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https://github.com/zhigang1992/react-native.git
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84cf657308
Summary: Removing additional complexity from ShadowTree should help with maintainability. Now, this class is "tricky", but short at least. With new `commit` API, it's much more simple and expected this way. Reviewed By: sahrens Differential Revision: D13615365 fbshipit-source-id: 1fe851c1a2d3bdc7ac2f4a570cf0170eae3c4c67
65 lines
1.7 KiB
C++
65 lines
1.7 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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#pragma once
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#include <memory>
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#include <react/components/root/RootProps.h>
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#include <react/components/view/ConcreteViewShadowNode.h>
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#include <react/core/LayoutContext.h>
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namespace facebook {
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namespace react {
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class RootShadowNode;
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using SharedRootShadowNode = std::shared_ptr<const RootShadowNode>;
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using UnsharedRootShadowNode = std::shared_ptr<RootShadowNode>;
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extern const char RootComponentName[];
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/*
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* `ShadowNode` for the root component.
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* Besides all functionality of the `View` component, `RootShadowNode` contains
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* props which represent external layout constraints and context of the
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* shadow tree.
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*/
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class RootShadowNode final
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: public ConcreteViewShadowNode<RootComponentName, RootProps> {
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public:
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using ConcreteViewShadowNode::ConcreteViewShadowNode;
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/*
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* Layouts the shadow tree.
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*/
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void layout();
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/*
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* Clones the node with given `layoutConstraints` and `layoutContext`.
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*/
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UnsharedRootShadowNode clone(
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const LayoutConstraints &layoutConstraints,
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const LayoutContext &layoutContext) const;
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/*
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* Clones the node replacing a given old shadow node with a new one in the
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* tree by cloning all nodes on the path to the root node and then complete
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* the tree. Returns `nullptr` if the operation cannot be finished
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* successfully.
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*/
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UnsharedRootShadowNode clone(
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const SharedShadowNode &oldShadowNode,
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const SharedShadowNode &newShadowNode) const;
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private:
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using YogaLayoutableShadowNode::layout;
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};
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} // namespace react
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} // namespace facebook
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