mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Andres Suarez
8bd3edec88
Reviewed By: aaronabramov Differential Revision: D33367752 fbshipit-source-id: 4ce94d184485e5ee0a62cf67ad2d3ba16e285c8f
116 lines
3.3 KiB
C++
116 lines
3.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and 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 <functional>
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#include <memory>
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#include <react/debug/react_native_assert.h>
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#include <react/renderer/core/State.h>
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namespace facebook {
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namespace react {
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/*
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* Concrete and only template implementation of State interface.
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* State wraps an arbitrary data type and provides an interface to initiate a
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* state update transaction. A data object does not need to be copyable but
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* needs to be moveable.
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*/
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template <typename DataT>
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class ConcreteState : public State {
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public:
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using Shared = std::shared_ptr<ConcreteState const>;
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using Data = DataT;
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using SharedData = std::shared_ptr<Data const>;
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/*
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* Creates an updated `State` object with given previous one and `data`.
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*/
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explicit ConcreteState(SharedData const &data, State const &state)
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: State(data, state) {}
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/*
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* Creates a first-of-its-family `State` object with given `family` and
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* `data`.
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*/
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explicit ConcreteState(
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SharedData const &data,
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ShadowNodeFamily::Shared const &family)
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: State(data, family) {}
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virtual ~ConcreteState() = default;
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/*
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* Returns stored data.
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*/
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Data const &getData() const {
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return *std::static_pointer_cast<Data const>(data_);
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}
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/*
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* Initiate a state update process with given new data and priority.
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* This is a simplified convenience version of the method that receives a
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* function for cases where a new value of data does not depend on an old
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* value.
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*/
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void updateState(
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Data &&newData,
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EventPriority priority = EventPriority::AsynchronousUnbatched) const {
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updateState(
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[data{std::move(newData)}](Data const &oldData) -> SharedData {
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return std::make_shared<Data const>(data);
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},
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priority);
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}
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/*
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* Initiate a state update process with a given function (that transforms an
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* old data value to a new one) and priority. The callback function can be
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* called from any thread any moment later.
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* In case of a conflict, the `callback` might be called several times until
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* it succeeded. To cancel the state update operation, the callback needs to
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* return `nullptr`.
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*/
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void updateState(
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std::function<StateData::Shared(Data const &oldData)> callback,
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EventPriority priority = EventPriority::AsynchronousBatched) const {
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auto family = family_.lock();
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if (!family) {
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// No more nodes of this family exist anymore,
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// updating state is impossible.
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return;
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}
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auto stateUpdate = StateUpdate{
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family, [=](StateData::Shared const &oldData) -> StateData::Shared {
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react_native_assert(oldData);
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return callback(*std::static_pointer_cast<Data const>(oldData));
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}};
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family->dispatchRawState(std::move(stateUpdate), priority);
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}
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#ifdef ANDROID
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folly::dynamic getDynamic() const override {
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return getData().getDynamic();
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}
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void updateState(folly::dynamic data) const override {
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updateState(std::move(Data(getData(), data)));
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}
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MapBuffer getMapBuffer() const override {
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return getData().getMapBuffer();
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}
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#endif
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};
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} // namespace react
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} // namespace facebook
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