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67a79010ca
Summary: @public Previously, all ConcreteShadowNode subclasses had to override `getComponentName()` function to specialize a name of the component. And often it was all that those subclasses do. Now, it's a template argument; and many ShadowNode classes can be created as oneliners via *just* specializing ConcreteShadowNode template. Unfortunately, C++ does not allow to use `std::string`s or string literals as template arguments, but it allows to use pointers. Moreover, those pointers must point to some linked data, hence, those values must be declared in .cpp (not .h) files. For simplicity, we put those constants in Props classes, (but this is not a strong requirement). Reviewed By: mdvacca Differential Revision: D8942826 fbshipit-source-id: 4fd517e2485eb8f8c20a51df9b3496941856d8a5
54 lines
1.1 KiB
C++
54 lines
1.1 KiB
C++
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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 <fabric/components/root/RootProps.h>
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#include <fabric/components/view/ConcreteViewShadowNode.h>
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#include <fabric/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<
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RootComponentName,
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RootProps
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> {
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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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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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