74 строки
2.4 KiB
C++
74 строки
2.4 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 <react/core/ComponentDescriptor.h>
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#include <react/core/EventDispatcher.h>
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#include <react/utils/ContextContainer.h>
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namespace facebook {
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namespace react {
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/*
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* Callable signature that represents the signature of `ComponentDescriptor`
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* constructor. The callable returns a unique pointer conveniently represents an
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* abstract type and ownership of the newly created object.
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*/
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using ComponentDescriptorConstructor = ComponentDescriptor::Unique(
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ComponentDescriptorParameters const ¶meters);
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/*
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* Represents a unified way to construct an instance of a particular stored
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* `ComponentDescriptor` class. C++ does not allow to create pointers to
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* constructors, so we have to have such data structure to manipulate a
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* collection of classes.
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*
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* Note: The actual values of `handle` and `name` for some components depend on
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* `flavor`. The provider is valid if instantiated by `constructor` object with
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* given `flavor` exposes the same values of `handle` and `name`.
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*/
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class ComponentDescriptorProvider final {
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public:
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ComponentHandle handle;
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ComponentName name;
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ComponentDescriptor::Flavor flavor;
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ComponentDescriptorConstructor *constructor;
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};
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/*
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* Creates a `ComponentDescriptor` for given `ComponentDescriptorParameters`.
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*/
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template <typename ComponentDescriptorT>
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ComponentDescriptor::Unique concreteComponentDescriptorConstructor(
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ComponentDescriptorParameters const ¶meters) {
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static_assert(
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std::is_base_of<ComponentDescriptor, ComponentDescriptorT>::value,
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"ComponentDescriptorT must be a descendant of ComponentDescriptor");
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return std::make_unique<ComponentDescriptorT const>(parameters);
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}
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/*
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* Creates a `ComponentDescriptorProvider` for given `ComponentDescriptor`
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* class.
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*/
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template <typename ComponentDescriptorT>
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ComponentDescriptorProvider concreteComponentDescriptorProvider() {
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static_assert(
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std::is_base_of<ComponentDescriptor, ComponentDescriptorT>::value,
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"ComponentDescriptorT must be a descendant of ComponentDescriptor");
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return {ComponentDescriptorT::ConcreteShadowNode::Handle(),
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ComponentDescriptorT::ConcreteShadowNode::Name(),
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nullptr,
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&concreteComponentDescriptorConstructor<ComponentDescriptorT>};
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}
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} // namespace react
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} // namespace facebook
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