mirror of
https://github.com/facebook/react-native.git
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Paige Sun
acda299453
Reviewed By: fkgozali Differential Revision: D23450649 fbshipit-source-id: 58265a2c7855a2f4371d68637f09a07921821adf
90 lines
2.2 KiB
C++
90 lines
2.2 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/renderer/imagemanager/ImageResponse.h>
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#include <react/renderer/imagemanager/ImageResponseObserver.h>
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#include <better/small_vector.h>
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#include <mutex>
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#include <vector>
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namespace facebook {
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namespace react {
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/*
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* The ImageResponseObserverCoordinator receives events and completed image
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* data from native image loaders and sends events to any observers attached
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* to the coordinator. The Coordinator also keeps track of response status
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* and caches completed images.
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*/
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class ImageResponseObserverCoordinator {
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public:
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/*
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* Interested parties may observe the image response.
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* If the current image request status is not equal to `Loading`, the observer
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* will be called immediately.
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*/
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void addObserver(ImageResponseObserver const &observer) const;
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/*
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* Interested parties may stop observing the image response.
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*/
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void removeObserver(ImageResponseObserver const &observer) const;
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/*
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* Platform-specific image loader will call this method with progress updates.
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*/
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void nativeImageResponseProgress(float progress) const;
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/*
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* Platform-specific image loader will call this method with a completed image
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* response.
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*/
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void nativeImageResponseComplete(ImageResponse const &imageResponse) const;
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/*
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* Platform-specific image loader will call this method in case of any
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* failures.
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*/
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void nativeImageResponseFailed() const;
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private:
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/*
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* List of observers.
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* Mutable: protected by mutex_.
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*/
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mutable better::small_vector<ImageResponseObserver const *, 1> observers_;
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/*
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* Current status of image loading.
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* Mutable: protected by mutex_.
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*/
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mutable ImageResponse::Status status_{ImageResponse::Status::Loading};
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/*
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* Cache image data.
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* Mutable: protected by mutex_.
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*/
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mutable std::shared_ptr<void> imageData_;
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/*
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* Cache image metadata.
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* Mutable: protected by mutex_.
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*/
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mutable std::shared_ptr<void> imageMetadata_;
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/*
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* Observer and data mutex.
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*/
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mutable std::mutex mutex_;
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};
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} // namespace react
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} // namespace facebook
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