92 строки
2.1 KiB
C++
92 строки
2.1 KiB
C++
/**
|
|
* Copyright (c) Facebook, Inc. and its affiliates.
|
|
*
|
|
* This source code is licensed under the MIT license found in the
|
|
* LICENSE file in the root directory of this source tree.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <react/imagemanager/ImageResponse.h>
|
|
#include <react/imagemanager/ImageResponseObserver.h>
|
|
|
|
#include <folly/SharedMutex.h>
|
|
#include <shared_mutex>
|
|
#include <vector>
|
|
|
|
namespace facebook {
|
|
namespace react {
|
|
|
|
/*
|
|
* The ImageResponseObserverCoordinator receives events and completed image
|
|
* data from native image loaders and sends events to any observers attached
|
|
* to the coordinator. The Coordinator also keeps track of response status
|
|
* and caches completed images.
|
|
*/
|
|
class ImageResponseObserverCoordinator {
|
|
public:
|
|
/*
|
|
* Default constructor.
|
|
*/
|
|
ImageResponseObserverCoordinator();
|
|
|
|
/*
|
|
* Default destructor.
|
|
*/
|
|
~ImageResponseObserverCoordinator();
|
|
|
|
/*
|
|
* Interested parties may observe the image response.
|
|
*/
|
|
void addObserver(ImageResponseObserver *observer) const;
|
|
|
|
/*
|
|
* Interested parties may stop observing the image response.
|
|
*/
|
|
void removeObserver(ImageResponseObserver *observer) const;
|
|
|
|
/*
|
|
* Platform-specific image loader will call this method with progress updates.
|
|
*/
|
|
void nativeImageResponseProgress(float) const;
|
|
|
|
/*
|
|
* Platform-specific image loader will call this method with a completed image
|
|
* response.
|
|
*/
|
|
void nativeImageResponseComplete(const ImageResponse &imageResponse) const;
|
|
|
|
/*
|
|
* Platform-specific image loader will call this method in case of any
|
|
* failures.
|
|
*/
|
|
void nativeImageResponseFailed() const;
|
|
|
|
private:
|
|
/*
|
|
* List of observers.
|
|
* Mutable: protected by mutex_.
|
|
*/
|
|
mutable std::vector<ImageResponseObserver *> observers_;
|
|
|
|
/*
|
|
* Current status of image loading.
|
|
* Mutable: protected by mutex_.
|
|
*/
|
|
mutable ImageResponse::Status status_;
|
|
|
|
/*
|
|
* Cache image data.
|
|
* Mutable: protected by mutex_.
|
|
*/
|
|
mutable std::shared_ptr<void> imageData_{};
|
|
|
|
/*
|
|
* Observer and data mutex.
|
|
*/
|
|
mutable folly::SharedMutex mutex_;
|
|
};
|
|
|
|
} // namespace react
|
|
} // namespace facebook
|