88 строки
2.2 KiB
C++
88 строки
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/imagemanager/ImageResponse.h>
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#include <react/imagemanager/ImageResponseObserver.h>
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#include <react/imagemanager/ImageResponseObserverCoordinator.h>
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#include <react/imagemanager/primitives.h>
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namespace facebook {
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namespace react {
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/*
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* Represents ongoing request for an image resource.
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* The separate object must be constructed for every single separate
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* image request. The object cannot be copied because it would make managing of
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* event listeners hard and inefficient; the object can be moved though.
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* Destroy to cancel the underlying request.
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*/
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class ImageRequest final {
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public:
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/*
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* The default constructor
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*/
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ImageRequest(const ImageSource &imageSource);
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/*
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* The move constructor.
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*/
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ImageRequest(ImageRequest &&other) noexcept;
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/*
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* `ImageRequest` does not support copying by design.
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*/
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ImageRequest(const ImageRequest &other) = delete;
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~ImageRequest();
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/**
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* Set cancelation function.
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*/
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void setCancelationFunction(std::function<void(void)> cancelationFunction);
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/*
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* Returns stored observer coordinator as a shared pointer.
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* Retain this *or* `ImageRequest` to ensure a correct lifetime of the object.
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*/
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const std::shared_ptr<const ImageResponseObserverCoordinator>
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&getSharedObserverCoordinator() const;
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/*
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* Returns stored observer coordinator as a reference.
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* Use this if a correct lifetime of the object is ensured in some other way
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* (e.g. by retaining an `ImageRequest`).
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*/
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const ImageResponseObserverCoordinator &getObserverCoordinator() const;
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private:
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/*
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* Image source assosiated with the request.
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*/
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ImageSource imageSource_;
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/*
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* Event coordinator associated with the reqest.
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*/
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std::shared_ptr<const ImageResponseObserverCoordinator> coordinator_{};
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/*
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* Function we can call to cancel image request (see destructor).
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*/
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std::function<void(void)> cancelRequest_;
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/*
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* Indicates that the object was moved and hence cannot be used anymore.
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*/
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bool moved_{false};
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};
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} // namespace react
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} // namespace facebook
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