mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Valentin Shergin
6a10feacda
Summary: Storing a strong shared pointer to `ComponentDescriptor` can cause a memory leak. Therefore we enforce all call sides and params to be weak pointers. The only Scheduler preserves a retaining pointer to it (to prevent preliminary deallocation). Reviewed By: sammy-SC Differential Revision: D17115540 fbshipit-source-id: fdea7d19f742ff04d5ba5470dd9748a5b226aa7c
62 lines
2.0 KiB
C++
62 lines
2.0 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/components/slider/SliderMeasurementsManager.h>
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#include <react/components/slider/SliderShadowNode.h>
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#include <react/core/ConcreteComponentDescriptor.h>
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namespace facebook {
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namespace react {
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/*
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* Descriptor for <Slider> component.
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*/
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class SliderComponentDescriptor final
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: public ConcreteComponentDescriptor<SliderShadowNode> {
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public:
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SliderComponentDescriptor(
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EventDispatcher::Weak eventDispatcher,
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ContextContainer::Shared const &contextContainer)
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: ConcreteComponentDescriptor(eventDispatcher),
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imageManager_(std::make_shared<ImageManager>(contextContainer)),
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measurementsManager_(
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SliderMeasurementsManager::shouldMeasureSlider()
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? std::make_shared<SliderMeasurementsManager>(contextContainer)
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: nullptr) {}
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void adopt(UnsharedShadowNode shadowNode) const override {
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ConcreteComponentDescriptor::adopt(shadowNode);
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assert(std::dynamic_pointer_cast<SliderShadowNode>(shadowNode));
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auto sliderShadowNode =
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std::static_pointer_cast<SliderShadowNode>(shadowNode);
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// `SliderShadowNode` uses `ImageManager` to initiate image loading and
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// communicate the loading state and results to mounting layer.
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sliderShadowNode->setImageManager(imageManager_);
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if (measurementsManager_) {
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// `SliderShadowNode` uses `SliderMeasurementsManager` to
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// provide measurements to Yoga.
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sliderShadowNode->setSliderMeasurementsManager(measurementsManager_);
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// All `SliderShadowNode`s must have leaf Yoga nodes with properly
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// setup measure function.
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sliderShadowNode->enableMeasurement();
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}
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}
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private:
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const SharedImageManager imageManager_;
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const std::shared_ptr<SliderMeasurementsManager> measurementsManager_;
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};
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} // namespace react
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} // namespace facebook
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