const char RootComponentName[] = "RootView";
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void RootShadowNode::layout() {
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SystraceSection s("RootShadowNode::layout");
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ensureUnsealed();
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layout(getProps()->layoutContext);
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// This is the rare place where shadow node must layout (set `layoutMetrics`)
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// itself because there is no a parent node which usually should do it.
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setLayoutMetrics(layoutMetricsFromYogaNode(yogaNode_));
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}
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UnsharedRootShadowNode RootShadowNode::clone(
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const LayoutConstraints &layoutConstraints,
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const LayoutContext &layoutContext) const {
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auto props = std::make_shared<const RootProps>(
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*getProps(), layoutConstraints, layoutContext);
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auto newRootShadowNode = std::make_shared<RootShadowNode>(
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*this, ShadowNodeFragment{.props = props});
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return newRootShadowNode;
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}
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UnsharedRootShadowNode RootShadowNode::clone(
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const SharedShadowNode &oldShadowNode,
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const SharedShadowNode &newShadowNode) const {
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std::vector<std::reference_wrapper<const ShadowNode>> ancestors;
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if (!oldShadowNode->constructAncestorPath(*this, ancestors)) {
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return UnsharedRootShadowNode{nullptr};
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}
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auto oldChild = oldShadowNode;
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auto newChild = newShadowNode;
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for (const auto &ancestor : ancestors) {
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auto oldParent = ancestor.get().shared_from_this();
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auto children = oldParent->getChildren();
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std::replace(children.begin(), children.end(), oldChild, newChild);
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auto sharedChildren = std::make_shared<SharedShadowNodeList>(children);
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auto newParent =
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oldParent->clone(ShadowNodeFragment{.children = sharedChildren});
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newParent->replaceChild(oldChild, newChild);
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oldChild = oldParent;
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newChild = newParent;
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}
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return std::const_pointer_cast<RootShadowNode>(
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std::static_pointer_cast<const RootShadowNode>(newChild));
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}
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} // namespace react
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} // namespace facebook
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