mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
36b586ada1
Summary: Changelog: [Internal] Add support for dynamic font size. New class `ThreadStorage` is introduced, which is used to pass LayoutContext to `YogaLayoutableShadowNode::yogaNodeMeasureCallbackConnector`. ## Shortcoming This implementation doesn't cause re-render, if user changes font size and comes to the app without restarting it, it will show old font size. I believe this is fine for now as most people set their font size before they use the app and keep the same setting for a long time. Reviewed By: shergin Differential Revision: D22043728 fbshipit-source-id: 7453d165c280a2f4bcb73f4ee6daf9e64b637ded
58 lines
1.3 KiB
C++
58 lines
1.3 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 <better/map.h>
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#include <better/optional.h>
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#include <mutex>
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#include <thread>
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namespace facebook {
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namespace react {
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/*
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* ThreadStorage is a class designed to store data for specific thread.
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* When data is inserted from thread 1, it can only be retrieved from thread 1.
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*/
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template <typename DataT>
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class ThreadStorage {
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/*
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* Private default constructor. This class has to be used as a singleton.
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*/
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ThreadStorage() = default;
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public:
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static ThreadStorage<DataT> &getInstance() {
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static ThreadStorage<DataT> threadStorage;
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return threadStorage;
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}
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better::optional<DataT> get() const {
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std::lock_guard<std::mutex> lock(mutex_);
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auto iterator = storage_.find(std::this_thread::get_id());
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if (iterator != storage_.end()) {
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return iterator->second;
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} else {
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return {};
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}
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}
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void set(DataT data) {
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std::lock_guard<std::mutex> lock(mutex_);
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storage_[std::this_thread::get_id()] = data;
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}
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private:
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mutable std::mutex mutex_;
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better::map<std::thread::id, DataT> storage_;
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};
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} // namespace react
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} // namespace facebook
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